CN220086192U

CN220086192U - Micro battery

Info

Publication number: CN220086192U
Application number: CN202320066232.1U
Authority: CN
Inventors: 杨京松; 黄凯; 杨刚刚; 聂宁
Original assignee: Zhuhai Juneng New Energy Co ltd
Current assignee: Zhuhai Juneng New Energy Co ltd
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-11-24
Anticipated expiration: 2033-01-06

Abstract

The utility model discloses a miniature battery, which comprises a battery shell and a battery core arranged in the battery shell, wherein the battery core comprises a first electrode assembly and a second electrode assembly which are opposite in polarity; the inner wall surface of the battery shell is provided with a plurality of holes for storing electrolyte, so that the electrolyte retention amount can be increased and the cycle performance of the micro battery is improved while the micro battery is ensured to be compact in structure.

Description

Micro battery

Technical Field

The utility model relates to the technical field of batteries, in particular to an improved miniature battery.

Background

As shown in fig. 1, a typical miniature cell includes a metal housing, which is typically of a smooth surface configuration, and a battery cell disposed within the metal housing. At present, on the premise that the miniature battery pursues high energy density, the internal fillers are more and more, so that the space of electrolyte is occupied, and the comprehensive performance of the battery is affected.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide an improved miniature battery.

The technical scheme adopted for solving the technical problems is as follows: constructing a miniature battery, comprising a battery shell and an electric core arranged in the battery shell, wherein the electric core comprises a first electrode assembly and a second electrode assembly which are opposite in polarity;

the inner wall surface of the battery shell is provided with a plurality of holes for storing electrolyte.

In some embodiments, the inner wall surface of the battery case is provided with a pore layer, and the pores are arranged on the pore layer.

In some embodiments, the pore layer has a thickness of 0.01 to 0.1mm and a roughness Ra of 0.05 to 12.5 μm.

In some embodiments, the pore layer has a thickness of 0.05mm and a roughness Ra of 5 μm.

In some embodiments, the battery case includes a case having an opening, and a sealing cover provided at the opening of the case;

the inner wall surface of the housing is provided with the pore layer formed by electrochemical corrosion or acid corrosion.

In some embodiments, the sealing cover comprises an end wall, a spacer and a conductive sheet which are sequentially stacked, wherein the end wall and the conductive sheet are mutually and insulatively combined through the spacer;

the battery core is provided with a hollow cavity, the miniature battery further comprises an electrode leading-out body penetrating through the hollow cavity, one end of the electrode leading-out body is connected with the conducting plate, and the other end of the electrode leading-out body is connected with the first tab of the first electrode assembly.

In some embodiments, the first tab and the sealing cover are disposed at two axial ends of the battery cell.

In some embodiments, the end wall may be electrically conductive, and the second electrode assembly is electrically connected to the end wall.

In some embodiments, the housing may be electrically conductive, and the second electrode assembly is electrically connected to the housing.

In some embodiments, the inner wall surface of the battery case is provided with an insulating member.

The implementation of the utility model has the following beneficial effects: the miniature battery comprises a battery shell and a battery core arranged in the battery shell, wherein the battery core comprises a first electrode assembly and a second electrode assembly which are opposite in polarity; the inner wall surface of the battery shell is provided with a plurality of holes for storing electrolyte, so that the electrolyte retention amount can be increased and the cycle performance of the micro battery is improved while the micro battery is ensured to be compact in structure.

Drawings

In order to more clearly illustrate the technical solution of the present utility model, the following description will be given with reference to the accompanying drawings and examples, it being understood that the following drawings only illustrate some examples of the present utility model and should not be construed as limiting the scope, and that other related drawings can be obtained from these drawings by those skilled in the art without the inventive effort. In the accompanying drawings:

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

fig. 2 is a schematic structural view of a microbattery in some embodiments of the present utility model.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present utility model.

It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or one or more intervening elements may also be present. The terms "first," "second," "third," and the like are used merely for convenience in describing the present utility model and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," "third," etc. may explicitly or implicitly include one or more such features. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present utility model. It will be apparent, however, to one skilled in the art that the present utility model may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present utility model with unnecessary detail.

Referring to fig. 2, the present utility model shows a micro battery, which may be a button-type lithium ion battery, and may be in a shape of a flat cylinder, a square cylinder, an oval cylinder, or other shapes.

