Battery pack

Abstract

To provide a battery pack in which a bus bar module can be precisely positioned also in a Cell-to-Pack structure.SOLUTION: At least one of a first bus bar module and a second bus bar module has a positioning mechanism that is inserted between a first stack and a second stack and that positions the first bus bar module or the second bus bar module in a direction (second direction) orthogonal to a stacking direction (first direction) of battery cells.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] This technology relates to a battery pack.

Background Art

[0002] Chinese Utility Model Patent No. 217468616 (Patent Document 1) discloses a Cell-to-Pack structure in which a laminate including a plurality of battery cells is directly housed in a case without using an end plate and a bind bar (module structure) for restraining the plurality of battery cells.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a structure in which a bus bar module obtained by housing a plurality of bus bars in a plate member and modularizing is mounted on a laminate of a plurality of battery cells, when positioning the bus bar module, in a module structure, for example, a bind bar can be used as a fixing portion for positioning. However, in a Cell-to-Pack structure, since there is no bind bar, a mechanism different from that of a battery pack having a module structure is required.

[0005] An object of this technology is to provide a battery pack capable of accurately positioning a bus bar module even in a Cell-to-Pack structure.

Means for Solving the Problems

[0006] This technology provides the following battery pack.

[0007] [1]A first laminate including a plurality of first battery cells arranged in a first direction, a second laminate adjacent to the first laminate in a second direction orthogonal to the first direction and including a plurality of second battery cells arranged in the first direction, a case having side walls facing the first laminate and the second laminate from the first direction and housing the first laminate and the second laminate, a first bus bar electrically connecting the plurality of first battery cells, and a first plate member housing the first bus bar, a first bus bar module disposed on the first laminate, a second bus bar electrically connecting the plurality of second battery cells, and a second plate member housing the second bus bar, a second bus bar module disposed on the second laminate, wherein at least one of the first bus bar module and the second bus bar module has a first positioning mechanism for positioning the first bus bar module or the second bus bar module in the second direction at a portion inserted between the first laminate and the second laminate. A battery pack.

[0008] [2]The inserted portion of the first positioning mechanism is press-fitted between the first laminate and the second laminate. The battery pack according to [1].

[0009] [3]The inserted portion of the first positioning mechanism has a shape that is asymmetric left and right when viewed from the first direction. The battery pack according to [1] or [2].

[0010] [4]The inserted portion of the first positioning mechanism has a thick portion and a thin portion. The battery pack according to [3].

[0011] [5]The first plate member includes a first convex portion protruding toward the second laminate along the second direction from an end face of the first plate member, and a bottom portion of the first convex portion abuts at least one of the plurality of first battery cells and at least one of the plurality of second battery cells. The battery pack according to any one of [1] to [4].

[0012] [6] The second plate member includes a second convex portion that protrudes toward the first laminate side along a second direction from an end face of the second plate member, and a bottom portion of the second convex portion abuts at least one of the plurality of first battery cells and at least one of the plurality of second battery cells. The battery pack according to [5].

[0013] [7] The plurality of first battery cells each have an upper surface facing the first plate member. The first plate member has a bottom surface facing the upper surfaces of the plurality of first battery cells. A protruding rib that protrudes from the bottom surface of the first plate member toward the upper surfaces of the plurality of first battery cells is provided on a part of the bottom surface of the first plate member, and the protruding rib abuts the upper surfaces of the plurality of first battery cells. The battery pack according to any one of [1] to [6].

[0014] [8] The first plate member and the second plate member each have a second positioning mechanism that positions the first bus bar module and the second bus bar module in the first direction by biasing the side wall of the case. The battery pack according to any one of [1] to [7].

Advantages of the Invention

[0015] According to the present technology, by providing a positioning mechanism that is inserted between two laminates and positions the bus bar module in a direction (second direction) orthogonal to the lamination direction, it is possible to accurately position the bus bar module even in a Cell-to-Pack structure in which a laminate including a plurality of battery cells is directly housed in a case. A battery pack can be provided.

Brief Description of the Drawings

[0016]

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Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present technology will be described. In addition, the same or corresponding parts may be denoted by the same reference numerals, and the description thereof may not be repeated.

[0018] In the embodiments described below, when referring to the number, quantity, etc., unless otherwise specified, the scope of the present technology is not necessarily limited to such number, quantity, etc. Also, in the following embodiments, each component is not necessarily essential to the present technology, unless otherwise specified. Further, the present technology is not limited to necessarily achieving all the effects described in this embodiment.

