A button battery

Abstract

A button battery according to the present invention comprises a first component (1) in the form of a cup-shaped container, an electrode assembly (4) inserted into the container, and a second component (10) in the form of a lead fixed along its outer edge to the upper rim of a side wall (3) of the container. The first or second component comprises three parts: an electrically conductive central part (11), an electrically conductive peripheral part (12), and an electrically insulating intermediate part (13) that separates and insulates the central part from the peripheral part. The side wall (3) of the first component and the edge of the second component (10) are shaped to include complementary conical parts (22, 25) that come into contact with each other in the assembled battery. The complementary conical parts enable self-alignment of the lead (10) with respect to the rim of the side wall (3) during the assembly of the battery and further support holding the lead on the container during a sealing process, which may be a process of welding the lead to the container along a common peripheral part. According to a preferred embodiment, the edge of the lead (10) and the rim of the side wall (3) are additionally provided with stepped portions (23, 25) configured to define a stop portion for inserting one conical portion into another conical portion.

Description

Technology Field

[0001] The present invention relates to button batteries, which are well known as power sources for small electric-driven devices such as watches and thermometers. Background Technology

[0002] Button batteries, also known as button cells, are widely used and available in multiple types distinguished by various dimensions and shapes, as well as the materials used for the electrodes and electrolytes.

[0003] Most known types of button batteries include a flat base portion serving as a positive contact, a metal bottom cup having upright side walls extending upward from the flat portion, and a metal top lid cup. The flat base portion of the lid cup serves as a negative contact. The battery further includes an electrode assembly in the space between the top cup and the bottom cup. For example, in a rechargeable lithium-ion button battery, the electrode assembly may be a spiral-shaped assembly obtained by rolling up a stack of electrode layers separated by separator sheets impregnated with a liquid electrolyte. Other electrode assemblies are formed as a horizontal stack of alternately stacked electrode and separator layers oriented parallel to the top and bottom contacts. The button cell is often shaped as a round disc, but other shapes are also possible.

[0004] The manufacturing process of the battery type described above includes the process of arranging an electrode assembly within an upper lid cup and inserting the lid cup into a bottom cup, and an electrically insulating sealing member of the gasket or glue type is present between them to seal the electrode assembly from the outside of the battery. If a physical gasket is used, the open end of the wall of the lid cup is inserted into the gasket, and the bottom cup is crimped over the gasket. If a glue-type insulating seal is used, the outer surface of the side wall of the upper lid cup is coated with a sealing material, and then the upper lid cup is inserted into the bottom cup. The glue dries or cures to thus seal the battery.

[0005] These known methods of sealing batteries have several disadvantages. One problem is the double-wall configuration required, for example, to accommodate a gasket or glue, whereby the side walls of the top lid cup and the bottom cup must overlap each other. This results in wasted space occupied by the insulating seal as a physical gasket or sealing glue.

[0006] A solution to this problem was found in the form of an improved battery design that does not have a double-wall configuration. This type of battery is the subject of European patent application EP22178203. The battery still includes a bottom cup that accommodates an electrode assembly and still acts as a positive contact. The battery further includes a lead formed of three parts: an electrically conductive central part, an electrically conductive peripheral part, and an electrically insulating middle part that separates and insulates the central part from the peripheral part. The central part acts as a negative contact, and the insulating part provides electrical insulation. The lead is fixed to the open end of the cup, thereby sealing the battery from the outside. The fixed connection of the lead to the cup is electrically conductive, so that the base of the cup forms the positive contact of the battery. The problem to be solved

[0007] The problem arising in the manufacturing process of this type of battery relates to the process of securing the lead to the cup, which can be accomplished by aligning the lead to the rim of the side wall of the cup and welding the lead to the rim along the aligned periphery (e.g., laser welding). However, obtaining a perfect sealing welded connection requires that the dimensions of the lead and the cup be matched with high accuracy. Furthermore, due to the small dimensions of this type of battery, it is difficult to maintain the lead in the correct position during the welding process. These problems can lead to incomplete welding and potentially pose a risk of chemical leakage from the inside of the battery. means of solving the problem

