WO2020134748A1 - 二次电池、电池模组以及二次电池的制造方法 - Google Patents

二次电池、电池模组以及二次电池的制造方法 Download PDF

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Publication number
WO2020134748A1
WO2020134748A1 PCT/CN2019/119949 CN2019119949W WO2020134748A1 WO 2020134748 A1 WO2020134748 A1 WO 2020134748A1 CN 2019119949 W CN2019119949 W CN 2019119949W WO 2020134748 A1 WO2020134748 A1 WO 2020134748A1
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WIPO (PCT)
Prior art keywords
current collecting
axial direction
secondary battery
extending
electrode
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Ceased
Application number
PCT/CN2019/119949
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English (en)
French (fr)
Inventor
金海族
史东洋
陈宁
李振华
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Publication of WO2020134748A1 publication Critical patent/WO2020134748A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/04—Construction or manufacture in general
    • 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
    • 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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of batteries, in particular to a method for manufacturing a secondary battery, a battery module, and a secondary battery.
  • a secondary battery includes a case, an electrode assembly provided in the case, and a current collecting member connected to the electrode assembly.
  • the electrode assembly has a flat body portion and a tab extending from the body portion.
  • the current collecting member is disposed between the tab and the housing, and the connection area of the current collecting member extends along the axial direction of the housing receiving hole, so that the current collecting member will occupy more of the housing in the axial direction
  • the space affects the energy density of the secondary battery.
  • an embodiment of the present application provides a secondary battery, including: a case, the case includes an accommodating hole having an opening; a top cover assembly, the top cover assembly is sealedly connected with the case to cover the opening; an electrode assembly, provided In the accommodating hole, the electrode assembly includes two end faces opposite to the first direction perpendicular to the axial direction of the accommodating hole and tabs extending from each end face, and the number of electrode assemblies is more than two groups, and more than two groups
  • the electrode assembly is stacked in the axial direction;
  • the current collecting member includes an extension portion and a current collecting portion fixedly connected to the tab, the extension portion extends in the axial direction, and the current collecting portion has a phase opposite to the axial direction and the first direction
  • the connecting end extending in the vertical second direction, the current collecting portion is connected to the end of the extending portion away from the top cover assembly through the connecting end.
  • the number of the extending portions is more than two, the two or more extending portions are spaced apart along the second direction, and the extending portions are provided in one-to-one correspondence with the current collecting portions.
  • the number of extension portions and the number of current collecting portions are the same as the number of electrode assemblies, and the extension portions, current collecting portions and pole lugs are provided in one-to-one correspondence.
  • each current collecting portion and each pole ear are spaced apart in the axial direction, and each extension portion and each pole ear do not overlap in the axial direction.
  • the projections of the current collecting portion and the pole ear at least partially overlap, and the projections of the extension portion and the pole ear at least partially overlap.
  • the current collecting portion has a connecting surface fixedly connected to the tab, and a surface of the current collecting portion away from the extending portion forms a connecting surface.
  • the current collecting portion has a sheet structure, and the thickness direction of the current collecting portion is parallel to the first direction.
  • the current collecting portion is a sheet-like structure, and the thickness direction of the current collecting portion is parallel to the axial direction.
  • each group of electrode assemblies includes two electrode units, and the two electrode units are stacked in the axial direction.
  • the electrode unit has a sub-end face and a sub-tab extending from the sub-end face.
  • the sub-end faces form an end face, and two sub-poles of the same pole are collected to form a tab, and the sub-poles of one electrode unit extend axially from a region where the sub-end face is close to the other electrode unit.
  • the electrode unit has two wide faces and two narrow faces connecting the two wide faces, the two wide faces are disposed opposite each other in the axial direction, the wide faces and the narrow faces are alternately arranged, and the tabs extend from the end faces The two wide-surface regions adjacent to the two electrode units extend out.
  • the sub-pole ears are arranged closer to the other narrow surface with respect to the one narrow surface.
  • a secondary battery provided by an embodiment of the present application, it includes a case, an electrode assembly disposed in the case, and a current collector.
  • the current collecting member includes an extending portion extending in the axial direction of the receiving hole of the housing and a current collecting portion intersecting the extending portion.
  • the current collecting part connected to the extending part extends in the second direction and is connected to the tab, so that the current collecting part does not occupy too much space in the axial direction of the case, which is beneficial to increase the energy density of the secondary battery.
  • an embodiment of the present application provides a battery module including two or more secondary batteries as in the above embodiments, and two or more secondary batteries are arranged side by side.
  • a method for manufacturing a secondary battery is provided according to an embodiment of the present application, which includes:
  • a housing with a receiving hole the receiving hole has an opening
  • the more than two sets of electrode assemblies are stacked in the axial direction of the receiving hole.
  • the electrode assembly includes two end faces opposite to the first direction perpendicular to the axial direction and Poles extending from each end surface;
  • a current collecting part with a current collecting part and an extension part, connect and fix the current collecting part of the current collecting part with the lugs, so that the extension part extends in the axial direction, and the current collecting part has a direction perpendicular to the axial direction and the first direction The connecting end extending in the second direction;
  • the top cover assembly and the housing are hermetically connected to cover the opening, and the current collecting portion is connected to the end of the extension portion away from the top cover assembly through the connecting end.
  • FIG. 1 is a schematic structural diagram of a battery module according to an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a secondary battery according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of an exploded structure of a secondary battery according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of an electrode unit according to an embodiment of the present application.
  • FIG. 5 is a schematic cross-sectional structural view of an electrode unit according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a current collecting member according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a current collecting member according to another embodiment of the present application.
  • FIG. 8 is a schematic diagram of an exploded structure of a secondary battery according to another embodiment of the present application.
  • FIG. 9 is a schematic diagram of an exploded structure of a secondary battery according to another embodiment of the present application.
  • FIG. 10 is an enlarged view at A in FIG. 9;
  • FIG. 11 is a schematic structural diagram of a current collecting member according to another embodiment of the present application.
