CN113611956A

CN113611956A - Micro battery

Info

Publication number: CN113611956A
Application number: CN202110867152.1A
Authority: CN
Inventors: 杨京松; 赵国荣; 黄凯; 欧阳巍
Original assignee: Zhuhai Micromatrix Industry Co ltd
Current assignee: Zhuhai Micromatrix Industry Co ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2021-11-05

Abstract

The invention relates to a micro battery, which comprises a shell and a battery cell arranged in the shell, wherein the battery cell comprises a first electrode assembly and a second electrode assembly with opposite polarities. The micro battery also comprises an insulating sealing component and at least one electrode lead-out body which is hermetically arranged on the insulating sealing component in a penetrating way, and each electrode lead-out body is connected with the first electrode component or the second electrode component and is led out to the outside of the shell. The shell comprises an end wall, the insulating sealing assembly comprises at least one first sealing part attached to the end wall, and at least one first through hole for the at least one electrode lead-out body to penetrate through is formed in the at least one first sealing part. The structural configuration of the insulating and sealing assembly can greatly reduce the stacking height of the battery.

Description

Micro battery

Technical Field

The invention 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. How to reduce the structural size of the battery and improve the space utilization rate is a technical problem which needs to be solved urgently at present.

Disclosure of Invention

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 invention for solving the technical problems is as follows: constructing a micro battery comprising a housing and a cell disposed within the housing, the cell comprising first and second electrode assemblies of opposite polarity; the micro battery also comprises an insulating sealing component and at least one electrode lead-out body which is hermetically arranged on the insulating sealing component in a penetrating way, and each electrode lead-out body is connected with the first electrode component or the second electrode component and is led out to the outside of the shell; the shell comprises an end wall, the insulating sealing assembly comprises at least one first sealing part attached to the end wall, and at least one first through hole for the at least one electrode lead-out body to penetrate through is formed in the at least one first sealing part.

In some embodiments, the first sealing portion is formed by stacking at least two insulating layers.

In some embodiments, the insulating layers are sheet-shaped, and the thickness of each insulating layer is 0.02-1 mm.

In some embodiments, the at least two insulating layers are made of the same or different materials.

In some embodiments, the insulating layer is made of at least one of plastic, rubber, TPE, ceramic, and glass.

In some embodiments, the insulating layer of the at least two insulating layers, which is in contact with the end wall and/or the electrode lead-out body, is made of a soft insulating material.

In some embodiments, the end wall is provided with at least one lead-out hole, and the insulating and sealing assembly further comprises at least one second sealing part arranged in the at least one lead-out hole in a penetrating mode, and the at least one second sealing part is provided with at least one second through hole for the at least one electrode lead-out body to penetrate through.

In some embodiments, the at least one second sealing portion is integrated with the at least one first sealing portion, or the at least one second sealing portion is provided separately from the at least one first sealing portion.

In some embodiments, the end wall may be electrically conductive, the first electrode assembly being electrically connected to the at least one electrode lead, and the second electrode assembly being electrically connected to the end wall.

In some embodiments, the micro battery includes at least two electrode lead-outs, and the at least two electrode lead-outs are electrically connected to the first electrode assembly and the second electrode assembly, respectively.

In some embodiments, the housing further includes a cylindrical lower case, the end wall is in a flat plate shape and covers the opening of the lower case, and the outer periphery of the end wall is sealingly joined to the edge of the opening of the lower case.

The micro battery of the invention has at least the following beneficial effects: the structural configuration of the insulating and sealing assembly can greatly reduce the stacking height of the battery; in addition, the electrode lead-out body can be directly connected with the terminal equipment, thereby reducing the welding process.

Drawings

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

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

FIG. 2 is a schematic cross-sectional view of the insulation sealing assembly of FIG. 1;

FIG. 3 is a schematic cross-sectional exploded view of the insulation sealing assembly of FIG. 2;

FIG. 4 is a first seal in an alternative embodiment of the invention

FIG. 5 is a schematic longitudinal sectional view of a micro-battery according to a second embodiment of the present invention;

fig. 6 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 invention 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 to 3 show a micro battery 1 according to a first embodiment of the present invention, wherein the micro battery 1 may be a lithium ion button battery, which may be substantially in the shape of an oblate cylinder. It is understood that in other embodiments, the micro battery 1 may have other shapes such as a square column, an oval column, etc.

