Battery device, power utilization device and output pole piece

Abstract

The utility model discloses a battery device, a power utilization device and an output pole piece, and relates to the technical field of battery devices. The battery device comprises a battery monomer assembly and an output pole piece, wherein the battery monomer assembly is provided with an electrode terminal; the output pole piece comprises a pole piece body and a first connecting piece, the pole piece body is provided with a first connecting part and a second connecting part, the first connecting part is connected with the electrode terminal, and the second connecting part is used for being connected with an electric device or another battery monomer assembly; the second connecting part is covered with a first connecting sheet; the strength of the first connecting piece is greater than that of the pole piece body; the face, facing the second connecting part, of the first connecting piece is provided with a protruding part, and the protruding part is embedded in the second connecting part. According to the technical scheme, the strength of the output pole piece can be improved, and breakage and deformation of the output pole piece are reduced.

Description

Technical Field

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

[0002] In the related art, a battery device usually includes one or more battery cell assemblies, and a battery cell assembly usually includes one or more battery cells. The battery cell assembly has a positive output electrode and a negative output electrode. The total positive output electrode and the total negative output electrode can be connected to the total positive output electrode and the total negative output electrode of another battery cell assembly or an external circuit through an output electrode sheet. However, existing output electrode sheets have problems of breakage and deformation. Utility Model Content

[0003] In view of the above problems, the present application provides a battery device, an electrical device and an output pole piece, aiming to improve the strength of the output pole piece to reduce the breakage and deformation of the output pole piece.

[0004] In the present application, a battery device comprises:

[0005] a battery cell assembly having electrode terminals; and

[0006] The output pole piece includes a pole piece body and a first connecting piece, wherein the pole piece body has a first connecting portion and a second connecting portion, wherein the first connecting portion is connected to the electrode terminal, and the second connecting portion is used to connect to an electrical device or another battery cell assembly; the second connecting portion is covered with the first connecting piece; the strength of the first connecting piece is greater than the strength of the pole piece body; the first connecting piece has a protrusion on one side facing the second connecting portion, and the protrusion is embedded in the second connecting portion.

[0007] The technical solution of the present application is to cover the second connecting part of the pole piece body with a first connecting piece with greater strength, and provide a protrusion on the side of the first connecting piece facing the second connecting part, and the protrusion is embedded in the second connecting part. The setting of the protrusion can increase the transition area between the pole piece body and the first connecting piece, increase the bonding strength and stability between the pole piece body and the first connecting piece, thereby improving the strength of the output pole piece and reducing the breakage and deformation of the output pole piece.

[0008] In one embodiment, the material of the pole piece body is aluminum, and the material of the first connecting piece is copper. The output pole piece provided in this embodiment has the advantages of strong conductivity, light weight and relatively low cost.

[0009] In one embodiment, the pole piece body is connected to the first connecting piece by extrusion composite molding. In this embodiment, the pole piece body is connected to the first connecting piece by extrusion composite molding. When the two are extruded and composite molded, the atoms of aluminum and copper begin to penetrate and diffuse with each other, and the atoms of copper and aluminum diffuse and combine at the contact interface to form an intermetallic compound (such as copper-aluminum alloy), which enhances the bonding force between the pole piece body and the first connecting piece and reduces the problem of breakage or deformation of the second connecting part under the action of external force.

[0010] In one embodiment, the number of the protrusions is multiple. Thus, by providing multiple protrusions, the contact pressure between the pole piece body and the first connecting piece can be evenly distributed, local high pressure points can be reduced, and the uniformity of the connection stress between the pole piece body and the first connecting piece can be improved.

[0011] In one embodiment, a surface of the first connecting piece facing the pole piece body is defined as an embedding surface, and a plurality of the protrusions are arranged in an array on the embedding surface. In this way, the plurality of the protrusions are arranged in an array on the embedding surface, which can improve the uniform distribution of the contact pressure between the pole piece body and the first connecting piece.

[0012] In one embodiment, the cross-sectional area of ​​the protrusion is reduced from the first connecting piece toward the pole piece body, so as to reduce the problem of excessive local stress on the protrusion, reduce stress concentration at the connection part, and reduce the risk of deformation and fatigue damage of the output pole piece.

[0013] In one embodiment, at least a portion of the first connecting piece is embedded in the second connecting portion. In this way, the first connecting piece is embedded in the second connecting portion, which increases the mechanical bite force between the two. The embedded connection can effectively reduce the sliding and separation of the first connecting piece relative to the second connecting portion, making the connection between the first connecting piece and the second connecting portion more firm and stable.

[0014] In one embodiment, the surface of the second connecting portion that is not embedded with the first connecting piece and is close to the first connecting piece is defined as the first surface, the outer surface of the first connecting piece is defined as the exposed surface, and the first surface and the exposed surface are arranged flush with each other. In this way, by arranging the first surface and the exposed surface flush with each other, that is, the thickness of the output pole piece is uniform.

[0015] In one embodiment, the second connecting portion has two opposite sides along its thickness direction, and the first connecting piece is respectively embedded on the two sides of the second connecting portion. Thus, by respectively embedding the first connecting piece on the two opposite sides of the second connecting portion, the strength of the two connecting surfaces of the output pole piece is improved, thereby improving the overall strength of the output pole piece.

[0016] In one embodiment, the first connection portion includes a first connection segment and a second connection segment, the first connection segment is connected to the electrode terminal, and the second connection segment connects the first connection segment and the second connection segment; the first connection segment and the second connection segment are set at an angle, and / or the second connection segment and the second connection segment are set at an angle. In this embodiment, the first connection segment and the second connection segment are set at an angle, and / or the second connection segment and the second connection segment are set at an angle, so that the structure of the pole piece body has a certain flexibility and deformation space, so that when the battery cell expands, part of the stress can be absorbed by deformation of the angle (such as bending, stretching), so that the stress is dispersed in the entire structure, reducing the local stress concentration phenomenon, and reducing the risk of damage to the output pole piece due to stress concentration.

