Battery pack

Abstract

The utility model relates to a battery pack, a battery module is accommodated in a shell, the battery module is formed by clamping and stacking a plurality of battery units by a pair of end plates, gaskets are arranged between the end plates and the shell, and mutually meshed concave and convex parts are arranged on the contact surfaces of the gaskets and the end plates. Concave and convex parts which are meshed with each other are arranged on the contact surfaces of the gasket and the shell. Therefore, the friction force between the gasket and the end plate and the friction force between the gasket and the shell can be improved, and the deviation of the battery module caused by vibration can be suppressed.

Description

Technical Field

[0001] The utility model relates to a battery pack. Background Art

[0002] Patent Document 1 discloses a battery module in which a gasket is inserted between an end plate and a case.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2021-140874

[0004] In the battery module disclosed in Patent Document 1, there is a possibility that positional displacement may occur due to vibration. Utility Model Content

[0005] The present invention is made in view of the above technical problems, and an object of the present invention is to provide a battery pack capable of suppressing deviation of a battery module caused by vibration.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions.

[0007] A battery pack, wherein a battery module is accommodated in a shell, wherein the battery module is composed of a plurality of battery cells clamped and stacked by a pair of end plates, a gasket is arranged between the end plate and the shell, and mutually meshing concave-convex portions are provided on the contact surfaces between the gasket and the end plate, and mutually meshing concave-convex portions are provided on the contact surfaces between the gasket and the shell.

[0008] The battery pack of the utility model can achieve the following technical effects: the friction between the gasket and the end plate and between the gasket and the shell can be improved, and the deviation of the battery module caused by vibration can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a diagram showing a schematic configuration of a battery pack according to an embodiment. DETAILED DESCRIPTION

[0010] The following describes an embodiment of the battery pack of the present invention. Note that the embodiment does not limit the present invention.

[0011] Figure 1 1 is a diagram showing a schematic configuration of a battery pack 1 according to an embodiment. The battery pack 1 according to the embodiment is configured to accommodate a battery module 3 in a lower case 2 of a battery case. The lower case 2 is a die-cast case having a bottom 21 and a pair of side walls 22 and 23. The pair of side walls 22 and 23 are arranged opposite to each other so as to sandwich the battery module 3 in the longitudinal direction of the battery module 3.

[0012] The battery module 3 has a plurality of battery cells 31, a plurality of resin frames 32, a pair of end plates 33, 34, a pair of gaskets 35, 36, and a restraining band not shown in the figure. In the battery module 3, a stacked body is formed by alternately stacking a plurality of battery cells 31 and a plurality of resin frames 32. The plurality of battery cells 31 are secondary batteries such as lithium-ion batteries or nickel-metal hydride batteries. The plurality of battery cells 31 have the same structure, and the stacked battery cells 31 are electrically connected in series. The plurality of resin frames 32 are respectively arranged between two adjacent battery cells 31 in the length direction (stacking direction) of the battery module 3. A pair of end plates 33, 34 are arranged at one end and the other end of the stacked body in the length direction (stacking direction). The pair of end plates 33, 34 are arranged in a manner of clamping the stacked body from both sides in the length direction (stacking direction). A plurality of restraining bands are arranged on the upper surface and the lower surface of the plurality of resin frames 32. The plurality of restraining bands mutually constrain the pair of end plates 33, 34 in the state of clamping the stacked body.

[0013] The gasket 35 is pressed between the end plate 33 of the battery module 3 and the side wall 22 of the lower case 2 on one side in the length direction of the battery pack 1. The gasket 36 is pressed between the end plate 34 of the battery module 3 and the side wall 23 of the lower case 2 on the other side in the length direction of the battery pack 1. By pressing the gaskets 35 and 36 at one end and the other end of the battery module 3 accommodated in the lower case 2, a certain restraining force is applied to stabilize the battery pack 1.

[0014] On one side in the length direction of the battery pack 1, the contact surface between the gasket 35 and the side wall portion 22 of the lower case 2 is provided with mutually meshing concave and convex portions. That is, a convex return shape portion 351 is provided on the upper part of the side surface 35a, which is the contact surface of the gasket 35 in contact with the side wall portion 22 of the lower case 2. In addition, a concave receiving shape portion 220 meshing with the return shape portion 351 of the gasket 35 is provided on the upper part of the side surface 22a, which is the contact surface of the side wall portion 22 of the lower case 2 in contact with the gasket 35.

[0015] On one side in the longitudinal direction of the battery pack 1, the contact surfaces of the gasket 35 and the end plate 33 are provided with mutually meshing concave and convex portions. That is, a convex return shape portion 352 is provided at the lower part of the side surface 35b, which is the contact surface of the gasket 35 in contact with the end plate 33. In addition, a concave receiving shape portion 330 meshing with the return shape portion 352 of the gasket 35 is provided at the lower part of the side surface 33a, which is the contact surface of the end plate 33 in contact with the gasket 35.

[0016] On the other side in the longitudinal direction of the battery pack 1, the contact surfaces of the gasket 36 and the side wall portion 23 of the lower case 2 are provided with concave and convex parts that mesh with each other. That is, a convex return shape part 361 is provided on the upper part of the side surface 36a of the gasket 36 that contacts the side wall portion 23 of the lower case 2. In addition, a concave receiving shape part 230 that meshes with the return shape part 361 of the gasket 36 is provided on the upper part of the side surface 23a of the side wall portion 23 of the lower case 2 that contacts the gasket 36.

[0017] On the other side in the longitudinal direction of the battery pack 1, the contact surfaces between the gasket 36 and the end plate 34 are provided with concave and convex parts that mesh with each other. That is, a convex return shape part 362 is provided at the lower part of the side surface 36b, which is the contact surface of the gasket 36 that contacts the end plate 34. In addition, a concave receiving shape part 340 that meshes with the return shape part 362 of the gasket 36 is provided at the lower part of the side surface 34a, which is the contact surface of the end plate 34 that contacts the gasket 36.

[0018] In the battery pack 1 according to the embodiment, convex return shape parts 351, 352, 361, 362 are provided on the gaskets 35 and 36, and concave receiving shape parts 220, 230, 330, 340 are provided on the side walls 22 and 23 of the lower case 2 and the end plates 33 and 34. As a result, the friction between the gaskets 35 and 36 and the end plates 33 and 34 and between the gaskets 35 and 36 and the side walls 22 and 23 of the lower case 2 can be increased, and the displacement of the battery module 3 caused by the vertical vibration of the battery pack 1 can be suppressed. In addition, by suppressing the displacement of the battery module 3 caused by the vertical vibration of the battery pack 1, the interference between the battery module 3 and the upper cover of the battery case can be avoided, and the vibration resistance and impact resistance of the battery module 3 can be ensured. In addition, by suppressing the displacement of the battery module 3 caused by the vertical vibration of the battery pack 1, the leakage of the cooling air in the battery pack 1 can be suppressed, and the cooling performance can be ensured.

Claims

1. A battery pack, characterized in that: A battery module is housed in the housing. The battery module is formed by stacking a plurality of battery cells sandwiched by a pair of end plates. A gasket is arranged between the end plate and the shell, The contact surfaces between the gasket and the end plate are provided with concave and convex portions that mesh with each other. The contact surfaces between the gasket and the housing are provided with concave and convex portions that mesh with each other.

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