A kind of electrochemical battery and preparation method thereof

An electrochemical and battery technology, applied in the field of electrochemical batteries, can solve the problems of poor performance and vulnerability to damage of flexible batteries, and achieve the effects of reduced energy density, high safety performance, and reduced process

Active Publication Date: 2018-11-16
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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  • A kind of electrochemical battery and preparation method thereof
  • A kind of electrochemical battery and preparation method thereof
  • A kind of electrochemical battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] figure 1 It is a schematic top view of one structure of the electrochemical cell of the present invention: the negative pole tab 01 and the positive pole tab 02 are distributed on the two opposite sides of the cell body 03, that is, the positive pole tab 02 and the negative pole tab 01 are not separated from the cell body 03 leads out from the same side. figure 2 It is a schematic cross-sectional view of the main body of the electrochemical cell of the present invention. It can be obtained from the figure that the negative electrode collector 10 is coated with a negative electrode coating to obtain a negative electrode sheet 11, and the positive electrode collector 13 is coated with a positive electrode coating to obtain a positive electrode sheet 14. 12 is located between the negative electrode sheet 10 and the positive electrode sheet 14; on the left side of the schematic diagram are the negative electrode sheet extension structure 11a and the separator extension str...

Embodiment 2

[0046] The difference from Example 1 is that it includes the following steps:

[0047] Electrode sheet preparation: use lithium cobaltate as the positive electrode active material, PVDF as the binder, and Super-P as the conductive agent NMP as the solvent, stir evenly, and coat it to obtain a coating area and an empty foil area along the coating direction. Coil, then cold-pressed into strips (the width of the empty foil area after stripping is 10mm), and the positive electrode sheet to be wound is obtained; graphite is used as the negative electrode active material, SBR and CMC are used as the binder, Super-P is used as the conductive agent, Water is the solvent, stirred evenly, and coated to obtain a coil material forming a coated area and an empty foil area along the coating direction, and then cold-pressed into strips (the width of the empty foil area after striping is 50 mm), and the coil to be wound is obtained. Negative plate.

[0048] Bare cell assembly: Wind the above...

Embodiment 3

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

[0054] Electrode sheet preparation: use lithium cobaltate as the positive electrode active material, PVDF as the binder, and Super-P as the conductive agent NMP as the solvent, stir evenly, and coat it to obtain a coating area and an empty foil area along the coating direction. Coil material, then cold-pressed into strips (the width of the empty foil area after stripping is 2mm), and then a layer of ceramic layer with a thickness hc of 1 μm and a width d1 of 2 mm is coated on the head of the positive electrode coating layer as an anti-burr short circuit Treat the layer to obtain the positive electrode sheet to be wound; use graphite as the negative electrode active material, SBR and CMC as the binder, Super-P as the conductive agent, and water as the solvent to stir evenly, and then apply it to form a coating along the coating direction. The roll material in the application area and the empty foil ...

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Abstract

The invention belongs to the field of energy storage devices, in particular to an electrochemical cell, comprising a bare cell, an electrolyte and an outer package structure, the bare cell includes a positive electrode, a separator and a negative electrode; the positive electrode is composed of a positive electrode lug It is composed of a positive electrode sheet; the negative electrode is composed of a negative electrode tab and a negative electrode sheet; the positive electrode tab and the negative electrode tab are drawn from different sides of the electrochemical cell; in the electrochemical cell, the lead On the side of the positive (negative) pole tab, the protrusion of the negative (positive) electrode sheet is less than or equal to the protrusion of the separator, and the protrusion of the separator is less than or equal to the protrusion of the separator. The protruding amount of the positive (negative) electrode sheet; the cell manufacturing process of this structure is simple, and the prepared cell has excellent electrochemical performance, higher packaging reliability, smaller self-discharge rate, and better anti-drop performance.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/04H01M4/04
CPCH01M4/04H01M10/04Y02E60/10Y02P70/50
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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