  • FIG. 12 is a schematic flowchart of a method for manufacturing a secondary battery according to an embodiment of the present application.
  • Top cover assembly 121, top cover plate; 122, pole;
  • Electrode assembly 13a, end face; 13b, pole ear;
  • 131 electrode unit; 131a, wide surface; 131b, narrow surface; 131c, sub-end surface; 131d, sub-polar ear;
  • X axial direction
  • Y first direction
  • Z second direction
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a Disconnected, or integrally connected; either directly connected or indirectly connected through an intermediary.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a Disconnected, or integrally connected; either directly connected or indirectly connected through an intermediary.
  • an embodiment of the present application provides a battery module 20 including: two or more secondary batteries 10 of this embodiment and a bus bar for connecting two secondary batteries 10.
  • Two or more secondary batteries 10 are arranged side by side in the same direction.
  • One end of the bus bar is connected and fixed to one of the two secondary batteries 10, and the other end is connected and fixed to the other secondary battery 10.
  • the two or more secondary batteries 10 of this embodiment can be arranged side by side in their thickness direction to form the battery module 20.
  • the secondary battery 10 of the embodiment of the present application includes a case 11, an electrode assembly 13 disposed in the case 11, and a top cover assembly 12 that is sealingly connected to the case 11.
  • the housing 11 of this embodiment may have a quadrangular prism shape or other shapes.
  • the housing 11 includes a receiving hole 11a having an opening.
  • the receiving hole 11a is used to receive the electrode assembly 13 and the electrolyte.
  • the housing 11 may be made of materials such as aluminum, aluminum alloy, or plastic.
  • the electrode assembly 13 of the embodiment of the present application includes two end faces 13a opposite to the first direction Y perpendicular to the axial direction X of the receiving hole 11a, and a tab 13b extending from each end face 13a.
  • the axial direction X of the receiving hole 11a of this embodiment is parallel to the extending direction of the receiving hole 11a itself.
  • a pole lug 13b extends from each end surface 13a of the electrode assembly 13.
  • Each electrode assembly 13 has two tabs 13b opposite in the first direction Y, one of the tabs 13b serves as a positive tab and the other serves as a tab.
  • the electrode assembly 13 of this embodiment includes one or more electrode units 131 stacked in the axial direction X of the receiving hole 11 a.
  • the electrode unit 131 has a sub-end surface 131c and a sub-tab 131d extending from the sub-end surface 131c.
  • the electrode unit 131 of this embodiment may form a body and a sub-pole ear 131d connected to the body by stacking or winding the first pole piece, the second pole piece, and the separator together.
  • the diaphragm is an insulator between the first pole piece and the second pole piece.
  • the electrode unit 131 of this embodiment includes a layer of diaphragm, a layer of first pole piece, a layer of diaphragm and a layer of second pole piece.
  • the first pole piece is exemplified as the positive electrode piece
  • the second pole piece is the negative electrode piece.
  • the first pole piece may also be a negative pole piece
  • the second pole piece is a positive pole piece.
  • the positive electrode active material is coated on the coating area of the positive electrode sheet
  • the negative electrode active material is coated on the coating area of the negative electrode sheet.
  • a plurality of uncoated regions extending from the body are used as sub-tab ears 131d.
  • One electrode unit 131 includes two sub-pole ears 131d arranged oppositely along the first direction Y, that is, a positive ear and a negative ear.
  • the positive electrode ear extends from the coating area of the positive electrode sheet; the negative electrode ear extends from the coating area of the negative electrode sheet.
  • the first direction Y is perpendicular to the axis X, and the vertical here is not limited to a strictly vertical definition in a mathematical sense.
  • the end surface 13a of each electrode assembly 13 includes the sub-end surfaces 131c of the respective electrode units 131, that is, all the sub-end surfaces 131c of all the electrode units 131 collectively form the end surface 13a.
  • the tabs 13b of a group of electrode assemblies 13 include sub-tabs 131d of each electrode unit 131, that is, all sub-tabs 131d of all electrode units 131 together form the tab 13b.
  • the electrode unit 131 has a flat structure, which has two wide surfaces 131a and two narrow surfaces 131b connecting the two wide surfaces 131a.
  • the two wide surfaces 131a are opposite to each other along the axial direction X.
  • the wide surface 131a and the narrow surface 131b are alternately provided.
  • the top cover assembly 12 of this embodiment is hermetically connected to the housing 11 to cover the opening.
  • the top cover assembly 12 includes a top cover plate 121 and a pole 122.
  • the top cover assembly 12 is hermetically connected to the housing 11 through the top cover plate 121.
  • the pole 122 is disposed on the top cover plate 121 and is electrically connected to the electrode assembly 13 through the current collector 14.
  • the secondary battery 10 of the embodiment of the present application includes more than two groups of electrode assemblies 13. Two or more sets of electrode assemblies 13 are stacked in the axial direction X.
  • the current collecting member 14 includes an extending portion 141 and a current collecting portion 142 connected and fixed to the tab 13b.
  • the extension 141 extends in the axial direction X.
  • the current collecting portion 142 has a connection end 142a extending in the second direction Z perpendicular to the axial direction X and the first direction Y.
  • the current collecting portion 142 is connected to the end of the extending portion 141 away from the top cover assembly 12 through the connecting end 142a.
  • the extension portion 141 intersects with the current collecting portion 142.
  • the current collecting portion 142 connected to the extending portion 141 extends in the second direction Z and is connected to the tab 13b, so that the current collecting portion 142 does not occupy too much space of the housing 11 in the axial direction X, which is helpful for reducing the secondary battery 10
  • the number of extensions 141 in this embodiment is more than two.
  • the two or more extensions 141 are arranged at intervals along the second direction Z, and the extensions 141 correspond to the current collectors 142 in one-to-one correspondence.
  • the number of extensions 141 and the number of current collectors 142 are the same.
  • One current collecting member 14 may be connected to the tabs 13b of the plurality of electrode assemblies 13 through more than two current collecting parts 142, so as to improve the overcurrent capability and adaptability of the current collecting member 14.
