Secondary battery, battery column, and apparatus
This application relates to a secondary battery, a battery column, and an apparatus. The secondary battery includes a top cover plate, having an outer surface and an inner surface disposed opposite each other in a thickness direction of the top cover plate and an electrode lead-out hole extending along the thickness direction; a pole, disposed in the electrode lead-out hole, where the pole includes a first metal layer and a second metal layer, and the first metal layer and the second metal layer are stacked along a direction from the inner surface to the outer surface; an insulation member, disposed between the top cover plate and the pole; and a first bonding layer, disposed between the insulation member and the first metal layer, where the insulation member is hermetically connected to the first metal layer through the first bonding layer.
1. A secondary battery, comprising:
a top cover plate, having an outer surface and an inner surface disposed opposite each other in a thickness direction of the top cover plate and an electrode lead-out hole extending along the thickness direction;
a pole, disposed in the electrode lead-out hole, wherein the pole comprises a first metal layer and a second metal layer, and the first metal layer and the second metal layer are stacked along a direction from the inner surface to the outer surface;
an insulation member, disposed between the top cover plate and the pole; and
a first bonding layer, disposed between the insulation member and the first metal layer, wherein the first metal layer and the first bonding layer are bonded by a chemical bond, the insulation member and the first bonding layer are bonded by a chemical bond, and the insulation member is hermetically connected to the first metal layer through the first bonding layer;
wherein the first metal layer has a first concave portion facing away from the second metal layer, part of the insulation member extends into the first concave portion, and the first bonding layer extends to between the first concave portion and the insulation member;
wherein the secondary battery further comprises a second bonding layer, the second bonding layer is disposed between the insulation member and the second metal layer, the second metal layer and the second bonding layer are bonded by a chemical bond, the insulation member and the second bonding layer are bonded by a chemical bond, and the insulation member is hermetically connected to the second metal layer through the second bonding layer;
the second metal layer has a second concave portion facing away from the first metal layer, part of the insulation member extends into the second concave portion, and the second bonding layer extends to between the second concave portion and the insulation member.
2. The secondary battery according to claim 1 , wherein there is only one annular first concave portion, or there are two or more first concave portions, and the two or more first concave portions are spaced apart along a circumferential direction of the pole.
3. The secondary battery according to claim 1 , wherein there is only one annular second concave portion, or there are two or more second concave portions, and the two or more second concave portions are spaced apart along the circumferential direction of the pole.
4. The secondary battery according to claim 1 , wherein
the first metal layer is a copper layer or a copper alloy layer, and the second metal layer is an aluminum layer or an aluminum alloy layer; and/or
the first bonding layer comprises a first oxide film and a triazine thiol derivative disposed on the first oxide film, and the second bonding layer comprises a second oxide film and a triazine thiol derivative disposed on the second oxide film.
5. The secondary battery according to claim 1 , wherein the second metal layer is directly connected to the insulation member, tensile strength between the first metal layer and the first bonding layer is greater than tensile strength between the second metal layer and the insulation member, and tensile strength between the insulation member and the first bonding layer is greater than the tensile strength between the second metal layer and the insulation member.
6. The secondary battery according to claim 1 , wherein the secondary battery further comprises a third bonding layer, the third bonding layer is disposed between the top cover plate and the insulation member, the top cover plate and the third bonding layer are bonded by a chemical bond, the insulation member and the third bonding layer are bonded by a chemical bond, and the insulation member is hermetically connected to the top cover plate through the third bonding layer.
7. The secondary battery according to claim 6 , wherein
the top cover plate is an aluminum layer or an aluminum alloy layer; the first bonding layer comprises the first oxide film and the triazine thiol derivative disposed on the first oxide film, and the third bonding layer comprises a third oxide film and a triazine thiol derivative disposed on the third oxide film.
8. The secondary battery according to claim 1 , wherein
a thickness of the first metal layer is greater than or equal to that of the second metal layer along an axial direction of the electrode lead-out hole.
9. The secondary battery according to claim 1 , wherein the insulation member comprises barium sulfate particles; and/or the insulation member comprises a fiber structure.
10. The secondary battery according to claim 1 , wherein at least part of an outer peripheral surface of the first metal layer is covered by the first bonding layer along the axial direction of the electrode lead-out hole.
11. A battery column, comprising the secondary battery according to claim 1 .
12. An apparatus using a secondary battery as a power source, comprising the secondary battery according to claim 1 .