Box structure, energy storage device, battery device and power utilization device

Abstract

The embodiment of the utility model discloses a box body structure, an energy storage device, a battery device and a power utilization device, the box body structure comprises a plurality of first walls, a first heat reflection layer and a second heat reflection layer, the plurality of first walls are encircled to form an accommodating cavity, the accommodating cavity is used for accommodating a battery monomer, the plurality of first walls comprise at least one second wall, and the second wall comprises at least one first heat reflection layer and at least one second heat reflection layer; the surface of the second wall away from the accommodating cavity faces the heat source. The first heat reflection layer is arranged on the side, away from the containing cavity, of the second wall. The second heat reflection layer is arranged on the sides, facing the containing cavity, of the multiple first walls. Therefore, heat radiated into the box body structure by the heat source can be reduced, and the reliability of the energy storage device or the power utilization device is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a box structure, an energy storage device, a battery device, and an electrical device. Background Art

[0002] In the case of a relatively high ambient temperature, the energy storage device or the battery device is heated by various heat sources such as direct sunlight and ground heat radiation and thus the temperature rises. Currently, the energy storage device or the battery device generally mainly uses a thermal management system to dissipate heat from the battery device or battery cells therein, and this method consumes a large amount of energy. At the same time, in order to balance the requirements of heat dissipation in summer and heat preservation in winter, the design of the thermal management system of the energy storage device or the battery device is relatively complex, which may occupy more space, and thus may reduce the energy density of the energy storage device or the battery device. And if the power of the thermal management system is insufficient, it may lead to a decrease in the reliability of the energy storage device or the battery device.

[0003] Therefore, how to improve the reliability of the energy storage device or the electrical device has become an urgent problem to be solved. Summary of the Utility Model

[0004] Embodiments of the present application provide a box structure, an energy storage device, a battery device, and an electrical device, which can improve the reliability of the energy storage device or the electrical device.

[0005] In a first aspect, a box structure is provided. The box structure includes a plurality of first walls, a first heat-reflecting layer, and a second heat-reflecting layer. The plurality of first walls enclose to form a receiving cavity for receiving battery cells. The plurality of first walls include at least one second wall, and the surface of the second wall away from the receiving cavity faces the heat source. The first heat-reflecting layer is disposed on the side of the second wall away from the receiving cavity. The second heat-reflecting layer is disposed on the side of the plurality of first walls facing the receiving cavity.

[0006] In the technical solution provided by the embodiments of the present application, the second wall facing the heat source among the plurality of first walls of the box structure is provided with the first heat-reflecting layer, so that the heat radiated from the outside of the box structure to the box structure can be reflected, and the amount of heat radiation received by the box structure is reduced. On the other hand, the second heat-reflecting layer is disposed on the side of the plurality of first walls of the box structure facing the receiving cavity, so that the heat generated by the battery cells or the battery device can be reflected, and further, the heat radiated from the inside of the box structure to the outside can be reduced in the case of a relatively low ambient temperature. Therefore, the solution provided by the embodiments of the present application can enable the energy storage device or the battery device to better maintain the internal temperature in different temperature environments, and thus can improve the reliability of the energy storage device or the battery device.

[0007] In some embodiments, the thickness d1 of the first heat-reflecting layer satisfies 0.1 mm ≤ d1 ≤ 5 mm.

[0008] In the technical solution provided by the embodiment of the present application, the thickness d1 of the first heat-reflecting layer satisfies 0.1 mm ≤ d1 ≤ 5 mm. On the one hand, the first heat-reflecting layer can provide good temperature-holding ability for the energy storage device or the battery device. On the other hand, the influence of the first heat-reflecting layer on the overall performance of the energy storage device or the battery device is small. Therefore, when the thickness d1 of the first heat-reflecting layer is within this range, the reliability of the energy storage device or the battery device can be improved.

[0009] In some embodiments, the heat reflectivity of the first heat-reflecting layer is greater than or equal to 85% and less than 100%.

[0010] In the technical solution provided by the embodiment of the present application, the heat reflectivity of the first heat-reflecting layer is greater than or equal to 85% and less than 100%. The first heat-reflecting layer can reflect most of the heat, so as to effectively maintain the temperature inside the box structure, effectively extend the life of the battery cell or the battery device, and reduce the energy consumption of the thermal management system. Furthermore, the reliability of the energy storage device or the battery device can be improved.

[0011] In some embodiments, the infrared emissivity of the first heat-reflecting layer is greater than or equal to 85% and less than 100%.

[0012] In the technical solution provided by the embodiment of the present application, the infrared emissivity of the first heat-reflecting layer is greater than or equal to 85% and less than 100%. The first heat-reflecting layer can radiate most of the absorbed heat, so as to effectively maintain the temperature inside the box structure, effectively extend the life of the battery cell or the battery device, and reduce the energy consumption of the thermal management system. Furthermore, the reliability of the energy storage device or the battery device can be improved.

[0013] In some embodiments, the base material of the first heat-reflecting layer includes one of the following: polyurethane, nano-silica gel.

[0014] In some embodiments, the first heat-reflecting layer includes a plurality of hollow cavities, and the plurality of hollow cavities are distributed in the first heat-reflecting layer.

[0015] In the technical solution provided by the embodiment of the present application, the first heat-reflecting layer includes a plurality of hollow cavities, so as to further improve the heat insulation ability of the first heat-reflecting layer, further improve the ability of the first heat-reflecting layer to maintain the temperature inside the box structure, and further improve the reliability of the energy storage device or the battery device.

[0016] In some embodiments, the box structure further includes a first light-transmitting layer, and the first light-transmitting layer is disposed on the surface of the first heat-reflecting layer away from the second wall.

[0017] In the technical solution provided by the embodiment of the present application, a first light-transmitting layer is disposed on the surface of the first heat-reflecting layer away from the second wall. On the one hand, the first light-transmitting layer can enable infrared light, sunlight, etc. to pass through smoothly, thus having a relatively small impact on the heat-reflecting ability of the first heat-reflecting layer. On the other hand, the first light-transmitting layer can protect the first heat-reflecting layer from mechanical impact, sand and dust, or other wear and tear damage, so that the first heat-reflecting layer can maintain its heat-reflecting ability for a long time, and further improve the stability of the energy storage device or battery device.

[0018] In some embodiments, the thickness d2 of the first light-transmitting layer satisfies 0.3 mm ≤ d2 ≤ 3 mm.

[0019] In the technical solution provided by the embodiment of the present application, the thickness d2 of the first light-transmitting layer satisfies: 0.3 mm ≤ d2 ≤ 3 mm. On the one hand, this thickness is beneficial for the first light-transmitting layer to protect the first heat-reflecting layer, so as to maintain the heat-reflecting ability of the first heat-reflecting layer. On the other hand, this thickness is beneficial for infrared light and sunlight to pass through, and can reduce the influence of the first light-transmitting layer on the first heat-reflecting layer, thereby improving the reliability of the energy storage device or battery device.

[0020] In some embodiments, the mass loss of the wear-resistant coating of the first light-transmitting layer is ≤ 20 mg.

[0021] In the technical solution provided by the embodiment of the present application, the mass loss of the wear-resistant coating of the first light-transmitting layer is ≤ 20 mg. The first light-transmitting layer is not easily worn away, can protect the first heat-reflecting layer for a long time, and thus can improve the stability of the energy storage device or battery device.

