Battery device and power device

Abstract

The present application relates to a battery device and an electrical device, comprising: a box body having a storage space; a battery cell, which is stored in the storage space; a connecting plate, which is attached to the bottom plate of the box body; and at least one connecting member, wherein the connecting member comprises a step portion and a main body, wherein the main body is arranged on the step portion; the step portion is attached to the side of the connecting plate away from the bottom plate, and the main body passes through the connecting plate and the bottom plate in sequence; the main body comprises a deformable section and a connecting section, wherein the deformable section is connected to the step portion through the connecting section; wherein the thickness of the connecting plate, the length of the connecting section, the sum of the thickness of the bottom plate and the connecting plate, and the sum of the length of the deformable section and the connecting section increase in sequence. A battery device and an electrical device according to an embodiment of the present application have the advantage that the deformation position of the connecting member is stable.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] As the market share of electric vehicles gradually increases, the driving conditions and usage scenarios of electric vehicles are becoming more diverse and complex. In related technologies, when the battery is placed inside the electric vehicle, a box bottom plate is often used to protect the bottom of the battery.

[0003] Since the deformation position of the connecting parts currently used in the bottom plate of the box body is unstable, it is easy to cause quality problems. Summary of the invention

[0004] Based on this, it is necessary to provide a battery device and an electrical device to address the problem of unstable deformation position of the connecting member.

[0005] The first aspect of the present application provides a battery device, comprising: a box body having a accommodating space; a battery cell accommodated in the accommodating space; a connecting plate attached to the bottom plate of the box body; and at least one connecting member, the connecting member comprising a step portion and a main body portion, the main body portion being arranged on the step portion; the step portion being attached to a side of the connecting plate away from the bottom plate, the main body portion passing through the connecting plate and the bottom plate in sequence; the main body portion comprising a deformable section and a connecting section, the deformable section being connected to the step portion through the connecting section; wherein the thickness of the connecting plate, the length of the connecting section, the sum of the thickness of the bottom plate and the connecting plate, and the sum of the length of the deformable section and the connecting section increase in sequence.

[0006] By setting the thickness of the connecting plate, the length of the connecting section, and the sum of the thickness of the bottom plate and the connecting plate to increase in sequence, the tolerance range that the connecting piece can adapt to is effectively improved, so that after the bottom plate, the connecting plate and the connecting piece are assembled, the top of the deformation section that is easier to deform is always within the thickness range of the bottom plate, thereby ensuring that the deformation section will not deform within the range of the connecting plate, thereby avoiding damage to the connecting plate, and making the connection quality of the assembly consisting of the connecting plate and the bottom plate more stable; in addition, by setting the sum of the thickness of the bottom plate and the connecting plate, and the sum of the length of the deformation section and the connecting section to increase in sequence, it is ensured that the bottom end of the deformation section that is easier to deform is located outside the thickness range of the bottom plate, so that the deformation section will bulge before the connecting section, and ensure that the bulging deformation area is located outside the thickness range of the bottom plate, so that the connecting piece can adapt to the bottom plate and the connecting plate with a larger plate thickness tolerance, and finally, the deformation section is controlled to deform in the section passing through the bottom plate so as to cooperate with the step portion to achieve axial limit, complete the fixation of the bottom plate and the connecting plate, and make the connection quality of the assembly consisting of the connecting plate and the bottom plate more stable.

[0007] In one embodiment, a part of the deformation section passes through the bottom plate, and another part of the deformation section is located inside the bottom plate; a part of the connecting section is located inside the bottom plate, and another part of the connecting section is located inside the connecting plate. By controlling the length of the connecting section, a part of the deformation section passes through the bottom plate downward, and another part of the deformation section is located inside the bottom plate. In this way, it can be ensured that the top end of the deformation section is always within the thickness range of the bottom plate, thereby ensuring that the deformation section will not deform within the range of the connecting plate, thereby avoiding damage to the connecting plate, making the connection of the assembly consisting of the connecting plate and the bottom plate more stable; and ensuring that the bottom end of the deformation section is located outside the thickness range of the bottom plate; and then the deformation section can be controlled to deform in the section passing through the bottom plate so as to cooperate with the step portion to achieve axial limitation, and finally fix the bottom plate and the connecting plate, making the connection of the assembly consisting of the connecting plate and the bottom plate more stable.

[0008] In one embodiment, the main body includes a stepped protrusion, and the stepped protrusion is arranged on the connecting section. In this way, the strength of the connecting section can be further increased, so that the connecting section can be adapted to the bottom plate and the connecting plate with a larger plate thickness tolerance, and ensure that the connecting section will not be deformed secondary.

[0009] In one embodiment, the cross section of the main body is hexagonal. By setting the cross section projection of the main body to be hexagonal, the main body and the bottom plate can be fixed circumferentially.

[0010] In one embodiment, a plurality of grooves are formed on the side wall of the deformation section. The grooves can effectively reduce the average wall thickness of the deformation section to ensure that the deformation section deforms first and the connection section remains unchanged when there is no external restraint and under the same external force.

[0011] In one embodiment, a plurality of convex strips are formed on the side wall of the connecting section. The convex strips can effectively increase the average wall thickness of the connecting section to ensure that the deformable section deforms first and the connecting section remains unchanged when there is no external restraint and under the same external force.

