Battery devices, electrical devices and energy storage devices

Abstract

This application provides a battery device, an electrical device, and an energy storage device, belonging to the field of batteries. The battery device includes: a housing and at least one battery cell assembly. The battery cell assembly is housed within the housing. The battery cell assembly includes multiple electrical connection portions and multiple battery cells arranged along a first direction. The electrical connection portions are used to electrically connect the electrode terminals of adjacent battery cells, and each electrical connection portion is provided with a heat exchange channel. The heat exchange channels of each electrical connection portion are arranged in parallel, allowing the heat exchange medium to enter and exit each heat exchange channel in parallel. The heat exchange medium is an insulating heat exchange medium. By providing heat exchange channels in the electrical connection portions, and because the heat exchange channels are arranged in parallel, the temperature of the heat exchange medium entering each electrical connection portion is consistent, improving the temperature uniformity of each electrical connection portion, thereby improving the cooling effect of the battery device and enhancing its lifespan and safety.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, an electrical device, and an energy storage device. Background Technology

[0002] Energy conservation and emission reduction are key to sustainable social development, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In related technologies, a large amount of heat is generated during the charging and discharging process of battery devices. If the heat cannot be dissipated in time, it may affect the life of the battery device. Therefore, how to dissipate the heat in time is a research hotspot. Utility Model Content

[0004] This application aims to at least solve one of the technical problems existing in the background art. Therefore, one object of this application is to provide a battery device, an electrical device, and an energy storage device to improve the heat dissipation capacity of the battery device.

[0005] An embodiment of the first aspect of this application provides a battery device, including: a housing and at least one battery cell assembly housed in the housing. The battery cell assembly includes a plurality of electrical connection portions and a plurality of battery cells arranged along a first direction. The electrical connection portions are used to electrically connect the electrode terminals of two adjacent battery cells, and the electrical connection portions are provided with heat exchange channels. The heat exchange channels of each electrical connection portion are arranged in parallel so that the heat exchange medium can enter each heat exchange channel in parallel and flow out of each heat exchange channel in parallel. The heat exchange medium is an insulating heat exchange medium.

[0006] In the technical solution of this application embodiment, since a heat exchange channel is provided in the electrical connection part, the high heat generated at the connection between the electrical connection part and the electrode terminal during the charging and discharging of the battery cell can be discharged through the heat exchange medium of the heat exchange channel, thereby achieving rapid cooling of the electrical connection part, and further achieving heat dissipation at the top of the battery cell. The heat dissipation effect is better, improving the life and safety of the battery device. In addition, by arranging the heat exchange channels of each electrical connection part in the battery cell assembly in parallel, the heat exchange medium can be evenly and parallelly distributed to each electrical connection part. This ensures that the initial temperature of the heat exchange medium entering each electrical connection part is approximately the same. Compared with the cooling method in related technologies where the coolant passes through each plate sequentially, this embodiment can improve the uniformity of the initial temperature of the heat exchange medium entering each electrical connection part, thereby making the temperature of the electrical connection part and the top of each battery cell more uniform after heat exchange, thus improving the heat exchange effect and further improving the life and safety of the battery device.

[0007] In some embodiments, the battery device further includes a total inlet pipe and a total outlet pipe; the heat exchange channels have inlets and outlets, the inlets of each heat exchange channel are respectively connected to the total inlet pipe, and the outlets of each heat exchange channel are respectively connected to the total outlet pipe, so that the heat exchange medium in the total inlet pipe can enter each heat exchange channel in parallel through each inlet and flow out of each heat exchange channel in parallel from each outlet.

[0008] In this embodiment, the parallel connection of each heat exchange channel can be achieved through the total input pipeline and the total output pipeline, and the structure is simple and easy to implement.

[0009] In some embodiments, an electrical connection portion is connected to each of the two electrode terminals of a battery cell, and in the electrical connection portion connected to one of the electrode terminals, the inlet and outlet of the heat exchange channel are located on the side of the electrical connection portion away from the other electrode terminal.

[0010] By placing the inlet and outlet on the same side of the electrical connection section, the space on the side of the electrical connection section can be utilized, thereby reducing the space occupied in the vertical direction and improving the energy density of the battery. At the same time, the inlet and outlet can be oriented towards the outside of the battery cell assembly to facilitate connection with heat exchange equipment.

[0011] In some embodiments, the electrical connection portion has a first connection portion and a second connection portion. The first connection portion is connected to the electrode terminal of one of two adjacent battery cells, and the second connection portion is connected to the electrode terminal of the other of the two adjacent battery cells. The heat exchange channel includes a first sub-channel and a second sub-channel that are isolated from each other. The first sub-channel is heat-exchange connected to the first connection portion, and the second sub-channel is heat-exchange connected to the second connection portion. The first sub-channel and the second sub-channel are arranged in parallel.

[0012] By setting a first sub-channel and a second sub-channel in the heat exchange channel of the electrical connection, with the first sub-channel thermally connected to the first connection and the second sub-channel thermally connected to the second connection, heat exchange can be targeted to parts or areas with high heat generation, improving the heat exchange effect. At the same time, the initial temperature of the heat exchange medium entering the first and second sub-channels can be made approximately the same, improving the temperature uniformity of the first and second connections after heat exchange. This results in a more uniform temperature in the electrical connection and the top of each battery cell, further improving the heat exchange effect and enhancing the lifespan and safety of the battery device.

[0013] In some embodiments, a superhydrophobic layer is provided on the surface of the electrical connection portion away from the battery cell to suppress the accumulation of condensate.

[0014] In this embodiment, the superhydrophobic layer can reduce the adhesion of the electrical connection surface, making it difficult for condensate to adhere or making it easier for condensate to roll off the surface, thereby improving the dryness of the electrical connection surface, reducing condensate residue, and improving short circuit conditions.

[0015] In some embodiments, the electrical connection includes a first top wall and a first bottom wall disposed opposite to the first top wall, the edges of the first top wall and the edges of the first bottom wall being connected to form a heat exchange channel.

[0016] This embodiment makes the structure of the electrical connection more compact and reduces the height of the electrical connection by setting the heat exchange channel inside the electrical connection part, thereby improving the energy density of the battery device while achieving heat exchange and cooling.

[0017] In some embodiments, the electrical connection portion has a first connection portion and a second connection portion. The first connection portion is connected to the electrode terminal of one of two adjacent battery cells, and the second connection portion is connected to the electrode terminal of the other of the two adjacent battery cells. The first connection portion is formed by connecting a portion of a first top wall and a portion of a first bottom wall, and the second connection portion is formed by connecting a portion of a first top wall and a portion of a first bottom wall. A heat exchange channel surrounds the first connection portion and the second connection portion.

[0018] In this embodiment, since the first connecting part and the second connecting part are connected to the electrode terminals, they generate a high amount of heat. By arranging the heat exchange channel around the first connecting part and the second connecting part, the heat exchange effect can be effectively improved.

[0019] In some embodiments, the heat exchange channel includes a main heat exchange channel surrounding the first connection portion and the second connection portion, a first channel connecting the main heat exchange channel and the inlet of the heat exchange channel, and a second channel connecting the main heat exchange channel and the outlet of the heat exchange channel; the first channel and the second channel are respectively connected to opposite sides of the main heat exchange channel.

[0020] In this embodiment, after the heat exchange medium enters the main heat exchange channel through the first flow channel, since the first connecting part and the second connecting part are located in the area enclosed by the main heat exchange channel, the heat exchange medium can undergo sufficient heat exchange, and then flows out through the second flow channel, thereby improving the heat exchange effect.

[0021] In some embodiments, the heat exchange channel includes a first sub-channel and a second sub-channel that are isolated from each other. The first sub-channel is disposed around a first connecting portion, and the second sub-channel is disposed around a second connecting portion. The first sub-channel and the second sub-channel are arranged in parallel.

