CN217788565U - Button cell - Google Patents

Abstract

The utility model discloses a button cell relates to micro battery technical field. The electrode plate is connected to the surface wall of the connecting ring through sealing insulating glue and used for covering the through hole, and the connecting ring is welded with the upper end edge of the shell; an electrode assembly and electrolyte are arranged in the shell, one side of the electrode assembly is electrically connected to the inner wall of the shell through a conductor, and the other side of the electrode assembly is electrically connected with the electrode plate through a conductor. The button cell has simple and exquisite structural design and low manufacturing cost, can improve the capacity and the specific energy density of the button cell, has good sealing, explosion-proof and corrosion-resistant performances, and has long storage time and service life.

Description

Button cell

Technical Field

The utility model relates to a micro battery technical field especially relates to a button cell.

Background

With the development of electronic technology, microelectronic technology and modern intelligent wearable equipment, the market continuously increases the power supply requirements on the electronic equipment, and the electronic equipment tends to be more miniaturized and has higher energy density; meanwhile, equipment is required to be convenient to carry, and better endurance experience is achieved, for example, wireless TWS Bluetooth earphones, hearing aids, electronic gastroscopes, 3D glasses and the like need to be miniaturized and lightened, and endurance of power supply needs to be met, so that higher requirements are provided for the size and the quality of a battery.

The small soft-package polymer battery and the button battery in the current market occupy a certain volume due to the structure and the shell packaging, so that the energy density is difficult to improve; especially in smaller and more precise equipment, the requirements on the placement space and the corrosion resistance of the battery are greatly increased, because the traditional steel shell button battery generates hydrofluoric acid under the condition that the electrolyte has trace moisture (trace moisture is unavoidable), and the anode metal of the steel shell button battery is easy to generate electric corrosion under the conditions of voltage and hydrofluoric acid after the battery is charged. The performance of the battery is seriously influenced by the loss of the battery capacity, the increase of the internal resistance of the battery after a period of time and the cycle performance of the battery, and the battery is completely damaged after the electric corrosion is deepened, so that the popularization and the use of the battery in the field of precision equipment are directly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems of the prior micro battery, and provides a button battery which has simple and exquisite structure, low manufacturing cost, high capacity and specific energy density, sealing performance, explosion-proof performance and good corrosion resistance.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

a button battery comprises a shell with a bottom surface and a side wall extending around the edge of the bottom surface, wherein a cap is connected to the upper end edge of the shell, the cap comprises a connecting ring with a through hole in the middle and an electrode plate which is connected to the surface wall of the connecting ring through sealing insulating glue and used for covering the through hole, and the connecting ring is welded with the upper end edge of the shell; an electrode assembly and electrolyte are arranged in the shell, one side of the electrode assembly is electrically connected to the inner wall of the shell through a conductor, and the other side of the electrode assembly is electrically connected with the electrode plate through a conductor.

Preferably, a stepped recess is provided around the periphery of the connection ring, said recess being adapted to the upper end edge of the housing.

Preferably, the connection ring is laser-welded or resistance-welded to the upper end edge of the housing.

Preferably, the electrode plate is of a disc-shaped structure and is arranged coaxially with the connecting ring, and the diameter of the electrode plate is larger than the aperture of the through hole and smaller than the outer diameter of the connecting ring.

Preferably, the sealing insulating glue is made of modified polyethylene or epoxy resin.

Preferably, the yield strength of the modified polyethylene is greater than or equal to 28MP, the breaking strength is greater than or equal to 30MP, the breaking elongation is greater than or equal to 500%, the softening temperature is greater than or equal to 90 ℃, and the softening temperature is greater than or equal to 90 ℃.

Preferably, the diameter of the through hole is larger than 1/3 of the outer diameter of the connection ring.

Preferably, the electrode plate is attached to the outer wall or the inner wall of the connecting ring.

Preferably, the electrode plate is a positive electrode, one side of the electrode assembly is electrically connected to the inner wall of the electrode plate through a positive electrode conductor, and the other side of the electrode assembly is electrically connected to the inner wall of the case through a negative electrode conductor.

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.