[0012] In one embodiment, the connecting member is a rivet nut.

[0013] In one embodiment, the main body is formed with a cavity, and the cavity is formed with an opening at one end of the main body close to the step portion; the end of the cavity away from the opening is provided with an internal thread, and the internal thread extends upward into the range of the deformation section. In this way, the main body passes through the connecting plate and the bottom plate in turn, and the external screw is screwed with the internal thread, and the main body is pulled upward along the thickness direction. The deformation section is located outside the thickness range of the bottom plate and the area close to the bottom plate can be deformed to expand outward, and the deformation part and the step portion of the deformation section can be respectively used as axial limiters and distributed on both sides of the assembly composed of the connecting plate and the bottom plate to avoid relative displacement between the bottom plate and the connecting plate.

[0014] In one embodiment, the bottom plate is formed with an anti-rotation hole, the connecting plate is formed with a through hole corresponding to the anti-rotation hole; the main body passes through the through hole and the anti-rotation hole in sequence; the deformation section is circumferentially fixed to the anti-rotation hole; the diameter of the through hole is larger than the anti-rotation hole. In this way, the anti-rotation setting of the main body and the bottom plate can be ensured and the main body and the connecting plate can be prevented from being over-positioned, which is convenient for assembly.

[0015] In one embodiment, the connecting plate is a heat exchange plate.

[0016] In one embodiment, the connecting plate includes a first adhesive layer, which is disposed on a side of the connecting plate facing the bottom plate; and / or the connecting plate includes a second adhesive layer, which is disposed on a side of the connecting plate facing away from the bottom plate. In this way, a sealing function can be achieved.

[0017] In one embodiment, the thickness of the connecting plate is 2.0mm-3.5mm; the thickness of the bottom plate is 1.8mm-3.2mm; the length of the deformation section is 7mm-8mm; and the length of the connecting section is 3.5mm-5mm.

[0018] A second aspect of the present application provides an electrical device, comprising the above-mentioned battery device, wherein the battery device is used to provide electrical energy.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0021] Figure 2 Schematic diagram of the exploded structure of a battery provided for some embodiments of the present application.

[0022] Figure 3 A schematic diagram of the structure of a battery module provided in some embodiments of the present application.

[0023] Figure 4 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0024] Figure 5 A schematic diagram of the structure of a base plate, a connecting plate and connecting parts provided in some embodiments of the present application.

[0025] Figure 6 A schematic diagram of the matching relationship between a base plate, a connecting plate and a connecting member provided in some embodiments of the present application, wherein the deformation section does not deform.

[0026] Figure 7 Schematic diagram of the matching relationship between the base plate, the connecting plate and the connecting member provided in other embodiments of the present application, wherein the deformation section does not deform.

[0027] Figure 8 A schematic diagram of the structure of a connector provided in some embodiments of the present application.

[0028] Fig. 9 A schematic diagram of the matching relationship between a base plate, a connecting plate and a connecting member provided in some embodiments of the present application, wherein the deformation section has been deformed.

[0029] Description of reference numerals:

[0030] Vehicles - 1000;

[0031] Battery 100, housing 110, first part 111, second part 112, battery module 120, battery cell 121, end cap 122, housing 123, electrode assembly 124, electrode terminal 125, controller 200, motor 300;

[0032] Bottom plate-10, anti-rotation hole-11, connecting plate-20, first adhesive layer-21, second adhesive layer-22, through hole-23, connecting piece-30, step portion-31, main body-32, deformation section-33, deformation portion-33a, groove-331, connecting section-34, step protrusion-35, cavity-36, internal thread-37. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0035] In the description of the embodiments of the present application, if the technical terms "first", "second", etc. appear, these terms are only used for descriptive purposes 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.

[0036] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] In the description of the embodiments of the present application, if the term "multiple" appears, "multiple" means at least two (including two), such as two, three, etc., unless otherwise clearly and specifically defined. Similarly, if the term "multiple groups" appears, "multiple groups" refers to more than two groups (including two groups), and if the term "multiple sheets" appears, "multiple sheets" refers to more than two sheets (including two sheets).

[0039] In the description of the embodiments of the present application, if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if the technical terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and 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 meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0043] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0044] Since different electrical devices have different usage scenarios, when batteries are used in different electrical devices, they are required to be able to adapt to various harsh usage scenarios. For example, when batteries are used in electric vehicles, the driving conditions and usage scenarios of electric vehicles are very diverse and complex. Batteries are usually installed on the floor of electric vehicles, which puts higher fixing requirements on the bottom protection of the batteries.

