Battery pack and electric device

Abstract

The present application relates to a battery pack and an electric device. The battery pack comprises a housing assembly, a battery cell module and mounting assemblies. Together with a front end plate and a rear end plate, a middle end plate can provide strong support for each single row of battery cells from a middle position, thereby improving the structural stability of the battery cell module. When the battery pack is mounted to an electric device, hanging bolts can be passed through hanging holes of hanging sleeves and locked. The mounting assemblies are located in the middle of the battery pack, so that middle support can be increased during hanging, thereby improving the mechanical strength of the battery pack. Moreover, the hanging sleeves use the space where the middle end plate is located, and thus, the mounting assemblies can be arranged in the middle of the battery pack without additionally occupying the space in the housing assembly. Thus, according to the battery pack, the volume utilization rate can also be improved.

Description

Battery packs and power devices Technical Field

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

[0002] As new energy vehicles become increasingly popular, demands for battery pack capacity and vehicle range continue to rise, leading to an increase in battery pack size. To ensure mechanical strength, a mounting structure is required in the center of the battery pack. However, this mounting structure takes up space within the battery housing, reducing the battery pack's volume utilization.

[0003] Application Contents

[0004] According to various embodiments of the present application, a battery pack and an electrical device are provided.

[0005] A battery pack, comprising:

[0006] a housing assembly, wherein a receiving cavity is formed in the housing assembly;

[0007] A battery cell module is accommodated in the accommodating cavity, wherein the battery cell module includes a single-row battery cell, and each of the single-row battery cells is provided with a front end plate and a rear end plate at both ends in the length direction, and at least one middle end plate is provided between the front end plate and the rear end plate; and

[0008] The mounting assembly includes a lifting sleeve, which is passed through and fixed to the outer shell assembly and the middle end plate, and a lifting hole for a lifting bolt to pass through is formed along the axial direction of the lifting sleeve.

[0009] An electrical device includes the battery pack as described in the above preferred embodiment.

[0010] The details of one or more embodiments of the present application are set forth in the following drawings and description. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0012] FIG1 is an exploded view of a battery pack in a preferred embodiment of the present invention;

[0013] FIG2 is a schematic diagram of a portion of the structure of the battery pack shown in FIG1 after the cell module and the housing assembly are assembled;

[0014] FIG3 is a schematic structural diagram of the middle end plate of the battery module shown in FIG2 ;

[0015] FIG4 is a top view of the assembled battery pack shown in FIG1 ;

[0016] FIG5 is a cross-sectional view of the battery pack shown in FIG4 along line AA;

[0017] FIG6 is an enlarged schematic diagram of a portion B in the cross-sectional view of the battery pack shown in FIG5 ;

[0018] FIG7 is a schematic structural diagram of the upper sleeve of the battery pack shown in FIG1 ;

[0019] FIG8 is a schematic structural diagram of the lower sleeve of the battery pack shown in FIG1 ;

[0020] FIG9 is a schematic structural diagram of a single battery cell module shown in FIG2 ;

[0021] FIG10 is a cross-sectional view of the battery cell module shown in FIG9 along CC;

[0022] FIG11 is an enlarged schematic diagram of a portion D in the battery module shown in FIG10 ;

[0023] FIG12 is a schematic structural diagram of the reinforcing plate in the side cooling plate shown in FIG9 . DETAILED DESCRIPTION

[0024] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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 should not be understood as a limitation on the present application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0027] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0028] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0030] The present invention discloses an electrical device and a battery pack. The electrical device includes the battery pack and is capable of being powered by the battery pack. The battery pack can be used individually or by combining multiple battery packs in parallel, series, or a combination of parallel and series to form a larger battery pack.

[0031] The aforementioned electrical devices may include vehicles, ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. Energy storage equipment may include energy storage walls, base station energy storage, container energy storage, etc. Amusement equipment may include carousels, bungee jumping machines, etc.

[0032] This application does not impose any special restrictions on the above-mentioned power-consuming device. For new energy vehicles, the above-mentioned battery pack can be used as a driving power source, thereby replacing fossil fuels to provide driving power.

