A rapid estimation method for the actual capacity of decommissioned lithium-ion batteries in electric vehicles
A lithium-ion battery and actual capacity technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of low efficiency, long time consumption, high cost, etc., and achieve the effect of improving estimation efficiency and reducing estimation cost
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[0041] Three typical 18650 ternary lithium-ion batteries (N=3) that were decommissioned from a certain electric vehicle were selected, and the nominal capacity of the single lithium-ion battery is 3.2Ah.
[0042] combine figure 1 and figure 2 , the estimation method for these three batteries is as follows:
[0043]Step a: 3 single lithium-ion batteries (N=3) are connected in parallel to form a parallel battery pack, the current of each single lithium-ion battery is detected by a current Hall sensor, and the charging and discharging current is provided by a general-purpose charging and discharging device;
[0044] The actual capacities of the three single lithium-ion batteries are denoted as C 1x 、C 2x 、C 3x .
[0045] Step b: Put the battery pack in parallel for 1 hour, charge with a constant current at a current of 2.8A (0.29NC=0.29×3×3.2A) until the cut-off voltage of the battery is 4.2V, and then charge with a constant voltage until the charging current drops It is 0...
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