WO2023184267A1 - 连接装置、电池及电池制造方法 - Google Patents

连接装置、电池及电池制造方法 Download PDF

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Publication number
WO2023184267A1
WO2023184267A1 PCT/CN2022/084187 CN2022084187W WO2023184267A1 WO 2023184267 A1 WO2023184267 A1 WO 2023184267A1 CN 2022084187 W CN2022084187 W CN 2022084187W WO 2023184267 A1 WO2023184267 A1 WO 2023184267A1
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WO
WIPO (PCT)
Prior art keywords
resisting
battery
resisting part
housing
tab
Prior art date
Application number
PCT/CN2022/084187
Other languages
English (en)
French (fr)
Inventor
李铎
Original Assignee
宁德新能源科技有限公司
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 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to PCT/CN2022/084187 priority Critical patent/WO2023184267A1/zh
Publication of WO2023184267A1 publication Critical patent/WO2023184267A1/zh

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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding

Definitions

  • the present application relates to the field of energy storage technology, and in particular to a connection device, a battery and a battery manufacturing method.
  • the multi-lug structure of the battery can reduce the internal resistance of the cell, increase the charge and discharge rate, and meet the needs of fast charging and high-power discharge.
  • multiple tabs extend from the electrode assembly and are connected to the tab leads.
  • the tab leads need to be bent, a space for the bending area needs to be reserved in the packaging bag, resulting in a reduction in the energy density of the battery.
  • connection device a connection device, a battery and a battery manufacturing method provided with the connection device, so as to increase the energy density of the battery.
  • Embodiments of the present application provide a connecting device for connecting tabs.
  • the connection device includes electrically conductive parts.
  • the conductive member includes a main body part, and a first resisting part and a second resisting part connected to one end of the main body part. The first resisting part and the second resisting part are spaced apart. At least part of the pole lug extends between the first resisting part and the second resisting part.
  • connection device at least part of the pole lug extends between the first resisting part and the second resisting part, so that the first resisting part and the second resisting part are tightly connected to the pole lug.
  • the main body is used to connect the external circuit, so that the tabs are electrically connected to the external circuit.
  • the conductive member further includes a first connection part and a second connection part.
  • the first connecting part and the second connecting part are provided between the first resisting part and the second resisting part.
  • the first connecting part and the second connecting part are spaced apart and connected to the first resisting part and the second resisting part. Create the first space.
  • At least part of the pole extends into the first space.
  • the first resisting part and the second resisting part are used to limit the pole protruding between the first resisting part and the second resisting part, so as to reduce the risk of the pole detaching from the first space.
  • the connecting device is also used to connect the housing.
  • the connection device also includes a sealing member, which is disposed between the conductive member and the casing for sealing connection between the conductive member and the casing to improve the sealing performance of the casing and thereby improve the safety of the battery.
  • a first adhesive layer is provided on a side of the sealing member away from the conductive member.
  • the first adhesive layer includes a thermoplastic resin material, and the first adhesive layer is used for sealing connection with the housing.
  • Embodiments of the present application also provide a battery, including a case, an electrode assembly accommodated in the case, and at least two tabs, and the tabs are connected to the electrode assembly.
  • the battery also includes a connecting device, which is sealingly connected to the casing.
  • the connecting device includes a conductive member.
  • the conductive member includes a main body part, and a first resisting part and a second resisting part connected to the main body part.
  • the first resisting part and the second resisting part are connected to the main body part.
  • the second resisting parts are arranged at intervals. At least part of the pole lug extends between the first resisting part and the second resisting part.
  • the pole lug extends between the first resisting part and the second resisting part, so that the first resisting part and the second resisting part are tightly connected to the pole lug.
  • the main body is used to connect the external circuit, so that the tabs are electrically connected to the external circuit.
  • the tab extension end of the electrode assembly is the first end
  • the housing is provided with a first side wall
  • the first end and the first side wall are located on the same side of the electrode assembly along the first direction.
  • the first resisting part and the second resisting part extend into the housing, and one end of the main body part away from the first resisting part and the second resisting part protrudes from the first side wall.
  • One end of the tab is connected to the electrode assembly, and the other end of the tab extends between the first resisting part and the second resisting part.
  • connection device further includes a sealing member, which is disposed between the conductive member and the housing and sealingly connects the conductive member and the housing.
  • One end of the sealing member is located in the housing, and the other end of the sealing member protrudes from the first side wall.
  • the distance between one end of the sealing member located in the housing and the first end is less than 1 mm.
  • the electrode assembly includes a first surface and a second surface oppositely arranged along a second direction, and the second direction is perpendicular to the first direction.
  • the battery also includes a first glue layer and a second glue layer. The first glue layer is bonded to the connecting device and extends to the first surface; the second glue layer is bonded to the connecting device and extends to the second surface.
  • the tabs are located on between the first glue layer and the second glue layer to reduce the risk of tab corrosion and improve the structural stability of the battery.
  • An embodiment of the present application also provides a battery manufacturing method using any of the above connection devices, including:
  • the battery manufacturing method further includes at least one of the following (a) to (c):
  • the connecting device the battery provided with the connecting device and the battery manufacturing method of the present application
  • at least part of the tab extends between the first resisting part and the second resisting part, so as to facilitate the first resisting part and the second resisting part.
  • the holding part is closely connected with the pole ear.
  • the main body is used to connect the external circuit, so that the tabs are electrically connected to the external circuit.
  • the bent tab lead design is prone to the risk of short circuit when the electrode assembly is inserted during the production process due to the movable nature of the component. At the same time, it is bent during the packaging process.
  • the tab leads are also easy to pop out, causing the risk of defective products.
  • the conductive component of the present application is tightly connected to the tab through the first resisting part and the second resisting part connected to the main body, which overcomes the above problems and improves the process. reliability.
  • Figure 1 is a first structural schematic diagram of a connection device according to an embodiment of the present application.
  • FIG. 2 is a cross-sectional view along the line A-A in FIG. 1 .
  • Figure 3 is a cross-sectional view along the line B-B in Figure 1 .
  • Figure 4 is a first schematic view of the first inner surface and the second inner surface of the connection device according to an embodiment of the present application.
  • Figure 5 is a second schematic view of the first inner surface and the second inner surface of the connection device according to an embodiment of the present application.
  • Figure 6 is a third schematic view of the first inner surface and the second inner surface of the connection device according to an embodiment of the present application.
  • Figure 7 is a second structural schematic diagram of a connection device according to an embodiment of the present application.
  • Figure 8 is a third structural schematic diagram of a connection device according to an embodiment of the present application.
  • Figure 9 is a fourth structural schematic diagram of a connection device according to an embodiment of the present application.
  • FIG. 10 is a cross-sectional view along line C-C in FIG. 9 .
  • FIG. 11 is a first cross-sectional view along section line D-D in FIG. 9 .
  • Figure 12 is a fourth schematic view of the third inner surface and the fourth inner surface of the connecting device according to an embodiment of the present application.
  • FIG. 13 is a second cross-sectional view along section line D-D in FIG. 9 .
  • Figure 14 is a fifth schematic view of the third inner surface and the fourth inner surface of the connecting device according to an embodiment of the present application.
  • Figure 15 is a sixth schematic view of the third inner surface and the fourth inner surface of the connecting device according to an embodiment of the present application.
  • Figure 16 is a first structural schematic diagram of a battery according to an embodiment of the present application.
  • Figure 17 is a schematic diagram of the first glue layer and the second glue layer in the battery according to an embodiment of the present application.
  • Figure 18 is a second structural schematic diagram of a battery according to an embodiment of the present application.