Compared with the prior art, the beneficial effects of the utility model reside in that: the button cell has simple and exquisite structural design, and the cap is directly welded with the edge of the upper end of the shell, so that the sealing performance is good, and the capacity and the specific energy density of the button cell can be improved; the connecting ring is welded with the edge of the upper end of the shell, the electrode plate is connected with the connecting ring in an insulating and sealing manner, the electrode plate and the shell or the connecting ring respectively form two electrodes of the button cell, two electrode surfaces of the traditional button cell can be integrated on one surface for use, the space of the electric equipment for fixing the cell is enlarged, and the volume of the electric equipment can be further reduced; the button cell is good in explosion-proof performance, the electrode plates are connected with the connecting rings through the sealing insulating glue, when the air pressure in the shell is increased and the shell expands and is heated, the sealing insulating glue is softened and decompressed to achieve the purpose of explosion prevention, and serious accidents caused by expansion explosion or ignition of the button cell are avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 structural diagram of a button cell in an embodiment of the present invention;

fig. 2 is an exploded view of a button cell in an embodiment of the present invention;

fig. 3 is a structural diagram of a button cell in another embodiment of the present invention;

in the figure: the battery comprises a shell 1, a connecting ring 2, a through hole 21, a groove 22, an electrode plate 3, a sealing insulating glue 4, an electrode assembly 5, a positive electrode conductor 51, a negative electrode conductor 52 and an insulating pad 6.

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. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

Example (b): referring to fig. 1-3, the utility model discloses mainly to current button cell capacity or specific energy density are little, do not have explosion-proof function, corrosion resisting property is poor, some problems such as life cycle is short, provide a button cell, as shown in fig. 1, this button cell is including having the bottom surface and surrounding the casing 1 of the lateral wall of bottom surface edge extension, casing 1 is stainless steel, casing 1 is upper end open-ended tubular structure in this embodiment, single wall thickness is 0.1-0.25 mm, casing 1's upper end edge connection has the block in order to form hollow appearance chamber.

The cap comprises a connecting ring 2 with a through hole 21 in the middle and an electrode plate 3 which is connected to the surface wall of the connecting ring 2 through a sealing insulating glue 4 and is used for covering the through hole 21, and the connecting ring 2 is welded with the upper end edge of the shell 1; in this embodiment, go up end through laser welding or resistance welding one-piece structure of go-between 2's outer lane and block, adopt sealed insulating cement 4 to carry out sealed insulation between electrode slice 3 and the go-between 2 and be connected, can improve the sealing performance who holds the intracavity, avoided the weeping gas leakage risk, guaranteed battery storage performance and life to the power consumption safety has been improved. The traditional steel shell button battery is easy to explode to hurt people and damage electrical equipment under the condition that the battery is heated due to structural limitation. The steel shell battery with the structure is thrown into fire or accidents and the like to cause the battery to be heated or the battery to be short-circuited to generate heat, because the cap and the object are welded by laser, the internal pressure required to be burst is far greater than the heated sealing insulating glue 4, firstly, the sealing insulating glue 4 is softened and loses the sealing effect, so that the pressure relief is realized to achieve the purpose of explosion prevention, and the explosion prevention can be realized by softening the sealing insulating glue 4 during the heat abuse of the battery.

The button cell has good explosion-proof performance, the electrode plates 3 are connected with the connecting rings 2 through the sealing insulating glue 4, when the air pressure in the shell 1 is increased and the shell 1 expands and is heated, the sealing insulating glue 4 is softened and decompressed to achieve the purpose of explosion-proof, and serious accidents caused by expansion explosion or ignition of the button cell are avoided; the surface of the electrode plate 3 of the button cell has better corrosion resistance after being treated, and the service life of the button cell can be prolonged.

Furthermore, the electrode plate 3 is used as one electrode of the button cell, the shell 1 and/or the connecting ring 2 is used as the other electrode of the button cell, an electrode assembly 5 and electrolyte are arranged in the shell 1, one side of the electrode assembly 5 is electrically connected to the inner wall of the shell 1 through a conductor, and the other side of the electrode assembly 5 is electrically connected with the electrode plate 3 through a conductor. In the present embodiment, the electrode tab 3 is a positive electrode, the case 1 and/or the connection ring 2 is a negative electrode, one side of the electrode assembly 5 is welded to the inner wall of the electrode tab 3 through a positive electrode conductor 51, and the other side of the electrode assembly 5 is welded to the bottom wall of the case 1 through a negative electrode conductor 52.

