CN113471513A - Miniature lithium battery and preparation method thereof - Google Patents

Miniature lithium battery and preparation method thereof Download PDF

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Publication number
CN113471513A
CN113471513A CN202110909815.1A CN202110909815A CN113471513A CN 113471513 A CN113471513 A CN 113471513A CN 202110909815 A CN202110909815 A CN 202110909815A CN 113471513 A CN113471513 A CN 113471513A
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China
Prior art keywords
cover plate
conductor
battery
electrode assembly
shell
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CN202110909815.1A
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Chinese (zh)
Inventor
廖建华
邬永缜
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Dongguan Lidea Electronics Co ltd
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Dongguan Lidea Electronics Co ltd
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Priority to CN202110909815.1A priority Critical patent/CN113471513A/en
Publication of CN113471513A publication Critical patent/CN113471513A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/153—Lids or covers characterised by their shape for button or coin cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention provides a miniature lithium battery and a preparation method thereof, and relates to the technical field of battery structures. It includes a shell body with bottom surface and side wall which is extended around the edge of bottom surface; the edge of the upper end of the shell is connected with a cover plate in a sealing way, and the cover plate and the shell form a hollow containing cavity; the cover plate is provided with a guide hole, the guide hole is sealed through an I-shaped connecting piece, and a sealing insulating piece is arranged between the connecting piece and the shell; an electrode assembly and electrolyte are arranged inside the accommodating cavity; one side of the electrode assembly is connected to the case or the cap plate through a conductor, and the other side of the electrode assembly is connected to the connector through a conductor. The cover plate of the miniature lithium battery is hermetically welded with the edge of the upper end of the shell, so that the volume of a battery containing cavity can be increased; through being equipped with the guide hole on the apron, adopt connecting piece sealing insulation to connect, integrate two traditional electrode surfaces in an electrode surface and use, need not accessories such as battery button, battery holder when this battery uses, improved the space utilization of consumer, reduced consumer manufacturing cost.

Description

Miniature lithium battery and preparation method thereof
Technical Field
The invention belongs to the technical field of battery structures, and particularly relates to a miniature lithium battery and a preparation method thereof.
Background
Rechargeable micro lithium ion batteries are widely used in portable electronic devices such as mobile phones and bluetooth headsets. In smaller, more sophisticated devices, battery volumetric energy density is a critical consideration, such as in hearing aids, wireless bluetooth headsets, electronic watches, gastrointestinal lens swallowing devices, etc.; because of the high requirement on the volume of the rechargeable lithium ion battery, in order to reduce the volume of the battery and ensure the application effect of the battery, the miniature lithium battery with spirally wound or laminated electrodes is adopted, so that the energy density is improved in a limited volume.
Traditional miniature lithium cell generally is two tube-shape epitheca and inferior valve, and through cup jointing epitheca and inferior valve together, is equipped with sealing insulation layer in the centre, because the whole volume of miniature lithium cell is limited, and epitheca, inferior valve, sealing washer all have thickness, can only be through the volume in compression battery chamber in order to guarantee that whole volume size is unchangeable. Meanwhile, the existing micro lithium battery applies work to the electric equipment and is connected with the electric equipment by adopting a battery button, a battery seat or a welding wire; the cost of each aspect of the method is high, the cost of accessories such as a battery buckle, a battery seat, a lead and the like is needed, and particularly, the accessories connected with the battery occupy partial space of small electric equipment of the steel-shell micro lithium battery, so that the capacity of the battery is influenced. The method needs to be connected with electric equipment in modes of soldering, SMT and the like, and the traditional connection mode between the steel-shell miniature lithium battery and the electric equipment needs to remove connecting conductors from two surfaces of the battery, so that the connection with the electric equipment is inconvenient to use.
