Battery lower box, battery pack and energy storage device

Abstract

The utility model relates to the technical field of energy storage, and specifically provides a battery lower box body, a battery pack and an energy storage device, aiming at solving the problem of low strength and large weight of the existing battery lower box body. To this end, the battery lower box body comprises a box body main part and a resin-based short glass fiber structure part, and the box body main part and the resin-based short glass fiber structure part are integrally formed. By providing the resin-based short glass fiber structure part, the lower box body can better resist external force impact and deformation, and the strength and rigidity of the lower box body of the battery pack are improved. In addition, the resin-based short glass fiber has relatively low density, and can significantly reduce the weight under the condition of meeting the same strength requirement of the lower box body.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, specifically providing a battery lower housing, a battery pack, and an energy storage device. Background Technology

[0002] In the field of energy storage technology, battery packs, as core energy storage units, are widely used in electric vehicles, portable electronic devices, and industrial energy storage systems. With the industry's increasing demands for energy density and safety performance, performance optimization of battery pack structural components has become a key technological development direction. Among these, the lower casing, as the basic component supporting the battery modules and electrical components, directly affects the reliability and service life of the overall structure due to its mechanical properties.

[0003] Traditional battery pack casings are mostly made of metal, which, while possessing high mechanical strength, has inherent drawbacks such as high density and high weight ratio, hindering the improvement of system energy density. To meet the demand for lightweighting, some solutions use engineering plastics or fiber composite materials, but these materials are still insufficient in terms of impact resistance and long-term fatigue resistance, and are prone to deformation or cracking, especially under complex operating conditions.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problems of low strength and heavy weight of the existing battery casing.

[0006] In a first aspect, the present invention provides a lower battery housing, the lower battery housing comprising a housing body and a resin-based short glass fiber structure, wherein the housing body and the resin-based short glass fiber structure are integrally formed.

[0007] In the preferred embodiment of the battery lower housing described above, a reinforcing connection is provided between the housing body and the resin-based short glass fiber structure, and the reinforcing connection is integrally formed with the housing body.

[0008] In the preferred embodiment of the battery lower housing described above, the reinforcing connection portion includes a plurality of first resin-based continuous glass fiber layers and a plurality of first resin-based short glass fiber layers, which are alternately stacked.

[0009] In the preferred embodiment of the battery lower housing described above, the width d of the reinforcing connection is 10~50mm.

[0010] In the preferred embodiment of the battery lower housing described above, the resin-based short glass fiber structure includes a resin-based short glass fiber reinforced structure, which is disposed at the bottom of the housing body.

[0011] In the preferred embodiment of the battery lower housing described above, the resin-based short glass fiber reinforced structure is in the form of a mesh.

[0012] In the preferred embodiment of the battery lower housing described above, the resin-based short glass fiber structure includes a resin-based short glass fiber sealing structure, which is arranged circumferentially along the edge of the housing body, and a first connector is provided in the resin-based short glass fiber sealing structure.

[0013] In the preferred embodiment of the battery lower housing described above, the first connector is disposed on the upper surface of the resin-based short glass fiber sealing structure.

[0014] In the preferred embodiment of the battery lower housing described above, the first connector is a metal connector.

[0015] In the preferred embodiment of the battery lower housing described above, the resin-based short glass fiber structure includes a first resin-based short glass fiber mounting structure, which is disposed on the upper surface of the housing body, and a second connector is provided in the first resin-based short glass fiber mounting structure.

[0016] In the preferred embodiment of the battery lower housing described above, the second connector is disposed on the upper surface of the first resin-based short glass fiber mounting structure.

[0017] In the preferred embodiment of the battery lower housing described above, the second connector is a metal connector.

[0018] In the preferred embodiment of the battery lower housing described above, the first resin-based short glass fiber mounting structure includes a plurality of mounting posts, which are spaced apart on the upper surface of the housing body.

[0019] In the preferred embodiment of the battery lower housing described above, at least some of the mounting posts are connected to the resin-based short glass fiber sealing structure.

[0020] In the preferred embodiment of the battery lower housing described above, a second resin-based short glass fiber mounting structure is connected to one side of the resin-based short glass fiber sealing structure. The second resin-based short glass fiber mounting structure is integrally formed with the resin-based short glass fiber sealing structure, and a third connector is provided on the second resin-based short glass fiber mounting structure.

