Fully-sealed button cell and medical electric equipment

Abstract

The utility model discloses a full-sealed button cell and medical electric equipment. The full-sealed button cell comprises a cover group, a shell and a hole plugging piece, the shell is provided with a groove-shaped containing cavity with an opening, the cover set comprises a pole, an insulator and a cover set body, at least part of the pole is located in the containing cavity, a horn hole is formed in the cover set body, the pole penetrates through the horn hole, part of the pole is located outside the battery, and the pole is in insulation connection with the hole wall of the horn hole through the insulator. The pole is insulated from the inner wall of the cavity in the battery; the cover group covers the opening and is seamlessly welded to form an internal cavity of the battery; an upper insulating sheet, a battery core bag, a tab insulating tape, electrolyte and a lower insulating sheet are sequentially arranged in a cavity in the battery from top to bottom; the battery core bag comprises a positive pole piece, a diaphragm and a negative pole piece, the positive pole piece and the negative pole piece are mutually wrapped or alternately overlapped, and the diaphragm is arranged between the positive pole piece and the negative pole piece.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery technical field, relate to the design and manufacture of the battery used in the medical and health field such as endoscope capsule, human contact (insert) type medical instrument or medical robot and so on, and the battery use in the related field of high safety, extreme environment, harsh use condition, long storage period. BACKGROUND

[0002] The miniaturization, high specific energy, high safety and high reliability of the battery used in the medical and health field such as endoscope capsule, human contact (insert) type medical instrument or medical robot are one of the difficulties of the miniaturization and multifunction of medical and health instrument.

[0003] The traditional full-sealed endoscope capsule battery guarantees the reliability and effectiveness of insulator sintering by thickening the cover group body, reduces the internal space of the battery, and the cover group body is provided with a liquid injection hole, which restricts the capacity increase and structure miniaturization of the battery to a certain extent;Adopting button cell, the insulator is made of silicone, resin or modified Teflon (PFA) plastic material, and there are safety risks such as electrolyte leakage, electrical performance decline and even failure in long-term storage for more than 5 years (including).

[0004] Focusing on the practical problems and development bottleneck of endoscope capsule, human contact (insert) type medical instrument or medical robot, a full-sealed button cell is developed to meet the demand of button cell in the field of medical and health, big health, high safety, extreme environment, harsh use condition and long storage period. UTILITY MODEL CONTENTS

[0005] The utility model aims at the miniaturization and multifunctional development demand of endoscope capsule, human contact (insert) type medical instrument or medical robot, develops a kind of high safety, high specific energy, miniaturized full-sealed battery, and forms serialization, to meet the demand of battery in the field of medical and health, big health, high safety, extreme environment, harsh use condition and long storage period.

[0006] The utility model also relates to the structure and application of full-sealed battery, and realizes the utility model purposes by adopting the following technical schemes.

[0007] Firstly, the utility model provides a kind of full-sealed button cell, including cover group, shell and plug hole piece, and two two mutually cooperate according to design processing tolerance, and weld sealing forms the internal cavity of battery, and the internal cavity of battery is sequentially equipped with upper insulating sheet, battery core package, tab insulating tape, electrolyte and lower insulating sheet from top to bottom.

[0008] The cover group includes pole, insulator and cover group body, and is made into circular, rectangular, square, polygon or special-shaped combination by sintering;Preferably, the battery pole envelope diameter is 4mm-9.8mm.

[0009] The cover assembly body has a flared hole formed at its center through mechanical processing such as stretching and stamping. The flared hole is located within the housing, and the poles pass through the flared hole, with some poles located outside the housing. The poles are connected to the inner wall of the flared hole via insulators, and the poles are insulated from the cover assembly body and the inner wall of the housing. Preferably, the outer diameter of the flared hole is 0.7 mm to 4.5 mm.

[0010] The insulator is a glass body with weather resistance, resistance to hydrofluoric acid corrosion and electrochemical corrosion, and insulation properties. It balances the thermal and structural stresses caused by the different coefficients of thermal expansion and contraction of the different materials of the pole, the insulator, and the cover assembly body. Furthermore, the cover assembly body and the pole are formed by melting the glass body into the gap between the pole and the horn hole of the cover assembly body, cooling and solidifying to bond the pole and the cover assembly body. This ensures that the pole and the hole wall of the horn hole are insulated and reliably connected, thereby improving the battery sealing reliability and thus enhancing the battery's storage life, environmental adaptability, and safety in use.

[0011] The electrode post has a diameter of 0.3mm to 4mm and is made of any one of Kovar alloy, copper, aluminum alloy, or stainless steel. Preferably, it is made of any one of Kovar alloy or stainless steel.

[0012] The housing is machined by stretching, stamping, or other mechanical processes into a cylindrical, prismatic, or irregularly shaped cavity with an opening, consisting of a diameter of 4mm to 9.8mm and a height of 4mm to 8.5mm. The cover assembly closes to the opening. A plugging groove and an injection hole are formed at the bottom of the housing. Preferably, the housing of the wound battery cell pack is cylindrical, while the housing of the disc-type battery cell pack is cylindrical, prismatic, or irregularly shaped. The size of the groove is determined based on the external dimensions of the plugging component.