[0008] The present invention aims to provide a solution to the aforementioned problems. This objective is achieved by a button battery according to the appended claims and a method for assembling such a battery. A button battery according to the present invention comprises a first component in the form of a cup-shaped container, an electrode assembly inserted into the container, and a second component in the form of a lead fixed along its outer edge to the upper rim of an upright side wall of the container. The first or second component comprises three parts: an electrically conductive central part, an electrically conductive peripheral part, and an electrically insulating intermediate part that separates and insulates the central part from the peripheral part. The other component is uniformly formed of an electrically conductive material. The electrodes of the electrode assembly are electrically connected to the components in such a manner that the central electrically conductive part included in one component forms one contact of the battery and the other component forms another contact of the battery.

[0009] In a battery according to the present invention, the side wall of a cup-shaped container and the edge of a second component in the shape of a lid are shaped to include complementary conical portions that come into mutual contact in the assembled battery. The complementary conical portions enable self-alignment of the lid with respect to the rim of the side wall during assembly of the battery, and these conical portions also support holding the lid on the container during a sealing process, which may be a process of welding the lid to the container along the common periphery of the rim of the side wall and the edge of the lid. According to a preferred embodiment, the edge of the lid and the rim of the side wall are further provided with a stepped portion configured to define a stop for inserting one conical portion into another conical portion. Brief explanation of the drawing

[0010] FIG. 1 illustrates a main component of a battery according to prior patent application EP22178203, comprising a rolled-up electrode assembly. Figure 2 illustrates the battery of Figure 1 in an assembled state. Figure 3 shows a cross-sectional view of the battery cup and lead of Figures 1 and 2 before the sealing process. FIGS. 4a and 4b illustrate typical profiles of the edge of the lead and the rim of the side wall in the battery of FIGS. 1 to 3. FIGS. 5A and 5B illustrate matching profiles of the edge of the lead and the rim of the side wall in a battery according to one embodiment of the present invention. FIGS. 6a and 6b illustrate an embodiment having a rim and edge profile similar to that in the previous image, but including an additional stepped portion on the rim of the side wall. However, Fig. 7 illustrates the same rim and edge profile as Fig. 5, having smaller side walls in the battery. FIGS. 8a and 8b illustrate an embodiment in which the conical portions of the rim and edge profiles are inverted with respect to the embodiments of FIGS. 5 through 7. FIGS. 9A and 9B illustrate embodiments in which the lead itself or the side wall includes a truncated part. FIGS. 10a and FIGS. 10b illustrate an embodiment of the present invention in which a cup-shaped component includes a central and peripheral conductive portion separated by an insulating portion, and a lead-shaped component is uniformly formed of a conductive material. FIGS. 11a to 11c illustrate the assembly sequence of lead and cup-shaped components according to an embodiment of the present invention, using friction welding as a method for creating a sealing connection between the components. FIGS. 12a to 12c and FIGS. 13a to 13c illustrate additional examples of a battery according to the present invention, wherein the components are connected by friction welding. Specific details for implementing the invention

[0011] FIG. 1 illustrates the components of a rechargeable lithium-ion battery according to patent application EP22178203. The battery comprises an electrically conductive cup-shaped bottom container (1), preferably formed of metal, having a round base (2) and upright side walls (3) along the circumference of the base (2). Additionally, a winding-up electrode assembly (4) is included, comprising a positive electrode (5), a negative electrode (6), and separator sheets (7) between the wound electrodes, and further comprising current collector strips (8). The image of the electrode assembly (4) is a simplified representation, and the assembly (4) may be realized according to any known design. In the drawing, only the negative collector strip (8) coupled to the negative electrode (6) is visible. On the lower side of the electrode assembly (4), a positive current collector strip coupled to the positive electrode (5) is present. The collector strip (8) is illustrated in a simplified manner as a straight rectangular strip, but it may have a different shape. As is known to those skilled in the art, the collector strip (8) is preferably flexible so that the ends of the strip can be welded to each battery contact.

