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Lithium ion battery and production method thereof

A lithium-ion battery and cell technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of reducing battery energy density, increasing the proportion of inactive substances, increasing costs, etc. The effect of reducing heat temperature and facilitating heat dissipation

Inactive Publication Date: 2018-01-26
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: increasing the proportion of inactive materials, reducing the energy density of the battery and increasing the cost

Method used

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  • Lithium ion battery and production method thereof
  • Lithium ion battery and production method thereof
  • Lithium ion battery and production method thereof

Examples

Experimental program
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Embodiment 1

[0034] Such as figure 1 , figure 2 As shown, a lithium-ion battery described in this embodiment includes a casing, a laminated core body in the casing, and an electrolyte filled in the casing. The laminated core body includes a positive electrode sheet, a negative electrode sheet, and is attached to the positive electrode. The composite diaphragm between the negative electrode sheet and the positive electrode sheet and the negative electrode sheet are provided with round holes.

[0035] The positive electrode sheet and the negative electrode sheet are composed of positive and negative electrode current collectors and positive and negative electrode powder materials bonded to them respectively. The positive electrode active material used in the positive electrode material is LiFePO4, and the ratio of each component of the positive electrode material is: positive electrode active material 95.5%, 2.0% conductive carbon black, and 2.5% polyvinylidene fluoride, mixed evenly and e...

Embodiment 2

[0038] Such as figure 1 , figure 2 Shown, the preparation method of a kind of lithium-ion battery described in this embodiment comprises the following steps:

[0039] Step S1, positive electrode sheet production: mix the positive electrode powder material in NMP solvent according to the conventional process to make positive electrode slurry, evenly coat the positive electrode slurry on the 15um carbon-coated aluminum foil current collector, and cold press after baking , the compacted density is 2.20g / cm3, and the thickness of the pole piece is 170μm. Then die-cut the positive electrode sheet to obtain a finished positive electrode sheet with a size of 208mm×233.5mm and a diameter of the middle opening of Φ=4mm;

[0040] Step S2, negative electrode production: mix the negative electrode material in the CMC glue according to the conventional process, add the SBR binder to make the negative electrode slurry, evenly coat the negative electrode slurry on the 10um copper foil cur...

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Abstract

The invention discloses a lithium ion battery and a production method thereof. A positive electrode plate and a negative electrode plate are respectively provided with circular holes to facilitate heat dissipation of the lithium ion battery, so the produced heat temperature of a battery cell main body is obviously reduced in the continuous 3C charge and discharge process, the cycle life of the battery is prolonged, and the heat reduction purpose of the high-capacity lithium ion power battery is met from the structure design of the electrode plates.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery and a preparation method thereof. Background technique [0002] Due to its high energy density, high operating voltage, no memory effect, and long cycle life, lithium-ion batteries have attracted much attention since their commercialization. Especially in the current blowout of new energy vehicles, communication base stations, energy storage base stations and household energy storage and other fields have been widely used. [0003] Due to the rapid development of large-capacity power lithium-ion batteries, the safety of thermal effects of batteries has become a bottleneck in the pursuit of superior battery rate performance goals, and safety performance has always been the foundation, focus and foothold of the industry. We know that the maximum operating temperature of a lithium-ion battery is about 60°C, and the use of the battery under over...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/136H01M4/133H01M10/0525H01M10/058H01M10/613H01M10/654H01M10/655
CPCY02E60/10Y02P70/50
Inventor 陈怀胜余开明陈小平任超李小兵
Owner 桑顿新能源科技(长沙)有限公司