Heat insulation structure, battery and electric device

Abstract

The utility model discloses a heat insulation structure, battery and electric device, heat insulation structure includes encapsulation film, heat conduction protective film and phase change material, encapsulation film is provided with the accommodation cavity, phase change material and heat conduction protective film are both encapsulated in the accommodation cavity, heat conduction protective film wraps phase change material. According to the utility model, the phase-change material and the aerogel are compounded, combined with the heat-conducting protective film and then wrapped in the packaging film to form a new heat-insulating structure, the heat-insulating structure is applied between the single cells, when the single cells are subjected to thermal runaway, the phase-change material absorbs heat to change the state and is converted from a solid state to a liquid state and a gas state, and in the process of changing the state of the phase-change material, the heat-conducting protective film covers the heat-conducting protective film. After a certain temperature is maintained for a long time, longer-time liquid cooling can be provided for a battery cooling system, the temperature of a thermal runaway battery cell is further reduced, and when the temperature of the thermal runaway battery cell is reduced to a safe temperature, the temperature difference between the thermal runaway battery cell and an adjacent battery cell is reduced, so that thermal runaway cannot be caused to the adjacent battery cell; and the thermal runaway battery cell is prevented from conducting heat to the adjacent battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a heat insulation structure, a battery and an electrical device. Background Art

[0002] With the rapid iterative development of the new energy vehicle industry, the frequency of fire accidents involving new energy vehicles has increased, causing serious impacts on the personal and property safety of consumers. Therefore, new energy vehicle companies and consumers have put forward higher challenges to the safety of new energy vehicles.

[0003] To meet battery thermal safety requirements, thermal insulation treatment is required between individual cells in the battery. In the prior art, foam, fiber materials, or aerogel are typically used to separate individual cells to prevent heat transfer between them. However, thermal insulation structures formed by materials such as foam, fiber, and aerogel can only delay heat transfer when a single cell experiences thermal runaway, but cannot effectively transfer or absorb heat, and still cannot prevent the chain reaction of thermal runaway in other cells.

[0004] To this end, the present application aims to propose a new type of thermal insulation structure, battery and electrical device to solve the above problems. Utility Model Content

[0005] The main purpose of the present invention is to provide a heat insulation structure, a battery and an electrical device, aiming to solve the technical problem in the prior art that the heat insulation structure between battery cells cannot transfer or absorb the heat generated when a single battery cell has thermal runaway.

[0006] In order to achieve the above-mentioned purpose of the utility model, the utility model proposes a thermal insulation structure on the one hand, including a packaging film, a thermal conductive protective film and a phase change material, the packaging film is provided with a accommodating cavity, the phase change material and the thermal conductive protective film are both encapsulated in the accommodating cavity, and the thermal conductive protective film wraps the phase change material.

[0007] Furthermore, the phase change material is formed by compounding a heat-insulating substrate and a solid hydrate, and the heat-insulating substrate is a supporting carrier of the solid hydrate.

[0008] Furthermore, the solid hydrate is one or more combinations of crystalline, amorphous oxide materials or salt materials rich in crystalline water.

[0009] Furthermore, the thermal insulation substrate is an aerogel material.

[0010] Furthermore, the thermally conductive protective film is a metal sheet.

[0011] Furthermore, the packaging film is a pressure-resistant flexible insulating film.

[0012] Furthermore, the packaging film is concave in the middle, and has packaging edges formed around it. The packaging edges of the two packaging films cover and seal each other to form a receiving cavity for wrapping the thermal conductive protective film and the phase change material.

[0013] Furthermore, the four corners of the heat-conducting protective film and the phase change material are rounded, and the rounded corners are used to avoid damaging the packaging film during the assembly process.

[0014] In order to achieve the above-mentioned purpose of the utility model, the second aspect of the utility model provides a battery, comprising any one of the above-mentioned thermal insulation structures.

[0015] In order to achieve the above-mentioned purpose of the utility model, the third aspect of the utility model provides an electrical device, including the above-mentioned battery.

