WO2020088240A1 - 顶压板、二次电池以及二次电池的制造方法 - Google Patents

顶压板、二次电池以及二次电池的制造方法 Download PDF

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Publication number
WO2020088240A1
WO2020088240A1 PCT/CN2019/111201 CN2019111201W WO2020088240A1 WO 2020088240 A1 WO2020088240 A1 WO 2020088240A1 CN 2019111201 W CN2019111201 W CN 2019111201W WO 2020088240 A1 WO2020088240 A1 WO 2020088240A1
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WO
WIPO (PCT)
Prior art keywords
main body
pressing plate
secondary battery
insulating member
hole
Prior art date
Application number
PCT/CN2019/111201
Other languages
English (en)
French (fr)
Inventor
朱宝健
陈雷
徐守江
冯春艳
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 US16/978,739 priority Critical patent/US20200411897A1/en
Priority to EP19858627.3A priority patent/EP3675237B1/en
Publication of WO2020088240A1 publication Critical patent/WO2020088240A1/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
    • H01M10/0481—Compression means other than compression means for stacks of electrodes and separators
    • 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
    • H01M10/0468—Compression means for stacks of electrodes and separators
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/50—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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/579—Devices or arrangements for the interruption of current in response to shock
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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 top pressing plate, a secondary battery, and a method for manufacturing a secondary battery.
  • the secondary battery generally includes an electrode assembly, a case, and a top cover assembly.
  • the electrode assembly is formed by winding a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet around a winding axis.
  • the positive electrode sheet active material is coated on the coating area of the positive electrode sheet
  • the negative electrode sheet active material is coated on the coating area of the negative electrode sheet.
  • a plurality of uncoated areas extending from the coated area of the main body are stacked to form a tab.
  • the electrode assembly includes two tabs, namely a positive tab and a negative tab. The positive tab extends from the coating area of the positive tab; the negative tab extends from the coating area of the negative tab.
  • the electrode assembly is housed in the casing, the top cover assembly is assembled with the casing, and is provided corresponding to the end of the electrode assembly on the winding axis.
  • the top cover assembly includes a top cover sheet and an electrode terminal provided on the top cover sheet, wherein the tab of the electrode assembly is electrically connected to the electrode terminal of the top cover assembly.
  • the secondary battery will vibrate during use, so that the electrode assembly will move in the case, which in turn causes the tabs to bend back and forth. In this way, the pole ear is prone to break after being bent many times.
  • Embodiments of the present application provide a top pressing plate, a secondary battery, and a method for manufacturing a secondary battery.
  • the top pressing plate can limit the position of the electrode assembly in the case, maintain the position of the electrode assembly in a stable state, reduce the possibility of the pole ear breaking due to the movement of the main body, and improve the secondary Battery safety.
  • an embodiment of the present application provides a top pressing plate for a secondary battery, wherein the secondary battery includes a top cover sheet, an electrode terminal, and an insulating member, the electrode terminal is provided on the top cover sheet, and the electrode assembly includes a main body and The tab is connected to the main body. The tab is connected to the electrode terminal.
  • the insulating member is disposed between the top cover sheet and the main body. The insulating member has a connecting convex portion extending toward the main body.
  • the top pressing plate includes:
  • the top pressing plate can be disposed between the insulating member and the main body portion, the first surface faces the main body portion, the connecting convex portion can cooperate with the mounting hole, and the top end surface of the connecting convex portion does not exceed the first surface.
  • the mounting hole is a through hole
  • the mounting hole includes a connecting hole segment and a receiving hole segment communicating with the connecting hole segment.
  • the top pressure plate includes first and second ends oppositely arranged along the length direction of the top pressure plate, and the first end and the second end are provided with mounting holes.
  • the diameter of the accommodating hole section provided at the first end is smaller than the aperture of the accommodating hole section provided at the second end.
  • the first end is provided with two mounting holes, and the two mounting holes are spaced along the width direction of the top pressure plate; and / or, the second end is provided with two mounting holes, two The mounting holes are arranged at intervals along the width direction of the top pressing plate.
  • the top pressing plate When the top pressing plate according to the embodiment of the present application is applied to a secondary battery, the top pressing plate can be provided between the top cover sheet and the body portion of the electrode assembly.
  • the top pressing plate can press the main body part, thereby restricting the position of the main body part in the housing, effectively preventing the main body part from moving in the housing, and thereby avoiding the occurrence of the bending and breaking of the tab due to the main body part.
  • an embodiment of the present application proposes a secondary battery, which includes:
  • the mounting hole is a through hole
  • the mounting hole includes a connecting hole segment and a receiving hole segment communicating with the connecting hole segment, the opening of the receiving hole segment faces the main body; Connected so that the insulating member and the top pressing plate are connected and fixed, the connecting convex portion passes through the connecting hole section, and the top end surface is located in the receiving hole section or flush with the first surface.
  • connection convex portion is plug-connected to the connection hole section, and the connection convex portion and the connection hole section are interference fit.
  • the connecting convex portion includes two elastic feet spaced apart, the shape of the outer surface of each elastic foot matches the shape of the hole wall of the connecting hole section, and the outer surface is pressed against the hole wall .
  • the top pressure plate includes first and second ends opposite to each other along the length of the top cover, and both the first and second ends are provided with mounting holes to connect the protrusions.
  • the number and position of the parts correspond to the number and position of the mounting holes.
  • the diameter of the accommodating hole section provided at the first end is smaller than the aperture of the accommodating hole section provided at the second end.
  • the first end is provided with two mounting holes, and the two mounting holes are spaced apart along the width direction of the top cover piece.
  • the second end is provided with two mounting holes, and the two mounting holes are spaced along the width direction of the top cover piece.
  • the insulating member includes a first insulator and a second insulator, the first insulator and the second insulator are spaced apart along the length of the top cover sheet, and both the first insulator and the second insulator are provided with connection protrusions unit.
  • the secondary battery further includes an adapter tab, the tab has a free end away from the main body, the free end is connected to the electrode terminal through the adapter tab, and the top pressing plate has a receiving groove, the free end and The adapter pieces are all accommodated in the accommodating groove.
