Battery device and electric equipment

Abstract

The utility model relates to a battery device and electric equipment, the battery device comprises a box body, a battery monomer and a heat exchange mechanism, the heat exchange mechanism is in heat conduction connection with the battery monomer, the heat exchange mechanism comprises a plurality of heat exchange plates and current collectors arranged at at least one end of each heat exchange plate, and the plurality of heat exchange plates are sequentially arranged at intervals along the thickness direction of the heat exchange plates; the inner cavities of the two adjacent current collectors are communicated with each other along the thickness direction; wherein the plurality of current collectors comprise a first current collector and a second current collector which are adjacent to each other, a liquid outlet connecting part is convexly arranged on one side, close to the second current collector, of the first current collector, a liquid inlet connecting part is convexly arranged on one side, close to the first current collector, of the second current collector, and the liquid outlet connecting part is directly connected with the liquid inlet connecting part; one of the liquid outlet connecting part and the liquid inlet connecting part comprises a containing connector, the other one comprises a butt joint, a sealing piece is annularly arranged on the periphery of the butt joint, an annular groove is formed in the periphery of the butt joint, and part of the sealing piece is embedded in the annular groove. The reliability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery devices and electrical equipment. Background Technology

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] Battery devices generate a lot of heat during use. They are usually equipped with heat exchange mechanisms to dissipate heat and cool down. However, the reliability of existing heat exchange mechanisms is low, which affects the heat dissipation performance of the battery device. Utility Model Content

[0004] In view of the above problems, this application provides a battery device and an electrical appliance, which aims to improve the heat dissipation performance of the battery device.

[0005] In a first aspect, this application proposes a battery device, including a housing, a battery cell, and a heat exchange mechanism. The housing has a receiving cavity; the battery cell is disposed within the receiving cavity; the heat exchange mechanism is disposed within the receiving cavity and is thermally connected to the battery cell. The heat exchange mechanism includes multiple heat exchange plates and current collectors disposed at at least one end of each heat exchange plate. The multiple heat exchange plates are arranged sequentially at intervals along the thickness direction of the heat exchange plates, and the inner cavities of two adjacent current collectors are interconnected along the thickness direction. The multiple current collectors include adjacent first current collectors and second current collectors. The first current collector has a liquid outlet connection portion protruding on the side near the second current collector, and the second current collector has a liquid inlet connection portion protruding on the side near the first current collector. The liquid outlet connection portion and the liquid inlet connection portion are directly connected. One of the liquid outlet connection portion and the liquid inlet connection portion includes a receiving connector, and the other includes a mating connector. A sealing element is provided around the outer periphery of the mating connector, and an annular groove is formed on the outer periphery of the mating connector. A portion of the sealing element is embedded in the annular groove.

[0006] In the embodiment of this application, the first and second current collectors are directly connected via protruding outlet and inlet connections, eliminating the need for additional connecting pipes. This reduces the risk of leakage due to poor sealing of the connecting pipes, decreases the number of parts in the heat exchange mechanism, avoids error accumulation caused by multi-stage connections, facilitates weight and cost reduction, and improves assembly efficiency. The seal is partially embedded in an annular groove, effectively preventing lateral displacement of the seal due to vibration or temperature changes. The mechanical locking between the annular groove and the seal enhances the stability of the sealing structure, ensuring complete contact of the sealing surface even under thermal expansion and contraction or mechanical vibration conditions, reducing the risk of coolant leakage, and thus improving the reliability of the heat exchange mechanism and battery device.

[0007] In some embodiments, the liquid outlet connection is inserted into the liquid inlet connection.

[0008] In these embodiments, the liquid outlet connection and the liquid inlet connection are tightly connected by plugging. The mechanical interlock formed by the plugging structure enhances the stability of the connection and reduces the risk of loosening caused by vibration and external impact.

[0009] In some embodiments, one of the liquid outlet connection and the liquid inlet connection includes a receiving connector and the other includes a mating connector, the receiving connector enclosing a receiving space, and at least a portion of the mating connector being located within the receiving space.

[0010] In these embodiments, this configuration simplifies the connection structure between the collectors, improves assembly efficiency, and reduces the risk of coolant leakage by directly forming flow channel connections through structural nesting.

[0011] In some embodiments, along the thickness direction, the distance between the first collector and the second collector is D1, the protrusion length of the liquid outlet connection relative to the first collector is D2, the protrusion length of the liquid inlet connection relative to the second collector is D3, and D2+D3>D1; wherein, 0.5*D1≤D2≤D1; and / or, 0.5*D1≤D3≤D1.

[0012] In these embodiments, this configuration reduces the risk of assembly difficulties due to excessively short protrusion length, while also reducing the risk of structural interference due to excessively long protrusion. This improves the stability and sealing reliability of the plug-in structure, effectively mitigating potential sealing failures or structural deformations during assembly, thereby ensuring the stability of coolant flow and heat exchange efficiency.

[0013] In some embodiments, D2 ≥ 0.7 * D1, and D3 ≥ 0.7 * D1.

[0014] In these embodiments, the liquid outlet connection can form a deeper insertion depth when it is inserted into the liquid inlet connection, thereby reducing the risk of connection gaps caused by processing errors or assembly deviations, and enhancing vibration resistance and sealing reliability.

[0015] In some embodiments, the liquid outlet connection and the liquid inlet connection are sealed together.

