WO2023065067A1 - 采样组件及其制造方法、电池及用电设备 - Google Patents

采样组件及其制造方法、电池及用电设备 Download PDF

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Publication number
WO2023065067A1
WO2023065067A1 PCT/CN2021/124390 CN2021124390W WO2023065067A1 WO 2023065067 A1 WO2023065067 A1 WO 2023065067A1 CN 2021124390 W CN2021124390 W CN 2021124390W WO 2023065067 A1 WO2023065067 A1 WO 2023065067A1
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WO
WIPO (PCT)
Prior art keywords
battery
sampling
conductive connecting
piece
connecting piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/124390
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English (en)
French (fr)
Inventor
秦峰
计泓冶
王志
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to PCT/CN2021/124390 priority Critical patent/WO2023065067A1/zh
Priority to EP21960828.8A priority patent/EP4258443A4/en
Priority to CN202180090426.9A priority patent/CN116762219A/zh
Publication of WO2023065067A1 publication Critical patent/WO2023065067A1/zh
Priority to US18/352,936 priority patent/US20240021897A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to the technical field of electrochemistry, and in particular to a sampling component, a manufacturing method thereof, a battery and electrical equipment.
  • a sampling component In order to monitor the working state of the battery cells in the battery, a sampling component is usually set in the battery so that the working parameters of the battery cells, such as voltage, current, temperature, etc., can be measured in real time.
  • the assembly process of the sampling components in the related art is cumbersome, resulting in low assembly efficiency.
  • the sampling components are easily deformed or damaged during assembly, which affects the yield of the final product.
  • the purpose of the embodiments of the present disclosure is to provide a sampling assembly and its manufacturing method, battery and electrical equipment, so as to improve the assembly efficiency of the sampling assembly and the product yield after assembly.
  • the embodiment of the first aspect of the present disclosure provides a sampling assembly for a battery, and the battery includes at least two battery cells arranged along a first direction, wherein the sampling assembly includes: a sampling piece for For transmitting sampling signals, the sampling piece has lead wires; a support seat, used to support between two adjacent battery cells along the first direction; a conductive connecting piece, the conductive connecting piece is arranged on the On the support seat, the lead wire is connected to the conductive connecting piece; and a bonding piece, one end of the bonding piece is used to connect the conductive connecting piece, and the other end of the bonding piece is used to connect the conductive connecting piece.
  • the battery cell is used to collect the sampling signal of the battery cell.
  • the sampling piece is connected to the conductive connection piece through the lead wire, and the conductive connection piece is connected to the battery cell in the battery through the bonding piece, thereby realizing the electrical connection between the sampling piece and the battery cell , so that the working parameters of the battery cells are collected through the sampling part, and the sampling part further transmits the sampling signal representing the working parameters of the battery cells to an external monitoring device.
  • the embodiment of the present disclosure uses the bonding piece to connect the conductive connecting piece and the battery cell.
  • the sampling assembly in the embodiments of the present disclosure is beneficial to improve assembly efficiency and product yield.
  • the support seat includes a positioning part and a supporting part, the positioning part is adapted to the shape of the battery cell, and the supporting part is located along the first direction Between two adjacent positioning parts.
  • the support seat can be positioned relatively stably between two adjacent battery cells along the first direction.
  • the shape of the battery cell includes a side surface of the battery cell and an end surface of the battery cell.
  • the support seat can be stably supported between two adjacent battery cells along the first direction and at the end of the battery cells, which is beneficial to reduce the length of the bonding member, and furthermore It is beneficial to reduce the working stroke of the laser welding equipment when implementing laser welding, so as to improve the assembly efficiency between the sampling component and the battery.
  • the conductive connecting sheet is a sheet-like structure in which each part is disposed on the supporting part.
  • the laser welding equipment can be used to weld the bonding piece to the conductive connecting piece, and to weld the bonding piece to the pole of the battery cell.
  • the conductive connecting piece includes a first section, a second section and a third section connected in sequence, and the first section and the third section are not coplanar , so that the conductive connecting piece forms a ladder structure, the lead is connected to the first section, and one end of the bonding piece is connected to the third section.
  • the length of the bonding piece can be further reduced, thereby further reducing the working stroke of the laser welding equipment when performing laser welding, thereby further improving the assembly efficiency of the sampling assembly and the battery assembly.
  • the support seat further includes a spacer, the spacer is disposed on a side of the support portion away from the battery cells, and the spacer is used to space the battery cells along the second direction. Permutations of adjacent sampled components. When the sampling assembly is assembled on the battery, the spacer can abut against the supporting seat of the adjacent sampling assembly, thereby enhancing the positioning stability of the supporting seat and preventing the supporting seat from moving in the second direction.
  • the third section is fixedly disposed on the spacer. Since the spacer is arranged on the side of the support part away from the battery cell, the spacer is in a position substantially parallel to the pole of the battery cell, and the third section of the conductive connecting piece is fixed on the spacer. It can meet the position setting requirements of the third section, and in addition, it is beneficial to improve the structural strength and structural rigidity of the conductive connecting piece, and prevent the conductive connecting piece from being deformed when it is subjected to an external force.
  • the battery cells are provided with poles protruding from the end faces of the battery cells; In the case of battery cells, the heights of both ends of the bonding member are substantially the same. In this way, the laser welding equipment can sequentially carry out the operations of welding the bonding part with the third segment and welding the bonding part with the pole without adjusting the downward force, so as to further improve assembly efficiency.
  • a covering portion for covering at least part of the lead wires is disposed on the conductive connecting piece.
  • the sampling assembly further includes a metal gasket, and the metal gasket is disposed between the conductive connecting piece and the support seat. Even if the conductive connecting piece is welded through, the bonding member can still be electrically connected to the conductive connecting piece through the metal gasket, thereby avoiding the occurrence of poor welding problems.
  • the support seat is made of insulating material. In this way, the bonding piece, the conductive connecting piece and the battery cell can be isolated through the support seat, so as to ensure the insulation performance.
  • the support portion is a hollow trapezoidal block, and reinforcing ribs are provided in the cavity of the trapezoidal block.
  • the support portion of the support seat is a hollow trapezoidal block, and the top surface of the trapezoidal block is a flat plane, which can bear the pressure during welding during the laser welding process.
  • the inside of the support seat is hollow, so that the support seat as a whole has a structure of equal wall thickness, which is beneficial to the implementation of the injection molding process.
  • the embodiment of the second aspect of the present disclosure provides a battery, including the sampling assembly in any embodiment of the first aspect above, and the battery further includes at least two battery cells arranged along the first direction, the support The seat is supported between two adjacent battery cells along the first direction, and the other end of the bonding member is used to connect the battery cells.
  • the embodiment of the third aspect of the present disclosure provides an electric device, which is characterized in that it includes the battery in any embodiment of the second aspect above.
  • the embodiment of the fourth aspect of the present disclosure provides a method for manufacturing a sampling assembly, the battery includes at least two battery cells arranged along a first direction, including: providing a sampling part for transmitting a sampling signal, the sampling The component has lead wires; a support base is provided for supporting between two adjacent battery cells along the first direction; a conductive connecting piece is provided, and the conductive connecting piece is arranged on the supporting base, so The lead wire is connected to the conductive connecting piece; and a bonding piece is provided, one end of the bonding piece is used for connecting the conductive connecting piece, and the other end of the bonding piece is used for connecting the battery cell, for collecting the sampling signals of the battery cells.
  • FIG. 1 is a schematic structural view of a vehicle using a battery according to an embodiment of the present application
  • Fig. 2 is a schematic diagram of a battery in an embodiment
  • FIG. 3 is a schematic structural view of a battery in an embodiment of the present application.
  • Fig. 4 is a schematic structural diagram of a sampling assembly in an embodiment of the present application.
  • Fig. 5 is an exploded schematic diagram of a sampling assembly in an embodiment of the present application.
  • Fig. 6 is a schematic structural diagram of a battery in another viewing angle in an embodiment of the present application.
  • FIG. 7 is a schematic diagram of an enlarged structure of part A in FIG. 4;
  • Fig. 8 is a schematic structural diagram of a battery in another embodiment of the present application.
