The difference between lithium battery capacity and battery rated capacity. What is the difference between lithium battery capacity and rated capacity? Battery capacity refers to the size of the power stored in the battery. The unit of rated capacity is "mAh", and the rated capacity refers to the capacity that the battery can reach after the design and the influence of the battery manufacturing process, which is called the rated capacity.
The difference between lithium battery capacity and rated capacity
Capacity is an important indicator of the battery's electrical performance. Li-ion battery capacity is usually divided into rated capacity, actual capacity and theoretical capacity. Li-ion battery capacity is determined by the capacity of the electrode, especially the cathode material. By improving the performance of the cathode material can greatly increase the capacity of Li-ion battery and reduce the size of the battery. Li-ion battery capacity, is a very critical indicator of lithium-ion applications, currently the commonly used methods for calculating and evaluating the capacity of lithium batteries are chemical method, voltage method, current integration method, etc.
Battery capacity.
Is one of the important performance indicators to measure the performance of the battery, it indicates that under certain conditions (discharge rate, temperature, termination voltage, etc.) the battery discharge power (available JS-150D to do discharge test), that is, the battery capacity, usually in ampere-hour units (abbreviated, expressed as A-H, 1A-h = 3600C).
Battery capacity is divided into actual capacity, theoretical capacity and rated capacity according to different conditions. The formula for calculating battery capacity C is C=∫t0It1dt (integration of current I in the time from t0 to t1), and the battery is divided into positive and negative poles. Battery capacity is generally calculated in AH (ampere-hours), and the other is calculated in CELL (unit pole plate) several watts (W).
Rated capacity.
Is the capacity of the motor or appliance indicated on the nameplate that can continue to work for a long time under rated operating conditions. Usually for transformers refers to the apparent power, for motors refers to the active power, for phase regulation equipment refers to the apparent power or reactive power, the unit is VA, kVA, MVA.
Actual capacity of the battery.
Reflects the size of the actual battery storage power, the unit expressed in Ah ampere-hours. The greater the Ah, the greater the battery capacity and the longer the range of the electric vehicle. In the process of use, the actual capacity of the battery will gradually decay. The national standard stipulates that the actual capacity of the new battery is greater than the rated capacity value for qualified batteries. For example, the battery of electric bicycle in the market is discharged with constant current 5A for more than 2 hours (120 minutes), which is greater than (2 hours × 5A) 10Ah. It is equivalent to the electric car driving continuously for more than 2 hours on a flat road.
What does the capacity of lithium battery include?
1, Nominal capacity
Lithium battery in different discharge system gives different power, in this unmarked discharge system battery actual capacity is called nominal capacity.
2, rated capacity
In the design and production of batteries, lithium batteries are specified in a certain discharge conditions should be discharged under the minimum power.
3, Theoretical capacity
The capacity when the active material is assumed to be 100% utilized.
4, Design capacity
The capacity value used in the design of lithium batteries, taking into account various influencing factors. The design capacity is generally larger than the rated capacity.
5、Actual capacity
The actual output capacity of a lithium battery under specified conditions.
Summary: The capacity of lithium battery has rated capacity and actual capacity. The rated capacity of the battery refers to the power that should be provided when the battery is discharged to the termination voltage at an ambient temperature of 20℃±5℃ at a rate of 5h, expressed as C5. The actual capacity of the battery refers to the actual power discharged by the battery under certain discharge conditions, which is mainly affected by the discharge rate and temperature.
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