Heat exchange assembly, battery device and electric equipment

Abstract

Embodiments of the present application provide a heat exchange assembly, a battery device and an electric equipment. The battery device comprises a box body, a battery cell group and a heat exchange assembly. The heat exchange assembly comprises at least two heat exchange pieces which are stacked along a first direction to form at least one medium flow channel. At least one of the heat exchange pieces is arranged as a rigid piece. Along a second direction, the rigid piece comprises at least one rigid segment and at least one flexible segment connected to the rigid segment. In the heat exchange assembly, the battery device and the electric equipment according to the embodiments of the present application, the flexible segment can absorb the stress difference at different positions of the heat exchange assembly along the second direction by deforming. Thus, the possibility of deformation and / or disengagement of the heat exchange assembly from the battery cell due to the stress difference can be reduced, thereby improving the reliability of thermal management.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of battery, and in particular, to a heat exchange assembly, a battery device and an electric equipment. BACKGROUND

[0002] In a new energy vehicle equipped with a battery device, the battery device can be used to provide power in whole or in part. In the use of the battery device, the battery cells in the battery device will generate heat. If the heat is too high, it will adversely affect the performance and service life of the battery device. Therefore, how to improve the reliability of the thermal management of the battery cells has become an important research direction in the field. SUMMARY

[0003] In view of this, embodiments of the present application aim to provide a heat exchange assembly, a battery device and an electric equipment.

[0004] A first aspect of embodiments of the present application provides a battery device, comprising: a battery cell group comprising a plurality of battery cells stacked along a first direction, a plurality of the battery cell groups being distributed along a second direction to form a battery cell array, the first direction intersecting the second direction; a box body, the battery cell group being arranged in the box body; and a heat exchange assembly arranged on one side of the battery cell along the first direction, the heat exchange assembly comprising at least two heat exchange members, the at least two heat exchange members being stacked along the first direction to form at least one medium flow channel, the at least one medium flow channel being used to guide a heat exchange medium to exchange heat with the battery cell, wherein at least one of the heat exchange members is arranged as a rigid member, along the second direction, the rigid member comprising at least one rigid segment and at least one flexible segment connected to the rigid segment.

[0005] In the battery device of embodiments of the present application, the rigid member of the heat exchange assembly is arranged to include a rigid segment and a flexible segment along the second direction, the flexible segment being capable of absorbing stress differences at different positions of the heat exchange assembly along the second direction by deforming, so that the possibility of deformation and / or disengagement of the heat exchange assembly from the battery cell due to the above stress differences can be reduced, thereby improving the reliability of thermal management.

[0006] In some embodiments, the rigid member comprises a plurality of rigid segments, and the flexible segment is arranged between adjacent rigid segments.

[0007] In the present embodiment, by arranging a plurality of rigid segments and a flexible segment between adjacent rigid segments, the stress differences in the second direction caused by the expansion force differences and / or impact acceleration differences of different battery cells can be absorbed by the deformation of the flexible segment, thereby further improving the reliability of thermal management.

[0008] In some embodiments, the rigid segments are arranged one-to-one with the battery cells.

[0009] In the present embodiment, by arranging the rigid segments one-to-one with the battery cell groups, on the one hand, better support is provided for the battery cells, and on the other hand, the flexible segments can fully absorb the stress difference caused by the battery cells.

[0010] In some embodiments, in a projection plane perpendicular to the first direction, along the second direction, the two ends of the projection of the rigid segment are flush with the two ends of the projection of the corresponding battery cell group, or the two ends of the projection of the rigid segment exceed the two ends of the projection of the corresponding battery cell group.

[0011] In the present embodiment, the rigid segment can completely cover the length range of the battery cell along the second direction, which helps to further improve the support of the rigid segment for the battery cell.

[0012] In some embodiments, along the second direction, a buffer is arranged between adjacent two battery cells, and in a projection plane perpendicular to the first direction, the projection of the flexible segment at least partially overlaps the projection of the buffer.

[0013] In the present embodiment, a buffer is arranged between adjacent battery cells in the second direction, which helps to further improve the use reliability of the battery device. Further, the projection of the flexible segment at least partially overlaps the projection of the buffer, so that by the cooperation of the flexible segment and the buffer, the stress absorption effect can be further improved.

[0014] In some embodiments, the rigid segment is provided with the flexible segment at least one end along the second direction, and the flexible segment arranged at the end of the rigid segment along the second direction has an inlet and / or outlet in communication with the medium flow channel.

[0015] In the present embodiment, by arranging the flexible segment at the end of the rigid segment and arranging the inlet and outlet in the flexible segment, the stress difference at the position for connecting with the pipeline and other positions of the heat exchange assembly can be absorbed, so that the probability of deformation of the heat exchange assembly and / or disengagement from the battery cell is reduced, and the probability of leakage of the heat exchange medium caused by disconnection of the heat exchange assembly from the pipeline is reduced.

[0016] In some embodiments, the flexible segment comprises a metal plasticized film.

[0017] In the present embodiment, since the metal plasticized film has a small thickness and weight, it is not affected by the extrusion process and does not have to meet the requirement of a large thickness, so the overall thickness and weight of the heat exchange assembly can be reduced.

[0018] In some embodiments, the flexible segment comprises an aluminum plastic film.

[0019] The aluminum-plastic film has high barrier property, good cold stamping formability, puncture resistance, electrolyte resistance, and electrical insulation.

[0020] In some embodiments, the flexible segment is a layered structure, and the flexible segment includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are sequentially stacked along the first direction.

[0021] In this embodiment, the flexible segment sequentially stacked by the metal layer and the non-metal layer has a small thickness and a small weight, is not affected by the extrusion process, does not need to meet a large thickness requirement, and thus the overall thickness and weight of the heat exchange assembly can be reduced. In addition, the heat exchange assembly does not react with the heat exchange medium flowing inside, and thus there is no possibility of corrosion and leakage.

[0022] In some embodiments, the metal layer includes one or more of an aluminum foil, a copper foil, and a steel foil; and / or, the non-metal layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0023] By setting the metal layer as one or more of an aluminum foil, a copper foil, and a steel foil, the flexible segment can have a certain structural strength and can play an isolation role. By setting the non-metal layer as one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible segment can have a certain waterproof effect.

[0024] In some embodiments, at least one of the heat exchange assemblies is a first heat exchange assembly, and at least one of the heat exchange components of the first heat exchange assembly is set as a flexible component.

[0025] In this embodiment, at least one of the heat exchange components of the first heat exchange assembly is set as a flexible component, and the flexible component has a relatively light weight, which is beneficial to reduce the weight of the heat exchange assembly and thus improve the energy density of the battery device. On the other hand, the flexible component has a certain flexibility, which can make the heat exchange assembly better fit the case and / or the battery monomer and improve the thermal management efficiency. On the other hand, the flexible component can absorb the expansion force of the battery monomer through deformation, and in particular in the case of thermal runaway of the battery monomer, the flexible component can reduce the transmission of the expansion force to the adjacent battery monomer, and reduce the probability of thermal runaway diffusion.

[0026] In some embodiments, the case includes two side beams oppositely arranged along the first direction, and the side beams are used to constrain the battery monomer group, and the heat exchange assembly between the battery monomer arranged at the end of the battery monomer group along the first direction and the side beam is the first heat exchange assembly.

[0027] In the embodiment, the heat exchange assembly arranged between the battery monomer group and the side beam is a first heat exchange assembly. Thus, the first heat exchange assembly can reduce the transmission of the expansion force of the battery monomer to the side beam of the box body, thereby helping to improve the deformation resistance of the side beam and further improving the use reliability of the battery device.

[0028] In some embodiments, in the first heat exchange assembly arranged between the battery monomer at the end of the battery monomer group along the first direction and the side beam, the rigid member is arranged on the side facing the battery monomer.

[0029] Thus, the support capability of the first heat exchange assembly for the battery monomer can be improved, and the stress uniformity of the battery monomer can be improved.

[0030] In some embodiments, at least one first heat exchange assembly is arranged between two adjacent battery monomers along the first direction.

[0031] In the embodiment, at least one first heat exchange assembly is arranged between two adjacent battery monomers along the first direction. The first heat exchange assembly can be closely attached to the two adjacent battery monomers by the deformation of the flexible member, thereby achieving a better heat exchange effect and improving the heat management efficiency. Further, the first heat exchange assembly can block the transmission of the expansion force of the battery monomer to the adjacent battery monomer to some extent, especially when thermal runaway occurs, which can reduce the probability of the expansion force of the thermal runaway battery monomer being transmitted to the adjacent battery monomer and causing damage to the adjacent battery monomer, that is, reduce the probability of thermal runaway diffusion, and improve the use reliability of the battery device.

[0032] In some embodiments, at least one heat exchange assembly is a second heat exchange assembly, and each heat exchange member of the second heat exchange assembly is arranged as a rigid member.

[0033] In the embodiment, each heat exchange member of the second heat exchange assembly is arranged as a rigid member. Thus, the battery monomer can be provided with better support and positioning, and the stability of the position of each battery monomer in actual use can be improved.

[0034] In some embodiments, each battery monomer is provided with the heat exchange assembly on opposite sides along the first direction, and at least one heat exchange assembly is a first heat exchange assembly, and at least one heat exchange member of the first heat exchange assembly is arranged as a flexible member.

