Lithium battery detection device and detection method

The lithium battery detection device comprises a battery and a main body, the main body comprises a charging and discharging interface, the battery and the main body form a charging loop/discharging loop through the charging and discharging interface, and the main body comprises a control module, a communication module, an on-off switch, a charging module and a temperature measuring module. The control module is in communication connection with the communication module, the on-off switch and the temperature measurement module, the temperature measurement module detects the temperature of the main body and the on-off switch, the control module controls the on-off of the on-off switch and can cut off power in time, and the charging and discharging interface is electrically connected with the on-off switch and/or the charging module to charge and discharge the main body. The on-off switch comprises a plurality of switches connected in parallel, the on-off switch is electrically connected with the internal load,