CN214227016U - Button cell shell and button cell - Google Patents

Abstract

The utility model discloses a button cell shell, which comprises an anode metal end cover and a cathode metal end cover, wherein the anode metal end cover comprises a first bottom cover and a first enclosure wall arranged on one side of the first bottom cover in a surrounding manner, and the cathode metal end cover comprises a second bottom cover and a second enclosure wall arranged on one side of the second bottom cover in a surrounding manner; the positive pole metal end cover and the negative pole metal end cover are arranged oppositely, so that the end part of the first enclosure wall and the end part of the second enclosure wall are arranged oppositely and at intervals, a first insulation external member is arranged on the first enclosure wall, a second insulation external member is arranged on the second enclosure wall, the first insulation external member and the second insulation external member are connected at the joint surface to form an insulation shell of an integrated structure, and the integrated structure of the insulation shell, the positive pole metal end cover and the negative pole metal end cover form an accommodating cavity for accommodating an electric core. The utility model discloses a button cell shell simple structure, easy realization. The insulating shell improves the energy density of the button cell, ensures the good insulativity of the button cell shell and improves the processing reliability.

Description

Button cell shell and button cell

Technical Field

The utility model belongs to the technical field of the battery, a button cell shell and button cell are related to.

Background

With the rapid development of electronic technology and information industry, a large number of portable power sources are required in people's production and life. As an electrochemical energy storage system, a lithium ion battery has outstanding advantages and becomes an important technology indispensable for new energy development and utilization, and a rechargeable lithium ion battery is widely researched and applied due to its characteristics of high energy density, long cycle life and environmental friendliness.

Button cells disclosed in the prior art are basically comprised of an upper and a lower steel casing sleeve, with a layer of insulating rubber sandwiched between them, which are clamped to form a seal. The CN210744008U discloses a button cell, which includes a casing, a cover plate, a positive electrode assembly, a negative electrode assembly, and a diaphragm, wherein the cover plate is covered on the casing, a sealing ring is disposed between the cover plate and the casing, and one end of the sealing ring near the bottom of the casing extends toward the bottom; the positive electrode assembly, the diaphragm and the negative electrode assembly are stacked in the shell, the positive electrode assembly is attached to the bottom of the shell, and the negative electrode assembly is attached to the cover plate; the positive pole subassembly includes positive polar ring and positive plate, positive polar ring cover is located the week portion of positive plate, positive polar ring keeps away from set up on one side of positive plate and is fixed with the clamp plate, the clamp plate is located the sealing ring with between the bottom, just the clamp plate is close to one side of sealing ring with the sealing ring butt. Also, for example, CN110752401A discloses a button cell, which comprises a conductive shell, an insulating gasket, a winding core and electrolyte, wherein the conductive shell is divided into an upper shell and a lower shell, and a sealing ring is arranged between the upper shell and the lower shell; all be provided with insulating gasket between roll up core and epitheca, the inferior valve, roll up the core and include positive plate, diaphragm and negative pole piece, the diaphragm sets up between positive plate and negative pole piece, insulating gasket overlaps on the diaphragm, and the anodal utmost point ear of positive plate or the negative pole utmost point ear of negative pole piece stretch out from insulating gasket's space, realize the contact with inferior valve or epitheca respectively and be connected. However, the external case of the button cell is made of metal, which has the disadvantages of heavy weight, high processing cost, relatively low specific energy, etc., and the metal case may also expand and explode due to the failure of the external protection plate, improper overcharge or overdischarge, high temperature environment, and internal short circuit, etc., thereby raising the safety concern. And moreover, an insulating layer is required to be added for connection between the upper steel shell sleeve and the lower steel shell sleeve, and the damage of the insulating layer in the packaging process easily causes the short circuit of the button cell and even the failure.

Therefore, how to reduce the weight, reduce the cost and improve the safety in use is the subject to be solved by the related manufacturers.

SUMMERY OF THE UTILITY MODEL

To the deficiency of the prior art, an object of the utility model is to provide a button cell shell and button cell. Will the utility model discloses a button cell shell is used for button cell preparation, demonstrates high energy density, the high rate advantage of discharging, can realize high-efficient mechanized manufacturing moreover.

