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WO2023144176A1 - Structure for a cylindrical secondary cell - Google Patents

Structure for a cylindrical secondary cell Download PDF

Info

Publication number
WO2023144176A1
WO2023144176A1 PCT/EP2023/051747 EP2023051747W WO2023144176A1 WO 2023144176 A1 WO2023144176 A1 WO 2023144176A1 EP 2023051747 W EP2023051747 W EP 2023051747W WO 2023144176 A1 WO2023144176 A1 WO 2023144176A1
Authority
WO
WIPO (PCT)
Prior art keywords
pin
current collecting
collecting plate
electrode roll
roll assembly
Prior art date
Application number
PCT/EP2023/051747
Other languages
French (fr)
Inventor
Michael KOMA
Original Assignee
Northvolt Ab
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 Northvolt Ab filed Critical Northvolt Ab
Publication of WO2023144176A1 publication Critical patent/WO2023144176A1/en

Links

Classifications

    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • 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

Definitions

  • the present disclosure generally relates to secondary batteries and components thereof. More specifically, the disclosure relates to a structure for a cylindrical secondary cell, and a method of manufacturing a structure for a cylindrical secondary cell.
  • lithium-ion batteries are becoming increasingly popular, representing a type of rechargeable battery in which lithium ions move from the negative electrode to the positive electrode during discharge and back when charging.
  • a structure for a cylindrical secondary cell comprises a positive terminal part, a negative terminal part and an electrode roll assembly.
  • the structure comprises a current collecting plate configured to be arranged in direct electrical contact with the electrode roll assembly and one of the positive terminal part and the negative terminal part, and a pin attached to the current collecting plate at an end portion of the pin, whereby the pin extends perpendicular to the surface of the current collecting plate, and wherein the pin is configured to extend through the center of the electrode roll assembly and provide a conduit through the electrode roll assembly for gas evacuation.
  • a method of manufacturing a structure for a cylindrical secondary cell comprising a positive terminal part, a negative terminal part and an electrode roll assembly.
  • the method comprises attaching a pin to a current collecting plate configured to be arranged in direct electrical contact with the electrode roll assembly and one of the positive terminal part and the negative terminal part, at an end portion of the pin, whereby the pin extends perpendicular to the surface of the current collecting plate, wherein the pin is configured to extend through the center of the electrode roll assembly and provide a conduit through the electrode roll assembly for gas evacuation.
  • a method of manufacturing a cylindrical secondary cell comprises attaching the pin to a first current collecting plate at a first end portion of the pin, whereby the pin extends perpendicular to the surface of the first current collecting plate, arranging the structure such that the pin extends through the center of the electrode roll assembly, and attaching the pin to a second current collecting plate at a second end portion of the pin.
  • the first, second and third aspects of the disclosure comprise the common concept of a structure comprising a pin with a current collecting plate attached to the pin, wherein the structure is arranged or configured to form part of a cylindrical secondary cell.
  • the pin of the structure is advantageous in that the pin is able to stabilize the electrode roll assembly.
  • the pin of the structure is advantageous in that the pin provides a conduit through the electrode roll assembly for gas evacuation.
  • the structure of the first aspect of the disclosure is particularly advantageous in that the attachment of the pin to the current collecting plate provides a stabilization of the electrode roll assembly which is highly improved, notably by the effect of a hindered and/or mitigated movement of the pin when arranged in the cylindrical secondary cell.
  • the structure of the first aspect of the disclosure is particularly advantageous in that the attachment of the pin to the current collecting plate avoids or mitigates damage to the current collecting plate. Consequently, the structure of the first aspect of the disclosure contributes to an improved operation of a cylindrical secondary cell and/or to an improved service life of a cylindrical secondary cell.
  • the structure of the first aspect of the disclosure is particularly advantageous in that the conduit within the electrode roll assembly allows gas produced towards the bottom of the electrode roll assembly to be vented through the centre of the electrode roll, preventing excess localised pressure build-up. It also allows gas generated at either end of the electrode roll assembly to be channelled through the conduit in order to prevent or limit localised pressure build-up within the cell.
  • the method of the third aspect of the disclosure is advantageous in that the manufacturing of the cylindrical secondary cell becomes more efficient and/or convenient. More specifically, by providing the structure of the first aspect of the disclosure by the pin attached to the current collecting plate, the steps of assembling the cylindrical secondary cell are reduced.
  • the structure comprises a current collecting plate, also referred to as an electrode lead plate, which is configured to be arranged in direct electrical contact with the electrode roll assembly and one of the positive terminal part and the negative terminal part.
  • the structure comprises a single (first) current collecting plate
  • the current collecting plate is arranged in direct electrical contact with the electrode roll assembly and a single (first) terminal part (e.g. anode).
  • the structure comprises two current collecting plates, i.e.
  • each current collecting plate may be one single component electrically coupled between the electrode roll assembly and the respective terminal part. In other words, the current collecting plate may be the only component electrically coupled between the electrode roll assembly and the terminal part.
  • a pin also referred to as central pin, is attached to the current collecting plate (i.e. attached to one or two current collecting plate(s)) at a respective end portion of the pin, whereby the pin extends perpendicular to the surface of the current collecting plate.
  • the structure may have a “T” profile.
  • the structure may have a barbell profile.
  • the pin is configured to extend through the center of the electrode roll assembly. Hence, when the structure is arranged in the cylindrical secondary cell, the pin may extend through the center of the electrode roll assembly.
  • the pin is configured to provide a conduit through the electrode roll assembly for gas evacuation.
  • the structure may comprise a single current collecting plate, wherein the pin is attached to the single current collecting plate at a first end portion of the pin.
  • the cylindrical secondary cell may comprise a (first) current collecting plate.
  • a second end portion of the pin may comprise an electrical insulation material.
