Button cell
By using a button cell design with a columnar structure, the positive electrode is directly connected to the positive electrode shell, eliminating the need for high-temperature adhesive tape on the end face of the core and electrode tab welding. This solves the problems of low electrolyte permeability and cumbersome production, achieving efficient production and cost savings.
Patent Information
- Application Number
- CN202520242761.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-02-14
AI Technical Summary
The application of high-temperature adhesive tape to the end face of existing button cell cores affects electrolyte permeability, and the welding process of tabs to the end face of the cores is cumbersome, affecting production efficiency and cost.
The negative and positive electrode sheets are folded and wound into a cylindrical structure. The first end of the positive electrode sheet is provided with high-temperature protective adhesive and is directly connected to the positive electrode shell. The high-temperature adhesive paper on the end face of the core and the electrode tab welding are eliminated, and a conductive metal shell is used.
It improves electrolyte penetration, simplifies the production process, saves material costs, and reduces the internal resistance of button batteries.
Smart Images
Figure CN223757581U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technical field especially relates to a button cell. BACKGROUND
[0002] The button cell of the related art comprises a battery shell and a roll core arranged in the battery shell, the roll core generally comprises a negative plate, a diaphragm and a positive plate, the negative plate, the diaphragm and the positive plate form a columnar structure after being wound, and the axial two end faces of the roll core are pasted with high-temperature adhesive paper after winding, and the positive plate needs to be electrically connected with the battery shell after being welded with a positive lug, the process is relatively complicated, and the two end faces of the roll core pasted with high-temperature adhesive paper can easily affect the permeability of electrolyte. SUMMARY
[0003] The utility model solves the technical problem and provides a button cell.
[0004] The utility model adopts the technical scheme that constructs a button cell, including the shell and the roll core that sets up in the shell, the shell includes negative shell and positive shell that combine together, the roll core is columnar structure, the roll core includes negative plate, diaphragm and positive plate that fold and wind together successively.
[0005] The first end of the negative plate is mechanically and electrically connected and fixed with the negative shell, the first end of the positive plate has opposite first surface and second surface, the second surface of the first end of the positive plate is provided with high-temperature protective glue, the first end of the positive plate is bent and arranged, and the high-temperature protective glue is arranged towards the end face of the roll core, and the first surface of the first end of the positive plate is mechanically and electrically connected and fixed with the positive shell.
[0006] In some embodiments, the negative shell is cylindrical, and the negative shell comprises a top wall and an annular side wall connected to the periphery of the top wall.
[0007] The positive shell is cylindrical, and the positive shell comprises a bottom wall and an annular surrounding wall connected to the periphery of the bottom wall.
[0008] In some embodiments, the roll core has a first end face and a second end face, the first end of the negative plate extends out of the first end face of the roll core and is welded and fixed with the top wall, and the first end face of the roll core is provided with heat insulation paper.
[0009] In some embodiments, the first end of the negative plate is fixed with the top wall by laser welding or ultrasonic welding.
[0010] In some embodiments, the first surface of the first end of the positive electrode sheet is welded to the bottom wall.
[0011] In some embodiments, the first surface of the first end of the positive electrode sheet is fixed to the bottom wall by laser welding or ultrasonic welding.
[0012] In some embodiments, the insulating sealant covers the portion of the outer side of the annular side wall opposite to the annular surrounding wall, and the lower end of the annular side wall.
[0013] In some embodiments, the positive electrode sheet comprises a positive electrode current collector having opposite first and second ends, at least a portion of the surface of the positive electrode current collector is provided with a positive electrode active material layer, the positive electrode current collector comprises an aluminum foil, the positive electrode active material layer comprises a lithium cobalt oxide layer, the second surface of the first end of the positive electrode current collector is provided with a high-temperature protective adhesive, and the first surface of the first end of the positive electrode current collector is mechanically and electrically connected and fixed to the positive electrode shell.
[0014] In some embodiments, the negative electrode shell is a conductive metal shell.
[0015] In some embodiments, the positive electrode shell is a conductive metal shell.
