Battery device and electric device

Abstract

The embodiment of the invention provides a battery device and a power utilization device. The battery device comprises a box body, a heat management part and a plurality of battery cells, and the plurality of battery monomers are arranged in the accommodating cavity. The heat management part is arranged on the side wall of the box body, the heat management part is used for heating and cooling the plurality of single batteries, and at least partial area of the heat management part is arranged to be of a flexible structure. The battery device further comprises at least one first medium flow channel, and the flexible structure forms at least part of the side wall of the first medium flow channel. The battery device comprises a plurality of states, and in at least one of the plurality of states, the first medium flow channel is filled with a heat insulation medium, and the heat management part is used for carrying out heat insulation on the battery monomers. The influence of the temperature of the box body on the temperature of the battery monomers close to the box body can be reduced, the temperature uniformity of each battery monomer is improved, the performance of the battery device is improved, and the service life of the battery device is prolonged. And the flexible structure is light in weight, so that the production cost of the heat management piece is reduced, and the weight of the battery device is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] In new energy vehicles equipped with battery devices, the battery devices can be used to provide power in whole or in part. During the use of the battery device, there is heat exchange between the battery device housing and the external environment, which may affect the temperature of the battery cells near the edge of the housing, and may further reduce the temperature uniformity of the battery cells of the battery device. The reduction in temperature uniformity will have an adverse effect on the performance and service life of the battery device. Therefore, how to improve the temperature uniformity of battery cells has become an important research direction in this field. Summary of the invention

[0003] In view of this, the embodiments of the present application hope to provide a battery device and an electrical device, which can improve the temperature uniformity of the battery cells to a certain extent.

[0004] To this end, a first aspect of an embodiment of the present application provides a battery device, including: A box body, wherein the box body has a containing cavity inside; A plurality of battery cells, wherein the plurality of battery cells are arranged in the accommodation cavity; A thermal management component, the thermal management component is arranged on the side wall of the box body, the thermal management component is used to heat and cool the multiple battery cells, and at least a part of the thermal management component is set as a flexible structure; the battery device also includes at least one first medium flow channel, and the flexible structure forms at least a part of the side wall of the first medium flow channel; The battery device includes multiple states, and in at least one of the multiple states, the first medium flow channel is filled with a heat-insulating medium, and the heat-management component is used to insulate the battery cell.

[0005] The battery device provided by the embodiment of the present application includes a box, a heat management component and a plurality of battery cells. On the one hand, by arranging the heat management component on the side wall of the box, the heat management component can manage the temperature of the side wall of the box, thereby reducing the influence of the temperature of the box on the temperature of the battery cells close to the box, thereby facilitating the improvement of the temperature uniformity of each battery cell, thereby improving the performance and service life of the battery device. In addition, by arranging at least part of the area of ​​the heat management component as a flexible structure, the weight of the flexible structure is relatively light, which is conducive to reducing the weight of the heat management component, reducing the production cost of the heat management component, and reducing the weight of the battery device; in addition, the flexible structure has a certain degree of flexibility, which can make the heat management component better fit with the box and / or the battery cells, thereby improving the applicability of the heat management component.

[0006] In some embodiments, the first medium flow channel is formed inside the thermal management component; and / or, The first medium flow channel is formed between the heat management component and the side wall of the box body.

[0007] The first medium flow channel may be formed inside the heat management component, which is helpful to improve the manufacturability and sealing performance of the first medium flow channel.

[0008] A first medium flow channel may also be formed between the heat management component and the side wall of the housing. In this way, on the one hand, the material used for the heat management component can be reduced, thereby reducing cost and weight. On the other hand, the medium in the first medium flow channel can be in direct contact with the housing, thereby improving heat exchange efficiency.

[0009] In some embodiments, the battery device includes a first state and a second state different from the first state; In the first state, the first medium flow channel is filled with a heat exchange medium, and the thermal management component is used to exchange heat for the battery cell; in the second state, the first medium flow channel is not filled with the heat exchange medium, and the thermal conductivity of the insulation medium is lower than the thermal conductivity of the heat exchange medium.

[0010] In this embodiment, in the first state, the first medium flow channel is filled with heat exchange medium, and the thermal management component is used to exchange heat with the box body to achieve heating or cooling of the box body, that is, to achieve temperature management of the box body, and indirectly achieve temperature management of the battery cell, which is conducive to improving the temperature uniformity of the battery cell. In the second state, the heat exchange medium in the first medium flow channel is discharged, so that the leakage of the heat exchange medium can be improved, thereby improving the situation where the leaked heat exchange medium slowly penetrates into the battery device, causing insulation failure, or even short circuit and fire of the battery device.

[0011] In some embodiments, the thermal insulation medium includes air.

[0012] In some embodiments, the battery device includes a fourth state and a fifth state different from the fourth state; In the fourth state, the first medium flow channel is filled with the heat insulating medium; in the fifth state, the first medium flow channel is not filled with the heat insulating medium.

[0013] In this embodiment, in the fourth state, the first medium flow channel is filled with a heat-insulating medium, and the thermal management component is used to insulate the box and / or the battery cell, thereby improving the insulation effect of the battery device. In the fifth state, the heat-insulating medium in the first medium flow channel is discharged, so that the leakage of the heat-insulating medium can be improved, thereby improving the situation where the leaked heat-insulating medium slowly penetrates into the battery device, causing insulation failure, or even short circuit and fire of the battery device.

[0014] In some embodiments, the thermal management component further includes a storage component, and the storage component is used to store the medium discharged from the first medium flow channel.

[0015] Here, the specific type of the storage element is not limited. The storage element is a container with a certain volume, which is used to store the medium discharged from the first medium flow channel so that it can be reused.

[0016] In some embodiments, the thermal management component includes a thermal insulation material.

[0017] In this embodiment, by configuring the thermal management component to include a heat insulating material, the thermal management component can block heat exchange between the side wall of the box and the external environment, and / or the thermal management component can block heat exchange between the side wall of the box and the battery cell, thereby improving the temperature uniformity of the battery cell.

[0018] In some embodiments, the thermal management component is disposed in the accommodating cavity, and / or the thermal management component is disposed outside the accommodating cavity.

[0019] In this way, the heat management component can be used to exchange heat with the side wall of the box and / or the battery cell to improve the temperature uniformity of the battery cell, or the heat management component can be used to block the heat exchange between the side wall of the box and the battery cell to improve the temperature uniformity of the battery cell.

[0020] In this way, the side walls of the box can be used for heat exchange through the thermal management component to indirectly manage the temperature of the battery cells, thereby improving the temperature uniformity of the battery cells. Alternatively, the heat exchange between the side walls of the box and the external environment can be blocked through the thermal management component to indirectly manage the temperature of the battery cells, thereby improving the temperature uniformity of the battery cells.

[0021] In some embodiments, the flexible structure is formed on the side wall of the box by heat pressing.

[0022] The connection structure is simple and reliable.

[0023] In some embodiments, the flexible structure includes a metal plasticized film.

