Battery modules and battery packs

Abstract

The present disclosure provides a battery module and a battery pack including cells and a CCS assembly, wherein the CCS assembly includes a plastic bracket, the plastic bracket having a positive electrode connecting hole and a negative electrode connecting hole, an adhesive injection hole on at least one side of the positive electrode connecting hole, gaps between cells being defined as adhesive injection cavities, and at least a portion of the adhesive injection cavities being exposed toward the top surface of the plastic bracket through the corresponding adhesive injection holes.

Description

[Technical Field]

[0001] This disclosure claims priority to a Chinese patent application filed with the China Patent Office on August 2, 2023, bearing application number 202322069043.2, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to battery technology, and more particularly to battery modules and battery packs. [Background technology]

[0003] The CCS (Cell Contact System) assembly of a cylindrical power battery module often consists of a plastic bracket and a bus bar arranged on the plastic bracket. In actual use, foam adhesive is often injected between the cells to improve the structural stability of the battery pack and reduce the possibility of heat diffusion. In the battery pack assembly process, the plastic bracket is usually first assembled to the tip of the cell, then the bus bar assembled to the plastic bracket and the cell are aligned and welded, and finally the foam adhesive is injected into the gap between the cells.

[0004] In the related art, a CCS assembly includes a bracket and multiple busbars, the busbars including multiple busbar units, two adjacent busbar units connected by a base material to form a single busbar, the busbar units including positive and negative electrode connection portions connected to each other, the bracket including end plates, a first surface of which is provided with multiple busbar mounting portions, a second surface of which is provided with multiple cell mounting portions, each cell mounting portion being provided with a positive electrode communicating hole and a negative electrode communicating hole, the positive electrode of a cell is electrically connected to the positive electrode connecting portion of one busbar unit through the positive electrode communicating hole and the negative electrode of the cell is electrically connected to the negative electrode connecting portion of another busbar through the negative electrode communicating hole, the positive electrode communicating hole and the negative electrode communicating hole are electrically isolated from each other by a rib, and two adhesive passage holes are provided above each cell, the two adhesive passage holes being provided symmetrically with respect to a first direction. After assembling the CCS assembly and the cells, the top of the cell is blocked from the bottom up with the corresponding adhesive passage hole, and when injecting the foam adhesive, the foam adhesive is injected from the top down through the gap between the busbar and the rib. However, to increase the compactness of the CCS assembly structure, the gap between the busbar and the rib is usually small, which makes it difficult to inject the foam adhesive and reduces the assembly efficiency of the battery pack. Summary of the Invention [Means for solving the problem]

[0005] To solve the above technical problems, the present disclosure provides a battery module and a battery pack.

[0006] In a first aspect, an embodiment of the present disclosure provides a battery module including a cell and a CCS assembly, the CCS assembly including a plastic bracket, a bar mounting portion for assembling individual bars provided on an upper surface of the plastic bracket, and a cell mounting portion for assembling the cells provided on a lower surface of the plastic bracket, wherein a positive electrode connecting hole and a negative electrode connecting hole are provided within the area of ​​the cell mounting portion, an adhesive injection hole is provided on at least one side of the positive electrode connecting hole, the cells are provided corresponding to the positive electrode connecting hole, the gap between any one cell and another adjacent cell is defined as an adhesive injection cavity, and at least a portion of the adhesive injection cavity is exposed toward the upper surface of the plastic bracket by the corresponding adhesive injection hole.

[0007] In a second aspect, an embodiment of the present disclosure provides a battery pack including the battery module described above. [Effects of the Invention]

[0008] The beneficial effects of the present disclosure are as follows:

[0009] (1) The adhesive injection hole located in the plastic bracket in the battery module of the present disclosure can expose the gap between two adjacent cells, which is advantageous in reducing the difficulty of injecting adhesive into the gap between two adjacent cells.

