WO2017219219A1 - 结构胶纸 - Google Patents
结构胶纸 Download PDFInfo
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- WO2017219219A1 WO2017219219A1 PCT/CN2016/086499 CN2016086499W WO2017219219A1 WO 2017219219 A1 WO2017219219 A1 WO 2017219219A1 CN 2016086499 W CN2016086499 W CN 2016086499W WO 2017219219 A1 WO2017219219 A1 WO 2017219219A1
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- adhesive
- adhesive tape
- structural adhesive
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- the invention relates to the technical field of adhesive tape, in particular to a structural adhesive tape.
- the active material on the cathode/anode sheet is often removed by laser cleaning to expose a predetermined area for welding the tabs on the current collector.
- an object of the present invention is to provide a structural adhesive tape which can reserve a reserved area for forming a tab on a current collector when the structural adhesive tape is used in a secondary battery. Moreover, the tab welding in the reserved area is firm and not easy to fall off, thereby effectively improving the safety performance of the secondary battery.
- the present invention provides a structural adhesive tape comprising: a first adhesive layer containing a first adhesive and used for adhering to an object to be bonded;
- the magnetic material layer contains a magnetic material and is disposed on a side of the first adhesive layer away from the object to be bonded.
- a reserved area for forming a tab is reserved on the current collector, and the tabs in the reserved area are welded firmly and are not easily peeled off, thereby effectively improving the second Secondary battery safety performance.
- Figure 1 is a schematic cross-sectional view showing an embodiment of a structural adhesive tape of the present invention
- Figure 2 is a schematic cross-sectional view showing another embodiment of the structural adhesive tape of the present invention.
- Figure 3 is a schematic cross-sectional view showing still another embodiment of the structural adhesive tape of the present invention.
- Figure 4 is a schematic cross-sectional view showing still another embodiment of the structural adhesive tape of the present invention.
- Figure 5 is a schematic cross-sectional view of an alternative embodiment of Figure 1;
- Figure 6 is a schematic cross-sectional view of an alternative embodiment of Figure 2;
- Figure 7 is a schematic cross-sectional view of an alternative embodiment of Figure 3.
- Figure 8 is a schematic cross-sectional view of an alternative embodiment of Figure 4.
- Figure 9 is a schematic cross-sectional view of another alternative embodiment of Figure 3.
- Figure 10 is a schematic cross-sectional view of another alternative embodiment of Figure 4.
- Figure 11 is a schematic cross-sectional view of still another alternative embodiment of Figure 3.
- Figure 12 is a schematic cross-sectional view of still another alternative embodiment of Figure 4.
- Figure 13 is a cross-sectional view of the pole piece, wherein the structural adhesive paper adhered to the current collector is not peeled off;
- Figure 14 is a cross-sectional view of the pole piece, wherein the structural adhesive paper adhered to the current collector has been peeled off and welded to the tab;
- Figure 15 is a view of Figure 14 as seen from above the plane perpendicular to the paper.
- a structural adhesive tape includes: a first adhesive layer 1 containing a first adhesive and used for pasting on an object to be bonded; and a magnetic material layer 2, The magnetic material 21 is contained and disposed on a side of the first adhesive layer 1 away from the object to be bonded.
- the first adhesive layer 1 has a thickness of from 5 ⁇ m to 60 ⁇ m.
- the magnetic material layer 2 has a thickness of from 5 ⁇ m to 60 ⁇ m.
- the first adhesive in the first adhesive layer 1 is selected from the group consisting of FIG. 1, FIG. 3, FIG. Hot melt adhesive 11.
- the hot-melt adhesive refers to an adhesive which is solid at room temperature, heated and melted into a liquid state, coated and wetted by a bonded object, and then pressed and cooled to complete bonding.
- the hot melt adhesive can be repeatedly melted and bonded, which reduces viscosity or even loses viscosity at high temperatures.
- the hot-melt adhesive 11 can adhere the structural adhesive tape to the object to be bonded (such as a current collector), and when the structural adhesive tape needs to be peeled off from the object to be bonded,
- the hot-melt adhesive 11 can be melted and flowed by applying a certain temperature (such as 50 ° C to 150 ° C) to reduce the viscosity or even lose the viscosity and shrink, and then the magnetic material 21 in the magnetic material layer 2 can be applied by the external magnetic source.
- a certain temperature such as 50 ° C to 150 ° C
- the hot melt adhesive 11 is selected from the group consisting of a polyolefin hot melt adhesive, a polyurethane hot melt adhesive, an ethylene and a copolymer thereof, a hot melt adhesive, and a polyester.
- a polyolefin hot melt adhesive a polyurethane hot melt adhesive
- an ethylene and a copolymer thereof a hot melt adhesive
- a polyester a polyester
- hot melt adhesive polyamide hot melt adhesive
- styrene and its block copolymer hot melt adhesive is selected from the group consisting of ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA), ethylene-vinyl acetate.
- EVA ethylene-vinyl acetate copolymer
- EAA ethylene-ethyl acrylate copolymer
- EAA ethylene-acrylic acid copolymer
- the polyolefin hot melt adhesive is selected from one or more of polyethylene and polypropylene.
- the styrene and its block copolymer hot melt adhesive are selected from the group consisting of styrene - One or more of butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS).
- the first adhesive layer 1 further includes blowing agent particles 12, The blowing agent particles 12 are distributed over the first adhesive (not shown).
- the first adhesive may be selected from one or more of an acrylic resin adhesive, a fluororesin adhesive, a general-purpose two-component polyurethane adhesive, a rubber adhesive, and a thermosetting resin adhesive.
- the blowing agent particles 12 are selected from a physical foaming agent and/or a chemical foaming agent.
- the physical blowing agent is selected from one or more of an isopentane blowing agent, an isobutane blowing agent, and a cyclopentane blowing agent.
