LiB合金在热电池中的应用特性研究

Application characteristics of LiB alloy anode in thermal battery

对不同锂含量LiB合金、不同厚度LiB合金及LiB合金热电池低温短路特性进行了研究。研究结果表明:LiB合金随着锂含量的提高或厚度的增加,其热稳定性变差;在一定范围内,提升LiB合金锂含量,不但可以大幅提升脉冲电压,还能显著增加放电容量,延长工作时间;在特定工况下,增加负极厚度可以有效抑制LiB合金高温自损耗现象,大幅延长电池的高温工作时间。短路机理研究表明:激活瞬间,LiB合金中金属锂因大温差热冲击溢出是导致电池发生低温短路故障的根本原因。

The characteristics of the LiB alloy with different lithium content and thickness and the short circuit at low temperature of LiB alloy as thermal battery anode were investigated.The results show that the thermal stability of LiB alloy decreases as the increase of the lithium content or thickness.Increasing the lithium content of LiB alloy within a certain range can not only greatly increase the pulse voltage,but also significantly increase the discharge capacity and extend the working time.Under certain operating condition,increasing the anode thickness can effectively resist the self-loss at high temperature of LiB alloy and greatly extend the working time at high temperature.At the activation moment,the overflow of the free Li in LiB alloy is the basic reason for the short circuit at low temperature of thermal battery.