Disclosure of Invention
The invention aims to solve the problems of the existing miniature lithium battery, and provides the miniature lithium battery which is simple and exquisite in structure, low in manufacturing cost, good in sealing performance, capable of increasing the volume of a battery accommodating cavity, capable of integrating two traditional electrode surfaces into one electrode surface and high in space utilization rate and the preparation method thereof.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a miniature lithium battery includes a case having a bottom surface and a sidewall extending around an edge of the bottom surface; the edge of the upper end of the shell is connected with a cover plate in a sealing mode, and the cover plate and the shell form a hollow containing cavity; the cover plate is provided with a guide hole, the guide hole is sealed through an I-shaped connecting piece, and a sealing insulating piece is arranged between the connecting piece and the shell; an electrode assembly and electrolyte are arranged inside the accommodating cavity; one side of the electrode assembly is connected to the case or the cap plate through a conductor, and the other side of the electrode assembly is connected to the connector through a conductor.
Preferably, the connecting piece comprises a connecting column, a first conducting strip and a second conducting strip which are integrally connected to two ends of the connecting column; the first conducting strip and the second conducting strip are respectively positioned on the outer side and the inner side of the cover plate, and a metal sheet is arranged between the first conducting strip and/or the second conducting strip and the sealing insulating piece.
Preferably, the edge of the guide hole on the cover plate is in a step-shaped concave structure, and the first conductive sheet is located inside the concave.
Preferably, the edge of the guide hole on the cover plate is in a step-shaped boss structure, and the second conductive sheet is located inside the boss.
Preferably, the guide hole is provided at the center or an eccentric position of the cover plate.
Preferably, the sealing insulating part is of an I-shaped structure, a penetrating hole is formed in the center of the sealing insulating part, the connecting column penetrates through the penetrating hole, and the first conducting strip and the second conducting strip are located at two ends of the sealing insulating part respectively.
Preferably, the edge of the upper end of the shell and the edge of the cover plate are welded into a whole by laser; the conductor comprises a positive conductor and a negative conductor, one side of the electrode assembly is connected to the shell or the cover plate through the positive conductor, and the other side of the electrode assembly is connected with the connecting piece through the negative conductor.
Preferably, an insulating pad is arranged between the electrode assembly and the cover plate, and a connecting hole is formed in the position, corresponding to the second conducting strip, of the insulating pad.
Preferably, the electrode assembly has a spiral or laminated structure; the positive electrode conductor is an aluminum foil with the thickness of 0.006-0.018mm, the negative electrode conductor is a copper foil with the thickness of 0.006-0.016mm, and the positive electrode conductor and the negative electrode conductor are in rectangular, strip or strip structures.
A preparation method of a micro lithium battery is used for preparing the micro lithium battery and comprises the following steps:
s1, arranging a guide hole on the cover plate, and extruding the periphery of the guide hole to form an inwards concave step-shaped structure;
s2, providing a sealing insulating piece, and plugging the sealing insulating piece in the guide hole in a sealing manner;
s3, providing a T-shaped connecting piece, inserting the T-shaped connecting piece into the other end of the insulating sealing insulating piece along one end of the insulating sealing insulating piece, and riveting the T-shaped connecting piece to form an I shape;
s4, providing an electrode assembly, wherein one side of the electrode assembly is connected to the shell or the cover plate through a positive electrode conductor in a spot welding mode, and the other side of the electrode assembly is connected with the connecting piece through a negative electrode conductor; and placing the electrode assembly within the case;
s5, injecting electrolyte into the cavity;
and S6, welding the edge of one end of the side wall of the shell far away from the bottom surface and the edge of the cover plate into a whole by laser.