Preferably, the micro battery includes a battery case 10, and a battery cell 20 disposed within the battery case 10, the battery cell 20 including a first electrode assembly 21 and a second electrode assembly 22 having opposite polarities; a sealed accommodating space is formed in the battery case 10, and the battery cell 20 is disposed in the accommodating space and can be coaxially disposed with the battery case 10.

Further, the inner wall surface of the battery case 10 is provided with a plurality of holes for storing electrolyte, so that the electrolyte retention amount can be increased and the cycle performance of the micro battery can be improved while ensuring the compact structure of the micro battery.

Preferably, the inner wall surface of the battery case 10 is provided with a pore layer 111, and the pore layer 111 is provided with a plurality of pores. In some embodiments, the pore layer 111 may also be defined as an etching layer, which may be formed by subjecting the inner wall surface of the battery case 10 to electrochemical etching or acid etching treatment.

Preferably, the thickness of the porous layer 111 is 0.01 to 0.1mm, and the roughness Ra is 0.05 to 12.5 μm. More preferably, the thickness of the pore layer 111 is 0.05mm and the roughness Ra is 5 μm. Of course, in other embodiments, the thickness and roughness of the pore layer 111 may be other specifications, which are not specifically limited herein.

Preferably, the battery case 10 includes a case 11 having an opening, and a sealing cover 12 provided at the opening of the case 11. Specifically, the battery case 10 may include a cylindrical case 11 having an opening at an upper end thereof, and a sealing cap 12 sealingly covering the opening at the upper end of the case 11.

The inner wall surface of the case 11 is provided with the pore layer 111 formed by electrochemical corrosion or acid corrosion.

In some embodiments, the sealing cap 12 includes an end wall 121, a spacer 122 and a conductive sheet 123 stacked in sequence, the end wall 121 and the conductive sheet 123 are combined with each other in an insulating manner by the spacer 122, the battery cell 20 has a hollow cavity, the micro battery further includes an electrode lead-out body 124 penetrating the hollow cavity, one end of the electrode lead-out body 124 is connected to the conductive sheet 123, and the other end of the electrode lead-out body 124 is connected to the first tab 211 of the first electrode assembly 21. Preferably, the first tab 211 and the sealing cover 12 are disposed at two axial ends of the battery cell 20.

The sealing cover 12 may include an end wall 121, a spacer 122, and a conductive sheet 123 that are stacked in this order from bottom to top. The end wall 121 may have a circular flat plate shape, and an outer circumference thereof is sealingly coupled with an opening edge of the lower case 11. In some embodiments, the end walls 121, the lower shell 11 may be made of a metallic conductive material, such as a laser-weldable material of stainless steel, aluminum, iron, or the like. The periphery of the end wall 121 may be sealingly joined to the open edge of the lower shell 11 by means of laser welding.

Preferably, the spacer 122 is disposed between the end wall 121 and the conductive sheet 123 to insulate the end wall 121 and the conductive sheet 123 from each other. The end wall 121 and the spacer 122 may have a lead hole for the electrode lead 124 to pass through. The extraction holes may be formed in the middle of the end wall 121 and the spacer 122, and the central axes of the end wall 121, the spacer 122, the conductive sheet 123, and the extraction holes may coincide with the central axis of the housing 11. The thickness of the end wall 121, the spacer 122 and the conductive sheet 123 may be between 0.02mm and 1mm, respectively, preferably between 0.1mm and 0.25mm. In some embodiments, the conductive sheet 123 is a disc-shaped metal sheet, the spacer 122 is a disc-shaped plastic sheet, preferably a laser-meltable plastic sheet, and the end wall 121, the spacer 122, and the conductive sheet 123 are bonded together by laser welding.

In other embodiments, the spacer 122 and the conductive sheet 123 are not limited to be disc-shaped, and may be square sheet-shaped, oval sheet-shaped, or the like. The surfaces of the end wall 121, the conductive sheet 123 and the spacer 122 to be bonded may be formed with a plurality of grooves by surface treatment in advance, and a portion of the spacer 122 is heat-fused into the plurality of grooves after laser welding, thereby making the bonding tighter. In other embodiments, the end wall 121, the spacer 122, and the conductive sheet 123 may be bonded together by ultrasonic welding, nano-injection molding, or glue bonding. In other embodiments, the spacer 122 may be made of rubber, TPE or other insulating materials.

