Tab-free cylindrical battery and preparation method thereof

A cylindrical battery, electrodeless ear technology, applied in the direction of cylindrical shell battery/battery, secondary battery manufacturing, battery, etc., can solve the problems of increased internal resistance, insufficient safety performance, increased battery quality, etc.

Active Publication Date: 2021-06-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for preparing a cylindrical battery without tabs to solve the problems of increased battery mass, increased internal resistance and current collector problems caused by tab welding in the existing battery manufacturing process. Technical problems such as high quality and insufficient safety performance

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  • Tab-free cylindrical battery and preparation method thereof
  • Tab-free cylindrical battery and preparation method thereof
  • Tab-free cylindrical battery and preparation method thereof

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preparation example Construction

[0027] The invention provides a method for preparing a cylindrical battery without tabs, which does not require tab welding, and adopts light-weight positive electrode composite current collectors and negative electrode composite current collectors to significantly increase the energy density of the battery. The preparation method includes:

[0028] S1: The positive electrode composite current collector and the negative electrode composite current collector are respectively coated with a positive electrode active material and a negative electrode active material, and a part of the uncoated area is provided on one side of the coated surface, wherein the positive electrode composite current collector and the negative electrode composite current collector include Three layers (such as figure 1 shown), wherein the middle layer is a polymer material layer 2, and both sides of the polymer material layer are conductive metal material layers 1;

[0029] The material of polymer materi...

Embodiment 1

[0038] In this embodiment, the material of the polymer material layer of the positive electrode composite current collector is polyvinylidene fluoride (PVDF), and the thickness of the polymer material layer is 3 μm; the material of the conductive metal material layers on both sides is aluminum, and the thickness is 1000 nm. The material of the polymer material layer of the negative electrode composite current collector is polypropylene (PP); the material of the conductive metal material layers on both sides is copper, and the thickness is 500nm. The battery is produced by gap coating, and the width of the uncoated area is 5mm. After the uncoated area is flattened after winding, laser welding is used to weld the side of the uncoated area to the metal shell of the cylindrical battery. The specific production steps are as follows:

[0039] Step 1: The polyvinylidene fluoride material of the roll structure is used as a polymer material layer, wound on the drum, and the drum is set...

Embodiment 2

[0047] In this embodiment, the material of the polymer material layer of the positive electrode composite current collector is polyethylene terephthalate (PET), and the thickness of the polymer material layer is 6 μm; the material of the conductive metal material layer on both sides is aluminum Silver alloy with a thickness of 800nm. The material of the polymer material layer of the negative electrode composite current collector is polyimide (PI); the material of the conductive metal material layers on both sides is copper nickel with a thickness of 400m. The battery is produced by gap coating, and the width of the uncoated area is 6mm. After the uncoated area is flattened after winding, laser welding is used to weld the side of the uncoated area to the metal shell of the cylindrical battery. The specific production steps are as follows:

[0048] Step 1: Use the polyethylene terephthalate material of the coil structure as the polymer material layer, and wind it on the drum, a...

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Abstract

The invention belongs to the technical field of lithium batteries and battery materials, and discloses a tab-free cylindrical battery and a preparation method thereof. The method comprises the steps that a positive composite current collector and a negative composite current collector are coated with a positive active material and a negative active material respectively, one side of each coating surface is provided with a part of uncoated area, and and the uncoated area of the positive composite current collector and the uncoated area of the negative composite current collector are respectively connected with a metal shell of the cylindrical battery. One side of the positive composite current collector and one side of the negative composite current collector are provided with the uncoated areas, and the uncoated areas are arranged on the outer side of a diaphragm and are directly connected with the metal shell of the cylindrical battery without connecting tabs, so the internal resistance of tab welding is avoided, the mass of the battery is reduced, and the energy density of the battery is improved; and meanwhile, the middle layer of the composite current collector is a polymer layer, the upper and lower surfaces are respectively plated with a metal layer, weight is light, and the upper and lower layers do not directly conduct electricity, so inner short circuit is effectively avoided, and the safety performance of the battery is effectively improved.

Description

technical field [0001] The invention belongs to the technical field related to lithium batteries and battery materials, and more specifically relates to a cylindrical battery without tabs and a preparation method thereof. Background technique [0002] With the current social development and technological progress, in the existing secondary battery system, lithium-ion batteries are widely used in portable electronic products such as mobile communications, laptop computers, and digital cameras due to their significant advantages of high specific energy and long cycle life. power supply and power storage system for electric vehicles. In recent years, high energy density and long cruising range have become the focus of research and development of lithium batteries, but the instability of the electrode material structure brought about by high energy density can easily lead to thermal runaway inside the battery, which in turn causes the battery to explode. , the development of ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M50/107H01M50/119H01M50/531H01M10/0587H01M10/0525H01M10/04
CPCH01M4/667H01M10/0587H01M10/0525H01M10/0422H01M2220/20H01M2220/30Y02P70/50Y02E60/10
Inventor 黄云辉伽龙严超
Owner HUAZHONG UNIV OF SCI & TECH
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