[0035] The battery device provided by the embodiments of the present application is provided with heat exchange assemblies on both sides of the battery monomer along the first direction, so that the heat exchange area of the battery monomer and the heat exchange assembly is increased, and the heat management efficiency is improved, and the battery monomer can be rapidly cooled down in the case of thermal runaway. On the other hand, at least one heat exchange element of the first heat exchange assembly is provided as a flexible element, the weight of the flexible element is relatively light, the weight of the heat exchange assembly is reduced, and the energy density of the battery device is improved. On the other hand, the flexible element has a certain flexibility, the heat exchange assembly can be better attached to the box and / or the battery monomer, the heat management efficiency is improved, and the flexible element can absorb the expansion force of the battery monomer through deformation, especially in the case of thermal runaway of the battery monomer, the flexible element can reduce the transmission of the expansion force to the adjacent battery monomer, and the probability of thermal runaway diffusion is reduced. On the other hand, each heat exchange element of the second heat exchange assembly is provided as a rigid element, in the case that the flexible element in the first heat exchange assembly is deformed under pressure, the second heat exchange assembly can provide support force and certain limiting action for the battery monomer, the possibility that part of the heat exchange assembly is separated from the battery monomer due to the deformation of the flexible element is reduced, and the reliability of the heat management is improved, especially in the case of thermal runaway, the effective heat dissipation of the battery monomer is maintained.

[0036] In some embodiments, along the first direction, the first heat exchange assembly and the second heat exchange assembly are arranged alternately.

[0037] In the embodiments, by arranging the second heat exchange assembly on at least one side of each battery monomer along the first direction, a relatively stable support force can be provided for at least one side of each battery monomer along the first direction, and the possibility that both sides of the battery monomer are separated from the heat exchange assembly along the first direction is avoided as much as possible, so that the reliability of the heat management is further improved.

[0038] The second aspect of the embodiments of the present application provides a heat exchange assembly, the heat exchange assembly comprises at least two heat exchange elements, the at least two heat exchange elements are arranged in layers along a first direction to form at least one medium flow channel, the at least one medium flow channel is used to guide a heat exchange medium, the heat exchange medium is used to exchange heat with a battery monomer, wherein at least one heat exchange element is provided as a rigid element, along a second direction, the rigid element comprises at least two rigid segments and at least one flexible segment, the flexible segment connects adjacent two rigid segments, and the second direction intersects the first direction.

[0039] The third aspect of the embodiments of the present application provides a power consumption equipment, the power consumption equipment comprises 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.

[0040] The heat exchange assembly and the power consumption equipment provided by the embodiments of the present application have all the advantages of the battery device as described in any one of the above embodiments, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 A structural schematic diagram of a vehicle provided by an embodiment of the present application is shown in FIG. 1.

[0042] Figure 2 A perspective exploded schematic diagram of a battery device provided by an embodiment of the present application is shown in FIG. 2.

[0043] Figure 3 A structural schematic diagram of a heat exchange assembly provided by an embodiment of the present application is shown in FIG. 3.

[0044] Figure 4 A structural schematic diagram of the heat exchange assembly provided by an embodiment of the present application from another perspective is shown in FIG. 4.

[0045] Figure 5 A-A cross-sectional schematic diagram of FIG. 3 is shown in FIG. 5. Figure 3

[0046] Figure 6 A structural schematic diagram of a rigid member provided by an embodiment of the present application is shown in FIG. 6.

[0047] Legend of Reference Signs

[0048] 1000, vehicle; 100, battery device; 10, battery cell group; 11, battery cell; 20, box body; 21, side beam; 30, heat exchange assembly; 30a, first heat exchange assembly; 30b, second heat exchange assembly; 31, flexible member; 32, rigid member; 321, rigid segment; 322, flexible segment; 33, medium flow channel; 34, support body; 341, columnar portion; 342, connecting portion; 35, inlet member; 36, outlet member; 40, fixing member; 40a, abutting plane; 50, buffer member; 60, inlet pipeline; 61, inlet end; 70, outlet pipeline; 71, outlet end; 200, controller; 300, motor. DETAILED DESCRIPTION

[0049] 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 should not be used to limit the present application.

[0050] In the specific embodiments, various specific technical features described herein can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of various specific technical features in the present application are not described again.

[0051] ​In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0052] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0053] In the description of this application, the orientation or positional relationship of "first direction", "second direction" and "height direction" are based on the orientation or positional relationship shown in the accompanying drawings. Among them, "first direction" is the direction indicated by arrow L1 in the accompanying drawings, "second direction" is the direction indicated by arrow L2 in the accompanying drawings, and "height direction" is the direction indicated by arrow L3 in the accompanying drawings. It should be understood that these orientation terms are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0054] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this 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, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0055] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the technical terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0056] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0057] If not specifically stated, all embodiments and optional embodiments of the present application can be combined to form new technical solutions.

[0058] If not specifically stated, all technical features and optional technical features of the present application can be combined to form new technical solutions.

[0059] With the development of clean energy, more and more devices use electric energy as driving energy, and then as power batteries that can store more electric energy and can be charged and discharged repeatedly, such as lithium ion batteries. Among them, power batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields.

[0060] 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.

[0061] 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 hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0062] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator is arranged between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allows the active ions to pass through.

[0063] The electrode assembly can be in a wound structure, a stacked structure, or a hybrid structure of the wound and stacked structures.

[0064] In some embodiments, the electrode assembly is in a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0065] In some embodiments, the electrode assembly is in a stacked structure.

[0066] For example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0067] For example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments stacked.

[0068] For example, the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments stacked.

[0069] For example, a plurality of separators can be provided between any adjacent positive electrode sheets or negative electrode sheets.

[0070] For example, the separators can be continuously provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0071] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0072] In some embodiments, the electrode assembly can be provided with tabs, which can guide current out of the electrode assembly. The tabs can include positive tabs and negative tabs.

[0073] In some embodiments, the battery cell can include a housing. The housing can be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the housing can be a sealed structure or a non-sealed structure. For 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. The sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, the housing is used to encapsulate the electrode assembly and the electrolyte, etc.

[0074] For example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell can include a square battery cell, a blade battery cell, a polygonal battery cell (e.g., a hexagonal battery cell), etc.

[0075] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap covers the opening. The shell can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0076] In some embodiments, at least one electrode terminal is arranged on the housing, and the electrode terminal is electrically connected with the tab. The electrode terminal can be directly connected with the tab or indirectly connected with the tab through a current collecting member. The electrode terminal can be arranged on the end cap or arranged on the shell.

[0077] During use of the battery device, the battery cells in the battery device generate heat. If the heat is too high, it will adversely affect the performance and service life of the battery device. Therefore, how to effectively cool the battery cells in the battery device while reducing the weight of the heat exchange assembly has become an important research direction in the field. In the related art, a cooling system is arranged in the battery device box to cool the battery cells in the battery device. The cooling system can include a plurality of aluminum water cooling plates arranged in the battery device box, and the surfaces of the plurality of water cooling plates are in contact with the surfaces of the battery cells in the battery device. During use, a heat exchange medium such as water flows through the plurality of water cooling plates, thereby taking away the heat on the battery cells and cooling the battery cells.

[0078] It is pointed out in the present application that the aluminum water cooling plates are usually in contact with a plurality of battery cells at the same time, resulting in differences in stress distribution at different positions of the aluminum water cooling plates during actual use, which can cause deformation of the aluminum water cooling plates and / or disengagement of the aluminum water cooling plates from some battery cells, thereby causing a decrease in the use reliability of the battery device.

[0079] To solve the above problems, an embodiment of the present application provides a battery device, which includes a box body, a battery cell group, and a heat exchange assembly. The battery cell group is arranged in the box body, and includes a plurality of battery cells arranged in a first direction. A plurality of battery cell groups are distributed along a second direction to form a battery cell array. The first direction intersects the second direction. The heat exchange assembly is arranged on one side of the battery cells along the first direction. The heat exchange assembly includes at least two heat exchange members arranged in a stack along the first direction to form at least one medium flow channel. The at least one medium flow channel is used to guide a heat exchange medium to exchange heat with the battery cells. The at least one heat exchange member is arranged as a rigid member, and along the second direction, the rigid member includes at least one rigid segment and at least one flexible segment connected to the rigid segment.

[0080] In the battery device, the rigid part of the heat exchange assembly is provided with a rigid section and a flexible section along the second direction. The flexible section can absorb the stress difference of the rigid assembly at different positions along the second direction by deforming. Thus, the possibility of deformation and / or disengagement of the heat exchange assembly from the battery cell due to the stress difference can be reduced, thereby improving the reliability of thermal management.

[0081] The technical solutions described in the embodiments of the present application are suitable for use in an electric device using a battery device. The electric device includes the battery device of any of the embodiments of the present application, and the battery device is used to provide electric energy.

[0082] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above-mentioned electric devices.

[0083] It should be noted that the technical solutions described in the embodiments of the present application are not only limited to the above-mentioned battery device, but also can be applied to all electric devices and energy storage devices including the battery device. However, for the sake of simplicity, the following embodiments are described by taking an electric vehicle as an example.

