Battery pack

Abstract

To provide a battery pack having a structure capable of suppressing an electrical short circuit between a positive electrode side device and a negative electrode side device with a simple structure when an impact load acts on the battery pack.SOLUTION: A battery pack is mounted on a vehicle. The battery pack includes one or more battery cells, and a positive electrode side device and a negative electrode side device, and a case. The positive electrode side device and the negative electrode side device are arranged along the first direction and configured separately. The case accommodates the one or more battery cells, the positive electrode side devices and the negative electrode side devices. The positive electrode side device and the negative electrode side device are arranged near one end of the case with respect to the one or more battery cells in a second direction perpendicular to the first direction when viewed from above the vehicle. The case extends along the second direction between the positive electrode side device and the negative electrode side device, and includes a first skeleton structure member formed to connect the end wall of the case on the one end side and a skeleton portion of the case.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a battery pack mounted on a vehicle.

Background Art

[0002] Patent Document 1 discloses an electrolytic solution regeneration device for a flow battery. This electrolytic solution regeneration device is configured to separately store the oxidized or reduced electrolytic solution in a positive electrode electrolytic solution storage unit and a negative electrode electrolytic solution storage unit. A battery module including the flow battery as a unit cell is used as a power source for a vehicle or the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, it is conceivable to accommodate positive electrode side devices and negative electrode side devices such as the positive electrode electrolytic solution storage unit and the negative electrode electrolytic solution storage unit described in Patent Document 1 together with one or more battery cells in a case of a battery pack. When such positive electrode side devices and negative electrode side devices are separately configured and arranged side by side in the case, it is required for the battery pack to have a structure capable of suppressing an electrical short circuit between the positive electrode side devices and the negative electrode side devices when an impact load acts on the battery pack.

[0005] The present disclosure has been made in view of the above-described problems, and an object thereof is to provide a battery pack having a structure capable of suppressing an electrical short circuit between a positive electrode side device and a negative electrode side device with a simple structure when an impact load acts on the battery pack.

Means for Solving the Problems

[0006] The battery pack according to the present disclosure is mounted on a vehicle. The battery pack includes one or more battery cells, a positive-side device and a negative-side device, and a case. The positive-side device and the negative-side device are arranged along a first direction and are separately configured. The case houses one or more battery cells, the positive-side device, and the negative-side device. The positive-side device and the negative-side device are arranged at a position close to one end of the case with respect to the one or more battery cells in a second direction orthogonal to the first direction when viewed from above the vehicle. The case includes a first skeletal structure member that extends along the second direction between the positive-side device and the negative-side device and is formed to connect between the end wall of the case on the one end side and the skeletal portion of the case.

[0007] The skeletal portion may be a second skeletal structure member that is disposed between the positive-side device, the negative-side device, and the one or more battery cells and extends along the first direction to form the skeleton of the case.

[0008] The skeletal portion may be an end wall of the case located on the opposite side of the one end in the second direction.

[0009] The skeletal portion may be a second skeletal structure member that is disposed between the positive-side device, the negative-side device, and the one or more battery cells and extends along the first direction to form the skeleton of the case. And the first skeletal structure member may be extended in the second direction so as to connect between the second skeletal structure member and the end wall of the case located on the opposite side of the one end in the second direction.

[0010] The battery pack may further include a positive-side vehicle attachment portion having a first fixing point with the vehicle at a position away from the end wall of the case on the one end side in the second direction on the side of the positive-side device in the first direction. And the case may include a positive-side skeletal structure member that extends along the second direction with a straight line passing through the first fixing point and parallel to the second direction as a central axis when viewed from above the vehicle and is formed to connect between the end wall of the case on the one end side and the second skeletal structure member.

[0011] The battery pack may further include a negative electrode side vehicle attachment portion having a second fixing point with the vehicle at a position away from the end wall of the case on the one end side in the second direction on the side of the negative electrode side device in the first direction. The case may include a negative electrode side skeletal structure member that extends along the second direction with a straight line passing through the second fixing point and parallel to the second direction as the central axis when the vehicle is viewed from above, and is formed to connect between the end wall of the case on the one end side and the second skeletal structure member.

[0012] The first direction may be the vehicle width direction of the vehicle. And the second direction may be the longitudinal direction of the vehicle.

