CN217214907U - Lithium ion battery cover plate and lithium ion battery comprising same - Google Patents

Lithium ion battery cover plate and lithium ion battery comprising same Download PDF

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Publication number
CN217214907U
CN217214907U CN202220243010.8U CN202220243010U CN217214907U CN 217214907 U CN217214907 U CN 217214907U CN 202220243010 U CN202220243010 U CN 202220243010U CN 217214907 U CN217214907 U CN 217214907U
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China
Prior art keywords
ring
annular
ion battery
lithium ion
wedge
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CN202220243010.8U
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Chinese (zh)
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罗家文
薛云峰
柳瑞
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Changzhou Weizhou Electronic Technology Co ltd
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Changzhou Weizhou Electronic Technology Co ltd
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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
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M50/183—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
    • H01M50/30—Arrangements for facilitating escape of gases
    • 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)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The utility model relates to a lithium ion battery technical field especially relates to a lithium ion battery apron and lithium ion battery who contains this apron, include: the sealing device comprises rivets, annular sealing rings, an annular outer ring, an upper sealing layer and a lower sealing layer; the rivet comprises an end cover, a cylindrical convex block is formed downwards in the center of the lower surface of the end cover, and a wedge-shaped convex ring is formed on the periphery of the cylindrical convex block; an annular positioning ring extends downwards from the inner ring of the lower surface of the annular sealing ring, and a wedge-shaped positioning ring extends downwards from the lower surface of the annular positioning ring; the annular positioning ring and the wedge-shaped positioning ring are sleeved on the periphery of the cylindrical lug of the rivet, and the inclined surface of the wedge-shaped positioning ring is tightly attached to the inclined surface of the wedge-shaped convex ring; an upper sealing layer is formed between the lower surface of the rivet end cover and the upper surface of the annular sealing ring, and a lower sealing layer is formed between the lower surface of the annular sealing ring and the annular outer ring. The utility model discloses be provided with double seal structure, increased sealed reliability, and simple structure ensures the effective space of microminiature battery, and the security performance is high.

Description

Lithium ion battery cover plate and lithium ion battery comprising same
Technical Field
The utility model relates to a lithium ion battery technical field especially relates to lithium ion battery apron and the lithium ion battery who contains this apron.
Background
A lithium ion battery is a type of secondary battery (rechargeable battery) that mainly operates by movement of lithium ions between a positive electrode and a negative electrode. During the charge and discharge process, lithium ions are intercalated and deintercalated between the two electrodes: during charging, lithium ions are extracted from the positive electrode and are inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.
At present, the packaging structure of the micro button type lithium ion battery mainly has three modes: the upper and lower shells are riveted, the cover plate shell is riveted and the cover plate shell is welded. The most common method is to weld the cover plate shell, and the lithium ion battery cover plates in this method are generally sealed and connected by a metal riveting compression elastic sealing element or by a glue joint. In the metal riveting connection mode, the metal needs to keep pressing the elastic sealing element after deformation, so that enough metal strength needs to be ensured, and the thickness of the lithium ion battery cover plate is thick. In the connection mode of glue joint, although the thickness of the lithium ion battery cover plate is thin, the requirements on the strength, the bonding performance, the thermal expansion performance, the water vapor resistance and the like of the colloid are very high, and at present, no colloid material suitable for mass production can meet the requirements at the same time.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: in order to solve the lithium ion battery apron thick, traditional riveted structure sealing performance is relatively poor, splices the problem that the connection requires height, the utility model provides a pair of lithium ion battery apron is provided with double seal structure, has increased sealed reliability, and simple structure, and apron thickness is thin, and occupation space is little, has ensured the effective space of microminiature battery.
The utility model provides a technical scheme that its technical problem adopted is: a lithium ion battery cover, comprising: the sealing device comprises rivets, annular sealing rings, an annular outer ring, an upper sealing layer and a lower sealing layer; the rivet comprises an end cover, a cylindrical convex block is formed downwards in the center of the lower surface of the end cover, and a wedge-shaped convex ring is formed on the periphery of the cylindrical convex block; an annular positioning ring extends downwards from the inner ring of the lower surface of the annular sealing ring, the central axis of the annular positioning ring is coaxial with the central axis of the annular sealing ring, and a wedge-shaped positioning ring extends downwards from the lower surface of the annular positioning ring; the bottom of the wedge-shaped convex ring is a plane, the upper surface of the wedge-shaped convex ring is an inclined surface, the width of the wedge-shaped convex ring gradually widens from top to bottom, the inner ring of the wedge-shaped positioning ring is an inclined surface, the annular positioning ring and the wedge-shaped positioning ring are both sleeved on the periphery of the cylindrical lug of the rivet, the inner wall of the annular positioning ring is tightly attached to the outer wall of the cylindrical lug, the inclined surface of the wedge-shaped positioning ring is matched with the inclined surface of the wedge-shaped convex ring, and the inclined surface of the wedge-shaped positioning ring is tightly attached to the inclined surface of the wedge-shaped convex ring; the lower surface of the end cover is fixedly bonded with the upper surface of the annular sealing ring, and the upper sealing layer is formed between the lower surface of the rivet end cover and the upper surface of the annular sealing ring; the inner wall cover of annular outer lane body is established the outer wall of annular position circle, the inner wall of annular outer lane body with the outer wall of annular position circle closely laminates, annular seal's lower surface with bond fixedly between the annular outer lane, annular seal's lower surface with form between the annular outer lane sealing layer down. The utility model discloses a lithium ion battery apron pertinence be provided with double seal structure, increased sealed reliability, and simple structure, apron thickness is thin, and occupation space is little, has ensured the effective space of microminiature battery.
Further, specifically, the end cap, the stud bump and the wedge bead are integrally formed.
Further, specifically, the annular sealing ring, the annular positioning ring and the wedge-shaped positioning ring are integrally formed.
Further, specifically, in order to enable the annular sealing ring to be connected with the rivet in a sealing mode, the inner diameter of the annular sealing ring is D1, the outer diameter of the wedge-shaped convex ring 12 is D1, the inner diameter of the annular positioning ring is D2, the outer diameter of the annular positioning ring is D2, the outer diameter of the wedge-shaped positioning ring is D3, the inner diameter of the annular positioning ring is D2-D1, and the outer diameter D3 of the wedge-shaped positioning ring is slightly smaller than D2.