[0084] Referring to Figure 1 The inside of the vehicle 1000 can be provided with a controller 200, a motor 300, and a battery device 100. 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 arranged at the bottom, the front, or the rear 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 an operating power source of the vehicle 1000, and is used for the circuit system of the vehicle 1000, for example, for the working power demand of the vehicle 1000 during starting, navigation, and running. In another embodiment of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also can be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0085] Referring to Figure 2In order to meet different power requirements, the battery device 100 includes a plurality of battery monomers 11, which are the smallest units that make up a battery module or a battery pack. The plurality of battery monomers 11 can be connected in series, in parallel, or in a mixed connection, which means that some of the plurality of battery monomers 11 are connected in series and some are connected in parallel. The plurality of battery monomers 11 can be directly connected in series, in parallel, or in a mixed connection, and the whole formed by the plurality of battery monomers 11 is accommodated in the box 20; of course, the battery device 100 can also be in the form of a plurality of battery monomers 11 connected in series, in parallel, or in a mixed connection to form a battery module, and a plurality of battery modules connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box 20. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current combiner for realizing the electrical connection between the plurality of battery monomers 11. Each battery monomer 11 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 monomer 11 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0086] With reference to Figures 2-6 The battery device 100 provided by the embodiments of the present application includes a box 20, a battery monomer group 10, and a heat exchange assembly 30. The battery monomer group 10 is arranged in the box 20, and the battery monomer group 10 includes a plurality of battery monomers 11 arranged in a first direction. A plurality of battery monomer groups 10 are distributed in a second direction to form an array of battery monomers 11, and the first direction intersects the second direction. The heat exchange assembly 30 is arranged on one side of the battery monomers 11 along the first direction, and the heat exchange assembly 30 includes at least two heat exchange pieces arranged in a stack along the first direction to form at least one medium flow channel 33. The at least one medium flow channel 33 is used to guide a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery monomers 11. At least one of the heat exchange pieces is arranged as a rigid piece 32, and along the second direction, the rigid piece 32 includes at least one rigid segment 321 and at least one flexible segment 322 connected to the rigid segment 321.

[0087] The plurality of the embodiments of the present application means two or more.

[0088] Please refer to Figure 2 The battery device 100 includes a box 20 and a battery monomer group 10, and the battery monomer group 10 is arranged in the box 20.

[0089] The box 20 can be a simple solid structure such as a cuboid or a cylinder or a sphere, or a complex solid structure composed of a cuboid or a cylinder or a sphere. The material of the box 20 can be an alloy material such as an aluminum alloy or a ferrous alloy, a high polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin.

[0090] The box 20 is used to encapsulate the battery cell 11, and the box 20 can prevent liquid or other foreign matters from affecting the charging or discharging of the battery cell 11.

[0091] As an example, the box 20 is generally a cuboid structure, and the length direction and the width direction of the box 20 are parallel to the horizontal plane, and the length direction of the box 20 is parallel to the longest side of the cuboid structure of the box 20. The height direction of the box 20 is perpendicular to the ground.

[0092] The battery cell group 10 includes a plurality of battery cells 11 stacked along a first direction, and as an example, the first direction is perpendicular to the large surface of the battery cell 11, and here, the large surface specifically refers to the surface with the largest area among the surfaces of the battery cell 11. Taking the box 20 as a cuboid structure as an example, the first direction can be the length direction of the box 20, or the width direction of the box 20.

[0093] The battery device 100 can include a plurality of battery cells 11, and a plurality of battery cell groups 10 are distributed along a second direction to form an array of battery cells 11, and here, the second direction intersects the first direction. As an example, the first direction, the second direction, and the height direction of the box 20 are perpendicular to each other, for example, the first direction is the length direction of the box 20, and the second direction is the height direction of the box 20.

[0094] The heat exchange assembly 30 is arranged on one side of the battery cell 11 along the first direction, and here, the heat exchange assembly 30 can be arranged between adjacent battery cells 11 along the first direction, or can be arranged between the battery cell 11 at the end of the battery cell group 10 along the first direction and the box 20, and as an example, referring to Figure 2 The number of heat exchange assemblies 30 is multiple, and each battery cell 11 is provided with a heat exchange assembly 30 on each of the opposite sides along the first direction.

[0095] It should be noted that the battery device 100 can also include other heat exchange structures with heat exchange functions, such as heat exchange structures arranged on the top side and / or the bottom side of the battery cell 11, heat exchange structures arranged on one side or both sides of the battery cell 11 along the second direction, etc.

[0096] The heat exchange assembly 30 includes at least two heat exchange pieces, and the at least two heat exchange pieces are stacked along the first direction to form at least one medium flow channel 33, and the at least one medium flow channel 33 is used to guide the heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell 11.

[0097] At least two heat exchange members are stacked to form at least one medium flow channel 33. This means that between two adjacent heat exchange members, one of the heat exchange members forms a side wall of the at least one medium flow channel 33, and the other heat exchange member also forms a side wall of the at least one medium flow channel 33. The heat exchange medium flows in the medium flow channel 33 to exchange heat with the battery cell 11.

[0098] With reference to Figure 3 and Figure 4 Each heat exchange member is generally in a flat plate structure.

[0099] For example, one of the two adjacent heat exchange members is recessed to form a flow channel groove on a side surface thereof facing the other heat exchange member, and the other heat exchange member has a flat surface on a side surface thereof facing the heat exchange member, and the flat surface and the flow channel groove form the medium flow channel 33. Alternatively, the two adjacent heat exchange members are both recessed to form flow channel grooves on surfaces thereof facing each other, and the two flow channel grooves form the medium flow channel 33.

[0100] The medium flow channel 33 is used to guide the heat exchange medium. It should be noted that the specific type of the heat exchange medium is not limited herein, and the heat exchange medium can be in a gaseous or liquid state, for example. In the embodiments of the present application, the heat exchange medium is taken as a cooling liquid as an example.

[0101] The specific number of the medium flow channels 33 is not limited herein. There can be one or multiple medium flow channels 33.

[0102] The heat exchange assembly 30 can include three or more heat exchange members, and in this case, the medium flow channel 33 can be formed between each two adjacent heat exchange members.

[0103] The principle of heat exchange of the heat exchange assembly 30 to the battery cell 11 is as follows: the heat exchange medium output by a heat exchange medium source (not shown in the figure) enters the medium flow channel 33 through the inlet of the heat exchange assembly 30, exchanges heat with the battery cell 11, and then flows out of the heat exchange assembly 30 through the outlet, thereby completing the heat exchange of the battery cell 11.

[0104] Here, the heat exchange of the heat exchange assembly 30 to the battery cell 11 can be cooling of the battery cell 11, or heating of the battery cell 11.

[0105] The principle of cooling of the heat exchange assembly 30 to the battery cell 11 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 33 through the inlet of the heat exchange assembly 30, absorbs heat generated in the working process of the battery cell 11, and then flows out of the heat exchange assembly 30 through the outlet, thereby releasing heat and completing the cooling of the battery cell 11.

[0106] The principle of the heat exchange assembly 30 heating the battery monomer 11 is that the heat exchange medium output by the heat exchange medium source enters the medium flow channel 33 through the inlet of the heat exchange assembly 30, the heat exchange medium transmits heat to the battery monomer 11, and after the battery monomer 11 is heated, the heat exchange medium flows out through the outlet of the heat exchange assembly 30, thereby completing the heating of the battery monomer 11.

[0107] In this embodiment, at least one heat exchange piece of the heat exchange assembly 30 is provided as the rigid piece 32, and the materials of the remaining heat exchange pieces are not limited. As an example, referring to Figure 5 , at least one heat exchange piece of the heat exchange assembly 30 can be provided as the flexible piece 31, or each heat exchange piece of the heat exchange assembly 30 can be provided as the rigid piece 32, or the battery device 100 can simultaneously include the above two similar heat exchange assemblies 30. In order to distinguish, in the following related description, the heat exchange assembly 30 in which at least one heat exchange piece is provided as the rigid piece 32 and at least one heat exchange piece is provided as the flexible piece 31 is called the first heat exchange assembly 30a, and the heat exchange assembly 30 in which each heat exchange piece is provided as the rigid piece 32 is called the second heat exchange assembly 30b.

[0108] It should be noted that, in the absence of special instructions, the following related description of the heat exchange assembly 30 is applicable to the above-mentioned first heat exchange assembly 30a and the second heat exchange assembly 30b.

[0109] Here, the flexibility of the flexible piece 31 refers to the material properties of the structure, and this type of property can be the property of the material due to the light weight of the material, or the property of the material due to at least any one of the thickness, rigidity, strength, and elastic modulus of the material. As an example, the material of the flexible piece 31 can be selected as a material with a lighter weight than the conventional aluminum plate, steel plate, etc., and the flexibility thereof can be controlled by the thickness, width, length, and type of the material of the flexible piece 31.

[0110] Here, the rigidity of the rigid piece 32 refers to the material properties of the structure, and this type of property can be the property of the material due to the heavy weight of the material, or the property of the material due to at least any one of the thickness, rigidity, strength, and elastic modulus of the material. As an example, the material of the rigid piece 32 can be selected as a metal plate similar to the conventional aluminum plate, steel plate, etc., or a composite plate, and the rigidity thereof can be controlled by the thickness, width, length, and type of the material of the rigid piece 32.

