Title of the invention: Battery module with improved stacking method of battery cells and battery pack including same
technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0113871 on September 07, 2020, and all contents disclosed in the literature of the Korean patent application are incorporated as a part of this specification.
[2]
The present invention relates to a battery module having an improved stacking method of battery cells and a battery pack including the same.
[3]
background
[4]
Recently, a rechargeable battery capable of charging and discharging has been widely used as an energy source for a wireless mobile device. In addition, secondary batteries are attracting attention as a power source for electric vehicles (EVs) and hybrid electric vehicles (HEVs), which are proposed as a solution to air pollution, such as conventional gasoline and diesel vehicles using fossil fuels. .
[5]
While one or two or three battery cells are used per device in small mobile devices, medium-to-large-sized battery modules electrically connecting a plurality of battery cells are used in mid-to-large devices such as automobiles due to the need for high output and large capacity.
[6]
Since it is preferable that the mid- to large-sized battery module be manufactured as small as possible in size and weight, it can be charged with a high degree of integration, and a prismatic battery, a pouch-type battery, and the like, which have a small weight to capacity, are mainly used as battery cells of the medium and large-sized battery module. In particular, a pouch-type battery cell using an aluminum laminate sheet or the like as an exterior member has recently attracted a lot of attention due to advantages such as a small weight and low manufacturing cost.
[7]
On the other hand, in order to provide the required output and the required amount of a predetermined device or device requiring a medium or large-sized battery module, a plurality of battery cells should be electrically connected in series, and a stable structure against external force should be maintained.
[8]
FIG. 1 is a diagram showing the structure of a conventional battery module, and FIG. 2 is a diagram schematically showing a structure in which battery cells are stacked in a partial area (area A) of the battery module of FIG. 1 . 1 to 2 , the conventional battery module 10 includes a cell stack in which n battery cells 12 are stacked inside a case 11 . The battery module 10 forms one battery pack by connecting several to tens of each other.
[9]
On the other hand, an increase in the volume of the battery pack causes an increase in the volume of an external device to which the battery pack is applied, thereby causing design restrictions. In particular, when the battery pack is applied as a large-capacity secondary battery for driving a motor for an electric cleaner, electric scooter, or automobile (electric vehicle or hybrid vehicle), the need to minimize the volume of the battery pack because the installation space of the battery pack is narrow There is this.
[10]
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[11]
In order to solve the problems of the prior art, the present invention is to provide a battery module having an improved stacking method of battery cells capable of increasing the space utilization rate of the battery module and the battery pack, and a battery pack including the same.
[12]
means of solving the problem
[13]
The present invention provides a battery module in which the stacking method of battery cells is improved. In one embodiment, the battery module according to the present invention includes a tray having a battery cell accommodating portion formed therein; a first cell assembly accommodated in the battery cell accommodating part of the tray, the plurality of battery cells being electrically connected to each other and arranged in a single layer; and a second cell assembly accommodated in the battery cell accommodating part of the tray, the plurality of battery cells being electrically connected to each other and arranged in a single layer. In this case, the battery cell includes a cell body, first and second electrode leads protruding in both directions about the cell body, and first and second electrode leads respectively connected to the first and second electrode leads and the cell body. It is a structure with a terrace.
[14]
In a specific example, one surface of the first cell assembly has a structure in which a plurality of first accommodating grooves formed in a space in which first electrode leads and second electrode leads of neighboring battery cells are connected are formed, and the first assembly The cell body of the battery cell of the second cell assembly is accommodated in each of the first receiving grooves, and the cell body of the battery cell included in each of the first and second cell assemblies is arranged on the same layer. In addition, the battery module according to the present invention may have a structure in which a heat insulating pad and a cooling pad are disposed between the first and second assemblies.
[15]
In one embodiment, in the battery module according to the present invention, a plurality of second accommodating grooves formed in a space where the first electrode leads and the second electrode leads of neighboring battery cells are connected are formed on one surface of the second cell assembly. is a structure that becomes In this case, each second receiving groove of the second assembly has a structure in which the cell body of the battery cell of the first assembly is accommodated.
[16]
In one embodiment, the battery cell has a structure in which a cell body length in a region in which the first and second electrode leads protrude is longer than a cell body length in a region in which the first and second electrode leads do not protrude.
[17]
In another embodiment, one side of the battery cell may have a structure in which an area in which the cell body is formed is convexly protruded. In addition, the other side surface of the battery cell may have a flat structure.
[18]
In one embodiment, the battery module according to the present invention includes m first cell assemblies (m is an integer greater than or equal to 2) arranged in the same layer as each other. At this time, each first receiving groove of the j-th (j is an integer greater than or equal to 1 and less than or equal to n-1) first cell assembly is arranged on the same axis as each first receiving groove of the j+1-th first cell assembly. have a structure
[19]
In another embodiment, the battery module according to the present invention includes n second cell assemblies (n is an integer greater than or equal to 2) arranged on the same layer as each other. At this time, each second receiving groove of the k-th (k is an integer greater than or equal to 1 and less than or equal to m-1) second cell assembly is arranged on the same axis as each second receiving groove of the k+1-th second cell assembly. have a structure
[20]
In one embodiment, the thermal insulation pad of the battery module according to the present invention is disposed between the first and second cell assemblies. In a specific example, the heat insulation pad is disposed in a region in contact with the first and second terraces of the battery cells included in the first and second cell assemblies. Alternatively, the heat insulating pad is disposed in a region in contact with the first and second terraces and the first and second electrode leads.
[21]
In another embodiment, the cooling pad of the battery module according to the present invention is disposed between the first and second cell assemblies. In a specific example, the cooling pad is disposed in a region in contact with a cell body of a battery cell included in the first and second cell assemblies.
[22]
Meanwhile, the battery module according to the present invention has a structure in which a plurality of battery cells included in each of the first and second cell assemblies are electrically connected in series to each other.
[23]
In another example, the battery module according to the present invention has a structure in which the cell bodies of the battery cells included in the first and second cell assemblies are arranged on the same layer. In addition, the first and second cell assemblies may have a structure in which a plurality of layers are stacked.
[24]
[25]
Furthermore, the present invention provides a battery pack including the battery module described above.
[26]
Effects of the Invention
[27]
According to the battery module and the battery pack including the improved battery cell stacking method of the present invention, a first cell assembly and a second cell assembly in which a plurality of battery cells are connected in a single layer are stacked alternately with each other to form a battery module and a battery pack. It has the effect of increasing the space utilization rate.
