SE546569C2 - A cylindrical secondary cell lid comprising a vent feature - Google Patents

A cylindrical secondary cell lid comprising a vent feature

Info

Publication number
SE546569C2
SE546569C2 SE2251009A SE2251009A SE546569C2 SE 546569 C2 SE546569 C2 SE 546569C2 SE 2251009 A SE2251009 A SE 2251009A SE 2251009 A SE2251009 A SE 2251009A SE 546569 C2 SE546569 C2 SE 546569C2
Authority
SE
Sweden
Prior art keywords
secondary cell
cylindrical secondary
lid
center portion
cell lid
Prior art date
Application number
SE2251009A
Other languages
Swedish (sv)
Other versions
SE2251009A1 (en
Inventor
Michael Shaughnessy
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
Priority to SE2251009A priority Critical patent/SE546569C2/en
Priority to PCT/EP2023/073521 priority patent/WO2024046974A1/en
Publication of SE2251009A1 publication Critical patent/SE2251009A1/en
Publication of SE546569C2 publication Critical patent/SE546569C2/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
    • 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
    • H01M50/152—Lids or covers characterised by their shape 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)

Abstract

This disclosure presents a cylindrical secondary cell (1) for a cylindrical secondary cell (10), the cylindrical secondary cell lid (1) comprising a groove (2) configured to provide an opening in the cylindrical secondary cell lid (1) if a pressure to which the cylindrical secondary cell lid (1) is subjected reaches a threshold value. The groove (2) comprises a center portion (2c) that at least partially encircles a center of the cylindrical secondary cell lid (1), and a radial portion (2r) that extends from the center portion (2c) towards a circumferential edge of cylindrical secondary cell lid (1).

