This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0024846 dated March 04, 2019, and all contents disclosed in the documents of the Korean patent application are incorporated as a part of this specification.
[3]
technical field
[4]
The present invention relates to a pouch for a secondary battery and a pouch-type secondary battery, and more particularly, to a pouch for a secondary battery and a pouch-type secondary battery that can prevent lithium plating even when an overvoltage occurs at a low temperature is about
background
[5]
In general, types of secondary batteries include a nickel cadmium battery, a nickel hydrogen battery, a lithium ion battery, and a lithium ion polymer battery. These secondary batteries are not only used in small products such as digital cameras, P-DVDs, MP3Ps, mobile phones, PDAs, Portable Game Devices, Power Tools and E-bikes, but also in large products requiring high output such as electric and hybrid vehicles and surplus power generation. It is also applied and used in power storage devices that store power or renewable energy and power storage devices for backup.
[6]
In order to manufacture the electrode assembly, a cathode, a separator, and a cathode are manufactured, and these are laminated. Specifically, a positive electrode active material slurry is applied to a positive electrode current collector, and a negative electrode active material slurry is applied to a negative electrode current collector to prepare a positive electrode and a negative electrode. And when a separator is interposed between the manufactured positive electrode and the negative electrode and stacked, unit cells are formed, and the unit cells are stacked on each other, thereby forming an electrode assembly. And when the electrode assembly is accommodated in a specific case and an electrolyte is injected, a secondary battery is manufactured.
[7]
Conventionally, when an overvoltage occurs at a low temperature, lithium plating occurs on the negative electrode, thereby increasing the thickness of the electrode assembly. Accordingly, the overall thickness of the pouch-type secondary battery is increased, and there is a problem in that the assembly quality of the secondary battery is deteriorated and energy efficiency compared to the volume is decreased.
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[8]
An object of the present invention is to provide a pouch for a secondary battery and a pouch-type secondary battery capable of preventing the occurrence of lithium plating even when an overvoltage occurs at a low temperature.
[9]
The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.
means of solving the problem
[10]
A pouch for a secondary battery according to an embodiment of the present invention for solving the above problems is made of a first polymer, and includes a surface protective layer formed on an outermost layer; a sealant layer made of a second polymer and formed on an innermost layer; a gas barrier layer made of metal and laminated between the surface protective layer and the sealant layer; and a heat dissipating layer made of ceramic, laminated between the surface protective layer and the sealant layer, and emitting heat to the outside when a specific pressure is applied.
[11]
In addition, the ceramic may be lambda trititanium pentoxide.
[12]
In addition, the ceramic may be converted into beta trititanium pentoxide when a pressure greater than 60 MPa is applied.
[13]
In addition, the gas barrier layer may be formed in plurality.
[14]
In addition, the heat dissipation layer may be stacked between a plurality of the gas barrier layers.
[15]
In addition, the heat dissipation layer may be stacked on the inner side of the gas barrier layer.
[16]
In addition, the surface protection layer may be formed in plurality.
[17]
In addition, the plurality of surface protective layers, made of PET, the first surface protective layer is formed on the outermost layer; and a second surface protective layer made of nylon and laminated on the inside of the first surface protective layer.
[18]
In addition, the sealant layer may be formed in plurality.
[19]
In addition, the plurality of the sealant layers may include: a first sealant layer made of PPa and formed in an innermost layer; and a second sealant layer made of CPP and laminated on the outside of the first sealant layer.
[20]
According to an embodiment of the present invention for solving the above problems, a pouch-type secondary battery includes an electrode assembly formed by alternately stacking electrodes and a separator; and a pouch-type battery case accommodating the electrode assembly, wherein the battery case includes: a surface protective layer made of a first polymer and formed on an outermost layer; a sealant layer made of a second polymer and formed on an innermost layer; a gas barrier layer made of metal and laminated between the surface protective layer and the sealant layer; and a heat dissipating layer made of ceramic, laminated between the surface protective layer and the sealant layer, and emitting heat to the outside when a specific pressure is applied.
[21]
In addition, the ceramic may be lambda trititanium pentoxide.
[22]
In addition, the gas barrier layer may be formed in plurality.
[23]
In addition, the heat dissipation layer may be stacked between a plurality of the gas barrier layers.
[24]
Other specific details of the invention are included in the detailed description and drawings.
Effects of the Invention
[25]
According to the embodiments of the present invention, there are at least the following effects.
