Cover plate assembly, single battery, battery pack and electric equipment

Abstract

The utility model relates to a cover plate assembly, a single battery, a battery pack and electric equipment.The cover plate assembly comprises an electrode connecting piece and a cover plate body which are arranged side by side, the cover plate body is used for being welded to the end of a shell of the single battery, an insulating piece is arranged between the cover plate body and the electrode connecting piece, and the electrode connecting piece is welded to the end of the shell of the single battery. A protective layer is arranged on the peripheral wall of the insulating sheet and used for absorbing and / or reflecting laser beams when the cover plate body and the shell are subjected to laser welding. Therefore, the protection layer is added on the surface of the insulation sheet, the effect of laser on the insulation sheet when the cover plate body and the battery shell are welded is reduced, most laser energy can be reflected by utilizing the characteristic of a high-reflection material of the protection layer, the absorption of the insulation sheet on the laser is reduced, and the risks of deformation and burning loss of the insulation sheet caused by laser irradiation are effectively reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and in particular, to a cover plate assembly, a single battery, a battery pack, and an electrical device. Background Art

[0002] When welding the shell and the cover of a battery, since the distance from the insulating sheet to the shell-cover weld is relatively close, and laser scattering, reflection, etc. occur during welding, the insulating sheet made of materials such as PPS is damaged, resulting in battery scrapping.

[0003] With the continuous improvement of market demand, the design size of the battery is becoming more and more extreme. The distance from the conventional insulating sheet to the shell-cover weld at the edge of the cover plate is only about 3 mm. When welding the shell and the cover, the laser power for welding is relatively large, and most of the outer shells of the battery cells are made of reflective materials. Therefore, the laser used for welding and the reflected laser caused by the highly reflective material during welding are extremely likely to cause the insulating sheet of the battery cell pole column to burn out. Even if only a very small burn occurs in the organic structural parts such as the insulating sheet, or even no burn occurs, it is still possible that the organic structural parts are deformed due to absorbing part of the laser energy, resulting in a decrease in the service life and performance of the organic structural parts. Summary of the Utility Model

[0004] The purpose of the present disclosure is to provide a cover plate assembly, a single battery, a battery pack, and an electrical device to at least partially solve the problems existing in the related art.

[0005] To achieve the above purpose, the present disclosure provides a cover plate assembly, including an electrode connection piece and a cover plate body arranged side by side. Among them, the cover plate body is used to be welded to the end of the outer shell of a single battery, an insulating sheet is arranged between the cover plate body and the electrode connection piece, and a protective layer is arranged on the outer peripheral wall of the insulating sheet. The protective layer is used to absorb and / or reflect the laser beam when the cover plate body and the outer shell are laser welded.

[0006] Optionally, the material of the protective layer is metal.

[0007] Optionally, the protective layer is arranged on the outer peripheral wall of the insulating sheet by electroplating or spraying.

[0008] Optionally, the bottom end of the protective layer is flush with the bottom end of the insulating sheet, and the top end of the protective layer is lower than the top end of the insulating sheet.

[0009] Optionally, the distance t1 between the top end of the protective layer and the top end of the insulating sheet satisfies: 0.5 mm ≤ t1 ≤ 1.5 mm.

[0010] Optionally, the thickness t2 of the protective layer ≤ 0.1 mm.

[0011] Optionally, the material of the protective layer is ceramic.

[0012] Optionally, the protective layer is provided on the side wall of the insulating sheet by riveting.

[0013] Optionally, the insulating sheet is sleeved on the bottom wall and the side wall of the electrode connection piece.

[0014] Optionally, a groove for installing the insulating sheet is formed on the cover plate body.

[0015] Optionally, an electrode lead-out piece is provided at one end of the cover plate body away from the electrode connection piece, a pole column is provided on the electrode lead-out piece, and the pole column sequentially passes through the cover plate body and the electrode connection piece.

[0016] Optionally, a spacer is provided between the electrode lead-out piece and the cover plate body.

[0017] Optionally, an insulating ring is sleeved on the outer wall of the pole column at a position corresponding to the cover plate body.

[0018] According to a second aspect of the present disclosure, a single cell is further provided. The single cell includes a housing and the above-mentioned cover plate assembly, and the cover plate assembly is installed at at least one end of the housing.

