CN-122000571-A - Battery cell, battery device and electricity utilization device

Abstract

The application provides a battery cell, a battery device and an electric device, wherein the battery cell comprises a shell, an electrode assembly, an end cover assembly and an adapter, the shell is enclosed to form a containing cavity with an opening, the electrode assembly is arranged in the containing cavity, the electrode assembly comprises a plurality of pole pieces with opposite polarities, each pole piece comprises a pole piece main body and pole lugs, the pole lugs of the pole pieces with the same polarity are stacked, the pole lugs are arranged in parallel with the pole piece main body, the end cover assembly covers the opening, the end cover assembly comprises a cover body and an electrode terminal arranged on the cover body, the adapter is arranged between the electrode assembly and the end cover assembly, the adapter comprises a first adapter part and a second adapter part which are arranged in an intersecting manner, and the first adapter part is electrically connected with the electrode terminal, and the second adapter part extends towards the containing cavity and is electrically connected with the pole lugs. The battery cell in the embodiment of the application can reduce the risk of tab breakage in the process of charging and discharging the battery cell, and improve the battery performance and the service life.

Inventors

• WU YUKUN
• ZHANG XIAOPING
• XU WENZHU
• CHEN ZHIPENG

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260508

Application Date

20241105

Claims (15)

1. 1. A battery cell, comprising: a housing enclosing a receiving cavity having an opening; the electrode assembly is arranged in the accommodating cavity and comprises a plurality of pole pieces with opposite polarities, each pole piece comprises a pole piece main body and pole lugs, the pole lugs of the pole pieces with the same polarity are stacked, and the pole lugs are arranged in parallel with the pole piece main bodies; The end cover assembly is covered on the opening and comprises a cover body and an electrode terminal arranged on the cover body; The switching piece is arranged between the electrode assembly and the end cover assembly, the switching piece comprises a first switching part and a second switching part which are arranged in an intersecting mode, the first switching part is electrically connected with the electrode terminal, and the second switching part extends towards the accommodating cavity and is electrically connected with the electrode lug.
2. 2. The battery cell according to claim 1, wherein a plurality of the pole pieces are stacked in a first direction, and the tab is provided at one side of the pole piece body in a second direction; The electrode assembly comprises a plurality of electrode lugs, a first switching part and a second switching part, wherein the electrode lugs are arranged in a furling mode along a first direction, the first switching part is arranged on the electrode lug side of the electrode assembly, the second switching part extends along a second direction and is overlapped with the electrode lugs, and the second direction is intersected with the first direction.
3. 3. The battery cell according to claim 2, wherein a side surface of the first transfer portion facing the electrode assembly abuts against an end surface of the tab in the second direction.
4. 4. The battery cell of claim 2, wherein in the second direction, the tab does not protrude from the pole piece body.
5. 5. The battery cell of any one of claims 2 to 4, wherein the electrode terminal comprises a first electrode terminal and a second electrode terminal, the pole piece comprises a plurality of first pole pieces and a plurality of second pole pieces of opposite polarity, and the tabs of the first pole pieces and the second pole pieces are arranged in parallel with the pole piece body; And in the paired transfer pieces, one transfer piece is connected with the first electrode terminal and the tab of the first pole piece, and the other transfer piece is connected with the second electrode terminal and the tab of the second pole piece.
6. 6. The battery cell of claim 5, wherein the first pole piece is provided with a first notch and the second pole piece is provided with a second notch; the projection of the first notch of the first pole piece along the first direction is at least partially overlapped with the tab of the second pole piece, and the projection of the second notch of the second pole piece along the first direction is at least partially overlapped with the tab of the first pole piece.
7. 7. The battery cell of claim 6, wherein the electrode assembly further comprises a separator disposed between the first and second electrode sheets in the first direction, the separator having a plurality of third notches, one of the third notches overlapping the first notch and the other of the third notches overlapping the second notch.
8. 8. The battery cell of claim 5, wherein the tab of the first pole piece is disposed at an angular position of the first pole piece and/or the tab of the second pole piece is disposed at an angular position of the second pole piece.
9. 9. The battery cell as recited in claim 5, wherein one end of the housing in the second direction is open, and the tab of the first pole piece and the tab of the second pole piece are on the same side of the electrode assembly in the second direction; or the two ends of the shell along the second direction are opened, and the tab of the first pole piece and the tab of the second pole piece are respectively positioned at two sides of the electrode assembly along the second direction.