Compared with the prior art, the invention has the beneficial effects that: the micro lithium battery comprises a shell with a bottom surface and a side wall extending around the edge of the bottom surface; the edge of the upper end of the shell is connected with a cover plate in a sealing way, and the cover plate and the shell form a hollow containing cavity; the cover plate is provided with a guide hole, the guide hole is sealed through an I-shaped connecting piece, and a sealing insulating piece is arranged between the connecting piece and the shell; an electrode assembly and electrolyte are arranged inside the accommodating cavity; one side of the electrode assembly is connected to the case or the cap plate through a conductor, and the other side of the electrode assembly is connected to the connector through a conductor. The micro lithium battery has the advantages of simple and exquisite structure and low preparation cost, the cover plate is welded with the edge of the upper end of the shell in a sealing manner, the sealing performance is good, and the volume of the battery accommodating cavity can be increased; the cover plate is provided with the guide hole, the two traditional electrode surfaces are integrated into one electrode surface for use by adopting a connecting piece for sealing and insulating connection, and the capacity and specific energy density of the miniature lithium battery are improved; when the battery is used, accessories such as a battery buckle, a battery seat and a wire are not needed, the space utilization rate of the electric equipment is improved, the production cost and the use cost of the electric equipment are reduced, and meanwhile, the battery accords with the environmental protection idea.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a lithium micro-battery in an embodiment of the invention;
FIG. 2 is an exploded view of a lithium micro battery in an embodiment of the invention;
FIG. 3 is a block diagram of a lithium micro-battery in accordance with another embodiment of the present invention;
FIG. 4 is a block diagram of a lithium micro-battery in accordance with still another embodiment of the present invention;
in the figure: the structure comprises a shell 1, a cover plate 2, a guide hole 21, an electrode assembly 3, a negative conductor 31, a positive conductor 32, a connecting piece 4, a connecting column 41, a first conducting sheet 42, a second conducting sheet 43, a sealing insulating piece 5, a through hole 51, a metal sheet 6 and an insulating pad 7.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
In the description of the present application, it is to be understood that the terms "intermediate," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus should not be construed as limiting the present application. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In addition, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean, for example, that there may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1: referring to fig. 1-4, the present application provides a micro lithium battery including a case 1 having a bottom surface and a sidewall extending around an edge of the bottom surface, the case 1 being made of steel; the edge of the upper end of the shell 1 is connected with a cover plate 2 in a sealing way, and the cover plate 2 and the shell 1 form a hollow cavity; the micro lithium battery is of a cylindrical flat structure, such as a structure of a button battery, the cover plate 2 is of a sheet structure, the cover plate 2 is provided with a guide hole 21, and in the embodiment, in order to ensure the sealing performance of the accommodating cavity, the guide hole 21 is a round hole. An I-shaped connecting piece 4 is arranged in the guide hole 21, and the guide hole 21 is sealed through the connecting piece 4; a sealing insulator 5 is arranged between the connecting piece 4 and the shell 1, the sealing insulator 5 is hermetically plugged in the guide hole 21, in the embodiment, the sealing insulator 5 is also in an i shape, and the sealing insulator 5 can be made of insulating materials such as insulating PVC, insulating PET, insulating glue or insulating paint, ceramic coating film, glass coating film and the like, and has a sealing insulating effect, so that the sealing insulating effect between the connecting piece 4 and the guide hole 21 is ensured. An electrode component 3 and electrolyte are arranged in the accommodating cavity; one side of the electrode assembly 3 is connected to the case 1 or the cap plate 2 by a conductor, and the other side of the electrode assembly 3 is connected to the connection member 4 by a conductor.
Specifically, the connecting member 4 is of an i-shaped structure, and the connecting member 4 includes a connecting column 41, and a first conductive plate 42 and a second conductive plate 43 integrally connected to two ends of the connecting column 41; the first conductive sheet 42 and the second conductive sheet 43 are both in a circular sheet shape and are respectively positioned at the outer side and the inner side of the cover plate 2, and a metal sheet 6 is arranged between the first conductive sheet 42 and/or the second conductive sheet 43 and the sealing insulator 5. In this embodiment, the metal sheet 6 is located between the first conductive sheet 42 and the sealing insulator 5, and since the connecting member 4 is T-shaped and pressed to form an i-shape, in order to avoid damaging the sealing insulator 5 during the pressing process, in this embodiment, the metal sheet is located between the first conductive sheet 42 and the sealing insulator 5, thereby reducing the pressure of the connecting member 4 on the sealing insulator 5 during the pressing process. Furthermore, the sealing insulating member 5 is an i-shaped structure, a penetrating through hole 51 is formed in the center of the sealing insulating member 5, the second conducting strip 43 abuts against one end of the penetrating through hole 51, the connecting column 41 penetrates through the penetrating through hole 51, and the second conducting strip 43 is formed at the other end of the penetrating through hole 51 in a pressing fit mode, so that the first conducting strip 42 and the second conducting strip 43 are located at two ends of the sealing insulating member 5 respectively. In order to avoid the excessive pressing of the connecting column 41 on the sealing insulator 5 during the process of pressing the second conductive sheet 43, in this embodiment, as shown in fig. 1 or fig. 3, a metal sheet 6 is disposed between the first conductive sheet 42 and the sealing insulator 5 for bearing the pressure of the first conductive sheet 42. In another embodiment, as shown in fig. 4, the metal sheet 6 may also be disposed between the second conductive sheet 43 and the sealing insulator 5, or between the first conductive sheet 42 and the sealing insulator 5, or between the second conductive sheet 43 and the sealing insulator 5.
