WO2018196300A1 - 一种锂电池隔离膜的加工工艺及加工设备 - Google Patents

一种锂电池隔离膜的加工工艺及加工设备 Download PDF

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Publication number
WO2018196300A1
WO2018196300A1 PCT/CN2017/107039 CN2017107039W WO2018196300A1 WO 2018196300 A1 WO2018196300 A1 WO 2018196300A1 CN 2017107039 W CN2017107039 W CN 2017107039W WO 2018196300 A1 WO2018196300 A1 WO 2018196300A1
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lithium battery
battery separator
winding
film backing
slitting
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PCT/CN2017/107039
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English (en)
French (fr)
Inventor
程跃
王治学
陈永乐
王连杰
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上海恩捷新材料科技股份有限公司
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Publication of WO2018196300A1 publication Critical patent/WO2018196300A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/403—Manufacturing processes of separators, membranes or diaphragms
    • H01M50/406—Moulding; Embossing; Cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention belongs to the field of lithium batteries, and particularly relates to a processing technology and processing equipment for a lithium battery separator.
  • lithium battery products Due to the high energy density, long cycle life, low self-discharge rate, no memory effect and green environmental protection, lithium battery products have been widely used in various industries, such as mobile phones. , portable computers, video cameras, cameras, electric cars, etc.
  • Lithium battery separator is one of the four key materials for lithium batteries. It is a material that connects and separates the positive and negative electrodes of the battery. It is an electronic insulator that prevents short circuits, but allows lithium ions to pass through. It can also pass when the battery is overheated. The closed cell function blocks the conduction of current in the battery.
  • the performance of the separator determines the interface structure and internal resistance of the lithium battery, which affects the key characteristics such as battery capacity, cycle life, charge and discharge current density. Therefore, the improvement of the performance of the separator plays an important role in improving the overall performance of the battery. effect.
  • the separator obtained by directly winding the separator has the following defects: the separator is easy to be used when the winding tension is small. Deviation, resulting in uneven winding, will also lead to the phenomenon of unwinding during the transportation process due to bumps; and when the winding tension is large, although the winding film end face is very uniform, there will be no unwinding phenomenon. However, there will be a bursting phenomenon, the film surface is not flat enough, affecting the yield of the product, and thus causing unnecessary waste.
  • the invention provides a processing technology and a processing device for a lithium battery separator, so as to solve the problem that the winding method of the existing separator causes the separator to be wound up, unwinding or bursting, and the film surface is uneven.
  • the present invention provides the following technical solutions:
  • a processing method of a lithium battery separator comprising: manufacturing a lithium battery separator and a winding process, characterized in that at least one film backing and the lithium battery separator are wound together in a winding process, and The film backing is located on an outer surface and/or an inner surface of the lithium battery separator.
  • the film backing has a smooth film surface and is free of foreign matter.
  • the film backing is a PET (polyethylene terephthalate) film.
  • the inner surface of the lithium battery separator refers to the surface facing inward after winding
  • the outer surface of the lithium battery separator refers to the surface facing outward after winding.
  • the method further comprises coating the lithium battery separator after the lithium battery separator is manufactured, and performing the winding process when the coating is completed (this may be called For "coating and winding").
  • the winding tension of the winding step is preferably larger than the winding tension of the lithium battery separator in which the film backing is not provided.
  • the winding tension of the winding step is preferably from 0.01 to 0.4 N/mm, and the length of the winding is preferably not more than 600 m. Since the film backing itself is relatively heavy and the number of meters is too long, the thickness is very thick after winding, and the inner layer is subjected to a large force, which is disadvantageous for improving the unwinding phenomenon. Therefore, the present invention preferably receives The length of the roll is no more than 600 meters.
  • the winding process has a slitting process, and the slitting process divides the lithium battery separator having a wide width after the winding into a web. a narrower lithium battery separator; in the case of a slitting process after the winding process, the slitting process includes slitting unwinding and slitting winding, wherein the tension of the slitting and winding is preferably The slitting and winding tension of the lithium battery separator which is not provided with the film backing is cut.
