Battery pack case, battery pack, and vehicle

Abstract

The application discloses a battery pack box, a battery pack and a vehicle, and belongs to the technical field of batteries, and aims to solve the technical problem that a battery pack box is difficult to effectively avoid the frequency of main vibration sources such as a road surface and a motor, thereby causing a resonance risk, affecting the service life of a battery and the reliability of an electrical connection. The battery pack box provided by the application comprises a shell, an inner framework arranged in the shell and connected with the shell, a reinforcing structure arranged in the shell and connected with the inner framework, and an outer framework arranged outside the shell and connected with the shell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack housing, a battery pack, and a vehicle. Background Technology

[0002] A battery pack is the core energy storage system that powers electric vehicles and other devices. A battery pack typically includes a battery pack housing, as well as electrical, thermal, and battery management systems housed within the battery casing. As a critical structural component, the battery pack housing must not only possess sufficient mechanical strength to resist deformation and damage, but also effectively isolate external foreign objects, dust, and moisture from intrusion, ensuring the electrical safety and long-term reliability of the battery pack.

[0003] However, in related technologies, battery pack housings are usually assembled from multiple independent structural components by welding, riveting, or bolting. When these structural components are subjected to external vibration excitation, the connection points are prone to forming weak points in structural rigidity, making it difficult to effectively avoid the main vibration source frequencies such as road surface and motor, thereby causing resonance risk and affecting battery life and electrical connection reliability. Utility Model Content

[0004] This application provides a battery pack housing, a battery pack, and a vehicle to at least partially solve the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a battery pack housing is provided, the battery pack housing comprising: case; The internal skeleton is located inside the shell and is connected to the shell. The reinforced structure is housed within the shell and connected to the internal frame. The exoskeleton is located outside the shell and is connected to the shell.

[0006] In some embodiments of this application, the inner skeleton includes: Multiple horizontal frames extend along a first direction and are spaced apart along a second direction; Multiple longitudinal frames extend along the second direction and are spaced apart in the first direction, with each longitudinal frame connected to all the transverse frames; The first direction and the second direction are perpendicular.

[0007] In some embodiments of this application, The cross frame is provided with a plurality of first reinforcing parts on at least one side in the second direction, and the plurality of first reinforcing parts are spaced apart along the first direction; And / or, The longitudinal frame has a plurality of second reinforcing parts on at least one side in the first direction, and the plurality of second reinforcing parts are spaced apart along the second direction.

[0008] In some embodiments of this application, the reinforcing structure includes: Multiple crossbeams extend along a first direction and are spaced apart in a second direction; At least one longitudinal beam connects to all the transverse beams; Among them, at least one of the crossbeams and longitudinal beams is fixedly connected to the internal frame, and the first direction and the second direction are perpendicular.

[0009] In some embodiments of this application, the inner skeleton includes: Multiple horizontal frames extend along a first direction and are spaced apart along a second direction; Multiple longitudinal frames extend along a second direction and are spaced apart in a first direction. Each longitudinal frame is connected to all transverse frames. The multiple longitudinal frames include the two outermost end longitudinal frames in the first direction. Two inner side beams are set between the corresponding end longitudinal frames and cross beams, and both extend along the second direction; Among them, the crossbeams are connected to the corresponding cross frames, and / or the longitudinal beams are connected to the corresponding longitudinal frames.

[0010] In some embodiments of this application, notches are provided at both ends of the crossbeam; when the crossbeam is connected to the corresponding cross frame, one of the two inner side beams is located at a notch and is pressed against an end longitudinal frame by the crossbeam, and the other inner side beam is located at another notch and is pressed against another end longitudinal frame by the crossbeam.

[0011] In some embodiments of this application, the inner beam includes a beam body and a first lap plate and a second lap plate disposed on both sides of the beam body in a second direction, the first lap plate and the second lap plate extending in a direction away from each other, and the first lap plate being disposed close to the longitudinal beam relative to the second lap plate; the housing has a first edge and a second edge disposed opposite to each other in a second direction. When the crossbeam is connected to the corresponding cross frame, The first lap plate on one of the two inner side beams overlaps the corresponding end longitudinal frame, and the second lap plate overlaps the first edge. The first lap plate on the other inner side beam of the two inner side beams overlaps the corresponding end longitudinal frame, and the second lap plate overlaps the second edge.

[0012] In some embodiments of this application, the reinforcing structure further includes at least one of a mounting point assembly and a connector, wherein the mounting point assembly is disposed on the crossbeam and is used to connect to the vehicle body; the connector is disposed at the intersection of the crossbeam and the longitudinal beam to connect the crossbeam and the longitudinal beam.

