Battery device, refrigerant heat exchange assembly and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery device, a refrigerant heat exchange assembly and an electric device. A battery cell assembly; the refrigerant heat exchange assembly comprises a base body and a refrigerant flow channel structure arranged in the base body, the base body is connected to the box body and located on one side of the battery single body assembly, a partition plate connected to the base body is arranged in the refrigerant flow channel structure, and the refrigerant flow channel structure is divided into a first cavity and a second cavity by the partition plate; the interior of the first cavity is configured to be used for containing a first heat exchange medium. The second cavity is formed in one side, deviating from the battery monomer assembly, of the first cavity; according to the battery device provided by the embodiment of the invention, the partition plate is arranged in the refrigerant flow channel structure of the refrigerant heat exchange assembly, so that the refrigerant flow channel structure is divided into the first cavity and the second cavity through the partition plate, and the second cavity is formed in the side, far away from the battery monomers, of the first cavity, so that energy generated by collision is absorbed through the second cavity; therefore, interference of collision on flowing of the first heat exchange medium is reduced, and negative effects of collision on the refrigerant heat exchange assembly are reduced.

Description

[0001] This application claims priority to Chinese Patent Application No. 202420907842.4, filed with the State Intellectual Property Office of China on April 28, 2024, entitled "Heat Exchanger, Battery and Electrical Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of battery technology, and in particular relates to a battery device, a refrigerant heat exchange component, and an electrical device. Background Technology

[0003] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0004] In current battery devices, the strength of refrigerant heat exchange components (such as cold plates) is usually low. When the battery device is subjected to impact, the refrigerant heat exchange components are prone to deformation, which can easily lead to a decrease in the heat exchange efficiency of the refrigerant heat exchange components and have a negative impact on the normal operation of the battery device. Utility Model Content

[0005] In view of the above problems, this application provides a battery device, a refrigerant heat exchange component, and an electrical device, which can alleviate the problem of refrigerant heat exchange components being easily deformed by impacts.

[0006] In a first aspect, embodiments of this application provide a battery device, comprising:

[0007] A housing; a battery cell assembly housed within the housing; a refrigerant heat exchange assembly including a substrate and a refrigerant flow channel structure disposed within the substrate, the substrate being connected to the housing and located on one side of the battery cell assembly, the refrigerant flow channel structure having a partition plate connected to the substrate, the partition plate dividing the refrigerant flow channel structure into a first cavity and a second cavity, the first cavity being configured to contain and supply a first heat exchange medium for flow to exchange heat with the battery cell assembly; at least a portion of the second cavity being disposed on the side of the first cavity opposite to the battery cell assembly.

[0008] In this embodiment, a partition plate is provided within the refrigerant flow channel structure of the refrigerant heat exchange component to divide the refrigerant flow channel structure into a first cavity and a second cavity. The first cavity is used to supply the flow of the first heat exchange medium to control the temperature of the battery cell. The second cavity is located on the side of the first cavity away from the battery cell so as to absorb the energy generated by the collision, thereby reducing the interference of the collision on the flow of the first heat exchange medium, improving the stability of the refrigerant heat exchange component, and reducing the negative impact of the collision on the battery device.

[0009] In some embodiments, the strength of the part of the substrate corresponding to the first cavity is greater than the strength of the part of the substrate corresponding to the second cavity.

[0010] In this embodiment, the strength of the part of the substrate corresponding to the first cavity is greater than the strength of the part of the substrate corresponding to the second cavity. When the refrigerant heat exchange assembly is impacted, this setting allows the part of the substrate located in the second cavity to deform first and absorb and consume the impact energy through deformation, thereby reducing the impact energy transmitted to the part of the substrate located in the first cavity, reducing the deformation risk of the part of the substrate located in the first cavity, and reducing the interference caused by the impact on the flow of the first heat exchange medium.

[0011] In some embodiments, a first plate connected to the base and / or partition plate is provided in the first cavity, and a second plate connected to the base and / or partition plate is provided in the second cavity; on the projection plane perpendicular to the length direction of the refrigerant flow channel structure, the sum of the orthographic projection areas of the first plate is greater than the sum of the orthographic projection areas of the second plate.

[0012] In the technical solution of this embodiment, a first plate and a second plate are respectively provided in the first cavity and the second cavity to improve the strength of the substrate. At the same time, the orthographic projection area of ​​the first plate is larger than the orthographic projection area of ​​the second plate so that the strength of the first plate is greater than the strength of the second plate. This allows the substrate to deform first at the second cavity and absorb and dissipate collision energy, reducing the collision energy transmitted to the part of the substrate located at the first cavity.

[0013] In some embodiments, the number of first plates is greater than the number of second plates.

[0014] In this embodiment, the number of first plates is greater than the number of second plates, so that the sum of the strengths of the first plates is greater than the sum of the strengths of the second plates. This makes the strength of the part of the substrate corresponding to the first cavity greater than the strength of the part of the substrate corresponding to the second cavity. When the refrigerant heat exchange assembly is impacted, this arrangement allows the substrate to deform first at the second cavity and absorb and dissipate the impact energy, thereby reducing the impact energy transmitted to the part of the substrate located at the first cavity.

[0015] In some embodiments, the thickness of the first plate is greater than the thickness of the second plate.

[0016] In this embodiment, the thickness of the first plate is greater than the thickness of the second plate, so that the strength of the first plate is greater than the strength of the second plate, thereby making the strength of the part of the substrate corresponding to the first cavity greater than the strength of the part of the substrate corresponding to the second cavity. When the refrigerant heat exchange component is impacted, this arrangement enables the substrate to deform first at the second cavity and absorb and dissipate the impact energy, thereby reducing the impact energy transmitted to the part of the substrate located at the first cavity.

[0017] In some embodiments, one side of the first plate is connected to a partition plate and the other side of the first plate is connected to a base to divide the first cavity into at least two first sub-cavities; and / or, one side of the second plate is connected to a partition plate and the other side of the second plate is connected to a base to divide the second cavity into at least two second sub-cavities.

[0018] In the technical solution of this embodiment, the two sides of the first plate and the second plate are respectively connected to the base and the partition plate, so that the first plate and the second plate can better support the base; at the same time, this arrangement can also divide the first cavity into multiple first sub-cavities, so as to control the flow and state of the first heat exchange medium in the first cavity.

[0019] In some embodiments, in the arrangement direction of the first cavity and the second cavity, the size of the first cavity is smaller than the size of the second cavity.

[0020] In this embodiment, the height of the first cavity is less than the height of the second cavity, so that the volume of the first cavity is less than the volume of the second cavity. This allows the strength of the substrate in the second cavity to be lower than the strength of the substrate in the first cavity. When the refrigerant heat exchange component is impacted, this arrangement allows the substrate to have a larger deformation space in the second cavity, thereby allowing the substrate to have a larger deformation and absorb more impact energy in the second cavity.

[0021] In some embodiments, the substrate includes a first part and a second part connected to the first part, the first part and the partition plate forming a first cavity, and the second part and the partition plate forming a second cavity; the thickness of the first part is greater than the thickness of the second part.

[0022] In the technical solution of this embodiment, the thickness of the first part of the substrate is greater than the thickness of the second part, so that the strength of the first part is greater than the strength of the second part. When the refrigerant heat exchange component is impacted, this setting enables the second part to deform first and absorb and dissipate the impact energy, thereby reducing the impact energy transmitted to the first part.

[0023] In some embodiments, the second cavity contains a second heat exchange medium, which is configured to flow within the second cavity.

[0024] In the technical solution of this embodiment, a second heat exchange medium is provided in the second cavity to adjust the temperature distribution of the first heat exchange medium. At this time, the second cavity and the second heat exchange medium can not only absorb and consume collision energy, but also perform temperature equalization treatment on the first heat exchange medium in the first cavity.

[0025] In some embodiments, the second cavity is a closed space structure, and the second heat exchange medium is a phase change material.

[0026] In the technical solution of this embodiment, the second heat exchange medium is a phase change material, and the second cavity is a closed space structure. The phase change material can absorb heat and undergo phase change at a higher temperature, and the phase change material after phase change can flow to a lower temperature position and release heat, thereby achieving the effect of making the temperature distribution of the first heat exchange medium in the first cavity more uniform.

[0027] In some embodiments, the second cavity is a circulating space structure, and the second heat exchange medium is configured to circulate within the second cavity.

[0028] In the technical solution of this embodiment, the second cavity is a circulating space structure, and the second heat exchange medium can circulate within the second cavity. During the circulation process, the second heat exchange medium can transport heat from a high temperature area to a low temperature area, thereby achieving the effect of making the temperature distribution of the first heat exchange medium in the first cavity more uniform.

[0029] In some embodiments, the substrate is a one-piece molded structural component.

[0030] In the technical solution of this embodiment, the substrate is made into an integrally molded structural component to reduce the installation difficulty of the substrate, while improving the overall strength and consistency of the substrate.

[0031] In some embodiments, the substrate is a pipe structure.

[0032] In this embodiment, the substrate is designed as a pipe structure to simplify its structure and reduce its space requirements.

[0033] In some embodiments, the substrate is an integrally extruded structure, and the substrate is bent to form a refrigerant heat exchange component.