The micro battery 1 may include a case 10, a battery cell 20, an insulation sealing assembly 30, and an electrode lead-out body 40. The battery cell 20 is disposed in the casing 10 and may be disposed coaxially with the casing 10, and may include a first electrode assembly 21, a second electrode assembly 22, and a separation assembly 23 disposed between the first electrode assembly 21 and the second electrode assembly 22 to insulate and separate the first electrode assembly 21 from the second electrode assembly 22. The polarities of the first electrode assembly 21 and the second electrode assembly 22 are opposite, for example, the first electrode assembly 21 is a negative electrode, and the second electrode assembly 22 is a positive electrode; alternatively, the first electrode assembly 21 is a positive electrode and the second electrode assembly 22 is a negative electrode. The electrode lead-out body 40 has first and second ends disposed opposite to each other, the first end being connected to the first electrode assembly 21. The second end is drawn out to the outside of the housing 10 and may leak out of the insulating sealing member 30, so that the terminal device may be directly or indirectly connected. The insulating seal assembly 30 is hermetically wrapped around the electrode lead-out body 40 to insulate the electrode lead-out body 40 from the case 10.

In some embodiments, the core 20 may be made in the form of a spiral winding. The first electrode assembly 21, the second electrode assembly 22, and the separator assembly 23 may include at least one first conductive sheet, at least one second conductive sheet, and at least one insulating separator, respectively. The first conducting strip, the insulating spacer and the second conducting strip are sequentially stacked and wound around a round rod-shaped winding core, and then the winding core is drawn out to form a cell hole 24 with a central axis coinciding with that of the cell 20. In other embodiments, the battery cell 20 may also be made in a laminated form.

The housing 10 may be generally cylindrical, and in some embodiments, the height of the housing 10 may be 0.1 to 0.9 times, such as 0.25 to 0.7 times, its outer diameter. The can 10 may be made of a conductive material such as metal, and may be electrically connected to the second electrode assembly 22. The housing 10 has an end wall 121, and the end wall 121 is provided with a lead-out hole 120 through which the electrode lead-out body 40 passes. The insulating sealing assembly 30 may include a first sealing portion 31 and a second sealing portion 32 connected to the first sealing portion 31, and the first sealing portion 31 and the second sealing portion 32 may respectively have a first through hole 310 and a second through hole 320 through which the electrode lead-out body 40 passes. The first sealing portion 31 may be in sealing engagement with an end face of the end wall 121 facing toward or away from the battery cell 20. The electrode lead-out body 40 and the insulating seal assembly 30 may be respectively assembled into the battery as separate components; alternatively, the electrode lead-out body 40 and the insulating seal member 30 may be combined into one unit and then assembled into a battery.

In some embodiments, the first sealing portion 31 may be formed by stacking at least two insulating layers 311. The insulating layer 311 may have a sheet shape, and the cross section of the insulating layer 311 may have a regular or irregular shape such as a circle, a square, or the like. The at least two insulating layers 311 may have the same thickness or different thicknesses, and the thickness of each insulating layer 311 may be between 0.02 mm and 1 mm. The insulating seal assembly 30 is structurally configured to reduce the stack height of the cells as much as possible.

The insulating layer 311 is made of an insulating material, for example, it may be made of at least one of plastic, rubber, TPE, ceramic, and glass. The at least two insulating layers 311 constituting the first sealing portion 31 may be made of the same material. In other embodiments, the materials of the at least two insulating layers 311 forming the first sealing portion 31 may also be different. For example, the at least two insulating layers 311 may be made of hard materials and soft materials alternately, so that the first sealing portion 31 has good sealing performance and sufficient hardness. For another example, the insulating layer 311 in contact with the end wall 121 and/or the electrode lead-out body 40 is made of a soft material, and the other insulating layers 311 are made of a soft or hard material.

Specifically, in the present embodiment, the first sealing portion 31 is formed by stacking two insulating layers 311. The two-layered insulating layer 311 includes a first-layered insulating layer 3111 located at an upper portion and a second-layered insulating layer 3112 located at a lower portion. The first insulating layer 3111 is bonded to the end wall 121 in a sealing manner, and a receiving groove 3101 for receiving the electrode lead-out body 40 and a via hole 3102 for passing the electrode lead-out body 40 may be formed on the first insulating layer 3111. The through hole 3102 penetrates the first insulating layer 3111 along the longitudinal direction and is correspondingly communicated with the second through hole 320, and the containing groove 3101 extends from one lateral side of the first insulating layer 3111 along the lateral direction inwards to be communicated with the through hole 3102. The bottom of the accommodation groove 3101 is open, facilitating placement of the electrode lead-out body 40. The electrode lead-out body 40 may be placed in the receiving groove 3101 through the bottom opening of the receiving groove 3101, and the second end of the electrode lead-out body 40 passes through the via hole 3102. The second insulating layer 3112 is bonded to the first insulating layer 3111 in a sealed manner, so that the electrode lead-out body 40 is sandwiched and fixed between the second insulating layer 3112 and the first insulating layer 3111, and the bottom of the accommodation groove 3101 and the via hole 3102 are sealed.

