Heat exchange assembly, battery device and power utilization device

Abstract

The embodiment of the utility model provides a heat exchange assembly, a battery device and an electric device. The battery device comprises a box body assembly, a heat exchange assembly and a plurality of single batteries, and the plurality of battery monomers are arranged in the box body assembly. At least one medium runner is arranged in the heat exchange assembly and is used for conducting a heat exchange medium, and the heat exchange medium is used for carrying out heat exchange with the plurality of single batteries. The heat exchange assembly comprises a flexible structure and a rigid structure which are arranged in the first direction, the Rockwell hardness of the flexible structure is smaller than the Rockwell hardness of the rigid structure, the heat exchange assembly extends in the first direction, and the first direction intersects with the height direction of the box body assembly. According to the battery device provided by the embodiment of the invention, the overall structural strength and stability of the heat exchange assembly can be improved, so that the reliability of the heat exchange assembly is improved, the assembly tolerance between the flexible structure and the rigid structure can be absorbed, and the assembly efficiency of the heat exchange assembly can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a heat exchange component, a battery device, and an electrical device. Background Art

[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. During the use of the battery device, the battery cells inside the battery device generate heat. If these heats are too high, it will have an adverse impact on the performance and service life of the battery device. Therefore, how to effectively dissipate the heat of the battery cells of the battery device while improving the reliability of the heat exchange component has become an important research direction in this field. Summary of the Utility Model

[0003] In view of this, the embodiments of the present application are expected to provide a heat exchange component, a battery device, and an electrical device, which can improve the reliability of the heat exchange component to a certain extent.

[0004] To this end, the first aspect of the embodiments of the present application provides a battery device, including:

[0005] A box body assembly;

[0006] A plurality of battery cells, the plurality of battery cells are arranged inside the box body assembly;

[0007] A heat exchange component, at least one medium flow channel is provided inside the heat exchange component, the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells;

[0008] Wherein, the heat exchange component includes a flexible structure and a rigid structure arranged along a first direction, the Rockwell hardness of the flexible structure is less than the Rockwell hardness of the rigid structure, the heat exchange component extends along the first direction, and the first direction intersects with the height direction of the box body assembly.

[0009] The battery device provided by the embodiment of the present application includes a box body assembly, a heat exchange assembly, and a plurality of battery cells. The plurality of battery cells are arranged in the box body assembly, and the box body assembly plays a role in protecting the battery cells. The heat exchange assembly is used for heat exchange with the battery cells. By setting the heat exchange assembly to include a flexible structure and a rigid structure arranged along a first direction, the Rockwell hardness of the flexible structure is less than that of the rigid structure. The heat exchange assembly extends along the first direction, and the first direction intersects with the height direction of the box body assembly. In this way, the rigid structure with relatively high Rockwell hardness can play a role in improving the overall structural strength and stability of the heat exchange assembly, thereby improving the reliability of the heat exchange assembly. In addition, the flexible structure with relatively low Rockwell hardness has the characteristic of relatively light weight, which is beneficial to reducing the weight of the heat exchange assembly. That is to say, while enabling the heat exchange assembly to have a certain structural strength, it is beneficial to reduce the weight of the heat exchange assembly. In addition, the flexible structure has a certain flexibility, which can make the heat exchange assembly better fit with the box body assembly and / or the battery cells, thereby facilitating the absorption of the assembly tolerance of the heat exchange assembly, eliminating the need to use caulking agents or thermal conductive materials, improving the fit degree between the heat exchange assembly and the box body assembly and / or the battery cells, increasing the effective heat exchange area between the heat exchange assembly and the box body assembly and / or the battery cells, and thus improving the heat exchange effect of the heat exchange assembly. In addition, the flexible structure and the rigid structure can be flexibly connected. That is to say, the connection between the flexible structure and the rigid structure is a connection method that can undergo axial expansion and contraction, folding, and a certain displacement amount perpendicular to the axis. In this way, when the heat exchange assembly is subjected to external force collision or extrusion, the flexible structure and the rigid structure can deform through the flexible connection structure, which can, to a certain extent, improve the situation of breakage and liquid leakage of the heat exchange assembly, and thus is beneficial to further improving the reliability of the heat exchange assembly. In addition, the flexible connection structure between the flexible structure and the rigid structure is also beneficial to absorbing the assembly tolerance between the flexible structure and the rigid structure, thereby facilitating the improvement of the assembly efficiency of the heat exchange assembly.

[0010] In some embodiments, the heat exchange assembly is arranged below the plurality of battery cells, and the region of the heat exchange assembly located at the bottom of the plurality of battery cells is set as the flexible structure, and the region of the heat exchange assembly at least connected to the box body assembly is set as the rigid structure.

[0011] In this embodiment, by arranging the heat exchange assembly below the plurality of battery cells and setting the region of the heat exchange assembly located at the bottom of the plurality of battery cells as the flexible structure, it is beneficial to the fit degree between the heat exchange assembly and the battery cells, increases the effective heat exchange area between the heat exchange assembly and the battery cells, and thus improves the heat exchange effect of the heat exchange assembly. In addition, by setting the region of the heat exchange assembly at least connected to the box body assembly as the rigid structure, it is beneficial to improving the connection reliability of the heat exchange assembly.

[0012] In some embodiments, the flexible structure is provided as a metal part, and the Rockwell hardness of the flexible structure ranges from HRB50 to HRB6000.

[0013] In this embodiment, by providing the flexible structure as a metal part and setting the Rockwell hardness of the flexible structure of the metal part to range from HRB50 to HRB6000, the flexible structure can have a certain structural strength and flexibility.

[0014] In some embodiments, the flexible structure is provided as a non-metal part, and the Rockwell hardness of the flexible structure ranges from HRR5000 to HRR150000.

[0015] In this embodiment, by providing the flexible structure as a non-metal part and setting the Rockwell hardness of the flexible structure of the non-metal part to range from HRR5000 to HRR150000, the flexible structure can have a certain structural strength and flexibility.

[0016] In some embodiments, the flexible structure is provided as a metal matrix composite part, and the Rockwell hardness of the flexible structure ranges from HRB50 to HRB6000.

[0017] In this embodiment, by providing the flexible structure as a metal matrix composite part and setting the Rockwell hardness of the flexible structure of the metal matrix composite part to range from HRB50 to HRB6000, the flexible structure can have a certain structural strength and flexibility.

[0018] In some embodiments, the flexible structure is provided as a polymer matrix composite part, and the Rockwell hardness of the flexible structure ranges from HRR5000 to HRR150000.

[0019] In this embodiment, by providing the flexible structure as a polymer matrix composite part and setting the Rockwell hardness of the flexible structure of the polymer matrix composite part to range from HRR5000 to HRR150000, the flexible structure can have a certain structural strength and flexibility.

[0020] In some embodiments, the elongation at break of the flexible structure ranges from 10% to 100%.

[0021] In this embodiment, by setting the elongation at break of the flexible structure to range from 10% to 100%, the flexible structure can have a certain impact resistance and puncture resistance while also having a certain structural strength.

[0022] In some embodiments, the elastic modulus of the flexible structure ranges from 1 GPa to 200 GPa.

[0023] In this embodiment, by setting the elastic modulus of the flexible structure to be in the range of 1 GPa to 200 GPa, the flexible structure has a certain structural strength, improving the reliability of the heat exchange component, and also has a certain deformation ability, which can enhance the fit between the heat exchange component and the box component and / or the battery cell, thereby increasing the effective heat exchange area between the heat exchange component and the box component and / or the battery cell, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0024] In some embodiments, the flexible structure is closer to the battery cell than the rigid structure, and the thermal conductivity of the flexible structure is greater than that of the rigid structure.

