CN211629137U

CN211629137U - Button cell

Info

Publication number: CN211629137U
Application number: CN202020143822.6U
Authority: CN
Inventors: 辛汉帅; 赵国荣; 黄凯; 欧阳巍
Original assignee: Zhuhai Weiju Industrial Co ltd
Current assignee: Zhuhai Juneng New Energy Co ltd
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2020-10-02
Anticipated expiration: 2030-01-21

Abstract

The utility model relates to a button cell, which comprises a hard insulating shell, an electric core and at least two electric conductors, wherein the electric core is arranged in the shell and comprises at least one positive plate, at least one negative plate and at least one isolating plate arranged between the at least one positive plate and the at least one negative plate; the shell is provided with at least two lead-out holes in a penetrating mode, the at least two conductors are arranged in the at least two lead-out holes in a sealing mode respectively, and the at least two conductors are electrically connected with the at least one positive pole piece and the at least one negative pole piece respectively. The utility model discloses well button cell's shell is stereoplasm insulating casing, and the non-conducting, its outside is difficult to take place the short circuit.

Description

Button cell

Technical Field

The utility model relates to a battery technology field, more specifically say, relate to a button cell.

Background

Button cells are widely used in various aspects of life, particularly in small portable electronic devices such as bluetooth headsets and hearing aids. The casing of the existing button cell is generally composed of two metal casing halves, which are respectively used as the positive and negative electrodes of the cell. However, short circuit is easily generated outside the metal case, and the metal case is easily oxidized during storage and use, thereby causing leakage, thereby affecting the quality and service life of the battery.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in that, to the above-mentioned defect of prior art, a button cell of short circuit is difficult to take place in outside is provided.

The utility model provides a technical scheme that its technical problem adopted is: constructing a button battery, which comprises a hard insulating shell, a battery cell and at least two electric conductors, wherein the battery cell is arranged in the shell and comprises at least one positive plate, at least one negative plate and at least one isolating plate arranged between the at least one positive plate and the at least one negative plate;

the shell is provided with at least two lead-out holes in a penetrating mode, the at least two conductors are arranged in the at least two lead-out holes in a sealing mode respectively, and the at least two conductors are electrically connected with the at least one positive pole piece and the at least one negative pole piece respectively.

In some embodiments, the at least two electrical conductors are both metallic conductive strips, and the housing is a plastic housing.

In some embodiments, the plastic comprises at least one of PTFE, PEEK, PEK.

In some embodiments, the housing comprises a lower shell with an opening at the top and a matching upper shell, and the upper shell and the lower shell are respectively injection molded.

In some embodiments, the upper case has a flat plate shape, and a peripheral edge of the upper case is hermetically combined with an opening edge of the lower case by laser welding.

In some embodiments, the at least two electrical conductors are each integrally joined to the housing by injection molding.

In some embodiments, the peripheral wall of each of the conductive bodies combined with the housing is formed with a plurality of recesses by chemical etching or laser etching.

In some embodiments, the number of recesses are formed by chemical etching or laser etching.

In some embodiments, the housing is provided with a liquid injection hole for injecting the electrolyte into the housing.

In some embodiments, the housing is in an oblate cylindrical shape, the electric core is disposed in the housing in a spiral winding manner, and a central axis of the electric core coincides with a central axis of the housing.

Implement the utility model discloses following beneficial effect has at least: the shell of the button cell is a hard insulating shell which is not conductive, and the external part of the shell is not easy to generate short circuit.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic perspective view of a button cell according to a first embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the button cell shown in FIG. 1;

fig. 3 is a schematic cross-sectional view of a button cell in a second embodiment of the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1-2 show a button cell in a first embodiment of the present invention, which may be a solid-state battery, a semi-solid-state battery or a liquid-state battery, and may include a sealed hard insulating housing 1, a battery cell 2 disposed in the housing 1, and two electrical conductors 3 sealingly disposed on the housing 1. The two conductors 3 are respectively electrically connected with the positive electrode and the negative electrode of the battery core 2, are respectively used as positive and negative leading-out electrodes of the button battery, and are used for external connection of electronic components such as a circuit board or a load. Since the case 1 is not electrically conductive, short circuit does not easily occur outside thereof. It is to be understood that the number of the conductors 3 is not limited to two, and two or more may be applied.

