Battery and electric device

Abstract

The utility model provides a battery and a power utilization device, and belongs to the technical field of batteries. The battery comprises a battery monomer and a battery box, the battery box comprises a first box body and a second box body, and the first box body comprises a first side wall and a first bottom wall; the second box body comprises a second side wall and a second bottom wall which define a containing cavity, an opening of the containing cavity faces the first bottom wall, the battery monomers are located in the containing cavity, the first box body covers the opening of the containing cavity, the second bottom wall is opposite to the first bottom wall, the first side wall is located on the outer side of the circumferential direction of the second side wall, and the first side wall and the second side wall are connected in a sealed mode. The first box body and the second box body are connected through the side walls, so that the internal space of the battery box can be increased under the condition that the occupied space of the battery box is not changed, and the battery power is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the related art, the battery includes a battery cell and a battery box for accommodating the battery cell. In order to improve the sealing performance of the battery box, it is necessary to add a seal with a certain width requirement on the flange surface between the first box body and the second box body. The setting of the seal may increase the width of the first box body flange and the second box body flange, resulting in the first box body flange and the second box body flange occupying a certain space, thereby reducing the space utilization of the battery. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one purpose of the present application is to provide a battery and an electrical device to increase the internal space of the battery and improve the energy density of the battery.

[0005] An embodiment of the first aspect of the present application provides a battery, which includes a battery cell and a battery box, wherein the battery box includes a first box body and a second box body, wherein the first box body includes a first side wall and a first bottom wall; the second box body includes a second side wall and a second bottom wall surrounding a accommodating cavity, the opening of the accommodating cavity faces the first bottom wall, the battery cell is located in the accommodating cavity, the first box body covers the opening of the accommodating cavity, the second bottom wall is opposite to the first bottom wall, the first side wall is located on the outer side of the second side wall in a circumferential direction, and the first side wall is sealed and connected to the second side wall.

[0006] In the technical solution of the embodiment of the present application, by adopting the connection method of the first side wall of the first box body and the second side wall of the second box body, instead of the connection method of the first box flange and the second box flange, the space occupied by the first box flange and the second box flange can be effectively saved. When the space occupied by the original battery box remains unchanged, the side walls of the battery box can be widened to the edges of the original first box flange and the second box flange, thereby increasing the internal space of the battery box, so that the battery box can accommodate more battery cells, thereby improving the energy density of the battery.

[0007] In some embodiments, the battery box further comprises a seal, wherein a first portion of the seal is located between the first side wall and the second side wall. By adding a seal between the first side wall and the second side wall, the sealing performance between the first box body and the second box body of the battery box is improved.

[0008] In some embodiments, the seal also includes a second part, the first part is connected to the second part, and the second part is located between the second side wall and the first bottom wall. By dividing the seal into two parts, the first part is between the second side wall and the first side wall, and the second part is between the second side wall and the first bottom wall, the seal can not only play a sealing role, but also facilitate the installation and fixation of the seal to prevent the seal from falling, and can also reduce the use of adhesive between the seal and the battery box, thereby improving assembly efficiency.

[0009] In some embodiments, along the first direction, the length of the first portion is greater than or equal to 8 mm and less than or equal to 50 mm, and the first direction is the extension direction of the first side wall toward the second bottom wall. Considering the sealing effect between the first box and the second box, by setting the size of the first portion between the first side wall and the second side wall to be greater than or equal to 8 mm, a wider seal is provided between the first box and the second box to ensure the sealing performance, and at the same time, the size of the first portion between the first side wall and the second side wall is set to be less than or equal to 50 mm, so that the space occupied by the seal does not become too large, thereby affecting the connection between the first box and the second box.

[0010] In some embodiments, the sealing member surrounds the opening of the accommodating cavity. By fixing the sealing member at the opening of the accommodating cavity in a surrounding manner, the first side wall and the second side wall are continuously sealed, thereby improving the sealing performance.

[0011] In some embodiments, the second side wall has a connecting portion, and the battery box further includes: a connecting piece that passes through the first side wall and is connected to the connecting piece. By providing the connecting piece on the second side wall, it is convenient to connect the first side wall with the second side wall, and at the same time, the connecting piece is used to pass through the first side wall and connect with the connecting piece, so as to realize a detachable connection mode, facilitate the installation of the first box body and the second box body, and also facilitate the disassembly between the first box body and the second box body, thereby improving assembly efficiency and assembly flexibility.

[0012] In some embodiments, the connection portion includes a first connection protrusion protruding toward the accommodating cavity. The fixed connection is performed through the connection piece. Considering the connection contact length of the connection piece, in order to improve the stability of the connection, the connection portion is provided with a first connection protrusion protruding toward the accommodating cavity. The setting of the first connection protrusion increases the connection length of the connection piece deep into the connection portion, thereby increasing the contact area of ​​the connection piece and improving the stability of the connection.

[0013] In some embodiments, the first connection protrusion protrudes from the second side wall by a size greater than or equal to 1 mm and less than or equal to 4 mm. Considering that the first connection protrusion will occupy the space inside the battery box, if the first connection protrusion is too large, it will affect the arrangement of the battery cells inside the battery box, and if the first connection protrusion is too small, it may affect the connection strength between the connector and the connecting part. Taking all factors into consideration, the first connection protrusion protrudes from the second side wall by a size between 1 mm and 4 mm, which can both stabilize the connection and reduce the impact on the arrangement of the battery cells.

