Battery module

Abstract

The utility model discloses a battery module. The battery module comprises two end plates, two side plates and a battery core assembly, the battery cell assembly comprises a plurality of stacked battery cells, and the battery cells are connected in series and / or in parallel through busbars; the two end plates are oppositely arranged and are respectively positioned at the two ends of the battery cell assembly, and first insulating sheets are clamped between the end plates and the battery cell assembly; the two side plates are oppositely arranged and located on the two sides of the battery cell assembly respectively, a second insulation sheet is arranged between the side plates and the battery cell assembly in a clamped mode, the two ends of each side plate are fixedly connected with the two end plates respectively, and the side plates are elastic. According to the utility model, the internal pressure of the battery cell can be prevented from being too large, so that the service life of the battery cell is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the field of battery packs, in particular to a battery module. Background Art

[0002] Most of the existing battery modules have a housing with a frame structure to ensure high strength of the housing. However, when the battery cells inside the battery module are in use, gases are generated due to the decomposition of the materials inside the cells, causing the pressure inside the cells to increase continuously, resulting in an increase in the thickness dimension of the cells. Since the housing has high strength, it cannot provide enough accommodation space for the enlarged cells, and thus the pressure inside the cells cannot be reduced by expansion, leading to an increasing pressure inside the cells and affecting the lifespan of the cells.

[0003] In view of the above problems, it is necessary to study a battery module that can effectively extend the lifespan of battery cells. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery module that can effectively extend the lifespan of battery cells.

[0005] To achieve the above purpose, the solution of the utility model is as follows:

[0006] A battery module includes two end plates, two side plates and a battery cell assembly. The battery cell assembly includes a plurality of stacked battery cells, and each battery cell is connected in series and / or in parallel through a bus bar. The two end plates are arranged oppositely and are respectively located at both ends of the battery cell assembly. A first insulating sheet is clamped between the end plate and the battery cell assembly. The two side plates are arranged oppositely and are respectively located at both sides of the battery cell assembly. A second insulating sheet is clamped between the side plate and the battery cell assembly. Each end of each side plate is fixedly connected to the two end plates respectively, and the side plate has elasticity.

[0007] The first insulating sheet has two inwardly turned edges and two outwardly turned edges. The two inwardly turned edges of the first insulating sheet hold the battery cell assembly, and the two outwardly turned edges of the first insulating sheet hold the end plate.

[0008] The materials of the first insulating sheet and the second insulating sheet are PC.

[0009] Convex connecting pieces are respectively arranged at both ends of the side plate, and the connecting pieces at both ends of the side plate are respectively fixedly connected to the two end plates.

[0010] The side plate and the end plate are riveted by rivets.

[0011] The side plate is provided with weight-reducing holes.

[0012] The end plate is of a hollow structure, and there are a plurality of reinforcing plates inside the end plate.

[0013] The end plate is provided with at least two perforations.

[0014] The end plate is of a hollow structure, and there are multiple reinforcing plates inside the end plate, and the perforations penetrate through each reinforcing plate.

[0015] Notches are provided on the side surface of the end plate corresponding to the perforations.

[0016] After adopting the above scheme, the utility model fixes the battery cell assembly through two end plates and two side plates; wherein, the side plates are elastic, so that when the battery cells in the battery cell assembly expand in volume due to the generation of gas inside, the side plates will deform accordingly to provide a deformation space for the battery cells, thereby avoiding excessive internal pressure of the battery cells and effectively prolonging the service life of the battery cells. Description of the Drawings

[0017] Figure 1 is the structural decomposition of the battery module of the utility model Figure 1 。

[0018] Figure 2 is the structural decomposition of the battery module of the utility model Figure 2 。

[0019] Figure 3 is the structural schematic diagram of the battery module of the utility model.

[0020] Figure 4 is the partial structural schematic diagram of the battery module of the utility model.

[0021] Figure 5 is the structural schematic diagram of the end plate of the utility model.

[0022] Figure 6 is the structural schematic diagram of the side plate of the utility model.

[0023] Figure 7 is the cooperation schematic diagram of the battery module of the utility model and the chassis.

[0024] Label Description:

[0025] Battery module A,

[0026] End plate 1, reinforcing plate 11, perforation 12, notch 13,

[0027] Side plate 2, connecting piece 21, weight-reducing hole 22,

[0028] Battery cell assembly 3,

[0029] Battery cell 31,

[0030] Bus bar 32,

[0031] First insulating sheet 4, inner flanging 41, outer flanging 42,

[0032] The second insulating sheet 5,

[0033] The rivet 6,

[0034] The bolt B,

[0035] The chassis C. Specific implementation manners

[0036] In order to further explain the technical solution of the present utility model, the present utility model will be elaborated in detail below through specific embodiments.

[0037] As Figures 1 to 7 shown, the present utility model discloses a battery module A, which includes two end plates 1, two side plates 2 and a battery cell assembly 3; the battery cell assembly 3 includes a plurality of stacked battery cells 31, and each of the battery cells 31 is connected in series and / or in parallel through a bus bar 32; the two end plates 1 are oppositely arranged and are respectively located at both ends of the battery cell assembly 3, and a first insulating sheet 4 is clamped between the end plate 1 and the battery cell assembly 3; the two side plates 2 are oppositely arranged and are respectively located on both sides of the battery cell assembly 3, and a second insulating sheet 5 is clamped between the side plate 2 and the battery cell assembly 3, and both ends of each side plate 2 are fixedly connected to the two end plates 1 respectively, and the side plate 2 has elasticity.

