Battery device and electric appliance

Abstract

The application discloses a battery device and an electric device. The battery device comprises a box body, a battery monomer and a heat exchange assembly. The box body has a containing space, and the battery monomer is arranged in the containing space. The battery monomer comprises a first wall, and an electrode terminal is arranged on the first wall. The heat exchange assembly is arranged between the box body and the first wall, and comprises a current collector and a first heat exchange part. The heat exchange assembly and the battery monomer are arranged along a first direction. The current collector is connected to one side of the first heat exchange part along a second direction, and the first direction and the second direction are perpendicular to each other. The first heat exchange part comprises flow channel plates and sealing plates which are arranged in a stack along the first direction, and the flow channel plates and the sealing plates form heat exchange flow channels which extend along the second direction. The current collector is provided with a first flow port which faces the first direction, and the first heat exchange part is provided with a second flow port which corresponds to the first flow port. The technical scheme of the application can improve the internal space utilization rate of the battery device and improve the space energy density of the battery device.

Description

Technical Field

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

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

[0003] Heat exchange components are installed in the battery device to exchange heat for the individual battery cells. However, the installation of heat exchange components occupies a lot of space inside the battery device, resulting in low space utilization and low spatial energy density of the battery device. Utility Model Content

[0004] In view of the above problems, this application provides a battery device and an electrical device that can improve the internal space utilization of the battery device and increase the spatial energy density of the battery device.

[0005] In a first aspect, this application provides a battery device, including a housing, a battery cell, and a heat exchange assembly. The housing has a receiving space, and the battery cell is disposed in the receiving space. The battery cell includes a first wall, on which electrode terminals are provided. The heat exchange assembly is disposed between the housing and the first wall, and includes a current collector and a first heat exchange section. The heat exchange assembly and the battery cell are arranged along a first direction. The current collector is connected to one side of the first heat exchange section along a second direction, and the first direction and the second direction are perpendicular to each other. The first heat exchange section includes a flow channel plate and a sealing plate stacked along the first direction, and a heat exchange flow channel extending along the second direction is formed between the flow channel plate and the sealing plate. The current collector has a first flow port facing the first direction, and the first heat exchange section has a second flow port corresponding to the first flow port.

[0006] In the technical solution of this application embodiment, a housing is provided to offer a stable environment for the battery cells, reducing the impact of external impurities and moisture on the battery cells and electrical components. A heat exchange assembly exchanges heat with the battery cells, promptly removing the heat generated during operation or raising the temperature of the battery cells in low-temperature environments to improve their efficiency. The heat exchange assembly is positioned between the first wall and the housing, fully utilizing the space between the electrode terminals on the battery cells and the housing. Furthermore, placing the heat exchange assembly near the electrode terminals improves heat exchange efficiency near the terminals and reduces the housing space occupied by the heat exchange assembly. The current collector is located on one side of the first heat exchange section, fully utilizing the space on the side of the housing and facilitating heat exchange with the first heat exchange section. The first flow port opens in the first direction and connects in a direction perpendicular to the current collector. The connection process does not occupy additional side space; the space required for the entire fluid connection is compressed and hidden within the two-dimensional plane where the current collector connects to the first heat exchange section, eliminating the need for any structure protruding to the side or top of the battery cell assembly. The current collector and the first heat exchange section can be made into a flat, layered structure, which adapts to the space on the side of the electrode terminals, achieving efficient heat exchange in a limited space, transforming ineffective assembly space into effective functional space, and improving the energy density of the battery device.

[0007] In some embodiments, a flow channel plate is disposed on the side of the sealing plate opposite to the battery cell, and a concave heat exchange groove is provided on the surface of the flow channel plate facing the sealing plate. The sealing plate covers and seals the heat exchange groove to jointly form a heat exchange flow channel extending along the second direction. This structure efficiently integrates thermal management functions within the narrow space between the battery cell and the housing, improving the overall energy density of the battery device.

[0008] In some embodiments, the current collector is located on the side of the sealing plate away from the flow channel plate, and the sealing plate and the current collector are connected by brazing. In the above structure, with the current collector located on the side of the sealing plate away from the flow channel plate, the gap between the first heat exchange section and the battery cell can be reduced, improving the heat exchange stability of the first heat exchange section.

[0009] In some embodiments, the current collector is provided with a liquid supply channel and a liquid collection channel extending along a third direction. The liquid supply channel and the liquid collection channel are independent of each other and arranged sequentially along a second direction within the current collector. The third direction is perpendicular to both the second direction and the first direction. The current collector is also provided with a liquid supply hole and a liquid collection hole, the liquid supply hole communicating with the liquid supply channel and the liquid collection hole communicating with the liquid collection channel. In the above structure, turbulence and eddies caused by the complex and intersecting flow channels are reduced, the flow resistance of the system is reduced, and the energy efficiency of the entire heat exchange assembly is improved. The liquid supply channel is used to distribute the heat exchange medium in parallel to the inlet of each first heat exchange section, and the liquid collection channel is used to collect the return liquid in parallel from the outlet of each first heat exchange section. This reduces the pressure difference and temperature difference between the upstream and downstream processes in the series distribution, improves the flow balance of each flow channel on the flow channel plate, improves the consistency of the heat exchange efficiency of the entire battery cell assembly, and improves the overall lifespan and performance of the battery device.

[0010] In some embodiments, the first heat exchange section includes an inlet channel and an outlet channel arranged sequentially along a third direction, both extending along a second direction. The extension length of the inlet channel along the second direction is L1, and the extension length of the outlet channel along the second direction is L2, wherein L1 > L2. This structure improves the temperature uniformity of the battery cell assembly in the second direction, thereby enhancing the consistency of the operating state of multiple battery cells and extending cycle life.

[0011] In some embodiments, the first heat exchange section further includes a first through hole and a second through hole. The first through hole communicates with the liquid inlet channel and is corresponding to the liquid supply hole on the collector. The second through hole communicates with the liquid outlet channel and is corresponding to the liquid collection hole on the collector. The first and second through holes are located on opposite sides of the first heat exchange section along a third direction. This structure spatially separates the two main stress concentration points, preventing excessive local superposition of thermal stress generated during brazing heating and cooling. This improves the structural integrity of the interface between the collector and the first heat exchange section, reduces the risk of welding deformation and cracking, and enhances the long-term reliability and fatigue life of the connection joint under vibration, thermal cycling, and other conditions.

[0012] In some embodiments, the first heat exchange section is further provided with a connecting channel, one end of which is connected to the liquid inlet channel and the other end of which is connected to the liquid outlet channel. The above structure connects the internal channels through the connecting channel, achieving a series connection, which simplifies the structure of the internal channels and improves the uniformity of the heat exchange medium flow velocity within the channels.

[0013] In some embodiments, there are multiple liquid inlet channels, which are connected in parallel sequentially. This structure distributes the heat exchange medium through multiple parallel liquid inlet channels, shortening the heat conduction path from the channels to the battery body, reducing thermal resistance, and lowering the risk of efficiency reduction in individual battery cells due to temperature exceeding a threshold, thereby improving the overall energy utilization efficiency of the battery system.

[0014] In some embodiments, there are multiple liquid outlet channels, which are connected in parallel sequentially. This structure provides a low-resistance collection path for the heated heat exchange medium, avoiding kinetic energy dissipation and eddy current losses caused by sudden and drastic expansion of the flow cross-section.

[0015] In some embodiments, there are multiple first heat exchange sections, which are arranged sequentially along a third direction and spaced apart from each other. The above structure employs multiple independent first heat exchange sections arranged in parallel, with each shorter section responsible for cooling a segment of the module. All heat exchange sections receive low-temperature heat exchange medium from the main liquid supply channel in parallel through a current collector. Each battery segment can be heated by a heat exchange medium at a substantially uniform temperature, reducing the axial temperature gradient caused by excessively long channels and improving the temperature uniformity of large-size battery cell modules.

[0016] In some embodiments, the heat exchange assembly further includes a second heat exchange section, which has at least one unidirectional flow channel extending along a second direction. The second heat exchange section is located on one side of the first heat exchange section along a third direction. This structure, by adding the second heat exchange section, increases the total heat exchange area between the heat exchange assembly and the battery cell, enabling it to handle higher charge / discharge rates, more quickly remove or introduce heat, effectively control battery temperature, prevent thermal runaway, and meet the thermal requirements of higher-performance battery systems.

[0017] In some embodiments, there are two second heat exchange sections, which are connected to the two ends of the current collector along a third direction, with the first heat exchange section located between the two second heat exchange sections. In this structure, the unidirectional flow channels of the two second heat exchange sections can serve as the heat exchange medium input channel and output channel, respectively, and can also themselves provide heat exchange for the battery cells. Furthermore, the unidirectional flow channel design is simple in structure and easy to mold.

[0018] In some embodiments, the current collector is provided with a third flow port, and the second heat exchange section is provided with a fourth flow port corresponding to the third flow port, the fourth flow port being connected to the third flow port. This structure establishes a structural and fluid connection between the current collector and the second heat exchange section by connecting the third and fourth flow ports, and achieves a permanent seal through processes such as brazing, allowing the heat exchange medium to flow seamlessly between the distribution channel of the current collector and the unidirectional channel of the second heat exchange section.

[0019] In some embodiments, the third flow port opens towards the second direction, and the fourth flow port is located at the end of the second heat exchange section along the second direction. The end of the second heat exchange section is inserted into the third flow port of the collector, connecting the fourth flow port with the third flow port. During assembly, the second heat exchange section can be simply moved along the second direction (its length direction) and directly inserted into the collector to complete the initial positioning and connection. No complex angle adjustments or rotations are required; linear movement in a single direction is sufficient, facilitating automated installation. Furthermore, this structure effectively resists shear forces and vibrations from the third direction, reducing the risk of fatigue fracture at the connection due to vibration, making the connection between the second heat exchange section and the collector more stable, and further enhancing the rigidity and integrity of the entire integrated module. Finally, compared to planar butt welding, this socket-type weld has a longer weld length, can withstand higher burst pressure and fatigue stress, and reduces the risk of leakage at the connection point.

[0020] In some embodiments, the portion of the second heat exchange section near the fourth flow port is bent towards the direction closer to the battery cell. This structure maximizes the use of the narrow space in the first direction, improving space utilization and energy density. The bending design ensures a tight, gapless contact between the main body of the second heat exchange section and the battery cell, reducing contact thermal resistance. This helps improve the uniformity of the overall temperature field of the battery cell assembly and prevents overheating or undercooling of the battery cells at the ends.