[0016] These embodiments effectively mitigate the potential coolant leakage problem that may occur when the outlet and inlet connections are directly connected. The sealed connection design ensures the airtightness of the heat exchange mechanism's internal cavity, preventing coolant leakage from the connection point, improving the reliability of the heat exchange mechanism, reducing the risk of coolant leakage, and thus ensuring the safety of the battery device.

[0017] In some embodiments, the receiving joint encloses a receiving space, and at least a portion of the mating joint is located within the receiving space; wherein the sealing element abuts against the outer wall surface of the mating joint and the inner wall surface of the receiving joint, respectively.

[0018] In these embodiments, a seal is provided on the outer periphery of the mating joint, utilizing the elastic deformation characteristics of the seal to effectively fill the assembly gap between the joints. The seal abuts against the inner wall of the receiving joint and the outer wall of the mating joint, respectively. The two work together to improve the reliability and durability of the sealed connection, mitigate the sealing failure problem that may occur between adjacent collectors under vibration or thermal expansion and contraction conditions, and improve the reliability of the heat exchange mechanism.

[0019] In some embodiments, a plurality of annular grooves are arranged sequentially at intervals along the axis of the mating joint, and a plurality of seals are arranged in one-to-one correspondence with the plurality of annular grooves.

[0020] In these embodiments, the pressure concentration problem caused by insufficient contact area of ​​single-point sealing is improved, the sealing effect of multiple seals is better, and the fatigue resistance and sealing stability of the connection interface are enhanced.

[0021] In some embodiments, the first current collector has a liquid inlet structure protruding on the side opposite to the second current collector, and the second current collector has a liquid outlet structure protruding on the side opposite to the first current collector.

[0022] In these embodiments, the arrangement of the liquid inlet and liquid outlet structures facilitates the flow of the heat exchange medium and simplifies the assembly of the heat exchange mechanism.

[0023] In some embodiments, the heat exchange mechanism further includes an outlet pipe and an inlet pipe; wherein the outlet pipe is plugged into an outlet structure, and / or the inlet pipe is plugged into an inlet structure.

[0024] In these embodiments, the direct plug-in connection between the pipeline and the inlet or outlet structure eliminates the need for additional quick-connect fittings, which helps to reduce the weight of the heat exchange mechanism and the manufacturing cost of the pipeline.

[0025] Secondly, this application provides an electrical device including a battery device according to any of the first aspects of the above embodiments, the battery device being used to provide electrical energy.

[0026] 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

[0027] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the structure of a battery module provided in one embodiment of this application;

[0031] Figure 4 This is a schematic diagram of the exploded structure of a single battery cell provided in an embodiment of this application;

[0032] Figure 5 This is a three-dimensional structural diagram of a battery cell and a heat exchange mechanism provided in an embodiment of this application;

[0033] Figure 6 yes Figure 5 Enlarged view of section A;

[0034] Figure 7 This is a schematic diagram of the structure of the first current collector and the second current collector before assembly, according to an embodiment of this application;

[0035] Figure 8 This is a schematic diagram of the assembled structure of the first current collector and the second current collector according to an embodiment of this application;

[0036] Figure 9 This is a schematic diagram of the assembled structure of the first current collector and the second current collector according to another embodiment of this application;

[0037] Figure 10 This is a three-dimensional structural schematic diagram of a heat exchange mechanism provided in an embodiment of this application;

[0038] Figure 11 yes Figure 10 Enlarged view of section B.

[0039] The accompanying drawings may not be drawn to scale.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1000, vehicles;

[0042] 100. Battery assembly; 110. Controller; 120. Motor;

[0043] 200. Battery module;

[0044] 300. Enclosure; 301. First enclosure; 302. Second enclosure;

[0045] 10. Battery cell; 11. Housing; 12. Electrode assembly; 13. End cap assembly;

[0046] 4. Heat exchange mechanism; 41. Heat exchange plate; 42. Current collector; 421. First current collector; 421a. Liquid outlet connection; 421b. Liquid inlet structure; 422. Second current collector; 422a. Liquid inlet connection; 422b. Liquid outlet structure. 43. Receiving joint; 431. Receiving space; 44. Butt joint; 441. Seal; 442. Annular groove. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0049] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] 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 existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0053] In this application, "multiple" means two or more (including two).

[0054] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0055] With the rapid development of new energy vehicles and energy storage technologies, the energy density and charging / discharging power of power battery packs are constantly increasing, leading to a sharp increase in the heat generated. An efficient and reliable thermal management system is crucial for ensuring the battery pack operates within a suitable temperature range, maintaining temperature uniformity between cells, preventing thermal runaway, and extending its service life. Among various heat dissipation solutions, liquid cooling plates have become the mainstream cooling method for large-capacity battery packs due to their excellent heat dissipation capabilities. Typically, liquid cooling plates are installed at the bottom of the battery module or between cells, carrying away heat through coolant in internal channels.

[0056] In related technologies, the heat exchange and cooling mechanism of a battery device involves setting up a current collector and a profile cold plate inside the battery device. The profile cold plate is directly embedded in the large surface between the battery cells, forming a "cell-cooling plate-cell" sandwich structure. However, this structure still has shortcomings in meeting the core requirements of large battery devices for thermal management systems, such as high safety, high reliability, vibration resistance and fatigue resistance, long-term stable contact at the interface, and lightweight design. This results in low reliability of the heat exchange and cooling mechanism, affecting the reliability and heat dissipation performance of the battery device.