Advantages of the Invention

[0013] According to the battery pack according to the present disclosure, by providing the above-described first skeletal structure member, when an impact load is input to the case from the second direction on the side of the positive electrode side device or the negative electrode side device, it is possible to make it difficult for both the positive electrode side device and the negative electrode side device to be damaged. Thus, according to this battery pack, an electrical short circuit between the positive electrode side device and the negative electrode side device can be suppressed with a simple structure.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the embodiments shown below, when referring to numbers such as the number of elements, quantity, amount, range, etc., unless otherwise specified or clearly specified by the principle, the technical idea according to the present disclosure is not limited to the mentioned number. Also, the structures and the like described in the embodiments shown below are not necessarily essential to the technical idea according to the present disclosure, unless otherwise specified or clearly specified by the principle.

[0016] 1. Structure of the battery pack FIG. 1 is a diagram schematically showing the structure of a battery pack 10 according to an embodiment. The battery pack 10 includes a battery cell 12, a positive-side device 14, a negative-side device 16, and a case 18. The battery cell 12 does not necessarily have to be plural and may be one, but basically it is plural as illustrated in FIG. 1. The case 18 houses the battery cell 12, the positive-side device 14, and the negative-side device 16. The battery pack 10 is mounted on a vehicle and supplies power to an electric motor for vehicle running. FIG. 1 shows the internal structure of the battery pack 10 when viewed from above the vehicle.

[0017] The case 18 has a substantially rectangular parallelepiped shape as an example. More specifically, the case 18 has a substantially rectangular parallelepiped skeletal structure as a basic structure. The case 18 includes a vehicle mounting portion and is fixed to a vehicle structural member via the vehicle mounting portion. Typically, the case 18 is fastened to the vehicle structural member at the vehicle mounting portion using a fastener such as a bolt (not shown), but it may be fixed by other methods such as welding. In FIG. 1, only the positive-side vehicle mounting portion 20 and the negative-side vehicle mounting portion 22 on the front side of the vehicle, which are part of the vehicle mounting portion, are shown. The vehicle mounting portions 20 and 22 are fastened to the vehicle structural members (e.g., suspension members) on the front side of the vehicle via fasteners. Note that the vehicle mounting portions 20 and 22 may be integrally formed with the case 18 or may be separate.

[0018] In the battery pack 10, a plurality of battery cells 12 are formed in a plate shape and are stacked and arranged. In an example shown in FIG. 1, the stacking direction of the battery cells 12 is parallel to the vehicle width direction (left - right direction of the vehicle) D1. However, the stacking direction is not particularly limited, and for example, it may be parallel to the vehicle front - rear direction D2. In an example shown in FIG. 1, the plurality of battery cells 12 have eight stacks of five battery cells 12 connected in series. These eight stacks are connected in series to form a battery assembly. Each stack of the battery cells 12 is fixed to the case 18 via a pair of end plates (not shown).

[0019] The positive - side device 14 and the negative - side device 16 are arranged along the vehicle width direction D1 and are configured as separate units. The positive - side device 14 and the negative - side device 16 are arranged at a location close to one end of the case 18 (the front - side end of the vehicle in the example shown in FIG. 1) with respect to the plurality of battery cells 12 in the vehicle front - rear direction D2 and are fixed to the case 18. In the example shown in FIG. 1, the vehicle front - rear direction D2 corresponds to an example of the "second direction" according to the present disclosure.

[0020] The positive - side device 14 and the negative - side device 16 are, for example, positive - side and negative - side relays (system main relays). Specifically, the vehicle includes a power control unit (PCU) including an inverter in order to control the power supplied from the battery pack 10 to the electric motor. The positive - side and negative - side relays 14, 16 are respectively arranged between the battery assembly of the plurality of battery cells 12 and the PCU on the positive - side and negative - side. In the example shown in FIG. 1, the vehicle width direction D1 corresponds to an example of the "first direction" according to the present disclosure.

[0021] The case 18 of the present embodiment includes a first skeletal structure member 24, a second skeletal structure member 26, a positive electrode side skeletal structure member 28, and a negative electrode side skeletal structure member 30. In the following description, the end wall of the case 18 on the one end side (i.e., the end on the vehicle front side) is referred to as the end wall 32. Also, the end wall of the case 18 located on the opposite side of the one end (i.e., the vehicle rear side) in the vehicle front-rear direction D2 is referred to as the end wall 34. The end walls 32 and 34 are also included in the skeletal structure members that form the skeleton of the case 18. In the example shown in FIG. 1, the end walls 32 and 34 extend along the vehicle width direction D1.