[0021] In some embodiments, the current collector includes a first current collector and a second current collector. The first current collector has a liquid supply channel extending in a third direction. The second current collector is connected to one side of the first current collector in a second direction, and also has a liquid collection channel extending in a third direction. The first current collector has a first end and a second end opposite to each other in the third direction, and the second current collector has a third end and a fourth end opposite to each other in the third direction. The first end protrudes beyond the end face of the third end in the third direction. A second heat exchange section is connected to the first end, which has a current collector liquid supply port. The second heat exchange section also has a heat exchange section liquid supply port, which communicates with the heat exchange section liquid supply port. This structure, by extending one end of the first current collector in the third direction beyond the end face of the second current collector, creates an independent mounting platform for the liquid supply interface, allowing the heat exchange medium to be directly obtained from the main liquid supply pipe, resulting in the most stable flow rate and pressure.

[0022] In some embodiments, there are two second heat exchange sections, with a first heat exchange section located between the two second heat exchange sections. The two second heat exchange sections are respectively connected to a first end and a fourth end. The fourth end protrudes beyond the end face where the second end is located in the third direction. The fourth end is provided with a current collector outlet, and the second heat exchange section connected to the fourth end is provided with a heat exchange section outlet, which communicates with the current collector outlet. Both ends of the first manifold protrude and are symmetrically connected to the two second heat exchange sections as liquid supply ports. The two ends of the second manifold are also symmetrically connected as liquid return ports, forming a hydraulically symmetrical structure. This allows the two second heat exchange sections located on the sides to obtain balanced flow and cooling effect, thereby improving the symmetry and uniformity of the temperature on both sides of the battery cell assembly in the third direction, effectively improving the consistency and cycle life of the entire battery device.

[0023] In some embodiments, the second heat exchange section has a fifth flow port at the end opposite to the third flow port along the second direction. The fifth flow port is used to connect to the medium supply source, and the current collector is connected to the end of the second heat exchange section away from the fifth flow port along the second direction. With this structure, the flow rate and pressure of the two loops can be controlled independently without interference, avoiding the flow competition problem in complex parallel networks. Furthermore, the heat exchange medium does not need to first flow into the current collector for distribution before entering the second heat exchange section. Instead, it enters directly from the nearest fifth flow port, resulting in a shorter flow path and lower flow resistance, thereby improving heat exchange efficiency.

[0024] In some embodiments, the housing includes a protective plate, a heat exchange assembly is disposed between the battery cell and the protective plate, and the heat exchange assembly further includes a buffer member disposed between the heat exchange assembly and the plate. In this structure, the buffer member absorbs and dissipates energy through its own compression deformation, reserving space for the natural expansion of the battery during charge-discharge cycles and providing flexible restraint, thus preventing excessive compression of the battery by the rigid structure and extending battery life.

[0025] In some embodiments, a pressure relief mechanism is further provided on the first wall, which is disposed opposite to the protective plate. With the above structure, the heat exchange assembly can promptly cool the substance released by the pressure relief mechanism, reducing the risk of secondary damage to other battery cells after thermal runaway of a single battery cell, and improving the operational stability of the battery cell assembly.

[0026] In some embodiments, the battery device further includes a battery cell assembly and an output electrode. The battery cell assembly includes a plurality of battery cells arranged sequentially along a second direction. The output electrode is used to electrically connect the battery cell assembly to an external structure, and is located at the end of the first heat exchange section away from the current collector along the second direction. This structure achieves physical isolation between the electrical interface and the heat exchange medium interface, ensuring the reliability of long-term connection.

[0027] In some embodiments, the projection of the first heat exchange section along a first direction covers at least a portion of the adjacent battery cells for heat exchange with the adjacent battery cells. The above structure, utilizing the space between two adjacent battery cells to arrange the first heat exchange section, further utilizes the internal space of the housing and allows for close contact with the shoulder of the battery cell for heat exchange, rapidly removing heat from the battery cell and improving heat exchange efficiency. Simultaneously, the regular spatial arrangement facilitates the installation of the first heat exchange section, enhancing the convenience of installation and maintenance.

[0028] Secondly, 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.

[0029] 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

[0030] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the structure of a vehicle according to one embodiment of this application; Figure 2 This is an exploded view of the battery device provided in some embodiments of this application; Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application; Figure 4 This is a schematic diagram of the structure of a heat exchange component according to some embodiments of this application; Figure 5 This is an exploded structural diagram of a heat exchange component according to some embodiments of this application; Figure 6 This is an exploded structural diagram of a heat exchange component according to other embodiments of this application; Figure 7 yes Figure 6 A magnified structural diagram of part A in the middle; Figure 8 This is a partial structural schematic diagram of a heat exchange component according to other embodiments of this application; Figure 9 This is a partial structural schematic diagram of a heat exchange component according to other embodiments of this application; Figure 10 This is an exploded structural diagram of a heat exchange component according to other embodiments of this application; Figure 11 This is a schematic diagram of the structure of the second heat exchange section in some embodiments of this application; Figure 12 yes Figure 11 A magnified structural diagram of part B in the middle section; Figure 13 yes Figure 10 Enlarged structural diagram of section C; Figure 14 yes Figure 4 Enlarged structural diagram of section D; Figure 15 This is a schematic diagram of the structure of the current collector in some embodiments of this application; Figure 16 The diagram below shows the structure of a heat exchange component according to some embodiments of this application.

[0032] Detailed Explanation of Reference Numerals 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. Top cover; 5b. Lower housing; 5c. Reception space; 6. Battery cell; 601. First wall; 10. Electrode assembly; 20. Housing; 25. Electrode terminal; 26. Pressure relief mechanism; 30. End cap; 40. Housing; 7. Heat exchange assembly; 701. Current collector; 702. First heat exchange section; 703. Flow channel plate; 704. Sealing plate; 705. Heat exchange flow channel; 706. First outlet; 707. Second outlet; 708. Heat exchange groove; 709. Liquid supply flow channel; 710. Liquid collection flow channel; 711. Liquid inlet flow channel; 712. Liquid outlet flow channel; 713. Liquid supply hole; 714. Liquid collection hole; 715. Second heat exchange section; 716. Connecting flow channel; 717. First through hole; 718. Second 719. Through hole; 720. One-way flow channel; 721. Third flow port; 722. Fourth flow port; 723. Bend; 724. First manifold; 725. Second manifold; 726. First end; 727. Second end; 728. Third end; 729. Liquid supply port for manifold; 730. Liquid supply port for heat exchange section; 731. Fifth flow port; 732. Liquid inlet heat exchange. 733, Liquid outlet heat exchange section; 734, Liquid inlet; 735, Liquid outlet; 736, Liquid inlet heat exchange channel; 737, Liquid outlet heat exchange channel; 738, First plate; 739, Second plate; 740, Third plate; 741, Fourth plate; 742, Total inlet; 743, Total outlet; 8, Output electrode plate; 9, Battery cell assembly; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0038] 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).

[0039] 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.

[0040] 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.

[0041] In this application, "multiple" means two or more (including two).

[0042] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0043] The battery mentioned in the embodiments of this application may be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0044] In some embodiments, the battery can be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0045] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0046] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0047] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0048] A single battery cell typically includes an electrode assembly. The electrode assembly comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0049] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0050] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0051] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of silver-treated stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0052] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0053] In some embodiments, the positive electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0054] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0055] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, silver-surfaced stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0056] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0057] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0058] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0059] In some embodiments, the negative electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0060] As an example, lithium source material, potassium metal or sodium metal may also be filled or deposited in the negative electrode current collector, wherein the lithium source material is lithium metal and / or lithium-rich material.

[0061] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0062] In some embodiments, the electrode assembly further includes a separator disposed between the positive and negative electrodes. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected.

[0063] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0064] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0065] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0066] In some implementations, the electrode assembly is a stacked structure.

[0067] Multiple positive and negative electrodes can be set separately, and multiple positive and multiple negative electrodes can be stacked alternately.

[0068] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

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

[0070] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0071] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0072] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0073] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0074] The heat exchange components in a battery pack are used to regulate the temperature of individual battery cells to ensure they operate within a suitable temperature range. In related technologies, multiple heat exchange plates are often required to achieve heat exchange between individual battery cells, connected by complex piping and connectors. These pipes and connectors occupy a significant amount of internal space, leading to a decrease in the overall spatial energy density of the battery pack.

[0075] In view of this, this application provides a battery device in which a heat exchange component is disposed between the first wall of the battery cell and the housing, which can make full use of the space between the electrode terminals on the battery cell and the housing. Furthermore, the heat exchange component is disposed near the electrode terminals, which can improve the heat exchange efficiency near the electrode terminals and reduce the housing space occupied by the heat exchange component. Simultaneously, the current collector is disposed on one side of the first heat exchange section, making full use of the space on the side of the housing and facilitating heat exchange with the first heat exchange section. The first flow port opens in a first direction and connects in a direction perpendicular to the current collector. The connection process does not occupy additional side space; the space required for the entire fluid connection is compressed and hidden within the plane where the current collector and the first heat exchange section meet, eliminating the need for any structure protruding to the side or top of the battery cell assembly. Moreover, the current collector and the first heat exchange section can be made into a flat, layered structure, adapting to the space on the side of the electrode terminals, achieving efficient heat exchange within a limited space, transforming ineffective assembly space into effective functional space, and improving the spatial energy density of the battery device.

[0076] The technical solutions described in the embodiments of this application are applicable to electrode assemblies, battery cells including electrode elements, batteries including battery cells, and electrical devices using batteries.

[0077] Electrical devices 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 devices.

[0078] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0079] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1 provided in some embodiments of this application. Vehicle 1 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 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0080] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0081] Please refer to Figure 2 , Figure 2This is an exploded structural diagram of a battery device 2 provided in some embodiments of this application. The battery device 2 includes a housing 5 and a battery cell 6. In some embodiments, the battery housing 5 may include an upper cover 5a and a lower housing 5b, which cover each other and together define a receiving cavity for accommodating the battery cell 6. The lower housing 5b may be a hollow structure with one end open, and the upper cover 5a may be a plate-like structure, covering the open side of the lower housing 5b so that the upper cover 5a and the lower housing 5b together define the receiving cavity; the upper cover 5a and the lower housing 5b may also be hollow structures with one side open, with the open side of the upper cover 5a covering the open side of the lower housing 5b. Of course, the lower battery housing 5b formed by the upper cover 5a and the lower housing 5b may be of various shapes, such as a cylinder, a cuboid, etc.

