Battery pack and vehicle

Abstract

The utility model provides a battery pack and a vehicle. The battery pack comprises a box body and a cross beam, the box body is provided with a containing space and a mounting hole which are communicated; and the cross beams are fixedly connected with the box body and installed in the containing space, and part of the cross beams are arranged in the installation holes and used for being connected with a vehicle frame so that the battery pack can be loaded on the vehicle frame. According to the battery pack provided by the utility model, the force transmission path is reduced, and the strength of the box body is enhanced, so that the fatigue resistance of the battery pack is better.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, specifically to a battery pack and a vehicle. Background Technology

[0002] The battery pack is one of the core components of a new energy vehicle. When the battery pack is mounted on the vehicle, uneven road surfaces or sudden changes in vehicle speed can transfer energy to the battery pack, which can easily affect the installation stability and safety of the battery pack.

[0003] In related technologies, conventional battery pack designs separate the crossbeams and mounting points. The force transmission path is usually: frame, mounting point, battery pack frame edge, module crossbeam, cell module. This force transmission path is too long, which can easily cause structural failure and reduced stiffness when the battery pack is subjected to vibration-related conditions. For example, the weld seams or body of the battery pack may crack, and the overall mode of the pack may be too low, making the vehicle more prone to resonance. In addition, since the mounting points of conventional battery pack designs are located around the perimeter of the battery pack, they usually need to extend outside the battery pack in the form of lugs or brackets to connect to the vehicle, which greatly wastes battery installation space and results in low space utilization. Utility Model Content

[0004] Embodiments of this utility model provide a battery pack and a vehicle that can improve the technical problem of excessively long force transmission paths in the battery pack.

[0005] In a first aspect, an embodiment of the present invention provides a battery pack, which includes a housing and a crossbeam; the housing has a communicating accommodating space and a mounting hole; the crossbeam is fixedly connected to the housing and installed in the accommodating space, and part of the crossbeam is provided in the mounting hole for connecting to a vehicle frame to load the battery pack onto the vehicle frame.

[0006] In one embodiment, the housing includes a bottom wall and side walls, which form the receiving space, and the bottom wall has the mounting hole.

[0007] In one embodiment, the crossbeam includes a protrusion and a body. One end of the protrusion is fixedly connected to the body, and the other end extends in a direction away from the body and is inserted into the mounting hole. The protrusion is used to connect to the vehicle frame. The mounting hole has a hole wall surrounding the protrusion, and the hole wall is fixedly connected to the periphery of the protrusion.

[0008] In one embodiment, the hole wall and the protrusion are connected by friction stir welding.

[0009] In one embodiment, the mounting hole is a circular hole, and the cross-section of the protrusion is circular.

[0010] In one embodiment, the sidewall includes a first sub-wall and a second sub-wall arranged along the width direction of the box body, and the opposite ends of the main body are respectively connected to the first sub-wall and the second sub-wall.

[0011] In one embodiment, there are multiple protrusions, which are spaced apart along the width direction of the housing, and there are multiple mounting holes, with each protrusion engaging with one of the mounting holes.

[0012] Secondly, embodiments of this utility model provide a vehicle including a frame and the aforementioned battery pack, wherein the crossbeam is connected to the frame to mount the battery pack on the frame.

[0013] In one embodiment, the portion of the crossbeam located in the mounting hole is screwed to the vehicle frame.

[0014] In one embodiment, the portion of the crossbeam located at the mounting hole has a threaded hole, the frame has a through hole, and the vehicle further includes a fastener that passes through the through hole and the threaded hole to fasten the crossbeam to the frame.

[0015] In one embodiment, the crossbeam includes a solid portion and a cavity portion connected together, the solid portion being disposed near the mounting hole, the cavity portion having a cavity, and the threaded hole being disposed in the solid portion.

[0016] The beneficial effects of the embodiments of this utility model are as follows:

[0017] In an embodiment of this utility model, the battery pack includes a housing and a crossbeam. The housing has a communicating receiving space and mounting holes. The crossbeam is fixedly connected to the housing and installed in the receiving space. A portion of the crossbeam is located in the mounting holes for connection to a vehicle frame, thereby mounting the battery pack onto the frame. By connecting the crossbeam to the frame, the battery pack is mounted on the frame, meaning the mounting point is integrated into the crossbeam. This reduces the force transmission path, enhances the strength of the housing, and thus improves the fatigue resistance of the battery pack. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 These are multiple perspective views of the battery pack provided in the embodiments of this utility model;

[0020] Figure 2This is an exploded view of a portion of the battery pack structure provided in an embodiment of this utility model;

