CN220527136U - Battery connecting device, battery and electricity utilization device - Google Patents

Abstract

The application relates to the technical field of batteries and discloses a battery connecting device, a battery and an electric device, wherein the battery connecting device comprises a converging piece, a sampling circuit board and a conductive connecting piece, the converging piece is used for being connected with an electrode terminal of the battery, and the sampling circuit board is provided with a sampling conductor; the conductive connecting piece comprises a first connecting portion and a second connecting portion which are formed in a compounding mode, the first connecting portion is connected with the second connecting portion in a conductive mode, the material of the first connecting portion is identical to that of the collecting piece, the first connecting portion is welded with the collecting piece, the material of the second connecting portion is identical to that of the sampling conductor, and the second connecting portion is welded with the sampling conductor. The welding between the conductive connecting piece and the bus piece and the sampling conductor is not affected by different materials, so that the connection stability is improved, the reliability of parameter acquisition by the sampling circuit board is improved, the cost of the conductive connecting piece is lower, the cost of the battery connecting device is reduced, and the preparation cost of the battery is reduced.

Description

Battery connecting device, battery and electricity utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a battery connecting device, a battery and an electric device.

Background

This section provides only background information related to the present application and is not necessarily prior art.

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

The manufacturing cost of the battery has a great influence on popularization and application of the battery, and how to reduce the manufacturing cost of the battery is always the focus of battery research and development. In a battery, it is generally required to collect relevant parameters of the battery (such as voltage of the battery) so as to manage the battery, and in some technologies, in order to make the sampling have better reliability, the cost of a component for collecting relevant parameters of the battery is generally higher, and how to make the parameter collection have better reliability on the basis of low cost is a problem to be solved.

Disclosure of Invention

In view of the above, the present application provides a battery connection device, a battery and an electricity consumption device, which can make collection of parameters such as voltage of the battery have better stability, and can reduce manufacturing cost of the battery connection device, thereby reducing manufacturing cost of the battery.

A first aspect of the present application proposes a battery connecting device including a bus bar for connecting with an electrode terminal of a battery, a circuit board and a conductive connecting member; the sampling circuit board is provided with a sampling conductor; the conductive connecting piece comprises a first connecting portion and a second connecting portion which are formed in a compounding mode, the first connecting portion is connected with the second connecting portion in a conductive mode, the material of the first connecting portion is the same as that of the confluence piece, the first connecting portion is welded with the confluence piece, the material of the second connecting portion is the same as that of the sampling conductor, and the second connecting portion is welded with the sampling conductor.

In the technical scheme of this embodiment, can gather the voltage isoparameter of battery through sampling circuit board to manage the battery, specifically, electrically conductive connecting piece passes through first connecting portion and second connecting portion respectively with the welding of converging piece and sampling conductor, realizes the electricity between sampling circuit board and the converging piece and is connected, because converging piece when assembling to the battery, converging piece can be connected with the electrode terminal of battery, like this, sampling circuit board can gather the voltage isoparameter of battery through converging piece. Compared with a conductor made of the same material (the conductor is usually required to be suitable for welding with a bus bar and a sampling conductor at the same time), the conductive connecting piece of the embodiment adopts the first connecting part and the second connecting part which are formed by compounding, and the welding between the conductive connecting piece and the bus bar and the sampling conductor is not affected by different materials, so that the connection stability is improved, the reliability of parameter acquisition by a sampling circuit board is improved, the cost of the conductive connecting piece is lower, and the cost of a battery connecting device is reduced, so that the preparation cost of a battery is reduced.

In addition, the battery connecting device according to the present application may further have the following additional technical features:

in some embodiments of the present application, the first connection portion includes a first connection face and a first composite face, the second connection portion includes a second connection face and a second composite face, the first composite face is laminated and compounded with the second composite face, the first connection face is laminated and welded with the busbar, and the second connection face is laminated and welded with the sampling conductor. Through first compound face and the laminating of second compound face, first connecting face and collector laminating welding, second connecting face and sampling conductor laminating welding for whole battery connecting device has better connection stability, has improved the reliability of battery connecting device sampling.

In some embodiments of the present application, the first connection portion extends from the busbar towards the sampling conductor, the first connection portion has a first end and a second end opposite to each other, the first end is located at one side of the busbar, the second end is located at one side of the sampling circuit board where the sampling conductor is disposed, the first connection face is disposed at one side of the first end towards the busbar, and the first composite face is disposed at one side of the second end towards the sampling conductor. The first connecting part is simple in structure, and the conductive connecting piece, the confluence piece and the sampling circuit board are convenient to assemble.

In some embodiments of the present application, the second connection portion is disposed on a side of the sampling circuit board where the sampling conductor is disposed, the second connection surface and the second composite surface are opposite surfaces of the second connection portion, the second composite surface is disposed toward the first composite surface, and the second connection surface is disposed toward the sampling conductor. The second connecting portion of the embodiment is simple in structure, the second connecting surface faces away from the first composite surface and faces towards the sampling conductor, and the second connecting portion is convenient to be welded and connected with the sampling conductor.

In some embodiments of the present application, the bus bar and the sampling circuit board are located on the same side of the conductive connection. When the confluence piece and the sampling circuit board are arranged on the battery monomer, the conductive connecting piece can be positioned on one side of the confluence piece and the sampling circuit board, which is away from the battery monomer, so that the installation influence of the conductive connecting piece on the confluence piece and the sampling circuit board is reduced, and the tight arrangement of components is facilitated.

