Composite thermal insulation pad, battery, and electric device

Abstract

The present application relates to a composite thermal insulation pad, a battery, and an electric device. The composite thermal insulation pad comprises: a composite phase-change layer, comprising a phase-change material layer and an encapsulation layer, the encapsulation layer being arranged on the outer peripheral side of the phase-change material layer; and an outer thermal insulation layer, arranged on at least one side of the outer peripheral side of the encapsulation layer. The composite thermal insulation pad exhibits good thermal insulation performance; and when applied in batteries, the composite thermal insulation pad has a good effect in retarding thermal runaway of the batteries.

Description

Composite thermal insulation pads, batteries and electrical devices

[0001] Related applications

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on February 8, 2024, with application number 2024202901853, entitled "Composite thermal insulation pad, battery and electrical device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a composite thermal insulation pad, a battery, and an electrical device. Background Art

[0004] With the development of new energy technologies, batteries are increasingly being used in the market, and people's requirements for battery performance are also increasing, such as the demand for energy density. However, battery cells with higher energy density have large residual energy after thermal runaway. When a battery cell thermally runs away, the heat from one battery cell will continue to transfer to adjacent battery cells, causing heat diffusion throughout the battery and causing damage to the entire battery. Therefore, how to mitigate battery thermal runaway is an urgent problem that needs to be solved.

[0005] Summary of the Invention

[0006] Based on this, it is necessary to provide a composite thermal insulation pad, battery and electrical device to prevent the problem of battery thermal runaway.

[0007] In a first aspect, the present application provides a composite thermal insulation pad, comprising:

[0008] a composite phase change layer, comprising a phase change material layer and an encapsulation layer, wherein the encapsulation layer is disposed on the outer periphery of the phase change material layer; and

[0009] The outer heat insulating layer is provided on at least one side of the outer periphery of the packaging layer.

[0010] The above-mentioned composite thermal insulation pad of the present application, on the one hand, the outer thermal insulation layer is arranged on at least one side of the outer peripheral side of the packaging layer, and the phase change material layer in the packaging layer can absorb the heat transferred from the outer thermal insulation layer to play a thermal insulation role. On the other hand, the packaging layer is arranged on the outer peripheral side of the phase change material layer to form a composite phase change layer, so that the phase change material layer in the composite phase change layer is physically isolated from the outer thermal insulation layer, and thus before the packaging layer fails, the phase change material will not diffuse into the inner part of the outer thermal insulation layer to form a heat conduction path, and thus will not change the structure of the outer thermal insulation layer and its thermal insulation performance. In this way, the above-mentioned composite thermal insulation pad has better thermal insulation performance. When applied to batteries, it has a good effect of preventing battery thermal runaway.

[0011] Traditional technologies, due to structural limitations, can only use solid phase change materials, which, however, have limited heat absorption capacity. The aforementioned composite thermal insulation pad, with its phase change material layer located within the packaging cavity of the packaging layer, is physically isolated from the insulation layers on either side. Therefore, the phase change material in the phase change material layer can be solid, liquid, or a solid-liquid hybrid. This provides a wider range of applications, and the use of liquid phase change materials offers greater heat absorption capacity, thus providing better thermal insulation performance.

[0012] In some embodiments, the outer heat insulation layer is provided on at least one of two sides of the composite phase change layer in a thickness direction.

[0013] In some embodiments, the outer thermal insulation layer includes a first thermal insulation layer and a second thermal insulation layer;

[0014] The first thermal insulation layer and the second thermal insulation layer are respectively arranged on both sides of the composite phase change layer in a thickness direction, so that the composite phase change layer is sandwiched between the first thermal insulation layer and the second thermal insulation layer.

[0015] On the one hand, the composite thermal insulation pad is provided with a first thermal insulation layer and a second thermal insulation layer at the same time, which can play a good thermal insulation role; on the other hand, the composite phase change layer is provided between the first thermal insulation layer and the second thermal insulation layer, and the composite phase change layer can absorb the heat transferred from the thermal insulation layers on both sides, thereby further improving the thermal insulation performance of the above-mentioned composite thermal insulation pad.

[0016] In some embodiments, edges of the first thermal insulation layer and the second thermal insulation layer are connected to each other to form an assembly cavity, and the composite phase change layer is located in the assembly cavity.

[0017] In some embodiments, an edge of at least one side surface of at least one of the first thermal insulation layer and the second thermal insulation layer forms a convex portion, and the convex portion encloses and forms at least a portion of the assembly cavity.

[0018] In some embodiments, the packaging layer has a packaging margin portion, and the packaging margin portion is folded and located in the assembly cavity.

[0019] In some embodiments, the composite thermal insulation pad also includes a first packaging frame and a second packaging frame, the first packaging frame is arranged on one side of the first thermal insulation layer, and the second packaging frame is arranged on one side of the second thermal insulation layer, and the first packaging frame and the second packaging frame cooperate to fix the first thermal insulation layer, the composite phase change layer and the second thermal insulation layer.

[0020] In some embodiments, the packaging layer has a packaging margin portion, and the packaging margin portion is located between the first packaging frame and the second packaging frame.

[0021] In some embodiments, the first packaging frame has a first limiting groove, the second packaging frame has a second limiting groove, and the first thermal insulation layer, the composite phase change layer and the second thermal insulation layer are limited in the limiting space formed by the first limiting groove and the second limiting groove.

[0022] In some embodiments, the outer surface of the first thermal insulation layer is flush with the outer surface of the first packaging frame, and / or the outer surface of the second thermal insulation layer is flush with the outer surface of the second packaging frame.

[0023] In some embodiments, the length and width dimensions of the outer thermal insulation layer are respectively adapted to the length and width dimensions of the composite phase change layer; or, at least one of the length and width dimensions of the outer thermal insulation layer is larger than the corresponding length or width dimension of the composite phase change layer.

[0024] In some embodiments, the composite thermal insulation pad meets at least one of the following conditions:

[0025] (1) The composite thermal insulation pad further includes an adhesive layer, and the outer thermal insulation layer and the encapsulation layer are connected via the adhesive layer;

[0026] (2) The composite thermal insulation pad also includes a release adhesive layer, and the release adhesive layer includes an adhesive layer and a release film. The third adhesive layer is arranged on the outer surface of the outer thermal insulation layer, and the release film is arranged on the outer surface of the adhesive layer.

