Battery device, thermal insulation pad and electric device

Abstract

The application discloses a battery device, a heat insulation pad and a power utilization device, and belongs to the technical field of batteries. The battery device comprises a battery monomer assembly and a heat insulation pad. The battery monomer assembly comprises a plurality of battery monomers arranged along a first direction. The heat insulation pad is arranged between two adjacent battery monomers. The heat insulation pad comprises a heat insulation core material and a frame. The frame is arranged around the heat insulation core material. The frame comprises a first sub-frame and a second sub-frame. The compression strength of the first sub-frame is smaller than that of the second sub-frame. The battery monomer has high reliability.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery device, a heat insulation pad, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Improving the reliability of battery devices is a pressing issue in battery technology. Summary of the Invention

[0004] In view of the above problems, this application provides a battery device, a heat insulation pad, and an electrical device that can improve the reliability of the battery device.

[0005] In a first aspect, this application provides a battery device, which includes a battery cell assembly and a heat insulation pad. The battery cell assembly includes a plurality of battery cells arranged along a first direction. The heat insulation pad is disposed between two adjacent battery cells. The heat insulation pad includes a heat insulation core material and a frame, the frame surrounding the heat insulation core material. The frame includes a first sub-frame and a second sub-frame, the compressive strength of the first sub-frame being less than the compressive strength of the second sub-frame.

[0006] In the technical solution of this application embodiment, the heat insulation core material can, to a certain extent, block heat transfer between two adjacent battery cells, reducing the risk of heat concentration in the battery cell assembly leading to a decrease in battery cell reliability. For example, when a battery cell in the battery cell assembly experiences thermal runaway, the heat insulation core material can reduce the risk of the thermally runaway battery cell triggering thermal runaway in other battery cells, thus reducing the risk of thermal runaway propagation in the battery device. Since the frame surrounds the heat insulation core material, the two can serve as assembly references for each other, simplifying the assembly difficulty of the heat insulation pad. Because the first and second sub-frames of the frame are made of materials with different compressive strengths, on the one hand, the first and second sub-frames with different compressive strengths can be selectively configured in areas with different deformation ranges of the battery cells. This arrangement can reduce the excessive consumption of the buffering capacity of the frame by the force generated by the deformation of the battery cells while providing excellent overall buffering performance, thereby reducing the risk of frame damage and reduced lifespan. In this way, the heat insulation pad can continuously maintain good buffering performance throughout the battery device's service life, thereby improving the reliability of the battery device. On the other hand, it can also take into account the specific design requirements of the battery cells to ensure that the battery cells have good buffering performance while having low manufacturing costs, thus balancing the performance and cost of the battery cells.

[0007] In one or more embodiments of the first aspect, two first sub-borders are provided, and two second sub-borders are provided. The two first sub-borders are spaced apart along a third direction, and the two second sub-borders are spaced apart along a second direction. The second direction, the third direction, and the first direction are perpendicular to each other.

[0008] In the above scheme, since the two first sub-frames are spaced apart along a third direction and the two second sub-frames are spaced apart along a second direction, the deformation force of the battery cell can be distributed to multiple areas, reducing the risk of failure due to excessive deformation caused by excessive stress at a single point on the frame. Simultaneously, this arrangement buffers most of the area between two adjacent battery cells while also reserving a larger space for the heat insulation core material, fully utilizing the limited space between the two battery cells to improve the reliability of the battery device. Furthermore, the first and second sub-frames can serve as assembly references for each other, and by using the first direction as a reference, the assembly difficulty of the heat insulation pad can be further reduced.

[0009] In one or more embodiments of the first aspect, the first sub-border extends along a second direction, and the second sub-border extends along a third direction.

[0010] In the above scheme, the extension direction of the first sub-frame is perpendicular to the extension direction of the second sub-frame, which allows the frame to have a larger buffer area while reducing space waste. In addition, it can also disperse impact force in multiple directions, reducing the risk of stress concentration.

[0011] In one or more embodiments of the first aspect, the two ends of the first sub-frame along the second direction respectively contact the two second sub-frames.

[0012] In the above scheme, the first and second sub-frames can support each other, forming a more stable frame structure. This reduces the risk of the frame being squeezed between adjacent battery cells, causing the heat insulation pad to fail, when the battery cell deforms.

[0013] In one or more embodiments of the first aspect, the dimension of the battery cell along the second direction is greater than the dimension of the battery cell along the third direction.

[0014] In the above scheme, since the size of the battery cell along the second direction is larger than that along the third direction, the bending or arching of the battery cell along the second direction is larger, while the bending or arching of the battery cell along the third direction is smaller. By setting the extension direction of the first sub-frame with lower compressive strength to be consistent with the second direction, and setting the extension direction of the second sub-frame with higher compressive strength to be consistent with the third direction, the first and second sub-frames can achieve optimal compression performance while having a longer service life.

[0015] In one or more embodiments of the first aspect, the battery cell includes an electrode assembly, the electrode assembly having a wound structure, and the winding axis of the electrode assembly being parallel to a third direction.

[0016] In the above scheme, since the electrode assembly is a wound structure, the electrode assembly bends or arches more in the second direction and less in the third direction. By setting the extension direction of the first sub-frame with lower compressive strength to be consistent with the second direction and the extension direction of the second sub-frame with higher compressive strength to be consistent with the third direction, the first and second sub-frames can achieve optimal compression performance while having a longer service life.

[0017] In one or more embodiments of the first aspect, the battery cell includes a casing, a first insulating member, and a second insulating member. The casing includes a first wall, a second wall, and a sidewall. The first wall and the second wall are disposed opposite each other along a third direction, and the sidewall surrounds the first wall and the second wall. The first insulating member covers a portion of the outer surface of the first wall and has a first surface away from the second wall along a third direction. The second insulating member includes a body that covers the outer surface of the sidewall. A heat insulation pad is disposed on the surface of the body perpendicular to the first direction, and the body has a second surface away from the first wall along a third direction. Wherein, along the third direction, the minimum distance between the frame and the first surface is L1, satisfying: 0 < L1 ≤ 5 mm, and / or, along the third direction, the minimum distance between the frame and the second surface is L2, satisfying: 0 < L2 ≤ 5 mm.

[0018] In the above scheme, when L1>0, a certain assembly space can be reserved between the frame and the first surface to reduce the assembly difficulty of the frame; when L1≤5mm, it is beneficial to make the frame have a larger area, thereby increasing the area of ​​the heat insulation pad buffer area, reducing the risk of damage to adjacent battery cells due to deformation of the battery cells, and making the battery device have higher reliability; therefore, when 0<L1≤5mm, while reducing the assembly difficulty of the frame, the battery device can also have higher reliability.

[0019] When L2 > 0, a certain assembly space can be reserved between the frame and the second surface, reducing the assembly difficulty of the frame; when L2 ≤ 5mm, it is beneficial to have a larger area of ​​the frame, thereby increasing the area of ​​the heat insulation pad buffer area, reducing the risk of damage to adjacent battery cells due to deformation of the battery cells, and making the battery device more reliable; therefore, when 0 < L1 ≤ 5mm, while reducing the assembly difficulty of the frame, the battery device can also have higher reliability.

[0020] In one or more embodiments of the first aspect, the battery cell includes a casing and a second insulating member. The casing includes a first wall, a second wall, and sidewalls. The first and second walls are disposed opposite each other along a third direction. The sidewalls surround the first and second walls and include two third walls disposed opposite each other along a second direction, two fourth walls disposed opposite each other along a first direction, and a plurality of transition walls. The third and fourth walls are connected by transition walls. The second insulating member includes a main body, which includes a first portion, a second portion, and a transition portion. The first portion covers the third wall, the second portion covers the fourth wall, and the transition portion covers the transition wall. A heat insulation pad is disposed on the surface of the second portion perpendicular to the first direction. Along the second direction, the second portion has a first edge and a second edge disposed opposite each other. Wherein, along the second direction, the minimum distance between the frame and the first edge is L3, satisfying: 0 < L3 ≤ 5 mm; and / or, along the second direction, the minimum distance between the frame and the second edge is L4, satisfying: 0 < L4 ≤ 5 mm.