[0013] In some embodiments of this application, the housing has a first edge and a second edge disposed opposite to each other in a second direction; the outer frame includes: Two outer side beams are both located on the outside of the shell and are positioned opposite each other along the second direction. One of the outer side beams is located below the first edge, and the other outer side beam is located below the second edge.

[0014] In some embodiments of this application, the housing has a first side and a second side disposed opposite each other in a first direction, and the outer frame further includes: Multiple first mounting structures are spaced apart on the first side and located outside the housing; Multiple second mounting structures are spaced apart on the second side and located outside the housing.

[0015] According to a second aspect of this application, a battery pack is provided, the battery pack comprising: As described in any of the above technical solutions, the battery pack housing has a reinforcing structure used to divide the internal space of the housing into multiple accommodating sub-cavities; The liquid cooling plate is positioned between the inner frame and the reinforcing structure, and is connected to the inner frame. The battery module is housed in a cavity between two adjacent crossbeams and is in thermal contact with the liquid cooling plate.

[0016] In some embodiments of this application, the battery pack further includes: An elastic filler is provided to fill the gap between the battery module and the receiving cavity.

[0017] According to a third aspect of this application, a vehicle is also provided, the vehicle comprising: The battery pack as described in any of the above technical solutions.

[0018] In the battery pack housing of this application embodiment, through the above-described technical solution, the inner frame serves as the main internal support structure, the outer frame forms an external covering constraint on the shell, and combined with the local reinforcement effect of the internal reinforcing components, the three together with the shell constitute a spatial frame system that works in concert to bear force. This structure enhances the overall stiffness of the battery pack housing, thereby effectively increasing its natural frequency and enabling it to avoid excitation frequency ranges from common vibration sources such as road surfaces and motors, reducing the risk of resonance, and thus ensuring the long-term service life of the battery and the reliability of electrical connections. Furthermore, the inner and outer frames together construct a multi-path force transmission mechanism, which can efficiently disperse and absorb impact energy when the battery pack is subjected to collision or compression, providing multi-level protection for the internal cells to optimize the modal performance and compression resistance of the battery pack, thereby improving the structural safety and long-term durability of the battery pack housing under complex working conditions.

[0019] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0021] Figure 1 This is an exploded view of the battery pack housing in an embodiment of this application; Figure 2 This is a bottom view of the battery pack housing in an embodiment of this application; Figure 3 This is a perspective view of the internal skeleton of the battery pack housing in the embodiments of this application; Figure 4 yes Figure 3 Enlarged view of part A in the image; Figure 5 This is a perspective view of the reinforcing structure in the battery pack housing in the embodiments of this application; Figure 6 This is a perspective view of the battery pack housing in an embodiment of this application; Figure 7 This is a partial enlarged view of the inner side beam of the inner frame in the battery pack housing in this embodiment of the application; Figure 8 yes Figure 6 Enlarged view of part B in the image; Figure 9 This is a schematic diagram of the outer frame structure in the battery pack housing in the embodiments of this application; Figure 10 This is a perspective view of the battery pack in the embodiments of this application; Figure 11 This is a material property curve of the elastic filler in the battery pack in the embodiments of this application.

[0022] Explanation of reference numerals in the attached figures: 1-Shell; 11-Internal space; 12-First edge; 13-Second edge; 14-First side; 15-Second side; 2-Inner frame; 21-Transverse frame; 211-First reinforcing part; 22-Longitudinal frame; 221-Second reinforcing part; 222-End longitudinal frame; 23-Inner side beam; 231-Beam body; 2311-Crimping plate; 2312-First side plate; 2313-Second side plate; 232-First lap plate; 233-Second lap plate; 3-Reinforcing structure; 31-Crossbeam; 311-Notch; 32-Longitudinal beam; 33-Hanging point assembly; 34-Connector; 4-External frame; 41-External beam; 42-First mounting structure; 43-Second mounting structure; 10-Battery cavity; 101-Sub-cavity; 20-Battery module; 30-Liquid cooling plate; 40-Elastic filler; X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] This application provides a battery pack housing, a battery pack, and a vehicle, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0028] A battery pack is the core energy storage system that powers electric vehicles and other devices. A battery pack typically includes a battery pack housing, as well as electrical, thermal, and battery management systems housed within the battery casing. As a critical structural component, the battery pack housing must not only possess sufficient mechanical strength to resist deformation and damage, but also effectively isolate external foreign objects, dust, and moisture from intrusion, ensuring the electrical safety and long-term reliability of the battery pack.

