Battery tab location design and method of construction
View Patent ↗A compact, robust, multifunctional and highly manufacturable rechargeable cylindrical electrochemical cell is provided. In some embodiments, a cell can include a spirally wound assembly having an anode sheet and a cathode sheet separated by separator membranes, each sheet having a electroactive layer on a current collector. At least one of the current collectors can be in electrical communication with conducting tabs that extend from at least one of the anode sheet and the cathode sheet, the conducting tabs extends from an end face of the spirally wound assembly. The centers of the plurality of conducting tabs can be located within a 90 degree quadrant of an end face of the spirally wound assembly.
1. A cylindrical electrochemical cell, comprising:
a spirally wound assembly comprising an anode sheet and a cathode sheet separated by separator membranes, the cathode sheet comprising a first electroactive layer on a first current collector, and the anode sheet comprising a second electroactive layer on a second current collector, the spirally wound assembly having a cylindrical side wall and opposing end faces,
wherein at least one of the first current collector and the second current collector is in electrical communication with a plurality of conducting tabs that extend from at least one of the anode sheet and the cathode sheet, the plurality of conducting tabs extending from an end face of the spirally wound assembly; and
wherein centers of the plurality of conducting tabs are spaced from each other in an annular direction around a center of the end face of the spirally wound assembly such that each of the plurality of conducting tabs are positioned within a 90 degree arc window.
2. The cylindrical electrochemical cell of claim 1 , wherein the first current collector is in electrical communication with a first plurality of conducting tabs that extend from the cathode sheet, and the second current collector is in electrical communication with a second plurality of conducting tabs that extend from the anode sheet, wherein the first plurality of conducting tabs and the second plurality of conducting tabs extend from opposing end faces of the spirally wound assembly.
3. The cylindrical electrochemical cell of claim 1 , wherein the plurality of conducting tabs are uniformly spaced along a length of at least one of the anode sheet and the cathode sheet.
4. The cylindrical electrochemical cell of claim 3 , wherein the plurality of conducting tabs are located beyond a distance from leading edges of at least one of the anode sheet and the cathode sheet.
5. The cylindrical electrochemical cell of claim 1 , wherein the plurality of conducting tabs comprise 4 to 12 tabs.
6. The cylindrical electrochemical cell of claim 1 , wherein the first current collector is in electrical communication with a first plurality of 4 to 12 conducting tabs that extend from the cathode sheet, and the second current collector is in electrical communication with a second plurality of 4 to 12 conducting tabs that extend from the anode sheet.
7. The cylindrical electrochemical cell of claim 6 , wherein the plurality of conducting tabs are uniformly spaced along a length of the at least one of the anode sheet and the cathode sheet.
8. The cylindrical electrochemical cell of claim 1 , wherein the locations of the plurality of conducting tabs are selected such that net magnetic fields caused by induced currents in the cylindrical electrochemical cell is reduce by at least 80% compared to having only a single conducting tab located at a leading edge of the at least one of the anode sheet and the cathode sheet.
9. The cylindrical electrochemical cell of claim 1 , wherein the plurality of conducting tabs are folded towards the center of the end face and intersect at a central axis.
10. The cylindrical electrochemical cell of claim 1 , wherein the plurality of conducting tabs are of different lengths.
11. The cylindrical electrochemical cell of claim 10 , wherein the lengths of the tabs are selected so that the ends of the tabs are aligned in a folded configuration.
12. The cylindrical electrochemical cell of claim 1 , wherein the cylindrical electrochemical cell comprises 1 tab per 50 cm 2 to 400 cm 2 area of anode and cathode sheet.
13. The cylindrical electrochemical cell of claim 1 , wherein the plurality of conducting tabs are secured to a connecting strap.
14. The cylindrical electrochemical cell of claim 13 , wherein the connecting strap is electrically connected to a terminal of a case housing the spirally wound electrochemical assembly.
15. A cylindrical electrochemical cell, comprising:
a spirally wound assembly comprising an anode sheet and a cathode sheet separated by separator membranes, the cathode sheet comprising a first electroactive layer on a first current collector, and the anode sheet comprising a second electroactive layer on a second current collector, the spirally wound assembly having a cylindrical side wall and opposing end faces,
wherein at least one of the first current collector and the second current collector is in electrical communication with a plurality of 4 to 12 conducting tabs that extend from at least one of the anode sheet and the cathode sheet at an end face of the spirally wound assembly, and wherein centers of the plurality of conducting tabs are spaced from each other in an annular direction around a center of the end face of the spirally wound assembly such that each of the plurality of conducting tabs are positioned in a 90 degree arc window.
16. The cylindrical electrochemical cell of claim 15 , wherein the first current collector is in electrical communication with a first plurality of 4 to 12 conducting tabs that extend from the cathode sheet, and the second current collector is in electrical communication with a second plurality of 4 to 12 conducting tabs that extend from the anode sheet, wherein the first plurality of conducting tabs and the second plurality of conducting tabs extend from opposing end faces of the spirally wound assembly.
17. The cylindrical electrochemical cell of claim 15 , wherein the plurality of conducting tabs are uniformly spaced along a length of at least one of the anode sheet and the cathode sheet.
18. The cylindrical electrochemical cell of claim 17 , wherein the plurality of conducting tabs are located beyond a distance from leading edges of at least one of the anode sheet and the cathode sheet.
19. The cylindrical electrochemical cell of claim 15 , wherein the locations of the plurality of conducting tabs are selected such that net magnetic fields caused by induced currents in the cylindrical electrochemical cell is reduce by at least 80% compared to having only a single conducting tab located at a leading edge of the at least one of the anode sheet and the cathode sheet.
20. The cylindrical electrochemical cell of claim 15 , wherein the plurality of conducting tabs are folded towards the center of the end face and intersect at a central axis.
21. The cylindrical electrochemical cell of claim 15 , wherein the plurality of conducting tabs are of different lengths.
22. The cylindrical electrochemical cell of claim 21 , wherein the lengths of the tabs are selected so that the ends of the tabs are aligned in a folded configuration.
23. The cylindrical electrochemical cell of claim 15 , wherein the cylindrical electrochemical cell comprises 1 tab per 50 cm 2 to 400 cm 2 area of anode and cathode sheet.
24. The cylindrical electrochemical cell of claim 15 , wherein the plurality of conducting tabs are secured to a connecting strap.
25. The cylindrical electrochemical cell of claim 24 , wherein the connecting strap is electrically connected to a terminal of a case housing the spirally wound electrochemical assembly.
26. A cylindrical electrochemical cell, comprising:
a spirally wound assembly comprising an anode sheet and a cathode sheet separated by separator membranes, the cathode sheet comprising a first electroactive layer on a first current collector, and the anode sheet comprising a second electroactive layer on a second current collector, the spirally wound assembly having a cylindrical side wall and opposing end faces,
wherein at least one of the first current collector and the second current collector is in electrical communication with a plurality of conducting tabs that extend from at least one of the anode sheet and the cathode sheet, the plurality of conducting tabs extends from an end face of the spirally wound assembly and wherein centers of the plurality of conducting tabs are spaced from each other in an annular direction around a center of the end face of the spirally wound assembly such that each of the plurality of conducting tabs are positioned within a 90 degree arc window; and
wherein the locations of the plurality of conducting tabs are selected such that net magnetic fields caused by induced currents in the cylindrical electrochemical cell is reduce by at least 80% compared to having only a single conducting tab located at a leading edge of the at least one of the anode sheet and the cathode sheet.