Title of Invention: A battery cell in which electrode leads are formed in an asymmetric structure and a battery module with reinforced mechanical strength including the same
technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0114877 as of September 8, 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 cell in which electrode leads are formed in an asymmetric structure, and to a battery module with reinforced mechanical strength including the same.
background
[3]
Recently, due to the depletion of fossil fuels, the price of energy sources increases and interest in environmental pollution is increasing, and the demand for eco-friendly alternative energy sources is becoming an indispensable factor for future life. Accordingly, research on various power production technologies, such as nuclear power, solar power, wind power, and tidal power, continues, and power storage devices for using the generated energy more efficiently are also of great interest.
[4]
In particular, as technology development and demand for mobile devices increase, the demand for batteries as an energy source is rapidly increasing, and thus, research on batteries that can meet various needs is being conducted.
[5]
Typically, in terms of battery shape, there is a high demand for pouch-type secondary batteries that can be applied to products such as mobile phones due to their thin thickness, and in terms of materials, lithium ion batteries have advantages such as high energy density, discharge voltage, and output stability. , the demand for lithium secondary batteries such as lithium ion polymer batteries is high.
[6]
The pouch-type battery has a structure in which an electrode assembly including a positive electrode, a negative electrode, and a separator disposed therebetween is built-in inside the case, and the positive and negative electrode tabs are respectively bonded to the electrode leads and sealed so as to be exposed to the outside of the case. These electrode leads are electrically connected to an external device through contact, and the battery supplies power to an external device or receives power from an external device through the electrode leads.
[7]
However, when a battery module is formed by combining a plurality of battery cells, the pouch-type battery has a limitation in that the space efficiency is not good due to the protruding electrode lead or the terrace area formed in the sealing process. In addition, there is a problem that a separate space is required to form the reinforcement bar in order to reinforce the mechanical strength of the battery module.
[8]
1 shows a conventional battery cell. As shown in FIG. 1, in the conventional pouch-type battery cell, a first electrode lead 21 and a second electrode lead 22 protrude from both sides based on the cell body 11 in which the electrode assembly is embedded, respectively. the structure formed. Specifically, looking at the side of the cell body 11 on which the first electrode lead 21 is formed, the height of the cell body 11 is low in the width direction of the battery cell 10 with respect to the first electrode lead 21 . It is a structure in which the shoulder line tolerances (12, 13) are formed. In addition, it has a structure in which a shoulder line tolerance is formed in both width directions with respect to the second electrode lead 22 .
[9]
FIG. 2 illustrates a structure in which the battery pack 50 is formed by combining the battery cells 10 shown in FIG. 1 . Referring to FIG. 2 , four battery modules 31 , 32 , 33 , 34 in which a plurality of battery cells 10 are accommodated are assembled to form one battery pack 50 . In this case, the reinforcement bar 40 is formed in order to increase the mechanical strength inside the battery pack 50 . The reinforcing bar 40 is formed at a position crossing between the battery modules 31 and 32 located on the left and the battery modules 33 and 34 located on the right. The conventional battery pack 50 requires a separate space to form the reinforcing bar 40 , and thus there is a problem in that space utilization is reduced.
[10]
Accordingly, there is a need for a new technology capable of improving mechanical strength while increasing space efficiency when assembling a battery pack.
[11]
[Prior art literature]
[12]
[Patent Literature]
[13]
(Patent Document 1) Korean Patent Publication No. 2019-0069873
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[14]
In order to solve the problems of the prior art as described above, the present invention requires a technology capable of improving mechanical strength while increasing space efficiency in the process of forming a battery module using a pouch-type battery cell.
means of solving the problem
[15]
The present invention provides a battery cell in which electrode leads are formed in an asymmetric structure. In one example, the battery cell according to the present invention is a pouch-type battery cell, the cell body in which the electrode assembly is accommodated; a first electrode lead protruding in one direction of the cell body; and a second electrode lead formed to protrude in a direction opposite to the direction in which the first electrode lead of the cell body is formed, wherein the first electrode lead is disposed in either side direction with respect to a central axis in the longitudinal direction of the battery cell. A dead space is formed on the other side by being biased, and the second electrode lead is biased in the opposite direction to the first electrode lead with respect to the central axis in the longitudinal direction of the battery cell to form a dead space on the other side. is the structure
[16]
In one example, the cell body has a structure in which a shoulder line tolerance in which a height is lowered on both sides in a width direction with respect to the first and second electrode leads is formed.