[28]
Brief description of the drawing
[29]
1 is a view showing the structure of a conventional battery module.
[30]
FIG. 2 is a view schematically showing a structure in which battery cells are stacked in a partial area (A) of the battery module of FIG. 1 .
[31]
3 is a schematic diagram of a battery module and a cross-sectional view (A-A') of the battery module according to an embodiment of the present invention.
[32]
4 is a view schematically showing a cell assembly of a battery module according to an embodiment of the present invention.
[33]
5 is a view showing in detail a cross-sectional view of a battery module and a configuration of a battery cell according to another embodiment of the present invention.
[34]
6 is a view showing an assembly process of a battery module according to another embodiment of the present invention.
[35]
7 is a view schematically showing a battery module in which a heat insulating pad is disposed in the assembly process of the battery module according to another embodiment of the present invention.
[36]
8 is a schematic view of a battery module and a cross-sectional view (A-A') of the battery module according to another embodiment of the present invention.
[37]
9 is a view showing an assembly process of a battery module according to another embodiment of the present invention.
[38]
10 is a schematic diagram of a battery module according to another embodiment of the present invention.
[39]
Best mode for carrying out the invention
[40]
Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.
[41]
In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof. Further, when a part of a layer, film, region, plate, etc. is said to be “on” another part, this includes not only the case where the other part is “directly on” but also the case where there is another part in between. Conversely, when a part of a layer, film, region, plate, etc. is said to be “under” another part, this includes not only cases where it is “directly under” another part, but also cases where another part is in between. In addition, in the present application, “on” may include the case of being disposed not only on the upper part but also on the lower part.
[42]
[43]
The present invention provides an improved battery cell stacking method.It relates to a module and a battery pack including the same.
[44]
According to the battery module and the battery pack including the improved battery cell stacking method of the present invention, a first cell assembly and a second cell assembly in which a plurality of battery cells are connected in a single layer are stacked alternately with each other to form a battery module and a battery pack. It has the effect of increasing the space utilization rate.
[45]
[46]
Hereinafter, a battery module in which the stacking method of the battery cells of the present invention is improved and a battery pack including the same will be described in detail.
[47]
In one embodiment, a battery module with an improved stacking method of battery cells according to the present invention includes: a tray having a battery cell accommodating part formed therein; a first cell assembly accommodated in the battery cell accommodating part of the tray, the plurality of battery cells being electrically connected to each other and arranged in a single layer; and a second cell assembly accommodated in the battery cell accommodating part of the tray, the plurality of battery cells being electrically connected to each other and arranged in a single layer.
[48]
In this case, the battery cell includes a cell body, first and second electrode leads protruding in both directions about the cell body, and first and second electrode leads respectively connected to the first and second electrode leads and the cell body. It is a structure with a terrace. The battery cell may have a structure in which first and second terraces are formed widely on both sides, respectively, and first and second electrode leads are exposed from the first and second terraces, respectively. Specifically, the area of ​​each terrace may be 5 times or more of the area of ​​the exposed electrode lead. For example, the area of ​​each terrace may be 5 to 20 times, 7 to 15 times, or about 10 times the area of ​​the exposed electrode leads. The battery cell according to the present invention can minimize the exposure of the electrode lead, which has a risk of short circuit, by forming a wide terrace area, and can secure a buffer area when gas is generated inside the cell body.
[49]
In one example, in the battery module according to the present invention, a plurality of first accommodating grooves formed in a space where the first electrode leads and the second electrode leads of neighboring battery cells are connected are formed on one surface of the first cell assembly. is a structure that becomes Meanwhile, the cell bodies of the battery cells of the second cell assembly are accommodated in each of the first receiving grooves of the first assembly, so that the cell bodies of the battery cells included in each of the first and second cell assemblies are arranged on the same layer. is a structure that becomes
[50]
In addition, a heat insulating pad and a cooling pad may be disposed between the first and second assemblies.
[51]
In a specific example, the battery module according to the present invention includes a first cell assembly and a second cell assembly in which a plurality of battery cells are connected in a single layer. And, it has a structure in which a second cell assembly is stacked on one surface of the first cell assembly. In this case, the battery cells constituting the first cell assembly and the battery cells constituting the second cell assembly are alternately arranged. This means that the cell body of the battery cell constituting the first cell assembly and the cell body of the battery cell constituting the second cell assembly are alternately arranged. Accordingly, the cell bodies of the battery cells included in the first and second cell assemblies may be arranged on the same layer, and the space utilization rate of the battery module may be increased by the structure of the battery module.
[52]
[53]
In the present invention, a tray is a case for accommodating battery cells and has a structure in which a battery cell accommodating part is formed therein. In one embodiment, the housing may have an open surface, and may include a cover that covers one surface of the housing. In addition, the tray may be made of a material of a case typically used for accommodating battery cells, and may be made of an insulating material.
[54]
A plurality of battery cells are electrically connected to the inside of the tray, and first and second cell assemblies each arranged in a single layer are accommodated. On the other hand, the cell assembly arranged in a single layer is accommodated in the tray, not the conventional battery cell stack, and it is preferable to have an appropriate width and length.
[55]
In addition, the battery cell is not particularly limited as long as it is a rechargeable battery capable of charging and discharging. In a specific example, the battery cell is a pouch-type unit cell, and an electrode assembly having a positive electrode/separator/negative electrode structure is embedded in a laminate sheet exterior material in a state in which it is connected to electrode leads formed outside of the exterior material. The electrode leads are drawn out of the sheet and may extend in the same direction or opposite directions. However, in the present invention, in order to electrically connect a plurality of battery cells to each other, it is preferable that a pair of electrode leads extend in opposite directions.
[56]
In the present invention, the battery cell includes a cell body, first and second electrode leads protruding in both directions with respect to the cell body, and first and second terraces in regions where each of the first and second electrode leads and the cell body are connected. has a formed structure.
[57]
The cell body is a region including an electrode assembly having a cathode/separator/cathode structure, and the first and second terraces refer to regions in which the first and second electrode leads and the cell body are connected, respectively. Here, the terrace refers to a space in the internal structure of the battery cell except for the electrode assembly in which the electrode plate and the semi-layer film are stacked. That is, the first and second terraces may refer to regions in which each of the first and second electrode leads and the cell body are connected.
[58]
[59]
In one embodiment, the battery cell has a structure in which a cell body length in a region in which the first and second electrode leads protrude is longer than a cell body length in a region in which the first and second electrode leads do not protrude.
