电池单体、电池装置及用电装置

Abstract

本申请提供了一种电池单体、电池装置及用电装置，该电池单体中的电极组件包括电极主体和极耳，极耳连接于电极端子；第一绝缘件连接于壁部，第一绝缘件的至少部分设置在壁部与电极主体之间；第二绝缘件形成具有第一开口的第一容腔，电极主体位于第一容腔，第一开口朝向壁部设置，第一开口的边缘固定连接于第一绝缘件的外周面形成连接区域；隔热件连接于位于电极主体外侧的隔离件，隔热件位于隔离件和第二绝缘件之间。由于电极主体外侧的隔离件上连接有隔热件，隔热件位于隔离件和第二绝缘件之间，使得在将第二绝缘件与第一绝缘件通过热熔工艺连接时，热量能够被隔热件阻挡，不易向隔离件传递，减小了隔离件受损可能，提高了电池单体的可靠性。

Claims

1. A battery cell, characterized by, include: The outer casing, including the walls; Electrode terminals are disposed on the wall portion; An electrode assembly is housed in the housing. The electrode assembly includes an electrode body and tabs, the tabs being connected to the electrode terminals. The electrode assembly includes a spacer, a portion of which is disposed on the outside of the electrode body. A first insulating member is connected to the wall portion, and at least a portion of the first insulating member is disposed between the wall portion and the electrode body; A second insulating member is housed in the outer casing. The second insulating member forms a first cavity with a first opening. The electrode body is located in the first cavity. The first opening is disposed facing the wall. The edge of the first opening is fixedly connected to the outer peripheral surface of the first insulating member to form a connection area. A heat insulation element is connected to the isolation element located outside the electrode body. The heat insulation element is located between the isolation element and the second insulating element, and the connection area is located on the side of the heat insulation element near the wall portion.

2. The battery cell of claim 1, wherein, Along the direction from the electrode body to the wall, the heat insulation element protrudes from the end of the electrode body facing the wall.

3. The battery cell of claim 2, wherein, Along the direction from the electrode body to the wall, the thermal insulation protrudes from the electrode body by a dimension E, where 0.8mm≤E≤3mm.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The spacer is wound up, and the spacer has a winding start end and a winding end end that are arranged opposite to each other along the winding direction; The heat insulation element is attached to the insulating element and covers the wound end of the insulating element.

5. The battery cell of any one of claims 1-4, wherein, Along the direction from the electrode body to the wall, the edge of the first opening is positioned opposite to the wall.

6. The battery cell of claim 5, wherein, Along the direction from the electrode body to the wall, the distance between the edge of the first opening and the wall is L, where 1mm≤L≤2mm.

7. The battery cell of any one of claims 1-6, wherein, The first insulating member includes a main body portion and a connecting portion that are connected to each other. The main body portion is connected to the side of the wall portion facing the electrode body, and the connecting portion protrudes from the main body portion toward the electrode body. The edge of the first opening is fixedly connected to the connecting portion to form the connecting area.

8. The battery cell of any one of claims 1-7, wherein, The electrode assembly is provided with at least two, and the at least two electrode assemblies are stacked along a first direction and located in the first cavity. The electrode body includes two bent areas arranged opposite each other along a second direction and a straight area connected between the two bent areas. The first direction and the second direction are perpendicular to each other. The heat insulation member is disposed on the outside of the at least two electrode assemblies and is fixedly connected to the straight area at the end of the at least two electrode assemblies in the first direction.

9. The battery cell of claim 8, wherein, The second insulating member includes two first walls disposed opposite each other along the first direction and two second walls disposed opposite each other along the second direction. The second walls are connected between the two first walls. The area of ​​the first walls is larger than the area of ​​the second walls. The first walls are fixedly connected to the first insulating member to form a first connection area, and the second walls are fixedly connected to the first insulating member to form a second connection area.

10. The battery cell of claim 9, wherein, The first connection area is provided in multiple ways, and the multiple first connection areas are arranged at intervals.

11. The battery cell of claim 10, wherein, The number of heat insulation components is equal to the number of the first connection areas, and multiple heat insulation components are spaced apart. In the direction from which the electrode body points to the wall, the first connection area and the heat insulation component are correspondingly arranged. Along the first direction, the projection of each heat insulation component protrudes beyond the projection of the corresponding first connection area at both ends in the second direction.

12. The battery cell of claim 10, wherein, Along the first direction, the end of the thermal insulation component projected in the second direction protrudes by a length H corresponding to the projection of the first connection area, where 1mm≤H≤3mm.

13. The battery cell according to any one of claims 1-12, characterized in that, Along the direction from the electrode body to the wall, the length of the portion of the heat insulation member connected to the electrode body is G, and the length of the electrode body is I, where 0.5 ≤ G / I ≤ 1.

14. A battery device characterized by comprising: Includes the battery cell as described in any one of claims 1-13.

15. An electrical device, comprising: Includes the battery device as described in claim 14, the battery device being used to provide electrical energy.

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