  • the slitting and winding tension of the slitting step is preferably 0.01 to 0.4 N/mm, and the length of the slitting and winding is preferably not more than 600 m. Since the film backing itself is relatively heavy and the number of meters is too long, the thickness is very thick after winding, and the inner layer is subjected to a large force, which is disadvantageous for improving the unwinding phenomenon. Therefore, the length of the winding of the present invention is preferably not more than 600 meters. .
  • the winding contact pressure of the slitting step is preferably larger than the winding contact pressure of the lithium battery separator slitting step in which the film backing is not provided.
  • the slitting contact pressure of the slitting process of the present invention ranges from 0.01 to 0.25 N/mm.
  • the width of the film backing is preferably equal to or greater than the width of the lithium battery separator. This ensures that the entire membrane surface of the lithium battery separator is in the protective range of the film backing, and the effect of protecting the membrane surface of the lithium battery separator is best.
  • the thickness of the film backing is preferably from 5 ⁇ m to 50 ⁇ m.
  • the thickness of the film backing affects the phenomenon of film surface blasting. If it is too thin, the PET film backing has a bad effect on the film blasting phenomenon; if the thickness is too thick, the raw material is wasted on the one hand, and the knives are discarded when cutting. .
  • the film backing may be placed above the lithium battery separator or may be placed in the lithium battery during winding in the winding and slitting process after manufacture. Below the membrane.
  • the lithium battery separator has two positions at the time of unwinding in the slitting process, that is, the film backing is disposed above the lithium battery separator or the film backing is disposed under the lithium battery separator .
  • the present invention also provides a processing apparatus for a lithium battery separator, comprising: at least one film backing unwinding device disposed at a winding of a lithium battery separator, the film backing unwinding device to make a film backing with the lithium The battery separator is wound together and the film backing is located on the outer and/or inner surface of the lithium battery separator.
  • One of the beneficial effects of the present invention is to provide a processing method for adding a film backing to a lithium battery separator according to the deficiencies of the prior art, wherein the film back surface of the lithium battery separator is smooth and free from foreign matter, At the time of winding, the lithium battery separator and the film backing are adsorbed together by the action of static electricity. Since the film surface of the film backing is smooth and smooth, the film surface of the lithium battery separator will also become flat after winding. The problem of the surface ribs is greatly reduced, and the yield of the lithium battery separator is improved.
  • the second beneficial effect of the present invention is that, in view of the deficiencies of the prior art, a processing method for adding a film backing to a lithium battery separator is provided, and the other conditions of the separator (the specification of the separator, the size of the winding core, etc.) are the same. Under the condition that the winding tension and the slitting and winding tension of the present invention are respectively larger than the winding tension of the lithium battery separator without the film backing, and the slitting and winding tension, the lithium battery separator of the present invention is received. More tightly, the possibility of the separator being unwound during transportation is greatly reduced.
  • the third beneficial effect of the present invention is that, in view of the deficiencies of the prior art, a processing method for adding a film backing to a lithium battery separator is provided, and the winding end face is prevented from being irregular due to the increase of the winding tension during the slitting and winding. .
  • FIG. 1 is a schematic view showing the PET film backing being wound up together with a lithium battery separator using the processing technique and processing apparatus of Example 1 of the present invention.
  • the existing method of directly winding the separator has the following defects: when the winding tension is small, it is easy to run off, resulting in uneven winding, and also causes in the transportation process because The bump causes the unwinding phenomenon; while the winding tension is large, although the end face of the lithium battery isolating film is very uniform, there will be no unwinding phenomenon, but there will be a bursting phenomenon, the film surface is not flat, and thus does not cause The necessary waste and loss, the yield rate is reduced.
  • the direction of the above defect improvement has not been studied and disclosed in the prior art.
  • the inventors have provided an improvement, and in particular, provide a processing technique and a processing apparatus for a lithium battery separator which is provided with a film backing at the time of winding.
  • the present invention provides a processing technology and a processing device for setting a backing structure of a lithium battery separator according to the deficiencies of the prior art.
