CN209738442U - Sheet for battery pack - Google Patents
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- CN209738442U CN209738442U CN201920070553.2U CN201920070553U CN209738442U CN 209738442 U CN209738442 U CN 209738442U CN 201920070553 U CN201920070553 U CN 201920070553U CN 209738442 U CN209738442 U CN 209738442U
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Abstract
The utility model provides a sheet material for a battery pack, which comprises a low density layer, an electromagnetic shielding layer and a heat preservation layer in sequence, wherein the density of the low density layer is 0.80-1.5 g/cubic centimeter, and the thickness of the low density layer is 1-20 mm; the thickness of the electromagnetic shielding layer is 0.005-2 mm; and the density of the heat-insulating layer is 1.05-2.5 g/cubic centimeter, and the thickness of the heat-insulating layer is 0.3-3 mm. By according to the utility model discloses a battery package light in weight that the sheet was made for the battery package, good electromagnetic shielding performance and heat-proof quality have, can weaken the adverse effect of external environment temperature to the battery package, improve the heat transfer ability between battery package and the water-cooling board.
Description
Technical Field
The utility model relates to a technical field for electric automobile's battery package specifically relates to a sheet for battery package.
Background
At present, China takes new energy automobiles as one of seven strategic industries, and the market demand of China for new energy automobiles is in a development trend of spiral rising.
The power battery pack of the electric automobile is a power output source of the pure electric automobile, the cost of the power battery pack accounts for more than 40% of the cost of the whole automobile, and the importance of the power battery pack is self-evident. The casing of the battery pack serves as a carrier of the battery module, and plays a very important role in the safe operation and protection of the battery module. At present, the shell of the battery pack of the electric automobile is generally prepared from materials such as steel plates and aluminum alloys in the market. However, these materials generally have poor thermal insulation properties, and the external ambient temperature has a significant effect on the battery pack, resulting in a reduction in the heat exchange capability between the battery pack and the water-cooling plate. In addition, these materials are generally heavy, which is contrary to the requirement of light weight generally pursued in the field of electric vehicles. In addition, due to concerns about electromagnetic radiation of power batteries of electric vehicles, reducing electromagnetic radiation of power batteries is a hot spot of current widespread research.
Therefore, it is important to develop a sheet for a battery pack, which is light in weight and has excellent electromagnetic shielding performance and heat insulating performance.
SUMMERY OF THE UTILITY MODEL
In view of the above-described problems, it is an object of the present invention to provide a sheet for a battery pack, which is light in weight and has excellent electromagnetic shielding performance and heat insulating performance.
Specifically, the utility model provides a sheet for battery package, the sheet for battery package includes low density layer, electromagnetic shield layer and heat preservation in proper order, wherein the density of low density layer is 0.80-1.5 gram/cubic centimeter and thickness is 1-20 mm; the thickness of the electromagnetic shielding layer is 0.005-2 mm; and the density of the heat-insulating layer is 1.05-2.5 g/cubic centimeter, and the thickness of the heat-insulating layer is 0.3-3 mm.
According to certain preferred embodiments of the present invention, the low-density layer is composed of hollow glass microspheres as the dispersed phase and a first polymer as the continuous phase.
According to certain preferred embodiments of the present invention, the hollow glass microspheres have an average particle size in the range of 15 to 65 μm and a wall thickness in the range of 0.5 to 1.5 μm.
According to certain preferred embodiments of the present invention, the first polymer is a bulk molding compound or a sheet molding compound.
According to certain preferred embodiments of the present invention, the electromagnetic shielding layer is a metal layer.
according to certain preferred embodiments of the present invention, the metal layer is a copper layer, a nickel layer or a silver layer.
According to certain preferred embodiments of the present invention, the insulation layer is composed of glass microspheres as the dispersed phase and a second polymer as the continuous phase.
According to certain preferred embodiments of the present invention, the glass microspheres have an average particle size in the range of 15 to 65 μm.