[0016] Beneficial effects:

[0017] Compared with the prior art, a heat-insulating structure in an embodiment of the present application includes a packaging film, a heat-conducting protective film and a phase-change material. The packaging film is provided with a receiving cavity, and the phase-change material and the heat-conducting protective film are both encapsulated in the receiving cavity, and the heat-conducting protective film wraps the phase-change material. This technical solution compounds the phase-change material with traditional aerogel and combines it with a heat-conducting protective film, and then wraps it in the packaging film to form a new heat-insulating structure, which is applied between single-cell cores. When a single-cell battery cell experiences thermal runaway, the phase-change material absorbs heat and changes its own state, from solid to liquid and gas. In the process of the phase-change material changing its own state, it maintains a certain temperature for a long time, which can provide a longer period of liquid cooling for the battery cooling system, further reducing the temperature of the thermal runaway battery cell. When the temperature of the thermal runaway battery cell drops to a safe temperature, the temperature difference between it and the adjacent battery cell is reduced, which is not enough to cause thermal runaway to the adjacent battery cell, thereby protecting the thermal runaway battery cell from heat conduction to the adjacent battery cell.

[0018] Compared with the prior art, a battery according to an embodiment of the present application includes any of the above-mentioned thermal insulation structures. It is understood that the battery according to the present application can include all the technical features and technical effects of the above-mentioned thermal insulation structures, which will not be described in detail here.

[0019] Compared to the prior art, an electrical device according to an embodiment of the present application includes any of the batteries described above. It is understood that the electrical device of the present application can include the aforementioned batteries. It is understood that the electrical device of the present application can include all the technical features and technical effects of the aforementioned batteries, which will not be further elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional schematic diagram of a heat insulation structure according to an embodiment of the present invention;

[0021] Figure 2This is an exploded schematic diagram of a heat insulation structure according to an embodiment of the present invention;

[0022] Figure 3 This is a three-dimensional schematic diagram of a phase change material according to an embodiment of the present invention;

[0023] Figure 4 This is a three-dimensional schematic diagram of a packaging film according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the temperature test site of the thermal insulation structure of one embodiment of the present utility model;

[0025] Figure 6 This is a time and temperature line graph of the T4 insulation interval when the solid phase change material is 2 mm thick;

[0026] Figure 7 This is a time and temperature line graph of the T4 insulation interval when the solid phase change material is 3 mm thick;

[0027] Figure 8 This is a time and temperature line graph of the T4 insulation interval when the aerogel is 3 mm thick;

[0028] Figure 9 This is a time and voltage line graph of the T4 insulation interval when the solid phase change material is 2 mm thick;

[0029] Figure 10 This is a time and voltage line graph of the T4 insulation interval when the solid phase change material is 3 mm thick;

[0030] Figure 11 This is a line graph of time and voltage in the T4 insulation interval when the aerogel is 3 mm thick.

[0031] in:

[0032] 1. Packaging film; 10. Packaging edge; 11. Accommodating cavity;

[0033] 2. Thermal conductive protective film;

[0034] 3. Phase change material; 31. Chamfer; 32. Solid hydrate; 33. Thermal insulation substrate;

[0035] 40. Clamp; 41. Aerogel; 42. Heating plate; 43. Single cell; 44. Thermal insulation structure.

[0036] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] The monomer cell mainly includes a positive electrode tab, a negative electrode tab, an electrolyte, a separator and a shell. Exemplarily, the positive electrode tab and the negative electrode tab of the monomer cell are respectively arranged at both ends of the cell and extend out of the shell to connect to the external circuit. Inside the monomer cell, the positive electrode tab and the negative electrode tab are connected to the current collector (such as aluminum foil, copper foil) inside the cell to facilitate connection with the internal circuit, thereby achieving the purpose of drawing the current to the outside of the shell. During the charge and discharge process of the monomer cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent direct contact between the positive electrode and the negative electrode, play a role in preventing the positive electrode and the negative electrode from short-circuiting, and allow active ions to pass through. The electrolyte plays a role in conducting active ions between the positive electrode and the negative electrode. This application does not specifically limit the type of electrolyte, and can be selected according to actual application scenarios and needs.