[0034] In the technical solution of this embodiment, the matrix is ​​made into an integral extrusion structure to improve the integrity and strength of the matrix and improve the sealing performance of the matrix; at the same time, the integrally extruded matrix also has the advantages of smooth internal flow resistance, flexible material selection, and high production efficiency.

[0035] Secondly, this application also provides a refrigerant heat exchange component, comprising:

[0036] The device includes a substrate and a refrigerant flow channel structure disposed within the substrate. The refrigerant flow channel structure is provided with a partition plate connected to the substrate. The partition plate divides the refrigerant flow channel structure into a first cavity and a second cavity. The first cavity is configured to accommodate a first heat exchange medium and supply the first heat exchange medium with flow. At least a portion of the second cavity is disposed on one side of the first cavity.

[0037] Thirdly, embodiments of this application also provide a battery device, comprising:

[0038] A housing; a battery cell assembly housed within the housing; a refrigerant heat exchange assembly including a substrate and a refrigerant flow channel structure disposed within the substrate, the substrate being connected to the housing and located on one side of the battery cell assembly, the refrigerant flow channel structure having a partition plate connected to the substrate, the partition plate dividing the refrigerant flow channel structure into a first cavity and a second cavity, the first cavity being configured to contain a first heat exchange medium and supply the first heat exchange medium to flow for heat exchange with the battery cell assembly, and the second cavity being configured to contain a second heat exchange medium and supply the second heat exchange medium to flow for heat exchange with the first cavity.

[0039] In this embodiment, a second heat exchange medium is provided in the second cavity to adjust the temperature distribution of the first heat exchange medium. At this time, the second cavity and the second heat exchange medium can not only perform temperature equalization treatment on the first heat exchange medium in the first cavity, but also absorb and consume collision energy.

[0040] Fourthly, embodiments of this application provide an electrical device, including a battery device provided in some embodiments of the first aspect, a refrigerant heat exchange component provided in some embodiments of the second aspect, or a battery device provided in some embodiments of the third aspect.

[0041] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0042] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0043] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0044] Figure 2 Schematic diagram of the exploded structure of the battery device provided in some embodiments of this application Figure 1 ;

[0045] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0046] Figure 4 Schematic diagram of the exploded structure of the battery device provided in some embodiments of this application Figure 2 ;

[0047] Figure 5 A perspective view of a refrigerant heat exchange assembly provided in some embodiments of this application;

[0048] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle;

[0049] Figure 7 Schematic cross-section of a refrigerant heat exchange assembly provided in some embodiments of this application Figure 1 ;

[0050] Figure 8 Schematic cross-section of a refrigerant heat exchange assembly provided in some embodiments of this application Figure 2 .

[0051] The markings in the diagram mean:

[0052] 1000, vehicles;

[0053] 100. Battery device;

[0054] 10. Box; 11. First box; 12. Second box;

[0055] 20. Battery cell assembly; 21. Battery cell; 211. Housing; 212. End cap; 213. Electrode assembly; 214. Electrode terminal;

[0056] 30. Refrigerant heat exchange assembly; 31. Matrix; 311. First part; 312. Second part; 32. Refrigerant flow channel structure; 321. First cavity; 3211. First sub-cavity; 322. Second cavity; 3221. Second sub-cavity; 33. Partition plate; 34. First plate; 35. Second plate;

[0057] 200. Motor;

[0058] 300. Controller;

[0059] X: Length direction of the battery device; Y: Width direction of the battery device; Z: Height direction of the battery device. Detailed Implementation

[0060] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0062] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0063] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0065] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0066] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0067] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0068] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0069] Because battery cells typically generate heat during charge and discharge cycles, which can easily raise the temperature of the environment in which the battery cells are located, and the charge and discharge efficiency of battery cells will decrease at higher ambient temperatures, current battery devices usually incorporate refrigerant heat exchange components, such as cold plates, to control the temperature of the battery cells and their surrounding environment.

[0070] Refrigerant heat exchange components are usually located at the bottom of the battery pack to cover each battery cell and reduce interference with the various electrical connection structures on the upper part of the battery cells. The battery pack is usually installed at the bottom of the vehicle. During vehicle operation, stones and other debris on the road can easily collide with the bottom of the battery pack, and bumpy roads may also cause the vehicle to scrape the bottom, resulting in impact to the bottom of the battery pack. In other words, the refrigerant heat exchange components are at high risk of collision.

[0071] Because refrigerant heat exchange components are mainly used to control the temperature of individual battery cells, their strength is usually limited. When subjected to impact, the refrigerant heat exchange components are prone to deformation. This deformation can affect the normal flow of the heat exchange medium inside, thus negatively impacting the temperature control of the battery device and its normal operation. In the event of a severe impact, the refrigerant heat exchange components may even break, leading to the loss of the heat exchange medium, and in this case, the refrigerant heat exchange components may even fail.

[0072] Based on the above considerations, in order to alleviate the problem that the refrigerant heat exchange component may be easily deformed and have a negative impact on the normal operation of the battery device, this application provides a battery device in which a partition plate is provided in the substrate of the refrigerant heat exchange component to divide the refrigerant flow channel structure into a first cavity and a second cavity, such that the first cavity contains a first heat exchange medium, and the second cavity is located on the side of the first cavity away from the battery cell.

[0073] In this battery device, the first heat exchange medium in the first cavity can exchange heat with the battery cells to control the temperature of the battery cells; the second cavity is located on the side of the first cavity away from the battery cells, that is, on the side of the first cavity facing outwards from the battery device, so as to protect the first cavity through the second cavity; in the event of a collision, the part of the substrate corresponding to the second cavity can deform first and absorb the collision energy, so as to reduce the collision energy transmitted to the part of the substrate corresponding to the first cavity, thereby reducing the interference of the collision on the flow of the first heat exchange medium, improving the stability of the refrigerant heat exchange component, and reducing the negative impact of the collision on the battery device.

[0074] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0075] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0076] refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle 1000, and the battery can be located at the bottom, front, or rear of the vehicle 1000. The battery can be used to power the vehicle 1000; for example, the battery can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery to supply power to the motor 200, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0077] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0078] refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application.

[0079] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 may include multiple battery cells 21, which are connected in series, parallel, or mixed connection via a busbar.

[0080] In some embodiments, the battery cell assembly 20 is typically formed by arranging a plurality of battery cells 21.

[0081] As an example, the battery cell assembly 20 can be a battery module, which is formed by arranging and fixing multiple battery cells 21 together. As an example, the battery module can be formed by bundling multiple battery cells 21 together with cable ties.

[0082] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies 20, the battery cell assemblies 20 being housed within the housing 10.

[0083] As an example, the battery cell assembly 20 can be a battery module, which can be housed in the housing 10 by fixing the battery module in the housing 10.

[0084] As an example, the battery cell assembly 20 can also be housed in the housing 10 by directly fixing multiple battery cells 21 to the housing 10.

[0085] As an example, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly 20. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 11 may be a top cover or a bottom plate.

[0086] As an example, the housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 10 forms an enclosed space to house the battery cell assembly 20.

[0087] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0088] refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 21 provided in some embodiments of this application. A battery cell 21 refers to the smallest unit that makes up a battery. The battery cell 21 can be a rechargeable battery, meaning that after the battery cell 21 has been discharged, its active materials can be activated by charging and it can continue to be used.

[0089] The battery cell 21 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0090] As shown in the figure, the battery cell 21 includes an end cap 212, a housing 211, an electrode assembly 213, and other functional components.

[0091] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, giving battery cell 21 higher structural strength and improved safety performance. Functional components such as electrode terminals 214 can be provided on end cap 212. Electrode terminals 214 can be used for electrical connection with electrode assembly 213 to output or input electrical energy to battery cell 21. In some embodiments, end cap 212 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 21 reaches a threshold. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 212. The insulating element can be used to isolate the electrical connection components within the housing 211 from the end cap 212 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0092] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 21. This internal environment can accommodate the electrode assembly 213, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. An opening can be provided on the housing 211, and the end cap 212 can be used to close the opening to form the internal environment of the battery cell 21. Alternatively, the end cap 212 and the housing 211 can be integrated. Specifically, the end cap 212 and the housing 211 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 211, the end cap 212 closes the housing 211. The housing 211 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 213. The shell 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0093] Electrode assembly 213 is the component in the battery cell 21 where electrochemical reactions occur. The casing 211 may contain one or more electrode assemblies 213. The electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 213, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 214 to form a current loop.

[0094] Firstly, reference Figures 4 to 6 This application provides a battery device 100 in some embodiments, including a housing 10, a battery cell assembly 20, and a refrigerant heat exchange assembly 30. The battery cell assembly 20 is housed within the housing 10. The refrigerant heat exchange assembly 30 includes a base 31 and a refrigerant flow channel structure 32 disposed within the base 31. The base 31 is connected to the housing 10 and located on one side of the battery cell assembly 20. The refrigerant flow channel structure 32 has a partition plate 33 connected to the base 31, which divides the refrigerant flow channel structure 32 into a first cavity 321 and a second cavity 322. The first cavity 321 is configured to contain and allow flow of a first heat exchange medium for heat exchange with the battery cell assembly 20. At least a portion of the second cavity 322 is located on the side of the first cavity 321 opposite to the battery cell assembly 20.