- the chemical blowing agent is selected from the group consisting of azodicarbonamide, azobisisobutyronitrile, N,N-dinitrosopentamethylenetetramine, 4,4'-oxobisbenzenesulfonyl hydrazide, One or more of tosylhydrazide.
- the particle size of the blowing agent particles 12 is from 5 ⁇ m to 30 ⁇ m.
- the magnetic material 21 is selected from one or more of a permanent magnetic material and a soft magnetic material.
- the magnetic material 21 is selected from the group consisting of pure iron, iron silicon alloy, iron aluminum alloy, iron silicon aluminum alloy, nickel iron alloy, iron cobalt alloy, soft ferrite, amorphous soft magnetic alloy, super One or more of a microcrystalline soft magnetic alloy, a neodymium iron boron rare earth alloy, a ferrite permanent magnet material, an aluminum nickel cobalt permanent magnet alloy, and an iron chromium cobalt permanent magnet alloy.
- the magnetic material layer 2 may be a sheet-like structure, and the magnetic material layer 2 contains only the magnetic material 21. That is, the magnetic material layer 2 is a sheet-like structure made only of the magnetic material 21.
- the magnetic material layer 2 is in the form of a foil made of the magnetic material 21.
- the magnetic material layer 2 is directly disposed on the side of the first adhesive layer 1 away from the object to be bonded.
- the magnetic material layer 2 further contains a third adhesive 22, and the magnetic material 21 is distributed in the third In the adhesive 22, the first substrate 4 is provided on the side of the magnetic material layer 2 away from the object to be bonded.
- the structure of the magnetic material 21 is selected from the group consisting of a sheet structure, a granular structure, a filament structure, and a network structure. One or several.
- the content of the magnetic material 21 is 30% to 75% of the total mass of the magnetic material layer 2.
- the third adhesive 22 is selected from the group consisting of rubber adhesives, general-purpose two-component polyurethane adhesives, acrylic adhesives, and fluororesin adhesives.
- the first substrate 4 is selected from the group consisting of polyethylene terephthalate.
- the first base material 4 has a thickness of 5 ⁇ m to 30 ⁇ m.
- the structural adhesive sheet further comprises: a second adhesive layer 3, and the second adhesive layer 3 comprises a second adhesive
- the agent does not contain blowing agent particles.
- the second adhesive layer 3 is disposed between the first adhesive layer 1 formed of the hot melt adhesive 11 and the magnetic material layer 2 containing only the magnetic material 21.
- the second adhesive layer 3 is disposed between the first adhesive layer 1 containing the blowing agent particles 12 and the magnetic material layer 2 containing only the magnetic material 21.
- the second adhesive layer 3 is disposed between the first adhesive layer 1 formed of the hot melt adhesive 11 and the magnetic material layer 2 containing the third adhesive 22. Referring to FIG.
- the second adhesive layer 3 is disposed between the first adhesive layer 1 containing the blowing agent particles 12 and the magnetic material layer 2 containing the third adhesive 22. This can further ensure the bonding effect between the first adhesive layer 1 and the magnetic material layer 2, and avoid accidental loss of adhesion between the first adhesive layer 1 and the magnetic material layer 2.
- the second adhesive in the second adhesive layer 3 is selected from the group consisting of an acrylic resin adhesive, a fluororesin adhesive, and a universal double.
- an acrylic resin adhesive a fluororesin adhesive
- a universal double One or more of a component of a polyurethane adhesive, a rubber adhesive, and a thermosetting resin.
- the second adhesive layer 3 has a thickness of from 5 ⁇ m to 60 ⁇ m.
- the structural adhesive tape further comprises: a second substrate 5.
- the second substrate 5 is disposed between the first adhesive layer 1 formed of the hot melt adhesive 11 and the magnetic material layer 2 containing the third adhesive 22.
- the second substrate 5 is disposed between the first adhesive layer 1 containing the blowing agent particles 12 and the magnetic material layer 2 containing the third adhesive 22.
- the second substrate 5 is disposed between the second adhesive layer 3 and the magnetic material layer 2 containing the third adhesive 22.
- the second substrate 5 is selected from the group consisting of polyethylene terephthalate.
- the second substrate 5 has a thickness of from 5 ⁇ m to 30 ⁇ m.
- a curing agent may also be included in the first adhesive layer 1.
- a curing agent may also be included in the second adhesive layer 3.
- the curing agent is one or more selected from the group consisting of an aliphatic polyamine, an alicyclic polyamine, a polyamide, a modified aromatic amine, and an isocyanate.
- the structural adhesive tape is pasted on the pole piece 7.
- the pole piece 7 includes a current collector 71 and an active material layer 72.
- the structural adhesive tape is attached to the current collector 71, that is, the object to be bonded is the current collector 71.
- the first adhesive layer 1 of the structural adhesive tape is pasted on the tab receiving groove G of the current collector 71 forming the tab 6 when in the set
- the active material layer 72 is dried. After the drying is completed, the structural adhesive tape is peeled off to form the tab accommodation groove G of the tab 6.
- the first adhesive of the structural adhesive paper is also applied before the active material layer 72 is coated on the other surface of the current collector 71 with reference to FIGS. 13 to 15.
- the layer 1 is adhered to the mating recess R of the current collector 71 opposite to the tab accommodation groove G forming the tab 6
- the active material layer 72 is applied to the other surface of the current collector 71 after the active material layer 72 is applied.
- the layer 72 is dried. After the drying is completed, the structural adhesive tape at the mating recess R is peeled off to form a mating recess R that is opposite to the tab receiving groove G of the tab 6.
- the arrangement of the mating recesses R facilitates ultrasonic welding of the tabs 6 in the tab receiving grooves G.
- the fluororesin-based adhesive is selected from the group consisting of polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), and ethylene-chlorotrifluoroethylene copolymer.