  • the structure comprises a single current collecting plate, wherein the pin is attached to the current collecting plate by a first end portion of the pin, the second end portion of the pin may comprise an electrical insulation material.
  • the structure may comprise two current collecting plates, wherein the pin is attached to a first current collecting plate at a first end portion of the pin, and wherein the pin is attached to a second current collecting plate at a second end portion of the pin.
  • the pin may be tapered in a direction from the current collecting plates. Hence, from the current collecting plate and along the pin, the cross-section of the pin may decrease.
  • the pin may have a cylinder shape. Hence, the pin may have an (outer) surface which is round in its cross-section.
  • the pin may be hollow.
  • the present embodiment is advantageous in that the pin may be lighter in weight and/or be more cost efficient compared to e.g. a pin of solid material.
  • the present embodiment is further advantageous in that an attachment of the pin to the current collecting plate may be made by laser welding through the hollow pin.
  • an inner section of a cross-section of the pin may have a polygonal shape.
  • the present embodiment is advantageous in that the pin may conveniently enable a tool, a device, or the like, to be inserted into the pin for a rotation of the structure during a manufacturing of a cylindrical secondary cell. Consequently, the structure may conveniently enable a winding of an electrode roll assembly, e.g. of a relatively large diameter.
  • the pin may be attached to the current collecting plate by a laser weld.
  • the embodiment is advantageous in that the laser weld may provide a strong connection and/or seal between the pin and the current collecting plate(s).
  • the current collecting plate may comprise at least one hole.
  • the provision of one or more holes, i.e. so called electrolyte flow holes, is advantageous in that a welding and/or soldering operation may be facilitated.
  • the (electrolyte flow) holes may be arranged in a pattern on the current collecting plate, which pattern allows welding the current collecting plate to the by a plurality of nonintersecting straight weld lines that extend across the current collecting plate.
  • the current collecting plate may be disc-shaped.
  • disc-shaped it is here meant a substantially flat and/or relatively thin form of the current collecting plate, wherein the form furthermore may be round.
  • the embodiment is advantageous in that the discshaped form of the current collecting plate may conform to the intended shape of the cylindrical secondary cell.
  • the pin is hollow, and wherein the current collecting plate comprises a through hole at the center of the collecting plate, for allowing an application of a suction device for a suction from the pin via a funnel-shaped element provided at the through hole.
  • the present embodiment is advantageous in that a seal is achieved between the tube/current collecting plate and the funnel-shaped element (e.g. suction cup), which increase the mechanical connection area.
  • the present embodiment is further advantageous in that a greater airflow may be achieved in the hollow pin during a suction operation (e.g. suction of debris) compared to an arrangement in which there is no current collecting plate and/or there is no adequate fastening, seal and/or weld between the current collecting plate and the pin.
  • a suction operation e.g. suction of debris
  • the pin may comprise an engagement portion, wherein an inner surface of the first engagement portion comprises an engagement profile configured to engage with a torque-applying tool to thereby enable the pin to be rotated about a longitudinal axis of the pin by the torque-applying tool.
  • the pin may comprise a recess on an outer surface of the pin, extending along the length of the pin, configured to receive an edge of the electrode roll assembly.
  • the pin may be hollow and wherein the method comprises attaching the pin to the current collecting plate by laser welding through the pin.
  • the present embodiment is advantageous in that the hollow pin conveniently provides for a laser welding through the pin for attachment of the pin to the current collecting plate.
  • a cylindrical secondary cell comprises a positive terminal part, a negative terminal part, an electrode roll assembly, and the structure according to any one of the previously described embodiments, wherein the structure comprises two current collecting plates.
  • Fig. 1 is a schematic illustration of a cross-section of a cylindrical secondary cell.
  • Fig. 2 is a schematic illustration of an exploded view of a cylindrical secondary cell.
  • Figs. 3a-3c and Figs. 4a-4d are schematic illustrations of structures for a cylindrical secondary cell.
  • Figs. 5a and 5b are schematic illustrations of current collecting plates of a structure for a cylindrical secondary cell.
  • Fig. 6 is a schematic illustration of a cross-section of a cylindrical secondary cell and an application of a suction device to the cylindrical secondary cell.
  • Fig. 7 is a schematic illustration of a method of manufacturing a cylindrical secondary cell.
  • Fig. 1 is a schematic illustration of a cylindrical secondary cell 1 (also referred to as cell).
  • the cell 1 is exemplified with a cylindrical enclosure 2 with a first enclosure end 2a (the top end in Fig. 1 ) and an opposite second enclosure end 2b (not shown).
  • the cylindrical enclosure 2 may also be referred to as a can.
  • An electrode roll assembly 3 is arranged inside the cylindrical enclosure 2.
  • the first enclosure end 2a may be formed in one piece with the cylindrical enclosure 2 (as illustrated in Fig. 1 ) and the second enclosure end 2b may be formed by a separate second enclosure end lid (not shown), or vice versa.
  • the cell 1 relates to a cell 1 of a type that has both a positive terminal 4 and a negative terminal 5 at one and the same end (the top end in Fig. 1 ) of the cylindrical secondary cell 1 .
  • the first enclosure end 2a comprises a central terminal through-hole 2c for the positive terminal 4.
  • the negative terminal 5 is electrically connected to the cylindrical enclosure 2. More precisely, the negative terminal 5 is formed by the top surface of the cylindrical enclosure 2 that surrounds the terminal through-hole 2c. Thus, the entire cylindrical enclosure 2 (apart from the positive terminal 4 at the top end) may be the negative terminal 5.
  • a cylindrical secondary cell 1 having both terminals 4, 5 at one end may bring advantages as regards electrically connecting the cell 1 to a load. Conductors electrically connecting the terminals 4, 5 to the load may be positioned on the same end, the terminal end, of the cell 1 .
  • the electrode roll assembly 3 comprises a first and a second conductive sheet 3a, 3b and separating means (not shown).
  • the separating means may also be termed separator.
  • the conductive sheets 3a, 3b and the separating means are rolled to form a circular cylindrical roll defining a central channel 3c.
  • the sheets 3a, 3b are coated with electrode coatings and on assembly of the cell 1 .
  • the coatings on the conductive sheets 3a, 3b act as cathode and anode, respectively.