[0022] By setting a first sub-channel and a second sub-channel in the heat exchange channel of the electrical connection, with the first sub-channel surrounding the first connection and the second sub-channel surrounding the second connection, heat exchange can be performed on areas with high heat, improving the heat exchange effect. At the same time, the initial temperature of the heat exchange medium entering the first and second sub-channels can be made approximately the same, improving the temperature uniformity of the first and second connections after heat exchange. This results in a more uniform temperature in the electrical connection and on the top of each battery cell, further improving the heat exchange effect and enhancing the lifespan and safety of the battery device.

[0023] In some embodiments, the electrical connection portion includes a conductive portion and a heat exchange portion. The conductive portion is used to electrically connect the electrode terminals of two adjacent battery cells, and the heat exchange portion is heat-connected to the side of the conductive portion away from the battery cells. The heat exchange portion has a heat exchange channel inside.

[0024] Electrical connections between individual battery cells can be achieved through conductive and heat exchange components, while simultaneously improving heat dissipation. Furthermore, the conductive components can utilize common electrical connection structures in related technologies, such as heat exchange plates, and heat dissipation can be achieved through additional heat exchange components, reducing costs and offering good versatility.

[0025] In some embodiments, the heat exchange portion has a first surface facing the conductive portion, the conductive portion has a second surface facing the heat exchange portion, the shape of the first surface matches the shape of the second surface, and the first surface and the second surface are in close contact.

[0026] In this embodiment, by matching the shapes of the first and second surfaces and fitting them together, the heat exchange part can be completely attached to the conductive part, increasing the contact area between them and thus improving the heat exchange effect.

[0027] In some embodiments, the conductive part is welded to the heat exchange part, and a thermally conductive medium is filled between the conductive part and the heat exchange part; or, the conductive part is bonded to the heat exchange part by a thermally conductive adhesive part.

[0028] In this embodiment, the connection between the heat exchange section and the conductive section can be achieved through the above methods, and the thermal conductivity between the two can be improved, which is beneficial to improving the heat dissipation effect.

[0029] In some embodiments, the conductive portion has a first connection portion and a second connection portion arranged along a first direction. The first connection portion is connected to the electrode terminal of one of two adjacent battery cells, and the second connection portion is connected to the electrode terminal of the other of the two adjacent battery cells. The heat exchange channel includes a plurality of sub-channels connected sequentially along a second direction. Each of the plurality of sub-channels extends along the first direction, and the flow directions of the heat exchange medium in two adjacent sub-channels are opposite. At least two adjacent sub-channels have heat exchange medium that can flow through the region where the first connection portion is located and the region where the second connection portion is located, wherein the first direction intersects the second direction.

[0030] In this embodiment, by setting multiple sub-channels, the cooler heat exchange medium can pass through the first connecting part, the second connecting part, the second connecting part, the first connecting part, and so on in sequence. This allows the areas where heat exchange is preferentially carried out in each sub-channel to change alternately, making the temperature of the first and second connecting parts more uniform after heat exchange, resulting in good heat dissipation and achieving uniform heat dissipation.

[0031] In some embodiments, the housing is provided with a heat exchanger, the battery cell assembly is heat-exchange connected to the heat exchanger, and the heat exchanger is located on the side of the battery cell away from the electrical connection portion.

[0032] In this embodiment, a heat exchanger is provided at the bottom of the housing, and a medium is used to flow inside the heat exchanger to achieve heat exchange. The battery cell assembly is located on top of the heat exchanger, and the bottom of the battery cell away from the electrical connection part is thermally connected to the heat exchanger. This allows the bottom of the battery cell to be cooled through the heat exchanger, and the top of the battery cell to be cooled through the heat exchange channel in the electrical connection part. The combination of the top and bottom improves the cooling effect, effectively reduces the temperature difference between battery cells, and improves the life and safety of the battery device.

[0033] An embodiment of the second aspect of this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0034] An embodiment of the third aspect of this application provides an energy storage device, which includes the battery device in the above embodiments, and the energy storage device is used to store electrical energy.

[0035] 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, the following are specific embodiments of this application. Attached Figure Description

[0036] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0037] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0038] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0039] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0040] Figure 4 This is a schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;

[0041] Figure 5 for Figure 4 A schematic diagram of the parallel structure of each electrical connection part in the middle;

[0042] Figure 6 for Figure 5 Schematic diagram of the electrical connection part;

[0043] Figure 7 for Figure 6 A schematic diagram of the partial structure after being cut open from face A;

[0044] Figure 8 for Figure 6 A schematic diagram of the cross-section after cutting through section B in the middle;

[0045] Figure 9 for Figure 6 Another structural diagram of the central heat exchange channel;

[0046] Figure 10 This is a schematic diagram of the parallel structure of various electrical connections provided in some embodiments of this application;

[0047] Figure 11 for Figure 10 Schematic diagram of the electrical connection part;

[0048] Figure 12 for Figure 11 Schematic diagram of the heat exchange section.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1000 vehicles;

[0051] Battery unit 100, controller 200, motor 300;

[0052] Battery cell assembly 10, battery cell 11, end cap 12, housing 13, electrode assembly 14, electrode terminal 15;

[0053] Box body 20, first part 21, second part 22, heat exchanger 23;

[0054] Electrical connection 400, heat exchange channel 410, inlet 411, outlet 412, first sub-channel 413, second sub-channel 414, sub-flow channel 415, main heat exchange flow channel 461, first flow channel 462, second flow channel 463, first connection 421, second connection 422, first top wall 431, first bottom wall 432, conductive part 440, second surface 441, heat exchange part 450, first surface 451;

[0055] Total input pipeline 500, total output pipeline 600, superhydrophobic layer 700. Detailed Implementation

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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 three cases: a exists alone, a and b exist simultaneously, and b exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0061] 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).

[0062] 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.

[0063] 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.

[0064] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0065] In related technologies, battery devices consist of multiple battery cells, which can be connected in series or parallel using components such as solar panels. Additionally, a cooling plate is typically installed at the bottom of each battery cell to cool it.

[0066] However, the inventors discovered that the temperature of the upper mechanical connection part of the battery cell (e.g., the connection part between the battery cell's terminal and the battery plate) is relatively high. The heat dissipation scheme of setting a cold plate at the bottom of the battery cell in the related technology cannot effectively cool the upper part of the battery cell, resulting in poor cooling effect of the battery cell, which in turn affects the life and safety of the battery device.

[0067] Another related technology involves a plate-based cooling method where the coolant passes sequentially through each plate and exchanges heat with it. However, in this method, the coolant enters each plate at a different temperature, resulting in temperature differences between the plates after cooling and poor cooling performance. Furthermore, condensation easily accumulates on the top of the plates, increasing the risk of short circuits.

[0068] This application provides a battery device, an electrical device, and an energy storage device. The battery device includes a housing and at least one battery cell assembly. The battery cell assembly is housed within the housing. The battery cell assembly includes multiple electrical connection portions and multiple battery cells arranged along a first direction. The electrical connection portions are used to electrically connect the electrode terminals of two adjacent battery cells, and each electrical connection portion is provided with a heat exchange channel. The heat exchange channels of each electrical connection portion are arranged in parallel so that the heat exchange medium can enter and exit each heat exchange channel in parallel. The heat exchange medium is an insulating heat exchange medium. In this embodiment, by providing heat exchange channels in the electrical connection portions, the heat exchange medium flowing in the heat exchange channels can exchange heat with the electrical connection portions, thereby cooling the battery cells connected to the electrical connection portions and improving the cooling effect of the upper part of the battery cells. In addition, since the heat exchange channels are arranged in parallel, the temperature of the heat exchange medium entering each electrical connection portion is consistent, improving the temperature uniformity of each electrical connection portion, thereby improving the cooling effect of the battery device and enhancing the lifespan and safety of the battery device.