In order to achieve the purpose, the utility model adopts the following technical proposal:

in a first aspect, the present invention provides a button cell housing, an anode metal end cap and a cathode metal end cap, wherein the anode metal end cap includes a first bottom cap and a first enclosure wall surrounding one side of the first bottom cap, and the cathode metal end cap includes a second bottom cap and a second enclosure wall surrounding one side of the second bottom cap;

the positive pole metal end cover and the negative pole metal end cover set up relatively that the tip that makes first leg and the tip of second leg are relative and the interval sets up, be provided with first insulation external member on the first leg, be provided with the insulating external member of second on the second leg, the insulating casing of formation body structure is connected at the looks junction to first insulation external member and the insulating external member of second, insulating casing forms the holding chamber with positive pole metal end cover and negative pole metal end cover for hold electric core.

The utility model discloses in, "the tip of first leg and the tip of second leg are relative and the interval sets up" and indicate: the end of the first surrounding wall and the end of the second surrounding wall are oppositely arranged, and a space is arranged between the end of the first surrounding wall and the end of the second surrounding wall without direct contact.

The utility model discloses an among the button cell shell, anodal metal end cover is used for linking to each other with the positive pole of electric core, and negative pole metal end cover is used for linking to each other with the negative pole of electric core. The utility model discloses a button cell shell simple structure, easy realization. The insulating shell improves the energy density of the button cell (such as a lithium ion button cell), ensures good insulativity of the button cell shell and improves the processing reliability.

As the utility model discloses button cell shell's preferred technical scheme, first insulating external member sets up first leg is inboard, the outside and end surface, the insulating external member of second sets up second leg is inboard, the outside and end surface.

The first surrounding wall comprises a first annular wall and a second annular wall which are coaxial and connected in sequence in the direction far away from the first bottom cover, and the diameter of the second annular wall is larger than that of the first annular wall.

The part of the first insulating sleeve arranged on the inner side of the first surrounding wall is abutted against the connecting surface of the first annular wall and the second annular wall, and the part of the first insulating sleeve arranged on the outer side of the first surrounding wall is abutted against the outer side of the first annular wall.

The second surrounding wall comprises a third coaxial annular wall and a fourth coaxial annular wall which are sequentially connected in the direction away from the second bottom cover, and the diameter of the fourth annular wall is larger than that of the third annular wall.

The part of the second insulating sleeve arranged on the inner side of the second surrounding wall is abutted against the connecting surface of the third annular wall and the second annular wall, and the part of the second insulating sleeve arranged on the outer side of the second surrounding wall is abutted against the outer side of the third annular wall.

Preferably, the thickness of the part of the first insulating sleeve arranged at the inner side and the outer side of the first surrounding wall is 0.1-5 mm, such as 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.6mm, 0.8mm, 1mm, 1.5mm, 1.7mm, 2mm, 2.5mm, 3mm, 3.2mm, 3.5mm, 4mm or 5mm, and preferably 0.2-0.8 mm;

the thicknesses of the parts, arranged on the inner side and the outer side of the second surrounding wall, of the second insulating sleeve are 0.1-5 mm independently, such as 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.6mm, 0.8mm, 1mm, 1.5mm, 1.7mm, 2mm, 2.5mm, 3mm, 3.2mm, 3.5mm, 4mm or 5mm, and the like, and the preferable thickness is 0.2-0.8 mm;

the height of the first annular wall is m, the m is 0.3-3 mm, such as 0.3mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.7mm, 2mm, 2.5mm or 3mm, and the like, and preferably 0.7-1.5 mm;

the height of the third annular wall is n, and n is 0.3-3 mm, such as 0.3mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.7mm, 2mm, 2.5mm or 3mm, and the like, and is preferably 0.7-1.5 mm;

the thickness of first leg and second leg is independently 0.1 ~ 0.3 mm.

Preferably, the connection surface of the first annular wall and the second annular wall is parallel to the first bottom cover, and the part of the first insulating sleeve arranged inside the first peripheral wall is consistent with the inner diameter ring surface of the first annular wall;

the connecting surface of the third annular wall and the fourth annular wall is parallel to the second bottom cover, and the part of the second insulating sleeve arranged on the inner side of the second surrounding wall is consistent with the inner diameter ring surface of the third annular wall;

preferably, the first insulating sleeve is formed on the first surrounding wall in an injection molding mode and used for wrapping the first surrounding wall;

the second insulation sleeve is formed on the second surrounding wall in an injection molding mode and used for wrapping the second surrounding wall.