In a specific embodiment, as shown in fig. 1 and 2, the electrode plate 3 is a disk-shaped structure, the diameter of the electrode plate 3 is larger than the inner diameter of the connection ring 2 and smaller than the outer diameter of the connection ring 2, and the electrode plate 3 is coaxially attached to the inner wall of the connection ring 2 through a sealing insulating glue 4; the through hole 21 is a circular hole, and the aperture of the through hole 21 is larger than 1/3 of the outer diameter of the connecting ring 2. Through setting up through-hole 21, can be convenient for the consumer to be connected with electrode slice 3 electricity, of course, through-hole 21 still can design into the polygon hole according to actual demand, and the aperture of through-hole 21 also can be less than or equal to 1/3 of go-between 2 external diameters, only need satisfy the consumer can be connected with electrode slice 3 electricity, simultaneously can not lead to the battery short circuit can. In the embodiment, the electrode plate 3 is used as one electrode of the battery, the connection ring 2 is used as the other electrode of the battery, and two electrode surfaces of the battery can be integrated on one electrode surface for use; meanwhile, when an electrode surface is integrated, the cost of accessories such as a battery buckle, a battery seat and a lead is not needed for the electric equipment, the production cost and the use cost of the electric equipment are reduced, and the environmental protection concept is met.

In another specific embodiment, as shown in fig. 3, the electrode plate 3 is coaxially attached to the outer wall of the connection ring 2 by a sealing insulation paste 4; the electrode plate 3 is a positive electrode, the casing 1 and/or the connecting ring 2 is a negative electrode, and as the diameter of the electrode plate 3 is larger than the inner diameter of the connecting ring 2 and smaller than the outer diameter of the connecting ring 2, in the embodiment, two electrode surfaces of the battery can be integrated into one electrode surface for use; one side of the electrode assembly 5 is welded to the inner wall of the electrode tab 3 through the through-hole 21 by a positive electrode conductor 51, and the other side of the electrode assembly 5 is welded to the inner wall of the case 1 by a negative electrode conductor 52. Of course, in order to avoid the positive electrode conductor 51 contacting the inner wall of the connection ring 2 to cause short circuit of the battery, in the present embodiment, the inner wall of the connection ring 2 is provided with the thin sheet-like insulating pad 6, and the positive electrode conductor 51 is prevented from contacting the inner wall of the connection ring 2 by the insulating pad 6.

Specifically, for the convenience of assembly between improvement block and the casing 1, in this embodiment, the periphery that encircles go-between 2 is equipped with step-like recess 22, and recess 22 and casing 1's upper end edge looks adaptation can avoid the block to shift before with casing 1 welding, lead to producing assembly error, improve the assembly precision, have improved the welded convenience simultaneously.

Specifically, the sealing insulating glue is made of modified polyethylene or epoxy resin; in this embodiment, the sealing insulating adhesive 4 is made of modified polypropylene, specifically modified in the following manner: the modified lithium-ion battery is prepared by chemical modification and copolymerization and then further blending in a physical mode, has excellent performance, and meets the requirements of impact resistance and creep resistance of the battery. Through tests, the physical properties of the modified sealing insulating glue 4 reach: the yield strength is more than 28MP, the breaking strength is more than 30MP, the toughness is very good, and the breaking elongation is 500 percent. The modified sealing insulating glue 4 interacts with the processed electrode slice 3 to form a stable hydrogen bond, and the sealing performance is good. Traditional box-hat button cell is sealed with the extrusion usually, has the insulating sealing layer of one deck to pass through the mould extrusion and seals its effect promptly between metal casing and the outer metal casing in the battery to be unfavorable for the storage of battery and the life-span of battery in the semi-enclosed state, also does not have explosion-proof effects simultaneously. Of course, the sealing insulating adhesive 4 may be an epoxy resin type metal-philic adhesive, for example, HS1021 epoxy adhesive, RS2211 hot melt adhesive, and the like are not limited to the above.

Furthermore, the softening temperature of the sealing insulating glue is set to be greater than or equal to 90 degrees, and when the temperature of the battery reaches 90 degrees during thermal abuse of the battery, the pressure begins to be released to achieve the anti-explosion purpose. Specifically, the steel shell battery with the structure is thrown into fire or in an accident situation, and the like, so that the battery is heated or the battery is short-circuited to generate heat, because the cap and the object are welded by laser, the internal pressure required to be burst is far greater than the heated sealing insulating glue 4, firstly, the sealing insulating glue 4 is softened and loses the sealing effect, and the pressure is released to achieve the anti-explosion purpose, so that once the temperature reaches 90 ℃ during the heat abuse of the battery, the anti-explosion purpose can be achieved by softening and releasing the pressure of the sealing insulating glue 4.