[60]
In a specific example, the battery cell has a structure in which the width (W) is longer than the length (L) of the cell body. That is, in the present invention, the battery cell means that the distance between the first electrode lead and the second electrode lead is closer than that of a conventional battery cell.
[61]
In this case, when the current flows from the first electrode lead to the second electrode lead of the battery cell, the distance through which the current flows until the current flowing in from the first electrode lead is transferred to the second electrode lead is shortened. Accordingly, the internal resistance of the battery cell may be reduced.
[62]
[63]
In another embodiment, the battery cell has a structure in which a region in which the cell body is formed is convexly protruded. More specifically, one side of the battery cell has a structure in which an area in which the cell body is formed is convexly protruded, and the other side of the battery cell has a flat structure. Here, the flat structure means that the bottom of the battery cell is flat, and the first and second electrode leads and the bottom surfaces of the first and second terraces are located on the same line as the bottom surface of the cell body.
[64]
In particular, when the second cell assembly is stacked on the first cell assembly, the convexly protruding regions of the battery cells are stacked to face each other. In this case, the convexly protruding area of ​​the battery cell in the first cell assembly is disposed in the second receiving groove of the second cell assembly, and the convexly protruding area of ​​the battery cell in the second cell assembly is the first of the first cell assembly. placed in the receiving groove.
[65]
Meanwhile, in the second cell assembly, a region opposite to the convexly protruding region of the battery cell has a flat structure. That is, the other side of the second cell assembly has a flat structure. Accordingly, the battery module of the present invention can increase the space utilization rate.
[66]
In addition, each of the first and second cell assemblies may have a structure in which a plurality of battery cells are electrically connected to each other in series, and each cell assembly includes a terminal for electrically connecting the first and second cell assemblies to each other. It may include, or may include a terminal that can be electrically connected to an external power.
[67]
[68]
In one embodiment, the first cell assembly according to the present invention has a structure in which a plurality of battery cells are electrically connected to each other and arranged in a single layer. The number of battery cells included in the first cell assembly may be 2 to 30, 2 to 20, 2 to 15, or 2 to 10. In this case, the battery cells included in the first cell assembly are electrically connected to neighboring battery cells. In a specific example, the first electrode lead of one battery cell is disposed to be in contact with the second electrode lead of the neighboring battery cell, so that the neighboring battery cells are electrically connected to each other. For example, the first electrode lead of one battery cell may be connected to each other by welding with the second electrode lead of a neighboring battery cell, or the first electrode lead of one battery cell may be connected to the neighboring battery cell through an adhesive member such as a tape. may be electrically connected to the second electrode lead of the battery cell.
[69]
In one embodiment, the first cell assembly includes a plurality of first receiving grooves. The first accommodating groove is a space in which cell bodies of battery cells constituting the second cell assembly are disposed when the second cell assembly is stacked on top of the first cell assembly. space is formed.
[70]
In a specific example, in the first cell assembly, the second electrode lead of the firstly arranged battery cell is arranged to be in contact with the first electrode lead of the second arranged battery cell. In this case, the cell body of the battery cell has a structure in which one side protrudes convexly, so that the first and second terraces, which are areas in which the cell body is not formed, and the areas in which the first and second electrode leads are formed, are compared to the cell body. It may have a structure in which a concave groove is formed. That is, in the first cell assembly, a relatively concave groove is formed between adjacent cell bodies. This structure is also the same for the second cell assembly. Here, in the first cell assembly, the concave groove becomes a first accommodating groove, and in the second assembly, the concave groove becomes a second accommodating groove.
[71]
And, when the second cell assembly is stacked on the upper surface of the first cell assembly, the cell body of the battery cell included in the second cell assembly is disposed in the first accommodating groove, and the first cell assembly is disposed in the second accommodating groove. The cell body of the battery cell included in the is arranged. Meanwhile, when the second cell assembly is stacked on the upper surface of the first cell assembly, the cell body of the battery cell included in the first cell assembly and the cell body of the battery cell included in the second cell assembly face each other. are stacked In addition, the number of battery cells included in the second cell assembly is 2 to 30, 2 to 20, 2 to 15, or 2 to 10.may include However, the second cell assembly is stacked on one surface of the first cell assembly, and the cell body of the second cell assembly is accommodated in the first receiving groove of the first cell assembly, and is included in the second cell assembly. The number of may be one less than the number of battery cells included in the first cell assembly.
[72]
The present invention can increase the space utilization rate by the structure of such a battery module. In addition, there is an advantage in that a gap such as a gas pocket can be secured when gas is generated inside the battery cell of the cell assembly.
[73]
[74]
In one embodiment, the battery module according to the present invention includes a thermal insulation pad and a cooling pad. Specifically, the thermal insulation pad and the cooling pad are disposed between the first and second cell assemblies. Specifically, the heat insulation pad and the cooling pad are disposed in the first and second receiving grooves of the first and second cell assemblies. Accordingly, the thermal insulation pad and the cooling pad may be disposed between the first and second assemblies to directly cool the battery cell.
[75]
The heat insulating pad serves to prevent heat from passing between the battery cells of the first and second cell assemblies, and may be a commonly used heat insulating pad. In addition, the cooling pad may be in the form of a tube containing insulating oil or the like therein.
[76]
In a specific embodiment, the first cell assembly is arranged such that a first electrode lead of one battery cell contacts a second electrode lead of a neighboring battery cell. Accordingly, in the first cell assembly, adjacent battery cells are electrically connected to each other. Meanwhile, on one surface of the first cell assembly, a first accommodating groove may be formed in a space where the first electrode lead and the second electrode lead of the neighboring battery cells are connected.
[77]
In addition, a heat insulating pad may be disposed in the first receiving groove. In this case, the heat insulating pad may be disposed on the front surface of the first receiving groove, and may be disposed on the first and second terraces and upper surfaces of the first and second electrode leads. In another embodiment, the heat insulating pad may be disposed in the first receiving groove, and may be disposed on upper surfaces of the first and second terraces.
[78]
A cooling pad may be disposed in the first receiving groove in which the heat insulation pad is disposed, and a cooling pad may also be disposed on an upper portion of a cell body of a battery cell included in the first cell assembly. In particular, the cooling pad disposed on the upper surface of the cell body may directly cool the battery cell.
