WO2020215939A1 - 电池模组、二次电池及其顶盖组件 - Google Patents

电池模组、二次电池及其顶盖组件 Download PDF

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Publication number
WO2020215939A1
WO2020215939A1 PCT/CN2020/080212 CN2020080212W WO2020215939A1 WO 2020215939 A1 WO2020215939 A1 WO 2020215939A1 CN 2020080212 W CN2020080212 W CN 2020080212W WO 2020215939 A1 WO2020215939 A1 WO 2020215939A1
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WIPO (PCT)
Prior art keywords
top cover
cover assembly
terminal
electrode terminal
positioning hole
Prior art date
Application number
PCT/CN2020/080212
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English (en)
French (fr)
Inventor
郑于炼
邢承友
王鹏
李国伟
Original Assignee
宁德时代新能源科技股份有限公司
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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 JP2021551825A priority Critical patent/JP7239728B2/ja
Publication of WO2020215939A1 publication Critical patent/WO2020215939A1/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
    • H01M50/10—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
    • H01M50/102—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
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch 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
    • H01M50/543—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
    • H01M50/543—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
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • 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

  • This application relates to the field of batteries, and in particular to a battery module, a secondary battery and its top cover assembly.
  • Secondary batteries have the advantages of high energy density, long service life, energy saving and environmental protection, and are widely used in different fields such as new energy vehicles and energy storage power stations.
  • a bus bar is usually required to connect the multiple secondary batteries in series or in parallel.
  • the bus bar is generally welded to the electrode terminal of the secondary battery; however, in the prior art, the positioning accuracy of the electrode terminal and the bus bar during welding is poor, resulting in deviations in the welding position of the bus bar, insufficient welding strength, and failure of the battery module .
  • the purpose of the present application is to provide a battery module, a secondary battery and a top cover assembly thereof, which can improve the positioning accuracy of the electrode terminals and the bus bar and increase the welding strength.
  • the present application provides a top cover assembly, including: a top cover plate provided with terminal holes; and electrode terminals covering the terminal holes.
  • the electrode terminal has an outer surface.
  • the electrode terminal includes a positioning hole, which is recessed relative to the outer surface of the electrode terminal and includes a first part and a second part.
  • the second part is located on the side of the first part away from the outer surface, and the first part is parallel to the central axis of the positioning hole
  • the section is trapezoidal. As the first part approaches the second part, the aperture size of the first part gradually decreases, and the minimum aperture size of the first part is greater than or equal to the aperture size of the second part.
  • the first part has a first peripheral surface, and the included angle between the first peripheral surface and the outer surface is 135 degrees to 175 degrees.
  • the first part has a first peripheral surface.
  • the outer surface includes a first area and a second area, the first area surrounds the outside of the first circumferential surface and is connected to the first circumferential surface, and the second area surrounds the outside of the first area and is connected to the first area.
  • the roughness of the first area is greater than the roughness of the first peripheral surface.
  • the roughness of the first region is 1 ⁇ m-14 ⁇ m.
  • the size of the second part gradually decreases along the direction of the second part away from the first part.
  • the second part has a second peripheral surface, and the second peripheral surface is a circular arc surface.
  • the shape of the second part is different from the shape of the first part.
  • the positioning hole further includes a third part, and the third part is cylindrical and located between the first part and the second part.
  • the electrode terminal includes a first terminal plate and a second terminal plate, and the first terminal plate is located on a side of the second terminal plate away from the top cover plate.
  • the first terminal board is made of aluminum, and the second terminal board is made of copper.
  • the positioning hole is formed in the first terminal plate, and the depth of the positioning hole is smaller than the thickness of the first terminal plate.
  • the top cover assembly further includes a fixing member connected to the top cover plate and the electrode terminal, and the edge of the electrode terminal is located between the fixing member and the top cover plate.
  • the electrode terminal is arranged on one side of the top cover plate.
  • the top cover assembly further includes a connecting piece, and the connecting piece is provided with a convex hull which extends into the terminal hole and is connected to the electrode terminal.
  • the top cover assembly further includes a sealing ring disposed between the top cover plate and the electrode terminal.
  • the present application also provides a secondary battery, including: an electrode assembly, a casing, and the above-mentioned top cover assembly.
  • the electrode assembly is contained in the casing, the top cover plate of the top cover assembly is connected with the casing, and the electrode terminal of the top cover assembly is arranged on the side of the top cover plate away from the electrode assembly.
  • the present application also provides a battery module, including the above-mentioned secondary battery and a bus bar.
  • the bus bar is connected to the electrode terminal of the top cover assembly of the secondary battery, and the bus bar has a through hole that is vertically opposed to the positioning hole of the electrode terminal.
  • the through hole exposes the first peripheral surface of the first part of the positioning hole, and the ratio of the exposed area of the first peripheral surface to the total area of the first peripheral surface is greater than 2/3.
  • the bus bar is welded to the second area of the outer surface of the electrode terminal, and the through hole exposes at least part of the first area of the outer surface.
  • Fig. 1 is a schematic diagram of a secondary battery according to the present application.
  • Fig. 2 is a cross-sectional view of the secondary battery according to the present application.
  • Fig. 3 is an enlarged view of the block part of Fig. 2.
  • Fig. 4 is a schematic diagram of the electrode terminal of Fig. 3.
  • Fig. 5 is an enlarged view of the block part of Fig. 4.
  • Fig. 6 is a plan view of the electrode terminal of Fig. 4.
  • Fig. 7 is a schematic diagram of a battery module according to the present application.
  • Fig. 8 is a schematic diagram of the connection between the secondary battery and the bus bar.
  • the battery module of the present invention may include a plurality of secondary batteries.
  • the secondary battery may be a cylindrical lithium ion battery.
  • the plurality of secondary batteries may be sequentially arranged along the width direction Y.
