Multi-time-scale comprehensive early warning method for lithium iron phosphate battery
A lithium iron phosphate battery, multi-time scale technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of potential safety hazards of lithium iron phosphate batteries, inability to realize timely alarm, etc., and achieve the effect of improving the speed of early warning
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specific Embodiment approach 1
[0060] Specific implementation mode one: the following combination figure 1 Describe this embodiment, a multi-time scale comprehensive early warning method for lithium iron phosphate batteries described in this embodiment,
[0061] The method includes:
[0062] Set the voltage difference minor fault threshold ΔU of the battery 1 , voltage difference medium fault threshold ΔU 2 , voltage difference severe fault threshold ΔU 3 ;
[0063] Voltage difference change rate minor fault threshold U rate1 , the voltage difference rate of change medium fault threshold U rate2 , the voltage difference change rate critical fault threshold U rate3 ;
[0064] Battery temperature peak critical fault threshold T max3 , battery temperature peak rate of change severe fault threshold dT max3 , battery heat generation internal resistance difference fault threshold ΔR max ;
[0065] Slight fault threshold ΔSOC1 of remaining battery power, medium fault threshold ΔSOC2 of remaining battery...
specific Embodiment
[0119] For the case where the internal short-circuit resistance of the cell is 5Ω, the short-circuit internal resistance is small at this time, and the early warning strategy based on voltage consistency is not effective, and it takes more than 48000s to realize the early warning alone. Although the strategy based on the consistency of the internal resistance of heat generation can quickly detect abnormalities, since temperature is a relatively indirect physical quantity and is affected by environmental conditions and the spatial distribution of batteries in the battery module, it is difficult to detect abnormalities based on the internal resistance of heat generation. The difference in resistance distinguishes different fault levels. At this time, the early warning strategy based on the consistency of the state of charge has a very good effect. Although the estimated value of the state of the internal short-circuit battery lags behind the actual state of the battery, from the ...
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