[0021] In the above scheme, when L3 > 0, a certain assembly space can be reserved between the frame and the first edge to reduce the assembly difficulty of the frame; when L3 ≤ 5mm, it is beneficial to make the frame have a larger area, thereby increasing the area of ​​the heat insulation pad buffer area, reducing the risk of damage to adjacent battery cells due to deformation of the battery cells, and making the battery device have higher reliability; therefore, when 0 < L3 ≤ 5mm, while reducing the assembly difficulty of the frame, the battery device can also have higher reliability.

[0022] When L4 > 0, a certain assembly space can be reserved between the frame and the second edge, reducing the assembly difficulty of the frame; when L4 ≤ 5mm, it is beneficial to have a larger area of ​​the frame, thereby increasing the area of ​​the heat insulation pad buffer area, reducing the risk of damage to adjacent battery cells due to deformation of the battery cells, and making the battery device more reliable; therefore, when 0 < L4 ≤ 5mm, while reducing the assembly difficulty of the frame, the battery device can also have higher reliability.

[0023] In one or more embodiments of the first aspect, the battery cell includes an electrode assembly, and the electrode assembly includes a tab. In the same projection plane perpendicular to the first direction, the orthographic projection of the frame and the orthographic projection of the tab do not overlap.

[0024] In the above solution, since the orthographic projection of the frame and the orthographic projection of the tab do not overlap in the same projection plane perpendicular to the first direction, the risk of the reaction force of the frame acting on the tab causing tab connection failure is low, and the reliability of the battery cell is high.

[0025] In one or more embodiments of the first aspect, the surface of the battery cell perpendicular to the first direction is the surface with the largest area of ​​the battery cell.

[0026] In the above scheme, since the surface with the largest area of ​​the battery cell has a larger deformation range, and the temperature of the battery cell rises faster when heat is transferred to the surface with the largest area of ​​the battery cell, placing the heat insulation pad between the surfaces with the largest areas of two adjacent battery cells can significantly improve the reliability of the electrical device.

[0027] In one or more embodiments of the first aspect, the width of the first sub-border is W1, satisfying: 6mm≤W1≤8mm.

[0028] In the above scheme, when W1≥6mm, the first sub-frame can have a larger buffer area, so that the heat insulation pad has better buffer performance; when W1≤8mm, it is beneficial to make more space to arrange the heat insulation core material, so that the heat insulation pad has better heat insulation performance; therefore, when 6mm≤W1≤8mm, the heat insulation pad can take into account both good buffer performance and heat insulation performance.

[0029] In one or more embodiments of the first aspect, the width of the second sub-border is W2, satisfying: 8mm≤W2≤10mm.

[0030] In the above scheme, when W2≥8mm, the second sub-frame can have a larger buffer area, giving the heat insulation pad better buffer performance; when W2≤10mm, it is beneficial to make more space for the heat insulation core material, thus giving the heat insulation pad better heat insulation performance; therefore, when 8mm≤W1≤10mm, the heat insulation pad can take into account both good buffer performance and heat insulation performance.

[0031] In one or more embodiments of the first aspect, the material of the first sub-frame includes one or more of silicone foam and microporous foamed polypropylene.

[0032] In one or more embodiments of the first aspect, the material of the second sub-frame includes one or more of melamine and hard rubber.

[0033] In one or more embodiments of the first aspect, the material of the thermal insulation core includes one or more of mica and aerogel.

[0034] In one or more embodiments of the first aspect, two adjacent battery cells include a first battery cell and a second battery cell. The thermal insulation pad also includes a first adhesive layer, through which the frame and the thermal insulation core are bonded to the first battery cell.

[0035] In the above scheme, the setting of the first adhesive layer can improve the connection stability between the frame and the heat insulation core material and the first battery cell.

[0036] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the first direction, the orthographic projection of the first adhesive layer at least partially overlaps with the orthographic projection of the thermal insulation core material, the orthographic projection of the first adhesive layer at least partially overlaps with the orthographic projection of the first sub-frame, and the orthographic projection of the first adhesive layer at least partially overlaps with the orthographic projection of the second sub-frame.

[0037] In the above solution, since the first adhesive layer simultaneously bonds the heat insulation core material, the first sub-frame, and the second sub-frame, the assembly of the heat insulation core material, the first sub-frame, and the second sub-frame with the first battery cell can be completed in one bonding operation, thus improving the assembly efficiency of the heat insulation pad.

[0038] In one or more embodiments of the first aspect, the heat insulation pad further includes a second adhesive layer, through which the frame and the heat insulation core are bonded to the second battery cell.

[0039] In the above scheme, the setting of the second adhesive layer can further improve the connection stability between the frame and the heat insulation core material and the first battery cell.

[0040] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the first direction, the orthographic projection of the second adhesive layer at least partially overlaps with the orthographic projection of the thermal insulation core material, the orthographic projection of the second adhesive layer at least partially overlaps with the orthographic projection of the first sub-frame, and the orthographic projection of the second adhesive layer at least partially overlaps with the orthographic projection of the second sub-frame.

[0041] The above solution can further improve the connection stability between the frame and the heat insulation core material and the first battery cell, while also enabling the heat insulation pad to have high assembly efficiency.

[0042] In one or more embodiments of the first aspect, the electrical device further includes a housing, and a battery cell assembly is disposed within the housing. The housing includes a first limiting member and a second limiting member, which are spaced apart along a first direction, and the battery cell assembly is disposed between the first limiting member and the second limiting member.

[0043] In the above scheme, since the compressive strength of the first sub-frame is less than that of the second sub-frame, the battery cell assembly can be more easily installed between the first limiting member and the second limiting member along the extension direction perpendicular to the first sub-frame and perpendicular to the first direction, thereby reducing the assembly difficulty of the battery cell assembly.

[0044] Secondly, this application provides a heat insulation pad, which includes an intermediate layer, a first adhesive layer, and a first release paper. The intermediate layer includes a heat insulation core material and a frame. The frame surrounds the heat insulation core material and includes a first sub-frame and a second sub-frame. The compressive strength of the first sub-frame is less than that of the second sub-frame. The first adhesive layer is disposed on one side of the intermediate layer in the thickness direction. The first release paper is disposed on the side of the first adhesive layer opposite to the intermediate layer.

[0045] In the above solution, the first sub-frame, the second sub-frame, the thermal insulation core material, and the first release paper can be supplied as a single unit. On the one hand, this reduces the risk of the thermal insulation pad failing due to displacement caused by the separation of the first sub-frame, the second sub-frame, and the thermal insulation core material, thus giving the thermal insulation pad higher structural stability. On the other hand, after separating the first release paper and the first adhesive layer, the bonding operation of the first sub-frame, the second sub-frame, and the thermal insulation core material can be completed in one step, improving the assembly efficiency of the thermal insulation pad.

[0046] In one or more embodiments of the first aspect, the heat insulation pad further includes a second adhesive layer and a second release paper, the second adhesive layer being disposed on the opposite side of the thickness direction of the intermediate layer. The second release paper is disposed on the side of the second adhesive layer opposite to the intermediate layer.

[0047] In the above scheme, while enabling the heat insulation pad to have high assembly efficiency, the setting of the second adhesive layer and the second release paper can further improve the structural stability of the heat insulation pad before and after assembly, as well as the connection stability of the heat insulation pad after assembly.

[0048] Thirdly, this application provides an electrical device that includes the battery device in one or more of the above embodiments, the battery device being used to provide electrical energy.

[0049] In the above solutions, since the battery device in one or more of the above embodiments has high reliability, the power supply device including the battery device in one or more of the above embodiments also has high reliability.

[0050] In the above solutions, since the battery cells or battery devices in one or more of the above embodiments have high reliability, the battery devices including the battery cells or battery devices in one or more of the above embodiments also have high reliability.

[0051] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0052] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0053] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0054] Figure 2 Exploded views of battery devices according to some embodiments of this application;

[0055] Figure 3 Here are exploded views of individual battery cells from some embodiments of this application;

[0056] Figure 4 This is a schematic diagram of a portion of the structure of a battery device according to some embodiments of this application;

[0057] Figure 5 Exploded views of the heat insulation pads of some embodiments of this application;

[0058] Figure 6 This is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0059] Figure 7 This is a cross-sectional view of a portion of the structure of a battery device according to other embodiments of this application;

[0060] Figure 8 This is a schematic diagram of a portion of the structure of a battery device according to some embodiments of this application, showing a first insulating member and a second insulating member;

[0061] Figure 9 This is a schematic diagram of the structure of a battery cell according to some embodiments of this application;

[0062] Figure 10 This is a schematic diagram of a portion of the structure of a battery device according to other embodiments of this application.