[0017] In one embodiment, the number of the battery cell assemblies is multiple, and the number of the output pole pieces is multiple; each of the battery cell assemblies has two electrode terminals, one of which is a positive output terminal, and the other is a negative output terminal; each electrode terminal is connected to the pole piece body of an output pole piece. In this embodiment, the battery device is designed to be a plurality of battery cell assemblies and a plurality of output pole pieces, so that the battery device has a modular characteristic, which is convenient for maintaining and replacing a single battery cell assembly or output pole piece without replacing the entire battery device; in addition, the battery device has a modular characteristic, and the capacity of the battery system can be flexibly adjusted by increasing or decreasing the number of battery cell assemblies to meet the needs of different application scenarios.

[0018] In one embodiment, the volume of the output pole piece is defined as V1, the total volume of the first connecting piece is defined as V2, and the ratio between V2 and V1 is not less than 0.25 and not greater than 0.35. In this embodiment, by controlling the volume ratio of the first connecting piece (copper) to between 25% and 35%, a balance can be achieved between cost, conductive performance, and the strength of the pole piece body and the first connecting piece. That is to say, controlling the volume ratio of the first connecting piece (copper) to between 25% and 35% can reduce the overall material cost, provide better conductive performance, and provide better mechanical strength of the connecting part, thereby realizing a lightweight and highly reliable battery device.

[0019] The present application also proposes an electrical device, which includes the battery device described in any of the above embodiments, and the battery device is used to provide electrical energy.

[0020] The present application also proposes an output pole piece, which includes a pole piece body and a first connecting piece. The material of the pole piece body is aluminum. The pole piece body has a first connecting portion and a second connecting portion. The first connecting portion is connected to an electrode terminal of a battery cell assembly, and the second connecting portion is used to connect to an electrical device or another battery cell assembly; the first connecting piece is covered on the second connecting portion, and the strength of the first connecting piece is greater than the strength of the pole piece body; the first connecting piece has a protrusion on the side facing the second connecting portion, and the protrusion is embedded in the second connecting portion.

[0021] In one embodiment, the material of the pole piece body is aluminum, and the material of the first connecting piece is copper.

[0022] In one embodiment, the pole piece body is integrally connected to the first connecting piece by extrusion composite molding.

[0023] 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

[0024] 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:

[0025] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0026] Figure 2 A schematic diagram of the exploded structure of a battery device according to some embodiments of the present application;

[0027] Figure 3 A schematic diagram of the structure of a battery cell assembly according to some embodiments of the present application;

[0028] Figure 4 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0029] Figure 5 This is a schematic diagram of the structure of the output pole piece of some embodiments of the present application;

[0030] Figure 6 for Figure 5 A cross-sectional view from one perspective.

[0031] The reference numerals in the specific implementation manner are as follows:

[0032] 1. Vehicles;

[0033] 10. Battery device;

[0034] 100, battery cell assembly; 101, electrode terminal; 110, housing; 111, end plate; 112, side plate; 120, support seat; 130, battery cell; 131, end cover; 132, housing; 133, battery cell assembly; 134, electrode terminal;

[0035] 200, box body; 210, first part; 220, second part;

[0036] 300, output pole piece; 301, connection hole; 310, pole piece body; 311, first connection portion; 311a, first connection section; 311b, second connection section; 312, second connection portion; 313, first surface; 320, first connection piece; 321, raised portion; 322, fitting surface; 323, exposed surface;

[0037] 20. Controller; 30. Motor.

[0038] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present application will be 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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).

[0045] 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.

[0046] 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.

[0047] 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.

[0048] A battery device usually includes one or more battery cell assemblies, and a battery cell assembly usually includes one or more battery cells. The battery cell assembly has a positive output electrode and a negative output electrode. When the battery cell assembly has multiple battery cells, the positive output electrode and the negative output electrode are usually the total positive output electrode and the total negative output electrode of the multiple battery cells. The positive output electrode and the negative output electrode are connected to the total positive output electrode and the total negative output electrode of another battery cell assembly through an output electrode sheet, or the positive output electrode and the negative output electrode are respectively connected to an external electrical device through an output electrode sheet. However, existing output electrode sheets are usually aluminum output electrode sheets. Since aluminum output electrode sheets have low strength, they are prone to breakage or deformation when subjected to external forces.

[0049] Based on the above considerations, in order to alleviate the problems of fracture and deformation dislocation of the above-mentioned output pole piece, an output pole piece was designed after in-depth research. The pole piece body of the output pole piece is covered with a first connecting piece, and the strength of the first connecting piece is greater than the strength of the pole piece body. In this way, the strength of the output pole piece is enhanced and the fracture or deformation of the second connecting part under the action of external force is reduced.

[0050] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is conducive to alleviating and automatically adjusting the deterioration of the expansion force of the battery cell, replenishing the consumption of the electrolyte, and improving the stability of the battery performance and the battery life.

[0051] 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.

[0052] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0053] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of the vehicle 1 of some embodiments of the present application. The vehicle 1 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 device 10 is provided inside the vehicle 1. The battery device 10 may be provided at the bottom, head or tail of the vehicle 1. The battery device 10 may be used to power the vehicle 1. For example, the battery device 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. The controller 20 is used to control the battery device 10 to power the motor 30, for example, for starting, navigating and operating power requirements of the vehicle 1 during driving.

[0054] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1 , but also serve 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 .

