Button cell

Abstract

The utility model provides a button cell, and the button cell comprises a first housing assembly which comprises a first substrate, a first annular wall and a sealing member, the first annular wall is arranged at the periphery of the first substrate in a surrounding manner, the first annular wall and the first substrate form an accommodating cavity, and at least a part of the sealing member is located at one side, deviating from the accommodating cavity, of the first annular wall; the second shell comprises a second base plate and a second annular wall, the second base plate is used for covering and sealing the containing cavity, the second annular wall is connected to the periphery of the second base plate, the second annular wall comprises a lap joint end, and the lap joint end extends along the side away from the second base plate and is used for forming a sealing structure with the sealing piece and the first annular wall; the second sealing part comprises a first end close to the first base plate, the first end is provided with a first inclined face, and the first inclined face is obliquely arranged relative to the first annular wall. According to the button cell provided by the embodiment of the invention, the problem that the negative electrode cover is easy to bend when the existing button cell is assembled can be solved.

Description

Technical Field

[0001] The present application belongs to the field of batteries, and in particular to a button battery. Background Art

[0002] Button cells are also called button cells. Generally speaking, they have a larger diameter and a thinner thickness. Button cells usually include a positive electrode cover and a negative electrode cover. When assembling a button cell, the positive electrode cover needs to be assembled to the negative electrode cover.

[0003] In the related art, assembly pressure is generated during the assembly process of button batteries. When the assembly pressure is too large, the negative electrode cover will bend, affecting the battery performance and life. Utility Model Content

[0004] The embodiment of the present application provides a button-type battery to solve the problem that the negative electrode cover of the existing button-type battery is easily bent during assembly.

[0005] The embodiment of the present application provides a button battery, comprising: a first housing assembly, comprising a first substrate, a first annular wall, and a sealing member, wherein the first annular wall is disposed around the periphery of the first substrate and forms a receiving cavity with the first substrate, and at least a portion of the sealing member is located on a side of the first annular wall away from the receiving cavity;

[0006] A second housing, comprising a second substrate and a second annular wall, wherein the second substrate is used to cover and seal the accommodating cavity, a first end of the second annular wall is connected to a periphery of the second substrate, and a second end of the second annular wall extends along a side away from the second substrate, and is used to form a sealing structure with the sealing member and the first annular wall;

[0007] The sealing member includes a first end located on a side of the first annular wall away from the accommodating cavity and close to the first substrate, the first end is provided with a first inclined surface, the first inclined surface is inclined relative to the first annular wall, and the overlapping end abuts against the first inclined surface.

[0008] In some embodiments, the first end also includes a first top surface, the first top surface is adjacent to the first annular wall, the first inclined surface is connected to an end of the first top surface facing away from the first annular wall, and is inclined from the first top surface in a direction away from the first annular wall and away from the first substrate, and the first inclined surface is in contact with the second annular wall.

[0009] In some embodiments, the value of the angle between the first inclined surface and the plane where the first ring wall is located is defined as a1, and the value of the angle between the first inclined surface and the plane where the second substrate is located is defined as a2, and a1 and a2 are different.

[0010] In some embodiments, the value range of the numerical value L1 of the distance between the end of the first inclined surface close to the first substrate and the first annular wall is: 0.18 mm to 0.23 mm; the value range of the numerical value a2 of the angle between the first inclined surface and the plane where the second substrate is located is: 20° to 40°.

[0011] In some embodiments, the first end further includes a first top surface, the first inclined surface is adjacent to the first annular wall, and the first top surface is connected to the end of the first inclined surface far from the first annular wall;

[0012] The first inclined surface is inclined from the first top surface towards the first annular wall and towards the second substrate.

[0013] In some embodiments, the end of the seal away from the first substrate is provided with a second inclined surface and a second top surface. The second top surface is used to abut against the second substrate. The second inclined surface is connected to the end of the second top surface away from the first annular wall and is inclined from the second top surface towards the second annular wall and towards the first substrate.

[0014] In some embodiments, the first inclined surface includes a first end close to the first substrate and a second end close to the second substrate. Along the horizontal direction, the distance between the first end and the second end is B1, and along the vertical direction, the distance between the first end and the second end is B2. The ratio of B1 to B2 is greater than or equal to 0.5 and less than or equal to 2.5.

