WO2020088239A1 - 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
WO2020088239A1
WO2020088239A1 PCT/CN2019/111200 CN2019111200W WO2020088239A1 WO 2020088239 A1 WO2020088239 A1 WO 2020088239A1 CN 2019111200 W CN2019111200 W CN 2019111200W WO 2020088239 A1 WO2020088239 A1 WO 2020088239A1
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WO
WIPO (PCT)
Prior art keywords
pressing plate
secondary battery
top pressing
top cover
main body
Prior art date
Application number
PCT/CN2019/111200
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 US16/964,318 priority Critical patent/US20210043912A1/en
Priority to ES19878366T priority patent/ES2911111T3/es
Priority to EP19878366.4A priority patent/EP3723154B1/en
Publication of WO2020088239A1 publication Critical patent/WO2020088239A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat 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
    • H01M50/147—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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/155—Lids or covers characterised by the material
    • H01M50/164—Lids or covers characterised by the material having a layered structure
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/308—Detachable arrangements, e.g. detachable vent plugs or plug systems
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/383—Flame arresting or ignition-preventing means
    • 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
    • H01M50/543—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
    • 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
    • H01M50/557—Plate-shaped terminals
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • 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 coated area of the positive electrode sheet;
  • the coating area of the negative electrode sheet extends.
  • 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 pressure plate When the top pressure plate is applied to the secondary battery, it can press the body part, thereby restricting the position of the body part in the case, effectively preventing the body part from moving in the case, and thereby avoiding the occurrence of pole folds due to the movement of the body part Bending breaks.
  • an embodiment of the present application provides a top pressing plate for a secondary battery.
  • the secondary battery includes a top cover sheet, an insulating separator connected to the top cover sheet, and an electrode assembly.
  • the electrode assembly includes a main body portion and a main body portion
  • the connected lugs have welding ends
  • the top pressure plate includes: a first surface and a second surface oppositely arranged along the thickness direction of the body, and a receiving groove recessed from the second surface toward the first surface; Between the separator and the main body, the first surface faces the main body and the second surface faces the insulating partition, and the receiving groove is used to receive the welding end.
  • the accommodating groove penetrates the top pressing plate along the width direction of the top pressing plate.
  • the top pressing plate has a first boss, and the number of the accommodating grooves is two, and the two accommodating grooves are respectively disposed on both sides of the first boss along the length 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 is provided between the top cover sheet and the body part 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.
  • the top pressing plate can isolate the welding end of the tab from the main body part to avoid the welding area on the welding end from scratching or abrading the main body part.
  • an embodiment of the present application proposes a secondary battery, including:
  • An electrode assembly which includes a main body and a tab connected to the main body, the tab has a connecting end, a welding end, and an intermediate section connecting the connecting end and the welding end, the connecting end is connected to the main body;
  • the top cover assembly the top cover The assembly includes a top cover sheet and an insulating spacer connected to the top cover sheet; a top pressing plate is disposed between the insulating spacer and the main body, the top pressing plate has a first surface facing the main body and a second facing the insulating spacer The surface and the receiving groove recessed from the second surface toward the first surface, the welding end is received in the receiving groove.
  • the accommodating groove penetrates the top pressing plate.
  • the depth of the receiving groove is greater than or equal to the thickness of the welding end.
  • the top pressing plate has a first boss, and the number of the accommodating grooves is two, and the two accommodating grooves are respectively disposed on both sides of the first boss along the length direction of the top cover piece.
  • the insulating spacer includes a first insulator and a second insulator, the first insulator and the second insulator are spaced apart along the length to form a yield gap, and the first boss corresponds to the yield gap Settings.
  • the first insulator and the second insulator each have a second boss, the second boss abuts against the bottom of the receiving groove and the thickness of the second boss is greater than or equal to the depth of the receiving groove.
  • the top cover assembly further includes an explosion-proof valve, and the explosion-proof valve is provided on the top cover piece and corresponding to the first boss, and the first boss has an overflow hole corresponding to the explosion-proof valve.
  • the insulating spacer has an accommodating recess recessed away from the main body, and the top pressing plate and the welding end are accommodated in the accommodating recess.
  • the secondary battery further includes an adapter sheet, the adapter sheet is in a flat plate shape, the welding end is welded to the adapter sheet, and the adapter sheet is at least partially accommodated in the accommodating groove.
  • the top pressing plate has a first clamping portion
  • the insulating spacer has a second clamping portion
  • the first clamping portion and the second clamping portion are clamped and connected, wherein the first clamping One of the part and the second clamping part is a clamping hole, and the other is a clamping leg.
  • an embodiment of the present application provides a method for manufacturing a secondary battery, including:
  • the top cover assembly includes a top cover piece and an insulating spacer connected to the top cover piece;
  • the electrode assembly includes a main body portion and a tab connected to the main body portion.
  • the tab has a connecting end, a welding end, and an intermediate section connecting the connecting end and the welding end, connecting the connecting end to the main body portion.
  • the welding end is welded to the top cover assembly, and the welding end and the top cover piece are insulated and insulated by an insulating spacer;
  • the top pressing plate has a first surface, a second surface, and a receiving groove recessed from the second surface toward the first surface, cover the welding end with the top pressing plate, and then adjust the position of the electrode assembly so that the top pressing plate is located on the insulating separator And the main body, with the first surface facing the main body and the second surface facing the insulating spacer, the welding end is accommodated in the accommodating groove.
  • 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 an exploded schematic view of an insulating spacer, an adapter piece, and a top pressing plate according to an embodiment of the present application;
  • FIG. 4 is a schematic diagram of a partial cross-sectional structure of a secondary battery according to an embodiment of the present application.
