CN217499128U - Double-sided adhesive tape and lithium ion battery - Google Patents
Double-sided adhesive tape and lithium ion battery Download PDFInfo
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- CN217499128U CN217499128U CN202122317903.0U CN202122317903U CN217499128U CN 217499128 U CN217499128 U CN 217499128U CN 202122317903 U CN202122317903 U CN 202122317903U CN 217499128 U CN217499128 U CN 217499128U
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- lithium ion
- ion battery
- adhesive
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 46
- 239000002390 adhesive tape Substances 0.000 title claims abstract description 34
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 239000010410 layer Substances 0.000 claims description 102
- 239000012790 adhesive layer Substances 0.000 claims description 63
- 239000000853 adhesive Substances 0.000 claims description 51
- 230000001070 adhesive effect Effects 0.000 claims description 51
- 239000000463 material Substances 0.000 claims description 11
- 239000005060 rubber Substances 0.000 claims description 8
- 229920001971 elastomer Polymers 0.000 claims description 7
- 239000004814 polyurethane Substances 0.000 claims description 7
- 229920002635 polyurethane Polymers 0.000 claims description 7
- 239000000123 paper Substances 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229920006332 epoxy adhesive Polymers 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 239000011086 glassine Substances 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- -1 polyacrylic Polymers 0.000 claims 1
- 230000004888 barrier function Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 14
- 230000009471 action Effects 0.000 description 13
- 239000003792 electrolyte Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 9
- 239000012528 membrane Substances 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000007731 hot pressing Methods 0.000 description 4
- 239000012943 hotmelt Substances 0.000 description 4
- 239000007779 soft material Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 229920002125 Sokalan® Polymers 0.000 description 3
- 239000004831 Hot glue Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000004584 polyacrylic acid Substances 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000016 photochemical curing Methods 0.000 description 1
- 229920005559 polyacrylic rubber Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 229920006124 polyolefin elastomer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000013464 silicone adhesive Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
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- Adhesive Tapes (AREA)
Abstract
The utility model provides a double-sided tape and lithium ion battery. The utility model discloses a first aspect provides a lithium ion battery, which comprises a positive plate, a diaphragm and a negative plate, wherein the negative plate comprises a negative current collector and a negative active layer arranged on at least one surface of the negative current collector, and the surface of the negative current collector is provided with a negative lug; the diaphragm surface paste has double-sided tape, double-sided tape is including the first tie coat, substrate layer and the second tie coat that stack gradually, just the cohesive strength of first tie coat is greater than the cohesive strength of second tie coat. The utility model provides a double faced adhesive tape can be used to pasting of diaphragm among the lithium ion battery, has effectively solved the technical difficulty that can't set up lithium ion barrier layer on the diaphragm.
Description
Technical Field
The utility model relates to a double-sided tape and lithium ion battery relates to lithium ion battery technical field.
Background
The adhesive tape has the characteristics of light weight, environmental protection, excellent bonding performance and the like, and is widely applied to various scenes of life and industrial production, such as sealing, fixing, repairing, warning and the like. However, the adhesive tape has more inconvenience and limitation on certain materials, for example, for light and soft polymer films, metal foils, gauzes and the like, the materials are soft, and the adhesive tape has the problems of inaccurate adhesive positioning, wrinkling, deflection, bubble generation and the like due to the external force of the adhesive tape. Therefore, how to develop an adhesive tape suitable for a light and soft material becomes a technical problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model provides a double-sided tape, which is suitable for bonding light soft materials.
The utility model also provides a lithium ion battery, it includes the diaphragm to diaphragm surface paste has above-mentioned double-sided tape, can effectively solve the technical difficulty that can't set up lithium ion barrier layer on the diaphragm.
The utility model provides a double-sided adhesive tape, which comprises a first bonding layer, a substrate layer and a second bonding layer which are sequentially stacked;
the first bonding layer comprises one of organic silicon adhesives, epoxy adhesives, polyurethane adhesives, polyacrylic adhesives and rubber adhesives, and the bonding strength of the first bonding layer is greater than that of the second bonding layer.
In the double-sided tape, the second adhesive layer may include one of silicone adhesives, epoxy adhesives, polyurethane adhesives, polyacrylic adhesives, and rubber adhesives.
