Lithium ion battery rapid charging method and lithium ion battery

Abstract

The invention discloses a rapid charging method of a lithium ion battery and the lithium ion battery. The rapid charging method of the lithium ion battery comprises the following steps: detecting a limit state of charge corresponding to a first current of the lithium ion battery under a preset condition, wherein the limit state of charge is a state of charge in which the lithium ion battery is charged under the first current and the lithium ion battery starts to separate out lithium; obtaining a corresponding relation according to the first current and the limit state of charge; formulating a charging process according to the corresponding relationship; and charging the lithium ion battery according to the charging process. By detecting the limit state of charge corresponding to the first current under the preset condition, the corresponding relationship between different charging currents and the corresponding limit state of charge can be obtained by only performing an experiment once, and charging is performed according to the corresponding relationship, so lithium precipitation caused by overlarge charging current can be prevented.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, in particular to a lithium-ion battery fast charging method and the lithium-ion battery. Background technique [0002] As the most widely used secondary battery at present, lithium-ion battery has irreplaceable advantages. The charging process of lithium-ion batteries is mainly the extraction of lithium ions from the positive electrode and the insertion of the negative electrode. The rate of this process is affected by the rate of many electrochemical processes. Taking the commonly used graphite negative electrode system as an example, when the temperature is low or the charging current is too high, the negative electrode is highly polarized. At this time, lithium precipitation occurs on the surface of the negative electrode, which not only affects the charging efficiency of the battery, but also has great safety. risk. In related technologies, although the multi-step and multi-st...

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Problems solved by technology

Taking the commonly used graphite negative electrode system as an example, when the temperature is low or the charging current is too high, the negative electrode is highly polarized. At this time, lithium precipitation occurs on the surface of the negative electrode, which not only affects the charging efficiency of the battery, but also has great safety. risk

In related technologies, although the multi-step and multi-stage fast charging method is relatively convenient to apply, a large number of experiments are required to determine the number of stages and the charging current of each stage in the method formulation stage. For large lithium-ion batteries with high capacity, the experimental Time-consuming and costly, poor practicality

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