CN111834566A

CN111834566A - Accumulator package

Info

Publication number: CN111834566A
Application number: CN202010288016.2A
Authority: CN
Inventors: 东洋平; 北野亮; 铃木雅敏
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2019-04-22
Filing date: 2020-04-13
Publication date: 2020-10-27
Anticipated expiration: 2040-04-13
Also published as: CN111834566B; JP2020177857A; JP6888045B2

Abstract

Provided is a battery pack which can reliably prevent erroneous assembly of a battery module and a connecting member with a small and simple structure. The battery package comprises: a housing having a housing-side interference portion protruding inward; a cover covering the opening of the housing; a plurality of battery modules accommodated in the case in a first arrangement state and having a module-side interference portion protruding toward an outside where the case is located; and a connecting member electrically connected to a predetermined terminal of the battery module and having a third interference portion, wherein the housing-side interference portion interferes with the module-side interference portion when the battery module is to be housed in the housing in a second arrangement state different from the first arrangement state, and the housing-side interference portion interferes with the third interference portion when the connecting member is to be connected to another terminal different from the predetermined terminal.

Description

Accumulator package

Technical Field

The present invention relates to a battery package.

Background

Conventionally, in a power storage device mounted on a vehicle such as a hybrid vehicle, a structure of a battery pack including a plurality of battery modules accommodated in a case is known. Various techniques have been proposed for preventing a connecting member (hereinafter, referred to as "erroneous assembly") for electrically connecting each battery module and the battery module to each other from being mounted in an erroneous state.

For example, patent document 1 (japanese patent application laid-open No. 2014-93276) discloses the following structure: the power storage device is formed by arranging a plurality of power storage modules (battery modules) in parallel, and connecting terminals of the adjacent battery modules to each other by bus bars (connecting members), and the connecting members have long power storage module bus bars provided on one end side of the battery modules, short power storage module bus bars provided on the other end side of the battery modules, and insulating covers covering the battery module terminals. According to the technique described in patent document 1, even if the long power storage module bus bar and the short power storage module bus bar having different lengths are mistakenly assembled, the long power storage module bus bar and the short power storage module bus bar cannot be assembled, and therefore, the long power storage module bus bar and the short power storage module bus bar cannot be assembled by mistake. Further, since the covers on the one end side and the other end side are formed in different shapes from each other, it is possible to more reliably prevent erroneous assembly of the long power storage module bus bar and the short power storage module bus bar.

Problems to be solved by the invention

As described above, in the technique described in patent document 1, since the connecting member cannot be structurally attached to the connecting member when the connecting member is to be attached to an incorrect position, it is possible to suppress erroneous attachment without relying on an operator, as compared with a conventional method in which an operator visually checks the presence of erroneous attachment.

However, in the technique described in patent document 1, a cover or the like for preventing erroneous assembly is provided, and thus a battery module group including a plurality of battery modules is likely to be large in size. Therefore, there is a problem in that the battery module is smaller than the conventional one. Further, there is room for improvement in terms of simplification of the structure and reduction in the number of components.

Disclosure of Invention

Accordingly, an object of the present invention is to provide a battery pack that can reliably prevent erroneous assembly of a battery module and a connecting member with a small and simple structure.

Means for solving the problems

A battery pack according to an aspect of the present invention (for example, a battery pack 1 according to an embodiment) includes: a housing (e.g., a housing 3 in the embodiment) having a first interference portion (e.g., a housing-side interference portion 31 in the embodiment) protruding inward; a cover (e.g., cover 5 in embodiments) that covers an opening (e.g., opening 30 in embodiments) of the housing; a plurality of battery modules (for example, battery modules 4 in the embodiment) that are housed in the case in a first arrangement state and that have second interference portions (for example, module-side interference portions 92 in the embodiment) that protrude outward from the case; and a connecting member (for example, a connecting member 8 in the embodiment) that is electrically connected to a predetermined terminal (for example, a terminal 95 in the embodiment) of the battery module, and that has a third interference portion (for example, a third interference portion 87 in the embodiment), the first interference portion and the second interference portion interfering with each other when the battery module is to be housed in the case in a second disposition state different from the first disposition state, and the first interference portion and the third interference portion interfering with each other when the connecting member is to be connected to another terminal different from the predetermined terminal.

In one example, the battery module includes a plate-shaped member (e.g., a bottom plate 78 in the embodiment) that is provided between a bottom wall (e.g., a bottom wall 37 in the embodiment) of the case and a battery module main body (e.g., a battery module main body 70 in the embodiment) and that is formed in a rectangular shape in a plan view when viewed from the opening side, and the plate-shaped member includes the second interference portion that is formed to protrude outward in a plane direction.

In one example, the battery module is formed by stacking a plurality of rectangular plate-shaped battery cells (for example, the battery cells 71 in the embodiment) in a first direction (for example, the first direction D1 in the embodiment) in which the battery cells are arranged to face each other, and the second interference portions are provided at both end portions of the plate-shaped member in the first direction, protrude in the first direction, and are arranged at positions offset from a middle portion of the plate-shaped member in a second direction (for example, the second direction D2 in the embodiment) in which the plurality of battery modules are arranged to be orthogonal to the first direction.

In one example, the first interference portion is provided on one side in the first direction with respect to the battery modules, the battery modules have the terminals at both ends in the first direction, and the predetermined terminals provided on the other side in the first direction of the two battery modules adjacent in the second direction are connected to each other by the connecting member.