[0095] The housing 10 refers to the structure in the battery device 100 that provides a fixed foundation for the battery cell 21, controller 300 and other structures; the housing 10 can be cuboid, cylindrical or other shapes.

[0096] A battery cell assembly 20 refers to a structure in a battery device 100 used to provide voltage and capacity. The battery device 100 may include one or more battery cell assemblies 20. A battery cell assembly 20 may include one or more battery cells 21, wherein a battery cell 21 refers to the smallest unit that makes up the battery device 100. When there are multiple battery cells 21, the multiple battery cells 21 may be connected in series, in parallel or in a mixed manner.

[0097] The refrigerant heat exchange assembly 30 is a structure in the battery device 100 used for heat exchange with the battery cells 21. The number of refrigerant heat exchange assemblies 30 can be one, two or more. When there are multiple battery cells 21, the number of refrigerant heat exchange assemblies 30 can be one, and the refrigerant heat exchange assembly 30 exchanges heat with each battery cell 21 to control the temperature of each battery cell 21. When there are multiple battery cells 21, the number of refrigerant heat exchange assemblies 30 can also be two or more, in which case one refrigerant heat exchange assembly 30 can exchange heat with one or more battery cells 21 in the same row or column.

[0098] The substrate 31 refers to the structure in the refrigerant heat exchange assembly 30 used to provide a foundation for the refrigerant flow channel structure 32 or other structures. The substrate 31 can be a bent strip structure, a plate structure, or a structure of other shapes. The substrate 31 can be located inside the housing 10 to facilitate direct heat exchange with the battery cells 21, or it can be located outside the housing 10 to facilitate indirect heat exchange with the battery cells 21 through the connected walls of the housing 10. The substrate 31 is connected to the housing 10 by welding, bonding, screwing, or other means. The substrate 31 is located on one side of the battery cell assembly 20 to facilitate heat exchange between the substrate 31 and each battery cell 21 of the corresponding battery cell assembly 20. The substrate 31 can be located below or above the battery cell assembly 20 along the height direction Z of the battery cell 21 assembly, or it can be located at other positions in the battery cell assembly 20. The material of the substrate 31 can include metal, plastic, or other materials.

[0099] The refrigerant flow channel structure 32 refers to the channel structure provided within the substrate 31 for the flow of the first heat exchange medium. The refrigerant flow channel structure 32 can be a channel structure opened within the substrate 31, or it can be a structure such as a pipe embedded in the substrate. The refrigerant flow channel structure 32 can also make the substrate 31 include different structures, and the channel structure is formed by these different structures. On the cross section perpendicular to the flow direction of the first heat exchange medium within the refrigerant flow channel structure 32, the cross-sectional shape of the refrigerant flow channel structure 32 can be square, circular, or other shapes. Only one refrigerant flow channel structure 32 can be provided within a substrate 31, or multiple refrigerant flow channel structures 32 can be provided.

[0100] For example, the base 31 can be a bent pipe, in which case the refrigerant flow channel structure 32 is the flow channel inside the pipe, and the first heat exchange medium can flow in the flow channel of the base 31; for example, the base 31 can include two interconnected plates, in which case a groove can be provided on one plate and the other plate can be covered by the groove to form the refrigerant flow channel structure 32; it is understood that the refrigerant flow channel structure 32 can also be formed in other ways, and is not limited to the two mentioned above.

[0101] The partition plate 33 refers to the plate structure installed in the refrigerant flow channel structure 32. The partition plate 33 can be a flat plate or a curved plate structure. The material of the partition plate 33 can include metal, plastic or other materials.

[0102] The partition plate 33 is connected to the base 31. The partition plate 33 can be connected to the base 31 by welding, bonding or other means. The partition plate 33 can also be integrally formed with the base 31. The partition plate 33 can divide the refrigerant flow channel structure 32 into a first cavity 321 and a second cavity 322. The first cavity 321 and the second cavity 322 are not connected to each other. The extension direction of the partition plate 33 is the same as or approximately the same as the extension direction of the refrigerant flow channel structure 32, so as to facilitate the flow of the first heat exchange medium and facilitate the heat exchange between the first heat exchange medium and the battery cell 21.

[0103] For example, the opposite sides of the partition plate 33 are respectively connected to the inner surface of the refrigerant flow channel structure 32 to connect to the base 31. At this time, the partition plate 33 and part of the base 31 can form a first cavity 321, and the other part of the partition plate 33 and the base 31 can form a second cavity 322.

[0104] The first cavity 321 is used to contain the first heat exchange medium, so that the first heat exchange medium can flow in the first cavity 321 and exchange heat with the battery cell assembly 20 corresponding to the refrigerant heat exchange component 30. That is, the first cavity 321 can be a long channel structure, so that the extension direction of the first cavity 321 is the same as or approximately the same as the extension direction of the refrigerant flow channel structure 32, so that the first heat exchange medium can exchange heat with the battery cell assembly 20 corresponding to the refrigerant heat exchange component 30 when flowing in the first cavity 321.

[0105] The first heat exchange medium refers to the medium used for heat exchange between the battery cells 21 in the refrigerant heat exchange component 30. The first heat exchange medium may include liquid medium, gaseous medium, solid-liquid mixture medium, etc.; the first heat exchange medium may include refrigerant, for example, the first heat exchange medium may include tetrafluoroethane, difluoromethane, pentafluoroethane, etc.

[0106] The second cavity 322 is used to protect the first cavity 321. The second cavity 322 can be empty or filled with energy-absorbing material to absorb collision energy, thereby protecting the first cavity 321 and the corresponding part of the substrate 31.

[0107] At least a portion of the second cavity 322 is located on the side of the first cavity 321 away from the battery cell assembly 20. That is, only a portion of the second cavity 322 can be located on the side of the first cavity 321 away from the battery cell assembly 20, or the entire second cavity 322 can be located on the side of the first cavity 321 away from the battery cell assembly 20.

[0108] The first cavity 321 is located on the side away from the battery cell 21, that is, the side of the first cavity 321 facing away from the housing 10. In the event of a collision with the battery device 100, this arrangement allows the second cavity 322 and the corresponding parts of the base 31 to be impacted first and bear the impact energy. At this time, the second cavity 322 and the corresponding parts of the base 31 can deform and absorb part of the impact energy, thereby reducing the impact energy borne by the partition plate 33 and the corresponding parts of the base 31 in the first cavity 321, reducing the risk of deformation of the partition plate 33 and the corresponding parts of the base 31 in the first cavity 321, and thus reducing the negative impact that the collision may have on the flow of the first heat exchange medium in the first cavity 321.

[0109] When the battery device 100 is subjected to an external impact, the substrate 31 is at risk of deformation after the impact. The deformed substrate 31 may reduce the local flow area of ​​the first cavity 321, or even cause the first cavity 321 to be partially blocked. It may also cause the substrate 31 to break and cause the first heat exchange medium to be lost, thereby weakening or failing the heat exchange performance of the refrigerant heat exchange component 30 at the deformed part of the substrate 31.

[0110] Accordingly, in this embodiment, a partition plate 33 is provided in the refrigerant flow channel structure 32 of the refrigerant heat exchange assembly 30 to divide the refrigerant flow channel structure 32 into a first cavity 321 and a second cavity 322. The first cavity 321 is used to supply the flow of the first heat exchange medium to control the temperature of the battery cell 21. The second cavity 322 is located on the side of the first cavity 321 away from the battery cell 21 so that the energy generated by the collision can be absorbed through the second cavity 322, thereby reducing the interference of the collision on the flow of the first heat exchange medium, reducing the deformation risk of the partition plate 33 and the parts of the substrate 31 corresponding to the first cavity 321, improving the stability of the refrigerant heat exchange assembly 30, and reducing the negative impact of the collision on the battery device 100.

[0111] In some embodiments, the strength of the portion of the substrate 31 corresponding to the first cavity 321 is greater than the strength of the portion of the substrate 31 corresponding to the second cavity 322.

[0112] The part of the substrate 31 corresponding to the first cavity 321 refers to the part of the substrate 31 that together with the partition plate 33 forms the first cavity 321. The part of the substrate 31 corresponding to the second cavity 322 refers to the part of the substrate 31 that together with the partition plate 33 forms the second cavity 322.

[0113] The strength of the portion of the substrate 31 corresponding to the first cavity 321 is greater than the strength of the portion of the substrate 31 corresponding to the second cavity 322, which can be achieved in various ways. For example, reinforcing structures of different strengths can be provided on the portions of the substrate 31 corresponding to the first cavity 321 and the portions corresponding to the second cavity 322, respectively, to make their strengths different. Alternatively, the thicknesses of the portions of the substrate 31 corresponding to the first cavity 321 and the portions corresponding to the second cavity 322 can be different to make their strengths different. Or, the materials of the portions of the substrate 31 corresponding to the first cavity 321 and the portions corresponding to the second cavity 322 can be different to make their strengths different; in this case, the substrate 31 can include two or more structures of different materials connected together. It is understood that other methods can be used to make the strengths of the portions of the substrate 31 corresponding to the first cavity 321 and the portions corresponding to the second cavity 322 different, and are not limited to the above-mentioned cases.

