System for Activating Low Temperature and Emergency Treatment of High Temperature in New Energy Vehicle Batteries
In response to the current issues of low-temperature capacity attenuation and out-of-control fire at high temperatures in new energy batteries, our project has successfully developed a lithium battery control system that integrates low-temperature and high-efficiency discharge, as well as high-temperature emergency treatment. In low temperature environments, the system activates the lithium battery cell through a large current discharge module to achieve efficient discharge. This activation improves the discharge efficiency of the lithium battery in cold temperatures, allowing electric vehicles to maintain good endurance in cold areas. In high temperature environments, the system monitors the temperature and smoke concentration of the lithium battery in real time using temperature acquisition and smoke acquisition modules. If the lithium battery temperature is too high or if smoke concentration exceeds standard levels, the system will immediately activate a high temperature emergency module to quickly cut off power supply and isolate air. This prevents thermal runaway, fire, explosion, and other safety accidents. The system has been successfully tested in real cars and applied to retired batteries with positive results—improving their utilization rate. This achievement not only provides strong support for developing new energy electric vehicles but also offers an effective solution for mitigating extreme temperatures' impact on lithium battery performance. In terms of decommissioned batteries, this technology addresses accumulation problems by increasing their utilization rate—ultimately improving sustainable development within new energy battery technology.
New Industry And Energy
Energy storage systems
October 2024
People's Republic of China
The project has two major innovations, first, low temperature activation function, the team selected a large number of experimental samples in different temperature environments for more than 1000 discharge experiments, found that the battery capacity plummeted. When the temperature is lower than the set threshold, the battery is activated with high current for a short time to restore the battery activity, and the system can formulate different activation strategies. Taking -10℃ as an example, several different batteries were placed in -10℃, and the activation strategy was adopted. The maximum discharge capacity of the battery could reach 98.6% of the charging capacity, and the cyclic discharge experiment of the activated battery could reach about 1900 times. Second, the high temperature emergency function, in the high temperature environment when the temperature, voltage data is abnormal, the high temperature emergency function starts quickly, immediately cut off the power before the battery thermal runaway, isolate the air, and prevent combustion. First, through multi-algorithm fusion intelligent optimization, dynamic formulation of optimal activation strategy, enhanced low-temperature endurance. Second, the high temperature response is sensitive, before the battery occurs thermal runaway, the main control module makes a comprehensive analysis and judgment to make a decision, start the high temperature emergency function, to avoid the battery thermal runaway.
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