A button cell structure, a manufacturing method thereof and a button cell

Abstract

The application provides a button cell structure, a manufacturing method thereof and a button cell, wherein the button cell structure comprises a winding core formed by winding a laminated structure and having a hollow inner hole, the laminated structure comprises at least one positive electrode sheet, at least one negative electrode sheet and a separator separating the at least one positive electrode sheet and the at least one negative electrode sheet, and at least two ends of the winding core are provided with a separator bonding layer wrapping the winding core, which is used for fixing the positive electrode sheet and the negative electrode sheet. The application provides a button cell structure, a manufacturing method thereof and a button cell, which at least solve the technical problem that the positive electrode sheet and the negative electrode sheet are prone to shifting, avoid short circuit caused by the contact between the positive electrode sheet and the negative electrode sheet and the shell in the button cell, and improve the use safety of the button cell.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a button cell structure, a method for manufacturing the same, and a button cell. Background Technology

[0002] Button batteries have advantages such as stable discharge voltage, wide operating temperature range, and long storage life, and are widely used in various electronic products. The demand for button batteries is constantly increasing in wearable devices, such as wireless headphones, sports watches, wristbands, and rings.

[0003] Button batteries need improved safety for prolonged use in harsh environments, especially bumpy conditions. However, limited by industrial manufacturing capabilities and market demand, the market has previously been dominated by primary button batteries, with rechargeable lithium-ion button batteries virtually nonexistent. Furthermore, the miniaturization of electronic products places high demands on battery dimensions. The shrinking size and increased requirements for dimensional consistency in button batteries present significant manufacturing challenges. Button batteries with steel casings better meet these needs. Existing button battery cells are prone to displacement of the positive and negative electrodes in harsh environments, particularly bumpy conditions or drops, leading to short circuits due to contact with the metal casing and compromising safety.

[0004] Under such demand, we urgently need to provide a secondary hard-shell micro lithium-ion battery to meet the needs of a wide range of users. By improving the cell structure and manufacturing method of the button cell and the button cell itself, we can effectively solve the problem of easy displacement of the positive and negative electrode plates, and avoid short circuits caused by contact with the metal casing of the button cell. Summary of the Invention

[0005] This invention provides a button cell structure and manufacturing method, as well as a button cell, to at least solve the technical problem of the positive and negative electrodes easily shifting and displaced, avoid short circuits caused by the positive and negative electrodes contacting the outer casing of the button cell, and improve the safety of the button cell in use.

[0006] To achieve the above objectives, the present invention provides a button cell structure comprising a wound core formed by winding a laminated structure and having a hollow inner hole, wherein a first tab and a second tab are disposed on the wound core, the laminated structure comprising at least one positive electrode, at least one negative electrode, and a separator separating the at least one positive electrode and the at least one negative electrode, wherein at least two ends of the wound core are provided with a separator adhesive layer that wraps around the wound core, the separator adhesive layer being used to fix the positive electrode and the negative electrode.

[0007] In this invention, a separator adhesive layer is provided, which wraps around both ends of the wound core. This allows the separator adhesive layer to cover and enclose the positive and negative electrode sheets, enclosing them within a sealed area. This restricts the movement and displacement of the positive and negative electrode sheets. Even under severe vibration, such as running or falling, it ensures that the positive and negative electrode sheets will not detach from the wound core, preventing them from contacting the battery casing and causing a short circuit. This improves the safety of the button cell structure.

[0008] In one possible implementation, the diaphragm extends outward from both ends of the wound core to form protruding ends, and the protruding ends are inclined toward the inner hole of the wound core, and adjacent protruding ends are bonded together to form the diaphragm adhesive layer.

[0009] In one possible implementation, the width D of the protruding end is greater than or equal to the sum of the thickness of the negative electrode, the thickness of the positive electrode, and the thickness of the separator.

[0010] In one possible implementation, when the first tab is located on the outer ring of the wound core, the diaphragm is disposed on the outside of the positive electrode sheet / or the negative electrode sheet connected to the first tab;

[0011] The diaphragm adhesive layer includes a first diaphragm adhesive layer located inside the first electrode tab and a second diaphragm adhesive layer located outside the first electrode tab, wherein the adhesive force of the first diaphragm adhesive layer is greater than the adhesive force of the second diaphragm adhesive layer.

[0012] In one possible implementation, when the first tab is located on the inner ring of the wound core, the diaphragm is disposed on the inner side of the positive electrode sheet / or the negative electrode sheet connected to the first tab;

[0013] The diaphragm adhesive layer includes a second diaphragm adhesive layer located inside the first electrode tab and a first diaphragm adhesive layer located outside the first electrode tab, wherein the adhesive force of the first diaphragm adhesive layer is greater than the adhesive force of the second diaphragm adhesive layer.

[0014] In one possible implementation, the area of ​​the second diaphragm adhesive layer covering the first electrode tab is 5% to 30% of the area of ​​the first electrode tab.

[0015] In one possible implementation, before the diaphragm adhesive layer is formed, the width A of the diaphragm is 4 mm to 10 mm; after the diaphragm adhesive layer is formed, the width A2 of the diaphragm is 3 mm to 9 mm.

[0016] In one possible implementation, the width B of the positive electrode is 2 mm to 8 mm, and the width C of the negative electrode is 2.5 mm to 8.5 mm.

[0017] The present invention also provides a button battery, including the above-described button battery cell structure, and a housing, wherein the housing has a receiving cavity for accommodating the button battery cell structure, the bent portion of the first tab is located on at least one end face of the wound core, the bent portion of the first tab contacts the separator adhesive layer, and the bent portion of the first tab is electrically connected to the end face of the housing.

