Battery module

Abstract

To obtain a battery module capable of reducing a stress load of an electrode lead in a connection part between the electrode lead and a bus bar while enhancing a space efficiency in a module case.SOLUTION: In a battery module 11, a lamination body 20P constructed by alternately laminating a plurality of battery cells 20 is housed in a module case 16, and the plurality of battery cells 20 are electrically connected via a bus bar 30. Each of the battery cells 20 contains: a first electrode lead 26A that is housed in a posture where a lamination direction is a thickness direction D, and is projected to one side in a width direction W along one first side surface part 21A in the thickness direction D; and a second electrode lead 26B that is projected to the other side in the width direction W along an other second side surface part 21B in the thickness direction D, and has a symmetrical structure so that height positions of the first electrode lead 26A and the second electrode lead 26B are not different in a reverse posture that is reversed along a center line C1 in the thickness direction D and a reverse posture that is reversed along a center line C2 in the width direction W.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a battery module. [Background technology]

[0002] The following Patent Document 1 describes a stacked secondary battery in which a battery element having a substantially rectangular planar shape in which positive and negative electrodes are stacked with a separator interposed therebetween is covered with a laminate material, and a positive electrode tab and a negative electrode tab are pulled out from the opposing sides. In this stacked secondary battery, the positive electrode tab and the negative electrode tab are arranged off the center line of each pull-out side. In this way, when multiple batteries are stacked, the upper and lower tabs that are electrically connected are arranged in the same direction relative to the center line to facilitate connection, and the upper and lower tabs that are not electrically connected are arranged in different directions relative to the center line to avoid contact. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-016122 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a module in which multiple secondary batteries (battery cells) are connected to each other via bus bars, if the electrode tabs are connected to each other at multiple positions within the module case, as in Patent Document 1, taking into account the close or distant arrangement of adjacent electrode tabs, this could lead to the bus bar arrangement becoming more complex and larger, which could reduce the space efficiency within the module case.

[0005] In consideration of the above, an object of the present invention is to provide a battery module that optimizes the arrangement of bus bars and improves the space efficiency within the module case. [Means for solving the problem]

[0006] A first aspect of the battery module is a battery module in which a stack formed by stacking a plurality of battery cells on one another is housed in a module case, and the plurality of battery cells are electrically connected to each other via bus bars.The battery cells are housed in an orientation in which the stacking direction is the thickness direction, and have a first electrode lead that protrudes to one side in the width direction along a first side portion on one side of the thickness direction, and a second electrode lead that protrudes to the other side in the width direction along a second side portion on the other side of the thickness direction, forming a symmetrical structure in which the height positions of the first electrode lead and the second electrode lead do not change between an inverted orientation inverted along the center line in the thickness direction and an inverted orientation inverted along the center line in the width direction.

[0007] In the battery module of the first aspect, a stacked body formed by stacking a plurality of battery cells on one another is housed in a module case. The plurality of battery cells are electrically connected to each other via a bus bar. The battery cells are housed in an orientation in which the stacking direction is the thickness direction, and have a first electrode lead that protrudes in one direction in the width direction along a first side surface portion on one side in the thickness direction, and a second electrode lead that protrudes in the other direction in the width direction along a second side surface portion on the other side in the thickness direction. That is, in each battery cell, the first electrode lead and the second lead are set at different positions in the stacking direction.

[0008] Here, the battery cell has a symmetrical structure in which the height positions of the first electrode lead and the second electrode lead do not change when the battery cell is inverted along the center line in the thickness direction and when the battery cell is inverted along the center line in the width direction. Therefore, by storing some of the battery cells in the module case in an inverted position along the center line in the thickness direction or the center line in the width direction, it is possible to realize the adjacent arrangement of electrode leads with the same electrical polarity and the adjacent arrangement of electrode leads with different electrical polarities at the same height position within the module case. As a result, the arrangement of the bus bars can be optimized and the space efficiency within the module case can be improved.

[0009] In the battery module of the second aspect, in the first aspect, the laminate has at least one first laminate portion in which the first electrode lead and the second electrode lead are arranged in close proximity on one side of the width direction by one of the two battery cells adjacent in the stacking direction being inverted along the center line in the thickness direction.

