Electric storage device and 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 a plurality of battery cells, and a positive electrode side relay and a negative electrode side relay, and a case. The positive electrode side relay and the negative electrode side relay are arranged apart from each other in a vehicle width direction. The case accommodates the plurality of battery cells, and a positive electrode side device and a negative electrode side device. The positive electrode side relay and the negative electrode side relay are arranged at a location near one end of the case with respect to the plurality of battery cells in a vehicle front-back direction. The case includes a structural member which is disposed between the plurality of battery cells and the positive electrode side and negative electrode side relays, and extending over the vehicle width direction.SELECTED DRAWING: Figure 3

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 the 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 above case, it is required for the battery pack to have a structure capable of suppressing an electrical short circuit between the positive electrode side device and the negative electrode side device when an impact load acts on the battery pack.

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

Means for Solving the Problems

[0006] The present disclosure first aspect relates to Power storage device is mounted on a vehicle. The power storage device includes a plurality of battery cells, a positive electrode side relay and a negative electrode side relay that are arranged apart from each other in the vehicle width direction. The positive electrode side relay and the negative electrode side relay are arranged at a location close to one end of the power storage device with respect to the plurality of battery cells in the vehicle longitudinal direction. A structural member extending in the vehicle width direction is provided between the positive electrode side relay and the negative electrode side relay and the plurality of battery cells. The positive electrode side relay is arranged on one side with respect to the center of the power storage device in the vehicle width direction, and the negative electrode side relay is arranged on the other side with respect to the center.

[0007] In the first aspect, the plurality of battery cells may include battery cell laminates adjacent to each other in the vehicle longitudinal direction. And the power storage device may further include a structural member arranged between the adjacent battery cell laminates and extending along the vehicle width direction.

[0008] The power storage device according to the second aspect of the present disclosure is mounted on a vehicle. The power storage device includes a plurality of battery cells, a positive electrode side relay and a negative electrode side relay that are arranged apart from each other in the vehicle width direction. The positive electrode side relay, the negative electrode side relay and the plurality of battery cells are arranged side by side in the vehicle longitudinal direction. The power storage device further includes a structural member arranged between the positive electrode side relay and the negative electrode side relay and the plurality of battery cells and extending in the vehicle width direction. The positive electrode side relay is arranged on one side with respect to the center of the power storage device in the vehicle width direction, and the negative electrode side relay is arranged on the other side with respect to the center.

[0009] In the second aspect, the plurality of battery cells may include battery cell laminates adjacent to each other in the vehicle longitudinal direction. And the power storage device may further include a structural member arranged between the adjacent battery cell laminates and extending along the vehicle width direction.

[0010] The power storage device according to the third aspect of the present disclosure is mounted on a vehicle. The power storage device includes a plurality of battery cells, a positive electrode side relay and a negative electrode side relay that are arranged apart from each other in the vehicle width direction, and an end wall formed so as to surround the plurality of battery cells, the positive electrode side relay, and the negative electrode side relay when viewed from above the vehicle. The positive electrode side relay and the negative electrode side relay are arranged at a position closer to one end of the end wall in the vehicle longitudinal direction than the plurality of battery cells. The power storage device further includes a structural member that is arranged between the positive electrode side relay and the negative electrode side relay and the plurality of battery cells and extends in the vehicle width direction. The positive electrode side relay is arranged on one side with respect to the center of the end wall in the vehicle width direction, and the negative electrode side relay is arranged on the other side with respect to the center.

[0011] In the third aspect, the plurality of battery cells may include battery cell laminates adjacent to each other in the vehicle longitudinal direction. And the power storage device may further include a structural member that is arranged between the adjacent battery cell laminates and extends along the vehicle width direction.

[0012] The battery pack according to the fourth aspect of the present disclosure is mounted on a vehicle. The battery pack includes a plurality of battery cells, a positive electrode side relay and a negative electrode side relay that are arranged apart from each other in the vehicle width direction, and a case that houses the plurality of battery cells, the positive electrode side relay, and the negative electrode side relay. The positive electrode side relay and the negative electrode side relay are arranged at a position closer to one end of the case in the vehicle longitudinal direction than the plurality of battery cells. The case includes a structural member that is arranged between the positive electrode side relay and the negative electrode side relay and the plurality of battery cells and extends in the vehicle width direction. The positive electrode side relay is arranged on one side with respect to the center of the case in the vehicle width direction, and the negative electrode side relay is arranged on the other side with respect to the center. In the fourth aspect, the plurality of battery cells may include battery cell laminates adjacent to each other in the vehicle longitudinal direction. And the battery pack may further include a structural member that is arranged between the adjacent battery cell laminates and extends along the vehicle width direction.

Advantages of the Invention

[0013] According to the battery pack related to the present disclosure The power storage device or when an impact load is input , impact it is possible to suppress an electrical short circuit between the positive electrode side , simple with a simple structure relay and the negative electrode side relay .

