Battery devices, battery clusters, power consumption devices and energy storage devices

Abstract

The embodiments of the present application provide a battery device, a battery cluster, an electrical device and an energy storage device. The battery device includes a battery case, a battery management system connection module, at least one battery cell assembly and at least one sampling assembly. The battery case includes a plurality of case walls, and the plurality of case walls enclose a closed accommodating cavity. At least one battery cell assembly is accommodated in the accommodating cavity. The sampling assembly includes a sampling piece and a sampling connector, the sampling piece is located in the accommodating cavity, and the sampling connector is connected between the sampling piece and the battery management system connection module. The battery case has at least one through-hole, the sampling connector is passed through the through-hole, and is connected to the sampling piece in the accommodating cavity and to the battery management system connection module outside the accommodating cavity. The grouping efficiency is improved, thereby improving the energy density.

Description

Technical Field

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

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

[0003] In the existing battery system, humans have increasingly higher requirements for the performance of battery devices. Among them, the energy density of battery devices is one of the indicators for measuring the performance of battery devices. Therefore, how to improve the energy density of battery devices is one of the research directions in the industry. Summary of the Invention

[0004] To solve the above technical problems, embodiments of the present application provide a battery device that improves grouping efficiency and thus energy density, as well as a battery cluster, an electrical device, and an energy storage device including the battery device.

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

[0006] A first aspect of an embodiment of the present application provides a battery device, including:

[0007] The battery box comprises a plurality of box walls, wherein the plurality of box walls enclose a sealed accommodating cavity;

[0008] At least one battery cell assembly is accommodated in the accommodation cavity;

[0009] A battery management system connection module is located outside the accommodating cavity;

[0010] At least one sampling assembly, the sampling assembly comprising a sampling piece and a sampling connector, the sampling piece being located in the accommodating cavity, and the sampling connector being connected between the sampling piece and the battery management system connection module;

[0011] The battery box has at least one through-hole, the sampling connector is passed through the through-hole, and is connected to the sampling component in the accommodating cavity and is connected to the battery management system connection module outside the accommodating cavity.

[0012] Because the multiple housing walls enclose a sealed containment cavity, the interior of the battery housing forms a sealed space, providing a stable environment for components located within the battery housing (e.g., battery cells) protected from external interference. Therefore, the battery assembly can be assembled into an electrical device or energy storage device without further enclosure, as with a battery module. By connecting the sampling connector to the sampling component within the containment cavity and to the battery management system connection module outside the containment cavity, the battery management system and components such as the battery management system connection module can be installed outside the battery housing, eliminating the need for conventional transfer installation within the battery housing (i.e., the containment cavity). This reduces the number of components, space occupied, and operational space within the battery housing, thereby improving the overall assembly efficiency of the battery assembly and, consequently, the volumetric energy density of the battery assembly. Furthermore, the battery management system and the battery housing can be directly connected without intermediary components. This not only reduces the number of components, material costs, and production costs, but also mitigates the risk of poor connection between intermediary components and improves connection reliability. In addition, the battery case is provided with a through-hole so that the sampling connector is passed through the through-hole. While realizing the arrangement of the sampling connector, it can also avoid the situation where the battery case is crushed or damaged by the sampling connector to a certain extent.

[0013] In some embodiments, the plurality of box walls include a first wall, a second wall, and a plurality of side walls, wherein the first wall and the second wall are arranged opposite to each other along a first direction, a first end of each side wall along the first direction is connected to the first wall, and a second end of each side wall along the first direction is connected to the second wall;

[0014] The through opening is between the first end of at least one of the side walls and the first wall, and / or

[0015] The through opening is between the second end of at least one of the side walls and the second wall.

[0016] Since a through opening is formed by the end of the side wall and the first wall and / or the second wall, the sampling connector connected to the sampling piece can extend across the side wall to the outside of the accommodating cavity, and does not occupy the space between the wall surface of the side wall and the battery cell assembly. The side wall can be close to the battery cell assembly, which can further improve the overall grouping efficiency of the battery device and further improve the volume energy density.

[0017] In some embodiments, when the through-opening is provided between the first end of at least one of the side walls and the first wall, the first end of at least one of the side walls has a first notch partially recessed along a first direction, and the first notch constitutes the through-opening, and / or,

[0018] In the case where the through opening is provided between the second end of at least one of the side walls and the second wall, the second end of at least one of the side walls has a second notch partially recessed along the first direction, and the second notch constitutes the through opening.

[0019] With such a design, the through-hole can be formed in a simple process, and it is also convenient to assemble the sampling connector into the through-hole.

[0020] In some embodiments, the battery box further includes a sealing structure.

[0021] The sealing structure is between the first end of at least one of the side walls and the first wall, and the through-hole is formed in the sealing structure, or,

[0022] The sealing structure is between the second end of at least one of the side walls and the second wall, and the through-hole is formed in the sealing structure.

[0023] Since the through-port is formed in the sealing structure, after the second section is passed through the through-port, the sealing structure can seal the through-port, thereby the battery case can be sealed, providing a stable internal environment for the components (such as battery cells) located inside the battery case, thereby reducing the probability of the components (such as battery cells) inside the battery case being damaged or destroyed by the external environment, and improving the reliability of the battery device.

[0024] In some embodiments, the battery cell includes an electrode terminal, and along the first direction, the electrode terminal is close to the first wall, and the through-hole is located between the first end of the side wall and the first wall.

[0025] In this way, the sampling connector can be arranged on the same side of the side wall, which is convenient for installation; moreover, the path of the sampling connector extending from the inside of the accommodating cavity to the outside of the accommodating cavity can be shortened, which can reduce the space occupied by the sampling connector extending in the accommodating cavity; and, since the sampling connector is shorter, the weight can be reduced accordingly, reducing material costs.

[0026] In some embodiments, the battery device includes a battery management system, the battery management system is located outside the accommodating cavity, and the battery management system connection module is connected to the battery management system.

[0027] This further reduces the number of components and space occupied within the battery case, further improving the overall battery assembly efficiency and, consequently, the volumetric energy density of the battery assembly. Furthermore, it further facilitates the connection between the battery management system connection module and the battery management system. Furthermore, the battery management system can be quickly disassembled, maintained, and replaced without disassembling the battery case, facilitating rapid disassembly, maintenance, and replacement of the battery management system.

[0028] In some embodiments, the battery management system includes a mounting shell and an integrated circuit board, the integrated circuit board is disposed in the mounting shell, and at least a portion of the battery management system connection module extends into the mounting shell and is electrically connected to the integrated circuit board.

[0029] By arranging the integrated circuit board in the mounting shell, the mounting shell can provide a stable environment for components such as the integrated circuit board located inside the mounting shell that is free from interference from the external environment, thereby improving the connection reliability between the sampling component and the battery management system.

[0030] In some embodiments, the mounting shell includes a first shell and a second shell, the edge of the first shell has a circle of first sealing surface, and the edge of the second shell has a circle of second sealing surface.

[0031] The battery management system further includes a sealing ring, and the first shell is connected to the second shell so that the sealing ring is sandwiched between the first sealing surface and the second sealing surface.

[0032] In some embodiments, at least a portion of the sampling connector extends into the mounting shell, and the sealing ring is provided on both a side of the sampling connector close to the first shell and a side close to the second shell.

[0033] Since the sealing ring is sandwiched between the first sealing surface and the second sealing surface, the sealing member can seal the gap between the first sealing surface and the second sealing surface.

[0034] In some embodiments, the sampling component includes a sampling line array, and the sampling line array is integrated from a plurality of sampling line bundles.

[0035] By setting the sampling piece to include a sampling wire row, on the one hand, it is beneficial to manage the routing of the sampling wire harness, which can improve the assembly efficiency and improve the messy routing situation. On the other hand, it can reduce the space occupied by the sampling piece in the height direction of the battery box, thereby improving the energy density.

[0036] In some embodiments, the battery cell assembly includes a connecting bar and a plurality of battery cells, and adjacent battery cells are connected by the connecting bar;

[0037] The plurality of sampling harnesses include a voltage sampling harness, and the voltage sampling harness is connected to the connection bar; and / or,

[0038] The plurality of sampling harnesses include a temperature sampling harness, the sampling component further includes a temperature sensor, the temperature sampling harness is connected to the temperature sensor, and the temperature sensor is disposed on the connecting bar.

[0039] In some embodiments, the battery cell components correspond to the sampling components on a one-to-one basis.

[0040] That is, there are multiple battery cell assemblies and multiple sampling assemblies, and each battery cell assembly is electrically connected to the first connecting section of each sampling assembly.

[0041] In some embodiments, the sampling connecting member includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence, wherein the first connecting segment is located in the accommodating cavity and connected to the sampling member, the third connecting segment is located outside the accommodating cavity, and the second connecting segment is provided through the through-hole.

[0042] The third connecting section of the sampling connecting piece is bent relative to the second connecting section and extends along the wall surface of the side wall.

[0043] Therefore, the third connecting section of the sampling connector can be arranged close to the side wall, and the third connecting section of the sampling connector and the battery box can be arranged closely, thereby reducing the overall size of the battery device.

[0044] In some embodiments, there are multiple sampling connectors, and the third connecting sections of some of the sampling connectors extend along the first direction, while the third connecting sections of another portion of the sampling connectors first extend along the first direction and then extend along the second direction, wherein the first direction and the second direction intersect each other.

[0045] Therefore, the third connection sections of some sampling connectors and the third connection sections of another part of sampling connectors extend in different directions, which facilitates the connection between different sampling connectors and the battery management system.

[0046] In some embodiments, the battery cell assembly includes electrode lead terminals.

[0047] The battery device further comprises:

[0048] At least one connector, used for introducing and extracting electrical energy to and from the battery cell assembly, the connector being located outside the accommodating cavity;

[0049] at least one current busbar connected between the electrode lead-out terminal and the connector;

[0050] The current collector is provided in the through-hole, one end of the current collector is connected to the electrode lead-out end in the accommodating cavity, and the other end is connected to the connector outside the accommodating cavity.

[0051] In some embodiments, the electrode lead-out terminal includes a positive electrode lead-out terminal and a negative electrode lead-out terminal.

[0052] The connector includes a positive terminal connector and a negative terminal connector,

[0053] There are multiple busbars, including a busbar for the positive electrode and a busbar for the negative electrode. The busbar for the positive electrode is connected between the positive electrode lead-out terminal and the positive terminal connector, and the busbar for the negative electrode is connected between the negative electrode lead-out terminal and the negative terminal connector.

[0054] Since both the positive terminal connector and the negative terminal connector are arranged outside the accommodating cavity, compared with the case where only one connector is arranged outside the accommodating cavity, the grouping efficiency of the battery cell assembly can be further improved, and the volume energy density of the battery device can be increased; moreover, the connection reliability and assembly efficiency of the battery device can be further improved.

[0055] Because the positive and negative lead terminals of the battery cell assembly are led to the outside of the battery case through the positive and negative current collectors, respectively, the high-voltage connection terminals and connectors can be installed outside the battery case, eliminating the need for transfer installation inside the battery case (i.e., the accommodating cavity) as previously required. This reduces the number of components and the space occupied within the battery case, thereby improving the assembly efficiency of the battery assembly and thereby increasing the volumetric energy density of the battery assembly. Furthermore, because the current collectors can be directly connected to the positive and negative lead terminals of the battery cell assembly without intermediary components, not only does this reduce the number of components, material costs, and production costs, but it also reduces the connection resistance between the lead terminals and the external high-voltage connection terminals, improving current handling capacity and mitigating overcurrent heating. It also reduces the risk of poor connection of the transfer components and improves connection reliability. Furthermore, because the battery case has a through-hole through which the second section of the current collector is inserted, the high-voltage connection terminals can be easily led out of the case through the collector.

[0056] In some embodiments, the busbar includes a first section, a second section, and a third section connected in sequence, wherein the first section is connected to the electrode lead-out terminal and is located in the accommodating cavity, the third section is connected to the connector and is located outside the accommodating cavity, and the second section is provided through the busbar through-hole.

[0057] The third section of the current collector is bent relative to the second section and extends along the wall surface of the side wall.

[0058] Therefore, the third section can be arranged close to the side wall, and the third section and the battery box can be arranged closely, reducing the overall size of the battery device.

[0059] In some embodiments, there are multiple busbars, and the multiple busbars include the busbar for the positive electrode and the busbar for the negative electrode.

[0060] The third section of one of the collector for the positive electrode and the collector for the negative electrode is bent relative to the second section and extends along the wall surface of the side wall, and the third section of the other collector is bent relative to the second section and extends along the extension direction of the wall surface of the side wall toward a direction away from the side wall.

