Battery device and electric device

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery device and a power utilization device. The battery device comprises single batteries and heat insulation pads arranged between the adjacent single batteries, each heat insulation pad comprises a first surface layer, a second surface layer and a heat insulation layer, and a first gap and a second gap are formed between the heat insulation layer and the first surface layer and between the heat insulation layer and the second surface layer respectively. The first gap and the second gap can effectively buffer stress, so that the risk that the heat insulation pad is damaged due to extrusion is reduced, and when the battery monomers expand to extrude the heat insulation pad, due to the existence of the first gap and the second gap, the middle part of the heat insulation pad has a relatively large deformation space, so that the heat insulation pad is prevented from being deformed. The middle part of the heat insulation pad can bear larger extrusion force to adapt to larger expansion deformation in the middle area of the battery monomer, and the service life of the heat insulation structure is prolonged, so that the heat stability of the battery device is higher, and the use reliability is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery device and an electrical device. Background Technology

[0002] Battery temperature is the most important parameter affecting battery performance and is currently a key research focus in battery design.

[0003] A battery cell is the smallest unit that makes up a battery device. When one or more battery cells overheat and thermal runaway occurs, the heat will spread to the surrounding battery cells, causing a large area of ​​battery cells to overheat, which will lead to the instability of the battery device.

[0004] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Utility Model Content

[0005] The purpose of this application is to provide a battery device and an electrical device, including but not limited to solving the technical problem of thermal runaway of the battery device caused by the diffusion of heat to surrounding battery cells when a single battery cell inside the battery device experiences thermal runaway.

[0006] The technical solution adopted in the embodiments of this application is:

[0007] In a first aspect, a battery device is provided, comprising:

[0008] Multiple battery cells;

[0009] A heat insulation pad is placed between two adjacent battery cells;

[0010] The heat insulation pad includes a first surface layer, a second surface layer, and a heat insulation layer disposed between the first surface layer and the second surface layer. There is a first gap between the heat insulation layer and the first surface layer, and a second gap between the heat insulation layer and the second surface layer.

[0011] In the battery device of this application embodiment, a heat insulation pad is disposed between adjacent battery cells. The heat insulation pad includes a first surface layer, a second surface layer, and a heat insulation layer. The heat insulation layer is disposed between the two surface layers and has a first gap with the first surface layer and a second gap with the second surface layer. Thus, when the battery cell expands and compresses the heat insulation pad, the presence of the first and second gaps allows for a larger deformation space in the middle of the heat insulation pad. The middle of the heat insulation pad can withstand greater compressive force to accommodate the larger expansion deformation that may occur in the middle region of the battery cell. This helps to reduce the risk of damage to the heat insulation pad structure due to large deformation in the middle region, thereby extending the service life of the heat insulation structure and improving the heat insulation effect. As a result, it can effectively insulate the adjacent battery cells, making the battery device more thermally stable and improving its reliability.

[0012] In some embodiments, the size of the first gap is 0.5-1.0 μm in the thickness direction of the thermal insulation pad, and / or the size of the second gap is 0.5-1.0 μm.

[0013] By adopting the technical scheme of this embodiment, the first gap and the second gap have appropriate sizes, within the size range, the thermal insulation pad has sufficient deformation space to meet the use requirements, while the thickness of the thermal insulation pad is not too thick to affect the energy density of the battery device.

[0014] In some embodiments, the thermal insulation pad further comprises a first partition and a second partition, the first partition is arranged between the first surface layer and the thermal insulation layer, the second partition is arranged between the second surface layer and the thermal insulation pad, the first surface layer, the first partition and the thermal insulation layer form the first gap, and the second surface layer, the second partition and the thermal insulation pad form the second gap.

[0015] By adopting the technical scheme of this embodiment, the first partition is arranged between the first surface layer and the thermal insulation pad, the space among the first surface layer, the first partition and the thermal insulation pad is the first gap, at the same time, the second partition is arranged between the second surface layer and the thermal insulation pad, the space among the second surface layer, the second partition and the thermal insulation pad is the second gap, thus, the overall structure of the thermal insulation pad is simple and easy to form.

[0016] In some embodiments, the thermal insulation pad comprises a plurality of first partitions, at least opposite sides of the thermal insulation pad are respectively provided with at least one first partition in a direction perpendicular to the thickness direction of the thermal insulation pad.

[0017] By adopting the technical scheme of this embodiment, the first partition is arranged between the first surface layer and the thermal insulation layer at the position of at least opposite sides of the thermal insulation pad, the first partition lifts the first surface layer and makes it not adhere to the thermal insulation layer, thereby forming the first gap between the first surface layer and the thermal insulation layer, thus, by designing the thickness size of the first partition, the size of the first gap can be determined, the first gap is simple to form, and the thermal insulation pad is easy to process and mass produce.

[0018] In some embodiments, the thermal insulation pad comprises a plurality of second partitions, at least opposite sides of the thermal insulation pad are respectively provided with at least one second partition in a direction perpendicular to the thickness direction of the thermal insulation pad.

[0019] By adopting the technical scheme of the embodiment, the second partition piece is arranged between the second surface layer and the heat insulation layer at the position of at least opposite sides of the heat insulation pad, the second partition piece lifts the second surface layer and makes the second surface layer not adhere to the heat insulation layer, thereby forming a second gap between the second surface layer and the heat insulation layer, and thus, the size of the second gap can be determined by designing the thickness size of the second partition piece, the second gap is simple to form, and the heat insulation pad is convenient to process and mass produce.

[0020] In some embodiments, the side edge of the first surface layer is sealingly connected with the side edge of the second surface layer to seal the first gap and the second gap.

[0021] By adopting the technical scheme of the embodiment, the first surface layer and the second surface layer are sealingly connected at the circumferential position, the first surface layer and the second surface layer form a box-shaped structure, and the heat insulation layer is encapsulated in the box-shaped structure formed by the first surface layer and the second surface layer, so that the first surface layer and the second surface layer can well protect the heat insulation layer and encapsulate a certain amount of static air in the first gap and the second gap to improve the overall heat insulation effect of the heat insulation pad.

[0022] In some embodiments, the first partition piece is a ring-shaped piece, the first partition piece is arranged around the side of the heat insulation pad, and the first partition piece is sealingly connected with the first surface layer and the heat insulation layer to seal the first gap.

[0023] By adopting the technical scheme of the embodiment, the first partition piece is arranged as a ring-shaped piece, the first partition piece is arranged around the side of the heat insulation pad, and the first partition piece is sealingly connected with the first surface layer and the heat insulation layer to seal the first gap, so that the first partition piece cooperates with the first surface layer and the second surface layer to protect the heat insulation layer and seal the first gap, and a certain amount of static air can be encapsulated in the first gap to improve the overall heat insulation effect of the heat insulation pad.

[0024] In some embodiments, the second partition piece is a ring-shaped piece, the second partition piece is arranged around the side of the heat insulation pad, and the second partition piece is sealingly connected with the second surface layer and the heat insulation layer to seal the second gap.

[0025] By adopting the technical scheme of the embodiment, the second partition piece is arranged as a ring-shaped piece, the second partition piece is arranged around the side of the heat insulation pad, and the second partition piece is sealingly connected with the second surface layer and the heat insulation layer to seal the second gap, so that the second partition piece cooperates with the first surface layer and the second surface layer to protect the heat insulation layer and seal the second gap, and a certain amount of static air can be encapsulated in the second gap to improve the overall heat insulation effect of the heat insulation pad.

[0026] In some embodiments, the first partition piece is an elastic piece.

[0027] By adopting the technical scheme of the embodiment, the first partition piece is provided as an elastic piece, the first partition piece has a certain deformation capacity, so that the force borne by the thermal insulation pad can be buffered, which is beneficial to improve the buffering effect of the thermal insulation pad on the force and improve the deformation resistance of the thermal insulation pad.

[0028] In some embodiments, the second partition piece is an elastic piece.

[0029] By adopting the technical scheme of the embodiment, the second partition piece is provided as an elastic piece, the second partition piece has a certain deformation capacity, so that the force borne by the thermal insulation pad can be buffered, which is beneficial to improve the buffering effect of the thermal insulation pad on the force and improve the deformation resistance of the thermal insulation pad.

[0030] In some embodiments, along the thickness direction of the thermal insulation pad, the thickness of the first partition piece is 0.5-1.2 μm.

[0031] By adopting the technical scheme of the embodiment, the thickness of the first partition piece is designed within the above thickness range, so that the size of the first gap can fall within the size interval of 0.5-1.0 μm, meeting the size forming requirement of the first gap.

[0032] In some embodiments, along the thickness direction of the thermal insulation pad, the thickness of the second partition piece is 0.5-1.2 μm.

[0033] By adopting the technical scheme of the embodiment, the thickness of the second partition piece is designed within the above thickness range, so that the size of the second gap can fall within the size interval of 0.5-1.0 μm, meeting the size forming requirement of the second gap.

[0034] In some embodiments, the thermal insulation pad further comprises a third partition piece, at least opposite sides of the first face layer and the second face layer are provided with the third partition piece along a direction perpendicular to the thickness direction of the thermal insulation pad, the opposite sides of the thermal insulation layer are connected with the corresponding third partition pieces, the first face layer, a part of the third partition piece and the thermal insulation layer surround to form the first gap, and the second face layer, another part of the third partition piece and the thermal insulation layer surround to form the second gap.

[0035] By adopting the technical scheme of the embodiment, the third partition piece is arranged between the first face layer and the second face layer, a large spacing space is formed among the first face layer, the second face layer and the third partition piece, and then the side edges of the thermal insulation layer are connected with the third partition piece at the middle part of the third partition piece, i.e. the thermal insulation layer is connected to the middle part of the third partition piece, so as to divide the above spacing space into the first gap and the second gap.

[0036] In some embodiments, the middle part of the thermal insulation layer is provided with a buffering structure arranged between the first gap and the second gap.

