A battery module, characterized by comprising: a plurality of batteries in a row or a plurality of rows arranged in a longitudinal direction (y); each of the batteries comprises a top cover and two electrode terminals disposed on the top cover at an interval in a transverse direction; a positioning bracket fixed to one of the plurality of batteries and provided with a first opening penetrating in an up-and-down direction, wherein the positioning bracket comprises a first main body portion; two first positioning holes disposed in the first main body portion and configured to receive the corresponding electrode terminals; and a first extending portion formed on one side of the first main body portion in a longitudinal direction, wherein the first opening is disposed in the first extending portion; a circuit board, comprising a second main body portion disposed above the positioning bracket; and a second mounting portion located below the main body portion in the first opening of the positioning bracket and supported on the one of the plurality of batteries a thermistor, fixedly disposed on the second mounting portion of the circuit board; a fixing cover plate, tightly pressing the second mounting portion of the circuit board in the up-and-down direction to fix the second mounting portion to the top cover of the one of the plurality of batteries, thereby firmly fixing the thermistor to the top cover of the one of the plurality of batteries; and an electrical connecting piece located above the first main body portion of the positioning bracket and connected to the corresponding electrode terminals of two adjacent batteries of the plurality of batteries, the electrical connection piece fixing the position bracket to the one of the plurality of batteries; wherein the circuit board is provided with a reinforcing plate around the position of the thermistor, and the reinforcing plate extends in the up-and-down direction and exceeds a thermistor and the fixing cover plate directly and tightly presses the reinforcing plate in the up-and-down direction, to tightly press the second mounting portion of the circuit board. a plurality of batteries in a row or a plurality of rows arranged in a longitudinal direction (y); each of the batteries comprises a top cover and two electrode terminals disposed on the top cover at an interval in a transverse direction; a positioning bracket fixed to one of the plurality of batteries and provided with a first opening penetrating in an up-and-down direction, wherein the positioning bracket comprises a first main body portion; two first positioning holes disposed in the first main body portion and configured to receive the corresponding electrode terminals; and a first extending portion formed on one side of the first main body portion in a longitudinal direction, wherein the first opening is disposed in the first extending portion; a circuit board, comprising a second main body portion disposed above the positioning bracket; and a second mounting portion located below the main body portion in the first opening of the positioning bracket and supported on the one of the plurality of batteries a thermistor, fixedly disposed on the second mounting portion of the circuit board; a fixing cover plate, tightly pressing the second mounting portion of the circuit board in the up-and-down direction to fix the second mounting portion to the top cover of the one of the plurality of batteries, thereby firmly fixing the thermistor to the top cover of the one of the plurality of batteries; and an electrical connecting piece located above the first main body portion of the positioning bracket and connected to the corresponding electrode terminals of two adjacent batteries of the plurality of batteries, the electrical connection piece fixing the position bracket to the one of the plurality of batteries; wherein the circuit board is provided with a reinforcing plate around the position of the thermistor, and the reinforcing plate extends in the up-and-down direction and exceeds a thermistor and the fixing cover plate directly and tightly presses the reinforcing plate in the up-and-down direction, to tightly press the second mounting portion of the circuit board.