KR102149993B1 - Laminate and battery cell module using same - Google Patents

Abstract

The embodiment relates to a laminate capable of improving light weight, heat dissipation, and stability of a battery cell module by including a first adhesive layer, a graphite sheet, a second adhesive layer, and an elastic sheet, and a battery cell module using the same.

Description

Stacked body and battery cell module using the same {LAMINATE AND BATTERY CELL MODULE USING SAME}

The embodiment relates to a laminate capable of improving light weight, heat dissipation, and stability of a battery cell module by including a first adhesive layer, a graphite sheet, a second adhesive layer, and an elastic sheet, and a battery cell module using the same.

In electric vehicles, the reliability and stability of the battery system act as the most important factor in determining the marketability. Therefore, the proper temperature range of the battery system of 20℃ to 40℃ should be maintained in order to prevent degradation of the battery performance due to various changes in temperature. do. Accordingly, a battery system comprising a plurality of battery cells needs a cooling structure for cooling heat generated when charging or discharging the battery cells.

Conventionally, a battery system for flowing coolant into a heat sink made of a metal material such as aluminum or copper has been used. However, since a metal material such as aluminum or copper has high thermal conductivity, the cooling effect is deteriorated, and there is a disadvantage in that the volume and weight are large.

For example, Korean Patent Application Publication No. 2018-0080614 describes a battery module in which a heat exchange pad through which a cooling medium is distributed is made of a material (ceramic powder) with high heat transfer efficiency to improve cooling efficiency, but the cooling pipe of the heat exchange pad is Since it is made of aluminum or copper, it is difficult to obtain sufficient heat dissipation, space, and light weight.

Republic of Korea Patent Publication No. 2018-0080614

Therefore, the embodiment is to provide a laminate that can improve lightness and stability as well as excellent heat dissipation and a battery cell module using the same.

A laminate according to an embodiment includes a first adhesive layer; Graphite sheet; A second adhesive layer; And an elastic sheet, wherein a surface area of the graphite sheet is smaller than a surface area of the first adhesive layer.

A battery cell module according to an embodiment includes a housing; A plurality of battery cells arranged in parallel in the housing; And a heat radiation sheet interposed between the plurality of battery cells, wherein the heat radiation sheet includes a first adhesive layer, a graphite sheet, a second adhesive layer, and an elastic sheet.

In the laminate according to the embodiment, since the surface area of the graphite sheet is smaller than the surface area of the first adhesive layer, the graphite sheet is not exposed to the outside, and stability may be improved.

The battery cell module according to the embodiment includes a heat dissipation sheet including a first adhesive layer, a graphite sheet, a second adhesive layer, and an elastic sheet, thereby improving heat dissipation, light weight and stability.

1 is a cross-sectional view of a conventional battery cell module.
2 is a cross-sectional view of another conventional battery cell module.
3 is a cross-sectional view of a laminate according to an embodiment.
4 to 7 are cross-sectional views of a battery cell module according to an embodiment.
8 is a schematic diagram of a surface of a graphite sheet according to an embodiment.
9 shows a photograph of a surface of a graphite sheet according to an embodiment.
10 is a photograph of observation of the surface of a graphite sheet according to an embodiment with an atomic force microscope (AFM).

Hereinafter, the invention will be described in detail through embodiments. The implementation is not limited to the content disclosed below, and may be modified in various forms unless the gist of the invention is changed.

In the present specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

In addition, all numbers and expressions representing amounts of components, reaction conditions, and the like described in the present specification are to be understood as being modified by the term "about" in all cases unless otherwise specified.

1 is a cross-sectional view of a conventional battery cell module. In FIG. 1, a plurality of battery cells are provided in a housing, a buffer pad and a cooling fin are respectively interposed between the plurality of battery cells, and a battery cell module including a thermal conductive material (TIM) and a heat sink is provided under the housing. Is illustrated.

