Battery and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery and an electric device. The battery comprises a lower box body, a battery module and a pressing strip; the lower box body is provided with an accommodating space; the battery module is arranged in the accommodating space; the pressing strip is positioned on one side, deviating from the bottom surface of the lower box body, of the battery module and is used for applying pressure towards the bottom surface to the battery module; the pressing strip is provided with a contact part and a reinforcing part, at least one of the contact part and the reinforcing part is connected with the lower box body, the contact part makes contact with the lower box body, and the reinforcing part is connected with the contact part and used for reinforcing the mechanical strength of the contact part. According to the battery and the power utilization device provided by the invention, the risk that the joint of the pressing strip and the lower box body is damaged can be reduced to a certain extent.

Description

Technical Field

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

[0002] Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of power battery application areas, its market demand is also constantly expanding.

[0003] Currently, a pressure strip is provided in the battery to apply pressure to the battery cell toward the lower box body. However, the current pressure strip has a simple structure and the connection between the pressure strip and the lower box body is easy to tear. Utility Model Content

[0004] In view of the above problems, the present application provides a battery and an electrical device, aiming to improve the technical problem of easy tearing at the connection between the pressure strip and the lower box body.

[0005] In the first aspect, an embodiment of the present application provides a battery, comprising: a lower box body having a accommodating space; a battery module disposed in the accommodating space; and a pressure strip located on the side of the battery module away from the bottom surface of the lower box body, for applying pressure toward the bottom surface to the battery module; the pressure strip has a contact portion and a reinforcement portion, at least one of the contact portion and the reinforcement portion is connected to the lower box body, the contact portion and the lower box body are in contact with each other, and the reinforcement portion is connected to the contact portion for strengthening the mechanical strength of the contact portion.

[0006] The battery provided in the embodiment of the present application includes a lower case, a battery module and a pressure strip, and the pressure strip has a contact portion and a reinforcement portion. The reinforcement portion and the contact portion are used to enhance the mechanical strength of the contact portion, which can effectively improve the mechanical strength of the contact portion between the pressure strip and the lower case (i.e., the contact portion), reduce the risk of damage to the connection between the pressure strip and the lower case under vibration conditions and battery expansion conditions, and at the same time enhance the structural strength of the combined structure composed of the lower case and the pressure strip, and improve the stability of the battery structure.

[0007] In some embodiments, the mechanical strength of the reinforcing portion is greater than that of the contact portion. With this solution, the mechanical strength of the combined structure formed by the reinforcing portion and the contact portion can be excellent, thereby reducing the risk of tearing of the portion during use.

[0008] In some embodiments, the reinforcing part is a plate-shaped structure. With this structure, the reinforcing part has a simple structure and is easy to process and assemble.

[0009] In some embodiments, the reinforcing portion includes: a first division connected to the contact portion; and a second division located outside the contact portion and arranged at an angle to and connected to the first division, and the second division is also connected to the lower box. With this structure, the connection between the pressure strip and the lower box is no longer located in the area corresponding to the contact portion, but can be transferred to the outside of the main structure of the pressure strip, that is, one side of the lower box. When used in this way, if the battery cell expands, the expansion force pushes the expansion beam outward, and the expansion beam applies an outward thrust to the second division, and then the thrust can be transmitted through the second division, in turn, through the connection between the second division and the first division, and through the first division to the contact portion and the main structure of the pressure strip. In this way, the connection between the second division and the lower box is almost not passed during the entire force-bearing process. At this time, since the pressure strip is connected to the lower box body through the second section, the position where the hole needs to be punched on the pressure strip is also transferred from the contact part to the second section, and the axis of the installation hole is no longer perpendicular to the above-mentioned expansion force, but parallel to the above-mentioned expansion force, so that the thrust of the expansion force on the second section is no longer to move the connecting piece between the lower box body and the pressure strip toward the radial direction of the installation hole, which can reduce the force on the installation hole, so that the hole margin of the installation hole opened on the second section can be reduced. In addition, since in the above process, the force path almost does not pass through the connection between the second section and the lower box body, and except for the above-mentioned connection, other parts of the pressure strip do not need to be punched, this can improve the structural strength of the pressure strip to a certain extent, and further reduce the risk of tearing at the connection between the pressure strip and the lower box body during use.

[0010] In some embodiments, the reinforcement part is an integrally formed structure. The reinforcement part adopts the structure provided by this embodiment, which is easy to process and can make the structure of the reinforcement part stable.

[0011] In some embodiments, the reinforcement part is a metal part. By adopting the solution provided by this embodiment, the mechanical strength of the reinforcement part can be excellent.

[0012] In some embodiments, the contact portion is provided with a groove, and the reinforcing portion is provided in the groove. The structure provided in this embodiment can reduce the risk of the reinforcing portion contacting the pole in the battery cell to a certain extent, thereby improving the electrical safety of the battery.

[0013] In some embodiments, the pressure strip further includes: a main body, the end of which is the contact part; and a connecting part, which is arranged between the contact part and the reinforcement part, and is used to connect the contact part and the reinforcement part, and is also used to transmit the force of the contact part to the reinforcement part. With this structure, the force of the contact part can be stably transmitted to the reinforcement part, so as to reduce the risk of tearing of the contact part.

