Battery pack box body and vehicle

Abstract

The utility model provides a battery pack box body and a vehicle, and relates to the technical field of power batteries. The battery pack box body comprises a plurality of battery modules and a box body bottom plate, the plurality of battery modules are arranged on the box body bottom plate, the box body bottom plate is of a cavity structure, a reinforcing rib is correspondingly arranged in the cavity structure where each end plate is located, and the end plates are fixed on the reinforcing ribs. The reinforcing ribs are used for fixing the end plates and enhancing the rigidity of the whole battery module. The reinforcing ribs are arranged in the bottom plate of the box body, and the end plate is directly fixed on the reinforcing ribs, so that an additional cross beam is not needed to install the end plate, and the space is saved. By saving the space, more battery modules can be placed in the same volume, so that the energy density of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, and particularly relates to a battery pack box body and a vehicle. BACKGROUND

[0002] With the development of the new energy industry, the application field of batteries is wider. Generally, in automobile use, the required battery energy is higher, so multiple battery modules need to be integrated and configured in the box body of the battery pack. The battery pack includes a box body and a box cover, and at least two battery modules are generally installed in the box body. The battery modules are electrically connected in series or parallel, so as to adapt to the power demand of new energy vehicles. However, when multiple battery modules are integrated in the battery pack box body, the stability thereof needs to be designed, and the stability of the battery pack is required to be higher in harsh working conditions such as mines. At present, the battery pack box body is generally made of low-side beam profile box body or stamping box body. In order to make the internal structure of the battery pack more stable, end plates are arranged at both ends of the battery module to enhance the rigidity of the battery module. However, the space utilization of the current battery pack box body design is low, which reduces the energy density.

[0003] Therefore, it is urgent to provide a battery pack box body which can meet the rigidity requirement and improve the space utilization of the battery pack. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a battery pack box body to solve the problem of low space utilization of the battery pack, thereby improving the energy density.

[0005] In a first aspect, the present application provides a battery pack box body, which comprises: multiple battery modules, the battery module comprising: multiple stacked single cells and an end plate, wherein the cells are arranged in a single column, and the end plate is arranged at both ends in a first direction, and the first direction is the stacking direction of the cells; a box body bottom plate, the multiple battery modules are arranged on the box body bottom plate, the box body bottom plate is a cavity structure, and a reinforcing rib is arranged in the cavity structure at the position of each end plate, and the end plate is fixed on the reinforcing rib.

[0006] By the above scheme, since the end plate is arranged at both ends of each battery module and fixed on the corresponding reinforcing rib, the rigidity requirement of the battery module is met, and the bottom plate of the box body is designed as a cavity structure, allowing the internal structure to be increased without increasing the external volume. The reinforcing rib is arranged in the cavity structure at the position of each end plate, and the reinforcing rib is used to fix the end plate and enhance the rigidity of the entire battery module. Since the reinforcing rib is arranged inside the bottom plate of the box body, the end plate is directly fixed on the reinforcing rib, so that an additional cross beam for mounting the end plate is not needed, thereby saving space. By saving space, more battery modules can be placed in the same volume, thereby improving the energy density of the battery pack. The fixing mode of the end plate provides better structural stability, which is crucial for the battery pack to maintain performance when subjected to impact or vibration. Since the reinforcing rib is arranged inside the bottom plate of the box body, the end plate is fixed on the reinforcing rib, and an additional cross beam for mounting the end plate is not needed, thereby saving space and improving the space utilization of the battery pack box.

[0007] In a possible design, the end plate has a bottom in contact with the bottom plate of the box body and a top away from the bottom plate of the box body, and a protruding structure is arranged on the top, the protruding structure being raised from the top of the end plate by a first preset distance, and the upper surface of the protruding structure having a first threaded hole for mounting a bolt assembly.