[0045] In the related art, the bottom of the battery box is often arranged in a layered structure, the connecting plate is used to achieve heat exchange with the battery cell, and the bottom plate is arranged at the bottom of the connecting plate. The adjacent bottom plates and connecting plates are connected by means of connecting pieces, etc., but the thickness of the connecting plate used at the bottom of the current battery box has a certain tolerance range, and the bottom plate can be embedded with the outer peripheral side of the connecting piece, thereby achieving a binding effect. Therefore, when part of the section of the connecting piece is within the range of the bottom plate, it will not be deformed even if it is subjected to external force. There are many gaps between the connecting plate and the outer circumference of the connecting piece, so the connecting plate will not restrain the outer circumference of the connecting piece; further, when a partial section of the connecting piece is within the range of the connecting plate and is subjected to external force, the connecting piece will be deformed inside the connecting plate, but this deformation cannot serve as an axial limit for the bottom plate of the battery box and will cause damage to the connecting plate structure; for this reason, designers often design a certain tolerance when designing the connecting piece to ensure that the above situation does not occur; however, the tolerance range that the connecting piece can adapt to is extremely limited, which leads to unstable deformation position of the connecting piece when it is used to fix the connecting plate and the bottom plate, that is, the deformation of the connecting piece occurs inside the connecting plate, which leads to quality risks at the bottom of the battery box.

[0046] In order to alleviate the problem of unstable deformation position of the connector, a deformation section can be designed for the connector, and the thickness of the connecting plate and the bottom plate can be designed to achieve overall size control, ensuring that the top of the deformation section is always within the thickness range of the bottom plate, and the bottom end of the deformation section is outside the thickness range of the bottom plate, so that the deformation section will bulge and deform before other sections, allowing the connector to adapt to the bottom plate and connecting plate with a larger plate thickness tolerance, making the connection quality at the bottom of the battery box more stable.

[0047] The embodiments of the present application provide a battery device and an electric device, which may be, but not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0048] It should be understood that the technical solutions generally described in the embodiments of the present application are not limited to the batteries and electrical devices described above, but can also be applied to all batteries including a box and electrical devices using batteries. However, for the sake of simplicity of description, an electrical device in an embodiment of the present application is taken as an example of vehicle 1000.

[0049] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0050] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0051] Figure 2 An exploded view of a battery 100 provided for some embodiments of the present application; Figure 3 This is a schematic diagram of the structure of the battery module provided in some embodiments of the present application. Figure 2 and Figure 3 In order to meet different power requirements, the battery 100 may include a plurality of battery cells 121 and a housing 110. The battery cell 121 refers to the smallest unit constituting the battery module 120 or the battery pack. The plurality of battery cells 121 may be connected in series and / or in parallel via electrode terminals for various applications. The housing 110 is used to accommodate the battery cells 121 or the battery module 120 to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells 121.

[0052] The box 110 can adopt a variety of structures. In some embodiments, the box 110 can include a first part 111 and a second part 112, the first part 111 and the second part 112 cover each other, and the first part 111 and the second part 112 jointly define a storage space for accommodating the battery cell 121. The second part 112 can be a hollow structure with one end open, and the first part 111 can be a plate-like structure. The first part 111 covers the open side of the second part 112, so that the first part 111 and the second part 112 jointly define a storage space; the first part 111 and the second part 112 can also be hollow structures with one side open, and the open side of the first part 111 covers the open side of the second part 112. Of course, the box 110 formed by the first part 111 and the second part 112 can be in a variety of shapes, such as a simple three-dimensional structure such as a single cuboid or a cylinder or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as a cuboid or a cylinder or a sphere, and the embodiments of the present application are not limited to this. The material of the box body 110 can be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, etc., or a composite material such as glass fiber and epoxy resin, and the implementation mode of the present application is not limited to this.

[0053] In the embodiment of the present application, multiple battery cells 121 can directly form a battery pack, or they can first form a battery module 120, and then the battery module 120 can form a battery pack. Specifically, multiple battery cells 121 can be directly connected in series, parallel or mixed together to form a whole, and then the whole formed by multiple battery cells 121 is accommodated in the box 110. Alternatively, multiple battery cells 121 can first be connected in series, parallel or mixed together to form a battery module 120, and then multiple battery modules 120 can be connected in series, parallel or mixed together to form a whole, and then accommodated in the box 110.

[0054] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 121 .

[0055] Each battery cell 121 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but it is not limited thereto. The battery cell 121 can be cylindrical, flat, rectangular or other shapes. The battery cells 121 are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the implementation method of the present application is not limited to this. However, for the sake of simplicity, the following embodiments are all described by taking the square lithium-ion battery cell 121 as an example.

[0056] Please refer to Figure 4 , Figure 4The schematic diagram of the exploded structure of the battery cell 121 provided in some embodiments of the present application. The battery cell 121 includes an end cap 122, a housing 123, an electrode assembly 124 and other functional components.

[0057] The end cap 122 refers to a component that covers the opening of the shell 123 to isolate the internal environment of the electrode assembly 124 from the external environment. Without limitation, the shape of the end cap 122 can be adapted to the shape of the shell 123 to match the shell 123. Optionally, the end cap 122 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 122 is not easily deformed when it is squeezed and collided, so that the battery cell 121 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 125 can be provided on the end cap 122. The electrode terminal 125 can be used to electrically connect to the electrode assembly 124 for outputting or inputting electrical energy of the battery cell 121. In some embodiments, the end cap 122 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 121 reaches a threshold. The material of the end cap 122 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 122 to isolate the electrical connection components in the housing 123 from the end cap 122 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0058] The shell 123 is a component used to cooperate with the end cap 122 to form the internal environment of the battery cell 121, wherein the formed internal environment can be used to accommodate the electrode assembly 124, the electrolyte and other components. The shell 123 and the end cap 122 can be independent components, and an opening can be set on the shell 123, and the internal environment of the battery cell 121 is formed by covering the opening with the end cap 122 at the opening. Without limitation, the end cap 122 and the shell 123 can also be integrated. Specifically, the end cap 122 and the shell 123 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 123, the end cap 122 covers the shell 123. The shell 123 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 123 can be determined according to the specific shape and size of the electrode assembly 124. The shell 123 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0059] The electrode assembly 124 is a component in the battery cell 121 where an electrochemical reaction occurs. One or more electrode assemblies 124 may be contained in the housing 123. The electrode assembly 124 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 124, and the parts of the positive and negative electrode sheets without active materials each constitute a pole ear (not shown). The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the pole ear connects the electrode terminal 125 to form a current loop.

