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Lithium ion battery quick charging method considering battery polarization degree

A lithium-ion battery, polarization degree technology, used in secondary battery charging/discharging, battery circuit devices, battery overcurrent protection, etc.

Active Publication Date: 2021-09-17
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of this, the present invention quantifies the degree of battery polarization and tracks and controls it in real time, and proposes a fast charging method for lithium-ion batteries that considers the degree of battery polarization to solve the above-mentioned problems in the existing charging methods

Method used

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  • Lithium ion battery quick charging method considering battery polarization degree
  • Lithium ion battery quick charging method considering battery polarization degree
  • Lithium ion battery quick charging method considering battery polarization degree

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Embodiment 1

[0097] Charging efficiency (charged electricity per unit time) and battery temperature rise are considered to be important reference standards for weighing charging methods. This embodiment provides the aforementioned charging method using the present invention (the charging method of the present invention is referred to as constant in the follow-up content). Polarization-constant voltage charging, abbreviated as CDOP-CV) charging lithium battery case, and select the commonly used CC-CV charging method as the control group. The following is attached figure 1 , which specifically describes the implementation of the present invention in the field of battery charging, including the following steps.

[0098] Step 1. This experiment uses a Samsung INR18650-33G cylindrical lithium-ion battery, the upper and lower cut-off voltages are 4.15V and 2.5V respectively, and the battery operating temperature range (-20°C ~ 60°C). The pretreatment of the INR18650-33G battery includes the cal...

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Abstract

The invention discloses a lithium ion battery quick charging method considering the polarization degree of a battery. The method comprises the steps: defining a time continuous expression of the polarization degree based on an n-order RC equivalent circuit model of the battery, and enabling the time continuous expression of the polarization degree to represent the change of the polarization degree along with the change of a charging current; in the charging process, real-time external characteristic parameters of the battery are collected; and dividing the charging process into two stages for control: in the first stage, calculating the real-time polarization degree of the battery according to the real-time external characteristic parameters, and adjusting the charging current of the battery in real time based on the deviation between the real-time polarization degree and a preset target polarization degree so as to adjust the polarization degree, enabling the polarization degree to approach the target polarization degree; and when the first-stage charging reaches the cut-off voltage, entering the second stage, and converting into constant-voltage charging until the battery is fully charged.

Description

technical field [0001] The invention relates to the technical field of battery fast charging, in particular to a battery fast charging method for quantifying the degree of battery polarization and tracking and controlling it in real time. Background technique [0002] In industrial environments and daily use scenarios, the charging process of secondary batteries represented by lithium-ion batteries needs to meet high charging efficiency and safety requirements. Based on this, a large number of researchers have proposed a variety of charging methods, and from different The target dimension of the charging process optimizes the current, voltage and other related parameters. [0003] At present, lithium-ion battery charging methods can be roughly divided into five categories: constant current constant voltage (CC-CV) charging, multi-stage constant current charging, pulse charging, intelligent charging and other charging methods. Among the different types of charging methods, t...

Claims

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Application Information

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IPC IPC(8): H01M10/44H02J7/00
CPCH01M10/44H02J7/007H02J7/00712H02J7/0069H02J7/00714H02J7/007182H02J7/00304H02J7/00308Y02E60/10
Inventor 夏必忠叶波曹健文陈广浩颜晓明
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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