Battery pack

Abstract

To provide a battery pack in which wiring is easily arranged even in a structure in which a space in a case is easily restricted.SOLUTION: A wire harness includes a connector portion provided on the other end side of a portion connected to a first laminate. A plurality of wirings of the wire harness include: a first portion provided with a cylindrical portion; a second portion located on a connector portion side with respect to the first portion and provided with no cylindrical portion; and a third portion located on the connector portion side with respect to the second portion and provided with the cylindrical portion. When viewed from a third direction orthogonal to a first direction and a second direction, at least the third portion of the plurality of wirings overlaps with a second laminate.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present technology relates to battery packs. [Background technology]

[0002] Wire harnesses in which a plurality of wires are bundled together have been known for some time. Prior art examples include JP-A-60-096122 (Patent Document 1), JP-A-2011-060466 (Patent Document 2), and JP-A-2015-109722 (Patent Document 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 60-096122 [Patent Document 2] JP 2011-060466 A [Patent Document 3] JP 2015-109722 A Summary of the Invention [Problem to be solved by the invention]

[0004] In battery packs, a cell-to-pack structure is beginning to be adopted in which a stack containing multiple battery cells is stored directly in a case without using end plates and bind bars (module structure) that restrain multiple battery cells.

[0005] In a cell-to-pack structure, multiple battery cells are close to the side wall of the case that faces them, which can easily create space restrictions inside the case and make it difficult to route the wiring connected to the battery cells.

[0006] An object of the present technology is to provide a battery pack in which wiring can be easily arranged even in a structure in which space inside the case is likely to be restricted. [Means for solving the problem]

[0007] The present technology provides the following battery pack.

[0008] [1] A battery pack comprising: a first stack including a plurality of first battery cells aligned in a first direction; a second stack including a plurality of second battery cells adjacent to the first stack in a second direction perpendicular to the first direction and aligned in the first direction; a case having a sidewall facing the first stack and the second stack in the first direction and housing the first stack and the second stack; a wire harness including a plurality of wires each connected to the first stack; and an insulating tubular portion provided on the outer periphery of the plurality of wires of the wire harness, wherein the wire harness includes a connector portion provided on the other end side of the portion connected to the first stack, the plurality of wires of the wire harness including a first portion having the tubular portion, a second portion located on the connector portion side with respect to the first portion and not having the tubular portion, and a third portion located on the connector portion side with respect to the second portion and having the tubular portion, wherein at least the third portion of the plurality of wires overlaps the second stack when viewed from a third direction perpendicular to the first direction and the second direction.

[0009] [2] The battery pack according to [1], wherein the cylindrical portion includes an insulating tape wrapped around the multiple wirings.

[0010] [3] The battery pack described in [1] or [2], further comprising a busbar module disposed on the first stack, the busbar module including a busbar electrically connecting a plurality of first battery cells, a plate member housing the busbar, and a cover member provided on the plate member, wherein the plurality of wirings are fixed to the cover member.

[0011] [4] The battery pack according to any one of [1] to [3], wherein the wire harness has a length that enables the connector portion to reach the outside of the case.

[0012] [5] The battery pack described in any one of [1] to [4], comprising: a busbar module including a busbar electrically connecting a plurality of first battery cells and a plate member for housing the busbar, and arranged on the first stack; and a board unit including a board at least a portion of which is arranged on the busbar module and electrically connected to the first stack, wherein the connector portion is connected to the board unit. Effect of the Invention

[0013] According to this technology, by alternately providing portions (first and third portions) on the outer periphery of a plurality of wires where a cylindrical portion is provided and portions (second portions) where no cylindrical portion is provided, the plurality of wires can be bundled by the cylindrical portion while bending the portion without the cylindrical portion to allow smooth routing of the wire harness. As a result, it is possible to provide a battery pack that allows easy routing of the wires in the narrow space inside the case in a cell-to-pack structure where the plurality of battery cells are close to the side wall of the case facing them. [Brief description of the drawings]

