Battery pack

Abstract

The utility model provides a battery pack capable of ensuring impact resistance. The battery pack is provided with battery packs formed by arranging a plurality of battery units and a containing shell with an opening on the upper surface for containing the plurality of battery packs, the containing shell is a cuboid, and a cross-shaped partition wall is arranged in the containing shell in a manner of being integrally constructed with the containing shell. The battery pack includes a partition wall connecting inner side surfaces facing each other in a longitudinal direction of the housing case and connecting inner side surfaces facing each other in a width direction orthogonal to the longitudinal direction of the housing case, and the battery pack includes a connection member that electrically connects adjacent battery packs across the partition wall.

Description

Technical Field

[0001] This utility model relates to a battery pack. Background Technology

[0002] Patent Document 1 discloses a power supply device that arranges an electrical connection box between multiple batteries. In the power supply device disclosed in Patent Document 1, by arranging the electrical connection box between multiple batteries, the distance from the electrical connection box to one end of the battery assembly and the distance from the electrical connection box to the other end of the battery assembly can be shortened, thereby reducing the length of the connecting members between them. Furthermore, in the power supply device disclosed in Patent Document 1, the first battery pack, the electrical connection box, and the second battery pack are arranged in a straight line.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2009-004323

[0004] However, in the power supply device disclosed in Patent Document 1, since there is no component to protect the battery, it may be damaged if it is subjected to an impact such as a collision. Utility Model Content

[0005] This invention was made in view of the above-mentioned problems, and its purpose is to provide a battery pack that can ensure impact resistance.

[0006] To address the aforementioned issues, the battery pack of this invention comprises a battery pack consisting of multiple battery cells arranged together and a housing having an opening on the upper surface of the housing containing the multiple battery cells. The housing is a cuboid, and a cross-shaped partition is integrally formed within the housing. This partition connects the inner surfaces of the housing that are opposite each other along the length direction and the inner surfaces of the housing that are opposite each other along the width direction orthogonal to the length direction of the housing. The battery pack has a connecting member that electrically connects adjacent battery cells to each other across the partition.

[0007] Therefore, compared to the case where the partition and the housing are separate components, the rigidity of the housing can be improved relative to the input load on the outside of the housing during a collision, thus ensuring impact resistance.

[0008] In addition, in the battery pack described above, wiring harness connection portions may also be provided at both ends of the length direction of the plurality of battery packs. These wiring harness connection portions are used for electrical connection with equipment components via wiring harnesses.

[0009] This increases the flexibility in handling the wiring harness that electrically connects the battery pack (battery group) to the equipment components, suppresses the cost increase caused by the increase in the length of the wiring harness and the volume increase caused by the handling of the wiring harness, and increases the flexibility in the mounting layout of the equipment components.

[0010] The battery pack involved in this invention ensures impact resistance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram showing the structure of the battery pack involved in the embodiment from above.

[0012] Figure 2 for Figure 1 The diagram shows the AA cross-section of the battery pack.

[0013] Figure 3 This diagram illustrates a first example of a change in the mounting layout of device components in the battery pack involved in the embodiment.

[0014] Figure 4 This is a diagram illustrating a second example in which the mounting layout of the device components has been changed in the battery pack involved in the embodiment. Detailed Implementation

[0015] The following describes embodiments of the battery pack involved in this utility model. However, this utility model is not limited to these embodiments.

[0016] Figure 1 This is a schematic diagram showing the structure of the battery pack 1 according to the embodiment from above. Figure 2 for Figure 1 The diagram shows a cross-sectional view (AA) of the battery pack 1. Additionally, the arrows Rr, UPR, and LH, appropriately indicated in each figure, represent the rearward direction, the upward direction, and the leftward direction of the vehicle using the battery pack 1 according to this embodiment, respectively. Hereinafter, unless otherwise specified, the rearward direction represents the width direction of the battery pack, the left-right direction represents the length direction of the battery pack, and the vertical direction represents the vertical direction of the battery pack.