[0022] In some embodiments, the drawing strength σ of the first light-transmitting layer satisfies 1 MPa ≤ σ ≤ 90 MPa.

[0023] In the technical solution provided by the embodiment of the present application, the drawing strength σ of the first light-transmitting layer satisfies 1 MPa ≤ σ ≤ 90 Mpa. The first light-transmitting layer has a relatively high adhesion strength, and the first light-transmitting layer can maintain stable adhesion during the use and transportation of the energy storage device or battery device, thereby improving the reliability of the energy storage device or battery device.

[0024] In some embodiments, the tensile strength TS1 of the first light-transmitting layer satisfies 10 MPa ≤ TS1 ≤ 1000 MPa.

[0025] In the technical solution provided by the embodiment of the present application, the tensile strength TS1 of the first light-transmitting layer satisfies 10 MPa ≤ TS1 ≤ 1000 Mpa, so as to reduce the possibility of damage to the first heat-reflecting layer under mechanical impact, and further improve the reliability of the energy storage device or battery device.

[0026] In some embodiments, the tear strength TS2 of the first light-transmitting layer satisfies 10 N / mm ≤ TS2 ≤ 1000 N / mm.

[0027] In the technical solution provided by the embodiments of the present application, the tear strength TS2 of the first light-transmitting layer satisfies 10 N / mm ≤ TS2 ≤ 1000 N / mm, so that the possibility of the first light-transmitting layer being damaged under mechanical impact can be reduced, and further the reliability of the energy storage device or the battery device can be improved.

[0028] In some embodiments, the base material of the first light-transmitting layer is polyurea.

[0029] In some embodiments, the box structure further includes a heat insulation layer, and the heat insulation layer is disposed between the first heat-reflecting layer and the second wall.

[0030] In the technical solution provided by the embodiments of the present application, a heat insulation layer is disposed between the first heat-reflecting layer and the second wall, which can reduce the heat transfer between the heat absorbed by the first heat-reflecting layer and the second wall, and at the same time reduce the amount of heat radiated from the heat absorbed by the second heat-reflecting layer to the external environment through the second wall. Thus, disposing a heat insulation layer between the first heat-reflecting layer and the second wall can improve the reliability of the energy storage device or the battery device.

[0031] In some embodiments, the thickness d3 of the heat insulation layer satisfies 0.1 mm ≤ d3 ≤ 3 mm.

[0032] In some embodiments, the base material of the heat insulation layer includes one of the following: nano-silica gel, ceramic, mica.

[0033] In a second aspect, an energy storage device is provided, and the energy storage device includes: the box structure according to any implementation manner of the first aspect.

[0034] In some embodiments, the plurality of first walls include a bottom wall and a top wall disposed opposite to each other, and side walls adjacent to the bottom wall and the top wall. The bottom wall is located at the lower part of the energy storage device along the direction of gravity. Among them, the second wall includes a top wall and a side wall.

[0035] In a third aspect, a battery device is provided, and the battery device is disposed in an electrical device. The battery device includes the box structure according to any implementation manner of the first aspect.

[0036] In a fourth aspect, an electrical device is provided, and the electrical device includes the battery device according to the third aspect and a chassis, and the chassis is disposed opposite to the road surface. Among them, the chassis includes a second wall or the second wall is disposed opposite to the chassis.

[0037] In some embodiments, the electrical device is a vehicle, a ship or a spacecraft. Description of the Drawings

[0038] Figure 1Shows a schematic diagram of an energy storage device provided by an embodiment of the present application;

[0039] Figure 2 Shows a schematic diagram of an electrical device provided by an embodiment of the present application;

[0040] Figure 3 Shows a schematic diagram of a battery device provided by an embodiment of the present application;

[0041] Figure 4 Shows a schematic diagram of a box structure provided by an embodiment of the present application;

[0042] Figure 5 Shows the present application Figure 4 A schematic cross-sectional view of area A of the second wall in the provided box structure;

[0043] Figure 6 Shows the present application Figure 4 A schematic cross-sectional view of area B of the first wall in the provided box structure;

[0044] Figure 7 Shows the present application Figure 4 Another possible schematic cross-sectional view of area A of the second wall in the provided box structure;

[0045] Figure 8 Shows the present application Figure 4 Yet another possible schematic cross-sectional view of area A of the second wall in the provided box structure;

[0046] Figure 9 Shows the present application Figure 4 Still another possible schematic cross-sectional view of area A of the second wall in the provided box structure;

[0047] Figure 10 Shows the present application Figure 4 One more possible schematic cross-sectional view of area A of the second wall in the provided box structure;

[0048] Figure 11 Shows the present application Figure 4 Other possible schematic cross-sectional views of area A of the second wall in the provided box structure.

[0049] Reference numerals:

[0050] 1-Vehicle; 10-Battery device; 11-Housing; 20-Battery cell; 30-Controller; 40-Motor; 100-Energy storage device; 110-Top wall; 111-First housing part; 112-Second housing part; 120-Side wall; 130-Thermal management module; 140-Bottom wall; 200-Housing structure; 210-First wall; 220-Receiving cavity; 230-Second wall; 211-First heat reflective layer; 212-Second heat reflective layer; 213-First light transmissive layer; 2111-Hollow cavity; 214-Thermal insulation layer; 215-Second light transmissive layer;

[0051] In the drawings, the drawings are not drawn to actual scale. Detailed implementation manners

[0052] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0053] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present application belong to the scope of protection of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific order or primary-secondary relationship.

[0055] Reference to "embodiments" in the present application means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0056] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", "joined", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0057] The term "and / or" in the present application is merely an association relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0058] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed descriptions of the same components are omitted. It should be understood that the thicknesses, lengths, widths, etc. of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device are only illustrative descriptions and should not constitute any limitation to the present application.

[0059] The term "a plurality of" as used in the present application refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of sheets" refers to two or more sheets (including two sheets).

[0060] If there is no special instruction, all the implementation manners and optional implementation manners of the present application can be combined with each other to form a new technical solution.

[0061] The box structure described in the embodiments of the present application can be applied to an energy storage device, and the energy storage device can include one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster can include a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0062] The energy storage device can be used in an energy storage power station, a wind power generation system, a solar power generation system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during the low electricity consumption period and provide electrical energy to relevant users or electrical equipment during the high electricity consumption period.

[0063] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0064] In some embodiments, the energy storage device may include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0065] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a general control module, a power distribution module, and a fire protection module.

[0066] The box structure described in the embodiments of the present application may be applicable to a battery device. The battery device may include one or more battery monomer assemblies for providing voltage and capacity. The battery monomer assembly may include a plurality of battery monomers, and the plurality of battery monomers are connected in series, parallel, or in a hybrid connection through a busbar component.

[0067] In some embodiments, the battery monomer assembly is generally formed by arranging a plurality of battery monomers.

[0068] As an example, the battery monomer assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery monomers into an independent module. As an example, the battery module may be formed by bundling a plurality of battery monomers with cable ties.

[0069] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box body and one or more battery monomer assemblies, and the battery monomer assemblies are accommodated in the box body.

[0070] As an example, the battery monomer assembly may be a battery module, and the battery monomer assembly may be accommodated in the box body by fixing the battery module in the box body.

[0071] As an example, the battery monomer assembly may also be accommodated in the box body by directly fixing a plurality of battery monomers to the box body.