[0014] In some embodiments, the first connection protrusions are arranged around the second side wall at intervals. The first box body and the second box body are connected by arranging the first connection protrusions around the intervals, thereby improving the connection stability and minimizing the space occupied by the first connection protrusions inside the box body to reduce the impact on the arrangement of the battery cells.

[0015] In some embodiments, the first connection protrusion is connected to the second bottom wall. Considering the problem that the first connection protrusion occupies space inside the battery box, by connecting the first connection protrusion to the second bottom wall, the connection position is close to the bottom of the second box body, and by utilizing part of the second bottom wall position, the interference with the arrangement of the battery cells is reduced as much as possible, and the space above it can also be used for the arrangement of wiring, etc.

[0016] In some embodiments, the connecting portion further includes a second connecting protrusion protruding toward the first side wall. By providing the second connecting protrusion protruding toward the first side wall on the connecting portion, the first side wall and the second side wall can be easily aligned, and installation is convenient. At the same time, considering that there is a seal between the first side wall and the second side wall, the size of the second connecting protrusion is equal to the size of the first part of the seal after compression. The second connecting protrusion can limit the compression degree of the seal, and avoid as much as possible the reduction of the sealing performance caused by excessive or insufficient compression of the seal.

[0017] In some embodiments, the size of the second connection protrusion protruding from the second side wall is less than or equal to 3 mm and greater than or equal to 1 mm. Considering that the size of the second connection protrusion is equal to the size of the first part of the seal after compression, the size of the second connection protrusion protruding from the second side wall is less than or equal to 3 mm, so that the thickness of the seal between the compressed first side wall and the second side wall is less than or equal to 3 mm, thereby improving the sealing performance of the seal. At the same time, the size of the second connection protrusion protruding from the second side wall is greater than or equal to 1 mm, thereby minimizing damage to the first part of the seal caused by excessive compression.

[0018] In some embodiments, the second connection protrusions are arranged around the second side wall at intervals. The second connection protrusions are arranged around the intervals so that the first box body and the second box body are connected, and the connection stability is improved. At the same time, the second connection protrusions correspond to the first connection protrusions and can be formed together, which is convenient for mass production of the second box body.

[0019] In some embodiments, the connecting portion has a connecting hole, an insert nut is provided in the connecting hole, and the connecting piece is connected to the insert nut. By installing the insert nut in the connecting hole, the connecting piece and the insert nut are connected to improve the connection and fixing strength between the connecting piece and the insert nut, so as to meet the connection requirement of the connecting portion with different materials and the first side wall.

[0020] An embodiment of the second aspect of the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0021] 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

[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0023] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0024] Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0025] Figure 3 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0026] Figure 4 This is a schematic diagram of the exploded structure of a battery box according to some embodiments of the present application;

[0027] Figure 5 This is a schematic diagram of the structure of the sealing member in some embodiments of the present application;

[0028] Figure 6 A top view of a battery box according to some embodiments of the present application;

[0029] Figure 7 for Figure 6 Cross-sectional view of the AA section;

[0030] Figure 8 This is a schematic structural diagram of a second box body of a battery box in some embodiments of the present application;

[0031] Fig. 9 for Figure 8 A partial enlarged schematic diagram of part B.

[0032] Description of reference numerals:

[0033] 1. Vehicle; 10. Battery; 20. Controller; 30. Motor; 100. Battery box; 110. First box body; 112. First side wall; 113. First bottom wall; 120. Second box body; 121. Accommodating cavity; 122. Second side wall; 1221. Connecting part; 1222. First connecting protrusion; 1223. Second connecting protrusion; 1224. Connecting hole; 1225. Insert nut; 123. Second bottom wall; 130. Seal; 131. First part; 132. Second part; 140. Connector; 200. Battery cell; 210. End cover; 211. Electrode terminal; 220. Shell; 230. Cell assembly; 231. Tab. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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).

[0040] 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.

[0041] 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.

[0042] 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.

[0043] The battery includes a battery box and battery cells installed in the battery box. The battery box includes a first box body and a second box body. The connection between the first box body and the second box body of the battery box is an important link in the battery design, which involves the sealing, safety and stability of the overall structure of the battery. The battery cells in the battery box contain electrolytes, which play an important role in the battery charging and discharging process. The good sealing of the battery box can prevent electrolyte leakage, avoid damage to the environment and human body, and ensure the long-term stable operation of the battery. At the same time, the battery box can prevent external moisture, dust, chemicals, etc. from eroding and damaging the internal components of the battery box, thereby improving the service life and stability of the battery. It can also reduce the possibility of accidental damage and accidents during transportation, installation and use of the battery, thereby improving battery safety.

[0044] At present, in order to have good sealing performance, the battery box is sealed with a seal. The larger the sealing width of the seal, the better the corresponding sealing effect. In order to improve the sealing performance, the first box body and the second box body of the battery box usually adopt a bent flange plus a seal design, and a larger sealing surface is set on the first box body and the second box body. It can be simply understood that the first box body and the second box body have a wider flange end face, and the seal is located between the flange end faces of the first box body and the second box body. In the vertical direction, the bolt hole of the seal is pressed on the rivet nut of the flange of the second box body, and the flanges of the first box body and the second box body are fully compacted and coupled with the seal by tightening the bolts.

[0045] Since the flange connection ends of the first box body and the second box body protrude from the side walls of the battery box, the length and width dimensions of the entire battery box are increased. Therefore, within the limited length and width installation space, the dimensions inside the battery box can only be reduced accordingly to meet the requirements of the entire battery box assembly. The reduction in the internal dimensions of the battery box reduces the number of battery cells installed in the battery box, thereby reducing the energy density of the battery.