[0029] However, in related technologies, battery pack housings are usually assembled from multiple independent structural components by welding, riveting, or bolting. When these structural components are subjected to external vibration excitation, the connection points are prone to forming weak points in structural rigidity, making it difficult to effectively avoid the main vibration source frequencies such as road surface and motor, thereby causing resonance risk and affecting battery life and electrical connection reliability.

[0030] As the structural carrier of the battery pack, the battery pack housing plays a crucial protective role. It must not only ensure the integrity of internal components under conditions such as mechanical collision, impact, and vibration, but also have good sealing performance to effectively prevent the intrusion of external foreign objects such as moisture and dust, thus ensuring the safe operation of the battery pack in complex environments.

[0031] The electrical system is the core of the battery pack's energy flow, mainly including components such as battery cells, high and low voltage wiring harnesses, fuses, and relays. This system is responsible for storing, distributing, and transmitting electrical energy, providing a stable and reliable energy source for the entire vehicle.

[0032] The thermal management system is essentially the temperature control center of the battery pack. Since the battery cells generate heat during charging and discharging, and excessively high or low operating temperatures can significantly affect their electrochemical performance, cycle life, and safety, this system uses heat exchange methods such as air cooling, liquid cooling, or direct cooling to ensure that the battery always operates within its optimal temperature range.

[0033] As the intelligent control core of the battery pack, the battery management system (BMS) has the ability to monitor key parameters such as voltage, temperature, and current of individual battery cells in real time. Based on the collected data, the system can implement precise charge and discharge control, equalization management, and thermal management strategies to effectively prevent abnormal states such as overcharging and over-discharging, and estimate remaining power and driving range. When a fault or safety risk is detected, the system can promptly trigger alarms and take protective measures such as power-off.

[0034] Please refer to Figure 1 and Figure 2 The battery pack housing includes a shell 1, an inner frame 2, a reinforcing structure 3, and an outer frame 4. The shell 1 has an internal space 11. The inner frame 2 is disposed within the internal space 11 and connected to the shell 1. The reinforcing structure 3 is disposed within the internal space 11 and connected to the inner frame 2. The outer frame 4 is disposed outside the shell 1 and connected to the shell 1.

[0035] In this technical solution, the inner frame 2 serves as the main internal support structure, while the outer frame 4 forms an external enclosure and constraint on the shell 1. Combined with the local reinforcement of the internal reinforcing components, these three elements, together with the shell 1, constitute a spatial frame system that works in synergy to bear force. This structure enhances the overall stiffness of the battery pack housing, thereby effectively increasing its natural frequency and enabling it to avoid excitation frequency ranges from common vibration sources such as road surfaces and motors, reducing the risk of resonance and thus ensuring the long-term service life of the battery and the reliability of electrical connections. Furthermore, the inner frame 2 and the outer frame 4 jointly construct a multi-path force transmission mechanism, which can efficiently disperse and absorb impact energy when the battery pack is subjected to collisions or compression, providing multi-level protection for the internal cells to optimize the modal performance and compression resistance of the battery pack. This, in turn, helps to improve the structural safety and long-term durability of the battery pack housing under complex working conditions.

[0036] In order to more clearly define the battery pack housing provided in this application, it is assumed that the housing 1 has a first direction X, a second direction Y and a third direction Z that intersect and are perpendicular to each other.

[0037] Please refer to Figure 1 and Figure 3 The inner frame 2 forms the internal support structure of the shell 1. The inner frame 2 includes multiple transverse frames 21 and multiple longitudinal frames 22. The transverse frames 21 extend along a first direction X and are spaced apart along a second direction Y. The longitudinal frames 22 extend along the second direction Y and are spaced apart along the first direction X. Each longitudinal frame 22 is connected to all the transverse frames 21. Specifically, the multiple transverse frames 21 extending along the first direction X and the multiple longitudinal frames 22 extending along the second direction Y intersect each other, forming a stable grid-like or lattice-like beam structure. This structure diffuses impact, vibration, and other loads from the bottom, sides, or interior of the shell 1 to the entire plane of the shell 1 through the interlaced transverse and longitudinal frames 21 and 22, avoiding stress concentration and improving the rigidity and resistance to local deformation of the shell 1. For example, the multiple transverse frames 21 and multiple longitudinal frames 22 have similar structures and are integrally formed using sheet metal stamping processes.

