Battery case, battery, and electric device

Abstract

A battery case (110), a battery (100) and an electric device. The battery case (110) comprises a body (114) and expansion beams (113), wherein an accommodating cavity (115) is formed in the body (114), and the body (114) is provided with a first sidewall (1141) and a second sidewall (1142) that are opposite and spaced apart from each other; the expansion beams (113) are disposed in the accommodating cavity (115), two ends of each expansion beam (113) respectively being connected to the first sidewall (1141) and the second sidewall (1142); at least one of the first sidewall (1141) and the second sidewall (1142) is provided with mounting slots (116) on the side surface facing the accommodating cavity (115), a slot opening (1161) of each mounting slot (116) facing the accommodating cavity (115), and an assembly opening (1162) being provided on a slot sidewall (1163) of each mounting slot (116), the assembly opening (1162) penetrating the end of the slot sidewall (1163) facing the slot opening (1161); and an end portion (1131) of each expansion beam (113) is disposed in a corresponding mounting slot (116), and the end portion (1131) can be inserted into or removed from the corresponding mounting slot (116) through the assembly opening (1162). The problem of significant assembly difficulties caused by the expansion beams (113) being limited by the distance between the first sidewall (1141) and the second sidewall (1142) is alleviated, improving the assembly convenience of the battery case (110).

Description

Battery box, battery and electrical device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202420659953.8, filed on April 2, 2024, entitled “Battery Case, Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of battery-related equipment, and in particular to a battery box, a battery, and an electrical device. Background Art

[0004] This section merely provides background information related to the present application and is not necessarily prior art.

[0005] With the increasing demand for clean energy, power batteries have been widely developed. Power batteries typically consist of a battery case and battery cells mounted within the case. The ease of assembly of the battery case is crucial for power battery production, and ensuring ease of assembly has been a constant concern during battery research and development.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a battery box, a battery and an electrical device to improve the inconvenience of assembling the battery box by improving the assembly convenience of the expansion beam.

[0008] The first aspect of the present application proposes a battery box, including a main body and an expansion beam, wherein a accommodating cavity is formed in the main body, and the main body has a first side wall and a second side wall that are opposite and spaced apart; the expansion beam is arranged in the accommodating cavity, and the two ends of the expansion beam are respectively connected to the first side wall and the second side wall; at least one of the first side wall and the second side wall is provided with a mounting groove facing the side of the accommodating cavity, the notch of the mounting groove faces the accommodating cavity, and an assembly port is provided on the groove side wall of the mounting groove, the assembly port passes through the groove side wall toward one end of the notch, the end of the expansion beam is provided in the mounting groove at the corresponding end, and the end can be inserted into or removed from the corresponding mounting groove through the assembly port.

[0009] In the technical solution of the embodiment of the present application, at least one of the first side wall and the second side wall is provided with a mounting groove facing the side of the accommodating cavity, and the groove side wall of the mounting groove is provided with an assembly opening, and the assembly opening is connected to the groove opening of the mounting groove. In this way, during the assembly process of the expansion beam, the end portion of at least one end of the expansion beam can be inserted into the mounting groove along the side of the assembly opening, so that the expansion beam enters between the first side wall and the second side wall. The assembly opening forms an avoidance space for the expansion beam to be inserted into the mounting groove, alleviating the problem that the expansion beam is limited by the distance between the first side wall and the second side wall, resulting in greater assembly difficulty, so that the expansion beam can be assembled to the main body after the main body is assembled; and the assembly opening can play a guiding role in the assembly of the expansion beam, thereby improving the assembly convenience of the expansion beam, thereby improving the assembly convenience of the battery box.

[0010] In some embodiments of the present application, the side of the first side wall facing the accommodating cavity and the side of the second side wall facing the accommodating cavity are both provided with the mounting groove, and the orientation of the assembly opening of the first side wall is the same as the orientation of the assembly opening of the second side wall. The mounting grooves are both provided on the first side wall and the second side wall, and the orientation of the assembly openings of the mounting grooves at both ends is consistent, so that the expansion beam can be assembled into the mounting grooves through the assembly openings at both ends at the same time. This is not only convenient and quick to operate, but also can form an avoidance space in the same direction, further improving the assembly convenience of the expansion beam.

[0011] In some embodiments of the present application, the battery case further includes a mounting member, wherein the mounting member is connected to the side of at least one of the first side wall and the second side wall facing the accommodating cavity, and the mounting member is provided with the mounting groove, or the side of the first side wall or the second side wall facing the accommodating cavity cooperates with the corresponding mounting member to form the mounting groove. In this embodiment, by providing the mounting member on the first side wall and / or the second side wall, and forming the mounting groove by the mounting member in cooperation or independently, the strength of the body is not affected, and processing and assembly are convenient.

[0012] In some embodiments of the present application, the mounting member includes a fixed plate portion and a slot wall portion. The first sidewall or the second sidewall facing the accommodating cavity is connected to the fixed plate portion. The slot wall portion is connected to the side of the fixed plate portion facing the accommodating cavity. The slot wall portion surrounds at least a portion of the mounting slot. The fixed plate portion can improve the assembly convenience of the mounting member, and the mounting member has a simple structure and is relatively consumable.

[0013] In some embodiments of the present application, the fixed plate portion is provided with a notch, the groove wall portion surrounds the notch along the circumference of the notch, and the groove wall portion and the fixed plate portion jointly surround the notch to form the installation groove. The fixed plate portion is provided with a notch, and cooperates with the groove wall portion to form the installation groove, so that the installation groove passes through the opposite sides of the fixed plate portion, and the assembly opening is formed corresponding to the position of the notch of the fixed plate portion, so that the assembly opening can pass through the fixed plate portion and the groove wall portion, and the assembly opening can extend from the inner side surface of the first side wall or the inner side surface of the second side wall into the accommodating cavity, which is conducive to the expansion beam sliding into the installation groove by adhering to the inner wall surface of the first side wall or the second side wall, thereby improving the assembly convenience of the expansion beam.

[0014] In some embodiments of the present application, the side of the first side wall facing the accommodating cavity or the side of the second side wall facing the accommodating cavity is bonded to the corresponding plate surface of the fixing plate portion. The fixing plate portion is bonded to the inner side surface of the corresponding side wall, specifically by gluing or welding. This bonding method can increase the connection area between the fixing plate portion and the inner side surface, thereby improving the connection stability of the mounting member on the body.

[0015] In some embodiments of the present application, the fixing plate and the groove wall are integrally structured, which can improve the connection stability between the fixing plate and the groove wall, thereby improving the stability of the connection between the expansion beam and the body.

[0016] In some embodiments of the present application, the body further includes a bottom wall connected to the same end of the first side wall and the second side wall, and the assembly opening is disposed toward the side where the bottom wall is located or toward the side away from the bottom wall. The expansion beam is inserted into the installation slot starting from the top or bottom end of the first side wall or the second side wall along the height direction of the body, which facilitates operation.

[0017] In some embodiments of the present application, the mounting groove is provided at one end of the first side wall or the second side wall facing the bottom wall, the assembly opening is provided toward the side where the bottom wall is located, and the bottom wall covers the assembly opening. The mounting groove is provided close to the bottom wall, and the assembly opening is provided toward the side where the bottom wall is located. The expansion beam can be directly inserted into the mounting groove through the assembly opening along one end of the first side wall and the second side wall close to the bottom wall, thereby improving the assembly efficiency and convenience of the expansion beam. At the same time, the bottom wall covers the assembly opening, which can have a certain limiting effect on the expansion beam in the mounting groove, thereby improving the installation stability of the expansion beam in the mounting groove.

[0018] In some embodiments of the present application, the end of the expansion beam is clamped in the mounting slot; and / or the end of the expansion beam is welded to the wall of the mounting slot; and / or the end of the expansion beam is connected to the wall of the mounting slot via a fastener. In addition to the guiding and limiting functions of the mounting slot, further incorporating clamping, welding, or fasteners can improve the assembly stability of the expansion beam and the body.