[0033] Referring to FIG. 1 , a battery pack 10 in a preferred embodiment of the present invention includes a housing assembly 100 , a mounting assembly 200 , and a cell module 300 .

[0034] A housing cavity for accommodating the battery module 300 is formed in the housing assembly 100, and its outer contour can be square, circular, or other shapes that are compatible with the battery compartment of the electrical device. According to actual needs, the housing assembly 100 can be set to a closed, semi-closed, or other structure, and can be assembled from multiple parts. Specifically, in this embodiment, the housing assembly 100 includes a top cover 110, a middle frame 120, and a bottom cover 130. The middle frame 120 is annular, and the top cover 110 and the bottom cover 130 are respectively installed on opposite sides of the middle frame 120, thereby forming a housing cavity between the three.

[0035] The top cover 110 and bottom cover 130 can be assembled with the middle frame 120 by bolting, clamping, riveting, or welding. Furthermore, the three can be assembled together using a mounting assembly 200, the specific assembly method of which will be described in detail later. Sealing rubber rings (not shown) can also be provided along the edges of the top cover 110 and bottom cover 130. These sealing rubber rings abut against the edges of the middle frame 120 on opposite sides, thereby ensuring that the housing assembly 100 has an excellent sealing performance.

[0036] The cell module 300 is the core component of the battery pack 10. It contains multiple battery cells and is used to store and release electrical energy. A battery pack 10 can contain one or more cell modules 300. To achieve a larger battery capacity, multiple cell modules 300 are typically installed in the battery pack 10, with multiple cell modules 300 arranged side by side within the storage cavity.

[0037] Please refer to FIG. 2 and FIG. 9 together. The battery cell module 300 includes a single-row battery cell 320 , a front end plate 330 , a rear end plate 340 and a middle end plate 350 .

[0038] The single-row battery cells 320 include multiple battery cells arranged in parallel. The battery cells can be lithium-ion batteries and can be cylindrical or rectangular in shape. The battery cells in this embodiment are rectangular lithium-ion batteries, with the large surfaces of the multiple battery cells arranged in sequence. Each battery cell module 300 may include one or more single-row battery cells 320. Each single-row battery cell 320 is provided with a front end plate 330 and a rear end plate 340 at both ends in the longitudinal direction, and at least one middle end plate 350 is provided between the front end plate 330 and the rear end plate 340. The front end plate 330 and the rear end plate 340 can have the same structure and are used to clamp the multiple battery cells therebetween. Each middle end plate 350 is arranged between two adjacent battery cells. The middle end plate 350, in conjunction with the front end plate 330 and the rear end plate 340, can provide strong support for each single-row battery cell 320 from a central position, thereby improving the structural stability of the battery cell module 300.

[0039] Referring also to Figure 3 , in this embodiment, a plurality of cavity structures 351 are formed within the central end plate 350. As can be seen, the central end plate 350 is not a solid structure. This saves material and reduces the weight of the central end plate 350, facilitating a lightweight design for the battery pack 10. Furthermore, when the cells in the single-row battery cells 320 expand and deform, the cavity structures 351 are compressed, absorbing some of the deformation and preventing significant deformation of the entire cell module 300.

[0040] In order to improve the supporting effect of the middle end plate 350 , specifically in this embodiment, a plurality of middle end plates 350 are provided in a single row of battery cells 320 , and the distance between two adjacent middle end plates 350 is 400 mm to 800 mm.

[0041] In addition, in this embodiment, the battery cell module 300 includes multiple side cold plates 310, which are arranged at intervals and form a receiving groove between two adjacent side cold plates 310. The single-row battery cells 320 are arranged in the receiving groove and thermally cooperate with the side cold plates 310.

[0042] The side cold plate 310 is provided with a cooling channel inside, through which the coolant can flow. The side cold plate 310 is in the shape of an elongated strip, which is consistent with the extension direction of the single-row battery cell 320. A single-row battery cell 320 is provided in each accommodating groove, which is thermally coordinated with the side cold plate 310. Thermal coordination means that heat exchange can be carried out between the single-row battery cell 320 and the side cold plate 310. The single-row battery cell 320 and the side cold plate 310 can achieve thermal coordination by direct contact, or by thermally conductive components such as thermal adhesive and the side cold plate 310.