As shown in FIG. 1, in a conventional battery cell module, cooling fins are interposed between a plurality of battery cells to move heat generated from the battery cells to a heat sink, and the heat moved along the cooling fins is internally By moving to the flowing heat sink, it is possible to maintain the management temperature (20°C to 40°C) of the battery cell module. The buffer pad interposed between the plurality of battery cells may serve to protect a battery that expands when the management temperature is exceeded. In addition, the heat transfer material layer may be interposed between the heat sink and the housing so that heat transferred from the battery cell can be well transferred to the heat sink.

However, in such a conventional battery cell module, since the housing, the cooling fin, and the heat sink are made of metal having high thermal conductivity such as aluminum or copper, sufficient heat dissipation properties cannot be obtained. In addition, since it is made of metal, the battery cell module is bulky and has a heavy weight.

2 is a cross-sectional view of another conventional battery cell module. In FIG. 2, a battery cell module including a plurality of battery cells in a housing, a buffer pad interposed between the plurality of battery cells, and a gap filler, a heat transfer material layer, and a heat dissipation plate are provided under the housing. It is illustrated.

As shown in FIG. 2, conventionally, in order to reduce the weight, a battery cell module other than a cooling fin interposed between a plurality of battery cells has been used.

However, although such a conventional battery cell module further includes a gap filler capable of increasing the heat dissipation effect by removing voids under the plurality of battery cells, a sufficient heat dissipation effect cannot be obtained. There was a drawback of increasing the risk of swelling or exploding.

Laminate

A laminate according to an embodiment includes a first adhesive layer; Graphite sheet; A second adhesive layer; And an elastic sheet, wherein a surface area of the graphite sheet is smaller than a surface area of the first adhesive layer.

According to one embodiment, the surface area of the graphite sheet is smaller than that of the second adhesive layer and the elastic sheet.

According to one embodiment, the surface area of the elastic sheet may be smaller than that of the graphite sheet and the second adhesive layer.

According to one embodiment, the graphite sheet is sealed by the first adhesive layer, the second adhesive layer, and the elastic sheet and is not exposed to the outside. Specifically, since the graphite sheet is not exposed to the outside as described above, the heat dissipation effect can be improved, as well as the reduction in charging and discharging efficiency of the battery cell due to graphite dust generated over time can be prevented. .

3 is a cross-sectional view of a laminate according to an embodiment. 3, a second adhesive layer is provided on an elastic sheet, a graphite sheet that is smaller than the surface area of the second adhesive layer and the elastic sheet is provided on the second adhesive layer, and is larger than the surface area of the graphite sheet on the graphite sheet. A laminate in which the graphite sheet is sealed and is not exposed to the outside by providing the first adhesive layer is illustrated.

First and second adhesive layers

According to one embodiment, the first adhesive layer may be a single-sided or double-sided adhesive layer, and the second adhesive layer may be a double-sided adhesive layer.

Specifically, the first adhesive layer is laminated on the upper surface of the graphite sheet, and since the surface area of the first adhesive layer is larger than the surface area of the graphite sheet, the side thickness portion of the graphite sheet may also be sealed by the first adhesive layer. More specifically, the first adhesive layer and the second adhesive layer are adhered to each other to completely seal the graphite sheet.

In addition, the second adhesive layer is a double-sided adhesive layer and may fix the graphite sheet and the elastic sheet.

According to one embodiment, the thickness of the first adhesive layer may be 0.005 mm to 1 mm. For example, the thickness of the first adhesive layer may be 0.005 mm to 0.9 mm, 0.005 mm to 0.5 mm, or 0.005 mm to 0.015 mm. When the above range is satisfied, the first adhesive layer may implement required adhesion performance without reducing the heat dissipation effect of the graphite sheet.

According to one embodiment, the thickness of the second adhesive layer may be 0.005 mm to 1 mm. For example, the thickness of the second adhesive layer may be 0.005 mm to 0.9 mm, 0.005 mm to 0.5 mm, or 0.005 mm to 0.015 mm. When the above range is satisfied, the second adhesive layer may implement required adhesion performance without reducing the heat dissipation effect of the graphite sheet.