[0063] The reference numerals in the detailed embodiments are as follows:

[0064] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 11 - Housing; 111 - First Housing; 112 - Second Housing; 113 - First Limiting Member; 114 - Second Limiting Member; 12 - Battery Cell; 121 - Outer Shell; 1211 - End Cap; 1212 - Housing; 1213 - First Wall; 1214 - Second Wall; 1215 - Side Wall; 12151 - Third Wall; 12152 - Fourth Wall; 12153 - Transition Wall; 126 - First Insulator; 1261 - First Surface; 127 - Second Insulator; 1271 - Main Body; 12711 - Second Surface; 12712 - First Part; 12713 - Second part; 127131 - First edge; 127132 - Second edge; 1272 - First flanged part; 1273 - Second flanged part; 12714 - Transition part; 122 - Electrode assembly; 1221 - Electrode tab; 123 - Electrode terminal; 124 - Adapter; 125 - Pressure relief mechanism; 13 - Heat insulation pad; 131 - Heat insulation core material; 132 - Frame; 1321 - First sub-frame; 1322 - Second sub-frame; 133 - First adhesive layer; 134 - Second adhesive layer; 135 - First release paper; 136 - Second release paper; 130 - Intermediate layer; X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0065] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0067] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0068] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0069] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0070] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0071] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0072] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0073] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0074] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0075] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, at least one of lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co0.25Mn0.25O2 (also abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.85Co0.15Al0.05O2) and their modified compounds.

[0077] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0078] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0079] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0080] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0081] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0082] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0083] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0084] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0085] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0086] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0087] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0088] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0089] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0090] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0091] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0092] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0093] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0094] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0095] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0096] In some implementations, the electrode assembly is a stacked structure.

[0097] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0098] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0099] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0100] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0101] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0102] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0103] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0104] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0105] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0106] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0107] In related technologies, a battery cell generally includes a casing and an electrode assembly. The casing may include a housing and an end cap. The housing has an opening. After the electrode assembly is installed inside the housing, the opening of the housing can be closed by the end cap to form a sealed space inside the housing to accommodate the electrode assembly.

[0108] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0109] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0110] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0111] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0112] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0113] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0114] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0115] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0116] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate and other performance parameters. In addition, the reliability of the battery device also needs to be considered.

[0117] In typical battery cell assemblies, a heat insulation pad is usually placed between two adjacent battery cells. However, during the use of the battery device, damage to the battery cells due to friction and compression between adjacent cells is common. This problem may be caused by a mismatch between the compressive strength of the heat insulation pad and the operating conditions of the battery cell, or by inconsistent deformation on the same side of the battery cell. Once the buffering performance of the heat insulation pad fails, the reliability of the battery cell will drop sharply, and the overall performance of the electrical device will also decline drastically.

[0118] In view of this, this application provides a battery device, which includes a battery cell assembly and a heat insulation pad. The battery cell assembly includes a plurality of battery cells arranged along a first direction. The heat insulation pad is disposed between two adjacent battery cells. The heat insulation pad includes a heat insulation core material and a frame. The frame surrounds the heat insulation core material and includes a first sub-frame and a second sub-frame. The compressive strength of the first sub-frame is less than that of the second sub-frame. The heat insulation core material can, to a certain extent, block heat transfer between two adjacent battery cells, reducing the risk of heat concentration in the battery cell assembly leading to a decrease in battery cell reliability. For example, if a battery cell in the battery cell assembly experiences thermal runaway, the heat insulation core material can reduce the risk of the thermally runaway battery cell triggering thermal runaway in other battery cells, thus reducing the risk of thermal runaway propagation in the battery device. Since the frame surrounds the heat insulation core material, the two can serve as assembly references for each other, simplifying the assembly difficulty of the heat insulation pad. Because the first and second sub-frames of the battery pack are made of materials with different compressive strengths, on the one hand, the first and second sub-frames with different compressive strengths can be strategically configured in areas where the battery cells deform at different rates. This arrangement allows the overall frame to have excellent cushioning performance while reducing excessive consumption of the frame's cushioning capacity due to the forces generated by the deformation of the battery cells, thereby reducing the risk of frame damage and reduced lifespan. In this way, the heat insulation pad can maintain good cushioning performance throughout the battery pack's lifespan, thus improving the reliability of the battery pack. On the other hand, it also allows for comprehensive consideration of the specific design requirements of the battery cells, enabling the battery cells to have good cushioning performance while maintaining low manufacturing costs, thus balancing the performance and cost of the battery cells.

[0119] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0120] Electrical devices include, but are not limited to: electric vehicles, electric cars, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0121] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0122] For example, Figure 1 This is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 may have a motor 300, a controller 200, and a battery device 100 installed inside. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle.

[0123] To meet different power demands, the battery device 100 may include multiple battery cells 12, which can be connected in series, parallel, or a combination thereof. The battery device 100 may also be referred to as a battery pack. Optionally, the multiple battery cells 12 can first be connected in series, parallel, or a combination thereof to form a battery cell assembly, and then the battery cell assemblies can be connected in series, parallel, or a combination thereof to form the battery device 100. In other words, the multiple battery cells 12 can directly form the battery device 100, or they can first be assembled into battery cell assemblies, and then the battery cell assemblies can be assembled into the battery device 100.

[0124] For example, please refer to Figure 2 , Figure 2 The image shown is an exploded view of a battery device 100 according to some embodiments of this application. The battery device 100 may include a plurality of battery cells 12. The battery device 100 may also include a housing 11, which has a hollow interior structure, and the plurality of battery cells 12 are housed within the housing 11. Figure 2As shown, these are referred to as the first housing 111 and the second housing 112, respectively, and are fastened together. The shapes of the first housing 111 and the second housing 112 can be determined according to the combined shape of multiple battery cells 12. Both the first housing 111 and the second housing 112 may have an open surface. For example, both the first housing 111 and the second housing 112 can be hollow cuboids with only one open surface each. The open surfaces of the first housing 111 and the second housing 112 are arranged opposite to each other, and the first housing 111 and the second housing 112 are fastened together to form a housing 11 with a closed cavity. Multiple battery cells 12 are connected in parallel, series, or mixed configurations and placed inside the housing 11 formed by the fastening of the first housing 111 and the second housing 112.

[0125] Optionally, the battery device 100 may also include other structures, which will not be described in detail here. For example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple battery cells 12, such as in parallel, series, or mixed connection. Specifically, the busbar component can realize electrical connection between battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Further, the busbar component can be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the housing 11 via a conductive mechanism.

[0126] The number of battery cells 12 can be set to any value depending on different power requirements. Multiple battery cells 12 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 100 may include a large number of battery cells 12, for ease of installation, the battery cells 12 can be grouped, with each group of battery cells 12 forming a battery cell assembly. The number of battery cells 12 included in a battery cell assembly is unlimited and can be set according to requirements. The battery device 100 may include multiple battery cell assemblies, which can be connected in series, parallel, or mixed connection.

[0127] Please refer to Figure 3 As shown, Figure 3The image shows an exploded view of a battery cell 12 according to some embodiments of this application. The battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 may include a shell 1212, and multiple walls of the shell 1212 form a cavity for accommodating the electrode assemblies 122. The shape of the shell 1212 depends on the combined shape of the one or more electrode assemblies 122. For example, the shell 1212 may be a hollow cuboid, cube, or regular polyhedron, and one face of the shell 1212 may have an opening so that one or more electrode assemblies 122 can be placed inside the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolyte solution.

[0128] The battery cell 12 may also include two electrode terminals 123, which can be disposed on an end cap 1211. The end cap 1211 is typically flat, and the two electrode terminals 123 are fixed to the flat surface of the end cap 1211, namely a positive electrode terminal 123 and a negative electrode terminal 123. In this battery cell 12, depending on actual usage requirements, the electrode assembly 122 may be single or multiple, and multiple independent electrode assemblies 122 may be disposed within the battery cell 12.