  • Fig. 9 is a schematic diagram of an enlarged structure of part B in Fig. 6;
  • Fig. 10 is a schematic structural view of another viewing angle of a battery in another embodiment of the present application.
  • Fig. 11 is a schematic structural diagram of a sampling assembly in another embodiment of the present application.
  • Fig. 12 is an exploded schematic diagram of a sampling assembly in another embodiment of the present application.
  • Fig. 13 is a schematic structural diagram of a conductive connecting piece of a sampling assembly in another embodiment of the present application.
  • first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be referred to as These terms are limited. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
  • spatial relative terms may be used herein to describe the relationship of one element or feature as shown in the figures with respect to another element or feature, such as “inner”, “outer”, “inner”. “, “Outside”, “Below”, “Below”, “Above”, “Above”, etc.
  • Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” or “beneath” the other elements or features. feature above”. Thus, the example term “below” can encompass both an orientation of above and below.
  • the device may be otherwise oriented, eg, rotated 90 degrees or at other orientations, and the spatially relative descriptors used herein interpreted accordingly.
  • FIG. 1 it is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application.
  • the vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle. cars etc.
  • a motor 40 , a controller 30 and a battery 10 may be provided inside the vehicle 1 , and the controller 30 is used to control the battery 10 to supply power to the motor 40 .
  • the battery 10 may be provided at the bottom or front or rear of the vehicle 1 .
  • the battery 10 can be used for power supply of the vehicle 1 , for example, the battery 10 can be used as an operating power source of the vehicle 1 , for a circuit system of the vehicle 1 , for example, for starting, navigating and running power requirements of the vehicle 1 .
  • the battery 10 can not only be used as an operating power source for the vehicle 1 , but can also be used as a driving power source for the vehicle 1 , replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle 1 .
  • the battery 10 mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 200 to provide higher voltage and capacity.
  • the battery 10 mentioned in this application may include a battery module or a battery pack.
  • the battery 10 generally includes a case 300 for enclosing one or more battery cells 200 .
  • the box 300 can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the box body 300 may include an upper cover 301 and a box shell 302, and the upper cover 301 and the box shell 302 are fastened together.
  • the shapes of the upper cover 301 and the box case 302 may be determined according to the combined shape of a plurality of battery cells 300 .
  • a plurality of battery cells 200 can be connected in series and/or in parallel via poles for various applications.
  • the application of batteries includes three levels: battery cells, battery modules and battery packs.
  • a battery module is formed by electrically connecting a certain number of battery cells together and putting them into a frame in order to protect the battery cells from external shock, heat, vibration, etc.
  • the battery pack is the final state of the battery system that goes into an electric vehicle.
  • a battery pack generally includes a case for enclosing one or more battery cells.
  • the box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the box body is generally composed of a cover body and a box shell.
  • BMS battery management system
  • thermal management components on one or more battery modules.
  • BMS battery management system
  • the level of the battery module can be omitted, that is, the battery pack is formed directly from the battery cells. This improvement has improved the gravimetric energy density and volumetric energy density of the battery system while significantly reducing the number of components.
  • the batteries mentioned in this application include battery modules or battery packs.
  • the battery cell 300 may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium ion battery, a sodium-ion battery, or a magnesium-ion battery, which is not limited in this embodiment of the application.
  • the battery cell can be in the shape of a cylinder, a flat body, a cuboid or other shapes, which is not limited in the embodiment of the present application.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.
  • batteries such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships and spacecraft, etc.
  • spacecraft include Airplanes, rockets, space shuttles and spaceships, etc.
  • each battery cell cannot be exactly the same. Due to the small differences in certain parameters between battery cells (such as voltage, internal resistance, SOC (state of charge), etc.), as the usage time increases, the difference between battery cells will become larger and larger. Due to the existence of these differences, the consistency of the battery cells becomes poor, which affects the overall performance of the battery, such as the control of charge and discharge, the control of power balance, etc., and may even cause serious fires and explosions due to failure to take reasonable controls. ACCIDENT. Therefore, a sampling component for battery cells will be installed in the battery, and corresponding control and processing can be made when abnormalities are found.
  • non-square shell-shaped battery cells such as cylindrical battery cells, prismatic battery cells, etc.
  • battery cells when multiple battery cells are arranged and/or stacked to form a battery, there is a gap between the adjacent surfaces of each battery cell. some extra space.
  • the present application takes a cylindrical battery as an example. Referring to FIG. 3 , the sides of the cylindrical battery cells arranged along the first direction are adjacent to each other, and there is a large redundant space between adjacent sides. The inventors found that this part of the space can be used to arrange the sampling components of the battery, so as to accommodate the components of the sampling component in this part of the space as much as possible, and avoid protruding from the battery cells to increase the overall volume of the battery.
  • the components are electrically connected to the poles of the battery cells to collect signals for some parameters of the battery cells. And the collected signal is transmitted to the battery management system through the flexible flat cable (FFC), so as to adjust and control the parameters of each battery cell.
  • FFC flexible flat cable
  • a sampling ring structure is generally used to electrically connect with the poles to collect electrical signals. Since reliable electrical signal acquisition requires the interference fit between the sampling ring and the pole, it is necessary to provide additional pressing force to clamp the sampling ring on the pole. Such pressing and assembling operations are difficult, inefficient, and difficult to realize automatic assembling.
  • the sampling ring is easily deformed, and parts may be damaged, which affects product yield. If these poor assembly conditions are not found in time, it will also affect the sampling and battery management of the entire battery.
  • welding is generally used to electrically connect the sampling loop and the pole.
  • the heat is high during welding, which is easy to burn the rubber of the sampling ring, and the metal particles scattered during welding will also affect the welding quality on the welding interface, or cause the problem of false welding.
  • the pole is welded, when the welding address is misplaced, it is very easy to weld through the end cover or the casing, resulting in the risk of leakage of the battery cell.
  • using the welding connection method requires the pole, sampling ring, and flexible flat cable to be assembled and welded in sequence, requiring two welding processes. The process is complicated and the operation is cumbersome, which affects mass production efficiency.
  • the inventor has studied a new sampling component based on many problems existing in the above sampling component. That is to say, the sampling assembly of the present application directly welds and bonds the pole and the sampling piece (flexible flat cable) through the lead wire and the bonding piece, so as to provide a reliable sampling function. Moreover, the space between the poles of the battery cells and the spaces between the battery cells is utilized, without occupying extra space of the battery, and the energy density of the battery is improved.
  • the embodiment of the first aspect of the present disclosure provides a sampling assembly 100 .
  • the sampling assembly 100 is used for a battery 10, and the battery 10 includes at least two battery cells 200 arranged along a first direction.
  • the sampling assembly 100 includes a sampling piece 110 , a support base 120 , a conductive connecting piece 130 and a bonding piece 140 .
  • the sampling piece 110 is used for transmitting sampling signals, and the sampling piece 110 has a lead wire 111 .
  • the support seat 120 is used to support between two adjacent battery cells 200 along the first direction.
  • the conductive connection piece 130 is disposed on the support base 120 , and the lead wire 111 is connected to the conductive connection piece 130 .
  • One end of the bonding piece 140 is used to connect the conductive connecting piece 130 , and the other end of the bonding piece 140 is used to connect to the battery cell 200 for collecting the sampling signal of the battery cell 200 .
  • the first direction is perpendicular to the arrangement direction of the battery cells 200 when they are connected in series.
  • the sampling piece 110 is connected to the conductive connection piece 130 through the lead wire 111, and the conductive connection piece 130 is connected to the battery cell 200 in the battery 10 through the bonding piece 140, thereby realizing the connection between the sampling piece 110 and the battery cell 100.
  • the electrical connection between the battery cells 200 is used to collect the working parameters of the battery cells 200 through the sampling part 110 , and the sampling part 110 further transmits the sampling signal representing the working parameters of the battery cells 200 to an external monitoring device.
  • the embodiment of the present disclosure uses the bonding piece 140 to connect the conductive connecting piece 130 and the battery cell 200 .
  • the sampling assembly 100 in the embodiment of the present disclosure is beneficial to improve assembly efficiency and product yield.
