Power battery system and vehicle

Abstract

The invention provides a power battery system and a vehicle, and relates to the technical field of vehicles, the power battery system comprises: an upper box body, the upper box body is provided with an upper pressing plate; the lower box body is provided with a lower pressing plate; the connecting assembly is sequentially connected with the upper pressing plate, the upper box body, the lower box body and the lower pressing plate in the thickness direction of the upper box body; the sealing assembly is arranged between the upper pressing plate and the lower box body; by means of the technical scheme, when the commercial vehicle encounters the torsion working condition, displacement and deformation of the lower box body relative to the upper box body are absorbed and slowly released by the sealing assembly and the buffering assembly, it is guaranteed that the upper box body is not directly impacted, the stress level is greatly reduced, and the service life of the commercial vehicle is prolonged. The potential structure cracking risk is effectively prevented, and the problem that in the prior art, a power battery system is prone to failure under the torsion working condition is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a power battery system and a vehicle. BACKGROUND

[0002] In the current power automobile industry, especially in the field of new energy commercial vehicles, the power battery system, as a core component of vehicle operation, must face various complex and harsh working conditions. These environments not only include the road bumps, dust, and water encountered in daily driving, but also include the water immersion situation in specific occasions. For commercial vehicles, their application scenarios are often more severe, such as in coal and sandstone markets and other environments, where vehicles are subjected to more frequent vibration, dust invasion, and potential water intrusion, which undoubtedly puts higher requirements on the protection performance of the battery system.

[0003] The battery pack, as a device that stores a large amount of electrical energy, contains numerous sensitive electrical components and flammable substances inside. Once affected by external moisture or dust, it may cause short circuits, fires, or even explosions, posing a significant threat to personal and property safety. Therefore, the protection design of the battery pack, especially the waterproof and dustproof design, must meet the higher protection level required by the industry to ensure the safety and reliability of the battery system.

[0004] In the existing design of the bottom-hung power battery system of a commercial vehicle, the upper and lower boxes are usually directly connected by bolts. Although this rigid connection method ensures the stability of the structure, when the vehicle encounters a twist (i.e., the vehicle frame produces relative displacement at different parts under twisted working conditions), the force received by the lower box will be directly transmitted to the upper box due to the close connection between the upper and lower boxes. Under extreme twist conditions, this force transmission may cause high stress areas in the upper box, with a maximum stress value of 1000 Mpa, far exceeding the yield strength of non-metallic or thin-walled metallic materials. As a result, the upper box may crack, causing the entire sealing system to fail and unable to effectively block the external environment from affecting the battery pack.

[0005] Therefore, how to improve the protection capability of the power battery system under the twist working condition of the whole vehicle while maintaining the integrity of the structure has become a key technical problem to be solved. SUMMARY

[0006] The main purpose of the present application is to provide a power battery system and a vehicle to solve the problem that the power battery system in the prior art is prone to failure under twist working conditions.

[0007] In order to achieve the above object, according to one aspect of the present application, a power battery system is provided, comprising: an upper box body, the upper box body being provided with an upper pressing plate; a lower box body, the lower box body being provided with a lower pressing plate; a connecting assembly, the connecting assembly being sequentially connected with the upper pressing plate, the upper box body, the lower box body and the lower pressing plate along the thickness direction of the upper box body; a sealing assembly, the sealing assembly being arranged between the upper pressing plate and the lower box body; and a buffer assembly, the buffer assembly being arranged between the lower box body and the lower pressing plate.

[0008] Further, the lower box body comprises a lower box body body, the lower box body body having a sleeve hole, and the connecting assembly comprises: a sleeve, the sleeve being arranged in the sleeve hole, the sleeve being arranged between the upper box body and the lower pressing plate, and the sleeve being connected with the lower pressing plate; a first connecting piece, part of the first connecting piece being arranged in the sleeve, and the first connecting piece being sequentially connected with the upper pressing plate, the upper box body, the lower box body and the lower pressing plate along the thickness direction of the upper box body; and a second connecting piece, the second connecting piece being detachably connected with the first connecting piece.

