Battery device, electric device, and energy storage device

Abstract

The application provides a battery device, a power consumption device and an energy storage device. The battery device comprises a battery box, a heat exchange assembly and a battery monomer assembly. The battery monomer assembly comprises a plurality of battery monomers arranged along a first direction. The battery monomer comprises a shell and an electrode terminal, and the shell is provided with the electrode terminal at least at one end along a second direction. The heat exchange assembly comprises a heat exchange element provided with a first medium communication port, a second medium communication port and a medium flow path, and the two ends of the medium flow path are communicated with the first medium communication port and the second medium communication port respectively. The heat exchange element is arranged at least at one side of the battery monomer assembly along a third direction. The medium flow path comprises a plurality of medium flow channels arranged at intervals along the second direction, each of the medium flow channels extends along the first direction and is communicated in sequence. In the flow direction from the first medium communication port to the second medium communication port, at least one of the plurality of medium flow channels closest to the electrode terminal in the second direction is located upstream of the other medium flow channels.

Description

Technical Field

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

[0002] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0003] During the use of a battery device, the individual battery cells generate heat. Excessive heat can negatively impact the battery's performance and lifespan. Furthermore, with increasingly demanding performance requirements for existing battery systems, the temperature difference between different areas of the battery device is a key performance indicator. Therefore, improving the heat exchange efficiency of heat exchange components while simultaneously enhancing the temperature uniformity of the battery device is a research focus in the industry. Summary of the Invention

[0004] To address the aforementioned technical problems, this application aims to provide a battery device, an electrical device, and an energy storage device that can improve the heat exchange efficiency of the heat exchange components while simultaneously enhancing the temperature uniformity of the battery device.

[0005] The embodiments of this application are implemented through the following technical solutions.

[0006] A first aspect of this application provides a battery device, including:

[0007] Battery housing;

[0008] At least one battery cell assembly, the battery cell assembly comprising a plurality of battery cells arranged along a first direction, the battery cell comprising a housing and at least one electrode terminal, the electrode terminal being disposed at at least one end of the housing along a second direction;

[0009] A heat exchange assembly includes at least one heat exchange element, the heat exchange element being provided with a first medium communication port, a second medium communication port, and a medium flow path, the two ends of the medium flow path being respectively connected to the first medium communication port and the second medium communication port, the heat exchange element being disposed on at least one side of the battery cell assembly along a third direction, the first direction, the second direction, and the third direction intersecting each other;

[0010] The medium flow path includes a plurality of medium flow channels spaced apart along the second direction. Each medium flow channel extends along the first direction and is connected in sequence. Along the flow direction from the first medium connection port to the second medium connection port, at least one of the plurality of medium flow channels that is closest to the electrode terminal in the second direction is located upstream of the other medium flow channels.

[0011] The battery device provided in this application embodiment has an electrode terminal disposed at at least one end of the housing along the second direction, and a heat exchanger disposed on at least one side of the battery cell assembly along the third direction. Therefore, the distance between the medium flow channel and the electrode terminal can be shortened to a certain extent, thereby improving the heat exchange efficiency of the heat exchanger to the electrode terminal. Since at least one medium flow channel closest to the electrode terminal in the second direction is located upstream of the other medium flow channels along the flow direction from the first medium connection port to the second medium connection port, during the flow of the heat exchange medium from the first medium connection port into the medium flow path and from the second medium connection port out of the medium flow path, the heat exchange medium will first flow through at least one medium flow channel closest to the electrode terminal in the second direction. Therefore, the heat exchange efficiency of the heat exchanger to the electrode terminal can be further improved, effectively reducing the electrode terminal temperature, reducing the risk of thermal runaway of the battery cell, shortening the temperature difference between battery cells, improving the temperature uniformity of the battery cell, and preventing overheating of the electrode terminal to a certain extent during the charging process of the battery cell, thereby improving the charging speed. Therefore, the battery device provided in this application embodiment can improve the temperature uniformity of the battery device while improving the heat exchange efficiency of the heat exchange assembly.

[0012] In some embodiments, at least a portion of the medium flow channel includes a plurality of sub-flow channels connected in parallel, the plurality of sub-flow channels being spaced apart along the second direction, and each of the sub-flow channels extending along the first direction.

[0013] Since the medium flow channel includes multiple sub-channels connected in parallel, the flow velocity of the heat exchange medium can be increased. Moreover, compared to the case where all sub-channels are connected in series, the flow path of the heat exchange medium can be shortened, thereby further improving the heat exchange efficiency.

[0014] In some embodiments, the electrode terminals include a first electrode terminal and a second electrode terminal.

[0015] The first electrode terminal is provided at the first end of the housing along the second direction, and the second electrode terminal is provided at the second end of the housing along the second direction.

[0016] Along the flow direction from the first medium connection port to the second medium connection port, the medium flow channel closest to the first electrode terminal in the second direction among the plurality of medium flow channels is located upstream of the other medium flow channels.

[0017] Along the flow direction from the second medium connection port to the first medium connection port, the medium flow channel that is closest to the second electrode terminal in the second direction among the plurality of medium flow channels is located upstream of the other medium flow channels.

[0018] Because, along the flow direction from the first medium connection port to the second medium connection port, the medium channel closest to the first electrode terminal in the second direction is located upstream of the other medium channels. In other words, the first medium connection port is connected to the medium channel closest to the first electrode terminal in the second direction. This means the heat exchange medium flows into the medium channel closest to the first electrode terminal first through the first medium connection port, which is beneficial for improving the heat exchange efficiency of the first electrode terminal. Similarly, because, along the flow direction from the second medium connection port to the first medium connection port, the medium channel closest to the second electrode terminal in the second direction is located upstream of the other medium channels. This means the second medium connection port is connected to the medium channel closest to the second electrode terminal in the second direction. This also means the heat exchange medium can flow into the medium channel closest to the second electrode terminal first through the second medium connection port, which is beneficial for improving the heat exchange efficiency of the second electrode terminal. Thus, to a certain extent, the distance between the medium channels and the first and second electrode terminals can be shortened, thereby improving the heat exchange efficiency of the heat exchanger for the first and second electrode terminals. Furthermore, by changing the flow direction of the heat exchange medium in the medium flow path, the heat exchange medium can flow into the medium flow channel closest to the first electrode terminal first through the first medium connection port, or into the medium flow channel closest to the second electrode terminal first through the second medium connection port. Therefore, the heat exchange efficiency of the heat exchange component to the first electrode terminal and the second electrode terminal can be further improved. While effectively reducing the temperature of the first electrode terminal and the second electrode terminal, the temperature difference between the first electrode terminal and the second electrode terminal is shortened, thereby further improving the temperature uniformity performance of the battery cell.

[0019] In some embodiments, the medium flow channel includes a first medium flow channel and a second medium flow channel.

[0020] In the second direction, the first dielectric channel is closest to the first electrode terminal compared to the other dielectric channels, and the second dielectric channel is closest to the second electrode terminal compared to the other dielectric channels.

[0021] The medium flow path further includes a connecting channel, which extends along a second direction, and the end of the first medium flow path away from the first medium connection port is directly connected to the end of the second medium flow path away from the second medium connection port through the connecting channel.

[0022] In the second direction, since the first medium flow channel is located at the first end of the heat exchanger and is mainly used for heat exchange of the first electrode terminal, and the second medium flow channel is located at the second end of the heat exchanger and is mainly used for heat exchange of the second electrode terminal, and there are no other medium flow channels between the first and second medium flow channels, it is beneficial to reduce the heat or cold loss of the heat exchange medium in other medium flow channels besides the first and second medium flow channels. This can further improve the heat exchange efficiency of the heat exchanger for the first and second electrode terminals, effectively reduce the temperature of the first and second electrode terminals, shorten the temperature difference between the first and second electrode terminals, and further improve the temperature uniformity of the battery cell. In addition, the flow path of the heat exchange medium can be further shortened, thereby further improving the heat exchange efficiency of the heat exchanger.

[0023] In some embodiments, the first medium communication port and the second medium communication port are located on the same side of the heat exchanger along the first direction.

[0024] The first medium communication port and the connecting flow channel are located on different sides of the heat exchanger along the first direction.

[0025] Since the first medium connection port and the connecting flow channel are located on different sides of the heat exchanger along the first direction, the heat exchange range of the heat exchanger can be increased while the flow path of the heat exchange system can be further simplified, thereby improving the structural compactness of the battery device.

[0026] In some embodiments, the heat exchanger includes a first region, a second region, and a third region arranged sequentially along the second direction.