[0016] The utility model discloses a button cell, which comprises a shell and a roll core arranged in the shell. The shell comprises a negative electrode shell and a positive electrode shell combined with each other. The roll core has a columnar structure and comprises a negative electrode sheet, a diaphragm and a positive electrode sheet folded and wound together in sequence. The first end of the negative electrode sheet is mechanically and electrically connected and fixed to the negative electrode shell. The first end of the positive electrode sheet has opposite first and second surfaces. The second surface of the first end of the positive electrode sheet is provided with a high-temperature protective adhesive. The first end of the positive electrode sheet is bent, and the high-temperature protective adhesive is arranged towards the end surface of the roll core. The first surface of the first end of the positive electrode sheet is mechanically and electrically connected and fixed to the positive electrode shell. The high-temperature protective adhesive is directly arranged on the positive electrode sheet, and no high-temperature protective adhesive needs to be arranged on the end surface of the roll core. Therefore, the permeability of electrolyte is improved, and the efficiency of liquid injection is improved. The positive electrode sheet does not need to be welded with a tab, and the material cost is saved. The positive electrode sheet is directly connected to the positive electrode shell, and the internal resistance of the button cell is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical scheme of the utility model, the utility model will be further described below in combination with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation on the scope. Other related drawings can also be obtained by those skilled in the art without creative labor. In the drawings:
[0018] Figure 1 is a structural schematic diagram of a button cell in some embodiments of the present application;
[0019] Figure 2 is a structural schematic diagram of a roll core when flattened in some embodiments of the present application;
[0020] Figure 3 is a schematic diagram of folding of a positive electrode sheet in some embodiments of the present application;
[0021] Figure 4 is a schematic diagram of a positive electrode sheet after folding but before slitting in some embodiments of the present application;
[0022] Figure 5 is a schematic diagram of bending of a first end of a positive electrode sheet in some embodiments of the present application. DETAILED DESCRIPTION
[0023] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or positional relationships shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the present technical solution, and cannot be understood as indicating that the devices or elements referred to must have a particular direction, therefore, it cannot be understood as a limitation on the present application.
[0024] It should also be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "setting" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there can be one or more intermediate elements. The terms "first", "second", "third" and the like are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features, therefore, the features with "first", "second", "third" and the like can explicitly or implicitly include one or more of the features. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0025] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, devices, circuits, and
[0026] Referring to Figures 1 to 5 The present application shows a button cell, which can be a semi-solid battery or a liquid battery, comprising a shell 10 and a winding core 20 arranged in the shell 10.
[0027] The winding core 20 can be placed in the shell 10 in the form of a spiral winding in some embodiments, and the central axis of the winding core 20 can coincide with the central axis of the shell 10.
[0028] The shell 10 comprises a negative shell 11 and a positive shell 12 combined with each other, and the winding core 20 has a columnar structure and comprises a negative plate 21, a separator 22 and a positive plate 23 folded and wound together in sequence. The first end of the negative plate 21 is mechanically and electrically connected and fixed to the negative shell 11, and preferably, the first end of the negative plate 21 is bent to be mechanically and electrically connected and fixed to the negative shell 11.
[0029] The first end of the positive plate 23 has opposite first and second surfaces, the second surface of the first end of the positive plate 23 is provided with a high-temperature protection glue 233, the first end of the negative plate 21 is bent, and the high-temperature protection glue 233 is arranged towards the end surface of the winding core 20, and the first surface of the first end of the positive plate 23 is mechanically and electrically connected and fixed to the positive shell 12. The high-temperature protection glue 233 can also be defined as high-temperature protection glue paper.
[0030] The high-temperature protection glue 233 is directly arranged on the positive plate 23, and there is no need to arrange high-temperature protection glue on the end surface of the winding core 20, which can improve the permeability of electrolyte and improve the injection efficiency. In addition, the positive plate 23 does not need to be welded with a positive lug, which can save material cost, and the direct connection of the positive plate 23 and the positive shell 12 can reduce the internal resistance of the button cell.
