Title of Invention: Battery pack including reinforcing pole penetrating inside the battery pack and automobile including the same
technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0114882 on 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 pack including a battery cell in which an electrode lead is formed in an asymmetric structure, a reinforcing pole penetrating the inside of the battery pack, and a vehicle including the same as a power source.
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 pack using a pouch-type battery cell.
means of solving the problem
[15]
The present invention provides a battery pack including a battery cell in which an electrode lead is formed in an asymmetric structure and a reinforcing pole penetrating between the battery cell. In one example, the battery pack according to the present invention includes a pack case in which a receiving part is formed; a plurality of battery cells oriented in one direction and accommodated in the receiving portion of the pack case; and a reinforcing pole for reinforcing mechanical strength inside the pack case. The battery cell may include a cell body; and first and second electrode leads formed to protrude in opposite directions of the cell body, wherein the first and second electrode leads have opposite lateral directions with respect to a central axis in the longitudinal direction of the battery cell, respectively. It is a pouch-type battery cell having a structure formed with a bias toward , wherein the battery cell forms a cell stack block in which a plurality of battery cells are stacked (a is an integer greater than or equal to 2) in the direction in which the stored battery cells are oriented, The second electrode lead of the p-th (p is an integer between 1 and a-1) cell stack block and the first electrode lead of the p+1-th cell stack block are connected at positions facing each other. In addition, the reinforcement pole is disposed in a direction perpendicular to the direction in which the battery cells are oriented, the second electrode lead of the p-th (p is an integer between 1 and a-1) cell stack block and the p+1-th cell stack It is a structure penetrating the dead space adjacent to the structure connected between the 1st electrode leads of a sieve block.
[16]
In one example, the battery pack has a structure in which two or more battery modules are accommodated in the direction in which the stored battery cells are oriented. In addition, the reinforcing pole may include: a boundary region between a battery cell and a battery cell in the battery module; And it is disposed at any one or more positions of the boundary area between the battery module and the battery module.
[17]
In a specific example, each of the battery modules accommodated in the battery pack according to the present invention is a cell stack block in which a plurality of battery cells are stacked in the direction in which the stored battery cells are oriented, b (b is between 2 and a). integer), wherein the second electrode lead of the q-th (q is an integer between 1 and b-1) cell stack block and the first electrode lead of the q+1-th cell stack block are connected at positions facing each other structure, wherein the reinforcement pole is disposed in a direction perpendicular to the direction in which the battery cells are oriented, the second electrode lead and the q+1-th cell of the q-th (q is an integer between 1 and b-1) cell stack block It is a structure penetrating the dead space adjacent to the structure connected between the 1st electrode leads of a laminated body block.
[18]
In another specific example, the battery pack includes c battery modules (c is an integer between 2 and a) arranged in the direction in which the stored battery cells are oriented, but r-th (r is 1 to c) integer between -1) the second electrode lead at the end of the battery module and the first electrode lead at the end of the r+1-th battery module are connected at positions facing each other, and the reinforcing poles are aligned with the direction in which the battery cells are oriented. Doedoe disposed in the vertical direction, the r-th (r is an integer between 1 and c-1) dead adjacent to the structure connected between the second electrode lead of the end of the battery module and the first electrode lead of the r+1-th battery module end It is a structure that penetrates space.
[19]
In one example, the battery pack has a structure in which two or more battery modules are accommodated in a direction in which the reinforcement poles are formed, and the reinforcement poles have a structure penetrating the two or more battery modules.
[20]
In another example, the battery pack further includes a reinforcing bar disposed in a direction perpendicular to a direction in which the reinforcing pole is formed.
[21]
In a specific example, the cross-sectional shape of the reinforcing pole is a circle, an ellipse, or a triangle. In addition, the cross-sectional shape of the reinforcement bar is a rectangular or trapezoidal shape.
[22]
In one example, the battery pack includes first and second battery modules arranged in a direction perpendicular to the direction in which the stored battery cells are oriented, and the reinforcement pole has a structure in which the first and second battery modules pass through. am.
[23]
In another example, the battery pack is disposed between the first and second battery modules, and further includes a reinforcing bar positioned in a vertical direction to the reinforcing pole.