[0027] The first medium flow channel is disposed in the first region, the second medium flow channel is disposed in the third region, and the second region has no medium flow channel.

[0028] The size of the second region in the first direction is greater than or equal to the size of the first region in the first direction, and is greater than or equal to the size of the third region in the first direction.

[0029] Since the second region does not have a medium flow channel, but the medium flow channels are concentrated in the first and third regions, it is beneficial to reduce the heat or cold loss of the heat exchange medium in other medium flow channels besides the first and second medium flow channels, thereby further improving the heat exchange efficiency of the heat exchanger to the first electrode terminal and the second electrode terminal.

[0030] In some embodiments, the ratio of the size of the second region in the second direction to the size of the heat exchanger in the second direction is in the range of 0.3 to 0.8.

[0031] While concentrating the medium flow channels in the first and third regions as much as possible, the first and third regions can also be made to have a certain size for setting up the medium flow channels, so as to improve the heat exchange efficiency of the heat exchanger to the first electrode terminal and the second electrode terminal.

[0032] In some embodiments, the electrode terminals include a first electrode terminal and a second electrode terminal, with the first electrode terminal disposed at a first end of the housing along the second direction, and the second electrode terminal disposed at a second end of the housing along the second direction.

[0033] The heat exchanger includes a first heat exchanger and a second heat exchanger, which are spaced apart along the second direction and located on the same side of the battery cell assembly along the third direction.

[0034] In the second direction, the first heat exchanger is closest to the first electrode terminal compared to the other heat exchangers, and the second heat exchanger is closest to the second electrode terminal compared to the other heat exchangers.

[0035] In the second direction, since the first heat exchanger is closest to the first electrode terminal compared to other heat exchangers, and the second heat exchanger is closest to the second electrode terminal compared to other heat exchangers, heat can be exchanged between the first and second electrode terminals respectively through the first and second heat exchangers, thereby further improving the heat exchange efficiency of the heat exchangers for the first and second electrode terminals.

[0036] In some embodiments, along the flow direction from the first medium connection port of the first heat exchanger to the second medium connection port of the first heat exchanger, the medium flow channel of the plurality of medium flow channels of the first heat exchanger that is closest to the first electrode terminal in the second direction is located upstream of the other medium flow channels of the first heat exchanger.

[0037] Along the flow direction from the first medium connection port of the second heat exchanger to the second medium connection port of the second heat exchanger, the medium flow channel of the plurality of medium flow channels of the second heat exchanger that is closest to the second electrode terminal in the second direction is located upstream of the other medium flow channels of the second heat exchanger.

[0038] Since the medium flow direction along the first medium connection port to the second medium connection port of the first heat exchanger is such that the medium flow channel closest to the first electrode terminal in the second direction among the multiple medium flow channels of the first heat exchanger is located upstream of the other medium flow channels of the first heat exchanger, that is, the first medium connection port of the first heat exchanger is connected to the medium flow channel of the first heat exchanger closest to the first electrode terminal in the second direction. In other words, the heat exchange medium flows into the medium flow channel of the first heat exchanger closest to the first electrode terminal first through the first medium connection port, which is beneficial to improving the heat exchange efficiency of the first heat exchanger to the first electrode terminal. Because, along the flow direction from the first medium connection port to the second medium connection port of the second heat exchanger, the medium flow channel closest to the second electrode terminal in the second direction among the multiple medium flow channels of the second heat exchanger is located upstream of the other medium flow channels of the second heat exchanger, that is, the first medium connection port of the second heat exchanger is connected to the medium flow channel of the second heat exchanger closest to the second electrode terminal in the second direction. In other words, the heat exchange medium can flow into the medium flow channel of the second heat exchanger closest to the second electrode terminal first through the first medium connection port of the second heat exchanger, which is beneficial to improving the heat exchange efficiency of the second heat exchanger to the second electrode terminal. In this way, the distance between the medium flow channel and the first and second electrode terminals can be shortened to a certain extent, thereby improving the heat exchange efficiency of the heat exchanger to the first and second electrode terminals.

[0039] In some embodiments, the medium channel is projected onto the same projection plane along the third direction, and the projection of the medium channel in the second direction is located within the projection range of the battery cell in the second direction.

[0040] In this way, the waste of heat or cold energy of the heat exchange medium in the medium flow channel can be minimized, and the heat exchange medium in the medium flow channel can be fully utilized to exchange heat with the battery cells.

[0041] In some embodiments, the dimensions of the housing along the first direction and the dimensions of the housing along the third direction are smaller than the dimensions of the battery cell along the second direction, and the dimensions of the housing along the second direction are in the range of 300 mm to 1200 mm.

[0042] It can balance the battery capacity and assembly efficiency.

[0043] In some embodiments, the heat exchanger includes a first heat exchange plate and a second heat exchange plate, a portion of the first heat exchange plate protrudes to form a protrusion, the first heat exchange plate and the second heat exchange plate are stacked, and the protrusion and the second heat exchange plate define the medium flow channel.

[0044] By protruding a portion of the first heat exchange plate to form a raised section, and creating a medium flow channel within the raised section, the raised section can be shaped to meet specific needs, thus enhancing the design flexibility of the medium flow channel. The size and path of the medium flow channel can be freely designed, making it suitable for complex scenarios with irregular heat source distribution or limited space, further improving heat exchange efficiency. Furthermore, by incorporating a raised section into at least one heat exchange plate to form a medium flow channel, design flexibility is further enhanced.

[0045] In some embodiments, the first heat exchange plate is welded to the second heat exchange plate.

[0046] This helps to improve the reliability of the connection structure between the first heat exchange plate and the second heat exchange plate.

[0047] In some embodiments, the battery cell assembly includes a first battery cell assembly and a second battery cell assembly, with the second battery cell assembly located above the first battery cell assembly.

[0048] At least one of the heat exchange components is disposed between the first battery cell assembly and the second battery cell assembly.

[0049] The second heat exchange plate has a first mating plane formed on the side opposite to the first heat exchange plate. The first mating plane faces the first battery cell assembly, and the protrusion faces the second battery cell assembly.

[0050] The heat exchange assembly further includes a heating element, which is disposed between the first mating plane and the first battery cell assembly.

[0051] In this embodiment, a heating element is provided between the first mating plane and the first battery cell assembly to simultaneously heat the first and second battery cell assemblies. This structure is simple, low-cost, and beneficial for improving heating efficiency. Furthermore, by forming the first mating plane on the side of the second heat exchange plate opposite to the first heat exchange plate, the placement of the heating element is facilitated, allowing for better contact between the heating element and the heat exchanger.

[0052] In some embodiments, the battery device further includes a spacer disposed in other areas of the first heat exchange plate except for the protrusion, the spacer abutting between the first heat exchange plate and the second battery cell assembly.

[0053] In this embodiment, by providing a spacer and abutting it between the first heat exchange plate and the second battery cell assembly, the spacer acts as a support, thereby improving the situation where the second battery cell assembly presses against the medium flow channel. This reduces the possibility of the second battery cell assembly crushing the medium flow channel, thus improving the reliability of the battery device. Furthermore, the spacer also acts as a barrier against adhesive overflow, preventing adhesive from spilling onto the outside of the battery cell assembly.

[0054] In some embodiments, thermally conductive adhesive is used to fill the space between the electrode terminals and the heat exchanger.

[0055] This helps to reduce the thermal resistance between the electrode terminals and the heat exchanger, improve the heat transfer efficiency between the electrode terminals and the heat exchanger, and thus improve the heat exchange efficiency of the electrode terminals.

[0056] In some embodiments, in the second direction, the minimum distance between the medium channel and the electrode terminal is in the range of 0 to 5 mm.

[0057] This can minimize the distance between the medium flow channel and the electrode terminals, thereby improving the heat exchange efficiency of the heat exchanger to the electrode terminals.

[0058] A second aspect of this application provides an electrical device, which includes the battery device described above.

[0059] Because it can improve the heat exchange efficiency of the heat exchange components while improving the temperature uniformity of the battery device, it is beneficial to improve the reliability of the electrical device.

[0060] A third aspect of this application provides an energy storage device, which includes the battery device described above.