[0037] By adopting the technical scheme of the embodiment, the buffer structure is arranged at the middle part of the heat insulation layer, the buffer structure is located at the middle part of the heat insulation pad, and the middle part of the heat insulation pad usually corresponds to the position of the battery monomer. Therefore, the arrangement of the buffer structure can further improve the ability of the middle part of the heat insulation pad to resist the extrusion force generated by the expansion and deformation of the battery monomer, so that the middle part of the heat insulation pad can withstand greater extrusion force to adapt to the possible greater expansion and deformation of the middle part of the battery monomer, thereby helping to reduce the risk of damage to the structure of the heat insulation pad due to the large stress deformation of the middle part of the heat insulation pad, further prolonging the service life of the heat insulation structure, and further improving the heat insulation effect.

[0038] In some embodiments, the buffer structure includes a buffer hole, and the buffer hole is in communication with the first gap and the second gap.

[0039] By adopting the technical scheme of the embodiment, the buffer hole is arranged at the middle part of the heat insulation layer to form a buffer structure. When the heat insulation pad is extruded, the buffer hole can deform in time to buffer the extrusion force. Meanwhile, the buffer hole is in communication with the first gap and the second gap, so that air and other substances can flow between the first gap and the second gap. When the heat insulation pad is extruded by force on one side, the buffer hole can provide a flow channel for air and other media in the first gap and the second gap. The flow and redistribution of air can absorb part of the impact energy, thereby enhancing the overall buffering capacity of the buffer structure.

[0040] In some embodiments, the number of buffer holes is multiple, and the multiple buffer holes are uniformly arranged at the middle part of the heat insulation layer.

[0041] By adopting the technical scheme of the embodiment, multiple buffer holes are uniformly arranged at the middle part of the heat insulation pad to ensure that the buffer structure has effective buffering capacity.

[0042] In some embodiments, the aperture of the buffer hole is 0.01mm-1mm.

[0043] By adopting the technical scheme of the embodiment, the aperture of the buffer hole is set in the above-mentioned aperture range. On the one hand, the overall aperture size of the buffer hole is relatively small, so that the air flow speed in the first gap and the second gap is relatively slow, and the heat convection speed is slow, thereby helping to control the conduction speed of heat through the buffer hole and being beneficial to improving the overall heat insulation effect of the heat insulation pad. On the other hand, the buffer hole with a smaller size can also have sufficient deformation capacity to resist external force.

[0044] In some embodiments, the sum of the cross-sectional areas of the buffer holes is less than or equal to one-tenth of the surface area of the heat insulation layer.

[0045] By adopting the technical scheme of the embodiment, the sum of the areas of the sections of the buffer hole is controlled within a certain range while ensuring that the buffer hole has sufficient buffering function, so as to ensure that the heat insulation layer can still effectively block the transmission of most heat, and ensure that the heat insulation pad has stable heat insulation performance.

[0046] In some embodiments, the buffer structure includes a thinned region, the thickness of the thinned region being less than the thickness of the heat insulation layer at other locations.

[0047] By adopting the technical scheme of the embodiment, the thickness of the thinned region is less than the thickness of the heat insulation layer at other locations, that is, the thinned region forms a relatively weak region in structure, and compared with other parts of the heat insulation layer, the thinned region has a smaller thickness, so that the thinned region is more likely to deform when subjected to external pressure or impact, thereby enabling the middle part of the heat insulation layer to have better buffering effect.

[0048] In some embodiments, the heat insulation layer is a composite layer of a fiber material and a porous powder ceramic.

[0049] By adopting the technical scheme of the embodiment, the fiber material generally has good flexibility and tensile strength, and can enhance the overall mechanical properties of the heat insulation layer to a certain extent. In addition, the interwoven structure of the fiber material can effectively block the conduction of heat, and the conduction efficiency of heat along the fiber is relatively low, and the space between the fibers can also play a certain heat insulation role. On this basis, the porous powder ceramic is filled in the internal space of the fiber material, and the pores of the porous powder ceramic are filled with air, so that the porous powder ceramic has a relatively low thermal conductivity, thereby further improving the heat insulation effect of the heat insulation layer. In addition, the powder ceramic itself has high high-temperature resistance and can maintain the stability of the structure at high temperature, thereby reducing the risk of performance degradation or structural damage of the heat insulation layer due to deformation caused by high temperature, and helping to improve the high-temperature resistance and heat insulation effect of the heat insulation pad as a whole.

[0050] In some embodiments, the porosity of the heat insulation layer is 80% to 99%.

[0051] By adopting the technical scheme of the embodiment, the heat insulation layer has a large porosity, so that a large number of pores are distributed in the heat insulation layer, the pores are filled with air, and when heat passes through the heat insulation layer, the conduction medium needs to be constantly converted between the solid material and the gas in the pores, so that the resistance of heat transfer is increased, and the heat insulation layer has good heat insulation effect. In addition, the maximum porosity of the heat insulation layer is not more than 99%, so that the heat insulation layer can maintain the integrity of the structure, and the solid structure part of the heat insulation layer makes the heat insulation layer itself have good strength, so that various stresses in the use process can be resisted, thereby reducing the risk of collapse or deformation damage of the structure of the heat insulation layer itself.

[0052] In some embodiments, the thermal conductivity of the thermal insulation layer at room temperature is less than 0.23 W / (m·K).

[0053] By adopting the technical scheme of this embodiment, the thermal conductivity of the thermal insulation layer at room temperature is controlled to be less than 0.23 W / (m·K), that is, a material with relatively low thermal conductivity is selected to make the thermal insulation layer, so that the thermal conductivity of the thermal insulation layer can be controlled to be less than 0.23 W / (m·K) within the above temperature range. In this way, the thermal insulation layer has relatively small thermal conductivity, large thermal resistance, and slow heat transfer speed, so that heat is difficult to pass through the thermal insulation layer, thereby slowing down heat transfer and improving the heat preservation and insulation effect of the thermal insulation layer.

[0054] In some embodiments, the thickness of the thermal insulation layer is 1 mm to 10 mm.

[0055] By adopting the technical scheme of this embodiment, the overall thickness of the thermal insulation layer is 1 mm to 10 mm, so that the thermal insulation pad has a suitable size. Within this size range, the thermal insulation pad can have sufficient heat insulation capacity to meet the heat insulation requirement, and at the same time, the thickness of the thermal insulation pad will not be too thick to affect the energy density of the battery device.

[0056] In some embodiments, the thickness of the first surface layer is 0.01 μm to 0.1 μm, and / or the thickness of the second surface layer is 0.01 μm to 0.1 μm.

[0057] By adopting the technical scheme of this embodiment, the thickness of the first surface layer (the second surface layer) is controlled within the above range, so that the first surface layer (the second surface layer) has a suitable size. Within this size range, the first surface layer (the second surface layer) can provide good protection for the thermal insulation layer, so that the thermal insulation pad can have good structural strength and structural stability, and at the same time, the thickness of the first surface layer (the second surface layer) will not be too large to cause the size of the first gap and the second gap to be too small, or to cause the thickness of the thermal insulation layer to be too small, thereby ensuring the heat insulation effect of the thermal insulation pad.

[0058] In some embodiments, the first surface layer and the second surface layer are both insulating layers.

[0059] By adopting the technical scheme of this embodiment, the first surface layer and the second surface layer are both set as insulating layers, so that the thermal insulation pad can be insulated to reduce the risk of short circuit inside the battery device, thereby ensuring the normal use of the battery device.

[0060] In some embodiments, the first surface layer is a polyimide surface layer, a polyethylene terephthalate surface layer, a polypropylene surface layer, a polycarbonate surface layer, a polyvinyl chloride surface layer, or a polyurethane surface layer.

[0061] And / or, the second surface layer is a polyimide surface layer, a polyethylene terephthalate surface layer, a polypropylene surface layer, a polycarbonate surface layer, a polyvinyl chloride surface layer, or a polyurethane surface layer.

[0062] Secondly, some other embodiments of this application also provide an electrical device, including the battery device described above.

[0063] The electrical device in this application embodiment includes the battery device described above, and therefore includes at least all the beneficial effects of the battery device described above, which will not be repeated here.

[0064] 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 above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0065] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0066] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0067] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0068] Figure 3 for Figure 2 A partial structural schematic diagram of the battery device is shown;

[0069] Figure 4 A cross-sectional view of the heat insulation pad of a battery device provided in an embodiment of this application;

[0070] Figure 5 This is a schematic diagram of the structure of the heat insulation pad of a battery device provided in an embodiment of this application;

[0071] Figure 6 A schematic diagram of the structure of the heat insulation pad of a battery device provided in another embodiment of this application;

[0072] Figure 7 for Figure 5 An exploded view of the heat insulation pad shown;

[0073] Figure 8 A schematic diagram of the structure of the heat insulation pad of a battery device provided in yet another embodiment of this application;

[0074] Figure 9 A schematic diagram of the experimental apparatus for the thermal diffusion experiment provided in the embodiments of this application;

[0075] Figure 10 The figure shows the experimental results of a thermal diffusion experiment on an experimental object;

[0076] Figure 11 The figure shows the experimental results of a thermal diffusion experiment on another experimental object;

[0077] Figure 12 The figure shows the experimental results of a thermal diffusion experiment on another experimental subject.

[0078] The following are the labeling elements in the figure:

[0079] 1. Battery; 2. Controller; 3. Motor;

[0080] 10. Battery cells;

[0081] 20. Box body; 201. Accommodation space; 21. First part; 22. Second part;

[0082] 30. Insulation pad; 31. First surface layer; 32. Second surface layer; 33. Insulation layer; 301. First gap; 302. Second gap; 34. First separator; 35. Second separator; 36. Buffer structure; 361. Buffer hole; 37. Third separator;

[0083] 40. Experimental apparatus; 41. Outer casing; 411. Explosion-proof valve; 42. Battery device to be tested; 421. First battery cell; 422. Second battery cell; 423. First heat insulation pad; 424. Second heat insulation pad; 43. Heating plate; 44. First brick layer; 45. Second brick layer; 46. First clamp; 47. Second clamp. Detailed Implementation

[0084] To make the technical problem to be solved, the technical solution and the beneficial effects of this application clearer, the following is in conjunction with the appendix. Figures 1 to 12 The embodiments described herein will be used to further illustrate this application in detail. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0085] 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.