  • Figure 19 is a schematic flowchart of a battery manufacturing method according to an embodiment of the present application.
  • Figure 20 is a schematic diagram of the existing tab leads.
  • the first space 10a is the first space 10a
  • the second adhesive layer 32 is the second adhesive layer 32
  • connection device for connecting tabs.
  • the connection device includes electrically conductive parts.
  • the conductive member includes a main body part, and a first resisting part and a second resisting part connected to one end of the main body part.
  • the first resisting part and the second resisting part are spaced apart. At least part of the pole lug extends between the first resisting part and the second resisting part.
  • connection device at least part of the pole lug extends between the first resisting part and the second resisting part, so that the first resisting part and the second resisting part are tightly connected to the pole lug.
  • the main body is used to connect the external circuit, so that the tabs are electrically connected to the external circuit.
  • connection device 100 One end of the connection device 100 is used to connect the tab 91 (see Figure 16), and the other end is used to connect to an external circuit (not shown).
  • the tab 91 is electrically connected to the external circuit.
  • the external circuit is a BMS (BATTERY MANAGEMENT SYSTEM, battery management system), and the external circuit is electrically connected to the tabs 91 through the connecting device 100, thereby electrically connecting the battery including the tabs 91 to the external circuit to implement data collection. , control, protection, communication, power calculation, signal transmission, power transmission and other functions.
  • the connection device 100 includes a conductive member 10 .
  • the conductive member 10 includes a main body 11 and a first resisting portion 12 and a second resisting portion 13 connected to one end of the main body 11 .
  • the first resisting part 12 and the second resisting part 13 are spaced apart, and at least part of the pole lug 91 extends between the first resisting part 12 and the second resisting part 13 so as to facilitate the first resisting part 12 and the second resisting part 13 .
  • the two resisting parts 13 are closely connected to the tabs 91 .
  • the main body 11 is used to connect an external circuit, so that the tabs 91 are electrically connected to the external circuit, and the battery including the tabs 91 is electrically connected to the external circuit.
  • the first resisting part 12 and/or the second resisting part 13 can be deformed under the action of external force, so as to facilitate clamping and extending between the first resisting part 12 and the second resisting part 13 .
  • the tabs 91 between the tabs 91 improve the tightness of the connection between the tabs 91 and the conductive member 10 .
  • first resisting part 12 and/or the second resisting part 13 are welded to the tabs 91 extending between the first resisting part 12 and the second resisting part 13 .
  • first resisting portion 12 and the second resisting portion 13 clamp the tab 91 extending between the first resisting portion 12 and the second resisting portion 13, and are connected with the first resisting portion 12 and the second resisting portion 13.
  • the pole lug 91 is welded and connected.
  • connection device 100 at least part of the pole lug 91 extends between the first resisting part 12 and the second resisting part 13, so that the first resisting part 12 and the second resisting part 13 are tightly connected with the pole lug 91.
  • the main body part 11 is used to connect an external circuit, so that the tab 91 is electrically connected to the external circuit.
  • the conductive member 10 does not need to be bent, which can save the space occupied by the connecting device 100 and improve the energy density of the battery.
  • the main body part 11 extends along the first direction Z, the first resisting part 12 and the second resisting part 13 are connected to one end of the main body part 11 in the first direction Z, and the main body part 11 is in the first direction Z.
  • the other end in direction Z is used to connect to external circuits.
  • the main body part 11 , the first resisting part 12 and the second resisting part 13 are integrally formed to improve the structural strength of the conductive member 10 .
  • the first resisting portion 12 and the second resisting portion 13 are spaced apart along the second direction X, and the second direction X is perpendicular to the first direction Z.
  • the first resisting portion 12 is provided with a first inner surface 121 on a side facing the second resisting portion 13
  • the second resisting portion 13 is provided with a second inner surface 131 on a side facing the first resisting portion 12 .
  • the first inner surface 121 and the second inner surface 131 are used to clamp the tab 91 extending between the first resisting part 12 and the second resisting part 13 .
  • the projection of the first inner surface 121 and the projection of the second inner surface 131 are overlapped along the second direction
  • the tab 91 between the first resisting part 12 and the second resisting part 13 improves the connection tightness between the tab 91 and the conductive member 10 .
  • the first inner surface 121 and the second inner surface 131 are both flat and arranged parallel to each other to increase the contact area between the first inner surface 121 and the tab 91. and increase the contact area between the second inner surface 131 and the tab 91 , thereby facilitating the first inner surface 121 and the second inner surface 131 to clamp the tab extending between the first resisting portion 12 and the second resisting portion 13 91. Improve the tightness of the connection between the tab 91 and the conductive member 10.
  • the first inner surface 121 and/or the second inner surface 131 are arc-shaped surfaces. Specifically, when viewed along the first direction Z, the first inner surface 121 gradually moves away from the second resisting portion 13 from both sides to the middle and extends in an arc, and/or, the second inner surface 131 gradually moves away from both sides toward the middle.
  • the first resisting portion 12 extends in an arc.
  • the middle position of the first inner surface 121 and the middle position of the second inner surface 131 can provide sufficient space to accommodate the tab 91 , thereby facilitating the tab 91 to extend between the first resisting portion 12 and the second resisting portion 13 .
  • the first inner surface 121 and/or the second inner surface 131 are rough surfaces to increase the friction coefficient of the first inner surface 121 and/or the second inner surface 131 .
  • the first inner surface 121 and the second inner surface 131 clamp the tab 91 extending between the first resisting part 12 and the second resisting part 13 , the first inner surface 121 and/or the second inner surface 131 The risk of displacement of the tab 91 can be reduced, thereby improving the tightness of the connection between the tab 91 and the conductive member 10 .
  • the third direction Y is defined to be perpendicular to the first direction Z and the second direction X.
  • the first inner surface 121 is a rough surface
  • the first inner surface 121 is provided with a plurality of first concave portions 121a and first convex portions 121b that are continuously arranged along the third direction Y.
  • the first concave portions 121a and the first convex portion 121b are connected end to end in order to increase the friction coefficient of the first inner surface 121.
  • the first concave portion 121a and the first convex portion 121b may be continuously disposed along the first direction Z and connected end to end in sequence.
  • the first concave portion 121a and the first convex portion 121b can be continuously arranged along any tilt direction between the first direction Z and the third direction Y and connected end to end in sequence.
  • the second inner surface 131 when the second inner surface 131 is a rough surface, the second inner surface 131 is provided with a rough surface along the third direction Y, or the first direction Z, or any direction between the first direction Z and the third direction Y.
  • a plurality of second concave portions 131a and second convex portions 131b are continuously arranged in an oblique direction, and the second concave portions 131a and the second convex portions 131b are connected end to end in order to increase the friction coefficient of the second inner surface 131.
  • the first resisting portion 12 includes a first portion 12a and a second portion 12b that are connected to each other.
  • the second portion 12b extends along the first direction Z, and the first portion 12a is connected to the main body. 11 and the second part 12b to play a transitional role between the main part 11 and the second part 12b.
  • the second resisting part 13 includes a third part 13a and a fourth part 13b that are connected to each other.
  • the fourth part 13b extends along the first direction Z.
  • the third part 13a is connected between the main part 11 and the fourth part 13b. It serves as a transition between the main body part 11 and the fourth part 13b.
  • both the first part 12a and the third part 13a extend in an arc shape, and along the first direction Z, the distance between the first part 12a and the third part 13a gradually increases, so that the second part 12b and the fourth portion 13b are spaced apart along the second direction X.
  • the first resisting part 12 and the second resisting part 13 clamp the tab 91
  • the first part 12a and the third part 13a can move toward each other under the action of external force to drive the second part 12b and the fourth part.