[0061] Because it can improve the heat exchange efficiency of the heat exchange components while improving the temperature uniformity of the battery device, it is beneficial to improve the reliability of the energy storage device. Attached Figure Description

[0062] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0063] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0064] Figure 3 This is an exploded perspective view of the battery device provided in the first embodiment of this application;

[0065] Figure 4 This is an exploded perspective view of the battery device provided in the second embodiment of this application;

[0066] Figure 5 This is a schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;

[0067] Figure 6 This is a schematic diagram of the structure of a heat exchanger provided in some embodiments of this application;

[0068] Figure 7 This is a schematic diagram of the mating structure between the heat exchanger and the battery cell provided in the first embodiment of this application;

[0069] Figure 8 for Figure 7 Enlarged view of point A in the middle;

[0070] Figure 9 This is a schematic diagram of the cooperation structure between the heat exchanger and the battery cell provided in the second embodiment of this application.

[0071] Explanation of reference numerals in the attached figures

[0072] 10. Battery cell assembly; 11. Battery cell; 111. Electrode terminal; 1111. First electrode terminal; 1112. Second electrode terminal; 20. Battery housing; 21. First housing section; 22. Second housing section; 30. Heat exchange assembly; 31. Heat exchange component; 311. Medium flow channel; 3111. First medium flow channel; 3112. Second medium flow channel; 3113. Sub-flow channel; 312. First medium connection port; 313. Second medium connection port; 315. First region; 316. Second region; 317. Third region; 318. Connecting flow channel; 32. First heat exchange component; 33. Second heat exchange component; 34. Heating component; 40. Partition; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0073] 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.

[0074] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0075] In the description of the embodiments of this application, technical terms such as "first," "second," "third," and "fourth" 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.

[0076] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. Unless otherwise specified, all embodiments and optional embodiments of this application may be combined with each other to form new technical solutions. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of this application may be combined with each other to form new technical solutions.

[0077] 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 are in an "or" relationship.

[0078] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., 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 do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0079] 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0080] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0081] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "projection" refers to an orthographic projection in which parallel projection lines are perpendicular to the projection plane.

[0082] The following is a detailed description of this application.

[0083] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0084] The electrode terminals of individual battery cells generate significant heat during charging and discharging. Traditional bottom cooling methods are ineffective in reducing the terminal temperature, leading to excessive temperature differences within the battery cells and impacting the performance and reliability of the battery system. Research has shown that shortening the distance between the heat exchange medium channel and the electrode terminals, and directing the heat exchange medium to flow first through the channel closest to the electrode terminals, can improve both the heat exchange efficiency of the heat exchange components and the temperature uniformity of the battery system.

[0085] Based on this design concept, this application provides a battery device, which includes a battery housing, a heat exchange assembly, and at least one battery cell assembly. The battery cell assembly includes a plurality of battery cells arranged along a first direction. Each battery cell includes a housing and at least one electrode terminal, with the electrode terminal disposed at at least one end of the housing along a second direction. The heat exchange assembly includes at least one heat exchange element, which has a first medium connection port, a second medium connection port, and a medium flow path. The two ends of the medium flow path are respectively connected to the first and second medium connection ports. The heat exchange element is disposed on at least one side of the battery cell assembly along a third direction, and the first, second, and third directions intersect each other. The medium flow path includes a plurality of medium channels spaced apart along the second direction, each medium channel extending along the first direction and connected sequentially. Along the flow direction from the first to the second medium connection port, at least one medium channel closest to the electrode terminal in the second direction is located upstream of the other medium channels.

[0086] The battery device provided in this application embodiment has an electrode terminal disposed at at least one end of the housing along the second direction, and a heat exchanger disposed on at least one side of the battery cell assembly along the third direction. Therefore, the distance between the medium flow channel and the electrode terminal can be shortened to a certain extent, thereby improving the heat exchange efficiency of the heat exchanger to the electrode terminal. Since at least one medium flow channel closest to the electrode terminal in the second direction is located upstream of the other medium flow channels along the flow direction from the first medium connection port to the second medium connection port, during the flow of the heat exchange medium from the first medium connection port into the medium flow path and from the second medium connection port out of the medium flow path, the heat exchange medium will first flow through at least one medium flow channel closest to the electrode terminal in the second direction. Therefore, the heat exchange efficiency of the heat exchanger to the electrode terminal can be further improved, effectively reducing the electrode terminal temperature, reducing the risk of thermal runaway of the battery cell, shortening the temperature difference between battery cells, improving the temperature uniformity of the battery cell, and preventing overheating of the electrode terminal to a certain extent during the charging process of the battery cell, thereby improving the charging speed. Therefore, the battery device provided in this application embodiment can improve the temperature uniformity of the battery device while improving the heat exchange efficiency of the heat exchange assembly.

[0087] The battery device provided in this application embodiment can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0088] The battery device provided in this application embodiment can also be used in an energy storage device, which may include an energy storage container, an energy storage cabinet, etc.

[0089] This application also provides an electrical device including the above-described battery device. The electrical device can be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0090] In the following embodiments, for ease of explanation, an example of an electrical device according to an embodiment of this application is a vehicle.

[0091] Please refer to Figure 1The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0092] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0093] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 may include multiple battery cells 11, which are connected in series, parallel, or mixed connection via a busbar.

[0094] In some embodiments, the battery cell assembly 10 is typically formed by arranging multiple battery cells 11; as an example, the battery cell assembly 10 can be a battery module, which is formed by arranging and fixing multiple battery cells 11 into a single module. As an example, the battery module can be formed by binding multiple battery cells 11 together with cable ties.

[0095] In some embodiments, the battery device 100 may be a battery pack, which includes a battery housing 20 and one or more battery cell assemblies 10, the battery cell assemblies 10 being housed within the battery housing 20.

[0096] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be housed in the battery housing 20 by fixing the battery module in the battery housing 20.

[0097] As an example, the battery cell assembly 10 can also be housed in the housing by directly fixing multiple battery cells 11 to the battery housing 20.

[0098] In this embodiment of the application, the battery cell 11 can be a secondary battery, which refers to the battery cell 11 that can be used again after being discharged by recharging to activate the active material.

[0099] The battery cell 11 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0100] A battery cell 11 typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 11, 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.

[0101] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0102] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0103] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0104] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0105] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0106] In some embodiments, the battery cell 11 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application embodiment does not specifically limit the type of electrolyte and can select one according to requirements. The electrolyte can be liquid, gel, or solid.

[0107] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0108] In some embodiments, the electrode assembly has a stacked structure.

[0109] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0110] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0111] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0112] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0113] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0114] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0115] In some embodiments, the battery cell 11 may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0116] As an example, the battery cell 11 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells. Multi-prismatic battery cells are, for example, hexagonal prismatic battery cells. There are no particular limitations in the embodiments of this application.

[0117] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to release the internal pressure of the battery cell 11.

[0118] Below, refer to Figures 2 to 9 Some embodiments of this application will be described in detail.

[0119] In the description of the embodiments of this application, for ease of explanation, the direction of arrow X represents the "first direction", the direction of arrow Y represents the "second direction", and the direction of arrow Z represents the "third direction". The first direction X, the second direction Y, and the third direction Z intersect each other and are not coplanar. In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0120] Please see Figures 2 to 9This application provides a battery device 100, which includes a battery housing 20, a heat exchange assembly 30, and at least one battery cell assembly 10. The battery cell assembly 10 includes a plurality of battery cells 11 arranged along a first direction. Each battery cell 11 includes a housing and at least one electrode terminal 111, with the electrode terminal 111 disposed at at least one end of the housing along a second direction. The heat exchange assembly 30 includes at least one heat exchange element 31. The heat exchange element 31 is provided with a first medium communication port 312, a second medium communication port 313, and a medium flow path, with both ends of the medium flow path communicating with the first medium communication port 312 and the second medium communication port 313, respectively. The heat exchange element 31 is disposed on at least one side of the battery cell assembly 10 along a third direction, and the first, second, and third directions intersect each other. The medium flow path includes a plurality of medium channels 311 spaced apart along the second direction, each medium channel 311 extending along the first direction and connected sequentially. Along the flow direction from the first medium connection port 312 to the second medium connection port 313, at least one of the medium flow channels 311 that is closest to the electrode terminal 111 in the second direction is located upstream of the other medium flow channels 311.

[0121] For example, such as Figures 3 to 5 As shown, an electrode terminal 111 is provided on the housing. The electrode terminal 111 passes through the housing and is electrically connected to the electrode assembly through a tab.

[0122] For example, the electrode terminal 111 is made of a conductive metal, such as copper or aluminum.

[0123] The busbar can conduct the current from the battery cell 11 to other electrical components.

[0124] For example, the busbar can be made of pure aluminum or copper-aluminum composite material.

[0125] For example, the bus is welded to the electrode terminal 111.

[0126] For example, the battery cell 11 includes two electrode terminals 111 with opposite electrodes, each of which introduces or draws current through a different bus.

