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Selection of Lithium-ion Battery Types and Capacities

First of all, we need to calculate the continuous current required by the battery according to the power of our motor. (Regarding exercise power, generally, the cycling speed corresponds to the corresponding exercise power.) For example, if the motor continuously operates at 20 (a 1000W motor at 48V), the battery should be able to supply a current of 20 for a very long period with a very low temperature rise. (Even if the outside temperature is 35 degrees Celsius in summer, the battery temperature should be controlled within 50 degrees Celsius.) Additionally, if the current at 48V is 20A, the overvoltage should be doubled (96V, such as in ecpulevel3), and the current should continue to be maintained at around 50A. If you prefer to use it with overvoltage for a long period, please select a battery that can continuously supply a current of 50A (or pay attention to the temperature rise issue). Here, the battery operates continuously with the current, rather than the battery's nominal discharge capacity by the manufacturer. The business-nominal several C (or tens or hundreds of amperes) refers to the battery's discharge capacity. When discharging power at such a current, the battery heats up easily. If the heat dissipation is not properly done, the battery's lifespan will be very short. (Moreover, the environment in which the batteries are used in our electric vehicles is that the battery stacks are discharged without any gaps, and the packaging is very tight, not to mention how to implement forced air cooling.) Our operating environment is really bad. The discharge current of the battery should be reduced. To evaluate the battery's discharge current capacity, we need to see how much the temperature rise of the current corresponding to the current battery is.

The only principle discussed here is the temperature rise of the battery during its use. (High temperature is the mortal enemy of the lifespan of lithium-ion batteries.) The battery temperature had better be controlled below 50 degrees Celsius. (Preferably between 20 and 30 degrees Celsius.) This also means that if it is a capacitive lithium-ion battery (controlled to discharge at 0.5C), the supply of a continuous discharge current of 20A should require a capacity greater than 40Ah. (Of course, the most important thing is to look at the internal resistance of the battery.) If it is a power-type lithium battery, discharging at 1C is normal. Even for the A123 ultra-low internal resistance power-type lithium-ion battery, it is usually best to discharge at 1C (it is even better not to exceed 2C. Discharging at 2C can only run for half an hour before the power is cut off, which has no great practical value). Factors such as the capacity selection for cars, the size of the storage space, personal budget, and the desired range of activities of the car should also be considered. (Generally, power lithium-ion batteries tend to have a relatively small capacity.)

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