[0111] In this embodiment, referring to Figure 6 , along the second direction, the rigid piece 32 includes at least one rigid segment 321 and at least one flexible segment 322 connected to the rigid segment 321.

[0112] Here, the rigid member 32 can be the rigid member 32 in the first heat exchange assembly 30a or the rigid member 32 in the second heat exchange assembly 30b, and no limitation is made thereto.

[0113] Here, similarly to the flexible member 31, the flexibility of the flexible section 322 refers to the material property of the structure, and such type of property can be the property of the material due to the light weight of the material or the property of the material due to at least any one of the thickness, rigidity, strength, elastic modulus, etc. of the material. As an example, the material of the flexible section 322 can be selected as a material with a light weight compared to the conventional aluminum plate, steel plate, etc. of the structure, and the flexibility thereof can be controlled by the thickness, width, length, type of the material of the flexible section 322.

[0114] As an example, in the embodiment in which at least one heat exchange member of the heat exchange assembly 30 is the flexible member 31, the material of the flexible section 322 can be the same as that of the flexible member 31. Of course, in such embodiment, the material of the flexible section 322 can also be different from that of the flexible member 31.

[0115] In the absence of a special description, the following description of the material selection and structure of the flexible member 31 and the flexible section 322 is applicable to both.

[0116] Here, the rigid section 321 is the structure embodying the rigidity of the rigid member 32, and the above definition of the rigidity of the rigid member 32 is applicable to the rigid section 321, and no further description is made herein.

[0117] In the present embodiment, the specific connection manner of the flexible section 322 and the rigid section 321 is not limited, and can be, for example, welding, bonding, etc. As an example, the flexible section 322 can be connected to the side end surface of the rigid section 321 along the second direction. As another example, a part of the flexible section 322 can be arranged in a stack with the rigid section 321 along the first direction to increase the contact area therebetween and thus the stability of the connection.

[0118] It is indicated in the present application that the stress distribution at different positions of the heat exchange assembly 30 along the second direction is different, which can be caused by the expansion force of the battery monomer 11 and / or the acceleration impact of each battery monomer 11 when the battery device 100 moves. For example, some parts of the heat exchange assembly 30 can be in contact with the battery monomer 11 and thus subjected to the expansion force of the battery monomer 11 and / or the acceleration impact of the battery monomer 11, while other parts are not in contact with the battery monomer 11, thus causing the stress difference between the above-mentioned parts. For another example, the parts of the heat exchange assembly 30 in contact with different battery monomers 11 are subjected to different expansion forces of the battery monomer 11 and / or different acceleration impacts of the battery monomer 11, thus causing the stress difference. When the full-aluminum plate commonly used in the related art is used for heat exchange, the above-mentioned stress difference can cause local deformation of the full-aluminum plate and / or cause displacement of the full-aluminum plate and thus disengagement of the full-aluminum plate from contact with some battery monomers 11.

[0119] To this end, in the present embodiment, the rigid member 32 is provided to include the rigid segments 321 and the flexible segments 322, and the flexible segments 322 are capable of absorbing the stress difference at different positions of the heat exchange assembly 30 along the second direction by deformation. In this way, the possibility of deformation of the rigid segments 321 of the rigid member 32 or disengagement of the rigid segments 321 from contact with the battery monomers 11 due to the stress difference can be reduced, and thus the reliability of thermal management can be improved.

[0120] In some embodiments, referring to Figure 6 , the rigid member 32 includes a plurality of rigid segments 321, and the flexible segments 322 are arranged between adjacent rigid segments 321.

[0121] It can be understood that the plurality of rigid segments 321 will be in contact with different battery monomers 11, respectively.

[0122] In the present embodiment, by arranging the flexible segments 322 between the plurality of rigid segments 321, the stress difference caused by different expansion forces of different battery monomers 11 and / or different acceleration impacts of different battery monomers 11 can be absorbed, and thus the reliability of thermal management can be improved.

[0123] In some embodiments, the rigid segments 321 are arranged one-to-one with the battery monomers 11.

[0124] Here, the one-to-one arrangement of the rigid segments 321 with the battery monomers 11 specifically means that the number of the rigid segments 321 in the rigid member 32 is the same as the number of a row of battery monomers 11 (i.e., the number of battery monomer groups 10) distributed along the second direction, and in a projection plane perpendicular to the first direction, the projection of the rigid segment 321 at least partially overlaps with the projection of the corresponding battery monomer 11.

[0125] In this embodiment, by arranging the rigid segments 321 one-to-one with the battery monomer groups 10, on the one hand, it helps to provide better support for the battery monomers 11, and on the other hand, it helps to make the flexible segments 322 fully absorb the stress difference caused by each battery monomer 11.

[0126] It should be noted that in some other embodiments, one rigid segment 321 can correspond to multiple battery monomers 11.

[0127] In some embodiments, in the projection plane perpendicular to the second direction, along the second direction, the two ends of the projection of the rigid segment 321 are flush with the two ends of the projection of the corresponding battery monomer 11, or the two ends of the projection of the rigid segment 321 exceed the two ends of the projection of the corresponding battery monomer 11.

[0128] In this embodiment, the rigid segment 321 can completely cover the length range of the battery monomer 11 along the second direction, which helps to further improve the support of the rigid segment 321 to the battery monomer 11.

[0129] In some embodiments, referring to Figure 2 , the battery device 100 further comprises a buffer 50, and the buffer 50 is arranged between adjacent battery monomers 11 along the second direction. In the projection plane perpendicular to the first direction, the projection of the flexible segment 322 at least partially overlaps the projection of the buffer 50.

[0130] Here, the buffer 50 is mainly used to absorb the stress between adjacent battery monomers 11 along the second direction. As an example, the buffer 50 is an elastic pad structure.

[0131] In this embodiment, the buffer 50 is arranged between adjacent battery monomers 11 along the second direction, which helps to further improve the use reliability of the battery device 100. Further, the projection of the flexible segment 322 at least partially overlaps the projection of the buffer 50, so that through the cooperation of the flexible segment 322 and the buffer 50, the stress absorption effect can be further improved.

[0132] In some embodiments, referring to Figure 6 , the rigid member 32 is provided with a flexible segment 322 at least at one end along the second direction, and the flexible segment 322 arranged at the end of the rigid member 32 along the second direction has an inlet and / or outlet communicating with the medium flow channel 33.

[0133] Here, the rigid member 32 can have only one end provided with a flexible segment 322, which can have one of the inlet and / or outlet, or both.

[0134] Alternatively, both ends of the rigid member 32 are provided with a flexible segment 322, one end of which has an inlet and the other end of which has an outlet.

[0135] It can be understood that, in actual use, the inlet and outlet of the heat exchange assembly 30 need to be connected with pipelines (for example, the inlet pipeline 60 and the outlet pipeline 70 in FIG. 1) for conveying the heat exchange medium, and thus, the stress at the positions where the inlet and the outlet are located is different from the stress at the positions (the positions in contact with the battery monomer 11) other than the positions where the inlet and the outlet are located. The stress difference may, in addition to causing the heat exchange assembly 30 to deform and / or disengage from the battery monomer 11, also cause the heat exchange assembly 30 to be disconnected from the pipelines and thus cause the heat exchange medium to leak. Figure 2

[0136] In the embodiment, by providing the flexible section 322 at the end of the rigid member 32 and arranging the inlet and the outlet on the flexible section 322, the stress difference between the positions of the heat exchange assembly 30 for connecting with the pipelines and the other positions can be absorbed, so as to reduce the probability of the heat exchange assembly 30 deforming and / or disengaging from the battery monomer 11 and reduce the probability of the heat exchange assembly 30 being disconnected from the pipelines and thus causing the heat exchange medium to leak.

[0137] It should be noted that, in the embodiment, the rigid member 32 can include a plurality of rigid sections 321 corresponding to the battery monomers one by one as described above. In this case, the flexible section 322 is arranged between adjacent rigid sections 321, and at least one end of the rigid member 32 in the second direction is also provided with the flexible section 322. Alternatively, in the embodiment, the rigid member 32 can include only one rigid section 321, which covers all the battery monomers 11 distributed in the second direction. At least one end of the rigid section 321 in the second direction is provided with the flexible section 322.

[0138] It should be further noted that, in some embodiments, both ends of the rigid member 32 in the second direction can also be rigid sections 321 rather than flexible sections 322.

[0139] In some embodiments, the flexible section 322 includes a metal plasticized film.

[0140] The flexible section 322 is a single-layer or multi-layer film.

[0141] Here, the metal plasticized film is a metal plastic composite material, that is, includes a metal layer and a plastic layer.

[0142] In the embodiment, since the metal plasticized film has a small thickness and a small weight, it is not affected by the extrusion process and does not have to meet a large thickness requirement, so that the thickness and the weight of the heat exchange assembly 30 as a whole can be reduced.

[0143] In some embodiments, the flexible section 322 includes an aluminum plastic film.

[0144] ​The aluminum-plastic film has high barrier property, good cold stamping formability, puncture resistance, electrolyte resistance, and electrical insulation.

[0145] In some embodiments, the flexible section 322 is a layered structure, and the flexible section 322 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are sequentially stacked along the first direction.

