Button cell battery

Abstract

To provide a button battery to be sealed.SOLUTION: A button battery according to the present invention, comprises: a first component having a form of a cup-like container; an electrode assembly inserted into the container; and a second lid-like component 10 that is fixed to an upper rim 20' of a side wall 3 of the container along an external own edge. The first component and the second component 10 contain three parts including a conductive center part, a conductive peripheral part, and a middle part that separates the center part from the peripheral part to make it insulate. Each shape of the side wall 3 of the first component and an edge of the second component has complementary diameter change parts 22 and 25 that are contacted each other in a battery to be assembled. In a preferable embodiment, the edge of the lid 10 and the rim of the side wall 3 further provide step parts 23 and 24 constructed so as to fix a stopper for stopping an insertion of one radial change part into the other radial change part.SELECTED DRAWING: Figure 5a

Description

[Technical field]

[0001] The present invention relates to button batteries, which are well known as power sources for small electrically driven appliances such as portable watches (eg, wristwatches and pocket watches) and thermometers. [Background technology]

[0002] Button batteries, also known as button cells, are widely used and available in several types, characterized by different configurations and shapes, and the materials used for the electrodes and electrolyte.

[0003] Most known types of button cells have a metal bottom cup with a flat base portion that serves as a positive contact and an upstanding side wall extending upward from the flat base portion, and a metal top cup. The flat base portion of the top cup serves as a negative contact. The button cell further comprises an electrode assembly in the space between the top cup and the bottom cup. For example, in a rechargeable lithium-ion button cell, the electrode assembly may be a spiral assembly obtained by rolling a stack of electrode layers separated by separator sheets impregnated with a liquid electrolyte. Other electrode assemblies are formed as a horizontal stack of alternating electrode layers and separator layers oriented parallel to the top and bottom contacts. Button cells are often in the form of a circular disk, although other shapes are possible.

[0004] The manufacturing process for the above type of battery involves placing the electrode assembly in a top cup, inserting the top cup into a bottom cup, and placing a gasket or adhesive-type electrically insulating seal between the top cup and bottom cup to seal the electrode assembly against the exterior of the battery. If a physical gasket is used, the open end of the wall of the top cup is inserted into the gasket and the bottom cup is crimped to the gasket. If an adhesive-type insulating seal is used, the outside of the side wall of the top cup is coated with a sealant before inserting the top cup into the bottom cup. The adhesive is allowed to dry or harden to seal the battery.

[0005] These known methods of sealing batteries have many challenges, one of which is the double wall construction required to accommodate the gasket or adhesive: the side walls of the top cup and the bottom cup must overlap, which wastes space that the insulating seal would otherwise occupy as a physical gasket or sealing adhesive.

[0006] A solution to this problem has been considered 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 comprises a bottom cup that comprises the electrode assembly and serves as the positive contact. The battery further comprises a lid formed by 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 central part serves as the negative contact and the insulating part provides electrical insulation. The lid is fixed to the open end of the cup to seal the battery from the outside. The fixed connection between the lid and the cup is made electrically conductive such that the base of the cup forms the positive contact of the battery.

[0007] Challenges encountered in the manufacturing process of this battery type relate to the process of fastening the lid to the cup, which can be done by aligning the lid against the rim of the sidewall of the cup and welding (e.g., laser welding) the lid to the rim along the aligned periphery of the lid. However, to obtain a perfectly sealed welded connection, the dimensional configurations of the lid and the cup must match with high precision. Also, due to the small dimensional configuration of this type of battery, it is difficult to keep the lid in the correct position during the welding process. Such issues can lead to incomplete welds and the risk of chemicals leaking from inside the battery. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention aims to provide a way of overcoming the above problems. This aim is achieved by a button cell and a method for assembling and producing such a cell as claimed in the appended claims. The button cell according to the invention comprises a first component in the form of a cup-shaped container, an electrode assembly inserted in the container, and a second component in the form of a lid fixed along its outer edge to the upper rim of the upright side wall of the container. Either the first or the second component has three parts: an electrically conductive central part, an electrically conductive peripheral part, and an intermediate part separating and insulating the central part from the peripheral part. The other component is homogeneously formed of an electrically conductive material. The electrodes of the electrode assembly are electrically connected to the components such that the electrically conductive central part of one component forms one contact of the battery and the other component forms the other contact of the battery.

