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Lithium ion battery and preparation method thereof

A lithium-ion battery and cell technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve problems such as affecting the initial efficiency and capacity of the battery, and increasing side reactions.

Inactive Publication Date: 2022-01-28
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the temperature or prolonging the high-temperature soaking time of the battery will increase the side reactions in the later stage, which will affect the first-time efficiency and capacity of the battery.

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
Comparison scheme
Effect test

Embodiment 1

[0060] A preparation method for a lithium ion battery, comprising the following steps:

[0061] 1. Preparation of positive electrode sheet

[0062] (1) Preparation of positive electrode slurry: LiFePO 4 , the conductive agent SP, and the binder PVDF were mixed according to the ratio of 93.0-96.0:2.0-5.0:2.0-4.0, and a solvent was added to mix evenly to obtain the positive electrode slurry.

[0063] (2) Coating: The positive electrode slurry obtained above was evenly coated on the aluminum foil with a coating machine, dried in an oven, then transferred to a vacuum drying oven for further drying and stored for later use.

[0064] (3) Roll pressing, slitting and die-cutting: cold press or hot press the above-mentioned dried positive electrode sheet, and then slitting, die-cut the slit positive electrode sheet, and choose the die-cutting method of the positive electrode sheet to be stacked One of the way and the winding way.

[0065] 2. Preparation of negative electrode sheet ...

Embodiment 2

[0072] A preparation method for a lithium ion battery, comprising the following steps:

[0073] 1. Preparation of positive electrode sheet

[0074] (1) Preparation of positive electrode slurry: LiNi 0.6 mn 0.4 o 2 , the conductive agent SP, and the binder PVDF were mixed according to the ratio of 93.0-96.0:2.0-5.0:2.0-4.0, and a solvent was added to mix evenly to obtain the positive electrode slurry.

[0075] (2) Coating: The positive electrode slurry obtained above was evenly coated on the aluminum foil with a coating machine, dried in an oven, then transferred to a vacuum drying oven for further drying and stored for later use.

[0076] (3) Roll pressing, slitting and die-cutting: cold press or hot press the above-mentioned dried positive electrode sheet, and then slitting, die-cut the slit positive electrode sheet, and choose the die-cutting method of the positive electrode sheet to be stacked One of the way and the winding way.

[0077] 2. Preparation of negative elec...

Embodiment 3

[0084] A preparation method for a lithium ion battery, comprising the following steps:

[0085] 1. Preparation of positive electrode sheet

[0086] (1) Preparation of positive electrode slurry: LiNi 0.6 co 0.2 mn 0.2 o 2 , the conductive agent SP, and the binder PVDF were mixed according to the ratio of 93.0-96.0:2.0-5.0:2.0-4.0, and a solvent was added to mix evenly to obtain the positive electrode slurry.

[0087] (2) Coating: The positive electrode slurry obtained above was evenly coated on the aluminum foil with a coating machine, dried in an oven, then transferred to a vacuum drying oven for further drying and stored for later use.

[0088] (3) Roll pressing, slitting and die-cutting: cold press or hot press the above-mentioned dried positive electrode sheet, and then slitting, die-cut the slit positive electrode sheet, and choose the die-cutting method of the positive electrode sheet to be stacked One of the way and the winding way.

[0089] 2. Preparation of negat...

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Abstract

The invention discloses a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a cell pole group, a transmission assembly and a shell, wherein the top end of the cell pole group is provided with a liquid injection hole, and the liquid injection hole is used for injecting electrolyte; the shell is positioned on the outer side of the battery core pole group; the transmission assembly is positioned between the battery core pole group and the shell; the transmission assembly comprises at least one hollow pipe, and the central axis of the hollow pipe is parallel to the side edge of the battery cell pole group. Therefore, the electrolyte can infiltrate the hollow pipe, and due to the capillarity, the downward transmission height of the electrolyte inside the hollow pipe is larger than the downward transmission height of the electrolyte outside the hollow pipe. The infiltration time of the battery cell pole group can be shortened, and the wettability of the lithium ion battery electrolyte is improved. Besides, when the lithium ion battery is heated to generate more gas inside, the hollow pipe can transmit the pressure to each part of the battery cell, so that the problem of overlarge local pressure inside the battery is avoided, and the safety of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the field of battery technology, and in particular relates to a lithium ion battery and a preparation method thereof. Background technique [0002] At present, the liquid lithium-ion battery (Liquified Lithi μm-Ion Battery, referred to as LIB) in the lithium-ion battery still occupies the mainstream of this market. Among many batteries such as lead-acid batteries and solar batteries, lithium-ion batteries have many advantages such as higher energy density, lighter weight, and better safety performance, and have been widely used in mobile phones, tablet computers, wearable products, electric bicycles, electric vehicles, etc. In the field of digital batteries and power batteries. [0003] Consumers generally value the capacity of lithium-ion batteries, expecting them to be small and have the longest battery life. At present, the cost of lithium-ion batteries is relatively high, especially the proportion of the cost of power veh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/627H01M50/682H01M10/058H01M10/0525
CPCH01M50/627H01M50/682H01M10/058H01M10/0525Y02E60/10Y02P70/50
Inventor 王海龙史童男贾永强李树人杨超刘鑫张晓栋
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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