  • FIG. 5 is a partial enlarged view at A in FIG. 4;
  • FIG. 6 is a partial cross-sectional structural diagram of a secondary battery according to another embodiment of the present application.
  • FIG. 7 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, tab; 202a, connecting end; 202b, middle section; 202c, welding end;
  • Top cover assembly 401, top cover sheet; 402, electrode terminal; 403, insulating separator; 403a, first insulator; 403b, second insulator; 403c, yield gap; 403d, receiving recess; 403e, lower surface ; 403f, second clamping part; 403g, second boss; 404, explosion-proof valve;
  • Top platen; 501 first surface; 502, second surface; 503, first end; 504, second end; 505, receiving groove; 506, first boss; 506a, overflow hole; 507 , Side surface; 508, the first clamping part;
  • X length direction
  • Y thickness direction
  • Z 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 of the embodiment of the present application includes a case 10, an electrode assembly 20 disposed in the case 10, and a top cover assembly 40 that is hermetically 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 electrode assembly 20 of this embodiment includes a body portion 201 and a tab 202 connected to the body portion 201.
  • 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 electrode assembly 20 of the present 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, and the second pole piece is the negative electrode piece.
  • the first pole piece may also be a negative pole piece, and 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 coated area of the main body portion 201 are stacked to form a tab 202.
  • the electrode assembly 20 includes two tabs 202, namely a positive tab and a negative tab.
  • the positive tab extends from the coated area of the positive electrode sheet Out
  • the negative electrode ear extends from the coating area of the negative electrode sheet.
  • the tab 202 in this embodiment includes a connecting end 202a, a welding end 202c, and an intermediate section 202b for connecting the connecting end 202a and the welding end 202c.
  • the connecting end 202 a included in the pole lug 202 is connected to the main body 201.
  • the cap assembly 40 of the embodiment of the present application includes a cap sheet 401, an electrode terminal 402, and an insulating separator 403.
  • the top cover sheet 401 of this embodiment is hermetically connected to the casing 10 to seal the electrode assembly 20 inside the casing 10.
  • the top cover piece 401 of this embodiment has an explosion-proof valve 404. When the internal pressure of the secondary battery is too large, the explosion-proof valve 404 can burst to release the internal pressure, reducing the possibility of the secondary battery exploding.
  • the top cover sheet 401 of this embodiment has an electrode extraction hole.
  • the electrode terminal 402 of this embodiment is disposed on the top cover sheet 401 and corresponding to the electrode extraction hole.
  • the tab 202 included in the electrode assembly 20 is electrically connected to the electrode terminal 402.
  • the welding end 202c of the tab 202 may be directly welded to the electrode terminal 402.
  • the secondary battery further includes an adapter.
  • the welding end 202c of the tab 202 is welded to the adapter piece, so that the welding end 202c of the tab 202 is connected to the electrode terminal 402 through the adapter piece.
  • the top cover sheet 401 of this embodiment is a conductive material.
  • the insulating separator 403 is used to isolate the top cover sheet 401 and the electrode assembly 20 to avoid direct contact between the two.
  • the secondary battery of this embodiment further includes a top pressing plate 50.
  • the pressing plate 50 is provided between the insulating spacer 403 and the main body 201.
  • the pressing plate 50 has a first surface 501 facing the main body portion 201, a second surface 502 facing the insulating spacer 403, and a receiving groove 505 recessed from the second surface 502 toward the first surface 501.
  • the welding end 202c of the tab 202 is located between the top pressing plate 50 and the insulating spacer 403 and is accommodated in the accommodating groove 505.
  • the top pressing plate 50 can apply a predetermined pressure to the main body portion 201 of the electrode assembly 20 to restrict the vertical movement of the electrode assembly 20, so that when the entire secondary battery vibrates It can reduce the vertical movement of the main body 201 of the electrode assembly 20 in the casing 10 to a certain extent, and the tab 202 of the electrode assembly 20 will not be frequently bent and broken, effectively improving the use of secondary batteries safety.
  • the top pressing plate 50 is provided between the insulating separator 403 and the main body 201 of the electrode assembly 20, the electrode assembly 20 is fixed by the top pressing plate 50 to ensure that the electrode assembly 20 is in the case The position of is stable, reducing the possibility of the tab 202 breaking due to the movement of the main body 201, and improving the safety of use of the secondary battery.
  • an accommodation groove 505 having an accommodation function is provided on the top pressing plate 50.
  • the welding end 202c of the pole lug 202 is accommodated in the accommodating groove 505, so that, on the one hand, in the thickness direction Y of the top cover piece 401, the thickness of both the welding end 202c and the top pressing plate 50 is smaller, effectively saving
  • the internal space of the casing 10 effectively improves the energy density of the secondary battery; on the other hand, since the welding end 202c of the tab 202 is connected and fixed to the electrode terminal 402 or the adapter by welding, when the secondary battery is assembled In the process or during use, when welding slag is generated in the welding area, the accommodating groove 505 of the top pressing plate 50 can collect the welding slag to effectively prevent the welding slag from falling onto the body portion 201, and effectively reduce the welding slag from puncturing the body portion 201
  • the possibility of a pole piece or a separator improves the safety of the secondary battery; on the other hand, the top pressing plate 50 of this embodiment can physically isolate the welding area of the welding end 202c from the main body 201.
  • the welding area will not touch the main body portion 201, reducing the possibility of the main body portion 201 being damaged by the welding area due to scratching or abrasion, and improving the use safety of the secondary battery
  • the accommodating groove 505 is not provided, that is, the second surface 502 of the top pressing plate 50 is a flat surface, at this time, both ends of the top pressing plate 50 are pressed against by the welding end 202c, and the middle portion of the top pressing plate 50 is in a suspended state.