  • the number of electrode assemblies 13 may be greater than or equal to the number of current collectors 142. When the number of electrode assemblies 13 is larger than the number of current collecting parts 142, the excess tabs 13b can be led out through other current collecting parts 142.
  • connection area between the current collecting portion 142 and the tab 13b since the connection area between the current collecting portion 142 and the tab 13b generates a large amount of heat, when a plurality of current collecting portions 142 and a plurality of tabs 13b are connected, it is advantageous to disperse the current collecting portions 142 and the tab 13b
  • the heat released by the connection area of the heat sink reduces the possibility that when only one current collector 142 is connected to multiple tabs 13b, the heat will be concentrated and the temperature of the connection area between the collector 142 and the tab 13b will rise too high
  • the connection stability of the connection area between the flow portion 142 and the tab 13b The connection stability of the connection area between the flow portion 142 and the tab 13b.
  • the number of extensions 141 and the number of current collectors 142 are the same as the number of electrode assemblies 13, and the extensions 141, the current collectors 142 and the tabs 13 b are provided in one-to-one correspondence.
  • a current collecting member 14 of this embodiment all electrode assemblies 13 can be charged or discharged, thereby helping to reduce the number of components, ensuring a compact internal layout of the secondary battery 10, and improving the energy density of the secondary battery 10 .
  • the current collecting portions 142 are arranged at intervals in the axial direction X, and correspondingly, the respective tabs 13 b extending from the electrode assemblies 13 are also arranged at intervals in the axial direction X. Furthermore, the respective extensions 141 do not overlap in the axial direction X, and the respective tabs 13b do not overlap in the axial direction X.
  • the current collecting portions 142 and the tabs 13b are provided in a one-to-one correspondence, the current collecting portions 142 and the tabs 13b are offset from each other in the axial direction X, which is beneficial to the heat dissipation of each connection area on the one hand, and It is advantageous to perform welding operation on each current collecting part 142 and each tab 13b during the connection process, and the positions of each other do not interfere.
  • the two or more extensions 141 are spaced apart in the second direction Z, and the respective extensions 141 are spaced apart in the axial direction X, when the current collecting parts 142 are welded to the corresponding tabs 13b, The two adjacent current collecting portions 142 or the two adjacent extending portions 141 do not interfere with each other in position, which makes welding impossible or increases welding difficulty.
  • the ends of the two or more extensions 141 are offset from each other in the second direction Z and do not overlap in the axial direction X, while each end is in the axial direction X
  • the distribution is stepwise, so that correspondingly, the two or more current collectors 142 and the two or more tabs 13b are also distributed stepwise in the axial direction X.
  • the projections of the current collecting portion 142 and the corresponding position of the pole lug 13b in the axial direction X at least partially overlap.
  • the projection of the extension portion 141 and the corresponding position of the tab 13b in the axial direction X at least partially overlaps.
  • the extension part 141, the current collecting part 142, and the corresponding pole lugs 13b are successively distributed in the axial direction X. In this way, in the axial direction X, the extending portion 141, the current collecting portion 142, and the pole lugs 13b corresponding to the positions are successively distributed, and at the same time, the space occupation rate of the extending portion 141 and the current collecting portion 142 in the second direction Z can be reduced. It is advantageous to improve the energy density of the secondary battery 10.
  • the current collecting part 142 has a connecting surface 142 b connected and fixed to the tab 13 b, and the surface of the current collecting part 142 away from the extending portion 141 forms the connecting surface 142 b.
  • the tab 13b extends to the area between the current collecting portion 142 and the housing 11 and is connected to the connecting surface 142b of the current collecting portion 142 away from the extending portion 141. In this way, the extension portion 141 does not interfere with the position of the tab 13b. Therefore, the tab 13b does not need to bypass the extension portion 141 and be connected to the current collecting portion 142, which is beneficial to enhance the convenience of connecting the tab 13b and the connection surface 142b.
  • the connecting surface 142 b of each current collecting part 142 faces away from the top cover assembly 12.
  • the current collecting portion 142 has a sheet structure, and the thickness direction of the current collecting portion 142 is parallel to the axial direction X.
  • the current collector 142 extends from the main body toward the housing 11.
  • the tab 13 b can be connected to the surface of the current collecting portion 142 facing away from the top cover assembly 12.
  • the surface of the current collecting part 142 facing away from the top cover assembly 12 and the surface of part of the tabs 13b facing the current collecting part 142 can be substantially in the same plane, to a certain extent, the degree of bending of the tab 13b can be reduced
  • the connection surface 142b of the 142 realizes the connection and fixing, which reduces the possibility that the tab 13b is bent to cause itself to break or tear.
  • the current collecting portion 142 has more space on opposite sides in the axial direction X, it is convenient to use welding equipment to clamp the current collecting portion 142 from opposite sides of the current collecting portion 142, and to The welding connection of the flow part 142 effectively reduces the difficulty of operation in the welding connection process.
  • the current collecting portion 142 has a sheet structure, and the thickness direction of the current collecting portion 142 is parallel to the first direction Y.
  • the current collecting portion 142 is folded with respect to the first direction Y so that the connection surface 142b faces the housing 11 or the electrode assembly 13. After the current collecting part 142 is connected and fixed to the tab 13b, the current collecting part 142 is folded, thereby reducing the size of the current collecting part 142 in the first direction Y, which is beneficial to reduce the current collecting part 142 and the tab 13b
  • the space occupancy rate of the formed connection structure is beneficial to increase the energy density of the secondary battery 10.
  • the connection surface 142 b of the current collecting portion 142 faces the housing 11.
  • the end portion of the tab 13b connected to the connecting surface 142b of the current collecting portion 142 is not separated from the electrode assembly 13 due to the separation of the current collecting portion 142 and the extending portion 141, thereby reducing the folding of the tab 13b The possibility of scratching or puncturing the electrode assembly 13.
  • each group of electrode assemblies 13 includes two electrode units.
  • the two electrode units are stacked in the axial direction X.