[0129] According to some embodiments of this application, please refer to Figures 4-7 This application provides a battery device 100, which includes a battery cell assembly and a heat insulation pad 13. The battery cell assembly includes a plurality of battery cells 12 arranged along a first direction X. The heat insulation pad 13 is disposed between two adjacent battery cells 12. The heat insulation pad 13 includes a heat insulation core material 131 and a frame 132. The frame 132 surrounds the heat insulation core material 131 and includes a first sub-frame 1321 and a second sub-frame 1322. The compressive strength of the first sub-frame 1321 is less than the compressive strength of the second sub-frame 1322.

[0130] In some embodiments, the battery cell 12 includes a housing 121 and an electrode assembly 122, the electrode assembly 122 being disposed within the housing 121 and having a wound structure.

[0131] In some embodiments, the battery cell 12 includes an electrode assembly 122 disposed within the housing 121, and the electrode assembly 122 has a stacked structure.

[0132] In some embodiments, the frame 132 contacts two adjacent battery cells 12.

[0133] In some embodiments, the heat-insulating core material 131 is in contact with two adjacent battery cells 12.

[0134] In some embodiments, the frame 132 is in contact with the heat insulation core 131. This arrangement allows the frame 132 and the heat insulation core 131 to support each other as a whole, improving the structural stability of the heat insulation pad 13 and reducing the risk of part of the heat insulation pad 13 being squeezed out between two adjacent battery cells 12.

[0135] In some embodiments, there is a gap between the frame 132 and the heat insulation core 131.

[0136] In some embodiments, the battery cell 12 includes a housing 121 and a pressure relief mechanism 125 disposed on the wall of the housing 121. The pressure relief mechanism 125 is an element or component that is actuated to release internal pressure or temperature when the internal pressure, temperature, or other conditions of the battery cell 12 reach a predetermined threshold. This threshold design varies depending on design requirements. The threshold may depend on one or more materials of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 12. The pressure relief mechanism 125 may take the form of an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and may specifically employ a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure, temperature, or other conditions of the battery cell 12 reach the predetermined threshold, the pressure relief mechanism 125 actuates or a weak structure provided in the pressure relief mechanism 125 is destroyed, thereby forming an opening or channel for releasing internal pressure or temperature. Generally, the melting point and / or thickness of the weak structure is lower than other areas of the pressure relief mechanism 125. For example, the weak structure may be a groove or similar groove provided on the surface of the pressure relief mechanism 125. The opening action of the pressure relief mechanism 125 may include, but is not limited to, at least a portion of the pressure relief mechanism 125 rupturing, breaking, tearing, or opening. The opening of the pressure relief mechanism 125 may also be referred to as the actuation of the pressure relief mechanism 125. When the pressure relief mechanism 125 is actuated, the high-temperature, high-pressure material inside the battery cell 12 is discharged outwards from the actuated portion as a discharge. In this way, the battery cell 12 can be depressurized and de-temperatured under controllable pressure or temperature, thereby reducing the possibility of potentially more serious accidents. The discharges from the battery cell 12 mentioned in this application include, but are not limited to, electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature, high-pressure gases generated by the reaction, flames, etc. In the event of thermal runaway of the battery cell 12, the pressure relief mechanism 125 opens, and the provision of the heat insulation core material 131 can reduce the risk of the discharges from the thermally runaway battery cell 12 flowing to the surface of adjacent battery cells 12 in the first direction X, causing thermal runaway of adjacent battery cells 12; in other words, it reduces the risk of thermal runaway propagation.

[0137] In some embodiments, the housing 121 includes a housing 1212 and an end cap 1211. The housing 1212 has an opening, and the end cap 1211 closes the opening. A pressure relief mechanism 125 is disposed at the geometric center of the end cap 1211. This arrangement allows for a larger distance between the pressure relief mechanism 125 of the battery cell 12 and the housing 121 of its adjacent battery cells 12, thereby reducing the risk of emissions moving to adjacent battery cells 12 and causing thermal runaway propagation.

[0138] In some embodiments, one of the first sub-border 1321 and the second sub-border 1322 is in the shape of a straight line and the other is in the shape of a U. The first sub-border 1321 and the second sub-border 1322 together form a square-shaped frame structure.

[0139] In some embodiments, multiple first sub-borders 1321 and multiple second sub-borders 1322 are provided, and the multiple first sub-borders 1321 and multiple second sub-borders 1322 together enclose a frame structure. Adjacent first sub-borders 1321 and adjacent second sub-borders 1322 are arranged at an angle.

[0140] The compressive strength of the first sub-frame 1321 is less than that of the second sub-frame 1322, meaning that the first sub-frame 1321 is more prone to deformation than the second sub-frame 1322 when subjected to external force. Under pressure, the second sub-frame 1322 is less likely to fail than the first sub-frame 1321.

[0141] In the technical solution of this application embodiment, the heat insulation core material 131 can, to a certain extent, block heat transfer between two adjacent battery cells 12, reducing the risk of heat concentration in the battery cell assembly leading to a decrease in the reliability of the battery cell 12. For example, when a battery cell 12 in the battery cell assembly experiences thermal runaway, the heat insulation core material 131 can reduce the risk that the thermally runaway battery cell 12 will trigger other battery cells 12 to also experience thermal runaway, thus reducing the risk of thermal runaway propagation in the battery device 100. Since the frame 132 surrounds the heat insulation core material 131, the two can serve as assembly references for each other, simplifying the assembly difficulty of the heat insulation pad 13. Since the first sub-frame 1321 and the second sub-frame 1322 of the frame 132 are made of materials with different compressive strengths, on the one hand, the first sub-frame 1321 and the second sub-frame 1322 with different compressive strengths can be selectively configured in areas of different deformation ranges of the battery cell 12. This design allows the frame 132 to maintain excellent overall cushioning performance while reducing excessive wear on the frame's cushioning capacity caused by the deformation of the battery cell 12, thereby lowering the risk of damage and reduced lifespan of the frame 132. As a result, the heat insulation pad 13 can maintain good cushioning performance throughout the battery device 100's service life, thus improving the reliability of the battery device 100. Furthermore, it allows for comprehensive consideration of the specific design requirements of the battery cell 12, ensuring that the battery cell 12 achieves good cushioning performance while maintaining low manufacturing costs, thus balancing the performance and cost of the battery cell 12.

[0142] According to some embodiments of this application, please refer to Figures 4-7 There are two first sub-borders 1321 and two second sub-borders 1322. The two first sub-borders 1321 are spaced apart along the third direction Z, and the two second sub-borders 1322 are spaced apart along the second direction Y. The second direction Y, the third direction Z and the first direction X are perpendicular to each other.

[0143] In some embodiments, there is a gap between the first end of the first sub-border 1321 and the second sub-border 1322, and a gap between the other end of the second sub-border 1322 and the other end of the second sub-border 1322.

[0144] In some embodiments, there is a gap between the first end of the first sub-frame 1321 and the second sub-frame 1322, and the other end of the second sub-frame 1322 contacts the other end of the second sub-frame 1322.

[0145] In the above scheme, since the two first sub-frames 1321 are spaced apart along the third direction Z and the two second sub-frames 1322 are spaced apart along the second direction Y, the deformation force of the battery cell 12 can be distributed to multiple areas, reducing the risk of excessive deformation and failure of the frame 132 due to excessive force at a single point. At the same time, this arrangement buffers most of the area between two adjacent battery cells 12 while reserving a larger space for arranging the heat insulation core material 131, making full use of the limited space between the two battery cells 12 to improve the reliability of the battery device 100. In addition, the first sub-frames 1321 and the second sub-frames 1322 can serve as assembly references for each other, and by using the first direction X as a reference, the assembly difficulty of the heat insulation pad 13 can be further reduced.

[0146] According to some embodiments of this application, please refer to Figures 4-7 The first sub-border 1321 extends along the second direction Y, and the second sub-border 1322 extends along the third direction Z.

[0147] The first sub-border 1321 extends along the second direction Y, which means that the length direction of the projection of the first sub-border 1321 onto the first direction X is the second direction Y.

[0148] The second sub-border 1322 extends along the third direction Z, which means that the length direction of the projection of the second sub-border 1322 in the first direction X is the second direction Y.