[0019] According to a third aspect of the present disclosure, a battery pack is further provided. The battery pack includes a tray and a plurality of the above-mentioned single cells, and the plurality of single cells are stacked in the tray.

[0020] According to a fourth aspect of the present disclosure, an electrical device is further provided. The electrical device includes the above-mentioned single cell, or, the above-mentioned battery pack.

[0021] Through the above technical solution, a protective layer is added on the surface of the insulating sheet to reduce the effect of laser on the insulating sheet when the cover plate body is welded to the battery housing. By utilizing the characteristics of the high-absorption or high-reflection material of the protective layer, most of the laser energy can be absorbed and / or reflected, reducing the absorption of laser by the insulating sheet, and effectively reducing the risks of deformation, burning, and reduction of the cell life caused by laser irradiation during welding.

[0022] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. Description of the Drawings

[0023] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. They are used together with the following specific implementation to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0024] Figure 1 is a schematic structural diagram of a cover plate assembly provided by an exemplary embodiment of the present disclosure;

[0025] Figure 2 is a schematic structural view of a single cell provided by an exemplary embodiment of the present disclosure;

[0026] Figure 3 is a disassembled view of a single cell provided by an exemplary embodiment of the present disclosure;

[0027] Figure 4 is a cross-sectional view of a single cell provided by an exemplary embodiment of the present disclosure;

[0028] Figure 5 is Figure 4 a partial enlarged view of A in

[0029] Description of Reference Numerals

[0030] 1 Electrode connecting piece 2 Cover plate body

[0031] 21 Groove 3 Electrode lead-out piece

[0032] 4 Terminal post 5 Insulating sheet

[0033] 6 Protective layer 7 Spacer

[0034] 8 Insulating ring 9 Outer shell Detailed Embodiment

[0035] The following will describe in detail the specific embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining and understanding the present disclosure, and are not used to limit the present disclosure.

[0036] In the present disclosure, unless otherwise stated, the orientation terms "upper", "lower", "top", and "bottom" are defined based on the actual use directions of the relevant components. "Inner" and "outer" refer to the contour of the corresponding components themselves. In the present disclosure, when the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0037] The position where the cover plate body 2 is connected to the outer shell 9 of the single cell is the weld seam where the two are welded. In the thickness direction of the single cell, the insulating sheet 5 is about 3 mm away from the weld seam. When the cover plate body 2 and the outer shell 9 are laser welded, the laser power is relatively large, and most of the outer shell 9 is made of aluminum alloy material, which has high reflectivity. Therefore, the laser used for welding and the reflected laser caused by the highly reflective material during welding are likely to cause the insulating sheet 5 to burn out.

[0038] Refer to Figures 1 to 5, the present disclosure provides a cover assembly, which may include electrode connection pieces 1 and a cover body 2 arranged side by side. Specifically, the material of the electrode connection pieces 1 can be selected from aluminum or copper, and the material of the cover body 2 can be selected from aluminum or steel. Among them, the cover body 2 is used to be welded to the end of the outer shell 9 of the single cell. An insulating sheet 5 is provided between the cover body 2 and the electrode connection pieces 1. In an embodiment of the present disclosure, the insulating sheet 5 can be made of an organic material such as polyphenylene sulfide. A protective layer 6 is provided on the outer peripheral wall of the insulating sheet 5, and the protective layer 6 is used to absorb and / or reflect the laser beam when the cover body 2 and the outer shell 9 are laser welded.

[0039] Through the above technical solution, a protective layer is added to the surface of the insulating sheet to reduce the effect of the laser on the insulating sheet when the cover body and the battery outer shell are welded. Utilizing the characteristics of the high-absorbing or high-reflecting material of the protective layer, most of the laser energy can be absorbed and / or reflected, reducing the absorption of the laser by the insulating sheet, and effectively reducing the risks of deformation, burning, and reduction of the cell life of the insulating sheet caused by laser irradiation during welding.

[0040] In an embodiment according to the present disclosure, the material of the protective layer 6 can be a metal. Specifically, the material of the protective layer 6 can be a high-reflecting material such as copper or aluminum, which has a low cost and a good reflection effect on the laser.