[0086] In the description of the embodiments of the present application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0087] In this paper, the reference to "embodiments" means that the specific features, structures or properties described in conjunction with the embodiments can be included in at least some embodiments of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiments, nor is it an independent or alternative embodiment to other embodiments. The skilled in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments in any suitable manner.

[0088] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0089] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces). The meaning of "several" is one or more, unless otherwise explicitly specified.

[0090] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0091] In the description of the embodiments of the present application, unless specifically defined and limited, the terms "mounting", "connection", "connecting", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two components or interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0092] In the description of the embodiments of the present application, unless specifically defined and limited, when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on another component or indirectly on another component. When a component is referred to as "connected to" another component, it can be directly connected to another component or indirectly connected to another component.

[0093] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0094] If not specifically stated, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0095] The temperature of the battery is the most important parameter affecting the performance of the battery, and is the focus of the current battery design process.

[0096] In the related art, the battery monomer is the smallest unit of the battery, and the root cause of the overheating instability of the battery is the thermal runaway of the battery monomer inside the battery. When the internal temperature of one or more battery monomers exceeds a certain threshold, a series of uncontrollable chemical reactions will occur in the electrode assembly inside the battery monomer, and short circuit and electrolyte combustion will occur inside the battery monomer, so that the temperature of the battery monomer is getting higher and higher, and then the battery monomer may catch fire. Since the multiple battery monomers inside the battery are arranged in a matrix close to each other, if one of the battery monomers occurs thermal runaway, the heat generated by the battery monomer will quickly radiate to the surrounding and conduct to the surrounding battery monomers, so that the surrounding battery monomers are heated and the temperature continues to rise, and once heated to a temperature higher than the threshold, the surrounding battery monomers will also be triggered to occur thermal runaway. In this way, enhancing the heat isolation between the thermal runaway battery monomer and the surrounding battery monomers becomes one of the important means to prevent the spread of thermal runaway.

[0097] In the related art, a heat insulation structure is usually arranged between adjacent battery monomers, and the heat insulation structure forms a heat insulation barrier between the adjacent battery monomers, which can effectively delay heat diffusion. However, in actual use, the battery monomers will swell in the repeated charging and discharging process, and the swelling of the battery monomers is uneven. The swelling of the middle region of the battery monomers is more obvious than that of the side region. Thus, in the repeated swelling process of the battery monomers, the middle part of the heat insulation structure bears different extrusion forces from the side edges. The middle region is deformed greatly under stress, while the side edges are relatively small. With the extension of the use time, the middle part of the heat insulation structure is damaged, thereby causing the heat insulation structure to be damaged and the heat insulation effect to be poor.

[0098] Based on this, the embodiments of the present application provide a battery device, which is provided with a heat insulation pad between adjacent battery monomers. The heat insulation pad comprises a first surface layer, a second surface layer and a heat insulation layer. The heat insulation layer is arranged between the two surface layers and has a first gap with the first surface layer and a second gap with the second surface layer. Thus, when the battery monomers swell and extrude the heat insulation pad, due to the existence of the first gap and the second gap, the middle part of the heat insulation pad has a larger deformation space, and the middle part of the heat insulation pad can bear a larger extrusion force to adapt to the possible larger swelling deformation of the middle region of the battery monomers, thereby helping to reduce the risk of damage to the heat insulation pad structure caused by the large stress deformation of the middle region, prolonging the service life of the heat insulation structure and improving the heat insulation effect, thereby effectively insulating the adjacent battery monomers and making the battery device have higher thermal stability and improved use reliability.

[0099] In the embodiments of the present application, the battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging to continue to be used.

[0100] The battery monomer can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0101] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0102] For convenience of description, an electric device is provided in an embodiment of the present application, which is taken as an example of a vehicle for description.

[0103] Please refer to Figure 1 , Figure 1A schematic diagram of a vehicle is provided for some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle is internally provided with a battery apparatus 1, which can be arranged at the bottom, head or tail of the vehicle. The battery apparatus 1 can be used for power supply of the vehicle, for example, the battery apparatus 1 can be used as the operating power supply of the vehicle. The vehicle can further include a controller 2 and a motor 3, the controller 2 is used to control the battery apparatus 1 to supply power to the motor 3, for example, for the working power demand of the vehicle during starting, navigation and driving.

[0104] In some embodiments, the battery apparatus 1 can not only be used as the operating power supply of the vehicle, but also be used as the driving power supply of the vehicle, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle.

[0105] Please refer to Figure 2 The present application also provides a battery apparatus 1. The battery apparatus 1 can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells 10 connected in series, parallel or mixed connection through a busbar component.

[0106] In some embodiments, the battery apparatus 1 includes a battery management system (BMS), which is a core component responsible for monitoring and managing the state of the battery cell 10. Its main functions include: real-time monitoring of the voltage, current, temperature and other parameters of the battery cell 10, to ensure that the battery is in a safe working state; balancing the charge of each battery cell 10 in the battery cell assembly through active or passive methods, to prolong the service life of the battery; controlling and regulating the temperature of the battery cell 10 to avoid performance degradation or safety risks caused by overheating or overcooling; detecting faults of the battery cell assembly and the BMS itself, and taking appropriate protection measures such as power cut-off, alarm, etc.

[0107] As an example, the battery management system can be arranged in the box 20 to support and protect the battery management system through the box 20.

[0108] As an example, the battery management system can also be arranged outside the box 20 and connected to the battery cell 10, sensor and other devices in the box 20 through wires.

[0109] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells 10.

[0110] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells 10 into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 10 with a cable tie.

[0111] In some embodiments, the battery device 1 can be a battery pack, which includes a case 20 and one or more battery cell assemblies housed in the case 20.

[0112] As an example, the battery cell assembly can be a battery module, which can be housed in the case 20 by fixing the battery module in the case 20.

[0113] As an example, the battery cell assembly can also be housed in the case 20 by directly fixing a plurality of battery cells 10 in the case 20.

[0114] In some embodiments, the case 20 has an accommodation space 201 inside to accommodate the battery cells 10. The case 20 can be made of a material having certain hardness and strength, so that the case 20 is not easily deformed when subjected to extrusion and collision, so that the battery can have higher structural strength and reliability can also be improved. The material of the case 20 can be various, including but not limited to aluminum, stainless steel, aluminum alloy, iron or plastic, etc.

[0115] In some embodiments, the case 20 can be part of the chassis structure of the vehicle. For example, part of the case 20 can be at least part of the floor of the vehicle, or part of the case 20 can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0116] As an example, the case 20 can include a first part 21 and a second part 22, and the first part 21 and the second part 22 are combined so that the case 20 forms a closed accommodation space 201 inside to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first part 21 and the second part can be the top cover and the bottom plate of the case 20, respectively. The first part 21 and the second part 22 can also be hollow structures with one side open, and the open side of the first part 21 is combined with the open side of the second part 22.

[0117] As an example, the case 20 can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame, so that the case 20 forms a closed accommodation space 201 inside to accommodate the battery cell assembly.

[0118] In some embodiments, the battery cell 10 includes an electrode assembly and a housing, the electrode assembly is installed in the housing to protect the electrode assembly by the housing, and one or more electrode assemblies can be contained in the housing.

[0119] The electrode assembly is composed of a positive electrode tab, a negative electrode tab and a separator. The electrode assembly mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive current collector and a positive active material layer, the positive active material layer is coated on the surface of the positive current collector, the part of the positive current collector which is not coated with the positive active material layer protrudes from the part which is coated with the positive active material layer, and the part which is not coated with the positive active material layer serves as a positive electrode tab, or a metal conductor is welded on the positive current collector and led out as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer, the negative active material layer is coated on the surface of the negative current collector, the part of the negative current collector which is not coated with the negative active material layer protrudes from the part which is coated with the negative active material layer, and the part which is not coated with the negative active material layer serves as a negative electrode tab, or a metal conductor is welded on the negative current collector and led out as a negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc.

[0120] The housing of the battery cell 10 is provided with electrode terminals. The electrode terminal refers to a conductive piece provided on the housing, the electrode terminal is connected with the electrode tab of the electrode assembly to output the electric energy of the battery cell 10 or charge the battery cell 10. The battery cell 10 generally has two electrode terminals, the two electrode terminals are respectively connected with the positive and negative electrode tabs of the electrode assembly, the electrode terminal connected with the positive electrode tab is a positive electrode terminal, and the electrode terminal connected with the negative electrode tab is a negative electrode terminal.

[0121] When the battery cell 10 is charged, the electric energy is converted into chemical energy by the chemical reaction between the electrolyte and the electrode and stored in the battery cell 10, while in the discharging process, the chemical energy is converted into electric energy and released. This energy conversion process is accompanied by energy loss and heat generation, if the heat generated in the battery cell 10 cannot be effectively dissipated due to poor heat dissipation inside the battery cell 10, the battery cell 10 will overheat. In addition, there is a certain internal resistance in the battery cell 10, and the current passing through the internal resistance will generate resistance loss, causing the battery cell 10 to heat up. When the current is too large or the internal resistance is too high, the heating inside the battery cell 10 will be intensified, causing the battery cell 10 to overheat. If the maximum voltage of the battery cell 10 is exceeded during the charging process, or the voltage of the battery cell 10 is too low during the discharging process, the battery cell 10 will be overcharged or overdischarged, which will also cause the chemical reaction inside the battery cell 10 to get out of control, generating too much heat and causing the battery cell 10 to overheat.