  • the secondary battery according to the embodiment of the present application includes a case, an electrode assembly, a top cover assembly, and a top pressing plate.
  • the casing and the top cover assembly are hermetically connected to enclose the electrode assembly in the casing.
  • the top pressing plate is disposed in the casing, and the top pressing plate can fix the electrode assembly. Since the top pressing plate is provided between the insulating member and the main body of the electrode assembly, the electrode assembly is fixed by the top pressing plate to ensure the position of the electrode assembly in the case is stable, and the breakage of the pole ear due to the movement of the main body is reduced Possibility to improve the safety of secondary batteries.
  • an embodiment of the present application provides a method for manufacturing a secondary battery, including:
  • the electrode assembly includes a main body portion and a tab connected to the main body portion, and connect the tab to the electrode terminal;
  • the insulating member has a connecting convex portion, the insulating member is disposed between the top cover sheet and the main body portion, and the connecting convex portion faces the main body portion;
  • the top pressing plate has a first surface and a mounting hole, the top pressing plate is provided between the insulating member and the main body portion, and the first surface is directed toward the main body portion, the connecting convex portion cooperates with the mounting hole, and the The top surface does not exceed the first surface.
  • FIG. 1 is a schematic diagram of an exploded structure of a secondary battery according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of an exploded structure of a secondary battery according to another embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a top pressing plate according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a connection state of a top pressing plate and an insulating member according to an embodiment of the present application
  • FIG. 5 is a partial enlarged view at A in FIG. 4;
  • FIG. 6 is a schematic diagram of a connection state of an insulating member and a top cover sheet according to an embodiment of the present application
  • FIG. 7 is a partial enlarged view of B in FIG. 6;
  • FIG. 8 is a schematic diagram of a partial cross-sectional structure of a secondary battery according to an embodiment of the present application.
  • FIG. 9 is a flowchart of a method for manufacturing a secondary battery according to an embodiment of the present application.
  • Electrode assembly 201, body part; 202, pole ear; 202a, connecting end; 202b, middle section; 202c, free end;
  • Insulating member 50a, first insulator; 50b, second insulator; 501, connecting convex portion; 501a, top surface; 502, elastic foot;
  • top platen 600a, first surface; 600b, second surface; 60a, first end; 60b, second end; 601, mounting hole; 601a, connecting hole section; 601b, receiving hole section; 602, Containment slot
  • X length direction
  • Y width 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.
  • the secondary battery according to the embodiment of the present application includes a case 10, an electrode assembly 20 disposed in the case 10, and a top cover assembly that is sealingly connected to the case 10.
  • the housing 10 of this embodiment may have a hexahedral shape or other shapes.
  • the case 10 of this embodiment has an internal space that houses the electrode assembly 20 and the electrolyte.
  • the housing 10 of this embodiment may be made of materials such as aluminum or aluminum alloy.
  • the top cover assembly of this embodiment includes a top cover sheet 30 and an electrode terminal 40 provided on the top cover sheet 30. The top cover assembly is sealingly connected to the housing 10 through the top cover sheet 30.
  • the top cover sheet 30 of this embodiment has a predetermined length and width.
  • the electrode assembly 20 of the embodiment of the present application includes a main body portion 201 and a tab 202 connected to the main body portion 201.
  • the electrode assembly 20 is connected to the electrode terminal 40 through the tab 202.
  • the body portion 201 is formed by spirally winding the first pole piece, the second pole piece, and the separator together around the winding axis.
  • the isolation film is an insulator between the first pole piece and the second pole piece.
  • the body portion 201 of this embodiment has a flat structure as a whole, and has a predetermined thickness, height, and width.
  • 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
  • the negative electrode active material is coated on the coating area of the negative electrode.
  • a plurality of uncoated areas extending from the coating area of the main body portion 201 are stacked, and the plurality of stacked uncoated areas are used as the tabs 202.
  • the electrode assembly 20 includes two tabs 202, namely a positive tab and a negative tab.
  • 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 top cover assembly of this embodiment also includes an insulating member 50.
  • the insulating member 50 is provided between the top cover sheet 30 and the main body 201.
  • the insulating member 50 has a connection convex portion 501 extending toward the main body portion 201.
  • the insulating member 50 can be connected and fixed to the top cover sheet 30.
  • the insulating member 50 is used to physically insulate the top cover sheet 30 from the main body portion 201 included in the electrode assembly 20.
  • the secondary battery of this embodiment further includes a top pressing plate 60.
  • the pressing plate 60 is provided between the insulating member 50 and the main body 201.
  • the pressing plate 60 has a first surface 600 a facing the main body 201 and a second surface 600 b facing away from the main body 201.
  • the first surface 600a and the second surface 600b are oppositely arranged along the thickness direction of the top pressing plate 60 itself.
  • the thickness direction of the top pressing plate 60 is the same as the thickness direction of the top cover sheet 30.
  • the first surface 600a and the second surface 600b are oppositely arranged along the height direction of the secondary battery (direction perpendicular to both the longitudinal direction X and the width direction Y).
  • the first surface 600a of the top pressing plate 60 can apply compressive stress to the main body portion 201 to form a limit to the entire electrode assembly 20 through the main body portion 201 to prevent the electrode assembly 20 from up and down inside the case 10 mobile.
  • the top pressing plate 60 has a mounting hole 601.
  • the mounting hole 601 extends from the second surface 600b toward the first surface 600a.
  • the connecting convex portion 501 included in the insulating member 50 cooperates with the mounting hole 601 to connect and fix the insulating member 50 and the pressing plate 60 to each other.
  • the connection convex portion 501 included in the insulating member 50 has a distal end surface 501 a facing the main body portion 201.
  • the top end surface 501 a of the connecting convex portion 501 does not exceed the first surface 600 a of the top pressing plate 60.
  • the secondary battery according to the embodiment of the present application includes the case 10, the electrode assembly 20, the top cover assembly, and the top pressing plate 60.
  • the case 10 and the top cover assembly are hermetically connected to close the electrode assembly 20 inside the case 10.