[0082] In the battery device 2, there can be multiple battery cells 6, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 6 are connected in both series and parallel connections. Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 6 is housed within the housing 5. Alternatively, the battery device 2 can also consist of multiple battery cells 6 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 5. The battery device 2 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 6.

[0083] Each battery cell 6 can be a secondary battery cell 6 or a primary battery cell 6; it can also be a lithium-sulfur battery cell 6, a sodium-ion battery cell 6, or a magnesium-ion battery cell 6, but is not limited to these. The battery cell 6 can be cylindrical, flat, cuboid, or other shapes.

[0084] Figure 3 This is an exploded structural diagram of a battery cell 6 according to some embodiments of this application. The battery cell 6 includes a point electrode assembly 10 and a housing 20. The housing 20 includes an end cap 30 and a casing 40. The end cap 30 is a component that covers the opening of the casing 40 to isolate the internal environment of the battery cell 6 from the external environment. The shape of the end cap 30 can be adapted to the shape of the casing 40 to fit the casing 40. Optionally, the end cap 30 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 30 is less prone to deformation under pressure and impact, enabling the battery cell 6 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 25 can be provided on the end cap 30. The electrode terminals 25 can be used to electrically connect to the electrode assembly 10 for outputting or inputting electrical energy into the battery cell 6.

[0085] In some embodiments, the end cap 30 may also be provided with a pressure relief mechanism 26 for releasing internal pressure when the internal pressure or temperature of the battery cell 6 reaches a threshold. The end cap 30 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap 30. The insulating member can be used to isolate the electrical connection components within the housing 40 from the end cap 30 to reduce the risk of short circuits. For example, the insulating member can be plastic, rubber, etc.

[0086] Please refer to the reference. Figures 2 to 4 , Figure 2 This is an exploded view of the battery device 2 provided in some embodiments of this application. Figure 3 This is an exploded structural diagram of the battery cell 6 in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of the heat exchange component 7 in some embodiments of this application.

[0087] As shown in the figure, the battery device 2 provided in this embodiment includes a housing 5, a battery cell 6, and a heat exchange assembly 7. The housing 5 has a receiving space 5c, and the battery cell 6 is disposed in the receiving space 5c. The battery cell 6 includes a first wall 601, on which electrode terminals 25 are provided. The heat exchange assembly 7 is disposed between the housing 5 and the first wall 601. The heat exchange assembly 7 includes a current collector 701 and a first heat exchange section 702. The heat exchange assembly 7 and the battery cell 6 are arranged along a first direction X. The current collector 701 is connected to one side of the first heat exchange section 702 along a second direction Y. The first direction X and the second direction Y are perpendicular to each other. The first heat exchange section 702 includes a flow channel plate 703 and a sealing plate 704 stacked along the first direction X. A heat exchange flow channel 705 extending along the second direction Y is formed between the flow channel plate 703 and the sealing plate 704. The current collector 701 is provided with a first flow port 706 facing the first direction X, and the first heat exchange part 702 is provided with a second flow port 707 corresponding to the first flow port 706.

[0088] The housing 5 provides external support and protection for the entire battery unit 2. Its accommodating space 5c is used to house the individual battery cells 6, serving to fix and accommodate the core battery components. Therefore, it provides a stable environment for the battery cells 6, reducing the impact of external impurities and moisture on the battery cells 6 and electrical components. The heat exchange assembly 7 exchanges heat for the battery cells 6, promptly removing the heat generated during operation, or raising the temperature of the battery cells 6 in low-temperature environments to improve their efficiency.

[0089] The battery cell 6 is the basic unit in the battery device 2 for storing and releasing electrical energy, and the first wall 601 is one of its components. For example, the first wall 601 is the end cap 30 or the bottom wall of the battery cell 6. Electrode terminals 25 are provided on the first wall 601 to enable electrical connection between the battery cell 6 and an external circuit for the input and output of electrical energy.

[0090] The heat exchange assembly 7 has a collector 701 connected to one side of the first heat exchange section 702 along the second direction Y, serving to collect or distribute the heat exchange medium. It has a first flow port 706 facing the first direction X for the flow of the heat exchange medium. The first heat exchange section 702 consists of a flow channel plate 703 and a sealing plate 704 stacked along the first direction X. Heat exchange channels 705 extending along the second direction Y are formed between the flow channel plate 703 and the sealing plate 704. These heat exchange channels 705 are channels for fluid flow and heat exchange. The first heat exchange section 702 has a second flow port 707 corresponding to the first flow port 706 on the collector 701, ensuring smooth fluid flow between the collector 701 and the first heat exchange section 702. The flow channel plate 703 and the sealing plate 704 are stacked to form a heat exchange flow channel 705, which increases the heat exchange area and makes the heat exchange between the heat exchange medium and the battery cell 6 more complete and efficient. It can quickly remove the heat generated by the battery cell 6 and improve the heat exchange efficiency.

[0091] The heat exchange assembly 7 is disposed between the first wall 601 and the housing 5, which can make full use of the space between the electrode terminal 25 on the battery cell 6 and the housing 5. Furthermore, the heat exchange assembly 7 is located near the electrode terminal 25, which improves the heat exchange efficiency near the electrode terminal 25 and reduces the space occupied by the heat exchange assembly 7 in the housing 5. Additionally, the current collector 701 is disposed on one side of the first heat exchange section 702, making full use of the space on the side of the housing 5 and facilitating heat exchange with the first heat exchange section 702. The first outlet 706 opens towards the first direction X and is connected in a direction perpendicular to the current collector 701, without occupying additional side space during the connection process.

[0092] The space required for the entire fluid connection is compressed and hidden within the two-dimensional plane where the current collector 701 and the first heat exchanger 702 dock, eliminating the need for any structure to protrude onto the side (second direction Y) or top of the battery cell assembly 9. The current collector 701 and the first heat exchanger 702 can be made into a flat, layered structure that adapts to the space on the side of the electrode terminal 25, achieving efficient heat exchange within a limited space, transforming ineffective assembly space into effective functional space, and improving the energy density of the battery device 2.

[0093] like Figure 5As shown, in some embodiments of this application, the flow channel plate 703 is disposed on the side of the sealing plate 704 away from the battery cell 6, and the surface of the flow channel plate 703 facing the sealing plate 704 is provided with a concave heat exchange groove 708. The sealing plate 704 covers and seals the heat exchange groove 708 to jointly form a heat exchange flow channel 705 extending along the second direction Y.

[0094] The flow channel plate 703 is located on the side of the sealing plate 704 opposite to the battery cell 6, and its surface facing the sealing plate 704 has a recessed heat exchange groove 708. The flow channel plate 703 is one of the key components forming the heat exchange channel 705, providing a space for the heat exchange medium to flow through its special groove structure. The sealing plate 704 cooperates with the flow channel plate 703, covering the side of the flow channel plate 703 with the heat exchange groove 708, sealing the heat exchange groove 708, and together with the flow channel plate 703, forming the heat exchange channel 705 extending along the second direction Y. The sealing plate 704 plays a sealing and enclosing role, ensuring that the heat exchange medium can flow in the heat exchange channel 705 along a predetermined path without leakage. The heat exchange channel 705 is formed by the heat exchange groove 708 on the flow channel plate 703 and the sealing plate 704, extending along the second direction Y. The heat exchange channel 705 is a channel for the flow of heat exchange medium. Through the flow of heat exchange medium in it, heat exchange is achieved between the heat exchange medium and the battery cell 6, thereby achieving the purpose of thermal management of the battery cell 6.

[0095] In the aforementioned structure, the first heat exchange section 702 can be made very thin, minimizing its impact on the internal space of the battery device 2. Within the narrow space between the battery cell 6 and the housing 5, thermal management functions are efficiently integrated, avoiding excessive sacrifice of battery placement space due to the addition of a cooling system, thus improving the overall energy density of the battery device 2. The sealing plate 704 is in direct contact with the battery cell 6, and the heat exchange medium is directly transferred to the battery through the plane of the sealing plate 704, achieving efficient heat transfer. This effectively copes with the high-rate heat generation during fast charging, ensuring the battery operates within its optimal temperature range and improving battery performance and lifespan.

[0096] In some embodiments of this application, the current collector 701 is located on the side of the sealing plate 704 away from the flow channel plate 703, and the sealing plate 704 and the current collector 701 are connected by brazing.

[0097] In the aforementioned structure, the current collector 701 is located on the side of the sealing plate 704 opposite to the flow channel plate 703, which can reduce the gap between the first heat exchange section 702 and the battery cell 6, and improve the heat exchange stability of the first heat exchange section 702. The brazing process melts the brazing filler metal at high temperature and penetrates into the contact interface between the current collector 701 and the sealing plate 704, forming a metallurgical bond. Its sealing performance and structural strength are equal to the base material, reducing the risk of cooling medium leakage and improving the operational stability of the battery device 2.

[0098] like Figure 6 As shown, in some embodiments of this application, the current collector 701 is provided with a liquid supply channel 709 and a liquid collection channel 710 extending along a third direction Z. The liquid supply channel 709 and the liquid collection channel 710 are independent of each other within the current collector 701 and are arranged sequentially along a second direction Y. The third direction Z is perpendicular to both the second direction Y and the first direction X. For example, the first direction X may be the thickness direction of the sealing plate 704 or the height direction of the battery cell 6. The second direction Y may be the thickness direction of the battery cell 6, and the third direction Z may be the width direction of the battery cell 6.

[0099] The collector 701 is also provided with a liquid supply hole 713 and a liquid collection hole 714. The liquid supply hole 713 is connected to the liquid supply channel 709, and the liquid collection hole 714 is connected to the liquid collection channel 710. The liquid supply hole 713 refers to a hole that runs through the collector 701, through which the heat exchange medium can enter or exit the liquid supply channel 709. The liquid collection hole 714 refers to a hole that runs through the collector 701, through which the heat exchange medium can enter or exit the liquid collection channel 710.