[0027] In some embodiments, the composite thermal insulation pad meets at least one of the following conditions:

[0028] (1) The outer thermal insulation layer is a ceramic material layer;

[0029] (2) The encapsulation layer is an aluminum-plastic film or a polymer encapsulation film;

[0030] (3) The thickness of the encapsulation layer is 0.1 mm to 0.3 mm;

[0031] (4) The thickness of the composite phase change layer is 1 mm to 6 mm;

[0032] (5) The thickness of the outer insulation layer is 0.5 mm to 8 mm;

[0033] (6) The thickness of the phase change material layer accounts for 70% to 96% of the total thickness of the composite phase change layer;

[0034] (7) The thickness ratio of the composite phase change layer to the outer heat insulation layer is 0.15 to 12:1.

[0035] In some embodiments, the composite thermal insulation pad further includes a third thermal insulation layer, and the composite phase change layer is also provided between the second thermal insulation layer and the third thermal insulation layer.

[0036] In a second aspect, the present application provides a battery comprising the above-mentioned composite thermal insulation pad.

[0037] In some embodiments, a plurality of battery cells are further included, and the composite thermal insulation pad is disposed between at least two adjacent battery cells.

[0038] In some embodiments, the composite thermal insulation pad is disposed between the large surfaces of two adjacent battery cells.

[0039] In a third aspect, the present application provides an electrical device comprising the battery as described above.

[0040] The details of one or more embodiments of the present application are set forth in the following drawings and description. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0042] FIG1 is a schematic diagram of the cross-sectional structure of a composite thermal insulation pad according to one embodiment of the present application;

[0043] FIG2 is a schematic diagram of the cross-sectional structure of a composite thermal insulation pad according to another embodiment of the present application;

[0044] FIG3 is a schematic diagram of the cross-sectional structure of a composite thermal insulation pad according to another embodiment of the present application;

[0045] FIG4 is a schematic diagram of the cross-sectional structure of a composite thermal insulation pad according to another embodiment of the present application;

[0046] FIG5 is a schematic diagram of the three-dimensional structure of a composite thermal insulation pad according to another embodiment of the present application;

[0047] FIG6 is a schematic cross-sectional view of the composite thermal insulation pad shown in FIG5 taken along line AA;

[0048] FIG7 is an exploded cross-sectional view of the composite thermal insulation pad shown in FIG6 ;

[0049] FIG8 is a schematic diagram of the cross-sectional structure of a composite thermal insulation pad according to another embodiment of the present application;

[0050] FIG9 is a schematic structural diagram of a battery according to an embodiment of the present application;

[0051] FIG10 is a schematic diagram of the exploded structure of a battery according to one embodiment of the present application;

[0052] FIG11 is a schematic structural diagram of a battery cell in a battery according to one embodiment;

[0053] FIG12 is a schematic diagram of an electrical device using a battery as a power source according to an embodiment of the present application.

[0054] Description of reference numerals:

[0055] 10. Composite thermal insulation pad; 11. First thermal insulation layer; 12. Second thermal insulation layer; 13. Composite phase change layer; 131. Phase change material layer; 132. Encapsulation layer; 1321. Encapsulation margin; 141. First encapsulation frame; 142. Second encapsulation frame; 151. First adhesive layer; 152. Second adhesive layer; 16. Third thermal insulation layer;

[0056] 20. Battery cell; 21. Housing; 22. Electrode assembly; 23. Cover plate;

[0057] 30. Battery;

[0058] 40. Electrical equipment. DETAILED DESCRIPTION

[0059] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0060] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply 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 this application.

[0061] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0062] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0063] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0064] " range " disclosed in the present application is limited in the form of lower limit and upper limit, and given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of special range. The scope limited in this way can be to include end value or not include end value, and can be arbitrarily combined, that is, any lower limit can form a range with any upper limit combination. For example, if the scope of 60-120 and 80-110 is listed for specific parameters, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range value 1 and 2 are listed, and if the maximum range value 3,4 and 5 are listed, then the following range can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In this application, unless otherwise specified, the numerical range " ab " represents the abbreviation of any real number combination between a and b, wherein a and b are all real numbers. For example, a numerical range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0065] Currently, market developments indicate that batteries are becoming increasingly widely used. Batteries, particularly power batteries, are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in other fields. As the application of power batteries continues to expand, market demand is also growing.

[0066] A battery cell is the smallest unit that makes up a battery. A battery can contain one or more battery cells, and multiple battery cells can be connected in series, parallel, or in a hybrid connection. Hybrid connection refers to multiple battery cells being connected in both series and parallel.

[0067] After multiple battery cells are interconnected and arranged in a certain order, they can be directly placed in a box to form a battery. Alternatively, multiple battery cells can be first assembled into a battery module, and then multiple battery modules are interconnected to form a whole, and finally the entire battery module is placed in a box to form a battery.

[0068] In order to solve the above-mentioned battery thermal runaway problem and reduce the damage and risk to the entire battery.

[0069] Referring to FIG. 1 , one embodiment of the present application provides a composite thermal insulation pad 10 , including a composite phase change layer 13 and an outer thermal insulation layer.

[0070] The composite phase change layer 13 includes a phase change material layer 131 and an encapsulation layer 132 . The encapsulation layer 132 is disposed on the outer periphery of the phase change material layer 131 . The outer heat insulation layer is disposed on at least one side of the outer periphery of the encapsulation layer 132 .

[0071] The above-mentioned composite thermal insulation pad 10, on the one hand, has an outer thermal insulation layer arranged on at least one side of the outer peripheral side of the packaging layer 132, and the phase change material layer 131 in the packaging layer 132 can absorb the heat transferred from the outer thermal insulation layer to play a thermal insulation role. On the other hand, the packaging layer 132 is arranged on the outer peripheral side of the phase change material layer 131 to form a composite phase change layer 13, so that the phase change material layer 131 in the composite phase change layer 13 is physically isolated from the outer thermal insulation layer, and thus before the packaging layer 132 fails, the phase change material will not diffuse into the inner part of the outer thermal insulation layer to form a heat conduction path, and thus will not change the structure of the outer thermal insulation layer and its thermal insulation performance. In this way, the above-mentioned composite thermal insulation pad 10 has better thermal insulation performance. When applied to batteries, it has a good effect of slowing down battery thermal runaway.

[0072] Traditional technology is limited by its structure, and phase change materials can only use solid phase change materials. However, solid phase change materials have limited heat absorption capacity. The above-mentioned composite thermal insulation pad 10, because its phase change material layer 131 is arranged in the packaging cavity of the packaging layer 132, the phase change material layer 131 is physically isolated from the outer thermal insulation layer. Therefore, the phase change material of its phase change material layer 131 can be a solid phase change material, a liquid phase change material, or a solid-liquid mixed phase change material. Optionally, the phase change material includes but is not limited to crystal water and salt, phase change molten salt, paraffin, silicone oil, silica-alumina sol, fatty acids, alcohols and other substances that can undergo phase change and absorb heat. It has a wider range of applications and can therefore provide better thermal insulation performance.