[0019] In some embodiments of the present application, the end portion of the expansion beam partially protrudes to form a protrusion, and the protrusion is disposed within the mounting groove. By partially protruding the end portion to form the protrusion, the size of the mounting groove can be reduced compared to a method in which the entire end portion is disposed within the mounting groove, thereby reducing consumables required to form the mounting groove. In addition, compared to an integral end portion, the protrusion has less sliding resistance within the mounting groove, thereby facilitating assembly of the expansion beam.

[0020] In some embodiments of the present application, the sidewalls of the mounting slot include a first wall and a second wall, the first wall and the second wall being respectively disposed on either side of the assembly opening along a first direction, and both the first wall and the second wall extending in the direction of the assembly opening, wherein the first direction, the direction of the assembly opening, and the direction of the slot intersect with each other. The first wall and the second wall both extend in the direction of the assembly opening, and when the expansion beam is inserted into the mounting slot through the assembly opening, it can slide along the first wall and the second wall into the mounting slot. The first wall and the second wall can serve as a good guide, thereby improving the assembly convenience of the expansion beam.

[0021] In some embodiments of the present application, the first wall is inclined gradually away from the second wall along the direction of the assembly opening; and / or the second wall is inclined gradually away from the first wall along the direction of the assembly opening. The first side wall can be inclined to form a flared structure at the assembly opening; the second wall can also be inclined to form a flared structure at the assembly opening, thereby facilitating the insertion of the expansion beam into the assembly opening and into the mounting groove along the assembly opening.

[0022] In some embodiments of the present application, the end portion of the expansion beam partially protrudes to form a protrusion, which is disposed within the mounting groove and abuts between the first wall and the second wall along the first direction. The first wall and the second wall restrict movement of the protrusion in the first direction, thereby securing the expansion beam in the first direction and improving assembly stability between the expansion beam and the body.

[0023] In some embodiments of the present application, the sidewalls of the mounting slot further include a third wall, the third wall being connected between the first wall and the second wall and disposed opposite the assembly opening in the direction of the assembly opening, with the protrusion abutting against the third wall. The third wall can restrict movement of the protrusion in a direction away from the assembly opening, thereby improving the assembly stability of the expansion beam and the body and locating the installation position of the expansion beam in the direction of the assembly opening.

[0024] In some embodiments of the present application, along the direction of the notch, the bottom wall of the mounting slot abuts against the protrusion, which can limit the movement of the expansion beam along the extension direction of the expansion beam, thereby improving the assembly stability of the expansion beam and the body.

[0025] In some embodiments of the present application, there are multiple expansion beams, which are spaced apart and each expansion beam has two ends connected to the first side wall and the second side wall, respectively. At least one end of each expansion beam is provided with a corresponding mounting slot. Battery cells are positioned between adjacent expansion beams, so that both sides of the battery cells can abut against the expansion beams to protect the battery housing. Each expansion beam is installed through its corresponding mounting slot, making it easy to operate.

[0026] In some embodiments of the present application, a loading connector is provided on a side of the body facing away from the accommodating cavity. The loading connector is used to secure the battery to an electrical device, such as a vehicle chassis. The provision of the loading connector improves the ease of connection between the battery case and the electrical device, thereby increasing the efficiency of battery assembly in the electrical device.

[0027] The second aspect of the present application proposes a battery, including a battery box and a battery cell. The battery box is the battery box proposed in the present application or any embodiment of the present application. The battery cell is arranged in the accommodating cavity, and the battery cell abuts against the expansion beam.

[0028] The third aspect of the present application provides an electrical device, comprising the battery provided in the present application or any embodiment of the present application.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0031] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0032] FIG2 is an exploded schematic diagram of a battery provided in some embodiments of the present application;

[0033] FIG3 is an exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0034] FIG4 is a partial structural diagram of a battery box according to some embodiments of the present application;

[0035] FIG5 is an enlarged view of portion A of FIG4 ;

[0036] FIG6 is an exploded structural diagram of a battery box according to some embodiments of the present application;

[0037] FIG7 is an enlarged view of portion B of FIG6 ;

[0038] FIG8 is a schematic structural diagram of a mounting member according to some embodiments of the present application;

[0039] FIG9 is a schematic structural diagram of a mounting member according to some embodiments of the present application;

[0040] FIG10 is an enlarged view of portion C of FIG4 ;

[0041] FIG11 is an enlarged view of portion D of FIG6 ;

[0042] FIG12 is a schematic diagram of an expansion beam according to some embodiments of the present application;

[0043] FIG13 is a cross-sectional view of an expansion beam in some embodiments of the present application with its end portion disposed in a mounting groove;

[0044] FIG14 is a schematic diagram of an expansion beam according to some embodiments of the present application;

[0045] FIG15 is a cross-sectional schematic diagram of an expansion beam end portion disposed in a mounting groove in some embodiments of the present application.

[0046] The accompanying drawings in the specific implementation manner are as follows:

[0047] 1000, vehicle;

[0048] 100, battery; 110, battery case; 111, first portion; 112, second portion; 113, expansion beam; 1131, end portion; 1132, protrusion; 1133, first end; 1134, second end; 1135, first expansion beam; 1136, second expansion beam; 114, body; 1141, first side wall; 1142, second side wall; 1143, third side wall; 1144, fourth side wall; 1145, bottom wall; 115, accommodating cavity; 116, mounting slot; 1161, slot opening; 1162, assembly opening; 1163, slot side wall; 1164, first wall; 1165, second wall; 1166, third wall; 1167, slot bottom wall;

[0049] 120. Battery cell; 121. End cap; 122. Electrode terminal; 123. Pressure relief assembly; 124. Housing; 125. Cell assembly; 126. Tab;

[0050] 130, mounting member; 131, fixing plate portion; 132, groove wall portion; 133, notch;

[0051] 140. Loading connectors;

[0052] 200, controller;

[0053] 300, motor;

[0054] X1, length direction; Y1, width direction; Z1, height direction; X2, first direction. DETAILED DESCRIPTION

[0055] 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.

[0056] 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 and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0057] In the description of the embodiments of this application, the technical terms "first" and "second" 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 clearly and specifically defined.

[0058] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0059] 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.

[0060] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0061] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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 and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0062] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," 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.

[0063] Batteries can store electrical energy and power electrical devices. With the development of new energy sources, batteries are being used in an increasingly wide range of applications. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace.

[0064] A battery may include a battery case and battery cells. The battery case is used to house the battery cells. During battery use, the battery cells may expand due to charging and discharging or other factors. This expansion of the battery cells may cause the battery case to deform, affecting the structural strength and reliability of the battery case. This deformation may also affect the normal use of the battery, thereby affecting the battery's reliability.

[0065] In some technologies, an expansion beam is provided in the battery case to alleviate the problem of deformation of the battery case caused by the battery cells. The expansion beam is provided inside the battery case and is used to abut against the battery cells to resist the expansion force of the battery cells. The expansion beam can be installed on two opposite side walls of the battery case. When assembling the battery, the expansion beam is generally assembled first, that is, the expansion beam is first connected to the corresponding side wall, and then the side wall connected to the expansion beam is connected to the other side walls of the battery case. This is because if the side walls of the battery are assembled first and then the expansion beam is assembled into the battery case, the expansion beam can only be inserted into the battery case from one end, but the length of the expansion beam is equivalent to the distance between the two side walls to which it is connected. When the expansion beam is assembled into the battery case, it is easy to interfere with the side walls of the battery case to which it is connected, making it difficult to assemble the expansion beam to the appropriate position and affecting the assembly effect of the expansion beam.

[0066] This method of assembling the expansion beam first makes the battery box easily deformed after the side walls of the battery box are connected to each other. In addition, this assembly method prevents the frame of the battery box from being formed in one piece, and can only be assembled by splicing multiple side walls together, which makes the assembly flexibility and convenience of the battery box poor.

[0067] In order to alleviate the problem of poor assembly flexibility and convenience of a battery box, the present application provides a battery box, including a main body and an expansion beam, a accommodating cavity is formed in the main body, and the main body has a first side wall and a second side wall that are opposite and spaced apart; the expansion beam is arranged in the accommodating cavity, and the two ends of the expansion beam are respectively connected to the first side wall and the second side wall; at least one of the first side wall and the second side wall is provided with a mounting groove facing the side of the accommodating cavity, the notch of the mounting groove faces the accommodating cavity, an assembly port is provided on the groove side wall of the mounting groove, the assembly port passes through the groove side wall toward one end of the notch, the end of the expansion beam is provided in the mounting groove at the corresponding end, and the end can be inserted into or removed from the corresponding mounting groove through the assembly port.