According to certain preferred embodiments of the present invention, the second polymer is polyurethane, vulcanized silicone rubber, acrylic epoxy, polyvinyl chloride, or polymethylenephenylene isocyanate.
According to certain preferred embodiments of the present invention, the sheet for battery packs further comprises a patterned electromagnetic wave absorbing layer between the low density layer and the electromagnetic shielding layer, wherein a ratio of a total area of the patterned electromagnetic wave absorbing layer to a total area of the low density layer is in a range of 10% to 90%.
According to certain preferred embodiments of the present invention, the patterned electromagnetic wave absorbing layer includes a plurality of electromagnetic wave absorbing stripes arranged in parallel.
according to certain preferred embodiments of the present invention, the width of each electromagnetic wave absorption strip is in the range of 1mm to 50 mm; the thickness of each electromagnetic wave absorption strip is in the range of 5 μm to 100 μm; and the interval between every adjacent two electromagnetic wave absorption strips is in the range of 5mm to 200 mm.
According to certain preferred embodiments of the present invention, each of the plurality of electromagnetic wave absorption strips arranged in parallel is composed of a plurality of electromagnetic wave absorption segments arranged at intervals, wherein a length of each of the plurality of electromagnetic wave absorption segments is greater than or equal to 15 mm.
According to certain preferred embodiments of the present invention, a ratio of a total area of the patterned electromagnetic wave absorption layer to a total area of the low-density layer is in a range of 20% to 80%.
According to certain preferred embodiments of the present invention, an orthographic projection of the electromagnetic wave absorbing segment on the plane of the low-density layer is square, rectangular, oval or circular.
According to certain preferred embodiments of the present invention, the aspect ratio of the ellipse is in the range of 1 to 10.
According to certain preferred embodiments of the present invention, the patterned electromagnetic wave absorbing layer is a metal magnetic particle layer, a ferrite wave absorbing material layer, an alloy wave absorbing material layer or a ceramic wave absorbing material layer.
Compare with the electromagnetic shield sheet among the prior art, according to the utility model discloses a sheet is used to battery package's advantage lies in:
1. The weight is light, so that the total weight of the battery pack is reduced, the total weight of the electric automobile is greatly reduced, and the driving range of the electric automobile is prolonged;
2. The electromagnetic shielding performance is good, and the electromagnetic radiation of a power battery of the electric automobile can be greatly reduced; and
3. The battery pack has good heat insulation performance, can weaken the adverse effect of the external environment temperature on the battery pack, and improves the heat exchange capacity between the battery pack and the water cooling plate.
Drawings
Fig. 1 shows a cross-sectional view of a sheet for a battery pack according to an embodiment of the present invention;
Fig. 2 shows a cross-sectional view of a sheet for a battery pack according to another embodiment of the present invention;
Fig. 3 shows a transmission view of a sheet for battery packs in a direction perpendicular to a plane in which a low-density layer is located, according to an embodiment of the present invention, in which a patterned electromagnetic wave absorbing layer includes a plurality of electromagnetic wave absorbing stripes arranged in parallel;
Fig. 4 shows a transmission view of a sheet for battery packs in a direction perpendicular to a plane of a low-density layer according to another embodiment of the present invention, in which each electromagnetic wave absorption strip is composed of a plurality of electromagnetic wave absorption segments arranged at intervals, and an orthographic projection of the electromagnetic wave absorption segments on the plane of the conductive substrate is a square;
Fig. 5 shows a transmission view of a sheet for battery packs in a direction perpendicular to a plane of a low-density layer according to still another embodiment of the present invention, in which each electromagnetic wave absorption strip is composed of a plurality of electromagnetic wave absorption segments arranged at intervals, and an orthographic projection of the electromagnetic wave absorption segments on the plane of the conductive substrate is a rectangle; and
Fig. 6 shows a transmission diagram of a sheet for battery packs in a direction perpendicular to a plane in which a low-density layer is present according to still another embodiment of the present invention, in which each electromagnetic wave absorption strip is composed of a plurality of electromagnetic wave absorption segments arranged at intervals, and an orthographic projection of the electromagnetic wave absorption segments on the plane of the conductive substrate is an ellipse.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It will be appreciated that other embodiments are contemplated and may be made without departing from the scope or spirit of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense.