[0013] The plugging component is machined by stamping, etching, or other mechanical processes to create explosion-proof markings on one of its planes. Preferably, the depth of the explosion-proof markings is 1 / 3 to 1 / 2 of the thickness of the plugging component.

[0014] Optionally, according to the application of this fully sealed button battery and related standards, the cover body, the shell, and the plug are made of stainless steel, aluminum alloy, titanium alloy, or coated metal that meet the relevant standards for food contact metal materials and products. Preferably, the material is stainless steel or titanium alloy with a thickness of 0.05mm to 0.5mm.

[0015] The battery pack includes a positive electrode sheet, a separator, a negative electrode sheet, and an insulating strip for the tabs. After being manufactured by one of the methods of winding or stacking, the insulating strip for the tabs is wrapped around the non-welded parts of the positive electrode tab and the negative electrode tab.

[0016] Furthermore, the positive electrode sheet is prepared by mixing an active material, conductive agent, and binder in a ratio of 85.5%–94.8%: 4%–10%: 1.2%–4.5%, and then coating or rolling it onto the positive current collector. The resulting sheet is then slitting or die-cut into one of the following shapes: strip, circle, quadrilateral, polygon, or irregular shape. Preferably, the active material is at least one of manganese dioxide, carbon fluoride, silver vanadate, or metal oxide.

[0017] The adhesive is at least one of sodium polyacrylate, sodium carboxymethyl cellulose, polytetrafluoroethylene emulsion, rubber emulsion, acrylic homopolymer, polyvinyl alcohol, acrylonitrile copolymer, and conductive polymer adhesive.

[0018] The positive electrode current collector is one of aluminum foil, aluminum mesh, 304 stainless steel foil, 316 stainless steel foil, 304 stainless steel mesh, and 316 stainless steel mesh. Preferably, when the manganese ion-containing active material slurry is applied by coating, the current collector is one of 304 stainless steel foil, 316 stainless steel foil, 304 stainless steel mesh, and 316 stainless steel mesh.

[0019] The slitting or die-cutting process produces a strip shape, a circle shape, a quadrilateral shape, a polygon shape, or an irregular shape. Preferably, the positive electrode sheet of the wound battery cell pack is strip-shaped, and the positive electrode sheet of the stacked battery cell pack is a circle shape, a quadrilateral shape, a polygon shape, or an irregular shape.

[0020] The separator is any one of a separator with a single-sided or double-sided coating, or a PEP separator, and is formed in a strip roll or a tubular roll. The positive electrode or the negative electrode is separated by one of the following methods: wrapping, inserting into a tube, or hot-pressing to fuse the edges into a bag. Preferably, the separator with a single-sided or double-sided coating has a coating comprising at least one of boehmite, a polymer, or a gel electrolyte.

[0021] Furthermore, the wrapping involves placing a strip-shaped separator between the positive and negative electrode sheets by winding or stacking (Z-shaped); the tubing involves inserting the positive or negative electrode sheet into a tubular separator and then forming a battery pack by winding or stacking; the hot-pressing edge-sealing bag-making involves cutting the strip-shaped separator into electrode sheet shapes, hot-pressing the edges to cover the positive or negative electrode sheets, and the hot-pressed fused edges extending 0.5mm to 3mm beyond the edge of the electrode sheet.

[0022] The negative electrode sheet is made of either lithium metal or a lithium-copper composite, and is slit or die-cut into strip, round, quadrilateral, polygonal, or irregular shapes after being coated with a release film. Preferably, a lithium-copper composite is used, that is, a layer of lithium metal is formed on the surface of copper foil by rolling or electroplating to form a lithium-copper composite sheet with a supporting structure.

[0023] Furthermore, the slitting or die-cutting is made into one of the following shapes: strip, circle, quadrilateral, polygon, or irregular shape. Preferably, the negative electrode sheet of the wound battery cell pack is strip-shaped, and the negative electrode sheet of the disc-type battery cell pack is one of the following shapes: circle, quadrilateral, polygon, or irregular shape, and its shape is consistent with that of the positive electrode sheet.

[0024] The insulating tape for the electrode tabs is either polypropylene tape or polyimide tape, and it covers the non-welded portion of the positive or negative electrode tab to prevent short circuits between the positive or negative electrode and the inner wall of the battery cavity. Preferably, the insulating tape for the electrode tabs is polypropylene tape.

[0025] The electrolyte contains additives that suppress gas generation in the corresponding electrochemical system battery. It is injected using a limited quantitative method, and the amount of free electrolyte is 0-5% of the pore volume of the battery cell.