  • the electrode unit has a sub-end surface 131c and a sub-tab 131d extending from the sub-end surface 131c.
  • Two sub-end surfaces 131c on the same side form an end surface 13a.
  • Two subpole ears 131d of the same pole are brought together to form the pole ear 13b.
  • the sub-tabs 131d of one electrode unit extend from the region where the sub-end surface 131c is close to the other electrode unit in the axial direction X, so that the sub-tabs 131d of the two electrode units are close to each other and extend a short distance to be collected
  • the tab 13b connected to the current collecting part 142 is fixed.
  • the subpole ear 131d will not cause length redundancy due to its excessive extension length.
  • the extension size of the subpole ear 131d is controlled within a small range, which is beneficial to The space occupation rate of the tab 13b formed by the sub-tabs 131d is reduced, and the energy density of the secondary battery 10 is increased.
  • the electrode unit has two wide faces 131a and two narrow faces 131b connecting the two wide faces 131a, the two wide faces 131a are oppositely arranged along the axial direction X, and the wide faces 131a and the narrow faces 131b are alternately arranged,
  • the tab 13b extends from the area of the end face 13a close to the two wide faces 131a adjacent to the two electrode units, so that in the axial X direction, the tab 13b is approximately in the central area of the end face 13a, ensuring that it is led out from the two electrode units
  • the two sub-pole ears 131d have approximately the same size, which is conducive to the consistency of the manufacturing process of the electrode unit and reduces the manufacturing cost.
  • the ratio of the size of the tab 13b to the size of the end face 13a is 1/10 to 2/5.
  • the tab 13b of this embodiment is easy to be bent and deformed, reducing the possibility of breaking due to a large tensile stress during bending.
  • the number of electrode units is one or two.
  • the sub-pole ears 131d are arranged offset, that is, the sub-pole ears 131d are arranged closer to the other narrow face 131b relative to the one narrow face 131b.
  • the current collecting member 14 further includes a first sheet 143 and a second sheet 144.
  • the first sheet 143 and the second sheet 144 are intersected.
  • the extending portion 141 is connected to the first sheet 143, and the second sheet 144 is used to connect with the pole.
  • the electrode assembly 13 is connected to the pole via the current collecting portion 142, the extending portion 141, the first sheet 143, and the second sheet 144.
  • the thickness direction of the second sheet 144 of this embodiment is the same as the axial direction X.
  • the second sheet 144 has a boss 144 a away from the electrode assembly 13.
  • the second sheet 144 is electrically connected to the pole included in the top cover assembly 12 through the boss 144a.
  • the battery module 20 of the embodiment of the present application includes a plurality of secondary batteries 10 arranged side by side in the same direction.
  • the electrode units included in each secondary battery 10 of the present embodiment are stacked in the axial direction X of the housing hole 11 a of the case 11.
  • the electrode unit of this embodiment expands, it mainly expands and deforms in the axial direction X of the receiving hole 11 a, and the amount of expansion in the arrangement direction of the secondary battery 10 is small. In this way, the cumulative expansion force of each secondary battery 10 in the arrangement direction is small.
  • the battery module 20 does not need to use a structural member with higher strength to restrain the expansion force or use a structural member with a lower strength to restrain the expansion force, thereby effectively reducing the battery module
  • the overall quality of 20 makes the structure of the battery module 20 more compact and effectively improves the energy density of the battery module 20.
  • the battery module 20 itself has little or no expansion in the thickness direction of the secondary battery 10 itself, which can effectively improve the safety of the use process.
  • an embodiment of the present application provides a method for manufacturing a secondary battery 10, which includes:
  • Two or more sets of electrode assemblies 13 are inserted into the receiving hole 11a from the opening.
  • the two or more sets of electrode assemblies 13 are stacked in the axial direction X of the receiving hole 11a.
  • the electrode assembly 13 includes a first direction Y perpendicular to the axial direction X Two oppositely disposed end faces 13a and the tabs 13b extending from each end face 13a;
  • a current collecting member 14 having an extension portion 141 and a current collecting portion 142 is provided, and the current collecting portion 142 of the current collecting member 14 is connected and fixed to the tab 13b so that the extension portion 141 extends in the axial direction X, and the current collecting portion 142 has The connecting end 142a extending in the second direction Z in which the axial direction X is perpendicular to the first direction Y;
  • the top cover assembly 12 and the housing 11 are hermetically connected to cover the opening.
  • the current collecting portion 142 is connected to the end of the extension portion 141 away from the top cover assembly 12 through the connecting end 142a.
  • the secondary battery 10 manufactured using the manufacturing method of the secondary battery 10 of the embodiment of the present application includes a case 11, an electrode assembly 13 provided in the case 11, and a current collector 14.
  • the current collecting member 14 includes an extending portion 141 extending in the axial direction X of the housing hole 11 a of the housing 11 and a current collecting portion 142 intersecting the extending portion 141.