[0010] In the battery module of the second aspect, the stack has at least one first stack section. In this first stack section, one of two battery cells adjacent in the stacking direction is inverted along the center line in the thickness direction, so that the first electrode lead and the second electrode lead are arranged close to each other on one side in the width direction. Therefore, the electrode leads with different electrical polarities can be arranged close to each other, and the series connection between the two battery cells is easily and efficiently performed via the bus bar.

[0011] In the battery module of the third aspect, in the first aspect, the stack has at least one second stack portion in which the first electrode leads or the second electrode leads are arranged in close proximity to each other on one side of the width direction, by one of the two battery cells adjacent in the stacking direction being in an inverted position inverted along the center line in the width direction.

[0012] In the battery module of the third aspect, the stack has at least one second stack section. In this second stack section, one of two battery cells adjacent in the stacking direction is inverted along the center line in the width direction, so that the first electrode lead and the second electrode lead are arranged close to each other on one side in the width direction. Therefore, the electrode leads with the same electrical polarity can be arranged close to each other, and the parallel connection between the two battery cells is easily and efficiently performed via the bus bar.

[0013] A fourth aspect of the battery module is such that, in the second aspect, the laminate has a plurality of third laminate sections formed by stacking two of the battery cells adjacent in the stacking direction in the same position, and one of the two third laminate sections adjacent in the stacking direction is inverted along the center line in the thickness direction so that the first laminate section is formed by two adjacent battery cells between the two third laminate sections, and the bus bar has at least one series connection section on one side of the width direction of the laminate that electrically connects the first electrode lead and the second electrode lead that are adjacent in series in the first laminate section.

[0014] In the battery module of the fourth aspect, the laminate has a plurality of third laminate sections formed by stacking two battery cells adjacent in the lamination direction in the same position. In addition, when two third laminate sections adjacent in the lamination direction are electrically connected in series in the laminate, one of the two third laminate sections is inverted along the center line in the thickness direction, so that a first laminate section is formed by two adjacent battery cells between the two third laminate sections. Therefore, a series connection section is formed in the bus bar on one side of the width direction of the laminate, in which the first electrode lead and the second electrode lead adjacent in the first laminate section are electrically connected in series. This allows the multiple leads to be efficiently arranged on one side of the width direction of the laminate when electrically connecting in series between the laminate sections consisting of two battery cells connected in parallel, and as a result, the series connection between the laminate sections consisting of two battery cells connected in parallel is easily and efficiently performed via the bus bar. Effect of the Invention

[0015] As described above, in the battery module according to the present invention, the arrangement of the bus bars can be optimized, and the space efficiency within the module case can be improved. [Brief description of the drawings]

[0016] [Figure 1] 1 is a schematic plan view showing a main part of a vehicle to which a battery pack according to an embodiment is applied; [Diagram 2]FIG. 1 is a schematic perspective view of a battery module according to an embodiment. [Diagram 3] FIG. 2 is a plan view of the battery module according to the embodiment with the top lid of the module case removed. [Figure 4] 3 is a schematic diagram of a battery cell accommodated in a battery module as viewed from the thickness direction. FIG. [Diagram 5] 4 is a schematic diagram of battery cells housed in a battery module as viewed from the height direction. FIG. [Figure 6] FIG. 6(A) is a schematic diagram of a first lamination portion of a laminate according to an embodiment, viewed from the height direction; FIG. 6(B) is a schematic diagram of a second lamination portion of a laminate according to an embodiment, viewed from the height direction; and FIG. 6(C) is a schematic diagram of a third lamination portion of a laminate according to an embodiment, and a series connection portion in which two adjacent third connection portions are electrically connected in series, viewed from the height direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, one embodiment of the present invention will be described with reference to Figs. 1 to 6(C).

