Patterned crimp for battery collector attachment
A battery module includes an electrochemical cell. The electrochemical cell includes a jelly roll having an anode sheet, a cathode sheet, and a separator rolled together to form the jelly roll. Further, the electrochemical cell includes a current collector. The current collector includes a patterned crimp impression therein that extends into and fixes the current collector to an end of the jelly roll.
1. A battery module, comprising:
an electrochemical cell;
a jelly roll of the electrochemical cell including an anode sheet, a cathode sheet, and a separator rolled together to form the jelly roll; and
a current collector having a first leg and a second leg that are disposed around a longitudinal axis of the current collector, wherein the first leg and the second leg are joined together by an edge extending parallel to the longitudinal axis of the current collector, and wherein the current collector comprises a patterned crimp impression that extends into and fixes the current collector to an end of the jelly roll.
2. The battery module of claim 1 , wherein the patterned crimp impression comprises parallel ridge impressions.
3. The battery module of claim 2 , wherein the parallel ridge impressions comprise flat floors or pointed edges.
4. The battery module of claim 1 , wherein the patterned crimp impression comprises conical impressions.
5. The battery module of claim 4 , wherein the conical impressions comprise frustroconical impressions or pointed tips.
6. The battery module of claim 1 , wherein the patterned crimp impression comprises a first impression on the first leg of the current collector and a second impression on the second leg of the current collector opposite to the first side, wherein the second impression is offset from the first impression along the longitudinal axis of the current collector.
7. The battery module of claim 1 , wherein the current collector comprises a terminal fixed thereto.
8. The battery module of claim 7 , wherein the terminal is welded to the current collector.
9. The battery module of claim 1 , wherein the current collector is not welded to the jelly roll.
10. The battery module of claim 1 , wherein the current collector comprises a poka-yoke design configured to facilitate identification of the current collector as a positive current collector or a negative current collector.
11. The battery module of claim 1 , wherein the end of the jelly roll is pinched together at a weld point, and the current collector is fixed to the end of the jelly roll proximate to the weld point.
12. An electrochemical cell, comprising:
anode material, cathode material, and a separator rolled together to form a jelly roll; and
a current collector fixed to an end of the jelly roll via a patterned crimp impression on the current collector, wherein the current collector is not welded to the jelly roll.
13. The electrochemical cell of claim 12 , wherein the current collector comprises a terminal attached thereto.
14. The electrochemical cell of claim 12 , wherein the end of the jelly roll comprises a weld configured to define a region which receives the current collector.
15. The electrochemical cell of claim 12 , wherein the patterned crimp impression comprises parallel ridge impressions, conical impressions, or mesh lines.
16. The electrochemical cell of claim 12 , wherein the patterned crimp impression comprises at least one flat floor.
17. The electrochemical cell of claim 12 , wherein the patterned crimp impression comprises at least one edge or at least one tip.
18. A system, comprising:
an electrochemical cell having a jelly roll and a current collector, wherein the current collector comprises a first leg disposed on a first side of an end of the jelly roll and a second leg disposed on a second side of the end of the jelly roll; and
a crimp press comprising a first die having a first crimp pattern and a second die having a second crimp pattern, wherein the crimp press is configured to press the first crimp pattern of the first die into the first leg such that the first leg is moved toward the end of the jelly roll and the second leg, and to press the second crimp pattern of the second die into the second leg such that the second leg is moved toward the end of the jelly roll and the first leg, in order to crimp the current collector onto the end of the jelly roll.
19. The system of claim 18 , wherein the system does not comprise a welded connection between the current collector and the end of the jelly roll.
20. The system of claim 18 , wherein the first patterned impression is offset along a longitudinal axis of the current collector from the second patterned impression.
21. The system of claim 18 , wherein the first patterned impression is aligned along a longitudinal axis of the current collector with the second patterned impression.
22. The system of claim 18 , wherein at least the first patterned impression comprises ridges or conical extensions extending from a lateral surface of the first die.