- PTFE polytetrafluoroethylene
- PCTFE polychlorotrifluoroethylene
- ECTFE ethylene-tetrafluoroethylene copolymer
- PVDF polyvinylidene fluoride
- PVDF polyvinylidene fluoride
- PVDF polyvinyl chloride
- the rubber-based adhesive is one or more selected from the group consisting of neoprene, nitrile rubber, styrene-butadiene rubber, butyl rubber, fluororubber, and silicone rubber.
- the thermosetting resin-based adhesive is one or more selected from the group consisting of a phenol resin, a urea resin, an epoxy resin, and an amino resin.
- a mixture of granular magnetic material pure iron and nickel-iron alloy is added to molten polyvinylidene fluoride, stirred uniformly at a rotational speed of 40 rpm to 60 rpm, and coated on the first substrate PET by a doctor blade (thickness)
- a magnetic material layer was formed on 19 ⁇ m), the coating thickness was controlled to be 30 ⁇ m, and the content of the granular magnetic material in the magnetic material layer was 50%.
- the first adhesive layer is prepared by stirring a blowing agent cyclopentane (foaming temperature of 120 ° C to 130 ° C) with an acrylate resin adhesive and ethyl acetate at a temperature of 40 rpm to 60 rpm. The slurry was stirred for 30 min. A slurry of the first adhesive layer was coated on the above magnetic material layer, and a coating thickness of 50 ⁇ m was controlled, and dried by heating to remove the solvent to obtain a first adhesive layer.
- a blowing agent cyclopentane foaming temperature of 120 ° C to 130 ° C
- the slurry was stirred for 30 min.
- a slurry of the first adhesive layer was coated on the above magnetic material layer, and a coating thickness of 50 ⁇ m was controlled, and dried by heating to remove the solvent to obtain a first adhesive layer.
- the first adhesive layer was aged by heating to 45 ° C, and the aging time was 60 h to complete the preparation of the structural adhesive tape.
- the structural adhesive tape is pasted to a preset position of the current collector 71, and then the application of the active material layer 72 is performed. After the coating is completed, the pole piece 7 is sent to an oven for drying (oven temperature 80 ° C to 150 ° C).
- the foaming agent cyclopentane in the structural adhesive paper is foamed by heat, and the first adhesive layer and the current collector 72 are separated to lose the bonding, and the active material layer 72 flows through the oven and is still wet.
- the structural adhesive paper is removed together with the active material layer 72 thereon, thereby exposing the tab receiving groove G for the lug 6 to be welded.
- the cathode tab and the anode tab were welded in the above manner, and the prepared cathode tab and anode tab were fabricated into a lithium ion secondary battery.
- a mixture of granular magnetic material pure iron and nickel-iron alloy is added to molten polyvinylidene fluoride, stirred uniformly at a rotational speed of 40 rpm to 60 rpm, and coated on the first substrate PET by a doctor blade (thickness)
- a magnetic material layer was formed on 19 ⁇ m), the coating thickness was controlled to be 30 ⁇ m, and the content of the granular magnetic material in the magnetic material layer was 50%.
- the EVA hot melt adhesive and toluene were stirred at a temperature of 40 rpm to 60 rpm to prepare a slurry of the first adhesive layer at room temperature, and the stirring time was 30 min.
- a slurry of the first adhesive layer was coated on the above magnetic material layer, and a coating thickness of 50 ⁇ m was controlled, and dried by heating to remove the solvent to obtain a first adhesive layer.
- the first adhesive layer was aged by heating to 45 ° C, and the aging time was 60 h to complete the preparation of the structural adhesive tape.
- the structural adhesive tape is pasted to a preset position of the current collector 71, and then the application of the active material layer 72 is performed.
- the pole piece 7 is sent to an oven for drying (oven temperature 80 ° C to 150 ° C).
- the EVA hot melt adhesive in the structural adhesive paper melts and then the viscosity is reduced and contracted, so that the first adhesive layer and the current collector 72 are separated to lose the bond, and the active material layer 72 flows through the oven and is still wet.
- an external magnetic source is applied to adsorb the magnetic material layer in the structural adhesive paper, so that the structural adhesive paper is removed together with the active material layer 72 thereon, thereby exposing the tab receiving groove G for welding the tab 6 .
- the cathode tab and the anode tab were welded in the above manner, and the prepared cathode tab and anode tab were fabricated into a lithium ion secondary battery.
- the lens receiving groove is cleaned on the pole piece by laser cleaning.
- the cathode tab and the anode tab were welded in the above manner, and the prepared cathode tab and anode tab were fabricated into a lithium ion secondary battery.
- Example 1-2 and Comparative Example 1 100 lithium ion secondary batteries obtained in Example 1-2 and Comparative Example 1 were respectively taken and subjected to full charge disassembly to observe the inner short circuit point and the welding of the tabs.
- Example 1 there is no problem of short circuit inside the cell and weak soldering of the ear (ie, the ear is detached from the current collector); and in the comparative example 1, there is a short circuit inside the cell and a virtual ear The situation of welding.