[0012] The battery comprises a lead (10) comprising three parts: an electrically conductive central part (11), an electrically conductive peripheral part (12), and an electrically insulating intermediate part (13) that separates the central part (11) and the peripheral part (12) from each other and electrically insulates them. The three parts (11 to 13) form a single object, namely, the intermediate part (13) is coupled to the conductive parts (11 and 12) along their respective inner and outer edges. In the embodiment illustrated in FIG. 1, all three parts (11, 12 and 13) of the lead (10) have the same thickness. According to alternative embodiments, the thicknesses of the parts may differ.

[0013] The material used for parts (11, 12 and 13) is mechanically strong and chemically stable with respect to the internal material of the battery. The conductive parts (11 and 12) may be formed of the same material as the bottom container (1), preferably metal. Suitable metals include nickel, cobalt, and certain types of stainless steel, e.g., SS 304 and SS 316. The material of the insulating part (13) may also be hermetically bonded onto the material used for parts (11 and 12). The insulating part (13) may be formed of glass, certain types of rubber, or PTFE (polytetrafluoroethylene) and any derivatives thereof. The lead (10) may be manufactured through a widely known process for bonding different materials.

[0014] An assembly of a battery according to the illustrated embodiment comprises welding a positive current collector strip to the inner surface of the base (2) of a cup-shaped bottom container (1) and inserting an electrode assembly (4) into the container. A liquid electrolyte is injected into the container (1), and a negative current collector strip (8) is welded to the central portion (11) of a lead (10). Then, the lead (10) is placed on the side wall (3) of the cup-shaped container (1) and bonded along its outer edge by a bonding technique that realizes a sealing connection between the lead (10) and the container (1), thereby producing the finished battery illustrated in FIG. 2. The sealing connection can be realized by welding, for example, laser welding.

[0015] The battery has a positive contact formed by the base (2) of a cup-shaped container (1) and a negative contact formed by the central part (11) of the lead (10). The contacts are electrically insulated from each other by the middle part (13) of the lead (10). The sealing connection of the edge of the lead to the rim of the upright wall (3) is electrically conductive and seals the interior of the battery (20) from the environment.

[0016] FIG. 3 illustrates a cross-sectional view of a cup (1) in which the lead (10) is aligned with the rim (20) of the side wall (3) prior to the realization of the sealing connection. The electrode assembly is not illustrated in this image. The side wall (3) may have a rectangular profile, as exemplified in the enlarged view shown in FIG. 4a, that is, the rim (20) is essentially perpendicular to the sides of the side wall (3). Alternatively, the rim (20) may be slightly convex, as exemplified by the dashed line in FIG. 4a. The latter profile typically occurs when the cup is created by a deep drawing process. In the illustrated example, the lead (10) and the side wall (3) have the same thickness, but there may be a slight difference in thickness between the two. In most batteries, this thickness is about tens of millimeters. For example, the thickness of the side wall (3) may be 0.1 mm to 0.3 mm, and the thickness of the lead (10) is 0.1 mm to 0.5 mm. According to a preferred embodiment, the thickness of the side wall (3) is 0.15 mm, and the thickness of the lead (10) is 0.2 mm.

[0017] Lead diameter (D L ) is the outer diameter (D) of the side wall (3). W1 It is configured to match (i.e., as closely as possible to) the outer diameter (D). The lead (10) is configured to match the outer diameter (D). W1 The assembly is aligned with and placed on the rim (20), and then undergoes a welding process, such as laser welding as illustrated in FIG. 4b, to create a welded connection (21) along the aligned periphery of the rim (20) and the lead (10). The welded connection (21) is symbolically represented as a black half-circle in the illustrated image, but in reality, it may have different shapes and sizes depending on the curvature of the rim (20), for example, in the case of a convex rim.

[0018] As mentioned in the introduction, the alignment as well as the matching of the diameters of the lead (10) and the side wall (3) must be extremely accurate so that the welding process is effective in sealing the interior of the battery. Additionally, displacement of the lead (10) during the welding process may cause additional difficulties in terms of obtaining an effective seal.

