Battery device, power utilization device and vehicle

Abstract

The utility model discloses a battery device, a power utilization device and a vehicle. The battery device comprises at least one battery monomer; the heat exchange plate comprises a first plate and a second plate which are overlapped with each other, a flow channel for a heat exchange medium to flow is formed between the first plate and the second plate, the first plate and the battery monomers are arranged close to each other, and the second plate is arranged on one side, opposite to the battery monomers, of the first plate; the heat conductivity coefficient of the first plate is higher than that of the second plate. The first plate is close to the battery monomers, and the heat conductivity coefficient of the first plate is relatively high, so that the first plate can efficiently exchange heat with the battery monomers, and the temperature of the battery monomers can be well managed; the heat exchange performance of the second plate and the part deviating from the side of the first plate is poor, so that waste of heat energy or cold energy of the heat exchange medium is reduced, the utilization rate of the heat energy or cold energy of the heat exchange medium is improved, the temperature control efficiency of the single battery is improved, and the heat management capability of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device, a power utilization device and a vehicle. BACKGROUND

[0002] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like. In new energy vehicles equipped with batteries, the batteries can be used to provide power in whole or in part. In the field of energy storage, the batteries can be installed in an energy storage box or directly installed at a user side.

[0003] The existing battery pack exchanges heat with the battery monomers in the battery pack through a liquid cooling structure having cooling liquid flowing therethrough to control and manage the temperature of the battery pack. The cooling effect of the liquid cooling structure is related to the service life and the charging and discharging capacity of the battery pack. Therefore, how to improve the thermal management capability of the battery pack is one of the research topics in the industry. CONTENT OF THE UTILITY MODEL

[0004] To solve the above technical problems, the present application provides a battery device, a power utilization device and a vehicle with good thermal management capability.

[0005] The present application is implemented through the following technical solutions.

[0006] The first aspect of the present application provides a battery device, comprising: at least one battery monomer; a heat exchange plate comprising a first plate and a second plate stacked with each other, a flow channel for flowing a heat exchange medium being formed between the first plate and the second plate, the first plate being arranged close to the battery monomer, and the second plate being arranged on a side of the first plate away from the battery monomer; and wherein the thermal conductivity of the first plate is higher than that of the second plate.

[0007] In the technical solution of the embodiment of the present application, since the first plate is close to the battery monomer and has a high thermal conductivity, it can efficiently exchange heat with the battery monomer and well manage the temperature of the battery monomer. Since the thermal conductivity of the second plate is low, the heat exchange performance of the second plate with the components on the side away from the first plate is poor, thereby reducing the waste of heat energy or cold energy of the heat exchange medium, improving the utilization rate of the heat energy or cold energy of the heat exchange medium, improving the efficiency of the temperature control of the battery monomer, and further improving the thermal management capability of the battery device.

[0008] In some embodiments, the battery device further comprises a battery box comprising a box body and a box cover covering the box body, a containing space containing the battery monomer being formed between the box cover and the box body, the second plate being arranged on the box body, the first plate being arranged on a side of the second plate facing the box cover, and the battery monomer being in contact with the first plate.

[0009] The battery box covers the outside of the battery monomer, and protects the battery monomer. By setting the battery monomer and the first plate in contact with each other, the heat exchange effect between the heat exchange plate and the battery monomer is further improved.

[0010] In some embodiments, the box body includes a bottom plate and a frame surrounding the bottom plate, a containing groove is formed between the bottom plate and the frame, an end edge of the frame away from the bottom plate surrounds a containing slot, the box cover covers the containing slot to form a containing space, the second plate is connected to the frame, the first plate is arranged on a side of the second plate away from the bottom plate, and a space is formed between the first plate and the frame.

[0011] The second plate is connected to the frame, so that the heat exchange plate is fixed to the frame. The space between the first plate and the frame reduces the heat exchange between the first plate and the frame, thereby reducing the amount of heat energy or cold energy in the heat exchange plate dissipated outward through the frame, further reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of the temperature control of the battery monomer, and further improving the thermal management capability of the battery device.

[0012] In some embodiments, the second plate includes an overlapping portion and an excess portion surrounding the outer periphery of the overlapping portion, the orthogonal projection of the overlapping portion coincides with the orthogonal projection of the first plate, and the orthogonal projection of the excess portion does not overlap with the orthogonal projection of the first plate in the direction perpendicular to the first plate, the excess portion is connected to the frame, and a space is formed between the outer peripheral edge of the first plate and the surface of the frame facing the containing groove.

[0013] In this way, by providing a space between the first plate and the frame, the heat exchange efficiency between the first plate and the frame is reduced, thereby reducing the amount of heat energy or cold energy in the heat exchange plate dissipated outward through the frame, reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of the temperature control of the battery monomer, and further improving the thermal management capability of the battery device.

[0014] In some embodiments, the surface of the excess portion facing the box cover is bonded to the surface of the frame away from the box cover through a first bonding layer; and / or, the excess portion is connected to the surface of the frame away from the box cover through a first fastener.

[0015] Thus, the connection between the second plate and the frame is achieved through the adhesion of the first adhesive layer and / or the connection of the first fastener, and since the first plate and the second plate are connected, the relative positions of the first plate and the frame are defined, so that the first plate and the frame remain in a state of having a spacing, thereby reducing the heat exchange efficiency between the first plate and the frame, so as to reduce the amount of heat energy or cold energy in the heat exchange plate dissipated outward through the frame, reduce the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of the battery cell temperature control, and further improving the thermal management capability of the battery device.

[0016] In some embodiments, the box further comprises a cross beam connected to the frame, the cross beam is arranged on the side of the first plate away from the second plate, the cross beam is arranged between adjacent battery cells, and the first plate and the cross beam have a spacing therebetween.

[0017] Thus, by arranging the cross beam, the structural strength of the box is improved. The first plate and the cross beam have a spacing therebetween, which reduces the heat exchange between the first plate and the cross beam, thereby reducing the amount of heat energy or cold energy in the heat exchange plate dissipated outward through the cross beam, reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of the battery cell temperature control, and further improving the thermal management capability of the battery device.

[0018] In some embodiments, the first plate is formed with a through hole, and the second plate is provided with a pad block, the pad block is arranged protruding towards the cross beam relative to the surface of the second plate abutting the first plate, the pad block abuts the cross beam after passing through the through hole, and the thermal conductivity of the pad block is lower than that of the first plate.

[0019] The pad block is arranged between the second plate and the cross beam to maintain the spacing therebetween, and since the relative positions between the first plate and the second plate are fixed, the pad block maintains the spacing between the first plate and the cross beam, and the thermal conductivity of the pad block is relatively low, which inhibits the heat exchange between the first plate and the cross beam through the pad block, thereby reducing the heat exchange efficiency between the first plate and the cross beam, so as to reduce the amount of heat energy or cold energy in the heat exchange plate dissipated outward through the cross beam, reduce the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of the battery cell temperature control, and further improving the thermal management capability of the battery device.

[0020] In some embodiments, the pad block and the second plate are formed in an integral structure.

[0021] Therefore, the connection strength of the two is high, and the process of connecting the two is omitted, thereby improving the production efficiency. The spacer maintains the interval between the first plate and the cross beam, thereby reducing the heat exchange efficiency between the first plate and the frame, reducing the amount of heat energy or cold energy in the heat exchange plate dissipated outward through the cross beam, reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of the battery cell temperature control, and further improving the thermal management capability of the battery device.

[0022] In some embodiments, the spacer and the second plate are in a split structure.

[0023] The spacer and the second plate are in a split structure, so that the structure of the second plate is relatively simple, facilitating production and manufacturing. The spacer maintains the interval between the first plate and the cross beam, thereby reducing the heat exchange efficiency between the first plate and the frame, reducing the amount of heat energy or cold energy in the heat exchange plate dissipated outward through the cross beam, reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of the battery cell temperature control, and further improving the thermal management capability of the battery device.

[0024] In some embodiments, the spacer and the second plate are made of the same or different materials.

[0025] Therefore, the spacer and the second plate have a wide range of material options, which is beneficial to reduce costs.

[0026] In some embodiments, the second plate, the spacer, and the cross beam are connected by a second fastener, and the second fastener includes a rivet nut.

[0027] The rivet nut passes through the second plate, the spacer, and the cross beam in sequence, so that the second plate, the spacer, and the cross beam are connected together, improving the structural strength of the box body, and also facilitating the maintenance of the interval between the cross beam and the first plate, thereby further facilitating the improvement of the thermal management effect. In some embodiments, the opposite ends of the cross beam are connected to the frame, respectively.

[0028] Therefore, the connection between the cross beam and the frame is more secure, further improving the structural strength of the box body, and also facilitating the maintenance of the interval between the cross beam and the first plate, thereby further facilitating the improvement of the thermal management effect.

[0029] In some embodiments, the frame and / or the cross beam are made of aluminum material.