Preferably, the connection is selected from at least one of a hot melt connection, ultrasonic welding, soldering, bonding.

The present invention is not limited to the specific manner of welding, and may include at least one of laser welding, ultrasonic welding, induction welding, and vibration welding, for example.

The present invention is not limited to the specific bonding manner, and for example, the bonding may be performed by glue.

Preferably, the abutting surfaces of the first insulating sleeve and the second insulating sleeve are mutually matched inclined surfaces.

Preferably, the material of the positive electrode metal end cap and the negative electrode metal end cap includes, but is not limited to, at least one of aluminum, iron and stainless steel.

The utility model discloses in, the material of anodal metal end cover and negative pole metal end cover can be the same, also can be different.

Preferably, the material of the first insulating sleeve and the second insulating sleeve independently comprises at least one of polymer materials, preferably but not limited to at least one of Polyethylene (PE), polypropylene (PP), polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene copolymer, polyoxymethylene, polycarbonate, polymethyl methacrylate and styrene-propylene copolymer, and more preferably at least one of polypropylene and polyethylene. The high polymer material can be naturally softened at a certain temperature (for example, PP and/or PE plastics are naturally softened at about 150 ℃), so that the upper and lower shell structures of the button cell shell are expanded and separated, the safety is kept by slow air leakage, and the safety of the cell is improved.

The first insulating sleeve and the second insulating sleeve are made of materials with different colors so as to distinguish the positive side from the negative side.

In a second aspect, the present invention provides a button cell, which comprises a first aspect, a button cell housing and an electric core located inside a holding cavity of the button cell housing.

The utility model discloses do not limit to button cell's concrete kind, for example can be lithium ion button cell. The lithium ion button cell can be a liquid button cell, a semi-solid button cell or an all-solid button cell.

The utility model discloses do not limit to button cell's shape, can be the cylinder, the cylinder can be in at least one kind in cylinder, regular polygon cylinder or the cylinder of irregular cross-section.

The utility model discloses not limiting button cell's footpath height ratio, technical personnel in the field can adjust according to actual need, can be greater than 1, equal to 1 or be less than 1.

The utility model does not limit the concrete types of the electric core in the button cell, for example, the electric core can be a winding type electric core, a stacking type electric core, and an electric core manufactured by other processes;

for the winding type battery cell, the axial direction of the battery cell is vertical to the first bottom cover and the second bottom cover;

for the stacked battery cell, the stacking surface of the battery cell is parallel to the first bottom cover and the second bottom cover.

The utility model discloses do not do the injeciton to the concrete structure and the constitution of electric core, for example, electric core includes positive pole, negative pole and barrier film, the barrier film is located between positive pole and the negative pole.

The utility model discloses it is right the kind of anodal active material in the positive pole does not do the restriction, including but not limited to at least one in lithium cobaltate, lithium manganate, lithium iron phosphate, lithium manganese phosphate, nickel cobalt manganese and the nickel cobalt aluminium ternary material.

The structure of the positive electrode active material of the present invention is not limited, and may be, for example, a metal oxide of a layered structure, a spinel structure, or an olivine structure system.

Preferably, the negative active material in the negative electrode includes, but is not limited to, at least one of lithium titanate, titanium dioxide, natural graphite, artificial graphite, carbon fiber, soft carbon, hard carbon, mesocarbon microbeads, elemental silicon, silicon oxy-compound, and silicon-carbon composite.

Preferably, the isolation diaphragm includes, but is not limited to, at least one of polypropylene, polyethylene, and alumina-plated ceramic isolation diaphragm.

Preferably, the accommodating cavity further contains electrolyte.

The utility model also provides a preparation method of foretell button cell, the method includes following step: and oppositely arranging the positive electrode metal end cover with the first insulation external member and the negative electrode metal end cover with the second insulation external member, respectively sleeving the positive electrode metal end cover and the negative electrode metal end cover on the outer side of the battery core, and connecting the connection surfaces of the first insulation external member and the second insulation external member to combine the positive electrode metal end cover and the negative electrode metal end cover to obtain the button cell.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model provides a button cell shell and button cell with insulating casing, through the setting of this insulating casing, can reduce whole weight and cost, and through the thickness that changes this insulation and/or change the hookup location relation of insulating casing and anodal metal end cover and negative pole metal end cover, can increase the size of this accommodation space, and then promote volume energy density, prolong button cell's continuation of the journey power.