[0061] In some embodiments, the plurality of box walls include a first wall, a second wall, and a plurality of side walls, wherein the first wall and the second wall are arranged opposite to each other along a first direction, a first end of each side wall along the first direction is connected to the first wall, and a second end of each side wall along the second direction is connected to the second wall;

[0062] The plurality of side walls include a first side wall and a second side wall arranged opposite to each other along a second direction, and a third side wall and a fourth side wall arranged opposite to each other along a third direction, wherein the first direction, the second direction, and the third direction intersect each other.

[0063] The battery box includes a bottom plate, a first end plate, a second end plate, a first side plate, a second side plate and a cover.

[0064] The cover body is formed as the first wall, the bottom plate is formed as the second wall, and the bottom plate has the heat exchange medium flow channel built therein.

[0065] The first end plate and the second end plate constitute the first side wall and the second side wall respectively.

[0066] The first side plate and the second side plate constitute the third side wall and the fourth side wall respectively.

[0067] The battery cell assembly is supported on the bottom plate, and the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with the battery cell assembly.

[0068] Since the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with the battery cell assembly, the overall grouping efficiency and volume energy density of the battery device can be greatly improved; moreover, since the bottom plate has a built-in heat exchange medium flow channel, the bottom plate has the functions of both supporting the battery cell assembly and performing thermal management, which is beneficial to reducing the number of components, reducing the weight of the battery device, and further improving the energy density of the battery device.

[0069] In some embodiments, at least one of the first side panel and the second side panel is configured to include a side panel body portion and a side panel flange portion.

[0070] The side plate main body is configured as a plate extending along the first direction, and the side plate main body is in contact with the battery cell assembly.

[0071] The side plate flange portion is connected to one end of the side plate main body portion along the first direction, and the side plate flange portion is located on a side of the bottom plate away from the cover body along the first direction and is connected to the bottom plate.

[0072] Since the side panel has a side panel flange portion, the side panel flange portion is connected to one end of the side panel main body portion along the first direction, and the side panel flange portion is located on the side of the bottom plate away from the cover body along the first direction and is connected to the bottom plate, therefore, the side panel flange portion can play a role in supporting the bottom plate; in addition, since the side panel is directly used as part of the battery box body, the frame is omitted, which is conducive to simplifying the structure of the battery device and improving the overall grouping efficiency and energy density.

[0073] In some embodiments, the battery cell assembly includes a plurality of battery cells arranged along a second direction, the battery cells including a housing, the housing defining a housing space through connected housing walls, a large housing wall among the housing walls being perpendicular to the second direction, wherein the large housing wall is the housing wall with the largest area among the housing walls.

[0074] The battery device further comprises at least one restraining member,

[0075] The restraint member includes a restraint member main body and a restraint member connecting part. The restraint member connecting parts are located at both ends of the restraint member main body and are both connected to the restraint member main body. The restraint member connecting parts are connected to the first end plate and the second end plate.

[0076] Since the restraint connection parts are located at both ends of the restraint main body and are both connected to the restraint main body, the restraint connection parts are connected to the first end plate and the second end plate. Therefore, the restraint can restrain the first end plate, the second end plate and the battery cells therebetween along the second direction. Moreover, the second direction is perpendicular to the direction of the large-surface shell wall and is consistent with the expansion direction of the battery cells. Therefore, the restraint can resist the expansion force of the battery cells, improve the shape stability and load-bearing reliability of the battery box, and thereby improve the reliability of the battery device.

[0077] In some embodiments, the restraining member is located outside the accommodating cavity.

[0078] As a result, the space in the accommodating cavity for arranging the restraining member can be further reduced, and the overall grouping efficiency and energy density of the battery device can be further improved.

[0079] In some embodiments, a seal is provided between the cover and the first end plate, the second end plate, the first side plate, and the second side plate, and the seal is made of an adhesive.

[0080] As a result, the cover body and the first end plate, the second end plate, the first side plate and the second side plate can be well connected and sealed by adhesive, which is beneficial to improving the connection reliability and sealing between the cover body and the first end plate, the second end plate, the first side plate and the second side plate.

[0081] In some embodiments, the cover includes a cover body and a plurality of press ribs extending along the second direction, wherein the press ribs are connected to a side of the cover body facing the battery cell assembly.

[0082] The plurality of press rubber ribs include a first press rubber rib and a second press rubber rib, a first gap is formed between the first press rubber rib and the first side plate, and a second gap is formed between the second press rubber rib and the second side plate.

[0083] The adhesive is present in the first gap and the second gap, and surfaces of the first and second press ribs facing the battery cell assembly in the first direction are bonded to surfaces of the battery cell assembly facing the cover in the first direction through the adhesive.

[0084] Since the surfaces of the first and second press glue ribs facing the battery cell assembly along the first direction are bonded to the surface of the battery cell assembly facing the cover body along the first direction by adhesive, the connection reliability of the cover body can be improved and it is beneficial to suppress the vibration of the cover body; in addition, since there is a first gap between the first press glue rib and the first side plate, and a second gap between the second press glue rib and the second side plate, and there is adhesive in the first gap and the second gap, the interface extending along the first direction can be sealed by the adhesive, reducing the risk of water vapor and the like penetrating into the battery cell assembly along the first side plate and the second side plate and causing poor electrical connection; moreover, the above-mentioned sealing structure can be achieved by squeezing the adhesive arranged on the top surface of the battery cell assembly by the first and second press glue ribs so that the adhesive flows into the first gap and the second gap. This is not only simple to operate, but also can reliably block water vapor from the battery cell assembly side.

[0085] In some embodiments, the cover further includes a first shielding flange and a second shielding flange connected to the cover body.

[0086] A portion of the first shielding flange blocks the first gap along the first direction, and another portion is folded and located on a side of the first side panel facing away from the accommodating cavity along the third direction. The first shielding flange and the first press rib form a first slot, and a portion of the first side panel is inserted into the first slot.

[0087] A portion of the second shielding flange blocks the second gap along the first direction, and another portion is folded and located on the side of the second side panel away from the accommodating cavity along the third direction. The second shielding flange and the second glue rib form a second slot, and a portion of the second side panel is inserted into the second slot.

[0088] Since the first shielding flange and the first pressed rubber rib form a first slot, a portion of the first side panel is inserted into the first slot, and the second shielding flange and the second pressed rubber rib form a second slot, a portion of the second side panel is inserted into the second slot, which can play a positioning role between the cover body and the first side panel and the second side panel, and is beneficial to improving the assembly efficiency and assembly accuracy of the battery box.

[0089] In this way, the first gap and the second gap can be further shielded by the first shielding flange and the second shielding flange, further reducing the risk of water seeping into the battery box from the gap between the first side plate, the second side plate and the cover body and causing poor electrical connection.

[0090] A second aspect of an embodiment of the present application provides a battery cluster, which includes the plurality of battery devices provided by the first aspect, and the plurality of battery devices are electrically connected to each other.

[0091] This makes it possible to provide higher energy.

[0092] In some embodiments, the plurality of battery devices include a first battery device, a second battery device, and a battery management system connection harness, wherein the battery management system connection harness is at least used to electrically connect the battery management system of the first battery device with the battery management system of the second battery device.

[0093] Therefore, it is possible to directly connect to the battery management system by using the battery management system connection harness to realize the cascade connection of the communication harness between battery devices, or to realize the communication connection between the battery device and a higher control unit such as the main control box.

[0094] A third aspect of the embodiments of the present application provides an electrical device, which includes at least one of the battery devices described above, or the battery cluster described above.

[0095] Since the overall grouping efficiency and volume energy density of the battery device are improved, it is beneficial to improve the endurance of the electrical device or reduce the space occupied by the battery device in the electrical device.

[0096] A fourth aspect of the embodiments of the present application provides an energy storage device, which includes at least one of the battery devices described above, or the battery cluster described above.

[0097] Since the overall grouping efficiency and volume energy density of the battery device are improved, it is beneficial to increase the total energy stored in the energy storage device, or reduce the volume and / or weight of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0098] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0099] Figure 2 A schematic structural diagram of a battery device provided in some embodiments of the present application;

[0100] Figure 3 for Figure 2 A perspective exploded schematic diagram of the battery device shown;

[0101] Figure 4 for Figure 2 A1 region enlarged schematic diagram;

[0102] Figure 5 A schematic diagram of the structure of a restraining member provided in some embodiments of the present application;

[0103] Figure 6 A schematic structural diagram of a third side wall provided in some embodiments of the present application;

[0104] Figure 7 A schematic structural diagram of a battery device provided in some other embodiments of the present application;

[0105] Figure 8 for Figure 7 Schematic diagram of CC cross section;

[0106] Figure 9 for Figure 8 Schematic diagram of the enlarged structure of the C1 region;

[0107] Figure 10 for Figure 8 Schematic diagram of the enlarged structure of the C2 region;

[0108] Figure 11 The battery device provided in some embodiments of the present application omits the cover structure diagram;

[0109] Figure 12 for Figure 11 Schematic diagram of the enlarged structure of the D1 region;

[0110] Figure 13 A schematic structural diagram of a busbar provided in some embodiments of the present application;

[0111] Figure 14 The battery device provided in some other embodiments of the present application omits the cover structure diagram;

[0112] Figure 15 for Figure 14 Schematic diagram of the enlarged structure of the E1 region;

[0113] Figure 16 A schematic diagram of the connection structure between the sampling component and the battery management system connection module provided in some embodiments of the present application;

[0114] Figure 17 for Figure 16 Schematic diagram of the enlarged structure of the H1 region;

[0115] Figure 18 A schematic exploded perspective view of a battery cell provided in some embodiments of the present application;

[0116] Figure 19 A schematic diagram of the structure of a battery cluster provided in some embodiments of the present application;

[0117] Figure 20 This is a schematic diagram of the structure of a charging network in some embodiments of the present application;

[0118] Figure 21 A schematic diagram of the structure of an energy storage system in some embodiments of the present application;

[0119] Figure 22 Schematic diagram of the structure of the energy storage device in some embodiments of the present application.

[0120] Description of Reference Numerals

[0121] 10. Battery cell assembly; 11. Battery cell; 111. Electrode terminal; 112. Housing; 1121. Large housing wall; 113. Pressure relief mechanism; 114. Electrode assembly; 115. Accommodation space; 20. Box assembly; 21. Cover; 211. Cover body; 212. Pressed rubber rib; 2121. First pressed rubber rib; 2122. Second pressed rubber rib; 213. First shielding flange; 214. Second shielding flange; 22. Second wall; 23. Side wall; 231. First side wall; 232. Second side wall; 233. Third side wall; 2331. Side panel body; 2332. Side panel flange; 2333. Raised portion; 234. Fourth side wall; 24. First gap; 25. Second gap; 26. Sealing member; 27. Through-hole; 30. Tie member; 31. Tie member body; 32. Tie member connection portion; 40. Battery management system; 41. Mounting shell; 411. First shell ; 412, second housing; 42, integrated circuit board; 43, sealing ring; 50, sampling assembly; 51, sampling component; 511, voltage sampling harness; 512, temperature sampling harness; 513, temperature sensor; 52, sampling connector; 521, first connecting section; 522, second connecting section; 523, third connecting section; 53, harness isolation plate; 54, connecting bar; 60, battery management system connection module; 70, busbar; 71, first Section 1; 72, section 2; 73, section 3; 74, fuse; 80, connector; 100, battery device; 200, controller; 300, motor; 400, energy storage device; 410, energy storage box; 500, charging pile; 600, energy storage converter; 1000, vehicle; 2000, battery cluster; 2100, battery management system connection harness; 3000, charging network; 4000, energy storage system; 5000, power generation device. DETAILED DESCRIPTION

[0122] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0123] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0124] In the description of the embodiments of this application, the technical terms "first," "second," "third," "fourth," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise explicitly and specifically defined.

[0125] Mention of "embodiment" in this document means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0126] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0127] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0128] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0129] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0130] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "projection" refers to the orthographic projection of parallel projection lines perpendicular to the projection surface.

[0131] Below, this application is described in detail.

[0132] With the promotion and popularization of the green development concept, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are also increasingly used in energy storage fields.