[0025] In this embodiment, by setting the flexible structure to be closer to the battery cell than the rigid structure and the thermal conductivity of the flexible structure to be greater than that of the rigid structure, on the one hand, it is beneficial to enhance the heat exchange between the heat exchange medium and the battery cell through the flexible structure, thereby improving the heat exchange efficiency. On the other hand, it can improve the diffusion of the heat of the heat exchange medium through the rigid structure, which is beneficial to further improving the heat exchange efficiency.

[0026] In some embodiments, the thermal conductivity of the flexible structure is in the range of 0.2 W / m·K to 800 W / m·K; and / or,

[0027] the thermal conductivity of the rigid structure is in the range of 0.01 W / m·K to 400 W / m·K.

[0028] In this embodiment, by setting the thermal conductivity of the flexible structure to be in the range of 0.2 W / m·K to 800 W / m·K, it is beneficial to enhance the heat exchange between the heat exchange medium and the battery cell through the flexible structure, thereby improving the heat exchange efficiency.

[0029] By setting the thermal conductivity of the rigid structure to be in the range of 0.01 W / m·K to 400 W / m·K, it is beneficial to improve the diffusion of the heat of the heat exchange medium through the rigid structure, which is beneficial to further improving the heat exchange efficiency.

[0030] 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.

[0031] In this embodiment, the flexible structure formed by stacking the metal layer and the non-metal layer in sequence has a thin thickness and a small weight, and by forming a medium flow channel between the flexible structure and the rigid structure, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component can be reduced. In addition, the heat exchange component will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0032] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil; and / or,

[0033] the non-metal layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0034] By setting the metal layer as 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.

[0035] By setting the non-metal layer as one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible structure can have a certain waterproof effect.

[0036] In some embodiments, the non-metal layer is a hot melt layer.

[0037] It is beneficial to make the non-metal layer and the metal layer composite together by hot melting, with simple molding and high production efficiency.

[0038] 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 medium flow channel than the second anti-corrosion layer.

[0039] In this embodiment, by setting the flexible structure to include a first anti-corrosion layer, an isolation layer, and a second anti-corrosion layer arranged in sequence, and the second anti-corrosion layer is closer to the medium flow channel than the first anti-corrosion layer, it is beneficial to improve the reliability of the heat exchange component.

[0040] In some embodiments, the flexible structure includes a metal plastic film.

[0041] In this embodiment, since the metal plastic film has a thin thickness and small weight, and a medium flow channel is formed between the metal plastic film and the heat exchange element, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component can be reduced. At the same time, because the heat exchange component has the characteristics of insulation, the possibility of insulation failure can be reduced. The risk of reaction between the heat exchange component and the heat exchange medium flowing inside is reduced, and the possibility of corrosion and leakage of the heat exchange medium is further reduced.

[0042] In some embodiments, the flexible structure includes an aluminum plastic film.

[0043] The aluminum plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation.

[0044] In some embodiments, the thickness of the flexible structure is 0.05 mm - 0.3 mm.

[0045] In this embodiment, by setting the thickness of the flexible structure to be 0.05 mm - 0.3 mm, while the heat exchange component made of the flexible structure has a certain structural strength, the overall thickness of the heat exchange component is relatively small, which is beneficial to reducing the overall volume and weight of the battery device, so as to increase the energy density of the battery device.

[0046] In a second aspect of the embodiments of the present application, a heat exchange component is provided. The heat exchange component has at least one medium flow channel inside, and the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery monomers.

[0047] Wherein, the heat exchange component includes a flexible structure and a rigid structure arranged along a first direction. The Rockwell hardness of the flexible structure is less than that of the rigid structure. The heat exchange component extends along the first direction, and the first direction intersects with the height direction of the box body component.

[0048] The heat exchange component provided in the embodiments of the present application is used to exchange heat with the battery monomers. By setting the heat exchange component to include a flexible structure and a rigid structure arranged along a first direction, the Rockwell hardness of the flexible structure is less than that of the rigid structure, the heat exchange component extends along the first direction, and the first direction intersects with the height direction of the box body component. In this way, the rigid structure with a relatively large Rockwell hardness can play a role in improving the overall structural strength and stability of the heat exchange component, thereby improving the reliability of the heat exchange component. In addition, the flexible structure with a relatively small Rockwell hardness has the characteristic of being relatively light in weight, which is beneficial to reducing the weight of the heat exchange component. That is to say, while enabling the heat exchange component to have a certain structural strength, it is beneficial to reduce the weight of the heat exchange component. In addition, the flexible structure has a certain flexibility, which can enable the heat exchange component to better fit with the box body component and / or the battery monomers, thereby being beneficial to absorbing the assembly tolerances of the heat exchange component, without the need to use caulking agents or thermal conductive materials, improving the fitting degree between the heat exchange component and the box body component and / or the battery monomers, increasing the effective heat exchange area between the heat exchange component and the box body component and / or the battery monomers, and thus improving the heat exchange effect of the heat exchange component. In addition, the flexible structure and the rigid structure can be flexibly connected. That is to say, the connection between the flexible structure and the rigid structure is a connection method that can undergo axial expansion and contraction, folding, and a certain displacement amount perpendicular to the axis. In this way, when the heat exchange component is subjected to external force collision or extrusion, the flexible structure and the rigid structure can deform through the flexible connection structure, which can, to a certain extent, improve the situation of the heat exchange component being damaged and leaking liquid, and thus is beneficial to further improving the reliability of the heat exchange component. In addition, the flexible connection structure between the flexible structure and the rigid structure is also beneficial to absorbing the assembly tolerances between the flexible structure and the rigid structure, and thus is beneficial to improving the assembly efficiency of the heat exchange component.

[0049] The third aspect of the embodiments of the present application provides an electrical device, including the battery device or the heat exchange component described above.

[0050] The battery device of the electrical device provided by the embodiments of the present application includes a box body component, a heat exchange component, and a plurality of battery cells. The plurality of battery cells are arranged in the box body component, and the box body component plays a role in protecting the battery cells. The heat exchange component is used for heat exchange with the battery cells. By setting the heat exchange component to include a flexible structure and a rigid structure arranged along a first direction, the Rockwell hardness of the flexible structure is less than that of the rigid structure. The heat exchange component extends along the first direction, and the first direction intersects with the height direction of the box body component. In this way, the rigid structure with a relatively large Rockwell hardness can play a role in improving the overall structural strength and stability of the heat exchange component, thereby improving the reliability of the heat exchange component. In addition, the flexible structure with a relatively small Rockwell hardness has the characteristic of relatively light weight, which is beneficial to reducing the weight of the heat exchange component. That is to say, while enabling the heat exchange component to have a certain structural strength, it is beneficial to reduce the weight of the heat exchange component. In addition, the flexible structure has a certain flexibility, which can enable the heat exchange component to better fit with the box body component and / or the battery cells, thereby being beneficial to absorbing the assembly tolerance of the heat exchange component, without the use of caulking agents or thermal conductive materials, improving the fit degree between the heat exchange component and the box body component and / or the battery cells, increasing the effective heat exchange area between the heat exchange component and the box body component and / or the battery cells, and thus improving the heat exchange effect of the heat exchange component. In addition, the flexible structure and the rigid structure can be flexibly connected. That is to say, the flexible structure and the rigid structure are connected in a way that can undergo axial expansion and contraction, folding, and a certain displacement amount perpendicular to the axis. In this way, when the heat exchange component is subjected to external force collision or extrusion, the flexible structure and the rigid structure can deform through the flexible connection structure, which can, to a certain extent, improve the situation of damage and liquid leakage of the heat exchange component, and thus be beneficial to further improving the reliability of the heat exchange component. In addition, the flexible connection structure between the flexible structure and the rigid structure is also beneficial to absorbing the assembly tolerance between the flexible structure and the rigid structure, and thus is beneficial to improving the assembly efficiency of the heat exchange component. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present disclosure;

[0052] Figure 2 is a three-dimensional exploded schematic diagram of a battery device provided by some embodiments of the present disclosure;

[0053] Figure 3 is a schematic structural diagram of a heat exchange component provided by the first embodiment of the present disclosure;

[0054] Figure 4 is a schematic structural diagram of a heat exchange component provided by the second embodiment of the present disclosure;

[0055] Figure 5 Exploded perspective view of the flexible structure provided by some embodiments of the present disclosure.