[0008] By the above scheme, the protruding structure is arranged on the top of the end plate, which is raised from the top of the end plate by a first preset distance, and the upper surface of the protruding structure is provided with a first threaded hole for mounting a bolt assembly, thereby facilitating the fixation of the end plate or other components. By arranging the protruding structure and the bolt assembly hole on the top of the end plate, the end plate can be more firmly fixed on the reinforcing rib at the bottom by means of the bolt assembly, thereby improving the stability of the entire battery module. The bolt assembly hole on the protruding structure makes the installation process of the end plate more direct and simple, reducing the installation time and complexity. If the end plate needs to be replaced or repaired, the bolt assembly hole design on the protruding structure makes disassembly and reinstallation more convenient. The design of the first threaded hole allows different lengths and types of bolt assemblies to be selected as needed to adapt to different installation requirements.

[0009] In a possible design, the distance from the bottom to the top of the end plate is the height of the end plate, the height of the end plate is the same as the height of the battery module, and the first preset distance is 2-6 mm.

[0010] With the above scheme, the height of the end plate is the same as that of the battery module, which means that the end plate can completely cover both ends of the battery module, providing uniform support and protection. The first preset distance (the height of the protruding structure relative to the top of the end plate) is set between 2mm to 6mm, which provides certain flexibility for design to adapt to different installation requirements and manufacturing tolerances. The appropriate height of the protruding structure can ensure the smooth installation of the bolt assembly or other fasteners, while reducing errors in the installation process. The appropriate height of the protruding structure helps to disperse the stress between the end plate and the battery module, reduces potential stress concentration points, and improves the durability of the structure.

[0011] In a possible design, an electrical isolation plate is also included, which is parallel to the box bottom plate and is arranged above the battery module. The electrical isolation plate is provided with an arch structure corresponding to the position of the protruding structure, which can cover the bolt assembly on the protruding structure.

[0012] With the above scheme, the electrical isolation plate is parallel to the box bottom plate and is arranged above the battery module. Such design helps to achieve electrical isolation, avoiding direct current flow from one area to another, reducing mutual interference between different circuits. The electrical isolation plate is provided with an arch structure corresponding to the position of the protruding structure, which can cover the bolt assembly on the protruding structure. This design can provide additional protection to prevent the bolt assembly from being directly affected by external factors such as dust, moisture, etc., thereby improving the sealing and reliability of the battery pack. The use of arch structure and protruding structure enhances the structural stability of the end plate area, which is conducive to the bolt assembly to withstand the pressure generated by the cell stack and external impact force. The design of the electrical isolation plate and the arch structure helps to improve the safety of the battery pack by preventing electrical short circuit and physical damage, reducing the risk of battery pack failure.

[0013] In a possible design, a plurality of cross-connection assemblies are also included, and the protruding structure is located at the gap between two adjacent cross-connection assemblies.

[0014] With the above scheme, the use of cross-connection assemblies can optimize the electrical connection of the battery module, improve the uniformity of current distribution and the reliability of connection. The protruding structure is located at the gap between the cross-connection assemblies, which can reasonably utilize the space while ensuring the reliability of electrical connection. The design of the protruding structure can ensure that the electrical connection between the end plate and the cross-connection assembly is more stable.

[0015] In a possible design, the second threaded hole is provided on the reinforcing rib corresponding to the position of the protruding structure, and the bolt assembly passes through the end plate from the first threaded hole to the second threaded hole.

[0016] By the above scheme, by setting the second threaded hole on the reinforcing rib, the bolt assembly can be connected with the reinforcing rib through the end plate, which can enhance the structural stability of the whole battery module and improve the rigidity requirement of the battery module. The design of the bolt assembly passing through the first threaded hole and the second threaded hole simplifies the installation process, making the connection of the end plate and the reinforcing rib more quick and convenient, which helps to improve the assembly efficiency of the battery module. Since the bolt assembly is directly connected with the reinforcing rib, the additional cross beam or connecting piece is saved, thereby saving space, improving the space utilization of the battery pack box, and further improving the energy density of the battery pack.

[0017] In a possible design, the thickness of the end plate is 7mm-11mm, and the thickness of the end plate is the dimension of the end plate parallel to the first direction.

