Heat insulation part, battery assembly and electric equipment

Abstract

The utility model relates to the battery technology, in particular to a heat insulation piece, a battery assembly and electric equipment, which comprises a heat reflecting layer and a heat absorption layer, and the heat absorption layer is arranged on at least one side of the heat reflecting layer in a laminated mode so as to effectively reduce heat transfer, absorb heat when a battery is in thermal runaway and prevent heat diffusion.

Description

Technical Field

[0001] The utility model relates to battery technology, in particular to a heat insulating member, a battery assembly and electrical equipment. Background Art

[0002] When a battery in a battery pack experiences thermal runaway, the aerogel insulation between two adjacent batteries can block heat transfer to the adjacent battery to a certain extent, preventing heat diffusion, thereby avoiding the domino effect of battery thermal runaway. However, the thermal insulation performance of the insulation in the prior art is limited and cannot effectively suppress the spread of thermal runaway. Utility Model Content

[0003] The technical problem to be solved by the first aspect of the utility model is to provide a heat insulating member, which can effectively reduce the transfer of heat and absorb heat when the battery is thermally runaway to prevent the occurrence of heat diffusion.

[0004] The technical problem to be solved by the second aspect of the utility model is to provide a battery assembly, which has good thermal insulation performance and can effectively prevent the occurrence of heat diffusion.

[0005] The technical problem to be solved by the third aspect of the utility model is to provide an electrical device with high safety performance.

[0006] In order to solve the above technical problems, the utility model provides a heat insulation member, including a heat reflection layer and a heat absorption layer, wherein the heat absorption layer is stacked on at least one side of the heat reflection layer. The heat absorption layer can absorb a large amount of heat generated when the battery is in thermal runaway, and the heat reflection layer can reflect various heat radiation rays, thereby reducing the radiation heat exchange of the batteries on both sides of the heat reflection layer.

[0007] Preferably, the heat reflective layer is used to reduce the heat radiation transfer of the battery, and the heat absorption layer is used to absorb the heat of the battery.

[0008] Preferably, the thermal insulation member further comprises a heat-conducting layer, and the heat-conducting layer is arranged between the heat-reflecting layer and the heat-absorbing layer, and / or the heat-conducting layer is arranged on a side of the heat-absorbing layer away from the heat-reflecting layer. When there is a local high-temperature area in the battery, the heat-conducting layer can prevent the local high-temperature area from heating the adjacent battery locally, thereby causing thermal runaway of the adjacent battery, and can also conduct the heat of the local high-temperature area to more areas of the heat-absorbing layer, giving full play to the role of the heat-absorbing layer.

[0009] Preferably, the heat absorbing layer is respectively provided on two surfaces of the heat reflecting layer that are arranged opposite to each other in the thickness direction.

[0010] Preferably, the heat absorption layer comprises a phase change heat absorption material.

[0011] Preferably, the heat absorbing layer comprises a heat absorbing material, and the heat absorbing material comprises hydrogel, paraffin, fatty alcohol or fatty acid.

[0012] Preferably, the heat reflective layer contains a heat reflective material, and the heat reflective material includes a metal foil, a metal-plated polyester film, a metal-plated polyimide film or an aluminum-plastic film.

[0013] Preferably, the heat absorption layer includes a non-independent support frame and / or an independent support frame; the non-independent support frame includes metal foam, fiber felt or foam, and has a plurality of pores inside, and the heat absorption material is filled in each of the pores; the independent support frame includes a cross support frame and / or a frame-shaped support frame, and the heat absorption material is filled in the gap area formed by the cross support frame, and / or the heat absorption material is filled in the area enclosed by the frame-shaped support frame. Both the non-independent support frame and / or the independent support frame can further enhance the heat insulation effect of the heat absorption material and improve the structural stability of the heat insulation component.