[0133] In the related art, the battery device includes a battery case, battery cells, a sampling component for collecting voltage and temperature data of the battery cells, and a battery management system. The battery cells, sampling components and battery management system are all located in the battery case. The signal input harness of the battery management system, that is, the sampling harness of the battery device, is connected to the battery management system through a connector inside the battery device. In this way, the battery management system and the sampling harness are connected inside the battery device, which is inconvenient for disassembly, assembly and replacement of the battery management system during after-sales maintenance of the system. Moreover, the battery management system and the sampling harness are connected and installed inside the battery device, which requires a larger installation and operation space, affecting the grouping efficiency of the battery device. In addition, the connection part between the sampling harness and the battery management system is inside the battery device. When a thermal runaway accident occurs in the battery device, there is a possibility that the electrolyte will enter the battery management system and cause a short circuit and ignition, which increases the possibility of thermal runaway fire. Furthermore, the battery management system's signal input and output to the outside of the battery device is accomplished through a wiring harness adapter, meaning that the battery management system and the housing wall must be connected via another wiring harness and connector. A wiring harness connector on the outside of the battery housing is plugged into a connector on the housing wall leading from the inside of the housing to connect the battery management system to the external wiring harness for signal input and output, increasing material costs. Furthermore, wiring harness adapters increase the likelihood of connection failure. Research has shown that at least a portion of the sampling assembly can be positioned outside the battery housing for connection to the battery management system connection module. Thus, the battery management system connection module and the battery management system can be connected outside the battery housing. This not only saves space inside the battery housing and improves the energy density of the battery device, but also allows at least a portion of the sampling assembly to be positioned outside the battery housing, allowing the connection operation between the battery management system connection module and the battery management system to be performed outside the battery housing, further improving the energy density of the battery device. The connection between the battery management system and the sampling component is located outside the battery case, which can reduce the possibility of accidents caused by short circuit and fire in the circuit board. No other components are required for connection between the battery management system and the battery case, which is conducive to reducing components, saving material costs and production costs, and simplifying the structure while improving the overall grouping efficiency and connection reliability of the battery device.

[0134] Based on such a design concept, an embodiment of the present application provides a battery device, which includes a battery case, a battery management system connection module, at least one battery cell assembly and at least one sampling assembly. The battery device includes a battery case, a battery management system connection module, at least one battery cell assembly and at least one sampling assembly. The battery case includes a plurality of case walls, which enclose a sealed accommodating cavity. At least one battery cell assembly is accommodated in the accommodating cavity. The battery management system connection module is located outside the accommodating cavity. The sampling assembly includes a sampling piece and a sampling connector, the sampling piece is located in the accommodating cavity, and the sampling connector is connected between the sampling piece and the battery management system connection module. The battery case has at least one through-hole, the sampling connector is arranged through the through-hole, and is connected to the sampling piece in the accommodating cavity and to the battery management system connection module outside the accommodating cavity.

[0135] The battery device provided in the embodiments of the present application, because the multiple housing walls enclose a sealed accommodating chamber, a sealed space is formed within the battery housing, providing a stable environment for the components (e.g., battery cells) located within the battery housing, protected from external interference. Therefore, the battery device can be assembled into an electrical device or energy storage device even without further packaging like a battery module. By connecting the sampling connector to the sampling component within the accommodating chamber and to the battery management system connection module outside the accommodating chamber, the battery management system and components such as the battery management system connection module can be installed outside the battery housing, eliminating the need for conventional transfer installation within the battery housing (i.e., the accommodating chamber). This reduces the number of components within the battery housing, the space occupied, and the operating space required. This improves the overall assembly efficiency of the battery device, thereby increasing the volumetric energy density of the battery device. Furthermore, the battery management system and the battery housing can be directly connected without intermediary components. This not only reduces the number of components, material costs, and production costs, but also reduces the risk of poor connection of the intermediary components and improves connection reliability. In addition, the battery case is provided with a through-hole so that the sampling connector is passed through the through-hole. While realizing the arrangement of the sampling connector, it can also avoid the situation where the battery case is crushed or damaged by the sampling connector to a certain extent.

[0136] The battery device provided in the embodiments of the present application can be used in, but is not limited to, electrical devices such as vehicles, ships, or aircraft.

[0137] An embodiment of the present application further provides an energy storage device, which includes the battery device of any embodiment of the present application, or the energy storage device includes the battery cluster of any embodiment of the present application.

[0138] Energy storage devices may include energy storage containers, energy storage cabinets, etc.

[0139] The present application also provides an electrical device including the battery device described above. The electrical device may include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0140] The battery device 100 is described below with reference to the accompanying drawings.

[0141] Please refer to Figure 20 and Figure 22 , Figure 20 This is a schematic diagram of the structure of a charging network 3000 provided in some embodiments of the present application. Figure 22 This is a schematic diagram of the structure of an energy storage device 400 provided in some embodiments of the present application. Embodiments of the present application provide a charging network 3000, which includes charging piles 500, which are used to charge electrical devices. The charging network 3000 may also include an energy storage device 400, which is electrically connected to the charging piles 500 and is used to provide electrical energy to the charging piles 500.

[0142] It should be noted that the charging pile 500 is electrically connected to the battery cells in the energy storage device 400 via a cable, and the battery cells can provide their stored energy to the charging pile 500. The charging pile 500 has a connector that can be connected to an electrical device to replenish energy. The application of the energy storage device 400 in the charging network 3000 can effectively improve the safety of the charging network 3000 and also help increase the flexibility of the charging network 3000 during deployment.

[0143] In a charging network 3000 , there may be one charging pile 500 , and the energy storage device 400 provides power to the one charging pile 500 ; there may also be multiple charging piles 500 , and the energy storage device 400 provides power to multiple charging piles 500 .

[0144] As an example, Figure 20 As shown, the charging network 3000 includes an energy storage device 400 and two charging piles 500 , and one energy storage device 400 provides power to the two charging piles 500 .

[0145] The energy storage device 400 may include a battery device 100 , which is electrically connected to the charging pile 500 so that the battery device 100 provides electrical energy to the charging pile 500 .

[0146] Please refer to Figure 21 and Figure 22 , Figure 21Schematic diagram of the structure of an energy storage system 4000 provided in some embodiments of the present application. Embodiments of the present application provide an energy storage system 4000. The energy storage system 4000 includes an energy storage converter 600, which can be electrically connected to a power generation device 5000 to convert the electric power provided by the power generation device 5000. The energy storage system 4000 may also include an energy storage device 400, which is electrically connected to the energy storage converter 600. The energy storage converter 600 converts the electric energy provided by the power generation device 5000 into the energy storage device 400 for storage.

[0147] The power conversion device is used to connect between the power generation device 5000 and the energy storage device 400. The power generation device 5000 is used to generate electrical energy, and the power generation device 5000 is used to store the generated electrical energy in the energy storage device 400 through the power conversion device. The energy storage system 4000 uses the energy storage device 400 to effectively improve the operational safety of the energy storage system 4000. In a specific implementation, the power generation equipment can specifically be solar panels, hydroelectric power generation equipment, thermal power generation equipment, etc. The specific type of power generation equipment is not limited in this application.

[0148] As an example, Figure 21 As shown, the energy storage system 4000 includes an energy storage device 400 and an energy storage conversion device 600. The two power generation devices 5000 respectively transmit the generated electric energy to the energy storage conversion device 600, and the electric energy is introduced into the energy storage device 400 for storage through the energy storage conversion device 600.

[0149] Please refer to Figure 22 The energy storage device 400 includes an energy storage box 410 , in which the battery device 100 is disposed.

[0150] As an example, the energy storage device 400 may be an energy storage container, an energy storage cabinet, etc.

[0151] As an example, the energy storage device 400 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage power station can store electric energy during low power consumption periods and provide electric energy to relevant users or electrical equipment during peak power consumption periods. The wind energy collected by the wind turbines of the wind power generation system is converted into electric energy and then stored by the energy storage device 400. The solar power generation system can convert solar energy into electric energy, which is then stored by the energy storage device 400 and supplied to users in due time. The mobile power system can supply power to relevant electrical equipment in places where the power grid cannot reach, such as remote mountainous areas, remote wilderness areas, etc. The temporary power supply system can provide power to users when there is insufficient power supply.

[0152] Figure 1A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application.

[0153] A controller 200, a motor 300, and a battery device 100 may be provided inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be provided at the bottom, front, or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but may also be used 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.

[0154] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also 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 .

[0155] Figure 2 This is a schematic diagram of the structure of a battery device 100 provided in some embodiments of the present application. The battery device 100 (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 (Battery Cell Assembly) may include multiple battery cells 11, which are connected in series, parallel, or hybrid via a busbar.

[0156] In some embodiments, a battery cell assembly 10 is typically formed by arranging multiple battery cells 11. For example, the battery cell assembly 10 may be a battery module, which is a single module formed by arranging and securing multiple battery cells 11. For example, a battery module may be formed by bundling multiple battery cells 11 together using cable ties.

[0157] In some embodiments, the battery device 100 may be a battery pack, which includes a battery case and one or more battery cell assemblies 10 , wherein the battery cell assemblies 10 are housed in the battery case.

[0158] As an example, the battery cell assembly 10 may be a battery module, and the battery cell assembly 10 may be housed in a battery box by fixing the battery module in the battery box.

[0159] As an example, the battery cell assembly 10 may also be housed in a battery box by directly fixing the plurality of battery cells 11 to the box.

[0160] In the embodiment of the present application, the battery cell 11 may be a secondary battery. A secondary battery refers to a battery cell 11 that can be continuously used by activating active materials by charging after the battery cell 11 is discharged.

[0161] The battery cell 11 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiment of the present application.

[0162] See also Figure 18 Battery cell 11 generally includes an electrode assembly 114. Electrode assembly 114 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of battery cell 11, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator is placed between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0163] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0164] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0165] In some embodiments, the electrode assembly 114 further includes a separator disposed between the positive electrode and the negative electrode.

[0166] In some embodiments, the separator is a separator. The present invention has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be used.

[0167] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0168] In some embodiments, the battery cell 11 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present invention does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0169] In some embodiments, the electrode assembly 114 is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0170] In some embodiments, the electrode assembly 114 is a laminated structure.

[0171] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0172] As an example, multiple positive electrode sheets may be provided, and the negative electrode sheet is folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0173] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0174] As an example, multiple separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0175] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0176] In some embodiments, the electrode assembly 114 is provided with tabs that can conduct current from the electrode assembly 114. The tabs include a positive tab and a negative tab.

[0177] In some embodiments, the battery cell 11 may include a housing. The housing is used to encapsulate components such as the electrode assembly 114 and the electrolyte. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

[0178] As an example, the battery cell 11 can be a cylindrical battery cell 11, a prismatic battery cell 11, a soft-pack battery cell 11 or a battery cell 11 of other shapes. The prismatic battery cell 11 includes a square-shell battery cell 11, a blade-shaped battery cell 11, and a polygonal battery cell 11. The polygonal battery cell 11 is, for example, a hexagonal battery cell 11, etc. There is no special limitation in the embodiments of the present application.

[0179] In some embodiments, see Figure 18 The housing is provided with a pressure relief mechanism 113 . The pressure relief mechanism 113 is used to release the internal pressure of the battery cell 11 .

[0180] Below, refer to Figures 1 to 18 Some embodiments of the present application are described in detail.

[0181] In the description of the embodiments of this application, for ease of explanation, the direction indicated by arrow X represents the "first direction," the direction indicated by arrow Y represents the "second direction," and the direction indicated by arrow Z represents the "third direction." The first direction X, the second direction Y, and the third direction Z intersect with each other and are not coplanar. In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0182] See also Figures 2 to 18 , an embodiment of the present application provides a battery device 100, which includes a battery case, a battery management system connection module 60, at least one battery cell assembly 10 and at least one sampling assembly 50. The battery case includes a plurality of case walls, which enclose a closed accommodating cavity. At least one battery cell assembly 10 is accommodated in the accommodating cavity. The battery management system connection module 60 is located outside the accommodating cavity. The sampling assembly 50 includes a sampling piece 51 and a sampling connector 52. The sampling piece 51 is located in the accommodating cavity. The sampling connector 52 is connected between the sampling piece 51 and the battery management system connection module 60. The battery case has at least one through-hole 27, and the sampling connector 52 is passed through the through-hole 27. It is connected to the sampling piece 51 in the accommodating cavity and to the battery management system connection module 60 outside the accommodating cavity.

[0183] Exemplarily, the accommodating cavity is not connected to the outside, that is, the accommodating cavity is a closed accommodating cavity.

[0184] Optionally, the number of the battery cell assembly 10 may be one or more.

[0185] The term "multiple" in the embodiments of the present application refers to a number of two or more.