[0100] In the aforementioned structure, the independent, straight flow channel design extending Z-direction provides a smooth liquid flow path, reducing turbulence and eddies caused by complex and intersecting flow channels, lowering the system's flow resistance, thereby reducing the power consumption of the water pump and improving the overall system energy efficiency. The supply flow channel 709 is used to distribute the heat exchange medium in parallel to the inlets of each first heat exchange unit 702, and the collection flow channel 710 is used to collect the return liquid in parallel from the outlets of each first heat exchange unit 702. This reduces the pressure and temperature differences between the preceding and following flows in the series distribution, improves the flow balance of each flow channel on the flow channel plate 703, enhances the consistency of the heat exchange efficiency of the entire battery cell assembly 9, and improves the overall lifespan and performance of the battery device 2. The distribution and collection functions of the heat exchange assembly 7 are fully integrated into the current collector 701, requiring only two pipes (one supply port 713 and one collection port 714) to connect to the system externally. This simplifies the interface between the heat exchange assembly 7 and the external cooling system, reducing assembly complexity and the risk of external leakage.

[0101] like Figure 6 as well as Figure 7 As shown, in some embodiments of this application, the first heat exchange section 702 is provided with an inlet channel 711 and an outlet channel 712 arranged sequentially along the third direction Z. Both the inlet channel 711 and the outlet channel 712 extend along the second direction Y. The extension length of the inlet channel 711 along the second direction Y is L1, and the extension length of the outlet channel 712 along the second direction Y is L2, wherein L1 > L2. Optionally, the two outlet channels 712 are located on one side of the two inlet channels 711 along the third direction Z.

[0102] In the aforementioned structure, the longer inlet flow channel 711 allows the low-temperature heat exchange medium to undergo a deeper heat exchange process in the high heat load region, fully absorbing heat and slowing down its temperature rise rate. The shorter return path allows the heated heat exchange medium to quickly leave the heat exchange zone, reducing its thermal interference to the low-temperature region. This reduces the axial temperature gradient caused by the process flow, improves the temperature uniformity of the battery cell assembly 9 in the second direction Y, thereby improving the consistency of the operating state of multiple battery cells 6 and extending cycle life.

[0103] like Figure 5 as well as Figure 6 As shown, in some optional embodiments, the heat exchange assembly 7 further includes an inlet heat exchange section 732 and an outlet heat exchange section 733. The inlet heat exchange section 732 and the outlet heat exchange section 733 are respectively connected to the current collector 701.

[0104] The liquid inlet heat exchange section 732 is provided with a liquid inlet heat exchange channel 736 extending along the second direction Y, and the liquid inlet heat exchange channel 736 is connected to the liquid supply channel 709. The liquid inlet heat exchange section 732 is provided with a liquid inlet 734 for introducing heat exchange medium into the liquid inlet heat exchange section 732. Furthermore, at least a portion of the liquid inlet heat exchange section 732 is in contact with the first wall 601 of the battery cell 6 for heat exchange.

[0105] The liquid outlet heat exchange section 733 is provided with a liquid outlet heat exchange channel 737 extending along the second direction Y, and the liquid outlet heat exchange channel 737 is connected to the liquid collection channel 710. The liquid outlet heat exchange section 733 is provided with a liquid outlet 735 for discharging the heat exchange medium in the liquid outlet heat exchange section 733. Furthermore, at least a portion of the liquid outlet heat exchange section 733 is in contact with the first wall 601 of the battery cell 6 for heat exchange.

[0106] Optionally, the liquid inlet 734 is located at one end of the liquid inlet heat exchange section 732 away from the collector 701 along the second direction Y, and the liquid outlet 735 is located at one end of the liquid outlet heat exchange section 733 away from the collector 701 along the second direction Y.

[0107] Optionally, the liquid inlet heat exchange section 732 and the liquid outlet heat exchange section 733 are spaced apart along the third direction Z, and the first heat exchange section 702 is disposed between the liquid inlet heat exchange section 732 and the liquid outlet heat exchange section 733.

[0108] Optionally, the liquid inlet heat exchange section 732 is provided with multiple parallel liquid inlet heat exchange channels 736, and the liquid outlet heat exchange section 733 is provided with multiple parallel liquid outlet heat exchange channels 737. Furthermore, the liquid inlet heat exchange section 732 is provided for at least one battery cell assembly 9, and the liquid outlet heat exchange section 733 is provided for at least one battery cell assembly 9.

[0109] The liquid inlet heat exchange section 732 includes a first plate 738 and a second plate 739 disposed opposite each other along a first direction X. The second plate 739 is located on the side of the first plate 738 facing away from the battery cell 6. A heat exchange groove 708 is provided on the surface of the second plate 739 facing the first plate 738. The first plate 738 and the second plate 739 are sealed together, forming a liquid inlet heat exchange channel 736 at the heat exchange groove 708. The liquid outlet heat exchange section 733 includes a third plate 740 and a fourth plate 741 disposed opposite each other along a first direction X. The fourth plate 741 is located on the side of the third plate 740 facing away from the battery cell 6. A heat exchange groove 708 is provided on the surface of the fourth plate 741 facing the third plate 740. The third plate 740 and the fourth plate 741 are sealed together, forming a liquid outlet heat exchange channel 737 at the heat exchange groove 708.

[0110] In the above structure, the heat exchange medium enters the liquid inlet heat exchange section 732 through the liquid inlet 734, then enters the current collector 701, and then enters the liquid inlet channel 711 of the first heat exchange section 702 from the current collector 701. Subsequently, it enters the liquid outlet channel 712 of the first heat exchange section 702 through the connecting channel 716. Finally, it flows from the liquid outlet channel 712 into the liquid collecting channel 710 of the current collector 701, and finally flows through the liquid collecting channel 710 into the liquid outlet heat exchange channel 737 of the liquid outlet heat exchange section 733, and flows out from the liquid outlet 735, forming a circulating heat exchange path to exchange heat with multiple battery cell modules 9.

[0111] like Figure 8 As shown, the current collector 701 is provided with a total inlet 742 and a total outlet 743. Both the total inlet 742 and the total outlet 743 open towards the first direction X, and are located on the side of the current collector 701 opposite to the first heat exchange section 702. The heat exchange medium enters the liquid supply channel 709 of the current collector 701 through the total inlet 742, and then sequentially enters the liquid inlet channels 711 of multiple first heat exchange sections 702 from the current collector 701. Subsequently, it enters the liquid outlet channel 712 of the first heat exchange section 702 through the connecting channel 716. Then, it flows from the liquid outlet channel 712 into the liquid collection channel 710 of the current collector 701. Finally, it flows out through the total outlet 743 of the liquid collection channel 710, forming a circulating heat exchange path for heat exchange of multiple battery cell modules 9.

[0112] In the above structure, the current collector 701 is connected to multiple parallel first heat exchange sections 702 through their flow channels, forming an orderly flow path that ensures the consistency and uniformity of heat exchange for each battery cell assembly 9. The clear flow path and reasonable resistance distribution of the medium help improve the circulation efficiency of the heat exchange medium and enhance the overall heat dissipation or heating performance. In particular, the new heat exchange medium received from the main inlet 742 can directly enter the heat exchange flow channel 705 of each first heat exchange section 702, minimizing the temperature difference between the multiple first heat exchange sections 702, improving heat exchange efficiency, and enhancing the temperature uniformity of the battery cell assembly 9.

[0113] like Figure 9 As shown, in some embodiments of this application, the first heat exchange section 702 is further provided with a first through hole 717 and a second through hole 718. The first through hole 717 communicates with the liquid inlet channel 711 and is provided corresponding to the liquid supply hole 713 on the collector 701. The second through hole 718 communicates with the liquid outlet channel 712 and is provided corresponding to the liquid collection hole 714 on the collector 701. The first through hole 717 and the second through hole 718 are located on opposite sides of the first heat exchange section 702 along the third direction Z. Exemplarily, the first through hole 717 and the second through hole 718 are through-hole structures that penetrate the sealing plate 704. The sealing plate 704 and the collector 701 are sealed together, with only the first through hole 717 communicating with the liquid supply hole 713 and the second through hole 718 communicating with the liquid collection hole 714.

[0114] The aforementioned structure, by staggering the inlet and return liquid through-holes along the Z-direction, avoids flow interference between the supply and collection liquid flows within the collector 701. This reduces local flow resistance within the collector 701, improves flow distribution uniformity, and reduces pumping energy consumption. Furthermore, spatially separating the two main stress concentration points prevents excessive local superposition of thermal stress generated during brazing heating and cooling, improves the structural integrity of the interface between the collector 701 and the first heat exchange section 702, reduces the risk of welding deformation and cracking, and enhances the long-term reliability and fatigue life of the connection joint under vibration, thermal cycling, and other conditions.

[0115] Optionally, the first through hole 717 and the second through hole 718 are located on opposite sides of the collector 701 along the second direction Y, respectively, and the first through hole 717 and the second through hole 718 correspond to the liquid supply channel 709 and the liquid collection channel 710, respectively. By placing the liquid inlet and return through holes on opposite sides of the collector 701 along the second direction Y, the intersection and mutual interference of the liquid supply flow and the liquid return flow inside the collector 701 can be effectively avoided, which is beneficial to maintaining the stability of the flow field and reducing local eddies and flow losses.

[0116] In some embodiments of this application, the first heat exchange section 702 is further provided with a connecting channel 716, one end of which is connected to the liquid inlet channel 711 and the other end is connected to the liquid outlet channel 712.

[0117] The above structure connects the internal flow channels through the connecting channel 716, achieving a series connection, which simplifies the structure of the internal flow channels and improves the uniformity of the heat exchange medium flow velocity within the flow channels.

[0118] In some embodiments of this application, there are multiple liquid inlet channels 711, and the multiple liquid inlet channels 711 are connected in parallel in sequence.

[0119] The aforementioned structure uses multiple parallel inlet channels 711 to distribute the heat exchange medium, allowing each branch to cool a smaller local area of ​​the battery. This shortens the heat transfer path from the channel to the battery body and reduces thermal resistance. The multiple parallel channels ensure effective thermal management across multiple areas of the battery device 2, improving the uniformity of temperature distribution among the individual battery cells 6. This avoids localized overheating or overcooling, reduces the risk of efficiency reduction due to individual battery cells exceeding temperature thresholds, and ultimately improves the overall energy utilization efficiency of the battery system.

[0120] In some embodiments of this application, there are multiple liquid outlet channels 712, which are connected in parallel sequentially. It is understood that multiple parallel liquid outlet channels 712 are provided inside the same first heat exchange section 702.