[0060] See also Figures 5 to 9 As shown, Figure 5 A schematic diagram of the structure of a base plate, a connecting plate and connecting parts provided in some embodiments of the present application. Figure 6 A schematic diagram of the matching relationship among a base plate, a connecting plate and connecting parts provided in some embodiments of the present application. Figure 7 Schematic diagram of the matching relationship between the base plate, connecting plate and connecting parts provided in other embodiments of the present application. Figure 8 A schematic diagram of the structure of a connector provided in some embodiments of the present application. Fig. 9 A schematic diagram of the matching relationship among a base plate, a connecting plate and connecting parts provided in some embodiments of the present application.

[0061] A first aspect of the present application provides a battery device, including: a box body 110 , a battery cell 121 , a connecting plate 20 , and at least one connecting member 30 .

[0062] The box body 110 has a storage space; the battery cell 121 is stored in the storage space of the box body 110; the connecting plate 20 is attached to the bottom plate 10 of the box body 110;

[0063] The connecting member 30 includes a step portion 31 and a main body portion 32, and the main body portion 32 is arranged on the step portion 31; the step portion 31 is attached to the side of the connecting plate 20 away from the bottom plate 10, and the main body portion 32 passes through the connecting plate 20 and the bottom plate 10 in sequence; the main body portion 32 includes a deformable section 33 and a connecting section 34, and the deformable section 33 is connected to the step portion 31 through the connecting section 34;

[0064] Among them, the thickness of the connecting plate 20, the length of the connecting section 34, the sum of the thickness of the bottom plate 10 and the connecting plate 20, and the sum of the length of the deformation section 33 and the connecting section 34 increase in sequence. Specifically, when the size of the component composed of the connecting plate 20 and the bottom plate 10 is designed, the thickness of each part should be controlled to ensure adaptation. The thickness of the bottom plate 10 is e2, and the range of e2 is 1.8mm-3.2mm. The connecting plate 20 is attached to the bottom plate 10, and the thickness of the connecting plate 2 is e1, and the range of e1 is 2.0mm-3.5mm. The length of the deformation section 33 is S, and the range of S is 7mm-8mm; the length of the connecting section 34 is E, and the range of E is 3.5mm-5mm, and e1≤E≤e1+e2≤E+S is satisfied.

[0065] It should be noted that in the structure of the connecting member 30, the deformable section 33 is a section of the main body 32 that is more easily deformed than the connecting section 34. That is to say, without external restraint and under the same external force, the deformable section 33 will be deformed to expand outward first. Fig. 9 As shown, the deformable portion 33 a and the step portion 31 of the deformable segment 33 can be respectively used as axial limiters and distributed on both sides of the assembly composed of the connecting plate 20 and the bottom plate 10 to prevent relative displacement between the bottom plate 10 and the connecting plate 20 .

[0066] The bottom plate 10 can be engaged with the outer peripheral side of the main body 32 to achieve a binding effect. Therefore, when a portion of the deformation section 33 is within the bottom plate 10, the deformation section 33 in this section will not deform even if it is subjected to external force.

[0067] There are many gaps between the connecting plate 20 and the outer circumference of the main body 32; therefore, the connecting plate 20 will not constrain the outer circumference of the main body 32. If part of the deformation section is within the range of the connecting plate 20, due to the lack of constraint, when subjected to external force, the deformation section within the range of the connecting plate 20 will be deformed, but this deformation cannot serve as an axial limit for the assembly composed of the connecting plate 20 and the bottom plate 10, and will cause structural damage to the connecting plate 20.

[0068] The main body 32 extends along the thickness direction of the connecting plate 20 and the bottom plate 10. The deformation section 33 is a partial section of the main body 32. The top end of the deformation section 33 is the end of the deformation section 33 close to the step portion 31. Similarly, the bottom end of the deformation section 33 is the end of the deformation section 33 away from the step portion 31.