[0014] Preferably, the thermal insulation element further comprises an adhesive layer, and the adhesive layer is used to connect at least two of the heat absorption layer, the heat conduction layer and the heat reflection layer, so that the heat absorption layer, the heat conduction layer and the heat reflection layer can be firmly bonded together, thereby enhancing the overall structural strength of the thermal insulation element.

[0015] Preferably, the thermal insulation of the present invention also includes a packaging film, the heat reflecting layer and the heat absorbing layer are encapsulated in the packaging film, and the heat conducting layer is provided on the outside of the packaging film, so that the heat generated by the battery can be conducted to the external environment more quickly, thereby improving the heat absorption efficiency; or the heat reflecting layer, the heat absorbing layer and the heat conducting layer are all encapsulated in the packaging film, which helps to achieve a more compact battery structure.

[0016] More preferably, the packaging film includes a first packaging film and a second packaging film, the heat reflective layer and / or the heat conductive layer are packaged in the first packaging film, the heat absorbing layer and / or the heat conductive layer are packaged in the second packaging film, and the second packaging film is placed outside the first packaging film. The heat reflective layer, the heat conductive layer and the heat absorbing layer are packaged in combination or individually and then bonded to form a heat insulating member, which helps to improve production efficiency and flexibility, and is easy to repair or replace separately, reducing maintenance costs and time.

[0017] The heat reflective layer in the heat insulation of the utility model can effectively suppress heat radiation and reduce the heat transfer efficiency, and the heat absorption layer can absorb a large amount of heat generated when the battery is in thermal runaway. The heat insulation composed of the heat reflective layer and the heat absorption layer has high heat insulation and heat absorption performance.

[0018] The utility model also provides a battery assembly, which comprises a battery and the above-mentioned heat insulation component. The battery assembly has a long service life and good heat diffusion inhibition performance.

[0019] In addition, the utility model provides an electrical device, which includes the above-mentioned battery assembly.

[0020] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation to the present invention. In the accompanying drawings:

[0022] Figure 1 It is a structural schematic diagram of a first specific implementation mode of the thermal insulation element of the utility model;

[0023] Figure 2 It is a structural schematic diagram of a second specific implementation mode of the thermal insulation element of the utility model;

[0024] Figure 3 It is a structural schematic diagram of a third specific implementation mode of the thermal insulation element of the utility model;

[0025] Figure 4 It is a structural schematic diagram of a fourth specific implementation mode of the thermal insulation element of the utility model;

[0026] Figure 5 It is a structural schematic diagram of a fifth specific implementation mode of the thermal insulation element of the utility model;

[0027] Figure 6 It is a structural schematic diagram of a sixth specific implementation mode of the thermal insulation element of the utility model;

[0028] Figure 7 It is a structural schematic diagram of a seventh specific implementation mode of the thermal insulation element of the utility model;

[0029] Figure 8 It is a structural schematic diagram of the eighth specific implementation manner of the thermal insulation element of the utility model.

[0030] Description of Reference Numerals

[0031] 1-heat reflection layer, 2-heat absorption layer, 21-non-independent support frame, 221-cross-shaped support frame, 222-frame-shaped support frame, 3-heat conduction layer, 4-packaging film, 41-hot pressing part, 42-first packaging film, 43-second packaging film. DETAILED DESCRIPTION