[0030] The aluminum material is light in weight and low in cost, which is beneficial to suppress the cost investment of the battery device.

[0031] In some embodiments, the bottom plate includes a heat exchange plate.

[0032] Therefore, the heat exchange plate serves as at least part of the bottom plate, which is beneficial to save space and improve the volume energy density of the battery device.

[0033] In some embodiments, the first plate comprises a metal plate; and / or, the second plate comprises a non-metal plate.

[0034] The first plate comprises a metal plate, so that the first plate has a higher thermal conductivity, can efficiently exchange heat with the battery monomer, and well manages the temperature of the battery monomer. The second plate comprises a non-metal plate, so that the second plate has a lower thermal conductivity, and the heat exchange performance of the second plate with the components away from the side of the first plate is poor, thereby reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, thereby improving the efficiency of the battery monomer temperature control, and further improving the thermal management capability of the battery device.

[0035] In some embodiments, the first plate comprises an aluminum plate.

[0036] Aluminum is light in weight, low in cost and high in thermal conductivity, which is conducive to improving the heat exchange efficiency and reducing the cost input.

[0037] In some embodiments, the second plate comprises a plurality of layers of continuous fiber composite material layers arranged in layers, each layer of continuous fiber composite material layer comprises continuous fibers and a thermoplastic resin matrix, and the thermoplastic resin matrix connects the continuous fibers.

[0038] The composite material formed by the continuous fibers and the thermoplastic resin matrix can be made into the second plate by molding, and the shape after processing is good in shape retention and is not easy to warp and deform, and can be well fitted with the first plate. Moreover, the composite material formed by the continuous fibers and the thermoplastic resin matrix has the characteristics of high strength, high rigidity and high toughness, which helps to improve the structural strength and structural rigidity of the second plate. In addition, the composite material has very high specific rigidity, and the minimum wall thickness of the second plate is not limited by the process, and compared with injection molding, a smaller wall thickness can meet the rigidity requirement, thereby achieving the purpose of weight reduction.

[0039] In some embodiments, the plurality of layers of continuous fiber composite material layers arranged in layers are combined to form a continuous fiber composite plate, and the continuous fiber composite plate is formed into the second plate by molding.

[0040] In the above technical solution, the plurality of layers of continuous fiber composite material layers are first combined to form a continuous fiber composite plate, and the continuous fiber composite plate is then formed into the second plate by molding. The molding process can more accurately ensure the shape and size precision of the second plate, so as to as far as possible ensure the mechanical properties and structural integrity of the second plate.

[0041] In some embodiments, the thermoplastic resin matrix comprises a polyamide unit, and in the polyamide unit, the ratio of the number of carbons on the main carbon chain of the polyamide unit to the number of amide groups is not less than 8.

[0042] Thus, by controlling the ratio of the number of carbons to the number of amide groups in the single structural unit of the thermoplastic resin matrix, the number of CHx groups (methyl and methylene groups) in the single polyamide unit can be controlled, so as to ensure the strength of the single layer of the continuous fiber composite material layer and the breaking elongation of the single layer of the continuous fiber composite material layer, so that the continuous fiber composite material layer can meet the requirements of high strength and high breaking elongation.

[0043] In some embodiments, the polyamide includes any one or a combination of PA610, PA11, PA12, PA1212, PA1012, and PA1313.

[0044] In some embodiments, the continuous fiber includes one of an organic fiber and an inorganic fiber.

[0045] The organic fiber has high strength, good elasticity and flexibility. The inorganic fiber has high strength and modulus. By matching one or a combination of the organic fiber and the inorganic fiber with the thermoplastic resin, the strength of the single layer of the continuous fiber composite material layer can be improved, thereby improving the strength of the second plate.

[0046] In some embodiments, the inorganic fiber includes any one of glass fiber, aramid fiber or boron fiber; and / or, the organic fiber includes any one of aromatic polyamide fiber and ultra-high molecular weight polyethylene fiber.

[0047] In some embodiments, the weight fraction of the continuous fiber is 60-80, the weight fraction of the thermoplastic resin matrix is 20-40, and the sum of the weight fraction of the continuous fiber and the weight fraction of the thermoplastic resin matrix is 100.

[0048] By controlling the content of the continuous fiber and the thermoplastic resin matrix within a reasonable range, the probability of the continuous fiber leaking out due to the continuous fiber content being too high and the resin matrix content being too low can be reduced, and the probability of the composite material not being strong enough due to the continuous fiber content being too low and the resin matrix content being too high can also be reduced, i.e., the content of the continuous fiber and the content of the thermoplastic resin matrix are balanced, so that the performance of the composite material is suitable for making the second plate.

[0049] In some embodiments, the first plate and the second plate are bonded by a second bonding layer.

[0050] The first plate and the second plate are connected by bonding, which is conducive to improving the sealing performance at the connection interface between the two, thereby reducing the probability of the flow channel leaking the heat exchange medium, and further improving the heat management effect. Moreover, the use of the bonding process reduces the risk of heavy metal pollution caused by brazing.

[0051] In some embodiments, the second adhesive layer has a glass transition temperature greater than 60℃; and / or, the second adhesive layer has a body tensile strength greater than 15 MPa; and / or, the second adhesive layer has a room temperature shear strength greater than 15 MPa; and / or, the second adhesive layer has a shear strength at 80℃ and -40℃ greater than 10 MPa.

[0052] In this way, the use of such a material with such properties makes the bonding between the first plate and the second plate firm and long-lasting, thereby prolonging the service life of the heat exchange plate and improving the heat management effect.

[0053] In some embodiments, the first plate is a flat plate, and the second plate is recessed towards a side away from the first plate to form a groove extending along a curve, and the first plate is stacked on the groove side of the second plate to form a flow channel.

[0054] By providing the first plate as a flat plate, the first plate can be brought into more complete contact with the battery monomer. The second plate is provided with a groove, so that the second plate and the first plate are stacked to form a flow channel for the heat exchange medium to flow, thereby achieving the heat exchange function of the heat exchange plate.

[0055] The second aspect of the present application provides a power consuming device, comprising the battery device provided in the first aspect, and the battery device is used to store or provide electric energy.

[0056] Since the battery device has good heat management capability, the power consuming device comprising the battery device also has good heat management capability.

[0057] The third aspect of the present application provides a vehicle, comprising a chassis, a vehicle body arranged on the chassis, and a battery device provided in the first aspect arranged on the chassis.

[0058] Since the battery device has good heat management capability, the vehicle comprising the battery device also has good heat management capability.

[0059] In some embodiments, the vehicle body and the chassis jointly form a passenger compartment of the vehicle, and the battery box of the battery device forms a floor of the passenger compartment.

[0060] By integrating the battery device into the floor of the passenger compartment, additional supports and connecting members can be reduced, which helps to reduce the overall weight of the vehicle, and the internal space of the vehicle can be more effectively utilized.

[0061] In some embodiments, the vehicle body is arranged above the chassis and detachably connected to the chassis.

[0062] In this way, the vehicle body and the chassis are decoupled, so that the vehicle body can be replaced according to requirements, thereby shortening the development cycle and reducing costs. In other words, the integration of the chassis can be improved, and can be adapted to multiple vehicle models.

[0063] The beneficial effects of the embodiments of the present disclosure include: through the present application, a battery device, an electric device and a vehicle with good heat management capability can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0064] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0065] Figure 1 A structural schematic diagram of a vehicle according to one or more embodiments;

[0066] Figure 2 A perspective exploded schematic diagram of a battery device according to one or more embodiments;

[0067] Figure 3 A perspective structural schematic diagram of a battery cell according to one or more embodiments;

[0068] Figure 4 A perspective exploded schematic diagram of a battery cell according to one or more embodiments;

[0069] Figure 5 A perspective structural schematic diagram of a battery device with a cover removed according to one or more embodiments;

[0070] Figure 6 A sectional view of the structure of a battery device with a cover removed according to one or more embodiments;

[0071] Figure 7 An exploded sectional view of a heat exchange plate according to one or more embodiments;

[0072] Figure 8 A sectional view of a heat exchange plate according to one or more embodiments;

[0073] Figure 9 A Figure 6 Enlarged view of A in FIG. 16;

[0074] Figure 10 A Figure 6 Enlarged view of B in FIG. 16;

[0075] Figure 11 A schematic diagram of one view of a heat exchange plate according to one or more embodiments;

[0076] Figure 12 A schematic diagram of another view of a heat exchange plate according to one or more embodiments;

[0077] Figure 13A schematic view of a disassembled structure of a vehicle according to one or more embodiments.

