Battery device and electric appliance

Abstract

The application discloses a battery device and an electric device. The battery device comprises at least two heat exchange elements, a battery cell assembly and a communication element. The at least two heat exchange elements are arranged in a spaced manner, and the heat exchange elements are provided with heat exchange flow channels. The battery cell assembly comprises at least two battery cells, and at least one battery cell is arranged between two adjacent heat exchange elements. The battery cell has a first end surface and a side peripheral surface, the first end surface is provided with a pole, and the side peripheral surface is in heat exchange connection with the heat exchange element. The communication element is arranged on the side of the battery cell assembly with the pole and is configured to communicate the heat exchange flow channels in the at least two heat exchange elements. The normal direction of the first end surface is a first direction, and the battery cell arranged opposite to the communication element in the first direction is a positioning battery cell. In a projection plane perpendicular to the first direction, the projection of the communication element and the projection of the pole in the positioning battery cell do not overlap. In a projection plane parallel to the first direction, the projection of the pole in the positioning battery cell and the projection of the communication element at least partially overlap.

Description

Technical Field

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

[0002] With the gradual development of new energy vehicles, vehicle range has become an important performance indicator. As the primary energy source for new energy vehicles, the battery device is a key factor affecting vehicle range. Therefore, improving the energy density of battery devices is a pressing issue that needs to be addressed in battery technology. Summary of the Invention

[0003] The main objective of this application is to provide a battery device and an electrical appliance designed to improve the energy density of the battery device.

[0004] To achieve the above objectives, the battery device proposed in this application includes:

[0005] At least two heat exchangers are arranged at intervals, and the heat exchangers are provided with heat exchange channels.

[0006] A battery cell assembly includes at least two battery cells, with at least one battery cell positioned between two adjacent heat exchangers; each battery cell has a first end face and a side peripheral face connected together, the first end face having an electrode post, and the side peripheral face being heat-exchangeably connected to the heat exchanger; and

[0007] A connecting element is disposed on one side of the battery cell assembly having a terminal post and configured to connect heat exchange channels in at least two heat exchange elements.

[0008] The normal direction of the first end face is defined as the first direction, and the battery cell that is positioned opposite to the connecting member in the first direction is called the aligned battery cell; on a projection plane perpendicular to the first direction, the projection of the connecting member does not overlap with the projection of the electrode post in the aligned battery cell.

[0009] On a projection plane parallel to the first direction, the projection of the electrode post in the aligned battery cell at least partially overlaps with the projection of the connecting member.

[0010] The battery device in this application places a connecting member for connecting at least two heat exchange components on one side of the battery cell assembly with terminals. This ensures that the connecting member does not occupy the circumferential space of the battery cell assembly within the battery box, allowing for the stacking of more battery cells within the limited space of the battery box, thereby improving the energy density of the battery device. Furthermore, the projection of the connecting member and the projection of the terminals in the corresponding battery cells are set to not overlap, preventing further stacking of the connecting member with the terminals and busbars in the first direction, which would result in a high stacking height. This improves the compactness of the stacking arrangement of the connecting member and the battery cell assembly in the first direction, thus reducing the overall height of the battery device in the first direction. Moreover, on a projection plane parallel to the first direction, the projection of the terminals in the corresponding battery cells at least partially overlaps with the projection of the connecting member. The spatial gap formed by the stacked terminals and busbars allows for the installation of the connecting member within this spatial gap without increasing or excessively increasing the height of the battery device in the first direction, thereby improving the utilization of space within the battery box and reducing the overall volume of the battery device.

[0011] In some embodiments, the battery device further includes a busbar stacked along a first direction at the end of the terminal post away from the battery cell and configured to electrically connect two adjacent battery cells.

[0012] The distance between the side of the connecting member facing away from the first end face and the first end face is less than or equal to the distance between the side of the busbar facing away from the first end face and the first end face.

[0013] This improves the utilization rate of the space gap formed by the stacking of terminals and busbars, and better reduces the overall size of the battery device.

[0014] In some embodiments, the first end face is provided with two pole posts arranged at intervals, the two pole posts are constructed as pole post assemblies, and the connecting member is provided on at least one side of the pole post assembly in the battery cell.

[0015] This ensures that the connecting element does not occupy the space between the two terminals in the terminal assembly, making it easier to install other components of the battery device at that location.

[0016] In some embodiments, at least two heat exchangers are arranged along a second direction, and two poles in the pole assembly are arranged along a third direction, with the first direction, the second direction, and the third direction intersecting each other;

[0017] Along a third direction, the connecting element is located on at least one side of the terminal assembly in the opposing battery cell.

[0018] This allows the connecting element and the two terminals to be arranged along the length of the battery cell, making full use of the space on the first end face along the length of the battery cell and improving the convenience of arranging the connecting element and the two terminals. Simultaneously, it also allows the heat exchange element to be connected to the large surface of the battery cell for heat exchange, increasing the heat exchange area and thus improving the heat exchange efficiency of the battery cell.

[0019] In some embodiments, the length of the connecting element in the first direction is defined as D1, and the length in the third direction is defined as D2, satisfying the relationship: D1 < D2.

[0020] This allows the connecting element to be designed in a flat shape, minimizing its height in the first direction while fully utilizing the space on one side of the pole assembly in the third direction. This balances the convenience of installing and arranging the connecting element with increasing the amount of heat exchange medium transported by the connecting element to improve the heat exchange efficiency of the battery cells.

[0021] In some embodiments, the number of connecting elements is two, the two connecting elements are arranged side by side in a third direction, and are respectively configured to connect the heat exchange channels in at least two heat exchange elements.

[0022] This allows one of the two connecting parts to serve as an inlet pipe and the other as an outlet pipe, eliminating the need for an excessively large volume of a single connecting part and facilitating its installation within a limited space.

[0023] In some embodiments, along a third direction, one connecting member is provided on one side of all poles, and another connecting member is provided on the other side of all poles.

[0024] This allows the heat exchange medium to enter from one end of the heat exchanger in the third direction and then flow out from the other end in the third direction, making full use of the length of the heat exchanger in the third direction to arrange the heat exchange channels, extending the length of the heat exchange channels to increase the heat exchange area, and thus improving the heat exchange efficiency of the battery cells.

[0025] In some embodiments, the connecting member extends along a second direction and communicates with the heat exchange channels in all heat exchange members.

