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Method for detecting total voltage and insulation resistance of high voltage battery system

A technology of insulation resistance and battery packs, which is applied in the directions of high resistance measurement, current/voltage measurement, resistance/reactance/impedance measurement, etc. It can solve the problems of insulation resistance error, high-voltage detection interference, and susceptibility to interference, etc., to achieve good Accuracy, strong anti-interference ability, and the effect of improving safety

Inactive Publication Date: 2019-01-15
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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Problems solved by technology

Due to the use of signal isolation devices, isolated power modules and other devices in these two methods, the structure is complicated, the cost is relatively high, and the reliability cannot be guaranteed.
[0005] In a high-voltage battery pack system, especially a vehicle-mounted battery pack system, when inverters, motor controllers and other equipment are working, they will cause great interference to high-voltage detection
Especially in the insulation resistance detection, the insulation resistance detection signal is extremely weak and is very susceptible to interference
In addition, in the conventional algorithm, a small deviation in AD sampling will cause an error of tens of kiloohms or even hundreds of kiloohms in the insulation resistance.
In some detection systems, low-pass filters, digital averaging and other methods are used to filter out high-frequency noise, which often cannot achieve good results

Method used

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  • Method for detecting total voltage and insulation resistance of high voltage battery system

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Embodiment Construction

[0036] As an independent module in the electric vehicle BMS (battery management system), the invention communicates with the BMS main control module through the CAN bus, detects the insulation performance of the system in real time, and reports to the main control through the CAN bus, once the insulation is damaged , the main control takes corresponding measures in time, and related actions include: cut off the contactor, sound and light alarm, etc.

[0037]The insulation detection module includes the following parts: battery pack positive and negative buses (B+, B-), high voltage switch (Kp, Kn), resistor network (R1, R2, R3, R4), signal processing circuit (OP1, OP2, OP3 , OP4, OP5, OP6), Dadi (car body). Rp and Rn are the insulation resistance between the positive and negative bus bars and the earth (car body) respectively. It is controlled by an external microcontroller and sampled by AD, and sent to the main control unit through the field bus.

[0038] In this embodiment...

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Abstract

The invention discloses a method for detecting total voltage and insulation resistance of a high voltage battery system. The circuit comprises a voltage divider resistor network composed of resistorsR1 to R4, a high voltage switch network composed of kp and kn, and a positive and negative signal processing circuit composed of OP1 to OP6, R5 to R14, and C1 to C2. The OP1 and OP2 in the signal processing part form a two-way voltage follower. The OP3, capacitor C1, and resistor R5 form a high-pass filter. The OP5 and resistors R7 to R10 form a differential amplifier. The OP4, capacitor C2, and resistor R6 form a high-pass filter. The OP6 and resistors R11 to R14 form a differential amplifier. A good filtering effect is realized by subtracting the high frequency portion from the positive andnegative signals. The method for detecting total voltage and insulation resistance of the high voltage battery system adopts a signal processing method and a calculation method with high efficiency, and solves the problem that the traditional method is costly, the detection algorithm is single, the anti-interference ability is poor, the calculation precision is poor, and various leakage conditionscannot be coped with, and avoids the destroy of the insulation performance of the system during the detection process.

Description

technical field [0001] The invention relates to a method for detecting voltage and resistance, in particular to a method for detecting the total voltage and insulation resistance of a high-voltage battery system, and belongs to the technical field of batteries. Background technique [0002] In electric vehicles and large-scale energy storage battery pack systems, the voltage is often very high, generally several hundred volts, and high-voltage safety protection is an important issue for high-voltage battery pack systems. Under normal conditions, the positive and negative busbars of the battery system and the vehicle body (or the casing of the equipment) have good insulation performance. However, during use, due to vibration, device aging, moisture, corrosion and other problems, insulation damage may occur, and leakage may occur. Affect the personal safety of passengers or operators. Therefore, in this kind of high-voltage battery pack system, it is very necessary to detect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/3835G01R19/25G01R27/14
CPCG01R19/2503G01R27/025G01R27/14
Inventor 雷晶晶唐智黄靖张堤王华文
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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