Active Current Balancing and Intelligent Voltage Balancing of Lithium-ion Batteries – White Paper from Huawei
Introduction:
This white paper from Huawei describes how, compared with lead acid batteries, lithium-ion batteries have many advantages, such as high
energy density, small size, light weight, many cycles, a long service life, and environment friendliness. Especially with the rapid development of electric vehicles and mobile phones, lithium-ion batteries are seeing wide commercial application, which drives down lithium-ion battery prices. A large number of data centres have begun to use lithium-ion batteries instead of traditional lead acid batteries, reducing the footprint and cost through the life cycle of data centres.
Although lithium-ion batteries have many advantages, challenges exist in actual application. This paper analyses and describes voltage balancing management of lithium-ion battery cells connected in series, intelligent voltage balancing of modules , and active current balancing for battery strings connected in parallel, and provides the corresponding solutions for reference.
This White Paper concludes:
After a large number of lithium-ion batteries are connected in series and then in parallel, problems of cell voltage and current balancing occur. This causes the bucket effect. The entire system's performance is determined by the worst cell. A consequence of this is reduced system capacity and reliability.
This paper first elaborates on the solution of cell balancing management in a string of batteries connected in series. The paper then describes the intelligent voltage balancing and active current balancing technologies. These technologies can greatly reduce the current imbalance and waste of redundant configurations. With the technologies, new and old battery strings can be connected in parallel, and even after a battery is removed, battery strings with different voltages can still be connected in parallel. In this way the reliability and availability of lithium-ion batteries is greatly improved.
White Paper from Huawei
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