[0022] The second skeletal structure member 26 is disposed between the positive electrode side device 14 and the negative electrode side device 16 and the plurality of battery cells 12 (battery assembly), and extends along the vehicle width direction D1 to form the skeleton of the case 18.

[0023] The first skeletal structure member 24 extends along the vehicle front-rear direction D2 between the positive electrode side device 14 and the negative electrode side device 16, and is formed so as to connect between the end wall 32 on the one end side and the "skeletal part S" of the case 18. In the example shown in FIG. 1, first, the second skeletal structure member 26 corresponds to the skeletal part S (the "skeletal part" according to the present disclosure) here. That is, the first skeletal structure member 24 connects between the end wall 32 and the second skeletal structure member 26.

[0024] Also, in the example shown in FIG. 1, the end wall 34 located on the opposite side of the end wall 32 also corresponds to an example of the skeletal part S. That is, the first skeletal structure member 24 connects between the end wall 32 and the end wall 34. In other words, in the structural example shown in FIG. 1, the first skeletal structure member 24 extends in the vehicle front-rear direction D2 so as to connect between the end wall 32 and the second skeletal structure member 26 and also connect between the second skeletal structure member 26 and the end wall 34.

[0025] By providing the first and second skeletal structure members 24 and 26, when viewed from above the vehicle (i.e., as shown in FIG. 1), a skeletal structure can be formed so as to surround the positive electrode side device 14 by the outer wall (including the end wall 32) of the case 18 and the first and second skeletal structure members 24 and 26. The same applies to the negative electrode side device 16.

[0026] When added, in the example shown in FIG. 1, between each adjacent stack of battery cells 12 arranged in four rows along the vehicle longitudinal direction, a further skeletal structure member 36 is provided. Each skeletal structure member 36 extends along the vehicle width direction D1 in the same manner as the second skeletal structure member 26 to form a skeleton. Therefore, it can be said that each skeletal structure member 36 also corresponds to another example of the above-described skeleton portion S.

[0027] Furthermore, the above-described positive electrode side vehicle attachment portion 20 more specifically has a first fixing point P1 with the vehicle at a position away from the end wall 32 in the vehicle longitudinal direction D2 on the side of the positive electrode side device 14 in the vehicle width direction D1. And the positive electrode side skeletal structure member 28 extends along the vehicle longitudinal direction D2 with a straight line L1 passing through the first fixing point P1 and parallel to the vehicle longitudinal direction D2 as the central axis when viewed from above the vehicle, and is formed so as to connect between the end wall 32 and the second skeletal structure member 26. Note that the positive electrode side device 14 is formed and arranged so as to avoid the positive electrode side skeletal structure member 28 within the space surrounded by the outer wall of the case 18 (including the end wall 32) and the first and second skeletal structure members 24, 26.

[0028] Similarly, the negative electrode side vehicle attachment portion 22 has a second fixing point P2 with the vehicle at a position away from the end wall 32 in the vehicle longitudinal direction D2 on the side of the negative electrode side device 16 in the vehicle width direction D1. And the negative electrode side skeletal structure member 30 extends along the vehicle longitudinal direction D2 with a straight line L2 passing through the second fixing point P2 and parallel to the vehicle longitudinal direction D2 as the central axis when viewed from above the vehicle, and is formed so as to connect between the end wall 32 and the second skeletal structure member 26. And the negative electrode side device 16 is formed and arranged so as to avoid the negative electrode side skeletal structure member 30 within the space surrounded by the outer wall of the case 18 and the first and second skeletal structure members 24, 26. Note that the case 18 does not necessarily have both the positive electrode side vehicle attachment portion 20 and the negative electrode side vehicle attachment portion 22, and may have only one of them.

[0029] 2. Effects FIG. 2 is a diagram for explaining the effects of the structure of the battery pack 10 according to the embodiment. More specifically, FIG. 2 shows only the structure around the positive electrode side device 14 and the negative electrode side device 16 in the battery pack 10. And FIG. 2 shows a situation where a large impact load caused by a collision in the front part of the vehicle acts on the battery pack 10 via the negative electrode side vehicle attachment portion 22 as an example.