[0015] In some embodiments, the seal is an O-ring, and the first inclined surface is provided around the circumference of the O-ring.

[0016] In some embodiments, the seal is injection molded on the first substrate and the first annular wall.

[0017] In some embodiments, the button cell further includes a negative electrode, a positive electrode, and a separator disposed in the accommodation cavity. The negative electrode is disposed close to the first substrate, the positive electrode is disposed close to the second substrate, and the separator is disposed between the positive electrode and the negative electrode.

[0018] In some embodiments, the material of the seal is one of polypropylene and polytetrafluoroethylene.

[0019] In some embodiments, the minimum distance between the first annular wall and the second annular wall is G2, and the average thickness of the second substrate is T. The ratio of G2 to T is 60% - 200%.

[0020] In some embodiments, the minimum distance between the first annular wall and the second substrate is G3, the average thickness of the second substrate is T, and the ratio of G3 to T is 340%-560%.

[0021] For the button cell provided in the embodiment of the present application, when the first housing assembly and the second housing are assembled, due to the provision of the first inclined surface which is inclined relative to the first annular wall, according to the principle of force distribution in dynamics in theoretical mechanics, using an inclined surface at a certain angle can effectively reduce the horizontal extrusion force and concentrate the force in the vertical direction, thereby avoiding the bending phenomenon of the first substrate of the first housing assembly. At the same time, it has a better sealing effect, ensuring the sealing performance of the button cell, being able to inhibit the volatilization of the electrolyte in the button cell, and improving the battery performance and battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

[0023] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings. Among them, the same reference numerals in the following description represent the same parts.

[0024] Figure 1 It is a schematic structural diagram of the button cell provided in the embodiment of the present application.

[0025] Figure 2 For Figure 1 a cross-sectional view of an embodiment of the button cell.

[0026] Figure 3 For Figure 2 a partial structural schematic diagram of the button cell shown.

[0027] Figure 4 For Figure 2 a partial structural schematic diagram of the button cell shown.

[0028] Figure 5 For Figure 3 a structural schematic diagram of removing the second housing from the structure shown.

[0029] Figure 6 For Figure 5 a partial enlarged view of A in

[0030] Figure 7 For Figure 1 a cross-sectional view of a partial structure of another embodiment of the button cell shown.

[0031] Figure 8 For Figure 7 The partial enlarged view at position B in Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0033] The embodiments of the present application provide a button cell to solve the problem that the negative electrode cover is easily bent during the assembly of the existing button cell. The following will be described in conjunction with the drawings.

[0034] The button cell provided by the embodiments of the present application, please combine Figure 1 , the button cell includes: a first housing assembly 10 and a second housing 30. Please combine Figure 2 And Figure 3 , the first housing assembly 10 includes a first substrate 11, a first annular wall 13 and a seal 15. The first annular wall 13 is disposed around the periphery of the first substrate 11 and forms a receiving cavity 12 with the first substrate 11. The material of the seal 15 should be elastic, such as soft rubber, silicone rubber, etc., or it can also be a plastic material, such as one of polypropylene PP8830, polypropylene DX-23, DX-231, polytetrafluoroethylene, or other elastic fiber materials. The second housing 30 can be formed into the required shape by an integral stamping process.

[0035] In some specific embodiments, the first annular wall 13 can be perpendicular to the plane where the first substrate 11 is located, and the plane where the first substrate 11 is located can be a horizontal plane. In other specific embodiments, the first annular wall 13 can also not be perpendicular to the plane where the first substrate 11 is located.

[0036] The first annular wall 13 and the first substrate 11 can be integrally formed. For example, a metal plate can be stamped to form the first annular wall 13 and the first substrate 11. In other specific embodiments, the first annular wall 13 and the first substrate 11 can also be connected by welding or other means.

[0037] Please combine Figure 2, the seal 15 is at least partially disposed on the outer peripheral side of the first annular wall 13, and the outer peripheral side of the first annular wall 13 is specifically the side of the first annular wall facing away from the accommodation cavity, so as to achieve a better sealing effect. Specifically, the seal 15 may include a first sealing portion 152 and a second sealing portion 154 connected to each other. The first sealing portion 152 is disposed in the accommodation cavity 12, and the second sealing portion 154 is disposed on the side of the first annular wall 13 facing away from the accommodation cavity 12. Thus, during the assembly process, the seal 15 is not easily displaced, and the sealing effect is good.

