-How to ensure the ultimate safety of electric vehicle batteries (5)

How to ensure the ultimate safety of electric vehicle batteries (5)
author:enerbyte source:本站 click261 Release date: 2023-06-01 09:00:54
abstract:
The design of a battery pack failure safety system based on the bMS security protection strategy allows the Leaf to clarify the safety boundary of battery usage and provide real-time alarms during use, thereby preventing thermal runaway and serving as a failure protection function....

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The design of a battery pack failure safety system based on the bMS security protection strategy allows the Leaf to clarify the safety boundary of battery usage and provide real-time alarms during use, thereby preventing thermal runaway and serving as a failure protection function.

According to Ouyang Minggao's team's research on the causes of thermal runaway in power lithium-ion batteries, one is internal short circuits caused by various reasons such as mechanical deformation, compression, tearing, diaphragm breakage, and extreme overheating. This requires the thermal safety design of individual batteries from the perspective of the safety of the system itself and the material system mentioned above. The second is lithium evolution caused by overcharging, fast charging, aging batteries, low-temperature charging, etc. For the latter, relevant charging algorithms need to be improved and optimized.

In terms of charging algorithm, Nissan Leaf has also done a lot of data accumulation and experimentation, as explained by Ouyang Minggao. His team and Nissan have collaborated on the charging algorithm, which is based on a large amount of data MAp diagrams. Supported by a large amount of experimental data, the charging algorithm can consider various influencing factors, which makes it wary of many thermal runaway problems.

Gaogong Lithium Battery has learned that the charging safety management of Nissan Leaf is also set up in the bMS system. With sufficient understanding and support from a large number of detection results, the charging current and voltage boundaries can be clearly defined to control the entire charging process and ensure charging safety.

To ultimately achieve the safety of electric vehicles, it is not enough to rely solely on investment in product development and design, and it is necessary to do a good job in the processing and manufacturing process.

A set of data for reference is that, according to the analysis of the State Administration for Market Regulation, as of May 2019, a total of 123000 new energy vehicles were recalled in China. Among them, 50% of recalls are caused by malfunctions in the three electrical systems, with design reasons accounting for 40% and processing and manufacturing reasons accounting for 60%.

No matter how well the product is designed, stable and high-quality processing is another matter. This requires core component companies to have high engineering capabilities, which refer to processing manufacturing and quality systems.

Regarding the processing of power lithium-ion batteries, which are the heart of electric vehicles, Gaogong Lithium conducted in-depth research with Nissan Leaf's power lithium-ion battery supplier, Vision AESC, to understand how to achieve safety control in processing, manufacturing, and quality system establishment.

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