[0068] The notch of the mounting groove faces the accommodating cavity, so that the expansion beam can be inserted into the mounting groove after assembly is completed. The assembly opening is set on the groove side wall of the mounting groove, and the assembly opening passes through the groove side wall toward one end of the notch, so that when the expansion beam is assembled to the first side wall and the second side wall, the end of at least one end of the expansion beam can be inserted into the mounting groove along the side of the assembly opening. The assembly opening forms an avoidance space for the expansion beam to be inserted into the mounting groove, alleviating the problem that the expansion beam is limited by the distance between the first side wall and the second side wall, which causes greater difficulty in assembly. It also allows the expansion beam to be assembled to the body after the side wall of the body is assembled into a closed frame, which is conducive to correcting the shape of the closed frame of the body through the expansion beam, reducing the possibility of deformation of the body; and the assembly opening can play a guiding role in the assembly of the expansion beam, improving the assembly convenience of the expansion beam, thereby improving the assembly convenience of the battery box.

[0069] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery disclosed in the present application can be used to form an electrical device.

[0070] The present invention provides an electric device that uses a battery as a power source. The electric device may be, 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.

[0071] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0072] Please refer to Figure 1, which is a schematic structural diagram of a vehicle provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0073] In some embodiments of the present application, the battery 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.

[0074] Please refer to Figure 2, which is an exploded schematic diagram of a battery provided in some embodiments of the present application. The battery 100 includes a battery case 110 and a battery cell 120, with the battery cell 120 being housed within the battery case 110. The battery case 110 is used to provide a storage space for the battery cell 120, and the battery case 110 can adopt various structures. In some embodiments, the battery case 110 can include a first portion 111 and a second portion 112, which overlap with each other and together define a storage space for accommodating the battery cell 120. The second portion 112 can be a hollow structure with one end open, and the first portion 111 can be a plate-like structure, which overlaps the open side of the second portion 112, so that the first portion 111 and the second portion 112 together define a storage space. The first portion 111 and the second portion 112 can also be hollow structures with one end open, with the open side of the first portion 111 overlapping the open side of the second portion 112. Of course, the battery case 110 formed by the first part 111 and the second part 112 can be in various shapes, such as a cylinder, a cuboid, etc.

[0075] In the battery 100, there may be one or more battery cells 120. In the case of multiple battery cells, the multiple battery cells 120 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 120. The multiple battery cells 120 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 120 may be housed within the battery case 110. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 120 in series, in parallel, or in a hybrid connection to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid connection to form an entire battery cell, and then housed within the battery case 110. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 120.

[0076] Each battery cell 120 may be a secondary battery 100 or a primary battery 100; it may also be a lithium-sulfur battery 100, a sodium-ion battery 100, or a magnesium-ion battery 100, but is not limited thereto. The battery cell 120 may be cylindrical, flat, rectangular, or in other shapes.

[0077] Please refer to Figure 3, which is an exploded schematic diagram of a battery cell provided in some embodiments of the present application. The battery cell 120 includes an end cap 121, a housing 124, a cell assembly 125, and other functional components. The battery cell 120 is the smallest unit that makes up the battery 100.

[0078] The end cap 121 refers to a component that covers the opening of the shell 124 to isolate the internal environment of the battery cell 120 from the external environment. Without limitation, the shape of the end cap 121 can be adapted to the shape of the shell 124 to match the shell 124. Optionally, the end cap 121 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 121 is not easily deformed when squeezed or collided, so that the battery cell 120 can have a higher structural strength and improved safety performance. Functional components such as electrode terminals 122 can be provided on the end cap 121. The electrode terminal 122 can be used to electrically connect to the battery cell assembly 125 for outputting or inputting electrical energy of the battery cell 120. In some embodiments, the end cap 121 may also be provided with a pressure relief assembly 123 for releasing the internal pressure of the battery cell 120 when the internal pressure or temperature reaches a threshold. The pressure relief assembly 123 may specifically take the form of an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and may specifically employ a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure or temperature of the battery 100 reaches a predetermined threshold, the pressure relief assembly 123 actuates or a weak structure provided in the pressure relief assembly 123 is destroyed, thereby forming an opening or channel for releasing the internal pressure of the battery 100. The end cap 121 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitation on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap 121. The insulating member may be used to isolate the electrical connection components in the housing 124 from the end cap 121 to reduce the risk of short circuits. For example, the insulating member may be plastic, rubber, etc.

[0079] The housing 124 is a component that cooperates with the end cap 121 to form the internal environment of the battery cell 120. This internal environment can accommodate the battery cell assembly 125, electrolyte, and other components. The housing 124 and the end cap 121 can be separate components. An opening can be provided in the housing 124, and the end cap 121 is placed over the opening to form the internal environment of the battery cell 120. Alternatively, the end cap 121 and the housing 124 can be integrated. Specifically, the end cap 121 and the housing 124 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 124 needs to be enclosed, the end cap 121 is placed over the housing 124. The housing 124 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 124 can be determined based on the specific shape and size of the battery cell assembly 125. The shell 124 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0080] The cell assembly 125 is a component in the battery cell 120 where electrochemical reactions occur. One or more cell assemblies 125 may be contained in the housing 124. The cell assembly 125 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the cell assembly 125, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 126. The positive tab 126 and the negative tab 126 may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the tab 126 connects to the electrode terminal 122 to form a current loop.

[0081] Please refer to Figures 4 to 7, Figure 4 is a partial structural diagram of the battery case of some embodiments of the present application; Figure 5 is an enlarged view of part A of Figure 4, Figure 6 is an exploded structural diagram of the battery case of some embodiments of the present application, and Figure 7 is an enlarged view of part B of Figure 6. The embodiment of the present application provides a battery case 110, including a main body 114 and an expansion beam 113, a receiving cavity 115 is formed in the main body 114, and the main body 114 has a first side wall 1141 and a second side wall 1142 that are opposite and spaced apart; the expansion beam 113 is arranged in the receiving cavity 115, and the two ends of the expansion beam 113 are respectively connected to the first side wall 1141 and the second side wall 1142; at least one of the first side wall 1141 and the second side wall 1142 is provided with a mounting groove 116 facing the side of the receiving cavity 115. The slot opening 1161 of the mounting slot 116 faces the accommodating cavity 115 , and an assembly opening 1162 is provided on the slot side wall 1163 of the mounting slot 116 . The assembly opening 1162 passes through the slot side wall 1163 and faces one end of the slot opening 1161 . The end portion 1131 of the expansion beam 113 is provided in the mounting slot 116 at the corresponding end, and the end portion 1131 can be inserted into or removed from the corresponding mounting slot 116 through the assembly opening 1162 .

[0082] The main body 114 is also the main part of the battery case 110, which forms a accommodating cavity 115, and the accommodating cavity 115 is used to accommodate the battery cell 120. The main body 114 may include a frame, and the frame is arranged to form the accommodating cavity 115. The main body 114 may also include a bottom plate, which is arranged at the bottom end of the frame to serve as the bottom wall 1145 of the main body 114 and seal the bottom end of the accommodating cavity 115. In the battery case 110, a top plate assembly may also be provided at the end of the frame away from the bottom plate to seal the accommodating cavity 115. Referring to Figure 2, the bottom plate and the frame may constitute the second part 112, and the top plate assembly may be the first part 111.

[0083] The first side wall 1141 and the second side wall 1142 can be understood as two side walls arranged opposite to each other in the frame. The frame can be a roughly rectangular frame, and its first side wall 1141 and the second side wall 1142 can be arranged opposite to each other and in parallel. In addition to the first side wall 1141 and the second side wall 1142, the frame can also include a third side wall 1143 and a fourth side wall 1144 that are arranged opposite to each other and spaced apart, the third side wall 1143 being connected between one end of the first side wall 1141 and one end of the second side wall 1142, and the fourth side wall 1144 being connected between the other end of the first side wall 1141 and the other end of the second side wall 1142. In other words, the first side wall 1141, the third side wall 1143, the second side wall 1142 and the fourth side wall 1144 are connected end to end in sequence to form the frame.

