CN215988971U

CN215988971U - Steel shell button cell

Info

Publication number: CN215988971U
Application number: CN202121348483.6U
Authority: CN
Inventors: 曹琳; 梁瑾; 陈杰; 项海标
Original assignee: Dongguan Lithium Microelectronics Technology Co ltd
Current assignee: Dongguan Lithium Microelectronics Technology Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2022-03-08
Anticipated expiration: 2031-06-17

Abstract

The utility model belongs to the technical field of button cells, and particularly discloses a steel shell button cell which comprises a cover body, a shell, a core body, a pole and an insulating material, wherein the upper end surface of the shell is provided with an installation groove, the cover body is covered and installed in the installation groove, and a closed containing cavity is formed between the cover body and the shell; the core body is arranged in the closed containing cavity; the pole is arranged at one end of the shell; the insulating material is arranged between the cover body and the pole. The utility model solves the problem of poor sealing performance of the existing steel shell button cell by structural design, effectively avoids the displacement of the shell and the cover body, ensures uniform welding seams and good welding quality, ensures the packaging tightness of the steel shell button cell, does not generate gaps, and ensures that the cell has good sealing performance.

Description

Steel shell button cell

Technical Field

The utility model belongs to the technical field of button cells, and particularly relates to a steel shell button cell.

Background

With the development of portable electronic products, intelligent wearable products, medical instruments and the like, batteries are more miniaturized, so that a battery with small volume, high specific energy, good sealing property, small self-discharge and high reliability is developed, and the battery is commonly called a button battery due to the shape like a button. There are many types of button cells, among which the lithium-ion button cell is the one with the highest energy density and the highest operating voltage (plateau 3.7V, even higher, others are typically 3.0V or lower).

At present, button cells are classified according to the packaging mode, and mainly include a punch sealing mode and a cover riveting mode. The punch sealing mode is that semi-finished batteries such as a positive manganese sheet, a negative lithium sheet, diaphragm paper, electrolyte and the like which are assembled in positive and negative covers of the button battery are clamped between an upper die and a lower die of a sealing die, then a pedal switch controls a punch or a special punch similar to the punch principle to drive the sealing punch die to compress a metal part higher than a positive shell, plastic deformation is generated according to the shape of the sealing die, and the plastic deformation part generated on the circumference of the positive shell and a plastic sealing ring part of a negative electrode are forced to be tightly pressed together, so that sealing is realized. The cover body riveting mode is non-detachable connection that the riveted parts are connected together by using the rivet, namely, the rivet is inserted into the riveting hole of the riveted part, and the rivet is punched or rolled by using a punch of a press machine to deform the rivet, so that riveting is completed.

For lithium-ion button cells, the lifetime and safety of the lithium-ion button cell depends directly on the insulation of the electrolyte inside the lithium-ion button cell from the outside, in other words, it is necessary to ensure that the lithium-ion cell housing is perfectly sealed. If the sealing of the battery case is not reliably achieved, the electrolyte inside the battery case may directly contact the outside, and thus a severe chemical reaction may easily occur, causing the lithium ion battery to fail or even explode.

The existing punch sealing mode and the cover riveting mode are in the packaging process of the button cell, the packaged shell and the packaged cover are easy to shift, the edges of the shell and the cover are not aligned, gaps are finally formed, the electrolyte inside a cell shell is directly contacted with the outside, violent chemical reaction is easy to occur, the lithium ion cell is invalid, even explosion occurs, and by adopting the two packaging modes, the problem that the internal space utilization rate of the lithium ion button cell is low, and the energy density of the lithium ion button cell is low is solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: through providing a steel-shelled button cell, solved the poor problem of current steel-shelled button cell leakproofness, it has effectively avoided the emergence of casing and lid aversion phenomenon, makes the welding seam even, and welding quality is good, guarantees steel-shelled button cell's encapsulation compactness, can not produce the clearance, makes the battery have good leakproofness.

In order to achieve the purpose, the utility model adopts the following technical scheme: a steel shell button cell comprises a cover body, a shell, a core body, a pole and an insulating material, wherein the upper end surface of the shell is provided with a mounting groove, the cover body is covered and mounted in the mounting groove, and a closed containing cavity is formed between the cover body and the shell; the core body is arranged in the closed containing cavity; the pole is arranged at one end of the shell; the insulating material is arranged between the cover body and the pole.

Further, the cover body, the pole and the insulating material are arranged on the same central axis.

Further, the mounting groove is in a step shape.

Further, be provided with the utmost point post hole on the lid, be provided with on the insulating material with the hole of dodging that the utmost point post hole corresponds, wherein, the aperture in utmost point post hole is greater than the aperture in the hole of dodging.