[0149] In the above scheme, the extension direction of the first sub-frame 1321 is perpendicular to the extension direction of the second sub-frame 1322, which allows the frame 132 to have a larger buffer area while reducing space waste. In addition, it can also disperse the impact force in multiple directions, reducing the risk of stress concentration.

[0150] According to some embodiments of this application, please refer to Figures 4-7 The first sub-border 1321 contacts the two second sub-borders 1322 at both ends along the second direction Y.

[0151] In some embodiments, please refer to Figure 6 The two first sub-frames 1321 have first side faces arranged opposite each other along the third direction Z, and the second sub-frame 1322 has two first end faces arranged opposite each other along the third direction Z. The two first end faces correspond to and contact the two first side faces one by one.

[0152] In some embodiments, please refer to Figure 7 The first sub-frame 1321 has two second end faces arranged opposite each other along the second direction Y, and the two second sub-frames 1322 have two second side faces arranged opposite each other along the second direction Y. The two second end faces and the two second side faces correspond to and contact each other.

[0153] In the above scheme, the first sub-frame 1321 and the second sub-frame 1322 can support each other to form a more stable frame 132. In this way, when the battery cell 12 deforms, the risk of the frame 132 being squeezed out between adjacent battery cells 12, causing the heat insulation pad 13 to fail, can be reduced.

[0154] According to some embodiments of this application, please refer to Figures 4-7 The dimension of the battery cell 12 along the second direction Y is greater than the dimension of the battery cell 12 along the third direction Z.

[0155] The dimension of the battery cell 12 along the second direction Y is greater than the dimension of the battery cell 12 along the third direction Z, which means that the dimension of the battery cell 12 along the second direction Y is the maximum dimension of the battery cell 12 in the first direction X, the second direction Y and the third direction Z.

[0156] In the above scheme, since the size of the battery cell 12 along the second direction Y is larger than the size of the battery cell 12 along the third direction Z, the bending or arching amplitude of the battery cell 12 along the second direction Y is larger, while the bending or arching amplitude along the third direction Z is smaller. By setting the extension direction of the first sub-frame 1321 with lower compression strength to be consistent with the second direction Y, and setting the extension direction of the second sub-frame 1322 with higher compression strength to be consistent with the third direction Z, the first sub-frame 1321 and the second sub-frame 1322 can have a longer service life while performing optimal compression performance.

[0157] According to some embodiments of this application, please refer to Figures 3-7 The battery cell 12 includes an electrode assembly 122, which has a wound structure and the winding axis of the electrode assembly 122 is parallel to the third direction Z.

[0158] The flat region is the flat part of the electrode sheet of the electrode assembly 122. If the electrode assembly 122 is a wound structure, the electrode sheet of the electrode assembly 122 also has a corner region. The electrode sheet has a corner region at least at one end along the direction intersecting with the flat region. The stacking direction of the flat region of the electrode sheet is parallel to the first direction X and perpendicular to the third direction Z.

[0159] The first side is formed at the intersection of the straight area and the corner area along the second direction Y. The two opposite edges of the straight area along the third direction Z are the second side. Since the electrode in the corner area is arc-shaped and the electrode in the straight area is straight, when the electrode assembly 122 deforms, the arc-shaped segment can better adapt to and distribute the load due to its curvature change, thereby reducing deformation. The straight segment may produce greater deformation due to stress concentration. Therefore, in the electrode assembly 122 with multiple layers of electrode sheets, the area near the first side of the electrode assembly 122 has a smaller degree of bending or arching, while the area near the second side has a larger degree of bending or arching.

[0160] In the above scheme, since the electrode assembly 122 has a wound structure, the electrode assembly 122 bends or arches more along the second direction Y and less along the third direction Z. By setting the extension direction of the first sub-frame 1321 with lower compressive strength to be consistent with the second direction Y, and setting the extension direction of the second sub-frame 1322 with higher compressive strength to be consistent with the third direction Z, the first sub-frame 1321 and the second sub-frame 1322 can have a longer service life while achieving the best compression performance.

[0161] According to some embodiments of this application, please refer to Figures 4-9 The battery cell 12 includes a casing 121, a first insulating member 126, and a second insulating member 127. The casing 121 includes a first wall 1213, a second wall 1214, and a side wall 1215. The first wall 1213 and the second wall 1214 are disposed opposite each other along a third direction Z. The side wall 1215 surrounds the first wall 1213 and the second wall 1214. The first insulating member 126 covers a portion of the outer surface of the first wall 1213 and has a first surface 1261 away from the second wall 1214 along the third direction Z. The second insulating member 127 includes a body 1271 that covers the outer surface of the side wall 1215. A heat insulation pad 13 is disposed on the surface of the body 1271 perpendicular to the first direction X. The body 1271 has a second surface 12711 away from the first wall 1213 along the third direction Z. Wherein, along the third direction Z, the minimum distance between the border 132 and the first surface 1261 is L1, which satisfies: 0 < L1 ≤ 5 mm, and / or, along the third direction Z, the minimum distance between the border 132 and the second surface 12711 is L2, which satisfies: 0 < L2 ≤ 5 mm.

[0162] In some embodiments, the first wall 1213 has adjacent first and second edges, and the second insulating member 127 includes a main body 1271, a first flange 1272, and a second flange 1273. The main body 1271 covers the outer surface of the side wall 1215. The first flange 1272 and the second flange 1273 are disposed on the outer surface of the first wall 1213. The first flange 1272 is disposed along the first edge, and the second flange 1273 is disposed along the second edge. The first edge extends along a first direction X, and the second edge extends along a second direction Y. The first insulating member 126 covers at least a portion of the first flange 1272 and at least a portion of the second flange 1273. In other embodiments, the first flange 1272 and the second flange 1273 form an overlapping area at the corner of the first and second edges, and the first insulating member 126 covers the overlapping area.

[0163] In some embodiments, please refer to Figure 8 The first wall 1213 has adjacent first and second edges. The second insulating member 127 includes a main body 1271, a first flange 1272, and a second flange 1273. The main body 1271 covers the outer surface of the side wall 1215. The first flange 1272 and the second flange 1273 are disposed on the outer surface of the first wall 1213. The first flange 1272 is disposed along the first edge, and the second flange 1273 is disposed along the second edge. The first edge extends along a first direction X, and the second edge extends along a second direction Y. The first insulating member 126 covers at least a portion of the second flange 1273. The edge of the first insulating member 126 in the second direction Y, a portion of the first flange 1272, and a portion of the second flange 1273 enclose a hollow area. The first wall 1213 forms an exposed area at the position corresponding to the hollow area. The exposed area is used for connection with the housing assembly. For example, the housing assembly can be a pressure strip.

[0164] In some embodiments, the battery cell 12 further includes a third insulating member that covers the outer surface of the second wall 1214. In some embodiments, the third insulating member and the second insulating member 127 are integrally formed.

[0165] In some embodiments, the first insulating member 126 is provided with a first through hole and a second through hole. In the same projection plane perpendicular to the thickness direction of the first wall 1213, the orthographic projection of the electrode terminal 123 is located in the first through hole, and the orthographic projection of the pressure relief mechanism 125 is located in the second through hole.

[0166] Along the third direction Z, the minimum distance between the border 132 and the first surface 1261 can be any value between 0 and 5 mm, such as any point value or a range between any two of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm.

[0167] Along the third direction Z, the minimum distance between the border 132 and the second surface 12711 can be any value between 0 and 5 mm, such as any point value or a range between any two of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0168] In the above scheme, when L1 > 0, a certain assembly space can be reserved between the frame 132 and the first surface 1261 to reduce the assembly difficulty of the frame 132; when L1 ≤ 5mm, it is beneficial to make the frame 132 have a larger area, thereby increasing the area of ​​the heat insulation pad 13 buffer area, reducing the risk of damage to adjacent battery cells 12 due to deformation of the battery cell 12, and making the battery device 100 have higher reliability; therefore, when 0 < L1 ≤ 5mm, while reducing the assembly difficulty of the frame 132, the battery device 100 can also have higher reliability.