[0009] In the battery according to the invention, the sidewall of the cup-shaped container and the edge of the lid-like second component are shaped to have complementary diameter-changing portions that are in contact with each other in the assembled battery, said complementary diameter-changing portions allowing the lid to be autonomously aligned to the rim of the sidewall during assembly of the battery, and these diameter-changing portions contribute to maintaining the lid on the container during a sealing process, which can be a process of welding the lid to the container along the common periphery of the edge of the lid and the rim of the sidewall. In some preferred embodiments, the edge of the lid and the rim of the sidewall further have step portions configured to form a stop for stopping the insertion of one diameter-changing portion into the other diameter-changing portion. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 shows the main components of a battery comprising a wound electrode assembly according to prior art European patent application EP22178203. [Diagram 2] 2 shows the battery of FIG. 1 in an assembled state. [Diagram 3] FIG. 3 shows a cross-sectional view of the cup and lid of the battery of FIGS. 1 and 2 prior to the sealing process. [Figure 4a] 4a and 4b show typical cross sections of the sidewall rim and lid edge of the cell of FIGS. 1-3. [Figure 4b] 4a and 4b show typical cross sections of the sidewall rim and lid edge of the cell of FIGS. 1-3. [Figure 5a] Figures 5a and 5b show a cross section of a cell according to one embodiment of the invention where the rim of the sidewall meets the edge of the lid. [Figure 5b] Figures 5a and 5b show a cross section of a cell according to one embodiment of the invention where the rim of the sidewall meets the edge of the lid. [Figure 6a] Figures 6a and 6b show an embodiment having a similar rim and edge profile to the several previous figures, except that there is an additional step in the rim of the sidewall. [Figure 6b] Figures 6a and 6b show an embodiment having a similar rim and edge profile to the several previous figures, except that there is an additional step in the rim of the sidewall. [Figure 7] 5 shows a cross section of the rim and edge similar to FIG. 5, except for a cell with a thinner sidewall thickness. [Figure 8a] 8a and 8b show an embodiment in which the cross-sectional diameter change portions of the rim and edge are reversed with respect to the embodiment of FIGS. [Figure 8b] 8a and 8b show an embodiment in which the cross-sectional diameter change portions of the rim and edge are reversed with respect to the embodiment of FIGS. [Figure 9a] Figures 9a and 9b show embodiments where there is a defect in the lid itself or in the sidewall. [Figure 9b] Figures 9a and 9b show embodiments where there is a defect in the lid itself or in the sidewall. [Figure 10a] 10a and 10b show an embodiment of the invention in which the cup-shaped component has a conductive central portion and a peripheral portion separated by an insulating portion, and the lid-shaped component is formed uniformly from a conductive material. [Figure 10b] 10a and 10b show an embodiment of the invention in which the cup-shaped component has a conductive central portion and a peripheral portion separated by an insulating portion, and the lid-shaped component is formed uniformly from a conductive material. [Figure 11a] 11a-11c show a joining sequence of a lid-like component and a cup-like component using friction welding as a method for providing a sealed connection between the components, according to one embodiment of the present invention. [Figure 11b] 11a-11c show a joining sequence of a lid-like component and a cup-like component using friction welding as a method for providing a sealed connection between the components, according to one embodiment of the present invention. [Figure 11c]11a-11c show a joining sequence of a lid-like component and a cup-like component using friction welding as a method for providing a sealed connection between the components, according to one embodiment of the present invention. [Figure 12a] 12a-12c show another example of a battery according to the invention, in which the components are connected by friction welding. [Figure 12b] 12a-12c show another example of a battery according to the invention, in which the components are connected by friction welding. [Figure 12c] 12a-12c show another example of a battery according to the invention, in which the components are connected by friction welding. [Figure 13a] 13a-13c show another example of a battery according to the invention, in which the components are connected by friction welding. [Figure 13b] 13a-13c show another example of a battery according to the invention, in which the components are connected by friction welding. [Figure 13c] 13a-13c show another example of a battery according to the invention, in which the components are connected by friction welding. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] FIG. 1 shows the components of a rechargeable lithium-ion battery according to European Patent Application EP 22178203. The battery comprises a conductive cup-shaped bottom container 1, preferably made of metal, including a rounded base 2 and an upstanding side wall 3 along the periphery of the base 2. The battery also comprises a wound electrode assembly 4 consisting of a positive electrode 5, a negative electrode 6 and a separator sheet 7 between the wound electrodes, and further comprises a current collector strip 8. The depiction of the electrode assembly 4 is simplified and the assembly 4 can be realised according to any known design. Only the negative current collector strip 8 connected to the negative electrode 6 is visible in the drawing. The positive current collector strip connected to the positive electrode 5 is present below the electrode assembly 4. The current collector strip 8 is shown in simple form as a straight rectangular strip, but can be of different shapes. As known to those skilled in the art, the current collector strip 8 is preferably flexible so that the ends of the strip can be welded to the respective battery contacts.

