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The commonly used equalizing charging technologies for the equalization principle of lithium ion battery protection board include constant shunt resistance equalizing charging, on/off shunt resistance equalizing charging, average battery voltage equalizing charging, Switched capacitor equalizing charging, step-down converter equalizing charging, inductance equalizing charging, etc. When charging lithium-ion batteries in series, it is necessary to ensure that each battery is evenly charged, otherwise the performance and lifespan of the entire battery group will be affected during use.

It is necessary to adopt a balanced situation: in the case of battery production, the storage time is longer because different static power protection boards and various battery self discharge rates form the entire bundle, and the battery voltage has a significant pressure difference, but the same guarantee ability. Under balanced conditions, the function of balancing the voltage of the battery pack can achieve the effect of fully charged and fully discharged battery capacity, exerting a huge impact on the battery.

When the production and storage time of the battery pack is relatively long, due to the different static power consumption of each circuit of the protection board and the different self-discharge rates of each cell, the voltage of each string of batteries in the entire battery pack is inconsistent, resulting in significant voltage difference. However, under the condition of ensuring consistent capacity, the equalization function of the battery pack has the function of balancing voltage, which can achieve the full charging and discharging effect of the battery pack capacity, and make the battery pack play a great role.

The battery itself still has usable capacity, but due to the imbalance between the batteries and the safety voltage limit set to protect the battery, the battery system cannot continue to perform as expected. In addition, the service life of the battery on the vehicle is shorter than that of the vehicle itself. Even if the vehicle has not reached its retirement age, the battery needs to be replaced to meet the power performance. However, the cost of replacing batteries is quite high, which greatly restricts the development of electric vehicles.

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