[0084] Expansion beam 113 is disposed in accommodating cavity 115 and may be in the form of a strip, block, or plate. The structural design and installation of expansion beam 113 are mutually reinforcing. Expansion beam 113 can be fabricated using a variety of processes, including profiled expansion beam 113, rolled expansion beam 113, sheet metal expansion beam 113, and die-cast expansion beam 113.

[0085] The two ends of the expansion beam 113 may be oppositely spaced along its length. For ease of description, the end of the expansion beam 113 connected to the first side wall 1141 is defined as the first end 1133, and the end of the expansion beam 113 connected to the second side wall 1142 is defined as the second end 1134. In this embodiment, the length direction of the expansion beam 113 can be understood with reference to the width direction Y1 of the battery case 110.

[0086] After the battery cell 120 is assembled within the battery case 110 to form the battery 100, the expansion beam 113 is positioned on one side of the battery cell 120 and abuts against the battery cell 120. The expansion beam 113 may have a hollow cavity within it. When the battery cell 120 tends to expand, the expansion beam 113 abuts the battery cell 120, utilizing the deformation of the accommodating cavity 115 to absorb and transmit the expansion force, thereby reducing the probability of deformation of the battery case 110 due to the expansion force.

[0087] The side of the first sidewall 1141 facing the accommodating cavity 115 may be provided with a mounting groove 116. The end 1131 of the first end 1133 of the expansion beam 113 is disposed within the mounting groove 116 of the first sidewall 1141 to connect with the first sidewall 1141. The side of the second sidewall 1142 facing the accommodating cavity 115 may be provided with a mounting groove 116. The end 1131 of the second end 1134 of the expansion beam 113 is disposed within the mounting groove 116 of the second sidewall 1142 to connect with the second sidewall 1142. One of the first sidewall 1141 and the second sidewall 1142 may be provided with the mounting groove 116 of the present embodiment, while the other may not be provided with the mounting groove 116 of the present embodiment. In other words, the expansion beam 113 may be fixed to the corresponding sidewall at one end via the mounting groove 116 with the assembly opening 1162, while the other end may be connected to the corresponding sidewall by other means. For example, in some possible implementations, a mounting groove 116 with an assembly opening 1162 is provided on the side of the first side wall 1141 facing the accommodating cavity 115, and the first end 1133 of the expansion beam 113 is inserted into the mounting groove 116 through the assembly opening 1162 and is provided in the mounting groove 116 of the first side wall 1141 to be connected to the first side wall 1141, and the other end of the expansion beam 113 is directly welded to the second side wall 1142; for another example, the first side wall 1141 faces the accommodating cavity The side of 115 is provided with a mounting groove 116 with an assembly opening 1162, and the side of the second side wall 1142 facing the accommodating cavity 115 is provided with an assembly groove without the assembly opening 1162. The first end 1133 of the expansion beam 113 is inserted into the mounting groove 116 corresponding to the end through the assembly opening 1162 and is arranged in the mounting groove 116. The second end 1134 of the expansion beam 113 is inserted into the assembly groove corresponding to the end through the groove opening 1161 of the assembly groove to be connected to the second side wall 1142.

[0088] The side of the first sidewall 1141 facing the accommodating cavity 115 is also the inner side of the first sidewall 1141, and the side of the second sidewall 1142 facing the accommodating cavity 115 is also the inner side of the second sidewall 1142. The mounting groove 116 can be formed by a partial depression in the inner side of the first sidewall 1141 or the inner side of the second sidewall 1142. Alternatively, a mounting member 130 can be provided on the inner side of the first sidewall 1141 or the inner side of the second sidewall 1142, with the mounting groove 116 provided thereon, or the mounting member 130 can cooperate with the corresponding inner side surface to form the mounting groove 116. The mounting member 130 can protrude relative to the inner side surface on which it is located.

[0089] The notch 1161 of the mounting groove 116 faces the accommodating cavity 115, so that when the expansion beam 113 is assembled to the battery case 110, its end 1131 can be inserted into the mounting groove 116. Specifically, the notch 1161 of the mounting groove 116 set on the first side wall 1141 can be set toward the second side wall 1142, and the notch 1161 of the mounting groove 116 set on the second side wall 1142 can be set toward the first side wall 1141. The groove side wall 1163 of the mounting groove 116 is the groove wall connected between the notch 1161 and the groove bottom wall 1167. The groove bottom wall 1167 is the groove wall opposite the notch 1161. In other words, the groove side wall 1163 extends generally along the depth direction of the mounting groove 116. An assembly opening 1162 is provided on the groove side wall 1163 of the mounting groove 116, and the assembly opening 1162 passes through one end of the groove side wall 1163 toward the groove 1161, so that the assembly opening 1162 is connected with the groove 1161. In this way, when the end portion 1131 of the expansion beam 113 is inserted from the assembly opening 1162 into the mounting groove 116, the expansion beam 113 will not interfere with the mounting groove 116 and can be smoothly inserted into the mounting groove 116.

[0090] In order to make the mounting groove 116 match the expansion beam 113 , the mounting groove 116 may be designed to imitate the structure of the end portion 1131 of the expansion beam 113 .

[0091] The end portion 1131 can be inserted into or removed from the corresponding mounting slot 116 through the assembly opening 1162 . That is, the size of the assembly opening 1162 is larger than or adapted to the corresponding size of the expansion beam 113 to allow the expansion beam 113 to pass through the assembly opening 1162 .

[0092] In the battery case 110 of the embodiment of the present application, when the expansion beam 113 is assembled to the first side wall 1141 and the second side wall 1142, the end portion 1131 of at least one end of the expansion beam 113 can be inserted into the installation groove 116 laterally along the assembly opening 1162. The assembly opening 1162 forms an avoidance space for the expansion beam 113 to be inserted into the installation groove 116, alleviating the problem that the expansion beam 113 is limited by the distance between the first side wall 1141 and the second side wall 1142, causing greater difficulty in assembly, and allowing the expansion beam 113 to be assembled to the main body 114 after the main body 114 is assembled into a closed frame, which is conducive to correcting the shape of the closed frame of the main body 114 through the expansion beam 113, reducing the possibility of deformation of the main body 114; and the assembly opening 1162 can guide the assembly of the expansion beam 113, thereby improving the assembly convenience of the expansion beam 113, thereby improving the assembly convenience of the battery case 110. At the same time, the end 1131 of the expansion beam 113 is arranged in the installation groove 116. Compared with the method of directly welding the expansion beam 113 to the surface of the main body 114, it is more conducive to the spraying treatment of the edges and corners, and improves the treatment effect of the surface of the battery box 110.

[0093] It should also be noted that in this embodiment, the expansion beam 113 is assembled with the main body 114 by inserting it into the installation groove 116, which can also facilitate the disassembly of the expansion beam 113. During the disassembly process, the expansion beam 113 only needs to be moved outward along the assembly opening 1162.

[0094] According to some embodiments of the present application, optionally, both the side of the first side wall 1141 facing the accommodating cavity 115 and the side of the second side wall 1142 facing the accommodating cavity 115 are provided with an installation groove 116, and the direction Z2 of the assembly port 1162 of the installation groove 116 of the first side wall 1141 is the same as the direction Z2 of the assembly port 1162 of the installation groove 116 of the second side wall 1142.

[0095] It is understandable that the installation groove 116 on the first side wall 1141 and the installation groove 116 on the second side wall 1142 both have an assembly opening 1162 , and the end portions 1131 of the expansion beam 113 are respectively disposed in the installation grooves 116 at the corresponding ends.

[0096] Both the first side wall 1141 and the second side wall 1142 are provided with mounting grooves 116, and the assembly openings 1162 of the mounting grooves 116 at both ends are oriented in the same direction Z2, so that the expansion beam 113 can be assembled into the mounting grooves 116 through the assembly openings 1162 at both ends at the same time. This is not only convenient and quick to operate, but also can form an avoidance space in the same direction, further improving the assembly convenience of the expansion beam 113.