  • the current collecting portion 142 connected to the extending portion 141 extends in the second direction Z and is connected to the tab 13b, so that the current collecting portion 142 does not occupy too much space of the case 11 in the axial direction X, which is beneficial to improve the secondary battery 10 energy density.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种二次电池（10）、电池模组（20）以及二次电池（10）的制造方法，二次电池（10）包括：壳体（11），包括具有开口的容纳孔（11a）；顶盖组件（12），与壳体（11）密封连接以盖闭开口；电极组件（13），设置于容纳孔（11a）内，电极组件（13）包括沿与容纳孔（11a）的轴向（X）相垂直的第一方向（Y）相对设置的两个端面（13a）以及从每个端面（13a）延伸出的极耳（13b），电极组件（13）的数量为两组以上，两组以上的电极组件（13）沿轴向（X）层叠设置；集流件（14），包括延伸部（141）和与极耳（13b）连接固定的集流部（142），延伸部（141）沿轴向（X）延伸，集流部（142）具有沿与轴向（X）和第一方向（Y）相垂直的第二方向（Z）延伸的连接端（142a），集流部（142）通过连接端（142a）连接于延伸部（141）远离顶盖组件（12）的端部。集流件（14）的延伸部（141）和集流部（142）对壳体（11）容纳孔（11a）的轴向（X）上的空间占用率低，有利于提高二次电池（10）能量密度。

Description

二次电池、电池模组以及二次电池的制造方法
相关申请的交叉引用
本申请要求享有于2018年12月29日提交的名称为“二次电池以及电池模组”的中国专利申请201811646492.6的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池技术领域，特别是涉及一种二次电池、电池模组以及二次电池的制造方法。
背景技术
随着科学技术的发展，二次电池在移动电话、数码摄像机和手提电脑等便携式电子设备中得到了广泛使用，并且在电动汽车、电动自行车等电动交通工具及储能设施等大中型电动设备方面有着广泛的应用前景，成为解决能源危机和环境污染等全球性问题的重要技术手段。现有技术中，二次电池包括壳体、设置于壳体内的电极组件以及与电极组件相连接的集流构件。电极组件具有扁平状的本体部以及从本体部延伸出的极耳。现有技术中，集流构件设置于极耳与壳体之间，并且集流构件的连接区域沿壳体容纳孔的轴向延伸，从而集流构件会占用更多的壳体在轴向上的空间，影响二次电池的能量密度。
发明内容
为了解决现有技术中设置于极耳与壳体之间的集流件会过多占用壳体在轴向上的空间的技术问题。
一方面，本申请实施例提出了一种二次电池，包括：壳体，壳体包括具有开口的容纳孔；顶盖组件，顶盖组件与壳体密封连接以盖闭开口；电 极组件，设置于容纳孔内，电极组件包括沿与容纳孔的轴向相垂直的第一方向相对设置的两个端面以及从每个端面延伸出的极耳，电极组件的数量为两组以上，两组以上的电极组件沿轴向层叠设置；集流件，集流件包括延伸部和与极耳连接固定的集流部，延伸部沿轴向延伸，集流部具有沿与轴向和第一方向相垂直的第二方向延伸的连接端，集流部通过连接端连接于延伸部远离顶盖组件的端部。
根据本申请实施例的一个方面，延伸部的数量为两个以上，两个以上的延伸部沿第二方向间隔设置，且延伸部与集流部一一对应设置。
根据本申请实施例的一个方面，延伸部的数量和集流部的数量均与电极组件的数量相同，延伸部、集流部与极耳一一对应设置。
根据本申请实施例的一个方面，各个集流部和各个极耳均沿轴向间隔设置，并且各个延伸部和各个极耳均沿轴向不重叠。
根据本申请实施例的一个方面，集流部和极耳沿轴向的投影至少部分重叠，延伸部和极耳沿轴向的投影至少部分重叠。
根据本申请实施例的一个方面，集流部具有与极耳固定连接的连接面，并且集流部远离延伸部的表面形成连接面。
根据本申请实施例的一个方面，集流部为片状结构，集流部的厚度方向与第一方向平行。
根据本申请实施例的一个方面，集流部为片状结构，集流部的厚度方向与轴向平行。
根据本申请实施例的一个方面，每组电极组件包括两个电极单元，两个电极单元沿轴向层叠设置，电极单元具有子端面和从子端面延伸出的子极耳，两个同侧的子端面形成端面，两个同极的子极耳汇集形成极耳，一个电极单元的子极耳在轴向上从子端面靠近另一个电极单元的区域延伸出。
根据本申请实施例的一个方面，电极单元具有两个宽面和连接两个宽面的两个窄面，两个宽面沿轴向相对设置，宽面和窄面交替设置，极耳从端面靠近两个电极单元相邻的两个宽面的区域延伸出。
根据本申请实施例的一个方面，子极耳相对于一个窄面更靠近另一个 窄面设置。
根据本申请实施例提供的二次电池，其包括壳体、设置于壳体内的电极组件以及集流件。集流件包括沿壳体的容纳孔的轴向延伸的延伸部以及与延伸部相交的集流部。连接于延伸部的集流部沿第二方向延伸并且与极耳相连接，从而集流部不会过多占用壳体沿轴向的空间，有利于提高二次电池的能量密度。
另一个方面，根据本申请实施例提供一种电池模组，包括两个以上的如上述实施例的二次电池，两个以上的二次电池并排设置。
再一个方面，根据本申请实施例提供一种二次电池的制造方法，其中，包括：
提供具有容纳孔的壳体，容纳孔具有开口；
将两组以上的电极组件从开口装入容纳孔，两组以上的电极组件沿容纳孔的轴向层叠设置，电极组件包括沿与轴向相垂直的第一方向相对设置的两个端面以及从每个端面延伸出的极耳；
提供具有集流部和延伸部的集流件，将集流件的集流部与极耳连接固定，使延伸部沿轴向延伸，集流部具有沿与轴向和第一方向相垂直的第二方向延伸的连接端；
将顶盖组件与壳体密封连接以盖闭开口，集流部通过连接端连接于延伸部远离顶盖组件的端部。