In one example, the battery module includes a terminal plate (for example, a terminal plate 90 in an embodiment) to which the connection member can be attached from the opening side, the terminal plate being formed with the terminal to which the connection member is connected, the connection member including a main body portion (for example, a main body portion 86 in an embodiment) disposed closer to the opening side than the terminal plate, and the third interference portion protruding from the main body portion toward the case side, and the first interference portion being formed to protrude from an inner wall of the case.

In one example, the connecting member includes a bus bar (for example, a bus bar 88 in the embodiment) formed of a conductive material, and a bus bar cover (for example, a bus bar cover 89 in the embodiment) formed of an insulating material and covering at least a part of the bus bar, and the third interference portion is provided in the bus bar cover.

In one example, the housing is a metal die cast product, and the first interference portion is formed integrally with the housing.

In one example, the housing has a plurality of the first interference portions, a bolt hole (for example, bolt hole 15 in the embodiment) formed from an outer wall (for example, outer wall 39 in the embodiment) of the housing toward the inner side is provided in at least one of the plurality of the first interference portions, and an electric component (for example, electric component 61 in the embodiment) is mounted by a bolt (for example, bolt 16 in the embodiment) fixed to the bolt hole.

Effects of the invention

According to the battery pack of one aspect of the present invention, the case has the first interference portion, the battery module has the second interference portion, and the first interference portion and the second interference portion interfere with each other when the battery module is to be housed in the case in the second arrangement state different from the first arrangement state. According to this configuration, even if the battery module is erroneously assembled to the case in the second arrangement state, the battery module cannot be assembled, and therefore erroneous assembly of the battery module can be prevented. The connecting member has a third interference portion, and the first interference portion and the third interference portion interfere with each other when the connecting member is connected to another terminal different from the predetermined terminal. According to this configuration, even if the housing is erroneously assembled with the other terminal, the housing cannot be assembled, and therefore, erroneous assembly of the connecting member can be prevented.

Since the first interference portion, the second interference portion, and the third interference portion are provided in the case, the battery module, and the connecting member, respectively, to prevent the battery module and the connecting member from being erroneously assembled, the structure of the battery pack can be simplified and the number of components can be reduced, compared to the conventional art in which the cover member is separately provided to prevent the erroneous assembly. Thus, the battery pack can be made lightweight, the ratio of the battery pack in the case can be increased, and the space in the case can be effectively used.

Therefore, it is possible to provide a battery pack that can reliably prevent erroneous assembly of the battery module and the connecting member with a small and simple structure.

In one example, the battery module includes a plate-like member provided between the bottom wall of the case and the battery module main body, and therefore, for example, the battery module can be fixed to the bottom wall of the case via the plate-like member. In addition, since the second interference portion is formed along the surface direction of the plate-shaped member, the plate-shaped member can achieve both the fixing of the battery module and the second interference portion. Therefore, the number of components of the battery module can be reduced. In addition, since the battery module is provided between the bottom wall of the case and the battery module main body, the second interference portion can be disposed close to the bottom wall of the case. Therefore, a space can be secured on the opening side of the housing, and components such as a connecting member can be disposed in the space. Therefore, the space in the case can be effectively used, and the proportion of the battery pack in the case can be increased.

In one example, the second interference portions are provided at both end portions of the plate-like member in the first direction and are arranged at positions offset from the middle portion of the plate-like member in the second direction, and therefore, for example, when the battery pack is to be arranged in a state (second arrangement state) in which the battery pack is inverted by 180 ° in a plan view from the first arrangement state, the positions of the second interference portions with respect to the case change. According to this configuration, the battery pack can be reliably prevented from being arranged in the second arrangement state with respect to the case. Therefore, the battery pack can reliably prevent erroneous assembly of the battery module with a simple configuration.

In one example, the first interference portion is provided at one side of the battery module in the first direction, and the connecting member is disposed at the other side of the battery module in the first direction, and therefore, for example, when the connecting member is erroneously disposed at one side of the battery module in the first direction, the third interference portion of the connecting member interferes with the first interference portion. This makes it impossible to assemble the connecting member, and therefore, erroneous assembly of the connecting member can be reliably prevented.

In one example, the connecting member includes a main body portion and a third interference portion, and the main body portion is disposed on the opening side of the case with respect to the terminal plate, so that the space on the opening side of the terminal plate can be effectively used, and the battery pack can be prevented from being increased in size in the first direction and the second direction. Further, since the third interference portion protrudes from the body portion toward the housing side and the first interference portion protrudes from the inner wall of the housing, the third interference portion and the first interference portion can reliably interfere with each other when the connecting member is erroneously disposed. Therefore, the battery pack can reliably prevent erroneous assembly of the connecting member.

In one example, the third interference portion is provided in the bus bar cover, and therefore, for example, when the connecting member is erroneously disposed, direct interference between the first interference portion and the bus bar can be suppressed. This can suppress damage to the bus bar caused by interference between the bus bar and the first interference portion. Therefore, the performance of the bus bar is suppressed from being lowered, and the safety of the battery pack can be maintained high.

In particular, when the housing having the first interference portion is formed of a metal material, the third interference portion is provided in the bus bar cover formed of an insulating material, and thus insulation between the housing and the connecting member when the first interference portion and the third interference portion interfere with each other can be ensured. Therefore, a battery pack with improved safety can be obtained.

In one example, the housing is formed by metal die casting, and therefore the first interference portion can be formed integrally with the housing. Therefore, the battery pack can be easily manufactured and the number of components can be reduced. In particular, when the third interference portion is formed of an insulating material, it is possible to ensure insulation between the first interference portion and the third interference portion of the housing and to facilitate manufacturing.