  • 13 b move toward each other to reduce the risk of damage to the structural strength of the conductive member 10 caused by excessive deformation of the first resisting portion 12 and the second resisting portion 13 .
  • the first part 12 a and the third part 13 a when viewed along the third direction Y, may extend along a straight line.
  • the first resisting portion 12 and the second resisting portion 13 are both extended along the first direction Z to simplify the production process.
  • the length of the first resisting part 12 in the third direction Y, the length of the second resisting part 13 in the third direction Y, and the length of the main body part 11 in the third direction Y are all equal in length, so that the current carrying capacity of the first resisting portion 12 , the second resisting portion 13 and the main body portion 11 can be adapted to improve the conductive stability of the conductive member 10 .
  • the conductive member 10 further includes a first connecting part 14 and a second connecting part 15 .
  • the first connecting part 14 and the second connecting part 15 are provided between the first resisting part 12 and the second resisting part 13 .
  • the first connecting part 14 and the second connecting part 15 are spaced apart from the first resisting part 12 It is connected with the second resisting portion 13 to form a first space 10a, and at least part of the tab 91 extends into the first space 10a.
  • the first resisting part 12 and the second resisting part 13 are used to limit the pole lug 91 extending between the first resisting part 12 and the second resisting part 13 to reduce the pole lug 91 from the first space 10a. risk of disengagement.
  • first connecting portion 14 and the second connecting portion 15 are spaced apart along the third direction Y, and the first resisting portion 12 , the second resisting portion 13 , the first connecting portion 14 and the second connecting portion 15 are surrounded to form First space 10a.
  • First space 10a along the first direction Z, one end of the first space 10a toward the main body 11 is connected by the main body 11 or the first resisting part 12 and the second resisting part 13 (ie, the end of the first part 12a and the third part 13a The end connection) is closed, the first opening 10b is provided at one end of the first space 10a away from the main body 11, and the tab 91 extends into the first space 10a from the first opening 10b.
  • the first connecting part 14 is provided with a third inner surface 141 on one side facing the second connecting part 15, and the second connecting part 15 is provided with a third inner surface 141 on one side facing the first connecting part 14.
  • the third inner surface 141 and the fourth inner surface 151 are used to limit the tab 91 extending between the first resisting part 12 and the second resisting part 13 .
  • the third inner surface 141 and the fourth inner surface 151 are both flat and arranged parallel to each other, so that the first space 10a forms a regular space to facilitate the tab 91 to be accommodated in the first space. in space 10a.
  • Both the third inner surface 141 and the fourth inner surface 151 are flat surfaces.
  • the distance between the third inner surface 141 and the fourth inner surface 151 is The distance gradually increases along the first direction Z to expand the area of the first opening 10b, thereby facilitating the tab 91 to extend from the first opening 10b into the first space 10a.
  • the third inner surface 141 and/or the fourth inner surface 151 are arc-shaped surfaces.
  • the third inner surface 141 and/or the fourth inner surface 151 are provided between the first inner surface 121 and the second inner surface 131 so that the first inner surface 121 and the second inner surface 131 pass through the third inner surface 141 and/or Or the fourth inner surface 151 has a smooth transition to reduce the risk of damage to the tab 91 extending into the first space 10a.
  • the third inner surface 141 and the fourth inner surface 151 are both flat surfaces, and the first inner surface 121 and/or the second inner surface 131 are rough surfaces.
  • the battery further includes an electrode assembly 92 and a housing 93 that accommodates the electrode assembly 92 .
  • the connecting device 100 is also used to connect the housing 93 to fix the relative position between the conductive member 10 and the tab 91.
  • the connection device 100 also includes a sealing member 20.
  • the sealing member 20 is provided between the conductive member 10 and the housing 93. It is used to seal the conductive member 10 and the housing 93, improve the sealing performance of the housing 93, and thereby improve the safety of the battery. .
  • the conductive member 10 passes through the housing 93 , the first resisting portion 12 and the second resisting portion 13 extend into the housing 93 , and the main body portion 11 is away from the first resisting portion 12 and the second resisting portion 13 .
  • One end extends from the housing 93, one end of the tab 91 is connected to the electrode assembly 92, the other end of the tab 91 extends between the first resisting part 12 and the second resisting part 13, and the sealing member 20 is provided on the conductive member 10 and the housing 93, and sealingly connect the conductive member 10 and the housing 93.
  • the side of the sealing member 20 facing away from the conductive member 10 is provided with a first adhesive layer 21 , the first adhesive layer 21 includes a thermoplastic resin material, and the first adhesive layer 21 is used for sealing connection with the housing 93 .
  • the sealing member 20 further includes an insulating material to insulate and isolate the conductive member 10 and the housing 93 to improve the safety of the battery core 90 .
  • An embodiment of the present application also provides a battery 200.
  • the battery 200 includes a housing 93, an electrode assembly 92 accommodated in the housing 93, and at least two tabs 91, and the tabs 91 are connected to the electrode assembly 92.
  • the battery 200 further includes a connection device 100 , which is sealingly connected to the housing 93 to fix the relative position between the conductive member 10 and the tab 91 .
  • the connection device 100 includes a conductive member 10 .
  • the conductive member 10 includes a main body 11 and a first resisting portion 12 and a second resisting portion 13 connected to one end of the main body 11 .
  • the first resisting part 12 and the second resisting part 13 are spaced apart, and at least part of the pole lug 91 extends between the first resisting part 12 and the second resisting part 13 so as to facilitate the first resisting part 12 and the second resisting part 13 .
  • the two resisting parts 13 are closely connected to the tabs 91 .
  • the pole tabs 91 extending between the first resisting part 12 and the second resisting part 13 have the same polarity, which is positive polarity or negative polarity.
  • the main body 11 is used to connect an external circuit, so that the tabs 91 are electrically connected to the external circuit, and the battery 200 is electrically connected to the external circuit.
  • the tab 91 extends between the first resisting part 12 and the second resisting part 13, so that the first resisting part 12 and the second resisting part 13 are closely connected with the tab 91 , the main body part 11 is used to connect an external circuit, so that the tab 91 is electrically connected to the external circuit.
  • the conductive member 10 does not need to be bent, which can save the space occupied by the connecting device 100 and improve the energy density of the battery 200.
  • the electrode assembly 92 includes a positive electrode piece, a negative electrode piece, and a separation film disposed between the positive electrode piece and the negative electrode piece.
  • the electrode assembly 92 is a laminate structure or a rolled structure.
  • the electrode assembly 92 is provided with multiple sides, and at least two tabs 91 are connected to the same side of the electrode assembly 92 and extend from the side.
  • the extending end of the tab 91 of the electrode assembly 92 is the first end 92a, and the first end 92a is the side surface of the electrode assembly 92 connected to the tab 91.
  • the housing 93 is provided with a plurality of side walls, and the plurality of side walls surround a closed space for accommodating the electrode assembly 92 .
  • the housing 93 is provided with a first side wall 931 , and the first end 92 a and the first side wall 931 are located on the same side of the electrode assembly 92 along the first direction Z.
  • the first resisting part 12 and the second resisting part 13 extend into the housing 93 , and one end of the main body part 11 away from the first resisting part 12 and the second resisting part 13 extends from the housing 93 .
  • One end of the pole lug 91 is connected to the electrode assembly 92, and the other end of the pole lug 91 extends between the first resisting part 12 and the second resisting part 13, so that the first resisting part 12 and the second resisting part 13 are in contact with each other.
  • the pole tabs 91 are tightly connected.
