Heat exchange assembly and flexible part, rigid part, battery device and electric equipment thereof

Abstract

The embodiment of the utility model provides a heat exchange assembly and a flexible part, a rigid part, a battery device and electric equipment thereof. The battery device comprises a box body, a plurality of battery monomers and a heat exchange assembly, the plurality of battery monomers are arranged in the box body, the heat exchange assembly comprises at least two heat exchange pieces, at least one heat exchange piece is arranged as a flexible piece, at least one heat exchange piece is arranged as a rigid piece, the flexible piece and the rigid piece are stacked to form at least one medium flow channel, the heat exchange assembly comprises a hot melting layer, the hot melting layer is connected with the rigid piece and the flexible piece, and the hot melting layer is arranged between the rigid piece and the flexible piece. An exhaust structure is formed at the joint of the hot melting layer and the rigid part and / or the joint of the hot melting layer and the flexible part. In the battery device provided by the embodiment of the invention, the rigid part and the flexible part are connected through the hot melting layer, and the exhaust structure is formed at the joint of the hot melting layer and the flexible part and / or the joint of the hot melting layer and the rigid part, so that the probability of bubbles in the hot melting layer can be reduced, the connection strength can be improved, and the risk of heat exchange medium leakage can be reduced.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of batteries, and in particular, to a heat exchange component, its flexible member, rigid member, battery device, and electrical equipment. Background Art

[0002] In new energy vehicles equipped with battery devices, the battery devices can be used to provide power in whole or in part. During the use of the battery device, the battery cells in the battery device will generate heat. If this heat is too high, it will have an adverse impact on the performance and service life of the battery device. Therefore, a cold plate is usually provided in the battery device. There is a problem of poor connection strength at the joints of various parts in the cold plate of the related art, resulting in a risk of leakage of the heat exchange medium in the cold plate. Summary of the Utility Model

[0003] In view of this, embodiments of the present application are expected to provide a heat exchange component, its rigid member and flexible member, battery device, and electrical equipment.

[0004] The first aspect of the embodiments of the present application provides a battery device, the battery device includes: a box body; a plurality of battery cells, the plurality of battery cells are arranged in the box body; a heat exchange component, the heat exchange component includes at least two heat exchange members, at least one of the heat exchange members is arranged as a flexible member, at least one of the heat exchange members is arranged as a rigid member, the flexible member and the rigid member are stacked to form at least one medium flow channel, the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells; wherein, the heat exchange component includes a hot melt layer, the hot melt layer connects the rigid member and the flexible member, and an exhaust structure is formed at the connection between the hot melt layer and the rigid member and / or at the connection between the hot melt layer and the flexible member.

[0005] In the battery device provided by the embodiment of the present application, at least one heat exchanger of the heat exchange assembly is set as a flexible member, and the weight of the flexible member is relatively light, which is conducive to reducing the weight of the heat exchange assembly, thereby improving the energy density of the battery device. On the other hand, the flexible member has a certain flexibility, which can make the heat exchange assembly fit better with the box and / or the battery cell, thereby absorbing the assembly tolerance of the heat exchange assembly, without the need to use a caulking agent or a heat conductive material, improving the fit between the heat exchange assembly and the box and / or the battery cell, and increasing the effective heat exchange area between the heat exchange assembly and the box and / or the battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly. On the other hand, by setting at least one heat exchanger as a rigid member, the flexible member and the rigid member are stacked to form at least one medium flow channel, and the rigid member can support the flexible member, which is conducive to improving the overall structural strength and stability of the heat exchange assembly, and further improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly; in addition, by setting a rigid member, the heat exchange assembly has sufficient structural strength for carrying the battery cell, thereby improving the applicability of the heat exchange assembly. On the other hand, the rigid parts and the flexible parts are connected by a hot melt layer, and the temperature during connection (150℃±10℃) is lower than the brazing temperature in the related art, and the alloy elements will not precipitate, which is beneficial to further improve the structural strength of the heat exchange component. In addition, an exhaust structure is formed at the connection between the hot melt layer and the flexible part and / or the connection between the hot melt layer and the rigid part, which can reduce the probability of bubbles appearing in the hot melt layer, thereby improving the connection strength between the flexible part and the rigid part, reducing the risk of leakage of the heat exchange medium, and improving reliability.

[0006] In some embodiments, the exhaust structure includes a first exhaust groove, and a side surface of the hot melt layer facing the rigid component and / or a side surface of the hot melt layer facing the flexible component is partially recessed to form the first exhaust groove.

[0007] In this embodiment, by forming a first exhaust groove by making the surface of the hot melt layer concave, on the one hand, the manufacturing cost can be reduced while achieving exhaust, and on the other hand, the integrity of the connection interface after the actual connection is completed can be improved as much as possible (making the first exhaust groove basically disappear), thereby further improving the connection strength.

[0008] In some embodiments, at least a portion of the first exhaust groove extends to the medium flow channel.

[0009] In this embodiment, by extending at least a portion of the first exhaust groove to the medium flow channel, exhaust can be performed through the medium flow channel, thereby improving exhaust efficiency and reducing bubble generation rate.

[0010] In some embodiments, at least a portion of the first exhaust slot extends to an outer periphery of the heat exchange component.

[0011] In this embodiment, by extending at least a part of the first exhaust groove to the outer peripheral edge of the hot melt layer, gas can be discharged into the external environment, thereby improving the exhaust efficiency and reducing the occurrence rate of bubbles.

[0012] In some embodiments, the extending direction of at least a part of the first exhaust groove intersects with the extending direction of the medium flow channel.

[0013] In this embodiment, by making the extending direction of at least a part of the first exhaust groove intersect with the extending direction of the medium flow channel, the exhaust path of this part of the first exhaust groove can be shortened as much as possible, thereby further improving the exhaust efficiency and reducing the occurrence rate of bubbles.

[0014] In some embodiments, along the lamination direction of the flexible member and the rigid member, the size of the first exhaust groove is smaller than the size of the hot melt layer.

[0015] In this embodiment, in the lamination direction, the first exhaust groove does not penetrate the hot melt layer. In this way, the uniformity of the thickness at the position where the first exhaust groove is provided and the position where the first exhaust groove is not provided in the hot melt layer after the actual connection is completed can be improved, thereby further improving the connection strength.

[0016] In some embodiments, the rigid member and the flexible member form a plurality of hot pressing regions, the hot melt layer is disposed in the hot pressing regions, the plurality of hot pressing regions divide the heat exchange assembly to form the medium flow channel, and the first exhaust groove is provided in each of the hot pressing regions.

[0017] In this embodiment, by providing the first exhaust groove in each of the hot pressing regions, it helps to enable each hot pressing region to exhaust more fully, thereby further reducing the occurrence rate of bubbles.

[0018] In some embodiments, the exhaust structure includes a second exhaust groove, the second exhaust groove is formed on the side of the rigid member facing the hot melt layer, the second exhaust groove extends to the outer peripheral edge of the heat exchange assembly, and the second exhaust groove forms a gap with the medium flow channel.

[0019] In this embodiment, the rigid member forms the second exhaust groove to achieve exhaust. At the same time, the hot melt layer will at least partially fill the second exhaust groove after the connection is completed. In this way, it helps to further improve the connection strength between the hot melt layer and the rigid member.

[0020] In some embodiments, the exhaust structure includes a first exhaust groove, the first exhaust groove is formed by partial depression on the surface of the hot melt layer facing the rigid member, the exhaust cross-sectional area of the second exhaust groove is larger than the exhaust cross-sectional area of the first exhaust groove, and the exhaust cross-sectional area is the area of the cross-section perpendicular to the exhaust direction.

[0021] In this embodiment, by simultaneously providing the first exhaust groove and the second exhaust groove, and making the exhaust cross-sectional area of the second exhaust groove larger than that of the first exhaust groove, on the one hand, the exhaust sufficiency can be further improved and the occurrence rate of bubbles can be reduced. On the other hand, the number of the second exhaust grooves provided on the rigid member can be reduced, which helps to reduce the cost and improve the structural strength of the rigid member.

[0022] In some embodiments, the rigid member and the flexible member form a plurality of hot pressing areas, the hot melting layer is disposed in the hot pressing areas, the plurality of hot pressing areas separate the heat exchange assembly to form the medium flow channel, the second exhaust groove is disposed in a first area of the plurality of hot pressing areas, and the first area is a hot pressing area where the distance between two relatively arranged boundaries is greater than or equal to 50 mm, and / or the first area is a hot pressing area with an area greater than or equal to 500 mm².

[0023] In this embodiment, the second exhaust groove is additionally provided in the hot pressing area (the first area) with a larger area and / or weld width, so as to ensure the exhaust sufficiency of the first area. At the same time, the number of the second exhaust grooves provided on the rigid member is further reduced, which helps to improve the structural strength of the rigid member.

[0024] In some embodiments, the flexible member includes a metal plasticized film.

[0025] In this embodiment, because the metal plasticized film is thin and light in weight, and a medium flow channel is formed between the metal plasticized film and the heat exchange member, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange assembly can be reduced.