[0030] In the example without the first skeleton structure member 24, when an impact load as shown in FIG. 2 is input to the negative electrode side vehicle attachment portion 22, the case 18 is crushed so that the end walls 32 on both the positive electrode side device 14 side and the negative electrode side device 16 side move toward the rear side of the vehicle, and there is a possibility that both the positive electrode side device 14 and the negative electrode side device 16 will be damaged. As a result, there is a concern that an electrical short circuit may occur between the positive electrode side device 14 and the negative electrode side device 16.

[0031] On the other hand, as described above, the battery pack 10 of the present embodiment includes the first skeleton structure member 24 disposed between the positive electrode side device 14 and the negative electrode side device 16. The first skeleton structure member 24 extends along the vehicle front-rear direction D2 (second direction) and connects between the end wall 32 and the skeleton portion S of the case 18. As a result, when a large input is applied to the negative electrode side vehicle attachment portion 22 from the vehicle front-rear direction D2 as in the example shown in FIG. 2, the case 18 deforms as follows. That is, since the first skeleton structure member 24 functions as a reinforcing member, the case 18 deforms such that the portion of the end wall 32 located on the negative electrode side device 16 side with respect to the connection point P3 between the end wall 32 and the first skeleton structure member 24 in the vehicle width direction D1 (first direction) falls toward the negative electrode side device 16 side like a seesaw with the connection point P3 as a fulcrum. For this reason, only the negative electrode side device 16 is damaged, and it is less likely that the case 18 will deform so as to crush the positive electrode side device 14. That is, the impact on the positive electrode side device 14 is alleviated, and the positive electrode side device 14 is more easily protected. This is the same even when an impact load is input to the positive electrode side vehicle attachment portion 20, contrary to the example shown in FIG. 2. Only the positive electrode side device 14 is damaged, and the negative electrode side device 16 is more easily protected. In other words, the resistance of the battery pack 10 to impacts can be improved well.

[0032] As described above, by providing the first skeletal structure member 24, when an impact load is input to the case 18 from the vehicle front-rear direction D2 on the side of the positive electrode side device 14 or the negative electrode side device 16, it becomes possible to make it difficult for both the positive electrode side device 14 and the negative electrode side device 16 to be damaged. Thus, according to the structure of the battery pack 10, it becomes possible to suppress an electrical short circuit between the positive electrode side device 14 and the negative electrode side device 16 with a simple structure.

[0033] Further, the above-described effect obtained by using the first skeletal structure member 24 can be obtained even if the second skeletal structure member 26 is not provided. Moreover, according to the second skeletal structure member 26 extending in the vehicle width direction D1, a skeletal structure surrounding each of the positive electrode side device 14 and the negative electrode side device 16 can be formed by the cooperation of the outer wall (including the end wall 32) of the case 18 and the first skeletal structure member 24. Thereby, with respect to the input of the above-described impact load from the vehicle front-rear direction D2, deformation of the case 18 located around the positive electrode side device 14 or the negative electrode side device 16 on the side receiving the input can be effectively suppressed.

[0034] And in the example shown in FIG. 1, the first skeletal structure member 24 is connected (extended) to the end wall 34 on the side opposite to the end wall 32 that receives the input of the impact load. Thus, compared with an example in which the first skeletal structure member 44 extends only up to the second skeletal structure member 26 as in the example shown in FIG. 3 described later, the first skeletal structure member 24, on which the input of the impact load from the vehicle longitudinal direction D2 (the vehicle front side in FIG. 1) acts, can be received not only by the second skeletal structure member 26 but also by the end wall 34. That is, the movement of the first skeletal structure member 24 toward the vehicle rear side due to the input can be more sufficiently suppressed. As a result, the deformation of the case 18 (mainly the end wall 32) caused by the input reaching the positive electrode side device 14 or the negative electrode side device 16 on the non-input side can be more effectively suppressed. Additionally, in the example shown in FIG. 1, a skeletal structure member 36 extending in the vehicle width direction D1 is provided between the stacked bodies of the adjacent battery cells 12 in the vehicle longitudinal direction D2. And the first skeletal structure member 24 is also connected to these skeletal structure members 36 corresponding to the skeletal part S. Therefore, a structure for more sufficiently receiving the first skeletal structure member 24 against the above input by using the skeletal structure member 36 can be obtained.