[0078] Legend of reference signs

[0079] 1000 vehicle; 100 battery device; 200 controller; 300 motor; 400 chassis; 500 vehicle body; 10 battery box; 101 box cover; 102 box body; 1021 bottom plate; 1022 frame; 1023 cross beam; 103 first fastener; 104 second fastener; 104a rivet nut; 1 battery cell; 11 shell; 111 end cap; 112 housing; 12 electrode assembly; 120 tab; 13 electrode terminal; 14 pressure relief mechanism; 2 heat exchange plate; 20 flow channel; 21 first plate; 211 through hole; 22 second plate; 221 overlapping portion; 222 overhanging portion; 223 groove; 23 spacer. DETAILED DESCRIPTION

[0080] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0081] 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 belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and the above drawings description of the present application are intended to cover non-exclusive inclusion.

[0082] In the description of the embodiments of the present application, the technical terms "first", "second", "third" 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. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0083] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0084] In the description of the embodiments of the present application, the term "and / or" is merely an 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 "or" relationship.

[0085] In the description of the embodiments of the present application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed, operated or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0086] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0087] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0088] Next, the present application will be described in detail.

[0089] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only used in energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0090] During use, the battery pack will heat up, which will have some adverse effects on the battery pack itself and the surrounding environment. For example, excessively high temperature will accelerate the rate of internal chemical reactions of the battery cell, causing the battery cell capacity to decay faster, damaging the chemical structure and performance of the battery cell, thereby shortening the service life of the battery pack. The battery cell will have its charge and discharge capacity limited at excessively high temperature, resulting in a decline in the performance of the battery pack. Excessively high temperature will cause the internal pressure to rise, and even cause thermal runaway and explosion, posing a serious safety threat to the user and the surrounding environment. Therefore, the temperature of the battery pack is controlled within an appropriate temperature range by setting a heat exchange structure.

[0091] The inventors of the present application have found that, in order to improve the heat exchange efficiency, some heat exchange structures are made of materials with high thermal conductivity, such as aluminum, so that the battery cell and the plate of the heat exchange structure close to the battery cell can exchange heat well, and the temperature of the battery cell can be controlled. However, the plate of the heat exchange structure away from the battery cell also has high thermal conductivity, which allows external heat to enter the flow channel through the plate, thereby reducing the utilization rate of the cold energy of the cooling liquid, causing waste of low-temperature energy, and reducing the efficiency of temperature control, thereby affecting the thermal management capability of the battery pack.

[0092] The inventors of the present application have found that, by using materials with different thermal conductivities for the two side plates of the heat exchange structure, using a material with high thermal conductivity for the side plate close to the battery cell, and using a material with low thermal conductivity for the side plate away from the battery cell, the battery cell and the side plate with high thermal conductivity can exchange heat well, and the temperature of the battery cell can be efficiently controlled. In addition, the side plate with low thermal conductivity has poor heat exchange performance with the external environment, thereby reducing the waste of the cold energy of the cooling liquid, improving the utilization rate of the cold energy of the cooling liquid, improving the efficiency of temperature control, and improving the thermal management capability of the battery pack.

[0093] Based on this design concept, the inventors of the present application have designed a battery device, which comprises a heat exchange plate and at least one battery cell. The heat exchange plate comprises a first plate and a second plate stacked with each other, and a flow channel for the heat exchange medium to flow is formed between the first plate and the second plate. The first plate is arranged close to the battery cell, and the second plate is arranged on the side of the first plate away from the battery cell. The thermal conductivity of the first plate is higher than that of the second plate.

[0094] The first plate of the design is close to the battery monomer, and the thermal conductivity of the first plate is high, which can efficiently exchange heat with the battery monomer, and well manage the temperature of the battery monomer. In addition, the thermal conductivity of the second plate is low, and the heat exchange performance of the components on the side away from the first plate is poor, which reduces the waste of cooling liquid cold energy, thereby improving the utilization rate of cooling liquid cold energy, and improving the efficiency of battery monomer temperature control, thereby improving the thermal management capability of the battery device.

[0095] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery monomers connected in series, in parallel, or in a hybrid connection through a busbar component.

[0096] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery monomers.

[0097] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery monomers into an independent module. As an example, the battery module can be formed by bundling a plurality of battery monomers with a cable tie.

[0098] In some embodiments, the battery apparatus can be a battery pack including a battery box and one or more battery cell assemblies accommodated in the battery box.

[0099] As an example, the battery cell assembly can be a battery module, which can be accommodated in the battery box by fixing the battery module in the battery box.

[0100] As an example, the battery cell assembly can also be accommodated in the battery box by directly fixing a plurality of battery monomers in the battery box.

[0101] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery apparatuses, 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] The technical solutions described in the embodiments of the present application are applicable to various energy storage devices using battery apparatuses, such as energy storage containers or energy storage cabinets.

[0103] In the following embodiments, for the convenience of description, the power utilization device in an embodiment of the present application is taken as a vehicle 1000 for example. The following description is made in conjunction with the accompanying drawings.

[0104] Figure 1 A structural schematic diagram of the vehicle 1000 according to one or more embodiments.

[0105] The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. As shown in Figure 1 The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0106] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0107] Figure 2 A perspective exploded schematic diagram of the battery device 100 according to one or more embodiments.

[0108] As shown in Figure 2 The battery device 100 includes a battery box 10 and at least one battery cell 1, and the battery box 10 is internally provided with an accommodation space, and the at least one battery cell 1 is accommodated in the accommodation space.

[0109] In some embodiments of the present application, the battery box 10 includes a box body 102 and a box cover 101, and the box cover 101 covers the box body 102, so as to form the accommodation space between the box body 102 and the box cover 101.

[0110] The box body 102 can be a hollow structure with one end open, and the box cover 101 can be a plate-shaped structure, which is combined with the open side of the box body 102 to define the accommodation space together with the box body 102. Alternatively, the box cover 101 and the box body 102 can both be hollow structures with one side open, and the open side of the box cover 101 is combined with the open side of the box body 102. Of course, the battery box 10 formed by the box cover 101 and the box body 102 can have various shapes, such as a cylinder, a cuboid, etc.

[0111] In the battery device 100, the battery cells 1 can be multiple, and the multiple battery cells 1 can be connected in series or in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 1 are connected in series and in parallel. The multiple battery cells 1 can be directly connected in series or in parallel or in a mixed manner, and the whole of the multiple battery cells 1 is placed in the accommodating space formed by the box body 102 and the box cover 101. Of course, the battery device 100 can also be that the multiple battery cells 1 are connected in series or in parallel or in a mixed manner to form a battery module, and the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole, and are accommodated in the accommodating space formed by the box body 102 and the box cover 101. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 1.

[0112] In the embodiments of the present application, the battery cell 1 can be a secondary battery, which means that the battery cell can be activated by charging after discharging.

[0113] The battery cell 1 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 in this regard.

[0114] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, etc. The present application is not particularly limited.

[0115] Figure 3 A perspective structural schematic diagram of the battery cell 1 according to one or more embodiments; Figure 4 A perspective exploded schematic diagram of the battery cell 1 according to one or more embodiments.

[0116] The battery cell 1 refers to the smallest unit that constitutes a battery. Please refer to Figure 3 and Figure 4 The battery cell 1 includes a housing 11, an electrode assembly 12 and other functional components. The housing 11 includes an end cover 111 and a shell 112, the shell 112 has a receiving space and an opening, the electrode assembly 12 is arranged in the receiving space, and the end cover 111 closes the opening of the shell 112.

[0117] The end cover 111 refers to a component that covers the opening of the shell 112 to isolate the internal environment of the battery monomer 1 from the external environment. Without limitation, the shape of the end cover 111 can be adapted to the shape of the shell 112 to fit the shell 112. Optionally, the end cover 111 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 111 is not easily deformed when subjected to extrusion collision, so that the battery monomer 1 can have higher structural strength, and the safety performance can also be improved. The electrode terminal 13 is electrically connected to the electrode assembly 12 for outputting or inputting the electrical energy of the battery monomer 1.

[0118] In some embodiments of the present application, the end cover 111 can also be provided with a pressure relief mechanism 14 for relieving the internal pressure when the internal pressure or temperature of the battery monomer 1 reaches a threshold value. The material of the end cover 111 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations. In some embodiments of the present application, an insulating member can also be provided on the inner side of the end cover 111, which can be used to isolate the electrical connection components in the shell 112 from the end cover 111 to reduce the risk of short circuit. For example, the insulating member can be plastic, rubber, etc.

[0119] The shell 112 is a component for fitting the end cover 111 to form the internal environment of the battery monomer 1, wherein the formed internal environment can be used to accommodate the electrode assembly 12, the electrolyte and other components. The shell 112 and the end cover 111 can be independent components, and an opening can be provided on the shell 112, and the end cover 111 is covered on the opening to form the internal environment of the battery monomer 1. Without limitation, the end cover 111 and the shell 112 can also be integrated, specifically, the end cover 111 and the shell 112 can form a common connecting surface before other components enter the shell, and when it is necessary to encapsulate the internal environment of the shell 112, the end cover 111 is covered on the shell 112. The shell 112 can be various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the shell 112 can be determined according to the specific shape and size of the electrode assembly 12. The material of the shell 112 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations.