[0019] In this specification, the descriptions of "comprise", "include", and "have" are in an open - ended form. That is, when including a certain configuration, other configurations outside of that configuration may or may not be included.

[0020] Also, in this specification, when geometric terms and terms representing positional and directional relationships, such as "parallel", "orthogonal", "diagonal 45°", "coaxial", "along", etc. are used, these terms allow for manufacturing errors or slight variations. When terms representing relative positional relationships such as "upper side", "lower side", etc. are used in this specification, these terms are used to indicate the relative positional relationship in one state, and depending on the installation direction of each mechanism (for example, flipping the entire mechanism upside down, etc.), the relative positional relationship can be reversed or rotated at an arbitrary angle.

[0021] In this specification, "battery" is not limited to lithium - ion batteries and may include other batteries such as nickel - metal hydride batteries and sodium - ion batteries. In this specification, "battery pack" can be mounted on hybrid electric vehicles (HEV), plug - in hybrid electric vehicles (PHEV), and battery electric vehicles (BEV), etc. However, the use of "battery cell" is not limited to in - vehicle use.

[0022] FIG. 1 is an exploded perspective view of the battery pack 1. As shown in FIG. 1, the battery pack 1 includes a laminate 10 including a plurality of battery cells 100 (see FIG. 2) arranged in the Y-axis direction (first direction), a case 20 that houses the laminate 10, and a bus bar module 30 disposed on the laminate 10.

[0023] The laminate 10 includes a laminate 10A (first laminate), a laminate 10B (second laminate), and a laminate 10C (third laminate). The laminates 10A and 10B are adjacent to each other in the X-axis direction (second direction). The laminates 10B and 10C are adjacent to each other in the X-axis direction.

[0024] The case 20 has side walls 21 that face the laminates 10A, 10B, and 10C from the Y-axis direction. The side walls 21 directly support the laminates 10A, 10B, and 10C from both sides in the Y-axis direction. Thus, the battery pack 1 according to the present embodiment adopts a Cell-to-Pack structure in which the laminate 10 including a plurality of battery cells 100 is directly housed in the case.

[0025] The bus bar module 30 includes a bus bar module 30A (first bus bar module) disposed on the laminate 10A, a bus bar module 30B (second bus bar module) disposed on the laminate 10B, and a bus bar module 30C (third bus bar module) disposed on the laminate 10C.

[0026] FIG. 2 is a perspective view showing the configuration of the battery cells 100 that constitute the laminates 10A, 10B, and 10C. As shown in FIG. 2, the battery cell 100 has a rectangular shape. The battery cell 100 has an electrode terminal 110, a housing 120, and a gas discharge valve 130.

[0027] The electrode terminal 110 is formed on the housing 120. The electrode terminal 110 has a positive electrode terminal 111 and a negative electrode terminal 112 as two electrode terminals 110 arranged along the X-axis direction (second direction) orthogonal to the Y-axis direction (first direction). The positive electrode terminal 111 and the negative electrode terminal 112 are provided apart from each other in the X-axis direction.

[0028] The housing 120 has a substantially rectangular parallelepiped shape. An electrode body and an electrolytic solution (not shown) are housed in the housing 120. The housing 120 has an upper surface 121, a lower surface 122, a first side surface 123, a second side surface 124, and a third side surface 125.

[0029] The upper surface 121 is a plane orthogonal to the Z-axis direction. The electrode terminal 110 is disposed on the upper surface 121. The lower surface 122 faces the upper surface 121 along the Z-axis direction (the third direction) orthogonal to the Y-axis direction (the first direction) and the X-axis direction (the second direction).

[0030] Each of the first side surface 123 and the second side surface 124 is composed of a plane orthogonal to the Y-axis direction. Each of the first side surface 123 and the second side surface 124 has the largest area among the plurality of side surfaces of the housing 120. Each of the first side surface 123 and the second side surface 124 has a rectangular shape when viewed in the Y-axis direction. Each of the first side surface 123 and the second side surface 124 has a rectangular shape in which the X-axis direction is the longitudinal direction and the Z-axis direction is the short-side direction when viewed in the Y-axis direction.

[0031] The plurality of battery cells 100 are stacked such that the first side surfaces 123 face each other and the second side surfaces 124 face each other between the battery cells 100 adjacent to each other in the Y-axis direction. Thereby, in the Y-axis direction in which the plurality of battery cells 100 are stacked, the positive electrode terminals 111 and the negative electrode terminals 112 are arranged alternately.

