Unlock instant, AI-driven research and patent intelligence for your innovation.

Formation method for improving cycle performance of narrow strip-shaped flexible package lithium ion battery

A lithium-ion battery and a technology of a chemical formation method, applied in the field of lithium-ion batteries, can solve problems such as bulging failure, and achieve the effects of reducing bulging deformation, improving cycle performance, and increasing positive electrode infiltration.

Inactive Publication Date: 2022-04-12
山东聚信新能源科技有限公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the cycle performance failure problem of existing high-energy-density narrow-strip flexible-packaged lithium-ion batteries, the present invention provides a chemical formation method for improving the cycle performance of narrow-strip-shaped flexible-packaged lithium-ion batteries, which can effectively release material stress and increase the number of positive and negative pole pieces The degree of fit with the separator can improve the consistency of the battery interface, avoid the failure of the top and bottom drums caused by the high deformation and rebound of the negative electrode material used by consumers, and can greatly increase the liquid retention of the battery, thereby improving the high energy density. Cycling performance of narrow-strip flexible-packaged lithium-ion batteries

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Formation method for improving cycle performance of narrow strip-shaped flexible package lithium ion battery
  • Formation method for improving cycle performance of narrow strip-shaped flexible package lithium ion battery
  • Formation method for improving cycle performance of narrow strip-shaped flexible package lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the high-temperature pressurized formation cabinet, the narrow strip-shaped flexible packaging lithium-ion battery is formed, the formation temperature is 70°C, and the formation pressure is 10kgf / cm 2 , the specific process steps are as follows:

[0029] S1. Conventional formation stage:

[0030] (1) 0-3.5V SEI film formation: use 0.1C small current constant current charge formation;

[0031] (2) 3.5-3.8V charging: use 0.3C current constant current charging to form;

[0032] S2, fully charged formation stage:

[0033] 3.8-4.35V charging: use 0.7C high-current constant-current constant-voltage charging formation, the charging cut-off voltage is the cut-off voltage of 4.35V designed by the battery, and the charging cut-off current is 0.25C;

[0034] S3. Respiratory formation stage:

[0035] Three breath-type charge-discharge cycles are performed, and each breath-type charge-discharge cycle includes a constant current discharge step and a constant current constant ...

Embodiment 2

[0039] The narrow strip-shaped flexible packaging lithium-ion battery is formed in a high-temperature pressurized formation cabinet, the formation temperature is 80°C, and the formation pressure is 10kgf / cm 2 , the specific process steps are as follows:

[0040] S1. Conventional formation stage:

[0041] (1) 0-3.5V SEI film formation: use 0.1C small current constant current charge formation;

[0042] (2) 3.5-3.8V charging: use 0.2C current constant current charging to form;

[0043] S2, fully charged formation stage:

[0044] 3.8-4.45V charging: Use 0.5C high current, constant current and constant voltage charging formation, the charging cut-off voltage is the cut-off voltage of 4.45V designed by the battery, and the charging cut-off current is 0.15C;

[0045] S3. Respiratory formation stage:

[0046]Three breath-type charge-discharge cycles are performed, and each breath-type charge-discharge cycle includes a constant current discharge step and a constant current constant...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
retention rateaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a formation method for improving the cycle performance of a narrow-strip-shaped flexible package lithium ion battery, specifically, a battery formed to 3.8-4.0 V is subjected to formation, the formation method comprises a full-charge formation stage and a breathing type formation stage, in the full-charge formation stage, a current of 0.5-1.5 C is used for constant-current and constant-voltage charging, and in the breathing type formation stage, the cycle performance of the narrow-strip-shaped flexible package lithium ion battery is improved. The breathing type formation stage comprises at least one breathing type charging and discharging cycle, and each breathing type charging and discharging cycle comprises a constant-current discharging step and a constant-current and constant-voltage charging step which are carried out in sequence. The formation method provided by the invention can effectively release material stress, increase the fitting degree of the positive and negative pole pieces and the diaphragm, improve the consistency of battery interfaces, avoid the problems of capacity grading and top and bottom bulging and failure caused by high deformation rebound of the negative pole material used by consumers, and can greatly improve the liquid retention capacity of the battery; therefore, the cycle performance of the high-energy-density narrow-strip-shaped flexible package lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a formation method for improving the cycle performance of narrow-strip flexible-packaged lithium-ion batteries. Background technique [0002] At present, for digital products such as mobile phones, notebook computers, and tablet computers, the most widely used batteries in the industry are soft-packed lithium-ion batteries with coiled tabs embedded in them. Manufactured by winding, the soft-packaged lithium-ion battery with a finished battery width of ≤50mm and an aspect ratio of ≥1.5 is generally called a narrow-strip flexible-packaged lithium-ion battery. [0003] Electrode formation is a key process that affects the final performance of the battery. Since the pole piece is embedded with a certain thickness of current collector (digital products are usually copper strips and aluminum strips with a thickness of 0.06-0.1mm), different regions of the pole group will...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/058H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 黄磊周朕良张妍王艳飞郭大利刘玉涛刘通
Owner 山东聚信新能源科技有限公司