[0014] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. 4 is a top view of a plate member in the bus bar module. [Figure 4] FIG. 2 is a perspective view showing a structure around a bus bar. [Diagram 5] 13A and 13B are diagrams illustrating a positioning mechanism for the bus bar module in the Y-axis direction. [Figure 6] FIG. 2 is a perspective view showing the structure between the bus bar module and the upper surface of the battery cell. [Figure 7] FIG. 4 is a perspective view showing a rear surface of a plate member in the bus bar module. [Figure 8] 13A and 13B are diagrams illustrating a positioning mechanism for the bus bar module in the X-axis direction. [Figure 9]1 is a diagram showing the periphery of a junction box housed in a case as viewed from the Z-axis direction. [Figure 10] 4A and 4B are diagrams showing the arrangement of a board unit and a wire harness; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, embodiments of the present technology will be described. Note that the same or corresponding parts are denoted by the same reference characters, and description thereof will not be repeated.

[0016] In the embodiments described below, when referring to the number, amount, etc., the scope of the present technology is not necessarily limited to the number, amount, etc., unless otherwise specified. In addition, in the following embodiments, each component is not necessarily essential to the present technology, unless otherwise specified. In addition, the present technology is not necessarily limited to those that achieve all of the effects and advantages mentioned in the present embodiment.

[0017] In this specification, the words "comprise", "include" and "have" are open-ended, i.e., when a certain configuration is included, other configurations may or may not be included.

[0018] Furthermore, when geometric terms and terms expressing positional and directional relationships, such as "parallel," "orthogonal," "45° diagonal," "coaxial," and "along" are used in this specification, these terms allow for manufacturing errors and slight variations. When terms expressing relative positional relationships, such as "upper side" and "lower side," are used in this specification, these terms are used to indicate relative positional relationships in one state, and the relative positional relationships can be inverted or rotated to any angle depending on the installation direction of each mechanism (for example, by turning the entire mechanism upside down).

[0019] In this specification, the term "battery" is not limited to lithium ion batteries, but may include other batteries such as nickel-metal hydride batteries and sodium ion batteries. In this specification, the term "battery pack" can be mounted in hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), and the like. However, the use of the "battery cell" is not limited to in-vehicle use.

[0020] Fig. 1 is an exploded perspective view of a battery pack 1. As shown in Fig. 1, the battery pack 1 includes a stack 10 including a plurality of battery cells 100 (see Fig. 2) arranged in a Y-axis direction (first direction), a case 20 that houses the stack 10, and a bus bar module 30 arranged on the stack 10.

[0021] 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.

[0022] The case 20 has a pair of side walls 21 that face the stacks 10A, 10B, 10C in the Y-axis direction. The side walls 21 directly support the stacks 10A, 10B, 10C from both sides in the Y-axis direction. In this manner, the battery pack 1 according to this embodiment employs a cell-to-pack structure in which the stack 10 including the multiple battery cells 100 is stored directly in the case.

[0023] The case 20 has a pair of side walls 22 extending in a direction perpendicular to the side walls 21, and a bottom surface 23 facing the stacked bodies 10A, 10B, and 10C in the Z-axis direction. The portion of the bottom surface 23 on which the stacked bodies 10A, 10B, and 10C are placed is formed to extend in the XY plane. The bottom surface 23 includes an inclined surface 23A formed at a position adjacent to the stacked bodies 10A, 10B, and 10C or at a position spaced apart from the stacked bodies 10A, 10B, and 10C. The inclined surface 23A extends in a direction obliquely intersecting the XY plane.

[0024] The busbar module 30 includes a busbar module 30A (first busbar module) arranged on the laminate 10A, a busbar module 30B (second busbar module) arranged on the laminate 10B, and a busbar module 30C (third busbar module) arranged on the laminate 10C.

[0025] Fig. 2 is a perspective view showing the configuration of the battery cell 100 constituting 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 release valve 130.