[0021] In the preferred embodiment of the battery lower housing described above, the third connector is disposed on the upper surface of the second resin-based short glass fiber mounting structure.

[0022] In the preferred embodiment of the battery lower housing described above, the third connector is a metal connector.

[0023] In the preferred embodiment of the battery lower housing described above, the second resin-based short glass fiber mounting structure includes a plurality of mounting blocks, which are spaced apart on one side of the resin-based short glass fiber sealing structure.

[0024] In the preferred embodiment of the battery lower housing described above, ribs are provided at the connection points between the plurality of mounting blocks and the resin-based short glass fiber sealing structure.

[0025] In the preferred embodiment of the battery lower housing described above, the housing body includes a plurality of second resin-based continuous glass fiber layers, which are stacked sequentially.

[0026] In the preferred embodiment of the battery lower housing described above, the housing body further includes a plurality of second resin-based short glass fiber layers, wherein the plurality of resin-based continuous glass fiber layers and the plurality of resin-based short glass fiber layers are alternately stacked and laid.

[0027] In a second aspect, the present invention provides a battery pack, the battery pack including a battery module, a top cover and a lower battery housing as described in any one of the above, the battery module being mounted on the lower battery housing, the top cover being disposed on the battery module, and the top cover being connected to the lower battery housing.

[0028] In a third aspect, the present invention provides an energy storage device, the energy storage device including the aforementioned battery pack, and the battery pack being provided in multiple portions.

[0029] Those skilled in the art will understand that this utility model provides a lower battery casing, comprising a casing body and a resin-based short glass fiber structure, wherein the casing body and the resin-based short glass fiber structure are integrally formed. This technical solution not only improves the strength of the lower casing but also effectively reduces its weight. Specifically, by providing the resin-based short glass fiber structure, the lower casing can better resist external impacts and deformation, improving the strength and rigidity of the battery pack's lower casing. Furthermore, the resin-based short glass fiber has a relatively low density, which significantly reduces weight while meeting the same strength requirements of the lower casing. The integral formation of the casing body and the resin-based short glass fiber structure creates a more compact and stable overall structure. Attached Figure Description

[0030] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0031] Figure 1 This is a schematic diagram of the structure of the lower battery housing of this utility model. Figure 1 ;

[0032] Figure 2This is a structural schematic diagram of the reinforced connecting part of this utility model;

[0033] Figure 3 This is a schematic diagram of the structure of the lower battery housing of this utility model. Figure 2 ;

[0034] Figure 4 This is an exploded view of the lower battery housing of this utility model;

[0035] Figure 5 Figure 4 A magnified view of a portion of point A in the middle.

[0036] List of reference numerals in the attached diagram:

[0037] 1. Box body;

[0038] 2. Resin-based short glass fiber structure; 21. Resin-based short glass fiber reinforced structure; 211. First reinforcing rib; 212. Second reinforcing rib; 22. Resin-based short glass fiber sealing structure; 221. First connector; 23. First resin-based short glass fiber mounting structure; 231. Second connector; 24. Second resin-based short glass fiber mounting structure; 241. Third connector;

[0039] 3. Strengthen the connection parts;

[0040] 4. Ribs. Detailed Implementation

[0041] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although the following embodiments are described in conjunction with a battery pack, the battery lower casing structure provided by the present invention is also applicable to other products that need to address problems such as low structural strength and high weight.

[0042] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] Based on the problems of low strength and heavy weight of the lower casing of existing battery packs pointed out in the background art, this utility model provides a battery lower casing, which is formed by resin, continuous glass fiber and short glass fiber, so as to effectively solve the problems of low strength and heavy weight of the lower casing of existing battery packs.

[0044] like Figure 1As shown, this utility model provides a lower battery housing, which includes a housing body 1 and a resin-based short glass fiber structure 2, and the housing body 1 and the resin-based short glass fiber structure 2 are integrally formed.

[0045] The main body of the enclosure is the main frame of the battery enclosure. It provides basic housing space and overall structural support for the battery, ensuring that the battery can be stably installed and placed in a specific position, while protecting the battery from direct impacts from the external environment.

[0046] The resin-based short glass fiber structure 2 is a composite structure formed by adding short glass fibers (short glass fibers) to resin as the matrix material. This structure can improve the local strength and toughness of the material, especially when dealing with complex stress concentration areas or when it is necessary to enhance local impact resistance. It can effectively disperse stress, significantly enhance the strength and rigidity of the resin matrix, and prevent local damage to the structure under stress.