The electric core 2 can be arranged in the shell 1 in a spiral winding mode, and the central axis of the electric core can coincide with the central axis of the shell 1. The battery cell 2 may include at least one positive electrode tab 21, at least one negative electrode tab 22, and at least one spacer 23 disposed between the at least one positive electrode tab 21 and the at least one negative electrode tab 22. Generally, the positive electrode sheet 21 is made of a semiconductor material such as lithium cobaltate, and the negative electrode sheet 22 is made of a conductor material such as graphite. The two conductors 3 may be connected to the at least one positive electrode tab 21 and the at least one negative electrode tab 22, respectively, through electrode leads. In other embodiments, the battery cell 2 may also be in the form of a laminate.

The housing 1 may in some embodiments be a rigid plastic housing, which may be made of laser weldable plastic such as PTFE, PEEK, PEK, etc. The plastic shell is light in weight, does not react with the electrolyte and is not easy to leak. The thickness of the housing 1 may be 0.1-1 mm. The housing 1 may be substantially in the form of a flat cylinder with a diameter dimension greater than its height dimension. In some embodiments, the height of the housing 1 may be 0.1-0.9 times, preferably 0.25-0.7 times, its diameter.

The housing 1 may include a cylindrical lower shell 12 having an opening at the top and a circular flat upper shell 11 matching the lower shell in some embodiments. The upper case 11 and the lower case 12 are respectively injection-molded, and the periphery of the upper case 11 may be hermetically combined with the opening edge of the lower case 12 by laser welding. The upper shell 11 may also be provided with a liquid injection hole 112 for injecting electrolyte into the outer shell 1. The button cell may further include a sealing member (not shown) for sealing the injection hole 112 after the injection is completed.

Two lead-out holes 111 are formed through the upper case 11, and the two conductors 3 are hermetically disposed in the two lead-out holes 111, respectively. The conductor 3 can be made of stainless steel, aluminum, iron, copper and other metal conductive materials. The conductive body 3 may be in the form of a disc, and may have a thickness smaller than that of the upper case 11. In some embodiments, the thickness of the electrical conductor 3 may be 0.05-0.2 mm. It is understood that in other embodiments, the thickness of the conductive body 3 may be equal to the thickness of the upper shell 11, or slightly larger than the thickness of the upper shell 11.

The electric conductor 3 may be integrally coupled to the upper case 11 by injection molding. The bonding force between the conductor 3 and the upper case 11 at the time of injection molding can be increased by increasing the surface roughness of the peripheral wall where the conductor 3 and the upper case 11 are bonded. In some embodiments, the peripheral wall of the conductive body 3 combined with the upper shell 11 may be formed with a plurality of recesses 31 by chemical etching or laser etching, and when injection molding, a portion of the plastic upper shell 11 may be melted into the recesses 31, thereby making the combination more compact. In other embodiments, the conductive body 3 and the upper shell 11 may also be combined together by laser welding, ultrasonic welding, nano-injection molding, glue bonding, or the like.

Fig. 3 shows a button cell according to a second embodiment of the present invention, which, in comparison with the first embodiment, further includes two sealing bodies 4 respectively and sealingly inserted between the hole walls of the two lead-out holes 111 and the two electric conductors 3. The sealing body 4 can be made of flexible materials such as silica gel and rubber, and can be in interference fit between the hole wall of the leading-out hole 111 and the electric conductor 3, so that the sealing performance and the combination stability can be improved.

In this embodiment, the upper case 11 may include a flat plate-shaped wall portion 110 and two extending portions 113 extending from a surface of the wall portion 110 away from the battery cell 2. The angle between the extension 113 and the wall 110 may be 30-150, preferably 90. The lead-out hole 111 penetrates the wall portion 110 and the extending portion 113, and the sealing body 4 is inserted into the lead-out hole 111 with interference in the longitudinal direction. By providing the extension portion 113, the contact area between the sealing body 4 and the upper case 11 can be increased, and the bonding strength can be increased. The diameter of the extraction hole 111 may be 4mm or less. Preferably, the aperture of the lead-out hole 111 may be approximately 5% -35% of the diameter of the housing 1.

