Battery cell grouping structure and battery module

Abstract

The utility model discloses a kind of battery cell grouping structure and battery module, wherein battery cell grouping structure includes: insulating component and multiple electric core of sequentially stacked, one side of each electric core is provided with a pair of tab, and each electric core is connected in series to form electric core group by tab;The edge of every two adjacent electric core forms edge gap;And in every two adjacent electric core, the tab of one electric core is connected with the tab of another electric core to form tab connection pair, and tab connection pair is bent in edge gap;Insulating component includes insulating spacer, and insulating spacer covers the exposed area of tab connection pair protruding from edge gap. Thus, it can form isolation space for tab connection pair, so as to separate tab connection pair and adjacent tab connection pair or tab;Thus, it can avoid the problem that tab is easily contacted short-circuit due to close distance, and further improve the safety of electric core.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell assembly structure and a battery module. Background Technology

[0002] With the rapid development of portable electronic devices, drones, electric vehicles, and other fields, higher requirements have been placed on the energy density, volume, and weight of batteries. To meet these demands, lithium battery design is gradually moving towards thinner, lighter, and higher energy density, thus giving rise to ultra-thin cell technology.

[0003] In the lithium battery market, there are still technical challenges and difficulties in assembling low-capacity, high-voltage battery packs composed of ultra-thin cells. For example, due to the thinness of the cells, the positive and negative tabs of adjacent cells are close together, which can easily lead to short circuits and poor safety performance. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cell assembly structure and battery module that can avoid short circuits caused by contact between the tabs of adjacent cells and improve battery safety.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A battery cell assembly structure includes: an insulating component and a plurality of sequentially stacked battery cells. Each battery cell has a pair of tabs on one side of its sealing edge, and the battery cells are connected in series through the tabs to form a battery cell assembly. The sealing edges on every two adjacent battery cells form a sealing edge gap. In every two adjacent battery cells, the tabs of one battery cell are connected to the tabs of the other battery cell to form a tab connection pair, and the tab connection pair is bent within the sealing edge gap. The insulating component includes an insulating isolator that covers the exposed area of ​​the tab connection pair protruding from the sealing edge gap.

[0007] In one embodiment, the tab connection pair includes a connecting portion, a first bent portion, and a second bent portion, the first bent portion and the second bent portion being bent into the sealing gap, and the connecting portion being located between the first bent portion and the second bent portion.

[0008] In one embodiment, the tab connection pair bent within the edge sealing gap has a "W" shaped structure.

[0009] In one embodiment, the insulating insulating element is insulating tape.

[0010] In one embodiment, in every two adjacent cells, the insulating tape is respectively adhered to the side of the two seals away from the seal gap, so that the insulating tape covers the exposed area of ​​the tab connection pair protruding from the seal gap.

[0011] In one embodiment, the insulating tape has a "U" shaped structure.

[0012] In one embodiment, the insulation assembly further includes an insulating scratch protector that wraps around the surface of each of the sealing edges.

[0013] In one embodiment, the insulating anti-scratch component is abrasion-resistant insulating protective tape.

[0014] In one embodiment, the wear-resistant insulating protective tape is a Teflon-based glass fiber reinforced tape.

[0015] A battery module comprising the above-mentioned cell assembly structure.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] The battery cell assembly structure of this utility model bends the tab connection pair formed by connecting two adjacent battery cells into the sealing gap between the two battery cells. At the same time, an insulating isolator covers the exposed area of ​​the tab connection pair protruding from the sealing gap, forming an isolation space for the tab connection pair, thereby separating the tab connection pair from its adjacent tab connection pair or tab. In this way, the problem of short circuit due to close proximity of the tabs can be avoided, thus improving the safety of the battery cell. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0019] Figure 1 This is a schematic diagram of the battery cell assembly structure in one embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the electrode tab welding method of two adjacent battery cells in one embodiment of the present invention;

[0021] Figure 3 for Figure 1 A schematic diagram of the battery cell assembly structure with insulation isolation components removed;

[0022] Figure 4 for Figure 3 A side view of the battery cell assembly structure with insulation components removed;

[0023] Figure 5 for Figure 4 A partially enlarged schematic diagram of the cell assembly structure in the diagram, showing the removal of the insulating isolation component at point A.