[0069] In the embodiment of the present application, by setting the thickness of the connecting plate 20, the length of the connecting section 34, and the sum of the thickness of the bottom plate 10 and the connecting plate 20 to increase in sequence, the tolerance range that the connecting member 30 can adapt to is effectively improved, so that after the bottom plate 10, the connecting plate 20 and the connecting member 30 are assembled, the top of the deformation section 33 that is easier to deform is always within the thickness range of the bottom plate 10, thereby ensuring that the deformation section 33 will not deform within the range of the connecting plate 20, thereby avoiding damage to the connecting plate 20, and making the connection quality of the assembly composed of the connecting plate 20 and the bottom plate 10 more stable; in addition, by setting the sum of the thickness of the bottom plate 10 and the connecting plate 20, and the deformation section The sum of the lengths of 33 and the connecting section 34 increases successively, ensuring that the bottom end of the deformation section 33 which is easier to deform is located outside the thickness range of the bottom plate 10. In this way, the deformation section 33 will bulge and deform before the connecting section 34, and ensure that the bulging deformation area 33a is located outside the thickness range of the bottom plate 10, so that the connecting piece 30 can adapt to the bottom plate 10 and the connecting plate 20 with a larger plate thickness tolerance. Finally, the deformation section 33 is controlled to deform in the section passing through the bottom plate 10 so as to cooperate with the step portion 31 to achieve axial limitation, thereby completing the fixation of the bottom plate 10 and the connecting plate 20, so that the connection quality of the assembly consisting of the connecting plate 20 and the bottom plate 10 is more stable.

[0070] Understandably, combined Figure 6 and Figure 7 , the stacking direction of the bottom plate 10 and the connecting plate 20 in the figure is the thickness direction of the two. When the assembly composed of the connecting plate 20 and the bottom plate 10 is set on a structure that needs to be protected, for example, when it is set at the bottom of the battery pack, it is connected to the battery box along the thickness direction, that is, along the stacking direction of the bottom plate 10 and the connecting plate 20. In this way, when the battery box is impacted by external force, the assembly composed of the connecting plate 20 and the bottom plate 10 can effectively protect the battery device.

[0071] In some embodiments, the bottom plate 10 can be disposed at the bottom of the battery box 120. The bottom plate 10 can generally be a square plate or a circular plate for ease of manufacture. The bottom plate 10 can be formed by stamping a sheet metal part, and is used to support the connecting plate 20 and the battery cells 121 on the connecting plate 20, and provide corresponding protection to prevent external gravel or other parts from colliding with the battery cells 121.

[0072] In some embodiments, the connecting plate 20 may be a heat exchange plate. Specifically, the connecting plate 20 may generally be a square plate or a circular plate. The top side wall of the connecting plate 20 generally serves as the main wall structure for supporting the battery cell 121, and the bottom side wall of the connecting plate 20 is stacked on the bottom plate 10; a heat exchange medium flows inside the connecting plate 20 for heat exchange with the battery cell 121. The heat exchange medium may be water, alcohol or other liquid mixtures. During the flow of the heat exchange medium inside the connecting plate 20, it can effectively absorb the heat transferred from the side wall of the connecting plate 20 to achieve heat dissipation and cooling, or it can transfer the heat to the side wall of the connecting plate 20 to achieve heating.

[0073] Optionally, the main body 32 can be made of carbon steel or stainless steel, which has good structural strength. The main body 32 is a columnar structure with one end open.

[0074] Optionally, the step portion 31 is a flange to provide axial limit. The step portion 31 can be made of carbon steel or stainless steel, which has good structural strength. The step portion 31 is a flat plate structure as a whole to obtain a larger force-bearing area for achieving axial limit. The main body 32 is integrally connected to the step portion 31, and the connection method can be welding or direct integral casting.

[0075] In some possible embodiments, see Figures 5 to 9 As shown, a portion of the deformation section 33 passes through the bottom plate 10 , and another portion of the deformation section 33 is located in the bottom plate 10 ; a portion of the connecting section 34 is located in the bottom plate 10 , and another portion of the connecting section 34 is located in the connecting plate 20 .

[0076] Among them, in the structure of the connecting member 30, the connecting section 34 is a section of the main body 32 that is less likely to deform than the deformable section 33. That is to say, without external restraint and under the same external force, the deformable section 33 will deform first, while the connecting section 34 remains unchanged.

[0077] By controlling the length of the connecting section 34, a part of the deformation section 33 passes downward through the bottom plate 10, and the other part of the deformation section 33 is located inside the bottom plate 10. In this way, it can be ensured that the top end of the deformation section 33 is always within the thickness range of the bottom plate 10, thereby ensuring that the deformation section 33 will not deform within the range of the connecting plate 20, thereby avoiding damage to the connecting plate 20, making the connection between the connecting plate 20 and the bottom plate 10 more stable; and ensuring that the bottom end of the deformation section 33 is located outside the thickness range of the bottom plate 10 of the bottom plate 10; and then the deformation section 33 can be controlled to deform in the section passing through the bottom plate 10 so as to cooperate with the step portion 31 to achieve axial limitation, and finally fix the bottom plate 10 and the connecting plate 20, so that the connection between the connecting plate 20 and the bottom plate 10 is more stable.

[0078] Optionally, the wall thickness of the connecting section 34 is greater than the wall thickness of the deforming section 33, so as to ensure that, without external restraint and under the same external force, the deforming section 33 is deformed first, while the connecting section 34 remains unchanged;

[0079] Optionally, the wall material strength of the connecting section 34 is greater than the wall material strength of the deforming section 33 to ensure that, in the absence of external constraints and under the same external force, the deforming section 33 deforms first while the connecting section 34 remains unchanged.