[0121] The aforementioned structure, with multiple parallel outlet channels 712, provides a low-resistance collection path for the heated heat exchange medium. These channels can quickly and smoothly discharge the fluid from each branch. The use of multiple parallel outlet channels 712, symmetrical to the inlet, achieves a symmetrical channel cross-section design. The heat exchange medium smoothly flows from multiple small-section channels into the collecting channel 710 of the collector 701, avoiding kinetic energy dissipation and eddy current losses caused by sudden and drastic expansion of the flow cross-section. The parallel outlet channels 712 work in conjunction with the parallel inlet channels 711, jointly enhancing the pressure balance of the entire parallel channel network from both the inlet and outlet ends, further improving the temperature uniformity of the battery device 2.

[0122] In some embodiments of this application, there are multiple first heat exchange sections 702, which are arranged sequentially along the third direction Z and spaced apart from each other.

[0123] Optionally, the number of first heat exchange sections 702 corresponds to the number of battery cell assemblies 9. Each battery cell assembly 9 includes multiple battery cells 6 arranged sequentially along the second direction Y. Each battery cell assembly 9 has at least one first heat exchange section 702. The multiple first heat exchange sections 702 can effectively cover all battery cells 6, achieving balanced and efficient heat exchange for each battery cell 6.

[0124] The aforementioned structure employs multiple independent first heat exchange sections 702 arranged in parallel, with each shorter first heat exchange section 702 responsible for cooling a segment of the module. All heat exchange sections receive low-temperature heat exchange medium from the main liquid supply channel 709 in parallel via the current collector 701. Each battery segment can be heated by a heat exchange medium at a substantially uniform temperature, reducing the axial temperature gradient caused by excessively long channels and improving the temperature uniformity of the large-size battery cell assembly 9. Furthermore, the multiple first heat exchange sections 702 operate independently, so even if a single first heat exchange section 702 leaks due to accidental damage (such as puncture), only the damaged first heat exchange section 702 can be isolated or replaced. This reduces the risk of the entire battery device 2's thermal management system being paralyzed due to a single point of failure, lowers maintenance costs and complexity, and improves the maintenance efficiency of the heat exchange assembly 7.

[0125] like Figure 8 as well as Figure 9 As shown, in some embodiments of this application, the heat exchange assembly 7 further includes a second heat exchange section 715. The second heat exchange section 715 is provided with at least one unidirectional flow channel 719, which extends along the second direction Y. The second heat exchange section 715 is located on the side of the first heat exchange section along the third direction Z. This structure has multiple parallel and independent unidirectional flow channels 719 extending along the second direction Y, which can achieve a large heat exchange area and uniform fluid distribution in a limited space, thus helping to improve heat exchange efficiency and structural strength.

[0126] For example, the second heat exchange section 715 adopts a multi-channel structure similar to a harmonica tube, typically manufactured integrally through an aluminum extrusion process. Aluminum extrusion refers to the aluminum alloy extrusion molding process, a widely used processing method for manufacturing long, strip-shaped metal profiles with uniform cross-sectional shapes. By applying enormous pressure, heated and softened aluminum billets are forced through a die of a specific shape, thus obtaining a continuous profile consistent with the die opening shape. Multiple complex channels can be integrally formed in a single extrusion, eliminating the need for welding or splicing. This avoids leakage risks and ensures the strength and reliability of the structure. The extruded heat exchange channels 705 have a good inner surface quality and low flow resistance, which is conducive to smooth flow of the heat exchange medium and efficient heat exchange.

[0127] The aforementioned structure, by adding a second heat exchange section 715, increases the total heat exchange area between the heat exchange assembly 7 and the battery cell 6. This enables it to handle higher charge / discharge rates, remove or transfer heat more quickly, effectively control battery temperature, prevent thermal runaway, and meet the thermal requirements of higher-performance battery systems. Furthermore, the unidirectional heat exchange channel 705 simplifies the structure and better accommodates the space between the battery cell 6 and the housing 5, further reducing the space occupied by the heat exchange assembly 7 and improving the internal space utilization of the housing 5.

[0128] In some embodiments of this application, there are two second heat exchange sections 715, which are connected to the two ends of the current collector 701 along the third direction Z. The first heat exchange section 702 is located between the two second heat exchange sections 715. In this structure, the unidirectional flow channels 719 of the two second heat exchange sections 715 can serve as the heat exchange medium input channel and output channel, respectively, and can also themselves provide heat exchange for the battery cell 6. Furthermore, the design of the unidirectional flow channel 719 is simple and easy to mold.

[0129] like Figures 10 to 13 As shown, in some embodiments of this application, the current collector 701 is provided with a third flow port 720, and the second heat exchange section 715 is provided with a fourth flow port 721 corresponding to the third flow port 720. The fourth flow port 721 is connected to the third flow port 720. The third flow port 720 refers to a through hole formed on the current collector 701, and the fourth flow port 721 refers to the opening at the end of the heat exchange channel 705 in the second heat exchange section 715.

[0130] Optionally, there may be one third flow port 720 and multiple fourth flow ports 721, with each fourth flow port 721 corresponding to a heat exchange channel 705. Each second heat exchange section 715 includes multiple fourth flow ports 721, and these multiple fourth flow ports 721 are simultaneously connected to one of the third flow ports 720.

[0131] The aforementioned structure establishes a structural and fluid connection between the third flow port 720 and the fourth flow port 721, linking the current collector 701 and the second heat exchanger 715. A permanent seal is achieved through processes such as brazing, allowing the heat exchange medium to flow seamlessly between the distribution channel of the current collector 701 and the unidirectional flow channel 719 of the second heat exchanger 715. Furthermore, this connection enhances the overall structural rigidity, effectively manages thermal stress, and improves the overall heat exchange assembly 7's resistance to bending and torsional loads.

[0132] like Figure 4 , Figure 14 as well as Figure 15As shown, in some embodiments of this application, the third flow port 720 opens towards the second direction Y, and the fourth flow port 721 is provided at the end of the second heat exchange section 715 along the second direction Y. The end of the second heat exchange section 715 is inserted into the third flow port 720 of the current collector 701, so that the fourth flow port 721 is connected to the third flow port 720.

[0133] During assembly, the second heat exchanger 715 is simply moved along the second direction Y (its length direction) and directly inserted into the current collector 701 to complete the initial positioning and docking. No complex angle adjustments or rotations are required; linear movement in a single direction is sufficient, facilitating automated installation. Furthermore, this structure effectively resists shear forces and vibrations from the third direction Z, reducing the risk of fatigue fracture at the connection due to vibration, making the connection between the second heat exchanger 715 and the current collector 701 more stable, and further enhancing the rigidity and integrity of the entire integrated module. Finally, compared to planar butt welding, this socket-type weld has a longer weld length, can withstand higher burst pressure and fatigue stress, and reduces the risk of leakage at the connection point.

[0134] Optionally, of the two second heat exchange sections 715, one is provided with a total liquid inlet, which is located at the end away from the collector 701; the other is provided with a total liquid outlet 735, which is also located at the end away from the collector 701.

[0135] In the above structure, the two second heat exchange sections 715 serve as both input and output channels for the heat exchange medium and also provide heat exchange for the battery cells 6, reducing the space occupied by the heat exchange assembly 7 and improving its heat exchange efficiency. Furthermore, the main liquid inlet and main liquid outlet 735 are located at the far ends of the two independent second heat exchange sections 715, which helps to achieve more uniform medium distribution and collection, reduces mutual interference between flow paths, and improves overall heat exchange efficiency. The arrangement of the inlet and outlet away from the current collector 701 reduces the number of complex connecting pipes and welds, lowers potential leakage points, and improves system sealing reliability and maintenance convenience. Independent inlet and outlet paths help maintain flow resistance balance, ensuring uniform flow distribution among the multiple first heat exchange sections 702 and second heat exchange sections 715, thereby improving the consistency and temperature uniformity of the battery cells 6 temperature control.

[0136] The heat exchange medium enters the second heat exchange section 715 through the main liquid inlet, then enters the current collector 701, and then enters the liquid inlet channel 711 of the first heat exchange section 702 from the current collector 701. Subsequently, it enters the liquid outlet channel 712 of the first heat exchange section 702 through the connecting channel 716. Finally, it flows from the liquid outlet channel 712 into the liquid collecting channel 710 of the current collector 701, and finally flows through the liquid collecting channel into the heat exchange channel 705 of the second heat exchange section 715, and flows out from the main liquid outlet 735, forming a circulating heat exchange path to exchange heat with multiple battery cell modules 9.

[0137] In some embodiments of this application, the portion of the second heat exchange section 715 near the fourth flow port 721 is bent toward the direction of the battery cell 6 to form a bent portion 722.

[0138] Optionally, the bend 722 is formed at the end of the second heat exchange section 715 facing the current collector 701.

[0139] The bending structure has a number of practical functions: for example, firstly, it can effectively avoid other electrical components (such as BMS sampling lines, bus bundles or structural parts) inside the battery device 2, preventing mechanical interference during assembly or operation; secondly, it can reduce the installation distance between the second heat exchange section 715 and the current collector 701 along the first direction X, optimize the spatial layout, and improve the system integration and structural compactness.

[0140] The aforementioned structure reduces the ineffective space occupied by the thickness of the current collector 701, allowing the effective heat exchange surface of the second heat exchange section 715 to fit tightly against the surface of the battery cell 6, maximizing the use of the narrow space in the first direction X, and improving space utilization and energy density. The bending design ensures a tight, gapless contact between the main body of the second heat exchange section 715 and the battery cell 6, reducing contact thermal resistance. This helps improve the uniformity of the overall temperature field of the battery cell assembly 9, preventing overheating or overcooling of the battery cells 6 at the ends. In addition, compared to a sharp right-angle joint, the smooth bending transition reduces flow separation, lowers local flow resistance, and reduces eddy current generation. This allows the heat exchange medium to flow more smoothly when entering or leaving the second heat exchange section 715, reducing flow dead zones and pressure losses, and helping to maintain the stability of the system flow rate and heat exchange performance of the heat exchange assembly 7.

[0141] like Figures 13 to 15As shown, in some embodiments of this application, the current collector 701 includes a first current collector 723 and a second current collector 724. The first current collector 723 has a liquid supply channel 709 extending along a third direction Z. The second current collector 724 is connected to one side of the first current collector 723 along a second direction Y, and has a liquid collection channel 710 extending along a third direction Z. The first current collector 723 has a first end 725 and a second end 726 arranged opposite each other along the third direction Z. The second current collector 724 has a third end 727 and a fourth end 728 arranged opposite each other along the third direction Z. The first end 725 protrudes beyond the end face where the third end 727 is located in the third direction Z. The second heat exchange section 715 is connected to the first end 725. The first end 725 is provided with a liquid supply port of a collector 701. The second heat exchange section 715 is provided with a liquid supply port 730. The liquid supply port of the collector 701 is connected to the liquid supply port 730 of the heat exchange section.