[0014] In some embodiments, the main body is a solid structure or a hollow structure. The main body is a solid structure, which can make the main body easy to process and have excellent mechanical strength, which meets the needs of use. The main body is a hollow structure, which can make the weight of the main body smaller, which is convenient for reducing the overall weight of the battery.

[0015] In some embodiments, the main body includes: a first plate, the first plate is in contact with the battery module; a second plate is arranged opposite to the first plate; and a third plate connects the second plate and the first plate. With this structure, the main body is a hollow structure, which is simple and easy to process.

[0016] In some embodiments, the third plate bodies are provided with three, the two third plate bodies at the edges form a closed space with the first plate body and the second plate body, and the third plate body in the middle divides the closed space into two sub-cavities. Compared with two third plate bodies, the solution provided in this embodiment can make the mechanical strength of the middle area of ​​the main body greater.

[0017] In some embodiments, the main body is an integrally formed structure. By adopting the solution provided in this embodiment, the structure of the main body can be stabilized.

[0018] In some embodiments, the main body is made of insulating material. By adopting the solution provided in this embodiment, the insulation of the main body can be improved, thereby improving the electrical safety of the battery to a certain extent.

[0019] In some embodiments, the insulating material includes at least one of a fiber-reinforced thermosetting composite material and a fiber-reinforced thermoplastic material, so that the main body has good insulation performance and can effectively ensure the electrical safety of the battery.

[0020] In some embodiments, the connection portion includes an adhesive layer. By adopting the structure provided in this embodiment, the connection area between the contact portion and the reinforcement portion can be large, and the force on the contact portion can be evenly transmitted to the reinforcement portion.

[0021] In some embodiments, the surface of the bonding layer is a rough surface. In this way, the contact area between the bonding layer and the reinforcement part and the contact part can be increased to a certain extent, and the bonding force between the reinforcement part and the bonding layer and between the contact part and the bonding layer can be increased. Through the bonding strength between the reinforcement part, the contact part and the bonding layer, the stress on the contact part can be effectively evenly dispersed to the connection area between the reinforcement part and the bonding layer and the various areas of the reinforcement part during use, so as to achieve the purpose of enhancing the mechanical strength of the contact part.

[0022] In some embodiments, the battery module includes multiple groups of battery cells arranged along the first direction; the same pressure strip contacts two adjacent groups of battery cells. Compared with the same pressure strip contacting only one group of battery cells, the solution provided in this embodiment can improve the utilization rate of the same pressure strip to a certain extent, reduce the number of pressure strips in the battery, reduce the number of parts in the battery, and facilitate assembly.

[0023] In some embodiments, the pressure strip contacts the first portion of the battery cell, the first portion including the pole of the battery cell and / or the portion between the pole and the side of the battery cell. The pressure strip contacts the first portion of the battery cell without affecting the normal assembly and use of the battery cell.

[0024] In some embodiments, the pressure strip is a strip-shaped portion and is arranged along the first direction. The solution provided by this embodiment makes the pressure strip simple in structure and easy to assemble.

[0025] In some embodiments, the battery further comprises: a connector for connecting the pressure strip and the lower box. The solution provided in this embodiment is adopted to facilitate the connection between the pressure strip and the lower box.

[0026] In some embodiments, the connecting member includes a rivet nut, and the pressure strip and the lower box are clamped by the rivet nut; or, the connecting member includes a rivet nut arranged on the lower box, and a bolt connecting the pressure strip and the rivet nut. The connecting member adopts the structure provided by this embodiment, has excellent connection performance, and is easy to process.

[0027] In the second aspect, the embodiment of the present application provides an electrical device, including the battery provided by any of the above embodiments. The electrical device provided by the embodiment of the present application, including the battery provided by any of the above embodiments, can effectively improve the mechanical strength of the contact portion (i.e., the contact portion) between the pressure strip and the lower box body, reduce the risk of damage to the connection between the pressure strip and the lower box body under vibration conditions and battery expansion conditions, and at the same time can enhance the structural strength of the combined structure composed of the lower box body and the pressure strip, and improve the stability of the battery structure.

[0028] 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

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0030] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0031] Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0032] Figure 3 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0033] Figure 4 A schematic diagram of a partial structure of a battery according to some embodiments of the present application;

[0034] Figure 5 for Figure 4 A schematic diagram of the enlarged local structure at point A in the middle;

[0035] Figure 6 A schematic diagram of a partial structure of a pressure strip in a battery in some embodiments of the present application;

[0036] Figure 7 for Figure 6 Schematic diagram of the explosion structure of the middle layer;

[0037] Figure 8 Schematic diagram of the partial structure of batteries of other embodiments of the present application;

[0038] Fig. 9 for Figure 8 Structural schematic diagram of the middle reinforcement part;

[0039] Fig.10 Schematic diagram of the partial cross-sectional structure of batteries according to other embodiments of the present application.

[0040] The reference numerals in the specific implementation manner are as follows:

[0041] 1000. Vehicles;

[0042] 100, battery; 200, controller; 300, motor;

[0043] 10. Box body; 11. Lower box body; 12. Upper box body;

[0044] 20. Battery cell; 21. End cover; 21a. Post; 22. Shell; 23. Battery cell;

[0045] 30. Battery module;

[0046] 40, pressure strip; 40a, contact portion; 41, main body; 42, reinforcement portion; 43, connecting portion; 44, groove;

[0047] 411, first plate; 412, second plate; 413, third plate; 421, first subsection; 422, second subsection;

[0048] 50. Connectors;

[0049] X, first direction. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] 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 "multiple" is more than two, unless otherwise clearly and specifically defined.