[0122] The battery device of the present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. In the drawings, the thickness direction of the thermal insulation pad is the direction indicated by the bidirectional arrow F1 in the drawings, the length direction of the thermal insulation pad is the direction indicated by the bidirectional arrow F2 in the drawings, and the width direction of the thermal insulation pad is the direction indicated by the bidirectional arrow F3 in the drawings. Figures 2 to 11 The battery device of the present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. In the drawings, the thickness direction of the thermal insulation pad is the direction indicated by the bidirectional arrow F1 in the drawings, the length direction of the thermal insulation pad is the direction indicated by the bidirectional arrow F2 in the drawings, and the width direction of the thermal insulation pad is the direction indicated by the bidirectional arrow F3 in the drawings.

[0123] In the embodiments of the present application, as shown in the drawings, the battery device 1 comprises a plurality of battery monomers 10 and a thermal insulation pad 30; the thermal insulation pad 30 is arranged between two adjacent battery monomers 10; the thermal insulation pad 30 comprises a first surface layer 31, a second surface layer 32, and a thermal insulation layer 33 arranged between the first surface layer 31 and the second surface layer 32, and the thermal insulation layer 33 has a first gap 301 with the first surface layer 31 and a second gap 302 with the second surface layer 32. Figures 3 to 5 In the embodiments of the present application, the battery device 1 comprises a plurality of battery monomers 10, i.e. the battery device 1 comprises two or more battery monomers 10. The plurality of battery monomers 10 are arranged in a certain order, for example, the plurality of battery monomers 10 can be arranged in one direction, or arranged in two mutually perpendicular directions. The above-mentioned battery monomers can be prismatic battery monomers or cylindrical battery monomers, such as square battery monomers or hexagonal prism battery monomers, etc.

[0124] The battery device 1 further comprises a thermal insulation pad 30, wherein the thermal insulation pad 30 is a structure for insulating heat, and the thermal insulation pad 30 is located between two adjacent battery monomers 10, i.e. the thermal insulation pad 30 is arranged between the side surface of one battery monomer 10 and the side surface of another battery monomer 10. The thermal insulation pad 30 is used to spatially separate the adjacent battery monomers 10, and the thermal insulation pad 30 can delay or reduce the heat conduction between the adjacent battery monomers 10, thereby reducing the risk of mutual influence between the adjacent battery monomers 10 due to heat conduction, such as reducing the risk of overheating of one battery monomer 10 affecting the normal working state of the adjacent battery monomer 10.

[0125]

[0126] ​In the embodiment of the present application, the thermal insulation pad 30 is a multi-layer structure, which comprises a first surface layer 31, a second surface layer 32 and a thermal insulation layer 33. In a thermal insulation pad 30, the first surface layer 31 and the second surface layer 32 are the parts of the thermal insulation pad 30 that face the battery monomer 10, which can be in direct contact with the battery monomer 10, or can also be arranged at intervals with the adjacent battery monomer 10; the thermal insulation pad 30 is located between the first surface layer 31 and the second surface layer 32, which can play a role in protecting the thermal insulation layer 33; the thermal insulation layer 33 is the key part to realize the thermal insulation function, and the thermal insulation layer 33 can have a structure with thermal insulation capability, which can prevent heat transfer between adjacent battery monomers 10 to a certain extent, thereby prolonging the heat transfer time, for example, the thermal insulation layer 33 can be made of a thermal insulation material, for example, the thermal insulation material can be a single material such as glass fiber material, polycrystalline silicon material, nano-silicon material, nano-carbon fiber material, aerogel material, etc., or the thermal insulation material can also be a mixed material of multiple materials with thermal insulation function, etc.

[0127] In the embodiment of the present application, the thermal insulation pad 30 also has a first gap 301 and a second gap 302, wherein the first surface layer 31 is arranged at intervals with the thermal insulation layer 33 and forms the first gap 301 therebetween, and the second surface layer 32 is also arranged at intervals with the thermal insulation layer 33 and forms the second gap 302 therebetween. By arranging the first gap 301 and the second gap 302, on the one hand, the first gap 301 and the second gap 302 can play a buffering role, when the battery device 1 is subjected to external impact or the battery monomer 10 is deformed by swelling, the first gap 301 and the second gap 302 can effectively buffer the external force, thereby reducing the risk of damage to the thermal insulation pad 30 due to extrusion, wherein when the battery monomer 10 swells to extrude the thermal insulation pad 30, due to the existence of the first gap 301 and the second gap 302, the middle part of the thermal insulation pad 30 has a larger deformation space, and the middle part of the thermal insulation pad 30 can withstand a larger extrusion force to adapt to the possible larger swelling deformation of the middle region of the battery monomer 10; on the other hand, the first gap 301 and the second gap 302 can be filled with air, and air is a poor conductor of heat, so it can also enhance the thermal insulation effect of the thermal insulation pad 30 to a certain extent.

[0128] The battery device 1 of the embodiment of the present application is provided with a heat insulation pad 30 between adjacent battery monomers 10, the heat insulation pad 30 comprises a first surface layer 31, a second surface layer 32 and a heat insulation layer 33, the heat insulation layer 33 is arranged between the two surface layers and has a first gap 301 with the first surface layer 31 and a second gap 302 with the second surface layer 32, the first gap 301 and the second gap 302 are filled with air, air is a poor conductor of heat, by arranging the first gap and the second gap 302, the heat insulation effect of the heat insulation pad 30 can be enhanced to a certain extent, in addition, the first gap 301 and the second gap 302 can also play a buffering role, when the battery device 1 is subjected to external impact or the battery monomer 10 is deformed due to swelling, the first gap 301 and the second gap 302 can effectively buffer the external force, thereby reducing the risk of damage to the heat insulation pad 30 due to extrusion, and when the battery monomer 10 swells and extrudes the heat insulation pad 30, due to the existence of the first gap 301 and the second gap 302, the middle part of the heat insulation pad 30 has a larger deformation space, the middle part of the heat insulation pad 30 can withstand a larger extrusion force, so as to adapt to the possible larger swelling deformation of the middle part of the battery monomer 10, thereby helping to reduce the risk of damage to the heat insulation pad 30 due to the large deformation of the middle part, prolonging the service life of the heat insulation structure and improving the heat insulation effect, thereby effectively insulating the adjacent battery monomer 10, making the thermal stability of the battery device 1 higher and the use reliability improved.

[0129] In some embodiments, as shown in Figure 4 The size of the first gap 301 in the thickness direction of the heat insulation pad 30 is 0.5-1.0 μm.

[0130] It can be understood that the thickness direction of the heat insulation pad 30 is the direction indicated by the bidirectional arrow F1 in the figure, and in actual use, this direction is the same as the width direction of the gap between the adjacent two battery monomers 10.

[0131] Therefore, the size L1 of the first gap 301 in the thickness direction of the heat insulation pad 30 is set to 0.5-1.0 μm, so that the first gap 301 has a suitable size, within this size range, the heat insulation pad 30 can have sufficient deformation space to meet the use requirement of buffering the swelling of the battery monomer 10, and at the same time, the thickness of the heat insulation pad 30 will not be too thick to affect the energy density of the battery device 1.

[0132] In specific embodiments, the size of the first gap 301 in the thickness direction of the heat insulation pad 30 can be 0.5 μm, 0.6 μm, 0.7 μm, 0.75 μm, 0.8 μm, 0.85 μm, 0.9 μm, 0.95 μm or 1.0 μm, etc., and the specific size of the first gap 301 is not uniquely limited here, and can be designed as required in use.

[0133] In some embodiments, such as Figure 4 As shown, along the thickness direction of the heat insulation pad 30, the size of the second gap 302 is 0.5μm to 1.0μm.

[0134] Similar to the first gap 301, the dimension L2 of the second gap 302 along the thickness direction of the heat insulation pad 30 is set to 0.5μm to 1.0μm, so that the second gap 302 has a suitable size. Within this size range, the heat insulation pad 30 can have sufficient deformation space to meet the expansion requirements of the battery cell 10, while the thickness of the heat insulation pad 30 will not be too thick, thus affecting the energy density of the battery device 1.

[0135] In a specific embodiment, the size of the second gap 302 along the thickness direction of the heat insulation pad 30 can be 0.5μm, 0.6μm, 0.7μm, 0.75μm, 0.8μm, 0.85μm, 0.9μm, 0.95μm, or 1.0μm, etc. The specific size of the first gap 301 is not uniquely limited here, and can be designed according to the needs when using it.

[0136] It should be noted that, along the thickness direction of the heat insulation pad 30, the size of the first gap 301 can be equal to the size of the second gap 302, or the size of the first gap 301 can be different from the size of the second gap 302. Within the above-mentioned size range, the design can be carried out according to the specific usage requirements.

[0137] In some embodiments, such as Figures 4 to 7 As shown, the heat insulation pad 30 also includes a first separator 34 and a second separator 35. The first separator 34 is disposed between the first surface layer 31 and the heat insulation layer 33, and the second separator 35 is disposed between the second surface layer 32 and the heat insulation pad 30. The first surface layer 31, the first separator 34 and the heat insulation layer 33 form a first gap 301, and the second surface layer 32, the second separator 35 and the heat insulation pad 30 form a second gap 302.

[0138] In this embodiment, a first separator 34 is provided between the first surface layer 31 and the heat insulation pad 30, and the space between the first surface layer 31, the first separator 34 and the heat insulation pad 30 is the first gap 301. At the same time, a second separator 35 is provided between the second surface layer 32 and the heat insulation pad 30, and the space between the second surface layer 32, the second separator 35 and the heat insulation pad 30 is the second gap 302. Thus, the overall structure of the heat insulation pad 30 is simple and easy to mold and manufacture.

[0139] In some embodiments, the thermal insulation pad 30 comprises a plurality of first partitions 34, and at least two opposite sides of the thermal insulation pad 30 are respectively provided with at least one first partition 34 along a direction perpendicular to the thickness direction of the thermal insulation pad 30.

[0140] In some embodiments, the thermal insulation pad 30 comprises a plurality of first partitions 34, and at least two opposite sides of the thermal insulation pad 30 are respectively provided with at least one first partition 34 along a direction perpendicular to the thickness direction of the thermal insulation pad 30.

[0141] In some embodiments, the thermal insulation pad 30 comprises a plurality of first partitions 34, and at least two opposite sides of the thermal insulation pad 30 are respectively provided with at least one first partition 34 along a direction perpendicular to the thickness direction of the thermal insulation pad 30.

