CN218482320U

CN218482320U - Micro battery

Info

Publication number: CN218482320U
Application number: CN202221641319.9U
Authority: CN
Inventors: 徐昌书; 黄凯; 杨京松
Original assignee: Zhuhai Micromatrix Industry Co ltd
Current assignee: Zhuhai Juneng New Energy Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2023-02-14
Anticipated expiration: 2032-06-28

Abstract

The utility model discloses a micro battery, which comprises a shell and an electric core arranged in the shell, wherein the electric core comprises a first electrode component and a second electrode component with opposite polarities; the shell comprises a first shell and a second shell, the first shell is inserted into an inner cavity of the second shell and is sealed and fixed with the second shell, the first shell and the second shell are provided with an overlapping area, a first electrode assembly is led out of the first electrode assembly, one end of the first electrode lug is mechanically and electrically connected to the inner wall of the overlapping area of the first shell, the micro battery is in the preparation process, the welding spot of the first electrode lug is located inside the shell, even if the first shell is melted through, the second shell can still play a role in protection, the risk of electrolyte leakage is avoided, the yield can be greatly improved, and the production cost is reduced.

Description

Micro battery

Technical Field

The utility model relates to a battery technology field especially relates to a miniature battery.

Background

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

Referring to fig. 1, a micro battery 4 in the related art includes a metal casing 41 and a battery cell 42 disposed in the metal casing 41, wherein a tab 43 of the battery cell 42 is directly welded on a wall surface (a welding area 44 shown in the figure) of the metal casing 41, but during a manufacturing process, many factors including but not limited to current, surface cleaning, etc. may cause the metal casing 41 to melt through, thereby causing liquid leakage, reducing a yield, and further increasing a production cost.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a modified miniature battery.

The utility model provides a technical scheme that its technical problem adopted is: constructing a miniature battery including a housing and a cell disposed within the housing, the cell including first and second electrode assemblies of opposite polarity; the shell comprises a first shell and a second shell, the first shell is inserted into an inner cavity of the second shell and is fixed with the second shell in a sealing mode, and the first shell and the second shell are provided with an overlapping area;

a first electrode tab is led out of the first electrode assembly, and one end of the first electrode tab is mechanically and electrically connected to the inner wall of the first shell, which is located in the overlapping area.

In some embodiments, the one end of the first tab is welded and fixed to an inner wall of the first housing in the overlapping region.

In some embodiments, a portion of the first case located at the overlapping region may be electrically conductive, and the first electrode assembly may be electrically connected to the first case through the first tab.

In some embodiments, the first tab includes a current collector, and one end of the current collector is fixed to the inner wall of the first casing in the overlapping region;

or, first utmost point ear includes the mass flow body and electrically conductive connecting piece, electrically conductive connecting piece is at least partly located first casing is located on the inner wall of overlap region, the one end of the mass flow body is fixed in electrically conductive connecting piece is last.

In some embodiments, the overlapping area of the first housing and the second housing is 5% -99% of the height dimension of the enclosure.

In some embodiments, the first housing and the second housing are both cylindrical structures, and the outer diameter of the first housing is smaller than or equal to the inner diameter of the second housing;

the first shell comprises an end wall and an annular peripheral wall extending from the periphery of the end wall; the second shell comprises a bottom wall and an annular surrounding wall extending from the periphery of the bottom wall;

the outer wall surface of the annular peripheral wall and the inner wall surface of the annular surrounding wall are at least partially overlapped together to form the overlapping area.

In some embodiments, the battery cell comprises a separation assembly, the battery cell is formed by winding the first electrode assembly and the second electrode assembly and the separation assembly, and a cavity is formed in the center of the battery cell;

and a second tab is led out of the second electrode assembly.

In some embodiments, the first housing further comprises a spacer and a conductive sheet, and the end wall and the conductive sheet are in insulation sealing combination with each other through the spacer;

the conductive tab extends with a first electrode lead through the cavity to connect with the second pole ear.

In some embodiments, the housing further includes an insulator provided between an outer wall surface of the annular peripheral wall and an inner wall surface of the annular peripheral wall;

the bottom wall is electrically conductive and extends with a second electrode lead through the cavity for connection with the second electrode tab.

In some embodiments, the second electrode extractor and the second housing are of a unitary structure.

