Battery

Abstract

A battery comprising a housing (2) and a cap plate (1), characterized in that the housing (2) is cylindrical and defines a cylindrical cavity (22) with an opening (23), the cap plate (1) is arranged at the opening (23) and comprises a central portion (10), a first projection (11) and a welding portion (16), wherein the central portion (10) is circular, the first projection (11) circularly surrounds the central portion (10) and extends towards the cylindrical cavity (22), the welding portion (16) circularly surrounds the first projection (11) and is provided with a welding surface (12) facing towards the cylindrical cavity (22); the first projection (11) extends through the opening (23) into the cavity (22) and is located at the opening (23) of the housing (2) its end surface is connected to the welding surface (12) to which it is connected by laser welding; the first projection (11) has a second welding surface (13) facing the cavity (22);the battery further comprises a coil core (3), a negative current collector (4) and support blocks (5), wherein the coil core (3), the negative current collector (4) and the support blocks (5) are arranged in a layered manner within the cavity (22) in the axial direction of the housing (2); the negative current collector (4) is connected to the negative electrode of the coil core (3), the support blocks (5) are arranged between the negative current collector (4) and the second welding surface (13), distributed circularly and uniformly around the central axis of the cap plate (1), and the support blocks (5) are fixed to the second welding surface (13) by welding;the battery further comprises a positive terminal member (6) and an insulating sealing member (8), wherein the housing (2) is provided with a through-hole (21) on the side opposite to the opening (23) in which the positive terminal member (6) and the insulating sealing member (8) are installed, the insulating sealing member (8) is located between the positive terminal member (6) and the housing (2), and the central axis of the through-hole (21) coincides with the central axis of the cap plate (1);