[0057] Based on the above problems, this application provides a battery device in which the first current collector and the second current collector are directly connected through a protruding liquid outlet connection and a liquid inlet connection, eliminating the need for an additional connecting pipe between them. This reduces the risk of leakage due to poor sealing of the connecting pipe, reduces the number of parts in the heat exchange mechanism, avoids the accumulation of errors caused by multi-stage connections, helps to reduce weight and cost, improves assembly efficiency, and also improves the reliability of the heat exchange mechanism and the battery device.

[0058] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical equipment using battery devices.

[0059] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0060] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or battery pack. A battery device generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0061] In some embodiments, the battery device can be used in an energy storage device. The energy storage device may include an energy storage container, an energy storage cabinet, etc., and the battery device is used to store or provide electrical energy.

[0062] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0063] Please refer to Figure 1 , Figure 1This 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 110 and a motor 120. The controller 110 is used to control the battery to supply power to the motor 120, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0064] 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.

[0065] Figure 2 A schematic diagram of the structure of a battery device according to an embodiment of this application is shown.

[0066] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 10, which are connected in series, parallel, or mixed connections via a busbar.

[0067] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 10.

[0068] As an example, the battery cell assembly can be a battery module 200, which is formed by arranging and fixing multiple battery cells 10 into a single module. As an example, the battery module 200 can be formed by bundling multiple battery cells 10 together with cable ties.

[0069] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 300 and one or more battery cell assemblies housed in the housing 300.

[0070] As an example, the battery cell assembly can be a battery module 200, which can be housed in the housing 300 by fixing the battery module 200 in the housing 300.

[0071] As an example, the battery cell assembly can also be housed in the housing 300 by directly fixing multiple battery cells 10 to the housing 300.

[0072] As an example, the housing 300 may include a first housing 301 and a second housing 302. The first housing 301 and the second housing 302 are fastened together to form a closed space inside the housing 300 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 301 may be a top cover or a bottom plate.

[0073] As an example, if the first housing 301 is located below the second housing 302, it can also be referred to as the lower housing, and the second housing 302 is referred to as the upper housing. The lower housing may include a bottom support plate, and the upper housing may include a top cover. The housing 300 also includes a frame connecting the bottom support plate and the top cover.

[0074] In some embodiments, the housing 300 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 300 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 300 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0075] Figure 3 A schematic diagram of the structure of a battery module according to an embodiment of this application is shown.

[0076] In some embodiments, such as Figure 2 and Figure 3 As shown, there are multiple battery cells 10. These multiple battery cells 10 are first connected in series, parallel, or in a mixed manner to form a battery module 200. The multiple battery modules 200 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing 300.

[0077] Multiple battery cells 10 in the battery module 200 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 10 in the battery module 200.

[0078] In this application, the battery cell 10 may include lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application are not limited to this.

[0079] Figure 4 An exploded structural diagram of a battery cell according to an embodiment of this application is shown.

[0080] A battery cell 10 refers to the smallest unit that makes up a battery. A battery cell 10 includes a housing 11, an electrode assembly 12, and an end cap assembly 13.

[0081] Electrode assembly 12 is the component in the battery cell 10 where electrochemical reactions occur. The housing 11 may contain one or more electrode assemblies 12. The electrode assembly 12 is mainly formed by winding or stacking electrode sheets, which are divided into positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs can be located together at one end of the electrode body or separately at both ends of the electrode body. During the charging and discharging process of the battery cell 10, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0082] As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0083] The housing 11 and the end cap assembly 13 can be independent components. One or more openings can be provided on the housing 11, and one or more end cap assemblies 13 can close the openings to form the internal environment of the battery cell 10. Optionally, the end cap assembly 13 and the housing 11 can be integrated. Optionally, the end cap assembly 13 and the housing 11 can form a common connection surface before other components are inserted into the housing, and the end cap assembly 13 closes the housing 11 when it is necessary to encapsulate the interior of the housing 11.

[0084] In some embodiments, the end cap assembly 13 is provided with at least one electrode terminal, which is electrically connected to the electrode tab. The electrode terminal can be directly connected to the electrode tab or indirectly connected to the electrode tab through a current collector. In addition, the electrode terminal can be provided not only on the end cap assembly 13, but also on the housing 11.

[0085] Reference Figures 2 to 8 , Figure 5 A three-dimensional structural diagram of a battery cell and a heat exchange mechanism provided in an embodiment of this application is shown. Figure 6 It shows Figure 5 Enlarged view of section A.

[0086] In a first aspect, this application proposes a battery device 100, which includes a housing 300, a battery cell 10, and a heat exchange mechanism 4. The housing 300 has a receiving cavity; the battery cell 10 is disposed within the receiving cavity; the heat exchange mechanism 4 is disposed within the receiving cavity and is thermally connected to the battery cell 10. The heat exchange mechanism 4 includes a plurality of heat exchange plates 41 and a current collector 42 disposed at at least one end of each heat exchange plate 41. The plurality of heat exchange plates 41 are arranged sequentially at intervals along the thickness direction of the heat exchange plates 41, and the inner cavities of two adjacent current collectors 42 are interconnected along the thickness direction; wherein, the plurality of current collectors 42 include adjacent first current collectors 421. The first collector 421 has a protruding liquid outlet connection 421a on the side near the second collector 422, and the second collector 422 has a protruding liquid inlet connection 422a on the side near the first collector 421. The liquid outlet connection 421a and the liquid inlet connection 422a are directly connected. One of the liquid outlet connection 421a and the liquid inlet connection 422a includes a receiving connector 43, and the other includes a mating connector 44. The outer periphery of the mating connector 44 is provided with a sealing element 441, and an annular groove 442 is formed on the outer periphery of the mating connector 44. A portion of the sealing element 441 is embedded in the annular groove 442.

