Battery device and electric equipment

Abstract

The utility model provides a battery device and electric equipment. The battery device comprises a battery assembly and a lower box body, the lower box body comprises a first box body part and a second box body part; the battery assembly is arranged on the first box body part; the second box body part is connected to the first side of the first box body part in the first direction perpendicular to the height direction of the lower box body, and the structural strength of the second box body part is smaller than that of the first box body part. According to the battery device, the protection requirement is met, the cost is reduced, and the weight is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery device and electric equipment. BACKGROUND

[0002] The battery device is the important power source of electric automobile, but the bottom of the battery device is easy to be impacted and scratched to cause the safety accident of the electric automobile, so that the bottom protection of the battery device is paid more and more attention.

[0003] However, the bottom protection scheme of the existing battery device is difficult to simultaneously consider the light quality and low manufacturing cost of the battery device. UTILITY MODEL CONTENTS

[0004] The battery device and electric equipment provided by the application aim to solve the problem that the bottom protection scheme of the existing battery device is difficult to simultaneously consider the light quality and low manufacturing cost of the battery device.

[0005] To solve the above technical problem, one technical scheme adopted by the application is to provide a battery device. The battery device comprises a battery assembly and a lower box body, the lower box body comprises a first box body part and a second box body part; the battery assembly is arranged on the first box body part; the second box body part is connected to the first side of the first box body part along a first direction perpendicular to the height direction of the lower box body, and the structural strength of the second box body part is less than that of the first box body part.

[0006] The above scheme can improve the torsional rigidity and extrusion strength of the lower box body by using a plate material with large structural strength for the first box body part of the lower box body for bearing the battery assembly, so as to well support the battery assembly; and the second box body part uses a plate material with small structural strength. In this way, not only can the bottom of the battery device be protected by the lower box body, but also the overall quality of the lower box body is lighter compared to using a plate material with large structural strength for the entire lower box body; and compared to the composite material guard plate, the process manufacturing cost is significantly reduced without using expensive guard plate molds and hot pressing processes; so that the battery device can consider light quality and low manufacturing cost.

[0007] In one embodiment, the lower box body further comprises a third box body part, the third box body part is connected to the second side of the first box body part along the first direction, and the structural strength of the third box body part is less than that of the first box body part.

[0008] The above scheme can make the battery assembly located at the central position or the position close to the center of the lower box body, so that the stress of the lower box body is more uniform, and the overall balance of the battery device is better; and the risk of damage of the battery assembly caused by shaking or displacement can be reduced.

[0009] In one embodiment, the second box part comprises a second bottom plate; the third box part comprises a third bottom plate; the lower box further comprises a first reinforcing plate, the first reinforcing plate is arranged on at least the second bottom plate, and the structural strength of the first reinforcing plate is greater than that of the second box part; and / or the lower box further comprises a second reinforcing plate, the second reinforcing plate is arranged on at least the third bottom plate, and the structural strength of the second reinforcing plate is greater than that of the third box part.

[0010] The above scheme can meet the bottom scratch and collision test requirements of the battery device without additional bottom protection plates, and the structural weight of the battery device is also less than that of the traditional steel protection plate. At the same time, the expensive mold and hot pressing process of the composite material bottom protection plate are cancelled, the process manufacturing cost is significantly reduced, and the three balance of safety, light weight and cost is truly realized. Moreover, compared with the scheme in which the entire lower box is made of a plate material with high structural strength, the use of expensive materials can be saved while improving the strength of the second box part and / or the third box part, and the process manufacturing cost is reduced.

[0011] In one embodiment, the first reinforcing plate is provided with a first reinforcing rib; and / or the second reinforcing plate is provided with a second reinforcing rib.

[0012] The above scheme can improve the local strength or rigidity of the first reinforcing plate by providing the first reinforcing rib on the first reinforcing plate. The local strength or rigidity of the second reinforcing plate can be improved by providing the second reinforcing rib on the second reinforcing plate.

[0013] In one embodiment, the first reinforcing rib is formed by stamping the first reinforcing plate; and / or the second reinforcing rib is formed by stamping the second reinforcing plate.

[0014] The above scheme can realize local high strength of the reinforcing plate without increasing the thickness of the reinforcing plate by stamping the first reinforcing rib and / or the second reinforcing rib from the corresponding reinforcing plate, compared with the scheme of directly adding reinforcing ribs on the reinforcing plate.

[0015] In one embodiment, the width of the first reinforcing rib gradually decreases along the direction away from the second bottom plate in the cross section along the height direction of the lower box; and / or the width of the second reinforcing rib gradually decreases along the direction away from the third bottom plate in the cross section along the height direction of the lower box. In this way, the local structural strength of the reinforcing plate can be further improved.

[0016] In one embodiment, the number of the first reinforcing ribs is multiple, and at least part of the first reinforcing ribs extend in the first direction; and / or the number of the second reinforcing ribs is multiple, and at least part of the second reinforcing ribs extend in the first direction.

[0017] The first reinforcing rib and / or the second reinforcing rib are arranged continuously along the main load bearing path of the electrical equipment, thereby effectively improving the load bearing capacity of the lower box along the main load bearing direction.

[0018] In one embodiment, the second box portion is provided with a first structural member on the side facing the battery assembly; the first reinforcing plate is provided with a first avoiding hole corresponding to the position of the first structural member; and / or the third box portion is provided with a second structural member on the side facing the battery assembly; the second reinforcing plate is provided with a second avoiding hole corresponding to the position of the second structural member.

