LITHIUM-ION BATTERY, BATTERY MODULE, BATTERY PACK AND POWERED DEVICE

The present application discloses a lithium-ion battery, which has a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte solution comprising a lithium salt and a solvent, wherein based on the total weight of the electrolyte solution, the percentage by mass of the lithium salt in the electrolyte solution is a %, and the lithium ion battery satisfies 5≤a≤10; and the load on single side of the negative electrode sheet is W grams per 1540.25 mm2, and a and W satisfy 25≤a/W≤50; and the solvent comprises dimethyl carbonate. The lithium ion battery has good safety and high-temperature cycling performance, and also has good kinetic performance.