[0018] The present invention also provides a method for manufacturing a button cell structure, for manufacturing the above-mentioned button cell structure, comprising:

[0019] A wound core is provided, the wound core including a positive electrode sheet, a negative electrode sheet and a separator separating the positive electrode sheet and the negative electrode sheet;

[0020] Provides a first electrode and a second electrode;

[0021] Weld the first electrode tab and the second electrode tab;

[0022] Providing a heating plate and heating the heating plate to a preset temperature includes providing an arc-shaped heating plate and a first flat heating plate, and heating the arc-shaped heating plate and the first flat heating plate to the preset temperature, wherein the preset temperature is 122°C to 128°C;

[0023] The heating plate scrapes the diaphragms at both ends of the wound core from the outside to the inside, so that the protruding ends of the diaphragms form inclined protruding ends.

[0024] The heating plate hot-presses the inclined protruding end, so that the inclined protruding end forms a diaphragm adhesive layer that bonds and shrinks sequentially.

[0025] Scrape and press the first and second tabs so that they are pressed against the end face of the diaphragm adhesive layer;

[0026] The outermost / innermost diaphragm of the wound core is scraped and pressed to adhere it to the diaphragm adhesive layer.

[0027] This invention provides a method for manufacturing a button cell structure, which is used to manufacture the above-mentioned button cell structure. The manufacturing process is simple. In this invention, a hot pressing process is used to form a separator bonding layer at both ends of the wound core, which completely wraps the positive and negative electrode plates in a sealed area, which can significantly improve the safety of the button battery for long-term use in harsh environments, especially in bumpy environments.

[0028] This invention provides a method for manufacturing a button cell structure. By forming a separator bonding layer that completely encapsulates the positive and negative electrode plates, the positive and negative electrode plates are completely isolated from the button cell casing, preventing them from shifting and contacting the casing, thus avoiding short circuits. The button cell structure, manufacturing method, and button cell provided by this invention facilitate button cell manufacturing. Furthermore, button cells manufactured using the button cell structure provided by this invention effectively improve safety, remaining functional even in bumpy environments, and have a wide range of applications.

[0029] In addition to the technical problems solved by the embodiments of the present invention described above, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, the button cell structure and manufacturing method of the present invention, other technical problems that the button cell can solve, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific embodiments. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the structure of the button battery cell structure manufacturing method provided in the embodiment of the present invention, in which the first tab and the second tab are both located in the inner ring of the wound core, and the wound core is extruded by an arc heating plate;

[0032] Figure 2 This is a schematic diagram of the structure of the button battery cell manufacturing method provided in the embodiment of the present invention, in which the first tab and the second tab are both located in the inner ring of the wound core, and the wound core is extruded by the first planar heating plate.

[0033] Figure 3 This is a schematic diagram of the structure of the button battery cell manufacturing method provided in the embodiment of the present invention, in which the first tab and the second tab are both located on the outer ring of the wound core, and the first planar heating plate is used to extrude the wound core.

[0034] Figure 4 This is a schematic diagram of the structure of the button battery cell manufacturing method provided in the embodiment of the present invention, in which the first tab and the second tab are both located on the outer ring of the wound core, and the second planar heating plate is used to hot press the wound core.

[0035] Figure 5 A schematic diagram of the structure of the button battery cell structure manufacturing method provided in the embodiment of the present invention, in which the first tab and the second tab are both located in the inner ring of the wound core, and the wound core is extruded by the second planar heating plate.

[0036] Figure 6 This is a schematic diagram of the button cell structure before hot pressing, provided in an embodiment of the present invention.

[0037] Figure 7 This is a schematic diagram of the button cell structure provided in an embodiment of the present invention;

[0038] Figure 8 This is a partial structural diagram of the button cell structure before the separator is scraped, provided in an embodiment of the present invention.

[0039] Figure 9 This is a partial structural diagram of the button cell structure after the separator has been scraped, provided in an embodiment of the present invention.

[0040] Figure 10 This is a partial structural diagram of the button cell structure after the separator bonding layer is formed, as provided in an embodiment of the present invention.

[0041] Figure 11 This is a schematic diagram of the structure of the button battery cell mounting casing provided in an embodiment of the present invention;

[0042] Figure 12 A flowchart illustrating a method for manufacturing a button cell structure according to an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 10 - Winding core;

[0045] 11-Positive electrode plate;

[0046] 12-Negative electrode;

[0047] 13-September;

[0048] 131 - Protruding end;

[0049] 132 - Diaphragm adhesive layer;

[0050] 14-inner hole;

[0051] 20 - First pole ear;

[0052] 21-Bending section;

[0053] 30 - Second pole ear;

[0054] 40 - Heating plate;

[0055] 41-Arc-shaped heating plate;

[0056] 42 - First flat heating plate;

[0057] 43 - Second flat heating plate;

[0058] 50 - Outer shell;

[0059] 51-Receiving cavity. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0061] In daily life, we find that button batteries are widely used in many ultra-thin and compact electronic products, such as weighing scales, electronic watches, and wireless headphones. Button batteries are characterized by their small size and low discharge current, making them the preferred power source for many electronic products and contributing to the miniaturization of electronic products.

