Fully-sealed button cell and medical electric equipment

Abstract

The invention discloses a fully-sealed button cell and medical electric equipment. The fully-sealed button cell comprises a cell cover group, an upper insulating sheet, a positive pole piece, a diaphragm, a negative pole piece, an electrolyte, a lower insulating sheet, a shell and a hole plugging piece, the cover group comprises a cover group body, an insulator and a pole, the problems of sealing failure and liquid leakage of the battery caused by difficult sintering and connection failure of the ultrathin cover group body are solved by adopting the horn hole design, and the sealing performance, the safety, the reliability, the weather resistance and the storage period of the battery are improved by adopting glass sintering; meanwhile, the space proportion of the cover group in the inner cavity of the battery is further reduced, the capacity of the battery with the same volume is improved by more than 10%, the miniaturization of the battery is also facilitated, and a fully-sealed button battery with the envelope diameter of 4-9.8 mm and the height of more than or equal to 4 mm is manufactured; the positive pole piece is made of a water-soluble binder and does not generate volatile substances; the electrolyte contains the gas production inhibiting additive, so that the storage and use safety of the battery is more reliable; the hole blocking piece is engraved with an anti-explosion cutting line, so that the use safety is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and relates to the design and manufacture of batteries used in the fields of medical and health such as endoscopic capsules, human contact (implantable) medical devices or medical robots, as well as the use of batteries in related fields with high safety, extreme environments, harsh usage conditions, and long storage periods. Background Art

[0002] Miniaturization, high specific energy, high safety, and high reliability of batteries used in the fields of medical and health such as endoscopic capsules, human contact (implantable) medical devices or medical robots are one of the problems in the miniaturization and multi-function of medical and health devices.

[0003] For the traditional fully sealed endoscopic capsule battery, the reliability and effectiveness of insulator sintering are ensured by thickening the cover group body, which reduces the internal space of the battery. Moreover, the cover group body is provided with a liquid injection hole, which to a certain extent restricts the development of battery capacity increase and structural miniaturization; for the button battery, the insulator is made of plastic materials such as silicone, resin, or modified Teflon (PFA), etc., and there are safety risks such as electrolyte leakage, electrical performance degradation, and even failure during long-term storage for more than 5 years (including 5 years).

[0004] Focusing on the practical problems and development bottlenecks of endoscopic capsules, human contact (implantable) medical devices or medical robots, a fully sealed button battery is developed to meet the needs of button batteries in the fields of medical and health, big health, as well as related fields with high safety, extreme environments, harsh usage conditions, and long storage periods. Summary of the Invention

[0005] The purpose of the present invention is to develop a high-safety, high-specific energy, miniaturized fully sealed battery in series to meet the needs of batteries in the fields of medical and health, big health, as well as related fields with high safety, extreme environments, harsh usage conditions, and long storage periods, aiming at the development needs of miniaturization and multi-function of endoscopic capsules, human contact (implantable) medical devices or medical robots, etc.

[0006] The present invention also relates to the structural composition and use of the fully sealed battery, and the following technical solutions are adopted to achieve the purpose of the invention.

[0007] In the first aspect, the present invention provides a fully sealed button battery, which includes a cover group, a housing, and a hole plugging member. The three are mutually matched according to the designed processing tolerances and are welded and sealed to form an internal cavity of the battery. An upper insulating sheet, a battery core package, a tab insulating tape, an electrolyte, and a lower insulating sheet are sequentially installed in the internal cavity of the battery from top to bottom.

[0008] The cover group includes a terminal post, an insulator, and a cover group body, and is sintered into a circular, rectangular, square, polygonal or special-shaped combination; preferably, the extreme envelope diameter of the battery terminal is 4 mm to 9.8 mm.

[0009] In the center of the cover group body, a horn-shaped hole is formed by mechanical processing such as stretching and stamping. The horn-shaped hole is located in the housing, and the pole post passes through the horn-shaped hole. Part of the pole post is located outside the housing. The pole post is connected to the inner wall of the horn-shaped hole through the insulator, and the pole post is insulated from the cover group body and the inner wall of the housing. Preferably, the outer diameter of the horn-shaped hole is 0.7 mm to 4.5 mm.

[0010] The insulator is a vitreous body with weather resistance, resistance to hydrofluoric acid corrosion and electrochemical corrosion, insulation properties, and can balance the thermal stress and structural stress caused by different thermal expansion and contraction coefficients of the pole post, the insulator, and the cover group body. Further, for the cover group body and the pole post, the vitreous body is melted and injected into the fitting gap between the pole post and the horn-shaped hole of the cover group body, and then cooled and solidified to bond the pole post and the cover group body, so that the pole post is insulated from the hole wall of the horn-shaped hole and reliably connected, improving the battery sealing reliability, and further enhancing the battery's storage life, environmental adaptability, and use safety.

