Battery pack box structure and battery pack

Abstract

The utility model provides a battery pack box body structure and a battery pack, and belongs to the field of battery manufacturing, the battery pack box body structure comprises a lower box body and a sealing gasket, the lower box body comprises a bottom plate, vertical plates are arranged on the two sides of the bottom plate, the vertical plates are parallel to the length direction of the bottom plate, and positioning rails are formed on the side edges of the vertical plates and the bottom plate; the width of the positioning track is the linear distance between the vertical plate and the side edge of the bottom plate, the width of the positioning track is smaller than the first thickness of the sealing gasket, and the first thickness is the thickness size of the sealing gasket in the direction parallel to the plane of the bottom plate in a natural state; the sealing gasket surrounds the lower box body by one circle and is located on the positioning track. The width of the positioning track is designed to be smaller than the thickness of the sealing gasket, it is ensured that the sealing gasket can be effectively compressed between the upper cover plate and the vertical plate when the upper cover plate is buckled, the sealing performance of the sealing gasket can be improved through compression, and moisture and dust are prevented from invading. The width design of the positioning track can well control the shrinkage amount of the sealing gasket, and the space of the battery pack is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery manufacturing, in particular to a battery pack box structure and a battery pack. BACKGROUND

[0002] With the aggravation of global oil energy shortage and environmental pollution hazards, energy saving and emission reduction will inevitably become the main direction of future automobile development, and developing electric vehicles will be the best way to solve these two technical difficulties. The growing market for electric vehicles has driven up demand for related parts. The core component of electric vehicles is the power battery pack, and the power battery pack cover is an important part of the power battery, which plays a very important protective role for the battery module. With the increasing demand for endurance mileage of commercial heavy truck vehicles, the power battery pack needs to meet higher energy demands, therefore, the size of the power battery pack will be larger, and while pursuing higher energy density, the sealing performance of the battery pack is also a major problem.

[0003] Therefore, it is urgent to provide a battery pack box structure and a battery pack that can meet the higher energy density of the battery pack while ensuring the sealing performance. CONTENT OF THE INVENTION

[0004] The present application provides a battery pack box structure and a battery pack to improve the energy density of the battery pack while ensuring the sealing performance.

[0005] In a first aspect, the present application provides a battery pack box structure, comprising: a lower box body and a sealing gasket; the lower box body comprises a bottom plate, both sides of the bottom plate have a vertical plate, the vertical plate is arranged in parallel with the length direction of the bottom plate, the vertical plate and the side edge of the bottom plate form a positioning track, the width of the positioning track is the straight line distance from the vertical plate to the side edge of the bottom plate, the width of the positioning track is less than the first thickness of the sealing gasket, the first thickness is the thickness dimension of the sealing gasket in the direction parallel to the bottom plate plane in the natural state; the sealing gasket surrounds the lower box body for one turn and is located on the positioning track.

[0006] By the above scheme, the vertical plate is arranged along the length direction of the bottom plate, and forms a positioning track with the side edge of the bottom plate. This design can improve the structural strength of the box body, and provide a stable placement position for the sealing gasket. Moreover, the design of the vertical plate can block the overflow of the structural adhesive when the structural adhesive is applied inside the lower box body. The width of the positioning track is designed to be less than the thickness of the sealing gasket, so as to ensure that the sealing gasket can be effectively compressed between the upper cover plate and the vertical plate when the upper cover plate is buckled, which can improve the sealing performance of the sealing gasket and prevent the intrusion of moisture and dust. The width of the positioning track can well control the shrinkage of the sealing gasket, and ensure the flexibility of the design. When the upper cover plate is buckled on the lower box body, the side edge of the upper cover plate is fixed with the bottom plate in a direction perpendicular to the vertical edge, which does not increase the volume of the battery pack, and helps to maintain the energy density of the battery pack. When buckling, the volume of the battery pack is not increased, which can ensure that the sealing gasket is uniformly compressed and improve the sealing effect.