[0146] Here, the flexible section 322 includes the metal layer and the non-metal layer, that is, the composite material piece composed of the metal layer and the non-metal layer.

[0147] As an example, the metal layer and the non-metal layer can be formed by hot pressing or hot melting.

[0148] The number of the metal layer and the non-metal layer is not limited.

[0149] In the embodiment, the flexible section 322 sequentially stacked by the metal layer and the non-metal layer has a small thickness and a small weight, and is not affected by the extrusion process, and does not need to meet the requirement of a large thickness, so that the thickness and the weight of the heat exchange assembly 30 as a whole can be reduced. In addition, the heat exchange assembly 30 does not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0150] In some embodiments, the metal layer includes one or more of an aluminum foil, a copper foil, and a steel foil.

[0151] By setting the metal layer to be one or more of the aluminum foil, the copper foil, and the steel foil, the flexible section 322 can have a certain structural strength and can play an isolation role.

[0152] In some embodiments, the non-metal layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0153] By setting the non-metal layer to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible section 322 can have a certain waterproof effect.

[0154] As an example, the non-metal layer can also be selected to be a corrosion-resistant material having acid and alkali corrosion resistance, or an additive can be added to the non-metal layer to make the non-metal layer have acid and alkali corrosion resistance.

[0155] In some embodiments, the non-metal layer is a hot melt layer.

[0156] In the embodiment, by setting the non-metal layer to be a hot melt layer, that is, the hot melt material, it is beneficial to hot melt to make the non-metal layer and the metal layer composite together, and the molding is simple and the production efficiency is high.

[0157] In some embodiments, the flexible section 322 has an elastic modulus of 0.1 MPa to 10000 MPa.

[0158] As an example, the flexible section 322 can have an elastic modulus 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 any point value between any two of them.

[0159] The elastic modulus describes the size of the unit strain caused by the unit stress when the solid is stressed within a certain range, and is one of the basic physical quantities of materials. The greater the elastic modulus, the greater the stiffness of the material, and the stronger the compression resistance. The elastic modulus is a physical quantity that describes the elasticity of a substance.

[0160] The measurement method of the elastic modulus of the flexible section 322 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.

[0161] As an example, the elastic modulus of the flexible section 322 can be measured by the nanoindentation method at room temperature and pressure. The nanoindentation method uses a small indenter to make an indentation on the surface of the flexible section 322, and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0162] In this embodiment, by setting the elastic modulus of the flexible section 322 to 0.1 MPa to 10000 MPa, the flexible section 322 is made to have a certain structural strength, improving the reliability of the heat exchange assembly 30, and also has a certain deformation ability, thereby improving its stress absorption capacity.

[0163] In some embodiments, the flexible section 322 has a greater elongation at break than the rigid section 321. The elongation at break is a percentage index of the elongation to the original length when the material is stretched to break. It is used to measure the deformation capacity that the material can withstand during stretching, i.e. the elongation at break represents the ductility of the material when it is stretched under stress.

[0164] The breaking elongation of the flexible section 322 is greater than the breaking elongation of the rigid section 321, in other words, the ductility of the flexible section 322 is greater than the ductility of the rigid section 321 when being stretched under force.

[0165] In some embodiments, the breaking elongation of the flexible section 322 is in the range of 30% to 300%.

[0166] The breaking elongation of the flexible section 322 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.

[0167] In this embodiment, by setting the breaking elongation of the flexible section 322 in the range of 30% to 300%, the flexible section 322 can have certain impact resistance and puncture resistance while having certain structural strength.

[0168] In some embodiments, the breaking elongation of the rigid section 321 is in the range of 1% to 50%.

[0169] The breaking elongation of the rigid section 321 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.

[0170] In this embodiment, by setting the breaking elongation of the rigid section 321 in the range of 1% to 50%, the rigid section 321 can have sufficient structural strength, thereby facilitating to improve the overall structural strength of the heat exchange assembly 30.

[0171] In some embodiments, with reference to Figure 5 As mentioned above, the at least one heat exchange assembly 30 is a first heat exchange assembly 30a, and the at least one heat exchange piece of the first heat exchange assembly 30a is set as the flexible piece 31.

[0172] That is, in this embodiment, the at least one heat exchange piece of the first heat exchange assembly 30a is set as the rigid piece 32, and the at least one heat exchange piece is set as the flexible piece 31.

[0173] As an example, the first heat exchange assembly 30a includes two heat exchange pieces, one of which is a flexible piece 31 and the other is a rigid piece 32. As an example, the first heat exchange assembly 30a includes three or more heat exchange pieces, at least two of which are flexible pieces 31 or at least two of which are rigid pieces 32, and the flexible pieces 31 and the rigid pieces 32 are arranged alternately.

[0174] In this embodiment, the connection manner of the rigid piece 32 and the flexible piece 31 is not limited, and can be, for example, bonding, welding, or the like.

[0175] In this embodiment, at least one heat exchange piece of the first heat exchange assembly 30a is arranged as the flexible piece 31. The flexible piece 31 is relatively light in weight, which is conducive to reducing the weight of the heat exchange assembly 30 and further improving the energy density of the battery device 100. On the other hand, the flexible piece 31 has a certain flexibility, which can make the heat exchange assembly 30 better conform to the case 20 and / or the battery monomer 11, and improve the thermal management efficiency. On the other hand, the flexible piece 31 can absorb the expansion force of the battery monomer 11 through deformation, and in particular in the case of thermal runaway of the battery monomer 11, the flexible piece 31 can reduce the transmission of the expansion force to the adjacent battery monomer 11, and reduce the probability of thermal runaway diffusion.

[0176] In some embodiments, referring to Figure 2 The case 20 includes two side beams 21 arranged opposite to each other along the first direction, and the side beams 21 are used to constrain the battery monomer group 10. The heat exchange assembly 30 arranged between the battery monomer 11 at the end of the battery monomer group 10 along the first direction and the side beam 21 is the first heat exchange assembly 30a.

[0177] Here, the side beam 21 is also commonly referred to as the expansion beam of the case 20. The side beam 21 is used to constrain the battery monomer group 10 along the first direction and bear the expansion force from the battery monomer 11.

[0178] It can be understood that the heat exchange assembly 30 between the two battery monomers 11 at the two ends of the battery monomer group 10 along the first direction and the corresponding side beam 21 is the first heat exchange assembly 30a.

[0179] In this embodiment, the heat exchange assembly 30 arranged between the battery monomer group 10 and the side beam 21 is the first heat exchange assembly 30a. In this way, the first heat exchange assembly 30a will be able to reduce the transmission of the expansion force of the battery monomer 11 to the side beam 21 of the case 20, thereby helping to improve the deformation resistance of the side beam 21 and further improving the use reliability of the battery device 100.

[0180] In some embodiments, in the first heat exchange assembly 30a arranged between the battery monomer 11 at the end of the battery monomer group 10 along the first direction and the side beam 21, the rigid piece 32 is arranged on the side facing the battery monomer 11.

[0181] In this way, the support capability of the first heat exchange assembly 30a for the battery cell 11 can be improved, and the stress uniformity of the battery cell 11 can be improved.

[0182] In some embodiments, referring to Figure 2 , the battery device 100 comprises a fixing member 40, the fixing member 40 connects the first heat exchange assembly 30a and the side beam 21.

[0183] Here, the specific structure of the fixing member 40 is not limited, as long as it can realize the relative fixation between the first heat exchange assembly 30a and the side beam 21.

[0184] In this embodiment, by arranging the fixing member 40, the stability of the relative position between the first heat exchange assembly 30a and the side beam 21 can be improved, and the possibility that the first heat exchange assembly 30a is separated from the battery cell 11 due to displacement can be reduced, thereby helping to further improve the reliability of heat management.

[0185] In some embodiments, referring to Figure 2 , along the first direction, the fixing member 40 forms an abutting plane 40a on the side facing the first heat exchange assembly 30a, and the other side is fixedly connected with the side beam 21.

[0186] As an example, in the projection plane perpendicular to the first direction, the projection of the abutting plane 40a covers the projection of the first heat exchange assembly 30a.

[0187] The abutting plane 40a and the first heat exchange assembly 30a can only abut and not be fixedly connected, or the abutting plane 40a can be connected to the first heat exchange assembly 30a by bonding, welding, etc.

[0188] The specific implementation mode of the fixed connection between the fixing member 40 and the side beam 21 is not limited, which can be bonding, welding, clamping, fastener connection, etc. The fixing member 40 and the side beam 21 can be directly connected, or only connected through other intermediate structures.

[0189] In this embodiment, by forming the abutting plane 40a on the side of the fixing member 40 facing the first heat exchange assembly 30a, stable and uniform support force can be provided for the first heat exchange assembly 30a, the deformation resistance of the first heat exchange assembly 30a can be improved, and the use reliability of the battery device 100 can be further improved.

[0190] In some embodiments, at least one first heat exchange assembly 30a can be arranged between adjacent battery cells 11 along the first direction.

[0191] In the embodiment, the specific orientation of the rigid member 32 and the flexible member 31 of each first heat exchange assembly 30a arranged between adjacent battery monomers 11 is not limited, and the orientations of the rigid members 32 of the first heat exchange assemblies 30a can be the same or different.

