Thin type secondary battery and preparation method therefor

A secondary battery, thin technology, used in secondary battery manufacturing, batteries, small flat batteries/batteries, etc., can solve problems such as increased cost and waste of active materials, and achieves cost saving, convenient processing, and enhanced strength.

Pending Publication Date: 2017-07-18
HANGZHOU FUTURE POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has the disadvantage of wasting the active material on the other side and increasing the cost

Method used

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  • Thin type secondary battery and preparation method therefor
  • Thin type secondary battery and preparation method therefor
  • Thin type secondary battery and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A thin secondary battery, comprising at least one positive pole piece and at least one negative pole piece, the positive pole piece and the negative pole piece are arranged at intervals in sequence, and each pole piece includes a metal current collector, such as figure 1 and 2 As shown, the metal current collector 1 in the outermost pole piece 4 is provided with an active material layer 2 on one side facing other pole pieces, and a polymer material layer 3 is provided on the other side; when the number of pole pieces is greater than or equal to 3, the middle pole piece Active material layers 2 are provided on both sides of the metal current collector.

[0058] Only one side of the outermost pole piece of a thin secondary battery needs to be provided with an active material layer. By providing a polymer material layer on the side of the metal current collector that does not need to be provided with an active material layer, it can offset or partially offset the damage ca...

Embodiment 2

[0073] Such as image 3 As shown, this embodiment discloses a method for preparing a thin secondary battery, including:

[0074] The positive electrode sheet 9 is obtained, the positive electrode sheet includes a positive electrode current collector, one side of the positive electrode current collector is provided with a positive electrode active material layer, and the other side is provided with a hot melt adhesive polymer material layer, the structure of the positive electrode sheet 9 in this embodiment is the same as The structure of the outermost pole plate in Embodiment 1 is the same. In this embodiment, the specific steps for preparing the positive electrode sheet are: the positive electrode active material lithium cobaltate, the binder polyvinylidene fluoride (PVDF) and the conductive agent conductive carbon black are mass ratio (94 ~ 98): (1 ~ 3): (1~3) Mix evenly with the solvent N-methylpyrrolidone, stir at a high speed to obtain a uniformly dispersed positive elec...

Embodiment 3

[0085] Such as Figure 4 and 5 As shown, this embodiment discloses a method for preparing a thin secondary battery, including:

[0086]The positive electrode sheet is prepared, and the positive electrode sheet includes a positive electrode current collector. One side of the positive electrode current collector is provided with a positive electrode active material layer, and the other side is provided with a hot melt adhesive polymer material layer. In this embodiment, the specific steps for preparing the positive electrode sheet The steps of preparing the positive pole piece are the same as in Example 2, except that in this embodiment, the thickness of the positive pole piece 4 is 90 μm, the width is 42.2 mm, and the height is 25 mm.

[0087] Negative electrode sheet 10 is obtained, the negative electrode sheet includes a negative electrode current collector, and both sides of the negative electrode current collector are provided with a negative electrode active material laye...

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Abstract

The invention discloses a thin type secondary battery and a preparation method therefor. The thin type secondary battery comprises at least one positive electrode plate and at least one negative electrode plate; the positive electrode plate and the negative electrode plate are arranged at intervals in sequence; each electrode plate comprises a metal current collector; the thin type secondary battery is characterized in that an active material layer is arranged on one surface, facing to other electrode plates, of the metal current collector in the electrode plate on the outermost side, while a high polymer material layer is arranged on the other surface; and when the number of the electrode plates is greater than or equal to three, the two surfaces of the metal current collector of the middle electrode plate are both provided with the active material layer. According to the thin type secondary battery, only one surface of the electrode plate on the outermost side needs to be provided with the hot melt adhesive active material layer; one surface, which does not need the active material layer, of the metal current collector is provided with the high polymer material layer, so that stress caused by extension of the active material after rolling can be counteracted or partially counteracted, so that the problem of electrode plate rolling caused after the single surface of the electrode plate is coated and rolled can be solved; and in addition, the thin type secondary battery also can be subjected to thermal compounding with an aluminum plastic composite packaging film used for external packaging to form an integrated electrode.

Description

technical field [0001] The invention relates to the battery field, in particular to a thin secondary battery and a preparation method thereof. Background technique [0002] With the rapid development of electronic equipment technology, our requirements for batteries are also getting higher and higher. The new generation of batteries will inevitably develop towards ultra-thin and flexible, which has been fully reflected in wearable devices and RFID products. Ultra-thin battery, as the name suggests, is a battery with a very thin thickness. Now the thinnest battery can be made of aluminum-plastic flexible packaging lithium battery. [0003] Secondary batteries are also called rechargeable batteries or storage batteries. Aluminum-plastic flexible packaging lithium batteries are thin secondary batteries. Aluminum-plastic flexible packaging lithium batteries have high energy density, smaller size, ultra-thin, lightweight, high safety and Low cost and other obvious advantages. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04
CPCH01M10/0436H01M2220/30Y02E60/10Y02P70/50
Inventor 郭也平郑长明张承平郑洪荣浦坚
Owner HANGZHOU FUTURE POWER TECH
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