[0021] Figure 3 yes Figure 2 A first-person perspective structural diagram;

[0022] Figure 4 This is a view of the bottom of the battery pack provided in an embodiment of the present invention;

[0023] Figure 5 yes Figure 4 A cross-sectional view along the AA direction;

[0024] Figure 6 yes Figure 5 A magnified view of a section at point B in the middle;

[0025] Figure 7 yes Figure 5 A magnified view of a section at point C;

[0026] Figure 8 yes Figure 2 A structural diagram from a second perspective. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0028] The battery pack is one of the core components of a new energy vehicle. When the battery pack is mounted on the vehicle, uneven road surfaces or sudden changes in vehicle speed can transfer energy to the battery pack, potentially affecting its installation stability and safety. The main function of the mounting point is to securely fix the battery pack to the vehicle body, ensuring its stability under various driving conditions.

[0029] The crossbeam is a crucial structural component connecting the battery pack to the vehicle body. It significantly improves the overall rigidity of both the battery pack and the vehicle body, reducing vibration and deformation during driving. In the event of a collision, the crossbeam effectively disperses impact forces, protecting the battery pack from damage. Furthermore, the crossbeam serves as a fulcrum for mounting electrical connectors and thermal management systems, ensuring the stability and reliability of these systems.

[0030] In related technologies, conventional battery pack designs separate the crossbeams and mounting points. The force transmission path is usually: frame, mounting point, battery pack frame edge, module crossbeam, cell module. This force transmission path is too long, which can easily cause structural failure and reduced stiffness when the battery pack is subjected to vibration-related conditions. For example, the weld seams or body of the battery pack may crack, and the overall mode of the pack may be too low, making the vehicle more prone to resonance. Furthermore, since the mounting points of conventional battery pack designs are located on the side or around the battery pack, they usually need to extend outside the battery pack in the form of lugs or brackets to connect with the vehicle, which greatly wastes battery installation space and results in low space utilization.

[0031] To address the aforementioned problems, firstly, embodiments of this application provide a battery pack, please refer to... Figure 1 and Figure 2 The battery pack may include a housing 100 and a crossbeam 200, with the crossbeam 200 mounted on the housing 100. The crossbeam 200 and the housing 100 may be fixedly connected, such as by welding or screwing.

[0032] The housing 100 has a communicating receiving space 120 and a mounting hole 111. In some examples, the housing 100 includes a bottom wall 110 and a side wall 130, which form the receiving space 120. The mounting hole 111 is provided on the bottom wall 110. In other examples, the mounting hole may also be provided on the side wall.

[0033] Please combine Figure 3 , Figure 4 The crossbeam 200 is fixedly connected to the box body 100 and installed in the receiving space 120. The connection between the crossbeam 200 and the box body 100 can be by bolting, welding, etc.

[0034] A portion of the crossbeam 200 is disposed in the mounting hole 111 for connection to the vehicle frame to mount the battery pack onto the frame. For example, the mounting hole 111 allows a portion of the crossbeam 200 to be positioned opposite the vehicle frame, and a portion of the crossbeam 200 can be connected to the vehicle frame through the mounting hole 111. The crossbeam 200 passes through the mounting hole 111, enabling its connection to the vehicle frame. The crossbeam 200 and the vehicle frame can be connected by means of screwing, riveting, welding, etc. In some examples, the crossbeam 200 is screwed to the vehicle frame.

[0035] Thus, the battery pack is mounted on the frame by connecting the crossbeam 200 to the frame. In other words, the battery pack can be connected to the frame at least via the crossbeam 200.

[0036] In this embodiment, the battery pack is mounted on the vehicle frame by connecting the crossbeam 200 to the frame; that is, the mounting point is integrated into the crossbeam. This reduces the force transmission path, enhances the strength of the housing, and thus improves the fatigue resistance of the battery pack.

[0037] The battery pack is typically installed under the chassis in a vehicle. This is because a chassis-level installation minimizes the impact on passenger space and helps maintain a low center of gravity, improving driving stability. This not only allows the battery pack to occupy almost the entire chassis space, but also, through the protection of reinforcing ribs and a load-bearing frame, effectively reduces the risk of short-circuit spontaneous combustion in the event of a collision.

[0038] In some embodiments, the battery pack is located under the chassis, allowing the crossbeam 200 to be connected to the chassis of the vehicle frame.

[0039] In some embodiments, the battery pack may further include battery cells, which may be installed in the receiving space 120 between the crossbeam 200 and the housing.