[0019] According to the present invention, the rim of the side wall (3) and the edge of the lead (10) are shaped to reduce not only displacement-induced errors but also alignment difficulty, thereby improving the quality of the sealing connection. FIGS. 5a and 5b illustrate an embodiment of the present invention. It can be seen that the rim (20') of the side wall (3) is provided with a conical portion (22) and a stepped portion (23). The stepped portion (23) is the outer diameter (D) of the rim (20'). W1 ) and intermediate diameter (D i It extends between ). The conical portion (22) is the middle diameter (D) of the rim (20'). i ) and inner diameter (D W2 It extends between. The edge of the lead (10) is shaped in a corresponding manner and includes a stepped portion (24) along its outer diameter and a conical portion (25) radially inward from the stepped portion (24). The conical portions (22 and 25) are complementary, that is, they have the same angle of inclination so that the outer conical portion of the lead (10) fits into the inner conical portion of the rim (20').

[0020] Now, assembling the lead (10) into the cup (1) involves inserting the conical portion (25) of the lead (10) into the conical portion (22) of the cup until the stepped portion (24) of the lead comes to rest on the stepped portion (23) of the cup. Thus, at this point, both the conical portion (22 and 25) and the stepped portion (23 and 24) are in contact with each other. After this, a welded connection (21) is formed along the aligned periphery of the stepped portion (23 and 24), as illustrated in FIG. 5B.

[0021] Thereby, this enables improved alignment of the lead (10) with respect to the rim (20') of the side wall (3) due to the self-aligning characteristics of the complementary conical parts (22 and 25). Inserting one conical part into the other also realizes a mechanically stable preliminary connection between the lead (10) and the side wall (3), so that alignment is maintained more easily during the welding process. The diameter (D) of the lead (10). L ) preferably the outer diameter (D) of the side wall (3) with the same accuracy as in the design of FIGS. 1 to 4. W1 Although it still matches ), considering that accurate alignment is guaranteed at this time, a slightly larger mismatch between these diameters may be acceptable without reducing the quality of the welded joint.

[0022] However, according to another embodiment, the diameter (D) of the lead (10) L ) is intentionally made smaller than the outer diameter of the side wall (3) as exemplified in FIG. 6a and 6b. Here, the rim (20') includes an additional stepped portion (26) radially outward from the first stepped portion (23). The additional stepped portion (26) is the diameter (D) of the lead (10). L Having an inner diameter that matches the (), the height of the stepped portion (24) of the lead is essentially the same as the height of the additional stepped portion (26), so that the lead (10) is essentially at the same level as the additional stepped portion (26) in the assembled battery, as shown in FIG. 6b. Self-alignment is ensured in the same manner as described above by the respective conical portions (22 and 25) and stepped portions (23 and 24). However, in this case, the welded connection (21) is manufactured from the top rather than from the side along the periphery of the lead (10). This may be more practical in some cases.

[0023] FIG. 7 illustrates an embodiment in which the thickness of the upright wall (3) is smaller than the thickness of the lead (10). In all embodiments described so far, as shown in FIG. 5b, the angle of inclination (α) of the complementary conical portion is about 30°. However, this angle can be selected differently, for example, as a function of the thickness of the side wall (3). For example, when the side wall (3) is significantly thicker than the thickness shown in the examples, it may be desirable to make the angle of inclination (α) larger.

[0024] FIGS. 8A and 8B illustrate an embodiment in which the orientation of the inclination angle of the conical portions (22 and 25) is reversed compared to the previously described embodiment. The rim (20') of the side wall (3) includes an outer conical portion, whereas the lead (10) includes an inner conical portion that fits onto the outer conical portion of the rim (20'). Step portions (23 and 24) are also present and perform the same function as those described above.