[0043] It can be seen that the two side surfaces of each cell unit adjacent to the large surface in the single-row battery cells 320 can exchange heat with the side cold plate 310, so the area for heat exchange between the cell unit and the side cold plate 310 is larger, thereby making the battery cell module 300 dissipate heat faster and having a better cooling effect on the battery pack 10.

[0044] Furthermore, the front end plate 330, rear end plate 340, and middle end plate 350 of each single-row battery cell 320 are fixedly connected to the side cold plates 310 on both sides of the single-row battery cell 320. This creates a more stable overall structure for the battery cell module 300. The middle end plate 350 not only provides strong support in the center, but also cooperates with the side cold plates 310 to position the multiple battery cells in the single-row battery cell 320, preventing some cells from bulging or sinking, thereby effectively controlling the flatness of the large surface of the battery cell module 300.

[0045] The side cold plate 310 can be fixedly connected to the front plate 330, the rear plate 340, and the middle plate 350 by riveting. Riveting is more convenient and has a simpler structure, which helps reduce the weight of the battery module 300 and improve space utilization.

[0046] Obviously, in other embodiments, the side cold plate 310 may be omitted. In this case, the plurality of battery cells in the single row of battery cells 320 may be fixed to the front end plate 330 , the rear end plate 340 and the middle end plate 350 by cable ties.

[0047] Please refer to FIG. 10 , FIG. 11 and FIG. 12 . In this embodiment, the side cold plate 310 includes a cooling cover plate 311 , a flow channel plate 312 and a reinforcing plate 313 .

[0048] The cooling cover plate 311 and the flow channel plate 312 are of roughly the same shape and are both metal plates. Specifically, in this embodiment, the cooling cover plate 311 and the flow channel plate 312 are both aluminum plates. Aluminum plates are relatively soft, making it easier to form cooling channels through stamping.

[0049] A stamped groove 3121 is formed on one side of the flow channel plate 312, and a rib 3122 is formed on the other side at a position corresponding to the stamped groove 3121. Specifically, the stamped groove 3121 and the rib 3122 can be formed simultaneously by stamping, with the stamped groove 3121 formed on the concave side of the flow channel plate 312 and the rib 3122 formed on the convex side. The stamped groove 3121 can be S-shaped, U-shaped, or other shapes.

[0050] The cooling cover plate 311 is positioned over the side of the flow plate 312 where the stamped groove 3121 is formed. It cooperates with the stamped groove 3121 to form the cooling channel (not shown) for the side cold plate 310. The cooling cover plate 311 covers the stamped groove 3121, thereby sealing it and forming the cooling channel. Specifically, in this embodiment, the cooling cover plate 311 is brazed to the flow plate 312. This provides a more secure connection between the cooling cover plate 311 and the flow plate 312, and eliminates the need for additional drilling or other operations.

[0051] In this embodiment, the stamped area where the stamped grooves 3121 are located is located in the center of the flow channel plate 312. The welded area between the cooling cover plate 311 and the flow channel plate 312 is arranged along the circumference of the stamped area. Because the stamped area is located in the center, the resulting cooling channel is located in the center of the side cold plate 310. Furthermore, the welded area is arranged along the stamped area, i.e., the circumference of the cooling channel, ensuring the cooling channel's tightness.

[0052] The reinforcing plate 313 is attached to the side of the flow channel plate 312 where the ribs 3122 are formed, and provides a clearance for the ribs 3122. Specifically, the reinforcing plate 313 may include a hollow portion 3131, with the ribs 3122 located within the hollow portion 3131. Alternatively, the reinforcing plate 313 may be a separate plate-like structure comprising multiple independent sub-plates (not shown), with the sub-plates distributed in the gaps between the ribs 3122. The reinforcing plate 313 may be connected to the flow channel plate 312 by bonding, welding, or other methods.

[0053] Specifically, in this embodiment, the reinforcing plate 313 is bonded to the surface of the flow channel plate 312. This bonding method does not significantly increase the thickness of the side cold plate 310, thereby improving space utilization. Furthermore, bonding is simpler than welding and other processes.