[0062] The cell structure is the core component of a button cell. There are two main manufacturing processes for button cell structures. One is the stacking process, which involves cutting the positive electrode, negative electrode, and separator into the specific shapes and sizes required for production, and then stacking them together to form the main body of the cell. The other is the winding process, which involves placing the separator between the positive and negative electrode sheets, and then winding the positive electrode, negative electrode, and separator together to form the main body of the cell.

[0063] The lamination process requires cutting the positive electrode, negative electrode, and separator into specific shapes and sizes needed for production. This process is complex and requires more production time. In contrast, the winding process is simpler, requiring only the positive electrode, negative electrode, and separator to be arranged into strips of a specific size and shape. It is simpler, faster, and easier to automate. Therefore, most button cell structures use the winding process.

[0064] However, existing button batteries are prone to displacement of the positive and negative electrodes in harsh environments, especially bumpy environments or drops, which can cause them to come into contact with the metal casing and cause a short circuit, affecting the safety of use.

[0065] In view of the above background, the present invention provides a button cell structure, a manufacturing method thereof, and a button cell, which improves the button cell structure, manufacturing method thereof, and button cell, and avoids the phenomenon of positive and negative electrode plates shifting and displacing when the button cell is subjected to bumpy environment or drop, thereby avoiding short circuits and improving service life and safety of use.

[0066] refer to Figure 7 and Figure 8 As shown, a button cell structure includes a wound core 10 formed by winding a laminated structure and having a hollow inner hole 14. The laminated structure includes at least one positive electrode 11, at least one negative electrode 12, and a separator 13 separating the at least one positive electrode 11 and the at least one negative electrode 12. At least two ends of the wound core 10 are provided with separator adhesive layers 132 that wrap around the wound core 10. The separator adhesive layers 132 are used to fix the positive electrode 11 and the negative electrode 12. The separator adhesive layers 132 ensure that the positive electrode 11 and the negative electrode 12 are stably wrapped in a sealed area, preventing the positive electrode 11 and the negative electrode 12 from shifting and contacting the battery casing 50 when the button cell is subjected to severe vibrations such as drops, thus preventing short circuits and improving safety during use.

[0067] The inner hole 14 is located at the center of the winding core 10, and the inner hole 14 passes through both ends of the winding core 10.

[0068] refer to Figure 6 and Figure 8 As shown, the diaphragm 13 extends outward from both ends of the wound core 10 to form protruding ends 131, as shown in the reference diagram. Figure 9 and Figure 10 As shown, the protruding end 131 is inclined toward the inner hole 14 of the winding core 10, and adjacent protruding ends 131 are bonded together to form a diaphragm adhesive layer 132.

[0069] It is easy to understand that the two sides of the diaphragm 13 extend outward from both ends of the winding core 10, that is, the diaphragm 13 extends along the axial direction of the winding core 10 from both ends of the winding core 10 in a direction away from the winding core 10.

[0070] Specifically, in the stacked structure, the width of the separator 13 is greater than the width of each positive electrode 11, and the width of the separator 13 is also greater than the width of each negative electrode 12. This results in the separator 13 being left unused at both ends of the stacked structure after it is wound along the length of the separator 13 to form the wound core 10. The unused separator 13 is the protruding end 131.

[0071] refer to Figure 6 and Figure 8As shown, the wound core 10 can be formed by a stacked structure of a positive electrode 11, a separator 13, a negative electrode 12, and another separator 13 arranged sequentially from top to bottom or from bottom to top, and then formed by a winding process; the wound core 10 can also be formed by a stacked structure of a negative electrode 12, a separator 13, a positive electrode 11, and another separator 13 arranged sequentially from top to bottom or from bottom to top, and then formed by a winding process.

[0072] Of course, the laminated structure can also be composed of multiple negative electrode plates 12 and multiple positive electrode plates 11 stacked alternately in sequence, with separators 13 provided on the upper and lower sides of each negative electrode plate 12 / or each positive electrode plate 11 to completely separate each negative electrode plate 12 from each positive electrode plate 11. The laminated structure is then formed into a wound core 10 through a winding process. Even after the wound core 10 is wound, it must be ensured that the negative electrode plate 12 does not come into contact with the positive electrode plate 11 to avoid short circuits.

[0073] The separator 13 is used to prevent short circuits caused by contact between the negative electrode 12 and the positive electrode 11. The separator 13 only needs to ensure that each negative electrode 12 and each positive electrode 11 are completely separated and do not come into contact. The separator 13 is not limited to being disposed between each negative electrode 12 and each positive electrode 11. It can also be wrapped around each negative electrode 12 or each positive electrode 11 to completely separate each negative electrode 12 and each positive electrode 11.

[0074] A separator 13 is located on the outer and inner sides of at least one positive electrode 11 and / or on the outer and inner sides of at least one negative electrode 12, so that each positive electrode 11 is completely separated from each negative electrode 12. That is, the separator 13 is located on the outer and inner sides of at least one positive electrode 11, so that each positive electrode 11 is completely separated from each negative electrode 12. Alternatively, the separator 13 is located on the outer and inner sides of at least one negative electrode 12, so that each positive electrode 11 is completely separated from each negative electrode 12.

[0075] refer to Figure 6 As shown, the winding core 10 is spirally wound, thus having obvious spiral rings at both ends of the winding core 10. The protruding end 131 of each ring of diaphragm 13 is inclined toward the inner hole 14 of the winding core 10 and is bonded to the protruding end 131 of the diaphragm 13 of the adjacent inner ring.