[0042] When single cells are used in electric vehicles, due to the limited voltage and capacity of single cells, it is usually necessary to arrange single cells with parameters such as capacity, voltage, and internal resistance as consistent as possible in series or parallel and group them to form battery modules that meet actual needs. In actual application, in order to meet the relevant requirements of battery thermal safety, such as the requirement in GB38031-2020 that after a battery cell thermal runaway occurs, the battery system will not catch fire or explode within 5 minutes, such as the NTP (No Thermal Propagation) standard, which means that after a single cell in the battery thermal runaway occurs, the failed single cell is not allowed to cause thermal runaway of other single cells. It is usually necessary to perform thermal insulation treatment between the single cells in the battery.

[0043] However, the inventors discovered that in actual battery production processes, individual cells are typically separated by foam, fiber materials, or aerogel to prevent heat transfer between the individual cells. However, after repeated practice, they found that the thermal insulation structures formed by materials such as foam, fiber, and aerogel can only delay heat transfer during thermal runaway of a single cell, but cannot effectively transfer or absorb heat. This still cannot prevent the chain reaction of thermal runaway in other cells, making it difficult to meet the NTP standard.

[0044] In order to solve the technical problem that the thermal insulation structure between the above-mentioned battery cells cannot transfer or absorb the heat generated when the single battery cell goes into thermal runaway, the embodiment of the present application provides a thermal insulation structure that can effectively prevent the thermal runaway single battery cell from causing thermal runaway of other single battery cells. The following will describe the thermal insulation structure in the embodiment of the present application in detail with reference to the accompanying drawings.

[0045] See also Figure 1 and Figure 4In the embodiment, the application provides a heat insulation structure 44, comprising: an encapsulation film 1, a heat conduction protection film 2 and a phase change material 3, the encapsulation film 1 is provided with a containing cavity 11, the phase change material 3 and the heat conduction protection film 2 are both encapsulated in the containing cavity 11, and the phase change material 3 is arranged between the two heat conduction protection films 2.

[0046] In the embodiment, the encapsulation film 1 is a flexible insulation material of pressure-resistant type, which has the characteristics of high insulation strength, strong pressure resistance, high flexibility and easy encapsulation. The encapsulation film 1 is used to wrap the heat conduction protection film 2 and the phase change material 3, and plays a protective role. Exemplarily, the encapsulation film 1 can be an aluminum plastic shell, PP (Polypropylene), PET (Polyethyleneterephthalate) and PI (Polyimide) and the like. The heat conduction protection film 2 is a metal sheet, which is used for impact protection and can uniformly conduct heat after thermal runaway of the battery cell. Exemplarily, the metal sheet can be aluminum alloy, iron, copper and the like. It can be understood that the thickness of the metal sheet is not specifically limited in the application, which can be adjusted according to the actual application scene. For example, when the battery system is a lithium-iron system, a sodium battery system or the like, a battery system with less power can use aluminum or aluminum alloy with lower temperature resistance and thinner thickness, and when the battery system is a ternary system, a lithium cobaltate system or a lithium-rich system, a battery system with higher energy can use iron, copper or iron alloy with slightly thicker thickness and stronger temperature resistance.

[0047] Further, the heat conduction protection film 2 and the phase change material 3 are arranged along the large surface of the single battery cell 43, so that the phase change material 3 can uniformly bear the heat conduction from the thermal runaway battery cell.

[0048] In the above embodiment, the application adds the phase change material 3 to the traditional heat insulation protection material, and the phase change material 3 is combined with the traditional aerogel 41 and the heat conduction protection film 2 to form a new heat insulation structure 44 wrapped in the encapsulation film 1. It can be understood that the phase change material 3 can be converted from solid to liquid and then to gas after absorbing heat, and in this process, compared with the traditional aerogel 41 insulation, the application adds the heat absorption and latent heat stages, greatly increases the heat spread time between the single battery cells 43 when the battery cell is in thermal spread, and further realizes that the adjacent battery cells do not occur thermal spread when one of the battery cells occurs thermal runaway.