[0017] The battery pack 1 according to the embodiment includes a housing 2, multiple first battery packs 3A, second battery packs 3B, third battery packs 3C, fourth battery packs 3D, and device components 6. Furthermore, in the following description, the first battery packs 3A, second battery packs 3B, third battery packs 3C, and fourth battery packs 3D are collectively referred to as battery packs 3A, 3B, 3C, and 3D, and unless otherwise specified, are simply referred to as battery pack 3.

[0018] The housing 2 is composed of a first sidewall 20A, a second sidewall 20B, a third sidewall 20C, a fourth sidewall 20D, a base plate 21, a first partition wall 22A, and a second partition wall 22B. It is a cuboid with an opening at the top in the vertical direction of the battery pack. In the housing 2, the first sidewall 20A, second sidewall 20B, third sidewall 20C, fourth sidewall 20D, base plate 21, first partition wall 22A, and second partition wall 22B are integrally formed. The housing 2 is formed, for example, by die casting of aluminum.

[0019] The first sidewall 20A is located at one end in the width direction of the battery pack, and the second sidewall 20B is located at the other end in the width direction of the battery pack. Additionally, the third sidewall 20C is located at one end in the length direction of the battery pack, and the fourth sidewall 20D is located at the other end in the length direction of the battery pack. The first sidewall 20A, the second sidewall 20B, the third sidewall 20C, and the fourth sidewall 20D are formed such that they rise upwards from the outer periphery of the base plate 21.

[0020] The first partition 22A extends in the width direction of the battery pack by connecting the inner surfaces of the opposing first sidewalls 20A and 20B. The second partition 22B extends in the length direction of the battery pack by connecting the inner surfaces of the opposing third sidewalls 20C and 20D. Viewed from above in the vertical direction of the battery pack, the first partition 22A and 22B intersect to form a cross-shaped partition connecting the opposing sides. The first partition 22A and 22B also function as support members that support the first sidewalls 20A, 20B, 20C, and 20D within the housing 2. The housing 2 is divided into four storage sections: a first storage section 200A, a second storage section 200B, a third storage section 200C, and a fourth storage section 200D by the first partition 22A and 22B. The first storage section 200A is formed by a first side wall 20A, a third side wall 20C, a first partition wall 22A, and a second partition wall 22B surrounding it. The second storage section 200B is formed by a first side wall 20A, a fourth side wall 20D, a first partition wall 22A, and a second partition wall 22B surrounding it. The third storage section 200C is surrounded by a second side wall 20B, a third side wall 20C, a first partition wall 22A, and a second partition wall 22B. The fourth storage section 200D is surrounded by a second side wall 20B, a fourth side wall 20D, a first partition wall 22A, and a second partition wall 22B.

[0021] Specifically, a first battery pack 3A is housed in the first storage section 200A. A second battery pack 3B is housed in the second storage section 200B. A third battery pack 3C is housed in the third storage section 200C. A fourth battery pack 3D is housed in the fourth storage section 200D. In the first storage section 200A, second storage section 200B, third storage section 200C, and fourth storage section 200D, the four battery packs 3A, 3B, 3C, and 3D are respectively housed through openings in the upper part of the storage housing 2 in the vertical direction of the battery pack.

[0022] The first battery pack 3A is configured such that multiple battery cells 31aA, 31bA, 31cA, 31dA, 31eA, 31fA, 31gA, 31hA, and 31iA are arranged along the length of the battery pack from the third sidewall 20C side toward the first partition wall 22A side. Furthermore, in the following description, unless otherwise specified, the multiple battery cells 31aA, 31bA, 31cA, 31dA, 31eA, 31fA, 31gA, 31hA, and 31iA are also simply referred to as battery cells 31A. In the first battery pack 3A, the positive and negative terminals of adjacent battery cells 31A are electrically connected to each other via multiple busbars 4 serving as connecting members. Thus, the multiple battery cells 31aA, 31bA, 31cA, 31dA, 31eA, 31fA, 31gA, 31hA, and 31iA are electrically connected in series.

