Box cover, battery device and electric equipment

Abstract

The utility model discloses a box cover, a battery device and electric equipment, and relates to the technical field of batteries, the battery device comprises a battery box body and a battery cell, the battery box body comprises a box shell and a box cover, the box cover covers the box shell, an accommodating space is defined by the box cover and the box shell, the battery cell is accommodated in the accommodating space, the box cover comprises a surface layer and a shielding layer which are arranged in a stacked mode, and the shielding layer is arranged between the surface layer and the shielding layer. The surface part of the shielding layer is exposed, and the exposed surface of the shielding layer is conductively connected with the box shell through a conductive piece; thickening layers are arranged at the corners of the box cover. The problem that flux leakage is prone to occurring at the connecting position between the box cover and the box shell can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a box cover, a battery device and an electric equipment. BACKGROUND

[0002] In the related art, the box cover of the battery box is usually provided with a shielding layer to shield electromagnetic interference. The shielding layer is usually made of aluminum foil or radiation-proof cloth. The connection position between the box cover and the box shell is prone to magnetic leakage risk. UTILITY MODEL CONTENT

[0003] In view of the above problems, the present application provides a box cover, a battery device and an electric equipment, aiming to improve the problem that the connection position between the box cover and the box shell is prone to magnetic leakage.

[0004] The present application provides a battery device, comprising a battery box and a battery cell. The battery box comprises a box shell and a box cover. The box cover is arranged on the box shell and forms an accommodation space together with the box shell. The battery cell is accommodated in the accommodation space. The box cover comprises a surface layer and a shielding layer arranged in layers. A surface part of the shielding layer is exposed. The exposed surface of the shielding layer is electrically connected to the box shell through a conductive member. The corner part of the box cover is provided with a thickening layer.

[0005] In the technical scheme of the present application, the surface part of the shielding layer of the box cover is exposed, so that the shielding layer is electrically connected to the box shell through a conductive member. An electromagnetic shielding channel is formed between the box cover and the box shell, which can reduce the risk of electromagnetic signal leakage from the flange of the box cover, thereby effectively improving the problem of magnetic leakage at the connection between the box cover and the box shell. In addition, during the molding process, the corner part of the box cover is prone to accumulate wrinkles during mold pressing, so the excess material needs to be trimmed to facilitate layering. Therefore, the present application additionally increases a small material layer at the corner position of the corner part of the box cover to form a thickening layer, which can improve the overall strength of the corner position.

[0006] In some embodiments, the box cover comprises a box cover body and a box cover flange. The box cover body comprises an inner surface layer and a first shielding layer arranged in layers. The box cover flange is connected to the edge of the box cover body and is connected to the box shell. The box cover flange comprises a second shielding layer, and the inner surface of the second shielding layer is exposed. The surface layer comprises the inner surface layer, and the shielding layer comprises the first shielding layer and the second shielding layer. The first shielding layer is connected to the second shielding layer, and the second shielding layer is electrically connected to the box shell through a conductive member. Such a design exposes the inner surface of the second shielding layer of the box cover flange, so that the second shielding layer is electrically connected to the box shell through a conductive member. A shielding channel is formed between the box cover and the box shell to reduce the risk of electromagnetic signal leakage from the flange of the box cover, thereby effectively improving the problem of magnetic leakage at the connection between the box cover and the box shell. Moreover, the design of the box cover flange facilitates the realization of the electrical connection between the box cover and the box shell by the conductive member.

[0007] In some embodiments, the box cover flange is arranged around the edge of the box cover body, and the conductive part is arranged along the circumference of the box cover flange. Such a design, by arranging the box cover flange around the edge of the box cover body, forms a ring-shaped structure of the box cover flange, so as to connect the ring-shaped box cover flange with the box shell, which can increase the connection area between the box cover and the box shell, thereby improving the connection reliability between the box cover and the box shell. In addition, by arranging the conductive part along the circumference of the box cover flange, the conductive part also forms a ring-shaped peripheral structure. When the second shielding layer is conductively connected with the box shell through the conductive part, a more complete peripheral shielding channel can be formed between the box cover and the box shell to form a Faraday cage effect, thereby achieving a stronger electromagnetic shielding effect, so that the leakage of electromagnetic signals from the box cover flange can be better avoided.

[0008] In some embodiments, the box cover flange is connected with the end face of the box shell, and the conductive part is arranged between the box cover flange and the end face of the box shell. Such a design directly arranges the conductive part between the second shielding layer of the box cover flange and the end face of the box shell, so as to realize the conductive connection between the second shielding layer and the box shell through the conductive part. This design facilitates the installation of the conductive part.

[0009] In some embodiments, the conductive part is a conductive buffer. Such a design, when the box cover flange is connected to the end face of the box shell, uses the conductive buffer as the conductive part to realize the conductive connection between the second shielding layer and the box shell. Under the action of the gravity of the box cover, the conductive buffer can be squeezed to absorb the flatness tolerance of the second shielding layer or the flange face of the box shell, thereby improving the conductive connection reliability between the second shielding layer and the box shell.