[0026] The electrode terminals 110 are formed on the housing 120. The electrode terminals 110 include a positive terminal 111 and a negative terminal 112 as two electrode terminals 110 arranged along an X-axis direction (second direction) perpendicular to a Y-axis direction (first direction). The positive terminal 111 and the negative terminal 112 are provided apart from each other in the X-axis direction.

[0027] The housing 120 has a substantially rectangular parallelepiped shape. An electrode body and an electrolyte (not shown) are accommodated 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.

[0028] The upper surface 121 is a plane perpendicular to the Z-axis direction. The electrode terminals 110 are disposed on the upper surface 121. The lower surface 122 faces the upper surface 121 along the Z-axis direction (third direction) perpendicular to the Y-axis direction (first direction) and the X-axis direction (second direction).

[0029] Each of the first side surface 123 and the second side surface 124 is formed of a plane perpendicular to the Y-axis direction. Each of the first side surface 123 and the second side surface 124 has the largest area among the multiple 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 with the X-axis direction being the long side direction and the Z-axis direction being the short side direction when viewed in the Y-axis direction.

[0030] The multiple battery cells 100 are stacked such that the first side surfaces 123 and the second side surfaces 124 of the battery cells 100 adjacent to each other in the Y-axis direction face each other. As a result, the positive electrode terminals 111 and the negative electrode terminals 112 are arranged alternately in the Y-axis direction in which the multiple battery cells 100 are stacked.

[0031] Gas exhaust valve 130 is provided on upper surface 121. When the internal pressure of housing 120 increases to a predetermined value or higher due to gas generated inside housing 120, gas exhaust valve 130 opens and exhausts the gas to the outside of housing 120.

[0032] Next, the basic configuration of the busbar module 30 will be described with reference to Fig. 3 and Fig. 4. Fig. 3 is a top view of a plate member 310 included in the busbar module 30. Fig. 4 is a perspective view showing the structure around a busbar 320 in the busbar module 30.

[0033] Each of the busbar modules 30A, 30B, and 30C includes a plate member 310 shown in Fig. 3. As shown in Fig. 3, the plate member 310 includes an end face 311 located at the end in the Y-axis direction, an end face 312 located at the end in the X-axis direction, a through-hole 313 formed in a position corresponding to the gas release valve 130 of the battery cell 100, and a wall portion 314 that divides the space on the plate member 310 into multiple sections.

[0034] As shown in Fig. 4, a bus bar 320 is stored 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 the multiple battery cells 100 to each other. The bus bar 320 includes a root 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 root portion 321 in the X-axis direction. The connection portions 322 and 323 are each connected to the electrode terminals 110 of two battery cells 100 adjacent to each other in the Y-axis direction.

[0035] 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 spaced apart from each other in the Y-axis direction. The third portion 314C connects the first portion 314A and the second portion 314B.

[0036] Ribs 315 and locks 316 are formed on wall portion 314. Ribs 315 protrude on both sides in the Y-axis direction from positions adjacent to third portion 314C of wall portion 314. Ribs 315 position adjacent bus bars 320 in the Y-axis direction. Locks 316 lock bus bars 320 in the Z-axis direction. The shapes and arrangements of ribs 315 and locks 316 are not limited to those shown in FIG. 4 and can be changed as appropriate.

[0037] Bus bar 320 is connected to wiring 1100. Wiring 1100 is fixed to bus bar 320 by screws 1200. The configuration of wiring 1100 and screws 1200 is not limited to that shown in Fig. 4, and the wiring may be formed by, for example, a flexible wiring board.

[0038] The electrode terminals 110 and the busbars 320 of the battery cells 100 are welded together after being positioned relative to each other in the X-axis and Y-axis directions. By performing this positioning accurately, the welding process between the electrode terminals 110 and the busbars 320 can be performed with high efficiency and quality. When the busbars 320 are stored in the space partitioned by the wall portions 314, they are accurately positioned relative to the plate member 310 in the X-axis and Y-axis directions. Therefore, it is necessary to accurately position the plate member 310 and the stack 10.