[0009] Further, the upper pressing plate comprises: an upper pressing plate body, the upper pressing plate body being arranged along the length direction of the upper box body; and an upper pressing plate bending segment, one end of the upper pressing plate bending segment being connected with the upper pressing plate body, and the other end of the upper pressing plate bending segment being arranged extendingly towards the lower box body along the thickness direction of the upper box body; wherein the second end of the upper pressing plate bending segment is arranged distantly from the lower box body.

[0010] Further, the lower pressing plate comprises: a lower pressing plate body, the lower pressing plate body being arranged along the length direction of the upper box body, and the sleeve being connected with the lower pressing plate body; and a lower pressing plate bending segment, one end of the lower pressing plate bending segment being connected with the lower pressing plate body, and the other end of the lower pressing plate bending segment being arranged extendingly towards the lower box body along the thickness direction of the upper box body; wherein the second end of the lower pressing plate bending segment is arranged distantly from the lower box body.

[0011] Further, the sealing assembly comprises: a sealing gasket, the sealing gasket being arranged between the upper pressing plate and the lower box body, the thickness of the sealing gasket being h1, and the distance between the second end of the upper pressing plate bending segment and the surface of the lower box body being d1, wherein 0.3h1≤d1≤0.7h1.

[0012] Further, the buffer assembly comprises: a buffer gasket, the buffer gasket being arranged between the lower box body and the lower pressing plate, the thickness of the buffer gasket being h2, and the distance between the second end of the lower pressing plate bending segment and the surface of the lower box body being d2, wherein 0.3h2≤d2≤0.7h2.

[0013] Further, the thickness of the sealing gasket is h1, and the thickness of the buffer gasket is h2, wherein h1=h2.

[0014] Further, the sealing gasket is made of silicon foam, and / or the buffer gasket is made of silicon foam, and / or the upper pressing plate is made of metal, and / or the lower pressing plate is made of metal, and / or the sleeve is made of metal.

[0015] Further, the sleeve hole is a circular hole or a polygonal hole, and the sleeve is arranged correspondingly to the sleeve hole.

[0016] According to another aspect of the present application, a vehicle is provided, comprising the power battery system as described above.

[0017] According to the technical solution of the present application, the sealing assembly is arranged between the upper pressing plate and the lower box body, and the buffer assembly is arranged between the lower box body and the lower pressing plate, so as to build a basic suspension isolation layer. The upper pressing plate, the upper box body, the lower box body and the lower pressing plate are sequentially fixed in the thickness direction of the upper box body by the connecting assembly, so as to form a stable connection system. When the commercial vehicle encounters a torsion condition, the displacement and deformation of the lower box body relative to the upper box body are absorbed and released by the sealing assembly and the buffer assembly, so as to ensure that the upper box body is not directly impacted, greatly reduce the stress level, effectively prevent the potential risk of structural cracking, and solve the problem that the power battery system in the prior art is prone to failure under a torsion condition. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the present application, serve to explain the present application, and do not constitute improper limitations to the present application. In the drawings: Figure 1 A structural schematic diagram of an embodiment of the power battery system according to the present application is shown; Figure 2 An enlarged view of A in FIG. 1 is shown. Figure 1 An enlarged view of A in FIG. 1 is shown.

[0019] In the above drawings, the following reference signs are used: 10, upper box body; 100, upper box body body; 11, upper pressing plate; 110, upper pressing plate body; 111, upper pressing plate bending section; 20, lower box body; 200, lower box body body; 201, sleeve hole; 21, lower pressing plate; 210, lower pressing plate body; 211, lower pressing plate bending section; 30, connecting assembly; 31, first connecting piece; 32, second connecting piece; 33, sleeve; 40, sealing assembly; 41, sealing gasket; 50, buffer assembly; 51. A cushion. DETAILED DESCRIPTION

[0020] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail with reference to the accompanying drawings and embodiments.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprise" and / or "include" when used herein specify the presence of stated features, steps, operations, devices, components and / or combinations thereof.