[0010] In some embodiments, the box cover flange is connected with the box shell through a connecting piece. Such a design, by using the connecting piece to connect the box cover flange with the box shell, can improve the connection reliability between the box cover flange and the box shell.

[0011] In some embodiments, a sealing buffer pad is further arranged between the second shielding layer and the box shell. The sealing buffer pad is an insulating part and is arranged along the circumference of the box cover flange. The sealing buffer pad is sleeved on the connecting piece. Such a design can seal the connection between the second shielding layer and the box shell, i.e., seal the connection between the box cover and the box shell, so as to avoid the entry of impurities from the outside into the inside of the battery box body through the connection between the box cover and the box shell to pollute the battery cell.

[0012] In some embodiments, the conductive part is located outside the sealing buffer pad. Such a design can use the space remaining outside the sealing buffer pad to install the conductive part, without the need to additionally increase space to install the conductive part, thereby simplifying the structure design and preventing the conductive part from affecting the sealing effect of the sealing buffer pad.

[0013] In some embodiments, the box cover body further comprises a first outer layer arranged on the outer side surface of the first shielding layer away from the inner layer; the box cover flange further comprises a second outer layer arranged on the outer side surface of the second shielding layer; the first outer layer is connected with the second outer layer; and the outer layer comprises the first outer layer and the second outer layer. With such a design, the first shielding layer can be protected by the first outer layer arranged on the outer side surface of the first shielding layer, so as to avoid the influence of external factors such as light and salt spray on the electromagnetic shielding effect of the first shielding layer. Similarly, the second shielding layer can be protected by the second outer layer arranged on the outer side surface of the second shielding layer, so as to avoid the influence of external factors such as light and salt spray on the electromagnetic shielding effect of the second shielding layer.

[0014] In some embodiments, the thickness of the second outer layer is greater than the thickness of the first outer layer. With such a design, since the inner layer does not need to be laid on the inner side surface of the second shielding layer of the box cover flange, in order to make the box cover flange have sufficient rigidity, the thickness of the second outer layer is greater than the thickness of the first outer layer in this embodiment.

[0015] In some embodiments, the box cover body comprises a box cover top plate and a box cover side plate; the box cover top plate comprises a top inner layer, a top shielding layer and a top outer layer arranged in sequence; the box cover side plate comprises a side inner layer, a side shielding layer and a side outer layer arranged in sequence, and the box cover side plate is arranged at an angle with the box cover top plate and the box cover flange; the top inner layer is connected with the side inner layer and constitutes the inner layer; the top shielding layer is connected with the side shielding layer and constitutes the first shielding layer; the side shielding layer is connected with the second shielding layer; the top outer layer is connected with the side outer layer and constitutes the first outer layer; and the side outer layer is connected with the second outer layer. With such a design, the box cover top plate and the box cover side plate of the box cover body can form a box cover similar to a π type with the box cover flange, so as to form a hollow structure with one side open, so that the box cover and the box shell can jointly define a larger accommodation space, and the box cover body of this design is not prone to deformation, which can improve the anti-deformation effect of the box cover.

[0016] The application further provides a box cover comprising layers of layers and shielding layers arranged in layers, and the surface of the shielding layer is partially exposed; the exposed surface of the shielding layer is configured to be conductively connected with a box shell through a conductive member; and the corner of the box cover is provided with a thickened layer.

[0017] The application further provides a power consumption device comprising the above-mentioned battery device.

[0018] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application will be described. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to the structures shown in these drawings without creative labor.

[0020] Figure 1 Structure schematic diagram of an embodiment of the vehicle of the present application;

[0021] Figure 2 Exploded view of an embodiment of the battery device of the present application;

[0022] Figure 3 Exploded view of an embodiment of the box cover of the present application;

[0023] Figure 4 Sectional view of an embodiment of the box cover of the present application;

[0024] Figure 5 Exploded view of an embodiment of the battery box of the present application;

[0025] Figure 6 Sectional view of an embodiment of the battery box of the present application.

[0026] Explanation of reference numerals:

[0027]

[0028] The implementation of the purpose of the present application, functional features and advantages will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0029] 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.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and "with" in the specification and claims, along with their derivatives, are meant to be interpreted as specifying inclusion of the referenced elements, but not exclusion of any other elements.

[0031] 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.

[0032] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification is not necessarily all referring to the same embodiment, or to a particular embodiment, or to a particular set of embodiments, and is not intended to exclude any other embodiments or aspects of the application. It will be explicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] In the description of the embodiments of the present 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).

[0034] In the description of the embodiments of the present 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 present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application, which do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0035] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", and the like should be understood in a broad sense, 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 communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] Battery devices referred to in the art are also called batteries, which can be classified into primary batteries and secondary batteries according to whether they can be recharged. Currently, the common types of secondary batteries include lead-acid batteries, nickel-hydrogen batteries and lithium-ion batteries. Lithium-ion batteries are currently widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for such purposes is relatively low, but they have a larger output, a longer service life and a higher cost.