[0038] Please refer to Figure 3 , the second housing 30 may include a second substrate 31 and a second annular wall 33. The second substrate 31 is used to cover and seal the accommodation cavity 12. After the second housing 30 is assembled to the first housing assembly 10, the second annular wall 33 is located on the outer peripheral side of the first annular wall 13. Limited by factors such as processing accuracy and cost, there may be a gap between the inner wall surface of the second annular wall 33 and the outer wall surface of the first annular wall 13. The seal 15 is provided such that at least a part of it is located between the first annular wall 13 and the second annular wall 33, so as to seal the gap between the inner wall surface of the second annular wall 33 and the outer wall surface of the first annular wall 13, preventing external water vapor and dust from entering the interior of the button cell and affecting the performance of the button cell.

[0039] Please refer to Figure 3 , in some embodiments, the second annular wall 33 is connected to the periphery of the second substrate 31, and the overlapping end 331 of the second annular wall 33 extends along the side facing away from the second substrate 31 for forming a sealing structure with the seal 15 and the first annular wall 13. In some specific embodiments, the second annular wall 33 may be disposed perpendicular to the plane of the second substrate 31, and the plane of the second substrate 31 may be a horizontal plane. In some other specific embodiments, the second annular wall 33 may not be disposed perpendicular to the plane of the second substrate 31 either.

[0040] Please refer to Figure 3 , wherein, the second sealing portion 154 includes a first end 1541 close to the first substrate 11. The first end 1541 is located on the side of the first annular wall 13 facing away from the accommodation cavity and is close to the first substrate 11. The first end 1541 is provided with a first inclined surface 153, and the first inclined surface 153 is inclined relative to the first annular wall 13 and abuts against the second housing 30. Specifically, the overlapping end 331 of the second annular wall 33 abuts against the first inclined surface 153.

[0041] In the embodiments of the present application, when the first housing assembly 10 is assembled with the second housing 30, the first inclined surface 153 can disperse the assembly pressure during the battery sealing process, avoiding the bending phenomenon of the first substrate 11 of the first housing assembly 10. At the same time, the presence of the first inclined surface 153 improves the compression rate and balance of the seal 15, thereby having a good sealing effect, ensuring the sealing of the button battery, being able to inhibit the volatilization of the electrolyte in the button battery, and improving the battery performance and battery life.

[0042] Further, according to actual requirements, the inclined surface of the first end 1541 may include: an outer inclined surface, an inner inclined surface, an outer R corner (round corner), etc.

[0043] In some specific embodiments, the inclined surface of the first end 1541 is set to an outer inclined surface structure, for example Figures 2 to 6 , the inclined surfaces of the first ends 1541 are all set to an outer inclined surface structure, and the angle of the outer inclined surface can be 32° - 40°. When the angle is within the range of 32° - 40°, the assembly force can be effectively distributed during the sealing process of the battery cell assembly. Moreover, the outer inclined surface structure can guide the second housing 30, enabling the smooth and precise assembly of the second housing 30 and the first housing assembly 10 during the encapsulation process. The inner side of the second housing 30 is continuously and closely fitted with the seal 15, avoiding assembly deviation and ensuring the position accuracy. The specific angles of the outer inclined surface can be: 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°.

[0044] In some specific embodiments, for example Figures 7 to 8 , the inclined surfaces of the first ends 1541 are all set to an inner inclined surface structure. When the end of the seal 15 facing away from the second housing 30 is set to an inner inclined surface: the range of the inner inclined angle can be: 20° - 40°, for example, it can be: 20°, 25°, 26°, 27°, 28°, 29°, 30°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°.

[0045] In some specific embodiments, the inclined surface of the first end 1541 is set to an outer R corner (round corner) structure, and the R value (or radius) of the outer R corner can be 0.2 mm - 0.8 mm. Further, it can be 0.3 mm - 0.8 mm, for example, it can be: 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm.

[0046] In the embodiments of the present application, the inclined surface of the first end 1541 is set to an outer inclined surface structure, so that the first substrate 11 has a smaller bending degree and has a better effect of distributing the assembly force during the assembly process.