[0087] The annular groove 442 can extend continuously along the circumference of the mating joint 44 to form a closed-loop structure. Its cross-sectional shape can be rectangular, trapezoidal, or semi-circular. The depth of the annular groove is designed to be less than the cross-sectional diameter of the sealing ring to ensure that the sealing ring is properly compressed during connection. For example, the depth is 30%-50% of the diameter of the seal 441. The part of the seal 441 that is embedded forms an interference fit with the annular groove 442, while the unembedded part remains free to maintain its elastic deformation capability.

[0088] Under vibration conditions, the sidewall of the annular groove 442 blocks the displacement of the seal 441 along the axial direction, while the bottom support surface of the groove is used to prevent the seal 441 from circumferentially sliding due to inertial forces.

[0089] The outer peripheral surface of the mating joint 44 can be machined with an annular groove 442 with a U-shaped cross-section. The sealing element 441 is made of elastic rubber material. The bottom of the sealing element 441 is pressed into the annular groove 442, and the top extends beyond the opening of the annular groove 442. When the mating joint 44 is inserted into the receiving space 431 of the receiving joint 43, the top of the sealing element 441 is compressed by the inner wall of the receiving joint 43, forming a radial preload.

[0090] The main function of the heat exchange mechanism 4 is to manage the heating and cooling of the battery device 100. It can remove the heat generated by the battery through heat conduction, heat convection, and heat radiation, ensuring that the battery operates within a suitable temperature range, thereby extending the battery's lifespan and improving its performance. This embodiment uses a liquid-cooled heat exchange mechanism 4 as an example. The liquid-cooled heat exchange mechanism 4 removes heat through the circulation of coolant within the heat exchange pipes. This heat exchange method has high heat dissipation efficiency and good temperature uniformity.

[0091] The heat exchange mechanism 4 is thermally connected to the battery cell 10. This can be understood as follows: the heat exchange mechanism 4 is directly attached to or abuts against the battery cell 10; or the heat exchange mechanism 4 and the battery cell 10 are spaced apart, and the heat exchange mechanism 4 is connected to the battery cell 10 through a heat-conducting medium, which can be air, metal, or thermally conductive adhesive, etc. The heat exchange medium is stored and circulated within the heat exchange pipe, and the heat exchange mechanism 4 is mainly responsible for transferring heat from the battery cell 10 to the heat exchange medium. Optionally, the heat exchange mechanism 4 can have thermally conductive contact with the outer surface of the battery cell 10.

[0092] For example, the heat exchange plate 41 can be a harmonica tube plate with multiple flow channels formed inside, at least some of which communicate with the inner cavity of the current collector 42 to realize the flow of the heat exchange medium. The heat exchange plate 41 is thermally connected to the battery cell 10. For example, the heat exchange plate 41 is in thermal contact with the bottom of the battery cell 10. Another example is that the heat exchange plate 41 is in thermal contact with a large surface area of ​​the side surface of the battery cell 10. In this embodiment, one heat exchange plate 41 can be sandwiched between two adjacent battery cells 10.

[0093] The heat exchange plate 41 has a length direction (e.g.) Figure 4 (as shown in the X-axis direction), width direction (as shown in the X-axis direction) Figure 4 As shown in the Y-axis direction), and the thickness direction (as shown in the figure). Figure 4 (As shown in the Z-axis direction), where the length, thickness, and height directions can be perpendicular to each other.

[0094] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve a cooling effect on the battery cell 10, such as being gaseous or liquid. This embodiment uses a coolant as an example for description.

[0095] The heat collector 42 is a structure that connects the heat exchange plates 41 and guides the heat exchange medium, used to connect the flow channels of multiple heat exchange plates 41 in series to form a continuous cooling circuit. Optionally, each heat exchange plate 41 may be provided with two heat collectors 42, which are respectively located at both ends of the length direction of the heat exchange plate 41. The heat collector 42 includes a shell with an inner cavity inside. The shell is open on one side facing the heat exchange plate 41 for connecting one end of the heat exchange element. One end port of the flow channel inside the heat exchange plate 41 communicates with the inner cavity of the heat collector 42.

[0096] Optionally, the two collectors 42 corresponding to the same heat exchange plate 41 are the same size and shape, and are symmetrically arranged at both ends of the heat exchange plate 41 along its length.

[0097] The liquid outlet connection 421a refers to the fluid outlet structure extending from the first collector 421. It can be designed with a cylindrical or conical boss and forms a sealed connection with the liquid inlet connection 422a by plugging or welding. The liquid inlet connection 422a refers to the fluid inlet structure extending from the second collector 422. Specifically, it matches the shape of the liquid outlet connection 421a and achieves communication between the inner cavities of adjacent collectors 42 by direct docking, thus simplifying the assembly process.

