Battery device and electric appliance

Abstract

The application discloses a battery device and an electric device. The battery device comprises a battery cell assembly and a heat exchange element. The battery cell assembly comprises a plurality of battery cells, and each battery cell has a pole. The heat exchange element is provided with a heat exchange cavity, a liquid inlet and a liquid outlet. The liquid inlet and the liquid outlet are respectively communicated with the heat exchange cavity. In addition, the heat exchange element is further provided with a mounting port. The mounting port is communicated with the heat exchange cavity and is arranged in a spaced manner with the liquid inlet and the liquid outlet. One end of the pole of the battery cell is arranged in the mounting port, and the pole is arranged in the heat exchange cavity. The technical scheme can reduce the temperature rising rate of the battery cell during charging, so as to improve the charging efficiency of the battery cell.

Description

Technical Field

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

[0002] When a battery device is charged at a higher rate, it generates significant heat, causing the temperature of the individual battery cells to rise rapidly. However, when the temperature of a single battery cell becomes too high, the battery management system of the device will trigger a protection mechanism to prematurely limit the charging rate, thus affecting charging efficiency. Utility Model Content

[0003] The main objective of this application is to provide a battery device and electrical equipment designed to reduce the rate of temperature rise of individual battery cells during charging, thereby improving the charging efficiency of individual battery cells.

[0004] To achieve the above objectives, the battery device proposed in this application includes: A battery cell assembly comprises multiple battery cells, each battery cell having terminals; and The heat exchanger is provided with a heat exchange chamber, a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are respectively connected to the heat exchange chamber; The heat exchanger is also provided with an installation port, which is connected to the heat exchange chamber and is spaced apart from the liquid inlet and liquid outlet. The battery cell has one end with a terminal inserted into the mounting port, and the terminal is housed in the heat exchange chamber.

[0005] The battery device in this application has one end of the battery cell with the terminal protruding through the mounting port, allowing the terminal to be housed within the heat exchange chamber of a heat exchange component. The inlet and outlet of the heat exchange component can be connected to an external heat exchange circulation mechanism to form a circulation path, allowing the heat exchange medium to enter the heat exchange chamber through the inlet, exchange heat with the terminal, and then flow out through the outlet. In this case, the terminal is directly immersed in the heat exchange medium flowing through the heat exchange chamber, shortening the heat exchange path and improving heat exchange efficiency. This allows for targeted cooling of the main heat-generating area of ​​the battery cell, namely the terminal region, thereby reducing the rate of temperature rise during charging and enabling charging within a suitable temperature range to maintain a high charging rate and improve the charging efficiency of the battery cell. Furthermore, because only a portion of the battery cell, i.e., the end with the terminal, is housed within the heat exchange chamber for cooling, the volume of the heat exchange component can be relatively small, reducing space occupation and increasing the energy density of the battery device. At the same time, it can also reduce the demand for heat exchange medium, thereby making it easier to control and seal, and improving the convenience of battery device processing and manufacturing.

[0006] In some embodiments, a partition is provided in the heat exchange cavity to divide the heat exchange cavity into multiple sub-channels. The multiple sub-channels are connected in series and / or in parallel to form at least one heat exchange channel. The two ends of the heat exchange channel are respectively connected to the liquid inlet and the liquid outlet. The mounting port is connected to the sub-channel, and at least part of the sub-channel contains a pole.

[0007] Therefore, the sub-channels can guide the heat exchange medium entering the heat exchange cavity to flow accurately through the areas requiring heat exchange and cooling, improving the targeted heat dissipation of the electrode areas of individual battery cells. Simultaneously, it can reduce the formation of flow stagnation areas within the heat exchange cavity, thus improving the overall fluidity of the heat exchange medium.

[0008] In some embodiments, a plurality of battery cells are arranged along a first direction to form a battery pack, and the battery cell assembly includes a plurality of battery packs arranged side by side along a second direction, the second direction intersecting the first direction; Each sub-channel extends along a first direction, and multiple sub-channels are arranged along a second direction. At least some of the sub-channels are formed as first sub-channels, and the terminals in each battery pack are housed within a first sub-channel.

[0009] Therefore, the terminal regions of each battery cell in the battery pack can be cooled by heat exchange through the heat exchange medium flowing through the corresponding first sub-channel, which can further improve the accuracy of the heat exchange medium flowing through the terminal regions of each battery cell in the battery pack, so as to further improve the targeted heat dissipation of the terminal regions of the battery cells and the fluidity of the heat exchange medium.

[0010] In some embodiments, the separator includes a plurality of partition segments, each partition segment extending along a first direction, the plurality of partition segments being arranged side by side at intervals along a second direction, and at least some sub-channels being respectively disposed between each two adjacent partition segments.

[0011] This simplifies the structural design of the separator and reduces its space occupation in the heat exchange chamber, thereby improving the convenience of manufacturing and the heat exchange and cooling effect.

[0012] In some embodiments, the battery cell has a first end face, the first end face is provided with an electrode post, the heat exchange cavity has a first cavity wall opposite to the first end face, and a partition section is provided between the first end face and the first cavity wall.

[0013] Therefore, a sub-channel can be formed close to the first end face, which can improve the targeting of heat dissipation in the pole area, reduce the cross-sectional height of the sub-channel, improve the compactness of the structure, reduce the amount of heat exchange medium required for easy control, and improve the fluidity of the heat exchange medium.

[0014] In some embodiments, in the second direction, the battery cell has at least one partition segment on both sides of the electrode post; The multiple sub-channels include a first sub-channel and a second sub-channel, and the heat exchange cavity has a second cavity wall that is relatively spaced apart in the second direction; A first sub-flow channel is provided between some adjacent partition sections, and a second sub-flow channel is provided between other adjacent partition sections and / or between at least one second cavity wall and an adjacent partition section.

[0015] This allows for an increase in the number of sub-channels, which in turn increases the heat exchange area with the first end face, further improving the heat exchange and cooling effect on the battery cell at one end of the electrode.