The thickness of the first bonding layer is 1-20 μm.
The thickness of the second adhesive layer is 1-20 μm.
As for the double-sided adhesive tape, the base material layer comprises one of PI, PP, PE and PET.
The thickness of the substrate layer is 3-50 μm.
Like above-mentioned double-sided tape, double-sided tape still includes from the type layer, it is in to set up from the type layer the surface of substrate layer is kept away from to first tie coat, it is PE from type membrane, PET from type membrane, OPP from type membrane, compound from type membrane, glassine from type paper, CCK from one of type paper from the type layer.
The thickness of the release layer is 3-100 μm.
The utility model provides a lithium ion battery in a second aspect, which comprises a positive plate, a diaphragm and a negative plate, wherein the negative plate comprises a negative current collector and a negative active layer arranged on at least one surface of the negative current collector, and the surface of the negative current collector is provided with a negative lug;
any one of the double-sided adhesive tapes is adhered to the surface of the diaphragm, and the vertical projection area of the negative electrode tab on the diaphragm falls into the vertical projection area of the double-sided adhesive tape on the diaphragm.
In the above lithium ion battery, the first adhesive layer of the double-sided tape comprises a hot-melt type electrolyte-resistant adhesive, and the second adhesive layer comprises a pressure-sensitive type electrolyte-resistant adhesive.
The utility model discloses an implement, have following advantage at least:
1. the utility model provides a double-sided tape, it includes two-layer tie coat to the bonding strength of first tie coat is greater than the bonding strength of second tie coat, and the accessible shifts the mode of the supplementary rubberizing of object, can be effective, accurate paste double-sided tape on the soft class material surface of light, effectively solve the rubberizing and crumple, the location is bad, bubble scheduling problem appears.
2. The utility model provides a double faced adhesive tape can be arranged in pasting of lithium ion battery diaphragm, has effectively solved the technical difficulty that can't set up lithium ion barrier layer on the diaphragm.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural view of a double-sided tape according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating the use of a double-sided adhesive tape according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a double-sided adhesive tape according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a lithium ion battery according to an embodiment of the present invention;
fig. 5 is a schematic view illustrating the use of a double-sided tape in a lithium ion battery according to an embodiment of the present invention.
Description of reference numerals:
1: double-sided adhesive tape;
1-1: a first adhesive layer;
1-2: a substrate layer;
1-3: a second adhesive layer;
1-4: a release layer;
2: transferring the object;
3: an object to be bonded;
101: a positive current collector;
102: a positive electrode active layer;
200: a diaphragm;
301: a negative current collector;
302: a negative electrode active layer;
400: and a negative tab.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to solve the problem of difficulty in surface gluing of light soft materials, the utility model provides a double-sided adhesive tape in a first aspect, which comprises a first bonding layer, a substrate layer and a second bonding layer which are sequentially stacked;
the first bonding layer comprises one of organic silicon type, epoxy type, polyurethane type, polyacrylic acid type and rubber type bonding agents, and the bonding strength of the first bonding layer is larger than that of the second bonding layer.