[0032] The gas discharge valve 130 is provided on the upper surface 121. The gas discharge valve 130 opens when the internal pressure of the housing 120 rises to a predetermined value or more due to the gas generated inside the housing 120, and discharges the gas to the outside of the housing 120.

[0033] Next, the basic configuration of the bus bar module 30 will be described with reference to FIGS. 3 and 4. FIG. 3 is a top view of the plate member 310 included in the bus bar module 30. FIG. 4 is a perspective view showing the structure around the bus bar 320 in the bus bar module 30.

[0034] Bus bar modules 30A, 30B, and 30C each include a plate member 310 shown in FIG. 3. As shown in FIG. 3, the plate member 310 includes an end face 311 located at an end in the Y-axis direction, an end face 312 located at an end in the X-axis direction, a through hole 313 formed at a position corresponding to the gas discharge valve 130 of the battery cell 100, and a wall portion 314 that partitions the space on the plate member 310 into a plurality of parts.

[0035] As shown in FIG. 4, a bus bar 320 is housed in each space partitioned by the wall portion 314. The bus bar 320 is made of a conductor (typically, a metal member). The bus bar 320 electrically connects the electrode terminals 110 of a plurality of battery cells 100 to each other. The bus bar 320 includes a base portion 321 extending in the Y-axis direction, and a connection portion 322 (first connection portion) and a connection portion 323 (second connection portion) protruding from the base portion 321 in the X-axis direction. The connection portions 322 and 323 are respectively connected to the electrode terminals 110 of two adjacent battery cells 100 in the Y-axis direction.

[0036] The wall portion 314 of the plate member 310 includes a first portion 314A, a second portion 314B, and a third portion 314C. The first portion 314A and the second portion 314B are formed to extend in the X-axis direction. The first portion 314A and the second portion 314B are located at positions spaced apart from each other in the Y-axis direction. The third portion 314C connects the first portion 314A and the second portion 314B.

[0037] Ribs 315 and locks 316 are formed on the wall portion 314. The ribs 315 protrude from both sides in the Y-axis direction from a position adjacent to the third portion 314C of the wall portion 314. The ribs 315 position adjacent bus bars 320 in the Y-axis direction. The locks 316 lock the bus bar 320 from the Z-axis direction. The shape or arrangement of the ribs 315 and the locks 316 is not limited to that shown in FIG. 4 and can be changed as appropriate.

[0038] The bus bar 320 is connected to the wiring 410. The wiring 410 is fixed to the bus bar 320 by a screw 420. The modes of the wiring 410 and the screw 420 are not limited to those shown in FIG. 4, and for example, the wiring may be constituted by a flexible printed circuit board.

[0039] The electrode terminal 110 of the battery cell 100 and the bus bar 320 are welded together after being positioned relative to each other in the X-axis direction and the Y-axis direction. By accurately performing this positioning, the welding process between the electrode terminal 110 and the bus bar 320 can be carried out with high efficiency and high quality. When the bus bar 320 is housed in the space partitioned by the wall portion 314, it is accurately positioned relative to the plate member 310 in the X-axis direction and the Y-axis direction. Therefore, it is required to accurately position the plate member 310 and the laminate 10.

[0040] With reference to FIGS. 5 to 8, the positioning mechanism of the bus bar module 30 (plate member 310) in the present embodiment will be described.

[0041] FIG. 5 is a diagram showing the positioning mechanism of the bus bar module 30 in the Y-axis direction. As shown in FIG. 5, the plate member 310 of the bus bar module 30 has a positioning mechanism 317 that positions the bus bar module 30 in the Y-axis direction by urging the side wall 21 of the case 20.

[0042] The positioning mechanism 317 shown in FIG. 5 is constituted by snap-fit-shaped protrusions formed on the end face 311 of the plate member 310. The protrusions constituting the positioning mechanism 317 protrude from the end face 311 of the plate member 310 toward the side wall 21. When the plate member 310 is installed in the case 20, the positioning mechanism 317 presses the side wall 21 of the case 20 and biases the plate member 310 toward a predetermined position. As a result, the bus bar module 30 is positioned in the Y-axis direction.

