WO2020133673A1 - 二次电池以及电池模组 - Google Patents

二次电池以及电池模组 Download PDF

Info

Publication number
WO2020133673A1
WO2020133673A1 PCT/CN2019/076266 CN2019076266W WO2020133673A1 WO 2020133673 A1 WO2020133673 A1 WO 2020133673A1 CN 2019076266 W CN2019076266 W CN 2019076266W WO 2020133673 A1 WO2020133673 A1 WO 2020133673A1
Authority
WO
WIPO (PCT)
Prior art keywords
current collecting
piece
axial direction
sheet
tab
Prior art date
Application number
PCT/CN2019/076266
Other languages
English (en)
French (fr)
Inventor
陈宁
金海族
史东洋
李振华
胡飞
陈元宝
Original Assignee
宁德时代新能源科技股份有限公司
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 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to EP19848926.2A priority Critical patent/EP3907783A4/en
Publication of WO2020133673A1 publication Critical patent/WO2020133673A1/zh
Priority to US17/362,960 priority patent/US20210328293A1/en

Links

Images

Classifications

    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
    • 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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • 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
    • 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
    • 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
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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 secondary battery and a battery module.
  • Embodiments of the present application provide a secondary battery and a battery module.
  • the tab included in the secondary battery can be connected to the first current collecting plate without bending, so as to avoid the situation that the tab is broken due to excessive tensile stress due to bending.
  • a secondary battery including:
  • the housing includes an accommodating hole with an opening; a top cover assembly, the top cover assembly is sealedly connected to the housing to cover the opening; an electrode assembly is disposed in the accommodating hole, and the electrode assembly includes an axis perpendicular to the accommodating hole
  • the electrode assembly includes more than two electrode units, and the more than two electrode units are stacked in the axial direction
  • the current collecting unit includes the first Sheet material and a first current collecting plate connected to the first sheet material, the first sheet material extends in the axial direction, the tab extends in the first direction and is connected to the first current collecting plate, the pole ear is connected to the first current collecting plate
  • the connected portion and the first current collecting plate are stacked in the axial direction.
  • a secondary battery provided by an embodiment of the present application, it includes a case, an electrode assembly provided in the case, a top cover assembly sealing the case, and a current collecting unit for connecting the top cover assembly and the electrode assembly.
  • the current collecting unit includes a first sheet and a first current collecting sheet connected to the first sheet.
  • the tab of the electrode assembly is connected to the first current collecting piece.
  • the tabs of the electrode assembly extend from the end surface along a straight line in a first direction, and are connected to the first current collecting piece.
  • the part where the tab is connected to the first current collecting plate is stacked on the first current collecting plate in the axial direction. Since the pole lug extends from the end face and can be connected to the first current collecting piece without bending operation, the overall pole lug will not break itself due to excessive tensile stress caused by bending, effectively improving the second The yield of secondary batteries.
  • 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.
  • 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 diagram of an exploded structure of a secondary battery according to another embodiment of the present application.
  • FIG. 7 is a schematic structural view of the current collecting unit in the embodiment of FIG. 6;
  • 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 yet another embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of the current collecting unit in the embodiment of FIG. 9.
  • 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 sealedly connected to the case 11.
  • the housing 11 of this embodiment may have a quadrangular prism shape or other shapes.
  • the housing 11 has an open receiving hole 11a.
  • 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 of the receiving hole 11a X is parallel to the extending direction of the receiving hole 11a.
  • 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 two or more electrode units 131 stacked in the axial direction X of the receiving hole 11 a.
  • 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.
  • the uncoated area extending from the body serves as a sub-ear.
  • the electrode unit 131 includes two sub-end surfaces 131c and two sub-tabs 131d oppositely arranged along the first direction Y.
  • the two sub-polar ears are the positive and negative ears, respectively.
  • 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 a sub-end surface 131c of each electrode unit 131, and the tab 13b of each electrode assembly 13 includes a sub-tab 131d of each electrode unit 131.
  • the electrode unit 131 has a flat structure, which has two wide faces 131a and two narrow faces 131b connecting the two wide faces 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 provided on the top cover plate 121 and electrically connected to the electrode assembly 13 through the current collecting unit 14.
  • the current collecting unit 14 of the embodiment of the present application is used to connect the electrode assembly 13 and the pole 122 of the top cover assembly 12.
  • the current collecting unit 14 includes a first sheet 141 and a first current collecting sheet 142 connected to the first sheet 141.
  • the first sheet 141 extends in the axial direction X.
  • the tab 13b extends along the first direction Y and is connected to the first current collecting piece 142.
  • the portion where the tab 13b is connected to the first current collecting piece 142 is stacked on the first current collecting piece 142 in the axial direction X.
  • the surface of the first current collecting plate 142 for connecting to the tab 13b and the surface of the first current collecting plate 142 for connecting to the first tab 142 are substantially at the same horizontal plane, so that the tab 13b is separated from the electrode After the end surface 13a of the assembly 13 is directly extended, the surface for connecting with the first current collecting plate 142 may be directly connected with the first current collecting plate 142. In this way, there is no need to bend the tab 13b and then connect the bent free end to the first current collecting plate 142, thereby avoiding the tab 13b from being subjected to excessive tensile stress due to bending. Cracks or cracks occur, thereby reducing the failure rate of the electrode assembly 13 due to the damage of the tab 13b, improving the yield of the secondary battery 10, and effectively reducing production costs.