[0025] The present invention is not limited to embodiments in which the lead (10) and the side wall (3) are perpendicular to each other. FIGS. 9a and FIGS. 9b illustrate embodiments in which a truncated part (30) that narrows toward the top of the battery is provided on the lead (10) and the upright wall (3), respectively. It can be seen that the conical part and the stepped part as described above are also present on the rim of the upright wall (3) and on the edge of the lead (10) in these embodiments.

[0026] Additionally, the present invention is not limited to an embodiment in which the lead (10) comprises central and peripheral electrically conductive portions (11 and 12) separated by an insulating portion (13). According to an alternative embodiment, the cup-shaped container (1) comprises these portions (11, 12 and 13), and the lead (10) is uniformly formed of an electrically conductive material. Examples of such embodiments are illustrated in FIG. 10a and FIG. 10b. It can be seen that the base (2) of the cup-shaped container (1) comprises the portions (11, 12 and 13). Thus, in a more general sense, and as reflected by the language of the appended claims, the battery according to the present invention comprises a first component (1) formed as a cup-shaped container and a second lead-shaped component (10), either of which may comprise the portions (11, 12 and 13).

[0027] In the embodiments illustrated in FIG. 10a and FIG. 10b, all variations of the present invention are applicable in terms of the matching profile of the rim (20') of the side wall (3) and the edge of the lead (10).

[0028] It is preferable to include stepped portions (23 and 24) on the edges of the rim (20') of the upright wall (3) and the lead (10), but the present invention includes an embodiment in which the stepped portions are omitted, that is, the lead (10) and the rim (20') alone can realize self-aligning characteristics and a preliminary connection, and only complementary conical portions are provided. Then, care should be taken that the insertion of one conical portion into another conical portion is stopped at the exact relative position of the conical portions, thereby enabling the creation of a connection that effectively seals the interior of the battery.

[0029] According to other embodiments, only one component is provided with a stepped portion before the components are joined, whereas other components are not. These embodiments may be applied, for example, when the components are joined by friction welding. FIGS. 11a through 11c illustrate embodiments similar to the embodiments of FIGS. 8a and 8b. The rim of the side wall (3) includes a conical portion (22) and a stepped portion (23) as in FIG. 8a, but the edge of the lead (10) includes only the conical portion (25) including a sharp end (35) and does not include a stepped portion configured to contact the stepped portion (23) of the wall (3). When the lead (10) is positioned on the side wall (3), the sharp end (35) contacts the stepped portion (23), as shown in FIG. 11b. Likewise, the sharp upper end (36) of the conical portion (22) of the side wall (3) comes into contact with the inner surface of the lead (10). Under the conditions illustrated in FIG. 11b, the components undergo friction welding, for example, with an ultrasonic welding tool. In the contact area of ​​the sharp ends (35 and 36), at least one of the materials of the side wall (3) and the lead (10) reaches a temperature higher than the melting temperature, and thus the material locally melts to form a welded connection. FIG. 11c illustrates the joined components after the welding step. Due to the local melting of the materials, the lead (10) descends slightly relative to the side wall (3) to a point where the side of the lead (10) and the side wall (3) are essentially in the same plane (flush). This embodiment is an example of the fact that the components can be connected by more than one welded connection (21). This embodiment also illustrates that in the finished battery, the step portion (23) may no longer be identifiable as it is enclosed by the lower welded connection (21).In an embodiment such as that shown in FIG. 5a and 5b, if the welded area (21) extends beyond the width of the stepped portions (23 and 24), it may be possible for the stepped portions (23 and 24) to no longer be identifiable in the finished battery.

[0030] Another embodiment related to friction welding is illustrated in FIGS. 12a to 12c and FIGS. 13a to 13c. As illustrated in FIG. 12a, both the side wall (3) and the edge of the lead (10) are provided with corresponding stepped portions (23 and 24) and equally corresponding conical portions (22 and 25) as in FIGS. 8a and 8b, but the conical portion (22) of the side wall (3) is longer so that when the lead (10) is positioned on the side wall (3) (as illustrated in FIG. 12b), the sharp end (36) of the side wall (3) contacts the inner surface of the lead (10) before the stepped portions (23 and 24) can begin to make contact with each other. This assembly is then friction-welded to produce the combined assembly shown in FIG. 12c. The welded joint (21) is formed by local melting around the sharp end (36), which causes the lead (10) to descend until it is stopped by mutual contact of the stepped portions (23 and 24). Thus, in this case, the stepped portions fulfill their function of defining the lead position during the welding step rather than before the welding step.