[0049] In the above embodiment, it can be understood that when a single cell 43 experiences thermal runaway, the phase change material 3 absorbs heat and reduces the temperature of the thermal runaway cell by absorbing heat through the change from solid to liquid. Furthermore, during the continuous cooling process, the change from liquid to gas can absorb more heat and further reduce the temperature of the thermal runaway cell. Among them, the phase change material 3 can maintain the phase change material 3 for a longer time during the transition from liquid to gas, which can provide the battery cooling system with a longer period of liquid cooling and further reduce the temperature of the thermal runaway cell. When the temperature of the thermal runaway cell is reduced to a safe temperature, the temperature difference between the thermal runaway cell and the adjacent cell is reduced, and the energy of the thermal runaway cell is insufficient to pose a threat to the adjacent cell, thermal runaway is achieved between the cells without spreading.

[0050] See also Figures 1 to 4 In one embodiment, the phase change material 3 is formed by combining a heat-insulating substrate 33 and a solid hydrate 32 .

[0051] In this embodiment, the thermal insulation substrate 33 is a support carrier for the solid hydrate 32, which itself also has thermal insulation properties and is used to prevent heat spread in thermal runaway cells. Specifically, the thermal insulation substrate 33 is an aerogel 41 material, including oxide aerogel 41, carbon aerogel 41, carbide aerogel 41, organic aerogel 41, such as silica aerogel 41, alumina aerogel 41, aldehyde aerogel 41 (gel formed by the reaction of aldehyde compounds with other substances), etc. The solid hydrate 32 is a combination of one or more crystalline, amorphous oxide materials or salt materials rich in crystalline water. It is used to transform from solid to liquid at low temperatures after thermal runaway of the single cell 43 occurs, and absorb heat during the transformation from liquid to gas at high temperatures. Specifically, the crystalline oxide material rich in crystalline water can be copper sulfate pentahydrate; the amorphous oxide material rich in crystalline water can be amorphous silica-hydrate; and the crystalline salt material rich in crystalline water can be sodium sulfate decahydrate (glauber's salt). Specifically, the solid hydrate 32 is uniformly infiltrated into the heat-insulating substrate 33 in liquid form, and the heat-insulating substrate 33 and the solid hydrate 32 are compounded together by pressure and temperature changes to form the solid phase change material 3 .

[0052] See also Figures 1 to 4 In one embodiment, the packaging film 1 is concave in the middle and has packaging edges 10 formed around it. The packaging edges 10 of the two packaging films 1 cover each other and seal to form a accommodating cavity 11 for wrapping the thermal protective film 2 and the phase change material 3.

[0053] In this embodiment, the concave center portion of the packaging film 1 effectively utilizes the internal space to accommodate the thermally conductive protective film 2 and phase change material 3. Compared to a flat packaging film 1, the concave shape provides a larger internal volume within a limited planar projection area. This ensures sufficient space for the thermally conductive protective film 2 and phase change material 3. Furthermore, the thermal insulation structure 44 can be arranged more compactly within the battery's internal layout, thereby increasing the battery's energy density. The surrounding packaging edge 10 facilitates the sealed connection between the two packaging films 1. When the packaging edges 10 of the two packaging films 1 are sealed together, a relatively closed accommodating cavity 11 is formed. This sealing method is relatively simple and effective, preventing external air, moisture, or impurities from entering the accommodating cavity 11, thereby protecting the internal thermally conductive protective film 2 and phase change material 3 from the external environment. If external air or moisture enters, it may affect the performance of the phase change material 3, for example, causing it to deteriorate due to moisture or undergo unwanted chemical reactions, thereby affecting its phase change properties and thermal insulation effect. At the same time, for the thermally conductive protective film 2, avoiding contact with the external environment also helps to prevent it from being oxidized or corroded, thereby extending its service life.

[0054] It is understandable that within a battery, the space between cells is typically limited. This design of a packaging film 1 with a concave center and a sealing edge 10 around the perimeter can better accommodate the irregular shapes and limited spaces between cells. It can tightly wrap the thermally conductive protective film 2 and phase change material 3 and more easily conform to the shape of the cells during battery assembly, allowing the entire thermal insulation structure 44 to be stably placed between the cells, achieving effective thermal insulation without occupying excessive internal battery space, thus facilitating optimization of the overall battery structure.