[0114] Since the second cavity 322 is mainly used to absorb the collision energy generated by the collision of the battery device 100, the strength of the part of the base 31 corresponding to the first cavity 321 is greater than the strength of the part of the base 31 corresponding to the second cavity 322. When the battery device 100 is subjected to a collision, this arrangement makes the part of the base 31 corresponding to the second cavity 322 more prone to deformation than the part of the base 31 corresponding to the first cavity 321, so as to absorb the collision energy through deformation. This reduces the energy transferred to the part of the base 31 corresponding to the first cavity 321 and reduces the energy transferred to the partition plate 33, thereby reducing the interference of the collision on the flow of the first heat exchange medium and improving the stability of the refrigerant heat exchange assembly 30.

[0115] In this embodiment, the strength of the portion of the substrate 31 corresponding to the first cavity 321 is greater than the strength of the portion of the substrate 31 corresponding to the second cavity 322. When the refrigerant heat exchange assembly 30 is impacted, this arrangement allows the portion of the substrate 31 located in the second cavity 322 to deform first and absorb and dissipate the impact energy through deformation. This reduces the impact energy transmitted to the portion of the substrate 31 located in the first cavity 321, reduces the risk of deformation of the portion of the substrate 31 located in the first cavity 321, and reduces the interference caused by the impact on the flow of the first heat exchange medium.

[0116] refer to Figures 5 to 7 In some embodiments, a first plate 34 connected to the base 31 and / or the partition plate 33 is provided in the first cavity 321, and a second plate 35 connected to the base 31 and / or the partition plate 33 is provided in the second cavity 322; on the projection plane perpendicular to the length direction of the refrigerant flow channel structure 32, the sum of the orthographic projection areas of the first plate 34 is greater than the sum of the orthographic projection areas of the second plate 35.

[0117] The first plate 34 refers to the plate structure disposed in the first cavity 321. The shape of the first plate 34 can be square, trapezoidal, triangular or other shapes. The number of first plates 34 can be one, two or more. The material of the first plate 34 can include metal, plastic or other materials.

[0118] The first plate 34 is located inside the first cavity 321. The first plate 34 can be connected to one of the inner surfaces of the first cavity 321, or it can be connected to two or more inner surfaces of the first cavity 321. Since the first cavity 321 is a part of the base 31 and the partition plate 33, the first plate 34 can be connected only to the base 31 or the partition plate 33, or different positions of the first plate 34 can be connected to the base 31 and the partition plate 33 respectively. The first plate 34 can be connected to the base 31 and / or the partition plate 33 by welding, bonding or other means. The first plate 34 can be integrally formed with the base 31 and / or the partition plate 33.

[0119] The first plate 34 is configured to provide support to the connected base 31 and / or partition plate 33, and can improve the strength of the partition plate 33 and / or base 31 corresponding to the first cavity 321 by dispersing part of the collision energy.

[0120] The second plate 35 refers to the plate structure disposed in the second cavity 322. The shape of the second plate 35 can be square, trapezoidal, triangular or other shapes. The number of second plates 35 can be one, two or more. The material of the second plate 35 can include metal, plastic or other materials.

[0121] The second plate 35 is located inside the second cavity 322. The second plate 35 can be connected to one of the inner surfaces of the second cavity 322, or it can be connected to two or more inner surfaces of the second cavity 322. Since the second cavity 322 is a part of the base 31 and the partition plate 33, the second plate 35 can be connected only to the base 31 or the partition plate 33, or different positions of the second plate 35 can be connected to the base 31 and the partition plate 33 respectively. The second plate 35 can be connected to the base 31 and / or the partition plate 33 by welding, bonding or other means. The second plate 35 can be integrally formed with the base 31 and / or the partition plate 33.

[0122] The second plate 35 is configured to provide support for the connected base 31 and / or partition plate 33, and can improve the strength of the partition plate 33 and / or base 31 corresponding to the second cavity 322 by dispersing part of the collision energy.

[0123] The area of ​​the projection plane of the first plate 34 perpendicular to the length direction of the refrigerant flow channel structure 32 reflects the degree to which the first plate 34 can improve the strength of the connected base 31 and / or partition plate 33. The larger the area of ​​the first plate 34 in this projection plane, the higher the strength that the first plate 34 can improve. Similarly, the area of ​​the second plate 35 in this projection plane reflects the degree to which the second plate 35 can improve the strength of the connected base 31 and / or partition plate 33. The larger the area of ​​the second plate 35 in this projection plane, the higher the strength that the second plate 35 can improve.

[0124] When there is only one first plate 34, the sum of the projected areas of the first plate 34 on the projection surface is the area of ​​the first plate 34 on the projection surface; when there are two or more first plates 34, the sum of the projected areas of the first plates 34 on the projection surface is the sum of the areas of each first plate 34 on the projection surface.

[0125] When there is only one second plate 35, the sum of the projected areas of the second plate 35 on the projection surface is the area of ​​the second plate 35 on the projection surface; when there are two or more second plates 35, the sum of the projected areas of the second plates 35 on the projection surface is the sum of the areas of each second plate 35 on the projection surface.

[0126] The sum of the projected areas of the first plate 34 on the projection plane is greater than the sum of the projected areas of the second plate 35 on the projection plane, so that the strength of the portion of the base 31 corresponding to the first cavity 321 is greater than the strength of the portion of the base 31 corresponding to the second cavity 322. The projected area of ​​the first plate 34 on the projection plane can be greater than the projected area of ​​the second plate 35 on the projection plane in various ways; for example, the number of first plates 34 can be greater than the number of second plates 35; for example, the thickness of the first plate 34 can be greater than the thickness of the second plate 35; it is understood that other methods can also be used to make the projected area of ​​the first plate 34 on the projection plane greater than the projected area of ​​the second plate 35 on the projection plane, and these methods are not limited to the two mentioned above.

[0127] In this embodiment, a first plate 34 and a second plate 35 are respectively provided in the first cavity 321 and the second cavity 322 to improve the strength of the substrate 31. At the same time, the orthographic projection area of ​​the first plate 34 is made larger than the orthographic projection area of ​​the second plate 35 so that the strength of the first plate 34 is greater than the strength of the second plate 35. This allows the substrate 31 to deform first at the second cavity 322 and absorb and dissipate collision energy, reducing the collision energy transmitted to the part of the substrate 31 located in the first cavity 321.

[0128] refer to Figures 5 to 7In some embodiments, the number of first plates 34 is greater than the number of second plates 35.

[0129] When the number of first plates 34 is greater than the number of second plates 35, the number of first plates 34 can be two, three or more, and the number of second plates 35 can be one, two or more. When the number of first plates 34 is greater than the number of second plates 35, on the projection plane perpendicular to the extension direction of the refrigerant flow channel structure 32, the sum of the areas of the orthographic projections of each first plate 34 is greater than the sum of the areas of the orthographic projections of each second plate 35.

[0130] Because the first plate 34 is used to improve the strength of the partition plate 33 and the part of the base 31 corresponding to the first cavity 321, and the second plate 35 is used to improve the strength of the partition plate 33 and the part of the base 31 corresponding to the second cavity 322; therefore, the number of first plates 34 is greater than the number of second plates 35, so that the strength of the part of the base 31 corresponding to the first cavity 321 can be greater than the strength of the part of the base 31 corresponding to the second cavity 322, thereby allowing the base 31 to deform first at the second cavity 322 and absorb and dissipate collision energy.

[0131] In this embodiment, the number of first plates 34 is greater than the number of second plates 35, so that the sum of the strengths of each first plate 34 is greater than the sum of the strengths of each second plate 35, thereby making the strength of the substrate 31 at the first cavity 321 greater than the strength of the substrate 31 at the second cavity 322. When the refrigerant heat exchange assembly 30 is impacted, this arrangement enables the substrate 31 to deform first at the second cavity 322 and absorb and dissipate the impact energy, thereby reducing the impact energy transmitted to the part of the substrate 31 located at the first cavity 321.

[0132] refer to Figures 5 to 8 In some embodiments, the thickness of the first plate 34 is greater than the thickness of the second plate 35.

[0133] On the projection plane perpendicular to the extension direction of the refrigerant flow channel structure 32, the thickness of the first plate 34 refers to the dimension of the shorter side in the orthographic projection of the first plate 34, as referenced. Figure 8 The dimension shown in the figure as W1 is the thickness of the first plate 34. The thickness of the first plate 34 reflects its strength. The greater the thickness of the first plate 34, the stronger the first plate 34 is.

[0134] On the projection plane perpendicular to the extension direction of the refrigerant flow channel structure 32, the thickness of the second plate 35 refers to the dimension of the shorter side in the orthographic projection of the second plate 35, as shown in the reference diagram. Figure 8The dimension shown in the figure as W2 is the thickness of the second plate 35; the thickness of the second plate 35 reflects the strength of the second plate 35, and the greater the thickness of the second plate 35, the stronger the second plate 35 is.

[0135] The thickness of the first plate 34 is greater than the thickness of the second plate 35, which makes the projected area of ​​the first plate 34 greater than the projected area of ​​the second plate 35. It also makes the strength of the part of the base 31 corresponding to the first cavity 321 greater than the strength of the part of the base 31 corresponding to the second cavity 322. This allows the base 31 to deform first at the second cavity 322 and absorb and dissipate collision energy.

