Low-voltage lithium battery pack battery management system

The invention discloses a low-voltage lithium battery pack battery management system. The system comprises a power supply module, a current sensor signal sampling module, a switching value acquisitionmodule, a load relay driving module, a charging relay driving module, a temperature management relay driving module, a communication module, a single voltage sampling module, a module temperature acquisition module, a passive equalization module, a voltage monitoring module, an MCU module and a crystal oscillator module. The device is simple in structure, is stable and reliable, guarantees the voltage consistency of the single cells, and avoids single overvoltage at the same time; voltage and resistance value sampling is convenient; the voltage value acquisition and calculation principle is simple, the cost is low, and the reliability is high; connection and disconnection control of each load loop can be realized; the heat dissipation or heating of the matched lithium battery pack is actively realized; and when t