[0018] (Overall configuration of vehicle 100) Fig. 1 is a schematic plan view showing a main part of a vehicle 100 to which a battery pack 10 according to an embodiment is applied. As shown in Fig. 1, the vehicle 100 is an electric vehicle (BEV: Battery Electric Vehicle) in which the battery pack 10 is mounted under the floor. Note that arrows UP and FR in each drawing indicate the battery pack 10 mounted under the floor. The arrows L and LH indicate the upper side in the vehicle vertical direction, the front side in the vehicle longitudinal direction, and the left side in the vehicle width direction, respectively. When the directions of front, rear, left, right, top and bottom are used in the description, they refer to the front and rear in the vehicle longitudinal direction, the left and right in the vehicle width direction, and the top and bottom in the vehicle vertical direction, unless otherwise specified.

[0019] As an example, in the vehicle 100 of this embodiment, a DC / DC converter 102, an electric compressor 104, and a PTC (Positive Temperature Coefficient) heater 106 are disposed on the vehicle front side of the battery pack 10. In addition, a motor 108, a gear box 110, an inverter 112, and a charger 114 are disposed on the vehicle rear side of the battery pack 10.

[0020] The direct current output from the battery pack 10 has its voltage adjusted by a DC / DC converter 102, and is then supplied to an electric compressor 104, a PTC heater 106, an inverter 112, etc. In addition, power is supplied to a motor 108 via the inverter 112, causing the rear wheels to rotate and causing the vehicle 100 to run.

[0021] A charging port 116 is provided on the right side at the rear of the vehicle 100, and by connecting a charging plug of an external charging device (not shown) to the charging port 116, power can be stored in the battery pack 10 via the on-board charger 114.

[0022] The arrangement and structure of each component constituting the vehicle 100 are not limited to the above-mentioned configuration. For example, the present invention may be applied to a hybrid vehicle (HV: Hybrid Vehicle) equipped with an engine or a plug-in hybrid vehicle (PHEV: Plug-in Hybrid Electric Vehicle). In addition, in the present embodiment, the vehicle is a rear-wheel drive vehicle in which the motor 108 is mounted at the rear of the vehicle, but the present invention is not limited to this. The vehicle may be a front-wheel drive vehicle in which the motor 108 is mounted at the front of the vehicle, or a pair of motors 108 may be mounted at the front and rear of the vehicle. Furthermore, the vehicle may be equipped with an in-wheel motor on each wheel.

[0023] Here, the battery pack 10 is configured to include a plurality of battery modules 11. In the embodiment, as an example, ten battery modules 11 are provided. Specifically, five battery modules 11 are arranged in the vehicle front-rear direction on the right side of the vehicle 100, and five battery modules 11 are arranged in the vehicle front-rear direction on the left side of the vehicle 100. In addition, each battery module 11 is electrically connected.

[0024] Fig. 2 is a schematic perspective view of the battery module 11. As shown in Fig. 2, the battery module 11 includes a module case 16 that forms an outer shell. The module case 16 is formed in a substantially rectangular parallelepiped shape with the vehicle width direction as the longitudinal direction. The module case 16 is made of an aluminum alloy. For example, the module case 16 is formed by joining aluminum die castings to both ends of an aluminum alloy extrusion material by laser welding or the like.

[0025] A pair of voltage terminals 12 and a connector 14 are provided at both ends of the battery module 11 in the vehicle width direction. A flexible printed circuit board 21, which will be described later, is connected to the connector 14. In addition, bus bars 30 (see FIG. 4) are welded to both ends of the battery module 11 in the vehicle width direction.

[0026] The length MW of the battery module 11 in the vehicle width direction is, for example, 350 mm to 600 mm, the length ML in the vehicle front-rear direction is, for example, 150 mm to 250 mm, and the height MH in the vehicle up-down direction is, for example, 80 mm to 110 mm.

[0027] Fig. 3 is a plan view of the battery module 11 with the top lid removed. As shown in Fig. 3, a stacked body 20P formed by stacking a plurality of battery cells 20 on one another is housed inside the module case 16. Each battery cell 20 is housed with the stacking direction being the thickness direction. In this embodiment, 24 battery cells 20 are arranged (stacked) in the vehicle front-rear direction and bonded to one another to form the stacked body 20P.