[0054] The reinforcing plates 313 provide support and position limiting functions. When the side cold plate 310 is squeezed, the reinforcing plates 313 contact the single-row battery cells 320 on either side, preventing the ribs 3122 from caving inward due to excessive compression and damaging the cooling channels. This significantly enhances the side cold plate 310's compressive strength, significantly improving the reliability of the battery pack 10.

[0055] In this embodiment, the thickness of the reinforcing plate 313 is not less than the height of the rib 3122. In other words, the surface of the reinforcing plate 313 can be flush with or slightly higher than the top of the rib 3122. In this way, the reinforcing plate 313 can better protect the rib 3122.

[0056] Correspondingly, the ribs 3122 are also distributed in the stamping area. Furthermore, the reinforcing plate 313 in this embodiment is annular and extends circumferentially along the stamping area. A hollow portion 3131 is formed in the middle of the reinforcing plate 313, and the ribs 3122 are located within the hollow portion 3131. Because the annular reinforcing plate 313 provides uniform support, and the ribs 3122 are located within the reinforcing plate 313, the reinforcing plate 313 further enhances the protective effect of the ribs 3122.

[0057] Specifically, the side cold plate 310 is provided with rivet holes 101 that penetrate the cooling cover plate 311, the flow channel plate 312, and the reinforcement plate 313. These holes 101 facilitate riveting the side cold plate 310 to the front plate 330, the rear plate 340, and the middle plate 350, thus facilitating installation. Obviously, the rivet holes 101 should be positioned away from the cooling channels.

[0058] Furthermore, in this embodiment, a bottom cooling plate (not shown) is provided on the bottom wall of the housing assembly 100, and the battery cell module 300 cooperates with the bottom cooling plate for thermal conductivity. Similarly, a cooling channel for coolant to flow through is formed inside the bottom cooling plate, which can remove heat. Thus, the bottom surface of each cell in the single-row battery cell 320 can also exchange heat with the bottom cooling plate, thereby further increasing the heat dissipation area of ​​the cell, thereby further improving the heat dissipation effect of the battery cell module 300.

[0059] Specifically, the bottom cooling plate can be installed on the bottom cover 130 of the housing assembly 100 by welding or other methods. The single-row battery cells 320 can directly contact the bottom cooling plate to achieve thermal coordination, or can achieve thermal coordination with the bottom cooling plate through thermal conductive components such as thermal conductive glue.

[0060] Furthermore, in this embodiment, the water inlet and outlet of the side cooling plate 310 are located at the same end along its length, and at the same end of the receiving tank as the water inlet and outlet of the bottom cooling plate. Coolant flowing out of the water outlet of the side cooling plate 310 can enter the cooling channel of the plate cooling plate through the water inlet of the bottom cooling plate, thereby enabling coolant exchange between the bottom cooling plate and the side cooling plate 310. Furthermore, since the water inlet and outlet to be connected are located at the same end, the distance between them is shorter, making connection more convenient and also contributing to space conservation.

[0061] Referring to Figures 4, 5, and 6, the mounting assembly 200 includes a hoisting sleeve 200A. The hoisting sleeve 200A is a hollow structure, typically formed from a high-strength metal. The hoisting sleeve 200A is inserted through and secured to the housing assembly 100 and the central end plate 350. A hoisting hole (not shown) is formed along the axial direction of the hoisting sleeve 200A for the passage of a hoisting bolt.

[0062] When the battery pack 10 is assembled on an electrical device, such as a new energy vehicle, the lifting bolts on the electrical device can be passed through the lifting holes of the lifting sleeve 200A and locked. Since the mounting assembly 200 is located in the middle of the battery pack, the middle support of the battery pack 10 can be increased during lifting. In this way, the battery pack 10 is not easily deformed, which helps to improve the mechanical strength of the battery pack 10. Moreover, the lifting sleeve 200A utilizes the space where the middle end plate 350 is located, that is, the setting of the lifting sleeve 200A does not occupy additional space in the length and width directions of the battery cell module 200. Therefore, the setting of the mounting assembly 200 will not result in a reduction in the space inside the outer shell assembly 10, so the volume utilization rate of the battery pack 10 can be improved.

