Battery device, power utilization device and energy storage device

Abstract

The embodiment of the invention provides a battery device, a power utilization device and an energy storage device. The battery device comprises a battery box body, a heat exchange assembly and a battery monomer assembly, the battery cell assembly includes a plurality of battery cells arranged in a first direction. The battery monomer comprises a shell and an electrode terminal, and at least one end of the shell along the second direction is provided with the electrode terminal. The heat exchange assembly comprises a heat exchange piece, the heat exchange piece is 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 communicate with the first medium communication port and the second medium communication port correspondingly. The heat exchange piece is arranged on at least one side of the battery monomer assembly along the third direction. The medium flow path comprises a plurality of medium flow channels arranged at intervals in the second direction, and the medium flow channels extend in the first direction and communicate in sequence. In the flowing direction from the first medium communication port to the second medium communication port, at least one medium flow channel, closest to the electrode terminal in the second direction, in the multiple medium flow channels is located on the upstream of other medium flow channels.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery device, an electrical device, and an energy storage device. Background Art

[0002] With the popularization and implementation of the concept of green development, new energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are also increasingly used in the energy storage field, etc.

[0003] During the use of a battery device, the battery cells inside the battery device generate heat. If this heat is too high, it will have an adverse impact on the performance and service life of the battery device. Moreover, in the existing battery system, the performance requirements for battery devices by humans are getting higher and higher. Among them, the temperature difference between different regions of the battery device is one of the indicators for measuring the performance of the battery device. Therefore, how to improve the heat exchange efficiency of the heat exchange component while improving the temperature uniformity performance of the battery device is one of the research directions in the industry. Summary of the Invention

[0004] To solve the above technical problems, embodiments of the present application are expected to provide a battery device, an electrical device, and an energy storage device, which can improve the heat exchange efficiency of the heat exchange component while improving the temperature uniformity performance of the battery device.

[0005] Embodiments of the present application are implemented through the following technical solutions.

[0006] A first aspect of embodiments of the present application provides a battery device, including: A battery box; At least one battery cell assembly, where the battery cell assembly includes a plurality of battery cells arranged along a first direction, and each battery cell includes a housing and at least one electrode terminal, and the electrode terminal is provided at at least one end of the housing along a second direction; A heat exchange component, where the heat exchange component includes at least one heat exchange element, the heat exchange element is provided with a first medium communication port, a second medium communication port, and a medium flow path, both ends of the medium flow path are respectively communicated with the first medium communication port and the second medium communication port, the heat exchange element is disposed on at least one side of the battery cell assembly along a third direction, and the first direction, the second direction, and the third direction intersect with each other; Wherein, the medium flow path includes a plurality of medium flow channels spaced along the second direction, each medium flow channel extends along the first direction and is sequentially communicated, and along the flow direction from the first medium communication port to the second medium communication port, at least one of the medium flow channels closest to the electrode terminal in the second direction among the plurality of medium flow channels is located upstream of the other medium flow channels.

[0007] In the battery device provided by the embodiment of the present application, since at least one end of the housing in the second direction is provided with an electrode terminal, and the heat exchange member is arranged on at least one side of the battery cell assembly in the third direction, 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 exchange member for the electrode terminal. Since at least one medium flow channel closest to the electrode terminal in the second direction among the plurality of medium flow channels is located upstream of other medium flow channels along the flow direction from the first medium communication port to the second medium communication port, that is, during the process of the heat exchange medium being introduced into the medium flow path from the first medium communication port and flowing out of the medium flow path through the second medium communication port, 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 exchange member for the electrode terminal can be further improved, the temperature of the electrode terminal can be effectively reduced, the risk of thermal runaway of the battery cell can be reduced, the temperature difference of the battery cell can be shortened, the temperature uniformity performance of the battery cell can be improved, and during the charging process of the battery cell, overheating of the electrode terminal can be prevented to a certain extent, thereby improving the charging speed. Therefore, the battery device provided by the embodiment of the present application can improve the temperature uniformity performance of the battery device while improving the heat exchange efficiency of the heat exchange component.

[0008] In some embodiments, at least part of the medium flow channels include a plurality of sub-flow channels connected in parallel, the plurality of sub-flow channels are arranged at intervals in the second direction, and each sub-flow channel extends in the first direction.

[0009] Since the medium flow channel includes a plurality of sub-flow channels connected in parallel, the flow rate of the heat exchange medium can be increased, and compared with the case where all sub-flow channels are connected in series, the flow path of the heat exchange medium can also be shortened, thereby further improving the heat exchange efficiency.

[0010] In some embodiments, the electrode terminal includes a first electrode terminal and a second electrode terminal. The first electrode terminal is arranged at the first end of the housing in the second direction, and the second electrode terminal is arranged at the second end of the housing in the second direction. Along the flow direction from the first medium communication port to the second medium communication 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 other medium flow channels. Along the flow direction from the second medium communication port to the first medium communication port, the medium flow channel closest to the second electrode terminal in the second direction among the plurality of medium flow channels is located upstream of other medium flow channels.

[0011] Since the flow direction is from the first medium connection port to the second medium connection port, among the multiple medium flow channels, the medium flow channel closest to the first electrode terminal in the second direction is upstream of the other medium flow channels. That is to say, the first medium connection port is connected to the medium flow channel closest to the first electrode terminal in the second direction. In other words, the heat exchange medium first flows into the medium flow channel closest to the first electrode terminal through the first medium connection port, which is beneficial to improving the heat exchange efficiency of the first electrode terminal. Since the flow direction is from the second medium connection port to the first medium connection port, among the multiple medium flow channels, the medium flow channel closest to the second electrode terminal in the second direction is upstream of the other medium flow channels. That is to say, the second medium connection port is connected to the medium flow channel closest to the second electrode terminal in the second direction. In other words, the heat exchange medium can first flow into the medium flow channel closest to the second electrode terminal through the second medium connection port, which is beneficial to improving the heat exchange efficiency of the second electrode terminal. In this way, to a certain extent, the distance between the medium flow channel and the first electrode terminal and the second electrode terminal can be shortened, thereby improving the heat exchange efficiency of the heat exchange member for the first electrode terminal and the second electrode terminal. In addition, the flow direction of the heat exchange medium in the medium flow path can be reversed so that the heat exchange medium first flows into the medium flow channel closest to the first electrode terminal through the first medium connection port, or first flows into the medium flow channel closest to the second electrode terminal through the second medium connection port. Therefore, the heat exchange efficiency of the heat exchange member for 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.

[0012] In some embodiments, the medium flow channel includes a first medium flow channel and a second medium flow channel. In the second direction, the first medium flow channel is closer to the first electrode terminal than the other medium flow channels, and the second medium flow channel is closer to the second electrode terminal than the other medium flow channels. The medium flow path further includes a connecting flow channel that extends in the second direction, and one end of the first medium flow channel facing away from the first medium connection port is directly connected to one end of the second medium flow channel facing away from the second medium connection port through the connecting flow channel.

[0013] In the second direction, since the first medium flow channel is arranged at the first end of the heat exchange member and is mainly used for heat exchange of the first electrode terminal, and the second medium flow channel is arranged at the second end of the heat exchange member and is mainly used for heat exchange of the second electrode terminal, and there is no other medium flow channel between the first medium flow channel and the second medium flow channel. In this way, it is beneficial to reduce the heat or cold loss of the heat exchange medium in other medium flow channels except the first medium flow channel and the second medium flow channel, thereby further improving the heat exchange efficiency of the heat exchange member for the first electrode terminal and the second electrode terminal. 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. In addition, the flow path of the heat exchange medium can be further shortened, thereby further improving the heat exchange efficiency of the heat exchange member.

[0014] In some embodiments, the first medium communication port and the second medium communication port are located on the same side of the heat exchange member along the first direction. The first medium communication port and the connection flow channel are located on different sides of the heat exchange member along the first direction.

[0015] Since the first medium communication port and the connection flow channel are located on different sides of the heat exchange member along the first direction, while increasing the heat exchange range of the heat exchange member, the flow path of the heat exchange system can be further simplified, and the structural compactness of the battery device can be improved.