[0047] Furthermore, the box body 1 and the resin-based short glass fiber structure 2 in this invention are not connected by secondary processing methods such as assembly or welding, but are directly molded into a single unit during the manufacturing process. During the molding process, the resin-based short glass fiber material and the box body 1 material fuse and solidify within the mold, forming a tightly connected structure.

[0048] For example, the one-piece molding process can be achieved by injection molding, compression molding and other molding technologies. This utility model does not specifically limit the process of one-piece molding of the box body part 1 and the resin-based short glass fiber structure part 2.

[0049] Preferably, such as Figure 2 As shown, a reinforcing connection 3 is provided between the main body 1 and the resin-based short glass fiber structure 2, and the reinforcing connection 3 is integrally formed with the main body 1.

[0050] By providing a reinforcing connection 3 between the main body 1 and the resin-based short glass fiber structure 2, the connection strength between the main body 1 and the resin-based short glass fiber structure 2 can be enhanced, forming a tighter and more stable overall structure. For example, when the vehicle experiences severe bumps or collisions, the reinforcing connection 3 can prevent the connection from breaking due to excessive force, ensuring that the battery module and other components remain in a stable position and avoiding battery damage or performance degradation due to structural loosening.

[0051] Furthermore, the reinforced connection 3 alters the stress transmission path, resulting in a more uniform stress distribution at the connection point. Stress originally concentrated at the connection between the main body 1 and the resin-based short glass fiber structure 2 is dispersed to the reinforced connection 3 and its surrounding area, thereby reducing localized stress levels. This helps reduce the risk of structural damage due to stress concentration and improves the overall load-bearing capacity of the battery housing.

[0052] Furthermore, the integrated molding of the connecting part 3 and the main body 1 eliminates the weak points that may exist in traditional connection methods, making the main body 1 and the resin-based short glass fiber structure 2 a tight and unified whole. This integrated structure can better transmit forces and torques, improve the structural stability and reliability of the battery lower casing, and reduce safety hazards caused by loosening or failure of the connection parts.

[0053] Furthermore, the reinforcing connection 3 is integrally formed with the box body 1, so that the reinforcing connection 3 and the box body 1 are on the same plane, avoiding bending of the composite reinforcing structure. This can prevent stress concentration in the composite reinforcing structure and reduce the risk of fatigue failure caused by excessive local stress, which helps to further improve the structural stability and reliability of the box.

[0054] Preferably, such as Figure 2 As shown, the reinforcing connection 3 includes a plurality of first resin-based continuous glass fiber layers and a plurality of first resin-based short glass fiber layers, which are alternately stacked.

[0055] In this invention, the reinforcing connection 3 is formed by laminating a first resin-based continuous glass fiber layer and a first resin-based short glass fiber layer. Because continuous glass fiber has high strength and modulus, it can withstand greater tensile and compressive forces, providing excellent mechanical support, thus making the reinforcing connection 3 less prone to deformation and damage under external forces. Short glass fiber, on the other hand, can improve the material's flowability and molding properties to a certain extent, while also enhancing its strength. The combination of these two materials allows for the full utilization of their respective advantages, forming a reinforcing structure with superior overall performance, thereby significantly improving the connection strength between the box body 1 and the resin-based short glass fiber structure 2.

[0056] Preferably, such as Figure 2 As shown, the width d of the reinforcing connection 3 is 10~50mm.

[0057] A width d within the range of 10~50mm can meet the connection strength requirements between the main body 1 and the resin-based short glass fiber structure 2, preventing the connection from breaking or separating from the main body 1 and the resin-based short glass fiber structure 2 due to local stress concentration, ensuring the stability of the connection under stress, and avoiding increased manufacturing difficulty or cost due to excessive width.

[0058] It should be noted that in other embodiments, the width d of the reinforcing connection 3 can be adaptively adjusted according to different forces, loads, etc. For example, the width d of the reinforcing connection 3 can also be 60mm, 80mm, 100mm, etc. This utility model does not specifically limit the width d of the reinforcing connection 3.

[0059] Preferably, such as Figure 3 As shown, the resin-based short glass fiber structure 2 includes a resin-based short glass fiber reinforced structure 21, which is disposed at the bottom of the housing body 1.