[79]
Next, after the heat insulation pad is disposed on the upper surface of the cell body of the battery cell on which the cooling pad is disposed, the second cell assembly may be stacked on the top surface of the first cell assembly on which the heat insulation pad and the cooling pad are disposed. Meanwhile, the second cell assembly has a structure in which seven battery cells are electrically connected to each other and arranged as a single layer. In addition, in the second cell assembly, like the first cell assembly, the first electrode lead of one battery cell may be in contact with the second electrode lead of the adjacent battery cell, so that the adjacent battery cells may be electrically connected to each other. For example, the first cell assembly may include 8 battery cells, and the second cell assembly may include 7 battery cells. However, the present invention is not limited thereto.
[80]
More specifically, when the second cell assembly is stacked on the upper surface of the first cell assembly, the battery cells are stacked so that convexly protruding regions face each other. In this case, the convexly protruding area of ​​the battery cell in the first cell assembly is disposed in the second receiving groove of the second cell assembly, and the convexly protruding area of ​​the battery cell in the second cell assembly is the first of the first cell assembly. placed in the receiving groove. By disposing the first and second cell assemblies, the space utilization rate of the battery module may be increased.
[81]
[82]
In another example, the battery module according to the present invention includes m first cell assemblies (m is an integer of 2 or more) arranged in the same layer as each other, and n (n is 2 or more) arranged in the same layer. integer) of a second cell assembly. In this case, each first receiving groove of the j-th (j is an integer greater than or equal to 1 and less than or equal to n-1) of the first cell assembly is arranged on the same axis as each first receiving groove of the j+1-th first cell assembly. each second accommodating groove of the k-th (k is an integer greater than or equal to 1 and less than or equal to m-1) second cell assembly is located on the same axis as each second accommodating groove of the k+1-th second cell assembly. It has an arranged structure. Meanwhile, the number (m) of the first cell assemblies arranged on the same layer may be 2 to 10, 2 to 8, or 2 to 6, for example, four. In addition, the number (n) of the second cell assemblies arranged on the same layer may be 2 to 10, 2 to 8, or 2 to 6, for example, four.
[83]
For example, the battery module according to the present invention includes four first cell assemblies arranged on the same layer as each other. At this time, each of the first receiving grooves of the first first cell assembly is arranged on the same axis as each of the first receiving grooves of the second first cell assembly. In addition, the battery module according to the present invention includes four second cell assemblies arranged on the same layer as each other. At this time, each second receiving groove of the first second cell assembly is arranged on the same axis as each second receiving groove of the second second cell assembly.
[84]
As described above, the cell body of the second cell assembly may be disposed in the first accommodating groove of the first cell assembly, and the cell body of the first cell assembly may be disposed in the second accommodating groove of the second cell assembly.
[85]
[86]
In another example, the battery module according to the present invention includes first and second cell assemblies. As described above, the cell bodies of the battery cells included in the first and second cell assemblies are arranged on the same layer. Specifically, when the second cell assembly is stacked on the upper surface of the first cell assembly, the cell body of the battery cell included in the first cell assembly and the cell body of the battery cell included in the second cell assembly face each other is stacked with
[87]
Meanwhile, in the second cell assembly, a region opposite to the convexly protruding region of the battery cell has a flat structure. That is, the other side of the second cell assembly has a flat structure.
[88]
Furthermore, the first assembly may be disposed again on the flat surface of the second cell assembly. That is, the first and second cell assemblies have a structure in which a plurality of layers are stacked.
[89]
The present invention can increase the space utilization rate by the structure of such a battery module. In addition, there is an advantage in that a gap such as a gas pocket can be secured when gas is generated inside the battery cell of the cell assembly.
[90]
[91]
Meanwhile, the present invention provides a battery pack including the battery module described above.
[92]
The battery pack is applicable to various types of energy storage devices or power sources. For example, the energy storage device is an Energy Storage System (ESS) that stores a large amount of electrical energy. In addition, the power source is applicable as a power source of a moving means, for example, a vehicle. The vehicle refers to various types of vehicles using secondary batteries as auxiliary power sources or main power sources. Specifically, the vehicle includes a hybrid (HEV), a plug-in hybrid (PHEV), or a pure electric vehicle (BEV, EV).
[93]
[94]
Hereinafter, the present invention will be described in more detail with reference to drawings and examples. Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.
[95]
[96]
(First embodiment)
[97]
3 is a schematic diagram and a cross-sectional view (A-A') of a battery module according to an embodiment of the present invention, and FIG. 4 schematically shows a cell assembly of a battery module according to an embodiment of the present invention. It is a drawing. Hereinafter, the battery module of the present invention will be described in detail with reference to FIGS. 3 and 4 .
[98]
The battery module 100 according to the present invention includes a tray 110 having a battery cell accommodating part formed therein; a first cell assembly 130 accommodated in the battery cell accommodating part of the tray 110 , the plurality of battery cells 120 are electrically connected to each other and arranged in a single layer; and a second cell assembly 140 accommodated in the battery cell accommodating part of the tray 110 , in which a plurality of battery cells 120 are electrically connected to each other and arranged in a single layer.
[99]
In this case, the battery cell 120 includes a cell body 121 , first and second electrode leads 1221 and 1222 protruding in both directions about the cell body 121 , and first and second electrodes, respectively. It has a structure in which first and second terraces 1211 and 1212 are formed in regions where the leads 1221 and 1222 and the cell body 121 are connected. In addition, in one surface of the first cell assembly 130 , a plurality of first accommodating grooves are formed in a space in which the first electrode lead 1221 and the second electrode lead 1222 of the battery cells 120 adjacent to each other are connected. (131) is the structure formed.
[100]
Furthermore, the cell body 121 of the battery cell 120 of the second cell assembly 140 is accommodated in each of the first receiving grooves 131 of the first assembly 130 to accommodate each of the first and second cells. The cell body 121 of the battery cell 120 included in the assemblies 130 and 140 is arranged on the same layer. Meanwhile, a heat insulating pad 150 and a cooling pad 160 are disposed between the first and second assemblies 130 and 140 .
[101]
More specifically, the battery module 100 according to the present invention includes a first cell assembly 130 and a second cell assembly 140 in which a plurality of battery cells 120 are connected in a single layer. And, it has a structure in which the second cell assembly 140 is stacked on the upper surface of the first cell assembly 130 . In this case, the battery cells 120 constituting the first cell assembly 130 and the battery cells 120 constituting the second cell assembly 140 are alternately arranged. This is the first cell assembly This means that the cell body 121 of the battery cell 120 constituting 130 and the cell body 121 of the battery cell 120 constituting the second cell assembly 140 are alternately arranged. Accordingly, the cell body 121 of the battery cells 120 included in the first and second cell assemblies 130 and 140 may be arranged on the same layer as each other, and by the structure of the battery module 100 , the battery It is possible to increase the space utilization rate of the module.