In some embodiments of the present application, the first connection portion has a first side surface and a second side surface that are oppositely disposed, the bus member and the sampling circuit board are both located on a side of the first side surface facing away from the second side surface, the first connection surface and the first composite surface are both located on the first side surface, along a direction perpendicular to the first side surface, the first connection surface and the first composite surface are disposed at intervals, and the first connection surface is located on a side of the first composite surface facing away from the second side surface; the second connecting surface is flush with the first connecting surface. The first connecting surface and the second connecting surface flush setting of the conductive connecting piece of this embodiment, at the in-process of welding conductive connecting piece and busbar and sampling circuit board, conductive connecting piece can be by first connecting surface and second connecting surface steady support, and after the welding, has higher connection stability.

In some embodiments of the present application, the busbar comprises an aluminum row, the first connection portion comprises an aluminum portion, and the aluminum row is welded to the aluminum portion; and/or the sampling conductor comprises a copper wire, the second connection part comprises a copper part, and the copper wire is welded with the copper part; and/or, the sampling circuit board comprises a flexible circuit board.

In some embodiments of the present application, the first connection portion is connected with the busbar through a first fusion welding portion, and a material of the first fusion welding portion, a material of the first connection portion, and a material of the busbar are the same. The welding between the first connecting portion and the converging piece is easier, so that the welding stability of the first connecting portion and the converging piece is improved, and the sampling stability of the battery connecting device is further improved.

In some embodiments of the present application, the second connection portion is connected to the sampling conductor through a second fusion welding portion, and a material of the second fusion welding portion, a material of the second connection portion, and a material of the sampling conductor are the same. Welding between the sampling conductor of second connecting portion and sampling circuit board is comparatively easy, has improved the welding stability of second connecting portion and sampling circuit board, and then has improved battery connecting device's sampling stability.

In some embodiments of the present application, a concave-convex mating structure is disposed between the first and second composite surfaces. The stability of the combination of the first combination surface and the second combination surface can be improved through the concave-convex matching structure, the contact area of the first combination surface and the second combination surface can be increased, and the overcurrent capacity of the first connection part and the second connection part is improved.

A second aspect of the present application proposes a battery comprising a battery cell having an electrode terminal and a battery connection device as proposed herein or in any embodiment thereof, the bus bar of the battery connection device being connected with the electrode terminal.

A third aspect of the present application proposes an electrical device comprising a battery as proposed herein for providing electrical energy.

The battery and the electricity utilization device provided by the application comprise the battery connecting device provided by the application or any embodiment of the application, and at least have the beneficial effects of the battery connecting device provided by the application or any embodiment of the application.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 schematically illustrates a schematic structural view of a vehicle provided in some embodiments of the present application;

fig. 2 schematically illustrates an exploded view of a battery provided in some embodiments of the present application;

fig. 3 schematically illustrates an exploded structural view of a battery cell provided in some embodiments of the present application;

fig. 4 schematically illustrates an internal structural schematic view of a battery according to some embodiments of the present application;

fig. 5 schematically illustrates an enlarged view of the portion a of fig. 4;

fig. 6 schematically illustrates a schematic view of a battery connection device according to some embodiments of the present application;

FIG. 7 schematically illustrates a schematic view of a conductive connection according to some embodiments of the present application;

FIG. 8 schematically illustrates a cross-sectional view of a conductive connection according to some embodiments of the present application;

fig. 9 schematically illustrates a cross-sectional view of a conductive connection applying for some embodiments.

Reference numerals in the specific embodiments are as follows:

1000. a vehicle;

100. a battery; 10. a case; 11. a first portion; 12. a second portion; 20. a battery cell; 21. an end cap; 211. an electrode terminal; 212. a pressure relief assembly; 22. a housing; 23. a cell assembly; 231. a tab;

200. a controller;

300. a motor;

400. a confluence member;

500. a sampling circuit board; 510. sampling conductors;

600. a conductive connection; 610. a first connection portion; 611. a first connection surface; 612. a first composite surface; 613. a first end; 614. a second end; 615. a first side; 616. a second side; 620. a second connecting portion; 621. a second composite surface; 622. a second connection surface; 630. a first fusion welding part; 640. a second fusion welding part; 650. concave-convex matching structure.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

The battery can be applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, and also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, military equipment, aerospace and the like. With the increasing field of battery application, the market demand for the same is increasing.

In order to facilitate management of the battery, it is often necessary to collect relevant parameters of the battery, such as voltages of a plurality of battery cells constituting the battery. In some technologies, a sampling circuit board is used for collecting voltages of the battery monomers, specifically, a plurality of battery monomers can be included in the battery, electrode terminals of the battery monomers are connected with an aluminum row, the aluminum row connects the battery monomers in series or in parallel, and the sampling circuit board is used for realizing sampling of the battery monomer pieces through nickel sheets. One end of the nickel sheet is welded with a copper wire (namely a conductor in a sampling circuit on the sampling circuit board) on the sampling circuit board through reflow soldering, and the other end of the nickel sheet is welded with an aluminum row through laser soldering, so that the aluminum row is connected with the sampling circuit board, and the function of collecting the voltage of the battery unit is realized.

The nickel sheet is made of noble metal nickel, and the cost is high. In order to reduce the cost, some technologies try to replace metal nickel with low-cost metal materials to realize connection between the aluminum row and the sampling circuit board, but in research, the sampling reliability of the sampling circuit board is lower when the low-cost metal materials are used as connecting pieces. On the basis of low cost, the sampling circuit board has better reliability for parameter acquisition, and the sampling circuit board becomes a problem to be solved in battery research and development.

Through researches, the copper wires and the aluminum bars of the sampling circuit board are different in material, and when the connecting piece is made of low-cost metal materials, the connecting piece is difficult to be stably welded with the copper wires and the aluminum bars of the sampling circuit board at the same time, which is an important reason for lower sampling reliability of the sampling circuit board. Based on this, in order to make sampling circuit board have better reliability to parameter acquisition on the basis of low cost, this application provides a battery connecting device, including converging piece, sampling circuit board and electrically conductive connecting piece, wherein, electrically conductive connecting piece can be combined material, specific first connecting portion and the second connecting portion that can form including the complex, the material of first connecting portion is the same with converging piece, first connecting portion and converging piece welding, the material of second connecting portion is the same with sampling conductor of sampling circuit board, second connecting portion and sampling conductor welding, and first connecting portion and second connecting portion electrically conductive connection.