According to one embodiment, each of the first adhesive layer and the second adhesive layer may include one selected from the group consisting of an acrylic adhesive, a silicone adhesive, a urethane adhesive, and a combination thereof. For example, an acrylic adhesive or a silicone adhesive may be included, and it is preferable to include a silicone adhesive in terms of thermal conductivity, but is not limited thereto.

Graphite sheet

The thermal conductivity of a metal material such as aluminum or copper is isotropic, whereas the graphite sheet has different thermal conductivity in the thickness direction and the plane direction due to the structure of graphite particles having an anisotropic arrangement.

Specifically, the graphite sheet generally has a thermal conductivity of 100 W/mk or more in a plane direction, and a thermal conductivity of 20 W/mk or less in a horizontal direction. Accordingly, since the battery module of the embodiment includes a graphite sheet, heat generated from a plurality of battery cells can be rapidly transferred to the lower heat sink, thereby improving heat dissipation.

According to one embodiment, a ratio of thermal conductivity in a plane direction to thermal conductivity in a thickness direction of the graphite sheet is 300 or more. Specifically, the thermal conductivity in the thickness direction of the graphite sheet may be 1 W/mK to 20 W/mK, and the thermal conductivity in the plane direction may be 800 W/mK to 2,000 W/mK. For example, the thermal conductivity in the thickness direction may be 1 W/mK to 18 W/mK, 3 W/mK to 20 W/mK, or 5 W/mK to 20 W/mK, and the thermal conductivity in the plane direction May be 900 W/mK to 2,000 W/mK, 1,000 W/mK to 1,800 W/mK, 1,200 W/mK to 2,000 W/mK, or 1,200 W/mK to 1,800 W/mK.

According to one embodiment, the graphite sheet has a surface structure in the form of a fabric in which weft and warp are woven. Specifically, the graphite sheet may include an inner layer including graphitized fibers and an outer layer of graphite. More specifically, the graphite sheet may include an inner layer including graphitized fibers and an outer graphite layer covering one side or both sides of the inner layer.

The surface structure of the graphite sheet may be the same as the surface of the fibers forming the inner layer. The fiber is a fabric substrate, and may be a substrate having a woven structure in which the surface structure of the graphite sheet manufactured using the same has the above-described structure.

The inner layer may include a fiber bundle including a plurality of graphite fibers. Specifically, the inner layer may be made of a fiber bundle including a plurality of graphite fibers. In addition, the fiber bundle may include voids formed between a plurality of graphite fibers. Further, the inner layer may include a woven fabric formed of graphite fibers or graphite fiber bundles, in which weft and warp are woven.

The inner layer may include fibers in which natural fibers or artificial fibers are graphitized. Specifically, the inner layer may be a fiber in which natural fibers or artificial fibers are carbonized and graphitized.

The natural fiber may be at least one selected from the group consisting of cellulose fibers, protein fibers, and mineral fibers. The cellulose fibers are, for example, (i) seed fibers such as cotton or kapok, (ii) stem fibers such as flax, germ, hemp, or jute, (iii) fruit fibers such as palm fibers, and (iv) And leaf fibers such as manila hemp, abaca, or sisalma. Further, the protein fibers include, for example, (i) wool fibers, (ii) silk fibers and (iii) hair fibers. The mineral fibers include, for example, (i) artificial mineral fibers such as glass wool and mineral wool, and (ii) asbestos fiberized by liquefaction of glass, rock, and other minerals at high temperatures. Specifically, the natural fiber may include one or more selected from the group consisting of cotton, hemp, wool and silk.

The artificial fiber may be at least one selected from the group consisting of organic fibers and inorganic fibers. The organic fibers include, for example, (i) cellulose-based fibers such as rayon, tencel (lyocell), modal, etc., or regenerated fibers including protein-based fibers, (ii) cellulose fibers such as acetate, triacetate, etc. Semi-synthetic fibers, or (iii) polyamide fibers, polyester fibers, polyurethane fibers, polyethylene fibers, polyvinyl chloride fibers, polyfluoroethylene fibers, polyvinyl alcohol fibers, acrylic fibers or polypropylene Synthetic fibers such as fiber based fibers are mentioned. Specifically, the artificial fiber is at least one synthetic fiber selected from the group consisting of nylon, polyester, polyurethane, polyethylene, polyvinyl chloride, polyfluoroethylene, polyvinyl alcohol, acrylic and polypropylene; Or it may include one or more cellulose-based fibers selected from the group consisting of rayon, acetate, and triacetate.

