Main relay adhesion detection circuit and detection method of vehicle battery management system

A technology for main relays and on-board batteries, which is applied in circuit breaker testing, instruments, and electrical measurement. It can solve problems such as safety, violation, and hidden dangers, and achieve the effects of avoiding continuous discharge, avoiding unsafe factors, and simplifying the design.

Active Publication Date: 2019-11-26
SHENZHEN KELIE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current battery management system is not perfect for the detection of the adhesion state of the main relay of the high-voltage circuit of the power battery. The detection function depends on the repeated closing and opening of the main relay, which violates the specific process requirements of electric vehicles for safe power-on of high voltage

Method used

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  • Main relay adhesion detection circuit and detection method of vehicle battery management system
  • Main relay adhesion detection circuit and detection method of vehicle battery management system
  • Main relay adhesion detection circuit and detection method of vehicle battery management system

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Embodiment Construction

[0047] Embodiments of the present invention will be described in detail below. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0048] refer to Figure 1 to Figure 6 , in one embodiment, a main relay adhesion detection circuit of a vehicle battery management system, including a positive bus BUS+, a negative bus BUS-, and a power battery connected between the positive bus BUS+ and the negative bus BUS-, on the positive bus BUS+ There is an overall positive main relay S1, and an overall negative main relay S5 is set on the negative bus BUS-, which also includes a first switch K1, a second switch K2, a third switch K3, a first resistor R1, a second resistor R2, a seventh Resistor R7 and eighth resistor R8, one end of the first switch K1 is connected to the positive bus BUS+, the first resistor R1 and the second resistor R2 are connected in series to form a voltage divider network,...

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Abstract

A main relay adhesion detection circuit of a vehicle-mounted battery management system, and a method therefor, the circuit comprising a first, second and third switches (K1, K2 and K3), and a first, second, seventh and eighth resistors (R1, R2, R7 and R8). One end of the first switch (K1) is connected with a positive bus (BUS+); the first and the second resistors (R1 and R2) are connected in series to constitute a potential-divider network; the first resistor (R1) is connected with the other end of the first switch (K1); one end of the seventh resistor (R7) is connected with a non-battery side of a master positive main relay (S1); the other end of the seventh resistor (R7) and an eighth resistor (R8) are connected in series to constitute a potential-divider network; the second resistor (R2) and the eighth resistor (R8) are connected with a sampling reference ground; one end of the second switch (K2) is connected with a negative bus (BUS-) and the other end of the second switch (K2) is connected with the sampling reference ground; and one end of the third switch (K3) is connected with a non-battery side of a master negative main relay (S5), and the other end of the third switch (K3) is connected with the sampling reference ground. The circuit and the method can achieve safe, simple and reliable main relay adhesion detection.

Description

technical field [0001] The invention relates to a main relay adhesion detection circuit of a vehicle-mounted battery management system and a detection method thereof. Background technique [0002] With the rapid development of the electric vehicle industry, the importance of the high-voltage part of electric vehicles has attracted more and more attention. The power battery pack is the power source of the whole vehicle. Whether the working status of the main relay in the high-voltage charge-discharge circuit is normal or not directly affects the safety of the whole vehicle. Under normal working conditions, high-voltage power supply or battery charging is carried out to ensure that the power battery avoids misoperation when the main relay fails, and eliminates unsafe factors in the process of high-voltage charging and discharging. The current battery management system is not perfect for the detection of the adhesion state of the main relay of the high-voltage circuit of the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327
CPCG01R31/3278G01R31/327
Inventor 吕宝良张志国胡运平张泱渊
Owner SHENZHEN KELIE TECH
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