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SUNRA Corporation has applied for a zero voltage charging method and system patent for sodium ion batteries, reducing the maintenance cost of sodium ion batteries

Article Source：China National Intellectual Property Administration | Author：Financial Sector | Issuing Time：2024.03.27
On March 27, 2024, the financial sector reported that, according to the announcement of the China National Intellectual Property Administration, Jiangsu SUNRA Electric Vehicle Co., Ltd. applied for a patent entitled "a zero voltage charging method and system for sodium ion batteries", with the publication number of CN117755151A and the application date of December 2023.



The patent abstract shows that the invention relates to the technical field of sodium ion batteries, in particular to a zero voltage charging method and system for sodium ion batteries, which includes a charger and a battery, and the battery includes a BMS system and battery cells; Connect the charger to the battery to charge it, and determine whether the battery cell is lower than a single string of 1.1V based on battery communication; If it is lower than a single string of 1.1V, the charger supplies power to the BMS system of the battery and charges the battery cells with low current; If it is higher than a single string of 1.1V, the charger charges the battery cells. The present invention adds an additional set of+3.3V/5V charging secondary circuits to the charger, and detects the battery during the charging process to determine whether it is in a low power state; If the sodium ion battery is detected to be in a low charge state, first power the BMS to open the charging MOS of the BMS, then charge the battery with a small current. When it reaches the normal voltage, it returns to normal charging. The present invention reduces the maintenance cost of nanoion batteries and reduces the probability of them being unusable due to battery feeding.
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