[0169] According to some embodiments of this application, please refer to Figures 4-9 The battery cell 12 includes a housing 121 and a second insulating member 127. The housing 121 includes a first wall 1213, a second wall 1214 and a side wall 1215. The first wall 1213 and the second wall 1214 are arranged opposite each other along a third direction Z. The side wall 1215 surrounds the first wall 1213 and the second wall 1214. The side wall 1215 includes two third walls 12151 arranged opposite each other along a second direction Y, two fourth walls 12152 arranged opposite each other along a first direction X and a plurality of transition walls 12153. The third walls 12151 and the fourth walls 12152 are connected by the transition walls 12153. The second insulating member 127 includes a main body 1271, which includes a first part 12712, a second part 12713, and a transition part 12714. The first part 12712 covers a third wall 12151, the second part 12713 covers a fourth wall 12152, and the transition part 12714 covers a transition wall 12153. A heat insulation pad 13 is disposed on the surface of the second part 12713 perpendicular to the first direction X. Along the second direction Y, the second part 12713 has a first edge 127131 and a second edge 127132 disposed opposite to each other. The minimum distance between the frame 132 and the first edge 127131 along the second direction Y is L3, satisfying: 0 < L3 ≤ 5 mm; and / or, the minimum distance between the frame 132 and the second edge 127132 along the second direction Y is L4, satisfying: 0 < L4 ≤ 5 mm.

[0170] Along the second direction Y, the minimum distance between the border 132 and the first edge 127131 can be any value between 0 and 5mm, such as any point value or a range between any two of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm.

[0171] Along the second direction Y, the minimum distance between the border 132 and the second edge 127132 can be any value greater than 0 and less than or equal to 5mm, such as any one of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or any range between two of them.

[0172] In the above scheme, when L3 > 0, a certain assembly space can be reserved between the frame 132 and the first edge 127131 to reduce the assembly difficulty of the frame 132; when L3 ≤ 5mm, it is beneficial to make the frame 132 have a larger area, thereby increasing the area of ​​the heat insulation pad 13 buffer area, reducing the risk of damage to adjacent battery cells 12 due to deformation of the battery cell 12, and making the battery device 100 have higher reliability; therefore, when 0 < L3 ≤ 5mm, while reducing the assembly difficulty of the frame 132, the battery device 100 can also have higher reliability.

[0173] When L4 > 0, a certain assembly space can be reserved between the frame 132 and the second edge 127132, reducing the assembly difficulty of the frame 132; when L4 ≤ 5mm, it is beneficial to make the frame 132 have a larger area, thereby increasing the area of ​​the heat insulation pad 13 buffer area, reducing the risk of damage to adjacent battery cells 12 due to deformation of the battery cell 12, and making the battery device 100 have higher reliability; therefore, when 0 < L4 ≤ 5mm, while reducing the assembly difficulty of the frame 132, the battery device 100 can also have higher reliability.

[0174] According to some embodiments of this application, please refer to Figures 3-7 The battery cell 12 includes an electrode assembly 122, which includes a tab 1221. In the same projection plane perpendicular to the first direction X, the orthographic projection of the frame 132 and the orthographic projection of the tab 1221 do not overlap.

[0175] In some embodiments, the battery cell 12 includes electrode terminals 123 and an adapter 124. The tab 1221 is electrically connected to the adapter 124, and the adapter 124 is electrically connected to the electrode terminals 123, so as to draw electrical energy from the electrode assembly 122. Since the orthographic projection of the frame 132 and the orthographic projection of the tab 1221 do not overlap in the same projection plane perpendicular to the first direction X, the tab 1221 and the adapter 124 can have high connection stability.

[0176] In some embodiments, the battery cell 12 includes an electrode terminal 123, and a tab 1221 is electrically connected to the electrode terminal 123 to draw electrical energy from the electrode assembly 122. Since the orthographic projection of the frame 132 and the orthographic projection of the tab 1221 do not overlap in the same projection plane perpendicular to the first direction X, a high degree of connection stability can be achieved between the tab 1221 and the electrode terminal 123.

[0177] In the above scheme, since the orthographic projection of the frame 132 and the orthographic projection of the tab 1221 do not overlap in the same projection plane perpendicular to the first direction X, the risk of the reaction force of the frame 132 acting on the tab 1221 causing the tab 1221 to fail is low, and the reliability of the battery cell 12 is high.

[0178] According to some embodiments of this application, please refer to Figures 3-7 The surface of the battery cell 12 perpendicular to the first direction X is the surface with the largest area of ​​the battery cell 12.

[0179] When the battery cell 12 deforms, the wall containing the largest surface area deforms more than the wall containing other surfaces, and is more likely to absorb heat and cause the battery cell 12 to heat up rapidly.

[0180] In the above scheme, since the surface with the largest area of ​​the battery cell 12 has a large deformation range, and the temperature of the battery cell 12 rises faster when heat is transferred to the surface with the largest area of ​​the battery cell 12, placing the heat insulation pad 13 between the surfaces with the largest areas of two adjacent battery cells 12 can significantly improve the reliability of the electrical device.

[0181] According to some embodiments of this application, please refer to Figures 3-7 The width of the first sub-border 1321 is W1, which satisfies: 6mm≤W1≤8mm.

[0182] The width of the first sub-border 1321 refers to the width of the projection of the first sub-border 1321 along the first direction X.

[0183] The width of the first sub-border 1321 can be any value between 6mm and 8mm, such as any one of the following values ​​or a range between any two: 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm, 7mm, 7.2mm, 7.4mm, 7.6mm, 7.8mm, 8mm.

[0184] In the above scheme, when W1≥6mm, the first sub-frame 1321 can have a larger buffer area, so that the heat insulation pad 13 has better buffer performance; when W1≤8mm, it is beneficial to make more space to arrange the heat insulation core material 131, so that the heat insulation pad 13 can have better heat insulation performance; therefore, when 6mm≤W1≤8mm, the heat insulation pad 13 can take into account both good buffer performance and heat insulation performance.

[0185] According to some embodiments of this application, please refer to Figures 3-7 The width of the second sub-border 1322 is W2, which satisfies: 8mm≤W2≤10mm.

[0186] The width of the second sub-border 1322 refers to the width of the projection of the second sub-border 1322 along the first direction X.

[0187] The width of the second sub-border 1322 can be any value between 8mm and 10mm, such as any one of the following values ​​or a range between any two: 8mm, 8.2mm, 8.4mm, 8.6mm, 8.8mm, 9mm, 9.2mm, 9.4mm, 9.6mm, 9.8mm, 10mm.

[0188] In the above scheme, when W2≥8mm, the second sub-frame 1322 can have a larger buffer area, so that the heat insulation pad 13 has better buffer performance; when W2≤10mm, it is beneficial to make more space to arrange the heat insulation core material 131, so that the heat insulation pad 13 can have better heat insulation performance; therefore, when 8mm≤W1≤10mm, the heat insulation pad 13 can take into account both good buffer performance and heat insulation performance.

[0189] According to some embodiments of this application, the material of the first sub-frame 1321 includes one or more of silicone foam and microporous foamed polypropylene.

[0190] According to some embodiments of this application, the material of the second sub-frame 1322 includes one or more of melamine and hard rubber.

[0191] According to some embodiments of this application, the material of the thermal insulation core 131 includes one or more of mica and aerogel.

[0192] According to some embodiments of this application, please refer to Figures 3-7 The two adjacent battery cells 12 include a first battery cell 12 and a second battery cell 12. The heat insulation pad 13 also includes a first adhesive layer 133, and the frame 132 and the heat insulation core material 131 are bonded to the first battery cell 12 through the first adhesive layer 133.

[0193] In some embodiments, the first adhesive layer 133 may be the sticky part remaining after the release paper of the double-sided tape is separated.

[0194] In some embodiments, the first adhesive layer 133 may be an adhesive layer formed by a colloid.

[0195] In some embodiments, the first adhesive layer 133 may be rectangular.

[0196] In some embodiments, the first adhesive layer 133 may be in a zigzag shape.

[0197] In the above solution, the setting of the first adhesive layer 133 can improve the connection stability between the frame 132, the heat insulation core material 131 and the first battery cell 12.