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

[0012] The housing is machined by mechanical processing such as stretching and stamping into a cylindrical, prismatic, or irregular-shaped groove-shaped accommodating cavity with an opening, having a diameter of 4 mm to 9.8 mm and a height of 4 mm to 8.5 mm, and the cover group covers the opening; a plug hole sink is made at the bottom of the housing and a liquid injection hole is opened. Preferably, the housing of the wound battery core package is cylindrical, and the housing of the disc battery core package is cylindrical, prismatic, or irregular-shaped; the size of the sink is determined according to the outer shape size of the plugging member.

[0013] The plugging member is machined by mechanical processing such as stamping and etching to scribe an explosion-proof scoring line on one of its planes. Preferably, the depth of the explosion-proof scoring line is 1 / 3 to 1 / 2 of the thickness of the plugging member.

[0014] Optionally, according to the use and related standards of a fully sealed button battery of the present invention, the materials of the cover group body, the housing, and the plugging member are selected from any one of stainless steel, aluminum alloy, titanium alloy, and coated metal that meet the relevant standards of food-contact metal materials and products. Preferably, it is any one of stainless steel and titanium alloy with a thickness of 0.05 mm to 0.5 mm.

[0015] The battery core package includes a positive electrode tab, a separator, a negative electrode tab, and an ear insulation tape. After being made in one of the forms of winding and stacking, the ear insulation tape is coated on the non-welded parts of the positive electrode ear and the negative electrode ear.

[0016] Further, the positive electrode plate is mixed in a ratio of active material: conductive agent: binder of 85.5% - 94.8%: 4% - 10%: 1.2% - 4.5%, and is coated or roll-pressed onto the positive current collector, and then cut into strips or die-cut into one of the shapes of strip, circle, quadrilateral, polygon, or special shape. Preferably, the active material is at least one of manganese dioxide, carbon fluoride, silver vanadate, and metal oxide.

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

[0018] The positive 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 cutting into strips or die-cutting is made into one of the shapes of strip, circle, quadrilateral, polygon, or special shape. Preferably, the positive electrode plate of the wound battery core package is in strip shape, and the positive electrode plate of the stacked battery core package is one of the shapes of circle, quadrilateral, polygon, or special shape.

[0020] The separator is any one of a separator with a single-sided or double-sided coating layer, a PEP separator, in the form of a strip wound into a roll or a tube wound into a roll, and separates the positive electrode plate or the negative electrode plate by one of the methods of wrapping, threading through a tube, and hot-pressing and fusing the edges to form a bag. Preferably, for the separator with a single-sided or double-sided coating layer, the coating layer includes at least one of boehmite, polymer, and gel electrolyte.

[0021] Further, for the wrapping, the strip-wound separator is placed between the positive electrode plate and the negative electrode plate by winding or pasting (Z-shaped); for the threading through a tube, the positive electrode plate or the negative electrode plate is inserted into the tubular separator and then made into a battery core package by either winding or stacking; for the hot-pressing and fusing the edges to form a bag, the strip separator is cut into the shape of the electrode plate, and the edges are hot-pressed and fused to cover the positive electrode plate or the negative electrode plate, and the hot-pressed and fused edges extend beyond the edge of the electrode plate by 0.5 mm - 3 mm.

[0022] The negative electrode plate is one of the forms of metallic lithium and lithium-copper composite, and after being coated with a release film, it is cut into strips or die-cut into one of the shapes of strip, circle, quadrilateral, polygon, or special shape. Preferably, the lithium-copper composite form is adopted, that is, a layer of metallic lithium is formed on the surface of the copper foil by rolling or electroplating to make a lithium-copper composite sheet with a support structure.

[0023] Further, the slitting or die-cutting is made into one of strip, circular, quadrilateral, polygonal, and irregular shapes. Preferably, the negative electrode tab of the wound battery core package is strip-shaped, and the negative electrode tab of the disc-shaped battery core package is one of circular, quadrilateral, polygonal, and irregular shapes, and is consistent with the shape of the positive electrode tab.

[0024] The tab insulating tape is any one of polypropylene tape and polyimide tape, and is coated on the non-welded part of the positive electrode tab or the negative electrode tab to prevent the positive electrode sheet or the negative electrode sheet from being electrically connected and short-circuited with the inner wall of the battery internal cavity. Preferably, the tab insulating tape is polypropylene tape.

[0025] The electrolyte contains additives that inhibit gas generation in the corresponding electrochemical system battery, and is filled with liquid by limit quantification. The amount of free electrolyte is 0-5% of the pore volume of the battery core package.

[0026] Further, the characteristic external shape structure of a fully sealed button battery of the present invention is: a cylindrical or prismatic metal shell battery with an extreme envelope diameter of 4 mm to 9.8 mm and a height of 4 mm to 8.5 mm. Preferably, in accordance with the principle of giving priority to the battery power capacity, after design, at the same height dimension, the extreme envelope diameter is 8.8 mm to 9.8 mm, and the preferred range of the pole diameter is 0.3 mm to 4 mm; the extreme envelope diameter is 7.8 mm to 8.8 mm, and the preferred range of the pole diameter is 0.3 mm to 3 mm; the extreme envelope diameter is 6.8 mm to 7.8 mm, and the preferred range of the pole diameter is 0.3 mm to 2 mm; the extreme envelope diameter is 5.8 mm to 6.8 mm, and the preferred range of the pole diameter is 0.3 mm to 1 mm; the extreme envelope diameter is 4.8 mm to 5.8 mm, and the preferred range of the pole diameter is 0.3 mm to 0.5 mm; the extreme envelope diameter is 4.0 mm to 4.8 mm, and the pole diameter is preferably less than 0.3 mm.