[0019] The above scheme can not only reduce the interference of the first reinforcing plate and / or the second reinforcing plate with the structural member on the lower box, but also reduce the mass of the first reinforcing plate and / or the second reinforcing plate, thereby achieving the effect of weight reduction.

[0020] In one embodiment, the second box portion is configured to be arranged towards the front end of the electrical equipment; and the first reinforcing plate covers the entire second bottom plate.

[0021] When the battery device is used in a vehicle, the front chassis of the vehicle is lower than the rear chassis, i.e., the front chassis of the vehicle is closer to the ground, and is more likely to be hit or scratched by stones, flanges and other foreign matters, i.e., the second box portion is more likely to be impacted and expanded. The above scheme uses a reinforcing plate with a large area to reinforce and protect the second box portion, which can diffuse the shock wave in the first time and reduce the local pressure of the second box portion, thereby protecting the bottom of the battery device.

[0022] In one embodiment, the second reinforcing plate covers part of the third bottom plate.

[0023] The above scheme arranges the third box portion at the rear end of the electrical equipment, and the distance between the third box portion and the ground is large, so the probability of the third box portion being impacted or collided is small. The above scheme makes the second reinforcing plate cover part of the third bottom plate, which can not only improve the structural strength to meet the protection requirements, but also reduce the overall weight of the lower box as much as possible, reduce the risk of redundant mass, and reduce the interference of the reinforcing plate with other structural members in the lower box.

[0024] In one embodiment, the third box portion further comprises a third side wall connected to the third bottom plate; the second reinforcing plate is arranged at the connection between the third bottom plate and the third side wall; and the second reinforcing plate comprises a first plate portion and a second plate portion connected in sequence, the first plate portion is arranged on the third bottom plate, and the second plate portion is arranged on the third side wall.

[0025] The third bottom plate and the third side wall of the third box portion are provided with the second reinforcing plate, so that the connection strength of the corner of the third box portion is enhanced, and the second reinforcing plate is arranged at the corner of the third box portion, so that the arrangement is simple and the interference with other structural members in the lower box is small.

[0026] In one embodiment, a profile of a side surface of the first reinforcing plate facing the second box portion matches a profile of a side surface of the second box portion facing the first reinforcing plate; and / or,

[0027] A profile of a side surface of the second reinforcing plate facing the third box portion matches a profile of a side surface of the third box portion facing the second reinforcing plate.

[0028] The reinforcing plate and the corresponding box portion are matched, so that the structural strength of the overall lower box is improved.

[0029] To solve the above technical problems, another technical scheme adopted by the present application is to provide a power consumption device including the battery device.

[0030] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and to implement the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0031] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be limiting on the present application. Moreover, the same reference numerals are used to represent the same components throughout the drawings. In the drawings:

[0032] Figure 1 The structural schematic diagram of the power consumption device provided by the present application is shown;

[0033] Figure 2 The structural diagram of the battery device provided by an embodiment of the present application is shown;

[0034] Figure 3 The structural diagram of the battery device provided by another embodiment of the present application is shown;

[0035] Figure 4 The overall structural schematic diagram of the lower box provided by an embodiment of the present application is shown;

[0036] Figure 5 The exploded schematic diagram of the first box portion, the second box portion and the third box portion provided by an embodiment of the present application is shown;

[0037] Figure 6 A disassembled view of the lower box body is shown in FIG. 1B. Figure 4

[0038] Figure 7 A schematic view of the overall structure of the first reinforcing plate is shown in FIG. 2A.

[0039] Figure 8 A schematic view of the overall structure of the second reinforcing plate is shown in FIG. 2B. Figure 7 An enlarged view of A in the structure shown in FIG. 2B.

[0040] Figure 9 A schematic view of the overall structure of the second reinforcing plate is shown in FIG. 2B.

[0041] Legend of Reference Signs

[0042] 100: electrical device; 200: battery device

[0043] 10: battery assembly; 20: lower box body; 21: first box part; 211: first bottom plate; 212: first side wall; 22: second box part; 221: second bottom plate; 222: second side wall; 23: third box part; 231: third bottom plate; 232: third side wall; 24: first reinforcing plate; 241: first reinforcing rib; 242: first avoiding hole; 25: second reinforcing plate; 251: second reinforcing rib; 252: second avoiding hole; 253: first plate part; 254: second plate part. DETAILED DESCRIPTION

[0044] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0045] 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 terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0047] ​Reference to“an embodiment” herein 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 referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments in accordance with the application.

[0048] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” herein generally means that the front and rear associated objects are in an“or” relationship.

[0049] In the description of the embodiments of the application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0050] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like 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 embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0051] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0052] The battery device generally adopts a bottom liquid cooling design, that is, a liquid cooling plate is arranged below the battery assembly by means of glue or locking and the like. In order to meet the user's demand for bottom impact protection of the battery device, a layer of high-strength bottom protection plate is usually added at the bottom of the liquid cooling plate. The bottom protection plate and the box frame are double-fixed by bolt locking or high-toughness structural glue to form a closed and continuous protection system, effectively isolating the direct impact of foreign matters such as gravel and flanges, significantly reducing the risk of cooling circuit damage and thermal runaway of the battery device due to scratching or collision and the like at the bottom, and ensuring the safety and reliability of the vehicle.

[0053] At present, the bottom protection plate generally adopts a high-strength steel protection plate. The steel protection plate can realize mass production in a low cost and short cycle by means of mature stamping, welding and surface treatment processes, and provides excellent impact resistance and puncture resistance for the battery device. However, the steel protection plate has a high density, which increases the overall weight of the battery device by 3 kg to 5 kg. The additional weight of the battery device not only increases the power consumption and shortens the vehicle endurance of the electric equipment, but also has a chain negative impact on the braking and stability of the electric equipment.