[0080] In some possible embodiments, see Figure 7 As shown, the main body 32 includes a stepped protrusion 35, which is disposed on the connecting section 34. In this way, the strength of the connecting section 34 can be further increased, so that the connecting section 34 can be adapted to the bottom plate 10 and the connecting plate 20 with a larger plate thickness tolerance, and ensure that the connecting section 34 will not be deformed secondary.

[0081] Specifically, the step protrusion 35 is disposed on the section of the connecting section 34 located on the connecting plate 20 , so that interference between the step portion 35 and the bottom plate 10 can be avoided.

[0082] Optionally, the step protrusion 35 and the connecting section 34 can be integrally formed by a turning process; or they can be fixed by welding.

[0083] In some possible embodiments, see Figures 5 to 9 As shown, the cross section of the main body 32 is hexagonal, that is, the connecting member 30 is a hexagonal connecting member.

[0084] It can be understood that the deformation section 33 and the connection section 34 are both part of the main body 32 , and therefore the cross sections of the deformation section 33 and the connection section 34 are both hexagonal.

[0085] By setting the cross-sectional projection of the main body 32 to be hexagonal, the main body 32 and the bottom plate 10 can be circumferentially fixed.

[0086] Specifically, an anti-rotation hole 11 matched with the main body 32 may be formed on the bottom plate 10 . The anti-rotation hole 11 is a hexagonal hole that can be circumferentially fixed with the main body 32 .

[0087] In some other embodiments, the cross-section of the main body 32 may be a quadrilateral, an octagon, or other shapes that can achieve anti-rotation, which is not limited in the present application.

[0088] In some possible embodiments, see Figures 5 to 9 As shown, a plurality of grooves 331 are formed on the side wall of the deformation section 33. The grooves 331 can effectively reduce the average wall thickness of the deformation section 33 to ensure that the deformation section 33 is deformed first and the connection section 34 remains unchanged without external restraint and under the same external force.

[0089] Specifically, for the deformation segment 33 with a hexagonal cross section, different numbers of grooves 331 may be provided on one side wall, multiple side walls, or each side wall of the deformation segment 33 .

[0090] In the embodiment of the present application, the groove 331 is in the shape of an elongated strip and extends in the thickness direction; four grooves 331 are arranged on each side wall of the deformation section 33, the groove width of the groove 331 is 0.5mm-1mm, the groove depth is 0.2mm-0.5mm, and the intervals between each other are 0.5mm-1mm.

[0091] In other embodiments, the groove 331 may also be arranged around the circumference of the deformation section 33; the specific design shall prevail, and the present application does not impose any limitation on this.

[0092] In some possible embodiments, a plurality of convex strips (not shown) are formed on the side wall of the connecting section 34. The convex strips can effectively increase the average wall thickness of the connecting section 34 to ensure that the deformable section 33 deforms first and the connecting section 34 remains unchanged when there is no external restraint and under the same external force.

[0093] Optionally, the convex strip is in the shape of an elongated strip and is arranged on the side wall of the connecting section 34 and extends in the thickness direction; in other embodiments, the convex strip may also be arranged circumferentially around the connecting section 34; the specific design shall prevail, and the present application does not impose any limitation on this.

[0094] In some possible embodiments, see Figures 5 to 9 As shown, the connector 30 may be a rivet nut. Specifically, the connector 30 may be a pressure rivet nut or a pull rivet nut, which is subject to the design.

[0095] In some possible embodiments, see Figures 5 to 9 As shown, the main body 32 is formed with a cavity 36, and the cavity 36 is formed with an opening (not marked) at one end of the main body 32 close to the step portion 31; the end of the cavity 36 away from the opening is provided with an internal thread 37, and the internal thread 37 extends upward into the range of the deformation section 33. In this way, the main body 32 passes through the connecting plate 20 and the bottom plate 10 in sequence, and the external screw is screwed with the internal thread 37, and the main body 32 is pulled upward along the thickness direction. The deformation section 33 is located outside the thickness range of the bottom plate 10 and the area close to the bottom plate 10 can be deformed to expand outward, and the deformation part of the deformation section 33 and the step portion 31 can be respectively used as axial limiters and distributed on both sides of the assembly composed of the connecting plate 20 and the bottom plate 10 to prevent the bottom plate 10 and the connecting plate 20 from relative displacement.

[0096] In some embodiments, the cavity 36 may be a rivet cavity of a rivet nut.

[0097] In some possible embodiments, see Figures 5 to 9 As shown, the base plate 10 is formed with an anti-rotation hole 11 adapted to the main body 32, and the connecting plate 20 is formed with a through hole 23 corresponding to the anti-rotation hole 11; the main body 32 passes through the through hole 23 of the connecting plate 20 and the anti-rotation hole 11 of the base plate 10 in sequence; the deformation section 33 is circumferentially fixed to the anti-rotation hole 11.

[0098] The deformation section 33 of the main body 32 may have a hexagonal cross section, and the anti-rotation hole 11 may be a hexagonal hole that matches the deformation section 33, and the two are fitted together to achieve circumferential fixation. The through hole 23 of the connecting plate 20 may be circular, and its diameter should be larger than the size of the main body 32. The diameter of the through hole 23 should be larger than the anti-rotation hole 11 to ensure that there is enough clearance to adjust the relative position of the rivet bolt and the connecting plate 20. In this way, the anti-rotation setting of the main body 32 and the bottom plate 10 can be ensured and the main body 32 and the connecting plate 20 can be prevented from being over-positioned, which is convenient for assembly.