  • the sampling part 110 refers to a component capable of collecting signals of parameters of the battery cell 200 . As shown in FIG. 3 , it can extend along the direction in which a plurality of battery cells 200 are arranged in series, and a plurality of lead wires 111 are arranged at intervals in the extending direction, and each lead wire 111 is respectively connected to a conductive connecting piece 130 . That is to say, the sampling signals of a plurality of battery cells 200 connected in series can be collected through one sampling unit 110 .
  • the sampling signal is a parameter capable of characterizing the working state of the battery cell 200 , such as voltage, internal resistance, and the like.
  • the lead wires 111 are various types of cables capable of transmitting electrical signals, and the specific types of the lead wires 111 are not limited in this application.
  • the conductive connecting sheet 130 is a sheet-like structure with conductive properties, such as a metal sheet.
  • the bonding member 140 is a connection structure that can be electrically connected to the conductive connecting piece 130 and the battery cell 200 by laser welding, for example, it can be a metal wire, a metal strip, and the like.
  • the support seat 120 has a shape that is adapted to the battery cells 200 so as to be stably supported between two adjacent battery cells 200 along the first direction. There is a certain redundant space between two adjacent battery cells 200 , and part of the structure of the support base 120 can be accommodated in the redundant space, so as to avoid protruding from the battery cells 200 and increasing the overall volume of the battery 10 .
  • the support seat 120 includes a positioning portion 121 and a supporting portion 122 , wherein the positioning portion 121 is used to adapt to the shape of the battery cell 200 , that is, In other words, if the battery cell 200 is cylindrical, the positioning portion 121 is formed with an arc surface so as to fit the cylindrical battery cell 200; if the battery cell 200 is prismatic, the positioning portion 121 A prism surface is formed on the top so that it can be attached to the prismatic battery cell 200 .
  • the supporting part 122 is located between two adjacent positioning parts 121 along the first direction.
  • the positioning portion 121 is a structure on the support base 120 mainly used for positioning with the battery cell 200
  • the support portion 122 is a structure on the support base 120 mainly used to provide a mounting base for the conductive connecting piece 130 .
  • the positioning portion 121 is adapted to the shape of the battery cell 200, the positioning portion 121 of the support seat 120 can fit the battery cell 200 well, and the support of the support seat 120 The portion 122 is located between the two positioning portions 121 , so that the support base 120 can be positioned relatively stably between two adjacent battery cells 200 along the first direction.
  • the shape of the battery cell 200 includes a side surface 220 of the battery cell 200 and an end surface 230 of the battery cell 200 .
  • the side surface 220 of the battery cell 200 is a cylindrical surface arranged around the circumference of the battery cell 200 , and the end surface of the battery cell 200 is located at the end of the battery cell 200 circular face.
  • a part of the positioning part 121 of the support seat 120 is attached to the side surface 220 of the battery cell 200, and the other part is attached to the end surface 230 of the battery cell 200, thereby enabling the positioning part 121 to be positioned At the end position of the battery cell 200 .
  • the pole 210 of the battery cell 200 is located at the end of the battery cell 200 , and the part on the battery cell 200 connected with the bonding member 140 may be the pole 210 of the battery cell 200 .
  • the positioning part 121 can be positioned at the end of the battery cell 200, so that the support base 120 can be relatively stably supported between two adjacent battery cells 200 along the first direction. And it is at the end position of the battery cell 200, so that it is beneficial to reduce the length of the bonding member 140, which in turn is beneficial to reduce the working stroke of the laser welding equipment when performing laser welding, so as to improve the distance between the sampling assembly 100 and the battery 10. assembly efficiency.
  • the bonding member 140 may be an aluminum wire. Since the pole 210 of the battery cell 200 is usually made of aluminum, aluminum wire is used as the bonding element 140 so that the bonding element 140 and the pole 210 are made of the same material, so that the bonding effect after welding will be better. In some other embodiments, the bonding element 140 may also be other metal wires than aluminum.
  • the conductive connecting piece 130 is a metal piece.
  • the conductive connecting sheet 130 may be a nickel sheet, and the nickel sheet is not easily oxidized by oxygen in the air at room temperature, so it has better corrosion resistance.
  • nickel and aluminum are easy to weld. Therefore, when the bonding piece 140 is an aluminum wire and the conductive connecting piece 130 is a nickel sheet, the welding effect between the bonding piece 140 and the conductive connecting piece 130 will be better, and it is not easy to appear. Weld problem.
  • the conductive connecting sheet 130 is a sheet structure in which all parts are arranged on the supporting part 122.
  • the pole 210 and the conductive connecting piece 130 have a position difference, by setting the program of the laser welding equipment, in this case, the bonding member 140 and the conductive connecting piece 130 can be welded by the laser welding equipment , and welding the bonding member 140 to the pole 210 of the battery cell 200 .
  • the conductive connecting sheet 130 includes a first segment 131 , a second segment 132 and a third segment 133 connected in sequence, the first segment 131 and the third section 133 are not in the same plane, so that the conductive connecting piece 130 forms a ladder structure, the lead wire 111 is connected to the first section 131 , and one end of the bonding member 140 is connected to the third section 133 .
  • the conductive connecting piece 130 forms a stepped structure, wherein the first section 131 of the stage structure is connected to the lead 111, the third section 133 is connected to the bonding element 140, and through the connection and transition of the second section 132, The third section 133 may extend to be aligned with the pole 210 of the battery cell 200 (ie, the third section 133 and the pole 210 are adjacent to each other in the first direction).
  • the length of the bonding member 140 can be further reduced, thereby further reducing the working stroke of the laser welding equipment when performing laser welding, thereby further improving the assembly efficiency of the sampling assembly 100 and the battery 10 assembly.
  • each bonding member 140 can be substantially on a straight line, so that the laser welding equipment can perform laser welding continuously by executing a relatively simple control program, so as to The bonding pieces 140 on the same straight line are welded one by one, that is, the welding process is easy to implement and control.
  • the support base 120 further includes a spacer 123, which is arranged on the side of the support portion 122 facing away from the battery cell 200, and the spacer 123 is used to space apart adjacent batteries arranged along the second direction.
  • the sampling assembly 100 is the second direction is the direction in which the plurality of battery cells 200 are arranged in series.
  • the support base 120 further includes a spacer 123 for spaced apart from adjacent sampling assemblies 100 arranged along the second direction.
  • the spacer 123 can be offset against the support seat 120 of the adjacent sampling assembly 100, thereby enhancing the stability of the positioning of the support seat 120 and preventing the support seat 120 from moving in the second direction.
  • the spacer 123 may be a rectangular block structure. In this way, its shape is relatively regular, and when it abuts against the support seat 120 of the adjacent sampling assembly 100 , the force on the sampling assembly 100 can be uniform.
  • the third section 133 can be further fixedly disposed on the spacer 123 . Since the spacer 123 is disposed on the side of the support portion 122 away from the battery cell 200 , the spacer 123 is in a position substantially parallel to the pole 210 of the battery cell 200 , and the third section 133 of the conductive connecting piece 130 Fixed on the spacer 123, on the one hand, it can meet the position setting requirements of the third section 133 (make the third section 133 and the pole 210 adjacent to each other in the first direction), and in addition, it is beneficial to improve the conductive connecting piece.
  • the structural strength and structural rigidity of 130 prevent the conductive connecting sheet 130 from being deformed when subjected to external force.
  • the battery cell 200 is provided with a pole 210 protruding from the end surface 230 of the battery cell 200 , and when the supporting base 120 is supported between two adjacent battery cells 200 along the first direction , the heights of both ends of the bonding element 140 are substantially the same.
  • the heights of both ends of the bonding member 140 are substantially the same, that is, the end of the bonding member 140 connected to the third section 133 is substantially at the same level as the end of the bonding member 140 connected to the pole 210. height.
  • the laser welding equipment can perform the operations of welding the bonding part 140 and the third segment 133 and welding the bonding part 140 and the pole 210 in sequence without adjusting the downforce, so as to further improve assembly efficiency .
  • a covering portion 134 for covering at least part of the lead wire 111 is disposed on the conductive connecting sheet 130 .
  • the connection between the lead wire 111 and the conductive connecting piece 130 can be made more firm, so as to avoid accidental separation between the two.
  • the cladding portion 134 can specifically be a semi-arc structure or a U-shaped structure, so that a groove that can accommodate the lead wire 111 is formed on the cladding portion 134.