Specifically, the electrode assembly 5 has a spiral or laminated structure; the positive conductor 51 is an aluminum foil with the thickness of 0.006-0.018mm, the negative conductor 52 is a copper foil with the thickness of 0.006-0.016mm, and the positive conductor 51 and the negative conductor 52 are in rectangular, strip or strip structures. In the present embodiment, there are two ways for the electrode assembly 5 to fabricate the cell: the first method comprises the following steps: the electrode assembly 5 is electrically connected with the shell 1 or the electrode plate 3 through a long rectangular positive electrode plate and at least one metal conductor, and the electrode assembly is electrically connected with the electrode plate 3 or the shell 1 through a layer of isolating piece and a long rectangular negative electrode plate and at least one metal conductor; and a further layer of separator, 4 layers in total, are wound together to form a cylindrical electrode assembly 5. The second mode is as follows: and punching and cutting the manufactured positive and negative electrodes into a table tennis bat shape, wherein the handles of the positive and negative electrodes in the table tennis bat shape are not coated with positive and negative electrode materials, and only comprise current collector copper foils and aluminum foils of positive and negative electrodes. The spacer is punched into a circular piece of the desired size. The assembly mode of the electrode assembly 5 is that the separator, the negative electrode in the shape of a table tennis bat, the separator and the positive electrode in the shape of a table tennis bat are sequentially stacked until the required thickness is a cylinder; the negative electrode and the positive electrode are aligned with the table tennis bat-shaped handle, and the positive and negative handles form an angle of 180 degrees; then the positive and negative electrodes are respectively welded with two metal conductors, and the two metal conductors are respectively electrically connected with the battery shell 1 and the electrode plate 3 to form the battery. In this embodiment, the positive electrode conductor 51 (i.e., the positive electrode electrolyte) is aluminum foil coated lithium cobaltate or other positive electrode material with a thickness of 0.006-0.018mm to form the positive electrode, and the negative electrode conductor 52 (i.e., the negative electrode electrolyte) is copper foil coated graphite with a thickness of 0.006-0.016mm to form the negative electrode.

Specifically, for improving the adhesiveness between sealing insulating glue 4 and the connecting ring 2 and the electrode plate 3, and improving the corrosion resistance of the electrode plate 3, the utility model also provides a surface treatment process of the cap, which is used for treating the cap in the embodiment, the process comprises the following steps:

s1, preparing a first treatment solution, wherein the first treatment solution takes water or deionized water as a solvent, and the method further comprises the following steps: 15-35 g/L of hexavalent chromium, 25-45 g/L of phosphide and 5-15 g/L of fluoride;

the hexavalent chromium compound is chromium chloride and/or potassium dichromate; the phosphide is phosphoric acid and/or polyphosphoric acid; the fluoride is ammonium fluoride and/or acidic sodium fluoride;

in a preferred embodiment, water or deionized water is used as a solvent, and 25g/L of chromium chloride, 35g/L of phosphoric acid and 10g/L of ammonium fluoride are added to prepare a first treatment solution.

S2, treating the electrode plate 3 and the connecting ring 2 by adopting a first treatment solution, heating the first treatment solution to 40-70 ℃, spraying the heated first treatment solution on the electrode plate 3 and the connecting ring 2 for 5-10 minutes or soaking the electrode plate 3 and the connecting ring 2 in the heated first treatment solution for 3-6 minutes, and cleaning by using tap water after treatment;

in this embodiment, firstly, the electrode plate 3 and the connecting ring 2 are manufactured by stamping, and the material is preferably stainless steel or aluminum, and the electrode plate 3 and the connecting ring 2 are processed by the first processing liquid configured in the step S1; preferably, the first treatment liquid is heated to 50 ℃, and the heated first treatment liquid is sprayed on the electrode plate 3 and the connecting ring 2 for 8 minutes or the electrode plate 3 and the connecting ring 2 are soaked in the heated first treatment liquid for 4 minutes, and then the first treatment liquid is washed by tap water after being treated.

S3, preparing a second treatment solution, wherein the second treatment solution takes water or deionized water as a solvent, and the method further comprises the following steps: 25-45 g/L of organic acid, 10-20 g/L of fluorine compound and 5-15 g/L of inorganic acid;

the organic acid is oxalic acid and/or acrylic acid, the fluorine compound is ammonium fluoride and/or acidic sodium fluoride, and the inorganic acid is phosphoric acid and/or hydrochloric acid;

in a preferred embodiment, water or deionized water is used as a solvent, and 35g/L oxalic acid, 15g/L ammonium fluoride and 10g/L phosphoric acid are added to prepare a second treatment solution.

