Online rapid detection device and method of open-circuit battery in storage battery pack

Abstract

The invention provides an online rapid detection device of an open-circuit battery in a storage battery pack. The storage battery pack comprises a plurality of single batteries connected to positive and negative poles of a battery charger in series and comprises a bottom layer sampling and measuring unit, a bottom layer power circuit unit, an open-circuit testing and protection unit, a bottom layer power control unit, an upper-layer operating system and application unit and an internal resistance / electric conductance testing unit. The bottom layer sampling and measuring unit and the open-circuit testing and protection unit are respectively connected to the positive and negative poles of a certain single battery, the open-circuit testing and protection unit is further connected with the bottom layer power circuit unit, both the bottom layer sampling and measuring unit and the bottom layer power circuit unit are sequentially connected to the upper-layer operating system and application unit and the internal resistance / electric conductance testing unit through the bottom layer power control unit. The online rapid detection device combines with an existing storage battery internal resistance tester, can accurately and rapidly find the open-circuit battery through online discharging of the single batteries and meanwhile does not harm testers and testing instruments and meters.

Description

technical field [0001] The invention relates to a method and a device for detecting open-circuit battery cells when a battery pack is in normal operation. Background technique [0002] The battery pack is in the floating charge state during normal operation. Even if a single cell in the battery pack has an open circuit (broken wire, poor contact, etc.), it is usually difficult to be found in the float charge state. When the mains power is interrupted and the battery is required to supply external power, if there is an open circuit battery, the output of the battery pack will be interrupted instantaneously, unable to supply power to the actual load, which will lead to a major accident. [0003] At present, there are several methods for detecting open-circuit batteries in the industry as follows: [0004] 1. Detect by monitoring the equalizing charge and floating charge current of the system. Its disadvantage is that it is necessary to install monitoring equipment for each b...

AI Technical Summary

Problems solved by technology

The disadvantages are: the battery pack is taken offline, and the battery pack is discharged through the discharge test instrument, the operating load is heavy, and the efficiency is very low; due to the offline battery pack, the system has certain safety hazards; various voltage levels The battery pack needs to be equipped with various applicable discharge loads, and the investment cost is large;

But its disadvantage is that it can only judge that there are open-circuit batteries in this group of batteries, and it is impossible to locate which battery is open-circuit.

Therefore, it is still necessary for inspectors to separate the battery pack and make judgments one by one, and the work efficiency is low.

[0008] Due to the existence of open-circuit batteries, it poses a huge threat to the stability and reliability of the power supply system

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