Furthermore, the pole comprises a base body and a convex body formed by the first base body extending outwards, and the convex body penetrates through the avoiding hole and is contained in the pole hole.

Further, the convex body with the utmost point post hole and the convex body with dodge the hole and be interference fit.

Further, the cross section of the convex body is one of a circle, an ellipse or a quadrangle.

Furthermore, the cover body or the shell is provided with explosion-proof lines.

Furthermore, an insulating layer is sprayed on the side wall of the shell or one end face of the cover body and is used for preventing the anode tab from being short-circuited.

Furthermore, a first through hole communicated with the closed containing cavity is formed in the cover body, and the first through hole is used for injecting liquid.

Further, the cover body pole is of an I-shaped structure.

The utility model has the beneficial effects that: a steel shell button cell comprises a cover body, a shell, a core body, a pole and an insulating material, wherein the upper end surface of the shell is provided with a mounting groove, the cover body is covered and mounted in the mounting groove, and a closed containing cavity is formed between the cover body and the shell; the core body is arranged in the closed containing cavity; the pole is arranged at one end of the shell; the insulating material is arranged between the cover body and the pole. The utility model solves the problem of poor sealing performance of the existing steel shell button cell by structural design, effectively avoids the displacement of the shell and the cover body, ensures uniform welding seams and good welding quality, ensures the packaging tightness of the steel shell button cell, does not generate gaps, and ensures that the cell has good sealing performance.

Drawings

Fig. 1 is a schematic structural diagram of a steel-can button cell according to an embodiment;

fig. 2 is a second schematic structural diagram of a steel-can button cell in the embodiment;

fig. 3 is a third schematic structural diagram of a steel-case button cell in the embodiment;

FIG. 4 is a fourth schematic diagram of a steel-can button cell in accordance with one embodiment;

FIG. 5 is a fifth schematic view of a steel-can button cell in accordance with one embodiment;

FIG. 6 is a sixth schematic view of a steel-can button cell according to one embodiment;

FIG. 7 is a seventh schematic structural view of a steel-can button cell according to one embodiment;

fig. 8 is an eighth schematic structural view of a steel-can button cell in accordance with an embodiment;

FIG. 9 is a schematic structural view of a housing according to an embodiment;

fig. 10 is a schematic structural diagram of a cover in an embodiment.

Wherein: 1-a cover body; 2-a shell; 3-a core body; 4-pole column; 41-a substrate; 42-convexity; 5-an insulating material; 6-a first via; 7-positive pole tab; 8-a negative electrode tab; 9-explosion-proof line.

Detailed Description

In the description of the application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; unless otherwise specified or indicated, the terms "welding", "securing", and the like are to be construed broadly, e.g., "welding" may be a fixed weld, a removable weld, an integral weld, or an electrical weld; "welded" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "welded," "secured," and "fixed" are to be construed broadly, e.g., as meaning fixedly welded, detachably welded, or integrally formed; the welding can be mechanical welding or electric welding; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

As shown in fig. 1 to 10, the button cell with a steel case provided by the utility model comprises a cover body 1, a case body 2, a core body 3, a pole 4 and an insulating material 5, wherein an installation groove is formed on the upper end surface of the case body 2, the cover body 1 is covered and installed in the installation groove, and a sealed cavity is formed between the cover body 1 and the case body 2; the core body 3 is arranged in the closed cavity; the pole 4 is arranged at one end of the shell 2; the insulating material 5 is disposed between the cover 1 and the pole 4. The utility model solves the problem of poor sealing performance of the existing steel-shell button cell by structural design, effectively avoids the displacement of the shell 2 and the cover body 1, ensures uniform welding seams and good welding quality, ensures the sealing tightness of the steel-shell button cell, does not generate gaps and ensures that the cell has good sealing performance.

In the present embodiment, the shape of the battery includes, but is not limited to, a square, a circle, an ellipse, a profile, and the like. The insulating material 5 includes, but is not limited to, natural rubber, styrene-butadiene rubber, polybutadiene rubber, chloroprene rubber, polyisoprene rubber, nitrile rubber, butyl rubber, ethylene-propylene rubber, urethane rubber, chlorosulfonated polyethylene rubber, chlorinated polyethylene rubber, silicone rubber, fluorine rubber, polysulfide rubber, polyacrylate rubber, polyether rubber, hydrogenated nitrile rubber, fluorinated phosphazene, perfluoroether, triazine rubber, borosilicate rubber, polyvinylidene chloride resin, polyvinylidene fluoride resin, polystyrene resin, nylon resin, polymethyl methacrylate resin, polycarbonate resin, polytetrafluoroethylene, polyurethane, ABS resin, vinyl acetate resin, polyvinyl chloride resin, polyurethane thermoplastic elastomer, polyolefin thermoplastic elastomer, styrene thermoplastic elastomer, and polyester thermoplastic elastomer.