[0026] In some embodiments, the flexible member includes an aluminum plastic film.

[0027] The aluminum plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation.

[0028] In some embodiments, the flexible member is a layered structure, the flexible member includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0029] In this embodiment, the flexible member formed by sequentially stacking the metal layer and the non-metal layer is thin and light in weight, and it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange assembly can be reduced. In addition, the heat exchange assembly will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0030] In some embodiments, the metal layer includes one of aluminum foil, copper foil, and steel foil; and / or, the non-metal layer includes one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0031] By setting the metal layer as one of aluminum foil, copper foil, and steel foil, the flexible member can have a certain structural strength and can play an isolation role. By setting the non-metal layer as one of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible member can have a certain waterproof function.

[0032] In some embodiments, the thickness of the flexible member is 0.05 mm - 0.3 mm.

[0033] In this embodiment, by setting the thickness of the flexible member to 0.05 mm - 0.3 mm, the heat exchange component made of the flexible member has a certain structural strength while the overall thickness of the heat exchange component is relatively small, which is beneficial to reducing the overall volume and weight of the battery device to increase the energy density of the battery device.

[0034] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa - 10000 MPa.

[0035] In this embodiment, by setting the elastic modulus of the flexible member to 0.1 MPa - 10000 MPa, the flexible member not only has a certain structural strength to improve the reliability of the heat exchange component, but also has a certain deformation ability, which can enhance the fitting degree between the heat exchange component and the box body and / or the battery cell, thereby increasing the effective heat exchange area between the heat exchange component and the box body and / or the battery cell, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0036] In some embodiments, the rigid member is set as a metal plate.

[0037] In this embodiment, by setting the rigid member as a metal plate, the metal plate can still have good structural strength while forming the above-mentioned matte layer and / or textured layer, and has good heat conduction performance.

[0038] The second aspect of the embodiments of the present application provides a heat exchange component, which includes at least two heat exchange members, at least one of the heat exchange members is set as a flexible member, at least one of the heat exchange members is set as a rigid member, the flexible member and the rigid member are stacked to form at least one medium flow channel, the at least one medium flow channel is used to conduct a heat exchange medium, the heat exchange medium is used to exchange heat with the plurality of battery cells, wherein, the heat exchange component includes a hot melt layer, the hot melt layer connects the rigid member and the flexible member, and an exhaust structure is formed at the connection between the hot melt layer and the rigid member and / or at the connection between the hot melt layer and the flexible member.

[0039] In the third aspect of the embodiments of the present application, a flexible member is provided. The flexible member is used to form a medium flow channel of a heat exchange assembly. One side of the flexible member in the thickness direction has a hot melt layer, and an exhaust structure is formed by partial depression on the outer surface of the hot melt layer.

[0040] In the fourth aspect of the embodiments of the present application, a rigid member is provided. The rigid member is used to form a medium flow channel of a heat exchange assembly. The rigid member has a connection surface for contacting the hot melt layer, and an exhaust structure is formed by partial depression on the connection surface.

[0041] In the fifth aspect of the embodiments of the present application, an electrical device is provided. The electrical device includes the battery device described in the first aspect of the embodiments of the present application, or the heat exchange assembly described in the second aspect of the embodiments of the present application.

[0042] The heat exchange assembly, flexible member, rigid member, hot pressing head, and electrical device in the embodiments of the present application have all the advantages of the battery device described in any one of the above embodiments, which will not be elaborated here.

[0043] In the sixth aspect of the embodiments of the present application, a hot pressing head is provided. The hot pressing head is used to produce a heat exchange assembly. The heat exchange assembly includes at least two heat exchange members. At least one of the heat exchange members is arranged as a flexible member, and at least one of the heat exchange members is arranged as a rigid member. The flexible member and the rigid member are stacked to form at least one medium flow channel. The heat exchange assembly includes a hot melt layer. The hot melt layer connects the rigid member and the flexible member, and an exhaust structure is formed at the connection between the hot melt layer and the rigid member and / or at the connection between the hot melt layer and the flexible member. The hot pressing head has a hot pressing surface. Along the exhaust direction of the exhaust structure, the hot pressing surface is formed as an arc surface with a middle convexity.

[0044] In this embodiment, the hot pressing surface of the hot pressing head is set to be an arc surface with a middle convexity along the exhaust direction of the exhaust structure. In this way, the middle convex part of the hot pressing surface will contact the rigid member / flexible member first, and the parts on both sides will contact the rigid member / flexible member later. In this way, it will be able to force the air flow to flow from the middle part to both sides, that is, along the exhaust direction, thereby helping to further improve the exhaust effect. Description of the Drawings

[0045] Figure 1 It is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0046] Figure 2 It is a three-dimensional exploded view of a battery device provided by an embodiment of the present application;

[0047] Figure 3 It is a three-dimensional exploded view of a heat exchange assembly provided by an embodiment of the present application;

[0048] Figure 4 Schematic diagram of the flexible member and the hot melt layer provided by an embodiment of the present application;

[0049] Figure 5 is Figure 4 An enlarged schematic diagram of part A in

[0050] Figure 6 Schematic diagram of the welding layer of an embodiment of the present application;

[0051] Figure 7 Schematic diagram of the rigid member of an embodiment of the present application;

[0052] Figure 8 Schematic diagram of the hot pressing head of an embodiment of the present application.

[0053] Description of reference numerals

[0054] 1000, vehicle; 100, battery device; 10, battery cell; 20, box body; 21, box main body; 211, side beam; 22, top cover; 23, bottom guard plate; 30, heat exchange component; 30a, medium flow channel; 30b, inlet; 30c, outlet; 30d, hot pressing area; 31, flexible member; 32, rigid member; 33, connecting member; 34, hot melt layer; 35, exhaust structure; 35a, first exhaust groove; 35b, second exhaust groove; 200, controller; 300, motor; 2000, hot pressing head; 2000a, hot pressing surface. Detailed implementation manners

[0055] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0056] In the various specific technical features described in the specific embodiments, without conflict, they can be combined in any suitable manner. For example, different embodiments and technical solutions can be formed by combining different specific technical features. To avoid unnecessary repetition, various possible combination manners of the specific technical features in the present application will not be described separately.

[0057] In the following descriptions, the terms "first / second / ..." involved are only used to distinguish different objects and do not indicate that there are the same or related relationships between the objects. It should be understood that the orientation descriptions "above", "below", "outside", "inside" involved are all the orientations in the normal use state, and the "left" and "right" directions represent the left and right directions shown in the specific corresponding schematic diagram, which may or may not be the left and right directions in the normal use state.

[0058] It should be noted that the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0059] In the description of the present application, the orientations or positional relationships of “first direction”, “second direction” and “height direction” are based on the orientations or positional relationships shown in the accompanying drawings, wherein the “first direction” is the direction indicated by the arrow L1 in the accompanying drawings, the “second direction” is the direction indicated by the arrow L2 in the accompanying drawings, and the “height direction” is the direction indicated by the arrow L3 in the accompanying drawings. It should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0060] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0061] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0062] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0063] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0064] Unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0065] With the development of clean energy, more and more devices use electric energy as the driving energy. As a result, power batteries that can store a large amount of electric energy and can be repeatedly charged and discharged have developed rapidly, such as lithium-ion batteries. Among them, power batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as multiple fields such as aerospace.

[0066] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use.

[0067] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this.

[0068] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting and at the same time allow active ions to pass through.

[0069] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0070] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0071] In some embodiments, the electrode assembly is a stacked structure.

[0072] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0073] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0074] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0075] As an example, a plurality of separators may be provided, which are respectively provided between any adjacent positive electrode plates or negative electrode plates.

[0076] As an example, the separators may be continuously provided and are provided between any adjacent positive electrode plates or negative electrode plates by folding or winding.

[0077] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, prismatic, etc.

[0078] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0079] In some embodiments, the battery cell may include a housing. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0080] As an example, the battery cell may 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-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc., and there is no special limitation in this application.

[0081] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap covers the opening. The housing body may be provided with one or more openings. One or more end caps may also be provided.

[0082] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab through a current collector member. The electrode terminal may be provided on the end cap or on the housing body.

[0083] During the use of a battery device, the battery cells within the battery device generate heat. If this heat is too high, it will have an adverse impact on the performance and service life of the battery device. Therefore, how to effectively dissipate the heat of the battery cells of the battery device while reducing the weight of the heat exchange component has become an important research direction in this field. In related technologies, a cooling system is arranged in the battery device box to cool the battery cells in the battery device. The above cooling system may include a plurality of aluminum water-cooled plates laid in the battery device box, and the surfaces of the plurality of water-cooled plates are in contact with the surfaces of the battery cells in the battery device. During use, for example, a heat exchange medium such as water flows through the above plurality of water-cooled plates, thereby taking away the heat on the battery cells and cooling the battery cells. However, the aluminum water-cooled plates in the above cooling system have problems of relatively large weight and poor use reliability.