[0026] Therefore, by extending the connecting member along the second direction in a long strip shape, it is easy to connect with the heat exchange channels in all heat exchange components. This allows for liquid supply and / or discharge to all heat exchange components through the connecting member alone, thereby simplifying the number of components in the battery device. Simultaneously, the connecting member can also be made linear and have a regular extension shape, facilitating its installation and arrangement.

[0027] In some embodiments, the connecting element is made of an insulating material.

[0028] This reduces the possibility of electrical short circuits between the connector and the terminal, thereby improving the reliability of the battery device.

[0029] In some embodiments, the connecting element is made of a thermally conductive material.

[0030] Therefore, the connecting parts can also play a role in heat exchange for individual battery cells, thereby improving the heat exchange efficiency of individual battery cells.

[0031] In some embodiments, the connecting member is made of metal, and an insulating layer is provided on the outside of the connecting member;

[0032] And / or, a thermal interface material layer is provided between the connecting element and the battery cell.

[0033] Therefore, by making the connecting component a metal material, it can achieve better thermal conductivity, thereby improving the heat exchange efficiency between the connecting component and the battery cell. Furthermore, by adding an insulating layer to the outside of the connecting component, the possibility of electrical short circuits between it and the terminal post can be reduced, thus improving the reliability of the battery device. The addition of a thermal interface material layer can reduce the thermal resistance between the connecting component and the battery cell, further improving the heat exchange efficiency between the connecting component and the battery cell.

[0034] The liquid cooling plate has a first pair of connecting pipes on the side facing the connecting part, and the first pair of connecting pipes are connected to the heat exchange channel inside the liquid cooling plate.

[0035] At least two second pairs of connectors are located on the side of the connector facing the liquid cooling plate and are connected to the connector, and each second pair of connectors is connected to the first pair of connectors of a liquid cooling plate.

[0036] Therefore, by setting the heat exchanger as a liquid-cooled plate, the plate shape of the liquid-cooled plate allows for a large heat exchange area with the battery cells, thereby improving the heat exchange efficiency of the battery cells. The design of the first and second pairs of connecting pipes facilitates the docking and assembly of the connecting parts with each liquid-cooled plate.

[0037] In some embodiments, the second pair of pipes is welded to the first pair of pipes.

[0038] This improves the stability and sealing of the connection between the two parts.

[0039] In some embodiments, the second pair of connectors is detachably plugged into the first pair of connectors.

[0040] This allows for convenient plug-in assembly of the second and first pairs of connecting pipes, improving the ease of assembly. Furthermore, the interlocking arrangement after mating increases the contact area, enhancing the stability and sealing of the connection point. Simultaneously, the second and first pairs of connecting pipes can be disassembled, facilitating easy separation of the connecting parts and heat exchange components during replacement or maintenance.

[0041] In some embodiments, one of the second pair of connectors and one of the first pair of connectors are inserted into the other and are snap-fitted together.

[0042] And / or, a sealing ring is provided between the second pair of connectors and the first pair of connectors.

[0043] Therefore, by using a snap-fit ​​connection between the second and first pairs of connectors, the connection structure becomes simpler and the connection more reliable. Furthermore, a sealing ring is provided between the second and first pairs of connectors, allowing for sealing and further improving the sealing performance at the connection point.

[0044] In some embodiments, the battery device further includes a battery case, a heat exchanger and individual battery cells disposed within the battery case;

[0045] The battery box has a first box wall opposite to the first end face, and a connecting member is disposed between the battery cell assembly and the first box wall.

[0046] Therefore, the battery box can isolate and protect the heat exchange components, individual battery cells, and connecting components.

[0047] In some embodiments, the battery device further includes a battery case, a heat exchanger and individual battery cells disposed within the battery case;

[0048] The battery box includes a cover and a body arranged in a first direction, the cover being closed onto the body, and the arrangement direction of the cover and body intersecting with the arrangement direction of the heat exchange components.

[0049] The terminal post is positioned facing the cover, and the connecting piece is located between the cover and the battery cell assembly.

[0050] Therefore, the connecting element can be located above the battery cell assembly, so that it does not occupy space in the stacking direction of the battery cells, which is conducive to improving the energy density of the battery device.

[0051] On the other hand, the electrical equipment proposed in this application includes the battery device of any of the above embodiments. Attached Figure Description

[0052] 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.

[0053] Figure 1 This is a schematic diagram of the structure of one embodiment of the vehicle of this application;

[0054] Figure 2 This is a schematic diagram of the structure of an embodiment of the battery device of this application;

[0055] Figure 3 This is an exploded structural diagram of a single battery cell according to an embodiment of this application;

[0056] Figure 4 This is a partial exploded structural diagram of an embodiment of the battery device of this application;

[0057] Figure 5 This is a schematic diagram of a partial assembly structure of a battery device according to an embodiment of this application;

[0058] Figure 6 This is a schematic diagram of another partial assembly structure of an embodiment of the battery device of this application;

[0059] Figure 7 for Figure 6 A partial structural diagram of the battery device in the diagram;

[0060] Figure 8 for Figure 6 Another partial structural diagram of the battery device in the diagram;

[0061] Figure 9 for Figure 8 A magnified view of a portion of point A in the middle.

[0062] Explanation of icon numbers:

[0063] 100. Battery assembly; 1. Battery box; 1a. Receptacle; 11. Box cover; 111. First box wall; 12. Box body; 20A. Battery cell assembly; 20. Battery cell; 21. End cap; 21a. Terminal post; 211. First end face; 212. Terminal post assembly; 213. Busbar; 22. Housing; 221. Side peripheral surface; 2211. Large surface; 2213. Small surface; 23. Electrode assembly; 231. Tab; 24. Aligned battery cell; 25. Misaligned battery cell; 26. Battery pack; 30. Heat exchanger; 33. Liquid cooling plate; 40. Connecting component; 50. First connecting pipe; 60. Second connecting pipe; 1000. Vehicle; 200. Controller; 300. Motor.

[0064] 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

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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 may include a battery box and individual battery cells housed within the battery box. The battery box may 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 comprising a battery, typically including a battery 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 may 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 may be connected in series, in parallel, or in a hybrid connection including both series and parallel connections.

[0070] Furthermore, since the battery device generates heat during operation, it is typically equipped with a heat exchange mechanism to cool the individual battery cells, ensuring they operate at a suitable temperature. In related technologies, multiple liquid cooling plates are attached to the side circumference of each battery cell for cooling. Simultaneously, connecting members are installed at both ends of the liquid cooling plates along their length, or on opposite sides of the circumference of all battery cells. These connecting members supply and discharge liquid to the multiple liquid cooling plates, forming a circulating heat exchange flow path.

