A discharge protection method for electric vehicles based on the highest voltage of a single cell
A technology with the highest voltage and electric vehicles, which is applied in the direction of electric vehicles, secondary battery charging/discharging, secondary battery repair/maintenance, etc., and can solve the problems of no effective monitoring of battery status, impact on battery safety and life, and inability to protect batteries, etc. problems, to achieve the effect of eliminating the danger of battery over-discharge
Active Publication Date: 2019-12-13
XIAN LINCHR NEW ENERGY TECH CO LTD
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Problems solved by technology
[0003] At present, when electric vehicles are discharged through the charging interface through the discharge equipment, the BMS does not provide information on the voltage of the battery cells to the discharge equipment, so the discharge equipment cannot perform traditional low-voltage protection on the power battery of the electric vehicle.
There is no effective monitoring of the state of the battery during the discharge process. This blind and extensive discharge cannot effectively protect the battery and will have a serious impact on the safety and life of the battery.
Method used
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Embodiment Construction
[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0036] like figure 1 As shown, when the discharge device discharges the electric vehicle, the discharge device obtains the message information of the battery management system BMS of the electric vehicle, and obtains the battery type and the maximum voltage value of the battery cell through analysis, as well as the maximum allowable discharge temperature, and the minimum allowable discharge temperature is The battery product parameters can be obtained from the product manual; the minimum allowable discharge temperature of different types of power batteries is set as follows:
[0037] Table 1 List of minimum allowable battery temperatures
[0038] Battery Type Lithium iron phosphate Ternary Lithium Lithium manganese oxide lithium titanate Minimum allowable temperature -20℃ -20℃ -20℃ -40℃
[0039] Embodiments, tak...
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The invention discloses a discharge protection method for electric vehicles based on the highest voltage of a single cell. During the battery discharge process, it is judged whether the current temperature of the battery is in the temperature range allowed for discharge, otherwise, the discharge is stopped, and if so, the current discharge rate of the battery is calculated. Determine the target discharge rate of the battery based on the current temperature and the current discharge rate of the battery, and calculate the highest voltage protection threshold V of the battery discharge cell according to the target discharge rate of the battery 1 , when the current highest voltage of the battery cell V max Less than or equal to the highest voltage protection threshold V of the battery discharge unit 1 end the discharge, or continue to discharge, the protection method of the present invention takes the highest voltage of the battery cell as the protection point, and considers the battery temperature, discharge rate and battery voltage difference range factors during discharge, and proposes the maximum voltage protection The calculation method of the threshold value protects the highest cell voltage of the battery, which can effectively prevent the danger of battery over-discharge.
Description
technical field [0001] The invention belongs to the technical field of electric vehicle discharge, and in particular relates to an electric vehicle discharge protection method based on the highest single voltage. Background technique [0002] The rapid development of electric vehicles has brought about major changes in the automotive industry, and has also brought a new operating model to the energy storage industry. Electric vehicles use the on-board power battery system as the energy source for vehicle power, which itself is a new form of energy storage—mobile energy storage. During the discharge process of electric vehicles, whether it will cause damage to personal safety, vehicle safety, and equipment safety is the focus of vehicle users and charging and discharging equipment operators. The discharge process of the power battery is a process in which chemical energy is converted into electrical energy. When an electric vehicle is discharged to the outside, it is necessa...
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IPC IPC(8): H01M10/42H01M10/44H01M10/48B60L58/10
CPCB60L58/21H01M10/425H01M10/446H01M10/448H01M10/486Y02E60/10Y02T10/70
Inventor 陈凤琴黄炎刘琪
Owner XIAN LINCHR NEW ENERGY TECH CO LTD