[24]
In another example, the battery pack may include first and second battery modules arranged in a direction perpendicular to the direction in which the stored battery cells are oriented; and third and fourth battery modules arranged in parallel with the first and second modules, respectively. In addition, the reinforcing pole, a position passing through the first and third battery modules; a position passing through the second and fourth battery modules; and a structure disposed at any one or more of positions passing between the first and second battery modules and between the third and fourth battery modules.
[25]
In a specific example, the battery pack further includes a reinforcing bar disposed at a position passing between the first and third battery modules and between the second and fourth battery modules.
[26]
In one example, the battery pack further includes a battery management system (BMS) located in the battery pack.
[27]
In addition, the present invention provides a vehicle including the battery pack described above as a power source.
Effects of the Invention
[28]
The battery pack according to the present invention has excellent space efficiency, can improve mechanical strength, and can be used as a power source for automobiles and the like.
Brief description of the drawing
[29]
1 is a schematic diagram showing a conventional battery cell.
[30]
2 is a schematic diagram showing a conventional battery module.
[31]
3 is a schematic diagram illustrating a battery cell according to an embodiment of the present invention.
[32]
4 is a schematic diagram showing a cross-sectional structure of a battery module according to another embodiment of the present invention.
[33]
5 is a schematic diagram illustrating the structure of a battery pack according to another embodiment of the present invention.
[34]
6 and 7 are schematic diagrams and cross-sectional views showing the structure of a battery pack according to another embodiment of the present invention.
[35]
8 and 9 are schematic diagrams and cross-sectional views showing the structure of a battery pack according to still another embodiment of the present invention.
Best mode for carrying out the invention
[36]
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
[37]
[38]
The present invention provides a battery pack in which mechanical strength is reinforced and the space for mechanical strength reinforcement is minimized. In one embodiment, a battery pack according to the present invention includes a pack case in which a receiving part is formed; a plurality of battery cells oriented in one direction and accommodated in the receiving portion of the pack case; and a reinforcing pole for reinforcing mechanical strength inside the pack case. The battery cell may include a cell body; and first and second electrode leads formed to protrude in opposite directions of the cell body, wherein the first and second electrode leads have opposite lateral directions with respect to a central axis in the longitudinal direction of the battery cell, respectively. It is a pouch-type battery cell with a structure that is biased toward
[39]
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 includes a battery cell having a novel structure that can utilize a dead space according to the formation of an electrode lead. In the pouch-type battery cell applied to the present invention, the first and second electrode leads have an asymmetric structure.
[40]
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.
[41]
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.
[42]
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. .
[43]
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.
[44]
In the battery cell, in the direction in which the stored battery cells are oriented, a number of cell stack blocks in which a plurality of battery cells are stacked (a is an integer of 2 or more) are formed, but p-th (p is between 1 and a-1) an arbitrary integer of) the second electrode lead of the cell stack block and the first electrode lead of the p+1-th cell stack block are connected at positions facing each other. In a specific embodiment, the cell stack block has a structure in which a is arranged in the x-axis direction (the direction in which the stored battery cells are oriented), among which each second electrode lead and p of the p-th arranged cell stack block Each of the first electrode leads of the +1-th cell stack block are in contact with each other at positions facing each other and are electrically connected in series. Specifically, the cell stack blocks 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 cell stack block, the second electrode lead is disposed upwards with respect to the vertically stored position, and the first electrode lead of the p+1-th cell stack block is also tilted upward. are placed In this case, the second electrode lead of the p-th cell stack block and the first electrode lead of the p+1-th cell stack block face each other at the same height, and both electrode leads are in contact to form an electrical series connection will do Wherein a is an integer of 2 or more, for example, in the range of 2 to 10.
[45]
In addition, the reinforcement pole is disposed in a direction perpendicular to the direction in which the battery cells are oriented, the p-th (p is an arbitrary integer between 1 and a-1) the second electrode lead and the p+1-th of the cell stack block It is a structure penetrating the dead space adjacent to the structure connected between the 1st electrode leads of a cell laminated body block. Specifically, below the point where the second electrode lead of the p-th cell stack block and the first electrode lead of the p+1-th cell stack block meet, the dead spaces of both cell stack blocks meet and the reinforcement pole can pass. An empty space is formed.