The busbar is the aluminium bar, under the condition that sampling conductor of sampling circuit board is the copper line, conductive connection piece can be copper aluminium combined material, copper end and the copper line welding of sampling circuit board of copper aluminium combined material, copper aluminium combined material's aluminium end and aluminium bar welding. Because the connection material between the conductive connecting piece and the copper wire of the sampling circuit board is the same, and the connection material between the conductive connecting piece and the aluminum row is the same, the conductive connecting piece can be better welded with the aluminum row and the copper wire of the sampling circuit board, so that the connection stability and the conductive capacity between the conductive connecting piece and the aluminum row and the sampling circuit board are better, and the sampling circuit board has higher reliability on the voltage and other parameter collection of the battery. Meanwhile, compared with a nickel sheet, the copper-aluminum composite material has lower material cost, so that the cost of the battery connecting device is reduced, and the manufacturing cost of the battery is further reduced.

The battery disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the batteries. The power supply system with the battery and the like disclosed by the application can be used for forming the power utilization device, so that the cost of the power utilization device is reduced, and the reliability of the power utilization device for acquiring relevant parameters of the battery is improved.

The embodiment of the application provides an electricity utilization device using a battery as a power supply, wherein the electricity utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 schematically illustrates a schematic structural diagram of a vehicle according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2, fig. 2 schematically illustrates an exploded view of a battery provided in some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end opened, the first portion 11 may be a plate-shaped structure, and the first portion 11 covers the opening side of the second portion 12, so that the first portion 11 and the second portion 12 together define a containing space; the first portion 11 and the second portion 12 may be hollow structures each having an opening at one side, and the opening side of the first portion 11 is engaged with the opening side of the second portion 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Referring to fig. 3, fig. 3 schematically illustrates an exploded structure of a battery cell according to some embodiments of the present application. The battery cell 20 refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 20 includes an end cap 21, a housing 22, a cell assembly 23, and other functional components.

The end cap 21 refers to a member that is covered at the opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cover 21 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the end cover 21 is not easy to deform when being extruded and collided, so that the battery cell 20 can have higher structural strength, and the safety performance can be improved. The end cap 21 may be provided with a functional part such as an electrode terminal 211. The electrode terminals 211 may be used to electrically connect with the cell assembly 23 for outputting or inputting electric power of the battery cell 20. The material of the end cap 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, insulation may also be provided on the inside of the end cap 21, which may be used to isolate electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. By way of example, the insulation may be plastic, rubber, or the like.

The housing 22 is an assembly for mating with the end cap 21 to form the internal environment of the battery cell 20, where the internal environment may be formed to house the cell assembly 23, electrolyte, and other components. The case 22 and the end cap 21 may be separate members, and an opening may be provided in the case 22, and the interior of the battery cell 20 may be formed by covering the opening with the end cap 21 at the opening. It is also possible to integrate the end cap 21 and the housing 22, but specifically, the end cap 21 and the housing 22 may form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 22, the end cap 21 is then put into place with the housing 22. The housing 22 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 may be determined according to the specific shape and size of the cell assembly 23. The material of the housing 22 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiments of the present application.

The cell assembly 23 is a component in which electrochemical reactions occur in the battery cells 20. One or more battery cell assemblies 23 may be contained within the housing 22. The cell assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet having active material constitute the main body portion of the cell assembly, and the portions of the positive electrode sheet and the negative electrode sheet having no active material constitute the tab 231, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 231 is connected to the electrode terminal to form a current loop.

Referring to fig. 4 and 5, fig. 4 schematically illustrates an internal structure of a battery according to some embodiments of the present application, fig. 5 schematically illustrates an enlarged view of a portion a of fig. 4, and the battery 100 further includes a battery connection device for electrically connecting the plurality of battery cells 20 while controlling charge and discharge of the battery 100. The battery connection device generally includes a sampling circuit board 500, a conductive connection member 600, and a bus bar 400.

The bus bar 400 may be connected with the electrode terminals 211 of the battery cells 20 for achieving electrical connection between the plurality of battery cells 20, and in particular, the bus bar 400 may connect the plurality of battery cells 20 in parallel or in parallel. The bus bar 400 is a conductor having conductive properties, and may be an aluminum bar, a copper bar, or the like.

Sampling circuit board 500 accessible insulation board installs the one end at a plurality of battery monomers 20, sampling circuit board 500 can gather the voltage of battery monomers 20, be provided with sampling conductor 510 on the sampling circuit board 500, sampling conductor 510 is the part of the circuit on the sampling circuit board 500, specifically can be the metalwork that has electric conduction ability, specifically can be copper line or copper sheet etc., sampling circuit board 500 is connected with conductive connection piece 600 corresponding to every battery monomer 20, conductive connection piece 600 can be the metalwork that has electric conduction ability, sampling circuit board 500 is connected with the collector 400 that battery monomers 20 are connected through conductive connection piece 600, in order to gather the voltage of battery monomers 20. The voltages collected by the sampling circuit board 500 are transmitted in a signal manner in the corresponding sampling circuit, and the sampling circuit board 500 can transmit the collected signals to the battery 100 management system. The battery 100 management system BMS (Battery Management System), which can intelligently manage and maintain each battery cell 20, reduce the possibility of overcharge and overdischarge of the battery 100, prolong the service life of the battery 100, monitor the state of the battery 100, and the like.