[0198] According to some embodiments of the present application, please refer to Figures 3-7 , in the same projection plane perpendicular to the first direction X, the orthographic projection of the first adhesive layer 133 and the orthographic projection of the heat insulation core material 131 at least partially overlap, the orthographic projection of the first adhesive layer 133 and the orthographic projection of the first sub-frame 1321 at least partially overlap, and the orthographic projection of the first adhesive layer 133 and the orthographic projection of the second sub-frame 1322 at least partially overlap.

[0199] Compared with the case where an adhesive layer is separately provided for each first sub-frame 1321, the above setting can complete the assembly of the heat insulation core material 131, the first sub-frame 1321 and the second sub-frame 1322 through one adhesive operation.

[0200] In the above solution, since the first adhesive layer 133 simultaneously adheres the heat insulation core material 131, the first sub-frame 1321 and the second sub-frame 1322, the assembly of the heat insulation core material 131, the first sub-frame 1321 and the second sub-frame 1322 with the first battery cell 12 can be completed through one adhesive operation, improving the assembly efficiency of the heat insulation pad 13.

[0201] According to some embodiments of the present application, please refer to Figures 3-7 , the heat insulation pad 13 further includes a second adhesive layer 134, and the frame 132 and the heat insulation core material 131 are adhered to the second battery cell 12 through the second adhesive layer 134.

[0202] In some embodiments, the second adhesive layer 134 may be the sticky part remaining after the release paper of the double-sided tape is separated.

[0203] In some embodiments, the second adhesive layer 134 may be an adhesive layer formed by a colloid.

[0204] In the above solution, the setting of the second adhesive layer 134 can further improve the connection stability between the frame 132, the heat insulation core material 131 and the first battery cell 12.

[0205] According to some embodiments of the present application, please refer to Figures 3-7 , in the same projection plane perpendicular to the first direction X, the orthographic projection of the second adhesive layer 134 at least partially overlaps with the orthographic projection of the heat insulation core 131, the orthographic projection of the second adhesive layer 134 at least partially overlaps with the orthographic projection of the first sub-frame 1321, and the orthographic projection of the second adhesive layer 134 at least partially overlaps with the orthographic projection of the second sub-frame 1322.

[0206] In some embodiments, the second adhesive layer 134 may be rectangular.

[0207] In some embodiments, the second adhesive layer 134 may be in a double-square shape.

[0208] In the above solution, while further improving the connection stability between the frame 132 and the heat insulation core 131 and the first battery cell 12, the heat insulation pad 13 can have a high assembly efficiency.

[0209] According to some embodiments of the present application, please refer to Figures 3-7 and Figure 10 , the electrical device further includes a box body 11, and the battery cell assembly is disposed in the box body 11. The box body 11 includes a first limiting member 113 and a second limiting member 114, the first limiting member 113 and the second limiting member 114 are spaced along the first direction X, and the battery cell assembly is disposed between the first limiting member 113 and the second limiting member 114.

[0210] The first limiting member 113 and the second limiting member 114 are used to resist the expansion force of the battery cell 12.

[0211] In some embodiments, the plurality of battery cells 12 include a first end battery cell 12 and a second end battery cell 12 located at both ends in the first direction X, a buffer pad is disposed between the first end battery cell 12 and the first limiting member 113, and the buffer pad is used to absorb the assembly tolerance in the first direction X; and / or, a buffer pad is disposed between the second end battery cell 12 and the second limiting member, and the buffer pad is used to absorb the assembly tolerance in the first direction X.

[0212] In some embodiments, the box body 11 may further include a support member for carrying the battery cell 12, and both the first limiting member 113 and the second limiting member 114 are disposed on the support member.

[0213] Taking the assembly of multiple battery cells 12 along the third direction Z between the first limiting member 113 and the second limiting member 114 as an example, since the compressive strength of the first sub-frame 1321 is less than that of the second sub-frame 1322, when the distance between two adjacent battery cells 12 is constant, the first sub-frame 1321 can be compressed more along the first direction X, and the total size of the multiple battery cells 12 along the first direction X can be compressed more, making it easier for the multiple battery cells 12 to be assembled as a whole between the first limiting member 113 and the second limiting member 114.

[0214] In the above scheme, since the compressive strength of the first sub-frame 1321 is less than that of the second sub-frame 1322, the battery cell assembly can be more easily installed between the first limiting member 113 and the second limiting member 114 along the extension direction perpendicular to the first sub-frame 1321 and perpendicular to the first direction X, thereby reducing the assembly difficulty of the battery cell assembly.

[0215] According to some embodiments of this application, please refer to Figure 5 This application provides a heat insulation pad 13, which includes an intermediate layer 130, a first adhesive layer 133, and a first release paper 135. The intermediate layer 130 includes a heat insulation core material 131 and a frame 132. The frame 132 surrounds the heat insulation core material 131 and includes a first sub-frame 1321 and a second sub-frame 1322. The compressive strength of the first sub-frame 1321 is less than the compressive strength of the second sub-frame 1322. The first adhesive layer 133 is disposed on one side of the intermediate layer 130 in the thickness direction. The first release paper 135 is disposed on the side of the first adhesive layer 133 opposite to the intermediate layer 130.

[0216] In some embodiments, the first release paper 135 may include a covering portion and a separating portion, the covering portion covering the first adhesive layer 133, the separating portion protruding from the covering portion and not overlapping with the first adhesive layer 133, and an operator or operating device may grasp the separating portion to separate the first adhesive layer 133 and the first release paper 135.

[0217] In the above scheme, the first sub-frame 1321, the second sub-frame 1322, the heat insulation core material 131, and the first release paper 135 can be supplied as a single unit. On the one hand, this reduces the risk of the heat insulation pad 13 displacing due to the separation of the first sub-frame 1321, the second sub-frame 1322, and the heat insulation core material 131, leading to its failure in heat insulation and cushioning performance, thus giving the heat insulation pad 13 higher structural stability. On the other hand, after separating the first release paper 135 and the first adhesive layer 133, the bonding operation of the first sub-frame 1321, the second sub-frame 1322, and the heat insulation core material 131 can be completed in one step, improving the assembly efficiency of the heat insulation pad 13.

[0218] According to some embodiments of this application, please refer to Figure 5The heat insulation pad 13 also includes a second adhesive layer 134 and a second release paper 136. The second adhesive layer 134 is disposed on the opposite side of the thickness direction of the intermediate layer 130. The second release paper 136 is disposed on the side of the second adhesive layer 134 away from the intermediate layer 130.

[0219] In some embodiments, the second release paper 136 may include a covering portion and a separating portion, the covering portion covering the second adhesive layer 134, the separating portion protruding from the covering portion and not overlapping with the second adhesive layer, and an operator or operating device may grasp the separating portion to separate the second adhesive layer 134 and the second release paper 136.

[0220] In the above scheme, while enabling the heat insulation pad 13 to have high assembly efficiency, the provision of the second adhesive layer 134 and the second release paper 136 can further improve the structural stability of the heat insulation pad 13 before and after assembly, as well as the connection stability of the heat insulation pad 13 after assembly.

[0221] According to some embodiments of this application, please refer to Figure 1 This application provides an electrical device that includes the battery device 100 in one or more of the above embodiments, the battery device 100 being used to provide electrical energy.

[0222] In the above solutions, since the battery device 100 in one or more of the above embodiments has high reliability, the power-consuming device including the battery device 100 in one or more of the above embodiments also has high reliability.

[0223] According to some embodiments of this application, please refer to Figures 3-6 This application provides a battery device 100, which includes a battery cell assembly and a heat insulation pad 13. The battery cell assembly includes a plurality of battery cells 12 arranged along a first direction X. The dimension of the battery cell 12 along a second direction Y is larger than the dimension of the battery cell 12 along a third direction Z. The battery cell 12 includes an electrode assembly 122, which has a wound structure, and the winding axis of the electrode assembly 122 is parallel to the third direction Z. The surface of the battery cell 12 perpendicular to the first direction X is the surface with the largest area of ​​the battery cell 12.

[0224] A heat insulation pad 13 is disposed between two adjacent battery cells 12. The heat insulation pad 13 includes a heat insulation core material 131 and a frame 132. The frame 132 surrounds the heat insulation core material 131 and includes a first sub-frame 1321 and a second sub-frame 1322. The first sub-frame 1321 is made of microporous foamed polypropylene, and the second sub-frame 1322 is made of hard rubber. The heat insulation core material 131 is made of aerogel.

