Button cell with liquid injection hole

Abstract

The utility model provides a button cell with a liquid injection hole. The button cell comprises a shell and a top cover assembly, the top cover assembly comprises an upper cover, an insulating part, a supporting plate, a boss and a sealing nail, the upper cover, the insulating part and the supporting plate are all in a ring sheet shape, the outer edge of the upper cover is connected with the opening edge of the shell, the insulating part is clamped between the supporting plate and the upper cover, the inner edge of the insulating part protrudes out of the inner edge of the upper cover, and the upper cover does not make direct contact with the supporting plate. One end of the boss is connected with the inner edge of the supporting plate, the other end of the boss penetrates through the hollow part of the insulating part, the boss is not in direct contact with the upper cover, and the battery forms polarity insulation. A liquid injection hole is formed in the boss, communicates with the two ends of the boss and is used for injecting electrolyte. The sealing nail comprises a nail column and a nail cap, the nail column is plugged in the liquid injection hole and used for preventing liquid leakage, the nail cap is welded to the boss, the nail cap is not prone to falling off, the nail column is connected with the nail cap, and the nail column is not prone to falling off, so that the sealing performance of the liquid injection hole is guaranteed, and the sealing performance of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a button battery with a liquid injection hole. Background Art

[0002] Electrolyte is one of the main materials of the battery and the discharge medium of the battery. Therefore, the injection process is particularly important in the preparation of the battery. In the prior art, most button batteries are not provided with injection holes. Even if a small number of button batteries have injection holes, the sealing effect at the injection holes is not good, and the injected electrolyte is easy to leak from the injection holes, so that the injection holes do not play a substantial role in the actual application preparation. Utility Model Content

[0003] The utility model provides a button battery with a liquid injection hole, which can solve the problem of poor sealing of the liquid injection hole.

[0004] The technical solution of the utility model is as follows: the utility model provides a button battery with a liquid injection hole, comprising a shell and a top cover assembly, wherein the shell is in a cylindrical shape with one end open, and the top cover assembly is connected to the opening of the shell;

[0005] The top cover assembly comprises an upper cover, an insulating member, a support plate, a boss and a sealing nail, wherein the upper cover, the insulating member and the support plate are all in the shape of an annular sheet, the outer edge of the upper cover is connected to the opening edge of the shell, the insulating member is clamped between the support plate and the upper cover, and the inner edge of the insulating member protrudes from the inner edge of the upper cover; one end of the boss is connected to the inner edge of the support plate, and the other end is passed through the hollow part of the insulating member; an injection hole is provided on the boss, and the injection hole communicates with both ends of the boss;

[0006] The sealing nail comprises a nail cap and a nail column which are connected to each other. The nail column is sealed in the injection hole, and the nail cap is welded to the boss.

[0007] Furthermore, in the radial direction of the shell, the outer edge of the boss protrudes beyond the outer edge of the nail cap, and the outer edge of the nail cap is welded to the boss all around.

[0008] Furthermore, the nail cap is circular, and the boss is hollow cylindrical, and the two are coaxially arranged, and the outer diameter of the boss is 1.05-1.1 times the diameter of the nail cap.

[0009] Furthermore, the nail cap and the nail column are both made of metal and are integrally formed.

[0010] Furthermore, a sealing ring is provided between the outer peripheral surface of the nail column and the injection hole.

[0011] Furthermore, the nail column is interference fit with the injection hole.

[0012] Furthermore, the outer peripheral surface of the boss is cylindrical, and the injection hole is circular, and the two are coaxially arranged. The outer diameter of the boss is 3-4 times the hole diameter of the injection hole.

[0013] Furthermore, in the axial direction of the shell and in the direction toward the inside of the shell, the inner end surface of the boss protrudes from the nail column.

[0014] Furthermore, in the axial direction of the shell and in the direction outward of the shell, the outer surface of the upper cover protrudes from the boss, and the outer surface of the nail cap protrudes from the upper cover.

[0015] Furthermore, a limiting structure is provided between the outer edge of the upper cover and the opening edge of the outer shell.

[0016] Furthermore, a limiting structure is provided between the outer edge of the upper cover and the opening edge of the outer shell.