[0054] Therefore, in some technologies, a composite material protection plate is used to replace the steel protection plate. The composite material protection plate is composed of a flame-retardant resin matrix, a lightweight foam core and a continuous fiber reinforced layer, and can reduce the weight of the battery device by more than 40% under the same protection level. However, the composite material protection plate has a long process cycle of multi-process hot pressing, resin transfer molding (RTM) or automatic tape laying, high tooling investment, and the yield is significantly affected by environmental temperature and humidity and fiber arrangement, resulting in a cost of a single composite material protection plate being 3 to 5 times that of the steel protection plate, and the maintenance and recycling system is not perfect.

[0055] Therefore, the bottom protection scheme of the existing battery device is difficult to balance the light weight and low manufacturing cost.

[0056] Based on this, the embodiment of the present application provides a new battery device, which breaks through the traditional weight increasing path of "adding an independent bottom protection plate under the liquid cooling plate", and proposes a new light-weight protection route of "subarea tailor-welded box body + local reinforcement". The new lower box body is divided into front, middle and rear three box body parts according to the main bearing direction of the vehicle along the battery lower box body, wherein the front and rear box body parts are made of sheet material with low yield strength but good ductility, such as low carbon steel sheet, which takes into account the collision energy absorption; the middle part is made of sheet material with high structural strength, such as high-strength steel sheet, so as to significantly improve the overall torsional stiffness and extrusion strength of the lower box body. On this basis, two profiled reinforcing plates are laser welded on the outside or inside of the front and rear box body parts, the reinforcing plates are arranged with an area layout of "larger in front and smaller in rear" according to the ground clearance difference of the vehicle, and trapezoidal gradient reinforcing ribs and avoidance holes are arranged, which not only enhances the local stiffness of the reinforcing plate, but also avoids interference with the modules and pipelines, forming a "tough outside and hard inside" double defense line. This scheme can meet the bottom scraping test requirements without additional bottom protection plate, and the structure weight increase is also less than the traditional steel protection plate; at the same time, the expensive mold and hot pressing process of the composite material bottom protection plate are cancelled, the process manufacturing cost is significantly reduced, and the safety, light weight and cost of the three triangular balance are truly realized.

[0057] The present application will be described in detail below with reference to the drawings and embodiments.

[0058] Please refer to Figure 1 , Figure 1 The structural schematic diagram of the power utilization equipment provided by the present application.

[0059] In one embodiment, a power utilization equipment is provided, which comprises an electric device 100 and a battery device 200, and the battery device 200 is electrically connected with the electric device 100. The battery device 200 is used to provide electric energy for the power utilization equipment, so that the electric device 100 can work.

[0060] The power utilization equipment can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or an extended range automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0061] The following embodiments are described by taking the power utilization equipment as a vehicle for example for convenience of description.

[0062] The electric device 100 can be an element or device capable of using electricity; the electric device 100 can be a controller and an electronic element, etc., and the controller can be a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc.

[0063] In some examples, the electric device can be a vehicle, and the embodiments of the present application are all taken as an example. The electric device 100 can be a lamp (such as a headlight, a taillight, etc.), a display screen, an instrument panel, a control system (such as a controller), etc. of the vehicle. The vehicle can also include a vehicle frame, and the battery device 200 and the electric device 100 are both mounted on the vehicle frame.

[0064] Please refer to Figure 2 , Figure 2 The structural diagram of the battery device provided by an embodiment of the present application.

[0065] In the embodiment, a battery device 200 is provided, which includes a battery assembly 10 and a lower box body 20; the lower box body 20 includes a first box body part 21 and a second box body part 22; the battery assembly 10 is arranged on the first box body part 21; the second box body part 22 is connected to the first side of the first box body part 21 along a first direction X perpendicular to the height direction Z of the lower box body 20, and the structural strength of the second box body part 22 is less than that of the first box body part 21.

[0066] The battery assembly 10 includes a plurality of battery monomers. The plurality of battery monomers can form a battery assembly 10 through series connection, parallel connection or mixed connection. In other embodiments, the plurality of battery monomers can be first connected in series, in parallel or in mixed connection, and then arranged and fixed to form a battery assembly 10. In still other embodiments, the plurality of battery monomers can be first connected in series, in parallel or in mixed connection, and then arranged and fixed to form a plurality of assemblies, and the plurality of assemblies are connected in series, in parallel or in mixed connection to form an integral whole.

[0067] As an example, the plurality of battery monomers can be fixed to form the battery assembly 10 by a cable tie or the like. As an example, the plurality of battery monomers can also be fixed to form the battery assembly 10 by an end plate, a side plate or the like.

[0068] The battery monomer referred to in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. The battery monomer can be a secondary battery or a primary battery. The battery monomer can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery. The battery monomer can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0069] The battery cell can include a housing, an electrode assembly, and other functional components. The housing includes a cap and a bottom case. The cap refers to a component that covers the opening of the bottom case to isolate the internal environment of the battery cell from the external environment. Without limitation, the shape of the cap can be adapted to the shape of the bottom case to fit the bottom case. Alternatively, the cap can be made of a material with a certain hardness and strength, such as an aluminum alloy, so that the cap is less likely to deform when subjected to a crushing impact, enabling the battery cell to have higher structural strength and improved safety performance.