[0038] Please combine Figure 3 and Figure 4As an example, at least one side of the transverse framework 21 in the second direction Y is provided with a plurality of first reinforcing portions 211, and the plurality of first reinforcing portions 211 are arranged at intervals along the first direction X. As another example, at least one side of the longitudinal framework 22 in the first direction X is provided with a plurality of second reinforcing portions 221, and the plurality of second reinforcing portions 221 are arranged at intervals along the second direction Y. As a further example, at least one side of the transverse framework 21 in the second direction Y is provided with a plurality of first reinforcing portions 211, and the plurality of first reinforcing portions 211 are arranged at intervals along the first direction X. At least one side of the longitudinal framework 22 in the first direction X is provided with a plurality of second reinforcing portions 221, and the plurality of second reinforcing portions 221 are arranged at intervals along the second direction Y.

[0039] By adopting the above manner, reinforcing portions (the first reinforcing portion 211 and the second reinforcing portion 221) are provided on at least one of the transverse framework 21 and the longitudinal framework 22, so as to improve the stability and rigidity of the inner framework 2 through local reinforcement. The reinforcing portions provide dense support points for the inner framework 2, which can effectively increase its critical buckling stress and prevent local instability under compression or shear. At the same time, the reinforcing portions divide the large-area plate surface into a plurality of small-sized plate grids, so that the plate member that is prone to overall bending is transformed into a truss-like structure with higher bending rigidity.

[0040] Exemplarily, the cross-sectional shape of at least one of the first reinforcing portion 211 and the second reinforcing portion 221 is a "几"-shaped structure, so as to form a continuous groove-shaped structure. When a plurality of "几"-shaped reinforcing portions are arranged at a certain interval, a plurality of efficient force transmission paths can be formed on the framework to disperse local loads to the entire framework system. For example, in other embodiments, at least one of the first reinforcing portion 211 and the second reinforcing portion 221 is a rib structure provided on the corresponding framework (the transverse framework 21 and the longitudinal framework 22).

[0041] With reference to Figure 1 and Figure 5 , the reinforcing structure 3 includes a plurality of cross beams 31 and at least one longitudinal beam 32. The plurality of cross beams 31 all extend along the first direction X and are arranged at intervals in the second direction Y. The at least one longitudinal beam 32 is connected to all the cross beams 31. At least one of the cross beam 31 and the longitudinal beam 32 is fixedly connected to the inner framework 2, which together form a high-rigidity space grid, so as to further efficiently disperse loads such as impact and vibration from the bottom or side of the housing 1 to the entire housing 1 through a plurality of nodes and paths, further improving the integrity of the battery pack box.

[0042] Specifically, the portion of the longitudinal beam 32 located between two adjacent transverse beams 31, together with the two adjacent transverse beams 31, forms a receiving sub-cavity 101. Furthermore, the transverse beams 31 and the longitudinal beams 32 divide the internal space 11 into multiple independent receiving sub-cavities 101, providing precise positioning and a stable mounting foundation for the battery module 20 or cell stack, effectively preventing displacement or loosening under vibration conditions. For example, in the event of thermal runaway of a single cell or localized mechanical compression, these beams act as a physical barrier, effectively delaying or preventing the spread of the fault to adjacent areas, thus improving the safety performance of the battery pack.

[0043] Reference Figure 1 and Figure 6 The inner frame 2 includes multiple transverse frames 21, multiple longitudinal frames 22, and two inner side beams 23. The multiple transverse frames 21 extend along a first direction X and are spaced apart in a second direction Y. The multiple longitudinal frames 22 extend along the second direction Y and are spaced apart in the first direction X. Each longitudinal frame 22 is connected to all the transverse frames 21, and the multiple longitudinal frames 22 include two outermost end longitudinal frames 222 in the first direction X. The two inner side beams 23 are disposed between the corresponding end longitudinal frames 222 and the transverse beams 31, and both extend along the second direction Y. Specifically, the transverse beams 31 are connected to the corresponding transverse frames 21, or the longitudinal beams 32 are connected to the corresponding longitudinal frames 22, or the transverse beams 31 are connected to the corresponding transverse frames 21 and the longitudinal beams 32 are connected to the corresponding longitudinal frames 22.