[0053] 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.

[0054] 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.

[0055] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0056] In the description of the embodiments of the present application, the technical 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do 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 should not be understood as a limitation on the embodiments of the present application.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral 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.

[0058] 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 military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0059] Batteries are often subjected to vibration and shock during factory testing and actual use. During the battery charging and discharging process, they will also experience expansion. Under these conditions, the joints and welds of the battery's internal structure are easily damaged. Therefore, how to improve the stability and safety of the battery under vibration is one of the research focuses in this field.

[0060] In order to improve the stability and safety of the battery under conditions such as vibration and expansion, in the related art, a pressure strip is added to the battery, which is used to apply pressure to the battery cells in the battery toward the lower case. However, the current pressure strip has a simple structure, generally an integrally formed strip structure, with an opening at the end connected to the lower case. Under vibration conditions and battery expansion conditions, the opening is prone to cracking due to tension, resulting in structural failure.

[0061] To improve the above-mentioned problems, an embodiment of the present application provides a battery, which includes a lower case, a battery module and a pressure strip, wherein the pressure strip has a contact portion and a reinforcement portion, and the reinforcement portion and the contact portion are used to enhance the mechanical strength of the contact portion, thereby effectively improving the mechanical strength of the contact portion between the pressure strip and the lower case (i.e., the contact portion), reducing the risk of damage to the connection between the pressure strip and the lower case under vibration conditions and battery expansion conditions, and at the same time enhancing the structural strength of the combined structure composed of the lower case and the pressure strip, thereby improving the stability of the battery structure.

[0062] The battery disclosed in the embodiments of the present application can be used in an electrical device that uses the battery as a power source or in various energy storage systems that use the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0063] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0064] Please refer to Figure 1 The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. 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. 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. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0065] 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.

[0066] Please refer to Figure 2The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. Among them, the case 10 is used to provide a storage space for the battery cell 20, and the case 10 can adopt a variety of structures. In some embodiments, the case 10 may include a lower case 11 and an upper case 12, and the lower case 11 and the upper case 12 cover each other. Generally, the lower case 11 has a storage space, and the upper case 12 can be a plate-like structure or a hollow structure with one side open. The case 10 formed by the lower case 11 and the upper case 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0067] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0068] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0069] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. Figure 3 The battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23 and other functional components.

[0070] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as poles 21a can be provided on the end cap 21. The pole 21a can be used to electrically connect with the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0071] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 and the end cap 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 21 at the opening. Without limitation, the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cap 21 covers the shell 22. The shell 22 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 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, 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.

[0072] The electrode assembly 23 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 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, and the parts of the positive and negative electrode sheets without active materials each constitute a pole ear. 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 ears connect the poles to form a current loop.

[0073] like Figure 4 and Figure 5 As shown, an embodiment of the present application provides a battery 100, which includes a lower box body 11, a battery module 30 and a pressure strip 40. Among them, the lower box body 11 has a accommodating space. The battery module 30 is arranged in the accommodating space. The pressure strip 40 is located on the side of the battery module 30 away from the bottom surface of the lower box body 11, and is used to apply pressure toward the bottom surface to the battery module 30. The pressure strip 40 has a contact portion 40a and a reinforcing portion 42. At least one of the contact portion 40a and the reinforcing portion 42 is connected to the lower box body 11. The contact portion 40a is in contact with the lower box body 11. The reinforcing portion 42 is connected to the contact portion 40a, and is used to strengthen the mechanical strength of the contact portion 40a.

[0074] In this embodiment, the lower box 11 is a hollow structure with one side open, and its inner wall encloses the above-mentioned accommodation space. The volume of the accommodation space is generally larger than the volume of the battery module 30. The battery module 30 is formed by connecting multiple batteries 100 in series, in parallel or in mixed connection. One battery module 30 or multiple battery modules 30 can be placed in the accommodation space, which can be determined according to the specific use needs.

[0075] The pressure strip 40 is generally a long strip structure, but can also be other structures, and is generally made of non-metallic materials (such as plastic, composite materials, etc.), but can also be made of other materials, depending on the specific use needs. The length of the pressure strip 40 is generally greater than the length of a single battery module 30, and the length of a single pressure strip 40 can also be less than the length of a single battery module 30. When in use, multiple pressure strips 40 are spliced ​​together to apply pressure to the same battery module 30.

[0076] The contact portion 40a and the reinforcing portion 42 are both part of the pressure strip 40, and both are generally located at the end of the pressure strip 40. At least one of the contact portion 40a and the reinforcing portion 42 is connected to the lower box body 11, including the following situations: the first situation, only the contact portion 40a is connected to the lower box body 11; the second situation, only the reinforcing portion 42 is connected to the lower box body 11; the third situation, both the contact portion 40a and the reinforcing portion 42 are connected to the lower box body 11. It can be understood that when the contact portion 40a is connected to the lower box body 11, the contact portion 40a and the lower box body 11 are in contact with each other, which means that the contact portion 40a and the lower box body 11 are in contact and connected; when the contact portion 40a and the lower box body 11 are not connected, the contact portion 40a and the lower box body 11 are in contact with each other, which means that the contact portion 40a and the lower box body 11 are only in contact but not connected.