  • the cathode, anode and electrolyte provide electrochemical energy storage. This principle is known per se, and the electrode roll assembly 3 is commonly referred to as a jellyroll.
  • the sheets 3a, 3b of the electrode roll assembly 3 are axially offset in relation to one another, and each comprises an end section that is not coated with electrode coating.
  • Fig. 1 only one end of the electrode roll assembly 3 is shown, and at this end the first conductive sheet 3a protrudes axially from the electrode roll assembly 3.
  • the second conductive sheet 3b protrudes axially.
  • the second electrode roll 3b is schematically indicated by a dashed arrow in Fig. 1.
  • Fig. 2 is a schematic illustration of an exploded view of a cylindrical secondary cell 1.
  • the cylindrical secondary cell 1 comprises a cylindrical enclosure 15, which may also be referred to as a can.
  • the cylindrical enclosure 15 encloses the electrode roll assembly 3.
  • the cylindrical secondary cell 1 comprises a structure 2 which in turn comprises current collecting plates 6a, 6b, namely an anode disc 6a and a cathode disc 6b.
  • a pin 7 of the structure 2 is attached to the (first) current collecting plate 6a (anode) and/or to the (second) current collecting plate 6b.
  • Figs. 3a-3c are schematic illustrations of a structure 2 for a cylindrical secondary cell as exemplified in Fig. 1 , of which Figs. 3a and 3b show an embodiment of the structure 2 from different angles.
  • the structure 2 comprises a (single) current collecting plate 6a.
  • the current collecting plate 6a of the structure 2 When assembled in the cell 1 , the current collecting plate 6a of the structure 2 is configured to be arranged in direct electrical contact with the electrode roll assembly 3 of the cell 1 , more precisely with the non-coated end section of the first conductive sheet 3a of the cell 1 .
  • the current collecting plate 6a is configured to be arranged in direct electrical and direct physical contact with the first conductive sheet 3a of the cell 1 .
  • the structure 2 further comprises a (central) pin 7 which is attached or fastened to the current collecting plate 6a by an end portion 7a of the pin 7.
  • the pin 7 extends perpendicular to the surface of the current collecting plate 6a.
  • the pin 7 is configured to extend through the center of the electrode roll assembly 3 of the cell 1 .
  • the structure 2 may have a “T” profile.
  • the pin 7 provides a conduit through the electrode roll assembly 3 for gas evacuation.
  • Fig. 3c schematically illustrates an alternative embodiment of the structure 2 as exemplified in Fig. 3a.
  • the structure 2 comprises two current collecting plates 6a, 6b, wherein the pin 7 is attached to a first current collecting plate 6a at a first end portion 7a of the pin 7, and wherein the pin 7 is attached to a second current collecting plate 6b at a second end portion 7b of the pin 7.
  • the structure 2 has a barbell profile.
  • Figs. 4a-d are schematic illustrations of structures 2 for a cylindrical secondary cell. As the structures 2 shown in Figs. 4a-d have similar and/or same features as in Figs. 3a-c, it is also referred to Figs. 3a-c for an increased understanding.
  • Fig. 4a at least a portion of the pin 7 is tapered in a direction from the current collecting plate 6a, i.e. having a smaller diameter in crosssection at least along a portion of the length of the pin 7.
  • a second end portion 7b of the pin 7, which in this case is not attached to any current collecting plate comprises an electrical insulation material 8.
  • Fig. 4c shows an example of a cross-section of the pin 7.
  • the pin 7 is hollow and the pin 7 has a cylinder shape with an inner (cross) section which is circular and with an outer (cross) section which is circular.
  • Fig. 4d shows another example of a cross-section of the pin 7, wherein the pin 7 is hollow and the pin 7 has an inner (cross) section which is polygonal and with an outer (cross) section which is circular.
  • Fig. 5a shows the current collecting plate 6a of the structure 2 in more detail.
  • the current collecting plate 6a of Fig. 5a may be used in cylindrical secondary cells and with terminal parts of other design than the ones described herein.
  • the current collecting plate 6a is configured to be arranged in direct electrical contact with a conductive sheet 3a of an electrode roll assembly 3 and in direct electrical contact with a terminal part 4 as previously described.
  • the terminal part 4 may form an external terminal of the cell 1.
  • the current collecting plate 6a of Fig. 5a comprises a first end surface 11 a and an opposite second end surface 11 b. When assembled, the first end surface 11 a faces away from the electrode roll assembly 3 and the second end surface 11 b faces the electrode roll assembly 3.
  • the 5a comprises an inner contact region 6c and an outer contact region 6e.
  • the outer contact region comprises a number of electrolyte flow holes 6g, which will be described below.
  • the cell 1 is circular cylindrical and the current collecting plate 6a has the general shape of a circular disc.
  • the inner contact region 6c is configured to be arranged in direct electrical contact with the terminal part 4 and the outer contact region 6e is configured to be arranged in direct electrical contact with the first conductive sheet 3a.
  • Fig. 5b shows another embodiment of a current collecting plate 6a of the structure 2 according to one or more of the previously described examples.
  • Fig. 5b corresponds to the current collecting plate of Fig. 5a but lacks through-holes in the fuse region 6d and lacks electrolyte flow holes 6g.
  • the current conducting area of the fuse region 6d is decreased solely by an indentation.
  • Fig. 6 is a schematic illustration of a cross-section of a cylindrical secondary cell 1 .
  • a structure 2 according to one or more of the previously described examples, is arranged in the cylindrical secondary cell 1.
  • the structure 2 comprises a current collecting plate 6a with a through hole 12 at the center of the current collecting plate 6a.
  • a hollow pin 7 is attached to the current collecting plate 6a.
  • the pin 7 extends through the center of the electrode roll assembly 3 of the cylindrical secondary cell 1.
  • the pin 7 provides a conduit through the electrode roll assembly 3 for gas evacuation.
  • the cylindrical secondary cell 1 as exemplified allows for an application of a suction device for suction of debris from the hollow center pin 7.
  • the suction device comprises a funnel-shaped element 13 (e.g. a suction cup) which may be applied to the (flat) current collecting plate 6a, for a suction from the pin 7 via the through hole 12 of the current collecting plate 6a.
  • Fig. 7 is a schematic illustration of a method of manufacturing a cylindrical secondary cell.
  • the method comprises attaching the pin 7 of the strcuture 2 to the first current collecting plate 6a at a first end portion 7a of the pin 7, whereby the pin 7 extends perpendicular to the surface of the first current collecting plate 6a.
  • the method further comprises arranging the structure 2 such that the pin 7 extends through the center of the electrode roll assembly 3 in the cylindrical secondary cell.
  • the method further comprises attaching the pin 7 to the second current collecting plate 6b at a second end portion (not shown) of the pin 7.

