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A kind of electrodeless 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 insufficient safety performance, increased battery quality, large current collector quality, etc., to reduce battery quality. , The effect of improving the resistivity difference and improving the safety performance

Active Publication Date: 2022-07-05
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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  • A kind of electrodeless cylindrical battery and preparation method thereof
  • A kind of electrodeless cylindrical battery and preparation method thereof
  • A kind of electrodeless cylindrical battery and preparation method thereof

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preparation example Construction

[0027] The invention provides a preparation method of a cylindrical battery without tabs, which does not need to be welded by tabs, and adopts light-weight positive electrode composite current collector and negative electrode composite current collector, which significantly improves 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 an 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 a conductive metal material layer 1;

[0029] The material of the p...

Embodiment 1

[0038] In this embodiment, the polymer material layer of the positive electrode composite current collector is made of polyvinylidene fluoride (PVDF), and the thickness of the polymer material layer is 3 μm; the conductive metal material layers on both sides are made of aluminum with a thickness of 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 500 nm. The battery is made by gap coating, and the width of the uncoated area is 5 mm. After winding, the uncoated area is flattened, and then the side of the uncoated area and the metal shell of the cylindrical battery are welded together by laser welding. The specific production steps are as follows:

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

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 layers 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, and the thickness is 400m. The battery was fabricated by gap coating, and the width of the uncoated area was 6 mm. After winding, the uncoated area was flattened, and then the side of the uncoated area and the metal casing of the cylindrical battery were welded together by laser welding. The specific production steps are as follows:

[0048] Step 1: The polyethylene terephthalate material of the coil structure is used as the polymer material layer,...

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Abstract

The invention belongs to the technical field of lithium batteries and battery materials. It discloses a tabless cylindrical battery and a preparation method thereof. The method includes coating a positive electrode composite current collector and a negative electrode composite current collector with a positive electrode active material and a negative electrode active material respectively, and A partial uncoated area is provided on one side of the coated surface, and the uncoated area of ​​the positive electrode composite current collector and the uncoated area of ​​the negative electrode composite current collector are respectively connected to the metal shell of the cylindrical battery. This application provides an uncoated area on one side of the positive electrode composite current collector and the negative electrode composite current collector. The uncoated area is arranged on the outside of the separator and is directly connected to the metal shell of the cylindrical battery without connecting the tabs. Therefore, the tabs are avoided. The internal resistance of welding reduces the mass of the battery and increases the energy density of the battery; at the same time, the middle layer of the composite current collector is a polymer layer, and the upper and lower surfaces are respectively plated with a metal layer. It is light in weight, and the upper and lower layers are not directly conductive, effectively avoiding internal short circuits. occurs, effectively improving the safety performance of the battery.

Description

Technical field [0001] The invention belongs to the technical field related to lithium batteries and battery materials, and more specifically, relates to a tabless cylindrical battery and a preparation method thereof. Background technique [0002] With the current social development and technological progress, among the existing secondary battery systems, lithium-ion batteries are widely used in portable electronic products such as mobile communications, laptops, and digital cameras due to their significant advantages of high specific energy and long cycle life. power supply and power energy 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. However, the instability of the electrode material structure caused by high energy density can easily lead to thermal runaway inside the battery, which in turn can cause the battery to explode. Therefore, , the develop...

Claims

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Application Information

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Patent Type & Authority Patents(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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