[0040] As the skeleton structure of the battery pack, one of the main functions of the crossbeam is to provide physical support and ensure that the entire battery pack can withstand forces from different directions, such as vibration and impact, during vehicle operation. Especially in the event of a collision, the crossbeam can effectively absorb and disperse energy, protecting the internal cells from direct damage.

[0041] In some embodiments, the housing 100 includes a bottom wall 110 and a side wall 130, the bottom wall 110 and the side wall 130 forming the receiving space 120, and the bottom wall 110 having the mounting hole 111.

[0042] In these embodiments, the mounting hole 111 is provided in the bottom wall 110, and the crossbeam 200 is connected to the vehicle frame through the mounting hole 111 at the bottom. Compared with the related art, which provides a hanging ear or bracket on the side of the battery pack housing and locks the battery pack to the vehicle frame through the hanging ear or bracket on the side of the battery pack housing, the battery pack in this embodiment is connected to the vehicle frame through the mounting hole 111 at the bottom. That is to say, the battery pack is in a bottom-locked state. This can save the width dimension of the battery. Within the same size range, this solution can accommodate more cells to obtain more power and extend the vehicle's driving range.

[0043] The side of the crossbeam 200 can be welded to the side wall 130, thereby further enhancing the connection between the crossbeam 200 and the battery pack housing 100.

[0044] In some embodiments, the crossbeam 200 includes a protrusion 210 and a body 230. One end of the protrusion 210 is fixedly connected to the body 230, and the other end extends in a direction away from the body and is inserted into the mounting hole 111. The protrusion 210 is used to connect to the vehicle frame. The mounting hole 111 has a hole wall surrounding the periphery of the protrusion 210, and the hole wall is fixedly connected to the periphery of the protrusion 210. The protrusion 210 and the body 230 can be fixedly connected by means of screwing, welding, or integral molding.

[0045] In these embodiments, the crossbeam 200 is connected to the frame via a protrusion 210. During processing, the protrusion 210 can be first inserted into the mounting hole 111, and then the periphery of the protrusion 210 can be fixedly connected to the wall of the mounting hole 111. Since the wall of the mounting hole 111 is circumferentially arranged around the protrusion 210, the periphery of the protrusion 210 can be connected to the wall of the mounting hole 111, thereby enabling a tight connection between the protrusion 210 and the bottom wall 110, resulting in better force transmission.

[0046] In some embodiments, the hole wall and the protrusion 210 are connected by friction stir welding. In these embodiments, friction stir welding provides a uniform and tight weld between the hole wall and the protrusion 210, resulting in good weld quality and ensuring the airtightness and strength of the housing.

[0047] Friction stir welding (FSW) is a solid-state joining process that uses mechanical force and frictional heat to achieve a strong bond between two or more materials without melting the workpiece material. Because the temperature during FSW is relatively low, it avoids problems such as porosity and cracks that can occur in traditional fusion welding, resulting in higher weld quality. Compared to other welding methods, FSW reduces material waste and energy consumption, while also simplifying equipment structure to lower costs.

[0048] In friction stir welding, a rotating stirring head is inserted into the joint of the workpieces to be welded. This stirring head consists of two main parts: a shoulder at the top and a stirring pin extending into the joint. As the stirring head advances along a predetermined path, its rotational motion generates intense friction with the surface and internal materials of the workpiece, producing enough heat to bring the materials to a plastic state without completely melting them. At this point, the plasticized material flows from front to back under the pressure of the stirring head and is forced to re-solidify due to the pressure applied by the shoulder, forming a dense and defect-free weld.

[0049] Unlike traditional fusion welding methods, friction stir welding does not require the addition of welding wire or shielding gas, and it does not produce pollution, fumes, or radiation throughout the process, making it more environmentally friendly.

[0050] In some embodiments, the mounting hole 111 is a circular hole, and the cross-section of the protrusion 210 is circular. For example, it can be a cylinder or a cone. In some examples, the protrusion 210 can be cylindrical. In these embodiments, the mounting hole 111 is a circular hole, and the cross-section of the protrusion 210 is circular. The protrusion 210 and the mounting hole 111 are adapted to each other in shape, and during friction stir welding, the welding becomes more uniform. In some examples, the protrusion 210 and the mounting hole 111 can be coaxially arranged.

[0051] During processing, mounting holes 111 can be pre-drilled in the bottom wall 110 of the housing 100. Using a single-piece machining machine, the main body 230 and the protrusion 210 are machined. Then, the protrusion 210 is inserted into the mounting hole 111. The protrusion 210 and the mounting hole 111 can have a hole-shaft clearance fit. When there are multiple protrusions 210 on a crossbeam, multiple protrusions 210 are assembled with the mounting holes 111 one by one, so that the housing 100 and a single crossbeam are assembled through several hole-shaft fits. Afterwards, from the bottom surface of the housing 100, circular friction stir welding can be performed along the circular gap created by the hole-shaft fit, thereby achieving a rigid connection between the crossbeam and the housing 100. Because friction stir welding has good welding quality, the airtightness and strength of the housing are guaranteed.