  • the main body 201 exerts upward force on the top pressing plate 50. At this time, both ends of the top pressing plate 50 warp, which affects the stability of the top pressing plate 50.
  • the secondary battery has an adapter sheet 30.
  • the adapter piece 30 of this embodiment is in the shape of a flat plate, so that it takes up less space in the thickness direction Y, making the structure more compact.
  • the welding end 202c of the pole lug 202 is welded to the adapter piece 30.
  • the adapter piece 30 is at least partially accommodated in the accommodating groove 505.
  • the thickness direction Y of the top cover sheet 401 the structure of the adapter sheet 30, the welding end 202c of the tab 202, and the top pressing plate 50 are more compact, which effectively saves the internal space of the housing 10, and is beneficial to increase the energy density of the secondary battery.
  • the insulating spacer 403 of this embodiment has an accommodating recess 403d recessed away from the main body 201. Both the pressing plate 50 and the welding end 202c are accommodated in the accommodating recess 403d. In the thickness direction Y of the top cover sheet 401, the insulating spacer 403, the welding end 202c of the tab 202, and the top pressing plate 50 are compact, which further saves the internal space of the case 10 and effectively improves the energy density of the secondary battery. In one embodiment, the second surface 502 of the top pressing plate 50 abuts the bottom of the receiving recess 403d.
  • the secondary battery includes an adaptor 30.
  • the welding end 202c is connected to the electrode terminal 402 through the adapter piece 30.
  • the welding end 202c is located between the adapter piece 30 and the top pressing plate 50.
  • the top pressing plate 50, the welding end 202c, and the adapter piece 30 are all accommodated in the accommodating recess 403d.
  • the first surface 501 of the top pressing plate 50 protrudes from the lower surface 403e of the insulating spacer 403 toward the main body portion 201, thereby making the insulating spacer 403
  • the lower surface 403e is not in contact with the body portion 201, which reduces the possibility that the insulating spacer 403 locally applies excessive compressive stress to the body portion 201 to cause damage to the body portion 201.
  • the top pressing plate 50 of this embodiment has a first clamping portion 508.
  • the insulating spacer 403 has a second engaging portion 403f.
  • the first engaging portion 508 of the top pressing plate 50 and the second engaging portion 403f of the insulating spacer 403 are engaged with each other, so that the top pressing plate 50 and the insulating spacer 403 are quickly and conveniently connected and fixed.
  • the first clamping portion 508 and the second clamping portion 403f can be positioned with each other, which is helpful to reduce the difficulty of connecting the two and achieve rapid assembly, and also to ensure that the position of the top pressure plate 50 is stable during the installation process .
  • the top pressing plate 50 is less likely to shake along the longitudinal direction X of the top cover piece 401 and scratch the welding end 202c.
  • the first clamping portion 508 is a clamping hole
  • the second clamping portion 403f is a clamping leg. Understandably, the first clamping portion 508 may be a clamping leg, and the second clamping portion 403f may be a clamping hole.
  • the connecting end 202 a of the tab 202 of this embodiment is located below the top pressing plate 50, the middle section 202 b bypasses the top pressing plate 50, and the welding end 202 c is located in the receiving groove 505 Inside.
  • the accommodating groove 505 included in the top pressing plate 50 of this embodiment penetrates the top pressing plate 50.
  • the width direction of the top pressing plate 50 is the same as the width direction Z of the top cover piece 401.
  • the top pressing plate 50 of this embodiment has two side surfaces 507 opposed in the width direction Z.
  • the receiving groove 505 penetrates from one side surface 507 to the other side surface 507 to form a through groove.
  • the number of electrode assemblies 20 is two.
  • the two electrode assemblies 20 are arranged side by side in the width direction Z. In this way, the tab 202 of one electrode assembly 20 bypasses the top pressing plate 50 from one side of the top pressing plate 50, the welding end 202c included therein is in the receiving groove 505, and the other electrode assembly 20 from the other side of the top pressing plate 50 Bypassing the top pressing plate 50, the welding end 202c included therein is in the receiving groove 505.
  • the shape of the side surface 507 is arc-shaped, so that when the middle section 202b of the pole lug 202 bypasses the top pressure plate 50, the contact area between the side surface 507 and the side surface 507 is large, and the fit is better, thereby making the top
  • the force exerted by the pressing plate 50 on the middle section 202b is more balanced, reducing the possibility of the middle section 202b being pressed or scratched by the side of the top pressing plate 50 and causing damage.
  • the depth of the receiving groove 505 of this embodiment is greater than or equal to the thickness of the welding end 202c.
  • the entire welding end 202c is accommodated in the accommodating groove 505.
  • the total thickness value of both the welding end 202c and the top pressing plate 50 is further reduced, and the occupation rate of the internal space of the casing 10 is reduced, which is conducive to further improving the energy density of the secondary battery; on the other hand, the secondary After the battery is assembled, the insulating separator 403 will directly contact the top pressing plate 50 and be supported by the top pressing plate 50 so that the insulating separator 403 will not exert a pressing force on the welding end 202c.
  • the top pressing plate 50 of this embodiment has a first end 503, a second end 504 and a first boss 506.
  • the first end portion 503 and the second end portion 504 are oppositely arranged along the longitudinal direction of the pressing plate 50.
  • the longitudinal direction of the top pressing plate 50 is the same as the longitudinal direction X of the top cover piece 401.
  • the first boss 506 is disposed between the first end 503 and the second end 504 and is located in the middle of the top platen 50.
  • the number of the holding groove 505 is two.
  • the two accommodating grooves 505 are respectively provided on both sides of the first boss 506 along the length direction X.