[0012] The battery comprises a lid 10 having three portions: an electrically conductive central portion 11, an electrically conductive peripheral portion 12, and an electrically insulating intermediate portion 13 that separates and electrically insulates the central portion 11 and the peripheral portion 12 from one another. These three portions 11-13 form one unitary body; that is, the intermediate portion 13 is joined to the conductive portions 11 and 12 along their corresponding inner and outer edges. In the embodiment shown in FIG. 1, all three portions 11, 12, 13 of the lid 10 have the same thickness. In alternative embodiments, the thicknesses of these portions can be different.

[0013] The materials used for these parts 11, 12 and 13 are mechanically strong and chemically stable with respect to the materials inside the battery. The conductive parts 11 and 12 can be made of the same material as the bottom container 1, preferably metal. Suitable metals include nickel, cobalt and certain types of stainless steel such as SS304 and SS316. The material of the insulating part 13 can also be hermetically bonded to the materials used for parts 11 and 12. The insulating part 13 can be made of, for example, glass, certain types of rubber, PTFE (polytetrafluoroethylene) or any derivative thereof. The lid 10 can be manufactured by well-known processes for joining different materials together.

[0014] Assembly of the battery according to the illustrated embodiment involves 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 said container. Liquid electrolyte is poured into the container 1 and a negative current collector strip 8 is welded to a central portion 11 of a lid 10. The lid 10 is then placed onto a side wall 3 of the cup-shaped container 1 and joined to the side wall 3 along its outer edge by a joining technique that provides a sealed connection between the lid 10 and the container 1 to obtain the completed battery shown in FIG. 2. The sealed connection can be provided by welding, such as laser welding.

[0015] The battery has a positive contact formed by the base 2 of the cup-shaped container 1 and a negative contact formed by the central portion 11 of the lid 10. These contacts are electrically insulated from each other by the middle portion 13 of the lid 10. The sealed connection of the edge of the lid to the rim of the upstanding wall 3 is electrically conductive, sealing the interior of the battery 20 from the environment.

[0016] FIG. 3 shows a cross-section of the cup 1 with the lid 10 aligned with the rim 20 of the side wall 3 before realizing the sealing connection. The electrode assembly is not shown in this figure. The side wall 3 can have a rectangular cross-section, as shown in the enlarged detail view in FIG. 4a. That is, the rim 20 can be substantially perpendicular to the side of the side wall 3. Alternatively, the rim 20 can be slightly convex, as shown by the dotted line in FIG. 4a. The latter cross-section typically occurs when the cup is made by a deep drawing process. In the example shown, the thickness of the lid 10 and the side wall 3 is the same, but they can also be slightly different in thickness. In most batteries, these thicknesses are of the order of a few tens of millimeters. For example, the thickness of the side wall 3 can be in the range of 0.1 mm to 0.3 mm and the thickness of the lid 10 can be in the range of 0.1 mm to 0.5 mm. In a preferred embodiment, the thickness of the side wall 3 is 0.15 mm and the thickness of the lid 10 is 0.2 mm.