  • the top pressing plate 60 is provided in the case 10, and the top pressing plate 60 can fix the electrode assembly 20. Since the top pressing plate 60 is provided between the insulating member 50 and the main body portion 201 of the electrode assembly 20, the electrode assembly 20 is limited and fixed by the top pressing plate 60 to ensure the stable position of the electrode assembly 20 in the case 10, reducing the main body portion The possibility that 201 will move and lead to frequent bending and breakage of the pole lug 202 will improve the safety of the secondary battery.
  • the insulating member 50 included in the top cover assembly itself has a connection convex portion 501
  • the top pressing plate 60 has a mounting hole 601.
  • the connecting convex portion 501 of the insulating member 50 is connected to the mounting hole 601 of the top pressing plate 60, so that the position of the top pressing plate 60 is restricted and restricted by the insulating member 50, and does not move within the case 10, and is then assembled in the secondary battery During the process, the pressing plate 60 will not damage the pole piece or the separator included in the main body 201 due to its own movement.
  • the tip surface 501a of the connecting convex portion 501 does not apply compressive stress to the main body portion 201, thereby reducing the pair of connecting convex portions 501 of the insulating member 50
  • the possibility that the pole piece or separator included in the main body portion 201 causes local crushing damage will improve the safety of the secondary battery.
  • the mounting hole 601 included in the top pressing plate 60 of this embodiment is a through hole.
  • the through hole penetrates from the second surface 600b to the first surface 600a.
  • the mounting hole 601 includes a connecting hole segment 601a and a receiving hole segment 601b communicating with the connecting hole segment 601a.
  • the diameter of the accommodating hole section 601b is larger than the connecting hole section 601a to reduce the length of the connecting hole section 601a, thereby improving the influence of the manufacturing error of the connecting hole section 601a on the connecting convex portion 501 during assembly.
  • the receiving hole section 601b is close to the main body portion 201 with its opening facing the main body portion 201, and the connecting hole section 601a is close to the insulating member 50.
  • the connecting convex portion 501 of this embodiment is connected to the connecting hole section 601 a to connect and fix the insulating member 50 and the pressing plate 60.
  • the connecting convex portion 501 passes through the connecting hole section 601a, and the top end surface 501a is located in the receiving hole section 601b or flush with the first surface 600a of the top pressing plate 60 facing the main body portion 201.
  • the top surface 501a included in the connection convex portion 501 of the first surface 600a of the top pressing plate 60 does not stress the main body 201, thereby The connection convex portion 501 does not cause local crush damage to the pole piece and / or the separator included in the body portion 201.
  • connection convex portion 501 and the connection hole section 601 a are inserted and connected, and the connection convex portion 501 and the connection hole section 601 a are interference fit.
  • the connection convex portion 501 and the connection hole section 601a are connected by an interference fit, which can ensure the stable connection of the connection convex portion 501 and the top pressure plate 60, while reducing the number of parts used, and the connection convex portion 501 and the connection hole section 601a can Realize quick connection and high assembly efficiency.
  • the connecting convex portion 501 of this embodiment includes two elastic feet 502 arranged at intervals.
  • the shape of the outer surface of each elastic leg 502 matches the shape of the hole wall of the connecting hole segment 601a, and the outer surface is pressed against the hole wall.
  • the two elastic legs 502 can be contracted to easily enter the connecting hole section 601a, and after being installed to a predetermined position, the elastic legs 502 can be under the action of their own elastic restoring force More compressive stress is applied to the hole wall of the connection hole section 601a, thereby increasing the friction between the connection protrusion 501 and the hole wall of the connection hole section 601a, making the connection protrusion 501 and the top pressing plate 60 more stable and reliable.
  • the top end of the elastic foot 502 has a hook.
  • connection stability of the portion 501 and the top pressing plate 60 After the top end of the elastic foot 502 passes through the connecting hole section 601a, the hook can be caught on the stepped surface between the connecting hole section 601a and the receiving hole section 601b, so that the elastic foot 502 is not easy to come out from the mounting hole 601, and further improve the connection protrusion The connection stability of the portion 501 and the top pressing plate 60.
  • the cross section of the connecting hole section 601a is circular, and the cross section of the receiving hole section 601b is rectangular.
  • Each elastic foot 502 has a cross-sectional shape of a half circle to a half circle.
  • the top pressing plate 60 of this embodiment includes a first end 60a and a second end 60b that are oppositely arranged along the longitudinal direction of the top pressing plate 60 itself.
  • the longitudinal direction of the top pressing plate 60 is the same as the longitudinal direction X of the top cover sheet 30.
  • Both the first end 60a and the second end 60b are provided with mounting holes 601.
  • the number and position of the connection protrusions 501 correspond to the number and position of the mounting holes 601.
  • connection protrusions 501 By providing mounting holes 601 on both ends of the top pressing plate 60 and correspondingly providing connection protrusions 501 on the insulating member 50 at the same time, the number of connection points between the insulating member 50 and the top pressing plate 60 can be increased to further effectively improve the connection protrusions The stability of the connection between 501 and the top pressing plate 60 reduces the possibility of the top pressing plate 60 moving.
  • the diameter of the receiving hole section 601b provided on the first end 60a on the top pressing plate 60 of this embodiment is smaller than that of the receiving hole section 601b provided on the second end 60b, so that the top pressing plate 60 has a foolproof function and avoids assembly During the process, the top pressing plate 60 is incorrectly installed, effectively improving the efficiency and accuracy of the assembly process.
  • the first end 60a included in the top pressing plate 60 of this embodiment is provided with two mounting holes 601.
  • the two mounting holes 601 are arranged along the interval, so that when the two connecting protrusions 501 and the two mounting holes 601 are completed, the top pressing plate 60 can be prevented from rotating, and the top pressing plate 60 can be prevented from rotating and scratching the main body 201.
  • the width direction of the top pressing plate 60 is the same as the width direction Y of the top cover sheet 30.
  • the second end portion 60b included in the top pressing plate 60 is provided with two mounting holes 601.