Offer a mounting groove in the course of working of casing 2 in last edge, the cooperation installation between lid 1 and this mounting groove, the mounting groove is the ladder shape, the shape and the size of lid 1 and mounting groove mutually support promptly, make casing 2 and lid 1 in welding process, can realize fast that the location of lid 1 is placed, improve the welding face laminating degree of lid 1 and casing 2, during the welding, apply pressure slightly, can make in close contact with between lid 1 and the casing 2, can not produce the clearance, can not take place to shift yet and then avoided the problem that the edge of lid 1 and casing 2 can not align, make the battery have good leakproofness. In this embodiment, the cover 1 and the case 2 are combined, and the traditional punch sealing mode and the cover 1 riveting mode are replaced by a mode of extruding and bonding the insulating material 5 and the positive and negative steel sheets, so that the production efficiency of the steel-shell button cell and the sealing property and the insulating property of the steel-shell button cell are improved.

Preferably, the cover 1, the pole 4 and the insulating material 5 are arranged with the same central axis. The difficulty of location installation has been reduced, adopts this kind of structural design, and the encapsulation of being convenient for can improve the leakproofness, avoids the inside electrolytic material of casing 2 directly to make lithium ion battery inefficacy and the explosion phenomenon with external contact.

As shown in fig. 10, in the present embodiment, the cover body 1, the pole 4 and the insulating material 5 may also be designed as: the polar column 4 and the insulating material 5 are arranged on the same central axis, and the cover body 1 and the polar column 4, and the cover body 1 and the insulating material 5 are eccentrically arranged.

Preferably, the cover body 1 is provided with a pole column hole, the insulating material 5 is provided with an avoiding hole corresponding to the pole column hole, wherein the aperture of the pole column hole is larger than that of the avoiding hole, the pole column 4 comprises a base body 41 and a convex body 42 formed by the outward extension of the first base body 41, the convex body 42 penetrates through the avoiding hole and is accommodated in the pole column hole, and the convex body 42, the pole column hole, the convex body 42 and the avoiding hole are in interference fit.

In this embodiment, the convex body 42 may protrude from the upper end surface of the cap body 1, and may be parallel to the upper end surface of the cap body 1 or recessed in the upper end surface of the cap body 1. The post hole with dodge the hole and set up for same central axis, the post hole with dodge the hole and contain but not be limited to square, circular, oval and dysmorphism isotructure, and the post hole can be seted up on 1 surperficial optional position of lid.

The insulating material 5 is arranged between the cover body 1 and the pole 4, the diameter of the pole 4 is larger than that of a pole hole formed in the cover body 1 and that of a avoidance hole formed in the insulating material 5, and the insulating material 5 can seal a gap between the cover body 1 and the pole 4 in an extrusion bonding mode;

preferably, the cross-section of the spur 42 is one of circular, elliptical, or quadrilateral. In the present embodiment, the cross section of the convex body 42 is preferably circular, and the cross section of the convex body 42 may also be selected to be oval or quadrilateral, etc., and those skilled in the art can reasonably modify the convex body 42 based on the present application, and the convex body is not limited to a cylinder, an oval cylinder or a quadrilateral, and may also be irregular bodies with different shapes.

Preferably, the cover body 1 or the shell body 2 is provided with an explosion-proof line 9. The scored portion may be broken under a certain internal pressure, thereby securing the safety of the battery.

In the embodiment, the laser etching explosion-proof lines 9 are adopted on the inner surface or the outer surface of the bottom of the shell 2, so that the safety of the battery under extreme abuse conditions can be improved, gas is released in advance, and dangerous accidents such as explosion, fire and the like caused by further thermal runaway of the battery are prevented.

Preferably, an insulating layer is sprayed on the side wall of the shell 2 or one end face of the cover body 1, the insulating layer is used for preventing the anode tab 7 from being short-circuited, a first through hole 6 communicated with the closed containing cavity is formed in the cover body 1, and the first through hole 6 is used for injecting liquid.

In this embodiment, the liquid injection hole is sealed by a sealing nail after liquid injection, the sealing nail is removed after formation, and the gas is exhausted, and a round stainless steel sheet is welded on the liquid injection hole by laser for sealing the liquid injection hole. The metal nickel welding sheet is used as a cathode leading-out end and is welded on the shell 2 by adopting laser, so that the metal nickel welding sheet is convenient to be soldered with a lead of an external circuit to realize electric connection.