[0070] The cap can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly for outputting or inputting the electrical energy of the battery cell. In some embodiments, the electrode terminals can include a pole. The pole can include a positive pole and a negative pole for the output of current and connection with an external circuit. In some embodiments, the cap can also be provided with a pressure relief device for releasing the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value. The material of the cap can also be various, such as the material of the cap including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member can also be provided on the inner side of the cap. The insulating member can be used to isolate the electrical connection components in the bottom case from the cap to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc. The bottom case is a component used to fit the cap to form the internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte, and other components. The bottom case and the cap can be independent components, and an opening can be provided on the bottom case, and the cap is covered on the opening to form the internal environment of the battery cell. Without limitation, the cap and the bottom case can also be integrated, specifically, the cap and the bottom case can form a common connecting surface before other components are put into the case, and then the cap is covered on the bottom case when the internal part of the bottom case needs to be encapsulated. The bottom case can be various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the bottom case can be determined according to the specific shape and size of the electrode assembly. The material of the bottom case can be various, such as the material of the bottom case including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The electrode assembly is a component in which electrochemical reactions occur in the battery cell. One or more electrode assemblies can be contained in the bottom case. The electrode assembly is mainly formed by winding or stacking a positive sheet and a negative sheet, and an insulating member is usually provided between the positive sheet and the negative sheet. The positive sheet and the negative sheet have a portion of active material constituting the main body of the electrode assembly, and the portion of the positive sheet and the negative sheet without active material each constitutes a tab. The positive tab and the negative tab can be located together at one end of the main body or at two ends of the main body, respectively. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.

[0071] The lower box body 20 is formed with a receiving groove, and the battery assembly 10 is arranged in the receiving groove. In some examples, the battery device 200 further comprises an upper box body connected with the lower box body 20 and fastened to form a closed cavity structure, and the battery assembly 10 is arranged in the cavity structure to protect the battery assembly 10. The upper box body can be in the form of a plate or a basin.

[0072] The second box body part 22 can be welded to one side of the first box body part 21. When the battery device 200 is applied to an electric device, such as a vehicle, the second box body part 22 is located on the side of the first box body part 21 facing the front end of the vehicle, i.e., the end where the front of the vehicle is located.

[0073] The structural strength refers to the ability of a material or component to resist damage (such as fracture or deformation) under stress, and the influencing factors can be divided into three categories: material properties, geometric and design factors, and external environmental and load conditions. In one example, the material of the first box body part 21 can be high-strength steel. For example, the first box body part 21 is formed by stamping a steel plate. The material of the second box body part 22 can be low-carbon steel with low yield strength but good ductility. For example, the second box body part 22 is formed by stamping a low-carbon steel plate.

[0074] In this embodiment, by using a plate material with high structural strength for the first box body part 21 of the lower box body 20 for carrying the battery assembly 10, the torsional stiffness and extrusion strength of the lower box body 20 can be improved to well support the battery assembly 10; while the second box body part 22 uses a plate material with low structural strength. In this way, not only can the lower box body 20 protect the bottom of the battery device 200, but also the overall mass of the lower box body 20 is lighter compared to using a plate material with high structural strength throughout the lower box body 20; and compared to a composite material guard plate, there is no need to use expensive guard plate molds and hot pressing processes, and the process manufacturing cost is significantly reduced; so that the battery device 200 can balance light weight and low manufacturing cost.

[0075] Referring to Figures 3 to 5 , Figure 3 a structural diagram of a battery device 200 provided by another embodiment of the present application; Figure 4 a structural diagram of a lower box body 20 provided by an embodiment of the present application; Figure 5 a disassembled diagram of a first box body part 21, a second box body part 22, and a third box body part 23 provided by an embodiment of the present application.

[0076] In one embodiment, the lower box body 20 further comprises a third box body part 23 connected to the second side of the first box body part 21 along the first direction X, and the structural strength of the third box body part 23 is less than that of the first box body part 21.

[0077] The third box portion 23 can be welded to the second side of the first box portion 21. When the battery device 200 is applied to an electric device, such as a vehicle, the third box portion 23 is located at the side of the first box portion 21 facing the rear end of the vehicle, i.e., the end where the tail of the vehicle is located.

[0078] As an example, in combination with Figure 5 , the first box portion 21 includes a first bottom plate 211 and two first side walls 212 connected to the first bottom plate 211. The battery assembly 10 is arranged on the first bottom plate 211. The two first side walls 212 are oppositely arranged on the two side edges of the first bottom plate 211 along the second direction Y and are located on the two sides of the battery assembly 10 along the second direction Y. The second direction Y is perpendicular to the first direction X and the height direction Z of the lower box 20, respectively.

[0079] As an example, in combination with Figure 4 and Figure 5 , the second box portion 22 can include a second bottom plate 221 and a second side wall 222. The second bottom plate 221 has a first side edge facing the first bottom plate 211, and the first side edge of the second bottom plate 221 is connected, such as welded, to the first side of the first bottom plate 211. The second side wall 222 is connected to the other edges of the second bottom plate 221 except the first side edge and is connected to the side edges of the first box portion 21 facing the second box portion 22.

[0080] As an example, the third box portion 23 can include a third bottom plate 231 and a third side wall 232. The third bottom plate 231 has a first side edge facing the first bottom plate 211, and the first side edge of the third bottom plate 231 is connected, such as welded, to the second side of the first bottom plate 211. The third side wall 232 is connected to the other edges of the third bottom plate 231 except the first side edge and is connected to the side edges of the first box portion 21 facing the third box portion 23. Among them, the first side wall 212, the second side wall 222, and the third side wall 232 enclose a hollow cavity. At least part of the battery assembly 10 is arranged in the hollow cavity.