[0010] (2) The battery pack provided by the present disclosure employs the above-mentioned battery module, and the adhesive injection hole disposed in the plastic bracket of the battery module can expose the gap between two adjacent cells, which is advantageous in reducing the difficulty of injecting adhesive into the gap between two adjacent cells. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective structural schematic diagram of a portion of a module of a battery pack according to an embodiment of the present disclosure. [Figure 2] 1 is a schematic plan view of a part of a module of a battery pack according to an embodiment of the present disclosure; [Figure 3] FIG. 2 is a perspective structural schematic diagram of a portion of a module of a battery pack according to an embodiment of the present disclosure after removing some cells and bus bars. [Figure 4] FIG. 2 is a planar structural schematic diagram of a portion of a module of a battery pack according to an embodiment of the present disclosure after removing some cells and bus bars. [Figure 5] 1 is a schematic diagram of a bottom structure of a plastic bracket according to an embodiment of the present disclosure. [Figure 6] FIG. 1 is a perspective structural schematic diagram of a bus bar according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] 1 to 6, a battery module 10, specifically a cylindrical power battery module, includes cells 100 and a CCS assembly 20, and the CCS assembly 20 includes a plastic bracket 300 and a busbar 200 attached to the plastic bracket 300. As shown in FIGS. 2 and 6, in this embodiment, the busbar 200 includes four individual bars 201 connected by connectors 202. The operating principle of the busbar 200 connected in series and parallel to the cells 100 in the battery module 10 is described in detail in the Chinese patent with publication number CN218039705U, which is a prior art and will not be described in detail here.

[0013] Specifically, in this embodiment, as shown in FIGS. 4 and 5 , a bar mounting portion 305 for assembling the bar units 201 is provided on the upper surface of the plastic bracket 300, and a cell mounting portion 308 for assembling the cells 100 is provided on the lower surface of the plastic bracket 300, where a positive electrode communicating hole 302 and a negative electrode communicating hole 303 are provided within the area of ​​the cell mounting portion 308, an adhesive injection hole 304 is provided on at least one side of the positive electrode communicating hole 302, and the cells 100 are provided corresponding to the positive electrode communicating hole 302, and the gap between any one cell 100 and another adjacent cell 100 is defined as an adhesive injection cavity 101, and at least a portion of the adhesive injection cavity 101 is exposed toward the upper surface of the plastic bracket 300 by the corresponding adhesive injection hole 304. In this embodiment, multiple position limiting protrusions 301 are provided around the positive electrode communicating hole 302 to surround the positive electrode communicating hole 302, and the position limiting protrusions 301 are provided on the underside of the plastic bracket 300. The area surrounded by the multiple position limiting protrusions 301 around the same positive electrode communicating hole 302 constitutes the cell mounting portion 308 described above. That is, after the cell 100 is assembled to the cell mounting portion 308, it is positioned by the position limiting protrusions 301 provided to surround the positive electrode communicating hole 302. The bar mounting portions 305 are provided in one-to-one correspondence with the individual bars 201 of the bus bar 200, and a connection groove 306 for accommodating the connection portion 202 is provided between the bar mounting portions 305. The bar mounting portions 305 communicate with the connection groove 306, and both the bar mounting portion 305 and the connection groove 306 are surrounded by a rib 307. As shown in FIGS. 2 and 4 , after the bus bar 200 is assembled to the bar mounting portion 305, the positive electrode communicating hole 302 and the negative electrode communicating hole 303 are both shielded by the bus bar 200, and at least a portion of the adhesive injection cavity 101 is exposed toward the top surface of the plastic bracket 300 through the corresponding adhesive injection hole 304. Therefore, when injecting adhesive, the foamed adhesive can be easily and quickly injected into the adhesive injection cavity 101 (the gap between the cells 100) through the adhesive injection hole 304, making it easy to inject the adhesive.