[0077] The mechanical strength includes but is not limited to tensile strength, rigidity, fracture strength, etc. The reinforcing portion 42 is connected to the contact portion 40a to enhance the mechanical strength of the contact portion 40a. This means that the reinforcing portion 42 and the contact portion 40a may be directly or indirectly connected. Regardless of the method, the provision of the reinforcing portion 42 can enhance the mechanical strength of the contact portion 40a.

[0078] The force-bearing principle of the battery 100 provided by the embodiment of the present application is as follows:

[0079] During assembly, the battery module 30 is first placed in the accommodating space of the lower box body 11, and then the pressure strip 40 is placed on the upper surface of the battery module 30, and the pressure strip 40 is connected to the expansion beam of the lower box body 11 through the reinforcement portion 42 and / or the contact portion 40a of the pressure strip 40, and then the upper box body 12 is installed to obtain the battery 100.

[0080] In the above operation, the contact portion 40a is generally placed on the expansion beam, and the connection between the pressure strip 40 and the lower box 11 can be provided by opening mounting holes on the contact portion 40a and the expansion beam, and fixing them by bolts, rivet nuts, etc. Due to the provision of the reinforcement portion 42, the mechanical strength of the contact portion 40a is increased, so that when the battery 100 is vibrated or expanded, the expansion beam applies an outward tensile force to the contact portion 40a or the battery 100 applies an upward thrust to the pressure strip 40, the risk of tearing at the opening of the contact portion 40a can also be reduced.

[0081] The battery 100 provided in the embodiment of the present application includes a lower case 11, a battery module 30 and a pressure strip 40, wherein the pressure strip 40 has a contact portion 40a and a reinforcing portion 42, wherein the reinforcing portion 42 is used to enhance the mechanical strength of the contact portion 40a, thereby effectively improving the mechanical strength of the contact portion between the pressure strip 40 and the lower case 11 (i.e., the contact portion 40a), reducing the risk of damage to the connection between the pressure strip 40 and the lower case 11 under vibration conditions and battery expansion conditions, and at the same time enhancing the structural strength of the combined structure composed of the lower case 11 and the pressure strip 40, thereby improving the stability of the structure of the battery 100.

[0082] In some embodiments, the mechanical strength of the reinforcing portion 42 is greater than the mechanical strength of the contact portion 40 a .

[0083] It can be understood that, since mechanical strength generally has multiple parameters, for the sake of comparison, the mechanical strength of the above-mentioned reinforcement portion 42 and the mechanical strength of the contact portion 40a are the same parameter. For example, when the mechanical strength includes tensile strength and stiffness, the mechanical strength of the above-mentioned reinforcement portion 42 is greater than the mechanical strength of the contact portion 40a, which means that the tensile strength of the reinforcement portion 42 is greater than the tensile strength of the contact portion 40a, and the stiffness of the reinforcement portion 42 is greater than the stiffness of the contact portion 40a.

[0084] By adopting this solution, the mechanical strength of the combined structure formed by the reinforcing portion 42 and the contact portion 40a can be excellent, thereby reducing the risk of tearing during use.

[0085] like Figure 6 and Figure 7 As shown, in some embodiments, the reinforcement portion 42 is a plate-shaped structure.

[0086] With this structure, the reinforcing portion 42 has a simple structure and is easy to process and assemble.

[0087] like Figure 8 and Fig. 9 As shown, in some embodiments, the reinforcement portion 42 includes a first sub-portion 421 and a second sub-portion 422. The first sub-portion 421 is connected to the contact portion 40a. The second sub-portion 422 is located outside the contact portion 40a, and is arranged at an angle with and connected to the first sub-portion 421. The second sub-portion 422 is also connected to the lower box body 11.

[0088] The first sub-portion 421 and the second sub-portion 422 are both part of the reinforcing portion 42, and the two can be separately provided or integrally provided, depending on the use requirements. The structures of the first sub-portion 421 and the second sub-portion 422 can be the same or different, such as the first sub-portion 421 and the second sub-portion 422 can both be plate-shaped structures, or one can be a plate-shaped structure and the other a block-shaped structure.

[0089] The second section 422 and the first section 421 are arranged at an angle, which means that adjacent surfaces of the two sections are arranged at an angle, and the angle is a non-zero angle, which can be an acute angle or an obtuse angle, and can be determined according to usage requirements.

[0090] With this structure, the connection between the pressure strip 40 and the lower box 11 is no longer located in the area corresponding to the contact portion 40a, but can be transferred to the outside of the main structure of the pressure strip 40, that is, to one side of the lower box 11. When used in this way, if the battery cell 20 expands, the expansion force pushes the expansion beam outward, and the expansion beam applies an outward thrust to the second subsection 422. Then, the thrust can be transmitted to the contact portion 40a and the main structure of the pressure strip 40 through the second subsection 422, the connection between the second subsection 422 and the first subsection 421, and the first subsection 421 in sequence. In this way, during the entire force-bearing process, the connection between the second subsection 422 and the lower box 11 is almost not passed. At this time, since the pressure strip 40 is connected to the lower box body 11 through the second subsection 422, the position where the hole needs to be punched on the pressure strip 40 is also transferred from the contact portion 40a to the second subsection 422, and the axis of the mounting hole is no longer perpendicular to the above-mentioned expansion force, but parallel to the above-mentioned expansion force, so that the thrust of the expansion force acting on the second subsection 422 is no longer to move the connecting member 50 between the lower box body 11 and the pressure strip 40 toward the radial direction of the mounting hole, so that the force on the mounting hole can be reduced, so that the hole margin of the mounting hole opened on the second subsection 422 can be reduced. The above-mentioned hole margin is the distance between the hole wall of the mounting hole and the side wall of the second subsection 422. In the above process, the force path almost does not pass through the connection between the second subsection 422 and the lower box body 11, and except for the above-mentioned connection, other parts of the pressure strip 40 do not need to be punched, so that the structural strength of the pressure strip 40 can be improved to a certain extent, and the risk of tearing at the connection between the pressure strip 40 and the lower box body 11 during use can be further reduced.