[0142] Optionally, the first manifold 723 and the second manifold 724 are connected by welding. Alternatively, they can be manufactured using a one-piece molding process to form an integral structure. Welded connections offer advantages such as manufacturing flexibility and ease of later maintenance and replacement, making them suitable for scenarios with high requirements for manufacturing costs and process adaptability. The one-piece molding structure avoids the leakage risks that may exist in welds, resulting in higher overall strength and consistency, which helps improve the system's sealing performance and structural reliability, making it particularly suitable for applications with more stringent requirements for lightweight design, space utilization, and durability.

[0143] The aforementioned structure, by extending one end of the first manifold 723 in a Z-direction beyond the end face of the second manifold 724, creates an independent mounting platform for the liquid supply interface. This allows the heat exchange medium leading to the second heat exchange section 715 to be directly obtained from the main liquid supply pipe, resulting in the most stable flow rate and pressure. This makes the liquid supply circuit of the second heat exchange section 715 independent of the return system, allowing for independent design of the flow channel dimensions based on its heat exchange requirements, without being constrained by the space of the return flow channel. Furthermore, during assembly, welding tools can easily access and complete the welding operation at this interface, ensuring welding quality. This reduces the risk of welding failure caused by welding in confined spaces or with overlapping components, and also reduces the risk of sealing failure due to operational inconvenience.

[0144] In some embodiments of this application, there are two second heat exchange sections 715, with a first heat exchange section 702 located between the two second heat exchange sections 715. Optionally, there are multiple first heat exchange sections 702, each located between two second heat exchange sections 715. The two second heat exchange sections 715 are respectively connected to a first end 725 and a fourth end 728. The fourth end 728 protrudes from the end face of the second end 726 in the third direction Z. The fourth end 728 is provided with a liquid outlet port for a collector 701, and the second heat exchange section 715 connected to the fourth end 728 is provided with a heat exchange section liquid outlet port, which communicates with the liquid outlet port of the collector 701.

[0145] The aforementioned technical solution allows the two second heat exchange sections 715 located on the sides to achieve balanced flow and cooling effects, thereby improving the symmetry and uniformity of temperature on both sides of the battery cell assembly 9 in the third direction Z, effectively enhancing the consistency and cycle life of the entire battery device 2. Structurally, the two second heat exchange sections 715 are respectively connected to the protruding ends on both sides of the current collector 701 assembly. Together with the first heat exchange section 702 in the middle, they form a closed annular mechanical structure. This structure has high torsional and bending stiffness, enhancing the mechanical strength of the entire heat exchange assembly 7, effectively resisting vibration, impact, and stress generated by the expansion of the battery cell 6, and improving the structural safety and reliability of the entire battery device 2.

[0146] like Figure 9 As shown, in some embodiments of this application, the second heat exchange section 715 is provided with a fifth flow port 731 at one end along the second direction Y away from the third flow port 720. The fifth flow port 731 is used to connect the medium supply source, and the current collector 701 is connected to the end of the second heat exchange section 715 along the second direction Y away from the fifth flow port 731.

[0147] In the above structure, the flow and pressure of the two loops can be controlled independently without interference. This avoids the flow competition problems found in complex parallel networks. Since the second heat exchanger 715 has its own independent fifth flow port 731, if this component is damaged and needs replacement, only this independent branch can be shut down and disassembled without affecting the operation of the main loop of the first heat exchanger 702. This reduces maintenance costs and time, and improves the ease of maintenance of the heat exchanger assembly 7. Furthermore, the heat exchange medium does not need to first flow into the collector 701 for distribution before entering the second heat exchanger 715. Instead, it enters directly from the nearest fifth flow port 731, resulting in a shorter flow path and lower flow resistance.

[0148] In some embodiments of this application, the housing 5 includes a protective plate, the heat exchange assembly 7 is disposed between the battery cell 6 and the protective plate, and the heat exchange assembly 7 also includes a buffer member disposed between the heat exchange assembly 7 and the plate.

[0149] The aforementioned structure allows the buffer to absorb and dissipate energy through its own compression deformation when the battery device 2 is subjected to external impacts (such as collisions or drops) or internal battery expansion. It provides space for the battery's natural expansion during charge-discharge cycles and offers flexible restraint, preventing excessive compression of the battery by the rigid structure and extending battery life. Furthermore, the buffer layer effectively seals the interface between the heat exchange component 7 and the protective plate, preventing external moisture, dust, and other contaminants from entering the core area of ​​the battery device 2, thus improving the overall protective performance of the battery device 2.

[0150] like Figure 3 As shown, in some embodiments of this application, the first wall 601 is further provided with a pressure relief mechanism 26, and the first wall 601 is disposed opposite to the protective plate.

[0151] With the above-described structure, the heat exchange component 7 can cool down the material released by the pressure relief mechanism 26 in a timely manner, reducing the risk of secondary damage to other battery cells 6 after thermal runaway of the battery cell 6, and improving the operational stability of the battery cell assembly 9.

[0152] Optionally, the protective plate of the housing 5 is a bottom support plate, and the battery cell 6 is installed in an inverted direction, with its first wall 601 facing the bottom of the housing 5. This structure allows the high-temperature, high-pressure material ejected during thermal runaway of the battery cell 6 to be released downwards via the pressure relief mechanism 26. When the housing 5 is installed at the bottom of the vehicle 1, it effectively prevents high-temperature ejected material from impacting the upper passenger compartment, improving the safety of occupants and the overall vehicle safety protection level during vehicle 1 operation. Figure 2 As shown, in some embodiments of this application, the battery device 2 further includes a battery cell assembly 9 and an output electrode plate 8. The battery cell assembly 9 includes a plurality of battery cells 6 arranged sequentially along the second direction Y. The output electrode plate 8 is used to electrically connect the battery cell assembly 9 to an external structure. The output electrode plate 8 is located at the end of the first heat exchange section 702 away from the current collector 701 along the second direction Y.

[0153] The aforementioned structure achieves physical isolation between the electrical interface and the heat exchange medium interface, reducing the risk of short circuits caused by coolant leakage flowing onto high-voltage electrical connections. Simultaneously, it avoids potential electrochemical corrosion of electrical connectors by coolant vapor, ensuring long-term connection reliability. Furthermore, when multiple battery cell modules 9 are installed on the third direction Z, the electrical terminals of one module can be easily connected in series with the electrical terminals of another module, while the liquid-cooled terminals can also be connected in parallel, simplifying the overall internal layout of the battery pack.

[0154] like Figure 16 As shown, in some embodiments of this application, the projection of the first heat exchange section 702 along the first direction X covers at least a portion of the adjacent battery cells 6 to exchange heat with the adjacent battery cells 6.

[0155] The above structure utilizes the space between two adjacent battery cells 6 to arrange the first heat exchange section 702, which can further utilize the space inside the housing 5 and make it fit against the shoulder of the battery cell 6 for heat exchange. This can quickly remove the heat from the battery cell 6 and improve the heat exchange efficiency. At the same time, the space in this position is regular, which can facilitate the setting of the first heat exchange section 702 and improve the convenience of installation and maintenance.

[0156] In some alternative embodiments, the battery device 2 includes a housing 5, a battery cell 6, and a heat exchange assembly 7. The housing 5 has a receiving space 5c, and the battery cell 6 is disposed in the receiving space 5c. The battery cell 6 includes a first wall 601, on which electrode terminals 25 are provided. The heat exchange assembly 7 is disposed between the housing 5 and the first wall 601. The heat exchange assembly 7 includes a current collector 701 and a first heat exchange section 702. The heat exchange assembly 7 and the battery cell 6 are arranged along a first direction X. The current collector 701 is connected to one side of the first heat exchange section 702 along a second direction Y. The first direction X and the second direction Y are perpendicular to each other. The first heat exchange section 702 includes a flow channel plate 703 and a sealing plate 704 stacked along the first direction X. A heat exchange flow channel 705 extending along the second direction Y is formed between the flow channel plate 703 and the sealing plate 704. The current collector 701 has a first flow port 706 facing the first direction X, and the first heat exchange section 702 has a second flow port 707 corresponding to the first flow port 706. A flow channel plate 703 is located on the side of the sealing plate 704 away from the battery cell 6. The surface of the flow channel plate 703 facing the sealing plate 704 has a recessed heat exchange groove 708. The sealing plate 704 covers and seals the heat exchange groove 708 to jointly form a heat exchange flow channel 705 extending along the second direction Y. The current collector 701 is located on the side of the sealing plate 704 away from the flow channel plate 703, and the sealing plate 704 is connected to the current collector 701 by brazing. The current collector 701 has a liquid supply channel 709 and a liquid collection channel 710 extending along the third direction Z. The liquid supply channel 709 and the liquid collection channel 710 are independent of each other within the current collector 701 and are arranged sequentially along the second direction Y. The third direction Z is perpendicular to both the second direction Y and the first direction X. The collector 701 is also provided with a liquid supply hole 713 and a liquid collection hole 714. The liquid supply hole 713 communicates with the liquid supply channel 709, and the liquid collection hole 714 communicates with the liquid collection channel 710. The first heat exchange section 702 is provided with an inlet channel 711 and an outlet channel 712 arranged sequentially along the third direction Z. Both the inlet channel 711 and the outlet channel 712 extend along the second direction Y. The extension length of the inlet channel 711 along the second direction Y is L1, and the extension length of the outlet channel 712 along the second direction Y is L2, where L1 > L2. The first heat exchange section 702 is also provided with a first through hole 717 and a second through hole 718. The first through hole 717 communicates with the inlet channel 711 and is corresponding to the liquid supply hole 713 on the collector 701. The second through hole 718 communicates with the outlet channel 712 and is corresponding to the liquid collection hole 714 on the collector 701. The first through hole 717 and the second through hole 718 are located on opposite sides of the first heat exchange section 702 along the third direction Z. The first heat exchange section 702 also includes a connecting channel 716, one end of which is connected to the liquid inlet channel 711, and the other end to the liquid outlet channel 712. There are multiple liquid inlet channels 711, which are connected in parallel in sequence.There are multiple liquid outlet channels 712, which are connected in parallel in sequence. There are multiple first heat exchange units 702, which are arranged in sequence along the third direction Z and spaced apart from each other.