  • the present invention is on the outer surface of the lithium battery separator when the lithium battery separator is wound up. Or a film backing is added to the inner surface, and the film backing and the lithium battery separator are wound together to prevent the problem of film explosion. Increasing the winding tension during winding and increasing the winding contact pressure in the slitting process can ensure that the end face after winding is aligned, and also prevent the separator from being unwound during transportation.
  • a PET film was used as the film backing.
  • the effect of the present invention is as follows: when the lithium battery separator film does not adopt the film backing structure, the lithium battery separator film has a bursting rate of 40%, and after the film backing structure, the lithium battery separator film bursts.
  • the rib ratio is basically 0; the lithium battery separator is not taken When using the film backing structure, the winding deviation and winding end face irregularity rate is 15%. After adopting the film backing structure, the lithium battery isolation film winding deviation and winding end face irregularity rate is about 2%; When the lithium battery separator is not in the film backing structure, the probability of unwinding is 5%. After the film backing structure, the lithium battery separator is unwound.
  • the processing method of the lithium battery separator of the present invention comprises: coating and manufacturing a lithium battery separator as a base film, and coating the lithium battery separator in the lithium battery separator
  • a PET film is added as a backing on the outer surface and/or the inner surface, the PET film backing and the lithium battery separator are wound together, and then slit, and the film surface of the PET film as a backing is flat and smooth. And no foreign matter.
  • the lithium battery separator is a PP or PE film that functions as a positive or negative electrode in a lithium battery.
  • the material of the film backing may be other similar or suitable materials in other embodiments in addition to PET.
  • FIG. 1 is a schematic view of a processing process and a processing apparatus of the present embodiment.
  • a PET film backing unwinding device is added at a coating and winding end of a lithium battery separator film, so that the PET film backing is located in a lithium battery isolation. Above the membrane and wound up with the lithium battery separator.
  • the PET film backing can also be placed under the lithium battery separator.
  • the coating winding tension is increased to be larger than the coating winding tension when the PET film backing is not added, and the winding tension is preferably 0.01- when the coating is wound. 0.4 N/mm.
  • the unwinding method can be used for both unwinding and unwinding, that is, the PET film backing can be placed above the lithium battery separator or can be placed in lithium.
  • the lower side of the battery separator similarly, when the lithium battery separator provided with the PET film backing of the embodiment is slit, the winding tension is larger than that of the lithium battery separator of the same specification without the PET film backing.
  • the tension preferably the winding tension when slitting and winding, is in the range of 0.01-0.4 N/mm.
  • the winding contact pressure of the lithium battery separator provided with the PET film backing in this embodiment is greater than the winding contact pressure of the lithium battery separator of the same specification without the PET film backing, and preferably the winding contact pressure The range is from 0.01 to 0.25 N/mm.
  • the structure of the lithium battery separator provided with the backing obtained by the processing method of the lithium battery separator of the present invention comprises a lithium battery separator and a PET film backing; the PET film backing may be placed above the lithium battery separator, or Below the lithium battery separator.
  • the end surface of the lithium battery separator is flat after winding, and does not occur during transportation.
  • the film phenomenon is relatively smooth and flat. During the winding process, the static electricity generated by the relative sliding between the PET film and the lithium battery separator will adsorb the PET film and the lithium battery separator, which will isolate the lithium battery. The film becomes flat, and the phenomenon of film blasting after slitting is greatly reduced.
  • lithium battery separator When a lithium battery manufacturer uses a lithium battery separator, it is only necessary to remove the PET film backing, leaving a lithium battery separator.