[0022] It should be noted that the terms "first", "second", and the like in the description of the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged as appropriate, so that the embodiments of the present application described herein can be implemented, for example, in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to such a process, method, product, or device.

[0023] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in various different forms, and should not be interpreted as being limited to only the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concepts of these exemplary embodiments are sufficiently conveyed to those of ordinary skill in the art, and in the drawings, the thicknesses of layers and regions can be exaggerated for clarity, and the same reference numerals are used to denote the same elements, so that a description thereof will be omitted.

[0024] In conjunction with Figures 1 to 2 In a specific embodiment of the present application, a power battery system is provided.

[0025] Specifically, the power battery system comprises an upper box body 10, a lower box body 20, a connecting assembly 30, a sealing assembly 40 and a buffer assembly 50, the upper box body 10 is provided with an upper pressing plate 11, the lower box body 20 is provided with a lower pressing plate 21, the connecting assembly 30 is sequentially connected with the upper pressing plate 11, the upper box body 10, the lower box body 20 and the lower pressing plate 21 along the thickness direction of the upper box body 10, the sealing assembly 40 is arranged between the upper pressing plate 11 and the lower box body 20, and the buffer assembly 50 is arranged between the lower box body 20 and the lower pressing plate 21.

[0026] In the embodiment, the sealing assembly 40 is arranged between the upper pressing plate 11 and the lower box body 20, and the buffer assembly 50 is arranged between the lower box body 20 and the lower pressing plate 21, so as to construct a basic suspension isolation layer, the upper pressing plate 11, the upper box body 10, the lower box body 20 and the lower pressing plate 21 are sequentially fixed along the thickness direction of the upper box body 10 by the connecting assembly 30, and a stable connection system is formed. When the commercial vehicle encounters a torsion condition, the displacement and deformation of the lower box body 20 relative to the upper box body 10 are absorbed and released by the sealing assembly 40 and the buffer assembly 50, so as to ensure that the upper box body 10 is not directly impacted, the stress level is greatly reduced, and the potential risk of structural cracking is effectively prevented. The elastic recovery performance of the sealing assembly 40 can still maintain the integrity and air tightness of the box body sealing interface even in a dynamically changing working condition, and the IP protection level standard is met, so that the adaptability and safety of the power battery system to the complex commercial vehicle environment are strengthened, the reliability and durability performance of the entire system are significantly improved, and the problem that the power battery system in the prior art is prone to failure under a torsion condition is solved.

[0027] In combination with Figure 1 As shown in the figure, the upper box body 10 comprises an upper box body body 100, the upper pressing plate 11, the upper box body body 100, the lower box body 20 and the lower pressing plate 21 are sequentially fixed along the thickness direction of the upper box body 10 by the connecting assembly 30, and a stable connection system is formed. When the commercial vehicle encounters a torsion condition, that is, one side of the vehicle frame is forced to displace upward and the other side remains unchanged, the displacement and deformation of the lower box body 20 relative to the upper box body 10 are absorbed and released by the sealing assembly 40 and the buffer assembly 50, so as to ensure that the upper box body 10 is not directly impacted, the stress level is greatly reduced, and the potential risk of structural cracking is effectively prevented.

[0028] Further, the lower box body 20 comprises a lower box body 200 having a sleeve hole 201, the connecting assembly 30 comprises a first connecting piece 31, a second connecting piece 32 and a sleeve 33, the sleeve 33 is arranged in the sleeve hole 201, the sleeve 33 is arranged between the upper box body 10 and the lower pressing plate 21, and the sleeve 33 is connected with the lower pressing plate 21; part of the first connecting piece 31 is arranged in the sleeve 33, and the first connecting piece 31 is connected with the upper pressing plate 11, the upper box body 10, the lower box body 20 and the lower pressing plate 21 in sequence along the thickness direction of the upper box body 10; and the second connecting piece 32 is detachably connected with the first connecting piece 31.