[0063] Furthermore, the hoisting sleeve 200A passes through the middle of the middle end plate 350, effectively avoiding obstruction of the cell terminals. This allows the copper busbars used to electrically connect the cells in the single-row battery cells 320 to be smoothly routed across the top of the cell module 300, reducing assembly complexity.

[0064] Multiple mounting structures 200 may be provided, and the multiple mounting structures 200 are generally spaced apart along the extending direction of the middle end plate 350. In this way, multiple hanging bolts may be used to assemble the battery pack 10, and the battery pack 10 may be hung more firmly.

[0065] Please refer to Figure 1 and Figure 6 again. In this embodiment, a beam 121 is set in the accommodating cavity of the housing component 100, the middle end plate 350 is supported by the beam 121, and the hanging sleeve 200A passes through the beam 121 to fix the middle end plate 350 on the beam 121.

[0066] Crossbeam 121 is used to reinforce the structural strength of housing assembly 100, thereby further enhancing the mechanical strength of battery pack 10. Specifically, crossbeam 121 is disposed on midframe 120, with its ends connected to two opposing sides of midframe 120. Crossbeam 121 and the rest of midframe 120 can be integrally formed or assembled by welding. Crossbeam 121 utilizes a short beam structure, with its height being less than that of midframe 120.

[0067] The stacked middle end plate 350 and crossbeam 121 function as a conventional crossbeam structure, providing stronger lateral support within the housing cavity and enhancing the structural strength. Furthermore, the middle end plate 350 and crossbeam 121 share space in the depth direction of the housing assembly 100, thus avoiding the reduction in volume utilization caused by the additional space occupied by crossbeam 121.

[0068] It should be noted that, in other embodiments, the position of the middle end plate 350 can be adjusted along the arrangement direction of the single-row battery cells 320 , and does not have to be stacked with the crossbeam 121 .

[0069] Furthermore, when the lifting bolt passes through the lifting hole of the lifting sleeve 200A, it can sequentially penetrate the middle end plate 350 and the crossbeam 121, and the lifting sleeve 200A is fixed to the housing assembly 110 and the middle end plate 350. Therefore, the battery pack 10 can be subjected to the force as a whole during lifting, which also helps to improve the stability of the lifting.

[0070] Furthermore, in this embodiment, a longitudinal beam 122 is formed within the housing cavity of the housing assembly 110, perpendicular to the transverse beam 121. Similarly, the longitudinal beam 122 can also be provided on the midframe 120. The longitudinal beam 122 is positioned between two adjacent battery cell modules 300, and, in conjunction with the transverse beam 121, further strengthens the structural strength of the housing assembly 100, thereby enhancing the overall mechanical strength of the battery pack 10. The height of the longitudinal beam 122 is generally consistent with that of the frame 120, but greater than that of the transverse beam 121.

[0071] Referring to Figures 7 and 8 , in this embodiment, the lifting sleeve 200A comprises an upper sleeve 210 and a lower sleeve 220. Both the upper sleeve 210 and the lower sleeve 220 are hollow structures with openings at both ends, and their axial through-holes together constitute the aforementioned lifting hole. The upper sleeve 210 is disposed through the top wall of the housing assembly 100 and has an upper flange 211 formed thereon that abuts against the side of the middle end plate 350 facing the top wall of the housing assembly 100.

[0072] Furthermore, the lower sleeve 220 is disposed through the bottom wall of the housing assembly 100. The lower sleeve 220 is formed with a lower flange 221 that abuts against the side of the housing assembly 100 facing away from the battery module 300. The lower sleeve 220 is connected to the upper sleeve 210 so that the middle end plate 350 is clamped between the upper flange 211 and the lower flange 221, thereby pressing the middle end plate 350 against the housing assembly 100.

[0073] Specifically, the top wall of the housing assembly 100 is the top cover 110, and one end of the upper sleeve 210 extends outward from the outside of the top cover 110 (the side facing away from the accommodating cavity). The bottom wall of the housing assembly 100 is the bottom cover 130, and one end of the lower sleeve 220 extends outward from the bottom cover 130. The upper flange 211 and the lower flange 221 are both annular and extend circumferentially along the upper sleeve 210 and the lower sleeve 220, respectively. In this embodiment, the lower flange 221 can abut against the middle frame 120, more specifically, against the side of the crossbeam 121 facing away from the battery cell module 300. Of course, the lower flange 221 can also abut against the side of the bottom cover 130 facing away from the battery cell module 300, which is not limited here.