[0055] Please refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of the battery device of some embodiments of the present application; the battery device 10 includes a box 200 and a battery cell 130, and the battery cell 130 is contained in the box 200. Among them, the box 200 is used to provide a storage space for the battery cell 130, and the box 200 can adopt a variety of structures. In some embodiments, the box 200 may include a first part 210 and a second part 220, the first part 210 and the second part 220 cover each other, and the first part 210 and the second part 220 jointly define a storage space for accommodating the battery cell 130. The second part 220 may be a hollow structure with one end open, and the first part 210 may be a plate-like structure, and the first part 210 covers the open side of the second part 220, so that the first part 210 and the second part 220 jointly define a storage space; the first part 210 and the second part 220 may also be hollow structures with one side open, and the open side of the first part 210 covers the open side of the second part 220. Of course, the box body 200 enclosed by the first part 210 and the second part 220 can be in various shapes, such as a cylinder, a cuboid, etc.

[0056] In the battery device 10, there can be multiple battery cells 130, and the multiple battery cells 130 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 130 are both connected in series and in parallel. The multiple battery cells 130 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 130 is accommodated in the box 200;

[0057] Of course, please refer to Figure 2 and Figure 3 , Figure 2 Schematic diagram of the exploded structure of the battery device 10 according to some embodiments of the present application; Figure 3 The structure diagram of the battery cell assembly 100 of some embodiments of the present application; the battery device 10 may also be a form in which a plurality of battery cells 130 are first connected in series or in parallel or in a mixed connection to form a battery cell assembly 100, and the plurality of battery cell assemblies 100 are then connected in series or in parallel or in a mixed connection to obtain a whole, and accommodated in the box 200, or the battery device 10 may have only one battery cell assembly 100, and the battery cell assembly 100 is accommodated in the box 200. The battery device 10 may also include other structures, for example, the battery device 10 may also include a busbar for realizing electrical connection between the plurality of battery cells 130.

[0058] Each battery cell 130 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 130 may be cylindrical, flat, rectangular, or in other shapes.

[0059] Please refer to Figure 4 , Figure 4 Schematic diagram of the decomposition structure of a battery cell in some embodiments of the present application; a battery cell 130 refers to the smallest unit that constitutes a battery. Figure 4 The battery cell 130 includes an end cover 131, a shell 132, a battery cell assembly 133 and other functional components.

[0060] The end cap 131 refers to a component that covers the opening of the shell 132 to isolate the internal environment of the battery cell 130 from the external environment. Without limitation, the shape of the end cap 131 can be adapted to the shape of the shell 132 to match the shell 132. Optionally, the end cap 131 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 131 is not easily deformed when squeezed and collided, so that the battery cell 130 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 134 can be provided on the end cap 131. The electrode terminal 134 can be used to electrically connect to the battery cell assembly 133 for outputting or inputting electrical energy of the battery cell 130. In some embodiments, the end cap 131 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 130 reaches a threshold. The material of the end cap 131 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the present embodiment. In some embodiments, an insulating member can be provided on the inner side of the end cap 131, and the insulating member can be used to isolate the electrical connection components in the housing 132 from the end cap 131 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0061] The shell 132 is a component used to cooperate with the end cap 131 to form the internal environment of the battery cell 130, wherein the formed internal environment can be used to accommodate the battery cell assembly 133, electrolyte and other components. The shell 132 and the end cap 131 can be independent components, and an opening can be set on the shell 132, and the end cap 131 is made to cover the opening at the opening to form the internal environment of the battery cell 130. Without limitation, the end cap 131 and the shell 132 can also be integrated. Specifically, the end cap 131 and the shell 132 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 132, the end cap 131 is made to cover the shell 132. The shell 132 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 132 can be determined according to the specific shape and size of the battery cell assembly 133. The shell 132 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0062] The battery cell assembly 133 is a component in the battery cell 130 where an electrochemical reaction occurs. One or more battery cell assemblies 133 may be contained in the housing 132. The battery cell assembly 133 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main part of the battery cell assembly 133, and the parts of the positive electrode sheet and the negative electrode sheet 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 electrode active material and the negative electrode active material react with the electrolyte, and the pole ear connects the electrode terminal 134 to form a current loop.

[0063] Next, the structure of the battery device 10 proposed in this application is explained:

[0064] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figures 4 to 6 , Figure 3 A schematic diagram of the structure of a battery cell assembly according to some embodiments of the present application; Figure 4 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application; Figure 5 This is a schematic diagram of the structure of the output pole piece of some embodiments of the present application; Figure 6 for Figure 5The battery device 10 comprises a battery cell assembly 100 and an output pole piece 300, wherein the battery cell assembly 100 has an electrode terminal 101; the output pole piece 300 comprises a pole piece body 310 and a first connecting piece 320, wherein the pole piece body 310 has a first connecting portion 311 and a second connecting portion 312, wherein the first connecting portion 311 is connected to an electrode terminal 101, and the second connecting portion 312 is used to connect to an electrical device or another battery cell assembly; the second connecting portion 312 of the pole piece body 310 is covered with a first connecting piece 320; the strength of the first connecting piece 320 is greater than that of the pole piece body 310; the first connecting piece 320 has a protrusion 321 on one side facing the second connecting portion 312, and the protrusion 321 is embedded in the second connecting portion 312.

[0065] The battery cell assembly 100 includes one or more battery cells 130. Generally speaking, the battery cell assembly 100 includes a management system (such as a battery management system), a cooling system, and connection and packaging components to achieve functions such as storage, management, protection and heat dissipation of electrical energy. In this embodiment, the battery device 10 includes one or more battery cell assemblies 100. In an embodiment of multiple battery cell assemblies 100, for example, two, three, four or more battery cell assemblies 100, the connection method between the multiple battery cell assemblies 100 can be parallel, series, or a combination of the two (hybrid).