For example, the inner layer may include a grid structure having a pitch of 20 µm to 200 µm and a width of 60 µm to 200 µm.

The graphite outer layer may cover one side or both sides of the inner layer. Specifically, the graphite outer layer is composed of a first graphite outer layer coated on one surface of the graphite inner layer and a second graphite outer layer coated on the other side of the graphite inner layer, and a portion of the first graphite outer layer and the second graphite outer layer Can be connected.

The graphite outer layer may be a polymer resin graphitized. In addition, the outer layer of graphite may include natural graphite or expanded graphite.

The polymer resin may include one or more of the group consisting of polyimide, polyamic acid, polyvinyl chloride, polyester, polyurethane, polyethylene, polyfluoroethylene, polyvinyl alcohol, acrylic and polypropylene. Specifically, the polymer resin may include one or more of the group consisting of polyimide, polyamic acid, and polyvinyl chloride having a weight average molecular weight of 200,000 g/mol to 300,000 g/mol.

Specifically, the graphite sheet may be prepared by manufacturing a fiber base material and a multilayer body including a polymer coating layer on one or both sides of the fiber base material, and then integrally carbonizing and graphitizing the multilayer body. By performing a process of carbonizing and graphitizing at a predetermined temperature, both the fiber base material and the polymer coating layer constituting the multilayer body are graphitized, whereby a graphite sheet can be manufactured.

When the graphite sheet is manufactured by graphitizing the multilayer body as described above, there is an advantage that a graphite sheet having a relatively thick thickness and excellent thermal conductivity can be manufactured inexpensively.

In this case, the thickness of one of the polymer coating layers may be 30 µm to 50 µm. For example, when the polymer coating layer is formed on both sides of the fiber substrate, the total thickness of the polymer coating layer of the second layer may be 60 μm to 100 μm. When the thickness of the polymer coating layer is formed in the above thickness range, the laminate may have a woven structure derived from the fibrous substrate on the surface of the graphite sheet after carbonization and graphitization.

The fiber substrate may be one or more selected from the group consisting of natural fibers and artificial fibers. The natural fibers and artificial fibers are as described in the inner layer.

The polymer coating layer is as described in the polymer resin of the outer layer.

In addition, the graphite sheet may include a grid structure having a pitch of 20 µm to 200 µm and a width of 60 µm to 200 µm.

8 and 9, the graphite sheet may have a surface structure in the form of a fabric in which weft and warp are woven.

In this case, the widths d1 and d2 of the weft yarn A and the warp yarn B may be 20 µm to 200 µm, 30 µm to 170 µm, or 50 µm to 170 µm, respectively. In addition, the weft (A) and the warp (B) may have a pitch (P1, P2) of 20 µm to 200 µm, 30 µm to 170 µm, or 50 µm to 170 µm, respectively.

In addition, the surface structure of the graphite sheet may satisfy the weft (A) X warp (B) of 80 to 130 X 100 to 150 count/inch. For example, the surface structure of the graphite sheet may satisfy the weft (A) X warp (B) 130 X 150 count/inch, 100 X 120 count/inch, or 80 X 100 count/inch.

The graphite sheet may have a predetermined roughness on the surface by having the above-described surface structure. Specifically, referring to FIG. 8, the surface of the graphite sheet has a step difference between a portion C where the weft yarn A and the warp yarn B overlap and a portion D that does not overlap.

According to one embodiment, the surface roughness Ra of the graphite sheet may be 0.5 µm to 10 µm (see FIG. 10). More specifically, the graphite sheet may have a surface roughness (Ra) of 1 μm to 8 μm, or 2 μm to 6 μm.

According to one embodiment, the thickness of the graphite sheet is 0.01 mm to 1 mm. Specifically, the graphite sheet may have a thickness of 0.01 mm to 0.5 mm, 0.01 mm to 0.2 mm, 0.01 mm to 0.1 mm, or 0.05 mm to 0.1 mm. When the thickness of the graphite sheet is within the above range, it may be advantageous in terms of heat capacity.