[0035] Furthermore, the case 18 includes a positive electrode side skeletal structure member 28 and a negative electrode side skeletal structure member 30. Thereby, since the end wall 32 can be supported at the position where the above-described impact load from the vehicle longitudinal direction D2 acts, the deformation of the case 18 located around the positive electrode side device 14 or the negative electrode side device 16 on the side receiving the input of the impact load can be more effectively suppressed.

[0036] 3. Modification Example The "first skeleton structural member" according to the present disclosure may be configured as follows, for example. FIG. 3 is a diagram schematically showing the structure of a battery pack 40 according to a first modification of the embodiment. The case 42 of the battery pack 40 shown in FIG. 3 includes a first skeleton structural member 44. The first skeleton structural member 44 is configured to connect only between the end wall 32 and the second skeleton structural member 26. That is, the ends of the first skeleton structural member 44 in the vehicle front-rear direction D2 are supported by the second skeleton structural member 26 (skeleton part S). Therefore, even in such a configuration example, the impact load acting on the first skeleton structural member 24 from the vehicle front-rear direction D2 can be received by the second skeleton structural member 26, so that the effect of suppressing an electrical short circuit between the positive electrode side device 14 and the negative electrode side device 16 can be obtained.

[0037] FIG. 4 is a diagram schematically showing the structure of a battery pack 50 according to a second modification of the embodiment. The case 52 of the battery pack 50 shown in FIG. 4 includes a first skeleton structural member 24 similar to the case 18 shown in FIG. 1, but different from the case 18, it does not include the second skeleton structural member 26 and the skeleton structural member 36. Even in such a configuration example, the impact load acting on the first skeleton structural member 24 from the vehicle front-rear direction D2 can be received by the end wall 34 (skeleton part S) alone, so that the effect of suppressing an electrical short circuit between the positive electrode side device 14 and the negative electrode side device 16 can be obtained.

[0038] In addition, in an example including a skeleton structural member 36 disposed between laminated bodies of adjacent battery cells 12 as in the examples shown in FIGS. 1 and 3 described above, the "first skeleton structural member" according to the present disclosure may be configured to connect to a skeleton structural member 36 corresponding to another example of the "skeleton part S" instead of the end wall 34 or the second skeleton structural member 26.

[0039] Also, in the examples shown in FIGS. 1 to 4, the positive electrode side device 14 and the negative electrode side device 16 are arranged near the end wall 32 on the front side of the vehicle. However, instead of such an example, the "positive electrode side device" and the "negative electrode side device" according to the present disclosure may be arranged, for example, near the end wall of the case on the rear side of the vehicle. According to such an example, an effect of suppressing an electrical short circuit between the positive electrode side device and the negative electrode side device can be obtained against the input of an impact load from the rear side of the vehicle.

[0040] Also, in the "battery pack" according to the present disclosure, the "first direction" is not limited to the vehicle width direction D1, and therefore, the "second direction" is not limited to the vehicle longitudinal direction either.

Description of Reference Numerals

[0041] 10, 40, 50 Battery pack 12 Battery cell 14 Positive electrode side device 16 Negative electrode side device 18, 42, 52 Case of battery pack 20 Positive electrode side vehicle mounting portion 22 Negative electrode side vehicle mounting portion 24, 44 First skeletal structure member 26 Second skeletal structure member 28 Positive electrode side skeletal structure member 30 Negative electrode side skeletal structure member 32, 34 End wall 36 Skeletal structure member

Claims

1. A battery pack mounted on a vehicle, comprising: one or more battery cells; a positive electrode side device and a negative electrode side device arranged along a first direction and separately configured; a case that houses the one or more battery cells, the positive electrode side device, and the negative electrode side device; and the positive electrode side device and the negative electrode side device are arranged at a position close to one end of the case with respect to the one or more battery cells in a second direction orthogonal to the first direction when viewed from above the vehicle; the case includes a first skeleton structure member that extends along the second direction between the positive electrode side device and the negative electrode side device and is formed to connect between an end wall of the case on the one end side and a skeleton portion of the case; the skeleton portion is a second skeleton structure member that is arranged between the positive electrode side device, the negative electrode side device, and the one or more battery cells and extends along the first direction to form a skeleton of the case; the battery pack further includes a positive electrode side vehicle attachment portion having a first fixing point with the vehicle at a position away from the end wall of the case on the one end side in the second direction on the side of the positive electrode side device in the first direction; the case includes a positive electrode side skeleton structure member that extends along the second direction with a straight line passing through the first fixing point and parallel to the second direction as a central axis when viewed from above the vehicle and is formed to connect between the end wall of the case on the one end side and the second skeleton structure member; A battery pack characterized by the above.

