电池单体、电池装置、用电装置及储能装置

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By setting film layers and recognition layers with different active material capacities per unit area in the winding structure of the battery cell, the problem of low CB value in the bending area of the battery cell is solved, and the reliability and stability of the battery cell are improved.

CN224519922UActive Publication Date: 2026-07-17CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date: 2026-05-06
Publication Date: 2026-07-17

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively improve the CB value of the bending region of battery cells, leading to frequent lithium plating and affecting the reliability of battery cells.

Method used

The electrode assembly with a wound structure ensures that the film layer is accurately located in the bending region by setting film layers and recognition layers with different active material capacities per unit area in different regions of the current collector, thereby optimizing the distribution of active material capacity and reducing the risk of lithium plating in the bending region.

Benefits of technology

It improves the reliability and stability of individual battery cells, reduces the occurrence of lithium plating, and enhances the mechanical strength and material utilization of electrode components.

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Abstract

本申请提供一种电池单体、电池装置、用电装置及储能装置。电池单体包括构成为卷绕结构的电极组件。卷绕结构包括平直区和弯折区。电极组件包括极片。极片包括集流体、膜层和识别层。集流体包括位于平直区的平直部和位于弯折区的弯折部。沿集流体的厚度方向，膜层设置于集流体的至少一侧。膜层包括第一膜层和第二膜层，第一膜层至少设置于平直部。第二膜层设置于弯折部。第一膜层的单位面积活性物质容量与第二膜层的单位面积的活性物质容量不同。识别层设置于弯折部。沿集流体的厚度方向投影，识别层的投影至少部分位于膜层的投影范围外。本申请能够通过识别识别层的位置，对极片进行卷绕时，使得第二膜层更好地位于弯折部，提高电池单体的可靠性。

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Claims

1. A battery cell, characterized in that, The battery cell includes an electrode assembly configured as a wound structure, the wound structure including a straight region and a bent region, the electrode assembly including an electrode sheet, the electrode sheet including: The current collector includes a straight portion located in the straight area and a bent portion located in the bent area; A membrane layer, disposed on at least one side of the current collector along its thickness direction, comprising a first membrane layer and a second membrane layer, wherein the first membrane layer is disposed at least in the straight portion, and the second membrane layer is disposed in the bent portion, and the active material capacity per unit area of the first membrane layer is different from the active material capacity per unit area of the second membrane layer; and An identification layer is provided at the bend. Wherein, when projected along the thickness direction of the current collector, the projection of the identification layer is at least partially located outside the projection range of the film layer.

2. The battery cell according to claim 1, characterized in that, Along the first direction, the length of the recognition layer outside the projection range of the film layer is greater than or equal to 0.5 mm; Wherein, the first direction is perpendicular to both the thickness direction of the straight portion and the extension direction of the straight portion.

3. The battery cell according to claim 1, characterized in that, Along the first direction, the current collector includes a main body and an electrode portion connected to each other, the membrane layer is disposed on the main body, and the recognition layer is at least partially disposed on the electrode portion; Wherein, the first direction is perpendicular to both the thickness direction of the straight portion and the extension direction of the straight portion.

4. The battery cell according to claim 3, characterized in that, The identification layer is also disposed on the main body portion. The identification layer disposed on the main body portion is located between the main body portion and the second film layer, and extends from one side of the main body portion to the other side along the first direction.

5. The battery cell according to claim 3, characterized in that, The electrode also includes an insulating member, which is disposed on the side of the electrode tab facing the main body. Projecting along the thickness direction of the current collector, the projection of the insulating element overlaps with the projection of the electrode tab. The identification layer disposed on the tab is located between the insulating member and the tab.

6. The battery cell according to claim 5, characterized in that, The color of the identification layer is different from the color of the insulating component.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The electrode includes a positive electrode, the current collector includes a positive current collector, the first film layer includes a first positive film layer, the second film layer includes a second positive film layer, the first positive film layer is disposed at least in the straight portion of the positive current collector, the second positive film layer is disposed in the bent portion of the positive current collector, and the active material capacity per unit area of the first positive film layer is greater than the active material capacity per unit area of the second positive film layer.

8. The battery cell according to claim 7, characterized in that, Along the thickness direction of the positive current collector, the thickness of the first positive electrode film is greater than the thickness of the second positive electrode film.

9. The battery cell according to claim 7, characterized in that, Along the thickness direction of the current collector, the thickness of the identification layer is 10%-50% of the thickness of the first positive electrode film layer.

10. The battery cell according to claim 7, characterized in that, The second positive electrode film layer is disposed at least inside the positive electrode current collector, and the identification layer is disposed inside the bend of the positive electrode current collector.

11. The battery cell according to any one of claims 1 to 6, characterized in that, The electrode includes a negative electrode, the current collector includes a negative current collector, the first film layer includes a first negative film layer, the second film layer includes a second negative film layer, the first negative film layer is disposed at least in the straight portion of the negative current collector, the second negative film layer is disposed in the bent portion of the negative current collector, and the active material capacity per unit area of the first negative film layer is less than the active material capacity per unit area of the second negative film layer.

12. The battery cell according to claim 11, characterized in that, Along the thickness direction of the negative electrode current collector, the thickness of the first negative electrode film layer is less than the thickness of the second negative electrode film layer.

13. The battery cell according to claim 11, characterized in that, The second negative electrode film layer is disposed at least on the outside of the negative electrode current collector, and the identification layer is disposed on the outside of the bent portion.

14. The battery cell according to claim 1, characterized in that, Along the extending direction of the straight portion, the width of the identification layer is 2mm-20mm.

15. The battery cell according to claim 1, characterized in that, The recognition layer is made of a conductive material that is electrochemically inert.

16. A battery device characterized by comprising: The battery device includes: Box; The battery cell according to any one of claims 1 to 15, wherein the battery cell is disposed in the housing.

17. An electrical device, comprising: The electrical device includes a battery cell as described in any one of claims 1 to 15 or a battery device as described in claim 16 for providing electrical energy.

18. An energy storage device, characterized by The energy storage device includes a battery cell as described in any one of claims 1 to 15 or a battery device as described in claim 16 for storing or providing electrical energy.