[0091] like Fig. 9 As shown, in some embodiments, the first section 421 and the second section 422 form an L-shaped structure, which is fixed to the side elevation of the expansion beam through a downward-folding structure, thereby reducing the hole margin after opening and reducing the adverse effect on the strength of the second section 422. During the expansion of the battery cell 20, the expansion force acts on the connection between the second section 422 and the first section 421, that is, the bending area of ​​the reinforcement section 42, which can further improve the structural strength.

[0092] In some embodiments, the reinforcement portion 42 is an integrally formed structure.

[0093] The one-piece molded structure refers to a structure made by one-piece molding processes such as injection molding and compression molding.

[0094] The reinforcing portion 42 adopts the structure provided in this embodiment, which is easy to process and can make the structure of the reinforcing portion 42 stable.

[0095] In some embodiments, the reinforcement portion 42 is a metal portion.

[0096] The reinforcing portion 42 being a metal portion means that the reinforcing portion 42 is made of a metal material, such as at least one material such as an aluminum alloy or a steel material.

[0097] By adopting the solution provided in this embodiment, the mechanical strength of the reinforcement portion 42 can be improved.

[0098] like Figures 6 to 8 As shown, in some embodiments, the contact portion 40 a is provided with a groove 44 , and the reinforcement portion 42 is provided in the groove 44 .

[0099] The groove 44 is a groove on the surface of the contact portion 40a. The groove 44 can be made by an integral molding process, or by cutting, molding, or the like after the contact portion 40a is formed. The reinforcement portion 42 is disposed in the groove 44, and a portion of the reinforcement portion 42 can be located in the groove 44, such as Figure 8 As shown, the entire reinforcement portion 42 may also be located within the groove 44, as shown in FIG. Figure 6 shown.

[0100] By adopting the structure provided in this embodiment, the risk of the reinforcing portion 42 contacting the pole in the battery cell 20 can be reduced to a certain extent, thereby improving the electrical safety of the battery 100 .

[0101] like Figure 7 As shown, in some embodiments, the pressure strip 40 further includes a main body portion 41 and a connecting portion 43 .

[0102] The end of the main body 41 is the contact portion 40 a. The connecting portion 43 is disposed between the contact portion 40 a and the reinforcing portion 42 for connecting the contact portion 40 a and the reinforcing portion 42 and for transmitting the force of the contact portion 40 a to the reinforcing portion 42 .

[0103] The main body 41 and the connecting part 43 are both part of the pressure strip 40, wherein the main body 41 occupies most of the pressure strip 40, generally all of the pressure strip 40 except the contact part 40a, the reinforcement part 42, and the connecting part 43. The connecting part 43 is a connecting structure between the contact part 40a and the reinforcement part 42.

[0104] With this structure, the force on the contact portion 40a can be stably transmitted to the reinforcing portion 42, thereby reducing the risk of the contact portion 40a being torn.

[0105] In some embodiments, the main body 41 is a solid structure or a hollow structure.

[0106] The solid structure means that the space surrounded by the outer surface of the main body 41 is filled with materials. The hollow structure means that the space surrounded by the outer wall of the main body 41 is a cavity.

[0107] The main body 41 adopts a solid structure, which can make the main body 41 easy to process and have excellent mechanical strength to meet the use requirements. The main body 41 adopts a hollow structure, which can make the main body 41 lighter and reduce the overall weight of the battery 100.

[0108] like Figure 6 As shown, in some embodiments, the main body 41 includes a first plate 411, a second plate 412 and a third plate 413. The first plate 411 contacts the battery module 30. The second plate 412 is disposed opposite to the first plate 411. The third plate 413 connects the second plate 412 and the first plate 411.

[0109] The first plate 411, the second plate 412, and the third plate 413 are all components of the main body 41. The three are generally of equal length, but can also be set to different lengths according to the needs of use. The three can be integrally formed, or connected together by glue, bolts, etc. Among them, the structure and size of the first plate 411 and the second plate 412 can be exactly the same or different, depending on the specific needs of use. The third plate 413 can be set to one or more, depending on the specific needs of use.

[0110] By adopting this structure, the main body 41 is a hollow structure, which is simple and easy to process.

[0111] In some embodiments, three third plates 413 are provided, and two third plates 413 located at the edges form a closed space with the first plate 411 and the second plate 412 , and the third plate 413 located in the middle divides the closed space into two sub-cavities.

[0112] A closed space is a space that is open at both ends and closed in the middle.