[0044] When the crossbeam 31 is firmly connected to the lower cross frame 21, the two can be mechanically considered as a single composite beam, which greatly enhances the local stiffness in that direction, thereby increasing the overall natural frequency of the battery pack housing and better avoiding resonance. The connection between the crossbeam 31 and the cross frame 21 strengthens the stiffness and bending resistance of the battery pack in the second direction Y, while the connection between the longitudinal beam 32 and the longitudinal frame 22 strengthens the stiffness and bending resistance of the battery pack in the first direction X. With the crossbeam 31 connected to its corresponding cross frame 21 and the longitudinal beam 32 connected to its corresponding longitudinal frame 22, a highly rigid grid or mesh-like composite structure is formed in both directions, effectively resisting bending and torsional deformation from different directions, providing the battery pack with the highest level of overall stiffness and stability. Simultaneously, the inner edge beam 23 is arranged along the inner edge of the shell 1, connecting the crossbeam 31 and the longitudinal frame 22, forming a high-stiffness closed annular frame, enhancing the edge stiffness of the battery pack housing and enabling it to effectively resist torsional deformation.

[0045] It should be noted that, as Figure 3 , Figure 5 and Figure 6As shown, the two inner side beams 23 and the two end beams 31 are connected to form the outer frame of the closed battery cavity 10. The remaining beams 31 and longitudinal beams 32 are arranged in a crisscross pattern to divide the battery cavity 10 into multiple receiving sub-cavities 101, each of which houses a battery module 20. This outer frame reinforces the core area of ​​the battery pack, effectively resisting bending and torsional deformation transmitted from the vehicle body, improving the overall stiffness and modal frequency of the battery pack, and suppressing resonance.

[0046] As an example, the crossbeam 31 is connected to the corresponding cross frame 21 by bolts, and the longitudinal beam 32 is also connected to the corresponding longitudinal frame 22 by bolts. Of course, in other embodiments, the crossbeam 31 is welded to the corresponding cross frame 21, and the longitudinal beam 32 is welded to the corresponding longitudinal frame 22.

[0047] Combination and Figure 5 and Figure 6 Both ends of the crossbeam 31 are provided with notches 311. When the crossbeam 31 is connected to the corresponding cross frame 21, one of the two inner side beams 23 is located at one notch 311 and is pressed against one end longitudinal frame 222 by the crossbeam 31. The other inner side beam 23 is located at the other notch 311 and is pressed against the other end longitudinal frame 222 by the crossbeam 31. Specifically, the notch 311 provides a positioning and mounting groove for the inner side beam 23, ensuring assembly accuracy. At the same time, this design can firmly lock the originally independent side frames (inner side beams 23 and longitudinal frames 22) together with the internal reinforcing structure 3 (crossbeam 31), so that the side frames of the entire battery pack box form a high-rigidity closed force-bearing ring. When the battery pack is subjected to lateral impact or compression, the impact force can be quickly dispersed through this reinforced side frame, which helps to further improve the overall torsional stiffness and lateral deformation resistance of the battery pack box.

[0048] like Figure 6 , Figure 7 and Figure 8As shown, the inner side beam 23 includes a beam body 231, and a first overlapping plate 232 and a second overlapping plate 233 disposed on both sides of the beam body 231 in the second direction Y. The first overlapping plate 232 and the second overlapping plate 233 extend in a direction away from each other, and the first overlapping plate 232 is disposed closer to the longitudinal beam 32 relative to the second overlapping plate 233. The housing 1 has a first edge 12 and a second edge 13 disposed opposite each other in the second direction Y. When the first crossbeam 31 is connected to the corresponding cross frame 21, the first overlapping plate 232 on one of the two inner side beams 23 overlaps with the corresponding end longitudinal frame 222, and the second overlapping plate 233 overlaps with the first edge 12. The first overlapping plate 232 on the other of the two inner side beams 23 overlaps with the corresponding end longitudinal frame 222, and the second overlapping plate 233 overlaps with the second edge 13.

[0049] By employing the above method, multiple load paths can be constructed to achieve efficient stress diffusion. For example, the overlap between the first lap plate 232 and the end longitudinal frame 222 can transfer the force to the inner frame 2, while the overlap between the second lap plate 233 and the first edge 12 (or the second edge 13) can directly transfer the force to the shell 1. Thus, when a lateral impact force acts on the inner side beam 23, the force is immediately decomposed and quickly dispersed through these two paths, avoiding stress concentration at a single connection point and reducing the risk of structural failure.