  • the two mounting holes 601 are arranged at intervals in the width direction Y of the top cover sheet 30. In this way, both the first end portion 60a and the second end portion 60b of the top pressure plate 60 are constrained, so that the entire top pressure plate 60 does not rotate, preventing the top pressure plate 60 from rotating and scratching the main body portion 201.
  • the insulating member 50 of this embodiment includes a first insulator 50a and a second insulator 50b.
  • the first insulator 50 a and the second insulator 50 b are arranged at intervals along the longitudinal direction X of the top cover sheet 30.
  • Both the first insulator 50a and the second insulator 50b are provided with a connection convex portion 501.
  • a yield gap is formed between the first insulator 50a and the second insulator 50b.
  • the top cover sheet 30 has an explosion-proof valve corresponding to the clearance. When the internal pressure of the secondary battery is too large and the explosion-proof valve is opened, the airflow can be smoothly and quickly discharged through the clearance and the opened explosion-proof valve.
  • the use of a split structure for the insulating member 50 can reduce its own overall weight, which is beneficial to increase the energy density of the secondary battery.
  • the secondary battery of this embodiment further includes an adapter tab 70.
  • the tab 202 has a free end 202 c away from the main body 201, a connection end 202 a connected to the main body 201, and a free end 202 c and a connection The middle section 202b of the end 202a.
  • the free end 202c is connected to the electrode terminal 40 via a transition piece 70.
  • the free end 202c is welded to the adapter 70.
  • the top pressing plate 60 has a receiving groove 602.
  • the receiving groove 602 is recessed from the second surface 600b toward the first surface 600a. Both the free end 202c and the adapter piece 70 are accommodated in the accommodating groove 602.
  • the overall height of the pole lug 202, the adapter sheet 70, and the top pressing plate 60 is small, which effectively saves the internal space of the housing 10, which is beneficial to increase the energy density of the secondary battery;
  • the ear 202 is connected and fixed to the adapter sheet 70 by welding. Therefore, when welding slag is generated in the welding area of the secondary battery during assembly or use, the receiving groove 602 of the top pressing plate 60 can collect the welding slag to effectively prevent welding The slag drops onto the main body 201, reducing the possibility of the welding slag puncturing the pole piece or separator included in the main body 201, and improving the safety of the secondary battery.
  • the top pressing plate 60 of this embodiment can The welding area of the tab 202 and the adapter sheet 70 is physically isolated from the main body 201.
  • the secondary battery of the embodiment of the present application includes a top pressing plate 60 capable of applying compressive stress to the main body portion 201 included in the electrode assembly 20.
  • the top pressing plate 60 can effectively restrain and restrict the main body 201 to prevent the main body 201 from moving up and down in the casing 10, thereby ensuring the stable position of the electrode assembly 20 in the casing 10, and reducing The possibility of frequent breakage of the ear 202 bends, improving the safety of the secondary battery.
  • the insulating member 50 included in the top cover assembly itself has a connection convex portion 501, and the top pressing plate 60 has a mounting hole 601.
  • the connecting convex portion 501 of the insulating member 50 is connected to the mounting hole 601 of the top pressing plate 60, so that the position of the top pressing plate 60 is restricted and restricted by the insulating member 50, does not move within the case 10, and reduces assembly in the secondary battery During the process, the moving top pressing plate 60 may damage the pole piece or the separator included in the main body 201. Since the connecting convex portion 501 of the insulating member 50 does not exceed the first surface 600a of the top pressing plate 60, the top end surface 501a of the connecting convex portion 501 does not apply compressive stress to the main body portion 201, thereby reducing The possibility that the pole piece or separator included in the main body portion 201 causes local crushing damage will improve the safety of the secondary battery.
  • an embodiment of the present application proposes a method for manufacturing a secondary battery, which includes:
  • the electrode assembly 20 includes a body portion 201 and a tab 202 connected to the body portion 201, and the tab 202 is connected to the electrode terminal 40;
  • the insulating member 50 has a connecting convex portion 501, the insulating member 50 is provided between the top cover sheet 30 and the main body portion 201, and the connecting convex portion 501 faces the main body portion 201;
  • the top pressing plate 60 has a first surface 600a and a mounting hole 601
  • the top pressing plate 60 is disposed between the insulating member 50 and the main body portion 201, and the first surface 600a is directed toward the main body portion 201, connecting the convex portion 501 and The mounting hole 601 fits, and the top end surface 501a of the connecting convex portion 501 does not exceed the first surface 600a.