In one example, since the bolt hole is formed in the outer wall of the housing, an electrical component such as a wire harness can be attached to the outer wall of the housing by a bolt inserted into the bolt hole. In addition, a portion (so-called "projection") protruding toward the inner wall of the case when the bolt hole is formed can be made to be the first interference portion. Thereby, the functions of the first interference portion and the bolt hole can be integrated.

Drawings

Fig. 1 is an exploded view of an electricity storage device according to an embodiment.

Fig. 2 is a plan view of the battery pack according to the embodiment.

Fig. 3 is an enlarged view of a portion III of fig. 2.

Fig. 4 is a sectional view taken along line IV-IV of fig. 3.

Fig. 5 is a view in the direction of V of fig. 2.

Fig. 6 is an enlarged view of a VI portion of fig. 2.

Fig. 7 is a perspective view of the battery module of the embodiment.

Fig. 8 is an exploded view of the battery module of the embodiment.

Fig. 9 is a plan view of the battery module according to the embodiment.

Fig. 10 is a perspective view of a connecting member of the embodiment.

Fig. 11 is an enlarged view of the xI portion of fig. 2.

Fig. 12 is a view from XII in fig. 11.

Fig. 13 is a view from XIII in fig. 6.

Description of reference numerals:

1 accumulator package (first accumulator package)

3 case

4 accumulator module

5 cover

8 connecting member

15 bolt hole

16 bolt

30 opening

31 case side interference part (first interference part of the invention)

37 bottom wall

39 outer wall

61 electric fittings

70 Battery Module body

71 accumulator cell

78 bottom plate (plate-shaped component of the invention)

86 main body part

87 third interference portion

88 bus

89 bus bar cover

90 terminal board

92 Module side interference part (second interference part of the invention)

95 terminal

D1 first direction

D2 second direction

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

(embodiment mode)

(Electrical storage device)

Fig. 1 is an exploded view of a power storage device 10 according to an embodiment.

Power storage device 10 is mounted on a vehicle such as an electric vehicle or a hybrid vehicle, and is used as a power source of the vehicle.

The power storage device 10 includes a first battery package 1 and a second battery package 2. The first battery package 1 and the second battery package 2 each include

battery modules

4 and 24 formed by stacking a plurality of battery cells 71 (see fig. 8). The first battery package 1 is arranged in a plurality of rows in a direction orthogonal to the stacking direction of the battery cells 71, which will be described in detail later.

In the following description, a direction along the stacking direction of the battery cells 71 in the battery modules 4 housed in the first battery pack 1 is referred to as a first direction D1, a direction perpendicular to the first direction D1 in which the plurality of battery modules 4 are arranged is referred to as a second direction D2, and a direction perpendicular to the first direction D1 and the second direction D2 is referred to as a third direction D3. The first battery package 1 may be simply referred to as a battery package 1.

(accumulator Package)

The battery pack 1 (first battery pack 1) includes a case 3, a plurality of battery modules 4, a connecting member 8, and a cover 5.

(case)

The housing 3 is formed in a box shape having a bottom wall 37 of a rectangular shape, a first side wall 38a, a second side wall 38b, a third side wall 38c, and a fourth side wall 38D rising from 4 sides of the bottom wall 37 toward one side in the third direction D3, and an opening 30 provided at an end portion of each of the

side walls

38a, 38b, 38c, and 38D on the opposite side from the bottom wall 37. The first side wall 38a faces the first direction D1 and is disposed on one side of the first direction D1. The second side wall 38b is disposed opposite the first side wall 38a and on the other side in the first direction D1. The third side wall 38c faces the second direction D2 and is disposed on one side of the second direction D2. The fourth side wall 38D is disposed opposite to the third side wall 38c and on the other side in the second direction D2. The housing 3 is formed by aluminum die casting, for example.

Fig. 2 is a plan view of the battery pack 1 according to the embodiment, as viewed from the third direction D3 side. In fig. 2, the cover 5 is not shown for the sake of illustration.

The housing 3 has a plurality of (4 in the present embodiment) housing-side interference portions 31 (first interference portions of the invention). Each housing-side interference portion 31 protrudes from the first side wall 38a of the housing 3 toward the inside of the housing 3. The case-side interference portion 31 is formed integrally with the case 3. The 4 case-side interference portions 31 are a first case-side interference portion 32, a second case-side interference portion 33, a third case-side interference portion 34, and a fourth case-side interference portion 35, respectively, in this order from one side to the other side in the second direction D2.

Fig. 3 is an enlarged view of a portion III of fig. 2. Fig. 4 is a sectional view taken along line IV-IV of fig. 3. Fig. 5 is a view in the direction of V of fig. 2.

As shown in fig. 3, the first case-side interference portion 32 is formed in a semicircular shape protruding inward of the case 3 in a plan view when viewed from the third direction D3. As shown in fig. 4, a bolt hole 15 is formed inside the first case-side interference portion 32. The bolt hole 15 is formed from the outer wall 39 of the housing 3 toward the inside. In other words, the boss 14 protruding toward the inside of the case 3 when the bolt hole 15 is formed becomes the first case-side interference portion 32. A bolt 16 is fixed to the bolt hole 15. An electrical component 61 is attached to the outer wall 39 of the housing 3 via a bolt 16 fixed to the bolt hole 15. The electrical component 61 is, for example, a wire harness 64 (see also fig. 5). In the present embodiment, the harness bracket 63 is attached to the outer wall 39 of the housing 3 via the bolt 16, and the harness 64 is held by the harness bracket 63, whereby the harness 64 is attached to the outer wall 39 of the housing 3.