10. 10. The battery cell of claim 5, wherein the tab of the first pole piece and the tab of the second pole piece are disposed on both sides of the electrode assembly in a third direction that intersects the first direction and the second direction.
11. 11. The battery cell according to any one of claims 1 to 10, wherein the cover body includes a first cover portion and a second cover portion, the electrode terminal is disposed in the second cover portion, and the second cover portion is disposed to sink toward the accommodation chamber with respect to the first cover portion.
12. 12. The battery cell of claim 11, wherein a surface of the electrode terminal facing away from the receiving cavity is flush with a surface of the first cover portion facing away from the receiving cavity.
13. 13. The battery cell as recited in claim 11, wherein the first and second cover portions have a height difference, and the pole piece body is provided with a protrusion that protrudes toward the cover and is adapted to a surface of the first cover portion that faces the receiving cavity.
14. 14. A battery device characterized by comprising a plurality of battery cells according to any one of claims 1 to 13.
15. 15. An electrical device comprising the battery device of claim 14.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery cell, a battery device and an electricity utilization device. Background Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles. In the conventional battery cell, after the electrode assembly is prepared, the tab needs to be folded to be electrically connected with the electrode terminal. However, after the tab is folded, stress exists at the folded position, and the acting force is transmitted to the folded position in the charging and discharging process of the battery, so that the tab is possibly broken, the capacity of the broken position cannot be exerted, and the capacity loss of the battery is caused. Disclosure of Invention In view of the above, the present application provides a battery cell, a battery device and an electric device, which can reduce the risk of tab breakage during the charge and discharge of the battery cell, and improve the performance and service life of the battery cell. In a first aspect, the application provides a battery cell, the battery cell includes a housing, an electrode assembly, an end cover assembly and an adapter, the housing encloses to form a containing cavity with an opening, the electrode assembly is arranged in the containing cavity, the electrode assembly includes a plurality of pole pieces with opposite polarities, the pole pieces include pole piece main bodies and pole lugs, the pole lugs of the pole pieces with the same polarity are stacked, the pole lugs are arranged in parallel with the pole piece main bodies, the end cover assembly covers the opening, the end cover assembly includes a cover body and an electrode terminal arranged on the cover body, the adapter is arranged between the electrode assembly and the end cover assembly, the adapter includes a first adapter and a second adapter which are arranged in an intersecting manner, the first adapter is electrically connected with the electrode terminal, and the second adapter extends towards the containing cavity and is electrically connected with the pole lugs. In the embodiment of the application, the adapter comprises the first adapter part and the second adapter part which are arranged in an intersecting way, and the electrode assembly and the electrode terminal can be electrically connected without turning over the tab, so that the risk of tab breakage in the process of charging and discharging the battery cell can be reduced, and the performance and the service life of the battery cell are improved. In some embodiments, the plurality of pole pieces are stacked along a first direction, and the tab is disposed on one side of the pole piece body along a second direction. The electrode assembly comprises a plurality of electrode lugs, a first switching part, a second switching part and a first electrode assembly, wherein the electrode lugs are arranged in a furling mode along a first direction, the first switching part is arranged on the electrode lug side of the electrode assembly, the second switching part extends along a second direction and is overlapped with the electrode lugs, and the second direction is intersected with the first direction. In some embodiments, in the second direction, the surface of one side of the first switching part facing the electrode assembly abuts against the end surface of the tab, so that the internal structure of the battery cell is more compact, the space occupied by the switching part and the electrode assembly in the second direction after being connected is saved, and the energy density of the battery is improved. In some embodiments, in the second direction, the tab does not protrude from the pole piece main body, so that the structure is more compact, after the end cover assembly is covered on the opening, the distance between the end cover assembly and the electrode assembly along the second direction is reduced, the internal space of the shell is more reasonably utilized, and the energy density of the battery cell is improved. In some embodiments, the electrode terminals include a first electrode terminal and a second electrode terminal, the pole piece includes a plurality of first pole pieces and a plurality of second pole pieces of opposite polarity, and the tabs of the first pole pieces and the second pole pieces are disposed parallel to the pole piece body. Among the paired adapters, one adapter is connected with the first electrode terminal and the tab of the first pole piece, and the other adapter is connected with the second electrod