[0016] In some embodiments, the heat exchange cavity has a third cavity wall and a fourth cavity wall that are spaced apart from each other in a first direction, and at least a portion of the partition is formed as a first partition, which is spaced apart from the third cavity wall and the fourth cavity wall, respectively.

[0017] This facilitates passage through the gaps between the first partition sections, enabling connectivity between adjacent sub-channels.

[0018] In some embodiments, between every two adjacent first sub-channels, a partition segment is formed as a second partition segment, and a partition segment other than the first partition segment among a plurality of partition segments is formed as a first partition segment; In each pair of adjacent second partitions, one second partition is in contact with the third cavity wall and spaced apart from the fourth cavity wall, and the other second partition is in contact with the fourth cavity wall and spaced apart from the third cavity wall; In the second direction, the inlet is connected to at least one sub-channel at one end, and the outlet is connected to at least one sub-channel at the other end.

[0019] Therefore, the several first sub-channels arranged side by side can be connected in series, which can guide the heat exchange medium to flow through all the battery cells, so that each battery cell can be cooled, thus improving the reliability of the overall cooling and heat exchange of the battery device.

[0020] In some embodiments, on a projection plane perpendicular to a third direction, the dividing segment extends linearly along a first direction, or at least a portion of the dividing segment extends curvedly along the first direction, wherein the first direction, the second direction, and the third direction intersect each other.

[0021] Therefore, designing the separator as a linear extension simplifies its shape and improves its manufacturing convenience. Designing at least a portion of the separator as a curved extension allows for bending to form multiple "groove" structures. These "groove" structures enhance the turbulence effect on the heat exchange medium; simultaneously, they extend the heat exchange time between the heat exchange medium and the end of the battery cell with the electrode post, and increase the heat exchange area by accommodating more heat exchange medium, thereby improving the heat exchange and cooling effect on the battery cell.

[0022] In some embodiments, a battery cell includes a battery body and a terminal post disposed on the battery body, the battery body passing through a mounting port, and a sealant filling the space between the battery body and the inner wall of the mounting port.

[0023] Therefore, this sealant can effectively seal the space between the battery cell and the inner wall of the mounting port, improving the sealing effect of the heat exchange chamber.

[0024] In some embodiments, the mounting port is located on the upper surface of the heat exchanger.

[0025] This allows the heat exchanger to be located at the lower end of the battery cell, thus ensuring that the heat exchange medium remains stably positioned within the heat exchange chamber under the influence of gravity, reducing the possibility of leakage from the mounting port.

[0026] In some embodiments, the heat exchanger includes a first part and a second part, wherein the second part covers the first part and surrounds the first part to form a heat exchange cavity; The inlet and outlet are located in the first part, and the mounting port is located in the second part.

[0027] Therefore, the structures of the first and second parts are relatively simple, which helps to improve the convenience of processing and manufacturing heat exchange components.

[0028] In some embodiments, the second part is made of insulating material; Therefore, even if the insulating film wears down when the battery cell is installed through the mounting port, the possibility of short circuit can be reduced, which helps to improve the insulation protection effect.

[0029] In some embodiments, the second part is welded to the first part.

[0030] Therefore, welding the second part to the first part can improve the reliability of the connection between the two and provide a better sealing effect at the connection.

[0031] In some embodiments, the battery device further includes a battery case having a receiving cavity, in which battery cell assemblies and heat exchangers are disposed.

[0032] Therefore, the heat exchanger can be installed in a separate battery box, which also provides protection for it.

[0033] In some embodiments, the battery device further includes a battery case having multiple case walls that enclose a receiving cavity; a battery cell assembly is disposed within the receiving cavity, and a heat exchange element is formed as a case wall.

[0034] This reduces the number of components in the battery device and lowers manufacturing costs.

[0035] In some embodiments, the battery device further includes a busbar connected to the terminals of two adjacent battery cells, and the busbar is housed within a heat exchange chamber.

[0036] This improves the heat exchange and cooling effect of the manifold.

[0037] In some embodiments, a pressure relief valve is provided on the side of the battery cell facing away from the terminal post.

[0038] Therefore, when a battery cell experiences thermal runaway and is depressurized through the pressure relief valve, it will not be blocked by the heat exchange components, thus improving the reliability of the pressure relief valve.

[0039] In some embodiments, the inlet and outlet are configured to communicate with an external heat exchange circulation mechanism to form a circulation path for the heat exchange medium. The external heat exchange circulation mechanism includes a connecting pipe and a power pump and a heat exchanger disposed on the connecting pipe.

[0040] This allows for continuous heat exchange and cooling of the end of the battery cell with the terminal post, thereby improving the cooling effect.

[0041] In some embodiments, the heat exchange chamber contains an insulating heat exchange medium.

[0042] This reduces the possibility of short circuits and improves insulation protection.

[0043] On the other hand, the electrical equipment proposed in this application includes the battery device in any of the above embodiments. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of one embodiment of the vehicle of this application; Figure 2This is a schematic diagram of the structure of an embodiment of the battery device of this application; Figure 3 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application; Figure 4 This is a schematic diagram of the assembly structure of a battery cell assembly and a heat exchanger according to an embodiment of the battery device of this application; Figure 5 for Figure 4 An exploded structural diagram of a single battery cell assembly and heat exchanger. Figure 6 for Figure 5 Schematic diagram of the heat exchanger structure; Figure 7 for Figure 6 A schematic diagram of the exploded structure of a heat exchanger; Figure 8 This is a partial cross-sectional schematic diagram of an embodiment of the battery device of this application; Figure 9 for Figure 7 A partial structural diagram of the heat exchanger; Figure 10 This is a schematic diagram of another partial structure of the heat exchanger in this application.