2. The utility model discloses creatively provide a button cell shell with metal end cover (also be anodal metal end cover and negative pole metal end cover) and insulating casing, guaranteed button cell good terminal surface conductivity, machinery and thermal stability, synthesized the security that has improved lithium ion button cell.

3. The utility model provides a lithium ion button cell has that the structure is controllable, the design is simple, advantage with low costs, and casing subassembly quantity is reduced by 3 of prior art to 2, only seals through modes such as welding or hot melt and can obtain button cell shell, and the production degree of difficulty lowers, and the required machining precision of casing reduces, and the processing reliability improves, and the symmetry of product is better, the utility model discloses a button cell shell realizes commercialization easily.

Drawings

Fig. 1 is a front sectional view of a button cell according to a first embodiment;

fig. 2 is a top view of a button cell of the first embodiment;

fig. 3 is a front view of the button cell battery according to the first embodiment;

FIG. 4 is an elevational cross-sectional view of a positive metal end cap with a first insulating sleeve according to a first embodiment;

fig. 5 is an elevational cross-sectional view of a negative metal end cap with a second insulating sleeve according to the first embodiment;

the structure comprises a positive electrode metal end cover 1, a positive electrode metal end cover 11, a first bottom cover 12, a first surrounding wall 121, a first annular wall 122, a second annular wall 2, a negative electrode metal end cover 21, a second bottom cover 22, a second surrounding wall 221, a third annular wall 222, a fourth annular wall 3, a first insulation external member 4, a second insulation external member 5, an insulation shell 6 and a containing cavity 7.

Detailed Description

It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "side," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered as limiting the present invention.

It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly, and may for example be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The present invention will be described in detail with reference to examples. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the scope of the present invention. The specific process parameters and the like of the following examples are also only one example of suitable ranges, and a person skilled in the art can select the process parameters and the like within the suitable ranges through the description of the invention, and the specific selection of the following examples is not limited.

In one embodiment, the present invention provides a button cell battery case (see fig. 1 for front sectional view), which comprises a positive metal end cap 1 and a negative metal end cap 2, wherein the positive metal end cap 1 comprises a first bottom cap 11 and a first surrounding wall 12 enclosed on one side of the first bottom cap 11, and the negative metal end cap 2 comprises a second bottom cap 21 and a second surrounding wall 22 enclosed on one side of the second bottom cap 21; the positive electrode metal end cover 1 and the negative electrode metal end cover 2 are oppositely arranged to enable the end portion of the first casing wall 12 and the end portion of the second casing wall 22 to be oppositely arranged and spaced, the first casing wall 12 is provided with a first insulation sleeve 3, the second casing wall 22 is provided with a second insulation sleeve 4, the first insulation sleeve 3 and the second insulation sleeve 4 are connected at the joint face to form an insulation shell 5 of an integrated structure, and the insulation shell 5, the positive electrode metal end cover 4 and the negative electrode metal end cover 2 form an accommodating cavity 6 for accommodating an electric core.

The first surrounding wall 12 comprises a first annular wall 121 and a second annular wall 122 which are coaxial and connected in sequence along the direction away from the first bottom cover 11, and the diameter of the second annular wall 122 is larger than that of the first annular wall 121;

the second surrounding wall 22 comprises a third coaxial annular wall 221 and a fourth annular wall 222 which are connected in sequence along the direction away from the second bottom cover 21, and the diameter of the fourth annular wall 222 is larger than that of the third annular wall 221;

the first insulating kit 3 is arranged inside, outside and at the end surface of the first surrounding wall 12;

the second insulating sleeve 4 is arranged on the inner side, the outer side and the end surface of the second surrounding wall 22;

the portion of the first insulating kit 3 disposed inside the first surrounding wall 12 abuts against the connecting surfaces of the first annular wall 121 and the second annular wall 122, and the portion of the first insulating kit 3 disposed outside the first surrounding wall 12 abuts against the outside of the first annular wall 121.

The portion of the second insulating sleeve 4 disposed inside the second surrounding wall 22 abuts against the connecting surface between the third annular wall 221 and the second annular wall 222, and the portion of the second insulating sleeve 4 disposed outside the second surrounding wall 22 abuts against the outside of the third annular wall 221.