[102]
[103]
The first cell assembly 130 according to the present invention has a structure in which eight battery cells 120 are electrically connected to each other and arranged in a single layer. In this case, the battery cells 120 included in the first cell assembly 130 are electrically connected to the neighboring battery cells 120 . Specifically, the first electrode lead 1221 of one battery cell 120 is disposed to be in contact with the second electrode lead 1222 of the neighboring battery cell 120 so that the neighboring battery cells 120 are electrically connected to each other. is connected to More specifically, the first electrode lead 1221 of one battery cell 120 is connected to each other by welding with the second electrode lead 1222 of the neighboring battery cell 120 .
[104]
Meanwhile, the first cell assembly 130 includes a plurality of first receiving grooves 141 . When the second cell assembly 140 is stacked on top of the first cell assembly, the first receiving groove 141 is formed so that the cell body 121 of the battery cell 120 constituting the second cell assembly 140 is formed. This is a space in which the battery cells 120 adjacent to each other are electrically connected to each other.
[105]
Specifically, in the first cell assembly 130 , the second electrode lead 1222 of the firstly arranged battery cell 120 is arranged to be in contact with the first electrode lead 1221 of the secondly arranged battery cell 120 . . In this case, the cell body 121 of the battery cell 120 has a structure in which one side protrudes convexly, so that the first and second terraces 1211 and 1212 are areas where the cell body 121 is not formed. The region in which the first and second electrode leads 1221 and 1222 are formed has a structure in which concave grooves are formed compared to the cell body. That is, a relatively concave groove is formed between the cell bodies 121 adjacent to each other in the first cell assembly 130 . This structure is also the same for the second cell assembly 140 . Here, in the first cell assembly 130 , the concave groove becomes the first accommodating groove 131 , and in the second assembly 140 , the concave groove becomes the second accommodating groove 141 .
[106]
In addition, when the second cell assembly 140 is stacked on the upper surface of the first cell assembly 130 , the first receiving groove 131 contains the battery cell 120 included in the second cell assembly 140 . The cell body 121 is disposed, and the cell body 121 of the battery cell 120 included in the first cell assembly 130 is disposed in the second receiving groove 141 . Meanwhile, when the second cell assembly 140 is stacked on the upper surface of the first cell assembly 130 , the cell body 121 and the second cell of the battery cell 120 included in the first cell assembly 130 . The cell body 121 of the battery cell 120 included in the assembly 140 is stacked in a direction facing each other.
[107]
In the present invention, the space utilization rate can be increased by the structure of the battery module 100 . In addition, there is an advantage in that a gap such as a gas pocket can be secured when gas is generated inside the battery cells 120 of the cell assemblies 130 and 140 .
[108]
[109]
The battery module 100 according to the present invention includes a heat insulating pad 150 and a cooling pad 160 . Specifically, the thermal insulation pad 150 and the cooling pad 160 are disposed between the first and second assemblies 130 and 140 .
[110]
Specifically, the heat insulating pad 150 and the cooling pad 160 are disposed in the first and second receiving grooves 131 and 141 of the first and second assemblies 130 and 140 . Accordingly, the heat insulating pad 150 and the cooling pad 160 are disposed between the first and second assemblies 130 and 140 to directly cool the battery cells.
[111]
With this structure, heat generated inside the battery cell 120 can be effectively dissipated to the outside, and thus, it is determined that the lifespan characteristics of the battery can be improved.
[112]
[113]
(Second embodiment)
[114]
5 is a view showing in detail a cross-sectional view of a battery module and a configuration of a battery cell according to another embodiment of the present invention. Hereinafter, the battery module of the present invention will be described in detail with reference to FIG. 5 .
[115]
The battery module 200 according to the present invention includes a tray 210 having a battery cell receiving part formed therein; a first cell assembly 230 accommodated in the battery cell accommodating part of the tray 210 , the plurality of battery cells 220 being electrically connected to each other and arranged in a single layer; and a second cell assembly 240 accommodated in the battery cell accommodating part of the tray 210 , wherein the plurality of battery cells 220 are electrically connected to each other and arranged in a single layer.
[116]
In this case, the battery cell 220 includes a cell body 221 , first and second electrode leads 2221 and 2222 protruding in both directions about the cell body 221 , and first and second electrodes, respectively. It has a structure in which first and second terraces 2211 and 2212 are formed in regions where the leads 2221 and 1222 and the cell body 221 are connected. More specifically, in the battery cell 220 , first and second terraces 2211 and 2212 are widely formed on both sides, respectively, and first and second electrode leads 2221 and 2222 are respectively first and second It has a small exposed structure from the terraces 2211 and 2212 . The area of ​​each of the first and second terraces 2211 and 2212 may be approximately 10 times the area of ​​the exposed first and second electrode leads 2221 and 2222 . In the battery cell 220 , the areas of the first and second electrode leads 2221 and 2222 are smaller than the areas of the first and second terraces 2221 and 2212 , so that the first and second electrode leads 2221 are small. , 2222) can be minimized, and thus, the risk of short circuit of the battery cell 220 can be reduced. In addition, by forming the first and second terraces 2211 and 2212 to be wide, there is an advantage in that a buffer area can be secured when gas is generated inside the cell body 221 .
[117]
In one surface of the first cell assembly 230 , a plurality of first receiving grooves 231 are formed in a space where the first electrode leads 2221 and the second electrode leads 2222 of the battery cells 220 are connected to each other. ) is the structure in which
[118]
Furthermore, the cell body 221 of the battery cell 220 of the second cell assembly 240 is accommodated in each of the first receiving grooves 231 of the first assembly 230 to accommodate each of the first and second cells. The cell bodies 221 of the battery cells 220 included in the assemblies 230 and 240 are arranged on the same layer. Meanwhile, a heat insulating pad 250 and a cooling pad 260 are disposed between the first and second assemblies 230 and 240 .
[119]
On the other hand, in the battery cell 220 , the length of the cell body 221 in the region in which the first and second electrode leads 2221 and 2222 protrude is such that the first and second electrode leads 2221 and 2222 do not protrude. It has a structure formed to be longer than the length of the cell body 221 of the region. That is, the battery cell 220 has a structure in which the width W is longer than the length L of the cell body 221 .