[0046] Explanation of icon numbers: 100. Battery assembly; 1. Battery box; 1a. Receptacle; 11. Box cover; 12. Box body; 20A. Battery cell assembly; 20. Battery cell; 20C. Battery body; 21. End cap; 22. Housing; 23. Electrode assembly; 231. Tab; 211. First end face; 21a. Terminal post; 20B. Battery pack; 30. Heat exchanger; 31. Heat exchange chamber; 312. First chamber wall; 313. Second chamber wall; 314. Third chamber wall; 315. Fourth chamber 32. Wall; 321. Sub-channel; 323. First sub-channel; 324. Second sub-channel; 33. First section; 331. Inlet; 332. Outlet; 34. Second section; 341. Mounting port; 35. Connecting port; 40. Separator; 41. Separator segment; 411. First separator segment; 413. Second separator segment; 50. Manifold; 200. Controller; 300. Motor; 1000. Vehicle; X. First direction; Y. Second direction; Z. Third direction.

[0047] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0049] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0050] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0052] A battery device, or energy storage device, is widely used not only in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in other fields. A battery device can include a battery box and individual battery cells housed within the battery box. The battery box can include a box body and a cover that closes to the box body to enclose a cavity containing the individual battery cells. The individual battery cell is the smallest unit that makes up a battery, typically including a casing and an electrode assembly housed within the casing. The electrode assembly is the component in the individual battery cell where the electrochemical reaction actually occurs, and can include a positive electrode, a negative electrode, and a separator located between them, formed by winding or stacking the positive electrode, negative electrode, and separator. Furthermore, at least two individual battery cells within the battery box can be connected in series, in parallel, or in a hybrid connection including both series and parallel connections.

[0053] Furthermore, when the battery device is charged at a higher rate, the high current at the battery cell terminals and the insufficient current-carrying capacity of the busbars cause significant heat generation in the battery cell terminal area, leading to a rapid temperature rise in the battery cell. However, when the battery cell temperature becomes too high, the battery management system of the battery device will trigger a protection mechanism to prematurely limit the charging rate, thus affecting charging efficiency.

[0054] Therefore, based on the above considerations, in order to solve the problem of excessively high battery cell temperature affecting charging efficiency, this application proposes a novel battery device. This battery device innovatively places one end of the battery cell with the terminal post through the mounting port of a heat exchanger, allowing at least one terminal post of the battery cell to be housed within the heat exchange chamber of the heat exchanger. This enables direct heat exchange between the terminal post and the heat exchange medium flowing through the heat exchange chamber, thereby improving heat exchange efficiency, reducing the temperature of the battery cell, and allowing the battery cell to maintain a high charging rate within a suitable temperature range.

[0055] Furthermore, it should be noted that the battery device proposed in this application can be applied to electrical devices. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Further, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0056] Furthermore, it should be noted that the battery device proposed in this application can be applied to electrical devices to provide power to them. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, rail trains, ships, and spacecraft. Further, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., while spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0057] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0058] Please refer to Figure 1 In one embodiment of this application, the vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0059] In one embodiment of this application, the battery device 100 can also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000, and can also be used to supply power to electrical appliances on the vehicle 1000.

[0060] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a battery case 1 and a battery cell assembly 20A; the battery case 1 is provided with a receiving cavity 1a, and the battery cell assembly 20A is disposed inside the battery case 1.

[0061] The battery box 1 can be used to form a receiving cavity 1a to provide a space for housing the battery cell assembly 20A. The battery box 1 can adopt various structures. In some embodiments, the battery box 1 can include a cover 11 and a body 12 that overlap each other to jointly define the receiving cavity 1a for housing the battery cell assembly 20A. In this case, the body 12 can provide housing support for the battery cell 20A. Alternatively, both the cover 11 and the body 12 can be hollow structures with an opening on one side. In this case, the opening side of the cover 11 can cover the opening side of the body 12. Of course, the cover 11 can also be a plate-like structure and cover the opening side of the body 12. In addition, the battery box 1 formed by the cover 11 and the body 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0062] The battery cell assembly 20A may include multiple battery cells 20. A battery cell 20 is the smallest unit constituting the battery device 100. Multiple battery cells 20 may be connected in series, parallel, or a combination thereof; a combination thereof means that multiple battery cells 20 are connected in both series and parallel. Furthermore, multiple battery cells 20 may be arranged along their thickness direction to form a battery pack 20B. The battery device 100 may include only one battery pack 20B, or it may include at least two battery packs 20B arranged side-by-side.

[0063] In addition, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0064] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery cell 20 may include a battery body 20C and a terminal post 21a. The battery body 20C includes an end cap 21, a housing 22 and an electrode assembly 23. The terminal post 21a may be disposed on the end cap 21.

[0065] End cap 21 refers to a component that covers the opening of the outer casing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of the outer casing 22 to fit it. Optionally, end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure or impact, giving the battery cell 20 higher structural strength and improving reliability. Terminal post 21a can be used for electrical connection with electrode assembly 23 to output or input electrical energy to the battery cell 20. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating structure can also be provided on the inner side of end cap 21. The insulating structure can be used to isolate the electrical components inside the outer casing 22 from end cap 21 to reduce the risk of short circuits. For example, the insulating structure can be plastic, rubber, etc.

[0066] The outer casing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The outer casing 22 and the end cap 21 can be independent components. An opening can be provided on the outer casing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the outer casing 22 can be integrated. Specifically, the end cap 21 and the outer casing 22 can form a common connecting surface before other components are inserted into the casing. When it is necessary to encapsulate the interior of the outer casing 22, the end cap 21 closes the outer casing 22. The outer casing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the outer casing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the outer casing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0067] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 231. The positive and negative tabs may be located together at one end of the electrode body or separately at both ends of the electrode body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs 231 connect to the terminals 21a to form a current loop.

[0068] Please refer to the reference. Figures 4 to 8In one embodiment of this application, the battery device 100 further includes a heat exchanger 30, which is provided with a heat exchange chamber 31, an inlet 331 and an outlet 332, with the inlet 331 and the outlet 332 respectively connected to the heat exchange chamber 31; the heat exchanger 30 is also provided with an installation port 341, which is connected to the heat exchange chamber 31 and spaced apart from the inlet 331 and the outlet 332; one end of the battery cell 20 with an electrode post 21a passes through the installation port 341, and the electrode post 21a is housed in the heat exchange chamber 31.