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- Adhesive Tapes (AREA)
Abstract
本发明提供一种结构胶纸。所述结构胶纸包括:第一胶黏剂层,含有第一胶黏剂且用于粘贴在被粘接对象上;以及磁性材料层,含有磁性材料且设置在第一胶黏剂层远离所述被粘结对象的一侧。当本发明的结构胶纸用于二次电池中时,能在集流体上预留出形成极耳的预留区域,且在该预留区域内的极耳焊接牢固、不易脱落,有效改善二次电池的安全性能。
Description
本发明涉及胶纸技术领域,尤其涉及一种结构胶纸。
目前二次电池制备过程中,常采用激光清洗的方法将阴/阳极片上的活性物质清除,以在集流体上裸露形成用于焊接极耳的预留区域。
但是采用激光对阴/阳极片上的活性物质进行清洗时,存在针孔、毛刺以及活性物质残留的情况,导致二次电池易发生内短路,且还存在极耳脱落引发的断路问题。
发明内容
鉴于背景技术中存在的问题,本发明的目的在于提供一种结构胶纸,当所述结构胶纸用于二次电池中时,能在集流体上预留出形成极耳的预留区域,且在该预留区域内的极耳焊接牢固、不易脱落,有效改善二次电池的安全性能。
为了达到上述目的,在本发明的一方面,本发明提供了一种结构胶纸,其包括:第一胶黏剂层,含有第一胶黏剂且用于粘贴在被粘接对象上;以及磁性材料层,含有磁性材料且设置在第一胶黏剂层远离所述被粘结对象的一侧。
相对于现有技术,本发明的有益效果为:
当本发明的结构胶纸用于二次电池中时,能在集流体上预留出形成极耳的预留区域,且在该预留区域内的极耳焊接牢固、不易脱落,有效改善二次电池的安全性能。
图1为本发明的结构胶纸的一实施例的截面示意图;
图2为本发明的结构胶纸的另一实施例的截面示意图;
图3为本发明的结构胶纸的又一实施例的截面示意图;
图4为本发明的结构胶纸的再一实施例的截面示意图;
图5为图1的一替代实施例的截面示意图;
图6为图2的一替代实施例的截面示意图;
图7为图3的一替代实施例的截面示意图;
图8为图4的一替代实施例的截面示意图;
图9为图3的另一替代实施例的截面示意图;
图10为图4的另一替代实施例的截面示意图;
图11为图3的又一替代实施例的截面示意图;
图12为图4的又一替代实施例的截面示意图;
图13为极片的剖视图,其中粘贴在集流体上的结构胶纸未被剥离;
图14为极片的剖视图,其中粘贴在集流体上的结构胶纸已被剥离且焊接上极耳;
图15为图14的从垂直于纸面的上方看到的一视图。
其中,附图标记说明如下:
1 第一胶黏剂层
11 热熔型胶黏剂
12 发泡剂颗粒
2 磁性材料层
21 磁性材料
22 第三胶黏剂
3 第二胶黏剂层
4 第一基材
5 第二基材
6 极耳
7 极片
71 集流体
72 活性物质层
G 极耳收容凹槽
R 配对凹部
下面详细说明根据本发明的结构胶纸。
首先说明根据本发明第一方面的结构胶纸。
参照图1至图12,根据本发明第一方面的结构胶纸包括:第一胶黏剂层1,含有第一胶黏剂且用于粘贴在被粘接对象上;以及磁性材料层2,含有磁性材料21且设置在第一胶黏剂层1远离所述被粘结对象的一侧。
在根据本发明第一方面所述的结构胶纸中,第一胶黏剂层1的厚度为5μm~60μm。
在根据本发明第一方面所述的结构胶纸中,磁性材料层2的厚度为5μm~60μm。
在根据本发明第一方面所述的结构胶纸中,参照图1、图3、图5、图7、图9、图11,第一胶黏剂层1中的第一胶黏剂选自热熔型胶黏剂11。热熔型胶黏剂是指室温下呈固态,加热熔融呈液态,涂布、润湿被粘结对象后,经压合、冷却,完成粘接的胶黏剂。所述热熔型胶黏剂可以反复融化粘结,其在高温下粘性降低甚至失去粘性。因此,在室温下正常使用时,热熔型胶黏剂11可实现将该结构胶纸粘贴到被粘接对象(诸如集流体)上,待需要将该结构胶纸从被粘接对象剥离时,可通过施加一定温度(诸如50℃~150℃)使热熔型胶黏剂11发生熔融流动进而粘性降低甚至失去粘性并收缩,再借助外界磁源对磁性材料层2中的磁性材料21之间的磁性作用使得该结构胶纸从被粘接对象剥离。
在根据本发明第一方面所述的结构胶纸中,热熔型胶黏剂11选自聚烯类热熔胶、聚氨酯类热熔胶、乙烯及其共聚物类热熔胶、聚酯类热熔胶、聚酰胺类热熔胶、苯乙烯及其嵌段共聚物类热熔胶中的一种或几种。具体地,所述乙烯及其共聚物类热熔胶选自乙烯-醋酸乙烯共聚物(EVA)、乙烯-丙烯酸乙酯共聚物(EEA)、乙烯-丙烯酸共聚物(EAA)、乙烯-醋酸乙烯-乙烯醇三元共聚物(EVAL)中的一种或几种。所述聚烯类热熔胶选自聚乙烯、聚丙烯中的一种或几种。所述苯乙烯及其嵌段共聚物类热熔胶选自苯乙烯-
丁二烯-苯乙烯嵌段共聚物(SBS)、苯乙烯-异戊二烯-苯乙烯嵌段共聚物(SIS)中的一种或几种。
在根据本发明第一方面所述的结构胶纸中,参照图2、图4、图6、图8、图10、图12,第一胶黏剂层1中还包括发泡剂颗粒12,发泡剂颗粒12分布于第一胶黏剂(未示出)。通过发泡剂颗粒12的发泡使得第一胶黏剂层1与被粘接对象失粘,达到剥离的目的。第一胶黏剂可选自丙烯酸树脂类胶黏剂、氟树脂类胶黏剂、通用型双组份聚氨酯胶黏剂、橡胶类胶黏剂、热固性树脂类胶黏剂中的一种或几种。
