What is the charging method of a common high voltage lithium ion battery?

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

What is a high-voltage lithium-ion battery? In life, you may have touched a wide range of electronic products, then you may not understand some of its components, such as high voltage lithium-ion batteries that it may contain, then next Let Xiaobian lead everyone to learn the charging method of high voltage lithium-ion battery. The lithium-ion battery has the advantages of high operating voltage, small size, light weight, no memory effect, no pollution, small discharge, long cycle life, is the ideal power supply. In actual use, in order to obtain a higher discharge voltage, at least two single-cell lithium ion batteries are typically connected in series to form a lithium ion battery pack.

At present, the lithium-ion battery pack has been widely used in the fields such as notebook computers, electric bicycles and spare power supplies. Currently, charging of lithium-ion battery packs is usually used in series charging, which is important because the series charge method is simple, low cost and easy execution. However, due to the difference in capacity, internal resistance, attenuation characteristics, self-discharge between single lithium ion batteries, when charging the lithium ion battery pack, the single lithium ion battery in the battery pack will be fully charged.

Electric, then other batteries have not been charged, if continued to charge the charging, the charged single lithium ion battery may be charged. In addition, although some battery management systems have equalization function, due to cost, heat dissipation, reliability, etc., the equalization current of the battery management system is often much smaller than the current charged, so the equalization effect is not very good.

Obviously, and there will be a case where some single batteries are not fully charged, which is more obvious about the lithium-ion battery pack (for example, the lithium ion battery pack of electric vehicles) to be large current. Excessive charging of lithium-ion batteries will seriously damage the performance of the battery, and may even cause the explosion to cause personal injury. Therefore, in order to prevent the excessive charging of a single lithium ion battery, the lithium-ion battery pack is usually equipped with a battery management system during use.

Management system prevents excessive charging per lithium ion battery. When charging, if the voltage of a single lithium ion battery reaches the charge protection voltage, the battery management system will cut the entire series charger and stop charging to prevent individual batteries from overcharge, resulting in other battery charging. Lithium-ion battery cannot be fully charged.

Typically, when the battery manufacturer is tested at the factory, the single battery is first charged with a constant current, and then charge it with a constant voltage, then discharged with a constant current to measure the discharge capacity. Typically, discharge capacity is approximately equal to constant current charging capacity plus constant voltage charging capacity. During the actual battery pack, the charging process is usually not a constant voltage charging process for a single battery, so the constant voltage charging capacity will be lost, and the battery pack capacity will be less than a single battery capacity.

Typically, the smaller the charging current, the smaller the constant pressure charging capacity ratio, the smaller the capacity loss of the battery pack. Therefore, a series charging mode coordinated by the battery management system and the charger has been developed. The battery management system is the most comprehensive device for the performance and state of the battery, so connect the battery management system and the charging machine to make the charging machine understand the battery information, thereby solving the charging of the battery more effectively.

Some problems. In this charging mode, not only can the management and control functions of the battery management system, but also change the output current according to the battery status, prevent all batteries from entering the charging state. Battery group over charge and optimize charging.

The actual discharge capacity of the battery pack is also greater than the ordinary series charge method, but this method still does not solve some of the problems in which some batteries in the battery pack, especially when the number of battery packs is large, the battery consistency is poor, charging Current relatively high. In order to solve some of the problems of certain monomer batteries in the battery pack, it has developed a combination of parallel charge. However, in parallel charged method, multiple low voltage, high-current charging power supply is charged for each single battery, high cost, low reliability, low charging efficiency, thick connecting line, etc.

, there is no big Range use this charging method. I believe that by reading the above content, everyone has a preliminary understanding of the charging method of high voltage lithium-ion batteries, and also I hope that everyone will summarize in the process of learning, so they can constantly improve their design level.

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