[0074] After the lower sleeve 220 and the upper sleeve 210 are connected, a tensile force is generated between them. This tensile force is transmitted to the upper flange 211 and the lower flange 221, causing the upper flange 211 to exert downward pressure on the middle end plate 350, and the lower flange 221 to exert upward pressure on the housing assembly 100. In this way, the middle end plate 350 and the housing assembly 100 are clamped between the upper flange 211 and the lower flange 221, thereby fixing the mounting assembly 120 to the housing assembly 100 and the middle end plate 350, and fixing the battery cell module 300 in the accommodating cavity.

[0075] In this embodiment, the upper sleeve 210 and the lower sleeve 220 are connected by threading. Specifically, internal and external threads can be provided on the opposing ends of the upper sleeve 210 and the lower sleeve 220 to achieve threaded connection. More specifically, the lower sleeve 220 is provided with external threads, and the upper sleeve 210 is provided with internal threads. The lower sleeve 220 passes through the middle end plate 350 and extends into the upper sleeve 210 to achieve threaded connection.

[0076] By controlling the degree of mutual threading between the upper sleeve 210 and the lower sleeve 220, a relative pre-tightening force can be generated between the upper flange 211 and the lower flange 221, so that the upper flange 211 and the lower flange 221 can be more reliably tightened against the middle end plate 350 and the shell assembly 100, ensuring the reliability of the installation.

[0077] Obviously, in other embodiments, the upper sleeve 210 and the lower sleeve 220 may also be connected by means of snap-fitting, welding, etc.

[0078] As can be seen, by dividing the mounting sleeve 200A into two parts, the upper sleeve 210 and the lower sleeve 220 respectively function as a conventional nut and bolt. This eliminates the need for additional fasteners when securing the mounting assembly 120 to the housing assembly 100, and also eliminates the need for additional fasteners to secure the cell module 300 within the housing. This reduces the number of components while also lowering assembly difficulty and cost.

[0079] It should be pointed out that in other embodiments, the lifting sleeve 200A can also be set as an integral cylindrical structure that passes through the outer shell assembly 100 and the middle end plate 350, and its two ends are locked with nuts to achieve installation with the outer shell assembly 100 and fix the battery cell module 300 in the accommodating cavity.

[0080] Referring again to Figures 6 and 7 , in this embodiment, the middle end plate 350 defines a stepped hole 352 for the lifting sleeve 200A to pass through, and the upper flange 211 abuts against the step of the stepped hole 352. Because the upper flange 211 is received within the stepped hole 352, it does not protrude from the surface of the middle end plate 350, thereby ensuring the smoothness of the surface of the battery cell module 300.

[0081] In addition, in this embodiment, the mounting structure 200 further includes a sealing ring 230 and a locking nut 240. The upper sleeve 210 is formed with an upper sealing ring 212. The sealing ring 230 is sleeved on the upper sleeve 210 and positioned between the upper sealing ring 212 and the top wall of the housing assembly 100. The locking nut 240 is threadedly engaged with the end of the upper sleeve 210 extending from the housing assembly 100 to clamp the sealing ring 230 between the upper sealing ring 212 and the top wall of the housing assembly 100.

[0082] The sealing ring 230 between the upper sealing ring 212 and the top wall of the housing assembly 100 is squeezed and deformed by the locking nut 240, thereby filling the gap between the top wall of the housing assembly 100 and the upper sleeve 210 and providing a seal. To facilitate the installation of the sealing ring 230, a sealing groove is formed on the surface of the upper sealing ring 212 to accommodate the sealing ring 230.

[0083] Furthermore, the lower sleeve 220 is formed with a lower sealing ring 222, and the sealing ring 230 is sleeved on the lower sleeve 220 and located between the lower sealing ring 222 and the bottom wall of the shell assembly 100. The locking nut 240 is screwed into one end of the lower sleeve 220 extending out of the shell assembly 100 to clamp the sealing ring 230 between the lower sealing ring 222 and the bottom wall of the shell assembly 100.