[0142] In some embodiments, the thermal insulation pad 30 comprises a plurality of first partitions 34, and at least two opposite sides of the thermal insulation pad 30 are respectively provided with at least one first partition 34 along a direction perpendicular to the thickness direction of the thermal insulation pad 30. Figures 4 to 7

[0143] ​At least two opposite sides of the thermal insulation pad 30 are respectively provided with at least one second partition 35 in the direction perpendicular to the thickness direction of the thermal insulation pad 30. The number of the second partitions 35 can be two or more, and at least one of the two or more second partitions 35 is arranged on one side of the thermal insulation pad 30 and the other is arranged on the opposite side. For example, the number of the second partitions 35 is two, one of which is arranged on one side of the thermal insulation pad 30 in the length direction, and the other is arranged on the opposite side of the thermal insulation pad 30 in the length direction; or the number of the second partitions 35 is four, two of which are arranged on the opposite sides of the thermal insulation pad 30 in the length direction, and the other two are arranged on the opposite sides of the thermal insulation pad 30 in the width direction; or the second partition 35 can also be a ring-shaped member, which is arranged around the side of the thermal insulation pad 30 so that the side of the thermal insulation pad 30 is provided with the second partition 35.

[0144] In the embodiment, the second partition 35 is arranged on at least two opposite sides of the thermal insulation pad 30, that is, the second partition 35 is arranged between the second surface layer 32 and the thermal insulation layer 33 on at least two opposite sides of the thermal insulation pad 30, the second partition 35 lifts the second surface layer 32 and makes it not adhere to the thermal insulation layer 33, thereby forming a second gap 302 between the second surface layer 32 and the thermal insulation layer 33. The size of the second gap 302 can be determined by designing the size of the second partition 35 in the thickness direction of the thermal insulation pad 30, that is, the thickness of the second partition 35. The second gap 302 is simple to form, and the thermal insulation pad 30 is easy to process and mass-produce.

[0145] In some embodiments, the side edges of the first surface layer 31 and the side edges of the second surface layer 32 are sealingly connected to seal the first gap 301 and the second gap 302.

[0146] In this way, the first surface layer 31 and the second surface layer 32 are sealingly connected at the circumferential side positions, the first surface layer 31 and the second surface layer 32 form a box-shaped structure, and the thermal insulation layer 33 is encapsulated in the box-shaped structure formed by the first surface layer 31 and the second surface layer 32, so that the first surface layer 31 and the second surface layer 32 can well protect the thermal insulation layer 33, and at the same time, a certain amount of static air can be encapsulated in the first gap 301 and the second gap 302 to improve the overall thermal insulation effect of the thermal insulation pad 30.

[0147] The side edges of the first surface layer 31 and the side edges of the second surface layer 32 are sealingly connected, for example, a sealing glue can be applied between the first surface layer 31 and the second surface layer 32 for sealing, or a heat sealing form can be used for sealing, or a sealing structure such as a sealing ring can be arranged on the side edges of the first surface layer 31 and the side edges of the second surface layer 32 for sealing, etc.

[0148] In some embodiments, the first partition 34 is annular, and the first partition 34 is arranged around the side of the thermal insulation pad 30, and the first partition 34 is sealingly connected with the first surface layer 31 and the thermal insulation layer 33 to seal the first gap 301.

[0149] In this way, the second partition 35 is arranged as an annular, and the first partition 34 is arranged around the side of the thermal insulation pad 30, and the first partition 34 is sealingly connected with the first surface layer 31 and the thermal insulation pad 30 to seal the first gap 301. In this way, the first partition 34 cooperates with the first surface layer 31 to protect the thermal insulation layer 33, and the first gap 301 is sealed, so that a certain amount of static air can be encapsulated in the first gap 301, thereby improving the overall thermal insulation effect of the thermal insulation pad 30.

[0150] Understandably, the first partition 34 is sealingly connected with the first surface layer 31 and the thermal insulation layer 33, for example, a sealing glue can be applied between the first surface layer 31 and the thermal insulation pad 30 to seal the first partition 34, or a heat sealing form can be used for sealing, or a sealing structure such as a sealing ring can be arranged on the side of the first surface layer 31 and the side of the thermal insulation layer 33 to clamp the first surface layer 31, the first partition 34 and the thermal insulation layer 33 to achieve sealing, etc.

[0151] In some embodiments, the second partition 35 is annular, and the second partition 35 is arranged around the side of the thermal insulation pad 30, and the second partition 35 is sealingly connected with the second surface layer 32 and the thermal insulation layer 33 to seal the second gap 302.

[0152] In this way, the second partition 35 is arranged as an annular, and the first partition 34 is arranged around the side of the thermal insulation pad 30, and the first partition 34 is sealingly connected with the first surface layer 31 and the thermal insulation pad 30 to seal the first gap 301. In this way, the first partition 34 cooperates with the first surface layer 31 to protect the thermal insulation layer 33, and the first gap 301 is sealed, so that a certain amount of static air can be encapsulated in the first gap 301, thereby improving the overall thermal insulation effect of the thermal insulation pad 30.

[0153] Understandably, the second partition 35 is sealingly connected with the second surface layer 32 and the thermal insulation layer 33, for example, a sealing glue can be applied between the second surface layer 32 and the thermal insulation pad 30 to seal the second partition 35, or a heat sealing form can be used for sealing, or a sealing structure such as a sealing ring can be arranged on the side of the second surface layer 32 and the side of the thermal insulation layer 33 to clamp the second surface layer 32, the second partition 35 and the thermal insulation layer 33 to achieve sealing, etc.

[0154] In some embodiments, as shown in FIG. 6, the first partition 34 and the second partition 35 are annular, and the first partition 34 and the second partition 35 are arranged around the side of the thermal insulation pad 30, and the first partition 34 and the second partition 35 are sealingly connected with the first surface layer 31 and the second surface layer 32 and the thermal insulation layer 33 to seal the first gap 301 and the second gap 302. Figures 4 to 7As shown, the first partition piece 34 is an elastic piece. In this way, the first partition piece 34 is arranged as an elastic piece, and the first partition piece 34 has a certain deformation capacity, so as to also be able to buffer the force borne by the thermal insulation pad 30, which is conducive to improving the buffering effect of the thermal insulation pad 30 on the force and improving the anti-deformation capacity of the thermal insulation pad 30.

[0155] In some embodiments, as shown in Figures 4 to 7 As shown, the second partition piece 35 is an elastic piece. In this way, the second partition piece 35 is arranged as an elastic piece, and the second partition piece 35 has a certain deformation capacity, so as to also be able to buffer the force borne by the thermal insulation pad 30, which is conducive to improving the buffering effect of the thermal insulation pad 30 on the force and improving the anti-deformation capacity of the thermal insulation pad 30.

[0156] In some embodiments, along the thickness direction of the thermal insulation pad 30, the thickness of the first partition piece 34 is 0.5 μm to 1.2 μm.

[0157] In this way, the thickness of the first partition piece 34 is designed within the above thickness range, so that the size of the first gap 301 can fall within the size interval of 0.5 μm to 1.0 μm, meeting the size forming requirement of the first gap 301.

[0158] In specific embodiments, the size of the first partition piece 34 along the thickness direction of the thermal insulation pad 30 can be 0.5 μm, 0.6 μm, 0.7 μm, 0.75 μm, 0.8 μm, 0.85 μm, 0.9 μm, 0.95 μm, 1.0 μm, 1.1 μm, or 1.2 μm, etc. Here, the specific thickness size of the first partition piece 34 is not uniquely limited, and it can be designed according to the size requirement of the first gap 301.

[0159] In some embodiments, as shown in Figure 4 and Figure 7 As shown, along the thickness direction of the thermal insulation pad 30, the thickness of the second partition piece 35 is 0.5 μm to 1.2 μm.

[0160] In this way, the thickness of the second partition piece 35 is designed within the above thickness range, so that the size of the second gap 302 can fall within the size interval of 0.5 μm to 1.0 μm, meeting the size forming requirement of the second gap 302.

[0161] In this way, the thickness of the second partition piece 35 is designed within the above thickness range, so that the size of the second gap 302 can fall within the size interval of 0.5 μm to 1.0 μm, meeting the size forming requirement of the first gap 301.

[0162] In a specific embodiment, the dimensions of the second separator 35 along the thickness direction of the heat insulation pad 30 can be 0.5μm, 0.6μm, 0.7μm, 0.75μm, 0.8μm, 0.85μm, 0.9μm, 0.95μm, 1.0μm, 1.1μm, or 1.2μm, etc. The specific thickness dimension of the first separator 34 is not uniquely limited here; it can be designed according to the size requirements of the first gap 301.

[0163] It should be noted that, in specific embodiments, along the thickness direction of the heat insulation pad 30, the thickness of the first separator 34 can be the same as the thickness of the second separator 35, or the thickness of the first separator 34 can be different from the thickness of the second separator 35. Within the above-mentioned size range, the design can be carried out according to the specific usage requirements.

[0164] In other embodiments, such as Figure 8 As shown, unlike the embodiments described above, the heat insulation pad 30 includes a third separator 37. The third separator 37 is provided on at least two opposite sides of the first surface layer 31 and the second surface layer 32 in a direction perpendicular to the thickness direction of the heat insulation pad 30. The opposite sides of the heat insulation layer 33 are connected to the corresponding third separator 37. The first surface layer 31, a part of the third separator 37 and the heat insulation layer 33 form a first gap 301, and the second surface layer 32, another part of the third separator 37 and the heat insulation layer 33 form a second gap 302.

[0165] In this embodiment, a third partition 37 is sandwiched between the first surface layer 31 and the second surface layer 32, forming a large gap space between the first surface layer 31, the second surface layer 32 and the third partition 37. On this basis, the side of the heat insulation layer 33 is connected to the middle of the third partition 37, that is, the heat insulation layer 33 is connected to the middle of the third partition 37, thereby dividing the above-mentioned gap space into a first gap 301 and a second gap 302.