[0016] In some embodiments, the heat exchange member includes 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 no medium flow channel is arranged in the second region. 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.

[0017] Since no medium flow channel is arranged in the second region, but the medium flow channels are concentrated in the first region and the third region, it is beneficial to reduce the heat or cold loss of the heat exchange medium in other medium flow channels except the first medium flow channel and the second medium flow channel, thereby further improving the heat exchange efficiency of the heat exchange member for the first electrode terminal and the second electrode terminal.

[0018] In some embodiments, the ratio of the size of the second region in the second direction to the size of the heat exchange member in the second direction is in the range of 0.3 to 0.8.

[0019] While concentrating the medium flow channels in the first region and the third region as much as possible, it is also possible to make the first region and the third region have a certain size for arranging the medium flow channels, so as to improve the heat exchange efficiency of the heat exchange member for the first electrode terminal and the second electrode terminal.

[0020] In some embodiments, the electrode terminals include a first electrode terminal and a second electrode terminal. 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. 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 arranged at intervals along the second direction and are provided on the same side of the battery cell assembly along the third direction. In the second direction, the first heat exchange member is closest to the first electrode terminal compared to other heat exchange members, and the second heat exchange member is closest to the second electrode terminal compared to other heat exchange members.

[0021] In the second direction, since the first heat exchange member is closest to the first electrode terminal compared to other heat exchange members, and the second heat exchange member is closest to the second electrode terminal compared to other heat exchange members, the first heat exchange member and the second heat exchange member can respectively exchange heat with the first electrode terminal and the second electrode terminal, thereby further improving the heat exchange efficiency of the heat exchange member for the first electrode terminal and the second electrode terminal.

[0022] In some embodiments, along the flow direction from the first medium communication port of the first heat exchange member to the second medium communication port of the first heat exchange member, the medium flow channel among the multiple medium flow channels of the first heat exchange member 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 exchange member. Along the flow direction from the first medium communication port of the second heat exchange member to the second medium communication port of the second heat exchange member, the medium flow channel among the multiple medium flow channels of the second heat exchange member 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 exchange member.

[0023] Due to the flow direction from the first medium communication port of the first heat exchanger to the second medium communication port of the first heat exchanger, among the multiple medium flow channels of the first heat exchanger, the medium flow channel closest to the first electrode terminal in the second direction is located upstream of the other medium flow channels of the first heat exchanger. That is to say, the first medium communication port of the first heat exchanger communicates with 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 first flows into the medium flow channel of the first heat exchanger closest to the first electrode terminal through the first medium communication port, which is beneficial to improving the heat exchange efficiency of the first heat exchanger for the first electrode terminal. Due to the flow direction from the first medium communication port of the second heat exchanger to the second medium communication port of the second heat exchanger, among the multiple medium flow channels of the second heat exchanger, the medium flow channel closest to the second electrode terminal in the second direction is located upstream of the other medium flow channels of the second heat exchanger. That is to say, the first medium communication port of the second heat exchanger communicates with 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 first flow into the medium flow channel of the second heat exchanger closest to the second electrode terminal through the first medium communication port of the second heat exchanger, which is beneficial to improving the heat exchange efficiency of the second heat exchanger for the second electrode terminal. In this way, to a certain extent, the distance between the medium flow channel and the first electrode terminal and the second electrode terminal can be shortened, thereby improving the heat exchange efficiency of the heat exchanger for the first electrode terminal and the second electrode terminal.

[0024] In some embodiments, when projected onto the same projection plane along the third direction, the projection of the medium flow channel in the second direction is within the projection range of the battery cell in the second direction.

[0025] In this way, the waste of heat or cold of the heat exchange medium in the medium flow channel can be minimized as much as possible, and the heat exchange medium in the medium flow channel can be fully utilized to exchange heat with the battery cell.

[0026] In some embodiments, the dimension of the housing along the first direction and the dimension of the housing along the third direction are smaller than the dimension of the battery cell along the second direction, and the dimension of the housing along the second direction is in the range of 300 mm to 1200 mm.

[0027] The capacitance of the battery device and the assembly efficiency can be taken into account.

[0028] In some embodiments, the heat exchanger 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 channel is defined between the protruding portion and the second heat exchange plate.

[0029] By protruding a partial area of the first heat exchange plate to form a protruding portion and forming a medium flow channel within the protruding portion, that is, the protruding portion can be set into a desired shape according to requirements, which is beneficial to improving the design flexibility of the medium flow channel. The size and path of the medium flow channel can be freely designed, which is applicable to complex scenarios with irregular heat source distribution or limited space, and is beneficial to further improving the heat exchange efficiency. In addition, by providing at least one heat exchange plate with a protruding portion to form a medium flow channel within the protruding portion, it is further beneficial to improve the design flexibility.

[0030] In some embodiments, the first heat exchange plate is connected to the second heat exchange plate by welding.

[0031] In this way, it is beneficial to improve the reliability of the connection structure between the first heat exchange plate and the second heat exchange plate.

[0032] In some embodiments, the battery cell assembly includes a first battery cell assembly and a second battery cell assembly, and the second battery cell assembly is located above the first battery cell assembly. At least one of the heat exchange members is disposed between the first battery cell assembly and the second battery cell assembly. A first mating plane is formed on a side of the second heat exchange plate facing away from the first heat exchange plate, the first mating plane faces the first battery cell assembly, and the protruding portion faces the second battery cell assembly. The heat exchange assembly further includes a heating member, and the heating member is disposed between the first mating plane and the first battery cell assembly.

[0033] In this embodiment, by disposing a heating member between the first mating plane and the first battery cell assembly to simultaneously heat the first battery cell assembly and the second battery cell assembly, the structure is simple, the cost is low, and it is beneficial to improve the heating efficiency. In addition, by forming a first mating plane on a side of the second heat exchange plate facing away from the first heat exchange plate, it is convenient to dispose the heating member so that the heating member can better fit with the heat exchange member.

[0034] In some embodiments, the battery device further includes a partition member, and the partition member is disposed in other areas of the first heat exchange plate except for the protruding portion, and the partition member abuts between the first heat exchange plate and the second battery cell assembly.

[0035] In this embodiment, by providing a partition member and abutting the partition member between the first heat exchange plate and the second battery cell assembly, the partition member can play a supporting role, thereby improving the situation where the second battery cell assembly presses on the medium flow channel, and further reducing the possibility of the second battery cell assembly crushing the medium flow channel, which is beneficial to improving the reliability of the battery device. In addition, the provision of the partition member can also block the adhesive, thereby improving the situation where the adhesive overflows to the outside of the battery cell assembly.

[0036] In some embodiments, a thermal conductive adhesive is filled between the electrode terminal and the heat exchange member.

[0037] In this way, it is beneficial to reduce the thermal resistance between the electrode terminal and the heat exchange member, improve the heat conduction efficiency between the electrode terminal and the heat exchange member, and thus improve the heat exchange efficiency of the electrode terminal.

[0038] In some embodiments, in the second direction, the minimum distance between the medium flow channel and the electrode terminal is in the range of 0 to 5 mm.

[0039] The distance between the medium flow channel and the electrode terminal can be shortened as much as possible, thereby improving the heat exchange efficiency of the heat exchange member for the electrode terminal.

[0040] In a second aspect of the embodiments of the present application, an electrical device is provided, and the electrical device includes the battery device described above.

[0041] Since it is possible to improve the heat exchange efficiency of the heat exchange component and at the same time improve the temperature uniformity performance of the battery device, it is beneficial to improve the reliability of the electrical device.

[0042] In a third aspect of the embodiments of the present application, an energy storage device is provided, and the energy storage device includes the battery device described above.