[0225] There are two first sub-borders 1321 and two second sub-borders 1322. The two first sub-borders 1321 are spaced apart along the third direction Z, and the two second sub-borders 1322 are spaced apart along the second direction Y. The second direction Y, the third direction Z, and the first direction X are all perpendicular to each other. The first sub-borders 1321 extend along the second direction Y, and the second sub-borders 1322 extend along the third direction Z. The two ends of the first sub-borders 1321 along the second direction Y respectively contact the two second sub-borders 1322.

[0226] Two adjacent battery cells 12 include a first battery cell 12 and a second battery cell 12. The heat insulation pad 13 also includes a first adhesive layer 133, through which the frame 132 and the heat insulation core material 131 are bonded to the first battery cell 12. In the same projection plane perpendicular to the first direction X, the orthographic projection of the first adhesive layer 133 at least partially overlaps with the orthographic projection of the heat insulation core material 131, at least partially overlaps with the orthographic projection of the first sub-frame 1321, and at least partially overlaps with the orthographic projection of the second sub-frame 1322. The heat insulation pad 13 also includes a second adhesive layer 134, through which the frame 132 and the heat insulation core material 131 are bonded to the second battery cell 12. In the same projection plane perpendicular to the first direction X, the orthographic projection of the second adhesive layer 134 at least partially overlaps with the orthographic projection of the heat insulation core material 131, the orthographic projection of the second adhesive layer 134 at least partially overlaps with the orthographic projection of the first sub-frame 1321, and the orthographic projection of the second adhesive layer 134 at least partially overlaps with the orthographic projection of the second sub-frame 1322.

[0227] Taking the first adhesive layer 133 and the second adhesive layer as examples, both of which are adhesive parts of double-sided adhesive, during the assembly of the heat insulation pad 13, the release paper of the double-sided adhesive is separated, and the heat insulation pad 13 can be assembled to one side of the battery cell 12, that is, the assembly of the first sub-frame 1321, the second sub-frame 1322 and the heat insulation core material 131 is completed at the same time.

[0228] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A battery cell assembly includes multiple battery cells arranged along a first direction; A heat insulation pad is disposed between two adjacent battery cells; The heat insulation pad includes a heat insulation core material and a frame. The frame surrounds the heat insulation core material and includes a first sub-frame and a second sub-frame. The compressive strength of the first sub-frame is less than that of the second sub-frame.

2. The battery device according to claim 1, characterized in that, There are two first sub-borders and two second sub-borders. The two first sub-borders are spaced apart along a third direction, and the two second sub-borders are spaced apart along a second direction. The second direction, the third direction, and the first direction are perpendicular to each other.

3. The battery device according to claim 2, characterized in that, The first sub-border extends along the second direction, and the second sub-border extends along the third direction.

4. The battery device according to claim 3, characterized in that, The first sub-border edge contacts the two second sub-border edges at both ends along the second direction.

5. The battery device according to claim 3, characterized in that, The dimension of the battery cell along the second direction is greater than the dimension of the battery cell along the third direction.

6. The battery device according to claim 3, characterized in that, The battery cell includes an electrode assembly, which has a wound structure, and the winding axis of the electrode assembly is parallel to the third direction.

7. The battery device according to claim 2, characterized in that, The battery cell includes: The outer casing includes a first wall, a second wall, and a side wall, wherein the first wall and the second wall are disposed opposite each other along the third direction, and the side wall surrounds the first wall and the second wall; A first insulating element, the first insulating element covering the outer surface of the first wall, and along the third direction, the first insulating element having a first surface away from the second wall; The second insulating member includes a body that covers the outer surface of the sidewall, and a heat insulation pad disposed on a surface of the body perpendicular to the first direction. Along the third direction, the body has a second surface away from the first wall. Wherein, along the third direction, the minimum distance between the border and the first surface is L1, satisfying: 0 < L1 ≤ 5mm, and / or, along the third direction, the minimum distance between the border and the second surface is L2, satisfying: 0 < L2 ≤ 5mm.

8. The battery device according to claim 2, characterized in that, The battery cell includes: The outer shell includes a first wall, a second wall, and a side wall. The first wall and the second wall are disposed opposite each other along the third direction. The side wall surrounds the first wall and the second wall. The side wall includes two third walls disposed opposite each other along the second direction, two fourth walls disposed opposite each other along the first direction, and a plurality of transition walls. The third walls and the fourth walls are connected by the transition walls. The second insulating member includes a body, the body including a first part, a second part and a transition portion, the first part covering the third wall, the second part covering the fourth wall, the transition portion covering the transition wall, the heat insulation pad being disposed on the surface of the second part perpendicular to the first direction, and the second part having a first edge and a second edge disposed opposite to each other along the second direction; Wherein, along the second direction, the minimum distance between the frame and the first edge is L3, satisfying: 0 < L3 ≤ 5mm; and / or, along the second direction, the minimum distance between the frame and the second edge is L4, satisfying: 0 < L4 ≤ 5mm.

9. The battery device according to claim 1, characterized in that, The battery cell includes an electrode assembly, and the electrode assembly includes tabs; Within the same projection plane perpendicular to the first direction, the orthographic projection of the frame does not overlap with the orthographic projection of the tab.

10. The battery device according to claim 1, characterized in that, The surface of the battery cell perpendicular to the first direction is the surface with the largest area of ​​the battery cell.

11. The battery device according to claim 1, characterized in that, The width of the first sub-border is W1, which satisfies: 6mm≤W1≤8mm.

12. The battery device according to claim 1, characterized in that, The width of the second sub-border is W2, which satisfies: 8mm≤W2≤10mm.

13. The battery device according to claim 1, characterized in that, The material of the first sub-frame includes one or more of silicone foam and microporous foamed polypropylene.

14. The battery device according to claim 1, characterized in that, The material of the second sub-frame includes one or more of melamine and hard rubber.

15. The battery device according to claim 1, characterized in that, The material of the thermal insulation core includes one or more of mica and aerogel.

16. The battery device according to claim 1, characterized in that, Two adjacent battery cells include a first battery cell and a second battery cell; The heat insulation pad also includes a first adhesive layer, through which the frame and the heat insulation core are bonded to the first battery cell.

17. The battery device according to claim 16, characterized in that, In the same projection plane perpendicular to the first direction, the orthographic projection of the first adhesive layer at least partially overlaps with the orthographic projection of the thermal insulation core material, the orthographic projection of the first adhesive layer at least partially overlaps with the orthographic projection of the first sub-frame, and the orthographic projection of the first adhesive layer at least partially overlaps with the orthographic projection of the second sub-frame.

18. The battery device according to claim 16, characterized in that, The heat insulation pad also includes a second adhesive layer, through which the frame and the heat insulation core are bonded to the second battery cell.

19. The battery device according to claim 18, characterized in that, In the same projection plane perpendicular to the first direction, the orthographic projection of the second adhesive layer at least partially overlaps with the orthographic projection of the thermal insulation core material, the orthographic projection of the second adhesive layer at least partially overlaps with the orthographic projection of the first sub-frame, and the orthographic projection of the second adhesive layer at least partially overlaps with the orthographic projection of the second sub-frame.

20. The battery device according to claim 1, characterized in that, The battery device also includes a housing, and the battery cell assembly is disposed within the housing; The housing includes a first limiting member and a second limiting member, which are spaced apart along the first direction, and the battery cell assembly is disposed between the first limiting member and the second limiting member.

21. A heat insulation pad, characterized in that, include: The intermediate layer includes a heat insulation core material and a frame, the frame surrounding the heat insulation core material, the frame including a first sub-frame and a second sub-frame, the compressive strength of the first sub-frame being less than the compressive strength of the second sub-frame. The first adhesive layer is disposed on one side of the thickness direction of the intermediate layer; The first release paper is disposed on the side of the first adhesive layer opposite to the intermediate layer.

22. The heat insulation pad according to claim 21, characterized in that, The heat insulation pad also includes: The second adhesive layer is disposed on the other side of the thickness direction of the intermediate layer; The second release paper is disposed on the side of the second adhesive layer opposite to the intermediate layer.

23. An electrical appliance, characterized in that, The electrical device includes a battery device as described in any one of claims 1-20, the battery device being used to provide electrical energy.

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