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What is the C-rate that lithium batteries can be discharged?

What is the C-rate that lithium batteries can be discharged?

Editorial:EVA Issue Date:2020-01-27 Views:632

Normally, applications that require high-rate discharge are racing or industrial applications that need to provide powerful energy to start equipment in a short period of time, like RC model, Agricultural drones, formula racing cars, elevators, and the vehicle jump starter battery all require high discharge rate batteries.

The C-rate represents the rate at which level the battery is providing energy. The higher power with a higher discharge rate (C-rate). 1C means that the battery is fully charged and discharged within one hour, 2C is 30 minutes, and so on 10C=6mins, 100C=6 seconds. Most jump starters on the market are around 30C or 35C rate discharge. Is there a higher one? In the field of racing models, there are quite a lot of high discharge rate batteries that continuously discharge 30C to 50C, and many batteries will be marked with 75C or even 100C rate discharge, which may refer to "Max. pulse discharge rate", which is discharge reaches this rate within a few seconds. To provide a driving force for the model. However, most applications do not need to use such a high rate of discharge. Our commonly used devices only have a discharge rate with around 1C at the highest. Normally, the IEC (International Electrotechnical Commission) standard of lithium battery discharge rate is 1C. For example, the discharge current of a 7.2V electric cordless drill is 500mA (0.5A), the battery capacity is 3500mAh (3.5Ah), so the C-rate (discharge rate) is 0.5A/3.5Ah=0.14C, it means the drill can use around 7 hours.

7.2V electric cordless drill

7.2V electric cordless drill[/caption] Generally, the discharge rate of mobile phone batteries is 0.2C, if the battery is 5,000mAh (5Ah), the discharge current is 0.2C*5Ah=1Ah, that means the battery be discharged 1,000mAh per hour and could operate around 5 hours. In the case of only considering the C-rate, continuous discharge exceeding 5C is already a high rate. As far as I know, under the condition of pulse discharge, the lithium battery can discharge up to a rate of 150C. Regarding high discharge rate batteries, you can learn about Grepow high discharge rate lithium battery series, including LiPo and LiFePO4 batteries, just click here.

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