How important is the battery management system -Lithium - Ion Battery Equipment

How important is the battery management system? -Lithium - Ion Battery Equipment

On July 16, the State Administration of Market Supervision disclosed the recall information, which showed that Great Wall Motors had filed a recall plan with the State Administration of Market Supervision and Administration in accordance with the requirements of the Administrative Regulations on the Recall of Defective Automobile Products and the Implementation Measures of the Administrative Regulations on the Recall of Defective Automobile Products. It is decided to recall 16216 Great Wall Oula IQ electric vehicles produced from July 7, 2018 to October 30, 2019 from July 16, 2021.

It is reported that the consistency of some power batteries carried by Great Wall Oula IQ electric vehicles within the scope of this recall of Great Wall Motors is different from that of BMS software control strategy. After long-term continuous and frequent fast charging, the battery performance will decline. In extreme cases, thermal runaway of the power battery may occur, with potential safety hazards.

Great Wall Motors said that it would test the power batteries of vehicles within the recall scope for free, and write the control strategy software adapted to the working conditions, and replace the battery module when necessary to eliminate potential safety hazards.

Importance of BMS

According to the Battery Alliance, many new energy vehicles catch fire or have trouble with BMS, which fully demonstrates its great role.

BMS is a set of control system to protect the safety of the use of power battery. It monitors the use status of the battery at all times, alleviates the inconsistency of the battery pack through necessary measures, and provides security for the use of new energy vehicles. Its key role is to enhance the utilization efficiency of the battery, eliminate excessive charging and discharging of the battery, increase the service life of the battery, and supervise the battery status. The BMS industrial chain includes four links: upstream and midstream raw materials, BMS modules, BMS finished products, and downstream applications.(Lithium - Ion Battery Equipment)

As an important link between on-board power battery and electric vehicle, the battery management system (BMS) solves the key problems of safety, availability, ease of use, service life, etc. in the battery system by collecting, processing and storing important information during the operation of the battery pack in real time and exchanging information with external equipment.

The main function of BMS is to monitor various parameters in the battery pack, including cell voltage, current, temperature, system insulation, pressure, abnormal gas, etc. The electric vehicle fire and other accidents are caused by the abnormal battery state. Overcharging and overdischarging will cause damage to the lithium-ion battery pack, even more serious accidents. In addition to the routine monitoring of voltage and current, if the abnormal changes of the environment can be predicted in advance, the accident can be avoided. From this perspective, BMS has a lot of room for optimization and can be more intelligent.

When the electric core is abnormal, it often shows the state of heating, undervoltage, abnormal gas, etc. In 2020, the Ministry of Industry and Information Technology will organize the formulation of GB38031-2020 Safety Requirements for Power Batteries for Electric Vehicles, which will be issued as a mandatory national standard. The standard adds the thermal diffusion test of the battery system, which requires that the battery system will not fire or explode within 5 minutes after the thermal runaway of the single battery occurs, so as to reserve safe escape time for passengers. The intelligent BMS can judge the environment inside the bag through the air pressure sensor, temperature sensor and abnormal gas sensor, and how to accurately calculate the battery pack status through the detection of the environmental parameters inside the bag combined with the cell parameters will guide the direction of BMS technology innovation. The accuracy of the final calculation results depends on the accuracy of various data detected, so the quality and reliability of these sensors and analog front-end chips will be the most important guarantee.

There are mainly three types of enterprises in China's BMS market: one is third-party BMS manufacturers, such as Yineng Electronics, Guantuo Power Supply and Li Hi Tech Energy; The second category is battery module and PACK packaging enterprises, such as Guoxuan High Tech and Xinwangda; The third category is vehicle manufacturers, such as BYD and BAIC New Energy



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