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Battery pole plate, method for producing the pole plate, and Li-ion battery

A manufacturing method and battery electrode technology, applied in the field of lithium-ion batteries, can solve the problems of low battery capacity, distance can not meet tolerance requirements, etc., and achieve the effect of increasing capacity

Active Publication Date: 2008-07-02
BYD CO LTD
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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 overcome the shortcoming that the distance between the positive and negative tabs of the existing battery cores cannot meet the tolerance requirements, and the battery capacity made of such pole cores is low, and to provide a battery capacity that can increase the capacity of the positive and negative tabs. Battery pole cores with distances between them satisfying tolerance requirements, method for making such battery pole cores, and lithium-ion batteries including such battery pole cores

Method used

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  • Battery pole plate, method for producing the pole plate, and Li-ion battery
  • Battery pole plate, method for producing the pole plate, and Li-ion battery
  • Battery pole plate, method for producing the pole plate, and Li-ion battery

Examples

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preparation example Construction

[0044] In the preparation method of the positive electrode sheet, except that the punching process is provided by the present invention, the others are conventional preparation methods. For example, the positive electrode slurry is prepared by mixing the positive electrode active material, conductive agent and binder with a solvent, coating and / or filling the positive electrode slurry on the current collector, drying, and punching to obtain the positive electrode slurry. Said positive plate. Wherein, the solvent can be selected from N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), dimethylsulfoxide (DMSO), tetrahydrofuran (THF) and One or more of water and alcohols. The amount of the solvent can make the positive electrode slurry have viscosity and fluidity, and it only needs to be able to be coated on the current collector. Generally, based on the weight of the positive electrode active material, the content of the solvent is 5-70% by weight, pref...

Embodiment 1

[0055] This embodiment illustrates the battery pole core and lithium ion battery provided by the present invention.

[0056] (1) Preparation of positive pole piece

[0057] The positive electrode material coating slurry is prepared by the following method: 15 parts by weight of polyvinylidene fluoride (Atofina Company, 761#PVDF) is dissolved in 225 parts by weight of N-methyl-2-pyrrolidone (NMP) solvent. Obtain binder solution, disperse 15 parts by weight of carbon black (the commodity of TIMICAL company, super-p by trade name) in the above-mentioned binder solution, then add 500 parts by weight of lithium manganese oxide in the gained solution, fully mix and prepare Obtain positive electrode material coating slurry.

[0058] On the aluminum foil, apply the positive electrode material coating slurry in the way of pulling slurry, the thickness of the positive electrode material coating is controlled at 0.10 mm, bake at 120 ° C for 5 hours, and then roll under a pressure of 1.6...

Embodiment 2

[0079] This example illustrates the capacity and tab spacing of the lithium ion battery provided by the present invention.

[0080] Take 100 lithium-ion batteries A1 produced according to the method of Example 1, use a vernier caliper to measure their external dimensions and the distance between tabs, and use a BS-9300 battery performance tester to measure the battery capacity. The obtained values ​​are shown in Table 1:

[0081] Table 1

[0082]

[0083] 2

[0084] 30

[0085] 58

[0086] 86

[0087] The capacity of the 100 batteries in Example 1 has been increased by more than 50mAh on average, which is about 4%; the inter-lug spacing of the 100 batteries in Example 1 is between 12.69-13.43mm, all of which meet the requirements of 13±0.5mm .

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Abstract

The invention relates to a battery polar core which comprising an anode slice, a diaphragm, a cathode slice and ears of the anode and cathode. The ears of the anode and cathode are respectively connected with the anode slice and the cathode slice. The anode slice, the diaphragm and the cathode slice are folded together and then circled into the battery polar core. A bulge is provided with in the width direction of an end part on the end of the anode slice and the cathode slice. The ears of the anode and cathode are respectively connected with the bulges of the anode slice and the cathode slice. The invention also provides a method for manufacturing the battery polar core and a lithium iron battery made of the battery polar core. The polar core manufactured according to the method for manufacturing the battery polar core provided by the invention is a polar core which can improve the battery capacity and meet the tolerance requirement for the distance between the ears of the anode and cathode. The capacity of the lithium ion battery made by using the battery polar core provided by the invention is high.

Description

technical field [0001] The invention relates to a battery pole core and a manufacturing method thereof, and also to a lithium ion battery including the pole core. Background technique [0002] Lithium-ion batteries have been widely used in various fields such as mobile phones and notebook computers. With the continuous development of the market, in addition to requiring various special performance lithium-ion batteries, the requirements for basic performance such as the size and capacity of the battery are also getting higher and higher. The various performances of lithium-ion batteries are mainly determined by its core component, the pole core. The current pole core manufacturing methods are generally divided into two categories: winding and lamination. The winding pole core has a relatively simple manufacturing process and can meet the needs of general discharge performance lithium-ion batteries. [0003] In the existing lithium-ion battery pole core, when making the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/26H01M10/40H01M10/38H01M4/13H01M4/139H01M10/0525
CPCY02E60/122Y02E60/124Y02E60/10
Inventor 梁世硕罗勇刘卫平
Owner BYD CO LTD
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