Are battery capacity and rated capacity the same?


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When customers are customising batteries, we usually ask how large capacity needs to be made, this is provided according to the customer’s own products, not arbitrarily formulated by us. While the rated capacity needs to be designed by engineers according to the capacity to achieve the maximum discharge current value. The reason why many customers do not know the battery capacity and rated capacity, because they are two different concepts, simply put, the battery capacity is the voltage, the rated capacity is the current.

Battery Capacity

Battery capacity refers to the size of the battery storage capacity. It is one of the important performance indicators to measure the performance of the battery, which indicates that under certain conditions (discharge rate, temperature, termination voltage, etc.) the amount of electricity discharged from the battery (available -150D to do the discharge test), that is, the capacity of the battery, usually in Ampere/hour unit (referred to as, expressed in AH, 1Ah = 3600C). Battery capacity C is calculated as C = ∫t0It1dt (integrating the current I from t0 to t1), and the battery is divided into positive and negative poles.

Rated Capacity

The unit of rated capacity is “mAh”, 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. It is the capacity of the motor or electrical appliance indicated on the nameplate that can continue to work for a long time under the rated operating conditions. Usually for the transformer refers to the apparent power, for the motor refers to the active power, for the phase control equipment refers to the apparent power or reactive power, the unit is VA, kVA, MVA.

The difference between lithium battery capacity and rated capacity

Lithium battery capacity is usually divided into rated capacity, actual capacity and theoretical capacity. Lithium 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 lithium-ion battery capacity and reduce the battery size. Lithium battery capacity, is a very critical indicator in lithium-ion applications, and the commonly used methods for calculating and evaluating the capacity of lithium batteries include chemical method, voltage method, current integral method, etc.

The capacity of lithium battery is divided into rated capacity and actual capacity. The rated capacity of the battery refers to the amount of electricity that should be supplied when the battery is discharged to the termination voltage at a rate of 5h under the condition of ambient temperature of 20℃±5℃, which is expressed by C5. The actual capacity of the battery refers to the actual amount of electricity discharged by the battery under certain discharge conditions, which is importantly affected by the discharge rate and temperature.

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