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Abstract

一种顶压板（60）、二次电池以及二次电池的制造方法。顶压板（60）用于二次电池，其中，二次电池包括顶盖片（30）、电极端子（40）和绝缘构件（50），电极端子（40）设置于顶盖片（30），电极组件（20）包括主体部（201）以及连接于主体部（201）的极耳（202），极耳（202）连接于电极端子（40），绝缘构件（50）设置于顶盖片（30）与主体部（201）之间，绝缘构件（50）具有朝主体部（201）延伸的连接凸部（501），顶压板（60）包括：沿自身厚度方向相对设置的第一表面（600a）和第二表面（600b）以及从第二表面（600b）朝第一表面（600a）延伸的安装孔（601）；顶压板（60）能够设置于绝缘构件（50）与主体部（201）之间，第一表面（600a）朝向主体部（201），连接凸部（501）能够与安装孔（601）相配合，且连接凸部（501）的顶端面（501a）不超出第一表面（600a）。该顶压板（60）应用于二次电池时，能够限制电极组件（20）在壳体（10）内的位置，降低主体部（201）发生窜动而导致极耳（202）断裂的可能性。

Description

顶压板、二次电池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10月30日提交的名称为“二次电池”的中国专利申请201821776352.6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，特别是涉及一种顶压板、二次电池以及二次电池的制造方法。
背景技术
二次电池一般包括电极组件、壳体和顶盖组件。其中，电极组件通过正极片、负极片以及设置于正极片和负极片之间的隔膜围绕卷绕轴线卷绕形成。正极片活性物质被涂覆在正极片的涂覆区上，而负极片活性物质被涂覆到负极片的涂覆区上。由主体的涂覆区延伸出的多个未涂覆区层叠形成极耳。电极组件包括两个极耳，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。电极组件收容在壳体内，顶盖组件与壳体装配在一起、且与电极组件在卷绕轴线上的端部相对应设置。顶盖组件包括顶盖片以及设置于顶盖片上的电极端子，其中电极组件的极耳与顶盖组件的电极端子电连接。然而，二次电池在使用过程中会出现振动情况，从而电极组件在壳体内会出现窜动，进而导致极耳不断地来回发生弯折。这样，极耳在经过多次弯折后，易于发生断裂。
发明内容
本申请实施例提供一种顶压板、二次电池以及二次电池的制造方法。顶压板应用于二次电池时，顶压板能够限制电极组件在壳体内的位置，使 电极组件的位置保持稳定状态，降低由于主体部发生窜动而导致极耳发生断裂的可能性，提升二次电池的使用安全性。
一方面，本申请实施例提出了一种顶压板，用于二次电池，其中，二次电池包括顶盖片、电极端子和绝缘构件，电极端子设置于顶盖片，电极组件包括主体部以及连接于主体部的极耳，极耳连接于电极端子，绝缘构件设置于顶盖片与主体部之间，绝缘构件具有朝主体部延伸的连接凸部，顶压板包括：
沿自身厚度方向相对设置的第一表面和第二表面以及从第二表面朝第一表面延伸的安装孔；
顶压板能够设置于绝缘构件与主体部之间，第一表面朝向主体部，连接凸部能够与安装孔相配合，且连接凸部的顶端面不超出第一表面。
根据本申请实施例的一个方面，安装孔为贯通孔，安装孔包括连接孔段以及与连接孔段相连通的容纳孔段。
根据本申请实施例的一个方面，顶压板包括沿顶压板的长度方向相对设置的第一端部和第二端部，第一端部和第二端部均设置有安装孔。
根据本申请实施例的一个方面，设置于第一端部的容纳孔段的孔径小于设置于第二端部的容纳孔段的孔径。
根据本申请实施例的一个方面，第一端部设置有两个安装孔，两个安装孔沿顶压板的宽度方向间隔设置；和/或，第二端部设置有两个安装孔，两个安装孔沿顶压板的宽度方向间隔设置。
根据本申请实施例的顶压板应用于二次电池时，顶压板能够设置在顶盖片与电极组件的主体部之间。顶压板能够抵压主体部，从而限制主体部在壳体内的位置，有效阻止主体部在壳体内发生窜动，进而避免出现由于主体部的窜动而导致极耳折弯断裂的情况，提升二次电池的使用安全性。
另一方面，本申请实施例提出了一种二次电池，其包括：
顶盖片；电极端子，电极端子设置于顶盖片上；电极组件，电极组件包括主体部以及连接于主体部的极耳，极耳连接于电极端子；绝缘构件，设置于顶盖片与主体部之间，绝缘构件具有朝主体部延伸的连接凸部；顶压板，顶压板设置于绝缘构件与主体部之间，顶压板具有朝向主体部的第 一表面，顶压板具有安装孔，连接凸部与安装孔相配合，且连接凸部的顶端面不超出第一表面。
根据本申请实施例的另一个方面，安装孔为贯通孔，安装孔包括连接孔段以及与连接孔段相连通的容纳孔段，容纳孔段的开口朝向主体部；连接凸部与连接孔段相连接，以使绝缘构件和顶压板连接固定，连接凸部穿过连接孔段，且顶端面位于容纳孔段内或与第一表面相齐平。
根据本申请实施例的另一个方面，连接凸部与连接孔段插接连接，连接凸部与连接孔段过盈配合。
根据本申请实施例的另一个方面，连接凸部包括两个间隔设置的弹性支脚，每个弹性支脚的外表面的形状与连接孔段的孔壁形状相匹配，且外表面抵压于孔壁。
根据本申请实施例的另一个方面，顶压板包括沿顶盖片的长度方向相对设置的第一端部和第二端部，第一端部和第二端部均设置有安装孔，连接凸部的数量和位置与安装孔的数量和位置均一一对应。
根据本申请实施例的另一个方面，设置于第一端部的容纳孔段的孔径小于设置于第二端部的容纳孔段的孔径。
根据本申请实施例的另一个方面，第一端部设置有两个安装孔，两个安装孔沿顶盖片的宽度方向间隔设置。
根据本申请实施例的另一个方面，第二端部设置有两个安装孔，两个安装孔沿顶盖片的宽度方向间隔设置。
根据本申请实施例的另一个方面，绝缘构件包括第一绝缘体和第二绝缘体，第一绝缘体和第二绝缘体沿顶盖片的长度方向间隔设置，第一绝缘体和第二绝缘体均设置有连接凸部。
根据本申请实施例的另一个方面，二次电池还包括转接片，极耳具有远离主体部的自由端，自由端通过转接片与电极端子相连接，顶压板具有容纳槽，自由端和转接片均被容纳于容纳槽。