[0007] In a possible design, the upper cover plate is further included, the upper cover plate has a top plate and a side plate, the top plate and the side plate are connected with each other perpendicularly to form a cavity, and the upper cover plate can be buckled on the lower box body, and the top plate and the side plate of the upper cover plate compress and fix the sealing gasket on the lower box body.

[0008] By the above scheme, the cavity formed by the perpendicular connection of the top plate and the side plate of the upper cover plate ensures the firmness of the upper cover plate, and the top plate and the side plate of the upper cover plate compress the sealing gasket on the lower box body to form a tight seal, preventing the intrusion of moisture, dust and other pollutants, and protecting the battery cells and other components inside the battery pack.

[0009] In a possible design, the lower box body further includes a surrounding plate arranged at both ends of the bottom plate, the surrounding plate is arranged perpendicularly to the vertical plate, and the sealing gasket is arranged on the positioning track and the edge of the surrounding plate.

[0010] By the above scheme, the surrounding plate is arranged at both ends of the bottom plate, and the surrounding plate is perpendicular to the vertical plate. The surrounding plate can be used to arrange electrical connection devices. At the same time, this design can enhance the overall rigidity and structural stability of the lower box body, especially when subjected to external impact or pressure. The sealing gasket is not only arranged on the positioning track, but also arranged along the edge of the surrounding plate. Since the sealing gasket covers the positioning track and the edge of the surrounding plate, this design can provide more comprehensive sealing effect. When the upper cover plate is buckled, the sealing gasket is compressed in multiple directions, thereby improving the reliability of the sealing.

[0011] In a possible design, the distance between the two ends of the surrounding plate and the side edge of the bottom plate is less than or equal to the width of the positioning track.

[0012] By the above scheme, the two ends of the surrounding plate are designed closer to the side edges of the bottom plate, so that the width of the surrounding plate matches or is slightly smaller than that of the positioning track, and the sealing gasket can be smoother when it transitions from the positioning track to the edge of the surrounding plate, avoiding the generation of gaps during the transition process. Such a design can ensure that the sealing gasket is uniformly compressed between the positioning track and the surrounding plate, thereby improving the sealing effect. By precisely controlling the distance between the surrounding plate and the side edges of the bottom plate, the space can be utilized to the maximum extent while maintaining the compact size of the battery pack, which helps to improve the energy density of the battery pack.

[0013] In one possible design, the width of the positioning track is less than or equal to one-half of the first thickness.

[0014] By the above scheme, the width of the positioning track can control the compression of the sealing gasket, so when the width of the positioning track is less than or equal to one-half of the first thickness, it means that the sealing gasket will be significantly compressed on the positioning track. This compression can better improve the sealing performance of the sealing gasket and prevent the intrusion of moisture, dust and other contaminants.

[0015] In one possible design, the end of the vertical plate abuts against the surrounding plate.

[0016] By the above scheme, the abutment of the end of the vertical plate against the surrounding plate can enhance the structural stability of the entire lower box. This structural design helps to disperse and withstand external impact forces, protecting the battery cells and other components inside the battery pack. The connection of the vertical plate and the surrounding plate can simplify the assembly process. This design can make the assembly line more efficient, as the connection of the vertical plate and the surrounding plate provides a stable platform for the alignment and fastening of the upper cover plate. The design of the end of the vertical plate abutting against the surrounding plate can ensure the correct position of the sealing gasket on the positioning track, which helps to ensure that the sealing gasket is uniformly compressed when the upper cover plate is fastened, thereby improving the sealing performance.

[0017] In one possible design, the edge of the bottom plate is provided with a plurality of first positioning structures, and the sealing gasket is provided with a plurality of second positioning structures corresponding to the first positioning structures, and the second positioning structures are connected with the first positioning structures to enable the sealing gasket to be installed on the bottom plate; the first positioning structure and / or the second positioning structure is a groove and / or a protrusion.