[0017] Compared with the prior art, the utility model has the following beneficial effects: since the outer shell is in the shape of a cylinder with one end open, the top cover assembly is connected to the opening of the outer shell, and the two form a closed space to accommodate other components of the battery. The top cover assembly includes an upper cover, an insulating member, a support plate, a boss and a sealing nail, the upper cover, the insulating member and the support plate are all in the shape of a ring sheet, the outer edge of the upper cover is connected to the opening edge of the outer shell, so that a closed space is formed inside the outer shell, the insulating member is clamped between the support plate and the upper cover, and the inner edge of the insulating member protrudes from the inner edge of the upper cover, the insulating member is insulated and connected between the upper cover and the support plate, the upper cover is not in direct contact with the support plate, and one end of the boss is connected to the inner edge of the support plate, and the other end is penetrated in the hollow of the insulating member, the boss is not in direct contact with the upper cover, and the support plate and the boss are not in direct contact with the upper cover, so as to ensure that the battery forms polar insulation; an injection hole is provided on the boss, the injection hole connects the two ends of the boss, and electrolyte can be injected into the battery through the injection hole. Since the nail column is sealed in the injection hole, when the injection is completed, the nail column can prevent the electrolyte from leaking out, and the nail cap is welded to the boss, the nail cap and the boss are tightly connected and not easy to fall off, and the nail column is connected to the nail cap, the nail column is not easy to fall out of the injection hole, so as to ensure the sealing of the injection hole, thereby improving the sealing of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the utility model.

[0019] Figure 1 This is a schematic structural diagram of a button battery with a liquid injection hole provided in the first embodiment of the utility model.

[0020] Figure 2 for Figure 1 A cross-sectional view of a button battery with a filling hole.

[0021] Figure 3 for Figure 1 A cross-sectional view of a button battery with a liquid injection hole from another angle.

[0022] Figure 4 for Figure 3 Enlarged view of part A.

[0023] Figure 5 for Figure 1 Exploded view of a button cell battery with a filling hole.

[0024] Figure 6 for Figure 1 A schematic diagram of the structure of the button battery with a liquid injection hole when the shell and the top cover assembly are assembled.

[0025] Figure 7 for Figure 1 Schematic diagram of the structure of the button battery with a liquid injection hole when the sealing pin and the liquid injection hole are assembled.

[0026] Figure 8 for Figure 1 Schematic diagram of the structure of the support plate, boss, insulating member and upper cover of the button battery with a liquid injection hole.

[0027] Fig. 9 for Figure 1 A cross-sectional view of a support plate, a boss, an insulating member and an upper cover of a button battery with a liquid injection hole.

[0028] Fig.10 for Figure 1 Schematic diagram of the structure of the sealing nail of the button battery with a liquid injection hole.

[0029] Fig.11 for Figure 1 Schematic diagram of the structure of the support plate and boss of the button battery with a liquid injection hole.

[0030] Fig.12 A cross-sectional view of a button battery with a liquid injection hole provided in the second embodiment of the utility model.

[0031] Fig.13 A cross-sectional view of a support plate, a boss, an insulating member and an upper cover of a button battery with a liquid injection hole provided in the third embodiment of the utility model.

[0032] Fig.14 A schematic structural diagram of a sealing nail of a button battery with a liquid injection hole provided in the fourth embodiment of the utility model.

[0033] Fig.15This is an enlarged structural view of the connection between the upper cover and the outer shell of a button battery with a liquid injection hole provided in the fifth embodiment of the utility model.

[0034] Fig.16 This is an enlarged structural view of the connection between the upper cover and the outer shell of a button battery with a liquid injection hole provided in the sixth embodiment of the utility model.

[0035] Fig.17 This is an enlarged structural view of the connection between the upper cover and the outer shell of a button battery with a liquid injection hole provided in the seventh embodiment of the utility model.