  • One end of the main body 11 away from the first resisting part 12 and the second resisting part 13 is used to connect an external circuit, so that the tab 91 is electrically connected to the external circuit.
  • connection device 100 also includes a sealing member 20.
  • the sealing member 20 is provided between the conductive member 10 and the housing 93, and is used to seal the conductive member 10 and the housing 93 to improve the housing.
  • the sealing performance of the body 93 is improved, thereby improving the safety of the battery core 90 .
  • one end of the sealing member 20 is located in the housing 93 , and the other end of the sealing member 20 protrudes from the first side wall 931 .
  • the distance L1 between the end of the seal 20 located in the housing 93 and the first end 92 a is less than 1 mm.
  • L1 can be one of 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, and any other value within 1mm.
  • the electrode assembly 92 includes a first surface 921 and a second surface 922 arranged oppositely along a second direction X.
  • the second direction X is arranged in the same direction and perpendicular to the thickness direction of the electrode assembly 92 .
  • the battery 200 also includes a first glue layer 31 and a second glue layer 32 .
  • the first adhesive layer 31 is bonded to the connecting device 100 and extends to the first surface 921 .
  • the second glue layer 32 is bonded to the connecting device 100 and extends to the second surface 922 .
  • the first glue layer 31 and the second glue layer 32 are respectively bonded to the portion of the seal 20 located inside the housing 93 .
  • the tab 91 is located between the first glue layer 31 and the second glue layer 32. Specifically, the part of the tab 91 between the first end 92a and the conductive member 10 is located between the first glue layer 31 and the second glue layer 32. During the period, the first glue layer 31 and the second glue layer 32 are respectively bonded to the tabs 91 in corresponding areas to reduce the risk of corrosion of the tabs 91 and improve the structural stability of the battery 200 .
  • the connecting device 100 is located at the center of the housing 93 in the second direction X to reduce the risk of the connecting device 100 protruding out of the housing 93 in the second direction space to increase the energy density of the battery 200.
  • the position of the connecting device 100 on the housing 93 in the second direction X can be offset to both sides according to actual requirements.
  • the connecting device 100 is positioned on the housing 93 in the second direction X and is biased toward the first surface 921 , or the connecting device 100 is positioned on the housing 93 and is biased toward the second surface 922 shift.
  • the battery manufacturing method includes:
  • the tab 91 extends between the first resisting portion 12 and the second resisting portion 13 so that the first resisting portion 12 and the second resisting portion 13 are closely connected to the tab 91
  • the main body part 11 is used to connect an external circuit, so that the tab 91 is electrically connected to the external circuit.
  • the conductive member 10 does not need to be bent, which can save the space occupied by the connecting device 100 and improve the energy density of the battery.
  • the battery manufacturing method further includes at least one of the following (a) to (c), wherein step (a) and step (b) can be implemented separately, and step (c) is performed after step (a) or step (b) can only be implemented after implementation.
  • Step (a) is performed before step S1.
  • the stacked plurality of tabs 91 are integrated by pre-welding to facilitate welding connection with the first resisting portion 12 and the second resisting portion 13.
  • Step (b) is performed after step S2.
  • the clamped tab 91 is welded to the first resisting portion 12 and the second resisting portion 13 to improve the connection between the tab 91 and the conductive member 10.
  • the connection strength improves the structural stability of the battery 200.
  • step (c) is performed after step (a) to remove burrs generated at the soldered connection.