  • the first current collecting piece 142 of the embodiment of the present application has a first connecting end 142 a connected to the first sheet 141.
  • the first connection end 142a extends in a second direction Z perpendicular to the axial direction X and the first direction Y.
  • the thickness direction of the first current collecting piece 142 is the same as the axial direction X. In this way, the areas of the two surfaces of the first current collecting plate 142 opposed in the axial direction X are relatively large, so that the connection state after the tab 13b is connected to one of the two surfaces is more stable and reliable.
  • the first current collecting piece 142 of the embodiment of the present application is located on the side of the first sheet 141 close to the casing 11.
  • the tab 13b is connected to the surface of the first current collecting plate 142 facing or facing away from the top cover assembly 12. In this way, the first current collecting plate 142 is far away from the electrode assembly 13, and sufficient enough space can be reserved on opposite sides in the axial direction X.
  • the ultrasonic device it is convenient for the ultrasonic device to sandwich the first current collecting plate 142 from both sides of the first current collecting plate 142 in the axial direction X, thereby facilitating the ultrasonic welding operation.
  • the current collecting unit 14 of the embodiment of the present application further includes a second current collecting piece 143 connected to the first sheet 141.
  • the first current collecting piece 142 and the second current collecting piece 143 are both located on the side of the first sheet 141 close to the housing 11.
  • the first current collecting piece 142 and the second current collecting piece 143 are located on the same side of the first sheet 141.
  • the first current collecting piece 142 and the second current collecting piece 143 are separated by a predetermined distance in the second thickness direction to form a concession space therebetween.
  • the first current collecting piece 142 and the second current collecting piece 143 are each connected to the tab 13b by ultrasonic welding, it is convenient for the ultrasonic device to be clamped from both sides of the one current collecting piece or the second current collecting piece 143 along the second thickness direction
  • the first current collecting plate 142 or the second current collecting plate 143 facilitates the ultrasonic welding operation.
  • the number of electrode assemblies 13 is two groups. The two sets of electrode assemblies 13 are stacked in the axial direction X.
  • the tabs 13b of one group of electrode assemblies 13 are electrically connected to the first current collector 142, and the tabs 13b of the other group of electrode assemblies 13 are electrically connected to the second current collector 143.
  • the portion where the tab 13 b is connected to the second current collecting piece 143 and the second current collecting piece 143 are stacked in the axial direction X. In this way, it is not necessary to perform a bending operation on the tab 13b of the electrode assembly 13 and then connect the bent free end to the second current collecting piece 143, thereby avoiding the tab 13b from being too large due to bending.
  • the tensile stress causes breakage or cracks, thereby reducing the failure rate of the electrode assembly 13 due to the failure of the tab 13b.
  • the first sheet 141 of the embodiment of the present application includes a main body portion 141 a extending in the axial direction X and an extension portion 141 b connected to the main body portion 141 a.
  • the extension portion 141b extends outward of the main body portion 141a in a second direction Z perpendicular to the axial direction X and the first direction Y.
  • the first current collecting piece 142 and the second current collecting piece 143 are respectively connected to both ends of the extension portion 141b in the axial direction X.
  • the size of the extended tab 13b does not need to be too long to be connected to the first current collecting piece 142 or the second The current collecting pieces 143 are connected and fixed, thus effectively shortening the extended length of the tab 13b, which is beneficial to reduce the space occupation rate of the tab 13b, increase the energy density of the secondary battery 10, and also effectively reduce the processing cost.
  • the first current collecting plate 142 is close to the top cover assembly 12 relative to the second current collecting plate 143, and the tabs 13 b of the electrode assembly 13 are connected to the surface of the first current collecting plate 142 facing the top cover assembly 12 , The tab 13b of the other electrode assembly 13 is connected to the surface of the second current collecting piece 143 facing away from the top cover assembly 12, so that the first current collecting piece 142 and the second current collecting piece 143 are located between the two tabs 13b .
  • the first current collecting piece 142 and the second current collecting piece 143 are soldered and connected to their corresponding tabs 13b, on the other hand, the first current collecting piece 142, the second current collecting piece 143 and two
  • the maximum dimension of the tab 13b in the axial direction X is beneficial to reduce the space occupation rate of the first current collecting plate 142, the second current collecting tab 143 and the two tabs 13b in the axial direction X, and improve the energy of the secondary battery 10 density.
  • the first current collecting plate 142 and the second current collecting plate 143 are at least partially overlapped along the axial direction X, which is beneficial to reduce the first current collecting plate 142 and the second current collecting plate 143 in the second direction Z On the space occupancy rate.
  • the first current collecting piece 142 and the second current collecting piece 143 have the same structure, and the first current collecting piece 142 and the second current collecting piece 143 are arranged in alignment along the axial direction X.
  • the current collecting unit 14 further includes a first connecting piece 144 connected to the first sheet 141.
  • the first connection piece 144 extends in the axial direction X and the thickness direction of the first connection piece 144 is parallel to the second direction Z.
  • the first current collecting piece 142 is connected to the first sheet 141 through the first connecting piece 144.
  • the first current collecting piece 142 extends in the second direction Z, and the first current collecting piece 142 intersects the first connection piece 144.
  • the tab 13b may be connected to the surface of the first current collecting plate 142 facing or facing away from the top cover assembly 12.
  • the first connecting piece 144 is located on the side of the tab 13b, so that the first connecting piece 144 may not protrude from the tab 13b in the first direction Y, which is beneficial to reduce the Space occupancy rate increases the energy density of the secondary battery 10.