[0024] In this embodiment, since the metal plastic film is thin and light in weight, and the first medium flow channel is formed between the metal plastic film and the heat exchanger, it is not affected by the extrusion process and does not need to meet the larger thickness requirement, so the thickness and weight of the heat management component as a whole can be reduced. At the same time, since the heat management component has the characteristics of insulation, the possibility of insulation failure can be reduced. The risk of the heat management component reacting with the heat exchange medium flowing inside is reduced, and the possibility of corrosion and leakage of the heat exchange medium is further reduced.

[0025] In some embodiments, the flexible structure includes an aluminum-plastic film.

[0026] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0027] In some embodiments, the flexible structure is a layered structure, and the flexible structure includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0028] In this embodiment, the flexible structure formed by stacking metal layers and non-metal layers in sequence is thin and light in weight, and by forming a first medium flow channel between the flexible structure and the side wall of the box, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the overall thickness and weight of the thermal management component can be reduced. In addition, the thermal management component will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0029] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil and steel foil.

[0030] By setting the metal layer to be one or more of aluminum foil, copper foil and steel foil, the flexible structure can have a certain structural strength and can play an isolation role.

[0031] In some embodiments, the non-metallic layer includes one or more of polypropylene, polyvinyl chloride and polyethylene.

[0032] By setting the non-metallic layer to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible structure can have a certain waterproof effect.

[0033] In some embodiments, the non-metallic layer is a hot-melt layer.

[0034] Here, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer with the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0035] In some embodiments, the flexible structure is a layered structure, and the flexible structure includes a first anti-corrosion layer, an isolation layer, and a second anti-corrosion layer arranged in sequence, and the first anti-corrosion layer is closer to the first medium flow channel than the second anti-corrosion layer.

[0036] In this embodiment, by configuring the flexible structure to include a first anti-corrosion layer, an isolation layer, and a second anti-corrosion layer arranged in sequence, the second anti-corrosion layer is closer to the first medium flow channel than the first anti-corrosion layer, which is beneficial to improving the reliability of the thermal management component.

[0037] In some embodiments, the thickness of the flexible structure is 0.05 mm-0.3 mm.

[0038] In this embodiment, by setting the thickness of the flexible structure to 0.05mm-0.3mm, the thermal management component made of the flexible structure has a certain structural strength while the overall thickness of the thermal management component is smaller, which is beneficial to reducing the overall volume and weight of the battery device to increase the energy density of the battery device.

[0039] In some embodiments, the thickness of the flexible structure is 0.08 mm-0.2 mm.

[0040] In this embodiment, by setting the thickness of the flexible structure to 0.08mm-0.2mm, the thermal management component made of the flexible structure has a certain structural strength, and the overall thickness of the thermal management component is further reduced, which is beneficial to further reduce the overall volume and weight of the battery device, so as to further increase the energy density of the battery device.

[0041] In some embodiments, the elastic modulus of the flexible structure is 0.1 MPa-10000 MPa.

[0042] In this embodiment, by setting the elastic modulus of the flexible structure to 0.1MPa-10000MPa, the flexible structure can have a certain structural strength, thereby improving the reliability of the thermal management component, and has a certain deformation ability, which can improve the fit between the thermal management component and the housing and / or battery cell, thereby increasing the effective heat exchange area between the thermal management component and the housing and / or battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the thermal management component.

[0043] In some embodiments, the thermal management component includes a flexible component and a rigid component, and the flexible component and the rigid component are located between the battery cell and the side wall of the box body.

[0044] Exemplarily, the flexible member and the rigid member are stacked to form at least one first medium flow channel, which means that the thermal management member forms the first medium flow channel between the flexible member and the rigid member. In other words, the flexible member constitutes at least part of the side wall of the first medium flow channel, and the rigid member also constitutes at least part of the side wall of the first medium flow channel. The heat exchange medium circulates in the first medium flow channel to achieve heat exchange with the battery cell.

[0045] In some embodiments, the battery device also includes the heat exchange component, which is arranged on at least one side of the battery cell along the height direction of the battery device, and the interior of the heat exchange component has at least one second medium flow channel, and the at least one second medium flow channel is used to conduct the heat exchange medium, and the heat exchange medium is used to exchange heat with the multiple battery cells.

[0046] In this embodiment, during the use of the battery device, the battery cells in the battery device will generate heat. By providing a heat exchange component, the battery cells of the battery device can be effectively cooled, which is beneficial to further improve the performance and service life of the battery device.

[0047] In some embodiments, the heat exchange assembly includes at least two heat exchange components, at least one of which is configured as a flexible component, and at least one of which is configured as a rigid component. The elastic modulus of at least a portion of the flexible component is smaller than the elastic modulus of the rigid component, and the flexible component and the rigid component are stacked to form the at least one second medium flow channel.

[0048] In this embodiment, by setting at least one heat exchanger as a flexible part, the weight of the flexible part is relatively light, which is conducive to reducing the weight of the heat exchange assembly, reducing the production cost of the heat exchange assembly, and reducing the weight of the battery device; in addition, the flexible part has a certain flexibility, which can make the heat exchange assembly fit better with the box and / or the battery cell, thereby absorbing the assembly tolerance of the heat exchange assembly, without the need to use a caulking agent or a heat conductive material, improving the fit between the heat exchange assembly and the box and / or the battery cell, and increasing the effective heat exchange area between the heat exchange assembly and the box and / or the battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly. On the other hand, by setting at least one heat exchanger as a rigid part, the flexible part and the rigid part are stacked to form at least one second medium flow channel, and the rigid part can support the flexible part, which is conducive to improving the overall structural strength and stability of the heat exchange assembly, and further improving the heat exchange effect of the heat exchange assembly; in addition, by setting a rigid part, the heat exchange assembly has sufficient structural strength for carrying the battery cell, thereby improving the applicability of the heat exchange assembly.

[0049] A second aspect of an embodiment of the present application provides an electrical device, comprising the battery device described above.

[0050] The battery device of the electric device provided in the embodiment of the present application includes a box, a heat management component and a plurality of battery cells. On the one hand, by arranging the heat management component on the side wall of the box, the heat management component can manage the temperature of the side wall of the box, thereby reducing the influence of the temperature of the box on the temperature of the battery cells close to the box, thereby facilitating the improvement of the temperature uniformity of each battery cell, thereby improving the performance and service life of the battery device. In addition, by arranging at least part of the area of ​​the heat management component as a flexible structure, the weight of the flexible structure is relatively light, which is conducive to reducing the weight of the heat management component, reducing the production cost of the heat management component, and reducing the weight of the battery device; in addition, the flexible structure has a certain degree of flexibility, which can make the heat management component better fit with the box and / or the battery cells, thereby improving the applicability of the heat management component. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present disclosure; Figure 2 A three-dimensional exploded schematic diagram of a battery device provided in one embodiment of the present disclosure; Figure 3 A schematic diagram of the connection structure between a box and a thermal management component provided in one embodiment of the present disclosure; Figure 4 A three-dimensional exploded schematic diagram of a heat exchange assembly provided in one embodiment of the present disclosure; Figure 5 A schematic three-dimensional exploded view of a flexible member provided in one embodiment of the present disclosure.

