Wound cell and battery using the same
An impact resistant wound cell comprises a first electrode plate with a first surface and a second surface. The first surface comprises a first active material area and a first current collector area, the second surface comprises a second active material area and a second current collector area. The first current collector area is located on an inner side of an outermost circle of the wound cell. In the first electrode plate, the second current collector area and the first current collector area are adjacent to and opposite to each other, the first current collector area and the second current collector area are bonded together by a first bonding member. The present disclosure further provides a battery using the wound cell.
1. A wound cell comprising:
a first electrode plate, a first separator, a second electrode plate and a second separator that are stacked in that order and wound together;
wherein the first electrode plate comprises a first current collector and a first active material partially coated on both surfaces of the first current collector;
wherein a first surface of the first electrode plate is provided with a first active material area coated with the first active material and a first current collector area without coating of the first active material, and the first current collector area being located on an inner side of an outermost layer of the wound cell;
wherein a second surface of the first electrode plate is provided with a second active material area coated with the first active material and a second current collector area without coating of the first active material; and
wherein, when the first electrode plate is wound, the second current collector area and the first current collector area are adjacent to and opposite to each other, and the first current collector area and the second current collector area are bonded together by a first bonding member.
2. The wound cell of claim 1 , wherein the first current collector area and the second current collector area are directly bonded together by the first bonding member.
3. The wound cell of claim 1 , wherein when the first electrode plate is wound, the first current collector area and the second current collector area are separated by the first separator and/or the second separator, and the first current collector area, the second current collector area and the separator(s) are bonded together by the first bonding member.
4. The wound cell of claim 1 , wherein in a winding direction of the wound cell, the first bonding member covers at least 50% of a length of each of the first current collector area and the second current collector area.
5. The wound cell of claim 1 , wherein the first bonding member completely covers the first current collector area and the second current collector area.
6. The wound cell of claim 1 , wherein the first bonding member comprises a plurality of portions spaced away from each other on each of the first current collector area and the second current collector area.
7. The wound cell of claim 1 , wherein the first bonding member is coupled to the first active material area.
8. The wound cell of claim 1 , wherein the first bonding member is an adhesive layer or an adhesive tape.
9. The wound cell of claim 1 , wherein a length of the wound cell is L3, and a length of the first bonding member in a length direction of the wound cell is 0.5×L3 to L3.
10. The wound cell of claim 1 , wherein a thickness of the first bonding member is 5 μm to 200 μm.
11. A battery comprising:
a packaging shell; and
a wound cell arranged in the packaging shell and comprising a first electrode plate, a first separator, a second electrode plate and a second separator that are stacked in that order and wound together;
wherein the first electrode plate comprises a first current collector and a first active material partially coated on both surfaces of the first current collector;
wherein a first surface of the first electrode plate is provided with a first active material area coated with the first active material and a first current collector area without coating of the first active material, and the first current collector area being located on an inner side of an outermost layer of the wound cell;
wherein a second surface of the first electrode plate is provided with a second active material area coated with the first active material, a second current collector area without coating of the first active material, and a third current collector area connected to the first current collector area, the third current collector area being located on an outer side of the outermost layer of the wound cell; and
wherein, when the first electrode plate is wound, the second current collector area and the first current collector area are adjacent to and opposite to each other, the first current collector area and the second current collector area are bonded together by a first bonding member, and the third current collector area and the packaging shell are bonded together by a second bonding member.
12. The battery of claim 11 , wherein the second bonding member partially or completely covers the third current collector area.
13. The battery of claim 11 , wherein the second bonding member is connected to the first bonding member, a length of the wound cell in a winding direction of the wound cell is L1, a total length of the third current collector area and the second current collector area in the winding direction is L2, a total length of the second bonding member and the first bonding member in the winding direction is (L1+5) to (L2+5).
14. The battery of claim 11 , wherein a length of the wound cell is L3, a length of the second bonding member in a length direction of the wound cell is 0.5×L3 to L3, a thickness of the second bonding member is 5 μm to 200 μm.
15. The battery of claim 11 , wherein the first current collector area and the second current collector area are directly bonded together by the first bonding member.
16. The battery of claim 11 , wherein when the first electrode plate is wound, the first current collector area and the second current collector area are separated by the first separator and/or the second separator, and the first current collector area, the separator(s), and the second current collector area are bonded together by the first bonding member.
17. The battery of claim 11 , wherein in a winding direction of the wound cell, the first bonding member covers at least 50% of a length of each of the first current collector area and the second current collector area.
18. The battery of claim 11 , wherein the first bonding member completely covers the first current collector area and the second current collector area.
19. The battery of claim 11 , wherein the first bonding member comprises a plurality of portions spaced away from each other on each of the first current collector area and the second current collector area.
20. The battery of claim 11 , wherein the first bonding member is coupled to the first active material area.