[0072] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are buckled so that a closed space is formed inside the box body to accommodate the battery monomer assembly. The term "closed" here means covering or closing, which may be sealed or non-sealed. The first box body may be a top cover or a bottom plate.

[0073] As an example, the box body may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery monomer assembly.

[0074] In some embodiments, the box body may be part of the chassis structure of a vehicle. For example, a part of the box body may become at least a part of the floor of the vehicle, or a part of the box body may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0075] The battery device provided by the embodiments of the present application can be applicable to electrical devices, such as mobile phones, portable devices, laptops, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0076] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0077] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so as to be used continuously.

[0078] The battery cell 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application do not limit this.

[0079] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0080] As an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0081] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0082] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0083] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0084] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are buckled so that a closed space is formed inside the box body to accommodate the battery cell assembly. The term "closed" here means covering or closing, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0085] As an example, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0086] In the case of a relatively high ambient temperature, the energy storage device or battery device is heated by various heat sources such as direct sunlight and ground thermal radiation and thus its temperature rises. At present, the energy storage device or battery device generally mainly uses a thermal management system to dissipate heat from the battery device or battery cell therein, and this method consumes a large amount of energy. At the same time, in order to balance the requirements of heat dissipation in summer and heat preservation in winter, the design of the thermal management system of the energy storage device or battery device is relatively complex, which may occupy more space, and thus may reduce the energy density of the energy storage device or battery device. If the power of the thermal management system is insufficient, it may lead to a decrease in the reliability of the energy storage device or battery device.

[0087] Therefore, how to improve the reliability of the energy storage device or power-consuming device has become an urgent problem to be solved.

[0088] The present application provides a box structure in an embodiment. The box structure includes a plurality of first walls, a first heat-reflecting layer, and a second heat-reflecting layer. The plurality of first walls enclose to form a receiving cavity for receiving battery cells. The plurality of first walls include a second wall, and the surface of the second wall away from the receiving cavity faces the heat source. The first heat-reflecting layer is disposed on the side of the second wall away from the receiving cavity. The second heat-reflecting layer is disposed on the side of the plurality of first walls facing the receiving cavity.

[0089] In the technical solution provided by the embodiment of the present application, the second wall of the plurality of first walls of the box structure facing the heat source is provided with a first heat-reflecting layer, so that the heat radiated from the outside of the box structure to the box structure can be reflected, and the amount of heat radiation received by the box structure is reduced. On the other hand, the second heat-reflecting layer is disposed on the side of the plurality of first walls of the box structure facing the receiving cavity, so that the heat generated by the battery cells or battery device can be reflected, and further, the heat radiated from the inside of the box structure to the outside can be reduced in the case of a relatively low ambient temperature. Therefore, the solution provided by the embodiment of the present application can enable the energy storage device or battery device to better maintain the internal temperature in different temperature environments, and thus can improve the reliability of the energy storage device or battery device.

[0090] For the convenience of description in the following embodiments, Figures 1 to 3 scenarios applicable to the embodiments of the present application are exemplarily given.

[0091] For example, Figure 1 shows a schematic diagram of an energy storage device provided by an embodiment of the present application; Figure 2 shows a schematic diagram of a power-consuming device provided by an embodiment of the present application.

[0092] The energy storage device 100 provided by the embodiments of the present application may include one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0093] Exemplarily, the shape of the energy storage device 100 may be a cuboid, but the embodiments of the present application are not limited thereto, and the energy storage device 100 may also be other shapes. In addition, for the convenience of transportation and to reduce transportation costs, the energy storage device 100 of the embodiments of the present application may be a standard-sized container. For example, 20-foot or 40-foot containers may be used, but the embodiments of the present application are not limited thereto.

[0094] Exemplarily, the energy storage device 100 may include a top wall 110 and a bottom wall 140 that are oppositely arranged, and side walls 120 that are adjacent to the top wall 110 and the bottom wall 140.

[0095] The energy storage device may be disposed on the ground. The top wall 110 is more likely to be directly irradiated by sunlight, and the side walls 120 are more likely to be thermally radiated from the ground. The bottom wall 140 is located at the lower part of the energy storage device 100 along the gravity direction.

[0096] The energy storage device 100 may further include a main control module. As an example, the main control module may serve as a battery management unit of the battery cluster and is used to monitor and manage the battery cluster. The main control module may monitor information such as the current, voltage, power, or temperature of the battery cluster. For example, it may control the charge and discharge current, voltage, etc. of the battery cluster. The main control module includes an auxiliary battery management unit, a fusion switch, and other modules.

[0097] The energy storage device 100 may further include a thermal management module 130. The thermal management module 130 may accommodate thermal management components to perform thermal management on the energy storage device 100. For example, heating or cooling the energy storage device 100. As an example, the thermal management module may include a liquid cooling unit, and the liquid cooling unit provides coolant for adjusting the temperature of the battery cells to each battery device through pipelines.

[0098] The energy storage device 100 may further include an electrical module. The electrical module may include electrical components. For example, it may include at least one of the following components: a distribution box, an inverter, a main control box, and a fan.

[0099] The energy storage device 100 may further include a busbar module. The busbar module may include busbar components, and the busbar components are used for electrical connection with the main control module, etc. For example, the high-voltage wires from the main control module may be connected to the busbar components through the wire grooves at the bottom of the box body. For example, the busbar components may achieve the parallel connection between multiple main control boxes.

[0100] The above is only exemplary. The energy storage device 100 may include more components than the above examples, or some components of the above examples may be absent. The embodiments of the present application do not limit this.

[0101] For the convenience of description in the following embodiments, the electrical device is taken as the vehicle 1 for illustration.

[0102] For example, as Figure 2 shown, it is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery device 10 may be arranged inside the vehicle 1. The controller 30 is used to control the power supply of the battery device 10 to the motor 40. For example, the battery device 10 may be arranged at the bottom, the front or the rear of the vehicle 1. The battery device 10 may be used for the power supply of the vehicle 1. For example, the battery device 10 may be used as the operating power supply of the vehicle 1 for the circuit system of the vehicle 1, for example, for the working power requirements during the start, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery device 10 may not only be used as the operating power supply of the vehicle 1, but also be used as the driving power supply of the vehicle 1 to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0103] Figure 3 It shows a schematic diagram of the battery device 10 provided by an embodiment of the present application.

[0104] As Figure 3 shown, the battery device 10 according to the embodiment of the present application may include a battery cell 20 assembly. The battery cell 20 assembly may include one or more battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 according to the embodiment of the present application may be set according to actual applications. For example, the battery cell 20 may be a square shell battery as Figure 3 shown, or it may also be other shapes different from Figure 3 shown. The embodiments of the present application are not limited thereto.