[46]
In one embodiment, 2 to 10 of the cell stack blocks are arranged in the x-axis direction (the direction in which the stored battery cells are oriented). In addition, each cell stacked body block has a structure in which 5 to 50 battery cells are stacked. Specifically, 2 to 4 cell stack blocks are arranged in the x-axis direction, and each cell stack block has a structure in which 10 to 30 battery cells are stacked. For example, in the battery pack according to the present invention, two battery modules are arranged in the y-axis direction (direction perpendicular to the x-axis direction), and each battery module has a cell stack block in which 24 battery cells are stacked in the x-axis direction. It may be a structure in which two are arranged. In this case, the battery pack may include two battery modules each including 48 battery cells, and may have a structure including a total of 96 battery cells.
[47]
In another embodiment, the battery pack according to the present invention has a structure in which two or more battery modules are accommodated in the direction in which the stored battery cells are oriented (x-axis direction). In addition, the reinforcing pole may include: a boundary region between a battery cell and a battery cell in the battery module; And it is disposed at any one or more positions of the boundary area between the battery module and the battery module. Specifically, the reinforcement pole includes a case located in the dead space between the battery cell and the battery cell in the battery module, or includes a case located in the dead space between the battery module and the battery module. For example, when one battery module is disposed in the x-axis direction, the battery pack includes a single reinforcing pole disposed in a dead space between a battery cell in the battery module and the battery cell. As another example, when two battery modules are arranged in the x-axis direction, one reinforcement pole is located in each battery module, and another reinforcement pole is located in the dead space between the battery module and the battery module. , the battery pack includes a total of three reinforcing poles.
[48]
In one embodiment, in the battery pack according to the present invention, each of the battery modules, in the direction in which the stored battery cells are oriented, a plurality of battery cells stacked cell stack blocks b (b is between 2 to a) an integer), wherein the second electrode lead of the q-th (q is an arbitrary integer between 1 and b-1) cell stack block and the first electrode lead of the q+1-th cell stack block face each other It is a structure connected to In addition, the reinforcement pole is disposed in a direction perpendicular to the direction in which the battery cells are oriented, the second electrode lead of the q-th (q is an integer between 1 and b-1) cell stack block and the q+1-th cell stack It is a structure penetrating the dead space adjacent to the structure connected between the 1st electrode leads of a sieve block. This embodiment shows a structure including a reinforcing pole penetrating each battery module, based on the individual battery module. In the present invention, each battery module has a structure including two or more cell stack blocks in the x-axis direction, and a reinforcing pole penetrating between the cell stack blocks. An electrical connection is made between the electrode leads between the cell stack block and the adjacent cell stack block, and due to this, the conventional battery module has a limit in that a free space for forming a reinforcement body is not secured. In the present invention, by forming the electrode leads of the pouch-type battery gel in an asymmetric structure, a sufficient dead space is secured at the connection portion between the electrode leads. Through this, the battery module according to the present invention proposes a structure including a reinforcing pole capable of increasing mechanical strength in the battery module.
[49]
In another embodiment, the battery pack includes c battery modules (c is an integer between 2 and a) arranged in the direction in which the stored battery cells are oriented, but r-th (r is 1 to c) integer between -1) The second electrode lead at the end of the battery module and the first electrode lead at the end of the r+1-th battery module are connected at positions facing each other. In addition, the reinforcement pole is disposed in a direction perpendicular to the direction in which the battery cells are oriented, the r-th (r is an integer between 1 and c-1) the second electrode lead at the end of the battery module and the r+1-th battery module end It is a structure penetrating the dead space adjacent to the structure connected between the first electrode leads of the. This embodiment shows a structure in which the battery pack includes a plurality of battery modules in one direction (x-axis direction), and includes a reinforcement pole passing between the battery module and the battery module. In the present invention, the battery pack includes two or more battery modules in the x-axis direction, and has a structure including reinforcing poles penetrating between the battery modules. An electrical connection between electrode leads is made between any one battery module and the battery module adjacent to the battery module, and thus, a separate space is required for the conventional battery pack to form a reinforcement body. In the present invention, by applying a pouch-type battery cell in which the electrode leads are formed in an asymmetric structure, a sufficient dead space is secured at the connection portion between the electrode leads between the battery module and the battery module. Through this, the battery pack according to the present invention proposes a structure including reinforcing poles that increase mechanical strength between the battery modules without occupying a separate space.