  • the first boss 506 separates the two tabs 202.
  • the positions of the two tabs 202 of each electrode assembly 20 correspond to the positions of the two accommodating grooves 505, so that each accommodating groove 505 accommodates two of the two electrode assemblies 20 at the same time. ⁇ ⁇ 202.
  • the two sides of the first boss 506 each have two tabs 202. In the thickness direction Y, the thickness of the middle portion where the first boss 506 is provided on the top pressing plate 50 is greater than the thickness of the portion where the receiving groove 505 is provided.
  • the middle portion of the top pressure plate 50 where the first boss 506 is provided has high rigidity, and is not easily bent or deformed under stress, thereby reducing the excessive pressure stress applied to the main body portion 201 due to the middle portion of the top pressure plate 50 bending. This may cause damage to the main body 201.
  • the insulating spacer 403 includes a first insulator 403a and a second insulator 403b.
  • the first insulator 403a and the second insulator 403b are arranged at intervals in the longitudinal direction X.
  • a yield gap 403c is formed between the first insulator 403a and the second insulator 403b.
  • the first boss 506 of the top pressing plate 50 is corresponding to the yield gap 403c.
  • the top cover piece 401 has an explosion-proof valve 404 corresponding to the yield gap 403c.
  • the first boss 506 is provided with an overflow hole 506a corresponding to the yield gap 403c.
  • the airflow can be smoothly and quickly discharged through the overflow hole 506a, the clearance gap 403c, and the opened explosion-proof valve 404.
  • a part of the first boss 506 may extend into the yield gap 403c, thereby further saving the internal space of the case 10, which is beneficial to increase the energy density of the secondary battery.
  • the first insulator 403a and the second insulator 403b of this embodiment each have a second boss 403g.
  • the second boss 403g abuts against the bottom of the receiving groove 505.
  • the second boss 403g will support the top pressing plate 50.
  • the insulating spacer 403 can prevent the top platen 50 from warping toward the top cover sheet 401, so that the first surface 501 of the top platen 50 can maintain a good contact with the main body 201
  • the compressive stress applied by the main body 201 maintains a balanced state.
  • the thickness of the second boss 403g is greater than or equal to the depth of the receiving groove 505, so that the second boss 403g can be pressed against the bottom of the receiving groove 505.
  • the insulating spacer 403 and the top pressing plate 50 are connected to each other by a first clamping portion 508 and a second clamping portion 403f.
  • the connection position formed by the first clamping portion 508 and the second clamping portion 403f and the second boss 403g form two fulcrums, which effectively improves the positional stability of the insulating spacer 403.
  • a top pressing plate 50 is provided between the top cover sheet 401 and the main body 201 of the electrode assembly 20.
  • the top pressing plate 50 can press the main body 201, thereby restricting the position of the main body 201 in the housing 10, effectively preventing the main body 201 from moving in the housing 10, and thereby avoiding the occurrence of extremes due to the main body 201
  • the case of the ear 202 is bent and broken to improve the safety of the secondary battery.
  • the pressing plate 50 can isolate the welding end 202c of the tab 202 from the main body portion 201 to avoid the welding area on the welding end 202c from scratching or abrading the main body portion 201.
  • the top pressing plate 50 of this embodiment has a receiving groove 505.
  • the middle section 202b of the pole lug 202 bypasses the top pressing plate 50, so that the welding end 202c is located in the receiving groove 505, so that the thickness of the welding end 202c and the top pressing plate 50 is smaller in the thickness direction Y of the top cover piece 401, saving shell
  • the internal space of the body 10 is beneficial to increase the energy density of the secondary battery.
  • an embodiment of the present application provides a method for manufacturing a secondary battery, which includes:
  • the top cover assembly 40 includes a top cover piece 401 and an insulating spacer 403 connected to the top cover piece 401;
  • the electrode assembly 20 includes a body portion 201 and a tab 202 connected to the body portion 201.
  • the tab 202 has a connecting end 202a, a welding end 202c, and a connecting end 202a and a welding end 202c
  • the middle section 202b connects the connecting end 202a to the main body 201, welds the welding end 202c to the top cover assembly 40, and the welding end 202c and the top cover piece 401 are insulated and insulated by an insulating spacer 403;
  • the top pressing plate 50 which has a first surface 501, a second surface 502, and a receiving groove 505 recessed from the second surface 502 toward the first surface 501, cover the top pressing plate 50 with the welding end 202c, and then adjust the Position so that the top pressing plate 50 is located between the insulating spacer 403 and the main body 201, and the first surface 501 faces the main body 201 and the second surface 502 faces the insulating spacer 403, and the welding end 202c is received in the receiving groove 505.