[0056] Description of reference numerals

[0057] 10, battery cell; 20, box assembly; 21, box body; 211, first box part; 212, second box part; 22, bottom guard plate; 23, accommodation cavity; 30, heat exchange assembly; 31, flexible structure; 313, first anti-corrosion layer; 314, isolation layer; 315, second anti-corrosion layer; 32, rigid structure; 34, connecting member; 100, battery device; 200, controller; 300, motor; 1000, vehicle. Detailed implementation manners

[0058] Without special instructions, all embodiments and optional embodiments of the present disclosure can be combined with each other to form new technical solutions.

[0059] Without special instructions, all technical features and optional technical features of the present disclosure can be combined with each other to form new technical solutions.

[0060] With the development of clean energy, more and more devices use electric energy as the driving energy. As a result, power batteries that can store more electric energy and can be repeatedly charged and discharged have developed rapidly, such as lithium-ion batteries. Among them, power batteries are not only applied to energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace.

[0061] In the embodiments of the present disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0062] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure do not limit this.

[0063] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through at the same time.

[0064] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0065] In some embodiments, the electrode assembly has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0066] In some embodiments, the electrode assembly has a stacked structure.

[0067] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0068] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0069] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0070] As an example, multiple separators can be provided and are respectively arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0071] As an example, the separators can be continuously arranged and are arranged between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0072] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, etc.

[0073] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0074] In some embodiments, the battery cell can include a housing. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing plays a role in protecting the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0075] 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 multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc., and the present disclosure has no particular limitation.

[0076] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap covers the opening. The housing body can be provided with one or more openings. One or more end caps can also be provided.

[0077] In some embodiments, at least one electrode terminal is provided on the outer shell, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector member. The electrode terminal can be provided on the end cap or on the housing.

[0078] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0079] During the use of the battery device, the battery cells in the battery device generate heat. If this heat is too high, it will have an adverse impact on the performance and service life of the battery device. Therefore, how to effectively dissipate the heat of the battery cells of the battery device while improving the reliability of the heat exchange component has become an important research direction in this field.

[0080] In view of this, in order to improve the reliability of the heat exchange component, the embodiments of the present disclosure provide a battery device, which includes a box body component, a heat exchange component, and a plurality of battery cells. The plurality of battery cells are arranged in the box body component. The heat exchange component has at least one medium flow channel inside, and the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells. Wherein, the heat exchange component includes a flexible structure and a rigid structure arranged along a first direction, the Rockwell hardness of the flexible structure is less than that of the rigid structure, the heat exchange component extends along the first direction, and the first direction intersects with the height direction of the box body component.

[0081] The battery device provided by the embodiment of the present application includes a box body assembly, a heat exchange assembly, and a plurality of battery cells. The plurality of battery cells are arranged in the box body assembly, and the box body assembly plays a role in protecting the battery cells. The heat exchange assembly is used for heat exchange with the battery cells. By setting the heat exchange assembly to include a flexible structure and a rigid structure arranged along a first direction, the Rockwell hardness of the flexible structure is less than that of the rigid structure. The heat exchange assembly extends along the first direction, and the first direction intersects with the height direction of the box body assembly. In this way, the rigid structure with a relatively large Rockwell hardness can improve the overall structural strength and stability of the heat exchange assembly, thereby improving the reliability of the heat exchange assembly. In addition, the flexible structure with a relatively small Rockwell hardness has the characteristic of being relatively light in weight, which is beneficial to reducing the weight of the heat exchange assembly. That is to say, while enabling the heat exchange assembly to have a certain structural strength, it is beneficial to reduce the weight of the heat exchange assembly. In addition, the flexible structure has a certain flexibility, which can make the heat exchange assembly better fit with the box body assembly and / or the battery cells, thereby being beneficial to absorbing the assembly tolerance of the heat exchange assembly, without the need to use caulking agents or thermal conductive materials, improving the fit degree between the heat exchange assembly and the box body assembly and / or the battery cells, increasing the effective heat exchange area between the heat exchange assembly and the box body assembly and / or the battery cells, and thus improving the heat exchange effect of the heat exchange assembly. In addition, the flexible structure and the rigid structure can be flexibly connected. That is to say, the connection between the flexible structure and the rigid structure is a connection method that can undergo axial expansion and contraction, folding, and a certain displacement amount perpendicular to the axis. In this way, when the heat exchange assembly is subjected to external force collision or extrusion, the flexible structure and the rigid structure can deform through the flexible connection structure, which can, to a certain extent, improve the situation of damage and liquid leakage of the heat exchange assembly, and thus be beneficial to further improving the reliability of the heat exchange assembly. In addition, the flexible connection structure between the flexible structure and the rigid structure is also beneficial to absorbing the assembly tolerance between the flexible structure and the rigid structure, and thus is beneficial to improving the assembly efficiency of the heat exchange assembly.

[0082] The technical solutions described in the embodiments of the present disclosure are applicable to electrical devices using the battery device. The electrical device includes the battery device of any embodiment of the present disclosure, and the battery device is used to provide electrical energy.

[0083] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a stationary or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and a planer, etc. The embodiments of the present disclosure do not impose special restrictions on the above electrical devices.

[0084] It should be noted that the technical solutions described in the embodiments of the present disclosure are not only applicable to the battery devices described above, but also applicable to all electrical devices including battery devices and energy storage devices. However, for the sake of brevity, the following embodiments will be described by taking an electric vehicle as an example.

[0085] Please refer to Figure 1 , inside the vehicle 1000, a controller 200, a motor 300, and a battery device 100 can be provided. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be provided at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000 and be used for the circuit system of the vehicle 1000, 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 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0086] Please refer to Figure 2, to meet different power usage requirements, the battery device 100 includes a plurality of battery cells 10. A battery cell 10 refers to the smallest unit that makes up a battery module or a battery pack. The plurality of battery cells 10 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that among the plurality of battery cells 10, there are both series and parallel connections. The plurality of battery cells 10 can be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by the plurality of battery cells 10 is accommodated in the box assembly 20; of course, the battery device 100 can also be in the form that a plurality of battery cells 10 are first connected in series, in parallel, or in a combined series-parallel connection to form battery modules, and then the plurality of battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box assembly 20. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing the electrical connection between the plurality of battery cells 10. Among them, each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0087] Please refer to Figures 2 to 5 , an embodiment of the present disclosure provides a battery device 100, which includes a box assembly 20, a heat exchange assembly 30, and a plurality of battery cells 10. The plurality of battery cells 10 are arranged in the box assembly 20. The heat exchange assembly 30 has at least one medium flow channel inside, and at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells 10. Among them, the heat exchange assembly 30 includes a flexible structure 31 and a rigid structure 32 arranged along a first direction. The Rockwell hardness of the flexible structure 31 is less than the Rockwell hardness of the rigid structure 32. The heat exchange assembly 30 extends along the first direction, and the first direction intersects with the height direction of the box assembly 20.

