Analysis of ternary materials, lithium iron phosphate, lithium manganate power battery failure

by:CTECHi     2021-08-16

Ternary material power battery failure analysis for pure electric passenger vehicles using ternary material power batteries, rechargeable energy storage system mismatch, low SOC alarm, undervoltage of on-board energy storage device type, single battery undervoltage alarm and The poor consistency of power batteries is the top five failure types, and the TOP5 failures account for 78% of the total failures. For plug-in passenger cars using ternary material power batteries, SOC high alarm and SOC low alarm are the main fault sources, and these two types of faults account for 76% of the total faults. The faults of pure electric vehicles using ternary material power batteries are relatively scattered. The four major faults of poor power battery consistency, single battery overvoltage alarm, single battery undervoltage alarm and on-board energy storage device overvoltage account for 66 of the total failures. %. Failure analysis of lithium iron phosphate power battery. The pure electric passenger car using lithium iron phosphate power battery has poor power battery consistency, SOC jump alarm, undervoltage of vehicle energy storage device type, overvoltage of vehicle energy storage device type, and low SOC alarm. The main source of failures, TOP5 failures account for 96% of the total failures of pure electric passenger cars with lithium iron phosphate power batteries. Among the fault distribution of plug-in passenger cars using lithium iron phosphate power batteries, 98% are concentrated in SOC-related faults, of which 96% are alarms for excessive SOC. Among the battery faults related to pure electric buses equipped with lithium iron phosphate power batteries, in addition to the relatively low SOC jump and high SOC alarm, other faults such as low SOC, overvoltage of the on-board energy storage device, and overvoltage of the single battery The proportion of failures such as low voltage, single battery undervoltage, and poor consistency of power battery is 9%-28%, and the distribution is relatively even. In pure electric special vehicles using lithium iron phosphate power batteries, the three major faults of poor power battery consistency, single battery overvoltage alarm, and low SOC alarm account for 66% of the total faults. Lithium manganate power battery failure analysis. In the fault distribution of pure electric passenger vehicles using lithium manganate power batteries, single battery undervoltage alarm is the main source of faults, and its faults account for the total faults of lithium manganate power batteries for pure electric passenger cars. 99.9% of the amount. The battery-related failures of pure electric buses equipped with multi-element composite and lithium manganate batteries are mostly concentrated in SOC jumps. Among them, the failure rate of multielement composite batteries is 97.9%, and that of lithium manganese oxide is 70.9%. Other failures are rare. The main source of failure for pure electric special vehicles using lithium manganate power batteries is overvoltage alarms for single cells, accounting for 99.4% of the total failure rate.

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