Button cell and electronic device

Abstract

The application relates to a button cell and an electronic device, the button cell comprising: a shell, the shell comprising a first half shell and a second half shell; the first half shell comprising a first end face and a first side wall arranged around the first end face; the second half shell comprising a second end face and a second side wall arranged around the second end face; the second side wall is sleeved outside the first side wall, and an insulating sealing ring is arranged between the first side wall and the second side wall; a winding core is arranged inside the shell, the winding core is in a winding structure, two end faces of the winding core are opposite to the first end face and the second end face respectively, and two tabs are arranged on the winding core; at least one of the first end face and the second end face is provided with a protruding structure and is connected with the corresponding tab through the protruding structure, and the protruding structure protrudes to the inside of the shell.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to a button battery and an electronic device. Background Technology

[0002] Button batteries are widely used due to their small size, large capacity, and good consistency. During the assembly of button batteries, the casing and tabs need to be welded to achieve electrical connection between the casing and the core to form electrodes. In related technologies, the tabs are not easily positioned during welding, leading to situations where the casing and tabs are not welded properly or the weld is not strong enough. Summary of the Invention

[0003] One object of the present invention is to provide a new technical solution for button batteries and electronic devices.

[0004] According to a first aspect of the present invention, a button cell battery is provided, the button cell battery comprising:

[0005] A housing, the housing comprising a first half-shell and a second half-shell;

[0006] The first half-shell includes a first end face and a first sidewall disposed around the first end face;

[0007] The second half-shell includes a second end face and a second sidewall disposed around the second end face;

[0008] The second sidewall is fitted over the outside of the first sidewall, and an insulating sealing ring is provided between the first sidewall and the second sidewall;

[0009] The core is disposed inside the housing. The core has a wound structure. The two end faces of the core are respectively opposite to the first end face and the second end face. Two tabs are provided on the core.

[0010] At least one of the first end face and the second end face is provided with a protruding structure and is connected to the corresponding electrode tab through the protruding structure, the protruding structure protruding towards the inside of the housing.

[0011] Optionally, the core has a through hole in the middle, and at least a portion of the protrusion structure is located within the through hole.

[0012] Optionally, in the radial direction of the through hole, the size of the protrusion structure is less than or equal to the size of the through hole.

[0013] Optionally, the core has a through hole in the middle, and the projection of the protrusion structure on the end face of the core at least partially covers the through hole.

[0014] Optionally, the protrusion structure can be a spherical protrusion, an annular protrusion, a strip-shaped protrusion, a radial protrusion, or the top of the protrusion structure can be a planar structure.

[0015] Optionally, a core post is disposed within the through hole, and the core post abuts against the electrode tab; or

[0016] A core post is provided inside the through hole, and an axial cavity is provided inside the core post. The core post abuts against the electrode tab, and at least a portion of the protruding structure is located within the axial cavity.

[0017] Optionally, at least one of the tabs is connected to the inner wall of the through hole.

[0018] Optionally, the height of the protrusion protruding into the inner side of the housing is greater than or equal to 0.05 mm.

[0019] Optionally, the electrode tab is provided with a groove, and the protruding structure is disposed in the groove, with the top of the protruding structure contacting the bottom of the groove.

[0020] Optionally, the tab includes a first portion and a second portion connected to the first portion. The first portion is connected to the core. The second portion of one tab is located between the end face of the core and the first end face and is connected to the first end face. The second portion of the other tab is located between the end face of the core and the second end face and is connected to the second end face.

[0021] Optionally, the first end face is welded to the electrode tab or the second end face is welded to the electrode tab using a double-needle welding head.

[0022] Optionally, at least one of the first half-shell and the second half-shell is a one-piece molded structure.

[0023] Optionally, the first end face or the second end face may be provided with a plurality of the protrusion structures.

[0024] Optionally, recessed structures are provided on the outer side of the first end face or the second end face and at positions corresponding to the plurality of protruding structures, and welding is applied from the recessed structures.

[0025] Optionally, the plurality of protrusion structures include a first protrusion structure and a second protrusion structure, wherein the first protrusion structure and the second protrusion structure are symmetrically arranged with respect to the center of the first end face or the center of the second end face.

[0026] Optionally, a double-needle welding head is used to weld at the recessed structure corresponding to the positions of the first protruding structure and the second protruding structure, with the two welding heads corresponding one-to-one with the two recessed structures.

[0027] Optionally, a recessed structure is constructed on the outer side of the first end face or the second end face, at a position opposite to the protruding structure.

[0028] Optionally, the protrusion structure is an annular protrusion, and an annular groove is formed on the outer side of the first end face or the second end face and at a position opposite to the annular protrusion.

[0029] Optionally, at least two solder joints may be formed on the annular protrusion.

[0030] Optionally, a double-needle welding head is used to weld the electrode tab to the annular protrusion, the double-needle welding head being applied within the annular groove.

[0031] Optionally, the width of the recessed structure gradually increases from the bottom of the recessed structure to the opening end.

[0032] Optionally, the protrusion structure is located on the first end face or the second end face at a position opposite to the through hole in the middle of the core.

[0033] Optionally, one of the two tabs is connected to the positive electrode of the winding core, and the other is connected to the negative electrode of the winding core. The protruding structure is provided on the second end face, with one tab connected to the protruding structure and the other tab connected to the first sidewall.

