Heat-resistant protection structure, battery module and electrical equipment

Abstract

The present invention relates to the field of battery technology, and in particular to a heat-resistant protective structure, a battery module, and an electrical device. The heat-resistant protective structure includes a heat-absorbing layer; the heat-absorbing layer includes a middle area and an edge area arranged around the middle area, the heat-absorbing performance of the middle area is greater than that of the edge area, the heat-absorbing performance of the heat-absorbing layer is unevenly distributed, and the heat-absorbing performance of the middle area is stronger, so that the middle area can absorb more heat; when the middle area is heated, its heat-absorbing effect can be better exerted, and the middle area can be prevented from being quickly consumed, thereby improving the effect of suppressing heat spread, ensuring that the battery connected to the heat-resistant protective structure can continue to be in a uniform and low temperature state, and effectively improving the stability and safety of the battery module provided with the battery.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a heat-resistant protection structure, a battery module and an electrical device. Background Art

[0002] The battery module includes a heat-resistant protective member and a battery, and the heat-resistant protective member is arranged between two adjacent batteries. When the battery module is in thermal runaway, the heat-resistant protective member is used to isolate the heat transfer between the batteries to ensure the stability and safety of the battery module. However, the current heat-resistant protective member is not effective in ensuring the stability and safety of the battery module. Summary of the invention

[0003] The embodiments of the present invention provide a heat-resistant protection structure, a battery module and an electrical device to solve the technical problem that the heat-resistant protection parts in the prior art are not effective in ensuring the stability and safety of the battery module.

[0004] In a first aspect, an embodiment of the present invention provides a heat-resistant protective structure, which includes a heat absorption layer; the heat absorption layer includes a middle area and an edge area arranged around the middle area, and the heat absorption performance of the middle area is greater than the heat absorption performance of the edge area.

[0005] Optionally, the heat-resistant protection structure further includes a heat-insulating layer, and the heat-absorbing layer is embedded in the heat-insulating layer.

[0006] Optionally, the heat-resistant protection structure includes a plurality of heat-absorbing components, which are respectively embedded in the heat-insulating layer to form the heat-absorbing layer, the heat-absorbing component located in the middle area is a first heat-absorbing component, and the heat-absorbing component located in the edge area is a second heat-absorbing component, and the heat-absorbing performance of the first heat-absorbing component is greater than the heat-absorbing performance of the second heat-absorbing component.

[0007] Optionally, from the middle area to the edge area, the width of the first heat absorption member is greater than the width of the second heat absorption member.

[0008] Optionally, when the first heat absorbing member and the second heat absorbing member are made of the same material, along the thickness direction of the heat insulating layer of the heat-resistant protection structure, the thickness of the first heat absorbing member is greater than the thickness of the second heat absorbing member.

[0009] Optionally, the heat absorbing component is in an annular structure; from the middle area to the edge area, a plurality of the heat absorbing components are sequentially sleeved and arranged at intervals.

[0010] Optionally, radial widths of the plurality of heat absorbing components decrease successively from the middle region to the edge region.

[0011] Optionally, the heat absorption element includes at least two sub-heat absorption elements, and the at least two sub-heat absorption elements are arranged in sequence at intervals and enclosed to form the annular structure.

[0012] Optionally, the annular structure is at least one of a circular ring structure, an elliptical ring structure, a diamond ring structure, and a rectangular ring structure.

[0013] Optionally, the activation energy of the material of the first heat absorption component is lower than the activation energy of the material of the second heat absorption component, and / or the absolute value of the phase change enthalpy value of the material of the first heat absorption component is higher than the absolute value of the phase change enthalpy value of the material of the second heat absorption component.

[0014] Optionally, the heat absorption layer is further provided with a transition region, and the transition region is provided between the middle region and the edge region; the heat absorption performance of the middle region, the transition region and the edge region decreases in sequence.

[0015] Optionally, one side of the heat-resistant protective structure along the thickness direction is a heat-absorbing surface, and the heat-absorbing surface has two opposite long sides and two short sides, the length of the long side is b, the length of the short side is a, and the heat-absorbing surface is 1 A circular area is formed on the heat absorption surface with a radius of 0.33a, and the middle area corresponds to the circular area. A first elliptical area is formed on the heat absorption surface with a short semi-axis of 0.33a and a long semi-axis of (3×b / a-1) / 6×a. The midpoint of the line connecting the two foci of the first elliptical area coincides with the center of the heat absorption surface. The transition area corresponds to the area of ​​the first elliptical area excluding the circular area. The area in the heat absorption layer excluding the middle area and the transition area is the edge area.

[0016] Optionally, one side of the heat-resistant protection structure along its thickness direction is a heat-absorbing surface, and the heat-absorbing surface has two opposite long sides and two short sides, the length of the long side is b, and the length of the short side is a, and when 4≤b / a<50: with the short semi-axis being 0.5a and the long semi-axis being 0.2b, a second elliptical area is formed on the heat-absorbing surface, the midpoint of the line connecting the two foci of the second elliptical area coincides with the center of the heat-absorbing surface, and the middle area corresponds to the second elliptical area; with the short semi-axis being 0.75a and the long semi-axis being 0.25b, a third elliptical area is formed on the heat-absorbing surface, the midpoint of the line connecting the two foci of the third elliptical area coincides with the center of the heat-absorbing surface, and the transition area corresponds to the area of ​​the third elliptical area excluding the second elliptical area; the area in the heat-absorbing layer excluding the middle area and the transition area is the edge area.

[0017] ​Optionally, the heat absorption layer is provided as one layer; and / or, the heat absorption layer is provided as at least two layers, and the at least two layers of the heat absorption layer are stacked and arranged at intervals along the thickness direction of the heat insulation layer of the heat-resistant protective structure.

[0018] Optionally, along the thickness direction of the heat-resistant protective structure insulation layer, the thickness of the heat-absorbing layer is 0.01mm-1.5mm; and / or the thickness of the insulation layer is 1mm-10mm; and / or the insulation layer is made of aerogel material.

[0019] Optionally, the heat absorption element is made of at least one of phase change material and chemical heat storage material.