The graphite sheet has a bending radius of 5 mm (R), a bending angle of 180 degrees, a load of 0.98 N, and a bending speed of 90 times/min. I can. Specifically, the graphite sheet may have a reciprocating bending number of 10,000 to 20,000 times, 10,000 to 18,000 times, or 10,000 to 15,000 times as a result of the MIT flexibility test.

The graphite sheet has a specific heat of 0.5 J/gK to 1.0 J/gK, 0.5 J/gK to 0.9 J/gK, 0.6 J/gK to 0.9 J/gK, or 0.7 J/gK to 0.9 J/gK at 50°C. Can be The density of the graphite sheet may be 0.5 g/cm 3 to 2.5 g/cm 3, 0.5 g/cm 3 to 2.0 g/cm 3, or 0.8 g/cm 3 to 2.0 g/cm 3.

Elastic sheet

The elastic sheet may include a polymer resin. Specifically, the elastic sheet may include a vinyl-based polymer.

The vinyl-based polymer may include at least one selected from the group consisting of polyvinyl butyral and ethylene-vinyl acetate. Specifically, the vinyl-based polymer may be polyvinyl butyral or ethylene-vinyl acetate.

The polymer resin may have a weight average molecular weight of 100,000 g/mol to 500,000 g/mol, 100,000 g/mol to 300,000 g/mol, or 100,000 g/mol to 200,000 g/mol.

The thickness of the elastic sheet may be 0.5 mm to 1 mm, 1 mm to 3 mm, or 3 mm to 5 mm. When the thickness of the elastic sheet is within the above range, it is possible to improve the stability of the battery by buffering the contraction and expansion occurring during charging and discharging of the battery cell.

The elastic sheet has a coefficient of thermal expansion of 0.1 ppm/°C to 0.5 ppm/°C at 0°C to 50°C, and a dynamic storage modulus of 1×10 ⁶ Pa to 3×10 ⁷ at a temperature of 20°C and a frequency of 50 Hz to 100 Hz. It can be Pa. Specifically, the elastic sheet has a coefficient of thermal expansion of 0.1 ppm/°C to 0.3 ppm/°C, or 0.15 ppm/°C to 0.3 ppm/°C at 0°C to 50°C, and at a temperature of 20°C and a frequency of 50 Hz to 100 Hz. The dynamic storage modulus may be 1 X 10 ⁶ Pa to 2 X 10 ⁷ Pa, or 1 X 10 ⁶ Pa to 5 X 10 ⁶ Pa.

The elastic sheet has a tensile strength of 10 MPa to 50 MPa, 10 MPa to 40 MPa, or 10 MPa to 30 MPa, and the elongation at break of 150% to 400%, 150% to 350%, or 200% To 300%. In addition, the elastic sheet has a thermal conductivity of 0.01 W/mK to 0.8 W/mK, 0.1 W/mK to 0.8 W/mK, 0.1 W/mK to 0.6 W/mK, or 0.1 W/mK in the surface direction and the thickness direction. To 0.5 W/mK.

The tensile strength and elongation at break may be measured by the method described in JIS K 6771. In addition, the thermal conductivity may be measured by the method described in ASTM F 433.

Since the heat dissipation sheet and the elastic sheet are bonded by heating and pressing, there may be no physical boundary between the layers. The heating and pressurization may be heated to 100°C to 150°C and pressurized to 0.1 MPa to 0.5 MPa.

According to one embodiment, the graphite sheet may be I-shaped (see FIGS. 4 and 7 ).

According to one embodiment, the graphite sheet may have at least one curved portion.

According to one embodiment, the graphite sheet may be L-shaped or U-shaped (see FIGS. 5 and 6).