[0043] Since it is possible to improve the heat exchange efficiency of the heat exchange component and at the same time improve the temperature uniformity performance of the battery device, it is beneficial to improve the reliability of the energy storage device. Description of the Drawings

[0044] Figure 1 A schematic structural diagram of a vehicle provided by some embodiments of the present application; Figure 2 A schematic structural diagram of a battery device provided by some embodiments of the present application; Figure 3 A three-dimensional exploded view of a battery device provided by the first embodiment of the present application; Figure 4 A three-dimensional exploded view of a battery device provided by the second embodiment of the present application; Figure 5 A schematic structural diagram of a battery cell assembly provided by some embodiments of the present application; Figure 6 Schematic structural diagram of a heat exchanger provided in some embodiments of the present application; Figure 7 Schematic structural diagram of the cooperation between the heat exchanger and the battery cell provided in the first embodiment of the present application; Figure 8 For Figure 7 Enlarged view of part A in Figure 9 Schematic structural diagram of the cooperation between the heat exchanger and the battery cell provided in the second embodiment of the present application.

[0045] Description of reference numerals 10. Battery cell assembly; 11. Battery cell; 111. Electrode terminal; 1111. First electrode terminal; 1112. Second electrode terminal; 20. Battery box; 21. First box part; 22. Second box part; 30. Heat exchange assembly; 31. Heat exchanger; 311. Medium flow channel; 3111. First medium flow channel; 3112. Second medium flow channel; 3113. Sub-flow channel; 312. First medium communication port; 313. Second medium communication port; 315. First region; 316. Second region; 317. Third region; 318. Connection flow channel; 32. First heat exchanger; 33. Second heat exchanger; 34. Heating element; 40. Partition member; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed implementation manners

[0046] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and the above accompanying drawings of the present application are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", "fourth", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0049] Mentioning "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. If not otherwise specified, all embodiments and optional embodiments of the present application may be combined with each other to form a new technical solution. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments. If not otherwise specified, all technical features and optional technical features of the present application may be combined with each other to form a new technical solution.

[0050] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0052] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "projection" refers to the orthographic projection of parallel projection lines perpendicular to the projection plane.

[0055] Next, a detailed description of the present application will be given.

[0056] With the popularization and promotion of the concept of green development, new energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are also increasingly applied to energy storage fields and the like.

[0057] During charge and discharge, the electrode terminals of the battery cells generate a large amount of heat. In the related art, the traditional bottom cooling method cannot effectively reduce the temperature of the electrode posts, resulting in too large a temperature difference between the battery cells, which affects the performance and reliability of the battery device. Through research, it can be achieved by shortening the distance between the medium flow channel and the electrode terminal and making the heat exchange medium flow through the medium flow channel closest to the electrode terminal first, so as to improve the heat exchange efficiency of the heat exchange component and the uniform temperature performance of the battery device at the same time.

[0058] Based on such a design concept, an embodiment of the present application provides a battery device, which includes a battery box, a heat exchange component, and at least one battery cell component. The battery cell component includes a plurality of battery cells arranged in a first direction. Each battery cell includes a housing and at least one electrode terminal, and the electrode terminal is provided at at least one end of the housing along a second direction. The heat exchange component includes at least one heat exchange member, and the heat exchange member is 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 are respectively communicated with the first medium communication port and the second medium communication port. The heat exchange member is disposed on at least one side of the battery cell component along a third direction, and the first direction, the second direction, and the third direction intersect with each other. Among them, the medium flow path includes a plurality of medium flow channels arranged at intervals along the second direction, and each medium flow channel extends along the first direction and is sequentially communicated. Along the flow direction from the first medium communication port to the second medium communication port, at least one medium flow channel closest to the electrode terminal in the second direction among the plurality of medium flow channels is located upstream of the other medium flow channels.

[0059] In the battery device provided by the embodiment of the present application, since at least one end of the housing in the second direction is provided with an electrode terminal, and the heat exchange member is disposed on at least one side of the battery cell assembly in the third direction, to a certain extent, the distance between the medium flow channel and the electrode terminal can be shortened, thereby improving the heat exchange efficiency of the heat exchange member for the electrode terminal. Since along the flow direction from the first medium communication port to the second medium communication port, at least one medium flow channel closest to the electrode terminal in the second direction among the plurality of medium flow channels is located upstream of the other medium flow channels, that is, during the process of the heat exchange medium being introduced into the medium flow path from the first medium communication port and being discharged from the medium flow path through the second medium communication port, 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 exchange member for the electrode terminal can be further improved, effectively reducing the temperature of the electrode terminal, reducing the risk of thermal runaway of the battery cell, shortening the temperature difference of the battery cell, improving the temperature uniformity performance of the battery cell, and to a certain extent, preventing the electrode terminal from overheating during the charging process of the battery cell, thereby increasing the charging speed. Therefore, the battery device provided by the embodiment of the present application can improve the temperature uniformity performance of the battery device while improving the heat exchange efficiency of the heat exchange component.

[0060] The battery device provided by the embodiment of the present application can be but is not limited to being used in power-consuming devices such as vehicles, ships, or aircraft.

[0061] The battery device provided by the embodiment of the present application can also be used in energy storage devices, and the energy storage devices can include energy storage containers, energy storage cabinets, etc.

[0062] The embodiment of the present application also provides a power-consuming device including the above battery device. The power-consuming device can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0063] In the following embodiments, for the convenience of description, the power-consuming device in an embodiment of the present application is taken as an example of a vehicle for illustration.

[0064] Please refer to Figure 1, inside the vehicle 1000, a controller 200, a motor 300, and a battery device 100 can be provided. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be provided at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can serve as the operating power source of the vehicle 1000 and be used for the circuit system of the vehicle 1000, such as the working power requirements for starting, navigation, and running of the vehicle 1000.

[0065] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000 but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0066] The battery device 100 (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 (Battery Cell Assembly) may include a plurality of battery cells 11, and the plurality of battery cells 11 are connected in series, parallel, or in a hybrid connection through a busbar component.

[0067] In some embodiments, the battery cell assembly 10 (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells 11; as an example, the battery cell assembly 10 can be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 11 to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 11 with cable ties.

[0068] In some embodiments, the battery device 100 can be a battery pack (battery Pack), and the battery pack includes a battery box 20 and one or more battery cell assemblies 10, and the battery cell assembly 10 is accommodated in the battery box 20.

[0069] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be accommodated in the battery box 20 by fixing the battery module in the battery box 20.

[0070] As an example, the battery cell assembly 10 can also be accommodated in the box by directly fixing a plurality of battery cells 11 to the battery box 20.

[0071] In the embodiments of the present application, the battery cell 11 can be a secondary battery, and a secondary battery refers to a battery cell 11 that can be activated by charging after discharging to continue to be used.

[0072] The battery cell 11 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0073] The battery cell 11 generally 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) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent short circuit between the positive and negative electrodes and allow active ions to pass through at the same time.

[0074] In some embodiments, the positive electrode can be a positive electrode plate, and the positive electrode plate can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0075] In some embodiments, the negative electrode can be a negative electrode plate, and the negative electrode plate can include a negative electrode current collector.

[0076] In some embodiments, the electrode assembly further includes a separator, and the separator is disposed between the positive electrode and the negative electrode.

[0077] In some embodiments, the separator is a separator membrane. The embodiments of the present application do not have special limitations on the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0078] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and plays the role of transmitting ions and isolating the positive and negative electrodes at the same time.

[0079] In some embodiments, the battery cell 11 further includes an electrolyte, and the electrolyte plays the role of conducting ions between the positive and negative electrodes. The embodiments of the present application do not have specific limitations on the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like or solid.

[0080] In some embodiments, the electrode assembly is a wound structure. The positive electrode plate and the negative electrode plate are wound into a wound structure.

[0081] In some embodiments, the electrode assembly is a stacked structure.

[0082] As an example, multiple positive electrode plates and multiple negative electrode plates can be respectively provided, and the multiple positive electrode plates and the multiple negative electrode plates are alternately stacked.

[0083] As an example, multiple positive electrode plates can be provided, and the negative electrode plate is folded to form multiple folded segments arranged in a stacked manner, and a positive electrode plate is clamped between adjacent folded segments.

[0084] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folding segments.