unless otherwise indicated, all numbers expressing feature sizes, quantities, and physical and chemical characteristics used in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the foregoing specification and attached claims are approximations that can be suitably varied by those skilled in the art in seeking to obtain the desired properties utilizing the teachings disclosed herein. The use of numerical ranges by endpoints includes all numbers within that range and any range within that range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4, and 5, and the like.
In order to enable the battery pack sheet to have light weight and good electromagnetic shielding performance and heat insulation performance, the battery pack sheet sequentially comprises a low-density layer, an electromagnetic shielding layer and a heat insulation layer, wherein the density of the low-density layer is 0.80-1.5 g/cubic centimeter, and the thickness of the low-density layer is 1-20 mm; the thickness of the electromagnetic shielding layer is 0.005-2 mm; and the density of the heat-insulating layer is 1.05-2.5 g/cubic centimeter, and the thickness of the heat-insulating layer is 0.3-3 mm.
Specifically, the sheet for a battery pack includes a low-density layer as an innermost layer for the purpose of making the sheet lightweight and thereby reducing the weight of the power battery for the purpose of range extension. The low density layer has a density of 0.80 to 1.5 g/cc, preferably 0.98 to 1.5 g/cc, more preferably 1.0 to 1.25 g/cc. By controlling the density of the low-density layer within the above range, the weight of the sheet for battery pack can be greatly reduced while ensuring the basic structural strength of the sheet for battery pack. Further, the thickness of the low-density layer is 1 to 30mm, preferably 1 to 20mm, more preferably 3 to 16 mm. There is no particular limitation on the type of material constituting the low-density layer, and the material may be appropriately selected from low-density sheets conventionally used in the art. Preferably, hollow microspheres, as commonly employed in the art, may be incorporated into the material for the purpose of reducing the density of the material layer. Preferably, the hollow microspheres are hollow glass microspheres. According to a preferred embodiment of the present invention, the low-density layer is composed of hollow glass microspheres as a dispersed phase and a first polymer as a continuous phase. The hollow glass microspheres have an average particle size in the range of 15-65 μm and a wall thickness in the range of 0.5-1.5 μm. There is no particular limitation on the specific type of first polymer that may be employed in the present invention, and preferably, the first polymer is Bulk Molding Compound (BMC) or Sheet Molding Compound (SMC). The specific type of the Bulk Molding Compound (BMC) or Sheet Molding Compound (SMC) is not particularly limited and may be a product generally available in the market at present.
In addition, in order to provide electromagnetic shielding performance to the sheet for battery pack, the sheet for battery pack includes an electromagnetic shielding layer. The thickness of the electromagnetic shielding layer is 0.005-2mm and the density is 1.5-5.0 g/cc. Preferably, the electromagnetic shielding layer is a metal layer commonly used in the art for electromagnetic shielding purposes. According to a preferred embodiment of the present invention, the metal layer is a copper layer, a nickel layer, or a silver layer.
in addition, in order to provide heat insulation performance to the sheet for battery packs to reduce adverse effects of external ambient temperature on the battery packs, thereby improving heat exchange capability between the battery packs and the water-cooling plates, the sheet for battery packs includes a heat insulation layer. The density of the heat-insulating layer is 1.05-2.5 g/cubic centimeter, and the thickness of the heat-insulating layer is 0.3-3 mm. The density and the thickness of the heat-insulating layer are controlled within the range, so that the sensitivity of the power battery in the battery pack to the temperature of the environment can be reduced, and the working state of the battery is effectively ensured. There is no particular limitation on the type of material constituting the insulating layer, and the material may be appropriately selected from insulating materials conventionally used in the art. Preferably, glass microspheres, which are commonly used in the art, may be incorporated into the material for the purpose of thermal insulation. According to a preferred embodiment of the present invention, the heat insulating layer is composed of glass microspheres as a dispersed phase and a second polymer as a continuous phase. The average particle size of the glass microspheres is in the range of 15-65 μm. There is no particular limitation on the specific type of second polymer that may be employed in the present invention, and preferably, the second polymer is a polyol component such as polyurethane, vulcanized silicone rubber, acrylic epoxy resin, polyvinyl chloride, or polymethylenephenylene isocyanate.