附图说明
下面将通过参考附图来描述本申请示例性实施例的特征、优点和技术效果。
图1是本申请一实施例的电池模组的结构示意图；
图2是本申请一实施例的二次电池的结构示意图；
图3是本申请一实施例的二次电池的分解结构示意图；
图4是本申请一实施例的电极单元的结构示意图；
图5是本申请一实施例的电极单元的剖视结构示意图；
图6是本申请一实施例的集流件的结构示意图；
图7是本申请又一实施例的集流件的结构示意图；
图8是本申请又一实施例的二次电池的分解结构示意图；
图9是本申请另一实施例的二次电池的分解结构示意图；
图10是图9中A处的放大图；
图11是本申请另一实施例的集流件的结构示意图；
图12是本申请一实施例的一种二次电池的制造方法的流程示意图。
在附图中，附图并未按照实际的比例绘制。
标记说明：
10、二次电池；
11、壳体；11a、容纳孔；
12、顶盖组件；121、顶盖板；122、极柱；
13、电极组件；13a、端面；13b、极耳；
131、电极单元；131a、宽面；131b、窄面；131c、子端面；131d、子极耳；
14、集流件；141、延伸部；142、集流部；142a、连接端；142b、连接面；143、第一片材；144、第二片材；144a、凸台；
X、轴向；Y、第一方向；Z、第二方向；
20、电池模组。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个或两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性。
在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
为了更好地理解本申请，下面结合图1至图11对本申请实施例的电池模组20和二次电池10进行详细描述。
参见图1所示，本申请实施例提供一种电池模组20，其包括：两个以上的本实施例的二次电池10以及用于连接两个二次电池10的汇流排。两个以上的二次电池10沿同一方向并排设置。汇流排的一端与两个二次电池10中的一个二次电池10连接固定，另一端与另一个二次电池10连接固定。本实施例的两个以上的二次电池10能够沿自身厚度方向并排设置以形成电池模组20。
参见图2和图3所示，本申请实施例的二次电池10包括壳体11、设置于壳体11内的电极组件13以及与壳体11密封连接的顶盖组件12。
本实施例的壳体11可以是四棱柱体形状或其他形状。壳体11包括具有开口的容纳孔11a。容纳孔11a用于容纳电极组件13和电解液。壳体11可以由例如铝、铝合金或塑料等材料制造。
本申请实施例的电极组件13包括沿与容纳孔11a的轴向X相垂直的第一方向Y相对的两个端面13a以及从每个端面13a延伸出的极耳13b。其中，本实施例的容纳孔11a的轴向X与容纳孔11a自身延伸方向平行。本实施例中，电极组件13的每个端面13a上延伸出一个极耳13b。每个电极组件13具有沿第一方向Y相对的两个极耳13b，其中一个极耳13b作为正极耳，另一个作为负极耳。
参见图4和图5所示，本实施例的电极组件13包括一个或两个以上的沿容纳孔11a的轴向X层叠设置的电极单元131。电极单元131具有子端面131c和从子端面131c延伸出的子极耳131d。本实施例的电极单元131可通过将第一极片、第二极片以及隔膜一同堆叠或者卷绕而形成本体以及与本体相连接的子极耳131d。隔膜是介于第一极片和第二极片之间的 绝缘体。本实施例的电极单元131包括一层隔膜、一层第一极片，一层隔膜和一层第二极片。在本实施例中，示例性地以第一极片为正极片，第二极片为负极片进行说明。同样地，在其他的实施例中，第一极片还可以为负极片，而第二极片为正极片。另外，正极活性物质被涂覆在正极片的涂覆区上，而负极活性物质被涂覆到负极片的涂覆区上。从本体延伸出的多个未涂覆区则作为子极耳131d。一个电极单元131包括沿第一方向Y相对设置的两个子极耳131d，即正极耳和负极耳。正极耳从正极片的涂覆区延伸出；负极耳从负极片的涂覆区延伸出。第一方向Y垂直于轴向X，这里的垂直并不仅限于数学意义上的严格垂直定义。每个电极组件13的端面13a包括各个电极单元131的子端面131c，也即所有的电极单元131的所有子端面131c共同形成端面13a。一组电极组件13的极耳13b包括各个电极单元131的子极耳131d，也即所有电极单元131的所有子极耳131d共同形成极耳13b。在一个实施例中，参见图4所示，电极单元131为扁平状结构，其具有两个宽面131a和连接两个宽面131a的两个窄面131b。两个宽面131a沿轴向X相对设置。宽面131a和窄面131b交替设置。
本实施例的顶盖组件12与壳体11密封连接以盖闭开口。在一个实施例中，顶盖组件12包括顶盖板121和极柱122。顶盖组件12通过顶盖板121密封连接于壳体11。极柱122设置于顶盖板121并且与电极组件13通过集流件14电连接。
参见图3所示，本申请实施例的二次电池10包括两组以上的电极组件13。两组以上的电极组件13沿轴向X层叠设置。集流件14包括延伸部141和与极耳13b连接固定的集流部142。延伸部141沿轴向X延伸。集流部142具有沿与轴向X和第一方向Y相垂直的第二方向Z延伸的连接端142a。集流部142通过连接端142a连接于延伸部141远离顶盖组件12的端部。延伸部141与集流部142相交设置。连接于延伸部141的集流部142沿第二方向Z延伸并且与极耳13b相连接，从而集流部142不会过多占用壳体11沿轴向X的空间，有利于缩小二次电池10在轴向X上的尺寸或增大电极组件13在轴向X上的尺寸，以此提高二次电池10的能量密度。
参见图6和图7所示，本实施例的延伸部141的数量为两个以上。两个以上的延伸部141沿第二方向Z间隔设置，并且延伸部141与集流部142一一对应设置。延伸部141的数量和集流部142的数量相同。一个集流件14可以通过两个以上的集流部142连接于多个电极组件13的极耳13b，提升集流件14的过流能力以及适应能力。电极组件13的数量可以大于或等于集流部142的数量。电极组件13大于集流部142的数量时，多余的极耳13b可以通过其它的集流部142件引出。另外，由于集流部142与极耳13b的连接区域会产生大量的热量，因此设置多个集流部142和多个极耳13b相连接时，有利于分散各个集流部142与极耳13b的连接区域所释放的热量，降低仅适用一个集流部142连接多个极耳13b时，热量发生集聚而导致集流部142与极耳13b的连接区域温升过高的可能性，保证集流部142与极耳13b的连接区域的连接稳定性。
