Lithium battery manufacturer
How to deal with the unbalanced voltage of wall mounted lithium battery pack
Time: Sep 26, 2022
1. Remove the protective plate of the lifepo4 powerwall lithium ion battery. To repair the unbalanced lithium-ion battery, first check the status of the lithium-ion battery and find the battery that affects the normal operation of the entire battery pack. It is required to bypass the battery protection board, directly measure the single lithium battery cell, and record;
2. Charge the battery with problems separately, or test the capacity separately, and check whether the capacity and internal resistance of the battery are significantly different from the whole battery pack. If the difference is small, you can charge the power wall battery separately. If the difference between capacity and internal resistance already exists, it can only be replaced.
3. The capacity of the home battery energy storage battery pack repaired after power supply or monomer replacement shall be divided before reassembly to check whether the capacity meets the design requirements;
4. Recycle the battery according to the original circuit, and install the battery protection plate and outer package;
Note: It should be noted that the wall mounted battery pack is usually unbalanced after being used for a period of time, so the internal resistance of the entire battery pack will be different from that of the new battery. Special treatment shall be carried out when replacing the monomer. The problem may reoccur quickly if the monomer is replaced directly;
1. First charge the entire powerwall 20 kwh lithium-ion battery pack, and then conduct floating charge within 2-3 hours after turning on the light. If the battery is not powered for a long time, it can be charged normally on the protection board for 10 minutes (socket charging), and then charged normally.
2. Pull out the circuit and plug of the protection board and mark them. The two wires on the board cannot be recovered. Measure the voltage of adjacent pins on the circuit. There are 16 voltages for 48V and 20 for 60V. The first set of negative voltages is the voltage that the battery pack becomes negative from the first line. Find a single string with a voltage below 3.50V, determine the positive and negative values, determine the negative values and mark them.
3. Use a 3.6V charger to charge a single wire at a voltage of 3.50V to 3.60V to 3.70V, but someone must always prevent the used lithium ion battery from being overcharged.
4. Insert the cables back in the original order, be careful not to reverse them, and put the battery into use. If the powerwall 20 kwh lithium-ion battery pack is used continuously, the capacity of the lithium-ion battery will naturally decrease. This is related to the material properties of lithium ion batteries, and also related to the material properties of lithium ion batteries. The simple understanding is that the activity of lithium ion battery continues to decline until the final capacity is completely reduced.
5. In order to prolong the service life of the lithium-ion battery pack, it is generally recommended to use the lithium-ion battery in the shallow charge and shallow discharge mode, or to charge the battery when too many lithium-ion batteries are not used or the power is insufficient. The life of lithium ion battery is not ideal.
The essence of capacity reduction and attenuation of lithium ion battery pack is the reduction of lithium ion content, which is mainly caused by the failure of structural materials or the deactivation of positive and negative electrode materials, electrolyte degradation, abuse of lithium ion battery, etc. In order to prolong the life of lithium ion battery, it must be used correctly

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