Knowledge popularization of new energy vehicles and the role of battery management system

Under the trend of electrification, pure electric vehicles will usher in blowout growth, so the power battery as the driving source will become the key. Although lithium power battery is highly sought after by the industry for its high energy density advantage and excellent stability, "there are nine sons and nine sons, each with its own merits". Due to large-scale and automatic production, the power of single batteries will be slightly different when they leave the factory.

Moreover, with the long-term use, operation, aging and other factors, the inconsistency between batteries will become more and more obvious, affecting the efficiency and life of batteries, and even leading to spontaneous combustion and fire threatening the safety of life and property. At this time, BMS battery management system needs to be involved.

First, accurately estimate the remaining power of the battery pack, ensure that it is maintained within a reasonable range, and prevent excessive charging and discharging from damaging the battery; The second is to dynamically monitor the working state of the battery pack, and collect the voltage, current and temperature of the battery pack and the single battery in real time to prevent the battery from overcharge or overdischarge.

At the same time, it can also judge the state of the battery, pick out the defective battery, and maintain the reliability and efficiency of the whole battery operation. In addition, the use history file of each battery should be established to provide data for further optimization and development of new electric power, chargers and motors. , and provide a basis for off-line analysis of system faults; Finally, the balanced charging between batteries. We should know that the equalization technology is the key technology of a battery energy management system being developed internationally.

The battery management system currently installed in BYD products not only has the basic functions of battery energy management and battery thermal management, but also has the function of automatic battery balance.

During the running of the whole vehicle, the single performance parameters of the whole battery pack can be monitored, and the purpose of timely and automatic maintenance can be achieved through the battery balancing function, which greatly reduces the time cost of power battery maintenance, prolongs the service life of the battery and improves the performance of each stage.

Coupled with its own deep-rooted manufacturing experience in the field of lithium batteries and the technical control advantages of the whole industrial chain layout, BYD can better ensure the consistency of process quality and product performance in the large-scale and continuous automatic production process.

In addition, BYD has also matched its BMS battery management system with an advanced intelligent temperature control system for power batteries, so that the battery module can be freely adjusted through heating, cooling, heat preservation and other systems in high and low temperature environments, giving the battery stronger weather resistance and truly arming the power battery with teeth. Presumably, this is one of the reasons why BYD's new energy vehicles have been in the forefront in sales list and market share in recent years.