Battery Module

Abstract

To provide a battery module capable of reducing resistance of a connecting portion for connecting a plurality of battery cells in series.SOLUTION: In a battery module 10 having a plurality of battery cells 34 connected in series, each battery cell 34 has a rectangular thin plate shape, and one side thereof is provided with a thin plate-shaped positive electrode tab 36 and a thin plate-shaped negative electrode tab 38. A side on which a positive electrode tab 36 and a negative electrode tab 38 of one battery cell 34 are provided, and a side on which a positive electrode tab 36 and a negative electrode tab 38 of the other battery cell 34 are provided are arranged so as to face each other. The positive electrode tab 36 of the one battery cell 34 and the negative electrode tab 38 of the other battery cell 34 are stacked in a thickness direction and come into contact with each other.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a battery module having a plurality of battery cells connected in series. [Background technology]

[0002] Patent Document 1 listed below discloses a battery module in which electrode lead terminals of adjacent flat batteries are connected to each other by an electrical conductor, connecting a plurality of flat batteries in series. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-242951 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology disclosed in Patent Document 1, the electrode lead terminals of adjacent flat batteries are connected to each other by an electrical conductor, which causes a problem of increased resistance between the electrode lead terminals.

[0005] The present invention has been made to solve the above problems, and has an object to provide a battery module that can reduce the resistance of the connection parts that connect multiple battery cells in series. [Means for solving the problem]

[0006] An aspect of the present invention is a battery module having a plurality of battery cells connected in series, each of the battery cells having a rectangular thin plate shape with thin plate-shaped positive and negative tabs provided on one side, the side on which the positive and negative tabs of one of the battery cells are provided facing the side on which the positive and negative tabs of another of the battery cells are provided, and the positive tab of one of the battery cells and the negative tab of the other of the battery cells are stacked in the thickness direction and in contact with each other. Effect of the Invention

[0007] According to the present invention, it is possible to reduce the resistance of the connection parts that connect a plurality of battery cells in series. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view of a battery module. [Diagram 2] FIG. 2 is a front view of the battery module. [Diagram 3] FIG. [Figure 4] FIG. 2 is a perspective view of the battery pack. [Diagram 5] FIG. 2 is an exploded perspective view of the battery module. [Figure 6] FIG. 2 is a perspective view showing battery cells connected in series. [Figure 7] FIG. 2 is a partial cross-sectional view of the battery module. [Figure 8] FIG. 2 is a partial cross-sectional view of the battery module. [Figure 9] FIG. 2 is a schematic diagram of a first unit, a second unit, and a water jacket. [Figure 10] FIG. 2 is a schematic cross-sectional view of a battery module. [Figure 11] FIG. 2 is a schematic diagram of a first unit, a second unit, and a water jacket. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [First embodiment] Fig. 1 is a perspective view of a battery module 10 of the present embodiment. Fig. 2 is a front view of the battery module 10. Fig. 3 is an exploded perspective view of a battery pack 26. Fig. 4 is a perspective view of the battery pack 26.

[0010] 1 and 2, the battery module 10 is formed in a plate shape. A positive electrode terminal 12 and a negative electrode terminal 14 are provided on the negative side of the battery module 10 in the Y axis direction. A water supply hole 16 and a drain hole 18 of a water jacket 48 (described later) provided in the battery module 10 are provided on the positive side of the battery module 10 in the Y axis direction.

[0011] As shown in Fig. 3, through holes 22 through which bolts 20 pass are provided at the four corners and the center of the battery module 10. Three battery modules 10 are stacked in the Z-axis direction and fastened with bolts 20 and nuts 24 to form a battery pack 26 shown in Fig. 4. The positive electrode terminals 12 and negative electrode terminals 14 of battery modules 10 adjacent to each other in the Z-axis direction are connected by a copper bus bar 28. The bus bar 28 is fixed to the positive electrode terminals 12 and negative electrode terminals 14 by screws 30. In this way, the battery modules 10 are connected in series.

[0012] 3 and 4, three battery modules 10 are stacked in the same orientation, so that the positive electrode terminals 12 and negative electrode terminals 14 of all the battery modules 10 are located on the same surface of the battery pack 26. However, the battery modules 10 may be stacked in different orientations, so that the positive electrode terminals 12 and negative electrode terminals 14 of the battery modules 10 are located on different surfaces of the battery pack 26. The positions of the positive electrode terminals 12 and negative electrode terminals 14 of the battery modules 10 in the battery pack 26 can be changed as appropriate depending on the relationship with other surrounding devices and the like at the installation location of the battery pack 26.