Fig. 1 shows a cross-sectional view of a sheet 1 for a battery pack according to an embodiment of the present invention. The sheet material 1 for the battery pack sequentially comprises a low-density layer 2, an electromagnetic shielding layer 3 and a heat insulation layer 4, wherein the density of the low-density layer 2 is 0.98-1.5 g/cubic centimeter, and the thickness of the low-density layer is 1-30 mm; the thickness of the electromagnetic shielding layer 3 is 0.005-2 mm; and the density of the heat-insulating layer 4 is 1.05-2.5 g/cubic centimeter and the thickness is 0.3-3 mm.
According to the technical scheme of the utility model, the applicant discovers unexpectedly, works as the low density layer with when further providing patterned electromagnetic wave absorbed layer between the electromagnetic shield layer, can further improve the electromagnetic shielding performance of sheet for the battery package by a wide margin, in addition, patterned electromagnetic wave absorbed layer can also be through the reflection that reduces electromagnetic noise in order to avoid electromagnetic shielding performance to descend. Therefore, according to the present invention, the sheet for battery pack further includes a patterned electromagnetic wave absorbing layer between the low-density layer and the electromagnetic shielding layer, wherein a ratio of a total area of the patterned electromagnetic wave absorbing layer to a total area of the low-density layer is in a range of 10% to 90%. According to the technical scheme of the utility model, the patterning mode to the patterning electromagnetic wave absorbed layer has carried out specific selection to realize improving electromagnetic shielding performance's purpose. Specifically, the patterned electromagnetic wave absorbing layer includes a plurality of electromagnetic wave absorbing stripes arranged in parallel, and a ratio of a total area of the patterned electromagnetic wave absorbing layer to a total area of the low-density layer (in the present invention, also referred to as "absorbing material area percentage") is in a range of 10% to 90%. Further, the width of each electromagnetic wave absorption strip is in the range of 1mm to 50 mm; the thickness of each electromagnetic wave absorption strip is in the range of 5 μm to 100 μm; and the interval between every adjacent two electromagnetic wave absorption strips is in the range of 5mm to 200 mm.
Fig. 2 shows a cross-sectional view of a battery pack sheet 1 according to another embodiment of the present invention. As shown in fig. 2, the sheet material 1 for battery pack comprises a low density layer 2, a patterned electromagnetic wave absorption layer 5, an electromagnetic shielding layer 3 and an insulating layer 4 in sequence, wherein the density of the low density layer 2 is 0.80-1.5 g/cc and the thickness is 1-20 mm; the thickness of the electromagnetic shielding layer 3 is 0.005-2 mm; and the insulating layer 4 has a density of 1.05-2.5 g/cc and a thickness of 0.3-3mm, wherein a ratio of the total area of the patterned electromagnetic wave absorbing layer 5 to the total area of the low-density layer 2 is in the range of 10% to 90%.