In one embodiment, the connection surface of the first annular wall 121 and the second annular wall 122 is parallel to the first bottom cover 11.

In one embodiment, the connection surface of the third annular wall 221 and the fourth annular wall 222 is parallel to the second bottom cover 21.

In one embodiment, the portion of the first insulating sleeve 3 disposed inside the first peripheral wall 12 coincides with the inner diametric annulus of the first annular wall 121.

In one embodiment, the portion of the second insulating sleeve 4 disposed inside the second peripheral wall 22 coincides with the inner diametric annulus of the third annular wall 221.

In one embodiment, the method for disposing the first insulating sleeve 3 on the first peripheral wall 12 is injection molding.

In one embodiment, the method for disposing the second insulating sleeve 4 on the second surrounding wall 22 is injection molding.

In one embodiment, the connection manner of the first insulating sleeve and the second insulating sleeve includes at least one of heat melting, ultrasonic welding, welding and bonding. The welding includes at least one of laser welding, ultrasonic welding, induction welding, and vibration welding, and the bonding includes bonding with glue.

In one embodiment, the contact surfaces of the first insulating sleeve 3 and the second insulating sleeve 4 are mutually matched inclined surfaces.

In one embodiment, the material of the positive electrode metal end cap 1 and the negative electrode metal end cap 2 independently comprises at least one of aluminum, iron and stainless steel. The anode metal end cover 1 and the cathode metal end cover 2 are made of the same or different materials.

In one embodiment, the materials of the first insulating sleeve 3 and the second insulating sleeve 4 independently comprise at least one of polymer materials, preferably at least one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene copolymer, polyoxymethylene, polycarbonate, polymethyl methacrylate and styrene-propylene copolymer, and more preferably at least one of polypropylene and polyethylene.

In one embodiment, the first insulating sleeve 3 and the second insulating sleeve 4 are made of different materials to distinguish the positive side from the negative side.

Further, the height of the first annular wall 121 is m, and m is 0.3-3 mm, preferably 0.7-1.5 mm.

Further, the height of the third annular wall 221 is n, and n is 0.3-3 mm, preferably 0.7-1.5 mm.

Further, the thickness of the first surrounding wall 12 and the second surrounding wall 22 is 0.1-0.3 mm independently.

Further, the thickness of the first insulating kit 3 disposed inside and outside the first surrounding wall 12 is 0.1 to 5mm, preferably 0.2 to 0.8 mm.

Further, the thicknesses of the parts of the second insulating sleeve 4 arranged on the inner side and the outer side of the second surrounding wall 22 are 0.1-5 mm, preferably 0.2-0.8 mm.

In a specific embodiment, the utility model provides a button cell, button cell includes foretell button cell shell and is located the electric core of the holding intracavity portion of button cell shell.

In one embodiment, the button cell is a lithium ion button cell, which may be a liquid button cell, a semi-solid button cell, or an all-solid button cell.

In one embodiment, the aspect ratio of the button cell is greater than 1, equal to 1, or less than 1.

In one embodiment, the cells are wound cells and/or stacked cells.

In one embodiment, the battery cell comprises a positive electrode, a negative electrode and a separator, wherein the separator is located between the positive electrode and the negative electrode.

In one embodiment, the positive electrode comprises a positive electrode material layer, the positive electrode material layer comprises a positive electrode active material, a conductive agent and a binder, and the positive electrode active material comprises at least one of ternary materials of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium manganese phosphate, nickel cobalt manganese and nickel cobalt aluminum; the conductive agent comprises acetylene black; the binder includes polyvinylidene fluoride.

In one embodiment, the negative electrode includes a negative electrode material layer including a negative electrode active material and a binder; the binder comprises polyvinylidene fluoride and/or styrene butadiene rubber.

In one embodiment, the negative active material includes at least one of lithium titanate, titanium dioxide, natural graphite, artificial graphite, carbon fiber, soft carbon, hard carbon, mesocarbon microbeads, elemental silicon, silicon oxide, and a silicon-carbon composite.

In one embodiment, the separator comprises at least one of polypropylene, polyethylene, and an alumina-plated ceramic separator.

