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Charging method of lithium ion battery

A lithium-ion battery and charging method technology, which is applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, etc. Effect

Pending Publication Date: 2019-08-23
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a charging method for a lithium-ion battery, which solves the problem that it is difficult to balance both charging efficiency and battery life in the lithium-ion battery charging mode in the prior art

Method used

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  • Charging method of lithium ion battery

Examples

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Embodiment 1

[0030] In order to effectively shorten the charging time of the lithium-ion battery and minimize the impact on the life of the lithium-ion battery, the current step charging method is mainly used to charge the lithium-ion battery. The current ladder charging method process is: for a fully discharged cell, use the first constant current to charge to the first voltage, and then use the second current to charge to the second voltage; repeat the above steps until charging to the charging upper limit voltage VB, Then charge at a constant voltage under the voltage VB until the current I=0.05C0 (C0 is the battery capacity). Wherein, the number of repetitions of the constant current charging step can be adjusted according to actual conditions.

[0031] The step charging method in the prior art improves the charging efficiency, and although it also controls the impact on the life of the lithium-ion battery to a certain extent, the aging rate of the lithium-ion battery cannot be ignored...

Embodiment 2

[0043] Based on Embodiment 1, the optimization process of the lithium-ion battery charging method provided in Embodiment 2 is as follows:

[0044] Charge the battery at a constant current with the first current C1 until the voltage reaches the first voltage V1, which is less than the critical potential of the lithium cell under the current C1;

[0045] Keep the first voltage V1 unchanged and charge the battery at a constant voltage until the current reaches the second current C2, and the V2 is less than the critical potential of the lithium cell under the C2 current;

[0046] Using the second current C2 to charge the battery with a constant current until the voltage reaches the second voltage V2;

[0047] Keep the second voltage V2 unchanged to charge the battery at a constant voltage until the current reaches the third current C3;

[0048] Use the third current C3 to charge the battery with a constant current until the voltage reaches the third voltage V3, and V3 is less tha...

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Abstract

The invention discloses a charging method of a lithium ion battery, and the method comprises N charging stages, wherein each charging stages is provided with a corresponding charging rate, a corresponding charging cut-off voltage and a corresponding minimum current. Each charging stage comprises the following steps: carrying out constant-current charging of the lithium ion battery by adopting a preset charging rate until the voltage reaches the charging cut-off voltage of the stage; carrying out the constant-voltage charging by using the charging cut-off voltage until the current reaches the minimum current of the stage; stopping the charging after the N charging stages are repeated. In the N-th charging stage, the charging cut-off voltage is equal to the charging upper limit voltage VB, the minimum current I is equal to 0.05*C0, wherein the C0 is the capacity of the battery cell. By optimizing the stepped charging mode, the charging time of the lithium battery is effectively shortened, and the charging efficiency is improved; in addition, the stepped charging mode provided by the invention reduces the influence on the service life of the battery, so that the service life of the battery is prolonged while the charging efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of special protection in the lithium-ion battery rapid charging strategy field in the lithium-ion battery technology, and in particular relates to a lithium-ion battery charging method. Background technique [0002] A lithium-ion battery is a secondary battery (rechargeable battery) that operates primarily by moving lithium ions between positive and negative electrodes. During charge and discharge, Li+ intercalates and deintercalates back and forth between the two polar terminals: during charging, Li+ deintercalates from the positive electrode and intercalates into the negative electrode through the electrolyte, making the negative electrode in a lithium-rich state; the reverse is true during discharge. Lithium-ion batteries, as a green and clean sustainable energy, are widely used in electric vehicles. But at present, the endurance of electric vehicles has become a major bottleneck in the development of el...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCH01M10/44Y02E60/10
Inventor 董秋实李恺
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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