[0069] The heat exchanger 30, through its inlet 331 and outlet 332, can be connected to an external heat exchange circulation mechanism to form a circulation path for the heat exchange medium. This external heat exchange circulation mechanism includes a connecting pipe and a power pump and heat exchanger disposed within the connecting pipe. The connecting pipe can be connected to the inlet 331 and outlet 332. In this case, the heat exchange medium can enter the heat exchange chamber 31 through the inlet 331, exchange heat with the electrode column 21a housed within the heat exchange chamber 31, and remove heat from the battery cell 20. After being cooled by the external heat exchange circulation mechanism, it can then re-enter the heat exchange chamber 31 through the inlet 331, thereby achieving continuous heat exchange and cooling of the battery cell 20. It should be noted that in some embodiments, when the ambient temperature is relatively low, the battery cell 20 can also be heated through heat exchange using the heat exchange medium.

[0070] Furthermore, since the heat exchange medium is in contact with the electrode post 21a for heat exchange, the heat exchange medium can be an insulating liquid, such as silicone oil or fluorinated liquid, to improve the insulation protection effect of the battery device 100 while achieving heat exchange for the battery cell 20. Of course, in some embodiments, the heat exchange medium can also be a conductive liquid, such as water or sodium chloride, in which case an insulating layer can be provided on the outer side of both the electrode post 21a and the busbar 50 connected to the electrode post 21a. The busbar 50 is configured to electrically connect two adjacent battery cells 20 to achieve series and / or parallel connection between the battery cells 20. Moreover, to facilitate connection and improve structural compactness, the busbar 50 can be arranged inside the heat exchange cavity 31 along with the electrode post 21a.

[0071] Furthermore, the heat exchanger 30 can be positioned on the side facing the terminal 21a of the battery cell 20, so that one end of the battery cell 20 with the terminal 21a can pass through the mounting port 341 of the heat exchanger 30, allowing the terminal 21a to extend into the heat exchange chamber 31. This can include situations where the terminal 21a of the battery cell 20 passes through the mounting port 341, with a portion of the terminal 21a extending into the heat exchange chamber 31; or where the end of the battery body 20C of the battery cell 20 near the terminal 21a passes through the mounting port 341. Moreover, when the battery body 20C passes through the mounting port 341, a portion of the battery body 20C can extend into the heat exchange chamber 31, ensuring that both the terminal 21a and portions of the battery body 20C are housed within the heat exchange chamber 31. Alternatively, the battery body 20C may not extend into the heat exchange chamber 31.

[0072] Furthermore, when the battery device 100 is in normal installation and use, with the ground as a reference, the mounting port 341 can be located on the upper surface of the heat exchanger 30, so that the battery cell 20 is positioned above the heat exchanger 30. Alternatively, the mounting port 341 can be located on the lower surface of the heat exchanger 30, so that the battery cell 20 is positioned below the heat exchanger 30. Or, the mounting port 341 can be located on the side surface of the heat exchanger 30, so that the battery cell 20 is positioned on one side of the heat exchanger 30 in the horizontal direction. Moreover, the number of mounting ports 341 can be multiple, with each mounting port 341 corresponding to one battery cell 20. Alternatively, each mounting port 341 can correspond to at least two battery cells 20.

[0073] Furthermore, the number of heat exchangers 30 can be one, to accommodate the terminals 21a of all the battery cells 20 in the battery cell assembly 20A. Of course, the number of heat exchangers 30 can also be two or more, so that the terminals 21a in the battery cell assembly 20A can be accommodated in different heat exchangers 30.

[0074] Alternatively, the heat exchanger 30 can be installed independently of the battery box 1. In this case, the heat exchanger 30 can be placed within the accommodating cavity 1a to provide protection through the battery box 1. Alternatively, the battery box 1 can have multiple walls that enclose the accommodating cavity 1a, with the heat exchanger 30 formed as one of these walls. Part of these walls can be connected to form the box body 12 described above, while another wall can be formed as the box cover 11 described above. The heat exchanger 30 can be formed as a wall opposite the box cover 11 to support the battery cell 20. Alternatively, the heat exchanger 30 can be formed as the box cover 11, allowing for integrated installation with a single wall. This reduces the number of components in the battery assembly 100 and lowers manufacturing costs.

[0075] In the battery device 100 of this application, one end of the battery cell 20 with the electrode post 21a is inserted through the mounting port 341, allowing the electrode post 21a to be accommodated within the heat exchange chamber 31 of the heat exchange component 30. The liquid inlet 331 and liquid outlet 332 on the heat exchange component 30 can be used to connect with an external heat exchange circulation mechanism to form a circulation path, allowing the heat exchange medium to enter the heat exchange chamber 31 through the liquid inlet 331, contact the electrode post 21a for heat exchange, and then flow out through the liquid outlet 332. At this point, the electrode post 21a is directly immersed in the heat exchange medium flowing through the heat exchange chamber 31, which shortens the heat exchange path and improves heat exchange efficiency. This allows for targeted cooling of the main heat-generating area of ​​the battery cell 20, namely the electrode post 21a region, thereby reducing the temperature rise rate of the battery cell 20 during charging. This allows it to be charged within a suitable temperature range while maintaining a high charging rate, thus improving the charging efficiency of the battery cell 20. Furthermore, since only a portion of the battery cell 20, specifically the end with the electrode post 21a, is housed within the heat exchange chamber 31 for cooling, the volume of the heat exchange component 30 can be made relatively small. This reduces space requirements and increases the energy density of the battery device 100. Simultaneously, the required amount of heat exchange medium is also relatively small, facilitating its control and sealing, and improving the ease of manufacturing the battery device 100.

[0076] Please refer to the reference. Figures 6 to 8 In one embodiment of this application, a partition 40 is provided in the heat exchange cavity 31, which divides the heat exchange cavity 31 into a plurality of sub-channels 32. The plurality of sub-channels 32 are connected in series and / or in parallel to form at least one heat exchange channel. The two ends of the heat exchange channel are respectively connected to the liquid inlet 331 and the liquid outlet 332. The mounting port 341 is connected to the sub-channel 32, and at least a portion of the sub-channel 32 contains an electrode post 21a.