[0034] Optionally, the two tabs extend from the same end face of the core; or one tab extends from one end face of the core and the other tab extends from the other end face of the core.

[0035] Optionally, the first sidewall includes a first portion connected to the first end face and a second portion connected to the first portion, the second portion protruding radially outward relative to the first portion, and a tab connected to the sidewall is connected to the second portion.

[0036] Optionally, the second sidewall is rolled inward at the junction of the first part and the second part.

[0037] According to a second aspect of the present invention, an electronic device is provided, the electronic device comprising a button battery as described in any one of the first aspects.

[0038] One technical advantage of this invention is that it provides a protruding structure extending inwards from the housing, allowing the electrode tab to connect to its end face via this protruding structure. The protruding structure extending inwards from the housing allows for close contact with the electrode tab, making it easier for the electrode tab to contact and be positioned with the housing, thus ensuring effective welding to connect the housing and the electrode tab.

[0039] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0040] The accompanying drawings, which form part of this specification, illustrate embodiments of the invention and, together with the specification, serve to explain the principles of the invention.

[0041] Figure 1 This is one of the structural schematic diagrams of a button battery according to an embodiment of this disclosure.

[0042] Figure 2 This is one of the cross-sectional structural schematic diagrams of a button battery according to an embodiment of this disclosure.

[0043] Figure 3 This is a second schematic cross-sectional view of a button battery according to an embodiment of this disclosure.

[0044] Figure 4 This is the third cross-sectional structural schematic diagram of a button battery according to an embodiment of this disclosure.

[0045] Figure 5 This is the fourth cross-sectional structural schematic diagram of a button battery according to an embodiment of this disclosure.

[0046] Figure 6 yes Figure 5 A schematic diagram of the corresponding button cell battery.

[0047] Figure 7 This is the fifth cross-sectional structural schematic diagram of a button battery according to an embodiment of the present disclosure.

[0048] Figure 8 yes Figure 7 A schematic diagram of the corresponding button cell battery.

[0049] Figure 9 This is the sixth cross-sectional structural schematic diagram of a button battery according to an embodiment of the present disclosure.

[0050] Figure 10 This is the seventh cross-sectional structural schematic diagram of a button battery according to an embodiment of the present disclosure.

[0051] Explanation of reference numerals in the attached figures:

[0052] 11. First end face; 12. First sidewall; 121. First part; 122. Second part; 123. Connecting part; 21. Second end face; 22. Second sidewall; 3. Insulating sealing ring; 4. Protruding structure; 41. First protruding structure; 42. Second protruding structure; 43. Annular protrusion; 44. Central protrusion; 45. Annular groove; 46. First recessed structure; 47. Second recessed structure; 5. Core; 50. Through hole; 51. Core post; 52. Axial cavity; 6. First electrode lug; 61. First connecting part; 62. Second connecting part; 7. Second electrode lug; 71. Third connecting part; 72. Fourth connecting part; 8. Groove; 9. Welding head. Detailed Implementation

[0053] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0054] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0055] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0056] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0057] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0058] According to one embodiment of this disclosure, a button battery is provided. Figures 1-4 As shown, the button battery includes:

[0059] The housing has two end faces and a sidewall located between the two end faces. The sidewall is annular. The two end faces are connected to the sidewall to form an accommodating space inside the housing. The shape of the housing can be cuboid, cylinder, etc. For example, one of the two end faces serves as the positive electrode of the battery, and the other serves as the negative electrode.

[0060] In one example, the housing includes a first half-shell and a second half-shell. The first half-shell includes a first end face 11 and a first sidewall 12 surrounding the first end face 11. The second half-shell includes a second end face 21 and a second sidewall 22 surrounding the second end face 21. The second sidewall 22 is fitted over the outside of the first sidewall 12, and an insulating sealing ring 3 is provided between the first sidewall 12 and the second sidewall 22.

[0061] In other examples, the first half-shell includes a shell end face and a sidewall connected to the shell end face. The second half-shell is a cap. The first half-shell has a structure that is open at one end and closed at the other. The cap covers the open end of the first half-shell. The cap serves as another shell end face. An insulating seal is provided between the cap and the first half-shell.

[0062] Of course, the structure of the casing is not limited to the above embodiments, and those skilled in the art can make settings according to actual needs.

[0063] The core 5 is located inside the housing and has a winding structure. The two end faces of the core 5 are respectively opposite to the first end face 11 and the second end face 21. Two tabs are provided on the core 5.

[0064] For example, such as Figures 1-8 As shown, one of the electrodes is connected to the first end face 11, and the other electrode is connected to the second end face 21; alternatively, it can be as follows: Figures 9-10 As shown, one of the electrodes is connected to the first end face 11 or the second end face 21, and the other electrode is connected to the first side wall 12 or the second side wall 22.

[0065] For example, at least one of the first end face 11 and the second end face 21 is provided with a protruding structure 4 and is connected to the corresponding electrode tab through the protruding structure 4. The protruding structure 4 protrudes towards the inside of the housing. The protruding structure 4 protrudes towards the inside of the housing, causing a recess to be formed on the outside of the housing.

[0066] In this embodiment, a protruding structure 4 is provided that extends inward toward the housing, allowing the electrode tab to connect to its end face via the protruding structure 4. The protruding structure 4 extending inward toward the housing can make close contact with the electrode tab, making it easier for the electrode tab to contact and be positioned with the housing, thus ensuring that welding can effectively connect the housing and the electrode tab.

