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Electrochemical cell and preparation method thereof

An electrochemical and battery technology, applied in the field of electrochemical batteries, can solve problems such as vulnerability to damage and poor performance of flexible batteries, and achieve the effects of improving energy density, increasing and reducing electrode impedance, and solving packaging reliability

Active Publication Date: 2016-03-16
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the bending process of flexible batteries, the interface inside the battery cell is often its weak link and is easily damaged, which makes the performance of the flexible battery worse; therefore, reducing the number of internal interfaces of the flexible battery as much as possible is a reliable way to improve the performance of the flexible battery. method

Method used

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  • Electrochemical cell and preparation method thereof
  • Electrochemical cell and preparation method thereof
  • Electrochemical cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] figure 1 Shown is the schematic diagram of the cross-sectional structure of the electrochemical cell corresponding to this embodiment. It can be seen from the figure that the negative electrode coating 02 is coated on one surface of the current collector 01A as the packaging material, and then coated with the separator 03 and double-sided coating There are five layers of electrodes in total (three negative electrodes, two positive electrodes, two of the three negative electrodes are single-sided coated, one is double-sided coated, and the two positive electrodes are double-sided coated. The positive electrode sheet is welded together with the current collector 07 through the current collector cutting lug 05, and is connected to the outside of the cell by the current collector 07. The current collectors 01A and 01B are water-proof layers in the packaging structure. The insulating sealing layer 06C bonds the water-blocking layer 01A and 01B together to seal and insulate t...

Embodiment 2

[0048] The difference from Example 1 is that it includes the following steps:

[0049] Auxiliary treatment of current collector packaging: put chromium solution in the electroplating tank, spread copper foil with a thickness of 30 μm on the surface of the electroplating tank, and perform electroplating to obtain a chromium-containing packaging auxiliary treatment layer with a thickness of 10 nm, and then wash it with deionized water , to obtain the current collector after encapsulation auxiliary treatment for use;

[0050] Negative electrode preparation as a packaging structure: apply the above-mentioned negative electrode slurry on the current collector after the above-mentioned auxiliary encapsulation treatment to obtain a single-sided coated electrode sheet, and then wash off the coating corresponding to the sealing area with deionized water, and separate After cutting, the negative electrode electrode coated on one side of the monolithic sheet is obtained for use;

[0051...

Embodiment 3

[0053] The difference from Example 1 is that it includes the following steps:

[0054] Auxiliary treatment of current collector packaging: place the chromium solution in the electroplating tank with a fixed structure (the electroplating tank is a "ten" cross groove, of which only the "cross" line is the chromium liquid containing tank, and the groove width matches the seal width (equal to seal width)), and then spread copper foil with a thickness of 10 μm on the surface of the electroplating tank for electroplating to obtain a chromium-containing packaging auxiliary treatment layer with a thickness of 10 nm. The chromium-containing packaging auxiliary treatment layer divides the current collector into multiple uncoated The treated current collector small pieces are then cleaned with deionized water to obtain the packaged auxiliary treated current collector for use;

[0055] The rest are the same as in Embodiment 1 and will not be repeated here.

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Abstract

The invention belongs to the technical field of flexible devices, and particularly relates to an electrochemical cell. The electrochemical cell comprises positive electrodes, a separator, negative electrodes, an electrolyte and an external packaging structure, wherein the sum n of the number of the positive electrodes and the number of the negative electrodes is an odd number; the external packaging structure at least comprises an positive current collector a and / or a negative current collector b; and the external packaging structure is a tab of the cell. The outermost electrode current collector of the cell serves as the packaging material of the cell and one of the tabs (and thus the cell only needs one special tab), so that the species and using amount of the materials are reduced, and the material cost is reduced; meanwhile, the energy density of the cell is improved; and moreover, in the preparation process, packaging assisted treatment is carried out on the current collector on a sealing side only, so that the problem of packaging reliability can be solved, the treatment cost can be reduced (the using amount of an expensive treating fluid is reduced), and finally the side effects of electrode impedance increase caused by packaging assisted treatment can also be reduced.

Description

technical field [0001] The invention belongs to the technical field of electrochemical batteries, in particular to an electrochemical battery and a preparation method thereof. Background technique [0002] After entering the 21st century, various electronic device products such as mobile phones, notebooks, wearable devices, etc. emerge in an endless stream, which greatly enriches the lives of the majority of users; at the same time, electric vehicles and various energy storage power stations are also rapidly sprouting, developing, and grow. The above high-tech products have a common feature: high-performance, low-cost batteries are required to act as energy storage components. [0003] Existing batteries mainly include primary batteries and secondary batteries; the so-called primary batteries, that is, batteries that cannot be recharged, mainly include carbon-zinc batteries, alkaline batteries, paste-type zinc-manganese batteries, cardboard zinc-manganese batteries, alkalin...

Claims

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Application Information

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IPC IPC(8): H01M4/70H01M10/04H01M2/08
CPCH01M4/70H01M10/0431H01M50/183Y02E60/10Y02P70/50
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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