[0186] In some embodiments, as Figures 2 to 7 As shown, each battery cell assembly 10 includes a plurality of battery cells 11 . The battery cells 11 in the battery cell assembly 10 are electrically connected. The battery cells 11 in the battery cell assembly 10 may be connected in parallel or in series.

[0187] In some embodiments, as Figure 18 As shown, the battery cell 11 includes a housing and an electrode assembly 114 located within the housing.

[0188] In some embodiments, an electrode terminal 111 is provided on the shell, and the electrode terminal 111 partially passes through the shell and is electrically connected to the electrode assembly 114 through the tab.

[0189] In some specific embodiments, the electrode terminal 111 is made of a conductive metal material, such as copper or aluminum.

[0190] In some embodiments, as Figures 14 to 16As shown, the battery device 100 includes a connecting bar 54 , and adjacent battery cells 11 are connected via the connecting bar 54 .

[0191] In some specific embodiments, the connecting bar 54 is made of a conductive metal material, such as copper or aluminum.

[0192] It should be noted that the specific structure of the sampling component 50 has various forms.

[0193] In some embodiments, as Figures 14 to 17 As shown, the sampling member 51 includes a sampling line array, which is composed of a plurality of sampling line bundles.

[0194] That is to say, multiple sampling wire bundles are integrated into a sampling line bank.

[0195] Exemplarily, the sampling line array is flat.

[0196] By setting the sampling piece 51 to include a sampling wire row, on the one hand, it is beneficial to manage the routing of the sampling wire harness, while improving the assembly efficiency, it can also improve the messy routing situation. On the other hand, it can reduce the space occupied by the sampling piece 51 in the height direction of the battery box, thereby improving the energy density.

[0197] In some embodiments, as Figures 16 and 17 As shown, the plurality of sampling harnesses include a voltage sampling harness 511 , and the voltage sampling harness 511 is connected to the connecting bar 54 .

[0198] For example, the wire sheath of the voltage sampling harness 511 at one end away from the battery management system connection module 60 can be stripped to expose the wire metal, and the wire metal can be connected to the connecting bar 54 between the battery cells 11 to collect the voltage data of the battery cells 11.

[0199] Exemplarily, the voltage sampling harness 511 is connected to the connecting bar 54 by welding.

[0200] In some embodiments, as Figures 16 and 17 As shown, the multiple sampling harnesses include a temperature sampling harness 512 , and the sampling element 51 further includes a temperature sensor 513 . The temperature sampling harness 512 is connected to the temperature sensor 513 , and the temperature sensor 513 is disposed on the connecting piece 54 .

[0201] The temperature sensor 513 is used to collect temperature data of the battery cell 11 and transmit the temperature data to the battery management system connection module 60 through the temperature sampling harness 512 .

[0202] Exemplarily, the temperature sensor 513 is connected to the connecting bar 54 between the battery cells 11 by means of thermally conductive structural adhesive.

[0203] Exemplarily, the temperature sensor 513 may be an NTC (Negative Temperature Coefficient Sensor) temperature sensor 513 .

[0204] The battery device 100 includes a battery management system (BMS) 40 , and the BMS connection module 60 is connected to the BMS 40 .

[0205] Exemplarily, the battery management system connection module 60 is used to connect to the battery management system 40 .

[0206] By inserting the sampling connector 52 through the through-port 27 and connecting it to the battery management system connection module 60 outside the storage chamber, that is, by also leading the connection end of the sampling assembly 50 for connecting to the battery management system 40 outside the storage chamber, the space occupied by the connection between the sampling assembly 50 and the battery management system 40 within the storage chamber can be correspondingly reduced, thereby improving the overall grouping efficiency of the battery device 100 and thereby increasing the volumetric energy density. In addition, the connection portion between the battery management system connection module 60 and the battery management system 40 can be located outside the storage chamber, which can reduce the possibility of accidents caused by circuit board short circuits and ignitions, thereby improving the reliability of the battery device 100.

[0207] In some embodiments, part of the sampling connector 52 is located inside the battery case, and the other part is located outside the battery case. Therefore, the battery management system 40 and the battery management system connection module 60 can be installed outside the battery case, without having to transfer and install them inside the battery case (i.e., the accommodating cavity) as in the past. That is, there is no need to reserve operating space in the battery case for connecting the battery management system 40 and the battery management system connection module 60, thereby reducing the number of components, occupied space and operating space in the battery case.

[0208] In some embodiments, as Figure 2 and Figure 3 As shown, a plurality of battery cells 11 are arranged along the second direction to form a battery cell assembly 10 .

[0209] In some embodiments, as Figure 2 and Figure 3 As shown, the battery device 100 includes a plurality of battery cell assemblies 10 arranged along a third direction.

[0210] Exemplarily, the battery cell assemblies 10 correspond to the sampling assemblies 50 on a one-to-one basis.

[0211] That is, there are multiple battery cell assemblies 10 and multiple sampling assemblies 50 , and each battery cell assembly 10 is electrically connected to the first connecting section 521 of each sampling assembly 50 .

[0212] In some embodiments, as Figure 14 and Figure 15 As shown, the sampling connector 52 includes a first connecting section 521, a second connecting section 522 and a third connecting section 523 connected in sequence. The first connecting section 521, the second connecting section 522 and the third connecting section 523 can be an integral structure or a separate structure.

[0213] Illustratively, the first connecting segment 521 is located in the accommodating cavity and connected to the sampling member 51 , the third connecting segment 523 is located outside the accommodating cavity, and the second connecting segment 522 is connected between the first connecting segment 521 and the third connecting segment 523 .

[0214] Exemplarily, the third connecting section 523 is connected to the battery management system connecting module 60 , and the second connecting section 522 is disposed through the through-opening 27 .

[0215] For example, the sampling connector 52 and the battery management system connection module 60 may be connected by crimping, welding, or bolts.

[0216] The present application does not impose any special restrictions on the shape, size and specific position of the through-hole 27 , as long as the second connecting section 522 can pass through.

[0217] For example, the shape of the through-opening 27 is adapted to the shape of the second connecting section 522 .

[0218] In a specific embodiment, the through opening 27 is flat.

[0219] In some embodiments, as Figure 14 and Figure 15 As shown, there are multiple through-holes 27 and multiple sampling assemblies 50, and the second connecting section 522 of each sampling assembly 50 is inserted through each through-hole 27. Of course, the second connecting sections 522 of multiple sampling assemblies 50 can also be inserted through the same through-hole 27.

[0220] In some embodiments, a through-hole 27 is formed in the box wall. The through-hole 27 can be close to the end of the box wall or located substantially in the middle of the box wall.

[0221] The battery device 100 provided in the embodiment of the present application has a sealed housing cavity formed by multiple housing walls. Thus, a sealed space is formed within the battery housing, providing a stable environment for components located within the battery housing (e.g., battery cells 11) that is protected from external interference. Therefore, the battery device 100 can be assembled into an electrical device or energy storage device even without further packaging like a battery module. By connecting the sampling connector 52 to the sampling component 51 within the housing cavity and to the battery management system connection module 60 outside the housing cavity, the battery management system 40 and components such as the battery management system connection module 60 can be installed outside the battery housing, eliminating the need for conventional installation within the battery housing (i.e., the housing cavity). This reduces the number of components within the battery housing, the space occupied, and the operating space required. This improves the overall assembly efficiency of the battery device 100, thereby increasing the volumetric energy density of the battery device 100. Furthermore, the battery management system 40 and the battery case can be directly connected without intermediary components. This not only reduces the number of components, material costs, and production costs, but also mitigates the risk of poor connection of intermediary components, thereby improving connection reliability. Furthermore, the battery case is provided with a through-hole 27, through which the sampling connector 52 is inserted. This not only facilitates the placement of the sampling connector 52 but also, to a certain extent, prevents the battery case from crushing or damaging the sampling connector 52.

[0222] In some embodiments, as Figure 11 and Figure 14 As shown, the battery management system 40 is located outside the accommodation cavity.

[0223] This further reduces the number of components and space occupied within the battery case, further improving the overall assembly efficiency of the battery assembly 100 and, consequently, the volumetric energy density of the battery assembly 100. Furthermore, it further facilitates the connection between the battery management system connection module 60 and the battery management system 40. Furthermore, the battery management system 40 can be quickly disassembled, maintained, and replaced without disassembling the battery case, facilitating quick disassembly, maintenance, and replacement of the battery management system 40.

[0224] In other embodiments, the battery management system 40 may be at least partially located within the housing. For example, a connection port is provided on the wall of the housing, and the battery management system connection module 60 may be connected to the battery management system connection module 60 outside the battery housing through the connection port.

[0225] In some embodiments, as Figures 2 to 8As shown, the plurality of box walls include a first wall, a second wall 22, and a plurality of side walls 23. The first wall and the second wall 22 are arranged opposite to each other along a first direction. The first end of each side wall 23 along the first direction is connected to the first wall, and the second end of each side wall 23 along the second direction is connected to the second wall 22. A through-opening 27 is provided between the first end of at least one side wall 23 and the first wall, or between the second end of at least one side wall 23 and the second wall 22, or between the first end of at least one side wall 23 and the first wall and between the second end of at least one side wall 23 and the second wall 22.

[0226] The battery box is shaped like a rectangular parallelepiped for illustration. Of course, the battery box may also be shaped like other regular or irregular shapes.

[0227] In some embodiments, the plurality of side walls 23 include two side walls 23 opposite to each other along the second direction (eg Figure 3 The first side wall 231 and the second side wall 232 shown in FIG. 2 and the two side walls 23 opposite to each other along the third direction (eg Figure 3 The third side wall 233 and the fourth side wall 234 are shown).

[0228] The following description will be made by taking the first side wall 231 as an example.

[0229] Optionally, the first end and the first wall may be directly connected or indirectly connected. For example, the first end and the first wall may be bonded together or connected by external connecting members such as bolts and angle irons.

[0230] Alternatively, the first end of the side wall 23 (eg Figure 2 The upper end shown in FIG) abuts against the side of the first wall along the first direction toward the battery cell 11; the end edge of the first wall may also abut against the first end of the side wall 23, for example, Figure 2 Taking the orientation shown as an example, the front end edge of the first wall abuts against the inner end surface of the first end of the first side wall 231.

[0231] Optionally, the second end and the second wall 22 may be directly or indirectly connected. For example, the second end and the second wall 22 may be bonded together or connected by external connecting members such as bolts and angle irons.

[0232] Alternatively, the second end of the side wall 23 (eg Figure 2 The lower end shown in FIG) abuts against the side of the second wall 22 along the first direction toward the battery cell 11; the end edge of the second wall 22 may also abut against the second end of the side wall 23, for example, Figure 2 Taking the orientation shown as an example, the front end edge of the second wall 22 abuts against the inner end surface of the second end of the first side wall 231 .

[0233] Optionally, the plurality of through openings 27 are all located between the first end and the first wall; the plurality of through openings 27 may also be all located between the second end and the second wall 22; a portion of the plurality of through openings 27 may also be located between the first end and the first wall, and another portion of the through openings 27 may be located between the second end and the second wall 22.

[0234] In some embodiments, the through-hole 27 may be located between the first end and the first wall of any one of the side walls 23 .

[0235] In some embodiments, the through-hole 27 may be located between the second end of any one of the side walls 23 and the second wall 22 .

[0236] Since the through opening 27 is formed by the end of the side wall 23 and the first wall and / or the second wall 22, the sampling connector 52 in which the first connecting section 521 is connected to the sampling member 51 can extend across the side wall 23 and out of the accommodating cavity, and does not occupy the space between the wall surface of the side wall 23 and the battery cell assembly 10. The side wall 23 can be attached to the battery cell assembly 10, which can further improve the overall grouping efficiency of the battery device 100 and further improve the volume energy density.

[0237] In some embodiments, as Figure 11 and Figure 12 As shown, when a through opening 27 is provided between the first end of at least one side wall 23 and the first wall, the first end of at least one side wall 23 has a first notch formed by being partially recessed along the first direction, and the first notch constitutes the through opening 27, and / or the second end of at least one side wall 23 has a second notch formed by being partially recessed along the first direction, and the second notch constitutes the through opening 27.

[0238] Exemplarily, a first end of at least one side wall 23 has a first notch partially recessed along a first direction, and the first notch and the first wall are arranged to form a through opening 27 .

[0239] Taking the first notch formed in the first sidewall 231 as an example, the first notch can be located near the end and / or substantially in the middle of the first sidewall 231 along the third direction. Of course, the first notch can also be formed in other sidewalls 23, which will not be described in detail here.

