Battery pack

Abstract

A battery pack comprising batteries, characterized in that each of the batteries comprises an explosion-proof structure, a wound core (140) and a housing (150), wherein the wound core (140) is installed inside the housing (150), one end of the housing (150) is provided with an opening (151), and the cover plate (110) is connected to the housing (150) to close the opening (151), wherein the explosion-proof structure comprises a cover member (110) provided with a first weakened portion (111) and a second weakened portion (112), wherein the thickness of the cover plate (110) at the first weakened portion (111) is less than the thickness of the cover plate (110) at the second weakened portion (112), wherein the first weakened portion (111) comprises a first segment (1111) and a second segment (1112) connected to each other, wherein the first segment (1111) has a first end (1113) and a second end (1114),wherein the second segment (1112) has a third end (1115) and a fourth end (1116), and wherein the distance between the first end (1113) and the third end (1115) is greater than the distance between the second end (1114) and the fourth end (1116).,