[0046] In order to solve this technical problem, by connecting the first side wall of the first box body and the second side wall of the second box body, instead of connecting the first box flange and the second box flange, the space occupied by the first box flange and the second box flange can be effectively saved. When the original space occupied by the battery box remains unchanged, the side walls of the battery box can be widened to the edges of the original first box flange and the second box flange, thereby increasing the distance between the relative side walls of the battery box, thereby increasing the internal space of the battery box, so that the battery box can accommodate more battery cells and improve the battery power.

[0047] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system having the battery disclosed in the present application to form the electrical device can be used, which is beneficial to increase the internal space of the battery box and improve the battery performance.

[0048] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may 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, 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, and a spacecraft, etc.

[0049] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device in an embodiment of the present application.

[0050] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1 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 10 is provided inside the vehicle 1, and the battery 10 may be provided at the bottom, head or tail of the vehicle 1. The battery 10 may be used to power the vehicle 1, for example, the battery 10 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 20 and a motor 30, and the controller 20 is used to control the battery 10 to power the motor 30, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0051] In some embodiments of the present application, the battery 10 can be used not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0052] Please refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of the battery provided for some embodiments of the present application. The battery 10 includes a battery box 100 and a battery cell 200, and the battery cell 200 is contained in the battery box 100. Among them, the battery box 100 is used to provide a storage space for the battery cell 200, and the battery box 100 can adopt a variety of structures. In some embodiments, the battery box 100 may include a first box body 110 and a second box body 120, and the first box body 110 and the second box body 120 cover each other, and the first box body 110 and the second box body 120 jointly define a storage space for accommodating the battery cell 200. The first box body 110 and the second box body 120 can be hollow structures with one side open, and the first box body 110 covers the open side of the second box body 120, so that the first box body 110 and the second box body 120 jointly define a storage space. Of course, the battery box 100 formed by the first box body 110 and the second box body 120 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0053] In the battery 10, there may be multiple battery cells 200, and the multiple battery cells 200 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 200 are both connected in series and in parallel. The multiple battery cells 200 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 200 is accommodated in the battery box 100; of course, the battery 10 may also be a battery module formed by connecting multiple battery cells 200 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 battery box 100. The battery 10 may also include other structures, for example, the battery 10 may also include a busbar component for realizing electrical connection between the multiple battery cells 200.

[0054] Each battery cell 200 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 200 may be cylindrical, flat, rectangular, or in other shapes.

[0055] Please refer to Figure 3 , Figure 3 The schematic diagram of the decomposition structure of a battery cell provided in some embodiments of the present application. A battery cell 200 refers to the smallest unit that constitutes a battery. Figure 3 The battery cell 200 includes an end cover 210, a shell 220, a battery cell assembly 230 and other functional components.

[0056] The end cap 210 refers to a component that covers the opening of the shell 220 to isolate the internal environment of the battery cell 200 from the external environment. Without limitation, the shape of the end cap 210 can be adapted to the shape of the shell 220 to match the shell 220. Optionally, the end cap 210 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 210 is not easily deformed when it is squeezed and collided, so that the battery cell 200 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 211 can be provided on the end cap 210. The electrode terminal 211 can be used to electrically connect with the battery cell assembly 230 to output or input the electrical energy of the battery cell 200. In some embodiments, the end cap 210 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 200 reaches a threshold. The material of the end cap 210 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member may be provided inside the end cap 210 to isolate the electrical connection components in the housing 220 from the end cap 210 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0057] The shell 220 is a component used to cooperate with the end cap 210 to form the internal environment of the battery cell 200, wherein the formed internal environment can be used to accommodate the battery cell assembly 230, the electrolyte and other components. The shell 220 and the end cap 210 can be independent components, and an opening can be set on the shell 220, and the internal environment of the battery cell 200 is formed by covering the opening with the end cap 210 at the opening. Without limitation, the end cap 210 and the shell 220 can also be integrated. Specifically, the end cap 210 and the shell 220 can form a common connection surface before other components are put into the shell, and when the interior of the shell 220 needs to be encapsulated, the end cap 210 covers the shell 220. The shell 220 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 220 can be determined according to the specific shape and size of the battery cell assembly 230. The material of the shell 220 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0058] The battery cell assembly 230 is a component in the battery cell 200 where electrochemical reactions occur. One or more battery cell assemblies 230 may be included in the housing 220. The battery cell assembly 230 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 battery cell assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 231. The positive tab and the negative tab 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 tab 231 connects the electrode terminals to form a current loop.

[0059] The embodiment of the present application provides a battery, the battery 10 includes a battery box 100 and a battery cell 200, please refer to Figure 4 , Figure 4 The schematic diagram of the exploded structure of the battery box of some embodiments of the present application, the battery box 100 includes a first box body 110 and a second box body 120, the first box body 110 includes a first side wall 112 and a first bottom wall 113; the second box body 120 includes a second side wall 122 and a second bottom wall 123 surrounding a receiving cavity 121, and the opening of the receiving cavity faces the first bottom wall 113; Figure 2 and Figure 4 The battery cell 200 is located in the accommodating cavity 121, the first box body 110 covers the opening of the accommodating cavity 121, the second bottom wall 123 is opposite to the first bottom wall 113, the first side wall 112 is located on the outer side of the second side wall 122 in the circumferential direction, and the first side wall 112 is sealed and connected to the second side wall 122.