[0029] In the embodiment, the lower box body 20 comprises a lower box body 200, which is designed with a sleeve hole 201 for matching the sleeve 33 in the connecting assembly 30. The sleeve 33 is arranged inside the sleeve hole 201, between the upper box body 10 and the lower pressing plate 21, and forms a stable connection with the lower pressing plate 21. The first connecting piece 31 passes through the sleeve 33, and connects the upper pressing plate 11, the upper box body 10, the lower box body 20 and the lower pressing plate 21 in sequence along the thickness direction of the upper box body 10, to realize close integration. In addition, the second connecting piece 32 is detachably connected with the first connecting piece 31, facilitating maintenance and adjustment. Through the combination of the sleeve 33 and the sleeve hole 201, the displacement of the lower box body 20 under the torsion condition of the whole vehicle is effectively controlled, ensuring that the sealing assembly 40 and the buffer assembly 50 always work within the designed compression range, so as to maintain good sealing performance under dynamic conditions, avoid cracking of the upper box body 10 due to high stress generated by the working condition, and significantly enhance the sealing reliability and service life of the commercial vehicle bottom-hung power battery system in complex environments.

[0030] In combination Figure 1 In the embodiment, the first connecting piece 31 is a bolt, and the second connecting piece 32 is a nut, facilitating maintenance and adjustment. Through the combination of the sleeve 33 and the sleeve hole 201, the displacement of the lower box body 20 under the torsion condition of the whole vehicle is effectively controlled, ensuring that the sealing assembly 40 and the buffer assembly 50 always work within the designed compression range, so as to maintain good sealing performance under dynamic conditions, avoid cracking of the upper box body 10 due to high stress generated by the working condition, and significantly enhance the sealing reliability and service life of the commercial vehicle bottom-hung power battery system in complex environments.

[0031] Further, the upper pressing plate 11 comprises an upper pressing plate body 110 and an upper pressing plate bending segment 111, the upper pressing plate body 110 is arranged along the length direction of the upper box body 10; one end of the upper pressing plate bending segment 111 is connected with the upper pressing plate body 110, and the other end of the upper pressing plate bending segment 111 is arranged in an extending manner along the thickness direction of the upper box body 10 towards the lower box body 20; and the second end of the upper pressing plate bending segment 111 is arranged away from the lower box body 20.

[0032] In the embodiment, the end of the upper pressing plate bending section 111 is kept at a distance from the lower box body 20, forming a non-contact connection mode. In combination with the characteristics of the sealing assembly 40 and the buffer assembly 50, it is ensured that the sealing assembly 40 and the buffer assembly 50 are always kept within the designed compression range when the vehicle is subjected to the torsion test. When the commercial vehicle is subjected to the torsion test, the displacement of the lower box body 20 is first absorbed by the sealing gasket and the buffer gasket, especially in the Z-direction displacement. Through the compression and relaxation of the elastic material, the impact force transmitted to the box body is effectively relieved. At the same time, the XY-direction displacement is buffered through the structural characteristics of the sleeve hole 201 and the sleeve 33, avoiding stress concentration caused by direct rigid contact. This working process ensures that the upper box body 10 is not significantly affected under the torsion test, avoiding sealing failure caused by structural deformation, thereby significantly enhancing the sealing reliability and safety of the bottom-hung power battery system under complex and severe working conditions.