[50]
In one embodiment, the battery pack has a structure in which two or more battery modules are accommodated in a direction in which a reinforcement pole is formed, and the reinforcement pole has a structure penetrating the two or more battery modules. A direction in which the reinforcing poles are formed is a direction (y-axis direction) perpendicular to a direction in which the stored battery cells are oriented (x-axis direction). In the present invention, it includes two or more battery modules disposed parallel to each other, and the reinforcement pole has a structure penetrating two or more battery modules disposed in parallel. Through this, the mechanical strength of the battery pack in the y-axis direction may be increased.
[51]
In another embodiment, the battery pack further includes a reinforcing bar disposed in a direction perpendicular to a direction in which the reinforcing pole is formed. The battery pack includes two or more battery modules disposed parallel to each other, and a reinforcement bar disposed in the y-axis direction between the battery module and the battery module disposed in parallel. By forming the reinforcement bar, it is possible to increase the mechanical strength of the battery pack in the x-axis direction.
[52]
In one embodiment, the cross-sectional shape of the reinforcing pole is circular, oval or triangular. This can effectively penetrate the dead space formed adjacent to the connection portion between the electrode leads of the battery cell, compared to the case of having a simple rectangular cross-sectional structure. For example, the cross-sectional shape of the reinforcing pole is circular. In addition, the cross-sectional shape of the reinforcing bar is not particularly limited, but has a rectangular or trapezoidal shape. The reinforcing bar is disposed in parallel between the battery module and the battery module. For example, by forming the reinforcing bar to have a rectangular cross-sectional shape, it is possible to induce an improvement in mechanical strength and prevent a play from occurring at the corresponding position.
[53]
In a specific embodiment, the battery pack includes first and second battery modules arranged in a direction perpendicular to the direction in which the stored battery cells are oriented, and the reinforcing poles penetrate the first and second battery modules. am. For example, the battery pack has a structure in which two battery modules are disposed in a y-axis direction, and the reinforcement pole passes through the two battery modules. In a specific embodiment, the battery pack further includes a reinforcement bar disposed between the first and second battery modules and positioned in a direction perpendicular to the reinforcement pole. The reinforcing bar is a structure oriented in the y-axis direction, and is a structure disposed between the first and second battery modules. For example, the battery pack includes two battery modules, and the two battery modules are arranged parallel to each other.
[54]
In another specific embodiment, the battery pack includes first and second battery modules arranged in a direction perpendicular to the direction in which the stored battery cells are oriented; and third and fourth battery modules arranged in parallel with the first and second modules, respectively. The reinforcing pole is a position passing through the first and third battery modules; a position passing through the second and fourth battery modules; and a structure disposed at any one or more of positions passing between the first and second battery modules and between the third and fourth battery modules. For example, the battery pack has a structure in which two battery modules are arranged in an x-axis direction and two battery modules are arranged in a y-axis direction, so that a total of four battery modules are arranged. In this case, in the battery pack, two reinforcing poles passing through the battery module in the y-axis direction are positioned, and one reinforcing pole penetrating between the battery module and the battery module in the y-axis direction is positioned. In a specific embodiment, the battery pack further includes a reinforcing bar disposed at a position passing between the first and third battery modules and between the second and fourth battery modules. Accordingly, the battery pack includes three reinforcing poles for reinforcing mechanical strength in the y-axis direction and one reinforcing bar for reinforcing mechanical strength in the x-axis direction.
[55]
If necessary, the battery pack further includes a battery management system (BMS) located in the battery pack.
[56]
In addition, the battery pack according to the present invention can be applied 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
[57]
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.
[58]
[59]
(First embodiment)
[60]
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.
[61]
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 111 and 112 are formed in which the height is lowered in both width directions with respect to the first electrode lead 121 . The shoulder line tolerances 111 and 112 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 111 is long formed on the upper side, so that a relatively large dead space is formed. is secured, and the shoulder line tolerance 112 is formed to be short on the lower side, so that a dead space of a narrow area is secured.
[62]
In the cell body 110 , the ratio of the width direction lengths L 1 , L 2 of the shoulder line tolerances 111 and 112 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.