[0240] In some embodiments, when a through opening 27 is provided between the second end of at least one side wall 23 and the second wall, the second end of at least one side wall 23 has a second notch partially recessed along the first direction, and the second notch and the second wall 22 are arranged to form the through opening 27 .

[0241] Taking the second notch formed on the second sidewall 232 as an example, the second notch can be located near the end and / or substantially in the middle of the second sidewall 232 along the third direction. Of course, other sidewalls 23 can also form second notches, which will not be described in detail here.

[0242] With such a design, the through-hole 27 can be formed in a simple process, and it is also convenient to assemble the sampling connector 52 into the through-hole 27 .

[0243] In some embodiments, the battery case further includes a sealing structure between the first end of at least one side wall 23 and the first wall, and / or, between the second end of at least one side wall 23 and the second wall 22, and the through-hole 27 is formed in the sealing structure.

[0244] The sealing structure is used to seal the gap between the second connecting section 522 and the first end of the side wall 23, and the gap between the second connecting section 522 and the first wall, and / or the sealing structure is used to seal the gap between the second connecting section 522 and the second end of the side wall 23, and the gap between the second connecting section 522 and the second wall 22, thereby sealing the position of the battery case for extending the sampling connector 52, so that the battery case forms a closed space.

[0245] Optionally, the sealing structure may be sealant or sealing rubber.

[0246] In a specific embodiment, the sealing structure is a sealant, thereby reducing the number of parts and saving costs. At the same time, the sealing solution has a simple structure and occupies a small space, which can improve the efficiency of battery pack grouping.

[0247] In some embodiments, the sealing structure is between the first end of the side wall 23 and the first wall.

[0248] In some embodiments, the sealing structure is between the second end of the side wall 23 and the second wall 22 .

[0249] Since the through-opening 27 is formed in the sealing structure, after the second section 72 is passed through the through-opening 27, the sealing structure can seal the through-opening 27, thereby the battery case can be sealed, providing a stable internal environment for the components located inside the battery case (such as the battery cell 11), thereby reducing the probability of the components inside the battery case (such as the battery cell 11) being damaged or destroyed by the influence of the external environment, thereby improving the reliability of the battery device 100.

[0250] In some embodiments, as Figure 11 、 Figure 12 and Figure 18 As shown, the battery cell 11 includes an electrode terminal 111 . Along the first direction, the electrode terminal 111 is close to the first wall, and the through-hole 27 is located between the first end of the side wall 23 and the first wall.

[0251] That is, along the first direction, the electrode terminal 111 is closer to the first wall than to the second wall 22 .

[0252] For example, along the first direction, the through-opening 27 is higher than the top wall of the battery cell 11. Therefore, the battery cell 11 does not need to avoid the sampling assembly 50, so that the battery cell assembly 10 in the battery case can be close to the side wall 23, which can improve the overall grouping efficiency of the battery device 100 and thus improve the volume energy density of the battery device 100.

[0253] It should be noted that the top wall of the battery cell 11 mentioned here refers to the top wall of the housing 112 .

[0254] Thus, the third connecting section 523 of the sampling connecting piece 52 can be arranged on the same side of the side wall 23, which is convenient for installation; moreover, the path of the sampling connecting piece 52 extending from the inside of the accommodating cavity to the outside of the accommodating cavity can be shortened, and the space occupied by the sampling connecting piece 52 extending in the accommodating cavity can be reduced; and, since the sampling connecting piece 52 is shorter, the weight can be reduced accordingly, thereby reducing material costs.

[0255] Illustratively, the dimension of the through opening 27 in the first direction is greater than or equal to the dimension of the second connecting section 522 in the first direction, which can prevent the battery box from being crushed or damaged to a certain extent.

[0256] Illustratively, the dimension of the through opening 27 in the third direction is greater than or equal to the dimension of the second connecting section 522 in the third direction, which can prevent the battery box from being crushed or damaging the second connecting section 522 to a certain extent.

[0257] In some embodiments, as Figures 11 to 14 As shown, the battery management system 40 includes a mounting shell 41 and an integrated circuit board 42 . The integrated circuit board 42 is disposed in the mounting shell 41 . At least a portion of the battery management system connection module 60 extends into the mounting shell 41 and is electrically connected to the integrated circuit board 42 .

[0258] For example, the mounting shell 41 may be fastened, snapped, or glued to the side wall 23 .

[0259] Exemplarily, the mounting shell 41 is connected to a side of the side wall 23 facing away from the accommodating cavity.

[0260] By placing the integrated circuit board 42 in the mounting shell 41 , the mounting shell 41 can provide a stable environment for components such as the integrated circuit board 42 located inside the mounting shell 41 that is free from external environmental interference, thereby improving the connection reliability between the sampling component 50 and the battery management system 40 .

[0261] Exemplarily, the mounting shell 41 is provided with a connection interface, and the battery management system connection module 60 can be plugged into and connected to the connection interface of the battery management system 40 .

[0262] In some embodiments, as Figures 11 to 14 As shown, the mounting housing 41 includes a first housing 411 and a second housing 412. The edge of the first housing 411 has a first sealing surface, and the edge of the second housing 412 has a second sealing surface. The battery management system 40 also includes a sealing ring 43. The first housing 411 and the second housing 412 are connected, so that the sealing ring 43 is sandwiched between the first and second sealing surfaces.

[0263] Exemplarily, the sealing ring 43 may be sealant or sealing rubber.

[0264] Exemplarily, the first shell 411 and the second shell 412 may be fastened, snap-fitted, or glued together.

[0265] Exemplarily, the interior of the mounting shell 41 has an installation space, a sealing ring 43 is arranged on the peripheral side of the installation space, and components such as the integrated circuit board 42 are arranged in the installation space and sealed by the sealing ring 43 .

[0266] The components and connection interfaces inside the mounting shell 41 can be safely protected, preventing people from accidentally touching live parts such as the integrated circuit board 42 , and preventing dust, water, etc. from entering the battery management system 40 .

[0267] Since the sealing ring 43 is sandwiched between the first sealing surface and the second sealing surface, the sealing member 26 can seal the gap between the first sealing surface and the second sealing surface.

[0268] Therefore, a sealed installation space can be formed inside the installation shell 41 , which can provide a stable environment for components (such as the integrated circuit board 42 ) located inside the installation shell 41 that is free from external interference, thereby improving the reliability of the battery device 100 .

[0269] In some embodiments, as Figures 11 to 14 As shown, at least a portion of the sampling connector 52 extends into the mounting shell 41 , and a sealing ring 43 is provided on both the side of the sampling connector 52 close to the first shell 411 and the side close to the second shell 412 .

[0270] Specifically, at least a portion of the third connecting section 523 extends into the mounting shell 41 , and a sealing ring 43 is provided on both a side of the third connecting section 523 close to the first shell 411 and a side close to the second shell 412 .

[0271] During assembly, the first shell 411 can be first connected to the side wall 23, and the integrated circuit board 42 and other components can be set in the first shell 411. After the battery management system connection module 60 is electrically connected to the integrated circuit board 42, the second shell 412 is docked with the first shell 411 so that the third connecting section 523 is clamped between the first shell 411 and the second shell 412, and is clamped between the first sealing surface and the second sealing surface through the sealing ring 43 to achieve a sealed connection between the sampling component 50 and the battery management system 40.

[0272] Since sealing rings 43 are provided on both the side of the third connecting section 523 close to the first shell 411 and the side close to the second shell 412, after the third connecting section 523 is extended into the mounting shell 41, the sealing rings 43 on both sides of the third connecting section 523 along the thickness direction can seal the gap between the third connecting section 523 and the mounting shell 41, which can further provide a stable environment for the components (such as the integrated circuit board 42) located inside the mounting shell 41 that is free from interference from the external environment, thereby further improving the reliability of the battery device 100.

[0273] Exemplarily, the sampling assembly 50 includes a sampling piece 51 , a sampling connector 52 , a connecting bar 54 and a harness isolation plate 53 , and the sampling piece 51 , the sampling connector 52 , the connecting bar 54 and the harness isolation plate 53 are integrated into the sampling assembly 50 .

[0274] Therefore, the sampling assembly 50 can be pre-assembled to form a pre-assembled component, which is beneficial to improving the overall assembly efficiency of the battery device 100.

[0275] In some embodiments, as Figures 11 to 14 As shown, the third connecting section 523 of the sampling connecting piece 52 is bent relative to the second connecting section 522 and extends along the wall surface of the side wall 23 .

[0276] In some embodiments, the extending directions of the third connecting segments 523 in the plurality of sampling connecting members 52 may be the same or different.

[0277] In some embodiments, the through-hole 27 is located between the first sidewall 231 and the first wall. The third connecting segment 523 of the sampling connector 52 is bent relative to the second connecting segment 522, extending in the first direction away from the first wall. Furthermore, the third connecting segment 523 is closely attached to the first sidewall 231. Of course, the through-hole 27 can also be located between other sidewalls 23 and the first wall and / or the second wall 22, which will not be described in detail here.

[0278] Therefore, the third connecting section 523 of the sampling connector 52 can be disposed close to the side wall 23 , and the third connecting section 523 of the sampling connector 52 and the battery box can be arranged closely, thereby reducing the overall size of the battery device 100 .

[0279] In some embodiments, as Figures 11 to 14 As shown, there are multiple sampling connectors 52, and the third connecting sections 523 of some sampling connectors 52 extend along the first direction, while the third connecting sections 523 of other sampling connectors 52 first extend along the first direction and then extend along the second direction, wherein the first direction and the second direction intersect each other.

[0280] For example, the battery management system 40 is located near the middle of the first sidewall 231 along the third direction. Therefore, the third connecting segment 523 of the sampling connector 52 that is relatively close to the middle position along the third direction can be connected to the battery management system 40 by extending along the first direction. Furthermore, the third connecting segment 523 of the sampling connector 52 that is relatively far from the middle position along the third direction can be connected to the battery management system 40 by first extending along the first direction and then extending along the second direction.

[0281] Illustratively, the third connecting section 523 of the sampling connecting member 52 extends along the first direction to a position close to the middle of the first side wall 231 in the third direction, and then extends along the second direction.

[0282] Of course, the through opening 27 may also be located between other side walls 23 and the first wall and / or the second wall 22 , which will not be described in detail here.

[0283] Therefore, the third connection segments 523 of some sampling connectors 52 and the third connection segments 523 of another part of sampling connectors 52 extend in different directions, which facilitates the connection between different sampling connectors 52 and the battery management system 40 .

[0284] In some embodiments, as Figures 3 to 8 As shown, the multiple housing walls include a first wall, a second wall 22, and multiple side walls 23. The first wall and the second wall 22 are arranged opposite each other along a first direction. The first end of each side wall 23 along the first direction is connected to the first wall, and the second end of each side wall 23 along the second direction is connected to the second wall 22. The multiple side walls 23 include a first side wall 231 and a second side wall 232 arranged opposite each other along the second direction, and a third side wall 233 and a fourth side wall 234 arranged opposite each other along a third direction. The first, second, and third directions intersect with each other. The battery housing includes a bottom plate, a first end plate, a second end plate, a first side plate, a second side plate, and a cover 21. The cover 21 constitutes the first wall, the bottom plate constitutes the second wall 22, and the bottom plate has a built-in heat exchange medium flow channel. The first and second end plates constitute the first and second side walls 231 and 232, respectively. The first and second side plates constitute the third and fourth side walls 233 and 234, respectively. The battery cell assembly 10 is supported on the bottom plate. The first end plate, the second end plate, the first side plate, and the second side plate are all in contact with the battery cell assembly 10 .

[0285] Since the cover body 21 is constituted as the first wall, the bottom plate is constituted as the second wall 22, the first end plate and the second end plate are respectively constituted as the first side wall 231 and the second side wall 232, and the first side plate and the second side plate are respectively constituted as the third side wall 233 and the fourth side wall 234, that is to say, the side wall 23, the first wall and the second wall 22 of the battery box are all plate-like structures. This structure is simple, forming a simple battery box.

[0286] Since the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with the battery cell assembly 10, the overall grouping efficiency and volume energy density of the battery device 100 can be greatly improved; moreover, since the bottom plate has a built-in heat exchange medium flow channel, the bottom plate has the functions of both supporting the battery cell assembly 10 and performing thermal management, which is beneficial to reducing the number of components, reducing the weight of the battery device 100, and further improving the energy density of the battery device 100.