Further, as shown in fig. 1 or fig. 3, in order to ensure that the first conductive sheet 42 and the cover plate 2 maintain the same height and improve the adaptability between the lithium micro battery and the electric equipment, the edge of the guide hole 21 on the cover plate 2 is in a step-shaped recessed structure, and the first conductive sheet 42 is located inside the recess. Because the thickness of the second conducting strip 43 and one end of the sealing insulator 5 are both smaller, the excessive space in the accommodating cavity is not occupied, and the capacity and the specific energy density of the miniature lithium battery are ensured. In another embodiment, in order to further increase the capacity and specific energy density of the lithium micro battery, the edge of the guiding hole 21 on the cover plate 2 is in a step-shaped boss structure, and the second conductive sheet 43 is located inside the boss, so that the volume of the cavity is maximized.
Further, one side of the electrode assembly 3 is connected to the case 1 or the cap plate 2 by a conductor, and the other side of the electrode assembly 3 is connected to the connection member 4 by a conductor. In the present embodiment, the conductors include a positive conductor 32 and a negative conductor 31, since the case 1 is integrally connected to the cover plate 2, one side of the electrode assembly 3 is electrically connected to the case 1 or the cover plate 2 through the positive conductor 32, and the other side of the electrode assembly 3 is electrically connected to the connecting member 4 through the negative conductor 31, in order to avoid the short circuit inside the battery caused by the contact between the negative conductor 31 and the case 1 or the cover plate 2, as shown in fig. 4, a sheet-like insulating pad 7 is disposed between the electrode assembly 3 and the cover plate 2, a connecting hole is disposed at a position of the insulating pad 7 corresponding to the second conductive sheet 43, the diameter of the connecting hole is equal to or smaller than the diameter of the second conductive sheet 43, one end of the negative conductor 31 is connected to the electrode assembly 3, and the other end of the negative conductor 31 passes through the connecting hole and is electrically connected to the second conductive sheet 43.
Further, in the present embodiment, in order to improve the matching degree between the lithium micro battery and the electric device, the guiding hole 21 is disposed in the center of the cover plate 2; in other embodiments, the guide hole 21 may also be disposed at an eccentric position of the cover plate 2, and the eccentric position may correspond to the negative conductor 31, so as to reduce the length of the negative conductor 31, ensure that the negative conductor 31 is not in contact with the cover plate 2 and the housing 1 while being electrically connected to the connecting member 4, and at the same time, the insulating pad 7 is not required, thereby further increasing the volume inside the cavity.
Furthermore, as the sealing insulating part and the connecting part 4 are I-shaped, the diameter of the sealing insulating part on one side of the inner wall of the cover plate 2 can be increased to serve as the insulating pad 7, so that the negative electrode conductor 31 is prevented from contacting the shell 1 or the cover plate 2; the diameter of the sealing insulator on the inner wall side of the cover plate 2 is increased, and the diameter of the second conductive plate 43 is also increased, so that the negative electrode conductor 31 is electrically connected with the second conductive plate 43.
Further, the positive conductor 32 is electrically connected to the cover plate 2 or the housing 1, and the negative conductor 31 is electrically connected to the second conductive sheet 43, where the electrical connection may be one of laser welding, resistance welding, and conductive adhesive connection. Furthermore, the edge of the upper end of the shell 1 and the edge of the cover plate 2 are welded into a whole by laser, so that the sealing performance between the cover plate 2 and the shell is improved; when the shell 1 and the cover plate 2 are welded, the positive conductor 32 can be synchronously welded with the cover plate 2 and the shell, and the welding steps are reduced.