[0084] In view of this, in order to reduce the weight of the heat exchange component and improve the use reliability, an embodiment of the present application provides a battery device, which includes a box body, a plurality of battery cells, and a heat exchange component. The plurality of battery cells are arranged in the box body. The heat exchange component includes at least two heat exchange members, at least one heat exchange member is arranged as a flexible member, and at least one heat exchange member is arranged as a rigid member. The flexible member and the rigid member are stacked to form at least one medium flow channel. At least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells. Among them, the heat exchange component includes a hot melt layer, the hot melt layer connects the rigid member and the flexible member, and an exhaust structure is formed at the connection between the hot melt layer and the rigid member and / or at the connection between the hot melt layer and the flexible member.

[0085] In the battery device provided by the embodiment of the present application, at least one heat exchange element of the heat exchange assembly is set as a flexible element. The flexible element has a light weight, which is beneficial to reducing the weight of the heat exchange assembly, and thus improving the energy density of the battery device. On the other hand, the flexible element has a certain flexibility, which can enable the heat exchange assembly to better fit with the box body and / or the battery cell, thereby facilitating the absorption of the assembly tolerance of the heat exchange assembly. There is no need to use caulking agents or thermal conductive materials, improving the fit degree between the heat exchange assembly and the box body and / or the battery cell, increasing the effective heat exchange area between the heat exchange assembly and the box body and / or the battery cell, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly. On the other hand, by setting at least one heat exchange element as a rigid element, the flexible element and the rigid element are stacked to form at least one medium flow channel. The rigid element can support the flexible element, which is beneficial to improving the overall structural strength and stability of the heat exchange assembly, and further improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly; in addition, by setting the rigid element, the heat exchange assembly has sufficient structural strength to carry the battery cell, improving the applicability of the heat exchange assembly. On the other hand, the rigid element and the flexible element are connected by a hot melt layer. The temperature during connection (150°C ± 10°C) is lower than the soldering temperature in the related art, and alloy elements will not precipitate, which is beneficial to further improving the structural strength of the heat exchange assembly. Moreover, an exhaust structure is formed at the connection between the hot melt layer and the flexible element and / or at the connection between the hot melt layer and the rigid element, which can reduce the probability of bubbles appearing in the hot melt layer, thereby improving the connection strength between the flexible element and the rigid element, reducing the risk of heat exchange medium leakage, and improving the use reliability.

[0086] The technical solutions described in the embodiments of the present application are applicable to electrical devices using the battery device. The electrical device includes the battery device of any embodiment of the present application, and the battery device is used to provide electrical energy.

[0087] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a planer, etc. The embodiments of the present application do not make special restrictions on the above electrical devices.

[0088] It should be noted that the technical solutions described in the embodiments of this application are not only limited to the battery device described above, but can also be applied to all electrical devices and energy storage devices including battery devices. However, for the sake of simplicity of description, the following embodiments will be described by taking an electric vehicle as an example.

[0089] Referring to Figure 1 , inside the vehicle 1000, a controller 200, a motor 300, and a battery device 100 can be provided. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be provided at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000 and be used for the circuit system of the vehicle 1000, such as for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Referring to Figure 2 , in order to meet different power usage requirements, the battery device 100 includes a plurality of battery cells 10. A battery cell 10 refers to the smallest unit that makes up a battery module or a battery pack. The plurality of battery cells 10 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the plurality of battery cells 10. The plurality of battery cells 10 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the plurality of battery cells 10 is accommodated in a box body 20. Of course, the battery device 100 can also be in the form that a plurality of battery cells 10 are first connected in series, in parallel, or in a series-parallel combination to form battery modules, and then the plurality of battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the box body 20. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing the electrical connection among the plurality of battery cells 10. Among them, each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0091] Referring to Figures 2 - 7, an embodiment of the present application provides a battery device 100, which includes a box body 20, a plurality of battery cells 10, and a heat exchange component 30. The plurality of battery cells 10 are arranged in the box body 20. The heat exchange component 30 includes at least two heat exchange elements, at least one heat exchange element is set as a flexible element 31, and at least one heat exchange element is set as a rigid element 32. The flexible element 31 and the rigid element 32 are stacked to form at least one medium flow channel 30a. At least one medium flow channel 30a is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells 10. Wherein, the heat exchange component 30 includes a hot melt layer 34, the hot melt layer 34 connects the rigid element 32 and the flexible element 31, and an exhaust structure 35 is formed at the connection between the hot melt layer 34 and the rigid element 32 and / or at the connection between the hot melt layer 34 and the flexible element 31.

[0092] The term "plurality" in the embodiments of the present application refers to a quantity of two or more.

[0093] Please refer to Figure 2 , the battery device 100 includes a box body 20 and a plurality of battery cells 10, and the plurality of battery cells 10 are arranged in the box body 20.

[0094] The box body 20 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder, or sphere. The material of the box body 20 can be alloy materials such as aluminum alloy and ferroalloy, or polymer materials such as polycarbonate and polyisocyanurate foam, or composite materials such as glass fiber reinforced epoxy resin.

[0095] The box body 20 is used to encapsulate the battery cells 10, and the box body 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 10.

[0096] As an example, the box body 20 is usually a cuboid structure. The length direction and the width direction of the box body 20 are both parallel to the horizontal plane, and the length direction of the box body 20 is parallel to the longest side of the cuboid structure of the box body 20.

[0097] Refer to Figure 3 , the heat exchange component 30 includes at least two heat exchange elements, at least one heat exchange element is set as a flexible element 31, and at least one heat exchange element is set as a rigid element 32. The flexible element 31 and the rigid element 32 are stacked to form at least one medium flow channel 30a. At least one medium flow channel 30a is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells 10.

[0098] Here, the flexibility of the flexible member 31 refers to the material property of the structure. Such a property can be the property bestowed on the material due to its relatively light mass, or it can be the property bestowed on the material due to at least any one of the properties such as the thickness, stiffness, strength, elastic modulus, etc. of the material. As an example, the material of the flexible member 31 can be selected as a material with a relatively light mass compared to conventional structural materials such as aluminum plates and steel plates, and its flexibility can be controlled by the thickness, width, length, and type of the material of the flexible member 31.

[0099] By setting the heat exchange assembly 30 in the form including the flexible member 31 in the embodiments of the present application, it is beneficial to reduce the weight of the heat exchange assembly 30, and thus improve the energy density of the heat exchange assembly 30.

[0100] Furthermore, the flexible member 31 has a certain property of being expandable or contractible. It can also be understood that the flexible member 31 can be a structure with elastic deformation. The flexible member 31 has the ability to deform and recover from deformation, so that the heat exchange assembly 30 can adapt to the external contour shape of the battery cell 10 or other components through a certain elastic deformation, so as to improve the fitting degree of the heat exchange assembly 30 with the box body 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the box body 20 and / or the battery cell 10, and further improving the heat exchange efficiency.

[0101] Here, the rigidity of the rigid member 32 refers to the material property of the structure. Such a property can be the property bestowed on the material due to its relatively heavy mass, or it can be the property bestowed on the material due to at least any one of the properties such as the thickness, stiffness, strength, elastic modulus, etc. of the material. As an example, the material of the rigid member 32 can be selected as a metal plate similar to conventional aluminum plates and steel plates, or a material of a composite plate structure, and its rigidity can be controlled by the thickness, width, length, and type of the material of the rigid member 32. By setting the heat exchange assembly 30 in the form including the rigid member 32 in the embodiments of the present application, the flexible member 31 can be supported, which is beneficial to improving the overall structural strength and stability of the heat exchange assembly 30.

[0102] By setting the heat exchange assembly 30 to include the flexible member 31 and the rigid member 32, while enabling the heat exchange assembly 30 to have a flexible function, the heat exchange assembly 30 can also have a certain structural strength.

[0103] The flexible function of the heat exchange assembly 30 can make the heat exchange surface of the heat exchange assembly 30 fit better with the battery cell 10, and further improve the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30.

[0104] The flexible member 31 and the rigid member 32 are stacked to form at least one medium flow channel 30a, which means that the heat exchange assembly 30 forms the medium flow channel 30a between the flexible member 31 and the rigid member 32. In other words, the flexible member 31 constitutes at least part of the side wall of the medium flow channel 30a, and the rigid member 32 also constitutes at least part of the side wall of the medium flow channel 30a. The heat exchange medium circulates in the medium flow channel 30a to achieve heat exchange with the battery cell 10.

[0105] As an example, a flow channel groove is formed by the depression of the surface of the flexible member 31 facing the rigid member 32, and the surface of the rigid member 32 facing the flexible member 31 is a plane, and the medium flow channel 30a is formed by enclosing the plane and the flow channel groove. Alternatively, a flow channel groove is formed by the depression of the surface of the rigid member 32 facing the flexible member 31, and the surface of the flexible member 31 facing the rigid member 32 is a plane, and the medium flow channel 30a is formed by enclosing the plane and the flow channel groove. Or, flow channel grooves are formed by the depression of the surfaces of the flexible member 31 and the rigid member 32 facing each other, and the medium flow channel 30a is formed by enclosing the flow channel groove of the flexible member 31 and the flow channel groove of the rigid member 32.