[0105] It should be understood that as Figure 3 shown, the battery device 10 according to the embodiment of the present application may further include a box body 11. The box body 11 may be used to accommodate the battery cell 20 assembly. The battery cell 20 assembly may include one or more battery cells 20. The inside of the box body 11 according to the embodiment of the present application is a hollow structure, and a plurality of battery cells 20 are accommodated in the box body 11. The box body 11 may include a plurality of parts, for example Figure 2The shown box body 11 can include two parts, which are respectively referred to as the first box body part 111 and the second box body part 112 here. These two parts are only schematic and should not constitute an undue limitation to this application. In other embodiments, these two parts may also have other names. The first box body part 111 and the second box body part 112 are snapped together. The shapes of the first box body part 111 and the second box body part 112 can be determined according to the shapes of the components accommodated inside. For example, they can be determined according to the shape of the combination of multiple battery cells 20 accommodated inside. At least one of the first box body part 111 and the second box body part 112 has an opening. For example, as Figure 3 shown, both the first box body part 111 and the second box body part 112 can be hollow cuboids with one face being the opening face. The openings of the first box body part 111 and the second box body part 112 are arranged opposite to each other, and the first box body part 111 and the second box body part 112 are snapped together to form a box body 11 with a closed chamber, and this chamber can be used to accommodate multiple battery cells 20. Multiple battery cells 20 are placed inside the box body 11 formed after the first box body part 111 and the second box body part 112 are snapped together after being connected in parallel or in series or in a mixed connection. In some embodiments, the box body 11 can also include three parts. For example, it can respectively include the first box body part 111, the second box body part 112 and a frame.

[0106] For another example, different from Figure 3 shown, only one of the first box body part 111 and the second box body part 112 can also be a hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second box body part 112 as a hollow cuboid with an opening and the first box body part 111 as plate-shaped as an example, then the first box body part 111 covers the opening of the second box body part 112 to form a box body 11 with a closed chamber, and this chamber can be used to accommodate multiple battery cells 20.

[0107] The battery device 10 can also be integrated into an electrical device. For example, the box body 11 of the battery device 10 can be a part of the electrical device. Exemplarily, the electrical device can be a vehicle 1, and the chassis of the vehicle 1 can be used as a part of the box body 11 of the battery device 10, and the chassis is arranged opposite to the road surface. The chassis can include a part of the box body 11 of the battery device 10 or the box body 11 is arranged inside the chassis.

[0108] Some components of the battery device 10 are schematically drawn in the figure, but the battery device 10 can also include other components. For example, the battery device 10 can also include a partition, and a part of the space in the battery device 10 is separated by the partition.

[0109] The battery device 10 may also be provided with a thermal management mechanism, and the thermal management mechanism may provide thermal management for the battery cells 20 in the form of a cooling plate. The battery cells 20 may also be partially or fully immersed in a thermal management medium, and the thermal management mechanism provides thermal management for the battery cells 20 through the thermal management medium.

[0110] The following combines Figures 4 to 6 to illustrate the housing structure 200 provided by an embodiment of the present application.

[0111] Figure 4 shows a schematic diagram of the housing structure 200 provided by an embodiment of the present application; Figure 5 shows the present application Figure 4 a cross-sectional schematic diagram of area A of the second wall 230 in the provided housing structure 200; Figure 6 shows the present application Figure 4 a cross-sectional schematic diagram of area B of the first wall 210 in the provided housing structure 200.

[0112] In some possible embodiments, the housing structure 200 includes a plurality of first walls 210, a first heat-reflecting layer 211, and a second heat-reflecting layer 212. The plurality of first walls 210 enclose to form a receiving cavity 220 for receiving the battery cells 20. The plurality of first walls 210 include a second wall 230, and the surface of the second wall away from the receiving cavity faces the heat source. The first heat-reflecting layer 211 is disposed on the side of the second wall 230 away from the receiving cavity 220. The second heat-reflecting layer 212 is disposed on the side of the plurality of first walls 210 facing the receiving cavity 220.

[0113] The battery cells 20 in the receiving cavity 220 may be directly disposed in the receiving cavity 220. The battery cells 20 in the receiving cavity 220 may also be disposed in other components. For example, the battery cells 20 may be disposed in the housing 11 of the battery device 10, and the battery device 10 is disposed in the receiving cavity 220.

[0114] The housing structure 200 may be a structure composed of the top wall 110, the bottom wall 140, and the side wall 120 of the energy storage device 100. The housing structure 200 may also be the housing 11 of the battery device 10. The solution of the embodiment of the present application may be applicable to both the energy storage device 100 and the battery device 10. The battery device 10 may be disposed in an electrical device to provide electrical energy.

[0115] Such as Figure 5 , a first heat-reflecting layer 211 is disposed on the side of the second wall 230 of the housing structure 200 away from the receiving cavity 220, and a second heat-reflecting layer 212 is disposed on the side of the second wall 230 of the housing structure 200 facing the receiving cavity 220.

[0116] Such as Figure 6As shown, among the more than 200 first walls 210 of the box structure 200, the first walls 210 other than the second wall 230 may be provided with a second heat-reflecting layer 212 only on the side facing the accommodation cavity 220, and no coating is provided on the side away from the accommodation cavity 220. Not providing a coating on the side of the first wall 210 that does not face the heat source and is away from the accommodation cavity 220 can save coating costs.

[0117] The first heat-reflecting layer 211 and the second heat-reflecting layer 212 may use the same material or different materials, and the embodiments of the present application do not limit this.

[0118] The first heat-reflecting layer 211 or the second heat-reflecting layer 212 can reflect the heat radiated to the surface of the first heat-reflecting layer 211 or the second heat-reflecting layer 212, thereby playing a role in heat reflection.

[0119] The first heat-reflecting layer 211 or the second heat-reflecting layer 212 can also absorb the heat radiated to the first heat-reflecting layer 211 or the second heat-reflecting layer 212 and then radiate it outward, thereby playing a role in heat reflection.

[0120] The heat outside the box structure 200 is radiated to the first heat-reflecting layer 211, and the first heat-reflecting layer 211 can reflect this part of the heat, thereby maintaining the temperature of the battery cells 20 or the battery device 10 in the accommodation cavity 220 inside the box structure 200.

[0121] Exemplarily, the multiple first walls 210 of the box structure 200 include the top wall 110, the bottom wall 140, and the side walls 120 of the energy storage device 100. The multiple first walls 210 enclose the accommodation cavity 220, and the battery device 10 can be accommodated in the accommodation cavity 220.

[0122] Exemplarily, the box structure 200 is the box 11 of the battery device 10, and the multiple first walls 210 enclose the accommodation cavity 220, and the battery cells 20 can be accommodated in the accommodation cavity 220.

[0123] Exemplarily, the heat source can be ground heat radiation, the sun, or other heat sources.

[0124] Exemplarily, the second wall 230 among the multiple first walls 210 includes the top wall 110 and the side walls 120 of the energy storage device 100. The first heat-reflecting layer 211 provided on the top wall 110 can absorb the radiation of sunlight and radiate the heat into the air. The first heat-reflecting layer 211 provided on the side walls 120 can absorb the ground heat radiation and radiate the heat into the air. Since the bottom surface opposite to the bottom wall 140 is generally not directly heated, even if the first heat-reflecting layer 211 is not provided on the bottom wall 140, the energy storage device 100 can still have good heat insulation.

[0125] Exemplarily, the box structure 200 is the box 11 of the battery device 10. The battery device 10 is used for an electrical device, and the electrical device includes a chassis. The chassis may include a second wall 230, or the second wall 230 may be disposed opposite to the chassis. When the electrical device is in use, the chassis faces the heat source. For example, during the driving of the vehicle 1, the chassis faces the road surface and thus is more likely to generate heat. Therefore, providing a first heat reflection layer 211 on the outer surface of the second wall 230 can greatly reduce the heat absorbed by the battery device 10.

