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1. Why the battery pack cannot be charged?

Could be divided into the following reasons: A.the charger is connected reversely or faulty B.The board protection is not restored or fails C.the battery pack and the electrical appliance are externally disconnected. Suggestions: check in turns, whether the charger is connected reversely, or the positive and negative plugs of the battery pack are connected reversely; re-enable the electrical appliances to release the protection board, measure whether the protection board MOS tube has driving voltage; check whether the wiring connection is loose or broken.

2. Why the battery pack cannot be discharged?

There are several reasons: A.the battery pack voltage is low, the protection board or the controller is protecting  B.the protection board or the controller is damaged C. the discharge positive and negative poles are reversed D.the circuit is disconnected or the switch is not turned on. To solve the above defects, you can solve the problems by charging the battery pack, checking the protection board or the line connection.

FAQS

3. Why the battery pack is not fully charged?

During the cycling process of the battery pack, charging stops before the overall cut-off voltage of the battery pack. This situation is due to the inconsistency of the battery capacity or capacity of a single string of the battery pack. The first fully charged string of the battery pack is protected by the protection board, so that battery of other strings are not fully charged when the charging process stops. Suggestions: In this case, the equalization charger can be used to recharge the battery pack to keep the voltage of each string consistent. If the capacity difference is huge, the battery must be replaced.

4.Why the temperature of battery pack is high?

When charging or discharging, the temperature of the battery pack is abnormally high and hot, it may be caused by the presence of high internal resistance batteries in the battery pack or the micro-short circuit of the battery pack, which causes the temperature of the battery pack to increase during charging and discharging. Suggestions: Long-term high temperature work of the battery pack is very dangerous. In this case, the bad battery cells must be replaced at once or the micro-short circuit must be repaired.

5. Why the battery pack suddenly stops working?

Reasons: A.the battery is discharged to a minimum voltage of the protection board or the controller, it stops working; B.the continuous working current is too large exceeding the design protection current of the protection board or the controller, it will cause the battery pack to suddenly stop working. Suggestion: by charging the battery pack or restarting the electrical appliances or re-adjusting the parameters to replace the protection board and the controller.

The working principle of lithium  ion battery

The Working Principle of Lithium-ion Battery

The charging and discharging process of lithium ion battery is the process of Li+ intercalation and deintercalation in the positive and negative materials accompanied by the absorption and release of energy. When charging a lithium-ion battery: Li+ is deintercalated from the positive electrode material, reaches the negative electrode through the electrolyte, and absorbs electrons and is embedded in the negative electrode material to form a higher energy intercalation compound. Lithium-ion battery is a kind of rechargeable battery, which mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes. when recharging the battery, Li+ deintercalates from the positive electrode and inserts into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; during discharge the opposite. Generally, batteries that use materials containing lithium as electrodes are representative of modern high-performance batteries. During the charging and discharging process, lithium ions are intercalated and deintercalated back and forth between the positive and negative electrodes, which is vividly called the "rocking chair battery". When charging the battery, lithium ions are generated on the positive electrode, and the generated lithium ions move to the negative electrode through the electrolyte. The carbon as the negative electrode has a layered structure which has many micro pores. The lithium ions reaching the negative electrode are embedded in the micro pores of the carbon layer. The more lithium ions are inserted, the higher the charging capacity. Similarly, when discharging the battery, the lithium ions embedded in the carbon layer of the negative electrode are released and move back to the positive electrode. The more lithium ions returned to the positive electrode, the higher the discharge capacity.

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