As shown in fig. 2, the second housing-side interference portion 33 is formed in a semicircular shape protruding toward the inside of the housing 3 in a plan view.

Fig. 6 is an enlarged view of a VI portion of fig. 2.

The third case-side interference portion 34 is formed in an elongated shape that protrudes inward of the case 3 in a plan view and has a smaller width dimension in the second direction D2 than the second case-side interference portion 33.

The fourth housing-side interference portion 35 has the same shape as the second housing-side interference portion 33.

(accumulator module)

Returning to fig. 2, the battery module 4 is housed in the case 3. The battery module 4 is formed in a rectangular parallelepiped shape with the first direction as the longitudinal direction. The battery module 4 is provided in plurality. The plurality of battery modules 4 have the same configuration, and are disposed differently when housed in the case 3.

Fig. 7 is a perspective view of the battery module 4 according to the embodiment. Fig. 8 is an exploded view of the battery module 4 of the embodiment. Fig. 9 is a plan view of battery module 4 according to the embodiment. Since the plurality of battery modules 4 housed in the case 3 are all configured identically, a single battery module 4 will be described in the following description.

As shown in fig. 8, the battery module 4 is formed by stacking a plurality of battery cells 71. Specifically, the battery module 4 includes a battery module main body 70 (see fig. 7) and a bottom plate 78 (a plate-shaped member according to the present invention).

The battery module body 70 includes battery cells 71, separators 72, end separators 73, end plates 74, tightening members 75, bus plates 76, and a top cover 77.

In the battery module main body 70, first, 16 battery cells 71 each having a rectangular plate shape and having main surfaces arranged to face each other, and 15 rectangular plate-shaped separators 72 each made of a synthetic resin and arranged between the battery cells 71 are stacked while being alternately stacked, a pair of rectangular plate-shaped

end separators

73, 73 made of a synthetic resin are stacked outside the two battery cells 71, 71 at both ends, and a pair of

metal end plates

74, 74 are stacked outside the

end separators

73, 73. The 16 battery cells 71 are interchangeable members having the same shape, and the pair of

end separators

73, 73 have a shape different from that of the 15 separators 72.

In a state where the battery cell 71, the separator 72, the end separator 73, and the end plate 74 are stacked, both ends in the second direction D2 are covered with the tightening member 75, and the end plate 74 and the tightening member 75 are fastened and connected, thereby fixing the battery cell 71, the separator 72, the end separator 73, and the end plate 74. Specifically, the fastening portion 75a extending inward from both ends of the tightening piece 75 in the first direction D1 in the plane direction of the end plate 74 and the end plate 74 are overlapped and fastened in the first direction D1.

At this time, an insulator 79 made of synthetic resin for preventing the battery cell 71 and the tightening member 75 from being liquid-bonded (liquid junction) by dew condensation water is disposed between the battery cell 71, the separator 72, and the tightening member 75.

Next, the bus bar plate 76 is attached to one side of the stacked battery cells 71 and separators 72 in the third direction D3. The electrodes of the 16 battery cells 71 are electrically connected in series by a bus bar plate 76. A pair of

terminal plates

90, 90 are connected to both ends of the bus bar plate 76 in the first direction D1. Therefore, one terminal plate 90 of the pair of

terminal plates

90, 90 is on the high potential side (+ side), and the other terminal plate 90 is on the low potential side (-side). The pair of

terminal plates

90, 90 are provided at positions offset to one side from the middle portion of the bottom plate 78 in the second direction D2 (see also fig. 9). The pair of

terminal plates

90, 90 may be provided at positions shifted from the middle portion of the bottom plate 78 to the other side in the second direction D2. As shown in fig. 7,

terminals

95, 95 are formed on the

terminal plates

90, 90. Terminal plate covers 91 and 91 that can close the

terminals

95 and 95 are attached to the

terminal plates

90 and 90, respectively. Each of the terminal plate covers 91 and 91 is marked with a mark for identifying whether the corresponding

terminal

95 or 95 is on the high potential side (+ side) or the low potential side (-side).

The top cover 77 covers a part of the bus bar plate 76. Specifically, the top cover 77 is formed in a frame shape having a window in the center portion thereof for exposing a part of the bus bar plate 76. The battery module main body 70 is assembled by mounting the top cover 77.

The bottom plate 78 is mounted on the other side of the battery module main body 70 in the third direction D3. The battery module 4 is assembled by fitting the bottom plate 78 to the battery module main body 70. The bottom plate 78 is provided between the bottom wall 37 of the case 3 and the battery module main body 70 in a state where the battery module 4 is housed in the case 3. The bottom plate 78 is formed in a rectangular shape in plan view. The bottom plate 78 has a module-side interference portion 92 (second interference portion of the invention) and a case fixing portion 93.

The module-side interference portions 92 are formed at both ends of the bottom plate 78 in the first direction D1. The module-side interference portion 92 is formed to protrude outward in the first direction D1 along the surface direction of the bottom plate 78. As shown in fig. 9, the module-side interference portion 92 is provided at a position offset from the middle portion of the bottom plate 78 in the second direction D2. Specifically, the module-side interference portion 92 is disposed offset in the second direction D2 in the same direction as the pair of

terminal plates

90, 90.

The case fixing portions 93 are provided at 4 corners of the bottom plate 78 in a plan view. The case fixing portion 93 is a hole penetrating the bottom plate 78 in the third direction D3.