[0126] A second heat reflection layer 212 is provided on one side of the plurality of first walls 210 facing the inside of the accommodation cavity 220. In an environment with a relatively low temperature, the heat generated by the battery cell 20 or the battery device 10 is reflected by the second heat reflection layer 212, so that the temperature of the energy storage device 100 or the battery device 10 can be maintained.

[0127] In the technical solution provided by the embodiment of the present application, a first heat reflection layer 211 is provided on the second wall 230 of the plurality of first ones of the box structure 200 that faces the heat source, so that the heat radiated from the outside of the box structure 200 to the box structure 200 can be reflected, reducing the amount of heat radiation received by the box structure 200. On the other hand, a second heat reflection layer 212 is provided on one side of the plurality of first walls 210 of the box structure 200 facing the accommodation cavity 220, so that the heat generated by the battery cell 20 or the battery device 10 can be reflected, and further, the heat radiated from the inside of the box structure 200 to the outside can be reduced when the ambient temperature is relatively low. Therefore, the solution provided by the embodiment of the present application can enable the energy storage device 100 or the battery device 10 to better maintain the internal temperature in different temperature environments, thereby improving the reliability of the energy storage device 100 or the battery device 10.

[0128] In some possible embodiments, the thickness d1 of the first heat reflection layer 211 satisfies 0.1 mm ≤ d1 ≤ 5 mm.

[0129] The thickness d1 of the first heat reflection layer 211 is greater than or equal to 0.1 mm. The thickness of the first heat reflection layer 211 can provide a better effect of reflecting the heat radiated from the outside of the box structure 200, thereby increasing the ability of the energy storage device 100 or the battery device 10 to maintain the temperature. The thickness d1 of the first heat reflection layer 211 is less than or equal to 5 mm. The thickness of the first heat reflection coating is not too large, which has little impact on the overall performance such as the weight of the energy storage device 100 or the battery device 10. At the same time, the thickness d1 of the first heat reflection layer 211 being less than or equal to 5 mm is also beneficial to controlling the cost of the first heat reflection layer 211.

[0130] In the technical solution provided by the embodiments of the present application, the thickness d1 of the first heat-reflecting layer 211 satisfies 0.1 mm ≤ d1 ≤ 5 mm. On the one hand, the first heat-reflecting layer 211 can provide better temperature retention ability for the energy storage device 100 or the battery device 10. On the other hand, the first heat-reflecting layer 211 has less impact on the overall performance of the energy storage device 100 or the battery device 10. Therefore, when the thickness d1 of the first heat-reflecting layer 211 is within this range, the reliability of the energy storage device 100 or the battery device 10 can be improved.

[0131] Further, the thickness d1 of the first heat-reflecting layer 211 can satisfy 0.2 mm ≤ d1 ≤ 3 mm. When the thickness d1 of the first heat-reflecting layer 211 is within this range, on the one hand, the first heat-reflecting layer 211 can have higher heat-reflecting ability. On the other hand, the first heat-reflecting layer 211 has less impact on the energy storage device 100 or the battery device 10, and the cost of the first heat-reflecting layer 211 is lower.

[0132] The thickness d1 of the first heat-reflecting layer 211 can also take other values. Exemplarily, the thickness d1 of the first heat-reflecting layer 211 can take any one of the following values or the range between any two of the following values: 0.1 mm, 0.35 mm, 0.59 mm, 0.84 mm, 1.08 mm, 1.33 mm, 1.57 mm, 1.82 mm, 2.06 mm, 2.31 mm, 2.55 mm, 2.8 mm, 3.04 mm, 3.29 mm, 3.53 mm, 3.78 mm, 4.02 mm, 4.26 mm, 4.51 mm, 4.75 mm, and 5.0 mm.

[0133] In some possible embodiments, the heat-reflecting rate of the first heat-reflecting layer 211 is greater than or equal to 85% and less than 100%.

[0134] The heat-reflecting rate can be obtained through a comparative test. Exemplarily, the box structure 200 provided with the first heat-reflecting layer 211 and the box structure 200 without the first heat-reflecting layer 211 are placed in a high-temperature environment (such as 35°C - 60°C). After detecting for 10 hours, the temperature change values of the two are measured, and the heat reflected by the first heat-reflecting layer 211 is calculated according to the temperature change values of the two. And calculate the percentage of the heat absorbed by the box structure 200 without the first heat-reflecting layer 211 as the heat-reflecting rate. The heat-reflecting rate can also be measured by other methods, and the embodiments of the present application do not limit this.

[0135] For example, the infrared reflectance can be measured. A near-infrared spectrometer can be used. A near-infrared light source with sufficient intensity and consistency is used to irradiate the sample, and the light intensity value reflected by the sample is recorded. The ratio of it to the incident light intensity is the infrared reflectance.

[0136] In the technical solution provided by the embodiment of the present application, the thermal reflectivity of the first thermal reflection layer 211 is greater than or equal to 85% and less than 100%. The first thermal reflection layer 211 can reflect most of the heat, so as to effectively maintain the temperature inside the box structure 200, effectively extend the life of the battery cell 20 or the battery device 10, and reduce the energy consumption of the thermal management system. Furthermore, the reliability of the energy storage device 100 or the battery device 10 can be improved.

[0137] Further, the thermal reflectivity of the first thermal reflection layer 211 may be greater than or equal to 90% and less than 100%. When the thermal reflectivity is within this range, the ability of the first thermal reflection layer 211 to maintain the temperature inside the box structure 200 can be further improved.

[0138] The thermal reflectivity of the first thermal reflection layer 211 may also take other values. Exemplarily, the thermal reflectivity of the first thermal reflection layer 211 may take any one of the following values or the range between any two of the following values: 85.0%, 85.75%, 86.5%, 87.25%, 88.0%, 88.75%, 89.5%, 90.25%, 91.0%, 91.75%, 92.5%, 93.25%, 94.0%, 94.75%, 95.5%, 96.25%, 97.0%, 97.75%, 98.5% and 99.25%.

[0139] In some possible embodiments, the infrared emissivity of the first thermal reflection layer 211 is greater than or equal to 85% and less than 100%.

[0140] The measurement of the infrared emissivity can adopt the energy method. Using a Fourier analysis spectrometer, the infrared radiation power of the absolute black body and the sample are measured respectively by the same detector at the same temperature, and the ratio of the two is the infrared emissivity value of the material.

[0141] In the technical solution provided by the embodiment of the present application, the infrared emissivity of the first thermal reflection layer 211 is greater than or equal to 85% and less than 100%. The first thermal reflection layer 211 can radiate most of the absorbed heat, so as to effectively maintain the temperature inside the box structure 200, effectively extend the life of the battery cell 20 or the battery device 10, and reduce the energy consumption of the thermal management system. Furthermore, the reliability of the energy storage device 100 or the battery device 10 can be improved.

[0142] Further, the infrared emissivity of the first thermal reflection layer 211 may be greater than or equal to 90% and less than 100%. When the infrared emissivity is within this range, the ability of the first thermal reflection layer 211 to maintain the temperature inside the box structure 200 can be further improved.

[0143] The infrared emissivity of the first heat-reflecting layer 211 can also take other values. Exemplarily, the infrared emissivity of the first heat-reflecting layer 211 can take any one of the following values or the range between any two of the following values: 85.0%, 85.75%, 86.5%, 87.25%, 88.0%, 88.75%, 89.5%, 90.0%, 91.0%, 91.75%, 92.5%, 93.25%, 94.0%, 94.75%, 95.5%, 96.25%, 97.0%, 97.75%, 98.5%, and 99.25%.

