Nonaqueous electrolyte secondary battery and battery module

Abstract

According to the present disclosure, it is possible to appropriately prevent a shortage of a nonaqueous electrolyte solution in an electrode body and keep battery performance of a nonaqueous electrolyte secondary battery at a favorable state. A nonaqueous electrolyte secondary battery disclosed herein includes an electrode body and a nonaqueous electrolyte solution. The electrode body includes an electrolyte solution passage that is a flow passage through which the nonaqueous electrolyte solution flows between the inside and the outside of the electrode body. When a region of a negative-electrode composite material layer that is in contact with the electrolyte solution passage is referred to as a damming portion and a region that is located on the center side relative to the damming portion is referred to as a liquid retaining portion, the damming portion contains a negative electrode active material of which an electrical potential relative to a positive electrode active material is high and a ratio of expansion or contraction due to an increase or decrease in SOC is high, when compared to a negative electrode active material contained in the liquid retaining portion. With this configuration, the electrolyte solution passage can be closed by the damming portion in a charge state where the damming portion expands, and therefore leakage of the nonaqueous electrolyte solution can be suppressed.