[0077] The partition 40 can be used to divide the heat exchange cavity 31 into sub-channels 32 extending along a predetermined path, so as to guide the heat exchange medium entering the heat exchange cavity 31 through the area where heat exchange is required. The partition 40 can be, as described below, a plurality of parallel spaced partition sections 41, forming sub-channels 32 between adjacent partition sections 41. Alternatively, the partition 40 can be a U-shaped flow guide shroud; this application does not limit the structural type of the partition 40. Furthermore, the partition 40 can be provided independently of the heat exchange component 30, or it can be an integrally formed structure with the heat exchange component 30.

[0078] Multiple sub-channels 32 connected in series and / or in parallel to form at least one heat exchange channel means that the multiple sub-channels 32 can be connected in a single series, in a single parallel, or in a mixed connection including both series and parallel connections.

[0079] Forming at least one heat exchange channel means that multiple sub-channels 32 can be connected to form one heat exchange channel, and the two ends of this heat exchange channel are respectively connected to the inlet 331 and the outlet 332. Of course, multiple sub-channels 32 can be connected to form two or more heat exchange channels. For example, multiple sub-channels 32 located on one side of the heat exchange chamber 31 can be connected to form one heat exchange channel and connected to a set of inlets 331 and outlets 332; multiple sub-channels 32 on the other side can be connected to form another heat exchange channel and connected to another set of inlets 331 and outlets 332. Having poles 21a in at least some of the sub-channels 32 means that each sub-channel 32 can contain poles 21a, or only some of the sub-channels 32 can contain poles 21a.

[0080] In this embodiment, a sub-channel 32 is formed by providing a separator 40 within the heat exchange cavity 31, allowing the electrode post 21a to be positioned within the sub-channel 32. At this time, the heat exchange medium entering the heat exchange cavity 31 can be guided through the sub-channel 32 to accurately flow through the area requiring heat exchange and cooling, improving the targeted heat dissipation of the electrode post 21a area of ​​the battery cell 20. Simultaneously, it reduces the formation of flow stagnation areas in the heat exchange medium within the heat exchange cavity 31, which is beneficial for improving the overall fluidity of the heat exchange medium. This combination of guiding the heat exchange medium for targeted heat dissipation and improving its fluidity further enhances the heat exchange and cooling effect on the battery cell 20.

[0081] Please refer to the reference. Figures 4 to 8 In one embodiment of this application, a plurality of battery cells 20 are arranged along a first direction X to form a battery pack 20B. The battery cell assembly 20A includes a plurality of battery packs 20B arranged side by side along a second direction Y, the second direction Y intersecting the first direction X. Each sub-channel 32 extends along the first direction X, and the plurality of sub-channels 32 are arranged along the second direction Y. At least a portion of the sub-channels 32 are formed as a first sub-channel 321, and the terminal post 21a in each battery pack 20B is housed in a first sub-channel 321.

[0082] When the battery assembly 100 is in normal installation and use, the first direction X can be a horizontal direction. When the battery cell 20 is a prismatic battery, the first direction X can also be considered the thickness direction of the battery cell 20. The second direction Y can be another horizontal direction intersecting the first direction X.

[0083] In this embodiment, a battery pack 20B is correspondingly configured with a first sub-channel 321, so that the terminal post 21a region of the battery cell 20 in each battery pack 20B can be cooled by heat exchange through the heat exchange medium flowing through the corresponding first sub-channel 321. This further improves the accuracy of the heat exchange medium flowing through the terminal post 21a region of the battery cell 20 in each battery pack 20B, thereby improving the targeted heat dissipation of the terminal post 21a region of the battery cell 20 and the fluidity of the heat exchange medium. Moreover, the parallel arrangement of the sub-channels 32 is consistent with the parallel arrangement of the battery packs 20B, which also makes the arrangement of the sub-channels 32 regular, thus improving the convenience of manufacturing the heat exchange components 30.

[0084] Please refer to the reference. Figures 5 to 9 In one embodiment of this application, the separator 40 includes a plurality of separator segments 41, each separator segment 41 extending along a first direction X, the plurality of separator segments 41 being arranged side by side at intervals along a second direction Y, and at least some sub-channels 32 being respectively disposed between each two adjacent separator segments 41.

[0085] The partition section 41 can be plate-shaped or column-shaped; this application does not limit the structural type of the partition section 41. At least some sub-channels 32 are respectively disposed between each pair of adjacent partition sections 41, meaning that each sub-channel 32 can be formed by the space between two adjacent partition sections 41; of course, it is also possible that some sub-channels 32 are formed by the space between two adjacent partition sections 41, while other sub-channels 32 are formed by the partition section 41 and the opposing cavity walls in the heat exchange cavity 31.

[0086] In this embodiment, the separator 40 includes multiple separator segments 41, so that the space between two adjacent separator segments 41 can form a sub-channel 32. This simplifies the structural configuration of the separator 40 and reduces the space occupied by the separator 40 in the heat exchange cavity 31, thereby improving the convenience of processing and manufacturing and the heat exchange and cooling effect.

[0087] Please refer to reference 3 and... Figure 8 In one embodiment of this application, the battery cell 20 has a first end face 211, the first end face 211 is provided with an electrode post 21a, the heat exchange cavity 31 has a first cavity wall 312 opposite to the first end face 211, and the partition section 41 is provided between the first end face 211 and the first cavity wall 312.

[0088] The first end face 211 can be located on the end cap 21 of the battery cell 20.

[0089] In this embodiment, the separator 40 is disposed between the first end face 211 and the first cavity wall 312, so that it can be closely attached to the first end face 211 to form a sub-channel 32. This can improve the targeting of heat dissipation in the pole post 21a area, and reduce the cross-sectional height of the sub-channel 32, so as to improve the compactness of the structure, reduce the amount of heat exchange medium required for easy control, and improve the flowability of the heat exchange medium.

