Battery, electric device, and method and device for preparing battery cell
Embodiments provide a battery, an electric device, and a method and a device for preparing battery cell, featuring a higher space utilization. The battery includes: a plurality of battery cells, where the plurality of battery cells are arranged in a first direction, a first region on an edge of a first surface of each of the plurality of battery cells is recessed to form a first recess, a first electrode terminal of each of the battery cells is protrusively provided on a second surface of the battery cell, the first surface and the second surface are perpendicular to the first direction, and the plurality of battery cells include a first battery cell and a second battery cell that are adjacent; and a first busbar configured to connect first electrode terminals of the adjacent first battery cell and second battery cell.
1. A battery, characterized by comprising:
a plurality of battery cells, wherein the plurality of battery cells are arranged in a first direction, a first region on an edge of a first surface of each of the plurality of battery cells is recessed to form a first recess, a first electrode terminal of each of the battery cells is protrusively provided on a second surface of the battery cell, the first surface and the second surface are perpendicular to the first direction, and the plurality of battery cells comprise a first battery cell and a second battery cell that are adjacent, wherein the first region is arranged in an area on the first surface opposite to first electrode terminal;
a first busbar, configured to connect a first electrode terminal of the first battery cell and a first electrode terminal of the second battery cell, wherein the first busbar comprises a first end, a second end, and a bending portion disposed between the first end and the second end, the bending portion is configured as bendable to allow the first busbar to bypass a side wall of the second battery cell parallel to the first direction, the first end of the first busbar is connected to the first electrode terminal of the first battery cell and the second end of the first busbar is connected to the first electrode terminal of the second battery cell, the first end of the first busbar and the first electrode terminal of the first battery cell are both accommodated in the first recess of the second battery cell;
wherein each one the plurality of battery cells comprises a housing and an end cover, wherein the housing is configured to accommodate an electrode assembly of the battery cell, the end cover closes the housing to enclose the electrode assembly in the housing, a bottom wall of the housing forms the first surface of the battery cell, the end cover forms the second surface of the battery cell, a region of the end cover corresponding to the electrode assembly is raised in a direction back away from the housing, so as to form a depression in a side of the end cover facing the housing, a welding track is formed between the edge of the housing and the edge of the end cover, a contour line is formed between the raised region of the end cover and the depression, and a distance between the contour line and the welding track is greater than 0.5 mm.
2. The battery according to claim 1 , characterized in that
a surface of the bending portion facing the second battery cell is provided with an insulation layer.
3. The battery according to claim 2 , characterized in that the insulation layer comprises an insulation patch or insulation coating.
4. The battery according to claim 1 , characterized in that in the first direction, size of the first recess is greater than a sum of height of the first electrode terminal and size of the first busbar.
5. The battery according to claim 1 , characterized in that in the first direction, a difference between size of the battery cell and the size of the first recess of the battery cell is greater than or equal to 2 mm.
6. The battery according to claim 1 , characterized in that in a second direction, size of the first recess on the first surface is greater than or equal to 12 mm, wherein the second direction is perpendicular to a third surface of the battery cell, and the third surface is perpendicular to the first surface and the second surface.
7. The battery according to claim 1 , characterized in that the depression is configured to limit a position of the electrode assembly during assembling of the electrode assembly.
8. The battery according to claim 1 , characterized in that depth of the depression is between 0.4 mm and 3 mm.
9. The battery according to claim 1 , characterized in that in a cross section of a plane perpendicular to the first direction, the depression is greater than or equal to the electrode assembly in size.
10. The battery according to claim 1 , characterized in that a second region on an edge of the first surface is recessed to form a second recess, the first region is located at a first end of the first surface in a second direction, the second region is located at a second end of the first surface in the second direction, a second electrode terminal of each of the battery cells is protrusively provided on the second surface of the battery cell, and the second electrode terminal and the first electrode terminal are opposite in polarity,
wherein the plurality of battery cells further comprises a third battery cell adjacent to the second battery cell; and the battery further comprises:
a second busbar, configured to connect a second electrode terminal of the second battery cell and a second electrode terminal of the third battery cell, wherein the second busbar comprises a first end, a second end, and a bending portion disposed between the first end and the second end, the bending portion is configured as bendable to allow the second busbar to bypass a side wall of the third battery cell parallel to the first direction, so that the first end of the second busbar is connected to the second electrode terminal of the second battery cell and the second end of the second busbar is connected to the second electrode terminal of the third battery cell, wherein the first end of the second busbar and the second electrode terminal of the second battery cell are both accommodated in the second recess of the third battery cell.
11. An electric device, characterized by comprising the battery according to claim 1 , wherein the battery is configured to supply electrical energy.
12. The battery according to claim 1 , wherein the bending portion is wrapped with an insulating material.
13. The battery according to claim 10 , wherein the bending portion of the second busbar further comprises a first bending region, a second bending region, and an intermediate region, wherein the first bending region is configured for bending to connect the first end and the intermediate region, and the second bending region is configured for bending to connect the second end and the intermediate region, the intermediate region comprises a plurality of stiffeners parallel to the first direction.
14. The battery according to claim 1 , wherein the bending portion of the first busbar further comprises a first bending region, a second bending region, and an intermediate region, wherein the first bending region is configured for bending to connect the first end and the intermediate region, and the second bending region is configured for bending to connect the second end and the intermediate region, the intermediate region comprises a plurality of stiffeners parallel to the first direction.
15. The battery according to claim 14 , wherein a thickness of the first bending region and a thickness of the second bending region are less than a thickness of the intermediate region.
16. The battery according to claim 14 , wherein the intermediate region is perpendicular to the first surface and the second surface.