[0028] For ease of understanding, in each of Figures 3 to 5, the direction indicated by arrow W is the width direction of battery cell 20, the direction indicated by arrow H is the height direction (up and down direction) of battery cell 20, and the direction indicated by arrow D is the thickness direction of battery cell 20. The width direction of the battery case 22, which will be described later, coincides with the width direction W of the battery cells 20. The height direction of the battery case 22 coincides with the height direction H of the battery cells 20. The thickness direction of the battery case 22 coincides with the thickness direction D of the battery cells 20.

[0029] On the battery cell 20, a flexible printed circuit board (FPC) is The flexible printed circuit board 21 is formed in a strip shape with its longitudinal direction aligned with the vehicle width direction, and a thermistor 23 is provided at each end of the flexible printed circuit board 21. The thermistor 23 is not bonded to the battery cells 20, and is configured to be pressed towards the battery cells 20 by the upper lid of the battery module 11.

[0030] Furthermore, one or more cushioning materials (not shown) are housed inside the module case 16. For example, the cushioning materials are elastically deformable thin plate-like members, and are arranged between adjacent battery cells 20 with the arrangement direction of the battery cells 20 being the thickness direction. As an example in this embodiment, cushioning materials are arranged at both ends of the module case 16 in the longitudinal direction and in the central portion in the longitudinal direction.

[0031] 4 is a schematic diagram of a battery cell 20 housed in a battery module 11, viewed from a thickness direction D. As shown in FIG. 4, the battery cell 20 is formed into a long rectangular plate shape with the width direction W as the longitudinal direction, and has an exterior material 21 that forms an outer shell, and an electrode body 40 housed inside the exterior material 21.

[0032] 5 is a schematic diagram of a battery cell 20 housed in a battery module 11 as viewed from a height direction H. As shown in FIG 5, the exterior material 21 has a first side surface portion 21A that constitutes one side surface in a thickness direction D of the battery cell 20 and a second side surface portion 21B that constitutes the other side surface in the thickness direction D.

[0033] Various exterior materials can be used as the exterior material 21. For example, the exterior material 21 may be configured as a laminate film, a flat box-shaped case, or the like. The exterior material 21 may also be configured as a coating material that is coated on the electrode body 40 directly or via a coating material such as a film. In this embodiment, the battery case 22 is configured by bonding a plurality of laminate films, and the electrode body 40 is sealed by the laminate film.

[0034] The electrode body 40 is configured by laminating a positive electrode as an electrode, a negative electrode as an electrode, and a separator. The positive electrode and negative electrode of the electrode body 40 are configured of metal foil or the like, and at one side of the width direction W of the electrode body 40, the ends of the laminated multiple positive electrode sheets are collected to form a positive electrode current collector 41, which is connected to an electrode lead 26 (26A) described below (see FIG. 5). At the other side of the width direction W of the electrode body 40, the ends of the laminated multiple negative electrode sheets are collected to form a negative electrode current collector 42, which is connected to an electrode lead 26 (26B) (see FIG. 5).

[0035] The electrode leads 26 are provided so as to protrude from both ends in the width direction W of the battery cell 20 (exterior material 21). The electrode lead 26 is formed in a thin plate shape, and one end disposed inside the battery case 22 is connected to the electrode body 40. The electrode lead 26 is composed of a first electrode lead 26A connected to the positive electrode collector 41 of the electrode body 40 and a second electrode lead 26B connected to the negative electrode collector 42 of the electrode body 40. The first electrode lead 26A protrudes to one side in the width direction W along one first side surface portion 21A in the thickness direction D of the battery cell 20. The second electrode lead 26B protrudes to the other side in the width direction W along the other second side surface portion 21B in the thickness direction D. For this reason, the positions of the first electrode lead 26A and the second electrode lead 26B are arranged at different positions in the thickness direction D (stacking direction) in the battery cell 20 in a plan view seen from the height direction H.

[0036] Furthermore, the first electrode lead 26A and the second electrode lead 26B each protrude from the center position in the height direction H of the battery cell 20 (see FIG. 4). For this reason, the battery cell 20 has a symmetrical structure in which the height positions of the first electrode lead 26A and the second electrode lead 26B do not change when in an inverted position inverted along the center line C1 in the thickness direction D (see FIG. 5) and when inverted along the center line C2 in the width direction W.