[0026] Furthermore, the fully sealed button battery of this utility model features a cylindrical or prismatic metal casing with an extreme envelope diameter of 4mm to 9.8mm and a height of 4mm to 8.5mm. Preferably, according to the principle of prioritizing battery energy capacity, the following are the preferred electrode diameters for the same height: 8.8mm to 9.8mm extreme envelope diameter, 0.3mm to 4mm; 7.8mm to 8.8mm extreme envelope diameter, 0.3mm to 3mm; 6.8mm to 7.8mm extreme envelope diameter, 0.3mm to 2mm; 5.8mm to 6.8mm extreme envelope diameter, 0.3mm to 1mm; 4.8mm to 5.8mm extreme envelope diameter, 0.3mm to 0.5mm; and 4.0mm to 4.8mm extreme envelope diameter, less than 0.3mm.

[0027] Secondly, this utility model provides a medical electrical device, which includes the fully sealed battery described in any one of the first aspects above.

[0028] In this embodiment of the invention, the positive and negative electrode plates wrap around or alternately stacked, with a separator between them. Therefore, the separator isolates the positive and negative electrode plates, preventing them from conducting and causing a short circuit inside the button cell. The cover assembly has a flared hole located inside the casing, through which the electrode posts pass, with some posts located outside the casing. This allows the external electrode posts to connect to other components, enabling the electrical energy of the fully sealed battery to be transferred to other components. Furthermore, the insulator is made of glass and sintered between the electrode posts and the flared hole, achieving a permanent and reliable seal, completely isolating the inside and outside of the battery and preventing electrolyte leakage that could affect the safety of the fully sealed battery. Each positive electrode plate has at least one positive tab, and each negative electrode plate has at least one negative tab. The positive tab connects to the inner wall of the casing or the cover assembly, while the negative tab connects to the electrode post. Therefore, the negative electrode is connected to the terminal post, the positive electrode is connected to the inner wall of the casing through the positive electrode tab, and the terminal post is insulated from the inner wall of the horn hole. The terminal post and the casing are also insulated from each other, thus ensuring that the positive and negative electrode are insulated from each other, avoiding short circuits inside the battery, improving the safety of the fully sealed battery, and allowing the fully sealed battery to transmit electrical energy normally through the terminal post.

[0029] Furthermore, the insulator is sintered between the terminal post and the horn hole; after the battery cell is packaged into the housing, the positive electrode tab and the negative electrode tab are welded to the inner wall of the housing and the lower end face of the terminal post, respectively; after the cover assembly is closed onto the opening of the housing, the cover assembly body is welded to the housing; after the battery is injected with electrolyte, the plugging component is installed into the plugging groove and welded. Therefore, a fully sealed structure is formed, which can improve the battery's storage life, environmental adaptability, reliability, and safety. Materials conforming to relevant standards for food contact metal materials and products are used, improving battery safety and hygiene standards. In other words, in this embodiment of the invention, the fully sealed button battery can meet multiple requirements.

[0030] The cover assembly adopts a flared hole structure, which reduces the thickness of the cover assembly and increases the internal space of the battery. This results in a more than 10% increase in discharge capacity for batteries with the same envelope diameter and height. It also facilitates the miniaturization, serialization, and standardization of primary battery models for endoscope capsules, human contact (implantation) medical devices, or medical robots. Based on the battery's extreme envelope diameter tolerances, a fully sealed button battery is classified into the 93 series (9.3mm±0.5mm), 83 series (8.3mm±0.5mm), 73 series (7.3mm±0.5mm), 63 series (6.3mm±0.5mm), 53 series (5.3mm±0.5mm), and 43 series (4.3mm±0.5mm). Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of the battery structure of this utility model.

[0033] Figure 2 This is a schematic diagram of the battery cover assembly structure of this utility model.

[0034] Figure 3 This is a schematic diagram of the battery casing structure of this utility model.

[0035] Figure 4 This is a schematic diagram of the battery plugging component of this utility model.

[0036] Figure 5 This is a discharge curve diagram of an embodiment of the present invention.

[0037] Reference numerals: 100-cover assembly, 101-pole post, 102-insulator, 103-cover assembly body, 200-upper insulating sheet, 300-diaphragm, 400-positive pole piece, 401-positive pole tab, 500-negative pole piece, 501-negative pole tab, 600-lower insulating sheet, 700-hole plugging component, 701-explosion-proof scratch, 800-shell, 801-hole plugging groove, 802-liquid injection hole, 900-pole tab insulating tape. Detailed Implementation

[0038] To facilitate a clear description of the technical solutions of the embodiments of this utility model, the terms "first" and "second" are used in the embodiments of this utility model to distinguish identical or similar items with essentially the same function and effect. For example, the first threshold and the second threshold are only used to distinguish different thresholds and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0039] It should be noted that in this utility model, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in this utility model should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0040] In this invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c; a combination of a and b; a combination of a and c; b and c; or a combination of a, b, and c, where a, b, and c can be single or multiple.

[0041] This utility model embodiment provides a fully sealed button battery, such as Figures 1 to 4 As shown, the fully sealed button cell includes: a cover assembly 100, a casing 800, multiple positive electrode plates 400, and multiple negative electrode plates 500.