[0081] In this embodiment, by making the lower box 20 include the first box portion 21 and the second box portion 22 and the third box portion 23 located on the two sides of the first box portion 21, the battery assembly 10 can be located at the central position or the position close to the central position of the lower box 20, the stress of the lower box 20 is more uniform, and the overall balance of the battery device 200 is better; and the risk of damage to the battery assembly 10 caused by shaking or displacement can be reduced.

[0082] Referring to Figure 6 , Figure 6 the exploded view of the lower box 20 shown in Figure 4 .

[0083] In one embodiment, the second box portion 22 comprises a second bottom plate 221; the third box portion 23 comprises a third bottom plate 231; the lower box 20 further comprises a first reinforcing plate 24, the first reinforcing plate 24 is arranged at least on the second bottom plate 221, and the structural strength of the first reinforcing plate 24 is greater than the structural strength of the second box portion 22; and / or the lower box 20 further comprises a second reinforcing plate 25, the second reinforcing plate 25 is arranged at least on the third bottom plate 231, and the structural strength of the second reinforcing plate 25 is greater than the structural strength of the third box portion 23.

[0084] In one example, the lower box 20 comprises the first reinforcing plate 24; but does not comprise the second reinforcing plate 25. In another example, the lower box 20 comprises the second reinforcing plate 25; but does not comprise the first reinforcing plate 24. In yet another example, the lower box 20 comprises both the first reinforcing plate 24 and the second reinforcing plate 25.

[0085] In one example, the first reinforcing plate 24 is arranged on the side (i.e. the inner side) of the second box portion 22 facing the battery assembly 10. The second reinforcing plate 25 is arranged on the side of the third box portion 23 facing the battery assembly 10. In another example, one of the first reinforcing plate 24 and the second reinforcing plate 25 is arranged on the side (i.e. the inner side) of the lower box 20 facing the battery assembly 10, and the other is arranged on the side (i.e. the outer side) of the lower box 20 away from the battery assembly 10. In yet another example, the first reinforcing plate 24 is arranged on the side of the second box portion 22 away from the battery assembly 10; and the second reinforcing plate 25 is arranged on the side of the third box portion 23 away from the battery assembly 10.

[0086] In this example, the reinforcing plates can be flexibly arranged on the inner side or the outer side of the lower box 20, and can leave space for different chassis arrangements of different vehicle models.

[0087] The first reinforcing plate 24 and the second box portion 22 can be connected by laser welding to improve the connection reliability and increase the structural strength of the lower box 20 at the corresponding position. Similarly, the second reinforcing plate 25 and the third box portion 23 can also be connected by laser welding to improve the connection reliability and increase the structural strength of the lower box 20 at the corresponding position. Of course, in other examples, the first reinforcing plate 24 and the second reinforcing plate 25 can be connected to the corresponding box portion by a fixing member or a buckle, etc.

[0088] The structural strength of the first reinforcing plate 24 and / or the second reinforcing plate 25 can be the same as that of the first box portion 21, and the first reinforcing plate 24 and / or the second reinforcing plate 25 can be made of the same plate material as the first box portion 21. For example, the first reinforcing plate 24 and / or the second reinforcing plate 25 can be a high-strength steel reinforcing plate.

[0089] Of course, the structural strength of the first reinforcing plate 24 and / or the second reinforcing plate 25 can also be less than or greater than the structural strength of the first box portion 21.

[0090] In this embodiment, by providing the first reinforcing plate 24 on the second box portion 22 and / or the second reinforcing plate 25 on the third box portion 23, a double defense line of "tough outside and hard inside" is formed at the positions of the second box portion 22 and the third box portion 23. This scheme can meet the requirements of the bottom anti-collision test of the battery device 200 without additional bottom guards, and the structural weight of the battery device 200 is also less than that of the traditional steel guard; at the same time, the expensive mold and hot pressing process of the composite material bottom guard are cancelled, and the process manufacturing cost is significantly reduced, truly realizing the triangular balance of safety, light weight and cost. Moreover, compared with the scheme of using a plate material with higher structural strength for the entire lower box 20, the strength of the second box portion 22 and / or the third box portion 23 can be improved while saving the use of expensive materials and reducing the process manufacturing cost.

[0091] Referring to Figures 7 to 9 , Figure 7 a schematic diagram of the overall structure of the first reinforcing plate 24 provided in an embodiment of the present application; Figure 8 for Figure 7 an enlarged view of position A in the structure shown; Figure 9 a schematic diagram of the structure of the second reinforcing plate 25 provided in an embodiment of the present application.

[0092] In one embodiment, the first reinforcing plate 24 is provided with first reinforcing ribs 241; and / or the second reinforcing plate 25 is provided with second reinforcing ribs 251.

[0093] In one example, the first reinforcing plate 24 is provided with first reinforcing ribs 241; and the second reinforcing plate 25 is provided with second reinforcing ribs 251. In another example, one of the first reinforcing plate 24 and the second reinforcing plate 25 is provided with reinforcing ribs, and the other is not provided with reinforcing ribs.

[0094] The number of first reinforcing ribs 241 can be multiple, and multiple first reinforcing ribs 241 are arranged at intervals on the first reinforcing plate 24. For example, multiple first reinforcing ribs 241 are uniformly distributed on the first reinforcing plate 24. The number of second reinforcing ribs 251 can be multiple, and multiple second reinforcing ribs 251 are arranged at intervals on the second reinforcing plate 25. For example, multiple second reinforcing ribs 251 are uniformly distributed on the second reinforcing plate 25.