[0136] In this embodiment, the thickness of the first plate 34 is greater than the thickness of the second plate 35, so that the strength of the first plate 34 is greater than the strength of the second plate 35, thereby making the strength of the substrate 31 at the first cavity 321 greater than the strength of the substrate 31 at the second cavity 322. When the refrigerant heat exchange assembly 30 is impacted, this arrangement enables the substrate 31 to deform first at the second cavity 322 and absorb and dissipate the impact energy, thereby reducing the impact energy transmitted to the part of the substrate 31 located at the first cavity 321.

[0137] refer to Figures 5 to 8 In some embodiments, one side of the first plate 34 is connected to the partition plate 33, and the other side of the first plate 34 is connected to the base 31 to divide the first cavity 321 into at least two first sub-cavities 3211; and / or, one side of the second plate 35 is connected to the partition plate 33, and the other side of the second plate 35 is connected to the base 31 to divide the second cavity 322 into at least two second sub-cavities 3221.

[0138] One side of the first plate 34 is connected to the partition plate 33 and the other side is connected to the base 31. At this time, the first plate 34 can divide the first cavity 321 into at least two first sub-cavities 3211. Depending on the number of first plates 34, the number of first sub-cavities 3211 can be two, three or more.

[0139] When the refrigerant heat exchange component 30 is located below the battery cell component 20 along the height direction Z of the battery device 100, the two sides of the first plate 34 can be connected to the partition plate 33 and the base 31 respectively along the arrangement direction of the first cavity 321 and the second cavity 322. At this time, the first plate 34 can be a plate structure parallel to the height direction Z of the battery device 100.

[0140] Understandably, other plates can also be installed inside the first cavity 321, such as plates perpendicular to the height direction Z of the battery device 100, to further strengthen the strength of the parts corresponding to the first cavity 321.

[0141] When the first cavity 321 is divided into at least two first sub-cavities 3211 by the first plate 34, the first heat exchange medium can flow in each first sub-cavity 3211, or the first heat exchange medium can flow only in a portion of the first sub-cavities 3211, or a valve can be installed in each first sub-cavity 3211, and the on / off state of each first sub-cavity 3211 can be controlled according to the temperature control requirements, thereby controlling the heat exchange effect of the refrigerant heat exchange assembly 30.

[0142] One side of the second plate 35 is connected to the partition plate 33 and the other side is connected to the base 31. At this time, the second plate 35 can divide the second cavity 322 into at least two second sub-cavities 3221. Depending on the number of second plates 35, the number of second sub-cavities 3221 can be two, three or more.

[0143] When the refrigerant heat exchange component 30 is located below the battery cell component 20 along the height direction Z of the battery device 100, the two sides of the second plate 35 can be connected to the partition plate 33 and the base 31 respectively along the arrangement direction of the second cavity 322 and the second cavity 322. At this time, the second plate 35 can be a plate structure parallel to the height direction Z of the battery device 100.

[0144] Understandably, other plates can also be installed inside the second cavity 322, such as plates perpendicular to the height direction Z of the battery device 100, to further strengthen the strength of the parts corresponding to the second cavity 322.

[0145] Since the second cavity 322 is located on the side of the first cavity 321 away from the battery cell 21, and the second cavity 322 is used to receive collisions before the first cavity 321, the direction in which the collision energy generated by the external collision is transferred to the base 31 should be perpendicular or approximately perpendicular to the arrangement direction of the second cavity 322 and the first cavity 321. Accordingly, the first plate 34 and the second plate 35 are connected to the base 31 and the partition plate 33 at their respective ends along the arrangement direction of the first cavity 321 and the second cavity 322, so that the first plate 34 and the second plate 35 can better support the base 31.

[0146] In this embodiment, the first plate 34 and the second plate 35 are connected to the base 31 and the partition plate 33 on both sides, so that the first plate 34 and the second plate 35 can better support the base 31. At the same time, this arrangement can also divide the first cavity 321 into multiple first sub-cavities 3211, so as to control the flow and state of the first heat exchange medium in the first cavity 321.

[0147] refer to Figures 5 to 8In some embodiments, in the arrangement direction of the first cavity 321 and the second cavity 322, the size of the first cavity 321 is smaller than the size of the second cavity 322.

[0148] The dimension of the first cavity 321 in the arrangement direction of the first cavity 321 and the second cavity 322 is the height of the first cavity 321, and also the distance between the two inner walls of the first cavity 321 in the arrangement direction of the first cavity 321 and the second cavity 322. (Refer to...) Figure 8 The dimension shown in H1 in the figure is the dimension of the first cavity 321 in the arrangement direction of the first cavity 321 and the second cavity 322. This dimension reflects the strength of the part of the substrate 31 corresponding to the first cavity 321. The larger the dimension, the larger the volume of the first cavity 321. The lower the ratio of the volume of the part of the first plate 34, the substrate 31 and the part of the first cavity 321 to the volume of the first cavity 321, the lower the strength of the part of the first plate 34, the substrate 31 and the part of the first cavity 321.

[0149] The dimension of the second cavity 322 in the arrangement direction of the second cavity 322 is the height of the second cavity 322, and also the distance between the two inner walls of the second cavity 322 in the arrangement direction of the second cavity 322. (Refer to...) Figure 8 The dimension shown in H1 in the figure is the dimension of the second cavity 322 in the arrangement direction of the second cavity 322. This dimension reflects the strength of the part of the base 31 corresponding to the second cavity 322. The larger the dimension, the larger the volume of the second cavity 322. The lower the ratio of the volume of the part of the second plate 35, the base 31 and the part of the second cavity 322 to the volume of the second cavity 322, the lower the strength of the part of the second plate 35, the base 31 and the part of the second cavity 322.

[0150] The height of the first cavity 321 is less than the height of the second cavity 322, so that the strength of the part of the base 31 corresponding to the first cavity 321 is greater than the strength of the part of the base 31 corresponding to the second cavity 322, thereby enabling the base 31 to deform first at the second cavity 322 and absorb and dissipate collision energy.

[0151] In this embodiment, the height of the first cavity 321 is less than the height of the second cavity 322, so that the volume of the first cavity 321 is less than the volume of the second cavity 322. This allows the strength of the substrate 31 at the second cavity 322 to be lower than the strength of the substrate 31 at the first cavity 321. In the event of a collision with the refrigerant heat exchange assembly 30, this arrangement allows the substrate 31 to have a larger deformation space at the second cavity 322, thereby allowing the substrate 31 to have a larger deformation and absorb more collision energy at the second cavity 322.

[0152] refer to Figures 5 to 8 In some embodiments, the substrate 31 includes a first part 311 and a second part 312 connected to the first part 311. The first part 311 and the partition plate 33 form a first cavity 321, and the second part 312 and the partition plate 33 form a second cavity 322. The thickness of the first part 311 is greater than the thickness of the second part 312.

[0153] The first part 311 refers to the part corresponding to the first cavity 321 in the substrate 31. The first part 311 can form the first cavity 321 with the partition plate 33. The material of the first part 311 may include metal, plastic or other materials.

[0154] The second part 312 refers to the part corresponding to the second cavity 322 in the substrate 31. The second part 312 can form the second cavity 322 with the partition plate 33. The material of the second part 312 may include metal, plastic or other materials.

[0155] The second part 312 is connected to the first part 311. The second part 312 can be connected to the first part 311 by welding, bonding or other means. The second part 312 can also be integrally formed with the first part 311. The base 31 may include only the first part 311 and the second part 312, or it may include other structures besides the first part 311 and the second part 312.

[0156] In the event of a collision with the battery device 100, both the first part 311 and the second part 312 are at risk of deformation. Deformation of the first part 311 will affect the flow state of the first heat exchange medium within the first cavity 321; for example, deformation of the first part 311 may cause the flow area of ​​the first heat exchange medium at the deformation location of the first part 311 to decrease, or may even cause blockage of the first cavity 321 at the deformation location of the first part 311; or, for example, deformation of the first part 311 may also cause damage, resulting in the loss of the first heat exchange medium.

[0157] The thickness of the first part 311 refers to the dimension of the first part 311 in the direction perpendicular to the flow direction of the first heat exchange medium, as shown in the reference. Figure 8 The dimension shown in T1 in the figure is the thickness of the first part 311. The thickness of the first part 311 reflects its strength. The greater the thickness of the first part 311, the higher its strength.

[0158] The thickness of the second part 312 refers to the dimension of the second part 312 in the direction perpendicular to the flow direction of the second heat exchange medium, see reference. Figure 8 The dimension shown in T2 in the figure is the thickness of the second part 312. The thickness of the second part 312 reflects its strength. The greater the thickness of the second part 312, the higher its strength.

[0159] The thickness of the first part 311 is greater than that of the second part 312, so that the strength of the first part 311 is greater than that of the second part 312. In the event of a collision with the battery device 100, this arrangement allows the second part 312 to deform more easily than the first part 311, and allows the second part 312 to deform before the first part 311. This allows the second part 312 to absorb the collision energy through deformation, thereby reducing the energy transferred to the first part 311 and the energy transferred to the partition plate 33, thereby reducing the interference caused by the collision to the flow of the first heat exchange medium and improving the stability of the refrigerant heat exchange assembly 30.