[0018] By the above scheme, the first positioning structure can be designed as a protrusion or a groove, arranged at the edge of the bottom plate, for matching with the second positioning structure on the sealing gasket. This design can ensure the correct position and fixation of the sealing gasket on the bottom plate. The second positioning structure can be designed as a protrusion or a groove matching the shape of the first positioning structure, arranged on the sealing gasket. When the sealing gasket is installed on the bottom plate, these structures are embedded with each other, ensuring that the sealing gasket cannot move or misalign on the bottom plate. Through the precise positioning structure matching, the sealing effect of the sealing gasket can be improved, preventing the intrusion of moisture, dust and other contaminants, thereby protecting the battery cells and other components inside the battery pack. The design of the positioning structure should facilitate disassembly and replacement to reduce maintenance time and cost.

[0019] In a possible design, the distance between two adjacent first positioning structures is 2mm-6mm.

[0020] By the above scheme, the distance between the first positioning structures is set in the range of 2mm-6mm, which can ensure the uniform distribution of the sealing gasket on the bottom plate and provide a continuous sealing effect. When the distance between the first positioning structures is less than 2mm, the first positioning structures are too close, reducing the installation efficiency, and when the distance between the first positioning structures is greater than 6mm, the sealing gasket may slip and be at risk, therefore the distance in the range of 2mm-6mm can prevent the sealing gasket from being twisted or misaligned during installation.

[0021] In a possible design, the height of the stand plate is greater than the second thickness of the sealing gasket, and the second thickness is the thickness dimension of the sealing gasket in the direction perpendicular to the bottom plate in the natural state.

[0022] By the above scheme, the increased height of the stand plate can provide additional structural support, enhancing the lateral strength and impact resistance of the box body. This is crucial for protecting the battery cells and electronic components inside the battery pack, and can also better block the overflow of structural adhesive when the adhesive is applied inside the lower box. When the upper cover plate is buckled, the sealing gasket will be compressed between the stand plate and the upper cover plate, and the height of the sealing gasket may increase in the height direction, therefore the height of the stand plate greater than the second thickness of the sealing gasket can better ensure the tightness.

[0023] In a second aspect, the application provides a battery pack, comprising a battery module and a battery pack box structure.

[0024] The battery pack provided in the above second aspect and each possible design of the above second aspect has the beneficial effects as described in the above first aspect and each possible embodiment 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 clearly understood, and to 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 embodiment description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0027] Figure 1 A schematic diagram of the battery pack box structure provided in an embodiment of the present application.

[0028] Figure 2 A schematic diagram of the lower box structure from one perspective provided in an embodiment of the present application.

[0029] Figure 3 A schematic diagram of the lower box structure from another perspective provided in an embodiment of the present application. Figure 2 An enlarged schematic diagram of region A in the middle.

[0030] Figure 4 An enlarged schematic diagram of region B in the middle. Figure 2 An enlarged schematic diagram of region B in the middle.

[0031] Figure 5 A schematic diagram of the lower box structure from another perspective provided in an embodiment of the present application.

[0032] Figure 6 An enlarged schematic diagram of region C in the middle. Figure 5 An enlarged schematic diagram of region C in the middle.

[0033] Figure 7 A schematic diagram of the battery pack structure provided in an embodiment of the present application.

[0034] Legend: 100, lower box; 110, bottom plate; 130, vertical plate; 120, surrounding plate; 131, first positioning structure; 140, positioning track; 200, sealing gasket; 201, second positioning structure; 300, upper cover plate; 301, top plate; 302, side plate; 400, bolt hole; 410, rivet hole; 420, screw; 500, battery module; A, region; B, region; C, region; L1, first straight line; L2, second straight line. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort should fall into the scope of the present application.

[0036] 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 this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the use of the terms "including," "comprising," "having" and "with" and variations thereof in the specification and claims herein is intended to be open, and mean that there are equivalents.

[0037] 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 application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. A person of ordinary skill in the art will understand that an embodiment described herein can be combined with another embodiment.

[0038] The term "and / or", merely describes an associated relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A, A and B, and B. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0039] 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 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", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to 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.

[0040] In addition, the terms "first", "second", etc. 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 specific order, and can explicitly or implicitly include one or more of the features.