  • the first current collecting piece 142 overlaps with the tab 13b in the axial direction X, so that the first current collecting piece may not protrude from the tab 13b in the first direction Y, which further helps to reduce the first current collecting piece 142 Space occupancy rate increases the energy density of the secondary battery 10.
  • the first current collecting piece 142 has a first connecting end 142a connected to the first connecting piece 144, and the first connecting end 142a extends in the first direction Y.
  • the thickness direction of the first current collecting piece 142 is the same as the axial direction X.
  • the first current collecting plate 142 is far away from the electrode assembly 13 and can reserve enough space for the opposite sides in the axial direction X.
  • the current collecting unit 14 further includes a first connecting piece 144 and a second connecting piece 145 connected to the first sheet 141.
  • the first connection piece 144 and the second connection piece 145 are arranged at intervals in the second direction Z and both extend in the axial direction X.
  • the first current collecting piece 142 is connected to the first sheet 141 through the first connecting piece 144.
  • the second current collecting piece 143 is connected to the first sheet 141 through the second connecting piece 145.
  • the first current collecting piece 142 and the second current collecting piece 143 both extend along the second direction Z, and the first current collecting piece 142 and the second current collecting piece 143 are respectively connected to the first connecting piece 144 and the first A connecting piece 144 intersects.
  • the tab 13b may be connected to the surfaces of the first and second current collecting plates 142 and 143 facing or facing away from the top cover assembly 12. In the second direction Z, both the first connection piece 144 and the second connection piece 145 are located on the side of the tab 13b, so that the first connection piece 144 and the second connection piece 145 may not protrude in the first direction Y
  • the tabs 13b corresponding to each of them are helpful to reduce the space occupancy rate of the first connection piece 144 and the second connection piece 145 and increase the energy density of the secondary battery 10.
  • the first current collecting piece 142 and the second current collecting piece 143 both overlap with the corresponding tabs 13b in the axial direction X, so that the first current collecting piece and the second current collecting piece 143 can also be both in the first direction Y Not protruding out of the respective corresponding tabs 13b further contributes to reducing the space occupancy rate of the first current collecting piece 142 and the second current collecting piece 143 and improving the energy density of the secondary battery 10.
  • the first current collecting plate 142 is close to the top cover assembly 12 relative to the second current collecting plate 143, and the tabs 13b of a group of electrode assemblies 13 are connected to the first current collecting plate 142 toward or away from the top cover assembly 12, the tab 13 b of another group of electrode assemblies 13 is connected to the surface of the second current collecting piece 143 facing or facing away from the top cover assembly 12.
  • the first current collecting piece 142 of the embodiment of the present application has a first connecting end 142 a connected to the first sheet 141.
  • the second current collecting piece 143 has a second connection end 143 a connected to the first sheet 141. Both the first connection end 142a and the second connection end 143a extend in the first direction Y.
  • the thickness directions of the first current collecting piece 142 and the second current collecting piece 143 are the same as the axial direction X.
  • the first current collecting piece 142 and the second current collecting piece 143 are both rectangular structures, and their respective length directions are the same as the second direction Z.
  • the number of electrode assemblies 13 is two groups.
  • the two sets of electrode assemblies 13 are stacked in the axial direction X.
  • Each group of electrode assemblies 13 includes two electrode units 131.
  • the electrode unit 131 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 131 extend from the region of the sub-end surface 131c close to the other electrode unit 131 in the axial direction X, so that the sub-tabs 131d of the two electrode units 131 are close to each other and extend a short distance That is, the tab 13b connected and fixed to the first current collecting piece 142 and the second current collecting piece 143 can be assembled.
  • 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 reduce
  • the tabs 13b formed by the collection of the sub-tabs 131d occupy the space ratio and increase the energy density of the secondary battery 10.
  • the electrode unit 131 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 .
  • each electrode assembly 13 includes two electrode units 131.
  • 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 131, so that in the axial X direction, the tab 13b is approximately in the center area of the end face 13a, ensuring that the two electrode units
  • the dimensions of the two sub-tabs 131d led out by 131 are approximately the same, which is conducive to the uniformity of the manufacturing process of the electrode unit 131 and reduces the manufacturing cost.
  • the current collecting unit further includes a second sheet 146 connected to the first sheet 141.
  • the thickness direction of the second sheet 146 of this embodiment is the same as the axial direction X.
  • the second sheet 146 has a boss 146a away from the electrode assembly 13.
  • the second sheet 146 is electrically connected to the pole 122 included in the top cover assembly 12 through the boss 146a.
  • the number of current collecting units 14 is two.
  • the top cover plate 121 is provided with two poles 122, and the two current collecting units 14 are respectively connected to the two poles 122.
  • the two current collecting units 14 are spaced apart in the first direction Y.
  • the electrode assembly 13 is disposed between the two current collecting units 14.
  • the body of the electrode unit 131 included in the electrode assembly 13 is between the two current collecting units 14, and the two tabs 13 b included in the electrode assembly 13 respectively correspond to the two current collecting units 14.
  • One tab 13b is connected to one current collecting unit 14, and the other tab 13b is connected to another current collecting unit 14.
  • each of the two current collecting units 14 is electrically connected to the corresponding tab 13b through the first current collecting piece 142.
  • 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. Since the electrode units 131 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. When the electrode unit 131 of this embodiment expands, it mainly expands and deforms in the axial direction X of the receiving hole 11a, 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 amount of expansion of the battery module 20 itself in the thickness direction of the secondary battery 10 is small, which can effectively improve the safety during use.