根据本申请实施例的二次电池，其包括壳体、电极组件、顶盖组件以及顶压板。壳体和顶盖组件密封连接以将电极组件封闭于壳体内。顶压板设置于壳体内，并且顶压板能够固定电极组件。由于在绝缘构件和电极组 件的主体部之间设置顶压板，从而通过顶压板对电极组件进行固定，保证电极组件在壳体的位置稳定，降低由于主体部发生窜动而导致极耳发生断裂的可能性，提升二次电池的使用安全性。
再一方面，本申请实施例提出了一种二次电池的制造方法，其中，包括：
将顶盖片放置于预定装配工位；
将电极端子安装于顶盖片；
组装电极组件，电极组件包括主体部以及连接于主体部的极耳，将极耳连接于电极端子；
组装绝缘构件，绝缘构件具有连接凸部，将绝缘构件设置于顶盖片和主体部之间，并且使连接凸部朝向主体部；
组装顶压板，顶压板具有第一表面和安装孔，将顶压板设置于绝缘构件与主体部之间，并且使得第一表面朝向主体部，连接凸部与安装孔相配合，且连接凸部的顶端面不超出第一表面。
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二次电池分解结构示意图；
图2是本申请另一实施例的二次电池分解结构示意图；
图3是本申请一实施例的顶压板的结构示意图；
图4是本申请一实施例的顶压板和绝缘构件的连接状态示意图；
图5是图4中A处局部放大图；
图6是本申请一实施例的绝缘构件和顶盖片的连接状态示意图；
图7是图6中B处局部放大图；
图8是本申请一实施例的二次电池的局部剖视结构示意图；
图9是本申请一实施例的二次电池的制造方法流程图。
在附图中，附图并未按照实际的比例绘制。
标记说明：
10、壳体；
20、电极组件；201、主体部；202、极耳；202a、连接端；202b、中间段；202c、自由端；
30、顶盖片；
40、电极端子；
50、绝缘构件；50a、第一绝缘体；50b、第二绝缘体；501、连接凸部；501a、顶端面；502、弹性支脚；
60、顶压板；600a、第一表面；600b、第二表面；60a、第一端部；60b、第二端部；601、安装孔；601a、连接孔段；601b、容纳孔段；602、容纳槽；
70、转接片；
X、长度方向；Y、宽度方向。
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9对本申请实施例的二次电池进行详细描述。
参见图1所示，本申请实施例的二次电池包括壳体10、设置于壳体10内的电极组件20及与壳体10密封连接的顶盖组件。
本实施例的壳体10可具有六面体形状或其他形状。本实施例的壳体10具有容纳电极组件20和电解液的内部空间。本实施例的壳体10可以由例如铝或铝合金等材料制造。本实施例的顶盖组件包括顶盖片30以及设置于顶盖片30上的电极端子40。顶盖组件通过顶盖片30与壳体10密封连接。本实施例的顶盖片30具有预定长度和宽度。
继续参见图2所示，本申请实施例的电极组件20包括主体部201以及连接于主体部201的极耳202。电极组件20通过极耳202连接于电极端子40。本实施例中，通过将第一极片、第二极片以及隔离膜一同围绕卷绕轴线螺旋卷绕而形成主体部201。其中，隔离膜是介于第一极片和第二极片之间的绝缘体。本实施例的主体部201整体为扁平状结构，其具有预定的厚度、高度和宽度。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，正极片活性物质被涂覆在正极片的涂覆区上，而负极片活性物质被涂覆到负极片的涂覆区上。由主体部201的涂覆区延伸出的多个未涂覆区层叠设置，则多个层叠设置的未涂覆区作为极耳202。电极组件20包括两个极耳202，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。
本实施例的顶盖组件还包括绝缘构件50。绝缘构件50设置于顶盖片30与主体部201之间。绝缘构件50具有朝主体部201延伸的连接凸部501。绝缘构件50能够与顶盖片30连接固定。绝缘构件50用于物理绝缘隔离顶盖片30与电极组件20所包括的主体部201。
本实施例的二次电池还包括顶压板60。顶压板60设置于绝缘构件50与主体部201之间。顶压板60具有朝向主体部201的第一表面600a以及背向主体部201的第二表面600b。第一表面600a和第二表面600b沿顶压板60自身厚度方向相对设置。顶压板60的厚度方向与顶盖片30的厚度 方向相同。第一表面600a和第二表面600b沿二次电池的高度方向(与长度方向X和宽度方向Y均垂直的方向)相对设置。完成组装后的二次电池，顶压板60的第一表面600a能够对主体部201施加抵压应力，以通过主体部201对整个电极组件20形成限位，避免电极组件20在壳体10内上下移动。顶压板60具有安装孔601。安装孔601从第二表面600b朝第一表面600a延伸。绝缘构件50所包括的连接凸部501与安装孔601相配合，以使绝缘构件50和顶压板60两者彼此连接固定。绝缘构件50所包括的连接凸部501具有朝向主体部201的顶端面501a。连接凸部501的顶端面501a不超出顶压板60的第一表面600a。
根据本申请实施例的二次电池，其包括壳体10、电极组件20、顶盖组件以及顶压板60。壳体10和顶盖组件密封连接以将电极组件20封闭于壳体10内。顶压板60设置于壳体10内，并且顶压板60能够固定电极组件20。由于在绝缘构件50和电极组件20的主体部201之间设置顶压板60，从而通过顶压板60对电极组件20进行限位固定，保证电极组件20在壳体10的位置稳定，降低由于主体部201发生窜动而导致极耳202频繁弯折发生断裂的可能性，提升二次电池的使用安全性。另外，顶盖组件所包括的绝缘构件50自身具有连接凸部501，而顶压板60具有安装孔601。绝缘构件50的连接凸部501与顶压板60的安装孔601相连接，从而顶压板60的位置受到绝缘构件50的限制和约束，不会在壳体10内发生移动，进而在二次电池组装过程中，顶压板60不会出现因自身移动而损伤主体部201所包括的极片或隔离膜的情况。由于绝缘构件50的连接凸部501不超过顶压板60的第一表面600a，因此连接凸部501的顶端面501a不会对主体部201施加压应力，从而降低绝缘构件50的连接凸部501对主体部201所包括的极片或隔离膜造成局部挤压损伤的可能性，提高二次电池的安全性。