[0287] In some embodiments, as Figure 6 As shown, at least one of the first side plate and the second side plate is configured to have a side plate main body 2331 and a side plate flange portion 2332, the side plate main body 2331 is configured to be a plate extending along the first direction, the side plate main body 2331 is in contact with the battery cell assembly 10, the side plate flange portion 2332 is connected to one end of the side plate main body 2331 along the first direction, and the side plate flange portion 2332 is located on the side of the bottom plate away from the cover body 21 along the first direction and is connected to the bottom plate.

[0288] The first side panel may be configured to have a side panel main body 2331 and a side panel flange 2332, the second side panel may be configured to have a side panel main body 2331 and a side panel flange 2332, or both the first side panel and the second side panel may be configured to have a side panel main body 2331 and a side panel flange 2332.

[0289] In some embodiments, the side panel flange portion 2332 is bent relative to the side panel main body portion 2331 .

[0290] In some embodiments, the side panel main body 2331 and the side panel flange portion 2332 can be directly connected or indirectly connected. In a specific embodiment, the side panel main body 2331 and the side panel flange portion 2332 are integrally formed.

[0291] In some embodiments, side plate main bodies 2331 are provided on both sides of the battery module along the third direction.

[0292] In some embodiments, both ends along the third direction of the surface of the bottom plate on the side facing away from the cover body 21 along the first direction are in contact with different side plate flange portions 2332 .

[0293] In some embodiments, the side panel main body 2331 of the first side panel and the side panel main body 2331 of the second side panel are respectively located on opposite sides of the bottom plate along the third direction, and the side panel flange portion 2332 of the first side panel and the side panel flange portion 2332 of the second side panel are both located on the side of the bottom plate away from the cover body 21 along the first direction and are connected to the bottom plate.

[0294] In some embodiments, as Figure 3 and Figure 6 As shown, the side of the side panel flange 2332 facing away from the accommodating cavity along the first direction is configured to have a raised portion 2333, which is raised away from the accommodating cavity. Thus, the raised portion 2333 can strengthen the strength of the side panel flange 2332, thereby increasing the support force of the side panel flange 2332 on the bottom plate.

[0295] In some embodiments, the raised portion 2333 may be formed by thickening a portion of the side panel flange portion 2332 .

[0296] In some embodiments, the raised portion 2333 may be formed by a portion of the side panel flange portion 2332 being recessed along the first direction away from the cover body 21 .

[0297] In some embodiments, the protrusion 2333 extends along the second direction.

[0298] In some embodiments, the number of the protrusions 2333 may be one or more. The multiple protrusions may be spaced apart along the second direction or the third direction.

[0299] In some embodiments, the surface of the protrusion 2333 that faces away from the accommodating cavity along the first direction is a flat surface.

[0300] Since the side panel has a side panel flange portion 2332, the side panel flange portion 2332 is connected to one end of the side panel main body portion 2331 along the first direction, and the side panel flange portion 2332 is located on the side of the bottom plate away from the cover body 21 along the first direction and is connected to the bottom plate, therefore, the side panel flange portion 2332 can play a role in supporting the bottom plate; in addition, since the side panel is directly used as part of the battery box body, the frame is omitted, which is conducive to simplifying the structure of the battery device 100 and improving the overall grouping efficiency and energy density.

[0301] In some embodiments, see Figures 2 to 5 ,as well as Figure 18The battery cell assembly 10 includes a plurality of battery cells 11 arranged along the second direction. The battery cell 11 includes a shell 112, and the shell 112 defines a receiving space 115 through a connected shell wall. The large shell wall 1121 in the shell wall is perpendicular to the second direction, wherein the large shell wall 1121 is the shell wall with the largest area. The battery device 100 also includes at least one restraint 30, and the restraint 30 includes a restraint main body 31 and a restraint connection part 32. The restraint connection part 32 is located at both ends of the restraint main body 31 and is connected to the restraint main body 31. The restraint connection part 32 is connected to the first end plate and the second end plate.

[0302] Exemplarily, the material of the restraining member 30 is high-strength spring steel or carbon steel.

[0303] For example, the number of the restraints 30 may be one or more.

[0304] For example, the restraint 30 may extend along the second direction so that the restraint connection portion 32 of the restraint 30 is connected to the first end plate and the second end plate.

[0305] For example, a plurality of tie members 30 may be arranged along the third direction.

[0306] For example, see Figures 2 to 5 The arrangement direction of the plurality of restraints 30 may be substantially the same as the arrangement direction of the plurality of battery cell assemblies 10 .

[0307] For example, the restraint body 31 may be located on a side of the cover 21 away from the battery cell assembly 10 along the first direction; the restraint body 31 may also be located inside the cover 21 .

[0308] For example, the restraint member body 31 may be located on a side of the bottom plate that is away from the battery cell assembly 10 along the first direction; the restraint member body 31 may also be located inside the bottom plate.

[0309] For example, the main body of the restraint member 30 and the restraint member connecting portion 32 may be an integral piece or a separate structure.

[0310] For example, the material of the main body of the restraint member 30 and the material of the restraint member connecting portion 32 may be the same or different.

[0311] Since the restraint connection part 32 is located at both ends of the restraint main body 31 and is connected to the restraint main body 31, the restraint connection part 32 is connected to the first end plate and the second end plate. Therefore, the restraint 30 can restrain the first end plate, the second end plate and the battery cell 11 therebetween along the second direction. Moreover, the second direction is perpendicular to the direction of the large-surface shell wall 1121 and is consistent with the expansion direction of the battery cell 11. Therefore, the restraint 30 can resist the expansion force of the battery cell 11, improve the shape stability and load-bearing reliability of the battery box, and thereby improve the reliability of the battery device 100.

[0312] In some embodiments, see Figures 2 to 3 , the restraining member 30 is located outside the accommodating cavity.

[0313] Exemplarily, the restraining member 30 may be disposed outside the battery box; the restraining member 30 may also be embedded in the battery box, for example, the restraining member 30 is embedded in the bottom plate and / or the cover 21 .

[0314] As a result, the space in the accommodation cavity for arranging the restraining member 30 can be further reduced, and the overall assembly efficiency and energy density of the battery device 100 can be further improved.

[0315] In some embodiments, a sealing member 26 is provided between the cover 21 and the first end plate, the second end plate, the first side plate, and the second side plate. The sealing member 26 is made of an adhesive.

[0316] That is, the connection between the cover 21 and the side walls 23 is filled with the sealing member 26 .

[0317] Exemplarily, the cover 21 is configured as an insulating cover 21 .

[0318] For example, the outer surface of the cover 21 is insulated or the entire cover 21 is made of an insulating material.

[0319] In some embodiments, the cover 21 is made of a resin material, or a fiber-reinforced resin composite material, or a metal material with an insulating layer.

[0320] Exemplarily, a seal 26 is provided between the bottom plate and the first end plate, the second end plate, the first side plate, and the second side plate.

[0321] Exemplarily, the joints between the plurality of side walls 23 are filled with sealing members 26 .

[0322] As a result, the cover body 21 and the first end plate, the second end plate, the first side plate and the second side plate can be well connected and sealed by the adhesive, which is beneficial to improving the connection reliability and sealing between the cover body 21 and the first end plate, the second end plate, the first side plate and the second side plate.

[0323] Illustratively, at least one side wall 23 is higher than the top wall of the battery cell assembly 10 . This helps to improve the protection of the battery box to the battery cell assembly 10 and facilitates the application of adhesive to the top wall of the battery cell assembly 10 near the side wall 23 .

[0324] In some embodiments, see Figures 7 to 10 The cover 21 includes a cover body 211 and a plurality of adhesive ribs 212 extending along the second direction. The adhesive ribs 212 are connected to the side of the cover body 211 facing the battery cell assembly 10. The plurality of adhesive ribs 212 include a first adhesive rib 2121 and a second adhesive rib 2122. A first gap 24 is defined between the first adhesive rib 2121 and the first side panel, and a second gap 25 is defined between the second adhesive rib 2122 and the second side panel. Adhesive is present in the first gap 24 and the second gap 25. The surfaces of the first adhesive rib 2121 and the second adhesive rib 2122 facing the battery cell assembly 10 in the first direction are bonded to the surface of the battery cell assembly 10 facing the cover 21 in the first direction via adhesive.

[0325] The press bead 212 is connected to a side of the cover body 211 facing the battery cell assembly 10 . That is, in the first direction, the press bead 212 is located between the cover body 211 and the battery cell assembly 10 .

[0326] Here, the rib 212 and the cover body 211 can be an integrated structure, which helps reduce parts and improve the assembly efficiency of the battery device 100. Of course, the rib 212 and the cover body 211 can also be a separate structure, which facilitates the molding of the cover 21.

[0327] The surface of the pressed glue rib 212 facing the battery cell assembly 10 along the first direction is bonded to the surface of the battery cell assembly 10 facing the cover body 21 along the first direction by an adhesive. That is, the pressed glue rib 212 is bonded to the top wall of the battery cell assembly 10 by an adhesive. In this way, the cover body 21 and the battery cell assembly 10 can be connected as a whole, and it is beneficial to suppress the vibration of the cover body 21. While improving the connection reliability of the cover body 21, it is also beneficial to improve the overall structural strength and stability of the battery device 100.

[0328] There is a first gap 24 between the first glue rib 2121 and the first side panel, which means that a first gap 24 is defined between the first glue rib 2121 and the surfaces opposite to the first side panel, that is, there is a first gap 24 between the surface of the first side panel facing the accommodating cavity and the surface of the first glue rib 2121 facing the first side panel.

[0329] There is a second gap 25 between the second glue rib 2122 and the second side panel, which means that a second gap 25 is defined between the second glue rib 2122 and the surface opposite to the second side panel, that is, there is a second gap 25 between the surface of the second side panel facing the accommodating cavity and the surface of the second glue rib 2122 facing the second side panel.

[0330] Since the surfaces of the first and second press glue ribs 2121 and 2122 facing the battery cell assembly 10 in the first direction are bonded to the surfaces of the battery cell assembly 10 facing the cover 21 in the first direction by adhesive, the connection reliability of the cover 21 can be improved and the vibration of the cover 21 can be suppressed. In addition, since there is a first gap 24 between the first press glue rib 2121 and the first side plate, and a second gap 25 between the second press glue rib 2122 and the second side plate, there is a gap between the first gap 24 and the second gap 25. Adhesive, therefore, the interface extending along the first direction can be sealed by the adhesive, reducing the risk of water vapor and the like penetrating into the battery cell assembly 10 along the first side plate and the second side plate and causing poor electrical connection; moreover, the adhesive arranged on the top surface of the battery cell assembly 10 can be squeezed by the first pressing rib 2121 and the second pressing rib 2122 to make the adhesive flow into the first gap 24 and the second gap 25 to realize the above-mentioned sealing structure, which is not only simple to operate but also can reliably block water vapor from the side of the battery cell assembly 10.

[0331] In some embodiments, see Figures 7 to 10 The cover body 21 also includes a first shielding flange 213 and a second shielding flange 214 connected to the cover body 211. A portion of the first shielding flange 213 blocks the first gap 24 along the first direction, and the other portion is folded and located on the side of the first side panel away from the accommodating cavity along the third direction. The first shielding flange 213 and the first glue rib 2121 form a first slot, and a portion of the first side panel is inserted into the first slot. A portion of the second shielding flange 214 blocks the second gap 25 along the first direction, and the other portion is folded and located on the side of the second side panel away from the accommodating cavity along the third direction. The second shielding flange 214 and the second glue rib 2122 form a second slot, and a portion of the second side panel is inserted into the second slot.

[0332] Here, the first shielding flange 213 and / or the second shielding flange 214 can be an integral structure with the cover body 211, which helps reduce the number of parts and thus improves the assembly efficiency of the battery device 100. Of course, the first shielding flange 213 and / or the second shielding flange 214 can also be a separate structure with the cover body 211, which facilitates the molding of the cover 21.

[0333] A portion of the first shielding flange 213 blocks the first gap 24 along the first direction, and another portion is folded over and located on the side of the first side panel away from the accommodating cavity along the third direction. That is, a portion of the first shielding flange 213 is located above the first gap 24, and another portion is folded over and located on the side of the first side panel. In this way, the first shielding flange 213 can block the connection between the cover body 21 and the end face of the first side panel and the side face of the first side panel.

[0334] A portion of the second shielding flange 214 blocks the second gap 25 along the first direction, and another portion is folded over and located on the side of the second side panel away from the accommodating cavity along the third direction. That is, a portion of the second shielding flange 214 is located above the second gap 25, and another portion is folded over and located on the side of the second side panel. In this way, the second shielding flange 214 can block the connection between the cover body 21 and the end face of the second side panel and the side of the second side panel.