[0098] The liquid outlet connection 421a can be integrated with the first current collector 421 or the two can be fixed by welding or other connection methods. The other side of the first current collector 421 can have a liquid inlet structure 421b that is the same as the liquid inlet connection 422a. Similarly, the liquid inlet connection 422a can be integrated with the second current collector 422 or the two can be fixed by welding or other connection methods. The other side of the second current collector 422 can have a liquid inlet structure 421b that is the same as the liquid outlet connection 421a, so as to realize the sequential connection and assembly of multiple current collectors 42.

[0099] The materials of each component, including but not limited to heat exchange plate 41, collector 42, liquid outlet connection 421a and liquid inlet connection 422a, are metal, non-metal, or a combination of metal and non-metal.

[0100] In this embodiment, the battery device 100 includes a housing 300, a battery cell 10, and a heat exchange mechanism 4. The first current collector 421 and the second current collector 422 are directly connected via protruding outlet connection 421a and inlet connection 422a, eliminating the need for additional connecting pipes. This reduces the risk of leakage due to poor sealing of the connecting pipes, reduces the number of parts in the heat exchange mechanism 4, avoids error accumulation caused by multi-stage connections, facilitates weight and cost reduction, and improves the assembly efficiency of the battery device 100. A portion of the seal 441 is embedded in the annular groove 442. This design effectively prevents lateral displacement of the seal 441 caused by vibration or temperature changes. The mechanical locking between the annular groove 442 and the seal 441 improves the stability of the sealing structure, ensuring complete contact of the sealing surface under thermal expansion and contraction or mechanical vibration conditions, thus reducing the risk of coolant leakage. This improves the reliability of the heat exchange mechanism 4 and the battery device 100.

[0101] In related technologies, the connection structure between the current collectors 42 is complex and requires high installation precision. When the water nozzles of the current collectors 42 are poorly machined or the coaxiality of the connecting pipes is not well controlled, a large number of harmonica tubes are connected to the connecting pipes, which can easily lead to the accumulation of errors and have a significant impact on the sealing performance of the entire heat exchange system. This can easily lead to loosening or coolant leakage during long-term use, affecting heat exchange efficiency and battery reliability. This embodiment of the application effectively reduces the use of connecting pipes by providing directly connected outlet connection parts 421a and inlet connection parts 422a on adjacent current collectors 42, thereby reducing the risk of accumulated assembly errors and improving the heat exchange efficiency and reliability of the battery device 100.

[0102] The outlet connection 421a and the inlet connection 422a are directly connected, forming a self-positioning structure, eliminating the need for traditional connecting pipe structures. When the heat exchange mechanism 4 is working, coolant flows out from the outlet connection 421a of the first collector 421 and directly enters the inlet connection 422a of the second collector 422, enabling coolant flow between adjacent collectors 42. The protruding connection structure facilitates direct docking between the two, reducing the number of independent connecting pipe parts and avoiding the error accumulation problem caused by multi-stage connections.

[0103] Combined with reference Figure 7 and Figure 8 In some embodiments, the liquid outlet connection 421a is plugged into the liquid inlet connection 422a.

[0104] The plug-in structure achieves connection through physical nesting. The liquid outlet connection 421a and the liquid inlet connection 422a are designed with complementary shapes, such as circular or rectangular cross-sections. The liquid outlet connection 421a can be designed as a cylindrical protruding structure, while the liquid inlet connection 422a is designed as a matching cylindrical groove structure.

[0105] Optionally, the outer diameter of the liquid outlet connection 421a is slightly smaller than the inner diameter of the liquid inlet connection 422a, so that it can extend into the liquid inlet connection 422a.

[0106] Optionally, the insertion depth of the liquid outlet connection 421a and the liquid inlet connection 422a can be designed to be 60%-90% of the length of the liquid outlet connection 421a to ensure sufficient overlap area. An interference fit can also be used at the insertion point to achieve a sealing design between the liquid outlet connection 421a and the liquid inlet connection 422a.

[0107] In these embodiments, the liquid outlet connection 421a and the liquid inlet connection 422a are tightly connected by plugging. The mechanical interlock formed by the plugging structure enhances the stability of the connection and reduces the risk of loosening of the connection caused by vibration and external impact.

[0108] In addition, this design eliminates the need for additional connecting pipes, simplifies the assembly process, improves production efficiency, enhances the reliability of the heat exchange mechanism 4 under complex operating conditions, and reduces the risk of coolant leakage.

[0109] In some embodiments, one of the liquid outlet connection 421a and the liquid inlet connection 422a includes a receiving connector 43 and the other includes a docking connector 44. The receiving connector 43 encloses and forms a receiving space 431, and at least a portion of the docking connector 44 is located within the receiving space 431.

[0110] At least a portion of the mating joint 44 is located within the receiving space 431, which can be understood as: the entire mating joint 44 extends into the receiving space 431, and the end of the receiving joint 43 can abut against another current collector 42, such as... Figure 8 As shown. Alternatively, a portion of the mating joint 44 is located within the receiving space 431, and the end of the receiving joint 43 is spaced apart from another current collector 42, as shown. Figure 9 As shown.