[0095] In some examples, the first reinforcing rib 241 can be arranged at a main stress point of the first reinforcing plate 24; for example, the first reinforcing rib 241 is arranged at a position of the lower box body 20 which is prone to being impacted or scratched. The second reinforcing rib 251 can be arranged at a main stress point of the second reinforcing plate 25; for example, the second reinforcing rib 251 is arranged at a position of the lower box body 20 which is prone to being impacted or scratched.

[0096] In one example, the first reinforcing rib 241 and / or the second reinforcing rib 251 protrudes towards a side where the battery assembly 10 is located.

[0097] The first reinforcing rib 241 and / or the second reinforcing rib 251 is in a strip shape.

[0098] In the present embodiment, by arranging the first reinforcing rib 241 on the first reinforcing plate 24, the local strength or rigidity of the first reinforcing plate 24 can be improved. By arranging the second reinforcing rib 251 on the second reinforcing plate 25, the local strength or rigidity of the second reinforcing plate 25 can be improved.

[0099] Referring to Figure 8 In one embodiment, the first reinforcing rib 241 is formed by stamping the first reinforcing plate 24; and / or the second reinforcing rib 251 is formed by stamping the second reinforcing plate 25.

[0100] In one example, the first reinforcing rib 241 and the second reinforcing rib 251 are both formed by stamping the corresponding reinforcing plate. In another example, one of the first reinforcing rib 241 and the second reinforcing rib 251 is formed by stamping the corresponding reinforcing plate.

[0101] In some examples, a trapezoidal reinforcing rib with a gradually changing height can be stamped on the main stress point of the first reinforcing plate 24 and / or the second reinforcing plate 25 to improve the local rigidity.

[0102] In the present embodiment, by forming the first reinforcing rib 241 and / or the second reinforcing rib 251 by stamping the corresponding reinforcing plate, compared with the scheme of directly adding reinforcing ribs on the reinforcing plate, the local high strength of the reinforcing plate can be achieved without increasing the thickness of the reinforcing plate.

[0103] In one embodiment, referring to Figure 8 The cross section of the first reinforcing rib 241 along the height direction Z of the lower box body 20 has a width gradually decreasing in a direction away from the second bottom plate 221; and / or the cross section of the second reinforcing rib 251 along the height direction Z of the lower box body 20 has a width gradually decreasing in a direction away from the third bottom plate 231.

[0104] Here, the width refers to the dimension along the second direction Y.

[0105] In one example, the cross section of the first reinforcing rib 241 along the height direction Z of the lower case 20 has a width gradually decreasing in a direction away from the second bottom plate 221 (i.e. in a direction towards the side where the battery assembly 10 is located). In another example, the cross section of the second reinforcing rib 251 along the height direction Z of the lower case 20 has a width gradually decreasing in a direction away from the third bottom plate 231. In yet another example, the cross section of the first reinforcing rib 241 along the height direction Z of the lower case 20 has a width gradually decreasing in a direction away from the second bottom plate 221; and the cross section of the second reinforcing rib 251 along the height direction Z of the lower case 20 has a width gradually decreasing in a direction away from the third bottom plate 231.

[0106] For example, the cross section of the first reinforcing rib 241 and / or the second reinforcing rib 251 along the height direction Z of the lower case 20 can be trapezoidal; for example, isosceles trapezoidal.

[0107] In the present embodiment, by making the cross section of the first reinforcing rib 241 along the height direction Z of the lower case 20 have a width gradually decreasing in a direction away from the second bottom plate 221, the local structural strength of the first reinforcing plate 24 can be further improved. By making the cross section of the second reinforcing rib 251 along the height direction Z of the lower case 20 have a width gradually decreasing in a direction away from the third bottom plate 231, the local structural strength of the second reinforcing plate 25 can be further improved.

[0108] In one embodiment, referring to Figure 6 and Figure 8 the number of the first reinforcing ribs 241 is multiple, and at least part of the first reinforcing ribs 241 extend along the first direction X; and / or the number of the second reinforcing ribs 251 is multiple, and at least part of the second reinforcing ribs 251 extend along the first direction X.

[0109] In the case that the battery device 200 is used in a vehicle, the first direction X can be a direction from the rear of the vehicle towards the front of the vehicle, i.e. the main load bearing direction of the vehicle.

[0110] In one example, the number of the first reinforcing ribs 241 is multiple, and at least part of the first reinforcing ribs 241 extend along the first direction X; and the number of the second reinforcing ribs 251 is multiple, and at least part of the second reinforcing ribs 251 extend along the first direction X. In another example, the number of the first reinforcing ribs 241 is multiple, and at least part of the first reinforcing ribs 241 extend along the first direction X. Or the number of the second reinforcing ribs 251 is multiple, and at least part of the second reinforcing ribs 251 extend along the first direction X.

[0111] In one example, referring to Figure 8, all the first reinforcing ribs 241 extend along the first direction X, and part of the first reinforcing ribs 241 extend along the second direction Y. All the second reinforcing ribs 251 extend along the first direction X, and part of the second reinforcing ribs 251 extend along the second direction Y.

[0112] Of course, in other examples, all the first reinforcing ribs 241 can extend along the first direction X, and are arranged at equal intervals along the second direction Y. All the second reinforcing ribs 251 extend along the first direction X, and are arranged at equal intervals along the second direction Y.

[0113] In the embodiment, by arranging at least part of the first reinforcing ribs 241 to extend along the first direction X, and / or at least part of the second reinforcing ribs 251 to extend along the first direction X, the first reinforcing ribs 241 and / or the second reinforcing ribs 251 are arranged continuously along the main load-bearing path of the electrical equipment, so that the load-bearing capacity of the lower box body 20 along the main load-bearing direction can be effectively improved.