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. When referring to numbers such as the number of elements, quantity, amount, range, etc. in the embodiments shown below, unless otherwise specified or clearly specified by the principle, the technical idea according to the present disclosure is not limited to the mentioned numbers. Further, 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 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 battery cells 12, a positive electrode side relay 14, a negative electrode side relay 16, and a case 18. The battery cells 12 do not necessarily have to be plural and may be one, but basically are plural as illustrated in FIG. 1. The case 18 houses the battery cells 12, the positive electrode side relay 14, and the negative electrode side relay 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 (not shown) such as a bolt, but may be fixed by other methods such as welding. Only the positive electrode side vehicle mounting portion 20 and the negative electrode side vehicle mounting portion 22 on the front side of the vehicle, which are part of the vehicle mounting portion, are shown in FIG. 1. The vehicle mounting portions 20 and 22 are fastened to a vehicle structural member (for example, a suspension member) 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 bodies.

[0018] In the battery pack 10, a plurality of battery cells 12 are formed in a plate shape and stacked. 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 sets of stacked bodies of two battery cells 12 connected in series. These eight sets of stacked bodies are connected in series to form a battery assembly. Each stacked body of the battery cells 12 is fixed to the case 18 via a pair of end plates (not shown). 6 The positive electrode side

[0019] 14 and the negative electrode side relay 16 are arranged along the vehicle width direction D1 and are configured as separate units. The positive electrode side relay 14 and the negative electrode side relay 16 are arranged at a position close to one end of the case 18 (in the example shown in FIG. 1, the front - side end of the vehicle) in the vehicle front - rear direction D2 with respect to the plurality of battery cells 12 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. relay

[0020] relay The positive electrode side relay 14 and the negative electrode side , system 16 has, for example by a stem main relay to Specifically, the vehicle includes a power control unit (PCU) including an inverter to control the power supplied from the battery pack 10 to the electric motor. The positive electrode side and negative electrode side relays 14, 16 are respectively arranged between the battery assembly of the plurality of battery cells 12 and the PCU on the positive electrode side and the negative electrode 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 this 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 in the vehicle front-rear direction D2 (i.e., the vehicle rear side) 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 relay 14 and the negative electrode side relay 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 relay 14 and the negative electrode side relay 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), the outer wall of the case 18 (including the end wall 32) and the first and second skeletal structure members 24 and 26 form the positive electrode side relay A skeletal structure can be formed so as to surround 14. This also applies to the negative electrode side. relay The same applies to 16.

[0026] In addition, in the example shown in FIG. 1, between each adjacent laminate of the laminate of the 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 skeletal portion S.

[0027] Further, 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 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 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 (including the end wall 32) of the case 18 and the first and second skeletal structure members 24, 26. relay relay 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 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

[0028] relay relay ​​​16 is formed and arranged so as to avoid the negative electrode side frame structure member 30 within the space surrounded by the outer wall of the case 18 and the first and second frame structure members 24 and 26. Note that the case 18 does not necessarily have to include both the positive electrode side vehicle attachment portion 20 and the negative electrode side vehicle attachment portion 22, and may include 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 structures around the positive electrode side relay 14 and the negative electrode side relay 16. And FIG. 2 shows a situation in which 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 where the first frame structure member 24 is not provided, 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 move to the rear side of the vehicle on both the positive electrode side relay 14 side and the negative electrode side relay 16 side, and there is a possibility that both the positive electrode side relay 14 and the negative electrode side relay 16 will be damaged. As a result, there is a concern that an electrical short circuit may occur between the positive electrode side relay 14 and the negative electrode side relay 16.

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

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

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

[0034] And in the example shown in FIG. 1, the first skeleton 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 where the first skeleton structure member 44 extends only up to the second skeleton structure member 26 as shown in FIG. 3 described later, the first skeleton 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 by utilizing not only the second skeleton structure member 26 but also the end wall 34. That is, the movement of the first skeleton 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 can be more effectively suppressed from reaching the positive electrode side Relay 14 or the negative electrode side Relay 16 on the non-input side. In addition, in the example shown in FIG. 1, a skeleton structure member 36 extending in the vehicle width direction D1 is provided between the stacks of the adjacent battery cells 12 in the vehicle longitudinal direction D2. And the first skeleton structure member 24 is also connected to these skeleton structure members 36 corresponding to the skeleton portion S. Therefore, a structure that can more sufficiently receive the first skeleton structure member 24 with respect to the above input by utilizing the skeleton structure member 36 is obtained.