[0066] The output pole piece 300 is used to connect the battery device 10 to the electric device, and can realize electrical connection between the battery device 10 and the electric device, or the output pole piece 300 is used to connect at least two battery cell assemblies 100 in the battery device 10, and realize electrical connection between the connected battery cell assemblies 100. Exemplarily, in some embodiments, a battery device 10 has multiple battery cell assemblies 100 and multiple output pole pieces 300, some of the output pole pieces 300 are used to connect the battery device 10 to the electric device, and other output pole pieces 300 are used to connect at least two battery cell assemblies 100 in the battery device 10.

[0067] The battery cell assembly 100 has an electrode terminal 101. Generally, there are two electrode terminals 101. The polarities of the two electrode terminals 101 are opposite. Each electrode terminal 101 is connected to an electrical device or other battery cell assembly 100 through an output electrode sheet 300. When the battery cell assembly 100 includes only one battery cell 130, the two electrode terminals 101 are usually the electrode terminals 134 of the battery cell 130. When the battery cell assembly 100 includes multiple battery cells 130, generally speaking, the electrode terminal 101 is understood to be two electrode terminals 134 of multiple battery cells 130 connected in series, in parallel or in mixed connection through a busbar. For example, Figure 3 As shown, multiple battery cells 130 are arranged in sequence along a first direction, and the multiple battery cells 130 are connected in series through a bus bar. At this time, among the two battery cells 130 located at the end, in one of the battery cells 130, the electrode terminal 134 that is not connected to other battery cells 130 serves as the positive electrode terminal of the battery cell assembly 100, and in the other battery cell 130, the electrode terminal 134 that is not connected to other battery cells 130 serves as the negative electrode terminal of the battery cell assembly 100.

[0068] The output pole piece 300 includes a pole piece body 310 . In the present embodiment, the pole piece body 310 has a first connection portion 311 and a second connection portion 312 . The first connection portion 311 of the pole piece body 310 is connected to an electrode terminal 101 , and the second connection portion 312 of the pole piece body 310 is used to connect to an electrical device or another battery cell assembly 100 .

[0069] In one battery device 10, the number of output pole pieces 300 is usually two, and the output pole piece 300 refers to the pole piece body 310 with the second connection portion 312 covered with the first connection piece 320. Of course, there may be one or more, and it may also be adaptively arranged according to the number of battery cell assemblies 100 to be electrically connected. When the number of the pole piece body 310 is one, one of the positive electrode terminal and the negative electrode terminal 101 may be connected to the pole piece body 310, and the other electrode terminal 101 may be connected to another type of pole piece body 310.

[0070] Exemplarily, taking the case where there are two output pole pieces 300 and the output pole piece 300 is used to connect the battery device 10 and the electrical device, the positive electrode terminal and the negative electrode terminal are respectively connected to the pole piece body 310 of an output pole piece 300, that is, the first connection part 311 of an output pole piece 300 is connected to the positive electrode terminal, and the second connection part 312 of the output pole piece 300 is used to connect to the positive pole of the power supply end of the electrical device; the first connection part 311 of another output pole piece 300 is connected to the negative electrode terminal, and the second connection part 312 of the output pole piece 300 is used to connect to the negative pole of the power supply end of the electrical device.

[0071] The first connection portion 311 of the pole piece body 310 is usually connected to an electrode terminal 101 by welding, and the welding connection here is usually more reliable. Of course, crimping and other methods can also be used for connection; the second connection portion 312 of the pole piece body 310 is connected to an electrical device or another battery cell assembly 100, usually by threaded connection. At this time, the second connection portion 312 of the pole piece body 310 is usually provided with a connection hole 301, which makes the stress of the second connection portion 312 of the pole piece body 310 more concentrated than other positions. Of course, the second connection portion 312 of the pole piece body 310 can also be connected to the electrical device or another battery cell assembly 100 by connecting a cable tie or other methods; because the material of the pole piece body 310 is aluminum, its strength is relatively low, and it is easy to break or deform when subjected to external force.

[0072] The second connection part 312 is covered with the first connection sheet 320, that is, the first connection sheet is covered or arranged on the pole piece body, and the "covering" at this time can be understood as the first connection sheet is in direct contact with the second connection part 312 of the pole piece body 310 in physical position and covers part or all of its surface. The composite connection method of the second connection part 312 and the first connection sheet 320 can be welding (usually molecular welding, laser welding, ultrasound, electromagnetic pulse, etc.), compression molding (under a certain temperature and pressure, the copper sheet and the aluminum sheet are pressed together to achieve metal bonding through thermal diffusion) or extrusion composite molding (which will be elaborated in detail later), etc.

[0073] The strength of the first connecting piece 320 is greater than that of the pole piece body 310, that is, when the first connecting piece 320 or the pole piece body 310 is compared under the same force conditions, the first connecting piece 320 can withstand a greater external force without deformation, fracture or other forms of damage. At this time, it should be understood that the first connecting piece 320 is more resistant to damage by external forces than the pole piece body 310, or that under the same external force, the first connecting piece 320 is less likely to be damaged.

[0074] Exemplarily, the material of the pole piece body 310 is usually aluminum, which has excellent conductivity and is relatively light. Therefore, as the pole piece body 310, it can effectively improve the conductivity of the battery, thereby improving the overcurrent capacity of the output pole piece 300. The lightweight characteristics of aluminum can also reduce the overall weight of the battery device 10; the material of the first connecting plate 320 is usually copper, nickel or titanium, etc.; the strength of these materials is much higher than that of aluminum, and can withstand greater mechanical loads, thereby improving the strength of the output pole piece 300.