2. A battery pack mounted on a vehicle, comprising: one or more battery cells; a positive electrode side device and a negative electrode side device arranged along a first direction and separately configured; a case that houses the one or more battery cells, the positive electrode side device, and the negative electrode side device; and the positive electrode side device and the negative electrode side device are arranged at a position close to one end of the case with respect to the one or more battery cells in a second direction orthogonal to the first direction when viewed from above the vehicle; the case includes a first skeleton structure member that extends along the second direction between the positive electrode side device and the negative electrode side device and is formed to connect between an end wall of the case on the one end side and a skeleton portion of the case; the skeleton portion is a second skeleton structure member that is arranged between the positive electrode side device, the negative electrode side device, and the one or more battery cells and extends along the first direction to form a skeleton of the case; The battery pack further includes a negative electrode side vehicle attachment portion having a second fixing point with the vehicle at a position away from the end wall of the case on the one end side on the side of the negative electrode side device in the first direction. The case includes a negative electrode side skeleton structure member formed so as to extend along the second direction with a straight line passing through the second fixing point and parallel to the second direction as a central axis when the vehicle is viewed from above, and to connect between the end wall of the case on the one end side and the second skeleton structure member. A battery pack characterized by the above.

3. A battery pack mounted on a vehicle, One or more battery cells, A positive electrode side device and a negative electrode side device arranged along the first direction and separately configured, A case that houses the one or more battery cells, the positive electrode side device, and the negative electrode side device, Comprising, The positive electrode side device and the negative electrode side device are arranged at a position closer to one end of the case with respect to the one or more battery cells in a second direction orthogonal to the first direction when viewed from above the vehicle. The case includes a first skeleton structure member formed so as to extend along the second direction between the positive electrode side device and the negative electrode side device, and to connect between the end wall of the case on the one end side and the skeleton portion of the case. The skeleton portion is a second skeleton structure member that is arranged between the positive electrode side device, the negative electrode side device, and the one or more battery cells, and extends along the first direction to form the skeleton of the case. The first skeleton structure member is extended in the second direction so as to connect between the second skeleton structure member and the end wall of the case located on the opposite side of the one end in the second direction. The battery pack further includes a positive electrode side vehicle attachment portion having a first fixing point with the vehicle at a position away from the end wall of the case on the one end side on the side of the positive electrode side device in the first direction. The case includes a positive electrode side skeleton structure member formed so as to extend along the second direction with a straight line passing through the first fixing point and parallel to the second direction as a central axis when the vehicle is viewed from above, and to connect between the end wall of the case on the one end side and the second skeleton structure member. A battery pack characterized by the above.

4. A battery pack mounted on a vehicle, One or more battery cells, A positive electrode side device and a negative electrode side device arranged along the first direction and separately configured, the one or more battery cells, and a case that houses the positive electrode side device and the negative electrode side device, are provided, when viewed from above the vehicle, the positive electrode side device and the negative electrode side device are arranged at a location close to one end of the case with respect to the one or more battery cells in a second direction orthogonal to the first direction, the case includes a first skeleton structure member that extends along the second direction between the positive electrode side device and the negative electrode side device and is formed so as to connect between the end wall of the case on the one end side and the skeleton portion of the case, the skeleton portion is a second skeleton structure member that is arranged between the positive electrode side device and the negative electrode side device and the one or more battery cells and extends along the first direction to form the skeleton of the case, the first skeleton structure member is extended in the second direction so as to connect between the second skeleton structure member and the end wall of the case located on the opposite side of the one end in the second direction, the battery pack further includes a negative electrode side vehicle attachment portion having a second fixing point with the vehicle at a position away from the end wall of the case on the one end side in the second direction on the side of the negative electrode side device in the first direction, the case includes a negative electrode side skeleton structure member that extends along the second direction with a straight line passing through the second fixing point and parallel to the second direction as a central axis when viewed from above the vehicle and is formed so as to connect between the end wall of the case on the one end side and the second skeleton structure member, A battery pack characterized by the above.

5. The first direction is the vehicle width direction of the vehicle, The second direction is the longitudinal direction of the vehicle The battery pack according to any one of claims 1 to 4, characterized by the above.

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