[0023] Furthermore, wiring harness connection portions 32aA and 32bA are provided at both ends of the battery pack in the length direction of the first battery pack 3A. Specifically, in the battery cell 31aA located on the side closest to the third sidewall 20C in the length direction of the battery pack of the first battery pack 3A, a wiring harness connection portion 32aA is provided on the remaining terminals that are not electrically connected to the battery cell 31bA via the busbar 4. Additionally, in the battery cell 31iA located on the side closest to the first partition wall 22A in the length direction of the battery pack of the first battery pack 3A, a wiring harness connection portion 32bA is provided on the remaining terminals that are not electrically connected to the battery cell 31hA via the busbar 4.

[0024] The second battery pack 3B is configured such that multiple battery cells 31aB, 31bB, 31cB, 31dB, 31eB, 31fB, 31gB, 31hB, and 31iB are arranged along the length of the battery pack from the first partition wall 22A side towards the fourth side wall 20D side. Furthermore, in the following description, unless otherwise specified, the multiple battery cells 31aB, 31bB, 31cB, 31dB, 31eB, 31fB, 31gB, 31hB, and 31iB are also simply referred to as battery cells 31B. In the second battery pack 3B, the positive and negative terminals of adjacent battery cells 31B are electrically connected to each other via multiple busbars 4. Thus, the multiple battery cells 31aB, 31bB, 31cB, 31dB, 31eB, 31fB, 31gB, 31hB, and 31iB are electrically connected in series.

[0025] Furthermore, wiring harness connection portions 32aB and 32bB are provided at both ends of the battery pack in the length direction of the second battery pack 3B. Specifically, in the battery cell 31aB located on the side closest to the first partition wall 22A in the length direction of the battery pack of the second battery pack 3B, a wiring harness connection portion 32aB is provided on the remaining terminals that are not electrically connected to the battery cell 31bB via the bus 4. Additionally, in the battery cell 31iB located on the side closest to the fourth sidewall 20D in the length direction of the battery pack of the second battery pack 3B, a wiring harness connection portion 32bB is provided on the remaining terminals that are not electrically connected to the battery cell 31hB via the bus 4.

[0026] The third battery pack 3C is configured such that multiple battery cells 31aC, 31bC, 31cC, 31dC, 31eC, 31fC, 31gC, 31hC, and 31iC are arranged along the length of the battery pack from the third sidewall 20C towards the first partition wall 22A. Furthermore, in the following description, unless otherwise specified, the multiple battery cells 31aC, 31bC, 31cC, 31dC, 31eC, 31fC, 31gC, 31hC, and 31iC are also simply referred to as battery cells 31C. In the third battery pack 3C, the positive and negative terminals of adjacent battery cells 31C are electrically connected to each other via multiple busbars 4. Thus, the multiple battery cells 31aC, 31bC, 31cC, 31dC, 31eC, 31fC, 31gC, 31hC, and 31iC are electrically connected in series.

[0027] Furthermore, wiring harness connection portions 32aC and 32bC are provided at both ends of the battery pack along the length of the third battery pack 3C. Specifically, in the battery cell 31aC located on the side closest to the third sidewall 20C along the length of the battery pack of the third battery pack 3C, a wiring harness connection portion 32aC is provided on the remaining terminals that are not electrically connected to the battery cell 31bC via the busbar 4. Additionally, in the battery cell 31iC located on the side closest to the first partition wall 22A along the length of the battery pack of the third battery pack 3C, a wiring harness connection portion 32bC is provided on the remaining terminals that are not electrically connected to the battery cell 31hC via the busbar 4.