[0099] In some possible embodiments, see Figures 5 to 9 As shown, the connecting plate 20 includes a first adhesive layer 21, and the first adhesive layer 21 is arranged on a side of the connecting plate 20 facing the bottom plate 10. The first adhesive layer 21 is located between the bottom plate 10 and the plate body of the connecting plate 20, and can achieve a sealing function.

[0100] In addition, the connecting plate 20 may further include a second adhesive layer 22, which is disposed on a side of the connecting plate 20 facing away from the bottom plate 10. The second adhesive layer 22 is located between the step portion 31 and the plate body of the connecting plate 20, and can achieve a sealing function.

[0101] It should be noted that when the size of the assembly composed of the connecting plate 20 and the bottom plate 10 is designed, the thickness of each part should be controlled to ensure the fit. The first adhesive layer 21 is sprayed on the upper plate of the connecting plate 10, and its maximum thickness is 0.31 mm; the second adhesive layer 22 is sprayed on the lower plate of the connecting plate 10, and its maximum thickness is 0.25 mm. The thickness e1 of the connecting plate 10 is the sum of the above thicknesses.

[0102] Optionally, the first adhesive layer 21 and the second adhesive layer 22 may be structural sealants, such as polyurethane structural adhesive, acrylic structural adhesive, etc.

[0103] The present application provides a battery device, including: a box body 110 , a battery cell 121 , a connecting plate 20 and at least one connecting member 30 .

[0104] The box 110 has a storage space; the battery cell 121 is stored in the storage space of the box 110. The connecting plate 20 is a heat exchange plate, and the connecting plate 20 is attached to the bottom plate 10 of the box 110; the first adhesive layer 21 is arranged on the side of the connecting plate 20 facing the bottom plate 10, and the second adhesive layer 22 is arranged on the side of the connecting plate 20 facing away from the bottom plate 10. The thickness of the connecting plate 20 is 2.0mm-3.5mm.

[0105] The connecting member 30 is a riveted nut. The connecting member 30 includes a step portion 31 and a main body portion 32. The main body portion 32 is disposed on the step portion 31; the step portion 31 is attached to the side of the connecting plate 20 away from the bottom plate 10, and the main body portion 32 passes through the connecting plate 20 and the bottom plate 10 in sequence.

[0106] The main body 32 includes a deformable section 33 and a connecting section 34. The length of the deformable section 33 is 7mm-8mm; the length of the connecting section 34 is 3.5mm-5mm. The deformable section 33 is connected to the step portion 31 through the connecting section 34; a part of the deformable section 33 passes through the bottom plate 10, and another part of the deformable section 33 is located in the bottom plate 10; a part of the connecting section 34 is located in the bottom plate 10, and another part of the connecting section 34 is located in the connecting plate 20; a plurality of grooves 331 are formed on the side wall of the deformable section 33.

[0107] The cross-section of the main body 32 is hexagonal; the main body 32 includes a step protrusion 35, which is arranged on the connecting section 34; the main body 32 forms a cavity 36, and the cavity 36 forms an opening at one end of the main body 32 close to the step portion 31; the end of the cavity 36 away from the opening is provided with an internal thread 37, and the internal thread 37 extends upward into the range of the deformation section 33.

[0108] The thickness of the bottom plate 10 is 1.8 mm-3.2 mm; the bottom plate 10 is formed with an anti-rotation hole 11 , and the deformation section 33 is circumferentially fixed to the anti-rotation hole 11 .

[0109] The thickness of the connecting plate 20, the length of the connecting section 34, the sum of the thickness of the bottom plate 10 and the connecting plate 20, and the sum of the length of the deformation section 33 and the connecting section 34 increase in sequence. Specifically, when the size of the component composed of the connecting plate 20 and the bottom plate 10 is designed, the thickness of each part should be controlled to ensure adaptation. The thickness of the bottom plate 10 is e2, and the range of e2 is 1.8mm-3.2mm. The connecting plate 20 is attached to the bottom plate 10, and the thickness of the connecting plate 2 is e1, and the range of e1 is 2.0mm-3.5mm. The length of the deformation section 33 is S, and the range of S is 7mm-8mm; the length of the connecting section 34 is E, and the range of E is 3.5mm-5mm, and e1≤E≤e1+e2≤E+S is satisfied.