  • the battery module may further include end plates and side plates. There are two end plates and are respectively disposed at both ends of the plurality of secondary batteries along the width direction Y, and there are two side plates and are respectively disposed on the plurality of two Both sides of the secondary battery along the length direction X.
  • the end plate and the side plate are connected as one body and form a rectangular frame, and the frame fixes the plurality of secondary batteries.
  • the secondary battery of the present invention may include a top cover assembly 1, an electrode assembly 2 and a case 3.
  • the electrode assembly 2 is a core component of the secondary battery to realize the charge and discharge function.
  • the electrode assembly 2 includes a positive pole piece, a negative pole piece and a separator, and the separator separates the positive pole piece and the negative pole piece.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector.
  • the positive electrode current collector may be aluminum foil, and the positive electrode active material layer includes a ternary material, lithium manganate or lithium iron phosphate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector.
  • the negative electrode current collector may be copper foil, and the negative electrode active material layer includes graphite or silicon.
  • the electrode assembly 2 may have a wound structure. Specifically, both the positive pole piece and the negative pole piece are one, and the positive pole piece and the negative pole piece have a strip structure. The positive pole piece, the separator, and the negative pole piece are sequentially stacked and wound two or more turns to form the electrode assembly 2.
  • the electrode assembly 2 can be wound into a hollow cylindrical structure first, and then flattened into a flat shape after the winding.
  • the electrode assembly 2 may also have a laminated structure. Specifically, there are multiple positive pole pieces and multiple negative pole pieces, the multiple positive pole pieces and negative pole pieces are alternately stacked, and the positive pole piece and the negative pole piece are separated by a separator.
  • the housing 3 may have a hexahedral shape or other shapes.
  • a receiving cavity is formed inside the casing 3 to contain the electrode assembly 2 and the electrolyte.
  • the housing 3 has an opening at one end, and the electrode assembly 2 can be placed into the receiving cavity of the housing 3 through the opening.
  • the housing 3 may be made of conductive metal material. In some examples, the housing 3 is made of aluminum or aluminum alloy.
  • the top cover assembly 1 includes a top cover plate 11 and an electrode terminal 12.
  • the top cover plate 11 is disposed on the housing 3 and covers the opening of the housing 3 so as to seal the electrode assembly 2 in the housing 3.
  • the top cover plate 11 may be a metal plate, and is connected to the housing 3 by welding.
  • the top cover 11 is provided with two through terminal holes 111.
  • Two electrode terminals 12 are provided on the upper side of the top cover 11 in the height direction Z, that is, the side of the top cover 11 away from the electrode assembly 2.
  • Each electrode terminal 12 covers a corresponding terminal hole 111.
  • a sealing ring is arranged between the top cover plate 11 and the electrode terminal 12, and the terminal hole 111 can be sealed by compressing the sealing ring.
  • the top cover assembly 1 further includes a fixing member 13 and a connecting piece 14, and the fixing member 13 fixes the electrode terminal 12 to the top cover plate 11.
  • the connecting piece 14 may be provided with a convex hull 141 which extends into the terminal hole 111 and is connected to the electrode terminal 12.
  • a plurality of secondary batteries may be connected together via the bus bar 4. 7, one end of the bus bar 4 is connected to the electrode terminal 12 of one secondary battery, and the other end of the bus bar 4 is connected to the electrode terminal 12 of another secondary battery, thereby connecting the two secondary batteries in series or in parallel.
  • the bus bar 4 can be fixed to the electrode terminal 12 by laser welding. During welding, the laser acts on the surface of the bus bar 4. If the position of the bus bar 4 is deviated, it will cause the laser to be misaligned and cause poor welding; more seriously, the misaligned laser may directly act on the top cover 11, causing the top The cover plate 11 is melted through, causing safety hazards.
  • the electrode terminal 12 has an outer surface 121 at an end away from the top cover plate 11.
  • the electrode terminal 12 has a positioning hole 122 that is recessed with respect to the outer surface 121 of the electrode terminal 12.
  • the bus bar 4 has a through hole 41 that is vertically opposed to the positioning hole 122 of the electrode terminal 12. The size of the through hole 41 is larger than the size of the positioning hole 122.
  • the laser welding equipment is equipped with a CCD camera capture function to find the desired welding location.
  • the charge coupled device image sensor CCD Charge Coupled Device
  • the charge coupled device image sensor CCD is made of a high-sensitivity semiconductor material, which can convert light into electric charge, which is converted into a digital signal by an analog-to-digital converter chip.
  • the digital signal is compressed by the camera's internal
  • the flash memory or built-in hard disk card saves it, so you can easily transfer the data to the computer, and with the help of the computer's processing means, you can modify the image according to your needs and imagination.
  • CCD is composed of many photosensitive units, usually in megapixels.
  • the positioning hole 122 is recessed inward with respect to the outer surface 121, so the outline of the positioning hole 122 can be displayed in the CCD.
  • the geometric center of the positioning hole 122 can be found, and then the welding trajectory can be calculated based on the geometric center. Finally, the laser welding equipment can be welded along the calculated welding track.
  • the positioning hole 122 helps to improve the positioning accuracy of the electrode terminal 12 and the bus bar 4 and increase the welding strength.
  • the positioning hole 122 is configured as a cylindrical hole, then in the photo taken by the CCD, the junction between the positioning hole 122 and the outer surface 121 is a thin line; at the same time, due to errors, the bus bar 4 may also block the positioning hole 122 Part of the area. Therefore, the outline of the positioning hole 122 is not clearly displayed in the CCD, and the proportion of CCD positioning failure is relatively high, and there is still a risk of welding failure.
  • the positioning hole 122 includes a first portion 122 a and a second portion 122 b, and the second portion 122 b is located on a side of the first portion 122 a away from the outer surface 121.
  • the cross section of the first part 122a parallel to the central axis of the positioning hole 122 is trapezoidal.
  • the second portion 122b has a different shape from the first portion 122a.
  • the aperture size of the first portion 122a gradually decreases, and the minimum aperture size of the first portion 122a is greater than or equal to the aperture size of the second portion 122b.