[0032] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation modes described herein are only used to illustrate and explain the present invention, and the protection scope of the present invention is not limited to the specific implementation modes described below.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the description of the present invention, some directional words are involved to clearly illustrate the technical solution of the present invention. For example, "left and right" are the meanings analogized from the orientation of the thermal insulation member in the accompanying drawings, "inside" refers to the direction from the center of the thermal insulation member to the two sides, and "outside" refers to the direction from the two sides of the thermal insulation member to the center. It should be understood that the directional terms are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0036] refer to Figures 1 to 8 In the first aspect, the utility model provides a heat insulating member, which includes a heat reflecting layer 1 and a heat absorbing layer 2, wherein the heat absorbing layer 2 is stacked on at least one side of the heat reflecting layer 1. Specifically, the heat absorbing layer 2 can be arranged on one side or both sides of the heat reflecting layer 1, so that a large amount of heat generated when the battery cell is in thermal runaway is preferentially absorbed by the heat absorbing layer 2, so that only a small amount of heat is transferred to the heat reflecting layer 1, effectively avoiding the influence of the high heat generated when the battery cell is in thermal runaway on the service life and performance of the heat reflecting layer 1, and further, the heat radiation that cannot be absorbed by the heat absorbing layer 2 can be reflected by the heat reflecting layer 1, effectively reducing the radiation heat exchange of objects on both sides of the heat reflecting layer 1, and improving the heat insulation performance, safety performance and service life of the heat insulating member.

[0037] In some embodiments, the heat reflective layer 1 is used to reduce the heat radiation transfer of the battery; the heat absorption layer 2 is used to absorb the heat of the battery. The cooperation between the heat reflective layer 1 and the heat absorption layer 2 effectively improves the heat insulation performance of the heat insulation component to the battery.

[0038] In some embodiments, the thermal insulation also includes a heat-conducting layer 3, which can be used to equalize the temperature of the battery and optimize the performance of the heat-absorbing layer 2. The heat-conducting layer 3 has a heat-conducting material, which can be a heat-conducting metal material, specifically copper, aluminum, gold, iron, silver, magnesium, nickel and other metal foils, sheets or coatings, or copper, aluminum, gold, iron, silver, magnesium, nickel and other alloy foils, sheets or coatings. The heat-conducting material can also be a non-metallic material, specifically graphite, graphene, aluminum oxide, silicon carbide and other non-metallic sheets or coatings with high thermal conductivity. In addition, the shape of the heat-conducting layer 3 can also be one or more strip-shaped sheets or meshes. After the battery has thermal runaway, the different heat generation characteristics of different positions of the battery lead to uneven temperature inside the battery. The battery may have a local high temperature area, which may cause the corresponding local temperature of the adjacent battery to rise rapidly, and finally cause thermal runaway of the adjacent battery. The utility model is provided with a heat-conducting layer 3, which can effectively help the battery to equalize the temperature and prevent the temperature of the local area of ​​the battery from being too high. Specifically, the heat absorption layer 2 is generally a sheet structure of equal thickness. The thickness of the heat absorption material corresponding to the local high temperature zone and the local low temperature zone of the battery is the same, so that only the heat absorption material in the local high temperature zone can play a role. By adding a heat conductive layer 3, the heat in the local high temperature zone can be conducted to the local low temperature zone, thereby enhancing the use efficiency of the heat absorption layer 2.

[0039] The heat-conducting layer 3 may be disposed between the heat-reflecting layer 1 and the heat-absorbing layer 2. Figure 2 and Figure 3 The heat absorption layer 2 is located at the outermost side and close to the battery cell, which can quickly absorb the heat generated by the battery cell. When the battery cell generates an instantaneous heat peak, it can effectively alleviate the instantaneous thermal shock and reduce the damage to the battery cell and other components. The heat conductive layer 3 is arranged on both sides of the heat reflective layer 1 to prevent the local high temperature points generated by the thermal runaway battery cell from causing high temperature damage to the heat reflective layer 1. The heat conductive layer 3 can be arranged on the side of the heat absorption layer 2 away from the heat reflective layer 1. For example, refer to Figure 1, heat absorbing layers 2 are respectively arranged on two surfaces opposite to each other in the thickness direction of the heat reflecting layer 1, and a heat conducting layer 3 is arranged on the other side of each heat absorbing layer 2. In this embodiment, the heat conducting layer 3 is close to the battery cell, so that the heat generated by the battery cell can be quickly transferred to the heat absorbing layer 2, and the local high heat generated by the battery cell can be preferentially and evenly distributed to the entire heat insulation area, which not only avoids local overheating of the battery cell, but also improves the working efficiency of the entire heat absorbing layer 2. The heat absorbing layer 2 is located on the other side of the heat conducting layer 3, which can quickly absorb and temporarily store the heat transferred from the heat conducting layer 3, which helps to alleviate the rapid rise of the battery cell temperature and provide sufficient time for the heat to be further dissipated to the external environment. The heat conducting layer 3 can be arranged between the heat reflecting layer 1 and the heat absorbing layer 2, and on the side of the heat absorbing layer 2 away from the heat reflecting layer 1. Based on the above embodiment, the specific setting position of the heat conducting layer 3 and the number of heat conducting layers 3 can be selected according to actual use requirements.