[0039] A positioning mechanism for the bus bar module 30 (plate member 310) in this embodiment will be described with reference to FIGS.

[0040] Fig. 5 is a diagram showing a positioning mechanism for the busbar module 30 in the Y-axis direction. As shown in Fig. 5, the plate member 310 of the busbar module 30 has a protrusion 317 (positioning mechanism) that biases the side wall 21 of the case 20 to position the busbar module 30 in the Y-axis direction.

[0041] 5 is configured by a snap-fit ​​shaped protrusion formed on end surface 311 of plate member 310. Protrusion 317 protrudes from end surface 311 of plate member 310 toward side wall 21. When plate member 310 is installed in case 20, protrusion 317 presses side wall 21 of case 20, urging plate member 310 toward a predetermined position. As a result, busbar module 30 is positioned in the Y-axis direction.

[0042] The protrusions 317 may be provided on end faces 311 of the plate member 310 on both sides in the Y axis direction, or on only one side in the Y axis direction of the plate member 310. When the protrusions 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 protrusions 317 on both sides are balanced. When the protrusion 317 is provided on one side in the Y axis direction, the plate member 310 is biased toward the side wall 21 opposite to the side on which the protrusion 317 is provided, and is positioned using the side wall 21 as a reference plane.

[0043] The protrusions 317 deform toward the center of the stack 10 as a reaction to the pressure on the side walls 21 of the case 20. At this time, it is preferable that the protrusions 317 are located in a position that does not interfere with the gas release valves 130 when viewed from the Z axis direction. In this way, the busbar module 30 can be positioned in the Y axis direction without affecting the release of gas from the gas release valves 130 of the battery cells 100 located at the ends in the Y axis direction.

[0044] 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.

[0045] As shown in FIG. 6, the laminate 10 includes a separator 11 provided between the multiple battery cells 100. The separator 11 may be a film or 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 around the housing 120. The separator 11 may be a plate-like member (plate) that is sandwiched between the adjacent battery cells 100. The separator 11 may also be formed by combining the above film or tape with a plate-like member. The separator 11 has a protruding portion 11A that protrudes toward the plate member 310 side beyond the multiple battery cells 100. The plate member 310 has a recessed portion 318 that avoids the protruding portion 11A of the separator 11.

[0046] 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 formed discontinuously on both sides of the through hole 313 so as to extend in the Y-axis direction.

[0047] Fig. 8 is a diagram showing a positioning mechanism for the busbar module 30 in the X-axis direction. As shown in Fig. 8, the busbar module 30 has an insertion mechanism 330 that is inserted between two adjacent laminates (laminates 10A and 10B in the example of Fig. 8) and positions the busbar module 30 in the X-axis direction. In the example of Fig. 8, the laminate 10A has the insertion mechanism 330A, and the laminate 10B has the insertion mechanism 330B, but the scope of the present technology is not limited to a case where all laminates 10 have the insertion mechanism 330, and only a part of the multiple laminates 10 may have the insertion mechanism 330.

[0048] The insertion mechanism 330A has an insertion portion 331A that is press-fitted between the laminates 10A and 10B. When the insertion portion 331A is press-fitted between the laminates 10A and 10B, the busbar module 30A is biased in a direction away from the laminate 10B. At this time, the insertion portion 331A comes into contact with a side surface of the laminate 10A, thereby positioning the busbar module 30A in the X-axis direction.

[0049] The insertion mechanism 330B has an insertion portion 331B that is press-fitted between the laminates 10A, 10B. When the insertion portion 331B is press-fitted between the laminates 10A, 10B, the busbar module 30B is biased in a direction away from the laminate 10A. At this time, the insertion portion 331B comes into contact with a side surface of the laminate 10B, thereby positioning the busbar module 30B in the X-axis direction.

[0050] FIG. 9 is a diagram showing the periphery of a junction box 40 (electrical device) housed in the case 20 as viewed from the Z-axis direction.