[0067] The tab is connected to the casing via the raised structure 4, allowing the winding core 5 to conduct electricity with the casing through the raised structure 4. When the button battery is in operation, the current between the tab and the casing is transmitted through the raised structure 4, preventing the tab from contacting and conducting with areas on the casing other than the raised structure 4, thus avoiding current shunting.

[0068] For example, one end of the electrode tab is led out from the core 5, and part of the electrode tab's structure overlaps with the protruding structure 4 to form contact. The protruding structure 4 supports the electrode tab, leaving the other end of the electrode tab suspended. This other end has a gap with the housing to avoid contact with the housing and causing current diversion.

[0069] Optionally, the two electrodes include a first electrode 6 and a second electrode 7, wherein the first electrode 6 is connected to the first end face 11 and the second electrode 7 is connected to the second end face 21.

[0070] The first end face 11 and the second end face 21 serve as two external electrodes for the button cell battery. The first tab 6 is connected to the winding core 5, making the first end face 11 an electrode. The second tab 7 is connected to the winding core 5, making the second end face 21 another electrode. For example, the first tab 6 is the positive electrode, and the second tab 7 is the negative electrode.

[0071] At least one of the first end face 11 and the second end face 21 is provided with a protruding structure 4. The protruding structure 4 protrudes into the inside of the shell and contacts the electrode tab, eliminating the gap between the shell and the electrode tab, ensuring the effectiveness of the contact between the electrode tab and the shell, avoiding the failure of welding between the shell and the electrode tab, and ensuring the effectiveness and firmness of the connection between the electrode tab and the shell.

[0072] Optionally, both the first end face 11 and the second end face 21 are provided with protruding structures 4.

[0073] In one embodiment, the height of the protrusion 4 protruding into the inner side of the housing is greater than or equal to 0.05 mm.

[0074] In this embodiment, the height of the protrusion structure 4 is greater than or equal to 0.05 mm, which can ensure effective contact between the protrusion structure 4 and the electrode tab, and further avoid the situation of poor soldering between the shell and the electrode tab.

[0075] In one embodiment, at least one of the first half-shell and the second half-shell is a one-piece molded structure.

[0076] The first end face 11 and the first side wall 12 are integrally formed to form the first half-shell. The second end face 21 and the second side wall 22 are integrally formed to form the second half-shell. The second half-shell is fitted onto the outside of the first half-shell to form the casing of the button battery. The insulating sealing ring 3 serves as an insulating seal between the first side wall 12 and the second side wall 22.

[0077] In one embodiment, both the first end face 11 and the second end face 21 are connected to the tabs by welding. After assembling the button battery casing, the winding core 5, and the tabs, the tabs are connected to the casing by welding on the outside of the casing.

[0078] For example, welding can be laser welding, resistance welding, or ultrasonic welding.

[0079] Optionally, such as Figure 4 As shown in the figure, one of the welding heads 9 in the double-needle welding head is shown. The first end face 11 is welded to the electrode tab or the second end face 21 is welded to the electrode tab by the double-needle welding head. During welding, on the end faces of the first end face 11 and the second end face 21 where the protruding structure 4 is provided, at least one of the double-needle welding heads abuts against the protruding structure 4 from the outside of the housing.

[0080] In one embodiment, such as Figures 2-4 As shown, the core 5 has a through hole 50 in the middle, and at least a portion of the protrusion structure 4 is located within the through hole 50.

[0081] In this embodiment, at least a portion of the protruding structure 4 is located within the through hole 50, which prevents the protruding structure 4 from pressing against the winding core 5 and avoids the protruding structure 4 occupying the space of the winding core 5, thus ensuring the capacity of the winding core 5. This embodiment increases the capacity of the button battery by avoiding the protruding structure 4 occupying the space of the winding core 5 while ensuring that the tabs and the casing can be firmly welded.

[0082] At least a portion of the protruding structure 4 is located within the through hole 50, meaning that at least a portion of the part of the protruding structure 4 that protrudes into the housing is located within the through hole 50. This could be a part of the protruding structure 4 passing through the opening of the through hole 50, or the entire protruding structure 4 passing through the opening of the through hole 50.

[0083] Optionally, the protrusion 4 on the first end face 11 protrudes into the through hole 50. The protrusion 4 on the second end face 21 protrudes into the through hole 50.

[0084] Optionally, the protrusion structure 4 and the through hole 50 can be coaxially arranged, or the axis of the protrusion structure 4 can be offset from the axis of the through hole 50.

[0085] In one embodiment, the size of the protrusion structure 4 is less than or equal to the size of the through hole 50 in the radial direction.

[0086] In this embodiment, the radial dimension of the through hole 50 is larger than that of the protrusion structure 4, which can prevent the protrusion structure 4 from contacting or abutting the opening or wall of the through hole 50 in the structure of the button battery.

[0087] For example, the protruding structure 4 is coaxially arranged with the through hole 50, the protruding structure 4 contacts the electrode tab, and the radial dimension of the protruding structure 4 is smaller. When the distance between the end face of the housing and the core 5 is less than the distance by which the protruding structure 4 extends inward, part of the protruding structure 4 can be housed within the through hole 50, preventing the edge of the protruding structure 4 from abutting against the end face of the core 5 and avoiding structural damage.

[0088] In one embodiment, the core 5 has a through hole 50 in the middle, and the projection of the protrusion 4 on the end face of the core 5 at least partially covers the through hole 50.

