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Lithium-ion battery and parallel formation method thereof

A lithium-ion battery and formation method technology, which is applied in secondary batteries, electrochemical generators, secondary battery repair/maintenance, etc., can solve the problem of not being able to adapt to the battery delivery cycle well, increasing the formation time of lithium-ion batteries, It is impossible to guarantee the effective discharge of gas and other issues, so as to improve the formation efficiency and cycle performance of the battery, ensure the consistency of infiltration, and achieve the effect of feasibility

Active Publication Date: 2022-07-15
HUIZHOU HENGTAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, with the rapid development of the lithium-ion battery industry, the market demand for lithium-ion batteries is increasing. Traditional lithium-ion batteries tend to produce more gas under high-current formation conditions, which cannot guarantee the formation process. The gas is effectively discharged, which affects the various properties of the lithium-ion battery. Therefore, it is necessary to make the lithium-ion battery be formed under a small current, which greatly increases the formation time of the lithium-ion battery, and the traditional lithium-ion battery formation method It is difficult to control the parameters of simultaneous formation of multiple lithium-ion batteries, which cannot be well adapted to the battery delivery cycle

Method used

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  • Lithium-ion battery and parallel formation method thereof
  • Lithium-ion battery and parallel formation method thereof
  • Lithium-ion battery and parallel formation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] Record the initial high temperature standing time by spraying the code on the battery cell that has been filled with liquid;

[0144] After the resting time is completed, scan the code, and the qualified static cells will be transferred to the formation process to be formed in a high-temperature formation cabinet, and the unqualified static cells will continue to be put on hold;

[0145] Fix the stationary cells in sequence with a clamp, and connect each stationary cell side by side in parallel;

[0146] Parallel charging of stationary cells;

[0147] The current conditions, temperature, time and pressure of each stage are as follows:

[0148] Stage 1: 0.2 C, 40°C, 5min and 2.2N / cm 2 ;

[0149] Second stage: 0.4C, 60℃, 10min and 2.9 N / cm 2 ;

[0150] The third stage: 0.6C, 70℃, 25min and 3.5N / cm 2 ;

[0151] Fourth stage: 0.2 C, 35°C, 35min and 2.4N / cm 2 ;

[0152] Air-pumping and encapsulation is performed on the static cells after each formation.

Embodiment 2

[0154] Record the initial high temperature standing time by spraying the code on the battery cell that has been filled with liquid;

[0155] After the resting time is completed, scan the code, and the qualified static cells will be transferred to the formation process to be formed in a high-temperature formation cabinet, and the unqualified static cells will continue to be put on hold;

[0156] Fix the stationary cells in turn with fixtures, and connect each stationary cell side by side in parallel;

[0157] Parallel charging of stationary cells;

[0158] The current conditions, temperature, time and pressure of each stage are as follows:

[0159] First stage: 0.25 C, 45°C, 4min and 2.0 N / cm 2 ;

[0160] Second stage: 0.45C, 65°C, 8 min and 2.7 N / cm 2 ;

[0161] Stage 3: 0.65C, 75°C, 20 min and 3.2 N / cm 2 ;

[0162] Fourth stage: 0.3C, 40℃, 40 min and 2.2N / cm 2 ;

[0163] Air-pumping and encapsulation is performed on the static cells after each formation.

Embodiment 3

[0165] Record the initial high temperature standing time by spraying the code on the battery cell that has been filled with liquid;

[0166] After the resting time is completed, scan the code, and the qualified static cells will be transferred to the formation process to be formed in a high-temperature formation cabinet, and the unqualified static cells will continue to be put on hold;

[0167] Fix the stationary cells in turn with fixtures, and connect each stationary cell side by side in parallel;

[0168] Parallel charging of stationary cells;

[0169] The current conditions, temperature, time and pressure of each stage are as follows:

[0170] Stage 1: 0.3 C, 50°C, 3 min and 2.4N / cm 2 ;

[0171] Second stage: 0.5C, 70°C, 6 min and 3.1 N / cm 2 ;

[0172] Stage 3: 0.7C, 80°C, 15 min and 3.7N / cm 2 ;

[0173] Fourth stage: 0.4C, 45℃, 45min and 2.0 N / cm 2 ;

[0174] Air-pumping and encapsulation is performed on the static cells after each formation.

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Abstract

The present application provides a lithium ion battery and a parallel formation method thereof. The above-mentioned parallel formation method of lithium ion batteries includes obtaining the cells that have been injected with liquid; performing coding processing on the cells; performing a shelving operation on the cells after the coding processing to obtain stationary cells; The parallel connection operation is performed to obtain a battery cell group; the step-by-step formation operation is performed on the battery cell group by using a predetermined current to obtain a lithium ion battery. The above-mentioned parallel formation method of lithium ion batteries enables faster formation speed and higher formation efficiency of lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium ion battery and a parallel formation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery or rechargeable battery, which mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to work. During the charging and discharging process, Li+ is intercalated and deintercalated back and forth between the two electrodes. During charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; during discharge, the opposite is true. Lithium-ion batteries generally use materials containing lithium as electrodes, which are the representative of modern high-performance batteries. They play a very important role in all aspects of modern social life, such as consumer products, di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/441H01M10/446H01M10/0525Y02E60/10
Inventor 戴建勇刘东凤刘志伟曾贤华
Owner HUIZHOU HENGTAI TECH