[0042] The housing 800 has an open, groove-shaped receiving cavity, and the cover assembly 100 closes to the opening. Multiple positive electrode plates 400 and multiple negative electrode plates 500 are located within the receiving cavity, and the positive electrode plates 400 and negative electrode plates 500 are wrapped together to form a cylindrical battery cell pack. A separator 300 is provided between the positive electrode plates 400 and the negative electrode plates 500 to isolate them. The cover assembly 100 includes electrode posts 101 and a cover assembly body 103. The cover assembly body 103 closes to the opening of the housing 800, and at least a portion of the electrode posts 101 are located within the receiving cavity. The body 103 is provided with a horn hole, which is located in the housing 800. The pole post 101 passes through the horn hole, and part of the pole post 101 is located outside the housing 800. The pole post 101 is connected to the inner wall of the horn hole by an insulator, and the pole post 101 is insulated from the inner wall of the housing 800. Each positive pole piece 400 has at least one positive pole tab 401, and each negative pole piece 500 has at least one negative pole tab 501. The positive pole tab 401 is connected to the inner wall of the housing 800 or the cover body 103, and the negative pole tab 501 is connected to the pole post 101.

[0043] In this embodiment of the invention, the positive electrode 400 and the negative electrode 500 are wrapped around each other, and a separator 300 is provided between them. Therefore, the separator 300 can isolate the positive electrode 400 and the negative electrode 500, preventing them from conducting and causing a short circuit inside the fully sealed coin cell. Since the cover body 103 has a horn hole located in the housing 800, the terminal post 101 passes through the horn hole, with some of the terminal post 101 located outside the housing 800. Therefore, the portion of the terminal post 101 located outside the housing 800 can connect to other components, allowing the electrical energy of the coin cell to be transferred to other components through the terminal post 101. Furthermore, the insulator 102, made of glass, is sintered between the terminal post and the horn hole, achieving a permanent and reliable seal, meaning the inside and outside of the battery are completely isolated, preventing electrolyte leakage and ensuring the safety of the fully sealed battery. Since each positive electrode 400 has at least one positive electrode tab 401 and each negative electrode 500 has at least one negative electrode tab 501, the positive electrode tab 401 is electrically connected to the inner wall of the casing 800 or the cover assembly body 103, and the negative electrode tab 501 is electrically connected to the terminal post 101. Therefore, the negative electrode 500 is connected to the terminal post 101, the positive electrode 400 is connected to the inner wall of the casing 800 through the positive electrode tab 401, and the terminal post 101 is insulated from the inner wall of the horn hole of the cover assembly body 103, and the terminal post 101 is insulated from the inner wall of the casing 800. This ensures that the positive electrode 400 and the negative electrode 500 are insulated from each other, avoiding internal short circuits in the battery, improving the safety of the fully sealed battery, and allowing the fully sealed battery to normally transmit electrical energy through the terminal post 101.

[0044] In addition, the insulator 102 is sintered between the terminal post and the horn hole; after the cylindrical battery cell is packaged into the housing 800, the positive electrode tab 401 and the negative electrode tab 501 are welded to the inner wall of the housing 800 and the lower end face of the terminal post 101, respectively; after the cover assembly 100 is closed on the opening of the housing 800, the cover assembly body 103 is welded to the housing 800; after the battery is injected with electrolyte, the plugging component 700 is installed into the plugging groove 801 and welded. Therefore, a fully sealed structure is formed, which can improve the battery's storage life, environmental adaptability, reliability, and safety. Materials that meet the relevant standards for food contact metal materials and products are used, improving the battery's safety and hygiene standards. In other words, in this embodiment of the invention, the fully sealed button battery can meet various requirements.

[0045] It should be noted that in this embodiment of the invention, each positive electrode 400 can be connected to a positive electrode tab 401, or each positive electrode 400 can be connected to multiple positive electrode tabs 401. This is not limited in this embodiment. Alternatively, in this embodiment, the positive electrode 400 itself can also serve as a positive electrode tab 401. Similarly, each negative electrode 500 can be connected to a negative electrode tab 501, or each negative electrode 500 can be connected to multiple negative electrode tabs 501. This is not limited in this embodiment. Furthermore, in this embodiment, the negative electrode 500 itself can also serve as a positive electrode tab 301. When each positive electrode 400 is connected to multiple positive electrode tabs 401 and each negative electrode 500 is connected to multiple negative electrode tabs 501, this is equivalent to a multi-tab configuration in a fully sealed button cell. When the positive electrode 400 itself acts as the positive electrode tab 401 and the negative electrode 500 itself acts as the positive electrode tab 301, this is equivalent to a full-tab configuration in a fully sealed button cell.

[0046] Furthermore, in this embodiment of the invention, the shell 800 can be made of metal, meaning it is formed by metal processing. The material of the shell 800 can include, but is not limited to, stainless steel, aluminum alloy, titanium alloy, and plated metal, all conforming to relevant standards for food contact metal materials and products. Additionally, when the shell 800 is made of stainless steel or titanium alloy, its thickness can be any value between 0.05mm and 0.3mm. For example, the thickness of the shell 800 is 0.05mm, 0.1mm, or 0.3mm.