[0013] As shown in Fig. 3, the water supply hole 16 and the drain hole 18 of each battery module 10 are connected by an aluminum joint 32. The joint 32 is composed of a first joint 32a, a second joint 32b, and a third joint 32c. The first joint 32a is attached to the water supply hole 16 and the drain hole 18 of the battery module 10 that is most positive in the Z axis direction. The second joint 32b is attached to the water supply hole 16 and the drain hole 18 of the battery module 10 that is in the middle in the Z axis direction. The third joint 32c is attached to the water supply hole 16 and the drain hole 18 of the battery module 10 that is most negative in the Z axis direction.

[0014] Cooling water injected from the first joint 32a attached to the water supply hole 16 of the battery module 10 is supplied to the water jacket 48 of each battery module 10. Then, the cooling water that has become hot after circulating through the cooling water flow path in the water jacket 48 of each battery module 10 is discharged from the first joint 32a attached to the drain hole 18 of the battery module 10.

[0015] 5 is an exploded perspective view of the battery module 10. The battery module 10 has a first battery cell 34a, a second battery cell 34b, a third battery cell 34c, a fourth battery cell 34d, a fifth battery cell 34e, and a sixth battery cell 34f connected in series. Hereinafter, when no particular one of the first battery cell 34a, the second battery cell 34b, the third battery cell 34c, the fourth battery cell 34d, the fifth battery cell 34e, and the sixth battery cell 34f is specified, the cell will be referred to as the battery cell 34.

[0016] The battery cells 34 are laminated lithium ion secondary batteries. Each battery cell 34 is formed in a rectangular thin plate shape, and has a thin plate-shaped positive electrode tab 36 and a thin plate-shaped negative electrode tab 38 provided on one side.

[0017] The first battery cell 34a, the second battery cell 34b, and the third battery cell 34c are connected in series to form a first unit 40. The positive electrode tabs 36 and the negative electrode tabs 38 of the first battery cell 34a, the second battery cell 34b, and the third battery cell 34c are fixed to a terminal 42. The fourth battery cell 34d, the fifth battery cell 34e, and the sixth battery cell 34f are connected in series to form a second unit 44. The positive electrode tabs 36 and the negative electrode tabs 38 of the fourth battery cell 34d, the fifth battery cell 34e, and the sixth battery cell 34f are fixed to a terminal 46. The fixing of the positive electrode tabs 36 and the negative electrode tabs 38 to the terminals 42 and 46 will be described in detail later.

[0018] The first unit 40 and the second unit 44 are stacked in the thickness direction (Z-axis direction) of the battery cell 34 with a water jacket 48 and a cell holder 50 sandwiched between them. The water jacket 48 is a flat aluminum member, and resin cell holders 50 are provided on both sides of the water jacket 48 in the X-axis direction. The cell holder 50 has insulating properties, and an insulating sheet is attached to the surface of the water jacket 48. A thermal diffusion sheet 52 is provided between each battery cell 34 and the water jacket 48 and cell holder 50.

[0019] A heat insulating material 54 and a frame 56 are provided on the Z-axis direction negative side of the first unit 40 and the Z-axis direction positive side of the second unit 44. The frame 56 is made of resin having insulating properties. The heat insulating material 54 is made of resin having elasticity and insulating properties. The frame 56 on the Z-axis direction negative side and the frame 56 on the Z-axis direction positive side are fastened by bolts 57. As a result, each battery cell 34 is sandwiched between the heat insulating material 54 and the frame 56 arranged on the Z-axis direction positive side and the heat insulating material 54 and the frame 56 arranged on the Z-axis direction negative side. The heat insulating material 54 is in direct contact with each battery cell 34 in an elastically deformed state. Pressure from the heat insulating material 54 acts on each battery cell 34, and the expansion of each battery cell 34 can be suppressed. The heat insulating material 54 corresponds to the elastic member of the present invention.

[0020] 6 is a perspective view showing battery cells 34 connected in series, with the flow of charge indicated by arrows in FIG.