[0020] Optionally, the phase change material includes but is not limited to at least one of a hydrated salt phase change material, an organic phase change material, a molten salt phase change material, a metal phase change material, and an alloy phase change material.

[0021] Optionally, the chemical heat storage material includes but is not limited to at least one of nickel hydroxide, magnesium hydroxide, magnesium dihydride, cobalt trioxide, lead carbonate, ammonium bisulfate, calcium hydroxide, strontium hydroxide, calcium carbonate, barium peroxide, and barium hydroxide.

[0022] Optionally, along the thickness direction of the thermal insulation layer of the heat-resistant protective structure, a radiation blocking layer is provided on the surface of at least one side of the thermal insulation layer.

[0023] Optionally, the radiation blocking layer has a thickness of 0.1 mm-1 mm; and / or the radiation blocking layer is made of at least one of a radiation blocking material and a reflective heat insulating material.

[0024] In a second aspect, an embodiment of the present invention provides a battery module, the battery module comprising a plurality of batteries and the heat-resistant protection structure as described above; the heat-resistant protection structure is arranged between two adjacent batteries.

[0025] In a third aspect, an embodiment of the present invention further provides an electrical device, the electrical device comprising a device body and a battery module as described above, the device body being electrically connected to the battery module.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] In the heat-resistant protective structure in the embodiment of the present invention, the heat absorption layer includes a middle area and an edge area arranged around the middle area. The heat absorption performance of the middle area is greater than that of the edge area. The heat absorption performance of the heat absorption layer is unevenly distributed, and the heat absorption performance of the middle area is stronger, so that the middle area can absorb more heat; when the middle area is heated to a high temperature, its heat absorption effect can be better exerted, and the middle area can be prevented from being quickly consumed, thereby improving the effect of suppressing heat spread, ensuring that the battery connected to the heat-resistant protective structure can continue to be in a uniform and low temperature state, and effectively improving the stability and safety of the battery module provided with the battery.

[0028] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below.

[0030] Figure 1 A schematic structural diagram of a front view of a heat-resistant protection structure provided by an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of a cross-sectional view of a heat-resistant protective structure provided by an embodiment of the present invention along its thickness direction Figure 1 ;

[0032] Figure 3 A schematic structural diagram of a partial cross-sectional view perpendicular to the thickness direction of a heat-resistant protective structure provided by an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the distribution of the middle area, transition area and edge area of ​​the heat-resistant protection structure provided in an embodiment of the present invention;

[0034] Figure 5 A schematic diagram of a cross-sectional view of a heat-resistant protective structure provided by an embodiment of the present invention along its thickness direction Figure 2 ;

[0035] Figure 6 An experimental schematic diagram of a heat-resistant protection structure provided by an embodiment of the present invention;

[0036] Figure 7 This is a comparison chart of the center temperature of the simulation study;

[0037] Figure 8 This is a comparison chart of the average temperatures of the simulation study;

[0038] Fig. 9 The temperature distribution diagram of the non-heated surface of the heat-resistant protection structure in the simulation study;

[0039] Fig.10 Comparison chart of the center temperature and average temperature of the simulation study.

[0040] 10-heat absorbing element; 12-heat absorbing layer; 13-middle area; 14-transition area; 15-insulating layer; 16-radiation blocking layer; 18-edge area;

[0041] a-heat source; b-heat-resistant protective structure; c-insulating layer; d-heat-absorbing layer. DETAILED DESCRIPTION

[0042] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can also be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0043] The embodiment of the present application discloses a heat-resistant protection structure, which is a safety component. The heat-resistant protection structure is arranged between two adjacent batteries in a battery module to isolate the heat transfer and heat absorption between the batteries, delay the heat spread of the battery itself and prevent other batteries from being heat-spread, so as to improve the stability and safety of the battery module.

[0044] Reference Figures 1 to 4 As shown, the heat-resistant protective structure includes a heat absorption layer 12 ; the heat absorption layer 12 includes a middle area 13 and an edge area 18 arranged around the middle area 13 , and the heat absorption performance of the middle area 13 is greater than that of the edge area 18 .

[0045] The heat absorption layer 12 is used to absorb and disperse heat, delay the heat spread of the battery itself and prevent other batteries from being heat spread, thereby reducing the risk of heat spread.

[0046] In the embodiment of the present application, the heat absorption layer 12 includes a middle area 13 and an edge area 18 arranged around the middle area 13. The heat absorption performance of the middle area 13 is greater than the heat absorption performance of the edge area 18. The heat absorption performance of the heat absorption layer 12 is unevenly distributed, and the heat absorption performance of the middle area 13 is stronger, so that the middle area 13 can absorb more heat; when the middle area 13 is heated to a high temperature, its heat absorption effect can be better exerted, and the middle area 13 can be prevented from being quickly consumed, thereby improving the effect of suppressing heat spread, ensuring that the battery connected to the heat-resistant protection structure can continue to be in a uniform and low temperature state, and effectively improving the stability and safety of the battery module provided with the battery.

[0047] After research, the inventors found that there is obvious non-uniformity in the temperature distribution on the heat dissipation surface where the battery contacts the heat-resistant protective structure. The middle of the heat dissipation surface accumulates the most heat and has the highest temperature. The closer to the edge of the heat dissipation surface, the faster the heat dissipates, and the lower the temperature. Due to the uneven temperature distribution on the heat dissipation surface of the battery, the temperature on the heat-resistant protective structure also has significant non-uniformity. The temperature of the area in contact with the middle of the heat dissipation surface is the highest, and the temperature of the area in contact with the edge of the heat dissipation surface is relatively low.

[0048] When the heat absorption layer in the heat-resistant protection structure is evenly distributed, the heat absorption layer in the middle of the heat dissipation surface consumes more energy than the heat absorption layer at the edge of the heat dissipation surface. This causes the heat absorption layer in the middle of the heat dissipation surface to be consumed quickly, while the heat absorption layer at the edge of the heat dissipation surface is still sufficient. After the heat absorption layer in the middle of the heat dissipation surface is consumed quickly, when the temperature in the middle is too high, it will cause local thermal runaway of the battery, which will then spread to the entire battery, causing heat spread. If the thickness of the heat absorption layer is increased, not only will the material at the edge of the heat dissipation surface be wasted, but it will also increase costs and reduce the application range of the material.