[0052] Description of Reference Numerals 10. Battery cell; 20. Box; 21. First box portion; 22. Second box portion; 23. Accommodation cavity; 24. Side wall; 30. Heat exchange component; 31. Flexible part; 311. Hot pressing area; 312. Second medium flow channel; 313. First anti-corrosion layer; 314. Isolation layer; 315. Second anti-corrosion layer; 32. Rigid part; 33. Connecting part; 40. Thermal management part; 41. First medium flow channel; 42. Inlet; 43. Outlet; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. DETAILED DESCRIPTION

[0053] If not otherwise specified, all embodiments and optional embodiments of the present disclosure may be combined with each other to form a new technical solution.

[0054] Unless otherwise specified, all technical features and optional technical features of the present disclosure can be combined with each other to form a new technical solution.

[0055] With the development of clean energy, more and more devices use electric energy as driving energy, and then power batteries that can store more electric energy and can be charged and discharged repeatedly are developing rapidly, such as lithium-ion batteries. Among them, power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields.

[0056] In the embodiment of the present disclosure, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0057] The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., but the embodiments of the present disclosure are not limited thereto.

[0058] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0059] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0060] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0061] In some embodiments, the electrode assembly is a laminate structure.

[0062] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0063] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0064] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0065] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0066] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0067] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0068] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0069] In some embodiments, the battery cell may include a shell. The shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0070] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no particular limitation in the present disclosure.

[0071] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0072] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collecting member. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0073] In some embodiments, the energy storage equipment includes an energy storage container, an energy storage cabinet, etc.

[0074] In the related art, during the use of the battery device, the box of the battery device exchanges heat with the air of the external environment, which may cause the temperature of the box to be too high or too low, and the battery cells near the edge of the box will exchange heat with the box, which will affect the temperature of the battery cells near the edge of the box, and may further reduce the temperature uniformity of the battery cells of the battery device. The reduction in temperature uniformity will have an adverse effect on the performance and service life of the battery device.

[0075] In view of this, in order to improve the temperature uniformity of the battery cells, an embodiment of the present disclosure provides a battery device, which includes a housing, a thermal management component and a plurality of battery cells. The plurality of battery cells are arranged in a receiving cavity. The thermal management component is arranged on the side wall of the housing, and the thermal management component is used to manage the temperature of the plurality of battery cells, and at least a part of the thermal management component is arranged as a flexible structure. The battery device also includes at least one first medium flow channel, and the flexible structure forms at least a part of the side wall of the first medium flow channel. The battery device includes multiple states, and in at least one of the multiple states, the first medium flow channel is filled with a thermal insulation medium, and the thermal management component is used to insulate the battery cells.

[0076] The battery device provided by the embodiment of the present application includes a box, a heat management component and a plurality of battery cells. On the one hand, by arranging the heat management component on the side wall of the box, the heat management component can manage the temperature of the side wall of the box, thereby reducing the influence of the temperature of the box on the temperature of the battery cells close to the box, thereby facilitating the improvement of the temperature uniformity of each battery cell, thereby improving the performance and service life of the battery device. In addition, by arranging at least part of the area of ​​the heat management component as a flexible structure, the weight of the flexible structure is relatively light, which is conducive to reducing the weight of the heat management component, reducing the production cost of the heat management component, and reducing the weight of the battery device; in addition, the flexible structure has a certain degree of flexibility, which can make the heat management component better fit with the box and / or the battery cells, thereby improving the applicability of the heat management component.

[0077] The technical solution described in the embodiments of the present disclosure is applicable to an electric device using a battery device. The electric device includes a battery device in any embodiment of the present disclosure, and the battery device is used to provide electric energy.

[0078] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present disclosure do not impose any special restrictions on the above-mentioned electrical devices.

[0079] It should be noted that the technical solutions described in the embodiments of the present disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices including battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0080] Please refer to Figure 1 , a controller 200, a motor 300 and a battery device 100 may be disposed inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be disposed at the bottom, front, or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of the present disclosure, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0081] See also Figure 2 In order to meet different power requirements, the battery device 100 includes a plurality of battery cells 10, which refer to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells 10 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a plurality of battery cells 10 that are both connected in series and in parallel. A plurality of battery cells 10 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by the plurality of battery cells 10 is accommodated in the box 20; of course, the battery device 100 can also be a plurality of battery cells 10 that are first connected in series, in parallel, or in a hybrid connection to form a battery module, and then the plurality of battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and are accommodated in the box 20. The battery device 100 can also include other structures. For example, the battery device 100 can also include a confluence component for realizing electrical connection between the plurality of battery cells 10. Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes.

[0082] See also Figures 2 to 3The embodiment of the present disclosure provides a battery device 100, which includes a housing 20, a thermal management component 40 and a plurality of battery cells 10. The plurality of battery cells 10 are arranged in a receiving cavity 23. The thermal management component 40 is arranged on the side wall 24 of the housing 20, and the thermal management component 40 is used to manage the temperature of the plurality of battery cells 10, and at least a part of the thermal management component 40 is set as a flexible structure. The battery device 100 also includes at least one first medium flow channel 41, and at least one first medium flow channel 41 is used to conduct heat exchange medium, and the flexible structure forms at least a part of the side wall of the first medium flow channel 41. The battery device 100 includes multiple states, and in at least one of the multiple states, the first medium flow channel 41 is filled with a heat insulating medium, and the thermal management component 40 is used to insulate the battery cells 10.

[0083] The multiple mentioned in the embodiments of the present application refers to a number of two or more.

[0084] The box 20 can be a simple three-dimensional structure such as a single cuboid, a cylinder or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres. The material of the box 20 can be alloy materials such as aluminum alloy, iron alloy, etc., or polymer materials such as polycarbonate, polyisocyanurate foam plastics, or composite materials such as glass fiber and epoxy resin.

[0085] The box body 20 is used to encapsulate the battery cell 10 , and the box body 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 10 .

[0086] Exemplarily, the box 20 is generally a rectangular parallelepiped structure, the length and width directions 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 rectangular parallelepiped structure of the box 20. The height direction of the box 20 is perpendicular to the ground.

[0087] Here, the flexibility in the flexible structure refers to the material properties of the structure. This type of property can be a property given to the material due to its light weight, or a property given to the material due to at least any one of the material's thickness, stiffness, strength, elastic modulus, etc. As an example, the material of the flexible structure can be selected to be a material with a lighter weight than conventional structures such as aluminum plates and steel plates, and its flexibility can be controlled by the thickness, width, length, and type of material of the flexible structure. The embodiment of the present disclosure is conducive to reducing the weight of the thermal management component 40 by setting the thermal management component 40 to include a flexible structure.

[0088] The flexible structure has certain expandable or contractible properties, and it can also be understood that the flexible structure can be a structure with certain elastic deformation. The flexible structure has the ability to deform and restore deformation, so that the thermal management component 40 can be formed into a contoured structure. The thermal management component 40 can better adapt to the side wall 24 of the box body 20, the battery cell 10 or the external contour shape of other components to improve the fit between the thermal management component 40 and the box body 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the thermal management component 40 and the box body 20 and / or the battery cell 10, thereby improving the temperature management effect of the battery cell 10.