在根据本发明第一方面所述的结构胶纸中,发泡剂颗粒12选自物理发泡剂和/或化学发泡剂。所述物理发泡剂选自异戊烷发泡剂、异丁烷发泡剂、环戊烷发泡剂中的一种或几种。所述化学发泡剂选自偶氮二甲酰胺、偶氮二异丁腈、N,N-二亚硝基五次甲基四胺、4,4′-氧代双苯磺酰肼、对甲苯磺酰肼中的一种或几种。
在根据本发明第一方面所述的结构胶纸中,发泡剂颗粒12的粒径为5μm~30μm。
在根据本发明第一方面所述的结构胶纸中,参照图1至图12,磁性材料21选自永磁材料、软磁材料中的一种或几种。具体地,磁性材料21选自纯铁、铁硅系合金、铁铝系合金、铁硅铝系合金、镍铁系合金、铁钴系合金、软磁铁氧体、非晶态软磁合金、超微晶软磁合金、钕铁硼稀土合金、铁氧体永磁材料、铝镍钴系永磁合金、铁铬钴系永磁合金中的一种或几种。
在根据本发明第一方面所述的结构胶纸中,在一实施例中,参照图1和图2,磁性材料层2可为片状结构,且磁性材料层2仅含有磁性材料21。即磁性材料层2为仅由磁性材料21制成的片状结构。优选地,磁性材料层2为由磁性材料21制成的箔材形式。
在根据本发明第一方面所述的结构胶纸中,参照图1和图2,磁性材料层2直接设置于第一胶黏剂层1远离所述被粘结对象的一侧。
在根据本发明第一方面所述的结构胶纸中,在另一实施例中,参照图3和图4,磁性材料层2还含有第三胶黏剂22,且磁性材料21分布于第三胶黏剂22中,磁性材料层2远离所述被粘结对象的一侧设置有第一基材4。磁性材料21的结构选自薄片结构、颗粒状结构、丝条状结构、网状结构中的
一种或几种。磁性材料21的含量为磁性材料层2的总质量的30%~75%。
在根据本发明第一方面所述的结构胶纸中,第三胶黏剂22选自橡胶类胶黏剂、通用型双组份聚氨酯胶黏剂、丙烯酸树脂类胶黏剂、氟树脂类胶黏剂、热固性树脂类胶黏剂中的一种或几种。
在根据本发明第一方面所述的结构胶纸中,第一基材4选自聚对苯二甲酸乙二醇酯。
在根据本发明第一方面所述的结构胶纸中,第一基材4的厚度为5μm~30μm。
在根据本发明第一方面所述的结构胶纸中,在一替代实施例中,所述结构胶纸还包括:第二胶黏剂层3,第二胶黏剂层3包括第二胶黏剂但不包含发泡剂颗粒。参照图5,第二胶黏剂层3设置于热熔型胶黏剂11形成的第一胶黏剂层1和仅含有磁性材料21的磁性材料层2之间。参照图6,第二胶黏剂层3设置于包含发泡剂颗粒12的第一胶黏剂层1和仅含有磁性材料21的磁性材料层2之间。参照图7,第二胶黏剂层3设置于热熔型胶黏剂11形成的第一胶黏剂层1和含有第三胶黏剂22的磁性材料层2之间。参照图8,第二胶黏剂层3设置于包含发泡剂颗粒12的第一胶黏剂层1和含有第三胶黏剂22的磁性材料层2之间。这样可以进一步保证第一胶黏剂层1与磁性材料层2之间的粘结效果,避免第一胶黏剂层1与磁性材料层2之间出现意外失粘。
在根据本发明第一方面所述的结构胶纸中,第二胶黏剂层3中的第二胶黏剂选自选自丙烯酸树脂类胶黏剂、氟树脂类胶黏剂、通用型双组份聚氨酯胶黏剂、橡胶类胶黏剂、热固性树脂类胶黏剂中的一种或几种。
在根据本发明第一方面所述的结构胶纸中,第二胶黏剂层3的厚度为5μm~60μm。
在根据本发明第一方面所述的结构胶纸中,在另一替代实施例中,所述结构胶纸还包括:第二基材5。参照图9,第二基材5设置于热熔型胶黏剂11形成的第一胶黏剂层1与含有第三胶黏剂22的磁性材料层2之间。参照图10,第二基材5设置于包含发泡剂颗粒12的第一胶黏剂层1与含有第三胶黏剂22的磁性材料层2之间。参照图11和图12,第二基材5设置于第二胶黏剂层3与含有第三胶黏剂22的磁性材料层2之间。
在根据本发明第一方面所述的结构胶纸中,第二基材5选自聚对苯二甲酸乙二醇酯。
在根据本发明第一方面所述的结构胶纸中,第二基材5的厚度为5μm~30μm。
在根据本发明第一方面所述的结构胶纸中,第一胶黏剂层1中还可包括固化剂。
在根据本发明第一方面所述的结构胶纸中,第二胶黏剂层3中还可包括固化剂。
在根据本发明第一方面所述的结构胶纸中,所述固化剂选自脂肪族多胺、脂环族多胺、聚酰胺、改性芳胺、异氰酸酯中的一种或几种。
在根据本发明第一方面所述的结构胶纸中,参照图13至图15,结构胶纸粘贴在极片7上。极片7包括集流体71以及活性物质层72。具体地,结构胶纸粘贴在集流体71上,即被粘接对象为集流体71。在集流体71的一个表面上涂布活性物质层72之前,将结构胶纸的第一胶黏剂层1粘贴于集流体71的形成极耳6的极耳收容凹槽G处,当在集流体71的该一个表面上涂布活性物质层72之后对活性物质层72的进行烘干,烘干完成后,剥离结构胶纸,形成极耳6的极耳收容凹槽G。
在根据本发明第一方面所述的结构胶纸中,参照图13至图15,在集流体71的另一表面上涂布活性物质层72之前,还将结构胶纸的第一胶黏剂层1粘贴于集流体71的与形成极耳6的极耳收容凹槽G正背对的配对凹部R处,当在集流体71的该另一表面上涂布活性物质层72之后对活性物质层72进行烘干,烘干完成后,剥离配对凹部R处的结构胶纸,形成与极耳6的极耳收容凹槽G正背对的配对凹部R。配对凹部R的设置,便于极耳6超声焊接于极耳收容凹槽G中。
在根据本发明第一方面所述的结构胶纸中,具体地,氟树脂类胶黏剂选自聚四氟乙烯(PTFE)、聚三氟氯乙烯(PCTFE)、乙烯-三氟氯乙烯共聚物(ECTFE)、乙烯-四氟乙烯共聚物(ETFE)、聚偏氟乙烯(PVDF)、聚氯乙烯(PVF)中的一种或几种。橡胶类胶黏剂选自氯丁橡胶、丁腈橡胶、丁苯橡胶、丁基橡胶、氟橡胶、有机硅橡胶中的一种或几种。热固性树脂类胶黏剂选自酚醛树脂、脲醛树脂、环氧树脂、氨基树脂中的一种或几种。