[0049] In the heat-resistant protective structure of the embodiment of the present application, the heat-absorbing layer 12 includes a middle area 13 and an edge area 18 arranged around the middle area 13. The heat-absorbing performance of the middle area 13 is greater than that of the edge area 18, which can specifically reduce the temperature in the middle of the heat dissipation surface to prevent the heat from spreading, and also avoid wasting the material at the edge of the corresponding heat dissipation surface. Moreover, the heat-absorbing layer 12 is embedded in the heat-insulating layer 15 and forms an integral structure with the heat-insulating layer 15, which effectively prevents the material of the heat-absorbing layer 12 from being lost or deviating from the original position during use, affecting the use effect of the heat-resistant protective structure. Therefore, the heat-resistant protective structure of the embodiment of the present application has the advantages of good heat-spanning effect and cost saving.

[0050] Optionally, the heat-resistant protection structure also includes an insulation layer 15, and the heat absorption layer 12 is embedded in the insulation layer 15 to form an integral structure with the insulation layer 15. The insulation layer 15 can provide a better sealing effect for the heat absorption material of the heat absorption layer 12 to ensure that the heat absorption material in the heat absorption layer 12 will not be lost during the installation process.

[0051] Optionally, the heat-resistant protection structure includes a plurality of heat absorbing members 10, which are respectively embedded in the heat insulation layer 15 to form a heat absorbing layer 12, the heat absorbing members 10 located in the middle area 13 are first heat absorbing members, and the heat absorbing members 10 located in the edge area 18 are second heat absorbing members, and the heat absorbing performance of the first heat absorbing member is greater than the heat absorbing performance of the second heat absorbing member.

[0052] In the embodiment of the present application, a plurality of heat absorbing elements 10 are respectively embedded in the heat insulating layer 15, so that the heat insulating layer 15 can have a better sealing effect on the heat absorbing elements 10, ensure that the heat absorbing material in the heat absorbing elements 10 will not be lost during the installation process, and avoid the heat absorbing elements 10 from deviating from the original position and being misplaced to affect the use effect; the heat insulating layer 15 can play a good supporting and partitioning role for the heat absorbing elements 10, and avoid the mutual influence between adjacent heat absorbing elements 10; for example, it can effectively avoid the mutual influence between materials when adjacent heat absorbing elements 10 are made of different materials, and avoid mutual interference or even mutual reaction between adjacent heat absorbing elements 10, which increases the diversity of heat absorbing materials in the entire heat absorbing layer 12 and expands the application scope of the heat-resistant protection structure; at the same time, to a certain extent, it reduces the cost.

[0053] The heat absorbing element 10 located in the middle area 13 is a first heat absorbing element, and the heat absorbing element 10 located in the edge area 18 is a second heat absorbing element. The heat absorbing performance of the first heat absorbing element is greater than that of the second heat absorbing element, so as to realize non-uniform heat absorption of the heat absorbing layer 12. The heat absorbing performance of the middle area 13 corresponding to more heat accumulation is large, so as to better exert its heat absorption effect and improve the effect of suppressing heat spread.

[0054] Optionally, the width of the first heat absorbing member is greater than the width of the second heat absorbing member from the middle region 13 to the edge region 18. In this case, the heat absorbing area of ​​the first heat absorbing member is larger than that of the second heat absorbing member from the middle region 13 to the edge region 18, so that the heat absorbing performance of the first heat absorbing member is greater than that of the second heat absorbing member.

[0055] Optionally, when the first heat absorbing member and the second heat absorbing member are made of the same material, the thickness of the first heat absorbing member is greater than the thickness of the second heat absorbing member along the thickness direction of the heat insulating layer 15. At this time, from the middle area 13 to the edge area 18, the volume of the first heat absorbing member is greater than the volume of the second heat absorbing member, so that the heat absorption performance of the first heat absorbing member is greater than the heat absorption performance of the second heat absorbing member.

[0056] Optional, see Figure 3 As shown, the heat absorbing member 10 is annular in structure; from the middle area 13 to the edge area 18, a plurality of heat absorbing members 10 are sequentially sleeved and arranged at intervals.

[0057] In the above structure of the embodiment of the present application, two adjacent heat absorbing members 10 are arranged at intervals, and the two adjacent heat absorbing members 10 do not affect each other, that is, do not affect the heat absorption effect, thereby ensuring the heat absorption effect of the heat absorbing members 10. In addition, from the middle area 13 to the edge area 18, the plurality of heat absorbing members 10 form an outwardly diffused layout, which can achieve that the heat absorption performance of the middle area 13 is greater than that of the edge area 18.

[0058] In the embodiment of the present application, the number and width distribution of the heat absorption components 10 from the middle area 13 to the edge area 18 need to satisfy the heat absorption distribution law of the middle area 13 and the edge area 18, that is, the heat absorption performance of the middle area 13 is greater than the heat absorption performance of the edge area 18.

[0059] Optional, see Figure 3 As shown, the radial widths of the plurality of heat absorbing members 10 decrease successively from the middle region 13 to the edge region 18. That is, the heat absorbing area of ​​the heat absorbing layer decreases successively from the middle region 13 to the edge region 18, so that the heat absorbing performance of the plurality of heat absorbing members 10 decreases successively.

[0060] Optionally, the heat absorbing member 10 includes at least two sub-heat absorbing members, which are arranged in sequence and enclosed to form a ring structure. In the above structure of the embodiment of the present application, mutual influence between two adjacent sub-heat absorbing members can be avoided, thereby ensuring the heat absorption effect of the heat absorbing member 10.

[0061] It is understandable that the specific shape of the annular structure can be set according to usage requirements, and the embodiments of the present application do not specifically limit this. For example, the annular structure is at least one of a circular ring structure, an elliptical ring structure, a diamond ring structure, and a rectangular ring structure.

