Lithium battery heat balance system device and method based on improved PID intelligent control

The invention belongs to the technical field of new energy batteries, and particularly relates to a lithium battery heat balance system device and method based on improved PID intelligent control, and the lithium battery heat balance system device comprises a box body with a three-layer structure, the bottom layer is a counterweight cavity, the middle layer is a battery cavity, and the upper layer is an electric control cavity. Lithium battery modules, a liquid circulating pipeline, a temperature sensor, a battery management system, a PLC (programmable logic controller) and the like are arranged in the box body, the temperature in the battery box body and the temperature of each lithium battery module can be monitored in real time, monitored temperature data are fed back to the PLC through the battery management system, the PLC performs temperature control judgment, and the temperature of each lithium battery module is controlled by the PLC. PID control is carried out based on a self-adaptive particle swarm a