Example one

The embodiment provides a button cell casing (see fig. 1 in front sectional view, fig. 2 in top view and fig. 3 in front view), which comprises a positive metal end cover 1 and a negative metal end cover 2, wherein the positive metal end cover 1 comprises a first bottom cover 11 and a first surrounding wall 12 arranged on one side of the first bottom cover 11, and the negative metal end cover 2 comprises a second bottom cover 21 and a second surrounding wall 22 arranged on one side of the second bottom cover 21;

the positive metal end cover 1 and the negative metal end cover 2 are oppositely arranged, so that the end of a first surrounding wall 12 is opposite to the end of a second surrounding wall 22 and are arranged at intervals, a first insulating sleeve 3 (see fig. 4) is formed on the first surrounding wall 12 in an injection molding mode, a second insulating sleeve 4 (see fig. 5) is formed on the second surrounding wall 22 in an injection molding mode, the connecting surfaces of the first insulating sleeve 3 and the second insulating sleeve 4 are mutually matched inclined surfaces, the two insulating sleeves are welded at the inclined surfaces to form an insulating shell 5 of an integrated structure in a laser welding mode, and the insulating shell 5, the positive metal end cover 1 and the negative metal end cover 2 form an accommodating cavity 6 for accommodating a battery cell;

the first surrounding wall 12 comprises a first annular wall 121 and a second annular wall 122 which are coaxial and connected in sequence along the direction away from the first bottom cover 11, the diameter of the second annular wall 122 is larger than that of the first annular wall 121, and the connection surface of the first annular wall 121 and the second annular wall 122 is parallel to the first bottom cover 11;

the second surrounding wall 22 comprises a third coaxial annular wall 221 and a fourth annular wall 222 which are connected in sequence along the direction away from the second bottom cover 21, the diameter of the fourth annular wall 222 is larger than that of the third annular wall 221, and the connecting surface of the third annular wall 221 and the fourth annular wall 222 is parallel to the second bottom cover 21;

the first insulating bush 3 is arranged on the inner side, outer side and end surface of the first surrounding wall 12, the part of the first insulating bush 3 arranged on the inner side of the first surrounding wall 12 is abutted with the connecting surface of the first annular wall 121 and the second annular wall 122 and is consistent with the inner diameter ring surface of the first annular wall 121, and the part of the first insulating bush 3 arranged on the outer side of the first surrounding wall 12 is abutted with the outer side of the first annular wall 121;

the second insulating sleeve 4 is arranged on the inner side, the outer side and the end surface of the second surrounding wall 22, the part of the second insulating sleeve 4 arranged on the inner side of the second surrounding wall 22 is abutted with the connecting surface of the third annular wall 221 and the second annular wall 222 and is consistent with the inner diameter ring surface of the third annular wall 221, and the part of the second insulating sleeve 221 arranged on the outer side of the second surrounding wall 22 is abutted with the outer side of the third annular wall 221;

the outer surface of the negative electrode metal end cover 2 is provided with two circles of pits 7, the diameter of the circumference of the inner circle of pits 7 is 8mm, the diameter of the circumference of the outer circle of pits 7 is 9mm, the pits 7 are uniformly distributed in the circumferential direction, and the grain depth of the pits 7 is 0.02 mm.

In this embodiment, the positive electrode metal end cap 1 and the negative electrode metal end cap 2 are made of stainless steel, the first insulating sleeve 3 is made of a mixture of PE plastic and an elastomer in a mass ratio of 8:2, and is white, and the second insulating sleeve 4 is made of a mixture of PP plastic and an elastomer in a mass ratio of 8:2, and is black. The outer diameters of the first bottom cover 11 and the second bottom cover 21 are both 10.9mm, the inner diameters of the first annular wall 121 and the third annular wall 221 are both 10.6mm, the heights of the first annular wall 121 and the third annular wall 221 are both 0.8mm, the thicknesses of the parts, located on the inner side and the outer side of the first surrounding wall 11, of the first insulation sleeve 3 are both 0.29mm, the thicknesses of the parts, located on the inner side and the outer side of the second surrounding wall 21, of the second insulation sleeve 4 are both 0.29mm, the thicknesses of the first surrounding wall 12 and the second surrounding wall 21 are both 0.15mm, and the distance between the outer surface of the positive metal end cover 1 and the outer surface of the negative metal end cover 2 is 5.3 mm.

The embodiment provides a button cell, and this button cell is cylindrical lithium ion button cell, and the footpath height ratio is greater than 1, including foretell button cell shell and the electric core that is located the holding chamber 6 of above-mentioned button cell shell, this electric core is coiled battery, including anodal, negative pole and barrier film, anodal and first bottom 11 welding, the negative pole welds with second bottom 21.

