钠电池 PACK 的温度采集线有什么作用？

What are the functions of temperature collection wires for sodium-ion battery PACK?

温度采集线连接 BMS 主板与贴附电芯表面 NTC 热敏探头，整套 PACK 温度监测感知网络，三大核心功能支撑热管理与安全保护。第一多点温度同步监测，实时采集模组最高、最低、平均温度，识别局部电芯过热或极寒低温状态，同步传输数据至 BMS。第二联动热管理系统，低温低于设定阈值自动启动加热膜升温，高温触发风冷 / 水冷散热，将电芯长期维持 20~35℃最优工作区间，低温避免析钠短路，高温抑制电解液分解产气。第三故障预警防护，单颗电芯温升超标立即触发过温保护，切断充放电回路，规避热失控连锁风险。大容量储能 PACK 每一串模组布置 3~5 路测温点位，密集监控缩小温差误差；温度采集线为低压弱电线路，与高压线束分槽布线隔离电磁干扰，探头使用导热双面胶紧密贴合电芯壳体保证测温精准。

Temperature collection wires connect the BMS mainboard and NTC thermistors attached to cell surfaces, forming the whole PACK temperature sensing network with three core functions supporting thermal management and safety protection. First, synchronous multi-point temperature monitoring: real-time collection of the maximum, minimum and average module temperature to identify local overheating or extremely low temperature of single cells, and transmit data to BMS synchronously. Second linkage with thermal management system: heating films automatically start to raise temperature when low temperature falls below the threshold, while air/water cooling activates under high temperature to maintain cells within the optimal 20~35℃ working range for a long term, avoiding sodium precipitation short circuits at low temperature and restraining electrolyte decomposition gas generation at high temperature. Third fault early warning and protection: over-temperature protection activates immediately when the temperature rise of a single cell exceeds the standard to cut off the charge-discharge loop and avoid chain thermal runaway risks. Large-capacity energy storage PACKs arrange 3~5 temperature measuring points for each string of modules for intensive monitoring to narrow temperature difference errors. Temperature collection wires are low-voltage weak-current circuits, routed separately from high-voltage harnesses to isolate electromagnetic interference, and probes are tightly attached to cell shells with thermal double-sided adhesive to guarantee accurate temperature measurement.