[0031] As Figure 1 shown, in some embodiments, the shell 10 can have a substantially oblate cylindrical shape, and the diameter size thereof is greater than the height size thereof. In some embodiments, the height of the shell 10 can be 0.1-0.9 times, for example, 0.3-0.6 times of the diameter thereof. The thickness of the shell 10 can be 0.1-1 mm, for example, 0.12-0.82 mm.
[0032] Further, the negative shell 11 is in a cylindrical shape, for example, a circular cylindrical shape, and includes a top wall 111 and an annular side wall 112 connected to a periphery of the top wall 111.
[0033] The positive shell 12 is in a cylindrical shape, for example, a circular cylindrical shape, and includes a bottom wall 121 and an annular surrounding wall 122 connected to a periphery of the bottom wall 121. An outer diameter of the negative shell 11 can be smaller than an inner diameter of the positive shell 12, and an outer side surface of the annular side wall 112 and an inner side surface of the annular surrounding wall 122 are sealingly connected together by the insulating sealant 13. Preferably, the insulating sealant 13 covers a portion of the outer side surface of the annular side wall 112 opposite to the annular surrounding wall 122, and the insulating sealant 13 covers a lower end portion of the annular side wall 112, so that the negative shell 11 is completely insulated from the positive shell 12.
[0034] In some embodiments, the negative shell 11 is an electrically conductive metal shell, for example, made of a laser-weldable metal material such as stainless steel, aluminum, iron, etc. In some embodiments, the positive shell 12 is an electrically conductive metal shell, for example, made of a laser-weldable metal material such as stainless steel, aluminum, iron, etc.
[0035] In some embodiments, the jelly-roll 20 has a first end surface 20a and a second end surface 20b, and a first end of the negative tab 21 extends out of the first end surface 20a of the jelly-roll 20 and is welded to the top wall 111, and the first end surface 20a of the jelly-roll 20 is provided with a heat insulation paper. The first end of the negative tab 21 is fixed to the top wall 111 by laser welding or ultrasonic welding. The negative tab 21 can include a negative current collector and a negative active material coated on the negative current collector. In some embodiments, the negative current collector can be an electrically conductive foil such as a copper foil, and the negative active material can include a conductive material (such as graphite), a conductive agent (such as acetylene black), a thickening agent (such as CMC), and a binder (such as SBR).
[0036] In some embodiments, a first surface (blank foil area) of the first end of the positive tab 23 is welded to the bottom wall 121. In some embodiments, the first surface of the first end of the positive tab 23 is fixed to the bottom wall 121 by laser welding or ultrasonic welding.
[0037] In some embodiments, the positive tab 23 includes a positive current collector 231 having opposite first and second ends, at least a portion of a surface of the positive current collector 231 is provided with a positive active material layer 232, the positive current collector 231 includes an aluminum foil, the positive active material layer 232 includes a lithium cobalt oxide layer, a second surface of the first end of the positive current collector 231 is provided with a high-temperature protective adhesive 233, and a first surface of the first end of the positive current collector 231 is mechanically and electrically connected and fixed to the positive shell 12.
[0038] AsFigure 3 and Figure 4 As shown, at least a portion of the surface of the positive electrode current collector 231 is coated with a positive electrode active material to form a positive electrode active material layer 232. Then, the portion of the positive electrode current collector 231 excluding the positive electrode active material layer 232 is folded once or multiple times. A high-temperature protective adhesive 233 is then applied to the surface of the outermost layer of the folded positive electrode current collector 231, with the high-temperature protective adhesive 233 aligned with the periphery of the surface of the outermost layer of the positive electrode current collector 231 (e.g., ...). Figure 5 As shown), the positive electrode sheet 23 is then slit into strips. Compared with the traditional production structure (coating - rollers - slitting - electrode tab welding - electrode tab adhesive application - winding - positive and negative electrode core application of high temperature protective adhesive), the processing technology of this positive electrode sheet 23 simplifies the production process and saves the company material and labor costs.
[0039] Preferably, the positive electrode active material layer 232 and the adjacent positive electrode current collector 231 can also be covered with high-temperature protective adhesive 233 to improve connection stability.