[0144] In some possible embodiments, the substrate of the first heat-reflecting layer 211 includes at least one of the following: polyurethane, nano-silica gel.

[0145] Exemplarily, the substrate of the first heat-reflecting layer 211 is polyurethane or waterborne polyurethane, and a polyurethane heat-reflecting layer with a thickness of 0.2 mm - 0.6 mm is provided on the side of the second wall 230 away from the accommodation cavity 220. This polyurethane heat-reflecting layer does not undergo visible changes under 1000 hours of ultraviolet irradiation. And the heat reflectivity of this polyurethane heat-reflecting layer to sunlight can reach 90%, and it also has good reflection ability to infrared light with a wavelength below 2.5 μm. At the same time, the polyurethane heat-reflecting layer has high infrared emission characteristics, can radiate infrared light with a wavelength of 8 - 13 μm outward, and can quickly dissipate heat into the environment.

[0146] Exemplarily, the substrate of the first heat-reflecting layer 211 is nano-silica gel, and a nano-silica gel heat-reflecting layer with a thickness of 0.5 mm - 5 mm is provided on the side of the second wall 230 away from the accommodation cavity 220.

[0147] Figure 7 Shows another possible schematic diagram of the cross-section of the A area of the second wall 230 in the box structure 200 provided by the present application Figure 4

[0148] In some possible embodiments, the first heat-reflecting layer 211 includes a plurality of hollow cavities 2111, and the plurality of hollow cavities 2111 are distributed within the first heat-reflecting layer 211.

[0149] The hollow cavities 2111 can be provided in the first heat-reflecting layer 211 in various ways. For example, the first heat-reflecting layer 211 can be thermally sprayed, and during the cooling process of the first heat-reflecting layer 211, the gas therein forms hollow cavities 2111 in the first heat-reflecting layer 211. Again, for example, hollow cavities 2111 can also be formed by filling hollow microspheres. The present application does not limit this.

[0150] ​The hollow cavity 2111 can be seen by observing the first heat-reflecting layer 211 through a microscope. The hollow cavity 2111 can also be tested by other means, which is not limited in the embodiments of the present application.

[0151] The hollow cavity 2111 can have a certain heat storage capacity, so as to reduce the speed at which the heat absorbed by the first heat-reflecting layer 211 is transferred to the second wall 230, and further improve the ability of the first heat-reflecting layer 211 to maintain the internal temperature of the box structure 200.

[0152] In the technical solution provided by the embodiments of the present application, the first heat-reflecting layer 211 includes the hollow cavity 2111, which can further improve the heat insulation ability of the first heat-reflecting layer 211, further improve the ability of the first heat-reflecting layer 211 to maintain the internal temperature of the box structure 200, and thus improve the reliability of the energy storage device 100 or the battery device 10.

[0153] Figure 8 Shows the present application Figure 4 Another possible schematic diagram of the cross-section of the A area of the second wall 230 in the box structure 200 provided.

[0154] In some possible embodiments, the box structure 200 further includes a first light-transmitting layer 213, and the first light-transmitting layer 213 is disposed on the surface of the first heat-reflecting layer 211 away from the second wall 230.

[0155] The first light-transmitting layer 213 can have good light-transmitting performance, so that infrared light, sunlight, etc. can reach the first heat-reflecting layer 211 and pass through the first light-transmitting layer 213 after being reflected by the first heat-reflecting layer 211 and reach the environment. At the same time, the first light-transmitting layer 213 is disposed on the surface of the first heat-reflecting layer 211 away from the second wall 230. When subjected to mechanical impact, sand and dust or other abrasions, the first light-transmitting layer 213 can protect the first heat-reflecting layer 211 from being damaged by mechanical impact, sand and dust or other abrasions.

[0156] In the technical solution provided by the embodiments of the present application, the first light-transmitting layer 213 is disposed on the surface of the first heat-reflecting layer 211 away from the second wall 230. On the one hand, the first light-transmitting layer 213 can enable infrared light, sunlight, etc. to pass through smoothly, thus having a small impact on the heat-reflecting ability of the first heat-reflecting layer 211. On the other hand, the first light-transmitting layer 213 can protect the first heat-reflecting layer 211 from being damaged by mechanical impact, sand and dust or other abrasions, so that the first heat-reflecting layer 211 can maintain the heat-reflecting ability for a long time, and thus improve the stability of the energy storage device 100 or the battery device 10.

[0157] In some possible embodiments, the thickness d2 of the first light-transmitting layer 213 satisfies: 0.3 mm ≤ d2 ≤ 3 mm.

[0158] The thickness d2 of the first light-transmitting layer 213 is greater than or equal to 0.3 mm. The first light-transmitting layer 213 can play a better protective role and is beneficial to maintaining the heat reflection ability of the first heat-reflecting layer 211. The thickness d2 of the first light-transmitting layer 213 is less than or equal to 3 mm, which is beneficial to the transmission of infrared light and sunlight and can reduce the influence of the first light-transmitting layer 213 on the first heat-reflecting layer 211.

[0159] In the technical solution provided by the embodiment of the present application, the thickness d2 of the first light-transmitting layer 213 satisfies: 0.3 mm ≤ d2 ≤ 3 mm. On the one hand, this thickness is beneficial for the first light-transmitting layer 213 to protect the first heat-reflecting layer 211, so as to maintain the heat reflection ability of the first heat-reflecting layer 211. On the other hand, this thickness is beneficial for the transmission of infrared light and sunlight, can reduce the influence of the first light-transmitting layer 213 on the first heat-reflecting layer 211, and thus can improve the reliability of the energy storage device 100 or the battery device 10.

[0160] Further, the thickness d2 of the first light-transmitting layer 213 satisfies: 0.35 mm ≤ d2 ≤ 2 mm. When the thickness d2 of the first light-transmitting layer 213 is within this range, the thickness of the first light-transmitting layer 213 is not too thin, thereby reducing the difficulty of the spraying process. On the other hand, the thickness of the first light-transmitting layer 213 is not too thick, thereby reducing the cost of the first light-transmitting layer 213.

[0161] The thickness d2 of the first light-transmitting layer 213 can also take other values. Exemplarily, the thickness d2 of the first light-transmitting layer 213 can take any one of the following values or the range between any two values: 0.3 mm, 0.35 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, and 3.0 mm.

[0162] In some possible embodiments, the mass loss of the wear-resistant coating of the first light-transmitting layer 213 ≤ 20 mg.

[0163] The measurement method of the mass loss of the wear-resistant coating can be determined by referring to the method provided in "GB / T 1768-2006 Paints and varnishes - Determination of resistance to abrasion - Rotating rubber wheel method".

[0164] The mass loss of the wear-resistant coating of the first light-transmitting layer 213 ≤ 20 mg. The first light-transmitting layer 213 has good wear resistance. In the case of being worn by sand and dust, etc., the first light-transmitting layer 213 is not easily worn away, so that it can stably exist on the surface of the first heat-reflecting layer 211.

[0165] In the technical solution provided by the embodiment of the present application, the mass loss of the wear-resistant coating of the first light-transmitting layer 213 is ≤ 20 mg, and the first light-transmitting layer 213 is not easily worn away, which can protect the first heat-reflecting layer 211 for a long time, thereby improving the stability of the energy storage device 100 or the battery device 10.