[0075] Further, the first connecting piece 320 has a protrusion 321 on one side facing the second connecting portion 312, and the protrusion 321 is embedded in the second connecting portion 312. The first connecting piece 320 has a protrusion 321 on one side facing the second connecting portion 312, that is, the protrusion 321 refers to a protruding portion located on one side of the first connecting piece 320 facing the pole piece body 310, and the protrusion 321 is a part of the first connecting piece 320. For example, it can be understood that the protrusion 321 and the main body of the first connecting piece 320 are integrally formed, and the materials of the protrusion 321 and the main body of the first connecting piece 320 are both copper.

[0076] The raised portion 321 may be a convex block or a convex strip, etc. The convex strip is a strip-shaped protrusion extending along the surface of the connecting piece or the metal reflector, which may be straight, curved or wavy, etc. The number of the raised portions 321 may be one or more, for example, one, two, three, four, five, six or more than six. The provision of the raised portion 321 may increase the contact area between the first connecting piece 320 and the pole piece body 310, thereby improving the stability and reliability of the connection between the first connecting piece 320 and the pole piece body 310, and enhancing the ability of the output pole piece 300 to resist external forces.

[0077] The technical solution of the present application is to cover the second connecting part of the pole piece body with a first connecting piece 320 with greater strength, and have a protrusion 321 on the side of the first connecting piece 320 facing the second connecting part 312, and the protrusion 321 is embedded in the second connecting part 312. The setting of the protrusion 321 can increase the transition area between the pole piece body 310 and the first connecting piece 320, increase the bonding strength and stability between the pole piece body 310 and the first connecting piece 320, thereby improving the strength of the output pole piece 300 and reducing the breakage and deformation of the output pole piece 300.

[0078] In one embodiment, the material of the pole piece body 310 is aluminum, and the material of the first connecting piece 320 is copper.

[0079] In this embodiment, aluminum has excellent conductivity and is relatively light. Therefore, as the pole piece body 310, it can effectively improve the conductivity of the battery, thereby improving the overcurrent capacity of the output pole piece 300. The lightweight characteristics of aluminum can also reduce the overall weight of the battery device 10. Compared with nickel or titanium, copper has a low cost, and the composite process of copper and aluminum is relatively easy.

[0080] In an exemplary embodiment, the material of the pole piece body 310 is aluminum, and the material of the first connecting piece 320 is copper; the pole piece body 310 is connected to the first connecting piece 320 by extrusion composite molding.

[0081] Among them, the material of the pole piece body 310 is aluminum, and the melting point of aluminum is about 600 degrees Celsius. The material of the first connecting piece 320 is copper, and the melting point of copper is about 1200 degrees Celsius. When the pole piece body 310 is connected to the first connecting piece 320 by extrusion composite molding, the heating temperature is 700 degrees Celsius to 800 degrees Celsius. At this time, the copper layer is in a solid state, but has a certain plasticity, and the aluminum is in a molten state. When the two are extruded and composited, the atoms of aluminum and copper begin to penetrate and diffuse with each other, and the atoms of copper and aluminum diffuse at the contact interface to form an intermetallic compound (such as copper-aluminum alloy), which enhances the bonding force between the pole piece body 310 and the first connecting piece 320, and also enhances the strength of the output pole piece 300, reducing the problem of fracture or deformation of the second connecting portion 312 under the action of external force.

[0082] In this embodiment, the second connecting portion 312 is covered with a first connecting piece 320 made of copper, the second connecting portion 312 is used to connect to an electrical device or another battery cell assembly 100, and the pole piece body 310 is connected to the first connecting piece 320 by extrusion composite molding; when the two are extruded and composite molded, the atoms of aluminum and copper begin to penetrate and diffuse with each other, and the atoms of copper and aluminum diffuse at the contact interface to form an intermetallic compound (such as a copper-aluminum alloy), thereby enhancing the connection between the pole piece body 310 and the first connecting piece 320. 0 bonding force, reducing the breakage or deformation problem of the second connecting part 312 under the action of external force; in addition, the first connecting piece 320 has a protrusion 321 on the side facing the second connecting part 312, and the protrusion 321 is embedded in the second connecting part 312. The setting of the protrusion 321 can increase the contact area between the first connecting piece 320 and the pole piece body 310, increase the transition area between aluminum and copper, further improve the stability and reliability of the connection between the first connecting piece 320 and the pole piece body 310, and the strength of the output pole piece 300.

[0083] In some embodiments, there are multiple protrusions 321 .

[0084] Increasing the contact area between the pole piece body 310 and the first connecting piece 320 can be achieved by providing multiple protrusions 321 or increasing the size of a single protrusion. In this embodiment, by providing multiple protrusions 321, the contact pressure between the pole piece body 310 and the first connecting piece 320 can be evenly distributed, reducing local high-pressure points, thereby improving the uniformity of the connection stress between the pole piece body 310 and the first connecting piece 320.

[0085] In some embodiments, see Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of the output pole piece 300 of some embodiments of the present application; Figure 6 for Figure 5 A side of the first connecting piece 320 facing the pole piece body 310 is defined as a fitting surface 322 , and a plurality of protrusions 321 are arranged in an array on the fitting surface 322 .

[0086] The mating surface 322, such as Figure 6 As shown, a plurality of protrusions 321 are arranged in an array on the embedding surface 322 on one side of the embedded pole body 310, which may be arranged in a ring array or in a square array. Further, among the plurality of protrusions 321, the distance between two adjacent protrusions 321 is equal.

[0087] In this embodiment, a plurality of protrusions 321 are arranged in an array on the fitting surface 322 , which can improve the uniformity of the contact pressure distribution between the pole piece body 310 and the first connecting piece 320 .

[0088] In some embodiments, the cross-sectional area of ​​the protrusion 321 decreases from the first connecting piece 320 toward the pole piece body 310 .

