Lithium ion Battery Heat Control in Tesla Electric Car

- Sep 16, 2018-

Lithium ion Battery Heat Control in Tesla Electric Car


Abstract: 

a device and method is needed to detect and respond to the high voltage electrolysis in the battery of an electric vehicle to limit the overheating of each cell and module.


Unlike the big carmakers, which use hundreds of large cells in electric vehicles, tesla USES thousands of small cells. This kind of battery cell, like large battery cell, because energy input and output, need to avoid burning. Tesla's electric battery has some overheating problems, but not much.



But that doesn't mean tesla isn't trying to improve its battery pack. Last week, U. S. The Patent & Trademark Office has published a Patent application filed by tesla called High Voltage Electrolysis of Coolant in a Battery Pack.



The battery cooling patent describes a new cooling system that USES a coolant solution containing two different liquids. The two liquids mix together to form a new liquid, which then has different boiling points as the preset ratio of the liquid mixture changes. The sensor of the cooling system monitors the high voltage electrolysis of the battery module and can be automatically repaired to reduce the risk of high voltage electrolysis. The purpose of the patent is to limit the possible overheating of a single battery cell and battery module.



Once the reaction begins, the overheating can spread through the entire battery pack or part of the battery pack until the superheated battery cools sufficiently, otherwise the entire battery pack or part of the battery pack will be exhausted, the patent application said. However, the battery must be heated to 200 degrees Celsius to release energy. While high pressure electrolysis poses a high risk of overheating, the other risk is that hydrogen can be produced by electrolytic chemical reactions. Under some conditions, the hydrogen gas released by the electrolysis can accumulate in the battery pack, posing a threat.



The conventional solution to this problem is to allow high voltage electrolysis to continue as soon as passengers and passengers leave the vehicle, because it is difficult to stop the battery safely. Therefore, it is necessary to have a device and method to detect and respond to the high voltage electrolysis in electric vehicle batteries to limit the overheating of each cell and module.