[0111] For example, during the insertion process, the mating connector 44 of the liquid outlet connection 421a extends into the receiving space 431 of the liquid inlet connection 422a. Alternatively, during the insertion process, the mating connector 44 of the liquid inlet connection 422a extends into the receiving space 431 of the liquid outlet connection 421a. This embodiment of the application illustrates the example where the mating connector 44 is located in the liquid outlet connection 421a.

[0112] The receiving joint 43 provides radial constraint to the mating joint 44 through the receiving space 431 it encloses, allowing the mating joint 44 to automatically correct positional deviations when inserted axially. The depth of the receiving space 431 can be set to cover 60%-90% of the length of the mating joint 44, ensuring sufficient guide stroke during insertion. The gap between the outer peripheral surface of the mating joint 44 and the inner wall surface of the receiving space 431 can be controlled within the range of 0.1-0.5 mm, ensuring smooth assembly while avoiding excessive looseness.

[0113] Optionally, the open end of the receiving joint 43 may be provided with a chamfered structure, with a chamfer angle of 15°-45°, to facilitate guidance when the mating joint 44 is initially inserted. During assembly, the mating joint 44 is inserted into the receiving space 431 along the thickness direction, and the inner wall surface of the receiving space 431 forms surface contact with the outer peripheral surface of the mating joint 44.

[0114] Through the above technical solution, this application achieves precise docking between the liquid outlet connection 421a and the liquid inlet connection 422a. The receiving space 431 of the receiving joint 43 provides physical constraints and guidance for the docking joint 44, ensuring automatic correction of positional deviations during insertion and avoiding misalignment. The design of the docking joint 44 being at least partially embedded in the receiving space 431 reduces the use of external connecting pipes, lowers the number of parts, and reduces assembly complexity. The cooperation between the receiving space 431 and the docking joint 44 enhances the structural stability of the connection, effectively suppresses interface loosening caused by vibration or thermal stress, and improves sealing performance. This embodiment simplifies the connection structure between the collectors 42, improves assembly efficiency, and directly forms flow channel communication through structural nesting, reducing the risk of coolant leakage.

[0115] Reference Figure 8 and Figure 9 In some embodiments, along the thickness direction, the distance between the first collector 421 and the second collector 422 is D1, the protrusion length of the liquid outlet connection 421a relative to the first collector 421 is D2, the protrusion length of the liquid inlet connection 422a relative to the second collector 422 is D3, and D2+D3>D1; wherein, 0.5*D1≤D2≤D1; and / or, 0.5*D1≤D3≤D1.

[0116] The distance between the first current collector 421 and the second current collector 422 can be obtained by measuring the average distance between multiple locations between the root of the outlet connection 421a and the root of the inlet connection 422a. The protruding length of the outlet connection 421a relative to the first current collector 421 can be obtained by measuring the average distance between the side of the outlet connection 421a closest to the second current collector 422 and the root of the outlet connection 421a. Similarly, for the inlet connection 422a, when measuring, for example using a vernier caliper, its length direction must be kept parallel to the thickness direction.

[0117] The constraint condition D2+D3>D1 ensures that the liquid outlet connection 421a and the liquid inlet connection 422a have sufficient effective contact length when inserted, thus avoiding connection and sealing failures due to insufficient insertion depth.

[0118] In these embodiments, limiting D2 and D3 to the range of 0.5*D1 to D1 reduces the risk of assembly difficulties caused by excessively short protrusion lengths, while also reducing the risk of structural interference caused by excessively long protrusions. This improves the stability and sealing reliability of the plug-in structure, effectively mitigating potential sealing failures or structural deformations during assembly, thereby ensuring the stability of coolant flow and heat exchange efficiency.

[0119] In some embodiments, D2 ≥ 0.7 * D1, and D3 ≥ 0.7 * D1.

[0120] In these embodiments, by increasing the lower limit of the protrusion length of the liquid outlet connection 421a and the liquid inlet connection 422a to 0.7 times the spacing of the current collector 42, the liquid outlet connection 421a can form a deeper insertion depth when it is inserted with the liquid inlet connection 422a, thereby reducing the risk of connection gaps caused by processing errors or assembly deviations, and enhancing vibration resistance and sealing reliability.

[0121] Combined with reference Figure 7 and Figure 8 In some embodiments, the liquid outlet connection 421a and the liquid inlet connection 422a are sealed together.

[0122] A sealed connection can be achieved by using a sealing ring. The sealing ring can be made of an elastic material, such as rubber or silicone. The sealing ring is installed between the mating surfaces of the outlet connection 421a and the inlet connection 422a. When the outlet connection 421a and the inlet connection 422a are connected, the sealing ring is compressed, forming a sealing barrier to prevent coolant leakage from the connection.

[0123] The above technical solution effectively improves the problem of coolant leakage that may occur when the outlet connection 421a and the inlet connection 422a are directly connected. The sealed connection design ensures the sealing of the inner cavity of the heat exchange mechanism 4, preventing coolant leakage from the connection point, improving the reliability of the heat exchange mechanism 4, reducing the risk of coolant leakage, and thus ensuring the safety of the battery device 100. At the same time, the sealed connection eliminates the need for additional connecting pipes, simplifying the assembly process and improving efficiency.

[0124] In addition, the sealed connection design enhances the overall structural strength of the heat exchange mechanism 4, improves the vibration resistance of the system, and is conducive to the stable operation of the battery device 100 in various working environments.