[0073] In addition, because the phase change material of the phase change material layer 131 undergoes phase change, for example, the solid phase change material at room temperature turns into liquid after absorbing heat, the encapsulation layer 132 can also serve to isolate the liquid phase change material after phase change from the outer heat insulation layer.

[0074] In addition, some preparation processes inevitably cause the phase change material to contain moisture. The structure in which the phase change material layer 131 is disposed in the packaging cavity of the packaging layer 132 can prevent moisture overflow from causing adverse effects on the battery.

[0075] Furthermore, the outer heat insulation layer may be provided on at least one of the two sides in the thickness direction of the composite phase change layer 13 .

[0076] For example, the outer heat insulation layer may be provided on one side or two opposite sides of the encapsulation layer 132 in the thickness direction of the composite phase change layer 13 .

[0077] In some embodiments, the above-mentioned outer thermal insulation pad includes a first thermal insulation layer 11 and a second thermal insulation layer 12. The first thermal insulation layer 11 and the second thermal insulation layer 12 are arranged on both sides of the composite phase change layer 13 in the thickness direction, so that the composite phase change layer 13 is sandwiched between the first thermal insulation layer 11 and the second thermal insulation layer 12. In other words, the first thermal insulation layer 11, the composite phase change layer 13 and the second thermal insulation layer 12 are stacked in sequence.

[0078] The encapsulation layer 132 is arranged on the outer peripheral side of the phase change material layer 131 and constitutes an encapsulation cavity, and the phase change material layer 131 is arranged in the encapsulation cavity. Furthermore, the encapsulation cavity is a closed cavity. The above-mentioned composite thermal insulation pad 10, on the one hand, simultaneously provides the first thermal insulation layer 11 and the second thermal insulation layer 12, which can play a good thermal insulation role; on the other hand, the composite phase change layer 13 is arranged between the first thermal insulation layer 11 and the second thermal insulation layer 12, and the composite phase change layer 13 can absorb the heat transferred from the thermal insulation layers on both sides, thereby further improving the thermal insulation performance of the above-mentioned composite thermal insulation pad 10. It can be understood that in other examples, the above-mentioned outer thermal insulation pad may also include only the first thermal insulation layer 11, or only the second thermal insulation layer 12, and its material and thickness selection may be the same or similar to the first thermal insulation layer 11 or the second thermal insulation layer 12.

[0079] Please refer to Figure 2. In some embodiments, the composite thermal insulation pad 10 further includes an adhesive layer, and the outer thermal insulation layer is connected to the encapsulation layer 132 through the adhesive layer. Furthermore, the adhesive layer includes a first adhesive layer 151 and a second adhesive layer 152. The first thermal insulation layer 11 is connected to the encapsulation layer 132 through the first adhesive layer 151; the second thermal insulation layer 12 is connected to the encapsulation layer 132 through the second adhesive layer 152. In this way, the first thermal insulation layer 11, the composite phase change layer 13, and the second thermal insulation layer 12 of the composite thermal insulation pad 10 are connected and fixed in the thickness direction through the adhesive layer.

[0080] Furthermore, the material of the first adhesive layer 151 and the second adhesive layer 152 are each independently a silicone adhesive layer, and the thickness is independently 0.04mm to 0.06mm. The silicone adhesive layer is resistant to high temperatures and has high structural strength. The peeling force of the prepared composite thermal insulation pad is greater than 10N / cm. The peeling force can be measured by pulling the two sides of the composite thermal insulation pad with a tensile gauge, and applying a force perpendicular to the composite thermal insulation pad at 90° to the two sides of the composite thermal insulation pad outward. The tensile gauge will display the magnitude of the pulling force when the composite thermal insulation pad is peeled off, and the peeling force can be obtained based on the magnitude of the pulling force.

[0081] In some embodiments, the composite thermal insulation pad 10 further includes a release adhesive layer (not shown). The release adhesive layer includes a third adhesive layer and a release film. The third adhesive layer is disposed on the outer surface of the outer thermal insulation layer (i.e., the first thermal insulation layer 11 and / or the second thermal insulation layer 12), and the release film is disposed on the outer surface of the third adhesive layer. In this way, when the composite thermal insulation pad 10 needs to be fixed to a target position, such as a target battery cell, the release film on the surface of the release adhesive layer on the composite thermal insulation pad 10 is removed, and the composite thermal insulation pad 10 is simply and conveniently fixed to the target position by bonding with the third adhesive layer, thereby fixing the composite thermal insulation pad 10.

[0082] As an example, the aforementioned release adhesive layer is provided on the outer surfaces of the first insulation layer 11 and the second insulation layer 12 of the composite thermal insulation mat 10. During use, the composite thermal insulation mat 10 can be bonded and fixed to two objects, for example, two adjacent battery cells, using the release adhesive layers on both sides, so that the composite thermal insulation mat 10 is positioned between the two adjacent battery cells.

[0083] As shown in FIG. 2 , the first thermal insulation layer 11 and the second thermal insulation layer 12 are physically separated by the composite phase change layer 13 . In other words, the edges between the first thermal insulation layer 11 and the second thermal insulation layer 12 are not connected to each other.

[0084] In some embodiments, the length and width of the outer thermal insulation layer are respectively adapted to the length and width of the composite phase change layer 13. In other embodiments, at least one of the length and width of the outer thermal insulation layer is greater than the corresponding length or width of the composite phase change layer 13.

[0085] Referring to Figure 3 , in some embodiments, the edges of the first and second thermal insulation layers 11, 12 are connected to form an assembly cavity, within which the composite phase change layer 13 is located. This structural arrangement allows the composite phase change layer 13 to be positioned within the first and second thermal insulation layers 11, 12, reducing the risk of the composite phase change layer 13 falling off.

[0086] Furthermore, the edge of at least one side surface of at least one of the first thermal insulation layer 11 and the second thermal insulation layer 12 forms a convex portion, and the convex portion encloses at least part of the assembly cavity. As an example, the edge of at least one side surface of both the first thermal insulation layer 11 and the second thermal insulation layer 12 forms a convex portion, and the convex portions of the two are arranged relative to each other and enclose the assembly cavity. In the specific example shown in Figure 3, the edges of the four sides of the surface of one side of the first thermal insulation layer 11 and the second thermal insulation layer 12 form a convex portion, and the convex portions of the first thermal insulation layer 11 and the second thermal insulation layer 12 are arranged relative to each other and enclose the assembly cavity.