[0037] The batteries described in the embodiments of the present application refer to secondary batteries. In the following, the embodiments disclosed in the present application will be mainly described by taking lithium-ion batteries as an example. It should be understood that the embodiments disclosed in the present application are applicable to any other appropriate type of secondary batteries. The batteries referred to in the embodiments disclosed in the present application can be directly or indirectly applied to appropriate devices to power the devices.

[0038] The batteries referred to in the embodiments disclosed in the present application refer to single physical modules including one or more battery cells to provide a predetermined voltage and capacity. The battery cell is the basic unit in a battery, which can be generally classified into cylindrical battery cells, cuboid battery cells and soft-pack battery cells according to the packaging manner. In the following, the embodiments will be mainly described around the cuboid battery cells. It should be understood that the embodiments described in the following are also applicable to the cylindrical battery cells or the soft-pack battery cells in some aspects.

[0039] The battery cell includes a positive electrode tab, a negative electrode tab, an electrolyte and a separator. The lithium-ion battery cell mainly relies on the movement of lithium ions between the positive electrode tab and the negative electrode tab to work. In the cylindrical battery cell, the thin film structure of the three layers is wound into a cylindrical electrode assembly, while in the cuboid battery cell, the thin film structure is wound or stacked into an electrode assembly having a substantially cuboid shape.

[0040] In a general battery cell structure, the battery cell includes a housing, an electrode assembly and an electrolyte. The electrode assembly is accommodated in the housing of the battery cell, and the electrode assembly includes a positive electrode tab, a negative electrode tab and a separator. The battery case includes a bottom shell and a cover. The bottom shell includes an accommodation cavity formed by a plurality of walls and an opening. The cover is arranged at the opening to close the accommodation cavity. In addition to the electrode assembly, the accommodation cavity also accommodates the electrolyte. The positive electrode tab and the negative electrode tab in the electrode assembly include tabs. In order to avoid fusing caused by a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The tabs are electrically connected to electrode terminals located outside the battery cell through connecting members. The electrode terminals generally include a positive electrode terminal and a negative electrode terminal. For the cuboid battery cell, the electrode terminals are generally arranged in the cover part. A plurality of battery cells are connected in series and / or parallel together through the electrode terminals to be applied to various application occasions.

[0041] In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cell, battery module and battery. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system installed in the electric vehicle. The battery generally includes a battery box for packaging one or more battery cells.

[0042] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries play an irreplaceable important role as the power source of electric vehicles. The battery is composed of a battery box and a plurality of battery cells contained in the battery box. Among them, the battery as a core part of new energy vehicles has higher requirements in safety. At present, the mechanical safety of power batteries during use is one of the battery safety problems that consumers are generally concerned about.

[0043] The battery provided by the embodiments of the present application can be a power source for an electric device. The electric device can be a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric vehicle, a ship, a spacecraft, an electric toy and an electric tool, etc. For example, 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 vehicle toy, an electric ship toy and an electric plane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, such as a power drill, a power grinder, a power wrench, a power screwdriver, a power hammer, an impact drill, a concrete vibrator and a power planer.

[0044] The following embodiments are described for convenience with a vehicle 1000 as an example of an electric device of an embodiment of the present application.

[0045] For example, Figure 1As a schematic structural view of an embodiment of the vehicle 1000, the vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle. The vehicle 1000 can be internally provided with a battery device 100, a controller 200, and a motor 300, and the controller 200 can be used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000, and can be used for the circuit system of the vehicle 1000, for example, for the power demand of the vehicle 1000 during starting, navigation, and operation. In another embodiment of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0046] For example, refer to Figure 2 , Figure 2 As an exploded view of an embodiment of the battery device 100, the battery device 100 includes a battery box 10 and a battery cell 20, and the battery box 10 has a containing space for containing the battery cell 20. The battery box 10 can have various structures. In some embodiments, the battery box 10 can include a first part 10a and a second part 10b, the first part 10a and the second part 10b are overlapped with each other, and the first part 10a and the second part 10b together define a containing space for containing the battery cell 20. The second part 10b can be a hollow structure with one end open, and the first part 10a can be a plate structure, the first part 10a is overlapped with the open side of the second part 10b, so that the first part 10a and the second part 10b together define the containing space; the first part 10a and the second part 10b can also be hollow structures with one side open, and the open side of the first part 10a is overlapped with the open side of the second part 10b. Of course, the battery box 10 formed by the first part 10a and the second part 10b can have various shapes, such as a cylinder, a cuboid, etc.

[0047] In the battery device 100, the battery cell 20 can be one or multiple. When the battery device 100 has multiple battery cells 20, the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, and the mixed connection means that some of the multiple battery cells 20 are connected in series and some are connected in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 20 is contained in the battery box 10; of course, the battery device 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is contained in the battery box 10.

[0048] The cover of the battery box in the related art is usually provided with a shielding layer to shield electromagnetic interference. The shielding layer is usually made of aluminum foil or radiation-proof cloth. The connection position between the cover and the box shell is prone to magnetic leakage.

[0049] Based on the above problems, the battery device 100 is proposed to improve the problem that the connection position between the cover 10a and the box shell 10b is prone to magnetic leakage. The following will be described in detail in combination with specific drawings and embodiments.