[0060] The battery box 100 includes a first box body 110 and a second box body 120. The first box body 110 and the second box body 120 surround a cavity for accommodating a battery cell 200. For the sake of convenience, the battery box 100 is usually divided into an upper box body and a lower box body when placed on a horizontal plane. The first box body 110 can be used as an upper box body or a lower box body. For example, if the first box body 110 is an upper box body, the second box body 120 is a lower box body, and the side wall of the lower box body is circumferentially wrapped by the side wall of the upper box body; for example, if the first box body 110 is a lower box body, the second box body 120 is an upper box body, and the side wall of the upper box body is circumferentially wrapped by the side wall of the lower box body. The first box body 110 being an upper box body or a lower box body does not affect the connection form of the side wall. For the sake of convenience, the following description is taken as an example of the first box body 110 being an upper box body and the second box body 120 being a lower box body.

[0061] The first box body 110 has a first side wall 112 and a first bottom wall 113, and the first side wall 112 is connected to the edge of the first bottom wall 113. It should be noted that the structure of the first box body 110 is not limited. For example, if the first bottom wall 113 is a circular bottom wall, the first side wall 112 is a circular side wall connected to the first bottom wall 113; for example, if the first bottom wall 113 is a square side wall, the first side wall 112 is a plurality of square side walls respectively connected to the corresponding side edges of the first bottom wall 113.

[0062] The second box body 120 has a second side wall 122 and a second bottom wall 123. The edges of the second side wall 122 and the second bottom wall 123 are connected. The second side wall 122 and the second bottom wall 123 together surround a receiving cavity 121 with an opening. The receiving cavity 121 is used to receive the battery cell 200. The second side wall 122 of the second box body 120 should correspond to the first side wall 112 of the first box body 110, and the second bottom wall 123 of the second box body 120 should correspond to the first bottom wall 113 of the first box body 110, that is, if the first bottom wall 113 is circular, the second bottom wall 123 should also be circular; if the first bottom wall 113 is square, the second bottom wall 123 should also be square.

[0063] The first box body 110 covers the opening of the accommodating cavity 121, the second bottom wall 123 is opposite to the first bottom wall 113, and the first side wall 112 is located on the circumferential outer side of the second side wall 122. It can be understood that the first side wall 112 and the first bottom wall 113 of the first box body 110 form a U-shaped structure with the opening facing downward, and the second side wall 122 and the second bottom wall 123 of the second box body 120 form a U-shaped structure with the opening facing upward, and the first box body 110 is buckled on the second box body 120. The size of the first bottom wall 113 of the first box body 110 should be slightly larger than the size of the second bottom wall 123 of the second box body 120, so that the first side wall 112 of the first box body 110 wraps the second side wall 122 of the second box body 120.

[0064] The first side wall 112 is sealed and connected to the second side wall 122. The specific connection method is not limited here and can be determined according to actual conditions. Exemplarily, the first side wall 112 and the second side wall 122 are both made of metal, and the first side wall 112 and the second side wall 122 can be connected by welding. Exemplarily, the first side wall 112 and the second side wall 122 are both made of plastic material, and the first side wall 112 and the second side wall 122 can be provided with connecting holes, and the first side wall 112 and the second side wall 122 are connected by bolts. Similarly, the specific connection position is not limited. For example, the edge of the first side wall 112 is connected to the second side wall 122; for example, the middle position of the first side wall 112 is connected to the second side wall 122.

[0065] In the technical solution of the embodiment of the present application, by adopting the connection method of the first side wall 112 of the first box body 110 and the second side wall 122 of the second box body 120, instead of the connection method of the first box flange and the second box flange, the space occupied by the first box flange and the second box flange can be effectively saved. When the space occupied by the original battery box 100 remains unchanged, the side wall of the battery box 100 can be widened to the edge of the original first box flange and the second box flange, thereby increasing the internal space of the battery box 100, so that the battery box 100 can accommodate more battery cells 200, thereby improving the energy density of the battery.

[0066] According to some embodiments of this application, please refer to Figure 4 and Figure 5 , Figure 5 This is a schematic diagram of the structure of a seal in some embodiments of the present application. The battery box 100 further includes a seal 130 . A first portion 131 of the seal 130 is located between the first side wall 112 and the second side wall 122 .

[0067] The first box body 110 covers the opening of the accommodating cavity 121, and the first side wall 112 of the first box body 110 wraps the second side wall 122 of the second box body 120. There may be a gap between the first side wall 112 of the first box body 110 and the second side wall 122 of the second box body 120, thereby affecting the sealing performance between the first box body 110 and the second box body 120. A sealing member 130 is added between the first side wall 112 and the second side wall 122, and the gap between the first side wall 112 and the second side wall 122 is filled by the sealing member 130, thereby meeting the sealing requirements of the battery box 100.

[0068] The type of the seal 130 is not limited, and the corresponding type of seal 130 can be selected according to the material of the first side wall 112 and the second side wall 122. The types of the seal 130 include rubber gaskets, aramid gaskets, asbestos gaskets, etc. Similarly, the shape of the seal 130 is not limited, and the shape of the seal 130 should correspond to the structure of the second side wall 122. For example, if the second side wall 122 is a square side wall, the seal 130 is a square annular seal; for example, if the second side wall 122 is a circular side wall, the seal 130 is a circular annular seal.

[0069] By adding a seal 130 between the first side wall 112 and the second side wall 122 , the sealing performance between the first box body 110 and the second box body 120 of the battery box 100 is improved.