[0089] Here, the heat management member 40 may be connected to the side wall 24 of the box body 20 , or may not be connected to the side wall 24 of the box body 20 .

[0090] The heat management component 40 may directly manage the temperature of the plurality of battery cells 10 , or may manage the temperature of the battery cells 10 by managing the temperature of the side wall 24 of the box body 20 .

[0091] The heat management component 40 may be disposed inside the accommodating cavity 23 or outside the accommodating cavity 23 .

[0092] Here, the thermal management component 40 can be partially configured as a flexible structure and another partially configured as a rigid structure, wherein the elastic modulus of the flexible structure is greater than that of the rigid structure. For example, the connection area of ​​the thermal management component 40 is a rigid structure and the flow channel area of ​​the thermal management component 40 is a flexible structure.

[0093] The heat management member 40 may also have a flexible structure in its entirety.

[0094] Exemplarily, the flexible structure is formed on the side wall 24 of the box body 20 by heat pressing. The connection structure is simple and reliable.

[0095] Exemplarily, the box body 20 includes a frame, a top wall and a bottom wall. The frame, the top wall and the bottom wall surround and form a receiving cavity 23. The frame constitutes a side wall 24 of the box body 20. The thermal management component 40 is disposed on the frame.

[0096] The battery device 100 provided in the embodiment of the present application includes a housing 20, a heat management component 40 and a plurality of battery cells 10. On the one hand, by arranging the heat management component 40 on the side wall 24 of the housing 20, the heat management component 40 can manage the temperature of the side wall 24 of the housing 20 to reduce the influence of the temperature of the housing 20 on the temperature of the battery cells 10 near the housing 20, thereby facilitating the improvement of the temperature uniformity of each battery cell 10, and further improving the performance and service life of the battery device 100. In addition, by arranging at least part of the area of ​​the heat management component 40 as a flexible structure, the weight of the flexible structure is relatively light, which is conducive to reducing the weight of the heat management component 40, reducing the production cost of the heat management component 40, and reducing the weight of the battery device 100; in addition, the flexible structure has a certain degree of flexibility, which can make the heat management component 40 better fit with the housing 20 and / or the battery cells 10, and improve the applicability of the heat management component 40.

[0097] There are many ways for the heat management component 40 to manage the temperature of the multiple battery cells 10 , for example, it can be through thermal insulation to achieve the temperature management of the battery cells 10 , or it can be through heat exchange to achieve the temperature management of the battery cells 10 .

[0098] In some embodiments, see Figures 2 to 3 The battery device 100 further includes a first medium flow channel 41. At least one first medium flow channel 41 is used to conduct heat exchange medium, and the flexible structure forms at least a part of the side wall of the first medium flow channel 41.

[0099] Here, the medium may flow in the first medium flow channel 41 to achieve heat insulation or heat exchange, thereby achieving temperature management of the battery cell 10 .

[0100] The first medium flow channel 41 may be formed inside the heat management component 40 , which is helpful to improve the manufacturability and sealing performance of the first medium flow channel 41 .

[0101] A first medium flow channel 41 may also be formed between the heat management component 40 and the side wall 24 of the housing 20. In this way, on the one hand, the material used for the heat management component 40 can be reduced, thereby reducing cost and weight. On the other hand, the medium in the first medium flow channel 41 can be in direct contact with the housing 20, thereby improving heat exchange efficiency.

[0102] In the embodiment where the first medium flow channel 41 is formed between the thermal management component 40 and the side wall 24 of the housing 20, the first medium flow channel 41 may be formed between the thermal management component 40 and the outer side wall 24 of the housing 20, or between the thermal management component 40 and the inner side wall 24 of the housing 20, or between the thermal management component 40 and both the outer side wall 24 of the housing 20 and the inner side wall 24 of the housing 20.

[0103] The first medium flow channel 41 is filled with a heat exchange medium, and the heat management component 40 is at least used for exchanging heat with the side wall 24 of the box body 20 .

[0104] In some embodiments, see Figures 2 to 3 The first medium flow channel 41 is filled with a heat exchange medium, and the heat management component 40 is at least used for exchanging heat with the side wall 24 of the box body 20 .

[0105] During the use of the battery device 100, for example, when the external environment is cold, the external environment may lower the temperature of the box body 20. At this time, the box body 20 can be heated by the thermal management component 40. To a certain extent, the possibility of the battery cell 10 close to the side wall 24 of the box body 20 being too low due to the side wall 24 of the box body 20 being too low can be reduced, thereby improving the temperature uniformity of the battery cell 10.

[0106] Similarly, when the external environment is hot, the external environment may increase the temperature of the box body 20. At this time, the box body 20 can be cooled by the thermal management component 40. To a certain extent, the possibility of the battery cell 10 close to the side wall 24 of the box body 20 being too high due to the side wall 24 of the box body 20 being too high can be reduced, thereby improving the temperature uniformity of the battery cell 10.

[0107] It should be noted that the specific type of the heat exchange medium is not limited here, as long as it can have a heat exchange effect on the battery cell 10, for example, it can be gaseous or liquid.

[0108] The heat management component 40 is at least used for exchanging heat with the side wall 24 of the housing 20 , which means that the heat management component 40 can be used for exchanging heat with the side wall 24 of the housing 20 , and can also exchange heat with the battery cell 10 in addition to exchanging heat with the side wall 24 of the housing 20 .

[0109] In this embodiment, the heat management component 40 is used at least to exchange heat with the side wall 24 of the box body 20 to achieve heating or cooling of the box body 20, that is, to manage the temperature of the box body 20, and indirectly to manage the temperature of the battery cell 10, which is beneficial to improve the temperature uniformity of the battery cell 10.

[0110] In some embodiments, please refer to Figures 2 to 3 The battery device 100 includes a first state and a second state different from the first state. In the first state, the first medium flow channel 41 is filled with a heat exchange medium, and the thermal management component 40 is used to exchange heat for the battery cell 10. In the second state, the first medium flow channel 41 is not filled with a heat exchange medium.

[0111] Exemplarily, the battery device 100 further includes a control system, which is used to control the working state of the thermal management component 40 .

[0112] In the first state, the first medium flow channel 41 is filled with heat exchange medium, and the heat management component 40 is used to exchange heat for the housing 20 , that is, the heat management component 40 needs to heat and cool the housing 20 .

[0113] In the second state, the first medium flow channel 41 is not filled with the heat exchange medium, that is, the heat exchange medium in the first medium flow channel 41 is discharged, and the battery device 100 is in a non-use state.

[0114] Here, by not filling the first medium flow channel 41 with the heat exchange medium, the leakage of the heat exchange medium can be improved, thereby preventing the leaked heat exchange medium from slowly penetrating into the battery device 100 and causing insulation failure or even short circuit and fire of the battery device 100.

[0115] For example, see Figure 3 The heat management component 40 further includes an inlet portion 42 and an outlet portion 43 . The inlet of the inlet portion 42 and the outlet of the outlet portion 43 are both in communication with the first medium flow channel 41 .

[0116] Here, the inlet and outlet of the heat management component 40 are used to be connected to the pipelines of the air conditioning system of the vehicle or the electrical device or a liquid storage device such as a water tank.