[0166] Furthermore, the mass loss of the wear-resistant coating of the first light-transmitting layer 213 is ≤ 15 mg. When the first light-transmitting layer 213 is scratched, obvious abrasion marks are not easily generated, so that the light-transmitting performance of the first light-transmitting layer 213 can be maintained, the influence on the light-transmitting performance of the first light-transmitting layer 213 during long-term use can be reduced, and further the stability of the energy storage device 100 or the battery device 10 can be improved.

[0167] The mass loss of the wear-resistant coating of the first light-transmitting layer 213 can also be other values. Exemplarily, the mass loss of the wear-resistant coating of the first light-transmitting layer 213 can take any one of the following values or the range between any two values: 0.1 mg, 0.2 mg, 0.5 mg, 0.8 mg, 1 mg, 2 mg, 5 mg, 6 mg, 8 mg, 9 mg, 10 mg, 11 mg, 12 mg, 13 mg, 14 mg, 15 mg, 16 mg, 17 mg, 18 mg, 19 mg, and 20 mg.

[0168] In some possible embodiments, the draw strength σ of the first light-transmitting layer 213 satisfies 1 MPa ≤ σ ≤ 90 MPa.

[0169] The draw strength σ can be measured by referring to the method provided in "GB / T 5210-2006 Paints and varnishes - Pull-off test for adhesion".

[0170] The draw strength σ of the first light-transmitting layer 213 satisfies 1 MPa ≤ σ ≤ 90 MPa, the first light-transmitting layer 213 has good adhesion ability, and the adhesion strength between the first light-transmitting layer 213 and the first heat-reflecting layer 211 is relatively high. In the case of certain mechanical impacts, the first light-transmitting layer 213 is not easily detached, so as to better protect the first heat-reflecting layer 211.

[0171] In the technical solution provided by the embodiment of the present application, the draw strength σ of the first light-transmitting layer 213 satisfies 1 MPa ≤ σ ≤ 90 Mpa, the adhesion strength of the first light-transmitting layer 213 is relatively high, and the first light-transmitting layer 213 can maintain stable adhesion during the use and transportation of the energy storage device 100 or the battery device 10, thereby improving the reliability of the energy storage device 100 or the battery device 10.

[0172] Further, the drawing strength σ of the first light-transmitting layer 213 satisfies 2 MPa ≤ σ ≤ 70 MPa. When the lower limit of the drawing strength of the first light-transmitting layer 213 increases, the adhesion between the first light-transmitting layer 213 and the first heat-reflecting layer 211 can be strengthened. When the upper limit of the drawing strength of the first light-transmitting layer 213 decreases, the first light-transmitting layer 213 is not easily attached to the spraying port of the spraying equipment, and the spraying difficulty of the first light-transmitting layer 213 can be reduced.

[0173] The drawing strength σ of the first light-transmitting layer 213 can also take other values. Exemplarily, the drawing strength σ of the first light-transmitting layer 213 can take any one of the following values or the range between any two values: 1.0 MPa, 5.45 MPa, 9.9 MPa, 14.35 MPa, 18.8 MPa, 23.25 MPa, 27.7 MPa, 32.15 MPa, 36.6 MPa, 41.05 MPa, 45.5 MPa, 49.95 MPa, 54.4 MPa, 58.85 MPa, 63.3 MPa, 67.75 MPa, 72.2 MPa, 76.65 MPa, 81.1 MPa, 85.55 MPa, and 90.0 MPa.

[0174] In some possible embodiments, the tensile strength TS1 of the first light-transmitting layer 213 satisfies: 10 MPa ≤ TS1 ≤ 1000 Mpa.

[0175] The tensile strength TS1 can be measured with reference to the method provided in "GB / T 528-2009 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties".

[0176] When the tensile strength TS1 of the first light-transmitting layer 213 satisfies 10 MPa ≤ TS1 ≤ 1000 Mpa, the first light-transmitting layer 213 has good tensile properties. When the first light-transmitting layer 213 is subjected to mechanical impact, the first light-transmitting layer 213 can provide a high stress to resist the mechanical impact, thereby reducing the damage to the first heat-reflecting layer 211.

[0177] In the technical solution provided by the embodiments of the present application, the tensile strength TS of the first light-transmitting layer 213 satisfies: 10 MPa ≤ TS1 ≤ 1000 Mpa, so as to reduce the possibility of damage to the first heat-reflecting layer 211 under mechanical impact, and further improve the reliability of the energy storage device 100 or the battery device 10.

[0178] Further, the tensile strength TS1 of the first light-transmitting layer 213 satisfies 20 MPa ≤ σ ≤ 700 MPa. When the lower limit of the tensile strength of the first light-transmitting layer 213 increases, the ability of the first light-transmitting layer 213 to buffer mechanical impact can be strengthened. When the upper limit of the tensile strength of the first light-transmitting layer 213 decreases, the first light-transmitting layer 213 is more easily ejected from the spraying port, reducing the spraying difficulty of the first light-transmitting layer 213.

[0179] The tensile strength TS1 of the first light-transmitting layer 213 can also be other values. Exemplarily, the tensile strength TS1 of the first light-transmitting layer 213 can take any one of the following values or the range between any two of the following values: 10.0 MPa, 59.5 MPa, 109.0 MPa, 158.5 MPa, 208.0 MPa, 257.5 MPa, 307.0 MPa, 356.5 MPa, 406.0 MPa, 455.5 MPa, 505.0 MPa, 554.5 MPa, 604.0 MPa, 653.5 MPa, 703.0 MPa, 752.5 MPa, 802.0 MPa, 851.5 MPa, 901.0 MPa, 950.5 MPa, and 1000.0 MPa.

[0180] In some possible embodiments, the tear strength TS2 of the first light-transmitting layer 213 satisfies: 10 N / mm ≤ TS2 ≤ 1000 N / mm.

[0181] The tear strength TS2 can be measured with reference to the method provided in "GB / T 529-2008 Determination of tear strength of vulcanized rubber or thermoplastic rubber (trouser, right-angle and crescent specimens)".

[0182] The tear strength TS2 of the first light-transmitting layer 213 satisfies: 10 N / mm ≤ TS2 ≤ 1000 N / mm. The first light-transmitting layer 213 has a certain tear resistance. When subjected to mechanical impact, the first light-transmitting layer 213 is not easily damaged, so as to continuously protect the first heat-reflecting layer 211.

[0183] In the technical solution provided by the embodiments of the present application, the tear strength TS2 of the first light-transmitting layer 213 satisfies: 10 N / mm ≤ TS2 ≤ 1000 N / mm, so that the possibility of the first light-transmitting layer 213 being damaged under mechanical impact can be reduced, and thus the reliability of the energy storage device 100 or the battery device 10 can be improved.

[0184] In certain possible embodiments, the substrate of the first light-transmitting layer 213 is polyurea.

[0185] Combined Figure 9 and Figure 10 to illustrate the box structure provided by a certain embodiment of the present application.

[0186] Figure 9 Shows Figure 4 Another possible schematic diagram of the cross-section of area A of the second wall 230 in the box structure 200 provided by the present application; Figure 10 Shows Figure 4 Still another possible schematic diagram of the cross-section of area A of the second wall 230 in the box structure 200 provided by the present application.

[0187] In some possible embodiments, the box structure 200 further includes a heat insulation layer 214, and the heat insulation layer 214 is disposed between the first heat reflection layer 211 and the second wall 230.