[0127] The number of battery cell modules 10 can be one or more.

[0128] The number of heat exchanger elements 31 can be one or more.

[0129] The housing may have an electrode terminal 111 at one end along the second direction, or it may have an electrode terminal 111 at both ends along the second direction.

[0130] The battery cell assembly 10 includes a plurality of battery cells 11 arranged along a first direction. At least one end of the housing along a second direction is provided with an electrode terminal 111. A heat exchanger 31 is provided on at least one side of the battery cell assembly 10 along a third direction. That is, the heat exchanger 31 is provided on the side of the electrode terminals 111 of all the battery cells 11 in the battery cell assembly 10, thereby shortening the distance between the heat exchanger 31 and the electrode terminals 111.

[0131] The heat exchanger 31 can be disposed on one side of the battery cell assembly 10 along a third direction, or it can be disposed on both sides of the battery cell assembly 10 along a third direction.

[0132] In an embodiment where electrode terminals 111 are provided at both ends of the housing along the second direction, that is, only one electrode terminal 111 is provided at each end of the housing along the second direction, and the electrode terminal 111 is located in the region of the housing near the heat exchanger 31 in the third direction (e.g., Figure 3 As shown in the figure, the distance between the medium flow channel 311 and the electrode terminal 111 can be shortened as much as possible, thereby improving the heat exchange efficiency of the heat exchanger 31 to the electrode terminal 111.

[0133] Specifically, the electrode terminal 111 is located in the area between the housing in the third direction and the heat exchanger 31.

[0134] like Figures 6 to 9 As shown, the two ends of the medium flow path are connected to the first medium connection port 312 and the second medium connection port 313 respectively. That is to say, the first medium connection port 312 and the second medium connection port 313 are used to introduce or export the heat exchange medium into or out of the medium flow path.

[0135] One of the first medium connection port 312 and the second medium connection port 313 is a medium inlet, and the other is a medium outlet. For example, the first medium connection port 312 can be the medium inlet and the second medium connection port 313 can be the medium outlet, or the first medium connection port 312 can be the medium outlet and the second medium connection port 313 can be the medium inlet. Alternatively, the direction of the heat exchange medium inlet or outlet can be changed according to the needs. That is, in the first state, the first medium connection port 312 is the medium inlet and the second medium connection port 313 is the medium outlet, and in the second state, the first medium connection port 312 is the medium outlet and the second medium connection port 313 is the medium inlet.

[0136] Each medium flow channel 311 extends along the first direction, that is, each medium flow channel 311 extends along the arrangement direction of each battery cell 11 in the battery cell assembly 10. Therefore, the medium flow channel 311 can simultaneously exchange heat with all the battery cells 11 in the battery cell assembly 10.

[0137] Each medium flow channel 311 is arranged at intervals along the second direction and connected in sequence. That is to say, each medium flow channel 311 is connected in series to realize the circulation of the heat exchange medium.

[0138] like Figure 3 As shown, in an embodiment where the housing is provided with an electrode terminal 111 at only one end along the second direction, only one of the multiple medium channels 311 is closest to the electrode terminal 111 in the second direction, that is, the outermost medium channel 311 on the side where the electrode terminal 111 is provided in the second direction.

[0139] like Figures 7 to 8 As shown, in an embodiment where the housing is provided with electrode terminals 111 at both ends along the second direction, two of the plurality of medium channels 311 are closest to the electrode terminals 111 in the second direction, namely the two outermost medium channels 311 in the second direction.

[0140] Since at least one of the media channels 311 closest to the electrode terminal 111 in the second direction is located upstream of the other media channels 311 along the flow direction from the first media connection port 312 to the second media connection port 313, the first media connection port 312 is connected to the media channel 311 closest to the electrode terminal 111 in the second direction. In other words, the heat exchange medium flows into the media channel 311 closest to the electrode terminal 111 first through the first media connection port 312.

[0141] Taking the use of heat exchange medium to cool battery cell 11 as an example, the heat exchange medium with a lower temperature flows into the medium flow path through the first medium connection port 312. During its flow in the medium flow path, it absorbs heat from the battery cell 11 to cool the battery cell 11. At the same time, the temperature of the heat exchange medium gradually increases, resulting in a gradual decrease in the heat exchange effect of the heat exchange medium. Therefore, the heat exchange medium first flows into the medium flow channel 311 closest to the electrode terminal 111 through the first medium connection port 312 to directly cool the electrode terminal 111. At this time, the temperature of the heat exchange medium is relatively low, which can improve the heat exchange efficiency of the heat exchange component 31 to the electrode terminal 111, effectively reduce the temperature of the electrode terminal 111, reduce the risk of thermal runaway of the battery cell 11, shorten the temperature difference of the battery cell 11, and improve the temperature uniformity of the battery cell 11.

[0142] Furthermore, under high-rate fast charging conditions, cooling at the electrode terminal 111 effectively prevents overheating, thereby increasing charging speed and reducing charging time. This solves the problem of excessive heat generation at the electrode terminal 111 during high-rate charging and discharging.

[0143] For example, the first medium connection port 312 and the second medium connection port 313 can be used to connect to the pipeline of the air conditioning system or liquid storage device such as water tank of a vehicle or electrical equipment.

[0144] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve the heat exchange effect on the battery cell 11. For example, it can be in a gaseous or liquid state. In this embodiment, a coolant is used as the heat exchange medium for description.

[0145] The principle of heat exchange component 30 for heat exchange of battery cell assembly 10 is as follows: the heat exchange medium output from the heat exchange medium source (not shown in the figure) enters the medium flow channel 311 through the inlet of heat exchange component 30. After the heat exchange medium exchanges heat with battery cell assembly 10, the heat exchange medium flows out through the outlet of heat exchange component 30, thus completing the heat exchange of battery cell assembly 10.

[0146] Here, the heat exchange component 30 can exchange heat with the battery cell assembly 10 by either dissipating heat from the battery cell assembly 10 or by heating the battery cell assembly 10.

[0147] The principle of heat exchange component 30 for heat dissipation of battery cell assembly 10 is as follows: the heat exchange medium output from the heat exchange medium source enters the medium flow channel 311 through the medium inlet of the heat exchange component 30. After the heat exchange medium absorbs the heat generated during the operation of battery cell assembly 10, the heat exchange medium flows out through the medium outlet of the heat exchange component 30, releasing the heat and completing the cooling and heat dissipation of battery cell assembly 10.

[0148] The principle of the heat exchange component 30 heating the battery cell assembly 10 is as follows: the heat exchange medium output from the heat exchange medium source enters the medium flow channel 311 through the medium inlet of the heat exchange component 30, and the heat exchange medium transfers heat to the battery cell assembly 10. After heating the battery cell assembly 10, the heat exchange medium flows out through the medium outlet of the heat exchange component 30, thus completing the heating of the battery cell assembly 10.

[0149] The battery device 100 provided in this application embodiment has an electrode terminal 111 provided at least at one end of the housing along the second direction, and the heat exchanger 31 is provided on at least one side of the battery cell assembly 10 along the third direction. Therefore, the distance between the medium flow channel 311 and the electrode terminal 111 can be shortened to a certain extent, thereby improving the heat exchange efficiency of the heat exchanger 31 to the electrode terminal 111. Because at least one medium flow channel 311 closest to the electrode terminal 111 in the second direction is located upstream of the other medium flow channels 311 along the flow direction from the first medium connection port 312 to the second medium connection port 313, during the flow of the heat exchange medium from the first medium connection port 312 into the medium flow path and from the second medium connection port 313 out of the medium flow path, the heat exchange medium will first flow through at least one medium flow channel 311 closest to the electrode terminal 111 in the second direction. Therefore, the heat exchange efficiency of the heat exchange component 31 to the electrode terminal 111 can be further improved, effectively reducing the temperature of the electrode terminal 111, reducing the risk of thermal runaway of the battery cell 11, shortening the temperature difference of the battery cell 11, improving the temperature uniformity of the battery cell 11, and preventing the electrode terminal 111 from overheating to a certain extent during the charging process of the battery cell 11, thereby improving the charging speed. Therefore, the battery device 100 provided in this application embodiment can improve the heat exchange efficiency of the heat exchange component 30 while improving the temperature uniformity of the battery device 100.

[0150] In some embodiments, please refer to Figures 6 to 8 At least a portion of the medium flow channel 311 includes a plurality of parallel sub-flow channels 3113, the plurality of sub-flow channels 3113 being spaced apart along a second direction, and each sub-flow channel 3113 extending along a first direction.