[0335] It should be noted that the size of the first shielding flange 213 and / or the second shielding flange 214 in the first direction is not limited.

[0336] Exemplarily, the first shielding flange 213 has a dimension in the first direction larger than the dimension in the first direction of the first glue rib 2121. This further helps to reduce the possibility of dripping water or condensed water entering the first gap 24 through the gap between the cover body 21 and the end face of the first side wall 231, and reduces the possibility of dripping water or condensed water gathering at the glue coating interface.

[0337] Exemplarily, the second shielding flange 214 has a dimension in the first direction larger than the dimension in the first direction of the second glue rib 2122. This further helps to reduce the possibility of dripping water or condensed water entering the second gap 25 through the gap between the cover body 21 and the end face of the second side wall 232, and reduces the possibility of dripping water or condensed water gathering at the glue coating interface.

[0338] The first shielding flange 213 is closer to the edge of the cover body 21 than the first pressing rib 2121 , that is, the first shielding flange 213 is arranged on the outside of the first pressing rib 2121 so that the first shielding flange 213 and the first pressing rib 2121 form a first slot.

[0339] The second shielding flange 214 is closer to the edge of the cover body 21 than the second pressing rib 2122 , that is, the second shielding flange 214 is arranged on the outside of the second pressing rib 2122 so that the second shielding flange 214 and the second pressing rib 2122 form a second slot.

[0340] Since the first shielding flange 213 and the first glue rib 2121 form a first slot, a portion of the first side panel is inserted into the first slot, and the second shielding flange 214 and the second glue rib 2122 form a second slot, a portion of the second side panel is inserted into the second slot, which can play a positioning role between the cover body 21 and the first side panel and the second side panel, which is beneficial to improving the assembly efficiency and assembly accuracy of the battery box.

[0341] In this way, the first and second shielding flanges 213 and 214 can further shield the first and second gaps 24 and 25, further reducing the risk of water seeping into the battery box from the gaps between the first and second side plates and the cover 21, causing poor electrical connection.

[0342] In some embodiments, as Figures 11 to 13 As shown, the battery cell assembly 10 includes electrode lead terminals. The battery device also includes at least one connector 80 and at least one current collector 70. The connector 80 is used to connect and remove electrical energy from the battery cell assembly 10 and is located outside the housing cavity. The current collector is connected between the electrode lead terminals and the connector 80. The current collector 70 is inserted through the current collector opening 27. One end of the current collector 70 is connected to the electrode lead terminals within the housing cavity, and the other end is connected to the connector 80 outside the housing cavity.

[0343] Exemplarily, the electrode lead-out terminal includes a positive lead-out terminal and a negative lead-out terminal, the connector 80 includes a positive terminal connector and a negative terminal connector, the number of busbars 70 is multiple, and the multiple busbars 70 include a busbar 70 for the positive electrode and a busbar 70 for the negative electrode, the busbar 70 for the positive electrode is connected between the positive lead-out terminal and the positive terminal connector, and the busbar 70 for the negative electrode is connected between the negative lead-out terminal and the negative terminal connector.

[0344] Since both the positive terminal connector and the negative terminal connector are arranged outside the accommodating cavity, compared with the case where only one connector 80 is arranged outside the accommodating cavity, the grouping efficiency of the battery cell assembly can be further improved, and the volume energy density of the battery device can be improved; moreover, the connection reliability and assembly efficiency of the battery device can be further improved.

[0345] Exemplarily, the current collector 70 includes a first section 71, a second section 72, and a third section 73, which are connected in sequence. The first section 71 of the positive electrode current collector 70 is located within the accommodating cavity and connected to the positive electrode lead terminal. The first section 71 of the negative electrode current collector 70 is located within the accommodating cavity and connected to the negative electrode lead terminal. Each third section 73 is located outside the accommodating cavity, and each second section 72 is connected between its respective first section 71 and third section 73. The second section 72 of the current collector 70 is disposed through the through-hole 27.

[0346] Exemplarily, the first section 71 , the second section 72 and the third section 73 are an integral structure, and the current collector 70 is formed into the first section 71 , the second section 72 and the third section 73 by stamping or bending.

[0347] The first section 71 , the second section 72 and the third section 73 may be plate-shaped.

[0348] Illustratively, the connector 80 is electrically connected to the third segment 73 .

[0349] For example, the first section 71 can be made of aluminum and electrically connected to the positive and negative electrode terminals. The third section 73 can be made of aluminum or copper and electrically connected to the connector 80. Since copper has higher conductivity than aluminum, the cross-sectional area of ​​the copper third section 73 is smaller than that of the aluminum first section 71 for the same overcurrent requirements. Using a copper-aluminum composite material for the current bus 70 allows for both welded connections to the positive and negative electrode terminals and saves installation space.

[0350] For example, the third section 73 and the connector 80 may be connected by crimping, welding, or bolts.

[0351] The connector 80 is used to introduce and extract electrical energy from the battery cell assembly 10. It can connect the battery device in which it is located with other battery devices, and can also be connected to other electrical devices or charging devices. Drawing electrical energy from the battery cell assembly 10 can enable the battery device to provide electrical energy to the electrical device, and introducing electrical energy into the battery cell assembly 10 can charge the battery device and store electrical energy. For example, the vehicle-end connector of an electric vehicle is connected to the connector 80 to obtain electrical energy from the battery device. For another example, the connector 80 of one battery device is connected to the connector 80 of another battery device through a cable, a bar, or other connector, so that more electrical energy can be provided to the electrical device. For a further example, the connector 80 can be connected to a commercial power supply so that the commercial power supply can charge the battery device.

[0352] Because the positive and negative leads of the battery cell assembly 10 are led to the exterior of the battery case via the positive and negative current collectors 70, respectively, high-voltage connectors and connectors can be installed outside the battery case, eliminating the need for conventional adapter installation within the interior of the battery case (i.e., the housing). This reduces the number of components and the space occupied within the battery case, thereby improving the assembly efficiency of the battery assembly 100 and thereby increasing the volumetric energy density of the battery assembly 100. Furthermore, because the current collector 70 allows direct connection to the positive and negative leads of the battery cell assembly 10 without intermediary components, this not only reduces the number of components, material costs, and production costs, but also reduces the connection resistance between the leads and the external high-voltage connector, thereby improving current handling capacity and mitigating overcurrent heating. Furthermore, it reduces the risk of poor connection of adapter components and improves connection reliability. In addition, since the battery case has a through-hole 27 and the second section 72 of the current collector 70 is passed through the through-hole 27 , the high-voltage connection end can be easily led out of the case through the current collector 70 .

[0353] In some embodiments, as Figures 11 to 13 As shown, the third section 73 of the current collector 70 is bent relative to the second section 72 and extends along the wall surface of the side wall 23 .

[0354] The extending directions of the third sections 73 in the plurality of current collectors 70 may be the same or different.

[0355] The through-hole 27 is located between the first sidewall 231 and the first wall. The third section 73 of the manifold 70 is bent relative to the second section 72 and extends in the first direction away from the first wall. Furthermore, the third section 73 is closely attached to the first sidewall 231. Of course, the through-hole 27 can also be located between other sidewalls 23 and the first wall and / or the second wall 22, but this will not be discussed here.

[0356] Therefore, the third section 73 can be disposed close to the side wall 23 , and the third section 73 and the battery box can be arranged closely, thereby reducing the overall size of the battery device 100 .

[0357] In some embodiments, as Figures 11 to 13 As shown, the third section 73 of one of the positive electrode collector 70 and the negative electrode collector 70 is bent relative to the second section 72 and extends along the wall surface of the side wall 23, and the third section 73 of the other one is bent relative to the second section 72 and extends along the wall extension direction of the side wall 23 in a direction away from the side wall 23.

[0358] Exemplarily, the third sections 73 in the plurality of busbars 70 extend in opposite directions.

[0359] The through-hole 27 is located between the first sidewall 231 and the first wall; the third section 73 of the current collector 70 is bent relative to the second section 72. Along the first direction, the third section 73 of one of the positive electrode current collector 70 and the negative electrode current collector 70 extends away from the first wall, while the third section 73 of the other extends away from the second wall 22. That is, the third section 73 of the positive electrode current collector 70 and the third section 73 of the negative electrode current collector 70 extend in opposite directions along the first direction. Of course, the through-hole 27 can also be located between other sidewalls 23 and the first wall and / or second wall 22, which will not be described in detail here.

[0360] Therefore, the third sections 73 in some of the current busbars 70 and the third sections 73 in another part of the current busbars 70 extend in opposite directions, which facilitates electrical connection between different battery devices 100 .

[0361] In some embodiments, as Figure 12 As shown, the busbar 70 further includes a fuse portion 74 , which is located outside the accommodating cavity and connected between the second section 72 and the third section 73 .

[0362] The fuse 74 is used to automatically cut off the current when a short circuit or severe overload occurs in the circuit, thereby powering off the battery device 100 .

[0363] The fusing portion 74 may be a fuse or a fuse.

[0364] The fuse 74 is connected in series between the second section 72 and the third section 73 .

[0365] Since the busbar 70 also includes a fuse portion 74, short-circuit protection of the battery device 100 can be achieved; and since the fuse portion 74 is located outside the accommodating cavity and connected between the second section 72 and the third section 73, the installation space in the accommodating cavity can be saved accordingly, thereby improving the overall grouping efficiency of the battery device 100; it is also beneficial to heat dissipation of the fuse portion 74, thereby increasing the service life of the fuse portion 74, and also facilitating maintenance and replacement of the fuse portion 74 from outside the accommodating cavity.

[0366] In some embodiments, the busbar 70 further includes a manual service disconnect (MSD), which is located outside the accommodating cavity and connected between the second section 72 and the third section 73 .

[0367] Exemplarily, a manual shutoff switch is connected in series between the second section 72 and the third section 73 .

[0368] Illustratively, the manual shutoff switch abuts against the side wall 23 .

[0369] The manual shutoff switch is a power-off device, which is mainly used to manually cut off the power supply to the battery device 100 during maintenance or emergency situations.

[0370] Since the busbar 70 also includes a manual shut-off switch, short-circuit protection of the battery device 100 can be achieved; and since the manual shut-off switch is located outside the accommodating cavity and connected between the second section 72 and the third section 73, the manual shut-off switch is arranged outside the accommodating cavity, which not only saves installation space inside the box and improves the grouping efficiency of the battery device 100; but also the manual shut-off switch is located outside the accommodating cavity, which is beneficial to the heat dissipation of the manual shut-off switch and increases the service life of the manual shut-off switch; and the manual shut-off switch is located outside the accommodating cavity, which is more convenient for after-sales maintenance and replacement.

[0371] A second aspect of the present invention provides a battery cluster 2000, such as Figure 19 As shown, the battery cluster 2000 includes a plurality of battery devices 100 according to any embodiment of the present application, and the plurality of battery devices 100 are electrically connected to each other.

[0372] By electrically connecting a plurality of battery devices 100 to form a battery cluster 2000 , higher energy can be provided.

[0373] In some embodiments, the plurality of battery devices 100 include a first battery device and a second battery device. Each battery device 100 includes a positive terminal connector 80 and a negative terminal connector 80 located outside its respective accommodating cavity. The positive terminal connector 80 of the first battery device is electrically connected to the negative terminal connector 80 of the second battery device; alternatively, the positive terminal connector 80 of the first battery device is electrically connected to the positive terminal connector 80 of the second battery device, and the negative terminal connector 80 of the first battery device is electrically connected to the negative terminal connector 80 of the second battery device.

[0374] The positive terminal connector 80 of the first battery device is electrically connected to the negative terminal connector 80 of the second battery device to achieve series connection between the first battery device and the second battery device.

[0375] The positive terminal connector 80 of the first battery device is electrically connected to the positive terminal connector 80 of the second battery device, and the negative terminal connector 80 of the first battery device is electrically connected to the negative terminal connector 80 of the second battery device to achieve parallel connection between the first battery device and the second battery device.

[0376] Thus, the battery devices 100 in the battery cluster 2000 can be connected in series or in parallel.