[0051] 9, an external terminal 50 is provided on the side wall 22 of the case 20. The junction box 40 is disposed on an inclined surface 23A located between the stacks 10A, 10B, 10C and the external terminal 50 along the X-axis direction.

[0052] The junction box 40 includes a relay 410 , a resistor 420 , a fuse mechanism 430 , a terminal connection portion 440 , a housing 460 , and a bus bar 480 .

[0053] The relay 410 and the resistor 420 are housed in a housing 460. The fuse mechanism 430 and the terminal connection portion 440 are attached to the inside of the side wall 22 of the case 20. The relay 410 is heavy compared to other electrical components such as the resistor 420 housed in the housing 460. In other words, the relay 410 is the heaviest of the electrical components housed in the housing 460.

[0054] Housing 460 is fastened to inclined surface 23A of case 20 at fastening portion 450. In the example of Fig. 9, five fastening portions 451, 452, 453, 454, and 455 are provided. In the example of Fig. 9, three fastening portions 451, 452, and 453 are provided so that their centers surround center of gravity 411A of negative relay 411 (dashed line in Fig. 9). Moreover, four fastening portions 452, 453, 454, and 455 are provided so that their centers surround center of gravity 412A of positive relay 412 (dashed line in Fig. 9).

[0055] 9, at least three fastening parts 450 (for example, three or four fastening parts 450) are arranged so as to surround the centers of gravity 411A, 412A of the two relays 411, 412. By arranging the fastening parts 450 so as to surround the relay 410, which is a heavy object, the housing 460 can be stably fixed to the case 20.

[0056] The multiple battery cells 100 constituting the stacks 10A, 10B, 10C are connected in series, and their negative electrode terminals are connected to a bus bar 481 of the junction box 40 at a fastening portion 480A. The bus bar 481 is connected to a relay 411.

[0057] Relay 411 is connected to fuse mechanism 430 via bus bar 482. Fuse mechanism 430 has first portion 431 and second portion 432, and a melting portion is provided between first portion 431 and second portion 432. First portion 431 and second portion 432 of fuse mechanism 430 are connected to bus bars 482, 483, respectively, via fastening portion 430A. As a result, bus bar 482 and bus bar 483 are connected to each other via fuse mechanism 430. The other end of bus bar 483 is connected to terminal connection portion 441 via fastening portion 440A.

[0058] The positive electrode side general terminals of the multiple battery cells 100 constituting the stacks 10A, 10B, 10C are connected to a bus bar 484 of the junction box 40 at fastening portion 480B. The bus bar 484 is connected to a resistor 420. The resistor 420 is connected to a relay 412 via a bus bar 485. The relay 412 is connected to a terminal connection portion 442 via a bus bar 486.

[0059] The fastening portions 430A, 440A are formed of fastening members such as bolts. The terminal connection portions 441, 442 are electrically connected to the external terminal 50. As a result, the external terminal 50 forms a power supply port for the battery cell 100 and the junction box 40 housed in the case 20.

[0060] Fig. 10 is a diagram showing the arrangement of the board unit 60 and the wire harnesses 70A, 70B, and 70C. Fig. 10 shows the case 20 as viewed from the Z-axis direction.

[0061] As shown in FIG. 10, the board unit 60 includes a board 61 electrically connected to the multiple battery cells 100 and the junction box 40. The board unit 60 is arranged so that a part of it is located on the bus bar module 30C. In the example of FIG. 10, the board unit 60 is arranged so that it extends from above the bus bar module 30C to above the junction box 40. The board unit 60 may be arranged so that the entire board unit 60 is located on the bus bar module 30. The board unit 60 is fastened to the junction box 40 at the fastening portion 60A. After the board unit 60 is fastened to the junction box 40, the junction box 40 is fixed to the bottom surface 23 of the case 20 at the fastening portion 450.

[0062] The wire harnesses 70A, 70B, and 70C are formed by bundling a plurality of wires 1100 shown in Fig. 3. The wire harness 70A includes a plurality of wires 1100 each connected to a plurality of battery cells 100 that constitute the laminate 10A. The wire harness 70B includes a plurality of wires 1100 each connected to a plurality of battery cells 100 that constitute the laminate 10B. The wire harness 70C includes a plurality of wires 1100 each connected to a plurality of battery cells 100 that constitute the laminate 10C.