[63]
[64]
(Second embodiment)
[65]
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 200 according to the present invention includes a structure in which cell stacks 210 and 220 in which a plurality of battery cells are stacked are accommodated in module housings 201 and 202 . The module housing includes a U-shaped frame 202 (a side portion omitted) and a module housing upper plate 201 covering an upper surface of the U-shaped frame 202 . In FIG. 4 , only the module housing lower plate 202 is shown among the U-shaped frame 202 for convenience of description.
[66]
In the battery module 200, two cell stacks 210 and 220 are disposed in the x-axis direction, and each cell stack 210, 220 has a structure in which 24 battery cells are stacked in the y-axis direction (not shown). city) is Accordingly, the battery module 200 accommodates 48 battery cells. In FIG. 4 , in the cell stack 210 formed on the left side, with respect to the cell body 211 , the first electrode lead 212 is formed below the left side, and the second electrode lead 213 is above the right side of the cell body 211 . ) is formed. In addition, in the cell stack 220 formed on the right side, the first electrode lead 222 is formed on the upper left side with respect to the cell body 221 , and the second electrode lead 223 is formed on the lower side of the right side with respect to the cell body 221 . do.
[67]
In addition, the battery module 200 has a structure including a reinforcing pole 230 penetrating between the cell stacks 210 and 220 in order to reinforce the mechanical strength. The reinforcing pole 230 is disposed to penetrate the dead space between the cell stack 210 and the cell stack 220 disposed in the x-axis direction. Specifically, in the battery module 200 , the second electrode lead 213 of the left cell stack 210 and the first electrode lead 222 of the right cell stack 220 arranged in the x-axis direction are mutually It is a structure electrically connected in series by being contacted at opposite positions. In the left cell stack 210 , the second electrode lead 213 is disposed to be biased upward, and the first electrode lead of the right cell stack 220 is also disposed to be tilted upward. In this case, the second electrode lead 213 of the left cell stack 210 and the first electrode lead 222 of the right cell stack 220 are electrically connected while facing each other at the same height and facing each other, and the A large area of ​​dead space is formed at the bottom. The reinforcing pole 230 passes through the dead space.
[68]
As such, the battery module 200 according to the present invention does not require a separate additional space for forming the reinforcing pole 230, and can realize excellent space utilization and high mechanical strength at the same time.
[69]
[70]
(Third embodiment)
[71]
5 is a schematic diagram illustrating a battery pack according to another embodiment of the present invention. Referring to FIG. 5 , the battery pack 300 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 has a structure in which two cell stacks 311 and 312 are disposed in the x-axis direction, and each cell stack 311 and 312 has a structure in which 24 battery cells are stacked in the y-axis direction. . In addition, the cell stack 311 disposed on the left and the cell stack 312 disposed on the right have a structure in which respective battery cells are electrically connected in series to each other. In addition, in the battery pack 300 , the reinforcing pole 330 passes through the dead space region between the cell stack 311 disposed on the left and the cell stack 312 disposed on the right, but in the y-axis direction. It is arranged to penetrate through the two arranged battery modules (310, 320). The position of the reinforcement pole 330 is fixed by the reinforcement pole stopper 331 .
[72]
In addition, 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.
[73]
[74]
(Fourth embodiment)
[75]
6 and 7 are schematic diagrams illustrating a battery pack according to an embodiment of the present invention. Referring to FIG. 6 , the battery pack 400 according to the present invention includes first and second battery modules 410 and 420 arranged in parallel with each other in a pack case 401 , and a BMS is formed on one side. . Specifically, the first battery module 410 shown at the bottom of FIG. 6 includes a structure in which two cell stacks 411 and 412 are arranged in the x-axis direction. In the first battery module 410, two cell stacks 411 and 412 are disposed in the x-axis direction, and the cell stacks 411 and 412 each include 24 battery cells. In addition, the electrode lead of the battery cell forming the cell stack 411 on the left has a structure electrically connected in series with the electrode lead of the battery cell forming the cell stack 412 on the right side. The second battery module 420 shown at the top of FIG. 6 is also formed in the same structure.
[76]
In addition, a reinforcing pole 430 passes through the dead space between the cell stacks 411 and 412 of the first battery module 410, and the reinforcing pole 430 includes the first and second battery modules 410 and 420. It is a structure that penetrates all The first and second battery modules 410 and 420 have a structure arranged parallel to each other, and a reinforcing bar 440 is positioned therebetween. The reinforcement pole 430 serves to reinforce the mechanical strength of the battery pack in the x-axis direction, and the reinforcement bar 440 serves to reinforce the mechanical strength of the battery pack in the y-axis direction.