Example two

The embodiment provides a button cell casing (see fig. 1 in front sectional view, fig. 2 in top view and fig. 3 in front view), which comprises a positive metal end cover 1 and a negative metal end cover 2, wherein the positive metal end cover 1 comprises a first bottom cover 11 and a first surrounding wall 12 arranged on one side of the first bottom cover 11, and the negative metal end cover 2 comprises a second bottom cover 21 and a second surrounding wall 22 arranged on one side of the second bottom cover 21;

the positive metal end cover 1 and the negative metal end cover 2 are oppositely arranged, so that the end of a first surrounding wall 12 is opposite to the end of a second surrounding wall 22 and are arranged at intervals, a first insulating sleeve 3 (see fig. 4) is formed on the first surrounding wall 12 in an injection molding mode, a second insulating sleeve 4 (see fig. 5) is formed on the second surrounding wall 22 in an injection molding mode, the connecting surfaces of the first insulating sleeve 3 and the second insulating sleeve 4 are mutually matched inclined surfaces, the two insulating sleeves are connected at the inclined surfaces by glue to form an insulating shell 5 of an integral structure, and the insulating shell 5, the positive metal end cover 1 and the negative metal end cover 2 form an accommodating cavity 6 for accommodating a battery core;

the first surrounding wall 12 comprises a first annular wall 121 and a second annular wall 122 which are coaxial and connected in sequence along the direction away from the first bottom cover 11, the diameter of the second annular wall 122 is larger than that of the first annular wall 121, and the connection surface of the first annular wall 121 and the second annular wall 122 is parallel to the first bottom cover 11;

the second surrounding wall 22 comprises a third coaxial annular wall 221 and a fourth annular wall 222 which are connected in sequence along the direction away from the second bottom cover 21, the diameter of the fourth annular wall 222 is larger than that of the third annular wall 221, and the connecting surface of the third annular wall 221 and the fourth annular wall 222 is parallel to the second bottom cover 21;

the first insulating bush 3 is arranged on the inner side, outer side and end surface of the first surrounding wall 12, the part of the first insulating bush 3 arranged on the inner side of the first surrounding wall 12 is abutted with the connecting surface of the first annular wall 121 and the second annular wall 122 and is consistent with the inner diameter ring surface of the first annular wall 121, and the part of the first insulating bush 3 arranged on the outer side of the first surrounding wall 12 is abutted with the outer side of the first annular wall 121;

the second insulating sleeve 4 is arranged on the inner side, the outer side and the end surface of the second surrounding wall 22, the part of the second insulating sleeve 4 arranged on the inner side of the second surrounding wall 22 is abutted with the connecting surface of the third annular wall 221 and the second annular wall 222 and is consistent with the inner diameter ring surface of the third annular wall 221, and the part of the second insulating sleeve 221 arranged on the outer side of the second surrounding wall 22 is abutted with the outer side of the third annular wall 221.

In this embodiment, the positive electrode metal end cap 1 and the negative electrode metal end cap 2 are made of aluminum, and the first insulating sleeve 3 and the second insulating sleeve 4 are made of PP plastic. The outer diameters of the first bottom cover 11 and the second bottom cover 21 are both 10.9mm, the inner diameters of the first annular wall 121 and the third annular wall 221 are both 10.6mm, the height of the first annular wall 121 is 0.8mm, the height of the third annular wall 221 is 0.7mm, the thicknesses of the parts, located on the inner side and the outer side of the first surrounding wall 11, of the first insulating sleeve 3 are both 0.32mm, the thicknesses of the parts, located on the inner side and the outer side of the second surrounding wall 21, of the second insulating sleeve 4 are both 0.32mm, the thicknesses of the first surrounding wall 12 and the second surrounding wall 21 are both 0.2mm, and the distance between the outer surface of the positive metal end cover 1 and the outer surface of the negative metal end cover 2 is 5.5 mm.

The present embodiment provides a button cell, which is a cubic lithium ion button cell, the diameter-height ratio of which is less than 1, and which includes the button cell housing and a cell located in the accommodating cavity 6 of the button cell housing, where the cell is a stacked cell and includes a positive electrode, a negative electrode and an isolating membrane, the positive electrode is welded to the first bottom cover 11, and the negative electrode is welded to the second bottom cover 21.