Specifically, the electrode assembly 3 may have a spiral or laminated structure; in the present embodiment, the electrode isolation assembly is in the form of a spiral winding, and its central axis coincides with the central axis of the cover plate 2 or the housing 1. The positive electrode conductor 32 is an aluminum foil with the thickness of 0.006-0.018mm, the negative electrode conductor 31 is a copper foil with the thickness of 0.006-0.016mm, and the positive electrode conductor 32 and the negative electrode conductor 31 are in rectangular, strip or strip structures.
The lithium micro-battery comprises a shell 1 with a bottom surface and a side wall extending around the edge of the bottom surface; the edge of the upper end of the shell 1 is connected with a cover plate 2 in a sealing way, and the cover plate 2 and the shell 1 form a hollow cavity; the cover plate 2 is provided with a guide hole 21, the guide hole 21 is sealed by an I-shaped connecting piece 4, and a sealing insulating piece 5 is arranged between the connecting piece 4 and the shell 1; an electrode assembly 3 and electrolyte are arranged in the accommodating cavity; one side of the electrode assembly 3 is connected to the case 1 or the cap plate 2 by a conductor, and the other side of the electrode assembly 3 is connected to the connection member 4 by a conductor. The micro lithium battery has a simple and exquisite structure and low preparation cost, the cover plate 2 is welded with the edge of the upper end of the shell 1 in a sealing manner, the sealing performance is good, and the volume of a battery accommodating cavity can be increased; the cover plate 2 is provided with the guide hole 21, the two traditional electrode surfaces are integrated into one electrode surface for use by adopting the connecting piece 4 for sealing and insulating connection, and the capacity and specific energy density of the miniature lithium battery are improved; when the battery is used, accessories such as a battery buckle, a battery seat and a wire are not needed, the space utilization rate of the electric equipment is improved, the production cost and the use cost of the electric equipment are reduced, and meanwhile, the battery accords with the environmental protection idea.
Example 2: a method of making a lithium micro battery for use in making the lithium micro battery of example 1, comprising the steps of:
s1, forming a guide hole 21 on the cover plate 2, and extruding the periphery of the guide hole 21 to form an inwards concave step-shaped structure;
s2, providing a sealing insulator 5, and hermetically plugging the sealing insulator 5 into the guide hole 21;
specifically, the sealing insulator 5 is i-shaped, the sealing insulator 5 is adapted to the guide hole 21, and the sealing insulator 5 is hermetically plugged into the guide hole 21, such that two ends of the sealing insulator 5 are exposed out of the guide hole 21 and are clamped at edges of two ends of the guide hole 21.
S3, providing a T-shaped connecting piece, inserting the T-shaped connecting piece into the other end of the sealing insulating piece 5 along one end, and riveting the T-shaped connecting piece to form an I shape;
specifically, in the present embodiment, the connecting member 4 is initially T-shaped, one end of the connecting member 4 penetrates through the insertion hole 51 of the sealing insulating member 5, and the other end is riveted by a pressing device to form an i-shaped connecting member 4;
s4, providing an electrode assembly 3, wherein one side of the electrode assembly 3 is connected to the case 1 or the cap plate 2 through the positive electrode conductor 32 by spot welding, and the other side of the electrode assembly 3 is connected to the connecting member 4 through the negative electrode conductor 31; and the electrode assembly 3 is placed in the case 1;
s5, injecting electrolyte into the cavity;
and S6, welding the edge of one end of the side wall of the shell 1 far away from the bottom surface and the edge of the cover plate 2 into a whole by laser.
Specifically, in the present embodiment, the edges of the case 1 and the cover plate 2 are welded, and the positive conductor 32 is welded between the case 1 and the cover plate 2 simultaneously, so that the number of welding steps is reduced, and the production efficiency is improved.
The preparation method of the miniature lithium battery is convenient and fast to operate, high in production efficiency, large in capacity of the produced miniature lithium battery, good in sealing performance and stability, capable of integrating two electrode surfaces into one electrode surface for use, and capable of improving the capacity and specific energy density of the miniature lithium battery.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. A miniature lithium battery is characterized by comprising a shell with a bottom surface and a side wall extending around the edge of the bottom surface, wherein the edge of the upper end of the shell is hermetically connected with a cover plate, and the cover plate and the shell form a hollow cavity; the cover plate is provided with a guide hole, the guide hole is sealed through an I-shaped connecting piece, and a sealing insulating piece is arranged between the connecting piece and the shell; an electrode assembly and electrolyte are arranged inside the accommodating cavity; one side of the electrode assembly is connected to the case or the cap plate through a conductor, and the other side of the electrode assembly is connected to the connector through a conductor.