[0027] In a second aspect, the present invention provides a medical electrical device, and the medical electrical device includes the fully sealed battery according to any one of the first aspects above.

[0028] In the present invention, since the positive electrode plate and the negative electrode plate are wrapped around each other or alternately stacked, a separator is provided between the positive electrode plate and the negative electrode plate. Therefore, the separator can isolate the positive electrode plate from the negative electrode plate, preventing the positive electrode plate from conducting with the negative electrode plate and avoiding the occurrence of internal short circuit problems in the button cell. Since a sound hole is provided on the cover group body, the sound hole is located in the housing, and the terminal post passes through the sound hole, with a part of the terminal post located outside the housing. Therefore, the part of the terminal post located outside the housing can be connected to other components, enabling the electrical energy of the fully sealed battery to be transmitted to other components through the terminal post. Moreover, the insulator is made of glass body and sintered between the terminal post and the sound hole to achieve permanent and reliable sealing, that is, complete isolation between the inside and outside of the battery, avoiding the leakage of the electrolyte and preventing problems that affect the safety of the fully sealed battery. Since each positive electrode plate forms at least one positive electrode tab, and each negative electrode plate forms at least one negative electrode tab, the positive electrode tab is connected to the inner wall of the housing or the cover group body, and the negative electrode tab is connected to the terminal post. Therefore, the negative electrode plate is connected to the terminal post, the positive electrode plate is connected to the inner wall of the housing through the positive electrode tab, and the terminal post is insulated from the inner wall of the sound hole, and the terminal post is insulated from the housing, thus ensuring insulation between the positive electrode plate and the negative electrode plate, avoiding internal short circuit of the battery, improving the safety of the fully sealed battery, and enabling the fully sealed battery to normally transmit electrical energy through the terminal post.

[0029] In addition, the insulator is sintered between the terminal post and the sound hole; after the battery core is packaged into the housing, the positive electrode tab and the negative electrode tab are respectively welded to the inner wall of the housing and the lower end surface of the terminal post; after the cover group is closed on the opening of the housing, the cover group body is welded to the housing; after the battery is filled with electrolyte, the plugging member is inserted into the plugging sink and welded. Therefore, a fully sealed structure is formed, which can improve the storage life, environmental adaptability, reliability, and safety of the battery. Using materials that meet the relevant standards for food-contact metal materials and products can improve the safety and hygiene standards of battery use. That is, in the embodiments of the present invention, the fully sealed button cell can meet various requirements.

[0030] The cover group body adopts a sound hole structure, which can reduce the thickness of the cover group body, thereby increasing the internal space of the battery, increasing the discharge capacity of the battery with the same envelope diameter and height by more than 10%, and facilitating the miniaturization, serialization, and standardization of the primary battery models for endoscopic capsules, human contact (implantable) medical devices, or medical robots. According to the tolerance of the extreme envelope diameter of the battery, a fully sealed button cell is 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). Description of the Drawings

[0031] The accompanying drawings described herein are used to provide a further understanding of the present invention and form a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 It is a schematic diagram of the battery structure of the present invention.

[0033] Figure 2 It is a schematic diagram of the battery cover group structure of the present invention.

[0034] Figure 3 It is a schematic diagram of the battery housing structure of the present invention.

[0035] Figure 4 It is a schematic diagram of the battery hole plugging member of the present invention.

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

[0037] Reference numerals: 100 - cover group, 101 - pole post, 102 - insulator, 103 - cover group body, 200 - upper insulating sheet, 300 - separator, 400 - positive electrode plate, 401 - positive electrode tab, 500 - negative electrode plate, 501 - negative electrode tab, 600 - lower insulating sheet, 700 - hole plugging member, 701 - explosion-proof scratch, 800 - housing, 801 - hole plugging sink, 802 - liquid injection hole, 900 - tab insulating tape. Detailed Embodiments

[0038] In order to clearly describe the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and roles. For example, the first threshold and the second threshold are only used to distinguish different thresholds and do not limit their sequence. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and terms such as "first" and "second" do not necessarily limit being different.

[0039] It should be noted that in the present invention, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present invention should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0040] In the present invention, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, or B exists alone, where A and B may be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of a single item or multiple items. For example, at least one (item) of a, b, or c may represent: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b, and c, where a, b, and c may be single or multiple.

[0041] An embodiment of the present invention provides a fully sealed button cell, as Figures 1 to 4 shown. The fully sealed button cell includes: a cover group 100, a housing 800, a plurality of positive electrode plates 400, and a plurality of negative electrode plates 500.