The sampling circuit board 500 may be a flexible circuit board, which is a flexible printed circuit board made of polyimide or polyester film as a base material and having high reliability, and is excellent. The flexible circuit board has high packing density, small volume and light weight, and because of high-density assembly and reduced connecting lines between parts (including parts), the reliability is increased, the wiring layer can be increased, and then the elastic design is increased.

The sampling circuit board 500 may also integrate a temperature acquisition unit (e.g., a temperature sensor) to acquire a temperature signal of the battery cell 20.

According to some embodiments of the present application, referring to fig. 6 and 7, fig. 6 schematically illustrates a schematic diagram of a battery connection device according to some embodiments of the present application, and fig. 7 schematically illustrates a schematic diagram of a conductive connector according to some embodiments of the present application, and the present embodiment proposes a battery connection device including a bus bar 400, a sampling circuit board 500, and a conductive connector 600. The bus bar 400 is used for connecting with the electrode terminals 211 of the battery 100, the sampling circuit board 500 is provided with the sampling conductors 510, the conductive connecting piece 600 comprises a first connecting portion 610 and a second connecting portion 620 which are formed in a composite mode, the first connecting portion 610 and the second connecting portion 620 are connected in a conductive mode, the material of the first connecting portion 610 is identical to that of the bus bar 400, the first connecting portion 610 is welded with the bus bar 400, the material of the second connecting portion 620 is identical to that of the sampling conductors 510, and the second connecting portion 620 is welded with the sampling conductors 510.

The bus bar 400 may be connected to the electrode terminal 211 of the battery cell 20 at one side and to the conductive connector 600 at the other side when assembled into the battery 100. The bus bar 400 has conductivity, and is typically a metal member, for example, an aluminum bar formed by processing an aluminum material. The sampling conductor 510 of the sampling circuit board 500 has conductivity, and is typically a metal member, for example, a copper wire processed from a copper material.

The conductive connection member 600 has conductivity, and in the case where the bus member 400 and the sampling conductor 510 are both metal, the conductive connection member 600 may be a metal composite material, in which a partial region is the first connection portion 610 and another partial region is the second connection portion 620. For example, in the case where the bus bar 400 is an aluminum row and the sampling conductor 510 is a copper wire, the conductive connector 600 is a copper-aluminum composite material, which may have one end of a copper portion and the other end of an aluminum portion, the copper portion being welded to the sampling conductor 510, and the aluminum portion being welded to the aluminum row.

The first connection portion 610 and the second connection portion 620 may be integrally formed by compounding, the first connection portion 610 and the second connection portion 620 have conductive properties, and after the first connection portion 610 and the second connection portion 620 are compounded, good electrical conductivity is provided therebetween. In some embodiments, the conductive connector 600 is a metal composite material, and the first connection portion 610 and the second connection portion 620 may be formed integrally by continuous casting and rolling of different metal material sheets at high temperature. In other embodiments, the first connection portion 610 and the second connection portion 620 of the conductive connection member 600 may be integrally formed by injection molding.

The first connection portion 610 and the bus bar 400 may be welded by adding solder (the solder may be the same as the material of the first connection portion 610 and the bus bar 400), or may be welded by non-added solder (i.e., by welding the first connection portion 610 and the bus bar 400), and may be specifically connected by a laser welding process. The second connection portion 620 and the sampling conductor 510 may be welded by adding solder (the solder may be the same material as the second connection portion 620 and the sampling conductor 510), or may be welded by not adding solder (i.e., by fusion welding of the second connection portion 620 and the sampling conductor 510), or may be welded by reflow, ultrasonic, laser, friction welding, or other process methods.

Reflow soldering, ultrasonic soldering, laser soldering, friction soldering belong to the thermal soldering process. Reflow soldering is a soldering process in which air or nitrogen is heated to a sufficiently high temperature and then blown toward the pieces to be soldered to melt the soldering positions of the pieces to be soldered or the solder to be melted, thereby realizing soldering. Ultrasonic welding is a welding process in which ultrasonic waves are directed to the surface of a welding location of a workpiece to be welded, and the workpiece to be welded is excited by the ultrasonic waves to vibrate rapidly and thereby produce mechanical work, which, as it is converted back to heat, melts the welding location of the workpiece to be welded, thereby achieving welding. Laser welding is a method of welding with heat generated by the bombardment of a weldment with a focused laser beam as an energy source. Friction welding is a method of welding by using heat generated by friction of contact surfaces of workpieces to be welded as a heat source to generate plastic deformation of the workpieces to be welded under the action of pressure.

It should be noted that the shapes of the welding positions formed by different welding processes may be different, and the shape of a specific welding position may be determined according to the welding process and the welding position. Fig. 6 is a schematic diagram of a battery connection device formed by using laser welding between the first connection portion 610 and the bus bar 400 and friction welding between the second connection portion 620 and the sampling conductor 510.

In the battery connection device of the present embodiment, parameters such as voltage of the battery 100 can be collected through the sampling circuit board 500 so as to manage the battery 100, specifically, the conductive connection member 600 is welded with the bus member 400 and the sampling conductor 510 through the first connection portion 610 and the second connection portion 620, respectively, so as to realize electrical connection between the sampling circuit board 500 and the bus member 400, and since the bus member 400 is assembled into the battery 100, the bus member 400 can be connected with the electrode terminal 211 of the battery 100, and thus, the sampling circuit board 500 can collect parameters such as voltage of the battery 100 through the bus member 400.

The first connecting portion 610 is made of the same material as the bus piece 400, so that the conductive connecting piece 600 and the bus piece 400 can be easily welded, the stability of connection between the first connecting portion 620 and the bus piece 400 and the conductivity between the second connecting portion 620 and the sampling conductor 510 of the sampling circuit board 500 are improved, the stability of connection between the second connecting portion 620 and the sampling conductor 510 and the conductivity between the second connecting portion 620 are improved due to the fact that the materials are the same, and the first connecting portion 610 and the second connecting portion 620 are formed in a combined mode and are electrically connected with each other, and therefore the sampling circuit board 500 has high stability in collecting parameters such as voltage.