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

Abstract

A structure (2) for a cylindrical secondary cell (1), a corresponding method of manufacturing the structure, a cylindrical secondary cell (1) comprising the 5 structure, and a corresponding method of manufacturing the cylindrical secondary cell, are provided. The structure (2) comprises respective terminal parts (4, 5) and an electrode roll assembly (3), wherein the structure (2) comprises a current collecting plate (6a, 6b), wherein the current collecting plate (6a, 6b) is configured to be arranged in direct electrical contact with the 10 electrode roll assembly (3) and a respective terminal part (4, 5), and a pin (7) attached to the current collecting plate (6a, 6b) at a respective end portion (7a, 7b) of the pin (7), whereby the pin (7) extends perpendicular to the surface of the current collecting plate (6a, 6b), wherein the pin (7) is configured to extend through the center of the electrode roll assembly (3).

Description

STRUCTURE FOR A CYLINDRICAL SECONDARY CELL
Technical field
The present disclosure generally relates to secondary batteries and components thereof. More specifically, the disclosure relates to a structure for a cylindrical secondary cell, and a method of manufacturing a structure for a cylindrical secondary cell.
Background
In addressing climate change there is an increasing demand for rechargeable batteries, e.g. to enable electrification of transportation and to supplement renewable energy. Currently, lithium-ion batteries are becoming increasingly popular, representing a type of rechargeable battery in which lithium ions move from the negative electrode to the positive electrode during discharge and back when charging.
As the demand for rechargeable batteries increases, more and more focus is being placed on production speed. To achieve an effective production of rechargeable batteries, the design of the batteries as well as their manufacturing process can be optimized.
Summary
It is an object of the disclosure to propose a structure for a cylindrical secondary cell, wherein the structure improves one or more properties of the secondary cells. It is also an object of the disclosure to propose a method of manufacturing a structure for a cylindrical secondary cell.
According to a first aspect, there is provided a structure for a cylindrical secondary cell. The cylindrical secondary cell comprises a positive terminal part, a negative terminal part and an electrode roll assembly. The structure comprises a current collecting plate configured to be arranged in direct electrical contact with the electrode roll assembly and one of the positive terminal part and the negative terminal part, and a pin attached to the current collecting plate at an end portion of the pin, whereby the pin extends perpendicular to the surface of the current collecting plate, and wherein the pin is configured to extend through the center of the electrode roll assembly and provide a conduit through the electrode roll assembly for gas evacuation.
According to a second aspect, there is provided a method of manufacturing a structure for a cylindrical secondary cell, the cylindrical secondary cell comprising a positive terminal part, a negative terminal part and an electrode roll assembly. The method comprises attaching a pin to a current collecting plate configured to be arranged in direct electrical contact with the electrode roll assembly and one of the positive terminal part and the negative terminal part, at an end portion of the pin, whereby the pin extends perpendicular to the surface of the current collecting plate, wherein the pin is configured to extend through the center of the electrode roll assembly and provide a conduit through the electrode roll assembly for gas evacuation.
According to a third aspect, there is provided a method of manufacturing a cylindrical secondary cell. The method comprises attaching the pin to a first current collecting plate at a first end portion of the pin, whereby the pin extends perpendicular to the surface of the first current collecting plate, arranging the structure such that the pin extends through the center of the electrode roll assembly, and attaching the pin to a second current collecting plate at a second end portion of the pin.
Thus, the first, second and third aspects of the disclosure comprise the common concept of a structure comprising a pin with a current collecting plate attached to the pin, wherein the structure is arranged or configured to form part of a cylindrical secondary cell. It will be appreciated that the pin of the structure is advantageous in that the pin is able to stabilize the electrode roll assembly. Furthermore, the pin of the structure is advantageous in that the pin provides a conduit through the electrode roll assembly for gas evacuation. The structure of the first aspect of the disclosure is particularly advantageous in that the attachment of the pin to the current collecting plate provides a stabilization of the electrode roll assembly which is highly improved, notably by the effect of a hindered and/or mitigated movement of the pin when arranged in the cylindrical secondary cell. Furthermore, the structure of the first aspect of the disclosure is particularly advantageous in that the attachment of the pin to the current collecting plate avoids or mitigates damage to the current collecting plate. Consequently, the structure of the first aspect of the disclosure contributes to an improved operation of a cylindrical secondary cell and/or to an improved service life of a cylindrical secondary cell.
The structure of the first aspect of the disclosure is particularly advantageous in that the conduit within the electrode roll assembly allows gas produced towards the bottom of the electrode roll assembly to be vented through the centre of the electrode roll, preventing excess localised pressure build-up. It also allows gas generated at either end of the electrode roll assembly to be channelled through the conduit in order to prevent or limit localised pressure build-up within the cell.
The method of the third aspect of the disclosure is advantageous in that the manufacturing of the cylindrical secondary cell becomes more efficient and/or convenient. More specifically, by providing the structure of the first aspect of the disclosure by the pin attached to the current collecting plate, the steps of assembling the cylindrical secondary cell are reduced.