[0089] In this embodiment, the tab extends to the end face of the core 5 and is located between the protruding structure 4 and the end face. The protruding structure 4 contacts the tab and compresses it. The projection of the protruding structure 4 onto the end face of the core 5 at least partially covers the through hole 50. The protruding structure 4 is located outside the through hole 50, and at least a portion of the protruding structure 4 covers the through hole 50. The protruding structure 4 and the end face of the core 5 clamp the tab, ensuring effective contact between the protruding structure 4 and the tab.

[0090] In one embodiment, such as Figure 1 , Figure 2 , Figure 4 As shown, the protrusion structure 4 is a spherical protrusion.

[0091] The raised structure 4 protrudes inwards from the shell to form a spherical structure, which contacts the electrode tab. During welding, welding is performed at the apex of the spherical structure. The contact between the apex of the spherical structure and the electrode tab ensures the strength of the weld.

[0092] For example, the vertex of the protrusion 4 on the first end face 11 contacts the first electrode 6, and the protrusion 4 on the first end face 11 is connected to the first electrode 6 by welding at the vertex position of the protrusion 4. Similarly, the protrusion 4 on the second end face 21 is connected to the second electrode 7.

[0093] Optionally, when welding with a dual-needle welding head, one welding head 9 contacts the protruding structure 4, and the other welding head 9 may contact the edge area of ​​the protruding structure 4, or the other welding head 9 may contact the peripheral area of ​​the protruding structure 4.

[0094] In one embodiment, such as Figure 3 As shown, the top of the protruding structure 4 is a planar structure.

[0095] In this embodiment, the top of the protruding structure 4 is a planar structure, which allows for a larger contact surface at the point where the protruding structure 4 contacts the electrode tab, thus increasing the contact area between the electrode tab and the protruding structure 4. This provides a larger welding area for welding. For example, the planar structure at the top of the protruding structure 4 contacts the electrode tab, and welding is performed on the planar structure at the top of the protruding structure 4 to connect the protruding structure 4 to the electrode tab.

[0096] For example, the top of the protrusion 4 on the first end face 11 is a flat structure. The protrusion 4 protrudes inward toward the inside of the housing and contacts the first electrode 6. The flat surface of the top of the protrusion 4 contacts the surface of the first electrode 6, forming a contact surface. During the welding process on the outside of the first end face 11, the protrusion 4 is connected to the first electrode 6 by welding on the outside of the top of the protrusion 4. The flat top of the protrusion 4 can form more weld points, improving the firmness of the connection between the protrusion 4 and the first electrode 6 and avoiding the problem of the electrode not being connected to the housing. Similarly, the top of the protrusion 4 on the second end face 21 is connected to the second electrode 7.

[0097] The raised structure can also be annular, strip-shaped, or radial. Annular raised structures can be circular, rectangular, or elliptical. Strip-shaped raised structures can be straight, wavy, or arc-shaped. Radial raised structures refer to raised structures that radiate from the center of the shell end face towards the edge. Optionally, when welding with a dual-needle welding head, one welding head 9 contacts the central area of ​​the planar structure at the top of the raised structure 4, and the other welding head 9 contacts the edge area of ​​the planar structure at the top.

[0098] Alternatively, the protrusion structure 4 can also be a columnar structure, for example, a cylindrical or prismatic structure.

[0099] In one embodiment, a core post 51 is provided inside the through hole 50, and the core post 51 abuts against the electrode tab.

[0100] The core post 51 supports the electrode tab. The contact between the core post 51 and the electrode tab clamps the electrode tab between the core post 51 and the housing, ensuring tight contact between the first and second end faces of the housing and the electrode tab. This further improves the weld strength between the housing and the electrode tab, preventing incomplete welds. For example, the protruding structure 4 and the core post 51 clamp the electrode tab, allowing the protruding structure 4 to be effectively welded to the electrode tab.

[0101] Alternatively, a core post 51 may be provided in the through hole 50, and an axial cavity 52 may be provided in the core post 51. The core post 51 abuts against the electrode tab, and at least a portion of the protruding structure 4 may be located in the axial cavity 52.

[0102] The core post 51 has an axial cavity 52 forming a tubular structure. The core post 51 supports the electrode tab, and the end face of the core post 51 abuts against the electrode tab. The protruding structure 4 compresses the electrode tab, causing it to deform towards one side of the core post 51. The portion of the electrode tab covering the protruding structure 4 is in close contact with the protruding structure 4. The end of the tube wall of the core post 51 supports the electrode tab. At least a portion of the protruding structure 4 and the electrode tab enters the axial cavity 52, which provides space to accommodate the protruding structure 4 and the electrode tab.

[0103] For example, the protrusion 4 on the first end face 11 squeezes part of the structure of the first electrode tab 6 into the axial cavity 52 of the core column 51, and the end of the tube wall of the core column 51 supports the first electrode tab 6. The protrusion 4 on the second end face 21 squeezes part of the structure of the second electrode tab 7 into the axial cavity 52 of the core column 51, and the end of the tube wall of the core column 51 supports the second electrode tab 7.

[0104] In one embodiment, such as Figures 2-4 As shown, the electrode tab is provided with a groove 8, and the protruding structure 4 is disposed in the groove 8, with the top of the protruding structure 4 contacting the bottom of the groove 8.