[0085] As an example, a plurality of separators may be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0086] As an example, the separators may be continuously provided and are disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0087] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0088] In some embodiments, the battery cell 11 may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0089] 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. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell. The multi-prismatic battery cell is, for example, a hexagonal prismatic battery cell, etc. There is no particular limitation in the embodiments of the present application.

[0090] 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.

[0091] Next, with reference to Figures 2 to 9 Some embodiments of the present application will be described in detail.

[0092] In the description of the embodiments of the present application, for the convenience of description, the direction where the arrow X is located is used to represent the "first direction", the direction where the arrow Y is located is used to represent the "second direction", and the direction where the arrow Z is located is used to represent the "third direction". Among them, the first direction X, the second direction Y, and the third direction Z intersect pairwise and the three directions are not coplanar. In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other pairwise.

[0093] Please refer to Figures 2 to 9, an embodiment of the present application provides a battery device 100, which includes a battery box body 20, a heat exchange component 30, and at least one battery cell component 10. The battery cell component 10 includes a plurality of battery cells 11 arranged along a first direction. The battery cell 11 includes a housing and at least one electrode terminal 111, and the electrode terminal 111 is provided at at least one end of the housing along a second direction. The heat exchange component 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, and both ends of the medium flow path are respectively communicated with the first medium communication port 312 and the second medium communication port 313. The heat exchange element 31 is provided on at least one side of the battery cell component 10 along a third direction, and the first direction, the second direction, and the third direction intersect with each other. Wherein, the medium flow path includes a plurality of medium flow channels 311 arranged at intervals along the second direction, and each medium flow channel 311 extends along the first direction and is sequentially communicated. Along the flow direction from the first medium communication port 312 to the second medium communication port 313, at least one medium flow channel 311 closest to the electrode terminal 111 in the second direction among the plurality of medium flow channels 311 is located upstream of the other medium flow channels 311.

[0094] Exemplarily, as Figures 3 to 5 shown, an electrode terminal 111 is provided on the housing, and the electrode terminal 111 partially penetrates the housing and is electrically connected to the electrode assembly through a tab.

[0095] Exemplarily, the material of the electrode terminal 111 is a conductive metal material, such as copper or aluminum.

[0096] The bus bar can export the current of the battery cell 11 to other electrical components.

[0097] Exemplarily, the material of the bus bar can be pure aluminum material or copper-aluminum composite material, etc.

[0098] Exemplarily, the bus bar is welded to the electrode terminal 111.

[0099] Exemplarily, the battery cell 11 includes two electrode terminals 111 with opposite electrodes, and the two electrode terminals 111 with opposite electrodes respectively introduce or export current through different bus bars.

[0100] The number of the battery cell components 10 can be one or multiple.

[0101] The number of the heat exchange elements 31 can be one or multiple.

[0102] The housing can be provided with an electrode terminal 111 at one end along the second direction, or can be provided with electrode terminals 111 at both ends along the second direction.

[0103] The battery cell assembly 10 includes a plurality of battery cells 11 arranged in a first direction. At least one end of the housing in a second direction is provided with an electrode terminal 111. The heat exchange member 31 is disposed on at least one side of the battery cell assembly 10 in a third direction. That is to say, the heat exchange member 31 is disposed on the side of the electrode terminals 111 of all the battery cells 11 of the battery cell assembly 10. Therefore, the distance between the heat exchange member 31 and the electrode terminal 111 can be shortened.

[0104] The heat exchange member 31 can be disposed on one side of the battery cell assembly 10 in the third direction, or can be disposed on both sides of the battery cell assembly 10 in the third direction.

[0105] In an embodiment where electrode terminals 111 are provided at both ends of the housing in the second direction, that is, only one electrode terminal 111 is provided at each end of the housing in the second direction, the electrode terminal 111 is disposed in a region of the housing close to the heat exchange member 31 in the third direction (as Figure 3 shown). Therefore, 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 exchange member 31 for the electrode terminal 111.

[0106] Specifically, the electrode terminal 111 is disposed in a region between the middle of the housing in the third direction and the heat exchange member 31.

[0107] As Figures 6 to 9 shown, both ends of the medium flow path are respectively communicated with a first medium communication port 312 and a second medium communication port 313. That is to say, the first medium communication port 312 and the second medium communication port 313 are used to introduce or export the heat exchange medium into or out of the medium flow path.

[0108] One of the first medium communication port 312 and the second medium communication port 313 is a medium inlet, and the other is a medium outlet. Exemplarily, the first medium communication port 312 can be a medium inlet and the second medium communication port 313 can be a medium outlet. It can also be that the first medium communication port 312 is a medium outlet and the second medium communication port 313 is a medium inlet. It can also be to exchange the direction of introducing or exporting the heat exchange medium according to requirements. That is, in the first state, the first medium communication port 312 is a medium inlet and the second medium communication port 313 is a medium outlet. In the second state, the first medium communication port 312 is a medium outlet and the second medium communication port 313 is a medium inlet.

[0109] Each medium flow channel 311 extends in the first direction, that is, each medium flow channel 311 extends along the arrangement direction of the battery cells 11 in the battery cell assembly 10. Therefore, the medium flow channel 311 can simultaneously exchange heat for all the battery cells 11 of the battery cell assembly 10.

[0110] The respective medium flow channels 311 are arranged at intervals along the second direction and are connected in sequence. That is to say, the respective medium flow channels 311 are connected in series to achieve the circulating flow of the heat exchange medium.

[0111] As Figure 3 shown, in the embodiment where the housing is provided with the electrode terminal 111 only at one end along the second direction, only one of the multiple medium flow channels 311 is closest to the electrode terminal 111 in the second direction, that is, the outermost medium flow channel 311 on the side where the electrode terminal 111 is provided in the second direction.

[0112] As Figures 7 to 8 shown, in the embodiment where the housing is provided with the electrode terminals 111 at both ends along the second direction, thus, two of the multiple medium flow channels 311 are closest to the electrode terminals 111 in the second direction, which are respectively the two outermost medium flow channels 311 among the multiple medium flow channels 311 in the second direction.

[0113] Due to the flow direction from the first medium communication port 312 to the second medium communication port 313, at least one of the multiple medium flow channels 311 closest to the electrode terminal 111 in the second direction is located upstream of the other medium flow channels 311. That is to say, the first medium communication port 312 is connected to the medium flow channel 311 closest to the electrode terminal 111 in the second direction. In other words, the heat exchange medium first flows into the medium flow channel 311 closest to the electrode terminal 111 through the first medium communication port 312.

[0114] Taking the heat exchange medium for cooling the battery cell 11 as an example for description, the heat exchange medium with a lower temperature flows into the medium flow path through the first medium communication port 312 and absorbs the heat of the battery cell 11 during the process of flowing in the medium flow path to cool the battery cell 11. At the same time, the temperature of the heat exchange medium gradually increases, resulting in a gradual reduction 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 communication port 312 to directly cool the electrode terminal 111. At this time, the temperature of the heat exchange medium is relatively low, thereby improving the heat exchange efficiency of the heat exchange member 31 for the electrode terminal 111, 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, and improving the temperature uniformity performance of the battery cell 11.

[0115] In addition, in the case of high-rate fast charging, the cooling of the position of the electrode terminal 111 can effectively prevent overheating, thereby increasing the charging speed and reducing the charging time. Thus, the problem of large heat generation of the electrode terminal 111 during high-rate charge and discharge can be solved.

[0116] Exemplarily, the first medium connection port 312 and the second medium connection port 313 can be used for connecting to the pipeline of the air conditioning system or the liquid storage device such as a water tank of the whole vehicle or the electrical equipment.

[0117] It should be noted that the specific type of the 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 gaseous or liquid. In the embodiments of the present application, the heat exchange medium is taken as a coolant for description.

[0118] The principle of the heat exchange component 30 for heat exchanging the battery cell component 10 is as follows: The heat exchange medium output from a heat exchange medium source (not shown in the figure) enters the medium flow channel 311 through the inlet of the heat exchange component 30. After the heat exchange medium exchanges heat with the battery cell component 10, the heat exchange medium flows out through the outlet of the heat exchange component 30, completing the heat exchange of the battery cell component 10.