The second sealing portion 32 is made of an insulating material, for example, it may be made of at least one of plastic, rubber, TPE, ceramic, and glass. The second sealing portion 32 is inserted into the lead-out hole 120, and may be integrated with the first sealing portion 31 or may be separately provided from the first sealing portion 31. The outer peripheral surface of the second sealing portion 32 can be in sealing engagement with the hole wall of the lead-out hole 120 to seal the lead-out hole 120. In other embodiments, a gap may be formed between the outer peripheral surface of the second sealing portion 32 and the hole wall of the lead-out hole 120, and the lead-out hole 120 may be closed by the fitting seal between the first sealing portion 31 and the end wall 121. The lower end face of the second sealing portion 32 abuts the upper end face of the first sealing portion 31, and the upper end face of the second sealing portion 32 may be flush with the upper end face of the end wall 121. In other embodiments, the upper end surface of the second sealing portion 32 may also protrude from the upper end surface of the end wall 121.

The electrode extractor 40 may have a regular or irregular shape such as a sheet shape or a column shape, and may have rigidity or flexibility. The electrode lead-out body 40 is arranged in the at least two layers of insulating layers 311, and the surface of the electrode lead-out body 40 is hermetically combined with the surface of the insulating layers 311.

In some embodiments, the housing 10 may include a cylindrical lower case 11 having an opening at an upper end thereof, and an upper case 12 sealingly covering the opening at the upper end of the lower case 11. The outer diameter of the lower case 11 may be 4.5 to 40mm, preferably 6 to 30 mm. The thickness of the lower case 11 may be 0.1 to 1mm, preferably 0.13 to 0.35 mm. The upper case 12 may have a circular flat plate shape, and the outer peripheral edge thereof is sealingly combined with the opening edge of the lower case 11. Further, the upper case 12 and the lower case 11 may be made of a laser-weldable material such as stainless steel, aluminum, iron, etc., and the outer peripheral edge of the upper case 12 may be hermetically joined to the opening edge of the lower case 11 by laser welding.

An end wall 121 may be formed on the upper case 12, and the lead-out hole 120 may extend through the end wall 121 in a longitudinal direction and may be disposed coaxially with the end wall 121. In other embodiments, the end wall 121 may be formed on the lower case 11, and the central axis of the lead-out hole 120 may be offset from the central axis of the end wall 121. The first sealing portion 31 is sealingly attached to an end surface of the end wall 121 facing the battery cell 20. The first through hole 310 extends from a lateral side of the first sealing portion 31 to communicate with the second through hole 320 inward in the lateral direction. The second through-holes 320 extend in the longitudinal direction and may be perpendicular to the first through-holes 310.

The first end of the electrode lead-out body 40 may be connected to the upper end of the first electrode assembly 21 on the side away from the core hole 24. An end of the first penetration hole 310 remote from the second penetration hole 320 may extend in a lateral direction to the vicinity of a connection point of the electrode lead-out body 40 and the first electrode assembly 21. The electrode lead-out body 40 sequentially passes through the first through hole 310 and the second through hole 320 in a sealing manner and is led out to the outer sides of the shell 10 and the insulating sealing assembly 30, and the outer surface of the electrode lead-out body 40 is respectively matched with the hole walls of the first through hole 310 and the second through hole 320 in a sealing manner.

The micro battery 1 may further include a conductive connection member 50 electrically connecting the second electrode assembly 22 with the case 10. The conductive connector 50 may be attached to the bottom wall of the lower case 11 and may be welded to the lower case 11. The lower end of the second electrode assembly 22 on the side away from the core hole 24 may be welded to the conductive connection member 50.

It is to be understood that, in other embodiments, the numbers of the electrode lead-out body 40, the first sealing part 31, the second sealing part 32, and the lead-out hole 120 are not limited to one, and two or more may be applied. When there are two or more electrode lead-outs 40, the two or more electrode lead-outs 40 may be electrically connected to the first electrode assembly 21 and the second electrode assembly 22, respectively; alternatively, the two or more electrode lead-outs 40 may be electrically connected to the first electrode assembly 21 and the case 10 may be electrically connected to the second electrode assembly 22.