[0050] Please refer to Figures 1 to 6 In an embodiment of the present application, the battery device 100 includes a battery box 10 and a battery cell 20. The battery box 10 includes a box shell 10b and a cover 10a. The cover 10a is arranged on the box shell 10b and cooperates with the box shell 10b to form an accommodation space. The battery cell 20 is accommodated in the accommodation space. The cover 10a includes a surface layer 1a and a shielding layer 1b arranged in layers. The surface part of the shielding layer 1b is exposed. The exposed surface of the shielding layer 1b is electrically connected to the box shell 10b through a conductive member 13. The corner part of the cover 10a is provided with a thickened layer.

[0051] In the embodiment, the cover 10a is also referred to as the first part of the battery box 10, and the box shell 10b is also referred to as the second part of the battery box 10. The cover 10a and the box shell 10b are mutually covered to jointly define the accommodation space for accommodating the battery cell 20. The battery box 10 formed by the cover 10a and the box shell 10b can have various shapes, such as a cylinder, a cuboid, etc.

[0052] The surface layer 1a can be an inner surface layer 111 arranged on the inner side surface of the shielding layer 1b, or an outer surface layer arranged on the outer side surface of the shielding layer 1b. In some embodiments, since the shielding layer 1b in the related art is usually made of aluminum foil or radiation-proof cloth, the shielding layer 1b and the surface layer 1a are prone to delamination. The present application can provide apertures in the shielding layer 1b. When the shielding layer 1b and the surface layer 1a are molded together, the resin can infiltrate into each layer of material to increase the interlayer shear strength, so that the shielding layer 1b and the surface layer 1a have good infiltration and interfacial connection effects, thereby effectively improving the problem that the shielding layer 1b and the surface layer 1a are prone to delamination.

[0053] In actual application, the outer side surface of the shielding layer 1b can be correspondingly provided with an outer surface layer to protect the shielding layer 1b with the outer surface layer. Alternatively, when the shielding layer 1b itself has good protection effects against light and salt spray, for example, the shielding layer 1b itself is made of aluminum material with good corrosion resistance, carbon fiber nickel-plated felt with high light and salt spray absorption effect, etc. At this time, the corresponding outer surface layer can not be arranged on the outer side surface of the shielding layer 1b, so that the outer side surface of the shielding layer 1b is directly exposed to the external environment.

[0054] In actual application, the conductive part 13 can be a conductive metal, a conductive foam, a conductive silica gel, a conductive rubber or the like, as long as the shielding layer 1b of the box cover 10a is in conductive connection with the box shell 10b. In addition, the conductive part 13 can be fixedly installed on the exposed surface of the shielding layer 1b in a manner of pasting, plugging, screwing or the like, so as to improve the installation reliability of the conductive part 13.

[0055] The corner of the box cover 10a refers to a position where cornering is needed in the forming process. Optionally, the thickness of the thickened layer can be 2mm-3mm, for example, 2mm, 2.2mm, 2.5mm, 2.7mm, 3mm or the like.

[0056] In summary, in the technical scheme of the embodiment of the present application, the surface part of the shielding layer 1b of the box cover 10a is in an exposed state, so that the shielding layer 1b is in conductive connection between the conductive part 13 and the box shell 10b, so that an electromagnetic shielding channel is formed between the box cover 10a and the box shell 10b, which can reduce the risk of electromagnetic signal leakage from the box cover flange 12, thereby effectively improving the problem of magnetic leakage between the box cover 10a and the box shell 10b.

[0057] In addition, since the corner position of the box cover 10a is prone to accumulate wrinkles during the forming process, the excess material needs to be trimmed to facilitate the layering, therefore, the embodiment additionally increases a small material layer at the corner position of the box cover 10a to form a thickened layer, which can improve the overall strength of the corner position.

[0058] Please refer to Figures 3 to 6 In an embodiment of the present application, the box cover 10a includes a box cover body 11 and a box cover flange 12; the box cover body 11 includes an inner surface layer 111 and a first shielding layer 112 which are arranged in layers; the box cover flange 12 is connected to the edge of the box cover body 11, the box cover flange 12 is connected to the box shell 10b, and the box cover flange 12 includes a second shielding layer 121, the inner side surface of the second shielding layer 121 is exposed; the surface layer 1a includes the inner surface layer 111, the shielding layer 1b includes the first shielding layer 112 and the second shielding layer 121, the first shielding layer 112 is connected to the second shielding layer 121, and the second shielding layer 121 is in conductive connection with the box shell 10b through the conductive part 13.