Compared with a conductor (such as a noble metal, for example, a nickel sheet) of the same material suitable for welding connection with the bus bar 400 and the sampling conductor 510, the conductive connector 600 of the present embodiment adopts the first connection portion 610 and the second connection portion 620 formed by compounding, and the welding between the conductive connector 600 and the bus bar 400 and the sampling conductor 510 is not affected by the difference of the materials, so that the connection stability is improved, the stability of the sampling circuit board 500 to parameter collection is better, the cost is lower, and the cost of the battery connector is reduced, thereby reducing the manufacturing cost of the battery 100.

With continued reference to fig. 6 and 7, according to some embodiments of the present application, optionally, the first connection portion 610 includes a first connection surface 611 and a first composite surface 612, the second connection portion 620 includes a second connection surface 622 and a second composite surface 621, the first composite surface 612 is bonded to the second composite surface 621, the first connection surface 611 is bonded to the bus bar 400, and the second connection surface 622 is bonded to the sampling conductor 510.

The first connection surface 611 and the first composite surface 612 are part of the surface of the first connection portion 610, and the first connection surface 611 and the first composite surface 612 are surfaces of different positions of the first connection portion 610. The second connection surface 622 and the second composite surface 621 are part of the surface of the second connection portion 620, and the second connection surface 622 and the second composite surface 621 are surfaces of different positions of the second connection portion 620.

The first composite surface 612 and the second composite surface 621 may be bonded and compounded by high-temperature continuous casting and rolling. The first compound surface 612 and the second compound surface 621 are bonded and compounded, so that the surface surfaces between the first connecting portion 610 and the second connecting portion 620 are connected, the connection area between the first connecting portion 610 and the second connecting portion 620 is increased, and good conductivity and connection stability are achieved between the first connecting portion 610 and the second connecting portion 620.

The first connection surface 611 and the bus member 400 may be bonded by laser welding or the like. The first connection surface 611 is bonded and welded with the bus member 400, so that the surface between the first connection surface 611 and the bus member 400 is connected, the connection area between the first connection surface 611 and the bus member 400 is increased, and the conductive connection member 600 and the bus member 400 have better conductivity and connection stability.

The second connection surface 622 and the sampling conductor 510 of the sampling circuit board 500 may be bonded by laser welding or the like. The second connection surface 622 is bonded to the sampling conductor 510, so that the second connection surface 622 is connected to the surface of the sampling conductor 510, the connection area between the second connection surface 622 and the sampling conductor 510 is increased, and the conductive connection piece 600 and the sampling circuit board 500 have good conductivity and connection stability.

In this embodiment, the first composite surface 612 and the second composite surface 621 are bonded and compounded, the first connecting surface 611 is bonded and welded with the bus member 400, and the second connecting surface 622 is bonded and welded with the sampling conductor 510, so that the overall battery connecting device has better connection stability, and the reliability of sampling of the battery connecting device is improved.

It should be noted that, the welding area between the first connection surface 611 and the bus bar 400, the welding area between the first composite surface 612 and the second composite surface 621, and the welding area between the second connection surface 622 and the sampling conductor 510 may be adaptively designed according to the overcurrent capability of the battery connection device.

With continued reference to fig. 6 and 7, according to some embodiments of the present application, optionally, the first connection portion 610 extends from the busbar 400 toward the sampling conductor 510, and the first connection portion 610 has a first end 613 and a second end 614 opposite to each other, the first end 613 being located on a side of the busbar 400, the second end 614 being located on a side of the sampling circuit board 500 where the sampling conductor 510 is located, the first connection face 611 being located on a side of the first end 613 facing the busbar 400, and the first composite face 612 being located on a side of the second end 614 facing the sampling conductor 510.

The first end 613 of the first connecting portion 610 may include an end portion of the first end 613 and a portion near the end portion of the first end 613, and accordingly, the first connecting surface 611 may be an end surface of the first end 613 or a local position of the end surface, or a side surface of the first end 613 or a local position of the side surface. The second end 614 of the first connecting portion 610 may include an end portion of the second end 614 and a portion near the end portion of the second end 614, and accordingly, the first composite surface 612 may be an end surface of the second end 614 or a partial position of the end surface, or may be a side surface of the second end 614 or a partial position of the side surface. Referring to fig. 6 and 7, in one specific implementation, the first connection surface 611 and the first composite surface 612 are formed on the side surface of the first connection portion 610, and the first connection surface 611 and the first composite surface 612 are sequentially arranged in the direction from the first end 613 to the second end 614.

The first connection portion 610 of the present embodiment extends from the bus bar 400 to the sampling conductor 510, the first end 613 of the first connection portion 610, which is close to the first connection portion 610, can be connected to the bus bar 400, the second end 614 of the first connection portion 610, which is corresponding to the sampling circuit board 500, can be combined with the second connection portion 620, the structure is simple, and the assembly of the conductive connection member 600, the bus bar 400 and the sampling circuit board 500 is convenient.

It should be noted that, in some embodiments, the second connection portion 620 may also be disposed to extend from the sampling conductor 510 toward the bus bar 400, and an end of the second connection portion 620 away from the sampling conductor 510 may be disposed on one side of the bus bar 400, so as to facilitate assembly of the conductive connection member 600 with the bus bar 400 and the sampling circuit board 500.

With continued reference to fig. 6 and 7, according to some embodiments of the present application, optionally, the second connection portion 620 is disposed on a side of the sampling circuit board 500 where the sampling conductor 510 is disposed, the second connection surface 622 and the second composite surface 621 are opposite sides of the second connection portion 620, the second composite surface 621 is disposed toward the first composite surface 612, and the second connection surface 622 is disposed toward the sampling conductor 510.