[120]
This is when the current flows from the first electrode lead 2221 to the second electrode lead 2222 of the battery cell 220, the current flowing from the first electrode lead 2221 to the second electrode lead 2222 The distance through which the current flows until it is transmitted is shortened. Accordingly, the internal resistance of the battery cell 220 may be reduced.
[121]
[122]
In addition, the battery cell 220 has a structure in which an area in which the cell body 221 is formed convexly protrudes. More specifically, one side of the battery cell 220 has a structure in which a region in which the cell body 221 is formed convexly protrudes, and the other side of the battery cell 220 has a flat structure. Here, the flat structure means that the bottom of the battery cell 220 is flat, and the bottom surfaces of the first and second electrode leads 2221 and 2222 and the first and second terraces 2211 and 2212 are the cell body 221 . ) is located on the same line as the bottom surface of
[123]
In particular, when the second cell assembly 240 is stacked on the first cell assembly 230 , the convexly protruding regions of the battery cells 220 are stacked to face each other. In this case, the convexly protruding region of the battery cell 220 in the first cell assembly 230 is disposed in the second receiving groove 241 of the second cell assembly 240 , and the battery in the second cell assembly 240 is The convexly protruding region of the cell 220 is disposed in the first receiving groove 241 of the first cell assembly 230 .
[124]
Meanwhile, in the second cell assembly 240 , a region opposite to the convexly protruding region of the battery cell 220 has a flat structure. That is, the other side of the second cell assembly 240 has a flat structure. Accordingly, the battery module 200 of the present invention can increase the space utilization rate.
[125]
Meanwhile, the description of each configuration of the battery module according to the present invention has been described above, and detailed description of each configuration will be omitted.
[126]
[127]
(Third embodiment)
[128]
6 is a view showing an assembly process of a battery module according to another embodiment of the present invention. Hereinafter, an assembly process of a battery module according to another embodiment of the present invention will be described in detail with reference to FIG. 6 .
[129]
First, the first cell assembly 330 is accommodated in the tray 310 in which the battery cell accommodating part is formed. The first cell assembly 330 has a structure in which eight battery cells 320 are electrically connected to each other and arranged in a single layer. In this case, the battery cells 320 included in the first cell assembly 330 are electrically connected to the neighboring battery cells 320 . Specifically, the first electrode of one battery cell 320 The lead 3221 is disposed to be in contact with the second electrode lead 3222 of the adjacent battery cell 320 so that the adjacent battery cells 320 are electrically connected to each other. Meanwhile, on one surface of the first cell assembly 330 , a first accommodating groove 331 is formed in a space where the first electrode lead 3221 and the second electrode lead 3222 of the battery cells 320 are connected to each other. is a structure (Fig. 6a).
[130]
Then, the heat insulating pad 350 is disposed in the first receiving groove 331 . The heat insulating pad 350 is disposed on the front surface of the first receiving groove 341 , and is disposed on the upper surfaces of the first and second terraces 3211 and 3212 and the first and second electrode leads 3221 and 3222 . (Fig. 6b).
[131]
The cooling pad 360 is disposed in the first accommodating groove 341 in which the heat insulation pad 350 is disposed, and the battery cell 320 included in the first cell assembly 330 is also cooled on the top of the cell body 321 . The pad 360 is placed. In particular, the cooling pad 360 disposed on the upper surface of the cell body 321 may directly cool the battery cell 320 ( FIGS. 6C-6D ).
[132]
Next, after the heat insulating pad 360 is disposed on the upper surface of the cell body 321 of the battery cell 320 in which the cooling pad 360 is disposed, the first heat insulating pad 350 and the cooling pad 360 are disposed. A second cell assembly 340 is stacked on the upper surface of the first cell assembly 330 . Meanwhile, the second cell assembly 340 has a structure in which seven battery cells 320 are electrically connected to each other and arranged in a single layer. In the second cell assembly 340 , like the first cell assembly 330 , the first electrode lead 3221 of one battery cell 320 is in contact with the second electrode lead 3222 of the neighboring battery cell 320 . The battery cells 320 adjacent to each other are arranged to be electrically connected to each other. Meanwhile, in the drawings, the first cell assembly 330 includes eight battery cells 320 and the second cell assembly 330 includes seven battery cells 320 , but the present invention is not limited thereto. .
[133]
More specifically, when the second cell assembly 340 is stacked on the upper surface of the first cell assembly 330 , the convexly protruding regions of the battery cells 320 are stacked to face each other. In this case, the convexly protruding region of the battery cell 320 in the first cell assembly 330 is disposed in the second receiving groove 341 of the second cell assembly 340 , and the battery in the second cell assembly 340 is disposed in the second cell assembly 340 . The convexly protruding region of the cell 320 is disposed in the first receiving groove 341 of the first cell assembly 330 . By disposing the first and second cell assemblies 330 and 340 , the space utilization rate of the battery module 300 may be increased ( FIGS. 6E-F ).
[134]
Furthermore, the cooling pad 360 may be disposed to contact the cell body 321 of the battery cell 320 to directly cool the battery cell 320 .
[135]
Meanwhile, the description of each configuration of the battery module according to the present invention has been described above, and detailed description of each configuration will be omitted.
[136]
[137]
(Fourth embodiment)
[138]
7 is a view schematically showing a battery module in which a heat insulating pad is disposed in the assembly process of the battery module according to another embodiment of the present invention.
[139]
Referring to FIG. 7 , the battery module 400 according to the present invention accommodates the first cell assembly 430 in a tray 410 having a battery cell accommodating part formed therein. The first cell assembly 430 has a structure in which eight battery cells 420 are electrically connected to each other and arranged in a single layer.
[140]
In addition, the first accommodating groove 431 of the first cell assembly 430 and the heat insulating pad 450 are disposed. The heat insulating pad 450 is disposed in the first receiving groove 431 , and disposed on upper surfaces of the first and second terraces 4211 and 4212 . Meanwhile, although not shown in the drawings, when the heat insulating pad 450 is disposed on the upper surface of the cell body 421 of the battery cell 420, the heat insulating pad may be disposed on the first and second terraces of the second cell assembly. can
[141]
The description of each configuration of the battery module according to the present invention has been described above, and detailed description of each configuration will be omitted.
[142]
[143]
(fifth embodiment)
[144]
8 is a schematic view of a battery module and a cross-sectional view (A-A') of the battery module according to another embodiment of the present invention.