[0069] The technical solutions described in the embodiments of this application are applicable to battery devices containing multiple battery cells, electrical devices using battery devices, and energy storage devices.

[0070] The energy storage device utilizing battery devices as a power source in this application embodiment includes one or more battery clusters to enhance the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0071] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices. As an example, the energy storage device is an energy storage container or an energy storage cabinet.

[0072] In this application embodiment, the power-consuming device using a battery as a power source 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.

[0073] It should be understood that the technical solutions described in the embodiments of this application are not limited to the energy storage devices and electrical devices described above, but can also be applied to all battery devices including housings and electrical devices using battery devices. This allows for heat dissipation from the upper part of the battery cells, improving the lifespan of the battery device. However, for the sake of brevity, the following embodiments will use a vehicle as an example of the electrical device.

[0074] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 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 device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0075] In some embodiments of this application, the battery device 100 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.

[0076] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery provided in some embodiments of this application.

[0077] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 may include multiple battery cells 11, which are connected in series, parallel, or mixed connection via a busbar.

[0078] In some embodiments, the battery cell assembly 10 is typically formed by arranging a plurality of battery cells 11.

[0079] As an example, the battery cell assembly 10 can be a battery module, which is formed by arranging and fixing multiple battery cells 11 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 11 together with cable ties.

[0080] In some embodiments, such as Figure 2 As shown, the battery device 100 can be a battery pack, which includes a housing 20 and one or more individual battery cells 10, with the individual battery cells 10 housed within the housing 20. The housing 20 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of combinations of simple cuboids, cylinders, or spheres. The material of the housing 20 can be an alloy such as aluminum alloy or iron alloy, a polymer such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0081] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be housed in the housing 20 by fixing the battery module in the housing 20.

[0082] As an example, the battery cell assembly 10 can also be housed in the housing 20 by directly fixing multiple battery cells 11 to the housing 20.

[0083] As an example, the housing 20 may include a first part 21 and a second part 22. The first part 21 and the second part 22 are fastened together to form a closed space inside the housing 20 to house the battery cell assembly 10. Here, "closed" refers to covering or closing, and can be either non-sealed or sealed to prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 11. The first part 21 may be a top cover or a bottom plate.

[0084] As an example, the housing 20 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 20 forms an enclosed space to house the battery cell assembly 10.

[0085] In some embodiments, the housing 20 may be part of the vehicle's chassis structure. For example, a portion of the housing 20 may be at least a portion of the vehicle's floor, or a portion of the housing 20 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0086] The battery cell 11 provided in the embodiments of this application can be a secondary battery. A secondary battery refers to a battery cell 11 that can be used again after being discharged by recharging to activate the active material.

[0087] The battery cell 11 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.

[0088] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application. The battery cell 11 refers to the smallest unit that makes up the battery. For example... Figure 3 The battery cell 11 includes an end cap 12, a housing 13, an electrode assembly 14, and other functional components.

[0089] End cap 12 refers to a component that covers the opening of housing 13 to isolate the internal environment of battery cell 11 from the external environment. The shape of end cap 12 can be adapted to the shape of housing 13 to fit it. In some embodiments, end cap 12 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 12 is less prone to deformation under pressure and impact, allowing battery cell 11 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 15 can be provided on end cap 12. Electrode terminals 15 can be used for electrical connection with electrode assembly 14 for outputting or inputting electrical energy to battery cell 11. In some embodiments, end cap 12 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 11 reaches a threshold. The material of end cap 12 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating element may be provided on the inner side of the end cap 12. The insulating element can be used to isolate the electrical connection components within the housing 13 from the end cap 12 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0090] The housing 13 is a component used to cooperate with the end cap 12 to form the internal environment of the battery cell 11. This internal environment can accommodate the electrode assembly 14, electrolyte, and other components. The housing 13 and the end cap 12 can be independent components. An opening can be provided on the housing 13, and the end cap 12 closes the opening to form the internal environment of the battery cell 11. Alternatively, the end cap 12 and the housing 13 can be integrated. Specifically, the end cap 12 and the housing 13 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 13, the end cap 12 closes the housing 13. The housing 13 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 13 can be determined according to the specific shape and size of the electrode assembly 14. The housing 13 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0091] Electrode assembly 14 is the component in the battery cell 11 where the electrochemical reaction takes place. The housing 13 may contain one or more electrode assemblies 14. Electrode assembly 14 is mainly formed by winding and forming positive and negative electrode plates, and a separator is typically provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly.

[0092] Figure 4 This is a schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application; Figure 5 for Figure 4 A schematic diagram of the parallel structure of each electrical connection part in the middle; Figure 6 for Figure 5 Schematic diagram of the electrical connection part; Figure 7 for Figure 6 A schematic diagram of the partial structure after being cut open from face A; Figure 8 for Figure 6 A schematic diagram of the cross-section after cutting through surface B. Please refer to... Figures 4 to 8 This application provides a battery device 100, including: a housing 20 and at least one battery cell assembly 10. The battery cell assembly 10 is housed in the housing 20. The battery cell assembly 10 includes a plurality of electrical connection portions 400 and a plurality of battery cells 11 arranged along a first direction X. The electrical connection portions 400 are used to electrically connect the electrode terminals 15 of two adjacent battery cells 11, and the electrical connection portions 400 are provided with heat exchange channels 410. The heat exchange channels 410 of each electrical connection portion 400 are arranged in parallel so that the heat exchange medium can enter each heat exchange channel 410 in parallel and flow out of each heat exchange channel 410 in parallel. The heat exchange medium is an insulating heat exchange medium.

[0093] It is understood that the housing 20 may contain one or more battery cell assemblies 10, and each battery cell assembly 10 may include multiple battery cells 11 arranged along the first direction X. The multiple battery cells 11 can be connected in series, parallel, or in a mixed configuration via multiple electrical connection parts 400. The electrical connection part 400 may be a conductor connecting piece or similar structure connecting the electrode terminals of two battery cells, and it can serve as a current carrier to achieve stable current transmission between the battery cells.

[0094] In this embodiment, as Figure 4 As shown, the third direction Z can be the height direction of the battery cell 11, the first direction X can be the width direction of the battery cell 11, and the second direction Y can be the length direction of the battery cell 11. Each battery cell 11 can have two electrode terminals 15 (one positive terminal and one negative terminal), and these two electrode terminals 15 can be arranged along the second direction Y.

[0095] Continue to refer to Figure 4 Two adjacent battery cells 11 can be electrically connected through an electrical connection portion 400. The electrode terminal 15 on the left side of the battery cell 11 along the second direction Y is designated as the first electrode terminal, and the electrode terminal 15 on the right side is designated as the second electrode terminal. The first electrode terminal of the battery cell 11 can be electrically connected to the first electrode terminal of the battery cell 11 adjacent to it on one side through an electrical connection portion 400. The second electrode terminal of the battery cell 11 can be electrically connected to the second electrode terminal of the battery cell 11 adjacent to it on the other side through an electrical connection portion 400, thereby achieving electrical connection between the battery cells in the battery cell assembly 10.

[0096] Understandable. Figure 4 This only shows one possible connection method for multiple battery cells through the electrical connection part 400. In other embodiments, there may be other different connection methods between the electrical connection part 400 and the battery cells, which can be set according to the requirements.

[0097] The electrical connection part 400 can be used for conducting electricity and may include conductive materials such as copper, aluminum, and iron. The electrical connection part 400 can also have various shapes, for example... Figure 4 In this part, the electrical connection 400 can generally be a sheet-like structure with a relatively small thickness (third-direction Z dimension). Its shape can be square, circular, or other irregular shapes.

[0098] In this embodiment, a heat exchange channel 410 may be provided in the electrical connection part 400. The heat exchange channel 410 may be a cavity or a flow channel or other structure, and its interior may be used to circulate heat exchange medium in order to achieve heat exchange and cooling of the electrical connection part 400.

