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Lithium ion battery and its making method

A lithium-ion battery and battery technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve the problems of poor safety performance and low qualification rate, and achieve the effect of avoiding short circuits and high safety.

Inactive Publication Date: 2007-08-01
BYD 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 overcome the defects of poor safety performance and low pass rate of existing lithium-ion batteries and provide a lithium-ion battery with good safety performance and high pass rate and its preparation method

Method used

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  • Lithium ion battery and its making method
  • Lithium ion battery and its making method
  • Lithium ion battery and its making method

Examples

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preparation example Construction

[0029] The preparation method of the positive electrode can adopt conventional preparation methods. For example, the positive electrode can be obtained by mixing the positive electrode active material, conductive agent and binder with a solvent, coating and / or filling on the current collector, drying, and calendering or not. Wherein, the solvent can be selected from N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), dimethylsulfoxide (DMSO), tetrahydrofuran (THF) and water and one or more of alcohols. The amount of the solvent can make the paste have viscosity and fluidity, and can be coated on the current collector. Generally, based on the weight of the positive electrode active material, the content of the solvent is 30-80% by weight, preferably 35-60% by weight. Wherein, the methods and conditions of drying and calendering are well known to those skilled in the art.

[0030]The separator is arranged between the positive electrode and the negative...

Embodiment 1

[0045] This example illustrates the preparation of lithium ion batteries provided by the present invention.

[0046] (1) Preparation of positive electrode

[0047] 100 g of the positive active ingredient LiCoO 2 2. 2 grams of binder polyvinylidene fluoride (PVDF) and 3.2 grams of conductive agent acetylene black were added to 40 grams of water, and then stirred in a vacuum mixer to form a uniform positive electrode slurry.

[0048] The slurry was evenly coated on an aluminum foil, then dried at 150°C, rolled, and cut to obtain a positive electrode with a size of 540×43.5 mm, which contained 5.8 grams of active ingredient LiCoO 2 .

[0049] (2) Preparation of negative electrode

[0050] 100 grams of negative active ingredient natural graphite, 1 gram of binder polytetrafluoroethylene (PTFE), and 4 grams of conductive agent carbon black were added to 120 grams of water, and then stirred in a vacuum mixer to form a uniform negative electrode slurry.

[0051] The slurry was un...

Embodiment 2

[0058] This example illustrates the preparation of lithium ion batteries provided by the present invention.

[0059] (1) Preparation of positive electrode

[0060] 100 g of the positive active ingredient LiCoO 2 2. 2 grams of binder polyvinylidene fluoride (PVDF) and 3.2 grams of conductive agent acetylene black were added to 40 grams of water, and then stirred in a vacuum mixer to form a uniform positive electrode slurry.

[0061] The slurry was evenly coated on aluminum foil, then dried at 150°C, rolled, and cut to obtain a positive electrode with a size of 540×43.5 mm, which contained 5.8 grams of active ingredient LiCoO 2 .

[0062] (2) Preparation of negative electrode

[0063] 100 grams of negative active ingredient natural graphite, 1 gram of binder polytetrafluoroethylene (PTFE), and 4 grams of conductive agent carbon black were added to 120 grams of water, and then stirred in a vacuum mixer to form a uniform negative electrode slurry.

[0064] The slurry was unifo...

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Abstract

A lithium ion cell, the cell includes electric core and printed circuit board which is connected with the electric core, said electric core and printed circuit board which is connected with the electric core are sealed in the cell shell, said electric core includes electrode group which comprises anode, cathode and septum, electrolyte and core shell, said electrode group and electrolyte are sealed into the core shell, said printed circuit board includes touching piece, thereinto, the surface of said printed circuit board includes a layer of waterproof insulated glue. The safety of lithium ion cell is high, quality is perfect and the eligibility ratio of cell is high.

Description

technical field [0001] The present invention relates to a battery and a preparation method thereof, in particular, the present invention relates to a lithium ion battery and a preparation method thereof. Background technique [0002] As a chemical power source, a lithium-ion battery refers to a secondary battery that uses two compounds that can reversibly intercalate and deintercalate lithium ions as the positive and negative electrodes. When the battery is charged, lithium ions are deintercalated from the positive electrode and intercalated in the negative electrode, and vice versa during discharge. [0003] Lithium-ion secondary batteries are widely used in modern mobile electronic devices and communication devices, such as mobile phones, notebook computers, and handheld computers, because of their advantages such as high specific energy, high working voltage, low self-discharge rate, long cycle life, and no pollution , Personal Digital Assistant (PDA), compact camera, di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/38H01M2/00H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 蔡小丽谷庆
Owner BYD CO LTD
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