  • the first portion 122a is generally a truncated cone with a large hole outside and a small hole inside.
  • the first portion 122a has a first circumferential surface 122c
  • the second portion 122b has a second circumferential surface 122d
  • the first circumferential surface 122c is connected to the second circumferential surface 122d.
  • the positioning hole 122 is a blind hole
  • the lower end of the second portion 122b along the height direction Z also has a bottom surface 122g.
  • the first peripheral surface 122c of the first portion 122a is shown as a ring-shaped area in the photo taken by the CCD and has a larger width, which can increase the range of the CCD capture.
  • the first circumferential surface 122c is inclined at a certain angle with respect to the outer surface 121, so in the photos taken by the CCD, the first circumferential surface 122c and the outer surface 121 have different depths in color, which is convenient for the CCD to find the geometry of the positioning hole 122 Center (that is, the center axis of the positioning hole 122).
  • the positioning hole 122 also has a second portion 122b with a smaller size.
  • the depth of the positioning hole 122 can be increased, and the contrast between the first portion 122a and the second portion 122b can be increased, and the ability of the CCD to capture the first peripheral surface 122c is further improved.
  • the CCD can accurately calculate the geometric center of the positioning hole 122 according to the captured contour of the first peripheral surface 122c.
  • the CCD device can accurately calculate the geometric center of the positioning hole 122, improve the positioning accuracy of the electrode terminal 12 and the bus bar 4, and avoid laser action on the top cover. On the board 11, the welding strength is improved.
  • the photo taken by the CCD on the first peripheral surface 122c has a larger width and a darker color, even if the bus bar 4 blocks a part of the positioning hole 122 due to errors, it will not affect the positioning of the CCD. In other words, the through hole 41 does not need to completely expose the first peripheral surface 122c.
  • the ratio of the exposed area of the first peripheral surface 122c to the total area of the first peripheral surface 122c should be greater than 2/3. If the range of the first circumferential surface 122c blocked by the bus bar 4 exceeds 1/3, even if the first circumferential surface 122c has a larger width and darker color in the photo taken by the CCD, it may cause positioning failure.
  • the angle between the first peripheral surface 122c and the outer surface 121 is ⁇ .
  • the depth of the first portion 122a along the height direction Z is constant, the larger the value of ⁇ , the smaller the degree of inclination of the first peripheral surface 122c.
  • the first peripheral surface 122c and the outer surface 121 are in color The smaller the difference is; however, in the photos taken by the CCD, the width of the first circumferential surface 122c is larger. The smaller the value of ⁇ , the greater the degree of inclination of the first circumferential surface 122c.
  • the difference in color between the first circumferential surface 122c and the outer surface 121 is greater; of course, the In the photo, the width of the first circumferential surface 122c is smaller. Therefore, in some examples, the value of ⁇ is between 135 degrees and 175 degrees. In this case, the width and color depth of the first peripheral surface 122c in the photo taken by the CCD can be considered to improve the positioning function.
  • the positioning hole 122 further includes a third portion 122e.
  • the third portion 122e is cylindrical and located between the first portion 122a and the second portion 122b.
  • the third portion 122e has a cylindrical third peripheral surface 122f, and the third peripheral surface 122f connects the first peripheral surface 122c and the second peripheral surface 122d.
  • the third part 122e is an equal diameter hole.
  • the outer surface 121 includes a first area 121a and a second area 121b.
  • the first area 121a surrounds the first peripheral surface 122c and is connected to the first peripheral surface 122c
  • the second area 121b surrounds the first area 121a and is connected to the first peripheral surface 122c.
  • the areas 121a are connected.
  • the roughness of the first region 121a is greater than the roughness of the first peripheral surface 122c.
  • the contrast of the first area 121a and the first peripheral surface 122c in the photo can be improved, which facilitates the CCD to capture the first peripheral surface 122c and improves the positioning performance.
  • the through hole 41 should expose at least part of the first area 121a.
  • the roughness of the first region 121a is 1 ⁇ m-14 ⁇ m. If the roughness of the first region 121a is less than 1 ⁇ m, the influence on the contrast of the first region 121a and the first peripheral surface 122c in the photo is small. If the roughness of the first region 121a is greater than 14 ⁇ m, the flatness of the first region 121a will be too poor; when the bus bar 4 is attached to the first region 121a and the second region 121b, the smoothness of the bus bar 4 will be poor. In some examples, the roughness of the first region 121a is 1.2 ⁇ m-7 ⁇ m.
  • the bus bar 4 can be welded to the second area 121b of the outer surface 121. If the roughness of the second area 121b is too large, when the bus bar 4 is welded to the second area 121b, it is likely to cause poor welding. Therefore, the roughness of the second region 121b is smaller than the roughness of the first region 121a.
  • the second peripheral surface 122d of the second portion 122b is a circular arc surface.
  • the electrode terminal 12 is provided on one side of the top cover plate 11, and the electrode terminal 12 does not need to pass through the terminal hole of the top cover plate 11. Therefore, the electrode terminal 12 can have a smaller thickness.
  • gas is generated inside the casing 3, and the gas exerts pressure on the top cover 11 and the electrode terminals 12.
  • the electrode terminal 12 is deformed under the action of gas pressure.
  • the pressure will concentrate on the positioning hole 122 of the electrode terminal 12, and if the gas pressure is too high, the electrode terminal 12 will be broken.
  • round corners are provided at the bottom of the positioning hole 122 to form a circular arc-shaped second peripheral surface 122d.
  • the arc-shaped second circumferential surface 122d can disperse stress and reduce the risk of cracking of the electrode terminal 12.
  • the top cover assembly 1 further includes a fixing member 13 connected to the top cover plate 11 and the electrode terminal 12, and the edge of the electrode terminal 12 is located between the fixing member 13 and the top cover plate 11.
  • the fixing member 13 may include a fixing piece 131 and an insulating piece 132.