[0043] The positioning mechanism 317 may be provided on the end faces 311 on both sides of the plate member 310 in the Y-axis direction, or may be provided only on the end face 311 on one side of the plate member 310 in the Y-axis direction. When the positioning mechanisms 317 are provided on both sides in the Y-axis direction, the plate member 310 is biased toward the center of the case 20 in the Y-axis direction and is positioned at a position where the biasing forces of the positioning mechanisms 317 on both sides are balanced. When the positioning mechanism 317 is provided on one side in the Y-axis direction, the plate member 310 is biased toward the side wall 21 on the side opposite to the side where the positioning mechanism 317 is provided and is positioned with the side wall 21 as a reference plane.

[0044] The protrusion constituting the positioning mechanism 317 deforms toward the center side of the laminate 10 as a reaction force for pressing the side wall 21 of the case 20. At this time, it is preferable that the positioning mechanism 317 is located at a position where it does not interfere with the gas discharge valve 130 when viewed from the Z-axis direction. By doing so, the positioning of the bus bar module 30 in the Y-axis direction can be performed without affecting the discharge of gas from the gas discharge valve 130 of the battery cell 100 located at the end in the Y-axis direction.

[0045] FIG. 6 is a perspective view showing the structure between the bus bar module 30 and the upper surface 121 of the battery cell 100.

[0046] As shown in FIG. 6, the laminate 10 includes a separator 11 provided between a plurality of battery cells 100. The separator 11 may be a film or a tape that covers the first side surface 123, the second side surface 124, and the third side surface 125 of the battery cell 100. The separator 11 may be a film that wraps the housing 120. The separator 11 may be a plate-like member (plate) sandwiched between adjacent battery cells 100. The separator 11 can also be configured by combining the above film or tape and the plate-like member. The separator 11 has a protruding portion 11A that protrudes toward the plate member 310 side from the plurality of battery cells 100. The plate member 310 has a recess 318 that avoids the protruding portion 11A of the separator 11.

[0047] FIG. 7 is a perspective view showing the back surface of the plate member 310. As shown in FIG. 7, the plate member 310 has a bottom surface 319A. The bottom surface 319A faces the upper surface of the battery cell 100. A protruding rib 319 that protrudes from the bottom surface 319A of the plate member 310 toward the upper surface 121 of the battery cell 100 is provided on a part of the bottom surface 319A of the plate member 310. The protruding rib 319 abuts against the upper surface 121 of the battery cell 100. In the example of FIG. 7, the protruding rib 319 is intermittently formed so as to extend in the Y-axis direction on both sides of the through hole 313.

[0048] FIG. 8 is a view showing the positioning mechanism of the bus bar module 30 in the X-axis direction. As shown in FIG. 8, the bus bar module 30 is inserted between two adjacent stacked bodies (stacked bodies 10A and 10B in the example of FIG. 8), and has a positioning mechanism 330 for positioning the bus bar module 30 in the X-axis direction. In the example of FIG. 8, the stacked body 10A has a positioning mechanism 330A, and the stacked body 10B has a positioning mechanism 330B. However, the scope of the present technology is not limited to those in which all the stacked bodies 10 have the positioning mechanism 330, and only some of the plurality of stacked bodies 10 may have the positioning mechanism 330.

[0049] The positioning mechanism 330A has an insertion portion 331A that is press-fitted between the stacked bodies 10A and 10B. When the insertion portion 331A is press-fitted between the stacked bodies 10A and 10B, the bus bar module 30A is biased in a direction away from the stacked body 10B. At this time, the insertion portion 331A abuts against the side surface of the stacked body 10A, thereby positioning the bus bar module 30A in the X-axis direction.

[0050] The positioning mechanism 330B has an insertion portion 331B that is press-fitted between the stacked bodies 10A and 10B. When the insertion portion 331B is press-fitted between the stacked bodies 10A and 10B, the bus bar module 30B is biased in a direction away from the stacked body 10A. At this time, the insertion portion 331B abuts against the side surface of the stacked body 10B, thereby positioning the bus bar module 30B in the X-axis direction.

[0051] Figs. 9 to 17 are diagrams showing modified examples of the positioning mechanism in the X-axis direction. The positioning mechanism 330A shown in Fig. 9 is included in the bus bar module 30A provided on the laminate 10A, and includes an insertion portion 331A press-fitted between the laminates 10A and 10B, and a convex portion 332A protruding in the X-axis direction from the end face 312 of the plate member 310. The insertion portion 331A is provided so as to protrude in the Z-axis direction from the convex portion 332A. A protruding portion 333A protruding toward the upper surface 121 of the battery cell 100 is provided at the bottom of the convex portion 332B.

