Pole piece and preparation method and application thereof

A pole piece and pole ear technology, applied in the field of pole piece and its preparation, can solve the problems of large internal resistance of the cell, large area, low welding efficiency, etc., and achieve simple production equipment, improved safety performance, and high production efficiency. Effect

Pending Publication Date: 2022-02-15
惠州赣锋锂电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the organic polymer layer in the middle of this composite current collector is relatively insulated from the metal. After the tabs are welded on one side of the pole piece, the internal resistance of the battery cell is too large and some active materials cannot participate due to the non-conduction of the metal layers on both sides. The electrochemical reaction of the battery
[0004] At present, the common welding methods of metal-polymer-metal structure composite current collectors are: using double pole lugs: when welding, one pole lug is welded on the front and back sides of the pole piece, but the lug glue of the two pole lugs is in the Can not be well fused together during packaging, resulting in electrolyte leakage
Foil transfer: Use two pieces of foil to weld on both sides of the composite current collector in advance, and then weld the common tab to the foil, but the foil is light in weight, and the mechanical structure is difficult to absorb or grab the foil. lead to very low welding efficiency
Using bifurcated lugs: using special lugs with bifurcated structure, two layers of lugs are welded on both sides of the composite current collector at the same time during welding, and there is only one layer of lug glue, but special lugs require additional customization, and customization costs high
Use special lugs: first use the lug with lug glue to weld on one side of the pole piece, then weld the lug without lug glue to the other side of the pole piece and the lug with lug glue respectively together, but the area where the two tabs are welded is too large, and an additional design of the battery casing is required, which reduces the energy density of the battery

Method used

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  • Pole piece and preparation method and application thereof

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preparation example Construction

[0041] The present invention also provides a method of preparing the above-described pole, including the following steps:

[0042] Step 1: Coating the active substance on both sides of the partial region of the composite collector, one or more extreme eating welding positions are determined in the region of the uncoated active material, and the through hole or gap is provided;

[0043] Step 2: Welding the metal sheet to the first metal layer of the composite collector, turning the metal sheet with the first metal layer, and weld the pole welding the second metal of the composite collector. Layers, the poor ear is turned on with the second metal layer;

[0044] Step 3: Welding the metal sheet together with the ear in a through hole or a notch, so that the metal sheet is turned on with the pole to form the pole and the first metal layer and The second metal layer is turned on.

[0045]Further, any step and a plurality of steps can be performed separately or simultaneously.

[0046] ...

Embodiment 1

[0050] See figure 1 and figure 2 The preparation steps of the present embodiment are as follows: using aluminum-polyethylene terephthalate-aluminum composite fluid;

[0051] Step 1: Preparation of aluminum metal sheets, a width of 20 mm, length 30 mm, thickness of 0.06 mm;

[0052] Step 2: Lithium cobaltate is applied to the partial region of the aluminum composite collector, selecting a region from 15 mm from the active substance to be uncoated as the extrapolation position;

[0053] Step 3: Use the laser to burn a rectangular through hole in the position of step I, with a width of 6 mm, length 15 mm, to obtain a pole piece with through holes;

[0054] Step 4: Welding aluminum metal sheets on the first aluminum metal layer of the polar composite fluid obtained by the step three, so that the metal sheet is connected to the composite collector first aluminum metal layer;

[0055] Step 5: A aluminum metal layer of a pole composite fluid obtained by having a length of 25 mm is solder...

Embodiment 2

[0059] See image 3 and Figure 4 The preparation steps of the present embodiment are as follows: using copper-polyethylene terephthalate-copper composite fluid;

[0060] Step 1: Preparation of copper metal sheets, its width is 15mm, length 40mm, thickness 0.04 mm;

[0061] Step 2: Apply the human graphite material to the partial area of ​​the current collector, selecting a region where 20 mm from the active substance is not coated as the extract is used as the extrapolate;

[0062] Step 3: A rectangular gap is burned using a laser in step II, which has a width of 8 mm, length 15mm, and obtains a plate with a gap;

[0063] Step 4: The copper metal sheet is easily welded to the first copper metal layer of the polar composite collector of the step three, so that the copper metal sheet is connected to the composite collector first copper metal layer;

[0064] Step 5: Nickel-emitting a nickel-eared, a length of 28 mm, a length of 28 mm, is soldered on the second copper metal layer of th...

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Abstract

The invention provides a pole piece and a preparation method and application thereof. The pole piece comprises a composite current collector, an active substance, a tab and a metal sheet, wherein the composite current collector comprises a polymer layer, and a first metal layer and a second metal layer which are arranged on two sides of the polymer layer; the composite current collector is provided with a dressing area and an empty foil area, the dressing area is internally coated with an active substance, the area which is not coated with the active substance is the empty foil area, and the empty foil area is provided with a through hole or a notch; the metal sheet is arranged on one side of the first metal layer and is connected and conducted with the first metal layer, and the tab is arranged on one side of the second metal layer and is connected and conducted with the second metal layer; and the metal sheets are connected and conducted with the tabs through the through holes or the notches. The pole piece provided by the invention is high in production efficiency, small in battery internal resistance and high in safety performance.

Description

Technical field [0001] The present invention relates to a pole and its preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in 3C digital, new energy electric vehicles and energy storage systems, etc. due to high energy density, stable discharge, low cycle life, low discharge rate, and environmentally friendly. The main components of the lithium battery have a positive and negative active substance, a positive and negative electrode fluid, a very ear, a diaphragm, an electrolyte, a battery housing, and the like. The main role of the lithium-ion battery concentration is: carrying positive and negative electrode active substances, and simultaneously generates a small current generated by an electrochemical reaction of the active material and passes through the extreme ear to pass through the external circuit. The commercial positive electrode concentration fluid is mainly an aluminum foil, and the negative electrode fluid i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/66H01M10/0525
CPCH01M4/13H01M4/139H01M4/66H01M10/0525Y02E60/10
Inventor 刘家鹏戈志敏王乾宾术韦向红黄龙
Owner 惠州赣锋锂电科技有限公司
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