[0113] Compared with two third plates 413 , the solution provided in this embodiment can make the mechanical strength of the middle area of ​​the main body 41 greater.

[0114] In some embodiments, the main body 41 is an integrally formed structure.

[0115] By adopting the solution provided in this embodiment, the structure of the main body 41 can be stabilized.

[0116] In some embodiments, the main body 41 is made of insulating material.

[0117] The insulating material refers to a material used to electrically insulate the main body 41 , and may be plastic, a composite material, or the like.

[0118] By adopting the solution provided in this embodiment, the insulation property of the main body 41 can be improved, thereby improving the electrical safety of the battery 100 to a certain extent.

[0119] In some embodiments, the insulating material includes at least one of a fiber reinforced thermoset composite material and a fiber reinforced thermoplastic material.

[0120] The insulating material includes at least one of fiber-reinforced thermosetting composite materials and fiber-reinforced thermoplastic materials, including but not limited to the following situations: first, the insulating material only includes fiber-reinforced thermosetting composite materials; second, the insulating material includes other materials in addition to fiber-reinforced thermosetting composite materials, but the other materials do not include fiber-reinforced thermoplastic materials; third, the insulating material only includes fiber-reinforced thermoplastic materials; fourth, the insulating material includes other materials in addition to fiber-reinforced thermoplastic materials, but the other materials do not include fiber-reinforced thermosetting composite materials; fifth, the insulating material includes fiber-reinforced thermosetting composite materials and fiber-reinforced thermoplastic materials.

[0121] The fiber-reinforced thermosetting composite material is a composite material, that is, a material composed of two or more components, which are chemically separated from each other on a macroscopic level and have interfaces between the components.

[0122] The fiber-reinforced thermosetting composite material may be fiber-reinforced epoxy resin or fiber-reinforced polyurethane, etc., and the fiber-reinforced thermoplastic material may be polyamide (PA), polyphenylene sulfide (PPS), etc. This allows the main body 41 to have good insulation properties, which can effectively ensure the electrical safety of the battery 100.

[0123] In some embodiments, the connection portion 43 includes an adhesive layer.

[0124] The bonding layer is generally one or more adhesive layers.

[0125] By adopting the structure provided in this embodiment, the connection area between the contact portion 40 a and the reinforcement portion 42 can be increased, and the force applied to the contact portion 40 a can be evenly transmitted to the reinforcement portion 42 .

[0126] In some embodiments, the surface of the adhesive layer is rough.

[0127] Rough surface is also called concavoconvex body, which refers to the uneven surface of the bonding layer. The surface of the bonding layer is rough surface, which means that the contact surface between the bonding layer and the reinforcement 42, and the contact surface between the bonding layer and the contact portion 40a are rough surfaces. In this way, the contact area between the bonding layer and the reinforcement 42 and the contact portion 40a can be increased to a certain extent, and the bonding force between the reinforcement 42 and the bonding layer and between the contact portion 40a and the bonding layer can be increased. Through the bonding strength between the reinforcement 42, the contact portion 40a and the bonding layer, the stress received by the contact portion 40a can be effectively evenly dispersed to the connection area between the reinforcement 42 and the bonding layer and the various areas of the reinforcement 42 when in use, so as to achieve the purpose of enhancing the mechanical strength of the contact portion 40a.

[0128] In some embodiments, the battery module 30 includes multiple groups of battery cells 20 arranged along a first direction X. The same pressure strip 40 contacts two adjacent groups of battery cells 20. The first direction X is generally the thickness direction of the battery cell 20, and may also be other directions, such as a direction forming an acute angle with the thickness direction, which may be determined according to usage requirements.

[0129] Compared with the same pressure strip 40 only contacting one group of battery cells 20, the solution provided in this embodiment can improve the utilization rate of the same pressure strip 40 to a certain extent, reduce the number of pressure strips 40 in the battery 100, reduce the number of parts in the battery 100, and facilitate assembly.

[0130] In some embodiments, the bead 40 contacts a first portion of the battery cell 20 , where the first portion includes a post of the battery cell 20 and / or a portion between the post and a side of the battery cell 20 .

[0131] The first part includes the pole of the battery cell 20 and / or the part between the pole and the side of the battery cell 20, including the following situations: first, the first part only includes the pole of the battery cell 20; second, the first part only includes the part between the pole and the side of the battery cell 20; third, the first part includes both the pole of the battery cell 20 and the part between the pole and the side of the battery cell 20.

[0132] The holding strip 40 contacts the first portion of the battery cell 20 , and may not affect the normal assembly and use of the battery cell 20 .

[0133] In some embodiments, the pressure strip 40 is a strip-shaped portion and is disposed along the first direction X.

[0134] The solution provided in this embodiment makes the structure of the pressure strip 40 simple and easy to assemble.

[0135] like Fig.10 As shown, in some embodiments, the battery 100 further includes a connector 50. The connector 50 connects the pressure strip 40 and the lower box 11.

[0136] The connecting member 50 may be a single body or a combination of multiple bodies, depending on the usage requirements.

[0137] The solution provided in this embodiment is adopted to facilitate the connection between the pressure strip 40 and the lower box body 11 .

[0138] In some embodiments, the connector 50 includes a rivet nut, and the pressure strip 40 and the lower box 11 are clamped by the rivet nut. In other embodiments, the connector 50 includes a rivet nut disposed on the lower box 11, and a bolt connecting the pressure strip 40 and the rivet nut.