[0042] The housing 800 has an open trough-shaped receiving cavity, and the cover group 100 covers the opening; a plurality of positive electrode plates 400 and a plurality of negative electrode plates 500 are both located in the receiving cavity, and the positive electrode plates 400 and the negative electrode plates 500 are wound around each other to form a cylindrical battery core package. A separator 300 is provided between the positive electrode plates 400 and the negative electrode plates 500 to isolate the positive electrode plates 400 and the negative electrode plates 500; the cover group 100 includes a pole column 101 and a cover group body 103. The cover group body 103 covers the opening of the housing 800, and at least part of the pole column 101 is located in the receiving cavity. A horn hole is provided on the cover group body 103, and the horn hole is located in the housing 800. The pole column 101 passes through the horn hole, and part of the pole column 101 is located outside the housing 800. The pole column 101 is connected to the inner wall of the horn hole through an insulator, and the pole column 101 is insulated from the inner wall of the housing 800; each positive electrode plate 400 is formed with at least one positive electrode tab 401, and each negative electrode plate 500 is formed with at least one negative electrode tab 501. The positive electrode tab 401 is connected to the inner wall of the housing 800 or the cover group body 103, and the negative electrode tab 501 is connected to the pole column 101.

[0043] In the embodiment of the present invention, since the positive electrode plate 400 and the negative electrode plate 500 are wound around each other, a separator 300 is disposed between the positive electrode plate 400 and the negative electrode plate 500. Therefore, the separator 300 can isolate the positive electrode plate 400 and the negative electrode plate 500, preventing the positive electrode plate 400 and the negative electrode plate 500 from being electrically connected and avoiding the occurrence of a problem of internal short circuit in the fully sealed button cell. Since a sound hole is provided on the cover group body 103, the sound hole is located in the housing 800, and the terminal post 101 passes through the sound hole, and a part of the terminal post 101 is located outside the housing 800. Therefore, the part of the terminal post 101 located outside the housing 800 can be connected to other components, enabling the electric energy of the button cell to be transmitted to other components through the terminal post 101. Moreover, the insulator 102 is made of glass body and sintered between the terminal post and the sound hole to achieve permanent and reliable sealing, that is, complete isolation between the inside and outside of the battery, avoiding the leakage of the electrolyte and preventing the occurrence of problems affecting the safety of the fully sealed battery. Since each positive electrode plate 400 is formed with at least one positive electrode tab 401, and each negative electrode plate 500 is formed with at least one negative electrode tab 501, the positive electrode tab 401 is electrically connected to the inner wall of the housing 800 or the cover group body 103, and the negative electrode tab 501 is electrically connected to the terminal post 101. Therefore, the negative electrode plate 500 is connected to the terminal post 101, the positive electrode plate 400 is connected to the inner wall of the housing 800 through the positive electrode tab 401, and the terminal post 101 is insulated from the inner wall of the sound hole of the cover group body 103, and the terminal post 101 is insulated from the inner wall of the housing 800, thereby ensuring insulation between the positive electrode plate 400 and the negative electrode plate 500, avoiding internal short circuit of the battery, improving the safety of the fully sealed battery, and enabling the fully sealed battery to normally transmit electric energy through the terminal post 101.

[0044] In addition, the insulator 102 is sintered between the terminal post and the sound hole; after the cylindrical battery core is packaged in the housing 800, the positive electrode tab 401 and the negative electrode tab 501 are respectively welded to the inner wall of the housing 800 and the lower end surface of the terminal post 101; after the cover group 100 is covered on the opening of the housing 800, the cover group body 103 is welded to the housing 800; after the battery is filled with electrolyte, the plugging member 700 is inserted into the plugging sink 801 and welded. Therefore, a fully sealed structure is formed, which can improve the storage life, environmental adaptability, reliability and safety of the battery. The material conforming to the relevant standards of food-contact metal materials and products is used to improve the safety and hygiene standards of battery use. That is, in the embodiment of the present invention, the fully sealed button cell can meet various requirements.

[0045] It should be noted that in the embodiments of the present invention, each positive electrode tab 400 can be connected to one positive electrode tab 401. Of course, each positive electrode tab 400 can also be connected to multiple positive electrode tabs 401. In this regard, the embodiments of the present invention do not make any limitations here. Of course, in the embodiments of the present invention, the positive electrode tab 400 itself can also be used as the positive electrode tab 401. In addition, each negative electrode tab 500 can be connected to one negative electrode tab 501. Of course, each negative electrode tab 500 can also be connected to multiple negative electrode tabs 501. In this regard, the embodiments of the present invention do not make any limitations here. Of course, in the embodiments of the present invention, the negative electrode tab 500 itself can also be used as the positive electrode tab 301. Among them, when each positive electrode tab 400 is connected to multiple positive electrode tabs 401 and each negative electrode tab 500 is connected to multiple negative electrode tabs 501, at this time, it is equivalent to setting in the form of multiple electrode tabs in the fully sealed button cell; when the positive electrode tab 400 itself is used as the positive electrode tab 401 and the negative electrode tab 500 itself is used as the positive electrode tab 301, at this time, it is equivalent to setting in the form of full electrode tabs in the fully sealed button cell.