在一个实施例中，参见图8所示，延伸部141的数量和集流部142的数量均与电极组件13的数量相同，延伸部141、集流部142与极耳13b一一对应设置。通过使用一个本实施例的集流件14就能够实现所有电极组件13的充电或放电，从而有利于减少零部件数量，保证二次电池10内部布局紧凑，有利于提高二次电池10的能量密度。
在一个实施例中，参见图6所示，各个集流部142沿轴向X间隔设置，相对应地，从各组电极组件13延伸出的各个极耳13b也沿轴向X间隔设置。并且，各个延伸部141沿轴向X不重叠，而各个极耳13b沿轴向X也不重叠。这样，由于集流部142和极耳13b一一对应设置，因此各个集流部142和各个极耳13b均在轴向X上相互错开，一方面有利于各个连接区域的散热，另一方面有利于在连接过程中对各个集流部142和各个极耳13b进行焊接操作，彼此位置不干涉。由于两个以上的延伸部141在第二方向Z上间隔设置，同时各个延伸部141在轴向X上间隔设置，因此在各个集流部142与相对应的各个极耳13b进行焊接操作时，相邻两个集流部142或相邻两个延伸部141彼此之间不会出现位置干涉而导致无法焊接或增加焊接难度。可选地，参见图6和图7所示，两个以上的延伸部141的端部在第二方向Z上彼此错开且在轴向X上不重叠，同时各个端部在轴 向X上呈阶梯式分布，从而相对应地，两个以上的集流部142以及两个以上的极耳13b在轴向X上也呈阶梯式分布。
在一个实施例中，集流部142以及位置相对应的极耳13b沿轴向X的投影至少部分地重叠。延伸部141和位置相对应的极耳13b沿轴向X的投影至少部分地重叠。延伸部141、集流部142以及位置相对应的极耳13b三者在轴向X上相继分布。这样，在轴向X上，延伸部141、集流部142以及位置相对应的极耳13b相继分布，同时能够降低延伸部141和集流部142在第二方向Z上的空间占用率，有利于提高二次电池10的能量密度。
在一个实施例中，集流部142具有与极耳13b连接固定的连接面142b，并且集流部142远离延伸部141的表面形成连接面142b。极耳13b延伸至集流部142和壳体11之间的区域并与集流部142远离延伸部141的连接面142b相连接。这样，延伸部141不会对极耳13b形成位置干涉，因此极耳13b不需要绕过延伸部141再与集流部142相连接，有利于提升极耳13b与连接面142b连接便利性。两个以上的集流部142中，各个集流部142的连接面142b均背向顶盖组件12。
可选地，参见图6和图8所示，集流部142为片状结构，并且集流部142的厚度方向与轴向X平行。集流部142从主体部上朝向壳体11延伸。在一个示例中，极耳13b能够与集流部142背向顶盖组件12的表面相连接。集流部142背向顶盖组件12的表面和部分极耳13b朝向集流部142的表面能够基本处于同一平面，在一定程度上，可以减小极耳13b弯折程度即可与集流部142的连接面142b实现连接固定，降低极耳13b折弯而导致自身断裂或撕裂的可能性。同时，由于集流部142在轴向X上的相对两侧具有更大的空间，因此便于使用焊接设备从集流部142的相对两侧夹住集流部142，并对极耳13b和集流部142焊接连接，有效降低焊接连接过程操作难度。
可选地，参见图9至图11所示，集流部142为片状结构，并且集流部142的厚度方向与第一方向Y平行。集流部142相对于第一方向Y翻折，使得连接面142b朝向壳体11或朝向电极组件13。在集流部142与极耳13b连接固定后，将集流部142进行翻折操作，从而减小集流部142在 第一方向Y上的尺寸，有利于降低集流部142和极耳13b形成的连接结构的空间占用率，有利于提高二次电池10的能量密度。优选地，集流部142的连接面142b朝向壳体11。与集流部142的连接面142b相连接后的极耳13b端部因受到集流部142和延伸部141的隔离，不会与电极组件13发生接触，从而降低翻折后的极耳13b不会刮伤或刺破电极组件13的可能性。
在一个实施例中，参见图9所示，每组电极组件13包括两个电极单元。两个电极单元沿轴向X层叠设置。电极单元具有子端面131c和从子端面131c延伸出的子极耳131d。两个同侧的子端面131c形成端面13a。两个同极的子极耳131d汇集形成极耳13b。一个电极单元的子极耳131d在轴向X上从子端面131c靠近另一个电极单元的区域延伸出，从而两个电极单元各自的子极耳131d相互靠近并且延伸出较短的距离即可汇集成与集流部142连接固定的极耳13b。这样，一方面，子极耳131d不会由于自身延伸长度过长而导致出现长度冗余的情况。子极耳131d出现冗余情况时，容易导致子极耳131d折弯时出现应力集中区域而发生断裂的情况，另一方面，子极耳131d的延伸尺寸控制在较小的范围内，有利于降低子极耳131d汇集形成的极耳13b空间占用率，提高二次电池10的能量密度。
在一个实施例中，电极单元具有两个宽面131a和连接两个宽面131a的两个窄面131b，两个宽面131a沿轴向X相对设置，宽面131a和窄面131b交替设置，极耳13b从端面13a靠近两个电极单元相邻的两个宽面131a的区域延伸出，从而在轴向X方向上，极耳13b大致处于端面13a的中央区域，保证从两个电极单元引出的两个子极耳131d的尺寸大致相同，有利于电极单元加工制造工序一致性，降低加工制造成本。在一个实施例中，在第二方向Z上，极耳13b的尺寸与端面13a的尺寸的比值为1/10至2/5。本实施例的极耳13b易于折弯变形，降低在折弯过程中因受到较大拉伸应力而发生断裂的可能性。在一个实施例中，电极单元的数量为一个或两个。子极耳131d偏置设置，也即子极耳131d相对于一个窄面131b更靠近另一个窄面131b设置。