[0050] Specifically, the beam body 231 includes a pressing plate 2311, and a first side plate 2312 and a second side plate 2313 connected to the pressing plate 2311 on both sides in the second direction Y. The pressing plate 2311, the first lap plate 232, and the second lap plate 233 are staggered in the third direction Z, meaning they are not on the same horizontal plane. The first side plate 2312 connects the pressing plate 2311 and the first lap plate 232, and the second side plate 2313 connects the pressing plate 2311 and the second lap plate 233. The first side plate 2312 and the second side plate 2313 have different dimensions in the third direction Z. In other words, the beam body 231 has an approximately n-shaped cross section perpendicular to the first direction X, so that the load acting on the pressure plate 2311 (such as the pressure from the upper crossbeam 31) can be smoothly transmitted through the first side plate 2312 and the second side plate 2313 at different heights on both sides to the cross frame 21 and the edge of the shell 1 respectively, reducing the risk of stress concentration and making the force distribution more uniform during the transmission process.

[0051] Please continue to refer to Figure 5A mounting point assembly 33 is provided on the crossbeam 31 to achieve a rigid connection between the battery pack and the vehicle body structure. This eliminates the need for on-site marking or drilling during final assembly, allowing operators to directly and precisely position and fix the battery pack to the vehicle body via the mounting points, significantly improving assembly efficiency, precision, and consistency. Furthermore, by enhancing the connection stiffness between the battery pack and the vehicle body, the mounting point assembly 33 effectively increases the overall modal frequency of the battery pack, enabling it to better avoid the main excitation frequency range during vehicle operation. This significantly reduces the risk of structural fatigue due to resonance under long-term vibration conditions, ensuring the connection reliability and structural safety of the battery pack throughout its entire lifespan.

[0052] As an example, the attachment point assembly 33 includes a steel plate pre-welded or riveted to the crossbeam 31, with wire thread inserts or flange nuts pre-pressed onto the plate to provide a strong internal thread for the bolts, preventing the bolts from being directly screwed into the relatively soft aluminum / steel sheet of the crossbeam 31 and causing stripping. Alternatively, the attachment point assembly 33 includes a stud and a lug, with one end of the stud welded to the crossbeam 31 and the other end extending for tightening the nut. The lug is fixed to the crossbeam 31 by welding or bolting and has through holes or threaded holes.

[0053] In other embodiments, the reinforcing structure 3 further includes a connector 34, which is used to rigidly fix the crossbeam 31 and the longitudinal beam 32 at their intersection, thereby improving the local stiffness of the intersection area and the overall structural strength. For example, the connector 34 may be a connecting plate or a connecting piece, which is one or more steel plates of a specific shape, covering the intersection area of ​​the crossbeam 31 and the longitudinal beam 32, and fixing them together as a whole by peripheral welding or bolting to achieve effective force transmission. Alternatively, the connector 34 may be an L-shaped or cross-shaped metal casting or stamping, which connects the ends or sides of the mutually perpendicular crossbeam 31 and longitudinal beam 32 together by bolting or welding to form a stable corner node.

[0054] Please combine Figure 2 , Figure 6 and Figure 9The housing 1 has a first edge 12 and a second edge 13 arranged opposite each other in the second direction Y. The outer frame 4 includes two outer beams 41, both of which are located on the outside of the housing 1 and are arranged opposite each other in the second direction Y. One of the two outer beams 41 is located below the first edge 12, and the other outer beam 41 is located below the second edge 13. The two outer beams 41 arranged opposite each other in the second direction Y are firmly integrated with the bottom and sides of the housing 1, forming the reinforcing guard plates on both sides of the bottom of the battery pack to bear the main loads from the vehicle and the road surface, and improve the overall stiffness and modal frequency of the battery pack. Specifically, the outer beams 41 are the first line of defense against lateral and bottom collisions of the battery pack. When a side scrape, collision, or bottom scrape occurs, the outer beams 41 can absorb and disperse most of the impact energy first, effectively preventing the impact force from acting directly on the main body of the housing 1 that houses the battery, and providing protection for the core area of ​​the battery.

[0055] As an example, at least a portion of the two outer beams 41 extend to the bottom of the shell 1 and are connected to the bottom wall of the shell 1. The inner frame 2 and the shell 1 are welded together to form an integral structure, and the outer frame 4 is welded together to the shell 1 to form an integral structure. The welding method used is mainly spot welding.

[0056] Specifically, two inner side beams 23 and two outer side beams 41 are provided in a one-to-one correspondence, and one inner side beam 23 and one outer side beam 41 are respectively provided on opposite sides of the first edge 12, and the other inner side beam 23 and the other outer side beam 41 are respectively provided on opposite sides of the second edge 13.