[0071] However, since the connecting piece is located circumferentially in the battery cell, it occupies space in the circumferential direction of the battery cell, thereby reducing the stackable space of the battery cells in the battery box and affecting the energy density of the battery device.

[0072] Therefore, based on the above considerations, in order to solve the problem of low energy density in battery devices in related technologies, this application proposes a novel battery device. This battery device innovatively relocates the connecting member, which connects at least two heat exchange components for heat exchange between battery cells, from its original circumferential location within the battery cell to its location on the side of the battery cell with the terminal post. This prevents the connecting member from occupying circumferential space within the battery cell, optimizing the stacking arrangement of the battery cells and thus improving the energy density of the battery device.

[0073] 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.

[0074] 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.

[0075] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 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 starting, navigation, and driving.

[0076] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0077] 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 includes 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 includes a plurality of battery cells 20, which are disposed inside the battery case 1.

[0078] The battery cell assembly 20A may comprise multiple battery cells 20, which can be connected in series, parallel, or a combination thereof. A combination thereof means that some of the battery cells 20 are connected in series while others are in parallel. When the battery device 100 is in its normal installation and use state, the first direction can be defined as the vertical direction, and the second and third directions can be two intersecting horizontal directions. In this case, the multiple battery cells 20 in the battery cell assembly 20A can be arranged in a row along the second direction, or further, at least two rows can be arranged side-by-side along the third direction. Alternatively, the multiple battery cells 20 in the battery cell assembly 20A can also be arranged in a row along the third direction, or further, at least two rows can be arranged side-by-side along the second direction. This application does not limit the arrangement direction of the multiple battery cells 20 in the battery cell assembly 20A. Of course, the first direction can also be other directions, and this application does not limit the specific direction types of the first, second, and third directions.

[0079] The battery case 1 can be used to form a receiving cavity 1a to provide a space for accommodating the battery cell 20. The battery case 1 can adopt various structures. In some embodiments, the battery case 1 can include a cover 11 and a body 12 that overlap each other to jointly define the receiving cavity 1a for accommodating the battery cell 20. In this case, the body 12 can provide accommodating support for the battery cell 20. In addition, 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 structure and cover the opening side of the body 12. In addition, the battery case 1 formed by the cover 11 and the body 12 can be of various shapes, such as a cylinder, a cuboid, etc. Furthermore, the cover 11 and the body 12 can be arranged along a first direction.

[0080] In addition, the battery device 100 may include other structures, such as a busbar 213, for electrical connection between multiple battery cells 20. Furthermore, each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, cuboid, or other shapes.

[0081] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit constituting the battery device 100. For example... Figure 3 As shown, the battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0082] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved safety performance. Functional components such as terminals 21a can be provided on end cap 21. Terminals 21a can be used to electrically connect to electrode assembly 23 for outputting or inputting electrical energy into battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. 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 element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0083] The housing 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 housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 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 housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 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.

[0084] 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 main 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 main body or separately at both ends of the main 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 circuit.

[0085] Please refer to the reference. Figures 2 to 8 In one embodiment of this application, the battery device 100 further includes a heat exchanger 30 and a connecting member 40; the number of heat exchangers 30 is at least two, and the at least two heat exchangers 30 are arranged at intervals, and the heat exchangers 30 are provided with heat exchange channels; at least one battery cell 20 is provided between two adjacent heat exchangers 30; the battery cell 20 has a first end face 211 and a side peripheral face 221 connected to each other, the first end face 211 is provided with a terminal post 21a, and the side peripheral face 221 is heat-exchange connected to the heat exchanger 30; the connecting member 40 is provided on the side of the battery cell assembly 20A with the terminal post 21a, and is configured to connect the heat exchange channels of at least two heat exchangers 30.

[0086] The heat exchanger 30, with its internal heat exchange channels, allows for the passage of heat exchange media such as water or oil. As the heat exchange media passes through, it carries away the heat transferred from the battery cell 20 to the heat exchanger 30, thus achieving a heat exchange connection between the heat exchanger 30 and the battery cell 20 for cooling the battery cell 20. Of course, in some instances, in environments with relatively low ambient temperatures, passing a higher-temperature heat exchange medium through the heat exchange channels can also heat the battery cell 20. Furthermore, the heat exchange connection proposed in this application refers to the ability of the connected components to exchange heat, including direct contact and indirect heat exchange with air or other objects between them. Additionally, the heat exchange channels inside the heat exchanger 30 can be a cavity or a long strip. When the heat exchange channel inside the heat exchanger 30 extends in a long strip shape, the heat exchange channel can extend linearly, or at least partially in an S-shape, or in a U-shape. This application does not limit the extension shape of the heat exchange channel inside the heat exchanger 30. Furthermore, the number of heat exchangers 30 can be two, or of course three or more. Specifically, with the terminal post 21a of the battery cell 20 facing upwards, at least two heat exchangers 30 can be arranged at intervals in a horizontal direction. Moreover, when the first direction is vertical as described above, and the second and third directions are horizontal, at least two heat exchangers 30 can be arranged at intervals in the second direction or at intervals in the third direction. Therefore, it can be said that the arrangement direction of the heat exchangers 30 intersects with the arrangement direction of the cover 11 and the housing 12. That is, the heat exchangers 30 and the battery cell 20 are stacked horizontally, and the cover 11 is located above the housing 12 in the vertical direction. Furthermore, the provision of at least one battery cell 20 between two adjacent heat exchangers 30 means that, in the arrangement direction of at least two heat exchangers 30, one battery cell 20 can be placed between two adjacent heat exchangers 30, so that the opposite sides of each battery cell 20 can exchange heat through the two adjacent heat exchangers 30, thereby increasing the heat exchange area between the battery cell 20 and the heat exchanger 30 and improving the heat exchange efficiency. Of course, in the arrangement direction of at least two heat exchangers 30, two or more battery cells 20 can also be placed between two adjacent heat exchangers 30, or all battery cells 20 can be placed between two adjacent heat exchangers 30. That is, this application does not limit the arrangement of battery cells 20 and heat exchangers 30; battery cells 20 and heat exchangers 30 can be arranged alternately, or at least two or all of the battery cells 20 can be located between two adjacent heat exchangers 30. In addition, the heat exchanger 30 can be in the form of a plate-shaped liquid cooling plate 33 as described below, or it can be in the form of a tubular liquid cooling pipe. This application does not limit the structural form of the heat exchanger 30.When the heat exchanger 30 is in the form of a liquid cooling pipe, the liquid cooling pipe can be at least partially formed into an S-shape to extend the length of the heat exchange channel, thereby increasing the heat exchange area and improving the heat exchange efficiency.

