Method for rapidly judging running mileage of battery modules in fault nickel-metal hydride battery pack

Abstract

The invention provides a method for rapidly judging the running mileage of battery modules in a fault nickel-metal hydride battery pack. The method includes the steps that a standard corresponding curve of the charging state direct-current internal resistance of the battery modules and the running mileage is established, then the fault nickel-metal hydride battery pack is disassembled into a plurality of battery modules, and after the fault battery module is selected, the charge state direct-current internal resistance of the residual normal battery modules is measured through the same method;the running mileage of each battery module is judged according to the charging state direct-current internal resistance of the normal battery modules, the charging state direct-current internal resistance of the battery module and the standard corresponding curve of the running mileage. The method for rapidly judging the running mileage of the battery modules in the fault nickel-metal hydride battery pack is simple and feasible, the running mileage of each battery module is judged accurately and quickly according to the charging state direct-current internal resistance of each battery module,the running mileage can be deduced, and a basis is provided for later combination of battery packs.

Description

technical field [0001] The invention relates to a method for judging battery usage in the field of batteries, in particular to a method for quickly judging the running mileage of a battery module in a faulty nickel-metal hydride battery pack. Background technique [0002] In the actual use of nickel-metal hydride battery packs, due to the problems of the use environment and battery production process, when nickel-metal hydride battery packs are used in automobiles, due to the temperature differences between each battery and each module, the battery activity in the higher temperature area higher, which leads to faster aging of this part of the battery, which eventually leads to the failure of the entire battery pack, but there are still many battery modules in the faulty battery pack that can continue to be used if the performance is normal. If the entire battery pack is directly scrapped, it will lead to waste of resources. Therefore, the faulty battery pack can be recycled...

AI Technical Summary

Problems solved by technology

[0002] In the actual use of nickel-metal hydride battery packs, due to the problems of the use environment and battery production process, when nickel-metal hydride battery packs are used in automobiles, due to the temperature differences between each battery and each module, the battery activity in the higher temperature area higher, which leads to faster aging of this part of the battery, which eventually leads to the failure of the entire battery pack, but there are still many battery modules in the faulty battery pack that can continue to be used if the performance is normal. If the entire battery pack is directly scrapped, it will lead to waste of resources

Therefore, the faulty battery pack can be recycled. At present, it is more common to disassemble the module into a single battery, and then judge whether the battery performance is normal by testing the DC internal resistance of the single battery, and the battery DC internal resistance test Methods include bridge method, micro-ohmmeter method, DC voltmeter-ammeter method, no matter which method, the basic principle is Ohm's law, that is, through a known current (or real-time measurement), measure the voltage across the resistor, the voltage Dividing the resistance by the current mainly depends on whether the passing current is appropriate. On the one hand, it will generate a higher voltage, and on the other hand, it will not cause the resistance to heat up or the motor to rotate. The DC voltmeter-ammeter method is the most flexible method. The most accurate method, but this method requires a huge workload for battery test selection and matching, which brings a lot of trouble and economic losses to the company and customers, and the current method cannot well determine how long the battery life is left

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