  • step (c) is performed after step (b) to remove burrs generated at the welded connection, reduce the risk of the burrs piercing the housing 93 , and reduce the risk of the burrs piercing the pole pieces and causing short circuits.
  • the battery 200 is a secondary battery with model number 904275.
  • the battery 200 adopts the connection device 100 shown in FIGS. 1 to 3 of this application, and is connected to the tabs 91 and the housing 93 in the manner shown in FIG. 17 of this application.
  • the energy density of the battery 200 is 550Wh/L, and the distance L1 between the end of the seal 20 located in the housing 93 and the first end 92a is 0.5 mm.
  • connection device 100 shown in Figures 9 to 10 of the present application the energy density of the battery 200 is 550Wh/L, and the seal 20 is located between one end of the housing 93 and the first end 92a The distance L1 between them is 0.5mm.
  • Embodiment 1 The difference from Embodiment 1 is that the existing tab lead 95 shown in Figure 20 is used. One end of the tab lead 95 is connected to the tab 91, and the other end extends from the housing 93 after being bent at least once. , the sealing member 20 is provided between the tab lead 95 and the housing 93, the energy density of the battery 200 is 520Wh/L, the distance L2 between the end of the sealing member 20 located in the housing 93 and the first end 92a is 2.5mm.
  • Example 1 in Example 1 and Example 2 is smaller than L2 in Comparative Example 1, and the space occupied by the connecting device 100 is smaller than the space occupied by the existing tab lead 95 . Furthermore, it can be seen that the connection device 100 can improve the energy density of the battery compared with the conventional tab lead 95 .
  • the connecting device 100 the battery 200 provided with the connecting device 100, and the battery manufacturing method
  • at least part of the tab 91 extends between the first resisting portion 12 and the second resisting portion 13, so as to facilitate the first resisting portion 12 and the second resisting portion 13.
  • the holding portion 12 and the second resisting portion 13 are closely connected to the tabs 91 , and the main body portion 11 is used to connect the external circuit, so that the tabs 91 are electrically connected to the external circuit.
  • the conductive member 10 does not need to be bent, which can save the space occupied by the connecting device 100 and improve the energy density of the battery.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种连接装置，用于连接极耳。连接装置包括导电件。导电件包括主体部、以及连接于主体部一端的第一抵持部和第二抵持部，第一抵持部和第二抵持部间隔设置。极耳的至少部分伸入第一抵持部和第二抵持部之间。本申请还提供设有连接装置的电池，以及电池制造方法。上述连接装置、设有连接装置的电池以及电池制造方法中，极耳的至少部分伸入第一抵持部和第二抵持部之间，以便于第一抵持部和第二抵持部与极耳紧密连接。主体部用于连接外部电路，以使极耳与外部电路电连接。在电池包装过程中，与现有的需要弯折的极耳引线相比，导电件无需弯折，可节省连接装置占用的空间，提高电池的能量密度。

Description

连接装置、电池及电池制造方法 技术领域
本申请涉及储能技术领域，特别涉及一种连接装置、电池及电池制造方法。
背景技术
电池的多极耳结构可降低电芯内阻，提高充放电倍率，满足快充以及大功率放电的需要。现有的多极耳结构中，多个极耳从电极组件中伸出并与极耳引线连接。在包装过程中，由于极耳引线需要弯折，因此需要在包装袋内预留出弯折区域的空间，导致降低电池的能量密度。
发明内容
鉴于上述状况，有必要提供一种连接装置、以及设有该连接装置的电池和电池制造方法，以提升电池的能量密度。
本申请的实施例提供一种连接装置，用于连接极耳。连接装置包括导电件。导电件包括主体部、以及连接于主体部一端的第一抵持部和第二抵持部，第一抵持部和第二抵持部间隔设置。极耳的至少部分伸入第一抵持部和第二抵持部之间。
上述连接装置中，极耳的至少部分伸入第一抵持部和第二抵持部之间，以便于第一抵持部和第二抵持部与极耳紧密连接。主体部用于连接外部电路，以使极耳与外部电路电连接。在电池包装过程中，与现有的需要弯折的极耳引线相比，导电件无需弯折，可节省连接装置占用的空间，提高电池的能量密度。
本申请的一些实施例中，导电件还包括第一连接部和第二连接部。第一连接部和第二连接部设于第一抵持部和第二抵持部之间，第一连接部和第二连接部间隔设置且与第一抵持部和第二抵持部连接形成第一空间。极耳的至少部分伸入第一空间中。第一抵持部和第二抵持部用于对伸入第一抵持部和第二抵持部之间的极耳限位，以降低极耳从第一空间中脱离的风险。
本申请的一些实施例中，连接装置还用于连接壳体。连接装置还包括密封件，密封件设于导电件和壳体之间，用于密封连接导电件和壳体，以提高壳体的密封性能，进而提升电池的安全性。
本申请的一些实施例中，密封件背离导电件的一侧设有第一粘接层，第一粘接层包括热塑性树脂材料，第一粘接层用于与壳体密封连接。
本申请的实施例还提供一种电池，包括壳体、以及容纳于壳体中的电极组件和至少两个极耳，极耳连接电极组件。电池还包括连接装置，连接装置密封连接于壳体，连接装置包括导电件，导电件包括主体部、以及连接于主体部的第一抵持部和第二抵持部，第一抵持部和第二抵持部间隔设置。极耳的至少部分伸入第一抵持部和第二抵持部之间。
上述电池中，极耳的至少部分伸入第一抵持部和第二抵持部之间，以便于第一抵持部和第二抵持部与极耳紧密连接。主体部用于连接外部电路，以使极耳与外部电路电连接。在电池包装过程中，与现有的需要弯折的极耳引线相比，导电件无需弯折，可节省连接装置占用的空间，提高电池的能量密度。
本申请的一些实施例中，电极组件的极耳伸出端为第一端，壳体设有第一侧壁，第一端和第一侧壁沿第一方向位于电极组件的同一侧。第一抵持部和第二抵持部伸入壳体内，主体部背离第一抵持部和第二抵持部的一端从第一侧壁伸出。极耳的一端连接电极组件，极耳的另一端伸入第一抵持部和第二抵持部之间。
本申请的一些实施例中，连接装置还包括密封件，密封件设于导电件和壳体之间，且密封连接导电件和壳体。密封件一端位于壳体内，密封件的另一端从第一侧壁伸出。沿第一方向，密封件位于壳体内的一端与第一端之间的间距小于1mm。与现有的需要弯折的极耳引线相比，可减少密封件和第一端之间容纳极耳引线的空间，为电池提供更多的容量空间，进而提高电池的能量密度。