[0059] In this embodiment, the inner surface layer 111 and the first shielding layer 112 of the box cover body 11 can be integrally formed by mold pressing. Among them, the inner surface layer 111 mainly plays a role of strength support, occupies most of the thickness of the box cover body 11, and can account for more than 70% of the thickness of the box cover body 11. In order to make the inner surface layer 111 have sufficient strength support effect, the thickness of the inner surface layer 111 can be more than 0.4mm, for example, it can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc. In order to make the whole body have sufficient strength, the thickness of the box cover body 11 can be 0.5mm~3mm, for example, it can be 0.5mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 2.8mm, 3mm, etc. For projects with high demand for lightweight, such as low-altitude aircraft, racing cars, etc., the total thickness of the box cover body 11 is preferably 0.8mm, wherein the thickness of the first shielding layer 112 can be 0.1mm~0.2mm, for example, it can be 0.1mm, 0.12mm, 0.15mm, 0.17mm, 0.2mm, etc., and the rest is a continuous fiber layer (inner surface and / or first outer surface layer 113); and for conventional mass production of car projects, the total thickness of the box cover body 11 is preferably 1.3mm~1.4mm, wherein the thickness of the first shielding layer 112 can be 0.1mm~0.3mm, for example, it can be 0.1mm, 0.15mm, 0.2mm, 0.23mm, 0.25mm, 0.2mm, etc., and the rest is a continuous fiber layer (inner surface and / or first outer surface layer 113).

[0060] The thickness of the first shielding layer 112 and the second shielding layer 121 is usually not more than 0.5mm, for example, it can be 0.1mm, 0.12mm, 0.14mm, 0.15mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.25mm, 0.27mm, 0.3mm, 0.34mm, 0.36mm, 0.4mm, 0.45mm, 0.48mm, 0.5mm, etc. Optionally, when the first shielding layer 112 and the second shielding layer 121 are metal shielding layers 1b, the thickness of the first shielding layer 112 and the second shielding layer 121 is usually not more than 0.3mm, and when the first shielding layer 112 and the second shielding layer 121 are fiber felt metal-plated shielding layers 1b, the thickness of the first shielding layer 112 and the second shielding layer 121 can be increased to 0.5mm.

[0061] The box cover flange 12 refers to the area where the box cover 10a is connected with the box shell 10b. The inner side surface of the second shielding layer 121 of the box cover flange 12 is in an exposed state before being connected with the box shell 10b. When the box cover 10a needs to be connected with the box shell 10b, a conductive part 13 can be arranged on the inner side surface of the second shielding layer 121 to realize electrically conductive connection between the conductive part 13 and the box shell 10b, so that a complete shielding channel is formed between the box cover 10a and the box shell 10b, and electromagnetic signal leakage from the box cover flange 12 can be avoided. Alternatively, the second shielding layer 121 of the box cover flange 12 and the first shielding layer 112 of the box cover body 11 can be an integrally formed structure.

[0062] In actual application, in order to make the box cover flange 12 have sufficient rigidity, the total thickness of the box cover flange 12 is usually not less than 2 mm, for example, can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0063] Such a design makes the inner side surface of the second shielding layer 121 of the box cover flange 12 in an exposed state, so that the second shielding layer 121 realizes electrically conductive connection between the conductive part 13 and the box shell 10b, and a shielding channel is formed between the box cover 10a and the box shell 10b, thereby reducing the risk of electromagnetic signal leakage from the box cover flange 12, and effectively improving the problem of magnetic leakage between the box cover 10a and the box shell 10b. Moreover, the design of the box cover flange 12 is more convenient for the conductive part 13 to realize electrically conductive connection between the box cover 10a and the box shell 10b.

[0064] Please refer to Figures 5 to 6 In an embodiment of the present application, the box cover flange 12 is arranged around the edge of the box cover body 11, and the conductive part 13 is arranged to extend along the circumference of the box cover flange 12.

[0065] Such a design makes the box cover flange 12 arranged around the edge of the box cover body 11, so that the box cover flange 12 forms a ring-shaped structure, and the ring-shaped box cover flange 12 is connected with the box shell 10b, which can increase the connection area between the box cover 10a and the box shell 10b, and improve the connection reliability between the box cover 10a and the box shell 10b. In addition, by arranging the conductive part 13 to extend along the circumference of the box cover flange 12, the conductive part 13 also forms a ring-shaped peripheral structure. When the second shielding layer 121 is electrically conductively connected with the box shell 10b through the conductive part 13, a more complete peripheral shielding channel is formed between the box cover 10a and the box shell 10b, a Faraday cage effect is formed, and a stronger electromagnetic shielding effect is achieved, thereby better avoiding electromagnetic signal leakage from the box cover flange 12.

[0066] Please refer to Figures 5 to 6In an embodiment of the present application, the box cover flange 12 is connected with the end face of the box shell 10b, and the conductive part 13 is arranged between the box cover flange 12 and the end face of the box shell 10b.

[0067] The end face of the box shell 10b refers to the end face of the side of the box shell 10b for mounting the box cover 10a.

[0068] In this design, the conductive part 13 is directly arranged between the second shielding layer 121 of the box cover flange 12 and the end face of the box shell 10b to realize the conductive connection between the second shielding layer 121 and the box shell 10b through the conductive part 13, which facilitates the installation of the conductive part 13.

[0069] Please refer to Figures 5 to 6 In an embodiment of the present application, the conductive part 13 is a conductive buffer part.

[0070] The conductive buffer part refers to a structural part that has both conductive function and buffering effect, for example, a conductive foam, a conductive silica gel, a conductive rubber, etc.