[0120] Electrode assembly 12 is the component in the battery cell 1 where the electrochemical reaction occurs. The housing 112 may contain one or more electrode assemblies 12. The electrode assembly 12 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab 120. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 120 connect to the electrode terminals 13 to form a current loop.

[0121] Figure 5 A perspective view of a battery device according to one or more embodiments, with the case cover removed; Figure 6 A cross-sectional view of the structure of a battery device according to one or more embodiments, with the case cover hidden; Figure 7 A cutaway view of a heat exchange plate according to one or more embodiments; Figure 8 A cross-sectional view of a heat exchange plate according to one or more embodiments; Figure 9 for Figure 6 Enlarged view of point A in the middle; Figure 10 for Figure 6 Enlarged view of point B in the middle;

[0122] Figure 11 This is a schematic diagram of a heat exchange plate according to one or more embodiments, from one perspective. Figure 12 This is a schematic diagram of a heat exchange plate according to one or more embodiments from another perspective.

[0123] The first aspect of this application provides a battery device 100, such as... Figures 5 to 8 As shown, the battery device 100 includes a heat exchange plate 2 and at least one battery cell 1. The heat exchange plate 2 includes a first plate 21 and a second plate 22 stacked on top of each other. A flow channel 20 for supplying heat exchange medium is formed between the first plate 21 and the second plate 22. The first plate 21 is disposed close to the battery cell 1, and the second plate 22 is disposed on the side of the first plate 21 facing away from the battery cell 1. The thermal conductivity of the first plate 21 is higher than that of the second plate 22.

[0124] The heat exchange plate 2 is a structure for heat exchange with the battery cell 1, and can be a structure for cooling the battery cell 1 when the temperature of the battery cell 1 rises, or a structure for heating the battery cell 1 when the temperature of the battery cell 1 falls. The heat exchange plate 2 controls the temperature of the battery cell 1 by controlling the temperature of the battery cell 1, so as to control the temperature of the battery cell 1 in a suitable temperature range, thereby improving the performance of the battery device 100 and prolonging the service life of the battery device 100. The heat exchange plate 2 has a flow channel inside, one end of the flow channel has an inlet for the heat exchange medium to enter, and the other end of the flow channel has an outlet for the heat exchange medium to flow out. The heat exchange medium exchanges heat with the components around the heat exchange plate 2 in the process of flowing through the flow channel, and adjusts the temperature of the components around the heat exchange plate 2. One of the first plate 21 and the second plate 22 is provided with a groove extending along a curve or a straight line, and the other is a flat plate. When the two plates are combined, the grooves of the two plates are combined to form a flow channel. Alternatively, both the first plate 21 and the second plate 22 are provided with grooves extending along a curve or a straight line. When the two plates are combined, the grooves of the two plates are combined to form a flow channel.

[0125] The first plate 21 can be made of a material with a high thermal conductivity, such as but not limited to copper, aluminum, copper-aluminum composite material, stainless steel, etc. The first plate 21 can be made of a material with a low thermal conductivity relative to the thermal conductivity of the first plate 21, such as but not limited to ordinary plastic or fiber-reinforced plastic plate, etc.

[0126] The heat exchange medium includes a liquid heat exchange medium or a gas heat exchange medium. The liquid heat exchange medium can be ethylene glycol coolant, glycerol water coolant, or other polyol-based water coolant, or water-based coolant, etc. The gas heat exchange medium can be air, ammonia, nitrogen, hydrogen, carbon dioxide, or alcohol vapor, etc.

[0127] The first plate 21 and the battery cell 1 can be arranged close to each other, and the heat exchange can be performed by contact between the first plate 21 and the battery cell 1. The contact heat exchange can be direct contact or indirect contact. Alternatively, the first plate 21 and the battery cell 1 can be arranged close to each other in space without contact, and the heat exchange can be performed to the extent that the heat exchange between them is possible.

[0128] The battery device 100 provided by the embodiments of the present application has the first plate 21 close to the battery cell 1, and the first plate 21 has a high thermal conductivity, which can efficiently exchange heat with the battery cell 1 and well manage the temperature of the battery cell 1. In addition, the second plate 22 has a low thermal conductivity, and the heat exchange performance between the second plate 22 and the components on the side away from the first plate 21 is poor, thereby reducing the waste of heat energy or cold energy of the heat exchange medium, improving the utilization rate of the heat energy or cold energy of the heat exchange medium, improving the efficiency of temperature control of the battery cell 1, and further improving the thermal management capability of the battery device 100.

[0129] In some embodiments of the present application, as Figure 2 andFigure 5 As shown in the figure, the battery device 100 further comprises a battery box 10, the battery box 10 comprises a box body 102 and a box cover 101 covering the box body 102, the box cover 101 and the box body 102 form a containing space containing the battery monomer 1, the second plate 22 is arranged on the box body 102, the first plate 21 is arranged on the side of the second plate 22 facing the box cover 101, and the battery monomer 1 is in contact with the first plate 21.

[0130] The battery monomer 1 is in contact with the first plate 21, which can be direct contact or indirect contact.

[0131] The battery box 10 covers the outside of the battery monomer 1, which plays a protective role for the battery monomer 1. Furthermore, by arranging the battery monomer 1 and the first plate 21 in contact with each other, the heat exchange effect between the heat exchange plate 2 and the battery monomer 1 is further improved.

[0132] In some embodiments of the present application, as shown in Figure 2 and Figure 6 The box body 102 comprises a bottom plate 1021 and a frame 1022 surrounding the bottom plate 1021, and a containing groove is formed between the bottom plate 1021 and the frame 1022. The edge of the frame 1022 away from the bottom plate 1021 surrounds the containing groove, the box cover 101 covers the containing groove to form the containing space, the second plate 22 is connected with the frame 1022, the first plate 21 is arranged on the side of the second plate 22 away from the bottom plate 1021, and the first plate 21 has a space with the frame 1022.

[0133] For example, as shown in Figure 2 The bottom plate 1021 is arranged separately from the heat exchange plate 2, the heat exchange plate 2 is arranged in the containing groove formed between the bottom plate 1021 and the frame 1022, and the heat exchange plate 2 can be arranged on the side of the battery monomer 1 facing the bottom plate 1021.

[0134] For example, as shown in Figure 6 The heat exchange plate 2 serves as the bottom plate 1021, the heat exchange plate 2 is connected with the frame 1022 to form the containing groove, and at least part of the battery monomer 1 is arranged in the containing groove and in contact with the first plate 21 of the heat exchange plate 2.

[0135] The second plate 22 is connected with the frame 1022, so that the heat exchange plate 2 is fixed to the frame 1022. The first plate 21 has a space with the frame 1022, which reduces the heat exchange between the first plate 21 and the frame 1022, thereby reducing the amount of heat energy or cold energy in the heat exchange plate 2 dissipated outward through the frame 1022, further reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of temperature control of the battery monomer 1, and further improving the thermal management capability of the battery device 100.

[0136] In some embodiments of the present application, asFigures 7 to 9 As shown, the second plate 22 includes an overlapping portion 221 and an overhanging portion 222 surrounding the outer periphery of the overlapping portion 221, and the orthogonal projection of the overlapping portion 221 coincides with the orthogonal projection of the first plate 21 in the direction perpendicular to the first plate 21, and there is no overlapping part between the orthogonal projection of the overhanging portion 222 and the orthogonal projection of the first plate 21, and the overhanging portion 222 is connected to the frame 1022, and there is a gap between the outer peripheral edge of the first plate 21 and the surface of the frame 1022 facing the accommodation groove.

[0137] As shown, the heat exchange plate 2 is used as the bottom plate 1021, the heat exchange plate 2 is connected to the frame 1022 through the overhanging portion 222 of the second plate 22 to form an accommodation groove, and at least part of the battery monomer 1 is arranged in the accommodation groove and in contact with the first plate 21 of the heat exchange plate 2. Figure 9 As shown, the overlapping portion 221 and the overhanging portion 222 are formed in an integrated structure.

[0138] As shown, the dashed line in the figure is the boundary line between the overlapping portion 221 and the overhanging portion 222, the overhanging portion 222 is the part of the second plate 22 that exceeds the outer peripheral edge of the first plate 21, and the overhanging portion 222 is connected to the frame 1022, so that there is a gap between the outer peripheral edge of the first plate 21 and the surface of the frame 1022 facing the accommodation groove, that is, as shown, there is a gap L1 between the outer peripheral edge of the first plate 21 and the surface of the frame 1022 facing the accommodation groove.