[0041] In the description of the present application, the meaning of "a plurality of" is two or more (including two), and the meaning of "a plurality of groups" is two or more groups (including two groups).

[0042] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense. For example, the "connection" or "connection" of mechanical structure can mean physical connection, such as fixed connection, for example, fixed connection by spacer, such as fixed connection by screw, bolt or other spacer; the physical connection can also be detachable connection, such as mutual clamping or clamping connection; the physical connection can also be integrally connected, such as 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.

[0043] Energy density is a major performance parameter of power battery, which refers to the energy that the battery can store in unit mass or unit volume, and directly affects the endurance mileage of the vehicle. At the same time, the sealing of the battery box is crucial for the performance, safety and life of the battery system, especially the prevention of moisture intrusion, dust prevention and the stability of internal pressure. Moisture is the enemy of battery system, which can cause short circuit of battery cell, corrosion of battery connecting piece and shell, and even cause battery swelling and thermal runaway. Good sealing can prevent moisture intrusion and protect the battery system. Dust prevention can prevent dust accumulation on battery components and avoid the influence of dust on heat exchange efficiency and electrical connection reliability. Gases may be generated during the charging and discharging process of the battery, and good sealing can prevent the accumulation of gases to avoid the rupture or deformation of the battery box. Chemical substances in the environment may corrode the materials of the battery box, and sealing can prevent the intrusion of these substances to prolong the service life of the box. The sealing of the battery box is an important part of the design of the battery system, which plays a key role in ensuring the reliability, safety and environmental adaptability of the battery system.

[0044] The embodiment of the present application provides a battery pack box structure and a battery pack, which comprise a lower box and a sealing gasket, the lower box comprises a bottom plate, the two sides of the bottom plate are provided with vertical plates, the vertical plates are arranged in parallel with the length direction of the bottom plate, the side edges of the vertical plates and the bottom plate form a positioning track, the sealing gasket is arranged on the positioning track, and the width of the positioning track is designed to well control the shrinkage of the sealing gasket, so that the flexibility of the design is guaranteed. The control manner of the shrinkage makes the side plates and the vertical plates of the upper cover plate be capable of forming cooperation, the side edges of the upper cover plate are fixed to the bottom plate in a direction perpendicular to the vertical edges after the upper cover plate is buckled on the lower box, the design does not increase the volume of the battery pack, and the energy density of the battery pack is helped to be maintained. When buckling, the weight and the pressure of the upper cover plate are transmitted to the bottom plate through the vertical plates, the sealing gasket is uniformly pressed, and the sealing effect is improved.

[0045] In order to enable the personnel in the technical field to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings.

[0046] Figure 1 The battery pack box structure provided in the embodiment is shown in the schematic view. Figure 2 The structure of the lower box 100 is shown in the schematic view of one perspective. Figure 3 The structure of the lower box 100 is shown in the schematic view of one perspective. Figure 2 The enlarged schematic view of the A area. Please refer to Figure 1 , Figure 2 and Figure 3 The battery pack box structure in the embodiment comprises a lower box 100 and a sealing gasket 200.

[0047] The lower box 100 comprises a bottom plate 110, the two sides of the bottom plate 110 are provided with vertical plates 130, the vertical plates 130 are arranged in parallel with the length direction of the bottom plate 110, the side edges of the vertical plates 130 and the bottom plate 110 form a positioning track 140, the width of the positioning track 140 is the straight-line distance of the vertical plates 130 from the side edges of the bottom plate 110, the width of the positioning track 140 is less than the first thickness of the sealing gasket 200, and the first thickness is the thickness dimension of the sealing gasket 200 in the direction parallel to the plane of the bottom plate 110 in a natural state.

[0048] The bottom plate 110 can adopt a high-strength lightweight material, such as an aluminum alloy, so that the structural strength of the battery box is improved while the weight is reduced.