[0036] Among them, Figure 1-11 In the figure, 11, housing, 12, top cover assembly, 13, battery cell;

[0037] 111, limiting structure, 121, upper cover, 122, insulating member, 123, sealing nail, 124, nail cap, 125, nail column, 126, limiting portion, 127, liquid injection hole, 128, boss, 129, support plate, 131, first pole ear, 132, second pole ear;

[0038] 1271, chamfer;

[0039] exist Fig.12 21, housing, 22, top cover assembly, 23, battery cell, 231, first pole ear, 232, second pole ear;

[0040] exist Fig.13 In the embodiment, 321, upper cover, 322, insulating member, 323, groove, 328, boss, 329, support plate;

[0041] exist Fig.14 In the middle, 424, nail cap, 425, nail column, 426, sealing ring;

[0042] exist Fig.15 In the figure, 51, a housing, 511, a limiting structure, 521, an upper cover, 526, a limiting portion, 527, a clamping portion;

[0043] exist Fig.16 In the figure, 61, housing, 611, limiting structure, 621, upper cover, 627, clamping part;

[0044] exist Fig.17 In the embodiment of the present invention, 71, outer shell, 721, upper cover. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0046] Directional terms mentioned in the present invention, such as "inside", "outside", etc., are only used to refer to the directions of the drawings. The directional terms used are used to illustrate and understand the present invention, but are not used to limit the present invention.

[0047] In the present invention, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] See also Figure 1 The first embodiment of the utility model provides a button battery with a liquid injection hole, including a shell 11 and a top cover assembly 12. The shell 11 is a cylinder with an opening at one end. The top cover assembly 12 is connected to the opening of the shell 11. The top cover assembly 12 and the shell 11 form a closed space to accommodate other components of the battery.

[0049] In this embodiment, the housing 11 is preferably formed by stamping of stainless steel, which is strong and durable, and is easy to manufacture by stamping. Alternatively, the housing 11 may also be formed by stamping of other hardware materials.

[0050] See also Figure 2 In this embodiment, the button battery with a liquid injection hole further includes a battery core 13, which is located in the housing 11 and is used to store electric energy. The battery core 13 is a winding type, which is easy to weld and convenient for production control.

[0051] See also Figure 2 , Figure 5 and Figure 6 The battery cell 13 is provided with a first pole ear 131 and a second pole ear 132, which are used to extract the current of the battery cell 13 and transmit it to the positive and negative electrodes of the battery respectively. The first pole ear 131 connects the battery cell 13 to the support plate 129, and the second pole ear 132 connects the battery cell 13 to the housing 11. The connection method is laser welding. Laser welding is efficient and precise, and is particularly suitable for precision welding of micro and small parts.

[0052] In other embodiments, the welding of the second pole ear 132 and the shell 11 may be performed by bottom welding, resistance welding or double-needle welding. There is no tiny structure on the shell 11, and the requirement for welding precision is low, which is conducive to reducing costs.

[0053] The top cover assembly 12 includes an upper cover 121, an insulating member 122, a support plate 129, a boss 128 and a sealing nail 123. The upper cover 121, the insulating member 122 and the support plate 129 are all in the shape of annular sheets. The outer edge of the upper cover 121 is connected to the opening edge of the outer shell 11. The insulating member 122 is clamped between the support plate 129 and the upper cover 121, and the inner edge of the insulating member 122 protrudes from the inner edge of the upper cover 121; one end of the boss 128 is connected to the inner edge of the support plate 129, and the other end is passed through the hollow part of the insulating member 122; an injection hole 127 is provided on the boss 128, and the injection hole 127 connects the two ends of the boss 128; since the outer shell 11 is a cylinder with an opening at one end, the top cover assembly 12 is connected to the opening of the outer shell 11, and the two form a closed space to accommodate other components of the battery. The top cover assembly 12 includes an upper cover 121, an insulating member 122, a support plate 129, a boss 128 and a sealing pin 123. The insulating member 122 and the support plate 129 are both in the shape of an annular sheet. The outer edge of the upper cover 121 is connected to the opening edge of the housing 11 to form a closed space inside the housing 11. The insulating member 122 is clamped between the support plate 129 and the upper cover 121, and the inner edge of the insulating member 122 protrudes from the inner edge of the upper cover 121. The insulating member 122 is insulated and connected to the upper cover 121 and the support plate 129. The upper cover 121 is not in direct contact with the support plate 129, and one end of the boss 128 is connected to the inner edge of the support plate 129, and the other end is passed through the hollow part of the insulating member 122. The boss 128 is not in direct contact with the upper cover 121, and neither the support plate 129 nor the boss 128 is in direct contact with the upper cover 121, thereby ensuring polarity insulation of the battery; an injection hole 127 is provided on the boss 128, and the injection hole 127 connects the two ends of the boss 128, and electrolyte can be injected into the battery through the injection hole 127.