[0052] In some embodiments, the sidewall 130 includes a first sub-wall 131 and a second sub-wall 133 arranged along the width direction of the housing, and the opposite ends of the main body 230 are respectively connected to the first sub-wall 131 and the second sub-wall 133.

[0053] In some examples, the mounting hole 111 can be provided in the bottom wall 110, and the protrusion 210 of the crossbeam 200 is fixedly connected to the bottom wall 110. The crossbeam 200 is connected to the frame through the mounting hole 111 in the bottom wall 110. Meanwhile, the opposite ends of the main body 230 are respectively connected to the first sub-wall 131 and the second sub-wall 133. That is, the bottom of the crossbeam 200 is fixedly connected to the bottom wall 110, and the bottom of the crossbeam 200 is connected to the frame. The side of the crossbeam 200 is connected to the first sub-wall 131 and the second sub-wall 133. This makes the connection between the crossbeam 200 and the housing 100 more secure and reliable. The side of the crossbeam 200 can be welded to the first sub-wall 131, for example, by arc welding. The side of the crossbeam 200 can also be welded to the second sub-wall 133, for example, by arc welding.

[0054] In some embodiments, there are multiple protrusions 210, which are spaced apart along the width direction of the housing 100. There are also multiple mounting holes 111, and each protrusion 210 mates with one of the mounting holes 111. In this way, the battery pack is securely mounted on the vehicle frame by connecting to the vehicle frame through the multiple protrusions 210.

[0055] In some embodiments, there are multiple crossbeams 200.

[0056] In some examples, there are three crossbeams 200, which are spaced apart along the length of the box.

[0057] In some examples, a crossbeam 200 includes a body 230 and four protrusions 210, which are spaced apart along the width direction of the housing 100. There are four mounting holes 111, and the protrusions 210 mate with each mounting hole 111.

[0058] Secondly, embodiments of this application also provide a vehicle comprising a frame and the aforementioned battery pack, wherein the crossbeam 200 is connected to the frame to mount the battery pack on the frame. This vehicle possesses all the beneficial effects of the aforementioned battery pack, which will not be elaborated upon herein.

[0059] The vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this disclosure does not make any specific restrictions.

[0060] In the vehicle of this application, the battery pack is mounted on the frame by connecting the crossbeam 200 to the frame, that is, the mounting point is integrated into the crossbeam. This reduces the force transmission path, enhances the strength of the housing, and thus improves the fatigue resistance of the battery pack.

[0061] The battery pack can be installed under the chassis because this location minimizes the impact on passenger space and helps maintain a low center of gravity, improving driving stability. This not only allows the battery pack to occupy almost the entire chassis space, but also effectively reduces the risk of short-circuit combustion in the event of a collision through the protection of reinforcing ribs and a load-bearing frame.

[0062] The battery cell can be installed in the housing space 120 between the crossbeam 200 and the housing.

[0063] In the vehicle of this application, the mounting hole 111 is provided on the bottom wall 110 of the battery pack, and the crossbeam 200 is connected to the vehicle frame through the mounting hole 111 at the bottom. Compared with the related technology, which provides a hanging ear or bracket on the side of the battery pack housing and locks the battery pack to the vehicle frame through the hanging ear or bracket on the side of the battery pack housing, the battery pack in this embodiment is connected to the vehicle frame through the mounting hole 111 at the bottom. That is to say, the battery pack is in a bottom-locked state. This can save the width dimension of the battery. Within the same size range, this solution can accommodate more cells to obtain more power and extend the vehicle's driving range.

[0064] In some embodiments, the crossbeam 200 includes a protrusion 210 and a body 230. One end of the protrusion 210 is fixedly connected to the body 230, and the other end extends in a direction away from the body and is inserted into the mounting hole 111. The protrusion 210 is used to connect to the vehicle frame. The mounting hole 111 has a hole wall surrounding the periphery of the protrusion 210, and the hole wall is fixedly connected to the periphery of the protrusion 210. The protrusion 210 and the body 230 can be fixedly connected by means of screwing, welding, or integral molding.