[0139] Figure 7 As shown, the dashed line in the figure is the boundary line between the overlapping portion 221 and the overhanging portion 222, the overhanging portion 222 is the part of the second plate 22 that exceeds the outer peripheral edge of the first plate 21, and the overhanging portion 222 is connected to the frame 1022, so that there is a gap between the outer peripheral edge of the first plate 21 and the surface of the frame 1022 facing the accommodation groove, that is, as shown, there is a gap L1 between the outer peripheral edge of the first plate 21 and the surface of the frame 1022 facing the accommodation groove. Figure 9

[0140] In this way, by providing a gap between the first plate 21 and the frame 1022, the heat exchange efficiency of the first plate 21 and the frame 1022 is reduced, thereby reducing the amount of heat energy or cold energy in the heat exchange plate 2 dissipated outward through the frame 1022, reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, thereby further improving the efficiency of the temperature control of the battery monomer 1, and further improving the thermal management capability of the battery device 100.

[0141] In some embodiments of the present application, as shown, the surface of the overhanging portion 222 facing the box cover 101 is bonded to the surface of the frame 1022 away from the box cover 101 through a first bonding layer; and / or, the overhanging portion 222 is connected to the surface of the frame 1022 away from the box cover 101 through a first fastener 103. Figure 9

[0142] ​​​Exemplarily, the material of the first adhesive layer is at least one of acrylic-acrylate copolymer, butadiene-styrene copolymer, styrene-acrylic acid copolymer, styrene-acrylate copolymer, ethylene-vinyl acetate copolymer, acrylic acid grafted polyethylene, maleic anhydride grafted polyethylene, acrylic acid grafted polypropylene, maleic anhydride grafted polypropylene, polyvinylidene fluoride, carboxymethyl cellulose, polyimide, polyetherimide, polyethylene terephthalate, ethylene-vinyl acetate copolymer bisphenol A type epoxy resin, ethylene-vinyl acetate copolymer bisphenol F type epoxy resin, glycerol ether type epoxy resin, glycerol ester type epoxy resin, silicone type resin, polyurethane, styrene-isoprene-styrene copolymer.

[0143] Exemplarily, the first fastener 103 can be, but is not limited to, a flow drill screw, a set screw, etc.

[0144] Exemplarily, the surface of the overhanging portion 222 facing the box cover 101 is adhered to the surface of the frame 1022 away from the box cover 101 by the first adhesive layer, so that the second plate 22 and the frame 1022 are connected, and the adhesion improves the sealing of the connection between the two. Moreover, the overhanging portion 222 is connected to the surface of the frame 1022 away from the box cover 101 by the first fastener 103, and the connection by the first fastener 103 further improves the firmness of the connection between the second plate 22 and the frame 1022.

[0145] In this way, the connection between the second plate 22 and the frame 1022 is achieved by the adhesion of the first adhesive layer and / or the connection of the first fastener 103. Since the first plate 21 and the second plate 22 are connected, the relative positions of the first plate 21 and the frame 1022 are limited, so that the first plate 21 and the frame 1022 remain in a state of having a spacing, thereby reducing the heat exchange efficiency between the first plate 21 and the frame 1022, reducing the amount of heat energy or cold energy in the heat exchange plate 2 dissipated outward through the frame 1022, reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of temperature control of the battery monomer 1, and further improving the thermal management capability of the battery device 100.

[0146] In some embodiments of the present application, as shown in Figure 5 、 Figure 6 and Figure 9 , the box body 102 further comprises a cross beam 1023 connected to the frame 1022. The cross beam 1023 is arranged on the side of the first plate 21 away from the second plate 22, and is arranged between adjacent battery monomers 1. The first plate 21 and the cross beam 1023 have a spacing therebetween.

[0147] Specifically, as shown in Figure 9As shown, the mutually facing surfaces of the first plate 21 and the cross beam 1023 have a spacing L2 therebetween, so as to reduce the heat exchange between the first plate 21 and the cross beam 1023.

[0148] In this way, by arranging the cross beam 1023, the structural strength of the box body 102 is improved. The first plate 21 and the cross beam 1023 have a spacing L2 therebetween, so as to reduce the heat exchange between the first plate 21 and the cross beam 1023, thereby reducing the amount of heat energy or cold energy within the heat exchange plate 2 dissipating outwardly through the cross beam 1023, reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of the temperature control of the battery monomer 1, and further improving the thermal management capability of the battery device 100.

[0149] In some embodiments of the present application, as shown in Figure 10 As shown, the first plate 21 is formed with a through hole 211, and the second plate 22 is provided with a pad 23, the pad 23 is protrudingly arranged relative to the surface of the second plate 22 abutting against the first plate 21 and facing the cross beam 1023, the pad 23 abuts against the cross beam 1023 after passing through the through hole 211, and the thermal conductivity of the pad 23 is lower than that of the first plate 21.

[0150] The material of the pad 23 can be, but is not limited to, fiber, polyester, silica gel pad, polyurethane, etc. The pad 23 can be separately arranged with the second plate 22 or integrally arranged with the second plate 22. The material of the pad 23 can be the same as or different from that of the second plate 22.

[0151] By arranging the pad 23 between the second plate 22 and the cross beam 1023, the spacing between the second plate 22 and the cross beam 1023 is maintained, and since the relative positions between the first plate 21 and the second plate 22 are fixed, the pad 23 maintains the spacing L2 between the first plate 21 and the cross beam 1023, and the thermal conductivity of the pad 23 is relatively low, so as to inhibit the heat exchange between the first plate 21 and the cross beam 1023 through the pad 23, thereby reducing the heat exchange efficiency between the first plate 21 and the cross beam 1023, reducing the amount of heat energy or cold energy within the heat exchange plate 2 dissipating outwardly through the cross beam 1023, reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of the temperature control of the battery monomer 1, and further improving the thermal management capability of the battery device 100.

[0152] In some embodiments of the present application, as shown in Figure 10 As shown, the pad 23 and the second plate 22 are formed in an integral structure.

[0153] For example, the materials of the pad 23 and the second plate 22 are both continuous fiber composite materials, and the two are integrally formed by molding.

[0154] Therefore, the connection strength of the two is high, and the connection process of the two is omitted, thereby improving the production efficiency. The interval L2 between the first plate 21 and the cross beam 1023 is maintained by the cushion block 23, so as to reduce the heat exchange efficiency between the first plate 21 and the frame 1022, thereby reducing the amount of heat energy or cold energy in the heat exchange plate 2 dissipated to the outside through the cross beam 1023, reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of the temperature control of the battery monomer 1, and further improving the thermal management capability of the battery device 100.

[0155] In some embodiments of the present application, the cushion block 23 and the second plate 22 are in a split structure.

[0156] For example, the second plate 22 is formed by continuous fiber composite plate molding, and the cushion block 23 is a heat insulation pad, which is bonded to the surface of the second plate 22 facing the cross beam 1023.

[0157] The cushion block 23 and the second plate 22 are in a split structure, so that the structure of the second plate 22 is relatively simple and easy to produce. The interval L2 between the first plate 21 and the cross beam 1023 is maintained by the cushion block 23, so as to reduce the heat exchange efficiency between the first plate 21 and the frame 1022, thereby reducing the amount of heat energy or cold energy in the heat exchange plate 2 dissipated to the outside through the cross beam 1023, reducing the waste of heat energy or cold energy of the heat exchange medium, thereby improving the utilization rate of the heat energy or cold energy of the heat exchange medium, further improving the efficiency of the temperature control of the battery monomer 1, and further improving the thermal management capability of the battery device 100.

[0158] In some embodiments of the present application, the materials of the cushion block 23 and the second plate 22 are the same or different.

[0159] For example, the materials of the cushion block 23 and the second plate 22 are the same and formed in an integral structure.

[0160] For example, the materials of the cushion block 23 and the second plate 22 are the same and formed in an integral structure.

[0161] For example, the materials of the cushion block 23 and the second plate 22 are different and in a split structure.

[0162] Therefore, the materials of the cushion block 23 and the second plate 22 have a wide range of options, which is beneficial to reduce the cost.

[0163] In some embodiments of the present application, the second plate 22, the cushion block 23 and the cross beam 1023 are connected by a second fastener 104, and the second fastener 104 includes a rivet nut 104a.

[0164] Specifically, as shown in FIG. 6, the second plate 22 is connected to the cross beam 1023 by the second fastener 104, and the second fastener 104 includes the rivet nut 104a. Figure 10As shown, the rivet nut 104a passes through the second plate 22, the cushion block 23 and the cross beam 1023 in sequence, so that the second plate 22, the cushion block 23 and the cross beam 1023 are connected together, the structural strength of the box body 102 is improved, and it is also beneficial to maintain the interval L2 between the cross beam 1023 and the first plate 21, thereby more beneficial to improve the heat management effect.

[0165] In some embodiments of the present application, the opposite two ends of the cross beam 1023 are connected to the frame 1022 respectively.

[0166] For example, the opposite two ends of the cross beam 1023 are connected to the frame 1022 by screws or other fasteners respectively.

[0167] In this way, the connection between the cross beam 1023 and the frame 1022 is improved, the structural strength of the box body 102 is further improved, and it is also beneficial to maintain the interval L2 between the cross beam 1023 and the first plate 21, thereby more beneficial to improve the heat management effect.

