High-voltage state combination detection device for battery

Abstract

The invention discloses a high-voltage state combination detection device for a battery. A general voltage Ua between the positive electrode of a Battery and a negative electrode of the Battery, and terminal voltages Ur and Ur' of two terminals of a resistor R5 are detected, such that the respective insulation resistance to ground Rx and Ry of the positive and negative electrodes of the Battery are calculated, and the state of insulation performance of the Battery is obtained. According to the invention, improvement and perfection are made on the basis of the original insulation detection circuit, and the monitoring of the insulation state of the battery is achieved with good effects, besides, the effective control of pre-charging and the reliable judgment of the state of relays in the main circuit are realized. The device has a simple and effective circuit, and achieves the detection management of relative high-pressure states in the battery system.

Description

technical field [0001] The invention relates to the field of detection of electric vehicles and energy storage battery packs, in particular to a composite detection device for the high-voltage state of the battery pack. Background technique [0002] At present, battery packs are more and more widely used in the field of electric vehicles and energy storage. The voltage of these battery packs is often as high as several hundred volts. There are various high-voltage safety states in their applications that need to be fully monitored and managed to ensure personal safety and reliable operation of the equipment. [0003] Since the leakage state of the battery pack to the ground is related to personal safety, the insulation state detection is the primary aspect of the safety monitoring of the high-voltage battery pack. The current ground voltage detection method is the main method used for insulation detection, such as figure 2 As shown, through the detection of the voltage valu...

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Problems solved by technology

But this method also has several disadvantages. First, the setting of the pre-charging time is inconvenient to set. If it is too long, it will affect the normal startup time of the system. If it is too short, it will cause insufficient pre-charging and generate instantaneous current; second, if the load is short-circuited If there is a fault, the pre-charging with a constant high current for a long time will burn out the power resistor, and at the same time, the main relay or the load will be burned out after the main relay is closed.

[0006] After the main relay in the large current circuit has been protected for a long time, it is prone to sintering short circuit or failure to pull in, and it is impossible to properly protect and manage the battery pack. Therefore, it is necessary to provide early warning management for the real-time working status of the main relay. Real-time monitoring whether the working state of the main relay is consistent with the control state

At present, the MCU is used to directly detect the output signal of the relay with contact feedback. The implementation is relatively simple, but the requirements for the relay function are strong, and the implementation cost is relatively high.

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