[0188] Wherein, Figure 10 Relative to Figure 9 the box structure in [reference], a first light-transmitting layer 213 is disposed on the surface of the second wall 230 away from the accommodation cavity, so as to further improve the reliability of the energy storage device 100 or the battery device 10.

[0189] In the technical solution provided by the embodiment of the present application, a heat insulation layer 214 is disposed between the first heat reflection layer 211 and the second wall 230, which can reduce the heat transfer between the heat absorbed by the first heat reflection layer 211 and the second wall 230, and at the same time reduce the amount of heat absorbed by the second heat reflection layer 212 radiated to the external environment through the second wall 230. Thus, disposing the heat insulation layer 214 between the first heat reflection layer 211 and the second wall 230 can improve the reliability of the energy storage device 100 or the battery device 10.

[0190] In some possible embodiments, the thickness d3 of the heat insulation layer 214 satisfies: 0.1 mm ≤ d3 ≤ 3 mm.

[0191] When the thickness d3 of the heat insulation layer 214 is greater than or equal to 0.1 mm, the heat insulation layer 214 can play a good heat insulation role, which is beneficial to maintaining the temperature of the accommodation cavity 220. When the thickness d3 of the heat insulation layer 214 is less than or equal to 3 mm, it is beneficial to save material costs.

[0192] Further, the thickness d3 of the heat insulation layer 214 satisfies: 1 mm ≤ d2 ≤ 2 mm. When the thickness d3 of the heat insulation layer 214 is within this range, the thickness of the heat insulation layer 214 is not too thin, so that it can play a good heat insulation effect. On the other hand, the thickness of the heat insulation layer 214 is not too thick, thereby reducing the cost of the heat insulation layer 214.

[0193] The thickness d3 of the heat insulation layer 214 can also be other values. Exemplarily, the thickness d3 of the heat insulation layer 214 can take any one of the following values or the range between any two values: 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, and 3.0 mm.

[0194] In some possible embodiments, the base material of the heat insulation layer 214 is selected from at least one of the following: nano-silica gel, ceramics, and mica.

[0195] Figure 11 shows the present application Figure 4 Another possible cross-sectional schematic view of area A of the second wall 230 in the box structure 200 provided by the present application.

[0196] In some possible embodiments, a second light-transmitting layer 215 may also be provided on the side of the second heat-reflecting layer 212 facing the accommodation cavity 220.

[0197] In the technical solution provided by the embodiments of the present application, a second light-transmitting layer 215 is provided on the side of the second heat-reflecting layer 212 facing the accommodation cavity 220, so that the mechanical shock generated during the transportation and use of the interior of the box structure 200 can be absorbed by the second light-transmitting layer 215, thereby protecting the second heat-reflecting layer 212 and being beneficial to maintaining the heat preservation performance of the second heat-reflecting layer 212.

[0198] According to some embodiments of the present application, a energy storage device is provided, and the energy storage device includes the box structure in any of the above embodiments.

[0199] According to some embodiments of the present application, a battery device is provided, the battery device is applied to an electrical device, and the battery device includes the box structure in any of the above embodiments.

[0200] According to some embodiments of the present application, an electrical device is provided, the electrical device includes the battery device and a chassis in any of the above embodiments, the chassis is disposed opposite to the road surface, wherein the chassis includes the second wall 230 or the second wall 230 is disposed opposite to the chassis.

[0201] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A box structure, characterized in that, The box structure includes: A plurality of first walls (210), the plurality of first walls (210) enclose to form a receiving cavity (220), the receiving cavity (220) is used to receive battery cells (20), the plurality of first walls (210) include at least one second wall (230), and the surface of the second wall (230) away from the receiving cavity (220) faces a heat source; A first heat reflective layer (211), the first heat reflective layer (211) is disposed on the side of the second wall (230) away from the receiving cavity (220); A second heat reflective layer (212), the second heat reflective layer (212) is disposed on the side of the plurality of first walls (210) facing the receiving cavity (220).

2. The box structure according to claim 1, wherein, The thickness d1 of the first heat reflective layer (211) satisfies: 0.1 mm ≤ d1 ≤ 5 mm.

3. The box structure according to claim 1, wherein The heat reflectivity of the first heat reflective layer (211) is greater than or equal to 85% and less than 100%.

4. The cabinet structure according to claim 1, wherein, The infrared emissivity of the first heat reflective layer (211) is greater than or equal to 85% and less than 100%.

5. The box structure according to claim 1, characterized in that, The substrate of the first heat reflective layer (211) includes one of the following: Polyurethane, nano-silica gel.

6. The box body structure according to claim 1, characterized in that The first heat reflective layer (211) includes: A plurality of hollow cavities (2111), the plurality of hollow cavities (2111) are distributed in the first heat reflective layer (211).

7. The box body structure according to claim 1, characterized in that, The box structure further includes: A first light-transmitting layer (213), the first light-transmitting layer (213) is disposed on the surface of the first heat reflective layer (211) away from the second wall (230).

8. The box structure according to claim 7, characterized in that, The thickness d2 of the first light-transmitting layer (213) satisfies: 0.3 mm ≤ d2 ≤ 3 mm.

9. The box structure according to claim 7, wherein, The mass loss of the wear-resistant coating of the first light-transmitting layer (213) ≤ 20 mg.

10. The box body structure according to claim 7, characterized in that, The pull-out strength σ of the first light-transmitting layer (213) satisfies 1 MPa ≤ σ ≤ 90 MPa.

11. The box structure according to claim 7, characterized in that, The tensile strength TS1 of the first light-transmitting layer (213) satisfies: 10 MPa ≤ TS1 ≤ 1000 MPa.

12. The cabinet structure according to claim 7, characterized in that, The tear strength TS2 of the first light-transmitting layer (213) satisfies: 10 N / mm ≤ TS2 ≤ 1000 N / mm.

13. The box structure according to claim 7, wherein, The substrate of the first light-transmitting layer (213) is polyurea.

14. The box structure according to any one of claims 1 to 13, characterized in that, The box structure further includes: A heat insulation layer (214), the heat insulation layer (214) is disposed between the first heat reflective layer (211) and the second wall (230).

15. The box structure according to claim 14, wherein, The thickness d3 of the heat insulation layer (214) satisfies: 0.1 mm ≤ d3 ≤ 3 mm.

16. The box structure according to claim 14, characterized in that, The substrate of the heat insulation layer (214) includes one of the following: Nano-silica gel, ceramics, mica.

17. An energy storage device, characterized in that, The energy storage device includes: The box structure according to any one of claims 1 to 16.

18. The energy storage device according to claim 17, wherein, The plurality of first walls (210) include a bottom wall (140) and a top wall (110) disposed opposite to each other, and side walls (120) adjacent to the bottom wall (140) and the top wall (110), and the bottom wall (140) is located at the lower part of the energy storage device along the gravity direction; Wherein, the second wall (230) includes the top wall (110) and the side walls (120).

19. A battery device, characterized in that, The battery device is applied to an electrical device, and the battery device includes: The box structure according to any one of claims 1 to 16.

20. An electrical device, characterized in that, The electrical device includes a chassis and a battery device according to claim 19, the chassis being disposed opposite to the road surface; Wherein, the chassis includes the second wall (230) or the second wall (230) is disposed opposite to the chassis.

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