[0060] The resin-based short glass fiber reinforced structure 21 utilizes the reinforcing effect of short glass fibers in the resin matrix to significantly improve the strength, stiffness, and toughness of the casing body 1. When the casing body 1 is subjected to loads such as tension, compression, and bending moment, the resin-based short glass fiber reinforced structure 21 can effectively disperse stress, preventing local deformation, cracking, or even breakage of the casing body 1, thereby providing more reliable protection for the battery and ensuring the safe and stable operation of the battery system.

[0061] By reinforcing the main body 1 of the battery housing with resin-based short glass fiber reinforced structural part 21, the structural stability of the entire battery housing is improved. During long-term battery use, it can effectively reduce housing deformation caused by external forces or temperature changes, ensure the accurate installation position of the battery inside the housing, avoid problems such as damage to internal battery components or loose connections caused by housing deformation, and improve the reliability and service life of the battery system.

[0062] Furthermore, resin-based short glass fiber materials have a lower density than traditional metal materials, which can enhance the function of the main body of the battery box while maintaining the lightweight advantage of the battery box.

[0063] Preferably, such as Figure 4 As shown, the resin-based short glass fiber reinforced structure 21 is in the form of a mesh.

[0064] By arranging the resin-based short glass fiber reinforced structural portion 21 in a mesh pattern, the structural strength of the housing body portion 1 can be further improved. For example, as shown... Figure 4 As shown, the resin-based short glass fiber reinforced structure 21 in this utility model consists of first reinforcing ribs 211 spaced apart along a first direction and second reinforcing ribs 212 spaced apart along a second direction, with the first direction being perpendicular to the second direction.

[0065] Therefore, the first reinforcing rib 211 and the second reinforcing rib 212 in this invention intersect each other perpendicularly, forming a grid-like structure at the bottom of the box body 1. This arrangement effectively strengthens the box body 1 in two mutually perpendicular directions, improving its resistance to deformation and its load-bearing capacity. For example, when the box body 1 is subjected to external forces from different directions, the reinforcing ribs in the two directions can work together to disperse and transfer the external forces to the entire box structure, avoiding excessive stress concentration in local areas.

[0066] It should be noted that, since the resin-based short glass fiber reinforced structure 21 is specifically designed to reinforce the box body 1, its layout and design can be tailored to key areas based on the actual stress conditions and structural characteristics of the box body 1. For example, the number of resin-based short glass fiber reinforced structures 21 or their structural form can be increased or adjusted at the joints, edges, bottom, or areas prone to impact of the box body 1 to achieve a more precise and effective reinforcement effect. This utility model does not specifically limit the specific arrangement and location of the resin-based short glass fiber reinforced structure 21.

[0067] Preferably, such as Figures 3 to 5 As shown, the resin-based short glass fiber structure 2 includes a resin-based short glass fiber sealing structure 22, which is arranged circumferentially along the edge of the housing body 1, and a first connector 221 is provided in the resin-based short glass fiber sealing structure 22.

[0068] The main function of the resin-based short glass fiber sealing structure 22 is to seal the main body 1 of the battery. In this invention, the resin-based short glass fiber sealing structure 22 is arranged circumferentially along the edge of the main body 1 of the battery, forming a complete sealing ring, which can seal the edge of the main body 1 of the battery from all directions. Compared with partial or dispersed sealing structures, this circumferential seal can effectively prevent external moisture, dust, impurities, etc. from entering the interior of the battery lower casing from any possible gaps, providing a relatively independent and clean working environment for the battery pack.

[0069] Exemplarily, in this invention, the main function of the resin-based short glass fiber sealing structure 22 is to seal the space between the main body 1 and the battery box cover on the main body 1. This prevents moisture and dust from entering the battery box, reducing the risk of battery failure due to external environmental factors and extending battery life.

[0070] It should be noted that the resin-based short glass fiber sealing structure 22 provided by this utility model can also be set at the connection between the main body 1 and other components, openings, or other locations where it is necessary to prevent the entry of external substances (such as water, dust, moisture, etc.) or the leakage of internal substances (such as electrolyte, gas, etc.). It achieves a good sealing effect through its own structural characteristics and material properties. This utility model does not limit the specific arrangement and form of the resin-based short glass fiber sealing structure 22, as long as it can satisfy the sealing effect of the main body 1.