[0076] refer to Figure 10 As shown, the protruding end 131 of each ring of separator 13 partially overlaps with the protruding end 131 of the adjacent inner ring of separator 13. Therefore, in order to ensure that the protruding end 131 of each ring of separator 13 partially overlaps with the protruding end 131 of the adjacent inner ring of separator 13, the width D of the protruding end 131 needs to satisfy that D is greater than / or equal to the sum of the thickness of the positive electrode 11, the thickness of the negative electrode 12, and the thickness of the separator 13.

[0077] refer to Figure 6 and Figure 7 As shown, a first electrode tab 20 and a second electrode tab 30 are respectively provided at both ends of the wound core 10. One of the first electrode tab 20 and the second electrode tab 30 is a positive electrode tab, and the other of the first electrode tab 20 and the second electrode tab 30 is a negative electrode tab. The positive electrode tab is connected to the positive electrode plate 11, and the negative electrode tab is connected to the negative electrode plate 12.

[0078] refer to Figure 6 and Figure 7 As shown, when the first tab 20 is located on the outer ring of the winding core 10, the second tab 30 is also located on the outer ring of the winding core 10. One of the first tab 20 and the second tab 30 is connected to the upper end of the winding core 10, and the other is connected to the lower end of the winding core 10. The first tab 20 being located on the outer ring of the winding core 10 means that the connection position of the first tab 20 and its connected positive electrode 11 / or negative electrode 12 is located in the outer ring of the winding core 10. "Outer" refers to the portion of the winding core close to the button cell casing 50.

[0079] refer to Figure 6 and Figure 7 As shown, when the first tab 20 is located on the outer ring of the wound core 10, a diaphragm 13 is provided on the outer side of the positive electrode 11 / or negative electrode 12 connected to the first tab 20; the diaphragm adhesive layer 132 includes a first diaphragm adhesive layer located inside the first tab 20 and a second diaphragm adhesive layer located outside the first tab 20, and the adhesive force of the first diaphragm adhesive layer is greater than the adhesive force of the second diaphragm adhesive layer; a diaphragm 13 is provided on the outer side of the positive electrode 11 / or negative electrode 12 connected to the second tab 30; the diaphragm adhesive layer 132 includes a first diaphragm adhesive layer located inside the second tab 30 and a second diaphragm adhesive layer located outside the second tab 30, and the adhesive force of the first diaphragm adhesive layer is greater than the adhesive force of the second diaphragm adhesive layer. When processing the first diaphragm adhesive layer, a heating plate 40 is used to scrape the protruding ends 131 of the diaphragms 13 at both ends of the wound core 10 from the edge of the wound core 10 toward the inner hole 14 in the center of the wound core 10. Except for the layer of diaphragms 13 arranged on the outer ring of the positive electrode 11 / or negative electrode 12 connected to the first electrode tab 20 and the second electrode tab 30, the protruding ends 131 of the diaphragms 13 arranged on the inner ring of the other positive electrode 11 / or negative electrode 12 are scraped toward the inner hole 14 in the center of the wound core 10, so that the protruding ends 131 of the diaphragms 13 are tilted. Then, by planar hot pressing, the tilted protruding ends 131 at both ends of the wound core 10 are bonded and contracted to form the first diaphragm adhesive layer. Moreover, the adhesive force of the first diaphragm adhesive layer is greater than that of the second diaphragm adhesive layer.

[0080] Here, adhesive force refers to the force required to separate the membrane adhesive layer 132 after it has been formed. The greater the adhesive force, the greater the force required to separate the membrane adhesive layer 132.

[0081] As another implementation of this embodiment, refer to Figure 1 and Figure 2 As shown, when the first tab 20 is located on the inner ring of the winding core 10, the second tab 30 is located on the inner ring of the winding core 10, and one of the first tab 20 and the second tab 30 is connected to the upper end of the winding core 10, while the other of the first tab 20 and the second tab 30 is connected to the lower end of the winding core 10.

[0082] refer to Figure 1 and Figure 2 As shown, when the first tab 20 is located on the inner ring of the wound core 10, a diaphragm 13 is provided on the inner side of the positive electrode 11 / or negative electrode 12 connected to the first tab 20; the diaphragm adhesive layer 132 includes a second diaphragm adhesive layer located on the inner side of the first tab 20 and a first diaphragm adhesive layer located on the outer side of the first tab 20, and the adhesive force of the first diaphragm adhesive layer is greater than the adhesive force of the second diaphragm adhesive layer; the second tab 30 is located on the inner ring of the wound core 10, and a diaphragm 13 is provided on the inner side of the positive electrode 11 / or negative electrode 12 connected to the second tab 30; the diaphragm adhesive layer 132 includes a second diaphragm adhesive layer located on the inner side of the second tab 30 and a first diaphragm adhesive layer located on the outer side of the second tab 30, and the adhesive force of the first diaphragm adhesive layer is greater than the adhesive force of the second diaphragm adhesive layer. When processing the first diaphragm adhesive layer, a heating plate 40 is used to scrape the protruding ends 131 of the diaphragms 13 at both ends of the wound core 10 from the edge of the wound core 10 toward the inner hole 14 in the center of the wound core 10. Except for the layer of diaphragms 13 arranged on the inner ring of the positive electrode 11 / or negative electrode 12 connected to the first electrode tab 20 and the second electrode tab 30, the protruding ends 131 of the diaphragms 13 on the outer ring of the other positive electrode 11 / or negative electrode 12 are scraped toward the inner hole 14 in the center of the wound core 10, so that the protruding ends 131 of the diaphragms 13 are tilted. Then, by planar hot pressing, the tilted protruding ends 131 at both ends of the wound core 10 are bonded and contracted to form the first diaphragm adhesive layer. The adhesive force of the first diaphragm adhesive layer is less than that of the second diaphragm adhesive layer. The first tab 20 is located in the inner ring of the winding core 10, which means that the connection position of the first tab 20 and the positive electrode 11 / or negative electrode 12 connected to it is located in the inner ring of the winding core 10. The inner ring refers to the part of the winding core near the inner hole 14.