[0062] Optionally, the activation energy of the material of the first heat sink is lower than the activation energy of the material of the second heat sink.

[0063] The activation energy of a material refers to the energy required to cause crystal atoms to move from an equilibrium position to another new equilibrium or non-equilibrium position. If the activation energy of the material of the first heat absorbing component is lower than the activation energy of the material of the second heat absorbing component, the heat absorption performance of the first heat absorbing component is greater than the heat absorption performance of the second heat absorbing component.

[0064] Optionally, an absolute value of a phase change enthalpy of the material of the first heat absorption member is higher than an absolute value of a phase change enthalpy of the material of the second heat absorption member.

[0065] The phase change enthalpy of a material refers to the heat absorbed or released by a substance during a phase change process under isothermal and isobaric conditions and without non-volume work, indicating the thermal effect generated when a certain amount of a substance changes from one phase to another at a certain temperature. If the absolute value of the phase change enthalpy of the material of the first heat absorbing element is higher than the absolute value of the phase change enthalpy of the material of the second heat absorbing element, the heat absorption performance of the first heat absorbing element is higher than that of the second heat absorbing element.

[0066] In the embodiment of the present application, when the activation energy of the material of the first heat absorption component is lower than the activation energy of the material of the second heat absorption component, and the absolute value of the phase change enthalpy value of the material of the first heat absorption component is higher than the absolute value of the phase change enthalpy value of the material of the second heat absorption component, the heat absorption performance of the first heat absorption component is greater than the heat absorption performance of the second heat absorption component.

[0067] Optional, see Figure 4 As shown, the heat absorption layer 12 is further provided with a transition area 14, and the transition area 14 is provided between the middle area 13 and the edge area 18; the heat absorption performance of the middle area 13, the transition area 14, and the edge area 18 decreases successively, so that the heat absorption layer 12 can absorb heat more effectively according to the heat distribution characteristics of the battery, and avoid the heat absorption layer 12 with higher heat being quickly consumed, which affects the effect of suppressing heat spread.

[0068] Optionally, in a specific embodiment, refer to Figure 4 As shown, one side of the heat insulating layer 15 along its thickness direction is a heat absorbing surface, and the heat absorbing surface has two opposite long sides and two short sides, the length of the long side is b, the length of the short side is a, and the heat absorbing surface is 1 A circular area is formed on the heat absorption surface with a radius of 0.33a and a middle area 13 corresponding to the circular area. A first elliptical area is formed on the heat absorption surface with a short semi-axis of 0.33a and a long semi-axis of (3×b / a-1) / 6×a. The midpoint of the line connecting the two foci of the first elliptical area coincides with the center of the heat absorption surface. The transition area 14 corresponds to the area of ​​the first elliptical area excluding the circular area. The area of ​​the heat absorption layer 12 except the middle area 13 and the transition area 14 is the edge area 18.

[0069] Optionally, in another specific embodiment, one side of the heat insulation layer 15 along the thickness direction is a heat absorption surface, and the heat absorption surface has two opposite long sides and two short sides, the length of the long side is b, and the length of the short side is a, and when 4≤b / a<50: with the short semi-axis being 0.5a and the long semi-axis being 0.2b, a second elliptical area is formed on the heat absorption surface, the midpoint of the line connecting the two foci of the second elliptical area coincides with the center of the heat absorption surface, and the middle area 13 corresponds to the second elliptical area; with the short semi-axis being 0.75a and the long semi-axis being 0.25b, a third elliptical area is formed on the heat absorption surface, the midpoint of the line connecting the two foci of the third elliptical area coincides with the center of the heat absorption surface, and the transition area 14 corresponds to the area of ​​the third elliptical area excluding the second elliptical area; the area of ​​the heat absorption layer 12 excluding the middle area 13 and the transition area 14 is the edge area 18.

[0070] The inventors have found through research that in actual applications of the heat-resistant protective structure, there is significant unevenness in the temperature on the heat-absorbing surface of the heat-insulating layer 15, with the highest temperature in the middle of the heat-absorbing surface and the lowest temperature at the edge. By partitioning the heat-absorbing surface in the above manner and corresponding the partitions to the heat-absorbing layer 12, a reasonable distribution of the middle area 13, the transition area 14, and the edge area 18 on the heat-absorbing layer 12 can be achieved, so that the heat-absorbing layer 12 can absorb heat more effectively according to the heat distribution characteristics of the battery.

[0071] Optionally, in one embodiment, referring to​ Figure 2 As shown, the heat absorption layer 12 is provided as a single layer, and the heat absorption layer 12 is provided in the middle of the heat absorption layer 12 .

[0072] Optionally, in another embodiment, the heat absorption layer 12 is provided with at least two layers, and the at least two layers of heat absorption layers 12 are stacked and arranged at intervals along the thickness direction of the heat insulation layer 15. Figure 5 As shown, the heat absorption layer 12 is provided with three layers, and the three layers of heat absorption layers 12 are stacked at intervals along the thickness direction of the heat insulation layer 15 .

[0073] In the embodiment of the present application, the heat-resistant protective structure can set the number of layers of the heat-absorbing layer 12 according to the use requirements, and the heat-resistant protective structure is more flexible in designing the heat-absorbing performance and selecting the materials in the heat-absorbing layer. Moreover, when at least two layers of heat-absorbing layers 12 are set in the heat-insulating layer 15, the heat-absorbing layers 12 are isolated from each other and do not affect each other. In the tangential direction of heat transfer, multiple layers of heat-blocking heat-absorbing layers 12 can be designed according to the temperature gradient, which can better achieve the effect of heat absorption and cooling.

[0074] Optionally, the thickness of the heat absorption layer 12 is 0.01 mm-1.5 mm along the thickness direction of the heat insulation layer 15. It can be understood that the thickness of the heat absorption layer 12 is not specifically limited in the embodiment of the present application. For example, the thickness of the heat absorption layer 12 is 0.01 mm, 0.02 mm, 0.05 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.755 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm.