[0125] In some embodiments, the receiving joint 43 encloses a receiving space 431, and at least a portion of the mating joint 44 is located within the receiving space 431; wherein the sealing member 441 abuts against the outer wall surface of the mating joint 44 and the inner wall surface of the receiving joint 43, respectively.

[0126] The seal 441 may be made of an elastic material, such as rubber or silicone, and its cross-sectional shape may be circular, rectangular, or trapezoidal. The seal 441 may be pre-compressed and installed on the outer periphery of the mating joint 44. When the mating joint 44 is inserted into the receiving space 431, the seal 441 is subjected to radial compression and elastic deformation, thereby filling the assembly gap between the mating joint 44 and the receiving joint 43.

[0127] Optionally, the compression ratio of seal 441 can be controlled within the range of 15%-30% to ensure sufficient contact pressure while avoiding excessive deformation. In the axial direction of the mating joint 44, the installation position of seal 441 can be located in the region of 1 / 3-1 / 2 length from the end of the mating joint 44 to balance axial and radial sealing requirements.

[0128] When the first manifold 421 and the second manifold 422 are assembled along the thickness direction, the outlet connection 421a is inserted into the receiving space 431 of the inlet connection 422a. The seal 441 is compressed and undergoes radial deformation, forming a tight contact with the inner wall of the receiving joint 43. When the coolant flows through the connected inner cavity, the seal 441 continuously compensates for gap changes caused by vibration or thermal expansion and contraction through its elastic restoring force, preventing liquid leakage.

[0129] In these embodiments, a seal 441 is provided on the outer periphery of the mating joint 44. The elastic deformation characteristics of the seal 441 effectively fill the assembly gap between the joints. Even when vibration or temperature changes cause relative displacement of the joints, the seal 441 maintains a tight fit with the surfaces of the two joints, preventing coolant leakage from the connection. The seal 441 abuts against the inner wall of the receiving joint 43 and the outer wall of the mating joint 44, respectively. Their synergistic effect enhances the reliability and durability of the sealed connection, mitigates potential sealing failures of adjacent collectors 42 under vibration or thermal expansion and contraction conditions, and improves the reliability of the heat exchange mechanism 4.

[0130] In some embodiments, a plurality of annular grooves 442 are arranged sequentially at intervals along the axis of the mating joint 44, and a plurality of seals 441 are arranged in a one-to-one correspondence with the plurality of annular grooves 442. For example, a sealing structure of two or three annular grooves 442 and seals 441 is provided to form a multiple seal.

[0131] The axially spaced arrangement of the annular grooves 442 allows each groove to independently accommodate different seals 441.

[0132] In these embodiments, this configuration improves the pressure concentration problem caused by insufficient contact area of ​​a single-point seal, and the sealing effect of multiple seals is better, improving the fatigue resistance and sealing stability of the connection interface.

[0133] In addition, the sealing structure can work in conjunction with the protruding length parameter of the plug-in mating to ensure reliable docking of the connection within the assembly tolerance range, and eliminate leakage paths through multiple seals, so that the heat exchange mechanism 4 can maintain stable sealing performance under long-term vibration conditions.

[0134] Reference Figure 10 and Figure 11In some embodiments, the first collector 421 has a liquid inlet structure 421b protruding on the side opposite to the second collector 422, and the second collector 422 has a liquid outlet structure 422b protruding on the side opposite to the first collector 421.

[0135] The liquid inlet structure 421b can be configured with reference to the liquid inlet connection part 422a, and the liquid outlet structure 422b can be configured with reference to the liquid outlet connection part 421a. For example, the shape and size of the liquid inlet mechanism are the same as those of the liquid inlet connection part 422a, and the shape and size of the liquid outlet structure 422b are the same as those of the liquid outlet connection part 421a, so as to achieve standardized design of each heat exchanger and its collector 42 structure, which is beneficial to the overall assembly of the heat exchange mechanism 4, improves assembly efficiency and reduces assembly complexity.

[0136] In addition, the liquid inlet structure 421b or the liquid outlet structure 422b can also be used to connect with the pipeline of the heat exchange structure so that the heat exchange medium can flow to the collector 42 at the other end of the heat exchange plate 41 or to the outside.

[0137] In these embodiments, the arrangement of the liquid inlet structure 421b and the liquid outlet structure 422b facilitates the flow of the heat exchange medium and simplifies the assembly of the heat exchange mechanism 4.

[0138] In some embodiments, the heat exchange mechanism 4 further includes an outlet pipe and an inlet pipe; wherein the outlet pipe is inserted into the outlet structure 422b, and / or the inlet pipe is inserted into the inlet structure 421b.

[0139] In these embodiments, the direct plug-in connection between the pipeline and the liquid inlet structure 421b or the liquid outlet structure 422b eliminates the need for additional quick-connect fittings, which helps to reduce the weight of the heat exchange mechanism 4 and reduce the manufacturing cost of the pipeline.

[0140] The self-positioning plug-in structure allows for automatic correction of axial misalignment between the pipe and the manifold 42 interface via the mating surfaces, reducing the requirements for machining and assembly precision. Combined with the existing sealing design between the manifolds 42, a continuous sealing interface is formed from the internal flow channel to the external circulation system, effectively preventing coolant leakage under vibration conditions. This integrated connection method significantly reduces the number of parts, reducing the assembly process to a single plug-in action, thus significantly improving assembly efficiency and the reliability of the heat exchange mechanism 4.