[0047] In addition, in this embodiment of the utility model, a horn hole is provided on the cover body 103. Therefore, the pole post 101 can pass through the horn hole on the cover body 103, and the positive pole tab 401 is electrically connected to the housing 800, or the positive pole tab 401 is connected to the cover body 103. The pole post 101 is connected to the inner wall of the horn hole of the cover body 103 through an insulator 102. The pole post 101 and the cover body 103 are mutually insulated, thereby ensuring that the positive pole plate 400 and the negative pole plate 500 are mutually insulated, avoiding the problem of short circuit inside the button cell caused by the positive pole plate 400 and the negative pole plate 500 being connected.

[0048] It should be noted that the positive electrode tab 401 can be welded to the housing 800, thereby connecting the positive electrode tab 401 to the housing 800; the positive electrode tab 401 can also be welded to the cover assembly body 103, thereby connecting the positive electrode tab 401 to the cover assembly body 103. Additionally, the negative electrode tab 501 can be welded to the terminal post 101, thereby connecting the negative electrode tab 501 to the terminal post 101.

[0049] In addition, in some embodiments, the fully sealed button battery also includes a plugging component 700. The bottom of the housing 800 opposite to the cover body 103 has a plugging groove 801. An injection hole 802 is provided in the plugging groove 801 and the injection hole 802 penetrates the bottom of the housing 800. The plugging component 700 is located in the plugging groove 801 and the plugging component 700 covers the injection hole 802.

[0050] Because the bottom of the casing 800 has a plugging groove 801, and the plugging groove 801 is provided with an injection hole 802, electrolyte can be injected into the receiving cavity of the casing 800 through the injection hole 802, thereby causing an electrochemical reaction between the positive electrode 400, the negative electrode 500, and the electrolyte in the receiving cavity to generate electrical energy. Since the plugging component 700 is located in the plugging groove 801 and the plugging component 700 covers the injection hole 802, the injection hole 802 can be sealed by the plugging component 700 after the electrolyte is injected, preventing electrolyte leakage from the injection hole 802. In addition, the plugging component 700 is located in the plugging groove 801, and the plugging component 700 can also be flush with the outer surface of the bottom of the casing 800, thereby preventing the plugging component 700 from protruding from the bottom of the casing 800, which would lead to problems that are not conducive to the promotion and application of button batteries. In this embodiment of the invention, by providing an injection hole 802 in the plugging groove 801 and the plugging component 700 being located in the plugging groove 801, it is convenient to inject electrolyte into the fully sealed button battery, and the application range of the fully sealed button battery can be expanded.

[0051] It should be noted that the material of the plug 700 can be the same as the material of the bottom of the housing 800, that is, the plug 700 can be formed by processing metal.

[0052] In addition, in some embodiments, the plug 700 is provided with explosion-proof scratches 701 on the surface away from the cover assembly body 103.

[0053] Because the bottom of the casing 800 is provided with explosion-proof scratches 701 on the surface opposite to the cover body 103, if the temperature or air pressure inside the casing 800 is too high, causing the button battery to explode, the plug 700 will be damaged first at the explosion-proof groove, thereby releasing the air pressure inside the casing 800, preventing the fully sealed button battery from exploding, and thus improving the safety performance of the fully sealed button battery.

[0054] It should be noted that the shape of the explosion-proof scratch 701 can be set according to actual needs. For example, the shape of the explosion-proof scratch 701 can be cross-shaped, or it can be circular. The specific shape of the explosion-proof scratch 701 is not limited in this embodiment. Furthermore, the depth of the explosion-proof scratch 701 can be 1 / 3 to 1 / 2 of the thickness of the plug 700.

[0055] In addition, in this embodiment of the invention, the electrolyte injection hole 802 can be located in the middle of the bottom of the housing 800, so that when electrolyte is injected through the electrolyte injection hole 802, the electrolyte can be distributed more evenly in the housing 800. Furthermore, the plugging component 700 can also be located in the middle of the bottom of the housing 800, so that when the internal pressure of the fully sealed button battery is too high, the plugging component 700 will experience greater force, and the explosion-proof scratch 701 is located on the plugging component 700, which facilitates the plugging component 700 being damaged at the explosion-proof scratch 701, thereby releasing pressure.

[0056] In some embodiments, the button cell may also include an upper insulating sheet 200 and a lower insulating sheet 600; both the upper insulating sheet 200 and the lower insulating sheet 600 are located in the receiving cavity, and the upper insulating sheet 200 is disposed on the cover body 103, with a portion of the upper insulating sheet 200 located between the terminal post 101 and the cover body 103, and the lower insulating sheet 600 is disposed at the bottom of the housing 800; the positive electrode 400, the negative electrode 500, and the separator 300 are located between the upper insulating sheet 200 and the lower insulating sheet 600.