[0018] By the above scheme, the thickness of the end plate is in the range of 7mm to 11mm, which can provide sufficient rigidity and strength to support and protect the cell stack and prevent damage caused by external impact or pressure during transportation or use. Since the end plate is fixed on the reinforcing rib, and the bolt assembly is arranged on the protruding structure, the thickness of the end plate does not need to consider the installation of the bolt assembly, especially the thickness of the end plate does not need to consider the diameter of the flange in the bolt assembly. Therefore, the thickness of the end plate can be reduced to the range of 7mm to 11mm, thereby further providing space for the arrangement of the battery module, thereby improving the energy density of the battery pack.

[0019] In a possible design, the width of the reinforcing rib for fixing the end plate is 15mm-25mm, and the width of the reinforcing rib is the dimension of the reinforcing rib parallel to the first direction.

[0020] By the above scheme, the wider reinforcing rib can provide a larger heat conduction area, which helps to disperse the heat inside the battery module and improve the thermal management efficiency. The width of the reinforcing rib is between 15mm and 25mm, which can provide sufficient support force to enhance the structural stability of the battery module and prevent deformation caused by external force. At the same time, the width of the reinforcing rib is not less than 15mm, which can meet the installation of the bolt assembly, thereby better fixing the end plate on the reinforcing rib. The width of the reinforcing rib is not greater than 25mm, which can ensure that the internal materials are used more reasonably and reduce waste.

[0021] In a possible design, a cover plate and a side plate are further included, the side plate is arranged on the box bottom plate and located on both sides of the cell stack direction, and the cover plate can cover the box bottom plate.

[0022] By the above scheme, the addition of the side plate can provide additional support and enhance the structural stability of the entire battery module. The side plate can help limit the movement of the battery cell on the side and ensure that the battery cell maintains the correct position during transportation and use. The side plate can be part of the thermal management, and through appropriate material selection and design, it can help to disperse the heat inside the battery module. The cover plate, the box bottom plate and the side plate jointly enclose a cavity capable of accommodating the battery module.

[0023] In a second aspect, the present application provides a vehicle comprising the battery pack box of any one of the above.

[0024] The vehicle provided in the above second aspect and the possible designs of the above second aspect have the beneficial effects of the first aspect and the possible embodiments of the first aspect, which will not be repeated here.

[0025] The above description is only a summary of the technical solutions of the embodiments of the present application. In order to make the technical means of the embodiments of the present application more clear, the embodiments can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the embodiments of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0027] Figure 1 The exploded view of the battery pack box structure provided in an embodiment of the present application.

[0028] Figure 2 The partial structure schematic diagram of the battery pack box provided in an embodiment of the present application.

[0029] Figure 3 The end plate structure schematic diagram provided in an embodiment of the present application.

[0030] Figure 4 The schematic diagram of the electrical isolation plate in the battery pack box provided in an embodiment of the present application.

[0031] Figure 5 The partial structure top view of the battery pack box provided in an embodiment of the present application.

[0032] Figure 6 The Figure 7 Sectional view in AA1 direction.

[0033] Figure 7 is a front view of a battery pack case provided in an embodiment of the present application, showing from the top of a battery module.

[0034] Figure 8 is a front view of a battery pack case provided in an embodiment of the present application, showing from the top of a battery module. Figure 7 is a right view of the battery pack case.

[0035] Figure 9 is a front view of a battery pack case provided in an embodiment of the present application, showing from the top of a battery module.

[0036] Figure 10 is a front view of a battery pack case provided in an embodiment of the present application, showing from the top of a battery module. Figure 9 is a right view of the battery pack case.

[0037] Legend: 100, case bottom plate; 110, reinforcing rib; 101, cover plate; 120, side plate; 130, sealing ring; 140, coaming; 200, battery module; 210, battery cell; 220, end plate; 221, protruding structure; 230, electrical isolation plate; 231, arched structure; 240, cross-connection assembly; 300, bolt assembly; AA1, section line. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application; the terms “comprise” and “have” and any variations thereof in the specification and claims of the present application and the drawings description are intended to cover non-exclusive inclusion.