There is provided a structure for a cylindrical secondary cell, wherein the cylindrical secondary cell comprises a positive terminal part, a negative terminal part and an electrode roll assembly. The electrode roll assembly of the cylindrical secondary cell comprises a so-called jelly roll. The structure comprises a current collecting plate, also referred to as an electrode lead plate, which is configured to be arranged in direct electrical contact with the electrode roll assembly and one of the positive terminal part and the negative terminal part. Hence, in case the structure comprises a single (first) current collecting plate, the current collecting plate is arranged in direct electrical contact with the electrode roll assembly and a single (first) terminal part (e.g. anode). Alternatively, in case the structure comprises two current collecting plates, i.e. a (first) current collecting plate and a second current collecting plate, the (first) current collecting plate is arranged in direct electrical contact with the electrode roll assembly and a (first) terminal part (e.g. anode), whereas the (second) current collecting plate is arranged in direct electrical contact with the electrode roll assembly and a (second) terminal part (e.g. cathode). Each current collecting plate may be one single component electrically coupled between the electrode roll assembly and the respective terminal part. In other words, the current collecting plate may be the only component electrically coupled between the electrode roll assembly and the terminal part.
A pin, also referred to as central pin, is attached to the current collecting plate (i.e. attached to one or two current collecting plate(s)) at a respective end portion of the pin, whereby the pin extends perpendicular to the surface of the current collecting plate. Hence, in case of the pin being attached to a (single) current collecting plate, the structure may have a “T” profile. Alternatively, in case of the pin being attached to two current collecting plates at respective end portions of the pin, the structure may have a barbell profile. The pin is configured to extend through the center of the electrode roll assembly. Hence, when the structure is arranged in the cylindrical secondary cell, the pin may extend through the center of the electrode roll assembly. The pin is configured to provide a conduit through the electrode roll assembly for gas evacuation.
According to an embodiment of the disclosure, the structure may comprise a single current collecting plate, wherein the pin is attached to the single current collecting plate at a first end portion of the pin. For example, the cylindrical secondary cell may comprise a (first) current collecting plate.
According to an embodiment of the disclosure, a second end portion of the pin may comprise an electrical insulation material. Hence, in case the structure comprises a single current collecting plate, wherein the pin is attached to the current collecting plate by a first end portion of the pin, the second end portion of the pin may comprise an electrical insulation material.
According to an embodiment of the disclosure, the structure may comprise two current collecting plates, wherein the pin is attached to a first current collecting plate at a first end portion of the pin, and wherein the pin is attached to a second current collecting plate at a second end portion of the pin.
According to an embodiment of the disclosure, at least a portion of the pin may be tapered in a direction from the current collecting plates. Hence, from the current collecting plate and along the pin, the cross-section of the pin may decrease. According to an embodiment of the disclosure, the pin may have a cylinder shape. Hence, the pin may have an (outer) surface which is round in its cross-section.
According to an embodiment of the disclosure, the pin may be hollow. The present embodiment is advantageous in that the pin may be lighter in weight and/or be more cost efficient compared to e.g. a pin of solid material. The present embodiment is further advantageous in that an attachment of the pin to the current collecting plate may be made by laser welding through the hollow pin.
According to an embodiment of the disclosure, an inner section of a cross-section of the pin may have a polygonal shape. The present embodiment is advantageous in that the pin may conveniently enable a tool, a device, or the like, to be inserted into the pin for a rotation of the structure during a manufacturing of a cylindrical secondary cell. Consequently, the structure may conveniently enable a winding of an electrode roll assembly, e.g. of a relatively large diameter.
According to an embodiment of the disclosure, the pin may be attached to the current collecting plate by a laser weld. The embodiment is advantageous in that the laser weld may provide a strong connection and/or seal between the pin and the current collecting plate(s).
According to an embodiment of the disclosure, the current collecting plate may comprise at least one hole. The provision of one or more holes, i.e. so called electrolyte flow holes, is advantageous in that a welding and/or soldering operation may be facilitated. For example, the (electrolyte flow) holes may be arranged in a pattern on the current collecting plate, which pattern allows welding the current collecting plate to the by a plurality of nonintersecting straight weld lines that extend across the current collecting plate.
According to an embodiment of the disclosure, the current collecting plate may be disc-shaped. By “disc-shaped”, it is here meant a substantially flat and/or relatively thin form of the current collecting plate, wherein the form furthermore may be round. The embodiment is advantageous in that the discshaped form of the current collecting plate may conform to the intended shape of the cylindrical secondary cell. According to an embodiment of the disclosure, the pin is hollow, and wherein the current collecting plate comprises a through hole at the center of the collecting plate, for allowing an application of a suction device for a suction from the pin via a funnel-shaped element provided at the through hole. The present embodiment is advantageous in that a seal is achieved between the tube/current collecting plate and the funnel-shaped element (e.g. suction cup), which increase the mechanical connection area. The present embodiment is further advantageous in that a greater airflow may be achieved in the hollow pin during a suction operation (e.g. suction of debris) compared to an arrangement in which there is no current collecting plate and/or there is no adequate fastening, seal and/or weld between the current collecting plate and the pin.