[0047] It is easy to understand that in the embodiment of the present application, during the process of assembling the second shell 30 (or referred to as the positive electrode cover) to the first shell assembly 10 (or referred to as the negative electrode integrated cover), the first inclined surface can distribute the assembly force, and during the assembly process, the axial direction of the seal 15 can be kept the same as the axial direction of the second shell 30 (or referred to as the positive electrode cover), so that the seal 15 can be centered in the second shell 30, avoiding the seal 15 deviation phenomenon in the button battery after packaging, so that the positive electrode and the second shell 30 always maintain a larger contact area, and the button battery has better performance. The second shell 30 applies a balanced pressure on the surroundings of the seal 15, so that the surroundings of the seal 15 can be evenly compressed, improving the compression rate and balanced performance of the seal 15, thereby improving the sealing performance, making the button battery more sealed and not easy to leak, thereby effectively inhibiting the volatilization of the electrolyte and preventing the intrusion of external moisture. Since the seal 15 applies a balanced pressure on the surroundings of the seal 15, the seal 15 applies a balanced pressure on the surroundings of the first annular wall 13, so that the bending phenomenon of the first substrate 11 in the first shell assembly 10 can be effectively avoided. During the sealing process, the assembly force generated comes from the horizontal extrusion pressure of the mold during the descending process of the assembled battery cell. According to the force distribution principle of dynamics in theoretical mechanics, the use of a certain angle of inclined surface can effectively reduce the horizontal extrusion pressure, thereby making the horizontal force on the first substrate 11 in the first shell assembly 10 smaller and concentrating the force in the vertical direction to avoid bending.

[0048] In some specific implementations, please combine Figure 3 The first end 1541 may further include a first top surface 156, the first top surface 156 is adjacent to the first annular wall 13, and the first inclined surface 153 is connected to an end of the first top surface 156 facing away from the first annular wall 13. That is to say, in this embodiment, the first top surface 156 is located between the first annular wall 13 and the first inclined surface 153, and the first inclined surface 153 is arranged on the outer side of the first end 1541, that is, on the side close to the second annular wall 33.

[0049] The first inclined surface 153 may be inclined in a direction from the first top surface 156 to a direction away from the first annular wall 13 and away from the first substrate 11 , and the first inclined surface 153 is in contact with the second annular wall 33 .

[0050] Furthermore, please combine Figure 5 as well as Figure 6 , the value of the angle between the first inclined surface 153 and the plane where the first annular wall 13 is located is defined as a1, and the value of the angle between the first inclined surface 153 and the plane where the second substrate 31 is located is defined as a2, and a1 and a2 are different. In this way, the first inclined surface 153 is an asymmetric inclined surface structure, so that the button battery has better sealing performance.

[0051] Furthermore, please combine Figure 5 as well asFigure 6 The value range of the numerical value L1 of the distance between one end of the first inclined surface 153 close to the first substrate 11 and the first annular wall 13 is: 0.18 mm to 0.23 mm. In some embodiments, the value range of the numerical value a2 of the included angle between the first inclined surface 153 and the plane where the second substrate 31 is located is: 20° to 40°. In this way, the pressure on the first housing assembly 10 during the assembly process can be effectively distributed, the pressure on the first substrate 11 can be reduced, the compression rate of the seal can be increased, and the sealing performance can be improved. It is easy to understand that when the first top surface 156 is a horizontal plane, L1 is the length of the first top surface 156. In some other embodiments, the value of the numerical value a2 of the included angle between the first inclined surface 153 and the plane where the second substrate 31 is located can be 30°, or the value of a2 can be 45°.

[0052] In some specific embodiments, please refer to Figure 7 The first end 1541 further includes a first top surface 156. The first inclined surface 153 is adjacent to the first annular wall 13, and the first top surface 156 is connected to one end of the first inclined surface 153 away from the first annular wall; that is to say, the difference between this embodiment and the previous specific embodiment is that in this embodiment, the first inclined surface 153 is located between the first annular wall 13 and the first top surface 156, and the first inclined surface 153 is located inside the first end 1541, that is, on the side close to the first annular wall 13. The first inclined surface is inclined from the first top surface towards the first annular wall and towards the second substrate.

