Electric vehicle charging overcharge protection method and system

A technology for overcharge protection and electric vehicles, applied in the direction of electric vehicle charging technology, electric vehicles, charging stations, etc., can solve the problems of spontaneous combustion of electric vehicles, achieve the effects of reducing output power, convenient control, and wide application range

Active Publication Date: 2020-03-31
HOZON NEW ENERGY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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

Method used

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  • Electric vehicle charging overcharge protection method and system
  • Electric vehicle charging overcharge protection method and system

Examples

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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 an electric vehicle charging overcharge protection method and system, and relates to the technical field of electric vehicle control, and the method comprises the following steps: S1, obtaining an accessory power value; S2, monitoring the state of the battery, and calculating the maximum allowable charging current of the battery and the charging demand power of the battery;S3, setting a correction coefficient, and obtaining a maximum allowable correction charging current; S4, judging whether the maximum allowable correction charging current is not less than the actual charging current of the battery or not, and if so, executing S3; otherwise, executing S5; S5, obtaining an overcharge power adjustment value, and obtaining an accessory power adjustment value; and S6,generating real-time charging power output to the whole vehicle by the charging pile. The electric vehicle charging overcharge protection method and system are convenient to control, intelligent and reasonable, the output power of the charging pile is reduced by adjusting the accessory power value when an overcharge trend exists, the battery overcharge risk is effectively reduced on the premise that the battery charging efficiency is not affected, and the application range is wide.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00B60L58/15B60L53/62B60L53/60H02H7/18
CPCB60L53/60B60L53/62B60L58/15H02H7/18H02J7/007Y02T10/70Y02T10/7072Y02T90/12
Inventor 崔挺肖岩
Owner HOZON NEW ENERGY AUTOMOBILE CO LTD
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