Formation method for soft package lithium ion battery

A technology of lithium-ion batteries and chemical formation methods, which is applied in the field of soft-pack lithium-ion battery manufacturing, can solve the problems of poor consistency of SEI film formation, etc., and achieve the effects of improving the consistency of electrical properties and cycle life, improving penetration, and smooth appearance

Active Publication Date: 2018-09-21
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for the formation of soft-packed lithium-ion batteries

Method used

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  • Formation method for soft package lithium ion battery
  • Formation method for soft package lithium ion battery
  • Formation method for soft package lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] The formation method of the soft-packed lithium ion battery of this embodiment adopts the following steps:

[0022] 1) Put the battery to be formed on the high-temperature pressurization forming equipment, keep the temperature of the battery core at 40°C, and the surface pressure on both sides of the battery core is 0.4Mpa, first use a constant current of 0.01C to charge to the first cut-off voltage 2.8V, then use a constant current of 0.1C to charge to the second cut-off voltage of 3.5V, and then use a constant current of 0.5C to charge to the initial cut-off voltage of 3.65V;

[0023] 2) Under the condition of room temperature and no surface pressure, use 0.1C current to charge with constant current and constant voltage until the set cut-off voltage is 4.0V, cut-off current is 0.01C, and the formation is over;

[0024] 3) Aging the battery after chemical conversion at 45°C for 36h.

Example Embodiment

[0025] Example 2

[0026] The formation method of the soft-packed lithium ion battery of this embodiment adopts the following steps:

[0027] 1) Place the battery to be formed on the high-temperature pressurization forming equipment, keep the cell temperature at 60℃, and the surface pressure on both sides of the cell is 0.7Mpa, first charge it to the first cut-off voltage with a constant current of 0.05C 2.8V, then use a constant current of 0.3C to charge to the second cut-off voltage of 3.5V, and then use a constant current of 1.0C to charge to the initial cut-off voltage of 3.65V;

[0028] 2) Under the condition of room temperature and no surface pressure, use 0.2C current constant current and constant voltage to charge until the set cut-off voltage is 4.0V, cut-off current is 0.02C, and the formation is over;

[0029] 3) Aging the battery after chemical conversion at 50°C for 24h.

Example Embodiment

[0030] Example 3

[0031] The formation method of the soft-packed lithium ion battery of this embodiment adopts the following steps:

[0032] 1) Place the battery to be formed on the high-temperature pressurization forming equipment, keep the cell temperature at 70℃, and the surface pressure on both sides of the cell is 1.0Mpa, first use 0.1C constant current to charge to the first cut-off voltage 2.8V, then use 0.5C constant current to charge to the second cut-off voltage 3.5V, and then use 2.0C constant current to charge to the initial cut-off voltage of 3.65V;

[0033] 2) Under the condition of room temperature and no surface pressure, use 0.5C current constant current and constant voltage to charge until the set cut-off voltage is 4.0V, cut-off current is 0.05C, and the formation is over;

[0034] 3) Aging the battery after chemical conversion at 60°C for 12h.

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Abstract

The invention relates to a formation method for a soft package lithium ion battery. The formation method comprises the steps that under the circumstances that the temperature is higher than the indoortemperature, and surface pressure is applied to the two side surfaces of the battery, current of 0.01 C-2 C is adopted for performing constant current charge on the battery to the initial cut-off voltage; according to the formation method, charging formation is carried out under the circumstances that the temperature is higher than the indoor temperature, and the surface pressure is applied, temperature and surface pressure changes can be conveniently utilized to improve permeation and infiltration of electrolyte for electrode materials, timely remove gas generated from the electrode surfacefilm formation reaction, and reduce current distribution differences of the electrode surface, thereby improving the consistence of the precharge formation interface and improving the electrical performance consistence and circular life of the battery.

Description

technical field [0001] The invention belongs to the field of manufacturing soft-pack lithium-ion batteries, and in particular relates to a method for forming soft-pack lithium-ion batteries. Background technique [0002] In recent years, the demand for soft-pack lithium-ion batteries has been increasing, and they have been widely used in notebook computers, smart phones, tablet computers, cameras, electric bicycles, electric vehicles, and military and defense fields. With the increasing market demand, manufacturers have higher and higher requirements for the production efficiency and production quality of soft-pack lithium-ion batteries. [0003] Lithium-ion battery formation refers to the process of charging a lithium-ion battery for the first time in order to make the battery electrochemically active. Formation is to form a layer of solid electrolyte interfacial film (SEI film) on the surface of the negative electrode. The SEI film has the properties of a solid electrolyt...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 高红艳许飞赵永锋李云峰王攀赵红娟刘兴丹谭倩尼亚琼朱林剑
Owner DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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