[77]
FIG. 7 illustrates a cross-sectional structure of the battery pack shown in FIG. 6 . Referring to FIG. 7 , based on the first battery module 410 accommodated in the pack case 401, two cell stacks 411 and 412 are disposed in the x-axis direction and are electrically connected in series to each other. . A reinforcing pole 330 is disposed through the dead space between the two cell stacks 411 and 412 . In addition, a Battery Management System (BMS) is located on the right side of the inside of the battery pack 400 . If necessary, pack terminals 403 and 404 for electrical connection to the outside may be formed on left and right sides of the battery pack 401 , respectively.
[78]
[79]
(fifth embodiment)
[80]
8 and 9 are schematic diagrams illustrating a battery pack according to still another embodiment of the present invention. Referring to FIG. 8 , the battery pack 500 according to the present invention has a structure in which four battery modules 510 , 520 , 530 , and 540 are accommodated in a 2x2 form in a pack case 501 . The first and second battery modules 510 and 520 are electrically connected to each other in series, and the third and fourth battery modules 530 and 540 are electrically connected to each other in series. In addition, the first and second battery modules 510 and 520 and the third and fourth battery modules 530 and 540 are arranged parallel to each other. In each of the four battery modules 510 , 520 , 530 , and 540 , two cell stacks are accommodated in the x-axis direction, and each cell stack has a structure in which 24 battery cells are stacked.
[81]
Specifically, the battery pack 500 is positioned through the first and third battery modules (510, 530); a position passing through the second and fourth battery modules (520, 540); and reinforcing poles 531 , 532 , and 533 are respectively positioned at positions passing between the first and second battery modules 510 and 520 and between the third and fourth battery modules 530 and 540 . In addition, the reinforcing bar 550 is disposed at a position passing between the first and third battery modules 510 and 530 and between the second and fourth battery modules 520 and 540 .
[82]
In addition, the BMS 502 is positioned inside the pack case 501 of the battery pack 500 .
[83]
9 illustrates a cross-sectional structure of the battery pack shown in FIG. 8 . Referring to FIG. 9 , the battery pack 500 includes first and second battery modules 510 and 520 accommodated in the pack case 501 in the x-axis direction. The first battery module includes two cell stacks 511 and 512 , and the second battery module includes two cell stacks 521 and 522 . A reinforcing pole 531 is positioned in the dead space between the two cell stacks 511 and 512 in the first battery module 510 , and between the two cell stacks 521 and 522 in the first battery module 520 . Reinforcement pole 533 is also located in the dead space of. In addition, the reinforcing pole 532 is also located in the dead space between the first battery module 510 and the second battery module 520 .
[84]
[85]
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.
[86]
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.
[87]
[88]
[Explanation of code]
[89]
10, 100: battery cell
[90]
210, 220, 311, 312, 411, 412, 511, 512, 521, 522: cell stack
[91]
11, 110, 211, 221: cell body
[92]
12, 13, 111, 112: shoulder line tolerance
[93]
21, 121, 221: first electrode lead
[94]
22, 122, 222: second electrode lead
[95]
31, 32, 33, 34, 200, 310, 320, 410, 420, 510, 520, 530, 540: battery module
[96]
40, 440, 550: reinforcement bar
[97]
50, 300, 400, 500: battery pack
[98]
301: module housing upper plate
[99]
302: module housing lower plate
[100]
230, 330, 430, 531, 532, 533: reinforcement poles
[101]
331: reinforcement pole stopper
[102]
401, 501: pack case
[103]
402, 502: BMS
[104]
403, 404, 503, 504: pack terminal
Claims
[Claim 1]
a pack case in which a receiving part is formed; a plurality of battery cells oriented in one direction and accommodated in the receiving portion of the pack case; and a reinforcing pole for reinforcing mechanical strength inside the pack case, wherein the battery cell includes: a cell body; and first and second electrode leads formed to protrude in opposite directions of the cell body, wherein the first and second electrode leads have opposite lateral directions with respect to a central axis in the longitudinal direction of the battery cell, respectively. It is a pouch-type battery cell having a structure formed with a bias toward , wherein the battery cell forms a cell stack block in which a plurality of battery cells are stacked (a is an integer greater than or equal to 2) in the direction in which the stored battery cells are oriented, The second electrode lead of the p-th (p is an integer between 1 and a-1) cell stack block and the first electrode lead of the p+1-th cell stack block are connected at positions facing each other, and the reinforcement The poles are disposed in a direction perpendicular to the direction in which the battery cells are oriented, and the second electrode lead of the p-th (p is an integer between 1 and a-1) cell stack block and the p+1-th cell stack block 1 A battery pack having a structure penetrating a dead space adjacent to a structure connected between electrode leads.