  • the sampling assembly 100 further includes a metal gasket 150 , and the metal gasket 150 is disposed between the conductive connecting piece 130 and the support seat 120 .
  • the conductive connecting piece 130 is generally set thinner (for example, when the conductive connecting piece 130 is a nickel sheet, its thickness is about 3mm), therefore, in the process of implementing laser welding, the conductive connecting piece 130 is easily welded through, so that Can cause poor soldering problems.
  • a metal spacer 150 is provided between the conductive connection piece 130 and the support base 120. Even if the conductive connection piece 130 is welded through, the bond 140 can still be connected to the conductive connection piece 130 through the metal spacer 150. The electrical connection between them, thereby avoiding the occurrence of poor welding problems.
  • the support seat 120 is made of insulating material.
  • the bonding member 140 , the conductive connecting piece 130 and the battery cell 200 can be isolated by the support seat 120 to ensure insulation performance.
  • the support portion 122 is a hollow trapezoidal block, and reinforcing ribs 1221 are provided in the cavity of the trapezoidal block.
  • the supporting portion 122 of the supporting seat 120 is a hollow trapezoidal block, and the top surface of the trapezoidal block is a flat plane, which can bear the pressure during laser welding.
  • the interior of the support seat 120 is hollow, so that the support seat 120 as a whole has a structure of equal wall thickness, which facilitates the implementation of the injection molding process.
  • the support portion 122 has a trapezoidal shape in shape, so that it is also beneficial to realize the positioning of the support portion 122 by utilizing the gap between two adjacent battery cells 200 in the first direction.
  • the reinforcing rib 1221 is provided in the cavity of the trapezoidal block, which can improve the structural strength and structural rigidity of the supporting part 122 .
  • the embodiment of the second aspect of the present disclosure provides a battery 10, and the battery 10 includes the sampling assembly 100 in the embodiment of the first aspect above.
  • the battery 10 also includes at least two battery cells 200 arranged along the first direction, the support seat 120 is supported between the two adjacent battery cells 200 along the first direction, and the other end of the bonding member 140 is used for The battery cells 200 are connected.
  • the sampling assembly 100 is connected to the conductive connection piece 130 through the lead wire 111, and the conductive connection piece 130 is connected to the battery cell 200 in the battery 10 through the bonding member 140, thereby realizing the connection between the sampling part 110 and the battery.
  • the electrical connections between the cells 200 are used to collect the working parameters of the battery cells 200 through the sampling part 110 , and the sampling part 110 further transmits the sampling signal representing the working parameters of the battery cells 200 to an external monitoring device.
  • the embodiment of the present disclosure uses the bonding piece 140 to connect the conductive connecting piece 130 and the battery cell 200 .
  • the assembly 100 When the assembly 100 is assembled with the battery 10, there is no need to apply a downward force, and the connection between the bonding piece 140 and the conductive connecting piece 130 and between the bonding piece 140 and the battery cell 200 can be realized through laser welding equipment, so that the assembly efficiency is higher. At the same time, it will not face the problem of deformation or damage, that is, the yield rate of assembly will be higher.
  • the embodiment of the third aspect of the present disclosure provides an electric device, and the electric device includes the battery 10 in the embodiment of the second aspect above.
  • the electric device in the embodiment of the present disclosure it has the same inventive concept as the battery 10 in the embodiment of the second aspect above, therefore, the electric device in the embodiment of the present disclosure can obtain the above-mentioned second aspect The full benefit of the battery 10 in the embodiments.
  • the embodiment of the fourth aspect of the present disclosure provides a manufacturing method of the sampling assembly 100, the battery 10 includes at least two battery cells 200 arranged along the first direction, and is characterized in that it includes:
  • a sampling piece 110 is provided for transmitting a sampling signal, and the sampling piece 110 has a lead wire;
  • the conductive connection piece 130 is arranged on the support seat 120, and the lead wire is connected to the conductive connection piece 130;
  • a bonding piece 140 is provided, one end of the bonding piece 140 is used to connect the conductive connecting piece 130 , and the other end of the bonding piece 140 is used to connect to the battery cell 200 for collecting the sampling signal of the battery cell 200 .
  • the sampling part 110 in the manufactured sampling component 100 is connected to the conductive connecting piece 130 through a lead wire, and the conductive connecting piece 130 is connected to the battery cells in the battery 10 through the bonding part 140 200, thereby realizing the electrical connection between the sampling part 110 and the battery cell 200, so that the working parameters of the battery cell 200 are collected through the sampling part 110, and the sampling part 110 further characterizes the working parameters of the battery cell 200
  • the sampled signal is transmitted to an external monitoring device.
  • the embodiment of the present disclosure uses the bonding piece 140 to connect the conductive connecting piece 130 and the battery cell 200 .
  • the sampling assembly 100 in the embodiment of the present disclosure is beneficial to improve assembly efficiency and product yield.
  • the conductive connecting sheet 130 with a stepped structure is adopted, so that the top surface of the partial structure of the conductive connecting sheet 130 (specifically, the third section 133 ) and the top arc surface of the pole 210 of the battery cell 200 Keep it horizontal so that the two ends of the bonding piece 140 are kept on the same level.
  • it is beneficial to reduce the length of the bonding member 140 thereby further reducing the working stroke of the laser welding equipment when performing laser welding, thereby further improving the assembly efficiency of the sampling assembly 100 and the battery 10 assembly.
  • the bonding parts 140 can be roughly in a straight line, so that the laser welding equipment can perform laser welding continuously by executing a relatively simple control program. , so that the bonding pieces 140 on the same straight line are welded one by one, the control parameters are the same and the strokes of the laser welding equipment are consistent. It can be seen that the welding process is easy to implement and easy to control, which is more conducive to improving manufacturing efficiency.
  • the common conductive connecting piece 130 is used without bending, so there is no need to open a bending mold, but the top surface of the conductive connecting piece 130 is in contact with the top arc of the pole 210 of the battery cell 200 The surface is not kept horizontal, that is, the two ends of the bonding element 140 are not on the same horizontal plane.
  • the conductive connecting piece 130 does not need to open a bending mold, so the precision of processing and forming is relatively low.
  • the conductive connecting piece 130 is assembled with the support base 120, there is no need to consider the relative positional relationship too much, so that the assembly process Easier.