[0151] It can be that part of the medium flow channel 311 includes multiple sub-flow channels 3113 connected in parallel, or all of the medium flow channels 311 include multiple sub-flow channels 3113 connected in parallel.

[0152] For example, each sub-channel 3113 of the same medium flow channel 311 is uniformly distributed along the second direction, which facilitates the uniform flow of the heat exchange medium in the medium flow channel 311.

[0153] Since the medium flow channel 311 includes multiple sub-flow channels 3113 connected in parallel, the flow rate of the heat exchange medium can be increased. Moreover, compared with the case where all sub-flow channels 3113 are connected in series, the flow path of the heat exchange medium can be shortened, thereby further improving the heat exchange efficiency.

[0154] In some embodiments, please refer to Figures 5 to 9The electrode terminal 111 includes a first electrode terminal 1111 and a second electrode terminal 1112. The first electrode terminal 1111 is disposed at a first end of the housing along a second direction, and the second electrode terminal 1112 is disposed at a second end of the housing along the second direction. Along the flow direction from the first medium connection port 312 to the second medium connection port 313, the medium flow channel 311 closest to the first electrode terminal 1111 in the second direction is located upstream of the other medium flow channels 311. Along the flow direction from the second medium connection port 313 to the first medium connection port 312, the medium flow channel 311 closest to the second electrode terminal 1112 in the second direction is located upstream of the other medium flow channels 311.

[0155] For example, the first electrode terminal 1111 and the second electrode terminal 1112 have opposite polarities, and the first electrode terminal 1111 and the second electrode terminal 1112 each introduce or draw current through different busbars.

[0156] For example, an insulating sheet is provided between the heat exchanger 31 and the busbar to prevent short circuits, and thermally conductive structural adhesive is filled between the heat exchanger 31 and the insulating sheet to ensure heat conduction while meeting insulation requirements.

[0157] Since the medium flow channel 311 closest to the first electrode terminal 1111 in the second direction is located upstream of the other medium flow channels 311 along the flow direction from the first medium connection port 312 to the second medium connection port 313, the first medium connection port 312 is connected to the medium flow channel 311 closest to the first electrode terminal 1111 in the second direction. In other words, the heat exchange medium flows into the medium flow channel 311 closest to the first electrode terminal 1111 first through the first medium connection port 312, which is beneficial to improving the heat exchange efficiency of the first electrode terminal 1111. Because, along the flow direction from the second medium connection port 313 to the first medium connection port 312, the medium flow channel 311 closest to the second electrode terminal 1112 in the second direction is located upstream of the other medium flow channels 311, meaning that the second medium connection port 313 is connected to the medium flow channel 311 closest to the second electrode terminal 1112 in the second direction. In other words, the heat exchange medium can flow into the medium flow channel 311 closest to the second electrode terminal 1112 first through the second medium connection port 313, which is beneficial to improving the heat exchange efficiency to the second electrode terminal 1112. Thus, to a certain extent, the distance between the medium flow channel 311 and the first electrode terminal 1111 and the second electrode terminal 1112 can be shortened, thereby improving the heat exchange efficiency of the heat exchanger 31 for the first electrode terminal 1111 and the second electrode terminal 1112. Furthermore, by changing the flow direction of the heat exchange medium in the medium flow path, the heat exchange medium can flow into the medium flow channel 311 closest to the first electrode terminal 1111 first through the first medium connection port 312, or flow into the medium flow channel 311 closest to the second electrode terminal 1112 first through the second medium connection port 313. Therefore, the heat exchange efficiency of the heat exchanger 31 for the first electrode terminal 1111 and the second electrode terminal 1112 can be further improved. While effectively reducing the temperature of the first electrode terminal 1111 and the second electrode terminal 1112, the temperature difference between the first electrode terminal 1111 and the second electrode terminal 1112 is shortened, thereby further improving the temperature uniformity performance of the battery cell 11.

[0158] In some embodiments, please refer to Figures 6 to 8 The medium flow path 311 includes a first medium flow path 3111 and a second medium flow path 3112. In the second direction, the first medium flow path 3111 is closest to the first electrode terminal 1111 compared to the other medium flow paths 311, and the second medium flow path 3112 is closest to the second electrode terminal 1112 compared to the other medium flow paths 311. The medium flow path also includes a connecting flow path 318, which extends along the second direction, and the end of the first medium flow path 3111 opposite to the first medium connection port 312 is directly connected to the end of the second medium flow path 3112 opposite to the second medium connection port 313 through the connecting flow path 318.

[0159] The direct connection mentioned here means that the end of the first medium flow channel 3111 away from the first medium connection port 312 and the end of the second medium flow channel 3112 away from the second medium connection port 313 are directly connected only through the connecting flow channel 318. That is, there are no other medium flow channels 311 between the first medium flow channel 3111 and the second medium flow channel 3112. In other words, the medium flow channel 311 only includes the first medium flow channel 3111 and the second medium flow channel 3112.

[0160] In other words, in the second direction, the first medium flow channel 3111 is disposed at the first end of the heat exchanger 31 and is mainly used for heat exchange of the first electrode terminal 1111, and the second medium flow channel 3112 is disposed at the second end of the heat exchanger 31 and is mainly used for heat exchange of the second electrode terminal 1112.

[0161] Since the end of the first medium flow channel 3111 away from the first medium connection port 312 is directly connected to the end of the second medium flow channel 3112 away from the second medium connection port 313 through the connecting flow channel 318, that is, the first medium flow channel 3111 and the second medium flow channel 3112 are connected in series through the connecting flow channel 318, and the heat exchange medium is circulated between the first medium flow channel 3111 and the second medium flow channel 3112.

[0162] In the second direction, since the first medium flow channel 3111 is located at the first end of the heat exchanger 31 and is mainly used for heat exchange of the first electrode terminal 1111, and the second medium flow channel 3112 is located at the second end of the heat exchanger 31 and is mainly used for heat exchange of the second electrode terminal 1112, and there are no other medium flow channels 311 between the first medium flow channel 3111 and the second medium flow channel 3112, this helps to reduce the heat exchange medium in other medium flow channels besides the first medium flow channel 3111 and the second medium flow channel 3112. The heat or cold energy loss in 311 can further improve the heat exchange efficiency of the heat exchanger 31 to the first electrode terminal 1111 and the second electrode terminal 1112. While effectively reducing the temperature of the first electrode terminal 1111 and the second electrode terminal 1112, the temperature difference between the first electrode terminal 1111 and the second electrode terminal 1112 is shortened, thereby further improving the temperature uniformity of the battery cell 11. In addition, the flow path of the heat exchange medium can be further shortened, thereby further improving the heat exchange efficiency of the heat exchanger 31.

[0163] In some embodiments, please refer to Figures 6 to 8 The first medium connection port 312 and the second medium connection port 313 are located on the same side of the heat exchanger 31 along the first direction. The first medium connection port 312 and the connecting flow channel 318 are located on different sides of the heat exchanger 31 along the first direction.

[0164] Since the first medium connection port 312 and the second medium connection port 313 are located on the same side of the heat exchanger 31 along the first direction, it is convenient for the heat exchanger 31 to communicate with the outside through the first medium connection port 312 and the second medium connection port 313, which helps to simplify the flow path of the heat exchange system and improve the structural compactness of the battery device 100.

[0165] The first medium connection port 312 and the connecting flow channel 318 are located on different sides of the heat exchanger 31 along the first direction, that is, the first medium connection port 312 and the connecting flow channel 318 are located on opposite sides of the heat exchanger 31 along the first direction, and the second medium connection port 313 and the connecting flow channel 318 are also located on opposite sides of the heat exchanger 31 along the first direction.

[0166] Since the first medium connection port 312 and the connecting flow channel 318 are located on different sides of the heat exchanger 31 along the first direction, the heat exchange range of the heat exchanger 31 can be increased, while the flow path of the heat exchange system can be further simplified, and the structural compactness of the battery device 100 can be improved.

[0167] In some embodiments, please refer to Figure 6 The heat exchanger 31 includes a first region 315, a second region 316, and a third region 317 arranged sequentially along a second direction. A first medium flow channel 3111 is disposed in the first region 315, a second medium flow channel 3112 is disposed in the third region 317, and no medium flow channel 311 is disposed in the second region 316. The dimension of the second region 316 in the first direction is greater than or equal to the dimension of the first region 315 in the first direction, and is greater than or equal to the dimension of the third region 317 in the first direction.