The present embodiment may be configured on the basis of the arrangement in which the first connection portion 610 extends from the bus bar 400 toward the sampling conductor 510. The first connection part 610 extends to a side of the sampling circuit board 500 where the sampling conductors 510 are disposed, and the second connection part 620 is combined with the first combining surface 612 through the second combining surface 621 to be formed on the first connection part 610. The first connection surface 611, the first complex surface 612, the second connection surface 622, and the second complex surface 621 have various arrangements according to the arrangement positions of the sampling circuit board 500 and the bus bar 400. For example, one end of the conductive connection member 600 forms a first connection portion 610, the other end forms a second connection portion 620, the conductive connection member 600 is disposed in a region between the sampling circuit board 500 and the bus bar 400, an end surface of the first end 613 of the first connection portion 610 forms a first connection surface 611, an end surface of the second end 614 of the first connection portion 610 forms a first complex surface 612, and both end surfaces of the second connection portion 620 form a second complex surface 621 and a second connection surface 622, respectively. As another example, as shown in fig. 6, the first composite surface 612 is formed on a side surface of the second end 614 of the first connection portion 610, the first composite surface 612 of the first connection portion 610 is located above the sampling conductor 510 and is spaced from the sampling conductor 510, the second connection portion 620 is disposed between the sampling conductor 510 and the first composite surface 612, the second composite surface 621 is formed on the upper surface of the second connection portion 620, and the second composite surface 621 faces the first composite surface 612 and is composited with the first connection portion 610 through the first composite surface 612, and the second connection surface 622 of the second connection portion 620 faces downward and is welded to the sampling conductor 510.

The second connection portion 620 of this embodiment has a simple structure, and the second connection surface 622 faces away from the first composite surface 612 and toward the sampling conductor 510, so that the second connection portion 620 is convenient to be welded to the sampling conductor 510. Meanwhile, the set positions of the bus bar 400 and the sampling circuit board 500 are generally predetermined at the time of assembly of the battery 100, so that the conductive connection member 600 generally needs to be adaptively processed according to the set positions of the bus bar 400 and the sampling circuit board 500. In this embodiment, the second composite surface 621 faces the first composite surface 612, and the second connection surface 622 and the second composite surface 621 face opposite to each other, so that the second connection surface 622 and the first composite surface 612 face the same direction, and thus, according to the required arrangement positions of the bus bar 400 and the sampling conductor 510, the required first connection surface 611 and the second connection surface 622 can be conveniently pushed out, and the arrangement positions of the first composite surface 612 and the second composite surface 621 can be conveniently pushed out, which is beneficial to the composite formation of the conductive connection member 600 according to the required arrangement of the bus bar 400 and the sampling conductor 510, and facilitates the design and processing of the conductive connection member 600.

As shown in fig. 6 and 7, optionally, the buss bar 400 and the sampling circuit board 500 are located on the same side of the conductive connection 600 according to some embodiments of the present application.

Specifically, the sampling circuit board 500 and the bus bar 400 may be both located at a side of the conductive connection member 600 facing the battery cell 20. Referring to fig. 4, 5 and 6, the sampling circuit board 500 and the bus bar 400 are disposed at one end, specifically, the upper end, of the battery cell 20, the first connection part 610 of the conductive connection member 600 is welded to the upper surface of the bus bar 400, and the second connection part 620 is welded to the upper surface of the sampling conductor 510.

In this embodiment, the bus bar 400 and the sampling circuit board 500 are located on the same side of the conductive connector 600, and when the bus bar 400 and the sampling circuit board 500 are disposed on the battery cell 20, the conductive connector 600 may be located on the side of the bus bar 400 and the sampling circuit board 500 away from the battery cell 20, so that the installation influence of the conductive connector 600 on the bus bar 400 and the sampling circuit board 500 is reduced, and the tight arrangement of the components is facilitated.

As shown in fig. 6 and 7, according to some embodiments of the present application, optionally, the first connection portion 610 has a first side 615 and a second side 616 that are disposed opposite to each other, the bus bar 400 and the sampling circuit board 500 are both located on a side of the first side 615 facing away from the second side 616, the first connection surface 611 and the first composite surface 612 are both located on the first side 615, the first connection surface 611 is spaced from the first composite surface 612 along a direction X perpendicular to the first side 615, and the first connection surface 611 is located on a side of the first composite surface 612 facing away from the second side 616; the second connecting surface is flush with the first connecting surface.

Wherein the first connection face 611 and the first compound face 612 are partial areas of the first side face 615.

As shown in fig. 4, 5, 6 and 7, the bus bar 400 and the sampling circuit board 500 may be located on the same side of the conductive connection member 600, and the first connection surface 611 protrudes toward the side of the bus bar 400 relative to the first combining surface 612, so that when the second connection portion 620 is combined with the first connection portion 610, the second connection surface 622 may be disposed flush with the first connection surface 611.

Specifically, the present embodiment is described taking the case where the bus bar 400 and the sampling circuit board 500 are located at the lower side of the conductive connector 600. The conductive connector 600 of this embodiment may be a generally rectangular sheet-like structure. The upper surface of the first connecting portion 610 is a second side 616, and the lower surface of the first connecting portion 610 is a first side 615. Wherein the thickness of the first end 613 and the second end 614 of the first connection portion 610 is different, the thickness of the first end 613 is greater than the thickness of the second end 614, and the first end 613 and the second end 614 are disposed flush on a side facing away from the bus bar 400, that is, the second side 616, such that the first end 613 and the second end 614 face a side of the bus bar 400, that is, the first side 615 forms a step surface. The first end 613 faces the first connection surface 611 formed on the side of the bus member 400, the second end 614 faces the side of the bus member 400 (the side facing the sampling conductive side, i.e., the second end 614 is located on the same side as the bus member 400 is located on the conductive connection member 600) to form a first composite surface 612, and the first connection surface 611 is located closer to the battery cell 20 than the first composite surface 612. The second connection portion is combined with the first combining surface 612, and the thickness of the second connection portion 620 is set to be the same as the thickness difference between the first end 613 and the second end 614, so that the second connection surface 622 can be flush with the first connection surface 611.