[0053] In some embodiments, please refer to Figure 3 , Figure 5 , Figure 7 , the end of the seal 15 facing away from the first substrate 11 is provided with a second inclined surface 151 and a second top surface 158. The second top surface 158 is used to abut against the second substrate 31. The second inclined surface 151 is connected to one end of the second top surface facing away from the first annular wall 13, and is inclined from the second top surface towards the second annular wall and towards the first substrate 11. When the second housing 30 is assembled to the first housing assembly 10, it can be assembled by stamping. The second inclined surface 151 can guide the second housing 30, so that the second housing 30 can be assembled to the first housing assembly 10 more smoothly and accurately.

[0054] In some embodiments, please refer to Figure 5 and Figure 6, the first inclined surface 153 includes a first end 1511 of the first inclined surface close to the first substrate 11 and a second end 1513 of the first inclined surface close to the second substrate 31. Along the horizontal direction, the distance between the first end 1511 and the second end 1513 of the first inclined surface is B1, and along the vertical direction, the distance between the first end 1511 and the second end 1513 of the first inclined surface is B2. The ratio of B1 to B2 is greater than or equal to 0.5 and less than or equal to 2.5. For example, the ratio of B1 to B2 can be 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5. Further, the ratio of B1 to B2 can be from 0.5 to 1.5. For example, the ratio of B1 to B2 can be 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5. In this way, the assembly difficulty can be reduced, and the manufacturing feasibility and assembly efficiency can be improved;

[0055] In some embodiments, the seal can be an O-ring, and the first inclined surface is disposed around the circumference of the O-ring. In this way, the inclined surfaces around the O-ring can guide the second housing 30, and the guiding effect is better.

[0056] In some embodiments, please refer to Figure 2 and Figure 5 , the button cell further includes a negative electrode 60, a positive electrode 70, and a separator 80 disposed in the accommodation cavity 12. The negative electrode 60 is disposed close to the first substrate 11, the positive electrode 70 is disposed close to the second substrate 31, and the separator 80 is disposed between the positive electrode 70 and the negative electrode 60.

[0057] The first substrate 11, the first annular wall 13, and the seal 15 can be processed into an integrated first housing assembly 10. The seal 15 can be injection molded on the first substrate 11 and the first annular wall 13. During assembly, the negative electrode 60 needs to be placed in the accommodation cavity 12, and the separator 80 and the positive electrode 70 are sequentially placed on the side of the negative electrode facing away from the first substrate 11. Thus, the separator 80 is located between the negative electrode 60 and the positive electrode 70, achieving the effect of isolating the negative electrode 60 and the positive electrode 70. After that, the electrolyte also needs to be injected, the second housing 30 is covered on the first housing assembly 10, and finally sealed to form a button cell. After assembly, the button cell also needs to be pre-discharged and aged.

[0058] In some embodiments, please refer to Figure 6, the first substrate 11, the first annular wall 13, and the seal 15 are integrally formed. To improve the sealing effect, in some embodiments, the seal 15, the first substrate 11, and the first annular wall 13 are processed by injection molding. Part of the structure of the mold required for injection molding can adopt a specific angle surface structure design to ensure that the outer side of the formed first housing assembly, that is, the seal 15 forms an asymmetric plane structure with a specific angle included angle in the direction of the top horizontal plane.

[0059] In these embodiments, the first substrate 11, the first annular wall 13, and the seal 15 can be configured as an integrally formed structure. At this time, the first substrate 11, the first annular wall 13, and the seal 15 deform together under force, and it is not easy to generate gaps between the first substrate 11, the first annular wall 13, and the seal 15. In addition, it can also reduce the assembly process of the seal 15 and the first housing assembly 10 and improve the sealing performance of the seal 15 and the first housing assembly 10, thereby improving production efficiency. The sealing performance between the integrally formed seal 15, the first substrate 11, and the first annular wall 13 is better.

[0060] In some embodiments, the material of the seal 15 is one of polypropylene and polytetrafluoroethylene.

[0061] Please combine Figure 4 , for ease of description, define the average thickness of the plate of the second housing 30 as T. In some embodiments, since the second substrate 31 and the second annular wall 33 are formed by stamping a plate, the average thickness of the plate of the second substrate 31 can be defined as T.

