A Mylar sheet with high thermal conductivity and easy energy storage for batteries

Abstract

The present invention discloses a Mylar sheet specially designed for easy-to-storage energy batteries with high thermal conductivity. The Mylar sheet comprises a Mylar layer, a first thermally conductive layer, and a second thermally conductive layer, wherein the first thermally conductive layer and the second thermally conductive layer are arranged inside the Mylar layer, and the first thermally conductive layer and the second thermally conductive layer are arranged at intervals. The Mylar layer comprises a Mylar body and a Mylar cover, wherein the Mylar body is hollow and has no cover, the Mylar cover is provided with a plurality of through holes, the bottom of the Mylar body is provided with a through hole, the Mylar cover is embedded in the Mylar body, and the Mylar cover is used to place batteries. Compared with the prior art, the present invention designs the Mylar sheet to be a hollow structure, so that a heat-conducting and heat-dissipating structure can be placed inside the Mylar sheet, so that the heat-conducting and heat-dissipating structure partially contacts the battery to conduct and dissipate heat from the battery, and contacts are further provided on the outer side of the heat-conducting structure, so that a certain gap is formed between the battery and the surface of the Mylar sheet, thereby avoiding the situation where the battery and the Mylar sheet are in contact with each other, resulting in a decrease in the heat dissipation performance of the battery.

Description

Technical Field

[0001] The invention relates to a Mylar sheet specially used for energy storage batteries with high thermal conductivity. Background Art

[0002] Mylar sheet (MYLAR sheet) PET polyester film is made by heating dimethyl terephthalate and ethylene glycol with the assistance of relevant catalysts, undergoing ester exchange and vacuum polycondensation, and biaxial stretching.

[0003] Mylar sheets are available in a variety of colors, including cream white, black, natural, and transparent. They are made from a variety of materials, including PET, PVC, PC, and fire-resistant Mylar sheets. They are also categorized by application into insulation, cushioning, wear-resistant, sealing, and decorative types. Mylar sheets offer dimensionally stable, flat construction, excellent tear strength, and resistance to heat, cold, moisture, water, and chemical corrosion. They also possess superior insulation properties and excellent electrical, mechanical, heat, and chemical resistance.

[0004] Mylar sheets can be used as insulation for motors, capacitors, coils, and cables, and can also be made into composite insulation materials with highland barley paper. They are widely used in the electrical insulation industry, serving as gaskets, screens, and protective materials for electronics, household appliances, instruments, displays, motor slots, computers, and peripheral equipment.

[0005] Nowadays, Mylar sheets are often used to wrap batteries to protect and insulate them, preventing them from affecting other electrical components during operation. However, the existing technology only allows Mylar sheets to play such a limited role. When the battery is charging or discharging, heat is generated. When the heat accumulates to a certain level, it will affect the electrical components and damage the battery components. Mylar sheets are wrapped around the outside of the battery components. Since Mylar sheets do not have the functions of heat dissipation and thermal conductivity, they will affect the heat dissipation performance of the battery, and in severe cases, the battery may be damaged. Therefore, a Mylar sheet for batteries with thermal conductivity and heat dissipation performance is needed. Summary of the Invention

[0006] The purpose of the present invention is to solve the above deficiencies in the prior art and provide a Mylar sheet with high thermal conductivity and easy energy storage battery.

[0007] A Mylar sheet with high thermal conductivity and special for easy-to-storage energy batteries includes a main body, characterized in that the main body includes a Mylar layer, a first heat-conducting layer and a second heat-conducting layer, the first heat-conducting layer and the second heat-conducting layer are arranged inside the Mylar layer, and the first heat-conducting layer and the second heat-conducting layer are placed at intervals.

[0008] In order to set the heat conductive layer inside the Mylar sheet, the Mylar layer includes a Mylar body and a Mylar cover. The Mylar body is hollow without a cover. The Mylar cover is provided with multiple through holes. The bottom of the Mylar body is provided with a through hole. The Mylar cover is embedded in the Mylar body. The Mylar cover is used to place batteries.