[0040] Reference herein to “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase “in an embodiment” in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive of other embodiments. It is explicitly and implicitly understood that the embodiments described herein are capable of combination.

[0041] The term “and / or” herein is merely used to describe associated objects, indicating that there can be three relationships, for example, A and / or B can mean that A exists, A and B exist, and B exists. In addition, the character “ / ” herein generally indicates that the front and rear associated objects are a “or” relationship.

[0042] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the battery pack box of the present application. For example, in the description of the present application, the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] In addition, the terms “first”, “second”, and the like in the specification and claims of the present application or the above drawings are used to distinguish different objects, and are not used to describe a particular order, and can explicitly or implicitly include one or more of the features.

[0044] In the description of the present application, unless otherwise specified, the meaning of “a plurality of” is two or more (including two), and similarly, “a plurality of groups” means two or more groups (including two groups).

[0045] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, the "connection" or "connecting" of mechanical structures can mean physical connection, for example, the physical connection can be fixed connection, for example, fixed connection by spacer, for example, fixed connection by screw, bolt assembly or other spacer; the physical connection can also be detachable connection, for example, mutual clamping or clamping connection; the physical connection can also be integrally connected, for example, welding, bonding or integrally formed connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The "connection" or "connecting" of the circuit structure can mean electrical connection or signal connection in addition to physical connection, for example, it can be direct connection, that is, physical connection, or indirect connection through at least one intermediate element, as long as the circuit is connected, it can also be the internal connection of two elements; signal connection can be signal connection through media medium in addition to electrical connection, for example, radio wave. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] As known from the background, the battery pack box in the prior art needs to meet the internal structure stability.

[0047] As can be analyzed, in order to make the internal structure of the battery pack more stable, the end plates are arranged at both ends of the battery module in the prior art, in order to protect the rigidity of the battery module, a cross beam is arranged in the battery pack box, and the end plates at both ends of each module are fixed on the cross beam according to the needs, so as to protect the stability of the battery module, thereby improving the stability of the battery pack. However, the installation of the cross beam occupies a large amount of space in the battery pack box, resulting in a decrease in the space utilization rate of the battery pack.

[0048] Therefore, the battery pack box and the vehicle provided in the embodiments of the present application correspondingly arrange reinforcing ribs in the cavity structure at the position of each end plate, which are used to fix the end plates and enhance the rigidity of the entire battery module. Since the reinforcing ribs are arranged inside the box bottom plate and the end plates are directly fixed on the reinforcing ribs, additional cross beams are not needed to install the end plates, thereby saving space. By saving space, more battery modules can be placed in the same volume, thereby improving the energy density of the battery pack.

[0049] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings.

[0050] Figure 1 The explosion view of the battery pack box structure provided in the present embodiment is shown. Figure 2A partial structure schematic diagram of a battery pack case provided in an embodiment of the present application. Figure 5 A top view of a partial structure in a battery pack case provided in an embodiment of the present application. Figure 6 A partial structure schematic diagram of a battery pack case provided in an embodiment of the present application. Figure 7 A cross-sectional view in the direction of section line AA1. Please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 The battery pack case in the embodiment includes a plurality of battery modules 200 and a case bottom plate 100.

[0051] The battery module 200 includes a plurality of stacked single cell batteries 210 and an end plate 220, wherein the cell batteries 210 are arranged in a single column, and the end plate 220 is arranged at both ends in a first direction, which is the stacking direction of the cell batteries 210.

[0052] It can be understood that the end plate 220 is arranged at both ends of each single battery module 200, and one end plate 220 can be arranged between two adjacent groups of battery modules 200 in the first direction.

[0053] As shown in Figure 6 , the plurality of battery modules 200 are arranged on the case bottom plate 100, and the case bottom plate 100 is a hollow structure. A reinforcing rib 110 is arranged in the hollow structure at the position corresponding to each end plate 220, and the end plate 220 is fixed on the reinforcing rib 110.