S4, treating the electrode plate 3 and the connecting ring 2 obtained in the step S2 again by using a second treatment solution, heating the second treatment solution to 40-70 ℃, spraying the heated second treatment solution on the electrode plate 3 and the connecting ring 2 for 5-10 minutes or soaking the electrode plate 3 and the connecting ring 2 in the heated second treatment solution for 3-6 minutes, and cleaning by using tap water after treatment;

in this embodiment, the electrode sheet 3 and the connection ring 2 processed in step S2 are further processed with the second processing liquid; preferably, the second treatment liquid is heated to 55 ℃, and the heated second treatment liquid is sprayed on the electrode plate 3 and the connecting ring 2 for 8 minutes or the electrode plate 3 and the connecting ring 2 are soaked in the heated first treatment liquid for 4 minutes, and then the electrode plate and the connecting ring are cleaned by tap water after treatment.

S5, drying the electrode plate 3 and the connecting ring 2 at 80-120 ℃ for later use.

In this embodiment, the electrode sheet 3 processed in step S4 is dried in an oven for standby, and the temperature is adjusted to 100 ℃.

After the electrode plate 3 and the connecting ring 2 are processed by the process steps S1-S5, a compact chemical film layer is formed on the metal surface, and the function of the compact chemical film layer is two aspects:

1. the electrode plate 3 and the connecting ring 2 of the battery cap with the structure are firmly adhered together through the sealing insulating glue 4, and the electrode plate 3 and the connecting ring 2 manufactured by the method form a stable hydrogen bond after being combined together through the sealing insulating glue 4 manufactured in the above way; namely, the sealing insulating glue 4, the electrode plate 3 and the chemical layer on the metal surface of the connecting ring 2 form a stable intermolecular hydrogen bond to form a whole, so as to achieve firm bonding force; the test shows that the electrolyte resistance is excellent; it was tested that the electrolyte was fully tolerated by immersion for 10 hours in an electrolyte containing 2000ppm of water at 85 ℃. The battery storage performance and the long-term sealing performance in the subsequent use process can be ensured, and the safety of the battery and the electric equipment is improved.

2. The electrode plates 3 and the connecting rings 2 processed by the method have extremely stable chemical film layers on the metal (stainless steel) surface layers, so that the manufactured battery can bear higher voltage than the traditional battery, and further can use anode and cathode materials with higher voltage to further improve the energy density of the battery. The voltage of the traditional button lithium ion battery is 4.2 volts, and the battery voltage of the mode can be 4.5 volts or even higher without corrosion through tests. Because the traditional steel shell button cell generates hydrofluoric acid under the condition that the electrolyte has trace moisture (trace moisture is inevitable). After the battery is charged, the anode metal of the steel shell button battery is easy to generate electric corrosion under the conditions of voltage and hydrofluoric acid, namely, the electrode plate 3 in the embodiment is easy to generate electric corrosion. The performance which seriously affects the battery comprises the loss of the battery capacity, the increase of the internal resistance of the battery after a period of time, the cycle performance of the battery, and the complete damage of the battery after the electric corrosion is deepened, so the electrode plate 3 treated by the process has better corrosion resistance.

Since the positive electrode has a higher potential and is easily corroded, and the electrode tab 3 is used as the positive electrode and the case 1 is used as the negative electrode in this embodiment, the electrode tab 3 is subjected to the above-described process steps S1 to S5. Of course, in another embodiment, if the case 1 is electrically connected to the positive electrode of the electrode assembly 5, that is, the case 1 is the positive electrode and the electrode tab 3 is the negative electrode, since the negative electrode of the battery is at a low potential, there is no galvanic corrosion as described above, so the case 1 also needs to be processed through the above-mentioned S1 to S5 process steps in this embodiment, and the electrode tab 3 does not need to be processed, which will not be described repeatedly.

The button cell comprises the following assembly steps:

a. punching according to the specification of the button battery to manufacture a round stainless steel or aluminum electrode plate 3 and a connecting ring 2;

b. carrying out the processing of the S1-S5 process steps on the electrode plate 3 and the connecting ring 2;

c. sealing, insulating and hot-pressing the electrode plate 3 and the connecting ring 2 by adopting a sealing insulating adhesive 4;

d. assembling the electrode assembly 5 into the case 1, and injecting an electrolyte;

e. the edge of the cap and the upper end of the shell 1 are hermetically welded by laser welding, and the positive conductor 51 and the negative conductor 52 are welded to the inner wall of the electrode plate 3 and the inner wall of the shell 1 respectively by resistance welding or laser penetration welding.

