Charging method for limiting polarization phenomenon of lithium battery

Abstract

The invention discloses a charging method of a lithium battery, which monitors the polarization phenomenon in the charging process, changes the charging pulse according to the polarization phenomenon, and further reduces the influence of the polarization phenomenon on the service life of the battery. The charging process is divided into a plurality of steps, the battery is charged by using a pulse current, and the amplitude and width of the current pulse and the time interval between adjacent pulses are adjusted according to the change speed of voltage between a positive electrode and a negative electrode; and the charging current is adjusted according to the battery temperature condition. The charging method automatically adapts to the condition of the lithium battery, the maximum charging speed is guaranteed, the polarization phenomenon is reduced, the service life of the lithium battery is prolonged, the charging time at the low temperature is shortened, and battery damage caused by too large charging current at the high temperature is avoided.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a charging method for changing charging pulses and limiting polarization phenomena. Background technique [0002] Lithium batteries have a wide range of application scenarios and have become the power source of many important instruments and equipment. However, lithium batteries have the disadvantage of long charging time. Shortening the charging time is a long-term desire of users. The polarization phenomenon in the charging process will cause battery damage and shorten the life of the battery. It is also the wish of users to reduce battery damage and prolong battery life. [0003] In the field of lithium batteries, the charge and discharge rate C is often used to reflect the size of the current. The charge and discharge rate is equal to the charge and discharge current divided by the rated capacity of the battery (the unit is Ampere Hours). In order to shorten the charging time...

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Problems solved by technology

申请公布号为CN112104031A、CN111755764A、CN109510285A、CN112216887A、CN111934037A、CN106532159A、CN106532160A、CN106816659A、CN108258346A、CN103682499A、CN111162332A、CN111697279A、CN103500858A、CN101728579A、CN111614139A的中国专利中都涉及到快速充电方法,它们都没有使用简单的 method to reflect the polarization phenomenon of the battery, without changing the charging method in time according to the polarization phenomenon, there are still defects such as serious polarization phenomenon, long charging time, complicated equipment and methods

[0006] Lithium batteries of the same model and different batches have certain differences, and the performance of lithium batteries will change after a period of use. The existing technology uses the same method to charge these batteries with certain differences, and it is difficult to adapt to the situation of the battery. to adjust the charging parameters

In order to adapt to different battery charge states during the charging process, the existing technology often divides the charging process into several different stages. These stages are fixed and difficult to automatically adjust, and cannot well adapt to different batteries during the charging process. State of charge, it is difficult to achieve better charging speed and charging effect, and it is difficult to achieve a shorter charging time

[0007] The existing technology does not have a simple method to reflect the polarization phenomenon of the battery, and the charging method cannot be changed in time according to the polarization phenomenon. The existing method still has the defects of long charging time and serious polarization of the battery. The existing technology cannot To meet user needs, how to provide a method to solve the above technical problems is a problem that those skilled in the art need to solve

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