[0054] The sealing nail 123 includes a nail cap 124 and a nail column 125 connected to each other. The nail column 125 is sealed in the injection hole 127, and the nail cap 124 is welded to the boss 128. Since the nail column 125 is sealed in the injection hole 127, after the injection is completed, the nail column 125 can prevent the electrolyte from leaking out, and the nail cap 124 is welded to the boss 128, and the nail cap 124 and the boss 128 are tightly connected and not easy to fall off, and the nail column 125 is connected to the nail cap 124, and the nail column 125 is not easy to fall out of the injection hole 127, so as to ensure the sealing of the injection hole 127, thereby improving the sealing of the battery. In addition, the nail cap 124 can be connected to an electrical device, which changes the previous way of connecting the boss 128 to the electrical device.

[0055] See also Figure 7In this embodiment, the shape of the injection hole 127 is preferably circular. Fig.10 The nail column 125 is cylindrical, and the round shape does not need to consider the angle, which is convenient for alignment and for loading the nail column 125 into the injection hole 127. Alternatively, the injection hole 127 can also be square, polygonal or other special shapes, and correspondingly, the nail column 125 can also be square, polygonal or other special shapes.

[0056] In this embodiment, the upper cover 121, the insulating member 122, the boss 128 and the support plate 129 are connected after being laminated by hot pressing. The components after hot pressing are firmly connected, and the insulating member 122 has good sealing performance.

[0057] In this embodiment, the upper cover 121 is preferably made of stainless steel, which is strong and durable, or the upper cover 121 can also be made of other hardware materials.

[0058] The insulating member 122 is preferably a PP (polypropylene) composite film, or the insulating member 122 may also be a film made of other plastic materials.

[0059] The boss 128 and the support plate 129 are integrally formed, and the two are firmly connected. The boss 128 and the support plate 129 are preferably made of aluminum alloy, which is not easy to react with the residual electrolyte and is corrosion-resistant, or other hardware materials can be used.

[0060] In the radial direction of the outer shell 11, the outer edge of the boss 128 protrudes from the outer edge of the nail cap 124, and the outer edge of the nail cap 124 is welded to the boss 128 all around. The outer edge of the nail cap 124 is welded to the boss 128 in a circular manner, so that the outer edge of the nail cap 124 is firmly connected to the boss 128 all around, further preventing the nail cap 124 from falling off and ensuring the sealing of the battery. The nail cap 124 is sealed all around, and solder is not easy to enter the interior of the battery, avoiding pollution, which is beneficial to improving the quality of the battery.

[0061] The nail cap 124 is circular, and the boss 128 is a hollow cylindrical shape. The two are coaxially arranged, and the outer diameter of the boss 128 is 1.05-1.1 times the diameter of the nail cap 124. In order to facilitate the welding of the nail cap 124 and the boss 128, a certain space must be left between the edges of the two. If the outer diameter of the boss 128 is too large relative to the diameter of the nail cap 124, the size of the nail cap 124 is relatively small. The nail cap 124 is used to connect with electrical equipment, and the small size is not conducive to the transmission of battery current. If the outer diameter of the boss 128 is too small relative to the diameter of the nail cap 124, the gap between the outer edge of the boss 128 and the outer edge of the nail cap 124 is too small, and the space left for the circumferential welding of the outer edge of the nail cap 124 is too small, which is not conducive to operation and inconvenient production. Therefore, setting the outer diameter of the boss 128 to 1.05-1.1 times the diameter of the nail cap 124 is a preferred embodiment.

[0062] The nail cap 124 and the nail column 125 are both made of metal and are integrally formed. The metal material is strong and durable, and the integrally formed manufacturing method ensures that the nail cap 124 and the nail column 125 are firmly connected.