The button cell is simple and exquisite in structural design, the cap is directly welded with the edge of the upper end of the shell 1, the sealing performance is good, and the capacity and the specific energy density of the button cell can be improved; compared with the traditional steel shell button battery, the battery inner volume is effectively increased under the same appearance volume, the battery diameter is 6-16mm, the height is 3.0-6.0 mm, and the battery inner volume is effectively increased by 8-20% within the range. The capacity of the battery can be improved by 8% -20% under the same appearance volume, and electric equipment such as a hearing aid, a wireless TWS Bluetooth earphone, a medical enterogastroscope and a small intelligent wearable device is used as small as possible under the condition that the small-size battery is frequently used. The battery capacity can be improved by 8-20%, which is very beneficial to the application and popularization of the application scene.

The traditional button battery sealing mode is extrusion type semi-sealing, but in the embodiment, the connecting ring 2 is welded with the upper end edge of the shell 1, the electrode plate 3 is connected with the connecting ring 2 in an insulation and sealing manner, the electrode plate 3 and the shell 1 or the connecting ring 2 respectively form two electrodes of the button battery, two electrode surfaces of the traditional button battery can be integrated on one surface for use, the space of electric equipment for fixing the battery is enlarged, and the volume of the electric equipment can be further reduced; the battery has long storage life, and the full sealing can not leak liquid or gas, thereby having good storage performance.

The traditional steel shell button battery is easy to explode to hurt people and damage electric equipment under the condition of thermal abuse of the battery due to structural limitation; the button cell is good in explosion-proof performance, the electrode plates 3 are connected with the connecting rings 2 through the sealing insulating glue 4, when the air pressure in the shell 1 is increased and the shell 1 expands and is heated, the sealing insulating glue 4 softens and releases pressure to achieve the purpose of explosion prevention, and serious accidents caused by expansion explosion or ignition of the button cell are avoided;

the surface of the electrode plate 3 of the button cell has better corrosion resistance after being treated, and the service life of the button cell can be prolonged. The cap and/or the shell 1 are/is processed through the process steps of S1-S5, the battery manufacturing mode can be applied to a high-voltage positive and negative electrode system, the capacity can be improved by 10% -20%, the battery still has good comprehensive performance, and the battery shell cannot be electrically corroded. The voltage of the anode material of the traditional steel shell battery is 4.2V, the gram capacity of the material is 145mAh/g, and the gram capacity of the material adopting high-voltage materials such as 4.35V-4.5V can reach 165-200 mAh/g.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A button battery is characterized by comprising a shell with a bottom surface and a side wall extending around the edge of the bottom surface, wherein a cap is connected to the edge of the upper end of the shell, the cap comprises a connecting ring with a through hole in the middle and an electrode plate which is connected to the surface wall of the connecting ring through sealing insulating glue and used for covering the through hole, and the connecting ring is welded with the edge of the upper end of the shell; an electrode assembly and electrolyte are arranged in the shell, one side of the electrode assembly is electrically connected to the inner wall of the shell through a conductor, and the other side of the electrode assembly is electrically connected with the electrode plate through a conductor.

2. Button cell according to claim 1, characterised in that a stepped recess is provided around the circumference of the connection ring, which recess fits the upper end edge of the housing.

3. Button cell according to claim 1, wherein the connection ring is laser or resistance welded to the upper end edge of the housing.

4. The button cell according to claim 1, wherein the electrode tab is of a disk-like structure and is disposed coaxially with the connection ring, and the electrode tab has a diameter larger than the aperture of the through hole and smaller than the outer diameter of the connection ring.

5. The button cell as claimed in claim 1, wherein the sealing insulating glue is made of modified polyethylene or epoxy resin.

6. The button cell according to claim 1, wherein the aperture of the through hole is larger than 1/3 of the outer diameter of the connection ring.

7. The button cell as claimed in claim 6, wherein the electrode tabs are attached to the outer wall or the inner wall of the connecting ring.

8. The button cell according to claim 1, wherein the electrode tab is a positive electrode, one side of the electrode assembly is electrically connected to an inner wall of the electrode tab by a positive electrode conductor, and the other side of the electrode assembly is electrically connected to an inner wall of the case by a negative electrode conductor.

9. The button cell according to claim 8, wherein the electrode assembly is in 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.

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