[0021] Of the battery cells 34 of the first unit 40, the first battery cell 34a and the third battery cell 34c are disposed on the negative side in the X-axis direction, and the second battery cell 34b is disposed on the positive side in the X-axis direction. The first battery cell 34a and the third battery cell 34c are disposed adjacent to each other in the Y-axis direction.

[0022] The first battery cell 34a and the third battery cell 34c are arranged so that the side on which the positive electrode tab 36 and the negative electrode tab 38 are provided faces the negative side in the X-axis direction. The second battery cell 34b is arranged so that the side on which the positive electrode tab 36 and the negative electrode tab 38 are provided faces the positive side in the X-axis direction. That is, the side on which the positive electrode tab 36 and the negative electrode tab 38 of the first battery cell 34a are provided and the side on which the positive electrode tab 36 and the negative electrode tab 38 of the second battery cell 34b are provided are arranged so as to face each other. Similarly, the side on which the positive electrode tab 36 and the negative electrode tab 38 of the second battery cell 34b are provided and the side on which the positive electrode tab 36 and the negative electrode tab 38 of the third battery cell 34c are provided are arranged so as to face each other.

[0023] The first battery cell 34a, the second battery cell 34b, and the third battery cell 34c are each installed such that the positive electrode tab 36 is located on the negative side in the Y axis direction, and the negative electrode tab 38 is located on the positive side in the Y axis direction. The negative electrode tab 38 of the first battery cell 34a and the positive electrode tab 36 of the second battery cell 34b are overlapped and in contact with each other in the thickness direction (Z axis direction) of the positive electrode tab 36 and the negative electrode tab 38. The negative electrode tab 38 of the second battery cell 34b and the positive electrode tab 36 of the third battery cell 34c are overlapped and in contact with each other in the thickness direction (Z axis direction) of the positive electrode tab 36 and the negative electrode tab 38.

[0024] Of the battery cells 34 of the second unit 44, the fourth battery cell 34d and the sixth battery cell 34f are disposed on the positive side in the X-axis direction, and the fifth battery cell 34e is disposed on the negative side in the X-axis direction. The fourth battery cell 34d and the sixth battery cell 34f are disposed adjacent to each other in the Y-axis direction.

[0025] The fourth battery cell 34d and the sixth battery cell 34f are arranged so that the side on which the positive electrode tab 36 and the negative electrode tab 38 are provided faces the negative side in the X-axis direction. The fifth battery cell 34e is arranged so that the side on which the positive electrode tab 36 and the negative electrode tab 38 are provided faces the positive side in the X-axis direction. That is, the side on which the positive electrode tab 36 and the negative electrode tab 38 of the fourth battery cell 34d are provided and the side on which the positive electrode tab 36 and the negative electrode tab 38 of the fifth battery cell 34e are provided are arranged so as to face each other. Similarly, the side on which the positive electrode tab 36 and the negative electrode tab 38 of the fifth battery cell 34e are provided and the side on which the positive electrode tab 36 and the negative electrode tab 38 of the sixth battery cell 34f are provided are arranged so as to face each other.

[0026] The fourth battery cell 34d, the fifth battery cell 34e, and the sixth battery cell 34f are each installed such that the positive electrode tab 36 is located on the positive side in the Y axis direction, and the negative electrode tab 38 is located on the negative side in the Y axis direction. The negative electrode tab 38 of the fourth battery cell 34d and the positive electrode tab 36 of the fifth battery cell 34e are overlapped and in contact with each other in the thickness direction (Z axis direction) of the positive electrode tab 36 and the negative electrode tab 38. The negative electrode tab 38 of the fifth battery cell 34e and the positive electrode tab 36 of the sixth battery cell 34f are overlapped and in contact with each other in the thickness direction (Z axis direction) of the positive electrode tab 36 and the negative electrode tab 38.

[0027] A copper positive electrode terminal 12 is overlapped in the Z-axis direction and in contact with the positive electrode tab 36 of the first battery cell 34a of the first unit 40. A copper negative electrode terminal 14 is overlapped in the Z-axis direction and in contact with the negative electrode tab 38 of the sixth battery cell 34f of the second unit 44.