[0024] Figure 6 for Figure 1 A schematic diagram of the disassembled structure of the battery cell assembly. Detailed Implementation

[0025] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0026] Please see Figures 1-6 As shown, a battery cell group structure 10 includes: an insulating component 100 and a plurality of battery cells 200 stacked sequentially. Each battery cell 200 has a pair of tabs on one side of its sealing edge 210, and the battery cells 200 are connected in series through the tabs to form a battery cell group. The sealing edges 210 on every two adjacent battery cells 200 form a sealing gap 220. In every two adjacent battery cells 200, the tab of one battery cell 200 is connected to the tab of the other battery cell 200 to form a tab connection pair 230, and the tab connection pair 230 is bent within the sealing gap 220. The insulating component 100 includes an insulating isolator 110, which covers the exposed area of ​​the tab connection pair 230 protruding from the sealing gap 220.

[0027] It should be noted that the battery cell 200 is a soft-pack battery cell 200. After the soft-pack battery cell 200 is packaged with aluminum-plastic film, a sealing edge 210 is left. In order to facilitate the circuit connection of the battery cell 200, a pair of tabs (positive tab and negative tab) of the battery cell 200 will extend from the sealing edge 210, and the tabs are generally set on the top sealing edge 210 of the battery cell 200. After the battery cells 200 are stacked into a battery cell group, a sealing edge gap 220 will be formed between the top sealing edges 210 of two adjacent battery cells 200. In two adjacent battery cells 200, one tab of one battery cell 200 is connected to one tab of the other battery cell 200 to form a tab connection pair 230. The tab connection pair 230 is bent into the sealing edge gap 220, and then the exposed area of ​​the tab connection pair 230 protruding from the sealing edge gap 220 is covered by an insulating isolator 110, thereby forming an isolation space for the tab connection pair 230. In this way, the tab connection pair 230 can be separated from the adjacent tab connection pair 230 or the tab itself; thus, the problem of short circuit due to close proximity of the tabs can be avoided, thereby improving the safety of the cell 200.

[0028] It should also be noted that the cell assembly structure 10 of this invention enables the assembly of ultra-thin cells 200, which not only improves the safety of the ultra-thin cell assembly but also enhances the economics of battery production and reduces production costs. Furthermore, for cells 200 with metal lithium anodes or silicon-carbon anodes (high silicon content), the thickness expansion rate is relatively large during charging and discharging. Therefore, it is necessary to use large-size electrode sheets and ultra-thin cells 200 for assembly. Thus, the cell assembly structure 10 of this invention not only enables the assembly of such ultra-thin cells 200, which helps reduce the overall deformation of the battery pack and improves the cycle life of the battery pack, but also further enhances safety and achieves lightweight design.

[0029] Please see Figure 2 , Figure 4 and Figure 5 As shown, in one embodiment, the tab connection pair 230 includes a connecting portion 231, a first bent portion 232 and a second bent portion 233. The first bent portion 232 and the second bent portion 233 are bent into the sealing gap 220, and the connecting portion 231 is located between the first bent portion 232 and the second bent portion 233.

[0030] It should be noted that the connecting portion 231 refers to the part formed by welding the tabs of two adjacent cells 200, while the first bending portion 232 and the second bending portion 233 are the non-connecting areas of the tabs of two adjacent cells 200. The first bending portion 232 and the second bending portion 233 facilitate bending the tab connection pair 230 into the sealing gap 220. Then, the insulating separator 110 covers the exposed area of ​​the tab connection pair 230 protruding from the sealing gap 220. With the help of the insulating material of the outer layer of the aluminum-plastic film sealing and the insulating separator 110, an insulating space is formed for the tab connection pair 230, preventing short circuits between the tabs. Preferably, the tab connection pair 230 bent into the sealing gap 220 has a "W" shape. This not only reduces the risk of contact between adjacent tabs but also reduces the risk of contact between tabs and other components. It also effectively reduces the extra space occupied by the tabs, thereby improving the energy density of the battery module. In this embodiment, the tab pair 230 is formed into a connecting portion 231 by ultrasonic welding. This improves welding efficiency, welding strength, and welding accuracy, thereby improving the assembly quality of the battery cells 200. In this embodiment, the widths of the first bend 232 and the second bend 233 are both greater than the welding width of the connecting portion 231. This ensures that the connecting portion 231 is completely within the sealing gap 220, meaning that the tail end of the connecting portion 231 can be lower than the top end of the sealing edge, reducing the exposed size of the connecting portion 231 and thus reducing the space occupied by the tab pair 230.