[0031] FIGS. 13a through 13c illustrate similar embodiments, but in which the side wall (3) includes an additional stepped portion (37) radially inward of the conical portion (22). As shown in FIG. 13b, the sharp end (35) of the conical portion (25) of the lead contacts the stepped portion (23) before the second stepped portion (37) contacts the inner surface of the lead (10). After friction welding, the stepped portion (37) and the inner surface come into contact with each other, while the welded connection (21) is formed along the circumference of the assembly.

[0032] In the embodiment described above, the stepped portions (23, 24 and 26) are depicted as having a straight top surface that is essentially parallel to the base (2) of the cup (1). These stepped portions, however, may be slightly rounded, for example, when the rim (20') is formed by shaping a convex rim as illustrated in FIG. 4a with a dotted line. The shaping of the edge of the lid (10) and the rim (20') of the side wall (3) can be performed by standard machining techniques.

[0033] The battery according to the present invention is not limited to a round shape and may have any other shape, for example, a rectangular or a square.

[0034] In some of the embodiments described above, the bottom contact portion is referred to as the positive contact portion and the top contact portion is referred to as the negative contact portion. However, the invention is not limited to such configurations, and thus references to 'first and second' contact portions are made in the appended claims.

[0035] Generally, the method of the present invention for assembling a battery according to any embodiment of the present invention comprises the following steps with reference to any one of the embodiments illustrated in the drawings:

[0036] - A step of aligning the edge of the second component (10) to the rim (20') of the side wall (3) of the first component (1),

[0037] - A step of inserting the conical portion (25) of the edge of the second component (10) into the conical portion (22) of the rim (20') of the side wall (3) or vice versa, so that the conical portions (22, 25) come into contact with each other (i.e., a step of inserting the conical portion (22) of the rim (20') into the conical portion (25) of the lead (10) as in FIG. 8a and FIG. 8b),

[0038] - A step of securing the edge of the second component (10) to the rim (20') of the side wall (3) by means of a sealing connection.

[0039] The steps of 'alignment' and 'insertion' involve the relative movement of the components; for example, alignment can be performed by actively moving the lead relative to the stationary container or by moving the container relative to the stationary lead. Insertion can be performed by actively inserting the positive cone into the stationary negative cone or by placing the negative cone on the stationary positive cone.

[0040] If stepped portions (23 and 24) are provided on both components, the relative insertion of the conical portions may end when these stepped portions come into contact with each other. Then, the fixing step is performed by forming a welded connection along the periphery of the stepped portions, for example, as illustrated in FIGS. 5a and 5b. According to another embodiment including friction welding, for example, illustrated in FIGS. 12a through 12c, the stepped portions begin to come into contact with each other only during the fixing step.

[0041] The method of the present invention is not limited to embodiments in which the final step of fixing the components is performed by laser welding or friction welding. Other types of welding, such as arc welding, may also be applied. In addition to welding, other bonding techniques, such as gluing or applying a polymer-based adhesive and then curing it, may be applied. Which technique is most suitable may depend on the shape of the profiles of the bonded components.

[0042] Although the present invention has been illustrated and described in detail in the drawings and the foregoing description, such illustrations and descriptions should be considered exemplary or typical rather than limiting. Other variations of the disclosed embodiments may be understood and practiced by those skilled in the art of the art from studying the drawings, the disclosure, and the appended claims. In the claims, the word “comprising” does not exclude other elements or steps, and the singular form does not exclude the plural. The mere fact that any measures are cited in mutually different dependent claims does not indicate that a combination of these measures cannot be advantageous. Any reference numerals in the claims should not be interpreted as limiting the scope.