[26]
The pouch for secondary batteries includes a heat dissipation layer made of ceramic containing lambda trititanium pentoxide, and emits heat to the outside when pressure is applied. It is possible to prevent the occurrence of lithium plating by increasing the .
[27]
The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present specification.
Brief description of the drawing
[28]
1 is an assembly view of a pouch-type secondary battery according to an embodiment of the present invention.
[29]
2 is an enlarged cross-sectional view of a pouch-type secondary battery according to an embodiment of the present invention.
[30]
3 is an enlarged cross-sectional view illustrating an increase in the thickness of a pouch-type secondary battery according to an embodiment of the present invention.
[31]
4 is a cross-sectional view of a pouch film according to an embodiment of the present invention.
[32]
5 is a conceptual diagram of Lambda Trititanium Pentoxide and Beta Trititanium Pentoxide.
[33]
6 is a cross-sectional view of a pouch film according to another embodiment of the present invention.
[34]
7 is a cross-sectional view illustrating a state in which a surface protective layer and a sealant layer of a pouch film according to another embodiment of the present invention have a composite film structure.
Modes for carrying out the invention
[35]
Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.
[36]
Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly specifically defined.
[37]
The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components.
[38]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[39]
1 is an assembly view of a pouch-type secondary battery 1 according to an embodiment of the present invention.
[40]
As shown in FIG. 1 , a pouch-type secondary battery 1 according to an embodiment of the present invention includes a pouch-type battery case 13 and an electrode assembly 10 accommodated in the battery case 13 . includes
[41]
The electrode assembly 10 may be a laminate structure having two electrodes, such as an anode and a cathode, and a separator interposed between the electrodes to insulate the electrodes from each other or a separator disposed on the left or right side of any one electrode. . The laminated structure may have various forms without limitation, such as a positive electrode and a negative electrode having a predetermined standard may be stacked with a separator interposed therebetween, and may be wound in the form of a jelly roll. The two electrodes have a structure in which an active material slurry is applied to an electrode current collector in the form of a metal foil or a metal mesh including aluminum and copper, respectively. In general, the slurry may be formed by stirring a granular active material, an auxiliary conductor, a binder, a plasticizer, and the like in a state in which a solvent is added. The solvent is removed in a subsequent process.
[42]
As shown in FIG. 1 , the electrode assembly 10 includes an electrode tab 11 . The electrode tab 11 is respectively connected to the positive electrode and the negative electrode of the electrode assembly 10 , and protrudes to the outside of the electrode assembly 10 , and serves as a path through which electrons can move between the inside and the outside of the electrode assembly 10 . . The current collector of the electrode assembly 10 includes a portion to which the electrode active material is applied and a distal portion to which the electrode active material is not applied, that is, an uncoated portion. In addition, the electrode tab 11 may be formed by cutting the uncoated area or may be formed by connecting a separate conductive member to the uncoated area by ultrasonic welding or the like. As shown in FIG. 1 , the electrode tabs 11 may protrude side by side from one side of the electrode assembly 10 in the same direction, but are not limited thereto and may protrude in different directions.
[43]
An electrode lead 12 is connected to the electrode tab 11 of the electrode assembly 10 by spot welding or the like. A part of the electrode lead 12 is surrounded by the insulating portion 14 . The insulating part 14 is positioned limitedly in the sealing part to which the upper pouch 131 and the lower pouch 132 of the battery case 13 are heat-sealed, and is attached to the battery case 13 . In addition, electricity generated from the electrode assembly 10 is prevented from flowing to the battery case 13 through the electrode lead 12 , and the sealing of the battery case 13 is maintained. Accordingly, the insulating portion 14 is made of a non-conductive material that does not conduct electricity well. In general, as the insulating part 14, an insulating tape that is easy to attach to the electrode lead 12 and has a relatively thin thickness is often used. have.
[44]
The electrode leads 12 may extend in the same direction or in opposite directions depending on the formation positions of the positive electrode tab 111 and the negative electrode tab 112 . The material of the positive lead 121 and the negative lead 122 may be different from each other. That is, the positive electrode lead 121 may be made of the same aluminum (Al) material as the positive electrode plate, and the negative electrode lead 122 may be made of the same copper (Cu) material as the negative electrode plate or nickel (Ni) coated copper. And a portion of the electrode lead 12 protruding to the outside of the battery case 13 becomes a terminal portion, and is electrically connected to the external terminal.