[0017] Lid diameter D L is the outer diameter D of the side wall 3 W1 The lid 10 is configured to match (i.e., be as close as possible to) the outer diameter D of the side wall 3. W1 4b, the assembly undergoes a welding process, such as laser welding, to create a welded connection 21 along the aligned periphery of the rim 20 and the lid 10. The welded connection 21 is symbolically represented as a black semicircle in the illustrated illustration, but in reality can 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 at the beginning, for the welding process to be effective in sealing the interior of the cell, the diametric match and alignment of the lid 10 and sidewall 3 must be very precise, and any displacement of the lid 10 during the welding process can make it difficult to obtain an effective seal.

[0019] According to the invention, the shape of the rim of the side wall 3 and the edge of the lid 10 improves the quality of the sealing connection by reducing alignment difficulties and errors due to displacement. Figures 5a and 5b show one embodiment of the invention. It can be seen that the rim 20' of the side wall 3 has a diameter change section (conical section) 22 and a step section 23. The step section 23 is a step that is smaller than the outer diameter D of the rim 20'. W1 and the intermediate diameter D i The diameter change portion 22 extends between the intermediate diameter D i and the inner diameter D of the rim 20' W2 The edge of the lid 10 is shaped to have a step 24 along the outer diameter of the lid 10 and a diameter transition 25 radially inward of the step 24. The diameter transitions 22 and 25 are complementary, i.e., they have the same slope angle so that the outer diameter transition surface of the lid 10 fits into the inner diameter transition surface (conical surface) of the rim 20'.

[0020] Now, assembling the lid 10 to the cup 1 involves inserting the diameter change portion 25 of the lid 10 into the diameter change portion 22 of the cup until the step portion 24 of the lid stops at the step portion 23 of the cup. Thus, at this point, both the diameter change portions 22 and 25 and the step portions 23 and 24 are in contact with each other. Thereafter, a weld connection 21 is made along the aligned peripheries of the step portions 23 and 24, as shown in Figure 5b.

[0021] This configuration allows for improved alignment of the side wall 3 with respect to the rim 20' due to the self-aligning nature of the complementary diameter change portions 22 and 25. The insertion of one diameter change portion into the other also provides a mechanically stable temporary connection between the lid 10 and the side wall 3, which makes the alignment easier to maintain during the welding process. L Preferably, the outer diameter D of the side wall 3 is adjusted to the same degree of accuracy as in the designs of FIGS. W1 , but in this case, given that proper alignment is ensured, a slightly greater difference between the diameters can be tolerated without compromising the quality of the welded connection.

[0022] However, in another embodiment, as shown in Figs. 6a and 6b, the diameter D L is intentionally smaller than the outer diameter of the side wall 3. Here, the rim 20' has an additional step portion 26 radially outward of the first step portion 23. As shown in FIG. 6b, the additional step portion 26 is located radially outward of the diameter D of the lid 10. L and the height of the step 24 of the lid is substantially equal to the height of the additional step 26, so that the lid 10 is substantially the same height as said additional step 26 in the assembled cell. This self-alignment is ensured as above thanks to the corresponding diameter changes 22 and 25 and step portions 23 and 24. However, in this case the welded connection 21 is made from above, along the periphery of the lid 10, rather than from the side. In some cases this approach is more practical.

[0023] Figure 7 shows an embodiment in which the thickness of the upright wall 3 is smaller than the thickness of the lid 10. In all the embodiments described so far, the inclination angle α between the complementary radial change portions is about 30°, as shown in Figure 5b. However, this angle can be selected differently, depending on the thickness of the side wall 3 etc. For example, if the side wall 3 is significantly thicker than some of the above examples, it may be preferable to increase the inclination angle α.