A mounting hole (not shown) is provided in the bottom wall 37 of the case 3 at a position corresponding to the case fixing portion 93, and the battery module 4 is fixed to the case 3 by passing a bolt (not shown) through the mounting hole and the case fixing portion 93.

As shown in fig. 2, the battery modules 4 formed in this manner are arranged in such a manner that the side surfaces in the short side direction of the rectangular parallelepiped shape are adjacent to each other, and are housed in the case 3. Specifically, the battery module 4 is provided in plural (4 in the present embodiment). The 4 battery modules 4 are a first battery module 41, a second battery module 42, a third battery module 43, and a fourth battery module 44 in this order from one side to the other side in the second direction D2. The 4 battery modules 4 are arranged such that the positions of the high potential side (+ side) and the low potential side (-side) of the terminal plate 90 alternate between one side and the other side in the first direction D1. In a state where each battery module 4 is housed in the case 3, a case-side interference portion 31 is provided on one side of the battery module 4 in the first direction. In this state, the module-side interference portion 92 projects outward where the housing 3 is located.

The first battery module 41 is disposed at a position overlapping the first case-side interference portion 32 when viewed in the first direction D1 (see also fig. 3). The first battery module 41 is disposed such that the terminal plate 90 on the low potential side (on the minus side) is positioned on the first case side interference portion 32 side in the first direction D1. At this time, the terminal plate 90 and the module-side interference portion 92 are positioned closer to the third side wall 38c than the intermediate portion of the first battery module 41 in the second direction D2. The first case-side interference portion 32 is located closer to the second battery module 42 than the middle portion of the first battery module 41. The state thus configured is defined as a first configuration state of the first battery module 41. The first arrangement state is a correct arrangement as intended by the designer. Therefore, in the first arrangement state of the first battery module 41, the module side interference portion 92 of the first battery module 41 does not interfere with the first case side interference portion 32, and the first battery module 41 can be assembled to the case 3.

The second battery module 42 is disposed at a position overlapping the second case-side interference portion 33 when viewed from the first direction D1. The second battery module 42 is disposed such that the terminal plate 90 on the high potential side (+ side) is positioned on the second case side interference portion 33 side in the first direction D1. At this time, terminal plate 90 and module-side interference portion 92 are located closer to first battery module 41 than the intermediate portion of second battery module 42 in second direction D2. The second case-side interference portion 33 is located closer to the third battery module 43 than the middle portion of the second battery module 42. The state thus configured is defined as a first configuration state of the second battery module 42. Therefore, in the first arrangement state of the second battery module 42, the module side interference portion 92 of the second battery module 42 does not interfere with the second case side interference portion 33, and the second battery module 42 can be assembled to the case 3.

The third battery module 43 is disposed at a position overlapping the third case-side interference portion 34 when viewed from the first direction D1 (see also fig. 6). The third battery module 43 is disposed such that the terminal plate 90 on the low potential side (on the minus side) is positioned on the third case-side interference portion 34 side in the first direction D1. The positional relationship of the terminal plate 90, the module-side interference portion 92, and the third case-side interference portion 34 in the third battery module 43 is equivalent to the positional relationship of the terminal plate 90, the module-side interference portion 92, and the first case-side interference portion 32 in the first battery module 41.

In the first arrangement state of the third battery module 43, the module-side interference portion 92 of the third battery module 43 does not interfere with the third case-side interference portion 34, and the third battery module 43 can be assembled to the case 3.

A junction block 66 is provided between the third battery module 43 and the second battery module 42. For example, a center bus bar 83 connecting the third battery module 43 and the second battery module 42, a sensor for checking and knowing the state of the battery module 4, and the like (not shown) are disposed in the junction block 66.

The fourth battery module 44 is disposed at a position overlapping the fourth case-side interference portion 35 when viewed in the first direction D1 (see also fig. 6). The fourth battery module 44 is disposed such that the terminal plate 90 on the high potential side (+ side) is positioned on the fourth case side interference portion 35 side in the first direction D1. The positional relationship of the terminal plate 90, the module-side interference portion 92, and the fourth case-side interference portion 35 in the fourth battery module 44 is equivalent to the positional relationship of the terminal plate 90, the module-side interference portion 92, and the second case-side interference portion 33 in the second battery module 42.

In the first arrangement state of the fourth battery module 44, the module-side interference portion 92 of the fourth battery module 44 does not interfere with the fourth case-side interference portion 35, and the fourth battery module 44 can be assembled to the case 3.

The first battery module 41, the second battery module 42, the third battery module 43, and the fourth battery module 44 arranged in this manner do not interfere with the case-side interference portion 31 and the module-side interference portion 92 when the battery modules are to be accommodated in the case 3 in the first arrangement state, and interfere with the case-side interference portion 31 and the module-side interference portion 92 when the battery modules are to be accommodated in the case 3 in the second arrangement state different from the first arrangement state. Here, the second arrangement state refers to, for example, a state in which the battery modules 4 are arranged in a reversed manner by 180 ° so that the high potential side (+ side) and the low potential side (-side) of the terminal plate 90 are switched in a plan view. In the second arrangement state, the module-side interference portion 92 and the case-side interference portion 31 are located in the same direction with respect to the middle portion of the battery module 4. Thus, in the second arrangement state, the battery module 4 cannot be assembled to the case 3 because the module-side interference portion 92 interferes with the case-side interference portion 31.

(connecting Member)

The connecting member 8 electrically connects the predetermined terminals 95 to each other at the terminals 95 (see fig. 7) located on the opposite side of the case-side interference portion 31 in the first direction D1 of the battery module 4. Specifically, the connecting member 8 has a first connecting member 81 and a second connecting member 82.