[0105] In this embodiment, the groove 8 on the electrode tab is formed by recessing from the outside of the housing towards the inside of the core 5. The protruding structure 4 protrudes inward from the housing, allowing it to engage with the groove 8. The bottom of the groove 8 contacts the top of the protruding structure 4, increasing the contact area between the protruding structure 4 and the electrode tab. This provides a larger area for welding, making welding easier.

[0106] For example, the groove 8 has the same structure as the protrusion structure 4. The groove 8 forms a larger protrusion structure in the direction of the center of the core 5, so that the tab forms a groove on the side facing the shell, making it easier for the protrusion structure 4 to be set into the groove 8.

[0107] For example, the protrusion 4 on the first end face 11 is located within the groove 8 on the first electrode tab 6, and a portion of the groove 8 on the first electrode tab 6 is located within the axial cavity 52. ​​The end of the tube wall of the core post 51 provides support for the groove 8 on the first electrode tab 6. Similarly, the protrusion 4 on the second end face 21 is located within the groove 8 on the second electrode tab 7, and a portion of the groove 8 on the second electrode tab 7 is located within the axial cavity 52. ​​The end of the tube wall of the core post 51 provides support for the groove 8 on the second electrode tab 7.

[0108] Optionally, the housing and the tab are welded by spot welding or double-needle resistance welding.

[0109] For example, spot welding is performed on the outer side of the protruding structure 4 using a bottom spot welding method to connect the protruding structure 4 to the electrode tab. The protruding structure 4 is recessed from the outer side of the shell to the inner side, which makes it easier to perform positioning welding.

[0110] For example, when using double-needle resistance welding, the raised structure 4 provides positioning for welding when welding from the outside of the casing after assembly. The first welding head 9 is positioned at the center of the raised structure 4, and the other welding head welds to the periphery of this positioning. In the assembly structure of the button battery, the raised structure 4 contacts the tabs, forming a tight contact and facilitating welding.

[0111] In one embodiment, such as Figure 3 , Figure 4 As shown, at least one of the tabs is connected to the inner wall of the through hole 50.

[0112] The tab extends from the inner wall of the through hole 50 and connects to the shell, reducing the volume occupied by the tab and saving tab material.

[0113] For example, the first tab 6 is connected to the inner wall of the through hole 50 and leads out to the side where the first end face 11 is located, so that the first tab 6 is connected to the protruding structure 4 on the first end face 11. Similarly, the second tab 7 can also be connected to the inner wall of the through hole 50 and leads out to the side where the second end face 21 is located.

[0114] Optionally, the two tabs are connected to a location other than the inner wall of the through hole 50. For example, the tabs are connected to the side wall of the core 5. The tabs can be connected to one layer of the electrode sheets located in different layers of the winding structure of the core 5.

[0115] The electrode tabs can also be connected to the outside of the winding core 5, extending to the end face of the winding core 5 for connection with the housing.

[0116] In one embodiment, such as Figures 2-4 As shown, the electrode tab includes a first part and a second part connected to the first part. The first part is connected to the core 5. The second part of one electrode tab is located between the end face of the core 5 and the first end face 11 and is connected to the first end face 11. The second part of the other electrode tab is located between the end face of the core 5 and the second end face 21 and is connected to the second end face 21.

[0117] Optionally, the first electrode tab 6 includes a first connecting portion 61 and a second connecting portion 62 connected to the first connecting portion 61. The first part is the first connecting portion 61, which is connected to the winding core 5, and the second part is the second connecting portion 62, which is connected to the first end face 11. The second connecting portion 62 is connected to the first end face 11 through a protruding structure 4.

[0118] For example, the second connecting part 62 is located between the end face of the core 5 and the first end face 11, and the protruding structure 4 on the first end face 11 contacts and is welded to the second connecting part 62. For example, the second connecting part 62 is provided with a groove 8, and the protruding structure 4 extends into the groove 8.

[0119] Optionally, the second electrode tab 7 includes a third connecting portion 71 and a fourth connecting portion 72 connected to the third connecting portion 71. The first part is the third connecting portion 71, which is connected to the winding core 5, and the fourth connecting portion 72 is connected to the second end face 21. The fourth part is the fourth connecting portion 72, which is connected to the second end face 21 through a protruding structure 4.

[0120] For example, the fourth connecting part 72 is laid flat between the end face of the core 5 and the second end face 21, and the protruding structure 4 on the second end face 21 contacts and is welded to the fourth connecting part 72. For example, the fourth connecting part 72 is provided with a groove 8, and the protruding structure 4 extends into the groove 8.

[0121] In one example, by setting multiple protrusions or protrusions 4 with defined shapes, an uneven surface is formed locally on the first end face 11 or the second end face 21. This surface makes the positioning of the tab more precise.

[0122] In one specific example, the first end face 11 or the second end face 21 is provided with a plurality of the protruding structures 4. The plurality of protruding structures 4 can effectively support the electrode tab, making the positioning of the electrode tab more accurate and the contact between the electrode tab and the housing more secure, which is beneficial for forming an electrical connection. For example, as... Figures 5-6 As shown, multiple protrusions 4 are located in the middle of the second end face 21, and at positions corresponding to the through holes 50 of the core 5. Welding at these positions can prevent the weld points from damaging the core 5.