The utility model provides a double-sided tape, it has two-sided tie coat, the tie coat on one of them surface can bond with shifting the object, and bond the tie coat on another surface of double-sided tape to waiting to bond the object surface with the help of shifting the object, wherein, waiting to bond the object and be light soft type material, if there are problems such as rubberizing location is inaccurate, crumple, skew, appear bubble in adopting the mode of direct rubberizing, and shift the object and be non-light soft type material, do not have above-mentioned rubberizing problem, specifically, figure 1 is the structural sketch map of the double-sided tape that the utility model provides for an embodiment, as shown in figure 1, double-sided tape 1 includes the first tie coat 1-1, substrate layer 1-2 and second tie coat 1-3 that laminate sequentially, substrate layer 1-2 is as the base member of double-sided tape 1, is used for loading first tie coat 1-1 and second tie coat 1-3, the second adhesive layer 1-3 is used for bonding with a transferred object, and is arranged on one surface of the substrate layer 1-2, the first adhesive layer 1-1 is used for bonding with an object to be bonded, and is arranged on the other surface of the substrate layer 1-2, the first adhesive layer 1-1 and the second adhesive layer 1-3 both comprise adhesives, the difference is that the bonding strength of the first adhesive layer 1-1 is greater than that of the second adhesive layer 1-3, the first adhesive layer comprises one of organic silicon adhesives, epoxy adhesives, polyurethane adhesives, polyacrylic acids and rubber adhesives, and technicians in the field can reasonably select the type of the adhesive and ensure that the bonding strength of the first adhesive layer is greater than that of the second adhesive layer; in the above five kinds of adhesives, some adhesives need to release the viscosity under the action of external force, such as pressure-sensitive adhesives, hot-melt adhesives, etc., therefore, the present invention defines that the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer, which means that the adhesive strength of the first adhesive layer and that of the second adhesive layer are in the final state, i.e., after the bonding process is completed, for example, for some adhesives that can have viscosity without the action of external force, the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer; or before the external force acts, the bonding strength of the first bonding layer is smaller than that of the second bonding layer, and the viscosity of the bonding agent in the first bonding layer is released under the action of the external force, so that the bonding strength of the first bonding layer is larger than that of the second bonding layer; or the adhesive in the first adhesive layer does not need external force to release viscosity, before the external force acts, the adhesive strength of the adhesive in the second adhesive layer is greater than that of the first adhesive layer, and under the action of the external force, the viscosity of the adhesive in the second adhesive layer is reduced or even lost, so that the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer, and the specific implementation mode can be determined according to the properties of the adhesives used in the first adhesive layer and the second adhesive layer; the utility model provides a double-sided tape is in the use, paste second tie coat and transfer object, with first tie coat paste on being pasted the object surface under the supplementary of transfer object, for example, fig. 2 is the double-sided tape's that an embodiment provided uses the method schematic diagram, as shown in fig. 2, at first, paste second tie coat 1-3 on transfer object 2 surface, will treat later that bonding object 3 adheres to first tie coat 1-1 surface, because the bonding strength of first tie coat 1-1 is greater than the bonding strength of second tie coat 1-3, make first tie coat 1-1 more firm with the bonding of treating bonding object 3, technical staff in the art can combine actual need to remain or peel off second tie coat 1-3, accomplish the bonding demand of treating bonding object surface. The utility model provides a double-sided tape, it includes two-layer tie coat to the cohesive strength of first tie coat is greater than the cohesive strength of second tie coat, and the accessible shifts the mode of the supplementary rubberizing of object, can be effective, accurate paste the tape on soft object surface, effectively solve the gentle soft class material rubberizing of light and crumple, the location is bad, the bubble scheduling problem appears.
The second adhesive layer is made of one of silicone, epoxy, polyurethane, polyacrylic and rubber adhesives, and the type of the adhesive in the first adhesive layer and the type of the adhesive in the second adhesive layer can be selected by those skilled in the art according to conventional technical means, so that the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer.
In a specific embodiment, the first bonding layer comprises a first pressure-sensitive adhesive, the second bonding layer comprises a second pressure-sensitive adhesive, the first pressure-sensitive adhesive and the second pressure-sensitive adhesive release viscosity under the action of pressure, and after the action of pressure, the bonding strength of the first bonding layer is greater than that of the second bonding layer, in the using process, the second bonding layer is pasted on the surface of a transfer object, the pasting purpose is achieved under the action of pressure, the first bonding layer is pasted on the surface of the object to be pasted, under the action of pressure, the double-sided adhesive tape is pasted on the surface of the object to be pasted, and the adhesion of the double-sided adhesive tape and the object to be pasted is completed.
In another specific embodiment, the first adhesive layer comprises a first pressure-sensitive adhesive, and is solvent-resistant, the second adhesive layer comprises a second pressure-sensitive adhesive, and is solvent-resistant, in the use process, the second adhesive layer is pasted on the surface of the transfer object, and the pasting purpose is achieved under the action of pressure, then the first adhesive layer is pasted on the surface of the object to be pasted under the action of pressure, then the double-sided tape together with the object to be pasted and the transfer object are placed in the solvent, under the soaking of the solvent, the bonding strength of the second adhesive layer is reduced or even lost, the bonding strength of the first adhesive layer is greater than that of the second adhesive layer, and the bonding of the double-sided tape and the object to be pasted is completed.