[0192] In the embodiment, at least one first heat exchange assembly 30a is arranged between adjacent battery monomers 11 along the first direction, and the first heat exchange assembly 30a can be closely attached to the adjacent two battery monomers 11 by the deformation of the flexible member 31, thereby achieving a better heat exchange effect and improving the thermal management efficiency. Further, the first heat exchange assembly 30a can block the transmission of the expansion force of the battery monomer 11 to the adjacent battery monomer 11 to some extent, especially in the case of thermal runaway, which can reduce the probability of the expansion force of the thermal runaway battery monomer 11 being transmitted to the adjacent battery monomer 11 and causing damage to the adjacent battery monomer 11, that is, reduce the probability of thermal runaway diffusion, and improve the use reliability of the battery device 100.

[0193] In some embodiments, referring to Figure 5 , the first heat exchange assembly 30a includes a support body 34 arranged in the medium flow channel 33.

[0194] Here, the specific structure of the support body 34 is not limited, and the support body 34 can be a rigid structure or a flexible structure. For example, the elastic modulus of the support body 34 is greater than the elastic modulus of the flexible member 31 and less than the elastic modulus of the rigid member 32.

[0195] It can be understood that a gap needs to be formed between the support body 34 and the flow channel wall of the medium flow channel 33 for the medium to flow. For example, the support body 34 is a strip structure as a whole, and the axis is substantially parallel to the central axis of the medium flow channel 33. At least one end of the support body 34 along the first direction can abut against the heat exchange member, or the opposite ends of the support body 34 along the first direction can abut against the two heat exchange members, respectively, thereby improving the support effect.

[0196] In the embodiment, by arranging the support body 34 in the medium flow channel 33, the possibility that the effective cross-sectional area (the area of the cross section perpendicular to the flow direction of the heat exchange medium) of the medium flow channel 33 is reduced or even completely closed due to the deformation of the flexible member 31 of the first heat exchange assembly 30a under pressure can be reduced, thereby improving the reliability of thermal management.

[0197] In some embodiments, at least one end of the support body 34 is fixed to the heat exchange member along the first direction.

[0198] Here, the specific implementation of the fixation of the support body 34 to the heat exchange member is not limited, such as bonding, clamping, welding, etc., or the support body 34 and the heat exchange member are formed as an integral structure.

[0199] The support body 34 can have only one end fixed to the heat exchange member in the first direction, or both ends fixed to the heat exchange member. In comparison, fixing one end of the support body 34 to the heat exchange member and leaving the other end unfixed to the heat exchange member can help reduce assembly difficulty.

[0200] In the embodiment, by fixing at least one end of the support body 34 to the heat exchange member, the position stability of the support body 34 in the medium flow channel 33 can be improved, and the possibility of position change of the support body 34 during the flow of the heat exchange medium and the resulting resistance can be reduced.

[0201] In some embodiments, referring to Figure 5 , the support body 34 includes a columnar portion 341 and a connecting portion 342 connected to the columnar portion 341. In the first direction, at least one side of the columnar portion 341 is provided with the connecting portion 342, and the connecting portion 342 has a connecting plane arranged towards the heat exchange member.

[0202] In the embodiment, the central axis of the columnar portion 341 coincides with or is parallel to the central axis of the heat exchange medium.

[0203] Here, the connecting portion 342 can be arranged on one side of the columnar portion 341 in the first direction, or the connecting portion 342 can be arranged on both sides of the columnar portion 341 in the first direction. The connecting plane of the connecting portion 342 can abut against the heat exchange member, or can be further fixed relative to the heat exchange member. The fixed manner is not limited, such as bonding, welding, etc.

[0204] As an example, in the case where the connecting portion 342 is arranged on both sides of the columnar portion 341 in the first direction, the connecting plane of one of the connecting portions 342 abuts against the heat exchange member without being fixed relative to the heat exchange member, and the connecting plane of the other connecting portion 342 is fixed relative to the heat exchange member. In this way, assembly difficulty is reduced.

[0205] In the embodiment, the support body 34 includes a columnar portion 341 and a connecting portion 342. The columnar portion 341 helps reduce the resistance of the heat exchange medium flow and improve the heat exchange effect, and the connecting portion 342 has a connecting plane that helps improve the connection strength of the support body 34 and the heat exchange member.

[0206] In some embodiments, the support body 34 is a resilient structure.

[0207] Here, the support body 34 being a resilient structure means that at least a part of the support body 34 is a resilient structure. In the above embodiment where the support body 34 includes a columnar portion 341 and a connecting portion 342, the columnar portion 341 is a resilient structure, and the connecting portion 342 can be a rigid structure or a resilient structure.

[0208] As an example, the elastic structure herein refers to a structure with an elastic modulus higher than that of the flexible piece 31 and lower than that of the rigid piece 32.

[0209] In this embodiment, the support body 34 is an elastic structure, which can provide support for the flexible piece 31 and also deforms with the flexible piece 31, thus absorbing the expansion force.

[0210] In some embodiments, at least one heat exchange assembly 30 is a second heat exchange assembly 30b, and each heat exchange assembly 30 of the second heat exchange assembly 30b is provided as a rigid piece 32.

[0211] In this embodiment, each heat exchange assembly 30 of the second heat exchange assembly 30b is provided as a rigid piece 32, so that better support and positioning can be provided for the battery monomer 11, and the stability of the position of each battery monomer 11 in actual use can be improved.

[0212] It should be noted that each heat exchange assembly 30 of the battery device 100 can be a first heat exchange assembly 30a, a second heat exchange assembly 30b, or a combination of the first heat exchange assembly 30a and the second heat exchange assembly 30b.

[0213] In some embodiments, each battery monomer 11 is provided with heat exchange assemblies 30 on opposite sides along the first direction, wherein at least one heat exchange assembly 30 is provided as a first heat exchange assembly 30a, and at least one heat exchange assembly 30 is provided as a second heat exchange assembly 30b.

[0214] Each battery monomer 11 is provided with heat exchange assemblies 30 on opposite sides along the first direction, that is, heat exchange assemblies 30 are provided between adjacent battery monomers 11 along the first direction, and heat exchange assemblies 30 are also provided between the battery monomers 11 at the end and the box 20. In this way, the contact area of the heat exchange assemblies 30 and the battery monomers 11 is as large as possible, and the heat exchange efficiency is improved.

[0215] In this application, it is proposed that when each battery monomer 11 is provided with heat exchange assemblies 30 on opposite sides along the first direction, if all the heat exchange assemblies 30 are provided as first heat exchange assemblies 30a, the pressure received by each first heat exchange assembly 30a will have a large difference after the flexible piece 31 of a part of the first heat exchange assemblies 30a is deformed under pressure, which may cause the flexible piece 31 of some first heat exchange assemblies 30a to be out of contact with the battery monomer 11 and unable to complete effective heat exchange.

[0216] To this end, in the embodiment, at least one heat exchange assembly 30 is arranged as a first heat exchange assembly 30a, and at least one heat exchange assembly 30 is arranged as a second heat exchange assembly 30b. In this way, the second heat exchange assembly 30b can play a role of supplementing support and limiting, reducing the possibility that the flexible piece 31 of the first heat exchange assembly 30a is deformed to cause the heat exchange assembly 30 to be out of contact with the battery monomer 11, and thus improving the reliability of thermal management.

[0217] In the embodiment, the specific arrangement positions of the first heat exchange assembly 30a and the second heat exchange assembly 30b are not limited, and a person skilled in the art can select whether to use the first heat exchange assembly 30a or the second heat exchange assembly 30b according to the stress distribution at each position in the actual use process.

[0218] In the battery device 100 provided by the embodiment, the heat exchange assemblies 30 are arranged on both sides of the battery monomer 11 along the first direction, so that the heat exchange area of the battery monomer 11 and the heat exchange assembly 30 is improved, and thus the thermal management efficiency is improved, and the rapid cooling in the case of thermal runaway is facilitated.

[0219] On the other hand, at least one heat exchange piece of the first heat exchange assembly 30a is arranged as a flexible piece 31, and the flexible piece 31 is relatively light in weight, which is conducive to reducing the weight of the heat exchange assembly 30, and thus improving the energy density of the battery device 100.

[0220] In another aspect, the flexible piece 31 has a certain flexibility, which can make the heat exchange assembly 30 better fit the box body 20 and / or the battery monomer 11, improve the thermal management efficiency, and the flexible piece 31 can absorb the expansion force of the battery monomer 11 through deformation, especially in the case of thermal runaway of the battery monomer 11, the flexible piece 31 can reduce the transmission of the expansion force to the adjacent battery monomer 11, and reduce the probability of thermal runaway diffusion.

[0221] In another aspect, each heat exchange piece of the second heat exchange assembly 30b is arranged as a rigid piece 32, and in the case that the flexible piece 31 in the first heat exchange assembly 30a is deformed under pressure, the second heat exchange assembly 30b can provide support force and certain limiting effect for the battery monomer 11, reduce the possibility that part of the heat exchange assembly 30 is out of contact with the battery monomer 11 due to the deformation of the flexible piece 31, and thus help to improve the reliability of thermal management, especially in the case of thermal runaway, help to maintain effective heat dissipation for the battery monomer 11.