[0087] Typically, both sides of phase change material layer 131 are encapsulated with an encapsulation film, leaving an encapsulation margin on its sides, such as encapsulation margin 1321 shown in FIG. 7 . That is, encapsulation layer 132 has an encapsulation margin. When composite phase change layer 13 is disposed within first and second insulation layers 11, 12, the encapsulation margin is folded and positioned within the assembly cavity.

[0088] As an example, the encapsulation layer 132 has an encapsulation margin on all four sides.

[0089] Referring to Figure 4 , in some embodiments, the composite thermal insulation pad 10 further includes a third thermal insulation layer 16, and a composite phase change layer 13 is also provided between the second thermal insulation layer 12 and the third thermal insulation layer 16. Furthermore, the composite thermal insulation pad 10 may further include more thermal insulation layers, each of which may also have the aforementioned composite phase change layer 13 provided between adjacent thermal insulation layers.

[0090] Furthermore, the selection range of materials and thicknesses of the third thermal insulation layer 16 and other thermal insulation layers can be the same as that of the first thermal insulation layer 11 and the second thermal insulation layer 12; the specific materials and specific thicknesses can be the same or different.

[0091] Please refer to Figures 5 and 6. In some embodiments, the composite thermal insulation pad 10 also includes a first packaging frame 141 and a second packaging frame 142. The first packaging frame 141 is arranged on one side of the first thermal insulation layer 11, and the second packaging frame 142 is arranged on one side of the second thermal insulation layer 12. The first packaging frame 141 and the second packaging frame 142 cooperate to fix the first thermal insulation layer 11, the composite phase change layer 13 and the second thermal insulation layer 12.

[0092] Furthermore, the first packaging frame 141 and the second packaging frame 142 are each independently a rubber frame or a silicone frame. In other words, the first packaging frame 141 and the second packaging frame 142 are each independently made of rubber or silicone. Furthermore, the first packaging frame 141 and the second packaging frame 142 are both rectangular frame structures, such as a rectangular frame, and specifically can be a silicone rectangular frame.

[0093] In the example shown in Figures 6 and 7, the first packaging frame 141 has a first limiting groove (not shown), and the second packaging frame 142 has a second limiting groove (not shown). The first thermal insulation layer 11, the composite phase change layer 13 and the second thermal insulation layer 12 are limited in the limiting space formed by the first limiting groove and the second limiting groove. The first limiting groove and the second limiting groove can limit the first thermal insulation layer 11, the composite phase change layer 13 and the second thermal insulation layer 12 in the thickness direction and the radial direction of the composite thermal insulation pad 10, thereby improving the structural stability of the composite thermal insulation pad 10. Among them, the radial direction of the composite thermal insulation pad 10 refers to the direction from the center of the composite thermal insulation pad 10 to the edge of the composite thermal insulation pad 10. Further, at this time, the packaging margin 1321 of the packaging layer 132 can be located between the first packaging frame 141 and the second packaging frame 142. As shown in Figure 7, the packaging margin 1321 is pressed in the middle by the first packaging frame 141 and the second packaging frame 142.

[0094] It can be understood that when the above-mentioned first packaging frame 141 and second packaging frame 142 and the above-mentioned first thermal insulation layer 11 and second thermal insulation layer 12 that can form an assembly cavity are provided at the same time, the packaging margin portion 1321 of the packaging layer 132 can pass through between the convex portions of the first thermal insulation layer 11 and the second thermal insulation layer 12 and be located between the first packaging frame 141 and the second packaging frame 142, or the packaging margin portion 1321 of the packaging layer 132 can also be folded and located in the assembly cavity.

[0095] Referring to Figure 8 , in other embodiments, the outer surface of the first thermal insulation layer 11 is flush with the outer surface of the first packaging frame 141, and / or the outer surface of the second thermal insulation layer 12 is flush with the outer surface of the second packaging frame 142. This can minimize the thickness of the composite thermal insulation pad 10 and reduce the space it occupies while providing better thermal insulation performance.

[0096] As an example, based on the aforementioned first adhesive layer 151 and second adhesive layer 152, the aforementioned first packaging frame 141 and second packaging frame 142 can be further used to secure the first thermal insulation layer 11, the composite phase change layer 13, and the second thermal insulation layer 12 around their perimeters, thereby improving the structural stability of the composite thermal insulation pad 10. Furthermore, in this case, there is no need for the packaging frame to secure the thickness direction, so that the outer surface of the first thermal insulation layer 11 can be flush with the outer surface of the first packaging frame 141, and the outer surface of the second thermal insulation layer 12 can be flush with the outer surface of the second packaging frame 142.

[0097] It can be understood that in some embodiments, the first thermal insulation layer 11, the composite phase change layer 13, the second thermal insulation layer 12, and the third thermal insulation layer 16 can be connected by the above-mentioned adhesive layer, or by the above-mentioned packaging frame, or by both the above-mentioned adhesive layer and the packaging frame, or by neither, for example, the first thermal insulation layer 11 can be directly formed on the packaging layer 132 of the composite phase change layer 13.

[0098] Furthermore, the first thermal insulation layer 11 , the second thermal insulation layer 12 and the third thermal insulation layer 16 each independently include at least one of thermal insulation felt and thermal insulation coating.

[0099] Furthermore, when any of the aforementioned thermal insulation layers includes both a thermal insulation felt and a thermal insulation coating, the thermal insulation coating may be optionally disposed on a side closer to the composite phase change layer 13. Specifically, the thermal insulation coating is disposed on the surface of the encapsulation layer 132 of the composite phase change layer 13, and the thermal insulation felt is disposed on a side further away from the composite phase change layer 13. In other words, the thermal insulation coating is formed directly on the surface of the encapsulation layer 132 and is located between the encapsulation layer 132 and the thermal insulation felt.

[0100] For example, in the examples of Figures 1, 2 and 4, the first thermal insulation layer 11 and the second thermal insulation layer 12 are thermal insulation felt, and the third thermal insulation layer 16 is also thermal insulation felt. In other examples, the first thermal insulation layer 11 and the second thermal insulation layer 12 may also be thermal insulation coatings. In comparison, the thickness of the thermal insulation coating is thinner, and the overall thickness of the composite thermal insulation pad obtained is thinner, and the required space is relatively smaller. The thermal insulation layer of the composite thermal insulation pad 10 can optionally adopt a thermal insulation coating, or a composite of a thermal insulation coating and ceramic felt, which can take into account both a smaller occupied space and better thermal insulation performance.