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Abstract

本公开提供一种采样组件及其制造方法、电池及用电设备。采样组件用于电池，电池包括至少两个沿第一方向排列的电池单体，采样组件包括：采样件，用于传输采样信号，采样件具有引线；支撑座，用于支撑在沿第一方向相邻的两个电池单体之间；导电连接片，导电连接片设置在支撑座上，引线与导电连接片连接；和键合件，键合件的一端用于连接导电连接片，键合件的另一端用于连接电池单体，用于采集电池单体的采样信号。本公开实施例中的采样组件在与电池装配时无需施加下压力，通过激光焊接设备即可实现键合件与导电连接片以及键合件与电池单体之间的连接，从而装配效率更高，同时也不会面临变形或损坏的问题。

Description

采样组件及其制造方法、电池及用电设备 技术领域
本公开涉及电化学技术领域，特别涉及一种采样组件及其制造方法、电池及用电设备。
背景技术
本部分提供的仅仅是与本公开相关的背景信息，其并不必然是现有技术。
为了监控电池中电池单体的工作状态，通常在电池中设置采样组件，以便于能够实时测量电池单体的工作参数，例如电压、电流、温度等。相关技术中的采样组件，装配过程较为繁琐，导致装配效率较低，另外装配时也容易致使采样组件变形或损坏，影响最终产品的良率。
发明内容
本公开实施例的目的在于提供一种采样组件及其制造方法、电池及用电设备，以提高采样组件的装配效率和装配后的产品良率。
本公开第一方面的实施例提供了一种采样组件，用于电池，所述电池包括至少两个沿第一方向排列的电池单体，其特征在于，所述采样组件包括：采样件，用于传输采样信号，所述采样件具有引线；支撑座，用于支撑在沿所述第一方向相邻的两个所述电池单体之间；导电连接片，所述导电连接片设置在所述支撑座上，所述引线与所述导电连接片连接；和键合件，所述键合件的一端用于连接所述导电连接片，所述键合件的另一端用于连接所述电池单体，用于采集所述电池单体的采样信号。
根据本公开实施例的采样组件，其采样件通过引线连接导电连接片，导电连接片通过键合件连接电池中的电池单体，由此，实现采样件与电池单体之间的电性连接，从而通过采样件采集电池单体的工作参数，采样件再进一步将表征电池单体的工作参数的采样信号传输给外部监控设备。另外，本公开实施例利用键合件对导电连接片和电池单体进行连接，相比于相关技术中通过采样环套于电池单体上的方式，本公开实施例中的采样组件在与电池装配时无需施加下压力，通过激光焊接设备即可实现键合件与导电连接片以及 键合件与电池单体之间的连接，从而装配效率更高，同时也不会面临变形或损坏的问题，即装配的良率也会更高。综上，本公开实施例中的采样组件，有利于提高装配的效率以及产品的良率。
在本公开的一些实施例中，所述支撑座包括定位部和支撑部，所述定位部用于与所述电池单体的外形相适配，所述支撑部位于沿所述第一方向相邻的两个定位部之间。由此，使得支撑座可以较为稳定地定位在沿第一方向相邻的两个电池单体之间。
在本公开的一些实施例中，所述电池单体的所述外形包括所述电池单体的侧面和所述电池单体的端面。由此，使得支撑座可以较为稳定地支撑于沿第一方向相邻的两个电池单体之间且处于电池单体的端部位置，这样，有利于减小键合件的长度，进而有利于减小激光焊接设备在实施激光焊接时的工作行程，以提高采样组件与电池之间的装配效率。
在本公开的一些实施例中，所述导电连接片为各部分均设置在所述支撑部上的片状结构。通过对激光焊接设备的程序进行设定，在这种情况下能够利用激光焊接设备将键合件与导电连接片进行焊接，以及将键合件与电池单体的极柱进行焊接。
在本公开的一些实施例中，所述导电连接片包括顺次连接的第一部段、第二部段和第三部段，所述第一部段和所述第三部段不共面，以使所述导电连接片形成阶梯结构，所述引线连接所述第一部段，所述键合件的一端连接所述第三部段。由此，可以进一步减小键合件的长度，由此可以进一步减小激光焊接设备在实施激光焊接时的工作行程，从而进一步提高采样组件和电池组件的装配效率。
在本公开的一些实施例中，所述支撑座还包括间隔部，所述间隔部设置在所述支撑部的背离所述电池单体的一侧，所述间隔部用于间隔沿第二方向排列的相邻的采样组件。当采样组件装配在电池上时，间隔部可以与相邻的采样组件的支撑座相抵，从而可以增强支撑座定位的稳定性，避免支撑座在第二方向上窜动。
在本公开的一些实施例中，所述第三部段固定设置于所述间隔部上。由于间隔部设置在支撑部的背离电池单体的一侧，故而，间隔部处于与电池单 体的极柱大体并排的位置，将导电连接片的第三部段固定在间隔部上，一方面能够满足第三部段的位置设置要求，另外有利于提高导电连接片的结构强度和结构刚度，避免导电连接片在受到外力作用时发生变形。
在本公开的一些实施例中，所述电池单体上设置有凸出于所述电池单体的端面设置的极柱；在所述支撑座支撑于沿第一方向相邻的两个所述电池单体之间的情况下，所述键合件的两端的高度基本相同。这样，激光焊接设备可以在不调整下压力的情况下，依次实施将键合件与第三部段进行焊接、将键合件与极柱进行焊接的作业，以进一步提高装配效率。
在本公开的一些实施例中，所述导电连接片上设置有用于包覆至少部分所述引线的包覆部。由此，可以使引线和导电连接片之间连接得更为牢固，从而避免两者之间发生意外分离的情况。
在本公开的一些实施例中，所述采样组件还包括金属垫片，所述金属垫片设置在所述导电连接片和所述支撑座之间。即便将导电连接片焊穿，键合件依然可以通过金属垫片实现与导电连接片之间的电性连接，由此，避免焊接不良问题的发生。
在本公开的一些实施例中，所述支撑座由绝缘材料制成。由此，通过支撑座可以将键合件、导电连接片与电池单体隔绝开，以保证绝缘性能。
在本公开的一些实施例中，所述支撑部为内部中空的梯形块，在所述梯形块的空腔内设置有加强筋。支撑座的支撑部为内部中空的梯形块，梯形块的顶面为平坦的平面，在实施激光焊接的过程中，其可以承受焊接时的压力。另外，支撑座的内部中空，这样，使得支撑座整体为等壁厚的结构，从而有利于注塑成型工艺的实施。
本公开第二方面的实施例提供了一种电池，包括上述第一方面中任一实施例中的采样组件，所述电池还包括至少两个沿第一方向排列的电池单体，所述支撑座支撑在沿所述第一方向相邻的两个所述电池单体之间，所述键合件的所述另一端用于连接所述电池单体。
本公开第三方面的实施例提供了一种用电设备，其特征在于，包括上述第二方面中任一实施例中的电池。
本公开第四方面的实施例提供了一种采样组件的制造方法，所述电池包 括至少两个沿第一方向排列的电池单体，包括：提供采样件，用于传输采样信号，所述采样件具有引线；提供支撑座，用于支撑在沿所述第一方向相邻的两个所述电池单体之间；提供导电连接片，所述导电连接片设置在所述支撑座上，所述引线与所述导电连接片连接；和提供键合件，所述键合件的一端用于连接所述导电连接片，所述键合件的另一端用于连接所述电池单体，用于采集所述电池单体的采样信号。
附图说明
为了更清楚地说明本公开实施例和现有技术的技术方案，下面对实施例和现有技术中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，还可以根据这些附图获得其他的实施例。
图1为采用本申请实施例的电池的车辆的结构示意图；
图2为一种实施例中的电池的示意图；
图3为本申请一种实施例中的电池的结构示意图；
图4为本申请一种实施例中的采样组件的结构示意图；
图5为本申请一种实施例中的采样组件的分解示意图；
图6为本申请一种实施例中的电池在另一视角下的结构示意图；
图7为图4中A部分的放大结构示意图；
图8为本申请另一种实施例中的电池的结构示意图；
图9为图6中B部分的放大结构示意图；
图10为本申请另一种实施例中的电池的另一视角下的结构示意图；
图11为本申请另一种实施例中的采样组件的结构示意图；
图12为本申请另一种实施例中的采样组件的分解示意图；
图13为本申请中另一实施例中的采样组件的导电连接片的结构示意图。
具体实施方式
下面将参照附图更详细地描述本公开的示例性实施方式。虽然附图中显示了本公开的示例性实施方式，然而应当理解，可以以各种形式实现本公开而不应被这里阐述的实施方式所限制。相反，提供这些实施方式是为了能够 更透彻地理解本公开，并且能够将本公开的范围完整的传达给本领域的技术人员。