  • the backing structure of the lithium battery separator does not affect the normal use of the lithium battery separator.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • General Chemical & Material Sciences (AREA)
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  • Cell Separators (AREA)
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Abstract

本发明公开了一种锂电池隔离膜的加工工艺及加工设备，该加工工艺包括制造锂电池隔离膜以及收卷工序；其特征在于，在收卷工序中将至少一层薄膜背衬和所述锂电池隔离膜一起收卷，并且所述薄膜背衬位于所述锂电池隔离膜的外表面或内表面。本发明的锂电池隔离膜的加工设备包括：设置在锂电池隔离膜涂布收卷处的至少一个薄膜背衬放卷装置，该薄膜背衬放卷装置使薄膜背衬随所述锂电池隔离膜一起收卷并且所述薄膜背衬收卷时位于所述锂电池隔离膜的外表面或内表面。本发明解决了现有锂电池隔离膜收卷不齐、脱卷或爆筋、膜面不平整的问题。

Description

一种锂电池隔离膜的加工工艺及加工设备 技术领域
本发明属于锂电池领域，具体涉及一种锂电池隔离膜的加工工艺及加工设备。
背景技术
由于锂电池具有能量密度高、循环寿命长、自放电率小、无记忆效应和绿色环保等优点，再加上锂电池科技的不断进步，锂电池产品已经广泛应用于各行各业，如移动电话、便携式计算机、摄像机、照相机、电动汽车等。
锂电池隔离膜作为锂电池四大关键材料之一，是连接并隔开电池正负极的材料，是电子的绝缘体，可以防止出现短路，但允许锂离子通过，还可以在电池过热时，通过闭孔功能来阻隔电池中的电流传导。隔离膜性能的优劣决定着锂电池的界面结构和内阻，进而影响着电池的容量、循环寿命、充放电电流密度等关键特性，因此隔离膜性能的提高对于提高电池的综合性能起着重要作用。
目前国内外锂电池隔离膜厂商在生产隔离膜之后通常是直接将隔离膜进行收卷，采用直接将隔离膜进行收卷的方法得到的隔离膜存在以下缺陷：隔离膜在收卷张力较小时容易跑偏，造成收卷不齐，还会导致在运输的过程中因为颠簸造成脱卷现象；而在收卷张力较大时，虽然隔离膜收卷端面很齐，也不会有脱卷现象，但会有爆筋现象出现，膜面不够平整，影响制品良率，进而造成不必要的浪费。
发明内容
本发明提供一种锂电池隔离膜的加工工艺及加工设备，以解决现有隔离膜的收卷方法导致隔离膜收卷不齐、脱卷或爆筋、膜面不平整的问题。
为了实现上述目的，本发明提供了如下技术方案：
一种锂电池隔离膜的加工工艺，包括：制造锂电池隔离膜以及收卷工序，其特征在于，在收卷工序中将至少一层薄膜背衬和所述锂电池隔离膜一起收卷，并且所述薄膜背衬位于所述锂电池隔离膜的外表面和/或内表面。
优选地，所述薄膜背衬的膜面平整光滑，且无异物。优选所述薄膜背衬为PET(聚对苯二甲酸乙二酯)薄膜。其中，所述锂电池隔离膜的内表面指的是收卷后朝内的面，所述锂电池隔离膜的外表面指的是收卷后朝外的面。通过该加工工艺，本发明达到了如下技术效果：增强锂电池隔离膜的膜面平整度、以及防止锂电池隔离膜出现爆筋现象。
在根据本发明的锂电池隔离膜的加工工艺中，还包括在制造锂电池隔离膜之后对所述锂电池隔离膜进行涂布，在涂布完成时进行所述收卷工序(这时可称为“涂布收卷”)。