[0083] refer to Figure 11As shown, after hot pressing, the first tab 20 and the second tab 30 are scraped and pressed so that the first tab 20 and the second tab 30 are on the end face of the diaphragm adhesive layer 132, and the outermost diaphragm 13 is scraped and pressed. The adhesive force between the outermost diaphragm 13 and the second outermost diaphragm 13 is less than the adhesive force between the other diaphragms 13.

[0084] Specifically, when the first tab 20 is located on the outer ring of the winding core 10, the second tab 30 is located on the inner ring of the winding core 10, and one of the first tab 20 and the second tab 30 is connected to the upper end of the winding core 10, while the other of the first tab 20 and the second tab 30 is connected to the lower end of the winding core 10. A diaphragm 13 is provided on the outer side of the positive electrode 11 / or negative electrode 12 connected to the first tab 20 and on the inner side of the positive electrode 11 / or negative electrode 12 connected to the second tab 30. At this time, the diaphragm adhesive layer 132 includes a first diaphragm adhesive layer located inside the first tab 20, a first diaphragm adhesive layer located outside the second tab 30, a second diaphragm adhesive layer located outside the first tab 20, and a second diaphragm adhesive layer located inside the second tab 30, and the adhesive force of the first diaphragm adhesive layer is greater than that of the second diaphragm adhesive layer.

[0085] The area covered by the second diaphragm adhesive layer of the first electrode 20 is 5% to 30% of the area of ​​the first electrode 20; the area covered by the second diaphragm adhesive layer of the second electrode 30 is 5% to 30% of the area of ​​the second electrode 30.

[0086] The button cell structure provided by the present invention is installed into the casing 50 for encapsulation. The wound core 10 is connected to the metal casing 50 of the button cell through the negative electrode tab, and the wound core 10 is connected to the metal casing 50 of the button cell through the positive electrode tab.

[0087] In this embodiment, reference Figure 8 and Figure 9 As shown, before the formation of the membrane bonding layer 132, the width A of the membrane 13 is between 4 mm and 10 mm; after the formation of the membrane bonding layer 132, the width A2 of the membrane 13 is between 3 mm and 9 mm. The width B of the positive electrode 11 is between 2 mm and 8 mm, and the width C of the negative electrode 12 is between 2.5 mm and 8.5 mm.

[0088] In this embodiment, the separator 13 can be a macroporous oil-based separator with a 5+2+2μm diameter and a melting point of 125°C. The substrate of the positive electrode 11 can be an aluminum foil with a thickness of 10μm, and a coating with a thickness of 75μm is applied to both sides of the substrate. The substrate of the negative electrode 12 can be a copper foil with a thickness of 5μm, and a coating with a thickness of 85μm is applied to both sides of the substrate.

[0089] Preferably, the diameter of the wound core 10 is 10 mm and the width is 5.5 mm, the width A of the separator 13 is 5.5 mm, the width C of the negative electrode 12 is 4 mm, and the width B of the positive electrode 11 is 3.5 mm.

[0090] refer to Figure 11 As shown, the present invention also provides a button battery, including the above-mentioned button battery cell structure, and further including a housing 50. The housing 50 has a receiving cavity 51 for accommodating the button battery cell structure. A cover is provided on the housing 50 to seal the receiving cavity 51. The housing 50 is used to encapsulate the button battery cell structure therein and protect the button battery cell structure.

[0091] One end of the first tab 20 is connected to the positive electrode 11 / or the negative electrode 12. The middle portion of the first tab 20 is bent to form a bent portion 21 that is nearly parallel to the end face of the wound core 10. The bent portion 21 extends to the other end of the first tab 20. The bent portion 21 of the first tab 20 is located on at least one end face of the wound core 10. The bent portion 21 of the first tab 20 contacts the diaphragm adhesive layer 132 and is electrically connected to the end face of the outer casing 50.

[0092] Specifically, one side of the bent portion 21 contacts the first diaphragm adhesive layer of the diaphragm adhesive layer 132, and the other side of the bent portion 21 of the first electrode 20 is electrically connected to the end face of the outer casing 50 through contact.

[0093] Because the protruding end 131 of the separator 13 in the existing wound core 10 is loose and has low strength, it cannot provide good insulation. Therefore, it is necessary to apply insulating tape to the end face of the existing wound core 10 to insulate the first tab 20 from the two end faces of the wound core 10. However, in the button battery provided in this application, the end face of the wound core 10 has a separator adhesive layer 132 that wraps around the wound core 10. The separator adhesive layer 132 tightly wraps the wound core 10 and insulates the first tab 20 from the two end faces of the wound core 10. Therefore, the first tab 20 can be directly bent to contact the separator adhesive layer 132, eliminating the need for insulating tape and simplifying the structure of the button battery.

[0094] This invention also provides a method for manufacturing a button cell structure, see reference. Figure 12 As shown, the manufacturing process for the above-described button cell structure includes the following steps:

[0095] Step S110: Provide a wound core 10, the wound core 10 including a positive electrode 11, a negative electrode 12, and a separator 13 separating the positive electrode 11 and the negative electrode 12, refer to Figure 8 The diagram shown is a partial cross-sectional view of the provided winding core 10.