[0090] Please refer to the reference. Figure 8 and Figure 9 In one embodiment of this application, in the second direction Y, the battery cell 20 is provided with at least one partition section 41 on both sides of the electrode post 21a; the plurality of sub-channels 32 include a first sub-channel 321 and a second sub-channel 323, and the heat exchange cavity 31 has a second cavity wall 313 that is relatively spaced apart in the second direction Y; a first sub-channel 321 is provided between some adjacent partition sections 41, and a second sub-channel 323 is provided between other adjacent partition sections 41, and / or between at least one second cavity wall 313 and an adjacent partition section 41.

[0091] The battery cell 20 has at least one dividing section 41 on both sides of the terminal 21a, which means that it is on both sides of a combination of the positive terminal 21a and the negative terminal 21a of the battery cell 20.

[0092] In this embodiment, a second sub-channel 323 is provided on at least one side of the first sub-channel 321, which increases the number of sub-channels 32, thereby increasing the heat exchange area with the first end face 211 and further improving the heat exchange and cooling effect on the battery cell 20 at the electrode post 21a end. At this time, when the mounting port 341 is provided on the upper surface of the heat exchanger 30, the stability of the support for the battery cell 20 can also be improved by increasing the number of partition sections 41.

[0093] Please refer to the reference. Figures 7 to 9 In one embodiment of this application, the width of the second sub-channel 323 in the second direction Y is smaller than the width of the first sub-channel 321 in the first direction X, so that the positive electrode post 21a and the negative electrode post 21a of the battery cell 20 arranged in the second direction Y are placed in the first sub-channel 321.

[0094] Please refer to Figure 9 In one embodiment of this application, the heat exchange cavity 31 has a third cavity wall 314 and a fourth cavity wall 315 that are spaced apart in the first direction X, and at least a portion of the partition segment 41 is formed as a first partition segment 411, which is spaced apart from the third cavity wall 314 and the fourth cavity wall 315 respectively.

[0095] In this embodiment, the two ends of the first partition segment 411 in the first direction X are spaced apart from the third cavity wall 314 and the fourth cavity wall 315, respectively. This allows the sub-channels 32 located on both sides of the first partition segment 411 in the second direction Y to pass through the gaps between the first partition segments 411, thus achieving communication between adjacent sub-channels 32. In this case, there is no need to drill holes in the partition segment 41 to connect adjacent sub-channels 32, which simplifies the structural design of the heat exchange channel and improves the ease of manufacturing.

[0096] Please refer to Figure 9 In one embodiment of this application, between each pair of adjacent first sub-channels 321, a partition segment 41 is formed as a second partition segment 413, and among the plurality of partition segments 41, the partition segment 41 other than the first partition segment 411 is formed as a first partition segment 411; in each pair of adjacent second partition segments 413, one second partition segment 413 is disposed in contact with the third cavity wall 314 and is spaced apart from the fourth cavity wall 315, and the other second partition segment 413 is disposed in contact with the fourth cavity wall 315 and is spaced apart from the third cavity wall 314; in the second direction Y, the liquid inlet 331 is connected to at least one sub-channel 32 at one end, and the liquid outlet 332 is connected to at least one sub-channel 32 at the other end.

[0097] In this embodiment, the second dividing section 413 allows the several parallel first sub-channels 321 to be arranged in series, guiding the heat exchange medium through all battery cells 20 so that each battery cell 20 can be cooled, improving the reliability of the overall cooling and heat exchange of the battery device 100. Specifically, in the first direction X, the length of the first dividing section 411 is shorter than the length of the second dividing section 413, so that it can contact the third cavity wall 314 or the fourth cavity wall 315.

[0098] Please refer to Figure 10 In one embodiment of this application, on a projection plane perpendicular to the third direction Z, the dividing segment 41 extends linearly along the first direction X, and the first direction X, the second direction Y, and the third direction Z intersect each other.

[0099] When the first direction X and the second direction Y are horizontal as described above, the third direction Z can be vertical.

[0100] In this embodiment, the dividing segment 41 is set as a linear extension, which makes the shape of the dividing segment 41 simple, thereby improving the convenience of its processing and manufacturing.

[0101] Please refer to Figure 9 In one embodiment of this application, at least a portion of the dividing segment 41 is provided to extend in a curved manner along the first direction X on a projection plane perpendicular to the third direction Z.

[0102] In this embodiment, at least a portion of the partition segment 41 is configured as a curved extension, so that the partition segment 41 can be bent to form multiple "groove" structures. The "groove" structure can improve the turbulence effect on the heat exchange medium. At the same time, it can also extend the heat exchange time between the heat exchange medium and the end of the battery cell 20 with the electrode post 21a, and increase the heat exchange area by accommodating more heat exchange medium, thereby improving the heat exchange and cooling effect on the battery cell 20.

[0103] Please refer to Figure 4 , Figure 5 as well as Figure 8 In one embodiment of this application, the battery cell 20 includes a battery body 20C and an electrode post 21a disposed on the battery body 20C. The battery body 20C passes through the mounting port 341, and the space between the battery body 20C and the inner wall of the mounting port 341 is filled with sealant.

[0104] In this embodiment, sealant is injected between the battery body 20C and the inner wall of the mounting port 341, that is, between the outer shell 22 of the battery cell 20 and the inner wall of the mounting port 341, so that the sealant can better seal between the battery cell 20 and the inner wall of the mounting port 341, thereby improving the sealing effect of the heat exchange chamber 31.

[0105] Please refer to Figure 6 In one embodiment of this application, the mounting port 341 is provided on the upper surface of the heat exchanger 30.

[0106] In this embodiment, the mounting port 341 is located on the upper surface of the heat exchanger 30, so that the heat exchanger 30 is located at the lower end of the battery cell 20. This allows the heat exchange medium to be stably located in the heat exchange cavity 31 under the action of gravity, reducing the possibility of leakage from the mounting port 341.

[0107] Please refer to the reference. Figures 4 to 6 In one embodiment of this application, there are multiple mounting ports 341, and one end of each battery cell 20 with a terminal post 21a passes through a mounting port 341.

[0108] In this embodiment, each battery cell 20 is provided with a corresponding mounting port 341, which can reduce the possibility of heat exchange medium leakage between adjacent battery cells 20.