[0166] It can be understood that the provision of third separators 37 on at least two opposite sides of the first surface layer 31 and the second surface layer 32 means that the number of third separators 37 can be two or more, with at least one of the two or more third separators 37 disposed on one side of the heat insulation pad 30 and the other disposed on the opposite side. For example, the number of third separators 37 is two, with one third separator 37 disposed on one side of the heat insulation pad 30 along its length, and the other third separator 37 disposed on the opposite side of the heat insulation pad 30 along its length. Figure 8The third partition 37 can be arranged in the length direction of the heat insulation pad 30, and the number of the third partition 37 can be 2, 4, or more. As shown in FIG. 1, the number of the third partition 37 can be 2, and the two third partitions 37 are arranged on the opposite sides of the heat insulation pad 30 in the length direction. As shown in FIG. 2, the number of the third partition 37 can be 4, and two third partitions 37 are arranged on the opposite sides of the heat insulation pad 30 in the length direction, and the other two third partitions 37 are arranged on the opposite sides of the heat insulation pad 30 in the width direction. As shown in FIG. 3, the third partition 37 can be an annular member, and the third partition 37 is arranged around the side of the heat insulation pad 30, so that the side of the heat insulation pad 30 is provided with the third partition 37.

[0167] In some embodiments, as shown in FIG. 1, the middle part of the heat insulation layer 33 is provided with a buffer structure 36, which is arranged between the first gap 301 and the second gap 302. Figures 5 to 8

[0168] The buffer structure 36 can be an elastic structure formed by arranging a structure of different materials in the middle part of the heat insulation layer 33. The elastic material has a greater elastic deformation capacity than the side area of the heat insulation layer 33. Alternatively, the buffer structure 36 can be formed by thinning or perforating the structure in the middle part of the heat insulation layer 33.

[0169] In the present embodiment, the buffer structure 36 is arranged in the middle part of the heat insulation layer 33, and the buffer structure 36 is located in the middle part of the heat insulation pad 30. Since the middle part of the heat insulation pad 30 generally corresponds to the position of the battery monomer 10, the arrangement of the buffer structure 36 can further improve the ability of the middle part of the heat insulation pad 30 to resist the extrusion force generated by the swelling and deformation of the battery monomer 10. Therefore, the middle part of the heat insulation pad 30 can withstand greater extrusion force to adapt to the possible greater swelling and deformation of the middle area of the battery monomer 10. Thus, the risk of damage to the structure of the heat insulation pad 30 due to the large deformation of the middle area under stress is reduced, the service life of the heat insulation structure is further prolonged, and the heat insulation effect is further improved.

[0170] In some embodiments, as shown in FIG. 1, the buffer structure 36 includes a buffer hole 361, and the buffer hole 361 communicates the first gap 301 and the second gap 302. Figures 5 to 8

[0171] In the present embodiment, the buffer hole 361 is arranged in the middle part of the heat insulation layer 33 to form the buffer structure 36. When the heat insulation pad 30 is extruded, the buffer hole 361 can be deformed in time to buffer the extrusion force. At the same time, the buffer hole 361 communicates the first gap 301 and the second gap 302, so that air and other substances can flow between the first gap 301 and the second gap 302. When the heat insulation pad 30 is extruded on one side, the buffer hole 361 can provide a flow channel for air and other media in the first gap 301 and the second gap 302. The flow and redistribution of air can absorb part of the impact energy, thereby enhancing the overall buffering capacity of the buffer structure 36.

[0172] ​​In some embodiments, as shown in FIG. 3B, the number of the buffer holes 361 is multiple, and the multiple buffer holes 361 are uniformly arranged in the middle part of the heat insulation layer 33. In this way, the multiple buffer holes 361 are uniformly arranged in the middle part of the heat insulation pad 30, so as to ensure that the buffer structure 36 has effective buffering capacity. Figures 5 to 8

[0173] In some embodiments, the diameter of the buffer hole 361 is 0.01mm-1mm.

[0174] In this way, the diameter of the buffer hole 361 is set in the above-mentioned range, on the one hand, the overall diameter of the buffer hole 361 is relatively small, so that the air flow speed in the first gap 301 and the second gap 302 is relatively slow, and the heat convection speed is slow, thereby helping to control the conduction speed of heat through the buffer hole 361, and being conducive to improving the overall heat insulation effect of the heat insulation pad 30; on the other hand, the buffer hole 361 with small size can also ensure that it has sufficient deformation capacity to resist external force.

[0175] In specific embodiments, the diameter of the buffer hole 361 can be 0.01mm, 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc. Here, the specific size of the diameter of the buffer hole 361 is not uniquely limited, and it can be designed according to requirements.

[0176] In some embodiments, the sum of the cross-sectional areas of the buffer holes 361 is less than or equal to one-tenth of the surface area of the heat insulation layer 33.

[0177] That is, the sum of the cross-sectional areas of the buffer holes 361 does not exceed one-tenth of the total surface area of the heat insulation layer 33, which ensures that the buffer holes 361 have sufficient buffering function, and at the same time, the sum of the areas of the cross sections of the buffer holes 361 is controlled within a certain range, so as to ensure that the heat insulation layer 33 can still effectively block the transmission of most heat, and ensure that the heat insulation pad 30 has stable heat insulation performance.

[0178] In some embodiments, the cross-sectional area of the buffer hole 361 refers to the area of the cross section of the buffer hole 361 perpendicular to the thickness direction of the heat insulation pad 30, and the surface area of the heat insulation layer 33 refers to the area of the surface of the heat insulation layer 33 perpendicular to the thickness direction of the heat insulation pad 30.

[0179] In some embodiments, the buffer structure 36 includes a thinned region, and the thickness of the thinned region is less than the thickness of other positions of the heat insulation layer 33.

[0180] ​In the embodiment, different from the above-mentioned embodiments, the buffer structure 36 is a thinned region provided at the middle part of the thermal insulation layer 33, and the thickness of the thinned region is smaller than the thickness of other positions of the thermal insulation layer 33, that is, the thinned region forms a relatively weak region in structure, and the thickness of the thinned region is smaller than other parts of the thermal insulation layer 33, so that the thinned region is more likely to deform when subjected to external pressure or impact, thereby enabling the middle part of the thermal insulation layer 33 to have better buffering effect.

[0181] In some embodiments, the thermal insulation layer 33 is a composite layer of a fiber material and a porous powder ceramic.

[0182] The fiber material generally has good flexibility and tensile strength, and can enhance the overall mechanical properties of the thermal insulation layer 33 to a certain extent. In addition, the interwoven structure of the fiber material can effectively block the conduction of heat, and the conduction efficiency of heat along the fiber is relatively low, and the gap between the fibers can also play a certain heat insulation effect. On this basis, the porous powder ceramic is filled in the internal gap of the fiber material, and the pores of the porous powder ceramic are filled with air, so that it has a lower thermal conductivity, thereby further improving the heat insulation effect of the thermal insulation layer 33. In addition, the powder ceramic itself has high high-temperature resistance and can maintain the stability of the structure at high temperature, thereby reducing the risk of performance degradation or structural damage of the thermal insulation layer 33 due to deformation caused by high temperature, and helping to improve the high-temperature resistance and heat insulation effect of the thermal insulation pad 30 as a whole.

[0183] In specific embodiments, the fiber material can be any one or a combination of a plurality of pre-oxidized fiber felt, ceramic fiber felt, glass fiber felt, high-silicon fiber felt, basalt fiber felt, carbon fiber felt, spandex fiber felt, polyethylene terephthalate (PET) fiber felt, polyester fiber felt, nylon fiber felt, or other fiber felt with flame-retardant function. The porous powder ceramic can be any one or a combination of a plurality of silicon dioxide, zirconium oxide, aluminum oxide, and the like.

[0184] In some embodiments, the porosity of the thermal insulation layer 33 is 80% to 99%.

[0185] The porosity of the thermal insulation layer 33 refers to the percentage of the volume of the internal pores of the thermal insulation layer 33 in the total volume of the thermal insulation layer 33. For the thermal insulation layer 33, the porosity is 80% to 99%, which indicates that most of the space inside the thermal insulation layer 33 is a pore, i.e., the thermal insulation layer 33 has a large porosity, so that the thermal insulation layer 33 is distributed with more pores, the internal pores are filled with air, and when heat passes through the thermal insulation layer 33, the heat needs to constantly convert the conduction medium between the solid material and the gas in the pores, so that the resistance of heat transfer is increased, and the thermal insulation layer 33 has a good thermal insulation effect. In addition, the maximum porosity of the thermal insulation layer 33 is not more than 99%, so that the thermal insulation layer 33 can maintain the integrity of the structure, and the solid structure part in the thermal insulation layer 33 makes the thermal insulation layer 33 itself have good strength, so that it can resist various stresses during use, thereby reducing the risk of collapse or deformation damage of the structure of the thermal insulation layer 33 itself.

[0186] In specific embodiments, the porosity of the thermal insulation layer 33 can be 80%, 82%, 85%, 88%, 90%, 92%, 95%, 98%, or 99%, etc., which is not uniquely limited here, and can be selected according to specific use requirements during design.

[0187] In some embodiments, the thermal conductivity of the thermal insulation layer 33 at room temperature is less than 0.23 W / (m·K)

[0188] In this embodiment, it should be noted that the thermal conductivity of the thermal insulation layer 33 is a physical quantity used to measure the heat conduction capacity of the thermal insulation layer 33, and the thermal conductivity of the thermal insulation layer 33 is different due to different materials used by the thermal insulation layer 33. Generally, the smaller the thermal conductivity of the thermal insulation layer 33, the slower the heat transfer speed of the thermal insulation layer 33, and the greater the thermal resistance, which means that heat can pass through the thermal insulation layer 33 more slowly, so that it can better maintain the temperature. Therefore, in the case of needing to keep warm or needing to reduce the heat conduction speed in the material, it is necessary to use a material with small thermal conductivity to make the thermal insulation layer 33, so that heat is difficult to pass through the thermal insulation layer 33, thereby slowing down heat transfer and improving the heat preservation effect.