[0119] Here, the heat exchange component 30 for heat exchanging the battery cell component 10 can dissipate heat from the battery cell component 10 or can also heat the battery cell component 10.

[0120] The principle of the heat exchange component 30 for dissipating heat from the battery cell component 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 the battery cell component 10, the heat exchange medium flows out through the medium outlet of the heat exchange component 30, releasing heat and completing the cooling and heat dissipation of the battery cell component 10.

[0121] The principle of the heat exchange component 30 for heating the battery cell component 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. The heat exchange medium transfers heat to the battery cell component 10 to achieve heating of the battery cell component 10. After that, the heat exchange medium flows out through the medium outlet of the heat exchange component 30, completing the heating of the battery cell component 10.

[0122] In the battery device 100 provided by the embodiment of the present application, since at least one end of the housing in the second direction is provided with an electrode terminal 111, and the heat exchange member 31 is disposed on at least one side of the battery cell assembly 10 in the third direction, to a certain extent, the distance between the medium flow channel 311 and the electrode terminal 111 can be shortened, thereby improving the heat exchange efficiency of the heat exchange member 31 for the electrode terminal 111. Since along the flow direction from the first medium communication port 312 to the second medium communication port 313, at least one medium flow channel 311 closest to the electrode terminal 111 in the second direction among the plurality of medium flow channels 311 is located upstream of the other medium flow channels 311, that is to say, during the process of the heat exchange medium being introduced into the medium flow path from the first medium communication port 312 and being exported from the medium flow path through the second medium communication port 313, 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 member 31 for 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 performance of the battery cell 11, and to a certain extent, preventing the electrode terminal 111 from overheating during the charging process of the battery cell 11, thereby increasing the charging speed. Therefore, the battery device 100 provided by the embodiment of the present application can improve the temperature uniformity performance of the battery device 100 while improving the heat exchange efficiency of the heat exchange assembly 30.

[0123] In some embodiments, please refer to Figures 6 to 8 , at least some of the medium flow channels 311 include a plurality of sub-flow channels 3113 connected in parallel, and the plurality of sub-flow channels 3113 are spaced apart in the second direction, and each sub-flow channel 3113 extends in the first direction.

[0124] It may be that some of the medium flow channels 311 include a plurality of sub-flow channels 3113 connected in parallel, or all of the medium flow channels 311 include a plurality of sub-flow channels 3113 connected in parallel.

[0125] Exemplarily, the sub-flow channels 3113 of the same medium flow channel 311 are evenly distributed in the second direction, facilitating the uniform flow of the heat exchange medium in the medium flow channel 311.

[0126] Since the medium flow channel 311 includes a plurality of sub-flow channels 3113 connected in parallel, the flow rate of the heat exchange medium can be increased, and moreover, compared with the case where all the sub-flow channels 3113 are connected in series, the flow path of the heat exchange medium can also be shortened, thereby further improving the heat exchange efficiency.

[0127] In some embodiments, please refer to Figures 5 to 9, the electrode terminal 111 includes a first electrode terminal 1111 and a second electrode terminal 1112. The first electrode terminal 1111 is provided at the first end of the housing along the second direction, and the second electrode terminal 1112 is provided at the second end of the housing along the second direction. Along the flow direction from the first medium communication port 312 to the second medium communication port 313, among the plurality of medium flow channels 311, 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 communication port 313 to the first medium communication port 312, among the plurality of medium flow channels 311, 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.

[0128] Exemplarily, the polarities of the first electrode terminal 1111 and the second electrode terminal 1112 are opposite, and the first electrode terminal 1111 and the second electrode terminal 1112 respectively introduce or extract current through different bus bars.

[0129] Exemplarily, an insulating sheet is provided between the heat exchanger 31 and the bus bar to prevent short circuits. At the same time, a thermally conductive structural adhesive is filled between the heat exchanger 31 and the insulating sheet to ensure heat conduction while meeting the insulation requirements.

[0130] Due to the flow direction from the first medium connecting port 312 to the second medium connecting port 313, the medium flow channel 311 closest to the first electrode terminal 1111 in the second direction among the multiple medium flow channels 311 is located upstream of the other medium flow channels 311, that is, the first medium connecting 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 first flows into the medium flow channel 311 closest to the first electrode terminal 1111 through the first medium connecting port 312, which is beneficial to improving the heat exchange efficiency of the first electrode terminal 1111. Since the medium flow channel 311 closest to the second electrode terminal 1112 in the second direction among the plurality of medium flow channels 311 is located upstream of the other medium flow channels 311 along the flow direction from the second medium communication port 313 to the first medium communication port 312, that is, the second medium communication 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 first flow into the medium flow channel 311 closest to the second electrode terminal 1112 through the second medium communication port 313, which is beneficial to improve the heat exchange efficiency for 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 exchange element 31 to the first electrode terminal 1111 and the second electrode terminal 1112. In addition, the flow direction of the heat exchange medium in the medium flow path can be changed so that the heat exchange medium first flows into the medium flow channel 311 closest to the first electrode terminal 1111 through the first medium connecting port 312, or first flows into the medium flow channel 311 closest to the second electrode terminal 1112 through the second medium connecting port 313. Therefore, the heat exchange efficiency of the heat exchange element 31 for the first electrode terminal 1111 and the second electrode terminal 1112 can be further improved. While effectively reducing the temperatures 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 can be shortened, thereby further improving the temperature uniformity performance of the battery cell 11.

[0131] In some embodiments, see Figures 6 to 8 , the medium flow channel 311 includes a first medium flow channel 3111 and a second medium flow channel 3112. In the second direction, the first medium flow channel 3111 is closest to the first electrode terminal 1111 compared to other medium flow channels 311, and the second medium flow channel 3112 is closest to the second electrode terminal 1112 compared to other medium flow channels 311. The medium flow path also includes a connecting flow channel 318, which extends along the second direction, and an end of the first medium flow channel 3111 away from the first medium communication port 312 is directly connected to an end of the second medium flow channel 3112 away from the second medium communication port 313 through the connecting flow channel 318.

[0132] As used herein, the term "direct connection" 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 connection flow channel 318, that is, there is no other medium flow channel 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.

[0133] That is to say, in the second direction, the first medium flow channel 3111 is arranged at the first end of the heat exchange member 31 and is mainly used for heat exchange of the first electrode terminal 1111, and the second medium flow channel 3112 is arranged at the second end of the heat exchange member 31 and is mainly used for heat exchange of the second electrode terminal 1112.

[0134] Since 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 through the connection flow channel 318, that is to say, the first medium flow channel 3111 and the second medium flow channel 3112 are connected in series through the connection flow channel 318, and the heat exchange medium is circulated between the first medium flow channel 3111 and the second medium flow channel 3112.

[0135] In the second direction, since the first medium flow channel 3111 is arranged at the first end of the heat exchange member 31 and is mainly used for heat exchange of the first electrode terminal 1111, the second medium flow channel 3112 is arranged at the second end of the heat exchange member 31 and is mainly used for heat exchange of the second electrode terminal 1112, and there is no other medium flow channel 311 between the first medium flow channel 3111 and the second medium flow channel 3112. Thus, it is beneficial to reduce the heat or cold loss of the heat exchange medium in other medium flow channels 311 except the first medium flow channel 3111 and the second medium flow channel 3112, so as to further improve the heat exchange efficiency of the heat exchange member 31 for the first electrode terminal 1111 and the second electrode terminal 1112. While effectively reducing the temperatures 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. In addition, the flow path of the heat exchange medium can be further shortened, thereby further improving the heat exchange efficiency of the heat exchange member 31.

[0136] 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 exchange member 31 along the first direction. The first medium connection port 312 and the connection flow channel 318 are located on different sides of the heat exchange member 31 along the first direction.