Fig. 4 shows a first sealing portion 31 in an alternative of the present invention, which mainly differs from the first embodiment in that, in the present embodiment, the first sealing portion 31 is formed by stacking three insulating layers 311. The three-layered insulating layer 311 includes a first-layered insulating layer 3111 at an upper portion, a second-layered insulating layer 3112 at a middle portion, and a third-layered insulating layer 3113 at a lower portion. The first insulating layer 3111 is attached to the end wall 121 in a sealed manner, a through hole 3102 through which the electrode lead-out body 40 passes is formed in the first insulating layer 3111 in a longitudinal direction, and the through hole 3102 is provided to correspond to and communicate with the second through hole 320. A receiving groove 3101 communicating with the via hole 3102 is formed by extending a lateral side of the second insulating layer 3112 inward along the lateral direction, and the receiving groove 3101 may penetrate the second insulating layer 3112 along the thickness direction. After the electrode lead 40 is placed in the receiving groove 3101, the first insulating layer 3111 and the third insulating layer 3113 are respectively attached to both sides of the second insulating layer 3112, so that the electrode lead 40 is clamped, fixed and sealed, and the receiving groove 3101 and the via hole 3102 are sealed.

Fig. 5 shows a miniature battery 1 according to a second exemplary embodiment of the present invention, which differs from the first exemplary embodiment mainly in that in the present exemplary embodiment, a first sealing portion 31 is sealingly engaged with an end face of the end wall 121 facing away from the battery cell 20. The external cross-sectional shape and dimensions of the first sealing portion 31 may be adapted to the external cross-sectional shape and dimensions of the end wall 121. Further, in the present embodiment, the electrode lead-out body 40 may be led out from the upper end of the first electrode assembly 21 on the side close to the lead-out hole 120.

Fig. 6 shows a micro-battery 1 in a third embodiment of the present invention, which is mainly different from the first embodiment in that the number of electrode lead-out bodies 40, second sealing parts 32, and lead-out holes 120 is two in this embodiment. Specifically, two electrode lead-outs 40 may be electrically connected to the first electrode assembly 21 and the second electrode assembly 22, respectively, and the two electrode lead-outs 40 may be led out from the upper ends of the first electrode assembly 21 and the second electrode assembly 22 on the sides away from the core hole 24, respectively. The first sealing portion 31 has one, and two first through holes 310 are formed in the one first sealing portion 31, through which the two electrode lead-out bodies 40 are sealingly inserted, respectively. The end wall 121 is provided with two lead-out holes 120, the two second sealing parts 32 are respectively disposed in the two lead-out holes 120, and the two electrode lead-out bodies 40 are respectively led out of the housing 10 through the two second sealing parts 32. In addition, in the present embodiment, the housing 10 may be made of a conductive material such as metal, or may be made of an insulating material such as plastic.

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 casing (10) and a cell (20) disposed within the casing (10), the cell (20) comprising first and second electrode assemblies (21, 22) of opposite polarity; the micro battery is characterized by further comprising an insulating sealing component (30) and at least one electrode lead-out body (40) which is hermetically arranged on the insulating sealing component (30) in a penetrating way, wherein each electrode lead-out body (40) is connected with the first electrode component (21) or the second electrode component (22) and is led out to the outside of the shell (10); the shell (10) comprises an end wall (121), the insulating and sealing assembly (30) comprises at least one first sealing part (31) attached to the end wall (121), and at least one first through hole (310) for the at least one electrode lead-out body (40) to penetrate through is formed in the at least one first sealing part (31).

2. The micro-battery according to claim 1, wherein the first sealing portion (31) is formed by stacking at least two insulating layers (311).

3. The micro battery according to claim 2, wherein the insulating layer (311) is in a sheet shape, and the thickness of each insulating layer (311) is 0.02-1 mm.

4. The micro battery according to claim 2, wherein the at least two insulating layers (311) are made of the same or different materials.

5. The micro battery according to claim 2, wherein the insulating layer (311) is made of at least one of plastic, rubber, TPE, ceramic, and glass.

6. The micro-battery according to claim 2, characterized in that the insulating layer (311) of the at least two insulating layers (311) in contact with the end wall (121) and/or the electrode lead-out body (40) is made of a soft insulating material.

7. The micro-battery according to claim 1, wherein the end wall (121) is provided with at least one lead-out hole (120), the insulating and sealing assembly (30) further comprises at least one second sealing portion (32) disposed through the at least one lead-out hole (120), and the at least one second sealing portion (32) is formed with at least one second through hole (320) for the at least one electrode lead-out body (40) to pass through.

8. The micro-battery according to claim 7, wherein the at least one second sealing part (32) is integrated with the at least one first sealing part (31), or wherein the at least one second sealing part (32) is provided separately from the at least one first sealing part (31).

9. The micro-battery according to any of claims 1-8, wherein the end wall (121) is electrically conductive, the first electrode assembly (21) is electrically connected to the at least one electrode lead (40), and the second electrode assembly (22) is electrically connected to the end wall (121).

10. The micro battery according to any one of claims 1 to 8, comprising at least two of the electrode lead-outs (40), the at least two electrode lead-outs (40) being electrically connected to the first electrode assembly (21) and the second electrode assembly (22), respectively.