according to an embodiment of the present invention, the patterned electromagnetic wave absorbing layer includes a plurality of electromagnetic wave absorbing stripes arranged in parallel. Fig. 3 shows a transmission diagram of the sheet for battery pack 1 according to an embodiment of the present invention in a direction perpendicular to the plane of the low-density layer 2, in which the patterned electromagnetic wave absorbing layer 5 includes a plurality of electromagnetic wave absorbing stripes 6 arranged in parallel. In the plurality of electromagnetic wave absorption strips 6 arranged in parallel, the width W of each electromagnetic wave absorption strip 6 is in the range of 1mm to 50 mm; the thickness of each electromagnetic wave absorption strip 6 is in the range of 5 μm to 100 μm; and the interval D between every adjacent two electromagnetic wave absorption strips 6 is in the range of 5mm to 200 mm. The thickness of the electromagnetic wave absorption strip according to the present invention means the thickness of the electromagnetic wave absorption strip in the direction perpendicular to the plane of the conductive substrate.
according to certain preferred embodiments of the present invention, each of the plurality of electromagnetic wave absorption strips arranged in parallel is composed of a plurality of electromagnetic wave absorption segments arranged at intervals. Preferably, in order to improve electromagnetic shielding performance and reduce electromagnetic noise reflection, the length of each of the plurality of electromagnetic wave absorption sections is greater than or equal to 15 mm. Fig. 4 shows a transmission diagram of the sheet for battery pack 1 according to another embodiment of the present invention in a direction perpendicular to the plane of the low-density layer 2, wherein each electromagnetic wave absorption strip 6 is composed of a plurality of electromagnetic wave absorption segments 7 arranged at intervals, the length L of each electromagnetic wave absorption segment 7 is greater than or equal to 15mm, and the orthographic projection of the electromagnetic wave absorption segments 7 on the plane of the low-density layer 2 is a square. Fig. 5 shows a transmission view of the sheet for battery pack 1 according to still another embodiment of the present invention in a direction perpendicular to the plane of the low-density layer 2, wherein each electromagnetic wave absorption strip 6 is composed of a plurality of electromagnetic wave absorption segments 7 arranged at intervals, the length L of each electromagnetic wave absorption segment 7 is 15mm or more, and the orthographic projection of the electromagnetic wave absorption segment 7 on the plane of the low-density layer 2 is a rectangle. Fig. 6 shows a transmission view of a sheet for battery packs according to still another embodiment of the present invention in a direction perpendicular to the plane of the low-density layer 2, wherein each electromagnetic wave absorption strip 6 is composed of a plurality of electromagnetic wave absorption segments 7 arranged at intervals, the length L of each electromagnetic wave absorption segment 7 is 15mm or more, and the orthographic projection of the electromagnetic wave absorption segment 7 on the plane of the low-density layer 2 is an ellipse. Preferably, in order to better achieve the technical effects of the present invention, the aspect ratio of the ellipse is in the range of 1 to 10. It is to be noted that the orthographic projection of the electromagnetic wave absorbing section on the plane of the low density layer is not limited to the square, rectangle or ellipse described above, but the orthographic projection of the electromagnetic wave absorbing section on the plane of the low density layer may be other shapes such as a circle.
Preferably, a ratio of a total area of the patterned electromagnetic wave absorption layer to a total area of the low density layer is in a range of 20% to 80%. When the ratio is controlled within the above range, the electromagnetic shielding performance can be improved to the maximum extent.
Preferably, the patterned electromagnetic wave absorbing layer is a metal magnetic particle layer, a ferrite wave absorbing material layer, an alloy wave absorbing material layer or a ceramic wave absorbing material layer.
The sheet for battery packs according to the present invention can be prepared by a multi-layer material compounding method generally employed in the art.
Specifically, a lightweight low-density sheet material having a density in the range of 0.98 to 1.5 g/cc and a weight reduction of 20 to 50% for the same area of the sheet material can be obtained without changing the mechanical strength thereof by mixing a first polymer (e.g., a Sheet Molding Compound (SMC) or Bulk Molding Compound (BMC) having a density in the range of 1.9 to 2.5 g/cc) with high-strength, low-density hollow glass microspheres (e.g., 3M type im16K hollow glass microspheres).