下面结合实施例,进一步阐述本申请。应理解,这些实施例仅用于说明本申请而不用于限制本申请的范围。
实施例1
室温环境下,将颗粒状的磁性材料纯铁以及镍铁系合金的混合物加入熔融的聚偏氟乙烯中,在40rpm~60rpm的转速下搅拌均匀,采用刮刀涂布在第一基材PET(厚度为19μm)上形成磁性材料层,控制涂布厚度为30μm,磁性材料层中颗粒状的磁性材料的含量为50%。
室温环境下,将发泡剂环戊烷(发泡温度为120℃~130℃)与丙烯酸酯树脂类胶黏剂以及乙酸乙酯在40rpm~60rpm的转速下搅拌制成第一胶黏剂层的浆料,搅拌时间为30min。将第一胶黏剂层的浆料涂布在上述磁性材料层上,控制涂布厚度为50μm,加热烘干以除去溶剂,得到第一胶黏剂层。
加热至45℃使第一胶黏剂层熟化,熟化时间为60h,完成结构胶纸的制备。
参考图13,将结构胶纸粘贴到集流体71的预设位置,随后进行活性物质层72的涂布,完成涂布后,将极片7送入烘箱进行干燥(烘箱温度80℃~150℃),结构胶纸中的发泡剂环戊烷因受热而发泡,使第一胶黏剂层与集流体72之间分离而失去粘接,在活性物质层72流经烘箱还处于湿润状态时施加外界磁源对结构胶纸中的磁性材料层进行吸附,使结构胶纸连同其上的活性物质层72一起去除,从而裸露出极耳收容凹槽G,以供极耳6进行焊接。
通过上述方式进行阴极极耳和阳极极耳的焊接,将制备的阴极极片和阳极极片制作成锂离子二次电池。
实施例2
室温环境下,将颗粒状的磁性材料纯铁以及镍铁系合金的混合物加入熔融的聚偏氟乙烯中,在40rpm~60rpm的转速下搅拌均匀,采用刮刀涂布在第一基材PET(厚度为19μm)上形成磁性材料层,控制涂布厚度为30μm,磁性材料层中颗粒状的磁性材料的含量为50%。
室温环境下,将EVA热熔胶以及甲苯在40rpm~60rpm的转速下搅拌制成第一胶黏剂层的浆料,搅拌时间为30min。将第一胶黏剂层的浆料涂布在上述磁性材料层上,控制涂布厚度为50μm,加热烘干以除去溶剂,得到第一胶黏剂层。
加热至45℃使第一胶黏剂层熟化,熟化时间为60h,完成结构胶纸的制备。
参考图13,将结构胶纸粘贴到集流体71的预设位置,随后进行活性物质层72的涂布,完成涂布后,将极片7送入烘箱进行干燥(烘箱温度80℃~150℃),结构胶纸中的EVA热熔胶发生熔融流动进而粘性降低并收缩,使第一胶黏剂层与集流体72之间分离而失去粘接,在活性物质层72流经烘箱还处于湿润状态时施加外界磁源对结构胶纸中的磁性材料层进行吸附,使结构胶纸连同其上的活性物质层72一起去除,从而裸露出极耳收容凹槽G,以供极耳6进行焊接。
通过上述方式进行阴极极耳和阳极极耳的焊接,将制备的阴极极片和阳极极片制作成锂离子二次电池。
对比例1
采用激光清洗的方式在极片上清洗出极耳收容凹槽。
通过上述方式进行阴极极耳和阳极极耳的焊接,将制备的阴极极片和阳极极片制作成锂离子二次电池。
分别取100支实施例1-2和对比例1所得的锂离子二次电池,进行满充拆解观察内短路点及极耳的焊接情况。
表1 实施例1-2和对比例1的测试结果
| 内短路比例 | 阳极极耳虚焊比例 | 阴极极耳虚焊比例 | |
| 实施例1 | 0% | 0% | 0% |
| 实施例2 | 0% | 0% | 0% |
| 对比例1 | 17% | 2% | 23% |
由表1中统计可知,实施例1和实施例2没有出现电芯内短路及极耳虚焊(即极耳从集流体脱落)问题;而对比例1中存在电芯内短路以及极耳虚焊的情况。
Claims (46)
- 一种结构胶纸,其特征在于,包括:第一胶黏剂层(1),含有第一胶黏剂且用于粘贴在被粘接对象上;以及磁性材料层(2),含有磁性材料(21)且设置在第一胶黏剂层(1)远离所述被粘结对象的一侧。
- 根据权利要求1所述的结构胶纸,其特征在于,第一胶黏剂选自热熔型胶黏剂(11)。
- 根据权利要求2所述的结构胶纸,其特征在于,热熔型胶黏剂(11)选自聚烯类热熔胶、聚氨酯类热熔胶、乙烯及其共聚物类热熔胶、聚酯类热熔胶、聚酰胺类热熔胶、苯乙烯及其嵌段共聚物类热熔胶中的一种或几种。
- 根据权利要求3所述的结构胶纸,其特征在于,所述乙烯及其共聚物类热熔胶选自乙烯-醋酸乙烯共聚物、乙烯-丙烯酸乙酯共聚物、乙烯-丙烯酸共聚物、乙烯-醋酸乙烯-乙烯醇三元共聚物中的一种或几种。
- 根据权利要求3所述的结构胶纸,其特征在于,所述聚烯类热熔胶选自聚乙烯、聚丙烯中的一种或几种。
- 根据权利要求3所述的结构胶纸,其特征在于,所述苯乙烯及其嵌段共聚物类热熔胶选自苯乙烯-丁二烯-苯乙烯嵌段共聚物、苯乙烯-异戊二烯-苯乙烯嵌段共聚物中的一种或几种。
- 根据权利要求1所述的结构胶纸,其特征在于,第一胶黏剂层(1)中还包括发泡剂颗粒(12),发泡剂颗粒(12)分布于第一胶黏剂。
- 根据权利要求7所述的结构胶纸,其特征在于,第一胶黏剂选自丙烯酸树脂类胶黏剂、氟树脂类胶黏剂、通用型双组份聚氨酯胶黏剂、橡胶类胶黏剂、热固性树脂类胶黏剂中的一种或几种。