[0063] Connector portions 80A, 80B, 80C connected to the board unit 60 are provided at the tip sides of the wire harnesses 70A, 70B, 70C, respectively. At the base sides of the wire harnesses 70A, 70B, 70C, the multiple wirings 1100 are fixed to the cover member 340 of the bus bar module 30. For example, the base side of the wire harness 70A is fixed to the cover member 340A of the bus bar module 30A, and the base side of the wire harness 70B is fixed to the cover member 340B of the bus bar module 30B.

[0064] At least a part of the wiring 1100 constituting the wire harnesses 70A, 70B, and 70C is provided with an insulating tubular portion. The tubular portion may be formed by wrapping an insulating tape around the outer periphery of a wiring group in which the plurality of wirings 1100 are bundled, or by disposing a corrugated tube around the outer periphery of a wiring group in which the plurality of wirings 1100 are bundled. By providing a tubular portion around the outer periphery of the plurality of wirings 1100, the plurality of wirings 1100 can be bundled. In addition, the wirings 1100 can be protected.

[0065] On the other hand, not providing a cylindrical portion on the outer periphery of the wiring 1100 makes the wiring 1100 easier to bend and can reduce the minimum bending radius of the wiring 1100. From the viewpoint of handling the wire harnesses 70A, 70B, and 70C in the manufacturing process of the battery pack 1, there are cases where it is desired to locally make the minimum bending radius of the wiring 1100 smaller.

[0066] For example, if the wire harnesses 70A, 70B, 70C are arranged in a disorderly manner before the connector parts 80A, 80B, 80C are connected to the board unit 60, workability may be reduced in processes such as installing the junction box 40 and the board unit 60.

[0067] Furthermore, if the wire harnesses 70A, 70B, 70C have a length that allows the connector portions 80A, 80B, 80C to reach the outside of the case 20, the connector portions 80A, 80B, 80C may protrude outside the case 20 and interfere with or be pinched by jigs and other manufacturing equipment.

[0068] In contrast, in the battery pack 1 according to the present embodiment, by intentionally arranging parts on the outer periphery of the wiring group that have an insulating tubular portion and parts that do not have a tubular portion, a part is provided that can reduce the minimum bending radius of the wiring group, and by bending this part, the wire harnesses 70A, 70B, and 70C can be smoothly handled in the manufacturing process.

[0069] For example, the multiple wirings 1100 of the wire harness 70A connected to the laminate 10A include a first portion 71A having a cylindrical portion on its outer periphery, a second portion 72A located on the connector portion 80A side relative to the first portion 71A and not having a cylindrical portion, and a third portion 73A located on the connector portion 80A side relative to the second portion 72A and having a cylindrical portion.

[0070] In addition, the multiple wirings 1100 of the wire harness 70B connected to the laminate 10B include a first portion 71B having a cylindrical portion on its outer periphery, a second portion 72B located on the connector portion 80B side of the first portion 71B and not provided with a cylindrical portion, and a third portion 73B located on the connector portion 80B side of the second portion 72B and provided with a cylindrical portion.

[0071] When the connector portion 80A of the wire harness 70A is connected to the board unit 60, when viewed from the Z-axis direction as shown in Figure 10, the multiple wirings 1100 of the wire harness 70A overlap with the adjacent laminate 10B at least in the third portion 73A.

[0072] The wiring 1100 of the wire harness 70A connected to the laminate 10A separated from the board unit 60 is particularly likely to be long. According to the structure shown in Fig. 10, the first portion 71A and the third portion 73A having a cylindrical portion on the outer periphery of the wiring 1100 are alternately provided with the second portion 72A having no cylindrical portion, so that the second portion 72A can be bent with a smaller radius, and therefore the wire harness 70A can be easily handled both in the manufacturing process of the battery pack 1 (a stage before the connector portion 80A is connected to the board unit 60) and in the completed battery pack 1 (in a state where the connector portion 80A is connected to the board unit 60).