[145]
Referring to FIG. 8 , the battery module 500 according to the present invention includes: a tray 510 having a battery cell accommodating part formed therein; a first cell assembly 530 accommodated in the battery cell accommodating part of the tray 510, the plurality of battery cells 520 being electrically connected to each other and arranged in a single layer; and a second cell assembly 540 accommodated in the battery cell accommodating part of the tray 510 , in which a plurality of battery cells 520 are electrically connected to each other and arranged in a single layer.
[146]
In this case, the battery cell 520 includes a cell body 521 , first and second electrode leads 5221 and 5222 protruding in both directions about the cell body 521 , and first and second electrodes, respectively. It has a structure in which first and second terraces 5211 and 5212 are formed in regions where the leads 5221 and 5222 and the cell body 521 are connected. In addition, in one surface of the first cell assembly 530 , a plurality of first receiving grooves are formed in a space in which the first electrode lead 5221 and the second electrode lead 5222 of the battery cells 520 adjacent to each other are connected. (531) is the structure formed.
[147]
Furthermore, the cell body 521 of the battery cell 520 of the second cell assembly 540 is accommodated in each of the first receiving grooves 531 of the first assembly 530 to accommodate each of the first and second cells. The cell bodies 521 of the battery cells 520 included in the assemblies 530 and 540 are arranged on the same layer. Meanwhile, a heat insulating pad 550 and a cooling pad 560 are disposed between the first and second assemblies 530 and 540 .
[148]
In particular, the battery module 500 according to the present invention includes m first cell assemblies 530 (m is an integer greater than or equal to 2) arranged in the same layer as each other, and n (n is an integer) arranged in the same layer. and a second cell assembly 540 (an integer greater than or equal to 2). At this time, each of the first receiving grooves 531 of the j-th (j is an integer greater than or equal to 1, and less than or equal to n-1) first cell assembly 530 is each of the first receiving grooves 531 of the j+1-th first cell assembly 530 . Each second receiving groove 541 of the k-th (k is an integer greater than or equal to 1 and less than or equal to m-1) second cell assembly 540 having a structure arranged on the same axis as the first receiving groove 531 is k It has a structure arranged on the same axis as each of the second receiving grooves 541 of the +1-th second cell assembly 540 .
[149]
Specifically, the battery module 500 according to the present invention includes four first cell assemblies 530 arranged on the same layer as each other. In this case, each of the first receiving grooves 531 of the first first cell assembly 530 is arranged on the same axis as each of the first receiving grooves 531 of the second first cell assembly 530 . In addition, the battery module 500 according to the present invention includes four second cell assemblies 540 arranged on the same layer. In this case, each of the second receiving grooves 541 of the first second cell assembly 540 is arranged on the same axis as each of the second receiving grooves 541 of the second second cell assembly 540 .
[150]
The description of each configuration of the battery module according to the present invention has been described above, and detailed description of each configuration will be omitted.
[151]
[152]
9 is a view showing an assembly process of a battery module according to another embodiment of the present invention. Hereinafter, an assembly process of a battery module according to another embodiment of the present invention will be described in detail with reference to FIG. 9 .
[153]
First, the first cell assembly 530 is accommodated in the tray 510 in which the battery cell accommodating part is formed. The first cell assembly 530 has a structure in which eight battery cells 520 are electrically connected to each other and arranged in a single layer. In this case, the battery cells 520 included in the first cell assembly 530 are electrically connected to the neighboring battery cells 520 . Specifically, the first electrode lead 5221 of one battery cell 520 is disposed to be in contact with the second electrode lead 5222 of the neighboring battery cell 520 so that the neighboring battery cells 520 are electrically connected to each other. is connected to Meanwhile, on one surface of the first cell assembly 530 , a first accommodating groove 531 is formed in a space where the first electrode lead 5221 and the second electrode lead 5222 of the battery cells 520 adjacent to each other are connected. It is a structure that becomes (FIG. 9a).
[154]
Meanwhile, the four first cell assemblies 530 are arranged on the same layer on the tray 510 . In this case, the first accommodating groove 531 formed in the firstly arranged first cell assembly 530 has a structure arranged on the same axis as the first receiving groove 531 formed in the secondly arranged first cell assembly 530 . (Fig. 9b).
[155]
Then, the heat insulating pad 550 is disposed in the first receiving groove 531 . The heat insulating pad 550 is disposed on the front surface of the first receiving groove 531 , and is disposed on the first and second terraces 5211 and 5212 and upper surfaces of the first and second electrode leads 5221 and 5222 . (Fig. 9c).
[156]
The cooling pad 560 is disposed in the first receiving groove 531 in which the heat insulation pad 550 is disposed, and the battery cell 520 included in the first cell assembly 530 is also cooled on the top of the cell body 521 . Pad 560 is placed. In particular, the cooling pad 560 disposed on the upper surface of the cell body 521 may directly cool the battery cell 520 ( FIGS. 9D-9E ).
[157]
Next, after the heat insulating pad 560 is disposed on the upper surface of the cell body 521 of the battery cell 520 in which the cooling pad 560 is disposed, the first heat insulating pad 550 and the cooling pad 560 are disposed. A second cell assembly 540 is stacked on the upper surface of the first cell assembly 530 . Meanwhile, the second cell assembly 540 includes seven battery cells 520) are electrically connected to each other and have a structure in which they are arranged in a single layer. In the second cell assembly 540 , like the first cell assembly 530 , the first electrode lead 5221 of one battery cell 520 is in contact with the second electrode lead 5222 of the neighboring battery cell 520 . The battery cells 520 adjacent to each other are arranged to be electrically connected to each other. Meanwhile, in the drawings, the first cell assembly 530 includes eight battery cells 520 and the second cell assembly 530 includes seven battery cells 520 , but the present invention is not limited thereto. .
[158]
More specifically, when the second cell assembly 540 is stacked on the upper surface of the first cell assembly 530 , the convexly protruding regions of the battery cells 520 are stacked to face each other. In this case, the convexly protruding region of the battery cell 520 in the first cell assembly 530 is disposed in the second receiving groove 541 of the second cell assembly 540 , and the battery in the second cell assembly 540 is The convexly protruding region of the cell 520 is disposed in the first receiving groove 541 of the first cell assembly 530 . By disposing the first and second cell assemblies 530 and 540 , the space utilization rate of the battery module 500 may be increased ( FIGS. 6f-g ).
[159]
Furthermore, the cooling pad 560 may be disposed to contact the cell body 521 of the battery cell 520 to directly cool the battery cell 520 .