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

[0036] 3. Modified example The "first skeleton structure 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 modified example of the embodiment. The case 42 of the battery pack 40 shown in FIG. 3 includes a first skeleton structure member 44. The first skeleton structure member 44 is configured to connect only between the end wall 32 and the second skeleton structure member 26. That is, the ends of the first skeleton structure member 44 in the vehicle longitudinal direction D2 are supported by the second skeleton structure member 26 (skeleton part S). Therefore, even in such a configuration example, the impact load acting on the first skeleton structure member 24 from the vehicle longitudinal direction D2 can be received by the second skeleton structure member 26, so the positive electrode side Relay 14 and the negative electrode side Relay The effect of suppressing an electrical short circuit between 16 can be obtained.

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

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

[0039] Also, in the examples shown in FIGS. 1 to 4, the positive electrode side Relay 14 and the negative electrode side Relay 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 Relay " and the "negative electrode side Relay " 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 Relay and the negative electrode side Relay 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 thus the "second direction" is not limited to the vehicle longitudinal direction either.

Explanation of Reference Numerals

[0041] 10, 40, 50 Battery pack 12 Battery cell 14 Positive electrode side Relay 16 Negative electrode side Relay 18, 42, 52 Case of battery pack 20 Positive electrode side vehicle attachment portion 22 Negative electrode side vehicle attachment 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 power storage device mounted on a vehicle, A plurality of battery cells; A positive relay and a negative relay arranged apart from each other in a vehicle width direction; a case that accommodates the plurality of battery cells, the positive relay, and the negative relay; Equipped with the positive electrode relay and the negative electrode relay are disposed forward of the plurality of battery cells, the positive electrode relay is disposed on one side with respect to a center of the power storage device in the vehicle width direction, the negative relay is disposed on the other side of the center, The case includes a framework member that extends across the vehicle width direction and forms a framework of the case between the positive and negative relays and the plurality of battery cells. Energy storage device.

2. The power storage device according to claim 1 , the plurality of battery cells include battery cell stacks adjacent to each other in a vehicle front-rear direction, The case further includes a framework member that is disposed between the adjacent battery cell stacks and extends along the vehicle width direction to form a framework of the case. Energy storage device.

3. A power storage device mounted on a vehicle, A plurality of battery cells; A positive relay and a negative relay arranged apart from each other in a vehicle width direction; a case that accommodates the plurality of battery cells, the positive relay, and the negative relay; Equipped with the positive side relay and the negative side relay and the plurality of battery cells are arranged in line with each other at a front side of a vehicle, and the positive side relay and the negative side relay are arranged in line with each other at a rear side of the vehicle, the positive electrode relay is disposed on one side with respect to a center of the power storage device in the vehicle width direction, the negative relay is disposed on the other side of the center, The case includes a framework member that extends across the vehicle width direction and forms a framework of the case between the positive and negative relays and the plurality of battery cells. Energy storage device.

4. The power storage device according to claim 3, the plurality of battery cells include battery cell stacks adjacent to each other in a vehicle front-rear direction, The case further includes a framework member that is disposed between the adjacent battery cell stacks and extends along the vehicle width direction to form a framework of the case. Energy storage device.

5. A power storage device mounted on a vehicle, A plurality of battery cells; A positive relay and a negative relay arranged apart from each other in a vehicle width direction; an end wall of a case that accommodates the plurality of battery cells, the positive side relay, and the negative side relay, the end wall being formed so as to surround the plurality of battery cells, the positive side relay, and the negative side relay when viewed from above the vehicle; Equipped with the positive relay and the negative relay are disposed at a location closer to one end of the end wall at a front portion of the vehicle than the plurality of battery cells; the positive relay is disposed on one side with respect to a center of the end wall in the vehicle width direction, the negative relay is disposed on the other side of the center, The case includes a framework member that extends across the vehicle width direction and forms a framework of the case between the positive and negative relays and the plurality of battery cells. Energy storage device.

6. The power storage device according to claim 5, the plurality of battery cells include battery cell stacks adjacent to each other in a vehicle front-rear direction, The case further includes a member that is disposed between the adjacent battery cell stacks, extends along the vehicle width direction, and forms a framework of the case. Energy storage device.

7. A battery pack to be mounted on a vehicle, A plurality of battery cells; A positive relay and a negative relay arranged apart from each other in a vehicle width direction; a case that accommodates the plurality of battery cells, the positive relay, and the negative relay; Equipped with the positive electrode relay and the negative electrode relay are disposed forward of the plurality of battery cells, the positive relay is disposed on one side with respect to a center of the case in the vehicle width direction, the negative relay is disposed on the other side of the center, The case includes a framework member that extends across the vehicle width direction and forms a framework of the case between the positive and negative relays and the plurality of battery cells. Battery pack.

8. 8. The battery pack according to claim 7, the plurality of battery cells include battery cell stacks adjacent to each other in a vehicle front-rear direction, The case further includes a framework member that is disposed between the adjacent battery cell stacks and extends along the vehicle width direction to form a framework of the case. Battery pack.

Images