[0033] Further, the lower pressing plate 21 comprises a lower pressing plate body 210 and a lower pressing plate bending section 211. The lower pressing plate body 210 is arranged along the length direction of the upper box body 10, and the sleeve 33 is connected with the lower pressing plate body 210. One end of the lower pressing plate bending section 211 is connected with the lower pressing plate body 210, and the other end of the lower pressing plate bending section 211 is arranged extendingly along the thickness direction of the upper box body 10 towards the lower box body 20. The second end of the lower pressing plate bending section 211 is arranged at a distance from the lower box body 20.

[0034] In the embodiment, the second end of the lower pressing plate bending section 211 is arranged at a distance from the lower box body 20, in combination with the characteristics of the sealing assembly 40 and the buffer assembly 50, it is ensured that the sealing assembly 40 and the buffer assembly 50 are always kept within the designed compression range when the vehicle is subjected to the torsion test. The XY-direction displacement is buffered through the structural characteristics of the sleeve hole 201 and the sleeve 33, avoiding stress concentration caused by direct rigid contact, while the Z-direction displacement is absorbed through the elastic deformation of the sealing assembly 40 and the buffer assembly 50. In this way, even when the commercial vehicle faces extreme working conditions, direct hard contact between the upper and lower box bodies can be effectively avoided, reducing the risk of structural damage to the upper box body 10 due to excessive stress concentration, thereby ensuring the reliability of the box sealing structure and the safety of the entire power battery system.

[0035] Further, the sealing assembly 40 comprises a sealing gasket 41 arranged between the upper pressing plate 11 and the lower box body 20. The thickness of the sealing gasket 41 is h1, and the distance between the second end of the upper pressing plate bending section 111 and the surface of the lower box body 20 is d1, wherein 0.3h1≤d1≤0.7h1.

[0036] In combination with Figure 1 and Figure 2As shown, the sealing gasket 41 is arranged between the upper pressing plate 11 and the lower box body 20 to provide effective insulation and sealing effect. The initial thickness of the sealing gasket 41 is defined as h1, and in order to ensure that the sealing gasket 41 can play the best sealing effect under various working conditions, the upper pressing plate 11 includes an upper pressing plate bending section 111, and there is a specific distance d1 between the second end of the upper pressing plate bending section 111 and the surface of the lower box body 20, which is strictly controlled within the range of 30% to 70% of the thickness of the sealing gasket 41, that is, it satisfies the condition 0.3h1≤d1≤0.7h1. The setting of this distance ensures that the compression degree of the sealing gasket 41 is in the optimal working interval when it is extruded, neither over-pressing to cause damage to the sealing gasket 41 or loss of sealing ability, nor under-pressing to fail to form an effective sealing layer.

[0037] Further, the buffer assembly 50 includes a buffer gasket 51 arranged between the lower box body 20 and the lower pressing plate 21, the thickness of the buffer gasket 51 is h2, and the distance between the second end of the lower pressing plate bending section 211 and the surface of the lower box body 20 is d2, wherein 0.3h2≤d2≤0.7h2.

[0038] In combination Figure 1 and Figure 2 As shown, the buffer assembly 50 includes a buffer gasket 51 arranged between the lower box body 20 and the lower pressing plate 21 to absorb and relieve the Z-direction displacement of the lower box body 20 under the torsion working condition of the commercial vehicle. The thickness h2 of the buffer gasket 51 and the distance d2 between the second end of the lower pressing plate bending section 211 and the surface of the lower box body 20 maintain a specific proportional relationship, that is, 0.3h2≤d2≤0.7h2, and the setting of this proportion ensures that the buffer gasket 51 can work effectively within the designed compression interval when it bears dynamic displacement, neither over-compression to cause permanent deformation, nor under-compression to lose the buffering effect. Through this buffering structure, even under severe dynamic working conditions, the sealing between the upper box body 10 and the lower box body 20 can be maintained, avoiding the risk of air tightness failure caused by the structural cracking of the upper box body 10, and significantly improving the safety and reliability of the bottom-hung power battery system under complex working conditions. In addition, the flexibility of this design also lies in that it can adapt to different working condition requirements, and by adjusting the thickness h2 of the buffer gasket 51 and the proportion of the distance d2 between the lower pressing plate bending section 211 and the surface of the lower box body 20, the buffering effect can be optimized to meet a wider range of commercial vehicle application scenarios.