[0222] In some embodiments, referring to Figure 2 , the second heat exchange assembly 30b is arranged on at least one side of each battery monomer 11 along the first direction.

[0223] Here, the second heat exchange assembly 30b is arranged on at least one side of each battery monomer 11 along the first direction, specifically, at least one of the two heat exchange assemblies 30 arranged on the opposite sides of each battery monomer 11 along the first direction is the second heat exchange assembly 30b, and the other can be the first heat exchange assembly 30a or the second heat exchange assembly 30b, which is not limited.

[0224] In the embodiment, by arranging the second heat exchange assembly 30b on at least one side of each battery monomer 11 along the first direction, at least one side of each battery monomer 11 along the first direction can be provided with relatively stable support force, and the possibility that both sides of the battery monomer 11 along the first direction are separated from the heat exchange assembly 30 is avoided as much as possible, thereby further improving the reliability of heat management.

[0225] In some embodiments, referring to Figure 2 , the first heat exchange assembly 30a and the second heat exchange assembly 30b are arranged alternately along the first direction.

[0226] In the embodiment, each battery monomer 11 can be provided with the first heat exchange assembly 30a on one side along the first direction and the second heat exchange assembly 30b on the other side, thereby helping to balance the absorption of the expansion force and the stability of the support, thereby further improving the reliability of heat management.

[0227] In some embodiments, referring to Figure 2 , the heat exchange assembly 30 has an inlet piece 35 and an outlet piece 36 in communication with the medium flow channel 33, and the inlet piece 35 and the outlet piece 36 are arranged on the opposite sides of the heat exchange assembly 30 along the second direction, and the second direction intersects the first direction.

[0228] Here, the inlet piece 35 and the outlet piece 36 are respectively used for the heat exchange medium to flow into and out of the medium flow channel 33, and as an example, the inlet piece 35 and the outlet piece 36 include a water nozzle.

[0229] In the embodiment, by arranging the inlet piece 35 and the outlet piece 36 on the opposite sides of the heat exchange assembly 30 along the second direction, it is helpful to reduce the difficulty of pipeline arrangement in the box body 20.

[0230] It should be noted that in some other embodiments, the inlet piece 35 and the outlet piece 36 can also be located on the same side.

[0231] In some embodiments, still referring to Figure 2 , the battery device 100 includes an inlet pipeline 60 and an outlet pipeline 70, the inlet pipeline 60 is connected in series with the inlet pieces 35 of the heat exchange assemblies 30, and the outlet pipeline 70 is connected in series with the outlet pieces 36 of the heat exchange assemblies 30, and the inlet end 61 of the inlet pipeline 60 and the outlet end 71 of the outlet pipeline 70 are located on the same side of the battery monomer group 10 along the first direction.

[0232] Here, the inlet pipe 60 connecting the inlet piece 35 of each heat exchange assembly 30 in series specifically means that the inlet pipe 60 connects the inlet piece 35 of the heat exchange assembly 30 with the inlet piece 35 of another heat exchange assembly 30 adjacent thereto. The outlet pipe 70 connecting the outlet piece 36 of each heat exchange assembly 30 in series specifically means that the outlet pipe 70 connects the outlet piece 36 of the heat exchange assembly 30 with the outlet piece 36 of another heat exchange assembly 30 adjacent thereto.

[0233] The inlet end 61 of the inlet pipe 60 specifically means one end of the inlet pipe 60 through which the heat exchange medium flows in, and the outlet end 71 of the outlet pipe 70 specifically means one end of the outlet pipe 70 through which the heat exchange medium flows out.

[0234] The inlet end 61 and the outlet end 71 are specifically arranged between the first heat exchange assembly 30a and the side beam 21, and in the embodiment in which the battery device 100 includes the fixing member 40, the inlet end 61 and the outlet end 71 are specifically arranged between the fixing member 40 and the side beam 21.

[0235] In this embodiment, this pipe connection manner helps to make the temperature of the heat exchange medium entering each heat exchange assembly 30 substantially the same, and thus helps to provide better heat dissipation for each battery monomer 11 in the first direction, improving the uniformity of the temperature of the battery monomer 11. Further, this pipe connection manner can realize that the inlet end 61 and the outlet end 71 are located on the same side of the battery monomer 11, i.e., on the same side of the box body 20, and thus facilitates connection with the external heat exchange medium source in actual use.

[0236] In some embodiments, the flexible member 31 includes a metal plasticized film.

[0237] The flexible member 31 is a single-layer or multi-layer film.

[0238] Here, the metal plasticized film is a metal plastic composite material, i.e., including a metal layer and a plastic layer, and the plastic layer forms the above-mentioned insulating layer.

[0239] In this embodiment, since the metal plasticized film has a thin thickness and a small weight, and a medium flow channel 33 is formed between the metal plasticized film and the heat exchange member, it is not affected by the extrusion process and does not have to meet the requirement of a large thickness, so the thickness and weight of the heat exchange assembly 30 as a whole can be reduced.

[0240] In some embodiments, the flexible member 31 includes an aluminum plastic film.

[0241] The aluminum plastic film has high barrier property, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0242] In some embodiments, the flexible member 31 has a layered structure, and the flexible member 31 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are arranged in sequence.

[0243] Here, the flexible member 31 includes a metal layer and a non-metal layer, i.e., is a composite member composed of the metal layer and the non-metal layer.

[0244] As an example, the metal layer and the non-metal layer can be formed by hot pressing or hot melting.

[0245] The number of the metal layer and the non-metal layer is not limited.

[0246] In this embodiment, the flexible member 31 composed of the metal layer and the non-metal layer is thin in thickness and light in weight, is not affected by the extrusion process, does not need to meet the requirement of a large thickness, and thus can reduce the thickness and weight of the heat exchange assembly 30 as a whole. In addition, the heat exchange assembly 30 does not react with the heat exchange medium flowing inside, and thus there is no possibility of corrosion and leakage.

[0247] In some embodiments, the metal layer includes one or more of an aluminum foil, a copper foil, and a steel foil.

[0248] By setting the metal layer to be one or more of an aluminum foil, a copper foil, and a steel foil, the flexible member 31 can have a certain structural strength and can play an isolation role.

[0249] In some embodiments, the non-metal layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0250] By setting the non-metal layer to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible member 31 can have a certain waterproof effect.

[0251] As an example, the non-metal layer can also be selected to be a corrosion-resistant material having acid and alkali corrosion resistance, or additives can be added to the non-metal layer to make the non-metal layer have acid and alkali corrosion resistance.

[0252] In some embodiments, the non-metal layer is a hot melt layer.

[0253] In this embodiment, by setting the non-metal layer to be a hot melt layer, i.e., composed of a hot melt material, it is beneficial to hot melt the non-metal layer and the metal layer together, which is simple in forming and high in production efficiency.

[0254] In some embodiments, the thickness of the flexible member 31 is 0.05mm-0.3mm.

[0255] As an example, the thickness of the flexible member 31 can be any one of or any value between 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.15mm, 0.2mm, 0.21mm, 0.22mm, 0.25mm, 0.27mm, 0.28mm, 0.3mm.

[0256] In this embodiment, by setting the thickness of the flexible member 31 to be 0.05mm-0.3mm, the heat exchange assembly 30 made of the flexible member 31 has a certain structural strength while the overall thickness of the heat exchange assembly 30 is small, which is conducive to reducing the overall volume and weight of the battery device 100 to increase the energy density of the battery device 100.

[0257] In some embodiments, the thickness of the flexible member 31 is 0.08mm-0.2mm.

[0258] As an example, the thickness of the flexible member 31 can be any one of or any value between 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm.

[0259] In this embodiment, by setting the thickness of the flexible member 31 to be 0.08mm-0.2mm, the heat exchange assembly 30 made of the flexible member 31 has a certain structural strength while the overall thickness of the heat exchange assembly 30 is small, which is conducive to further reducing the overall volume and weight of the battery device 100 to further increase the energy density of the battery device 100.

[0260] In some embodiments, the elastic modulus of the flexible member 31 is 0.1MPa-10000MPa.

[0261] As an example, the elastic modulus of the flexible member 31 can be any one of or any value between 0.1MPa, 1MPa, 50MPa, 100MPa, 150MPa, 200MPa, 300MPa, 500MPa, 800MPa, 1000MPa, 1300MPa, 1500MPa, 1800MPa, 2000MPa, 2500MPa, 2800MPa, 3000MPa, 3500MPa, 4000MPa, 4500MPa, 5000MPa, 5500MPa, 6000MPa, 6500MPa, 7000MPa, 7500MPa, 8000MPa, 8500MPa, 8800MPa, 9000MPa, 9500MPa, 9700MPa, 10000MPa.

[0262] Elastic modulus describes the size of unit strain caused by unit stress when a solid is stressed within a certain range, and is one of the basic physical quantities of a material. The greater the elastic modulus, the greater the stiffness of the material, and the stronger the compression resistance. Elastic modulus is a physical quantity that describes the elasticity of a substance.

[0263] The measurement 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.