[0040] In some embodiments, two surfaces of the heat reflective layer 1 that are arranged opposite to each other in the thickness direction are respectively provided with heat absorption layers 2, thereby being able to absorb most of the heat generated by the thermal runaway battery cell to avoid damage to the heat reflective layer 1 caused by high temperature, thereby affecting the service life and performance of the heat reflective layer 1. For example, refer to Figure 3 , two heat reflective layers 1 are arranged opposite to each other in the thickness direction, a heat absorbing layer 2 is arranged between the two adjacent surfaces of the two heat reflective layers 1, and the two surfaces of the two heat reflective layers 1 that are far away from each other are respectively provided with a heat conducting layer 3 and a heat absorbing layer 2 in sequence from the inside to the outside. The provision of two heat reflective layers 1 can further enhance the thermal insulation performance of the thermal insulation component. Specifically, when a large battery has thermal runaway, a large amount of heat radiation is difficult to be completely reflected by a single-layer heat reflective layer 1, and part of the heat and heat radiation continue to be transferred to the other side through the single-layer heat reflective layer 1, wherein the heat is absorbed by the heat absorbing layer 2, and the heat radiation continues to be reflected by the other heat reflective layer 1, thereby avoiding the heat and heat radiation from being transferred to the battery on the other side. In addition, a heat conducting layer 3 may be provided between the two adjacent surfaces of the two heat reflective layers 1, or a heat absorbing layer 2 and a heat conducting layer 3 may be provided between the two adjacent surfaces of the two heat reflective layers 1, and a heat conducting layer 3 and a heat absorbing layer 2 may be provided in sequence from the inside to the outside on the two surfaces of the two heat reflective layers 1 that are far away from each other. Based on the above embodiments, the arrangement and combination sequence and quantity of the heat reflective layer 1, the heat absorption layer 2 and the heat conductive layer 3 can be selected according to actual use requirements, and will not be elaborated herein.

[0041] In some embodiments, the heat absorption layer 2 has a phase-change heat absorption material. When the battery temperature rises to the melting point of the phase-change heat absorption material, the phase-change heat absorption material changes from a solid state to a liquid and / or a gaseous state to absorb the heat generated by the battery. In this way, the temperature of the battery can be effectively adjusted, the battery can be prevented from overheating, and the performance and safety of the battery can be enhanced.

[0042] In some embodiments, the heat absorption layer 2 has a heat absorption material, and the heat absorption material includes hydrogel, paraffin, fatty alcohol or fatty acid.

[0043] In some embodiments, the heat reflective layer 1 has a heat reflective material, which includes metal foil (aluminum foil, nickel foil, etc.), metal-plated polyester film, metal-plated polyimide film or aluminum-plastic film, etc. For example, the heat reflective layer 1 may include glass fiber cloth carrying the above-mentioned heat reflective material. The above-mentioned heat reflective material has a high heat reflectivity and can reflect various radiation rays (such as visible light, infrared, etc.). When the battery cell has thermal runaway, a large amount of heat will be released accompanied by thermal radiation, and the higher the temperature, the greater the intensity of thermal radiation. The heat reflective layer 1 can effectively reflect thermal radiation, thereby reducing the heat transfer efficiency, thereby avoiding high temperature from having a negative impact on adjacent batteries and battery peripheral components. For example, the heat absorbing material hydrogel of the heat absorbing layer 2 is usually a transparent material with a high transmittance to thermal radiation. By setting the heat reflective layer 1, the radiation heat transfer between batteries can be effectively reduced. By setting the heat reflective layer 1 and the heat absorbing layer 2 in the thermal insulation, not only a large amount of heat generated when the battery is in thermal runaway can be absorbed, but also the thermal radiation can be blocked from continuing to be transferred to adjacent batteries.