[0087] The first end face 211 of the battery cell 20 can be located on the end cap 21 of the battery cell 20 for mounting the terminal post 21a. Of course, in some embodiments, an explosion-proof valve or the like can also be further provided. When the battery box 1 includes a box cover 11 and a box body 12 as described above, the first end face 211 can be positioned opposite to the box cover 11 of the battery box 1.

[0088] The side peripheral surface 221 of the battery cell 20 can be located within the casing 22 of the battery cell 20. The side peripheral surface 221 may include two opposing large surfaces 2211 and two opposing small surfaces 2213, where the area of ​​the large surfaces 2211 is larger than the area of ​​the small surfaces 2213. In this case, either the large surfaces 2211 or the small surfaces 2213 can be connected to the heat exchanger 30 for heat exchange. That is, at least two heat exchangers 30 can be arranged along the arrangement direction of the two large surfaces 2211 of the battery cell 20, or they can be arranged along the arrangement direction of the two small surfaces 2213 of the battery cell 20.

[0089] Additionally, the side of the battery cell 20 facing away from the first end face 211 can be used for mounting and fixing to the battery box 1. When the battery box 1 includes a cover 11 and a box body 12 as described above, the side of the battery cell 20 facing away from the first end face 211 can be used for mounting and fixing to the box body 12, and the mounting and fixing method can be adhesive or other methods.

[0090] The connecting member 40 can be a hollow structure to connect at least two heat exchangers 30, thereby enabling liquid supply and / or liquid discharge to each heat exchanger 30. The number of connecting members 40 can be two, as described below, with one connecting member 40 supplying liquid to each heat exchanger 30 and the other connecting member 40 discharging liquid from each heat exchanger 30. Alternatively, more connecting members 40 can be provided, with at least two connecting members 40 supplying liquid to each heat exchanger 30 and at least two connecting members 40 discharging liquid from each heat exchanger 30. Alternatively, the number of connecting members 40 can be one, with separate flow channels to achieve liquid supply and discharge to each heat exchanger 30 through different flow channels. Furthermore, the connecting member 40 is located on the side of the battery cell assembly 20A with the terminal post 21a, meaning that the connecting member 40 is located on the side facing the terminal post 21a in the battery cell assembly 20A. For example, when the terminal post 21a is arranged upwards as described above, the connecting member 40 can be disposed on the top side of the battery cell assembly 20A. Furthermore, since the heat exchanger 30 and the battery cell 20 are disposed within the battery case 1, the cover 11 of the battery case 1 can be defined as having a first case wall 111 opposite to the first end face 211. In this case, it can also be said that the connecting member 40 is disposed between the battery cell assembly 20A and the first case wall 111. Moreover, the connecting member 40 being disposed on the side of the battery cell assembly 20A with the terminal post 21a includes the case where the connecting member 40 and the terminal post 21a are stacked along the normal direction of the first end face 211; of course, it also includes the case where the connecting member 40 and the terminal post 21a are arranged side-by-side on the first end face 211. Additionally, the connecting member 40 can be linear or arc-shaped; and the shape of the connecting member 40 in its extension direction can be rectangular, square, or elliptical, etc. This application does not limit the extension shape or cross-sectional shape of the connecting member 40.

[0091] In the battery device 100 of this application, a connecting member 40 for connecting at least two heat exchange members 30 is provided on the side of the battery cell assembly 20A with the terminal post 21a, so that the connecting member 40 does not occupy the circumferential space of the battery cell assembly 20A in the battery box 1, so that more battery cells 20 can be stacked in the limited space in the battery box 1, thereby improving the energy density of the battery device 100.

[0092] Please refer to the reference. Figures 2 to 7 In one embodiment of this application, the normal direction of the first end face 211 is defined as the first direction, and the battery cell 20 that is disposed opposite to the connecting member 40 in the first direction is the aligned battery cell 24; on a projection plane perpendicular to the first direction, the projection of the connecting member 40 does not overlap with the projection of the terminal post 21a in the aligned battery cell 24.

[0093] When the first direction is vertical as described above, the aligned battery cell 24 can be a battery cell 20 located below the connecting member 40, such that the projection of the connecting member 40 on the horizontal projection plane can overlap with the projection of the aligned battery cell 24 on the horizontal projection plane. All battery cells 20 in the battery cell assembly 20A can be configured as aligned battery cells 24. Alternatively, only some battery cells 20 can be configured as aligned battery cells 24, and the projections of the other battery cells 20 on the horizontal projection plane can not overlap with the projection of the connecting member 40 on the horizontal projection plane, thus forming misaligned battery cells 25. Furthermore, on a projection plane perpendicular to the first direction, the projection of the connecting member 40 and the projection of the terminal post 21a in the aligned battery cell 24 not overlapping means that the connecting member 40 and the terminal post 21a in the aligned battery cell 24 can be spaced apart in the horizontal direction, or they can be in contact on opposite sides. Furthermore, the connecting member 40 can be arranged on at least one side of the two terminals 21a in the aligned battery cell 24, or it can be arranged between the two terminals 21a in the aligned battery cell 24.

[0094] In this embodiment, the connecting member 40 and the terminal post 21a in the aligned battery cell 24 are horizontally offset. A busbar 213 is typically stacked above the terminal post 21a to electrically connect two adjacent battery cells 20. Therefore, the offset arrangement of the connecting member 40 and the terminal post 21a in the aligned battery cell 24 prevents further stacking of the connecting member 40 with the terminal post 21a and busbar 213 in the first direction, thus avoiding a high stacking height. This improves the compactness of the stacked arrangement of the connecting member 40 and the battery cell assembly 20A in the first direction, thereby reducing the overall height of the battery device 100 in the first direction. Specifically, on a projection plane parallel to the first direction, the projections of the busbar 213 and the terminal post 21a may not overlap, allowing the busbar 213 to be attached to the upper surface of the terminal post 21a. Alternatively, the projections of the busbar 213 and the terminal post 21a may overlap, allowing the busbar 213 to be fitted onto the terminal post 21a.