[0054] It can be understood that the reinforcing rib 110 is arranged at the position corresponding to the end plate 220 that needs to be fixed, and can also be arranged at other required positions to meet the heat dissipation requirement of the battery module 200.

[0055] By the above scheme, since the end plate 220 is arranged at both ends of each battery module 200 and fixed on the corresponding reinforcing rib 110, the rigidity requirement of the battery module 200 is met, and the box bottom plate 100 is designed as a hollow structure, allowing the internal structure to be increased without increasing the external volume. The reinforcing rib 110 is arranged in the hollow structure at the position of each end plate 220, and is used to fix the end plate 220 and enhance the rigidity of the entire battery module 200. Since the reinforcing rib 110 is arranged inside the box bottom plate 100, and the end plate 220 is directly fixed on the reinforcing rib 110, no additional cross beam is needed to install the end plate 220, thereby saving space. By saving space, more battery modules 200 can be placed in the same volume, thereby improving the energy density of the battery pack. The fixing mode of the end plate 220 provides better structural stability, which is crucial for the battery pack to maintain performance when subjected to impact or vibration. Since the reinforcing rib 110 is arranged inside the box bottom plate 100, and the end plate 220 is fixed on the reinforcing rib 110, no additional cross beam is needed to install the end plate 220, thereby saving space and improving the space utilization of the battery pack box.

[0056] Please continue to refer to Figure 1 The battery pack box further includes a cover plate 101 and a side plate 120, the side plate 120 is arranged on the box bottom plate 100 and located on both sides of the stacking direction of the battery cell 210, and the cover plate 101 can be covered on the box bottom plate 100.

[0057] In this embodiment, a sealing ring 130 is arranged between the cover plate 101 and the box bottom plate 100 to ensure the sealing of the battery pack box.

[0058] In this embodiment, a surrounding plate 140 can also be arranged at both ends of the box bottom plate 100, and the surrounding plate 140 is used to install electrical components.

[0059] The cover plate 101 can be fitted on the box bottom plate 100, together with the side plate 120 to form a seal, which helps to keep the inside of the battery pack clean and dry, and also can prevent the leakage of gas inside the battery pack. The side plate 120 and the cover plate 101 can be designed with cooling channels to cooperate with the thermal management system of the battery pack, improving the heat dissipation efficiency. The addition of the side plate 120 can provide additional support, enhancing the structural stability of the entire battery module 200. The side plate 120 can help limit the movement of the battery cell 210 on the side, ensuring that the battery cell 210 maintains the correct position during transportation and use. The side plate 120 can be part of the thermal management, through appropriate material selection and design, can help to disperse the heat inside the battery module 200. The cover plate 101, the box bottom plate 100 and the side plate 120 together form a cavity that can accommodate the battery module 200. The side plate 120 and the cover plate 101 can integrate additional functions, such as cable outlets, sensor interfaces, heat dissipation holes, etc. Through the cover plate 101 and the side plate 120, the protection performance, structural integrity, sealing performance and thermal management efficiency of the battery pack box are improved, while maintaining electrical safety and ease of maintenance, to ensure the performance and reliability of the battery pack.

[0060] Figure 3 The end plate 220 structure schematic diagram provided in the present embodiment is shown in FIG. 11. Please refer to FIG. 11 Figure 3 In the present embodiment, the end plate 220 has a bottom in contact with the box bottom plate 100 and a top away from the box bottom plate 100, and a protruding structure 221 is provided on the top, the protruding structure 221 is raised from the top of the end plate 220 by a first predetermined distance, and the upper surface of the protruding structure 221 has a first threaded hole, which can be used to install the bolt assembly 300.