Description

TECHNICAL FIELD The present disclosure generally pertains to cylindrical secondary cells and more precisely to a lid for such a cell, Where the lid comprises a vent feature.
BACKGROUND In addressing climate change, there is an increasing demand for rechargeable batteries, e.g. to enable electrif1cation of transportation and to supplement reneWable energy. Currently, lithium-ion batteries are becoming increasingly popular. They represent 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 and cost. To achieve an effective production of rechargeable batteries, the design of the batteries as Well as their manufacturing process can be optimized.
Another aspect to consider is that the rechargeable batteries must be safe to use. Therefore, rechargeable batteries have at least one vent for releasing gas When the pressure inside the batteries rises above an allowed level.
A rechargeable battery, often referred to as a secondary battery, typically comprises one or more secondary cells electrically connected to each other.
SUMMARY It is in view of the above considerations and others that the embodiments of the present invention have been made. The present disclosure aims at providing highly reliable secondary cells that are efficient in manufacture. The number of components is to be reduced and the assembly thereof is to be simplif1ed.
According to a one aspect of the present disclosure, a cylindrical secondary cell lid for a cylindrical secondary cell is provided. The cylindrical secondary cell lid comprises a groove or notch conf1gured to provide an opening in the cylindrical secondary cell lid if a pressure to which the cylindrical secondary cell lid is subjected reaches a threshold value, the groove or notch comprising a center portion that at least partially encircles a center of the cylindrical secondary cell lid, and a radial portion that extends from the center portion towards a circumferential edge of cylindrical secondary cell lid. The groove or notch may be referred to as a vent feature.
According to another aspect, there is provided a cylindrical secondary cell comprising an enclosure with an open end and the above described cylindrical secondary cell lid.
According to a further aspect, there is provided a cylindrical secondary cell comprising an end comprising a groove or notch conf1gured to provide an opening in the cylindrical secondary cell end if a pressure inside the cylindrical secondary cell reaches a threshold value, the groove or notch comprising a center portion that at least partially encircles a center of the cylindrical secondary cell end, and a radial portion that extends from the center portion towards a circumferential edge of the cylindrical secondary cell end.
The lid may be conf1gured to be arranged in direct electrical contact with an electrode roll that is arranged inside the cylindrical enclosure. The lid alone may thus provide an electrical contact between the electrode roll and the cylindrical enclosure. The groove or notch may consist of one center portion and two radial portions.
Advantages associated with the present disclosure, and additional conceivable features, will become clear from the following description of embodiments and examples.
BRIEF DESCRIPTION OF THE DRAWINGS The embodiments disclosed herein are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings. Like reference numerals refer to corresponding parts throughout the drawings, in which Figure l shows a cylindrical secondary cell lid, Figure 2 is a schematic cross-section of a cylindrical secondary cell lid with the cylindrical secondary cell lid of figure l, and Figures 3 to 7 disclose alternative embodiments of the cylindrical secondary cell lid DETAILED DESCRIPTION Embodiments of the present disclosure will now be described more fully hereinafter. The invention may, however, be embodied in many different forrns 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.
Figure 2 shows a cylindrical secondary cell 10 (hereinafter referred to as cell) in a cross- sectional side view. In the exemplified embodiment, the cell 10 is circular cylindrical. The cell 10 comprises a cylindrical enclosure 11, and has a first end (or first enclosure end) 10a, an opposite second end (or second enclosure end) l0b and a sidewall (or enclosure sidewall) l0c that extends between the ends 10a, l0b.
In the exemplified embodiment, the first and second ends 10a, l0b are circular. The sidewall l0c is circular cylindrical. The cell 10, and thus its sidewall l0c, may be elongate and extend along a longitudinal axis (Z-axis in figure 1). The ends 10a, l0b may extend in planes (XY- planes in figure 2) that are perpendicular to the longitudinal axis.
As is illustrated, the first end 10a, or first enclosure end side (top side in figure 2), may be formed in one piece with the sidewall l0c. The second end l0b may be open and a separate cylindrical secondary cell lid 1 (hereinafter referred to as lid) may, as shown, be attached to the cylindrical enclosure ll at the open end l0b. Thus, the lid 1 may form the second enclosure end side (bottom side in figure 2). Altematively, both ends sides may be formed by respective lids.
Now, the lid 1 comprises, as is shown in figures 1 and 3 to 7, a groove or notch 2 for providing an opening in the lid 1 if a pressure to which the lid 1 is subjected, i.e. a pressure inside the cell 10, reaches a threshold value. In such a situation, gas and/or other ej ecta may be released out of the cell 10 through the opening formed in the lid 1. The opening formed in the lid 1 as a result of the groove or notch 2 breaking may be referred to as a vent opening. The groove or notch 2, may altematively be referred to as a groove pattem or a notch pattem.
The groove or notch 2 (hereinafter groove) forrns as a breakable portion and may be a thinning (see figure 2) of the lid material that is conf1gured to break before other parts of the lid 1 (and the cylindrical enclosure 11). In the current embodiments, the groove 2 (or groove pattern) is arranged in flat portions of the lid 1, i.e., in portions of the lid that extend in a plane (XY-plane in figures 1 and 2) that is perpendicular to the longitudinal axis of the cell 10. Said plane may be referred to as a first plane pl or groove plane (indicted in figure 2).
The groove 2 comprises a center portion 2c and a radial portion 2r. As is illustrated, the center portion 2c at least partly encircles a center, or midpoint, of the lid 1. As is also illustrated, the radial portion 2r extends from the center portion 2c towards the circumferential edge of lid 1. The radial portion 2r may be straight. The radial portion may extend essentially all the way to the circumferential edge of lid 1. Typically, the radial portion extends from the center portion 2c and ends at a distance from the circumferential edge of lid 1. Said distance may correspond to 1 to 10 percent of the lid radius, or typically 2 to 6 percent of the lid radius.