[0044] In some embodiments, reference Figure 4 , the heat absorption layer 2 includes a non-independent support skeleton 21, which includes metal foam, fiber felt or foam, and has multiple pores inside, and the heat absorption material is filled in each pore. Exemplarily, after the hydrogel heat absorption material is filled into the pores of the non-independent support skeleton 21, it can form a metal foam heat absorption layer 2 loaded with hydrogel, a fiber felt heat absorption layer 2 loaded with hydrogel, and a foam heat absorption layer 2 loaded with hydrogel. The non-independent support skeleton 21 in the heat absorption layer 2 can be distributed in the entire heat absorption material area, or in part of the heat absorption material area, so as to achieve different performance requirements for the heat absorption layer 2. Reference Figure 5 and Figure 6 The heat absorption layer 2 also includes an independent support frame, and the independent support frame has a cross support frame 221 and / or a frame-shaped support frame 222. Specifically, refer to Figure 5 The cross support frame 221 can be formed by cross-connecting two long strip support frames, and the heat absorbing material is filled in the gap area formed by the cross support frames 221. Preferably, the two long strip support frames are perpendicular to each other to form a cross support frame, and the heat absorbing material is filled in the four square areas formed by the cross support frame 221. The structural design of the cross support frame 221 can provide stability and support for the heat absorbing material. Figure 6The frame-shaped support skeleton 222 encloses an embedded space, and the heat absorbing material is filled in the embedded space of the frame-shaped support skeleton 222. Since the frame-shaped support skeleton has a closed frame structure, its overall stability is usually better than that of the cross-shaped support skeleton, which helps to prevent the heat absorbing layer 2 from tilting or twisting during operation. The material of the above-mentioned independent support skeleton may include metal foam, fiber felt, foam, aerogel, aerogel with reinforced fiber, glass fiber felt, glass fiber mesh, sunscreen loaded fiber felt, silicone rubber support, fluororubber support, metal support or graphite support. The above-mentioned independent support skeleton occupies a part of the volume in the heat absorbing layer 2, so that this part of the occupied volume in the heat absorbing layer 2 does not have the phase change heat absorption capacity, but the independent support skeleton can improve the overall performance of the heat insulation component in terms of heat insulation capacity, mechanical properties, or temperature uniformity, and the independent support skeleton and the heat absorbing material area are independent of each other and do not interfere with each other, which is easier to achieve in terms of process.

[0045] In addition, in some embodiments, the heat absorption layer 2 may also have a non-independent support frame 21 and an independent support frame. For example, the heat absorption material is filled in the non-independent support frame 21 and placed in four gap areas formed by the crossed support frames 221; or the heat absorption material is filled in the non-independent support frame 21 and placed in a square frame structure formed by the frame-shaped support frame 222. The heat absorption layer 2 is provided with a non-independent support frame 221 and an independent support frame, which can effectively improve the mechanical properties of the heat absorption material. Exemplarily, the heat-absorbing material is hydrogel. When the battery cell has thermal runaway, the large surface of the battery will generate huge expansion force and squeeze the battery insulation. The expansion force at the center of the large surface of the battery is larger than that at other positions of the battery. In this case, a non-independent support skeleton 21 may be provided at the middle position of the heat-absorbing layer 2, or a cross support skeleton 221 may be provided in the heat-absorbing layer 2, or a non-independent support skeleton 21 and a cross support skeleton 221 may be provided in the heat-absorbing layer 2 to avoid the hydrogel heat-absorbing material at the middle position from being squeezed and deformed and overflowing from the middle position to the surroundings, resulting in less heat absorption at the center of the large surface of the battery. This further avoids the intensification of heat transfer caused by the proximity or adhesion of the middle position of the runaway battery cell and the heated battery cell after the phase change material at the center is consumed. Therefore, in a preferred case, a non-independent support skeleton 21 and / or an independent support skeleton may be provided at a position where the heat absorption layer 2 fits in the middle of the battery cell to resist the expansion and deformation of the battery cell, so as to effectively prevent the thermal runaway battery cell from being close to the non-thermal runaway battery cell after the phase change heat absorption material is consumed, and to provide continuous heat insulation, thereby preventing the occurrence of heat diffusion.