[0106] The medium flow channel 30a is used to conduct the heat exchange medium. It should be noted that the specific type of the heat exchange medium is not limited here, as long as it can achieve the heat exchange effect on the battery cell 10. For example, it can be gaseous or liquid. In the embodiments of the present application, the heat exchange medium is taken as the coolant as an example for description.

[0107] The specific number of the medium flow channels 30a is not limited here. It can be one or multiple.

[0108] At least one heat exchange member being set as the flexible member 31 means that the number of the flexible members 31 is one or more. In the embodiments where multiple heat exchange members are set as the flexible members 31, the flexible members 31 can be the same or different.

[0109] At least one heat exchange member being set as the rigid member 32 means that the number of the rigid members 32 is one or more. In the embodiments where multiple heat exchange members are set as the rigid members 32, the rigid members 32 can be the same or different.

[0110] As an example, the heat exchange assembly 30 includes two heat exchange members, one of which is the flexible member 31 and the other is the rigid member 32. As an example, the heat exchange assembly 30 includes three or more heat exchange members, at least two of which are the flexible members 31, or at least two of which are the rigid members 32, and the flexible members 31 and the rigid members 32 are arranged alternately.

[0111] As an example, the rigid member 32 is a rigid plate-like structure, which can support the flexible member 31, thereby being beneficial to improving the overall structural strength and stability of the heat exchange assembly 30.

[0112] As an example, the heat exchange component 30 has an inlet 30b and an outlet 30c, both of which are in communication with the medium flow channel 30a. Here, the inlet 30b and the outlet 30c are for the heat exchange medium to enter and flow out of the medium flow channel 30a. It can be the rigid member 32 that forms the above-mentioned inlet 30b and / or outlet 30c, or it can be the flexible member 31 that forms the above-mentioned inlet 30b and / or outlet 30c.

[0113] Referring to Figure 3 , the heat exchange component 30 further includes a connecting member 33 in communication with the inlet 30b and a connecting member 33 in communication with the outlet 30c. As an example, the connecting member 33 includes a nozzle. As an example, both the inlet 30b and the outlet 30c are formed in the rigid member 32, and the connecting member 33 is brazed to the rigid member 32.

[0114] The principle of the heat exchange component 30 for heat-exchanging the battery cell 10 is as follows: The heat exchange medium output by a heat exchange medium source (not shown in the figure) enters the medium flow channel 30a through the inlet 30b of the heat exchange component 30. After the heat exchange medium exchanges heat with the battery cell 10, the heat exchange medium flows out through the outlet 30c of the heat exchange component 30, completing the heat exchange of the battery cell 10.

[0115] Here, the heat exchange component 30 can dissipate heat from the battery cell 10 or can heat the battery cell 10.

[0116] The principle of the heat exchange component 30 for dissipating heat from the battery cell 10 is as follows: The heat exchange medium output by the heat exchange medium source enters the medium flow channel 30a through the inlet 30b of the heat exchange component 30. After the heat exchange medium absorbs the heat generated during the operation of the battery cell 10, the heat exchange medium flows out through the outlet 30c of the heat exchange component 30, releasing heat and completing the cooling and heat dissipation of the battery cell 10.

[0117] The principle of the heat exchange component 30 for heating the battery cell 10 is as follows: The heat exchange medium output by the heat exchange medium source enters the medium flow channel 30a through the inlet 30b of the heat exchange component 30. The heat exchange medium transfers heat to the battery cell 10 to realize heating of the battery cell 10. After that, the heat exchange medium flows out through the outlet 30c of the heat exchange component 30, completing the heating of the battery cell 10.

[0118] The specific installation position of the heat exchange component 30 is not limited here.

[0119] In some embodiments, at least one heat exchange component 30 is disposed on the top side of the battery cell 10. As an example, referring to Figure 2, the box body 20 includes a box main body 21 and a top cover 22 connected to the top side of the box main body 21. In this case, at least one heat exchange component 30 is disposed between the top cover 22 and the battery cell 10, and / or at least one heat exchange component 30 is disposed on the side of the top cover 22 facing away from the battery cell 10. As another example, the top side of the box body 20 has an opening, and the heat exchange component 30 covers the opening.

[0120] In some embodiments, at least one heat exchange component 30 is disposed on the bottom side of the battery cell 10. As an example, referring to Figure 2 , the box body 20 includes a bottom guard plate 23 connected to the bottom side of the box main body 21. In this case, at least one heat exchange component 30 is disposed between the bottom guard plate 23 and the battery cell 10, and / or at least one heat exchange component 30 is disposed on the side of the bottom guard plate 23 facing away from the battery cell 10. As another example, the bottom side of the box body 20 has an opening, and the heat exchange component 30 covers the opening.

[0121] In some embodiments, at least one heat exchange component 30 is disposed on one side of the battery cell 10 along the length direction or the width direction of the box body 20. As an example, referring to Figure 2 , the box main body 21 includes side beams 211 for restricting the battery cell 10, and the heat exchange component 30 is disposed between the side beams 211 and the battery cell 10, or the heat exchange component 30 is disposed on the side of the side beams 211 facing away from the battery cell 10.

[0122] In some embodiments, at least one heat exchange component 30 is disposed between two adjacent battery cells 10. As an example, at least one heat exchange component 30 is disposed between the large faces of two adjacent battery cells 10. Here, the large face refers to the face with the largest area among the surfaces of the battery cell 10.

[0123] In the embodiments where the heat exchange component 30 is disposed between the box body 20 and the battery cell 10, the relative positional relationship between the rigid member 32 and the flexible member 31 of the heat exchange component 30 and the battery cell 10 is not limited. For example, the rigid member 32 can face the battery cell 10 and the flexible member 31 can face the box body 20, so as to provide stronger support force for the battery cell 10. Or, the flexible member 31 can face the side of the battery cell 10 and the rigid member 32 can face the box body 20, so as to improve the tightness of the fit between the heat exchange component 30 and the battery cell 10.

[0124] Referring to Figures 4 - 6 , the heat exchange component 30 includes a hot melt layer 34 that connects the rigid member 32 and the flexible member 31.

[0125] Here, the hot-melt layer 34 specifically refers to a layered structure formed by a hot-melt material, and the hot-melt material includes, but is not limited to, one or more of polypropylene (PP), polyethylene (PE), polyester (PES), polyamide (PA), ethylene-vinyl acetate copolymer (EVA).

[0126] Before actually performing the connection operation, the hot-melt layer 34 can be disposed on the rigid member 32, or the hot-melt layer 34 can be disposed on the flexible member 31, or the hot-melt layer 34 can be disposed on both the rigid member 32 and the flexible member 31, and there is no limitation thereto.

[0127] In the related art, the heat exchange component 30 is formed by welding two high-strength aluminum alloys. Since the high-strength aluminum alloys (such as 5 series, 6 series, etc.) have a relatively high alloy content, alloy elements will precipitate during welding, affecting the welding quality.

[0128] In this embodiment, the connection between the flexible member 31 and the rigid member 32 is achieved through the hot-melt layer 34. It can be understood that the melting temperature of the hot-melt layer 34 is generally (usually 150°C ± 10°C) lower than the brazing temperature in the related art, and alloy elements will not precipitate, which is beneficial to further improving the structural strength of the heat exchange component 30.

[0129] Specifically, the flexible member 31 and the rigid member 32 form a hot-pressing area 30d and a medium flow channel 30a. The hot-pressing area 30d divides the heat exchange component 30 to form the medium flow channel 30a. The hot-pressing area 30d specifically refers to the area where the flexible member 31 and the rigid member 32 are connected through the hot-melt layer 34. In other words, the flexible member 31 and the rigid member 32 are connected to each other through the hot-melt layer 34 in the hot-pressing area 30d, and there is no connection in the area outside the hot-pressing area 30d but a gap is formed between them, and this gap is the medium flow channel 30a.

[0130] The hot-melt layer 34 can be only disposed in the above-mentioned hot-pressing area 30d, that is, the hot-melt layer 34 can be not disposed in the area corresponding to the medium flow channel 30a. Or, the hot-melt layer 34 can entirely cover the rigid member 32 and / or the flexible member 31, but during the actual connection process, hot pressing is only performed at the position corresponding to the hot-pressing area 30d, so that only the hot-melt layer 34 at this position melts and connects the rigid member 32 and the flexible member 31.

[0131] In this application, it is proposed that during the process of connecting the rigid member 32 and the flexible member 31 with the aid of the hot-melt layer 34, air bubbles may appear in the hot-melt layer 34. If these air bubbles remain in the hot-melt layer 34 after hot pressing, the connection strength will be affected, resulting in a risk of heat exchange medium leakage at the connection between the rigid member 32 and the flexible member 31, affecting the use reliability of the heat exchange component 30.

