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A method for detecting battery micro-short circuit under extreme conditions
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A limit condition, micro-short-circuit technology, applied in the direction of measuring electricity, measuring electrical variables, measuring current/voltage, etc., can solve problems such as difficult selection, battery performance attenuation, no way to voltage difference, etc., to improve consistency and discharge performance, Improved battery pass rate and easy operation
Active Publication Date: 2021-09-07
INNER MONGOLIA UNIV OF SCI & TECH
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However, in the process of battery pack assembly, there may be micro-short-circuit batteries in batteries with exactly the same voltage. Once a micro-short-circuit battery is selected into the battery pack, after a certain period of use, the battery will be charged and discharged repeatedly. Repeated expansion and contraction, the micro-short circuit is further aggravated, the self-discharge capacity of the battery increases, and the voltage drops rapidly, causing the battery performance to rapidly decay until the voltage is 0V. At this time, the micro-short circuit battery has a serious impact on the entire battery pack, greatly reducing the battery pack. service life, virtually increases the cost of use
[0003] Although the micro-short-circuit battery in the battery pack is very harmful, it is difficult to pick it out, because the micro-short-circuit battery is the same as other batteries in the initial indicators, and cannot be measured by indicators such as voltage and internal resistance. pick out
Moreover, because the self-discharge of the battery is composed of electrochemical self-discharge and micro-short-circuit self-discharge, the electrochemical self-discharge of the battery at room temperature is relatively large, and there is no way to select it by voltage difference
[0004] At present, some nickel-metalhydride battery manufacturers use the method of increasing the thickness of the separator paper to reduce the formation of micro-short-circuit batteries. Although it can achieve certain results, it cannot fundamentally solve the problem, and it is not conducive to the later winding
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Embodiment 1
[0042] Example 1 A method for detecting battery micro-short circuit under extreme conditions
[0043] Take 2,000 finished D-shaped cylindrical Ni-MH batteries after activation, put them in battery trays, and put them into charging and discharging equipment. The battery capacity is 5Ah, that is, C=5;
[0044] (1) Selection of battery CCV internal resistance difference
[0052] Step 7: Discharge at 100A for 10s; record the initial voltage V 0 , cut-off voltage V 1 .
[0053] Battery internal resistance N=(V 0 -V 1 ) / 100, the internal resistance N median value of all tested batteries is 35mΩ, which is recorded a...
Embodiment 2-5
[0108] Example 2-5 Method for detecting battery micro-short circuit under extreme conditions
[0109] Examples 2-5 are respectively a method for detecting battery micro-short circuit under extreme conditions. Take 2000 finished D-shaped cylindrical Ni-MH batteries after activation, put them in battery trays, and put them into charging and discharging equipment. The battery capacity It is 5Ah, that is, C=5; the specific detection steps of the battery are similar to those in Example 1, the only difference is that when the battery OCV voltage is selected, the temperature of the high temperature in the sixth step is different, see the table below for details.
[0110]
[0111] The method provided by Embodiment 2-5 is simple, the process is easy to control, and the micro-short circuit battery is effectively selected, and the pass rate is as high as 99.15%-99.3%, which improves the consistency and discharge performance of the battery pack, and improves the service life of the batt...
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Abstract
The invention discloses a method for detecting a battery micro-short circuit under extreme conditions, which comprises sequentially selecting the CCV internal resistance difference of the battery, selecting the OCV voltage of the battery, selecting the charge retention rate of the battery and secondary selection steps. And the selection of different methods under high current, the micro-short-circuit battery is selected through voltage change, self-discharge change, and internal resistance change under high current. This method effectively selects the micro-short-circuit battery and improves the consistency and consistency of the battery pack. The discharge performance improves the service life of the battery pack, the detection cycle is short, easy to operate, the battery qualification rate is as high as 99.35%, and the battery qualification rate is greatly improved.
Description
technical field [0001] The invention belongs to the technical field of nickel-metalhydride battery detection, and relates to a method for detecting battery micro-short circuit under extreme conditions. Background technique [0002] High-power Ni-MH batteries are usually used in the form of battery packs (that is, the combination of multiple single cells) in aviation, automobiles, communications and other fields. The combination of battery packs has strict requirements on the voltage and internal resistance of the single cells. Among these indicators, voltage is the most important thing, and only batteries with exactly the same voltage can be used in combination. However, in the process of battery packassembly, there may be micro-short-circuit batteries in batteries with exactly the same voltage. Once a micro-short-circuit battery is selected into the battery pack, after a certain period of use, the battery will be charged and discharged repeatedly. Repeated expansion and ...
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