  • the fixing piece 131 may be fixed to the top cover plate 11 by welding.
  • the insulating piece 132 is integrated on the fixing piece 131 and separates the fixing piece 131 and the electrode terminal 12.
  • the insulating member 132 may surround the outer side of the electrode terminal 12, and the edge of the electrode terminal 12 is located between the insulating member 132 and the top cover plate 11.
  • the insulator 132 can tightly press the electrode terminal 12 on the top cover plate 11 to prevent the electrode terminal 12 from being separated from the top cover plate 11.
  • the edge of the electrode terminal 12 is restricted by the insulating member 132, the middle area of the electrode terminal 12 provided with the positioning hole 122 is likely to bulge and deform under the action of gas pressure. If the arc-shaped second peripheral surface 122d is not provided, the electrode terminal 12 is easily broken under the action of gas pressure.
  • the electrode terminal 12 electrically connected to the negative pole piece it may be a metal composite plate.
  • the electrode terminal 12 may include a first terminal board 123 made of aluminum and a second terminal board 124 made of copper.
  • the first terminal board 123 and the second terminal board 124 may be cold-rolled, hot-rolled, or explosively compounded. Or explosive rolling method and other methods are combined into one.
  • the first terminal plate 123 is located on a side of the second terminal plate 124 away from the top cover plate 11.
  • the second terminal plate 124 made of copper is used to facilitate the connection between the second terminal plate 124 and the negative electrode sheet.
  • the material of the bus bar 4 is usually aluminum, and the first terminal board 123 made of aluminum is used to facilitate the welding of the first terminal board 123 and the bus bar 4.
  • the positioning hole 122 is formed in the first terminal plate 123. That is, the depth of the positioning hole 122 is smaller than the thickness of the first terminal plate 123. This can prevent the composite interface of the first terminal board 123 and the second terminal board 124 from being exposed, and prevent the first terminal board 123 and the second terminal board 124 from being separated.

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

一种电池模组、二次电池及其顶盖组件（1）。顶盖组件（1）包括顶盖板（11），设置有端子孔（111）；以及电极端子（12），覆盖端子孔（111），电极端子（12）远离顶盖板（11）的一端具有外表面（121），电极端子（12）具有由外表面（121）向内凹陷的定位孔（122），定位孔（122）包括第一部分（122a）和第二部分（122b），第二部分（122b）位于第一部分（122a）远离外表面（121）的一侧，第一部分（122a）的平行于定位孔（122）的中心轴的截面为梯形；沿第一部分（122a）靠近第二部分（122b）的方向，第一部分（122a）的孔径尺寸逐渐减小，且第一部分（122a）的最小孔径尺寸大于或等于第二部分（122b）的孔径尺寸。

Description

电池模组、二次电池及其顶盖组件
相关申请的交叉引用
本申请要求享有于2019年04月26日提交的名称为“电池模组、二次电池及其顶盖组件”的中国专利申请201920589861.6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
本申请涉及电池领域，尤其涉及一种电池模组、二次电池及其顶盖组件。
背景技术