[0099] The heat exchange channel 410 can have various shapes, such as a square, a circular cavity, or an S-shaped flow channel.

[0100] The heat exchange medium can be an insulating medium, such as mineral insulating oil, silicone oil, single-phase fluorinated liquid, two-phase fluorinated liquid, or other non-conductive media. Using an insulating heat exchange medium can reduce the risk of short circuits.

[0101] In this embodiment, the heat exchange channels 410 in each electrical connection are arranged in parallel. For example, each electrical connection 400 may have one heat exchange channel 410, and all heat exchange channels 410 in the battery cell assembly 10 are arranged in parallel. Parallel arrangement can be understood as the heat exchange medium entering and exiting each heat exchange channel 410 in parallel. For example, the inlet of each heat exchange channel 410 can be connected to the output port of a heat exchange device (e.g., a refrigeration device), and the outlet of each heat exchange channel 410 can be connected to the input port of the heat exchange device. This allows the heat exchange medium flowing out of the output port to enter the inlet of each heat exchange channel synchronously and in parallel, and the heat exchange medium after heat exchange in the heat exchange channel can also enter the input port in parallel, thereby achieving circulation of the heat exchange medium.

[0102] In this embodiment, since a heat exchange channel is provided inside the electrical connection part, the high heat generated at the connection between the electrical connection part and the electrode terminals during the charging and discharging of the battery cell can be discharged through the heat exchange medium of the heat exchange channel, thereby achieving rapid cooling of the electrical connection part, and further achieving heat dissipation at the top of the battery cell. The heat dissipation effect is better, and the life and safety of the battery device are improved.

[0103] Furthermore, by arranging the heat exchange channels of each electrical connection in the battery cell assembly in parallel, the heat exchange medium can be evenly and parallelly distributed to each electrical connection. This ensures that the initial temperature of the heat exchange medium entering each electrical connection is approximately the same. Compared to the cooling method in related technologies where the coolant passes through each plate sequentially, this embodiment can improve the uniformity of the initial temperature of the heat exchange medium entering each electrical connection. This results in a more uniform temperature in the electrical connection and the top of each battery cell after heat exchange, thereby improving the heat exchange effect and further enhancing the lifespan and safety of the battery device.

[0104] According to some embodiments of this application, the housing 20 is provided with a heat exchanger 23, the battery cell assembly 10 is heat-exchange connected to the heat exchanger 23, and the heat exchanger 23 is located on the side of the battery cell 11 away from the electrical connection portion 400.

[0105] The heat exchanger 23 can be a heat exchange structure such as a cold plate, and it may have an internal cavity. A medium can flow within the heat exchanger 23, and this medium is not limited to an insulating medium. The heat exchanger 23 can be located at the bottom of the housing or form the bottom wall of the housing. The battery cell assembly 10 can be mounted on the heat exchanger, for example, by adhesive bonding.

[0106] It is understandable that the bottom of the battery cell 11 can exchange heat with the heat exchanger, and the top of the battery cell 11 can exchange heat through the heat exchange medium in the electrical connection part.

[0107] When the battery device is charging and discharging, the battery management system starts to deliver cooled insulating heat exchange medium to the inside of the electrical connection part based on the collected temperature. The heat exchange medium can cool the electrical connection part and achieve temperature balance between the top and bottom of the battery cell.

[0108] In this embodiment, a heat exchange component (e.g., a cold plate) is provided at the bottom of the housing. A medium is circulated inside the heat exchange component to achieve heat exchange. The battery cell assembly is located on top of the heat exchange component, and the bottom of the battery cell away from the electrical connection part is thermally connected to the heat exchange component. This allows the bottom of the battery cell to be cooled through the heat exchange component, and the top of the battery cell to be cooled through the heat exchange channel in the electrical connection part. The combination of the top and bottom improves the cooling effect, effectively reduces the temperature difference between battery cells, and improves the life and safety of the battery device.

[0109] In other embodiments, the heat exchanger may be positioned in other locations, such as between the large surfaces of two adjacent battery cells, thereby providing heat exchange and cooling to the battery cells from the side.

[0110] According to some embodiments of this application, such as Figures 4 to 6 As shown, the battery device 100 also includes a total input pipe 500 and a total output pipe 600; the heat exchange channel 410 has an inlet 411 and an outlet 412, the inlet 411 of each heat exchange channel 410 is connected to the total input pipe 500, and the outlet 412 of each heat exchange channel 410 is connected to the total output pipe 600, so that the heat exchange medium in the total input pipe 500 can enter each heat exchange channel 410 in parallel through each inlet 411 and flow out of each heat exchange channel 410 in parallel from each outlet 412.

[0111] The battery device 100 may have a main inlet pipe 500 and a main outlet pipe 600. The main inlet pipe may be connected to the output port of a heat exchange device, and the main outlet pipe may be connected to the inlet port of the heat exchange device. It is understood that each battery cell assembly may have one main inlet pipe 500 and one main outlet pipe 600, or adjacent battery cell assemblies may share one main inlet pipe 500 or one main outlet pipe 600, depending on the actual situation. The main inlet pipe 500 and the main outlet pipe 600 may be tubular structures or channels formed in a solid structure. In some embodiments, the main inlet pipe 500 and the main outlet pipe 600 may be insulated flexible hoses.

[0112] It is understood that each heat exchange channel may have an inlet 411 and an outlet 412. The heat exchange medium can enter the heat exchange channel 410 through the inlet 411 and flow out of the heat exchange channel 410 through the outlet 412 to achieve heat exchange with the electrical connection part 400. The inlet 411 and outlet 412 may be provided on the surface of the electrical connection part, or the electrical connection part may have a pipe joint for connecting to a main input pipe or a main output pipe. The pipe joint may be extended from the electrical connection part, and the inlet and outlet may be the ports of the pipe joint.

[0113] Figure 5 In the process, each heat exchange channel 410 can have an inlet 411 and an outlet 412. Each inlet 411 of each heat exchange channel 410 can be connected to the main input pipeline 500, and each outlet 412 of each heat exchange channel 410 can be connected to the main output pipeline 600.

[0114] The heat exchange medium with a lower temperature output from the outlet of the heat exchange equipment can enter each inlet 411 in parallel through the main inlet pipe 500. The heat exchange medium with a higher temperature after heat exchange in each heat exchange channel 410 can also enter the main outlet pipe 600 in parallel through each outlet 412, and then enter the heat exchange equipment to realize the circulation of the heat exchange medium.

[0115] In some embodiments, such as Figure 5 As shown, the total input pipe 500 and the total output pipe 600 are respectively arranged around the top edge of the battery cell assembly along the third direction Z, so that the total input pipe and the total output pipe can be arranged in a reasonable way to utilize the top edge of the battery cell assembly and improve space utilization.

[0116] In this embodiment, the parallel connection of each heat exchange channel can be achieved through the total input pipeline and the total output pipeline, and the structure is simple and easy to implement.

[0117] According to some embodiments of this application, an electrical connection portion 400 is connected to each of the two electrode terminals 15 of the battery cell 11, and in the electrical connection portion 400 connected to one of the electrode terminals 15, the inlet 411 and the outlet 412 of the heat exchange channel are located on the side of the electrical connection portion 400 away from the other electrode terminal 15.

[0118] In this embodiment, taking the two electrode terminals 15 on the battery cell 11 as the first electrode terminal and the second electrode terminal as an example, the inlet 411 and outlet 412 of the heat exchange channel on the electrical connection part 400 connected to the first electrode terminal of the battery cell can both be located on the side of the electrical connection part 400 away from the second electrode terminal of the battery cell.

