Unlike large automakers who use hundreds of large battery cellsin electric vehicles, Tesla uses thousands of small battery cells. This type of battery cell is the same as a large battery cell, and it is necessary to prevent it from getting hot due to energy input and output. Tesla electric car batteries also have some overheating problems, but the problem is not big.
But it does not mean that Tesla has not tried to improve its battery pack. According to foreign media reports, last week, the U.S. Patent & Trademark Office (U.S. Patent & Trademark Office) announced that Tesla had submitted a patent application called "High Voltage Electrolysis of Coolantina Battery Pack" (High Voltage Electrolysis of Coolantina Battery Pack).
The battery cooling patent describes a new type of cooling system that uses a coolant solution containing two different liquids. The two liquids are mixed together to form a new liquid, and then as the preset ratio of liquid mixing changes, the mixed liquid will have different boiling points. The sensor of the cooling system monitors the high-voltage electrolysis of the battery module and can automatically repair it to reduce possible risks during high-voltage electrolysis. The purpose of the patent is to limit the possible overheating conditions of a single battery cell and battery module.
The patent application states that once the overheating reaction starts, overheating will spread in the entire battery pack or part of the battery pack until the overheated battery is sufficiently cooled, otherwise the entire battery pack or part of the battery pack will be exhausted. However, the battery must be heated to 200 degrees Celsius to release energy. Although the risk of overheating of the battery caused by high-voltage electrolysis is great, another risk, that is, the chemical reaction of electrolysis, will also appear in the presence of hydrogen. Under certain conditions, the hydrogen released during the electrolysis process will accumulate inside the battery pack, posing a threat.
The conventional solution to the above problems is to allow the high-voltage electrolysis to continue once the passengers and passers-by leave the vehicle, because it is difficult to safely stop the battery high-voltage electrolysis. Therefore, it is necessary to have a device and method for detecting and responding to the high-voltage electrolysis in the battery of an electric vehicle to limit the overheating of each battery cell and module.
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