[0377] In some embodiments, as Figure 19As shown, multiple battery devices 100 include a first battery device and a second battery device stacked along a first direction. In the first battery device, the third segment 73 of the first positive electrode current bus extends in the opposite direction relative to the second segment 72 along the first direction as the third segment 73 of the first negative electrode current bus extends in the opposite direction relative to the second segment 72 along the first direction. In the second battery device, the third segment 73 of the second positive electrode current bus extends in the opposite direction relative to the second segment 72 along the first direction as the third segment 73 of the second negative electrode current bus extends in the opposite direction relative to the second segment 72 along the first direction. The first positive electrode current bus overlaps the second negative electrode current bus, and the third segment 73 of the first positive electrode current bus extends in the opposite direction relative to the second segment 72 along the first direction as the third segment 73 of the second negative electrode current bus extends in the opposite direction relative to the second segment 72 along the first direction.

[0378] Thus, the battery devices 100 can be connected in series by overlapping the busbars 70 of the two battery devices 100 with opposite polarities, eliminating the need for additional cables or connectors, and saving space accordingly.

[0379] In other embodiments, the extension direction of the third segment 73 in the first busbar for the positive electrode relative to the second segment 72 along the first direction is opposite to the extension direction of the third segment 73 in the second busbar for the positive electrode relative to the second segment 72 along the first direction, and the extension direction of the third segment 73 in the first busbar for the negative electrode relative to the second segment 72 along the first direction is opposite to the extension direction of the third segment 73 in the second busbar for the negative electrode relative to the second segment 72 along the first direction, or, the first busbar for the negative electrode overlaps the second busbar for the negative electrode, or the first busbar for the positive electrode overlaps the second busbar for the positive electrode.

[0380] Thus, the battery devices 100 can be connected in parallel by overlapping the busbars 70 of the two battery devices 100 with the same polarity, eliminating the need for additional cables or connectors, and saving space accordingly.

[0381] In some embodiments, as Figure 19 As shown, multiple battery devices 100 include a first battery device, a second battery device, and a battery management system connection harness 2100. The battery management system connection harness 2100 is used to electrically connect at least the battery management system 40 of the first battery device with the battery management system 40 of the second battery device.

[0382] The battery management system connection harness 2100 may be a communication harness.

[0383] For example, the battery management system 40 of the battery device 100 may also be connected to a higher control unit such as a main control box through a battery management system connection harness 2100 .

[0384] Therefore, the battery management system connection harness 2100 can be used to directly connect to the battery management system 40 to achieve cascade connection of communication harnesses between battery devices 100, or to achieve communication connection between the battery device 100 and a higher control unit such as a main control box.

[0385] In some embodiments, the sampling element 51 is a sampling cable bus comprised of multiple wires, each branching at a different location on the bus. The sampling cable bus includes a voltage sampling cable bus and a temperature sampling cable bus. The cable ends of the voltage sampling cable bus are stripped of their sheathing, and the wire metal is welded to the busbar assembly between the battery cells 11. The branch ends of the temperature sampling cable bus are connected to a temperature sensor 513 (Negative Temperature Coefficient Therministor, NTC). Temperature sensor 513 is a thermistor or probe whose resistance decreases rapidly with increasing temperature. The NTC is connected to the busbar assembly via a thermally conductive structural adhesive. The other end of the sampling cable bus is crimped to the battery management system connection module 60, which is used to connect to the battery management system. The sampling cable bus is typically integrated with the busbar assembly and wiring harness isolation plate, thereby improving overall battery pack assembly efficiency.

[0386] For example, the wire harness isolation plate generally has an insulating function and can be used to install busbar components and sampling wire harnesses.

[0387] After the sampling member 51 and the sampling connector 52 are installed, the sampling connector 52 is extended from the notch to the outside of the battery box, and the sampling connector 52 is plugged and connected to the battery management system connection module 60 of the battery management system outside the battery box.

[0388] After the battery management system connection module 60 is plugged in and connected, the battery management system protective cover is installed. A soft sealing gasket is designed around the edge of the battery management system bottom shell or the battery management system top cover. The connection interface between the sampling connector 52 and the battery management system is located on the inner side of the sealing gasket. After the battery management system bottom shell and the battery management system top cover are installed, the sampling connector 52 is clamped between the battery management system bottom shell and the battery management system top cover, and the sealing gasket is squeezed by the battery management system bottom shell and the battery management system top cover to achieve a good sealing protection.

[0389] For battery devices that use this sampling line design, the battery management system is installed on the outside of the battery box. When multiple battery boxes are used in series or parallel, they can be directly connected to the battery management system using a wiring harness to achieve cascade connection of communication harnesses between battery packs or communication connection between the battery device and higher control units such as the main control box.

[0390] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the present application.

Claims

1. A battery device, characterized in that: include: The battery box comprises a plurality of box walls, wherein the plurality of box walls enclose a sealed accommodating cavity; At least one battery cell assembly is accommodated in the accommodation cavity; Battery management system connection module; At least one sampling assembly, the sampling assembly comprising a sampling piece and a sampling connector, the sampling piece being located in the accommodating cavity, and the sampling connector being connected between the sampling piece and the battery management system connection module; The battery box has at least one through-hole, the sampling connector is passed through the through-hole, and is connected to the sampling component in the accommodating cavity, and is connected to the battery management system connection module outside the accommodating cavity. The sampling connecting piece includes a first connecting section, a second connecting section, and a third connecting section connected in sequence. The first connecting section is located in the accommodating cavity and connected to the sampling piece. The third connecting section is located outside the accommodating cavity. The second connecting section is provided through the through-hole. The third connecting section of the sampling connecting piece is bent relative to the second connecting section.

2. The battery device according to claim 1, wherein: The plurality of box walls include a first wall, a second wall, and a plurality of side walls, wherein the first wall and the second wall are arranged opposite to each other along a first direction, a first end of each side wall along the first direction is connected to the first wall, and a second end of each side wall along the first direction is connected to the second wall; The through opening is between the first end of at least one of the side walls and the first wall, and / or The through opening is between the second end of at least one of the side walls and the second wall.

3. The battery device according to claim 2, characterized in that In the case where the through-opening is provided between the first end of at least one of the side walls and the first wall, the first end of at least one of the side walls has a first notch partially recessed along a first direction, the first notch constituting the through-opening, and / or, In the case where the through opening is provided between the second end of at least one of the side walls and the second wall, the second end of at least one of the side walls has a second notch partially recessed along the first direction, and the second notch constitutes the through opening.

4. The battery device according to claim 2, wherein: The battery box also includes a sealing structure, The sealing structure is between the first end of at least one of the side walls and the first wall, and the through-hole is formed in the sealing structure, or, The sealing structure is between the second end of at least one of the side walls and the second wall, and the through-hole is formed in the sealing structure.

5. The battery device according to any one of claims 2 to 4, characterized in that The battery cell includes an electrode terminal. Along the first direction, the electrode terminal is close to the first wall. The through-hole is located between the first end of the side wall and the first wall.

6. The battery device according to any one of claims 2 to 4, characterized in that The battery device includes a battery management system, which is located outside the accommodating cavity, and the battery management system connection module is connected to the battery management system.

7. The battery device according to claim 6, characterized in that The battery management system includes a mounting shell and an integrated circuit board. The integrated circuit board is arranged in the mounting shell. At least a part of the battery management system connection module extends into the mounting shell and is electrically connected to the integrated circuit board.

8. The battery device according to claim 7, characterized in that The mounting shell includes a first shell and a second shell. The edge of the first shell has a first sealing surface, and the edge of the second shell has a second sealing surface. The battery management system further includes a sealing ring, and the first shell is connected to the second shell so that the sealing ring is sandwiched between the first sealing surface and the second sealing surface.

9. The battery device according to claim 8, characterized in that At least a portion of the sampling connector extends into the mounting shell, and the sealing ring is provided on both the side of the sampling connector close to the first shell and the side close to the second shell.

10. The battery device according to any one of claims 1 to 4, characterized in that The sampling component includes a sampling line array, and the sampling line array is composed of a plurality of sampling line bundles; and / or, The battery cell components correspond to the sampling components on a one-to-one basis.

11. The battery device according to claim 10, characterized in that The battery cell assembly includes a connecting bar and a plurality of battery cells, and adjacent battery cells are connected by the connecting bar; The plurality of sampling harnesses include a voltage sampling harness, and the voltage sampling harness is connected to the connection bar; and / or, The plurality of sampling harnesses include a temperature sampling harness, the sampling component further includes a temperature sensor, the temperature sampling harness is connected to the temperature sensor, and the temperature sensor is disposed on the connecting bar.

12. The battery device according to any one of claims 2 to 4, characterized in that The third connecting section of the sampling connecting piece extends along the wall surface of the side wall.

13. The battery device according to claim 12, wherein: There are multiple sampling connectors, and the third connecting sections of some of the sampling connectors extend along the first direction, while the third connecting sections of another part of the sampling connectors first extend along the first direction and then extend along the second direction, wherein the first direction and the second direction intersect each other.

14. The battery device according to any one of claims 2 to 4, characterized in that The battery cell assembly includes an electrode lead-out terminal, The battery device further comprises: At least one connector, used for introducing and extracting electrical energy to and from the battery cell assembly, the connector being located outside the accommodating cavity; at least one current busbar connected between the electrode lead-out terminal and the connector; The current collector is provided in the through-hole, one end of the current collector is connected to the electrode lead-out end in the accommodating cavity, and the other end is connected to the connector outside the accommodating cavity.

15. The battery device according to any one of claims 1 to 4, characterized in that The plurality of box walls include a first wall, a second wall, and a plurality of side walls, wherein the first wall and the second wall are arranged opposite to each other along a first direction, a first end of each side wall along the first direction is connected to the first wall, and a second end of each side wall along the second direction is connected to the second wall; The plurality of side walls include a first side wall and a second side wall arranged opposite to each other along the second direction, and a third side wall and a fourth side wall arranged opposite to each other along a third direction, wherein the first direction, the second direction, and the third direction intersect each other. The battery box includes a bottom plate, a first end plate, a second end plate, a first side plate, a second side plate and a cover. The cover body is formed as the first wall, the bottom plate is formed as the second wall, and the bottom plate has a heat exchange medium flow channel built in. The first end plate and the second end plate constitute the first side wall and the second side wall respectively. The first side plate and the second side plate constitute the third side wall and the fourth side wall respectively. The battery cell assembly is supported on the bottom plate, and the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with the battery cell assembly.

16. The battery device according to claim 15, characterized in that At least one of the first side panel and the second side panel is configured to include a side panel body portion and a side panel flange portion. The side plate main body is configured as a plate extending along the first direction, and the side plate main body is in contact with the battery cell assembly. The side plate flange portion is connected to one end of the side plate main body portion along the first direction, and the side plate flange portion is located on a side of the bottom plate away from the cover body along the first direction and is connected to the bottom plate.

17. The battery device according to claim 15, characterized in that The battery cell assembly includes a plurality of battery cells arranged along a second direction, the battery cells including a housing, the housing defining a housing space through connected housing walls, a large housing wall among the housing walls being perpendicular to the second direction, wherein the large housing wall is the housing wall with the largest area among the housing walls, The battery device further comprises at least one restraining member, The restraint member includes a restraint member main body and a restraint member connecting part. The restraint member connecting parts are located at both ends of the restraint member main body and are both connected to the restraint member main body. The restraint member connecting parts are connected to the first end plate and the second end plate.

18. The battery device according to claim 15, wherein: A sealing member is provided between the cover body and the first end plate, the second end plate, the first side plate, and the second side plate, and the sealing member is made of an adhesive.

19. The battery device according to claim 18, wherein: The cover includes a cover body and a plurality of press ribs extending along a second direction, wherein the press ribs are connected to a side of the cover body facing the battery cell assembly. The plurality of press rubber ribs include a first press rubber rib and a second press rubber rib, a first gap is formed between the first press rubber rib and the first side plate, and a second gap is formed between the second press rubber rib and the second side plate. The adhesive is present in the first gap and the second gap, and surfaces of the first and second press ribs facing the battery cell assembly in the first direction are bonded to surfaces of the battery cell assembly facing the cover in the first direction through the adhesive.

20. A battery cluster comprising a plurality of battery devices according to any one of claims 1 to 19, characterized in that: The plurality of battery devices are electrically connected to each other.

21. The battery cluster according to claim 20, characterized in that The plurality of battery devices include a first battery device, a second battery device and a battery management system connection harness, The battery management system connection harness is at least used to electrically connect the battery management system of the first battery device and the battery management system of the second battery device.

22. An electrical device, characterized in that: The electrical device includes at least one battery device according to any one of claims 1 to 19, or includes the battery cluster according to claim 20 or 21.

23. An energy storage device, characterized in that: The energy storage device includes at least one battery device according to any one of claims 1 to 19, or includes the battery cluster according to claim 20 or 21.

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