[0137] Since the first medium communication port 312 and the second medium communication port 313 are located on the same side of the heat exchange member 31 along the first direction, it is convenient for the heat exchange member 31 to communicate with the outside through the first medium communication port 312 and the second medium communication port 313, which is beneficial to simplifying the flow path of the heat exchange system and improving the structural compactness of the battery device 100.

[0138] The first medium communication port 312 and the connecting flow channel 318 are located on different sides of the heat exchange member 31 along the first direction, that is, the first medium communication port 312 and the connecting flow channel 318 are located on opposite sides of the heat exchange member 31 along the first direction, and the second medium communication port 313 and the connecting flow channel 318 are also located on opposite sides of the heat exchange member 31 along the first direction.

[0139] Since the first medium communication port 312 and the connecting flow channel 318 are located on different sides of the heat exchange member 31 along the first direction, while increasing the heat exchange range of the heat exchange member 31, the flow path of the heat exchange system can be further simplified, and the structural compactness of the battery device 100 can be improved.

[0140] In some embodiments, please refer to Figure 6 , the heat exchange member 31 includes a first region 315, a second region 316, and a third region 317 arranged in sequence along the second direction. The first medium flow channel 3111 is provided in the first region 315, the second medium flow channel 3112 is provided in the third region 317, and no medium flow channel 311 is provided in the second region 316. 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.

[0141] That is to say, no medium flow channel 311 is provided in the second region 316 between the first region 315 and the third region 317, but the medium flow channel 311 is concentrated in the first region 315 and the third region 317.

[0142] Exemplarily, the first region 315 is provided on the side of the heat exchange member 31 close to the first electrode terminal 1111, the third region 317 is provided on the side of the heat exchange member 31 close to the second electrode terminal 1112, and the second region 316 is provided between the first region 315 and the third region 317.

[0143] It should be noted that the sizes of the first region 315 and the third region 317 in the first direction are not limited here. The size of the first region 315 in the first direction may be equal to the size of the third region 317 in the first direction, may be smaller than the size of the third region 317 in the first direction, or may be larger than the size of the third region 317 in the first direction.

[0144] Since 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 greater than or equal to the dimension of the third region 317 in the first direction, it is beneficial to further concentrate the medium flow channel 311 within a smaller range, thereby further reducing the heat or cold loss of the heat exchange medium, and then concentrating the heat exchange on the first electrode terminal 1111 and the second electrode terminal 1112.

[0145] Since the medium flow channel 311 is not provided in the second region 316 but is 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 except the first medium flow channel 3111 and the second medium flow channel 3112, thereby further improving the heat exchange efficiency of the heat exchange member 31 for the first electrode terminal 1111 and the second electrode terminal 1112.

[0146] In some embodiments, refer to Figure 6 , the ratio of the dimension of the second region 316 in the second direction to the dimension of the heat exchange member 31 in the second direction is in the range of 0.3 to 0.8.

[0147] The ratio of the dimension of the second region 316 in the second direction to the dimension of the heat exchange member 31 in the second direction can be a point value of 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 a point value between any two of them.

[0148] Since the ratio of the dimension of the second region 316 in the second direction to the dimension of the heat exchange member 31 in the second direction is in the range of 0.3 to 0.8, while concentrating the medium flow channel 311 as much as possible in the first region 315 and the third region 317, it can also enable the first region 315 and the third region 317 to have a certain dimension for setting the medium flow channel 311, so as to improve the heat exchange efficiency of the heat exchange member 31 for the first electrode terminal 1111 and the second electrode terminal 1112.

[0149] In some embodiments, refer to Figure 6 , the ratio of the dimension of the first region 315 in the second direction to the dimension of the heat exchange member 31 in the second direction is in the range of 0.1 to 0.6.

[0150] In some embodiments, refer to Figure 6 , the ratio of the dimension of the third region 317 in the second direction to the dimension of the heat exchange member 31 in the second direction is in the range of 0.1 to 0.6.

[0151] In some embodiments, refer to Figure 9, the electrode terminal 111 includes a first electrode terminal 1111 and a second electrode terminal 1112. The first electrode terminal 1111 is provided at the first end of the housing along the second direction, and the second electrode terminal 1112 is provided at the 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 provided 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 other heat exchangers 31, and the second heat exchanger 33 is closest to the second electrode terminal 1112 compared to other heat exchangers 31.

[0152] Exemplarily, the first heat exchanger 32 and the second heat exchanger 33 can be connected and communicated through a connecting pipe.

[0153] Exemplarily, the first heat exchanger 32 and the second heat exchanger 33 may not be connected and communicated, but directly connected to the pipelines of a liquid storage device such as an air conditioning system or a water tank of a vehicle or an electrical device.

[0154] In the second direction, since the first heat exchanger 32 is closest to the first electrode terminal 1111 compared to other heat exchangers 31, and the second heat exchanger 33 is closest to the second electrode terminal 1112 compared to other heat exchangers 31, the first electrode terminal 1111 and the second electrode terminal 1112 can be heat exchanged through the first heat exchanger 32 and the second heat exchanger 33 respectively, thereby further improving the heat exchange efficiency of the heat exchanger 31 for the first electrode terminal 1111 and the second electrode terminal 1112.

[0155] In some embodiments, please refer to Figure 9 , along the flow direction from the first medium communication port 312 to the second medium communication 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 multiple 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 communication port 312 to the second medium communication 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 multiple 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.

[0156] Due to the flow direction from the first medium communication port 312 to the second medium communication port 313 of the first heat exchange member 32, among the multiple medium flow channels 311 of the first heat exchange member 32, the medium flow channel 311 closest to the first electrode terminal 1111 in the second direction is upstream of the other medium flow channels 311 of the first heat exchange member 32. That is to say, the first medium communication port 312 of the first heat exchange member 32 communicates with the medium flow channel 311 of the first heat exchange member 32 closest to the first electrode terminal 1111 in the second direction. In other words, the heat exchange medium first flows into the medium flow channel 311 of the first heat exchange member 32 closest to the first electrode terminal 1111 through the first medium communication port 312, which is beneficial to improving the heat exchange efficiency of the first heat exchange member 32 for the first electrode terminal 1111. Due to the flow direction from the first medium communication port 312 to the second medium communication port 313 of the second heat exchange member 33, among the multiple medium flow channels 311 of the second heat exchange member 33, the medium flow channel 311 closest to the second electrode terminal 1112 in the second direction is upstream of the other medium flow channels 311 of the second heat exchange member 33. That is to say, the first medium communication port 312 of the second heat exchange member 33 communicates with the medium flow channel 311 of the second heat exchange member 33 closest to the second electrode terminal 1112 in the second direction. In other words, the heat exchange medium can first flow into the medium flow channel 311 of the second heat exchange member 33 closest to the second electrode terminal 1112 through the first medium communication port 312 of the second heat exchange member 33, which is beneficial to improving the heat exchange efficiency of the second heat exchange member 33 for the second electrode terminal 1112. In this way, 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 exchange member 31 for the first electrode terminal 1111 and the second electrode terminal 1112.

[0157] In some embodiments, please refer to Figures 6 to 9 , when projected onto the same projection plane along the third direction, the projection of the medium flow channel 311 in the second direction is within the projection range of the battery cell 11 in the second direction.

[0158] That is to say, the dimension of the region of the heat exchange member 31 where the medium flow channel 311 is formed in the second direction is less than or equal to the dimension of the battery cell 11 in the second direction.

[0159] That is to say, in the second direction, the medium flow channel 311 is located between the first electrode terminal 1111 and the second electrode terminal 1112.

[0160] In this way, the waste of heat or cold of the heat exchange medium in the medium flow channel 311 can be minimized as much as possible, and the heat exchange medium in the medium flow channel 311 can be fully utilized to exchange heat with the battery cell 11.

[0161] In some embodiments, please refer toFigure 5 The dimension h1 of the housing along the first direction and the dimension 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 300 mm to 1200 mm.

[0162] The dimension of the housing along the second direction can be a point value of any one of 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, 560 mm, 600 mm, 660 mm, 700 mm, 750 mm, 800 mm, 820 mm, 860 mm, 900 mm, 950 mm, 1000 mm, 1060 mm, 1100 mm, 1150 mm, 1200 mm or a point value between any two of them.

