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Relay control strategy and device for battery of electric vehicle

A relay control, electric vehicle technology, applied in electric vehicles, signal devices, electric traction and other directions, can solve the problems of battery over-discharge, power battery power consumption, safety hazards, etc., to prevent continuous power consumption, reduce maintenance costs, avoid The effect of security risks

Active Publication Date: 2014-09-17
BEIQI FOTON MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the relay fails, such as the relay sticks, the relay will not be disconnected at this time, so that the driver cannot find the relay failure in time when using the existing electric vehicle, hybrid vehicle and fuel cell electric vehicle, resulting in After the vehicle stops running, due to the adhesion of the relay (in a closed state), the high-voltage circuit cannot be disconnected normally, so there is a potential safety hazard
And it may cause the power battery to continue to consume power, resulting in low power, causing the battery to be over-discharged, and the vehicle may not be able to start the next time it is powered on
In addition, over-discharge of the battery may also cause battery damage, and the battery cannot be charged, which will increase the cost of vehicle maintenance

Method used

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  • Relay control strategy and device for battery of electric vehicle
  • Relay control strategy and device for battery of electric vehicle
  • Relay control strategy and device for battery of electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] like figure 2 As shown, when the control signal is a power-off signal, the above detection steps are:

[0047] First, a control signal is sent to the battery management system of the electric vehicle. figure 2 The power-off signal (key off);

[0048] Then, the battery management system receives the power-off signal, and first controls the positive relay to disconnect according to the power-off signal, and then after the positive relay executes the disconnection command, the battery management system will further detect the feedback signal of the positive relay (the voltage of the feedback circuit Whether it is low voltage), and then control the negative relay to disconnect;

[0049] If it is detected that the feedback signal of the positive relay continues to exist (the low voltage continues to exist), it indicates that the positive relay has failed to disconnect, and failures such as adhesion have occurred. At this time, the battery management system will trigger a...

Embodiment 2

[0053] like image 3 As shown, when the control signal is a power-on signal, the above detection steps are:

[0054] First, a control signal is sent to the battery management system of the electric vehicle. image 3 The power-on signal (key on);

[0055] Then the battery management system respectively detects whether the feedback signal of the positive relay and the feedback signal of the negative relay exist according to the power-on signal.

[0056] If the feedback signal detecting at least one of the feedback signal of the positive relay and the feedback signal of the negative relay persists, an alarm signal is triggered. like image 3 As shown, in one embodiment of the present invention, the alarm signal is sent to the vehicle controller, and the vehicle controller records the corresponding fault information according to the alarm signal, and sends an alarm through the alarm device of the electric vehicle to notify the driver . For example, the alarm device can be an ...

Embodiment 3

[0059] like Figure 4 As shown, when the control signal is a charging signal, the above detection steps are:

[0060] First, a control signal is sent to the battery management system of the electric vehicle. Figure 4 in the charging signal.

[0061] Then the battery management system starts self-checking according to the charging signal, and respectively detects the feedback signal of the positive relay and the feedback signal of the negative relay.

[0062] If the feedback signal detecting at least one of the feedback signal of the positive relay and the feedback signal of the negative relay persists, an alarm is triggered. The above detection process is similar to the detection process in Embodiment 2, and will not be repeated here.

[0063] Otherwise, control the negative relay to close and continue to detect whether the charger and the battery of the electric vehicle are abnormal (the charger is damaged or the battery itself fails).

[0064] If it is judged that at le...

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Abstract

The invention provides a relay control strategy and a relay control device for a battery of an electric vehicle. The strategy comprises the following steps: sending a control signal to a battery management system of the electric vehicle; controlling a relay to execute by the battery management system according to the control signal, and detecting the feedback signal of the relay, wherein the relay comprises an anode relay and a cathode relay which are respectively arranged at the anode and the cathode of the battery, and the relay is a relay with a feedback circuit; judging the state of the relay according to the feedback signal; and if the feedback signal of the relay exists, judging that the relay is in the abnormal state, and triggering an alarm signal. According to the relay control strategy, a driver can timely master whether the relay of the battery has faults so as to further avoid hidden safety hazards. In addition, the driver can also timely repair the fault so as to reduce the repair cost. According to the device, the advantages of simplicity in structure and easiness in implementation are achieved.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a battery relay control strategy and device for electric vehicles. Background technique [0002] At present, the battery positive and negative terminals of electric vehicles, hybrid vehicles and fuel cell electric vehicles are usually equipped with relays, so that the opening and closing of the relays can be controlled by electrical signals, so the battery can be powered on and off automatically and conveniently. control. [0003] However, when the relay fails, such as the relay sticks, the relay will not be disconnected at this time, so that the driver cannot find the relay failure in time when using the existing electric vehicle, hybrid vehicle and fuel cell electric vehicle, resulting in After the vehicle stops running, due to the adhesion of the relay (in a closed state), the high-voltage circuit cannot be disconnected normally, so there is a potential safety hazar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L11/18B60Q9/00
CPCY02T10/7005Y02T10/70
Inventor 秦兴权刘波李燕刘义强
Owner BEIQI FOTON MOTOR CO LTD
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