[0114] In one embodiment, referring to Figure 7 and Figure 9 , the second box body portion 22 is provided with a first structural member on the side facing the battery assembly 10; the first reinforcing plate 24 is provided with a first avoiding hole 242 corresponding to the position of the first structural member; and / or the third box body portion 23 is provided with a second structural member on the side facing the battery assembly 10; the second reinforcing plate 25 is provided with a second avoiding hole 252 corresponding to the position of the second structural member.

[0115] In one example, the second box body portion 22 is provided with a first structural member on the side facing the battery assembly 10; the first reinforcing plate 24 is provided with a first avoiding hole 242 corresponding to the position of the first structural member; and the third box body portion 23 is provided with a second structural member on the side facing the battery assembly 10; the second reinforcing plate 25 is provided with a second avoiding hole 252 corresponding to the position of the second structural member.

[0116] In another example, the second box body portion 22 is provided with a first structural member on the side facing the battery assembly 10; the first reinforcing plate 24 is provided with a first avoiding hole 242 corresponding to the position of the first structural member. Alternatively, the third box body portion 23 is provided with a second structural member on the side facing the battery assembly 10; the second reinforcing plate 25 is provided with a second avoiding hole 252 corresponding to the position of the second structural member.

[0117] The first structural member and / or the second structural member can be a module, a pipeline, a wire harness, a drain valve, etc.

[0118] The contour of the first avoiding hole 242 can match the contour of the first structural member, so as to improve the overall sealing of the lower box body 20 while avoiding the first structural member. The contour of the second avoiding hole 252 can match the contour of the second structural member, so as to further improve the overall sealing of the lower box body 20 while avoiding the second structural member.

[0119] In the embodiment, the first avoiding hole 242 is arranged on the first reinforcing plate 24 corresponding to the position of the first structural member, and the second avoiding hole 252 is arranged on the second reinforcing plate 25 corresponding to the position of the second structural member. In this way, the interference of the first reinforcing plate 24 and / or the second reinforcing plate 25 with the structural member on the lower box body 20 can be reduced, and the mass of the first reinforcing plate 24 and / or the second reinforcing plate 25 can be reduced, so as to achieve the weight reduction effect. It is calculated that the reinforcing plate scheme reduces the weight of the traditional whole-plate steel guard plate by about 70%, and reduces the cost of the composite material guard plate by about 40%, which not only meets the protection requirement but also reduces the cost.

[0120] In one embodiment, reference can be made back to Figures 4 to 6 The second box body part 22 is configured to be arranged towards the front end of the electrical equipment; and the first reinforcing plate 24 covers at least the entire second bottom plate 221.

[0121] The front end of the electrical equipment is the end where the vehicle head is located.

[0122] In one example, the first reinforcing plate 24 further covers part of the second side wall 222, so as to enhance the overall strength of the lower box body 20 corresponding to the position of the second box body part 22. For example, the first reinforcing plate 24 is arranged corresponding to the connection between the second bottom plate 221 and the second side wall 222, and matches the contour of the connection between the second bottom plate 221 and the second side wall 222, so as to improve the fit of the first reinforcing plate 24 and the second box body part 22, thereby further improving the strength of the structure formed by the two.

[0123] In one example, the area of the first reinforcing plate 24 is greater than the area of the second reinforcing plate 25.

[0124] In the embodiment, when the battery device 200 is used for a vehicle, the front end chassis of the vehicle is lower than the rear end chassis, that is, the front end chassis of the vehicle is closer to the ground, and is more likely to be hit or scratched by foreign matters such as gravel and flanges, that is, the second box body part 22 is more likely to be impacted and expanded. The scheme uses a reinforcing plate with a larger area to reinforce and protect the second box body part 22, which can diffuse the shock wave in the first time and reduce the local pressure of the second box body part 22, thereby protecting the bottom of the battery device 200.

[0125] In one embodiment, reference can be made back to Figure 4 The second reinforcing plate 25 covers part of the third bottom plate 231.

[0126] In the embodiment, the third box portion 23 is arranged at the rear end of the electrical equipment, i.e., the end where the tail of the vehicle is located. The distance between the third box portion 23 and the ground is large, and the probability of the third box portion 23 being impacted or collided is small. The scheme can improve the structural strength to meet the protection requirements by covering part of the third bottom plate 231 with the second reinforcing plate 25, and can reduce the overall weight of the lower box 20 as much as possible, reduce the risk of redundant mass, and reduce the interference of the reinforcing plate to other structural members in the lower box 20.

[0127] In one embodiment, referring to Figure 6 and Figure 9 , the third box portion 23 further includes a third side wall 232 connected to the third bottom plate 231; the second reinforcing plate 25 is arranged at the connection position of the third bottom plate 231 and the third side wall 232; and the second reinforcing plate 25 includes a first plate portion 253 and a second plate portion 254 connected in sequence, the first plate portion 253 is arranged on the third bottom plate 231, and the second plate portion 254 is arranged on the third side wall 232.

[0128] In combination Figure 4 , the first plate portion 253 covers part of the third bottom plate 231 away from the first box portion 21. The second plate portion 254 covers part of the third side wall 232. Both the first plate portion 253 and the second plate portion 254 are plate-shaped.

[0129] In the embodiment, by arranging the second reinforcing plate 25 on the third bottom plate 231 and the third side wall 232 of the third box portion 23 respectively, the connection strength of the corner of the third box portion 23 can be enhanced, and the second reinforcing plate 25 is arranged at the corner of the third box portion 23, which is simple in arrangement and has little interference with other structural members in the lower box 20.