[0101] For example, in the example shown in FIG3 , the first insulation layer 11 and the second insulation layer 12 are insulation felts, and the assembly cavity thereon can be integrally formed when the insulation felt is formed, or can be formed by grooving after the insulation felt is formed.

[0102] It is understood that the thermal insulation felt can be connected to the composite phase change layer 13 via the aforementioned adhesive layer or encapsulation frame. The thermal insulation coating can be formed directly on the encapsulation layer 132 in the composite phase change layer 13. As an example, the thermal insulation coating can be formed by coating the encapsulation layer 132 of the composite phase change layer 13 with a slurry and then drying it to form a coating.

[0103] Furthermore, the thermal insulation felt may be a ceramic thermal insulation felt; further, the thermal insulation coating may be a ceramic thermal insulation coating.

[0104] In some embodiments, the first thermal insulation layer 11, the second thermal insulation layer 12 and the third thermal insulation layer 16 each independently meet the following conditions: thermal conductivity at 25°C ≤ 0.020 W / m·K, thermal conductivity at 200°C ≤ 0.027 W / m·K, thermal conductivity at 300°C ≤ 0.035 W / m·K, and thermal conductivity at 500°C ≤ 0.080 W / m·K.

[0105] In some embodiments, the density of the first thermal insulation layer 11, the second thermal insulation layer 12, and the third thermal insulation layer 16 are independently 0.2 to 0.22 g / cm 3 .

[0106] In some embodiments, the outer insulation layer is a ceramic material layer.

[0107] In some embodiments, the thickness ratio of the composite phase change layer 13 to the outer heat insulation layer is 0.15-12:1, further 0.5-8:1, for example 0.15:1, 0.5:1, 1:1, 2:1, 4:1, 6:1, 8:1, 10:1, 12:1.

[0108] Furthermore, the thickness of the outer heat insulation layer is 0.5 mm to 8 mm. As an example, it can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm; it can be optionally 1 mm to 8 mm.

[0109] In this article, the following method can be used to test the thickness of composite insulation pads. The equipment used is a Mitutoyo 547-301 thickness gauge with an accuracy of ≤0.01mm. During testing, the composite insulation pad and the Mitutoyo 547-301 thickness gauge must be parallel to the ground. The test points are located at four corners and the center area, with the average of these five points being used as the test value.

[0110] In some embodiments, the first insulation layer 11 is a ceramic material layer. Further, the thickness of the first insulation layer 11 is 0.5 mm to 8 mm, and as an example, it can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm; optionally, it can be 1 mm to 8 mm.

[0111] In some embodiments, the second thermal insulation layer 12 is a ceramic material layer. Further, the thickness of the second thermal insulation layer 12 is 0.5 mm to 8 mm, and as an example, it can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm; optionally, it can be 1 mm to 8 mm.

[0112] The material of the "ceramic material layer" in this application includes, but is not limited to, at least one of ceramic oxides, ceramic nitrides, and ceramic carbides. The ceramic oxides include, but are not limited to, at least one of silicon oxide and aluminum oxide, the ceramic nitrides include, but are not limited to, silicon nitride, and the ceramic carbides include, but are not limited to, silicon carbide.

[0113] In some examples, the ceramic material layer may be a stack of one or more of a silicon oxide layer, an aluminum oxide layer, a silicon nitride layer, and a silicon carbide layer.

[0114] Furthermore, the ceramic insulation felt may be a silica aerogel ceramic felt. As an example, the silica aerogel ceramic felt may be prepared by inorganic fiber reinforcement technology to prepare aerogel materials, through impregnation sol, gel, solvent replacement and supercritical drying processes.

[0115] In some embodiments, the thickness of the phase change material layer 131 accounts for 70% to 96% of the total thickness of the composite phase change layer 13; as an example, the thickness may be 70%, 75%, 80%, 86%, 90%, 92%, 95%, 96%, and further, may be 86% to 96%.

[0116] In some embodiments, the thickness of the composite phase change layer 13 is 1 mm to 6 mm, and can be 1 mm to 4 mm. For example, it can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, or 6 mm. It can also be 1.5 mm to 3.5 mm.

[0117] In some embodiments, the thickness of the encapsulation layer 132 is 0.1 mm to 0.3 mm, for example, 0.1 mm, 0.15 mm, 0.2 mm, 0.3 mm, and optionally 0.1 mm to 0.15 mm, or 0.2 mm to 0.3 mm.

[0118] In some embodiments, the packaging layer 132 is an aluminum-plastic film or a polymer packaging film.

[0119] Furthermore, the packaging layer 132 includes a polypropylene layer, an aluminum layer, and a nylon layer stacked from the inside to the outside.

[0120] Furthermore, the polymer packaging film may be a PET film (polyethylene terephthalate film) or a PI film (polyimide film).

[0121] In some embodiments, a weak portion is provided in the area of ​​the packaging layer 132 that forms the packaging cavity. Because the weak portion is located in a weak area, when the phase-change material layer 131 absorbs a large amount of heat, the phase-change material in the phase-change material layer 131 undergoes a phase change, causing the packaging layer 132 to bulge. This allows the packaging layer 132 to rupture promptly at the weak portion in the event of thermal runaway, further reducing the damage to the battery as a whole.

[0122] It can be understood that the weak portion on the encapsulation layer 132 is an area on the encapsulation layer 132 where the strength is relatively weak.

[0123] In some embodiments, a weak portion is an area of ​​relatively thin thickness and / or relatively weak material strength. In other words, a weak portion can be an area of ​​relatively thin thickness but constant material strength, which can be formed by locally thinning the encapsulation layer 132. A weak portion can also be an area of ​​relatively constant thickness but relatively weak material strength, which can be formed by locally weakening the material strength of the encapsulation layer 132, for example, by using materials of different strengths. Alternatively, a weak portion can be an area of ​​relatively thin thickness and relatively weak material strength. It should be understood that the material strength here refers to the strength of the material itself.

[0124] Furthermore, the weak portion is a notch area formed on the encapsulation layer 132. It can be understood that the notch area is formed by thinning the surface of the encapsulation layer 132 in the form of engraving and pressing, and the thickness of the notch area is relatively thin.

[0125] Furthermore, the weak portion may be disposed on the outside or inside of the encapsulation layer 132 . The outside refers to the surface of the encapsulation layer 132 away from the phase change material layer 131 , and the inside refers to the surface of the encapsulation layer 132 close to the phase change material layer 131 .

[0126] Furthermore, the depth of the weak portion accounts for 15% to 50% of the thickness of the encapsulation layer 132, for example, 15%, 20%, 30%, 35%, 40%, 45%, or 50%. Controlling this thickness ratio allows the encapsulation layer to provide both good isolation when no package breakage is required and good timely package breakage in the event of thermal runaway.