[45]
The battery case 13 is a pouch made of a flexible material. In addition, the battery case 13 accommodates and seals the electrode assembly 10 so that a portion of the electrode lead 12, that is, the terminal portion is exposed. As shown in FIG. 1 , the battery case 13 includes an upper pouch 131 and a lower pouch 132 . A cup portion 133 is formed in the lower pouch 132 to provide an accommodating space 1331 accommodating the electrode assembly 10 , and the upper pouch 131 includes the electrode assembly 10 in the battery case 13 . The accommodating space 1331 is covered from the upper part so as not to be separated to the outside of the . In FIG. 1 , the cup part 133 is illustrated as being formed only in the lower pouch 132 , but the present invention is not limited thereto and may be formed in various ways, such as may be formed in the upper pouch 131 . The upper pouch 131 and the lower pouch 132 may be manufactured with one side connected to each other as shown in FIG.
[46]
When the electrode lead 12 is connected to the electrode tab 11 of the electrode assembly 10 and the insulating portion 14 is formed on a portion of the electrode lead 12 , the cup portion 133 of the lower pouch 132 is provided. The electrode assembly 10 is accommodated in the accommodation space 1331 , and the upper pouch 131 covers the space from the top. Then, the electrolyte is injected therein and the sealing part formed on the edges of the upper pouch 131 and the lower pouch 132 is sealed. The electrolyte is to move lithium ions generated by the electrochemical reaction of the electrode during charging and discharging of the secondary battery 1, and a polymer using a non-aqueous organic electrolyte or a polymer electrolyte, which is a mixture of lithium salt and high-purity organic solvents. may include Through this method, the pouch-type secondary battery 1 may be manufactured.
[47]
2 is an enlarged cross-sectional view of a pouch-type secondary battery 1 according to an embodiment of the present invention, and FIG. 3 is an increase in the thickness of the pouch-type secondary battery 1 according to an embodiment of the present invention. It is a cross-sectional enlarged view.
[48]
As described above, when an overvoltage occurs at a low temperature, the charging current density increases, and accordingly, lithium ions of the positive electrode are not sufficiently quickly accommodated in the negative electrode active material coating layer. Thereby, lithium ions accumulate on the surface of the negative electrode and precipitate as metallic lithium. This is called lithium plating.
[49]
When such lithium plating occurs on the negative electrode, the thickness of the electrode assembly 10 increases as shown in FIG. 3 . Accordingly, the overall thickness of the pouch-type secondary battery 1 may increase, thereby reducing the assembly quality of the secondary battery 1 and reducing the energy efficiency compared to the volume.
[50]
4 is a cross-sectional view of a pouch film 134 according to an embodiment of the present invention.
[51]
According to an embodiment of the present invention, the secondary battery pouch includes a heat dissipation layer 1344 made of ceramic containing lambda trititanium pentoxide, and when pressure is applied, heat is emitted to the outside. , it is possible to prevent the occurrence of lithium plating by increasing the temperature even if overvoltage occurs at a low temperature.
[52]
To this end, the pouch for a secondary battery according to an embodiment of the present invention includes a surface protective layer 1342 made of a first polymer and formed on an outermost layer; a sealant layer 1343 made of a second polymer and formed in an innermost layer; a gas barrier layer 1341 made of metal and laminated between the surface protection layer 1342 and the sealant layer 1343; and a heat dissipating layer 1344 made of ceramic, laminated between the surface protection layer 1342 and the sealant layer 1343 , and emitting heat to the outside when a specific pressure is applied. In addition, the ceramic is lambda trititanium pentoxide, and when a pressure greater than 60 MPa is applied, it may be converted into beta trititanium pentoxide.
[53]
The pouch, which is the battery case 13 of the pouch-type secondary battery 1 according to an embodiment of the present invention, is manufactured by drawing and molding the pouch film 134 . That is, the pouch film 134 is stretched with a punch or the like to form the cup portion 133 . According to an embodiment of the present invention, such a pouch film 134 is, as shown in FIG. 4, a gas barrier layer (Gas Barrier Layer, 1341), a surface protection layer (Surface Protection Layer, 1342), and a sealant layer (Sealant). Layer, 1343).
[54]
The gas barrier layer 1341 secures the mechanical strength of the pouch, blocks the ingress of gas or moisture from the outside of the secondary battery 1 , and prevents leakage of the electrolyte. In general, the gas barrier layer 1341 is made of metal, and the metal may include aluminum. Aluminum can secure a predetermined level or more of mechanical strength, while having a light weight, and supplementing the electrochemical properties of the electrode assembly 10 and the electrolyte and securing heat dissipation. However, the present invention is not limited thereto, and various materials may be included in the gas barrier layer 1341 . For example, it may be one or a mixture of two or more selected from the group consisting of iron (Fe), chromium (Cr), manganese (Mn), nickel (Ni), and aluminum (Al). In this case, when the gas barrier layer 1341 is made of an iron-containing material, mechanical strength is improved, and when the gas barrier layer 1341 is made of an aluminum-containing material, flexibility is improved, so that each characteristic may be taken into consideration.