[0061] Through the above scheme, the protruding structure 221 is provided on the top of the end plate 220, which is raised from the top of the end plate 220 by a first predetermined distance, and the upper surface of the protruding structure 221 is provided with a first threaded hole, which is used to install the bolt assembly 300, so as to facilitate the fixation of the end plate 220 or other components. By providing the protruding structure 221 on the top of the end plate 220 and the bolt assembly 300 hole, the end plate 220 can be more firmly fixed on the bottom reinforcing rib 110 through the bolt assembly 300, thereby improving the stability of the entire battery module 200. The bolt assembly 300 hole on the protruding structure 221 makes the installation process of the end plate 220 more direct and simple, reducing the installation time and complexity. If the end plate 220 needs to be replaced or repaired, the bolt assembly 300 hole on the protruding structure 221 makes it more convenient to disassemble and reassemble. The design of the first threaded hole allows the selection of different lengths and types of bolt assemblies 300 according to needs to adapt to different installation requirements.

[0062] In the embodiment, the second threaded hole is arranged on the reinforcing rib 110 corresponding to the protruding structure 221, and the bolt assembly 300 passes through the end plate 220 from the first threaded hole to the second threaded hole.

[0063] Through the above scheme, by arranging the second threaded hole on the reinforcing rib 110, the bolt assembly 300 can be connected with the reinforcing rib 110 through the end plate 220, which can enhance the structural stability of the entire battery module 200 and improve the rigidity requirement of the battery module 200. The design of the bolt assembly 300 passing through the first threaded hole and the second threaded hole simplifies the installation process, making the connection of the end plate 220 and the reinforcing rib 110 more quick and convenient, which helps to improve the assembly efficiency of the battery module 200. Since the bolt assembly 300 is directly connected with the reinforcing rib 110, the additional cross beam or connecting piece is saved, thereby saving space, improving the space utilization rate of the battery pack box, and further improving the energy density of the battery pack.

[0064] In the embodiment, the width of the reinforcing rib 110 for fixing the end plate 220 is 15mm-25mm, and the width of the reinforcing rib 110 is the dimension of the reinforcing rib 110 parallel to the first direction.

[0065] Through the above scheme, the wider reinforcing rib 110 can provide a larger heat conduction area, which helps to disperse the heat inside the battery module 200 and improve the heat management efficiency. The width of the reinforcing rib 110 is between 15mm and 25mm, which can provide sufficient support force to enhance the structural stability of the battery module 200 and prevent deformation caused by external force. At the same time, the width of the reinforcing rib 110 is not less than 15mm, which can meet the installation of the bolt assembly 300, thereby better fixing the end plate 220 on the reinforcing rib 110. The width of the reinforcing rib 110 is not greater than 25mm, which can ensure that the internal materials are used more reasonably and reduce waste.

[0066] In the embodiment, the distance from the bottom to the top of the end plate 220 is the height of the end plate 220, and the height of the end plate 220 is the same as the height of the single battery cell 210. The first preset distance is 2mm-6mm.

[0067] In this embodiment, the bolt assembly 300 used is an M6 bolt flange, which includes a bolt body, a flange, and a tail. The bolt body is the main part of the bolt, shaped like a hexagon, and is used to cooperate with a wrench or tool to tighten or loosen the bolt. The flange is located on one side of the bolt head and is a flat surface that is used to contact the surface of the raised structure 221 to disperse the fastening force and prevent damage to the surface of the raised structure 221. The bolt body can have a helical groove that can engage with the second threaded hole of the reinforcing rib 110 or the end plate 220 to achieve fastening. The tail is the end of the bolt, which can have different forms according to different standards, such as full-thread type or half-thread type. In this embodiment, the end plate 220 is fixed on the reinforcing rib 110 by inserting the bolt assembly 300 from the first threaded hole of the raised structure 221 through the end plate 220 to the second threaded hole on the reinforcing rib 110.

[0068] In this embodiment, the M6 bolt flange can be made of different materials, such as steel, stainless steel, etc., to adapt to different application environments and corrosion resistance requirements.

[0069] In this embodiment, the surface of the bolt can be treated in different ways, such as tin plating, magnetite protective film (blackening treatment), chromate gloss treatment, bright zinc plating, chromium plating, nickel plating, etc., to improve corrosion resistance and aesthetics.