Battery cell module

A battery cell module according to an embodiment includes a housing; A plurality of battery cells arranged in parallel in the housing; And a heat radiation sheet interposed between the plurality of battery cells, wherein the heat radiation sheet includes a first adhesive layer, a graphite sheet, a second adhesive layer, and an elastic sheet.

housing

The housing is for fixing a plurality of battery cells and a heat radiation sheet. For example, the housing is preferably a metal material such as aluminum or a plastic material such as PC+ABS, PA, or PP, and preferably has functions such as flame retardancy, chemical resistance, insulation, and durability, but is not limited thereto.

Battery cell

According to one embodiment, a plurality of battery cells are arranged in parallel in the housing. Specifically, since the number of battery cells is determined according to the amount of power required, a larger amount of power can be supplied as more battery cells are disposed.

The battery cell module according to the exemplary embodiment includes a graphite sheet, not a conventional metal material, and thus has a smaller volume than that of a metal material. Accordingly, since the number of installed battery cells can be increased in the same space as the conventional battery cell module, the amount of power of the battery cell module can be increased. Furthermore, compared to metal materials, it has the advantage of being light and flexible.

Heat dissipation sheet

The heat dissipation sheet is interposed between the plurality of battery cells, and includes a graphite sheet and an elastic sheet.

The description of the graphite sheet and the elastic sheet is the same as described above.

According to one embodiment, the first adhesive layer may be a single-sided or double-sided adhesive layer, and the second adhesive layer may be a double-sided adhesive layer.

According to one embodiment, the battery cell and the heat dissipation sheet may be adhered by the first adhesive layer.

According to an embodiment, the first adhesive layer may have insulating properties and heat dissipation properties. Specifically, when the first adhesive layer has insulation and heat dissipation properties, heat dissipation of the heat dissipation sheet may be improved. For example, the first adhesive layer may withstand a leakage current of 0.04 mA or less at AC 2.0 kV to 3.5 kV, but is not limited thereto.

According to one embodiment, the thermal conductivity of the heat dissipating sheet in a plane direction is 800 W/mK to 2,000 W/mK. Specifically, it may be 900 W/mK to 2,000 W/mK, 1,000 W/mK to 1,800 W/mK, 1,200 W/mK to 2,000 W/mK, or 1,200 W/mK to 1,800 W/mK.

The battery cell module according to an embodiment may further include a heat sink on at least one surface of the housing. Specifically, the battery cell module may further include a heat sink under the housing, and the heat sink sheet may be fixed to the heat sink.

The heat sink is made of a metal material such as aluminum or copper, and may have a structure in which cooling water flows, but is not limited thereto.

The battery cell module according to an embodiment may further include a heat transfer material layer between the housing and the heat sink.

The heat transfer material layer is located under the housing and is effective in transferring heat transferred from the battery cell to the lower heat sink. For example, the heat transfer material layer may include an acrylic resin, a silicone resin, or a urethane resin, and in terms of heat dissipation performance, a silicone resin is preferable, but is not limited thereto.

According to one embodiment, the heat dissipation plate may include a plurality of concave portions, and the heat dissipation sheet may be positioned in the concave portion (see FIG. 7 ). Specifically, a first adhesive layer, a graphite sheet, and a second adhesive layer of the heat dissipating sheet may be positioned in the concave portion.

The battery cell module according to an embodiment may further include a gap filler inside the housing (see FIGS. 4 to 7 ).

4 to 7 are cross-sectional views of a battery cell module according to an embodiment.

In FIG. 4, a plurality of battery cells are arranged in parallel inside the housing, an I-shaped heat dissipation sheet is interposed between the plurality of battery cells, and the heat dissipation sheet includes a first adhesive layer, a graphite sheet, a second adhesive layer, and an elastic sheet. Including, a gap filler is provided under the heat dissipation sheet and a battery cell to remove a void, and a battery cell module including a heat transfer material layer and a heat dissipation plate under the housing is illustrated.

In FIG. 5, a plurality of battery cells are arranged in parallel in the housing, an L-shaped heat dissipation sheet is interposed between the plurality of battery cells, and the heat dissipation sheet includes a first adhesive layer, a graphite sheet, a second adhesive layer, and an elastic sheet. Including, a gap filler for removing voids is provided under the elastic sheet among the heat dissipating sheets, and a battery cell module including a heat transfer material layer and a heat dissipating plate under the housing is illustrated.