[0039] Further, the thickness of the sealing gasket 41 is h1, and the thickness of the buffer gasket 51 is h2, wherein h1=h2.

[0040] In the embodiment, the thickness of the sealing gasket 41 and the buffer gasket 51 is designed to be equal, so that the relative displacement between the upper box body 10 and the lower box body 20 is effectively absorbed and limited under the whole vehicle torsion condition of the commercial vehicle, and through the joint action of the sealing gasket 41 and the buffer gasket 51, it is ensured that the upper box body 10 is not affected by forced displacement, and the problem of sealing failure of the power battery system caused by deformation or cracking of the upper box body 10 is avoided. Specifically, when the frame generates displacement under the torsion condition, the displacement of the lower box body 20 is conducted to the lower box body 20 through the power battery bracket, and the Z-direction displacement of the lower box body 20 is absorbed by the sealing gasket 41 and the buffer gasket 51, and the XY-direction displacement is controlled through the limiting structure of the sleeve hole 201 and the sleeve 33, which ensures that the upper box body 10 remains stable under the working condition change and does not produce displacement and deformation.

[0041] Further, the sealing gasket 41 is made of silicon foam, the buffer gasket 51 is made of silicon foam, the upper pressing plate 11 is made of metal, the lower pressing plate 21 is made of metal, and the sleeve 33 is made of metal.

[0042] By introducing the sealing gasket 41 and the buffer gasket 51 between the upper box body and the lower box body, the sealing gasket 41 is preferably made of silicon foam material, which can effectively absorb and relieve the impact of Z-direction displacement, and the buffer gasket 51 is also made of silicon foam material, which aims to further enhance the anti-vibration ability of the whole system. The upper pressing plate 11 and the lower pressing plate 21 are made of metal material, which increases the overall rigidity of the system and helps to accurately control the XY-direction displacement. The sleeve 33 made of metal not only strengthens the connection strength, but also plays a key role in displacement limitation. This structural innovation enables the displacement of the lower box body 20 under the torsion condition to be absorbed by elastic elements and structural gaps, rather than being directly transmitted to the upper box body 10, thereby avoiding the problem of sealing failure caused by deformation of the upper box body. Of course, silicon foam and metal materials are only preferred embodiments, and for different application scenarios and needs, various suitable elastic materials and high-strength materials can be selected to achieve the best protection effect.

[0043] Further, the sleeve hole 201 is a circular hole or a polygonal hole, and the sleeve 33 is correspondingly arranged in the sleeve hole 201.

[0044] Specifically, the sleeve hole 201 can be but is not limited to a circular hole, a square hole, a hexagonal hole, an octagonal hole, etc. The precise fit of the sleeve hole 201 and the sleeve 33 will not cause connection failure or structural damage, ensuring that the displacement of the lower box body 20 can be reasonably absorbed and controlled under dynamic conditions, avoiding the transmission of excess stress to the upper box body 10, thereby protecting the structural integrity of the upper box body 10 and preventing it from cracking or deforming under high-strength conditions. Further, the sealing effect of the non-metallic material or thin-walled metal material box body is further guaranteed, meeting the requirements of high protection level.

[0045] In another embodiment of the present application, a vehicle is also provided, comprising the power battery system in the above embodiments.

[0046] Specifically, the power battery system comprises an upper box body 10, a lower box body 20, a connecting assembly 30, a sealing assembly 40 and a buffer assembly 50, the upper box body 10 is provided with an upper pressing plate 11, the lower box body 20 is provided with a lower pressing plate 21, the connecting assembly 30 is connected in sequence along the thickness direction of the upper box body 10, the upper pressing plate 11, the upper box body 10, the lower box body 20 and the lower pressing plate 21, the sealing assembly 40 is arranged between the upper pressing plate 11 and the lower box body 20, and the buffer assembly 50 is arranged between the lower box body 20 and the lower pressing plate 21.