Then, a metal with a certain thickness, such as metallic copper, metallic nickel, metallic silver and the like, is plated on the surface of the low-density sheet material by using a dry method (the dry method mainly comprises physical vapor deposition, chemical vapor deposition and the like) or a wet method (the wet method mainly comprises physical or chemical means such as chemical plating, electroplating, chemical reduction and the like), so that the surface of the low-density sheet material presents the electromagnetic shielding property of the metal, and the electromagnetic shielding layer is formed. The thickness of the metal electromagnetic shielding layer is 0.001mm-0.1 mm. Alternatively, a thin metal sheet (e.g., copper foil, aluminum foil, etc. having a thickness of 0.1mm to 1 mm) may be applied on the low-density plate material to form the electromagnetic shielding layer.
Then, an insulating layer was laminated on the electromagnetic shielding layer to obtain the sheet for battery pack. The insulation layer may be prepared by mixing and curing glass microspheres and a second polymer.
regarding the technical scheme that the battery pack sheet further includes a patterned electromagnetic wave absorption layer between the low density layer and the electromagnetic wave absorption layer, after preparing the low density sheet, an electromagnetic wave absorption coating is coated on the low density sheet in a patterned form by a conventional coating method to obtain the patterned electromagnetic wave absorption layer, and then a metallic electromagnetic wave absorption layer and a heat insulation layer are sequentially prepared on the patterned electromagnetic wave absorption layer according to the method as described above. Alternatively, an electromagnetic wave absorption coating material may be applied in a patterned form on a surface of a thin metal sheet (e.g., a copper foil having a thickness of 0.1mm to 1mm, an aluminum foil, etc.) to obtain a patterned electromagnetic wave absorption layer, and then the thin metal sheet having the patterned electromagnetic wave absorption layer is attached to a low-density board, wherein the patterned electromagnetic wave absorption layer is located between the thin metal sheet and the low-density board.
There is no particular limitation on the specific type of electromagnetic wave-absorbing coating that can be used in the present invention, which may be a common coating material commonly used in the art for electromagnetic shielding, including metal magnetic particles (e.g., carbonyl iron powder cip), ferrite-based wave-absorbing materials (e.g., nickel zinc ferrite, manganese zinc ferrite, and barium ferrite), alloy-based wave-absorbing materials (e.g., iron silicon aluminum), and ceramic-based wave-absorbing materials (e.g., silicon carbide and aluminum borosilicate). Preferably, the electromagnetic wave absorbing paint contains carbonyl iron powder. In order to facilitate uniform distribution and strong adhesion of carbonyl iron powder on the low-density layer, it is common to disperse carbonyl iron powder in liquid silicone oil and use the resulting mixture as a coating material.
The specific coating method of the patterned electromagnetic wave absorbing layer is not particularly limited. Typically, the thickness of each stripe is controlled by a wire wound rod or a metered blade, the width of each stripe is controlled by the flow rate and line speed of the coating material, and furthermore, the width between the stripes is controlled by the gap between the runners in the coating material delivery device during the coating process.
It will be apparent to those skilled in the art that various changes and modifications can be made in the present disclosure without departing from the spirit and scope of the disclosure. Thus, if such modifications and variations of the present disclosure fall within the scope of the claims of the present invention and their equivalents, the present disclosure is also intended to encompass such modifications and variations.
Claims (17)
1. The sheet for the battery pack is characterized by comprising a low-density layer, an electromagnetic shielding layer and a heat insulation layer in sequence, wherein the density of the low-density layer is 0.80-1.5 g/cubic centimeter, and the thickness of the low-density layer is 1-20 mm; the thickness of the electromagnetic shielding layer is 0.005-2 mm; and the density of the heat-insulating layer is 1.05-2.5 g/cubic centimeter, and the thickness of the heat-insulating layer is 0.3-3 mm.
2. The battery pack sheet of claim 1, wherein the low density layer is comprised of hollow glass microspheres as the dispersed phase and a first polymer as the continuous phase.
