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Method for prolonging service life of cylindrical lithium-ion battery

A lithium-ion battery, cylindrical technology, applied in the field of improving the life of cylindrical lithium-ion batteries, can solve the problems of battery cycle life impact, incomplete activation, etc., to achieve the effect of improving life, uniform distribution, and improving cycle life

Inactive Publication Date: 2016-07-13
DONGGUAN CHUANGMING BATTERY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the above existing cylindrical lithium-ion battery technology that the activation is not complete during the initial use and the cycle life of the battery is affected, the purpose of the embodiments of the present invention is to provide a method for improving the life of a cylindrical lithium-ion battery

Method used

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  • Method for prolonging service life of cylindrical lithium-ion battery

Examples

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Effect test

Embodiment 1

[0021] (1) Produce ternary material / graphite batteries according to the normal process. In this example, it refers specifically to 18650 cylindrical batteries. The thermometer tests the surface temperature of the battery. When the surface temperature of the battery reaches 35°C, charge and discharge 10 times in the range of 3.2-4.1V with a current of 0.2C;

[0022] (2) Then put the battery at room temperature, wait until the temperature of the battery drops to room temperature, charge the battery with a constant current of 1C to a voltage of 4.2V, and the charge cut-off current is 0.02C, and then discharge it with a constant current of 1C, the discharge cut-off voltage is 3.0V, cycle performance test results are as attached in the manual figure 1 shown.

Embodiment 2

[0027] (1) Produce lithium iron phosphate / graphite batteries according to the normal process. In this example, it refers specifically to 18650 cylindrical batteries. The thermometer tests the surface temperature of the battery. When the surface temperature of the battery reaches 40°C, charge and discharge 15 times in the range of 2.5-3.4V with a current of 0.3C;

[0028] (2) Then put the battery at room temperature, charge it to 3.65V with a constant current of 1C, the charge cut-off current is 0.02C, and then discharge it with a constant current of 1C, the discharge cut-off voltage is 2.0V, the cycle performance test results are as attached in the manual figure 2 shown.

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Abstract

The invention relates to the technical field of cylindrical batteries and particularly discloses a method for prolonging the service life of a cylindrical lithium-ion battery. The method comprises the step of carrying out circulating charging and discharging on the cylindrical lithium-ion battery with qualified capacity grading by adopting 0-0.5C current at least. The method for prolonging the service life of the cylindrical lithium-ion battery, provided by the embodiment of the invention, is used for carrying out finite circulating charging and discharging on the cylindrical lithium-ion battery with the qualified capacity grading by small current, and active substances of the cylindrical lithium-ion battery are sufficiently activated, so that the infiltration degree of electrolyte on a pole piece is improved, the electrolyte is relatively uniformly distributed in a roll core, and furthermore, the effect of prolonging the cycle life of the battery is realized.

Description

technical field [0001] The invention relates to the technical field of cylindrical batteries, in particular to a method for improving the service life of cylindrical lithium-ion batteries. Background technique [0002] Because the cylindrical lithium-ion battery has the characteristics of high capacity, high output voltage, good cycle charge and discharge performance, stable output voltage, high current discharge, stable electrochemical performance, safe use, high working temperature, etc., it is widely used in the fields of electric tools and electric vehicles. The application in is more and more extensive. [0003] In the prior art, the liquid injection in this type of cylindrical lithium-ion battery manufacturing process generally first installs the battery core into the battery case, and then installs the liquid injection tooling, injects liquid, vacuumizes, restores the atmospheric pressure and stands still. in sequence. Due to the limited internal space of the batter...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 何科峰赵悠曼程建良
Owner DONGGUAN CHUANGMING BATTERY TECH
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