二次电池具有能量密度大，使用寿命长、节能环保等优点，被广泛应用于新能源汽车、储能电站等不同领域。当多个二次电池连接成组时，通常需要汇流条将所述多个二次电池串联或并联。汇流条一般焊接于二次电池的电极端子；然而，在现有技术中，焊接时电极端子和汇流条定位精度较差，导致汇流条的焊接位置出现偏差，焊接强度不足，造成电池模组失效。
发明内容
鉴于背景技术中存在的问题，本申请的目的在于提供一种电池模组、二次电池及其顶盖组件，其能改善电极端子和汇流条的定位精度，提高焊接强度。
一方面，本申请提供了一种顶盖组件，包括：顶盖板，设置有端子孔；以及电极端子，覆盖端子孔。电极端子具有外表面。电极端子包括定位孔，定位孔相对于所述电极端子的外表面凹陷且包括第一部分和第二部分，第二部分位于第一部分远离外表面的一侧，第一部分的平行于定位孔的中心 轴的截面为梯形。沿第一部分靠近第二部分的方向，第一部分的孔径尺寸逐渐减小，且第一部分的最小孔径尺寸大于或等于第二部分的孔径尺寸。
在一实施例中，第一部分具有第一周面，第一周面与外表面的夹角为135度-175度。
在一实施例中，第一部分具有第一周面。外表面包括第一区域和第二区域，第一区域环绕在第一周面外侧且与第一周面相连，第二区域环绕在第一区域外侧且与第一区域相连。第一区域的粗糙度大于第一周面的粗糙度。
在一实施例中，第一区域的粗糙度为1μm-14μm。
在一实施例中，沿第二部分远离第一部分的方向，第二部分的尺寸逐渐减小。第二部分具有第二周面，第二周面为圆弧面。
在一实施例中，第二部分的形状与第一部分的形状不同。
在一实施例中，定位孔还包括第三部分，第三部分为柱形且位于第一部分和第二部分之间。
在一实施例中，电极端子包括第一端子板和第二端子板，第一端子板位于第二端子板的远离顶盖板的一侧。第一端子板由铝制成，第二端子板由铜制成。定位孔形成于第一端子板，且定位孔的深度小于第一端子板的厚度。
在一实施例中，顶盖组件还包括固定构件，固定构件连接顶盖板和电极端子，电极端子的边缘位于固定构件和顶盖板之间。
在一实施例中，电极端子设置于顶盖板的一侧。
在一实施例中，顶盖组件还包括连接片，连接片设置有凸包，凸包伸入端子孔中且与电极端子连接。
在一实施例中，顶盖组件还包括密封圈，密封圈设置于顶盖板和电极端子之间。
另一方面，本申请还提供了一种二次电池，包括：电极组件、壳体以及上述的顶盖组件。电极组件收容于壳体内，顶盖组件的顶盖板与壳体连接，顶盖组件的电极端子设置于顶盖板的远离电极组件的一侧。
另一方面，本申请还提供了一种电池模组，包括：上述的二次电池和 汇流条。汇流条与二次电池的顶盖组件的电极端子连接，且汇流条具有与电极端子的定位孔上下相对的通孔。通孔将定位孔的第一部分的第一周面露出，且第一周面露出的面积与第一周面的总面积之比大于2/3。
在一实施例中，汇流条焊接于电极端子的外表面的第二区域，通孔将外表面的第一区域的至少部分露出。
附图说明
从下面结合附图对本申请的具体实施方式的描述中可以更好地理解本申请，其中，通过阅读以下参照附图对非限制性实施例所作的详细描述，本申请的其它特征、目的和优点将会变得更明显，相同或相似的附图标记表示相同或相似的特征。
图1为根据本申请的二次电池的一示意图。
图2为根据本申请的二次电池的一剖视图。
图3为图2的方框部分的放大图。
图4为图3的电极端子的示意图。
图5为图4的方框部分的放大图。
图6为图4的电极端子的俯视图。
图7为根据本申请的电池模组的示意图。
图8为二次电池与汇流条的连接示意图。
附图标记说明：
1顶盖组件
11顶盖板
111端子孔
12电极端子
121外表面
121a第一区域
121b第二区域
122定位孔
122a第一部分
122b第二部分
122c第一周面
122d第二周面
122e第三部分
122f第三周面
122g底面
123第一端子板
124第二端子板
13固定构件
131固定片
132绝缘件
14连接片
141凸包
2电极组件
3壳体
4汇流条
41通孔
X长度方向
Y宽度方向
Z高度方向。
具体实施方式
下面将详细描述本申请的各个方面的特征和示例性实施例。下面的详细描述中公开了许多具体细节，以便全面理解本申请。但是，对于本领域技术人员来说，很明显的是，本申请可以在不需要这些具体细节中的一些细节的情况下实施。下面对实施例的描述仅仅是为了通过示出本申请的示例来提供对本申请的更好的理解。本申请决不限于下面所提出的任何具体配置，而是在不脱离本申请的精神的前提下覆盖了元素和部件的任何修改、替换和改进。在附图和下面的描述中，没有示出公知的结构和技术，以便 避免对本申请造成不必要的模糊。
参照图7，本发明的电池模组可包括多个二次电池。二次电池可为柱形的锂离子电池。多个二次电池可沿宽度方向Y依次排列。
电池模组还可包括端板和侧板，端板为两个且分别设置于所述多个二次电池沿宽度方向Y的两端，侧板为两个且分别设置于所述多个二次电池沿长度方向X的两侧。端板和侧板连接为一体并形成矩形的框架，所述框架固定所述多个二次电池。
参照图1和图2，本发明的二次电池可包括顶盖组件1、电极组件2和壳体3。
电极组件2是二次电池实现充放电功能的核心构件。电极组件2包括正极极片、负极极片和隔膜，隔膜将正极极片和负极极片隔开。正极极片包括正极集流体和涂覆于正极集流体表面的正极活性物质层，正极集流体可为铝箔，正极活性物质层包括三元材料、锰酸锂或磷酸铁锂。负极极片包括负极集流体和涂覆于负极集流体表面的负极活性物质层，负极集流体可为铜箔，负极活性物质层包括石墨或硅。
电极组件2可为卷绕式结构。具体地，正极极片和负极极片均为一个，且正极极片和负极极片为带状结构。将正极极片、隔膜和负极极片依次层叠并卷绕两圈以上以形成电极组件2。在制备电极组件2时，电极组件2可先卷绕成中空的柱形结构，卷绕后再压平为扁平状。
可替代地，电极组件2也可为叠片式结构。具体地，正极极片设置为多个，负极极片设置为多个，所述多个正极极片和负极极片交替层叠，隔膜将正极极片和负极极片隔开。
壳体3可具有六面体形状或其它形状。壳体3内部形成收容腔，以容纳电极组件2和电解液。壳体3在一端形成开口，而电极组件2可经由所述开口放置到壳体3的收容腔。壳体3可由导电金属的材料制成，在一些示例中，壳体3由铝或铝合金制成。
顶盖组件1包括顶盖板11和电极端子12，顶盖板11设置于壳体3并覆盖壳体3的开口，从而将电极组件2密封在壳体3内。顶盖板11可为金属板，且通过焊接的方式连接于壳体3。
顶盖板11设有两个贯通的端子孔111。电极端子12为两个且设置于顶盖板11沿高度方向Z的上侧，即顶盖板11远离电极组件2的一侧。各电极端子12覆盖对应的一个端子孔111。顶盖板11和电极端子12之间设置有密封圈，通过压缩密封圈可实现端子孔111的密封。