[0028] A copper bus bar 58 is overlapped in the Z-axis direction and in contact with the negative electrode tab 38 of the third battery cell 34c of the first unit 40. A copper bus bar 60 is overlapped in the Z-axis direction and in contact with the positive electrode tab 36 of the fourth battery cell 34d of the second unit 44. The bus bar 58 and the bus bar 60 are connected by an aluminum bus block 62. This connects the first unit 40 and the second unit 44 in series. Furthermore, it is possible to adopt a structure in which the first unit 40 and the second unit 44 are folded back, and the area of ​​the battery cell 34 in the battery module 10 can be reduced.

[0029] The current input from the positive terminal 12 to the first unit 40 Positive The charge moves in the first unit 40 toward the positive side in the Y-axis direction, and moves from the first unit 40 to the second unit 44. Positive The charge moves within the second unit 44 toward the negative side in the Y-axis direction and exits from the negative electrode terminal 14.

[0030] [Fixing structure of positive and negative electrode tabs to terminals] 7 is a partial cross-sectional view of the battery module 10. FIG 7 is a cross-sectional view taken along the cross-sectional line VII-VII shown in FIG 2.

[0031] The terminals 42 and 46 are made of insulating resin. The positive electrode tabs 36 and the negative electrode tabs 38 of each battery cell 34 are inserted into the terminals 42 and 46 through slits 64 formed on both sides of the terminals 42 and 46 in the X-axis direction. Then, in the terminals 42 and 46, the positive electrode tabs 36 and the negative electrode tabs 38 of the battery cells 34 facing each other in the X-axis direction are stacked in the Z-axis direction, and the positive electrode tabs 36 and the negative electrode tabs 38 are fixed to the terminals 42 and 46 by the bolts 66. A copper plate 68 is sandwiched between the positive electrode tabs 36 or the negative electrode tabs 38 and the heads of the bolts 66.

[0032] [Battery cell cooling structure] 8 is a partial cross-sectional view of the battery module 10. FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 2. FIG. 9 is a schematic diagram of the first unit 40, the second unit 44, and the water jacket 48. In FIG. 9, the first unit 40, which is located on the opposite side of the water jacket 48 from the second unit 44, is two-point chain 9 shows a state seen from the positive side to the negative side in the Z-axis direction. FIG. 10 is a schematic cross-sectional view of the battery module 10. In FIG. 10, the flow of heat from the battery cells 34 to the water jacket 48 is shown by arrows.

[0033] 8, the water jacket 48 and the cell holder 50 are formed in a flat plate shape and are sandwiched between the first unit 40 and the second unit 44 in the Z-axis direction. The water jacket 48 is provided in the center of the battery module 10 in the Y-axis direction, and the cell holder 50 is provided on the outer side of the water jacket 48.

[0034] 9, when viewed from the Z-axis direction, the water jacket 48 is provided so as to overlap approximately half of the area on the positive electrode tab 36 and negative electrode tab 38 side of each battery cell 34 and the positive electrode tab 36 and negative electrode tab 38. The cooling water passes through the water jacket 48 through an area corresponding to approximately half of the area on the positive electrode tab 36 and negative electrode tab 38 side of each battery cell 34 and an area corresponding to each positive electrode tab 36 and negative electrode tab 38.

[0035] As described above, in this embodiment, the water jacket 48 is provided so as to overlap approximately half of the area on the positive electrode tab 36 and negative electrode tab 38 side of each battery cell 34. However, depending on the heat generation characteristics of the battery cell 34, the water jacket 48 may be provided so as to overlap two-thirds of the area on the positive electrode tab 36 and negative electrode tab 38 side of the battery cell 34, or so as to overlap the entire surface of the battery cell 34.

[0036] As shown in Fig. 8, a thermal diffusion sheet 52 is provided adjacent to the surface of each battery cell 34 facing the water jacket 48. The thermal diffusion sheet 52 is provided in close contact with the entire surface of the battery cell 34 facing the water jacket 48. The thermal diffusion sheet 52 makes it possible to transfer heat from approximately half of the area opposite the positive electrode tab 36 and negative electrode tab 38 of the battery cell 34 where the water jacket 48 is not provided, to the water jacket 48, thereby improving heat dissipation (Fig. 10).

[0037] The thermal diffusion sheet 52 is made of a resin having elasticity and insulating properties. This allows the thermal diffusion sheet 52 to absorb the tolerance in the stacking direction (Z-axis direction) of the battery cells 34. As described above, when the water jacket 48 is provided so as to overlap the entire surface of the battery cells 34, the thermal diffusion sheet 52 does not need to be provided.