In a further embodiment, the first adhesive layer comprises a hot-melt adhesive and the second adhesive layer comprises a pressure-sensitive adhesive, the second adhesive layer is adhered to the surface of the transferred object in use and is adhered under pressure, the first adhesive layer is adhered to the surface of the object to be adhered, the first adhesive layer has low adhesive strength, and the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer due to the release of the adhesiveness under the action of heat, so that the adhesion of the double-sided adhesive tape to the object to be adhered is completed.
In another embodiment, the first adhesive layer may also be a photo-curing adhesive, a moisture-based adhesive, or the like, and the function is the same as that described above, i.e. the adhesive strength of the first adhesive layer is greater than that of the second adhesive layer under the action of light and moisture, so as to complete the adhesion of the double-sided adhesive tape to the object to be adhered.
The skilled person can select a suitable kind of adhesive and apply the adhesive on the surface of the substrate layer to obtain the adhesive layer, and the substrate layer can comprise materials conventional in the art, and specifically, the substrate layer comprises one of PI, PP, PE and PET.
Further, the thickness of the substrate layer is 3-50 μm.
The adhesive coated on the surface of the substrate layer can be coated with a single layer, a double layer or a plurality of layers, and can be selected by a person skilled in the art according to the actual needs, and the thickness of the first adhesive layer is 1-20 μm.
Like the first adhesive layer, the second adhesive layer may also be a single layer, a double layer or a multiple layer coated with an adhesive, the second adhesive layer having a thickness of 1 to 20 μm.
For the convenience of double-sided tape's use, double-sided tape still includes from the type layer, it is in to set up from the type layer the surface of substrate layer is kept away from to first tie coat, fig. 3 is the utility model discloses a double-sided tape's that still another embodiment provides structural schematic diagram, as shown in fig. 3, the surface of keeping away from substrate layer 1-2 at first tie coat 1-1 is provided with from type layer 1-4, does not possess the adhesion from type layer 1-4, mainly used protection first tie coat 1-1, it is PE from type membrane, PET from type membrane, OPP from type membrane, compound from type membrane, glassine from type paper, CCK from one of type paper to leave the type layer.
In the use process, before the first bonding layer 1-1 is bonded with the surface of the object 3 to be bonded, the release layer 1-4 is peeled off from the surface of the first bonding layer 1-1 and then bonded with the object 3 to be bonded.
Further, the thickness of the release layer is 3-100 μm.
To sum up, the utility model provides a double-sided tape, it includes two-layer tie coat to the adhesive strength of first tie coat is greater than the adhesive strength of second tie coat, and the accessible shifts the mode of the supplementary rubberizing of object, can be effective, accurate paste the sticky tape on the soft class material surface of light, effectively solve the rubberizing and crumple, the location is bad, the bubble scheduling problem appears.
The fast charging is one of the current development directions of the lithium ion battery, wherein, the tab is a metal conductor led out from the lithium ion battery core, the tab is arranged in the middle to realize one of the fast charging modes, in order to reduce the safety risk caused by lithium analysis in the cycle process of the lithium ion battery, a lithium ion barrier layer is usually arranged in the vertical projection area of the negative tab on the diaphragm, namely, an adhesive tape is pasted on the surface of the diaphragm, but because the diaphragm is made of a light soft material, the problems of adhesive tape wrinkling, position offset and even non-equal pasting can be caused when the adhesive tape is directly pasted on the diaphragm, and the double-sided adhesive tape provided by the utility model can effectively solve the problems, therefore, the second aspect of the utility model provides the lithium ion battery, the lithium ion battery comprises a positive plate, the diaphragm and a negative plate, the negative plate comprises a negative current collector and a negative active layer arranged on at least one surface of the negative current collector, the surface of the negative current collector is provided with a negative lug;
the double-sided tape is adhered to the surface of the diaphragm, and the vertical projection area of the cathode lug on the diaphragm falls in the vertical projection area of the double-sided tape on the diaphragm.