Landscapes

  • 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

本申请涉及一种二次电池以及电池模组。二次电池包括：壳体，包括具有开口的容纳孔；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的两个端面以及从端面延伸出的极耳，电极组件包括两个以上的电极单元，两个以上的电极单元沿轴向层叠设置；集流单元，集流单元包括第一片材和连接于第一片材的第一集流片，第一片材沿轴向延伸，极耳沿第一方向延伸并且连接于第一集流片，极耳与第一集流片相连接的部分与第一集流片在轴向上层叠设置。本申请的二次电池所包括的极耳不需要弯折即可与第一集流片相连接，从而避免极耳因弯折而导致自身受到过大拉伸应力发生断裂的情况。

Description

二次电池以及电池模组
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201811646743.0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以及电池模组。
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，二次电池的极耳需要沿与自身延伸方向相交的方向弯折然后再与集流件相连接。由于极耳在折弯后会受到拉伸应力的作用，因此容易出现断裂的现象，严重影响二次电池的成品率。
发明内容
本申请实施例提供一种二次电池以及电池模组。二次电池所包括的极耳不需要弯折即可与第一集流片相连接，从而避免极耳因弯折而导致自身受到过大拉伸应力发生断裂的情况。
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的两个端面以及从端面延伸出的极耳，电极 组件包括两个以上的电极单元，两个以上的电极单元沿轴向层叠设置；集流单元，集流单元包括第一片材和连接于第一片材的第一集流片，第一片材沿轴向延伸，极耳沿第一方向延伸并且连接于第一集流片，极耳与第一集流片相连接的部分与第一集流片在轴向上层叠设置。
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、密封壳体的顶盖组件以及用于连接顶盖组件和电极组件的集流单元。集流单元包括第一片材和与第一片材相连接的第一集流片。电极组件的极耳连接于第一集流片。电极组件的极耳沿第一方向大致沿直线从端面上延伸出，并且与第一集流片相连接。极耳与第一集流片相连接的部分与第一集流片在轴向上层叠设置。由于极耳从端面延伸出之后不经过折弯操作即可与第一集流片相连接，因此极耳整体不会出现因弯折而出现拉伸应力过大导致自身断裂的情况，有效提高二次电池的成品率。
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。
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是本申请又一实施例的二次电池的分解结构示意图；
图7是图6实施例中的集流单元的结构示意图；
图8是本申请另一实施例的二次电池的分解结构示意图；
图9是本申请再一实施例的二次电池的分解结构示意图；
图10是图9实施例中的集流单元的结构示意图。
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、集流单元；141、第一片材；141a、主体部；141b、外延部；142、第一集流片；142a、第一连接端；143、第二集流片；143a、第二连接端；144、第一连接片；145、第二连接片；146、第二片材；146a、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”、“第三”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9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，容纳孔11a的轴向X与容纳孔11a的延伸方向平行。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3所示，本实施例的电极组件13包括两个以上的沿容纳孔11a的轴向X层叠设置的电极单元131。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。从本体延伸出的未涂覆区则作为子极耳。参见图3所示，电极单元131包括沿第一方向Y相对设置的两个子端面131c以及两个子极耳131d。两个子极耳分别是正极耳和负极耳。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，而每个电极组件13的极耳13b包括各个电极单元131的子极耳131d。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通过集流单元14电连接。