[0119] Understandable. Figure 4 In this design, the inlet 411 and outlet 412 of the heat exchange channel in each electrical connection 400 can be connected to the side of the electrical connection 400, thereby increasing the energy density of the battery without occupying space in the height direction (third direction Z). At the same time, the inlet and outlet are away from the other electrode terminal, so that the inlet and outlet can be set towards the outside of the battery cell assembly to facilitate connection with heat exchange equipment.

[0120] In this embodiment, the electrical connection part 400 may have four sides surrounding the third direction Z, and the inlet 411 and the outlet 412 may be located on the same side.

[0121] By placing the inlet and outlet on the same side of the electrical connection section, the space on the side of the electrical connection section can be utilized, thereby reducing the space occupied in the vertical direction and improving the energy density of the battery. At the same time, the inlet and outlet can be oriented towards the outside of the battery cell assembly to facilitate connection with heat exchange equipment.

[0122] Figure 9 for Figure 6 Another structural diagram of the central heat exchange channel. Please refer to... Figures 5 to 7 as well as Figure 9 According to some embodiments of this application, the electrical connection portion 400 has a first connection portion 421 and a second connection portion 422. The first connection portion 421 is connected to the electrode terminal 15 of one of two adjacent battery cells 11, and the second connection portion 422 is connected to the electrode terminal 15 of the other of the two adjacent battery cells 11. The heat exchange channel 410 includes a first sub-channel 413 and a second sub-channel 414 that are isolated from each other. The first sub-channel 413 is heat-exchange connected to the first connection portion 421, and the second sub-channel 414 is heat-exchange connected to the second connection portion 422. The first sub-channel 413 and the second sub-channel 414 are arranged in parallel.

[0123] In this embodiment, each electrical connection 400 may have a first connection 421 and a second connection 422. The first connection 421 may be welded to the electrode terminal (post) of one battery cell 11, and the second connection 422 may be welded to the electrode terminal (post) of another battery cell 11. It can be understood that the first connection 421 and the second connection 422 may be two specific parts or regions of the electrical connection 400 that are connected to the two electrode terminals. This region is the connection point between the electrical connection and the battery cell, and it generates a high amount of heat.

[0124] The heat exchange channel 410 may include two independent sub-channels, namely a first sub-channel 413 and a second sub-channel 414. In this embodiment, the first sub-channel 413 may be thermally connected to the first connecting portion 421. For example, the first sub-channel 413 may surround the first connecting portion 421, or the wall surface of the first sub-channel 413 may be in contact with the first connecting portion 421. Similarly, the second sub-channel 414 may be thermally connected to the second connecting portion 422. For example, the second sub-channel 414 may surround the second connecting portion 422, or the wall surface of the second sub-channel 414 may be in contact with the second connecting portion 422.

[0125] The first sub-channel 413 and the second sub-channel 414 are isolated from each other, meaning they are not directly connected. The first sub-channel 413 and the second sub-channel 414 can be connected in parallel, so that the heat exchange medium can enter the first sub-channel and the second sub-channel in parallel, and then flow out of the first sub-channel and the second sub-channel in parallel.

[0126] It is understood that the first sub-channel 413 has a first inlet for the flow of heat exchange medium and a first outlet for the flow of heat exchange medium, and the second sub-channel 414 has a second inlet for the flow of heat exchange medium and a second outlet for the flow of heat exchange medium. The first inlet of the first sub-channel 413 and the second inlet of the second sub-channel 414 constitute the inlet 411 of the heat exchange channel 410, and the first outlet of the first sub-channel 413 and the second outlet of the second sub-channel 414 constitute the outlet 412 of the heat exchange channel 410.

[0127] By setting a first sub-channel and a second sub-channel in the heat exchange channel of the electrical connection, with the first sub-channel thermally connected to the first connection and the second sub-channel thermally connected to the second connection, heat exchange can be targeted to parts or areas with high heat generation, improving the heat exchange effect. At the same time, the initial temperature of the heat exchange medium entering the first and second sub-channels can be made approximately the same, improving the temperature uniformity of the first and second connections after heat exchange. This results in a more uniform temperature in the electrical connection and the top of each battery cell, further improving the heat exchange effect and enhancing the lifespan and safety of the battery device.

[0128] According to some embodiments of this application, please refer to Figure 6 The electrical connection portion 400 has a superhydrophobic layer 700 on the surface away from the battery cell 11 to suppress the accumulation of condensate.

[0129] The superhydrophobic layer 700 is a layered structure made of superhydrophobic material and can be disposed on the top surface of the electrical connection portion away from the battery cell 11.

[0130] Superhydrophobic materials are a class of biomimetic materials that have an extreme repulsion of water. Their core characteristics are that the static contact angle of water droplets on the surface exceeds 150° and the roll-off angle is less than 10°. Their properties are derived from the micro-nano secondary structure composed of micron-level protrusions and nano-level waxy structures similar to the surface of a lotus leaf, which makes it difficult for water droplets to accumulate and easier to roll off the surface.

[0131] Superhydrophobic materials can be made of materials such as graphene, carbon nanotubes, silicon-based materials, metal oxides, and halloysite. In some embodiments, they can be made of insulating materials.

[0132] It is understandable that, since the heat exchange medium cools the electrical connection, the surface of the electrical connection is prone to condensation due to excessive temperature difference.

[0133] In this embodiment, the superhydrophobic layer can reduce the adhesion of the electrical connection surface, making it difficult for condensate to adhere or making it easier for condensate to roll off the surface, thereby improving the dryness of the electrical connection surface, reducing condensate residue, and improving short circuit conditions.

[0134] In some embodiments, the electrical connection portion has a pipe fitting for connection to a main inlet pipe or a main outlet pipe. The pipe fitting may be an extension of the electrical connection portion, and the inlet and outlet may be ports of the pipe fitting. A superhydrophobic layer may also be provided on the surface of the pipe fitting to further improve the problem of condensate buildup.

[0135] According to some embodiments of this application, please refer to Figures 5 to 8 The electrical connection part 400 includes a first top wall 431 and a first bottom wall 432 disposed opposite to the first top wall 431. The edge of the first top wall 431 is connected to the edge of the first bottom wall 432 to form a heat exchange channel 410.

[0136] In this embodiment, the heat exchange channel 410 can be formed inside the electrical connection portion 400. The heat exchange channel 410 can have a first top wall 431 and a first bottom wall 432 disposed opposite each other along the third direction Z. The edges of the first top wall 431 and the edges of the first bottom wall 432 are connected to form the heat exchange channel 410. It can be understood that the first top wall 431 and the first bottom wall 432 can be connected by side walls. The dimension of the side walls along the third direction Z can be small, so that the electrical connection portion 400 does not occupy much height space. The inlet and outlet of the heat exchange channel can be connected to the side walls.

[0137] In this embodiment, the heat exchange channel 410 can be manufactured by processes such as die casting or brazing.

[0138] This embodiment makes the structure of the electrical connection more compact and reduces the height of the electrical connection by setting the heat exchange channel inside the electrical connection part, thereby improving the energy density of the battery device while achieving heat exchange and cooling.

[0139] According to some embodiments of this application, the electrical connection portion 400 has a first connection portion 421 and a second connection portion 422. The first connection portion 421 is connected to the electrode terminal 15 of one of two adjacent battery cells 11, and the second connection portion 422 is connected to the electrode terminal 15 of the other of the two adjacent battery cells 11. The first connection portion 421 is formed by connecting a portion of a first top wall 431 and a portion of a first bottom wall 432, and the second connection portion 422 is formed by connecting a portion of a first top wall 431 and a portion of a first bottom wall 432. The heat exchange channel 410 surrounds the first connection portion 421 and the second connection portion 422.

[0140] In this embodiment, as Figure 7 A portion of the first top wall 431 and a portion of the first bottom wall 432 are interconnected along a third direction Z to form a first connecting portion 421. For example, a portion of the first top wall 431 is recessed towards the first bottom wall 432 and connected to the first bottom wall 432 to form the first connecting portion 421. A portion of the first top wall 431 and a portion of the first bottom wall 432 are interconnected along a third direction Z to form a second connecting portion 422. For example, another portion of the first top wall 431 is recessed towards the first bottom wall 432 and connected to the first bottom wall 432 to form the second connecting portion 422.

