High voltage relay adhesion detection circuit of battery management system and detection method

A technology of battery management system and high-voltage relay, which is applied in the direction of circuit breaker testing, instrumentation, and electrical measurement. It can solve problems such as inability to disconnect in time, inability to detect high-voltage relay adhesion in a timely and effective manner, and affect the safety of power batteries. To achieve the effect of system power-off protection

Inactive Publication Date: 2016-04-27
HUIZHOU BNET TECH CO LTD
View PDF9 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the main factors affecting the safety of power batteries is the adhesion of high voltage relays
The high-voltage relay is used to control the on-off of the power battery and the motor of the electric vehicle. If the high-voltage relay has adhesion problems, the high-voltage relay cannot be disconnected in time when it needs to be disconnected, which will easily lead to over-discharge and over-temperature of the power battery. There may even be serious accidents such as fire and explosion, which seriously threaten personal safety.
[0003] In the prior art, the battery management system has a variety of detection methods for high-voltage relay adhesion, but they are basically detected before the battery management system is powered on, and the high-voltage relay adhesion usually occurs when the battery management system is powered on or It is generated during the operation of the system, so the existing high-voltage relay adhesion detection method cannot detect the problem of high-voltage relay adhesion in a timely and effective manner
[0004] In addition, the existing battery management system can only detect the adhesion of the high-voltage relay, but it has not yet cut off the power supply in time when the high-voltage relay is detected, which cannot prevent the power battery from getting out of control and cannot ensure the safety of the power battery.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High voltage relay adhesion detection circuit of battery management system and detection method
  • High voltage relay adhesion detection circuit of battery management system and detection method
  • High voltage relay adhesion detection circuit of battery management system and detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 of the present invention provides a high voltage relay adhesion detection circuit of a battery management system. refer to figure 1 , the high voltage relay adhesion detection circuit of the battery management system includes:

[0035] High voltage relay series branch, freewheeling detection branch, voltage sampling branch and battery management system,

[0036] One end of the relay parallel branch composed of the high-voltage relay series branch and the freewheeling detection branch is connected to the total positive terminal of the power battery, and the other end is connected to the high-voltage line input end of the battery management system, and the high-voltage line output end of the battery management system is connected in series for voltage sampling The branch is connected to the total negative terminal of the battery, the series branch of the high voltage relay includes more than one total positive relay connected in series, the freewheel detecti...

Embodiment 2

[0038] Embodiment 2 of the present invention provides a high voltage relay adhesion detection circuit of a battery management system, which is an improvement on the basis of Embodiment 1. refer to figure 2 , the high voltage relay adhesion detection circuit of the battery management system includes:

[0039] High voltage relay series branch, freewheeling detection branch, voltage sampling branch and battery management system.

[0040] One end of the relay parallel branch composed of the high-voltage relay series branch and the freewheeling detection branch is connected to the total positive terminal B+ of the power battery, and the other end is connected to the high-voltage line input terminal of the battery management system. The high-voltage relay series branch includes a first main positive relay K1 and a second main positive relay K2 connected in series. The freewheeling detection branch includes a first freewheeling relay K3, a second freewheeling relay K4 and a first ...

Embodiment 3

[0044] Embodiment 3 of the present invention provides a high-voltage relay adhesion detection method based on the high-voltage relay adhesion detection circuit of the battery management system in Embodiment 1. Refer to image 3 , the high voltage relay adhesion detection method of the battery management system includes the following steps:

[0045] 11 Close all the total positive relays and freewheeling relays, and detect the reference voltage V0 of the voltage detection terminal of the voltage sampling branch at this time;

[0046] 12 Carry out adhesion judgment on the total positive relay and freewheeling relay in turn, the process is as follows:

[0047] 121 Disconnect one of the total positive relays or freewheeling relays, close all other total positive relays and freewheeling relays, and detect the sampling voltage V1 of the voltage detection terminal of the voltage sampling branch at this time;

[0048] 122 compares the sampling voltage V1 with the reference voltage V0...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a high voltage relay adhesion detection circuit of a battery management system and a detection method. The high voltage relay adhesion detection circuit of a battery management system comprises a high voltage relay series connection branch, a freewheeling detection branch, a voltage collection branch and a battery management system. The battery management system determines the adhesion condition through controlling the on-and-off of the total positive relay, the follow current relay and the sampling voltage according to the voltage sampling branch; and when all the total positive relays and the follow current relays are switched off, the reference voltage V0 of the voltage detection end of the voltage sampling branch is detected. The invention adopts the two working channels which are a high voltage relay serial connection branch and a follow current detection branch; when adhesion of any relay of the working channel is detected, another working channel maintains the power supply output, which guarantees the normal power supply for working and realizes the fact that the adhesion of the relay can be detected during the whole operation process; and when the adhesion of the relay is detected, other relays are disconnected so as to disconnect the power supply of the system to realize the power off protection of the system.

Description

technical field [0001] The invention relates to the technical field of battery management, and more specifically relates to a high-voltage relay adhesion detection circuit and a detection method of a battery management system. Background technique [0002] With the promotion of the national new energy policy, the market share of electric vehicles is increasing, but incidents of electric vehicle fires also occur frequently. Therefore, people pay more and more attention to the safety of the power battery that provides power for electric vehicles, so the battery management system that manages the power battery has become an aspect that needs to be improved urgently. One of the main factors affecting the safety of power batteries is the adhesion of high voltage relays. The high-voltage relay is used to control the on-off of the power battery and the motor of the electric vehicle. If the high-voltage relay has adhesion problems, the high-voltage relay cannot be disconnected in t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R31/327G01R31/02B60L3/04
CPCB60L3/04G01R31/3272G01R31/50
Inventor 徐文赋任素云王延聪
Owner HUIZHOU BNET TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products