[0264] Exemplarily, the elastic modulus of the flexible member 31 can be measured by the nanoindentation method at normal temperature and pressure. The nanoindentation method uses a small indenter to make an indentation on the surface of the flexible member 31, and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0265] In this embodiment, by setting the elastic modulus of the flexible member 31 to 0.1 MPa-10000 MPa, the flexible member 31 is made to have a certain structural strength, improving the reliability of the heat exchange assembly 30, and also has a certain deformation ability, which can improve the fit of the heat exchange assembly 30 with the box body 20 and / or the battery monomer 11, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the box body 20 and / or the battery monomer 11, and thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30.

[0266] In some embodiments, the breaking elongation of the flexible member 31 is greater than the breaking elongation of the rigid member 32. The breaking elongation is a percentage index of the elongation amount to the original length when the material is stretched to break. It is used to measure the deformation ability that the material can withstand during stretching, that is, the breaking elongation represents the ductility of the material when it is stretched under stress.

[0267] The breaking elongation of the flexible member 31 is greater than the breaking elongation of the rigid member 32, in other words, the ductility of the flexible member 31 is greater than the ductility of the rigid member 32 when stretched under stress.

[0268] In some embodiments, the breaking elongation of the flexible member 31 is in the range of 30% to 300%.

[0269] 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.

[0270] In the embodiment, by setting the breaking elongation of the flexible member 31 in the range of 30% to 300%, the flexible member 31 has certain impact resistance and puncture resistance, and also has certain structural strength.

[0271] In some embodiments, the breaking elongation of the rigid member 32 is in the range of 1% to 50%.

[0272] The breaking elongation of the rigid member 32 can be 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 value between any two of them.

[0273] In the embodiment, by setting the breaking elongation of the rigid member 32 in the range of 1% to 50%, the rigid member 32 has sufficient structural strength, thereby facilitating to improve the overall structural strength of the heat exchange assembly 30.

[0274] In some embodiments, the rigid member 32 is set as a metal plate.

[0275] As an example, the rigid member 32 can be an aluminum alloy plate, and the outer surface thereof can be insulated.

[0276] In the embodiment, by setting the rigid member 32 as a metal plate, the metal plate has good structural strength and good heat conduction performance.

[0277] The following further illustrates the battery device 100 provided by the embodiments of the application with a specific embodiment.

[0278] With reference to Figures 2-6 , the battery device 100 includes a box body 20, a battery monomer group 10, and a heat exchange assembly 30. The battery monomer group 10 is arranged in the box body 20. The battery monomer group 10 includes a plurality of battery monomers 11 arranged in a first direction, and as an example, the first direction is perpendicular to the large surface of the battery monomer 11. A plurality of battery monomer groups 10 are distributed along a second direction to form an array of battery monomers 11, where the second direction intersects the first direction, and both the first direction and the second direction are perpendicular to the height direction of the box body 20.

[0279] The heat exchange assembly 30 is arranged on one side of the battery monomer 11 along the first direction, and the heat exchange assembly 30 includes at least two heat exchange members arranged in a first direction to form at least one medium flow channel 33, and the at least one medium flow channel 33 is used to guide the heat exchange medium, and the heat exchange medium is used to exchange heat with the battery monomer 11.

[0280] The at least one heat exchange member is arranged as a rigid member 32, which comprises at least one rigid segment 321 and at least one flexible segment 322 connected to the rigid segment 321 along the second direction.

[0281] Specifically, the rigid member 32 comprises a plurality of rigid segments 321 arranged one-to-one corresponding to the battery monomers 11, and the flexible segment 322 is arranged between adjacent two rigid segments 321 along the second direction, and the buffer member 50 is arranged between adjacent two battery monomers 11.

[0282] In a projection plane perpendicular to the first direction, along the second direction, two ends of the projection of the rigid segment 321 are flush with two ends of the projection of the corresponding battery monomer 11, or the two ends of the projection of the rigid segment 321 exceed the two ends of the projection of the corresponding battery monomer 11, and the projection of the flexible segment 322 at least partially overlaps the projection of the buffer member 50.

[0283] In some embodiments, the rigid member 32 also has the flexible segment 322 at opposite ends along the second direction, and the flexible segment 322 at one end has an inlet communicated with the medium flow channel 33, and the flexible segment 322 at the other end has an outlet communicated with the medium flow channel 33.

[0284] The embodiments of the present application also provide a heat exchange assembly 30, which comprises at least two heat exchange members, the at least two heat exchange members are arranged in a stack along a first direction to form at least one medium flow channel 33, the at least one medium flow channel 33 is used to guide a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery monomer 11, wherein the at least one heat exchange member is arranged as a rigid member 32, which comprises at least two rigid segments 321 and at least one flexible segment 322 connected to adjacent two rigid segments 321 along a second direction, and the second direction intersects the first direction.

[0285] The embodiments of the present application also provide a power consumption device, which comprises the battery device 100 or the heat exchange assembly 30 as described in any one of the above embodiments.

[0286] The heat exchange assembly 30 and the power consumption device of the embodiments of the present application have all the advantages of the battery device 100 as described in any one of the above embodiments, which will not be repeated here.

[0287] In the description of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine different embodiments or examples described in this application, as well as features of different embodiments or examples.

[0288] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery device, characterized by, The battery device comprises: a battery cell group comprising a plurality of battery cells arranged in a first direction, the first direction being perpendicular to a large surface of the battery cells, the large surface being a surface with the largest area among surfaces of the battery cells, and a plurality of the battery cell groups being distributed along a second direction to form a battery cell array, the first direction intersecting the second direction; a box, the battery cell group being arranged in the box; and a heat exchange assembly arranged on one side of the battery cells along the first direction, the heat exchange assembly comprising at least two heat exchange members arranged in a stack along the first direction to form at least one medium flow channel for conducting a heat exchange medium for heat exchange with the battery cells, wherein at least one of the heat exchange members is arranged as a rigid member, along the second direction, the rigid member comprising at least one rigid segment and at least one flexible segment connected to the rigid segment.

2. The battery device according to claim 1, characterized by The rigid member comprises a plurality of rigid segments, and the flexible segment is arranged between adjacent rigid segments.

3. The battery device of claim 2, wherein, The rigid segment is arranged in one-to-one correspondence with the battery cell.

4. The battery device of claim 3, wherein In a projection plane perpendicular to the first direction, along the second direction, two ends of a projection of the rigid segment are flush with two ends of a projection of the corresponding battery cell group, or the two ends of the projection of the rigid segment exceed the two ends of the projection of the corresponding battery cell group.

5. The battery device of claim 2, wherein Along the second direction, a buffer member is arranged between adjacent two battery cells, and in a projection plane perpendicular to the first direction, a projection of the flexible segment at least partially overlaps a projection of the buffer member.

6. The battery device of claim 1, wherein The rigid member is provided with the flexible segment at at least one end along the second direction, and the flexible segment arranged at an end of the rigid member along the second direction has an inlet and / or an outlet in communication with the medium flow channel.

7. The battery device of claim 1, wherein The flexible segment comprises a metal plasticized film.

8. The battery device of claim 7, wherein, The flexible segment comprises an aluminum plastic film.

9. The battery device of claim 1, wherein, The flexible segment has a layered structure, and comprises a metal layer and a non-metal layer arranged in a stack along the first direction.

10. The battery device of claim 9, wherein, The metal layer comprises one or more of an aluminum foil, a copper foil, and a steel foil; and / or The non-metal layer comprises one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

11. The battery device according to any one of claims 1 to 10, wherein At least one of the heat exchange assemblies is a first heat exchange assembly, and at least one of the heat exchange members of the first heat exchange assembly is arranged as a flexible member.

12. The battery device of claim 11, wherein, The box comprises two side beams arranged opposite along the first direction, the side beams being used to constrain the battery cell group, and the heat exchange assembly arranged between a battery cell at an end of the battery cell group along the first direction and the side beam is the first heat exchange assembly.

13. The battery device of claim 12, wherein, In the first heat exchange assembly arranged between the battery cell at the end of the battery cell group along the first direction and the side beam, the rigid member is arranged on a side facing the battery cell.

14. The battery device of claim 11, wherein, At least one of the first heat exchange assemblies is arranged between adjacent two battery cells along the first direction.

15. The battery device according to any one of claims 1 to 10, wherein At least one of the heat exchange assemblies is a second heat exchange assembly, and each of the heat exchange members of the second heat exchange assembly is arranged as the rigid member.

16. The battery device of claim 15, wherein, The heat exchange assemblies are arranged on opposite sides of each of the battery cells along the first direction, wherein at least one of the heat exchange assemblies is a first heat exchange assembly, and at least one of the heat exchange components of the first heat exchange assembly is a flexible component.

17. The battery device of claim 16, wherein, The first heat exchange assemblies and the second heat exchange assemblies are alternately arranged along the first direction.

18. A heat exchange assembly, characterized by The heat exchange assembly comprises at least two heat exchange components, the at least two heat exchange components are arranged in a stack along a first direction to form at least one medium flow channel, the at least one medium flow channel is used to guide a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cells, wherein, At least one of the heat exchange components is a rigid component, and along a second direction, the rigid component comprises at least one rigid segment and at least one flexible segment connected to the rigid segment, the first direction is perpendicular to a large surface of the battery cell, the large surface is a surface with the largest area among surfaces of the battery cell, and the first direction intersects the second direction.

19. An electrical device, characterized by The power consumption device comprises the battery device of any one of claims 1-17 or the heat exchange assembly of claim 18.

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