[0189] The unit of thermal conductivity is usually watts per meter per kelvin (W / m·K). The thermal conductivity of the thermal insulation layer 33 can be determined by experiment, and for example, it can be determined by a steady-state hot plate method (such as ASTM D5470) or a transient plane heat source method (such as ISO 22007-2).

[0190] In the embodiment, the thermal conductivity of the thermal insulation layer 33 is controlled to be less than 0.23 W / (m·K) at normal temperature, i.e., at a temperature in the range of 15°C to 30°C, and the thermal insulation layer 33 is made of a material with relatively low thermal conductivity, so that the thermal conductivity of the thermal insulation layer 33 can be controlled to be less than 0.23 W / (m·K) at the temperature range. In this way, the thermal insulation layer 33 has relatively low thermal conductivity, large thermal resistance, and slow heat transfer rate, so that it is difficult for heat to pass through the thermal insulation layer 33, thereby slowing down heat transfer and improving the heat preservation and insulation effect of the thermal insulation layer 33.

[0191] In specific embodiments, the thermal conductivity of the thermal insulation layer 33 at normal temperature can be 0.05 (W / m·K), 0.08 (W / m·K), 0.1 (W / m·K), 0.12 (W / m·K), 0.15 (W / m·K), 0.18 (W / m·K), 0.2 (W / m·K), 0.22 (W / m·K), or 0.23 (W / m·K), etc. The embodiment does not limit the value of the thermal conductivity of the thermal insulation layer 33, and the value can be selected as needed during design.

[0192] In some embodiments, as shown in Figure 4 and Figure 8 , the thickness of the thermal insulation layer 33 is 1 mm to 10 mm.

[0193] In this way, the overall thickness of the thermal insulation layer 33 is 1 mm to 10 mm, so that the thermal insulation pad 30 has a suitable size. In this size range, the thermal insulation pad 30 has sufficient thermal insulation capacity to meet the thermal insulation requirement, and the thickness of the thermal insulation pad 30 does not affect the energy density of the battery device 1.

[0194] In specific embodiments, the thickness of the thermal insulation layer 33 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, etc. The specific size of the thickness of the thermal insulation layer 33 is not limited herein, and the thickness can be designed as needed during design.

[0195] In some embodiments, as shown in Figure 4 and Figure 8 , the thickness of the first surface layer 31 is 0.01 μm to 0.1 μm.

[0196] By controlling the thickness of the first surface layer 31 within the aforementioned range, the first surface layer 31 can have a suitable size. Within this size range, the first surface layer 31 can provide good protection for the heat insulation layer 33, so that the heat insulation pad 30 can have good structural strength and structural stability. At the same time, the thickness of the first surface layer 31 is not too large, which would result in the size of the first gap 301 and the second gap 302 being too small, or the thickness of the heat insulation layer 33 being too small, thereby ensuring the heat insulation effect of the heat insulation pad 30.

[0197] In a specific embodiment, the thickness of the first surface layer 31 can be 0.01μm, 0.02μm, 0.03μm, 0.04μm, 0.05μm, 0.06μm, 0.07μm, 0.08μm, 0.09μm, or 0.1μm, etc. The specific dimensions of the thickness of the first surface layer 31 are not uniquely limited here, and can be designed according to the requirements.

[0198] In some embodiments, such as Figure 4 and Figure 8 As shown, the thickness of the second layer 32 is 0.01μm to 0.1μm.

[0199] By controlling the thickness of the second surface layer 32 within the aforementioned range, the second surface layer 32 can have a suitable size. Within this size range, the second surface layer 32 can provide good protection for the heat insulation layer 33, so that the heat insulation pad 30 can have good structural strength and structural stability. At the same time, the thickness of the second surface layer 32 will not be too large, which would result in the size of the first gap 301 and the second gap 302 being too small, or the thickness of the heat insulation layer 33 being too small, thereby ensuring the heat insulation effect of the heat insulation pad 30.

[0200] In a specific embodiment, the thickness of the second surface layer 32 can be 0.01μm, 0.02μm, 0.03μm, 0.04μm, 0.05μm, 0.06μm, 0.07μm, 0.08μm, 0.09μm, or 0.1μm, etc. The specific dimensions of the thickness of the second surface layer 32 are not uniquely limited here, and can be designed according to the requirements.

[0201] Understandably, in specific embodiments, within the aforementioned thickness range, the thickness of the first surface layer 31 may be equal to the thickness of the second surface layer 32, or the thickness of the first surface layer 31 may not be equal to the thickness of the second surface layer 32.

[0202] In some embodiments, both the first surface layer 31 and the second surface layer 32 are insulating layers.

[0203] Therefore, the first surface layer 31 and the second surface layer 32 are both provided as insulation layers, so that the thermal insulation pad 30 can be insulated to reduce the risk of short circuit inside the battery device 1, thereby ensuring the normal use of the battery device 1.

[0204] In some embodiments, the first surface layer 31 is a polyimide surface layer, a polyethylene terephthalate surface layer, a polypropylene surface layer, a polycarbonate surface layer, a polyvinyl chloride surface layer, or a polyurethane surface layer.

[0205] In some embodiments, the second surface layer 32 is a polyimide surface layer, a polyethylene terephthalate surface layer, a polypropylene surface layer, a polycarbonate surface layer, a polyvinyl chloride surface layer, or a polyurethane surface layer.

[0206] It can be understood that, in specific embodiments, the material of the first surface layer 31 can be the same as the material of the second surface layer 32, or the material of the first surface layer 31 can be different from the material of the second surface layer 32.

[0207] Another embodiment of the present application also provides a battery device, which includes the battery device provided by any of the above embodiments.

[0208] The battery device of the present application has at least all the advantages of the above battery device 1, and thus will not be described here.

[0209] Please refer to Figures 2 to 4 and Figure 5 and Figure 7 , the following will provide three specific battery devices 1 in combination with specific embodiments:

[0210] Embodiment one:

[0211] The present embodiment provides a battery device 1, which includes a plurality of battery monomers 10 and a thermal insulation pad 30, the thermal insulation pad 30 is arranged between two adjacent battery monomers 10, the battery monomer 10 is a ternary six-system lithium battery, and the capacity of the battery device 1 is 143.2 Ah.

[0212] Among them, the thermal insulation pad 30 includes a first surface layer 31, a second surface layer 32, a thermal insulation layer 33, a first partition 34 and a second partition 35, the first partition 34 and the second partition 35 are both annular parts, the first partition 34 is arranged between the first surface layer 31 and the thermal insulation layer 33, the first surface layer 31, the first partition 34 and the thermal insulation layer 33 form a first gap 301, the second partition 35 is arranged between the second surface layer 32 and the thermal insulation layer 33, and the second surface layer 32, the second partition 35 and the thermal insulation layer 33 form a second gap 302.

[0213] The first surface layer 31 and the second surface layer 32 are both polyurethane layers, the thickness of the first surface layer 31 and the second surface layer 32 is 0.1 μm, the first partition 34 and the second partition 35 are both silica gel pieces and the thickness of the first partition 34 and the second partition 35 is 0.5 μm, and the size of the first gap 301 and the second gap 302 is 0.5 μm. The thermal insulation layer 33 is a composite layer of silica ceramic fiber felt and silica, the thickness of the thermal insulation layer 33 is 2.7 mm, the porosity of the thermal insulation layer 33 is 87.4%, and the thermal conductivity of the thermal insulation layer 33 at room temperature is 0.03 W / (m·K). Meanwhile, three rows of buffer holes 361 with a diameter of 1 mm are uniformly and spacedly arranged in the middle of the thermal insulation layer 33, and the number of each row of buffer holes 361 is 3, i.e. 9 buffer holes 361 are uniformly and spacedly arranged in the middle of the thermal insulation layer 33.

[0214] Example Two

[0215] The present embodiment provides another battery device 1, which comprises a plurality of battery monomers 10 and a thermal insulation pad 30 arranged between two adjacent battery monomers 10.

[0216] Different from the above-mentioned example one, in the present embodiment, the battery monomer 10 is a ternary quinary lithium battery, and the capacity of the battery device 1 is 239 Ah.

[0217] Example Three

[0218] The present embodiment provides another battery device 1, which comprises a plurality of battery monomers 10 and a thermal insulation pad 30 arranged between two adjacent battery monomers 10.

[0219] Different from the above-mentioned example two, in the present embodiment, the thickness of the thermal insulation layer 33 is 3.7 mm.

[0220] Finally, in combination with the above Figures 9 to 12 , the present embodiment provides the following heat diffusion test experiment to perform heat diffusion experiments on the battery devices provided in the above-mentioned example one, example two and example three, so as to illustrate the heat stability of the corresponding battery devices and the heat diffusion protection effect of the thermal insulation pad inside the battery device.

[0221] In the present embodiment, the specific experimental device 40 is substantially as shown in Figure 9As shown, the experimental device 40 includes an outer box 41 made of stainless steel, and a battery device to be tested 42, a heating plate 43, a first brick layer 44, a second brick layer 45, and a first clamp 46 and a second clamp 47 arranged in the outer box 41. The battery device to be tested 42 has a 10mm exhaust space between the top of the battery device to be tested 42 and the top cover of the outer box 41, and the outer box 41 is further provided with an explosion-proof valve 411. Specifically, the first brick layer 44 and the second brick layer 45 are arranged at opposite sides of the outer box 41 and abut the inner side walls of the corresponding outer box 41, and the first clamp 46 and the second clamp 47 are arranged in the first brick layer 44 and the second brick layer 45. The first clamp 46 and the second clamp 47 cooperate to clamp the battery device to be tested 42. The battery device to be tested 42 includes a first cell 421, a second cell 422, a first thermal insulation pad 423, and a second thermal insulation pad 424. The first thermal insulation pad 423 is clamped between the first cell 421 and the second cell 422, and the second thermal insulation pad 424 is clamped between the second cell 422 and the second clamp 47. The first brick layer 44 and the second brick layer 45 cooperate to clamp the first clamp 46 and the second clamp 47. The heating plate 43 is clamped between the first clamp 46 and the first cell 421. The heating plate 43 is used to heat the first cell 421, i.e., in this experiment, the first cell 421 is a heat source cell, i.e., a trigger cell that triggers thermal runaway. The second cell 422 is a heated cell, i.e., an adjacent cell adjacent to the trigger cell, to test the effect of the first cell 421 when it experiences thermal runaway on the second cell 422 adjacent to it.