Implement the utility model discloses following beneficial effect has: the utility model discloses a micro battery, which comprises a shell and an electric core arranged in the shell, wherein the electric core comprises a first electrode component and a second electrode component with opposite polarities; the shell comprises a first shell and a second shell, the first shell is inserted into an inner cavity of the second shell and is sealed and fixed with the second shell, the first shell and the second shell are provided with an overlapping area, a first electrode assembly is led out of the first electrode assembly, one end of the first electrode lug is mechanically and electrically connected to the inner wall of the overlapping area of the first shell, the micro battery is in the preparation process, the welding spot of the first electrode lug is located inside the shell, even if the first shell is melted through, the second shell can still play a role in protection, the risk of electrolyte leakage is avoided, the yield can be greatly improved, and the production cost is reduced.

Drawings

In order to explain the technical solution of the present invention more clearly, the present invention will be further described with reference to the accompanying drawings and examples, it should be understood that the following drawings only show some examples of the present invention, and therefore should not be considered as limiting the scope, for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort. In the drawings:

fig. 1 is a simple schematic diagram of a micro battery in the related art;

fig. 2 is a schematic structural view of a micro battery according to some embodiments of the present invention;

FIG. 3 is a schematic diagram of the front side structure of the micro battery shown in FIG. 2;

FIG. 4 isbase:Sub>A cross-sectional view of the micro-battery of FIG. 3 taken along line A-A;

FIG. 5 is a schematic diagram of a portion of the micro-battery of FIG. 4 in greater detail;

fig. 6 is a schematic structural view of a micro battery according to another embodiment of the present invention;

fig. 7 is a schematic structural diagram of a micro battery according to another 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. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "upper", "lower", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", and the like are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, and are only for convenience of description of the present technical solution, and do not indicate that the device or element referred to must have a specific direction, and thus, should not be construed as limiting the present invention.

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 merely for convenience in describing the present technical solution and are not to be construed as indicating or implying any 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 2 to 4, a micro battery according to some embodiments of the present invention includes a housing 1 and a battery cell 2 disposed in the housing 1, the battery cell 2 includes a first electrode assembly 21 and a second electrode assembly 22 with opposite polarities, wherein the housing 1 includes a first casing 11 and a second casing 12, the first casing 11 is inserted into an inner cavity of the second casing 12 and is sealed and fixed with the second casing 12, the first casing 11 and the second casing 12 have an overlapping region, a first tab is led out from the first electrode assembly 21, and one end of the first tab is mechanically and electrically connected to an inner wall of the first casing 11 located in the overlapping region.

Understandably, in the preparation process of the micro battery, the welding spot of the first tab is positioned inside the shell, even if the first shell 11 is melted through, the second shell 12 still can play a role in protection, the risk of electrolyte leakage cannot be caused, the yield can be greatly improved, and the production cost can be reduced.

In some embodiments, the micro battery may be a lithium ion button cell, which may be substantially in the shape of an oblate cylinder. In some embodiments, the height of the micro battery may be 0.1 to 0.9 times, e.g., 0.25 to 0.7 times, preferably, 0.5 times its outer diameter. Of course, in other embodiments, the micro battery may have other shapes such as a square column shape, an oval column shape, and the like.

In some embodiments, a closed accommodating space is formed in the housing 1, and the battery cell 2 is disposed in the accommodating space and may be disposed coaxially with the housing 1.

In some embodiments, the first housing 11 and the second housing 12 are both cylindrical structures having an opening, such as circular cylindrical structures, and the outer diameter of the first housing 11 is smaller than or equal to the inner diameter of the second housing 12, so that the first housing 11 is inserted into the second housing 12. The first housing 11 and the second housing 12 may be fixed together by laser welding or extrusion sealing, wherein when laser welding is adopted, the welding position may be the position a shown in fig. 3.

Further, the first housing 11 includes an end wall 111 and an annular peripheral wall 112 extending from a periphery of the end wall 111; the end wall 111 may be a circular flat plate, or an arch 1111 is disposed at a connection portion of the end wall 111 and the annular peripheral wall 112. In some embodiments, the end wall 111 and the annular peripheral wall 112 are electrically conductive and may be made of a metal conductive material, such as stainless steel, aluminum, iron, or other laser weldable material.

The second housing 12 may include a bottom wall 121 and an annular surrounding wall 122 extending from the periphery of the bottom wall 121, and the outer wall surface of the annular surrounding wall 112 and the inner wall surface of the annular surrounding wall 122 at least partially overlap to form an overlapping region. Since the first housing 11 is inserted into the second housing 12, the area enclosed by the portion of the annular peripheral wall 112 located inside the second housing 12 is an overlapping area, and it can be understood that the annular peripheral wall 112 can be partially or completely disposed inside the second housing 12. In some embodiments, the second housing 12 can be conductive, for example, it can be made of a metal conductive material, such as stainless steel, aluminum, iron, etc., which can be welded by laser, wherein the material of the second housing 12 can be the same as or different from that of the first housing 11.