[0009] The first heat-conducting layer includes a first conductor and a hydrogel film, and the second heat-conducting layer includes a second conductor and a hydrogel film, wherein the first conductor and the second conductor have different thermal conductivity properties;

[0010] In order to conduct heat away from the battery and reduce heat, the first and second heat-conducting layers each include an inner side and an outer side. The inner side is provided with a hydrogel film, and the outer side is provided with multiple contacts. The first heat-conducting layer contacts the second heat-conducting layer, and the contacts pass through the through holes of the Mylar cover and connect to the battery. The bottom of the second heat-conducting layer is connected to a wire, and the wire is used to connect to the battery.

[0011] The contacts pass through the through holes on the Mylar cover to support the battery, so that there is a certain gap between the battery and the surface of the Mylar cover, thereby preventing the battery from being closely attached to the Mylar cover, thereby affecting the heat dissipation of the battery.

[0012] In order to enable the thermal conductive layer to have a heat dissipation function, the first conductor is copper foil, the second conductor is silver foil, the copper foil is connected end to end to form a closed roll structure, and the silver foil is connected end to end to form a closed roll structure. A hydrogel film is provided on the inside of the silver foil roll and the copper foil roll.

[0013] In order to ensure the heat dissipation function of the hydrogel film, the hydrogel film includes a carrier, a hydrogel and a phase change material. One side of the carrier is connected to one side of the hydrogel, and the other side of the hydrogel is connected to one side of the phase change material.

[0014] In order to prevent heat dissipation, an insulating layer is also included. The insulating layer is connected to the other side of the phase change material and is made of polyimide or silica gel.

[0015] The working principle of the present invention is as follows: considering that the Mylar sheet is an insulator and does not have the function of heat conduction and heat dissipation, the present invention adds a structure that can conduct and dissipate heat to enable it to perform the function of heat conduction and heat dissipation.

[0016] The present invention designs the Mylar sheet to be hollow, allowing for placement of heat-conducting and heat-dissipating structures within the sheet. These structures are in contact with the battery, conducting and dissipating heat from the battery. Furthermore, contacts are provided on the outside of the heat-conducting structure, passing through the Mylar cover and contacting the battery. The contacts are at a height relative to the Mylar cover surface, creating a gap between the battery and the Mylar sheet surface. This prevents the battery from being in contact with the Mylar sheet, which could result in reduced heat dissipation performance.

[0017] The present invention uses a hydrogel film as a heat dissipation structure and installs it inside the conductor, reducing the required space. The conductor transfers heat to itself, while the hydrogel as a heat dissipation structure absorbs heat, lowering the temperature of the conductor and keeping it within a safe range. During charging or discharging, the battery generates heat, which is introduced into the conductor. The hydrogel layer can evaporate water and carry away a large amount of heat, thereby lowering the operating temperature of the heating element. The hydrogel layer can absorb moisture from the air at low temperatures to store water, and at the same time, cooperate with the phase change material layer to absorb and store heat, which can further reduce the operating temperature of the heating element.

[0018] At the same time, the present invention utilizes the first hot spot effect, namely the Seebeck effect, which is as follows: if two different conductors are connected to form a closed loop and there is a temperature difference at the two junctions, a so-called thermoelectric potential will be generated in the loop. The loop formed in this way is called a thermocouple or thermocouple. The current generated by the connection between the two ends is called thermoelectric current (formerly known as thermal current). In the thermoelectric phenomenon, the properties of metals (or semiconductors) can be arranged into a sequence, called a thermoelectric series (formerly known as a thermoelectric series). When two metals are randomly selected from the sequence to make a thermoelectric element, the current at the node with the higher temperature flows from the metal at the front of the sequence to the metal at the back of the sequence. The thermoelectric series of several common metals are as follows:

[0019] Bismuth - Nickel - Cobalt - Potassium - Rubidium - Calcium - Palladium - Sodium - Mercury - Platinum - Tantalum - Aluminum - Manganese - Lead - Tin - Cesium - Tungsten - Thallium - Indium - Iridium - Silver - Rhenium - Copper - Gold - Cadmium - Zinc - Molybdenum - Cerium - Lithium - Iron - Antimony - Germanium - Tellurium - Selenium;

[0020] The present invention selects copper and silver as conductors. When the battery emits heat, a temperature difference will be generated between the two conductors due to their different thermal conductivity. At the same time, since the copper and silver are in contact with each other to form a loop, current will be generated between the copper and silver. The current will flow from the copper to the silver. The silver is connected to the battery through a wire, which can charge the battery and play a role in energy storage.

[0021] Beneficial effects:

[0022] Compared with the prior art, the present invention designs the Mylar sheet into a hollow structure, allowing for placement of heat-conducting and heat-dissipating structures within it. These structures are in contact with the battery, conducting and dissipating heat from the battery. Furthermore, contacts are provided on the outside of the heat-conducting structure, passing through the Mylar cover and contacting the battery. The contacts are at a height relative to the Mylar cover surface, creating a gap between the battery and the Mylar sheet surface. This prevents the battery from coming into contact with the Mylar sheet, which could degrade the battery's heat dissipation performance.

[0023] The present invention uses a hydrogel film as a heat dissipation structure and installs it inside the conductor, reducing the required space. The conductor transfers heat to itself, while the hydrogel as a heat dissipation structure absorbs heat, lowering the temperature of the conductor and keeping it within a safe range. During charging or discharging, the battery generates heat, which is introduced into the conductor. The hydrogel layer can evaporate water and carry away a large amount of heat, thereby lowering the operating temperature of the heating element. The hydrogel layer can absorb moisture from the air at low temperatures to store water, and at the same time, cooperate with the phase change material layer to absorb and store heat, which can further reduce the operating temperature of the heating element.

[0024] At the same time, the present invention utilizes the first hot spot effect, namely the Seebeck effect. The present invention selects copper and silver as conductors. When the battery emits heat, the two conductors will produce a temperature difference due to their different thermal conductivity. At the same time, since the copper and silver are in contact with each other to form a loop, current will be generated between the copper and silver. The current will flow from the copper to the silver. By connecting the silver to the battery through a wire, the battery can be charged and play a role in energy storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of a Mylar sheet with high thermal conductivity and easy energy storage battery;

[0026] Figure 2 This is a left view of a Mylar sheet with high thermal conductivity and special for energy storage batteries;

[0027] Figure 3 is a schematic diagram of the first heat conducting layer;

[0028] Figure 4 is a schematic diagram of the second heat conducting layer;

[0029] In the figure, 1, Mylar cover, 2, contact, 3, Mylar body, 4, first conductor, 5, hydrogel film, 6, second conductor. DETAILED DESCRIPTION

[0030] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0031] like Figure 1-4 As shown, the Mylar cover 1, the contact 2, the Mylar body 3, the first conductor 4, the hydrogel film 5, and the second conductor 6;

[0032] A Mylar sheet with high thermal conductivity and special for easy-to-storage energy batteries includes a main body, characterized in that the main body includes a Mylar layer, a first heat-conducting layer and a second heat-conducting layer, the first heat-conducting layer and the second heat-conducting layer are arranged inside the Mylar layer, and the first heat-conducting layer and the second heat-conducting layer are placed at intervals.

[0033] In this embodiment, the Mylar layer includes a Mylar body 3 and a Mylar cover 1. The Mylar body 3 is hollow without a cover. The Mylar cover 1 is provided with multiple through holes. The bottom of the Mylar body 3 is provided with a through hole. The Mylar cover 1 is embedded in the Mylar body 3. The Mylar cover 1 is used to place batteries.

[0034] In this embodiment, the first heat-conducting layer includes a first conductor 4 and a hydrogel film 5, and the second heat-conducting layer includes a second conductor 6 and a hydrogel film 5. The first conductor 4 and the second conductor 6 have different thermal conductivity properties.