[0014] In this embodiment, at least a portion of the adhesive injection hole 304 extends radially away from the corresponding cell 100. The adhesive injection hole 304 may have any shape as long as it can expose the adhesive injection cavity 101 toward the top surface of the plastic bracket 300, and its shape may be determined according to the layout of the bar mounting portion 305 and the cell mounting portion 308, and is not specifically limited herein. While ensuring the structural strength of the plastic bracket 300, the area of ​​the adhesive injection hole 304 should expose as much of the adhesive injection cavity 101 as possible to improve the efficiency of foam adhesive injection and reduce the difficulty of adhesive injection.

[0015] 4, preferably, an adhesive injection hole 304 is provided on both sides of the positive electrode connecting hole 302 in the width direction of the battery module 10. In this way, it is possible to expose a larger area of ​​the adhesive injection cavity 101 around the cell 100 corresponding to the positive electrode connecting hole 302, thereby further improving adhesive injection efficiency.

[0016] Furthermore, in the same bus bar 200, the adhesive injection holes 304 between two adjacent positive electrode communicating holes 302 corresponding to two adjacent bar units 201 penetrate each other. When installed in this manner, in four cells 100 connected in parallel by the same bus bar 200, the gap between two adjacent cells 100 can be fully exposed by the penetrating adhesive injection holes 304, further improving the efficiency of adhesive injection.

[0017] In this embodiment, the adhesive injection holes 304 that penetrate each other between two adjacent positive electrode communicating holes 302 constitute an adhesive injection region I, and the ratio of the area of ​​the adhesive injection region I to the area of ​​a single positive electrode communicating hole 302 is 0.8 to 1.4, and preferably the ratio of the area of ​​the adhesive injection region I to the area of ​​a single positive electrode communicating hole 302 is approximately 1.13. Specifically, in this embodiment, the area of ​​the adhesive injection region I is 450 mm 2 The area of ​​a single positive electrode through-hole 302 is 397 mm 2This arrangement can ensure that the plastic bracket 300 has good structural strength and can also ensure the efficiency of adhesive injection.

[0018] In this embodiment, a position limiting concave surface 3012 is provided on the side of the position limiting protrusion 301 facing the adjacent cell 100, and the position limiting concave surface 3012 is recessed in a direction away from the cell 100. In order to better limit the position of the cell 100, the position limiting concave surface 3012 is preferably an arcuate surface that fits into the peripheral side surface of the corresponding cell 100.

[0019] 5, in this embodiment, the six position limiting protrusions 301 are arranged in a surrounding manner to form a cell mounting portion 308. The contours of the mounting points of the six position limiting protrusions 301 are arranged coaxially with the corresponding positive electrode through-holes 302.

[0020] Weight-reducing holes 3011 are formed on the underside of the position limiting protrusions 301, and these weight-reducing holes 3011 communicate with the adjacent negative electrode communicating holes 303. The weight-reducing holes 3011 reduce the weight of the plastic bracket 300, thereby enabling a reduction in the material costs of the plastic bracket 300. Furthermore, when the foaming adhesive foams toward the busbar 200, the weight-reducing holes 3011 allow excess foaming adhesive to easily flow into and overflow from the gap between the bar element 201 and the rib 307 that surrounds the bar mounting portion 305, thereby reducing the likelihood of damage to the welded structure between the busbar 200 and the cells 100, which would otherwise occur if the foaming adhesive pushed up against the bar element 201 or the busbar 200. Specifically, the negative electrode through-hole 303 passes through the plastic bracket 300 and communicates with the corresponding bar mounting portion 305, and preferably, the inner wall of the rib 307 at least partially constitutes the inner wall of the negative electrode through-hole 303 corresponding to the bar mounting portion 305. This embodiment also provides a battery pack including the above-mentioned battery module 10. As shown in FIG. 2, the battery pack includes three battery modules 10 connected in series. The battery modules 10 of this battery pack have low adhesive injection difficulty and high efficiency, and the battery pack can be assembled efficiently.