[0097] According to some embodiments of the present application, optionally, as shown in Figures 4 to 7, and in combination with Figures 8 and 9, Figure 8 is a structural schematic diagram of the mounting parts of some embodiments of the present application, and Figure 9 is a structural schematic diagram of the mounting parts of some embodiments of the present application. The battery box 110 also includes a mounting part 130, and at least one of the first side wall 1141 and the second side wall 1142 is connected to the side of the accommodating cavity 115 with the mounting part 130, and the mounting part 130 is provided with a mounting groove 116, or the first side wall 1141 or the second side wall 1142 is cooperated with the corresponding mounting part 130 to form the mounting groove 116 on the side of the accommodating cavity 115.

[0098] As shown in Figures 7 and 8, the mounting member 130 can independently form the mounting groove 116, and the groove bottom wall 1167 and groove sidewalls 1163 of the mounting groove 116 are both formed by the mounting member 130. The mounting member 130 can be a block or plate-shaped member, and can be a structure formed by integral casting, machining, or other processes, or can be a structure composed of multiple parts.

[0099] As shown in FIG9 , and further in conjunction with FIG10 and FIG11 , FIG10 is an enlarged view of portion C of FIG4 , and FIG11 is an enlarged view of portion D of FIG6 , the mounting member 130 cooperates with the wall surface of the first side wall 1141 or the second side wall 1142 on which it is located to form the mounting groove 116. Specifically, the position of the side of the first side wall 1141 or the second side wall 1142 facing the accommodating cavity 115 corresponding to the mounting groove 116 can serve as the bottom wall 1167 of the mounting groove 116, and the mounting member 130 can be used to surround and form the groove side walls 1163 of the mounting groove 116.

[0100] The mounting member 130 can be welded to the first side wall 1141, and the mounting member 130 can be welded to the second side wall 1142. During the assembly of the battery case 110, the mounting member 130 and the mounting member 130 can be pre-assembled on the body 114. Specifically, the body 114 and the mounting member 130 can be connected to form an integral structure, specifically, they can be welded together.

[0101] In this embodiment, the mounting member 130 is provided on the first side wall 1141 and / or the second side wall 1142 , and the mounting groove 116 is formed by the mounting member 130 in cooperation with or independently of the mounting member 130 , which does not affect the strength of the body 114 and is easy to process and assemble.

[0102] According to some embodiments of the present application, optionally, as shown in Figures 4 to 7, and in combination with Figures 8 and 9, the mounting member 130 includes a fixed plate portion 131 and a groove wall plate portion 132, the first side wall 1141 facing the side of the accommodating cavity 115 or the second side wall 1142 facing the side of the accommodating cavity 115 is connected to the fixed plate portion 131, the groove wall plate portion 132 is connected to the side of the fixed plate portion 131 facing the accommodating cavity 115, and the groove wall plate portion 132 at least surrounds a portion of the mounting groove 116.

[0103] Among them, the fixed plate portion 131 is used to connect with the body 114, and the groove wall plate portion 132 is fixed to one side of the fixed plate portion 131. The groove wall plate portion 132 at least surrounds and forms a portion of the installation groove 116. It can be understood that at least the groove wall plate portion 132 of the fixed plate portion 131 and the groove wall plate portion 132 participates in surrounding and forming the installation groove 116. Specifically, the groove wall plate portion 132 can independently surround and form the installation groove 116; as shown in Figure 8, the groove wall plate portion 132 and the fixed plate portion 131 can also surround and form the installation groove 116 on the side facing the accommodating cavity; as shown in Figure 9, the installation groove 116 can also pass through the fixed plate portion 131 and the groove wall plate portion 132, that is, the installation groove 116 can also be formed by the fixed plate portion 131 and the groove wall plate portion 132.

[0104] It can be understood that the groove wall plate portion 132 can be arranged roughly parallel to the inner surface of the first side wall 1141 or the second side wall 1142 on which it is located to improve the convenience of assembly, and the plate surface of the groove wall plate portion 132 can be roughly perpendicular to the fixed plate portion 131 to increase the extension length of the groove side wall 1163, that is, to increase the groove depth of the installation groove 116.

[0105] In this embodiment, the fixing plate portion 131 can improve the assembly convenience of the mounting member 130 , and the mounting member 130 has a simple structure and saves consumables.

[0106] According to some embodiments of the present application, optionally, as shown in Figures 9 to 11, a notch 133 is provided on the fixed plate portion 131, and the groove wall portion 132 surrounds the notch 133 along the circumference of the notch 133, and the groove wall portion 132 and the fixed plate portion 131 jointly surround the notch 133 to form the installation groove 116.

[0107] The notch 133 passes through opposite sides of the fixed plate portion 131. In this embodiment, the notch 133 is provided on the fixed plate portion 131, and cooperates with the groove wall portion 132 to form the installation groove 116, so that the installation groove 116 passes through opposite sides of the fixed plate portion 131, and the assembly opening 1162 is formed corresponding to the position of the notch 133 of the fixed plate portion 131, so that the assembly opening 1162 can pass through the fixed plate portion 131 and the groove wall portion 132. The assembly opening 1162 can extend from the inner side surface of the first side wall 1141 or the inner side surface of the second side wall 1142 into the accommodating cavity 115, which is conducive to the expansion beam 113 sliding into the installation groove 116 in contact with the inner wall surface of the first side wall 1141 or the second side wall 1142, thereby improving the assembly convenience of the expansion beam 113.

[0108] According to some embodiments of the present application, optionally, as shown in Figures 4 to 7, the side of the first side wall 1141 facing the accommodating cavity 115 or the side of the second side wall 1142 facing the accommodating cavity 115 is fitted and connected to the plate surface of the corresponding fixing plate portion 131.

[0109] That is, the fixing plate portion 131 of the mounting member 130 connected to the first side wall 1141 is in contact with the inner wall surface of the first side wall 1141 ; the fixing plate portion 131 of the mounting member 130 connected to the second side wall 1142 is in contact with the inner wall surface of the second side wall 1142 .

[0110] The plate surface of the fixing plate portion 131 is substantially parallel to the inner wall surface where it is located, so that the fixing plate portion 131 can be closely attached to the corresponding inner wall surface.

[0111] It can be understood that the fixed plate portion 131 is fitted and connected to the inner side surface of the corresponding side wall, specifically by gluing or welding. By fitting, the connection area between the fixed plate portion 131 and the inner side surface can be increased, thereby improving the connection stability of the mounting member 130 on the main body 114.

[0112] According to some embodiments of the present application, optionally, the fixing plate portion 131 and the slot wall plate portion 132 are an integral structure.

[0113] The fixing plate portion 131 and the groove wall plate portion 132 may be an integrally formed structure, for example, integrally formed by stamping; or they may be a structure connected as one body, specifically, they may be welded.

[0114] It can be understood that the fixed plate portion 131 and the groove wall portion 132 are an integrated structure, which can improve the connection stability between the fixed plate portion 131 and the groove wall portion 132, and further improve the stability of the connection between the expansion beam 113 and the body 114.

[0115] According to some embodiments of the present application, optionally, as shown in Figures 4 to 7, the main body 114 also includes a bottom wall 1145, the bottom wall 1145 is connected to the same end of the first side wall 1141 and the second side wall 1142, and the assembly port 1162 is set toward the side where the bottom wall 1145 is located, or the assembly port 1162 is set toward the side away from the bottom wall 1145.

[0116] The bottom wall 1145 may be connected to an end surface of the bottom end of the first side wall 1141 and an end surface of the bottom end of the second side wall 1142 .

[0117] In some implementations, the assembly opening 1162 is disposed toward the side where the bottom wall 1145 is located, that is, the assembly opening 1162 faces downward. When assembling the expansion beam 113, the expansion beam 113 can be inserted from the bottom opening of the frame into the mounting slot 116 from bottom to top through the assembly opening 1162. The assembly opening 1162 of the mounting slot 116 on the first side wall 1141 can be flush with the top of the first side wall 1141, and the assembly opening 1162 of the mounting slot 116 on the second side wall 1142 can be flush with the top of the second side wall 1142, so that the expansion beam 113 can be inserted into the mounting slot 116 from the top of the first side wall 1141 or the second side wall 1142 along the height direction Z1 of the body 114. The height direction Z1 of the body 114 is also the height direction Z1 of the battery case 110, which is perpendicular to the bottom wall 1145.