[0123] In one example, such as Figures 5-6 As shown, recessed structures are provided on the outer side of the first end face 11 or the second end face 21, corresponding to the positions of the plurality of protruding structures 4. Welding is applied from the recessed structures. The recessed structures can accurately mark the position where the welding head 9 should be aligned during welding, thereby enabling more precise welding.

[0124] like Figures 5-6 As shown, the protruding structure 4 includes a first protruding structure 41 and a second protruding structure 42. A first recessed structure 46 and a second recessed structure 47 are formed on the outer side of the shell. The first recessed structure 46 is positioned opposite to the first protruding structure 41. The second recessed structure 47 is positioned opposite to the second protruding structure 42. For example, during shell manufacturing, the first half-shell or the second half-shell is integrally formed by stamping or injection molding. The first recessed structure 46 and the second recessed structure 47 are formed on the outer side of the first end face 11 or the second end face 21, and the first protruding structure 41 and the second protruding structure 42 are formed on the inner side of the second end face 21.

[0125] Of course, the method of preparing the shell is not limited to the above embodiments, and those skilled in the art can make settings according to actual needs.

[0126] Optionally, the first protruding structure 41 and the second protruding structure 42 are symmetrically arranged with respect to the center of the first end face 11 or the center of the second end face 21. The tab (e.g., the second tab 7) typically extends to the center of the end face of the core 5. The symmetrical arrangement of the first protruding structure 41 and the second protruding structure 42 also ensures that the first recessed structure 46 and the second recessed structure 47 are symmetrically arranged with respect to the center of their respective end faces. This allows the first protruding structure 41 and the second protruding structure 42 to more accurately contact the tab (e.g., the second tab 7).

[0127] Furthermore, the through hole 50 of the core 5 is located at the center of the core 5. This arrangement allows the first protrusion structure 41 and the second protrusion structure 42 to be located within the through hole 50.

[0128] In one example, such as Figure 5 As shown, a double-needle welding head 9 is used to weld at the recessed structure corresponding to the positions of the first protruding structure 41 and the second protruding structure 42, with the two welding heads 9 corresponding one-to-one with the two recessed structures.

[0129] For example, during welding, the two welding heads 9 of the dual-needle welding head are arranged in parallel. One welding head 9 supports the first recessed structure 46, and the other welding head 9 supports the second recessed structure 47. Due to the arrangement of the first recessed structure 46 and the second recessed structure 47, the positioning of the dual-needle welding head 9 is more precise, and the welding accuracy between the electrode tab and the shell is higher.

[0130] Of course, the welding method is not limited to double-needle resistance welding. Laser welding can also be used. During laser welding, the welding head 9 is aligned with the first recessed structure 46 and the second recessed structure 47. After the welding ball penetrates the shell, the electrode melts, thereby connecting the first protruding structure 41 with the electrode and the second protruding structure 42 with the electrode.

[0131] In one example, such as Figures 7-8 As shown, the protruding structure is an annular protrusion 43, and an annular groove 45 is formed on the outer side of the first end face 11 or the second end face 21, opposite to the annular protrusion 43. For example, the annular protrusion 43 and the annular groove 45 are integrally formed by stamping or injection molding. The annular protrusion 43 and the annular groove 45 can be circular, elliptical, rectangular, etc. For example, the shapes of the annular protrusion 43 and the annular groove 45 match. For example, the cross-sections of both the annular protrusion 43 and the annular groove 45 are U-shaped or V-shaped. The annular groove 45 can mark the welding position from the outside of the housing.

[0132] The annular protrusion 43 increases the contact area between the electrode tab and the housing, making their positioning easier. The annular groove 45 provides a larger operating space and positioning area, which facilitates welding.

[0133] In one example, the portion of the first end face 11 or the second end face 21 located in the area surrounded by the annular protrusion 43 forms a central protrusion 44 with a protrusion direction opposite to that of the annular protrusion 43. The surface layer of the central protrusion 44 is tapered, which serves as a guide, allowing the central protrusion 44 to guide the welding head 9 to the bottom of the annular recess structure.

[0134] For example, a central groove is formed on the inner side of the first end face 11 and the second end face 21, and at a position opposite to the central protrusion 44. The central groove makes the annular protrusion 43 more reliably held against the tab.

[0135] In one example, such as Figure 7 As shown, at least two solder joints are formed on the annular protrusion 43. In this example, the solder joints are not continuous but intermittent. This avoids making the shape of the solder head 9 too complex, which would be detrimental to its fabrication. The intermittent solder joints can be welded using existing solder heads 9 without requiring a redesign. At least two solder joints result in a higher yield rate for the welding of the tab to the housing.

[0136] For example, the two solder joints are symmetrically arranged with respect to the center of the end face. This makes the connection between the electrode tab and the housing more efficient.

[0137] In one example, such as Figure 7 As shown, the electrode tab (e.g., the second electrode tab 7) is welded to the annular protrusion 43 using a double-needle welding head 9, which is applied within the annular groove 45.

[0138] For example, during welding, the two welding heads 9 abut against the bottom of the annular groove 45. Since the annular groove 45 has a larger operating space than a dot-shaped groove (e.g., the first recessed structure 4, 6, and the second recessed structure 47), welding can be achieved as long as the two welding heads 9 can enter the annular groove 45. In this way, even if the positions of the two welding heads 9 are offset, the operational reliability of the two-needle resistance welding can be guaranteed.