[0075] Optionally, along the thickness direction of the heat insulation layer 15, the thickness of the heat insulation layer 15 is 1mm-10mm. It can be understood that the embodiment of the present application does not specifically limit the thickness of the heat absorption layer 12. For example, the thickness of the heat insulation layer 15 is 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, and 10mm.

[0076] Optionally, the heat insulation layer 15 is made of aerogel material. Since aerogel material has extremely low thermal conductivity and excellent heat insulation performance, and also has low thermal conductivity, low density, high strength and stability, and is flame retardant, it is suitable for use in heat-resistant protective structures.

[0077] The embodiments of the present application do not specifically limit the aerogel material, and the aerogel material can be selected according to the use requirements. For example, the aerogel material includes at least one of inorganic aerogel, organic aerogel, carbon aerogel, natural gas gel, and carbide aerogel.

[0078] Optionally, the embodiment of the present application does not specifically limit the material of the heat absorbing element 10, and it can be selected according to the use requirements. For example, the heat absorbing element 10 is made of at least one of a phase change material and a chemical heat storage material. Since different materials have different phase change temperatures, the embodiment of the present application can use the heat absorption characteristics of these materials to achieve homogenization under different temperature gradients on the same plane, and at the same time can reduce the amount of material to a certain extent and reduce the thickness and cost of the heat absorption layer. And by placing different types of heat absorbing materials and heat absorbing materials of different masses at positions with different temperature gradient ranges on the same plane, the heat absorption characteristics and volume of each material are used to achieve a non-uniform distribution of heat absorption performance.

[0079] Optionally, the phase change material includes at least one of a hydrated salt phase change material, an organic phase change material, a molten salt phase change material, a metal phase change material, and an alloy phase change material.

[0080] Furthermore, the phase change material includes an organic phase change material and an inorganic phase change material, and the heat absorption element 10 can be made of at least one of an organic phase change material, an inorganic phase change material, and a chemical heat storage material.

[0081] Optionally, the embodiments of the present application do not specifically limit the organic phase change material. For example, the organic phase change material includes: glycolic acid, p-bromophenol, azobenzene, acrylic acid, 2,4-dinitrotoluene, phenylacetic acid, allyl thiourea, D-3 camphor balls, benamine, tetramethylbenzene, acetamide, methyl p-bromobenzoate, 1-naphthol, glutaric acid, dichlorop-xylene, methyl fumarate, catechol, quinone, acetanilide, erythritol, succinic anhydride, benzoic acid, stilbene compounds, benzamide, phenacetin, p-aminotoluene, benzaldehyde phenylhydrazone, salicylic acid, phenylanilide, D-mannitol sugar, hydroquinone, p-aminobenzoic acid, etc.

[0082] Optionally, the embodiment of the present application does not specifically limit the hydrated salt phase change material, and the hydrated salt phase change material includes lithium chlorate trihydrate (LiClO3·3H2O), sodium sulfate ammonium chloride decahydrate (NH4Cl·Na2SO4·10H2O), potassium dihydrogen phosphate hexahydrate (K2HPO4·6H2O), sodium sulfate sodium chloride decahydrate (NaCl·Na2SO4·10H2O), potassium fluoride tetrahydrate (KF·4H2O), potassium dihydrogen phosphate tetrahydrate (K2HPO4·4H2O), iron bromide hexahydrate (FeBr3·6H2O), manganese nitrate hexahydrate (Mn(NO3)2·6H2O), lithium borate octahydrate (LiBO2·8H2O), calcium chloride hexahydrate (CaCl2·6H2O), calcium chloride dodecahydrate (CaCl2·12H2O), lithium nitrate trihydrate (LiNO3·3H2O), lithium nitrate dihydrate (LiNO3·2H2O), sodium sulfate decahydrate (Na2SO4·10H2O), sodium carbonate decahydrate (Na2CO3·10H2O), potassium iron sulfate dodecahydrate (KFe(SO4)2·12H2O), calcium bromide hexahydrate (CaBr2·6H2O), lithium bromide dihydrate (LiBr·2H2O), disodium hydrogen phosphate dodecahydrate (Na2HPO4·12H2O), zinc nitrate hexahydrate (Zn(NO3)2·6H2O), nitrate Manganese dioxide tetrahydrate (Mn(NO3)2·4H2O), ferric chloride hexahydrate (FeCl3·6H2O), calcium chloride tetrahydrate (CaCl2·4H2O), copper sulfate heptahydrate (CuSO4·7H2O), potassium fluoride dihydrate (KF·2H2O), magnesium iodide octahydrate (MgI2·8H2O), calcium iodide hexahydrate (CaI2·6H2O), calcium nitrate tetrahydrate (Ca(NO3)2·4H2O), zinc nitrate tetrahydrate (Zn(NO3)2·4H2O), tripotassium phosphate heptahydrate (K3PO4·7H2O), potassium dihydrogen phosphate heptahydrate (K2HPO4·7H2O), ferric nitrate nonahydrate (Fe(NO3)3·9H2O )、Magnesium nitrate tetrahydrate (Mg(NO3)2·4H2O), Sodium silicate pentahydrate (Na2SiO3·5H2O), Sodium silicate tetrahydrate (Na2SiO3·4H2O), Disodium hydrogen phosphate heptahydrate (Na2HPO4·7H2O), Sodium thiosulfate pentahydrate (Na2S2O3·5H2O), Potassium dihydrogen phosphate trihydrate (K2HPO4·3H2O), Magnesium sulfate heptahydrate (MgSO4·7H2O), Calcium nitrate trihydrate (Ca(NO3)2·3H2O), Sodium nitrate hexahydrate (Na(NO3)2·6H2O), Zinc nitrate dihydrate (Zn(NO3)2·2H2O), Ferric chloride dihydrate (FeCl3·2H2O) 、Cobalt nitrate hexahydrate (Co(NO3)2·6H2O), Nickel nitrate hexahydrate (Ni(NO3)2·6H2O), Manganese chloride tetrahydrate (MnCl2·4H2O), Sodium acetate trihydrate (CH3COONa·3H2O), Lithium acetate dihydrate (LiC2H3O2·2H2O), Magnesium chloride tetrahydrate (MgCl2·4H2O), Sodium hydroxide hydrate (NaOH·H2O), Cadmium nitrate tetrahydrate (Cd(NO3)2·4H2O), Cadmium nitrate monohydrate (Cd(NO3)2·H2O), Ferrous nitrate hexahydrate (Fe(NO3)2·6H2O), Sodium aluminum sulfate dodecahydrate (NaAl(SO4)2·12H2O),Sodium aluminum sulfate decahydrate (NaAl(SO4)2·10H2O), ferrous sulfate heptahydrate (FeSO4·7H2O), trisodium phosphate dodecahydrate (Na3PO4·12H2O), lithium acetate dihydrate (LiCH3COO·2H2O), disodium phosphate decahydrate (Na2P2O7·10H2O), aluminum nitrate nonahydrate (Al(NO3)2·9H2O), barium hydroxide octahydrate (Ba(OH)2·8H2O), aluminum sulfate octahydrate (Al 2(SO4)3·18H2O), strontium hydroxide octahydrate (Sr(OH)2·8H2O), magnesium nitrate hexahydrate (Mg(NO3)2·6H2O), potassium aluminum sulfate dodecahydrate (KAl(SO4)2·12H2O), ammonium aluminum sulfate hexahydrate ((NH4)Al(SO4)·6H2O), lithium chloride hydrate (LiCl·H2O), magnesium chloride hexahydrate (MgCl2·6H2O), etc., as well as any proportion of the above phase change materials or a single phase change material.