[0139] Pull rivet nut is also called rivet nut, pull cap, instant pull cap. Pull rivet nut breaks through the traditional way of installing parts on thin plates. It does not need to tap the internal thread. It has the advantages of high riveting efficiency, easy use, no noise, etc. It is a direct substitute for welding nuts. It uses a pull rivet gun to rivet and is formed in one time. It is convenient, firm, beautiful and durable. Commonly used pull rivet nuts are: flat head vertical grain pull rivet nut GB17880.1, large countersunk head vertical grain pull rivet nut GB17880.2, small countersunk head vertical grain pull rivet nut GB17880.3, flat head semi-hexagonal pull rivet nut GB17880.5, small countersunk head hexagonal pull rivet nut, etc.

[0140] The connecting member 50 adopts the structure provided in this embodiment, has excellent connection performance and is easy to process.

[0141] Another embodiment of the present application further provides an electrical device, which includes the battery provided by any of the above embodiments.

[0142] As mentioned above, the electric device may be a vehicle, etc. Depending on the specific type of the electric device, other structures besides the battery may be included, such as a vehicle frame, etc.

[0143] The electrical device provided in the embodiments of the present application, including the battery provided in any of the above embodiments, can effectively improve the mechanical strength of the contact portion (i.e., the contact portion) between the pressure strip and the lower case, reduce the risk of damage to the connection between the pressure strip and the lower case under vibration conditions and battery expansion conditions, and at the same time can enhance the structural strength of the combined structure composed of the lower case and the pressure strip, and improve the stability of the battery structure.

[0144] like Figures 4 to 10As shown, an embodiment of the present application provides a battery 100. The battery 100 includes a lower box body 11, a battery module 30 and a pressure strip 40. Among them, the lower box body 11 has a accommodating space. The battery module 30 is arranged in the accommodating space. The pressure strip 40 is located on the side of the battery module 30 away from the bottom surface of the lower box body 11, and is used to apply pressure toward the bottom surface to the battery module 30. The pressure strip 40 has a contact portion 40a and a reinforcing portion 42. At least one of the contact portion 40a and the reinforcing portion 42 is connected to the lower box body 11. The contact portion 40a is in contact with the lower box body 11. The reinforcing portion 42 is connected to the contact portion 40a, and is used to strengthen the mechanical strength of the contact portion 40a.

[0145] The mechanical strength of the reinforcing portion 42 is greater than the mechanical strength of the contact portion 40 a .

[0146] In some embodiments, the reinforcing portion 42 is a plate-shaped structure. In other embodiments, the reinforcing portion 42 includes a first sub-portion 421 and a second sub-portion 422. The first sub-portion 421 is connected to the contact portion 40a. The second sub-portion 422 is located outside the contact portion 40a, and is vertically arranged and connected to the first sub-portion 421, and the second sub-portion 422 is also connected to the lower box body 11.

[0147] The reinforcement portion 42 is an integrally formed metal component.

[0148] The contact portion 40 a defines a groove 44 , and the reinforcement portion 42 is disposed in the groove 44 .

[0149] The groove 44 refers to a groove sunken on the surface of the contact portion 40a. The groove 44 can be made by an integrated molding process, or by cutting, molding, or other processes after the contact portion 40a is formed. The reinforcement portion 42 is disposed in the groove 44, and a portion of the reinforcement portion 42 can be located in the groove 44, or the entire reinforcement portion 42 can be located in the groove 44. For example, when the reinforcement portion 42 is a plate-shaped structure, the entire reinforcement portion 42 is located in the groove 44. When the reinforcement portion 42 is an L-shaped structure composed of a first sub-portion 421 and a second sub-portion 422, the first sub-portion 421 is located in the groove 44, and the second sub-portion 422 is located outside the groove 44.

[0150] The pressure strip 40 also includes a main body 41 and a connecting portion 43. The end of the main body 41 is a contact portion 40a. The connecting portion 43 is arranged between the contact portion 40a and the reinforcing portion 42, and is used to connect the contact portion 40a and the reinforcing portion 42, and is also used to transmit the force of the contact portion 40a to the reinforcing portion 42. The main body 41 is a solid structure or a hollow structure. When the main body 41 is a hollow structure, the main body 41 includes a first plate 411, a second plate 412 and a third plate 413. The first plate 411 is in contact with the battery module 30. The second plate 412 is arranged opposite to the first plate 411. The third plate 413 connects the second plate 412 and the first plate 411. Among them, the third plate 413 is provided with three, and the two third plates 413 located at the edge and the first plate 411 and the second plate 412 enclose a closed space, and the third plate 413 located in the middle divides the closed space into two sub-cavities.

[0151] The main body 41 is an integrally formed structure. The main body 41 is made of an insulating material. The insulating material includes at least one of a fiber-reinforced thermosetting composite material and a fiber-reinforced thermoplastic material. The connecting portion 43 includes an adhesive layer. The surface of the adhesive layer is a rough surface.

[0152] The battery module 30 includes a plurality of battery cells 20 arranged along a first direction. The same pressure strip 40 contacts two adjacent groups of battery cells 20. The first direction is generally the thickness direction of the battery cell 20. The pressure strip 40 contacts a first portion of the battery cell 20, and the first portion includes a pole of the battery cell 20 and / or a portion between the pole and the side of the battery cell 20. The pressure strip 40 is a strip-shaped portion and is arranged along the first direction.