[0096] Step S120: Provide a first electrode 20 and a second electrode 30, one of the first electrode 20 and the second electrode 30 being a positive electrode, and the other of the first electrode 20 and the second electrode 30 being a negative electrode;

[0097] Step S130: Weld the first electrode tab 20 and the second electrode tab 30, the positive electrode tab of the first electrode tab 20 and the second electrode tab 30 is connected to the positive electrode plate 11, and the negative electrode tab of the first electrode tab 20 and the second electrode tab 30 is connected to the negative electrode plate 12;

[0098] Step S140: Provide heating plate 40 and heat heating plate 40 to a preset temperature;

[0099] Step S150: The heating plate 40 scrapes the diaphragm 13 at both ends of the wound core 10 from the outside to the inside, so that the protruding end 131 of the diaphragm 13 forms an inclined protruding end 131.

[0100] Step S160: The heating plate 40 hot-presses the inclined protruding end 131, so that the inclined protruding end 131 forms a diaphragm adhesive layer 132 that is bonded and shrinks in sequence. Specifically, the inclined protruding end 131 forms a first diaphragm adhesive layer that is bonded and shrinks in sequence.

[0101] Step S170: Scrape and press the first tab 20 and the second tab 30 so that they are pressed against the end face of the diaphragm adhesive layer 132; specifically, scrape and press the first tab 20 and the second tab 30 so that they are pressed against the first diaphragm adhesive layer of the diaphragm adhesive layer 132.

[0102] Step S180: Scrape and press the outermost / innermost diaphragm 13 of the wound core 10 to bond it to the diaphragm adhesive layer 132. Specifically, scrape and press the outermost / innermost diaphragm 13 of the wound core 10 to bond it to the diaphragm adhesive layer 132 to form a second diaphragm adhesive layer.

[0103] The present invention provides a method for manufacturing a button cell structure. The manufacturing process is simple and can be mass-produced. The manufactured button cell structure has good safety. In this invention, a hot-pressing process is used to form a separator adhesive layer 132 at both ends of the winding core 10, which completely wraps the positive electrode 11 and the negative electrode 12 in a sealed area. This effectively prevents the positive electrode 11 and the negative electrode 12 from shifting and contacting the button cell casing 50, avoids short circuits, improves the service life of the button cell, and ensures stable use even in bumpy environments, thus improving safety.

[0104] In step S140, a heating plate 40 is provided, and the heating plate 40 is heated to a preset temperature, including:

[0105] An arc-shaped heating plate 41, a first flat heating plate 42, and a second flat heating plate 43 are provided, and the arc-shaped heating plate 41, the first flat heating plate 42, and the second flat heating plate 43 are heated to a preset temperature, which is 100℃~150℃.

[0106] Preferably, the preset temperature is 122℃~128℃.

[0107] The arc of the arc-shaped heating plate 41 is 30 rad to 60 rad.

[0108] The arc-shaped heating plate 41, the first flat heating plate 42, and the second flat heating plate 43 are all made of thermally conductive materials, including but not limited to metal materials such as copper. The surface of the metal material is coated with heat-insulating materials, including but not limited to ceramic materials.

[0109] Preferably, the arc-shaped heating plate 41, the first flat heating plate 42, and the second flat heating plate 43 are all made of copper, and the parts of the arc-shaped heating plate 41, the first flat heating plate 42, and the second flat heating plate 43 that come into contact with the diaphragm 13 are all plated with ceramic with a thickness of 20μm.

[0110] In step S150, refer to Figure 9 The diagram shown is a partial cross-sectional view of the wound core 10 after step S150. The heating plate 40 scrapes the diaphragms 13 at both ends of the wound core 10 from the outside to the inside, so that the protruding ends 131 of the diaphragms 13 form inclined protruding ends 131, including:

[0111] refer to Figure 2 and Figure 3 As shown, the pressing height of the two pairs of first planar heating plates 42 is controlled, and the scrapers of the two pairs of first planar heating plates 42 extend to a preset depth position inside the protruding end 131 of the diaphragm 13.

[0112] The scraper of the first planar heating plate 42 moves toward the inner hole 14 at the center of the winding core 10 and laterally presses the protruding end 131, causing the protruding end 131 to tilt toward the inner hole 14 at the center of the winding core 10, so that the width A1 of the diaphragm 13 reaches the required value in this embodiment, i.e., 5 mm; or

[0113] refer to Figure 1 As shown, the downward pressure height of the two pairs of arc-shaped heating plates 41 is controlled, and the scrapers of the two pairs of arc-shaped heating plates 41 extend to a preset depth position inside the protruding end 131 of the diaphragm 13.

[0114] The scraper of the arc-shaped heating plate 41 moves toward the inner hole 14 at the center of the winding core 10 and arc-shaped presses the protruding end 131, causing the protruding end 131 to tilt toward the inner hole 14 at the center of the winding core 10, so that the width A1 of the diaphragm 13 reaches the value required in this embodiment, namely 5mm.

[0115] exist Figure 1 In the diagram, the direction indicated by the straight arrow represents the direction in which the scraper of the arc-shaped heating plate 41 scrapes the protruding end 131 of the diaphragm 13. Figure 2 and Figure 3 In the diagram, the direction indicated by the straight arrow represents the direction in which the scraper of the first planar heating plate 42 scrapes the protruding end 131 of the diaphragm 13.