[0071] In this design, when the box cover flange 12 is connected with the end face of the box shell 10b, the conductive buffer part is used as the conductive part 13 to realize the conductive connection between the second shielding layer 121 and the box shell 10b, which can press the conductive buffer part under the gravity of the box cover 10a to enable the conductive buffer part to absorb the flatness tolerance of the flange face of the second shielding layer 121 or the box shell 10b, thereby improving the conductive connection reliability between the second shielding layer 121 and the box shell 10b.

[0072] Please refer to Figures 5 to 6 In an embodiment of the present application, the box cover flange 12 is connected with the box shell 10b through the connecting part 14.

[0073] In this design, the connecting part 14 is used to connect the box cover flange 12 with the box shell 10b, which can improve the connection reliability between the box cover flange 12 and the box shell 10b.

[0074] In actual application, the connecting part 14 can be a structure of a bolt 142 cooperating with a pull-rivet nut 141, or a connecting structure part such as a screw or a buckle. In some embodiments, in order to improve the connection reliability between the box cover flange 12 and the box shell 10b and facilitate the disassembly between the box cover flange 12 and the box shell 10b, the connecting part 14 can include the bolt 142 and the pull-rivet nut 141, wherein the box cover flange 12 is provided with a first connecting hole, the box shell 10b is provided with a second connecting hole, the pull-rivet nut 141 is installed in the second connecting hole of the box shell 10b, and the bolt 142 is arranged in the first connecting hole of the box cover flange 12 and riveted with the pull-rivet nut 141, thereby realizing the reliable connection between the box cover 10a and the box shell 10b.

[0075] Please refer to Figures 5 to 6 In an embodiment of the present application, a sealing buffer pad 15 is further arranged between the second shielding layer 121 and the box shell 10b. The sealing buffer pad 15 is an insulating member and is arranged along the circumference of the box cover flange 12. The sealing buffer pad 15 is sleeved on the connecting member 14.

[0076] The sealing buffer pad 15 refers to a structural member with sealing and buffering effects, for example, a sealing rubber ring, a sealing silica gel ring, etc. Alternatively, the sealing buffer pad 15 can be fixedly installed on the inner side surface of the second shielding layer 121 or the end surface of the box shell 10b by means of bonding, interference fit, clamping, etc.

[0077] Such a design can seal the connection between the second shielding layer 121 and the box shell 10b, i.e., the connection between the box cover 10a and the box shell 10b, by using the sealing and buffering member, thereby avoiding impurities from the outside entering the inside of the battery box 10 through the connection between the box cover 10a and the box shell 10b to pollute the battery cell 20.

[0078] Please refer to Figures 5 to 6 In an embodiment of the present application, the conductive member 13 is located outside the sealing buffer pad 15. That is, the conductive member 13 is sleeved on the periphery of the sealing buffer pad 15.

[0079] Such a design can use the space remaining outside the sealing buffer pad 15 to install the conductive member 13, without the need to additionally increase space to install the conductive member 13, so as to simplify the structural design and at the same time make the conductive member 13 not affect the sealing effect of the sealing buffer pad 15.

[0080] In some embodiments, in order to make the conductive member 13 not occupy too much space and at the same time improve the conductive connection effect of the conductive member 13 between the second shielding layer 121 of the box cover 10a and the box shell 10b, the width of the conductive member 13 can be designed to be 3mm-10mm, for example, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0081] In some embodiments, the inner layer 111 can be a continuous fiber layer.

[0082] The continuous fiber layer refers to a layered structure formed by using fibers with a relatively long length and continuous. For example, aramid fiber, glass fiber, carbon fiber, etc. In some embodiments, the density of aramid fiber can be 1.4g / cm 3 , the density of glass fiber can be 2.5 g / cm 3 , and the density of carbon fiber can be 1.8 g / cm 3Aramid fiber, glass fiber has high insulation, can be used in the innermost layer of the inner layer 111 for insulation isolation, according to the lightweight demand of the project to select the specific material used; carbon fiber itself has a certain conductivity, for the project with high shielding requirements, also can increase a certain carbon fiber layer to improve the electromagnetic shielding performance. For example, due to the inner layer 111 and the high voltage parts inside the battery device 100 are relatively close, the inner layer 111 needs to have insulation function, so the inner layer 111 can be aramid fiber layer or glass fiber layer.

[0083] Such design, by using continuous fiber layer as the inner layer 111, not only has high stiffness, but also has lighter mass, so that the inner layer 111 has better strength support effect, at the same time makes the box cover 10a lighter in weight, realizes the lightweight design.

[0084] In some embodiments, the first shielding layer 112 can be at least one of metal mesh, carbon fiber nickel plated felt and graphene conductive cloth.

[0085] Such design, by using at least one of metal mesh, carbon fiber nickel plated felt and graphene conductive cloth as the first shielding layer 112, can make the first shielding layer 112 have better electromagnetic shielding effect, at the same time can form the corresponding aperture to meet the infiltration effect of resin.

[0086] Please refer to Figures 3 to 6 In an embodiment of the present application, the box cover body 11 further comprises a first outer layer 113, the first outer layer 113 is arranged on the outer side surface of the first shielding layer 112 away from the inner layer 111; the box cover flange 12 further comprises a second outer layer 122, the second outer layer 122 is arranged on the outer side surface of the second shielding layer 121, the first outer layer 113 is connected with the second outer layer 122, and the layer 1a further comprises the first outer layer 113 and the second outer layer 122.