[0089] The cross-sectional area refers to the area of ​​a section perpendicular to a certain direction. In the present embodiment, it refers to the area of ​​the protrusion 321 cut by a plane perpendicular to the direction from the first connecting piece 320 toward the pole piece body 310.

[0090] It is understandable that when the cross-sectional area of ​​the protrusion 321 gradually decreases, the shape of the connection part between the protrusion 321 and the pole piece body 310 will tend to be more smoothly transitioned, thus reducing the sudden cross-sectional change and stress concentration, so that the stress is more evenly distributed in the entire transition area. After the stress concentration is reduced, the local stress peak will be reduced accordingly, reducing the probability of local failure of the material.

[0091] In this embodiment, the cross-sectional area of ​​the protrusion 321 is reduced from the first connecting piece 320 toward the pole piece body 310. Exemplarily, the protrusion 321 is a conical or wedge-shaped structure. In this way, the cross-sectional area of ​​the protrusion 321 is reduced from the first connecting piece 320 toward the pole piece body 310, which can reduce the problem of excessive local stress on the protrusion 321, reduce stress concentration at the connection position, and reduce the risk of deformation and fatigue damage of the output pole piece 300.

[0092] In some embodiments, at least a portion of the first connecting piece 320 is embedded in the second connecting portion 312 .

[0093] Part of the first connecting piece 320 may be embedded in the second connecting portion 312, or all of the first connecting piece 320 may be embedded in the second connecting portion 312. Generally speaking, Figure 4 and Figure 5 As shown, one side of the first connecting piece 320 is exposed, serving as a contact surface for connecting the pole piece body 310 with other components.

[0094] In this embodiment, the first connecting piece 320 is embedded in the second connecting part 312, thereby increasing the mechanical bite force between the two. The embedded connection can effectively reduce the sliding and separation of the first connecting piece 320 relative to the second connecting part 312, thereby making the connection between the first connecting piece 320 and the second connecting part 312 more firm and stable; secondly, by partially embedding the first connecting piece 320 in the second connecting part 312, an integral composite structure is obtained, so that the composite structure can withstand greater external forces, thereby improving the overall strength and rigidity of the output pole piece 300; thereby further reducing the problem of breakage or deformation of the second connecting part 312 under the action of external forces.

[0095] In some embodiments, see Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of the output pole piece 300 of some embodiments of the present application; Figure 6 for Figure 5 The surface of the second connecting portion 312 that is not embedded with the first connecting piece 320 and close to the first connecting piece 320 is defined as the first surface 313, and the outer surface of the first connecting piece 320 is defined as the exposed surface 323. The first surface 313 and the exposed surface 323 are arranged flush.

[0096] When the cross-sectional thickness of the output pole piece 300 is inconsistent, the first connecting piece 320 is on the surface of the pole piece body 310. Since the material of the first connecting piece 320 is copper and the material of the pole piece body 310 is aluminum, the copper-aluminum surface bonding force is poor, and stratification is easily produced during bending and stamping, and the bonding layer is easily acid-reacted and stratified during electroplating.

[0097] In this embodiment, the first surface 313 and the exposed surface 323 are arranged flush, that is, the thickness of the output pole piece 300 is uniform, thereby further reducing the breakage and deformation of the output pole piece 300 .

[0098] In some embodiments, the second connection portion 312 has two opposite sides along the thickness direction thereof, and the first connection pieces 320 are respectively embedded in the two sides of the second connection portion 312 .

[0099] The second connection part 312 has two opposite sides along its thickness direction, which means that there are two side surfaces in the thickness direction of the second connection part 312, the two side surfaces are opposite to each other, and the two side surfaces are separated by the main body of the second connection part 312. The first connection pieces 320 are respectively embedded on the two sides of the second connection part 312, and the first connection piece 320 is embedded or fixed on each side surface.

[0100] In this embodiment, by embedding the first connecting pieces 320 on the opposite sides of the second connecting portion 312, the strength of the two connecting surfaces of the output pole piece 300 is improved, thereby improving the overall strength of the output pole piece 300 and further reducing the breakage and deformation of the output pole piece 300.

[0101] In some embodiments, the first connecting portion 311 includes a first connecting segment 311a and a second connecting segment 311b, the first connecting segment 311a is connected to the electrode terminal 101, and the second connecting segment 311b connects the first connecting segment 311a and the second connecting portion 312; the first connecting segment 311a and the second connecting segment 311b are arranged at an angle, and / or the second connecting segment 311b and the second connecting portion 312 are arranged at an angle.

[0102] The first connecting segment 311a and the second connecting segment 311b are arranged at an angle, wherein the angle arrangement means that the two connecting segments are connected to each other at a certain angle (non-zero degree and non-180 degrees). This arrangement can be regarded as an intermediate state between the bending arrangement and the curving arrangement, which can be either a sharp angle or a relatively smooth curve transition.

[0103] In this embodiment, the first connecting section 311a and the second connecting section 311b are arranged at an angle, and / or the second connecting section 311b and the second connecting portion 312 are arranged at an angle, so that the structure of the pole piece body 310 has a certain flexibility and deformation space. In this way, when the battery cell expands, part of the stress can be absorbed by deformation of the angle (such as bending, stretching), so that the stress is dispersed in the entire structure, reducing local stress concentration and reducing the risk of damage to the output pole piece 300 due to stress concentration.

[0104] In some embodiments, see Figure 2 and Figure 3 , Figure 2 Schematic diagram of the exploded structure of the battery device 10 according to some embodiments of the present application; Figure 3 This is a schematic diagram of the structure of a battery cell assembly 100 of some embodiments of the present application; there are multiple battery cell assemblies 100 and multiple output pole pieces 300; each battery cell assembly 100 has two electrode terminals 101, one electrode terminal 101 is a positive output terminal, and the other electrode terminal 101 is a negative output terminal; each electrode terminal 101 is connected to a pole piece body 310 of an output pole piece 300.