[0047] In the embodiment, the sealing assembly 40 is arranged between the upper pressing plate 11 and the lower box body 20, and the buffer assembly 50 is arranged between the lower box body 20 and the lower pressing plate 21, so as to build a basic suspension isolation layer, and the connecting assembly 30 is used to fix the upper pressing plate 11, the upper box body 10, the lower box body 20 and the lower pressing plate 21 in sequence along the thickness direction of the upper box body 10, so as to form a stable connection system. When the commercial vehicle encounters a torsion condition, the displacement and deformation of the lower box body 20 relative to the upper box body 10 are absorbed and released by the sealing assembly 40 and the buffer assembly 50, so as to ensure that the upper box body 10 is not directly impacted, greatly reduce the stress level, and effectively prevent the potential risk of structural cracking. The elastic recovery performance of the sealing assembly 40 can still maintain the integrity and air tightness of the box body sealing interface even in a dynamically changing working condition, so as to meet the IP protection level standard, thereby enhancing the adaptability and safety of the power battery system to the complex commercial vehicle environment, and significantly improving the reliability and durability performance of the entire system, thereby solving the problem that the power battery system in the prior art is prone to failure under the torsion condition.

[0048] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects: 1) Enhance sealing reliability: by arranging the sealing gasket 41 between the upper pressing plate 11 and the lower box body 20 and limiting its working range in the 30%-70% compression interval, it is ensured that the sealing assembly 40 can maintain stable sealing performance even under extreme whole vehicle torsion conditions, avoiding the box body from being damp or contaminated by pollutants due to environmental factors, greatly improving the waterproof and dustproof capability of the power battery system, and meeting the high requirements of the IP protection standard.

[0049] 2) Reduce the risk of structural damage: by using the design of the buffer gasket 51 and the upper and lower pressing plates (the upper pressing plate 11 and the lower pressing plate 21), the impact and vibration in the Z direction are effectively dispersed, the structural cracking of the upper box body 10 caused by excessive stress is avoided, the non-metal or thin-walled metal box body is protected from damage, and the structural stability and service life of the entire system are enhanced.

[0050] 3) Optimized displacement absorption: through the precise fit of the sleeve hole 201 and the sleeve 33, the displacement of the lower box 20 in the XY direction can be absorbed without affecting the position and shape of the upper box 10, which not only ensures the effectiveness of the box sealing, but also improves the dynamic adaptability of the system, so that it can still work efficiently when experiencing complex environmental changes.

[0051] For the purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical", "horizontal", and derivatives thereof shall relate to the application as oriented in the drawings. However, it is to be understood that the application can assume various alternative orientations and, accordingly, such terms are not to be taken as limitations of the present application, except where so expressly defined by the specification. All such modifications and variations are considered to be within the scope of the application, the scope of which is to be interpreted in the broadest sense and under the doctrine of equivalents.

[0052] In addition, it should be understood that embodiments described herein should be understood as being illustrative of the broader principles of the present application, and not limiting. Variations and modifications can be made in the embodiments described herein without departing from the spirit or scope of the present application. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense. The disclosure covers various modifications and alternative methods of practicing the application. The disclosure covers each individual feature, system, material, or method described herein. Any one or more of such features, systems, materials, or methods can be combined in any combination. The combination of any feature, system, material, or method from one example can be combined with any feature, system, material, or method from another example. Any feature, system, material, or method that can be present in one example can also be present in another example. The disclosure covers each individual feature, system, material, or method described herein. Any one or more of such features, systems, materials, or methods can be combined in any combination. The combination of any feature, system, material, or method from one example can be combined with any feature, system, material, or method from another example. Any feature, system, material, or method that can be present in one example can also be present in another example.