[0117] In this embodiment, in the first state, by filling the first medium flow channel 41 with a heat exchange medium, the heat management component 40 is used to exchange heat with the box body 20 to achieve heating or cooling of the box body 20, that is, to achieve temperature management of the box body 20, and indirectly achieve temperature management of the battery cell 10, which is conducive to improving the temperature uniformity of the battery cell 10. In the second state, by discharging the heat exchange medium in the first medium flow channel 41, the leakage of the heat exchange medium can be improved, thereby improving the situation where the leaked heat exchange medium slowly penetrates into the battery device 100, causing insulation failure, or even short circuit and fire of the battery device 100.

[0118] In some embodiments, see Figures 2 to 3 , the first medium flow channel 41 is filled with a heat insulating medium.

[0119] It should be noted that the specific type of the thermal insulation medium is not limited here.

[0120] Exemplarily, the insulating medium is air.

[0121] In this embodiment, by filling the first medium flow channel 41 with a heat insulating medium, it is beneficial to play a heat insulating role between the external environment and the side wall 24 of the box body 20 (that is, it can reduce the influence of the external environment on the temperature of the side wall 24 of the box body 20), and / or, it is beneficial to play a heat insulating role between the side wall 24 of the box body 20 and the battery cell 10 (that is, it can reduce the influence of the side wall 24 of the box body 20 on the temperature of the battery cell 10), thereby improving the thermal insulation effect of the battery device 100.

[0122] In some embodiments, see Figures 2 to 3 The battery device 100 also includes a third state. In the third state, the first medium flow channel 41 is filled with a heat insulating medium, and the thermal conductivity of the heat insulating medium is lower than the thermal conductivity of the heat exchange medium.

[0123] That is, in the third state, the heat exchange medium in the first medium flow channel 41 can be discharged and filled with air to achieve heat insulation for the battery device 100 and achieve a heat preservation effect.

[0124] The thermal insulation medium can be air or other media such as liquid with low thermal conductivity.

[0125] Here, the thermal conductivity of the insulation medium is smaller than the thermal conductivity of the heat exchange medium. Thus, in the third state, it is beneficial to provide insulation between the external environment and the side wall 24 of the box body 20 (i.e., it can reduce the influence of the external environment on the temperature of the side wall 24 of the box body 20), and / or, it is beneficial to provide insulation between the side wall 24 of the box body 20 and the battery cell 10 (i.e., it can reduce the influence of the side wall 24 of the box body 20 on the temperature of the battery cell 10), thereby improving the thermal insulation effect of the battery device 100.

[0126] In some embodiments, see Figures 2 to 3 The battery device 100 includes a fourth state and a fifth state different from the fourth state. In the fourth state, the first medium flow channel 41 is filled with a heat insulating medium. In the fifth state, the first medium flow channel 41 is not filled with a heat insulating medium.

[0127] In the fourth state, the first medium flow channel 41 is filled with a heat insulating medium, and the heat management component 40 is used to insulate the box body 20 and / or the battery cell 10 , thereby improving the heat preservation effect of the battery device 100 .

[0128] In the fifth state, the first medium flow channel 41 is not filled with the heat insulating medium, that is, the heat insulating medium in the first medium flow channel 41 is discharged, and the battery device 100 is in a non-use state.

[0129] Here, by not filling the first medium flow channel 41 with the heat insulating medium, the leakage of the heat exchange medium can be improved, thereby preventing the leaked heat insulating medium from slowly penetrating into the battery device 100 and causing insulation failure or even short circuit and fire of the battery device 100.

[0130] In this embodiment, in the fourth state, the first medium flow channel 41 is filled with a heat-insulating medium, and the thermal management component 40 is used to insulate the box body 20 and / or the battery cell 10, thereby improving the thermal insulation effect of the battery device 100. In the fifth state, the heat-insulating medium in the first medium flow channel 41 is discharged, so that the leakage of the heat-insulating medium can be improved, thereby improving the situation where the leaked heat-insulating medium slowly penetrates into the battery device 100, causing insulation failure, or even short circuit and fire of the battery device 100.

[0131] In some embodiments, see Figures 2 to 3 The heat management component 40 further includes a storage component, which is used to store the medium discharged from the first medium flow channel 41 .

[0132] Here, the storage element may be used to store the heat exchange medium discharged from the first medium flow channel 41 , and may also be used to store the heat insulation medium discharged from the first medium flow channel 41 .

[0133] Here, the specific type of the storage element is not limited. The storage element is a container with a certain volume, which is used to store the medium discharged from the first medium flow channel 41 so that it can be reused.

[0134] In some embodiments, the thermal management component 40 includes a thermal insulation material.

[0135] Here, the heat insulating material refers to a material with a low thermal conductivity, such as inorganic fibers, organic foams, fireproof materials, etc.

[0136] Inorganic fibers may be, for example, rock wool, glass wool, or the like.

[0137] Organic foams may include, for example, polyurethane foam materials, extruded polystyrene boards (XPS boards), expanded polystyrene boards (EPS boards), and the like.

[0138] The fireproof material may be, for example, aluminum silicate fiber, expanded perlite / foam glass, etc.

[0139] In this embodiment, by configuring the thermal management component 40 to include a heat-insulating material, the thermal management component 40 can block the heat exchange between the side wall 24 of the box body 20 and the external environment, and / or the thermal management component 40 can block the heat exchange between the side wall 24 of the box body 20 and the battery cell 10, thereby improving the temperature uniformity of the battery cell 10.

[0140] In some embodiments, see Figure 2 The heat management component 40 is disposed in the accommodating cavity 23 .

[0141] In this way, the heat management component 40 can be used to exchange heat with the side wall 24 of the box body 20 and / or the battery cell 10 to improve the temperature uniformity of the battery cell 10, or the heat management component 40 can be used to block the heat exchange between the side wall 24 of the box body 20 and the battery cell 10 to improve the temperature uniformity of the battery cell 10.

[0142] In some embodiments, the thermal management component 40 is disposed outside the accommodating cavity 23 .

[0143] In this way, the side wall 24 of the box body 20 can be heat-exchanged by the thermal management component 40 to indirectly manage the temperature of the battery cell 10, thereby improving the temperature uniformity of the battery cell 10. Alternatively, the heat management component 40 can be used to block the heat exchange between the side wall 24 of the box body 20 and the external environment to indirectly manage the temperature of the battery cell 10, thereby improving the temperature uniformity of the battery cell 10.

[0144] In some embodiments, the flexible structure includes a metal plasticized film.

[0145] The flexible structure is a single-layer or multi-layer film.

[0146] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0147] In this embodiment, since the metal plastic film is thin and light in weight, and the first medium flow channel 41 is formed between the metal plastic film and the heat exchanger, it is not affected by the extrusion process and does not need to meet the larger thickness requirement, so the overall thickness and weight of the heat management component 40 can be reduced. At the same time, since the heat management component 40 has the characteristics of insulation, the possibility of insulation failure can be reduced. The risk of the heat management component 40 reacting with the heat exchange medium flowing inside is reduced, and the possibility of corrosion and leakage of the heat exchange medium is further reduced.

