CN216389536U

CN216389536U - Micro battery

Info

Publication number: CN216389536U
Application number: CN202122024556.2U
Authority: CN
Inventors: 杨京松; 赵国荣; 黄凯
Original assignee: Zhuhai Micromatrix Industry Co ltd
Current assignee: Zhuhai Juneng New Energy Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-04-26
Anticipated expiration: 2031-08-25

Abstract

The utility model relates to a micro battery, which comprises a shell component and an electric core component arranged in the shell component. The electric core component comprises a first pole piece and a second pole piece which are opposite in polarity. The shell assembly comprises a shell body, a conducting strip and an insulating strip, wherein a leading-out hole is formed in the shell body, the conducting strip is arranged in the leading-out hole, and the insulating strip is arranged between the shell body and the conducting strip and is used for insulating and isolating the shell body and the conducting strip. The micro battery also comprises a first conductive adhesive electrically connected between the inner surface of the shell and the first pole piece, and/or a second conductive adhesive electrically connected between the inner surface of the conductive sheet and the second pole piece. Because the conducting resin does not need to use energy to weld the pole piece and the shell component, the integrity of the shell component can be ensured, the problems of leakage, insufficient soldering and the like caused by unstable energy are avoided, and the thinning of the shell component is facilitated.

Description

Micro battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a micro battery.

Background

Micro batteries are a type of small, high energy density batteries that are widely used in various aspects of life, such as electronic watches, bluetooth headsets, hearing aids, and other small portable electronic devices.

The conventional miniature button battery comprises a metal shell consisting of a metal top cover and a metal lower shell and a battery cell placed in the metal shell. In a traditional button battery, a positive plate and a negative plate of an electric core are respectively connected with a metal lower shell and a metal top cover in a welding mode, a positive tab and a negative tab are respectively welded on the positive plate and the negative plate, and then the positive tab and the negative tab are respectively welded on the metal lower shell and the metal top cover. When a thin material is used as the housing, the soldering connection may cause problems such as liquid leakage and insufficient soldering.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to an improved micro battery, which overcomes the above-mentioned shortcomings of the prior art.

The technical scheme adopted by the utility model for solving the technical problems is as follows: constructing a miniature battery, which comprises a shell component and an electric core component arranged in the shell component, wherein the electric core component comprises a first pole piece and a second pole piece with opposite polarities; the shell assembly comprises a shell with an extraction hole, a conducting strip arranged in the extraction hole and an insulating strip arranged between the shell and the conducting strip and used for insulating and isolating the shell and the conducting strip;

the micro battery also comprises a first conductive adhesive electrically connected between the inner surface of the shell and the first pole piece, and/or a second conductive adhesive electrically connected between the inner surface of the conductive sheet and the second pole piece.

In some embodiments, the first pole piece comprises a first coated region coated with a first active electrode material on a first current collector and a first uncoated region uncoated with the first active electrode material, the first uncoated region bonded with the first conductive glue;

the second pole piece comprises a second coating area coated with a second active electrode material on a second current collector and a second uncoated area not coated with the second active electrode material, and the second uncoated area is bonded with the second conductive adhesive.

In some embodiments, the first uncoated region is disposed at one end of the first current collector and the second uncoated region is disposed at one end of the second current collector.

In some embodiments, the housing comprises a cylindrical lower shell and an end cover covering the lower shell; the end cover, the insulating piece, the conducting strip stacks gradually the setting, the lead-out hole is formed in the end cover with on the insulating piece.

In some embodiments, the electric core assembly is made by winding, and an electric core hole is formed in the electric core assembly.

In some embodiments, the first conductive glue is adhered to an inner circumferential surface of the housing.

In some embodiments, before the micro battery is injected, a reserved gap is formed between the outer peripheral surface of the electric core assembly and the first coating area;

after the micro battery is injected and charged, the first conductive adhesive and the first coating area are clamped between the inner circumferential surface of the shell and the outer circumferential surface of the electric core assembly.

In some embodiments, the first conductive adhesive and the second conductive adhesive are respectively located at two axial ends of the core hole.

In some embodiments, the micro battery further comprises an insulating support disposed through the core hole; and two ends of the insulating support part are respectively abutted against the first conductive adhesive and the second conductive adhesive.

In some embodiments, the insulating support has a cross-sectional dimension that is less than a cross-sectional dimension of the electrical core hole.