[0127] Furthermore, the aluminum-plastic film includes an aluminum foil layer and plastic film layers arranged on both surfaces of the aluminum foil layer.

[0128] Furthermore, when the encapsulation layer 132 is an aluminum-plastic film, the weak portion extends from the surface of the aluminum-plastic film to 30% to 60% of the thickness of the aluminum foil layer, for example, 30%, 40%, 50%, or 60%. The weak portion is controlled to penetrate the aluminum foil layer without penetrating the aluminum foil layer, and is further controlled to penetrate 30% to 60% of the thickness of the aluminum foil layer. This ensures that the encapsulation layer provides both better isolation when rupture is not necessary and better, more timely rupture in the event of thermal runaway.

[0129] The plastic film layer in the aluminum-plastic film may include, but is not limited to, at least one of a polypropylene layer, a nylon layer, and a polyester layer. In some examples, encapsulation layer 132 includes a polypropylene layer, an aluminum foil layer, a nylon layer, and a polyester layer stacked from the inside out. Specifically, the thicknesses of the polypropylene layer, the aluminum foil layer, the nylon layer, and the polyester layer are 80 μm, 40 μm, 15 μm, and 6 μm, respectively. The weak portion may extend from one side of the polyester layer to half the thickness of the aluminum foil layer.

[0130] In some embodiments, the phase change material layer 131 includes a heat-insulating substrate in addition to the phase change material, and at least a portion of the phase change material is filled in the pores of the heat-insulating substrate. In other words, the pores of the heat-insulating substrate are filled with the phase change material.

[0131] The thermal insulation substrate may be a ceramic material substrate, such as ceramic fiber felt.

[0132] Furthermore, in some examples, at least a portion of the phase change material is directly filled into the pores of the thermal insulation substrate. In other examples, the phase change material can also be filled into the pores of the thermal insulation substrate in the form of phase change microcapsules. It is understood that the same thermal insulation substrate can also include two phase change material states: one in which the phase change material is directly filled into the pores of the thermal insulation substrate, and the other in which the phase change material is filled into the pores of the thermal insulation substrate in the form of phase change microcapsules.

[0133] It is understood that the phase change material layer 131 can be obtained by soaking a porous thermal insulation substrate such as ceramic fiber felt in a liquid phase change material, for example, by soaking it in a molten phase change material and then cooling it, or by soaking it in a phase change material solution and then drying or heat-insulating it. In addition to absorbing heat, the phase change material layer 131 can also provide thermal insulation. When the phase change material vaporizes and breaks through the encapsulation layer 132, that is, the composite thermal insulation pad 10 fails, the thermal insulation substrate in the phase change material layer 131 can continue to provide thermal insulation. In other words, the phase change material directly fills the pores of the thermal insulation substrate.

[0134] In other embodiments, at least a portion of the phase change material is filled in the pores of the thermal insulation substrate in the form of phase change microcapsules. In other words, the pores of the thermal insulation substrate of the phase change material layer 131 can be filled with phase change microcapsules. The phase change microcapsules include a core material and a wall material, wherein the wall material is wrapped around the outer surface of the core material, and the core material includes the phase change material. It is understood that in some examples, the pores of the thermal insulation substrate can also be directly filled with the phase change material and the aforementioned phase change microcapsules at the same time.

[0135] The above-mentioned phase change material layer 131 can be obtained by dispersing phase change microcapsules in a solvent to obtain a phase change microcapsule dispersion, then immersing a thermal insulation substrate in the phase change microcapsule dispersion to fill the phase change microcapsules in the pores of the thermal insulation substrate, and removing the solvent in the phase change microcapsule dispersion.

[0136] In this way, the phase change microcapsules in the phase change material layer 131 absorb heat. When the battery cell thermally runs away, the phase change material in the adjacent composite thermal insulation pad 10 vaporizes and breaks the packaging layer 132, that is, the composite thermal insulation pad 10 fails. At this time, the thermal insulation substrate in the phase change material layer 131 can continue to play a thermal insulation role.

[0137] Furthermore, the wall material includes a polymer matrix and ceramic particles filled in the polymer matrix. Furthermore, the mass ratio of the polymer matrix to the ceramic particles is 3:(7-11). As an example, the mass ratio of the polymer matrix to the ceramic particles can be 3:7, 3:8, 3:9, 3:10, or 3:11. By controlling the mass content of ceramic particles in the wall material to be relatively high, the pressure resistance and thermal insulation capabilities of the wall material can be improved.

[0138] Furthermore, the mass ratio of the polymer matrix to the core material is 1:(1.3-1.6). As an example, the mass ratio of the polymer matrix to the core material can be 1:1.3, 1:1.4, 1:1.5, or 1:1.6. This can further improve the pressure resistance of the phase change microcapsules.

[0139] Furthermore, the polymer matrix includes, but is not limited to, any one of phenolic resin, polyacrylonitrile resin, melamine formaldehyde resin, etc. The polymer matrix not only has good insulation properties, but also has good compatibility with phase change materials such as paraffin wax, and can form a stable interface with the phase change material, thereby improving the thermal stability of the phase change microcapsules.

[0140] Furthermore, the phase-change microcapsules have a Dv50 particle size of 5 μm to 8 μm. The Dv50 particle size, also known as the volume average particle size (Dv50), represents the particle size corresponding to 50% of the cumulative volume distribution of the particles. This can be measured using methods known in the art, for example, using a laser particle size analyzer (e.g., Malvern Master Size 3000).

[0141] Furthermore, the thermal conductivity of the wall material at 25° C. is ≥0.32 W / mK. Such a wall material has a good thermal conductivity and can better conduct heat to the phase change material inside it.

[0142] Furthermore, the melting point of the wall material is greater than 98° C. The high melting point of the wall material can maintain the structural stability of the microcapsule within the phase change temperature range of the phase change material.

[0143] The material selection of the above-mentioned thermal insulation substrate and ceramic particles in this application is the same as the selection range of the above-mentioned ceramic material layer. In some examples, the above-mentioned thermal insulation substrate is a ceramic fiber mat. The ceramic fiber mat has ceramic fiber as the core skeleton, which can not only well infiltrate the liquid phase change material so that the phase change material is filled in the pores of its core skeleton, but also has low thermal conductivity, good high temperature resistance (1280°C), resistance to instantaneous thermal shock, flame retardant properties and mechanical properties, no powdering, and is flexible and resilient, and is compatible with the battery pack manufacturing process.