[0046] In some embodiments, the thermal insulation element further includes an adhesive layer, which is used to connect at least two of the heat absorbing layer 2, the heat conducting layer 3 and the heat reflecting layer 1. Exemplarily, the adhesive layer can be an organic adhesive or an inorganic adhesive, and both have the advantage of high temperature resistance.

[0047] In some embodiments, the thermal insulation member of the present invention further comprises a packaging film 4. Preferably, the packaging film 4 has a hot pressing portion 41, so that the material layer in the packaging film 4 can be sealed by hot pressing to improve the structural stability of the thermal insulation member. Figure 7 , heat-absorbing layers 2 are provided on both sides of the heat-reflecting layer 1, and the heat-reflecting layer 1 and the heat-absorbing layer 2 are both sealed in the packaging film 4, and heat-conducting layers 3 are provided on both sides of the outside of the packaging film 4. In addition, the heat-reflecting layer 1, the heat-absorbing layer 2 and the heat-conducting layer 3 can also be arranged in the packaging film 4, thereby making the entire thermal insulation component more compact in structure, reducing space occupation, and being suitable for application scenarios with limited space.

[0048] In some embodiments, reference Figure 8 , the packaging film 4 includes a first packaging film 42 and a second packaging film 43, the heat reflection layer 1 and / or the heat conduction layer 3 are packaged in the first packaging film 42, the heat absorption layer 2 and / or the heat conduction layer 3 are packaged in the second packaging film 43, and the second packaging film 43 is placed outside the first packaging film 42. In addition, the heat reflection layer 1 can also be packaged in the first packaging film 42, the heat absorption layer 2 is arranged in the second packaging film 43 and is placed on both sides of the heat reflection layer 1, and the heat conduction layer 3 is not sealed by the packaging film 4 and is arranged on the other side of the heat absorption layer 2. In the above embodiment, the structure of sealing and bonding each material layer individually or in combination can enable each independent part to be carried out separately during the production and assembly process, thereby improving production efficiency and flexibility, and can also ensure the independence of the functions of each material layer, so that the functions of each material layer are not affected by each other, thereby improving the functional utilization efficiency of each material layer. In addition, if any independent part of the thermal insulation component is damaged or the performance is degraded during use, it can be repaired or replaced separately without replacing the entire thermal insulation component, thereby reducing maintenance costs.

[0049] In addition, in some embodiments, the thermal insulation element may be provided with a functional layer to further enhance the performance of the thermal insulation element. The functional layer may include a fire extinguishing layer and an insulating layer.

[0050] The second aspect of the utility model provides a battery assembly, comprising the heat insulating member of each of the above embodiments. The heat insulating member is arranged between two adjacent batteries in the battery assembly and contacts the external environment to isolate the heat transfer between the adjacent batteries and absorb the heat generated when the battery is in thermal runaway to prevent the occurrence of heat diffusion.