Should the pressure within the cell 10 increase, the lid 1 is expected to typically first break at the center portion 2c of the groove 2. The center portion 2c may encircle a relatively large area, such that the pressure generates a relatively large force on the center portion 2c. For example, the radius of the center portion may be 30 to 40 percent of the lid radius. Further, the center portion 2c may encircle an area that is positioned immediately adj acent an electrolyte channel or void (not shown) formed through the below-described electrode roll 20. In an axial view, the center portion 2c may at least partially encircle said electrolyte channel or void.
As the radial portion 2r extends from the center portion 2c, the break or rupture that started at the center portion 2c is expected to propagate along the radial portion 2r. The center portion 2c and the radial portion 2r may be conf1gured such that breaking the radial portion 2r may be facilitated or initiated by the center portion 2c breaking. For example, the center portion 2c may be connected to the radial portion 2r. The groove pattem 2 that comprises the center portion 2c and the radial portion 2r may be continuous.
As is illustrated in figure 4, a propagation of the rupture from the center portion 2c to the radial portion 2r may be facilitated by the connection between the center portion 2c and the radial portion 2r being rounded. In other words, there may be an in-plane smooth (or rounded) transition from the center portion 2c to the radial portion 2r.Even though a connection between a center portion 2c and a radial portion 2r is believed beneficial, a rupture may propagate from a center portion 2c to a radial portion 2r also should the portions be adjacent rather than connected. By adjacent is meant that there is a distance between the center portion 2c and the radial portion 2r. Said distance may be small. The distance may for example correspond to approximately 1 to 2 percent of the lid 1 diameter.
Figure 1 illustrates a lid 1 that comprises a circular center portion 2c. In this embodiment, the center portion 2c is a complete circle. Six radial portions 2r extend from the center portion 2c. The radial portions 2r are all connected to the center portion 2c. The radial portions 2r are angularly equidistantly distributed. The angle between each radial portion is thus 60 degrees. The groove pattem 2 of figure 1 essentially resembles a sun emoji. Figure 1 further illustrates six below-described recessed contact portions Figure 3 illustrates an embodiment similar to the one of figure 1 but without recessed contact portions Figure 4 illustrates an embodiment where the groove 2 (or groove pattem) consists of one arc- shaped center portion 2c and two radial portions 2r. The center portion 2c extends around approximately 300 degrees of the 360 degrees lid circumference. In other embodiments, the center portion 2c may extend around for example 200, 240 or 300 degrees.
In figure 4, the center portion 2c comprises a first end 2c1 and a second end 2c2. Thus, these ends 2c1, 2c2 are the ends of the arc-shaped center portion 2c. The first end 2c1 is connected to a first one 2r1 of the two radial portions 2r. The second end 2c2 is connected to a second one 2r2 of the two radial portions 2r. As is shown, the transitions between the respective ends 2c1, 2c2 and the corresponding radial portions 2r1, 2r2 may be rounded.
Figure 5 illustrates an embodiment with an arc-shaped center portion 2c and three radial portions 2r. One end 2c1 of the center portion is adj acent to a first radial portion 2r1. The other end of the center portion 2c is connected to a second radial portion. Essentially mid-way between the ends of the center portion 2c, the third radial portion is connected.
Figure 6 illustrates an embodiment equal to the one of figure 3, but where the center portion 2c is arc-shaped rather than a complete circle. The ends of the center portion 2c are continuous with a respective radial portion (as is the case in figure 4). The respective connections between the ends of the center portion 2c and the radial portions 2r may be rounded (see figure 4).
Figure 7 illustrates an embodiment where the groove 2 consists of one arc-shaped, or more precisely C-shaped, center portion 2c and three radial portion 2r. The center portion 2c extends around approximately 240 degrees of the lid circumference. The ends of the center portion 2c are continuous with a respective radial portion (the transition may be rounded, see figure 4). Circumferentially mid-way between the ends of the center portion 2c, the third radial portion is connected.
During assembly, the lid 1 may for example be held or clamped towards the inner surface of the cylindrical enclosure ll and simultaneously be secured thereto by welding, typically laser welding. In other embodiments (not illustrated), the lid 1 may be attached radially extemally to the cylindrical enclosure 11 at the open end 10b. The lid 1 may, as is shown, comprise a flange to facilitate attachment to the cylindrical enclosure 1 1. There lid need not be welded to the cylindrical enclosure, the attachment between the lid and the enclosure is not a focus of the present disclosure.
Figure 2 illustrates a cell 10 of a type that has both a positive terminal and a negative terminal at one and the same end 10a (the top end in figure 2) of the cell 10. The first end 10a comprises a central terminal through-hole for the positive terminal. The negative terminal is electrically connected to the cylindrical enclosure 11. More precisely, the negative terminal is formed by the top surface of the cylindrical enclosure 11 that surrounds the terminal through-hole. Thus, the entire cylindrical enclosure 11 (apart from the positive terminal at the top end) may be the negative terminal. The lid 1 of the present disclosure may for example be used in the cell 10 of figure A cell 10 having both terrninals at one end may bring advantages as regards electrically connecting the cell to a load. Conductors electrically connecting the terrninals to the load may be positioned on the same end, the terminal end (top side in figure 2), of the cell. The opposite end, which may be referred to as the electrolyte-filling end (bottom end in figure 2), of the cell 10 may be dedicated to electrolyte f1lling and venting. An overpressure may be generated within the cell during operation, in particular upon malfunction of the cell or of the load connected to the cell. Such malfunction may require a release of gas and/or other ej ecta out ofthe cell, and it may be advantageous to direct the released gas and/or other ej ecta away from the conductors, i.e. at the end opposite to the terminal end.
A number of cells l0 may be positioned at a low position in an electric vehicle. The cells l0 may be arranged with the terminal ends directed upwards and the electrolyte-filling ends l0b (bottom end in figure 2) directed downwards. Upon malfunction, for example resulting from a faulty electric vehicle charger or a faulty cell l0, a release of gas and/or other ej ecta from the electrolyte-filling end(s) will be advantageously directed downwards towards the ground beneath the vehicle. In other applications than vehicles, the electrolyte-filling ends may be directed towards a desired location such that any gas and/or other ej ecta will not cause damages or injuries.
