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Flexible cell and preparation method thereof

A flexible battery and active material layer technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve the problems of material and process cost waste, energy density loss, etc., and achieve improved packaging strength and improved bonding power and cost reduction

Inactive Publication Date: 2016-05-11
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest disadvantage of this structure is that the tabs must be connected externally, resulting in a loss of energy density and a waste of material and process costs.

Method used

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  • Flexible cell and preparation method thereof
  • Flexible cell and preparation method thereof

Examples

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preparation example Construction

[0078] The method for preparing a flexible battery according to the second aspect of the present invention is used to prepare the flexible battery according to the first aspect of the present invention, comprising the steps of: using adjacent first pole pieces 1 and second pole pieces 2 respectively in The middle area M on the opposite surface of the first current collector 11 and the second current collector 21 is intermittently coated with the first active material layer 12 and the second active material layer 22 at a predetermined interval, and the first pole pieces 1 stacked on each other And the second pole piece 2 is not coated with the corresponding active material layer on the outer surface of the corresponding current collector located on the outermost side; the first pole piece 1, using a polyolefin substrate coated with an adhesive as a separator 3. The second pole piece 2 is dried and dehydrated; the encapsulation glue 6 is glued on the peripheral area R and intermi...

Embodiment 1

[0088] The positive electrode active material layer and the negative electrode active material layer are intermittently coated on the middle area M of the opposite surface of the positive electrode current collector copper foil with a thickness of 20 μm and the negative electrode current collector aluminum foil with a thickness of 20 μm, keeping the distance between the active material layers 4mm, wherein the positive active material is lithium cobaltate, and the negative active material is natural graphite; the positive electrode sheet, the negative electrode sheet, and the separator containing the SBR adhesive on the surface of the polyolefin substrate are dried at 60°C for 4h, and Control the ambient humidity to be 2% RH; then glue the epoxy resin glue on the peripheral area R of the copper foil and the aluminum foil; then spray on the positive electrode active material layer and the negative electrode active material layer 6 Ethyl methyl carbonate liquid electrolyte, the am...

Embodiment 2

[0090] The positive electrode active material layer and the negative electrode active material layer are intermittently coated on the middle area M of the opposite surface of the positive electrode current collector stainless steel foil with a thickness of 100 μm and the negative electrode current collector aluminum foil with a thickness of 100 μm, keeping the distance between the active material layers 6mm, wherein the positive electrode active material is lithium iron phosphate, and the negative electrode active material is artificial graphite; the positive electrode sheet, the negative electrode sheet, and the separator containing PVDF adhesive on the surface of the polyolefin substrate are dried at 90°C for 12h, and controlled The humidity of the environment is 0.5%RH; Then, the peripheral area R of the stainless steel foil and the aluminum foil is covered with acrylic glue; Then, the positive electrode active material layer and the negative electrode active material layer a...

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Abstract

The invention provides a flexible cell and a preparation method thereof. The flexible cell comprises a first pole piece, a second pole piece, an isolated film, a first tab, a second tab, an electrolyte, packaging glue and an external packing gummed paper. The surfaces of each one of the adjacent first pole piece and the second pole piece respectively opposite to a first current collector and a second current collector are provided with central zones and peripheral zones surrounding the central zones, and the central zones are respectively used for arrangement of a first active material layer and a second active material layer. The outer contour of the isolated film between the adjacent first and second active material layers covers and exceeds the first and second active material layers. The isolated film is a polyolefin base material coated with a binder. Packing gum is located at the peripheral zones of the adjacent first current collector surface and the second current collector surface and respectively bonds the adjacent first and second current collectors and two surfaces of the isolated film at the middle.

Description

technical field [0001] The invention relates to the field of energy storage devices, in particular to a flexible battery and a preparation method thereof. Background technique [0002] Due to the many advantages of lithium-ion batteries, such as high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge and long cycle life, etc., its application in the field of mobile devices has been unprecedented. development, including mobile phones, video cameras, notebook computers, and other portable appliances. With the development of technology for mobile and convenient devices and the increase in demand therefor, the demand for secondary batteries as energy sources is rapidly increasing. Among such secondary batteries, studies on lithium secondary batteries having high energy density and discharge voltage have been widely conducted, and are now widely used. [0003] With the interest of consumers, electronic equipment tends...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/058H01M2/16H01M50/403H01M50/417H01M50/46
CPCY02E60/10Y02P70/50
Inventor 周华利方宏新游从辉鲍晋珍郭明俐姜胜男
Owner DONGGUAN AMPEREX TECH
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