[0065] In these embodiments, the crossbeam 200 is connected to the frame via a protrusion 210. During processing, the protrusion 210 can be first inserted into the mounting hole 111, and then the periphery of the protrusion 210 can be fixedly connected to the wall of the mounting hole 111. Since the wall of the mounting hole 111 is circumferentially arranged around the protrusion 210, the periphery of the protrusion 210 can be connected to the wall of the mounting hole 111, thereby enabling a tight connection between the protrusion 210 and the bottom wall 110, resulting in better force transmission.

[0066] In some embodiments, the hole wall and the protrusion 210 are connected by friction stir welding. In these embodiments, friction stir welding provides a uniform and tight weld between the hole wall and the protrusion 210, resulting in good weld quality and ensuring the airtightness and strength of the housing.

[0067] In some embodiments, the portion of the crossbeam 200 located in the mounting hole 111 is screwed to the vehicle frame.

[0068] In some embodiments, the portion of the crossbeam 200 located at the mounting hole 111 has a threaded hole 201, the frame has a through hole, and the vehicle further includes fasteners that pass through the through hole and the threaded hole to secure the crossbeam 200 to the frame. The fasteners may be screws.

[0069] Please combine Figure 8In some examples, the crossbeam 200 includes a protrusion 210 and a body 230. One end of the protrusion 210 is fixedly connected to the body 230, and the other end extends away from the body and is inserted into the mounting hole 111. The protrusion 210 is used to connect to the vehicle frame. The mounting hole 111 has a hole wall surrounding the protrusion 210, and the hole wall is fixedly connected to the periphery of the protrusion 210. The end of the protrusion 210 away from the body 230 has a threaded hole. The vehicle frame may have an opening so that screws can be sequentially passed through the vehicle frame and the threaded hole of the protrusion 210. The screws engage with the threaded hole of the protrusion 210 to secure the battery pack to the vehicle frame.

[0070] Please combine Figure 5 , Figure 6 as well as Figure 7 In some embodiments, the crossbeam 200 includes a solid portion 240 and a cavity portion 250 connected together. The solid portion 240 is disposed near the mounting hole 111, the cavity portion 250 is provided with a cavity 251, and the threaded hole 201 is disposed in the solid portion 240.

[0071] In some examples, the threaded hole is formed along the height of the solid portion 240, and the height of the solid portion 240 needs to be greater than or equal to the depth of the threaded hole. This makes the connection tighter and the sealing better. By setting the solid portion 240 at the bottom of the crossbeam 200, the rigidity of the crossbeam can be enhanced.

[0072] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body provided with a communicating accommodating space and a mounting hole; and a cross beam fixedly connected with the box body and mounted in the accommodating space, part of the cross beam being arranged in the mounting hole for connecting with a vehicle frame to load the battery pack on the vehicle frame. The cross beam comprises a protruding part and a main body, one end of the protruding part being fixedly connected with the main body, the opposite end extending away from the main body and being inserted into the mounting hole, the protruding part being used for connecting with the vehicle frame, the mounting hole having a hole wall arranged around the protruding part, the hole wall being fixedly connected with the four sides of the protruding part.

2. The battery pack of claim 1, wherein, The box body comprises a bottom wall and a side wall, the bottom wall and the side wall forming the accommodating space, the bottom wall being provided with the mounting hole.

3. The battery pack of claim 1, wherein, The hole wall and the protruding part are connected by friction stir welding.

4. The battery pack of claim 3, wherein, The mounting hole is a circular hole, and the cross section of the protruding part is circular.

5. The battery pack of claim 1, wherein, The box body comprises a side wall, the side wall comprising a first sub-wall and a second sub-wall arranged along the width direction of the box body, the opposite ends of the main body being connected with the first sub-wall and the second sub-wall respectively.

6. The battery pack of claim 5, wherein, The protruding part is a plurality of protruding parts, the plurality of protruding parts being arranged at intervals along the width direction of the box body, the mounting hole being a plurality of mounting holes, the protruding part and the mounting hole being one-to-one matched.

7. A vehicle, characterized in that, comprising a vehicle frame and the battery pack according to any one of claims 1-6, the cross beam being connected with the vehicle frame to load the battery pack on the vehicle frame.

8. The vehicle of claim 7, wherein The part of the cross beam arranged in the mounting hole is screwed with the vehicle frame.

9. The vehicle of claim 7, wherein, The part of the cross beam arranged in the mounting hole is provided with a threaded hole, the vehicle frame being provided with a through hole, the vehicle further comprising a fastener, the fastener being arranged in the through hole and the threaded hole to fasten the cross beam with the vehicle frame.

10. The vehicle of claim 9, wherein, The cross beam comprises a solid part and a cavity part connected with each other, the solid part being arranged close to the mounting hole, the cavity part being provided with a cavity, the threaded hole being arranged in the solid part.

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