Further, specifically, in order to facilitate connection of the battery cover plate and the metal shell of the lithium ion battery, the outer diameter of the end cover is D4, the outer diameter of the annular sealing ring is D5, the outer diameter of the annular outer ring is D6, and the outer diameter of the end cover is D4 or more and D5 or more and D6 or less.
Further, specifically, in order to further tightly connect the inner wall of the annular outer ring body with the annular sealing ring, an arc-shaped protrusion extends downwards from the inner wall of the annular outer ring body.
Preferably, in order to further connect the battery cover plate with the metal shell of the lithium ion battery and facilitate installation, an annular flange is arranged on the periphery of the lower surface of the annular outer ring, the upper surface of the annular flange is flush with the upper surface of the annular outer ring, and a step surface is formed after the height of the lower surface of the annular flange is greater than that of the lower surface of the annular outer ring.
Further, specifically, the outer diameter d of the lithium ion battery cover plate is 5-20mm, and the thickness h of the lithium ion battery cover plate is less than 2 mm.
Further, specifically, in order to ensure the sealing performance between the rivet and the annular outer ring, the annular sealing ring is made of an insulating elastic material.
Further, specifically, in order to ensure sufficient metal strength of the lithium ion battery cover plate, the rivet and the annular outer ring are both made of metal materials.
A lithium ion battery includes the lithium ion battery cover plate and the metal case as described above. The utility model discloses a lithium ion battery sealing performance is good, and the security performance is high, and manufacturing process is simple, the automated production of being convenient for, and manufacturing cost is lower.
Further, specifically, the metal shell is a hollow cylindrical structure with an opening at one end, a winding core is arranged in an inner cavity of the metal shell, and the lithium ion battery cover plate is arranged at the opening of the metal shell;
the roll core comprises a first current collector and a second current collector, the first current collector is fixedly connected with the metal shell, and the second current collector is fixedly connected with the bottom of the rivet.
Further, specifically, for the firmness of the connection between the lithium ion battery cover plate and the metal shell, the annular flange is fixedly connected with the opening of the metal shell.
Further, specifically, the winding core is arranged in the inner cavity of the metal shell in a winding mode.
Further, specifically, in order to facilitate the rapid diffusion of the heat inside the winding core of the lithium ion battery and the discharge of gas, the center of the winding core is provided with a through hole structure, and the through hole structure is a cylindrical hole.
Preferably, in order to facilitate the assembly of the lithium ion battery, the diameter of the cylindrical hole is D7, the diameter of the cylindrical hole is D7 ≥ D1, and the wedge-shaped convex ring is positioned in the through hole structure.
Preferably, in order to improve the space utilization rate of the winding core in the metal shell, a flared part is arranged at the upper end of the through hole structure, the flared part gradually expands from bottom to top, and the wedge-shaped convex ring is located in the flared part.
Further, specifically, the winding core is laminated in the inner cavity of the metal shell.
Further, specifically, based on the structure of the lithium ion battery cover plate, the lithium ion battery has an explosion-proof pressure relief function at high pressure or high temperature, so that the safety of the lithium ion battery is improved, when the lithium ion battery normally works, the air pressure inside the metal shell is air pressure P, the temperature of the lithium ion battery is temperature T, and when the air pressure inside the metal shell is greater than the air pressure P and/or the temperature is greater than the temperature T, the rivet and the annular sealing ring form a gap, or the rivet and the annular sealing ring are detached from the annular outer ring.
Further, in particular, in order to avoid sudden explosion of the lithium ion battery under high pressure of the lithium ion battery, when the gas pressure inside the metal shell is increased to a first gas pressure threshold, which is greater than the gas pressure P, a first gap is formed between the annular sealing ring and the annular outer ring in response to deformation of the annular outer ring, and a second gap is formed between the arc-shaped protrusion and the wedge-shaped convex ring in response to deformation of the annular outer ring.
Further, specifically, to facilitate the venting of the air pressure inside the metal housing, when the air pressure inside the metal housing increases from a first air pressure threshold to a second air pressure threshold, the second air pressure threshold being greater than the first air pressure threshold, the rivet and the annular seal ring are configured to form a gap in response to the deformation of the annular outer ring, or the rivet and the annular seal ring are configured to fall off the annular outer ring in response to the deformation of the annular outer ring.
Further, specifically, in order to avoid sudden explosion of the lithium ion battery under the condition of high stability of the lithium ion battery, when the temperature of the lithium ion battery rises to a first temperature threshold, the first temperature threshold is greater than the temperature T, and the annular sealing ring deforms.
Further, in particular, to facilitate venting of gas pressure inside the metal casing, when the temperature of the lithium ion battery rises to a second temperature threshold, which is greater than the first temperature threshold, the rivet and the annular seal ring are configured to form a gap in response to deformation of the annular seal ring, or the rivet and the annular seal ring are configured to fall off the annular outer ring in response to deformation of the annular seal ring.
Further, specifically, the annular outer ring is deformed by bending from outside to inside to form a cymbal-like structure bulging in the middle.
Further, specifically, the annular outer ring is bent and deformed from inside to outside to form a conical cover-shaped structure.
The utility model has the advantages as follows:
1. the utility model discloses form the upper seal layer between the lower surface of rivet end cover and the annular seal ring upper surface, form lower sealing layer between annular seal ring's lower surface and the annular outer lane, the seal structure of twice difference of the setting of pertinence has blockked outside steam on the apron, is guaranteeing that seal structure is simpler and under the less condition of thickness, has ensured sealed reliability.
2. The utility model discloses an inclined plane of wedge holding ring and the inclined plane of the protruding circle of wedge cooperate for the inclined plane of wedge holding ring closely laminates with the inclined plane of the protruding circle of wedge, can prevent revealing of the inside electrolyte of battery, has axial (in the vertical direction) and radial (in the horizontal direction) both way compression concurrently, has improved sealed effect, can improve the life of battery, and simple structure, small, can improve the space utilization of microminiature battery structure.
3. The utility model discloses on installing lithium ion battery's metal casing with the lithium ion battery apron, lithium ion battery has explosion-proof pressure release function, has improved the safety in utilization of battery.
