Method for testing performance of power lithium ion battery at normal temperature

Abstract

The invention discloses a method for testing the performance of a power lithium ion battery at normal temperature. The method comprises the following specific steps: step 1, carrying out 0.05 C current constant-current discharging on the power lithium ion battery to be measured; step 2, carrying out 1C current constant-current charging on the lithium ion battery; step 3, carrying out 0.33 C current constant-current charging on the lithium ion battery; step 4, charging the lithium ion battery at 0.05 C current in a constant-current mode; step 5, discharging the lithium ion battery at a constantcurrent of 1C; step 6, performing constant-current discharging of the lithium ion battery at the current of 0.33 C; and step 7, discharging the lithium ion battery at a constant current of 0.05 C, cutting off the discharge voltage when reaching 2.5 V, and recording the discharge capacity W6 of the current section. Compared with different lithium battery monomers, if W1 / (W1 + W2 + W3) and W4 / (W4 +W5 + W6) are larger, the 1C charging capacity of the battery accounts for a large percentage of the total capacity, and the quick charging / quick discharging performance of the battery is good; and ifthe W3 / (W1 + W2 + W3) and the W6 / (W4 + W5 + W6) are smaller, the smaller the percentage of the unavailable capacity of the battery in the total capacity is, the higher the effective utilization rateof the battery capacity is, and the better the battery performance is.

Description

technical field [0001] The invention relates to the technical field of power lithium-ion battery improvement, in particular to a method for testing the performance of a power lithium-ion battery at normal temperature. Background technique [0002] Faced with the increasingly depleted fossil energy, countries around the world are developing alternative energy and encouraging the development of new energy industries. New energy electric vehicles using batteries as energy storage devices have become a key industry for strategic development in various countries. Lithium-ion batteries have become the mainstream power batteries for electric vehicles due to their advantages of long cycle life, high specific energy, and environmental protection. At present, there are many power battery manufacturers in the market, and there are various battery specifications and types. There is an urgent need for a general method of testing battery performance, which can quickly and easily compare ...

AI Technical Summary

Problems solved by technology

At present, the working voltage range of mainstream lithium battery monomers in the market is 2.5-4.2V. Electric vehicles require batteries with good consistency and large charge / discharge current. The current battery performance test method is based on the working voltage range of different batteries. It is impossible to intuitively compare the advantages and disadvantages of various batteries

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