The first connecting member 81 connects a terminal 95 on the high potential side (+ side) of the first battery module 41 and a terminal 95 on the low potential side (-side) of the second battery module 42.

The second connecting member 82 connects a terminal 95 on the high potential side (+ side) of the third battery module 43 and a terminal 95 on the low potential side (-side) of the fourth battery module 44.

The first connecting member 81 and the second connecting member 82 have the same structure.

Fig. 10 is a perspective view of the connecting member 8 of the embodiment. Fig. 11 is an enlarged view of a portion XI of fig. 2. Fig. 12 is a perspective view (XII-direction view in fig. 11) showing an attached state of the connecting member 8 of the embodiment.

As shown in fig. 10, the connecting member 8 has a main body portion 86 and a third interference portion 87.

The main body 86 is formed in a band shape. The body portion 86 is disposed closer to the opening 30 of the case 3 than the terminal plate 90 of the battery module 4 (see also fig. 12). The body 86 has a concave portion 86a, a convex portion 86b, and an extending portion 86 c.

The concave portion 86a is recessed toward the bottom wall 37 of the case 3 in the mounted state of the connection member 8 to the battery module 4.

The protruding

portions

86b, 86b are connected to both longitudinal ends of the recessed portion 86a, and are formed to protrude toward the opening 30 of the housing 3.

The extending

portions

86c, 86c extend outward in the longitudinal direction from the end portions of the projecting

portions

86b, 86 b. A coupling hole 18 is formed at the tip end of the extension portion 86 c. The connection hole 18 penetrates the extension portion 86c in the thickness direction. The terminals 95 of the battery module 4 are fitted to the coupling holes 18, so that the terminals 95 are coupled to the coupling members 8.

The main body 86 includes a bus bar 88 and a bus bar cover 89.

The bus bar 88 is formed of a conductive material such as metal. The bus bar 88 is formed by, for example, performing press working on a metal plate such as copper.

The bus bar cover 89 is formed of an insulating material, and covers a part of the bus bar 88.

Specifically, the bus bar cover 89 covers substantially the entirety of the bus bar 88 except for the area near the connection hole 18 in the extension portion 86 c. In other words, the bus bar 88 is exposed to the outside in the area near the connection hole 18 in the extension portion 86 c. As shown in fig. 12, in a state where the connecting member 8 is connected to the terminal 95 of the battery module 4, the bus bar 88 is covered by the terminal plate cover 91. This suppresses the conductive bus bar 88 from being exposed to the outside in the mounted state, and ensures insulation between the bus bar 88 and another member when the bus bar 88 is in contact with the other member.

The third interference portion 87 protrudes from the convex portion 86b on the high potential side (+ side) toward the case 3 side in the first direction D1 in the attached state. The third interference portion 87 is provided integrally with the bus bar cover 89 of the main body portion 86. That is, the third interference portion 87 is formed of an insulating material. As shown in fig. 2 and 11, when the connecting member 8 is connected to a predetermined terminal 95 of the battery module 4 (that is, when the connecting member is connected by the arrangement as intended by the designer), the third interference portion 87 does not interfere with the case-side interference portion 31.

Here, fig. 13 is a perspective view (XIII view in fig. 6) showing a relationship between the case-side interference portion 31 and the third interference portion 87 according to the embodiment.

It is assumed that when the operator attempts to connect the connecting member 8 to another terminal 95 (the terminal 95 located on the housing-side interference portion 31 side in the first direction D1) different from the predetermined terminal 95, the third interference portion 87 of the connecting member 8 interferes with the housing-side interference portion 31 of the housing 3. This prevents the connecting member 8 from being erroneously assembled because the connecting member 8 cannot be attached to another terminal 95 different from the predetermined terminal 95.

As shown in fig. 2, a high potential side (+ side) terminal 95 of the second battery module 42 and a low potential side (-side) terminal 95 of the third battery module 43 are electrically connected to each other by a central bus bar 83 disposed on the terminal block 66.

The terminal 95 on the low potential side (on the minus side) of the first battery module 41 is connected to the second battery module 24 of the second battery package 2 via the side bus bar 84 disposed on the one side in the second direction D2 (see fig. 1).

A terminal 95 on the high potential side (+ side) of the fourth battery module 44 is connected to the second battery module 24 of the second battery package 2 via the side bus bar 84 disposed on the other side in the second direction D2 (see fig. 1).

(cover)

Returning to fig. 1, the cover 5 covers the opening 30 of the housing 3. The cover 5 is fastened and fixed to the housing 3 by fastening members such as bolts, not shown. A second battery pack mounting portion 51 is provided on an outward surface of the cover 5.

(second accumulator Package)

The second battery package 2 is provided on one side of the first battery package 1 (battery package 1) in the third direction D3. The length dimension of the second battery pack 2 in the first direction D1 is smaller than the length dimension of the first battery pack 1 in the first direction D1, and the length dimension of the second battery pack 2 in the second direction D2 is equal to the length dimension of the first battery pack 1 in the second direction D2.

The second battery package 2 includes a second case 22, a second battery module 24, and a second cover 26.

The second case 22 is attached to the second battery pack attachment portion 51 of the cover 5.

The second battery module 24 is disposed in the second case 22. The second battery module 24 is provided in plurality. The structure of each second battery module 24 is identical to the structure of the battery module 4 in the first battery package 1. The second battery module 24 may have a structure different from that of the battery module 4 in the first battery pack 1.

The second cover 26 covers the second case 22 and the second battery module 24 from one side in the third direction D3. As a result, second battery module 24 is housed in the space surrounded by second case 22 and second cover 26.