[0037] The electrode leads 26 of each battery cell are welded to a bus bar 30, which will be described later, thereby electrically joining the battery cells 20 together via the bus bar 30. The electrode leads 26 are also connected to external wiring of the battery module 11 via the bus bar 30. Although any known welding method can be appropriately used to weld the electrode leads 26 and the bus bar 30, in this embodiment, the electrode leads 26 and the bus bar 30 are joined by laser welding.

[0038] The length CW1 of the battery cell 20 in the vehicle width direction is, for example, 530 mm to 600 mm, 600 mm to 700 mm, 700 mm to 800 mm, 800 to 900 mm, 1000 mm or more, the length CW2 of the region in which the electrode body is housed is, for example, 500 mm to 520 mm, 600 mm to 700 mm, 700 mm to 800 mm, 800 to 900 mm, 1000 mm or more, and the height CH of the battery cell 20 is, for example, 80 mm to 110 mm, 110 mm to 140 mm. In addition, the thickness of the battery cell 20 is 5.0 mm to 7.0 mm, 7.0 mm to 9.0 mm, 9.0 mm to 11.0 mm, and the height TH of the electrode lead (terminal) 26 is 40 mm to 50 mm, 50 mm to 60 mm, 60 mm to 70 mm.

[0039] The busbar 30 is formed in a plate shape with the width direction W of the battery cells 20 as its plate thickness direction, and extends along the stacking direction (thickness direction D) of the battery cells 20. Inside the module case 16, a plurality of busbars 30 are arranged on each of one side and the other side of the width direction W of the battery cells 20. As one example, the electrode lead 26 is inserted into a slot-shaped through hole 32 that penetrates the busbar 30 in the plate thickness direction, and is welded to the surface of the busbar 30 with the end protruding from the through hole 32 folded back towards the busbar 30. This allows welding to be performed from the outside of the width direction W of the battery cells 20, making construction easier.

[0040] The bus bar 30 is provided with a first connection portion 30A (see FIG. 6(B)) that electrically connects adjacent battery cells in parallel, and a second connection portion 30B (see FIG. 6(A)) that electrically connects the two first connection portions 30A in series.

[0041] (About the stacking method of battery cells) As described above, the battery cells 20 have a symmetrical structure in which the height positions of the first electrode lead 26A and the second electrode lead 26B do not change when the battery cells 20 are in an inverted position inverted along the center line C1 in the thickness direction D (see FIG. 5 ) and when the battery cells 20 are inverted along the center line C2 in the width direction W. Due to this symmetrical structure of the battery cells 20, the battery module 11 can accommodate some of the battery cells 20 in the module case 16 in an inverted position inverted along the center line C1 in the thickness direction D or the center line C2 in the width direction W, thereby realizing adjacent arrangement of electrode leads 26 with the same electrical polarity or adjacent arrangement of electrode leads 26 with different electrical polarities at the same height position within the module case 16.

[0042] An example of a method for stacking the battery cells 20 will be described with reference to Figures 6(A) to 6(C). Figures 6(A) to 6(C) are schematic diagrams showing a first stack section 20P1, a second stack section 20P2, and a third stack section 20P3 that can constitute all or part of the stack section 20P, assuming that the stack section 20P in the module case 16 is viewed from above. For ease of explanation, Figures 6(A) to 6(C) show a state in which adjacent battery cells 20 are spaced apart; however, in reality, the stacked battery cells 20 are in contact with each other either directly or via a cushioning material, and are constrained to each other with a predetermined constraining pressure applied along the stacking direction (thickness direction D).