参见图2所示，本申请实施例的集流单元14用于连接电极组件13和顶盖组件12的极柱122。集流单元14包括第一片材141和连接于第一片材141的第一集流片142。第一片材141沿轴向X延伸。极耳13b沿第一方向Y延伸并且连接于第一集流片142。极耳13b与第一集流片142相连接的部分与第一集流片142在轴向X上层叠设置。在一个实施例中，第一集流片142用于与极耳13b相连接的表面与极耳13b用于与第一集流片142相连接的表面基本处于同一水平面，从而极耳13b从电极组件13的端面13a上直接延伸出后，其用于与第一集流片142相连接的表面可以与第一集流片142直接连接。这样，不需要对极耳13b进行弯折操作再将弯折后的自由端部与第一集流片142相连接，从而避免极耳13b出现因弯折而导致自身承受过大拉伸应力而出现断裂或裂纹的情况，从而降低电极组件13因极耳13b损坏而失效的失效率，提高二次电池10的成品率，有效降低生产成本。
本申请实施例的第一集流片142具有与第一片材141连接的第一连接端142a。第一连接端142a沿与轴向X和第一方向Y相垂直的第二方向Z延伸。第一集流片142的厚度方向与轴向X相同。这样，第一集流片142沿轴向X相对的两个表面的面积相对较大，从而极耳13b与两个表面中的一者相连接后的连接状态更加稳定可靠。
本申请实施例的第一集流片142位于第一片材141靠近壳体11的一侧。极耳13b连接于第一集流片142朝向或背向顶盖组件12的表面。这样，第一集流片142远离电极组件13，并且在轴向X上相对两侧能够预留出足够大的让位空间。在第一集流片142与极耳13b采用超声波焊接连接 时，便于超声波设备沿轴向X从第一集流片142的两侧夹住第一集流片142，从而便于进行超声波焊接操作。
参见图5和图6所示，本申请实施例的集流单元14还包括连接于第一片材141的第二集流片143。第一集流片142和第二集流片143均位于第一片材141靠近壳体11的一侧。第一集流片142和第二集流片143位于第一片材141的同一侧。第一集流片142和第二集流片143之间在第二厚度方向上间隔预定距离，以在两者之间形成让位空间。在第一集流片142和第二集流片143各自与极耳13b采用超声波焊接连接时，便于超声波设备沿第二厚度方向从一集流片或第二集流片143的两侧夹住第一集流片142或第二集流片143，从而便于进行超声波焊接操作。电极组件13的数量为两组。两组电极组件13沿轴向X层叠设置。一组电极组件13的极耳13b与第一集流片142电连接，另一组电极组件13的极耳13b与第二集流片143电连接。极耳13b与第二集流片143相连接的部分与第二集流片143在轴向X上层叠设置。这样，不需要对电极组件13的极耳13b进行弯折操作再将弯折后的自由端部与第二集流片143相连接，从而避免极耳13b出现因弯折而导致自身承受过大拉伸应力而出现断裂或裂纹的情况，从而降低电极组件13因极耳13b损坏而失效的失效率。
参见图6所示，本申请实施例的第一片材141包括沿轴向X延伸的主体部141a以及连接于主体部141a的外延部141b。外延部141b沿与轴向X和第一方向Y相垂直的第二方向Z向主体部141a的外侧延伸。第一集流片142和第二集流片143分别连接于外延部141b沿轴向X的两端。由于第一集流片142和第二集流片143分别连接于外延部141b相对的两端，从而延伸出的极耳13b的尺寸不需要太长即可与第一集流片142或第二集流片143连接固定，因此有效缩短极耳13b延伸出的长度，有利于降低极耳13b的空间占用率，提高二次电池10的能量密度，同时也有效降低加工成本。
在一个实施例中，第一集流片142相对于第二集流片143靠近顶盖组件12，一组电极组件13的极耳13b连接于第一集流片142朝向顶盖组件12的表面，另一组电极组件13的极耳13b连接于第二集流片143背向顶 盖组件12的表面，从而第一集流片142和第二集流片143位于两个极耳13b之间。一方面，便于第一集流片142和第二集流片143与各自对应的极耳13b焊接连接，另一方面，可以减小第一集流片142、第二集流片143以及两个极耳13b在轴向X上的最大尺寸，有利于降低第一集流片142、第二集流片143以及两个极耳13b在轴向X上空间占用率，提高二次电池10的能量密度。在一个实施例中，第一集流片142和第二集流片143沿轴向X至少部分重叠设置，有利于减小第一集流片142和第二集流片143在第二方向Z上的空间占用率。优选地，第一集流片142和第二集流片143结构相同，并且第一集流片142和第二集流片143沿轴向X对齐设置。
在一个实施例中，参见图8所示，集流单元14还包括与第一片材141相连接的第一连接片144。第一连接片144沿轴向X延伸并且第一连接片144的厚度方向与第二方向Z平行。第一集流片142通过第一连接片144与第一片材141相连接。在一个实施例中，第一集流片142沿第二方向Z延伸，并且第一集流片142与第一连接片144相交。极耳13b可以连接于第一集流片142朝向或背向所述顶盖组件12的表面上。在第二方向Z上，第一连接片144位于极耳13b的一侧，从而第一连接片144可以在第一方向Y上不凸出于极耳13b，有利于降低第一连接片144的空间占用率，提高二次电池10能量密度。第一集流片142在轴向X上与极耳13b重叠，从而第一集流也可以在第一方向Y上不凸出于极耳13b，进一步地有利于降低第一集流片142的空间占用率，提高二次电池10能量密度。在一个实施例中，第一集流片142具有与第一连接片144连接的第一连接端142a，第一连接端142a沿第一方向Y延伸。第一集流片142的厚度方向与轴向X相同。第一集流片142远离电极组件13，并且在轴向X上相对两侧能够预留出足够大的让位空间。在第一集流片142与极耳13b采用超声波焊接连接时，便于超声波设备沿轴向X从第一集流片142的两侧夹住第一集流片142，从而便于进行超声波焊接操作。