[0083] Optionally, the embodiments of the present application do not specifically limit the molten salt phase change material, and the molten salt phase change material includes lithium nitrate / potassium chloride (LiNO3 / KCl), lithium nitrate / sodium nitrate (LiNO3 / NaNO3), potassium nitrate / sodium nitrate (KNO3 / NaNO3), lithium nitrate / sodium chloride (LiNO3 / NaCl), sodium nitrate / potassium nitrate (NaNO3 / KNO3), lithium nitrate / diatomaceous earth (LiNO / diatomaceous earth), sodium nitrate / copper oxide (NaNO3 / CuO), sodium nitrate / epoxy resin (NaNO3 / EP), potassium nitrate / diatomaceous earth (KNO3 / diatomaceous earth), lithium carbonate / sodium carbonate / potassium carbonate (Li2CO3 / Na2CO3 / K2CO3), sodium chloride / Calcium chloride / magnesium chloride (NaCl / CaCl2 / MgCl2), magnesium chloride / sodium chloride (MgCl2 / NaCl), magnesium chloride / potassium chloride (MgCl2 / KCl), lithium carbonate / potassium carbonate (Li2CO3 / K2CO3), lithium carbonate / potassium carbonate (LiCO3 / K2CO3), sodium carbonate / lithium carbonate (Na2CO3 / Li2CO3), sodium chloride / sodium carbonate (NaCl / Na2CO3), sodium carbonate / sodium chloride (Na2CO3 / NaCl), sodium sulfate / diatomaceous earth (Na2SO4 / diatomaceous earth), sodium sulfate / silicon carbide ceramic foam (Na2SO4 / SiC ceramic foam), etc., as well as any proportion of the above phase change materials mixed or a single phase change material.

[0084] Optionally, the embodiment of the present application does not specifically limit the chemical heat storage material, and the chemical heat storage material includes at least one of nickel hydroxide (Ni(OH)2), magnesium hydroxide (Mg(OH)2), magnesium hydride (MgH2), cobalt tetroxide (Co3O4), lead carbonate (PbCO3), ammonium bisulfate (NH4HSO4), calcium hydroxide (Ca(OH)2), strontium hydroxide (Sr(OH)2), calcium carbonate (CaCO3), barium peroxide (BaO2), and barium hydroxide (Ba(OH)2).

[0085] Optionally, along the thickness direction of the heat insulation layer 15, a radiation blocking layer 16 is provided on the surface of at least one side of the heat insulation layer 15. The radiation blocking layer 16 can be used to block the transfer of heat.

[0086] Reference Figure 1 As shown, along the thickness direction of the heat insulation layer 15, radiation blocking layers 16 are respectively provided on two opposite sides of the heat insulation layer 15.

[0087] Optionally, the thickness of the radiation blocking layer 16 is 0.1 mm-1 mm. It is understandable that the thickness of the radiation blocking layer 16 is not specifically limited in the embodiment of the present application. For example, the thickness of the radiation blocking layer 16 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1 mm.

[0088] Optionally, the radiation blocking layer 16 is at least one of a radiation blocking material and a reflective heat insulating material.

[0089] The radiation blocking material is used to reduce the heat transferred by radiation. The present application embodiment does not specifically limit the radiation blocking material. For example, the radiation blocking material includes carbon black, silicon carbide (SiC), potassium hexatitanate whiskers K2Ti6O 13 , titanium dioxide (TiO2), zirconium dioxide (ZrO2), aluminum oxide (Al2O3), fly ash, inverse spinel metal oxide high-radiation thermal insulation materials, etc.

[0090] Reflective insulation materials are materials that use a high reflectivity surface to reduce heat conduction and convection. The present application embodiment does not specifically limit the reflective insulation material, for example, the reflective insulation material includes titanium dioxide (TiO2), glass beads, aluminum powder, aluminum oxide (Al2O3), etc., and a reflective coating made of a mixture of the above reflective materials and resin, a copper (Cu) layer, a silver (Ag) layer, an aluminum (Al) layer, etc.

[0091] In a specific embodiment, the heat-resistant protection structure refers to Figures 1 to 3As shown, the heat-resistant protective structure includes a heat-insulating layer 15, two radiation-blocking layers 16, and a heat-absorbing layer 12 formed by a plurality of heat-absorbing elements 10. Along the thickness direction of the heat-insulating layer 15, the opposite side surfaces of the heat-insulating layer 15 are respectively connected to the radiation-blocking layer 16 by bonding or the like. A plurality of heat-absorbing elements 10 are respectively embedded in the heat-insulating layer 15. The heat-absorbing layer 12 is selected from the corresponding material types (including phase change materials and chemical heat storage materials) according to the temperature of the heat source and the environment, and the safe temperature to be maintained, as well as the distribution positions of the heat-absorbing elements 10.