[0130] In one embodiment, the profile of the side surface of the first reinforcing plate 24 facing the second box portion 22 matches the profile of the side surface of the second box portion 22 facing the first reinforcing plate 24; and / or, the profile of the side surface of the second reinforcing plate 25 facing the third box portion 23 matches the profile of the side surface of the third box portion 23 facing the second reinforcing plate 25.

[0131] In combination, the profile of the side surface of the first reinforcing plate 24 facing the second box portion 22 matches the profile of the side surface of the second box portion 22 facing the first reinforcing plate 24, including that the part of the first reinforcing plate 24 covering the second bottom plate 221 matches the surface profile of the second bottom plate 221, the part of the first reinforcing plate 24 covering the second side wall 222 matches the surface profile of the second side wall 222, and the part of the first reinforcing plate 24 corresponding to the connection corner of the second bottom plate 221 and the second side wall 222 matches the profile of the connection corner of the second bottom plate 221 and the second side wall 222.

[0132] The profile of the side surface of the second reinforcing plate 25 facing the third box portion 23 matches the profile of the side surface of the third box portion 23 facing the second reinforcing plate 25, including that the portion of the second reinforcing plate 25 covering the third bottom plate 231 matches the surface profile of the third bottom plate 231, the portion of the second reinforcing plate 25 covering the third side wall 232 matches the surface profile of the third side wall 232, and the portion of the second reinforcing plate 25 corresponding to the connecting corner of the third bottom plate 231 and the third side wall 232 matches the profile of the connecting corner of the third bottom plate 231 and the third side wall 232.

[0133] In one example, the profile of the side surface of the first reinforcing plate 24 facing the second box portion 22 matches the profile of the side surface of the second box portion 22 facing the first reinforcing plate 24, and the profile of the side surface of the second reinforcing plate 25 facing the third box portion 23 matches the profile of the side surface of the third box portion 23 facing the second reinforcing plate 25.

[0134] In another example, the profile of the side surface of the first reinforcing plate 24 facing the second box portion 22 matches the profile of the side surface of the second box portion 22 facing the first reinforcing plate 24, or the profile of the side surface of the second reinforcing plate 25 facing the third box portion 23 matches the profile of the side surface of the third box portion 23 facing the second reinforcing plate 25.

[0135] In the present embodiment, by matching the surface profile of the reinforcing plate with the corresponding box portion, the reinforcing plate and the corresponding box portion can be more closely fitted, thereby improving the structural strength of the overall lower box 20.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and 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 replacements for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a battery assembly; a lower case comprising a first case portion and a second case portion; the battery assembly is arranged on the first case portion; the second case portion is connected to a first side of the first case portion in a first direction perpendicular to a height direction of the lower case, and the structural strength of the second case portion is less than that of the first case portion.

2. The battery device according to claim 1, wherein the lower case further comprises a third case portion connected to a second side of the first case portion in the first direction, and the structural strength of the third case portion is less than that of the first case portion.

3. The battery device according to claim 2, wherein the second case portion comprises a second bottom plate; the third case portion comprises a third bottom plate; the lower case further comprises a first reinforcing plate arranged on at least the second bottom plate, and the structural strength of the first reinforcing plate is greater than that of the second case portion; and / or the lower case further comprises a second reinforcing plate arranged on at least the third bottom plate, and the structural strength of the second reinforcing plate is greater than that of the third case portion.

4. The battery device according to claim 3, wherein the first reinforcing plate is provided with first reinforcing ribs; and / or the second reinforcing plate is provided with second reinforcing ribs.

5. The battery device according to claim 4, wherein the first reinforcing ribs are formed by stamping the first reinforcing plate; and / or the second reinforcing ribs are formed by stamping the second reinforcing plate.

6. The battery device according to claim 5, wherein in a cross section of the first reinforcing ribs in the height direction of the lower case, the width gradually decreases in a direction away from the second bottom plate; and / or in a cross section of the second reinforcing ribs in the height direction of the lower case, the width gradually decreases in a direction away from the third bottom plate.

7. The battery device according to claim 4, wherein the number of the first reinforcing ribs is multiple, and at least part of the first reinforcing ribs extend in the first direction; and / or the number of the second reinforcing ribs is multiple, and at least part of the second reinforcing ribs extend in the first direction.

8. The battery device according to claim 3, wherein one side of the second case portion facing the battery assembly is provided with a first structural member; the first reinforcing plate is provided with a first avoiding hole corresponding to the position of the first structural member; and / or one side of the third case portion facing the battery assembly is provided with a second structural member; the second reinforcing plate is provided with a second avoiding hole corresponding to the position of the second structural member.

9. The battery device according to claim 3, wherein the second case portion is configured to be arranged towards the front end of the power consumption device; and the first reinforcing plate covers at least the entire second bottom plate.

10. The battery device according to claim 9, wherein the second reinforcing plate covers part of the third bottom plate.

11. The battery device according to claim 10, wherein The third box part further comprises a third side wall connected to the third bottom plate; The second reinforcing plate is arranged at a connection between the third bottom plate and the third side wall, and the second reinforcing plate comprises a first plate part and a second plate part connected in sequence, the first plate part being arranged on the third bottom plate, and the second plate part being arranged on the third side wall.

12. The battery device according to claim 3, wherein A profile of a side surface of the first reinforcing plate toward the second box part matches a profile of a side surface of the second box part toward the first reinforcing plate; and / or A profile of a side surface of the second reinforcing plate toward the third box part matches a profile of a side surface of the third box part toward the second reinforcing plate.

13. An electrical device, characterized by A battery device comprising any one of the features of claims 1-12.

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