[0088] In the embodiments of the present application, the term "plurality" refers to a quantity of two or more.

[0089] The box assembly 20 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, etc., or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder, or sphere. The material of the box assembly 20 can be an alloy material such as aluminum alloy or ferroalloy, or a polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber reinforced epoxy resin.

[0090] The box assembly 20 is used to encapsulate the battery cells 10, and the box assembly 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 10.

[0091] Exemplarily, the box body assembly 20 is generally a cuboid structure. The length direction and the width direction of the box body assembly 20 are both parallel to the horizontal plane, and the length direction of the box body assembly 20 is parallel to the longest side of the cuboid structure of the box body assembly 20. The height direction of the box body assembly 20 is perpendicular to the ground. Exemplarily, as Figure 2 shown, the length direction of the box body assembly 20 is represented by X, the width direction of the box body assembly 20 is represented by Y, and the height direction of the box body assembly 20 is represented by Z.

[0092] Please refer to Figures 2 to 5 . An embodiment of the present disclosure provides a heat exchange assembly 30. The heat exchange assembly 30 has at least one medium flow channel inside. The at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with a plurality of battery cells 10. Among them, the heat exchange assembly 30 includes a flexible structure 31 and a rigid structure 32 arranged along a first direction. The Rockwell hardness of the flexible structure 31 is less than that of the rigid structure 32. The heat exchange assembly 30 extends along the first direction, and the first direction intersects with the height direction of the box body assembly 20.

[0093] Here, the flexibility in the flexible structure 31 refers to the material property of the structure. Such a type of property can be the property endowed to the material due to the relatively small Rockwell hardness of the material, or can be the property endowed to the material due to at least any one of the properties such as the thickness, strength, elastic modulus, elongation at break, etc. of the material. As an example, the material of the flexible structure 31 can be selected as a material with a smaller Rockwell hardness compared to conventional aluminum plates, steel plates, etc. In addition, the flexible structure 31 also has the characteristic of being lighter in weight, which is beneficial to reducing the weight of the heat exchange assembly 30.

[0094] Here, the rigidity in the rigid structure 32 refers to the material property of the structure. Such a type of property can be the property endowed to the material due to the relatively large Rockwell hardness of the material, or can be the property endowed to the material due to at least any one of the properties such as the thickness, strength, elastic modulus, elongation at break, etc. of the material. As an example, the material of the rigid structure 32 can be selected as a metal plate similar to conventional aluminum plates, steel plates, etc., or a material of a composite plate structure.

[0095] As Figure 4 shown, it can be that the rigid structure 32 is arranged at one end of the flexible structure 31 along the first direction; as Figure 3 shown, it can also be that the rigid structures 32 are arranged at both ends of the flexible structure 31 along the first direction.

[0096] Exemplarily, the Rockwell hardness of the flexible structure 31 is less than that of the rigid structure 32.

[0097] The Rockwell hardness can be an index for determining the hardness value based on the depth of plastic deformation of the indentation.

[0098] The Rockwell hardness of the flexible structure 31 is less than that of the rigid structure 32. In other words, when subjected to a certain pressure, the indentation depth of the flexible structure 31 is greater than that of the rigid structure 32.

[0099] By setting the heat exchange assembly 30 to include the flexible structure 31 and the rigid structure 32, and the Rockwell hardness of the flexible structure 31 is less than that of the rigid structure 32, it is beneficial to improve the impact resistance, buffering performance and puncture resistance of the heat exchange assembly 30.

[0100] Exemplarily, the elastic modulus of at least part of the flexible structure 31 is less than that of the rigid structure 32.

[0101] Here, it can be that the elastic modulus of part of the flexible structure 31 is less than that of the rigid structure 32, or it can be that the elastic modulus of all regions of the flexible structure 31 is less than that of the rigid structure 32.

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

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

[0104] Exemplarily, the medium flow channel can extend along the extension direction of the heat exchange assembly 30. In other words, the medium flow channel can extend along the first direction.

[0105] Here, the first direction intersecting with the height direction of the box assembly 20 means that the first direction is not parallel to the height direction of the box assembly 20. Exemplarily, the first direction is perpendicular to the height direction of the box assembly 20.

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

[0107] It should be noted that the specific number of the medium flow channels is not limited here. It can be one or multiple.

[0108] Exemplarily, the heat exchange assembly 30 further includes an inlet and an outlet, and both the inlet and the outlet are communicated with the medium flow channel.

[0109] Here, the inlet and the outlet of the heat exchange assembly 30 are used to connect with the pipelines of the air conditioning system or the liquid storage device such as a water tank of the whole vehicle or the electrical device.

[0110] Exemplarily, please refer to Figure 3 . The heat exchange assembly 30 further includes a connecting member 34 having an inlet and a connecting member 34 having an outlet. The connecting member 34 is connected to the rigid structure 32.

[0111] Exemplarily, the connecting member 34 is brazed to the rigid structure 32.

[0112] Exemplarily, the connecting member 34 is a water nozzle, for example.

[0113] The principle of the heat exchange assembly 30 for heat-exchanging the battery cells 10 is as follows: The heat exchange medium output by a heat exchange medium source (not shown in the figure) enters the medium flow channel through the inlet of the heat exchange assembly 30. After the heat exchange medium exchanges heat with the battery cells 10, the heat exchange medium flows out through the outlet of the heat exchange assembly 30, completing the heat exchange of the battery cells 10.

[0114] Here, the heat exchange of the heat exchange assembly 30 for the battery cells 10 can be to dissipate heat from the battery cells 10, or can also be to heat the battery cells 10.

[0115] The principle of the heat exchange assembly 30 for dissipating heat from the battery cells 10 is as follows: The heat exchange medium output by the heat exchange medium source enters the medium flow channel through the inlet of the heat exchange assembly 30. After the heat exchange medium absorbs the heat generated during the operation of the battery cells 10, the heat exchange medium flows out through the outlet of the heat exchange assembly 30, releasing heat and completing the cooling and heat dissipation of the battery cells 10.

[0116] The principle of the heat exchange assembly 30 for heating the battery cells 10 is as follows: The heat exchange medium output by the heat exchange medium source enters the medium flow channel through the inlet of the heat exchange assembly 30. The heat exchange medium transfers heat to the battery cells 10 to realize heating of the battery cells 10. After that, the heat exchange medium flows out through the outlet of the heat exchange assembly 30, completing the heating of the battery cells 10.

[0117] Exemplarily, please refer to Figure 2 . The heat exchange assembly 30 is disposed below the plurality of battery cells 10. The area of the heat exchange assembly 30 located at the bottom of the plurality of battery cells 10 is provided as a flexible structure 31, and the area of the heat exchange assembly 30 at least connected to the box body assembly 20 is provided as a rigid structure 32.

[0118] The flexible structure 31 has certain expandable or contractible characteristics. It can also be understood that the flexible structure 31 can be an elastically deformable structure. The flexible structure 31 has the ability to deform and recover from deformation, so that the heat exchange assembly 30 can be formed into a conforming structure. The heat exchange assembly 30 can better adapt to the external contour shape of the battery cells 10 or other components, so as to improve the fitting degree between the heat exchange assembly 30 and the box body assembly 20 and / or the battery cells 10, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the box body assembly 20 and / or the battery cells 10, and further improving the heat exchange efficiency.

[0119] It should be noted that the specific installation position of the heat exchange component 30 is not limited herein.

[0120] Exemplarily, the rigid structure 32 is connected to the box body component 20 by means of welding or screwing.

