Device, method and system for battery testing

Abstract

The invention provides a device, a method and a system for battery testing. Testing instruments such as a charging and discharging instrument and the like are used for testing batteries or single batteries such as a flow redox battery and the like. The battery testing device comprises a testing instrument and a voltage compensation device, the testing instrument is used for executing battery testing, the voltage compensation device is connected between a battery and the testing instrument and used for compensating difference between starting voltage of the testing instrument and end voltage of the battery, and accordingly the testing instrument can be started to execute testing. According to the device, the method and the system for battery testing, compensation voltage is supplied for starting the charging and discharging instrument, and battery testing at low cost and convenient in operation is realized. A leakage detector is provided for the flow redox batteries and capable of detecting leakage of electrolyte timely and conveniently. The testing system can be used for coordinated control, automatic coordinated control is guaranteed to stop system operation when the battery comes abnormal, a testing instrument fails or the electrolyte leaks, and safety in the unattended state is guaranteed.

Description

technical field [0001] The present invention relates to battery testing technology, in particular to a battery testing device, method and system for testing battery cells or battery stacks such as flow batteries by using testing instruments such as charging and discharging instruments. Background technique [0002] All vanadium redox flow battery (VRB) uses vanadium ions of different valence states dissolved in a certain concentration of sulfuric acid solution as the active material for positive and negative electrode reactions during battery charging and discharging. In addition to the general advantages of flow energy storage batteries, all-vanadium redox flow energy storage batteries can also avoid the electrolyte pollution problem caused by ion cross-linking during charging and discharging because the electrolyte metal ion is only vanadium ions, and the vanadium electrolyte The solution can be recycled and regenerated to save resources. [0003] Battery testing is a key...

AI Technical Summary

Problems solved by technology

For all-vanadium redox flow batteries, the open circuit voltage OCV value of the battery cell is generally not more than 1.65V when it is fully charged, and it is generally not more than 1.3V when it is fully discharged. The working voltage after discharge will be lower, sometimes less than 1V, so it is not complete Be applicable

Therefore, the usual practice is to require manufacturers to customize equipment and add Morse circuits. Therefore, to use a charging and discharging instrument, one needs to be customized, which brings higher technical transformation costs and longer cycles.

[0007] In addition, electrochemical test equipment and charge and discharge instruments can only record the voltage, current and temperature change characteristics of single cells (or stacks, that is, battery packs composed of battery cells connected in series or in parallel). For vanadium batteries The status of other process parameters during operation (such as electrolyte flow rate or flow rate, electrolyte temperature, electrolyte liquid level change in the liquid storage tank, etc.) cannot be recorded

That is, the correspondence between battery performance and battery operating status cannot be coupled during the test

[0008] In addition, during the operation of the flow battery, the electrolyte is circulated inside and outside the battery, and it is more sensitive to temperature. Electrolyte precipitation has occurred to block the pipeline, impurities on the surface of the carbon felt electrode have blocked the pipeline, electrolyte leakage or side reactions ( Such as water electrolysis reaction) and other problems

And because the capacity and power of the all-vanadium redox flow battery are relatively independent, the continuous test time in some cases is much longer than other types of batteries, so there are very high requirements for the convenience and safety of the test

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