[0038] [Effects] When connecting battery cells 34 in series, if the positive electrode tab 36 of one battery cell 34 and the negative electrode tab 38 of another battery cell 34 are connected via a bus bar or the like, there is a problem that the resistance between the positive electrode tab 36 of one battery cell 34 and the negative electrode tab 38 of the other battery cell 34 increases.

[0039] Therefore, in the battery module 10 of the present embodiment, the positive electrode tab 36 of the battery cell 34 and the negative electrode tab 38 of the other battery cell 34 are configured to be overlapped in the thickness direction and in contact with each other. As a result, the positive electrode tab 36 of the battery cell 34 and the negative electrode tab 38 of the other battery cell 34 are in direct contact with each other, so that the resistance between the positive electrode tab 36 of the battery cell 34 and the negative electrode tab 38 of the other battery cell 34 can be reduced.

[0040] In the battery module 10 of the present embodiment, the first battery cell 34a, the second battery cell 34b, and the third battery cell 34c of the first unit 40 are installed such that the positive electrode tab 36 is located on the negative side in the Y axis direction and the negative electrode tab 38 is located on the positive side in the Y axis direction. Furthermore, the fourth battery cell 34d, the fifth battery cell 34e, and the sixth battery cell 34f of the second unit 44 are installed such that the positive electrode tab 36 is located on the positive side in the Y axis direction and the negative electrode tab 38 is located on the negative side in the Y axis direction. The first unit 40 and the second unit 44 are stacked in the Z axis direction and connected in series. This allows the first unit 40 and the second unit 44 to have a folded-back structure, and the area of ​​the battery cell 34 in the battery module 10 can be reduced.

[0041] Furthermore, the battery module 10 of the present embodiment has the positive electrode terminal 12 and the negative electrode terminal 14 on the negative side in the Y-axis direction. This allows the positive electrode terminal 12 and the negative electrode terminal 14 to be disposed close to each other, so that the length of the bus bar 28 connecting the battery modules 10 in series can be shortened, and the resistance of the bus bar 28 can be reduced.

[0042] Moreover, the battery module 10 of the present embodiment has the water supply hole 16 and the drain hole 18 of the water jacket 48 on the positive side in the Y-axis direction. Since the water supply hole 16 and the drain hole 18 are provided on the side opposite to the positive electrode terminal 12 and the negative electrode terminal 14, the possibility of the cooling water adhering to the positive electrode terminal 12 and the negative electrode terminal 14 is reduced, and leakage and short circuit can be suppressed.

[0043] Moreover, the battery module 10 of the present embodiment has a flat water jacket 48 between the first unit 40 and the second unit 44. This water jacket 48 cools both the respective battery cells 34 of the first unit 40 and the respective battery cells 34 of the second unit 44, including the positive electrode tabs 36 and the negative electrode tabs 38. This allows the positive electrode tabs 36 and the negative electrode tabs 38, which generate a large amount of heat, and the positive electrode tabs 36 and the negative electrode tabs 38 of the battery cells 34 to be efficiently cooled.

[0044] Other Embodiments 11 is a schematic diagram of the first unit 40, the second unit 44, and the water jacket 48. In FIG. 11, the first unit 40 is located on the opposite side of the water jacket 48 from the second unit 44. two-point chain The flow of cooling water in the water jacket 48 is indicated by a line, and the flow of cooling water in the water jacket 48 is indicated by an arrow. Fig. 11 shows the state as viewed from the positive side to the negative side in the Z-axis direction.

[0045] In the first embodiment, the cooling water passes through an area in the water jacket 48 that corresponds to approximately half of the positive electrode tab 36 and negative electrode tab 38 sides of each battery cell 34, and an area that corresponds to each positive electrode tab 36 and negative electrode tab 38. Alternatively, as shown in Fig. 11, the cooling water may pass through an area in the water jacket 48 that corresponds to at least approximately half of the positive electrode tab 36 and negative electrode tab 38 sides of each battery cell 34.

[0046] Furthermore, although the battery module 10 of the first embodiment has six battery cells 34 connected in series, the battery module 10 may have two or more battery cells 34 connected in series.