According to an embodiment of the disclosure, the pin may comprise an engagement portion, wherein an inner surface of the first engagement portion comprises an engagement profile configured to engage with a torque-applying tool to thereby enable the pin to be rotated about a longitudinal axis of the pin by the torque-applying tool.
According to an embodiment of the disclosure, the pin may comprise a recess on an outer surface of the pin, extending along the length of the pin, configured to receive an edge of the electrode roll assembly.
According to an embodiment of the disclosure, the pin may be hollow and wherein the method comprises attaching the pin to the current collecting plate by laser welding through the pin. The present embodiment is advantageous in that the hollow pin conveniently provides for a laser welding through the pin for attachment of the pin to the current collecting plate.
According to an embodiment of the disclosure, there is provided a cylindrical secondary cell. The cylindrical secondary cell comprises a positive terminal part, a negative terminal part, an electrode roll assembly, and the structure according to any one of the previously described embodiments, wherein the structure comprises two current collecting plates.
Brief description of drawings The above and other aspects of the present invention will now be described in more detail, with reference to the appended figures.
Fig. 1 is a schematic illustration of a cross-section of a cylindrical secondary cell.
Fig. 2 is a schematic illustration of an exploded view of a cylindrical secondary cell.
Figs. 3a-3c and Figs. 4a-4d are schematic illustrations of structures for a cylindrical secondary cell.
Figs. 5a and 5b are schematic illustrations of current collecting plates of a structure for a cylindrical secondary cell.
Fig. 6 is a schematic illustration of a cross-section of a cylindrical secondary cell and an application of a suction device to the cylindrical secondary cell.
Fig. 7 is a schematic illustration of a method of manufacturing a cylindrical secondary cell.
Detailed description
The present invention will now be described hereinafter with reference to the accompanying drawings, in which currently preferred, exemplary embodiments of the invention are illustrated. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those persons skilled in the art.
Fig. 1 is a schematic illustration of a cylindrical secondary cell 1 (also referred to as cell). The cell 1 is exemplified with a cylindrical enclosure 2 with a first enclosure end 2a (the top end in Fig. 1 ) and an opposite second enclosure end 2b (not shown). The cylindrical enclosure 2 may also be referred to as a can. An electrode roll assembly 3 is arranged inside the cylindrical enclosure 2. The first enclosure end 2a may be formed in one piece with the cylindrical enclosure 2 (as illustrated in Fig. 1 ) and the second enclosure end 2b may be formed by a separate second enclosure end lid (not shown), or vice versa. The cell 1 relates to a cell 1 of a type that has both a positive terminal 4 and a negative terminal 5 at one and the same end (the top end in Fig. 1 ) of the cylindrical secondary cell 1 . The first enclosure end 2a comprises a central terminal through-hole 2c for the positive terminal 4. The negative terminal 5 is electrically connected to the cylindrical enclosure 2. More precisely, the negative terminal 5 is formed by the top surface of the cylindrical enclosure 2 that surrounds the terminal through-hole 2c. Thus, the entire cylindrical enclosure 2 (apart from the positive terminal 4 at the top end) may be the negative terminal 5. A cylindrical secondary cell 1 having both terminals 4, 5 at one end may bring advantages as regards electrically connecting the cell 1 to a load. Conductors electrically connecting the terminals 4, 5 to the load may be positioned on the same end, the terminal end, of the cell 1 .
The electrode roll assembly 3 comprises a first and a second conductive sheet 3a, 3b and separating means (not shown). The separating means may also be termed separator. The conductive sheets 3a, 3b and the separating means are rolled to form a circular cylindrical roll defining a central channel 3c. The sheets 3a, 3b are coated with electrode coatings and on assembly of the cell 1 . The coatings on the conductive sheets 3a, 3b act as cathode and anode, respectively. The cathode, anode and electrolyte provide electrochemical energy storage. This principle is known per se, and the electrode roll assembly 3 is commonly referred to as a jellyroll.
The sheets 3a, 3b of the electrode roll assembly 3 are axially offset in relation to one another, and each comprises an end section that is not coated with electrode coating. In Fig. 1 , only one end of the electrode roll assembly 3 is shown, and at this end the first conductive sheet 3a protrudes axially from the electrode roll assembly 3. At the opposite end (not shown) of the electrode roll assembly 3, the second conductive sheet 3b protrudes axially. The second electrode roll 3b is schematically indicated by a dashed arrow in Fig. 1.
Fig. 2 is a schematic illustration of an exploded view of a cylindrical secondary cell 1. The cylindrical secondary cell 1 comprises a cylindrical enclosure 15, which may also be referred to as a can. The cylindrical enclosure 15 encloses the electrode roll assembly 3. The cylindrical secondary cell 1 comprises a structure 2 which in turn comprises current collecting plates 6a, 6b, namely an anode disc 6a and a cathode disc 6b. A pin 7 of the structure 2 is attached to the (first) current collecting plate 6a (anode) and/or to the (second) current collecting plate 6b.