- 根据权利要求1所述的结构胶纸,其特征在于,磁性材料(21)选自永磁材料、软磁材料中的一种或几种。
- 根据权利要求9所述的结构胶纸,其特征在于,磁性材料(21)选自纯铁、铁硅系合金、铁铝系合金、铁硅铝系合金、镍铁系合金、铁钴系合金、软磁铁氧体、非晶态软磁合金、超微晶软磁合金、钕铁硼稀土合金、铁氧体永磁材料、铝镍钴系永磁合金、铁铬钴系永磁合金中的一种或几种。
- 根据权利要求2或7所述的结构胶纸,其特征在于,磁性材料层(2)为片状结构,且磁性材料层(2)仅含有磁性材料(21)。
- 根据权利要求11所述的结构胶纸,其特征在于,磁性材料层(2)直接设置于第一胶黏剂层(1)远离所述被粘结对象的一侧。
- 根据权利要求2或7所述的结构胶纸,其特征在于,磁性材料层(2)还含有第三胶黏剂(22),且磁性材料(21)分布于第三胶黏剂(22)中,磁性材料层(2)远离所述被粘结对象的一侧设置有第一基材(4)。
- 根据权利要求13所述的结构胶纸,其特征在于,磁性材料(21)的结构选自薄片结构、颗粒状结构、丝条状结构、网状结构中的一种或几种。
- 根据权利要求11所述的结构胶纸,其特征在于,所述结构胶纸还包括:第二胶黏剂层(3),设置于第一胶黏剂层(1)和磁性材料层(2)之间,包括第二胶黏剂但不包含发泡剂颗粒。
- 根据权利要求13所述的结构胶纸,其特征在于,所述结构胶纸还包 括:第二胶黏剂层(3),设置于第一胶黏剂层(1)和磁性材料层(2)之间,包括第二胶黏剂但不包含发泡剂颗粒。
- 根据权利要求13所述的结构胶纸,其特征在于,所述结构胶纸还包括:第二基材(5),设置于第一胶黏剂层(1)与磁性材料层(2)之间。
- 根据权利要求16所述的结构胶纸,其特征在于,所述结构胶纸还包括:第二基材(5),设置于第二胶黏剂层(3)与磁性材料层(2)之间。
- 根据权利要求13所述的结构胶纸,其特征在于,磁性材料(21)的含量为磁性材料层(2)的总质量的30%~75%。
- 根据权利要求1所述的结构胶纸,其特征在于,磁性材料层(2)的厚度为5μm~60μm。
- 根据权利要求13所述的结构胶纸,其特征在于,第三胶黏剂(22)选自橡胶类胶黏剂、通用型双组份聚氨酯胶黏剂、丙烯酸树脂类胶黏剂、氟树脂类胶黏剂、热固性树脂类胶黏剂中的一种或几种。
- 根据权利要求13所述的结构胶纸,其特征在于,第一基材(4)选自聚对苯二甲酸乙二醇酯。
- 根据权利要求13所述的结构胶纸,其特征在于,第一基材(4)的厚度为5μm~30μm。
- 根据权利要求17所述的结构胶纸,其特征在于,第二基材(5)选自聚对苯二甲酸乙二醇酯。
- 根据权利要求17所述的结构胶纸,其特征在于,第二基材(5)的厚度为5μm~30μm。
- 根据权利要求18所述的结构胶纸,其特征在于,第二基材(5)选自聚对苯二甲酸乙二醇酯。
- 根据权利要求18所述的结构胶纸,其特征在于,第二基材(5)的厚度为5μm~30μm。
- 根据权利要求15所述的结构胶纸,其特征在于,第二胶黏剂选自丙烯酸树脂类胶黏剂、氟树脂类胶黏剂、通用型双组份聚氨酯胶黏剂、橡胶类胶黏剂、热固性树脂类胶黏剂中的一种或几种。
- 根据权利要求15所述的结构胶纸,其特征在于,第二胶黏剂层(3)的厚度为5μm~60μm。
- 根据权利要求16所述的结构胶纸,其特征在于,第二胶黏剂选自丙烯酸树脂类胶黏剂、氟树脂类胶黏剂、通用型双组份聚氨酯胶黏剂、橡胶类胶黏剂、热固性树脂类胶黏剂中的一种或几种。
- 根据权利要求16所述的结构胶纸,其特征在于,第二胶黏剂层(3)的厚度为5μm~60μm。
- 根据权利要求7所述的结构胶纸,其特征在于,发泡剂颗粒(12)选自物理发泡剂和/或化学发泡剂。
- 根据权利要求32所述的结构胶纸,其特征在于,所述物理发泡剂选自异戊烷发泡剂、异丁烷发泡剂、环戊烷发泡剂中的一种或几种;所述化学发泡剂选自偶氮二甲酰胺、偶氮二异丁腈、N,N-二亚硝基五次甲基四胺、4,4′-氧代双苯磺酰肼、对甲苯磺酰肼中的一种或几种。
- 根据权利要求7所述的结构胶纸,其特征在于,发泡剂颗粒(12)的粒径为5μm~30μm。
- 根据权利要求1所述的结构胶纸,其特征在于,第一胶黏剂层(1)中还包括固化剂。
- 根据权利要求1所述的结构胶纸,其特征在于,所述固化剂选自脂肪族多胺、脂环族多胺、聚酰胺、改性芳胺、异氰酸酯中的一种或几种。
- 根据权利要求15所述的结构胶纸,其特征在于,第二胶黏剂层(3)中还包括固化剂。
- 根据权利要求37所述的结构胶纸,其特征在于,所述固化剂选自脂肪族多胺、脂环族多胺、聚酰胺、改性芳胺、异氰酸酯中的一种或几种。
- 根据权利要求16所述的结构胶纸,其特征在于,第二胶黏剂层(3)中还包括固化剂。
- 根据权利要求39所述的结构胶纸,其特征在于,所述固化剂选自脂肪族多胺、脂环族多胺、聚酰胺、改性芳胺、异氰酸酯中的一种或几种。
- 根据权利要求1所述的结构胶纸,其特征在于,第一胶黏剂层(1)的厚度为5μm~60μm。
- 根据权利要求1所述的结构胶纸,其特征在于,被粘接对象为集流体(71),在集流体(71)的一个表面上涂布活性物质层(72)之前,将结构胶纸的第一胶黏剂层(1)粘贴于集流体(71)上的形成极耳(6)的极耳收容凹槽(G)处,当在集流体(71)的该一个表面上涂布活性物质层(72)之后对活性物质层(72)的进行烘干,烘干完成后,剥离结构胶纸,形成极耳(6)的极耳收容凹槽(G)。
