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Charging method for improving charging efficiency of lithium ion battery

A lithium-ion battery, charging efficiency technology, applied in secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve problems such as reducing charging efficiency, and achieve the effect of improving charging efficiency

Active Publication Date: 2016-02-10
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used constant current and constant voltage charging method cannot take into account the rate performance of various positive electrode materials. The same current is uniformly used to charge the battery at a constant current. Reduced charging efficiency to a certain extent

Method used

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  • Charging method for improving charging efficiency of lithium ion battery
  • Charging method for improving charging efficiency of lithium ion battery
  • Charging method for improving charging efficiency of lithium ion battery

Examples

Experimental program
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Embodiment 1

[0029] In this embodiment, a positive electrode is made of LiFePO 4 (Material 1, mass percent w=90%) and LiMn 2 o 4 (Material 2) A lithium-ion battery (hereinafter referred to as 1-1 battery) composed of two (i=2) active materials is charged. 1-1 In the battery, the mass ratio of the two materials is LiFePO 4 : LiMn 2 o 4 =9:1. The reference battery of the two materials is: the positive electrode material is only LiFePO 4 (hereinafter referred to as 1-2 battery), and the positive electrode material is only LiMn 2 o 4 (hereinafter referred to as 1-3 batteries). The manufacturing process of the three batteries is exactly the same.

[0030] Charge the 1-1 battery with the following standard charging method to determine the battery capacity: charge at 4A constant current to 4.2V, then switch to constant voltage charging at 4.2V, and the charging cut-off current is 0.4A. It is obtained that the battery capacity is 20.1Ah, and the current corresponding rate of constant cur...

Embodiment 2

[0039] In this embodiment, a positive electrode is made of Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 (Material 1) and LiMn 2 o 4(Material 2) A lithium-ion battery composed of two active materials (hereinafter referred to as 2-1 battery) is charged. In the 2-1 battery, the material mass ratio is material 1: material 2 = 20:80. Reference battery: the positive electrode material is only Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 (hereinafter referred to as 2-2 battery), and the positive electrode material is only LiMn 2 o 4 (hereinafter referred to as 2-3 batteries). The manufacturing process of the three batteries is exactly the same.

[0040] Charge the 2-1 battery with the following standard charging method to determine the battery capacity: charge with a constant current of 2A to 4.2V, then charge with a constant voltage at 4.2V, and the charging cut-off current is 0.2A. It is obtained that the battery capacity is 9.9Ah, and the constant current charging current corresponds to a rate of 0....

Embodiment 3

[0049] In this embodiment, a positive electrode is made of LiFePO 4 (Material 1), Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 (Material 2), LiMn 2 o 4 (Material 3) A lithium-ion battery composed of three active materials (hereinafter referred to as 3-1 battery) is charged. The mass ratio of the three materials is 1:1:3. Reference battery: the positive electrode material is LiFePO only 4 (hereinafter referred to as 3-2 battery), the positive electrode material is only Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 (hereinafter referred to as 3-3 battery), the positive electrode material is only LiMn 2 o 4 (hereinafter referred to as 3-4 batteries). The manufacturing process of the four batteries is exactly the same.

[0050] Charge the 3-1 battery with the following standard charging method to determine the battery capacity: charge with a constant current of 4A to 4.2V, then charge with a constant voltage at 4.2V, and the charging cut-off current is 0.4A. The battery capacity is obtained as 20.2...

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Abstract

The invention provides a charging method for improving charging efficiency of a lithium ion battery. The positive electrode of the lithium ion battery comprises i ( i is greater than or equal to 2) kinds of active substances; the charging method comprises the following steps: (1) voltage is divided into n sections from a small magnitude to a high magnitude within a limited charge voltage scope of the battery, wherein the n is greater than or equal to i; and (2) constant current charging is performed in each voltage section separately; the current is not lower than 0.01C charging multiplying power of a to-be-charged battery, and the charging currents for the adjacent voltage sections are different; when an end voltage of a voltage section is reached, constant voltage charging is performed on the voltage section by the end voltage, or a next voltage section is subjected to the constant current charging, or the charging process is stopped. The charging method can improve the charging efficiency of the battery, and charge the battery with more electric quantity at a shorter time for realizing the rapid charging of the battery.

Description

technical field [0001] The invention relates to the technical field of battery charging, in particular to a charging method for a lithium ion battery whose positive electrode is composed of two or more active materials. Background technique [0002] With the continuous development of technology and the gradual improvement of the industrial chain, the application of lithium-ion batteries in the power field continues to expand. Because of the advantages of high energy density, environmental protection, and good rate performance, it has become the main battery in electric vehicles (EV, HEV, PHEV). A type of battery used. However, long charging time and short driving range cannot meet the market demand and become one of the main bottlenecks hindering the development of electric vehicles; usually, the longer the driving range, the longer the charging time is required. Therefore, how to shorten the charging time and improve the charging efficiency has become a main direction for ...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCY02E60/10
Inventor 李群徐金龙吴宁宁孙雯石强刘沙
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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