[0092] The selection and dosage of phase change materials and chemical heat storage materials in the heat absorption layer 12 are, for example, that the temperature in the middle area 13 is higher, and more heat needs to be taken away more quickly. In this middle area 13, materials with lower activation energy and higher absolute values ​​of phase change enthalpy are used, or the content of the materials is increased, or a combination of multiple materials is used to absorb heat. The transition area 14 requires a relatively longer time to induce thermal runaway, so a phase change material with higher activation energy and moderate enthalpy can be used. The temperature of the edge area 18 can be reduced by natural heat dissipation, so a small amount of material is used in the edge area 18 to save costs.

[0093] When using the heat-resistant protective structure, it is installed between the batteries of the battery module. When one or more batteries in the battery module are in thermal runaway, the higher thermal radiation heat is first blocked by the radiation-blocking layer 16 of the heat-resistant protective structure, and the heat entering the heat-resistant protective structure through heat conduction is blocked by one side of the heat-insulating layer 15, and finally the heat is taken away by the heat-absorbing material of the heat-absorbing layer 12, thereby delaying the heat spread of the battery itself and reducing the temperature of the battery on the spread side.

[0094] The inventors studied the differences between the heat-resistant protective structure b and the heat-absorbing layer uniformly arranged structure (the heat-absorbing layer uniformly arranged structure includes a stacked heat-absorbing layer d and two heat-insulating layers c, and the heat-absorbing layer d is arranged between the two heat-insulating layers c) of the embodiment of the present application through COMSOL simulation (multi-physics field simulation). The heated surface of the heat-resistant protective structure b and the heated surface of the heat-absorbing layer uniformly arranged structure are respectively connected to the heat source a, and the temperatures of the non-heated surface of the heat-resistant protective structure b and the non-heated surface of the heat-absorbing layer uniformly arranged structure are studied.

[0095] Embodiment 1:

[0096] Simulation conditions:

[0097] Under constant heat source, the total thickness of the heat-resistant protection structure b is the same as the total thickness of the heat-absorbing layer uniformly set structure (for example, the total thickness is 2.0mm), the mass of the heat-absorbing material used is the same, and the heating time is the same. Study the average temperature and center temperature of the non-heated surface. Figure 7 and Figure 8As shown, compared with the existing uniformly arranged heat absorption layer structure, the maximum temperature at the center of the heat-resistant protection structure of the embodiment of the present application is 40°C lower than the center temperature of the uniformly arranged heat absorption layer structure, and the average temperature of the entire plane of the non-heated surface is 18°C ​​lower.

[0098] The COMSOL simulation results show that the total thickness of the heat-resistant protection structure b is the same as the total thickness of the uniformly arranged structure of the heat-absorbing layer, and the quality of the heat-absorbing material used is the same. The heat-resistant protection structure of the embodiment of the present application has better heat absorption effect, ensuring that the battery connected to the heat-resistant protection structure can continue to be in a uniform and low temperature state.

[0099] Embodiment 2

[0100] Simulation conditions: The thickness difference between the heat-resistant protection structure b and the heat-absorbing layer uniformly arranged structure is studied to achieve the same heat insulation effect. Fig. 9 and Fig.10 As shown, under the condition of achieving basically the same thermal insulation effect, the thickness of the heat-resistant protection structure b is 0.8 mm lower than that of the structure with uniformly arranged heat-absorbing layer, and the weight of the heat-absorbing material is reduced by 11 g.

[0101] The COMSOL simulation results show that when the heat-resistant protection structure b and the heat-absorbing layer are evenly arranged to achieve the same thermal insulation effect, the heat-resistant protection structure b is thinner and the heat-absorbing material weighs less, thereby saving material costs.

[0102] The embodiment of the present application also discloses a battery module, which includes a plurality of batteries and the heat-resistant protection structure as described above; the heat-resistant protection structure is arranged between two adjacent batteries.

[0103] The heat absorption performance of the heat absorption layer 12 in the heat-resistant protection structure of the battery module is non-uniformly distributed, corresponding to the temperature distribution on the heat dissipation surface of the battery, that is, the heat absorption performance of the middle area 13 of the heat absorption layer 12 with higher heat is large, and the heat absorption performance of the edge area 18 with lower heat is small, thereby better exerting its heat absorption effect and avoiding the high-heat part from being quickly consumed, improving the effect of suppressing heat spread, and ensuring that the battery connected to the heat-resistant protection structure can continue to be at a uniform and low temperature.

[0104] The embodiment of the present application also discloses an electrical device, which includes a device body and a battery module as described above, wherein the device body is electrically connected to the battery module.

[0105] The electrical equipment may be a vehicle, an energy storage device, such as a mobile energy storage power supply, or a mobile terminal, such as a mobile phone, a camera, or other electronic device. Of course, the above are only examples of electrical equipment and are not intended to be limiting of this application. In actual applications, appropriate electrical equipment may be selected as needed.

[0106] It should be noted that in the embodiment of the present application, the battery module included in the electrical equipment has the same structure as the battery module described in the above embodiment, and its beneficial effects are also similar, which will not be repeated here.

[0107] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0108] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0109] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A heat-resistant protective structure, characterized in that: The heat-resistant protective structure comprises a heat-absorbing layer (12); The heat absorption layer (12) comprises a middle region (13) and an edge region (18) arranged around the middle region (13), and the heat absorption performance of the middle region (13) is greater than the heat absorption performance of the edge region (18); One side of the heat-resistant protective structure along the thickness direction is a heat-absorbing surface, and the heat-absorbing surface has two opposite long sides and two short sides, the length of the long side is b, and the length of the short side is a. When 1 is 4≤b / a<50: Take the center of the heat absorbing surface as the circle point, is a radius, forming a circular area on the heat absorption surface, and the middle area (13) corresponds to the circular area; With the minor semi-axis being 0.5a and the major semi-axis being 0.2b, a second elliptical area is formed on the heat absorbing surface, the midpoint of the line connecting the two foci of the second elliptical area coincides with the center of the heat absorbing surface, and the middle area (13) corresponds to the second elliptical area. The heat-resistant protective structure further comprises a heat-insulating layer (15), and the heat-absorbing layer (12) is embedded in the heat-insulating layer (15).