[0071] Furthermore, using resin-based short glass fiber materials to fabricate the sealing structure offers a cost advantage over traditional sealing materials such as rubber and silicone, reducing overall manufacturing costs. It also reduces the overall weight of the battery's lower casing.

[0072] This invention incorporates a first connector 221 within the resin-based short glass fiber sealing structure 22, achieving an organic combination of connection and sealing functions. This design ensures a reliable connection between the lower battery casing and the upper battery casing, guaranteeing the stability and safety of the battery system, while preventing the sealing performance from being compromised by the presence of the connection point.

[0073] Preferably, the first connector 221 is disposed on the upper surface of the resin-based short glass fiber sealing structure 22.

[0074] The first connector 221 is placed on the upper surface of the resin-based short glass fiber sealing structure 22. When assembling the lower battery case and the upper battery case cover, the operator can more easily access the connector and perform the installation operation.

[0075] Furthermore, placing the first connector 221 on the upper surface will not interfere with the sealing contact surface between the resin-based short glass fiber sealing structure 22 and the battery box cover. The sealing contact surface remains intact and continuous, ensuring that the sealing structure can fully perform its sealing function, effectively preventing external substances from entering the lower battery casing and ensuring the safe operation of the battery.

[0076] Preferably, the first connector 221 is a metal connector.

[0077] Metal materials typically possess high strength and rigidity, enabling metal connectors to withstand significant tensile, compressive, and shear forces. During the connection between the lower battery casing and the upper battery cover, metal connectors ensure a secure bond, preventing loosening or breakage, thus greatly improving the reliability and stability of the connection and guaranteeing the safe operation of the battery box under various working conditions.

[0078] It should be noted that the first connecting member 221 can be a bolt, nut, clip, rivet, or other similar type. This utility model does not limit the specific type of the first connecting member 221.

[0079] Preferably, such as Figures 3 to 5 As shown, the resin-based short glass fiber structure 2 includes a first resin-based short glass fiber mounting structure 23, which is disposed on the upper surface of the housing body 1, and a second connector 231 is disposed in the first resin-based short glass fiber mounting structure 23.

[0080] In this invention, the first resin-based short glass fiber mounting structure 23 is specifically disposed on the upper surface of the housing body 1, providing a clear mounting position for components such as battery modules. Through the second connector 231 disposed therein, components such as battery modules can be precisely fixed to the lower battery housing, ensuring the stable position of the battery modules within the lower battery housing, thereby guaranteeing the normal operation and safety of the battery system.

[0081] In addition, the resin-based short glass fiber material has good mechanical properties. The first resin-based short glass fiber mounting structure 23 is made of this material, which can provide a reliable support foundation for the second connector 231. It can withstand the large weight of components such as the battery module and various stresses generated during vehicle operation, improve the connection strength between the battery module and the lower battery box, and reduce the risk of connection failure.

[0082] Furthermore, resin-based short glass fiber materials have a lower density compared to traditional metal materials (such as steel, aluminum alloys, and other materials used in mounting structures). The first resin-based short glass fiber mounting structure part 23 is made of this material, which significantly reduces the overall weight of the battery lower casing while meeting the installation strength requirements.

[0083] Preferably, the second connector 231 is disposed on the upper surface of the first resin-based short glass fiber mounting structure 23.

[0084] The second connector 231 is disposed on the upper surface of the first resin-based short glass fiber mounting structure 23. When fixing components such as battery modules to the lower battery housing, the operator can more easily access the connector without having to search for connection points in the complex internal structure of the housing. This makes the installation operation more intuitive and convenient, reduces the installation difficulty, and improves assembly efficiency.

[0085] Preferably, the second connector 231 is a metal connector.

[0086] Metal materials typically possess high strength and rigidity, enabling metal connectors to withstand significant tensile, compressive, and shear forces. During the connection process between the battery casing and components such as the battery module, metal connectors ensure a secure bond, preventing loosening or breakage, thus greatly improving the reliability and stability of the connection and further guaranteeing the safe operation of the battery box under various working conditions.

[0087] It should be noted that the second connecting member 231 can be a bolt, nut, clip, rivet, or other similar type. This utility model does not limit the specific type of the second connecting member 231.

[0088] Preferably, such as Figure 5 As shown, the first resin-based short glass fiber mounting structure 23 includes a plurality of mounting posts, which are spaced apart on the upper surface of the housing body 1.

