A battery module, comprising a battery cell, wherein the battery cell comprises a battery cell body, a first tab, a second tab, and a third tab, wherein the first tab, the second tab, and the third tab are separately electrically connected to the battery cell body, the first tab and the third tab have a first polarity, and the second tab has a second polarity; working together, the second tab and the first tab are capable of inputting a voltage and a current to the battery cell body or capable of outputting a voltage and a current from the battery cell body; working together, the second tab and the third tab are capable of inputting a voltage and a current to the battery cell body or capable of outputting a voltage and a current from the battery cell body; and the first polarity is a positive polarity, and the second polarity is a negative polarity; or the first polarity is a negative polarity, and the second polarity is a positive polarity, characterized in that the battery module further comprising a first battery protection board, wherein the first battery protection board comprises a first protection circuit, a first battery interface, and a second battery interface, and the first battery interface and the second battery interface are configured to be electrically connected to a component outside the battery module; the first battery interface is separately electrically connected to the second tab and the first tab by using the first protection circuit, and the first battery interface, the first tab, the battery cell body, the second tab, and the first protection circuit constitute a first conductive loop; the second battery interface is separately electrically connected to the second tab and the third tab by using the first protection circuit, and the second battery interface, the third tab, the battery cell body, the second tab, and the first protection circuit constitute a second conductive loop; and the first protection circuit is configured to detect voltages and currents that are in the first conductive loop and the second conductive loop, and when the voltages or the currents exceed a threshold range, the first protection circuit disconnects the first conductive loop and the second conductive loop. the battery cell comprises a battery cell body, a first tab, a second tab, and a third tab, wherein the first tab, the second tab, and the third tab are separately electrically connected to the battery cell body, the first tab and the third tab have a first polarity, and the second tab has a second polarity; working together, the second tab and the first tab are capable of inputting a voltage and a current to the battery cell body or capable of outputting a voltage and a current from the battery cell body; working together, the second tab and the third tab are capable of inputting a voltage and a current to the battery cell body or capable of outputting a voltage and a current from the battery cell body; and the first polarity is a positive polarity, and the second polarity is a negative polarity; or the first polarity is a negative polarity, and the second polarity is a positive polarity, characterized in that the battery module further comprising a first battery protection board, wherein the first battery protection board comprises a first protection circuit, a first battery interface, and a second battery interface, and the first battery interface and the second battery interface are configured to be electrically connected to a component outside the battery module; the first battery interface is separately electrically connected to the second tab and the first tab by using the first protection circuit, and the first battery interface, the first tab, the battery cell body, the second tab, and the first protection circuit constitute a first conductive loop; the second battery interface is separately electrically connected to the second tab and the third tab by using the first protection circuit, and the second battery interface, the third tab, the battery cell body, the second tab, and the first protection circuit constitute a second conductive loop; and the first protection circuit is configured to detect voltages and currents that are in the first conductive loop and the second conductive loop, and when the voltages or the currents exceed a threshold range, the first protection circuit disconnects the first conductive loop and the second conductive loop.