[0121] In this embodiment, by arranging the heat exchange component 30 below a plurality of battery cells 10 and setting the area of the heat exchange component 30 at the bottom of the plurality of battery cells 10 as the flexible structure 31, thus, it is beneficial to the fitting degree between the heat exchange component 30 and the battery cells 10, increasing the effective heat exchange area between the heat exchange component 30 and the battery cells 10, thereby improving the heat exchange effect of the heat exchange component 30. In addition, by setting the area where the heat exchange component 30 is at least connected to the box body component 20 as the rigid structure 32, it is beneficial to improve the connection reliability of the heat exchange component 30.

[0122] Exemplarily, the heat exchange component 30 can be arranged inside the box body component 20, that is, it can be in direct contact with the battery cells 10. Or it can be arranged outside the box body component 20, that is, the box body component 20 is provided with a receiving cavity 23, and the heat exchange component 30 is arranged outside the receiving cavity 23, and heat is transferred through an intermediate medium, thereby realizing the heat exchange between the heat exchange component 30 and the battery cells 10.

[0123] That is to say, at least part of the heat exchange component 30 is arranged outside the box body component 20 to separate the heat exchange component 30 from the battery cells 10.

[0124] In some other embodiments, the box body component 20 forms a receiving cavity 23, and the heat exchange component 30 can be arranged inside the receiving cavity 23, that is, it can be in direct contact with the battery cells 10.

[0125] The box body component 20 is used to accommodate the battery cells 10, and the box body component 20 can be of various structures. In some embodiments, please continue to refer to Figure 2 , the box body component 20 includes a first box body part 211 and a second box body part 212, and the first box body part 211 and the second box body part 212 cover each other to define a receiving cavity 23 for accommodating the battery cells 10.

[0126] Exemplarily, the second box body part 212 can be a frame structure with openings at both ends, the first box body part 211 is a plate-like structure, the first box body part 211 covers the opening at one end of the second box body part 212, and the heat exchange component 30 is arranged at the opening at the other end of the second box body part 212 to form the receiving cavity 23.

[0127] The first box body part 211 and the second box body part 212 can also both be hollow structures with one side open, and the open side of the first box body part 211 is covered with the open side of the second box body part 212. Of course, the first box body part 211 and the second box body part 212 can be of various shapes, such as a cylinder, a cuboid, etc.

[0128] To improve the sealing performance after the connection between the first box body part 211 and the second box body part 212, a sealing member can also be provided between the first box body part 211 and the second box body part 212, such as sealant, sealing ring, etc.

[0129] Assume that the first box body part 211 covers the top of the second box body part 212. The first box body part 211 can also be called the upper box cover, and the second box body part 212 can also be called the lower box cover.

[0130] Exemplarily, please continue to refer to Figure 2 , the battery device 100 further includes a bottom guard plate 22, and the bottom guard plate 22 is disposed at the bottom of the box body assembly 20.

[0131] Here, by disposing the bottom guard plate 22 at the bottom of the box body assembly 20, it can be used to protect the box body assembly 20, reduce the impact of external debris on the box body assembly 20 during driving, so as to improve the reliability of the battery device 100.

[0132] In some embodiments, the flexible structure 31 and the rigid structure 32 are connected by hot pressing, and this connection method is simple and reliable.

[0133] Here, the flexible structure 31 is sealed by a hot pressing process. Through the hot pressing process, it can effectively ensure that the heat exchange component 30 has good sealing performance and is not easy to crack.

[0134] In the embodiments of the present application, by setting the heat exchange component 30 to include a flexible structure 31 and a rigid structure 32, the flexible structure 31 and the rigid structure 32 are connected by hot pressing, and 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 improving the structural strength of the heat exchange component 30.

[0135] Exemplarily, the first direction can be the length direction of the box body assembly 20, or the width direction of the box body assembly 20.

[0136] Exemplarily, the extending direction of the medium flow channel can be parallel to the first direction, intersect with the first direction, or be perpendicular to the first direction.

[0137] The battery device 100 provided by the embodiment of the present application includes a box body assembly 20, a heat exchange assembly 30, and a plurality of battery cells 10. The plurality of battery cells 10 are arranged in the box body assembly 20, and the box body assembly 20 plays a role in protecting the battery cells 10. The heat exchange assembly 30 is used for heat exchange with the battery cells 10. By setting the heat exchange assembly 30 to include a flexible structure 31 and a rigid structure 32 arranged along a first direction, the Rockwell hardness of the flexible structure 31 is less than that of the rigid structure 32. The heat exchange assembly 30 extends along the first direction, and the first direction intersects with the height direction of the box body assembly 20. In this way, the rigid structure 32 with relatively high Rockwell hardness can play a role in improving the overall structural strength and stability of the heat exchange assembly 30, thereby improving the reliability of the heat exchange assembly 30. In addition, the flexible structure 31 with relatively low Rockwell hardness has the characteristic of relatively light weight, which is beneficial to reducing the weight of the heat exchange assembly 30. That is to say, while enabling the heat exchange assembly 30 to have a certain structural strength, it is beneficial to reduce the weight of the heat exchange assembly 30. In addition, the flexible structure 31 has a certain flexibility, which can make the heat exchange assembly 30 better fit with the box body assembly 20 and / or the battery cells 10, thereby being beneficial to absorbing the assembly tolerance of the heat exchange assembly 30, without the need to use caulking agents or thermal conductive materials, improving the fit degree between the heat exchange assembly 30 and the box body assembly 20 and / or the battery cells 10, increasing the effective heat exchange area between the heat exchange assembly 30 and the box body assembly 20 and / or the battery cells 10, and thus improving the heat exchange effect of the heat exchange assembly 30. In addition, the flexible structure 31 and the rigid structure 32 can be flexibly connected. That is to say, the connection between the flexible structure 31 and the rigid structure 32 is a connection method that can undergo axial expansion and contraction, folding, and a certain displacement amount perpendicular to the axis. In this way, when the heat exchange assembly 30 is subjected to external force collision or extrusion, the flexible structure 31 and the rigid structure 32 can deform through the flexible connection structure, which can, to a certain extent, improve the situation of breakage and leakage of the heat exchange assembly 30, and thus be beneficial to further improving the reliability of the heat exchange assembly 30. In addition, the flexible connection structure between the flexible structure 31 and the rigid structure 32 is also beneficial to absorbing the assembly tolerance between the flexible structure 31 and the rigid structure 32, and thus is beneficial to improving the assembly efficiency of the heat exchange assembly 30.

[0138] In some embodiments, the flexible structure 31 is set as a metal part, and the Rockwell hardness of the flexible structure 31 is in the range of HRB50 to HRB6000.

[0139] That is to say, the flexible structure 31 can be set as a metal part with relatively low Rockwell hardness. Exemplarily, the flexible structure 31 can be set as a metal with relatively low Rockwell hardness such as aluminum, copper, low-carbon steel, etc.

[0140] The Rockwell hardness of the flexible structure 31 of the metal part can be the point value of any one of HRB50, HRB100, HRB200, HRB300, HRB500, HRB800, HRB1000, HRB1300, HRB1500, HRB2000, HRB2500, HRB2800, HRB3000, HRB3500, HRB4000, HRB4500, HRB4800, HRB5000, HRB5500, HRB5700, HRB6000 or the point value between any two of them.

[0141] In this embodiment, by setting the flexible structure 31 as a metal part and setting the Rockwell hardness of the flexible structure 31 of the metal part to be in the range of HRB50 to HRB6000, the flexible structure 31 can have a certain structural strength and flexibility.