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  • Electrochemistry (AREA)
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  • Manufacturing & Machinery (AREA)
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Abstract

一种顶压板（50）、二次电池以及二次电池的制造方法。顶压板（50）用于二次电池，二次电池包括顶盖片（401）、连接于顶盖片（401）的绝缘隔离件（403）以及电极组件（20），电极组件（20）包括主体部（201）以及与主体部（201）相连接的极耳（202），极耳（202）具有焊接端（202c），顶压板（50）包括：沿自身厚度方向相对设置的第一表面（501）和第二表面（502）以及从第二表面（502）朝第一表面（501）凹陷的容纳槽（505）；顶压板（50）能够设置于绝缘隔离件（403）和主体部（201）之间，第一表面（501）朝向主体部（201），第二表面（502）朝向绝缘隔离件（403），容纳槽（505）用于容纳焊接端（202c）。该顶压板（50）应用于二次电池时，顶压板（50）能够抵压电极组件（20）的主体部（201），从而限制主体部（201）在壳体（10）内的位置，有效阻止主体部（201）在壳体（10）内发生窜动，进而避免出现由于主体部（201）的窜动而导致极耳（202）折弯断裂的情况。

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201811278761.8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，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。
一方面，本申请实施例提出了一种顶压板，用于二次电池，二次电池包括顶盖片、连接于顶盖片的绝缘隔离件以及电极组件，电极组件包括主体部以及与主体部相连接的极耳，极耳具有焊接端，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凹陷的容纳槽；顶压板能够设置于绝缘隔离件和主体部之间，第一表面朝向主体部，第二表面朝向绝缘隔离件，容纳槽用于容纳焊接端。
根据本申请实施例的一个方面，沿顶压板的宽度方向，容纳槽贯穿顶压板。
根据本申请实施例的一个方面，顶压板具有第一凸台，容纳槽的数量为两个，两个容纳槽沿顶压板的长度方向分别设置于第一凸台的两侧。
根据本申请实施例的顶压板应用于二次电池时，顶压板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。另外，顶压板能够将极耳的焊接端与主体部隔离开，以避免焊接端上的焊接区域刮擦或磨损主体部。
另一方面，本申请实施例提出了一种二次电池，包括：
电极组件，电极组件包括主体部以及与主体部相连接的极耳，极耳具有连接端、焊接端以及连接连接端和焊接端的中间段，连接端与主体部相连接；顶盖组件，顶盖组件包括顶盖片以及连接于顶盖片的绝缘隔离件；顶压板，顶压板设置于绝缘隔离件和主体部之间，顶压板具有朝向主体部的第一表面、朝向绝缘隔离件的第二表面以及从第二表面朝第一表面凹陷的容纳槽，焊接端被容纳于容纳槽。
根据本申请实施例的另一个方面，沿顶盖片的宽度方向，容纳槽贯穿顶压板。
根据本申请实施例的另一个方面，沿顶盖片的厚度方向，容纳槽的深度大于或等于焊接端的厚度。
根据本申请实施例的另一个方面，顶压板具有第一凸台，容纳槽的数量为两个，两个容纳槽沿顶盖片的长度方向分别设置于第一凸台的两侧。
根据本申请实施例的另一个方面，绝缘隔离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长度方向间隔设置以形成让位间隙，第一凸台与让位间隙相对应设置。
根据本申请实施例的另一个方面，第一绝缘体和第二绝缘体均具有第二凸台，第二凸台抵靠于容纳槽的底部且第二凸台的厚度大于或等于容纳槽的深度。
根据本申请实施例的另一个方面，顶盖组件还包括防爆阀，防爆阀设置于顶盖片且与第一凸台相对应设置，第一凸台具有与防爆阀相对应的过流孔。
根据本申请实施例的另一个方面，绝缘隔离件具有远离主体部凹陷的容纳凹部，顶压板以及焊接端均被容纳于容纳凹部。
根据本申请实施例的一个方面，二次电池还包括转接片，转接片为平板状，焊接端与转接片焊接连接，转接片至少部分地被容纳于容纳槽。
根据本申请实施例的另一个方面，顶压板具有第一卡接部，绝缘隔离件具有第二卡接部，第一卡接部与第二卡接部卡接连接，其中，第一卡接部和第二卡接部中的一者为卡接孔，另一者为卡脚。
再一方面，本申请实施例提出了一种二次电池的制造方法，其包括：
将顶盖组件放置于预定装配工位，顶盖组件包括顶盖片以及连接于顶盖片的绝缘隔离件；
组装电极组件与顶盖组件，电极组件包括主体部以及与主体部相连接的极耳，极耳具有连接端、焊接端以及连接连接端和焊接端的中间段，将连接端与主体部相连接，将焊接端与顶盖组件焊接连接，焊接端与顶盖片通过绝缘隔离件绝缘隔离；
组装顶压板，顶压板具有第一表面、第二表面以及从第二表面朝第一表面凹陷的容纳槽，将顶压板覆盖焊接端，然后调整电极组件的位置，以使顶压板位于绝缘隔离件和主体部之间，并且第一表面朝向主体部、第二表面朝向绝缘隔离件，将焊接端容纳于容纳槽。
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的分解结构示意图；
图2是本申请另一实施例的二次电池的分解结构示意图；
图3是本申请一实施例的绝缘隔离件、转接片和顶压板的分解结构示意图；
图4是本申请一实施例的二次电池的局部剖视结构示意图；
图5是图4中A处局部放大图；
图6是本申请另一实施例的二次电池的局部剖视结构示意图；
图7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、焊接端；
30、转接片；