[0089] Multiple spaced mounting posts provide clear mounting points for components such as battery modules. Battery modules can be precisely placed according to the positions of these mounting posts, ensuring accurate positioning within the battery casing.

[0090] The spaced mounting columns provide support for the battery module from multiple locations, forming a multi-point support structure. This support method effectively distributes the weight of the battery module, keeping it stable within the battery casing and reducing swaying and displacement caused by vibration, bumps, and other factors, thereby improving the reliability and safety of the battery system.

[0091] In addition, the spaced mounting posts can evenly distribute the force on the battery module across the posts, avoiding structural damage caused by excessive local stress and improving the load-bearing capacity and durability of the connection between the battery module and the battery casing.

[0092] Preferably, at least some of the mounting posts are connected to the resin-based short glass fiber sealing structure 22.

[0093] Some mounting posts are connected to the resin-based short glass fiber sealing structure 22, so that the first resin-based short glass fiber mounting structure 23 and the resin-based short glass fiber sealing structure 22 form an interconnected and mutually supportive integrated structure. This integrated design can better distribute and transfer the weight of the battery module, avoid damage to local structures due to concentrated stress, and improve the overall strength and stability of the battery lower casing.

[0094] Furthermore, the connection between the mounting post and the resin-based short glass fiber sealing structure 22 effectively adds support points to the resin-based short glass fiber sealing structure 22. These support points enhance the structural rigidity and stability of the resin-based short glass fiber sealing structure 22, reduce deformation of the resin-based short glass fiber sealing structure 22 under external forces or during long-term use, thereby reducing the risk of seal failure.

[0095] It should be noted that the mounting column in this invention has a columnar structure. In other embodiments, the mounting column can also be a block-shaped structure, a spherical structure, etc. This invention does not limit the specific structural form of the mounting column.

[0096] Preferably, such as Figures 3 to 5 As shown, a second resin-based short glass fiber mounting structure 24 is connected to one side of the resin-based short glass fiber sealing structure 22. The second resin-based short glass fiber mounting structure 24 is integrally formed with the resin-based short glass fiber sealing structure 22, and a third connector 241 is provided on the second resin-based short glass fiber mounting structure 24.

[0097] The provision of the second resin-based short glass fiber mounting structure 24 increases the mounting points for the lower battery housing. Exemplarily, in this invention, the second resin-based short glass fiber mounting structure 24 is used to connect the lower battery housing to external structures such as the module frame and support beams. Through the second resin-based short glass fiber mounting structure 24, the lower battery housing can be firmly fixed to the external structures such as the module frame and support beams, ensuring that the lower battery housing will not be displaced or damaged due to impact.

[0098] In addition, the resin-based short glass fiber material itself has a low density. The integrally molded second resin-based short glass fiber mounting structure 24 and resin-based short glass fiber sealing structure 22 significantly reduce the overall weight of the battery lower box compared with traditional metal mounting and sealing structures, while meeting the strength and functional requirements.

[0099] Preferably, the third connector 241 is disposed on the upper surface of the second resin-based short glass fiber mounting structure 24.

[0100] The third connector 241 is placed on the upper surface of the second resin-based short glass fiber mounting structure 24, so that when the lower battery box is fixed to the module frame, support beam and other external structures by the third connector 241, the operator can see the position of the connector more intuitively, which facilitates alignment and operation and improves installation efficiency.

[0101] Preferably, the third connector 241 is a metal connector.

[0102] Metal materials typically possess high strength and rigidity, enabling metal connectors to withstand significant tensile, compressive, and shear forces. During the connection process between the battery lower casing and external structures such as the module frame and support beams, metal connectors ensure a secure connection, preventing loosening or breakage, thus greatly improving the reliability and stability of the connection and further guaranteeing the safe operation of the battery box under various working conditions.

[0103] It should be noted that the third connector 241 can be a bolt, nut, clip, rivet, or other similar type. This utility model does not limit the specific type of the third connector 241.

[0104] Preferably, such as Figure 5 As shown, the second resin-based short glass fiber mounting structure 24 includes a plurality of mounting blocks, which are spaced apart on one side of the resin-based short glass fiber sealing structure 22.

[0105] In this invention, each mounting block can serve as an independent positioning point, providing precise installation positions for other components within the battery system. Furthermore, the multiple spaced mounting blocks distribute stress, preventing structural damage caused by excessive localized stress and improving the overall load-bearing capacity and durability of the battery's lower casing.