The micro battery of the utility model has at least the following beneficial effects: because the conducting resin does not need to use energy to weld the pole piece and the shell component, the integrity of the shell component can be ensured, the problems of leakage, insufficient soldering and the like caused by unstable energy are avoided, and the thinning of the shell component is facilitated.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic perspective view of a micro-battery according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a longitudinal cross-sectional structure of the micro-battery shown in FIG. 1;

FIG. 3 is a schematic longitudinal sectional view of a micro-battery according to a second embodiment of the present invention;

fig. 4 is a schematic longitudinal sectional view of a micro battery according to a third embodiment of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "front", "back", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings or orientations and positional relationships that the products of the present invention are conventionally placed in use, are only used for convenience of describing the technical solution, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be interpreted as limiting the present invention. Furthermore, the use of the terms "vertical," "horizontal," "longitudinal," "transverse," and the like in the description of the utility model is for illustrative purposes only and does not denote a single embodiment.

It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Fig. 1-2 show a micro battery 1 according to a first embodiment of the present invention, wherein the micro battery 1 may include a housing assembly 10 and a core assembly 20 disposed in the housing assembly 10. The micro battery 1 may be a lithium ion button battery, which may be substantially in the shape of an oblate column. It is understood that in other embodiments, the micro battery 1 may have other shapes such as an elliptic cylindrical shape, a square cylindrical shape, etc.

The housing assembly 10 may include a case 11, a conductive sheet 13, and an insulation sheet 12 disposed between the case 11 and the conductive sheet 13 to insulate and isolate the case 11 and the conductive sheet 13. The shell 11 and the conducting strip 13 can be electrically connected with two poles of the electric core assembly 20 respectively.

The housing 11 may include a cylindrical lower case 111 having an opening at an upper end thereof and an end cap 112 sealingly covering the opening at the upper end of the lower case 111. The lower case 111 may have a substantially oblate cylindrical shape, i.e., the outer diameter of the lower case 111 is greater than the height thereof. In some embodiments, the height of the lower case 111 may be 0.1 to 0.9 times, for example, 0.25 to 0.7 times, the outer diameter thereof. The outer diameter of the lower case 111 may be 4.5 to 40mm, preferably 6 to 30 mm. The end cap 112 may have a circular plate shape, and an outer peripheral edge thereof is sealingly combined with an opening edge of the lower case 111. In some embodiments, the end cap 112 and the lower shell 111 may be made of a metal conductive material, such as stainless steel, aluminum, iron, etc., which can be welded by laser, and the outer periphery of the end cap 112 may be hermetically combined with the opening edge of the lower shell 111 by laser welding.

The end cap 112, the insulating sheet 12 and the conductive sheet 13 may be stacked in sequence from bottom to top. The thicknesses of the end cap 112, the insulating sheet 12 and the conducting sheet 13 can be respectively 0.02-1 mm, preferably 0.1-0.25 mm. The end cap 112 and the insulation sheet 12 are formed with a lead-out hole 110 along the longitudinal direction, so that the end cap 112 can be electrically connected with the electric core assembly 20. The central axes of the end cap 112, the insulating sheet 12, the conductive sheet 13 and the lead-out hole 110 may coincide with the central axis of the lower case 111. In other embodiments, the insulating sheet 12, the conductive sheet 13 may also be provided on the lower case 111, for example, it may also be provided on the bottom wall of the lower case 111, and accordingly, the lead-out holes are formed on the lower case 111 and the insulating sheet 12.

In some embodiments, the conductive sheet 13 may be a circular metal sheet, the insulating sheet 12 may be a circular plastic sheet, preferably a laser-fusible plastic sheet, and the end cap 112, the insulating sheet 12 and the conductive sheet 13 may be bonded together by laser welding. In other embodiments, the insulating sheet 12 and the conductive sheet 13 are not limited to be in the shape of a circular sheet, and may be in other shapes such as a square sheet and an oval sheet. The surface of the end cap 112, the conductive sheet 13 and the insulating sheet 12 may be previously surface-treated to form a plurality of grooves, and after laser welding, a portion of the insulating sheet 12 is thermally fused into the plurality of grooves, so that the bonding is tighter. In other embodiments, the end cap 112, the insulating sheet 12 and the conductive sheet 13 may be bonded together by ultrasonic welding, nano-molding, or glue bonding. In other embodiments, the insulating sheet 12 may be made of rubber, TPE, or other insulating material.

Because the cohesion between plastics and the metal has certain intensity value, after internal pressure surpassed this intensity value, plastics and metal can throw off, consequently, after the pressure of miniature battery 1 inside reached a definite value, conducting strip 13 and insulating piece 12 can throw off, realize opening the pressure release to furthest reduces battery safety hazard degree, improves battery security.