[0040] Then as Figure 5 As shown, the first end of the positive current collector 231 is angled so that the high-temperature protective adhesive 233 faces the second end face 20b of the core 20. The portion of the positive current collector 231 without the high-temperature protective adhesive 233 (the blank foil area) is welded and fixed to the positive electrode shell 12. Because the positive current collector 231 (or foil) is used as the electrode tab, the overall longitudinal space of the button battery is saved, which can improve the volumetric energy density of the finished button battery. At the same time, the direct connection between the foil and the positive electrode shell 12 reduces the internal resistance of the button battery. In addition, because the high-temperature protective adhesive 233 is applied to the positive electrode sheet 23 in advance, the need to apply protective adhesive separately to the core 20 can be eliminated, which is beneficial to the penetration of electrolyte and improves the electrolyte injection efficiency.
[0041] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.
Claims
1. A coin cell battery characterized by, The battery includes a shell (10) and a winding core (20) arranged in the shell (10), the shell (10) includes a negative shell (11) and a positive shell (12) combined with each other, and the winding core (20) has a columnar structure and includes a negative electrode sheet (21), a diaphragm (22) and a positive electrode sheet (23) folded and wound together in sequence. The first end of the negative electrode sheet (21) is mechanically and electrically connected and fixed to the negative shell (11), the first end of the positive electrode sheet (23) has opposite first and second surfaces, the second surface of the first end of the positive electrode sheet (23) is provided with high-temperature protection glue (233), the first end of the positive electrode sheet (23) is bent, and the high-temperature protection glue (233) is arranged towards the end surface of the winding core (20), and the first surface of the first end of the positive electrode sheet (23) is mechanically and electrically connected and fixed to the positive shell (12).
2. The button cell of claim 1, wherein, The negative shell (11) has a cylindrical shape, and includes a top wall (111) and an annular side wall (112) connected to the periphery of the top wall (111). The positive shell (12) has a cylindrical shape, and includes a bottom wall (121) and an annular surrounding wall (122) connected to the periphery of the bottom wall (121), and the outer side surface of the annular side wall (112) and the inner side surface of the annular surrounding wall (122) are sealed and combined together by an insulating sealing glue (13).
3. The button cell of claim 2, wherein, The winding core (20) has a first end surface (20a) and a second end surface (20b), the first end of the negative electrode sheet (21) extends out of the first end surface (20a) of the winding core (20) and is welded and fixed to the top wall (111), and the first end surface (20a) of the winding core (20) is provided with heat insulation glue paper.
4. The button cell of claim 3, wherein, The first end of the negative electrode sheet (21) is fixed to the top wall (111) by laser welding or ultrasonic welding.
5. The button cell of claim 2, wherein, The first surface of the first end of the positive electrode sheet (23) is welded and fixed to the bottom wall (121).
6. The button cell of claim 5, wherein, The first surface of the first end of the positive electrode sheet (23) is fixed to the bottom wall (121) by laser welding or ultrasonic welding.
7. The button cell of claim 2, wherein, The insulating sealing glue (13) covers the opposite part of the outer side surface of the annular side wall (112) and the annular surrounding wall (122), and covers the lower end of the annular side wall (112).
8. The button cell of claim 1, wherein, The positive electrode sheet (23) includes a positive electrode current collector (231) having opposite first and second ends, at least part of the surface of the positive electrode current collector (231) is provided with a positive electrode active material layer (232), the positive electrode current collector (231) includes an aluminum foil, the positive electrode active material layer (232) includes a lithium cobaltate layer, the second surface of the first end of the positive electrode current collector (231) is provided with high-temperature protection glue (233), and the first surface of the first end of the positive electrode current collector (231) is mechanically and electrically connected and fixed to the positive shell (12).
9. The button cell battery of any one of claims 1 to 8, wherein, The negative shell (11) is a conductive metal shell.
10. The button cell battery of any one of claims 1 to 8, wherein, The positive shell (12) is a conductive metal shell.