在一个实施例中，参见图9和图10所示，集流单元14还包括与第一片材141相连接的第一连接片144和第二连接片145。第一连接片144和 第二连接片145沿第二方向Z间隔设置并且两者均沿轴向X延伸。第一集流片142通过第一连接片144与第一片材141相连接。第二集流片143通过第二连接片145与第一片材141相连接。在一个实施例中，第一集流片142和第二集流片143均沿第二方向Z延伸，并且第一集流片142和第二集流片143分别与第一连接片144和第一连接片144相交。极耳13b可以连接于第一集流片142和第二集流片143朝向或背向顶盖组件12的表面上。在第二方向Z上，第一连接片144和第二连接片145均位于极耳13b的一侧，从而第一连接片144和第二连接片145可以在第一方向Y上均不凸出于各自相对应的极耳13b，有利于降低第一连接片144和第二连接片145的空间占用率，提高二次电池10能量密度。第一集流片142和第二集流片143均在轴向X上与各自相对应的极耳13b重叠，从而第一集流和第二集流片143也可以在第一方向Y上均不凸出于各自相对应的极耳13b，进一步地有利于降低第一集流片142和第二集流片143的空间占用率，提高二次电池10能量密度。在一个实施例中，第一集流片142相对于第二集流片143靠近顶盖组件12，一组电极组件13的极耳13b连接于第一集流片142朝向或背向顶盖组件12的表面，另一组电极组件13的极耳13b连接于第二集流片143朝向或背向顶盖组件12的表面。
本申请实施例的第一集流片142具有与第一片材141连接的第一连接端142a。第二集流片143具有与第一片材141连接的第二连接端143a。第一连接端142a和第二连接端143a均沿第一方向Y延伸。第一集流片142和第二集流片143的厚度方向均与轴向X相同。在一个实施例中，第一集流片142和第二集流片143均为矩形结构，并且各自的长度方向与第二方向Z相同。
在一个实施例中，电极组件13的数量为两组。两组电极组件13沿轴向X层叠设置。每组电极组件13均包括两个电极单元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。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131的子极耳131d在轴向X上从子端面131c靠近另一个电极单元131的区域延伸出，从而两个电极单元131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第一集流片142和第二集流片143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占用空间率，提高二次电池10的能量密度。
在一个实施例中，电极单元131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。参见图3或图8所示，每个电极组件13包括两个电极单元131。极耳13b从端面13a靠近两个电极单元131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131引出的两个子极耳131d的尺寸大致相同，有利于电极单元131加工制造工序一致性，降低加工制造成本。
在一个实施例中，参见图7或图10所示，集流单元还包括与第一片材141相连接的第二片材146。本实施例的第二片材146的厚度方向与轴向X相同。第二片材146具有远离电极组件13的凸台146a。第二片材146通过凸台146a与顶盖组件12所包括的极柱122电连接。
在一个实施例中，参见图3或图6所示，集流单元14的数量为两个。顶盖板121上设置两个极柱122，而两个集流单元14分别与两个极柱122相连接。两个集流单元14在第一方向Y上间隔设置。在第一方向Y上，电极组件13设置于两个集流单元14之间。电极组件13所包括的电极单元131的本体处于两个集流单元14之间，而电极组件13所包括的两个极耳13b分别对应两个集流单元14。一个极耳13b和一个集流单元14相连接，另一个极耳13b和另一个集流单元14相连接。本实施例中，两个集流单元14各自通过第一集流片142与相对应的极耳13b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131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131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，能够有效提升使用过程安全性。
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 (16)

