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摘要:
针对当前锂电池安全性研究侧重于特征参数实验测量及反应机理分析，基于风险评估理论提出锂电池热失控风险指数并应用于锂电池安全定量评价，以点燃参数乘以环境因子表征锂电池热失控风险发生概率，以热释放参数和火势增长参数表征风险造成后果。选取陆空联运的冷链货物温度监测装置中常用的锂锰电池（CR）和锂亚硫酰氯电池（ER），利用自主设计搭建的锂电池热失控实验平台获取上述参数并计算热失控风险指数。实例分析表明：适合于陆空联运的冷链货物ER14250型锂电池热失控风险指数为0.84，其安全性相对最高。所提方法可直接指导陆空联运冷链货物温度监测装置的锂电池选择，保证运输安全。
Abstract:Aimed at the current research on the safety of lithium batteries, focusing on the experimental measurement of characteristic parameters and analysis of reaction mechanisms, this paper proposes the thermal runaway risk index of lithium batteries based on risk assessment theory and applies it to the quantitative evaluation method of lithium battery safety. The ignition parameter is multiplied by the environmental coefficient to characterize the probability of thermal runaway. The consequences of risk are characterized by the heat release parameter and fire growth parameter. Lithium-manganese batteries (CR) and lithium-thionyl chloride batteries (ER) commonly used in temperature monitor devices in cold-chain cargo of air-ground multimodal transport are selected, and the above parameters are obtained by the self-designed lithium battery thermal runaway experimental platform. Thermal runaway risk index is calculated. The example analysis shows that the thermal runaway risk index value of ER14250 lithium battery is 0.84, which demonstrates higher safety than others. This method can directly guide the selection of lithium batteries for temperature detection devices in air-ground multimodal transport for cold-chain cargo to ensure the safety of transportation.
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图 2 不同电池热失控温度曲线对比
Figure 2. Comparison of thermal runaway temperature curves among different batteries
图 3 空运环境不同电池热失控温度曲线对比
Figure 3. Comparison of thermal runaway temperature curves among different batteries in air transport environment
表 1 锂电池基本参数
Table 1. Basic parameters of lithium battery
型号 尺寸/(mm×mm) 容量/(mA·h) 电压/V 正极材料 电解质类型 CR2032 2×3.2 240 3 二氧化锰(MnO2) PC(碳酸丙烯酯)+DME(二甲氧基乙烷) CR2 15×27 850 3 CR123A 17×34.5 1 400 3 ER14250 14×25 800 3.6 亚硫酰氯(SOCL2) 非水电解质 ER14335 14×33.5 1 600 3.6 ER14505 14×50.5 2 400 3.6 
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表 2 低压与常压环境下电池热失控参数对比
Table 2. Comparison of thermal runaway parameters of battery under low and normal pressure
型号 低压 常压 T0/℃ t0/s Tmax/℃ T0/℃ t0/s Tmax/℃ CR2032 172.6 306 319.7 166.5 243 358.8 CR2 172.9 291 527.4 166.7 267 607.3 CR123A 172.9 333 599.8 167.5 303 641.8 ER14250 169.5 321 169.5 166.9 282 253.6 ER14335 174.1 294 185 174.6 240 312.1 ER14505 179.7 276 244.5 170.8 270 545.9
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表 3 风险指数量化评价结果
Table 3. Quantitative evaluation result by risk indexes
型号 常压(a=1) 低压(a=0.8) S P V S P V TI THRI FGI TI THRI FGI CR2032 2.83 3.19 2.10 2.37 2.94 2.46 1.86 1.24 CR2 2.87 3.98 2.27 3.15 2.92 3.11 2.13 1.81 CR123A 2.93 4.12 2.32 3.26 2.98 3.26 2.14 1.87 ER14250 2.89 2.90 0.84 0.84 2.96 1.25 0.67 0.22 ER14335 2.84 3.21 1.93 2.18 2.93 1.69 0.61 0.28 ER14505 2.88 3.82 2.39 3.17 2.92 2.44 0.78 0.51
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