Power battery cascade utilization screening group method
A battery cell cascade and battery cell technology, which is applied in the field of power battery cascade utilization, can solve problems such as the technical difficulties of matching and grouping consistency of retired battery cells, and achieve the effect of improving service life and ensuring self-discharge.
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Embodiment 1
[0025] Three ternary power lithium-ion batteries were disassembled from the three electric vehicles numbered 1, 2, and 3 respectively, and the 9 retired batteries were screened into groups through the following steps.
[0026] 1) Preliminary screening, remove 3 batteries with poor appearance such as scratches, corrosion, liquid leakage, severe protrusions or dents on the shell, leaving 6 batteries.
[0027] 2) For the 6 batteries (initial capacity of 40Ah) after preliminary screening, obtain the parameter values of three important parameters: capacity, OCV (open circuit voltage) and AC internal resistance (the values can be obtained from the BMS system of the battery where the battery is located) It can also be obtained by testing), as shown in Table 1; then, according to the obtained parameter values, the following screening is performed on the batteries: a, remove the batteries whose capacity is lower than 40% of the initial capacity; b, calculate all batteries The param...
Embodiment 2
[0032] Screen the decommissioned batteries in the same way as in Example 1, the difference is that the initial capacity of the batteries is 80Ah; the important parameter values of the batteries obtained in step 2) are shown in Table 2, so batteries 4 to 4 are excluded. 6; Step 3) The data points of the change of DCR increase rate with capacity decay rate are as follows: image 3 As shown, the three cells 1 to 3 are divided into one group.
[0033] Table 2, the important parameter values of the electric core of embodiment 2
[0034] No. Capacity / Ah OCV / V Resistance / mΩ 1 62.8 3.69 1.13 2 63.2 3.66 1.31 3 62.6 3.67 1.21 4 63.1 3.69 2.73 5 54.4 3.57 2.51 6 73.0 3.87 0.96
Embodiment 3
[0036] Screen the decommissioned batteries in the same way as in Example 1, the difference is that the initial capacity of the batteries is 50Ah; the important parameter values of the batteries obtained in step 2) are shown in Table 3, so batteries 4 to 4 are excluded. 6; Step 3) The data points of the change of DCR increase rate with capacity decay rate are as follows: Figure 4 As shown, cells 1 and 2 are divided into a group, and the DCR of cell 3 increases greatly, and the performance difference from cell 1 and cell 2 is large. Cells with similar performance are paired into groups).
[0037] Table 3, the important parameter values of the electric core of embodiment 3
[0038] No. Capacity / Ah OCV / V Resistance / mΩ 1 36.4 3.97 0.83 2 35.5 3.94 0.92 3 35.7 3.95 0.88 4 36.1 3.97 2.09 5 31.1 3.84 1.79 6 42.8 4.16 0.70
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