40、顶盖组件；401、顶盖片；402、电极端子；403、绝缘隔离件；403a、第一绝缘体；403b、第二绝缘体；403c、让位间隙；403d、容纳凹部；403e、下表面；403f、第二卡接部；403g、第二凸台；404、防爆阀；
50、顶压板；501、第一表面；502、第二表面；503、第一端部；504、第二端部；505、容纳槽；506、第一凸台；506a、过流孔；507、侧表面；508、第一卡接部；
X、长度方向；Y、厚度方向；Z、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7根据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以及与壳体10密封连接的顶盖组件40。
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。
参见图2所示，本实施例的电极组件20包括主体部201和与主体部201相连接的极耳202。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。本实施例的电极组件20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形成极耳 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。参见图4所示，本实施例的极耳202包括连接端202a、焊接端202c以及用于连接连接端202a和焊接端202c的中间段202b。极耳202所包括的连接端202a与主体部201相连接。
本申请实施例的顶盖组件40包括顶盖片401、电极端子402以及绝缘隔离件403。本实施例的顶盖片401与壳体10密封连接，以将电极组件20封闭于壳体10内。本实施例的顶盖片401具有防爆阀404。在二次电池内部压力过大时，防爆阀404能够爆破以释放内部压力，降低二次电池发生爆炸的可能性。本实施例的顶盖片401具有电极引出孔。本实施例的电极端子402设置于顶盖片401并与电极引出孔相对应设置。电极组件20所包括的极耳202与电极端子402电连接。在一个示例中，极耳202的焊接端202c可以与电极端子402直接焊接连接。在另一个示例中，二次电池还包括转接片。极耳202的焊接端202c与转接片焊接连接，从而极耳202的焊接端202c通过转接片与电极端子402连接。本实施例的顶盖片401为导电材料。绝缘隔离件403用于隔离顶盖片401与电极组件20，避免两者发生直接接触。
本实施例的二次电池还包括顶压板50。顶压板50设置于绝缘隔离件403和主体部201之间。顶压板50具有朝向主体部201的第一表面501、朝向绝缘隔离件403的第二表面502以及从第二表面502朝第一表面501凹陷的容纳槽505。极耳202的焊接端202c位于顶压板50和绝缘隔离件403之间且被容纳于容纳槽505。在主体部201发生窜动情况时，极耳202和主体部201的连接位置会频繁发生弯折或拉伸，易于导致极耳202断裂。本实施例中，在二次电池完成组装工作后，顶压板50能够向电极组件20的主体部201施加预定压力，以限制电极组件20的上下窜动，从而当二次电池整体出现振动情况时，可在一定程度上减小电极组件20的主体部201在壳体10内的上下窜动，进而电极组件20的极耳202不会频繁发生弯折而发生断裂，有效提升二次电池的使用安全性。
本申请实施例的二次电池，由于在绝缘隔离件403和电极组件20的 主体部201之间设置顶压板50，从而通过顶压板50对电极组件20进行固定，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发生断裂的可能性，提升二次电池的使用安全性。另外，顶压板50上设置具有容纳功能的容纳槽505。极耳202的焊接端202c的至少部分被容纳于容纳槽505内，这样，一方面，在顶盖片401的厚度方向Y上，焊接端202c和顶压板50两者的厚度较小，有效节省壳体10的内部空间，有效提升二次电池的能量密度；另一方面，由于极耳202的焊接端202c通过焊接的方式与电极端子402或者转接片连接固定，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50的容纳槽505能够收集焊渣以有效阻止焊渣掉落至主体部201上，有效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50能够将焊接端202c的焊接区域与主体部201物理隔离。在二次电池在组装过程中或使用过程中，焊接区域不会触碰到主体部201，降低主体部201被焊接区域刮擦或磨损而发生损坏的可能性，提升二次电池的使用安全性；最后，如果未设置容纳槽505，即顶压板50的第二表面502为平面，此时顶压板50两端被焊接端202c抵顶，而顶压板50中间部分处于悬空状态。当二次电池整体出现振动情况时，主体部201会对顶压板50产生向上的作用力，此时顶压板50两端发生翘曲，从而影响顶压板50的稳定性。
在一个实施例中，参见图2或图3所示，二次电池具有转接片30。本实施例的转接片30为平板状，从而在厚度方向Y上占用空间较少，使得结构更加紧凑。极耳202的焊接端202c与转接片30焊接连接。转接片30至少部分地被容纳于容纳槽505内。在顶盖片401的厚度方向Y上，转接片30、极耳202的焊接端202c和顶压板50结构更加紧凑，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。
本实施例的绝缘隔离件403具有远离主体部201凹陷的容纳凹部403d。顶压板50和焊接端202c均被容纳于容纳凹部403d。在顶盖片401的厚度方向Y上，绝缘隔离件403、极耳202的焊接端202c和顶压板50结构紧凑，进一步节省壳体10的内部空间，有效提高二次电池的能量密 度。在一个实施例中，顶压板50的第二表面502与容纳凹部403d的底部相抵靠。顶压板50与绝缘隔离件403之间没有可移动的间隙，从而顶压板50会受到绝缘隔离件403和主体部201的夹紧力，自身位置更加稳定，进而保证主体部201自身位置稳定，不易出现窜动情况。在一个实施例中，二次电池包括转接片30。焊接端202c通过转接片30与电极端子402连接。焊接端202c位于转接片30与顶压板50之间。顶压板50、焊接端202c以及转接片30均被容纳于容纳凹部403d。
