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Battery management system main relay detection circuit and detection method

A battery management system and detection circuit technology, which is applied in circuit breaker testing, instruments, measuring electricity, etc., can solve problems such as inability to real-time acquisition, incomplete detection of adhesion status, and lack of detection functions in battery management systems.

Pending Publication Date: 2019-01-01
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
At present, the mainstream acquisition relay in the market compares the voltage between the two ends of the relay to the ground to judge the existence of relay adhesion, which cannot be collected in real time.

Method used

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  • Battery management system main relay detection circuit and detection method
  • Battery management system main relay detection circuit and detection method
  • Battery management system main relay detection circuit and detection method

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Embodiment 1

[0047] Such as figure 1 Shown is the main relay detection circuit of Embodiment 1 of the present invention, including the main positive relay detection circuit 10, the main negative relay detection circuit 20 and the push-pull circuit 30, wherein the main positive relay detection circuit 10 is used to switch the main positive relay K1 State detection, adhesion detection or open circuit detection, the main negative relay detection circuit 20 is used for switching state detection, adhesion detection or open circuit detection of the main negative relay K2, and the push-pull circuit 30 is used for the main positive relay detection circuit 10 and the main negative relay The detection circuit 20 provides an input signal; the main positive relay K1 and the main negative relay K2 are respectively connected to the positive pole BAT+ and the negative pole BAT− of the battery 40 .

[0048] 1. Main positive relay detection circuit

[0049] (1) Composition of the detection circuit of the ...

Embodiment 2

[0071] Such as figure 2 Shown is the main relay detection circuit of the second embodiment of the present invention, wherein the composition and connection mode of the push-pull circuit are the same as those of the first embodiment, which are omitted in the figure; the main positive relay detection circuit 10 of the present embodiment and the first embodiment The composition of the main positive relay switch state detection, adhesion detection, and open circuit detection methods are the same as in the first embodiment, and will not be repeated here; the difference between this embodiment and the first embodiment is only that the main negative relay in this embodiment The RC circuit of the relay detection circuit 20 is composed of a resistor R2 and a capacitor C3. One end of the resistor R2 is connected to the push-pull circuit 30, the other end is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the non-battery side PRE- of the ma...

Embodiment 3

[0073] Such as image 3 Shown is the main relay detection circuit of the third embodiment of the present invention. The difference between this embodiment and the second embodiment is only that the connection positions of the resistor R2 and the capacitor C3 in the RC circuit of the main negative relay detection circuit 20 have been exchanged, and the capacitor One end of C3 is connected to the push-pull circuit 30, the other end is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the non-battery side PRE- of the main negative relay K2. The methods for the switch state detection, adhesion detection, and open circuit detection of the main and negative relays are also the same as those in Embodiment 2, and will not be repeated here. Except for the above differences, the others are the same as the second embodiment, and will not be repeated here.

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Abstract

The invention discloses a battery management system main relay detection circuit and detection method. The main relay detection circuit comprises a main positive relay detection circuit. The main positive relay detection circuit comprises a first transformer, a first capacitor unit and a first charging and discharging circuit. The secondary side of the first transformer and the first capacitor unit are connected in series between the positive electrode of the battery and the non-battery side of the main positive relay. One end of the primary side of the first transformer is connected with thefirst input signal, and the other end is connected with the first charging and discharging circuit. The main relay detection method comprises the following steps: firstly collecting the voltage amplitude of the first charging and discharging circuit, and then performing switching state detection, adhesion detection or open circuit detection of the main positive relay by collecting the voltage amplitude of the first charging and discharging circuit. According to the battery management system main relay detection circuit, implementation of the detection function is independent of the repeated closing and opening action of the main relay so as to completely meet the requirements of the specific process of high voltage safe power-on of the electric vehicle.

Description

technical field [0001] The invention relates to a battery management system, in particular to a main relay detection circuit and a detection method of the battery management system. Background technique [0002] The battery is used as the capacity output circuit of the electric vehicle, and the energy output of the power battery is realized through a series of switches of high-voltage devices. The working status of high-voltage devices, especially whether the high-voltage relays at the positive and negative ends of the battery are switched normally, is very necessary to ensure the energy output of the battery. If the relay is damaged or stuck, and the management system does not understand this situation, it may fail. Problem, relay adhesion detection has become one of the necessary functions of modern BMS to eliminate 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...

Claims

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Application Information

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IPC IPC(8): G01R31/327
CPCG01R31/006G01R31/3274
Inventor 王峰张志国胡运平吴坤树
Owner SHENZHEN KELIE TECH