3. The battery pack sheet according to claim 2, wherein the hollow glass microspheres have an average particle diameter in the range of 15 to 65 μm and a wall thickness in the range of 0.5 to 1.5 μm.
4. The battery pack sheet of claim 2, wherein the first polymer is a bulk molding compound or a sheet molding compound.
5. The battery pack sheet according to claim 1, wherein the electromagnetic shielding layer is a metal layer.
6. The battery pack sheet according to claim 5, wherein the metal layer is a copper layer, a nickel layer, or a silver layer.
7. The battery pack sheet of claim 1, wherein the insulating layer is comprised of glass microspheres as the dispersed phase and a second polymer as the continuous phase.
8. The battery pack sheet according to claim 7, wherein the glass microspheres have an average particle diameter in the range of 15 to 65 μm.
9. The battery pack sheet according to claim 7, wherein the second polymer is polyurethane, vulcanized silicone rubber, acrylic epoxy resin, polyvinyl chloride, or polymethylenephenylene isocyanate.
10. The sheet for battery packs according to claim 1, wherein the sheet for battery packs further comprises a patterned electromagnetic wave absorbing layer between the low density layer and the electromagnetic shielding layer, wherein a ratio of a total area of the patterned electromagnetic wave absorbing layer to a total area of the low density layer is in a range of 10% to 90%.
11. the sheet for battery packs according to claim 10, wherein the patterned electromagnetic wave-absorbing layer comprises a plurality of electromagnetic wave-absorbing stripes arranged in parallel.
12. The battery pack sheet according to claim 11, wherein the width of each electromagnetic wave absorption strip is in the range of 1mm to 50 mm; the thickness of each electromagnetic wave absorption strip is in the range of 5 μm to 100 μm; and the interval between every adjacent two electromagnetic wave absorption strips is in the range of 5mm to 200 mm.
13. The battery pack sheet according to claim 11, wherein each of the plurality of electromagnetic wave absorption strips arranged in parallel is composed of a plurality of electromagnetic wave absorption segments arranged at intervals, wherein a length of each of the plurality of electromagnetic wave absorption segments is greater than or equal to 15 mm.
14. The sheet for battery packs according to claim 10, wherein a ratio of a total area of the patterned electromagnetic wave absorbing layer to a total area of the low-density layer is in a range of 20% to 80%.
15. The sheet for battery packs according to claim 13, wherein an orthogonal projection of the electromagnetic wave absorbing segment on the plane of the low density layer is a square, a rectangle, an ellipse, or a circle.
16. The battery pack sheet according to claim 15, wherein the aspect ratio of the ellipse shape is in the range of 1 to 10.
17. The battery pack sheet according to claim 10, wherein the patterned electromagnetic wave absorbing layer is a metal magnetic particle layer, a ferrite-based wave absorbing material layer, an alloy-based wave absorbing material layer, or a ceramic-based wave absorbing material layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920070553.2U CN209738442U (en) | 2019-01-16 | 2019-01-16 | Sheet for battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920070553.2U CN209738442U (en) | 2019-01-16 | 2019-01-16 | Sheet for battery pack |
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| Publication Number | Publication Date |
|---|---|
| CN209738442U true CN209738442U (en) | 2019-12-06 |
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| CN201920070553.2U Active CN209738442U (en) | 2019-01-16 | 2019-01-16 | Sheet for battery pack |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116655384A (en) * | 2023-06-07 | 2023-08-29 | 徐州工程学院 | High Wen Gaoshang-resistant wave-absorbing ceramic and preparation method and application thereof |
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2019
- 2019-01-16 CN CN201920070553.2U patent/CN209738442U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116655384A (en) * | 2023-06-07 | 2023-08-29 | 徐州工程学院 | High Wen Gaoshang-resistant wave-absorbing ceramic and preparation method and application thereof |
| CN116655384B (en) * | 2023-06-07 | 2023-12-12 | 徐州工程学院 | High Wen Gaoshang-resistant wave-absorbing ceramic and preparation method and application thereof |
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