The foregoing is merely an exemplary embodiment of the invention and other variations may be readily made without departing from the true scope of the invention as described in the following claims.

The applicant states that the present invention is described in detail by the above embodiments, but the present invention is not limited to the above detailed method, i.e. the present invention is not meant to be implemented by relying on the above detailed method. It should be clear to those skilled in the art that any improvement of the present invention, to the equivalent replacement of each component of the present invention and the selection of the specific mode, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims (8)

1. A button cell shell is characterized by comprising a positive metal end cover and a negative metal end cover, wherein the positive metal end cover comprises a first bottom cover and a first surrounding wall arranged on one side of the first bottom cover in a surrounding manner, and the negative metal end cover comprises a second bottom cover and a second surrounding wall arranged on one side of the second bottom cover in a surrounding manner;

the positive pole metal end cover and the negative pole metal end cover set up relatively that the tip that makes first leg and the tip of second leg are relative and the interval sets up, be provided with first insulation external member on the first leg, be provided with the insulating external member of second on the second leg, the insulating casing of formation body structure is connected at the looks junction to first insulation external member and the insulating external member of second, insulating casing forms the holding chamber with positive pole metal end cover and negative pole metal end cover for hold electric core.

2. The button cell housing according to claim 1, wherein the first insulating sleeve is disposed inside, outside and end surface of the first surrounding wall, and the second insulating sleeve is disposed inside, outside and end surface of the second surrounding wall;

the first surrounding wall comprises a first annular wall and a second annular wall which are coaxial and connected in sequence along the direction far away from the first bottom cover, and the diameter of the second annular wall is larger than that of the first annular wall;

the part of the first insulating sleeve arranged on the inner side of the first surrounding wall is abutted with the connecting surface of the first annular wall and the second annular wall, and the part of the first insulating sleeve arranged on the outer side of the first surrounding wall is abutted with the outer side of the first annular wall;

the second surrounding wall comprises a coaxial third annular wall and a coaxial fourth annular wall which are sequentially connected along the direction far away from the second bottom cover, and the diameter of the fourth annular wall is larger than that of the third annular wall;

the part of the second insulating sleeve arranged on the inner side of the second surrounding wall is abutted against the connecting surface of the third annular wall and the second annular wall, and the part of the second insulating sleeve arranged on the outer side of the second surrounding wall is abutted against the outer side of the third annular wall.

3. The button cell casing according to claim 2, wherein the thickness of the portions of the first insulating kit disposed inside and outside the first surrounding wall is independently 0.1-5 mm;

the thicknesses of the parts, arranged on the inner side and the outer side of the second surrounding wall, of the second insulating sleeve are 0.1-5 mm independently;

the height of the first annular wall is m, and the m is 0.3-3 mm;

the height of the third annular wall is n, and n is 0.3-3 mm;

the thickness of first leg and second leg is independently 0.1 ~ 0.3 mm.

4. The button cell battery shell according to claim 2, characterized in that the connection surface of the first and second annular walls is parallel to the first bottom cover, and the part of the first insulating sleeve member arranged inside the first peripheral wall is in accordance with the inner diameter ring surface of the first annular wall;

the connecting surface of the third annular wall and the fourth annular wall is parallel to the second bottom cover, and the part of the second insulating sleeve arranged on the inner side of the second surrounding wall is consistent with the inner diameter ring surface of the third annular wall.

5. The button cell casing according to claim 1, wherein the first insulating sleeve is injection molded on the first wall for wrapping the first wall;

the second insulation sleeve is formed on the second surrounding wall in an injection molding mode and used for wrapping the second surrounding wall.

6. The button cell housing according to claim 1, wherein the connection is selected from at least one of a hot melt connection, welding or adhesive.

7. The button cell casing according to claim 1, wherein the mating surfaces of the first and second insulating sleeves are mutually mating slopes.

8. A button cell battery, which is characterized in that the button cell battery comprises a button cell battery shell as defined in any one of claims 1 to 7 and a battery cell positioned in a containing cavity of the button cell battery shell;

the battery cell is a winding battery cell or a stacked battery cell;

for the winding type battery cell, the axial direction of the battery cell is vertical to the first bottom cover and the second bottom cover;

for the stacked battery cell, the stacking surface of the battery cell is parallel to the first bottom cover and the second bottom cover.

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