The first connection surface 611 and the second connection surface 622 of the conductive connector 600 are flush, so that the conductive connector 600 can be stably supported by the first connection surface 611 and the second connection surface 622 during the process of welding the conductive connector 600 with the bus bar 400 and the sampling circuit board 500, and the conductive connector 600 has high connection stability after welding.

Optionally, according to some embodiments of the present application, the busbar 400 includes an aluminum row, and the first connection portion 610 includes an aluminum portion, and the aluminum row is welded to the aluminum portion. And/or the sampling conductor 510 is a copper wire, the second connection portion 620 is a copper portion, and the copper wire is soldered to the copper portion. And/or the sampling circuit board 500 includes a flexible circuit board.

In one embodiment, the bus bar 400 may be an aluminum bar, and the first connection portion 610 may be an aluminum portion welded with a copper material of the aluminum bar. The aluminum row has better electric conductivity and lower material cost.

In one particular embodiment, the sampling conductor 510 may be a copper wire and the second connection 620 may be a copper portion that is soldered to the copper wire. The copper wire has better conductivity, is suitable for weak point circuits, and has lower material cost.

In one embodiment, the sampling circuit board 500 includes a flexible circuit board, which can be better attached to one end of the battery cell 20, and has high assembly density, small volume and light weight, which is beneficial to reducing the weight of the battery 100.

According to some embodiments of the present application, optionally, as shown in fig. 6 and 7, the first connection portion 610 is connected to the bus bar 400 by a first welding portion 630, and the material of the first welding portion 630, the material of the first connection portion 610, and the material of the bus bar 400 are the same.

The first welding part 630 may be a structure formed by melting and solidifying the first connection surface 611 of the first connection part 610 and the position where the bus bar 400 is connected to the first connection part 610 during welding, in other words, the first welding part 630 is a structure formed by welding the first connection part 610 and the bus bar 400 to each other. The first welding part 630 may be formed by welding with the same material as the first connection part 610 and the bus bar 400.

The material of the first welding part 630, the material of the first connection part 610 and the material of the bus bar 400 are the same, so that the welding between the first connection part 610 and the bus bar 400 is easy, the welding stability of the first connection part 610 and the bus bar 400 is improved, and the sampling stability of the battery connection device is improved.

Optionally, as shown in fig. 6 and 7, the second connection part 620 is connected to the sampling conductor 510 through a second welding part 640, and the material of the second welding part 640, the material of the second connection part 620, and the material of the sampling conductor 510 are the same according to some embodiments of the present application.

The second welding part 640 may be a structure formed by melting and solidifying the second connection surface 622 of the second connection part 620 and the position where the sampling conductor 510 is connected to the second connection part 620 during welding, in other words, the second welding part 640 is a structure formed by welding the second connection part 620 and the sampling conductor 510 to each other. The second welding part 640 may be formed by welding with the same material as that of the second connection part 620 and that of the sampling conductor 510.

The material of the second fusion welding part 640, the material of the second connection part 620 and the material of the sampling conductor 510 of the sampling circuit board 500 are the same, so that the welding between the second connection part 620 and the sampling conductor 510 of the sampling circuit board 500 is easy, the welding stability of the second connection part 620 and the sampling circuit board 500 is improved, and the sampling stability of the battery connection device is further improved.

Referring to fig. 8 and 9, fig. 8 schematically illustrates a cross-sectional view of a conductive connector according to some embodiments of the present application, and fig. 9 schematically illustrates a cross-sectional view of a conductive connector according to some embodiments of the present application, optionally with a male-female mating structure 650 between the first and second mating surfaces 612, 621 according to some embodiments of the present application.

The male and female mating structures 650 may be groove and male mating structures. Specifically, one of the first composite surface 612 and the second composite surface 621 may be provided with a groove, and the other one is provided with a protrusion, the protrusion is adapted to the groove and the protrusion is disposed in the groove; it is also possible that the first composite surface 612 is provided with a groove and a protrusion, the second composite surface 621 is also provided with a groove and a protrusion, and the groove of the first composite surface 612 is adapted to be spliced and compounded with the protrusion of the second composite surface 621, and the groove of the second composite surface 621 is adapted to be spliced and compounded with the protrusion of the first composite surface 612.

The shape of the protrusions may be set according to needs, for example, as shown in fig. 8, the structures of the protrusions may be trapezoidal protrusions; as another example, as shown in fig. 9, the bump structure may be a wave bump.

The concave-convex fitting structure 650 can improve the stability of the combination of the first and second combining surfaces 612 and 621, and can increase the contact area between the first and second combining surfaces 612 and 621, and improve the overcurrent capacity of the first and second connection portions 610 and 620.

Some embodiments of the present application further provide a battery 100 including a battery cell 20 and a battery connection device provided in the present application or any embodiment of the present application, the battery cell 20 has an electrode terminal 211, and a sampling conductor 510 of a sampling circuit board 500 of the battery connection device is connected to the electrode terminal 211.

Some embodiments of the present application further provide an electrical device, including the battery 100 according to any one of the above aspects, and the battery 100 is configured to provide electrical energy to the electrical device.

The powered device may be any of the devices or systems described above that employ battery 100.

