The present application relates to a secondary battery including a first adapter piece and an electrode assembly, the electrode assembly including a first electrode plate, a second electrode plate, a plurality of electrode tabs and a second electrode tab, ...

An electrode assembly includes a positive electrode material layer, where the positive electrode material layer of the electrode assembly includes a first positive electrode material LiMnFePO, a single-side thickness of the positive electrode material laye...

A battery module unit, including a plurality of sequentially stacked first brackets and a plurality of battery cells. Each first bracket includes a bracket body. At least one battery cell on one side of a first fixing bracket forms a first battery cell gro...