Current collector, manufacturing method and equipment thereof, and current collector preform

1 . A current collector, comprising:

a porous foam metal part, the porous foam metal part comprises a first edge and a second edge oppositely distributed in a first direction, and the first direction is perpendicular to a thickness direction of the current collector and of the porous foam metal part; and

at least one solid metal part, wherein the at least one solid metal part is connected to the first edge and/or the second edge,

wherein the porous foam metal part, including the first edge and/or the second edge to which the at least one solid metal part is connected, is uncompressed,

wherein the at least one solid metal part has a first metal segment; and in the first direction, a thickness of the first metal segment gradually decreases from an end thereof close to the porous foam metal part to an end thereof away from the porous foam metal part; optionally a surface of the first metal segment distributed in the thickness direction of the current collector is an arc-shaped surface, and in the thickness direction of the current collector, the arc-shaped surface bends toward a thickness center of the current collector; and/or the solid metal part has a second metal segment; in the first direction, the second metal segment is connected to the end of the first metal segment away from the porous foam metal part; and a thickness of the second metal segment is equal to a thickness of the end of the first metal segment away from the porous foam metal part, and

wherein the at least one solid metal part has a third metal segment; and in the first direction, the third metal segment is connected between the porous foam metal part and the first metal segment, with a thickness of the third metal segment=(0.95˜1)×thickness of the porous foam metal part; optionally the thickness of the third metal segment is equal to the thickness of the end of the first metal segment close to the porous foam metal part.

2 . The current collector according to claim 1 , wherein a thickness of the at least one solid metal part is smaller than or equal to a thickness of the porous foam metal part; and/or in the at least one solid metal part connected to the first edge and/or the second edge, in the first direction, a thickness of an end of the at least one solid metal part away from the porous foam metal part is smaller than a thickness of an end of the at least one solid metal part close to the porous foam metal part.

3 . The current collector according to claim 1 , wherein a surface of the third metal segment distributed in the thickness direction of the current collector is covered with an insulating layer; optionally a thickness of a single insulating layer is ≥50 nm, and/or the thickness of the single insulating layer is ≤200 nm; and optionally the porous foam metal part is porous foam copper, and the solid metal part is solid copper.

4 . An electrode plate, comprising the current collector according to claim 1 .

5 . An electrode assembly, comprising a separator and electrode plates, wherein each of the electrode plates is according to claim 4 , wherein in the thickness direction of the current collector, the separator and the porous foam metal part are distributed as laminated.

6 . A battery cell, comprising a housing and the electrode assembly according to claim 5 , wherein the electrode assembly is accommodated in the housing.

7 . A battery, comprising a box body and a plurality of battery cells, wherein each of the plurality of battery cells is according to claim 6 , wherein the plurality of the battery cells are accommodated in the box body.

8 . An electrical device, comprising at least one battery, each of which is according to claim 7 .

9 . A current collector, comprising:

a porous foam metal part, the porous foam metal part comprises a first edge and a second edge oppositely distributed in a first direction, and the first direction is perpendicular to a thickness direction of the current collector and of the porous foam metal part; and

at least one solid metal part, wherein the at least one solid metal part is connected to the first edge and/or the second edge,

wherein the porous foam metal part, including the first edge and/or the second edge to which the at least one solid metal part is connected, is uncompressed,

wherein:

the at least one solid metal part has a first metal segment; and in the first direction, a thickness of the first metal segment gradually decreases from an end thereof close to the porous foam metal part to an end thereof away from the porous foam metal part; and the solid metal part has a second metal segment; in the first direction, the second metal segment is connected to the end of the first metal segment away from the porous foam metal part; and a thickness of the second metal segment is equal to a thickness of the end of the first metal segment away from the porous foam metal part,

the at least one solid metal part has a third metal segment; and in the first direction, the third metal segment is connected between the porous foam metal part and the first metal segment, with a thickness of the third metal segment=(0.95˜1)×thickness of the porous foam metal part,

a surface of the third metal segment distributed in the thickness direction of the current collector is covered with an insulating layer, and

a thickness of a single insulating layer is ≥50 nm, and/or a thickness of the single insulating layer is ≤200 nm; and the porous foam metal part is porous foam copper, and the solid metal part is solid copper.