[0055] See also Figures 1 to 11 In one embodiment, the four corners of the thermally conductive protective film 2 and the phase change material 3 are all rounded, and the thickness of the phase change material 3 is 3 mm. In this embodiment, the four corners of the thermally conductive protective film 2 and the phase change material 3 are all rounded to avoid damage to the packaging film 1 caused by sharp corners during assembly or use. When the thickness of the phase change material 3 of the present application is 3 mm, it can be achieved that after a single cell 43 in the battery thermally runs away, the single cell 43 that thermally runs away will not trigger thermal runaway of other single cells 43.

[0056] For details, please refer to Figure 5-Figure 8 ,like Figure 5As shown, the single cell 43, aerogel 41, thermal insulation material, and heating plate 42 are arranged from left to right in the following order through a fixture 40 and bolts: fixture 40, aerogel 41, heating plate 42, single cell 43, thermal insulation structure 44, single cell 43, aerogel 41, and fixture 40. One of the cells is heated by the heating plate 42 to cause thermal runaway. The thermal runaway cell conducts heat to the other single cell 43 through the thermal insulation structure 44. The state of the single cell 43 is observed and the temperature at different locations is detected to determine the protective thermal insulation capacity of the thermal insulation structure 44. The temperature of the two single cells 43 to be tested is monitored at different locations T1-T6, and the voltage test V1-V2 (V1 is the voltage of the thermal runaway cell, and V2 is the voltage of the cell to be tested) is performed. Please refer to Figures 6 to 8 When the thickness of the phase change material 3 is 2 mm, as the temperature of the heating plate increases, when heated to 50 seconds, the single cell 43 thermally runs away, and when it continues to 480 seconds, the adjacent single cell 43 also thermally runs away. Therefore, when the phase change material 3 is 2 mm thick, it can block the spread of heat for 430 seconds; when the thickness of the phase change material 3 is 3 mm, the heating plate is also heated to 50 seconds, and the single cell 43 thermally runs away. As time goes on, the adjacent cells do not thermally run away, and the temperature components at the test points T4 to T6 return to a stable state, so that after the thermal runaway of the single cell 43 in the battery, the thermal runaway single cell 43 does not trigger the thermal runaway of other single cells 43; when the traditional aerogel 41 material is placed between two adjacent single cells 43, the single cell 43 also thermally runs away when heated to 50 seconds, and the temperature at the T4 to T6 points continues to rise, and the adjacent single cell 43 thermally runs away at 125 seconds.

[0057] For further information, please refer to Figures 9 to 11 The present application also tests the voltage of two single cells 43 in thermal runaway. When the phase change material 3 is 2 mm thick, after heating for 50 seconds until the single cell 43 thermally runs away, the voltage continues to decrease from the start of thermal runaway. When it reaches 480 seconds, the adjacent cell also experiences thermal runaway, and the voltage begins to decrease continuously. When the phase change material 3 is 3 mm thick, after heating for 50 seconds until the single cell 43 thermally runs away, the voltage continues to decrease from the start of runaway, while the voltage of the adjacent single cell 43 is not affected, further illustrating that the 3 mm thick thermal insulation structure 44 can block the heat spread of the thermal runaway single cell 43. When the traditional aerogel 41 material is set between the single cells 43, after heating for 50 seconds until the single cell 43 thermally runs away, the adjacent single cell 43 experiences thermal runaway at 125 seconds, and the voltage continues to decrease.

[0058] In the above embodiment, in the thermal insulation structure 44 of the application, when the phase change material 3 is 2mm, the heat propagation time can be blocked for 430s, when the phase change material 3 is 3mm, there is no heat propagation between adjacent single battery cells 43, and the heat propagation blocking time between the two adjacent battery cells in the traditional aerogel 41 scheme is only 75s. When the application is applied to an electric vehicle, the escape time of passengers is greatly increased when the single battery cell 43 is out of control.