[0106] It should be noted that the shape and size of each mounting block in this invention are not all identical and can be flexibly changed according to location and connection requirements. Therefore, different types and sizes of mounting blocks provide more connection possibilities. For components with irregular shapes or special installation locations, suitable mounting blocks can be selected for installation, or multiple mounting blocks can be combined to achieve complex installation requirements. This invention does not specifically limit the shape and size of the mounting blocks.

[0107] Preferably, such as Figure 5 As shown, ribs 4 are provided at the connection points between the multiple mounting blocks and the resin-based short glass fiber sealing structure 22.

[0108] The rib 4 can increase the cross-sectional area at the connection between the mounting block and the resin-based short glass fiber sealing structure 22, thereby better dispersing the stress borne by the connection part; in addition, the presence of the rib 4 can enhance the torsional resistance at the connection between the mounting block and the sealing structure, prevent the connection part from twisting and deforming, ensure the integrity of the battery lower box structure, and thus ensure the normal installation and operation of the internal components of the battery system.

[0109] Preferably, in one embodiment, the housing body 1 includes a plurality of second resin-based continuous glass fiber layers, which are stacked sequentially.

[0110] Continuous glass fiber is a type of glass fiber with a relatively long and continuous length. Compared to short glass fibers, continuous glass fiber can form a more continuous and complete fiber network structure in the structural layers. This continuous fiber network structure can more effectively transfer stress, giving the main body of the casing higher strength and rigidity. When the battery casing is subjected to impacts, compression, or other stresses, it can better protect the internal battery pack, reduce the risk of deformation and damage, and ensure the safe and stable operation of the battery pack.

[0111] The multi-layered structure and the continuity of the glass fiber help to disperse stress and reduce stress concentration. This significantly improves the fatigue resistance of the main body 1 when subjected to long-term cyclic loads, extending the service life of the battery lower housing and reducing the failure rate caused by fatigue failure.

[0112] Furthermore, resin-based continuous glass fiber materials have a lower density compared to some traditional metal materials. Using this material to fabricate the main body of the battery casing 1 allows for a lightweight design of the battery's lower casing while maintaining sufficient mechanical properties. This lightweight design helps reduce the overall weight of the battery system.

[0113] Preferably, in another embodiment, the housing body 1 further includes a plurality of second resin-based short glass fiber layers, wherein a plurality of resin-based continuous glass fiber layers and a plurality of resin-based short glass fiber layers are laid alternately.

[0114] The staggered resin-based continuous glass fiber structure layer and resin-based short glass fiber structure layer combine the high-strength directional load-bearing capacity of continuous glass fiber with the isotropic reinforcement effect of short glass fiber. This combination enables the main body 1 of the enclosure to effectively bear loads in different directions. Whether it is tensile or compressive loads along the direction of continuous glass fiber, or complex and variable stresses in other directions, they can be well dispersed and transferred, thereby improving the overall multi-directional load-bearing capacity of the enclosure.

[0115] Furthermore, compared to using continuous glass fiber materials throughout, using short glass fiber materials in certain areas can reduce material costs while maintaining overall performance. Short glass fiber materials are generally less expensive, and by rationally adjusting the ratio of the two structural layers, it is possible to effectively control material costs while meeting the performance requirements of the battery casing.

[0116] In addition, this utility model provides a battery pack (not shown in the figure), the battery box includes a battery module, a top cover and a lower battery box body of any of the above, the battery module is installed on the lower battery box body, the top cover is placed on the battery module, and the top cover is connected to the lower battery box body.

[0117] Because the aforementioned battery lower casing has the advantages of being lightweight and high-strength, the battery pack made using this battery lower casing also has the advantages of being lightweight and high-strength, and can effectively protect the battery module.

[0118] Preferably, a sealing gasket (not shown in the figure) is provided between the lower casing and the upper cover of the battery box of this invention. This sealing gasket seals the space between the lower casing and the upper cover, further preventing leakage of internal materials and the entry of external impurities.

[0119] In addition, this utility model provides an energy storage device (not shown in the figure), which includes multiple battery packs.

[0120] The battery lower casing, with its high strength, provides reliable physical protection for the battery module; in addition, the lightweight nature of the battery lower casing reduces the weight of the entire energy storage device.