顶盖组件1还包括固定构件13和连接片14，固定构件13将电极端子12固定到顶盖板11上。连接片14为两个，一个连接片14连接一个电极端子12和电极组件2的正极极片，另一个连接片14连接另一个电极端子12和电极组件2的负极极片。连接片14可设置有凸包141，凸包141伸入端子孔111中且与电极端子12连接。
在电池模组中，多个二次电池可经由汇流条4连接在一起。参照图7，汇流条4的一端连接于一个二次电池的电极端子12，汇流条4的另一端连接于另一个二次电池的电极端子12，从而将两个二次电池串联或并联。
汇流条4可通过激光焊接的方式固定于电极端子12。在焊接时，激光作用在汇流条4的表面，如果汇流条4的位置出现偏差，会导致激光错位，造成焊接不良；更严重地，错位的激光可能直接作用在顶盖板11上，导致顶盖板11被熔穿，引发安全隐患。
电极端子12在远离顶盖板11的一端具有外表面121。在一些示例中，电极端子12具有定位孔122，定位孔122相对于电极端子12的外表面121凹陷。对应地，汇流条4具有与电极端子12的定位孔122上下相对的通孔41。通孔41的尺寸大于定位孔122的尺寸。
焊接时，首先将汇流条4放置到电极端子12的上方，并使通孔41与电极端子12的定位孔122沿高度方向Z上下相对，通孔4将定位孔122露出。然后利用CCD图像传感器对定位孔122进行定位。
具体地，激光焊接设备上带有CCD拍照捕捉功能，用于寻找所需焊接的位置。电荷藕合器件图像传感器CCD(Charge Coupled Device)使用一种高感光度的半导体材料制成，能把光线转变成电荷，通过模数转换器芯片转换成数字信号，数字信号经过压缩以后由相机内部的闪速存储器或内置硬盘卡保存，因而可以轻而易举地把数据传输给计算机，并借助于计算机的处理手段，根据需要和想像来修改图像。CCD由许多感光单位组成， 通常以百万像素为单位。当CCD表面受到光线照射时，多个感光单位会将电荷反映在组件上，所有的感光单位所产生的信号加在一起，就构成了一幅完整的画面。定位孔122相对于外表面121向内凹陷，因此，定位孔122的轮廓可以在CCD中显示出来。经过计算机算法，能够找到定位孔122的几何中心，再以该几何中心计算出焊接轨迹。最后，激光焊接设备沿着计算出的焊接轨迹焊接即可。
因此，在本发明中，定位孔122有助于改善电极端子12和汇流条4的定位精度，提高焊接强度。
然而，如果定位孔122设置为柱形孔，那么在CCD拍摄出的照片中，定位孔122与外表面121的交界处为细线；同时，由于误差，汇流条4也可能会遮挡定位孔122的部分区域。因此，定位孔122的轮廓在CCD中的显示并不明显，CCD定位失效的比例较高，仍然存在焊接失效的风险。
因此，在一些示例中，参照图4和图5，定位孔122包括第一部分122a和第二部分122b，第二部分122b位于第一部分122a远离外表面121的一侧。第一部分122a的平行于定位孔122的中心轴的截面为梯形。第二部分122b具有不同于第一部分122a的形状。沿远离外表面121的方向，第一部分122a的孔径尺寸逐渐减小，且第一部分122a的最小孔径尺寸大于或等于第二部分122b的孔径尺寸。
在本发明中，第一部分122a大体为圆台状且外大内小的孔。第一部分122a具有第一周面122c，第二部分122b具有第二周面122d，第一周面122c连接于第二周面122d。定位孔122为盲孔，第二部分122b沿高度方向Z的下端还具有底面122g。
与直孔相比，第一部分122a的第一周面122c在CCD拍摄出的照片中显示为环形的区域，具有较大的宽度，这样可以增大CCD捕捉的范围。另外，第一周面122c相对于外表面121倾斜一定的角度，所以在CCD拍摄出的照片，第一周面122c与外表面121在颜色上具有不同的深度，便于CCD找到定位孔122的几何中心(即定位孔122的中心轴)。
另外，定位孔122还具有尺寸较小的第二部分122b。通过设置第二部分122b可以增大定位孔122的深度，并增大第一部分122a和第二部分122b 之间的对比度，进一步提高CCD捕捉第一周面122c的能力。CCD可以根据捕捉到的第一周面122c的轮廓，精确地计算出定位孔122的几何中心。
综上所述，本发明通过设置具有特定形状的定位孔122，可以使CCD设备精确地计算出定位孔122的几何中心，改善电极端子12和汇流条4的定位精度，避免激光作用在顶盖板11上，提高焊接强度。
因为第一周面122c在CCD拍摄出的照片具有较大的宽度和较深的颜色，因此，即使汇流条4因误差遮挡定位孔122的部分区域，也不会影响CCD的定位。也就是说，通孔41无需将第一周面122c完全露出。当然，为了保证CCD的定位精度，第一周面122c露出的面积与第一周面122c的总面积之比应大于2/3。如果第一周面122c的被汇流条4遮挡的范围超过1/3，即使第一周面122c在CCD拍摄出的照片具有较大的宽度和较深的颜色，也可能会导致定位失效。
参照图5，第一周面122c与外表面121的夹角为α。当第一部分122a沿高度方向Z的深度一定时，α的值越大，第一周面122c倾斜的程度越小，在CCD拍摄出的照片中，第一周面122c与外表面121在颜色上的差异性越小；但是，在CCD拍摄出的照片中，第一周面122c的宽度却越大。α的值越小，第一周面122c倾斜的程度越大，在CCD拍摄出的照片中，第一周面122c与外表面121在颜色上的差异性越大；当然，在CCD拍摄出的照片中，第一周面122c的宽度却越小。因此，在一些示例中，α的值为135度-175度，此时，可以兼顾第一周面122c在CCD拍摄出的照片中的宽度和颜色深度，改善定位功能。
定位孔122还包括第三部分122e，第三部分122e为柱形且位于第一部分122a和第二部分122b之间。第三部分122e具有柱形的第三周面122f，第三周面122f连接第一周面122c和第二周面122d。第三部分122e为等径孔。通过设置第三部分122e，可以增大第一部分122a和第二部分122b的距离，减少反光，提高第一周面122c和第二周面122d在照片中的对比度，改善定位功能。
外表面121包括第一区域121a和第二区域121b，第一区域121a环绕在第一周面122c外侧且与第一周面122c相连，第二区域121b环绕在第一 区域121a外侧且与第一区域121a相连。第一区域121a的粗糙度大于第一周面122c的粗糙度。
在本发明中，通过增大第一区域121a的粗糙度，可以提高第一区域121a和第一周面122c在照片中的对比度，便于CCD捕捉第一周面122c，改善定位性能。当然，为了使CCD能够拍摄到第一区域121a，通孔41应将第一区域121a的至少部分露出。