[0057] Because the upper insulating sheet 200 is disposed on the cover assembly body 103, and part of the upper insulating sheet 200 is located between the terminal post 101 and the cover assembly body 103, the presence of the upper insulating sheet 200 can effectively ensure that when the positive electrode 400 and / or the negative electrode 500 shake inside the housing 800, the positive electrode 400 and / or the negative electrode 500 directly contact the cover assembly body 103, causing the positive electrode 400 and the negative electrode 500 to conduct, thereby causing a short circuit inside the fully sealed button cell. In addition, the lower insulating sheet 600 is disposed at the bottom of the housing 800. Therefore, the presence of the lower insulating sheet 600 effectively ensures that when the positive electrode 400 and / or the negative electrode 500 move inside the casing 800, they do not directly contact the bottom of the casing 800, preventing the positive electrode 400 and negative electrode 500 from conducting and thus causing a short circuit inside the fully sealed coin cell. In other words, by setting the upper insulating sheet 200 and the lower insulating sheet 600, the safety of the fully sealed coin cell can be effectively improved.

[0058] In some embodiments, the negative electrode tab 501 is wrapped with the tab insulating tape 900. This arrangement allows the tab insulating tape 900 to provide insulation for the negative electrode tab 501, preventing it from contacting the positive electrode plate 400 and / or the casing 800 during shaking and causing a short circuit, thus improving the safety of the button cell battery.

[0059] In some embodiments, the cover assembly 100 may also include an insulator 102. The insulator 102 is a glass body, sintered and solidified between the inner wall of the horn hole of the cover assembly body 103 and the terminal post 101, so that the terminal post 101 and the cover assembly body 103 are insulated and sealed together. Since the insulator 102 is solidified between the inner wall of the horn hole of the cover assembly body 103 and the terminal post 101, and is a glass body with good weather resistance, resistance to hydrofluoric acid corrosion and electrochemical corrosion, the terminal post 101 is insulated from the cover assembly body 103 and the shell 800. Furthermore, the insulator 102 has a long service life and good weather resistance, resistance to hydrofluoric acid corrosion and electrochemical corrosion, thus extending the service life of the coin cell and improving the sealing reliability of the coin cell, thereby improving the storage life, environmental adaptability, and reliability of the coin cell. In other words, by setting insulator 102, it can be effectively ensured that the pole post 101 is insulated from the housing 800 and the cover assembly body 103, and the presence of insulator 102 extends the life of the button cell.

[0060] It should be noted that, in this embodiment of the invention, the electrode post 101 can be formed of a metal material, wherein the metal material forming the electrode post 101 includes, but is not limited to, Kovar alloy, copper, silver alloy, etc. Furthermore, the diameter of the electrode post 101 ranges from 0.3mm to 4mm, and can be any value within this range. For example, the diameter of the electrode post 101 can be 0.3mm, or 1mm, 2mm, or 4mm.

[0061] In addition, in this embodiment of the utility model, the extreme envelope diameter of the fully sealed button battery can range from 8.8mm to 9.8mm, in which case the diameter of the terminal 101 can range from 0.3mm to 4mm; when the extreme envelope diameter ranges from 7.8mm to 8.8mm, the diameter of the terminal 101 can range from 0.3mm to 3mm; when the extreme envelope diameter ranges from 6.8mm to 7.8mm, the diameter of the terminal 101 can range from 0.3mm to 2mm; when the extreme envelope diameter ranges from 5.8mm to 6.8mm, the diameter of the terminal 101 can range from 0.3mm to 1mm; when the extreme envelope diameter ranges from 4.8mm to 5.8mm, the diameter of the terminal 101 can range from 0.3mm to 0.5mm; and when the extreme envelope diameter ranges from 4.0mm to 4.8mm, the diameter of the terminal 101 can be 0.3mm.

[0062] In some embodiments, the fully sealed coin cell may also include an electrolyte located in a containment cavity. The electrolyte contains additives to suppress gas generation, specifically to inhibit the production of hydrogen and / or hydrogen fluoride. This design effectively prevents gas generation inside the coin cell, thus avoiding the problem of bulging and improving its safety.

[0063] In some embodiments, the positive electrode 400 may include a positive current collector, on which an electrode layer is disposed. The electrode layer comprises an active material, a conductive agent, and an aqueous binder, wherein the mass ratio of the active material, conductive agent, and aqueous binder is 85wt%–94.8wt% : 4wt%–10wt% : 1.2wt%–5wt%. The active material includes at least one of manganese dioxide, fluorocarbon, fluorocarbon modified materials, and metal oxides. The aqueous binder includes at least one of sodium polyacrylate, sodium carboxymethyl cellulose, rubber latex, acrylic homopolymer, polyvinyl alcohol, acrylonitrile copolymer, and conductive polymer binder. This configuration allows the positive electrode 400 to operate effectively and stably, and also extends its shelf life.

[0064] It should be noted that, in this embodiment of the invention, the positive electrode current collector may include, but is not limited to, aluminum foil, aluminum mesh, 304 / 316 stainless steel foil, 304 / 316 stainless steel mesh, etc. When the active material includes manganese dioxide, and a coating method is used, the positive electrode current collector may be either 304 / 316 stainless steel foil or 304 / 316 stainless steel mesh.