[0095] Please refer to the reference. Figure 2 , Figure 3 as well as Figure 7 In one embodiment of this application, on a projection plane parallel to the first direction, the projection of the electrode post 21a in the battery cell 24 at least partially overlaps with the projection of the connecting member 40.

[0096] On a projection plane parallel to the first direction, this projection plane refers to the projection plane perpendicular to the parallel direction of the connecting member 40 and the pole post 21a on the first end face 211. For example, when the connecting member 40 is disposed on at least one side of the arrangement direction of the two pole posts 21a in the pole post assembly 212 as described below, this projection plane can be the projection plane perpendicular to the arrangement direction of the two pole posts 21a in the pole post assembly 212.

[0097] In this embodiment, since at least a portion of the terminal post 21a protrudes from the first end face 211, and a busbar 213 is further stacked above the terminal post 21a (or, in other words, the busbar 213 is stacked along the first direction at the end of the terminal post 21a away from the battery cell 20), a spatial gap is formed between the first end face 211 and the first casing wall 111 by the stacked terminal post 21a and the busbar 213. At this time, the projection of the terminal post 21a in the aligned battery cell 24 is set to at least partially overlap with the projection of the connecting member 40, so that the terminal post 21a and the connecting member 40 can at least partially overlap in the first direction. This allows the connecting member 40 to be installed within this spatial gap without increasing or excessively increasing the height dimension of the battery device 100 in the first direction. This improves the utilization rate of the space inside the battery casing 1, thereby reducing the overall volume of the battery device 100.

[0098] Additionally, it should be noted that the connecting member 40 and the first end face 211 of the aligned battery cell 24 can be in contact or spaced apart. The height of the connecting member 40 in the first direction can be equal to the stacked height of the terminal post 21a and the busbar 213 (i.e., the overall height of the terminal post 21a protruding from the first end face 211 and the busbar 213 after stacking), or it can be less than the stacked height of the terminal post 21a and the busbar 213. Both methods ensure that the height of the battery device 100 is not increased after installing the connecting member 40, thus better utilizing the spatial gap formed by the stacked terminal post 21a and the busbar 213. In other words, the distance between the side of the connecting member 40 facing away from the first end face 211 and the first end face 211 is less than or equal to the distance between the side of the busbar 213 facing away from the first end face 211 and the first end face 211. Alternatively, in some embodiments, the height of the connecting member 40 in the first direction can also be greater than the stacked height of the terminal post 21a and the busbar 213. At this time, the cover 11 in the battery box 1 can be partially protruded outward at the position corresponding to the connecting member 40. However, since the stacking height space of the pole post 21a and the busbar 213 is utilized, the height dimension of the battery device 100 will not be excessively increased.

[0099] In other embodiments, on a projection plane parallel to the first direction, the projection of the terminal post 21a in the battery cell 24 and the projection of the connecting member 40 may be configured not to overlap, with the projection of the busbar 213 stacked on the terminal post 21a and the projection of the connecting member 40 being configured to at least partially overlap.

[0100] Please refer to the reference. Figure 5 and Figure 6 In one embodiment of this application, the first end face 211 is provided with two pole posts 21a arranged at intervals. The two pole posts 21a are constructed as pole post assemblies 212, and the connecting member 40 is provided on at least one side of the pole post assembly 212 of the battery cell 24.

[0101] The two terminals 21a in the terminal assembly 212 can respectively form a positive terminal 21a and a negative terminal 21a. The connecting member 40 is disposed on at least one side of the terminal assembly 212 aligning with the battery cell 24. This means that the connecting member 40 can be disposed on at least one side of the arrangement direction of the two terminals 21a in the terminal assembly 212, or at least one side of the terminal assembly 212 along the arrangement direction of the two small faces 2213 in the battery cell 20. At this time, the heat exchange member 30 is arranged along the arrangement direction of the two large faces 2211 in the battery cell 20 and is heat-exchange connected to the large faces 2211. Alternatively, the connecting member 40 can also be disposed on at least one side of the centerline direction between the two terminals 21a, or at least one side of the terminal assembly 212 along the arrangement direction of the two large faces 2211 in the battery cell 20. At this time, the heat exchanger 30 is arranged along the arrangement direction of the two small faces 2213 in the battery cell 20 and is connected to the small faces 2213 for heat exchange.

[0102] In this embodiment, the connecting member 40 is disposed on at least one side of the terminal post assembly 212 of the aligned battery cell 24, so that the connecting member 40 does not occupy the space between the two terminals 21a in the terminal post assembly 212, thereby facilitating the installation and arrangement of other components in the battery device 100 at that location, such as a battery sampling assembly, which may include a flexible circuit board, a temperature sensor, and a voltage sensor. This facilitates the connection of the battery sampling assembly to the terminals 21a on both sides, enabling the acquisition of signals such as temperature and voltage of the battery cell 20.

[0103] Please refer to the reference. Figure 5 and Figure 6 In one embodiment of this application, at least two heat exchange elements 30 are arranged along a second direction, and two poles 21a in the pole assembly 212 are arranged along a third direction, with the first direction, the second direction and the third direction intersecting each other; along the third direction, a connecting member 40 is provided on at least one side of the pole assembly 212 in the battery cell 24.

[0104] Since the two terminals 21a in the terminal assembly 212 are arranged along a third direction, the second direction can be the arrangement direction of the two large surfaces 2211 in the battery cell 20, or the width direction of the battery cell 20. The third direction can be the arrangement direction of the two small surfaces 2213 in the battery cell 20, or the length direction of the battery cell 20.

[0105] In this embodiment, the connecting member 40 is positioned on at least one side of the terminal post assembly 212 in the aligned battery cell 24, facing upwards. This allows both the connecting member 40 and the two terminals 21a to be arranged along the length of the battery cell 20, fully utilizing the space of the first end face 211 along the length of the battery cell 20 and improving the ease of arrangement of the connecting member 40 and the two terminals 21a. Simultaneously, this arrangement also allows the heat exchange member 30 to connect with the large surface 2211 of the battery cell 20, increasing the heat exchange area and thus improving the heat exchange efficiency of the battery cell 20. In other words, this arrangement of the connecting member 40 balances the convenience of space utilization with the heat exchange efficiency of the battery cell 20.