Preferably, the overlapping area of the first housing 11 and the second housing 12 is 5% -99% of the height dimension of the housing 1, and may be 20% -80%, for example.

In some embodiments, a step 1221 is disposed on the inner periphery of the annular surrounding wall 122, the bottom end of the annular surrounding wall 112 abuts against the upper surface of the step 1221, and the inner wall surface of the annular surrounding wall 112 may be flush with the inner wall surface of the annular surrounding wall 122, so that the overall structure of the housing 1 is neat, and the battery installation space required by the electronic device is reduced when the micro battery is assembled and used subsequently.

In some embodiments, one end of the first tab is welded and fixed to the inner wall of the first housing 11 in the overlapping area. Preferably, the portion of the first case 11 in the overlapping region may conduct electricity, and the first electrode assembly 21 is electrically connected to the first case 11 through a first tab.

As shown in fig. 4 to 5, in some embodiments, the first tab may include a current collector 211 and a conductive connector 212, the conductive connector 212 is at least partially disposed on an inner wall of the first housing 11 in the overlapping region, and one end of the current collector 211 is fixed to the conductive connector 212. The conductive connecting member 212 may be fixed on the inner wall surface of the annular peripheral wall 122 by laser welding, and the welding position of the conductive connecting member 212 may be a b position, and the current collector 211 may be fixed on the wall surface of the conductive connecting member 212 on the side away from the annular peripheral wall 122 by laser welding, and the welding position of the current collector may be a c position, so that the first electrode assembly 21 is electrically connected to the first case 11. Preferably, the welding position of the first shell 11 and the second shell 12 is offset from the welding position of the first tab. In this embodiment, the a position may be in the upper region of the b position, and the c position may be in the lower region of the b position.

In other embodiments, as shown in fig. 6, the first tab includes a current collector 211, one end of the current collector 211 is fixed to the inner wall of the first casing 11 in the overlapping area, the current collector 211 may be fixed to the inner wall of the annular peripheral wall 112 in the overlapping area by laser welding, and the welding position may be the d position. It is understood that the structure and the welding fixing position of the first tab can be appropriately adjusted according to the requirements, and are not particularly limited herein.

In some embodiments, the first housing 11 further includes a spacer 113 and a conductive sheet 114, and the end wall 111 and the conductive sheet 114 are insulated and hermetically bonded to each other through the spacer 113.

The spacer 113 is disposed between the end wall 111 and the conductive sheet 114 to insulate and isolate the end wall 111 and the conductive sheet 114 from each other. The thickness of the end wall 111, the spacer 113 and the conductive sheet 114 may be between 0.02mm and 1mm, respectively, preferably between 0.1mm and 0.25mm.

In some embodiments, the conductive sheet 114 is a circular metal sheet, the spacer 113 is a circular plastic sheet, preferably a laser-fusible plastic sheet, and the end wall 111, the spacer 113 and the conductive sheet 114 are bonded together by laser welding. In other embodiments, the

conductive sheets

114, 114 are not limited to be in the shape of a circular sheet, and may be in other shapes such as a square sheet, an oval sheet, and the like. The surface of the end wall 111, the conductive sheet 114 and the spacer 113 may be previously surface-treated to form a plurality of grooves, and after laser welding, a portion of the spacer 113 is thermally fused into the plurality of grooves, thereby making the bonding more tight. In other embodiments, the end wall 111, the spacer 113, and the conductive sheet 114 may be bonded together by ultrasonic welding, nano-molding, or gluing. In other embodiments, the spacers 113 may be made of rubber, TPE, or other insulating materials.

In some embodiments, the battery cell 2 may further include a separation assembly, the battery cell 2 is formed by winding a first electrode assembly 21 and a second electrode assembly 22, and the separation assembly, 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.

In some embodiments, the battery cell 20 may have a cylindrical shape, a cavity is formed in the cylindrical shape along a longitudinal direction, the second electrode assembly 22 has a second electrode tab 221 led out, and the conductive sheet 114 extends to have an electrode lead-out body 115 penetrating through the cavity to connect with the second electrode tab 221. Preferably, a second tab 221 is extended from the lower end of the second electrode assembly 22 away from the end wall 111, a first electrode extension 115 is extended downward from the middle of the conductive sheet 114 and penetrates through the cavity to connect with the second tab 221, and the conductive sheet 114 and the second tab 221 may be respectively located at two sides of the cavity. Preferably, the side of the bottom wall 121 facing the second tab 221 is provided with an insulating layer 3 to prevent the second tab 221 from being connected to the second casing 12.