6 is a plurality of battery cells arranged in parallel in the housing, a U-shaped heat radiation sheet is interposed between the plurality of battery cells, the heat radiation sheet is a first adhesive layer, a graphite sheet, a second adhesive layer and an elastic sheet Including, a gap filler for removing a void is provided under the elastic sheet of the heat dissipation sheet, and a battery cell module provided with a heat transfer material layer and a heat dissipating plate under the housing is illustrated.

7 is a plurality of battery cells arranged in parallel inside the housing, an I-shaped heat radiation sheet is interposed between the plurality of battery cells, the heat radiation sheet is a first adhesive layer, a graphite sheet, a second adhesive layer and an elastic sheet Including, wherein the heat dissipation sheet and a gap filler for removing a void is provided under the battery cell, the first adhesive layer, the graphite sheet, and the second adhesive layer of the heat dissipation sheet in a concave portion provided in the heat dissipation plate is a battery cell The module is illustrated.

Claims (18)

Elastic sheet;
A second adhesive layer provided on the elastic sheet;
A graphite sheet provided on the second adhesive layer; And
Including; a first adhesive layer provided on the graphite sheet,
The surface area of the graphite sheet is smaller than the surface area of the first adhesive layer,
The graphite sheet includes an inner layer containing graphitized fibers and an outer layer of graphite,
The laminate, wherein the elastic sheet comprises at least one vinyl-based polymer selected from the group consisting of polyvinyl butyral and ethylene-vinyl acetate. The method of claim 1,
The laminate body, wherein the surface area of the graphite sheet is smaller than that of the second adhesive layer and the elastic sheet. The method of claim 1,
The laminated body, wherein the graphite sheet is sealed by the first adhesive layer, the second adhesive layer, and the elastic sheet and is not exposed to the outside. The method of claim 1,
The first adhesive layer is a single-sided or double-sided adhesive layer, and the second adhesive layer is a double-sided adhesive layer. The method of claim 1,
The first adhesive layer and the second adhesive layer has a thickness of 0.005 mm to 0.1 mm, respectively. The method of claim 1,
The thickness of the graphite sheet is 0.5 mm to 1 mm, the laminate. The method of claim 1,
A laminate having a surface roughness (Ra) of 0.5 µm to 10 µm of the graphite sheet. The method of claim 1,
The laminated body, wherein the graphite sheet is I-shaped. The method of claim 1,
The laminated body, wherein the graphite sheet has at least one curved portion. The method of claim 9,
The laminated body, wherein the graphite sheet is L-shaped or U-shaped. housing;
A plurality of battery cells arranged in parallel in the housing; And
Including; a heat radiation sheet interposed between the plurality of battery cells,
The heat dissipation sheet includes a laminate comprising an elastic sheet, a second adhesive layer provided on the elastic sheet, a graphite sheet provided on the second adhesive layer, and a first adhesive layer provided on the graphite sheet,
The surface area of the graphite sheet is smaller than the surface area of the first adhesive layer,
The graphite sheet includes an inner layer containing graphitized fibers and an outer layer of graphite,
The battery cell module, wherein the elastic sheet comprises at least one vinyl-based polymer selected from the group consisting of polyvinyl butyral and ethylene-vinyl acetate. The method of claim 11,
The battery cell module to which the battery cell and the heat dissipation sheet are adhered by the first adhesive layer. The method of claim 11,
The battery cell module, wherein the first adhesive layer has insulating properties and heat dissipation properties. The method of claim 11,
The thermal conductivity in the surface direction of the heat dissipation sheet is 800 W/mK to 2,000 W/mK. The method of claim 11,
A battery cell module further comprising a heat sink on at least one surface of the housing. The method of claim 15,
A battery cell module further comprising a heat transfer material layer between the housing and the heat sink. The method of claim 15,
The heat dissipation plate includes a plurality of concave portions, and the heat dissipation sheet is positioned in the concave portion. The method of claim 11,
The battery cell module further comprising a gap filler inside the housing.

Images