The electrode assembly 20 may include a first pole piece 21, a second pole piece 22, and a spacer 23 disposed between the first pole piece 21 and the second pole piece 22 to insulate and separate the first pole piece 21 and the second pole piece 22. The first and second pole pieces 21 and 22 have opposite polarities, for example, the first pole piece 21 is a negative pole piece, and the second pole piece 22 is a positive pole piece. In other embodiments, the first pole piece 21 may be a positive pole piece, and the second pole piece 22 may be a negative pole piece. The first pole piece 21 may include a first current collector, which may include a first coated region 211 on the first current collector coated with a first active electrode material and a first uncoated region 212 on the first current collector not coated with the first active electrode material. The second pole piece 22 may include a second current collector, which may include a second coated region 221 on which the second active electrode material is coated and a second uncoated region 222 on which the second active electrode material is not coated. The first current collector and the second current collector can be metal foils of aluminum, copper and the like. The first active electrode material and the second active electrode material can be respectively coated on one surface of the first current collector and one surface of the second current collector, or can be respectively coated on two surfaces of the first current collector and the second current collector. The first pole piece 21 and the second pole piece 22 can be connected to the housing 11 and the conductive sheet 13 through the first uncoated region 212 and the second coated region 221, respectively. With the adoption of the structure, the tabs connected with the shell 11 and the conducting strip 13 do not need to be additionally arranged on the first pole piece 21 and the second pole piece 22, so that the welding operation of the tabs and the pole pieces can be avoided.

The core assembly 20 may be made in the form of a helical winding and wherein the axis coincides with the central axis of the housing assembly 10. A core hole 24 may be further formed in the core 21 in the axial direction thereof. The first pole piece 21, the spacer 23 and the second pole piece 22 are sequentially stacked and spirally wound around a round bar-shaped winding core, the winding core is drawn out after winding is completed, a winding core hole with a central axis coincident with the central axis of the electric core component 20 is formed, and the winding core hole forms an electric core hole 24. The first uncoated region 212 and the second uncoated region 222 may be located at the winding start end or the winding completion end of the first pole piece 21 and the second pole piece 22, respectively, i.e. the ends of the first pole piece 21 and the second pole piece 22 close to or far away from the core hole 24.

The first uncoated region 212 may be mechanically and electrically connected with the inner surface of the case 11 via the first conductive paste 31. The second uncoated region 222 may be mechanically and electrically connected to the inner surface of the conductive sheet 13 via the second conductive paste 32. The conductive material in the first and second

conductive pastes

31 and 32 may include silver powder, graphite, or copper powder, which have a relatively low resistivity. Because the conductive adhesive does not need to use energy to weld the current collector and the shell assembly 10, the integrity of the shell assembly 10 can be ensured, and the problems of liquid leakage, insufficient soldering and the like caused by unstable energy are avoided.

Specifically, in the present embodiment, the second conductive paste 32 is located in the lead-out hole 110 and attached to the lower end surface of the conductive sheet 13. The second uncoated region 222 may be disposed at a winding start end of the second pole piece 22, i.e. an end of the second pole piece 22 close to the core hole 24, and attached on the second conductive adhesive 32. First conductive paste 31 may be attached to the inner circumferential surface of lower case 111. The first uncoated region 212 may be disposed at the winding end of the first pole piece 21, i.e. the end of the first pole piece 21 away from the core hole 24, and attached to the first conductive adhesive 31. The first conductive paste 31 and the first uncoated region 212 are located between the inner circumferential surface of the lower case 111 and the outer circumferential surface of the electric core assembly 20, and a predetermined gap 25 is formed between the outer circumferential surface of the electric core assembly 20 and the first uncoated region 212 before the battery is charged. After the battery is charged and charged, the outer diameter of the electric core assembly 20 is increased so that the outer circumferential surface of the electric core assembly 20 is outwardly expanded to be closely attached to the first uncoated region 212, thereby clamping the first conductive paste 31, the first uncoated region 212 between the inner circumferential surface of the lower case 111 and the outer circumferential surface of the electric core assembly 20.

In addition, in some embodiments, the viscosity of the first conductive adhesive 31 and the second conductive adhesive 32 may also decrease with the increase of the temperature after the temperature reaches a certain value, for example, decrease with the increase of the temperature after the temperature is higher than 90-120 ℃. When the temperature of the battery is increased due to short circuit and the like, the viscosity of the first conductive adhesive 31 and the second conductive adhesive 32 is reduced, so that the cell assembly 20 is partially or completely separated from the housing assembly 10, and the safety of the battery is improved.