[0084] To facilitate the installation of sealing ring 230, a sealing groove is also formed on the surface of lower sealing ring 222 to accommodate sealing ring 230. The sealing ring 230 between lower sealing ring 222 and the bottom wall of housing assembly 100 is squeezed and deformed by locking nut 240, thereby filling the gap between the bottom wall of housing assembly 100 and lower sleeve 220. By cooperating with sealing ring 230 between upper sealing ring 212 and the top wall of housing assembly 100, a good seal is achieved throughout the entire package.

[0085] Specifically, the top wall of the housing assembly 100 is the top cover 110, and the bottom wall of the housing assembly 100 is the bottom cover 130. When assembling the battery pack 10, the cell module 300 is first fixed to the middle frame 120 through the upper sleeve 210 and the lower sleeve 220. The top cover 110 is then placed over one side of the middle frame 120, and the end of the upper sleeve 210 is passed through the mounting hole reserved in the top cover 110. Next, the locking nut 240 is tightened on the end of the upper sleeve 210 that extends out of the top cover 110. The locking nut 240 not only compresses the sealing ring 230, but also presses the top cover 110 against the middle frame 120.

[0086] Similarly, the bottom cover 130 is installed in the same manner. Furthermore, a locking nut 240 is tightened on the end of the lower sleeve 220 that extends beyond the bottom cover 120. This tightens the sealing ring 230 while also pressing the bottom cover 130 against the middle frame 120. This is how the top cover 110, middle frame 120, and bottom cover 130 are assembled using the mounting assembly 200, as described above.

[0087] Furthermore, in this embodiment, the lower flange 221 is configured as a lower sealing ring 222. That is, one side of the lower flange 221 is used to compress the sealing ring 230, while the other side is used to abut against the housing assembly 100, specifically the side of the crossbeam 110 facing away from the cell module 300, thereby providing tension to secure the cell module 300. This simplifies the structure of the lower sleeve 220.

[0088] It should be noted that in other embodiments, the upper flange 211 can also be configured as an upper sealing ring 212. That is, one side of the upper flange 211 is used to press the sealing ring 23, and the other side is used to abut against the surface of the battery module 300, thereby cooperating with the lower flange 221 to fix the battery module 300.

[0089] The battery pack 10, in conjunction with the front end plate 330 and the rear end plate 340, the middle end plate 350 can provide strong support for each single-row battery cell 320 from the middle position, thereby improving the structural stability of the battery cell module 300. When the battery pack 10 is assembled on an electrical device, the lifting bolts can be passed through the lifting holes of the lifting sleeve 200A and locked. The mounting assembly 200 is located in the middle of the battery pack 10, so it can increase the middle support during lifting, which helps to improve the mechanical strength of the battery pack 10. Moreover, since the lifting sleeve 200A utilizes the space where the middle end plate 350 is located, there is no need to occupy additional space in the outer shell assembly 100 when the mounting assembly 200 is set in the middle of the battery pack 10. Therefore, the battery pack 10 can also improve the volume utilization rate.

[0090] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery pack, characterized in that: include: a housing assembly, wherein a receiving cavity is formed in the housing assembly; A battery cell module is accommodated in the accommodating cavity, wherein the battery cell module includes a single-row battery cell, and each of the single-row battery cells is provided with a front end plate and a rear end plate at both ends in the length direction, and at least one middle end plate is provided between the front end plate and the rear end plate; and The mounting assembly includes a lifting sleeve, which is passed through and fixed to the outer shell assembly and the middle end plate, and a lifting hole for a lifting bolt to pass through is formed along the axial direction of the lifting sleeve.

2. The battery pack according to claim 1, wherein: A crossbeam is provided in the accommodating cavity, the middle end plate is supported by the crossbeam, and the lifting sleeve passes through the crossbeam to fix the middle end plate on the crossbeam.

3. The battery pack according to claim 2, wherein: A longitudinal beam perpendicular to the cross beam is also formed in the accommodating cavity, and the longitudinal beam is located between two adjacent battery core modules.

