Method for preventing small storage battery from being fed when charging electric vehicle

A technology for electric vehicles during charging, applied in the field of electric vehicle power management, can solve problems such as stop charging, overheating of chargers, and small battery feeding, and achieve the effects of prolonging service life, alleviating heat generation, and complete and compact structural design

Pending Publication Date: 2019-03-22

SHANDONG KINGOLD AUTOMOBILE CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of existing electric vehicles that easily lead to small battery feeding when charging, and that the charging machine is easi...

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Method used

(9) vehicle controller (VCU) sends motor discharge command, makes motor control...

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Abstract

The invention discloses a method for preventing a small storage battery from being fed when charging an electric vehicle, wherein when a charger is working, a battery management system (BMS) is awakened through a hard wire, at the same time, a vehicle control unit (VCU) and a direct current direct current converter (DCDC) need to be awakened. When the VCU detects that the whole vehicle is in a charging state, a pre-charge circuit of a motor controller and a main positive relay are sequentially closed, the DCDC is enabled to be in a working state by preset enabled DCDC for charging a small storage battery. When the charging process is over or finished, the enabled DCDC is controlled to close by the VCU, then the main positive relay of the motor is switched off to make the motor enter a discharging state, and after finishing discharging, the DCDC and the VCU enter a dormant state. The method has the advantages that the situation that the charger overheats during charging is relieved, theservice life of the charger is extended, the problem that the charging is stopped due to overheat of the charger in the charging process is solved, the charging time is shortened, and the situation that the small storage battery is fed due to the operation of a heat-removal system in the charging process is effectively relieved.

Application Domain

Electric vehicle charging technologyVehicular energy storage +2

Technology Topic

Electrical batteryPre-charge +6

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Examples

Experimental program(1)

Example Embodiment

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on The embodiments of the present invention and all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] see Figure 1-2 , the present invention provides a technical solution: a method for preventing a small battery from feeding power when an electric vehicle is charging, comprising the following steps:

[0025] (1) First, when the charging gun is plugged in, the charger wakes up the battery management system (BMS), vehicle controller (VCU) and DC-DC converter (DCDC) through hard wires.

[0026] (2) Then when the charger and the battery management system (BMS) communicate normally, the battery relay is closed, and the whole vehicle enters the charging state.

[0027] (3) When the vehicle controller (VCU) detects that the charging status of the charger and the communication status of the DC-DC converter (DCDC) are normal, close the motor pre-charging relay;

[0028] (4) When the vehicle controller (VCU) detects that the bus voltage of the motor reaches 90% of the battery voltage, it closes the main positive relay of the motor, and then disconnects the pre-charge relay of the motor.

[0029] (5) When the high voltage is powered on, the vehicle controller (VCU) sends the DC-DC converter (DCDC) enable, so that the DC-DC converter (DCDC) is in the working mode, supplementing the low-voltage power consumption, and at the same time charging the small battery Charge.

[0030] (6) When the vehicle controller (VCU) detects that the temperature of the charger is too high, it will turn on the water pump and fan according to the heat dissipation requirements of the charger to dissipate heat for the charger.

[0031] (7) When the charging is completed or the charging is completed, the vehicle controller (VCU) turns off the DC-DC converter (DCDC) enable, and at the same time turns off the main positive relay of the motor. At this time, the battery management system (BMS) disconnects the battery positive relay. , Negative relay.

[0032] (9) The vehicle controller (VCU) sends the motor discharge command, so that the bus voltage of the motor controller drops below the safe voltage quickly to ensure high voltage safety.

[0033] (10) After the discharge is completed, the vehicle controller (VCU), DC-DC converter (DCDC), and battery management system (BMS) enter a sleep state.

[0034] The cooling method of the charger is water cooling. The vehicle controller adopts normal fire power supply. The charger power output is 12V. Motor rated 60KW, peak value 120KW.

[0035] Specific principle: When using this method to prevent the small battery from feeding power when charging an electric vehicle, the charger needs to wake up the battery management system (BMS) through a hard line when the charger is working, and it is necessary to wake up the vehicle controller (VCU), DC-DC conversion, etc. (DCDC), when the (VCU) detects that the vehicle is in the charging state, it will close the motor controller pre-charging and main positive relays in turn, and enable (DCDC) by setting (DCDC), so that (DCDC) is in the working state and feed the small battery Charging, when the charging is completed or the charging is completed, the (VCU) controls (DCDC) enable to turn off, and then disconnects the main positive relay of the motor, so that the motor enters the discharge state. After the discharge is completed, (DCDC) and (VCU) enter the dormant state .

[0036] This method of preventing the small battery from feeding power when charging the electric vehicle has a complete and compact structural design, and the invention can effectively avoid the need to turn on the heat dissipation system when the traditional on-board charger is charging the power battery because the charger generates a large amount of heat when it is working. , but in the actual charging process, the current of the 12V power output by the charger is small, which is not enough to support the power consumption required by the heat dissipation system, and the charging process takes a long time, which easily leads to the situation of small battery feeding. The heat generation of the charger during the charging process is solved, thereby prolonging the service life of the charger. The invention solves the problem that the charging stops due to the overheating of the charger during the charging process, and shortens the charging time.

[0037] Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some of the technical features may be replaced by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

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Classification and recommendation of technical efficacy words

Complete and compact structural design
Relieve fever

Method for preventing small storage battery from being fed when charging electric vehicle

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

PUM

Description & Claims & Application Information

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