[0157] like Figure 8 As shown, the current collector 701 is provided with a total inlet 742 and a total outlet 743. The heat exchange medium enters the liquid supply channel 709 of the current collector 701 through the total inlet 742, and then sequentially enters the liquid inlet channels 711 of multiple first heat exchange sections 702 from the current collector 701. Subsequently, it enters the liquid outlet channel 712 of the first heat exchange section 702 through the connecting channel 716. Then, it flows from the liquid outlet channel 712 into the liquid collection channel 710 of the current collector 701. Finally, it flows out through the total outlet 743 of the liquid collection channel 710, forming a circulating heat exchange path to exchange heat with multiple battery cell modules 9.

[0158] In some alternative embodiments, the battery device 2 includes a housing 5, a battery cell 6, and a heat exchange assembly 7. The housing 5 has a receiving space 5c, and the battery cell 6 is disposed in the receiving space 5c. The battery cell 6 includes a first wall 601, on which electrode terminals 25 are provided. The heat exchange assembly 7 is disposed between the housing 5 and the first wall 601. The heat exchange assembly 7 includes a current collector 701 and a first heat exchange section 702. The heat exchange assembly 7 and the battery cell 6 are arranged along a first direction X. The current collector 701 is connected to one side of the first heat exchange section 702 along a second direction Y. The first direction X and the second direction Y are perpendicular to each other. The first heat exchange section 702 includes a flow channel plate 703 and a sealing plate 704 stacked along the first direction X. A heat exchange flow channel 705 extending along the second direction Y is formed between the flow channel plate 703 and the sealing plate 704. The current collector 701 has a first flow port 706 facing the first direction X, and the first heat exchange section 702 has a second flow port 707 corresponding to the first flow port 706. A flow channel plate 703 is located on the side of the sealing plate 704 away from the battery cell 6. The surface of the flow channel plate 703 facing the sealing plate 704 has a recessed heat exchange groove 708. The sealing plate 704 covers and seals the heat exchange groove 708 to jointly form a heat exchange flow channel 705 extending along the second direction Y. The current collector 701 is located on the side of the sealing plate 704 away from the flow channel plate 703, and the sealing plate 704 is connected to the current collector 701 by brazing. The current collector 701 has a liquid supply channel 709 and a liquid collection channel 710 extending along the third direction Z. The liquid supply channel 709 and the liquid collection channel 710 are independent of each other within the current collector 701 and are arranged sequentially along the second direction Y. The third direction Z is perpendicular to both the second direction Y and the first direction X. The collector 701 is also provided with a liquid supply hole 713 and a liquid collection hole 714. The liquid supply hole 713 communicates with the liquid supply channel 709, and the liquid collection hole 714 communicates with the liquid collection channel 710. The first heat exchange section 702 is provided with an inlet channel 711 and an outlet channel 712 arranged sequentially along the third direction Z. Both the inlet channel 711 and the outlet channel 712 extend along the second direction Y. The extension length of the inlet channel 711 along the second direction Y is L1, and the extension length of the outlet channel 712 along the second direction Y is L2, where L1 > L2. The first heat exchange section 702 is also provided with a first through hole 717 and a second through hole 718. The first through hole 717 communicates with the inlet channel 711 and is corresponding to the liquid supply hole 713 on the collector 701. The second through hole 718 communicates with the outlet channel 712 and is corresponding to the liquid collection hole 714 on the collector 701. The first through hole 717 and the second through hole 718 are located on opposite sides of the first heat exchange section 702 along the third direction Z. The first heat exchange section 702 also includes a connecting channel 716, one end of which is connected to the liquid inlet channel 711, and the other end to the liquid outlet channel 712. There are multiple liquid inlet channels 711, which are connected in parallel in sequence.There are multiple liquid outlet channels 712, which are connected in parallel in sequence. There are multiple first heat exchange units 702, which are arranged in sequence along the third direction Z and spaced apart from each other.

[0159] Please continue to refer to this. Figure 6 In some optional embodiments, the heat exchange assembly 7 further includes an inlet heat exchange section 732 and an outlet heat exchange section 733. The inlet heat exchange section 732 and the outlet heat exchange section 733 are respectively connected to the collector 701.

[0160] The liquid inlet heat exchange section 732 is provided with a liquid inlet heat exchange channel 736 extending along the second direction Y, and the liquid inlet heat exchange channel 736 is connected to the liquid supply channel 709. The liquid inlet heat exchange section 732 is provided with a liquid inlet 734 for introducing heat exchange medium into the liquid inlet heat exchange section 732. Furthermore, at least a portion of the liquid inlet heat exchange section 732 is in contact with the first wall 601 of the battery cell 6 for heat exchange.

[0161] The liquid outlet heat exchange section 733 is provided with an inlet / outlet heat exchange channel 705 extending along the second direction Y, and the liquid outlet heat exchange channel 737 communicates with the liquid collection channel 710. The liquid outlet heat exchange section 733 is provided with an outlet port 735 for discharging the heat exchange medium inside the liquid outlet heat exchange section 733. Furthermore, at least a portion of the liquid outlet heat exchange section 733 is in contact with the first wall 601 of the battery cell 6 for heat exchange.

[0162] Optionally, the liquid inlet 734 is located at one end of the liquid inlet heat exchange section 732 away from the collector 701 along the second direction Y, and the liquid outlet 735 is located at one end of the liquid outlet heat exchange section 733 away from the collector 701 along the second direction Y.

[0163] Optionally, the liquid inlet heat exchange section 732 and the liquid outlet heat exchange section 733 are spaced apart along the third direction Z, and the first heat exchange section 702 is disposed between the liquid inlet heat exchange section 732 and the liquid outlet heat exchange section 733.

[0164] Optionally, the liquid inlet heat exchange section 732 is provided with multiple parallel liquid inlet heat exchange channels 736, and the liquid outlet heat exchange section 733 is provided with multiple parallel liquid outlet heat exchange channels 737. Furthermore, the liquid inlet heat exchange section 732 is provided for at least one battery cell assembly 9, and the liquid outlet heat exchange section 733 is provided for at least one battery cell assembly 9.

[0165] The liquid inlet heat exchange section 732 includes a first plate 738 and a second plate 739 disposed opposite each other along a first direction X. The second plate 739 is located on the side of the first plate 738 facing away from the battery cell 6. A heat exchange groove 708 is provided on the surface of the second plate 739 facing the first plate 738. The first plate 738 and the second plate 739 are sealed together, forming a liquid inlet heat exchange channel 736 at the heat exchange groove 708. The liquid outlet heat exchange section 733 includes a third plate 740 and a fourth plate 741 disposed opposite each other along a third direction Z. The fourth plate 741 is located on the side of the third plate 740 facing away from the battery cell 6. A heat exchange groove 708 is provided on the surface of the fourth plate 741 facing the third plate 740. The third plate 740 and the fourth plate 741 are sealed together, forming a liquid outlet heat exchange channel 737 at the heat exchange groove 708.

[0166] In the above structure, the heat exchange medium enters the liquid inlet heat exchange section 732 through the liquid inlet 734, then enters the current collector 701, and then enters the liquid inlet channel 711 of the first heat exchange section 702 from the current collector 701. Subsequently, it enters the liquid outlet channel 712 of the first heat exchange section 702 through the connecting channel 716. Finally, it flows from the liquid outlet channel 712 into the liquid collecting channel 710 of the current collector 701, and finally flows through the liquid collecting channel 710 into the liquid outlet heat exchange channel 737 of the liquid outlet heat exchange section 733, and flows out from the liquid outlet 735, forming a circulating heat exchange path to exchange heat with multiple battery cell modules 9.

[0167] In some alternative embodiments, the battery device 2 includes a housing 5, a battery cell 6, and a heat exchange assembly 7. The housing 5 has a receiving space 5c, and the battery cell 6 is disposed in the receiving space 5c. The battery cell 6 includes a first wall 601, on which electrode terminals 25 are provided. The heat exchange assembly 7 is disposed between the housing 5 and the first wall 601. The heat exchange assembly 7 includes a current collector 701 and a first heat exchange section 702. The heat exchange assembly 7 and the battery cell 6 are arranged along a first direction X. The current collector 701 is connected to one side of the first heat exchange section 702 along a second direction Y. The first direction X and the second direction Y are perpendicular to each other. The first heat exchange section 702 includes a flow channel plate 703 and a sealing plate 704 stacked along the first direction X. A heat exchange flow channel 705 extending along the second direction Y is formed between the flow channel plate 703 and the sealing plate 704. The current collector 701 has a first flow port 706 facing the first direction X, and the first heat exchange section 702 has a second flow port 707 corresponding to the first flow port 706. A flow channel plate 703 is located on the side of the sealing plate 704 away from the battery cell 6. The surface of the flow channel plate 703 facing the sealing plate 704 has a recessed heat exchange groove 708. The sealing plate 704 covers and seals the heat exchange groove 708 to jointly form a heat exchange flow channel 705 extending along the second direction Y. The current collector 701 is located on the side of the sealing plate 704 away from the flow channel plate 703, and the sealing plate 704 is connected to the current collector 701 by brazing. The current collector 701 has a liquid supply channel 709 and a liquid collection channel 710 extending along the third direction Z. The liquid supply channel 709 and the liquid collection channel 710 are independent of each other within the current collector 701 and are arranged sequentially along the second direction Y. The third direction Z is perpendicular to both the second direction Y and the first direction X. The collector 701 is also provided with a liquid supply hole 713 and a liquid collection hole 714. The liquid supply hole 713 communicates with the liquid supply channel 709, and the liquid collection hole 714 communicates with the liquid collection channel 710. The first heat exchange section 702 is provided with an inlet channel 711 and an outlet channel 712 arranged sequentially along the third direction Z. Both the inlet channel 711 and the outlet channel 712 extend along the second direction Y. The extension length of the inlet channel 711 along the second direction Y is L1, and the extension length of the outlet channel 712 along the second direction Y is L2, where L1 > L2. The first heat exchange section 702 is also provided with a first through hole 717 and a second through hole 718. The first through hole 717 communicates with the inlet channel 711 and is corresponding to the liquid supply hole 713 on the collector 701. The second through hole 718 communicates with the outlet channel 712 and is corresponding to the liquid collection hole 714 on the collector 701. The first through hole 717 and the second through hole 718 are located on opposite sides of the first heat exchange section 702 along the third direction Z. The first heat exchange section 702 also includes a connecting channel 716, one end of which is connected to the liquid inlet channel 711, and the other end to the liquid outlet channel 712. There are multiple liquid inlet channels 711, which are connected in parallel in sequence.There are multiple liquid outlet channels 712, which are connected in parallel in sequence. There are multiple first heat exchange units 702, which are arranged in sequence along the third direction Z and spaced apart from each other.