4. The utility model discloses lithium ion battery is sealed function, explosion-proof function integration an organic whole, and design benefit is fit, compact structure, and the practicality is good, and space utilization is high.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a cross-sectional view of a lithium ion battery cover plate according to an embodiment of the present invention.
Fig. 2 is a partial enlarged view of the lithium ion battery cover plate a according to the embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a lithium ion battery cover plate according to an embodiment of the present invention.
Fig. 4 is a cross-sectional view of a lithium ion battery according to an embodiment of the present invention.
Fig. 5 is a cross-sectional view of a lithium ion battery according to an embodiment of the present invention.
Fig. 6 is a cross-sectional view of a lithium ion battery according to another embodiment of the present invention.
Fig. 7 is a cross-sectional view of a lithium ion battery according to another embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a lithium ion battery according to an embodiment of the present invention.
Fig. 9 is a schematic diagram illustrating deformation of a lithium ion battery cover according to an embodiment of the present invention.
Fig. 10 is a schematic diagram of the lithium ion battery according to the embodiment of the present invention after explosion.
In the figure, 100, a lithium ion battery cover plate, 1, a rivet, 10, an end cover, 11, a cylindrical convex block, 12, a wedge-shaped convex ring, 2, an annular sealing ring, 20, an annular positioning ring, 21, a wedge-shaped positioning ring, 3, an annular outer ring, 30, an arc-shaped bulge, 31, an annular flange, 4, an upper sealing layer, 5, a lower sealing layer, 6, a metal shell, 61, a first gap, 7, a winding core, 71, a first current collector, 72, a second current collector, 8, a through hole structure, 81 and a flaring part.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-3, the preferred embodiment of the present invention is shown in fig. 1, which is the preferred embodiment of the present invention, a lithium ion battery cover plate, comprising: rivet 1, ring type sealing washer 2, annular outer lane 3, upper seal layer 4 and lower seal layer 5.
The rivet 1 comprises an end cover 10, a cylindrical convex block 11 is formed downwards at the center of the lower surface of the end cover 10, and a wedge-shaped convex ring 12 is formed on the periphery of the cylindrical convex block 11; the rivet 1 is made of a metal material including but not limited to stainless steel, carbon steel or aluminum alloy, and is manufactured by forming methods such as stamping, extrusion, machining, powder metallurgy and the like, wherein the end cover 10, the stud bump 11 and the wedge-shaped convex ring 12 are integrally formed.
An annular positioning ring 20 extends downwards from the inner ring of the lower surface of the annular sealing ring 2, the central axis of the annular positioning ring 20 is coaxial with the central axis of the annular sealing ring 2, and a wedge-shaped positioning ring 21 extends downwards from the lower surface of the annular positioning ring 20; the annular sealing ring 2 is made of an insulating elastic material, including but not limited to polypropylene, polyethylene and PFA plastics, and is formed by injection molding, extrusion and other processing modes, wherein the annular sealing ring 2, the annular positioning ring 20 and the wedge-shaped positioning ring 21 are integrally formed. In order to ensure the density performance of the annular sealing ring 2, the compression ratio range of the annular sealing ring 2 is 40-80%, and the sealing effect of the lithium ion battery cover plate is good.
The annular outer ring 3 is made of a metal material, including but not limited to stainless steel, carbon steel or aluminum alloy, and is manufactured by processing and forming modes such as stamping, extrusion, machining, powder metallurgy and the like.
Specifically, the bottom of the wedge-shaped convex ring 12 is a plane, the upper surface of the wedge-shaped convex ring 12 is an inclined surface, the width of the wedge-shaped convex ring is gradually widened from top to bottom, the inner ring of the wedge-shaped positioning ring 21 is an inclined surface, the annular positioning ring 20 and the wedge-shaped positioning ring 21 are both sleeved on the periphery of the cylindrical bump 11 of the rivet 1, the inner wall of the annular positioning ring 20 is tightly attached to the outer wall of the cylindrical bump 11, the inclined surface of the wedge-shaped positioning ring 21 is matched with the inclined surface of the wedge-shaped convex ring 12, and the inclined surface of the wedge-shaped positioning ring 21 is tightly attached to the inclined surface of the wedge-shaped convex ring 12; the lower surface of the end cover 10 is fixedly bonded with the upper surface of the annular sealing ring 2, and an upper sealing layer 4 is formed between the lower surface of the end cover 10 of the rivet 1 and the upper surface of the annular sealing ring 2; the upper surface of the upper sealing layer 4 is flush with the lower surface of the end cover 10, so that the sealing performance between the end cover 10 of the rivet 1 and the annular sealing ring 2 is better; the inner wall cover of 3 bodies of annular outer lane is established at the outer wall of annular position circle 20, and the inner wall of 3 bodies of annular outer lane closely laminates with the outer wall of annular position circle 20, bonds fixedly between the lower surface of ring type 2 and the annular outer lane 3, forms sealing layer 5 down between the lower surface of ring type 2 and the annular outer lane 3. The outside steam of battery especially under the high temperature condition, can be along sealed route to battery case inner chamber infiltration, the outside steam of battery can produce hydrofluoric acid after mixing with inside electrolyte, battery leakproofness and electrical property can receive serious destruction to become invalid, be provided with seal structure upper seal layer 4 and lower seal layer 5 of twice difference on the apron pertinence for to the sealed of outside steam, blocked outside steam and got into battery case inner chamber, under the less condition of assurance seal structure simpler and thickness, guaranteed sealed reliability. In addition, the electrolyte inside the battery can permeate to the outside of the battery along a sealing path under the high-temperature condition, hydrofluoric acid is generated after the internal electrolyte is mixed with external water vapor, the sealing performance and the electrical performance of the battery can be seriously damaged and lose efficacy, and the annular sealing ring 2 is extruded and deformed through the cylindrical convex block 11 to form elastic compression, so that the compression sealing of the electrolyte is realized.
In some embodiments of the present invention, the wedge-shaped positioning ring 21 can also extrude the annular positioning ring 20 through the wedge-shaped convex ring 12 of the rivet 1, and the partial deformation of the annular positioning ring 20 after the extrusion forms the wedge-shaped positioning ring 21.