[0141] The first connecting portion 421 and the second connecting portion 422 can be arranged at intervals along the first direction X. The heat exchange channel 410 can be arranged around the entire first connecting portion 421 and the second connecting portion 422, that is, the first connecting portion and the second connecting portion are located in the area enclosed by the heat exchange channel, so that the first connecting portion and the second connecting portion can be heat exchanged simultaneously.

[0142] In this embodiment, since the first connecting part and the second connecting part are connected to the electrode terminals, they generate a high amount of heat. By arranging the heat exchange channel around the first connecting part and the second connecting part, the heat exchange effect can be effectively improved.

[0143] According to some embodiments of this application, such as Figure 8As shown, the heat exchange channel 410 includes a main heat exchange channel 461 surrounding the first connecting portion 421 and the second connecting portion 422, a first channel 462 connecting the main heat exchange channel 461 and the inlet 411 of the heat exchange channel 410, and a second channel 463 connecting the main heat exchange channel 461 and the outlet 412 of the heat exchange channel 410. The first channel 462 and the second channel 463 are respectively connected to opposite sides of the main heat exchange channel 461.

[0144] Understandable. Figure 8 for Figure 6 The cross-sectional view at point B shows that point B can be a surface formed by the midpoints along the thickness direction (third direction Z) of the electrical connection portion. This surface can be a plane or a curved surface. In this embodiment, the heat exchange channel 410 can have an inlet 411 for the heat exchange medium to flow in and an outlet 412 for the heat exchange medium to flow out. The main heat exchange channel 461 can be an annular channel connected end to end. The internal area of ​​the annular channel (which can be circular, square, etc.) is provided with a first connection portion and a second connection portion. The main heat exchange channel 461 can be mainly used for heat exchange with the first connection portion and the second connection portion.

[0145] The first flow channel 462 can be connected between the inlet 411 and the main heat exchange flow channel 461, and the second flow channel 463 can be connected between the outlet 412 and the main heat exchange flow channel 461. The heat exchange medium entering the heat exchange channel from the inlet can pass through the first flow channel 462, the main heat exchange flow channel 461 and the second flow channel 463 in sequence, and then flow out through the outlet.

[0146] Furthermore, the first flow channel 462 and the second flow channel 463 are respectively connected to opposite sides of the main heat exchange flow channel 461, meaning that the end of the first flow channel 462 connected to the main heat exchange flow channel and the end of the second flow channel 463 connected to the main heat exchange flow channel 461 are respectively located at opposite ends of the main heat exchange flow channel 461. Figure 8 In the middle, these two ends are located at the two ends of the main heat exchange channel along the second direction Y.

[0147] In this embodiment, after the heat exchange medium enters the main heat exchange channel through the first flow channel, since the first connecting part and the second connecting part are located in the area enclosed by the main heat exchange channel, the heat exchange medium can undergo sufficient heat exchange, and then flows out through the second flow channel, thereby improving the heat exchange effect.

[0148] According to some embodiments of this application, such as Figure 9 As shown, the heat exchange channel 410 includes a first sub-channel 413 and a second sub-channel 414 that are isolated from each other. The first sub-channel 413 is arranged around the first connecting part 421, and the second sub-channel 414 is arranged around the second connecting part 422. The first sub-channel 413 and the second sub-channel 414 are arranged in parallel.

[0149] The heat exchange channel 410 may include two independent sub-channels, namely a first sub-channel 413 and a second sub-channel 414. The first sub-channel 413 may be thermally connected to the first connecting portion 421. In this embodiment, the first sub-channel 413 may surround the first connecting portion 421. Similarly, the second sub-channel 414 may be thermally connected to the second connecting portion 422, and the second sub-channel 414 may surround the second connecting portion 422.

[0150] The first sub-channel 413 and the second sub-channel 414 are isolated from each other, meaning they are not directly connected. The first sub-channel 413 and the second sub-channel 414 can be connected in parallel, so that the heat exchange medium can enter the first sub-channel and the second sub-channel in parallel, and then flow out of the first sub-channel and the second sub-channel in parallel.

[0151] It is understood that the first sub-channel 413 has a first inlet for the flow of heat exchange medium and a first outlet for the flow of heat exchange medium, and the second sub-channel 414 has a second inlet for the flow of heat exchange medium and a second outlet for the flow of heat exchange medium. The first inlet of the first sub-channel 413 and the second inlet of the second sub-channel 414 constitute the inlet 411 of the heat exchange channel 410, and the first outlet of the first sub-channel 413 and the second outlet of the second sub-channel 414 constitute the outlet 412 of the heat exchange channel 410.

[0152] In some embodiments, the first sub-channel and the second sub-channel may each include a main heat exchange flow channel, a first flow channel, and a second flow channel. The main heat exchange flow channel of the first sub-channel surrounds the first connecting portion 421. The first flow channel of the first sub-channel connects the main heat exchange flow channel of the first sub-channel and the first inlet of the first sub-channel. The second flow channel of the first sub-channel connects the main heat exchange flow channel of the first sub-channel and the first outlet of the first sub-channel. The main heat exchange flow channel of the second sub-channel surrounds the second connecting portion 422. The first flow channel of the second sub-channel connects the main heat exchange flow channel of the second sub-channel and the second inlet of the second sub-channel. The second flow channel of the second sub-channel connects the main heat exchange flow channel of the second sub-channel and the second outlet of the second sub-channel. Furthermore, the first flow channel and the second flow channel in each sub-channel are respectively connected to opposite sides of the main heat exchange flow channel.

[0153] By setting a first sub-channel and a second sub-channel in the heat exchange channel of the electrical connection, with the first sub-channel surrounding the first connection and the second sub-channel surrounding the second connection, heat exchange can be performed on areas with high heat, improving the heat exchange effect. At the same time, the initial temperature of the heat exchange medium entering the first and second sub-channels can be made approximately the same, improving the temperature uniformity of the first and second connections after heat exchange. This results in a more uniform temperature in the electrical connection and on the top of each battery cell, further improving the heat exchange effect and enhancing the lifespan and safety of the battery device.

[0154] Figure 10 This is a schematic diagram of the parallel structure of various electrical connections provided in some embodiments of this application; Figure 11 for Figure 10 Schematic diagram of the electrical connection part; Figure 12 for Figure 11 A schematic diagram of the heat exchange section. Please refer to... Figures 10 to 12 According to some embodiments of this application, the electrical connection part 400 includes a conductive part 440 and a heat exchange part 450. The conductive part 440 is used to electrically connect the electrode terminals 15 of two adjacent battery cells 11, and the heat exchange part 450 is heat-exchange connected to the side of the conductive part 440 away from the battery cell 11. The heat exchange part 450 has a heat exchange channel 410 inside.

[0155] In this embodiment, the conductive part 440 can be used to realize electrical connection with the electrode terminal 15. For example, the conductive part 440 can be welded to the electrode terminals of two adjacent battery cells. The conductive part 440 can be made of a conductive material, such as copper, aluminum or other metals.

[0156] The heat exchange section 450 can be used to exchange heat with the conductive section, and the heat exchange channel 410 can be disposed inside the heat exchange section 450. The heat exchange section 450 can be connected to the end of the conductive section away from the battery cell 11. The heat exchange section can also be made of conductive materials such as metal.

[0157] In this embodiment, the heat exchange section 450 may include a top plate and a bottom plate. The bottom plate may be attached to the conductive section 440, and a heat exchange channel may be formed between the top plate and the bottom plate. For example, the top plate may protrude in a direction away from the bottom plate to form a heat exchange channel. Alternatively, the heat exchange section 450 may be a solid block structure, and grooves may be cut inside it to form a heat exchange channel.