[0116] In this embodiment, reference Figure 2 As shown, the first tab 20 and the second tab 30 are located on the inner ring of the winding core 10, and the heating plate 40 is two pairs of first flat heating plates 42. The initial positions of the two pairs of first flat heating plates 42 are located on both ends of the winding core 10. The scrapers of the two pairs of first flat heating plates 42 extend to a preset depth position inside the protruding end 131 of the diaphragm 13. The two pairs of first flat heating plates 42 move relative to each other, so that the scrapers of the first flat heating plates 42 move toward the inner hole 14 in the center of the winding core 10 and laterally press the protruding end 131, so that the protruding end 131 tilts toward the inner hole 14 in the center of the winding core 10.

[0117] In another embodiment of this example, reference is made to... Figure 1 As shown, the first tab 20 and the second tab 30 are located on the inner ring of the winding core 10, respectively. The heating plate 40 used consists of two pairs of arc-shaped heating plates 41, and the initial positions of the two pairs of arc-shaped heating plates 41 are located on the outer sides of the two end faces of the winding core 10. The scrapers of the two pairs of arc-shaped heating plates 41 extend to a preset depth position inside the protruding end 131 of the diaphragm 13. The two pairs of arc-shaped heating plates 41 move relative to each other, causing the scrapers of the two pairs of arc-shaped heating plates 41 to move towards the center position of the winding core 10, and the arc-shaped extruding end 131 tilts towards the center position of the winding core 10.

[0118] As another embodiment of this example, refer to Figure 3 As shown, the first tab 20 and the second tab 30 are located on the outer ring of the winding core 10, respectively. The heating plate 40 adopts two pairs of first planar heating plates 42. The initial positions of the two pairs of first planar heating plates 42 are located at the two end faces of the winding core 10, respectively. The two pairs of first planar heating plates 42 move relative to each other, and the scrapers of the two pairs of first planar heating plates 42 extend to a preset depth position in the protruding end 131 of the diaphragm 13. The scrapers of the two pairs of first planar heating plates 42 laterally squeeze the protruding end 131, causing the protruding end 131 to tilt towards the inner hole 14 in the center of the winding core 10.

[0119] Specifically, the scraper of the first flat heating plate 42 and the scraper of the arc-shaped heating plate 41 are both 20mm long and 1mm wide, and both have a 45° chamfer on their end faces.

[0120] In step S160: Refer to Figure 10 The diagram shown is a partial cross-sectional view of the wound core 10 after step S160. The heating plate 40 hot-presses the inclined protruding end 131, causing the inclined protruding end 131 to form a diaphragm adhesive layer 132 that bonds and shrinks sequentially, including:

[0121] exist Figure 4 and Figure 5 In the diagram, the direction indicated by the straight arrow represents the direction of the compression by the second planar heating plate 43. (Reference) Figure 4 and Figure 5 As shown, the inclined protruding end 131 is hot-pressed by the second planar heating plate 43, so that the adjacent protruding ends 131 stick together and shrink to form a membrane adhesive layer 132 that completely wraps the positive electrode 11 and the negative electrode 12.

[0122] Specifically, see reference Figure 4 As shown, the first tab 20 and the second tab 30 are located on the outer ring of the wound core 10, respectively. The inclined protruding ends 131 are hot-pressed by a pair of second planar heating plates 43. In this case, the pair of second planar heating plates 43 can adopt a solid circular structure. The pair of second planar heating plates 43 move towards each other, so that the adjacent protruding ends 131 stick together and shrink, forming a membrane adhesive layer 132 that completely wraps the positive electrode 11 and the negative electrode 12.

[0123] refer to Figure 5 As shown, the first tab 20 and the second tab 30 are located in the inner ring of the wound core 10, respectively. The inclined protruding ends 131 are hot-pressed by a pair of second planar heating plates 43. In this case, the pair of second planar heating plates 43 can adopt a circular structure with a central opening. The pair of second planar heating plates 43 move towards each other, so that the adjacent protruding ends 131 stick together and shrink, forming a membrane adhesive layer 132 that completely wraps the positive electrode 11 and the negative electrode 12.

[0124] The second planar heating plate 43 adopts a circular structure with a diameter of 11mm.

[0125] In this embodiment, by controlling the temperature and pressing height of the second planar heating plate 43, the width A2 of the separator 13 is made to reach the preset value of 4.5mm in this embodiment, so that the adjacent protruding ends 131 stick together and shrink to form a sealed space, and the positive electrode 11 and the negative electrode 12 are completely covered by the separator 13. Within the sealed area formed by the separator 13, the positive electrode 11 and the negative electrode 12 will not come into contact with the battery casing 50 or other objects no matter how they move, thereby avoiding the risk of short circuit caused by the positive electrode 11 and the negative electrode 12 coming into contact with the metal casing 50 after misalignment in harsh environments, especially bumpy environments, greatly improving the safety of the button battery cell structure.

[0126] In step S180, scraping and pressing the outermost ring / or the outermost ring of the diaphragm 13 of the wound core 10 to bond it to the diaphragm adhesive layer 132 includes:

[0127] When the first tab 20 and the second tab 30 are respectively located on the outer ring of the winding core 10, the heating plate used is a pair of first flat heating plates 42, which scrape and press the outermost diaphragm of the winding core 10, so that the outermost diaphragm of the winding core 10 is bonded to the diaphragm bonding layer 132, thereby improving the sealing performance of the diaphragm bonding layer 132.