Figs. 3a-3c are schematic illustrations of a structure 2 for a cylindrical secondary cell as exemplified in Fig. 1 , of which Figs. 3a and 3b show an embodiment of the structure 2 from different angles.
In Fig. 3a, the structure 2 comprises a (single) current collecting plate 6a. When assembled in the cell 1 , the current collecting plate 6a of the structure 2 is configured to be arranged in direct electrical contact with the electrode roll assembly 3 of the cell 1 , more precisely with the non-coated end section of the first conductive sheet 3a of the cell 1 . Hence, the current collecting plate 6a is configured to be arranged in direct electrical and direct physical contact with the first conductive sheet 3a of the cell 1 . The structure 2 further comprises a (central) pin 7 which is attached or fastened to the current collecting plate 6a by an end portion 7a of the pin 7. The pin 7 extends perpendicular to the surface of the current collecting plate 6a. The pin 7 is configured to extend through the center of the electrode roll assembly 3 of the cell 1 . In the case of the pin being attached to a (single) current collecting plate as shown in Fig. 3a, the structure 2 may have a “T” profile. The pin 7 provides a conduit through the electrode roll assembly 3 for gas evacuation.
Fig. 3c schematically illustrates an alternative embodiment of the structure 2 as exemplified in Fig. 3a. In Fig. 3c, the structure 2 comprises two current collecting plates 6a, 6b, wherein the pin 7 is attached to a first current collecting plate 6a at a first end portion 7a of the pin 7, and wherein the pin 7 is attached to a second current collecting plate 6b at a second end portion 7b of the pin 7. In the case of the pin 7 being attached to the two current collecting plates 6a, 6b at respective end portions of the pin 7, the structure 2 has a barbell profile.
Figs. 4a-d are schematic illustrations of structures 2 for a cylindrical secondary cell. As the structures 2 shown in Figs. 4a-d have similar and/or same features as in Figs. 3a-c, it is also referred to Figs. 3a-c for an increased understanding. In Fig. 4a, at least a portion of the pin 7 is tapered in a direction from the current collecting plate 6a, i.e. having a smaller diameter in crosssection at least along a portion of the length of the pin 7. In Fig. 4b, a second end portion 7b of the pin 7, which in this case is not attached to any current collecting plate, comprises an electrical insulation material 8. Fig. 4c shows an example of a cross-section of the pin 7. Here, the pin 7 is hollow and the pin 7 has a cylinder shape with an inner (cross) section which is circular and with an outer (cross) section which is circular. Fig. 4d shows another example of a cross-section of the pin 7, wherein the pin 7 is hollow and the pin 7 has an inner (cross) section which is polygonal and with an outer (cross) section which is circular.
Fig. 5a shows the current collecting plate 6a of the structure 2 in more detail. The current collecting plate 6a of Fig. 5a may be used in cylindrical secondary cells and with terminal parts of other design than the ones described herein. The current collecting plate 6a is configured to be arranged in direct electrical contact with a conductive sheet 3a of an electrode roll assembly 3 and in direct electrical contact with a terminal part 4 as previously described. The terminal part 4 may form an external terminal of the cell 1. The current collecting plate 6a of Fig. 5a comprises a first end surface 11 a and an opposite second end surface 11 b. When assembled, the first end surface 11 a faces away from the electrode roll assembly 3 and the second end surface 11 b faces the electrode roll assembly 3. The current collecting plate 6a of Fig. 5a comprises an inner contact region 6c and an outer contact region 6e. The outer contact region comprises a number of electrolyte flow holes 6g, which will be described below. In the present example, the cell 1 is circular cylindrical and the current collecting plate 6a has the general shape of a circular disc. The inner contact region 6c is configured to be arranged in direct electrical contact with the terminal part 4 and the outer contact region 6e is configured to be arranged in direct electrical contact with the first conductive sheet 3a.
Fig. 5b shows another embodiment of a current collecting plate 6a of the structure 2 according to one or more of the previously described examples. Fig. 5b corresponds to the current collecting plate of Fig. 5a but lacks through-holes in the fuse region 6d and lacks electrolyte flow holes 6g. Thus, the current conducting area of the fuse region 6d is decreased solely by an indentation.
Fig. 6 is a schematic illustration of a cross-section of a cylindrical secondary cell 1 . A structure 2, according to one or more of the previously described examples, is arranged in the cylindrical secondary cell 1. The structure 2 comprises a current collecting plate 6a with a through hole 12 at the center of the current collecting plate 6a. A hollow pin 7 is attached to the current collecting plate 6a. The pin 7 extends through the center of the electrode roll assembly 3 of the cylindrical secondary cell 1. The pin 7 provides a conduit through the electrode roll assembly 3 for gas evacuation. The cylindrical secondary cell 1 as exemplified allows for an application of a suction device for suction of debris from the hollow center pin 7. The suction device comprises a funnel-shaped element 13 (e.g. a suction cup) which may be applied to the (flat) current collecting plate 6a, for a suction from the pin 7 via the through hole 12 of the current collecting plate 6a.
Fig. 7 is a schematic illustration of a method of manufacturing a cylindrical secondary cell. The method comprises attaching the pin 7 of the strcuture 2 to the first current collecting plate 6a at a first end portion 7a of the pin 7, whereby the pin 7 extends perpendicular to the surface of the first current collecting plate 6a. The method further comprises arranging the structure 2 such that the pin 7 extends through the center of the electrode roll assembly 3 in the cylindrical secondary cell. The method further comprises attaching the pin 7 to the second current collecting plate 6b at a second end portion (not shown) of the pin 7.