2. The lithium micro battery of claim 1, wherein the connecting member comprises a connecting post and a first conductive tab and a second conductive tab integrally connected to both ends of the connecting post; the first conducting strip and the second conducting strip are respectively positioned on the outer side and the inner side of the cover plate, and a metal sheet is arranged between the first conducting strip and/or the second conducting strip and the sealing insulating piece.
3. The lithium micro-battery of claim 2, wherein the edge of the guiding hole on the cover plate is a step-shaped recessed structure, and the first conducting strip is located inside the recess.
4. The lithium micro battery as claimed in claim 2, wherein the edge of the guiding hole on the cover plate is a step-shaped boss structure, and the second conductive sheet is located inside the boss.
5. The lithium micro-battery of claim 2, wherein the guide hole is provided at a center or an eccentric position of the cover plate.
6. The lithium micro-battery according to claim 2, wherein the sealing insulator has an i-shaped structure, a through hole is formed in the center of the sealing insulator, the connection post passes through the through hole, and the first and second conductive sheets are respectively located at two ends of the sealing insulator.
7. The lithium micro battery according to claim 2, wherein an upper end edge of the case and an edge of the cap plate are integrally welded by laser; the conductor comprises a positive conductor and a negative conductor, one side of the electrode assembly is connected to the shell or the cover plate through the positive conductor, and the other side of the electrode assembly is connected with the connecting piece through the negative conductor.
8. The lithium micro battery according to claim 7, wherein an insulating pad is disposed between the electrode assembly and the cap plate, and the insulating pad is provided with a connection hole corresponding to the second conductive sheet.
9. The lithium micro battery according to claim 7, wherein the electrode assembly has a spiral or laminated structure; the positive electrode conductor is an aluminum foil with the thickness of 0.006-0.018mm, the negative electrode conductor is a copper foil with the thickness of 0.006-0.016mm, and the positive electrode conductor and the negative electrode conductor are in rectangular, strip or strip structures.
10. A method for preparing a lithium micro-battery, characterized in that it is used to prepare a lithium micro-battery according to any one of claims 1 to 9, comprising the following steps:
s1, arranging a guide hole on the cover plate, and extruding the periphery of the guide hole to form an inwards concave step-shaped structure;
s2, providing a sealing insulating piece, and plugging the sealing insulating piece in the guide hole in a sealing manner;
s3, providing a T-shaped connecting piece, inserting the T-shaped connecting piece into the other end of the insulating sealing insulating piece along one end of the insulating sealing insulating piece, and riveting the T-shaped connecting piece to form an I shape;
s4, providing an electrode assembly, wherein one side of the electrode assembly is connected to the shell or the cover plate through a positive electrode conductor in a spot welding mode, and the other side of the electrode assembly is connected with the connecting piece through a negative electrode conductor; and placing the electrode assembly within the case;
s5, injecting electrolyte into the cavity;
and S6, welding the edge of one end of the side wall of the shell far away from the bottom surface and the edge of the cover plate into a whole by laser.
CN202110909815.1A 2021-08-09 2021-08-09 Miniature lithium battery and preparation method thereof Pending CN113471513A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023059107A1 (en) * 2021-10-07 2023-04-13 주식회사 엘지에너지솔루션 Button-type secondary battery
WO2023087556A1 (en) * 2021-11-22 2023-05-25 常州微宙电子科技有限公司 Cover plate of lithium ion battery, and lithium ion battery comprising cover plate and explosion-proof method therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023059107A1 (en) * 2021-10-07 2023-04-13 주식회사 엘지에너지솔루션 Button-type secondary battery
WO2023087556A1 (en) * 2021-11-22 2023-05-25 常州微宙电子科技有限公司 Cover plate of lithium ion battery, and lithium ion battery comprising cover plate and explosion-proof method therefor

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