[0110] By setting the thickness of the connecting plate 20, the length of the connecting section 34, and the sum of the thickness of the bottom plate 10 and the connecting plate 20 to increase in sequence, the tolerance range that the connecting piece 30 can adapt to is effectively improved, so that after the bottom plate 10, the connecting plate 20 and the connecting piece 30 are assembled, the top of the deformation section 33 that is easier to deform is always within the thickness range of the bottom plate 10, thereby ensuring that the deformation section 33 will not deform within the range of the connecting plate 20, thereby avoiding damage to the connecting plate 20, and making the connection quality of the assembly composed of the connecting plate 20 and the bottom plate 10 more stable; in addition, by setting the sum of the thickness of the bottom plate 10 and the connecting plate 20, and the deformation section 33 and the connecting piece 3 ... deformation section 33 and the connecting piece 30 are increased in sequence, and the deformation section 33 and the connecting piece 30 are increased in sequence, and the deformation section 33 and the connecting piece 30 are increased in sequence, and the deformation section 33 and the connecting piece 30 are increased in sequence, and the deformation section 33 and the connecting piece 30 are increased in sequence, and the deformation section 33 and the connecting piece 30 are increased in sequence, and The sum of the lengths of the connecting sections 34 increases successively, ensuring that the bottom end of the deformation section 33 which is more easily deformed is located outside the thickness range of the bottom plate 10. In this way, the deformation section 33 will bulge and deform before the connecting section 34, and ensure that the bulging deformation area 33a is located outside the thickness range of the bottom plate 10, so that the connector 30 can adapt to the bottom plate 10 and the connecting plate 20 with a larger plate thickness tolerance. Finally, the deformation section 33 is controlled to deform in the section passing through the bottom plate 10 so as to cooperate with the step portion 31 to achieve axial limitation, thereby completing the fixation of the bottom plate 10 and the connecting plate 20, so that the connection quality of the assembly consisting of the connecting plate 20 and the bottom plate 10 is more stable.

[0111] A second aspect of the present application provides an electrical device. Figures 1 to 9 As shown, the electrical device includes the above-mentioned battery device, and the battery device is used to provide electrical energy to the electrical device.

[0112] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery device, characterized in that: The battery device comprises: A box body (110) having a receiving space; A battery cell (121) is accommodated in the accommodation space; A connecting plate (20) is attached to the bottom plate (10) of the box body (110); and at least one connecting member (30), the connecting member (30) comprising a step portion (31) and a main body portion (32), the main body portion (32) being arranged on the step portion (31); The step portion (31) is attached to a side of the connecting plate (20) facing away from the bottom plate (10), and the main body portion (32) passes through the connecting plate (20) and the bottom plate (10) in sequence; The main body (32) comprises a deformable section (33) and a connecting section (34), wherein the deformable section (33) is connected to the step section (31) via the connecting section (34); in the absence of external restraint and under the same external force, the deformable section (33) will deform first, while the connecting section (34) will remain unchanged; The thickness of the connecting plate (20), the length of the connecting section (34), the sum of the thickness of the bottom plate (10) and the connecting plate (20), and the sum of the length of the deformation section (33) and the connecting section (34) increase in sequence; A portion of the deformation section (33) passes through the bottom plate (10), and another portion of the deformation section (33) is located inside the bottom plate (10); A portion of the connecting section (34) is located in the bottom plate (10), and another portion of the connecting section (34) is located in the connecting plate (20).

2. The battery device according to claim 1, characterized in that: The main body (32) comprises a step protrusion (35), and the step protrusion (35) is arranged on the connecting section (34).

3. The battery device according to claim 1 or 2, characterized in that: The cross section of the main body (32) is hexagonal.

4. The battery device according to claim 1 or 2, characterized in that: A plurality of grooves (331) are formed on the side wall of the deformation section (33).

5. The battery device according to claim 1 or 2, characterized in that: A plurality of convex strips are formed on the side wall of the connecting section (34).

6. The battery device according to claim 1 or 2, characterized in that: The connecting piece (30) is a riveted nut.

7. The battery device according to claim 6, characterized in that: The main body (32) is formed with a cavity (36), and the cavity (36) is formed with an opening at one end of the main body (32) close to the step portion (31); an internal thread (37) is provided at one end of the cavity (36) away from the opening, and the internal thread (37) extends upward into the range of the deformation section (33).

8. The battery device according to claim 1 or 2, characterized in that: The bottom plate (10) is formed with an anti-rotation hole (11), and the connecting plate (20) is formed with a through hole (23) corresponding to the anti-rotation hole (11); the main body (32) passes through the through hole (23) and the anti-rotation hole (11) in sequence; The deformation section (33) is circumferentially fixed to the anti-rotation hole (11); and the diameter of the through hole (23) is larger than that of the anti-rotation hole (11).

9. The battery device according to claim 1 or 2, characterized in that: The connecting plate (20) is a heat exchange plate.

10. The battery device according to claim 1 or 2, characterized in that: The connecting plate (20) comprises a first adhesive layer (21), the first adhesive layer (21) being arranged on a side of the connecting plate (20) facing the bottom plate (10); and / or the connecting plate (20) comprises a second adhesive layer (22), the second adhesive layer (22) being arranged on a side of the connecting plate (20) facing away from the bottom plate (10).

11. The battery device according to claim 1 or 2, characterized in that: The thickness of the connecting plate (20) is 2.0 mm to 3.5 mm; The thickness of the bottom plate (10) is 1.8 mm to 3.2 mm; The length of the deformation section (33) is 7 mm to 8 mm; The length of the connecting section (34) is 3.5 mm-5 mm.

12. An electrical device, characterized in that: The invention comprises a battery device as claimed in any one of claims 1 to 11, wherein the battery device is used to provide electrical energy.

Images