[0049] The sealing gasket 200 surrounds the lower box 100 once and is located on the positioning track 140. The material of the sealing gasket 200 can be selected from ethylene propylene diene rubber (EPDM), which has good elasticity and resistance to water, oil and other media. The sealing gasket 200 in a natural state can be understood as a state in which the sealing gasket 200 does not produce any deformation due to external force.

[0050] It can be understood that the sealing gasket 200 can be designed to have an optimal cross-sectional shape determined by simulation analysis to achieve a placement shape that best matches the positioning track 140.

[0051] By the above scheme, the standing plate 130 is arranged along the length direction of the bottom plate 110 to form the positioning track 140 with the side edge of the bottom plate 110. This design can improve the structural strength of the box body and provide a stable placement position for the sealing gasket 200. In addition, the design of the standing plate 130 can block the overflow of structural adhesive when the structural adhesive is applied inside the lower box body 100. The width of the positioning track 140 is designed to be less than the thickness of the sealing gasket 200, which ensures that the sealing gasket 200 can be effectively compressed between the upper cover plate 300 and the standing plate 130 when the upper cover plate 300 is buckled. This compression can improve the sealing performance of the sealing gasket 200 and prevent the intrusion of moisture and dust. The width of the positioning track 140 can well control the shrinkage of the sealing gasket 200, ensuring the flexibility of the design. When the upper cover plate 300 is buckled on the lower box body 100, the side edge of the upper cover plate 300 is fixed to the bottom plate 110 in a direction perpendicular to the standing edge. This design does not increase the volume of the battery pack and helps to maintain the energy density of the battery pack. When buckled, the weight and pressure of the upper cover plate 300 are transmitted to the bottom plate 110 through the standing plate 130, ensuring that the sealing gasket 200 is uniformly compressed and improving the sealing effect.

[0052] The width of the positioning track 140 is less than or equal to one half of the first thickness.

[0053] For example, in the present embodiment, the width of the positioning track 140 is set to 2.5 mm. The thickness of the sealing gasket 200 in the first direction is 5 mm in a natural state.

[0054] The width of the positioning track 140 can control the shrinkage of the sealing gasket 200, so when the width of the positioning track 140 is less than or equal to one half of the first thickness, it means that the sealing gasket 200 will be significantly compressed on the positioning track 140. This compression can better improve the sealing performance of the sealing gasket 200 and prevent the intrusion of moisture, dust and other contaminants.

[0055] In the present embodiment, the thickness of the standing plate 130 is 3 mm. The thickness of the standing plate 130 refers to the dimension of the standing plate 130 in the same direction as the first thickness.

[0056] The height of the standing plate 130 is greater than the second thickness of the sealing gasket 200, and the second thickness is the thickness dimension of the sealing gasket 200 in the direction perpendicular to the bottom plate 110 in a natural state.

[0057] The height increase of the stand plate 130 can provide additional structural support, enhancing the lateral strength and impact resistance of the battery pack. This is crucial for protecting the cells and electronic components inside the battery pack, and can also better block the overflow of structural adhesive applied inside the lower case 100. When the upper cover plate 300 is fastened, the gasket 200 will be compressed between the stand plate 130 and the upper cover plate 300, which may increase in size in the height direction. Therefore, the height of the stand plate 130 should be greater than the second thickness of the gasket 200 to ensure a tight fit.

[0058] Please refer to Figure 1 The battery pack case structure also includes an upper cover plate 300, which has a top plate 301 and a side plate 302. The top plate 301 and the side plate 302 are connected perpendicularly to each other to form a cavity, which can be fitted on the lower case 100. The side plate 302 and the stand plate 130 compress the gasket 200 in the positioning track 140.

[0059] As shown in Figure 2 The bottom edge of the bottom plate 110 is provided with a plurality of bolt holes 400, and the edge of the side plate 302 is also provided with bolt holes. When the upper cover plate 300 and the lower case 100 are fastened, the edge of the side plate 302 and the edge of the bottom plate 110 can be screwed through the bolt holes. It can be seen that the direction of the screw 420 is perpendicular to the side plate 302, which does not increase the width of the battery case and saves the overall volume, ensuring the energy density.