[0160] In this embodiment, the thickness of the first part 311 of the substrate 31 is greater than the thickness of the second part 312, so that the strength of the first part 311 is greater than the strength of the second part 312. When the refrigerant heat exchange assembly 30 is impacted, this arrangement enables the second part 312 to deform first and absorb and dissipate the impact energy, thereby reducing the impact energy transmitted to the first part 311.

[0161] In some embodiments, the second cavity 322 contains a second heat exchange medium, which is configured to flow within the second cavity 322.

[0162] The second heat exchange medium refers to the medium that can exchange heat with the partition plate 33 and the first heat exchange medium. The second heat exchange medium may include liquid medium, gaseous medium, solid-liquid mixture, etc. The material of the second heat exchange medium may include refrigerant, for example, the second heat exchange medium may include tetrafluoroethane, difluoromethane, pentafluoroethane, etc. The material of the second heat exchange medium may also include coolant, for example, the second heat exchange medium may include water, ethylene glycol aqueous solution, etc.

[0163] The second heat exchange medium can flow within the second cavity 322 to transport and regulate heat. At the higher-temperature portion of the first cavity 321, the second heat exchange medium in the second cavity 322 exchanges more heat with the corresponding partition plate 33 and the first heat exchange medium, resulting in a larger temperature drop at that location in the first cavity 321. At this point, the second heat exchange medium carries a higher amount of heat. Subsequently, the second heat exchange medium flows to the location in the second cavity 322 corresponding to the lower-temperature portion of the first cavity 321. The second heat exchange medium releases heat to the corresponding partition plate 33 and the first heat exchange medium, causing the temperature of that location in the first cavity 321 to rise. The first heat exchange medium and the partition plate 33 can also transfer less heat to the second heat exchange medium, resulting in a smaller temperature rise or drop at the corresponding location in the first cavity 321. This reduces the temperature difference between different parts of the first cavity 321, allowing the refrigerant heat exchange assembly 30 to more uniformly control the temperature of the corresponding battery cell assembly 20 and reduce temperature differences between different locations within the corresponding battery cell assembly 20.

[0164] In this embodiment, a second heat exchange medium is provided in the second cavity 322 to adjust the temperature distribution of the first heat exchange medium. At this time, the second cavity 322 and the second heat exchange medium can not only absorb and consume collision energy, but also perform temperature equalization treatment on the first heat exchange medium in the first cavity 321.

[0165] In some embodiments, the second cavity 322 is a closed space structure, and the second heat exchange medium is a phase change material.

[0166] The second cavity 322 is a closed space structure, meaning that the second heat exchange medium can flow inside the second cavity 322, but it is difficult to flow outside the second cavity 322.

[0167] A phase change material (PCM) is a material capable of changing from one physical state to another to absorb or release heat. During the physical state transition of a PCM, it can flow autonomously within the second cavity 322. For example, a PCM can change from a liquid to a gaseous state, absorbing heat in the process, or it can change from a gaseous state to a liquid state, releasing heat in the process. The gaseous PCM carrying heat can flow to a lower temperature location and can push the liquid PCM to a higher temperature location.

[0168] The phase change material may include tetrafluoroethane, difluoromethane, pentafluoroethane, etc.

[0169] When the second heat exchange medium is a phase change material, the second heat exchange medium flows autonomously during the phase change process without the need for external driving devices to drive its flow. Therefore, the second cavity 322 can be a closed space structure.

[0170] The following explanation uses the example of a second heat exchange medium capable of transitioning between a liquid and a gaseous state. In the higher-temperature portion of the first cavity 321, the second heat exchange medium in the second cavity 322 can transition from a liquid to a gaseous state, absorbing heat in the process. Subsequently, the gaseous second heat exchange medium flows to a lower-temperature location in the second cavity 322, corresponding to a lower-temperature portion of the first cavity 321. Based on the temperature relationship between the first heat exchange medium in that portion of the first cavity 321 and the corresponding portion of the second heat exchange medium in the second cavity 322, the second heat exchange medium can release heat to the first cavity 321, causing the temperature of that corresponding portion of the first cavity 321 to rise. The first cavity 321 can also transfer heat to the second heat exchange medium, but the amount of heat transferred is relatively small. This results in a smaller temperature rise or fall in the corresponding portion of the first cavity 321, thereby reducing the temperature difference between different portions of the first cavity 321.

[0171] In this embodiment, the second heat exchange medium is a phase change material, and the second cavity 322 is a closed space structure. The phase change material can absorb heat and undergo phase change at a higher temperature, and the phase change material after phase change can flow to a lower temperature position and release heat, thereby achieving the effect of making the temperature distribution of the first heat exchange medium in the first cavity 321 more uniform.

[0172] In some embodiments, the second cavity 322 is a circulating space structure, and the second heat exchange medium is configured to circulate within the second cavity 322.

[0173] A circulating space structure refers to a spatial structure with a certain path that is connected end to end. The circulating space structure can be a strip-shaped spatial structure connected end to end. The second cavity 322 can be a circular ring-shaped spatial structure, a square ring-shaped spatial structure, or a circulating space structure of other shapes. At this time, the second cavity 322 can be a closed circulating space structure. The second cavity 322 can also be connected to other external structures. For example, an external driving device (such as a water pump) can be set outside the second cavity 322, and the second cavity 322 can be connected to the external driving device to drive the second heat exchange medium to flow in the second cavity 322.

[0174] The second heat exchange medium can circulate within the second cavity 322, that is, the second heat exchange medium can circulate within the second cavity 322 in a certain direction. During the flow of the second heat exchange medium, the second heat exchange medium can exchange heat with the first plate 34 to absorb heat from the first cavity 321 or release heat to the first cavity 321.

[0175] The second heat exchange medium can circulate within the second cavity 322 by the force generated by the change in heat. The second heat exchange medium can also be driven by an external drive device (such as a water pump) to circulate within the second cavity 322. In this case, the second heat exchange medium may include a refrigerant, such as tetrafluoroethane, difluoromethane, pentafluoroethane, etc. The second heat exchange medium may also include a coolant, such as water, ethylene glycol aqueous solution, etc.

[0176] In the higher-temperature portion of the first cavity 321, the second heat exchange medium can absorb more heat, causing a greater temperature drop in the corresponding portion of the first cavity 321. In the lower-temperature portion of the first cavity 321, based on the temperature relationship between the second heat exchange medium in that portion of the first cavity 321 and the corresponding portion of the second cavity 322, the second heat exchange medium can absorb a small amount of heat from the first heat exchange medium in the first cavity 321, and can also release heat to the first heat exchange medium in the first cavity 321. This results in a smaller temperature drop or an increase in temperature in the corresponding portion of the first cavity 321, thereby reducing the temperature difference between different portions of the first cavity 321.

[0177] In this embodiment, the second cavity 322 is a circulating space structure, and the second heat exchange medium can circulate within the second cavity 322. During the circulation process, the second heat exchange medium can transport heat from a high temperature area to a low temperature area, thereby achieving the effect of making the temperature distribution of the first heat exchange medium in the first cavity 321 more uniform.

[0178] In some embodiments, the substrate 31 is an integrally formed structural component.

[0179] The base 31 is a one-piece molded structural component to improve the strength and consistency of the base 31, while reducing the assembly difficulty and complexity of the base 31; depending on the material of the base 31, the base 31 can be integrally molded by injection molding, die casting, extrusion or other methods.

[0180] The partition plate 33 can also be integrally formed with the base 31 to further reduce the assembly difficulty and complexity of the refrigerant heat exchange component 30 and improve the strength and consistency of the refrigerant heat exchange component 30.

[0181] In the case where the base 31 includes a first part 311 and a second part 312, the first part 311 and the second part 312 are also integrally formed to improve the sealing performance of the connection between the first part 311 and the second part 312.

[0182] In the case where the refrigerant heat exchange component 30 includes a first plate 34 and a second plate 35, the first plate 34 and the second plate 35 can also be integrally formed with the base 31 to further reduce the assembly difficulty and complexity of the refrigerant heat exchange component 30 and improve the strength and consistency of the refrigerant heat exchange component 30.

[0183] In this embodiment, the base 31 is made into a one-piece molded structural component to reduce the installation difficulty of the base 31, while improving the overall strength and consistency of the base 31.

[0184] In some embodiments, the substrate 31 is a pipe structure.

[0185] The base 31 is a pipe structure. At this time, the refrigerant heat exchange component 30 can be a cold pipe, and the base 31 can be a straight pipe structure, or a curved structure extending along a reference straight line, or a serpentine bend structure.

[0186] When the base 31 is a pipe structure, the base 31 can be connected to the top cover or bottom plate of the box 10. The base 31 can be located inside the box 10 or outside the box 10.

[0187] In this embodiment, the substrate 31 is designed as a pipe structure to simplify its structure and reduce its space occupation.

[0188] In some embodiments, the battery device 100 includes a housing 10, a battery cell assembly 20, and a refrigerant heat exchange assembly 30.

[0189] The housing 10 includes a first housing 11 and a second housing 12, which are interlocked to form a receiving cavity, in which the battery cell assembly 20 is housed; the second housing 12 includes a bottom plate, which is located below the battery cell assembly 20 along the height direction Z of the battery device 100, and the bottom plate is used to support the battery cell assembly 20.