[17]
In a specific example, in the cell body, the ratio of the width direction length of the shoulder line tolerance formed on both sides of the width direction with respect to the first and second electrode leads is in the range of 1:2 to 1:10.
[18]
The present invention provides a battery module including a cell stack in which a plurality of battery cells described above are stacked. In one example, the battery module according to the present invention, a cell stack in which a plurality of battery cells are stacked; a housing accommodating the battery cell stack; and a reinforcing pole penetrating through the battery cell stack. In addition, the cell stack has a structure in which m (m is an integer of 2 or more) battery cells are arranged in the x-axis direction, and n (n is an integer of 2 or more) battery cells are arranged in the y-axis direction. Here, the reinforcement pole has a structure penetrating the dead space between the battery cells and the battery cells arranged in the x-axis direction.
[19]
In a specific example, in the battery module according to the present invention, the battery cells arranged in the x-axis direction include the p-th (p is an integer between 1 and m-1) the second electrode lead of the arranged battery cells and the p+1-th battery cell. The first electrode leads of the battery cells are electrically connected in series by being contacted at positions facing each other.
[20]
In another specific example, the reinforcement pole has a structure penetrating a dead space between the p-th (p is an integer between 1 and m-1) disposed battery cells and the p+1-th disposed battery cells am.
[21]
For example, the cell stack has a structure in which 2 to 4 battery cells are arranged in the x-axis direction and 10 to 30 battery cells are arranged in the y-axis direction.
[22]
In one example, the housing includes a accommodating part in which the cell stack is accommodated, and both sides have a structure in which a through hole through which a reinforcing pole passes is formed.
[23]
In a specific example, the reinforcing pole has a circular or elliptical cross-section, and includes a stopper formed on at least one of an inner side and an outer side of a hole through which the reinforcing pole formed in the housing passes.
[24]
In another specific example, the housing may include: a U-shaped frame including a accommodating part in which the cell stack is accommodated; and a top plate covering an upper portion of the U-shaped frame, and both sides of the U-shaped frame have through-holes through which the reinforcing poles pass.
[25]
In another specific example, the housing may include: a bottom plate supporting the cell stack from a lower portion; and a U-shaped frame covering the cell stack positioned on the bottom play, wherein through holes through which the reinforcing poles pass are formed on both sides of the U-shaped frame.
[26]
For example, the battery module further includes an end plate that covers any one or more of both sides of the U-shaped frame.
Effects of the Invention
[27]
The battery cell and the battery module including the same according to the present invention can form a battery module using a pouch-type battery cell, but have excellent space efficiency and improve mechanical strength.
Brief description of the drawing
[28]
1 is a schematic diagram showing a conventional battery cell.
[29]
2 is a schematic diagram showing a conventional battery module.
[30]
3 is a schematic diagram illustrating a battery cell according to an embodiment of the present invention.
[31]
4 is a schematic diagram showing a cross-sectional structure of a battery module according to another embodiment of the present invention.
[32]
5 is a schematic diagram illustrating the structure of a battery pack according to another embodiment of the present invention.
Best mode for carrying out the invention
[33]
Hereinafter, the present invention will be described in detail. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of ​​the present invention based on the principle that it can be defined as
[34]
[35]
In general, in a pouch-type battery cell, a dead space is generated due to the formation of an electrode lead, which causes a decrease in space efficiency. The present invention provides a battery cell having a novel structure that can utilize a dead space according to the formation of an electrode lead. The present invention provides a battery cell in which first and second electrode leads are formed in an asymmetric structure with each other, specifically, a pouch-type battery cell.
[36]
In one embodiment, a pouch-type battery cell according to the present invention includes a cell body in which an electrode assembly is accommodated; a first electrode lead protruding in one direction of the cell body; and a second electrode lead formed to protrude in a direction opposite to a direction in which the first electrode lead of the cell body is formed. Specifically, the electrode assembly has a structure including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. In addition, the pouch-type battery cell has a structure in which the electrode assembly is sealed by a pouch-type case, and the first and second electrode leads protrude in opposite directions to each other.