[0028] The fourth battery pack 3D is configured such that multiple battery cells 31aD, 31bD, 31cD, 31dD, 31eD, 31fD, 31gD, 31hD, and 31iD are arranged along the length of the battery pack from the first partition wall 22A side towards the fourth side wall 20D. Furthermore, in the following description, unless otherwise specified, the multiple battery cells 31aD, 31bD, 31cD, 31dD, 31eD, 31fD, 31gD, 31hD, and 31iD are also simply referred to as battery cells 31D. In the fourth battery pack 3D, the positive and negative terminals of adjacent battery cells 31D are electrically connected to each other via multiple busbars 4. Thus, the multiple battery cells 31aD, 31bD, 31cD, 31dD, 31eD, 31fD, 31gD, 31hD, and 31iD are electrically connected in series.

[0029] Furthermore, wiring harness connection portions 32aD and 32bD are provided at both ends of the battery pack in the length direction of the fourth battery pack 3D. Specifically, wiring harness connection portions 32aD are provided on the remaining terminals of the battery cell 31aD located on the side closest to the first partition wall 22A in the length direction of the battery pack of the fourth battery pack 3D that are not electrically connected to the battery cell 31bD via the bus 4. Additionally, wiring harness connection portions 32bD are provided on the remaining terminals of the battery cell 31iD located on the side closest to the fourth sidewall 20D in the length direction of the battery pack of the fourth battery pack 3D that are not electrically connected to the battery cell 31hD via the bus 4.

[0030] In the battery pack 1 according to the embodiment, the wiring harness connection portion 32aA of the battery cell 31aA provided in the first battery pack 3A and the wiring harness connection portion 32aC of the battery cell 31aC provided in the third battery pack 3C are electrically connected across the second partition 22B by the wiring harness 5A.

[0031] Furthermore, in the battery pack 1 according to the embodiment, the wiring harness connection portion 32bA of the battery cell 31iA provided in the first battery pack 3A and the wiring harness connection portion 32aB of the battery cell 31aB provided in the second battery pack 3B are electrically connected across the first partition 22A via the wiring harness 5B.

[0032] Furthermore, in the battery pack 1 according to the embodiment, the wiring harness connection portion 32bC of the battery cell 31iC provided in the third battery pack 3C and the wiring harness connection portion 32aD of the battery cell 31aD provided in the fourth battery pack 3D are electrically connected across the first partition 22A via the wiring harness 5C.

[0033] Device component 6 includes a system main relay or other electrical components. One of the positive and negative terminals of device component 6 is electrically connected to the wiring harness connection portion 32bB of the battery cell 31iB located in the second battery pack 3B, via a wiring harness 5D crossing the fourth sidewall 20D. The other terminal of device component 6 is electrically connected to the wiring harness connection portion 32bD of the battery cell 31iD located in the fourth battery pack 3D, via a wiring harness 5E crossing the fourth sidewall 20D.

[0034] In the battery pack 1 according to the embodiment, wire harness connecting portions 32 for electrically connecting to the device component 6 via wire harness 5 are provided at both ends of the battery pack length direction of each battery group 3A, 3B, 3C, and 3D. This increases the flexibility in handling the wire harness 5 that electrically connects the battery pack 1 (battery group 3) to the device component 6. Therefore, in the battery pack 1 according to the embodiment, it is possible to suppress cost increases caused by the increased length of the wire harness 5 and volume increases caused by wire harness handling, and to increase the flexibility in the mounting layout of the device component 6.

[0035] Figure 3 This diagram illustrates a first example where the mounting layout of device component 6 has been changed in the battery pack 1 according to the embodiment. Figure 3 The battery pack 1 shown adopts a mounting layout in which the device component 6 is arranged in the width direction of the battery pack 1.

[0036] exist Figure 1 The wiring harness connection portion 32bB of the battery cell 31iB, which was originally electrically connected to the device component 6 and located in the second battery pack 3B, in the battery pack 1 shown, is... Figure 3 The wiring harness connection 32bD of the battery pack 1 shown is electrically connected to the battery cell 31iD disposed in the fourth battery pack 3D via the wiring harness 5F across the second partition 22B.

