CN-122029691-A - Battery cell, battery and electricity utilization device

Abstract

A battery unit (20), a battery (100) and an electric device, wherein the battery unit (20) comprises a shell (23), the shell (23) comprises a first wall (21), an electrode assembly (22) is provided with a lug, an electrode terminal (25) is arranged on the first wall (21), the electrode terminal (25) is used for being connected with a busbar (30) of the battery (100), an adapter piece (24) is used for being connected with the lug and the electrode terminal (25), the electrode terminal (25) is provided with a first molten pool area (40) and a second molten pool area (41), the first molten pool area (40) is used for being connected with the busbar (30), the second molten pool area (41) is connected with the adapter piece (24), and the first molten pool area (40) and the second molten pool area (41) are staggered in the direction perpendicular to the thickness direction of the first wall (21).

Inventors

• LIN DENGHUA
• CAO MENGKAI
• HUANG SHOUJUN
• ZHENG YULIAN
• WANG PENG
• JIN HAIZU

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260512

Application Date

20241211

Priority Date

20240205

Claims (17)

1. A battery cell, comprising: a housing provided with a receiving cavity, the housing comprising a first wall; The electrode assembly is arranged in the accommodating cavity and provided with a tab; An electrode terminal provided to the first wall, the electrode terminal being for connection with a bus bar of the battery; An adapter for connecting the tab and the electrode terminal; The electrode terminal is provided with a first molten pool area and a second molten pool area, the first molten pool area is used for being connected with the busbar, the second molten pool area is connected with the adapter, and the first molten pool area and the second molten pool area are staggered along the direction perpendicular to the direction of the first wall thickness.
2. The battery cell of claim 1, wherein the orthographic projection of the first molten pool zone and the orthographic projection of the second molten pool zone are completely staggered along the thickness direction of the first wall.
3. The battery cell according to claim 1, wherein the electrode terminal includes a first terminal body and a second terminal body stacked in a thickness direction of the first wall, the first terminal body being located on a side of the second terminal body remote from the accommodation chamber, a surface of the first terminal body having a first welding region corresponding to the first molten pool region, a surface of the second terminal body having a second welding region corresponding to the second molten pool region, the first welding region and the second welding region being staggered in a direction perpendicular to the first wall thickness direction; The first terminal body is provided with a first body section and a second body section which are connected, the first body section and the second body section are arranged along the direction perpendicular to the first wall thickness direction, the surface of the first body section is provided with a first welding area, and the thickness of the first body section is larger than that of the second body section along the first wall thickness direction.
4. The battery cell according to claim 3, wherein the second terminal body has a third body section and a fourth body section connected to each other, the third body section and the fourth body section being arranged in a direction perpendicular to the first wall thickness direction, a surface of the third body section being formed with the second welding region, and a thickness of the third body section being greater than a thickness of the fourth body section in the first wall thickness direction.
5. The battery cell of claim 4, wherein the fourth body segment has a thickness of 0.1mm or greater.
6. The battery cell according to any one of claims 3-5, wherein the second welding region is located at a middle position of the second terminal body in a direction perpendicular to the first wall thickness direction, and the first welding region is located outside the second welding region.
7. The battery cell of claim 6, wherein an orthographic projection of the first welding region is disposed about an orthographic projection of the second welding region along the first wall thickness direction.
8. The battery cell according to claim 6 or 7, wherein the second welding regions are configured in a linear type, the first welding regions are two, and the two first welding regions are located at opposite sides of the second welding region in a direction perpendicular to the first wall thickness direction.
9. The battery cell according to any one of claims 3-8, wherein the first welding region is located at a middle position of the first terminal body in a direction perpendicular to the first wall thickness direction, and the second welding region is located outside the first welding region.
10. The battery cell of claim 9, wherein an orthographic projection of the second welding region is disposed around an orthographic projection of the first welding region along the first wall thickness direction.
11. The battery cell of any of claims 3-10, wherein a surface of the first terminal body facing away from the second terminal body has the first weld region and a surface of the second terminal body facing away from the first terminal body has the second weld region.
12. The battery cell according to any one of claims 3-11, wherein a surface of the first terminal body facing the second terminal body has one of a recessed structure and a boss structure, and a surface of the second terminal body facing the first terminal body has the other of the recessed structure and the boss structure, the boss structure fitting within the recessed structure.
13. The battery cell of any of claims 3-12, wherein the first terminal body has a through-hole structure extending through the first terminal body in the first wall thickness direction.
14. The battery cell of any of claims 3-13, wherein the first terminal body and the second terminal body are of different materials.
15. The battery cell of claim 14, wherein the first terminal body is configured as an aluminum piece and the second terminal body is configured as a copper piece.
16. A battery comprising a plurality of the cells of any one of claims 1-15 and a buss bar for connecting the first melt pool areas of the plurality of cells.
17. An electrical device comprising the battery cell according to any one of claims 1-15 or the battery according to claim 14.