[0063] In this embodiment, the nail cap 124 and the nail column 125 are preferably made of aluminum alloy, which is not easy to react with residual electrolyte and is corrosion-resistant. Alternatively, they can be made of other hardware materials.

[0064] The nail column 125 and the injection hole 127 are interference fit, and elastic pressure is generated between the nail column 125 and the wall surface of the injection hole 127, which further improves the tightness of the connection between the nail column 125 and the injection hole 127, prevents the nail column 125 from falling off, and improves the sealing of the injection hole 127.

[0065] The outer peripheral surface of the boss 128 is cylindrical, and the injection hole 127 is circular. The two are coaxially arranged, and the outer diameter of the boss 128 is 3-4 times the aperture of the injection hole 127. If the outer diameter of the boss 128 is too large relative to the aperture of the injection hole 127, and the injection hole 127 is set too small, it is not convenient to align the injection tool with the injection hole 127 during injection, and the injection of the electrolyte will be too slow. If the outer diameter of the boss 128 is too small relative to the aperture of the injection hole 127, the side wall thickness of the boss 128 will be too thin, the structure of the boss 128 will be weak, and it will be easy to deform during injection. Therefore, setting the outer diameter of the boss 128 to 3-4 times the aperture of the injection hole 127 is a preferred embodiment.

[0066] In this embodiment, the injection hole 127 is arranged at the axis of the battery, and the wound battery cell 13 is hollow in the middle. The injection hole 127 is aligned with the hollow part of the battery cell 13 to avoid the battery cell 13 blocking the injection hole 127 and facilitate injection.

[0067] In the axial direction of the housing 11 and in the direction toward the inside of the housing 11, the inner end surface of the boss 128 protrudes from the nail column 125. In the axial direction of the housing 11, the size of the nail column 125 is shorter than the boss 128, so as to avoid the nail column 125 from contacting the battery cell 13, so as to avoid squeezing the battery cell 13 when the nail column 125 is installed into the injection hole 127, thereby damaging the structure of the battery cell 13.

[0068] See also Figure 3 and Figure 4 In the axial direction of the housing 11 and in the direction toward the outside of the housing 11, the outer surface of the upper cover 121 protrudes from the boss 128, and the outer surface of the nail cap 124 protrudes from the upper cover 121. In the axial direction of the housing 11, the boss 128 is shorter, so that the size of the entire battery is shorter, which is beneficial to improving the energy density of the battery; the nail cap 124 is used to connect with the electrical equipment, and the outer surface of the nail cap 124 is set to protrude from the upper cover 121, so that the nail cap 124 can be more protruding, which is convenient for the connection between the nail cap 124 and the electrical equipment.

[0069] See also Fig.11 In the present embodiment, a chamfered corner 1271 is provided on the inner wall of one end of the injection hole 127 facing the outside of the shell 11. The purpose is that if any electrolyte remains on the surface of the boss 128 during injection, the electrolyte can be guided along the chamfered corner 1271 to flow into the inner cavity of the shell 11 to avoid electrolyte residue. In addition, the aperture of the end provided with the chamfered corner 1271 is larger, which facilitates the insertion of the nail column 125 into the injection hole 127.

[0070] See also Figure 2 A limiting structure 111 is provided between the outer edge of the upper cover 121 and the opening edge of the shell 11. The limiting structure 111 includes a limiting portion 126. The limiting portion 126 surrounds the outer edge of the upper cover 121. In the axial direction of the shell 11 and in the direction close to the inside of the shell 11, the upper cover 121 protrudes from the limiting portion 126, and the portion of the upper cover 121 protruding from the limiting portion 126 is located inside the shell 11, and the limiting portion 126 abuts against the opening edge of the shell 11. When assembling the top cover assembly 12 and the shell 11, the limiting portion 126 can be positioned in the axial direction of the shell 11, and the portion of the upper cover 121 protruding from the limiting portion 126 can be positioned in the radial direction of the shell 11, so that the top cover assembly 12 and the shell 11 can be assembled accurately and conveniently to prevent assembly dislocation. After assembly dislocation, empty welding is very likely to occur. The limiting structure can effectively prevent poor welding, facilitate battery assembly, effectively improve assembly efficiency and manufacturing efficiency, and help meet market and customer needs.