[0065] Furthermore, in this embodiment of the invention, the positive electrode sheet 400 can be manufactured by die-cutting or slitting processes, thus the shape of the positive electrode sheet 400 includes, but is not limited to, strip, circle, quadrilateral, polygon, and irregular shape. Additionally, for wound battery packs, the positive electrode sheet 400 can be strip-shaped; for stacked battery packs, the positive electrode sheet 400 can be one of circle, quadrilateral, polygon, or irregular shape.

[0066] Additionally, in some embodiments, the diaphragm 300 may include a diaphragm having a first surface and a second surface opposite each other, the first surface and / or the second surface being provided with a coating layer; wherein the coating layer includes at least one of boehmite, polymer, and gel electrolyte.

[0067] By applying a protective coating to the diaphragm, the coating effectively improves the diaphragm 300's resistance to needle puncture, tensile strength, high temperature resistance, and liquid absorption. In addition, the coating gives the diaphragm 300 higher conductivity and higher ion permeability.

[0068] The coating layer may consist only of boehmite, polymer, or gel electrolyte; alternatively, it may include any two of boehmite, polymer, and gel electrolyte, or all three. This embodiment of the invention does not limit the specific composition of the coating layer.

[0069] It should be noted that the coating layer can be provided only on the first surface of the diaphragm, or only on the second surface of the diaphragm, or both the first and second surfaces can be coated. This embodiment of the present invention does not limit the specific application of the coating layer.

[0070] In addition, in this embodiment of the invention, the negative electrode 500 can be made of either lithium metal or a lithium-copper composite. Specifically, for the lithium-copper composite, a layer of lithium metal can be formed on the surface of a copper foil by rolling or electroplating to create a lithium-copper composite sheet with a supporting structure. The copper foil may include microporous copper foil.

[0071] In addition, in this embodiment of the present invention, a separator 300 can be covered on the negative electrode sheet 500, and the negative electrode sheet 500 covered with the separator 300 can be made into one of the following shapes: strip, circle, quadrilateral, polygon, or irregular shape by slitting or die-cutting process.

[0072] In addition, this utility model embodiment also provides a method for processing a button cell battery, as detailed below:

[0073] Using medical-grade 316 stainless steel, and with a battery diameter of 9.3 mm and a total height of 6.0 mm, a shell 800 with a bottom-sealing groove 801, a plugging component 700 with explosion-proof scratches 701, and a cover assembly body 103 with a flared hole are prepared. The thickness of both the shell 800 and the plugging component 700 can be 0.2 mm. Then, the electrode post 101 and insulator 102 are inserted into the flared hole of the cover assembly body 103, and the cover assembly 100 is formed by high-temperature sintering. Next, 300-mesh manganese dioxide is selected as the active material, and a slurry is prepared by mixing the active material, conductive agent, and water-based binder at a mass ratio of 92:5:3. This slurry is then pressed onto the positive electrode current collector to form a positive electrode plate, which is dried and then slited into 4.0 mm wide strip-shaped positive electrode sheets 400. Li-1 lithium strip was then selected as the negative electrode material. The lithium foil and copper foil were kneaded together by rolling or electroplating, and then slid into 3.8mm wide strip-shaped negative electrode sheets 500. The prepared positive electrode sheet 400 was then inserted into the membrane tube of the separator 300 and loaded together with the prepared negative electrode sheet 500 into an automatic winding machine to form a cylindrical battery pack. The flared portion of the cover assembly 100 was inserted into the battery pack, and the exposed negative electrode tab 501 was welded to the terminal post 101. After the exposed positive electrode tab 401 of the battery pack was welded to the housing 800, the battery pack was pressed into the inner cavity of the housing 800, and the cover assembly body 103 was reliably connected to the housing 800 using a laser welding machine. Next, using a vacuum injection system, the fully sealed coin cell battery is injected for the first time through the injection hole 802 at the bottom of the casing 800. Then, the injection hole 802 is sealed with a silicone rubber pre-sealing plug, and the battery is transferred to an anhydrous and oxygen-free glove box for settling. After settling for 4 hours, the battery is removed, the silicone rubber pre-sealing plug is removed, and the battery is injected a second time through the injection hole 802 using the vacuum injection system. Then, the plugging component 700 is placed in the plugging groove 801 at the bottom of the casing 800, with the surface engraved with explosion-proof scratches 701 facing away from the bottom of the casing 800. The plugging component 700 is then reliably connected to the bottom of the casing 800 using laser welding to form a single unit, thus creating a fully sealed coin cell battery.

[0074] In addition, in this embodiment of the invention, the button cell can be left in its natural state for one day, and after leakage detection, it can be discharged using a battery testing system to obtain a discharge curve. Figure 5 As shown in the discharge curve, the curve is smooth, indicating that the button battery provided by this embodiment of the invention has good performance.

[0075] This utility model provides a medical device that includes a button battery as described in any of the above embodiments.

[0076] It should be noted that, in this embodiment of the utility model, the medical electrical equipment includes, but is not limited to, endoscopes.