[0057] The housing 1 has a first side 14 and a second side 15 opposite each other in a first direction X. The outer frame 4 also includes multiple first hook-up structures 42 and multiple second hook-up structures 43. The multiple first hook-up structures 42 are spaced apart on the first side 14. The multiple second hook-up structures 43 are spaced apart on the second side 15. Both the multiple first hook-up structures 42 and the multiple second hook-up structures 43 are located outside the housing 1. When the vehicle travels on uneven roads, the frame will undergo torsional deformation. The hook-up structures (such as mounting points) symmetrically distributed on both sides of the battery pack can form a strong anti-torsional coupling with the vehicle body. At the same time, the exposed hook-up structures facilitate automated assembly. The robotic arm can easily grasp the battery pack and guide and position it through these hook-up structures, quickly connecting it with the corresponding interface on the vehicle body to improve the assembly efficiency, accuracy, and automation level of the production line.

[0058] In addition, please continue to refer to Figure 8At least a portion of the outer beam 41 extends out of the housing 1, and a through hole is provided on the portion extending out of the housing 1, through which it is connected to the vehicle body. This provides an easy-to-operate assembly reference for the docking of the battery pack with the vehicle body. For example, during final assembly, workers or robots can quickly pass bolts through the through hole and tighten them with threaded holes on the vehicle body. During maintenance, it also facilitates disassembly and installation, improving production efficiency and maintenance convenience.

[0059] In some embodiments of this application, a battery pack is also provided, such as... Figure 10 As shown, the battery pack includes a battery pack housing, a liquid cooling plate 30, and a battery module 20 as described in any of the above technical solutions. The liquid cooling plate 30 is disposed between the inner frame 2 and the reinforcing structure 3, and is connected to the inner frame 2. The battery module 20 is disposed in a receiving cavity 101 between two adjacent crossbeams 31, and is in thermal contact with the liquid cooling plate 30. Since the battery pack housing in this battery pack has the same structure as the battery pack housing in the aforementioned embodiments, both can solve the same technical problems and achieve the same technical effects.

[0060] In other words, the liquid cooling plate 30 is positioned between the inner frame 2 and the reinforcing structure 3 (crossbeam 31 / longitudinal beam 32), allowing it to achieve large-area thermal contact with the battery module 20. This enables the heat generated by the battery cell to be directly transferred to the liquid cooling plate 30 through the shortest path and quickly carried away by the coolant, achieving efficient heat dissipation. Both the reinforcing structure 3 and the battery module 20 are supported on the upper surface of the liquid cooling plate 30. The liquid cooling plate 30 (usually an aluminum plate with a certain rigidity) is firmly connected to the upper inner frame 2 and the lower reinforcing structure 3, forming a composite sandwich shell structure. This further enhances the overall in-plane stiffness and bending and torsional resistance of the battery pack, thereby helping to increase its natural frequency and avoid resonance risks.

[0061] In some embodiments of this application, the battery pack further includes an elastic filler 40, which fills and is disposed in the gap between the battery module 20 and the receiving cavity 101 to tightly bond the battery module 20 and the wall of the receiving cavity 101 into a whole. This is equivalent to adding an elastic support point between the battery module 20 and the housing 1, which enhances the rigid connection inside the battery pack, suppresses the relative displacement of the battery module 20 under vibration, thereby effectively improving the overall structural stiffness and natural frequency of the battery pack and helping to avoid harmful resonance.

[0062] Based on the above embodiments, the battery pack further includes an elastic filler 40, which fills the gap between the battery module 20 and the receiving cavity 101 to eliminate the gap between them. When a lateral impact occurs, the housing 1 deforms inward. The elastic filler 40 is sandwiched between the deformed housing 1 and the battery module 20, absorbing impact energy through its own compression deformation, thereby reducing the impact acceleration and impact force acting on the battery module 20.

[0063] For example, the elastic filler 40 can be foam, silicone rubber, and sealant, etc. Figure 11 As shown, when the elastic filler 40 is a foam, the material property curve of the foam indicates that its stress remains at a low level until its overall deformation reaches 70%.

[0064] In some aspects of this application, this application also provides a vehicle that includes a battery pack as described in any of the above technical solutions. Since the battery pack housing of the battery pack in this vehicle has the same technical features as the battery pack housing described in the aforementioned technical solutions, the two can solve the same technical problems and achieve the same technical effects.

[0065] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0066] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims. Furthermore, specific examples have been used in the specification to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application, and the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack housing, characterized in that, The battery pack housing includes: case; An internal frame is disposed within the housing and connected to the housing; A reinforcing structure is provided inside the housing and connected to the inner frame; An exoskeleton is disposed outside the housing and connected to the housing.