[0038] In the present utility model, the present utility model fixes the battery cell assembly 3 through the two end plates 1 and the two side plates 2. Among them, the side plate 2 has elasticity. In this way, when the battery cell 31 in the battery cell assembly 3 expands in volume due to the generation of gas inside, the side plate 2 will deform accordingly to provide a deformation space for the battery cell 31, thereby avoiding excessive internal pressure of the battery cell 31 and effectively extending the service life of the battery cell 31.

[0039] In an embodiment of the present utility model, protruding connecting pieces 21 are respectively arranged at both ends of the side plate 2, and the connecting pieces 21 at both ends of the side plate 2 are respectively fixedly connected to the two end plates 1; arranged in this way, it helps the side plate 2 to deform. The connecting plate of the side plate 2 and the end plate 1 can be riveted through the rivet 6 to ensure the connection stability between the side plate 2 and the end plate 1. The side plate 2 can be provided with a weight-reducing hole 22. The setting of the weight-reducing hole 22 can reduce the material consumption and weight of the side plate 2, and at the same time is also beneficial to the deformation of the side plate 2. The side plate 2 can be made of spring steel through sheet metal processing.

[0040] In an embodiment of the present utility model, the materials of the first insulating sheet 4 and the second insulating sheet 5 can be PC or other insulating materials. The first insulating sheet 4 has two inwardly turned edges 41 and two outwardly turned edges 42; the two inwardly turned edges 41 of the first insulating sheet 4 hold the battery cell assembly 3, and the two outwardly turned edges 42 of the first insulating sheet 4 hold the end plate 1; arranged in this way, it can effectively prevent the first insulating sheet 4 from shifting.

[0041] In an embodiment of the present utility model, the end plate 1 is of a hollow structure, so as to reduce the material consumption and weight of the end plate 1. A plurality of reinforcing plates 11 are arranged inside the end plate 1 to ensure the strength of the end plate 1.

[0042] In an embodiment of the present utility model, at least two through holes 12 are provided on the end plate 1, so as to lock the battery module A of the present utility model in the chassis C of the battery pack through bolts B passing through the through holes 12. The through holes 12 can penetrate through each of the reinforcing plates 11. A notch 13 corresponding to the through holes 12 is provided on the side surface of the end plate 1, so that the bolts B do not protrude from the side surface of the end plate 1. The end plate 1 can be formed by an aluminum extrusion process and a sheet metal process. The total thickness of the end plate 1 only needs to meet the maximum outer diameter of the bolts B used and the operating space. The total thickness of the end plate 1 can be made to be 10-12 mm, and compared with the conventional end plate thickness, it can be reduced by 5-8 mm, which helps to save the width space of the battery module A; the outermost reinforcing plate 11 among the respective reinforcing plates 11 is used to bear the torque of the bolt B locking. Therefore, the strength of the outermost reinforcing plate 11 among the respective reinforcing plates 11 needs to be able to withstand the torque of the bolt B locking and the deformation of the battery module A caused by vibration and impact.

[0043] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by those of ordinary skill in the art shall be regarded as not departing from the patent scope of the present utility model.

Claims

1. A battery module, characterized in that: It includes two end plates, two side plates and a battery cell assembly; The battery cell assembly includes a plurality of stacked battery cells, and the battery cells are connected in series and / or in parallel through busbars; The two end plates are arranged oppositely and are respectively located at both ends of the battery cell assembly, and a first insulating sheet is clamped between the end plate and the battery cell assembly; The two side plates are arranged oppositely and are respectively located on both sides of the battery cell assembly, a second insulating sheet is clamped between the side plate and the battery cell assembly, and both ends of each side plate are fixedly connected to the two end plates respectively, and the side plate has elasticity.

2. The battery module according to claim 1, characterized in that: The first insulating sheet has two inwardly turned inward flanges and two outwardly turned outward flanges; the two inward flanges of the first insulating sheet hold the battery cell assembly, and the two outward flanges of the first insulating sheet hold the end plate.

3. The battery module according to claim 1, wherein: The materials of the first insulating sheet and the second insulating sheet are PC.

4. The battery module according to claim 1, characterized in that: Both ends of the side plate are respectively provided with protruding connecting pieces, and the connecting pieces at both ends of the side plate are respectively fixedly connected to the two end plates.

5. The battery module according to claim 1 or 4, characterized in that: The side plate and the end plate are riveted by rivets.

6. The battery module according to claim 1, wherein: The side plate is provided with weight-reducing holes.

7. The battery module according to claim 1, characterized in that: The end plate is of a hollow structure, and there are a plurality of reinforcing plates inside the end plate.

8. The battery module according to claim 1, wherein: The end plate is provided with at least two through holes.

9. The battery module according to claim 8, wherein: The end plate is of a hollow structure, and there are a plurality of reinforcing plates inside the end plate, and the through holes penetrate through the respective reinforcing plates.

10. The battery module according to claim 9, wherein: A notch is provided on the side surface of the end plate corresponding to the through hole.

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