[0222] A temperature sensing wire is arranged between the first cell 421 and the thermal insulation pad 30, and a first temperature sampling point S1 is arranged. A temperature sensing wire is arranged between the thermal insulation pad 30 and the second cell 422, and a second temperature sampling point S2 is arranged. A temperature sensing wire is arranged between the second thermal insulation pad 424 and the second battery monomer 10, and a third temperature sampling point S3 is arranged. Each temperature sampling point is led out of the outer box 41 through a temperature sensing wire.

[0223] The experimental device 40 described above is placed at room temperature (about 20-25℃) for experiments. The temperature sensing wires corresponding to each temperature sampling point are connected to a multi-channel temperature meter to monitor the temperature at each position in real time. The heating plate 43 is used to heat the first cell 421 at a heating intensity of 1000W. The heating plate 43 stops heating immediately after the first cell 421 experiences thermal runaway. The temperature at each temperature sampling point is monitored for more than 2 hours to evaluate the thermal diffusion protection performance.

[0224] The experimental results are as follows Figures 10 to 12and shown in Table 1. The part of the battery device 1 provided by the above-mentioned example one, example two and example three (including two adjacent battery monomers, and the heat insulation pad arranged between the two battery monomers, and the other heat insulation pad arranged on the side of one battery monomer, wherein the two adjacent battery monomers are one trigger cell and the other adjacent cell) is taken as the experimental object (i.e. the battery device to be tested in the experimental device) for experiment, Figures 9 to 11 The experimental results shown correspond to example one to example three, respectively.

[0225] It should be noted that, as shown in Figure 9 and shown in Table 1, the side of the first cell 421 close to the first heat insulation pad 423 is the cold side of the trigger cell, the side of the second cell 422 close to the first heat insulation pad 423 is the hot side of the adjacent cell, the side of the second cell 422 close to the second heat insulation pad 424 is the cold side of the adjacent cell, the highest temperature of the cold side of the trigger cell is obtained by sampling point S1, the highest temperature before the thermal runaway of the hot side of the adjacent cell is obtained by sampling point S2, and the highest temperature after the thermal runaway of the hot side of the adjacent cell is obtained by sampling point S3. It should be further noted that, in Table 1, the heat diffusion time refers to the time required for the temperature of the adjacent battery monomer 10 to rise to the temperature that triggers the thermal runaway, wherein the temperature that triggers the thermal runaway is the “highest temperature before the thermal runaway of the hot side of the adjacent cell” in the table.

[0226] Table 1

[0227]

[0228] According to the experimental results, when the thickness of the heat insulation layer of the heat insulation pad is 2.7 mm, for the ternary six-system battery device with a capacity of 143.2 Ah, i.e. the battery device provided by example one, the time for triggering the thermal runaway of the adjacent battery monomer (i.e. the adjacent cell) after the thermal runaway of one battery monomer (i.e. the trigger cell) is 11.2 min, i.e. the heat diffusion time is 11.2 min; and when the thickness of the heat insulation layer is also 2.7 mm, for the ternary five-system battery device with a capacity of 239 Ah, i.e. the battery device provided by example two, the time for triggering the thermal runaway of the adjacent battery monomer (i.e. the adjacent cell) after the thermal runaway of one battery monomer (i.e. the trigger cell) is 8.9 min, i.e. the heat diffusion time is 8.9 min. It can be known that, in the two battery devices with different capacities and different types provided by example one and example two, the same heat insulation pad can effectively delay the heat diffusion, and the heat insulation pad shows good heat insulation capacity.

[0229] In addition, for the ternary five-system battery device with a capacity of 239 Ah, when the thickness of the heat insulation layer in the heat insulation pad between the two adjacent battery monomers is 2.7 mm, i.e., the battery device provided in Example Two, the time for triggering the thermal runaway of the adjacent battery monomer (i.e., the adjacent cell) after the thermal runaway of one battery monomer (i.e., the trigger cell) is 8.9 min, i.e., the time for thermal diffusion is 8.9 min; correspondingly, when the thickness of the heat insulation layer in the heat insulation pad between the two adjacent battery monomers is 3.7 mm, i.e., the battery device provided in Example Three, the time for triggering the thermal runaway of the adjacent battery monomer (i.e., the adjacent cell) is 50.3 min, i.e., the time for thermal diffusion is 50.3 min. Therefore, the heat insulation pad with different thicknesses of the heat insulation layer has a certain heat insulation effect, and the heat insulation capacity is obviously increased with the increase of the thickness of the heat insulation layer.

[0230] The above description of each of the embodiments tends to emphasize the differences between the embodiments, and the same or similar parts can be referred to each other, and will not be described herein for the sake of brevity.

[0231] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present 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 by, The application relates to a battery thermal insulation pad. The battery thermal insulation pad comprises a plurality of battery cells, a thermal insulation pad arranged between two adjacent battery cells, and a first surface layer, a second surface layer, and a thermal insulation layer arranged between the first surface layer and the second surface layer. The first gap between the thermal insulation layer and the first surface layer and the second gap between the thermal insulation layer and the second surface layer are 0.5-1.0 microns in size along the thickness direction of the thermal insulation pad. The thermal insulation pad further comprises a first partition and a second partition, the first partition is arranged between the first surface layer and the thermal insulation layer, the second partition is arranged between the second surface layer and the thermal insulation layer, the first surface layer, the first partition, and the thermal insulation layer form the first gap, and the second surface layer, the second partition, and the thermal insulation layer form the second gap.

2. The battery device of claim 1, wherein: The thermal insulation pad comprises a plurality of first partitions, and at least one first partition is arranged on each of the opposite sides of the thermal insulation pad along the direction perpendicular to the thickness direction of the thermal insulation pad.

3. The battery device of claim 1, wherein: The thermal insulation pad further comprises a plurality of second partitions, and at least one second partition is arranged on each of the opposite sides of the thermal insulation pad along the direction perpendicular to the thickness direction of the thermal insulation pad.

4. The battery device of claim 3, wherein: The side edge of the first surface layer is sealingly connected to the side edge of the second surface layer to seal the first gap and the second gap. The first partition is a ring-shaped member, the first partition is arranged around the side of the thermal insulation pad, and the first partition is sealingly connected to the first surface layer and the thermal insulation layer to seal the first gap.

5. The battery device of claim 4, wherein: The second partition is a ring-shaped member, the second partition is arranged around the side of the thermal insulation pad, and the second partition is sealingly connected to the second surface layer and the thermal insulation layer to seal the second gap.

6. The battery device of claim 3, wherein: The first partition is an elastic member, and the second partition is an elastic member. The thickness of the first partition is 0.5-1.2 microns along the thickness direction of the thermal insulation pad, and the thickness of the second partition is 0.5-1.2 microns along the thickness direction of the thermal insulation pad.

7. The battery device of claim 3, wherein: The thermal insulation pad further comprises a third partition, the first surface layer and the second surface layer are provided with the third partition on at least one of the opposite sides along the direction perpendicular to the thickness direction of the thermal insulation pad, the opposite sides of the thermal insulation layer are connected to the corresponding third partitions, the first surface layer, a part of the third partition, and the thermal insulation layer form the first gap, and the second surface layer, another part of the third partition, and the thermal insulation layer form the second gap.

8. The battery device of claim 3, wherein: The middle part of the thermal insulation layer is provided with a buffer structure between the first gap and the second gap.

9. The battery device of claim 1, wherein: The buffer structure comprises a buffer hole, and the buffer hole is connected to the first gap and the second gap.

10. The battery device according to any one of claims 1 to 9, characterized by: The buffer structure comprises a plurality of buffer holes, and the buffer holes are uniformly arranged in the middle part of the thermal insulation layer.

11. The battery device of claim 10, wherein: ​ 12. The battery device of claim 11, wherein: ​ 13. The battery device of claim 12, wherein: The buffer hole has a diameter of 0.01mm to 1mm, and / or the sum of the cross-sectional areas of the buffer holes is less than or equal to one-tenth of the surface area of the thermal insulation layer.

14. The battery device of claim 12, wherein: The buffer structure comprises a thinned region having a thickness less than the thickness of the thermal insulation layer at other locations.

15. The battery device according to any one of claims 1 to 9, characterized by: The thermal insulation layer is a composite layer of a fibrous material and a porous powder ceramic.

16. The battery device of claim 15, wherein: The thermal insulation layer has a porosity of 80% to 99%.

17. The battery device according to any one of claims 1 to 9, characterized by: The thermal insulation layer has a thermal conductivity of less than 0.23W / (m·K) at room temperature.

18. The battery device according to any one of claims 1 to 9, characterized by: The thermal insulation layer has a thickness of 1mm to 10mm.

19. The battery device according to any one of claims 1 to 9, characterized by: The first face layer has a thickness of 0.01μm to 0.1μm, and / or the second face layer has a thickness of 0.01μm to 0.1μm.

20. The battery device according to any one of claims 1 to 9, characterized by: The first face layer and the second face layer are both insulating layers.

21. The battery device according to any one of claims 1 to 9, characterized by: The first face layer is a polyimide face layer, a polyethylene terephthalate face layer, a polypropylene face layer, a polycarbonate face layer, a polyvinyl chloride face layer, or a polyurethane face layer. The second face layer is a polyimide face layer, a polyethylene terephthalate face layer, a polypropylene face layer, a polycarbonate face layer, a polyvinyl chloride face layer, or a polyurethane face layer.

22. A battery device, characterized by A plurality of the battery cells of any one of claims 1 to 21.

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