[0139] In one example, such as Figure 7 As shown, the width of the recessed structure gradually increases from the bottom to the opening. For example, the cross-section of the annular groove 45 is V-shaped. This makes it easier for the dual-needle welding head 9 to enter the annular groove 45, reducing the possibility of welding deviation and further improving the positioning accuracy of the dual-needle welding head 9.

[0140] Of course, welding methods are not limited to double-needle resistance welding; laser welding, ultrasonic welding, and other methods can also be used.

[0141] In one example, the protrusion 4 is located on the first end face 11 or the second end face 21 at a location opposite to the through hole 50 in the middle of the core 5. For example... Figure 4 , Figure 5 , Figure 7 As shown, the protruding structures 4 are all opposite to the through holes 50. Welding at this position can effectively prevent the weld points from damaging the core 5.

[0142] In one example, one tab is connected to the protrusion 4, and the other tab is electrically connected to the side wall of the housing. This connection can be made, for example, by resistance welding, laser welding, or ultrasonic welding. Resistance welding is as described previously. The tab connected to the side wall can be pressed against the side wall to achieve an electrical connection. This method also enables the electrical connection between the core 5 and the housing.

[0143] In a specific example, one of the two tabs is connected to the positive electrode of the winding core 5, and the other is connected to the negative electrode of the winding core 5. A protruding structure is provided on the second end face 21. One tab is connected to the protruding structure, and the other tab is connected to the first sidewall 12.

[0144] For example, such as Figures 9-10 As shown, the second electrode tab 7 is connected to the positive electrode of the winding core 5, and the first electrode tab 6 is connected to the negative electrode of the winding core 5. The first electrode tab 6 is connected to the first sidewall 12. For example, the connection is made by welding. The second electrode tab 7 is connected to a protruding structure (e.g., annular protrusion 43) on the second end face 21. For example, the connection is made by welding.

[0145] In this way, the length of the tab connected to the first sidewall 12 can be reduced, thereby reducing the resistance of the button cell.

[0146] Furthermore, the tab does not occupy axial space inside the casing, allowing the core 5 to be made larger. This results in a larger capacity for the coin cell.

[0147] In one example, the two tabs extend from the same end face of the core 5.

[0148] For example, such as Figure 9 As shown, both the first tab 6 and the second tab 7 extend from the lower end face of the core 5. The second tab 7 is welded to a raised structure (e.g., annular protrusion 43). The first tab 6 is bent toward the first sidewall 12 and welded to the first sidewall 12. Because the two tabs extend from the same end face of the core 5, the assembly of the button cell is facilitated.

[0149] During assembly, firstly, the first tab 6 is attached to the side wall of the core 5. Since the upper end face of the core 5 has no tab, this end face faces the first end face 11 and is placed inside the first half-shell. The first tab 6 contacts the first side wall 12. For example, the first tab 6 is welded to the first side wall 12 from the outside of the first half-shell using double-needle resistance welding (i.e., resistance welding with a double-needle welding head).

[0150] Then, the second half-shell is fitted over the first half-shell. The second tab 7 is located between the lower end face of the core 5 and the second end face 21.

[0151] Finally, the second tab 7 is welded to the second end face 21. For example, a double-needle resistance welder is used for welding.

[0152] Alternatively, one tab may extend from one end face of the core 5, and the other tab may extend from the other end face of the core 5. For example, as... Figure 10 As shown, the first tab 6 extends from the upper end face of the core 5, and the second tab 7 extends from the lower end face of the core 5.

[0153] During assembly, firstly, the first tab 6 is attached to the side wall of the core 5. The upper end face of the core 5 faces the first end face 11 and is placed inside the first half-shell. The first tab 6 contacts the first side wall 12. For example, the first tab 6 is welded to the first side wall 12 from the outside of the first half-shell using double-needle resistance welding (i.e., resistance welding with double-needle welding heads or parallel gap welding).

[0154] Then, the second half-shell is fitted over the first half-shell. The second tab 7 is located between the lower end face of the core 5 and the second end face 21.

[0155] Finally, the second tab 7 is welded to the second end face 21. For example, a double-needle resistance welder is used for welding.

[0156] Of course, the welding method is not limited to double-needle resistance welding and double-sided electrode spot welding; laser welding can also be used.

[0157] In one example, the first sidewall 12 includes a first portion 121 connected to the first end face 11 and a second portion 122 connected to the first portion 121, the second portion 122 protruding radially outward relative to the first portion 121, and a tab connected to the sidewall is connected to the second portion 122.

[0158] like Figures 9-10 As shown, after the first electrode is bent, it extends to the second portion 122. Because the second portion 122 protrudes radially outward relative to the first portion 121, the gap between the second portion 122 and the core 5 is large. This prevents heat damage to the core 5 during welding.

[0159] In addition, a heat-insulating layer is provided between the tab and the side wall of the battery core 5. The heat-insulating layer is made of materials such as plastic, rubber, silicone, or fiberglass. The heat-insulating layer further provides heat insulation and prevents damage to the battery core 5 during the welding process.

[0160] In one example, the second sidewall 22 is rolled inward at the junction of the first portion 121 and the second portion 122. For example... Figures 9-10 As shown, the open end of the second sidewall 22 is rolled inward at the connecting portion 123. The rolled edge can be partial or full. This method makes the connection between the first half-shell and the second half-shell more secure.

[0161] According to one embodiment of the present disclosure, an electronic device is provided, the electronic device including a button battery as described in any one of the embodiments of the present disclosure.