[0070] Through the above scheme, the height of the end plate 220 is the same as the height of the battery cell 210, which means that the end plate 220 can completely cover both ends of the battery module 200, providing uniform support and protection. The first predetermined distance (the height of the raised structure 221 relative to the top of the end plate 220) is set between 2mm and 6mm, which provides certain flexibility for design to adapt to different installation requirements and manufacturing tolerances. The appropriate height of the raised structure 221 can ensure the smooth installation of the bolt assembly 300 or other fasteners, while reducing errors during installation. The appropriate height of the raised structure 221 helps to disperse the stress between the end plate 220 and the battery module 200, reduces potential stress concentration points, and improves the durability of the structure.

[0071] Figure 4 A schematic view of the electrical isolation plate 230 provided in the battery pack case of this embodiment is shown. Please refer to Figure 4 In this embodiment, the electrical isolation plate 230 is also included, which is parallel to the case bottom plate 100 and is arranged above the battery module 200. The electrical isolation plate 230 is provided with an arch structure 231 corresponding to the position of the raised structure 221, and the arch structure 231 can cover the bolt assembly 300 on the raised structure 221.

[0072] By the above scheme, the electrical isolation plate 230 is parallel to the box bottom plate 100 and is arranged above the battery module 200. Such design helps to achieve electrical isolation, avoid direct current flow from one area to another area, and reduce mutual interference between different circuits. The electrical isolation plate 230 is provided with an arch structure 231 corresponding to the position of the protruding structure 221. The arch structure 231 can cover the bolt assembly 300 on the protruding structure 221. This design can provide additional protection to prevent the bolt assembly 300 from being directly affected by external factors (such as dust, moisture, etc.), thereby improving the sealing and reliability of the battery pack. The cooperation of the arch structure 231 and the protruding structure 221 enhances the structural stability of the end plate 220 area, which is conducive to the bolt assembly 300 to withstand the pressure generated by the cell 210 stack and external impact force. The design of the electrical isolation plate 230 and the arch structure 231 helps to improve the safety of the battery pack by preventing electrical short circuit and physical damage, reducing the risk of battery pack failure.

[0073] Figure 7 is a front view of the battery pack box provided in the embodiment, showing from the top of the battery module 200. Figure 8 is a front view of the battery pack box provided in the embodiment, showing from the top of the battery module 200. Figure 7 is a front view of the battery pack box provided in the embodiment, showing from the top of the battery module 200. Figure 9 is a front view of the battery pack box provided in the embodiment, showing from the top of the battery module 200. Figure 10 is a front view of the battery pack box provided in the embodiment, showing from the top of the battery module 200. Figure 9 is a front view of the battery pack box provided in the embodiment, showing from the top of the battery module 200. Figures 7 to 10 In the embodiment, the battery pack box structure further includes a plurality of jumper assemblies 240, and the protruding structure 221 is located at the gap between two adjacent jumper assemblies 240.

[0074] Comparing Figure 7 and Figure 9 , it can be seen that Figure 1 is a schematic view of the bolt assembly 300 fixed on the protruding structure 221 without showing the electrical isolation plate 230, corresponding to Figure 9 shows the position of the jumper assembly 240. It can be seen that the protruding structure 221 is arranged at the position without the jumper assembly 240, so as not to affect the structure inside the battery pack.

[0075] The jumper assembly 240 in the embodiment is an aluminum bar. The jumper aluminum bar can reduce the weight of the battery pack, which is conducive to the lightweight design of the battery pack.

[0076] In some embodiments, the jumper aluminum bar can be a copper bar.

[0077] By the above scheme, the use of the cross-connection assembly 240 can optimize the electrical connection of the battery module 200, improve the uniformity of current distribution and the reliability of the connection. The protruding structure 221 is located at the gap of the cross-connection assembly 240, and such a layout can reasonably utilize the space while ensuring the reliability of the electrical connection. The design of the protruding structure 221 can ensure that the electrical connection between the end plate 220 and the cross-connection assembly 240 is more stable.