本申请的一些实施例中，电极组件包括沿第二方向相对设置的第一表面和第二表面，第二方向垂直第一方向。电池还包括第一胶层和第二胶层，第一胶层粘接于连接装置，并延伸至第一表面；第二胶层粘接于连接装置，并延伸至第二表面，极耳位于第一胶层和第二胶层之间，以降低极耳腐蚀的风险并提高电池的结构稳定性。
本申请的实施例还提供一种电池制造方法，应用如上述任一种连接装置，包括：
将多个极耳沿电芯厚度方向层叠并伸入第一抵持部和第二抵持部之间；
对第一抵持部和第二抵持部施加相向的压力，使第一抵持部和第二抵持部夹紧位于第一抵持部和第二抵持部之间的多个极耳。
本申请的一些实施例中，电池制造方法还包括以下(a)至(c)中的至少一者：
(a)将层叠后的多个极耳进行预焊；
(b)将夹紧后的极耳与第一抵持部和第二抵持部焊接连接；
(c)打磨焊接连接处。
本申请的连接装置、设有连接装置的电池以及电池制造方法中，极耳的至少部分伸入第一抵持部和第二抵持部之间，以便于第一抵持部和第二抵持部与极耳紧密连接。主体部用于连接外部电路，以使极耳与外部电路电连接。在电池包装过程中，与现有的需要弯折的极耳引线相比，导电件无需弯折，可节省连接装置及极耳的厚度叠加占用的空间，提高电池的能量密度。再者，相比于现有技术中，弯折的极耳引线的设计方案在生产过程中，由于该组件具有可活动性，容易出现插入电极组件的短路风险，同时，在包装过程中弯折的极耳引线也容易弹出，造成坏品的风险，本申请的导电件通过连接于主体部的第一抵持部和第二抵持部于极耳紧密连接，克服了以上问题，改善了工艺可靠性。
附图说明
图1是本申请的一个实施例的连接装置的第一结构示意图。
图2是图1沿A-A剖面线的剖面图。
图3是图1沿B-B剖面线的剖面图。
图4是本申请的一个实施例的连接装置中第一内表面和第二内表面的第一示意图。
图5是本申请的一个实施例的连接装置中第一内表面和第二内表面的第二示意图。
图6是本申请的一个实施例的连接装置中第一内表面和第二内表面的第三示意图。
图7是本申请的一个实施例的连接装置的第二结构示意图。
图8是本申请的一个实施例的连接装置的第三结构示意图。
图9是本申请的一个实施例的连接装置的第四结构示意图。
图10是图9沿C-C剖面线的剖面图。
图11是图9沿D-D剖面线的第一剖面图。
图12是本申请的一个实施例的连接装置中第三内表面和第四内表面的第四示意图。
图13是图9沿D-D剖面线的第二剖面图。
图14是本申请的一个实施例的连接装置中第三内表面和第四内表面的第五示意图。
图15是本申请的一个实施例的连接装置中第三内表面和第四内表面的第六示意图。
图16是本申请的一个实施例的电池的第一结构示意图。
图17是本申请的一个实施例的电池中第一胶层和第二胶层的示意图。
图18是本申请的一个实施例的电池的第二结构示意图。
图19是本申请的一个实施例的电池制造方法的流程示意图。
图20是现有的极耳引线示意图。
主要元件符号说明
连接装置                                100
电池                                    200
导电件                                  10
第一空间                                10a
第一开口                                10b
主体部                                  11
第一抵持部                              12
第一部分                                12a
第二部分                                12b
第一内表面                              121
第一凹部                              121a
第一凸部                              121b
第二抵持部                            13
第三部分                              13a
第四部分                              13b
第二内表面                            131
第二凹部                              131a
第二凸部                              131b
第一连接部                            14
第三内表面                            141
第二连接部                            15
第四内表面                            151
密封件                                20
第一粘接层                            21
第一胶层                              31
第二胶层                              32
极耳                                  91
电极组件                              92
第一端                                92a
第一表面                              921
第二表面                              922
壳体                                  93
第一侧壁                              931
极耳引线                              95
第一方向                              Z
第二方向                              X
第三方向                              Y如下具体实施方式将结合上述附图进一步说明本申请。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述，显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。
需要说明的是，当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中设置的元件。当一个元件被认为是“设置在”另一个元件，它可以是直接设置在另一个元件上或者可能同时存在居中设置的元件。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。本文所使用的术语“垂直的”、“水平的”、“左”、“右”、“顶”、“底”以及类似的表述只是为了说明的目的，并不用于限制本申请。
可以理解，当两元件平行/垂直设置时沿同一方向设置，两元件之间可存在一定的夹角，两元件之间的允许存在0-±10％的公差，两元件大于、等于或小于允许存在0-±10％的公差。
本申请的实施例提供了一种连接装置，用于连接极耳。连接装置包括导电件。导电件包括主体部、以及连接于主体部一端的第一抵持部和第二抵持部，第一抵持部和第二抵持部间隔设置。极耳的至少部分伸入第一抵持部和第二抵持部之间。
上述连接装置中，极耳的至少部分伸入第一抵持部和第二抵持部之间，以便于第一抵持部和第二抵持部与极耳紧密连接。主体部用于连接外部电路，以使极耳与外部电路电连接。在电池包装过程中，与现有的需要弯折的极耳引线相比，导电件无需弯折，可节省连接装置占用的空间，提高电池的能量密度。
结合附图，对本申请的实施例作进一步的说明。
请参阅图1，本申请的一个实施例提供了一种连接装置100，连接装置100一端用于连接极耳91(参阅图16)，另一端用于与外部电路(图未示)连接，以使极耳91与外部电路电连接。在一些实施例中，外部电路为BMS(BATTERY MANAGEMENT SYSTEM，电池管理系统)，外部电路通过连接装置100与极耳91 电连接，进而使包括极耳91的电池与外部电路电连接，实现数据采集、控制、保护、通讯、电量计算、信号传输、电能传输等功能。
连接装置100包括导电件10，导电件10包括主体部11、以及连接于主体部11一端的第一抵持部12和第二抵持部13。第一抵持部12和第二抵持部13间隔设置，极耳91的至少部分伸入第一抵持部12和第二抵持部13之间，以便于第一抵持部12和第二抵持部13与极耳91紧密连接。主体部11用于连接外部电路，以使极耳91与外部电路电连接，进而使包括极耳91的电池与外部电路电连接。
在一些实施例中，第一抵持部12和/或第二抵持部13可在外力的作用下产生形变，以便于夹紧伸入第一抵持部12和第二抵持部13之间的极耳91，提升极耳91和导电件10的连接紧密性。
在一些实施例中，第一抵持部12和/或第二抵持部13与伸入第一抵持部12和第二抵持部13之间极耳91焊接连接。
可以理解的是，在一些实施例中，第一抵持部12和第二抵持部13夹紧伸入第一抵持部12和第二抵持部13之间的极耳91，且与极耳91焊接连接。
上述连接装置100中，极耳91的至少部分伸入第一抵持部12和第二抵持部13之间，以便于第一抵持部12和第二抵持部13与极耳91紧密连接，主体部11用于连接外部电路，以使极耳91与外部电路电连接。在电池包装过程中，与现有的需要弯折的极耳引线相比，导电件10无需弯折，可节省连接装置100占用的空间，提高电池的能量密度。
在一些实施例中，主体部11沿第一方向Z延伸设置，第一抵持部12和第二抵持部13接于主体部11在第一方向Z上的一端，主体部11在第一方向Z上的另外一端用于连接外部电路。
在一些实施例中，主体部11、第一抵持部12和第二抵持部13为一体成型设置，以提高导电件10结构强度。