应理解的是，文中使用的术语仅出于描述特定示例实施方式的目的，而无意于进行限制。除非上下文另外明确地指出，否则如文中使用的单数形式“一”、“一个”以及“所述”也可以表示包括复数形式。术语“包括”、“包含”、“含有”以及“具有”是包含性的，并且因此指明所陈述的特征、步骤、操作、元件和/或部件的存在，但并不排除存在或者添加一个或多个其它特征、步骤、操作、元件、部件、和/或它们的组合。文中描述的方法步骤、过程、以及操作不解释为必须要求它们以所描述或说明的特定顺序执行，除非明确指出执行顺序。还应当理解，可以使用另外或者替代的步骤。
尽管可以在文中使用术语第一、第二、第三等来描述多个元件、部件、区域、层和/或部段，但是，这些元件、部件、区域、层和/或部段不应被这些术语所限制。这些术语可以仅用来将一个元件、部件、区域、层或部段与另一区域、层或部段区分开。除非上下文明确地指出，否则诸如“第一”、“第二”之类的术语以及其它数字术语在文中使用时并不暗示顺序或者次序。因此，以下讨论的第一元件、部件、区域、层或部段在不脱离示例实施方式的教导的情况下可以被称作第二元件、部件、区域、层或部段。
为了便于描述，可以在文中使用空间相对关系术语来描述如图中示出的一个元件或者特征相对于另一元件或者特征的关系，这些相对关系术语例如为“内部”、“外部”、“内侧”、“外侧”、“下面”、“下方”、“上面”、“上方”等。这种空间相对关系术语意于包括除图中描绘的方位之外的在使用或者操作中装置的不同方位。例如，如果在图中的装置翻转，那么描述为“在其它元件或者特征下面”或者“在其它元件或者特征下方”的元件将随后定向为“在其它元件或者特征上面”或者“在其它元件或者特征上方”。因此，示例术语“在……下方”可以包括在上和在下的方位。装置可以另外定向，例如旋转90度或者在其它方向，并且文中使用的空间相对关系描述符相应地进行解释。
如图1所示，为本申请一个实施例的一种车辆1的结构示意图，车辆1可以为燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、 混合动力汽车或增程式汽车等。车辆1的内部可以设置马达40、控制器30以及电池10，控制器30用来控制电池10为马达40的供电。例如，在车辆1的底部或车头或车尾可以设置电池10。电池10可以用于车辆1的供电，例如，电池10可以作为车辆1的操作电源，用于车辆1的电路系统，例如，用于车辆1的启动、导航和运行时的工作用电需求。在本申请的另一实施例中，电池10不仅仅可以作为车辆1的操作电源，还可以作为车辆1的驱动电源，替代或部分地替代燃油或天然气为车辆1提供驱动动力。
如图2所示，本申请的实施例所提到的电池10是指包括一个或多个电池单体200以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池10可以包括电池模组或电池包等。电池10一般包括用于封装一个或多个电池单体200的箱体300。箱体300可以避免液体或其他异物影响电池单体的充电或放电。具体地，箱体300可以包括上盖301和箱壳302，上盖301和箱壳302扣合在一起。上盖301和箱壳302的形状可以根据多个电池单体300组合的形状而定。
多个电池单体200可经由极柱而被串联和/或并联在一起以应用于各种应用场合。在一些诸如电动汽车等的大功率应用场合，电池的应用包括三个层次：电池单体、电池模组和电池包。电池模组是为了从外部冲击、热、振动等中保护电池单体，将一定数目的电池单体电连接在一起并放入一个框架中而形成的。电池包则是装入电动汽车的电池系统的最终状态。电池包一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。箱体一般由盖体和箱壳组成。目前的大部分电池包是在一个或多个电池模组上装配电池管理系统(BMS)、热管理部件等各种控制和保护系统而制成的。随着技术的发展，电池模组这个层次可以被省略，也即，直接由电池单体形成电池包。这一改进使得电池系统的重量能量密度、体积能量密度得到提升的同时零部件数量显著下降。本申请中所提到的电池包括电池模组或电池包。
本申请中，电池单体300可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等，本申请实 施例对此也不限定。电池单体一般按封装的方式分成三种：柱形电池单体、方体方形电池单体和软包电池单体，本申请实施例对此也不限定。
本申请实施例描述的技术方案均适用于各种使用电池的装置，例如，手机、便携式设备、笔记本电脑、电瓶车、电动玩具、电动工具、电动车辆、船舶和航天器等，例如，航天器包括飞机、火箭、航天飞机和宇宙飞船等。
在实际应用中，每个电池单体不可能完全相同。由于电池单体之间具有某些参数的微小差异(例如电压、内阻、SOC(荷电状态)等)，随着使用时间的增加，电池单体之间的差别会越来越大。由于这些差别的存在，使得电池单体的一致性变差，影响电池的整体性能，例如充放电的控制、电量均衡性的控制等，甚至会由于未采取合理的控制造成严重的起火、爆炸等事故。所以，在电池内会设置对电池单体的采样组件，在发现异常时可以作出相应的控制和处理。
对于非方壳形状的电池单体而言，例如圆柱电池单体、棱柱电池单体等，多个电池单体排布和/或堆叠形成电池时，各电池单体相邻的面之间存在一些多余的空间。本申请以圆柱电池为例，参见图3，沿第一方向排列的圆柱电池单体的侧面相邻，相邻侧面之间具有较大的冗余空间。发明人研究发现，这部分空间可以用来布置电池的采样组件，以尽可能将采样组件的零部件容纳在该部分空间内，避免凸出于电池单体而增加电池整体的体积。
已有的一些采样组件，通过部件与电池单体的极柱电连接，对电池单体的一些参数进行信号采集。并将采集的信号通过柔性扁平线缆(FFC)传输至电池管理系统，以便对各电池单体进行参数调整和控制。在对圆柱电池单体端盖上突出的极柱进行信号采集时，一般采用采样环的结构，与极柱进行电连接，进而采集电信号。由于可靠的电信号采集需要采样环与极柱进行过盈装配，则需要额外提供压紧力，将采样环卡在极柱上。这样的压紧装配操作比较困难、效率低、不易实现自动化装配。并且在装配时，采样环容易变形，可能出现零件损坏，影响产品良率。若没有及时发现这些装配不良的情况，还会影响整个电池的采样和电池管理。
为解决上述问题，使得采样环与极柱的连接更加可靠、阻抗更加稳定，一般还会使用焊接进行采样环与极柱的电连接。但焊接时热量较大，容易烧 坏采样环的包胶，焊接时散落的金属颗粒也会在焊接界面上影响焊接质量，抑或导致虚焊的问题。并且，对极柱进行焊接，当焊接寻址错位时，极容易对端盖或者壳体焊穿，造成电池单体的漏液风险。另一方面，采用焊接的连接方式，需要将极柱、采样环、柔性扁平线缆依次装配焊接，需要两道焊接工序，工艺复杂、操作繁琐、影响量产效率。
发明人基于上述采样组件存在的诸多问题，研究了一种新的采样组件。也即本申请的采样组件，直接将极柱与采样件(柔性扁平线缆)通过引线和键合件焊接键合，以提供可靠的采样功能。并且利用电池单体的极柱之间以及电池单体之间的空间，不占据电池的额外空间，提高了电池的能量密度。
鉴于此，如图3至图5以及图8、图9或所示，本公开第一方面的实施例提供了一种采样组件100。该采样组件100用于电池10，电池10包括至少两个沿第一方向排列的电池单体200。具体而言，采样组件100包括采样件110、支撑座120、导电连接片130和键合件140。采样件110用于传输采样信号，采样件110具有引线111。支撑座120用于支撑在沿第一方向相邻的两个电池单体200之间。导电连接片130设置在支撑座120上，引线111与导电连接片130连接。键合件140的一端用于连接导电连接片130，键合件140的另一端用于连接电池单体200，用于采集电池单体200的采样信号。其中，第一方向垂直于电池单体200进行串联时的排列方向。
根据本公开实施例的采样组件100，其采样件110通过引线111连接导电连接片130，导电连接片130通过键合件140连接电池10中的电池单体200，由此，实现采样件110与电池单体200之间的电性连接，从而通过采样件110采集电池单体200的工作参数，采样件110再进一步将表征电池单体200的工作参数的采样信号传输给外部监控设备。另外，本公开实施例利用键合件140对导电连接片130和电池单体200进行连接，相比于相关技术中通过采样环套于电池单体200上的方式，本公开实施例中的采样组件100在与电池10装配时无需施加下压力，通过激光焊接设备即可实现键合件140与导电连接片130以及键合件140与电池单体200之间的连接，从而装配效率更高，同时也不会面临变形或损坏的问题，即装配的良率也会更高。综上，本公开实施例中的采样组件100，有利于提高装配的效率以及产品的良率。