[0021] Preferably, the three plastic brackets 300 corresponding to the three battery modules 10 in this embodiment are integrally formed. [Explanation of symbols]

[0022] 10—battery module, 100—cell, 101—adhesive injection cavity, 200—busbar, 201—bar unit, 202—connection portion, 300—plastic bracket, 301—position limiting protrusion, 3011—weight reduction hole, 3012—position limiting concave surface, 302—positive electrode connecting hole, 303—negative electrode connecting hole, 304—adhesive injection hole, 305—bar mounting portion, 306—connection groove, 307—rib, 308—cell mounting portion, I—adhesive injection area, 20—CCS assembly.

Claims

1. A battery module (10) comprising a cell (100) and a CCS assembly (20), the CCS assembly (20) comprising: The plastic bracket (300) includes a bar mounting portion (305) on the upper surface of the plastic bracket (300) for assembling the bar unit (201), and a cell mounting portion (308) on the lower surface of the plastic bracket (300) for assembling the cell (100). A positive electrode connecting hole (302) and a negative electrode connecting hole (303) are provided within the cell mounting portion (308), and an adhesive injection hole (304) is provided on at least one side of the positive electrode connecting hole (302); The cells (100) are arranged to correspond to the positive electrode through-holes (302), and the gap between any one of the cells (100) and the other adjacent cells (100) is defined as an adhesive injection cavity (101), and at least a portion of the adhesive injection cavity (101) is exposed to the upper surface of the plastic bracket (300) through the corresponding adhesive injection hole (304).

2. 2. The battery module (10) of claim 1, wherein at least a portion of the adhesive injection holes (304) extend along a radial direction of the corresponding cell (100) in a direction away from the cell (100).

3. 3. The battery module (10) according to claim 1 or 2, wherein the battery module (10) further includes a bus bar (200), the bus bar (200) includes a plurality of the bar units (201), and in the same bus bar (200), the adhesive injection holes (304) between two adjacent positive electrode communication holes (302) corresponding to two adjacent bar units (201) penetrate each other.

4. 4. The battery module (10) according to claim 3, wherein the adhesive injection holes (304) located between two adjacent positive electrode communicating holes (302) and penetrating each other form an adhesive injection region (I), and a ratio of a cross-sectional area of ​​the adhesive injection region (I) to a cross-sectional area of ​​a single positive electrode communicating hole (302) is 0.8 to 1.

4.

5. 3. The battery module (10) according to claim 1, wherein the adhesive injection holes (304) are provided on both sides of the positive electrode communicating hole (302) in the width direction of the battery module (10).

6. A plurality of position limiting protrusions (301) are provided around the positive electrode communicating hole (302) so as to surround the positive electrode communicating hole (302), and the position limiting protrusions (301) are provided on the lower surface of the plastic bracket (300), 2. The battery module (10) according to claim 1, wherein an area surrounded by a plurality of position limiting protrusions (301) positioned around the same positive electrode through-hole (302) constitutes the cell mounting portion (308).

7. The battery module (10) according to claim 6, wherein a position limiting concave surface (3012) is provided on the side of the position limiting protrusion (301) facing the adjacent cell (100), and the position limiting concave surface (3012) is recessed in a direction away from the cell (100).

8. The battery module (10) according to claim 7, wherein the position limiting concave surface (3012) is an arcuate surface.

9. The battery module (10) according to any one of claims 6 to 8, wherein a weight reduction hole (3011) is provided on the lower surface of the position limiting protrusion (301).

10. The negative electrode communication hole (303) passes through the plastic bracket (300) and communicates with the corresponding bar mounting portion (305), The bar mounting portion (305) is formed by being surrounded by a rib (307), and the inner wall of the rib (307) at least partially constitutes the inner wall of the negative electrode communicating hole (303) corresponding to the bar mounting portion (305), The battery module (10) according to claim 9, wherein the weight reduction hole (3011) communicates with the adjacent negative electrode communication hole (303).

11. A battery pack comprising the battery module (10) according to any one of claims 1 to 10.

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