[0046] In addition, in the embodiments of the present invention, the material of the housing 800 can be a metal material, that is, the housing 800 is formed by metal processing. Among them, the material of the housing 800 can include but is not limited to any one of stainless steel, aluminum alloy, titanium alloy, and plated metal that meet the relevant standards for food-contact metal materials and products. In addition, when the material of the housing 800 is stainless steel or titanium alloy, the thickness of the housing 800 can be any value between 0.05 mm and 0.3 mm. For example, the thickness of the housing 800 is 0.05 mm. For another example, the thickness of the housing 800 is 0.1 mm. For another example, the thickness of the housing 800 is 0.3 mm.

[0047] In addition, in the embodiments of the present invention, a horn hole is provided on the cover group body 103. Therefore, the pole column 101 can be passed through the horn hole on the cover group body 103, and the positive electrode tab 401 is electrically connected to the housing 800, or the positive electrode tab 401 is connected to the cover group body 103. The pole column 101 is connected to the inner wall of the horn hole of the cover group body 103 through the insulator 102, and the pole column 101 and the cover group body 103 are insulated from each other, so as to ensure that the positive electrode tab 400 and the negative electrode tab 500 are insulated from each other and avoid the problem of short circuit inside the button cell caused by the conduction between the positive electrode tab 400 and the negative electrode tab 500.

[0048] It should be noted that the positive electrode tab 401 can be connected to the housing 800 by welding to connect the positive electrode tab 401 to the housing 800; the positive electrode tab 401 can also be connected to the cover group body 103 by welding to connect the positive electrode tab 401 to the cover group body 103. In addition, the negative electrode tab 501 can be welded to the pole column 101 to connect the negative electrode tab 501 to the pole column 101.

[0049] In addition, in some embodiments, the fully sealed button cell further includes a hole plugging member 700. The bottom of the housing 800 opposite to the cover group body 103 has a hole plugging sink 801. A liquid injection hole 802 is provided in the hole plugging sink 801, and the liquid injection hole 802 penetrates through the bottom of the housing 800. The hole plugging member 700 is located in the hole plugging sink 801, and the hole plugging member 700 seals the liquid injection hole 802.

[0050] Since the bottom of the housing 800 has a hole plugging sink 801 and a liquid injection hole 802 is provided in the hole plugging sink 801, electrolyte can be injected into the accommodation cavity of the housing 800 through the liquid injection hole 802, so that an electrochemical reaction occurs among the positive electrode plate 400, the negative electrode plate 500, and the electrolyte in the accommodation cavity to form electric energy. Since the hole plugging member 700 is located in the hole plugging sink 801 and the hole plugging member 700 seals the liquid injection hole 802, after the electrolyte is injected, the liquid injection hole 802 can be plugged by the hole plugging member 700 to prevent the electrolyte from leaking from the liquid injection hole 802. In addition, since the hole plugging member 700 is located in the hole plugging sink 801, the hole plugging member 700 can be flush with the outer surface of the bottom of the housing 800, thus avoiding the problem that the hole plugging member 700 protrudes from the bottom of the housing 800, which is not conducive to the popularization and application of the button cell. That is, in the embodiments of the present invention, by providing the liquid injection hole 802 in the hole plugging sink 801 and the hole plugging member 700 being located in the hole plugging sink 801, it is convenient to inject electrolyte into the fully sealed button cell and the application range of the fully sealed button cell can be expanded.

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

[0052] In addition, in some embodiments, an explosion-proof scratch 701 is provided on the surface of the hole plugging member 700 facing away from the cover group body 103.

[0053] Since an explosion-proof scratch 701 is provided on the surface of the bottom of the housing 800 facing away from the cover group body 103, once the temperature or air pressure inside the housing 800 is too high, resulting in the possible explosion of the button cell, the hole plugging member 700 is first damaged at the explosion-proof groove, so that the air pressure inside the housing 800 is released, preventing the fully sealed button cell from exploding, and thus improving the safety performance of the fully sealed button cell.

[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 is a cross shape, or for another example, the shape of the explosion-proof scratch 701 is a circular shape. The specific shape of the explosion-proof scratch 701 is not limited in the embodiments of the present invention. In addition, the depth of the explosion-proof scratch 701 can be 1 / 3 to 1 / 2 of the thickness of the hole plugging member 700.

[0055] In addition, in the embodiments of the present invention, the liquid injection hole 802 may be located in the middle of the bottom of the housing 800. Thus, when injecting electrolyte through the liquid injection hole 802, the electrolyte can be more evenly distributed in the housing 800. In addition, the plugging member 700 may also be located in the middle of the bottom of the housing 800. Thus, when the air pressure inside the fully sealed button cell is too high, the plugging member 700 is subjected to a greater force, and the explosion-proof scratch 701 is located on the plugging member 700, which can facilitate the damage of the plugging member 700 at the explosion-proof scratch 701, thereby relieving pressure.

[0056] In addition, in some embodiments, the button cell may further 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 accommodation cavity, and the upper insulating sheet 200 is disposed on the cover group body 103, and a part of the upper insulating sheet 200 is located between the pole post 101 and the cover group body 103, and the lower insulating sheet 600 is disposed on the bottom of the housing 800; the positive electrode plate 400, the negative electrode plate 500 and the separator 300 are located between the upper insulating sheet 200 and the lower insulating sheet 600.

