A charging overcharging protection method and system for an electric vehicle
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A technology of overcharge protection and electric vehicles, which is applied in the direction of electric vehicle charging technology, electric vehicles, charging stations, etc., and can solve the problems of spontaneous combustion of electric vehicles
Active Publication Date: 2021-09-10
HOZON NEW ENERGY AUTOMOBILE CO LTD
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[0004] However, even though there is an overcharge in the circuit design and a protection circuit in the overdischarge when the electric vehicle is charging, the spontaneous combustion of the electric vehicle occurs from time to time
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Embodiment 1
[0041] Such as figure 1 As shown, it is only one of the embodiments of the present invention, and the present invention provides a charging overcharge protection method for electric vehicles, comprising the following steps:
[0042] S1: Add the actual power used by the high-voltage accessories to obtain the power value of the accessories;
[0043] Here, the high-voltage accessories include the air-conditioning compressor, PTC, battery heating device HVCH, and DCDC. The vehicle controller adds the actual power used by all high-voltage accessories to obtain the accessory power value.
[0044] Of course, it should be noted that step S1 is executed only during the charging process.
[0045] S2: Monitor the state of the battery, and calculate the maximum allowable charging current of the battery and the required power for charging the battery according to the state of the battery;
[0046] After the battery management system receives the accessory power value sent by the vehicle ...
Embodiment 2
[0063] Such as figure 2 As shown, it is only one of the embodiments of the present invention, and the present invention also provides an electric vehicle charging overcharge protection system, including:
[0064] control module;
[0065] battery monitoring module;
[0066] Modification module;
[0067] Judgment module;
[0068] adjustment module;
[0069] charging module;
[0070] The control module adds the actual power used by the high-voltage accessories to obtain the power value of the accessories, and sends it to the battery monitoring module. The battery monitoring module monitors the battery status, calculates the maximum allowable charging current of the battery and the battery charging demand power according to the battery status, and the correction module sets the correction coefficient. The maximum allowable correction charging current is obtained by multiplying the maximum allowable charging current by the correction coefficient, and the judgment module judge...
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Abstract
The invention provides a charging overcharge protection method and system for an electric vehicle, which relates to the technical field of electric vehicle control. The method includes the following steps: S1: obtain the power value of the accessory; S2: monitor the state of the battery, calculate the maximum allowable charging current of the battery and the battery Charging demand power; S3: Set the correction coefficient to obtain the maximum allowable correction charging current; S4: Determine whether the maximum allowable correction charging current is not less than the actual charging current of the battery, if so, execute S3; otherwise, execute S5; S5: Obtain the overcharge power adjustment value , to obtain the accessory power adjustment value; S6: Generate the real-time charging power output by the charging pile to the vehicle. An electric vehicle charging overcharge protection method and system of the present invention are convenient to control, intelligent and reasonable, and reduce the output power of the charging pile by adjusting the power value of the accessory when there is an overcharging tendency, effectively reducing the charging efficiency without affecting the charging efficiency of the battery. It reduces the risk of battery overcharging and has a wide range of applications.
Description
technical field [0001] The invention relates to the technical field of electric vehicle control, [0002] In particular, the present invention relates to a method and system for overcharging protection of electric vehicles. Background technique [0003] With the strong support of the state, the electric vehicle market continues to heat up, and many new energy vehicle brands have emerged. The good characteristics of lithium-ion batteries are widely used in electric vehicles, and the charging process of batteries is particularly important in the use of automotive power batteries. . [0004] However, although there is an overcharge in the circuit design and a protection circuit in the over-discharge when the electric vehicle is charged, the spontaneous combustion of the electric vehicle occurs from time to time. The overcharge protection system during charging not only monitors the charging status of the battery, but also makes timely control instructions when the battery has...
Claims
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