[0071] When assembling the battery, proceed as follows: the upper cover 121, the insulating member 122, the boss 128 and the support plate 129 are combined into an integrated component, and after the combination, the upper cover 121, the boss 128 and the support plate 129 are all in a sealed and insulated state. Then the battery cell 13 is loaded into the inner cavity of the shell 11, and then the first pole ear 131 is welded to the support plate 129, and the second pole ear 132 is welded to the inner end face of the shell 11, and then the above-mentioned integrated component is loaded, and the outer edge of the upper cover 121 and the opening edge of the shell 11 are welded into one by laser welding. A limiting structure 111 is set between the outer edge of the upper cover 121 and the opening edge of the shell 11, which can effectively prevent the upper cover 121 and the shell 11 from relative eccentric displacement, so that the two can be accurately assembled, and the structural performance is reliable. Then the electrolyte is injected through the injection hole 127. Finally, the nail column 125 is installed into the injection hole 127, and then the nail cap 124 and the boss 128 are laser welded together to finally form a battery with a sealed structure.

[0072] See also Fig.12The second embodiment of the utility model provides a button battery with a liquid injection hole. The structure of its top cover assembly 22 and the shell 21 is the same as that of the first embodiment above, and will not be repeated here. The difference is that in this embodiment, the battery cell 23 is a stacked type. The stacked battery cell has a high energy density and a flexible volume, which is easy to package.

[0073] See also Fig.13 The third embodiment of the utility model provides a button battery with a liquid injection hole. The structures of its shell, battery cell, insulating member, boss, support plate, and sealing nail are the same as those of the first embodiment, and will not be repeated here. The difference is that, in this embodiment, a groove 323 is provided on the surface of the upper cover 321 facing the inner side of the shell, and the insulating member 322 is located in the groove 323. The groove 323 limits the insulating member 322, which can prevent the insulating member 322 from being eccentric. The thickness of the top cover assembly becomes thinner, the size of the battery is further shortened, and the energy density of the battery is further improved.

[0074] In this embodiment, the groove 323 is formed by punching, cutting or CNC processing of the upper cover 321, which will not cause protrusions on the surface of the upper cover 321, and the other side of the upper cover 321 is still a flat surface.

[0075] The edge of the insulating member 322 is flush with the edge of the groove 323 , and the insulating member 322 and the upper cover 321 are more integrated.

[0076] In other embodiments, the thickness of the insulating member may also be smaller than the depth of the groove, and part of the support plate may also be located in the groove, further reducing the thickness of the top cover assembly.

[0077] See also Fig.14 The fourth embodiment of the utility model provides a button battery with a liquid injection hole. The structures of its upper cover, insulating member, boss, support plate, shell and battery cell are the same as those of the first embodiment, which will not be repeated here. The difference is that, in this embodiment, a sealing ring 426 is provided on the outer peripheral surface of the nail column 425, and the nail column 425 and the liquid injection hole are sealed by the sealing ring 426. At the same time, the nail cap 424 is welded to the boss, and double sealing is performed to further improve the sealing performance at the liquid injection hole.

[0078] See also Fig.15The fifth embodiment of the utility model provides a button battery with a liquid injection hole. The structure of the sealing pin, insulating member, boss, support plate and battery cell is the same as that of the first embodiment, and will not be repeated here. The difference is that in this embodiment, the limiting structure 511 includes a limiting portion 526 arranged on the upper cover 521 and a clamping portion 527 arranged on the shell 51. The clamping portion 527 surrounds the outer edge of the shell 51. In the radial direction of the shell 51 and in the direction of the inside of the shell 51, the inner wall of the shell 51 protrudes from the clamping portion 527, and the part of the upper cover 521 protruding from the limiting portion 526 abuts against the side wall of the shell 51, and the limiting portion 526 abuts against the clamping portion 527. During assembly, the limiting portion 526 can be positioned in the axial upper limit of the shell 51, and the clamping portion 527 can be positioned in the radial upper limit of the shell 51, so that it can be assembled conveniently and accurately, and the assembly dislocation phenomenon is prevented. The battery assembly is convenient, and the manufacturing efficiency is effectively improved, which is conducive to meeting the market and customer needs.