[0041] In an embodiment of the present disclosure, the protective layer 6 can be provided on the outer peripheral wall of the insulating sheet 5 by electroplating or spraying. The metal protective layer is processed by coating manufacturing processes such as electroplating or spraying, and the process is simple and convenient for manufacturing.

[0042] In some embodiments, referring to Figure 4 、 Figure 5 , the bottom end of the protective layer 6 and the bottom end of the insulating sheet 5 can be flush, and the top end of the protective layer 6 is lower than the top end of the insulating sheet 5. In an embodiment of the present disclosure, the top end of the protective layer 6 is slightly lower than the top end of the insulating sheet 5, so that a part of the side wall of the insulating sheet 5 can be exposed. Since the protective layer 6 can be made of a conductive metal material, such a setting can prevent the short circuit of the cell caused by adding the protective layer 6.

[0043] Among them, referring to Figure 5 , the distance t1 between the top end of the protective layer 6 and the top end of the insulating sheet 5 can satisfy: 0.5 mm ≤ t1 ≤ 1.5 mm, and specifically can be 0.6 mm, 0.8 mm, 1 mm, 1.2 mm. If t1 is too large, the protective layer 6 will be too short, affecting the reflection effect of the protective layer 6; if t1 is too small, the cell will be short-circuited. Therefore, designing a reasonable t1 size can not only protect the insulating sheet 5 from laser irradiation, but also avoid the short circuit of the cell.

[0044] Furthermore, referring to Figure 5, the thickness t2 of the protective layer 6 is ≤ 0.1 mm, and specifically can be 0.05 mm. The value of t2 can be designed according to the protection effect of the protective layer 6 required in practice. The present disclosure does not limit the specific values of t1 and t2, and they all fall within the protection scope of the present disclosure.

[0045] In another embodiment according to the present disclosure, the material of the protective layer 6 can be ceramic. Additionally, the protective layer 6 can also be other reflective or high-temperature resistant materials. When the protective layer 6 adopts a ceramic material, no short circuit will occur, and the top end of the protective layer 6 can be flush with the top end of the insulating sheet 5.

[0046] Furthermore, the protective layer 6 can be arranged on the side wall of the insulating sheet 5 by riveting. Riveting not only provides a firmer connection but also is not prone to loosening, ensuring the reliability of the connection. And, riveting connection does not require additional components such as bolts and nuts, so it can reduce the weight of the connection part, meeting the requirements of lightweight design. The process of riveting connection is very simple, and its operation is simple and fast, reducing the working intensity and production cost.

[0047] Specifically, referring to Figure 3 , Figure 4 , the insulating sheet 5 can be sleeved on the bottom wall and side wall of the electrode connection piece 1. Since the bottom wall and side wall of the electrode connection piece 1 are close to the weld where the cover body 2 is welded to the outer shell 9 of the single cell, such an arrangement can well protect the bottom wall and side wall of the electrode connection piece 1 from being irradiated by the laser, thereby reducing the risk of deformation and burning of the insulating sheet.

[0048] In some embodiments, referring to Figure 3 , a groove 21 for installing the insulating sheet 5 can be formed on the cover body 2. The groove 21 can limit the position of the insulating sheet 5. Placing the bottom of the insulating sheet 5 in the groove 21 can better protect the bottom of the insulating sheet 5 from being exposed, so as to avoid damage.

[0049] In some embodiments, referring to Figure 3 , an electrode lead-out piece 3 is provided at one end of the cover body 2 away from the electrode connection piece 1. The material of the electrode lead-out piece 3 can be selected from aluminum or copper. A pole column 4 is provided on the electrode lead-out piece 3, and the pole column 4 passes through the cover body 2 and the electrode connection piece 1 in sequence. Specifically, the pole column 4 can be welded or integrally formed on the electrode lead-out piece 3.

[0050] In some embodiments, referring to Figure 3 , Figure 4 , a spacer 7 can be provided between the electrode lead-out piece 3 and the cover body 2 for insulating the cover body 2 and the electrode lead-out piece 3. Specifically, the material of the spacer 7 can be an organic material such as polytetrafluoroethylene.