[0132] For this reason, referring to Figures 4 - 7, an exhaust structure 35 is formed at the connection between the hot melt layer 34 and the rigid member 32 and / or at the connection between the hot melt layer 34 and the flexible member 31.

[0133] The specific structural form of the exhaust structure 35 is not limited. As an example, the exhaust structure 35 can be a groove-like structure. The groove-like structure is communicated with the medium flow channel 30a and / or the groove-like structure is communicated with the external environment (for example, the groove-like structure extends to the outer periphery of the hot melt layer 34). Thus, the air during the connection process can be discharged into the medium flow channel 30a and / or the external environment, thereby reducing the bubble residue in the hot melt layer 34.

[0134] Here, the exhaust structure 35 can be arranged on the hot melt layer 34. As an example, the exhaust structure 35 is arranged on the side of the hot melt layer 34 facing the rigid member 32, and / or the exhaust structure 35 is arranged on the side of the hot melt layer 34 facing the flexible member 31. As a supplement or alternative, the exhaust structure 35 can also be arranged on the side of the flexible member 31 facing the hot melt layer 34, and / or arranged on the side of the rigid member 32 facing the hot melt layer 34.

[0135] The structural forms of the exhaust structure 35 arranged on the hot melt layer 34, the exhaust structure 35 arranged on the rigid member 32, and the exhaust structure 35 arranged on the flexible member 31 can be the same or different, and this is not limited.

[0136] In the battery device 100 according to the embodiment of the present application, at least one heat exchange member of the heat exchange assembly 30 is arranged as the flexible member 31. The flexible member 31 has a light weight, which is beneficial to reducing the weight of the heat exchange assembly 30, and further improving the energy density of the battery device 100.

[0137] On the other hand, the flexible member 31 has a certain flexibility, which can make the heat exchange assembly 30 fit better with the box body 20 and / or the battery cell 10. Thus, it is beneficial to absorb the assembly tolerance of the heat exchange assembly 30, without using caulking agents or heat-conducting materials, improving the fit degree between the heat exchange assembly 30 and the box body 20 and / or the battery cell 10, increasing the effective heat exchange area between the heat exchange assembly 30 and the box body 20 and / or the battery cell 10, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30.

[0138] On yet another hand, by arranging at least one heat exchange member as the rigid member 32, the flexible member 31 and the rigid member 32 are stacked to form at least one medium flow channel 30a. The rigid member 32 can support the flexible member 31, which is beneficial to improving the overall structural strength and stability of the heat exchange assembly 30, and further improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30. In addition, by arranging the rigid member 32, the heat exchange assembly 30 has sufficient structural strength to carry the battery cell 10, improving the applicability of the heat exchange assembly 30.

[0139] On the other hand, the rigid member 32 and the flexible member 31 are connected by the hot melt layer 34. The temperature during connection (150°C ± 10°C) is lower than the soldering temperature in the related art, and alloy elements will not precipitate, which is beneficial to further improving the structural strength of the heat exchange assembly 30. Moreover, an exhaust structure 35 is formed at the connection between the hot melt layer 34 and the flexible member 31 and / or at the connection between the hot melt layer 34 and the rigid member 32, which can increase the probability of reducing the occurrence of bubbles in the hot melt layer 34, thereby enhancing the connection strength between the flexible member 31 and the rigid member 32, reducing the risk of heat exchange medium leakage, and improving the use reliability.

[0140] In some embodiments, the exhaust structure 35 includes a first exhaust groove 35a. Refer to Figures 4 - 7 , a partial depression is formed on one side surface of the hot melt layer 34 facing the rigid member 32 and / or on one side surface facing the flexible member 31 to form the first exhaust groove 35a.

[0141] Here, the hot melt layer 34 may have only the first exhaust groove 35a formed on one side surface facing the flexible member 31, or only the first exhaust groove 35a formed on one side surface facing the rigid member 32, or the first exhaust groove 35a may be formed on both side surfaces.

[0142] As an example, the hot melt layer 34 may itself be part of the structure of the flexible member 31. For example, in the case where the flexible member 31 includes a metalized plastic film, the plastic outer layer of the metalized plastic film forms the hot melt layer 34. In this case, the first exhaust groove 35a may be formed only on one side surface of the hot melt layer 34 facing the rigid member 32.

[0143] The number of the first exhaust grooves 35a may be multiple. Those skilled in the art can specifically determine the number, size, and setting position of the first exhaust grooves 35a according to the actual exhaust requirements. As an example, the first exhaust grooves 35a are micron-level structures, and each first exhaust groove 35a is distributed in parallel on the surface of the hot melt layer 34, or staggered on the surface of the hot melt layer 34 (for example, distributed in a roughly checkerboard pattern).

[0144] The first exhaust groove 35a can be specifically formed on the surface of the hot melt layer 34 by means such as laser etching and mold injection, and there is no limitation thereto. Since the hot melt material in the hot melt layer 34 itself is a material with relatively low stiffness and hardness, the cost of forming the first exhaust groove 35a on the surface of the hot melt layer 34 is relatively low.

[0145] It can be understood that since the hot melt layer 34 will melt during the actual connection process, after the connection is completed, the first exhaust groove 35a will basically disappear.

[0146] In this embodiment, the first exhaust groove 35a formed by making the surface of the hot melt layer 34 recessed can, on the one hand, reduce the manufacturing cost while realizing exhaust, and on the other hand, can improve the integrity of the connection interface as much as possible (making the first exhaust groove 35a basically disappear) after the actual connection is completed, thereby further improving the connection strength.

[0147] It should be noted that the following descriptions related to the position, shape, etc. of the first exhaust groove 35a refer to the position and shape of the first exhaust groove 35a before the actual connection is completed. Since the hot melt layer 34 will melt during the connection process, the position, shape, etc. of the first exhaust groove 35a on the hot melt layer 34 after the actual connection is completed may change, and even the first exhaust groove 35a may completely disappear.

[0148] In some embodiments, referring to Figure 5 , at least a part of the first exhaust groove 35a extends to the medium flow channel 30a. Here, the first exhaust groove 35a extending to the medium flow channel 30a specifically means that the gas in the first exhaust groove 35a can flow along the first exhaust groove 35a into the medium flow channel 30a. As an example, the first exhaust groove 35a forms an opening on the flow channel wall of the medium flow channel 30a.

[0149] Only a part of the first exhaust groove 35a may extend to the medium flow channel 30a, or each first exhaust groove 35a may extend to the medium flow channel 30a, and there is no limitation on this.

[0150] As mentioned above, the hot melt layer 34 will melt after the actual connection process. Therefore, although the first exhaust groove 35a here extends to the medium flow channel 30a, after the actual connection is completed, the first exhaust groove 35a will basically disappear, so the heat exchange medium will not leak through here.

[0151] In this embodiment, by making at least a part of the first exhaust groove 35a extend to the medium flow channel 30a, the medium flow channel 30a can be used for exhaust, improving the exhaust efficiency and reducing the bubble generation rate.

[0152] In some embodiments, still referring to Figure 5 , at least a part of the first exhaust groove 35a extends to the outer periphery of the heat exchange assembly 30. The first exhaust groove 35a extending to the outer periphery of the heat exchange assembly 30 specifically means that the gas can flow along the first exhaust groove 35a to the outer periphery of the heat exchange assembly 30 and then be discharged into the external environment. As an example, the first exhaust groove 35a forms an opening on the outer peripheral surface of the heat exchange assembly 30 (the surface in the direction perpendicular to the lamination direction of the rigid member 32 and the flexible member 31).

[0153] In this embodiment, by extending at least a part of the first exhaust groove 35a to the outer periphery of the heat-melting layer 34, gas can be discharged to the external environment, thereby improving the exhaust efficiency and reducing the occurrence rate of bubbles.

[0154] In some embodiments, still referring to Figure 5 , the medium flow channel 30a includes a plurality of sub-flow segments, and at least a part of the first exhaust groove 35a is arranged between two adjacent sub-flow segments, and this part of the first exhaust groove 35a extends to both of these two sub-flow segments at the same time. In this way, this part of the first exhaust groove 35a can exhaust gas into the two sub-flow segments simultaneously, thereby further improving the exhaust efficiency and reducing the occurrence rate of bubbles.

[0155] In some embodiments, still referring to Figure 5 , at least a part of the first exhaust groove 35a is arranged between the medium flow channel 30a and the outer periphery of the heat exchange component 30, and this part of the first exhaust groove 35a extends to the medium flow channel 30a and the outer periphery at the same time. In this way, this part of the first exhaust groove 35a can exhaust gas into the medium flow channel 30a and the external environment simultaneously, thereby further improving the exhaust efficiency and reducing the occurrence rate of bubbles.

[0156] In some embodiments, the extending direction of at least a part of the first exhaust groove 35a intersects with the extending direction of the medium flow channel 30a.