In the embodiment, the lower surface of the end cover 10 and the upper surface of the annular sealing ring 2 are bonded and fixed through the sealant to form an upper sealing layer 4, the lower surface of the annular sealing ring 2 and the annular outer ring 3 are bonded and fixed through the sealant to form a lower sealing layer 5, the sealant can be made of rubber, epoxy resin, acrylate and the like, materials with good hydrophobic property, good bonding capacity with plastics and metal, appropriate deformation and the like are preferably selected, and the battery cover plate is ensured to be isolated from external water vapor.
In the embodiment, the inner diameter of the annular sealing ring 2 is D1, the outer diameter of the wedge-shaped convex ring 12 is D1, the inner diameter of the annular positioning ring 20 is D2, the outer diameter of the annular positioning ring 20 is D2, the outer diameter of the wedge-shaped positioning ring 21 is D3, the inner diameter of the annular positioning ring 20 is D2-D1, the outer diameter D3 of the wedge-shaped positioning ring 21 is slightly smaller than D2, and when the outer wall of the annular positioning ring 20 is tightly attached to the annular outer ring 3, the wedge-shaped positioning ring 21 can provide supporting force for the annular outer ring 3.
In the embodiment, the outer diameter of the end cover 10 is D4, the outer diameter of the annular sealing ring 2 is D5, the outer diameter of the annular outer ring 3 is D6, and the outer diameter of the end cover 10 is D4-D5-D6. The end cover 10 has a large outer diameter, the area of the end cover 10 is large, the structural strength is high, when the top of the end cover is extruded downwards by an external force, the sealing effect between the end cover 10 and the annular sealing ring 2 and between the annular sealing ring 2 and the annular outer ring 3 is good, the end cover provides a strong supporting structure for the lithium ion battery cover plate, and the top of the end cover 10 cannot be influenced by the external force to form separation; on the contrary, the external diameter of the wedge-shaped convex ring 12 is small, the area of the bottom of the wedge-shaped convex ring is small, the structural strength is weak, the lithium ion battery cover plate 100 is installed on the metal shell 6, the wedge-shaped convex ring 12 is installed towards the metal shell, when the internal air pressure of the lithium ion battery is large or the temperature is high, the explosion-proof pressure relief function can be formed without an additional explosion-proof structure due to the weak structural strength, and the safety of the lithium ion battery is good.
In the embodiment, the inner wall downwardly extending of 3 bodies in annular outer lane has arc arch 30, and arc arch 30 offsets with wedge holding ring 21 outer wall, and the laminating of arc arch 30 and wedge holding ring 21 outer wall can prevent that 3 bodies in annular outer lane from droing, and the inclined plane of wedge holding ring 21 outwards expands, and upwards provides ascending holding power to the arc arch 30 of 3 bodies in annular outer lane, guarantees the inner wall and the 2 zonulae occludens of annular seal circle of 3 bodies in annular outer lane.
In the embodiment, the outer periphery of the lower surface of the annular outer ring 3 is provided with an annular flange 31, the upper surface of the annular flange 31 is flush with the upper surface of the annular outer ring 3, and the height of the lower surface of the annular flange 31 is greater than that of the lower surface of the annular outer ring 3 to form a step surface for connecting with the metal shell 6.
In the embodiment, the outer diameter d of the lithium ion battery cover plate is 5-20mm, the thickness h of the lithium ion battery cover plate is less than 2mm, the thickness range of the annular sealing ring 2 is 0.1 mm-0.5 mm, and preferably the thickness h of the lithium ion battery cover plate is less than 1mm, so that the problem of poor sealing effect of the cover plate with the size less than 1mm is solved.
In an embodiment, a lithium ion battery cover plate assembly method: according to annular outer lane 3, annular seal 2 and rivet 1's precedence order assembly, at annular outer lane 3, annular seal 2 and rivet 1 three layer construction periphery is compressed tightly the back, through riveting mode processing, annular seal 2 produces local deformation through wedge bulge loop 12, produces elastic deformation to annular seal 2's inner circle and forms elastic compression seal, and riveting mode can be for riveting perpendicularly, radially spin riveting and other extrusion or spin forming, compares with traditional riveted structure, the utility model discloses have axial (in the vertical direction) and radial (in the horizontal direction) two-way compression seal concurrently, and lithium ion battery apron subassembly is few, and is sealed effectual, and apron thickness is thin. .
In the embodiment, an upper sealing layer 4 is formed between the lower surface of the end cover 10 of the lithium ion battery cover plate and the upper surface of the annular sealing ring 2, a lower sealing layer 5 is formed between the lower surface of the annular sealing ring 2 and the annular outer ring 3, and two different sealing structures are pertinently arranged on the lithium ion battery cover plate 100, so that external water vapor is blocked, and the sealing reliability is ensured under the conditions of ensuring simpler sealing structure and smaller thickness. The rivet 1 of the present invention forms a support structure for the lithium ion battery cover plate 100, providing sufficient structural strength. Among the relative prior art, compression seal mainly leans on the axial to realize to the deformation extrusion of elastic seal circle, must occupy great thickness dimension under the prerequisite of guaranteeing enough sealing performance, makes lithium ion battery apron structure, realizes the reliable seal under the miniature yardstick, and the utility model discloses an inclined plane and the inclined plane of wedge bulge loop 12 of wedge holding ring 21 cooperate for the inclined plane of wedge holding ring 21 closely laminates with the inclined plane of wedge bulge loop 12, can prevent revealing of the inside electrolyte of battery, through having axial and radial two-way compression concurrently, make the great improvement of compression seal's effect, increased sealed reliability, can improve the life of battery, and small, can improve the space utilization of microminiature battery structure.
In the embodiment, as shown in fig. 4, the utility model also provides a lithium ion battery, include as above lithium ion battery apron and metal casing 6, metal casing 6 is one end open-ended cavity tubular structure, and metal casing 6's inner chamber is provided with rolls up core 7 and electrolyte, and lithium ion battery apron 100 is located metal casing 6's opening part, and further, annular flange 31 and metal casing 6's opening part fixed connection.
The winding core 7 comprises a first current collector 71 and a second current collector 72, the first current collector 71 is fixedly connected with the metal shell 6, and the second current collector 72 is fixedly connected with the bottom of the rivet 1; the winding core 7 is arranged in the inner cavity of the metal shell 6 in a winding mode, or the winding core 7 is arranged in the inner cavity of the metal shell 6 in a laminated mode.