[0118] In other implementations, the assembly opening 1162 is disposed toward a side away from the bottom wall 1145, that is, the assembly opening 1162 is upwardly oriented. When assembling the expansion beam 113, the expansion beam 113 can be inserted from the top opening of the frame into the mounting groove 116 in a top-down direction through the assembly opening 1162. The assembly opening 1162 of the mounting groove 116 on the first side wall 1141 can be flush with the bottom end of the first side wall 1141, and the assembly opening 1162 of the mounting groove 116 on the second side wall 1142 can be flush with the bottom wall 1145 of the second side wall 1142, so that the expansion beam 113 can be inserted into the mounting groove 116 from the bottom end of the first side wall 1141 or the second side wall 1142 along the height direction Z1 of the battery case 110.

[0119] In the solution where the assembly opening 1162 is arranged toward the side where the bottom wall 1145 is located, when assembling the battery case 110, the frame can be assembled first, and then the expansion beam 113 can be assembled to the first side wall 1141 and the second side wall 1142 of the frame, and finally the bottom wall 1145. In this way, when assembling the expansion beam 113, the end of the frame facing the bottom wall 1145 is open, and the expansion beam 113 can slide smoothly into the assembly opening 1162 without interfering with the other side walls of the frame, making operation convenient.

[0120] According to some embodiments of the present application, optionally, as shown in Figures 4 to 7, and in combination with Figures 10 and 11, the mounting groove 116 is arranged at one end of the first side wall 1141 or the second side wall 1142 facing the bottom wall 1145, and the assembly port 1162 is arranged toward the side where the bottom wall 1145 is located, and the bottom wall 1145 covers the assembly port 1162.

[0121] Among them, the assembly opening 1162 of the installation groove 116 on the first side wall 1141 can be flush with the bottom end of the first side wall 1141, and the assembly opening 1162 of the installation groove 116 on the second side wall 1142 can be flush with the bottom wall 1145 of the second side wall 1142, so that the bottom wall 1145 can more conveniently cover the assembly opening 1162.

[0122] The bottom wall 1145 can be connected to the first side wall 1141 and the second side wall 1142 by welding. The bottom wall 1145 is also connected to the third side wall 1143 and the fourth side wall 1144 of the body 114 to seal the bottom end of the battery box 110.

[0123] It can be understood that the installation groove 116 is arranged close to the bottom wall 1145, and the assembly opening 1162 is arranged toward the side where the bottom wall 1145 is located. The expansion beam 113 can be directly inserted into the installation groove 116 through the assembly opening 1162 along the first side wall 1141 and the second side wall 1142 at one end close to the bottom wall 1145, thereby improving the assembly efficiency and convenience of the expansion beam 113. At the same time, the bottom wall 1145 covers the assembly opening 1162, which can have a certain limiting effect on the expansion beam 113 in the installation groove 116, thereby improving the installation stability of the expansion beam 113 in the installation groove 116.

[0124] According to some embodiments of the present application, optionally, the bottom wall 1145 is provided with a cooling structure.

[0125] The cooling structure is used to cool the battery cells 120, including but not limited to providing cooling channels within the bottom wall 1145. The cooling channels can be connected to a water cooling device. Cooling water flows through the cooling channels, exchanges heat with the bottom wall 1145, and thereby cools the battery cells 120 within the accommodating cavity 115 through the bottom wall 1145. In some implementations, the bottom wall 1145 can be a water-cooled plate structure.

[0126] It is understandable that the cooling structure provided on the bottom wall 1145 can cool the battery cells 120 . This has a simple structure and can improve the reliability of the battery box 110 .

[0127] According to some embodiments of the present application, optionally, the end 1131 of the expansion beam 113 is clamped in the mounting groove 116; and / or, the end 1131 of the expansion beam 113 is welded to the groove wall of the mounting groove 116; and / or, the end 1131 of the expansion beam 113 is connected to the groove wall of the mounting groove 116 via a fastener.

[0128] The clamping connection means that there is a certain fastening force between the end 1131 of the expansion beam 113 and the mounting groove 116, so that the expansion beam 113 can be fixed in the mounting groove 116. The fastener connection can be connecting the expansion beam 113 and the groove wall of the mounting groove 116 by means of bolts, rivets, etc.

[0129] One of welding, fastener connection and clamping can be selected to fix the expansion beam 113 in the installation groove 116, or two or three fastening methods can be used at the same time to fix the expansion beam 113 in the installation groove 116.

[0130] It is understandable that, based on the guidance and limitation of the installation groove 116 , further combining with methods such as clamping, welding or fasteners can improve the assembly stability of the expansion beam 113 and the body 114 .

[0131] According to some embodiments of the present application, optionally, referring to Figures 4 and 7, and in combination with Figures 12 to 15, Figure 12 is a schematic diagram of the expansion beam of some embodiments of the present application, Figure 13 is a cross-sectional schematic diagram of the end of the expansion beam of some embodiments of the present application being arranged in the mounting groove, Figure 14 is a schematic diagram of the expansion beam of some embodiments of the present application, and Figure 15 is a cross-sectional schematic diagram of the end of the expansion beam of some embodiments of the present application being arranged in the mounting groove; the end 1131 of the expansion beam 113 partially protrudes to form a protrusion 1132, and the protrusion 1132 is arranged in the mounting groove 116.

[0132] That is, the end portion 1131 of the expansion beam 113 may be partially disposed in the mounting groove 116, and the portion disposed in the mounting groove 116 may protrude relative to the rest of the end portion 1131. The protruding portion 1132 and the expansion beam 113 may be an integral structure.

[0133] It can be understood that by partially protruding the end 1131 to form the protrusion 1132, the size of the mounting groove 116 can be reduced compared to the manner in which the integral end 1131 is set in the mounting groove 116, thereby reducing the consumables for forming the mounting groove 116. In addition, compared to the integral end 1131, the protrusion 1132 has smaller sliding resistance in the mounting groove 116, thereby facilitating the assembly of the expansion beam 113.

[0134] According to some embodiments of the present application, optionally, with reference to Figures 4 to 15, the groove side wall 1163 of the mounting groove 116 includes a first wall 1164 and a second wall 1165, and the first wall 1164 and the second wall 1165 are respectively arranged on both sides of the assembly port 1162 along the first direction X2, and the first wall 1164 and the second wall 1165 extend along the direction Z2 of the assembly port 1162, and the first direction X2, the direction Z2 of the assembly port 1162 and the direction Y2 of the groove 1161 intersect each other.

[0135] The first direction X2, the direction Z2 of the assembly opening 1162, and the direction Y2 of the notch 1161 may be substantially perpendicular to each other.

[0136] The first wall 1164 and the second wall 1165 both extend along the assembly opening 1162 in the direction Z2. When the expansion beam 113 is inserted into the installation groove 116 through the assembly opening 1162, it can slide into the installation groove 116 along the first wall 1164 and the second wall 1165. The first wall 1164 and the second wall 1165 can play a good guiding role, thereby improving the assembly convenience of the expansion beam 113.

[0137] According to some embodiments of the present application, optionally, along the direction Z2 of the assembly opening 1162 , the first wall 1164 is gradually inclined away from the second wall 1165 ; and / or, along the direction Z2 of the assembly opening 1162 , the second wall 1165 is gradually inclined away from the first wall 1164 .

[0138] That is to say, the first side wall 1141 can be tilted so that the assembly opening 1162 forms a flared structure; the second wall 1165 can also be tilted so that the assembly opening 1162 forms a flared structure, which can facilitate the expansion beam 113 to be inserted into the assembly opening 1162 and inserted into the installation groove 116 along the assembly opening 1162.

[0139] According to some embodiments of the present application, optionally, the end 1131 of the expansion beam 113 partially protrudes to form a protrusion 1132, the protrusion 1132 is arranged in the installation groove 116, and along the first direction X2, the protrusion 1132 abuts between the first wall 1164 and the second wall 1165.

