A rapid evaluation method of battery pack cycle life
A technology of cycle life and battery packs, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems that affect the progress of research and development, time-consuming and other problems, achieve true and reliable results, and shorten the test cycle
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Embodiment 1
[0044]Take 2 new 6-DZF-20 batteries, mark 1# and 2# respectively, charge and discharge, and measure the full-charged internal resistance R 0 (measured after standing for 4 hours) and air-electric internal resistance R 1 (measured within 1h after discharge), calculate R 1 / R 0 The value is averaged and recorded as the internal resistance ratio of the 0th cycle.
[0045] Then carry out the charge and discharge cycle, and measure the full charge internal resistance R after every 50 cycles 0 And the internal resistance value R 1 , calculate R 1 / R 0 The values are averaged and the results are shown in Table 1.
[0046] The conditions for the first charge and discharge and subsequent charge and discharge cycles are as follows:
[0047] Charging: Constant voltage 2.46V / cell, 0.4C current charging for 5h;
[0048] Discharge: 0.5C current discharge for 2h.
[0049] Table 1
[0050]
[0051] Using Table 1 data, R 1 / R 0 The average value of the value is used as the int...
Embodiment 2
[0053] The method for quickly evaluating the cycle life of a valve-regulated lead-acid battery pack in this embodiment includes the following steps:
[0054] (1) Take a 6-DZF-20 valve-regulated lead-acid battery, number 1#, measure the internal resistance R after fully charging and standing for 4 hours q0 , and then discharge with a current of 0.5C for 2h, and measure the internal resistance R again within 1h after the discharge q1 ; The measured results are shown in Table 2.
[0055] Table 2
[0056] Internal resistance value or internal resistance ratio 1# Q 0 (mΩ)
10.3 Q 1 (mΩ)
15.6 Q 1 / Rq 0
1.51
[0057] (2) Carry out 50 charge-discharge cycles to the battery pack; the specific conditions of the charge-discharge cycle are as follows:
[0058] Charging: Constant voltage 2.46V / cell, 0.4C current charging for 5h;
[0059] Discharge: 0.5C current discharge for 2h.
[0060] (3) Repeat step (1) to measure the internal resistan...
Embodiment 3
[0066] The rapid evaluation method for the cycle life of the valve-regulated lead-acid battery pack of this embodiment is the same as that of embodiment 2, the difference is that the valve-regulated lead-acid battery pack containing four 6-DZF-20 batteries is taken, and the batteries are respectively numbered 1#, 2 #, 3#, 4#, the results are shown in Table 4.
[0067] Table 4
[0068] Internal resistance value or internal resistance ratio 1# 2# 3# 4# Q 0 (mΩ)
10 10.1 9.9 10.1 Q 1 (mΩ)
15.3 15.8 15.1 15.2 Q 1 / Rq 0
1.53 1.56 1.53 1.50 Rh 0 (mΩ)
9.8 9.9 9.8 9.9 Rh 1 (mΩ)
18.8 20.2 21.5 19.5 Rh 1 / Rh 0
1.92 2.04 2.19 1.97
[0069] Calculated to get R h1 / R h0 The values are 1.92, 2.04, 2.19, 1.97, R q1 / R q0 The values are 1.53, 1.56, 1.53, 1.50, respectively.
[0070] will calculate the R h1 / R h0 value and R q0 / R q1 value comparison figure 1 For battery life status...
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