电池单体、电池装置及用电装置

Abstract

本申请提供一种电池单体、电池装置及用电装置，电池单体包括外壳、电极端子、电极组件。外壳具有容纳腔。电极端子设置于外壳。电极组件设置于容纳腔内，电极组件包括极片，极片包括极片主体和从极片主体引出的极耳。极耳包括第一极耳区和第二极耳区，第一极耳区连接极片主体和第二极耳区之间，第二极耳区电连接电极端子，第一极耳设有通孔。本申请提供的电池单体，在第一极耳区设置通孔，一定程度上削弱第一极耳区的机械强度，从而使得第一极耳区更容易地发生弯曲和变形，能够通过横向弹性变形以承受横向振动产生的应力，提高电池单体的可靠性和稳定性。

Claims

1. A battery cell, characterized by, include: The outer shell has a receiving cavity; Electrode terminals are disposed on the housing; An electrode assembly is disposed within the receiving cavity. The electrode assembly includes an electrode plate, and the electrode plate includes an electrode plate body and an electrode tab extending from the electrode plate body. The electrode tab includes a first electrode tab region and a second electrode tab region. The first electrode tab region connects the electrode body and the second electrode tab region. The second electrode tab region is electrically connected to the electrode terminal. The first electrode tab region is provided with a through hole.

2. The battery cell according to claim 1, characterized in that, The electrode includes multiple tabs, and the second tab regions of the multiple tabs are welded to the electrode terminals to form a welded portion; The through holes are spaced apart from the welded parts.

3. The battery cell according to claim 1, characterized in that, The electrode assembly includes multiple stacked electrode sheets, and the second tab regions of the multiple electrode sheets are welded to the electrode terminals to form a welded portion; The through holes are spaced apart from the welded parts.

4. The battery cell according to claim 1, characterized in that, The through hole extends along the layout direction of the first electrode area and the second electrode area.

5. The battery cell according to claim 1, characterized in that, The first electrode area is provided with a plurality of through holes, which are spaced apart along the width direction, and the width direction is perpendicular to the extension direction of the electrode and the thickness direction of the electrode.

6. The battery cell according to claim 1, characterized in that, The first tab region includes a plurality of sub-parts, which are spaced apart along the width direction and form through holes between adjacent sub-parts. The width direction is perpendicular to the extension direction of the tab and the thickness direction of the tab.

7. The battery cell according to claim 1, characterized in that, The first electrode area includes a plurality of through-hole groups, each through-hole group including a plurality of through-holes arranged along the width direction, the width direction being perpendicular to the extension direction of the electrode and the thickness direction of the electrode; Multiple through-hole groups are arranged along the extension direction of the electrode tab.

8. The battery cell according to claim 7, characterized in that, Two adjacent through-hole groups are staggered along the width direction.

9. The battery cell according to claim 1, characterized in that, In the extending direction of the electrode tab, the size of the through hole and the size L1 of the electrode tab satisfy the following condition: 1mm≤L2≤0.8L1.

10. The battery cell according to claim 1, characterized in that, In the extending direction of the tab, the minimum distance L3 between the through hole and the electrode body satisfies: 0 < L3 < L1 - L2, where L1 is the size of the tab and L2 is the size of the through hole.

11. The battery cell according to claim 1, characterized in that, On a plane perpendicular to the thickness direction of the electrode tab, the area S2 of the through hole and the area S1 of the electrode tab satisfy: 0 < S2 < 0.6S1; and / or, In the width direction of the electrode tab, the size L4 of the through hole is 0.2 mm to 5 mm, and the width direction is perpendicular to the extension direction of the electrode tab and the thickness direction of the electrode tab.

12. The battery cell according to claim 1, characterized in that, The battery cell also includes a conductive layer, which is connected to the first tab region.

13. The battery cell according to claim 12, characterized in that, The conductive layer is attached to the outer surface of the first tab region, and the conductive layer has a slot, which is configured to expose the through hole.

14. The battery cell according to claim 12, characterized in that, A portion of the conductive layer is attached to the outer surface of the first tab region, and another portion is accommodated within the through hole.

15. The battery cell according to claim 12, characterized in that, In the extending direction of the tab, the size L2 of the through hole, the size L6 of the first tab region, and the size L5 of the conductive layer satisfy: L2≤L5<L6.

16. The battery cell according to claim 12, characterized in that, In the width direction of the tab, both ends of the conductive layer extend to the edge of the tab, and the width direction is perpendicular to the extension direction of the tab and the thickness direction of the tab.

17. The battery cell according to claim 12, characterized in that, The conductive layer is made of carbon-based conductive adhesive or polymer-based conductive adhesive.

18. A battery cell, characterized by include: The shell has openings at both ends; Two end caps, respectively, cover the opening; Two electrode terminals are respectively disposed on the two end caps; An electrode assembly is disposed within the housing. The electrode assembly includes an electrode plate, and the electrode plate includes an electrode plate body and electrode tabs extending from both ends of the electrode plate body. At least one of the electrode tabs includes a first electrode tab region and a second electrode tab region, the first electrode tab region is connected between the electrode body and the second electrode tab region, the second electrode tab region is electrically connected to the corresponding electrode terminal, and the first electrode tab is provided with a through hole.

19. A battery device characterized by comprising: It includes multiple battery cells according to any one of claims 1 to 18.

20. An electrical device, comprising: Includes a battery cell according to any one of claims 1 to 18 or a battery device according to claim 19, wherein the battery cell or the battery device is used to store or provide electrical energy.

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