The utility model provides a lithium ion battery, which comprises a positive plate, a negative plate, a diaphragm arranged between the negative plate and the positive plate, and a negative plate, wherein the two-sided adhesive tape is pasted in the vertical projection area of the negative plate on the diaphragm, concretely, figure 4 is a lithium ion battery structure schematic diagram provided by the utility model, as shown in figure 4, the lithium ion battery comprises the positive plate, the diaphragm 200 and the negative plate, the positive plate comprises a positive current collector 101 and a positive active layer 102 arranged on the surface of the positive current collector, the negative plate comprises a negative current collector 301 and a negative active layer 302 arranged on the surface of the negative current collector, the negative plate 301 middle area is provided with a negative plate 400, namely, the left side and the right side of the negative plate 400 are both provided with the negative active layers 302, the diaphragm 200 is arranged between the positive plate and the negative plate for isolating the contact of the positive plate and the negative plate, the double-sided tape 1 is adhered to the surface of the diaphragm 200, the vertical projection area of the negative electrode tab 400 on the diaphragm 200 falls into the vertical projection area of the double-sided tape 1 on the diaphragm 200, and the double-sided tape 1 can be used as a lithium ion barrier layer to prevent potential safety hazards caused by lithium precipitation of a negative electrode sheet; when the separator 200 is an object to be bonded, a positive plate can be used as a transfer object, for example, fig. 5 is a schematic diagram illustrating a flow of the double-sided tape used in the lithium ion battery provided in an embodiment of the present invention, as shown in fig. 5, first the second adhesive layer 1-3 in the double-sided tape 1 is adhered on the surface of the positive plate, and then the positive plate, the separator and the negative plate are prepared to obtain an electric core according to a lamination process or a winding process, after the electric core is prepared, the first adhesive layer 1-1 in the double-sided tape 1 is adhered to the surface of the separator 200, so as to complete a bonding process between the double-sided tape and the separator.
When double-sided tape includes from the type layer, like in the above-mentioned lithium ion battery preparation process, after positive plate preparation is accomplished, need peel off from the double-sided tape surface from the type layer, otherwise in later stage lithium ion battery's preparation process, can break away from the type layer from first adhesive linkage surface automatically, influence lithium ion battery's preparation, but the first tie coat that leaks is bare pastes to the diaphragm easily in the preparation process, cause the regional dislocation of pasting, cause inconvenient for lithium ion battery preparation, consequently, for the ease of lithium ion battery's preparation and double-sided tape's bonding, double-sided tape's first tie coat includes hot melt type and electrolyte resistant type binder, and the second tie coat includes pressure sensitive type and electrolyte resistant type binder not.
The hot-melt type electrolyte-resistant adhesive does not have viscosity at normal temperature, releases viscosity after heat treatment, does not change after being soaked in electrolyte, and can be specifically a polyolefin rubber adhesive; the pressure-sensitive adhesive releases viscosity under the action of pressure, and can swell and lose viscosity after being soaked in electrolyte, so that the double-sided adhesive tape falls off from the surface of the positive plate, and can be polyacrylic acid or high-swelling pressure-sensitive rubber.
In the specific use process, firstly, the area of the surface of the diaphragm, to which the double-sided tape needs to be adhered, is determined, then the adhesive-attaching mechanism winds the release layer and performs centralized recovery, and then the second adhesive layer is adhered to the surface of the positive plate, so that the adhering position of the double-sided tape corresponds to the position of the surface of the diaphragm, to which the double-sided tape needs to be adhered, and as the binder in the first adhesive layer does not have viscosity, the double-sided tape adhered to the surface of the positive plate cannot influence the positive rolled plate, and meanwhile, the adsorption of dust can be reduced, and the influence on the safety performance of the lithium ion battery is avoided; then preparing the positive plate, the diaphragm and the negative plate into a battery cell by adopting a lamination process or a winding process, and carrying out hot pressing on the battery cell at the hot pressing temperature of 30-90 ℃, wherein in the hot pressing process, the viscosity of the binder in the first bonding layer is released and is bonded with the diaphragm; and finally, injecting electrolyte into the battery core after packaging, wherein the electrolyte enables the binder in the second bonding layer to have swelling effect, so that the viscosity is lost or greatly reduced, and the viscosity of the binder in the first bonding layer cannot be reduced, so that the double-sided adhesive tape falls off from the surface of the positive plate and is adhered to the required position of the surface of the diaphragm. The binder may be selected by those skilled in the art according to the kind of the electrolyte, and the present invention is not limited thereto.
To sum up, the utility model provides a double faced adhesive tape can be arranged in pasting of lithium ion battery middle diaphragm, effectively solves the technical difficulty that can't set up lithium ion barrier layer on the diaphragm.