[0168] In some embodiments of the present application, the frame 1022 and / or the cross beam 1023 are made of aluminum material.

[0169] The aluminum material is light in weight and low in cost, which is beneficial to suppress the cost investment of the battery device 100.

[0170] In some embodiments of the present application, the bottom plate 1021 comprises a heat exchange plate 2.

[0171] For example, the heat exchange plate 2 can be used as the bottom plate 1021, or the heat exchange plate 2 and at least one other plate can be integrated as a whole and used as the bottom plate 1021.

[0172] In this way, the heat exchange plate 2 is used as at least part of the bottom plate 1021, which is beneficial to save space and improve the volume energy density of the battery device 100.

[0173] In some embodiments of the present application, the first plate 21 comprises a metal plate; and / or, the second plate 22 comprises a non-metal plate.

[0174] The first plate 21 comprises a metal plate, so that the first plate 21 has a high thermal conductivity and can efficiently exchange heat with the battery monomer 1, thereby well managing the temperature of the battery monomer 1. The second plate 22 comprises a non-metal plate, so that the second plate 22 has a low thermal conductivity and the heat exchange performance of the second plate 22 with the components on the side away from the first plate 21 is poor, thereby reducing the waste of heat energy or cold energy of the heat exchange medium, improving the utilization rate of the heat energy or cold energy of the heat exchange medium, and improving the efficiency of temperature control of the battery monomer 1, thereby improving the heat management capability of the battery device 100.

[0175] In some embodiments of the present application, the first plate 21 comprises an aluminum plate.

[0176] Aluminum material is light in weight, low in cost and high in thermal conductivity, which is beneficial to improve heat exchange efficiency and reduce cost input.

[0177] In some embodiments of the present application, the second plate 22 comprises a plurality of layers of continuous fiber composite material arranged in layers, each layer of continuous fiber composite material comprising continuous fibers and a thermoplastic resin matrix connecting the continuous fibers.

[0178] The composite material formed by the continuous fibers and the thermoplastic resin matrix can be made into the second plate 22 by molding, which has good shape retention after processing and is not prone to warping deformation, and can be well fitted with the first plate 21. Moreover, the composite material formed by the continuous fibers and the thermoplastic resin matrix has the characteristics of high strength, high rigidity and high toughness, which helps to improve the structural strength and structural rigidity of the second plate 22. In addition, the composite material has very high specific rigidity, and the minimum wall thickness of the second plate 22 is not limited by the process, and compared with injection molding, a smaller wall thickness can meet the rigidity requirement, so as to achieve the purpose of weight reduction.

[0179] In some embodiments of the present application, the plurality of layers of continuous fiber composite material arranged in layers are combined to form a continuous fiber composite plate, and the continuous fiber composite plate is formed into the second plate 22 by molding.

[0180] In the above technical solution, the plurality of layers of continuous fiber composite material are first combined to form a continuous fiber composite plate, and the continuous fiber composite plate is then formed into the second plate 22 by molding. The molding process can more accurately ensure the shape and size precision of the second plate 22, so as to as far as possible ensure the mechanical properties and structural integrity of the second plate 22.

[0181] In some embodiments of the present application, the thermoplastic resin matrix comprises a polyamide unit, and in the polyamide unit, the ratio of the number of carbons on the main carbon chain of the polyamide unit to the number of amide groups is not less than 8.

[0182] In some embodiments, the ratio of the number of carbons on the main carbon chain of the polyamide unit to the number of amide groups is 8-15, i.e. the ratio of the number of carbons on the main carbon chain of the polyamide unit to the number of amide groups can be 8, 9, 10, 11, 12, 13, 14, 15, etc.

[0183] It can be understood that the ratio of the number of carbons on the main carbon chain of the polyamide unit to the number of amide groups not less than 8 means that the ratio of the number of carbons on the main carbon chain of all polyamide units of the thermoplastic resin matrix to the number of amide groups is not less than 8.

[0184] Thus, by controlling the ratio of the number of carbons to the number of amide groups in the individual structural units of the thermoplastic resin matrix, the number of CHx groups (methyl and methylene groups) in the individual polyamide units can be controlled, so as to ensure the strength of the single-layer continuous fiber composite layer while ensuring the breaking elongation of the single-layer continuous fiber composite layer, so that the continuous fiber composite layer can meet the requirements of high strength and high breaking elongation.

[0185] In some embodiments of the present application, the polyamide includes any one or a combination of PA610, PA11, PA12, PA1212, PA1012, and PA1313.

[0186] In some embodiments of the present application, the continuous fiber includes one of an organic fiber and an inorganic fiber.

[0187] The organic fiber has high strength, good elasticity, and flexibility. The inorganic fiber has high strength and modulus. By matching one or a combination of the organic fiber and the inorganic fiber with the thermoplastic resin, the strength of the single-layer continuous fiber composite layer can be improved, thereby improving the strength of the second plate 22.

[0188] In some embodiments of the present application, the inorganic fiber includes any one of glass fiber, aramid fiber, or boron fiber.

[0189] In some embodiments of the present application, the organic fiber includes any one of aramid fiber and ultrahigh molecular weight polyethylene fiber.

[0190] In some embodiments of the present application, the weight fraction of the continuous fiber is 60-80, the weight fraction of the thermoplastic resin matrix is 20-40, and the sum of the weight fraction of the continuous fiber and the weight fraction of the thermoplastic resin matrix is 100.

[0191] By controlling the content of the continuous fiber and the thermoplastic resin matrix within a reasonable range, the probability of the continuous fiber leaking out due to the continuous fiber content being too high and the resin matrix content being too low can be reduced, and the probability of the composite material not being strong enough due to the continuous fiber content being too low and the resin matrix content being too high can also be reduced, i.e., the content of the continuous fiber and the content of the thermoplastic resin matrix are balanced, so that the performance of the composite material is suitable for making the second plate 22.

[0192] In some embodiments, the continuous fiber composite layer includes 68-75 parts by weight of continuous fiber and 25-32 parts by weight of thermoplastic resin matrix. Thus, the content of the continuous fiber and the content of the thermoplastic resin matrix are further limited, so as to achieve a more balanced state.

[0193] In some embodiments of the present application, the first plate 21 and the second plate 22 are bonded by the second adhesive layer.

[0194] Exemplarily, the material of the second adhesive layer can be any one of acrylic-acrylate copolymer, butadiene-styrene copolymer, styrene-acrylic acid copolymer, styrene-acrylate copolymer, ethylene-vinyl acetate copolymer, acrylic acid grafted polyethylene, maleic anhydride grafted polyethylene, acrylic acid grafted polypropylene, maleic anhydride grafted polypropylene, polyvinylidene fluoride, carboxymethyl cellulose, polyimide, polyetherimide, polyethylene terephthalate, ethylene-vinyl acetate copolymer bisphenol A type epoxy resin, ethylene-vinyl acetate copolymer bisphenol F type epoxy resin, glycerol ether type epoxy resin, glycerol ester type epoxy resin, silicone type resin, polyurethane, and styrene-isoprene-styrene copolymer.

[0195] The first plate 21 and the second plate 22 are connected by bonding, which is conducive to improving the sealing performance at the connection interface of the two, thereby reducing the probability of leakage of the heat exchange medium from the flow channel 20, and further improving the heat management effect. Moreover, the bonding process reduces the risk of heavy metal pollution caused by brazing.

[0196] In some embodiments of the present application, the glass transition temperature of the second adhesive layer is greater than 60°C; and / or, the tensile strength of the body of the second adhesive layer is greater than 15 MPa; and / or, the shear strength of the second adhesive layer at room temperature is greater than 15 MPa; and / or, the shear strength of the second adhesive layer at 80°C and -40°C is greater than 10 MPa.

[0197] After aging test of the second adhesive layer under the condition of ambient temperature of 85°C and humidity of 85%, the strength retention of the second adhesive layer is 80% after 1000 hours of test. After cyclic test between high temperature (80°C-120°C) and low temperature (-20°C- -40°C), the strength retention is 80% after 1000 cycles. The second adhesive layer has no obvious swelling after ethylene glycol immersion for 24 hours.

[0198] Exemplarily, the adhesive material of the second adhesive layer can be, but is not limited to, epoxy glue EP200.

[0199] In this way, using the adhesive material with such characteristics, the bonding between the first plate 21 and the second plate 22 is firm and long-lasting, which is conducive to prolonging the service life of the heat exchange plate 2 and further improving the heat management effect.

[0200] In some embodiments of the present application, as Figure 7 , Figure 8 , Figure 11 and Figure 12As shown, the first plate 21 is a flat plate, and a portion of the second plate 22 is recessed towards a side away from the first plate 21 to form a groove 223 extending along a curve, and the first plate 21 is stacked on the side of the groove 223 of the second plate 22 to form the flow channel 20.