[0043] FIG. 6(A) shows a first laminated section 20P1 that may constitute a part or the whole of the laminated body 20P. The first laminated section 20P1 is formed by stacking two battery cells 20 adjacent in the stacking direction in an inverted position in which one of the battery cells 20 is inverted along the center line C1 in the thickness direction D. In this first laminated section 20P1, one of the battery cells 20 is inverted, so that the first electrode lead 26A and the second electrode lead 26B are arranged close to each other on one side of the width direction W. That is, on one side of the width direction W of the first laminated section 20P1, the electrode leads 26 with different electrical polarities can be drawn out to the bus bar 30 side in a state of being arranged close to each other. In the example shown in FIG. 6(A), the adjacent battery cells 20 are connected in series via the second connection portion 30B of the bus bar 30.

[0044] 6(B) shows a second stacked section 20P2 that may constitute a part or all of the stacked body 20P. In the second stacked section 20P2, two battery cells 20 adjacent in the stacking direction are stacked in an inverted position in which one of the battery cells 20 is inverted along the center line C2 in the width direction W. In this second stacked section 20P2, the first electrode leads 26A (or the second electrode leads 26B) having the same electrical polarity can be drawn out to the bus bar 30 side on one side of the width direction W in a state in which they are arranged close to each other. In the example shown in FIG. 6(B), adjacent battery cells 20 are connected in parallel via the first connection portion 30A of the bus bar 30.

[0045] 6(C) shows a third laminated section 20P3 that may constitute all or part of the laminate 20P. In the third laminated section 20P3, two adjacent battery cells in the stacking direction are stacked in the same position. In this third laminated section 20P3, the first electrode leads 26A and the second electrode leads 26B that have the same electrical polarity are arranged at one side and the other side of the width direction W, spaced apart by the thickness of the battery cells 20.

[0046] 6(C), two third laminated portions 20P3 are adjacent to each other in the stacking direction, and one of the two third laminated portions 20P3 is stacked in an inverted position inverted along the center line C1 in the thickness direction D. Therefore, a first laminated portion 20P1 is formed by two adjacent battery cells 20 between the two third laminated portions 20P3. That is, on one side in the width direction W of the laminated body 20P, the first electrode lead 26A of the battery cell 20 constituting one of the two third laminated portions 20P3 and the second electrode lead 26B of the battery cell 20 constituting the other of the two third laminated portions 20P3 can be drawn out to the bus bar 30 side in a state of being closely arranged.

[0047] In the busbar 30, the two battery cells 20 constituting the third stacked portion 20P3 are connected in parallel via a first connection portion 30A. In addition, in the busbar 30, the two third stacked portions 20P3 are connected in series via a second connection portion 30B. In this way, the busbar 30 is formed with a series connection portion 30C that electrically connects in series the stacked portions made up of the two parallel-connected battery cells 20.

[0048] (Action and Effects) As described above, in the battery module 11 according to this embodiment, a stack 20P formed by stacking a plurality of battery cells 20 on one another is housed in a module case 16. The plurality of battery cells 20 are electrically connected to one another via a bus bar 30. The battery cells 20 are housed in a posture in which the stacking direction is the thickness direction D, and have a first electrode lead 26A that protrudes to one side in the width direction W along one first side surface portion 21A in the thickness direction D. The battery cell 20 also has a second electrode lead 26B that protrudes to the other side in the width direction W along the other second side surface portion 21B in the thickness direction D. That is, in each battery cell 20, the first electrode lead 26A and the second electrode lead 26B are set at different positions in the stacking direction.

[0049] Here, the battery cell 20 has a symmetrical structure in which the height positions of the first electrode lead 26A and the second electrode lead 26B do not change between an inverted posture inverted along the center line C1 in the thickness direction D and an inverted posture inverted along the center line C2 in the width direction W. For this reason, by accommodating some of the battery cells 20 in the module case 16 in an inverted posture along the center line C1 in the thickness direction D or the center line C2 in the width direction W, it is possible to realize adjacent arrangement of electrode leads 26 with the same electrical polarity or adjacent arrangement of electrode leads 26 with different electrical polarities at the same height position within the module case 16. As a result, the arrangement of the busbar 30 can be optimized and the space efficiency within the module case 16 can be improved.

