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Can lithium batteries in electric vehicles be charged quickly – Semco UNiversity

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Introduction

The difference between fast charging and slow charging of lithium batteries. In this article, we will read about – How Can Lithium Batteries in Electric Vehicles be Charged Quickly.

Now a‐days, many electric vehicles are equipped with lithium batteries, and there are basically two ways to charge the battery, fast charging and slow charging. The speed of lithium battery charging in electric vehicles is closely related to the power of the charger, battery charging characteristics and temperature.

There are different types of lithium batteries in electric vehicles, generally lithium iron phosphate batteries and ternary lithium batteries. The former is suitable for slow charging and the latter is suitable for fast charging. It depends on the manufacturer’s charging strategy for lithium batteries which will be set inside its charger and cannot be changed. Each lithium battery manufacturer will configure slow charging and fast charging ports according to the characteristics of lithium batteries, and the BMS system will uniformly manage the charging process. As long as it is charged according to the requirements of the manufacturer, it is safe.

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Generally speaking, lithium batteries in electric vehicles cannot be quickly charged outside. If the roadside fast charging station is pulsed, it will cause damage to the protective plate of the lithium battery of electric vehicles, and it is also easy to cause the wrong action of the protective plate. If the lithium battery protective plate is broken, it will also cause a big problem. Lithium batteries are different from the chemical composition of lead-acid batteries. Lithium batteries need constant voltage and constant current two-stage charging.

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The charge and discharge magnification of lithium batteries refers to the charging and discharging current per unit rated capacity. For example, when a battery with a rated capacity of 100Ah is charged and discharged with 20A, its charge and discharge magnification is 0.2C. Generally, the charging current of lithium batteries is set between 0.2C and 1C. The high‐ er the current, the faster the charging, but the more serious the battery heats

While saving charging time, the lithium battery fast charging of electric vehicles will also cause great damage to the lithium battery itself. Due to polarization in the battery, the maximum charging current it can accept will decrease as the charging and discharging cycle increases. According to the analysis of lithium battery manufacturers of electric vehicles, a series of problems such as electrolyte reaction decomposition and gas production, the risk coefficient suddenly increases, which will affect the safety of lithium batteries, and the life of non-power batteries will inevitably be greatly shortened.

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Conclusion

Lithium battery chargers can be made according to charging requirements, but whether lithium batteries can be charged quickly depends on whether lithium battery manufacturers allow them, because some lithium batteries are not allowed to charge quickly. Therefore, it is best to ask clearly first, and it is best to seek guidance from the original factory technicians to avoid safety problems.

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