As shown in fig. 1 to 4, the terminal post 4 is a boss structure with a central portion protruding upwards, and the boss structure is a hollow boss or a solid boss; as shown in fig. 5-6, the pole 4 is of an i-shaped structure, the i-shaped structure is adopted, the pole 4 is clamped and sleeved in the pole hole formed in the cover body 1, so that the upper end and the lower end of the pole 4 can seal the pole hole, and the insulating material 5 clamped between the pole 4 and the cover body 1 is matched, so that the sealing performance of the cover body 1 and the shell body 2 is further improved, the contact between electrolyte in the battery shell and the outside is avoided, the failure probability of the lithium ion battery is reduced, and the explosion phenomenon can be prevented; as shown in fig. 7 to 8, the pole 4 has a circular block structure.

The utility model relates to a production and manufacturing method of a steel shell button cell, which comprises the following steps:

s1, forming a battery cell by winding or laminating the positive plate, the negative plate and the isolating film;

and S2, respectively selecting the positive and negative electrode tabs 8 as aluminum strips and copper nickel plating strips, welding the positive and negative electrode tabs 8 on the empty foils of the corresponding pole pieces by adopting a welding mode, and then leading the positive and negative electrode tabs 8 out of the battery cell.

The method comprises the following specific steps: the positive electrode tab 7 is welded on a positive steel sheet (the material of the positive steel sheet is one of aluminum, nickel or stainless steel) by ultrasonic welding, resistance welding or laser welding, the negative electrode is directly welded inside the shell 2 by resistance welding or laser welding, and non-welding points of the aluminum strip are subjected to insulation treatment in a way including but not limited to hot-pressing PP glue, pasting insulating gummed paper, coating insulating glue and the like;

s3, the pole 4 is compounded with the side wall of the shell 2 or the cover body 1 by adopting the insulating material 5, and the side wall of the shell 2 or the surface of the pole 4 facing the inside of the battery cell is sprayed with a thin insulating layer or is covered by adhesive tape in a plastic spraying mode, so that the short circuit caused by the fact that the positive pole tab 7 contacts the stainless steel on the pole 4 is prevented.

The method comprises the following specific steps: the compounding mode of the pole 4 and the shell 2 or the pole 4 and the cover body 1 is one of injection molding, glue adhesion, hot-press compounding, ultrasonic welding, spray molding solidification and high-temperature curing agent; in the compounding process, the insulating material 5 needs to reserve an avoiding hole which is arranged along the same central axis with the pole hole.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should understand that the embodiments as a whole may be combined as appropriate to form other embodiments understood by those skilled in the art.

Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the utility model as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A steel-shell button cell is characterized in that: comprises that

A cover body (1),

the portable air conditioner comprises a shell (2), wherein an installation groove is formed in the upper end face of the shell (2), a cover body (1) is installed in the installation groove in a covering mode, and a sealed containing cavity is formed between the cover body (1) and the shell (2);

the core body (3), the said core body (3) is set up in the said closed volume cavity;

the pole (4), the pole (4) is arranged at one end of the shell (2);

the insulation material (5), the insulation material (5) is arranged between the cover body (1) and the pole (4).

2. The button cell with steel case as defined in claim 1, wherein: the cover body (1), the pole (4) and the insulating material (5) are arranged on the same central axis.

3. The button cell with steel case as defined in claim 1, wherein: be provided with the utmost point post hole on lid (1), be provided with on insulating material (5) with the hole of dodging that the utmost point post hole corresponds, wherein, the aperture in utmost point post hole is greater than the aperture in the hole of dodging.

4. The button cell with steel case as defined in claim 1, wherein: the mounting groove is in a step shape.

5. The button cell with steel case as defined in claim 3, wherein: the pole post (4) comprises a base body (41) and a convex body (42) formed by extending the base body (41) outwards, and the convex body (42) penetrates through the avoidance hole and is contained in the pole post hole.

6. The button cell with steel case as defined in claim 5, wherein: the convex body (42) and the pole column hole and the convex body (42) and the avoiding hole are in interference fit.

7. The button cell with steel case as defined in claim 5, wherein: the cross section of the convex body (42) is one of circular, oval or quadrilateral.

8. The button cell with steel case as defined in claim 1, wherein: the cover body (1) or the shell (2) is provided with anti-explosion lines (9).

9. The button cell with steel case as defined in claim 1, wherein: the insulating layer is sprayed on the side wall of the shell (2) or one end face of the cover body (1), and the insulating layer is used for preventing the anode tab (7) from being short-circuited.

10. The button cell with steel case as defined in claim 1, wherein: the cover body pole column (4) is of an I-shaped structure.