[0051] In some embodiments, referring to Figures 3 to 5, at a position on the outer wall of the terminal post 4 corresponding to the cover plate body 2, an insulating ring 8 can be sleeved for insulating the terminal post 4 and the cover plate body 2. The insulating ring 8 can be made of rubber, specifically EPDM (Ethylene Propylene Diene Monomer).

[0052] Referring to Figure 3 , Figure 4 , according to the second aspect of the present disclosure, a single cell is further provided. The single cell may include a housing 9 and the above-mentioned cover plate assembly, and the cover plate assembly is installed at at least one end of the housing 9. In the embodiments of the present disclosure, the single cell may include two cover plate assemblies, and the two cover plate assemblies are respectively assembled and welded to both ends of the housing 9. In other embodiments, the single cell may also include one cover plate assembly, and the cover plate assembly is installed at one end of the housing 9. The single cell has all the beneficial effects of the above-mentioned cover plate assembly, which will not be elaborated here.

[0053] According to the third aspect of the present disclosure, a battery pack is further provided. The battery pack may include a tray and a plurality of the above-mentioned single cells, and the plurality of single cells are stacked in the tray. The battery pack has all the beneficial effects of the above-mentioned single cell and the cover plate assembly, which will not be elaborated here.

[0054] According to the fourth aspect of the present disclosure, an electrical device is further provided. The electrical device may include the above-mentioned single cell or the above-mentioned battery pack. The electrical device has all the beneficial effects of the above-mentioned battery pack, single cell and cover plate assembly, which will not be elaborated here.

[0055] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0056] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0057] Furthermore, any combination can be made between various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A cover plate assembly, characterized in that: It comprises an electrode connecting piece and a cover body arranged in parallel, wherein the cover body is used to be welded to the end of the shell of the single cell, an insulating sheet is arranged between the cover body and the electrode connecting piece, and a protective layer is arranged on the outer peripheral wall of the insulating sheet, and the protective layer is used to absorb and / or reflect the laser beam when the cover body and the shell are laser welded.

2. The cover plate assembly according to claim 1, characterized in that: The material of the protective layer is metal.

3. The cover plate assembly according to claim 2, characterized in that: The protective layer is disposed on the outer peripheral wall of the insulating sheet by electroplating or spraying.

4. The cover plate assembly according to claim 1, characterized in that: The bottom end of the protective layer is flush with the bottom end of the insulating sheet, and the top end of the protective layer is lower than the top end of the insulating sheet.

5. The cover plate assembly according to claim 4, characterized in that: A distance t1 between the top of the protective layer and the top of the insulating sheet satisfies: 0.5 mm≤t1≤1.5 mm.

6. The cover plate assembly according to claim 1, characterized in that: The thickness of the protective layer t2≤0.1 mm.

7. The cover plate assembly according to claim 1, characterized in that: The material of the protective layer is ceramic.

8. The cover plate assembly according to claim 7, characterized in that: The protective layer is arranged on the side wall of the insulating sheet by riveting.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: The insulating sheet is sleeved on the bottom wall and the side wall of the electrode connecting sheet.

10. The cover plate assembly according to any one of claims 1 to 8, characterized in that: The cover plate body is formed with a groove for mounting the insulating sheet.

11. The cover plate assembly according to any one of claims 1 to 8, characterized in that: An electrode lead-out sheet is provided at one end of the cover body away from the electrode connecting sheet. A pole is provided on the electrode lead-out sheet. The pole passes through the cover body and the electrode connecting sheet in sequence.

12. The cover plate assembly according to claim 11, characterized in that: A spacer is arranged between the electrode lead-out sheet and the cover plate body.

13. The cover plate assembly according to claim 11, characterized in that: An insulating ring is sleeved on a position of the outer wall of the pole corresponding to the cover plate body.

14. A single cell battery, characterized in that: The single battery comprises a housing and a cap assembly according to any one of claims 1 to 13, wherein the cap assembly is mounted on at least one end of the housing.

15. A battery pack, characterized in that: The battery pack comprises a tray and a plurality of unit batteries according to claim 14, wherein the plurality of unit batteries are stacked in the tray.

16. An electrical equipment, characterized in that: The electrical equipment includes the single cell battery as claimed in claim 14, or the battery pack as claimed in claim 15.

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