[0121] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A battery lower casing, characterized in that, The lower battery housing includes a housing body (1) and a resin-based short glass fiber structure (2), and the housing body (1) and the resin-based short glass fiber structure (2) are integrally formed; the housing body (1) includes a plurality of second resin-based continuous glass fiber layers, and the plurality of second resin-based continuous glass fiber layers are stacked sequentially.

2. The battery lower housing according to claim 1, characterized in that, A reinforcing connection (3) is provided between the box body part (1) and the resin-based short glass fiber structure part (2), and the reinforcing connection part (3) is integrally formed with the box body part (1).

3. The lower battery housing according to claim 2, characterized in that, The reinforcing connection (3) includes a plurality of first resin-based continuous glass fiber layers and a plurality of first resin-based short glass fiber layers, which are alternately stacked.

4. The lower battery housing according to claim 2, characterized in that, The width d of the reinforced connecting part (3) is 10~50mm.

5. The lower battery housing according to claim 1, characterized in that, The resin-based short glass fiber structure (2) includes a resin-based short glass fiber reinforced structure (21), which is disposed at the bottom of the box body (1).

6. The lower battery housing according to claim 5, characterized in that, The resin-based short glass fiber reinforced structure (21) is in the form of a mesh.

7. The lower battery housing according to claim 1, characterized in that, The resin-based short glass fiber structure (2) includes a resin-based short glass fiber sealing structure (22), which is arranged circumferentially along the edge of the box body (1), and a first connector (221) is provided in the resin-based short glass fiber sealing structure (22).

8. The lower battery housing according to claim 7, characterized in that, The first connector (221) is disposed on the upper surface of the resin-based short glass fiber sealing structure (22).

9. The lower battery housing according to claim 7, characterized in that, The first connector (221) is a metal connector.

10. The lower battery housing according to claim 7, characterized in that, The resin-based short glass fiber structure (2) includes a first resin-based short glass fiber mounting structure (23), which is disposed on the upper surface of the housing body (1), and a second connector (231) is disposed in the first resin-based short glass fiber mounting structure (23).

11. The lower battery housing according to claim 10, characterized in that, The second connector (231) is disposed on the upper surface of the first resin-based short glass fiber mounting structure (23).

12. The lower battery housing according to claim 10, characterized in that, The second connector (231) is a metal connector.

13. The lower battery housing according to claim 10, characterized in that, The first resin-based short glass fiber mounting structure (23) includes a plurality of mounting posts, which are spaced apart on the upper surface of the housing body (1).

14. The lower battery housing according to claim 13, characterized in that, Of the plurality of mounting posts, at least a portion of the mounting posts are connected to the resin-based short glass fiber sealing structure (22).

15. The lower battery housing according to claim 7, characterized in that, A second resin-based short glass fiber mounting structure (24) is connected to one side of the resin-based short glass fiber sealing structure (22). The second resin-based short glass fiber mounting structure (24) is integrally formed with the resin-based short glass fiber sealing structure (22). A third connector (241) is provided on the second resin-based short glass fiber mounting structure (24).

16. The lower battery housing according to claim 15, characterized in that, The third connector (241) is disposed on the upper surface of the second resin-based short glass fiber mounting structure (24).

17. The lower battery housing according to claim 15, characterized in that, The third connector (241) is a metal connector.

18. The lower battery housing according to claim 15, characterized in that, The second resin-based short glass fiber mounting structure (24) includes a plurality of mounting blocks, which are spaced apart on one side of the resin-based short glass fiber sealing structure (22).

19. The lower battery housing according to claim 18, characterized in that, Ribs (4) are provided at the connection between the plurality of mounting blocks and the resin-based short glass fiber sealing structure (22).

20. The lower battery housing according to claim 1, characterized in that, The main body of the box (1) also includes a plurality of second resin-based short glass fiber layers, and the plurality of resin-based continuous glass fiber layers and the plurality of resin-based short glass fiber layers are alternately stacked and laid.

21. A battery pack, characterized in that, The device includes a battery module, a top cover, and a lower battery housing according to any one of claims 1 to 20, wherein the battery module is mounted on the lower battery housing, the top cover is disposed on the battery module, and the top cover is connected to the lower battery housing.

22. An energy storage device, characterized in that, The energy storage device includes the battery pack of claim 21, and the battery pack is provided in multiple forms.

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