[0148] Exemplarily, the flexible structure comprises an aluminum-plastic film.

[0149] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0150] In some embodiments, the flexible structure is a layered structure, and the flexible structure includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0151] Here, the flexible structure includes a metal layer and a non-metal layer, that is, a composite material composed of the metal layer and the non-metal layer.

[0152] Exemplarily, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0153] Here, the number of metal layers and non-metal layers is not limited.

[0154] In this embodiment, the flexible structure formed by stacking metal layers and non-metal layers in sequence is thin and light in weight, and by forming the first medium flow channel 41 between the flexible structure and the side wall 24 of the box body 20, it is not affected by the extrusion process and does not need to meet the larger thickness requirement, so the overall thickness and weight of the thermal management component 40 can be reduced. In addition, the thermal management component 40 will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0155] In some embodiments, the flexible structure is a layered structure, and the flexible structure includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0156] Exemplarily, the non-metal layer is located between the metal layer and the side wall 24 of the box body 20 .

[0157] Here, by arranging the non-metal layer on the side of the metal layer facing the side wall 24 of the box body 20 , the non-metal layer can be connected to the side wall 24 of the box body 20 by heat pressing.

[0158] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0159] By setting the metal layer to be one or more of aluminum foil, copper foil and steel foil, the flexible structure can have a certain structural strength and can play an isolation role.

[0160] In some embodiments, the non-metallic layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0161] By setting the non-metallic layer to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible structure can have a certain waterproof effect.

[0162] Exemplarily, a non-metallic layer of a corrosion-resistant material having acid and alkali corrosion resistance may be selected, or in other words, an additive may be added to the non-metallic layer to make the non-metallic layer have acid and alkali corrosion resistance.

[0163] In some embodiments, the non-metallic layer is a hot melt layer.

[0164] Here, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer with the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0165] In some embodiments, the thickness of the flexible structure is 0.05 mm-0.3 mm.

[0166] For example, it is any point value of 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, and 0.3mm, or a point value between any two of them.

[0167] In this embodiment, by setting the thickness of the flexible structure to 0.05 mm-0.3 mm, the thermal management component 40 made of the flexible structure has a certain structural strength and the overall thickness of the thermal management component 40 is smaller, which is beneficial to reducing the overall volume and weight of the battery device 100 to increase the energy density of the battery device 100.

[0168] In some embodiments, the thickness of the flexible structure is 0.08 mm-0.2 mm.

[0169] For example, it is any one of 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, and 0.2mm, or a point value between any two of them.

[0170] In this embodiment, by setting the thickness of the flexible structure to 0.08 mm-0.2 mm, the thermal management component 40 made of the flexible structure has a certain structural strength, and the overall thickness of the thermal management component 40 is further reduced, which is beneficial to further reduce the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0171] In some embodiments, the elastic modulus of the flexible structure is 0.1 MPa-10000 MPa.

[0172] Exemplarily, the elastic modulus of the flexible structure can be any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, and 10000 MPa, or any value between two of them.

[0173] The elastic modulus describes the unit strain caused by unit stress when a solid is subjected to force within a certain range. It is one of the basic physical quantities of a material. The larger the elastic modulus, the greater the stiffness of the material and the greater its compressive resistance. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0174] In this embodiment, by setting the elastic modulus of the flexible structure to 0.1MPa-10000MPa, the flexible structure not only has a certain structural strength, thereby improving the reliability of the thermal management component 40, but also has a certain deformation ability, which can improve the fit between the thermal management component 40 and the case 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the thermal management component 40 and the case 20 and / or the battery cell 10, thereby improving the heat exchange efficiency and heat exchange effect of the thermal management component 40.

[0175] In some embodiments, the thermal management member 40 includes a flexible member 31 and a rigid member 32 , and the flexible member 31 and the rigid member 32 are located between the battery cell 10 and the side wall 24 of the box body 20 .

[0176] Exemplarily, the flexible member 31 and the rigid member 32 are stacked to form at least one first medium flow channel 41, which means that the thermal management member 40 forms the first medium flow channel 41 between the flexible member 31 and the rigid member 32. In other words, the flexible member 31 constitutes at least part of the side wall 24 of the first medium flow channel 41, and the rigid member 32 also constitutes at least part of the side wall 24 of the first medium flow channel 41. The heat exchange medium circulates in the first medium flow channel 41 to achieve heat exchange with the battery cell 10.

[0177] In some embodiments, see Figures 2 to 5 The battery device 100 also includes a heat exchange component 30, which is arranged on at least one side of the battery cell 10 along the height direction of the battery device 100. The heat exchange component 30 has at least one second medium flow channel 312 inside, and the at least one second medium flow channel 312 is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with multiple battery cells 10.

[0178] The heat exchange component 30 is arranged on at least one side of the battery cell 10 along the height direction of the battery device 100, which means that the heat exchange component 30 can be arranged on the bottom of the battery cell 10 along the battery device 100, or on the top of the battery cell 10 along the battery device 100, or on the bottom and top of the battery cell 10 along the battery device 100.

[0179] The principle of heat exchange of the heat exchange component 30 on the battery cell 10 is as follows: the heat exchange medium output by the heat exchange medium source enters the second medium flow channel 312 through the inlet of the heat exchange component 30, and after the heat exchange medium exchanges heat with the battery cell 10, the heat exchange medium flows out through the outlet of the heat exchange component 30, completing the heat exchange of the battery cell 10.

[0180] In this embodiment, during the use of the battery device 100, the battery cells 10 in the battery device 100 will generate heat. By providing the heat exchange component 30, the battery cells 10 of the battery device 100 can be effectively cooled, which is beneficial to further improve the performance and service life of the battery device 100.

[0181] In some embodiments, see Figures 4 to 5 The heat exchange component 30 includes at least two heat exchange components, at least one heat exchange component is configured as a flexible component 31, and at least one heat exchange component is configured as a rigid component 32. The elastic modulus of at least a portion of the flexible component 31 is smaller than the elastic modulus of the rigid component 32. The flexible component 31 and the rigid component 32 are stacked to form at least one second medium flow channel 312.

[0182] Here, the elastic modulus of a partial area of ​​the flexible member 31 may be smaller than the elastic modulus of the rigid member 32 , or the elastic modulus of the entire area of ​​the flexible member 31 may be smaller than the elastic modulus of the rigid member 32 .

[0183] The heat exchange assembly 30 includes at least two heat exchange elements, that is, there are multiple heat exchange elements.

[0184] At least one heat exchange component is configured as a flexible component 31, which means that the number of the flexible components 31 is one or more. In the embodiment where multiple heat exchange components are configured as flexible components 31, the flexible components 31 may be the same or different.

[0185] At least one heat exchange component is configured as a rigid component 32, which means that the number of rigid components 32 is one or more. In the embodiment where multiple heat exchange components are configured as rigid components 32, the rigid components 32 may be the same or different.

[0186] Exemplarily, the heat exchange assembly 30 includes two heat exchange components, one of which is a flexible component 31 and the other is a rigid component 32 .