Preferably, the end wall 111 and the spacer 113 may further have a hole formed thereon for passing the first electrode lead-out body 115, and the hole may be in communication with the cavity and may coincide with the central axis of the cavity. The outlet hole may be formed in the middle of the end wall 111 and the spacer 113, and the central axes of the end wall 111, the spacer 113, the conductive sheet 114, and the outlet hole may coincide with the central axis of the second housing 12.

In some embodiments, the battery cell 2 may be made in the form of a spiral winding. Preferably, the first electrode assembly 21 and the second electrode assembly 22 respectively include at least one conductive metal sheet, the isolation assembly includes at least one insulating isolation sheet, and after the first electrode assembly 21, the isolation assembly, and the second electrode assembly 22 are sequentially stacked and wound around a circular rod-shaped winding core, the winding core is drawn out, so as to form a cavity with a central axis coinciding with the central axis of the battery cell 2. Of course, the battery cell 2 may be a winding body, or may be a laminated structure.

In some embodiments, the conductive sheet 114 and the first electrode lead-out body 115 may be an integral structure, and the cross section thereof is substantially a T-shaped structure, in this embodiment, the first electrode lead-out body 115 and the conductive sheet 114 as a component of the first housing 11 are integrally formed, and may be processed by casting, forging, cutting or laser to form an integral structure, and the conductive sheet 114 and the first electrode lead-out body 115 are an integral structure, so that the processing procedures of the first electrode lead-out body 115 and the first housing 11 in the related art are reduced, the production efficiency can be improved, the production cost can be effectively reduced, and meanwhile, the integral structure is beneficial to miniaturization of the button cell.

In some embodiments, the first electrode lead 115 is connected to the second electrode assembly 22 and the conductive sheet 114, respectively, and may include a first electrode portion connected to the conductive sheet 114 and a second electrode portion connected to the second electrode assembly 22. The first electrode part is in a rigid column shape, and the column structure is beneficial to reducing the size of the first electrode part and the size of a leading-out hole for the first electrode part to pass through, so that the connection operation of the first electrode part and the conducting strip 114 is facilitated.

The rigid first electrode portion and the end wall 111 are fixed by welding or the like, and then function to fix the cell 2. The upper end of the first electrode part 2 passes through the lead-out hole and is connected to the conductive sheet 114, and a space is formed between the outer peripheral surface of the first electrode part and the hole wall of the lead-out hole to ensure that the first electrode part passes through the end wall 111 in an insulated manner. In some embodiments, the cross-sectional shape of the first electrode portion corresponds to the cross-sectional shape of the lead-out hole, and the cross-sectional dimension of the first electrode portion is smaller than the cross-sectional dimension of the lead-out hole, facilitating further downsizing of the first electrode portion and the lead-out hole.

In this embodiment, the lead-out hole is a circular hole, the first electrode portion is cylindrical, and the outer diameter of the first electrode portion is smaller than the diameter of the lead-out hole. In some embodiments, the outer diameter of the first electrode portion may be 0.8-3mm. In other embodiments, the cross section of the lead-out hole may also be in other regular or irregular shapes such as an ellipse and a square, and correspondingly, the cross section of the first electrode portion may also be in other regular or irregular shapes such as an ellipse and a square. In other embodiments, the cross-sectional shape of the first electrode portion may not correspond to the cross-sectional shape of the lead-out hole, for example, the cross-sectional shape of the lead-out hole is square, and the cross-sectional shape of the first electrode portion is circular.

The second electrode portion may be integrally formed with second electrode assembly 22, in which case the second electrode portion and second electrode assembly 22 are both rigid. Or, the second electrode portion 312 and the second electrode assembly 22 may also be formed separately and then combined together by welding, and at this time, the second electrode portion may also be flexible, so as to be conveniently led out from the electric core 2, and avoid damage to the electric core 2 due to collision and other reasons.

In other embodiments, the second electrode portion may be in the shape of a sheet, which facilitates connection with the second tab 221. Further, a central axis of the second electrode portion may coincide with a central axis of the first electrode portion, and a thickness of the second electrode portion may be smaller than an outer diameter of the first electrode portion.

As shown in fig. 7, in other embodiments, the housing 1 further includes an insulating member 13 disposed between an outer wall surface of the annular peripheral wall 112 and an inner wall surface of the annular surrounding wall 122, the insulating member 13 may be a soft rubber material such as a silicone rubber material, the insulating member 13 covers the overlapping area, the insulating member 13 may be bonded to the outer wall surface of the first housing 11 by an adhesive such as glue or fusion welding, further, a lower end of the insulating member 13 may wrap an end portion of the annular peripheral wall 112 facing the bottom wall 121 to achieve an insulating arrangement between the first housing 11 and the second housing 12, and an open end of the second housing 12 may be mechanically pressed to seal the second housing 12 with the first housing 11 through the insulating member 13.

