A recovery method for electric vehicle power balance fault recovery with constant capacity charging and discharging
A fault recovery and electric vehicle technology, applied in electric vehicles, secondary battery charging/discharging, battery/fuel cell control devices, etc., can solve problems such as inconsistent internal resistance, battery life decay, and inconsistent capacity of single batteries. Achieve the effect of improving accuracy and efficiency and eliminating voltage difference
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specific Embodiment 1
[0030] Take a 92S32P ternary lithium 18650-ion battery pack as an example.
[0031] (a) Charging, the charging cut-off voltage is as Figure 4 shown.
[0032] (b) Discharge, the discharge cut-off voltage is as Figure 5 shown.
[0033] (c) Set equalization target parameters and equalization charge and discharge current:
[0034] The charging cut-off voltage difference specification is <13mV, the discharge cut-off voltage difference specification is <130mV, the balanced charging current is 6A, and the balanced discharging current is 6A. The system automatically calculates the balance charge and discharge time as shown in the table below, some batteries need to be charged, and some batteries need to be discharged.
[0035]
[0036]
[0037] (d) The comparison between the expected charging cut-off voltage after equalization and the actual charging cut-off voltage after equalization Image 6 shown.
[0038] (e) The comparison between the expected discharge cut-off volt...
specific Embodiment 2
[0041] Increase the balanced charging current and balanced discharging current, set the balanced target parameters and balanced charging and discharging current:
[0042]The charging cut-off voltage difference specification is <13mV, the discharge cut-off voltage difference specification is <130mV, the balanced charging current is 10A, and the balanced discharging current is 10A. The system automatically calculates the balance charge and discharge time as shown in the table below, some batteries need to be charged, and some batteries need to be discharged.
[0043] Rechargeable Battery
6#
11#
80#
85#
86#
Charging time (s)
48
16
112
178
48
discharge battery
65#
78#
89#
90#
Discharge time (s)
80
14
80
80
[0044] The equalization effect is as follows:
[0045]
[0046] As shown in the table above, after equalization, the charging voltage difference is reduced from 21mV to 13mV, t...
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