Abstract: The present disclosure discloses an energy storage unit and an energy storage system. The energy storage unit includes an accommodating apparatus, a temperature adjusting structure disposed on a bottom of the accommodating apparatus, and a temperature adjusting structure disposed on the bottom of the accommodating apparatus. A plurality of battery cells disposed in an inner cavity of the accommodating apparatus. The thermal conductive structure includes a thermal conductive part and a plurality of heat dissipation parts. A temperature equalizing cavity is formed between the plurality of heat dissipation parts and the temperature adjusting structure. The temperature adjusting structure includes a heat dissipation flow channel and is configured to adjust a temperature of the energy storage unit through the heat dissipation flow channel.

Abstract: A top cover assembly, a battery cell, an assembling method for a battery cell, and an electric device. The top cover assembly includes: a top cover loading-into-housing assembly, comprising an insulation member, an adapter, a first end cover and a pole connected to the adapter, wherein the projection contour of the first end cover falls within an area defined by the outer edge contour of the insulating member. A projection contour of the first end cover is located within a region defined by an outer edge contour of the insulation member, and the pole sequentially penetrates the insulation member and the first end cover.

Abstract: A lower plastic member has a first surface and a second surface. The first surface has at least one first groove. The second surface is arranged opposite to the first surface in a thickness direction of the lower plastic member. The second surface has at least one second groove. Each of the at least one second groove is in communication with a corresponding first groove of the at least one first groove in a length direction of the lower plastic member. A bottom of each of the at least one first groove extends to the second surface. The lower plastic member features a structural design with the first groove and the second groove that are in communication with each other in the length direction of the lower plastic member and arranged opposite to each other in the thickness direction of the lower plastic member.

Abstract: Provided are an end cover assembly, a battery cell, a battery module, and an energy storage device. The end cover assembly includes a cover plate, an explosion-proof valve, a first electrode terminal, and a second electrode terminal. The cover plate has a first protrusion, at least one second protrusion, and at least one third protrusion. The first protrusion has a mounting hole, and the at least one second protrusion and the at least one third protrusion are arranged at two opposite sides of the first protrusion in a length direction of the cover plate, respectively. The explosion-proof valve is mounted in the mounting hole. The first electrode terminal and the second electrode terminal are arranged on the cover plate and spaced apart from each other.