[0078] In the embodiment, the thickness of the end plate 220 is 7mm-11mm, and the thickness of the end plate 220 is the dimension of the end plate 220 parallel to the first direction.

[0079] The thickness of the end plate 220 in the embodiment is 9mm, which ensures the rigidity requirement of the battery module 200 while saving internal space.

[0080] The thickness of the end plate 220 in some embodiments is 10mm, which ensures the rigidity requirement of the battery module 200 while saving internal space.

[0081] By the above scheme, the thickness of the end plate 220 is in the range of 7mm to 11mm, which can provide sufficient rigidity and strength to support and protect the stack of battery cells 210, prevent damage caused by external impact or pressure during transportation or use. Since the end plate 220 is fixed on the reinforcing rib 110, and the bolt assembly 300 is arranged on the protruding structure 221, the thickness of the end plate 220 does not need to consider the installation of the bolt assembly 300, especially the thickness of the end plate 220 does not need to consider the diameter of the flange plate in the bolt assembly 300, therefore, the thickness of the end plate 220 can be reduced to the range of 7mm to 11mm, thereby further providing space for the arrangement of the battery module 200, thereby improving the energy density of the battery pack.

[0082] Based on the above embodiments, the embodiment also provides a vehicle comprising the battery pack case of any one of the above. Since the structure and advantages of the battery pack case have been described in detail in the previous embodiments, the present application will not be repeated here.

[0083] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and such modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack case characterized by comprising: The battery pack box comprises: a plurality of battery modules, each of which comprises a plurality of stacked single cells and an end plate, wherein the single cells are arranged in a single column, and the end plate is arranged at both ends in a first direction, which is the stacking direction of the single cells; a box bottom plate, on which the plurality of battery modules are arranged, the box bottom plate being a hollow structure, and a reinforcing rib is arranged in the hollow structure at the position of each end plate, and the end plate is fixed on the reinforcing rib.

2. The battery pack enclosure of claim 1, wherein, The end plate has a bottom part in contact with the box bottom plate and a top part away from the box bottom plate, and a protruding structure is arranged on the top part, the protruding structure being higher than the top part of the end plate by a first preset distance, and the upper surface of the protruding structure has a first threaded hole, which can be used to install a bolt assembly.

3. The battery pack enclosure of claim 2, wherein, The distance from the bottom part to the top part of the end plate is the height of the end plate, which is the same as the height of the battery module, and the first preset distance is 2-6 mm.

4. The battery pack enclosure of claim 2, wherein, The battery pack box further comprises an electrical isolation plate, which is parallel to the box bottom plate and arranged above the battery modules, and an arch structure is arranged on the electrical isolation plate at the position of the protruding structure, which can cover the bolt assembly on the protruding structure.

5. The battery pack enclosure of claim 4, wherein, The battery pack box further comprises a plurality of cross-connection assemblies, and the protruding structure is located at the gap between two adjacent cross-connection assemblies.

6. The battery pack enclosure of claim 2, wherein, A second threaded hole is arranged on the reinforcing rib at the position of the protruding structure, and the bolt assembly passes through the end plate from the first threaded hole to the second threaded hole.

7. The battery pack enclosure of claim 2, wherein, The thickness of the end plate is 7-11 mm, which is the dimension of the end plate in parallel to the first direction.

8. The battery pack enclosure of claim 1, wherein, The width of the reinforcing rib for fixing the end plate is 15-25 mm, which is the dimension of the reinforcing rib in parallel to the first direction.

9. The battery pack enclosure of claim 1, wherein, The battery pack box further comprises a cover plate and side plates, the side plates are arranged on the box bottom plate and located at both sides in the stacking direction of the single cells, and the cover plate covers the box bottom plate.

10. A vehicle characterized by comprising: The battery pack box comprises the battery pack box according to any one of claims 1-9. The battery pack box comprises the battery pack box according to any one of claims 1-9.

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