[0060] It can be understood that when the upper cover plate 300 is fastened, the top plate 301 and the side plate 302 together compress and fix the gasket 200 on the lower case 100.

[0061] Through the above scheme, the cavity formed by the perpendicular connection of the top plate 301 and the side plate 302 of the upper cover plate 300 ensures the firmness of the upper cover plate 300. At the same time, the two ends of the upper cover plate 300 are not hindered, so that when installed, the side plate 302 can be pried in the opposite direction along the central axis of the top plate 301, thereby installing the upper cover plate on the lower case. At the same time, the side plate 302 and the stand plate 130 are opposite, which can compress the gasket 200 on the positioning track 140, and the top plate 301 and the side plate 302 of the upper cover plate 300 compress the gasket 200 on the lower case 100, forming a tight seal to prevent the intrusion of moisture, dust and other contaminants, and protecting the cells and other components inside the battery pack.

[0062] It can be understood that the design of the upper cover plate 300 should consider the cooperation with the stand plate 130 and the gasket 200. The design of the side plate should ensure that the inner side of the stand plate 130 can be tightly fitted to ensure that the gasket 200 can be uniformly compressed when fastened.

[0063] Figure 4 For Figure 2 enlarged view of the B region. Figure 5 For another perspective view of the lower box 100 structure provided in this embodiment. Figure 6 For Figure 5 enlarged view of the C region. Figure 7 For the battery pack structure diagram provided in this embodiment. Please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 In this embodiment, the lower box 100 also includes a surrounding plate 120 arranged at both ends of the bottom plate 110, the large face of the surrounding plate 120 is used to arrange electrical elements inside the battery, and the surrounding plate 120 is perpendicular to the vertical plate 130. The gasket 200 is located on the positioning track 140 and the edge of the surrounding plate 120.

[0064] As Figure 4 shown in , a pull-rivet hole 410 is arranged around the circumference of the surrounding plate 120. When the gasket 200 is arranged along the edge of the surrounding plate 120 and the upper cover plate 300 is buckled with the surrounding plate 120, the gasket 200 can be compressed through the pull-rivet hole 410, so as to control the shrinkage of the gasket 200 arranged on the edge of the surrounding plate 120.

[0065] For example, in this embodiment, the edge of the surrounding plate 120 can use a 2.5mm step pull-rivet nut to fix the upper cover plate 300 on the surrounding plate 120 in a direction perpendicular to the surrounding plate 120.

[0066] Through the above scheme, the surrounding plate 120 is arranged at both ends of the bottom plate 110, the surrounding plate 120 is perpendicular to the vertical plate 130, and the surrounding plate 120 can be used to arrange electrical connection devices. At the same time, this design can enhance the overall rigidity and structural stability of the lower box 100, especially when subjected to external impact or pressure. The gasket 200 is not only located on the positioning track 140, but also arranged along the edge of the surrounding plate 120. Because the gasket 200 covers the positioning track 140 and the edge of the surrounding plate 120, this design can provide more comprehensive sealing effect. When the upper cover plate 300 is buckled, the gasket 200 is compressed in multiple directions, thereby improving the reliability of the sealing.

[0067] When designing the surrounding plate 120, the heat management requirements of the battery pack can be considered. The surrounding plate 120 can be designed with heat dissipation holes or heat dissipation channels to ensure that the hot air inside the battery pack can be effectively discharged to maintain the optimal working temperature of the battery.

[0068] The distance between the two ends of the surrounding plate 120 and the side edge of the bottom plate 110 is less than or equal to the width of the positioning track 140.

[0069] Please refer toFigure 4 The two ends of the surrounding plate 120 are located on a first straight line L1, the side edges of the bottom plate 110 are located on a second straight line L2, and the distance between the two ends of the surrounding plate 120 and the side edges of the bottom plate 110 is the straight line distance from the first straight line L1 to the second straight line L2, and the straight line distance from the first straight line L1 to the second straight line L2 is less than or equal to the width of the positioning track 140.