According to some embodiments of the present application, as shown in fig. 4 to 7, the present embodiment provides a battery connection device, which includes a bus bar 400, a sampling circuit board 500, and a conductive connection member 600, wherein the bus bar 400 is an aluminum bar, and copper wires are disposed on the sampling circuit board 500 as sampling conductors 510. The conductive connection member 600 is a copper-aluminum composite sheet, and the conductive connection includes a first connection portion 610 and a second connection portion 620, and the first connection portion 610 is an aluminum portion. The first connection portion 610 extends from the bus bar 400 to the sampling conductor 510, the first connection portion 610 includes a first connection surface 611 and a first composite surface 612, the second connection portion 620 includes a second connection surface 622 and a second composite surface 621, the first composite surface 612 is bonded to the second composite surface 621, the first connection surface 611 is bonded to the bus bar 400 and is welded by means of laser welding, and the second connection surface 622 is bonded to the sampling conductor 510 and is welded by means of laser welding, reflow welding or friction welding. The first connection portion 610 is welded to the aluminum bar by laser welding, the second connection portion 620 is a copper portion, and the second connection portion 620 is welded to the copper wire by friction welding. The aluminum portion of the first connection portion 610 is located at one side of the bus bar 400, the copper portion is located at one side of the sampling circuit board 500 where the sampling conductors 510 are located, the first connection surface 611 is located at one side of the aluminum portion facing the bus bar 400, and the first composite surface 612 is located at one side of the copper portion facing the sampling conductors 510. The second connection portion 620 is disposed on a side of the sampling circuit board 500 where the sampling conductor 510 is disposed, the second connection surface 622 and the second composite surface 621 are opposite sides of the second connection portion 620, the second composite surface 621 is disposed toward the first composite surface 612, and the second connection surface 622 is disposed toward the sampling conductor 510. The bus bar 400 and the sampling circuit board 500 are located on the same side of the conductive connection piece 600, the first connection surface 611 protrudes toward the side where the bus bar 400 is located relative to the first composite surface 612, and the second connection surface 622 is disposed flush with the first connection surface 611. The sampling circuit board 500 is a flexible circuit board.

The embodiment breaks through the bottleneck of taking the nickel sheet as the sampling sheet, relieves the difficult problem of welding different materials by means of the copper-aluminum composite material, and uses the copper-aluminum composite sheet to replace the nickel sheet, so that the cost of the battery connecting device is reduced.

The foregoing description of various embodiments is intended to highlight differences between the various embodiments, which may be the same or similar to each other by reference, and is not repeated herein for the sake of brevity.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (12)

1. A battery connection device, comprising:

a bus bar for connecting with electrode terminals of the battery;

the sampling circuit board is provided with a sampling conductor;

the conductive connecting piece comprises a first connecting part and a second connecting part which are formed in a compounding mode, wherein the first connecting part is connected with the second connecting part in a conductive mode, the material of the first connecting part is the same as that of the confluence piece, the first connecting part is welded with the confluence piece, the material of the second connecting part is the same as that of the sampling conductor, and the second connecting part is welded with the sampling conductor.

2. The battery connection device of claim 1, wherein the first connection portion comprises a first connection face and a first compound face, the second connection portion comprises a second connection face and a second compound face, the first compound face is in abutting engagement with the second compound face, the first connection face is in abutting engagement with the bus bar, and the second connection face is in abutting engagement with the sampling conductor.

3. The battery connection device of claim 2, wherein the first connection portion extends from the bus bar toward the sampling conductor, the first connection portion having opposite first and second ends, the first end being located on a side of the bus bar, the second end being located on a side of the sampling circuit board where the sampling conductor is located, the first connection face being located on a side of the first end toward the bus bar, and the first composite face being located on a side of the second end toward the sampling conductor.

4. The battery connecting device according to claim 3, wherein the second connecting portion is provided on a side of the sampling circuit board on which the sampling conductor is provided, the second connecting surface and the second composite surface are opposite surfaces of the second connecting portion, the second composite surface is provided toward the first composite surface, and the second connecting surface is provided toward the sampling conductor.

5. The battery connection device of claim 4, wherein the bus bar and the sampling circuit board are located on the same side of the conductive connection member.

6. The battery connecting device according to claim 5, wherein the first connecting portion has a first side surface and a second side surface which are oppositely arranged, the bus bar and the sampling circuit board are both located on a side of the first side surface facing away from the second side surface, the first connecting surface and the first composite surface are both located on the first side surface, the first connecting surface and the first composite surface are arranged at intervals along a direction perpendicular to the first side surface, and the first connecting surface is located on a side of the first composite surface facing away from the second side surface;

the second connecting surface is flush with the first connecting surface.

7. The battery connecting device according to any one of claims 1 to 6, wherein the bus bar includes an aluminum row, the first connecting portion includes an aluminum portion, and the aluminum row is welded to the aluminum portion;

and/or the sampling conductor comprises a copper wire, the second connection part comprises a copper part, and the copper wire is welded with the copper part;

and/or, the sampling circuit board comprises a flexible circuit board.

8. The battery connecting device according to any one of claims 1 to 6, wherein the first connecting portion and the current collecting member are connected by a first welding portion, and a material of the first welding portion, a material of the first connecting portion, and a material of the current collecting member are the same.

9. The battery connecting device according to any one of claims 1 to 6, wherein the second connecting portion and the sampling conductor are connected by a second fusion welding portion, and a material of the second fusion welding portion, a material of the second connecting portion, and a material of the sampling conductor are the same.

10. The battery connection device of any one of claims 2-6, wherein a male-female mating structure is provided between the first and second composite surfaces.

11. A battery, comprising:

A battery cell having an electrode terminal;

the battery connecting device according to any one of claims 1 to 10, wherein the bus bar of the battery connecting device is connected to the electrode terminal.

12. An electrical device comprising the battery of claim 11 for providing electrical energy.