[0128] When the first tab 20 and the second tab 30 are located in the inner ring of the winding core 10, the heating plate 40 used is two pairs of arc-shaped heating plates 41 or a pair of first flat heating plates 42, which scrape and press the innermost diaphragm of the winding core 10, so that the outermost diaphragm of the winding core 10 is bonded to the diaphragm bonding layer 132, thereby improving the sealing performance of the diaphragm bonding layer 132.

[0129] In this embodiment, reference Figure 8 and Figure 9 As shown, before the diaphragm adhesive layer 132 is formed, the width A of the diaphragm 13 is between 4 mm and 10 mm; after the protruding end 131 of the diaphragm 13 is scraped down to make it tilted, and the diaphragm adhesive layer 132 is formed by hot pressing, the width A2 of the diaphragm 13 is between 3 mm and 9 mm.

[0130] The width B of the positive electrode 11 is between 2 mm and 8 mm; the width C of the negative electrode 12 is between 2.5 mm and 8.5 mm.

[0131] After the separator adhesive layer 132 is formed by hot pressing, the length of the separator 13 extending beyond the positive electrode 11 is 20% to 60% of the length of the separator 13 extending beyond the positive electrode 11 before the separator adhesive layer 132 is formed, preferably 30% to 50%.

[0132] In the description of this invention, it should be understood that the terms "center," "length," "width," "thickness," "top," "bottom," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," "outer," "axial," and "circumferential," etc., used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the indicated position or component must have a specific orientation, or a specific structure and operation, and therefore should not be construed as a limitation of this invention.

[0133] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0134] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0135] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A button cell structure, comprising a winding core (10) formed by winding a laminated structure and having a hollow inner hole (14), a first tab (20) and a second tab (30) being welded on the winding core (10), the laminated structure comprising at least one positive electrode sheet (11), at least one negative electrode sheet (12) and a separator (13) separating the at least one positive electrode sheet (11) and the at least one negative electrode sheet (12), characterized in that, The at least two ends of the winding core (10) are provided with a diaphragm adhesive layer (132) wrapping the winding core (10), the diaphragm adhesive layer (132) is used for fixing the positive plate (11) and the negative plate (12), the protruding end (131) of each coil of diaphragm (13) partially overlaps the protruding end (131) of the diaphragm (13) of the adjacent inner coil; the width of the protruding end (131) is greater than or equal to the sum of the thickness of the positive plate (11), the thickness of the negative plate (12) and the thickness of the diaphragm (13); the first tab (20) is located at the outer coil of the winding core (10), and the outer side of the positive plate (11) or the negative plate (12) connected with the first tab (20) is provided with the diaphragm (13); In addition to a layer of diaphragm (13) provided at the outer coil of the positive plate (11) or the negative plate (12) connected with the first tab (20) and the second tab (30), the protruding end (131) of the diaphragm (13) of the inner coil of the remaining positive plate (11) or the negative plate (12) is inclined to the inner hole (14) of the winding core (10), and the adjacent protruding ends (131) are bonded to each other to form a first diaphragm adhesive layer; The diaphragm adhesive layer (132) includes a first diaphragm adhesive layer located on the inner side of the first tab (20) and a second diaphragm adhesive layer located on the outer side of the first tab (20), and the bonding force of the first diaphragm adhesive layer is greater than that of the second diaphragm adhesive layer; wherein the bonding force refers to the size of the force required to separate the diaphragm adhesive layer (132); the area of the second diaphragm adhesive layer covering the first tab (20) accounts for 5% to 30% of the area of the first tab (20).

2. The button cell cell structure of claim 1, wherein, Before forming the diaphragm adhesive layer (132), the width A of the diaphragm (13) is 4mm to 10mm; after forming the diaphragm adhesive layer (132), the width A2 of the diaphragm (13) is 3mm to 9mm.

3. The button cell cell structure of claim 2, wherein, The width B of the positive plate (11) is 2mm to 8mm, and the width C of the negative plate (12) is 2.5mm to 8.5mm.

4. A button cell comprising the button cell cell structure of any one of claims 1-3, wherein, It also includes a shell (50) having a containing cavity (51) containing the button cell core structure in the shell (50), the bending part (21) of the first tab (20) is located on at least one end face of the winding core (10), the bending part (21) of the first tab (20) contacts the diaphragm adhesive layer (132), and the bending part (21) of the first tab (20) is electrically connected with the end face of the shell (50).

5. A method of manufacturing a structure of a coin cell battery, for manufacturing the structure of the coin cell battery according to any one of claims 1 to 3, characterized by, It includes: A winding core (10) is provided, the winding core (10) includes a positive plate (11), a negative plate (12) and a diaphragm (13) separating the positive plate (11) and the negative plate (12); A first tab (20) and a second tab (30) are provided; The first tab (20) and the second tab (30) are welded; The heating plate (40) is provided and heated to a preset temperature, including providing an arc-shaped heating plate (41) and a first planar heating plate (42), and heating the arc-shaped heating plate (41) and the first planar heating plate (42) to the preset temperature, the preset temperature being 122-128℃; The heating plate (40) scrapes the separator (13) at both ends of the winding core (10) from outside to inside, so that the protruding end (131) of the separator (13) forms an inclined protruding end (131); The heating plate (40) hot-presses the inclined protruding end (131), so that the inclined protruding end (131) forms a separator bonding layer (132) which is bonded and shrunk in sequence; The first and second tabs (20, 30) are scraped and pressed, so as to be pressed against the end surface of the separator bonding layer (132); The separator (13) of the outermost circle of the winding core (10) is scraped and pressed, so as to be bonded to the separator bonding layer (132).

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