[0106] Please refer to the reference. Figure 2 and Figure 7 In one embodiment of this application, the length of the connecting member 40 in the first direction is defined as D1, and the length in the third direction is defined as D2, satisfying the relationship: D1 < D2.

[0107] In this embodiment, D1 is set to be less than D2, allowing the connecting member 40 to be flat, minimizing its height in the first direction while fully utilizing the space on one side of the electrode assembly 212 in the third direction. At this point, the stacking height of the electrode 21a and busbar 213 can be effectively utilized between the first end face 211 and the first housing wall 111 to complete the installation arrangement of the connecting member 40; simultaneously, the connecting member 40 can still have a large cross-section to meet the flow rate of the heat exchange medium, thereby achieving a balance between heat exchange efficiency and that of the battery cell 20.

[0108] When D1 < D2, the projection surface of the connecting member 40 perpendicular to the second direction can be set as a rectangle. In this case, the shape of the connecting member 40 can be more regular, and each side can adapt and correspond to the first end face 211, the pole post 21a, and the first box wall 111, thereby improving space utilization and also increasing the convenience of processing and manufacturing the connecting member 40. Of course, in other embodiments, the projection surface of the connecting member 40 perpendicular to the second direction is set as an ellipse.

[0109] Please refer to the reference. Figure 5 , Figure 6 as well as Figure 8In one embodiment of this application, there are two connecting members 40, which are arranged side by side in a third direction and are respectively configured to connect the heat exchange channels in at least two heat exchange members 30.

[0110] In this embodiment, the number of connecting parts 40 is set to two, so that one of the two connecting parts 40 can be used as an inlet pipe and the other can be used as an outlet pipe, so that the volume of a single connecting part 40 does not need to be too large, thus facilitating its installation and arrangement in a limited space.

[0111] Please refer to the reference. Figure 5 , Figure 6 as well as Figure 8 In one embodiment of this application, along a third direction, a connecting member 40 is provided on one side of all pole posts 21a, and another connecting member 40 is provided on the other side of all pole posts 21a.

[0112] In this embodiment, two connecting members 40 are respectively disposed on both sides of all the pole posts 21a in the third direction, so that the two connecting members 40 can be respectively connected to the two ends of the heat exchanger 30 in the third direction, so that the heat exchange medium can enter from one end of the heat exchanger 30 in the third direction and then flow out from the other end in the third direction, so as to make full use of the length space of the heat exchanger 30 in the third direction to arrange the heat exchange channel, extend the length of the heat exchange channel to increase the heat exchange area and improve the heat exchange efficiency of the battery cell 20.

[0113] In this battery cell assembly 20A, the battery cells 20 can be arranged along a second direction to form a battery pack 26. In this case, the battery cell assembly 20A may include only one battery pack 26, or it may include at least two battery packs 26 arranged side-by-side along a third direction. When the battery cell assembly 20A includes only one battery pack 26, in the third direction, two connecting members 40 can be respectively provided on both sides of all the terminals 21a in the battery pack 26. When the battery cell assembly 20A includes at least two battery packs 26 arranged side-by-side, in the third direction, one connecting member 40 can be provided on one side of all the terminals 21a in the battery pack 26 located at one end, and the other connecting member 40 can be provided on the other side of all the terminals 21a in the battery pack 26 located at the other end.

[0114] Of course, this application is not limited to this. When the battery cell assembly 20A includes at least two side-by-side battery packs 26, the connecting member 40 may also be disposed between two adjacent terminals 21a in two adjacent battery packs 26.

[0115] Please refer to Figure 8 In one embodiment of this application, the connecting member 40 extends along the second direction and communicates with the heat exchange channels in all the heat exchange members 30.

[0116] In this embodiment, the connecting member 40 is extended along the second direction as an elongated strip to facilitate communication with the heat exchange channels in all heat exchange components 30. This allows for liquid supply and / or discharge to all heat exchange components 30 through the connecting member 40 alone, thereby simplifying the number of components in the battery device 100. Simultaneously, the connecting member 40 can also be linear and have a regular extension shape, facilitating its installation and arrangement.

[0117] In one embodiment of this application, the connecting member 40 is made of an insulating material.

[0118] In this embodiment, the connecting member 40 is made of an insulating material, which reduces the possibility of an electrical short circuit between it and the terminal 21a, thereby improving the reliability of the battery device 100. The connecting member 40 can be made of plastic, such as nylon or polyvinylidene fluoride; of course, it can also be made of fiber-reinforced composite materials, such as glass fiber reinforced epoxy resin tubes or glass fiber reinforced nylon tubes. This application does not limit the specific material type of the connecting member 40.

[0119] In one embodiment of this application, the connecting member 40 is made of a thermally conductive material.

[0120] In this embodiment, the connecting member 40 is made of a thermally conductive material. This allows the connecting member 40 to not only connect the various heat exchange components 30, but also to exchange heat with the battery cell 20 as the heat exchange medium passes through it, thus improving the heat exchange efficiency of the battery cell 20. Specifically, when the connecting member 40 is positioned on one side of the electrode post 21a as described above, and their projections in the vertical first direction do not overlap, the connecting member 40 can be thermally connected to the first end face 211, or to the electrode post 21a, or simultaneously to both the first end face 211 and the electrode post 21a. Furthermore, the material of the connecting member 40 can be metal, as described below, or it can be thermally conductive plastic.

[0121] In one embodiment of this application, the connecting member 40 is made of metal, and an insulating layer is provided on the outside of the connecting member 40.

[0122] In this embodiment, the connecting member 40 is made of metal to provide better thermal conductivity, thereby improving the heat exchange efficiency between the connecting member 40 and the battery cell 20. Furthermore, an insulating layer is provided on the outside of the connecting member 40 to reduce the possibility of electrical short circuits between it and the terminal 21a, thus improving the reliability of the battery device 100. The connecting member 40 can be made of metals such as aluminum or copper. The insulating layer can be an insulating coating, such as a UV-cured coating or an epoxy resin coating; alternatively, it can be an insulating film, such as a polyethylene terephthalate film or a polyimide film.

[0123] In one embodiment of this application, a thermal interface material layer is provided between the connecting member 40 and the battery cell 20.

[0124] Thermal interface material (TIM) is a general term for materials used to reduce the contact thermal resistance between two heat exchange components. These materials can include thermal grease, thermal pads, silicone, or thermal adhesives.

