Rapid detection method for available capacity of battery

Abstract

The invention discloses a rapid detection method for the maximum available capacity of a battery. The rapid detection method for the maximum available capacity of the battery comprises the steps that firstly, full-charge and full-discharge cycle life research is conducted in a laboratory, modeling analysis is conducted on a 100% discharge depth and discharge voltage curve, and a discharge track parameter K representing a discharge voltage curve change rule is found; secondly, voltage data of a small rule change section in the discharge initial stage are selected, a curve model parameter A is acquired through data fitting, and then the conversion relation between the discharge track parameter K and the curve model parameter A is established; finally, according to any one battery in an unknown state, the curve model parameter can be obtained through fitting of the voltage data in the rule change section in the discharge initial stage, and is converted into the discharge track parameter on the basis of the conversion relation, and then the current maximum available capacity of the battery is estimated. The rapid detection method for the maximum available capacity of the battery solves the problem that the data volume is large due to the fact that fitting is conducted on discharge whole-process data, and the problem that due to aimless and random data fitting, inaccuracy is caused.

Description

technical field [0001] The invention relates to the technical field of battery life detection, in particular to a method for quickly detecting battery available capacity. Background technique [0002] With the widespread application of electrification devices, electricity is widely used in production, life and national defense. As a storage device for electric energy, the storage capacity is an important basis to reflect the quality of the battery, and it is also a key characteristic that characterizes its ability to meet the use. [0003] Batteries have the characteristics of performance degradation. After being used or stored for a period of time, their maximum storage capacity, that is, the maximum available capacity, will decrease until they are scrapped. The maximum available capacity of the battery is very important to the use of the battery. The phenomenon that the battery is "full as soon as it is charged and empty as soon as it is discharged" occurs from time to tim...

AI Technical Summary

Problems solved by technology

But this is not the case. The voltage only reflects the state of charge of the battery, and cannot determine how much electricity it can discharge. Sometimes the tested voltage is just a virtual voltage.

Therefore, this evaluation method cannot truly and accurately express the actual situation.

[0005] Method 2: Use a battery capacity tester to test the full discharge of the battery, which can test the capacity of the battery, but each test takes a long time, more than 10 hours, and the special test equipment is expensive, and the engineering applicability is greatly limited.

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