第一区域121a的粗糙度为1μm-14μm。如果第一区域121a的粗糙度小于1μm，那么对第一区域121a和第一周面122c在照片中的对比度的影响较小。如果第一区域121a的粗糙度大于14μm，会导致第一区域121a的平整性过差；当汇流条4与第一区域121a和第二区域121b贴合时，造成汇流条4的平稳性差。在一些示例中，第一区域121a的粗糙度1.2μm-7μm。
汇流条4可焊接于外表面121的第二区域121b。如果第二区域121b的粗糙度过大，当汇流条4焊接于第二区域121b时，容易导致焊接不良。因此，第二区域121b的粗糙度小于第一区域121a的粗糙度。
沿远离外表面121的方向，第二部分122b的尺寸逐渐减小。第二部分122b的第二周面122d为圆弧面。
在本发明中，电极端子12设置于顶盖板11的一侧，电极端子12无需穿过顶盖板11的端子孔，因此，电极端子12可具有较小的厚度。然而，在二次电池的工作过程中，壳体3内部会产生气体，气体会对顶盖板11和电极端子12施加压力。而由于电极端子12的厚度较小，所以电极端子12在气体压力的作用下变形。然而，压力会向电极端子12的定位孔122处集中，如果气体压力过大，会导致电极端子12破裂。而本发明在定位孔122的底部设置圆角，进而形成圆弧形的第二周面122d。圆弧形的第二周面122d可以分散应力，降低电极端子12破裂的风险。
所述顶盖组件1还包括固定构件13，固定构件13连接顶盖板11和电极端子12，电极端子12的边缘位于固定构件13和顶盖板11之间。
固定构件13可包括固定片131和绝缘件132，固定件131可通过焊接固定于顶盖板11，绝缘件132集成到固定片131上并将固定片131和电极 端子12隔开。绝缘件132可环绕在电极端子12的外侧，且电极端子12的边缘位于绝缘件132和顶盖板11之间。绝缘件132可以将电极端子12紧压在顶盖板11上，避免电极端子12从顶盖板11上脱离。
当然，由于电极端子12的边缘受到绝缘件132的限制，而电极端子12设有定位孔122的中部区域容易在气体压力的作用下鼓起变形。如果不设置圆弧形的第二周面122d，电极端子12容易在气体压力的作用下破裂。
对于与负极极片电连接的电极端子12，其可为金属复合板。具体地，电极端子12可包括铝质的第一端子板123和铜质的第二端子板124，第一端子板123和第二端子板124可通过冷轧法、热轧法、爆炸复合法或爆炸轧制法等方式复合为一体。第一端子板123位于第二端子板124的远离顶盖板11的一侧。
采用铜质的第二端子板124方便第二端子板124与负极片连接。汇流条4的材质通常为铝，采用铝制的第一端子板123便于第一端子板123与汇流条4的焊接。
定位孔122形成于第一端子板123。也就是说，定位孔122的深度小于第一端子板123的厚度。这样可以避免第一端子板123和第二端子板124的复合界面露出，防止第一端子板123和第二端子板124分离。
本领域技术人员应能理解，上述实施例均是示例性而非限制性的。在不同实施例中出现的不同技术特征可以进行组合，以取得有益效果。本领域技术人员在研究附图、说明书及权利要求书的基础上，应能理解并实现所揭示的实施例的其他变化的实施例。在权利要求书中，术语“包括”并不排除其他装置或步骤；物品没有使用数量词修饰时旨在包括一个/种或多个/种物品，并可以与“一个/种或多个/种物品”互换使用”；术语“第一”、“第二”用于标示名称而非用于表示任何特定的顺序。权利要求中的任何附图标记均不应被理解为对保护范围的限制。权利要求中出现的多个部分的功能可以由一个单独的硬件或软件模块来实现。某些技术特征出现在不同的从属权利要求中并不意味着不能将这些技术特征进行组合以取得有益效果。

Claims (15)

  1. 一种二次电池的顶盖组件，包括：
    顶盖板，设置有端子孔；以及
    电极端子，覆盖所述端子孔；
    所述电极端子具有外表面，所述电极端子包括定位孔，所述定位孔相对于所述电极端子的所述外表面凹陷且包括第一部分和第二部分，所述第二部分位于所述第一部分远离所述外表面的一侧，所述第一部分的平行于所述定位孔的中心轴的截面为梯形；
    沿所述第一部分靠近所述第二部分的方向，所述第一部分的孔径尺寸逐渐减小，且所述第一部分的最小孔径尺寸大于或等于所述第二部分的孔径尺寸。
  2. 根据权利要求1所述的顶盖组件，其中，所述第一部分具有第一周面，所述第一周面与所述外表面的夹角为135度-175度。
  3. 根据权利要求1或2所述的顶盖组件，其中，
    所述第一部分具有第一周面；
    所述外表面包括第一区域和第二区域，所述第一区域环绕在所述第一周面外侧且与所述第一周面相连，所述第二区域环绕在所述第一区域外侧且与所述第一区域相连；
    所述第一区域的粗糙度大于所述第一周面的粗糙度。
  4. 根据权利要求3所述的顶盖组件，其中，第一区域的粗糙度为1μm-14μm。
  5. 根据权利要求1-4中任一项所述的顶盖组件，其中，
    沿所述第二部分远离所述第一部分的方向，所述第二部分的尺寸逐渐减小；
    所述第二部分具有第二周面，所述第二周面为圆弧面。
  6. 根据权利要求1-5中任一项所述的顶盖组件，其中，所述第二部分的形状与所述第一部分的形状不同。
  7. 根据权利要求1-6中任一项所述的顶盖组件，其中，所述定位孔还包括第三部分，所述第三部分为柱形且位于所述第一部分和所述第二部分之间。
  8. 根据权利要求1-7中任一项所述的顶盖组件，其中，所述电极端子包括第一端子板和第二端子板，所述第一端子板位于所述第二端子板的远离所述顶盖板的一侧；
    所述第一端子板由铝制成，所述第二端子板由铜制成；
    所述定位孔形成于所述第一端子板，且所述定位孔的深度小于所述第一端子板的厚度。
  9. 根据权利要求1-8中任一项所述的顶盖组件，其中，所述顶盖组件还包括固定构件，所述固定构件连接所述顶盖板和所述电极端子，所述电极端子的边缘位于所述固定构件和所述顶盖板之间。
  10. 根据权利要求1-9中任一项所述的顶盖组件，其中，所述电极端子设置于所述顶盖板的一侧。
  11. 根据权利要求1-10中任一项所述的顶盖组件，其中，所述顶盖组件还包括连接片，所述连接片设置有凸包，所述凸包伸入所述端子孔中且与所述电极端子连接。
  12. 根据权利要求1-11中任一项所述的顶盖组件，其中，所述顶盖组件还包括密封圈，所述密封圈设置于所述顶盖板和所述电极端子之间。
  13. 一种二次电池，包括：
    壳体；
    电极组件，收容于所述壳体内；以及
    如权利要求1-12中任一项所述的顶盖组件，所述顶盖组件的顶盖板与所述壳体连接，所述顶盖组件的电极端子设置于所述顶盖板的远离所述电极组件的一侧。
  14. 一种电池模组，包括：
    如权利要求13所述的二次电池；
    汇流条，与所述二次电池的顶盖组件的电极端子连接，且所述汇流条具有与所述电极端子的定位孔上下相对的通孔；