[0157] It can be understood that the medium flow channel 30a may have multiple extending directions (for example, in some embodiments, the medium flow channel 30a may extend in a serpentine shape), and the first exhaust groove 35a may also have various extending directions. The specific meaning that the extending direction of at least a part of the first exhaust groove 35a intersects with the extending direction of the medium flow channel 30a here is that there is at least one first exhaust groove 35a whose extending direction intersects with the extending direction of at least one section of the medium flow channel 30a.

[0158] As mentioned above, the first exhaust groove 35a can achieve exhaust by extending to the outer periphery of the medium flow channel 30a and / or the heat exchange component 30. Most of the flow segments of the medium flow channel 30a generally extend along a direction parallel to one side outer edge of the heat exchange component 30 (taking the heat exchange component 30 as a rectangle as an example, most of the flow segments of the medium flow channel 30a generally extend along a direction parallel to the long side of the heat exchange component 30). Therefore, the intersection of the extending direction of the first exhaust groove 35a and the extending direction of the medium flow channel 30a helps to shorten the extending distance when the first exhaust groove 35a extends to the outer periphery of the medium flow channel 30a and / or the heat exchange component 30, so that the exhaust path of the first exhaust groove 35a is shortened.

[0159] In this embodiment, by making the extending direction of at least a part of the first exhaust groove 35a intersect with the extending direction of the medium flow channel 30a, the exhaust path of this part of the first exhaust groove 35a can be shortened as much as possible, thereby further improving the exhaust efficiency and reducing the bubble generation rate.

[0160] In some embodiments, referring to Figure 6 , along the lamination direction of the flexible member 31 and the rigid member 32, the size of the first exhaust groove 35a is smaller than the size of the hot melt layer 34.

[0161] That is, in the lamination direction, the first exhaust groove 35a does not penetrate through the hot melt layer 34. As an example, along the lamination direction, the ratio of the size of the first exhaust groove 35a to the size of the hot melt layer 34 at the corresponding position is 0.1 - 0.8, such as 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, etc.

[0162] In this embodiment, in the lamination direction, the first exhaust groove 35a does not penetrate through the hot melt layer 34. In this way, the uniformity of the thickness at the position where the first exhaust groove 35a is provided and the position where the first exhaust groove 35a is not provided in the hot melt layer 34 after the actual connection is completed can be improved, thereby further improving the connection strength.

[0163] In some embodiments, referring to Figure 6 , as mentioned above, the rigid member 32 and the flexible member 31 form a plurality of hot pressing regions 30d, the hot melt layer 34 is provided in the hot pressing regions 30d, and the plurality of hot pressing regions 30d divide the heat exchange component 30 to form the medium flow channel 30a. In this embodiment, the first exhaust groove 35a is provided in each hot pressing region 30d.

[0164] In this embodiment, by providing the first exhaust groove 35a in each hot pressing region 30d, it helps to make each hot pressing region 30d be able to exhaust more fully, thereby further reducing the bubble generation rate.

[0165] In some embodiments, referring to Figure 7 , the exhaust structure 35 includes a second exhaust groove 35b, and the second exhaust groove 35b is formed on the side of the rigid member 32 facing the hot melt layer 34. The second exhaust groove 35b extends to the outer periphery of the heat exchange component 30, and the second exhaust groove 35b forms a gap with the medium flow channel 30a.

[0166] Different from the first exhaust groove 35a, the second exhaust groove 35b is formed in the rigid member 32, which will still exist after the actual connection is completed. Therefore, the second exhaust groove 35b is arranged here to extend to the outer peripheral edge of the heat exchange assembly 30, and the second exhaust groove 35b is spaced from the medium flow channel 30a. In this way, the probability of the heat exchange medium leaking through the second exhaust groove 35b is reduced.

[0167] Furthermore, it can be understood that in this embodiment, after the hot melt layer 34 melts, the hot melt material will flow into the second exhaust groove 35b, thereby at least partially filling the second exhaust groove 35b, which helps to increase the contact area between the hot melt layer 34 and the rigid member 32, thereby enhancing the connection strength between the two.

[0168] The second exhaust groove 35b can be formed in the rigid member 32 by means such as laser etching, chemical etching, stamping, etc., and no limitation is imposed thereon.

[0169] In this embodiment, the rigid member 32 forms the second exhaust groove 35b to achieve exhaust. At the same time, the hot melt layer 34 will at least partially fill the second exhaust groove 35b after the connection is completed. In this way, it helps to further enhance the connection strength between the hot melt layer 34 and the rigid member 32.

[0170] It should be noted that the exhaust structure 35 may include both the above-mentioned first exhaust groove 35a and the second exhaust groove 35b here, or may include only one of them, and no limitation is imposed thereon.

[0171] In some embodiments, the first exhaust groove 35a is formed on the surface of the hot melt layer 34 facing the rigid member 32, and the second exhaust groove 35b is formed on the surface of the rigid member 32 facing the hot melt layer 34. The exhaust cross-sectional area of the second exhaust groove 35b is larger than that of the first exhaust groove 35a. The exhaust cross-sectional area is the area of the cross-section perpendicular to the exhaust direction.

[0172] It should be noted that the exhaust cross-sectional area of the first exhaust groove 35a here refers to the exhaust cross-sectional area of a single first exhaust groove 35a, and the exhaust cross-sectional area of the second exhaust groove 35b also refers to the exhaust cross-sectional area of a single second exhaust groove 35b.

[0173] The ratio of the exhaust cross-sectional area of the first exhaust groove 35a to the exhaust cross-sectional area of the second exhaust groove 35b is not limited. As an example, the ratio of the exhaust cross-sectional area of the first exhaust groove 35a to the exhaust cross-sectional area of the second exhaust groove 35b is 2 - 50. It can be 2, 3, 5, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, etc.

[0174] Here, the exhaust cross-sectional area of the second exhaust groove 35b is larger than that of the first exhaust groove 35a, which will help improve the exhaust volume in the area where the second exhaust groove 35b is located. As mentioned above, the rigid member 32 and the flexible member 31 form a plurality of hot pressing regions 30d. In some hot pressing regions 30d with larger areas, the exhaust demand is relatively high. It may be difficult to complete sufficient exhaust only by the first exhaust groove 35a in such regions. Therefore, a second exhaust groove 35b can be added in such regions to further improve the exhaust sufficiency.

[0175] Furthermore, the rigid member 32 can be provided with the second exhaust groove 35b only in the regions with relatively high exhaust demand as described above, and no exhaust groove is provided in other regions. In this way, the number of the second exhaust grooves 35b provided on the rigid member 32 can be reduced, thereby helping to reduce costs and improve the structural strength of the rigid member 32.

[0176] In this embodiment, by simultaneously providing the first exhaust groove 35a and the second exhaust groove 35b, and making the exhaust cross-sectional area of the second exhaust groove 35b larger than that of the first exhaust groove 35a, on the one hand, the exhaust sufficiency can be further improved, and the occurrence rate of bubbles can be reduced. On the other hand, the number of the second exhaust grooves 35b provided on the rigid member 32 can be reduced, thereby helping to reduce costs and improve the structural strength of the rigid member 32.

[0177] In some embodiments, the rigid member 32 and the flexible member 31 form a plurality of hot pressing regions 30d. The hot melt layer 34 is disposed in the hot pressing regions 30d. The plurality of hot pressing regions 30d divide the heat exchange assembly 30 to form a medium flow channel 30a. The first exhaust groove 35a is provided in each hot pressing region 30d. The second exhaust groove 35b is provided in a first region among the plurality of hot pressing regions 30d. The first region is a hot pressing region 30d where the distance between two relatively arranged boundaries is greater than or equal to 50 mm and / or the area is greater than or equal to 500 mm².

[0178] Here, the distance between two relatively arranged boundaries being greater than or equal to 50 mm means that the distance between two relatively arranged boundaries in any direction is greater than or equal to 50 mm.

[0179] It can be understood that any hot pressing region 30d that meets the above requirements is the first region, that is, the number of the first regions can be multiple.

[0180] In this embodiment, the second exhaust groove 35b is added in the hot pressing regions 30d (the first region) with relatively large area and / or welding width. In this way, the exhaust sufficiency of the first region is ensured, and at the same time, the number of the second exhaust grooves 35b provided on the rigid member 32 is further reduced, which helps to improve the structural strength of the rigid member 32.

[0181] In some embodiments, the flexible member 31 includes a metalized film.

[0182] The flexible member 31 is a single-layer or multi-layer film.

[0183] In this embodiment, since the metalized film has a thin thickness and small weight, and a medium flow channel 30a is formed between the metalized film and the heat exchange member, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange assembly 30 can be reduced.

[0184] In some embodiments, the flexible member 31 includes an aluminum-plastic film.

[0185] The aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation.

[0186] In some embodiments, the flexible member 31 is a layered structure. The flexible member 31 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0187] Here, the flexible member 31 includes a metal layer and a non-metal layer, that is, a composite member composed of the metal layer and the non-metal layer.

[0188] As an example, between the metal layer and the non-metal layer can be formed by hot pressing or hot melting.

[0189] The number of the metal layer and the non-metal layer is not limited.