[0168] The heat exchange assembly 7 also includes a second heat exchange section 715. The second heat exchange section 715 has at least one unidirectional flow channel 719 extending along a second direction Y. The second heat exchange section 715 is located on the side of the first heat exchange section along a third direction Z. There are two second heat exchange sections 715, connected to the two ends of the collector 701 along the third direction Z. The first heat exchange section 702 is located between the two second heat exchange sections 715. The collector 701 has a third flow port 720, and the second heat exchange section 715 has a fourth flow port 721 corresponding to the third flow port 720. The fourth flow port 721 communicates with the third flow port 720. The third flow port 720 refers to a through hole formed on the collector 701, and the fourth flow port 721 refers to the opening at the end of the heat exchange channel 705 in the second heat exchange section 715. The third flow port 720 opens towards the second direction Y, and the fourth flow port 721 is located at the end of the second heat exchange section 715 along the second direction Y. The end of the second heat exchange section 715 is inserted into the third flow port 720 of the current collector 701, so that the fourth flow port 721 is connected to the third flow port 720. The portion of the second heat exchange section 715 near the fourth flow port 721 is bent towards the direction closer to the battery cell 6, forming a bent portion 722. The current collector 701 includes a first current collector pipe 723 and a second current collector pipe 724. The first current collector pipe 723 has a liquid supply channel 709 extending along the third direction Z, and the second current collector pipe 724 is connected to one side of the first current collector pipe 723 along the second direction Y, and the second current collector pipe 724 has a liquid collection channel 710 extending along the third direction Z. The first manifold 723 has a first end 725 and a second end 726 arranged opposite each other along the third direction Z. The second manifold 724 has a third end 727 and a fourth end 728 arranged opposite each other along the third direction Z. The first end 725 protrudes from the end face where the third end 727 is located in the third direction Z. The second heat exchange section 715 is connected to the first end 725. The first end 725 is provided with a liquid supply port for a current collector 701. The second heat exchange section 715 is provided with a liquid supply port 730 for the heat exchange section. The liquid supply port of the current collector 701 is connected to the liquid supply port 730 for the heat exchange section. The second heat exchange section 715 has a fifth port 731 at the end away from the third port 720 along the second direction Y. The fifth port 731 is used to connect a medium supply source. The current collector 701 is connected to the end of the second heat exchange section 715 away from the fifth port 731 along the second direction Y.

[0169] Optionally, of the two second heat exchange sections 715, one is provided with a total liquid inlet, which is located at the end away from the collector 701; the other is provided with a total liquid outlet 735, which is also located at the end away from the collector 701.

[0170] In the above structure, the heat exchange medium enters the second heat exchange section 715 through the main liquid inlet, then enters the current collector 701, and then enters the liquid inlet channel 711 of the first heat exchange section 702 from the current collector 701. Subsequently, it enters the liquid outlet channel 712 of the first heat exchange section 702 through the connecting channel 716. Finally, it flows from the liquid outlet channel 712 into the liquid collecting channel 710 of the current collector 701, and finally flows into the heat exchange channel 705 of the second heat exchange section 715 through the liquid collecting channel, and flows out from the main liquid outlet 735, forming a circulating heat exchange path to exchange heat with multiple battery cell modules 9.

[0171] An embodiment of this application also provides an electrical device that includes the battery device 2 described in the above embodiments. The battery device 2 is used to provide electrical energy. Since the electrical device includes the battery device 2, it also possesses the aforementioned technical effects, which will not be elaborated upon here.

[0172] 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 container has storage space; A battery cell is disposed in the receiving space, the battery cell including a first wall, and electrode terminals are provided on the first wall; A heat exchange assembly is disposed between the housing and the first wall. The heat exchange assembly includes a current collector and a first heat exchange section. The heat exchange assembly and the battery cell are arranged along a first direction. The current collector is connected to one side of the first heat exchange section along a second direction. The first direction and the second direction are perpendicular to each other. The first heat exchange section includes a flow channel plate and a sealing plate stacked along the first direction. A heat exchange flow channel extending along the second direction is formed between the flow channel plate and the sealing plate. The current collector has a first flow port facing the first direction. The first heat exchange section has a second flow port corresponding to the first flow port.

2. The battery device according to claim 1, characterized in that, The flow channel plate is located on the side of the sealing plate away from the battery cell. The surface of the flow channel plate facing the sealing plate has a concave heat exchange groove. The sealing plate covers and seals the heat exchange groove to form the heat exchange flow channel extending along the second direction.

3. The battery device according to claim 1, characterized in that, The current collector is located on the side of the sealing plate opposite to the flow channel plate, and the sealing plate and the current collector are connected by brazing.

4. The battery device according to any one of claims 1-3, characterized in that, The collector is provided with a liquid supply channel and a liquid collection channel extending along a third direction. The liquid supply channel and the liquid collection channel are independent of each other in the collector and are arranged sequentially along the second direction. The third direction is perpendicular to both the second direction and the first direction. The collector is also provided with a liquid supply hole and a liquid collection hole. The liquid supply hole is connected to the liquid supply channel, and the liquid collection hole is connected to the liquid collection channel.

5. The battery device according to claim 4, characterized in that, The first heat exchange section is provided with an inlet flow channel and an outlet flow channel arranged sequentially along the third direction. Both the inlet flow channel and the outlet flow channel extend along the second direction. The extension length of the inlet flow channel along the second direction is L1, and the extension length of the outlet flow channel along the second direction is L2, wherein L1 > L2.

6. The battery device according to claim 5, characterized in that, The first heat exchange section is further provided with a first through hole and a second through hole. The first through hole communicates with the liquid inlet channel and is configured corresponding to the liquid supply hole on the collector. The second through hole communicates with the liquid outlet channel and is configured corresponding to the liquid collection hole on the collector. The first through hole and the second through hole are located on opposite sides of the first heat exchange section along a third direction.

7. The battery device according to claim 5, characterized in that, The first heat exchange section is also provided with a connecting channel, one end of which is connected to the liquid inlet channel and the other end of which is connected to the liquid outlet channel.

8. The battery device according to claim 5, characterized in that, The number of liquid inlet channels is multiple, and the multiple liquid inlet channels are connected in parallel sequentially; and / or The number of liquid outlet channels is multiple, and the multiple liquid outlet channels are connected in parallel in sequence.

9. The battery device according to claim 5, characterized in that, There are multiple first heat exchange units, which are arranged sequentially along the third direction and spaced apart from each other.

10. The battery device according to any one of claims 5-9, characterized in that, The heat exchange assembly further includes a second heat exchange section, which has at least one unidirectional flow channel extending along the second direction. The second heat exchange section is located on one side of the first heat exchange section along the third direction.

11. The battery device according to claim 10, characterized in that, There are two second heat exchange sections, which are connected to the two ends of the current collector along the third direction, and the first heat exchange section is located between the two second heat exchange sections.

12. The battery device according to claim 10, characterized in that, The current collector is provided with a third flow port, and the second heat exchange section is provided with a fourth flow port corresponding to the third flow port. The fourth flow port is connected to the third flow port.

13. The battery device according to claim 12, characterized in that, The third flow port opens toward the second direction, and the fourth flow port is located at the end of the second heat exchange section along the second direction; the end of the second heat exchange section is inserted into the third flow port of the collector, so that the fourth flow port is connected to the third flow port.

14. The battery device according to claim 12, characterized in that, The portion of the second heat exchange section near the fourth flow port is bent toward the direction of the battery cell.

15. The battery device according to claim 10, characterized in that, The current collector includes: The first manifold has a liquid supply channel extending in the third direction; The second manifold is connected to the first manifold on one side along the second direction. The second manifold contains a liquid collection channel extending along the third direction. The first manifold has a first end and a second end disposed opposite to each other along the third direction. The second manifold has a third end and a fourth end disposed opposite to each other along the third direction. The first end protrudes upward from the end face where the third end is located on the third side. The second heat exchange section is connected to the first end, and the first end is provided with a liquid supply port for a collector. The second heat exchange section is provided with a liquid supply port for the heat exchange section, and the liquid supply port for the collector is connected to the liquid supply port for the heat exchange section.

16. The battery device according to claim 15, characterized in that, There are two second heat exchange sections, with the first heat exchange section located between the two second heat exchange sections. The two second heat exchange sections are respectively connected to the first end and the fourth end. The fourth end protrudes upward from the end face where the second end is located on the third side. The fourth end is provided with a liquid outlet of the collector, and the second heat exchange part connected to the fourth end is provided with a liquid outlet of the heat exchange part, and the liquid outlet of the collector is connected to the liquid outlet of the heat exchange part.

17. The battery device according to any one of claims 12-14, characterized in that, The second heat exchange section has a fifth flow port at one end along the second direction away from the third flow port. The fifth flow port is used to connect to the medium supply source. The current collector is connected to the end of the second heat exchange section along the second direction away from the fifth flow port.

18. The battery device according to any one of claims 1-17, characterized in that, The housing includes a protective plate, the heat exchange assembly is disposed between the battery cell and the protective plate, and the heat exchange assembly also includes a buffer component disposed between the heat exchange assembly and the plate.

19. The battery device according to claim 18, characterized in that, The first wall is also provided with a pressure relief mechanism, and the first wall is arranged opposite to the protective plate.

20. The battery device according to any one of claims 1-17, characterized in that, The battery device further includes a battery cell assembly and an output electrode plate. The battery cell assembly includes a plurality of battery cells arranged sequentially along the second direction. The output electrode plate is used to electrically connect the battery cell assembly to an external structure. The output electrode plate is located at the end of the first heat exchange section away from the current collector along the second direction.

21. The battery device according to any one of claims 1-17, characterized in that, The projection of the first heat exchange section along the first direction covers at least a portion of the adjacent battery cells to exchange heat with the adjacent battery cells.

22. An electrical appliance, characterized in that, The electrical equipment includes a battery device as described in any one of claims 1-21, the battery device being used to provide electrical energy.

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