[0162] This electronic device has the technological advantages of a button battery.

[0163] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0164] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A button battery, characterized in that, include: A housing, the housing comprising a first half-shell and a second half-shell; The first half-shell includes a first end face and a first sidewall disposed around the first end face; The second half-shell includes a second end face and a second sidewall disposed around the second end face; The second sidewall is fitted over the outside of the first sidewall, and an insulating sealing ring is provided between the first sidewall and the second sidewall; The core is disposed inside the housing. The core has a wound structure. The two end faces of the core are respectively opposite to the first end face and the second end face. Two tabs are provided on the core. At least one of the first end face and the second end face is provided with a protruding structure and is connected to the corresponding electrode tab through the protruding structure, the protruding structure protruding towards the inside of the housing; The protrusion structure is an annular protrusion, and an annular groove is formed on the outer side of the first end face or the second end face and at a position opposite to the annular protrusion. The portion of the first end face or the second end face located in the area surrounded by the annular protrusion forms a central protrusion with a protrusion direction opposite to that of the annular protrusion, and the surface of the central protrusion is conical.

2. The button battery according to claim 1, characterized in that, The core has a through hole in the middle, and at least a portion of the protruding structure is located within the through hole.

3. The button battery according to claim 2, characterized in that, In the radial direction of the through hole, the size of the protrusion structure is less than or equal to the size of the through hole.

4. The button battery according to claim 1, characterized in that, The core has a through hole in the middle, and the projection of the protruding structure on the end face of the core at least partially covers the through hole.

5. The button battery according to claim 2, characterized in that, The protruding structure can be a spherical protrusion, an annular protrusion, a strip-shaped protrusion, a radial protrusion, or the top of the protruding structure can be a planar structure.

6. The button battery according to claim 2, characterized in that, A core post is disposed within the through hole, and the core post abuts against the electrode tab; or A core post is provided inside the through hole, and an axial cavity is provided inside the core post. The core post abuts against the electrode tab, and at least a portion of the protruding structure is located within the axial cavity.

7. The button battery according to claim 2, characterized in that, At least one of the tabs is connected to the inner wall of the through hole.

8. The button battery according to claim 1, characterized in that, The height of the protrusion protruding into the inner side of the housing is greater than or equal to 0.05 mm.

9. The button battery according to claim 1, characterized in that, The electrode tab is provided with a groove, and the protruding structure is provided in the groove, with the top of the protruding structure contacting the bottom of the groove.

10. The button battery according to claim 1, characterized in that, The electrode tab includes a first part and a second part connected to the first part. The first part is connected to the core. The second part of one electrode tab is located between the end face of the core and the first end face and is connected to the first end face. The second part of the other electrode tab is located between the end face of the core and the second end face and is connected to the second end face.

11. The button battery according to claim 1, characterized in that, The first end face is welded to the electrode tab or the second end face is welded to the electrode tab using a double-needle welding head.

12. The button battery according to claim 1, characterized in that, At least one of the first half-shell and the second half-shell is a one-piece molded structure.

13. The button battery according to claim 1, characterized in that, The first end face or the second end face is provided with a plurality of the protrusion structures.

14. The button battery according to claim 13, characterized in that, A recessed structure is provided on the outer side of the first end face or the second end face, and at a position corresponding to the plurality of protruding structures, and welding is applied from the recessed structure.

15. The button battery according to claim 14, characterized in that, The plurality of protrusion structures include a first protrusion structure and a second protrusion structure, wherein the first protrusion structure and the second protrusion structure are symmetrically arranged with respect to the center of the first end face or the center of the second end face.

16. The button battery according to claim 15, characterized in that, A double-needle welding head is used to weld at the recessed structure corresponding to the positions of the first protruding structure and the second protruding structure, with the two welding heads corresponding one-to-one with the two recessed structures.

17. The button cell battery according to any one of claims 1-12, characterized in that, A recessed structure is constructed on the outer side of the first end face or the second end face, at a position opposite to the protruding structure.

18. The button battery according to claim 1, characterized in that, At least two solder joints are formed on the annular protrusion.

19. The button battery according to claim 1, characterized in that, The electrode tab is welded to the annular protrusion using a double-needle welding head, which is applied within the annular groove.

20. The button battery according to claim 17, characterized in that, The width of the recessed structure gradually increases from the bottom of the recessed structure to the opening end.

21. The button battery according to claim 17, characterized in that, The protruding structure is located on the first end face or the second end face at a position opposite to the through hole in the middle of the core.

22. The button battery according to claim 1, characterized in that, One of the two tabs is connected to the positive electrode of the winding core, and the other is connected to the negative electrode of the winding core. A protruding structure is provided on the second end face, with one tab connected to the protruding structure and the other tab connected to the first sidewall.

23. The button battery according to claim 22, characterized in that, Both of the tabs extend from the same end face of the winding core; or One of the tabs extends from one end face of the core, and the other tab extends from the other end face of the core.

24. The button battery according to claim 22, characterized in that, The first sidewall includes a first portion connected to the first end face and a second portion connected to the first portion. The second portion protrudes radially outward relative to the first portion, and the tab connected to the sidewall is connected to the second portion.

25. The button battery according to claim 24, characterized in that, The second sidewall is rolled inward at the junction of the first part and the second part.

26. An electronic device, characterized in that, Including the button cell battery as described in any one of claims 1-25.

Images