[0142] In some embodiments, the flexible structure 31 is set as a non-metal part, and the Rockwell hardness of the flexible structure 31 is in the range of HRR5000 to HRR150000.

[0143] That is to say, the flexible structure 31 can be set as a non-metal part with a relatively low Rockwell hardness. Exemplarily, the flexible structure 31 can be set as non-metals with a relatively low Rockwell hardness such as polymer materials (such as rubber and plastic).

[0144] Exemplarily, the flexible structure 31 can be set as polyethylene, polyvinyl chloride, polypropylene, polycarbonate, nylon, etc.

[0145] The Rockwell hardness of the flexible structure 31 of the non-metal part can be the point value of any one of HRR5000, HRR10000, HRR20000, HRR30000, HRR40000, HRR50000, HRR60000, HRR70000, HRR80000, HRR90000, HRR100000, HRR110000, HRR120000, HRR130000, HRR140000, HRR150000 or the point value between any two of them.

[0146] In this embodiment, by setting the flexible structure 31 as a non-metal part and setting the Rockwell hardness of the flexible structure 31 of the non-metal part to be in the range of HRR5000 to HRR150000, the flexible structure 31 can have a certain structural strength and flexibility.

[0147] In some embodiments, the flexible structure 31 is set as a metal matrix composite part, and the Rockwell hardness of the flexible structure 31 is in the range of HRB50 to HRB6000.

[0148] Metal matrix composites (MMCs) are composites artificially combined with a metal and its alloy as the matrix and one or several metal or non-metal reinforcing phases. Most of its reinforcing materials are inorganic non-metals, such as ceramics, carbon, graphite, boron, etc., and metal wires can also be used. Together with polymer matrix composites, ceramic matrix composites, and carbon / carbon composites, they constitute a modern composite material system.

[0149] The Rockwell hardness of the flexible structure 31 of the metal matrix composite part can be the point value of any one of HRB50, HRB100, HRB200, HRB300, HRB500, HRB800, HRB1000, HRB1300, HRB1500, HRB2000, HRB2500, HRB2800, HRB3000, HRB3500, HRB4000, HRB4500, HRB4800, HRB5000, HRB5500, HRB5700, HRB6000 or the point value between any two of them.

[0150] In this embodiment, by setting the flexible structure 31 as a metal matrix composite part and setting the Rockwell hardness of the flexible structure 31 of the metal matrix composite part to be in the range of HRB50 to HRB6000, the flexible structure 31 can have a certain structural strength and flexibility.

[0151] In some embodiments, the flexible structure 31 is set as a polymer matrix composite part, and the Rockwell hardness of the flexible structure 31 is in the range of HRR5000 to HRR150000.

[0152] Polymer Matrix Composites (PMCs) are high-performance materials formed with a polymer as the matrix by adding reinforcing materials (such as fibers, particles, etc.). Its core feature is to comprehensively improve the material properties through the synergistic effect of the matrix and the reinforcement.

[0153] The matrix is usually a thermosetting or thermoplastic polymer such as epoxy resin, polyphenylene ether, polyimide, etc.

[0154] The matrix plays the role of bonding the reinforcement, transmitting the load, and protecting the reinforcement.

[0155] Exemplarily, the reinforcement can be fiber-like and / or particle-like.

[0156] The fiber-like can be glass fiber, carbon fiber, aramid fiber (such as Kevlar), etc.

[0157] The particle-like can be inorganic fillers (such as clay, talc), nanomaterials (such as graphene), etc.

[0158] The Rockwell hardness of the flexible structure 31 of the polymer matrix composite part can be the point value of any one of HRR5000, HRR10000, HRR20000, HRR30000, HRR40000, HRR50000, HRR60000, HRR70000, HRR80000, HRR90000, HRR100000, HRR110000, HRR120000, HRR130000, HRR140000, HRR150000 or the point value between any two of them.

[0159] In this embodiment, by setting the flexible structure 31 as a polymer matrix composite part and setting the Rockwell hardness of the flexible structure 31 of the polymer matrix composite part to be in the range of HRR5000 to HRR150000, the flexible structure 31 can have a certain structural strength and flexibility.

[0160] Exemplarily, the elongation at break of the flexible structure 31 is greater than that of the rigid structure 32.

[0161] The elongation at break is a percentage index of the elongation amount at the time of tensile fracture of the material to its original length. It is used to measure the deformation ability that the material can withstand during the tensile process, that is, the elongation at break represents the ductility of the material when it is stressed in tension.

[0162] The elongation at break of the flexible structure 31 is greater than that of the rigid structure 32. In other words, when stressed in tension, the ductility of the flexible structure 31 is greater than that of the rigid structure 32.

[0163] By setting the heat exchange assembly 30 to include the flexible structure 31 and the rigid structure 32, and the elongation at break of the flexible structure 31 is greater than that of the rigid structure 32, it is beneficial to improve the impact resistance, buffering performance and puncture resistance of the heat exchange assembly 30.

[0164] In some embodiments, the elongation at break of the flexible structure 31 is in the range of 10% to 100%.

[0165] The elongation at break of the flexible structure 31 can be the point value of any one of 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% or the point value between any two of them.

[0166] In this embodiment, by setting the elongation at break of the flexible structure 31 to be in the range of 10% to 100%, the flexible structure 31 can have a certain impact resistance and puncture resistance while also having a certain structural strength.

[0167] In some embodiments, the fracture elongation rate of the rigid structure 32 ranges from 1% to 50%.

[0168] The fracture elongation rate of the rigid structure 32 can be a point value of any one of 1%, 3%, 5%, 6%, 8%, 9%, 10%, 13%, 15%, 16%, 17%, 19%, 20%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 43%, 45%, 48%, 50% or a point value between any two of them.

[0169] In this embodiment, by setting the fracture elongation rate of the rigid structure 32 to range from 1% to 50%, the rigid structure 32 can have sufficient structural strength, which is beneficial to improving the overall structural strength of the heat exchange assembly 30.

[0170] In some embodiments, the elastic modulus of at least a part of the flexible member is less than that of the rigid member.

[0171] In some embodiments, the elastic modulus of the flexible structure 31 ranges from 1 GPa to 200 GPa.

[0172] Exemplarily, the elastic modulus of the flexible structure 31 can be a point value of any one of 1 GPa, 5 GPa, 8 GPa, 10 GPa, 15 GPa, 20 GPa, 30 GPa, 50 GPa, 58 GPa, 60 GPa, 80 GPa, 90 GPa, 100 GPa, 120 GPa, 135 GPa, 150 GPa, 160 GPa, 180 GPa, 200 GPa or a point value between any two of them.

[0173] The elastic modulus describes the magnitude of the unit strain caused by the unit stress when a solid is stressed within a certain range, and it is one of the basic physical quantities of materials. The larger the elastic modulus, the greater the stiffness of the material and the stronger the compressive capacity. The elastic modulus is a physical quantity that describes the elasticity of a substance.

[0174] In this embodiment, by setting the elastic modulus of the flexible structure 31 to range from 1 GPa to 200 GPa, the flexible structure 31 not only has a certain structural strength to improve the reliability of the heat exchange assembly 30, but also has a certain deformation ability, which can enhance the fitting degree between the heat exchange assembly 30 and the box body assembly 20 and / or the battery cell 10, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the box body assembly 20 and / or the battery cell 10, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30.

[0175] In some embodiments, the flexible structure 31 is closer to the battery cell 10 than the rigid structure 32, and the thermal conductivity of the flexible structure 31 is greater than that of the rigid structure 32.

[0176] That is to say, the flexible structure 31 is arranged close to the battery cell 10, and the rigid structure 32 is arranged on the side of the flexible structure 31 away from the battery cell 10.