[0190] The refrigerant heat exchange component 30 includes a base 31 and a refrigerant flow channel structure 32 disposed in the base 31. The base 31 is connected to the bottom plate along the height direction Z of the battery device 100 and is a pipe structure.

[0191] The refrigerant flow channel structure 32 is formed within the substrate 31. A partition plate 33 connected to the substrate 31 is provided within the refrigerant flow channel structure 32. The partition plate 33 divides the refrigerant flow channel structure 32 into a first cavity 321 and a second cavity 322 that are not interconnected. The partition plate 33 is parallel to the bottom plate. The second cavity 322 is located below the first cavity 321 along the height direction Z of the battery device 100.

[0192] The first cavity 321 is provided with a plurality of first plates 34, which are parallel to the height direction Z of the battery device 100. The two ends of the first plates 34 along the height direction Z of the battery device 100 are respectively connected to the base 31 and the partition plate 33. A first heat exchange medium flows in the first cavity 321, which is a phase change material.

[0193] The second cavity 322 is provided with a plurality of second plates 35, which are parallel to the height direction Z of the battery device 100. The two ends of the second plates 35 along the height direction Z of the battery device 100 are respectively connected to the base 31 and the partition plate 33. A first heat exchange medium flows in the second cavity 322, which is a phase change material.

[0194] The strength of the part of the substrate 31 corresponding to the first plate 34 is greater than the strength of the part of the substrate 31 corresponding to the second plate 35.

[0195] In some embodiments, the substrate 31 is an integrally extruded structure, and the substrate 31 is bent to form a refrigerant heat exchange component 30.

[0196] The substrate 31 is an integral extrusion structure, that is, the substrate 31 is formed by an integral extrusion process; wherein, the integral extrusion process refers to the process of applying pressure to the raw material and making it pass through the mold to form a shape.

[0197] When the substrate 31 is a pipe structure, the substrate 31 formed by integral extrusion has the advantages of high structural integrity, high strength and excellent sealing performance, smooth inner wall and low internal resistance; at the same time, the substrate 31 formed by integral extrusion also has the advantages of flexible material selection and high production efficiency.

[0198] The substrate 31 is bent to form a refrigerant heat exchange component 30. Depending on the required shape of the refrigerant heat exchange component 30, the substrate 31 can be bent into a U-shape, S-shape, W-shape or other shapes. When the substrate 31 is a pipe structure, the refrigerant heat exchange component 30 can be a bent pipe structure.

[0199] Secondly, embodiments of this application provide a refrigerant heat exchange assembly 30, including a substrate 31 and a refrigerant flow channel structure 32 disposed within the substrate 31. The substrate 31 is connected to a housing 10 and located on one side of a battery cell assembly 20. The refrigerant flow channel structure 32 is provided with a partition plate 33 connected to the substrate 31. The partition plate 33 divides the refrigerant flow channel structure 32 into a first cavity 321 and a second cavity 322. The first cavity 321 is configured to contain a first heat exchange medium and allow the first heat exchange medium to flow so as to exchange heat with the battery cell assembly 20. At least a portion of the second cavity 322 is disposed on the side of the first cavity 321 away from the battery cell assembly 20.

[0200] The refrigerant heat exchange assembly 30 is a structure in the battery device 100 used for heat exchange with the battery cells 21. The number of refrigerant heat exchange assemblies 30 can be one, two or more. When there are multiple battery cells 21, the number of refrigerant heat exchange assemblies 30 can be one, and the refrigerant heat exchange assembly 30 exchanges heat with each battery cell 21 to control the temperature of each battery cell 21. When there are multiple battery cells 21, the number of refrigerant heat exchange assemblies 30 can also be two or more, in which case one refrigerant heat exchange assembly 30 can exchange heat with one or more battery cells 21 in the same row or column.

[0201] The substrate 31 refers to the structure in the refrigerant heat exchange assembly 30 used to provide a foundation for the refrigerant flow channel structure 32 or other structures. The substrate 31 can be a bent strip structure, a plate structure, or a structure of other shapes. The substrate 31 can be located inside the housing 10 to facilitate direct heat exchange with the battery cells 21, or it can be located outside the housing 10 to facilitate indirect heat exchange with the battery cells 21 through the connected walls of the housing 10. The substrate 31 is connected to the housing 10 by welding, bonding, screwing, or other means. The substrate 31 is located on one side of the battery cell assembly 20 to facilitate heat exchange between the substrate 31 and each battery cell 21 of the corresponding battery cell assembly 20. The substrate 31 can be located below or above the battery cell assembly 20 along the height direction Z of the battery cell 21 assembly, or it can be located at other positions in the battery cell assembly 20. The material of the substrate 31 can include metal, plastic, or other materials.

[0202] The refrigerant flow channel structure 32 refers to the channel structure provided within the substrate 31 for the flow of the first heat exchange medium. The refrigerant flow channel structure 32 can be a channel structure opened within the substrate 31, or it can be a structure such as a pipe embedded in the substrate. The refrigerant flow channel structure 32 can also make the substrate 31 include different structures, and the channel structure is formed by these different structures. On the cross section perpendicular to the flow direction of the first heat exchange medium within the refrigerant flow channel structure 32, the cross-sectional shape of the refrigerant flow channel structure 32 can be square, circular, or other shapes. Only one refrigerant flow channel structure 32 can be provided within a substrate 31, or multiple refrigerant flow channel structures 32 can be provided.

[0203] The partition plate 33 refers to the plate structure installed in the refrigerant flow channel structure 32. The partition plate 33 can be a flat plate or a curved plate structure. The material of the partition plate 33 can include metal, plastic or other materials.

[0204] The partition plate 33 is connected to the base 31. The partition plate 33 can be connected to the base 31 by welding, bonding or other means. The partition plate 33 can also be integrally formed with the base 31. The partition plate 33 can divide the refrigerant flow channel structure 32 into a first cavity 321 and a second cavity 322. The first cavity 321 and the second cavity 322 are not connected to each other. The extension direction of the partition plate 33 is the same as or approximately the same as the extension direction of the refrigerant flow channel structure 32, so as to facilitate the flow of the first heat exchange medium and facilitate the heat exchange between the first heat exchange medium and the battery cell 21.

[0205] For example, the opposite sides of the partition plate 33 are respectively connected to the inner surface of the refrigerant flow channel structure 32 to connect to the base 31. At this time, the partition plate 33 and part of the base 31 can form a first cavity 321, and the other part of the partition plate 33 and the base 31 can form a second cavity 322.

[0206] The first cavity 321 is used to contain the first heat exchange medium, so that the first heat exchange medium can flow in the first cavity 321 and exchange heat with the battery cell assembly 20 corresponding to the refrigerant heat exchange component 30. That is, the first cavity 321 can be a long channel structure, so that the extension direction of the first cavity 321 is the same as or approximately the same as the extension direction of the refrigerant flow channel structure 32, so that the first heat exchange medium can exchange heat with the battery cell assembly 20 corresponding to the refrigerant heat exchange component 30 when flowing in the first cavity 321.

[0207] The first heat exchange medium refers to the medium used for heat exchange between the battery cells 21 in the refrigerant heat exchange component 30. The first heat exchange medium may include liquid medium, gaseous medium, solid-liquid mixture medium, etc.; the first heat exchange medium may include refrigerant, for example, the first heat exchange medium may include tetrafluoroethane, difluoromethane, pentafluoroethane, etc.; the first heat exchange medium may also include coolant, for example, the first heat exchange medium may include water, ethylene glycol aqueous solution, etc.

[0208] The second cavity 322 is used to protect the first cavity 321. The second cavity 322 can be empty or filled with energy-absorbing material to absorb collision energy, thereby protecting the first cavity 321 and the corresponding part of the substrate 31.

[0209] At least a portion of the second cavity 322 is located on the side of the first cavity 321 away from the battery cell assembly 20. That is, only a portion of the second cavity 322 can be located on the side of the first cavity 321 away from the battery cell assembly 20, or the entire second cavity 322 can be located on the side of the first cavity 321 away from the battery cell assembly 20.

[0210] The first cavity 321 is located on the side away from the battery cell 21, that is, the side of the first cavity 321 facing away from the housing 10. In the event of a collision with the battery device 100, this arrangement allows the second cavity 322 and the corresponding parts of the base 31 to be impacted first and bear the impact energy. At this time, the second cavity 322 and the corresponding parts of the base 31 can deform and absorb part of the impact energy, thereby reducing the impact energy borne by the partition plate 33 and the corresponding parts of the base 31 in the first cavity 321, reducing the risk of deformation of the partition plate 33 and the corresponding parts of the base 31 in the first cavity 321, and thus reducing the negative impact that the collision may have on the flow of the first heat exchange medium in the first cavity 321.

[0211] When the battery device 100 is subjected to an external impact, the substrate 31 is at risk of deformation after the impact. The deformed substrate 31 may reduce the local flow area of ​​the first cavity 321, or even cause the first cavity 321 to be partially blocked. It may also cause the substrate 31 to break and cause the first heat exchange medium to be lost, thereby weakening or failing the heat exchange performance of the refrigerant heat exchange component 30 at the deformed part of the substrate 31.