[0070] According to some embodiments of this application, please refer to Figure 4 and Figure 5 The sealing member 130 further includes a second portion 132 , the first portion 131 is connected to the second portion 132 , and the second portion 132 is located between the second side wall 122 and the first bottom wall 113 .

[0071] The seal 130 includes a first portion 131 and a second portion 132. The extension direction of the first portion 131 and the extension direction of the second portion 132 form an angle. The first portion 131 is between the second side wall 122 and the first side wall 112, and the second portion 132 is between the second side wall 122 and the first bottom wall 113. It can be simply understood that the cross section of the seal 130 is an L-shaped structure, and the second portion 132 of the seal 130 overlaps the end surface of the second side wall 122. During the assembly process, overlapping the second portion 132 of the seal 130 on the end surface of the second side wall 122 can reduce the possibility of the seal 130 falling off. Then, the first box body 110 is buckled on the second box body 120, and the first portion 131 of the seal 130 seals the gap between the second side wall 122 and the first side wall 112; the second portion 132 of the seal 130 can seal the gap between the second side wall 122 and the first bottom wall 113, thereby enhancing the sealing performance of the battery box 100.

[0072] In order to improve the stability of the connection between the sealing member 130 and the second side wall 122 and the first side wall 112 , the sealing member 130 and the second side wall 122 may be bonded together by adding an adhesive.

[0073] In other implementations of the present application, the second portion 132 of the seal 130 may overlap the end surface of the second side wall 122 without sealing the gap between the second side wall 122 and the first bottom wall 113 .

[0074] By dividing the seal 130 into two parts, with the first part 131 between the second side wall 122 and the first side wall 112, and the second part 132 between the second side wall 122 and the first bottom wall 113, the seal 130 can not only play a sealing role, but also facilitate the installation and fixation of the seal 130 to prevent the seal 130 from falling, and can also reduce the use of adhesive between the seal 130 and the battery box 100, thereby improving assembly efficiency.

[0075] According to some embodiments of this application, please refer to Figure 6 and Figure 7 , Figure 6 This is a top view of a battery box according to some embodiments of the present application. Figure 7 for Figure 6 In the cross-sectional view of the AA portion, along the first direction, the length of the first portion 131 is greater than or equal to 8 mm and less than or equal to 50 mm. The first direction is the extension direction of the first side wall 112 toward the second bottom wall 123 .

[0076] The first portion 131 is sealed between the first side wall 112 and the second side wall 122. Along the first direction, the length of the first portion 131 is d1. d1 can be understood as the shortest path size that the gas in the battery box 100 passes through the first portion 131 and overflows the battery box 100. The moving direction of the shortest path of the gas is the extension direction of the first side wall 112 to the second bottom wall 123. Figure 7 In the direction indicated by the arrow. In order to improve the sealing performance, the length d1 of the first part 131 is greater than or equal to 8 mm, which can be understood as the path length of the gas in the battery box 100 passing through the first part 131 of the seal 130 is greater than or equal to 8 mm. At the same time, in order to prevent the first part 131 of the seal 130 from occupying too much space, the length d1 of the first part 131 is less than or equal to 50 mm.

[0077] It should be noted that the gas movement path is only for the convenience of directional description and does not mean that the gas can leak through the seal 130 .

[0078] Taking the sealing effect between the first box body 110 and the second box body 120 into comprehensive consideration, by setting the size of the first part 131 between the first side wall 112 and the second side wall 122 to be greater than or equal to 8 mm, a wider seal 130 is provided between the first box body 110 and the second box body 120 to ensure the sealing performance. At the same time, the size of the first part 131 between the first side wall 112 and the second side wall 122 is set to be less than or equal to 50 mm, so that the space occupied by the seal 130 is not too large, which affects the connection between the first box body 110 and the second box body 120.

[0079] According to some embodiments of this application, please refer to Figure 4 and Figure 5 The sealing member 130 surrounds the opening of the accommodating chamber 121 .

[0080] The second side wall 122 and the second bottom wall 123 of the second box body 120 together surround a receiving cavity 121 having an opening, and the seal 130 surrounds the opening of the receiving cavity 121. For example, the opening of the receiving cavity 121 is a circular opening, and the seal 130 is a circular annular seal; for example, the opening of the receiving cavity 121 is a square opening, and the seal 130 is a square annular seal.

[0081] By fixing the sealing member 130 in a surrounding manner at the opening position of the accommodating cavity 121 , continuous sealing is achieved between the first side wall 112 and the second side wall 122 , thereby improving the sealing performance.

[0082] According to some embodiments of this application, please refer to Figure 4 and Figure 7 The second side wall 122 has a connecting portion 1221 , and the battery box 100 further includes a connecting member 140 , which passes through the first side wall 112 and is connected to the connecting portion 1221 .

[0083] The second side wall 122 has a connecting portion 1221, which can be understood as a structure for assisting the connection with the first side wall 112. The specific structural form of the connecting portion 1221 can be adjusted according to different connection methods. For example, the first side wall 112 and the second side wall 122 are connected by a connecting member 140. When the connecting member 140 is a bolt, the connecting portion 1221 can be provided with a bolt hole accordingly, and the first side wall 112 is also provided with a through hole accordingly. The bolt passes through the through hole of the first side wall 112 and is connected with the bolt hole. The connecting portion 1221 can be continuous, that is, a plurality of bolt holes can be arranged at intervals on the connecting portion 1221 for connection; the connecting portion 1221 can also be discontinuous, that is, the number of connecting portions 1221 is multiple, and each connecting portion 1221 is provided with a bolt hole separately for connection.