[0024] Figures 8a and 8b show an embodiment in which the angle of inclination of the diameter transitions 22 and 25 is reversed compared to some previous embodiments. Here, the rim 20' of the side wall 3 has an outer diameter transition surface, while the lid 10 has an inner diameter transition surface which fits into the outer diameter transition surface of the rim 20'. Here again, the steps 23 and 24 are present, with the same function as above.

[0025] The invention is not limited to embodiments in which the lid 10 and side wall 3 are perpendicular to each other. Figures 9a and 9b show embodiments in which the lid 10 or upright wall 3, respectively, have a reduced area 30 which tapers towards the top of the cell. It can be seen that the rim of the upright wall 3 and the edge of the lid 10 in these embodiments also have the abovementioned diameter change and step.

[0026] Also, the invention is not limited to the embodiment in which the lid 10 has a conductive central portion 11 and a peripheral portion 12 separated by an insulating portion 13. In an alternative embodiment, the cup-shaped container 1 has these portions 11, 12 and 13, and the lid 10 is uniformly formed of a conductive material. An example of such an embodiment is shown in Figures 10a and 10b, where it can be seen that the base 2 of the cup-shaped container 1 has the portions 11, 12 and 13. Thus, in a more general sense, as reflected in the language of the appended claims, a battery according to the invention comprises a first component 1 having the shape of a cup-shaped container and a second component 10 in the form of a lid, any one of which may have the portions 11, 12 and 13.

[0027] For the embodiment shown in FIGS. 10a and 10b, all the variations of the invention are applicable with regard to the matching cross-sections of the rim 20' of the side wall 3 and the edge of the lid 10. FIG.

[0028] Although it is preferred that the rim 20' of the upright wall 3 and the edge of the lid 10 have step portions 23 and 24, the invention includes embodiments in which these step portions are absent, i.e., the lid 10 and the rim 20' only have complementary radially changing portions that can achieve the self-aligning properties and temporary connection by themselves. In this case, care must be taken so that the insertion of one radially changing surface into the other can stop at the correct relative position of the radially changing portions to create a connection that effectively seals the interior of the battery.

[0029] In another embodiment, only one component has a step and the other component does not have a step before joining the components. Such an embodiment can be applied, for example, when the components are joined by friction welding. Figures 11a-11c show an embodiment similar to that of figures 8a and 8b. The rim of the side wall 3 has a radius change 22 and a step 23 as in figure 8a, but the edge of the lid 10 has only a radius change 25 with a sharp edge 35 and no step configured to contact the step 23 of the wall 3. As shown in figure 11b, the sharp edge 35 contacts the step 23 when the lid 10 is placed on the side wall 3. Similarly, the sharp upper edge 36 of the radius change 22 of the side wall 3 contacts the inner surface of the lid 10. In the state shown in figure 11b, the components are friction welded together, for example in an ultrasonic welding tool. At least one of the materials of the side wall 3 and the lid 10 in the contact area of ​​the sharp edges 35 and 36 is brought to a temperature greater than the melting temperature, so that the material melts locally and forms a welded connection. FIG. 11c shows the joined components after the welding step. Due to the local melting of the materials, the lid 10 is lowered slightly relative to the side wall 3 to a position where the side of the lid 10 and the side wall 3 are substantially flush. This embodiment shows that the components can be connected by a plurality of welded connections 21. This embodiment also shows that the step portion 23 can be made indistinguishable in the finished battery, since it is surrounded by the lower welded connection 21. Also in the embodiment as shown in FIGS. 5a and 5b, the step portions 23 and 24 can be made indistinguishable in the finished battery, if the welded area 21 extends beyond the width of the step portions 23 and 24.