[0057] Since the upper insulating sheet 200 is disposed on the cover group body 103, and a part of the upper insulating sheet 200 is located between the pole post 101 and the cover group body 103. Therefore, the presence of the upper insulating sheet 200 can effectively ensure that when the positive electrode plate 400 and / or the negative electrode plate 500 shake inside the housing 800, the positive electrode plate 400 and / or the negative electrode plate 500 directly contact the cover group body 103, resulting in the conduction between the positive electrode plate 400 and the negative electrode plate 500, and further resulting in the problem of internal short circuit of the fully sealed button cell. In addition, the lower insulating sheet 600 is disposed on the bottom of the housing 800. Therefore, the presence of the lower insulating sheet 600 can effectively ensure that when the positive electrode plate 400 and / or the negative electrode plate 500 shake inside the housing 800, the positive electrode plate 400 and / or the negative electrode plate 500 directly contact the bottom of the housing 800, resulting in the conduction between the positive electrode plate 400 and the negative electrode plate 500, and further resulting in the problem of internal short circuit of the fully sealed button cell. That is, by providing the upper insulating sheet 200 and the lower insulating sheet 600, the safety of the fully sealed button cell can be effectively improved.

[0058] In addition, in some embodiments, the negative electrode tab 501 is surrounded by the tab insulating tape 900. With this arrangement, the tab insulating tape 900 can play a role of covering and insulating the negative electrode tab 501, avoiding the problem of short circuit that may occur when the negative electrode tab 501 shakes and contacts the positive electrode plate 400 and / or the housing 800, and improving the safety of the button cell.

[0059] In addition, in some embodiments, the cover assembly 100 may further include an insulator 102; the insulator 102 is a vitreous body, sintered and solidified between the inner wall of the horn hole of the cover assembly body 103 and the terminal post 101 to insulatively and sealingly connect the terminal post 101 and the cover assembly body 103; 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 vitreous body with weather resistance, hydrofluoric acid corrosion resistance, and electrochemical corrosion resistance. Therefore, the terminal post 101 is insulated from the cover assembly body 103 and the housing 800, and the insulator 102 has a long service life, good weather resistance, hydrofluoric acid corrosion resistance, and electrochemical corrosion resistance, which extends the service life of the button cell and improves the sealing reliability of the button cell, thereby enhancing the storage life, environmental adaptability, and use reliability of the button cell. That is to say, by providing the insulator 102, it can effectively ensure the insulation between the terminal post 101, the housing 800, and the cover assembly body 103, and the presence of the insulator 102 extends the life of the button cell.

[0060] It should be noted that in the embodiments of the present invention, the terminal post 101 may be formed of a metal material, and the metal material forming the terminal post 101 includes, but is not limited to, kovar alloy, red copper, silver alloy, etc. In addition, the diameter of the terminal post 101 ranges from 0.3 mm to 4 mm, and the diameter of the terminal post 101 may be any value within the range of 0.3 mm to 4 mm. For example, the diameter of the terminal post 101 may be 0.3 mm, and for another example, the diameter of the terminal post 101 may be 1 mm, and for another example, the diameter of the terminal post 101 may be 2 mm, and for another example, the diameter of the terminal post 101 may be 4 mm.

[0061] In addition, in the embodiments of the present invention, the extreme envelope diameter of the fully sealed button cell may range from 8.8 mm to 9.8 mm. At this time, the diameter of the terminal post 101 ranges from 0.3 mm to 4 mm; when the extreme envelope diameter ranges from 7.8 mm to 8.8 mm, the diameter of the terminal post 101 ranges from 0.3 mm to 3 mm; when the extreme envelope diameter ranges from 6.8 mm to 7.8 mm, the diameter of the terminal post 101 ranges from 0.3 mm to 2 mm; when the extreme envelope diameter ranges from 5.8 mm to 6.8 mm, the diameter of the terminal post 101 ranges from 0.3 mm to 1 mm; when the extreme envelope diameter ranges from 4.8 mm to 5.8 mm, the diameter of the terminal post 101 ranges from 0.3 mm to 0.5 mm; when the extreme envelope diameter ranges from 4.0 mm to 4.8 mm, the diameter of the terminal post 101 may be 0.3 mm.

[0062] In addition, in some embodiments, the fully sealed button cell may further include an electrolyte located in the accommodating cavity. The electrolyte contains additives for inhibiting gas generation, which are used to inhibit the generation of hydrogen and / or hydrogen fluoride in the electrolyte. Through such an arrangement, it is possible to effectively avoid the easy generation of gas inside the button cell, thereby avoiding the problem of easy bulging of the button cell, and further improving the safety of the button cell.

