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A kind of formation method of flexible packaging lithium ion battery

A technology of lithium-ion battery and chemical formation method, which is applied in the field of lithium-ion battery preparation, can solve the problems of large internal stress of electrode active material particles, affecting battery performance, etc., achieve centralized distribution of inventory, relieve internal stress and pore compression, and improve cycle life Enhanced effect

Active Publication Date: 2020-07-31
FENGFAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the process time and improve the formation effect, the industry began to optimize the pressure, temperature and charge and discharge system of the formation. At present, methods such as increasing the temperature, increasing the pressure, and increasing the current are generally used to improve the formation effect, thereby improving battery performance. However, the pressure in the formation process is constant at the same step
As the formation and charging progress, most of the active material particles on the lithium-ion battery pole piece, such as the carbon-based active material particles on the negative electrode piece, will continue to expand in volume, and the pores containing the electrolyte inside the porous electrode will be compressed. The internal stress between the particles will also increase, which will affect the performance of the battery

Method used

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  • A kind of formation method of flexible packaging lithium ion battery
  • A kind of formation method of flexible packaging lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 500 soft-pack lithium batteries 06161227 and use the pulse pressure of the present invention to form:

[0026] After filling the lithium battery, let it stand at room temperature for 12 hours, then let it stand at 45°C for 4 hours; set the formation temperature at 45°C, heat the high-temperature pressure formation fixture until the surface temperature reaches 45°C, and set the initial pressure of the fixture to 0.3MPa , clamp the lithium battery; apply pulse pressure to the fixture, set the pressure generation waveform parameters: the waveform is trapezoidal wave, the minimum pressure value is 0.3MPa, the maximum pressure value is 0.6MPa, the pressure rise time is 3s, and the pressure maintenance time is 4s, the pressure reduction time is 8s, after 15 minutes of pulse pressure massage on the battery, when the last waveform is completed, the pressure massage on the battery is completed, the clamp pressure is linearly increased to 0.4MPa, and the high temperature pres...

Embodiment 2

[0028] After filling the soft-packed lithium battery 05161227, let it stand at room temperature for 12 hours, then let it stand at 45°C for 4 hours; set the formation temperature at 45°C, heat the high-temperature pressure formation fixture until the surface temperature reaches 45°C, and set the initial pressure of the fixture to 0.2MPa, clamp the lithium battery; apply pulse pressure to the fixture, set the pressure generation waveform parameters: the waveform is a half-sine wave, the minimum pressure value is 0.2MPa, the maximum pressure value is 0.6MPa, and the single pulse time is 30s. After the battery has undergone pulse pressure massage for 20 minutes, when the last waveform is completed, the pressure massage on the battery is completed, the clamp pressure is linearly increased to 0.7MPa, and the high temperature pressure is turned into A- the first small current charge, 0.05C constant current charge to the end The voltage is 3.25V; the fixture voltage is linearly decomp...

Embodiment 3

[0030] After filling the soft-packed lithium battery 05161227, let it stand at room temperature for 12 hours, then let it stand at 45°C for 4 hours; set the formation temperature at 45°C, heat the high-temperature pressure formation fixture until the surface temperature reaches 45°C, and set the initial pressure of the fixture to 0.2MPa, clamp the lithium battery; apply pulse pressure to the fixture, set the pressure generation waveform parameters: the waveform is a triangular wave, the lowest pressure value is 0.2MPa, the highest pressure value is 0.8MPa, the pressure rise time is 15s, and the pressure drop time After 15 minutes of pulse pressure massage on the battery, when the last waveform is completed, the pressure massage on the battery is completed, the clamp pressure is linearly increased to 0.5MPa, and the high temperature pressure is turned into A- the first small current charge, 0.05C constant Current charging until the cut-off voltage is 3.25V; linearly decompress t...

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Abstract

A method for the formation of soft-packed lithium-ion batteries, aging of lithium batteries; setting the temperature and initial pressure of the fixture, clamping the battery; performing pulse pressure massage on the battery: setting the pressure of the fixture to change in pulse form, and the cut-off time is 2‑20min, Perform pulse pressure massage on the battery. When the cut-off time is reached and the pressure change of the fixture completes the last waveform, the pressurized massage is completed, and the pressure of the fixture is linearly increased or decompressed to the initial voltage of the next step; the high temperature pressure is converted into A, and the fixture Constant pressure, constant current charging; high temperature pressure into B: set the fixture pressure to pulse and change, constant current charging; high temperature pressure into C; switch the battery after cycle charging to the pressurized cooling fixture, pressurized cooling and finalization. The invention can achieve the effects of shortening the process time, improving the chemical formation effect, increasing the hardness of the soft-package battery and the electrolyte retention, and improving the performance of the cycle battery.

Description

technical field [0001] The invention relates to a method for forming a soft-pack lithium-ion battery, belonging to the technical field of lithium-ion battery preparation. Background technique [0002] Lithium-ion batteries are widely used as power sources for digital products and vehicles due to their unique advantages of high working voltage, high energy density, long cycle life, low self-discharge, no memory effect, and no pollution. Among them, flexible packaging batteries, due to the use of aluminum-plastic film and their design features, have higher energy density and power density, and their proportion in the production and sales of lithium-ion batteries is increasing. [0003] Formation is one of the key processes of lithium-ion batteries. During the process of formation, a layer of solid electrolyte interfacial film is formed on the surface of the electrode material, which directly determines the performance of the battery such as rate and cycle. For soft-pack lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 国海鹏顾志华石琛赵静韩小勇
Owner FENGFAN