[0062] The shortest distance between the first annular wall 13 and the second annular wall 33 (i.e., the shortest side wall gap distance) is G2, the average thickness of the second substrate 31 is T, and the ratio of G2 to T is 60%-200%. For example, the ratio of G2 to T can be 60%, 70%, 80%, 90%, 100%, 110%, 120%, 130%, 140%, 150%, 160%, 170%, 180%, 190%, 200%.

[0063] The shortest distance between the first annular wall 13 and the second substrate 31 (i.e., the shortest bottom gap distance) is G3, the average thickness of the second substrate 31 is T, and the ratio of G3 to T is 340%-560%. For example, the ratio of G3 to T can be 340%, 360%, 380%, 400%, 420%, 440%, 460%, 480%, 500%, 520%, 540%, 560%.

[0064] The shortest distance G1 between the first housing assembly 10 of the button cell and the mouth of the second housing 30 relative to the average thickness T of the plate of the second housing is 80%-120%.

[0065] Please combine with Figure 4 , the range of the shortest distance G1 value between the first housing assembly 10 of the button cell and the mouth of the second housing 30 can be: 0.2 mm to 0.35 mm, specifically it can be: 0.2 mm, 0.23 mm, 0.25 mm, 0.3 mm, 0.35 mm.

[0066] Please combine with Figure 4 , the range of the shortest distance G2 value of the side wall gap can be 0.15 mm to 0.45 mm, specifically it can be: 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm; the range of the shortest distance G3 value of the bottom gap can be: 0.85 mm to 1.3 mm, specifically it can be: 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.25 mm, 1.3 mm.

[0067] Please combine with Figure 4 , after the second housing 30 is sealed, the range of the R curvature radius can be 0.8 mm to 1.2 mm, further, it can be 0.9 mm to 1.1 mm, specifically it can be: 0.9 mm, 0.95 mm, 1.0 mm, 1.05 mm, 1.1 mm.

[0068] Please combine with Figure 4 and Figure 6 , the side wall height dimension H3 of the seal 15 relative to the average height H0 of the finished battery cell is: 100%-106%. The side wall height dimension H3 of the seal 15 mentioned here is the height when the seal 15 is in the uncompressed state, that is, the unfolded state. In this way, the cooperation between the first housing assembly 10 and the second housing 30 after assembly can be made closer, which can effectively prevent the volatilization of the electrolyte and the intrusion of external moisture, and improve the sealing performance of the battery cell.

[0069] In the embodiment of the present application, by providing the first inclined surface, the horizontal extrusion force can be effectively reduced, and further, the first substrate 11 in the first housing assembly 10 is less stressed horizontally and more stressed vertically, avoiding the occurrence of bending phenomena. The first inclined surface can include an outer inclined surface. To further improve the sealing effect, the included angle a2 between the first inclined surface 153 and the plane where the second substrate 31 is located is 30°.

[0070] Specifically, the material of the seal 15 can be polypropylene PP8830, the shortest distance G1 between the first housing assembly 10 of the button cell and the mouth of the second housing 30 = 0.23 mm, the shortest distance G2 of the side wall gap = 0.30 mm, the shortest distance G3 of the bottom gap = 1.2 mm, the R after the second housing 30 is sealed = 1.1 mm, and the outer inclined surface angle a2 of the top of the seal 15 = 30°。

[0071] After experimental verification, when a2 is 30°, the evaporation of the electrolyte can be reduced, achieving the purpose of improving the battery sealing performance. Moreover, it can effectively prevent internal poor contact caused by the outward bulge of the steel shell in a high-temperature environment. Therefore, the battery characteristics will not deteriorate, and the electrical performance stability of the battery is higher.

[0072] A button cell, also known as a coin cell, generally has a relatively large diameter and a relatively thin thickness. A button cell usually includes a positive cap and a negative cap. When assembling a button cell, the process of assembling the positive cap to the negative cap needs to be involved, and the battery sealing process is also involved. During the process of installing the positive cap on the negative cap, the positive cap needs to be pressed downward towards the direction where the negative cap is located, and the negative cap and the sealing ring will be subjected to a relatively large assembly pressure. When the assembly pressure is too large, it will cause the negative cap to bend, affecting the battery performance and life.