[0084] By providing a connecting portion 1221 on the second side wall 122, the first side wall 112 is conveniently connected to the second side wall 122. At the same time, a connecting member 140 is adopted to pass through the first side wall 112 and connect to the connecting portion 1221, thereby realizing a detachable connection method, facilitating the installation of the first box body 110 and the second box body 120, and also facilitating the disassembly between the first box body 110 and the second box body 120, thereby improving assembly efficiency and assembly flexibility.

[0085] According to some embodiments of this application, please refer to Figure 4 and Figure 7 The connecting portion 1221 includes a first connecting protrusion 1222 protruding toward the accommodating cavity 121 .

[0086] The second side wall 122 and the second bottom wall 123 of the second box body 120 are surrounded together to form a receiving cavity 121 with an opening. The connecting portion 1221 is arranged on the second side wall 122. The connection between the first side wall 112 and the second side wall 122 mainly relies on the connection and fixing force between the connecting member 140 and the connecting portion 1221. When the connecting member 140 is used as a bolt, the connection hole of the connecting portion 1221 is related to the bolt bite length and the bolt diameter. In order to improve the connection stability, the bite length dimension of the connecting hole and the bolt should be greater than or equal to 0.8 times the bolt diameter dimension. The thickness of the second side wall 122 may not meet the bite size requirements. By setting the first connecting protrusion 1222 so that the connecting portion 140 and the connecting portion 1221 protrude toward the receiving cavity 121, the connection size requirements of the connecting member 140 and the connecting portion 1221 can be met.

[0087] A fixed connection is performed through the connecting piece 140. Considering the contact length of the connecting piece 140, in order to improve the stability of the connection, the connecting portion 1221 is provided with a first connecting protrusion 1222 protruding toward the accommodating cavity 121. The setting of the first connecting protrusion 1222 increases the connection length of the connecting piece 140 penetrating into the connecting portion 1221, thereby increasing the contact area of ​​the connecting piece 140 and improving the stability of the connection.

[0088] According to some embodiments of this application, please refer to Figure 7 The dimension of the first connection protrusion 1222 protruding from the second side wall 122 is greater than or equal to 1 mm and less than or equal to 4 mm.

[0089] The size of the connection hole in the connection portion 1221 only needs to meet the connection requirements of the connection member 140, that is, the engagement length between the connection hole and the bolt is greater than or equal to 0.8 times the bolt diameter. Therefore, the size of the connection hole and the bolt can be appropriately adjusted accordingly, and the size d2 of the first connection protrusion 1222 protruding from the second side wall 122 is greater than or equal to 1 mm and less than or equal to 4 mm, that is, the size d2 is between 1 mm and 4 mm.

[0090] Taking into account that the first connecting protrusion 1222 will occupy the space inside the battery box 100, if the size of the first connecting protrusion 1222 is too large, it will affect the arrangement of the battery cells 200 inside the battery box 100, and if the size of the first connecting protrusion 1222 is too small, it may affect the connection strength between the connecting piece and the connecting part 1221. Taking all factors into consideration, the size of the first connecting protrusion 1222 protruding from the second side wall 122 is between 1mm and 4mm, which can not only ensure a stable connection, but also reduce the impact on the arrangement of the battery cells 200.

[0091] According to some embodiments of this application, please refer to Figure 8 and Fig. 9 , Figure 8 This is a schematic diagram of the structure of the second box of the battery box in some embodiments of the present application. Fig. 9 for Figure 8 The first connection protrusions 1222 are arranged around the second side wall 122 at intervals.

[0092] The first connecting protrusions 1222 are arranged around the second side wall 122, and the plane formed by the line connecting the geometric center points of the plurality of first connecting protrusions 1222 is parallel to the plane of the second bottom wall 123. Surrounding includes evenly spaced arrangement, and can also be unevenly spaced arrangement, which can be determined according to actual needs. For example, the second side wall 122 surrounds to form an annular side wall, and the first connecting protrusions 1222 can be evenly arranged on the annular side wall, and the distance between two adjacent first connecting protrusions 1222 can be 80mm. For example, the second side wall 122 is a square side wall, and the first connecting protrusions 1222 can be unevenly arranged on the square side wall, and the density of the first connecting protrusions 1222 near the square corners is greater than the density of the first connecting protrusions 1222 away from the square corners.

[0093] The first connection protrusions 1222 are arranged in a surrounding and spaced manner to connect the first box body 110 and the second box body 120, thereby improving the connection stability and minimizing the space occupied by the first connection protrusions 1222 inside the box body to reduce the impact on the layout of the battery cells 200.

[0094] According to some embodiments of this application, please refer to Figure 7 , the first connecting protrusion 1222 is connected to the second bottom wall 123 .

[0095] The first connecting protrusion 1222 is connected to the second bottom wall 123 . It can be understood that the first connecting protrusion 1222 is located near the end of the second side wall 122 and may utilize part of the space of the second bottom wall 123 .

[0096] Taking into account the problem that the first connecting protrusion 1222 occupies space inside the battery box 100, the first connecting protrusion 1222 is connected to the second bottom wall 123 so that the connection position is close to the bottom of the second box body 120. By utilizing part of the position of the second bottom wall 123, the interference with the arrangement of the battery cells 200 is minimized as much as possible, and the space above can also be used for wiring arrangements, etc.

[0097] According to some embodiments of this application, please refer to Figure 7 The connecting portion 1221 also includes a second connecting protrusion 1223 protruding toward the first side wall 112 .