Fig. 3 shows a micro-battery 1 according to a second embodiment of the present invention, which is different from the first embodiment mainly in that in the present embodiment, an end cap 112, an insulating sheet 12, and a conductive sheet 13 are sequentially stacked from top to bottom. The end cap 112 and the insulation sheet 12 are formed with a lead-out hole 110 along the longitudinal direction, so that the conductive sheet 13 is convenient to be externally connected with electronic components such as a circuit board or a load.

Fig. 4 shows a micro-battery 1 in a third embodiment of the present invention, which is mainly different from the first embodiment in that in this embodiment, a first conductive paste 31 may be attached to the upper end surface of the bottom wall of the lower case 111. The first uncoated region 212 may be disposed at a winding start end of the first pole piece 21, i.e. an end of the first pole piece 21 close to the core hole 24, and attached on the first conductive adhesive 31.

In addition, the micro battery 1 in the present embodiment further includes an insulating support member 33. The insulating support member 33 may be made of a hard insulating material, and the insulating support member 33 is disposed through the cell hole 24 and may be coaxial with the cell hole 24. The cross-sectional dimension of the insulating support member 33 is smaller than the cross-sectional dimension of the cell hole 24, and the cross-sectional shape of the insulating support member 33 may match the cross-sectional shape of the cell hole 24. In the present embodiment, the insulating support 33 has an elongated cylindrical shape, and the diameter of the insulating support 33 is smaller than the diameter of the core hole 24. The upper end face of the insulating support 33 may abut against the lower end face of the second uncoated region 222, thereby clamping the second uncoated region 222, the second conductive paste 32 between the upper end face of the insulating support 33 and the lower end face of the conductive sheet 13. The lower end surface of the insulating support 33 may abut against the upper end surface of the first uncoated region 212, thereby clamping the first uncoated region 212, the first conductive paste 31, between the lower end surface of the insulating support 33 and the bottom wall of the lower case 111.

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

The above examples only express the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications 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 equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A miniature battery comprising a housing assembly (10) and an electric core assembly (20) disposed within the housing assembly (10), the electric core assembly (20) comprising first and second pole pieces (21, 22) of opposite polarity; the shell assembly (10) is characterized by comprising a shell (11) formed with an extraction hole (110), a conducting strip (13) arranged in the extraction hole (110), and an insulating strip (12) arranged between the shell (11) and the conducting strip (13) and used for insulating and isolating the shell (11) and the conducting strip (13);

the micro battery further comprises a first conductive adhesive (31) electrically connected between the inner surface of the shell (11) and the first pole piece (21), and/or a second conductive adhesive (32) electrically connected between the inner surface of the conductive sheet (13) and the second pole piece (22).

2. The micro-battery according to claim 1, characterized in that the first pole piece (21) comprises a first coated area (211) coated with a first active electrode material on a first current collector and a first uncoated area (212) not coated with the first active electrode material, the first uncoated area (212) being bonded with the first conductive glue (31);

the second pole piece (22) comprises a second coating area (221) coated with a second active electrode material on a second current collector and a second uncoated area (222) not coated with the second active electrode material, and the second uncoated area (222) is bonded with the second conductive adhesive (32).

3. The micro-battery of claim 2, wherein the first uncoated region (212) is disposed at one end of the first current collector and the second uncoated region (222) is disposed at one end of the second current collector.

4. The micro-battery according to claim 2, wherein the case (11) comprises a cylindrical lower case (111) and an end cap (112) covering the lower case (111); the end cover (112), insulating piece (12), conducting strip (13) stack gradually and set up, it forms in to draw hole (110) end cover (112) with on insulating piece (12).

5. The micro-battery according to any one of claims 2 to 4, wherein the electric core assembly (20) is made in a winding manner, and an electric core hole (24) is formed in the electric core assembly (20).

6. The micro-battery according to claim 5, wherein the first conductive paste (31) is adhered to an inner circumferential surface of the case (11).

7. The micro-battery according to claim 6, wherein a predetermined gap (25) is formed between the outer circumferential surface of the core assembly (20) and the first coating region (211) before the injection of the liquid into the micro-battery;

after the micro battery is injected and charged, the first conductive adhesive (31) and the first coating area (211) are clamped between the inner circumferential surface of the shell (11) and the outer circumferential surface of the electric core assembly (20).

8. The micro battery according to claim 2, wherein the first conductive paste (31) and the second conductive paste (32) are respectively located at both axial ends of the core hole (24).

9. The micro battery according to claim 8, further comprising an insulating support (33) disposed through the core hole (24); two ends of the insulating support member (33) are respectively abutted against the first conductive adhesive (31) and the second conductive adhesive (32).

10. The micro-battery according to claim 9, wherein the insulating support (33) has a cross-sectional dimension smaller than the cross-sectional dimension of the core hole (24).