[0168] In other words, the second region 316 between the first region 315 and the third region 317 does not have a medium flow channel 311, but the medium flow channel 311 is concentrated in the first region 315 and the third region 317.

[0169] For example, the first region 315 is disposed on the side of the heat exchanger 31 near the first electrode terminal 1111, the third region 317 is disposed on the side of the heat exchanger 31 near the second electrode terminal 1112, and the second region 316 is disposed between the first region 315 and the third region 317.

[0170] It should be noted that the size of the first region 315 in the first direction and the size of the third region 317 in the first direction are not limited here. The size of the first region 315 in the first direction can be equal to, smaller than, or larger than the size of the third region 317 in the first direction.

[0171] Since the size of the second region 316 in the first direction is greater than or equal to the size of the first region 315 in the first direction, and greater than or equal to the size of the third region 317 in the first direction, it is advantageous to further concentrate the medium flow channel 311 in a smaller area, thereby further reducing the heat or cold loss of the heat exchange medium, and thus concentrating the heat exchange on the first electrode terminal 1111 and the second electrode terminal 1112.

[0172] Since the second region 316 does not have a medium flow channel 311, but the medium flow channels 311 are concentrated in the first region 315 and the third region 317, it is beneficial to reduce the heat or cold loss of the heat exchange medium in the other medium flow channels 311 besides the first medium flow channel 3111 and the second medium flow channel 3112, thereby further improving the heat exchange efficiency of the heat exchanger 31 to the first electrode terminal 1111 and the second electrode terminal 1112.

[0173] In some embodiments, please refer to Figure 6 The ratio of the dimension of the second region 316 in the second direction to the dimension of the heat exchanger 31 in the second direction is in the range of 0.3 to 0.8.

[0174] The ratio of the dimension of the second region 316 in the second direction to the dimension of the heat exchanger 31 in the second direction can be any one of 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8 or any value between the two.

[0175] Since the ratio of the size of the second region 316 in the second direction to the size of the heat exchanger 31 in the second direction is in the range of 0.3 to 0.8, the medium flow channel 311 can be concentrated in the first region 315 and the third region 317 as much as possible, while the first region 315 and the third region 317 can also have a certain size for setting the medium flow channel 311, so as to improve the heat exchange efficiency of the heat exchanger 31 for the first electrode terminal 1111 and the second electrode terminal 1112.

[0176] In some embodiments, please refer to Figure 6 The ratio of the dimension of the first region 315 in the second direction to the dimension of the heat exchanger 31 in the second direction is in the range of 0.1 to 0.6.

[0177] In some embodiments, please refer to Figure 6 The ratio of the dimension of the third region 317 in the second direction to the dimension of the heat exchanger 31 in the second direction is in the range of 0.1 to 0.6.

[0178] In some embodiments, please refer to Figure 9The electrode terminal 111 includes a first electrode terminal 1111 and a second electrode terminal 1112. The first electrode terminal 1111 is disposed at a first end of the housing along the second direction, and the second electrode terminal 1112 is disposed at a second end of the housing along the second direction. The heat exchanger 31 includes a first heat exchanger 32 and a second heat exchanger 33. The first heat exchanger 32 and the second heat exchanger 33 are spaced apart along the second direction and are disposed on the same side of the battery cell assembly 10 along the third direction. In the second direction, the first heat exchanger 32 is closest to the first electrode terminal 1111 compared to the other heat exchangers 31, and the second heat exchanger 33 is closest to the second electrode terminal 1112 compared to the other heat exchangers 31.

[0179] For example, the first heat exchanger 32 and the second heat exchanger 33 can be connected by a connecting pipe.

[0180] For example, the first heat exchanger 32 and the second heat exchanger 33 may not be connected to each other, but may be directly connected to the pipeline of the air conditioning system or liquid storage device such as water tank of the vehicle or electrical equipment.

[0181] In the second direction, since the first heat exchanger 32 is closest to the first electrode terminal 1111 compared to the other heat exchangers 31, and the second heat exchanger 33 is closest to the second electrode terminal 1112 compared to the other heat exchangers 31, heat exchange can be performed on the first electrode terminal 1111 and the second electrode terminal 1112 by the first heat exchanger 32 and the second heat exchanger 33 respectively, thereby further improving the heat exchange efficiency of the heat exchanger 31 on the first electrode terminal 1111 and the second electrode terminal 1112.

[0182] In some embodiments, please refer to Figure 9 Along the flow direction from the first medium connection port 312 to the second medium connection port 313 of the first heat exchanger 32, the medium flow channel 311 closest to the first electrode terminal 1111 in the second direction among the plurality of medium flow channels 311 of the first heat exchanger 32 is located upstream of the other medium flow channels 311 of the first heat exchanger 32. Along the flow direction from the first medium connection port 312 to the second medium connection port 313 of the second heat exchanger 33, the medium flow channel 311 closest to the second electrode terminal 1112 in the second direction among the plurality of medium flow channels 311 of the second heat exchanger 33 is located upstream of the other medium flow channels 311 of the second heat exchanger 33.

[0183] Since the medium flow channel 311 of the first heat exchanger 32 is closest to the first electrode terminal 1111 in the second direction along the flow direction from the first medium connection port 312 to the second medium connection port 313 of the first heat exchanger 32, the medium flow channel 311 of the first heat exchanger 32 is located upstream of the other medium flow channels 311 of the first heat exchanger 32. That is to say, the first medium connection port 312 of the first heat exchanger 32 is connected to the medium flow channel 311 of the first heat exchanger 32 that is closest to the first electrode terminal 1111 in the second direction. In other words, the heat exchange medium flows into the medium flow channel 311 of the first heat exchanger 32 that is closest to the first electrode terminal 1111 first through the first medium connection port 312, which is beneficial to improving the heat exchange efficiency of the first heat exchanger 32 to the first electrode terminal 1111. Since the medium flow channel 311 of the second heat exchanger 33 is closest to the second electrode terminal 1112 in the second direction along the flow direction from the first medium connection port 312 to the second medium connection port 313 of the second heat exchanger 33, the medium flow channel 311 of the second heat exchanger 33 is located upstream of the other medium flow channels 311 of the second heat exchanger 33. That is to say, the first medium connection port 312 of the second heat exchanger 33 is connected to the medium flow channel 311 of the second heat exchanger 33 that is closest to the second electrode terminal 1112 in the second direction. In other words, the heat exchange medium can flow into the medium flow channel 311 of the second heat exchanger 33 that is closest to the second electrode terminal 1112 first through the first medium connection port 312 of the second heat exchanger 33, which is beneficial to improving the heat exchange efficiency of the second heat exchanger 33 to the second electrode terminal 1112. In this way, the distance between the medium flow channel 311 and the first electrode terminal 1111 and the second electrode terminal 1112 can be shortened to a certain extent, thereby improving the heat exchange efficiency of the heat exchanger 31 to the first electrode terminal 1111 and the second electrode terminal 1112.

[0184] In some embodiments, please refer to Figures 6 to 9 The medium flow channel 311 is projected onto the same projection plane along a third direction, and the projection of the medium flow channel 311 in the second direction is located within the projection range of the battery cell 11 in the second direction.

[0185] In other words, the area of ​​the heat exchanger 31 in which the medium flow channel 311 is formed has a dimension in the second direction that is less than or equal to the dimension of the battery cell 11 in the second direction.

[0186] In other words, in the second direction, the medium flow channel 311 is located between the first electrode terminal 1111 and the second electrode terminal 1112.

[0187] In this way, the waste of heat or cold energy of the heat exchange medium in the medium flow channel 311 can be minimized, and the heat exchange medium in the medium flow channel 311 can be fully utilized to exchange heat with the battery cell 11.

[0188] In some embodiments, please refer to Figure 5 The dimensions h1 of the housing along the first direction and h3 of the housing along the third direction are smaller than the dimension h2 of the battery cell 11 along the second direction. The dimension h2 of the housing along the second direction is in the range of 300mm to 1200mm.

[0189] The dimensions of the housing along the second direction can be any one of 300mm, 350mm, 400mm, 450mm, 500mm, 560mm, 600mm, 660mm, 700mm, 750mm, 800mm, 820mm, 860mm, 900mm, 950mm, 1000mm, 1060mm, 1100mm, 1150mm, or 1200mm, or a value between any two of them.

[0190] Here, h1, h2, and h3 can be measured at room temperature using measuring tools such as vernier calipers before the battery device 100 is used.

[0191] It should be noted that h1, h2 and h3 do not include the dimensions of electrode terminals 111 and / or pressure relief structures, that is, h1, h2 and h3 can be obtained by measuring the dimensions of the casing of the battery cell 11.