In the embodiment, as shown in fig. 5, the center of the winding core 7 of the winding type has the through hole structure 8, the lithium ion battery cover plate 100 covers the metal shell 6, the through hole structure 8 is favorable for the rapid diffusion and the gas discharge of the heat inside the lithium ion battery winding core, and when the lithium ion battery is used abnormally, the winding core 7 does not splash out due to the through hole structure at the center of the winding core 7 during the battery explosion.
In an embodiment of the utility model, as shown in fig. 6, through-hole structure 8 can be the cylinder hole, and the diameter in cylinder hole is D7, and the diameter _ D7 in cylinder hole is more than or equal to D1, and the setting of the wedge flange 12 of the bottom of lithium ion battery apron 100 is in through-hole structure 8, and assembly process is simple, the preparation of being convenient for, but space utilization is low.
In another embodiment of the present invention, in order to improve the space utilization, as shown in fig. 7, the upper end of the cylindrical hole is provided with the flared portion 81, and the flared portion 81 gradually expands from bottom to top, the diameter of the wedge-shaped flange 12 located at the larger end of the flared portion 81 is D8, the diameter of the smaller end of the flared portion 81 is D9, the diameter of the larger end of the flared portion 81 is D8> D3, and the diameter of the smaller end of the flared portion 81 is D9< D1, so that the wedge-shaped flange 12 is installed in the flared portion 81, and the space utilization is high.
In practical application, the rivet 1 is a first metal cover body of the lithium ion battery, and the annular outer ring 3 is a second metal cover body of the lithium ion battery, in general, the first metal cover body is an anode of the lithium ion battery, the second metal cover body is a cathode of the lithium ion battery, and the first metal cover body and the second metal cover body are respectively provided with an anode mark and a cathode mark for a welder to distinguish, so that the welding difficulty is further reduced.
The manufacturing method of the lithium ion battery comprises the following steps: the bottom of the assembled lithium ion battery rivet 1 is welded and fixed with the second current collector 72, the winding core 7 is placed in the inner cavity of the metal shell 6, the bottom of the metal shell 6 is welded and connected with the first current collector 71, the annular flange 31 of the annular outer ring 3 is connected with the opening of the metal shell 6 through laser welding, and the manufactured lithium ion battery is as shown in fig. 8.
In the related art, in order to avoid explosion caused by internal pressure rise due to internal thermal runaway under the condition of internal manufacturing defects or abuse of users, an explosion-proof pressure relief structure is generally arranged to ensure that pressure can be timely relieved when the internal air pressure of the lithium ion battery is excessively increased in a long-term use process or a thermal runaway process, so that personal and property safety is protected. In the prior art, common explosion-proof pressure relief structures can be divided into the following two categories: one is a type of explosion-proof pressure relief structure, generally apply to the design of the cover plate of the cylindrical lithium ion battery, generally have cut-off, pressure relief function at the same time, but this kind of structural disadvantage is the structure is complicated, the assembly of more parts is complicated, it is difficult to set up in the microminiature battery that the occupation space is great; the other type of structure is an engraving type explosion-proof pressure relief structure, which has very high requirements on the processing precision of engraving, and is only suitable for engraving metal with low hardness and good ductility, such as aluminum alloy, while carbon steel, stainless steel or other alloys with high hardness are difficult to perform reliable engraving on the premise of ensuring low explosion pressure, and due to the limitation of the use environment, a sufficient deformation space cannot be provided to realize the explosion-proof pressure relief function. The utility model discloses can also solve present microminiature battery space restriction and be difficult to set up the problem of effectual pressure release explosion-proof structure
In the embodiment, as shown in fig. 9-10, when the lithium ion battery normally works, the internal air pressure of the metal shell (6) is air pressure P, the temperature of the lithium ion battery is temperature T, and when the internal air pressure of the lithium ion battery is greater than the air pressure P and/or the temperature is greater than the temperature T, the rivet 1 and the ring-shaped sealing ring 2 of the lithium ion battery cover plate 100 form a gap, or the rivet 1 and the ring-shaped sealing ring 2 fall off from the ring-shaped outer ring 3, the internal thermal runaway or the internal pressure rise is caused under the condition of manufacturing defects or abuse of a user inside the lithium ion battery, so that the lithium ion battery abnormally works. Because annular outer lane 3 can not separate with metal casing 6, and annular outer lane 3 can not the departure, avoided the 6 inner chambers of metal casing roll up core 7 and electrolyte explosion splash, need not to increase extra structural space and manufacturing procedure for lithium ion battery has explosion-proof pressure release function.
In an embodiment, when the gas pressure inside the metal casing increases to a first gas pressure threshold, which is greater than the gas pressure P, the annular seal ring 2 and the annular outer ring 3 are configured to generate a first gap 61 therebetween in response to deformation of the annular outer ring 3, and the arc-shaped protrusions 30 and the wedge-shaped convex rings 12 are configured to generate a second gap therebetween in response to deformation of the annular outer ring 3; further, when the gas pressure inside the metal shell increases from the first gas pressure threshold value to a second gas pressure threshold value, which is greater than the first gas pressure threshold value, the rivet 1 and the annular seal ring 2 are configured to form a gap in response to deformation of the annular outer ring 3, or the rivet 1 and the annular seal ring 2 are configured to fall off the annular outer ring 3 in response to deformation of the annular outer ring 3. Further, the annular outer ring 3 is bent from outside to inside to form a cymbal-shaped structure with a bulging middle, or the annular outer ring 3 is bent from inside to outside to form a cone-shaped cover-shaped structure.
When the temperature of the lithium ion battery rises to a first temperature threshold value, the first temperature threshold value is greater than the temperature T, and the annular sealing ring 2 deforms; further, when the temperature of the lithium ion battery rises to a second temperature threshold value, which is greater than the first temperature threshold value, the rivet 1 and the annular seal ring 2 are configured to form a gap in response to deformation of the annular seal ring 2, or the rivet 1 and the annular seal ring 2 are configured to fall off the annular outer ring 3 in response to deformation of the annular seal ring 2.
