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Do You Know These Battery Performance Terms? (Two)
- Jul 19, 2018 -

6. What is the rate of (charge and discharge)? Time rate?


It is the current value required by the battery to release its rated capacity within a specified time, which is equal to the number of the rated capacity of the battery, usually represented by the letter C. If the nominal capacity of the battery is 600mAh, then 600mAh is 1C (1 times), 300mA is 0.5C, 6A (6000mA) is 10C, and so on.

The N rate, also known as the hourly rate, refers to the number of hours required for a battery to discharge its rated capacity at a certain current. If the rated capacity of the battery is 600mAh, it will take 1 hours to discharge the rated capacity with 600mA current, so the current of 600mA is 1 hours, and so on.


7. What is the rate of self discharge?

Also known as the power holding capacity, refers to the battery in open state, the battery stored capacity under certain conditions to maintain capacity. It is mainly affected by the manufacturing process, materials and storage conditions of the battery. It is an important parameter to measure the performance of a battery.

Note: battery 100% is full of electrical discharge, and a certain degree of self discharge is normal. When the GB standard stipulates Li-ion, the open circuit for 28 days at 20 + 2 degrees can allow some capacity loss of the battery.


8. What is overcharge? What are the bad consequences of overcharging? How do you avoid it?

In theory, the Li-ion battery is charged at a constant constant current and constant pressure. When the charge is converted to a constant voltage 4.02V charge, the current of the charging circuit is 0.01C, the state of the constant voltage charge is still on, that is, it is considered as overcharge.

Overcharge may lead to leakage, deformation, fire, and a certain degree (general limit of 6.0V) after the constant voltage failure. It is one of the main causes of damage to the battery performance.

To protect the battery from the outside of the battery, or to set up a protective line and / or time limit device in the charger (the charge limit of 2.5 hours) to prevent the battery from overcharging can be prevented and protected.


9. What is it? What are the bad consequences of over - playing? How do you avoid it?

The battery has constant current discharge at a certain rate. When the battery voltage reaches 2.75V, the discharge state will continue, that is, over discharge.


Excessive discharge may lead to leakage, zero voltage and negative voltage, which is one of the main causes of damage to battery performance.


Add a PCB board outside the battery or design a protective circuit and / or time limit device in the charger to prevent over discharge.


10. What are the factors that cause the short circuit of the battery? What are the consequences? How to prevent?

The external conductor directly connects the positive and negative poles of the battery.

2) when the battery is assembled, the external impact force leads to internal (micro) short circuit.

3) the internal structure is bad (such as extremely acne, piercing the diaphragm and connecting the positive and negative poles).

If the battery is exposed to any metal conductor, it may lead to external short circuit. The external short circuit of the Li-ion battery may cause distortion, leakage, ignition and even explosion. Because the temperature of the internal electrolyte increases, the internal pressure rises, the increase of internal pressure will break the battery safety valve, if the failure of the safety valve will lead to the explosion.

So be careful not to store the rechargeable batteries in pockets with coins or key strings. Besides, avoid external impact (e.g. spot welding nickel strip, tin soldering, etc.), because external impact will lead to battery deformation and even internal electrode short circuit. Note: the distance between welding needles must be kept at 5-8mm during spot welding, and the bottom of battery should be welded.


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