[0105] In this embodiment, the battery device 10 is designed to be composed of a plurality of battery cell assemblies 100 and a plurality of output pole pieces 300, so that the battery device 10 has modular characteristics, which facilitates the maintenance and replacement of a single battery cell assembly 100 or an output pole piece 300 without replacing the entire battery device 10; in addition, the battery device 10 has modular characteristics, and the capacity of the battery system can be flexibly adjusted by increasing or decreasing the number of battery cell assemblies 100 to meet the needs of different application scenarios.

[0106] In some embodiments, the battery cell assembly 100 includes an outer shell 110, a support seat 120 and a battery cell 130, the support seat 120 is arranged outside the outer shell 110; the battery cell 130 is arranged inside the outer shell 110, the battery cell 130 has an electrode terminal 101, the support seat 120 is provided with a positioning groove, the second connecting part 312 is provided in the positioning groove, and the connecting part is provided with a connecting hole 301 for connecting with the support seat 120.

[0107] The battery cell 130 is the basic unit of the battery cell assembly 100, which is responsible for storing and providing electrical energy. Each battery cell 130 has one or more electrode terminals 101 for connecting to an external circuit; each battery cell 130 has an electrode terminal 101 for electrical connection, and the electrode terminal 101 includes a positive output terminal and a negative output terminal, so that the battery cell assembly 100 can output and input electrical energy normally.

[0108] The outer shell 110 is the outer protective structure of the battery cell assembly 100, which is used to accommodate the battery cell 130 and other components while providing physical protection and safeguard. The support base 120 is a component located outside the outer shell 110, which is used to support and fix the battery cell 130 or other internal components. The support base 120 and the outer shell 110 can be an integrally formed setting.

[0109] Taking the square shell battery as an example, the outer shell 110 includes two end plates 111 and two side plates 112 arranged opposite to each other. The two end plates 111 are respectively arranged at the two ends of the arrangement direction of the battery cells 130. Usually, both end plates 111 are provided with a support seat 120. The end plates 111 and the support seat 120 can be arranged separately or integrally.

[0110] The positioning groove on the support base 120 is used to position and fix the various components in the battery cell assembly 100; illustratively, the support base 120 is provided with a fixing hole in the positioning groove, and the fixing hole is usually a threaded hole; the second connecting portion 312 is provided in the positioning groove, and its position corresponds to the fixing hole, and the second connecting portion 312 is provided with a connecting hole 301, and the connecting hole 301 is aligned with the fixing hole. The connecting hole 301 can be a threaded hole or a bare hole, and the fastener passes through the connecting hole 301 and the fixing hole to fix the second connecting portion 312 to the support base 120.

[0111] The fastener is an element used to fix the second connection part 312 on the support base 120, such as a bolt, a nut, a rivet, etc. Exemplarily, the fastener passes through the connection hole 301 and the fixing hole, and the two are firmly connected together by tightening or riveting.

[0112] In this embodiment, the output pole piece 300 is fixed in the housing 110 by the support base 120 and the fasteners, so that the battery cell 130 or other components can be easily disassembled and replaced.

[0113] In some embodiments, the volume of the output pole piece 300 is defined as V1, the total volume of the first connecting piece 320 is defined as V2, and the ratio between V2 and V1 is not less than 0.25 and not greater than 0.35.

[0114] The total volume of the first connecting sheet 320 is V2, which refers to the total volume of all the first connecting sheets 320 covered on one pole piece body 310. For example, when there are two first connecting sheets 320, V2 refers to the total volume of the two first connecting sheets 320. The ratio between V2 and V1 is not less than 0.25 and not greater than 0.35, that is, the volume ratio of copper is between 25% and 35%.

[0115] Copper has better conductivity than aluminum, but using pure copper material will increase cost and weight. By using copper (first connecting piece 320) at key connection parts and controlling its volume ratio to 25% to 35%, better conductivity can be provided on the main current path, reducing the resistance and energy loss of the connection parts, and providing sufficient conductivity while minimizing the amount of copper.

[0116] Aluminum has good mechanical strength, while copper provides higher strength and reliability at the connection parts. By controlling the volume proportion of copper between 25% and 35%, the lightweight characteristics of aluminum material can be used to improve the overall performance of the entire output pole piece 300 while ensuring good mechanical strength at the connection parts.

[0117] The cost difference between aluminum and copper is large, and aluminum is relatively cheaper. If the volume ratio of the first connecting plate 320 (copper) is controlled between 25% and 35%, most of the volume of the output pole piece 300 is composed of aluminum material. This configuration can significantly reduce material costs. The density of aluminum is about 2.7 g / cm³, while the density of copper is about 8.96 g / cm³. By limiting the volume ratio of copper material to 25% to 35%, the weight of the output pole piece 300 can be reduced.

[0118] Aluminum has good heat dissipation performance. As the main material of the pole piece body 310, it helps to dissipate heat and reduce the heat accumulation problem of the battery cell assembly 100 under high current operation. The use of copper material in key parts can further evenly disperse heat, reduce local overheating, and thus improve the overall thermal management performance.

[0119] In this embodiment, by controlling the volume proportion of the first connecting sheet 320 (copper) to be between 25% and 35%, a balance can be achieved between cost, conductivity, and strength of the electrode body 310 and the first connecting sheet 320. That is to say, controlling the volume proportion of the first connecting sheet 320 (copper) to be between 25% and 35% can reduce the overall material cost and provide better conductivity, and can also provide better mechanical strength of the connection parts, thereby realizing a lightweight and highly reliable battery device 10.