[0047] Furthermore, in the battery module 10 of the first embodiment, the positive electrode tab 36 and the negative electrode tab 38 of each battery cell 34 are fixed to the terminal 42 or the terminal 46 by the bolt 66. The positive electrode tab 36 and the negative electrode tab 38 may be fixed to the terminal 42 or the terminal 46 by another method. For example, a structure for engaging an elastic member may be provided to the terminal 42 or the terminal 46, and the positive electrode tab 36 and the negative electrode tab 38 may be pressed against the terminal 42 or the terminal 46 by the elastic member, and fixed. The positive electrode tab 36 and the negative electrode tab 38 may be fixed by welding.

[0048] [Technical Idea Obtained from the Embodiments] The technical ideas that can be understood from the above-described embodiments will be described below.

[0049] A battery module (10) having a plurality of battery cells (34) connected in series, each of the battery cells has a rectangular thin plate shape and is provided with a thin plate-shaped positive electrode tab (36) and negative electrode tab (38) on one side, the battery cells are arranged so that the side on which the positive electrode tab and the negative electrode tab of one of the battery cells are provided faces the side on which the positive electrode tab and the negative electrode tab of another of the battery cells are provided, and the positive electrode tab of one of the battery cells and the negative electrode tab of the other of the battery cells are overlapped in the thickness direction and in contact with each other.

[0050] The above-mentioned battery module may include a first unit (40) in which a plurality of the battery cells are connected in series, with the positive electrode tab of each of the battery cells being located on one side of the width direction of the battery cell and the negative electrode tab being located on the other side, and a second unit (44) in which the plurality of the battery cells are connected in series, with the positive electrode tab of each of the battery cells being located on the other side and the negative electrode tab being located on the one side, wherein the first unit and the second unit are stacked in the thickness direction of the battery cells, and the negative electrode tab of the battery cell located closest to the other side of the first unit is connected to the positive electrode tab of the battery cell located closest to the other side of the second unit.

[0051] The above battery module may have a positive terminal (12) and a negative terminal (14) on the one side.

[0052] The above-mentioned battery module may include a flat water jacket (48) provided between the first unit and the second unit and having a cooling water flow path therein, and the water jacket may cool both the battery cells of the first unit and the battery cells of the second unit, including the positive electrode tabs and the negative electrode tabs.

[0053] In the above battery module, a water supply hole (16) and a drain hole (18) for the cooling water flow path may be provided on the other side.

[0054] In the above battery module, the battery cells may be sandwiched between elastic members (54) in a thickness direction of the battery cells. [Explanation of symbols]

[0055] 10... Battery module 16... Water supply hole 18…Drain hole 34…Battery cell 36…Positive electrode tab 38…Negative electrode tab 40…1st unit 44…2nd unit 48...Water jacket 54...Insulation material (elastic member)

Claims

1. A battery module having a plurality of battery cells connected in series, Each of the battery cells has a rectangular thin plate shape and is provided with a thin plate-shaped positive electrode tab and a negative electrode tab on one side, a side on which the positive electrode tab and the negative electrode tab of one of the battery cells are provided and a side on which the positive electrode tab and the negative electrode tab of the other battery cell are provided are disposed so as to face each other; The positive electrode tab of one of the battery cells and the negative electrode tab of the other of the battery cells are overlapped and in contact with each other in a thickness direction, The battery module includes: a first unit in which a plurality of the battery cells are connected in series, the positive electrode tab of each of the battery cells being located on one side in a width direction of the battery cell and the negative electrode tab being located on the other side; a second unit in which a plurality of the battery cells are connected in series, the positive electrode tab of each of the battery cells being located on the other side and the negative electrode tab being located on the one side; having The first unit and the second unit are stacked in a thickness direction of the battery cell, a battery module in which the negative electrode tab of the battery cell located closest to the other side of the first unit and the positive electrode tab of the battery cell located closest to the other side of the second unit are connected.

2. The battery module according to claim 1 , A battery module having a positive terminal and a negative terminal on the one side.

3. The battery module according to claim 1 or 2, a flat water jacket provided between the first unit and the second unit and having a cooling water flow path therein; The water jacket cools both the battery cells of the first unit and the battery cells of the second unit, including the positive electrode tabs and the negative electrode tabs.

4. The battery module according to claim 3, A battery module having a water supply hole and a drain hole for the cooling water flow path on the other side.

5. The battery module according to any one of claims 1 to 4, The battery cell is sandwiched between elastic members in a thickness direction of the battery cell.

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