在顶压板50和焊接端202c均被容纳于容纳凹部403d的实施例中，顶压板50的第一表面501凸出绝缘隔离件403朝向主体部201的下表面403e，从而使得绝缘隔离件403的下表面403e不与主体部201接触，降低绝缘隔离件403对主体部201局部施加过大压应力而导致主体部201发生损坏的可能性。
参见图3所示，本实施例的顶压板50具有第一卡接部508。绝缘隔离件403具有第二卡接部403f。顶压板50的第一卡接部508和绝缘隔离件403的第二卡接部403f相互卡接，以使顶压板50与绝缘隔离件403快速便捷地连接固定。两者连接过程中，第一卡接部508和第二卡接部403f可以彼此形成定位，有利于降低两者连接难度，实现快速组装，同时也有利于保证顶压板50安装过程中自身位置稳定。顶压板50不易沿顶盖片401的长度方向X晃动而刮擦焊接端202c。在一个实施例中，第一卡接部508为卡接孔，而第二卡接部403f为卡脚。容易理解地，第一卡接部508可以为卡脚，而第二卡接部403f可以为卡接孔。
参见图4所示，在厚度方向Y上，本实施例的极耳202的连接端202a的至少一部分位于顶压板50的下方，中间段202b绕过顶压板50，而焊接端202c位于容纳槽505内。在一个实施例中，参见图5所示，在顶压板50的宽度方向上，本实施例的顶压板50所包括的容纳槽505贯穿顶压板50。本实施例中，顶压板50的宽度方向与顶盖片401的宽度方向Z相同。本实施例的顶压板50在宽度方向Z上具有相对的两个侧表面507。容纳槽505从其中一个侧表面507贯穿至另一个侧表面507以形成贯通槽。在一个示例中，电极组件20的数量为两个。两个电极组件20在宽度方向 Z上并排设置。这样，一个电极组件20的极耳202从顶压板50的一侧绕过顶压板50，其所包括的焊接端202c处于容纳槽505内，而另一个电极组件20从顶压板50的另一侧绕过顶压板50，其所包括的焊接端202c处于容纳槽505内。在一个实施例中，侧表面507的形状为弧形，从而极耳202的中间段202b绕过顶压板50时，其与侧表面507之间接触面积大，贴合度更好，进而使得顶压板50对中间段202b所施加的力更加均衡，降低中间段202b被顶压板50的侧边挤压或刮擦而导致损坏的可能性。
参见图2或图3所示，在厚度方向Y上，本实施例的容纳槽505的深度大于或等于焊接端202c的厚度。焊接端202c整体被容纳于容纳槽505内。这样，一方面，进一步缩小焊接端202c和顶压板50两者的总厚度值，减小对壳体10内部空间的占用率，有利于进一步提高二次电池的能量密度；另一方面，二次电池组装后，绝缘隔离件403会直接与顶压板50接触，从而受到顶压板50的支承，使得绝缘隔离件403不会对焊接端202c施加挤压力。
参见图2或图3所示，本实施例的顶压板50具有第一端部503、第二端部504以及第一凸台506。第一端部503和第二端部504沿顶压板50的长度方向相对设置。顶压板50的长度方向与顶盖片401的长度方向X相同。第一凸台506设置于第一端部503和第二端部504之间且位于顶压板50的中间位置。容纳槽505的数量为两个。两个容纳槽505沿长度方向X分别设置于第一凸台506的两侧。在电极组件20的数量为一个时，电极组件20的一个极耳202设置于一个容纳槽505内，另一个极耳202设置于另一个容纳槽505内。第一凸台506将两个极耳202分隔开。在电极组件20的数量为两个时，每个电极组件20的两个极耳202的位置与两个容纳槽505的位置相对应，从而每个容纳槽505同时容纳两个电极组件20的两个极耳202。第一凸台506的两侧各自具有两个极耳202。在厚度方向Y上，顶压板50上设置第一凸台506的中间部分的厚度大于设置容纳槽505的部分的厚度。因此，顶压板50上设置第一凸台506的中间部分自身刚度大，受力不易发生弯折变形，降低因顶压板50的中间部分发生弯折而对主体部201施加过大压应力，从而导致主体部201发生损坏的可 能性。
在一个实施例中，参见图2或图3所示，绝缘隔离件403包括第一绝缘体403a和第二绝缘体403b。第一绝缘体403a和第二绝缘体403b沿长度方向X间隔设置。第一绝缘体403a和第二绝缘体403b之间形成让位间隙403c。顶压板50的第一凸台506与该让位间隙403c相对应设置。顶盖片401上具有与该让位间隙403c相对应设置的防爆阀404。第一凸台506上设置有与该让位间隙403c相对应的过流孔506a。在二次电池内部压力过大，防爆阀404被打开时，气流能够通过过流孔506a、让位间隙403c和打开的防爆阀404顺利快速地排出。在一个示例中，在二次电池完成组装后，第一凸台506的一部分可以伸入到让位间隙403c内，从而进一步节省壳体10内部空间，有利于提高二次电池的能量密度。
参见图3或图6所示，本实施例的第一绝缘体403a和第二绝缘体403b均具有第二凸台403g。第二凸台403g抵靠于容纳槽505的底部。第二凸台403g会对顶压板50起到支承作用，一方面，防止第一绝缘体403a和第二绝缘体403b与顶压板50之间存在间隙而导致第一绝缘体403a和第二绝缘体403b容易发生移位；另一方面，绝缘隔离件403能够阻止顶压板50的朝顶盖片401的方向发生翘曲，从而顶压板50的第一表面501能够与主体部201保持良好的接触贴合状态，对主体部201施加的压应力保持均衡状态。在厚度方向Y上，第二凸台403g的厚度大于或等于容纳槽505的深度，从而第二凸台403g能够抵压于容纳槽505的底部。在一个示例中，绝缘隔离件403与顶压板50相互通过第一卡接部508和第二卡接部403f卡接连接。第一卡接部508和第二卡接部403f形成的连接位和第二凸台403g形成两个支点，有效提高绝缘隔离件403的位置稳定性。