[0120] The present application also proposes an output pole piece 300, which includes a pole piece body 310 and a first connecting piece 320. The pole piece body 310 is made of aluminum and has a first connecting portion 311 and a second connecting portion 312. The first connecting portion 311 of the pole piece body 310 is connected to an electrode terminal 101 of a battery cell assembly 100; the first connecting piece 320 is covered on the second connecting portion 312. The first connecting piece 320 is made of copper. The pole piece body 310 is connected to the first connecting piece 320 by extrusion composite molding; the second connecting portion 312 of the pole piece body 310 is used to connect to an electrical device or another battery cell assembly 100; the first connecting piece 320 has a protrusion 321 on one side facing the second connecting portion 312, and the protrusion 321 is embedded in the second connecting portion 312.

[0121] The technical effect of this solution is the same as that of the first embodiment. In addition, in this embodiment, it is taken into consideration that, in actual application, the pole piece body 310 and the first connecting piece 320 are usually first connected by extrusion composite molding, and then welded to the electrode terminal 101 of the battery cell assembly 100 in another process or section, and then assembled and connected with other battery cell assemblies 100 through adapters in other processes or sections to connect the second connecting parts 312 of the two battery cell assemblies 100.

[0122] In this embodiment, the first connecting piece 320 is embedded in the second connecting part 312, thereby increasing the mechanical bite force between the two. The embedded connection can effectively reduce the sliding and separation of the first connecting piece 320 relative to the second connecting part 312, thereby making the connection between the first connecting piece 320 and the second connecting part 312 more firm and stable; secondly, by partially embedding the first connecting piece 320 in the second connecting part 312, an integral composite structure is obtained, so that the composite structure can withstand greater external forces, thereby improving the overall strength and rigidity of the second connecting part 312; thereby further reducing the problem of breakage or deformation of the second connecting part 312 under the action of external forces.

[0123] The present application also proposes an electrical device, which includes a battery device 10 of any of the above embodiments, and the battery device 10 is used to provide electrical energy. The specific structure of the battery device 10 refers to the above embodiments. Since the present electrical device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the battery device 10 is used to provide electrical energy, and the electrical device can be an electric car, an electric motorcycle, an electric bicycle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc.

[0124] 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 device, characterized in that: include: A battery cell assembly having electrode terminals; as well as The output pole piece comprises a pole piece body and a first connecting piece, wherein the pole piece body has a first connecting portion and a second connecting portion, wherein the first connecting portion is connected to the electrode terminal, and the second connecting portion is used to connect to an electric device or another battery cell assembly; the second connecting portion is covered with the first connecting piece; and the strength of the first connecting piece is greater than the strength of the pole piece body; A side of the first connecting piece facing the second connecting portion has a protrusion, and the protrusion is embedded in the second connecting portion.

2. The battery device according to claim 1, characterized in that The material of the pole piece body is aluminum, and the material of the first connecting piece is copper.

3. The battery device according to claim 2, characterized in that: The pole piece body is connected to the first connecting piece in one piece by extrusion composite molding.

4. The battery device according to claim 3, characterized in that: The number of the protrusions is plural.

5. The battery device according to claim 4, characterized in that: A surface of the first connecting piece facing the pole piece body is defined as an embedding surface; and a plurality of protrusions are arranged in an array on the embedding surface.

6. The battery device according to claim 4, characterized in that: The cross-sectional area of ​​the protrusion is reduced in a direction from the first connecting piece toward the pole piece body.

7. The battery device according to any one of claims 1 to 6, characterized in that: At least a portion of the first connecting piece is embedded in the second connecting portion.

8. The battery device according to claim 7, characterized in that: A surface of the second connecting portion that is not embedded with the first connecting piece and is close to the first connecting piece is defined as a first surface, an outer surface of the first connecting piece is defined as an exposed surface, and the first surface and the exposed surface are arranged flush with each other.

9. The battery device according to any one of claims 1 to 6, characterized in that: The second connection portion has two opposite sides along the thickness direction thereof, and the first connection pieces are respectively disposed on the two sides of the second connection portion.

10. The battery device according to any one of claims 1 to 6, characterized in that: The first connecting portion includes a first connecting segment and a second connecting segment, the first connecting segment is connected to the electrode terminal, and the second connecting segment connects the first connecting segment and the second connecting portion; The first connecting section and the second connecting section are arranged at an angle, and / or the second connecting section and the second connecting portion are arranged at an angle.

11. The battery device according to any one of claims 1 to 6, characterized in that: There are multiple battery cell assemblies and multiple output pole pieces; each battery cell assembly has two electrode terminals, one of which is a positive output terminal and the other is a negative output terminal; each electrode terminal is connected to the pole piece body of an output pole piece.

12. The battery device according to claim 1, wherein: The volume of the output pole piece is defined as V1, the total volume of the first connecting piece is defined as V2, and the ratio between V2 and V1 is not less than 0.25 and not more than 0.

35.

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

14. An output pole piece, characterized in that: include: A pole piece body, the pole piece body having a first connection portion and a second connection portion, the first connection portion being connected to an electrode terminal of a battery cell assembly, and the second connection portion being used to connect to an electrical device or another battery cell assembly; and The first connecting piece is covered on the second connecting part, and the strength of the first connecting piece is greater than the strength of the pole piece body; the first connecting piece has a protrusion on one side facing the second connecting part, and the protrusion is embedded in the second connecting part.

15. The output pole piece according to claim 14, characterized in that: The material of the pole piece body is aluminum, and the material of the first connecting piece is copper.

16. The output pole piece according to claim 15, characterized in that: The pole piece body is connected to the first connecting piece in one piece by extrusion composite molding.

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