Device for testing internal volume of lithium battery

The utility model discloses a device for testing the internal volume of a lithium battery, which comprises an air cylinder, a barometer and an adapter used for connecting a tested battery, volume scale marks are arranged on the side wall of the air cylinder, a through air passage is arranged in the adapter, and the barometer, the air cylinder and the air passage are communicated with one another through connectors. According to the utility model, the adapter, the air cylinder and the barometer are arranged, the air passage is arranged in the adapter, and the air cylinder, the barometer and theair passage are communicated with one another through the connectors. When a battery is tested, an explosion-proof membrane in an explosion-proof valve of the tested battery is removed in advance, then an adapter is connected with the tested battery, and an air passage in the adapter is communicated with the interior of the battery through the explosion-proof valve; according to the method, the to-be-measured battery is