[55]
The gas barrier layer 1341 may have a thickness of 30 to 80 μm if made of aluminum. If it is thinner than 30 μm, it becomes excessively thin and moldability is deteriorated, and there is a problem in that the quality of the battery is deteriorated because the number of pinholes is increased. Conversely, if the thickness is greater than 80 μm, the overall thickness of the pouch is increased, thereby increasing the volume of the secondary battery and lowering the energy density. More preferably, the gas barrier layer 1341 may have a thickness of 30 to 50 μm.
[56]
The surface protection layer 1342 is made of the first polymer, and is located in the outermost layer to protect the secondary battery 1 from friction and collision with the outside, and to electrically insulate the electrode assembly 10 from the outside. Herein, the outermost layer refers to a layer positioned at the end of the gas barrier layer 1341 in a direction opposite to the direction in which the electrode assembly 10 is positioned. The first polymer for producing the surface protective layer 1342 is polyethylene, polypropylene, polycarbonate, polyethylene terephthalate (PET), polyvinyl chloride, acrylic polymer, polyacrylonitrile, polyimide, polyamide, cellulose, It may be made of one or more materials selected from the group consisting of aramid, nylon, polyester, polyparaphenylenebenzobisoxazole, polyarylate, Teflon, and glass fiber. In particular, a polymer such as nylon resin or polyethylene terephthalate (PET) having mainly abrasion resistance and heat resistance is used.
[57]
The surface protective layer 1342 may have a thickness of 12 to 25 μm if made of PET. If it is thinner than 12 μm, there is a problem in that external insulating properties are lowered and adhesion to the gas barrier layer 1341 is also lowered. Conversely, if the thickness is greater than 25 μm, the overall thickness of the pouch is increased, thereby increasing the volume of the secondary battery and lowering the energy density. More preferably, the surface protection layer 1342 may have a thickness of 20 to 25 μm.
[58]
The surface protection layer 1342 may have a single-layer structure made of any one material, or may be formed in plurality. That is, it may have a composite film structure in which two or more materials are each layered. In this case, the plurality of surface protective layers 1342 are made of polyethylene terephthalate (PET) and a first surface protective layer formed on the outermost layer and nylon (Nylon), and laminated on the inside of the first surface protective layer. A second surface protective layer may be included.
[59]
The sealant layer 1343 is made of the second polymer and is located in the innermost layer to directly contact the electrode assembly 10 . Here, the innermost layer refers to a layer positioned at the end of the gas barrier layer 1341 in the direction in which the electrode assembly 10 is positioned. When the pouch film 134 of the stacked structure as described above is drawn and molded using a punch or the like, a portion is elongated to form the cup portion 133 including the pocket-shaped accommodation space 1331 . do. And, when the electrode assembly 10 is accommodated in the receiving space 1331, the electrolyte is injected. After that, when the upper pouch 131 and the lower pouch 132 are brought into contact with each other and thermally compressed on the sealing portion, the sealant layers 1343 are adhered to each other, thereby sealing the pouch. In this case, the sealant layer 1343 must have insulation because it directly contacts the electrode assembly 10 , and must have corrosion resistance because it also comes in contact with the electrolyte. In addition, since the inside must be completely sealed to block material movement between the inside and the outside, it must have high sealing properties. That is, the sealing portion to which the sealant layers 1343 are bonded should have excellent thermal bonding strength. In general, the second polymer for manufacturing the sealant layer 1343 is polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acrylic polymer, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, It may be made of one or more materials selected from the group consisting of nylon, polyester, polyparaphenylenebenzobisoxazole, polyarylate, Teflon, and glass fiber. In particular, a polyolefin-based resin such as polypropylene (PP) or polyethylene (PE) is mainly used. Polypropylene (PP) has excellent mechanical properties such as tensile strength, rigidity, surface hardness, abrasion resistance, heat resistance, and chemical properties such as corrosion resistance, and is mainly used for manufacturing the sealant layer 1343 . Furthermore, it may be composed of Cated Polypropylene or Acid Modified Polypropylene or polypropylene-butylene-ethylene terpolymer. Here, the acid-treated polypropylene may be MAH PP (maleic anhydride polypropylene).