[0087] The first outer layer 113 and the first shielding layer 112 can also be integrally formed by die molding, the first outer layer 113 covers the outer side surface of the first shielding layer 112 to realize the protection effect, in order to realize the weight reduction effect, the thickness of the first outer layer 113 can be controlled between 0.1mm~0.3mm, for example, it can be 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.23mm, 0.28mm, 0.3mm and the like.

[0088] Likewise, the second outer layer 122 and the second shielding layer 121 can also be integrally formed by molding, and the second outer layer 122 covers the outer surface of the second shielding layer 121 to achieve the protection effect. In order to achieve the weight reduction effect, the thickness of the second outer layer 122 can be controlled to be between 0.1mm and 0.8mm, for example, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc. Of course, since the inner side of the second shielding layer 121 is not provided with the inner layer 111, in order to improve the structural rigidity of the box cover flange 12, the thickness of the second outer layer 122 can be selectively increased.

[0089] Such a design, by setting the first outer layer 113 on the outer surface of the first shielding layer 112, the first outer layer 113 can be used to protect the first shielding layer 112, avoiding the influence of external light, salt spray and other factors on the electromagnetic shielding effect of the first shielding layer 112. Likewise, by setting the second outer layer 122 on the outer surface of the second shielding layer 121, the second outer layer 122 can be used to protect the second shielding layer 121, avoiding the influence of external light, salt spray and other factors on the electromagnetic shielding effect of the second shielding layer 121.

[0090] In some embodiments, the first outer layer 113 can be a pure resin film or a continuous fiber cloth; and / or, the second outer layer 122 can be a pure resin film or a continuous fiber cloth.

[0091] The pure resin film can be PBT pure resin (polybutylene terephthalate), PA66 pure resin (polyamide 66), etc. The continuous fiber cloth can be aramid fiber, glass fiber, carbon fiber, etc.

[0092] Such a design, by using a pure resin film or a continuous fiber cloth as the first outer layer 113 and the second outer layer 122, the first outer layer 113 and the second outer layer 122 can have better protection effect, and can better isolate the influence of light, salt spray and other factors on the first shielding layer 112 and the second shielding layer 121.

[0093] In some embodiments, the second shielding layer 121 can also be at least one of a metal mesh, a carbon fiber nickel-plated felt, and a graphene conductive cloth.

[0094] Such a design, by using at least one of a metal mesh, a carbon fiber nickel-plated felt, and a graphene conductive cloth as the second shielding layer 121, the second shielding layer 121 can have better electromagnetic shielding effect, and at the same time can form corresponding pores to satisfy the resin infiltration effect.

[0095] Please refer to Figure 4 , Figure 6In an embodiment of the present application, the thickness of the second outer layer 122 is greater than the thickness of the first outer layer 113.

[0096] In this design, since the inner layer 111 does not need to be laid to the inner side surface of the second shielding layer 121 of the cover flange 12, in order to make the cover flange 12 have sufficient rigidity, the embodiment is configured by thickening the second outer layer 122, so that the thickness of the second outer layer 122 is greater than the thickness of the first outer layer 113.

[0097] In some embodiments, in order to make the second outer layer 122 have sufficient rigidity, the part of the second outer layer 122 that is thickened can be made of continuous fiber composite material, and the fiber volume content is above 35%.

[0098] Please refer to Figure 4 In an embodiment of the present application, the cover body 11 includes a cover top plate 11a and a cover side plate 11b; the cover top plate 11a includes a top inner layer 1111, a top shielding layer 1121 and a top outer layer 1131 which are sequentially stacked; the cover side plate 11b includes a side inner layer 1112, a side shielding layer 1122 and a side outer layer 1132 which are sequentially stacked, and the cover side plate 11b is arranged at an angle with the cover top plate 11a and the cover flange 12; the top inner layer 1111 is connected with the side inner layer 1112 and constitutes the inner layer 111; the top shielding layer 1121 is connected with the side shielding layer 1122 and constitutes the first shielding layer 112, and the side shielding layer 1122 is connected with the second shielding layer 121; the top outer layer 1131 is connected with the side outer layer 1132 and constitutes the first outer layer 113, and the side outer layer 1132 is connected with the second outer layer 122.

[0099] In this embodiment, from the structural area division, the cover 10a can include a cover top plate 11a, a cover side plate 11b and a cover flange 12, wherein the cover top plate 11a and the cover side plate 11b can be designed in the same layering manner, and at the position of the cover flange 12, in order to make the second shielding layer 121 of the cover flange 12 can be exposed, so that the second shielding layer 121 can realize good equipotential through the conductive part 13 with the cover 10a, therefore the layering manner of the cover flange 12 is that the inner layer 111 does not need to be laid at the cover flange 12.

[0100] This design can make the cover top plate 11a and the cover side plate 11b of the cover body 11 form a π-shaped cover 10a with the cover flange 12, so as to form a hollow structure with one side open, so that the cover 10a and the box shell 10b can jointly define a larger space accommodating space, and the designed cover body 11 is not easy to deform, which can improve the anti-deformation effect of the cover 10a.