[0177] Here, the thermal conductivity is a physical quantity that measures the heat conduction ability of a substance. It refers to the amount of heat transferred through an area of 1 square meter in 1 second under stable heat transfer conditions, with a temperature difference of 1 degree (K or °C) between the two surfaces of a material that is 1 meter thick. The larger the thermal conductivity, the better the corresponding heat conduction efficiency.

[0178] In this embodiment, by arranging the flexible structure 31 closer to the battery cell 10 than the rigid structure 32 and making the thermal conductivity of the flexible structure 31 greater than that of the rigid structure 32, on the one hand, it is beneficial to improve the heat exchange between the heat exchange medium and the battery cell 10 through the flexible structure 31, thereby enhancing the heat exchange efficiency. On the other hand, it can improve the diffusion of the heat of the heat exchange medium through the rigid structure 32, which is beneficial to improving the heat preservation performance of the heat exchange assembly 30 and further enhancing the heat exchange efficiency.

[0179] In this embodiment, the thermal conductivity of the flexible structure 31 is in the range of 0.2 W / m·K to 800 W / m·K.

[0180] The thermal conductivity of the flexible structure 31 can be any point value within the range of 0.2 W / m·K, 1 W / m·K, 10 W / m·K, 20 W / m·K, 50 W / m·K, 100 W / m·K, 150 W / m·K, 200 W / m·K, 260 W / m·K, 300 W / m·K, 340 W / m·K, 400 W / m·K, 480 W / m·K, 500 W / m·K, 570 W / m·K, 600 W / m·K, 600 W / m·K, 800 W / m·K or any point value between any two of them.

[0181] In this embodiment, by setting the thermal conductivity of the flexible structure 31 in the range of 0.2 W / m·K to 800 W / m·K, it is beneficial to improve the heat exchange between the heat exchange medium and the battery cell 10 through the flexible structure 31, thereby enhancing the heat exchange efficiency.

[0182] In this embodiment, the thermal conductivity of the rigid structure 32 is in the range of 0.01 W / m·K to 400 W / m·K.

[0183] The thermal conductivity of the rigid structure 32 can be a point value of any one of 0.01 W / m·K, 0.02 W / m·K, 0.05 W / m·K, 0.08 W / m·K, 0.1 W / m·K, 0.12 W / m·K, 0.15 W / m·K, 0.18 W / m·K, 0.2 W / m·K, 1 W / m·K, 10 W / m·K, 20 W / m·K, 50 W / m·K, 88 W / m·K, 100 W / m·K, 180 W / m·K, 200 W / m·K, 230 W / m·K, 300 W / m·K, 360 W / m·K, 400 W / m·K or a point value between any two of them.

[0184] In this embodiment, by setting the thermal conductivity of the rigid structure 32 to be in the range of 0.01 W / m·K to 400 W / m·K, it is beneficial to improve the diffusion of the heat of the heat exchange medium through the rigid structure 32, beneficial to improving the heat preservation performance of the heat exchange assembly 30, and beneficial to further enhancing the heat exchange efficiency.

[0185] In some embodiments, the flexible structure 31 includes a metalized film.

[0186] The flexible structure 31 is a single-layer or multi-layer film.

[0187] Here, the metalized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0188] In this embodiment, since the metalized film has a thin thickness and a small weight, and a medium flow channel is formed between the metalized film and the heat exchange member, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the overall thickness and weight of the heat exchange assembly 30 can be reduced. At the same time, since the heat exchange assembly 30 has the characteristic of insulation, the possibility of insulation failure can be reduced. The risk of reaction between the heat exchange assembly 30 and the heat exchange medium flowing inside is reduced, and the possibility of corrosion and leakage of the heat exchange medium is further reduced.

[0189] Exemplarily, the flexible structure 31 includes an aluminum-plastic film.

[0190] The aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation.

[0191] In some embodiments, the flexible structure 31 is a layered structure. The flexible structure 31 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are sequentially stacked.

[0192] Here, the flexible structure 31 includes a metal layer and a non-metal layer, that is, a composite material part composed of a metal layer and a non-metal layer.

[0193] Exemplarily, between the metal layer and the non-metal layer can be formed by hot pressing or hot melting.

[0194] Here, the number of metal layers and non-metal layers is not limited.

[0195] In this embodiment, the flexible structure 31 formed by laminating metal layers and non-metal layers in sequence has a thin thickness and a small weight. Moreover, by forming a dielectric flow channel between the flexible structure 31 and the rigid structure 32, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component 30 can be reduced. In addition, the heat exchange component 30 will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0196] In some embodiments, the flexible structure 31 is a layered structure. The flexible structure 31 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are laminated in sequence. Among them, the non-metal layer is disposed on one side of the metal layer facing the rigid structure 32.

[0197] That is to say, the non-metal layer is located between the metal layer and the rigid structure 32.

[0198] Here, by disposing the non-metal layer on one side of the metal layer facing the rigid structure 32, the non-metal layer can be thermally pressed and connected to the rigid structure 32.

[0199] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0200] By setting the metal layer as one or more of aluminum foil, copper foil, and steel foil, the flexible structure 31 can have a certain structural strength and can play an isolation role.

[0201] In some embodiments, the non-metal layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0202] By setting the non-metal layer as one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible structure 31 can have a certain waterproof effect.

[0203] Exemplarily, a non-metal layer made of a corrosion-resistant material with acid and alkali corrosion resistance can also be selected, or in other words, additives can be added to the non-metal layer to make the non-metal layer have acid and alkali corrosion resistance.

[0204] In some embodiments, the non-metal layer is a hot melt layer.

[0205] Here, by setting the non-metal layer as a hot melt layer, that is, composed of a hot melt material, it is beneficial to make the non-metal layer and the metal layer composite together through hot melting, with simple molding and high production efficiency.

[0206] In some embodiments, please refer to Figure 5, the flexible structure 31 is a layered structure. The flexible structure 31 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 medium flow channel than the second anti-corrosion layer 315.

[0207] Here, the second anti-corrosion layer 315 can be a nylon layer formed of nylon material, so as to have certain corrosion resistance, for example, acid and alkali corrosion resistance.

[0208] The isolation layer 314 can be a metal layer. The metal layer can be set as one or more of aluminum foil, copper foil, and steel foil, which can make the flexible structure 31 have certain structural strength and can play an isolation role.

[0209] The first anti-corrosion layer 313 can be a non-metal layer. The non-metal layer can be set as one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, which can make the flexible structure 31 have certain waterproof effect.

[0210] In this embodiment, by setting the flexible structure 31 to include a first anti-corrosion layer 313, an isolation layer 314, and a second anti-corrosion layer 315 arranged in sequence, and the second anti-corrosion layer 315 is closer to the medium flow channel than the first anti-corrosion layer 313, it is beneficial to improve the reliability of the heat exchange component 30. In addition, due to the setting of the first anti-corrosion layer 313, the flexible structure 31 does not need to be painted additionally to play an anti-corrosion role, which is beneficial to further reduce costs.

[0211] In some embodiments, the thickness of the isolation layer 314 is 6.5μm - 100μm.

[0212] The thickness of the isolation layer 314 can be any point value among 6.5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 38μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm or the point value between any two of them.

[0213] In this embodiment, by setting the thickness of the isolation layer 314 to 6.5μm - 100μm, the flexible structure 31 can have certain structural strength and flexibility.

[0214] In some embodiments, the thickness of the isolation layer 314 is 6.5μm - 15μm.

[0215] The thickness of the isolation layer 314 can be a point value of any one of 6.5μm, 7μm, 7.5μm, 7.8μm, 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 a point value between any two of them.