The extension 113 may include a pressing portion 114 recessed inward in some embodiments, and the pressing portion presses the sealing body 4 to elastically deform, so as to lock and fix the sealing body 4 in the leading-out hole 111 and prevent the sealing body from falling off. The pressing portion 114 may be formed by an end of the extending portion 113 away from the wall portion 110 being recessed inward. In other embodiments, the pressing portion 114 may be formed at other positions of the extending portion 113, for example, by recessing a middle portion of the extending portion 113 inward.

The two ends of the sealing body 4 can respectively extend out of the leading-out holes 111, the whole height of the sealing body 4 can be 0.5-5mm, and the height of the two ends respectively extending out of the leading-out holes 111 can be below 1 mm. Because the sealing body 4 is flexibly and tightly plugged in the leading-out hole 111, the part of the sealing body 4 positioned in the leading-out hole 111 is extruded and shrunk, and the parts of the two ends of the sealing body 4 extending out of the leading-out hole 111 expand and reset, so that the sizes of the extending parts of the two ends are larger than that of the leading-out hole 111, and the sealing body 4 is locked. In addition, because the cohesion between seal 4 and the epitheca 11 has certain intensity value, after button cell internal pressure exceeded this intensity value, seal 4 and epitheca 11 can throw off, realize opening the pressure release to furthest reduces battery safety hazard degree, improves battery security.

The conductor 3 may be made of a metal conductive material and may have a flexible or rigid strip-like column shape. The electric conductor 3 is along vertically wearing to locate in the seal 4, and outside the one end (upper end) that electric conductor 3 deviates from electric core 2 can stretch out seal 4, other end (lower extreme) can level or stretch out outside seal 4 with seal 4. A certain gap is formed between the lower end of the electric conductor 3 and the electric core 2, which is beneficial to heat insulation and provides a space for thermal expansion of the electric core 2.

When this external circuit board of button cell, can correspond extension 113 on the circuit board and seted up and dodge the hole, through should dodging hole and mutual grafting of extension 113 to effectively combine with the circuit board space, promote electric core energy density, in addition, still can be convenient for the installation and the location of circuit board. In other embodiments, the extending portion 113 may also extend from the surface of the wall portion 110 toward the battery cell 2.

It is to be understood that the above-described respective technical features may be used in any combination without limitation.

The above examples only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A button battery is characterized by comprising a hard insulating shell (1), an electric core (2) and at least two electric conductors (3), wherein the electric core (2) is arranged in the shell (1), and the electric core (2) comprises at least one positive pole piece (21), at least one negative pole piece (22) and at least one isolating piece (23) arranged between the at least one positive pole piece (21) and the at least one negative pole piece (22);

the shell (1) is provided with at least two lead-out holes (111) in a penetrating mode, the at least two conductors (3) are respectively and hermetically arranged in the at least two lead-out holes (111) and integrally combined on the shell (1), and the at least two conductors (3) are respectively and electrically connected with the at least one positive pole piece (21) and the at least one negative pole piece (22).

2. Button cell according to claim 1, wherein said at least two electrical conductors (3) are both metallic conductive strips and said casing (1) is a plastic casing.

3. Button cell according to claim 2, wherein the plastic comprises at least one of PTFE, PEEK, PEK.

4. Button cell according to claim 2, wherein the housing (1) comprises a lower shell (12) with an opening at the top and a matching upper shell (11), wherein the upper shell (11) and the lower shell (12) are respectively injection molded.

5. Button cell according to claim 4, wherein the upper case (11) has a flat plate shape, and the periphery of the upper case (11) is hermetically joined to the open edge of the lower case (12) by laser welding.

6. Button cell according to any of the claims 2 to 5, wherein said at least two electrical conductors (3) are integrally joined to said housing (1) by injection molding.

7. Button cell according to claim 6, wherein each conductor (3) is provided with a plurality of recesses (31) in the peripheral wall thereof engaging with the housing (1).

8. Button cell according to claim 7, wherein said number of recesses (31) is formed by chemical etching or laser etching.

9. Button cell according to any of claims 1 to 5, characterised in that the casing (1) is provided with an injection hole (112) for injecting electrolyte into the casing (1).

10. Button battery according to any of claims 1-5, characterized in that the housing (1) is in the shape of an oblate cylinder, the cell (2) is arranged in the housing (1) in the form of a spiral winding, and the central axis of the cell (2) coincides with the central axis of the housing (1).