Lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and batteries, which is applied in the field of lithium-ion batteries, can solve problems such as battery performance deterioration, increased production costs, and wall rupture, achieving both safety and electrical performance, and the effect of controlling manufacturing costs

Inactive Publication Date: 2020-08-25
ZHUHAI COSMX POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this kind of package has achieved the effect of preventing battery spontaneous combustion and improving battery safety performance, the package wall of the package will inevitably age during long-term use, which will cause the package wall of the package to break and release the flame retardant substance. into the cell, resulting in deterioration of the performance of the cell
Moreover, the packaging package is different from the aluminum-plastic film packaging of conventional batteries, which increases the production process and increases the production cost

Method used

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  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0030] The preparation process of lithium-ion batteries mainly includes the preparation of pole pieces, preparation of batteries, packaging, liquid injection, chemical formation and other processes. After the positive and negative electrodes are prepared, the positive electrode, negative electrode and separator are laminated or wound to make a bare cell (cell body), and then the cell body is packaged with aluminum-plastic film and other packaging films. Then inject the electrolyte into the packaged cell body. After the lithium-ion battery is packaged, an air bag will be set on one side of the cell body, and the air bag is connected to the cell body. When injecting liquid, the electrolyte is injected into the cell body from the opening of the air bag. After the liquid injection is completed, a certain amount of gas will be generated inside the cell body during the formation process, and the gas will enter the air bag. The existing lithium-ion battery preparation process will p...

Embodiment 1

[0036] The preparation method of the lithium-ion battery of the present embodiment comprises the following steps:

[0037] Preparation of positive electrode sheet: use ternary nickel-cobalt-manganese NCM111 as the positive electrode active material, disperse the positive electrode active material, binder (PVDF) and conductive agent (conductive carbon black) in N-methylpyrrolidone, and prepare a uniform positive electrode slurry The content of each solid material in the positive electrode slurry is as follows: NCM111 is 96wt%, PVDF is 2wt%, and conductive carbon black is 2wt%; the positive electrode slurry is evenly coated on both sides of the aluminum foil, and dried at 90 to 130°C for 6 Hours later, compact with a roller press to obtain the positive electrode sheet;

[0038] Prepare the negative electrode sheet: use graphite as the negative electrode active material, mix and disperse the negative electrode active material and binder (styrene-butadiene rubber), thickener (sodi...

Embodiment 2

[0045] The difference between this example and Example 1 is that: NCM523 is used as the positive electrode active material, and the rest of the steps and parameters are the same.

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Abstract

The invention discloses a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a battery cell body and a flame-retardant safety bag connected with the battery cell body, wherein the flame-retardant safety bag and the battery cell body are isolated from each other through a first sealing area, and the flame-retardant safety bag is filled with flame-retardant liquid. The air bag of the battery cell is refitted into the flame-retardant safety bag, the flame-retardant liquid is added into the flame-retardant safety bag, the flame-retardant safety bag and the battery cell body are separated by the seal on the aluminum-plastic film in a normal state, and the flame-retardant liquid cannot flow into the battery cell body; when gas is generated in the battery cellbody due to high temperature, the internal pressure of the battery cell is increased, and the seal on the aluminum-plastic film is cracked, the flame-retardant liquid in the flame-retardant safety bag can flow into the battery cell body, so that a flame-retardant function is achieved, the battery cell is prevented from being on fire at high temperature, or a battery already on fire is extinguished, and self-extinguishing is realized.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery capable of preventing battery spontaneous combustion and a preparation method thereof. Background technique [0002] With the intensification of the energy crisis and the deterioration of the natural environment, the application of lithium-ion batteries in the fields of electric vehicles and energy storage equipment is becoming more and more common, and the safety performance of lithium-ion batteries is also receiving more and more attention. The use of lithium-ion batteries in high-temperature environments or thermal runaway caused by overcharging and over-discharging may lead to safety accidents such as spontaneous combustion and explosion of lithium-ion batteries, which seriously restricts the promotion of lithium-ion batteries in the field of new energy. [0003] In order to ensure the safety of use, especially the safety of lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M2/02A62C2/06A62C3/16A62C31/00
CPCA62C2/06A62C3/16A62C31/00H01M10/0525H01M10/058H01M2200/00H01M2220/20H01M50/10Y02E60/10Y02P70/50
Inventor 叶璐
Owner ZHUHAI COSMX POWER CO LTD
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