[0187] Exemplarily, the rigid member 32 is a rigid plate-like structure, which can support the flexible member 31 , thereby facilitating improving the overall structural strength and stability of the heat exchange assembly 30 .

[0188] For example, the rigid member 32 may be stamped or welded to form a specific structure as required for supporting functions.

[0189] Exemplarily, the heat exchange component 30 further includes an inlet and an outlet, and both the inlet and the outlet are in communication with the second medium flow channel 312 .

[0190] Here, the inlet and outlet of the heat exchange assembly 30 are used to be connected to the pipelines of the air conditioning system of the vehicle or the electrical device or a liquid storage device such as a water tank.

[0191] For example, see Figures 4 to 5 The heat exchange component 30 also includes a connecting member 33 having an inlet and a connecting member 33 having an outlet, and the connecting member 33 is connected to the rigid member 32.

[0192] Exemplarily, the connecting member 33 is connected to the rigid member 32 by soldering.

[0193] Exemplarily, the connection member 33 is, for example, a faucet.

[0194] Here, the heat exchange component 30 exchanging heat with the battery cell 10 may be to dissipate heat from the battery cell 10 or to heat the battery cell 10 .

[0195] Here, the material of the flexible member 31 of the heat exchange component 30 and the material of the flexible member 31 of the heat management member 40 may be the same as or different from each other.

[0196] The material of the rigid component 32 of the heat exchange component 30 and the material of the rigid component 32 of the heat management component 40 may be the same or different.

[0197] In some embodiments, see Figures 4 to 5 The flexible part 31 and the rigid part 32 are hot pressed to form a hot pressing area 311 and a first medium flow channel 41, or the flexible part 31 and the rigid part 32 are hot pressed to form a hot pressing area 311 and a second medium flow channel 312, and the flexible part 31 and the rigid part 32 are connected to each other in at least a part of the hot pressing area 311.

[0198] That is to say, the flexible member 31 and the rigid member 32 are connected by hot pressing, and this molding method is simple.

[0199] Here, the flexible member 31 is sealed by a hot pressing process, and the hot pressing process can effectively ensure that the heat exchange component 30 has good sealing performance and is not prone to cracking.

[0200] In this embodiment, the flexible part 31 is sealed by a hot pressing process, that is, a hot pressing area 311 is formed by hot pressing. The hot pressing area 311 separates the thermal management part 40 to form at least one first medium flow channel 41 or separates the heat exchange component 30 to form at least one second medium flow channel 312. This molding method is simple.

[0201] Exemplarily, the heat-pressing area 311 includes a heat-sealing area and a non-heat-sealing area, and the non-heat-sealing area and the first medium flow channel 41 are respectively located on both sides of the heat-sealing area, or the non-heat-sealing area and the second medium flow channel 312 are respectively located on both sides of the heat-sealing area, which is conducive to reducing the width of the heat-sealing area, improving the problem of excessive temperature caused by the heat-sealing area being too wide, affecting the heat-pressing quality and damaging the flexible member 31. In addition, the non-heat-sealing area can also form a buffer zone for stress release when the flexible member 31 is folded, improving the situation where stress concentration occurs in the heat-sealing area and causes damage to the heat-sealing area.

[0202] In the related art, the heat exchange assembly 30 is formed by welding a high-strength aluminum alloy. However, since the high-strength aluminum alloy (5 series, 6 series, etc.) has a high alloy content, alloy elements will precipitate during welding, affecting the welding quality.

[0203] In the embodiment of the present application, the heat exchange component 30 is configured to include a flexible part 31 and a rigid part 32, and the flexible part 31 and the rigid part 32 are hot pressed to form a hot pressing area 311 and a second medium flow channel 312. The hot pressing temperature (150°C ± 10°C) is lower than the brazing temperature in the related art, and alloy elements will not precipitate, which is beneficial to further improve the structural strength of the heat exchange component 30.

[0204] In this embodiment, by setting at least one heat exchange component as a flexible component 31, the weight of the flexible component 31 is relatively light, which is beneficial to reducing the weight of the heat exchange component 30, reducing the production cost of the heat exchange component 30, and reducing the weight of the battery device 100; in addition, the flexible component 31 has a certain flexibility, which can make the heat exchange component 30 fit better with the case 20 and / or the battery cell 10, thereby absorbing the assembly tolerance of the heat exchange component 30, without the need to use filler or thermal conductive material, thereby improving the fit between the heat exchange component 30 and the case 20 and / or the battery cell 10, and increasing the effective heat exchange area between the heat exchange component 30 and the case 20 and / or the battery cell 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30. On the other hand, by setting at least one heat exchange component as a rigid component 32, the flexible component 31 and the rigid component 32 are stacked to form at least one second medium flow channel 312, and the rigid component 32 can support the flexible component 31, which is beneficial to improve the overall structural strength and stability of the heat exchange component 30, and further improve the heat exchange effect of the heat exchange component 30; in addition, by setting the rigid component 32, the heat exchange component 30 has sufficient structural strength to carry the battery cell 10, thereby improving the applicability of the heat exchange component 30.

[0205] It should be noted that the specific material of the rigid component 32 is not limited here.

[0206] In some embodiments, the rigid member 32 is configured as a metal plate.

[0207] By way of example, it may be an aluminum alloy.

[0208] In this embodiment, by setting the rigid part 32 as a metal plate, the metal plate has both good structural strength and good thermal conductivity. That is to say, while satisfying the heat exchange component 30 with a certain heat exchange efficiency, the rigid part 32 can also play a certain supporting role for the flexible part 31.

[0209] In some embodiments, see Figure 5 The flexible structure is a layered structure, and the flexible structure includes a first anti-corrosion layer 313 , an isolation layer 314 , and a second anti-corrosion layer 315 arranged in sequence. The first anti-corrosion layer 313 is closer to the first medium flow channel 41 than the second anti-corrosion layer 315 .

[0210] Here, the flexible member refers to the flexible structure.

[0211] Here, the second anti-corrosion layer 315 may be a nylon layer formed of nylon material, so that it has certain corrosion resistance, for example, resistance to acid and alkali corrosion.

[0212] The isolation layer 314 may be a metal layer, and the metal layer may be configured as one or more of aluminum foil, copper foil and steel foil, which may allow the flexible structure to have a certain structural strength and play an isolation role.

[0213] The first anti-corrosion layer 313 may be a non-metallic layer, which may be configured to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, so as to allow the flexible structure to have a certain waterproof effect.

[0214] In this embodiment, by setting the flexible structure to include a first anti-corrosion layer 313, an isolation layer 314 and a second anti-corrosion layer 315 arranged in sequence, the second anti-corrosion layer 315 is closer to the first medium flow channel 41 than the first anti-corrosion layer 313, which is beneficial to improving the reliability of the thermal management component 40.

[0215] In some embodiments, the isolation layer 314 has a thickness of 6.5 μm-100 μm.

[0216] The thickness of the isolation layer 314 can be any one of 6.5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 38μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm or any value between two of them.

[0217] In this embodiment, by setting the thickness of the isolation layer 314 to 6.5 μm-100 μm, the flexible structure can have certain structural strength and flexibility.