Claims

1. A structure (2) for a cylindrical secondary cell (1 ), the cylindrical secondary cell (1 ) comprising a positive terminal part (4), a negative terminal part (5) and an electrode roll assembly (3), wherein the structure (2) comprises
- a current collecting plate (6a, 6b), configured to be arranged in direct electrical contact with the electrode roll assembly (3), and one of the positive terminal part (4) and the negative terminal part (5), and
- a pin (7) attached to the current collecting plate (6a, 6b) at an end portion (7a, 7b) of the pin (7), whereby the pin (7) extends perpendicular to the surface of the current collecting plate (6a, 6b), wherein the pin (7) is configured to extend through the center of the electrode roll assembly (3) and provide a conduit through the electrode roll assembly (3) for gas evacuation.
2. The structure (2) according to claim 1 , comprising a single current collecting plate (6a), wherein the pin (7) is attached to the single current collecting plate (6a) at a first end portion (7a) of the pin (7).
3. The structure (2) according to claim 2, wherein a second end portion (7a, 7b) of the pin (7) comprises an electrical insulation material (8).
4. The structure (2) according to claim 1 , comprising two current collecting plates (6a, 6b), wherein the pin (7) is attached to a first current collecting plate (6a) at a first end portion (7a) of the pin (7), and wherein the pin (7) is attached to a second current collecting plate (6b) at a second end portion (7b) of the pin (7).
5. The structure (2) according to any preceding claim, wherein at least a portion of the pin (7) is tapered (9) in a direction from the current collecting plate (6a, 6b).
6. The structure (2) according to any preceding claim, wherein the pin (7) has a cylinder shape (10).
7. The structure (2) according to any preceding claim, wherein the pin (7) is hollow.
8. The structure (2) according to claim 7, wherein an inner section of a cross-section of the pin (7) has a polygonal shape (11 ).
9. The structure (2) according to any preceding claim, wherein the pin (7) is attached to the current collecting plate (6a, 6b) by a laser weld.
10. The structure (2) according to any preceding claim, wherein the current collecting plate (6a, 6b) comprises at least one hole (6g).
11 . The structure (2) according to any preceding claim, wherein the current collecting plate (6a, 6b) is disc-shaped.
12. The structure (2) according to any preceding claim, wherein the pin (7) is hollow, and wherein the current collecting plate (6a, 6b) comprises a through hole (12) at the center of the current collecting plate (6a, 6b), for allowing an application of a suction device for a suction from the pin (7) via a funnel-shaped element (13) provided at the through hole (12).
13. The structure (2) according to any preceding claim, wherein the pin comprises an engagement portion, wherein an inner surface of the first engagement portion comprises an engagement profile configured to engage with a torque-applying tool to thereby enable the pin to be rotated about a longitudinal axis of the pin by the torque-applying tool.
14. The structure (2) according to any preceding claim, wherein the pin comprises a recess on an outer surface of the pin, extending along the length of the pin, configured to receive an edge of the electrode roll assembly.
15. A method of manufacturing a structure (2) for a cylindrical secondary cell (1 ), the cylindrical secondary cell (1 ) comprising a positive terminal part (4), a negative terminal part (5) and an electrode roll assembly (3), wherein the method comprises
- attaching a pin (7) to a current collecting plate (6a, 6b) configured to be arranged in direct electrical contact with the electrode roll assembly (3) and one of the positive terminal part (4) and the negative terminal part (5), at an end portion (7a, 7b) of the pin (7), whereby the pin (7) extends perpendicular to the surface of the current collecting plate (6a, 6b), wherein the pin (7) is configured to extend through the center of the electrode roll assembly (3) and provide a conduit through the electrode roll assembly (3) for gas evacuation.
16. The method according to claim 15, wherein the pin (7) is hollow and wherein the method comprises attaching the pin (7) to the current collecting plate (6a, 6b) by laser welding through the pin (7).
17. A cylindrical secondary cell (1 ), comprising a respective terminal part (4, 5), an electrode roll (3) assembly, and the structure (2) according to any one of claims 1 or 4 to 14, wherein the structure (2) comprises two current collecting plates (6a, 6b).
18. A method of manufacturing the cylindrical secondary cell (1 ) of claim 17, wherein the method comprises attaching the pin (7) to a first current collecting plate (6a) at a first end portion (7a) of the pin (7), whereby the pin (7) extends perpendicular to the surface of the first current collecting plate (6a), arranging the structure (2) such that the pin (7) extends through the center of the electrode roll assembly (3), and attaching the pin (7) to a second current collecting plate (6b) at a second end portion (7b) of the pin (7).
PCT/EP2023/051747 2022-01-28 2023-01-25 Structure for a cylindrical secondary cell WO2023144176A1 (en)

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