4. The battery pack according to claim 1, wherein: A plurality of the middle end plates are provided in each of the single-row battery cells, and the distance between two adjacent middle end plates is 400 mm to 800 mm.

5. The battery pack according to claim 1, wherein: The battery cell module includes a plurality of side cold plates, which are arranged at intervals and form a receiving groove between two adjacent side cold plates. The single-row battery cells are arranged in the receiving groove and thermally cooperate with the side cold plates.

6. The battery pack according to claim 5, characterized in that: The front end plate, the rear end plate and the middle end plate of each of the single-row battery cells are fixedly connected to the side cold plates on both sides of the single-row battery cells.

7. The battery pack according to claim 5, characterized in that: The bottom wall of the housing assembly is provided with a bottom cooling plate, the battery core module is thermally matched with the bottom cooling plate, and the cooling channel of the bottom cooling plate is connected with the cooling channel of the side cooling plate.

8. The battery pack according to claim 7, characterized in that: The water inlet and the water outlet of the side cooling plate are located at the same end in the length direction of the side cooling plate, and are located at the same end of the accommodating tank as the water inlet and the water outlet of the bottom cooling plate.

9. The battery pack according to claim 5, characterized in that: The side cold plate includes a cooling cover plate, a flow channel plate and a reinforcement plate. A stamping groove is formed on one side of the flow channel plate, and a rib is formed on the other side at a position corresponding to the stamping groove. The cooling cover plate is covered on the side of the flow channel plate where the stamping groove is formed, and cooperates with the stamping groove to form a cooling flow channel. The reinforcement plate is attached to the side of the flow channel plate where the rib is formed and forms a avoidance position for the rib.

10. The battery pack according to claim 9, characterized in that: The cooling cover plate is welded to the flow channel plate by brazing.

11. The side cold plate according to claim 10, characterized in that: The stamping area where the stamping groove is located is located in the middle of the flow channel plate, and the welding area between the cooling cover plate and the flow channel plate is arranged along the circumference of the stamping area.

12. The battery pack according to claim 9, wherein: The thickness of the reinforcing plate is not less than the height of the rib.

13. The battery pack according to claim 9, wherein: The stamping area where the ribs are located is located in the middle of the flow channel plate, and the reinforcing plate is annular and extends along the circumference of the stamping area.

14. The battery pack according to claim 1, wherein: A plurality of cavity structures are formed in the middle end plate.

15. The battery pack according to claim 1, wherein: The lifting sleeve includes an upper sleeve and a lower sleeve, the upper sleeve is passed through the top wall of the shell assembly, and the upper sleeve is formed with an upper flange that abuts against the side of the middle end plate facing the top wall of the shell assembly, the lower sleeve is passed through the bottom wall of the shell assembly, and the lower sleeve is formed with a lower flange that abuts against the side of the shell assembly facing away from the battery cell module, the lower sleeve is connected to the upper sleeve so that the middle end plate is clamped between the upper flange and the lower flange, and the middle end plate is pressed against the shell assembly.

16. The battery pack according to claim 15, characterized in that: The middle end plate is provided with a stepped hole for the lifting sleeve to pass through, and the upper flange abuts against the step of the stepped hole.

17. The battery pack according to claim 15, characterized in that: The upper sleeve and the lower sleeve are connected to each other by screwing.

18. The battery pack according to claim 15, characterized in that: The mounting structure further includes a sealing ring and a locking nut; the upper sleeve is formed with an upper sealing ring, the sealing ring is sleeved on the upper sleeve and located between the upper sealing ring and the top wall of the housing assembly, and the locking nut is threadedly engaged with an end of the upper sleeve extending from the housing assembly to clamp the sealing ring between the upper sealing ring and the top wall of the housing assembly; The lower sleeve is formed with a lower sealing ring, which is sleeved on the lower sleeve and located between the lower sealing ring and the bottom wall of the shell assembly. The locking nut is screwed into one end of the lower sleeve extending out of the shell assembly to clamp the sealing ring between the lower sealing ring and the bottom wall of the shell assembly.

19. The battery pack according to claim 18, wherein: The lower flange is configured as the lower sealing ring.

20. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 19.

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