(action and Effect of accumulator Package)

Next, the operation and effect of the battery pack 1 will be described.

According to the battery pack 1 of the present embodiment, the case 3 has the case-side interference portion 31, the battery module 4 has the module-side interference portion 92, and when the battery module 4 is to be accommodated in the case 3 in the second arrangement state different from the first arrangement state, the case-side interference portion 31 interferes with the module-side interference portion 92. According to this configuration, even if the battery module 4 is erroneously assembled to the case 3 in the second arrangement state, the battery module 4 cannot be assembled, and therefore erroneous assembly of the battery module 4 can be prevented. The connecting member 8 has a third interference portion 87, and when the connecting member 8 is to be connected to another terminal 95 different from the predetermined terminal 95, the housing-side interference portion 31 interferes with the third interference portion 87. According to this configuration, even if the connecting member 8 is erroneously mounted to the other terminal 95 with respect to the housing 3, the mounting cannot be performed, and therefore, erroneous mounting of the connecting member 8 can be prevented.

Since the case side interference portion 31, the module side interference portion 92, and the third interference portion 87 are provided in the case 3, the battery module 4, and the connection member 8, respectively, to prevent the battery module 4 and the connection member 8 from being erroneously assembled, the structure of the battery pack 1 can be simplified and the number of components can be reduced as compared with the conventional art in which erroneous assembly is prevented by providing a separate cover member or the like. This makes it possible to reduce the weight of the battery pack 1, increase the proportion of the battery pack 1 in the case 3, and effectively use the space in the case 3.

Therefore, the battery pack 1 can be provided that can reliably prevent erroneous assembly of the battery module 4 and the connecting member 8 with a small and simple structure.

Since the battery module 4 has the bottom plate 78 provided between the bottom wall 37 of the case 3 and the battery module main body 70, the battery module 4 can be fixed to the bottom wall 37 of the case 3 through the bottom plate 78, for example. Since the module-side interference portion 92 is formed along the surface direction of the bottom plate 78, the bottom plate 78 can achieve both the fixing of the battery module 4 and the module-side interference portion 92.

Therefore, the number of components of the battery module 4 can be reduced. Further, since the bottom plate 78 of the battery module 4 is provided between the bottom wall 37 of the case 3 and the battery module main body 70, the module side interference portion 92 can be disposed close to the bottom wall 37 of the case 3. Therefore, a space can be secured on the opening 30 side of the housing 3, and the components such as the connecting member 8 can be disposed in the space. Therefore, the space in the case 3 can be effectively used, and the proportion of the battery pack 1 in the case 3 can be increased.

Since the module-side interference portions 92 are provided at both end portions of the bottom plate 78 in the first direction D1 and are arranged at positions offset from the middle portion of the bottom plate 78 in the second direction D2, for example, when the battery pack 1 is to be arranged in a state (second arrangement state) inverted by 180 ° in plan view from the first arrangement state, the position of the module-side interference portions 92 with respect to the housing 3 changes. With this configuration, the battery pack 1 can be reliably prevented from being arranged in the second arrangement state with respect to the case 3. Therefore, the battery pack 1 in which erroneous assembly of the battery module 4 is reliably prevented by a simple structure can be obtained.

Since the case-side interference portion 31 is provided at one side of the battery module 4 in the first direction D1 and the connecting member 8 is disposed at the other side of the battery module 4 in the first direction D1, for example, in the case where the connecting member 8 is erroneously disposed at one side of the battery module 4 in the first direction D1, the third interference portion 87 of the connecting member 8 interferes with the case-side interference portion 31.

This makes it impossible to assemble the connecting member 8, and therefore, erroneous assembly of the connecting member 8 can be reliably prevented.

Since the connecting member 8 includes the body portion 86 and the third interference portion 87, and the body portion 86 is disposed on the opening 30 side of the case 3 with respect to the terminal plate 90, the space on the opening 30 side with respect to the terminal plate 90 can be effectively used, and the battery pack 1 can be prevented from being increased in size in the first direction D1 and the second direction D2. Further, since the third interference portion 87 protrudes from the body portion 86 toward the housing 3 side and the housing-side interference portion 31 protrudes from the inner wall of the housing 3, the third interference portion 87 and the housing-side interference portion 31 can be reliably interfered with each other when the connecting member 8 is erroneously disposed. Therefore, the battery pack 1 in which the erroneous assembly of the connecting member 8 is reliably prevented can be obtained.

Since the third interference portion 87 is provided in the busbar cover 89, for example, in the case where the connecting member 8 is erroneously disposed, the case-side interference portion 31 and the busbar 88 can be prevented from directly interfering with each other. This can suppress damage to the bus bar 88 due to interference between the bus bar 88 and the case-side interference portion 31. Therefore, the performance of the bus bar 88 is suppressed from being lowered, and the safety of the battery package 1 can be maintained high.

In particular, when the housing 3 having the housing-side interference portion 31 is formed of a metal material, the third interference portion 87 is provided in the bus bar cover 89 formed of an insulating material, and thus insulation between the housing 3 and the connecting member 8 can be ensured when the housing-side interference portion 31 and the third interference portion 87 interfere with each other. Therefore, the battery pack 1 with improved safety can be obtained.

Since the housing 3 is formed by metal die casting, the housing-side interference portion 31 can be formed integrally with the housing 3. Therefore, the battery pack 1 can be easily manufactured and the number of components can be reduced. In particular, when the third interference portion 87 is formed of an insulating material, it is possible to ensure insulation between the case-side interference portion 31 of the case 3 and the third interference portion 87, and to facilitate manufacturing.