[37]
In addition, in the pouch-type battery cell, the first electrode lead is biased in one side direction with respect to the central axis in the longitudinal direction of the battery cell to form a dead space in the other side. At the same time, the second electrode lead is biased in the opposite direction to the first electrode lead with respect to the central axis in the longitudinal direction of the battery cell to form a dead space on the other side thereof. In contrast to the conventional battery cells having a symmetrical structure in which electrode leads are formed in the center of one side and the other side, in the pouch-type battery cell according to the present invention, each electrode lead is formed to be biased to one side, and the first and second electrodes It is an asymmetric structure in which the leads are biased in different directions.
[38]
In one embodiment, the cell body has a structure in which a shoulder line tolerance is formed in which the height is lowered on both sides in the width direction with respect to the first and second electrode leads, respectively. The shoulder line tolerance includes a structure in which the height is lowered outwardly from the electrode lead, and the height is sequentially or continuously lowered. For example, the first electrode lead has a structure formed by being biased to the left. In this case, the right side has a long shoulder line tolerance and the left side has a short shoulder line tolerance. The shoulder line tolerance formed on the right side may have a structure including a section in which the height is sequentially lowered in a straight line, and the shoulder line tolerance formed on the left side may have a structure including a section in which the height is lowered in a curved shape drawing a convex arc. .
[39]
In a specific embodiment, in the cell body, with respect to the first and second electrode leads, the ratio of the width direction length of the shoulder line tolerance formed on both sides in the width direction, respectively, is in the range of 1:2 to 1:10. Specifically, in the cell body, with respect to the first and second electrode leads, a ratio of the width direction length of the shoulder line tolerance formed on both sides in the width direction is in the range of 1:2 to 1:10, and 1:3 to 1:10. , in the range of 1:5 to 1:10 or in the range of 1:3 to 1:6. For example, the first electrode lead has a structure formed by being biased to the left. In this case, the right side has a long shoulder line tolerance and the left side has a short shoulder line tolerance. In this case, the shoulder line tolerance formed on the left needs to secure a minimum width for sealing the corner portion, and the shoulder line tolerance formed on the right side is formed with a wide width to secure sufficient dead space.
[40]
[41]
In addition, the present invention provides a battery module including the battery cells described above. The battery cell is, for example, a pouch-type battery cell, and has an asymmetric structure in which first and second electrode leads protrude in both directions. In one embodiment, the battery module according to the present invention, a cell stack in which a plurality of battery cells are stacked; a housing accommodating the battery cell stack; and a reinforcing pole penetrating through the battery cell stack. The cell stack has a structure in which m battery cells (m is an integer greater than or equal to 2) are arranged in the x-axis direction, and n battery cells (n is an integer greater than or equal to 2) are arranged in the y-axis direction, and the reinforcement The pole has a structure penetrating the dead space between the battery cells arranged in the x-axis direction and the battery cells.
[42]
The present invention relates to a battery module formed by combining battery cells having a structure in which a shoulder line tolerance in which a height is lowered on both sides in a width direction, respectively, based on first and second electrode leads. The battery module forms a reinforcing pole to reinforce mechanical strength. In this case, the reinforcing pole is positioned to penetrate the dead space region of the battery cells. Therefore, the battery module according to the present invention does not require a separate additional space for forming the reinforcing pole.
[43]
In a specific embodiment, in the battery module, the battery cells arranged in the x-axis direction include the second electrode lead and the p+1-th battery cell of the p-th (p is an integer between 1 and m-1) arranged battery cells. The first electrode leads of the structure are electrically connected in series by being contacted at positions facing each other. Specifically, the battery cells arranged in the x-axis direction are electrically connected in series to each other to satisfy the voltage level required by the battery module. For example, in the p-th battery cell, the second electrode lead is disposed upwardly with respect to the vertically stored position, and in the p+1th battery cell, the first electrode lead is also shifted upward. In this case, the second electrode lead of the p-th battery cell and the first electrode lead of the p+1-th battery cell face each other at the same height, and both electrode leads are in contact to form an electrical series connection.
[44]
In addition, below the point where the second electrode lead of the p-th battery cell and the first electrode lead of the p+1-th battery cell contact each other, the dead spaces of both battery cells meet and an empty space through which the reinforcement pole can pass is formed. The reinforcement pole is disposed to penetrate a dead space between the p-th (p is an integer between 1 and m-1) disposed battery cells and the p+1-th disposed battery cells. In addition, the battery cells arranged in the y-axis direction are arranged such that the first and second electrode leads are respectively arranged in the same height and in the same direction.