In an embodiment, the utility model also provides a lithium ion battery explosion-proof method, lithium ion battery adopt as above lithium ion battery, lithium ion battery explosion-proof method includes when 6 inside atmospheric pressure of metal casing are greater than atmospheric pressure P and/or the temperature is greater than temperature T, and rivet 1 and ring type sealing washer 2 form the clearance, or rivet 1 and ring type sealing washer 2 drop from annular outer lane 3, wherein lithium ion battery explosion-proof method includes: high-pressure explosion-proof method and high-temperature explosion-proof method.
The embodiment of the utility model provides an in, high-pressure explosion-proof method includes following step:
step S1: when the internal air pressure of the metal shell 6 is greater than the air pressure P, the internal air pressure of the metal shell 6 is gradually increased, and the internal air pressure of the metal shell 6 is diffused towards the lithium ion battery cover plate;
step S2: when the air pressure inside the metal shell 6 continues to increase to the first air pressure threshold value in step S1, which is greater than the air pressure inside the metal shell 6, the annular outer ring 3 has a large pressed area and a thin thickness of the annular outer ring 3, the annular outer ring is close to the inside of the metal shell 6, the annular outer ring 3 is bent upwards, the lower sealing layer 5 connected between the annular outer ring 3 and the annular sealing ring 2 is partially separated, so that the connecting part between the annular sealing ring 2 and the annular outer ring 3 is separated, a first gap 61 is formed between the annular sealing ring 2 and the annular outer ring 3, a second gap is formed between the arc-shaped bulge 30 and the wedge-shaped convex ring 12, the second gap is enlarged along with the increase of the air pressure in the metal shell 6, the elastic compression rate of the annular sealing ring 2 is reduced, the tightness of the annular sealing ring 2 is reduced (the tightness is reduced along with the increase of the air pressure), and the gas in the metal shell 6 is discharged in a small amount;
in step S2, when the annular outer ring is deformed due to bending, the arc-shaped protrusion 30 abuts against the annular positioning ring 20 and is acted upward by the air pressure inside the metal shell, the arc-shaped protrusion 30 is connected with the annular positioning ring 20 more tightly, the wedge-shaped positioning ring 21 provides a supporting force for the arc-shaped protrusion 30, the annular sealing ring 2 can also be partially connected with the annular outer ring 3, the rivet 1 is fixed on the annular sealing ring 2, the rivet 1 and the annular sealing ring 2 cannot be separated from the annular outer ring 3 temporarily, however, as the internal gas pressure of the metal shell 6 increases, the second gap increases, the elastic compression rate of the annular sealing ring 2 decreases, the sealing performance of the annular sealing ring 2 decreases, the internal gas of the metal shell 6 is discharged in a small amount, and the lithium ion battery can avoid the continuous increase of the internal pressure due to the small discharge of the internal gas, so that the risk of battery explosion is reduced, and the safety and the stability of the lithium ion battery are further improved.
Step S3: when the first air pressure threshold value is continuously increased to the second air pressure threshold value in the step S2, and the second air pressure threshold value is larger than the first air pressure threshold value, the annular outer ring 3 continuously generates upward bending deformation, the elastic compression rate of the annular sealing ring 2 is continuously reduced, when the annular sealing ring 2 fails in sealing, the lower sealing layer 5 is completely separated, the annular sealing ring 2 and the annular outer ring 3 are connected and failed, a gap is formed between the rivet 1 and the annular sealing ring 2 as well as the annular outer ring 3, or the rivet 1 and the annular sealing ring 2 are ejected from the annular outer ring 3;
step S4: in the step S3, a gap is formed between the rivet 1 and the annular sealing ring 2, or after the rivet 1 and the annular sealing ring 2 are ejected, the rivet 1 and the annular sealing ring 2 are partially or completely separated from the annular outer ring 3, and the gas inside the metal shell 6 is discharged from the gap or the inner ring of the annular outer ring 3, so as to prevent explosion inside the metal shell 6 of the lithium ion battery due to too high air pressure, and to quickly release the pressure of the lithium ion battery.
When the lithium ion battery of the utility model applies pressure to the rivet 1 from the outside, the rivet 1 is supported by the annular sealing ring 2 and the annular outer ring 3, which ensures larger binding force, the sealing structure of the lithium ion battery cover plate 100 has smaller change, the sealing performance is not influenced by external force extrusion force, on the contrary, when the gas pressure inside the metal shell 6 of the lithium ion battery becomes large, the annular outer ring 3 is pressed by the internal pressure to deform, the rivet 1 and the annular seal ring 2 are configured to form a gap or fall off from the annular outer ring 3 in response to the deformation of the annular outer ring 3, gas is discharged from the gap or the inner ring of the annular outer ring 3, because annular outer lane 3 can not separate with metal casing 6, and annular outer lane 3 can not the departure, avoided the 6 inner chambers of metal casing roll up core 7 and electrolyte explosion splash, need not to increase extra structural space and manufacturing procedure for lithium ion battery has explosion-proof pressure release function.
In another embodiment of the present invention, the high temperature explosion-proof method comprises the following steps:
step S11: when the temperature of the lithium ion battery is higher than the temperature T, the temperature of the lithium ion battery rises, and the temperature of the lithium ion battery diffuses towards the direction of the lithium ion battery cover plate;
in step S11, the lithium ion battery may have a high temperature outside or inside due to internal or external short circuit, abnormal charging/discharging, abnormal usage environment (such as abnormal high temperature usage), or storage environment.
Step S12: along with the gradual rise of the temperature of the lithium ion battery, the annular sealing ring 2 deforms elastically, the annular sealing ring 2 softens firstly, when the temperature of the lithium ion battery rises to a first temperature threshold value which is larger than the temperature T, the annular sealing ring 2 is converted into plastic deformation from elastic deformation, the annular sealing ring 2 loses sealing failure gradually, and the gas in the metal shell (6) is discharged in a small amount;
in step S12, the first temperature threshold is a softening value of the ring seal ring 2, and since the ring seal ring 2 is compressed and then elastically deforms to form a compression seal, when the ring seal ring 2 reaches the softening value, the ring seal ring 2 gradually transforms from the compressed elastic deformation to a plastic deformation, the ring seal ring 2 gradually becomes ineffective in sealing, the rivet 1 and the ring outer ring are both connected with the ring seal ring 2 to form a partial separation, a small gap is formed between the rivet 1 and the ring seal ring 2, or a small gap is formed between the ring seal ring 2 and the ring outer ring 3, the gas inside the metal shell is discharged from the small gap in a small amount, and the lithium ion battery can avoid the continuous increase of the internal pressure due to the small amount of internal gas, thereby reducing the risk of battery explosion, and further improving the safety and stability of the lithium ion battery.