[0101] Please refer to Figures 3 to 6 The application also provides a box cover 10a, comprising a surface layer 1a and a shielding layer 1b arranged in a stack, a surface part of the shielding layer 1b is exposed, and the exposed surface of the shielding layer 1b is configured to be in conductive connection with the box shell 10b through the conductive part 13; the corner part of the box cover 10a is provided with a thickened layer.

[0102] Such a design, by exposing the surface part of the shielding layer 1b of the box cover 10a, makes the shielding layer 1b achieve conductive connection between the conductive part 13 and the box shell 10b, so that an electromagnetic shielding channel is formed between the box cover 10a and the box shell 10b, which can reduce the risk of electromagnetic signal leakage from the box cover flange 12, thereby effectively improving the problem of magnetic leakage between the box cover 10a and the box shell 10b.

[0103] In addition, due to the fact that the corner part of the box cover 10a is prone to accumulate wrinkles during molding, it is necessary to trim the excess material to facilitate the layering, therefore, the embodiment additionally increases a small material layer at the corner position of the corner part of the box cover 10a to form a thickened layer, which can improve the overall strength of the corner position.

[0104] The application also provides a power-using equipment, which comprises the battery device 100, the specific structure of which is referred to the above-mentioned embodiments, since the power-using equipment adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0105] The above-mentioned is only an exemplary embodiment of the application, and does not limit the patent scope of the application, any equivalent structural transformation made by referring to the content of the specification and drawings of the application, or direct / indirect application in other related technical fields is included in the patent protection scope of the application.

Claims

1. A battery device, characterized by, The battery device comprises a battery box and a battery cell, the battery box comprises a box shell and a box cover, the box cover is arranged on the box shell and forms a containing space together with the box shell, the battery cell is contained in the containing space, and the box cover comprises: a surface layer and a shielding layer arranged in layers, a surface portion of the shielding layer is exposed, and a surface of the shielding layer exposed outside is electrically connected with the box shell through a conductive member; and a thickened layer is arranged at a corner of the box cover.

2. The battery device of claim 1, wherein The box cover comprises: a box cover main body comprising an inner surface layer and a first shielding layer arranged in layers; a box cover flange connected to an edge of the box cover main body, the box cover flange being connected with the box shell, the box cover flange comprising a second shielding layer, an inner surface of the second shielding layer being exposed; the surface layer comprises the inner surface layer, the shielding layer comprises the first shielding layer and the second shielding layer, the first shielding layer is connected with the second shielding layer, and the second shielding layer is electrically connected with the box shell through the conductive member.

3. The battery device of claim 2, wherein The box cover flange is arranged around the edge of the box cover main body, and the conductive member is arranged in extension along the circumference of the box cover flange.

4. The battery device of claim 2, wherein The box cover flange is connected with an end surface of the box shell, and the conductive member is arranged between the box cover flange and the end surface of the box shell.

5. The battery device of claim 4, wherein The conductive member is a conductive buffer member.

6. The battery device according to any one of claims 2 to 5, wherein The box cover flange is connected with the box shell through a connecting member.

7. The battery device of claim 6, wherein A sealing buffer pad is further arranged between the second shielding layer and the box shell, the sealing buffer pad is an insulating member, is arranged in extension along the circumference of the box cover flange, and is sleeved on the connecting member.

8. The battery device of claim 7, wherein The conductive member is located outside the sealing buffer pad.

9. The battery device of any one of claims 2 to 5, wherein, The box cover main body further comprises a first outer surface layer arranged on an outer surface of the first shielding layer away from the inner surface layer; the box cover flange further comprises a second outer surface layer arranged on an outer surface of the second shielding layer, the first outer surface layer is connected with the second outer surface layer, and the surface layer further comprises the first outer surface layer and the second outer surface layer.

10. The battery device of claim 9, wherein, The thickness of the second outer surface layer is greater than that of the first outer surface layer.

11. The battery device of claim 9, wherein The box cover main body comprises: a box cover top plate comprising a top inner surface layer, a top shielding layer and a top outer surface layer arranged in layers in sequence; a box cover side plate comprising a side inner surface layer, a side shielding layer and a side outer surface layer arranged in layers in sequence, the box cover side plate being arranged at an angle with the box cover top plate and the box cover flange; the top inner surface layer is connected with the side inner surface layer and constitutes the inner surface layer, the top shielding layer is connected with the side shielding layer and constitutes the first shielding layer, the side shielding layer is connected with the second shielding layer, the top outer surface layer is connected with the side outer surface layer and constitutes the first outer surface layer, and the side outer surface layer is connected with the second outer surface layer.

12. A box cover characterized by comprises: a surface layer and a shielding layer arranged in layers, a surface portion of the shielding layer is exposed, and a surface of the shielding layer exposed outside is electrically connected with the box shell through a conductive member; a thickened layer is arranged at a corner of the box cover.

13. An electrical device, characterized by The battery device comprises the battery device according to any one of claims 1 to 11.

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