[45]
In one embodiment, the cell stack has a structure in which 2 to 10 battery cells are arranged in the x-axis direction, and 5 to 50 battery cells are arranged in the y-axis direction. Specifically, the cell stack has a structure in which 2 to 4 battery cells are arranged in the x-axis direction and 10 to 30 battery cells are arranged in the y-axis direction. The number of battery cells accommodated in the battery module is derived by multiplying the number of battery cells arranged in the x-axis direction by the number of battery cells arranged in the y-axis direction. For example, the battery module according to the present invention may have a structure in which 48 battery cells are combined, two battery cells are arranged in the x-axis direction, and 24 battery cells are arranged in the y-axis direction. .
[46]
The battery module according to the present invention has a structure in which a cell stack is accommodated in a housing. In one embodiment, the housing includes a accommodating part in which the cell stack is accommodated, and both sides have a structure in which a through hole through which a reinforcing pole passes is formed. The reinforcing pole has a structure penetrating through the housing, thereby reinforcing the mechanical strength of the battery module.
[47]
In one specific embodiment, the reinforcing pole has a circular or elliptical cross-section, and includes a stopper formed on at least one of an inner side and an outer side of a hole through which the reinforcing pole formed in the housing passes. In the present invention, the case where the cross-section of the reinforcing pole is a quadrangle or the like is not excluded. However, in consideration of space efficiency and the fact that the battery cells must be accommodated between the dead spaces, a structure in which the reinforcing pole has a circular or oval cross-section is advantageous.
[48]
In the present invention, the shape of the housing is not particularly limited as long as it effectively accommodates the cell stack. In one embodiment, the housing may include: a U-shaped frame including a accommodating part in which the cell stack is accommodated; and a top plate covering an upper portion of the U-shaped frame, and both sides of the U-shaped frame have through-holes through which the reinforcing poles pass. Based on the cross-sectional structure, the housing may have a closed quadrangular structure. However, by accommodating the cell stack in the U-shaped frame located at the lower portion and forming a structure covering the upper surface with the top plate, there is an advantage in that assembly and transport are easy.
[49]
In another embodiment, the housing may include: a bottom plate supporting the cell stack from a lower portion; and a U-shaped frame covering the cell stack positioned on the bottom play, wherein through holes through which the reinforcing poles pass are formed on both sides of the U-shaped frame. In this case, the cell stack is positioned on the bottom plate, and a U-shaped frame covers it.
[50]
In addition, the battery module according to the present invention further includes an end plate covering the side of the U-shaped frame if necessary. In one embodiment, the battery module further includes an end plate covering any one or more of both sides of the U-shaped frame. The end plate fixes the accommodated cell stack, and an electrode lead electrically connects to the outside, for example, a bus bar is formed.
[51]
[52]
In addition, the present invention provides a battery pack including the battery module described above. In a specific example, the battery pack according to the present invention includes one or two or more battery modules. 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 is a generic term for various types of vehicles using a secondary battery as an auxiliary power source or a main power source. Specifically, the vehicle includes a hybrid (HEV), a plug-in hybrid (PHEV), or a pure electric vehicle (BEV, EV).
Modes for carrying out the invention
[53]
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.
[54]
[55]
(First embodiment)
[56]
3 is a schematic diagram of a battery cell according to an embodiment of the present invention. Referring to FIG. 3 , the battery cell 100 according to the present invention is a pouch-type battery cell 100 in which first and second electrode leads 121 and 122 are asymmetric to each other. The battery cell 100 includes a cell body 110 in which an electrode assembly is accommodated; a first electrode lead 121 protruding in one direction of the cell body 110; and a second electrode lead 122 protruding in a direction opposite to the direction in which the first electrode lead 121 of the cell body 110 is formed.
[57]
In the battery cell 100 , the first electrode lead 121 is inclined downward and the second electrode lead 122 is inclined upward, and has an asymmetric structure. Specifically, the cell body 110 has a structure in which shoulder line tolerances 112 and 113 are formed in which the height is lowered in both width directions with respect to the first electrode lead 121 . The shoulder line tolerances 112 and 113 have a structure in which the height is lowered outward from the electrode lead. For example, referring to the drawing shown in FIG. 3 , the first electrode lead 121 has a structure formed by being biased downward, and in this case, the shoulder line tolerance 112 is long formed on the upper side, so that a relatively large dead space is formed. is secured, and the shoulder line tolerance 113 is formed to be short on the lower side, so that a dead space of a narrow area is secured.