[0098] The connecting portion 1221 is arranged on the second side wall 122. The connection between the first side wall 112 and the second side wall 122 mainly relies on the connecting and fixing force between the connecting member 140 and the connecting portion 1221. When the connecting member 140 is used as a bolt, the connecting hole of the connecting portion 1221 is related to the bolt engagement length and the bolt diameter. In order to improve the connection stability, the engagement length dimension of the connecting hole and the bolt should be greater than or equal to 0.8 times the bolt diameter dimension.

[0099] The thickness of the second side wall 122 may not meet the bite size requirements. By protruding the connecting portion 1221 toward the accommodating cavity 121 to set the first connecting protrusion 1222, the connecting portion 1221 may also be protruded toward the first side wall 112 to set the second connecting protrusion 1223. The second connecting protrusion 1223 can reduce the size of the first connecting protrusion 1222 accordingly, and correspondingly reduce the space occupied by the first connecting protrusion 1222 inside the battery box 100. The second connecting protrusion 1223, the wall thickness of the second side wall 122, and the first connecting protrusion 1222 together form a connected connecting hole to meet the connection size requirements of the connecting member 140 and the connecting portion 1221.

[0100] At the same time, the protruding size of the second connecting protrusion 1223 defines the spacing distance between the second side wall 122 and the first side wall 112, and the spacing distance is the thickness dimension of the first portion 131 of the sealing member 130 after compression.

[0101] By providing a second connecting protrusion 1223 on the connecting portion 1221 that protrudes toward the first side wall 112, the first side wall 112 can be easily aligned with the second side wall 122, thereby facilitating installation. Meanwhile, considering that a seal 130 is provided between the first side wall 112 and the second side wall 122, the size of the second connecting protrusion 1223 is equivalent to the size of the first portion 131 of the seal 130 after compression. The second connecting protrusion 1223 can limit the degree of compression of the seal 130, thereby avoiding as much as possible a decrease in the sealing performance of the seal 130 due to excessive or insufficient compression.

[0102] According to some embodiments of this application, please refer to Figure 7 The dimension of the second connection protrusion 1223 protruding from the second side wall 122 is less than or equal to 3 mm and greater than or equal to 1 mm.

[0103] The size of the connecting hole in the connecting portion 1221 should meet the connection requirements of the connecting member 140, and the spacing between the first side wall 112 and the second side wall 122 should meet the sealing requirements of the sealing member 130. The dimension d3 of the second connecting protrusion 1223 protruding from the second side wall 122 is less than or equal to 3 mm and greater than or equal to 1 mm.

[0104] Considering that the size of the second connecting protrusion 1223 is equal to the size of the first part 131 of the seal 130 after compression, the size of the second connecting protrusion 1223 protruding from the second side wall 122 is less than or equal to 3 mm, so that the thickness of the seal 130 between the first side wall 112 and the second side wall 122 after compression is less than or equal to 3 mm, thereby improving the sealing performance of the seal 130. At the same time, the size of the second connecting protrusion 1223 protruding from the second side wall 122 is greater than or equal to 1 mm, thereby minimizing the damage to the first part 131 of the seal 130 caused by excessive compression.

[0105] According to some embodiments of this application, please refer to Figure 8 and Fig. 9 The second connecting protrusions 1223 are arranged at intervals around the second side wall 122 .

[0106] The second connecting protrusions 1223 are arranged around the second side wall 122, and the plane formed by the line connecting the geometric center points of the plurality of second connecting protrusions 1223 is parallel to the plane of the second bottom wall 123. Surrounding includes evenly spaced arrangement, and can also be unevenly spaced arrangement, which can be determined according to actual needs. For example, the second side wall 122 surrounds to form a circular ring-shaped side wall, for example, the second side wall 122 surrounds to form a square ring-shaped side wall. It should be noted that the second connecting protrusions 1223 should correspond to the first connecting protrusions 1222 one by one, that is, the connecting holes of the second connecting protrusions 1223 should be connected to the corresponding connecting holes of the first connecting protrusions 1222.

[0107] The second connecting protrusions 1223 are arranged in a surrounding and spaced manner to connect the first box body 110 and the second box body 120, thereby improving the connection stability. At the same time, the second connecting protrusions 1223 correspond to the first connecting protrusions 1222 and can be formed together, which is convenient for mass production of the second box body 120.

[0108] According to some embodiments of this application, please refer to Figure 7 The connecting portion 1221 has a connecting hole 1224 , an insert nut 1225 is provided in the connecting hole 1224 , and the connecting piece 140 is connected to the insert nut 1225 .

[0109] Considering the materials of the first box body 110 and the second box body 120, the specific connection method needs to be adjusted. For example, the first box body 110 and the second box body 120 are injection molded boxes, and the connecting part 1221 is made of plastic material. In order to better connect the two plastic materials, an insert nut 1225 is installed in the connecting hole 1224 of the connecting part 1221, and the connecting member 140 passes through the first side wall 112 of the first box body 110 and enters the connecting hole 1224 to connect and lock with the insert nut 1225, thereby achieving the fixation of the plastic first side wall 112 and the plastic second side wall 122. For example, in order to improve the connection stability, the bolt in the connecting hole 1224 exceeds the insert nut 1225 by at least two threads.

[0110] By installing the insert nut 1225 in the connecting hole 1224 and connecting the connecting piece 140 with the insert nut 1225, the connection and fixing strength between the connecting piece and the insert nut 1225 is improved, so as to meet the connection requirement of the connecting part 1221 with the first side wall 112 under different materials.