[0077] In addition, in this embodiment of the present invention, for medical devices, according to the extreme envelope diameter tolerance of the button battery, the types of button batteries provided in this embodiment of the present invention can be divided into 93 series (9.3mm±0.5mm), 83 series (8.3mm±0.5mm), 73 series (7.3mm±0.5mm), 63 series (6.3mm±0.5mm), 53 series (5.3mm±0.5mm), and 43 series (4.3mm±0.5mm).

[0078] Although the present invention has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made therein without departing from the spirit and scope of the present invention. Accordingly, this specification and drawings are merely exemplary descriptions of the present invention as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include such modifications and modifications.

Claims

1. A fully sealed button battery, characterized in that, Includes cover assembly, housing, and plugging components; The housing has an open slotted cavity. The cover assembly includes a pole, an insulator, and a cover assembly body. At least a portion of the pole is located in the cavity. The cover assembly body has a flared hole. The pole passes through the flared hole. A portion of the pole is located outside the battery. The pole and the wall of the flared hole are insulated from each other by an insulator. The pole and the inner wall of the internal cavity of the battery are insulated from each other. The cover assembly fits onto the opening and is seamlessly welded to form the internal cavity of the battery. The battery internal cavity is equipped with, from top to bottom, an upper insulating sheet, a battery core pack, an electrode tab insulating tape, an electrolyte, and a lower insulating sheet. The battery cell pack includes a positive electrode, a separator, and a negative electrode. The positive electrode and the negative electrode wrap around each other or are stacked alternately, and a separator is provided between the positive electrode and the negative electrode. The positive electrode plate has at least one positive electrode tab, and the negative electrode plate has at least one negative electrode tab. The positive electrode tab is connected to the inner wall of the housing, and the negative electrode tab is connected to the lower end face of the electrode post. The electrode tab insulating tape is either polypropylene tape or polyimide tape, and is wrapped around the non-welded part of the positive electrode tab or the negative electrode tab to prevent the positive electrode or the negative electrode from conducting short circuit with the inner wall of the internal cavity of the battery. The plugging component is engraved with explosion-proof markings; The housing, the cover assembly body, and the plugging component are made of any one of stainless steel, aluminum alloy, titanium alloy, or coated metal that conform to the relevant standards for metal materials and products for food contact.

2. The fully sealed button battery according to claim 1, characterized in that, The shell, the plug, and the cover assembly are made of stainless steel, aluminum alloy, titanium alloy, or coated metal with a thickness of 0.05mm to 0.5mm, conforming to the standards for metal materials and products for food contact.

3. The fully sealed button battery according to claim 1, characterized in that, The diameter of the electrode post is 0.3mm to 4mm, and the material of the electrode post is any one of Kovar alloy, copper, aluminum alloy, and stainless steel.

4. A fully sealed button battery according to claim 1, characterized in that, The battery pack includes a positive electrode, a separator, and a negative electrode, and the battery pack is manufactured using either a winding or a stacking method.

5. A fully sealed button battery according to claim 1, characterized in that, The positive electrode sheet is prepared by mixing active material, conductive agent, and binder in a ratio of 85%–95%:4%–10%:1%–5%, and then coating or rolling it onto the positive electrode current collector. It is then slit or die-cut into one of the following shapes: strip, circle, quadrilateral, polygon, or irregular shape. The active material is at least one of manganese dioxide, carbon fluoride, silver vanadate, or metal oxide. The binder is at least one of sodium polyacrylate, sodium carboxymethyl cellulose, polytetrafluoroethylene emulsion, rubber emulsion, acrylic homopolymer, polyvinyl alcohol, acrylonitrile copolymer, or conductive polymer binder. The positive electrode current collector is one of aluminum foil, aluminum mesh, 304 stainless steel foil, 316 stainless steel foil, 304 stainless steel mesh, or 316 stainless steel mesh.

6. A fully sealed button battery according to claim 1, characterized in that, The separator is any one of a separator with a single-sided or double-sided coating layer or a PEP separator, and the positive electrode sheet and the negative electrode sheet are separated by one of the following methods: wrapping, tube insertion, or hot-pressing edge melting bag making; the coating layer includes at least one of boehmite, polymer, and gel electrolyte.

7. A fully sealed button battery according to claim 1, characterized in that, The negative electrode sheet is made of metallic lithium or is made into a lithium-copper composite sheet. After being coated with a release film, it is slit or die-cut into one of the following shapes: strip, circle, quadrilateral, polygon, or irregular shape.

8. A fully sealed button battery according to claim 1, characterized in that, The shell has a plugging groove, and the bottom of the shell has a liquid injection hole.

9. A fully sealed button battery according to claim 1, characterized in that, The battery has an extreme envelope diameter of 4mm to 9.8mm and a height of 4mm to 8.5mm, and the battery is a cylindrical, prismatic, or irregularly shaped metal casing battery.

10. A medical electrical device, characterized in that, The medical electrical device includes the fully sealed button battery as described in any one of claims 1 to 9.

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