Self-discharge screening SOC range selection method, storage medium and equipment

Abstract

The invention provides a self-discharge screening SOC range selection method. The method comprises the following steps: testing and drawing an OCV-SOC curve of a lithium ion battery; according to theOCV-SOC curve obtained in the step S1, calculating a curve slope corresponding to each SOC point location, and drawing a dOCV/dSOC-SOC curve; and selecting an OCV-SOC linear correlation region, namelya platform interval in a dOCV/dSOC-SOC curve, as an SOC optimization range of self-discharge screening. The invention provides an SOC range selection method for self-discharge screening. By researching battery voltage characteristic data, establishing a correlation curve of battery SOC and voltage, analyzing slope dOCV/dSOC characteristics in different SOC states and considering self-discharge screening effectiveness and aging storage safety, the aging SOC range of mass production implementation is finally determined.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a SOC range selection method, storage medium and equipment for self-discharge screening. Background technique [0002] Lithium-ion soft-pack batteries have the advantages of good safety performance, light weight, high capacity, high energy density, low internal resistance, and flexible design. With the explosive development of new energy vehicles, as well as new energy vehicles' demand for power battery energy density and policy-driven, soft-pack power batteries have rapidly developed and been applied in the field of new energy vehicles by virtue of their own advantages of high energy density and high safety. The market share of soft-pack power batteries continues to rise. [0003] The lithium-ion soft pack power battery pack is composed of multiple single cells connected in parallel in multiple series. During the charging and discharging process of the power bat...

AI Technical Summary

Problems solved by technology

In a higher SOC state, it is helpful for self-discharge screening, but the storage safety hazard is too great; in the half-electric SOC state, due to the difference in the battery voltage drop rate, the effectiveness of self-discharge screening is greatly reduced; in a lower SOC state , the storage security is high, but there is also the problem of a large difference in voltage drop rate, which greatly reduces the effectiveness of self-discharge screening, and also causes more misjudgments of good products, resulting in a decrease in the pass-through rate

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