[0051] The third aspect of the present invention provides an electrical device, which includes the heat insulation provided by the first aspect of the present invention or the battery assembly provided by the second aspect of the present invention, and has all the beneficial effects thereof, which will not be described in detail here. It should be noted that the electrical device provided by the present invention includes but is not limited to vehicles, energy storage systems, mobile electronic devices, etc.

[0052] As a specific embodiment of the present invention, refer to Figure 7 The heat insulation member includes a heat reflection layer 1, a heat absorption layer 2 and a heat conduction layer 3. The heat reflection layer 1 is placed in the middle position. The heat absorption layer 2 has two and is separately arranged on both sides of the heat reflection layer 1. The heat absorption layer 2 is provided with a non-independent support skeleton 21. The heat absorption layer 2 and the heat reflection layer 1 are sealed by a packaging film 4 after bonding. The heat conduction layer 3 has two and is separately arranged on both sides of the packaging film 4. In this embodiment, the heat reflection layer 1 can effectively reduce the radiation heat exchange between batteries. The heat absorption layer 2 can take away a large amount of heat generated by thermal runaway of the battery cell through the heat absorption material. The heat absorption layer 2 has a non-independent support skeleton 21, which can enhance the resilience, compression resistance and shear resistance of the heat absorption layer 2, and can effectively buffer the thermal expansion and deformation of the battery cell. After the phase change material is consumed, the skeleton can support the battery cells on both sides to prevent the battery cells from approaching, thereby reducing the heat conduction of thermal runaway. The heat conduction layer 3 can enhance the heat conduction on the battery surface, help the battery cell to dissipate heat outward, and also help to evenly heat the battery cell and the heat insulation member, and prevent heat diffusion caused by local high temperature points.

[0053] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0055] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A thermal insulation member, characterized in that: It comprises a heat reflecting layer (1) and a heat absorbing layer (2), wherein the heat absorbing layer (2) is stacked on at least one side of the heat reflecting layer (1); The heat reflection layer (1) is used to reduce the heat radiation transfer of the battery; the heat absorption layer (2) is used to absorb the heat of the battery; The thermal insulation element further comprises a heat conducting layer (3), The heat-conducting layer (3) is arranged between the heat-reflecting layer (1) and the heat-absorbing layer (2), and / or the heat-conducting layer (3) is arranged on a side of the heat-absorbing layer (2) away from the heat-reflecting layer (1); The thermal insulation member further comprises a packaging film (4); The heat reflection layer (1) and the heat absorption layer (2) are encapsulated in the encapsulation film (4), and the heat conduction layer (3) is provided outside the encapsulation film (4); or the heat reflection layer (1), the heat absorption layer (2) and the heat conduction layer (3) are all encapsulated in the encapsulation film (4); The packaging film (4) comprises a first packaging film (42) and a second packaging film (43); the heat reflective layer (1) and / or the heat conductive layer (3) are packaged in the first packaging film (42); the heat absorption layer (2) and / or the heat conductive layer (3) are packaged in the second packaging film (43); and the second packaging film (43) is placed outside the first packaging film (42).

2. The thermal insulation element according to claim 1, characterized in that: The heat absorbing layer (2) is respectively provided on two surfaces of the heat reflecting layer (1) that are arranged opposite to each other in the thickness direction.

3. The thermal insulation element according to claim 1, characterized in that: The heat absorption layer (2) comprises a non-independent support skeleton (21) and / or an independent support skeleton; The non-independent supporting skeleton (21) has a plurality of pores inside; The independent support frame comprises a crossed support frame (221) and / or a frame-shaped support frame (222).

4. The thermal insulation element according to claim 1, characterized in that: The thermal insulation element further comprises an adhesive layer, wherein the adhesive layer is used to connect at least two of the heat absorption layer (2), the heat conduction layer (3) and the heat reflection layer (1).

5. A battery assembly, characterized in that: The invention comprises a battery and the thermal insulation member according to any one of claims 1 to 4.

6. An electrical equipment, characterized in that: Comprising the battery assembly as claimed in claim 5.

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