[0070] According to the above scheme, the two ends of the surrounding plate 120 are designed to be closer to the side edges of the bottom plate 110, so that the surrounding plate 120 matches or is slightly smaller than the width of the positioning track 140, and the sealing gasket 200 can be more smoothly transitioned from the positioning track 140 to the edge of the surrounding plate 120, avoiding the generation of gaps during the transition process. This design can ensure that the sealing gasket 200 is uniformly compressed between the positioning track 140 and the surrounding plate 120, thereby improving the sealing effect. By precisely controlling the distance between the surrounding plate 120 and the side edges of the bottom plate 110, the space can be utilized to the maximum extent, while maintaining the compact size of the battery pack, which helps to improve the energy density of the battery pack.

[0071] In some embodiments, the end of the vertical plate 130 abuts against the surrounding plate 120. The end of the vertical plate 130 and the surrounding plate 120 can be fixedly connected by welding or screwing. The abutment of the end of the vertical plate 130 and the surrounding plate 120 can enhance the structural stability of the entire lower box 100. This structural design helps to disperse and withstand external impact forces, protecting the battery cells and other components inside the battery pack. The connection of the vertical plate 130 and the surrounding plate 120 can simplify the assembly process. This design can make the assembly line more efficient, as the connection of the vertical plate 130 and the surrounding plate 120 provides a stable platform for the alignment and fastening of the upper cover plate 300. The design of the end of the vertical plate 130 abutting against the surrounding plate 120 can ensure the correct position of the sealing gasket 200 on the positioning track 140, which helps to ensure that the sealing gasket 200 is uniformly compressed when the upper cover plate 300 is fastened, thereby improving the sealing performance.

[0072] Please refer to Figure 1 , Figure 2 and Figure 3 In this embodiment, the edge of the bottom plate 110 is provided with a plurality of first positioning structures 131, and the sealing gasket 200 is provided with a plurality of second positioning structures 201 corresponding to the first positioning structures 131, and the second positioning structures 201 are connected with the first positioning structures 131 to enable the sealing gasket 200 to be installed on the bottom plate 110; the first positioning structure 131 and / or the second positioning structure 201 is a groove and / or a protrusion.

[0073] For example, a groove can be provided on the bottom plate 110, and a protrusion can be provided on the sealing gasket 200 at a corresponding position. For example, a protrusion can be provided on the bottom plate 110, and a groove can be provided on the sealing gasket 200 at a corresponding position.

[0074] By the above scheme, the first positioning structure 131 can be designed as a protrusion or a groove, arranged at the edge of the bottom plate 110, for matching with the second positioning structure 201 on the sealing gasket 200. This design can ensure the correct position and fixation of the sealing gasket 200 on the bottom plate 110. The second positioning structure 201 can be designed as a protrusion or a groove matching the shape of the first positioning structure 131, arranged on the sealing gasket 200. When the sealing gasket 200 is installed on the bottom plate 110, these structures are embedded with each other, ensuring that the sealing gasket 200 cannot move or misalign on the bottom plate 110. Through the precise positioning structure matching, the sealing effect of the sealing gasket 200 can be improved, preventing the intrusion of moisture, dust and other contaminants, thereby protecting the battery cells and other components inside the battery pack. The design of the positioning structure should facilitate disassembly and replacement to reduce maintenance time and cost.

[0075] In the present embodiment, the spacing between two adjacent first positioning structures 131 is 2-6 mm.

[0076] By the above scheme, since the length of the bottom plate 110 is relatively long, the spacing of the first positioning structure 131 is set in the range of 2-6 mm, which can ensure that the sealing gasket 200 is evenly distributed on the bottom plate 110, providing a continuous sealing effect. When the spacing of the first positioning structure 131 is less than 2 mm, the first positioning structures 131 are too close, reducing the installation efficiency, and when the spacing of the first positioning structure 131 is greater than 6 mm, the sealing gasket 200 may have the risk of slipping and misalignment, therefore the spacing in the range of 2-6 mm can prevent the sealing gasket 200 from being twisted or misaligned during installation.