[0201] By setting the first plate 21 as a flat plate, the first plate 21 can be in more sufficient contact with the battery monomer 1. The second plate 22 is provided with the groove 223, so that the second plate 22 and the first plate 21 are stacked to form the flow channel 20 for the heat exchange medium to flow, thereby realizing the heat exchange function of the heat exchange plate 2.

[0202] The second aspect of the present application provides a power consumption device comprising the battery device 100 provided by the first aspect, and the battery device 100 is used for storing or providing electric energy.

[0203] Since the battery device 100 has good heat management capability, the power consumption device comprising the battery device 100 also has good heat management capability.

[0204] Figure 13 A schematic diagram of an exploded structure of a vehicle according to one or more embodiments.

[0205] As Figure 13 As shown, the third aspect of the present application provides a vehicle 1000 comprising a chassis 400, a vehicle body 500 arranged on the chassis 400, and the battery device 100 provided by the first aspect arranged on the chassis 400.

[0206] Since the battery device 100 has good heat management capability, the vehicle 1000 comprising the battery device 100 also has good heat management capability.

[0207] In some embodiments of the present application, the vehicle body 500 and the chassis 400 jointly form a passenger compartment of the vehicle 1000, and the battery box 10 of the battery device 100 forms a floor of the passenger compartment.

[0208] By integrating the battery device 100 into the floor of the passenger compartment, additional supports and connecting members can be reduced, which helps to reduce the weight of the vehicle 1000, and the internal space of the vehicle 1000 can be more effectively utilized.

[0209] In some embodiments of the present application, the vehicle body 500 is arranged above the chassis 400 and detachably connected with the chassis 400.

[0210] The chassis 400 can be a slide chassis, and the vehicle body 500 is detachably connected with the slide chassis through a plurality of bolts along a circumference of the vehicle body structure.

[0211] In this way, the separation and decoupling of the vehicle body 500 and the chassis 400 is achieved, so that the vehicle body 500 can be replaced according to requirements, the development cycle is shortened, and the cost is reduced. In other words, the integration of the chassis 400 is improved, and a plurality of vehicle models can be adapted.

[0212] In the following, specific examples of some embodiments of the present application will be described with reference to the accompanying drawings.

[0213] As a specific example, a battery pack (battery device 100) includes a water-cooled plate (heat exchange plate 2) as a bottom plate (bottom plate 1021) of a battery box (battery box 10), the upper plate (first plate 21) of the water-cooled plate is a flat plate made of aluminum material, the lower plate (second plate 22) is made of continuous fiber composite material, the lower plate is formed by mold pressing, has a winding recess (recess 223), and the upper plate and the lower plate are bonded by glue to form a closed flow channel (flow channel 20). The continuous fiber composite material is formed by mold pressing, has good shape retention and is not easy to warp and deform, can be well fitted with the upper plate made of aluminum, and at the same time, the continuous fiber composite material has very high specific stiffness, and the minimum wall thickness of the lower plate is not limited by the process. Compared with injection molding, a smaller wall thickness can meet the stiffness requirement, thereby achieving the purpose of weight reduction.

[0214] In addition, by making the outer dimension of the upper plate smaller, the periphery of the upper plate has a gap with the frame (frame 1022). By adding a protruding structure (pad 23) on the lower plate, the upper end of the protruding structure abuts against the cross beam (cross beam 1023), so that the upper surface of the upper plate has a gap with the lower surface of the cross beam, and the upper plate does not contact the frame and the cross beam, thereby reducing the heat conduction loss and improving the heat management efficiency.

[0215] In some embodiments, the elastic modulus of each layer of continuous fiber composite material layer is 34GPa-40GPa, the tensile strength of each layer of continuous fiber composite material layer is 918MPa-1300MPa, and the elongation at break of each layer of continuous fiber composite material layer is 3%-6%. That is, 34GPa≤elastic modulus of continuous fiber composite material layer≤40GPa, 918MPa≤tensile strength of continuous fiber composite material layer≤1300MPa, and 3%≤elongation at break of continuous fiber composite material layer≤6%. In this way, the range of the elastic modulus and the tensile strength of the continuous fiber composite material layer is further limited.

[0216] It should be noted that the elongation at break refers to the percentage of the elongation of the original gauge length to the original gauge length after tensile fracture of the sample.

[0217] As for the detection means of the elongation at break of the continuous fiber composite layer, a part of the second plate 22 can be cut as a sample, the continuous fiber composite layer of the sample can be separated, and a test piece can be made for the single-layer continuous fiber composite layer, and the test piece can be placed on a tensile testing machine for testing.

[0218] The width of the test piece is usually 50 mm, and the gauge length of the test piece is 100 mm. A tensile force is applied to the test piece at a constant speed until the test piece breaks. The maximum elongation at break is recorded, and the ratio to the gauge length is calculated to obtain the elongation at break. The test environment conditions: the test should be carried out under standard environmental conditions, usually room temperature (23±2℃), relative humidity 50%±5%.

[0219] In some embodiments of the present application, the continuous fibers are continuous glass fibers. The thermoplastic resin matrix is polyamide. The composite material formed by the combination of continuous glass fibers and polyamide has the characteristics of high strength and high modulus of continuous glass fibers and good processability and recyclability of polyamide, which helps to improve the tensile strength and elongation at break of the single-layer continuous fiber composite layer, and the polyamide matrix is easy to form.

[0220] The components and experimental data of some embodiments are introduced below in combination with Table 1.

[0221] Table 1 is experimental data of the continuous fiber composite layer including glass fibers and a polyamide resin matrix provided by embodiments of the present application

[0222]

[0223]

[0224] Compatibilizer: high-melt-index P0E grafted maleic anhydride (Kao Attichem Co., Ltd.).

[0225] Glass fiber refers to continuous glass fiber, and the grade is E7DR17-1200-352C (China Jushi Co., Ltd.).

[0226] Antioxidant: RIANOX 1098 (i.e., antioxidant 1098), PEP-36. (Tianjin Li'an Long New Material Co., Ltd.).

[0227] PA610 refers to polyamide 610; PA11 refers to polyamide 11; and PA12 refers to polyamide 12. (Toray Industries, Inc.).

[0228] The components and experimental data of some comparative examples are introduced below in combination with Table 2.

[0229] Table 2 is the components and experimental data of some comparative examples

[0230]

[0231]

[0232] PA6 is polyamide 6; PA66 is polyamide 66. (Hangzhou Gonghe New Material Co., Ltd.).

[0233] It should be noted that the comparative examples refer to test data that do not meet the requirements of the examples of the present application.

[0234] From Tables 1 and 2, the molecular formula of PA610 is (-NH-(CH2)5-CO-) n In the single structural unit of PA610, the number of carbons in the main carbon chain is 8, and the number of amide groups is 1, i.e. the ratio of the number of carbons in the main carbon chain to the number of amide groups is 8.

[0235] The molecular formula of PA11 is H(NH(CH2) 10 CO) n OH, in the single structural unit of PA11, the number of carbons in the main carbon chain is 11, and the number of amide groups is 1, i.e. the ratio of the number of carbons in the main carbon chain to the number of amide groups in the single structural unit of PA11 is 11.

[0236] The molecular formula of PA12 is -(NH-(CH2) 11 -CO) n - in the single structural unit of PA12, the number of carbons in the main carbon chain is 12, and the number of amide groups is 1, i.e. the ratio of the number of carbons in the main carbon chain to the number of amide groups in the single structural unit of PA12 is 12.

[0237] The molecular formula of PA6 is (-NH-(CH2)5-CO) n In the single structural unit of PA6, the number of carbons in the main carbon chain is 6, and the number of amide groups is 1, i.e. the ratio of the number of carbons in the main carbon chain to the number of amide groups in the single structural unit of PA6 is 6.

[0238] The molecular formula of PA66 is (-NH(CH2)6-NHCO(CH2)4CO) n In the single structural unit of PA66, the number of carbons in the main carbon chain is 12, and the number of amide groups is 2, i.e. the ratio of the number of carbons in the main carbon chain to the number of amide groups in the single structural unit of PA66 is 6.

[0239] It should be noted that the polyamide is a polymer polymerized by multiple repeating structural units, two structural units are polymerized by -CO- and -NH-, therefore, when calculating the number of amide groups, -CO- and -NH2- in a single structural unit are counted as one amide group, and whether -CO- and -NH2- in a single structural unit are connected together is not concerned.

[0240] It should be noted that the resin matrix in Comparative Example 6 includes 23 parts by weight of PA6 and 12 parts by weight of PA610, the number of carbons on the main carbon chain of PA6 and the number of amide groups are 6, and therefore mixing 23 parts by weight of PA6 and 12 parts by weight of PA610 will result in that the average of the ratio of the number of carbons on the main carbon chain to the number of amide groups is less than 8.

[0241] The resin matrix in Comparative Example 7 includes 23 parts by weight of PA66 and 12 parts by weight of PA610, the number of carbons on the main carbon chain of PA66 and the number of amide groups are 6, and therefore mixing 23 parts by weight of PA66 and 12 parts by weight of PA610 will result in that the average of the ratio of the number of carbons on the main carbon chain to the number of amide groups is less than 8.