[0109] Please refer to the reference. Figure 6 and Figure 7 In one embodiment of this application, the heat exchanger 30 includes a first part 33 and a second part 34. The second part 34 covers the first part 33 and surrounds the first part 33 to form a heat exchange cavity 31. The liquid inlet 331 and the liquid outlet 332 are provided in the first part 33, and the mounting port 341 is provided in the second part 34.

[0110] The first part 33 can be a shell structure with one open end, while the second part 34 can be a plate structure that covers the opening of the first part 33, so that the structures of the first part 33 and the second part 34 are relatively simple. Of course, in other embodiments, the second part 34 can also be a shell structure with one open end.

[0111] In this embodiment, the heat exchanger 30 is divided into a first part 33 and a second part 34, so that the two can be manufactured independently and then assembled together. At this time, the structures of the first part 33 and the second part 34 are relatively simple, which helps to improve the convenience of processing and manufacturing the heat exchanger 30.

[0112] Please refer to the reference. Figures 5 to 7 In one embodiment of this application, each battery pack 20B has a busbar 50 with an output stage in the arrangement direction of the battery cells 20. The busbar 50 can pass through the first part 33 and the second part 34 to form a communication port 35 and extend to the outside of the heat exchanger 30 to realize electrical connection between adjacent battery packs 20B, or electrical connection between battery pack 20B and other devices in the battery device 100. At this time, in order to improve the sealing performance at the communication port 35, sealant can be filled between the busbar 50 of the output stage and the inner wall of the communication port 35.

[0113] In one embodiment of this application, the material of the second part 34 is an insulating material.

[0114] In this embodiment, the material of the second part 34 is an insulating material, such as plastic, so that when the battery cell 20 is installed in the mounting port 341, even if the insulating film is worn, the possibility of short circuit can be reduced, thereby improving the insulation protection effect.

[0115] Of course, this application is not limited to this. In other embodiments, the second part 34 may also be made of metal or other materials. In this case, in order to improve the insulation and protection effect, an insulating layer may be provided on the inner wall of the mounting port 341.

[0116] In one embodiment of this application, the first portion 33 may be made of metal to improve structural strength and thus extend service life. Of course, in other embodiments, the first portion 33 may also be made of plastic or other materials.

[0117] In one embodiment of this application, the second part 34 is welded to the first part 33.

[0118] In this embodiment, welding the second part 34 to the first part 33 improves the reliability of their connection and provides a better sealing effect at the joint. When the second part 34 is made of an insulating material, it can be directly welded to the first part 33. Alternatively, a metal ring can be placed around the periphery of the second part 34 for welding to the first part 33. Metal welding provides a stronger bond and improves the stability of the connection between the second part 34 and the first part 33, as well as the sealing performance between them.

[0119] In one embodiment of this application, a pressure relief valve is provided on the side of the battery cell 20 facing away from the terminal post 21a.

[0120] In this embodiment, the battery cell 20 may have an end cap 21 on one side in the Z direction for mounting a terminal post 21a; simultaneously, the battery cell 20 may also have another end cap 21 on the opposite side for mounting a pressure relief valve. Thus, when the battery cell 20 experiences thermal runaway and pressure is released through the pressure relief valve, it will not be obstructed by the heat exchange component 30, improving the reliability of the pressure relief valve's operation.

[0121] Please refer to the reference. Figures 4 to 9In one embodiment of this application, the battery device 100 includes a battery cell assembly 20A and a heat exchanger 30. The battery cell assembly 20A includes a plurality of battery cells 20, and each battery cell 20 has a terminal post 21a. The heat exchanger 30 is provided with a heat exchange chamber 31, an inlet 331, and an outlet 332, with the inlet 331 and the outlet 332 respectively connected to the heat exchange chamber 31. The heat exchanger 30 is also provided with an installation port 341, which is connected to the heat exchange chamber 31 and spaced apart from the inlet 331 and the outlet 332. One end of the battery cell 20 with the terminal post 21a passes through the installation port 341, and the terminal post 21a is housed within the heat exchange chamber 31. A partition 40 is provided inside the heat exchange chamber 31, which divides the heat exchange chamber 31 into multiple sub-channels 32. The multiple sub-channels 32 are connected in series and / or in parallel to form at least one heat exchange channel. The two ends of the heat exchange channel are respectively connected to the liquid inlet 331 and the liquid outlet 332. The mounting port 341 is connected to the sub-channel 32, and at least a portion of the sub-channel 32 contains an electrode post 21a. Multiple battery cells 20 are arranged along a first direction X to form a battery pack 20B. The battery cell assembly 20A includes multiple battery packs 20B arranged side by side along a second direction Y, which intersects with the first direction X. Each sub-channel 32 extends along the first direction X, and the multiple sub-channels 32 are arranged along the second direction Y. At least a portion of the sub-channels 32 form a first sub-channel 321, and the electrode post 21a in each battery pack 20B is housed in a first sub-channel 321. The separator 40 includes multiple separator segments 41, each separator segment 41 extending along a first direction X, and the multiple separator segments 41 arranged side by side at intervals along a second direction Y. At least some sub-channels 32 are respectively disposed between each two adjacent separator segments 41. The battery cell 20 has a first end face 211, the first end face 211 is provided with an electrode post 21a, the heat exchange cavity 31 has a first cavity wall 312 opposite to the first end face 211, and the separator segments 41 are disposed between the first end face 211 and the first cavity wall 312. In the second direction Y, each battery cell 20 has at least one partition section 41 on both sides of the electrode post 21a; the plurality of sub-channels 32 include a first sub-channel 321 and a second sub-channel 323; the heat exchange cavity 31 has relatively spaced second cavity walls 313 in the second direction Y; a first sub-channel 321 is provided between some adjacent partition sections 41, and a second sub-channel 323 is provided between other adjacent partition sections 41, and / or between at least one second cavity wall 313 and an adjacent partition section 41. The heat exchange cavity 31 has relatively spaced third cavity walls 314 and fourth cavity walls 315 in the first direction X; at least a portion of the partition sections 41 are formed as first partition sections 411, and the first partition sections 411 are spaced apart from the third cavity walls 314 and the fourth cavity walls 315, respectively.Between each pair of adjacent first sub-channels 321, a partition segment 41 is formed as a second partition segment 413, and the partition segments 41 other than the first partition segment 411 are formed as first partition segments 411. In each pair of adjacent second partition segments 413, one second partition segment 413 is in contact with the third cavity wall 314 and spaced apart from the fourth cavity wall 315, and the other second partition segment 413 is in contact with the fourth cavity wall 315 and spaced apart from the third cavity wall 314. In the second direction Y, the inlet 331 communicates with at least one sub-channel 32 at one end, and the outlet 332 communicates with at least one sub-channel 32 at the other end. On the projection plane perpendicular to the third direction Z, at least a portion of the partition segment 41 extends in a curved manner along the first direction X, and the first direction X, the second direction Y, and the third direction Z intersect each other.