[0212] Accordingly, in this embodiment, a partition plate 33 is provided in the refrigerant flow channel structure 32 of the refrigerant heat exchange assembly 30 to divide the refrigerant flow channel structure 32 into a first cavity 321 and a second cavity 322. The first cavity 321 is used to supply the flow of the first heat exchange medium to control the temperature of the battery cell 21. The second cavity 322 is located on the side of the first cavity 321 away from the battery cell 21 so that the energy generated by the collision can be absorbed through the second cavity 322, thereby reducing the interference of the collision on the flow of the first heat exchange medium, reducing the deformation risk of the partition plate 33 and the parts of the substrate 31 corresponding to the first cavity 321, improving the stability of the refrigerant heat exchange assembly 30, and reducing the negative impact of the collision on the battery device 100.

[0213] Thirdly, this application provides another battery device 100, including: a housing 10, a battery cell assembly 20, and a refrigerant heat exchange assembly 30. The battery cell assembly 20 is housed within the housing 10; the refrigerant heat exchange assembly 30 includes a base 31 and a refrigerant flow channel structure 32 disposed within the base 31. The base 31 is connected to the housing 10 and located on one side of the battery cell assembly 20. The refrigerant flow channel structure 32 is provided with a partition plate 33 connected to the base 31, dividing the refrigerant flow channel structure 32 into a first cavity 321 and a second cavity 322. The first cavity 321 is configured to contain and allow flow of a first heat exchange medium for heat exchange with the battery cell assembly 20. The second cavity 322 is configured to contain and allow flow of a second heat exchange medium for heat exchange with the first cavity 321.

[0214] Similar to some embodiments of the first aspect, housing 10 refers to the structure in battery device 100 that provides a fixed foundation for structures such as battery cells 21 and controllers 300; battery cell assembly 20 refers to the structure in battery device 100 that provides voltage and capacity, and battery device 100 may include one or more battery cell assemblies 20.

[0215] Similar to some embodiments of the first aspect, the refrigerant heat exchange assembly 30 is a structure in the battery device 100 used for heat exchange with the battery cell 21; the substrate 31 refers to the structure in the refrigerant heat exchange assembly 30 used to provide a foundation for the refrigerant flow channel structure 32 or other structures; the refrigerant flow channel structure 32 refers to a channel structure disposed within the substrate 31 for the flow of the first heat exchange medium; the partition plate 33 refers to a plate structure disposed within the refrigerant flow channel structure 32, and the partition plate 33 can be a flat plate or a curved plate structure; the material of the partition plate 33 can include metal, plastic or other materials, and the partition plate 33 can divide the refrigerant flow channel structure 32 into a first cavity 321 and a second cavity 322.

[0216] The second cavity 322 can be a closed space structure or a circulating space structure.

[0217] The second heat exchange medium can flow within the second cavity 322. The second heat exchange medium refers to a medium capable of exchanging heat with the partition plate 33 and the first heat exchange medium. The second heat exchange medium may include liquid medium, gaseous medium, solid-liquid mixture, etc. The material of the second heat exchange medium may include refrigerant, for example, the second heat exchange medium may include tetrafluoroethane, difluoromethane, pentafluoroethane, etc. The material of the second heat exchange medium may also include coolant, for example, the second heat exchange medium may include water, ethylene glycol aqueous solution, etc.

[0218] The second heat exchange medium can flow within the second cavity 322 to transport and regulate heat. At the higher-temperature portion of the first cavity 321, the second heat exchange medium in the second cavity 322 exchanges more heat with the corresponding partition plate 33 and the first heat exchange medium, resulting in a larger temperature drop at that location in the first cavity 321. At this point, the second heat exchange medium carries a higher amount of heat. Subsequently, the second heat exchange medium flows to the location in the second cavity 322 corresponding to the lower-temperature portion of the first cavity 321. The second heat exchange medium releases heat to the corresponding partition plate 33 and the first heat exchange medium, causing the temperature of that location in the first cavity 321 to rise. The first heat exchange medium and the partition plate 33 can also transfer less heat to the second heat exchange medium, resulting in a smaller temperature rise or drop at the corresponding location in the first cavity 321. This reduces the temperature difference between different parts of the first cavity 321, allowing the refrigerant heat exchange assembly 30 to more uniformly control the temperature of the corresponding battery cell assembly 20 and reduce temperature differences between different locations within the corresponding battery cell assembly 20.

[0219] Unlike some embodiments of the first aspect, the positions of the first cavity 321 and the second cavity 322 in this application can be arranged along the height direction Z of the battery device 100, or they can be arranged along a first direction. When the first cavity 321 and the second cavity 322 can be arranged along the height direction Z of the battery device 100, the first cavity 321 can be located on the side of the second cavity 322 facing the battery cell assembly 20, or the first cavity 321 can be located on the side of the second cavity 322 away from the battery cell assembly 20.

[0220] In this embodiment, a second heat exchange medium is provided in the second cavity 322 to adjust the temperature distribution of the first heat exchange medium. At this time, the second cavity 322 and the second heat exchange medium can not only perform temperature equalization treatment on the first heat exchange medium in the first cavity 321, but also absorb and consume collision energy.

[0221] Fourthly, embodiments of this application also provide an electrical device, including a battery device 100 provided in some embodiments of the first aspect, or a refrigerant heat exchange assembly 30 provided in some embodiments of the second aspect, or a battery device 100 provided in some embodiments of the third aspect. In this battery device 100, the second cavity 322 of the refrigerant heat exchange assembly 30 can absorb a portion of the impact energy when the battery device 100 is subjected to an impact, thereby reducing the impact energy transferred to the first cavity 321, thus reducing the interference caused by the impact on the flow of the first heat exchange medium, improving the stability of the refrigerant heat exchange assembly 30, and reducing the negative impact of the impact on the battery device 100.

[0222] The electrical device provided in this application embodiment may also include the battery device 100 provided in some embodiments of the second aspect. In this battery device 100, a second heat exchange medium is provided in the second cavity 322 of the refrigerant heat exchange component 30, so as to reduce the temperature difference at different locations of the refrigerant heat exchange component 30, thereby reducing the temperature difference of the battery cells 21 at different locations, and thus improving the stability and service life of the battery device 100.

[0223] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The application relates to a battery pack, which comprises a box body, a battery cell assembly contained in the box body, and a refrigerant heat exchange assembly comprising a base body and a refrigerant flow channel structure arranged in the base body. The base body is connected to the box body and located at one side of the battery cell assembly. The strength of the base body corresponding to the first cavity is greater than the strength of the base body corresponding to the second cavity. The first cavity is provided with a first plate body connected to the base body and / or the partition plate. The number of the first plate bodies is greater than the number of the second plate bodies.

2. The battery device according to claim 1, characterized by The thickness of the first plate bodies is greater than the thickness of the second plate bodies.

3. The battery device of claim 2, wherein, One side of the first plate body is connected to the partition plate, and the other side of the first plate body is connected to the base body, so as to divide the first cavity into at least two first sub-cavities. One side of the second plate body is connected to the partition plate, and the other side of the second plate body is connected to the base body, so as to divide the second cavity into at least two second sub-cavities.

4. The battery device of claim 3, wherein The base body comprises a first part and a second part connected to the first part.

5. The battery device according to claim 3 or 4, characterized by The thickness of the first part is greater than the thickness of the second part.

6. The battery device according to any one of claims 3 to 5, wherein The second cavity contains a second heat exchange medium. The second cavity is a closed space structure, and the second heat exchange medium is a phase change material.

7. The battery device according to any one of claims 2 to 6, wherein The second cavity is a circulating space structure, and the second heat exchange medium is configured to flow in the second cavity.

8. The battery device according to any one of claims 2 to 7, characterized by, The base body is an integrally formed structure. The base body is a pipeline structure.

9. The battery device according to any one of claims 1 to 8, characterized by, The base body is an integrally extruded structure, and the base body is bent to form the refrigerant heat exchange assembly.

10. The battery device of claim 9, wherein, The base body is connected to the box body and located at one side of the battery cell assembly.

11. The battery device of claim 9, wherein, The base body is connected to the box body and located at one side of the battery cell assembly.

12. The battery device of any one of claims 1-11, wherein, ​ 13. The battery device of any one of claims 1-12, wherein, ​ 14. The battery device of any one of claims 1-13, wherein, ​ 15. A refrigerant heat exchange assembly comprising: ​ ​ 16. A battery device characterized by comprising: ​ ​ ​ The refrigerant heat exchange assembly comprises a base body and a refrigerant flow channel structure arranged in the base body, the base body is connected to the box body and located at one side of the battery monomer assembly, a partition plate connected to the base body is arranged in the refrigerant flow channel structure, the partition plate divides the refrigerant flow channel structure into a first cavity and a second cavity, the first cavity is configured to accommodate and flow a first heat exchange medium to exchange heat with the battery monomer assembly, and the second cavity is configured to accommodate and flow a second heat exchange medium to exchange heat with the first cavity.

17. An electrical device, comprising: The battery device comprises the battery device as claimed in any one of claims 1-14, or the refrigerant heat exchange assembly as claimed in claim 15, or the battery device as claimed in claim 16.

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