[0192] In this embodiment, by setting the size of the housing along the second direction to be in the range of 300mm to 1200mm, the battery capacity and assembly efficiency of the battery device 100 can be balanced.

[0193] For example, the battery cell 11 in this embodiment may be a blade battery, which is both long and thin.

[0194] The dimensions of the housing along a third direction can be greater than the dimensions of the housing along the first direction, or the dimensions of the housing along a third direction can be less than the dimensions of the housing along the first direction, or the dimensions of the housing along a third direction can be equal to the dimensions of the housing along the first direction.

[0195] It is understandable that, while facilitating the stacking of battery cells 11 along the first direction, it also facilitates the stacking of battery cells 11 along a third direction. In other words, the number of battery cells 11 can be increased in both the first and third directions to improve the capacity of the battery device 100.

[0196] In some embodiments, the heat exchanger 31 includes a first heat exchange plate and a second heat exchange plate. A portion of the first heat exchange plate protrudes to form a protrusion. The first heat exchange plate and the second heat exchange plate are stacked together, and a medium flow channel 311 is defined between the protrusion and the second heat exchange plate.

[0197] By protruding a portion of the first heat exchange plate to form a raised section, and forming a medium flow channel 311 within the raised section, the raised section can be shaped as needed, thus improving the design flexibility of the medium flow channel 311. The size and path of the medium flow channel 311 can be freely designed, making it suitable for complex scenarios with irregular heat source distribution or limited space, and further improving heat exchange efficiency. Furthermore, by providing a raised section on at least one heat exchange plate to form a medium flow channel 311 within the raised section, design flexibility is further enhanced.

[0198] Since only a portion of the first heat exchange plate needs to be protruded to form a raised part, the second heat exchange plate does not need to form a raised part. This reduces the number of steps required to form a raised part on the second heat exchange plate and also reduces the difficulty of positioning the first and second heat exchange plates, which helps to improve production efficiency.

[0199] For example, the medium flow channel 311 includes a bend.

[0200] Here, the size and path of the medium flow channel 311 can be freely designed according to the heat distribution or spatial distribution of the battery cell 11. For example, by setting the medium flow channel 311 to include a bend, it is beneficial to improve heat exchange efficiency and ease of assembly.

[0201] For example, the first heat exchange plate may be formed with protrusions by stamping.

[0202] The specific materials of the first and second heat exchange plates are not limited here.

[0203] In some embodiments, the first heat exchange plate and the second heat exchange plate are made of metal plates. For example, the materials of the first heat exchange plate and the second heat exchange plate may be aluminum alloy, steel, etc.

[0204] The first heat exchange plate and the second heat exchange plate can be made of the same material or different materials.

[0205] In this embodiment, by setting the first heat exchange plate and the second heat exchange plate as metal plates, the metal plates have both good structural strength and good thermal conductivity. In other words, while ensuring that the first heat exchange plate and the second heat exchange plate have a certain heat exchange efficiency, the first heat exchange plate and the second heat exchange plate can also have a certain structural strength.

[0206] For example, the first heat exchange plate and the second heat exchange plate are welded together. That is, the first heat exchange plate and the second heat exchange plate are welded together to form the heat exchange component 31, which helps to improve the reliability of the connection structure between the first heat exchange plate and the second heat exchange plate.

[0207] For example, the heat exchange plates are connected by brazing.

[0208] Brazing combines dissimilar metals (such as aluminum-based composites) through a hot-rolling composite process, giving the material high mechanical strength, corrosion resistance, and fatigue resistance, making it suitable for heavy-duty and harsh environments. Furthermore, brazed joints offer good airtightness and liquid tightness, supporting the joining of various metals and alloys. Additionally, the size and path of the medium flow channel 311 can be freely designed, making it suitable for complex scenarios with irregular heat source distribution or limited space.

[0209] In some embodiments, please refer to Figures 3 to 4 The battery cell assembly 10 includes a first battery cell assembly and a second battery cell assembly, with the second battery cell assembly located above the first battery cell assembly. At least one heat exchanger 31 is disposed between the first battery cell assembly and the second battery cell assembly. A first mating plane is formed on the side of the second heat exchange plate opposite to the first heat exchange plate, the first mating plane facing the first battery cell assembly, and the protrusion facing the second battery cell assembly. The heat exchange assembly 30 also includes a heating element 34, which is disposed between the first mating plane and the first battery cell assembly.

[0210] In addition to the first battery cell assembly and the second battery cell assembly, the battery cell assembly 10 may also include other battery cell assemblies 10, such as a third battery cell assembly 10. The third battery cell assembly 10 may be located below the first battery cell assembly or above the second battery cell assembly.

[0211] A heat exchanger 31 is provided between the first battery cell assembly and the second battery cell assembly.

[0212] Here, the first heat exchange plate and the second heat exchange plate are stacked, with the first heat exchange plate located above the second heat exchange plate. The second heat exchange plate has a first mating plane on the side facing away from the first heat exchange plate. That is, the first mating plane is used to mate with the first battery cell assembly, and the protrusion is provided on the side of the heat exchange component 31 facing the second battery cell assembly.

[0213] In this embodiment, a first mating plane is formed on the side of the second heat exchange plate away from the first heat exchange plate. The first mating plane is used to mate with the first battery cell assembly, so that the heat exchange component 31 can better mate with the first battery cell assembly.

[0214] In cold environments, the temperature of the battery device 100 may be low, which may also affect the performance of the battery device 100. In related technologies, a heating device is set up to heat the heat exchange medium, thereby heating the battery cell 11. However, this method has the problems of complex structure and high cost.

[0215] For example, the heating element 34 may be a heating film, and further, the heating element 34 may be an electric heating film.

[0216] For example, the heating element 34 has a heating resistor inside, which generates heat when energized to heat the battery cell assembly 10.

[0217] When the battery cell assembly 10 needs to be heated, part of the heat generated by the heating element 34 can be directly transferred to the first battery cell assembly, and the other part can be transferred to the second battery cell assembly through the heat exchange element 31. The material of the heat exchange element 31 itself can effectively transfer the heat generated by the heating element 34 to the second battery cell assembly. In this way, the heating element 34 can simultaneously heat two adjacent battery cell assemblies 10 (such as the first battery cell assembly and the second battery cell assembly), thereby improving the heating efficiency.

[0218] When the battery cell assembly 10 needs to be cooled, the cold energy generated by the heat exchanger 31 can be transferred to the first battery cell assembly through the heating element 34 (at this time the heating element 34 does not generate heat) to achieve heat dissipation of the first battery cell assembly.

[0219] A heating element 34 is provided between the first mating plane and the first battery cell assembly. In other words, the heating element 34 is provided between the first mating plane and the first battery cell assembly. The first mating plane contacts the first battery cell assembly through the heating element 34.

[0220] For example, the heating element 34 can be first attached to the surface of the heat exchanger 31, that is, attached to the first mating plane, and then the heat exchanger 31 and the heating element 34 can be mated with the first battery cell assembly, for example, by applying adhesive. Of course, it is also possible to first attach the heating element 34 to the first battery cell assembly, and then apply adhesive to fix the heat exchanger 31, the heating element 34 and the first battery cell assembly.

[0221] In this embodiment, a heating element 34 is provided between the first mating plane and the first battery cell assembly to simultaneously heat the first and second battery cell assemblies. This structure is simple, low-cost, and beneficial for improving heating efficiency. Furthermore, by forming the first mating plane on the side of the second heat exchange plate opposite to the first heat exchange plate, the placement of the heating element 34 is facilitated, allowing the heating element 34 to better fit with the heat exchanger 31.

[0222] In some embodiments, please refer to Figures 3 to 4 The battery device 100 also includes a partition 40, which is disposed in the area of ​​the first heat exchange plate other than the protrusion, and the partition 40 abuts between the first heat exchange plate and the second battery cell assembly.

[0223] For example, the partition 40 abuts between the first heat exchange plate of the heat exchanger 31 and the second battery cell assembly.

[0224] For example, the first heat exchange plate and the second battery cell assembly can be bonded together by applying adhesive. The partition 40 can act as a barrier to prevent the adhesive from overflowing.

[0225] The partition 40 abuts between the first heat exchange plate and the second battery cell assembly. In other words, the second battery cell assembly is pressed against the partition 40, rather than against the heat exchanger 31. The partition 40 can play a supporting role, thus preventing the second battery cell assembly from crushing the medium flow channel 311 (protrusion) to a certain extent.