[0163] Here, h1, h2 and h3 can be measured by measuring tools such as vernier calipers at normal temperature before the battery device 100 is used.

[0164] It should be noted that h1, h2 and h3 do not include the dimensions of the electrode terminal 111 and / or the pressure relief structure, that is, h1, h2 and h3 can be obtained by measuring the dimensions of the outer shell of the battery cell 11.

[0165] In this embodiment, by setting the dimension of the housing along the second direction to be in the range of 300 mm to 1200 mm, the capacitance and assembly efficiency of the battery device 100 can be taken into account.

[0166] Exemplarily, the battery cell 11 in this embodiment can be a blade battery, which is long and thin in shape.

[0167] It can be that the dimension of the housing along the third direction is greater than the dimension of the housing along the first direction, or the dimension of the housing along the third direction is smaller than the dimension of the housing along the first direction, or the dimension of the housing along the third direction is equal to the dimension of the housing along the first direction.

[0168] It can be understood that while facilitating the stacking of the battery cells 11 along the first direction, it is also possible to facilitate the stacking of the battery cells 11 along the third direction, that is, the number of battery cells 11 can be increased in the first direction and the third direction to increase the capacitance of the battery device 100.

[0169] In some embodiments, the heat exchange member 31 includes a first heat exchange plate and a second heat exchange plate. A part 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 a medium flow channel 311 is defined between the protrusion and the second heat exchange plate.

[0170] By protruding a partial area of the first heat exchange plate to form a convex portion and forming a medium flow channel 311 within the convex portion, that is to say, the convex portion can be set into a desired shape according to requirements, which is conducive to improving the design flexibility of the medium flow channel 311. The size and path of the medium flow channel 311 can be freely designed, applicable to complex scenarios with irregular heat source distribution or limited space, which is conducive to further improving the heat exchange efficiency. In addition, by providing at least one heat exchange plate with a convex portion to form a medium flow channel 311 within the convex portion, it is further conducive to enhancing the design flexibility.

[0171] Since only a partial area of the first heat exchange plate needs to be protruded to form a convex portion and the second heat exchange plate does not need to form a convex portion, it is conducive to reducing the process of forming a convex portion on the second heat exchange plate and can also reduce the positioning difficulty between the first heat exchange plate and the second heat exchange plate, which is conducive to improving production efficiency.

[0172] Exemplarily, the medium flow channel 311 includes a bent section.

[0173] Here, according to the heat distribution or space distribution of the battery cell 11, the size and path of the medium flow channel 311 can be freely designed. For example, by setting the medium flow channel 311 to include a bent section, it is conducive to improving the heat exchange efficiency and the convenience of assembly.

[0174] Exemplarily, the first heat exchange plate can form a convex portion by stamping.

[0175] Here, the specific materials of the first heat exchange plate and the second heat exchange plate are not limited herein.

[0176] In some embodiments, the first heat exchange plate and the second heat exchange plate are provided as metal plates. Exemplarily, the materials of the first heat exchange plate and the second heat exchange plate can be, for example, aluminum alloy, steel, etc.

[0177] The materials of the first heat exchange plate and the second heat exchange plate can be the same or different.

[0178] In this embodiment, by providing the first heat exchange plate and the second heat exchange plate as metal plates, the metal plates not only have good structural strength but also have good thermal conductivity. That is to say, while meeting a certain heat exchange efficiency of the first heat exchange plate and the second heat exchange plate, the first heat exchange plate and the second heat exchange plate can also have a certain structural strength.

[0179] Exemplarily, the first heat exchange plate and the second heat exchange plate are connected by welding. That is to say, the first heat exchange plate and the second heat exchange plate are connected by welding to form a heat exchange member 31. In this way, it is conducive to enhancing the reliability of the connection structure between the first heat exchange plate and the second heat exchange plate.

[0180] Exemplarily, the heat exchange plates are connected by brazing.

[0181] Brazing can combine dissimilar metals (such as aluminum matrix composites) through a hot rolling composite process, enabling the material to possess high mechanical strength, corrosion resistance, and anti-fatigue characteristics, making it suitable for load-bearing and harsh environments. Additionally, the brazed joints have good airtightness and liquid tightness, supporting the dissimilar connection of various metals and alloys. Moreover, the size and path of the medium flow channel 311 can be freely designed, making it applicable to complex scenarios with irregular heat source distributions or limited space.

[0182] In some embodiments, referring to Figures 3 to 4 , the battery cell assembly 10 includes a first battery cell assembly and a second battery cell assembly, and the second battery cell assembly is located above the first battery cell assembly. At least one heat exchange member 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 facing away from the first heat exchange plate, and the first mating plane faces the first battery cell assembly, with the protruding portion facing the second battery cell assembly. The heat exchange assembly 30 further includes a heating member 34, and the heating member 34 is disposed between the first mating plane and the first battery cell assembly.

[0183] In addition to the first battery cell assembly and the second battery cell assembly, the battery cell assembly 10 may further include other battery cell assemblies 10. For example, it may further include a third battery cell assembly 10, etc. The third battery cell assembly 10 may be located below the first battery cell assembly or above the second battery cell assembly.

[0184] A heat exchange member 31 is disposed between the first battery cell assembly and the second battery cell assembly.

[0185] 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. A first mating plane is formed on the side of the second heat exchange plate facing away from the first heat exchange plate. That is to say, the first mating plane is used to cooperate with the first battery cell assembly, and the protruding portion is disposed on the side of the heat exchange member 31 facing the second battery cell assembly.

[0186] In this embodiment, by forming a first mating plane on the side of the second heat exchange plate facing away from the first heat exchange plate, and the first mating plane is used to cooperate with the first battery cell assembly, in this way, the heat exchange member 31 can better cooperate with the first battery cell assembly.

[0187] In a relatively cold environment, it may cause the temperature of the battery device 100 to be relatively low, which will also affect the performance of the battery device 100. In the related art, by setting a heating device to heat the heat exchange medium, thereby heating the battery cell 11, this method has the problems of complex structure and high cost.

[0188] Exemplarily, the heating element 34 can be a heating film. Further, the heating element 34 can be an electric heating film.

[0189] Exemplarily, the interior of the heating element 34 has a heating resistance. After the heating resistance is energized, heat is generated to heat the battery cell assembly 10.

[0190] 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 exchanger 31. The material of the heat exchanger 31 itself can transfer the heat generated by the heating element 34 to the second battery cell assembly well. In this way, the heating element 34 can heat two adjacent battery cell assemblies 10 (such as the first battery cell assembly and the second battery cell assembly) simultaneously, improving the heating efficiency.

[0191] When the battery cell assembly 10 needs to be cooled, the cold 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.

[0192] A heating element 34 is arranged between the first mating plane and the first battery cell assembly. That is to say, the heating element 34 is arranged between the first mating plane and the first battery cell assembly. In other words, the first mating plane contacts the first battery cell assembly through the heating element 34.

[0193] Exemplarily, 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 are further mated with the first battery cell assembly, for example, fixed by gluing. Of course, it can also be that the heating element 34 is first attached to the first battery cell assembly, and then the heat exchanger 31, the heating element 34 and the first battery cell assembly are fixed by gluing.

[0194] In this embodiment, by arranging the heating element 34 between the first mating plane and the first battery cell assembly, heating of the first battery cell assembly and the second battery cell assembly can be achieved simultaneously. This structure is simple, has a low cost, and is beneficial to improving the heating efficiency. In addition, by forming a first mating plane on the side of the second heat exchange plate facing away from the first heat exchange plate, it is convenient to arrange the heating element 34 so that the heating element 34 can better fit with the heat exchanger 31.

[0195] In some embodiments, please refer to Figures 3 to 4 , the battery device 100 further includes a partition member 40. The partition member 40 is arranged in other areas of the first heat exchange plate except for the convex portion, and the partition member 40 abuts between the first heat exchange plate and the second battery cell assembly.