Claims

Claim 1 As a button battery, - a first component (1) in the form of a cup-shaped container having a base (2) and a side wall (3) along the outer circumference of the base, wherein the interior of the container comprises an electrode assembly (4) comprising at least one first electrode (5), one or more separator sheets (7) and at least one second electrode (6), - comprising a lid-shaped second component (10), - the outer edge of the second component (10) is fixed to the upper rim of the side wall (3) by at least one sealing connection (21) which seals the interior of the battery (20) from the environment and is electrically conductive, - the first component or the second component comprises a central electrically conductive portion (11), a peripheral electrically conductive portion (12), and an insulating portion (13) which separates the central electrically conductive portion (11) from the peripheral electrically conductive portion (12) and electrically insulates it, - another component is electrical A conductive material is integrally formed, and the electrodes (5, 6) of the electrode assembly are electrically connected to the components in such a way that the central electrically conductive portion (11) included in one component forms the first contact of the battery and the other component forms the second contact of the battery, and the rim (20') of the side wall (3) includes a conical portion (22), and the outer edge of the second component (10) includes a conical portion (25) complementary to the conical portion (22) of the rim, and the conical portions (22, 25) of the rim and the second component are in physical contact with each other, and the rim (20') and the outer edge further include stepped portions (23, 24), and the stepped portions are also in physical contact with each other, and the rim (20') is provided with a negative conical portion (22), and the edge A positive conical portion (25) is provided,- The stepped portion (23) of the rim (20') is a first stepped portion positioned radially outside the conical portion (22), - the rim (20') includes an additional stepped portion (26) radially outside the first stepped portion (23), and - the edge of the second component (10) is essentially at the same level as the additional stepped portion (26), a button battery. Claim 2 In claim 1, the button battery, wherein at least one sealing connection (21) is a welded connection. Claim 3 In claim 1, the base (2) of the cup-shaped container (1) is circular in shape, a button battery. Claim 4 A button battery according to claim 3, wherein the electrode assembly (4) comprises a wound-up stack of at least one first electrode (5), at least one second electrode (6) and at least one separator sheet (7), and the assembly further comprises current collector strips (8) electrically connected to the at least one first electrode (5) and the at least one second electrode (6), and to the first contact and the second contact of the battery, or vice versa, respectively. Claim 5 In claim 1, the electrode assembly (4) is a button battery, which is a stacked electrode assembly. Claim 6 In claim 1, the second component (10) of the lead shape is a button battery oriented perpendicularly to the side wall (3). Claim 7 A button battery according to claim 1, wherein the second component (10) of the lead shape or the side wall (3) comprises a truncated part (30). Claim 8 A method for assembling a button battery according to any one of claims 1 to 7, comprising: - aligning the edge of the second component (10) to the rim (20') of the side wall (3) of the first component (1); - inserting the conical portion (25) of the edge of the second component (10) into the conical portion (22) of the rim (20') of the side wall (3) or vice versa, so that the conical portions (22, 25) come into contact with each other; - fixing the edge of the second component (10) to the rim (20') of the side wall (3) by at least one sealing connection (21), wherein stepped portions (23, 24) are provided on the rim (20') of the side wall (3) and the edge of the second component (10), and the insertion of the conical portion is such that the stepped portions come into contact with each other A method for assembling a button battery, wherein the step of fixing the edge of the second component (10) to the rim (20') of the side wall (3) is stopped when contact is initiated, and is performed by one of the following techniques: welding, gluing with a polymer-based adhesive, or curing, wherein the applied technique is friction welding, and at least one of the components comprises a conical portion having a sharp end (35, 36), and another component comprises a stepped portion or surface, wherein the stepped portion or surface is configured such that the sharp end contacts the stepped portion or surface after the insertion step, and during the fixing step, the material of at least one of the components around the sharp end or ends is locally melted in the vicinity, thereby creating at least one welded connection (21). Claim 9 delete Claim 10 delete Claim 11 delete Claim 12 delete

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