[160]
[161]
(Sixth embodiment)
[162]
10 is a schematic diagram of a battery module according to another embodiment of the present invention.
[163]
Referring to FIG. 10 , the battery module 600 according to the present invention includes: a tray 610 having a battery cell accommodating part formed therein; a first cell assembly 630 accommodated in the battery cell accommodating part of the tray 510, the plurality of battery cells 620 are electrically connected to each other and arranged in a single layer; and a second cell assembly 640 accommodated in the battery cell accommodating part of the tray 610 , in which a plurality of battery cells 620 are electrically connected to each other and arranged in a single layer.
[164]
In this case, the cell body 621 of the battery cell 620 included in the first and second cell assemblies 630 and 640 is arranged on the same layer. Specifically, when the second cell assembly 640 is stacked on the upper surface of the first cell assembly 630 , the cell body 621 and the second cell body 621 of the battery cell 620 included in the first cell assembly 630 . The cell body 621 of the battery cell 620 included in the cell assembly 640 is stacked in a direction facing each other.
[165]
Meanwhile, in the second cell assembly 640 , a region opposite to the convexly protruding region of the battery cell 620 has a flat structure. That is, the other side of the second cell assembly 640 has a flat structure.
[166]
Furthermore, the first assembly 630 may be disposed again on the flat surface of the second cell assembly 640 . That is, the first and second cell assemblies 630 and 640 have a structure in which a plurality of layers are stacked.
[167]
In the present invention, the space utilization rate can be increased by the structure of the battery module 600 . In addition, there is an advantage in that a gap such as a gas pocket can be secured when gas is generated inside the battery cell 620 of the cell assemblies 630 and 640 .
[168]
The description of each configuration of the battery module according to the present invention has been described above, and detailed description of each configuration will be omitted.
[169]
[170]
Above, the present invention has been described in more detail with reference to drawings and examples. However, since the configuration described in the drawings or embodiments described in the present specification is only one embodiment of the present invention and does not represent all the technical spirit of the present invention, various equivalents and It should be understood that there may be variations.
[171]
[172]
[Explanation of code]
[173]
100, 200, 300, 400, 500, 600: battery module
[174]
110, 210, 310, 410, 510, 610: tray
[175]
120, 220, 320, 420, 520, 620: battery cell
[176]
121, 221, 321, 421, 521, 621: cell body
[177]
1211, 2211, 3211, 4211, 5211: first terrace
[178]
1212, 2212, 3212, 4212, 5212: second terrace
[179]
1221, 2221, 3221, 5221: first electrode lead
[180]
1222, 2222, 3222, 5222: second electrode lead
[181]
130, 230, 330, 430, 530, 630: first cell assembly
[182]
131, 231, 331, 431, 531: first receiving groove
[183]
140, 240, 340, 540, 640: second cell assembly
[184]
141, 241, 341, 541: second receiving groove
[185]
150, 250, 350, 450, 550: insulation pad
[186]
160, 260, 360, 560: cooling pad
Claims
[Claim 1]
a tray having a battery cell accommodating part formed therein; a first cell assembly accommodated in the battery cell accommodating part of the tray, the plurality of battery cells being electrically connected to each other and arranged in a single layer; and a second cell assembly accommodated in the battery cell accommodating part of the tray, wherein the plurality of battery cells are electrically connected to each other and arranged in a single layer, wherein the battery cells protrude in both directions about the cell body and the cell body. It has a structure in which first and second electrode leads and first and second terraces are formed in regions where each of the first and second electrode leads and the cell body are connected, and on one surface of the first cell assembly, adjacent battery cells A plurality of first accommodating grooves formed in a space where the first electrode lead and the second electrode lead are connected are formed, and each first accommodating groove of the first assembly has a cell of a battery cell of a second cell assembly. A structure in which the body is accommodated and the cell bodies of the battery cells included in each of the first and second cell assemblies are arranged on the same layer, and a heat insulating pad and a cooling pad are disposed between the first and second assemblies. having a battery module.
[Claim 2]
According to claim 1, wherein the second cell assembly has a structure in which a plurality of second receiving grooves formed in a space where the first electrode lead and the second electrode lead of the neighboring battery cells are connected to each other are formed on one surface, the second A battery module having a structure in which the cell body of the battery cell of the first assembly is accommodated in each of the second receiving grooves of the assembly.
[Claim 3]
The battery module according to claim 1, wherein the battery cell has a structure in which a cell body length in a region in which the first and second electrode leads protrude is longer than a cell body length in a region in which the first and second electrode leads do not protrude. .
[Claim 4]
The battery module according to claim 1, wherein one side of the battery cell has a structure in which a region in which the cell body is formed is convexly protruded, and the other side of the battery cell has a flat structure.
[Claim 5]
The method according to claim 1, wherein the battery module includes m first cell assemblies (m is an integer greater than or equal to 2) arranged on the same layer, and a j-th (j is an integer greater than or equal to 1 and less than or equal to n-1) A battery module having a structure in which each of the first receiving grooves of the one-cell assembly is arranged on the same axis as each of the first receiving grooves of the j+1-th first cell assembly.
[Claim 6]
The method according to claim 1, wherein the battery module includes n second cell assemblies (n is an integer greater than or equal to 2) arranged in the same layer as each other, and the k-th (k is an integer greater than or equal to 1 and less than or equal to m-1) of the second cell assembly. A battery module having a structure in which each of the second receiving grooves of the two-cell assembly is arranged on the same axis as each of the second receiving grooves of the k+1-th second cell assembly.
[Claim 7]
The method of claim 1, wherein the heat insulating pad is disposed between the first and second cell assemblies, and is disposed in a region in contact with the first and second terraces of the battery cells included in the first and second cell assemblies, or A battery module having a structure disposed in a region in contact with the first and second terraces and the first and second electrode leads.
[Claim 8]
The battery module according to claim 1, wherein the cooling pad is disposed between the first and second cell assemblies, and disposed in a region in contact with the cell body of the battery cells included in the first and second cell assemblies.
[Claim 9]
The battery module according to claim 1, wherein each of the first and second cell assemblies has a structure in which a plurality of battery cells are electrically connected in series to each other.
[Claim 10]
The battery according to claim 1, wherein the cell bodies of the battery cells included in the first and second cell assemblies are arranged on the same layer, and the first and second cell assemblies have a structure in which a plurality of layers are stacked. module.
[Claim 11]
A battery pack comprising the battery module according to claim 1 .