[0242] The polyamide in Examples 1 to 9 uses one or more of PA610, PA11, and PA12 in combination, all of which meet the requirement that the ratio of the number of carbons on the main carbon chain of the polyamide unit to the number of amide groups is in the range of 8 to 15. The weight parts of the thermoplastic resin matrix in Examples 1 to 9 are 33, 33, 33, 32, 28, 23, 33, 33, and 33 respectively, that is, the weight parts of the thermoplastic resin matrix are between 20 and 40.

[0243] The weight parts of the glass fiber in Examples 1 to 9 are 65, 65, 65, 65, 70, 75, 65, 65, and 65 respectively, that is, the weight parts of the continuous fiber are between 60 and 80.

[0244] The weight parts of the compatibilizer in Examples 1 to 9 are all 2, and the weight parts of the antioxidant are all 0.3 (0.1 part by weight of RIANOX 1098 and 0.2 part by weight of PEP-36).

[0245] In Embodiment 1 to Embodiment 9, the minimum value of the tensile strength of the formed continuous fiber composite layer is 1005 MPa, and the maximum value of the tensile strength is 1370 MPa. The minimum value of the elastic modulus of the formed continuous fiber composite layer is 39.5 GPa, and the maximum value is 43.5 GPa. The minimum value of the elongation at break of the formed continuous fiber composite layer is 3.12%, and the maximum value is 4.0%. The minimum value of the water absorption of the formed continuous fiber composite layer is 0.19%, and the maximum value is 0.3%. All meet the performance requirements of the continuous fiber composite layer in the embodiments of the present application.

[0246] It can be found from Embodiment 1, Embodiment 2 and Embodiment 3 that the higher the ratio of the number of carbons on the main carbon chain of a single structural unit to the number of amide groups, the higher the elongation at break, and the lower the water absorption.

[0247] It can be found from Embodiment 4, Embodiment 5 and Embodiment 6 that the higher the glass fiber content, the higher the tensile strength, but the lower the elongation at break. By comparing Embodiment 1 with Comparative Example 1, Embodiment 2 with Comparative Example 2, and Embodiment 7 with Comparative Example 7, it can be found that when the ratio of the number of carbons on the main carbon chain of a single structural unit to the number of amide groups is less than 8, the elongation at break of the continuous fiber composite layer is less than 3%, and the water absorption is also greater than 0.3%.

[0248] By comparing Embodiment 5, Embodiment 6 and Comparative Example 3, it can be found that when the weight part of glass fiber exceeds 80, the elongation at break of the continuous fiber composite layer is less than 3% and the performance requirements of the continuous fiber composite layer are not met.

[0249] By comparing Embodiment 1 and Comparative Example 5, it can be found that when the weight part of polyamide exceeds 40, the elongation at break of the continuous fiber composite layer is less than 3%, the water absorption is greater than 0.3%, and the tensile strength is reduced. The performance requirements of the continuous fiber composite layer are not met.

[0250] The above embodiments are only used to illustrate the technical solutions of the present application, but 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 they can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some 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 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.

Claims

1. A battery device, characterized in that, include: At least one battery cell; The heat exchange plate includes a first plate and a second plate stacked on top of each other, with a flow channel formed between the first plate and the second plate for the flow of heat exchange medium. The first plate is disposed close to the battery cell, and the second plate is disposed on the side of the first plate facing away from the battery cell. The thermal conductivity of the first plate is higher than that of the second plate.

2. The battery device according to claim 1, characterized in that, The battery device further includes a battery case, which includes a case body and a cover covering the case body, with a space between the cover and the case body for accommodating the individual battery cells. The second plate is disposed on the housing, and the first plate is disposed on the side of the second plate facing the housing cover, and the battery cell is in contact with the first plate.

3. The battery device according to claim 2, characterized in that, The enclosure includes a base plate and a frame surrounding the base plate, with a receiving groove formed between the base plate and the frame. The edge of the frame away from the base plate forms an opening in the receiving groove, and the enclosure lid covers the receiving groove to form the receiving space. The second plate is connected to the frame, and the first plate is located on the side of the second plate facing away from the bottom plate. There is a gap between the first plate and the frame.

4. The battery device according to claim 3, characterized in that, The second plate includes an overlapping portion and a protruding portion surrounding the outer periphery of the overlapping portion. When projected in a direction perpendicular to the first plate, the orthographic projection of the overlapping portion coincides with the orthographic projection of the first plate, and there is no overlap between the orthographic projection of the protruding portion and the orthographic projection of the first plate. The protruding portion is connected to the frame, and there is a gap between the outer peripheral edge of the first plate and the surface of the frame facing the receiving groove.

5. The battery device according to claim 4, characterized in that, The surface of the extended portion facing the lid and the surface of the frame facing away from the lid are bonded together by a first adhesive layer; and / or The extended portion is connected to the surface of the frame facing away from the lid by a first fastener.

6. The battery device according to any one of claims 3 to 5, characterized in that, The housing also includes a crossbeam connected to the frame. The crossbeam is located on the side of the first plate facing away from the second plate and is located between adjacent battery cells. There is a gap between the first plate and the crossbeam.

7. The battery device according to claim 6, characterized in that, The first plate has through holes. The second plate is provided with a pad, which protrudes towards the crossbeam relative to the surface of the second plate that is in contact with the first plate. The pad passes through the through hole and abuts against the crossbeam. The thermal conductivity of the pad is lower than that of the first plate.

8. The battery device according to claim 7, characterized in that, The pad and the second plate are formed as an integral structure.

9. The battery device according to claim 7, characterized in that, The pad and the second plate are separate structures.

10. The battery device according to any one of claims 7 to 9, characterized in that, The pad and the second plate may be made of the same or different materials.

11. The battery device according to any one of claims 7 to 9, characterized in that, The second plate, the pad, and the crossbeam are connected by a second fastener, which includes a rivet nut.

12. The battery device according to any one of claims 7 to 9, characterized in that, The two opposite ends of the crossbeam are respectively connected to the frame.

13. The battery device according to any one of claims 7 to 9, characterized in that, The frame and / or the crossbeam are made of aluminum.

14. The battery device according to any one of claims 3 to 5, 7 to 9, characterized in that, The base plate includes the heat exchange plate.

15. The battery device according to any one of claims 1 to 5, 7 to 9, characterized in that, The first plate comprises a metal plate; and / or the second plate comprises a non-metal plate.

16. The battery device according to claim 6, characterized in that, The first plate comprises a metal plate; and / or the second plate comprises a non-metal plate.

17. The battery device according to any one of claims 1 to 5, 7 to 9 and 16, characterized in that, The first plate includes an aluminum plate.

18. The battery device according to any one of claims 1 to 5, 7 to 9 and 16, characterized in that, The second plate includes multiple layers of continuous fiber composite material, each layer of which includes continuous fibers and a thermoplastic resin matrix, wherein the thermoplastic resin matrix connects the continuous fibers.

19. The battery device according to claim 18, characterized in that, The multi-layered continuous fiber composite material is laminated to form a continuous fiber composite board, and the continuous fiber composite board is molded to form the second board.

20. The battery device according to claim 19, characterized in that, The continuous fiber is either an organic fiber or an inorganic fiber.

21. The battery device according to claim 20, characterized in that, The inorganic fiber is any one of glass fiber, aramid fiber, or boron fiber; and / or, the organic fiber is any one of aromatic polyamide fiber or ultra-high molecular weight polyethylene fiber.

22. The battery device according to any one of claims 1 to 5, 7 to 9, 16, 19 to 21, characterized in that, The first plate and the second plate are bonded together by a second adhesive layer.

23. The battery device according to claim 22, characterized in that, The glass transition temperature of the second adhesive layer is greater than 60°C; and / or The tensile strength of the second adhesive layer is greater than 15 MPa; and / or The second adhesive layer has a room temperature shear strength greater than 15 MPa; and / or The second adhesive layer has a shear strength greater than 10 MPa at 80°C and -40°C.

24. The battery device according to any one of claims 1 to 5, 7 to 9, 16, 19 to 21 and 23, characterized in that, The first plate is a flat plate, and a portion of the second plate is recessed toward the side away from the first plate to form a groove extending along a curve. The first plate is stacked on the groove side of the second plate to form the flow channel.

25. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1 to 24, wherein the battery device is used to store or provide electrical energy.

26. A vehicle, characterized in that, It includes a chassis, a vehicle body mounted on the chassis, and a battery device mounted on the chassis as described in any one of claims 1 to 24.

27. The vehicle according to claim 26, characterized in that, The vehicle body and the chassis together form the passenger compartment of the vehicle, and the battery box of the battery device forms the floor of the passenger compartment.

28. The vehicle according to claim 26, characterized in that, The vehicle body is located above the chassis and is detachably connected to the chassis.

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