[0063] In addition, in some embodiments, the positive electrode tab 400 may include a positive electrode current collector, on which a tab layer is provided. The tab layer includes: active material, conductive agent, and aqueous binder. The mass ratio of the active material, conductive agent, and aqueous binder is: 85wt% - 94.8wt%: 4wt% - 10wt%: 1.2wt% - 5wt%; wherein, the active material includes at least one of manganese dioxide, carbon fluoride, carbon fluoride modified material, and metal oxide, and the aqueous binder includes at least one of sodium polyacrylate, sodium carboxymethylcellulose, rubber emulsion, acrylic homopolymer, polyvinyl alcohol, acrylonitrile copolymer, and conductive polymer binder. Through such an arrangement, the positive electrode tab 400 can work effectively and stably, and the storage life of the positive electrode tab 400 is relatively long.

[0064] It should be noted that in the embodiments of the present 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. Among them, when the active material includes manganese dioxide, when using the coating method, the positive electrode current collector can be one of 304 / 316 stainless steel foil and 304 / 316 stainless steel mesh.

[0065] In addition, in the embodiments of the present invention, the positive electrode tab 400 can be made by die-cutting process or slitting process. Thus, the shape of the positive electrode tab 400 includes, but is not limited to, strip, circular, quadrilateral, polygonal, special-shaped, etc. In addition, for the wound battery core package, the shape of the positive electrode tab 400 of this kind of battery core package can be strip-shaped, and for the stacked battery core package, the shape of the positive electrode tab 400 of this kind of battery core package can be one of circular, quadrilateral, polygonal, and special-shaped.

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

[0067] By providing a coating protection layer on the separator, the coating layer effectively improves the separator 300 to have better puncture resistance, tensile resistance, high temperature resistance, and liquid absorption performance. In addition, the coating layer enables the separator 300 to have a higher conductivity and a higher ion passing rate.

[0068] Among them, the coating layer may only include boehmite, may only include a polymer, or may only include a gel electrolyte. Of course, the coating layer may also include any two of boehmite, polymer, and gel electrolyte, or may include all three of boehmite, polymer, and gel electrolyte. In this regard, the embodiments of the present invention do not make any limitations here.

[0069] It should be noted that the coating layer may be provided only on the first surface of the separator, may be provided only on the second surface of the separator, or of course, may be provided on both the first surface and the second surface. In this regard, the embodiments of the present invention do not make any limitations here.

[0070] In addition, in the embodiments of the present invention, the negative electrode sheet 500 may adopt one of the forms of metallic lithium and lithium-copper composite. Among them, for the lithium-copper composite, a layer of metallic lithium can be formed on the surface of the copper foil by rolling or electroplating to make a lithium-copper composite sheet with a support structure. The copper foil may include a microporous copper foil.

[0071] In addition, in the embodiments of the present invention, the separator 300 may be coated on the negative electrode sheet 500, and the negative electrode sheet 500 after coating the separator 300 may be made into one of the shapes of strip, circle, quadrilateral, polygon, and special shape by a slitting process or a die-cutting process.

[0072] In addition, the embodiments of the present invention also provide a processing method for a button cell, which is specifically as follows:

[0073] Select medical-grade 316 stainless steel, and prepare a housing 800 with a plugged hole sink 801 at the bottom, a plugging member 700 with explosion-proof scratches 701, and a cover group body 103 with a horn hole according to the battery diameter of 9.3 mm and the total height of 6.0 mm. Among them, the thickness of the housing 800 and the thickness of the plugging member 700 can both be 0.2 mm. Then, the pole 101 and the insulator 102 are inserted into the horn hole of the cover group body 103, and the cover group 100 is formed by high-temperature sintering. Then, 300-mesh manganese dioxide is selected as the active material, and a slurry is prepared by mixing the active material: conductive agent: water-based binder in a mass ratio of 92:5:3, and is roll-pressed and laminated onto the positive current collector to form a positive electrode plate. After drying, it is made into a strip-shaped positive electrode plate 400 with a width of 4.0 mm through a slitting process. Then, Li-1 lithium tape is selected as the negative electrode material. After the metallic lithium foil and the copper foil are kneaded by rolling or electroplating, it is slit into a strip-shaped negative electrode plate 500 with a width of 3.8 mm. Then, the prepared positive electrode plate 400 is inserted into the membrane tube of the separator 300, and together with the prepared negative electrode plate 500, they are loaded into an automatic winding machine to wind and form a cylindrical battery core package. The horn hole part of the cover group 100 is inserted into the battery core package, and the exposed negative electrode tab 501 is welded to the pole 101 to form an integral body. After the exposed positive electrode tab 401 of the battery core package is welded to the housing 800 to form an integral body, the battery core package is pressed into the inner cavity of the housing 800, and the cover group body 103 and the housing 800 are reliably connected into an integral body by a laser welder. Then, a vacuum liquid injection system is applied, and the fully sealed button battery is injected with liquid for the first time through the liquid injection hole 802 at the bottom of the housing 800. Then, the liquid injection hole 802 is pre-blocked with a silicone rubber plug, and it is transferred to an anhydrous and anaerobic glove box for static placement. After standing for 4 h, it is taken out, the silicone rubber pre-blocking plug is removed, and the vacuum liquid injection system is applied to inject the battery with liquid for the second time through the liquid injection hole 802. Then, the plugging member 700 is placed in the plugged hole sink 801 at the bottom of the housing 800, and the surface with the explosion-proof scratches 701 faces away from the bottom of the housing 800, and the plugging member 700 is reliably connected to the bottom of the housing 800 by a laser weld to form a fully sealed button battery.

