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Method for testing OCV of nickel-metal hydride battery with different electrified capacities

A technology of nickel-metal hydride battery and test method, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of wasting manpower and equipment resources, and achieve the effects of saving equipment use costs, high testing efficiency, and saving time costs.

Inactive Publication Date: 2019-05-21
NAT ENG RES CENT OF ADVANCED ENERGY STORAGE MATERIALS SHEN ZHEN LTD CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large polarization of the Ni-MH battery, to obtain a real and stable OCV, it takes a long time to measure after the battery is fully charged. Generally, it takes more than 3 hours, which is a waste of manpower and equipment resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A kind of OCV test method of Ni-MH battery under different charging capacity, under the environment temperature T is 25 ± 3 ℃, carry out according to the following steps:

[0016] Ⅰ Test the actual discharge capacity of the battery C 实际 , the specific process is: use 0.2C to discharge to n × 1.05V, then use 0.5C charging current to charge the battery with a constant current to 120% of the rated capacity, put it aside for 30 minutes, and use a 0.5C discharge current to discharge the battery at a constant current to n ×1.0V, where n is the number of single cells connected in series, and the actual discharge capacity C of the battery is recorded 实际 ;

[0017] ⅡDischarge the residual power of the Ni-MH battery: discharge it at 0.2C to n×1.05V, and after 30 minutes, use a charging current of 0.5C to charge the battery with a constant current until the battery charging capacity reaches (M+N)×C 实际 , where M is the battery charge ratio, M is 50%, N is the excess charge ratio,...

Embodiment 2

[0020] A kind of OCV test method of Ni-MH battery under different charging capacity, under the environment temperature T is 25 ± 3 ℃, carry out according to the following steps:

[0021] Ⅰ Test the actual discharge capacity of the battery C 实际 , the specific process is: use 1C to discharge to n×0.9V, then use 0.2C charging current to charge the battery with a constant current to 115% of the rated capacity, put it aside for 30 minutes, and use a 0.2C discharge current to discharge the battery to n× 1.0V, where n is the number of single cells in series, and the actual discharge capacity C of the battery is recorded 实际 ;

[0022] Ⅱ Discharge the residual power of the Ni-MH battery: discharge 1C to n×0.9V, and after 60 minutes, use a charging current of 2C to charge the battery with a constant current until the battery charging capacity reaches (M+N)×C 实际 , where M is the battery charge ratio, M is 30%, N is the excess charge ratio, N is 0.7%, and M and N are based on the actual...

Embodiment 3

[0025] A kind of OCV test method of Ni-MH battery under different charging capacity, under the environment temperature T is 25 ± 3 ℃, carry out according to the following steps:

[0026] Ⅰ Test the actual discharge capacity of the battery C 实际 , the specific process is: use 0.5C to discharge to n×1.0V, then use 1C charging current to charge the battery with a constant current to 110% of the rated capacity, put it aside for 30 minutes, and use a 1C discharge current to discharge the battery to n×0.9 V, where n is the number of single cells connected in series, and the actual discharge capacity of the battery is recorded as C 实际 ;

[0027] ⅡDischarge the residual power of the Ni-MH battery: discharge it at 0.5C to n×1.0V, and after 45 minutes, use a charging current of 1C to charge the battery with a constant current until the battery charging capacity reaches (M+N)×C 实际 , where M is the battery charge ratio, M is 80%, N is the excess charge ratio, N is 0.5%, and M and N are b...

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PUM

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Abstract

The invention provides a method for testing OCV of a nickel-metal hydride battery with different electrified capacities, comprising the steps of at a certain environment temperature T, testing the actual discharge capacity C< actual> of the battery; afterwards, carrying out residual electricity discharging on the nickel-metal hydride battery; after the battery is shelved for a certain time t, carrying constant-current charging on the battery by adopting a certain charging current A until the charging capacity of the battery reaches (M+N)*C< actual>, wherein M is the electrified capacity proportion of the battery, N is the excessive electrified capacity proportion, and M and N are obtained by taking the actual discharge capacity C< actual> of the battery as a cardinal number; and then carrying out constant-current discharging on the battery by adopting a certain discharging current B until the discharging capacity of the battery reaches N*C< actual>, and recording the terminal voltage of the battery after the battery is shelved for 60-120 minutes, wherein the terminal voltage is used as the OCV of the battery with the electrified capacity M. The method is simple and feasible, high in testing speed, relatively high in efficiency and relatively high in accuracy.

Description

technical field [0001] The invention relates to an OCV test method of a nickel-hydrogen battery under different charges. Background technique [0002] OCV is a key factor of Ni-MH batteries. OCV can be used to judge whether the battery is good or bad, as well as its state of charge or charge. Therefore, it is necessary to measure the battery OCV. At present, for the OCV of Ni-MH batteries with different charges, generally after the battery is charged according to the requirements of different charges, the terminal voltage of the battery is measured after a period of time, and then the OCV of the battery with different charges is obtained. However, due to the large polarization of Ni-MH batteries, to obtain a real and stable OCV, it takes a long time to measure after the battery is fully charged, generally more than 3 hours, which is a waste of manpower and equipment resources. Contents of the invention [0003] The invention aims to provide a simple, feasible, fast and hi...

Claims

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Application Information

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IPC IPC(8): G01R31/392
Inventor 钟发平马李匡德志徐国昌何侠柯威
Owner NAT ENG RES CENT OF ADVANCED ENERGY STORAGE MATERIALS SHEN ZHEN LTD CO