[0077] It can be understood that the number of first positioning structures 131 can be increased, especially in the middle area of the bottom plate 110. To avoid the sealing gasket 200 from being offset during installation, facilitate the installation of the sealing gasket 200 and ensure the accurate installation of the sealing gasket 200.

[0078] Please refer to Figure 7, based on the battery pack box structure in the above embodiments, the present embodiment also provides a battery pack, comprising the battery module 500 and the battery pack box structure in the above, the gasket 200 is fixed on the lower box 100, and the battery module 500 is accommodated in the battery pack box structure. The cavity formed by the vertical connection of the top plate 301 and the side plate 302 of the upper cover plate 300 guarantees the firmness of the upper cover plate 300, and meanwhile, the two ends of the upper cover plate 300 are not hindered, so that when installed, the side plate 302 can be pried open in the opposite direction along the central axis of the top plate 301, so as to install the upper cover plate on the lower box, and meanwhile, the side plate 302 and the vertical plate 130 are opposite, so as to compress the gasket 200 on the positioning track 140, and the top plate 301 and the side plate 302 of the upper cover plate 300 compress the gasket 200 on the lower box 100, so as to form a tight seal, prevent the invasion of moisture, dust and other pollutants, and protect the battery pack inside the battery pack.

[0079] Since the battery pack box structure and its beneficial effects have been described in detail in the foregoing embodiments, the present application will not be repeated here.

[0080] The above embodiments are only used to illustrate the technical solutions of the present application, but not to 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 replacement for part of the technical features; and these 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 box structure, characterized in that: The application relates to a battery pack box structure. The lower box body comprises a bottom plate, two sides of the bottom plate are provided with vertical plates which are arranged in parallel with the length direction of the bottom plate, the vertical plates and the side edges of the bottom plate form positioning tracks, the width of the positioning tracks is the straight-line distance between the vertical plates and the side edges of the bottom plate, the width of the positioning tracks is smaller than the first thickness of the sealing gasket, the first thickness is the thickness dimension of the sealing gasket in the direction parallel to the plane of the bottom plate in the natural state of the sealing gasket. The sealing gasket surrounds the lower box body and is located on the positioning tracks. The upper cover plate is provided with a top plate and a side plate which are connected perpendicularly to each other so that the upper cover plate can be covered on the lower box body, the side plate and the vertical plate compress the sealing gasket in the positioning tracks.

2. The battery pack enclosure structure of claim 1, wherein, The lower box body further comprises surrounding plates which are arranged at the two ends of the bottom plate and are arranged perpendicularly to the vertical plates, and the sealing gasket is located on the positioning tracks and the edges of the surrounding plates.

3. The battery pack enclosure structure of claim 1, wherein, The distance between the two ends of the surrounding plates and the side edges of the bottom plate is smaller than or equal to the width of the positioning tracks.

4. The battery pack enclosure structure of claim 3, wherein, The width of the positioning tracks is smaller than or equal to half of the first thickness.

5. The battery pack enclosure structure of claim 4, wherein, The end of the vertical plate abuts against the surrounding plate.

6. The battery pack enclosure structure of claim 5, wherein, The edge of the bottom plate is provided with a plurality of first positioning structures, a plurality of second positioning structures corresponding to the first positioning structures are arranged on the sealing gasket, the second positioning structures are connected with the first positioning structures in a matched mode so that the sealing gasket is mounted on the bottom plate, and the first positioning structures and / or the second positioning structures are grooves and / or protrusions.

7. The battery pack enclosure structure of claim 1, wherein, The interval between two adjacent first positioning structures is 2mm-6mm.

8. The battery pack enclosure structure of claim 7, wherein, The height of the vertical plate is greater than the second thickness of the sealing gasket, and the second thickness is the thickness dimension of the sealing gasket in the direction perpendicular to the bottom plate in the natural state of the sealing gasket.

9. The battery pack enclosure structure of claim 1, wherein, The application further relates to a battery module and the battery pack box structure.

10. A battery pack, characterized by, The application relates to a battery pack box structure.

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