请一并参阅图2，在一些实施例中，第一抵持部12和第二抵持部13沿第二方向X间隔设置，第二方向X与第一方向Z垂直设置。第一抵持部12朝向第二抵持部13的一侧设有第一内表面121，第二抵持部13朝向第一抵持部12的一侧设有第二内表面131。第一内表面121和第二内表面131用于夹紧伸入第一抵持部12 和第二抵持部13之间的极耳91。
在一些实施例中，沿第二方向X，第一内表面121的投影和第二内表面131的投影重叠设置，以便于第一内表面121和第二内表面131完全重叠并夹紧伸入第一抵持部12和第二抵持部13之间的极耳91，提升极耳91和导电件10的连接紧密性。
请一并参阅图3和图4，在一些实施例中，第一内表面121和第二内表面131均为平面且相互平行设置，以提高第一内表面121和极耳91的接触面积，以及提升第二内表面131和极耳91的接触面积，进而便于第一内表面121和第二内表面131夹紧伸入第一抵持部12和第二抵持部13之间的极耳91，提升极耳91和导电件10的连接紧密性。
请参阅图5，在一些实施例中，第一内表面121和/或第二内表面131为弧形面。具体地，沿第一方向Z观察，第一内表面121由两侧向中间逐渐远离第二抵持部13并呈弧线延伸，和/或，第二内表面131由两侧向中间逐渐远离第一抵持部12并呈弧线延伸。第一内表面121的中间位置和第二内表面131的中间位置可预充足的空间容纳极耳91，进而便于极耳91伸入第一抵持部12和第二抵持部13之间。
请参阅图6，在一些实施例中，第一内表面121和/或第二内表面131为粗糙面，以增加第一内表面121和/或第二内表面131的摩擦系数。当第一内表面121和第二内表面131夹紧伸入第一抵持部12和第二抵持部13之间的极耳91时，第一内表面121和/或第二内表面131可降低极耳91位移的风险，进而提升极耳91和导电件10的连接紧密性。
具体地，定义第三方向Y垂直于第一方向Z和第二方向X。在一些实施例中，当第一内表面121为粗糙面时，第一内表面121上设有沿第三方向Y连续设置的多个第一凹部121a和第一凸部121b，第一凹部121a和第一凸部121b依次首尾相连，以使增加第一内表面121的摩擦系数。
在一些实施例中，第一凹部121a和第一凸部121b可沿第一方向Z连续设置且依次首尾相连。或第一凹部121a和第一凸部121b可沿第一方向Z和第三方向Y之间的任一倾斜方向连续设置且依次首尾相连。
可以理解的是，当第二内表面131为粗糙面时，第二内表面131上设有沿第三 方向Y、或第一方向Z、或第一方向Z和第三方向Y之间的任一倾斜方向连续设置的多个第二凹部131a和第二凸部131b，第二凹部131a和第二凸部131b依次首尾相连，以使增加第二内表面131的摩擦系数。
请再次参阅图2，在一些实施例中，第一抵持部12包括相互连接的第一部分12a和第二部分12b，第二部分12b沿第一方向Z延伸设置，第一部分12a连接于主体部11和第二部分12b之间，以在主体部11和第二部分12b之间起到过渡作用。第二抵持部13包括相互连接的第三部分13a和第四部分13b，第四部分13b沿第一方向Z延伸设置，第三部分13a连接于主体部11和第四部分13b之间，以在主体部11和第四部分13b之间起到过渡作用。
第一部分12a连接于主体部11的端部和第三部分13a连接于主体部11的端部相互连接。沿第三方向Y观察，第一部分12a和第三部分13a均呈弧形延伸，且沿第一方向Z，第一部分12a和第三部分13a之间的间距逐渐增大，以使第二部分12b和第四部分13b沿第二方向X间隔设置。
在第一抵持部12和第二抵持部13夹紧极耳91的过程中，第一部分12a和第三部分13a可在外力的作用下相向移动，以带动第二部分12b和第四部分13b相向移动，以降低第一抵持部12和第二抵持部13过度形变对导电件10结构强度造成损伤的风险。
请参阅图7，在一些实施例中，沿第三方向Y观察，第一部分12a和第三部分13a可沿直线延伸。
请参阅图8，在一些实施例中，沿第三方向Y观察，第一抵持部12和第二抵持部13均沿第一方向Z延伸设置，以简化生产工艺。
请再次参阅图3，在一些实施例中，第一抵持部12在第三方向Y上的长度、第二抵持部13在第三方向Y上的长度以及主体部11在第三方向Y上的长度均相等，以使第一抵持部12、第二抵持部13以及主体部11的电流负荷能力适配，提高导电件10的导电稳定性。
请一并参阅图9和图10，在一些实施例中，导电件10还包括第一连接部14和第二连接部15。第一连接部14和第二连接部15设于第一抵持部12和第二抵持部13之间，第一连接部14和第二连接部15间隔设置且与第一抵持部12和第二抵持 部13连接形成第一空间10a，极耳91的至少部分伸入第一空间10a中。第一抵持部12和第二抵持部13用于对伸入第一抵持部12和第二抵持部13之间的极耳91限位，以降低极耳91从第一空间10a中脱离的风险。
具体地，第一连接部14和第二连接部15沿第三方向Y间隔设置，第一抵持部12、第二抵持部13、第一连接部14和第二连接部15围设形成第一空间10a。沿第一方向Z，第一空间10a朝向主体部11的一端被主体部11或第一抵持部12和第二抵持部13的连接处(即第一部分12a端部和第三部分13a的端部连接处)封闭，第一空间10a远离主体部11的一端设有第一开口10b，极耳91从第一开口10b伸入第一空间10a中。
请一并参阅图11，在一些实施例中，第一连接部14朝向第二连接部15的一侧设有第三内表面141，第二连接部15朝向第一连接部14的一侧设有第四内表面151。第三内表面141和第四内表面151用于对伸入第一抵持部12和第二抵持部13之间的极耳91限位。
请一并参阅图12，在一些实施例中，第三内表面141和第四内表面151均为平面且相互平行设置，以使第一空间10a形成规整空间，便于极耳91容纳于第一空间10a中。
请参阅图13，第三内表面141和第四内表面151均为平面，沿主体部11至第一开口10b的第一方向Z上，第三内表面141和第四内表面151之间的间距沿第一方向Z逐渐增大，以扩大第一开口10b的面积，进而便于极耳91从第一开口10b伸入第一空间10a中。
请参阅图14，在一些实施例中，第三内表面141和/或第四内表面151为弧形面。第三内表面141和/或第四内表面151设于第一内表面121和第二内表面131之间，以使第一内表面121和第二内表面131通过第三内表面141和/或第四内表面151平滑过渡，降低对伸入第一空间10a中的极耳91造成损伤的风险。
请参阅图15，在一些实施例中，第三内表面141和第四内表面151均为平面，第一内表面121和/或第二内表面131为粗糙面。
请参阅图16，在一些实施例中，电池还包括电极组件92和容纳电极组件92的壳体93。连接装置100还用于连接壳体93，以固定导电件10与极耳91之间的相 对位置。连接装置100还包括密封件20，密封件20设于导电件10和壳体93之间，用于密封连接导电件10和壳体93，提高壳体93的密封性能，进而提升电池的安全性。
具体地，导电件10穿过壳体93，第一抵持部12和第二抵持部13伸入壳体93内，主体部11背离第一抵持部12和第二抵持部13的一端从壳体93中伸出，极耳91的一端连接电极组件92，极耳91的另一端伸入第一抵持部12和第二抵持部13之间，密封件20设于导电件10和壳体93之间，且密封连接导电件10和壳体93。
在一些实施例中，密封件20背离导电件10的一侧设有第一粘接层21，第一粘接层21包括热塑性树脂材料，第一粘接层21用于与壳体93密封连接。
在一些实施例中，密封件20还包括绝缘材料，以绝缘隔离导电件10和壳体93，提升电芯90的安全性。
请继续参阅图16，本申请的实施例还提供一种电池200。电池200包括壳体93、以及容纳于壳体93中的电极组件92和至少两个极耳91，极耳91连接电极组件92。电池200还包括连接装置100，连接装置100密封连接于壳体93，以固定导电件10与极耳91之间的相对位置。
连接装置100包括导电件10，导电件10包括主体部11、以及连接于主体部11一端的第一抵持部12和第二抵持部13。第一抵持部12和第二抵持部13间隔设置，极耳91的至少部分伸入第一抵持部12和第二抵持部13之间，以便于第一抵持部12和第二抵持部13与极耳91紧密连接。伸入第一抵持部12和第二抵持部13之间的极耳91的极性相同，为正极极性或负极极性。主体部11用于连接外部电路，以使极耳91与外部电路电连接，进而使电池200与外部电路电连接。
上述电池200中，极耳91的至少部分伸入第一抵持部12和第二抵持部13之间，以便于第一抵持部12和第二抵持部13与极耳91紧密连接，主体部11用于连接外部电路，以使极耳91与外部电路电连接。在电池200包装过程中，与现有的需要弯折的极耳引线相比，导电件10无需弯折，可节省连接装置100占用的空间，提高电池200的能量密度。
电极组件92包括正极极片、负极极片和设于正极极片和负极极片之间的隔离膜。可选地，电极组件92为叠片结构或卷绕结构。在一些实施例中，沿垂直于电 极组件92的厚度方向，电极组件92设有多个侧面，至少两个极耳91连接于电极组件92的同一侧面并从该侧面伸出。电极组件92的极耳91伸出端为第一端92a，第一端92a即为与极耳91相连的电极组件92的侧面。
壳体93设有多个侧壁，多个侧壁围设形成封闭的容纳电极组件92的空间。其中，壳体93设有第一侧壁931，第一端92a和第一侧壁931沿第一方向Z位于电极组件92的同一侧。
第一抵持部12和第二抵持部13伸入壳体93内，主体部11背离第一抵持部12和第二抵持部13的一端从壳体93中伸出。极耳91的一端连接电极组件92，极耳91的另一端伸入第一抵持部12和第二抵持部13之间，以便于第一抵持部12和第二抵持部13与极耳91紧密连接。主体部11背离第一抵持部12和第二抵持部13的一端用于连接外部电路，以使极耳91与外部电路电连接。
