Method for preparation of lithium ion battery

A lithium-ion battery and battery case technology, applied in secondary battery manufacturing, electrolyte storage battery manufacturing, secondary battery and other directions, can solve the problems of small electrolyte injection, short cycle life, low battery capacity, etc., and achieve higher capacity. Consistent with cycle performance, pole piece potential, and avoid local overcharge

Inactive Publication Date: 2008-06-25
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method that can make the electrolyte in the battery practically injected in order to overcome the disadvantages of the small actual injection amount of the electrolyte in the battery made by the method for preparing lithium-ion batteries in the prior art, resulting in low battery capacity and short cycle life. Method for preparing lithium-ion battery with large injection amount, thereby improving battery capacity and cycle life

Method used

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  • Method for preparation of lithium ion battery
  • Method for preparation of lithium ion battery
  • Method for preparation of lithium ion battery

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0016] This embodiment is used to illustrate the preparation method of the lithium ion battery provided by the present invention.

[0017] Prepare 25 identical LP053450ARK type semi-finished lithium-ion batteries according to the following method:

[0018] 100 parts by weight of LiCoO 2 , 2.0 parts by weight of binder PVDF, 4.5 parts by weight of conductive agent acetylene black were added to 70 parts by weight of (NMP), and then stirred in a vacuum mixer to form a uniform positive electrode slurry. This slurry is evenly coated on the aluminum foil with a width of 400 mm and a thickness of 0.016 mm, then dried at 120°C, rolled and cut on a slitting machine to obtain a size of 140.0 mm (length) × 50.0 mm (width). ) × 0.145 mm (thick) positive pole piece.

[0019] 100 parts by weight of negative electrode active material natural graphite, 1.0 parts by weight of binder polyvinylidene fluoride (PVDF) and 1.0 parts by weight of conductive agent carbon black are added in 120 parts...

Embodiment 2

[0024] This embodiment is used to illustrate the preparation method of the lithium ion battery provided by the present invention.

[0025] Prepare 25 completely identical LP053450ARK semi-finished lithium-ion batteries according to the method of the above-mentioned embodiment 1, and the numbers are respectively A26-A50, and then these semi-finished lithium-ion batteries A26-A50 are dried at a temperature of 20°C and a relative humidity of 0.1%. After the chamber was placed for 14 hours, it was squeezed and exhausted, and then the injection port of the electrolyte was sealed to obtain lithium-ion batteries AA26-AA50. value and the difference between the battery weight after liquid injection and the battery weight after sealing (sealing the injection port) to calculate the actual injection volume and leakage volume of the electrolyte, and measure the thickness of the above-mentioned lithium-ion battery at the center point of the battery at the same time. The results are as follow...

Embodiment 3

[0027] This embodiment is used to illustrate the preparation method of the lithium ion battery provided by the present invention.

[0028] Prepare 25 completely identical LP053450ARK type semi-finished lithium-ion batteries according to the method of the above-mentioned Example 1, and the serial numbers are A51-A75 respectively. After standing for 30 hours, squeeze and exhaust, and then seal the injection port of the electrolyte to obtain lithium-ion batteries AA51-AA75. The obtained lithium-ion batteries are weighed, and the difference between the weight of the battery after the liquid injection and the weight of the battery before the liquid injection is obtained. Calculate the actual injection amount and leakage amount of the electrolyte by calculating the difference between the weight of the battery after liquid injection and the weight of the battery after sealing (sealing the injection port), and measure the thickness of the above-mentioned lithium-ion battery at the cent...

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Abstract

The invention relates to a preparation method of a lithium ion battery, which comprises the steps that a polar core is arranged in the casing body of a battery after being formed by a positive pole, a negative pole and a diaphragm, and then injected into the electrolytic solution to form a semi-finished lithium ion battery, after the semi-finished lithium ion battery is formed and exhausted, the liquid-injection port of the casing body of the battery is sealed; wherein, the method also comprises the steps that the formed semi-finished lithium ion battery is arranged before the exhaustion. According to the method provided by the invention, the gas generated inside the battery can be adequately absorbed and exhausted through putting the semi-finished lithium ion battery for a time interval between the formation and the exhaustion process of the semi-finished lithium ion battery, therefore, the leakage phenomenon of a considerable amount of gas and the electrolytic solution generated during the exhausting process can be effectively avoided, to ensure that the actual injection amount of the electrolytic solution of the battery is increased; thereby, the capacitance and the cycle performance of the battery is enhanced.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery. Background technique [0002] Lithium-ion batteries are more and more widely used in various electronic products because of their high energy density and no environmental pollution. A lithium-ion battery generally includes a pole core, an electrolyte and a battery casing, the pole core and the electrolyte are sealed in the battery casing, and the pole core includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. The electrolyte is an important component of the lithium-ion battery, which provides ion conduction between the positive and negative electrodes of the battery. The electrolyte is generally composed of organic solvents, lithium salts and additives. The amount of electrolyte is related to the battery capacity and cycle life. Insufficient electrolyte will cause the battery capacity to decrease and the cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/40H01M10/04H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 王凯
Owner SHANGHAI BYD
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