Step S13: when the temperature of the lithium ion battery rises to a second temperature threshold value, and the second temperature threshold value is larger than the first temperature threshold value, the connection between the annular sealing ring 2 and the rivet 1 and the annular outer ring 3 fails, the annular sealing ring 2 is separated from the rivet 1 and the annular outer ring 3, a gap is formed between the rivet 1 and the annular sealing ring 2 and the annular outer ring 3, or the rivet 1 and the annular sealing ring 2 are ejected out of the annular outer ring 3;
in step S13, the second temperature threshold is greater than the first temperature threshold, the second temperature threshold is a melting point value of the annular seal ring 2, the melting point value is less than 200 ℃, the annular seal ring 2 will be melted after reaching the melting point value, the connection between the annular seal ring 2 and the rivet 1 and the annular outer ring 3 fails, the annular seal ring 2 will be melted, part of the annular seal ring 2 is bonded to the annular outer ring 3, a gap is formed between the rivet 1 and the annular seal ring 2 and the annular outer ring 3, or the rivet 1 and the annular seal ring 2 are directly ejected from the annular outer ring 3 due to an excessive air pressure inside the metal shell 6.
Step S14: in the step S13, a gap is formed between the rivet 1 and the annular sealing ring 2, or after the rivet 1 and the annular sealing ring 2 are ejected, the rivet 1 and the annular sealing ring 2 are partially or completely separated from the annular outer ring 3, and the gas inside the metal shell 6 is exhausted from the gap or the inner ring of the annular outer ring 3;
in step S14, the gas inside the metal case 6 can be discharged from the gap or from the inner ring of the annular outer ring 3 at a high discharge speed, so as to avoid battery explosion, and the winding core 7 and the electrolyte in the inner cavity of the metal case 6 are exploded and splashed.
In the embodiment, the lithium ion battery of the present invention has the functions of explosion-proof and pressure-relief under both the chronic high pressure generated under mild conditions and the acute high pressure generated under severe conditions, only when the lithium ion battery is under the chronic high pressure, the high-pressure explosion-proof method is used for explosion-proof and pressure-relief, and when the lithium ion battery is under the severe conditions, the high temperature and the high pressure exist simultaneously, when the temperature of the lithium ion battery is too high, the internal air pressure of the metal shell 6 will rise inevitably, so that the two methods of high-pressure explosion-proof and high-temperature explosion-proof will occur, and the more effective and rapid pressure-relief and exhaust effect is realized, because the annular outer ring 3 will not separate from the metal shell 6, and the annular outer ring 3 will not fly out, the core 7 and the electrolyte in the inner cavity of the metal shell 6 are prevented from splashing, and no additional structural space and manufacturing process need to be added, the lithium ion battery has the explosion-proof pressure relief function, and the safety of the lithium ion battery is improved.
The utility model discloses a lithium ion battery apron 100 is installed on metal casing 6, and is sealed function, high-pressure explosion-proof function and the high temperature explosion-proof function integration an organic whole, and design benefit is fit, compact structure, and the practicality is good, and space utilization is high, and the security is high, and preparation simple process, the automated production of being convenient for, manufacturing cost is lower.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (25)

1. A lithium ion battery cover plate, comprising: the sealing device comprises a rivet (1), an annular sealing ring (2), an annular outer ring (3), an upper sealing layer (4) and a lower sealing layer (5);
the rivet (1) comprises an end cover (10), a cylindrical convex block (11) is formed downwards in the center of the lower surface of the end cover (10), and a wedge-shaped convex ring (12) is formed on the periphery of the cylindrical convex block (11);
an annular positioning ring (20) extends downwards from the inner ring of the lower surface of the annular sealing ring (2), the central axis of the annular positioning ring (20) is coaxial with the central axis of the annular sealing ring (2), and a wedge-shaped positioning ring (21) extends downwards from the lower surface of the annular positioning ring (20);
the bottom of the wedge-shaped convex ring (12) is a plane, the upper surface of the wedge-shaped convex ring (12) is an inclined plane, the width of the wedge-shaped convex ring is gradually widened from top to bottom, the inner ring of the wedge-shaped positioning ring (21) is an inclined plane, the annular positioning ring (20) and the wedge-shaped positioning ring (21) are both sleeved on the periphery of the cylindrical convex block (11) of the rivet (1), the inner wall of the annular positioning ring (20) is tightly attached to the outer wall of the cylindrical convex block (11), the inclined plane of the wedge-shaped positioning ring (21) is matched with the inclined plane of the wedge-shaped convex ring (12), and the inclined plane of the wedge-shaped positioning ring (21) is tightly attached to the inclined plane of the wedge-shaped convex ring (12); the lower surface of the end cover (10) is fixedly bonded with the upper surface of the annular sealing ring (2), and the upper sealing layer (4) is formed between the lower surface of the end cover (10) of the rivet (1) and the upper surface of the annular sealing ring (2);
the inner wall cover of annular outer lane (3) body is established the outer wall of annular position circle (20), the inner wall of annular outer lane (3) body with the outer wall of annular position circle (20) closely laminates, the lower surface of annular seal ring (2) with it is fixed to bond between annular outer lane (3), the lower surface of annular seal ring (2) with form between annular outer lane (3) sealing layer (5) down.
2. The lithium ion battery cover plate of claim 1, wherein the end cap (10), the stud bump (11), and the wedge bead (12) are integrally formed.
3. The lithium ion battery cover plate according to claim 1, characterized in that the annular sealing ring (2), the annular positioning ring (20) and the wedge-shaped positioning ring (21) are integrally formed.