[0073] Both the punching force and the forming force generated during the sealing process will cause the negative cap to receive a relatively large impact. As a result, the negative cap is deformed. On the one hand, it may cause a gap between the negative cap and the sealing ring, and on the other hand, it may cause a gap between the negative cap and the positive cap, both of which will affect the sealing performance of the battery core. Specifically, the battery sealing process specifically includes a stamping process and a sealing process. Among them, the stamping process specifically refers to the process of placing the combination of the negative cap and the positive cap in a sealing mold and forming the battery core through mechanical movement. During the sealing process, through mechanical movement stamping, a punching force will be generated, and the punching force will be transmitted to the negative cap, causing the negative cap to receive the punching force of the upper sealing die. The sealing process specifically refers to the process of installing the positive cap on the negative cap, then the upper sealing die, and performing a necking operation on the end of the positive cap facing the negative cap and the end of the negative cap. During the sealing process, it is necessary to use the mold to apply a forming force to the end of the negative cap to neck the end of the negative cap, resulting in the negative cap receiving the forming force of the mold. Since in the sealing process of the button cell, the end of the positive cap facing the negative cap needs to be necked, the positive cap will be bent and deformed in the mold, the rubber ring will deform following the positive cap and squeeze the negative cap, generating a relatively large pressure on the circumferential wall of the negative cap, and the negative cap is easily deformed, resulting in gaps between the negative cap and the sealing ring and the positive cap, and between the negative cap and the sealing ring, affecting the sealing performance of the button cell.

[0074] In the embodiments of the present application, to solve the above problems:

[0075] First aspect: In the embodiment of the present application, a first inclined surface is provided on the side of the seal 15 facing the first substrate 11. The first inclined surface 153 can disperse the assembly pressure during the battery sealing process, so that the impact force generated by the assembly is smaller. The bending phenomenon of the first substrate 11 of the first shell assembly 10 is avoided. At the same time, the presence of the first inclined surface 153 improves the compression rate and balance of the seal 15, so as to have a good sealing effect, ensure the sealing of the button battery, and can inhibit the volatilization of the electrolyte in the button battery, thereby improving the battery performance and battery life.

[0076] Second aspect: Based on the first aspect, a first inclined surface 153 is provided around the sealing member so that the inner side of the second housing 30 can continuously and tightly fit the first housing assembly 10, thereby avoiding assembly deviation and ensuring position accuracy.

[0077] The third aspect: the first substrate 11, the first annular wall 13 and the seal 15 are integrally formed. In the embodiment of the present application, the first housing assembly 10 includes the first substrate 11, the first annular wall 13 and the seal 15. The first substrate 11, the first annular wall 13 and the seal 15 are integrally formed structures, so that the first substrate 11, the first annular wall 13 and the seal 15 deform together after being subjected to force, and it is not easy to generate a gap between the first annular wall 13 and the sealing ring. In addition, it also has the effect of reducing the assembly process of the first substrate 11, the first annular wall 13 and the seal 15, improving the sealing performance of the first substrate 11, the first annular wall 13 and the seal 15, thereby improving production efficiency.

[0078] Fourth aspect: In the embodiment of the present application, a second inclined surface 151 is provided at the end of the seal away from the first substrate 11. The second inclined surface 151 has a guiding function and can guide the second housing 30, so that the second housing 30 and the first housing assembly 10 are assembled smoothly and accurately.

[0079] A fifth aspect: the first substrate 11, the first annular wall 13 and the seal 15 are an integrally formed structure, and a first inclined surface is provided on the seal 15. At this time, during the assembly of the second housing 30 and the first housing assembly 10, the first inclined surface can disperse the assembly pressure during the battery sealing process, avoid bending of the first substrate 11 of the first housing assembly 10, improve the compression rate and balance of the seal 15 between the seal 15 and the second housing 30, inhibit the volatilization of the electrolyte, and ensure the sealing of the button battery.