[0158] It is understood that in this embodiment, the conductive part 440 and the heat exchange part 450 can be two independent components, which are connected to each other to form the electrical connection part 400. The heat exchange part 450 can be directly or indirectly connected to the conductive part 440 from the top, thereby realizing heat exchange.

[0159] In this embodiment, the conductive part 440 can use the common electrical connection structure such as the plate in related technologies, and the heat exchange part 450 is provided to dissipate heat from the conductive part, which can reduce the cost.

[0160] It is understood that since the side of the heat exchange section 450 away from the conductive section 440 (i.e., the heat source) and the positions of the inlet 411 and the outlet 412 have lower temperatures during the heat dissipation process, these positions generate a large temperature difference with the environment inside the battery device. Therefore, in some embodiments, the surface of the heat exchange section 450 away from the conductive section 440 (the surface of the electrical connection part away from the battery cell) and the pipe joints at the inlet and outlet can be provided with a superhydrophobic layer 700.

[0161] In addition, inlet 411 and outlet 412 can be provided in heat exchange section 450, so that the heat exchange channels in the heat exchange sections of each electrical connection section can be connected in parallel.

[0162] In this embodiment, the first connecting portion 421 and the second connecting portion 422 can be located on the conductive portion, and the heat exchange portion 450 can cool it from the top. Additionally, when the heat exchange channel includes a first sub-channel and a second sub-channel, the first sub-channel can be located at the end of the first connecting portion 421 opposite to the battery cell, thereby cooling the first connecting portion. The second sub-channel can be located at the end of the second connecting portion 422 opposite to the battery cell, thereby cooling the second connecting portion.

[0163] Electrical connections between individual battery cells can be achieved through conductive and heat exchange components, while simultaneously improving heat dissipation. Furthermore, the conductive components can utilize common electrical connection structures in related technologies, such as heat exchange plates, and heat dissipation can be achieved through additional heat exchange components, reducing costs and offering good versatility.

[0164] According to some embodiments of this application, the heat exchange portion 450 has a first surface 451 facing the conductive portion, and the conductive portion 440 has a second surface 441 facing the heat exchange portion 450. The shape of the first surface 451 matches the shape of the second surface 441, and the first surface 451 and the second surface 441 are attached together.

[0165] In this embodiment, Figure 11 In the first surface 451, the lower surface of the heat exchange part is used, and the second surface 441 can be the upper surface of the conductive part. The first surface 451 can match the shape of the second surface 441 and be connected to it. That is, the shape and size of the first surface 451 can be consistent with the shape and size of the second surface 441. When the two are attached, they can completely overlap each other.

[0166] In this embodiment, by matching the shapes of the first and second surfaces and fitting them together, the heat exchange part can be completely attached to the conductive part, increasing the contact area between them and thus improving the heat exchange effect.

[0167] Of course, it is understood that in other embodiments, such as Figure 11 The heat exchange part 450 can be attached to at least the first and second connecting parts of the conductive part.

[0168] According to some embodiments of this application, the conductive part 440 is welded to the heat exchange part 450, and a thermally conductive medium is filled between the conductive part 440 and the heat exchange part 450; or, the conductive part 440 is bonded to the heat exchange part 450 by a thermally conductive adhesive part.

[0169] This embodiment provides a connection method between the conductive part and the heat exchange part 450. For example, after the conductive part 440 is welded to the electrode terminal, the heat exchange part 450 can be welded to the top of the conductive part 440. To improve the heat exchange capacity between the conductive part and the heat exchange part, a heat-conducting medium can be filled between them. The heat-conducting medium can be a material with excellent thermal conductivity, such as high-temperature resistant heat-conducting oil. The heat-conducting medium can fill the gap between the conductive part and the heat exchange part, thereby improving the heat exchange capacity between them.

[0170] In other embodiments, the heat exchange part can also be directly bonded to the conductive part via a thermally conductive adhesive part. This thermally conductive adhesive part not only connects the two parts but also improves their heat exchange capacity. The thermally conductive adhesive part can be made of thermally conductive adhesives such as silicone resin, polyurethane, or epoxy resin.

[0171] In this embodiment, the connection between the heat exchange section and the conductive section can be achieved through the above two methods, and the thermal conductivity between the two can be improved, which is beneficial to improving the heat dissipation effect.

[0172] According to some embodiments of this application, please refer to Figure 12 The conductive part has a first connecting part 421 and a second connecting part 422 arranged along a first direction X. The first connecting part 421 is connected to the electrode terminal 15 of one of two adjacent battery cells 11, and the second connecting part 422 is connected to the electrode terminal 15 of the other of the two adjacent battery cells 11. The heat exchange channel 410 includes a plurality of sub-channels 415 connected sequentially along a second direction. Each of the plurality of sub-channels 415 extends along the first direction X, and the flow direction of the heat exchange medium in two adjacent sub-channels 415 is opposite. At least two adjacent sub-channels 415 can flow through the region where the first connecting part 421 is located and the region where the second connecting part 422 is located, wherein the first direction X intersects the second direction Y.

[0173] In this embodiment, the heat exchange channel 410 may include a plurality of sub-channels 415, each sub-channel 415 may extend along a first direction, and the plurality of sub-channels 415 may be arranged along a second direction Y. Figure 12 In this configuration, two adjacent sub-channels 415 can be connected by a shorter channel extending along the second direction. The first and second directions can be intersecting, for example, perpendicular to each other.

[0174] It is understandable that multiple sub-channels 415 can be connected in a curved shape, so that the flow direction of the heat exchange medium between two adjacent sub-channels 415 is opposite, for example, Figure 12 The heat exchange medium in the rightmost sub-channel can flow from the lower left to the upper right, while the heat exchange medium in the second sub-channel from the right can flow from the upper right to the lower left, and so on. The heat exchange medium can flow through each sub-channel in a tortuous manner.

[0175] The position of the first connection part 421 and the second connection part 422 at the bottom of the heat exchange section is shown in the figure with dashed boxes. It can be understood that at least two adjacent sub-channels can pass through the positions of these two dashed boxes respectively.

[0176] Understandable, with Figure 12 Taking the two sub-channels on the right as an example, passing through the area indicated by the dashed box, the heat exchange medium inside the rightmost sub-channel can sequentially pass through the areas of the first connecting part 421 and the second connecting part 422, thereby cooling the first connecting part 421 and the second connecting part 422 in sequence. Then, the heat exchange medium can enter the second sub-channel from the right. At this time, the heat exchange medium can sequentially pass through the areas of the second connecting part 422 and the first connecting part 421, thereby cooling the second connecting part 422 and the first connecting part 421 in sequence. This allows the cooler heat exchange medium to sequentially pass through the first connecting part, the second connecting part, the second connecting part, the first connecting part, and so on, so that the areas of priority heat exchange in each sub-channel alternate. This results in a more uniform temperature in the first connecting part and the second connecting part after heat exchange, good heat dissipation effect, and uniform heat dissipation.

[0177] Of course, in other embodiments, the area where the first connecting part and the second connecting part are located can have more sub-channels passing through, further improving the temperature uniformity and cooling effect.

[0178] In this embodiment, by setting multiple sub-channels, the cooler heat exchange medium can pass through the first connecting part, the second connecting part, the second connecting part, the first connecting part, and so on in sequence. This allows the areas where heat exchange is preferentially carried out in each sub-channel to change alternately, making the temperature of the first and second connecting parts more uniform after heat exchange, resulting in good heat dissipation and achieving uniform heat dissipation.

[0179] This application provides an electrical device, which includes the battery device 100 in the above embodiments, and the battery device 100 is used to provide electrical energy.

[0180] Electrical devices include vehicles (such as cars, electric vehicles, ships, spacecraft, etc.), display devices (such as mobile phones, tablets, laptops, etc.), electric toys, power tools, etc.