[0144] In some examples, the ceramic particles include, but are not limited to, at least one of boron nitride particles, silicon nitride particles, silicon carbide particles, and silicon dioxide particles. Furthermore, the ceramic particles have a Dv50 of 60 nm to 90 nm. For example, the Dv50 of the ceramic particles can be any value among 60 nm, 65 nm, 70 nm, 75 nm, 80 nm, 83 nm, 85 nm, and 90 nm, or between any two values. Silicon dioxide particles of this specific particle size facilitate doping and uniform dispersion in the substrate.

[0145] Phase-change microcapsules can be obtained by in-situ polymerization, where the wall material is coated with the core material. In some examples, the preparation method of phase-change microcapsules includes the following steps: dispersing ceramic particles in water to form an aqueous phase; heating the phase-change material to a molten state to form an oil phase; mixing the aqueous and oil phases and stirring to form a Pickering emulsion; adding the raw materials required to prepare the polymer matrix of the wall material (such as a water-soluble polymer monomer or prepolymer aqueous solution) to the Pickering emulsion; and stirring and polymerizing at room temperature to form a water-insoluble condensation polymer (i.e., the polymer matrix) with a cross-linked three-dimensional network structure at the emulsion interface.

[0146] The polymer matrix of the above-mentioned material has better compatibility with phase change materials such as paraffin wax, and also facilitates the uniform dispersion of ceramic particles, thereby ensuring the stability of the phase change microcapsules.

[0147] Referring to FIG. 9 and FIG. 10 , another embodiment of the present application further provides a battery 30 , which includes any of the above-mentioned composite thermal insulation pads 10 .

[0148] Furthermore, the battery 30 further includes a plurality of battery cells 20, and the composite thermal insulation pad 10 is disposed between at least two adjacent battery cells 20. Optionally, a composite thermal insulation pad 10 is disposed between any two adjacent battery cells 20.

[0149] It is understandable that the above-mentioned composite thermal insulation pad 10 may also be provided between the battery cell 20 and the inner wall of the battery 30 shell.

[0150] In some embodiments, the above-mentioned battery 30 also includes a third adhesive layer, one side of which is arranged on the outer surface of the outer insulation layer (the first insulation layer 11 and / or the second insulation layer 12) of the composite insulation pad 10, and the other side is used to bond the composite insulation pad 10 to a designated position of the battery 30, for example, the other side is bonded to a surface (for example, a larger surface) of the battery cell 20.

[0151] The battery 30 is provided with the above-mentioned composite thermal insulation pad 10, and its working principle is as follows: In the first stage, after a battery cell 20 in the battery 30 undergoes thermal runaway, the heat is transferred to the adjacent (for example, adjacent) composite thermal insulation pad 10, and the phase change material layer 131 in the composite thermal insulation pad 10 absorbs heat, thereby preventing the battery from thermal runaway. In the second stage, the phase change material layer 131 absorbs heat until a phase change occurs, absorbing a large amount of heat. In the third stage, the encapsulation layer 132 and the phase change material layer 131 fail: the phase change material in the phase change material layer 131 is converted into gas and breaks the encapsulation layer 132, discharging the high-temperature gas. In the fourth stage, the first thermal insulation layer 11 and the second thermal insulation layer 12 and the optional thermal insulation substrate in the composite phase change layer 13 continue to play a role in thermal insulation.

[0152] Among them, the first stage and the second stage are the states before the composite thermal insulation pad 10 fails, and the third stage and the fourth stage are the states after the composite thermal insulation pad 10 fails.

[0153] It is understood that the shape of the battery cell 20 includes but is not limited to square and cylindrical. The composite thermal insulation pad 10 can be arranged in a manner consistent with the shape of the battery cell 20.

[0154] In some embodiments, the battery cell 20 is square, and the composite thermal insulation pad 10 is disposed on a side surface of the battery cell 20 with a larger area to increase its contact area and improve the thermal insulation performance.

[0155] Furthermore, the composite thermal insulation pad 10 is disposed between the large surfaces of two adjacent battery cells 20 .

[0156] In this application, unless otherwise specified, "battery cell 20" refers to a basic unit capable of converting chemical energy into electrical energy. Furthermore, it generally includes at least a positive electrode, a negative electrode, and an electrolyte. During the battery's charge and discharge process, active ions are embedded in and released from the positive and negative electrodes. The electrolyte conducts active ions between the positive and negative electrodes.

[0157] It is understood that after multiple battery cells 20 are interconnected and arranged in a certain order, they can be directly housed in a housing to form a battery. Alternatively, multiple battery cells 20 can be first assembled into a battery module, and then the multiple battery modules are interconnected to form a whole, and finally the entire battery module is housed in a housing to form a battery.

[0158] Generally, the battery cell 20 includes a housing 21 , a cover plate 23 and an electrode assembly 22 . The electrode assembly 22 is accommodated in the housing 21 , and the cover plate 23 is sealed at the opening.

[0159] For example, Figure 11 shows a square-shaped battery cell 20 as an example. Battery cell 20 includes a housing 21, a cover 23, and an electrode assembly 22. Electrode assembly 22 is housed within housing 21, with cover 23 sealingly positioned over the opening. Electrode assembly 22 includes a positive electrode sheet, a negative electrode sheet, and a separator. These sheets can be formed through a winding process or a lamination process.

[0160] Furthermore, the electrode assembly 22 also includes an electrolyte, such as an electrolyte solution. The electrolyte solution is immersed in the electrode assembly 22. The number of electrode assemblies 22 included in the battery cell 20 can be one or more, and those skilled in the art can select the number based on specific practical needs.

[0161] Furthermore, one or both ends of the housing 21 are provided with an opening.

[0162] Furthermore, the housing 21 is a rectangular parallelepiped housing, and the opening of the housing 21 is oriented along the height of the housing 21. Furthermore, the housing 21 has openings at both ends, and the two openings are arranged opposite each other along the height of the housing 21. Further, as a non-limiting example, the height of the housing 21 is 80 mm to 210 mm; further, as a non-limiting example, the length of the housing 21 is 90 mm to 240 mm; further, as a non-limiting example, the width of the housing 21 is 20 mm to 80 mm.

[0163] Furthermore, the battery cell 20 and the shell 21 are rectangular shells, and the composite insulation pad 10 is arranged on the side of the battery cell 20 with a larger area. The side of the larger area is perpendicular to the above-mentioned width direction, that is, the side formed by the two sides of the above-mentioned length direction and height direction.

[0164] As a further non-limiting example, the wall thickness of the housing is 0.5 mm to 0.8 mm.

[0165] Furthermore, the housing is an aluminum alloy housing; for example, a third-series aluminum alloy housing or a fifth-series aluminum alloy housing.