In some embodiments, the end wall 121 may have a cylindrical structure, and a circumferential wall surface thereof is welded to an inner wall surface of the housing 11. Alternatively, the inner wall surface of the housing 11 is provided with a step near the opening thereof so that the circumferential wall surfaces of the end walls 121 abut and are welded and sealed together.

Preferably, the electrode lead 124 may have a cylindrical structure, such as a cylindrical structure, or a square cylindrical structure, although in other embodiments, the electrode lead 124 may have a sheet-like structure.

In some embodiments, the battery cell 20 may include a first electrode assembly 21, a second electrode assembly 22, and an isolation assembly disposed between the first electrode assembly 21 and the second electrode assembly 22 to isolate the first electrode assembly 21 from the second electrode assembly 22 in an insulating manner. 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.

Preferably, the first electrode assembly 21 and the second electrode assembly 22 respectively comprise at least one conductive metal sheet, the isolation assembly comprises at least one insulating isolation sheet, and the first electrode assembly 21, the isolation assembly and the second electrode assembly 22 are stacked in sequence and then wound to form the battery cell 20.

Further, the end wall 121 may be electrically conductive, and the second electrode assembly 22 is electrically connected to the end wall 121.

Further, the case 11 may be electrically conductive, and the second electrode assembly 22 is electrically connected to the case 11. Preferably, the second electrode assembly 22 may be electrically connected to and conducted with the end wall 121 or the case 11, such as the aperture layer 111, through the second electrode tab 221.

Preferably, the second tab 221 may further include a current collector and a conductive member, wherein the current collector is connected to the second electrode assembly 22, such as by welding, and then connected to the conductive member, and the conductive member is electrically connected to and electrically connected to the end wall 121 or the case 11, such as the aperture layer 111.

Preferably, the inner wall surface of the battery case 10 is provided with an insulator 13 to separate the first tab 211 from the inner wall surface of the case 11. Preferably, an insulating member 13 is provided on the inner bottom wall surface of the battery case 10, and the insulating member 13 may be an insulating sheet or an insulating film such as a plastic film or a silicone film.

It is to be understood that the above examples only represent preferred embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the utility model; 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 miniature battery comprising a battery case (10), and a battery cell (20) disposed within the battery case (10), the battery cell (20) comprising a first electrode assembly (21) and a second electrode assembly (22) of opposite polarity;

the inner wall surface of the battery case (10) is provided with a plurality of holes for storing electrolyte.

2. The miniature battery according to claim 1, characterized in that the inner wall surface of the battery case (10) is provided with a pore layer (111), and the pore layer (111) is provided with the plurality of pores.

3. The microbattery of claim 2, characterized in that the thickness of the pore layer (111) is 0.01-0.1 mm, and the roughness Ra is 0.05-12.5 μm.

4. A microbattery according to claim 3, characterized in that the thickness of the pore layer (111) is 0.05mm and the roughness Ra is 5 μm.

5. The miniature battery according to any one of claims 2 to 4, characterized in that the battery case (10) comprises a housing (11) having an opening, and a sealing cover (12) is provided at the opening of the housing (11);

the inner wall surface of the housing (11) is provided with the pore layer (111) formed by electrochemical corrosion or acid corrosion.

6. The microbattery of claim 5, characterized in that said sealing cap (12) comprises an end wall (121), a spacer (122) and a conductive sheet (123) stacked in sequence, said end wall (121) and said conductive sheet (123) being mutually insulated by said spacer (122);

the battery cell (20) is provided with a hollow cavity, the miniature battery further comprises an electrode lead-out body (124) penetrating through the hollow cavity, one end of the electrode lead-out body (124) is connected with the conducting plate (123), and the other end of the electrode lead-out body (124) is connected with a first tab (211) of the first electrode assembly (21).

7. The miniature battery according to claim 6, wherein the first tab (211) and the sealing cap (12) are disposed at two axial ends of the electrical core (20).

8. The microbattery of claim 6 wherein said end wall (121) is electrically conductive and said second electrode assembly (22) is electrically connected to said end wall (121).

9. The microbattery of claim 6, characterized in that said housing (11) is electrically conductive, said second electrode assembly (22) being electrically connected to said housing (11).

10. The miniature battery according to claim 1, characterized in that the inner wall surface of the battery case (10) is provided with an insulating member (13).