  1. 一种二次电池，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的两个端面以及从所述端面延伸出的极耳，所述电极组件包括两个以上的电极单元，两个以上的所述电极单元沿所述轴向层叠设置；
    集流单元，所述集流单元包括第一片材和连接于所述第一片材的第一集流片，所述第一片材沿所述轴向延伸，所述极耳沿所述第一方向延伸并且连接于所述第一集流片，所述极耳与所述第一集流片相连接的部分与所述第一集流片在所述轴向上层叠设置。
  2. 根据权利要求1所述的二次电池，其中，所述第一集流片具有与所述第一片材连接的第一连接端，所述第一连接端沿与所述轴向和所述第一方向相垂直的第二方向延伸，所述第一集流片的厚度方向与所述轴向相同。
  3. 根据权利要求1所述的二次电池，其中，所述第一集流片位于所述第一片材靠近所述壳体的一侧，所述极耳连接于所述第一集流片朝向或背向所述顶盖组件的表面。
  4. 根据权利要求1所述的二次电池，其中，所述集流单元还包括与所述第一片材相连接的第一连接片，所述第一连接片沿所述轴向延伸并且所述第一连接片的厚度方向与第二方向平行，所述第二方向与所述轴向和所述第一方向相垂直，所述第一集流片通过所述第一连接片与所述第一片材相连接。
  5. 根据权利要求4所述的二次电池，其中，所述第一集流片具有与所述第一连接片连接的第一连接端，所述第一连接端沿所述第一方向延伸，所述第一集流片的厚度方向与所述轴向相同。
  6. 根据权利要求1所述的二次电池，其中，所述集流单元还包括连 接于所述第一片材的第二集流片，所述第一集流片和所述第二集流片均位于所述第一片材靠近所述壳体的一侧，所述电极组件的数量为两组，两组所述电极组件沿所述轴向层叠设置，一组所述电极组件的所述极耳与所述第一集流片电连接，另一组所述电极组件的所述极耳与所述第二集流片电连接，所述极耳与所述第二集流片相连接的部分与所述第二集流片在所述轴向上层叠设置。
  7. 根据权利要求6所述的二次电池，其中，所述第一片材包括沿所述轴向延伸的主体部以及连接于所述主体部的外延部，所述外延部沿与所述轴向和所述第一方向相垂直的第二方向向所述主体部的外侧延伸，所述第一集流片和所述第二集流片分别连接于所述外延部沿所述轴向的两端。
  8. 根据权利要求7所述的二次电池，其中，所述第一集流片相对于所述第二集流片靠近所述顶盖组件，一组所述电极组件的所述极耳连接于所述第一集流片朝向所述顶盖组件的表面，另一组所述电极组件的所述极耳连接于所述第二集流片背向所述顶盖组件的表面。
  9. 根据权利要求6所述的二次电池，其中，所述第一集流片和所述第二集流片沿所述轴向至少部分重叠设置。
  10. 根据权利要求6所述的二次电池，其中，所述集流单元还包括与所述第一片材相连接的第一连接片和第二连接片，所述第一连接片和所述第二连接片沿与所述轴向和所述第一方向相垂直的第二方向间隔设置并且两者均沿所述轴向延伸，所述第一集流片通过所述第一连接片与所述第一片材相连接，所述第二集流片通过所述第二连接片与所述第一片材相连接。
  11. 根据权利要求10所述的二次电池，其中，所述第一集流片相对于所述第二集流片更靠近所述顶盖组件，一组所述电极组件的所述极耳连接于所述第一集流片朝向或背向所述顶盖组件的表面，另一组所述电极组件的所述极耳连接于所述第二集流片朝向或背向所述顶盖组件的表面。
  12. 根据权利要求10所述的二次电池，其中，所述第一集流片具有与所述第一片材连接的第一连接端，所述第二集流片具有与所述第一片材连接的第二连接端，所述第一连接端和所述第二连接端均沿所述第一方向 延伸，所述第一集流片和所述第二集流片的厚度方向均与所述轴向相同。
  13. 根据权利要求1所述的二次电池，其中，所述电极组件的数量为两组，两组所述电极组件沿所述轴向层叠设置，每组所述电极组件均包括两个所述电极单元，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。
  14. 根据权利要求13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。
  15. 根据权利要求1所述的二次电池，其中，所述集流单元的数量为两个，在所述第一方向上，所述电极组件设置于两个所述集流单元之间，两个所述集流单元各自通过所述第一集流片与相对应的所述极耳电连接。
  16. 一种电池模组，包括两个以上的如权利要求1至15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。
PCT/CN2019/076266 2018-12-29 2019-02-27 二次电池以及电池模组 WO2020133673A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19848926.2A EP3907783A4 (en) 2018-12-29 2019-02-27 SECONDARY BATTERY AND BATTERY MODULE
US17/362,960 US20210328293A1 (en) 2018-12-29 2021-06-29 Secondary battery and battery module