[Claim 2]
According to claim 1, wherein the battery pack has a structure in which two or more battery modules are accommodated in the direction in which the stored battery cells are oriented, the reinforcement pole, a boundary area between the battery cells and the battery cells in the battery module; And Battery pack, characterized in that disposed in any one or more positions of the boundary area between the battery module and the battery module.
[Claim 3]
According to claim 1, wherein each of the battery modules, in the direction in which the stored battery cells are oriented, including a plurality of battery cells stacked cell stack blocks b (b is an integer between 2 and a), including, but q-th (q is an integer between 1 and b-1) The second electrode lead of the cell stack block and the first electrode lead of the q+1-th cell stack block are connected at positions facing each other, and the reinforcing pole is , doedoe arranged in a direction perpendicular to the direction in which the battery cells are oriented, the second electrode lead of the q-th (q is an integer between 1 and b-1) cell stack block and the first electrode of the q+1-th cell stack block A battery pack having a structure penetrating a dead space adjacent to a structure connected between leads.
[Claim 4]
The battery pack according to claim 1, wherein the battery pack includes c battery modules (c is an integer between 2 and a) arranged in the direction in which the stored battery cells are oriented, but r-th (r is 1 to c-1) integer between) the second electrode lead at the end of the battery module and the first electrode lead at the end of the r+1-th battery module are connected at positions facing each other, and the reinforcing pole is in a direction perpendicular to the direction in which the battery cells are oriented a dead space adjacent to the structure connected between the second electrode lead at the end of the r-th (r is an integer between 1 and c-1) and the first electrode lead at the end of the r+1-th battery module A battery pack with a penetrating structure.
[Claim 5]
The battery pack according to claim 1, wherein the battery pack has a structure in which two or more battery modules are accommodated in a direction in which the reinforcement poles are formed, and the reinforcement poles have a structure penetrating the two or more battery modules.
[Claim 6]
The battery pack according to claim 1, wherein the battery pack further comprises a reinforcing bar disposed in a direction perpendicular to a direction in which the reinforcing poles are formed.
[Claim 7]
The battery pack according to claim 6, wherein a cross-sectional shape of the reinforcing pole is a circle, an ellipse, or a triangle, and a cross-sectional shape of the reinforcing bar is a square or trapezoidal shape.
[Claim 8]
The method according to claim 1, wherein the battery pack includes first and second battery modules arranged in a direction perpendicular to the direction in which the stored battery cells are oriented, and the reinforcement pole passes through the first and second battery modules. A battery pack that is a structure.
[Claim 9]
The battery pack according to claim 8, wherein the battery pack further comprises a reinforcement bar disposed between the first and second battery modules and positioned in a vertical direction to the reinforcement pole.
[Claim 10]
The battery pack according to claim 1, wherein the battery pack comprises: first and second battery modules arranged in a direction perpendicular to the direction in which the stored battery cells are oriented; and third and fourth battery modules arranged in parallel with the first and second modules, respectively, wherein the reinforcing poles are positioned through the first and third battery modules; a position passing through the second and fourth battery modules; and a battery pack having a structure disposed at any one or more of positions passing between the first and second battery modules and between the third and fourth battery modules.
[Claim 11]
The battery pack according to claim 9, wherein the battery pack further comprises a reinforcement bar disposed at a position passing between the first and third battery modules and between the second and fourth battery modules.
[Claim 12]
The battery pack according to claim 9, wherein the battery pack further comprises a Battery Management System (BMS) located in the battery pack.
[Claim 13]
A vehicle comprising the battery pack according to claim 1 as a power source.