[0052] When the insertion portion 331A is press-fitted between the laminates 10A and 10B, the protruding portion 333A abuts on the upper surface 121 of the battery cell 100 of the laminate 10A and the upper surface 121 of the battery cell 100 of the laminate 10B. That is, the insertion portion 331A is press-fitted to a position where the protruding portion 333A abuts on the upper surface 121 of the battery cell 100. This press-fitting is performed by pressing the convex portion 332A toward the laminate 10 side (downward) with a human hand (finger).

[0053] The insertion portion 331A shown in Fig. 9 has a shape that is asymmetric when viewed from the Y-axis direction. The insertion portion 331A has a thick portion 3311A and a thin portion 3312A. In the positioning mechanism 330B included in the bus bar module 30B provided on the laminate 10B, the same structure as the positioning mechanism 330A may be adopted.

[0054] As in the examples shown in Figs. 10 to 13, the protruding portion 333 may not be provided in the positioning mechanism 330, or as in the examples shown in Figs. 14 to 17, the positioning mechanism 330 provided with the protruding portion 333 at the bottom of the convex portion 332 may be used. Considering more accurately managing the pushing amount of the insertion portion 331 between a plurality of laminates 10, it is preferable to provide the protruding portion 333 that abuts on the upper surface 121 of the battery cell 100 as shown in Figs. 14 to 17.

[0055] As in the examples of FIGS. 10 to 13, the upper side of the substantially U-shaped or substantially V-shaped insertion portion 331 may be separated, or as in the examples shown in FIGS. 14 to 17, the upper openings of the substantially U-shaped or substantially V-shaped insertion portion 331 may be connected. Considering the ease of pushing when pushing the insertion portion 331 between a plurality of stacked bodies 10, as shown in FIGS. 14 to 17, it is preferable that the upper openings of the substantially U-shaped or substantially V-shaped are connected.

[0056] The positioning mechanism 330 shown in the examples of FIGS. 16 and 17 further includes a protruding portion 334 that protrudes from the convex portion 332 to the opposite side of the protruding portion 333 (the side away from the upper surface 121 of the battery cell 100). In this case, when pushing the insertion portion 331 between a plurality of stacked bodies 10, the protruding portion 334 can be pressed.

[0057] As described above, since the battery pack 1 according to the present embodiment adopts a Cell-to-Pack structure in which the stacked body 10 including a plurality of battery cells 100 is directly housed in the case 20, members such as a bind bar in the module structure cannot be used as members for positioning the bus bar module 30.

[0058] In the battery pack 1 according to the present embodiment, since it includes an insertion portion 331 that is inserted (press-fitted) along the Z-axis direction between a plurality of stacked bodies 10 and a positioning mechanism 330 that positions the bus bar module 30 in the X-axis direction is provided, it is possible to position the plate member 310 in the X-axis direction. Therefore, in the battery pack 1 having a Cell-to-Pack structure, the bus bar module 30 can be accurately positioned without providing a complicated mechanism.

[0059] In the present technology, all of the plurality of stacked bodies 10 may be provided with the positioning mechanism 330, or a part of the plurality of stacked bodies 10 may be provided with the positioning mechanism 330.

[0060] The insertion portion 331 may have a shape that is asymmetric left and right when viewed from the Y-axis direction, or may have a symmetric shape.

[0061] As illustrated in FIGS. 14 to 17, by bringing the protrusion 333 provided at the bottom of the convex portion 332 of the positioning mechanism 330 into contact with the upper surface 121 of the battery cell 100, the pushing amount of the insertion portion 331 can be accurately controlled. As a result, the positioning of the bus bar module 30 in the X-axis direction can be performed more accurately. However, in the present technology, the protrusion 333 is not necessarily an essential configuration.

[0062] In the battery pack 1, the positioning mechanism 317 provided on the plate member 310 biases the side wall 21 of the case 20, so that the bus bar module 30 can be positioned not only in the X-axis direction but also in the Y-axis direction.

[0063] In the battery pack 1, the protruding rib 319 protruding from the bottom surface 319A of the plate member 310 toward the battery cell 100 is in contact with the upper surface 121 of the battery cell 100. In this way, by bringing the protruding rib 319 into contact with the battery cell 100, the contact area between the plate member 310 and the upper surface 121 of the battery cell 100 is reduced, the frictional resistance when the plate member 310 moves with respect to the battery cell 100 is reduced, and the positioning of the plate member 310 can be performed smoothly and accurately.

