Abstract: The disclosure relates to a secondary battery including: a cap assembly including a cap plate including an electrode lead-out hole and an electrode terminal disposed on the cap plate; a current collector including a main body located at a side of the cap plate and an extending portion extending toward the electrode terminal, where the extending portion includes a top plate connected to the electrode terminal and a side plate connected to the main body, and the side plate and the top plate are configured to form a recess; and an insulating protection component including a column portion disposed in the recess, where surfaces of the side plate and the top plate which form the recess are in contact with the column portion and covered by the column portion.

Abstract: The present disclosure relates to a secondary battery and a battery pack, and the secondary battery includes: an outer casing, comprising a case and a cap assembly connected to each other, the case is provided with an opening, the cap assembly includes a cap plate and an electrode terminal connected to the cap plate, wherein the cap plate is adapted to cover the opening; an electrode assembly accommodated in the case and including a main body and a tab extending out from the main body, wherein the tab is electrically connected to the electrode terminal; a vent connected to the outer casing; and an insulating member at least partially disposed between the electrode assembly and the vent, wherein a projection of the vent on the main body is at least partially covered by the insulating member.

Abstract: The present disclosure provides a battery pack including a mounting beam and a battery module connected to the mounting beam. The mounting beam is provided with a limiting protrusion and a limiting recess, and a limiting space is formed between the limiting protrusion and the mounting beam. The battery module is provided with a limiting sheet and an engaging assembly, at least a portion of the limiting sheet is inserted into the limiting space, and the engaging assembly is engaged with the limiting recess. In the battery pack according to the present disclosure, the cooperation between the limiting protrusion and the limiting sheet as well as the cooperation between the engaging assembly and the limiting recess can limit the battery module in directions X, Y and Z, thereby effectively fixing the battery module, simplifying the mounting process, and improving the mounting efficiency.

Abstract: The disclosure relates to a battery lower casing and a battery system. The battery lower casing includes: a bottom plate; a plurality of fixing beams sequentially connected end to end and fixed to the bottom plate; a cross beam disposed between the oppositely disposed fixing beams; and a supporting bracket including a base plate and limiting portions, wherein the limiting portions are connected to the base plate and disposed opposite to each other, the base plate and the oppositely disposed limiting portions enclose and form a recess, the base plate is connected to the fixing beam and an end portion of the cross beam adjacent to the fixing beam is embedded in the recess such that the cross beam is connected to the fixing beam.

Abstract: The disclosure relates to a secondary battery comprising: a cap assembly comprising a cap plate comprising an electrode lead-out hole and an electrode terminal disposed on the cap plate and covering the electrode lead-out hole; a current collector comprising a main body located at a side of the cap plate and an extending portion extending toward the electrode terminal, wherein the extending portion comprises a top plate connected to the electrode terminal and a side plate connected to the main body, the side plate is at least partially disposed in the electrode lead-out hole, and the side plate and the top plate are configured to form a recess; and an insulating protection component comprising a column portion disposed in the recess, wherein surfaces of the side plate and the top plate which form the recess are in contact with the column portion and covered by the column portion.