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Lithium battery diaphragm stretching forming device and method as well as lithium battery diaphragm

A lithium battery separator and stretch forming technology, applied in lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problems of high product shrinkage, necking, and unsatisfactory pore uniformity of lithium battery separators. Achieve the effect of small shrinkage, uniform distribution, and no necking

Active Publication Date: 2013-08-28
WUHAN BOSHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a lithium battery diaphragm stretching forming device, method and lithium battery diaphragm, aiming at solving the problem of unsatisfactory pore uniformity of the lithium battery diaphragm obtained by the existing lithium battery diaphragm stretching method , technical problems of high product shrinkage and serious necking

Method used

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  • Lithium battery diaphragm stretching forming device and method as well as lithium battery diaphragm
  • Lithium battery diaphragm stretching forming device and method as well as lithium battery diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0025] figure 1 A schematic diagram of a stretching and forming device for a lithium battery separator provided by an embodiment of the present invention is shown, and only parts related to the embodiment of the present invention are shown for convenience of description.

[0026] The lithium battery separator stretching forming device provided in this embodiment includes a plurality of stretching rollers, and the number of stretching rollers is greater than 3, such as figure 1 As shown in the black part, as an implementation, figure 1 It includes six stretching rollers, the white part around the stretching rollers is the film substrate, and the part where the six arrows point to the stretching rollers in the figure is the part where the stretching rollers stretch the film substrate. The force points are points a to f respectively, and the distance between adjacent force points is the stretching gap, as shown in the figure, the distance between points a and b, the distance bet...

Embodiment 2

[0030] figure 2 The flow chart of the lithium battery separator stretching forming method provided by the embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0031] The lithium battery diaphragm stretching method provided in this embodiment includes:

[0032] Step S201, crystallize the hot-melt polymer to prepare a film substrate.

[0033] Firstly, the polymer particles are melted and extruded, and then subjected to crystallization treatment to obtain a film substrate. At this time, the film substrate has a wafer structure.

[0034] Step S202 , the film substrate is introduced into the lithium battery separator stretching forming device as described in the above embodiment, and the adjacent stretching rollers stretch the film substrate step by step with small gaps.

[0035] After the film substrate is stretched and formed with small gaps and multi-stages, the wafers a...

Embodiment 3

[0040] The implementation example of the present invention provides a lithium battery diaphragm prepared by the method described in Example 2. After testing, compared with the lithium battery film obtained by the existing large-gap stretching method, the lithium battery diaphragm has a uniform pore size, Uniform distribution, good flatness of the diaphragm, small shrinkage rate, and no necking phenomenon. Ultimately, the lithium battery manufactured by using the lithium battery thin film provided in this embodiment has better overall performance and longer service life.

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Abstract

The invention is suitable for the technical field of lithium batteries, and provides a lithium battery diaphragm stretching forming device and method as well as a lithium battery diaphragm. The device comprises multiple stretching rollers, wherein a stretching gap between the adjacent stretching rollers is 50-100 mm, and the quantity of the rollers is more than three. The method comprises the following steps of: carrying out crystallization on hot melting high polymer to obtain a film substrate, guiding the film substrate into the lithium battery diaphragm stretching forming device, carrying out small-gap step-by-step stretch on the film substrate by the adjacent stretching rollers, and carrying out heat treatment on the film substrate after stretching, thus manufacturing the lithium battery diaphragm. According to the invention, a small-gap multi-stage stretching method is adopted, the sizes of holes of the manufactured lithium battery diaphragm are unified, the distribution is uniform, the diaphragm flatness is good, the shrinking percentage is small, and a necking phenomenon can not appear.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a lithium battery diaphragm stretching forming device and method, and the lithium battery diaphragm. Background technique [0002] In the structure of lithium batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. The separator material is non-conductive. A high-strength thin-film polyolefin porous membrane is used. The main function of the separator is to separate the positive and negative electrodes of the battery, prevent the two electrodes from contacting and short circuit, play the role of establishing voltage, and at the same time have the funct...

Claims

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Application Information

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IPC IPC(8): B29C55/14H01M2/14H01M10/052
CPCY02E60/10
Inventor 詹智勇
Owner WUHAN BOSHENG TECH
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