本申请实施例的二次电池，在顶盖片401与电极组件20的主体部201之间设置有顶压板50。顶压板50能够抵压主体部201，从而限制主体部201在壳体10内的位置，有效阻止主体部201在壳体10内发生窜动，进而避免出现由于主体部201的窜动而导致极耳202折弯断裂的情况，提升二次电池的使用安全性。顶压板50能够将极耳202的焊接端202c与主体 部201隔离开，以避免焊接端202c上的焊接区域刮擦或磨损主体部201。另外，本实施例的顶压板50具有容纳槽505。极耳202的中间段202b绕过顶压板50，以使焊接端202c位于容纳槽505内，从而在顶盖片401的厚度方向Y上，焊接端202c和顶压板50层叠厚度较小，节省壳体10内部空间，有利于提高二次电池的能量密度。
参见图7所示，本申请实施例提出一种二次电池的制造方法，其包括：
将顶盖组件40放置于预定装配工位，顶盖组件40包括顶盖片401以及连接于顶盖片401的绝缘隔离件403；
组装电极组件20与顶盖组件40，电极组件20包括主体部201以及与主体部201相连接的极耳202，极耳202具有连接端202a、焊接端202c以及连接连接端202a和焊接端202c的中间段202b，将连接端202a与主体部201相连接，将焊接端202c与顶盖组件40焊接连接，焊接端202c与顶盖片401通过绝缘隔离件403绝缘隔离；
组装顶压板50，顶压板50具有第一表面501、第二表面502以及从第二表面502朝第一表面501凹陷的容纳槽505，将顶压板50覆盖焊接端202c，然后调整电极组件20的位置，以使顶压板50位于绝缘隔离件403和主体部201之间，并且第一表面501朝向主体部201、第二表面502朝向绝缘隔离件403，将焊接端202c容纳于容纳槽505。
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 (14)

  1. 一种顶压板，用于二次电池，所述二次电池包括顶盖片、连接于所述顶盖片的绝缘隔离件以及电极组件，所述电极组件包括主体部以及与所述主体部相连接的极耳，所述极耳具有焊接端，其中，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凹陷的容纳槽；
    所述顶压板能够设置于所述绝缘隔离件和所述主体部之间，所述第一表面朝向所述主体部，所述第二表面朝向所述绝缘隔离件，所述容纳槽用于容纳所述焊接端。
  2. 根据权利要求1所述的顶压板，其中，沿所述顶压板的宽度方向，所述容纳槽贯穿所述顶压板。
  3. 根据权利要求1所述的顶压板，其中，所述顶压板具有第一凸台，所述容纳槽的数量为两个，两个所述容纳槽沿所述顶压板的长度方向分别设置于所述第一凸台的两侧。
  4. 一种二次电池，包括：
    电极组件，所述电极组件包括主体部以及与所述主体部相连接的极耳，所述极耳具有连接端、焊接端以及连接所述连接端和所述焊接端的中间段，所述连接端与所述主体部相连接；
    顶盖组件，所述顶盖组件包括顶盖片以及连接于所述顶盖片的绝缘隔离件；
    顶压板，所述顶压板设置于所述绝缘隔离件和所述主体部之间，所述顶压板具有朝向所述主体部的第一表面、朝向所述绝缘隔离件的第二表面以及从所述第二表面朝所述第一表面凹陷的容纳槽，所述焊接端被容纳于所述容纳槽。
  5. 根据权利要求4所述的二次电池，其中，沿所述顶盖片的宽度方向，所述容纳槽贯穿所述顶压板。
  6. 根据权利要求4所述的二次电池，其中，沿所述顶盖片的厚度方 向，所述容纳槽的深度大于或等于所述焊接端的厚度。
  7. 根据权利要求4至6任一项所述的二次电池，其中，所述顶压板具有第一凸台，所述容纳槽的数量为两个，两个所述容纳槽沿所述顶盖片的长度方向分别设置于所述第一凸台的两侧。
  8. 根据权利要求7所述的二次电池，其中，所述绝缘隔离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长度方向间隔设置以形成让位间隙，所述第一凸台与所述让位间隙相对应设置。
  9. 根据权利要求8所述的二次电池，其中，所述第一绝缘体和所述第二绝缘体均具有第二凸台，所述第二凸台抵靠于所述容纳槽的底部且所述第二凸台的厚度大于或等于所述容纳槽的深度。
  10. 根据权利要求8所述的二次电池，其中，所述顶盖组件还包括防爆阀，所述防爆阀设置于所述顶盖片且与所述第一凸台相对应设置，所述第一凸台具有与所述防爆阀相对应的过流孔。
  11. 根据权利要求4至6任一项所述的二次电池，其中，所述绝缘隔离件具有远离所述主体部凹陷的容纳凹部，所述顶压板以及所述焊接端均被容纳于所述容纳凹部。
  12. 根据权利要求4至6任一项所述的二次电池，其中，所述二次电池还包括转接片，所述转接片为平板状，所述焊接端与所述转接片焊接连接，所述转接片至少部分地被容纳于所述容纳槽。
  13. 根据权利要求4至6任一项所述的二次电池，其中，所述顶压板具有第一卡接部，所述绝缘隔离件具有第二卡接部，所述第一卡接部与所述第二卡接部卡接连接，其中，所述第一卡接部和所述第二卡接部中的一者为卡接孔，另一者为卡脚。
  14. 一种二次电池的制造方法，其中，包括：
    将顶盖组件放置于预定装配工位，所述顶盖组件包括顶盖片以及连接于所述顶盖片的绝缘隔离件；
    组装电极组件与所述顶盖组件，所述电极组件包括主体部以及与所述主体部相连接的极耳，所述极耳具有连接端、焊接端以及连接所述连接端和所述焊接端的中间段，将所述连接端与所述主体部相连接，将所述焊接 端与所述顶盖组件焊接连接，所述焊接端与所述顶盖片通过所述绝缘隔离件绝缘隔离；
    组装顶压板，所述顶压板具有第一表面、第二表面以及从所述第二表面朝所述第一表面凹陷的容纳槽，将所述顶压板覆盖所述焊接端，然后调整所述电极组件的位置，以使所述顶压板位于所述绝缘隔离件和所述主体部之间，并且所述第一表面朝向所述主体部、所述第二表面朝向所述绝缘隔离件，将所述焊接端容纳于所述容纳槽。
PCT/CN2019/111200 2018-10-30 2019-10-15 顶压板、二次电池以及二次电池的制造方法 WO2020088239A1 (zh)

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