- 根据权利要求42所述的结构胶纸,其特征在于,在集流体(71)的另一表面上涂布活性物质层(72)之前,还将结构胶纸的第一胶黏剂层(1)粘贴于集流体(71)的与形成极耳(6)的极耳收容凹槽(G)正背对的配对凹部(R)处,当在集流体(71)的该另一表面上涂布活性物质层(72)之后对活性物质层(72)进行烘干,烘干完成后,剥离配对凹部(R)处的结构胶纸,形成与极耳(6)的极耳收容凹槽(G)正背对的配对凹部(R)。
- 根据权利要求8、21、28或30所述的结构胶纸,其特征在于,氟树脂类胶黏剂选自聚四氟乙烯、聚三氟氯乙烯、乙烯-三氟氯乙烯共聚物、乙烯-四氟乙烯共聚物、聚偏氟乙烯、聚氯乙烯中的一种或几种。
- 根据权利要求8、21、28或30所述的结构胶纸,其特征在于,橡胶类胶黏剂选自氯丁橡胶、丁腈橡胶、丁苯橡胶、丁基橡胶、氟橡胶、有机硅橡胶中的一种或几种。
- 根据权利要求8、21、28或30所述的结构胶纸,其特征在于,热固性树脂类胶黏剂选自酚醛树脂、脲醛树脂、环氧树脂、氨基树脂中的一种或几种。
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| CN109705760A (zh) * | 2018-12-27 | 2019-05-03 | 东莞市澳中电子材料有限公司 | 一种锂电池用环保耐高温终止胶带及其制备方法 |
| CN110328121A (zh) * | 2019-06-11 | 2019-10-15 | 惠州锂威新能源科技有限公司 | 一种极片涂层去除系统及其垫片和使用方法 |
| CN113441714A (zh) * | 2021-06-24 | 2021-09-28 | 安徽瑞德磁电科技有限公司 | 一种用于提升气雾化铁硅铝软磁复合材料强度的方法 |
| CN113782701A (zh) * | 2021-08-05 | 2021-12-10 | 惠州市豪鹏科技有限公司 | 一种锂离子电池极片的制备方法 |
| CN114597602A (zh) * | 2020-12-04 | 2022-06-07 | 比亚迪股份有限公司 | 用于软包电池的覆膜极耳及其制备方法 |
| CN114736630A (zh) * | 2021-08-23 | 2022-07-12 | 常州威斯双联科技有限公司 | 一种具有粘结功能的隔磁胶膜及其制备方法和应用 |
| CN117116598A (zh) * | 2023-08-22 | 2023-11-24 | 上海甘戎新材料有限公司 | 具有磁性的复合薄膜和使用该复合薄膜制备导电极片的制备方法 |
| US12286563B2 (en) | 2019-06-18 | 2025-04-29 | Avery Dennison Corporation | Butyl rubber based pressure sensitive adhesives |
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| CN110328121A (zh) * | 2019-06-11 | 2019-10-15 | 惠州锂威新能源科技有限公司 | 一种极片涂层去除系统及其垫片和使用方法 |
| US12286563B2 (en) | 2019-06-18 | 2025-04-29 | Avery Dennison Corporation | Butyl rubber based pressure sensitive adhesives |
| CN114597602A (zh) * | 2020-12-04 | 2022-06-07 | 比亚迪股份有限公司 | 用于软包电池的覆膜极耳及其制备方法 |
| CN113441714A (zh) * | 2021-06-24 | 2021-09-28 | 安徽瑞德磁电科技有限公司 | 一种用于提升气雾化铁硅铝软磁复合材料强度的方法 |
| CN113441714B (zh) * | 2021-06-24 | 2023-08-08 | 安徽瑞德磁电科技有限公司 | 一种用于提升气雾化铁硅铝软磁复合材料强度的方法 |
| CN113782701A (zh) * | 2021-08-05 | 2021-12-10 | 惠州市豪鹏科技有限公司 | 一种锂离子电池极片的制备方法 |
| CN114736630A (zh) * | 2021-08-23 | 2022-07-12 | 常州威斯双联科技有限公司 | 一种具有粘结功能的隔磁胶膜及其制备方法和应用 |
| CN117116598A (zh) * | 2023-08-22 | 2023-11-24 | 上海甘戎新材料有限公司 | 具有磁性的复合薄膜和使用该复合薄膜制备导电极片的制备方法 |
| CN117116598B (zh) * | 2023-08-22 | 2024-10-11 | 上海甘戎新材料有限公司 | 具有磁性的复合薄膜和使用该复合薄膜制备导电极片的制备方法 |
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