2. The heat-resistant protective structure according to claim 1, characterized in that: The heat-resistant protective structure comprises a plurality of heat-absorbing components (10), wherein the plurality of heat-absorbing components (10) are respectively embedded in the heat-insulating layer (15) to form the heat-absorbing layer (12), the heat-absorbing components (10) located in the middle area (13) are first heat-absorbing components, and the heat-absorbing components (10) located in the edge area (18) are second heat-absorbing components, and the heat-absorbing performance of the first heat-absorbing components is greater than the heat-absorbing performance of the second heat-absorbing components.

3. The heat-resistant protective structure according to claim 2, characterized in that: From the middle area (13) to the edge area (18), the width of the first heat absorbing member is greater than the width of the second heat absorbing member.

4. The heat-resistant protective structure according to claim 3, characterized in that: When the first heat absorbing member and the second heat absorbing member are made of the same material, along the thickness direction of the heat-resistant protection structure, the thickness of the first heat absorbing member is greater than the thickness of the second heat absorbing member.

5. The heat-resistant protective structure according to claim 3, characterized in that: The heat absorbing component (10) is in an annular structure; from the middle area (13) to the edge area (18), a plurality of the heat absorbing components (10) are sequentially sleeved and arranged at intervals.

6. The heat-resistant protective structure according to claim 3, characterized in that: From the middle area (13) to the edge area (18), the radial widths of the plurality of heat absorbing components (10) decrease in sequence.

7. The heat-resistant protective structure according to claim 6, characterized in that: The heat absorbing member (10) comprises at least two sub-heat absorbing members, and the at least two sub-heat absorbing members are arranged in sequence at intervals and enclosed to form the annular structure.

8. The heat-resistant protective structure according to claim 6, characterized in that: The annular structure is in the shape of at least one of a circular ring, an elliptical ring, a diamond ring, and a rectangular ring.

9. The heat-resistant protective structure according to claim 6, characterized in that: The activation energy of the material of the first heat absorption member is lower than the activation energy of the material of the second heat absorption member, and / or the absolute value of the phase change enthalpy of the material of the first heat absorption member is higher than the absolute value of the phase change enthalpy of the material of the second heat absorption member.

10. The heat-resistant protective structure according to claim 3, characterized in that: The heat absorption layer (12) is further provided with a transition region (14), wherein the transition region (14) is provided between the middle region (13) and the edge region (18); the heat absorption performance of the middle region (13), the transition region (14), and the edge region (18) decreases in sequence.

11. The heat-resistant protective structure according to claim 1, characterized in that:

12. The heat-resistant protective structure according to claim 11, characterized in that: ​ With a minor semi-axis of 0.33a and a major semi-axis of (3×b / a-1) / 6×a, a first elliptical region is formed on the heat absorption surface, the midpoint of a line connecting two foci of the first elliptical region coincides with the center of the heat absorption surface, and the transition region (14) corresponds to the region of the first elliptical region excluding the circular region; The area of ​​the heat absorption layer (12) other than the middle area (13) and the transition area (14) is the edge area (18).

13. The heat-resistant protective structure according to claim 11, characterized in that: With the minor semi-axis being 0.75a and the major semi-axis being 0.25b, a third elliptical area is formed on the heat absorbing surface, the midpoint of the line connecting the two foci of the third elliptical area coincides with the center of the heat absorbing surface, and the transition area (14) corresponds to the area of ​​the third elliptical area excluding the second elliptical area; The area of ​​the heat absorption layer (12) other than the middle area (13) and the transition area (14) is the edge area (18).

14. The heat-resistant protective structure according to claim 1, characterized in that: The heat absorption layer (12) is provided as a single layer; and / or the heat absorption layer (12) is provided as at least two layers, and the at least two layers of the heat absorption layer (12) are stacked and arranged at intervals along the thickness direction of the heat-resistant protective structure.

15. The heat-resistant protective structure according to claim 2, characterized in that: Along the thickness direction of the heat-resistant protective structure, the thickness of the heat-absorbing layer (12) is 0.01 mm-1.5 mm; and / or the thickness of the heat-insulating layer (15) is 1 mm-10 mm; and / or the heat-insulating layer (15) is made of aerogel material.

16. The heat-resistant protective structure according to any one of claims 3 to 10, characterized in that: The heat absorbing element (10) is made of at least one of a phase change material and a chemical heat storage material.

17. The heat-resistant protective structure according to claim 16, characterized in that: The phase change material includes at least one of a hydrated salt phase change material, an organic phase change material, a molten salt phase change material, a metal phase change material, and an alloy phase change material.

18. The heat-resistant protective structure according to claim 16, characterized in that: The chemical heat storage material includes at least one of nickel hydroxide, magnesium hydroxide, magnesium hydride, cobalt tetraoxide, lead carbonate, ammonium hydrogen sulfate, calcium hydroxide, strontium hydroxide, calcium carbonate, barium peroxide, and barium hydroxide.

19. The heat-resistant protective structure according to claim 2, characterized in that: Along the thickness direction of the heat-resistant protective structure, a radiation-blocking layer (16) is provided on the surface of at least one side of the heat-insulating layer (15).

20. The heat-resistant protective structure according to claim 19, characterized in that: The thickness of the radiation blocking layer (16) is 0.1 mm-1 mm; and / or, The radiation blocking layer (16) is made of at least one of a radiation blocking material and a reflective heat insulating material.

21. A battery module, characterized in that: The battery module comprises a plurality of batteries and a heat-resistant protective structure as described in any one of claims 1 to 20; the heat-resistant protective structure is arranged between two adjacent batteries.

22. An electrical equipment, characterized in that: The electrical device comprises a device body and a battery module as claimed in claim 21, and the device body is electrically connected to the battery module.

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