As is illustrated in figure 2, the cell l0 may comprise an electrode roll 20. The electrode roll 20 comprises a first and a second conductive sheet 2l, 22 and separating means (not shown). The separating means may also be terrned separator. The conductive sheets 2l, 22 and the separating means are rolled to form a circular cylindrical roll. The conductive sheets 2l, 22 are coated with electrode coatings and on assembly of the cell l0, the cylindrical enclosure ll is filled with an electrolyte. The coatings on the conductive sheets 2l, 22 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 20 is commonly referred to as a j ellyroll.
The conductive sheets 2l, 22 of the electrode roll 20 may be axially offset in relation to one another, and each conductive sheet may comprise an end section that is not coated with electrode coating. Via the non-coated end sections, the respective ends of the electrode roll may be efficiently electrically connected to a respective assigned terminal of the cell l0. This design is known per se and commonly referred to as a tabless cell.
As is illustrated in figure 2, one 22 of the conductive sheets may be in electrical contact, more precisely in direct electrical contact, with the lid l. Direct electrical contact may be referred to as physical contact.
As is clear from figures l, 2 and 7, the lid l may be configured to be arranged in direct electrical contact with the conductive sheet 22. Typically, the lid l is welded, e.g. laser welded, to theconductive sheet 22. Thus, no additional separate component needs to be arranged to make contact with the conductive sheet As is shown (figures 1, 2 and 7), the lid 1 may comprise at least one recessed contact portion 3 that is configured to forrn the direct electrical contact with the conductive sheet 22. Typically, the above-mentioned weld attaching the lid 1 to the conductive sheet 22 is arranged within the at least one recessed contact portion The lid 1 may comprise a filling opening (not shown) for the above-described electrolyte filling. The filling opening may be arranged in a recessed filling portion 4, illustrated in figure 2. The recessed filling portion 4 may be arranged in, more precisely axially extend or protrude to, the same plane as the recessed contact portion 3. Said plane may be referred to as a second plane p2 or contact plane (indicted in figure 2).The filling opening may be sealed by a sealing element (not shown) such as for example a rivet, such as a blind rivet. If the filling portion 4 is recessed, the sealing element may be countersunk such that it does not protrude beyond the lid The lid 1 may be generally disc-shaped. The lid 1 may have the general shape of a circular plate. In some more detail, the lid 1 may comprise a circular disc that at the radially outer end comprises the above-described optional flange. The flange may extend from the circular disc in a direction away from the cylindrical enclosure 11 (when the lid 1 is attached to the cylindrical enclosure 11). The flange may however altematively extend in a direction towards the cylindrical enclosure. The circular disc and the flange may be formed in one integral piece.
The recessed contact portion 3 or portions (figure 1 discloses six recessed contact portions 3 and figure 7 indicated one recessed contact portion 3) may be formed in the circular disc. The recessed contact portions 3 may be equidistantly distributed along the circumference of the lid 1. Each one of the recessed contact portions 3 may be of the same size. The recessed contact portions 3 may have essentially the same extension radially and circumferentially to facilitate welding. In other words, the recessed contact portions may have similar extensions in all direction as seen in the plane (XY-plane in figures 1 and 2) of the lid 1. The smallest extension of the recessed contact portions 3 may be at least 20 percent of the total extension of the lid.
As is illustrated in particular in figure 1, the recessed contact portions 3 may be arranged between the radial portions 2r. This may altematively be expressed as the radial portions 2r being arranged between the recessed contact portions The recessed contact portions 3 may, as is shown in figure 2, axially extend or protrude from the first plane pl to the second plane p2. The axial position (contact plane p2) at which the recessed contact portions 3 electrically contact the electrode roll 20 may thus be axially distanced from the axial position of the groove 2 (groove plane pl). Such a design may be beneficial for rupturing the groove In figure 2, the material thickness of the cell 10 and the lid 1 has been exaggerated. Figure 2 further illustrates a certain (radial) gap between the cylindrical enclosure 11 and the lid 1. It is to be apprehended that in actual implementations the lid is in direct contact with the cylindrical enclosure before attachment e.g. by welding. Also, during assembly the lid 1 is brought in direct contact with the electrode roll 20, the illustrated (axial) gap between the lid 1 and the electrode roll 20 will thus be closed.
Modifications and other variants of the described embodiments will come to mind to ones skilled in the art having benefit of the teachings presented in the foregoing description and associated drawings. Therefore, it is to be understood that the embodiments are not limited to the specific example embodiments described in this disclosure and that modifications and other variants are intended to be included within the scope of this disclosure. For example, a cylindrical secondary cell lid, or a cylindrical secondary cell end, may be provided with the groove or notch described herein without the lid or end comprising the other features of the lid described herein. Such as the recessed contact portions regions or the filling opening.
Furthermore, although specific terms may be employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation. Therefore, persons skilled in the art would recognize numerous variations to the described embodiments that would still fall within the scope of the appended claims. As used herein, the terms "comprise/comprises" or "include/includes" do not exclude the presence of other elements or steps. Furthermore, although individual features may be included in different claims (or embodiments), these may possibly advantageously be combined, and the inclusion of different claims (or embodiments) does not imply that a certain combination of features is not feasible and/or advantageous. Inaddition, singular references do not exclude a plurality. Finally, reference nunierals in the clainis are provided n1erely as a clarifying example and should not be construed as liniiting the scope of the clainis in any Way.

