Lithium battery capacity rapid estimation method

Abstract

The invention relates to the technical field of lithium battery parameter determination methods, in particular to a lithium battery capacity rapid estimation method. The lithium battery capacity rapid estimation method comprises the following steps: (1) taking the-number-set training sample batteries to have an internal resistance test by using a composite pulse current method in order to obtain internal resistance values of the training sample batteries, (2) testing capacity values of the training sample batteries by using a constant current constant voltage test method, (3) taking time-set various current internal resistance of different sampling time of the training sample batteries as input and taking the capacity values as output to establish an internal resistance-capacity neural network model, (4) and testing internal resistance of predicting sample batteries and evaluating the capacity values by using the internal resistance-capacity neural network model established by the training sample batteries. By using the non-linear relationship between the internal resistance and the capacity to establish the internal resistance-capacity neural network model, the lithium battery capacity rapid estimation method can rapidly estimate the capacity of the batteries, eliminate the batteries which have no use value, reduce power loss and equipment loss required in a traditional capacity test, and greatly improve economy.

Description

technical field [0001] The invention relates to the technical field of lithium battery parameter determination methods, in particular to a lithium battery capacity rapid estimation method. Background technique [0002] The large-scale application of electric vehicles was realized at the 2008 Beijing Olympic Games, and 50 pure electric buses were invested to achieve zero emission in the core area of ​​the Olympic Park. According to the national electric vehicle battery use standard, the effective capacity of the power battery for electric vehicles shall not be less than 80% of the rated capacity. According to the current technical level of lithium-ion batteries, when the effective capacity of the battery is lower than 80%, it can be charged and discharged for about 1000 cycles for energy storage. In order to reduce the vehicle cost of electric vehicles, some of the batteries that are still valuable in the eliminated batteries of electric vehicles can be used in energy storag...

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Problems solved by technology

[0010] The object of the present invention is to propose a method for quickly estimating the capacity of a lithium battery in view of the fact that the time required for testing the battery capacity in the prior art is relatively long, no less than 8 hours, and the battery capacity cannot be quickly estimated.

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