[0122] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery device, characterized in that, include: A battery cell assembly, the battery cell assembly comprising a plurality of battery cells, the battery cells having terminals; and A heat exchanger is provided with a heat exchange chamber, a liquid inlet and a liquid outlet, wherein the liquid inlet and the liquid outlet are respectively connected to the heat exchange chamber; The heat exchanger is further provided with an installation port, which is connected to the heat exchange chamber and is spaced apart from the liquid inlet and the liquid outlet. The battery cell has one end of the electrode post passing through the mounting port, and the electrode post is housed in the heat exchange cavity.

2. The battery device as claimed in claim 1, characterized in that, The heat exchange chamber is provided with a partition, which divides the heat exchange chamber into multiple sub-channels. The multiple sub-channels are connected in series and / or in parallel to form at least one heat exchange channel. The two ends of the heat exchange channel are respectively connected to the liquid inlet and the liquid outlet. The mounting port is connected to the sub-channel, and the pole is placed in at least a portion of the sub-channel.

3. The battery device as claimed in claim 2, characterized in that, Multiple battery cells are arranged along a first direction to form a battery pack, and the battery cell assembly includes multiple battery packs arranged side by side along a second direction, the second direction intersecting the first direction; Each of the sub-channels extends along the first direction, and a plurality of the sub-channels are arranged along the second direction. At least a portion of the sub-channels are formed as a first sub-channel, and the terminal post in each battery pack is housed within a first sub-channel.

4. The battery device as claimed in claim 3, characterized in that, The separator includes multiple partition segments, each of which extends along the first direction, and the multiple partition segments are arranged side by side at intervals along the second direction, with at least a portion of the sub-channels respectively disposed between each two adjacent partition segments.

5. The battery device as claimed in claim 4, characterized in that, The battery cell has a first end face, the first end face is provided with the electrode post, the heat exchange cavity has a first cavity wall opposite to the first end face, and the partition section is disposed between the first end face and the first cavity wall.

6. The battery device as claimed in claim 5, characterized in that, In the second direction, each battery cell has at least one of the aforementioned partition sections on both sides of the electrode post; The plurality of sub-channels includes a first sub-channel and a second sub-channel, and the heat exchange cavity has relatively spaced second cavity walls in the second direction; A first sub-channel is provided between some adjacent partition segments, and a second sub-channel is provided between another portion of the adjacent partition segments, and / or between at least one second cavity wall and an adjacent partition segment.

7. The battery device as claimed in claim 4, characterized in that, The heat exchange cavity has a third cavity wall and a fourth cavity wall that are spaced apart from each other in the first direction, and at least a portion of the partition segment is formed as a first partition segment, which is spaced apart from the third cavity wall and the fourth cavity wall, respectively.

8. The battery device as claimed in claim 7, characterized in that, Between each pair of adjacent first sub-channels, one of the partition segments is formed as a second partition segment, and the partition segments other than the first partition segment are formed as the first partition segment; In each pair of adjacent second partitions, one second partition is disposed in contact with the third cavity wall and spaced apart from the fourth cavity wall, and the other second partition is disposed in contact with the fourth cavity wall and spaced apart from the third cavity wall; In the second direction, the inlet is connected to at least one of the sub-channels at one end, and the outlet is connected to at least one of the sub-channels at the other end.

9. The battery device as claimed in claim 4, characterized in that, On a projection plane perpendicular to the third direction, the dividing segment extends linearly along the first direction, or at least a portion of the dividing segment extends curvedly along the first direction, wherein the first direction, the second direction, and the third direction intersect each other.

10. The battery device according to any one of claims 1 to 9, characterized in that, The battery cell includes a battery body and a terminal post disposed on the battery body. The battery body passes through the mounting port, and the space between the battery body and the inner wall of the mounting port is filled with sealant. And / or, the mounting port is located on the upper surface of the heat exchanger.

11. The battery device according to any one of claims 1 to 9, characterized in that, The heat exchanger includes a first part and a second part, wherein the second part covers the first part and together with the first part forms the heat exchange cavity; The inlet and outlet are located in the first part, and the mounting port is located in the second part.

12. The battery device as claimed in claim 11, characterized in that, The material of the second part is insulating material; And / or, the second part is welded to the first part.

13. The battery device according to any one of claims 1 to 9, characterized in that, The battery device further includes a battery box, which has a receiving cavity, and the battery cell assembly and the heat exchanger are disposed within the receiving cavity; Alternatively, the battery device may further include a battery box having multiple boxes, the multiple boxes forming a receiving cavity; the battery cell assembly is disposed within the receiving cavity, and the heat exchange element is formed as one of the boxes.

14. The battery device according to any one of claims 1 to 9, characterized in that, The battery device further includes a busbar, which is connected to the terminals of two adjacent battery cells and is housed within the heat exchange chamber. And / or, a pressure relief valve is provided on the side of the battery cell facing away from the terminal post; And / or, the liquid inlet and the liquid outlet are configured to communicate with an external heat exchange circulation mechanism to form a circulation path for the heat exchange medium. The external heat exchange circulation mechanism includes a connecting pipe and a power pump and a heat exchanger disposed in the connecting pipe. And / or, the heat exchange cavity contains an insulating heat exchange medium.

15. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 14.

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