Since the bolt hole 15 is formed in the outer wall 39 of the housing 3, the electrical component 61 such as the wire harness 64 can be attached to the outer wall 39 of the housing 3 by the bolt 16 inserted into the bolt hole 15. In addition, when the bolt hole 15 is formed, a portion (so-called "boss 14") protruding toward the inner wall of the housing 3 can be made to be the housing-side interference portion 31. This enables the functions of the case-side interference portion 31 and the bolt hole 15 to be integrated.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

For example, the module-side interference portion 92 may be formed separately from the bottom plate 78.

The bottom plate 78 may be provided with a cooling pipe or the like for cooling the battery module 4. A cooling pipe or the like may be provided between the cover 5 of the first battery package 1 and the second case 22 in the second battery package 2.

The electrical component 61 attached to the outer wall 39 of the housing 3 may be an electrical component 61 other than a wire harness such as a connector or a sensor. Further, for example, components other than the electric component 61, such as a buffer member and a cooling pipe, may be attached.

The shape of the case-side interference portion 31 may be, for example, a shape other than a semicircular shape in cross section such as a rectangular shape, an elliptical shape, or a polygonal shape in a plan view when viewed from the third direction D3. In addition, although the structure in which the bolt holes 15 are formed inside the first case-side interference portion 32 has been described in the present embodiment, the bolt holes 15 may be formed inside the second case-side interference portion 33, the third case-side interference portion 34, and the fourth case-side interference portion 35.

The case-side interference portion 31 may be provided on the other side of the case 3 in the first direction D1.

In this case, it is preferable that the terminal 95 on one side in the first direction D1 of the battery module 4 is a predetermined terminal 95, and the connecting member 8 is attached on one side in the first direction D1.

The third interference portion 87 may be formed integrally with the bus bar 88. However, the structure of the present embodiment in which the third interference portion 87 is provided in the bus bar cover 89 is advantageous in that insulation between the housing 3 and the third interference portion 87 can be easily ensured.

The case-side interference portion 31 may be formed separately from the case 3.

In the present embodiment, the second arrangement state is a state in which the battery modules 4 are arranged by being turned 180 ° in a plan view, but is not limited to this. The second arrangement state may be any arrangement state different from the predetermined first arrangement state, which is the correct arrangement state, and any posture of the battery module 4 may be defined as the second arrangement state. That is, the battery module 4 may be configured such that the case-side interference portion 31 and the module-side interference portion 92 interfere with each other in any arrangement state other than the first arrangement state.

In the present embodiment, the power storage device 10 has a two-layer structure including the first battery package 1 and the second battery package 2, but is not limited thereto. The second battery pack 2 may not be provided. That is, power storage device 10 may have only a single-layer structure of first battery package 1. In addition, 3 or more battery packages may be provided.

In addition, the components in the above embodiments may be replaced with known components as appropriate without departing from the scope of the present invention, and the above embodiments may be combined as appropriate.

Claims

1. A battery pack characterized in that,

the battery package is provided with:

a housing having a first interference portion protruding inward;

a cover covering the opening of the housing;

a plurality of battery modules accommodated in the case in a first arrangement state and having second interference portions protruding toward an outer side where the case is located; and

a connecting member electrically connected to a predetermined terminal of the battery module and having a third interference portion,

the first interference portion and the second interference portion interfere with each other when the battery module is to be housed in the case in a second arrangement state different from the first arrangement state,

when the connecting member is to be connected to another terminal different from the predetermined terminal, the first interference portion and the third interference portion interfere with each other.

2. The battery package according to claim 1,

the battery module has a plate-shaped member that is provided between the bottom wall of the case and the battery module main body and that is formed in a rectangular shape in a plan view when viewed from the opening side,

the plate-like member has the second interference portion formed to protrude outward in a plane direction.

3. The battery package according to claim 2,

the battery module is formed by stacking a plurality of rectangular plate-shaped battery cells in a first direction in which the battery cells are arranged to face each other,

the second interference portions are provided at both ends of the plate-shaped member in the first direction, protrude in the first direction, and are disposed at positions offset from a middle portion of the plate-shaped member in a second direction perpendicular to the first direction and in which the plurality of battery modules are arranged.

4. The battery package according to claim 3,

the first interference portion is disposed at one side of the first direction with respect to the battery module,

the battery module has the terminals at both ends in the first direction,

the predetermined terminals of the two battery modules adjacent in the second direction, which are provided on the other side in the first direction, are connected to each other by the connecting member.

5. The battery pack according to claim 3 or 4,

the battery module has a terminal plate to which the connection member can be assembled from the opening side,

the terminal plate is formed with the terminal to which the connection member is connected,

the connecting member has a body portion disposed closer to the opening side than the terminal plate, and the third interference portion protruding from the body portion toward the case side,

the first interference portion is formed to protrude from an inner wall of the housing.

6. The battery package according to any one of claims 1 to 5,

the connecting member includes a bus bar made of a conductive material, and a bus bar cover made of an insulating material covering at least a part of the bus bar,

the third interference portion is disposed on the busbar cover.

7. The battery package according to any one of claims 1 to 6,

the housing is a metal die cast article,

the first interference portion is formed integrally with the housing.

8. The battery package according to any one of claims 1 to 7,

the housing has a plurality of the first interference portions,

a bolt hole formed from an outer wall of the housing toward the inner side is provided inside at least one of the plurality of first interference portions,

the electrical fittings are mounted by bolts fixed to the bolt holes.