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The working principle of several lithium energy transfer battery balancer circuits

(Summary description)The development of new energy and the development of electric vehicles will use lithium batteries with a higher energy density ratio. In the process of using lithium batteries in series, in order to ensure the consistency of battery voltage, a energy transfer battery balancer voltage equalization circuit will inevitably be used.

The working principle of several lithium energy transfer battery balancer circuits

(Summary description)The development of new energy and the development of electric vehicles will use lithium batteries with a higher energy density ratio. In the process of using lithium batteries in series, in order to ensure the consistency of battery voltage, a energy transfer battery balancer voltage equalization circuit will inevitably be used.

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The development of new energy and the development of electric vehicles will use lithium batteries with a higher energy density ratio. In the process of using lithium batteries in series, in order to ensure the consistency of battery voltage, a energy transfer battery balancer voltage equalization circuit will inevitably be used. In the work process of the past few years, I have used several kinds of battery equalization circuits, and I will share with you here. With the increase in the use of lithium batteries, the protection, battery management and balance of multiple series-connected large-capacity lithium batteries will definitely be developed. I hope that some small things I have done can be helpful to everyone.
  energy transfer battery balancer
The energy transfer battery balancer balancing circuit is load consumption balancing, that is, a resistor is connected in parallel to each battery, and a switch is connected in series for control. When the voltage of a battery is too high, the switch is turned on and the charging current is shunted through the resistor, so that the voltage is high. The charging current of the battery is small, and the charging current of the low-voltage battery is large. In this way, the battery voltage is balanced, but this method can only be applied to small-capacity batteries, which is unrealistic for large-capacity batteries. I have not experimented with the energy transfer battery balancer equalization method, which is the fit capacitor method. To put it simply, each battery has a capacitor in parallel. This capacitor can be connected in parallel to its own battery or adjacent batteries by switching. When the voltage of a certain battery is too high, first connect the capacitor in parallel with the battery, the capacitor voltage is consistent with the battery, and then the capacitor is switched to the adjacent battery, and the capacitor discharges the battery. Realize the transfer of energy. Since capacitors do not consume energy, lossless energy transfer can be achieved. But this method is too cumbersome. Today's power batteries can't move dozens of sections in series. If this method is used, how many switches are needed to control it.

To balance is to charge a power battery pack. Two groups with a battery capacity of 80ah are connected in parallel, and the balance current is required to be 10a. The principle of balance that I have previously understood is not enough. Such a large current is equivalent to a small one. Module, it is really engaged in n small modules in series, each battery in parallel with a small module, if the voltage of the single battery is lower than the set value, start the corresponding parallel module, start charging the low-voltage battery, supplement the energy boost Voltage to achieve balance.
  
  energy transfer battery balancer DC-DC input bus can be either battery voltage or DC input provided by other modules. Flexible configuration according to needs.

The active balancing method of the energy transfer battery balancer can use the multiple output method of a transformer. If you want to use the following circuit diagram to make a multi-output flyback power supply, use the output voltage of each module to balance the battery. It is estimated that you need deep skills, because the cross-adjustment rate is estimated to kill you. However, using this circuit, we can change our thinking, each output does not need to be regulated. Of course, in order to prevent the open circuit from damaging the output capacitor, we can do a simple primary side feedback. Then connect an electronic switch in series between each output and the battery. Since this balance works with the battery management system, each output only needs to be connected in series with an electronic switch, which can be controlled by the management unit. You can turn on this electronic switch, and there will be power output to charge the battery until the voltage of all single cells reaches our expected value. 
 

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