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Activation method of cylindrical lithium ion battery

A lithium-ion battery and activation method technology, which is applied in the activation field of cylindrical lithium-ion batteries, can solve the problems of centrifugation to the gap of the steel shell, the core cannot be rolled, the activation time is long, the core cannot be rolled, and the electrolyte is fully infiltrated, so as to shorten the activation time. time, increase the gram capacity and energy density, and ensure the effect of liquid retention

Active Publication Date: 2020-02-21
DONGGUAN CHUANGMING BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems existing in the above-mentioned activation process of the current cylindrical lithium-ion batteries, such as long activation time and inability to fully infiltrate the winding core with the electrolyte or easy centrifugation of the electrolyte to the gap of the steel shell, the core cannot be fully infiltrated. The embodiment of the invention provides an activation method for a cylindrical lithium-ion battery

Method used

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  • Activation method of cylindrical lithium ion battery

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Effect test

Embodiment 1

[0044] A kind of activation method of cylindrical lithium ion battery, a batch (total 1000) 18650 type cylindrical lithium ion batteries after liquid injection sealing are carried out following activation treatment:

[0045] (1) Blast heating treatment: During the blast heating process, the temperature is raised from room temperature to 55°C at a heating rate of 2.0°C / s, and then kept at 55°C for 10 minutes; then the temperature is raised to 70°C at a heating rate of 2.0°C / s, Keep at 70°C for 25 minutes; then raise the temperature to 85°C at a heating rate of 1.5°C / s, and keep at 85°C for 20 minutes.

[0046] (2) Ultrasonic treatment: After blasting heat treatment, cool down to room temperature naturally, then continue to stand at room temperature for 10 minutes, transfer the batch of cylindrical lithium-ion batteries to an ultrasonic instrument, and perform ultrasonic treatment. The ultrasonic frequency is 50KHz. The time is 60 minutes.

[0047] (3) General mechanical vibrat...

Embodiment 2

[0051] A kind of activation method of cylindrical lithium ion battery, a batch (total 1000) 18650 type cylindrical lithium ion batteries after liquid injection sealing are carried out following activation treatment:

[0052] (1) Blast heating treatment: During the blast heating process, the temperature is raised from room temperature to 55°C at a heating rate of 2.0°C / s, and then kept at 55°C for 10 minutes; then the temperature is raised to 70°C at a heating rate of 2.0°C / s, Keep at 70°C for 20 minutes; then raise the temperature to 85°C at a heating rate of 1.5°C / s, and keep at 85°C for 20 minutes.

[0053] (2) Ultrasonic treatment: After blasting heat treatment, cool down to room temperature naturally, then continue to stand at room temperature for 10 minutes, transfer the batch of cylindrical lithium-ion batteries to an ultrasonic instrument, and perform ultrasonic treatment. The ultrasonic frequency is 55KHz. The time is 50 minutes.

[0054] (3) General mechanical vibrat...

Embodiment 3

[0058] A kind of activation method of cylindrical lithium ion battery, a batch (total 1000) 18650 type cylindrical lithium ion batteries after liquid injection sealing are carried out following activation treatment:

[0059] (1) Blast heating treatment: During the blast heating process, the temperature is raised from room temperature to 55°C at a heating rate of 2.0°C / s, and then kept at 55°C for 10 minutes; then the temperature is raised to 70°C at a heating rate of 2.0°C / s, Keep at 70°C for 15 minutes; then raise the temperature to 85°C at a heating rate of 1.5°C / s, and keep at 85°C for 20 minutes.

[0060] (2) Ultrasonic treatment: After blasting heat treatment, cool down to room temperature naturally, then continue to stand at room temperature for 10 minutes, transfer the batch of cylindrical lithium-ion batteries to an ultrasonic instrument, and perform ultrasonic treatment. The ultrasonic frequency is 60KHz. The time is 40 minutes.

[0061] (3) General mechanical vibrat...

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Abstract

The invention provides an activation method for a cylindrical lithium ion battery. The activation method of the cylindrical lithium ion battery includes at least sequentially performing gradient heating treatment, ultrasonic treatment, general mechanical vibration treatment and constant temperature water bath treatment on the cylindrical lithium ion battery after liquid injection and sealing; wherein, the temperature of the gradient heating treatment Gradiently rise from 50°C to 85°C, and the entire gradient heat treatment process takes 50min to 60min. This activation method not only makes the electrolyte of the cylindrical lithium-ion battery fully infiltrate the active material and the diaphragm in the winding core, but also ensures the liquid retention of the active material and the diaphragm to the electrolyte, and also shortens the battery activation time after the liquid injection, and then Improve the gram capacity and energy density of active materials in cylindrical lithium-ion batteries, and ultimately improve the cycle life of cylindrical lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an activation method of a cylindrical lithium ion battery. Background technique [0002] Lithium batteries are widely used in instrumentation, memory power supply, military, oil drilling and other fields due to their high energy, low self-discharge rate, long storage life and environmental protection. [0003] The Ministry of Industry and Information Technology requires China's lithium-ion batteries to rapidly upgrade their technology. By 2020, the energy density of new lithium-ion battery cells will be more than doubled to 350Wh / Kg; the energy density of battery systems will be doubled to 260Wh / Kg. . [0004] Although the energy density of the current cylindrical single battery is rapidly increasing, the energy density is >250Wh / Kg, the content of active materials and the compaction of the pole piece are greatly increased, but the overall liquid abs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCH01M10/0422H01M10/0431H01M10/058Y02E60/10Y02P70/50
Inventor 王洋陈泽伟杨俊朱春奎温惠康曹彪邹宏江刘水养
Owner DONGGUAN CHUANGMING BATTERY TECH
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