[0181] It is understood that the electrical device provided in this application, by using any of the aforementioned battery devices 100, has all the beneficial effects of the aforementioned battery devices 100, which will not be elaborated here.

[0182] This application provides an energy storage device, which includes the battery device 100 in the above embodiments, and the battery device 100 is used to store electrical energy.

[0183] Energy storage devices can include, but are not limited to, centralized energy storage devices (such as containerized energy storage devices), distributed energy storage devices, mobile energy storage devices, wearable energy storage devices, and so on.

[0184] It is understood that the energy storage device provided in this application, by using any of the aforementioned battery devices 100, has all the beneficial effects of the aforementioned battery devices 100, which will not be elaborated here.

[0185] Please refer to Figures 4 to 8 This application provides a battery device 100, including: a housing 20 and at least one battery cell assembly 10. The battery cell assembly 10 is housed in the housing 20. The battery cell assembly 10 includes a plurality of electrical connection portions 400 and a plurality of battery cells 11 arranged along a first direction X. The electrical connection portions 400 are used to electrically connect the electrode terminals 15 of two adjacent battery cells 11, and the electrical connection portions 400 are provided with heat exchange channels 410. The heat exchange channels 410 of each electrical connection portion 400 are arranged in parallel so that the heat exchange medium can enter each heat exchange channel 410 in parallel and flow out of each heat exchange channel 410 in parallel. The heat exchange medium is an insulating heat exchange medium.

[0186] Because the electrical connection section is equipped with a heat exchange channel, the high heat generated at the connection between the electrical connection section and the electrode terminals during the charging and discharging of the battery cell can be discharged through the heat exchange medium in the heat exchange channel, thereby achieving rapid cooling of the electrical connection section and heat dissipation at the top of the battery cell. This results in better heat dissipation and improves the lifespan and safety of the battery device. Furthermore, by arranging the heat exchange channels of each electrical connection section in parallel within the battery cell assembly, the heat exchange medium can be evenly and concurrently distributed to each electrical connection section. This ensures that the initial temperature of the heat exchange medium entering each electrical connection section is approximately the same. Compared to the cooling method in related technologies where the coolant sequentially passes through each electrode plate, this embodiment improves the uniformity of the initial temperature of the heat exchange medium entering each electrical connection section. This results in a more uniform temperature in the electrical connection section and at the top of each battery cell after heat exchange, further improving the heat exchange effect and enhancing the lifespan and safety of the battery device.

[0187] 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 in that, include: Box; At least one battery cell assembly is housed in the housing. The battery cell assembly includes multiple electrical connection portions and multiple battery cells arranged along a first direction. The electrical connection portions are used to electrically connect the electrode terminals of two adjacent battery cells, and the electrical connection portions are provided with heat exchange channels. The heat exchange channels of each electrical connection portion are arranged in parallel so that the heat exchange medium can enter each heat exchange channel in parallel and flow out of each heat exchange channel in parallel. The heat exchange medium is an insulating heat exchange medium.

2. The battery device according to claim 1, characterized in that, The battery device also includes a main input line and a main output line; The heat exchange channels have inlets and outlets. The inlets of each heat exchange channel are connected to the main input pipeline, and the outlets of each heat exchange channel are connected to the main output pipeline, so that the heat exchange medium in the main input pipeline can enter each heat exchange channel in parallel through each inlet and flow out of each heat exchange channel in parallel from each outlet.

3. The battery device according to claim 1, characterized in that, An electrical connection portion is connected to each of the two electrode terminals of the battery cell, and in the electrical connection portion connected to one of the electrode terminals, the inlet and outlet of the heat exchange channel are located on the side of the electrical connection portion away from the other electrode terminal.

4. The battery device according to claim 1, characterized in that, The electrical connection portion has a first connection portion and a second connection portion. The first connection portion is connected to the electrode terminal of one of the two adjacent battery cells, and the second connection portion is connected to the electrode terminal of the other of the two adjacent battery cells. The heat exchange channel includes a first sub-channel and a second sub-channel that are isolated from each other. The first sub-channel is heat-exchange connected to the first connecting part, and the second sub-channel is heat-exchange connected to the second connecting part. The first sub-channel and the second sub-channel are arranged in parallel.

5. The battery device according to claim 1, characterized in that, The surface of the electrical connection portion facing away from the battery cell is provided with a superhydrophobic layer to suppress the accumulation of condensate.

6. The battery device according to any one of claims 1-3 and 5, characterized in that, The electrical connection includes a first top wall and a first bottom wall disposed opposite to the first top wall, the edges of the first top wall and the edges of the first bottom wall being connected to form the heat exchange channel.

7. The battery device according to claim 6, characterized in that, The electrical connection portion has a first connection portion and a second connection portion. The first connection portion is connected to the electrode terminal of one of the two adjacent battery cells, and the second connection portion is connected to the electrode terminal of the other of the two adjacent battery cells. The first connecting portion is formed by connecting a portion of the first top wall and a portion of the first bottom wall, and the second connecting portion is formed by connecting a portion of the first top wall and a portion of the first bottom wall, and the heat exchange channel surrounds the first connecting portion and the second connecting portion.

8. The battery device according to claim 7, characterized in that, The heat exchange channel includes a main heat exchange channel surrounding the first connecting portion and the second connecting portion, a first channel connecting the main heat exchange channel and the inlet of the heat exchange channel, and a second channel connecting the main heat exchange channel and the outlet of the heat exchange channel; the first channel and the second channel are respectively connected to opposite sides of the main heat exchange channel.

9. The battery device according to claim 7, characterized in that, The heat exchange channel includes a first sub-channel and a second sub-channel that are isolated from each other. The first sub-channel is arranged around the first connecting part, and the second sub-channel is arranged around the second connecting part. The first sub-channel and the second sub-channel are arranged in parallel.

10. The battery device according to any one of claims 1-5, characterized in that, The electrical connection portion includes a conductive portion and a heat exchange portion. The conductive portion is used to electrically connect the electrode terminals of two adjacent battery cells. The heat exchange portion is heat-exchange connected to the side of the conductive portion away from the battery cell. The heat exchange portion has the heat exchange channel inside.

11. The battery device according to claim 10, characterized in that, The heat exchange section has a first surface facing the conductive section, and the conductive section has a second surface facing the heat exchange section. The shape of the first surface matches the shape of the second surface, and the first surface and the second surface are in close contact.

12. The battery device according to claim 10, characterized in that, The conductive part is welded to the heat exchange part, and a thermally conductive medium is filled between the conductive part and the heat exchange part; or, the conductive part is bonded to the heat exchange part by a thermally conductive adhesive part.

13. The battery device according to claim 10, characterized in that, The conductive part has a first connecting part and a second connecting part arranged along the first direction. The first connecting part is connected to the electrode terminal of one of the two adjacent battery cells, and the second connecting part is connected to the electrode terminal of the other of the two adjacent battery cells. The heat exchange channel includes a plurality of sub-channels connected sequentially along a second direction. Each of the plurality of sub-channels extends along the first direction, and the flow directions of the heat exchange medium in two adjacent sub-channels are opposite. At least two adjacent sub-channels have heat exchange medium that can flow through the region where the first connection is located and the region where the second connection is located, wherein the first direction intersects the second direction.

14. The battery device according to any one of claims 1-5, characterized in that, The housing is equipped with a heat exchanger, and the battery cell assembly is heat-exchange connected to the heat exchanger, with the heat exchanger located on the side of the battery cell away from the electrical connection portion.

15. An electrical appliance, characterized in that, The electrical device includes a battery device as described in any one of claims 1-14, the battery device being used to provide electrical energy.

16. An energy storage device, characterized in that, The energy storage device includes a battery device as described in any one of claims 1-14, the battery device being used to store electrical energy.

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