[0196] Exemplarily, the partition member 40 abuts between the first heat exchange plate of the heat exchange member 31 and the second battery cell assembly.

[0197] Exemplarily, the first heat exchange plate and the second battery cell assembly can be adhesively bonded by applying glue. The provision of the partition member 40 can block the glue, thereby improving the situation where the glue overflows.

[0198] The partition member 40 abuts between the first heat exchange plate and the second battery cell assembly. That is to say, the second battery cell assembly presses on the partition member 40 instead of on the heat exchange member 31. The partition member 40 can play a supporting role. In this way, to a certain extent, the situation where the second battery cell assembly crushes the medium flow channel 311 (the raised portion) can be avoided.

[0199] Exemplarily, the partition member 40 can be higher than the raised portion, and the medium flow channel 311 is formed in the raised portion, so that the upper battery cell assembly 10 presses on the partition member 40 instead of on the raised portion.

[0200] In this embodiment, by providing the partition member 40 and abutting the partition member 40 between the first heat exchange plate and the second battery cell assembly, the partition member 40 can play a supporting role, thereby improving the situation where the second battery cell assembly presses on the medium flow channel 311, and further reducing the possibility that the second battery cell assembly crushes the medium flow channel 311, which is beneficial to improving the reliability of the battery device 100. In addition, the provision of the partition member 40 can also block the glue, thereby improving the situation where the glue overflows to the outside of the battery cell assembly 10.

[0201] The partition member 40 can be provided on one side of the raised portion along the second direction, or the partition member 40 can be provided on both sides of the raised portion along the second direction.

[0202] Of course, the partition member 40 can also be provided at the middle position of the raised portion. For example, the partition member 40 is provided at the gap between adjacent medium flow channels 311.

[0203] Exemplarily, the partition member 40 extends along the first direction.

[0204] In this embodiment, the partition member 40 is provided on at least one side of the raised portion along the second direction, which is beneficial to blocking the glue, thereby further improving the situation where the glue overflows.

[0205] In some embodiments, a thermal conductive adhesive is filled between the electrode terminal 111 and the heat exchange member 31.

[0206] Exemplarily, the thermal resistance of the thermal conductive adhesive is less than the thermal resistance of air.

[0207] Since a thermal conductive adhesive is filled between the electrode terminal 111 and the heat exchange member 31, heat can be conducted between the electrode terminal 111 and the heat exchange member 31 through the thermal conductive adhesive.

[0208] In this way, it is beneficial to reduce the thermal resistance between the electrode terminal 111 and the heat exchange member 31, improve the heat conduction efficiency between the electrode terminal 111 and the heat exchange member 31, and thus improve the heat exchange efficiency of the electrode terminal 111.

[0209] In some embodiments, please refer to Figure 7 , in the second direction, the minimum distance h4 between the dielectric flow channel 311 and the electrode terminal 111 is in the range of 0 to 5 mm.

[0210] The minimum distance between the dielectric flow channel 311 and the electrode terminal 111 can be a point value of 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 a point value between any two of them.

[0211] Here, h4 can be measured by measuring tools such as vernier calipers at room temperature before the battery device 100 is used.

[0212] In the second direction, since the minimum distance h4 between the dielectric flow channel 311 and the electrode terminal 111 is set to be in the range of 0 to 5 mm, the distance between the dielectric flow channel 311 and the electrode terminal 111 can be shortened as much as possible, thereby improving the heat exchange efficiency of the heat exchange member 31 for the electrode terminal 111.

[0213] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the present application.

Claims

1. A battery device, characterized in that, include: Battery box; 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; A heat exchange assembly, the heat exchange assembly comprising 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 with the first medium communication port and the second medium communication port, the heat exchange element being provided on at least one side of the battery monomer assembly along a third direction, the first direction, the second direction and the third direction intersecting each other; Wherein, the medium flow path includes 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 connected in sequence, and along the flow direction from the first medium connecting port to the second medium connecting 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.

2. The battery device according to claim 1, wherein At least part of the medium flow channel includes a plurality of sub-flow channels connected in parallel, the plurality of sub-flow channels are arranged at intervals along the second direction, and each of the sub-flow channels extends along the first direction.

3. The battery device according to claim 1, characterized in that: The electrode terminal includes a first electrode terminal and a second electrode terminal, The first electrode terminal is disposed at a first end of the housing along the second direction, and the second electrode terminal is disposed at a second end of the housing along the second direction. Along the flow direction from the first medium communication port to the second medium communication 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, Along the flow direction from the second medium communication port to the first medium communication port, the medium flow channel 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.

4. The battery device according to claim 3, characterized in that: The medium flow channel includes a first medium flow channel and a second medium flow channel, In the second direction, the first medium flow channel is closest to the first electrode terminal compared to the other medium flow channels, and the second medium flow channel is closest to the second electrode terminal compared to the other medium flow channels. The medium flow path further includes a connecting flow channel extending along the second direction, and an end of the first medium flow channel away from the first medium communication port is directly connected with an end of the second medium flow channel away from the second medium communication port through the connecting flow channel.

5. The battery device according to claim 4, characterized in that: The first medium communication port and the second medium communication port are located on the same side of the heat exchange element along the first direction. The first medium communication port and the connecting flow channel are located on different sides of the heat exchange element along the first direction.

6. The battery device according to claim 4, characterized in that: The heat exchanger includes 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 no medium flow channel is arranged in the second region. 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.

7. The battery device according to claim 6, wherein 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.

8. The battery device according to claim 1, wherein The electrode terminals include a first electrode terminal and a second electrode terminal. The first electrode terminal is arranged at the first end of the housing along the second direction, and the second electrode terminal is arranged at the second end of the housing along the second direction. The heat exchanger includes a first heat exchanger and a second heat exchanger. The first heat exchanger and the second heat exchanger are arranged at intervals along the second direction and are arranged on the same side of the battery cell assembly along the third direction. In the second direction, 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.

9. The battery device according to claim 8, wherein Along the flow direction from the first medium communication port of the first heat exchanger to the second medium communication port of the first heat exchanger, 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. Along the flow direction from the first medium communication port of the second heat exchanger to the second medium communication 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.

10. The battery device according to any one of claims 1 to 9, wherein When projected onto the same projection plane along the third direction, the projection of the medium flow channel in the second direction is within the projection range of the battery cell in the second direction.

11. The battery device according to any one of claims 1 to 9, wherein The size of the housing along the first direction and the size of the housing along the third direction are smaller than the size of the battery cell along the second direction. The size of the housing along the second direction is in the range of 300 mm to 1200 mm.

12. The battery device according to any one of claims 1 to 9, wherein The heat exchange member includes a first heat exchange plate and a second heat exchange plate. A partial area 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 channel is defined between the protruding portion and the second heat exchange plate.

13. The battery device according to claim 12, characterized in that, The first heat exchange plate and the second heat exchange plate are connected by welding.

14. The battery device according to claim 12, 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 disposed between the first battery cell assembly and the second battery cell assembly. A first mating plane is formed on a side of the second heat exchange plate facing away from the first heat exchange plate. The first mating plane faces the first battery cell assembly, and the protruding portion faces the second battery cell assembly. The heat exchange assembly further includes a heating element, and the heating element is disposed between the first mating plane and the first battery cell assembly.

15. The battery device according to claim 14, wherein The battery device further includes a partition member. The partition member is disposed in other areas of the first heat exchange plate except the protruding portion, and the partition member abuts between the first heat exchange plate and the second battery cell assembly.

16. The battery device according to any one of claims 1 to 9, characterized in that, A heat-conducting adhesive is filled between the electrode terminal and the heat exchange member.

17. The battery device according to any one of claims 1 to 9, characterized in that, In the second direction, the minimum distance between the medium flow channel and the electrode terminal is in the range of 0 to 5 mm.

18. An electrical device, characterized in that, The electrical device includes the battery device according to any one of claims 1 to 17.

19. An energy storage device, characterized in that, The energy storage device includes the battery device according to any one of claims 1 to 17.

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