[58]
In the cell body 110 , the ratio of the width direction lengths L 1 , L 2 of the shoulder line tolerances 112 and 113 formed in both width directions with respect to the first electrode lead 121 is about 5:1. . In addition, in the cell body 110 , the ratio of the width direction length of the shoulder line tolerance formed in both width directions with respect to the second electrode lead 122 is also formed at a level of about 1:5. As described above, in the battery cell 100 according to the present invention, by forming the electrode leads 121 and 122 to be biased in one direction, a dead space of a larger area can be secured. In addition, an asymmetric structure in which the first electrode lead 121 and the second electrode lead 122 are inclined in different lateral directions is formed.
[59]
[60]
(Second embodiment)
[61]
4 is a schematic diagram showing a cross-section of a battery module according to another embodiment of the present invention. Referring to FIG. 4 , the battery module 300 according to the present invention includes a structure in which cell stacks 100 and 200 in which a plurality of battery cells are stacked are accommodated in module housings 301 and 302 . The module housing includes a U-shaped frame and a module housing upper plate 301 covering an upper surface of the U-shaped frame. In FIG. 4, only the module housing lower plate 302 is shown in the U-shaped frame for convenience of explanation.
[62]
The cell stack has a structure (not shown) in which two battery cells 100 and 200 are disposed in an x-axis direction and 24 battery cells are stacked in a y-axis direction. Accordingly, the battery module 300 accommodates 48 battery cells 100 and 200 . In FIG. 4 , in the battery cells 100 stacked on the left side, a first electrode lead 121 is formed below the left side with respect to the cell body 110 , and a second electrode lead 122 is formed above the right side of the cell body 110 . ) is formed. In addition, in the battery cells 200 stacked on the right side, the first electrode lead 221 is formed above the left side with respect to the cell body 210 , and the second electrode lead 222 is formed below the right side of the battery cell 200 . is formed
[63]
In addition, the battery module 300 has a structure including a reinforcement pole 400 penetrating between the battery cells 100 and 200 in order to reinforce the mechanical strength. The reinforcement pole 400 is disposed to penetrate the dead space between the battery cell 100 and the battery cell 200 disposed in the x-axis direction.
[64]
Specifically, in the battery module 300 , the second electrode lead 122 of the first battery cell 100 arranged in the x-axis direction and the first electrode lead 221 of the second battery cell 200 face each other It is a structure that is electrically connected in series by being contacted at a location. The first battery cell 100 is disposed with the second electrode lead 122 shifted upward, and the second battery cell 200 is disposed with the first electrode lead also shifted upward. In this case, the second electrode lead 122 of the first battery cell 100 and the first electrode lead 221 of the second battery cell 200 are electrically connected to each other while facing each other at the same height, and the lower side A large area of ​​the dead space is formed. The reinforcing pole 400 passes through the dead space.
[65]
As such, the battery module 300 according to the present invention does not require a separate additional space for forming the reinforcing pole 400 , and can realize excellent space utilization and high mechanical strength at the same time.
[66]
[67]
(Third embodiment)
[68]
5 is a schematic diagram illustrating a battery pack according to another embodiment of the present invention. Referring to FIG. 5 , the battery pack 500 according to the present invention has a structure in which two battery modules 310 and 320 are assembled. Each of the battery modules 310 and 320 includes a cell stack having a structure in which two battery cells 100 and 200 are disposed in the x-axis direction and 24 battery cells are stacked in the y-axis direction, and is disposed on the left The battery cell 100 and the battery cell 200 disposed on the right side are electrically connected in series to each other. In addition, the reinforcing pole 400 passing through the two battery modules 310 and 320 is fastened. The reinforcing pole 400 is disposed to pass through the dead space region between the battery cell 100 disposed on the left and the battery cell 200 disposed on the right, and the position is fixed by the reinforcing pole stopper 401 .
[69]
Each of the battery modules 310 and 320 has a structure in which the front and rear side surfaces and the upper surface are surrounded by a U-shaped frame. It is also possible to further include a lower plate (not shown) if necessary.