[0030] Figures 12a-12c and 13a-13c show another embodiment related to friction welding. As shown in Figure 12a, both the side wall 3 and the edge of the lid 10 have corresponding step portions 23 and 24 and equally corresponding diameter change portions 22 and 25 as in Figures 8a and 8b, but here the diameter change portion 22 of the side wall 3 is longer, so that when the lid 10 is placed on the side wall 3 (as shown in Figure 12b), the sharp edge 36 of the side wall 3 comes into contact with the inner surface of the lid 10 before the step portions 23 and 24 can start to come into contact with each other. This assembly is then subjected to friction welding to obtain the joined assembly shown in Figure 12c. The welded connection 21 is formed by local melting around the sharp edge 36, which causes the lid 10 to go down until it is stopped by the contact of the step portions 23 and 24 with each other. Thus, in this case the step portion serves the function of positioning the lid during the welding step, but not before it.

[0031] Figures 13a-13c show a similar embodiment, but here the side wall 3 has an additional step 37 radially inward of the diameter change section 22. As shown in Figure 13b, here the sharp edge 35 of the diameter change section 25 of the lid contacts the step section 23 before the second step section 37 contacts the inner surface of the lid 10. After friction welding the step section 37 and the inner surface are in contact with each other while the welded connection 21 is formed along the circumference of the assembly.

[0032] In the above embodiment, the steps 23, 24 and 26 are depicted as being straight and with an upper surface substantially parallel to the base 2 of the cup 1. However, these steps may be slightly rounded, for example if the rim 20' is obtained by molding a convex rim as shown by the dotted line in Figure 4a. The molding of the rim 20' of the edge of the lid 10 and of the side wall 3 may be performed by standard machining techniques.

[0033] The battery according to the present invention is not limited to a circular shape, but can have any other shape, such as a rectangular or square shape.

[0034] In some embodiments described above, the bottom contact is referred to as the positive contact and the top contact is referred to as the negative contact, but the invention is not limited to that configuration and is therefore referred to as "first and second" contacts in the appended claims.

[0035] Generally, with reference to any one of the embodiments shown in the drawings, a method for assembling a battery according to any embodiment of the present invention may include the steps of: - an alignment step in which the edge of the second component 10 is aligned with the rim 20' of the side wall 3 of the first component 1; - an insertion step in which the portion 25 of the edge of the second component 10 that changes diameter is inserted into the portion 22 of the rim 20' of the side wall 3 or vice versa (i.e. the portion 22 of the rim 20' that changes diameter is inserted into the portion 25 of the lid 10 that changes diameter, as in figures 8a and 8b), so that the portions 22, 25 that change diameter are in contact with each other; a fixing step of fixing the edge of the second component 10 to the rim 20' of the side wall 3 by a sealed connection; Equipped with.

[0036] The steps of "aligning" and "insertion" relate to relative motion of components, for example, alignment can be achieved by actively moving the lid relative to a fixed container or by moving the container relative to a fixed lid, and insertion can be achieved by actively inserting a convex diameter changing surface into a stationary concave diameter changing surface or by placing a concave diameter changing surface on a stationary convex diameter changing surface.

[0037] If both components have step portions 23 and 24, the relative insertion of the diameter change portions may be completed when these step portions come into contact, and the fastening step is then performed, for example by forming a welded connection along the periphery of the step portions as shown in Figures 5a and 5b. In other embodiments involving friction welding, for example as shown in Figures 12a-12c, the step portions only come into contact during the fastening step.

[0038] The method according to the invention is not limited to the embodiment in which the final step of fastening the components is performed by laser welding or friction welding. Other types of welding can be applied, such as arc welding. Besides welding, other joining techniques can be applied, such as gluing or applying a polymer-based adhesive which is then cured. Which approach is most suitable may depend on the cross-sectional shape of the components to be joined.