[0125] In this embodiment, a thermal interface material layer is provided between the connecting member 40 and the battery cell 20, so that the thermal resistance between the two can be reduced through the thermal interface material layer, thereby further improving the heat exchange efficiency of the connecting member 40 to the battery cell 20.

[0126] Please refer to the reference. Figure 8 and Figure 9 In one embodiment of this application, the heat exchanger 30 is a liquid cooling plate 33, and the battery device 100 further includes a first pair of connecting pipes 50 and at least two second pairs of connecting pipes 60; the first pair of connecting pipes 50 is provided on the side of the liquid cooling plate 33 facing the connecting member 40, and the first pair of connecting pipes 50 is connected to the heat exchange channel in the liquid cooling plate 33; at least two second pairs of connecting pipes 60 are provided on the side of the connecting member 40 facing the liquid cooling plate 33 and are connected to the connecting member 40, and each second pair of connecting pipes 60 is connected to the first pair of connecting pipes 50 of a liquid cooling plate 33.

[0127] When the pole post 21a is positioned upwards as described above, the first pair of connecting pipes 50 can be positioned on the upper side of the liquid cooling plate 33, and the second pair of connecting pipes 60 can be positioned on the lower side of the connecting member 40. The first pair of connecting pipes 50 and the liquid cooling plate 33 can be an integrally formed structure, or they can be separate structures connected by welding or bonding. Similarly, the second pair of connecting pipes 60 and the connecting member 40 and the liquid cooling plate 33 can be an integrally formed structure, or they can be separate structures connected by welding or bonding. Furthermore, the integrally formed structure proposed in this application refers to a structure prepared by an integral forming manufacturing process, such as integral extrusion molding, integral die casting, or integral injection molding.

[0128] In this embodiment, the heat exchanger 30 is configured as a liquid cooling plate 33, which, being plate-shaped, provides a large heat exchange area with the battery cell 20, thereby improving the heat exchange efficiency of the battery cell 20. The first pair of connecting pipes 50 and the second pair of connecting pipes 60 facilitate the docking and assembly of the connecting member 40 and each liquid cooling plate 33. Of course, in other embodiments, connecting ports can be directly provided on the connecting member 40 and the heat exchanger 30, allowing the connecting member 40 and the heat exchanger 30 to be directly connected through their respective connecting ports.

[0129] In one embodiment of this application, the second connector 60 is welded to the first connector 50.

[0130] In this embodiment, the second connecting pipe 60 and the first connecting pipe 50 are welded together, which can improve the stability and sealing of the two at the docking connection.

[0131] In one embodiment of this application, the second pair of connectors 60 is detachably plugged into the first pair of connectors 50.

[0132] A detachable plug-in connection means that the second pair of connectors 60 and the first pair of connectors 50 can still be disassembled after being plugged in and assembled. The second pair of connectors 60 and the first pair of connectors 50 can be fixed by snap-fit ​​as described below, or by magnetic attraction, or by using a clamping ring on the outside of the second pair of connectors 60 or the first pair of connectors 50 to clamp and fix the connected second pair of connectors 60 and the first pair of connectors 50.

[0133] In this embodiment, the second pair of connecting pipes 60 and the first pair of connecting pipes 50 are detachably plugged in, allowing for convenient plug-in assembly and improving the ease of assembly. Furthermore, the interlocking arrangement after docking increases the contact area, enhancing the stability and sealing of the connection point. Simultaneously, the second pair of connecting pipes 60 and the first pair of connecting pipes 50 can be disassembled, facilitating the separation of the connecting member 40 and the heat exchange member 30 for replacement or maintenance.

[0134] In one embodiment of this application, one of the second pair of connectors 60 and the first pair of connectors 50 is inserted into the other and is fixed in a snap-fit ​​manner.

[0135] In this embodiment, the second pair of connecting tubes 60 and the first pair of connecting tubes 50 are configured to be snap-fitted, which simplifies the connection structure and ensures a reliable connection. Specifically, one of the second pair of connecting tubes 60 and the first pair of connecting tubes 50 may be provided with a snap-fit, while the other may be provided with a slot, allowing the snap-fit ​​to elastically engage with the slot after assembly. For example, when the first pair of connecting tubes 50 is inserted into the second pair of connecting tubes 60, one of the snap-fit ​​and the slot may be provided on the outer side of the first pair of connecting tubes 50, while the other of the snap-fit ​​and the slot may be provided on the inner side of the second pair of connecting tubes 60.

[0136] In one embodiment of this application, a sealing ring is provided between the second connecting pipe 60 and the first connecting pipe 50.

[0137] In this embodiment, a sealing ring is further provided between the second connector 60 and the first connector 50, so that the second connector 60 and the first connector 50 can be sealed by the sealing ring after they are plugged and assembled, which helps to further improve the sealing performance of the second connector 60 and the first connector 50 at the docking and communication point.

