Storage battery pack sampling line breakage detection device and method

Abstract

The invention provides a storage battery pack sampling line breakage detection device and a storage battery pack sampling line breakage detection method. The line breakage detection device comprises acurrent-limiting resistor module which comprises n current-limiting resistors and a reference current-limiting resistor, a divider resistor module comprising n divider resistors, detection switch modules in which each detection switch is provided with one end connected with the corresponding divider resistor and provided with the other end connected with the corresponding current-limiting resistor and the divider resistor corresponding to the adjacent high-node single battery, a switching resistor module comprising n switching resistor units, a voltage acquisition module each used for singlebattery voltage acquisition and voltage real-time diagnosis, a comparison and judgment module used for turning off a corresponding switching tube when judging that the voltage of the single battery isgreater than a preset reference voltage, and a microprocessor used for controlling the on-off of the detection switches, calculating a theoretical diagnosis voltage, and judging that a correspondingacquisition line is in a broken line state when judging that the real-time diagnosis voltage is not in the error range of the corresponding theoretical diagnosis voltage.

Description

technical field [0001] The invention belongs to the technical field of disconnection detection of a sampling line of a battery pack, and in particular relates to a device and a method for detecting a disconnection of a sampling line of a battery pack. Background technique [0002] As storage energy and driving energy, battery packs are widely used in aerospace, automobile and electric power and other related fields, especially in recent years, they have been widely used and vigorously developed. In the process of using the battery, the battery management system (BMS) is indispensable. The wide application of BMS has exposed many problems that will affect the normal operation of the battery system, among which the problem of battery disconnection detection is particularly prominent. [0003] In the current BMS system, disconnection detection usually adopts such as Figure 5 Shown is a series resistor sampling line disconnection detection device 300 including a current limitin...

AI Technical Summary

Problems solved by technology

However, since all the voltage-dividing resistors are connected in series with each other, the reduced voltage will be added to the adjacent battery. At the same time, each voltage-dividing resistor has a fixed resistance value and cannot be switched according to the voltage. It is easy to cause the adjacent battery to trigger overvoltage, and it is easy to trigger overvoltage and undervoltage at low voltage

The overvoltage and undervoltage of a single battery is a serious failure, which will cause the system to stop working

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