Charging method of power lithium ion batteries

A charging method and battery charging technology, applied in the field of lithium-ion batteries, can solve the problems of small constant current charging current, affecting charging speed, and small charging current, so as to increase charging current, reduce polarization phenomenon, and speed up charging Effect

Inactive Publication Date: 2014-01-01
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is: in order to prevent the battery from overheating, the constant current charging current is small and the charging speed is slow
The disadvantage is: the charging current is

Method used

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  • Charging method of power lithium ion batteries
  • Charging method of power lithium ion batteries
  • Charging method of power lithium ion batteries

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Embodiment Construction

[0013] The implementation process of the present invention is divided into three stages: pre-charging, segmented constant current charging and pulse charging, including the following seven steps. Concrete embodiment carries out by seven steps, as figure 2 Shown:

[0014] Now take a power lithium-ion battery composed of 100 single lithium-ion batteries (each battery capacity is 2000mAh, threshold voltage is 2.5V, upper limit voltage is 4.2V) as an example, let 10 batteries be connected in parallel as a group, let If 10 groups of batteries are connected in parallel, the total capacity is 20Ah, the total threshold voltage is 25V, and the total rated upper limit voltage is 42V.

[0015] Step 1. Detect the battery terminal voltage and judge whether the terminal voltage is lower than the threshold voltage of 25V. If yes, precharge the battery with a small current of 2A. If not, proceed to step 2;

[0016] Step 2. Determine whether the battery capacity is lower than 25%, if yes, c...

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Abstract

The invention discloses a charging method of power lithium ion batteries, and belongs to the field of power lithium ion battery technology. The charging method comprises three steps: step one, precharge, wherein when the voltage of a power lithium ion battery is lower than a threshold voltage, the power lithium ion battery is charged with electric current I1=0.1C so as to increase the voltage to the threshold voltage; step two, variable current charging, wherein the power lithium ion battery is charged by using different electric currents according to the battery level so as to increase the battery level to 80% of the battery capacity at last; and step three, pulse current charging, wherein pulse intermittent charging of the power lithium ion battery is realized by using current I7=1C, charging time Tc=1s, and then charging is stopped; when the battery voltage reduces to an upper limit voltage, and is equal to 4.2V, the power lithium ion battery is charged by using current I7=1C, and charging time Tc=1s; charging and stop charging operations are repeated continuously as above; in the charging process, the time of stop charging is gradually prolonged because that the power lithium ion battery is gradually fully charged; and when pulse charging is as small as 5% to 10%, charging is stopped. The charging method is capable of increasing charging speed and battery service efficiency.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a charging method for a power lithium-ion battery. Background technique [0002] The power lithium-ion battery is a new type of high-energy battery successfully developed in the 20th century. The negative electrode material of this battery is metal lithium, and the positive electrode material is LiCoO 2 or LiMn 2 o 4 or LiFePO 4 wait. Because of its advantages of high output voltage, long cycle life, high energy density, low self-discharge, no memory effect, and wide operating temperature range, it has been widely used in electric vehicles, ships, aerospace, and energy storage. [0003] For power lithium-ion batteries, a reasonable charging method can improve battery efficiency and prolong battery life. At present, there are three common charging methods for lithium-ion batteries: constant current and constant voltage charging, segmental constant current cha...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCY02E60/12H01M10/446Y02E60/10
Inventor 何秋生徐磊赵志诚段勇勇
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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