[70]
[71]
In the above, preferred embodiments of the present invention have been described with reference to the drawings, but those skilled in the art or those having ordinary knowledge in the technical field will not depart from the spirit and technical scope of the present invention described in the claims. It will be understood that various modifications and variations of the present invention can be made without departing from the scope of the present invention.
[72]
Accordingly, the technical scope of the present invention should not be limited to the content described in the detailed description of the specification, but should be defined by the claims.
[73]
[74]
[Explanation of code]
[75]
10, 100, 200: battery cell
[76]
11, 110: cell body
[77]
12, 13, 112, 113: shoulder line tolerance
[78]
21, 121, 221: first electrode lead
[79]
22, 122, 222: second electrode lead
[80]
31, 32, 33, 34, 300, 310, 320: battery module
[81]
40: reinforcement bar
[82]
50, 500: battery pack
[83]
301: module housing top plate
[84]
302: module housing lower plate
[85]
400: reinforcement pole
[86]
401: reinforcement pole stopper
[87]
L 1 , L 2 : Width direction length of shoulder line tolerance
Claims
[Claim 1]
a cell body in which the electrode assembly is accommodated; a first electrode lead protruding in one direction of the cell body; and a second electrode lead formed to protrude in a direction opposite to the direction in which the first electrode lead of the cell body is formed, wherein the first electrode lead is disposed in either side direction with respect to a central axis in the longitudinal direction of the battery cell. A dead space is formed on the other side by being biased, and the second electrode lead is biased in the opposite direction to the first electrode lead with respect to the central axis in the longitudinal direction of the battery cell to form a dead space on the other side. A pouch-type battery cell with a structure.
[Claim 2]
The pouch-type battery cell according to claim 1, wherein the cell body has a structure in which a shoulder line tolerance is formed in which the height is lowered on both sides in the width direction, respectively, based on the first and second electrode leads.
[Claim 3]
The pouch-type battery cell according to claim 2, wherein the cell body has a ratio of lengths in the width direction of shoulder line tolerances formed on both sides in the width direction with respect to the first and second electrode leads, respectively, in the range of 1:2 to 1:10.
[Claim 4]
A cell stack in which a plurality of battery cells according to claim 1 are stacked; a housing accommodating the battery cell stack; and a reinforcing pole penetrating the battery cell stack, wherein the cell stack includes m (m is an integer greater than or equal to 2) battery cells in the x-axis direction, and n in the y-axis direction ( n is an integer greater than or equal to 2) has a structure in which the battery cells are disposed, and the reinforcement pole has a structure that penetrates the dead space between the battery cells and the battery cells arranged in the x-axis direction.
[Claim 5]
According to claim 4, wherein the battery cells arranged in the x-axis direction, p-th (p is an integer between 1 and m-1) the second electrode lead of the arranged battery cell and the first electrode of the p+1-th battery cell A battery module in which the leads are electrically connected in series by contacting at positions facing each other.
[Claim 6]
According to claim 5, wherein the reinforcing pole, p-th (p is an integer between 1 to m-1) disposed battery cells and the p + 1 to pass through a dead space between the disposed battery cells Battery module characterized in that.
[Claim 7]
The battery module according to claim 4, wherein the cell stack has a structure in which 2 to 4 battery cells are arranged in an x-axis direction and 10 to 30 battery cells are arranged in a y-axis direction.
[Claim 8]
The battery module according to claim 4, wherein the housing includes a accommodating part in which the cell stack is accommodated, and both sides of the battery module have a structure in which a through hole through which a reinforcing pole passes.
[Claim 9]
The battery module according to claim 8, wherein the reinforcing pole has a circular or elliptical cross-section and includes a stopper formed on at least one of an inner side and an outer side of a hole through which the reinforcing pole formed in the housing passes.
[Claim 10]
The apparatus of claim 8, wherein the housing comprises: a U-shaped frame including a accommodating part in which the cell stack is accommodated; and a top plate covering the upper portion of the U-shaped frame, and both sides of the U-shaped frame have a structure in which through holes through which reinforcing poles pass are formed.
[Claim 11]
The apparatus of claim 8 , wherein the housing comprises: a bottom plate supporting the cell stack from a lower portion; and a U-shaped frame that covers the cell stack positioned on the bottom play, and has a structure in which through holes through which reinforcing poles pass through are formed on both sides of the U-shaped frame.
[Claim 12]
The battery module according to claim 10 or 11, further comprising an end plate covering at least one of both sides of the U-shaped frame.