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Relay protection circuit and method, battery management system and electric vehicle

A technology for relay protection and protection circuits, which is applied in emergency protection circuit devices, electric vehicles, battery/fuel cell control devices, etc. It can solve problems such as potential safety hazards, sticking of power relay contacts, and difficult detection of relay jitter states, so as to prevent The effect of contact sticking

Pending Publication Date: 2022-02-18
SAIC MOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, one of the technical problems solved by the embodiments of the present invention is to provide a relay protection circuit, method, battery management system and electric vehicle to overcome the contact adhesion of the power relay in the prior art, the occurrence time is short and the relay The jitter state is not easy to detect, and there is a defect of great safety hazard

Method used

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  • Relay protection circuit and method, battery management system and electric vehicle
  • Relay protection circuit and method, battery management system and electric vehicle
  • Relay protection circuit and method, battery management system and electric vehicle

Examples

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Embodiment 1

[0035] Embodiment 1 of the present application provides a relay protection circuit. The structure diagram of the relay protection circuit includes an enabling circuit and a voltage detection circuit. The input end of the voltage detection circuit is electrically connected to the first end of the drive circuit of the relay; the output of the voltage detection circuit When the voltage detection circuit detects that the power supply voltage of the drive circuit is lower than the pull-in voltage of the relay, it will send a work instruction to the enable circuit; the output end of the enable circuit is connected to the first drive circuit. The two terminals are electrically connected, and the enabling circuit outputs a control signal according to the work instruction, so that the driving circuit controls the relay to be disconnected according to the control signal.

[0036] optional, figure 1 A structural diagram of a relay protection circuit provided for the embodiment of the pre...

Embodiment 2

[0045] The embodiment of the present application provides a relay protection method, such as Figure 5 as shown, Figure 5 A relay protection method provided in an embodiment of the present application, the relay protection method includes the following steps;

[0046] Step 101, detecting the power supply voltage of the driving circuit of the relay.

[0047] Among them, the drive circuit is used to control the closing or opening of the relay. For example, the power supply voltage of the drive circuit can be derived from the vehicle-mounted DCDC and / or lead-acid battery (12V), and the vehicle-mounted DCDC and / or lead-acid battery (12V) not only supplies power to the drive circuit of the relay, but also supplies power to multiple electrical appliances at the same time , when it is affected by other electrical appliances, it will cause a large drop in voltage, so it is prone to abnormal fluctuations in the voltage of the power supply. The contacts of the relay vibrated, and re...

Embodiment 3

[0063] Based on the relay protection circuit described in the first embodiment above, the embodiment of the present application provides a battery management system, the battery management system (Battery Management System, referred to as BMS) includes but not limited to a control unit, a relay drive circuit, a relay protection circuit , the power supply for the relay drive circuit can be from the vehicle backup lead-acid battery (12V) and / or vehicle DCDC power supply, BMS is an important system for controlling power batteries on electric vehicles, for example, BMS is used to control but not limited to battery packs High voltage power on and off, battery pack SOX state, etc., where SOX state includes but not limited to SOC, SOP estimation, SOC is used to indicate the state of charge estimation of the power lithium battery, reflecting the safety and capacity decay of the lithium battery pack, battery SOP Estimates are used to indicate battery power status, usually expressed as s...

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Abstract

The embodiment of the invention provides a relay protection circuit and method, a battery management system and an electric vehicle. The relay protection circuit is characterized in that an input end of a voltage detection circuit is electrically connected with a first end of a drive circuit of a relay; the output end of the voltage detection circuit is electrically connected with the input end of the enabling circuit, and when the voltage detection circuit detects that the power supply voltage of the driving circuit is lower than the pull-in voltage of the relay, a working instruction is sent to the enabling circuit; the output end of the enabling circuit is electrically connected with the second end of the driving circuit, and the enabling circuit outputs a control signal according to the working instruction, so that the driving circuit controls the relay to be disconnected according to the control signal. The power supply voltage in the drive circuit is detected through the relay protection circuit, and when the power supply voltage does not meet the contact pull-in voltage of the relay, the control signal is output, so that the drive circuit controls the relay to be disconnected according to the control signal, and the potential safety hazard caused by the fact that the contacts of the relay are adhered and cannot be disconnected is prevented.

Description

technical field [0001] The embodiments of the present application relate to the field of electric vehicles, and in particular to a relay protection circuit, method, battery management system and electric vehicles. Background technique [0002] The battery management system (Battery Management System, referred to as BMS) of electric vehicles is an important system for controlling power batteries in electric vehicles. , battery pack state estimation, etc. [0003] The vehicle control unit (Vehicle Control Unit, referred to as VCU) is used to control the start, operation, advance and retreat, speed, stop, and other core control unit components of the motor of the electric vehicle. The VCU controls the high-voltage power-on and power-off of the battery pack. The request is sent to the BMS, and the BMS realizes the disconnection and connection of the high-voltage system by controlling the disconnection and closure of the relay, so as to meet the power-on and power-off requests o...

Claims

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Application Information

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IPC IPC(8): H02H7/18B60L58/10
CPCH02H7/18B60L58/10Y02T10/70
Inventor 陆珂伟李骥陈文迪纪祥
Owner SAIC MOTOR
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