2. The battery pack housing according to claim 1, characterized in that, The internal skeleton includes: Multiple horizontal frames extend along a first direction and are spaced apart along a second direction; Multiple longitudinal frames extend along the second direction and are spaced apart in the first direction, with each longitudinal frame connected to all the transverse frames; Wherein, the first direction and the second direction are perpendicular.

3. The battery pack housing according to claim 2, characterized in that, The cross frame is provided with a plurality of first reinforcing parts on at least one side in the second direction, and the plurality of first reinforcing parts are spaced apart along the first direction; And / or, The longitudinal frame has a plurality of second reinforcing parts on at least one side in the first direction, and the plurality of second reinforcing parts are spaced apart along the second direction.

4. The battery pack housing according to claim 1, characterized in that, The reinforcing structure includes: Multiple crossbeams extend along a first direction and are spaced apart in a second direction; At least one longitudinal beam is connected to all of the said transverse beams; In this configuration, at least one of the crossbeams and the longitudinal beams is fixedly connected to the inner frame, and the first direction and the second direction are perpendicular to each other.

5. The battery pack housing according to claim 4, characterized in that, The internal skeleton includes: Multiple horizontal frames extend along a first direction and are spaced apart along a second direction; Multiple longitudinal frames extend along the second direction and are spaced apart in the first direction. Each longitudinal frame is connected to all the transverse frames. The multiple longitudinal frames include two end longitudinal frames located on the outermost side in the first direction. Two inner side beams are disposed between the corresponding end longitudinal frame and the cross beam, and both extend along the second direction; Wherein, the crossbeam is connected to the corresponding cross frame, and / or the longitudinal beam is connected to the corresponding longitudinal frame.

6. The battery pack housing according to claim 5, characterized in that, Both ends of the crossbeam are provided with notches; when the crossbeam is connected to the corresponding cross frame, one of the two inner side beams is located at one of the notches and is pressed against one of the end longitudinal frames by the crossbeam, and the other of the two inner side beams is located at the other notch and is pressed against the other end longitudinal frame by the crossbeam.

7. The battery pack housing according to claim 5, characterized in that, The inner beam includes a beam body, and a first lap plate and a second lap plate disposed on both sides of the beam body in the second direction. The first lap plate and the second lap plate extend in a direction away from each other, and the first lap plate is disposed close to the longitudinal beam relative to the second lap plate. The shell has a first edge and a second edge disposed opposite to each other in the second direction. When the crossbeam is connected to the corresponding cross frame, The first lap plate on one of the two inner side beams overlaps the corresponding end longitudinal frame, and the second lap plate overlaps the first edge; The first lap plate on the other inner side beam of the two inner side beams overlaps on the corresponding end longitudinal frame, and the second lap plate overlaps on the second edge.

8. The battery pack housing according to claim 4, characterized in that, The reinforcing structure further includes at least one of a mounting point assembly and a connector, wherein the mounting point assembly is disposed on the crossbeam and is used to connect to the vehicle body; the connector is disposed at the intersection of the crossbeam and the longitudinal beam to connect the crossbeam and the longitudinal beam.

9. The battery pack housing according to claim 1, characterized in that, The housing has a first edge and a second edge disposed opposite each other in a second direction; the outer frame includes: Two outer side beams are both disposed on the outside of the housing and are arranged opposite each other along the second direction. One of the two outer side beams is disposed below the first edge, and the other of the two outer side beams is disposed below the second edge.

10. The battery pack housing according to claim 9, characterized in that, The housing has a first side and a second side disposed opposite each other in a first direction, and the outer frame further includes: Multiple first mounting structures are spaced apart on the first side and located outside the housing; Multiple second mounting structures are spaced apart on the second side and located outside the housing; Wherein, the first direction and the second direction are perpendicular.

11. A battery pack, characterized in that, The battery pack includes: The battery pack housing as described in any one of claims 1 to 10, wherein the reinforcing structure is used to divide the internal space of the housing into a plurality of receiving sub-cavities; A liquid cooling plate is disposed between the inner frame and the reinforcing structure, and is connected to the inner frame; The battery module is housed in a cavity between two adjacent crossbeams and is in thermal contact with the liquid cooling plate.

12. The battery pack according to claim 11, characterized in that, The battery pack also includes: An elastic filler is provided to fill the gap between the battery module and the receiving cavity.

13. A vehicle, characterized in that, The vehicles include: The battery pack as described in claim 11 or 12.

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