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How does overcharge of lithium ion battery pack affect battery performance?

by:UFO      2020-01-08

How does overcharging of lithium ion battery pack affect battery performance? What are the possible reasons for the short discharge time of the battery pack? What problems will arise when lithium batteries of different capacities are combined? What are the basic and safety characteristics of lithium ion batteries?

1

1. What problems will occur when batteries of different capacities are used together?

if different capacities or new and old batteries are mixed together, liquid leakage and zero voltage may occur. This is because during the charging process, the capacity difference causes some batteries to be overcharged during charging, some batteries are not fully charged, and when discharging, the batteries with high capacity are not fully discharged, the low capacity is over-released. Such a vicious circle, the battery is damaged and leaks or low (Zero)Pressure causes potential safety hazards.

II. Basic characteristics of lithium ion batteries?

1. High energy density: the weight of a lithium ion battery is half that of a nickel-cadmium or nickel-hydrogen battery with the same capacity, and the volume is 20-30%, Nickel hydrogen 40-50%.

2. High voltage: the working voltage of a lithium ion battery monomer is 3. 7V (Average) , Equivalent to three nickel-cadmium or nickel-hydrogen batteries in series.

3. No pollution (Environmental protection) Lithium ion batteries do not contain heavy metal elements such as cadmium, lead, mercury, etc.

Three, lithium battery pack stored in what kind of conditions better?

According to the IEC standard, the battery Capital believes that the lithium battery pack should be at a temperature of 205℃, humidity RH (65 ±Natural 20)% Of the storage conditions. Generally speaking, the higher the storage temperature of the battery, the lower the residual rate of the capacity. On the contrary, it is the same. The refrigerator temperature is 0-A good place to store batteries at 10 °c. In particular, the requirements for primary batteries are more stringent, and even if the secondary battery loses its capacity after storage, the capacity can be restored as long as it is recharged and discharged several times.

4. What are the possible reasons for the short discharge time of the battery pack?

1. The battery is not fully charged, such as insufficient charging time and low charging efficiency;

2. If the discharge current is too large, the discharge efficiency will be reduced and the discharge time will be shortened;

3. When the battery is discharged, the ambient temperature is too low and the discharge efficiency decreases.

5. What is the effect of overcharging on battery performance?

overcharging refers to the behavior that the battery continues to charge after it is fully charged in a certain charging process, such as Ni- CD battery, overcharging produces the following reaction: positive electrode: 4OH-- 4e2H2O O2 negative electrode: 2Cd O22CdO due to the design, the negative electrode capacity is higher than the positive electrode capacity. Therefore, the oxygen generated by the positive electrode is compounded with the cadmium generated by the negative electrode through the diaphragm paper. Therefore, under normal circumstances, the battery should fully avoid overcharging. China battery network suggests that lithium battery packs need to be equipped with protection boards, and the battery protection boards should have overcharge and overdischarge functions.

6. Safety characteristics of lithium ion batteries?

lithium ion batteries have been widely used in people's daily life, so its safety performance should definitely be the first evaluation index of lithium ion batteries. For the safety performance evaluation index of lithium ion batteries, very strict standards have been set internationally. Lithium ion batteries do not have any fatal defects in safety performance.


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