[0138] Please refer to the reference. Figures 2 to 9In one embodiment of this application, the battery device 100 includes at least two heat exchange elements 30, a battery cell assembly 20A, and a connecting member 40; the at least two heat exchange elements 30 are arranged at intervals, and each heat exchange element 30 is provided with a heat exchange channel; the battery cell assembly 20A includes at least two battery cells 20, and at least one battery cell 20 is provided between two adjacent heat exchange elements 30; the battery cell 20 has a first end face 211 and a side peripheral face 221 connected to each other, the first end face 211 is provided with a terminal post 21a, and the side peripheral face 221 is heat-exchange connected to the heat exchange elements 30; the connecting member 40 is provided on the side of the battery cell assembly 20A with the terminal post 21a, and is configured to connect the heat exchange channels of at least two heat exchange elements 30. The normal direction of the first end face 211 is defined as the first direction, and the battery cell 20 arranged opposite to the connecting member 40 in the first direction is called the aligned battery cell 24. On a projection plane perpendicular to the first direction, the projection of the connecting member 40 does not overlap with the projection of the terminal post 21a in the aligned battery cell 24. On a projection plane parallel to the first direction, the projection of the terminal post 21a in the aligned battery cell 24 at least partially overlaps with the projection of the connecting member 40. The first end face 211 has two terminal posts 21a arranged at intervals, and the two terminal posts 21a are constructed as a terminal post assembly 212. The connecting member 40 is located on at least one side of the terminal post assembly 212 in the aligned battery cell 24. At least two heat exchange members 30 are arranged along the second direction, and the two terminal posts 21a in the terminal post assembly 212 are arranged along a third direction. The first direction, the second direction, and the third direction intersect each other. Along the third direction, the connecting member 40 is located on at least one side of the terminal post assembly 212 in the aligned battery cell 24. The length of the connecting member 40 in the first direction is defined as D1, and its length in the third direction is defined as D2, satisfying the relationship: D1 < D2. There are two connecting members 40, arranged side-by-side in the third direction, each configured to connect to the heat exchange channels in at least two heat exchange components 30. Along the third direction, one connecting member 40 is located on one side of all poles 21a, and the other connecting member 40 is located on the other side of all poles 21a. The connecting member 40 extends along the second direction and connects to the heat exchange channels in all heat exchange components 30. The connecting member 40 is made of insulating material. The heat exchanger 30 is a liquid-cooled plate 33. The battery device 100 also includes a first pair of connecting pipes 50 and at least two second pairs of connecting pipes 60. The first pair of connecting pipes 50 is provided on the side of the liquid-cooled plate 33 facing the connecting member 40, and the first pair of connecting pipes 50 communicates with the heat exchange channels in the liquid-cooled plate 33. At least two second pairs of connecting pipes 60 are provided on the side of the connecting member 40 facing the liquid-cooled plate 33 and communicate with the connecting member 40. Each second pair of connecting pipes 60 communicates with a first pair of connecting pipes 50 of a liquid-cooled plate 33. The second pairs of connecting pipes 60 are welded to the first pair of connecting pipes 50.The battery device 100 also includes a battery box 1, a heat exchanger 30 and a battery cell 20 disposed inside the battery box 1; the battery box 1 has a first box wall 111 opposite to the first end face 211, and a connecting member 40 is disposed between the battery cell assembly 20A and the first box wall 111.

[0139] 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: At least two heat exchange elements are provided, and the at least two heat exchange elements are arranged at intervals, and the heat exchange elements are provided with heat exchange channels; A battery cell assembly, comprising at least two battery cells, with at least one battery cell positioned between two adjacent heat exchangers; each battery cell has a first end face and a side peripheral face connected together, the first end face having an electrode post, and the side peripheral face being heat-exchangeably connected to the heat exchanger; and A connecting member is disposed on one side of the battery cell assembly having the terminal post and configured to connect the heat exchange channels of at least two of the heat exchange members; The normal direction of the first end face is defined as the first direction, and the battery cell that is disposed opposite to the connecting member in the first direction is the aligned battery cell; on a projection plane perpendicular to the first direction, the projection of the connecting member does not overlap with the projection of the electrode post in the aligned battery cell; on a projection plane parallel to the first direction, the projection of the electrode post in the aligned battery cell overlaps at least partially with the projection of the connecting member. The battery device further includes a busbar, which is stacked along the first direction at the end of the terminal post away from the battery cell and configured to electrically connect two adjacent battery cells. The distance between the side of the connector facing away from the first end face and the first end face is less than or equal to the distance between the side of the busbar facing away from the first end face and the first end face.

2. The battery device as claimed in claim 1, characterized in that, The first end face is provided with two pole posts arranged at intervals, the two pole posts are constructed as pole post assemblies, and the connecting member is provided on at least one side of the pole post assembly in the aligned battery cell.

3. The battery device as claimed in claim 2, characterized in that, At least two of the heat exchange elements are arranged along the second direction, and two of the poles in the pole assembly are arranged along the third direction, wherein the first direction, the second direction, and the third direction intersect each other; Along the third direction, the connecting member is disposed on at least one side of the terminal assembly in the opposing battery cell.

4. The battery device as claimed in claim 3, characterized in that, The length of the connecting element in the first direction is defined as D1, and the length in the third direction is defined as D2, satisfying the relationship: D1 < D2.

5. The battery device as claimed in claim 3, characterized in that, The number of the connecting elements is two, and the two connecting elements are arranged side by side in the third direction and are respectively configured to connect the heat exchange channels in at least two of the heat exchange elements.

6. The battery device as claimed in claim 5, characterized in that, Along the third direction, one of the connecting members is located on one side of all the pole posts, and the other connecting member is located on the other side of all the pole posts.

7. The battery device as claimed in claim 3, characterized in that, The connecting member extends along the second direction and communicates with the heat exchange channels in all of the heat exchange members.

8. The battery device according to any one of claims 1 to 7, characterized in that, The connecting component is made of insulating material.

9. The battery device according to any one of claims 1 to 7, characterized in that, The connecting component is made of a thermally conductive material.

10. The battery device as claimed in claim 9, characterized in that, The connecting component is made of metal, and an insulating layer is provided on the outside of the connecting component; And / or, a thermal interface material layer is provided between the connecting member and the battery cell.

11. The battery device according to any one of claims 1 to 7, characterized in that, The heat exchanger is a liquid cooling plate, and the battery device further includes a first pair of connecting pipes and at least two second pairs of connecting pipes; The liquid cooling plate is provided with the first pair of connecting pipes on the side facing the connecting member, and the first pair of connecting pipes are connected to the heat exchange channel inside the liquid cooling plate. At least two second pairs of connectors are provided on the side of the connector facing the liquid cooling plate and are in communication with the connector, and each second pair of connectors is in communication with the first pair of connectors of the liquid cooling plate.

12. The battery device as claimed in claim 11, characterized in that, The second pair of connecting pipes is welded to the first pair of connecting pipes.

13. The battery device as claimed in claim 11, characterized in that, The second pair of connectors is detachably plugged into the first pair of connectors.

14. The battery device as claimed in claim 13, characterized in that, The second pair of connectors is inserted into the other of the first pair of connectors and is fixed in a snap-fit ​​manner; And / or, a sealing ring is provided between the second pair of connectors and the first pair of connectors.

15. The battery device according to any one of claims 1 to 7, characterized in that, The battery device further includes a battery box, and the heat exchanger and the battery cell are disposed inside the battery box; The battery box has a first box wall opposite to the first end face, and the connecting member is disposed between the battery cell assembly and the first box wall.

16. The battery device according to any one of claims 1 to 7, characterized in that, The battery device further includes a battery box, and the heat exchanger and the battery cell are disposed inside the battery box; The battery box includes a cover and a body arranged in the first direction, the cover covering the body, and the arrangement direction of the cover and the body intersects with the arrangement direction of the heat exchanger. The terminal post is positioned toward the cover, and the connecting member is located between the cover and the battery cell assembly.

17. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 16.

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