The following technical solution provided by the present invention is explained in detail with reference to specific embodiments:
example 1
The double-sided tape that this embodiment provided is including the second tie coat, substrate layer, first tie coat and the release layer that stack gradually the setting, wherein:
the base material layer is a PET layer with the thickness of 12 mu m;
the second adhesive layer is obtained by polymerizing 40 parts by mass of hard monomer (VAc/LMA), 60 parts by mass of soft monomer (2-EHA/BA) and 0.5 part by mass of initiator, and is a hot-melt type electrolyte-resistant adhesive;
the thickness of the second bonding layer is 4 μm;
the first adhesive layer is obtained by polymerizing 20 parts by mass of polystyrene, 15 parts by mass of polydiene, 15 parts by mass of styrene-butadiene copolymer, 8 parts by mass of petroleum resin, 3 parts by mass of filler and 0.6 part by mass of initiator, and is pressure-sensitive and electrolyte-intolerant;
the thickness of the first bonding layer is 4 μm;
the release layer is a PE release film with the thickness of 50 μm.
The double-sided adhesive tape is adhered to the surface of the positive plate by the method, the positive plate, the diaphragm and the negative plate are assembled into a battery core, the battery core is packaged and injected with electrolyte (EC: PC: EMC: DEC: 1: 1: 1: 1) to prepare the lithium ion battery, the lithium ion battery is hot-pressed at 80 ℃, the lithium ion battery is disassembled after the hot pressing is finished, the position of the double-sided adhesive tape is observed, and the observation result shows that the double-sided adhesive tape is adhered to the corresponding position of the diaphragm and is stripped from the surface of the positive plate.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (8)
1. The lithium ion battery is characterized by comprising a positive plate, a diaphragm and a negative plate, wherein the negative plate comprises a negative current collector and a negative active layer arranged on at least one surface of the negative current collector, and a negative lug is arranged on the surface of the negative current collector;
the surface of the diaphragm is adhered with a double-sided adhesive tape, and the vertical projection area of the negative electrode tab on the diaphragm falls into the vertical projection area of the double-sided adhesive tape on the diaphragm;
the double-sided tape comprises a first bonding layer, a base material layer and a second bonding layer which are sequentially laminated;
the first bonding layer comprises one of organic silicon adhesives, epoxy adhesives, polyurethane adhesives, polyacrylic adhesives and rubber adhesives, and the bonding strength of the first bonding layer is greater than that of the second bonding layer.
2. The lithium ion battery of claim 1, wherein the second adhesive layer comprises one of silicone, epoxy, polyurethane, polyacrylic, and rubber based adhesives.
3. The lithium ion battery of claim 1, wherein the first bonding layer has a thickness of 1-20 μ ι η.
4. The lithium ion battery of claim 2, wherein the second bonding layer has a thickness of 1-20 μ ι η.
5. The lithium ion battery of claim 1, wherein the substrate layer comprises one of PI, PP, PE, PET.
6. The lithium ion battery of claim 5, wherein the substrate layer has a thickness of 3-50 μm.
7. The lithium ion battery of claim 1, wherein the double-sided tape further comprises a release layer, the release layer is disposed on a surface of the first bonding layer away from the substrate layer, and the release layer is one of a PET release film, an OPP release film, a composite release film, a glassine release paper, and a CCK release paper.
8. The lithium ion battery according to claim 7, wherein the release layer has a thickness of 3-100 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122317903.0U CN217499128U (en) | 2021-09-24 | 2021-09-24 | Double-sided adhesive tape and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122317903.0U CN217499128U (en) | 2021-09-24 | 2021-09-24 | Double-sided adhesive tape and lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN217499128U true CN217499128U (en) | 2022-09-27 |
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| CN202122317903.0U Active CN217499128U (en) | 2021-09-24 | 2021-09-24 | Double-sided adhesive tape and lithium ion battery |
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| CN113683974A (en) * | 2021-09-24 | 2021-11-23 | 珠海冠宇电池股份有限公司 | Double-sided adhesive tape and lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113683974A (en) * | 2021-09-24 | 2021-11-23 | 珠海冠宇电池股份有限公司 | Double-sided adhesive tape and lithium ion battery |
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