[0039] Although the invention has been illustrated and described in detail in the drawings and the above description, such illustrations and descriptions are to be considered as illustrative and exemplary, and not restrictive. Other variations to the disclosed embodiments can be understood and realized by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure and the claims. In the claims, the term "comprising" does not exclude the presence of other elements or steps, nor does it exclude a plurality of the singular. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Reference signs in the claims should not be interpreted as limiting the scope. [Explanation of symbols]

[0040] 1. First Component 2. Bass 3 side wall 4 Electrode Assembly 5 First electrode 6 Second electrode 7. Isolation Sheet 8 Current collector strip 10 Second Component 13 Insulation 20, 20' rim 21 Seal Connection 22, 25 Diameter change part 23rd and 24th step part 26 Additional steps 30 Deficiency 35, 36 Sharp Edge

Claims

1. A button cell comprising a first component (1) in the form of a cup-like container and a second component (10) in the form of a lid, The container has a base (2) and a sidewall (3) along the periphery of the base; Within the container is an electrode assembly (4) including at least one first electrode (5), one or more separator sheets (7) and at least one second electrode (6); the outer edge of the second component (10) is fixed to the upper edge of the side wall (3) by at least one electrically conductive connection (21) that seals the interior of the battery from the environment; Either the first component or the second component has an electrically conductive central portion (11), an electrically conductive peripheral portion (12), and an insulating portion (13) that separates and electrically insulates the central portion (11) from the electrically conductive peripheral portion (12); The other components are integrally formed from a conductive material; the first and second electrodes (5, 6) of the electrode assembly are electrically connected to the components such that a conductive central portion (11) of one component forms a first contact of the battery and the other component forms a second contact; The rim (20') of the side wall (3) has a diameter change portion (22), the outer edge of the second component (10) has a portion of change in diameter (25) complementary to the portion of change in diameter (22) of the rim; the rim and the diameter changing portion (22, 25) of the second component are in physical contact with each other; The rim (20') and the outer edge further include stepped portions (23, 24); The stepped portions are also in physical contact with each other. A battery characterized in that

2. The rim (20) has a concave diameter change portion (22) and the outer edge has a convex diameter change portion (25); the step portion (23) of the rim (20') is a first step portion radially outward of the diameter change portion (22); The rim (20') has an additional step portion (26) radially outward of the first step portion (23); The edge of the second component (10) is substantially flush with the additional step portion (26).

2. The battery according to claim 1 .

3. The at least one sealed connection (21) is a welded connection.

2. The battery according to claim 1 .

4. The base (2) of the cup-shaped container (1) is circular.

2. The battery according to claim 1 .

5. The electrode assembly (4) includes a wound stack of at least one first electrode (5), at least one second electrode (6), and at least one separator sheet (7), The electrode assembly further comprises current collecting strips (8) electrically connected to the at least one first electrode (5), the at least one second electrode (6), and a first contact and a second contact of the battery, respectively.

5. The battery according to claim 4.

6. The electrode assembly (4) is a laminated electrode assembly.

2. The battery according to claim 1 .

7. The lid-like second component (10) is oriented perpendicular to the side wall (3).

2. The battery according to claim 1 .

8. The lid-like second component (10) or the side wall (3) has a missing portion (30).

2. The battery according to claim 1 .

9. A method for assembling and making the button cell of claim 1, comprising the steps of: an alignment step of aligning the edge of the second component (10) with the rim (20') of the side wall (3) of the first component (1); an insertion step of inserting the diameter changing portion (25) of the edge of the second component (10) into the diameter changing portion (22) of the rim (20') of the side wall (3) or inserting the diameter changing portion (22) of the rim (20') of the side wall (3) into the diameter changing portion (25) of the edge of the second component (10) so that the diameter changing portions (22, 25) come into contact with each other; and a fixing step of fixing said edge of said second component (10) to said rim (20') of said side wall (3) by at least one sealing connection (21), the rim (20') of the side wall (3) and the edge of the second component (10) have step portions (23, 24); When the stepped portions come into contact with each other, the insertion of the diameter changing portion is stopped. A method comprising:

10. The step of fixing the edge of the second component (10) to the rim (20') of the side wall (3) is carried out by one of the following techniques: welding, gluing, curing of a polymer-based adhesive.

10. The method of claim 9.

11. The technique is laser welding or friction welding.

11. The method of claim 10.

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