[0031] In one embodiment, the insulating isolator 110 is insulating tape. Insulating tape has the advantages of convenient operation and strong adaptability, which can quickly complete the insulation protection of the tabs, improve production efficiency, and reduce costs. The insulating tape can be polyester tape, polyimide tape, glass cloth tape, etc. Specifically, in every two adjacent cells 200, the insulating tape is respectively pasted on the side of the two sealing edges 210 away from the sealing gap 220, so that the insulating tape covers the exposed area of ​​the tab connection pair 230 protruding from the sealing gap 220. This facilitates the pasting of the insulating tape, ensures sufficient pasting area, and improves the bonding strength. Preferably, the insulating tape has a "U" shaped structure, thereby forming an insulating protective cover for the tab connection pair 230 within the sealing gap 220, thus preventing contact short circuits of the tabs.

[0032] See also Figure 1 and Figure 6 As shown, in one embodiment, the insulation assembly 100 further includes an insulating anti-scratch member 120, which wraps around the surface of each sealing edge 210. Specifically, the insulating anti-scratch member 120 wraps around the top sealing edge 210 of the battery cell 200 where the tabs are located, thereby further improving the insulation protection effect. In this embodiment, since the tab connection pairs 230 of adjacent cells 200 need to be bent into the sealing gap 220, to avoid the tab connection pairs 230 or the bending tool coming into contact with the top sealing edge 210 during the bending process, which could cause damage to the aluminum-plastic film; and to prevent the cells 200 from undergoing slight displacement due to vibration, expansion, etc., during use of the battery module, which could cause the top sealing edge 210 to easily rub against the tabs, the insulating anti-scratch component 120 is a wear-resistant insulating protective tape. That is, the insulating anti-scratch component 120 uses a tape that has both insulating and wear-resistant protective functions, thereby improving the wear resistance of the top sealing edge 210 area, preventing damage to the aluminum-plastic film, and thus improving the sealing and safety of the cells 200. The wear-resistant insulating protective tape can be polyester tape, polyimide tape, or glass cloth tape, etc. Preferably, the wear-resistant insulating protective tape is a Teflon-based glass fiber reinforced tape. The Teflon-based glass fiber reinforced tape has high insulation, high temperature resistance, high wear resistance and high mechanical strength, thus further improving the protection of the sealing edge 210 and improving the safety of the battery module.

[0033] A battery module includes the aforementioned cell assembly structure 10.

[0034] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A cell assembly structure, characterized in that, include: Multiple battery cells are stacked sequentially, each cell having a pair of tabs on one side of its sealing edge, and the cells are connected in series via these tabs to form a cell group; the sealing edges of every two adjacent cells form a sealing edge gap; and in every two adjacent cells, the tabs of one cell are connected to the tabs of the other cell to form a tab connection pair, the tab connection pair being bent within the sealing edge gap; and An insulating assembly, the insulating assembly including an insulating spacer covering the exposed area of ​​the tab connection pair protruding from the sealing gap.

2. The cell assembly structure according to claim 1, characterized in that, The tab connection includes a connecting part, a first bent part, and a second bent part. The first bent part and the second bent part are bent into the edge sealing gap, and the connecting part is located between the first bent part and the second bent part.

3. The cell assembly structure according to claim 2, characterized in that, The tab connection pair, which is bent within the edge sealing gap, has a "W" shaped structure.

4. The cell assembly structure according to claim 1, characterized in that, The insulating insulating component is insulating tape.

5. The cell assembly structure according to claim 4, characterized in that, In each pair of adjacent cells, the insulating tape is respectively applied to the side of the two sealing edges away from the sealing edge gap, so that the insulating tape covers the exposed area of ​​the tab connection pair protruding from the sealing edge gap.

6. The cell assembly structure according to claim 5, characterized in that, The insulating tape has a "U" shaped structure.

7. The cell assembly structure according to any one of claims 1-6, characterized in that, The insulating assembly also includes an insulating scratch-resistant component, which is wrapped around the surface of each of the sealing edges.

8. The cell assembly structure according to claim 7, characterized in that, The insulating and scratch-resistant component is a wear-resistant insulating protective tape.

9. The cell assembly structure according to claim 8, characterized in that, The wear-resistant insulating protective tape is a Teflon-based glass fiber reinforced tape.

10. A battery module, characterized in that, Includes the cell assembly structure described in any one of claims 1-9.

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