[60]
The sealant layer 1343 may have a thickness of 30 to 100 μm if it is made of polypropylene (PP). If it is thinner than 30 μm, there is a problem in that sealing durability is lowered, such as internal destruction during sealing. Conversely, if the thickness is greater than 100 μm, the overall thickness of the pouch increases, and thus the volume of the secondary battery may increase and energy density may decrease. More preferably, the sealant layer 1343 may have a thickness of 50 to 80 μm.
[61]
The sealant layer 1343 may have a single-layer structure made of any one material, or may be formed in plurality. That is, it may have a composite film structure in which two or more materials are each layered. In this case, the plurality of sealant layers 1343 are made of acid-treated polypropylene (Acid Modified Polypropylene, PPa), and a first sealant layer formed in the innermost layer and non-stretched polypropylene (Cated Polypropylene, CPP), A second sealant layer laminated outside the first sealant layer may be included.
[62]
According to an embodiment of the present invention, the pouch film 134 is made of ceramic, is laminated between the surface protection layer 1342 and the sealant layer 1343 , and when a specific pressure is applied, heat is emitted to the outside. It further includes an emissive layer 1344 .
[63]
The heat dissipation layer 1344 is made of ceramic, which absorbs heat and is converted into another material when a specific pressure is applied, thereby discharging the absorbed heat to the outside. Here, the ceramic may be lambda tri-titanium pentoxide (λ-Ti 3 O 5 ).
[64]
As shown in FIG. 4 , the heat dissipation layer 1344 may be stacked on the inner side of the gas barrier layer 1341 . In particular, it is preferable that one surface of the heat dissipation layer 1344 is laminated in direct contact with the gas barrier layer 1341 . Thereby, since the heat dissipation layer 1344 is disposed between the electrode assembly 10 and the gas barrier layer 1341, when the thickness of the electrode assembly 10 increases, the gas barrier layer 1341 made of metal By this, pressure can be effectively applied to the heat dissipation layer 1344 .
[65]
5 is a conceptual diagram of Lambda Trititanium Pentoxide and Beta Trititanium Pentoxide.
[66]
As shown in FIG. 5, lambda trititanium pentoxide (λ-Ti 3 O 5 ) consists only of titanium atoms (Ti) and oxygen atoms (O), and can absorb heat of approximately 230 kJ/L. . And in a state in which the lambda trititanium pentoxide absorbs and stores heat, when a pressure greater than about 60 MPa is applied, it is converted into beta trititanium pentoxide (β-Ti 3 O 5 ). In this case, the lambda trititanium pentoxide and the beta trititanium pentoxide differ only in the physical bonding structure of atoms, and the constituent materials are not chemically different.
[67]
As the lambda tri-titanium pentoxide is converted into beta tri-titanium pentoxide under pressure, the stored heat of about 230 kJ/L is released to the outside. This raises the ambient temperature.
[68]
As described above, when an overvoltage occurs at a low temperature, the charging current density increases, lithium plating occurs on the negative electrode, and the thickness of the electrode assembly increases. Accordingly, the overall thickness of the pouch-type secondary battery is increased, and there is a problem in that the assembly quality of the secondary battery is deteriorated and energy efficiency compared to the volume is decreased.
[69]
However, according to an embodiment of the present invention, the secondary battery pouch includes a heat dissipation layer 1344 made of ceramic containing lambda trititanium pentoxide, and when pressure is applied, heat is emitted to the outside. By doing so, it is possible to prevent lithium plating from occurring by increasing the temperature even if overvoltage occurs at a low temperature.
[70]
Beta tri-titanium pentoxide that has released heat is converted into lambda tri-titanium pentoxide by absorbing the surrounding heat again. Accordingly, the heat dissipation layer 1344 may continuously repeat the above process.
[71]
6 is a cross-sectional view of a pouch film 134a according to another embodiment of the present invention.
[72]
In the pouch film 134 according to an embodiment of the present invention, the gas barrier layer 1341 has a single-layer structure, and the heat dissipation layer 1344 is stacked inside the gas barrier layer 1341 .
[73]
However, in the pouch film 134a according to another embodiment of the present invention, as shown in FIG. 6 , a plurality of gas barrier layers 1341a and 1341b may be formed. That is, it may have a composite film structure in which two or more materials are each layered. Even in this case, the plurality of gas barrier layers 1341a and 1341b may all be made of the same type of metal. That is, it may be prepared by using one or a mixture of two or more selected from the group consisting of iron (Fe), chromium (Cr), manganese (Mn), nickel (Ni), and aluminum (Al).