请继续参阅图16，在一些实施例中，连接装置100还包括密封件20，密封件20设于导电件10和壳体93之间，用于密封连接导电件10和壳体93，提高壳体93的密封性能，进而提升电芯90的安全性。
具体地，密封件20一端位于壳体93内，密封件20的另一端从第一侧壁931伸出。沿第一方向Z，密封件20位于壳体93内的一端与第一端92a之间的间距L1小于1mm。与现有的需要弯折的极耳引线相比，可减少密封件20和第一端92a之间容纳极耳引线的空间，为电池200提供更多的容量空间，进而提高电池200的能量密度。
可选地，L1可以为0.1mm、0.2mm、0.3mm、0.4mm、0.5mm、0.6mm、0.7mm、0.8mm、0.9mm、1mm、以及1mm以内其他任意数值中的一个。
请参阅图17，在一些实施例中，电极组件92包括沿第二方向X相对设置的第一表面921和第二表面922，第二方向X与电极组件92的厚度方向同向设置，且垂直第一方向Z。
电池200还包括第一胶层31和第二胶层32。第一胶层31粘接于连接装置100，并延伸至第一表面921。第二胶层32粘接于连接装置100，并延伸至第二表面922。具体地，第一胶层31和第二胶层32分别粘接于密封件20位于壳体93内的部分。
极耳91位于第一胶层31和第二胶层32之间，具体地，极耳91位于第一端 92a和导电件10之间的部分位于第一胶层31和第二胶层32之间，第一胶层31和第二胶层32分别与对应区域的极耳91粘接，以降低极耳91腐蚀的风险并提高电池200的结构稳定性。
在一些实施例中，连接装置100位于壳体93在第二方向X上的中心位置，以降低连接装置100在第二方向X上凸出于壳体93的风险，进而便于减少电池200整体占用的空间，提高电池200的能量密度。
请参阅图18，可以理解的是，在一些实施例中，连接装置100位于壳体93在第二方向X上的位置可以根据实际需求向两侧偏移。例如连接装置100位于壳体93在第二方向X上的位置朝向第一表面921的方向偏移，或连接装置100位于壳体93在第二方向X上的位置朝向第二表面922的方向偏移。
请参阅图19，本申请还提供一种电池制造方法，应用上述任一实施例中的连接装置100，电池制造方法包括：
S1，将多个极耳91沿电芯厚度方向层叠并伸入第一抵持部12和第二抵持部13之间；
S2，对第一抵持部12和第二抵持部13施加相向的压力，使第一抵持部12和第二抵持部13夹紧位于第一抵持部12和第二抵持部13之间的多个极耳91。
上述电池制造方法中，极耳91的至少部分伸入第一抵持部12和第二抵持部13之间，以便于第一抵持部12和第二抵持部13与极耳91紧密连接，主体部11用于连接外部电路，以使极耳91与外部电路电连接。在电池包装过程中，与现有的需要弯折的极耳引线相比，导电件10无需弯折，可节省连接装置100占用的空间，提高电池的能量密度。
在一些实施例中，电池制造方法还包括以下(a)至(c)中的至少一者，其中步骤(a)和步骤(b)可单独实施，步骤(c)在步骤(a)实施后或步骤(b)实施后才能实施。
(a)将层叠后的多个极耳91进行预焊；
(b)将夹紧后的极耳91与第一抵持部12和第二抵持部13焊接连接；
(c)打磨焊接连接处。
步骤(a)在步骤S1之前实施，在步骤(a)中，通过预焊使层叠后的多个极耳91形成整体，便于与第一抵持部12和第二抵持部13焊接连接。
步骤(b)在步骤S2之后实施，在步骤(b)中，通过夹紧后的极耳91与第一抵持部12和第二抵持部13焊接连接提高极耳91与导电件10的连接强度，提高电池200的结构稳定性。
在一些实施例中，步骤(c)在步骤(a)之后实施，以去除焊接连接处产生的毛刺。
在一些实施例中，步骤(c)在步骤(b)之后实施，以去除焊接连接处产生的毛刺，降低毛刺刺破壳体93的风险，以及降低毛刺刺穿极片导致短路的风险。
实施例1
电池200为型号为904275的二次电池，电池200采用本申请图1至图3所示的连接装置100，并采用本申请图17的方式与极耳91和壳体93连接。电池200的能量密度为550Wh/L，密封件20位于壳体93内的一端与第一端92a之间的间距L1为0.5mm。
实施例2
与实施例1不同之处在于，采用本申请图9至图10所示的连接装置100，电池200的能量密度为550Wh/L，密封件20位于壳体93内的一端与第一端92a之间的间距L1为0.5mm。
对比例1
与实施例1不同之处在于，采用图20所示的现有的极耳引线95的方式，极耳引线95一端连接极耳91，另一端从经过至少一次弯折后从壳体93伸出，密封件20设于极耳引线95和壳体93之间，电池200的能量密度为520Wh/L，密封件20位于壳体93内的一端与所述第一端92a之间的间距L2为2.5mm。
通过实施例1、实施例2和对比例1对比分析，实施例1和实施例2中的L1小于对比例1中的L2，连接装置100占用的空间小于现有的极耳引线95占用的空间。进而可知，连接装置100与现有的极耳引线95相比，可提高电池的能量密度。
综上，连接装置100、设有连接装置100的电池200以及电池制造方法中，极耳91的至少部分伸入第一抵持部12和第二抵持部13之间，以便于第一抵持部12和第二抵持部13与极耳91紧密连接，主体部11用于连接外部电路，以使极耳91与外部电路电连接。在电池包装过程中，与现有的需要弯折的极耳引线相比，导电件10无需弯折，可节省连接装置100占用的空间，提高电池的能量密度。
另外，本领域技术人员还可在本申请精神内做其它变化，当然，这些依据本申请精神所做的变化，都应包含在本申请所公开的范围。

Claims (10)

  1. 一种连接装置，用于连接极耳，所述连接装置包括导电件，其特征在于，
    所述导电件包括主体部、以及连接于所述主体部一端的第一抵持部和第二抵持部，所述第一抵持部和所述第二抵持部间隔设置，所述极耳的至少部分伸入所述第一抵持部和所述第二抵持部之间。
  2. 如权利要求1所述的连接装置，其特征在于，所述导电件还包括第一连接部和第二连接部，所述第一连接部和所述第二连接部设于所述第一抵持部和所述第二抵持部之间，所述第一连接部和所述第二连接部间隔设置且与所述第一抵持部和所述第二抵持部连接形成第一空间，所述极耳的至少部分伸入所述第一空间中。
  3. 如权利要求1所述的连接装置，所述连接装置还用于连接壳体，其特征在于，所述连接装置还包括密封件，所述密封件设于所述导电件和所述壳体之间，用于密封连接所述导电件和所述壳体。
  4. 如权利要求3所述的连接装置，其特征在于，所述密封件背离所述导电件的一侧设有第一粘接层，所述第一粘接层包括热塑性树脂材料，所述第一粘接层用于与所述壳体密封连接。
  5. 一种电池，包括壳体、以及容纳于所述壳体中的电极组件和至少两个极耳，所述极耳连接所述电极组件，其特征在于，所述电池还包括连接装置，所述连接装置密封连接于所述壳体，所述连接装置包括导电件，所述导电件包括主体部、以及连接于所述主体部的第一抵持部和第二抵持部，所述第一抵持部和所述第二抵持部间隔设置，所述极耳的至少部分伸入所述第一抵持部和所述第二抵持部之间。
  6. 如权利要求5所述的电池，其特征在于，所述电极组件的极耳伸出端为第一端，所述壳体设有第一侧壁，所述第一端和所述第一侧壁沿第一方向位于所述电极组件的同一侧，所述第一抵持部和所述第二抵持部伸入所述壳体内，所述主体部背离所述第一抵持部和所述第二抵持部的一端从所述第一侧壁伸出，所述极耳的一端连接所述电极组件，所述极耳的另一端伸入所述第一抵持部和所述第二抵持部之间。
  7. 如权利要求6所述的电池，其特征在于，所述连接装置还包括密封件， 所述密封件设于所述导电件和所述壳体之间，且密封连接所述导电件和所述壳体，所述密封件一端位于所述壳体内，所述密封件的另一端从所述第一侧壁伸出，沿所述第一方向，所述密封件位于所述壳体内的一端与所述第一端之间的间距小于1mm。
  8. 如权利要求6所述的电池，其特征在于，所述电极组件包括沿第二方向相对设置的第一表面和第二表面，所述第二方向垂直所述第一方向，所述电池还包括第一胶层和第二胶层，所述第一胶层粘接于所述连接装置，并延伸至所述第一表面，所述第二胶层粘接于所述连接装置，并延伸至所述第二表面，所述极耳位于所述第一胶层和第二胶层之间。
  9. 一种电池制造方法，应用如权利要求1至4中任一项所述的连接装置，其特征在于，包括：
    将多个极耳沿电芯厚度方向层叠并伸入第一抵持部和第二抵持部之间；
    对第一抵持部和第二抵持部施加相向的压力，使第一抵持部和第二抵持部夹紧位于第一抵持部和第二抵持部之间的多个极耳。
  10. 如权利要求9所述的电池制造方法，其特征在于，还包括以下(a)至(c)中的至少一者：
    (a)将层叠后的多个极耳进行预焊；
    (b)将夹紧后的极耳与第一抵持部和第二抵持部焊接连接；
    (c)打磨焊接连接处。
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JP2010267443A (ja) * 2009-05-13 2010-11-25 Mitsubishi Heavy Ind Ltd 二次電池及び二次電池の製造方法
CN202142599U (zh) * 2011-07-20 2012-02-08 吉安市优特利科技有限公司 一种锂离子动力电池极耳与盖板的连接组件
CN212648295U (zh) * 2020-06-05 2021-03-02 惠州锂威新能源科技有限公司 一种高效封装的极耳套
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CN113437444A (zh) * 2021-06-23 2021-09-24 东莞新能安科技有限公司 电化学装置和电子装置
CN114204221A (zh) * 2021-12-02 2022-03-18 宁德新能源科技有限公司 一种电化学装置、电池模组及电子装置

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