[0035] The first heat-conducting layer and the second heat-conducting layer both include an inner side and an outer side, the inner side is provided with a hydrogel film 5, and the outer side is provided with a plurality of contacts 2. The first heat-conducting layer contacts the second heat-conducting layer, and the contacts 2 pass through the through holes of the Mylar cover 1 and are connected to the battery. A wire is connected to the bottom of the second heat-conducting layer, and the wire is used to connect to the battery.

[0036] In this embodiment, the first conductor 4 is copper foil, and the second conductor 6 is silver foil. The copper foil is connected end to end to form a closed roll structure, and the silver foil is connected end to end to form a closed roll structure. A hydrogel film 5 is provided on the inside of the silver foil roll and the copper foil roll.

[0037] In this embodiment, the hydrogel film 5 includes a carrier, a hydrogel and a phase change material. One side of the carrier is connected to one side of the hydrogel, and the other side of the hydrogel is connected to one side of the phase change material.

[0038] In this embodiment, an insulating layer is further included, and the insulating layer is connected to the other side of the phase change material.

[0039] In this embodiment, the insulating layer is made of polyimide or silicone.

[0040] Usage: Copper foil and silver foil are connected end to end to form a roll, and a hydrogel film 5 is placed inside the copper foil roll and the silver foil roll to form a first heat-conducting layer and a second heat-conducting layer, and the first heat-conducting layer is in contact with the second heat-conducting layer. The first heat-conducting layer and the second heat-conducting layer are placed in a Mylar body 3 with an interval, and the Mylar cover 1 is covered. The contacts 2 on the first heat-conducting layer and the second heat-conducting layer pass through the through holes on the Mylar cover 1 and contact the battery. At this time, there is a certain gap between the Mylar sheet and the battery. At the same time, the wire at the bottom of the silver foil is connected to the battery.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A Mylar sheet with high thermal conductivity and easy energy storage battery, comprising a main body, characterized in that: The main body includes a Mylar layer, a first heat-conducting layer and a second heat-conducting layer, wherein the first heat-conducting layer and the second heat-conducting layer are arranged inside the Mylar layer; The Mylar layer includes a Mylar body and a Mylar cover. The Mylar body is hollow without a cover. The Mylar cover is provided with a plurality of through holes. The bottom of the Mylar body is provided with a through hole. The Mylar cover is embedded in the Mylar body. The Mylar cover is used to place batteries. The first heat-conducting layer includes a first conductor and a hydrogel film, and the second heat-conducting layer includes a second conductor and a hydrogel film, wherein the first conductor and the second conductor have different thermal conductivity properties; The first heat-conducting layer and the second heat-conducting layer each include an inner side and an outer side, the inner side is provided with a hydrogel film, and the outer side is provided with a plurality of contacts. The first heat-conducting layer and the second heat-conducting layer are in contact with each other to form a loop, and the contacts pass through the through holes of the Mylar cover and are connected to the battery. The bottom of the second heat-conducting layer is connected to a wire, and the wire is used to connect to the battery. The first conductor is copper foil, the second conductor is silver foil, the copper foil is connected end to end to form a closed roll structure, the silver foil is connected end to end to form a closed roll structure, and a hydrogel film is provided on the inner side of the silver foil roll and the copper foil roll.

2. The Mylar sheet with high thermal conductivity and easy energy storage battery according to claim 1, characterized in that: The hydrogel film comprises a carrier, a hydrogel and a phase change material. One side of the carrier is connected to one side of the hydrogel, and the other side of the hydrogel is connected to one side of the phase change material.

3. The high thermal conductivity Mylar sheet for energy storage batteries according to claim 2, characterized in that: It also includes an insulating layer, which is connected to the other side of the phase change material.

4. The high thermal conductivity Mylar sheet for energy storage batteries according to claim 3, characterized in that: The insulating layer is made of polyimide or silica gel.

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