[0141] Secondly, embodiments of this application provide an electrical device including a battery device 100 according to any of the embodiments of the first aspect described above. The battery device 100 is used to provide electrical energy to the electrical device.

[0142] The electrical equipment can be any of the aforementioned devices or systems that utilize battery devices 100.

[0143] Please see Figures 1 to 11According to some embodiments of this application, this application provides a battery device 100, including a housing 300, a battery cell 10, and a heat exchange mechanism 4. The housing 300 has a receiving cavity; the battery cell 10 is disposed in the receiving cavity; the heat exchange mechanism 4 is disposed in the receiving cavity and is thermally connected to the battery cell 10. The heat exchange mechanism 4 includes a plurality of heat exchange plates 41 and a current collector 42 disposed at at least one end of each heat exchange plate 41. The plurality of heat exchange plates 41 are arranged sequentially at intervals along the thickness direction of the heat exchange plates 41, and the inner cavities of two adjacent current collectors 42 are interconnected along the thickness direction. The plurality of current collectors 42 include adjacent first current collectors 421 and second current collectors 422. The first current collector 421 has a liquid outlet connection portion 421a protruding on the side near the second current collector 422, and the second current collector 422 has a liquid inlet connection portion 422a protruding on the side near the first current collector 421. The liquid outlet connection portion 421a is directly connected to the liquid inlet connection portion 422a. The liquid outlet connection 421a is inserted into the liquid inlet connection 422a. One of the liquid outlet connection 421a and the liquid inlet connection 422a includes a receiving connector 43, and the other includes a mating connector 44. The receiving connector 43 encloses a receiving space 431, and at least a portion of the mating connector 44 is located within the receiving space 431. A sealing element 441 is provided around the outer periphery of the mating connector 44, and the sealing element 441 abuts against the outer wall surface of the mating connector 44 and the inner wall surface of the receiving connector 43, respectively. An annular groove 442 is formed around the outer periphery of the mating connector 44, and a portion of the sealing element 441 is embedded within the annular groove 442. A liquid inlet structure 421b protrudes from the side of the first collector 421 opposite to the side of the second collector 422, and a liquid outlet structure 422b protrudes from the side of the second collector 422 opposite to the side of the first collector 421.

[0144] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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: The box-shaped enclosure has a receiving cavity; A single battery cell is disposed within the receiving cavity; A heat exchange mechanism is disposed in the receiving cavity and thermally connected to the battery cell. The heat exchange mechanism includes a plurality of heat exchange plates and a current collector disposed at at least one end of each heat exchange plate. The plurality of heat exchange plates are arranged at intervals along the thickness direction of the heat exchange plates, and the inner cavities of two adjacent current collectors along the thickness direction are interconnected. Among them, the plurality of current collectors include an adjacent first current collector and a second current collector. The first current collector has a liquid outlet connection portion protruding on the side near the second current collector, and the second current collector has a liquid inlet connection portion protruding on the side near the first current collector. The liquid outlet connection portion is directly connected to the liquid inlet connection portion. One of the liquid outlet connection and the liquid inlet connection includes a receiving connector, and the other includes a mating connector. The outer periphery of the mating connector is provided with a sealing element, and an annular groove is formed on the outer periphery of the mating connector. A portion of the sealing element is embedded in the annular groove.

2. The battery device according to claim 1, characterized in that, The liquid outlet connection is inserted into the liquid inlet connection.

3. The battery device according to claim 2, characterized in that, The receiving joint encloses a receiving space, and at least a portion of the mating joint is located within the receiving space.

4. The battery device according to claim 2, characterized in that, Along the thickness direction, the distance between the first current collector and the second current collector is D1, the protrusion length of the liquid outlet connection relative to the first current collector is D2, the protrusion length of the liquid inlet connection relative to the second current collector is D3, and D2+D3>D1; Wherein, 0.5*D1≤D2≤D1; and / or, 0.5*D1≤D3≤D1.

5. The battery device according to claim 4, characterized in that, D2≥0.7*D1, and D3≥0.7*D1.

6. The battery device according to claim 1, characterized in that, The liquid outlet connection is sealed to the liquid inlet connection.

7. The battery device according to claim 6, characterized in that, The receiving joint encloses and forms a receiving space, and at least a portion of the mating joint is located within the receiving space; The sealing element abuts against the outer wall surface of the mating joint and the inner wall surface of the receiving joint, respectively.

8. The battery device according to claim 1, characterized in that, Multiple annular grooves are arranged sequentially at intervals along the axis of the mating joint, and multiple sealing elements are arranged in one-to-one correspondence with the multiple annular grooves.

9. The battery device according to any one of claims 1 to 8, characterized in that, The first current collector has a liquid inlet structure protruding on the side opposite to the second current collector, and the second current collector has a liquid outlet structure protruding on the side opposite to the first current collector.

10. The battery device according to claim 9, characterized in that, The heat exchange mechanism also includes an outlet pipe and an inlet pipe; Wherein, the liquid outlet pipe is plugged into the liquid outlet structure, and / or, the liquid inlet pipe is plugged into the liquid inlet structure.

11. An electrical appliance, characterized in that, The battery device includes any one of claims 1 to 10, the battery device being used to provide electrical energy.

Images