Welding clamp
A welding clamp for use in battery manufacturing is described. The welding clamp includes a plurality of clamping portions used to fit and clamp a case of a battery cell, the clamping portion includes a body portion and a connecting portion, and the connecting portion is detachably connected to the body portion; and a wear-resistant layer is connected to a surface of the connecting portion facing the case. In the process of welding the case and the end cover of the battery cell, through fitting and clamping the case by the clamping portion of the welding clamp, the clamping portion can play a position-limit role to the wall of the case to relieve the deformation of the case during the welding process, thereby improving the welding quality of the case and the end cover and thus improving the production quality of the battery cell.
1 . A welding clamp, comprising:
a plurality of clamping portions; the plurality of clamping portions including:
a first clamping portion having a first clamping surface;
a second clamping portion having a second clamping surface parallel to and facing the first clamping surface;
a third clamping portion having a third clamping surface perpendicular to the first clamping surface;
a fourth clamping portion having a fourth clamping surface parallel to and facing the third clamping surface;
wherein the first, second, third and fourth clamping surfaces are adapted to form together a perimeter of a four-sided clamping recess, the clamping recess being provided for fitting and clamping a four-sided case of a battery cell;
each clamping portion including:
a body portion with a groove, and
a wear piece detachably connected to the body portion in the groove, such that a rectangular clamping surface of the wear piece forms at least a part of the clamping surface of the clamping portion;
wherein, a contact layer of one of Teflon, polybenzimidazole, polyamide-imide, polyimide and poly (ether-ether-ketone) is bonded with a bonding layer to the rectangular clamping surface of the wear piece of each clamping portion, such that each of the four sides of a four-sided case of a battery that is fitted and clamped in the four-sided clamping recess is in contact with the contact layer of the wear piece of one of the clamping portions.
2 . The welding clamp according to claim 1 , wherein the contact layer has a thickness h satisfying 0.1 mm≤h≤1 mm.
3 . The welding clamp according to claim 2 , wherein 0.2 mm≤h≤0.5 mm is satisfied.
4 . The welding clamp according to claim 1 , wherein the melting point of the bonding layer is A, satisfying A≥180° C.
5 . The welding clamp according to claim 4 , wherein A≥200° C. is satisfied.
6 . The welding clamp according to claim 1 , wherein the contact layer of the wear piece of each of the first, second, third and fourth clamping portions at least partially protrudes from respectively the first, second, third and fourth clamping surfaces.
7 . The welding clamp according to claim 1 , wherein the rectangular clamping surface of each wear piece is completely covered by the contact layer.