在一个实施例中，参见图6或图11所示，集流件14还包括第一片材143和第二片材144。第一片材143和第二片材144相交设置。延伸部141连接于第一片材143，而第二片材144用于与极柱相连接。本实施例中，电极组件13通过集流部142、延伸部141、第一片材143以及第二片材144与极柱相连接。本实施例的第二片材144的厚度方向与轴向X相同。第二片材144具有远离电极组件13的凸台144a。第二片材144通过凸台144a与顶盖组件12所包括的极柱电连接。
本申请实施例的电池模组20包括多个沿同一方向并排设置的二次电池10。由于本实施例的各个二次电池10所包括的电极单元沿壳体11的容纳孔11a的轴向X层叠设置。本实施例的电极单元发生膨胀时，主要沿容纳孔11a的轴向X膨胀变形，而在二次电池10的排列方向上的膨胀量较小。这样，各个二次电池10在排列方向上累积的膨胀合力较小。在二次电池10的排列方向上，电池模组20不需要使用具有较高强度的结构件来约束抵消膨胀力或使用较低强度的结构件即可约束抵消膨胀力，从而有效降低电池模组20的整体质量，使得电池模组20自身结构更加紧凑，有效提升电池模组20的能量密度。同时，电池模组20自身在二次电池10自身厚度方向上膨胀量较小或无膨胀量，能够有效提升使用过程安全性。
参见图12所示，本申请实施例提供一种二次电池10的制造方法，其中，包括：
提供具有容纳孔11a的壳体11，容纳孔11a具有开口；
将两组以上的电极组件13从开口装入容纳孔11a，两组以上的电极组件13沿容纳孔11a的轴向X层叠设置，电极组件13包括沿与轴向X相垂直的第一方向Y相对设置的两个端面13a以及从每个端面13a延伸出的极耳13b；
提供具有延伸部141和集流部142的集流件14，将集流件14的集流部142与极耳13b连接固定，使延伸部141沿轴向X延伸，集流部142具有沿与轴向X和第一方向Y相垂直的第二方向Z延伸的连接端142a；
将顶盖组件12与壳体11密封连接以盖闭开口，集流部142通过连接端142a连接于延伸部141远离顶盖组件12的端部。
使用本申请实施例的二次电池10制造方法制造的二次电池10包括壳体11、设置于壳体11内的电极组件13以及集流件14。集流件14包括沿壳体11的容纳孔11a的轴向X延伸的延伸部141以及与延伸部141相交的集流部142。连接于延伸部141的集流部142沿第二方向Z延伸并且与极耳13b相连接，从而集流部142不会过多占用壳体11沿轴向X的空间，有利于提高二次电池10的能量密度。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (13)

  1. 一种二次电池，其中，包括：
    壳体，所述壳体包括具有开口的容纳孔；
    顶盖组件，所述顶盖组件与所述壳体密封连接以盖闭所述开口；
    电极组件，设置于所述容纳孔内，所述电极组件包括沿与所述容纳孔的轴向相垂直的第一方向相对设置的两个端面以及从每个所述端面延伸出的极耳，所述电极组件的数量为两组以上，两组以上的所述电极组件沿所述轴向层叠设置；
    集流件，所述集流件包括延伸部和与所述极耳连接固定的集流部，所述延伸部沿所述轴向延伸，所述集流部具有沿与所述轴向和所述第一方向相垂直的第二方向延伸的连接端，所述集流部通过所述连接端连接于所述延伸部远离所述顶盖组件的端部。
  2. 根据权利要求1所述的二次电池，其中，所述延伸部的数量为两个以上，两个以上的所述延伸部沿所述第二方向间隔设置，且所述延伸部与所述集流部一一对应设置。
  3. 根据权利要求2所述的二次电池，其中，所述延伸部的数量和所述集流部的数量均与所述电极组件的数量相同，所述延伸部、所述集流部与所述极耳一一对应设置。
  4. 根据权利要求3所述的二次电池，其中，各个所述集流部和各个所述极耳均沿所述轴向间隔设置，并且各个所述延伸部和各个所述极耳均沿所述轴向不重叠。
  5. 根据权利要求1所述的二次电池，其中，所述集流部和所述极耳沿所述轴向的投影至少部分重叠，所述延伸部和所述极耳沿所述轴向的投影至少部分重叠。
  6. 根据权利要求1所述的二次电池，其中，所述集流部具有与所述极耳固定连接的连接面，并且所述集流部远离所述延伸部的表面形成所述连接面。
  7. 根据权利要求1所述的二次电池，其中，所述集流部为片状结构， 所述集流部的厚度方向与所述第一方向平行。
  8. 根据权利要求1所述的二次电池，其中，所述集流部为片状结构，所述集流部的厚度方向与所述轴向平行。
  9. 根据权利要求1所述的二次电池，其中，每组所述电极组件包括两个所述电极单元，两个所述电极单元沿所述轴向层叠设置，所述电极单元具有子端面和从所述子端面延伸出的子极耳，两个同侧的所述子端面形成所述端面，两个同极的所述子极耳汇集形成所述极耳，一个所述电极单元的所述子极耳在所述轴向上从所述子端面靠近另一个所述电极单元的区域延伸出。
  10. 根据权利要求9所述的二次电池，其中，所述电极单元具有两个宽面和连接两个所述宽面的两个窄面，两个所述宽面沿所述轴向相对设置，所述宽面和所述窄面交替设置，所述极耳从所述端面靠近两个所述电极单元相邻的两个所述宽面的区域延伸出。
  11. 根据权利要求10所述的二次电池，其中，所述子极耳相对于一个所述窄面更靠近另一个所述窄面设置。
  12. 一种电池模组，包括两个以上的如权利要求1至11任一项所述的二次电池，两个以上的所述二次电池并排设置。
  13. 一种二次电池的制造方法，其中，包括：
    提供具有容纳孔的壳体，所述容纳孔具有开口；
    将两组以上的电极组件从所述开口装入所述容纳孔，两组以上的所述电极组件沿所述容纳孔的轴向层叠设置，所述电极组件包括沿与所述轴向相垂直的第一方向相对设置的两个端面以及从每个所述端面延伸出的极耳；
    提供具有集流部和延伸部的集流件，将集流件的集流部与所述极耳连接固定，使所述延伸部沿所述轴向延伸，所述集流部具有沿与所述轴向和所述第一方向相垂直的第二方向延伸的连接端；
    将顶盖组件与所述壳体密封连接以盖闭所述开口，所述集流部通过所述连接端连接于所述延伸部远离所述顶盖组件的端部。
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