[0140] The protrusion 1132 abuts between the first wall 1164 and the second wall 1165, and the protrusion 1132 may abut both the first wall 1164 and the second wall 1165, so that the first wall 1164 and the second wall 1165 limit the movement of the protrusion 1132 in the first direction X2, thereby fixing the expansion beam 113 in the first direction X2 and improving the assembly stability of the expansion beam 113 and the main body 114.

[0141] It should be noted that when the first wall 1164 and the second wall 1165 are arranged at an angle, the protrusion 1132 of the expansion beam 113 can be set to an inclined structure matching the inclined first side wall 1141 or the second wall 1165 so that the protrusion 1132 can abut against the first wall 1164 and the second wall 1165.

[0142] According to some embodiments of the present application, optionally, the groove side wall 1163 of the mounting groove 116 also includes a third wall 1166, which is connected between the first wall 1164 and the second wall 1165, and along the direction Z2 of the assembly port 1162, the third wall 1166 is arranged opposite to the assembly port 1162, and the protrusion 1132 abuts against the third wall 1166.

[0143] The third wall 1166 can limit the protrusion 1132 from moving in the direction away from the assembly opening 1162 , which can not only improve the assembly stability of the expansion beam 113 and the body 114 , but also locate the installation position of the expansion beam 113 in the direction of the assembly opening 1162 .

[0144] According to some embodiments of the present application, optionally, along the direction Y2 of the notch 1161 , the bottom wall 1167 of the mounting groove 116 abuts against the protrusion 1132 .

[0145] The groove bottom wall 1167 can limit the movement of the expansion beam 113 along the extension direction of the expansion beam 113, thereby improving the assembly stability of the expansion beam 113 and the body 114. The extension direction of the expansion beam 113 is substantially consistent with the direction Y2 of the notch 1161.

[0146] According to some embodiments of the present application, as shown in Figures 4 and 6 , there are multiple expansion beams 113, which are spaced apart, and each expansion beam 113 has two ends connected to the first side wall 1141 and the second side wall 1142. At least one end of each expansion beam 113 is provided with a mounting groove 116.

[0147] Multiple expansion beams 113 can be spaced apart along the length direction X1 of the battery case 110. Battery cells 120 are positioned between adjacent expansion beams 113, so that both sides of the battery cells 120 can abut against the expansion beams 113 to protect the battery case 110. The first sidewall 1141 can be provided with an independent mounting slot 116 corresponding to each expansion beam 113, and the second sidewall 1142 can be provided with an independent mounting slot 116 corresponding to each expansion beam 113.

[0148] It can be understood that each expansion beam 113 is installed through its corresponding installation slot 116, which is easy to operate.

[0149] According to some embodiments of the present application, optionally, as shown in FIG. 4 and FIG. 6 , a loading connector 140 is provided on a side of the body 114 facing away from the accommodating cavity 115 .

[0150] The side of the body 114 facing away from the accommodating cavity 115 is referred to as the outer side of the body 114. For example, the side of the first sidewall 1141 facing away from the accommodating cavity 115 is referred to as the outer side of the first sidewall 1141. The loading connector 140 can be connected to the body 114 by welding or screwing. The loading connector 140 is used to secure the battery 100 to an electrical device, such as the chassis of the vehicle 1000. In some implementations, the loading connector 140 includes a connecting rod having one or more connecting holes. The connecting holes engage a bolt assembly to secure the loading connector 140 to the battery 100.

[0151] Specifically, a loading connector 140 may be provided on the side of the first sidewall 1141 facing away from the accommodating cavity 115, and a loading connector 140 may be provided on the side of the second sidewall 1142 facing away from the accommodating cavity 115. A loading connector 140 may also be provided on the side of the third sidewall 1143 or the fourth sidewall 1144 facing away from the accommodating cavity 115.

[0152] In this embodiment, by providing the loading connector 140 , the connection convenience between the battery box 110 and the electrical device can be improved, thereby improving the efficiency of assembling the battery 100 into the electrical device.

[0153] Some embodiments of the present application also provide a battery 100, including a battery cell 120 and a battery case 110. The battery case 110 is the battery case 110 proposed in the present application or any embodiment of the present application. The battery cell 120 is arranged in the accommodating cavity 115, and the battery cell 120 abuts against the expansion beam 113.

[0154] The number of the battery cells 120 may be one or more.

[0155] The battery 100 of this embodiment has the same beneficial effects as the battery case 110 provided in this application.

[0156] Some embodiments of the present application further provide an electrical device, comprising the battery 100 provided in the present application or any embodiment of the present application. The battery 100 can provide electrical energy to the electrical device.

[0157] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0158] The electrical device of this embodiment has the same beneficial effects as the battery box 110 proposed in this application or any embodiment of this application.

[0159] As shown in Figures 4 to 15, this embodiment provides a battery box 110, including a main body 114 and two expansion beams 113. A accommodating cavity 115 is formed in the main body 114. The main body 114 is roughly rectangular in shape, having a first side wall 1141 and a second side wall 1142 that are opposite and spaced apart. The main body 114 also includes a bottom wall 1145, which is connected to one end of the first side wall 1141 and the second side wall 1142. One of the two expansion beams 113 is the first expansion beam 1135, and the other is the second expansion beam 1135. The first expansion beam 1135 and the second expansion beam 1136 are arranged at intervals along the length direction X1 of the battery box 110. The first expansion beam 1135 and the second expansion beam 1136 both extend along the width direction Y1 of the battery box 110, and the two ends of the first expansion beam 1135 are connected to the inner side surface of the first side wall 1141 and the inner side surface of the second side wall 1142, and the two ends of the second expansion beam 1136 are also connected to the inner side surface of the first side wall 1141 and the inner side surface of the second side wall 1142.

[0160] The inner side surface of the first side wall 1141 corresponds to the first expansion beam 1135 and the second expansion beam 1136, respectively, and is connected to mounting members 130. The two connecting members on the first side wall 1141 are spaced apart along the length direction X1 of the battery case 110. The inner side surface of the second side wall 1142 corresponds to the first expansion beam 1135 and the second expansion beam 1136, respectively, and is also spaced apart along the length direction X1 of the battery case 110. Each mounting member 130 includes a fixed plate portion 131 and a groove wall portion 132. The fixed plate portion 131 is connected to the side of the first side wall 1141 facing the accommodating cavity 115 or the side of the second side wall 1142 facing the accommodating cavity 115. The groove wall portion 132 is connected to the side of the fixed plate portion 131 facing the accommodating cavity 115. A notch 133 is provided on the fixed plate portion 131, and the groove wall portion 132 is provided with a notch 133 along the circumference of the notch 133. 3. The groove wall portion 132 and the fixed plate portion 131 together define a notch 133 to form a mounting groove 116 with an assembly opening 1162 on one side. The notch 1161 of the mounting groove 116 faces the accommodating cavity 115. The bottom wall 1167 of the mounting groove 116 on the first side wall 1141 forms the inner wall surface of the first side wall 1141, while the bottom wall 1167 of the mounting groove 116 on the second side wall 1142 forms the inner wall surface of the second side wall 1142. Both ends of the two expansion beams 113 are disposed within the corresponding mounting grooves 116, and the end 1131 of each expansion beam 113 can be inserted into the mounting groove 116 through the assembly opening 1162 of the corresponding mounting groove 116. The assembly openings 1162 of the four mounting slots 116 all face the side where the bottom wall 1145 is located and are flush with the bottom ends of the first and second side walls 1141, 1142. The bottom wall 1145 covers all assembly openings 1162. The fixing plate 131 and the slot wall plate 132 of the same mounting member 130 are integrally structured, with each fixing plate 131 welded to the corresponding inner wall surface. A water cooling channel is provided on the bottom wall 1145.