参见图3所示，本实施例的顶压板60所包括的安装孔601为贯通孔。贯通孔从第二表面600b贯通至第一表面600a。安装孔601包括连接孔段601a以及与连接孔段601a相连通的容纳孔段601b。容纳孔段601b的孔径大于连接孔段601a，以减小连接孔段601a的长度，从而改善装配 过程中因连接孔段601a的制造误差对连接凸部501的影响。。容纳孔段601b靠近主体部201，其开口朝向主体部201，而连接孔段601a靠近绝缘构件50。本实施例的连接凸部501与连接孔段601a相连接，以使绝缘构件50和顶压板60连接固定。连接凸部501穿过连接孔段601a，且顶端面501a位于容纳孔段601b内或与顶压板60朝向主体部201的第一表面600a相齐平。由于顶压板60的第一表面600a用于对主体部201施加压应力，因此不超出顶压板60第一表面600a的连接凸部501所包括的顶端面501a不会对主体部201施加应力，从而连接凸部501不会对主体部201所包括的极片和/或隔离膜造成局部挤压损伤。
本实施例的连接凸部501与连接孔段601a插接连接，且连接凸部501与连接孔段601a过盈配合。连接凸部501与连接孔段601a通过过盈配合的方式实现连接，能够保证连接凸部501与顶压板60连接稳定，同时减少零部件的使用数量，并且连接凸部501与连接孔段601a能够实现快速连接，组装效率高。
参见图6和图7所示，本实施例的连接凸部501包括两个间隔设置的弹性支脚502。每个弹性支脚502的外表面的形状与连接孔段601a的孔壁形状相匹配，且外表面抵压于孔壁。在连接凸部501插入安装孔601的过程中，两个弹性支脚502能够收缩以容易地进入连接孔段601a内，并且在安装至预定位置后，弹性支脚502在自身弹性回复力的作用下能够对连接孔段601a的孔壁施加更大的压应力，从而增加连接凸部501和连接孔段601a的孔壁之间的摩擦力，使得连接凸部501和顶压板60连接更加稳定可靠。在一个示例中，弹性支脚502的顶端具有卡钩。弹性支脚502的顶端穿过连接孔段601a后，卡钩能够卡接于连接孔段601a和容纳孔段601b之间的台阶面上，从而弹性支脚502不易从安装孔601脱出，进一步提升连接凸部501和顶压板60的连接稳定性。
在一个实施例中，连接孔段601a的横截面为圆形，而容纳孔段601b的横截面为矩形。每个弹性支脚502的横截面为五分之一圆至二分之一圆的扇形形状。
本实施例的顶压板60包括沿顶压板60自身的长度方向相对设置的第 一端部60a和第二端部60b。顶压板60的长度方向与顶盖片30的长度方向X相同。第一端部60a和第二端部60b均设置有安装孔601。连接凸部501的数量和位置与安装孔601的数量和位置均一一对应。通过在顶压板60的两个端部同时设置安装孔601，同时在绝缘构件50上对应地设置连接凸部501，能够增加绝缘构件50和顶压板60的连接点数量，进一步有效提升连接凸部501和顶压板60的连接稳定性，降低顶压板60发生移动的可能性。
本实施例的顶压板60上设置于第一端部60a的容纳孔段601b的孔径小于设置于第二端部60b的容纳孔段601b的孔径，从而使得顶压板60具有防呆功能，避免组装过程中将顶压板60错误安装，有效提高组装过程的效率和准确性。
本实施例的顶压板60所包括的第一端部60a设置有两个安装孔601。两个安装孔601沿间隔设置，从而当两个连接凸部501与两个安装孔601完成配合后，能够阻止顶压板60转动，避免顶压板60转动而刮伤主体部201。顶压板60的宽度方向与顶盖片30的宽度方向Y相同。进一步地，顶压板60所包括的第二端部60b设置有两个安装孔601。两个安装孔601沿顶盖片30的宽度方向Y间隔设置。这样，顶压板60的第一端部60a和第二端部60b均受到约束，从而使得顶压板60整体不会发生转动，避免顶压板60转动而刮伤主体部201。
参见图6所示，本实施例的绝缘构件50包括第一绝缘体50a和第二绝缘体50b。第一绝缘体50a和第二绝缘体50b沿顶盖片30的长度方向X间隔设置。第一绝缘体50a和第二绝缘体50b均设置有连接凸部501。第一绝缘体50a和第二绝缘体50b之间形成让位间隙。顶盖片30上具有与该让位间隙相对应设置的防爆阀。在二次电池内部压力过大，防爆阀被打开时，气流能够通过让位间隙和打开的防爆阀顺利快速地排出。另外，绝缘构件50采用分体式结构能够减轻自身整体重量，有利于提高二次电池的能量密度。
参见图8所示，本实施例的二次电池还包括转接片70，极耳202具有远离主体部201的自由端202c、与主体部201相连接的连接端202a以及 连接自由端202c和连接端202a的中间段202b。自由端202c通过转接片70与电极端子40相连接。在一个示例中，自由端202c与转接片70焊接连接。顶压板60具有容纳槽602。容纳槽602从第二表面600b朝第一表面600a凹陷形成。自由端202c和转接片70均被容纳于容纳槽602。这样，一方面，极耳202、转接片70和顶压板60三者的总体高度较小，有效节省壳体10的内部空间，有利于提高二次电池的能量密度；另一方面，由于极耳202通过焊接的方式与转接片70连接固定，因此当二次电池在组装过程中或使用过程中，焊接区域产生焊渣时，顶压板60的容纳槽602能够收集焊渣以有效阻止焊渣掉落至主体部201上，降低焊渣刺破主体部201所包括的极片或隔离膜的可能性，提升二次电池的安全性；再一方面，本实施例的顶压板60能够将极耳202与转接片70的焊接区域与主体部201物理隔离。
本申请实施例的二次电池，其包括能够对电极组件20所包括的主体部201施加压应力的顶压板60。顶压板60能够对主体部201进行有效约束和限制，避免主体部201在壳体10内上下移动，从而保证电极组件20在壳体10的位置稳定，降低由于主体部201发生窜动而导致极耳202频繁弯折发生断裂的可能性，提升二次电池的使用安全性。另外，顶盖组件所包括的绝缘构件50自身具有连接凸部501，而顶压板60具有安装孔601。绝缘构件50的连接凸部501与顶压板60的安装孔601相连接，从而顶压板60的位置受到绝缘构件50的限制和约束，不会在壳体10内发生移动，降低在二次电池组装过程中，发生移动的顶压板60会损伤主体部201所包括的极片或隔离膜。由于绝缘构件50的连接凸部501不超过顶压板60的第一表面600a，因此连接凸部501的顶端面501a不会对主体部201施加压应力，从而降低绝缘构件50的连接凸部501对主体部201所包括的极片或隔离膜造成局部挤压损伤的可能性，提高二次电池的安全性。