其中，采样件110是指能够对电池单体200的参数进行信号采集的元器件。如图3所示，其可以沿多个电池单体200进行串联时的排列方向延伸，并且在其延伸方向上间隔设置多个引线111，每一引线111分别与一个导电连接片130连接。也就是说，通过一个采样件110可以对具有串联关系的多个电池单体200的采样信号进行采集。采样信号为能够表征电池单体200的工作状态的参数，例如电压、内阻等。引线111为可传递电信号的各类线缆，本申请引线111的具体类型不做限制。导电连接片130为具有导电特性的片状结构，例如金属片。键合件140为可通过激光焊接的方式与导电连接片130、电池单体200实现电性连接的连接结构，例如，可以为金属丝、金属带等。
如图3所示，支撑座120具有与电池单体200相适配的外形，以便于能够稳定地支撑在沿第一方向相邻的两个电池单体200之间，另外，沿第一方向相邻的两个电池单体200之间具有一定的冗余空间，支撑座120的部分结构可以容纳于该冗余空间中，以避免凸出于电池单体200而增加电池10整体的体积。
在本公开的一些实施例中，如图4、图5所示，支撑座120包括定位部121和支撑部122，其中，定位部121用于与电池单体200的外形相适配，也就是说，如果电池单体200为圆柱形，则定位部121上形成有圆弧面，以便于能够与圆柱形的电池单体200相贴合，如果电池单体200为棱柱形，则定位部121上形成有棱柱面，以便于能够与棱柱形的电池单体200相贴合。支撑部122位于沿第一方向相邻的两个定位部121之间，这样，在两个定位部121与对应的电池单体200较为紧密地贴合的情况下，支撑部122处于两个电池单体200之间的冗余空间内。可以理解的是，定位部121为支撑座120上的主要用于与电池单体200进行定位的结构，支撑部122为支撑座120上的主要用于为导电连接片130提供安装基础的结构。在本实施例中，由于定位部121用于与电池单体200的外形相适配，故而支撑座120的定位部121能够很好地与电池单体200相贴合，而支撑座120的支撑部122处于两个定位部121之间，由此，使得支撑座120可以较为稳定地定位在沿第一方向相邻的两个电池单体200之间。
进一步地，如图3所示，电池单体200的所述外形包括电池单体200的 侧面220和电池单体200的端面230。以电池单体200为圆柱电池为例，此时，电池单体200的侧面220为围绕电池单体200的周向布置的圆柱面，电池单体200的端面为位于电池单体200的端部的圆形面。在本实施例中，支撑座120的定位部121的一部分与电池单体200的侧面220相贴合，另一部分与电池单体200的端面230相贴合，由此，使定位部121能够定位在电池单体200的端部位置。通常，电池单体200的极柱210位于电池单体200的端部，而电池单体200上的与键合件140连接的部位可以是电池单体200的极柱210。在本公开实施例中，定位部121能够定位在电池单体200的端部位置，由此，使得支撑座120可以较为稳定地支撑于沿第一方向相邻的两个电池单体200之间且处于电池单体200的端部位置，这样，有利于减小键合件140的长度，进而有利于减小激光焊接设备在实施激光焊接时的工作行程，以提高采样组件100与电池10之间的装配效率。
在本公开的一些实施例中，键合件140可以为铝丝。由于电池单体200的极柱210的材质通常为铝，那么以铝丝作为键合件140，可以使得键合件140与极柱210为同材质，这样焊接之后的键合效果会更好。在其它的一些实施例中，键合件140也可以是除铝以外的其它金属丝。
在本公开的一些实施例中，导电连接片130为金属片。在一个优选的示例中，导电连接片130可以是镍片，镍片在常温下不易被空气中的氧气氧化，因此具有较好的抗腐蚀性。另外，镍和铝之间易于焊接，因此，当键合件140为铝丝、导电连接片130为镍片时，键合件140和导电连接片130之间的焊接效果会较好，不易出现虚焊的问题。
在本公开的一些实施例中，如图5至图7所示，导电连接片130为各部分均设置在支撑部122上的片状结构，此时，在电池10进行串联的方向(即第二方向)上，极柱210和导电连接片130具有位置差，通过对激光焊接设备的程序进行设定，在这种情况下能够利用激光焊接设备将键合件140与导电连接片130进行焊接，以及将键合件140与电池单体200的极柱210进行焊接。
在本公开的另外一些实施例中，如图8至图13所示，导电连接片130包括顺次连接的第一部段131、第二部段132和第三部段133，第一部段131和 第三部段133不共面，以使导电连接片130形成阶梯结构，引线111连接第一部段131，键合件140的一端连接第三部段133。在本实施例中，导电连接片130形成阶梯结构，其中，阶段结构的第一部段131连接引线111，第三部段133连接键合件140，通过第二部段132的衔接以及过渡，可以使得第三部段133延伸至与电池单体200的极柱210并排(即第三部段133和极柱210在所述第一方向上彼此相邻)。由此，可以进一步减小键合件140的长度，由此可以进一步减小激光焊接设备在实施激光焊接时的工作行程，从而进一步提高采样组件100和电池10组件的装配效率。另外，当沿第一方向设置有数量较多的电池单体200时，各键合件140可以大体处于一条直线上，这样，激光焊接设备执行相对简单的控制程序即可连续实施激光焊接，以将处于同一条直线上的键合件140一一进行焊接，即焊接过程易于实现以及控制。
进一步地，如图11所示，支撑座120还包括间隔部123，间隔部123设置在支撑部122的背离电池单体200的一侧，间隔部123用于间隔沿第二方向排列的相邻的采样组件100。其中，第二方向为多个电池单体200进行串联时的排列方向。在本实施例中，支撑座120还包括用于间隔沿第二方向排列的相邻的采样组件100的间隔部123。当采样组件100装配在电池10上时，间隔部123可以与相邻的采样组件100的支撑座120相抵，从而可以增强支撑座120定位的稳定性，避免支撑座120在第二方向上窜动。具体地，间隔部123可以为矩形块状结构，这样，其外形较为规整，在与相邻的采样组件100的支撑座120相抵时，可以使采样组件100受力均匀。
进一步地，基于支撑座120还包括间隔部123的情况，第三部段133可以进一步固定设置于间隔部123上。由于间隔部123设置在支撑部122的背离电池单体200的一侧，故而，间隔部123处于与电池单体200的极柱210大体并排的位置，将导电连接片130的第三部段133固定在间隔部123上，一方面能够满足第三部段133的位置设置要求(使第三部段133和极柱210在所述第一方向上彼此相邻)，另外有利于提高导电连接片130的结构强度和结构刚度，避免导电连接片130在受到外力作用时发生变形。
进一步地，电池单体200上设置有凸出于电池单体200的端面230设置的极柱210，在支撑座120支撑于沿第一方向相邻的两个电池单体200之间的 情况下，键合件140的两端的高度基本相同。在本实施例中，键合件140的两端的高度基本相同，也就是说，键合件140与第三部段133连接的一端，和键合件140与极柱210连接的一端大体处于相同的高度上。这样，激光焊接设备可以在不调整下压力的情况下，依次实施将键合件140与第三部段133进行焊接、将键合件140与极柱210进行焊接的作业，以进一步提高装配效率。
在本公开的一些实施例中，如图13所示，导电连接片130上设置有用于包覆至少部分引线111的包覆部134。由此，可以使引线111和导电连接片130之间连接得更为牢固，从而避免两者之间发生意外分离的情况。其中，包覆部134具体可以为半圆弧状的结构或U形结构，这样，使包覆部134上形成有可容纳引线111的凹槽，在装配时，当引线111放置在凹槽内后，可以通过外力使半圆弧状的结构或U形结构变形，以使凹槽收缩，进而将引线111夹紧。
在本公开的一些实施例中，如图5、图12所示，采样组件100还包括金属垫片150，金属垫片150设置在导电连接片130和支撑座120之间。由于导电连接片130通常设置得较薄(例如当导电连接片130为镍片时，其厚度在3mm左右)，因此，在实施激光焊接的过程中，容易将导电连接片130焊穿，这样就会导致焊接不良的问题。在本实施例中，在导电连接片130和支撑座120之间设置金属垫片150，即便将导电连接片130焊穿，键合件140依然可以通过金属垫片150实现与导电连接片130之间的电性连接，由此，避免焊接不良问题的发生。
在本公开的一些实施例中，支撑座120由绝缘材料制成。由此，通过支撑座120可以将键合件140、导电连接片130与电池单体200隔绝开，以保证绝缘性能。