[0073] By skillfully routing the wire harness 70A, it is possible to improve the workability of bus bar welding while adequately protecting the wiring 1100 in the manufacturing process of the battery pack 1. It is also possible to reduce the size of the completed battery pack 1. The same is true for the wire harnesses 70B and 70C.

[0074] The above-mentioned effect is particularly effective in a cell-to-pack structure in which the multiple battery cells 100 and the side wall 21 of the case 20 facing them are close to each other, and space constraints within the case 20 tend to be significant.

[0075] Although the embodiment of the present technology has been described above, the embodiment disclosed herein should be considered as illustrative and not restrictive in all respects. The scope of the present technology is defined by the claims, and it is intended to include all modifications within the scope and meaning equivalent to the claims. [Explanation of symbols]

[0076] 1 battery pack, 10, 10A, 10B, 10C laminate, 11 separator, 11A protruding portion, 20 case, 21, 22 side wall, 23 bottom surface, 23A inclined surface, 23B horizontal portion, 30, 30A, 30B, 30C bus bar module, 40 junction box, 50 external terminal, 60 board unit, 60A fastening portion, 70A, 70B, 70C wire harness, 71A, 71B first portion, 72A, 72B second portion, 73A, 73B third portion, 80A, 80B, 80C connector portion, 100 battery cell, 110 electrode terminal, 111 positive terminal, 112 negative terminal, 120 housing, 121 upper surface, 122 lower surface, 123 first side surface, 124 second side, 125 third side, 130 gas exhaust 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 projection, 318 recess, 319 protruding rib, 319A bottom surface, 320 bus bar, 321 root portion, 322, 323 connection portion, 330, 330A, 330B insertion mechanism, 331A, 331B insertion portion, 410, 411, 412 relay, 411A, 412A center of gravity, 420 resistor, 430 fuse mechanism, 430A fastening portion, 431 first portion, 432 second portion, 440, 441, 442 Terminal connections, 440A Fastening parts, 450, 451, 452, 453, 454, 455 Fastening parts, 460 Housing, 480, 481, 482, 483, 484, 485, 486 Bus bars, 480A, 480B Fastening parts, 1100 Wiring, 1200 Screws.

Claims

1. A first stack including a plurality of first battery cells aligned in a first direction; a second stack adjacent to the first stack in a second direction perpendicular to the first direction and including a plurality of second battery cells aligned in the first direction; a case having side walls facing the first stack and the second stack in the first direction, the case housing the first stack and the second stack; a wire harness including a plurality of wirings each connected to the first laminate; an insulating tubular portion provided around the plurality of wires of the wire harness, the wire harness includes a connector portion provided on the other end side of the portion connected to the first laminate, the plurality of wirings of the wire harness include a first portion having the tubular portion, a second portion located on the connector portion side with respect to the first portion and not having the tubular portion, and a third portion located on the connector portion side with respect to the second portion and having the tubular portion, When viewed from a third direction perpendicular to the first direction and the second direction, at least the third portions of the plurality of wirings overlap the second stack.

2. The battery pack according to claim 1 , wherein the cylindrical portion includes an insulating tape wrapped around the plurality of wires.

3. a bus bar module including a bus bar electrically connecting the plurality of first battery cells, a plate member housing the bus bar, and a cover member provided on the plate member, the bus bar module being disposed on the first stack; The battery pack according to claim 1 , wherein the plurality of wires are fixed to the cover member.

4. 3. The battery pack according to claim 1, wherein the wire harness has a length that enables the connector portion to reach an outside of the case.

5. a bus bar module including a bus bar electrically connecting the plurality of first battery cells and a plate member housing the bus bar, the bus bar module being disposed on the first stack; a substrate unit including a substrate electrically connected to the first stack, The battery pack according to claim 1 , wherein the connector portion is connected to the board unit.

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