[0037] Furthermore, one of the positive and negative terminals of device component 6 is electrically connected to the wiring harness connection portion 32bC of battery cell 31iC in the third battery pack 3C via wiring harness 5G across the second sidewall 20B. Additionally, the other of the positive and negative terminals of device component 6 is electrically connected to the wiring harness connection portion 32aD of battery cell 31aD in the fourth battery pack 3D via wiring harness 5H across the second sidewall 20B. Thus, in Figure 3In the battery pack 1 shown, the device component 6 is connected to... Figure 1 Compared to the case where the battery pack 1 shown is electrically connected to the wiring harness connectors 32bB and 32bD, the lengths of the wiring harnesses 5G and 5H can be shortened.

[0038] Figure 4 This diagram illustrates a second example where the mounting layout of device component 6 has been changed in the battery pack 1 according to the embodiment. Figure 4 The battery pack 1 shown adopts a mounting layout in which the device component 6 is mounted on the battery pack 1.

[0039] exist Figure 1 The wiring harness connection portion 32bB of the battery cell 31iB, which was originally electrically connected to the device component 6 and located in the second battery pack 3B, in the battery pack 1 shown, is... Figure 4 The wiring harness connection 32bD of the battery pack 1 shown is electrically connected to the battery cell 31iD disposed in the fourth battery pack 3D via the wiring harness 5F across the second partition 22B.

[0040] Furthermore, one of the positive and negative terminals of device component 6 is electrically connected to the wiring harness connection portion 32bA of the battery cell 31iA in the first battery pack 3A via a wiring harness 5I crossing the first sidewall 20A. Additionally, the other of the positive and negative terminals of device component 6 is electrically connected to the wiring harness connection portion 32aB of the battery cell 31aB in the second battery pack 3B via a wiring harness 5J crossing the first sidewall 20A. Thus, in Figure 4 In the battery pack 1 shown, the device component 6 is connected to... Figure 1 Compared to the case where the battery pack 1 shown is electrically connected to the wiring harness connectors 32bB and 32bD, the lengths of the wiring harnesses 5I and 5J can be shortened.

[0041] Furthermore, in the battery pack 1 according to the embodiment, a cross-shaped partition, where the first partition 22A and the second partition 22B intersect, is integrally formed with the first sidewall 20A, the second sidewall 20B, the third sidewall 20C, the fourth sidewall 20D, and the base plate 21 in the housing 2. Therefore, compared to the case where the cross-shaped partition (first partition 22A and second partition 22B) and the housing 2 (first sidewall 20A, second sidewall 20B, third sidewall 20C, fourth sidewall 20D, and base plate 21) are separate components, it is possible to improve the resistance to external input from the housing 2 during a collision. Figure 1 The load F shown indicates that the shell is rigid, thus ensuring impact resistance.

[0042] Furthermore, in the embodiment, each battery pack 3A, 3B, 3C, and 3D in the battery pack 1 may be composed of multiple battery cells 31, multiple partitions disposed between adjacent battery cells 31, and a pair of end plates disposed at both ends of the battery pack 3. Additionally, in the battery pack 1 according to the embodiment, a busbar may be used instead of a wiring harness as a connecting member that electrically connects adjacent battery packs 3 across the first partition 22A or the second partition 22B. Furthermore, in the battery pack 1 according to the embodiment, a wiring harness may be used instead of a busbar as a connecting member that electrically connects the positive and negative terminals of adjacent battery cells 31 to each other.

Claims

1. A battery pack comprising a battery assembly consisting of a plurality of battery cells arranged together and a housing having an opening on the upper surface of the housing of the plurality of battery cells, the housing being a cuboid, characterized in that, Inside the storage housing, a cross-shaped partition is integrally formed with the storage housing. This partition connects the inner surfaces of the storage housing that are opposite each other along the length direction, and also connects the inner surfaces of the storage housing that are opposite each other along the width direction orthogonal to the length direction. The battery pack has a connecting component that spans the partition and electrically connects adjacent battery packs to each other.

2. The battery pack according to claim 1, characterized in that, The multiple battery packs are provided with wire harness connection parts at both ends along their length, which are used to electrically connect to equipment components via wire harnesses.

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