Formation method of soft-packed lithium ion battery

A technology of lithium-ion batteries and ion batteries, which is applied in the field of formation of soft-packed lithium-ion batteries, can solve problems such as battery flatulence, small lithium titanate particles, and hidden dangers of battery safety, so as to avoid gas residues, promote reactions, and achieve high compactness. degree of effect

Inactive Publication Date: 2014-01-15
SHENZHEN HAIYING TECH
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Problems solved by technology

[0007] However, lithium titanate has small particles and is easy to absorb water, so it is easy to absorb a large amount of water during the manufacturing process of the battery, and the residual water will chemically react with the electrolyte, causing the battery to be flattened, which brings great difficulties to the safe use of the battery. big hidden danger
This also restricts the wide application of lithium titanate in power lithium-ion batteries

Method used

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  • Formation method of soft-packed lithium ion battery

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Effect test

Embodiment 1

[0028] This embodiment provides a method for forming a soft-packed lithium-ion battery after liquid injection and sealing, see figure 1 As shown, the method mainly includes the following processes:

[0029] Step 101: pre-charging with ultra-low current.

[0030] The lithium-ion battery behind the liquid-filled sealed case is charged to a predetermined less-full-charge state with the first charging current. For example, the lithium-ion battery can be precharged with an ultra-low current of any rate of 0.3-0.05 until the capacity of the lithium-ion battery reaches about 60-70% of the total capacity.

[0031] In the test of this embodiment, the inventor specifically charged the lithium-ion battery with a current of 0.05 times for 260 minutes, so that its capacity reached 30% of the total capacity.

[0032] In this embodiment, the use of the ultra-low current charging is beneficial to slow down the reaction between the internal electrode material and the electrolyte of the lithi...

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Abstract

The invention relates to the field of lithium batteries and discloses a formation method of a soft-packed lithium ion battery. The formation method comprises the following steps: charging to be in a preset non-full state by ultra-low current and standing; continuously charging till to be in a full state by low current and standing; carrying out vacuum and heat sealing on a shell and remaining a first air bag; discharging the lithium ion battery to be in a discharging cut-off voltage state; continuously charging till to be in a charging cut-off voltage state, charging till to be in a charging cut-off current state by constant voltage and standing; discharging till to be in a discharging cut-off voltage state; charging till to be in the charging cut-off voltage state by constant current, charging till the current is reduced to the charging cut-off current by the constant voltage and standing; vacuumizing, carrying out vacuum heat sealing on the shell, and shearing the first air bag and a second air bag to obtain the lithium ion battery packed in a second sealing cavity body. The formation method is beneficial to preventing the inflation problem of the lithium ion battery in the application process.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for forming soft-pack lithium-ion batteries. Background technique [0002] Lithium secondary battery is a new type of chemical power source, which is mainly composed of positive electrode, battery separator, negative electrode, electrolyte and shell. When a lithium-ion battery is working, lithium ions can be intercalated and deintercalated between the positive active material and the negative active material. [0003] Due to the advantages of high working voltage, high specific energy density, long cycle life, low self-discharge rate, no memory effect and low environmental pollution, lithium secondary batteries are widely used in communication equipment, mobile electronic equipment, electric tools, electric toys and aircraft models. It has been rapidly applied and popularized. In recent years, power lithium secondary batteries have gradually been applied in large-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 陶芝勇郭永兴曾纪术曾坚义
Owner SHENZHEN HAIYING TECH
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