[0059] Further, the edges of the packaging film 1 are all provided with rounded corners, which can better protect the phase change material 3 and the heat-conducting protective film 2 in the containing cavity 11.

[0060] In order to achieve the purpose of the application, in an embodiment, the application further provides a battery comprising the thermal insulation structure 44 of any of the above embodiments.

[0061] In the embodiment, the battery includes a square shell battery, a soft package battery and a cylindrical battery. The application does not limit the type of battery, as long as the single battery cell 43 is grouped and the thermal insulation structure 44 is arranged between the single battery cell 43.

[0062] In order to achieve the purpose of the application, in an embodiment, the application further provides an electric device comprising the above battery.

[0063] The electric device can be a vehicle, a ship, a spacecraft, a portable device and an electric tool. It can be understood that the technical solutions described in the embodiments of the application are applicable to all electric devices including batteries.

[0064] In summary, the thermal insulation structure 44 of the embodiment of the application comprises a packaging film 1, a heat-conducting protective film 2 and a phase change material 3, the packaging film 1 is provided with a containing cavity 11, the phase change material 3 and the heat-conducting protective film 2 are all encapsulated in the containing cavity 11, and the phase change material 3 is arranged between the two heat-conducting protective films 2. The technical solution combines the phase change material 3 with the traditional aerogel 41 and combines it with the heat-conducting protective film 2 to form a new thermal insulation structure 44 wrapped in the packaging film 1. When the single battery cell 43 is out of control, the phase change material 3 absorbs heat to change its state from solid to liquid and gas. In the process of changing the state of the phase change material 3, it can maintain at a certain temperature for a long time, and can provide longer liquid cooling for the battery cooling system, and further reduce the temperature of the out-of-control battery cell. When the temperature of the out-of-control battery cell is reduced to a safe temperature, the temperature difference between it and the adjacent battery cell is reduced, which is not enough to cause thermal runaway of the adjacent battery cell, so as to prevent heat conduction from the out-of-control battery cell to the adjacent battery cell.

[0065] Compared with the prior art, a battery according to an embodiment of the present application includes any of the above-mentioned heat insulation structures 44. It is understood that the battery according to the present application can include all the technical features and technical effects of the above-mentioned heat insulation structure 44, which will not be described in detail here.

[0066] Compared to the prior art, an electrical device according to an embodiment of the present application includes any of the batteries described above. It is understood that the electrical device of the present application can include the aforementioned batteries. It is understood that the electrical device of the present application can include all the technical features and technical effects of the aforementioned batteries, which will not be further elaborated here.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A thermal insulation structure, characterized in that: include: A packaging film, a heat-conducting protective film and a phase change material, wherein the packaging film is provided with a receiving cavity, the phase change material and the heat-conducting protective film are both packaged in the receiving cavity, and the heat-conducting protective film wraps the phase change material.

2. The thermal insulation structure according to claim 1, characterized in that The phase change material is formed by compounding a heat-insulating substrate and a solid hydrate, and the heat-insulating substrate is a supporting carrier of the solid hydrate.

3. The thermal insulation structure according to claim 2, characterized in that: The heat insulation substrate is an aerogel material.

4. The thermal insulation structure according to claim 1, characterized in that The heat-conductive protective film is a metal sheet.

5. The thermal insulation structure according to claim 1, characterized in that The packaging film is a pressure-resistant flexible insulating film.

6. The thermal insulation structure according to claim 1, characterized in that The packaging film is concave in the middle and has packaging edges formed around it. The packaging edges of the two packaging films cover and seal each other to form a receiving cavity for wrapping the heat-conducting protective film and the phase change material.

7. The thermal insulation structure according to claim 1, characterized in that The four corners of the thermally conductive protective film and the phase change material are all rounded, and the rounded corners are used to avoid damaging the packaging film during the assembly process.

8. A battery, characterized in that: The thermal insulation structure comprises the thermal insulation structure according to any one of claims 1 to 7.

9. An electrical device, characterized in that: Comprising the battery as claimed in claim 8 above.

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