[0190] In this embodiment, the flexible member 31 formed by stacking the metal layer and the non-metal layer in sequence has a thin thickness and small weight. It is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange assembly 30 can be reduced. In addition, the heat exchange assembly 30 will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0191] In some embodiments, the metal layer includes one of aluminum foil, copper foil, and steel foil.

[0192] By setting the metal layer as one of aluminum foil, copper foil, and steel foil, the flexible member 31 can have a certain structural strength and can play an isolation role.

[0193] In some embodiments, the non-metal layer includes one of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0194] By setting the non-metal layer as one of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible member 31 can have a certain waterproof effect.

[0195] In some embodiments, at least one non-metallic layer of the flexible member 31 faces the rigid member 32 and forms at least a part of the hot-melt layer 34.

[0196] That is, the non-metallic layer of the flexible member 31 is used as the hot-melt layer 34. In this way, the preparation difficulty and cost can be reduced.

[0197] In some embodiments, the thickness of the flexible member 31 is 0.05 mm - 0.3 mm.

[0198] As an example, the thickness of the flexible member 31 is any point value among 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.25 mm, 0.27 mm, 0.28 mm, 0.3 mm or the point value between any two of them.

[0199] In this embodiment, by setting the thickness of the flexible member 31 to 0.05 mm - 0.3 mm, while the heat exchange component 30 made of the flexible member 31 has a certain structural strength, the overall thickness of the heat exchange component 30 is relatively small, which is beneficial to reducing the overall volume and weight of the battery device 100, so as to increase the energy density of the battery device 100.

[0200] In some embodiments, the thickness of the flexible member 31 is 0.08 mm - 0.2 mm.

[0201] As an example, the thickness of the flexible member 31 is any point value among 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm or the point value between any two of them.

[0202] In this embodiment, by setting the thickness of the flexible member 31 to 0.08 mm - 0.2 mm, while the heat exchange component 30 made of the flexible member 31 has a certain structural strength, further, the overall thickness of the heat exchange component 30 is relatively small, which is beneficial to further reducing the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0203] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa - 10000 MPa.

[0204] As an example, the elastic modulus of the flexible member 31 can be a point value of any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, 10000 MPa or a point value between any two of them.

[0205] The elastic modulus describes the magnitude of the unit strain caused by the unit stress when a solid is stressed within a certain range, and it is one of the basic physical quantities of materials. The larger the elastic modulus, the greater the stiffness of the material and the stronger the compressive capacity. The elastic modulus is a physical quantity that describes the elasticity of a substance.

[0206] The measuring method of the elastic modulus of the flexible member 31 can include at least one of a static tensile test method, a dynamic test method, a sound velocity method, a nanoindentation method, and a bending method. The measuring instrument can include a nanoindenter and a universal testing machine.

[0207] Exemplarily, at normal temperature and pressure, the elastic modulus of the flexible member 31 can be measured by the nanoindentation method. The nanoindentation method uses a tiny indenter to indent the surface of the flexible member 31, and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0208] In this embodiment, by setting the elastic modulus of the flexible member 31 to 0.1 MPa - 10000 MPa, the flexible member 31 not only has a certain structural strength, improving the reliability of the heat exchange assembly 30, but also has a certain deformation ability, which can enhance the fitting degree of the heat exchange assembly 30 with the box body 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the box body 20 and / or the battery cell 10, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30.

[0209] In some embodiments, the elongation at break of the flexible member 31 is greater than that of the rigid member 32. The elongation at break is a percentage index of the elongation amount to the original length when the material is stretched and fractured. It is used to measure the deformation ability that the material can withstand during the stretching process, that is, the elongation at break represents the ductility performance of the material when it is stressed and stretched.

[0210] The breaking elongation of the flexible member 31 is greater than that of the rigid member 32. In other words, when subjected to tensile force, the extensibility of the flexible member 31 is greater than that of the rigid member 32.

[0211] In some embodiments, the breaking elongation of the flexible member 31 ranges from 30% to 300%.

[0212] The breaking elongation of the flexible member 31 can be a point value of any one of 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300% or a point value between any two of them.

[0213] In this embodiment, by setting the breaking elongation of the flexible member 31 to be in the range of 30% to 300%, the flexible member 31 can have a certain impact resistance and puncture resistance while also having a certain structural strength.

[0214] In some embodiments, the breaking elongation of the rigid member 32 ranges from 1% to 50%.

[0215] The breaking elongation of the rigid member 32 can be a point value of any one of 1%, 3%, 5%, 6%, 8%, 9%, 10%, 13%, 15%, 16%, 17%, 19%, 20%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 43%, 45%, 48%, 50% or a point value between any two of them.

[0216] In this embodiment, by setting the breaking elongation of the rigid member 32 to be in the range of 1% to 50%, the rigid member 32 can have sufficient structural strength, which is beneficial to improving the overall structural strength of the heat exchange assembly 30.

[0217] In some embodiments, the rigid member 32 is provided as a metal plate.

[0218] In this embodiment, by providing the rigid member 32 as a metal plate, the metal plate can still have good structural strength while forming the above-mentioned matte layer and / or textured layer, and has good thermal conductivity.

[0219] In some embodiments, the medium flow channel 30a includes a plurality of sub-flow channels. Each battery cell 10 corresponds to a plurality of sub-flow channels, and the extending direction of the sub-flow channels corresponding to the battery cell 10 is perpendicular to the length direction of the battery cell 10.

[0220] The plurality of sub-flow channels communicate with each other to form the medium flow channel 30a.

[0221] The extending direction of the sub-channel is perpendicular to the length direction of the battery cell 10. That is to say, a plurality of sub-channels are arranged along the length direction of the battery cell 10. In this way, the length direction of the battery cell 10 corresponds to a plurality of sub-channels.

[0222] It can be understood that along the flowing direction of the heat exchange medium, the temperature of the heat exchange medium will gradually increase. Therefore, by corresponding each battery cell 10 to a plurality of sub-channels, it is beneficial to improve the temperature uniformity of the battery cell 10.

[0223] The following further illustrates the battery device 100 provided by the embodiments of the present application with a specific embodiment.

[0224] Refer to Figures 2 - 7 , the battery device 100 includes a box body 20, a heat exchange assembly 30 and a plurality of battery cells 10. The plurality of battery cells 10 are arranged in the box body 20. The heat exchange assembly 30 includes at least two heat exchange members, at least one heat exchange member is set as a flexible member 31, and at least one heat exchange member is set as a rigid member 32. The elastic modulus of at least part of the area of the flexible member 31 is less than that of the rigid member 32. The flexible member 31 and the rigid member 32 are stacked to form at least one medium flow channel 30a. At least one medium flow channel 30a is used to conduct the heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells 10.

[0225] The heat exchange assembly 30 includes a hot melt layer 34, and the hot melt layer 34 connects the flexible member 31 and the rigid member 32. Specifically, the flexible member 31 and the rigid member 32 form a plurality of hot pressing areas 30d, the hot melt layer 34 is arranged in the hot pressing areas 30d, and the hot pressing areas 30d divide the heat exchange assembly 30 to form the medium flow channel 30a.

[0226] An exhaust structure 35 is formed at the connection between the hot melt layer 34 and the flexible member 31 and / or at the connection between the hot melt layer 34 and the rigid member 32.

[0227] Specifically, the exhaust structure 35 includes a first exhaust groove 35a and a second exhaust groove 35b.

[0228] A part of the surface of the hot melt layer 34 facing the rigid member 32 is recessed to form the first exhaust groove 35a. Along the stacking direction, the size of the first exhaust groove 35a is smaller than that of the hot melt layer 34. The first exhaust groove 35a extends to the outer periphery of the medium flow channel 30a and / or the heat exchange assembly 30, and the extending direction of the first exhaust groove 35a intersects with the extending direction of the medium flow channel 30a. Each hot pressing area 30d is provided with the first exhaust groove 35a.

[0229] On one side surface of the rigid member 32 facing the heat-melting layer 34, a second exhaust groove 35b is formed by partial depression. The second exhaust groove 35b extends to the outer peripheral edge of the heat exchange assembly 30 and is spaced apart from the medium flow channel 30a. The exhaust cross-sectional area of the second exhaust groove 35b is larger than that of the first exhaust groove 35a. The second exhaust groove 35b is provided in a first area among a plurality of hot pressing areas 30d, and in the first area, the distance between two relatively arranged boundaries is greater than 50 mm, and / or the area is greater than 500 mm² of the hot pressing area 30d.

[0230] An embodiment of the present application further provides a heat exchange assembly 30. The heat exchange assembly 30 includes at least two heat exchange members. At least one heat exchange member is provided as a flexible member 31, and at least one heat exchange member is provided as a rigid member 32. The flexible member 31 and the rigid member 32 are stacked to form at least one medium flow channel 30a. At least one medium flow channel 30a is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with a plurality of battery cells 10. Among them, the heat exchange assembly 30 includes a heat-melting layer 34. The heat-melting layer 34 connects the rigid member 32 and the flexible member 31, and an exhaust structure 35 is formed at the connection between the heat-melting layer 34 and the rigid member 32 and / or at the connection between the heat-melting layer 34 and the flexible member 31.