[0079] See also Fig.16 The sixth embodiment of the utility model provides a button battery with a liquid injection hole. The structure of its shell, battery cell, insulating member, boss, support plate, and sealing nail is the same as that of the fifth embodiment, and will not be repeated here. The difference is that in this embodiment, the limiting structure 611 includes a clamping portion 627 provided on the shell 61, and the edge of the upper cover 621 is not provided with a limiting portion, which simplifies the structure of the upper cover and facilitates manufacturing. During assembly, the part of the side wall of the shell 61 protruding from the clamping portion 627 can be positioned in the axial upper limit of the shell 61, and the clamping portion 627 can be positioned in the radial upper limit of the shell 61, so that it can be assembled accurately and conveniently to prevent assembly dislocation. The battery is easy to assemble, which effectively improves the manufacturing efficiency and is conducive to meeting market and customer needs.

[0080] See also Fig.17 The seventh embodiment of the utility model provides a button battery with a liquid injection hole. The structures of its shell, battery cell, insulating member, boss, support plate, and sealing nail are the same as those of the first embodiment, and will not be repeated here. The difference is that in this embodiment, no limiting structure is set between the outer edge of the upper cover 721 and the opening edge of the shell 71, which simplifies the structure of the upper cover 721 and the shell 71 and facilitates manufacturing.

[0081] In summary, although the present invention has been disclosed as above by the above embodiments, the above embodiments are not intended to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A button battery with a liquid injection hole, characterized in that: It comprises a shell and a top cover assembly, wherein the shell is in a cylindrical shape with one end open, and the top cover assembly is connected to the opening of the shell; The top cover assembly comprises an upper cover, an insulating member, a support plate, a boss and a sealing nail, wherein the upper cover, the insulating member and the support plate are all in the shape of an annular sheet, the outer edge of the upper cover is connected to the opening edge of the shell, the insulating member is clamped between the support plate and the upper cover, and the inner edge of the insulating member protrudes from the inner edge of the upper cover; one end of the boss is connected to the inner edge of the support plate, and the other end is passed through the hollow part of the insulating member; an injection hole is provided on the boss, and the injection hole communicates with both ends of the boss; The sealing nail comprises a nail cap and a nail column which are connected to each other. The nail column is sealed in the injection hole, and the nail cap is welded to the boss.

2. The button battery with a liquid injection hole according to claim 1, characterized in that: In the radial direction of the shell, the outer edge of the boss protrudes beyond the outer edge of the nail cap, and the outer edge of the nail cap is welded to the boss all around.

3. The button battery with a liquid injection hole according to claim 2, characterized in that: The nail cap is circular, and the boss is hollow cylindrical, and the two are coaxially arranged. The outer diameter of the boss is 1.05-1.1 times the diameter of the nail cap.

4. The button battery with a liquid injection hole according to claim 1, characterized in that: The nail cap and the nail column are both made of metal and are integrally formed.

5. The button battery with a liquid injection hole according to claim 1, characterized in that: A sealing ring is arranged between the outer peripheral surface of the nail column and the injection hole.

6. The button battery with a liquid injection hole according to claim 1, characterized in that: The nail column is interference fit with the injection hole.

7. The button battery with a liquid injection hole according to claim 1, characterized in that: The outer peripheral surface of the boss is cylindrical, and the injection hole is circular, and the two are coaxially arranged. The outer diameter of the boss is 3-4 times the hole diameter of the injection hole.

8. The button battery with a liquid injection hole according to claim 1, characterized in that: In the axial direction of the housing and in the direction toward the inside of the housing, the inner end surface of the boss protrudes from the nail column.

9. The button battery with a liquid injection hole according to claim 1, characterized in that: In the axial direction of the shell and in the direction outward of the shell, the outer surface of the upper cover protrudes from the boss, and the outer surface of the nail cap protrudes from the upper cover.

10. The button battery with a liquid injection hole according to any one of claims 1 to 9, characterized in that: A limiting structure is arranged between the outer edge of the upper cover and the opening edge of the shell.

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