[0166] Furthermore, the aluminum alloy of the three-series aluminum alloy shell includes the following components in percentage by mass: aluminum ≥ 99.6%, copper ≤ 0.05%, iron ≤ 0.35%, magnesium ≤ 0.03%, manganese ≤ 0.03%, silicon ≤ 0.25%, titanium ≤ 0.03%, vanadium ≤ 0.05%, zinc ≤ 0.05%, and other single elements ≤ 0.03%.

[0167] Furthermore, the aluminum alloy of the fifth series aluminum alloy shell includes the following components in percentage by mass: aluminum ≥ 96.7%, 0.05% ≤ copper ≤ 0.2%, iron ≤ 0.7%, manganese ≤ 1.5%, silicon ≤ 0.6%, zinc ≤ 0.1%, other single element components ≤ 0.05%, and the total components of other elements ≤ 0.15%.

[0168] Another embodiment of the present application further provides an electrical device, comprising the battery provided herein. The battery can be used as a power source for the electrical device or as an energy storage unit for the electrical device. The electrical device may include, but is not limited to, mobile devices, electric vehicles, electric trains, ships, satellites, energy storage systems, and the like. Examples of mobile devices include, but are not limited to, mobile phones and laptop computers; examples of electric vehicles include, but are not limited to, pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, and electric trucks.

[0169] As an electrical device, a secondary battery, a battery module or a battery pack can be selected according to its usage requirements.

[0170] Figure 12 shows an example of an electric device 40. The electric device 40 is a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle. To meet the electric device's requirements for high power and high energy density of secondary batteries, a battery pack or battery module can be used.

[0171] Another example device may be a mobile phone, a tablet computer, a notebook computer, etc. Such a device is generally required to be lightweight and thin, and may use a secondary battery as a power source.

[0172] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0173] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A composite thermal insulation pad, comprising: a composite phase change layer, comprising a phase change material layer and an encapsulation layer, wherein the encapsulation layer is disposed on the outer periphery of the phase change material layer; and The outer heat insulating layer is provided on at least one side of the outer periphery of the packaging layer.

2. The composite thermal insulation pad according to claim 1, wherein: The outer heat insulation layer is provided on at least one of two sides of the composite phase change layer in a thickness direction.

3. The composite thermal insulation pad according to claim 2, wherein: The outer heat insulation layer includes a first heat insulation layer and a second heat insulation layer; The first thermal insulation layer and the second thermal insulation layer are respectively arranged on both sides of the composite phase change layer in a thickness direction, so that the composite phase change layer is sandwiched between the first thermal insulation layer and the second thermal insulation layer.

4. The composite thermal insulation pad according to claim 3, wherein: The edges of the first heat-insulating layer and the second heat-insulating layer are connected to each other to form an assembly cavity, and the composite phase change layer is located in the assembly cavity.

5. The composite thermal insulation pad according to claim 4, wherein: An edge of at least one side surface of at least one of the first heat-insulating layer and the second heat-insulating layer forms a convex portion, and the convex portion encloses and forms at least a portion of the assembly cavity.

6. The composite thermal insulation pad according to claim 4, wherein: The packaging layer has a packaging margin portion, and the packaging margin portion is folded and located in the assembly cavity.

7. The composite thermal insulation pad according to any one of claims 3 to 5, wherein: The composite thermal insulation pad also includes a first packaging frame and a second packaging frame. The first packaging frame is arranged on one side of the first thermal insulation layer, and the second packaging frame is arranged on one side of the second thermal insulation layer. The first packaging frame and the second packaging frame cooperate to fix the first thermal insulation layer, the composite phase change layer and the second thermal insulation layer.

8. The composite thermal insulation pad according to claim 7, wherein: The packaging layer has a packaging margin portion, and the packaging margin portion is located between the first packaging frame and the second packaging frame.

9. The composite thermal insulation pad according to claim 7, wherein: The first packaging frame has a first limiting groove, the second packaging frame has a second limiting groove, and the first thermal insulation layer, the composite phase change layer and the second thermal insulation layer are limited in a limiting space formed by the first limiting groove and the second limiting groove.

10. The composite thermal insulation pad according to claim 7, wherein: At least one of the following conditions is met: (1) The outer surface of the first thermal insulation layer is flush with the outer surface of the first packaging frame; (2) The outer surface of the second heat insulation layer is flush with the outer surface of the second packaging frame.

11. The composite thermal insulation pad according to any one of claims 1 to 10, wherein: At least one of the following conditions is met: The length and width dimensions of the outer heat insulation layer are respectively adapted to the length and width dimensions of the composite phase change layer; or, at least one of the length and width dimensions of the outer heat insulation layer is greater than the corresponding length or width dimension of the composite phase change layer.

12. The composite thermal insulation pad according to any one of claims 1 to 10, wherein: The composite thermal insulation pad meets at least one of the following conditions: (1) The composite thermal insulation pad further includes an adhesive layer, and the outer thermal insulation layer and the encapsulation layer are connected via the adhesive layer; (2) The composite thermal insulation pad also includes a release adhesive layer, which includes an adhesive layer and a release film. The adhesive layer is arranged on the outer surface of the outer thermal insulation layer, and the release film is arranged on the outer surface of the adhesive layer.

13. The composite thermal insulation pad according to any one of claims 1 to 10, wherein: The composite thermal insulation pad meets at least one of the following conditions: (1) The outer thermal insulation layer is a ceramic material layer; (2) The encapsulation layer is an aluminum-plastic film or a polymer encapsulation film; (3) The thickness of the encapsulation layer is 0.1 mm to 0.3 mm; (4) The thickness of the composite phase change layer is 1 mm to 6 mm; (5) The thickness of the outer insulation layer is 0.5 mm to 8 mm; (6) The thickness of the phase change material layer accounts for 70% to 96% of the total thickness of the composite phase change layer; (7) The thickness ratio of the composite phase change layer to the outer heat insulation layer is 0.15 to 12:

1.

14. The composite thermal insulation pad according to any one of claims 3 to 10, wherein: The composite thermal insulation pad also includes a third thermal insulation layer, and the composite phase change layer is also provided between the second thermal insulation layer and the third thermal insulation layer.

15. A battery comprising the composite thermal insulation pad according to any one of claims 1 to 14.

16. The battery according to claim 15, wherein It also includes a plurality of battery cells, and the composite thermal insulation pad is arranged between at least two adjacent battery cells.

17. The battery according to claim 16, wherein The composite thermal insulation pad is arranged between the large surfaces of two adjacent battery cells.

18. An electrical device comprising the battery according to any one of claims 15 to 17.

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