在根据本发明的锂电池隔离膜的加工工艺中，所述收卷工序的收卷张力优选大于未设置所述薄膜背衬的锂电池隔离膜的收卷张力。通过收卷张力的上述设置，使锂电池隔离膜收的更紧，隔离膜在运输的过程中发生脱卷现象的可能性大大降低。
在根据本发明的锂电池隔离膜的加工工艺中，所述收卷工序的收卷张力优选为0.01-0.4N/mm，所述收卷的长度优选不大于600米。由于薄膜背衬本身比较重，米数太长的话，收卷后厚度很厚、内层受到的力很大，对改善其脱卷现象不利，因此，本发明优选收 卷的长度不大于600米。
在根据本发明的锂电池隔离膜的加工工艺中，通常所述收卷工序之后具有分切工序，所述分切工艺是将收卷后的幅宽较宽的锂电池隔离膜分切为幅宽较窄的锂电池隔离膜；在所述收卷工序之后具有分切工序的情况下，所述分切工序包括分切放卷和分切收卷，其中所述分切收卷的张力优选大于未设置所述薄膜背衬的锂电池隔离膜分切时的分切收卷张力。通过收卷张力的上述设置，使锂电池隔离膜收的更紧，隔离膜在运输的过程中发生脱卷现象的可能性大大降低。
在根据本发明的锂电池隔离膜的加工工艺中，所述分切工序的分切收卷张力优选为0.01-0.4N/mm，所述分切收卷的长度优选不大于600米。由于薄膜背衬本身比较重，米数太长的话，收卷后厚度很厚、内层受到的力很大，对改善其脱卷现象不利，因此，本发明优选收卷的长度不大于600米。
在本发明的锂电池隔离膜的加工工艺中，所述分切工序的收卷接触压优选大于未设置薄膜背衬的锂电池隔离膜分切工序的收卷接触压。优选地，本发明的所述分切工序的收卷接触压范围为0.01-0.25N/mm。
在根据本发明的锂电池隔离膜的加工工艺中，所述薄膜背衬的幅宽优选大于等于锂电池隔离膜的幅宽。这样能够确保锂电池隔离膜的整个膜面都在薄膜背衬的保护范围中，起到最好的保护锂电池隔离膜膜面的效果。
在根据本发明的锂电池隔离膜的加工工艺中，所述薄膜背衬的厚度优选为5μm-50μm。薄膜背衬的厚度影响膜面爆筋现象，太薄的话PET薄膜背衬对膜面爆筋现象的改善效果不好；厚度太厚的话，一方面浪费原料，另一方面在分切时废刀。
在根据本发明的锂电池隔离膜的加工工艺中，在制造后的收卷和分切工序中的收卷时，薄膜背衬可以置于锂电池隔离膜的上方，也可以置于锂电池隔离膜的下方。具体而言，所述锂电池隔离膜在分切工序放卷时薄膜背衬有两种设置位置，即薄膜背衬设置在锂电池隔离膜的上方或薄膜背衬设置在锂电池隔离膜的下方。
本发明还提供一种锂电池隔离膜的加工设备，包括：设置在锂电池隔离膜收卷处的至少一个薄膜背衬放卷装置，该薄膜背衬放卷装置使薄膜背衬随所述锂电池隔离膜一起收卷并且所述薄膜背衬收卷时位于所述锂电池隔离膜的外表面和/或内表面。
本发明的有益效果之一在于：针对现有技术的不足，提供对锂电池隔离膜增加薄膜背衬的加工工艺，该锂电池隔离膜的薄膜背衬的膜面平整光滑，且无异物，在收卷时，锂电池隔离膜和薄膜背衬在静电的作用下会吸附在一起，由于薄膜背衬的膜面平整光滑，在收卷后锂电池隔离膜的膜面也会变得平整，膜面爆筋的问题大大减少，提高了锂电池隔离膜的良品率。
本发明的有益效果之二在于：针对现有技术的不足，提供对锂电池隔离膜增加薄膜背衬的加工工艺，在隔离膜其它条件(隔离膜的规格，收卷卷芯尺寸等)都相同的条件下，由于本发明的收卷张力、分切收卷张力分别大于未设置薄膜背衬的锂电池隔离膜的收卷张力、分切收卷张力，因此本发明的锂电池隔离膜收的更紧，隔离膜在运输的过程中发生脱卷现象的可能性大大降低。
本发明的有益效果之三在于：针对现有技术的不足，提供对锂电池隔离膜增加薄膜背衬的加工工艺，由于在分切收卷时加大收卷张力，可以防止收卷端面不齐。
当然，实施本发明的任一产品并不一定需要同时达到以上所述的所有优点。