[0231] An embodiment of the present application further provides a flexible member 31. The flexible member 31 is used to form the medium flow channel 30a of the heat exchange assembly 30. One side of the flexible member 31 in the thickness direction has a heat-melting layer 34, and an exhaust structure 35 is formed by partial depression on the outer surface of the heat-melting layer 34.

[0232] Here, the outer surface of the heat-melting layer 34 specifically refers to one side surface of the heat-melting layer 34 facing away from the main body part of the flexible member 31.

[0233] An embodiment of the present application further provides a rigid member 32. The rigid member 32 is used to form the medium flow channel 30a of the heat exchange assembly 30. The rigid member 32 has a connection surface for contacting the heat-melting layer 34, and an exhaust structure 35 is formed by partial depression on the connection surface.

[0234] For the specific technical details of the heat exchange assembly 30, the flexible member 31, and the rigid member 32, reference may be made to the relevant parts in the above description, and details are not described herein again.

[0235] An embodiment of the present application further provides an electrical device, which includes the battery device 100 or the heat exchange assembly 30 described in any one of the above embodiments.

[0236] The heat exchange assembly 30, the flexible member 31, the rigid member 32, the hot pressing head 2000, and the electrical device in the embodiments of the present application have all the advantages of the battery device 100 described in any one of the above embodiments, and details are not described herein again.

[0237] An embodiment of the present application further provides a hot pressing head. Refer to Figure 8, the hot pressing head 2000 is used for producing the heat exchange component 30, and the heat exchange component 30 includes at least one heat exchange element configured as a flexible element 31 and at least one heat exchange element configured as a rigid element 32. The elastic modulus of at least a partial region of the flexible element 31 is less than that of the rigid element 32. The flexible element 31 and the rigid element 32 are stacked to form at least one medium flow channel 30a. At least one medium flow channel 30a is used for conducting the heat exchange medium, and the heat exchange medium is used for exchanging heat with a plurality of battery cells 10.

[0238] The hot pressing head 2000 has a hot pressing surface 2000a, and along the exhaust direction of the exhaust structure 35, the hot pressing surface 2000a is formed as an arc surface convex in the middle.

[0239] Here, the hot pressing head 2000 is specifically used to apply temperature and pressure to the rigid element 32 and / or the flexible element 31 during the production of the heat exchange component 30, so that the hot melt layer 34 melts and connects the two. The hot pressing surface 2000a of the hot pressing head 2000 specifically refers to the surface used to contact the rigid element 32 and / or the flexible element 31 during the above process.

[0240] In this embodiment, the hot pressing surface 2000a of the hot pressing head 2000 is set to be an arc surface convex in the middle along the exhaust direction of the exhaust structure 35. In this way, the middle convex part of the hot pressing surface 2000a will contact the rigid element 32 / flexible element 31 first, and the parts on both sides will contact the rigid element 32 / flexible element 31 later. In this way, it will be able to force the air flow to flow from the middle part to both sides, that is, along the exhaust direction, thereby helping to further improve the exhaust effect.

[0241] In this embodiment, the specific amplitude of the hot pressing surface 2000a of the hot pressing head 2000 can be specifically determined by those skilled in the art according to the actual area of the hot pressing surface 2000a, and no limitation is imposed thereon.

[0242] In the description of the present application, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic expression of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine the different embodiments or examples described in the present application and the features of different embodiments or examples.

[0243] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and variations can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery device, characterized in that, The battery device includes: a box body; a plurality of battery cells, which are arranged in the box body; a heat exchange component, the heat exchange component includes at least two heat exchange elements, at least one of the heat exchange elements is set as a flexible element, at least one of the heat exchange elements is set as a rigid element, the flexible element and the rigid element are stacked to form at least one medium flow channel, the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells; wherein, the heat exchange component includes a hot melt layer, the hot melt layer connects the rigid element and the flexible element, and an exhaust structure is formed at the connection between the hot melt layer and the rigid element and / or at the connection between the hot melt layer and the flexible element.

2. The battery device according to claim 1, characterized in that, The exhaust structure includes a first exhaust groove, and a partial depression is formed on at least one side surface of the hot melt layer facing the rigid element and / or on at least one side surface of the hot melt layer facing the flexible element to form the first exhaust groove.

3. The battery device according to claim 2, wherein At least a part of the first exhaust groove extends to the medium flow channel.

4. The battery device according to claim 2, characterized in that, At least a part of the first exhaust groove extends to the outer peripheral edge of the heat exchange component.

5. The battery device according to claim 2, characterized in that, At least a part of the extending direction of the first exhaust groove intersects with the extending direction of the medium flow channel.

6. The battery device according to claim 2, characterized in that, Along the stacking direction of the flexible element and the rigid element, the size of the first exhaust groove is smaller than the size of the hot melt layer.

7. The battery device according to claim 2, characterized in that, The rigid element and the flexible element form a plurality of hot pressing areas, the hot melt layer is arranged in the hot pressing areas, the plurality of hot pressing areas divide the heat exchange component to form the medium flow channel, and the first exhaust groove is arranged in each of the hot pressing areas.

8. The battery device according to claim 1, wherein, The exhaust structure includes a second exhaust groove, the second exhaust groove is formed on one side of the rigid element facing the hot melt layer, the second exhaust groove extends to the outer peripheral edge of the heat exchange component, and the second exhaust groove forms a space with the medium flow channel.

9. The battery device according to claim 8, wherein, The exhaust structure includes a first exhaust groove, and a partial depression is formed on at least one side surface of the hot melt layer facing the rigid element to form the first exhaust groove. The exhaust cross-sectional area of the second exhaust groove is larger than the exhaust cross-sectional area of the first exhaust groove, and the exhaust cross-sectional area is the area of the cross-section perpendicular to the exhaust direction.

10. The battery device according to claim 9, wherein, The rigid element and the flexible element form a plurality of hot pressing areas, the hot melt layer is arranged in the hot pressing areas, and the plurality of hot pressing areas divide the heat exchange component to form the medium flow channel. The second exhaust groove is arranged in a first area among the plurality of hot pressing areas, and the first area is a hot pressing area where the distance between two relatively arranged boundaries is greater than or equal to 50 mm, and / or the first area is a hot pressing area with an area greater than or equal to 500 mm².

11. The battery device according to any one of claims 1 to 10, characterized in that, The flexible element includes a metal plasticized film.

12. The battery device according to claim 11, wherein The flexible element includes an aluminum plastic film.

13. The battery device according to any one of claims 1 to 10, characterized in that, The flexible element is a layered structure, the flexible element includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

14. The battery device according to claim 13, characterized in that, The metal layer includes one of aluminum foil, copper foil and steel foil; and / or The non-metal layer includes one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

15. The battery device according to any one of claims 1 to 10, characterized in that, The thickness of the flexible element is 0.05 mm - 0.3 mm.

16. The battery device according to any one of claims 1 to 10, characterized in that, The elastic modulus of the flexible element is 0.1 MPa - 10000 MPa.

17. The battery device according to any one of claims 1 to 10, characterized in that, The rigid member is provided as a metal plate.

18. A heat exchange component, characterized in that, The heat exchange assembly includes at least two heat exchange members, at least one of the heat exchange members is provided as a flexible member, at least one of the heat exchange members is provided as a rigid member, the flexible member and the rigid member are stacked to form at least one medium flow channel, the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell. Wherein, the heat exchange assembly includes a hot melt layer, the hot melt layer connects the rigid member and the flexible member, and an exhaust structure is formed at the connection between the hot melt layer and the rigid member and / or at the connection between the hot melt layer and the flexible member.

19. A flexible member, characterized in that, The flexible member is used to form the medium flow channel of the heat exchange assembly. One side of the flexible member in the thickness direction has a hot melt layer, and the outer surface of the hot melt layer is partially recessed to form an exhaust structure.

20. A rigid member, characterized in that, The rigid member is used to form the medium flow channel of the heat exchange assembly. The rigid member has a connection surface for contacting the hot melt layer, and the connection surface is partially recessed to form an exhaust structure.

21. An electrical device, characterized in that, The electrical device includes the battery device according to any one of claims 1-17, or the heat exchange assembly according to claim 18.

22. A hot stamper, characterized in that, The hot pressing head is used to produce a heat exchange assembly. The heat exchange assembly includes at least two heat exchange members, at least one of the heat exchange members is provided as a flexible member, at least one of the heat exchange members is provided as a rigid member, the flexible member and the rigid member are stacked to form at least one medium flow channel, the heat exchange assembly includes a hot melt layer, the hot melt layer connects the rigid member and the flexible member, and an exhaust structure is formed at the connection between the hot melt layer and the rigid member and / or at the connection between the hot melt layer and the flexible member. The hot pressing head has a hot pressing surface. Along the exhaust direction of the exhaust structure, the hot pressing surface is formed as an arc surface with a middle bulge.

Images