General FAQs for lithium-ion-battery(1)
What is the advantage of secondary lithium battery?
1, high energy density
2, high operating voltage
3, no memory effect
4, long cycle life
5, no pollution
6, light weight
7, self-discharge small
What are the advantages of lithium polymer batteries?
1, no battery leakage problem, the battery does not contain liquid electrolyte inside, the use of colloidal solid.
2, can be made thin battery: 3.6V400mAh capacity, the thickness can be thin to 0.5mm.
3, the battery can be designed into a variety of shapes
4, the battery can be bent deformation: polymer battery can be bent up to 900 or so
5, can be made into a single high voltage: liquid electrolyte battery can only be a few batteries in series to get high voltage, polymer batteries because of their own liquid, can be made within a single multi-layer combination to achieve high voltage.
6, the capacity will be higher than the same size lithium-ion battery doubled
IEC standard lithium battery standard cycle life test is:
The battery to 0.2C after the 3.0V / support
1,1C constant current constant voltage charge to 4.2V cut-off current 20mA for 1 hour and then to 0.2C discharge to 3.0V (a cycle)
Repeated 500 times after the capacity should be more than 60% of the initial capacity
The national standard specifies that the standard charge monitoring of lithium batteries is (IEC no relevant standard).
The battery at 25 degrees Celsius conditions to 0.2C to 3.0 / support, to 1C constant current constant voltage charge to 4.2V, cut-off current 10mA, at a temperature of 20 + _5
Stored for 28 days, then 0.2C discharge to 2.75V to calculate the discharge capacity
What is the self-discharge of secondary batteries What is the self-discharge rate of different types of batteries?
Self-discharge, also known as charge retention capacity, it refers to the open circuit, the battery storage power in a certain environmental conditions to maintain capacity. In general, self-discharge is mainly affected by manufacturing processes, materials, storage conditions, self-discharge is a measure of battery performance, one of the main parameters. In general, the lower the battery storage temperature, the lower the self-discharge rate, but also should pay attention to the temperature is too low or too high may cause damage to the battery can not be used, BYD conventional battery requirements storage temperature range of -20 ~ 45. The battery is fully charged open for some time, a certain degree of self-discharge is a normal phenomenon. IEC standard provides nickel-cadmium and nickel-metal hydride batteries are fully charged, the temperature of 20 degrees humidity of 65% conditions, open for 28 days, 0.2C discharge time of more than 3 hours and 3 hours and 15 minutes is the standard.
Compared with other rechargeable battery systems, the self-discharge rate of liquid electrolytes containing solar cells is significantly lower, about 10% per month at 25 months.