[0074] In addition, in the embodiment of the present invention, the button battery can also be left in a natural state for 1 day. After leakage detection, a battery test system is used for discharging to obtain a discharge curve. As Figure 5 shown, it can be seen from the discharge curve that the curve is smooth, so the button battery provided by the embodiment of the present invention has good performance.

[0075] The embodiment of the present invention provides a medical device, and the medical device includes the button battery in any one of the above embodiments.

[0076] It should be noted that, in the embodiment of the present invention, medical electrical devices include, but are not limited to, endoscopes, etc.

[0077] In addition, in the embodiments 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 the embodiments of the present invention can be divided into the 93 series (9.3 mm ± 0.5 mm), 83 series (8.3 mm ± 0.5 mm), 73 series (7.3 mm ± 0.5 mm), 63 series (6.3 mm ± 0.5 mm), 53 series (5.3 mm ± 0.5 mm), and 43 series (4.3 mm ± 0.5 mm).

[0078] Although the present invention has been described in connection with specific features and their embodiments, it is obvious that various modifications and combinations can be made without departing from the spirit and scope of the present invention. Accordingly, this specification and the drawings are merely exemplary illustrations 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. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A fully sealed button battery, characterized in that: It includes a cover assembly, a shell and a hole plugging member; The shell has an open slot-shaped accommodating cavity, the cover assembly includes a pole, an insulator and a cover assembly body, at least part of the pole is located in the accommodating cavity, a horn hole is provided on the cover assembly body, the pole is passed through the horn hole, part of the pole assembly is located outside the battery, the pole is insulated and connected to the hole wall of the horn hole by an insulator, and the pole is insulated from the inner wall of the battery cavity; The cover assembly covers the opening and is seamlessly welded to form an internal cavity of the battery; The upper insulating sheet, the battery core pack, the tab insulating tape, the electrolyte and the lower insulating sheet are sequentially installed in the inner cavity of the battery from top to bottom; The battery core pack comprises a positive electrode sheet, a separator and a negative electrode sheet, wherein the positive electrode sheet and the negative electrode sheet are mutually wrapped or alternately stacked, and a separator is arranged between the positive electrode sheet and the negative electrode sheet; The positive electrode sheet is provided with at least one positive electrode tab, and the negative electrode sheet is provided with at least one negative electrode tab, the positive electrode tab is connected to the inner wall of the shell, and the negative electrode tab is connected to the lower end surface of the pole; The tab insulation tape is any one of a polypropylene tape and a polyimide tape, and is coated on the non-welding portion of the positive tab or the negative tab to prevent the positive tab or the negative tab from being short-circuited with the inner wall of the battery cavity; The hole blocking member is engraved with explosion-proof scoring lines; The shell, the cover assembly body and the hole plugging member are any one of stainless steel, aluminum alloy, titanium alloy and plated metal that meet the standards for metal materials and products for food contact.

2. A fully sealed button cell according to claim 1, characterized in that: The shell, the hole plugging member and the cover assembly body are any one of stainless steel, aluminum alloy, titanium alloy and plated metal with a thickness of 0.05 mm to 0.5 mm and conforming to the standards for metal materials and products for food contact.

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

4. A fully sealed button cell according to claim 1, characterized in that: The battery core pack comprises a positive electrode sheet, a separator and a negative electrode sheet, and the battery core pack is made in one of the forms of winding and lamination.

5. A fully sealed button cell according to claim 1, characterized in that: The positive electrode sheet is mixed according to the ratio of active material: conductive agent: binder of 85% to 95%: 4% to 10%: 1% to 5%, and is pressed on the positive electrode collector by coating or rolling, and is made into one of strips, circles, quadrilaterals, polygons, and special shapes by striping or die-cutting; the active material is at least one of manganese dioxide, carbon fluoride, silver vanadate, and metal oxide; the binder is at least one of sodium polyacrylate, sodium carboxymethyl cellulose, polytetrafluoroethylene emulsion, rubber emulsion, acrylic acid homopolymer, polyvinyl alcohol, acrylonitrile multi-copolymer, and conductive polymer binder; the positive electrode 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.

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

7. A fully sealed button cell according to claim 1, characterized in that: The negative electrode plate is made of metallic lithium or a lithium-copper composite plate, and after being coated with a release film, is stripped or die-cut into a strip, a circle, a quadrilateral, a polygon, or an irregular shape.

8. A fully sealed button cell according to claim 1, characterized in that: The shell is provided with a hole blocking sink, and the bottom of the shell is provided with a liquid injection hole.

9. A fully sealed button cell according to claim 1, characterized in that: The extreme envelope diameter of the battery is 4mm to 9.8mm and the height is 4mm to 8.5mm. The battery is a cylindrical, prismatic or irregular metal shell battery.

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

Images