[0111] An embodiment of the present application provides an electrical device, which includes the battery 10 in any one of the above embodiments.

[0112] According to some embodiments of this application, please refer to Figure 2 , Figure 4 and Figure 7 The battery 10 includes a battery box 100 and a battery cell 200. The battery box 100 includes a first box body 110 and a second box body 120. The first box body 110 includes a first side wall 112 and a first bottom wall 113; the second box body 120 includes a second side wall 122 and a second bottom wall 123, and the second side wall 122 and the second bottom wall 123 surround and form a receiving cavity 121; the battery cell 200 is located in the receiving cavity 121, the first box body 110 covers the opening of the receiving cavity 121, the second bottom wall 123 is opposite to the first bottom wall 113, the first side wall 112 is located on the outside of the second side wall 122, and the second side wall 122 has a connecting portion 1221, which is connected to the connecting portion 1221 by a connecting member 140 penetrating the first side wall 112.

[0113] The battery box 100 also includes a seal 130, which surrounds the opening of the accommodating cavity 121, and specifically includes a first part 131 and a second part 132. The first part 131 is arranged between the second side wall 122 and the first side wall 112, and the second part 132 is arranged between the second side wall 122 and the first bottom wall 113. Along the first direction, the length d1 of the first part 131 is greater than or equal to 8 mm and less than or equal to 50 mm.

[0114] The connecting portion 1221 has a first connecting protrusion 1222 protruding toward the accommodating cavity 121, and a second connecting protrusion 1223 protruding toward the first side wall 112, and the first connecting protrusion 1222 and the second connecting protrusion 1223 are arranged at intervals around the second side wall 122, and a dimension d2 of the first connecting protrusion 1222 protruding from the second side wall 122 is greater than or equal to 1 mm and less than or equal to 4 mm, and a dimension d3 of the second connecting protrusion 1223 protruding from the second side wall 122 is less than or equal to 3 mm and greater than or equal to 1 mm.

[0115] In addition, the first connecting protrusion 1222 on the connecting portion 1221 is connected to the second bottom wall 123, and the second connecting protrusion 1223 on the connecting portion 1221, the wall thickness of the second side wall 122 and the first connecting protrusion 1222 together form a connected connecting hole 1224, and the connecting hole 1224 has an insert nut 1225. The connecting piece 140 passes through the first side wall 112 and is connected to the insert nut 1225, thereby realizing the connection between the first side wall 112 and the second side wall 122.

[0116] 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: Battery Cell (200); A battery box (100) comprising a first box body (110) and a second box body (120); The first box body (110) comprises a first side wall (112) and a first bottom wall (113); the second box body (120) comprises a second side wall (122) and a second bottom wall (123) surrounding a receiving cavity (121); the opening of the receiving cavity (121) faces the first bottom wall (113); the battery cell (200) is located in the receiving cavity (121); the first box body (110) covers the opening of the receiving cavity (121); the second bottom wall (123) is opposite to the first bottom wall (113); the first side wall (112) is located on the outer side of the second side wall (122) in a circumferential direction; and the first side wall (112) and the second side wall (122) are sealed and connected.

2. The battery according to claim 1, characterized in that The battery box (100) further comprises a sealing member (130), wherein a first portion (131) of the sealing member (130) is located between the first side wall (112) and the second side wall (122).

3. The battery according to claim 2, characterized in that The sealing member (130) further comprises a second portion (132), the first portion (131) being connected to the second portion (132), and the second portion (132) being located between the second side wall (122) and the first bottom wall (113).

4. The battery according to claim 2 or 3, characterized in that: Along a first direction, the length of the first portion (131) is greater than or equal to 8 mm and less than or equal to 50 mm, and the first direction is the extension direction of the first side wall toward the second bottom wall.

5. The battery according to claim 2 or 3, characterized in that: The sealing member (130) surrounds the opening of the accommodating cavity (121).

6. The battery according to any one of claims 1 to 3, characterized in that The second side wall (122) has a connecting portion (1221), and the battery box (100) further comprises: A connecting member (140) passes through the first side wall (112) and is connected to the connecting portion (1221).

7. The battery according to claim 6, characterized in that The connecting portion (1221) comprises a first connecting protrusion (1222) protruding toward the accommodating cavity (121).

8. The battery according to claim 7, characterized in that The dimension of the first connecting protrusion (1222) protruding from the second side wall (122) is greater than or equal to 1 mm and less than or equal to 4 mm.

9. The battery according to claim 7 or 8, characterized in that: The first connecting protrusions (1222) are arranged at intervals around the second side wall (122).

10. The battery according to claim 7 or 8, characterized in that: The first connecting protrusion (1222) is connected to the second bottom wall (123).

11. The battery according to claim 6, characterized in that The connecting portion (1221) further comprises a second connecting protrusion (1223) protruding toward the first side wall (112).

12. The battery according to claim 11, characterized in that The dimension of the second connecting protrusion (1223) protruding from the second side wall (122) is less than or equal to 3 mm and greater than or equal to 1 mm.

13. The battery according to claim 11, characterized in that The second connecting protrusions (1223) are arranged at intervals around the second side wall (122).

14. The battery according to claim 6, characterized in that The connecting portion (1221) has a connecting hole (1224), an insert nut (1225) is provided in the connecting hole (1224), and the connecting piece (140) is connected to the insert nut (1225).

15. An electrical device, characterized in that: The invention comprises a battery as claimed in any one of claims 1 to 14, wherein the battery is used to provide electrical energy.

Images