[0050] 6(A), a part or the whole of the laminate 20P according to this embodiment may be constituted by a first laminate section 20P1. In this first laminate section 20P1, one of two battery cells 20 adjacent in the stacking direction is inverted along the center line C1 in the thickness direction D, so that the first electrode lead 26A and the second electrode lead 26B are arranged close to each other on one side in the width direction W. Therefore, the electrode leads 26 having different electrical polarities can be arranged close to each other, and the series connection between the two battery cells 20 can be easily and efficiently performed via the bus bar 30.

[0051] 6(B), a part or all of the laminate 20P according to this embodiment may be constituted by a second laminate section 20P2. In this second laminate section 20P2, one of two battery cells 20 adjacent in the stacking direction is inverted along the center line C2 in the width direction W, so that the first electrode lead 26A and the second electrode lead 26B are arranged close to each other on one side in the width direction W. Therefore, the electrode leads 26 having the same electrical polarity can be arranged close to each other, and the parallel connection between the two battery cells 20 can be easily and efficiently performed via the bus bar 30.

[0052] 6(C), a part or all of the stack 20P according to this embodiment may be constituted by a third stack section 20P3. In this third stack section 20P3, two battery cells 20 adjacent to each other in the stacking direction are stacked in the same position, so that the electrode leads 26 having the same electrical polarity can be arranged apart from each other on one side and the other side of the width direction W.

[0053] Furthermore, when two third laminated parts 20P3 adjacent to each other in the stacking direction are electrically connected in series in the laminate 20P, one of the two third laminated parts 20P3 is inverted along the center line C1 in the thickness direction D, so that a first laminated part 20P1 is formed by two adjacent battery cells 20 between the two third laminated parts 20P3. Therefore, a series connection part 30C is formed in the bus bar 30 on one side of the width direction W of the laminate 20P, in which the first electrode lead 26A and the second electrode lead 26B adjacent to each other in the first laminated part 20P1 are electrically connected in series. This makes it possible to efficiently arrange the multiple electrode leads 26 on one side of the width direction W of the laminate 20P when electrically connecting in series the laminated parts consisting of the two battery cells 20 connected in parallel. As a result, the series connection between the laminated parts consisting of the two battery cells 20 connected in parallel is easily and efficiently performed via the bus bar 30. [Explanation of symbols]

[0054] 11 Battery module 16 Module case (case) 20 Battery Cells 20P laminate 20P1 First lamination 20P2 Second lamination section 20P3 3rd lamination 21A 1st side part 21B 2nd side part 26A First Electrode Lead 26B Second electrode lead C1 Center line in thickness direction C2 Width direction center line D Thickness direction W Width direction H Height direction

Claims

1. A battery module in which a stack of a plurality of battery cells is housed in a module case, and the battery cells are electrically connected to each other via bus bars, The battery cells are housed in a position in which the stacking direction is the thickness direction, a first electrode lead protruding in one direction in a width direction along one first side surface portion in the thickness direction; a second electrode lead protruding in the other direction in the width direction along a second side surface portion in the other direction in the thickness direction, a symmetrical structure in which the height positions of the first electrode lead and the second electrode lead do not change between an inverted posture inverted along the center line in the thickness direction and an inverted posture inverted along the center line in the width direction; Battery module.

2. The laminate comprises: one of the two battery cells adjacent in the stacking direction is inverted along a center line in the thickness direction to form at least one first stacked portion in which the first electrode lead and the second electrode lead are disposed adjacent to each other on one side in the width direction; The battery module according to claim 1 .

3. The laminate comprises: one of the two battery cells adjacent in the stacking direction is inverted along a center line in the width direction to form at least one second stacked portion in which the first electrode leads or the second electrode leads are disposed adjacent to each other on one side of the width direction; The battery module according to claim 1 .

4. The laminate comprises: a plurality of third stacked sections each configured by stacking two of the battery cells adjacent to each other in the stacking direction in the same position; one of two third stacked sections adjacent to each other in the stacking direction is inverted along a center line in the thickness direction, whereby the first stacked section is formed by the two adjacent battery cells between the two third stacked sections; The bus bar is provided on one side of the width direction of the laminate. the first laminated portion has at least one series connection portion in which the first electrode lead and the second electrode lead adjacent to each other are electrically connected in series; The battery module according to claim 2 .

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