[74]
In addition, the heat dissipation layer 1344 may be stacked between the plurality of gas barrier layers 1341a and 1341b, as shown in FIG. 6 . In particular, it is preferable that both surfaces of the heat dissipation layer 1344 be laminated in direct contact with the gas barrier layers 1341a and 1341b. Thereby, when the thickness of the electrode assembly 10 increases, the pressure can be more effectively applied to the heat dissipation layer 1344 by the gas barrier layers 1341a and 1341b made of metal.
[75]
7 is a cross-sectional view illustrating a state in which the surface protection layer 1342 and the sealant layer 1343 of the pouch film 134a according to another embodiment of the present invention have a composite film structure.
[76]
According to another embodiment of the present invention, the surface protection layer 1342 may have a single-layer structure made of any one material, but may be formed in plurality. That is, it may have a composite film structure in which two or more materials are each layered. In this case, the plurality of surface protective layers 1342 are made of polyethylene terephthalate (PET) and made of a first surface protective layer 1342a and nylon (Nylon) formed on the outermost layer, and of the first surface protective layer A second surface protection layer 1342b laminated on the inside may be included.
[77]
The sealant layer 1343 may have a single-layer structure made of any one material, or may be formed in plurality. That is, it may have a composite film structure in which two or more materials are each layered. In this case, the plurality of sealant layers 1343 are made of acid-treated polypropylene (Acid Modified Polypropylene, PPa) and include a first sealant layer 1343a and non-stretched polypropylene (CPP) formed in the innermost layer. It may include a second sealant layer 1343b that is manufactured and laminated on the outside of the first sealant layer.
[78]
Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and various embodiments derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.
Claims
[Claim 1]
a surface protective layer made of a first polymer and formed on an outermost layer; a sealant layer made of a second polymer and formed on an innermost layer; a gas barrier layer made of metal and laminated between the surface protective layer and the sealant layer; and a heat release layer made of ceramic, laminated between the surface protective layer and the sealant layer, and emitting heat to the outside when a specific pressure is applied.
[Claim 2]
According to claim 1, wherein the ceramic, lambda trititanium pentoxide (lambda trititanium pentoxide), secondary battery pouch.
[Claim 3]
The pouch for a secondary battery according to claim 2, wherein the ceramic is converted into beta trititanium pentoxide when a pressure greater than 60 MPa is applied.
[Claim 4]
The pouch for a secondary battery according to claim 1, wherein the gas barrier layer is formed in plurality.
[Claim 5]
The pouch for a secondary battery according to claim 4, wherein the heat dissipation layer is laminated between a plurality of the gas barrier layers.
[Claim 6]
The pouch for a secondary battery according to claim 1, wherein the heat dissipation layer is stacked on the inner side of the gas barrier layer.
[Claim 7]
The pouch for a secondary battery according to claim 1, wherein the surface protective layer is formed in plurality.
[Claim 8]
The method according to claim 7, wherein the plurality of surface protection layers comprises: a first surface protection layer made of PET and formed on an outermost layer; and a second surface protective layer made of nylon and laminated on the inside of the first surface protective layer.
[Claim 9]
The pouch for a secondary battery according to claim 1, wherein the sealant layer is formed in plurality.
[Claim 10]
10. The method of claim 9, wherein the plurality of sealant layers comprises: a first sealant layer made of PPa and formed in an innermost layer; and a second sealant layer made of CPP and laminated on the outside of the first sealant layer.
[Claim 11]
an electrode assembly formed by alternately stacking electrodes and separators; and a pouch-type battery case accommodating the electrode assembly, wherein the battery case includes: a surface protective layer made of a first polymer and formed on an outermost layer; a sealant layer made of a second polymer and formed on an innermost layer; a gas barrier layer made of metal and laminated between the surface protective layer and the sealant layer; and a heat dissipating layer made of ceramic, laminated between the surface protective layer and the sealant layer, and emitting heat to the outside when a specific pressure is applied.
[Claim 12]
The pouch-type secondary battery of claim 11 , wherein the ceramic is lambda trititanium pentoxide.
[Claim 13]
The pouch-type secondary battery of claim 11 , wherein the gas barrier layer is formed in plurality.
[Claim 14]
The pouch-type secondary battery according to claim 13, wherein the heat dissipation layer is laminated between a plurality of the gas barrier layers.