参见图9所示，本申请实施例提出了一种二次电池的制造方法，其中，包括：
将顶盖片30放置于预定装配工位；
将电极端子40安装于顶盖片30；
组装电极组件20，电极组件20包括主体部201以及连接于主体部201的极耳202，将极耳202连接于电极端子40；
组装绝缘构件50，绝缘构件50具有连接凸部501，将绝缘构件50设置于顶盖片30和主体部201之间，并且使连接凸部501朝向主体部201；
组装顶压板60，顶压板60具有第一表面600a和安装孔601，将顶压板60设置于绝缘构件50与主体部201之间，并且使得第一表面600a朝向主体部201，连接凸部501与安装孔601相配合，且连接凸部501的顶端面501a不超出第一表面600a。
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. 一种顶压板，用于二次电池，其中，所述二次电池包括顶盖片、电极端子和绝缘构件，所述电极端子设置于所述顶盖片，所述电极组件包括主体部以及连接于所述主体部的极耳，所述极耳连接于所述电极端子，所述绝缘构件设置于所述顶盖片与所述主体部之间，所述绝缘构件具有朝所述主体部延伸的连接凸部，所述顶压板包括：
    沿自身厚度方向相对设置的第一表面和第二表面以及从所述第二表面朝所述第一表面延伸的安装孔；
    所述顶压板能够设置于所述绝缘构件与所述主体部之间，所述第一表面朝向所述主体部，所述连接凸部能够与所述安装孔相配合，且所述连接凸部的顶端面不超出所述第一表面。
  2. 根据权利要求1所述的顶压板，其中：
    所述安装孔为贯通孔，所述安装孔包括连接孔段以及与所述连接孔段相连通的容纳孔段。
  3. 根据权利要求2所述的顶压板，其中，所述顶压板包括沿所述顶压板的长度方向相对设置的第一端部和第二端部，所述第一端部和所述第二端部均设置有所述安装孔。
  4. 根据权利要求3所述的顶压板，其中，设置于所述第一端部的所述容纳孔段的孔径小于设置于所述第二端部的所述容纳孔段的孔径。
  5. 根据权利要求3所述的顶压板，其中，所述第一端部设置有两个所述安装孔，两个所述安装孔沿所述顶压板的宽度方向间隔设置；和/或，所述第二端部设置有两个所述安装孔，两个所述安装孔沿所述顶压板的宽度方向间隔设置。
  6. 一种二次电池，其中，包括：
    顶盖片；
    电极端子，所述电极端子设置于所述顶盖片上；
    电极组件，所述电极组件包括主体部以及连接于所述主体部的极耳，所述极耳连接于所述电极端子；
    绝缘构件，设置于所述顶盖片与所述主体部之间，所述绝缘构件具有朝所述主体部延伸的连接凸部；
    顶压板，所述顶压板设置于所述绝缘构件与所述主体部之间，所述顶压板具有朝向所述主体部的第一表面，所述顶压板具有安装孔，所述连接凸部与安装孔相配合，且所述连接凸部的顶端面不超出所述第一表面。
  7. 根据权利要求6所述的二次电池，其中：
    所述安装孔为贯通孔，所述安装孔包括连接孔段以及与所述连接孔段相连通的容纳孔段，所述容纳孔段的开口朝向所述主体部；
    所述连接凸部与所述连接孔段相连接，以使所述绝缘构件和所述顶压板连接固定，所述连接凸部穿过所述连接孔段，且所述顶端面位于所述容纳孔段内或与所述第一表面相齐平。
  8. 根据权利要求7所述的二次电池，其中，所述连接凸部与所述连接孔段插接连接，所述连接凸部与所述连接孔段过盈配合。
  9. 根据权利要求8所述的二次电池，其中，所述连接凸部包括两个间隔设置的弹性支脚，每个所述弹性支脚的外表面的形状与所述连接孔段的孔壁形状相匹配，且所述外表面抵压于所述孔壁。
  10. 根据权利要求7至9任一项所述的二次电池，其中，所述顶压板包括沿所述顶盖片的长度方向相对设置的第一端部和第二端部，所述第一端部和所述第二端部均设置有所述安装孔，所述连接凸部的数量和位置与所述安装孔的数量和位置均一一对应。
  11. 根据权利要求10所述的二次电池，其中，设置于所述第一端部的所述容纳孔段的孔径小于设置于所述第二端部的所述容纳孔段的孔径。
  12. 根据权利要求10所述的二次电池，其中，所述第一端部设置有两个所述安装孔，两个所述安装孔沿所述顶盖片的宽度方向间隔设置。
  13. 根据权利要求10所述的二次电池，其中，所述第二端部设置有两个所述安装孔，两个所述安装孔沿所述顶盖片的宽度方向间隔设置。
  14. 根据权利要求6至9任一项所述的二次电池，其中，所述绝缘构件包括第一绝缘体和第二绝缘体，所述第一绝缘体和所述第二绝缘体沿所述顶盖片的长度方向间隔设置，所述第一绝缘体和所述第二绝缘体均设置 有所述连接凸部。
  15. 根据权利要求6至9任一项所述的二次电池，其中，所述二次电池还包括转接片，所述极耳具有远离所述主体部的自由端，所述自由端通过所述转接片与所述电极端子相连接，所述顶压板具有容纳槽，所述自由端和所述转接片均被容纳于所述容纳槽。
  16. 一种二次电池的制造方法，其中，包括：
    将顶盖片放置于预定装配工位；
    将电极端子安装于顶盖片；
    组装电极组件，所述电极组件包括主体部以及连接于所述主体部的极耳，将所述极耳连接于所述电极端子；
    组装绝缘构件，所述绝缘构件具有连接凸部，将所述绝缘构件设置于所述顶盖片和所述主体部之间，并且使所述连接凸部朝向所述主体部；
    组装顶压板，所述顶压板具有第一表面和安装孔，将所述顶压板设置于所述绝缘构件与所述主体部之间，并且使得所述第一表面朝向所述主体部，所述连接凸部与安装孔相配合，且所述连接凸部的顶端面不超出所述第一表面。
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US20200411897A1 (en) 2020-12-31

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