附图说明
图1为使用本发明实施例1的加工工艺及加工设备使PET薄膜背衬随锂电池隔离膜一起收卷的示意图。
具体实施方式
在锂电池隔离膜的制造工艺中，直接将隔离膜进行收卷的现有方法存在以下缺陷：在收卷张力较小时容易跑偏，造成收卷不齐，还会导致在运输的过程中因为颠簸造成脱卷现象；而在收卷张力较大时，虽然锂电池隔离膜收卷端面很齐，也不会有脱卷现象，但会有爆筋现象出现，膜面不够平整，进而造成不必要的浪费和损耗，良品率降低。关于上述缺陷改进的方向在现有技术中尚未有人进行研究和披露。
针对上述缺陷，本发明人提供了改进方案，具体提供了一种在收卷时设置薄膜背衬的锂电池隔离膜的加工工艺及加工设备。
本发明针对现有技术的不足，提供一种设置锂电池隔离膜背衬结构的加工工艺和加工设备，本发明在锂电池隔离膜收卷时，在所述锂电池隔离膜的外表面和/或内表面加入一层薄膜背衬，将所述薄膜背衬和所述锂电池隔离膜一起收卷，可以防止膜面爆筋的问题。在收卷时加大收卷张力以及在分切工序中增加收卷接触压，可保证收卷后的端面齐整，还可以防止隔离膜在运输路途中发生脱卷现象。在本发明的以下实施例中，采用PET薄膜作为薄膜背衬。
经发明人实验验证，证实本发明的效果如下：在锂电池隔离膜未采用薄膜背衬结构时，锂电池隔离膜爆筋率为40％，而采用薄膜背衬结构后，锂电池隔离膜爆筋率基本为0；在锂电池隔离膜未采 用薄膜背衬结构时，收卷跑偏和收卷端面不齐率为15％，采用薄膜背衬结构后，锂电池隔离膜收卷跑偏和收卷端面不齐率约为2％；在锂电池隔离膜未采用薄膜背衬结构时，发生脱卷现象概率为5％，采用薄膜背衬结构后，锂电池隔离膜发生脱卷现象基本为0。
下面结合具体实施例，进一步阐述本发明。应该理解，这些实施例仅用于说明本发明，而不用于限定本发明的保护范围。在实际应用中本领域技术人员根据本发明做出的改进和调整，仍属于本发明的保护范围。在本文中，由「一数值至另一数值」表示的范围，是一种避免在说明书中一一列举该范围中的所有数值的概要性表示方式。因此，某一特定数值范围的记载，涵盖该数值范围内的任意数值以及由该数值范围内的任意数值界定出的较小数值范围，如同在说明书中明文写出该任意数值和该较小数值范围一样。
实施例1
本发明的锂电池隔离膜的加工工艺，包括：将制造得到的锂电池隔离膜作为基膜并对其进行涂布，在锂电池隔离膜涂布收卷时，在所述锂电池隔离膜的外表面和/或内表面增加一层PET薄膜作为背衬，将所述PET薄膜背衬和锂电池隔离膜一起收卷，再进行分切，并且作为背衬的PET薄膜的膜面平整光滑，且无异物。所述锂电池隔离膜为锂电池中起到隔开正负极作用的PP或PE膜。薄膜背衬的材料除了选用PET之外，在其他实施例中可选用其他类似或合适的材料。
请参见图1，为本实施例的加工工艺和加工设备的示意图，图1中，在锂电池隔离膜涂布收卷处增加PET薄膜背衬放卷装置，让PET薄膜背衬位于锂电池隔离膜的上方并随锂电池隔离膜一起收卷。除图1中所显示的PET薄膜背衬置于锂电池隔离膜上方的方式之外，PET薄膜背衬还可以置于锂电池隔离膜下方。
对于本实施例而言，加PET薄膜背衬后增加涂布收卷张力，使其大于未加PET薄膜背衬时的涂布收卷张力，优选涂布收卷时收卷张力范围为0.01-0.4N/mm。
涂布收卷后，进行分切，分切时的放卷方式既可采用上放卷，也可采用下放卷，即PET薄膜背衬可以置于锂电池隔离膜的上方，也可以置于锂电池隔离膜的下方；同样，对本实施例的设有PET薄膜背衬的锂电池隔离膜分切时，收卷张力大于无PET薄膜背衬的同规格的锂电池隔离膜分切时的收卷张力，优选分切收卷时收卷张力范围为0.01-0.4N/mm。并且，本实施例的设有PET薄膜背衬的锂电池隔离膜分切时的收卷接触压大于无PET薄膜背衬的同规格的锂电池隔离膜的收卷接触压，优选收卷接触压范围为0.01-0.25N/mm。
