BATTERY CELL, BATTERY MODULE, BATTERY PACK, ENERGY STORAGE SYSTEM, AND ELECTRIC VEHICLE

This application discloses a battery cell, a battery module, a battery pack, an energy storage system, and an electric vehicle. The battery cell includes one or more stress sensors. The stress sensors are located on the explosion-proof valve and face outside a housing of the battery cell, or the stress sensors are located on the explosion-proof valve and face inside a housing of the battery cell, and the stress sensors are connected to a processor of the battery module. Each stress sensor is configured to detect stress that is inside the battery cell and that acts on a corresponding position on the explosion-proof valve, and the one or more stress sensors are configured to transmit all obtained electrical signals to the processor. The processor determines a faulty target battery cell based on one or more received electrical signals. The solution of this application may be used to monitor stress of a battery cell in operation in real time, thereby improving timeliness of stress monitoring.