[0216] In this embodiment, by setting the thickness of the isolation layer 314 to 6.5μm - 15μm, the flexible structure 31 can further have a certain structural strength and flexibility.

[0217] In some embodiments, the thickness of the second anti-corrosion layer 315 is 5μm - 20μm.

[0218] The thickness of the second anti-corrosion layer 315 can be a point value of any one of 5μm, 5.5μm, 5.8μm, 6μm, 6.5μm, 7μm, 7.5μm, 7.8μm, 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, 15.5μm, 16μm, 16.5μm, 17μm, 17.5μm, 18μm, 18.5μm, 18.7μm, 19μm, 19.5μm, 20μm or a point value between any two of them.

[0219] In this embodiment, by setting the thickness of the second anti-corrosion layer 315 to 5μm - 20μm, the wear resistance and toughness of the flexible structure 31 can be improved.

[0220] In some embodiments, the thickness of the first anti-corrosion layer 313 is 50μm - 120μm.

[0221] The thickness of the first anti-corrosion layer 313 can be a point value of any one of 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm, 105μm, 108μm, 110μm, 115μm, 120μm or a point value between any two of them.

[0222] 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 also facilitate the thermal compression connection of the flexible structure 31 through the first anti-corrosion layer 313.

[0223] In some embodiments, the thickness of the flexible structure 31 is 0.05 mm - 0.3 mm.

[0224] For example, it can be a point value of any one of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.25 mm, 0.27 mm, 0.28 mm, 0.3 mm or a point value between any two of them.

[0225] In this embodiment, by setting the thickness of the flexible structure 31 to 0.05 mm - 0.3 mm, while the heat exchange component 30 made of the flexible structure 31 has a certain structural strength, the overall thickness of the heat exchange component 30 is relatively small, which is beneficial to reducing the overall volume and weight of the battery device 100, so as to increase the energy density of the battery device 100.

[0226] In some embodiments, the thickness of the flexible structure 31 is 0.08 mm - 0.2 mm.

[0227] For example, it can be a point value of any one of 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm or a point value between any two of them.

[0228] In this embodiment, by setting the thickness of the flexible structure 31 to 0.08 mm - 0.2 mm, while the heat exchange component 30 made of the flexible structure 31 has a certain structural strength, it further makes the overall thickness of the heat exchange component 30 relatively small, which is beneficial to further reducing the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0229] It should be noted that the specific material of the rigid structure 32 is not limited here.

[0230] In some embodiments, the rigid structure 32 is set as a metal plate.

[0231] Exemplarily, for example, it can be aluminum alloy.

[0232] In this embodiment, by setting the rigid structure 32 as a metal plate, the metal plate has good structural strength, and can also enable the rigid structure 32 to play a certain supporting role on the flexible structure 31.

[0233] The measurement methods of the elastic modulus of the flexible structure 31 may 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 instruments may include a nanoindenter and a universal testing machine.

[0234] Exemplarily, at normal temperature and pressure, the elastic modulus of the flexible structure 31 can be measured by the nanoindentation method. The nanoindentation method uses a tiny indenter to indent the surface of the flexible structure 31, and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0235] Exemplarily, at normal temperature and pressure, the fracture elongation of the flexible structure 31 and the rigid structure 32 can be measured by a tensile test method or a drop hammer test method. The measuring instrument may include a universal testing machine.

[0236] Exemplarily, the test of the thermal conductivity coefficient is divided into a dynamic method and a steady-state method, and the steady-state method is further divided into a heat flow meter method and a guarded hot plate method.

[0237] In the description of the present disclosure, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in still other embodiments", or "exemplary", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine the different embodiments or examples described in the present disclosure and the features of the different embodiments or examples.

[0238] The above are only the preferred embodiments of the present application, and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. 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, Comprising: A box body assembly; A plurality of battery cells, the plurality of battery cells being disposed within the box body assembly; A heat exchange assembly, the heat exchange assembly having at least one medium flow channel therein, the at least one medium flow channel being for conducting a heat exchange medium, the heat exchange medium being for exchanging heat with the plurality of battery cells; Wherein, the heat exchange assembly includes a flexible structure and a rigid structure arranged in a first direction, the Rockwell hardness of the flexible structure being less than the Rockwell hardness of the rigid structure, the heat exchange assembly extending in the first direction, and the first direction intersecting with the height direction of the box body assembly.

2. The battery device according to claim 1, wherein, The heat exchange assembly is disposed below the plurality of battery cells, a region of the heat exchange assembly located at the bottom of the plurality of battery cells being set as the flexible structure, and at least a region of the heat exchange assembly connected to the box body assembly being set as the rigid structure.

3. The battery device according to claim 1, wherein The flexible structure is set as a metal part, the Rockwell hardness of the flexible structure being in the range of HRB50 to HRB6000.

4. The battery device according to claim 1, characterized in that, The flexible structure is set as a non-metal part, the Rockwell hardness of the flexible structure being in the range of HRR5000 to HRR150000.

5. The battery device according to claim 1, characterized in that, The flexible structure is set as a metal matrix composite part, the Rockwell hardness of the flexible structure being in the range of HRB50 to HRB6000.

6. The battery device according to claim 1, wherein, The flexible structure is set as a polymer matrix composite part, the Rockwell hardness of the flexible structure being in the range of HRR5000 to HRR150000.

7. The battery device according to any one of claims 1 to 6, characterized in that, The fracture elongation rate of the flexible structure is in the range of 10% to 100%.

8. The battery device according to any one of claims 1 to 6, characterized in that, The elastic modulus of the flexible structure is in the range of 1 GPa to 200 GPa.

9. The battery device according to claim 1, characterized in that, The flexible structure is closer to the battery cell than the rigid structure, and the thermal conductivity of the flexible structure is greater than the thermal conductivity of the rigid structure.

10. The battery device according to claim 9, wherein The thermal conductivity of the flexible structure is in the range of 0.2 W / m·K to 800 W / m·K; And / or The thermal conductivity of the rigid structure is in the range of 0.01 W / m·K to 400 W / m·K.

11. The battery device according to claim 1, wherein, The flexible structure is a layered structure, the flexible structure including a metal layer and a non-metal layer, the metal layer and the non-metal layer being sequentially stacked.

12. The battery device according to claim 11, wherein, The metal layer includes one or more of aluminum foil, copper foil, and steel foil; and / or The non-metal layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

13. The battery device according to claim 11, wherein The non-metal layer is a hot melt layer.

14. The battery device according to claim 1, wherein, The flexible structure is a layered structure, the flexible structure including a first anti-corrosion layer, an isolation layer, and a second anti-corrosion layer arranged in sequence, the first anti-corrosion layer being closer to the medium flow channel than the second anti-corrosion layer.

15. The battery device according to claim 1, characterized in that, The flexible structure includes a metal plastic film.

16. The battery device according to claim 15, characterized in that, The flexible structure includes an aluminum plastic film.

17. The battery device according to claim 1, characterized in that, The thickness of the flexible structure is 0.05 mm - 0.3 mm.

18. A heat exchange component, characterized in that, The heat exchange assembly has at least one medium flow channel therein, the at least one medium flow channel being for conducting a heat exchange medium, the heat exchange medium being for exchanging heat with the battery cell; Among them, the heat exchange component includes a flexible structure and a rigid structure arranged along a first direction. The Rockwell hardness of the flexible structure is less than that of the rigid structure. The heat exchange component extends along the first direction, and the first direction intersects with the height direction of the box body component.

19. An electrical device, characterized in that, It includes the battery device according to any one of claims 1 to 17 or the heat exchange component according to claim 18.

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