[0161] The first expansion beam 1135 has a generally rectangular cross-section and a hollow interior. The first and second ends 1133 and 1134 of the first expansion beam 1135 each partially protrude to form a protrusion 1132. The protrusion 1132 extends upward from the top of the end 1131 and occupies approximately half the height of the end 1131 along the height direction Z1 of the battery case 110. The second expansion beam 1136 has a generally stepped cross-section. The first and second ends 1133 and 1134 of the second expansion beam 1136 each partially protrude to form a protrusion 1132. The protrusion 1132 extends upward from the top of the end 1131 and extends along the height direction Z1 of the battery case 110 from the bottom step of the end 1131 to within the range above the bottom step. Each protrusion 1132 is flush with the end portion 1131 where it is located in the longitudinal direction X1 of the battery case 110. Each mounting groove 116 has the same shape as the corresponding protrusion 1132. The protrusion 1132 is disposed in the corresponding mounting groove 116 and can be inserted into the mounting groove 116 through the corresponding assembly opening 1162. The groove side wall 1163 of the mounting groove 116 includes a first wall 1164, a second wall 1165 and a third wall 1166. The first wall 1164 and the second wall 1165 are respectively arranged on both sides of the assembly port 1162 along the first direction X2, and the first wall 1164 and the second wall 1165 both extend along the direction Z2 of the assembly port 1162. The first direction X2 is roughly understood with reference to the length direction X1 of the battery box 110. The direction Z2 of the assembly port 1162 can roughly refer to the height direction Z1 of the battery 100. The direction Y2 of the groove 1161 can refer to the width direction Y1 of the battery box 110. The third wall 1166 is connected between the first wall 1164 and the second wall 1165, and the third wall 1166 and the assembly port 1162 are arranged opposite to each other along the direction Z2 of the assembly port 1162, and the protrusion 1132 abuts against the third wall 1166 and the bottom wall 1145; along the first direction X2, the protrusion 1132 abuts between the first wall 1164 and the second wall 1165; along the direction Y2 of the slot 1161, the bottom wall 1167 of the mounting slot 116 abuts against the protrusion 1132.

[0162] A loading connector 140 may be provided on a side of the first sidewall 1141 facing away from the accommodating cavity 115 , and a loading connector 140 may be provided on a side of the second sidewall 1142 facing away from the accommodating cavity 115 .

[0163] When assembling the battery case 110 of this embodiment, the first side wall 1141, the second side wall 1142, the third side wall 1143, and the fourth side wall 1144 can be assembled to form a U-shaped frame, and then the various connectors can be assembled to the inner wall surfaces of the corresponding side walls. Then, the first expansion beam 1135 and the second expansion beam 1136 can be assembled into the mounting groove 116 from bottom to top, and finally, the bottom wall 1145 can be connected to the bottom end of the U-shaped frame. In this embodiment, the U-shaped frame and other structures of the battery case 110 will be deformed after connection (usually welding). The structure of the expansion beam 113 installed later can play a certain corrective role in the concave size of the frame.

[0164] After the battery case 110 of this embodiment is assembled, it forms a closed structure as shown in Figures 4, 5, and 10. In the height direction Z1 of the battery case 110, each expansion beam 113 is restrained and fixed by the third wall 1166 and bottom wall 1145 of its corresponding mounting groove 116. In the width direction Y1 of the battery case 110, each expansion beam 113 is restrained by the groove bottom wall 1167 on the first side wall 1141 and the second side wall 1142 at both ends. In the length direction X1 of the battery case 110, each expansion beam 113 is restrained by the first wall 1164 and the second wall 1165 at both ends, thereby achieving stable installation of the expansion beam 113. On this basis, welding, riveting, bolting, etc. can also be added to strengthen the fixing stability of the expansion beam 113 and the body 114.

[0165] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0166] Finally, it should be noted that 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, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. 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 claims and specification 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 claims.

Claims

1. A battery box, wherein: include: A body having a receiving cavity formed therein and having a first side wall and a second side wall opposite to and spaced apart from each other; an expansion beam, disposed in the accommodating cavity, with two ends of the expansion beam respectively connected to the first side wall and the second side wall; At least one of the first side wall and the second side wall is provided with a mounting groove on the side facing the accommodating cavity, the notch of the mounting groove faces the accommodating cavity, an assembly opening is provided on the groove side wall of the mounting groove, the assembly opening passes through the groove side wall toward one end of the notch, the end of the expansion beam is provided in the mounting groove at the corresponding end, and the end can be inserted into or removed from the corresponding mounting groove through the assembly opening.

2. The battery case according to claim 1, wherein: The side of the first side wall facing the accommodating cavity and the side of the second side wall facing the accommodating cavity are both provided with the mounting groove, and the orientation of the assembly port of the first side wall is the same as the orientation of the assembly port of the second side wall.

3. The battery case according to claim 1 or 2, wherein: The battery box also includes a mounting piece, at least one of the first side wall and the second side wall is connected to the side of the accommodating cavity with the mounting piece, the mounting piece is provided with the mounting groove, or the first side wall or the second side wall faces the side of the accommodating cavity and cooperates with the corresponding mounting piece to form the mounting groove.

4. The battery case according to claim 3, wherein: The mounting member includes a fixed plate portion and a groove wall plate portion, the first side wall facing the side of the accommodating cavity or the second side wall facing the side of the accommodating cavity is connected to the fixed plate portion, the groove wall plate portion is connected to the side of the fixed plate portion facing the accommodating cavity, and the groove wall plate portion at least surrounds and forms part of the mounting groove.

5. The battery case according to claim 4, wherein: The fixing plate portion is provided with a notch, the groove wall portion surrounds the notch along the circumference of the notch, and the groove wall portion and the fixing plate portion jointly surround the notch to form the installation groove.

6. The battery case according to claim 4 or 5, wherein: The side surface of the first side wall facing the accommodating cavity or the side surface of the second side wall facing the accommodating cavity is in close contact with the corresponding plate surface of the fixing plate portion.

7. The battery case according to any one of claims 4 to 6, wherein: The fixing plate portion and the groove wall plate portion are an integral structure.

8. The battery case according to any one of claims 1 to 7, wherein: The body further includes a bottom wall connected to the same end of the first side wall and the second side wall, and the assembly port is arranged toward the side where the bottom wall is located or the assembly port is arranged toward the side away from the bottom wall.

9. The battery case according to claim 8, wherein: The mounting groove is provided at one end of the first side wall or the second side wall facing the bottom wall, the assembly opening is provided towards the side where the bottom wall is located, and the bottom wall covers the assembly opening.

10. The battery case according to any one of claims 1 to 9, wherein: The end portion of the expansion beam is clamped in the mounting groove; And / or, the end portion of the expansion beam is welded to the groove wall of the installation groove; And / or, the end portion of the expansion beam is connected to the groove wall of the installation groove via a fastener.

11. The battery case according to any one of claims 1 to 10, wherein: The end portion of the expansion beam partially protrudes to form a protruding portion, and the protruding portion is disposed in the mounting groove.

12. The battery case according to any one of claims 1 to 11, wherein: The groove side walls of the mounting groove include a first wall and a second wall, the first wall and the second wall are respectively arranged on both sides of the assembly opening along the first direction, and the first wall and the second wall both extend along the direction of the assembly opening, and the first direction, the direction of the assembly opening and the direction of the groove intersect with each other.

13. The battery case according to claim 12, wherein: Along the direction of the assembly opening, the first wall is gradually inclined away from the second wall; And / or, along the direction of the assembly opening, the second wall is inclined gradually away from the first wall.

14. The battery case according to claim 12 or 13, wherein: The end portion of the expansion beam partially protrudes to form a protruding portion, the protruding portion is disposed in the mounting groove, and along the first direction, the protruding portion abuts between the first wall and the second wall.

15. The battery case according to claim 14, wherein: The groove side wall of the installation groove also includes a third wall, which is connected between the first wall and the second wall and arranged opposite to the assembly port along the direction of the assembly port, and the protrusion abuts against the third wall.

16. The battery case according to claim 14 or 15, wherein: Along the direction of the slot, the bottom wall of the mounting slot abuts against the protruding portion.

17. The battery case according to any one of claims 1 to 16, wherein: There are multiple expansion beams, which are arranged at intervals, and both ends of each expansion beam are respectively connected to the first side wall and the second side wall, and at least one end of each expansion beam is correspondingly provided with the installation groove.

18. The battery case according to any one of claims 1 to 17, wherein: A loading connector is provided on a side of the body facing away from the accommodating cavity.

19. A battery, wherein: include: The battery case according to any one of claims 1 to 18; A battery cell is disposed in the accommodating cavity, and the battery cell abuts against the expansion beam.

20. An electrical device, wherein: Including the battery according to claim 19.

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