    所述通孔将所述定位孔的第一部分的第一周面露出，且所述第一周面露出的面积与所述第一周面的总面积之比大于2/3。
  15. 根据权利要求14所述的电池模组，其中，所述汇流条焊接于所述电极端子的外表面的第二区域，所述通孔将所述外表面的第一区域的至少部分露出。
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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN209880723U (zh) * 2019-04-26 2019-12-31 宁德时代新能源科技股份有限公司 电池模组、二次电池及其顶盖组件
JP7446202B2 (ja) * 2020-11-16 2024-03-08 プライムプラネットエナジー＆ソリューションズ株式会社 電池および電池の製造方法
DE102020216323A1 (de) 2020-12-18 2022-06-23 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren und Vorrichtung zur elektrischen Kontaktierung von Zellen einer Batterie
CN112713341B (zh) * 2020-12-31 2023-04-28 中创新航科技股份有限公司 盖板组件及其制备方法、电池与电池模组

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006019220A (ja) * 2004-07-05 2006-01-19 Japan Storage Battery Co Ltd 電池
US20110300435A1 (en) * 2010-06-04 2011-12-08 Sangwon Byun Rechargeable battery
CN205723741U (zh) * 2016-05-24 2016-11-23 宁德时代新能源科技股份有限公司 单体电池及电池模组
CN207183342U (zh) * 2017-07-04 2018-04-03 宁德时代新能源科技股份有限公司 电池模组
CN208507744U (zh) * 2018-06-27 2019-02-15 中航锂电（洛阳）有限公司 电池连接件及电池
CN209880723U (zh) * 2019-04-26 2019-12-31 宁德时代新能源科技股份有限公司 电池模组、二次电池及其顶盖组件

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002124218A (ja) * 2000-10-16 2002-04-26 Toshiba Battery Co Ltd 円筒形電池
JP4236826B2 (ja) * 2001-04-02 2009-03-11 三菱電機株式会社 パワーモジュールおよびその製造方法
JP4452846B2 (ja) * 2004-04-02 2010-04-21 Ｄｏｗａメタルテック株式会社 金属−セラミックス接合基板及びその製造方法
WO2014064888A1 (ja) * 2012-10-26 2014-05-01 三洋電機株式会社 電源装置及び電源装置を備える電動車両並びに蓄電装置、電源装置の製造方法
US9350127B2 (en) * 2014-03-24 2016-05-24 Ford Global Technologies, Llc Self-locating busbar assembly and alignment method
KR102368085B1 (ko) 2015-03-03 2022-02-24 삼성에스디아이 주식회사 연결부재를 갖는 이차 전지
CN105845851B (zh) 2016-06-07 2018-07-17 宁德时代新能源科技股份有限公司 动力电池顶盖及其动力电池
KR102454791B1 (ko) * 2017-06-13 2022-10-14 삼성에스디아이 주식회사 양극 단자와 멤브레인 일체형 캡 플레이트를 갖는 이차 전지
JP6565973B2 (ja) * 2017-06-29 2019-08-28 日亜化学工業株式会社 実装用部品、それを用いた半導体装置及びその製造方法
CN207353302U (zh) 2017-09-18 2018-05-11 宁德时代新能源科技股份有限公司 动力电池顶盖组件、动力电池以及电池模组
CN109659454B (zh) * 2017-10-10 2020-11-10 宁德时代新能源科技股份有限公司 二次电池的顶盖组件以及二次电池
JP7027790B2 (ja) * 2017-10-17 2022-03-02 三洋電機株式会社 二次電池の製造方法
US10763466B2 (en) * 2018-03-09 2020-09-01 Contemporary Amperex Technology Co., Limited Top cap assembly of a secondary battery, and secondary battery
CN208622794U (zh) * 2018-08-01 2019-03-19 宁德时代新能源科技股份有限公司 二次电池及其顶盖组件

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006019220A (ja) * 2004-07-05 2006-01-19 Japan Storage Battery Co Ltd 電池
US20110300435A1 (en) * 2010-06-04 2011-12-08 Sangwon Byun Rechargeable battery
CN205723741U (zh) * 2016-05-24 2016-11-23 宁德时代新能源科技股份有限公司 单体电池及电池模组
CN207183342U (zh) * 2017-07-04 2018-04-03 宁德时代新能源科技股份有限公司 电池模组
CN208507744U (zh) * 2018-06-27 2019-02-15 中航锂电（洛阳）有限公司 电池连接件及电池
CN209880723U (zh) * 2019-04-26 2019-12-31 宁德时代新能源科技股份有限公司 电池模组、二次电池及其顶盖组件

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