[0153] The battery 100 further includes a connector 50. The connector 50 connects the pressure strip 40 and the lower box 11. In some embodiments, the connector 50 includes a rivet nut, and the pressure strip 40 and the lower box 11 are clamped by the rivet nut. In other embodiments, the connector 50 includes a rivet nut disposed on the lower box 11, and a bolt connecting the pressure strip 40 and the rivet nut.

[0154] The pressure strip 40 is fixed to the shoulder of the battery cell 20 (i.e., between the pole and the side of the battery cell 20), which can effectively improve the rigidity of the battery 100; the pressure strip 40 is made of fiber-reinforced thermosetting composite materials (such as fiber-reinforced epoxy resin or fiber-reinforced polyurethane, etc.) or fiber-reinforced thermoplastic materials (such as polyamide (Polyamide, PA), polyphenylene sulfide (Polyphenylenesulphide, PPS), etc.), and the material itself has good insulation properties, effectively ensuring electrical safety; the end is bonded to the contact part 40a by a reinforcing part 42 to improve the strength of the rear end of the opening, effectively ensuring the structural strength of the battery cell 20 during the expansion process; the reinforcing part 42 is made of aluminum sheet or steel sheet with a thickness of 1mm to 3mm.

[0155] The battery 100 can effectively improve the mechanical strength of the contact portion (i.e., the contact portion 40a) between the pressure strip 40 and the lower case 11, reduce the risk of damage to the connection between the pressure strip 40 and the lower case 11 under vibration conditions and battery expansion conditions, and at the same time enhance the structural strength of the combined structure composed of the lower case 11 and the pressure strip 40, thereby improving the stability of the battery 100 structure.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: include: The lower box body has a containing space; A battery module is arranged in the accommodation space; as well as A pressure strip is located on the side of the battery module away from the bottom surface of the lower box body, and is used to apply pressure to the battery module toward the bottom surface; the pressure strip has a contact portion and a reinforcement portion, at least one of the contact portion and the reinforcement portion is connected to the lower box body, the contact portion and the lower box body are in contact with each other, and the reinforcement portion is connected to the contact portion to strengthen the mechanical strength of the contact portion.

2. The battery according to claim 1, characterized in that The mechanical strength of the reinforcing portion is greater than the mechanical strength of the contact portion.

3. The battery according to claim 1, characterized in that The reinforcement part is a plate-shaped structure.

4. The battery according to claim 1, characterized in that The reinforcement part comprises: A first sub-portion connected to the contact portion; and The second sub-portion is located outside the contact portion and is arranged at an angle to and connected to the first sub-portion. The second sub-portion is also connected to the lower box body.

5. The battery according to claim 1, characterized in that The reinforcement portion is an integrally formed structure.

6. The battery according to claim 1, characterized in that The reinforcement portion is a metal portion.

7. The battery according to claim 1, characterized in that The contact portion is provided with a groove, and the reinforcement portion is arranged in the groove.

8. The battery according to claim 1, characterized in that The layering strip also includes: a main body, an end of which is the contact portion; and The connecting portion is arranged between the contact portion and the reinforcing portion, and is used to connect the contact portion and the reinforcing portion, and is also used to transmit the force of the contact portion to the reinforcing portion.

9. The battery according to claim 8, characterized in that The main body is a solid structure or a hollow structure.

10. The battery according to claim 8, characterized in that The main body comprises: A first plate body, the first plate body is in contact with the battery module; A second plate body, arranged opposite to the first plate body; and The third plate body connects the second plate body and the first plate body.

11. The battery according to claim 10, characterized in that There are three third plates, two of which are located at the edges, and the first plate and the second plate form a closed space, and the third plate in the middle divides the closed space into two sub-cavities.

12. The battery according to any one of claims 8 to 11, characterized in that: The main body is an integrally formed structure.

13. The battery according to any one of claims 8 to 11, characterized in that: The main body is made of insulating material.

14. The battery according to claim 13, characterized in that The insulating material includes at least one of a fiber-reinforced thermosetting composite material and a fiber-reinforced thermoplastic material.

15. The battery according to any one of claims 8 to 11, characterized in that: The connecting portion includes an adhesive layer.

16. The battery according to claim 15, characterized in that The surface of the bonding layer is a rough surface.

17. The battery according to any one of claims 1 to 11, characterized in that: The battery module includes a plurality of battery cells arranged along a first direction; The same pressure strip contacts both of the two adjacent groups of battery cells.

18. The battery according to claim 17, characterized in that The pressure strip contacts a first portion of the battery cell, where the first portion includes a pole of the battery cell and / or a portion between the pole and a side surface of the battery cell.

19. The battery according to claim 17, characterized in that The pressure strip is a strip-shaped portion and is arranged along the first direction.

20. The battery according to any one of claims 1 to 11, characterized in that: The battery also includes: A connecting piece connects the pressure strip and the lower box body.

21. The battery according to claim 20, characterized in that The connecting piece includes a rivet nut, and the pressure strip and the lower box body are clamped by the rivet nut; Alternatively, the connecting member includes a rivet nut arranged on the lower box body, and a bolt connecting the pressure strip and the rivet nut.

22. An electrical device, characterized in that: A battery comprising any one of claims 1 to 21.

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