4. The lithium ion battery cover plate of claim 3, wherein the inner diameter of the annular sealing ring (2) is D1, the outer diameter of the wedge-shaped convex ring (12) is D1, the inner diameter of the annular positioning ring (20) is D2, the outer diameter of the annular positioning ring (20) is D2, the outer diameter of the wedge-shaped positioning ring (21) is D3, the inner diameter of the annular positioning ring (20) is D2= D1, and the outer diameter D3 of the wedge-shaped positioning ring (21) is slightly smaller than D2.
5. The lithium ion battery cover plate according to claim 3, wherein the outer diameter of the end cover (10) is D4, the outer diameter of the annular sealing ring (2) is D5, the outer diameter of the annular outer ring (3) is D6, and the outer diameter of the end cover (10) is D4 ≤ D5 ≤ D6.
6. The lithium ion battery cover plate according to claim 1, wherein the inner wall of the body of the annular outer ring (3) extends downwards to form an arc-shaped bulge (30).
7. The lithium ion battery cover plate according to claim 6, wherein an annular flange (31) is arranged on the periphery of the lower surface of the annular outer ring (3), the upper surface of the annular flange (31) is flush with the upper surface of the annular outer ring (3), and a step surface is formed after the height of the lower surface of the annular flange (31) is greater than that of the lower surface of the annular outer ring (3).
8. The lithium ion battery cover plate according to claim 1, wherein the lithium ion battery cover plate (100) has an outer diameter d of 5-20mm, and the thickness h of the lithium ion battery cover plate (100) is less than 2 mm.
9. The lithium ion battery cover plate according to claim 1, wherein the material of the annular sealing ring (2) is an insulating elastic material.
10. The lithium ion battery cover plate according to claim 1, wherein the rivet (1) and the annular outer ring (3) are made of metal materials.
11. A lithium ion battery, characterized in that it comprises a lithium ion battery cover plate according to claim 7 and a metal casing (6).
12. The lithium ion battery according to claim 11, wherein the metal shell (6) is a hollow cylindrical structure with an open end, a winding core (7) is arranged in an inner cavity of the metal shell (6), and the lithium ion battery cover plate is arranged at the opening of the metal shell (6);
the winding core (7) comprises a first current collector (71) and a second current collector (72), the first current collector (71) is fixedly connected with the bottom of the metal shell (6), and the second current collector (72) is fixedly connected with the bottom of the rivet (1).
13. The lithium ion battery according to claim 12, characterized in that the annular flange (31) is fixedly connected to the opening of the metal casing (6).
14. The lithium ion battery according to claim 12, characterized in that the winding core (7) is arranged in a winding manner in the inner cavity of the metal shell (6).
15. The lithium ion battery according to claim 14, characterized in that the center of the winding core (7) has a through hole structure (8) which is a cylindrical hole.
16. The lithium ion battery of claim 15, wherein the diameter of the cylindrical hole is D7, the diameter of the cylindrical hole is D7 ≧ D1, and the wedge-shaped convex ring (12) is located in the through hole structure (8).
17. The lithium ion battery according to claim 15, characterized in that the upper end of the through hole structure (8) is provided with a flared part (81), the flared part (81) is gradually expanded from bottom to top, and the wedge-shaped convex ring (12) is positioned in the flared part (81).
18. The lithium ion battery according to claim 12, characterized in that the winding core (7) is arranged in a laminated manner in the inner cavity of the metal casing (6).
19. The lithium ion battery according to claim 12, wherein when the lithium ion battery is in normal operation, the gas pressure inside the metal shell (6) is a gas pressure P, and the temperature of the lithium ion battery is a temperature T, and when the gas pressure inside the metal shell (6) is higher than the gas pressure P and/or the temperature is higher than the temperature T, the rivet (1) and the annular sealing ring (2) form a gap, or the rivet (1) and the annular sealing ring fall off from the annular outer ring (3).
20. The lithium ion battery according to claim 19, wherein when the gas pressure inside the metal casing increases to a first gas pressure threshold, which is greater than the gas pressure P, a first gap (61) is configured to be generated between the annular sealing ring (2) and the annular outer ring (3) in response to deformation of the annular outer ring (3), and a second gap is configured to be generated between the arc-shaped protrusion (30) and the wedge-shaped convex ring (12) in response to deformation of the annular outer ring (3).
21. The lithium ion battery according to claim 20, characterized in that when the gas pressure inside the metal casing increases from a first gas pressure threshold to a second gas pressure threshold, the second gas pressure threshold being greater than the first gas pressure threshold, the rivet (1) and the annular seal ring (2) are configured to form a gap in response to deformation of the annular outer ring (3), or the rivet (1) and the annular seal ring (2) are configured to fall off the annular outer ring (3) in response to deformation of the annular outer ring (3).
22. The lithium-ion battery according to claim 19, characterized in that the annular sealing ring (2) deforms when the temperature of the lithium-ion battery rises to a first temperature threshold, which is greater than the temperature T.
23. The lithium ion battery according to claim 22, characterized in that when the temperature of the lithium ion battery rises to a second temperature threshold, which is greater than the first temperature threshold, the rivet (1) and the ring seal (2) are configured to form a gap in response to deformation of the ring seal (2), or the rivet (1) and the ring seal (2) are configured to fall off the outer ring (3) in response to deformation of the ring seal (2).
24. The lithium ion battery according to claim 21, wherein the annular outer ring (3) is deformed by bending from outside to inside to form a cymbal-like structure bulging in the middle.
25. The lithium ion battery according to claim 21, characterized in that the annular outer ring (3) is bent from the inside to the outside to form a cone-shaped cap-like structure.
CN202220243010.8U 2021-11-22 2022-01-29 Lithium ion battery cover plate and lithium ion battery comprising same Active CN217214907U (en)

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CN202122864049X 2021-11-22

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JP2015185223A (en) * 2014-03-20 2015-10-22 日立マクセル株式会社 sealed battery
CN210576046U (en) * 2019-08-12 2020-05-19 王银洲 Sealing element for lithium ion battery capacitor
US11799158B2 (en) * 2020-12-29 2023-10-24 Zhuhai Zhi Li Battery Co., Ltd. Top plate for laser welded lithium-ion button cell battery
CN112968235B (en) * 2021-02-03 2022-10-14 惠州亿纬锂能股份有限公司 Battery cap and battery
CN113471513A (en) * 2021-08-09 2021-10-01 东莞市电的电子有限公司 Miniature lithium battery and preparation method thereof

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