[0080] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0081] In the description of the present application, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0082] The button cell provided by the embodiments of the present application has been introduced in detail above. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A button battery, characterized in that: include: A first housing component (10) comprises a first substrate (11), a first annular wall (13) and a sealing member (15), wherein the first annular wall (13) is arranged around the periphery of the first substrate (11) and forms a receiving cavity (12) with the first substrate (11), and at least a portion of the sealing member (15) is located on a side of the first annular wall away from the receiving cavity; A second shell (30), comprising a second substrate (31) and a second annular wall (33), wherein the second annular wall (33) is connected to the periphery of the second substrate (31), and the second annular wall (33) comprises an overlapping end (331), wherein the overlapping end (331) extends along a side away from the second substrate (31) and is used to form a sealing structure with the sealing member (15) and the first annular wall (13); The sealing member (15) comprises a first end (1541), the first end (1541) is located on a side of the first annular wall away from the accommodating cavity and is arranged close to the first substrate (11), the first end (1541) is provided with a first inclined surface (153), the first inclined surface (153) is inclined relative to the first annular wall (13), and the overlapping end (331) abuts against the first inclined surface (153).

2. The button battery according to claim 1, characterized in that: The first end (1541) also includes a first top surface (156), the first top surface (156) is adjacent to the first annular wall (13), the first inclined surface (153) is connected to an end of the first top surface (156) facing away from the first annular wall (13), and is inclined from the first top surface (156) in a direction away from the first annular wall (13) and away from the first substrate (11), and the first inclined surface (153) is in contact with the second annular wall (33).

3. The button battery according to claim 2, characterized in that: The value of the angle between the first inclined surface (153) and the plane where the first ring wall (13) is located is defined as a1, and the value of the angle between the first inclined surface (153) and the plane where the second substrate (31) is located is defined as a2, and a1 and a2 are different.

4. The button cell according to claim 3, characterized in that: The value L1 of the distance between the end of the first inclined surface (153) close to the first substrate (11) and the first ring wall (13) is in the range of 0.18 mm to 0.23 mm, and the value a2 of the angle between the first inclined surface (153) and the plane where the second substrate (31) is located is in the range of 20° to 40°.

5. The button battery according to claim 1, characterized in that: The first end (1541) also includes a first top surface, the first inclined surface is adjacent to the first annular wall (13), and the first top surface (156) is connected to an end of the first inclined surface (153) away from the first inclined surface (153) and away from the first annular wall (13); the first inclined surface is inclined from the first top surface toward the first annular wall and toward the second substrate.

6. The button cell according to any one of claims 1 to 5, characterized in that: The end of the sealing member facing away from the first substrate (11) is provided with a second inclined surface (151) and a second top surface (158); the second top surface (158) is used to abut against the second substrate; the second inclined surface (151) is connected to an end of the second top surface (158) facing away from the first annular wall (13), and is inclined from the second top surface (158) toward the second annular wall (33) and the first substrate (11).

7. The button cell according to claim 6, characterized in that: The first inclined surface (153) comprises a first end close to the first substrate (11) and a second end close to the second substrate (31); along the horizontal direction, the distance between the first end and the second end is B1; along the vertical direction, the distance between the first end and the second end is B2; the ratio of B1 to B2 is greater than or equal to 0.5, and the ratio of B1 to B2 is less than or equal to 2.

5.

8. The button cell according to any one of claims 1 to 5, characterized in that: The sealing member is a sealing ring, and the first inclined surface is arranged on the circumference of the sealing ring.

9. The button cell according to any one of claims 1 to 5, characterized in that: The sealing member (15) is injection-molded on the first substrate (11) and the first annular wall (13).

10. The button cell according to any one of claims 1 to 5, characterized in that: The button battery also includes a negative electrode (60), a positive electrode (70) and a diaphragm (80) arranged in the accommodating cavity (12), the negative electrode (60) being arranged close to the first substrate (11), the positive electrode (70) being arranged close to the second substrate (31), and the diaphragm (80) being arranged between the positive electrode (70) and the negative electrode (60).

11. The button cell according to any one of claims 1 to 5, characterized in that: The material of the sealing element (15) is one of polypropylene and polytetrafluoroethylene.

12. The button cell according to any one of claims 1 to 5, characterized in that: The minimum distance between the first annular wall (13) and the second annular wall (33) is G2, the average thickness of the second substrate (31) is T, and the ratio of G2 to T is 60%-200%.

13. The button cell according to any one of claims 1 to 5, characterized in that: The minimum distance between the first ring wall (13) and the second substrate (31) is G3, the average thickness of the second substrate (31) is T, and the ratio of G3 to T is 340%-560%.

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