LI Bo.Analysis of influence of random vibration on mine-used vehicle-mounted explosion-proof lithium ion storage battery［J］.Industry and Mine Automation，2020,46（4）：113-116.
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摘要: 目前矿用锂离子蓄电池正弦振动试验方法无法全面反映蓄电池结构疲劳寿命、可靠性及其内部结构振动响应和激励状态下的振动特性。针对上述问题，采用随机振动中常用的虚拟激励法对矿用车载隔爆型锂离子蓄电池进行振动响应分析，从加速度响应、接触电阻、温度和隔爆腔体间隙变化4个方面分析了锂离子蓄电池在振动工况下可能产生的防爆性能和电气性能变化：被测锂离子蓄电池经过8 h的振动试验，隔爆腔体和壳盖处的隔爆间隙虽然还满足Ｉ类防爆电气设备的要求，但隔爆间隙显著增大，在该工况下长期使用存在隔爆失效（传爆）的风险；蓄电池正极接线柱由于工艺、材质或紧固期间装配的原因，接触电阻变大，导致局部发热量明显增加，如果温度持续上升可导致锂离子蓄电池薄膜融化，存在燃烧甚至爆炸风险。分析结果表明：随机振动试验方法可以充分暴露产品结构设计缺陷，可为车载锂离子蓄电池整体结构、应力变化、工作稳定性分析及疲劳寿命预测提供有效的数据支持。Abstract: At present,current sinusoidal vibration test method for mine-used lithium ion storage battery cannot fully reflect fatigue life and reliability of the battery structure, as well as vibration response of its internal structure and vibration characteristics under excitation state. Aiming at the above problems, the virtual excitation method commonly used in random vibration is used to analyze vibration response of mine-used vehicle-mounted explosion-proof lithium-ion storage battery. The change of explosion-proof performance and electrical performance of the battery under vibration condition is analyzed from four aspects of acceleration response, contact resistance, temperature and clearance of explosion-proof cavity. After 8 h vibration test of the tested lithium ion storage battery, although explosion-proof clearance at the flameproof cavity and shell cover still meets requirements of class I explosion-proof electrical equipment, the explosion-proof clearance significantly increases, and there is a risk of explosion-proof failure (explosion transmission) in long-term use under this working condition. Due to the process, material or assembly during fastening period, contact resistance of positive terminal post of the battery becomes larger, which significantly increases local heating. If temperature continues to rise, the lithium ion storage battery film would melt resulting in the risk of combustion or even explosion. The results show that the random vibration test method can fully expose defects of product structure design, provide effective data support for the overall structure, stress change, working stability analysis and fatigue life prediction of vehicle-mounted lithium ion battery under vibration conditions.
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