On-line judgment method for capacity of backup storage battery

Abstract

The invention discloses an on-line judgment method for capacity of a backup storage battery. The prior storage battery capacity measuring technology is lagged. The on-line judgment method for the capacity of the backup storage battery comprises the following steps: obtaining a corresponding relationship between the internal resistance and the capacity of the storage battery through actual measurement, setting the internal resistance of the battery obtained according to the capacity of the storage battery from the corresponding relationship as R1, setting the internal resistance of the storagebattery according to the actual measurement as R2, and calculating a reference value R0 of the internal resistance according to the following formula: R0=omega R1 + (1-omega) R2, wherein in the formula, the omega is a weighting coefficient, the measured current internal resistance of the storage battery correspondingly searched from a graph obtained through the actual measurement is Ri, then the percentage of delta R is equal to (Ri-R0) / R0, and the current capacity range of the storage battery can be determined by a corresponding relationship table of the actual measurement according to the numerical value of the percentage of delta R. The method is used for on-line measurement for the capacity of the storage battery.

Description

Technical field: [0001] The invention relates to an online judging method for the capacity of a backup storage battery. Background technique: [0002] With the improvement of power supply quality requirements in various industries, backup battery packs have been widely used, such as battery packs in electric operating power supplies, battery packs in communication power supplies, battery packs in uninterruptible power supply UPS, and battery packs in emergency power supply EPS. Group. However, in terms of how to master battery capacity technology in a timely manner, domestic and foreign technologies are relatively lagging behind. [0003] At present, in the field of international batteries, the capacity measurement technology of the backup battery pack is carried out by the ampere-hour integration method. In actual work, a flexible method is often used, that is, by discharging the battery at a constant current, the battery is discharged to the cut-off voltage, the time of ...

AI Technical Summary

Problems solved by technology

[0004] 1. It is necessary to separate the battery pack from the working state of the system

The battery pack in the backup power supply is in a backup state for a long time, which brings unsafe hidden dangers to the power supply system.

In addition, this offline discharge process lasts for a long time (including the duration of the checking discharge process and the time it takes for the battery to be fully charged, about 24 hours). Once a power failure occurs in this process, the design function is a backup The battery pack will not be able to provide power supply, which will bring great hidden dangers to the entire power supply system (because the battery pack is out of the system)

[0005]2. During the discharge test, the power consumption of the battery pack is transformed into non-recyclable heat energy, which wastes a lot of energy

However, due to the maintenance requirements of the battery, it is necessary to clearly grasp the current storage capacity of the battery, and the internal resistance cannot intuitively and clearly represent the storage capacity of the battery, so in practical applications, it brings great confusion to battery maintenance.

Images