[0064] Note that the shape or arrangement of the protruding rib 319 is not limited to that shown in FIG. 7. Also, in the present technology, the protruding rib 319 is not necessarily an essential configuration.

[0065] In the battery pack 1, since the plate member 310 has the concave portion 318 that avoids the protruding portion 11A of the separator 11, when the positioning mechanism 317 positions the plate member 310 in the Y-axis direction, the movement of the plate member 310 in the Y-axis direction is not hindered by the protruding portion 11A of the separator 11. Therefore, the positioning of the plate member 310 can be performed smoothly and accurately.

[0066] However, in the present technology, the protruding portion 11A of the separator 11 and the recess 318 of the plate member 310 are not necessarily essential components.

[0067] As described above, the embodiments of the present technology have been explained. However, it should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present technology is indicated by the scope of the claims, and it is intended that all modifications within the meaning and scope equivalent to the scope of the claims are included.

Explanation of Reference Numerals

[0068] 1 Battery pack, 10, 10A, 10B, 10C Laminated body, 11 Separator, 11A Protruding portion, 20 Case, 21 Side wall, 30, 30A, 30B, 30C Bus bar module, 100 Battery cell, 110 Electrode terminal, 110A Protruding portion, 111 Positive electrode terminal, 112 Negative electrode terminal, 120 Housing, 121 Upper surface, 122 Lower surface, 123 First side surface, 124 Second side surface, 125 Third side surface, 130 Gas discharge valve, 310 Plate member, 311, 312 End face, 313 Through hole, 314 Wall portion, 314A First portion, 314B Second portion, 314C Third portion, 315 Rib, 316 Lock, 317 Positioning mechanism, 318 Recess, 319 Protruding rib, 319A Bottom surface, 320 Bus bar, 321 Root portion, 322, 323 Connection portion, 330, 330A, 330B Positioning mechanism, 331, 331A, 331B Insertion portion, 332 Convex portion, 333, 333A, 334 Protruding portion, 410 Wiring, 420 Screw, 3311, 3311A Thick portion, 3312, 3312A Thin portion.

Claims

1. A first laminate including a plurality of first battery cells arranged in a first direction, a second laminate adjacent to the first laminate in a second direction orthogonal to the first direction and including a plurality of second battery cells arranged in the first direction, a case having side walls facing the first laminate and the second laminate from the first direction and housing the first laminate and the second laminate, a first bus bar module disposed on the first laminate and including a first bus bar electrically connecting the plurality of first battery cells and a first plate member housing the first bus bar, a second bus bar module disposed on the second laminate and including a second bus bar electrically connecting the plurality of second battery cells and a second plate member housing the second bus bar, A battery pack, wherein at least one of the first bus bar module and the second bus bar module has a portion inserted between the first laminate and the second laminate, and has a first positioning mechanism for positioning the first bus bar module or the second bus bar module in the second direction.

2. The battery pack according to claim 1, wherein the inserted portion of the first positioning mechanism is press-fitted between the first laminate and the second laminate.

3. The battery pack according to claim 1 or 2, wherein the inserted portion of the first positioning mechanism has a shape that is asymmetric left and right when viewed from the first direction.

4. The battery pack according to claim 3, wherein the inserted portion of the first positioning mechanism has a thick portion and a thin portion.

5. The first plate member includes a first convex portion protruding toward the second laminate along the second direction from an end surface of the first plate member, The battery pack according to claim 1 or 2, wherein a bottom portion of the first convex portion abuts at least one of the plurality of first battery cells and at least one of the plurality of second battery cells.

6. The second plate member includes a second convex portion protruding toward the first laminate along the second direction from an end surface of the second plate member, The battery pack according to claim 5, wherein a bottom portion of the second convex portion abuts at least one of the plurality of first battery cells and at least one of the plurality of second battery cells.

7. The plurality of first battery cells each have an upper surface facing the first plate member, The first plate member has a bottom surface facing the upper surfaces of the plurality of first battery cells, A protruding rib protruding from the bottom surface of the first plate member toward the upper surfaces of the plurality of first battery cells is provided on a part of the bottom surface of the first plate member, and the protruding rib abuts against the upper surfaces of the plurality of first battery cells. The battery pack according to claim 1 or claim 2.

8. The first plate member and the second plate member each have a second positioning mechanism that positions the first bus bar module and the second bus bar module in the first direction by biasing the side wall of the case. The battery pack according to claim 1 or claim 2.

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