Description

Battery cell, battery and electricity utilization device Cross Reference to Related Applications The present application is based on the chinese patent application number 202420283218.1, with application date 2024, 02, 05, and claims priority from the chinese patent application, the entire contents of which are incorporated herein by reference. Technical Field The present application relates to the field of batteries, and in particular, to a battery cell, a battery, and an electric device. Background In the related art, one end of the electrode terminal is connected with the adapter plate, the opposite end of the electrode terminal is connected with the connecting plate, and the connection part of the electrode terminal and the adapter plate and the connection part of the electrode terminal and the connecting plate are opposite along the thickness direction of the electrode terminal, so that the connection quality of the electrode terminal, the adapter plate and the connecting plate is ensured, and the electrode terminal with large thickness is required to be used, however, the electrode terminal with large thickness has high production cost, and the electrode terminal with large thickness occupies the installation space, so that the capacitance of the battery cell is influenced. Content of the application The present application aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present application is to provide a battery cell, which has a small thickness of an electrode terminal, thereby being beneficial to reducing the production cost of the battery cell and improving the capacitance of the battery cell. In a first aspect, an embodiment of the present application provides a battery cell, including: A housing provided with a receiving cavity, the housing comprising a first wall; The electrode assembly is arranged in the accommodating cavity and provided with a tab; An electrode terminal provided at the first wall, the electrode terminal being for connection with a bus bar of the battery; The adapter is used for connecting the electrode lug and the electrode terminal; The electrode terminal is formed with a first molten pool area for connection with the busbar and a second molten pool area connected with the adapter, the first and second molten pool areas being staggered in a direction perpendicular to the first wall thickness direction. In the technical scheme, the first molten pool area and the second molten pool area are staggered along the direction perpendicular to the first wall thickness direction, so that the thickness of the electrode terminal can be reduced on the basis of not affecting the connection quality of the electrode terminal, the adapter and the bus bar, the production cost of the battery unit is reduced, the installation space required by the electrode terminal can be reduced by reducing the thickness of the electrode terminal, and the electric capacity of the battery unit is improved. In a second aspect, an embodiment of the present application further provides a battery, including a plurality of the foregoing battery cells and a bus bar, where the bus bar is used to connect the first molten pool areas of the plurality of battery cells. In a third aspect, an embodiment of the present application further provides an electrical apparatus, including the foregoing battery cell, or including the foregoing battery. Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. Drawings FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application; fig. 2 is an exploded view of a battery according to some embodiments of the present application; Fig. 3 is a schematic diagram illustrating connection between a battery cell and a bus bar according to some embodiments of the present application; FIG. 4 is an exploded view of a battery cell and a bus bar according to some embodiments of the present application; FIG. 5 is a schematic view illustrating another angular connection of a battery cell and a bus bar according to some embodiments of the present application; FIG. 6 is a cross-sectional view at C-C in FIG. 5; FIG. 7 is an enlarged schematic view at D in FIG. 6 (as one embodiment of the application); FIG. 8 is an enlarged schematic view at D in FIG. 6 (as another embodiment of the application); FIG. 9 is an enlarged schematic view at D in FIG. 6 (as yet another embodiment of the application); Fig. 10 is a schematic view of an electrode terminal according to some embodiments of the present application; Fig. 11 is an exploded view of an electrode terminal according to some embodiments of the present application. Reference numerals in the specification are as follows: vehicle 1000, battery 100, controller 200, motor 300; A case 10, a first ca