Claims (15)

1. A cylindrical secondary cell lid (1) for a cylindrical secondary cell (10), the cylindrical secondary cell lid (1) coniprising a groove (2) configured to provide an opening in the cylindrical secondary cell lid (1) if a pressure to Which the cylindrical secondary cell lid (1) is subjected reaches a threshold value, groove (2) coniprisjçsâïssgï - a center portion (2c) that at least partially encircles a center of the cylindrical secondary cell lid (1), and - a radial portion (2r) that extends from the center portion (2c) towards a circuniferential edge of ;i__š'j~,g;__cylindrical secondary cell lid (1). The cylindrical secondary cell lid (1) of clain1 1, Wherein the center portion (2c) and the radial portion (2r) are configured such that breaking the radial portion (2r) n1ay be facilitated or initiated by the center portion (2c) breaking. The cylindrical secondary cell lid (1) of any preceding clain1, Wherein the center portion (2c) is arc-shaped or essentially C-shaped. The cylindrical secondary cell lid (1) of any preceding clain1, Wherein the center portion (2c) is circular. The cylindrical secondary cell lid (1) of any preceding clain1, Wherein a first end (2c1) of the center portion (2c) is connected to, or adj acent to, the radial portion (2r). The cylindrical secondary cell lid (1) of clain1 5, Wherein a second end (2c2) of the center portion (2c) is connected to, or adj acent to, another radial portion (2r). The cylindrical secondary cell lid (1) of any preceding clain1, Wherein a first end (2c1) of the center portion (2c) is connected to a first radial portion (2r1) and a second end (2c2) of the center portion (2c) is connected to a second radial portion (2r2). The cylindrical secondary cell lid (1) of any preceding claim, wherein a connection between the center portion (2c; 2c1; 2c2) and a radial portion (2r; 2r1; 2r2) is rounded. The cylindrical secondary cell lid (1) of any preceding claim, wherein the radial portion (2r) is essentially straight. The cylindrical secondary cell lid (1) of any preceding claim, wherein the number of radial portions (2r) is two, three or six. The cylindrical secondary cell lid (1) of any preceding claim configured to be arranged in direct electrical contact with an electrode roll (20) arranged within the cylindrical secondary cell (10). The cylindrical secondary cell lid (1) of any preceding claim comprising number of recessed contact portions (3) configured to be arranged in direct electrical contact with an electrode roll (20) arranged within the cylindrical secondary cell (10). The cylindrical secondary cell lid (1) of claim 11, wherein a recessed contact portion (3) is arranged between two radial portions (2r). A cylindrical secondary cell (10) comprising an enclosure with an open end (10b) and a cylindrical secondary cell lid (1) of any preceding claim. A cylindrical secondary cell (10) comprising an end (10a, 10b) comprising a groove (2) conf1gured to provide an opening in the cylindrical secondary cell end (10a, 10b) if a pressure inside the cylindrical secondary cell (10) reaches a threshold value, groove (2) comprisgïsirag - a center portion (2c) that at least partially encircles a center of the cylindrical secondary cell end (10a, 10b), and - a radial portion (2r) that extends from the center portion (2c) towards a circumferential edge of the cylindrical secondary cell end (10a, 10b).
SE2251009A 2022-08-31 2022-08-31 A cylindrical secondary cell lid comprising a vent feature SE546569C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE2251009A SE546569C2 (en) 2022-08-31 2022-08-31 A cylindrical secondary cell lid comprising a vent feature
PCT/EP2023/073521 WO2024046974A1 (en) 2022-08-31 2023-08-28 A cylindrical secondary cell lid comprising a vent feature

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2251009A SE546569C2 (en) 2022-08-31 2022-08-31 A cylindrical secondary cell lid comprising a vent feature

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SE2251009A1 SE2251009A1 (en) 2023-09-18
SE546569C2 true SE546569C2 (en) 2024-12-03

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