Further, the bottom wall 121 is electrically conductive, and the bottom wall 121 extends with a second electrode lead-out 123 extending through the cavity to connect with the second pole ear 221. Preferably, a second tab 221 is extended from a side of the second electrode assembly 22 away from the bottom wall 121, a second electrode lead-out body 115 is extended upward from the middle of the bottom wall 121 and penetrates through the cavity to be connected with the second tab 221, a welding area is formed at the joint of the second electrode lead-out body 115 and the second tab 221, the second electrode lead-out body 115 and the second tab 221 can be connected together by laser welding, and therefore, the structural welding position of the micro battery is located inside the case 1.

Further, the surface of the end wall 111 facing the second tab 221 is provided with an insulating layer 3 to insulate the second tab 221 from the first case 11. Preferably, the second electrode lead-out body 123 may be an integral structure with the second case 12.

The first housing 11 and the second housing 12 are both conductive, the first housing 11 can form a positive polarity structure, and the second housing 12 can form a negative polarity structure, or the first housing 11 can form a negative polarity structure, and the second housing 12 can form a positive polarity structure.

It should be understood that the above examples only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but should not be 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 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 micro battery comprises a shell (1) and a battery cell (2) arranged in the shell (1), wherein the battery cell (2) comprises a first electrode assembly (21) and a second electrode assembly (22) with opposite polarities; the shell (1) is characterized by comprising a first shell (11) and a second shell (12), wherein the first shell (11) is inserted into an inner cavity of the second shell (12) and is fixed with the second shell (12) in a sealing manner, and the first shell (11) and the second shell (12) have an overlapping area;

a first electrode tab is led out of the first electrode assembly (21), and one end of the first electrode tab is mechanically and electrically connected to the inner wall of the first shell (11) in the overlapping area.

2. The micro-battery according to claim 1, wherein the one end of the first tab is welded and fixed to an inner wall of the first case (11) at the overlapping region.

3. The micro battery according to claim 2, wherein a portion of the first case (11) in the overlapping region is electrically conductive, and the first electrode assembly (21) is electrically connected to the first case (11) through the first tab.

4. The micro-battery according to claim 1, wherein the first tab comprises a current collector (211), one end of the current collector (211) being fixed to the inner wall of the first case (11) in the overlapping area;

or, first utmost point ear includes the mass flow body (211) and electrically conducts connecting piece (212), electrically conducts connecting piece (212) and locates at least partly first casing (11) is located on the inner wall of overlap region, the one end of mass flow body (211) is fixed in electrically conduct connecting piece (212) is last.

5. The micro-battery according to claim 1, characterized in that the overlapping area of the first case (11) and the second case (12) is 5% -99% of the height dimension of the housing (1).

6. The micro battery according to any one of claims 1 to 5, wherein the first case (11) and the second case (12) are both cylindrical structures, and the outer diameter of the first case (11) is smaller than or equal to the inner diameter of the second case (12);

the first shell (11) comprises an end wall (111) and an annular peripheral wall (112) extending from the periphery of the end wall (111); the second shell (12) comprises a bottom wall (121) and an annular surrounding wall (122) extending from the periphery of the bottom wall (121);

the outer wall surface of the annular peripheral wall (112) and the inner wall surface of the annular surrounding wall (122) are at least partially overlapped together to form the overlapping region.

7. The miniature battery according to claim 6, wherein said cell (2) comprises a separation assembly, said cell (2) is formed by said first electrode assembly (21) and said second electrode assembly (22) and said separation assembly by winding, and a cavity is arranged in the center of said cell (2);

a second tab (221) is led out of the second electrode assembly (22).

8. The micro battery according to claim 7, wherein the first case (11) further comprises a spacer (113) and a conductive sheet (114), and the end wall (111) and the conductive sheet (114) are hermetically sealed and bonded to each other through the spacer (113);

the conductive strip (114) extends with a first electrode lead (115) through the cavity for connection with the second pole ear (221).

9. The micro-battery according to claim 7, wherein the case (1) further comprises an insulating member (13) provided between an outer wall surface of the annular peripheral wall (112) and an inner wall surface of the annular peripheral wall (122);

the bottom wall (121) is electrically conductive, and the bottom wall (121) extends with a second electrode lead (123) passing through the cavity to connect with the second pole ear (221).

10. The micro-battery of claim 9, wherein the second electrode lead (123) is of unitary construction with the second housing (12).