[0226] For example, the partition 40 may be higher than the protrusion, and a medium flow channel 311 is formed in the protrusion so that the upper battery cell assembly 10 presses on the partition 40 instead of the protrusion.

[0227] In this embodiment, by providing a spacer 40 and abutting it between the first heat exchange plate and the second battery cell assembly, the spacer 40 can provide support, thereby improving the situation where the second battery cell assembly presses against the medium flow channel 311. This reduces the possibility of the second battery cell assembly crushing the medium flow channel 311, thus improving the reliability of the battery device 100. Furthermore, the spacer 40 can also act as a barrier against adhesive overflow, thereby reducing the possibility of adhesive overflowing to the outside of the battery cell assembly 10.

[0228] The partition 40 may be provided on one side of the protrusion along the second direction, or the partition 40 may be provided on both sides of the protrusion along the second direction.

[0229] Of course, the partition 40 can also be located in the middle of the protrusion, for example, the partition 40 can be located in the gap between adjacent medium flow channels 311.

[0230] For example, the partition 40 extends along a first direction.

[0231] In this embodiment, a baffle 40 is provided on at least one side of the protrusion along the second direction, which helps to block the adhesive and further improve the situation of adhesive overflow.

[0232] In some embodiments, thermally conductive adhesive is used to fill the space between the electrode terminal 111 and the heat exchanger 31.

[0233] For example, the thermal resistance of thermally conductive adhesive is less than that of air.

[0234] Since thermally conductive adhesive is filled between the electrode terminal 111 and the heat exchanger 31, heat can be conducted between the electrode terminal 111 and the heat exchanger 31 through the thermally conductive adhesive.

[0235] This helps to reduce the thermal resistance between the electrode terminal 111 and the heat exchanger 31, improve the heat conduction efficiency between the electrode terminal 111 and the heat exchanger 31, and thus improve the heat exchange efficiency of the electrode terminal 111.

[0236] In some embodiments, please refer to Figure 7 In the second direction, the minimum distance h4 between the medium flow channel 311 and the electrode terminal 111 is in the range of 0 to 5 mm.

[0237] The minimum distance between the medium flow channel 311 and the electrode terminal 111 can be any one of 0, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.6 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, or any value between two of them.

[0238] Here, h4 can be measured at room temperature using measuring tools such as vernier calipers before the battery device 100 is used.

[0239] In the second direction, since the minimum distance h4 between the medium flow channel 311 and the electrode terminal 111 is set to be in the range of 0 to 5 mm, the distance between the medium flow channel 311 and the electrode terminal 111 can be shortened as much as possible, thereby improving the heat exchange efficiency of the heat exchanger 31 to the electrode terminal 111.

[0240] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of this application.

Claims

1. A battery device, characterized by, The battery device comprises: a battery box; at least one battery cell assembly, which comprises a plurality of battery cells arranged along a first direction, the battery cell comprising a shell and at least one electrode terminal, the shell being provided with the electrode terminal at at least one end along a second direction; a heat exchange assembly, which comprises at least one heat exchange piece provided with a first medium communication port, a second medium communication port and a medium flow path, the two ends of the medium flow path being in communication with the first medium communication port and the second medium communication port respectively, the heat exchange piece being arranged at at least one side of the battery cell assembly along a third direction, the first direction, the second direction and the third direction intersecting with each other; wherein the medium flow path comprises a plurality of medium flow channels arranged at intervals along the second direction, each of the medium flow channels extending along the first direction and being in communication with each other in sequence; the electrode terminal comprises a first electrode terminal and a second electrode terminal, the shell being provided with the first electrode terminal at a first end along the second direction, and the shell being provided with the second electrode terminal at a second end along the second direction; the medium flow channel comprises a first medium flow channel and a second medium flow channel, in the second direction, the first medium flow channel being closest to the first electrode terminal compared with other medium flow channels, and the second medium flow channel being closest to the second electrode terminal compared with other medium flow channels, the medium flow path further comprising a connecting flow channel, the connecting flow channel extending along the second direction, and one end of the first medium flow channel away from the first medium communication port being in direct communication with one end of the second medium flow channel away from the second medium communication port through the connecting flow channel; in the flow direction from the first medium communication port to the second medium communication port, the first medium flow channel is upstream of other medium flow channels, and in the flow direction from the second medium communication port to the first medium communication port, the second medium flow channel is upstream of other medium flow channels; in the second direction, the minimum distance between the first medium flow channel and the first electrode terminal is in the range of 0-5 mm, and the minimum distance between the second medium flow channel and the second electrode terminal is in the range of 0-5 mm, the heat exchange piece comprises a first region, a second region and a third region arranged in sequence along the second direction, the first medium flow channel is arranged in the first region, the second medium flow channel is arranged in the third region, and the second region is not provided with a medium flow channel, the size of the second region in the first direction is greater than or equal to the size of the first region in the first direction, and greater than or equal to the size of the third region in the first direction, the medium flow channel comprises a plurality of sub-flow channels connected in parallel, the plurality of sub-flow channels being arranged at intervals along the second direction, each of the sub-flow channels extending along the first direction, and each of the sub-flow channels of the same medium flow channel being uniformly distributed along the second direction.

2. The battery device according to claim 1, wherein the first medium communication port and the second medium communication port are located on the same side of the heat exchange piece along the first direction, The first medium communication port and the connection flow passage are located on different sides of the heat exchange member in the first direction.

3. The battery device according to claim 1, wherein A ratio of a dimension of the second region in the second direction to a dimension of the heat exchange member in the second direction is in a range of 0.3 to 0.

8.

4. The battery device according to claim 1, wherein The electrode terminal includes a first electrode terminal and a second electrode terminal, The first electrode terminal is provided at a first end of the case in the second direction, and the second electrode terminal is provided at a second end of the case in the second direction, The heat exchange member includes a first heat exchange member and a second heat exchange member, the first heat exchange member and the second heat exchange member are spaced apart in the second direction, and are provided on the same side of the battery cell assembly in the third direction, In the second direction, the first heat exchange member is closest to the first electrode terminal among the heat exchange members, and the second heat exchange member is closest to the second electrode terminal among the heat exchange members.

5. The battery device according to claim 4, wherein In a flow direction from the first medium communication port to the second medium communication port of the first heat exchange member, the medium flow passage closest to the first electrode terminal among the medium flow passages of the first heat exchange member in the second direction is upstream of the other medium flow passages of the first heat exchange member, In a flow direction from the first medium communication port to the second medium communication port of the second heat exchange member, the medium flow passage closest to the second electrode terminal among the medium flow passages of the second heat exchange member in the second direction is upstream of the other medium flow passages of the second heat exchange member.

6. The battery device according to any one of claims 1 to 5, wherein In a projection onto the same projection plane in the third direction, a projection of the medium flow passage in the second direction is within a projection range of the battery cell in the second direction.

7. The battery device according to any one of claims 1 to 5, wherein A dimension of the case in the first direction and a dimension of the case in the third direction are smaller than a dimension of the battery cell in the second direction, The dimension of the case in the second direction is in a range of 300 mm to 1200 mm.

8. The battery device according to any one of claims 1 to 5, wherein The heat exchange member includes a first heat exchange plate and a second heat exchange plate, a part of the first heat exchange plate protrudes to form a protruding portion, the first heat exchange plate and the second heat exchange plate are stacked, and the medium flow passage is defined between the protruding portion and the second heat exchange plate.

9. The battery device of claim 8, wherein, The first heat exchange plate and the second heat exchange plate are connected by welding.

10. The battery device according to claim 8, wherein The battery cell assembly includes a first battery cell assembly and a second battery cell assembly, the second battery cell assembly is located above the first battery cell assembly, At least one of the heat exchange members is arranged between the first battery cell assembly and the second battery cell assembly, The first matching plane is arranged on the side of the second heat exchange plate away from the first heat exchange plate, and the protruding portion is arranged on the side of the second heat exchange plate facing the second battery cell assembly. The heat exchange assembly further comprises a heating member arranged between the first matching plane and the first battery cell assembly.

11. The battery device according to claim 10, wherein The battery device further comprises a barrier member arranged on the first heat exchange plate except the protruding portion, and the barrier member is arranged between the first heat exchange plate and the second battery cell assembly.

12. The battery device according to any one of claims 1 to 5, wherein The electrode terminal and the heat exchange member are filled with a heat-conducting adhesive.

13. An electrical device, characterized by The power-using device comprises the battery device according to any one of claims 1 to 12.

14. An energy storage device, characterized by The energy storage device comprises the battery device according to any one of claims 1 to 12.

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