[0053] In the above embodiments, the description of each embodiment is focused on one aspect, and the part not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0054] The above only describes preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power battery system, characterized in that, include: Upper housing (10), the upper housing (10) is provided with an upper pressure plate (11); The lower housing (20) is provided with a lower pressure plate (21). A connecting component (30) is provided, which sequentially connects the upper pressure plate (11), the upper box (10), the lower box (20), and the lower pressure plate (21) along the thickness direction of the upper box (10). A sealing assembly (40) is disposed between the upper pressure plate (11) and the lower housing (20); A buffer assembly (50) is disposed between the lower housing (20) and the lower pressure plate (21).

2. The power battery system according to claim 1, characterized in that, The lower housing (20) includes a lower housing body (200), the lower housing body (200) having a sleeve hole (201), and the connecting assembly (30) includes: Sleeve (33), the sleeve (33) is inserted into the sleeve hole (201), the sleeve (33) is disposed between the upper box (10) and the lower pressure plate (21), and the sleeve (33) is connected to the lower pressure plate (21); The first connector (31) is partially inserted into the sleeve (33). The first connector (31) is connected to the upper pressure plate (11), the upper box (10), the lower box (20) and the lower pressure plate (21) in sequence along the thickness direction of the upper box (10). The second connector (32) is detachably connected to the first connector (31).

3. The power battery system according to claim 2, characterized in that, The upper pressure plate (11) includes: The upper pressure plate body (110) is arranged along the length direction of the upper box body (10); The upper pressure plate bending section (111) has one end connected to the upper pressure plate body (110) and the other end of the upper pressure plate bending section (111) extends toward the lower box body (20) along the thickness direction of the upper box body (10). The second end of the upper pressure plate bending section (111) is positioned at a distance from the lower box body (20).

4. The power battery system according to claim 3, characterized in that, The lower pressure plate (21) includes: The lower pressure plate body (210) is arranged along the length direction of the upper box (10), and the sleeve (33) is connected to the lower pressure plate body (210); The lower pressure plate bending section (211) has one end connected to the lower pressure plate body (210) and the other end of the lower pressure plate bending section (211) extends toward the lower box body (20) along the thickness direction of the upper box body (10). The second end of the bent section (211) of the lower pressure plate is positioned at a distance from the lower housing (20).

5. The power battery system according to claim 4, characterized in that, The sealing assembly (40) includes: A sealing gasket (41) is disposed between the upper pressure plate (11) and the lower housing (20). The thickness of the sealing gasket (41) is h1. The distance between the second end of the bent section (111) of the upper pressure plate and the surface of the lower housing (20) is d1, wherein 0.3h1≤d1≤0.7h1.

6. The power battery system according to claim 5, characterized in that, The buffer component (50) includes: A buffer pad (51) is disposed between the lower housing (20) and the lower pressure plate (21). The thickness of the buffer pad (51) is h2. The distance between the second end of the bent section (211) of the lower pressure plate and the surface of the lower housing (20) is d2, wherein 0.3h2≤d2≤0.7h2.

7. The power battery system according to claim 6, characterized in that, The thickness of the sealing gasket (41) is h1, and the thickness of the buffer gasket (51) is h2, wherein h1=h2.

8. The power battery system according to claim 6 or 7, characterized in that, The sealing gasket (41) is made of silicone foam, and / or the buffer pad (51) is made of silicone foam, and / or the upper pressure plate (11) is made of metal, and / or the lower pressure plate (21) is made of metal, and / or the sleeve (33) is made of metal.

9. The power battery system according to any one of claims 2 to 7, characterized in that, The sleeve hole (201) is a circular hole or a polygonal hole, and the sleeve (33) is provided correspondingly to the sleeve hole (201).

10. A vehicle, comprising a power battery system, characterized in that, The power battery system is the power battery system according to any one of claims 1 to 9.

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