[0218] In some embodiments, the isolation layer 314 has a thickness of 6.5 μm-15 μm.

[0219] The thickness of the isolation layer 314 can be any one of 6.5μm, 7μm, 7.5μm, 7.8μm, 8μm, 8μm, 8.3μm, 8.5μm, 8.8μm, 9μm, 9.2μm, 9.5μm, 9.7μm, 10μm, 10.3μm, 10.5μm, 10.8μm, 11μm, 11.5μm, 11.8μm, 12μm, 12.3μm, 12.5μm, 13μm, 13.5μm, 14μm, 14.5μm, 15μm or any value between any two of them.

[0220] In this embodiment, by setting the thickness of the isolation layer 314 to 6.5 μm-15 μm, the flexible structure can be further endowed with certain structural strength and flexibility.

[0221] In some embodiments, the second anti-corrosion layer 315 has a thickness of 5 μm-20 μm.

[0222] The thickness of the second anti-corrosion layer 315 can be 5 μm, 5.5 μm, 5.8 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 7.8 μm, 8 μm, 8.3 μm, 8.5 μm, 8.8 μm, 9 μm, 9.2 μm, 9.5 μm, 9.7 μm, 10 μm, 10.3 μm, 10.5 μm, 10.8 μm, 11 μm, 11.5 μm, 1 Any one of the point values ​​of 1.8μm, 12μm, 12.3μm, 12.5μm, 13μm, 13.5μm, 14μm, 14.5μm, 15μm, 15.5μm, 16μm, 16.5μm, 17μm, 17.5μm, 18μm, 18.5μm, 18.7μm, 19μm, 19.5μm, 20μm or any point value between any two of them.

[0223] In this embodiment, by setting the thickness of the second anti-corrosion layer 315 to 5 μm-20 μm, the wear resistance and toughness of the flexible structure can be improved.

[0224] In some embodiments, the thickness of the first anti-corrosion layer 313 is 50 μm-120 μm.

[0225] The thickness of the first anti-corrosion layer 313 can be any one of 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm, 105μm, 108μm, 110μm, 115μm, 120μm or any value between two of them.

[0226] In this embodiment, by setting the thickness of the first anti-corrosion layer 313 to 50 μm-120 μm, the first anti-corrosion layer 313 can have a certain structural strength, improve the waterproof performance, and facilitate hot pressing connection of the flexible structure through the first anti-corrosion layer 313.

[0227] The elastic modulus of the flexible member 31 may be measured by at least one of a static tensile test method, a dynamic test method, a sonic velocity method, a nanoindentation method, and a bending method. The measuring instrument may include a nanoindenter and a universal testing machine.

[0228] For example, the elastic modulus of the flexible member 31 can be measured at room temperature and pressure by a nanoindentation method, which uses a tiny indenter to indent the surface of the flexible member 31 and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0229] In the description of the present disclosure, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in the present disclosure and features of different embodiments or examples, unless they are contradictory.

[0230] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A box body, wherein the box body has a containing cavity inside; A plurality of battery cells, wherein the plurality of battery cells are arranged in the accommodation cavity; A thermal management component, the thermal management component is arranged on the side wall of the box body, the thermal management component is used to heat and cool the multiple battery cells, and at least a part of the thermal management component is set as a flexible structure; the battery device also includes at least one first medium flow channel, and the flexible structure forms at least a part of the side wall of the first medium flow channel; The battery device includes multiple states, and in at least one of the multiple states, the first medium flow channel is filled with a heat-insulating medium, and the heat-management component is used to insulate the battery cell.

2. The battery device according to claim 1, characterized in that: The first medium flow channel is formed inside the thermal management component; and / or, The first medium flow channel is formed between the heat management component and the side wall of the box body.

3. The battery device according to claim 1, characterized in that: The battery device includes a first state and a second state different from the first state; In the first state, the first medium flow channel is filled with a heat exchange medium, and the thermal management component is used to exchange heat for the battery cell; In the second state, the first medium flow channel is not filled with the heat exchange medium, and the thermal conductivity of the heat insulating medium is lower than the thermal conductivity of the heat exchange medium.

4. The battery device according to claim 1, characterized in that: The thermal insulation medium includes air.

5. The battery device according to claim 1, characterized in that: The battery device includes a fourth state and a fifth state different from the fourth state; In the fourth state, the first medium flow channel is filled with the heat insulating medium; in the fifth state, the first medium flow channel is not filled with the heat insulating medium.

6. The battery device according to any one of claims 1 to 5, characterized in that: The heat management component further includes a storage component, and the storage component is used to store the medium discharged from the first medium flow channel.

7. The battery device according to claim 1, characterized in that: The heat management component includes a heat insulating material.

8. The battery device according to any one of claims 1 to 5, characterized in that: The heat management component is disposed in the accommodating cavity, and / or the heat management component is disposed outside the accommodating cavity.

9. The battery device according to any one of claims 1 to 5, characterized in that: The flexible structure is formed on the side wall of the box body by hot pressing.

10. The battery device according to any one of claims 1 to 5, characterized in that: The flexible structure includes a metal plasticized film.

11. The battery device according to claim 10, characterized in that: The flexible structure comprises an aluminum-plastic film.

12. The battery device according to any one of claims 1 to 5, characterized in that: The flexible structure is a layered structure, comprising a metal layer and a non-metal layer, wherein the metal layer and the non-metal layer are stacked in sequence.

13. The battery device according to claim 12, characterized in that: The metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or, The non-metallic layer includes one or more of polypropylene, polyvinyl chloride and polyethylene.

14. The battery device according to claim 12, characterized in that: The non-metallic layer is a hot-melt layer.

15. The battery device according to any one of claims 1 to 5, characterized in that: The flexible structure is a layered structure, and includes a first anti-corrosion layer, an isolation layer, and a second anti-corrosion layer which are arranged in sequence. The first anti-corrosion layer is closer to the first medium flow channel than the second anti-corrosion layer.

16. The battery device according to any one of claims 1 to 5, characterized in that: The thickness of the flexible structure is 0.05 mm-0.3 mm.

17. The battery device according to claim 16, characterized in that: The thickness of the flexible structure is 0.08 mm-0.2 mm.

18. The battery device according to any one of claims 1 to 5, characterized in that: The elastic modulus of the flexible structure is 0.1 MPa-10000 MPa.

19. The battery device according to any one of claims 1 to 5, characterized in that: The thermal management component includes a flexible component and a rigid component, and the flexible component and the rigid component are located between the battery cell and the side wall of the box body.

20. The battery device according to any one of claims 1 to 5, characterized in that: The battery device also includes a heat exchange component, which is arranged on at least one side of the battery cell along the height direction of the battery device. The heat exchange component has at least one second medium flow channel inside, and the at least one second medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the multiple battery cells.

21. The battery device according to claim 20, characterized in that The heat exchange component includes at least two heat exchange parts, at least one of which is configured as a flexible part, and at least one of which is configured as a rigid part. The elastic modulus of at least a partial area of ​​the flexible part is smaller than the elastic modulus of the rigid part. The flexible part and the rigid part are stacked to form the at least one second medium flow channel.

22. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 21.

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