在本公开的一些实施例中，支撑部122为内部中空的梯形块，在梯形块的空腔内设置有加强筋1221。在本实施例中，支撑座120的支撑部122为内部中空的梯形块，梯形块的顶面为平坦的平面，在实施激光焊接的过程中，其可以承受焊接时的压力。另外，支撑座120的内部中空，这样，使得支撑座120整体为等壁厚的结构，从而有利于注塑成型工艺的实施。再者，支撑 部122在外形上呈梯形结构，这样，也有利于利用在第一方向上相邻的两个电池单体200之间的空隙，实现对支撑部122的定位。此外，在梯形块的空腔内设置加强筋1221，可以提高支撑部122的结构强度和结构刚度。
如图3、图8所示，本公开第二方面的实施例提供了一种电池10，电池10包括上述第一方面的实施例中的采样组件100。另外，电池10还包括至少两个沿第一方向排列的电池单体200，支撑座120支撑在沿第一方向相邻的两个电池单体200之间，键合件140的另一端用于连接电池单体200。
根据本公开实施例的电池10，其采样组件100通过引线111连接导电连接片130，导电连接片130通过键合件140连接电池10中的电池单体200，由此，实现采样件110与电池单体200之间的电性连接，从而通过采样件110采集电池单体200的工作参数，采样件110再进一步将表征电池单体200的工作参数的采样信号传输给外部监控设备。另外，本公开实施例利用键合件140对导电连接片130和电池单体200进行连接，相比于相关技术中通过采样环套于电池单体200上的方式，本公开实施例中的采样组件100在与电池10装配时无需施加下压力，通过激光焊接设备即可实现键合件140与导电连接片130以及键合件140与电池单体200之间的连接，从而装配效率更高，同时也不会面临变形或损坏的问题，即装配的良率也会更高。
本公开第三方面的实施例提供了一种用电设备，用电设备包括上述第二方面的实施例中的电池10。
根据本公开实施例中的用电设备，其与上述第二方面的实施例中的电池10出于相同的发明构思，因此，本公开实施例中的用电设备，能够获得上述第二方面的实施例中的电池10的全部有益效果。
本公开第四方面的实施例提供了一种采样组件100的制造方法，电池10包括至少两个沿第一方向排列的电池单体200，其特征在于，包括：
提供采样件110，用于传输采样信号，采样件110具有引线；
提供支撑座120，用于支撑在沿第一方向相邻的两个电池单体200之间；
提供导电连接片130，导电连接片130设置在支撑座120上，引线与导电连接片130连接；和
提供键合件140，键合件140的一端用于连接导电连接片130，键合件140 的另一端用于连接电池单体200，用于采集电池单体200的采样信号。
根据本公开实施例的采用组件的制造方法，其所制造出的采样组件100中的采样件110通过引线连接导电连接片130，导电连接片130通过键合件140连接电池10中的电池单体200，由此，实现采样件110与电池单体200之间的电性连接，从而通过采样件110采集电池单体200的工作参数，采样件110再进一步将表征电池单体200的工作参数的采样信号传输给外部监控设备。另外，本公开实施例利用键合件140对导电连接片130和电池单体200进行连接，相比于相关技术中通过采样环套于电池单体200上的方式，本公开实施例中的采样组件100在与电池10装配时无需施加下压力，通过激光焊接设备即可实现键合件140与导电连接片130以及键合件140与电池单体200之间的连接，从而装配效率更高，同时也不会面临变形或损坏的问题，即装配的良率也会更高。综上，本公开实施例中的采样组件100，有利于提高装配的效率以及产品的良率。
根据本申请的实施例，采用呈阶梯结构的导电连接片130，使得导电连接片130的部分结构(具体指第三部段133)的顶面与电池单体200的极柱210的顶弧面保持水平，从而使键合件140的两端保持在同一水平面上。这样，有利于减小键合件140的长度，由此可以进一步减小激光焊接设备在实施激光焊接时的工作行程，从而进一步提高采样组件100和电池10组件的装配效率。在工艺方面，当沿第一方向设置有数量较多的电池单体200时，各键合件140可以大体处于一条直线上，这样，激光焊接设备执行相对简单的控制程序即可连续实施激光焊接，以将处于同一条直线上的键合件140一一进行焊接，控制参数相同且激光焊接设备的行程一致，可见，焊接过程易于实现以及易于控制，更有利于提升制造效率。
根据本申请的另一实施例，采用普通的导电连接片130，不需进行弯折，故而无需开弯折模具，但导电连接片130的顶面与电池单体200的极柱210的顶弧面不保持水平，即键合件140的两端不在同一水平面上。对于零件方面，导电连接片130不需开弯折模具，故而加工成型的精度要求较低，另外，导电连接片130在与支撑座120装配时，也无需过多考虑相对位置关系，使得装配过程更加简便。
以上所述，仅为本公开较佳的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以权利要求的保护范围为准。

Claims (15)

  1. 一种采样组件，用于电池，所述电池包括至少两个沿第一方向排列的电池单体，其特征在于，所述采样组件包括：
    采样件，用于传输采样信号，所述采样件具有引线；
    支撑座，用于支撑在沿所述第一方向相邻的两个所述电池单体之间；
    导电连接片，所述导电连接片设置在所述支撑座上，所述引线与所述导电连接片连接；和
    键合件，所述键合件的一端用于连接所述导电连接片，所述键合件的另一端用于连接所述电池单体，用于采集所述电池单体的采样信号。
  2. 根据权利要求1所述的采样组件，其特征在于，所述支撑座包括定位部和支撑部，所述定位部用于与所述电池单体的外形相适配，所述支撑部位于沿所述第一方向相邻的两个定位部之间。
  3. 根据权利要求2所述的采样组件，其特征在于，所述电池单体的所述外形包括所述电池单体的侧面和所述电池单体的端面。
  4. 根据权利要求2或3所述的采样组件，其特征在于，所述导电连接片为各部分均设置在所述支撑部上的片状结构。
  5. 根据权利要求2或3所述的采样组件，其特征在于，所述导电连接片包括顺次连接的第一部段、第二部段和第三部段，所述第一部段和所述第三部段不共面，以使所述导电连接片形成阶梯结构，所述引线连接所述第一部段，所述键合件的一端连接所述第三部段。
  6. 根据权利要求5所述的采样组件，其特征在于，所述支撑座还包括间隔部，所述间隔部设置在所述支撑部的背离所述电池单体的一侧，所述间隔部用于间隔沿第二方向排列的相邻的采样组件。
  7. 根据权利要求6所述的采样组件，其特征在于，所述第三部段固定设置于所述间隔部上。
  8. 根据权利要求5所述的采样组件，其特征在于，所述电池单体上设置有凸出于所述电池单体的端面设置的极柱；
    在所述支撑座支撑于沿第一方向相邻的两个所述电池单体之间的情况下，所述键合件的两端的高度基本相同。
  9. 根据权利要求1至7中任一项所述的采样组件，其特征在于，所述导电连接片上设置有用于包覆至少部分所述引线的包覆部。
  10. 根据权利要求1至7中任一项所述的采样组件，其特征在于，所述采样组件还包括金属垫片，所述金属垫片设置在所述导电连接片和所述支撑座之间。
  11. 根据权利要求1至7中任一项所述的采样组件，其特征在于，所述支撑座由绝缘材料制成。
  12. 根据权利要求2至7中任一项所述的采样组件，其特征在于，所述支撑部为内部中空的梯形块，在所述梯形块的空腔内设置有加强筋。
  13. 一种电池，其特征在于，包括根据权利要求1至12中任一项所述的采样组件，所述电池还包括至少两个沿第一方向排列的电池单体，所述支撑座支撑在沿所述第一方向相邻的两个所述电池单体之间，所述键合件的所述另一端用于连接所述电池单体。
  14. 一种用电设备，其特征在于，包括根据权利要求13所述的电池。
  15. 一种采样组件的制造方法，所述电池包括至少两个沿第一方向排列 的电池单体，其特征在于，包括：
    提供采样件，用于传输采样信号，所述采样件具有引线；
    提供支撑座，用于支撑在沿所述第一方向相邻的两个所述电池单体之间；
    提供导电连接片，所述导电连接片设置在所述支撑座上，所述引线与所述导电连接片连接；和
    提供键合件，所述键合件的一端用于连接所述导电连接片，所述键合件的另一端用于连接所述电池单体，用于采集所述电池单体的采样信号。
PCT/CN2021/124390 2021-10-18 2021-10-18 采样组件及其制造方法、电池及用电设备 Ceased WO2023065067A1 (zh)

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