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811646743.0 2018-12-29
CN201811646743.0A CN111384352A (zh) 2018-12-29 2018-12-29 二次电池以及电池模组

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/362,960 Continuation US20210328293A1 (en) 2018-12-29 2021-06-29 Secondary battery and battery module

Publications (1)

Publication Number Publication Date
WO2020133673A1 true WO2020133673A1 (zh) 2020-07-02

Family

ID=71126680

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/076266 WO2020133673A1 (zh) 2018-12-29 2019-02-27 二次电池以及电池模组

Country Status (4)

Country Link
US (1) US20210328293A1 (zh)
EP (1) EP3907783A4 (zh)
CN (1) CN111384352A (zh)
WO (1) WO2020133673A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4089808A1 (en) * 2021-05-14 2022-11-16 CALB Co., Ltd. Battery, battery module, battery pack and battery manufacturing method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111463367A (zh) * 2019-01-22 2020-07-28 宁德时代新能源科技股份有限公司 二次电池以及电池模组

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206650130U (zh) * 2017-04-28 2017-11-17 长城汽车股份有限公司 电池单元及其电极组件和集流体
CN108198989A (zh) * 2018-01-16 2018-06-22 宁德时代新能源科技股份有限公司 连接构件和充电电池

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101826609A (zh) * 2009-12-22 2010-09-08 湖南科霸汽车动力电池有限责任公司 一种电池极片与极耳的连接方法
WO2014027606A1 (ja) * 2012-08-14 2014-02-20 株式会社 豊田自動織機 蓄電装置
KR20140137180A (ko) * 2013-05-22 2014-12-02 삼성에스디아이 주식회사 이차 전지
JP5796623B2 (ja) * 2013-12-13 2015-10-21 株式会社Ｇｓユアサ 電池
KR102067713B1 (ko) * 2016-05-31 2020-01-17 주식회사 엘지화학 배터리 모듈 및 이를 포함하는 배터리 팩, 자동차
CN207800665U (zh) * 2018-02-01 2018-08-31 宁德时代新能源科技股份有限公司 二次电池的顶盖组件以及二次电池
CN108428921A (zh) * 2018-02-01 2018-08-21 宁德时代新能源科技股份有限公司 二次电池
CN209217103U (zh) * 2018-12-29 2019-08-06 宁德时代新能源科技股份有限公司 二次电池以及电池模组

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206650130U (zh) * 2017-04-28 2017-11-17 长城汽车股份有限公司 电池单元及其电极组件和集流体
CN108198989A (zh) * 2018-01-16 2018-06-22 宁德时代新能源科技股份有限公司 连接构件和充电电池

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3907783A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4089808A1 (en) * 2021-05-14 2022-11-16 CALB Co., Ltd. Battery, battery module, battery pack and battery manufacturing method

Also Published As

Publication number Publication date
CN111384352A (zh) 2020-07-07
EP3907783A1 (en) 2021-11-10
EP3907783A4 (en) 2023-06-14
US20210328293A1 (en) 2021-10-21

Similar Documents

Publication Publication Date Title
WO2020133675A1 (zh) 二次电池以及电池模组
WO2020151549A1 (zh) 二次电池以及电池模组
WO2020215919A1 (zh) 电池单元和电池模组
US11177539B2 (en) Current collector and secondary battery
WO2020199955A1 (zh) 二次电池以及电池模组
WO2020134748A1 (zh) 二次电池、电池模组以及二次电池的制造方法
WO2020135808A1 (zh) 二次电池以及电池模组
WO2021027775A1 (zh) 二次电池
US20210328293A1 (en) Secondary battery and battery module
WO2020134745A1 (zh) 二次电池、电池模组以及二次电池的制造方法
CN213636154U (zh) 电芯组件和电池
WO2024119911A1 (zh) 电化学装置以及电子装置
KR102265846B1 (ko) 전극단자 접속 플레이트를 포함하고 있는 전지팩
WO2023115744A1 (zh) 一种便于成组的锂离子电池
WO2020134746A1 (zh) 二次电池、电池模组以及二次电池的制造方法
CN215119168U (zh) 电池
CN220400661U (zh) 一种电芯以及电芯模组
WO2024087335A1 (zh) 电池单体、电池及用电设备
CN116759756A (zh) 电池模组、电池模组装配方法及动力电池包
CN114300814A (zh) 用于非等极耳与顶盖的极柱结构、焊接方法及其锂电池

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2019848926

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2019848926

Country of ref document: EP

Effective date: 20210729