使用本发明的锂电池隔离膜的加工工艺得到的设有背衬的锂电池隔离膜的结构包括锂电池隔离膜和PET薄膜背衬；PET薄膜背衬可以置于锂电池隔离膜上方，或置于锂电池隔离膜下方。
由于本实施例得到的设有背衬的锂电池隔离膜在涂布收卷、分切时收卷张力更大，收卷后锂电池隔离膜端面很平整，也不会在运输过程中发生脱卷现象；而且PET薄膜比较光滑平整，在收卷过程中，由于PET薄膜与锂电池隔离膜之间发生相对滑动产生的静电会将PET薄膜与锂电池隔离膜吸附在一起，会使得锂电池隔离膜变得平整，分切后膜面爆筋的现象大大减少。
在锂电池厂商使用锂电池隔离膜时，只需将PET薄膜背衬去掉，留下锂电池隔离膜即可，锂电池隔离膜的背衬结构不会影响锂电池隔离膜的正常使用。
根据上述说明书的揭示和教导，本发明所属领域的技术人员还能够对上述实施方式进行变更和修改。因此，本发明并不局限于上 述的具体实施方式，凡是本领域技术人员在本发明的基础上所作出的任何显而易见的改进、替换或变型均属于本发明的保护范围。此外，尽管本说明书中使用了一些特定的术语，但这些术语只是为了方便说明，并不对本发明构成任何限制。

Claims (13)

  1. 一种锂电池隔离膜的加工工艺，包括制造锂电池隔离膜以及收卷工序，其特征在于，在收卷工序中将至少一层薄膜背衬和所述锂电池隔离膜一起收卷，并且所述薄膜背衬位于所述锂电池隔离膜的外表面和/或内表面。
  2. 如权利要求1所述的锂电池隔离膜的加工工艺，其特征在于，所述收卷工序的收卷张力大于未设置所述薄膜背衬的锂电池隔离膜的收卷张力。
  3. 如权利要求1或2所述的锂电池隔离膜的加工工艺，其特征在于，所述收卷工序中的收卷张力为0.01-0.4N/mm，所述收卷的长度不大于600米。
  4. 如权利要求1所述的锂电池隔离膜的加工工艺，其特征在于，所述收卷工序之后具有分切工序，所述分切工序包括分切放卷和分切收卷，其中所述分切收卷的张力大于未设置所述薄膜背衬的锂电池隔离膜分切时的分切收卷张力。
  5. 如权利要求4所述的锂电池隔离膜的加工工艺，其特征在于，所述分切工序的分切收卷张力为0.01-0.4N/mm，所述分切收卷的长度不大于600米。
  6. 如权利要求4所述的锂电池隔离膜的加工工艺，其特征在于，所述分切工序的分切收卷接触压大于未设置所述薄膜背衬的锂电池隔离膜分切工序的分切收卷接触压。
  7. 如权利要求6所述的锂电池隔离膜的加工工艺，其特征在于，所述分切工序的分切收卷接触压为0.01-0.25N/mm。
  8. 如权利要求1所述的锂电池隔离膜的加工工艺，其特征在于， 所述薄膜背衬的幅宽大于等于所述锂电池隔离膜的幅宽。
  9. 如权利要求1所述的锂电池隔离膜的加工工艺，其特征在于，所述薄膜背衬的厚度为5μm-50μm。
  10. 如权利要求1所述的锂电池隔离膜的加工工艺，其特征在于，所述薄膜背衬的膜面平整光滑，且无异物。
  11. 如权利要求1所述的锂电池隔离膜的加工工艺，其特征在于，所述工艺还包括在制造锂电池隔离膜之后对所述锂电池隔离膜进行涂布，在涂布完成时进行所述收卷工序。
  12. 如权利要求1所述的锂电池隔离膜的加工工艺，其特征在于，所述薄膜背衬是PET膜。
  13. 一种锂电池隔离膜的加工设备，其特征在于，包括：设置在锂电池隔离膜涂布收卷处的至少一个薄膜背衬放卷装置，使薄膜背衬随所述锂电池隔离膜一起收卷并且所述薄膜背衬收卷时位于所述锂电池隔离膜的外表面或内表面。
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