WO2023010779A1 - Button cell assembly and electronic device - Google Patents

Abstract

Disclosed in the present invention are a button cell assembly and an electronic device. Since an insulation adhesion middle layer of a cap has an adhesive layer structure, if an electrode line of an electric device is directly welded to the cap, high temperature during the welding will destroy the insulation adhesion middle layer, resulting in ineffective insulation or adhesion; therefore, by means of arranging a wire connection base, the damage to the button cell during use can be reduced to decrease the scrap rate. In addition, a metal elastic structure can apply an inward cap pressure F1 to an electrically conductive outer layer, and a metal housing can provide an outward support force to a welding inner layer, so that under cap pressure F1, the electrically conductive outer layer and the welding inner layer can clamp the insulation adhesion middle layer, which prevents the circumstances of gas generated inside the button cell bursting apart a point of adhesion between the insulation adhesion middle layer and the electrically conductive outer layer or the welding inner layer, and the point of adhesion between the insulation adhesion middle layer and the electrically conductive outer layer or the welding inner layer being separated due to the corrosion of an electrolyte, thereby effectively improving the structural stability of the button cell and further extending the service life of the button cell.

Description

Coin Cell Components and Electronics technical field

The invention relates to the technical field of batteries, in particular to a button battery assembly and electronic equipment.

Background technique

With the rapid development of science, many portable electronic devices are not only becoming thinner, thinner and smaller, but also have more and more complex functions, so the requirements for battery life are also getting higher and higher. Especially in recent years, there has been a whirlwind of sales in the wearable 3C consumer electronics market (such as TWS earphones), which have almost become an indispensable electronic product in modern life.

In the related art, the button battery is usually welded together with the electrode wire of the power consumption circuit in the application scene, so as to maintain the conduction between the button battery and the power consumption circuit. At present, the industry has directly connected the electric circuit to the button battery by welding (for example: spot welding impedance welding, ultrasonic wave, laser spot welding and conduction medium welding type electric welding, etc.). The shell of the button battery is made of stainless steel. It is difficult to weld and fix the stainless steel material and the electrode wire, resulting in low welding efficiency and reducing the installation efficiency of the button battery and electrical equipment. At the same time, during the welding process, it is easy to Cause damage to the shell of the button battery, thereby reducing the service life of the button battery, and even causing the button battery to be scrapped.

Contents of the invention

The main purpose of the present invention is to propose a button battery assembly, aiming at solving the technical problem of how to reduce the damage of the button battery when it is installed in electric equipment.

In order to achieve the above object, the button battery assembly proposed by the present invention includes a wire connection seat and a button battery;

The wire connection seat includes an external connection plate and a conductive ring;

The button battery includes an electric core, a metal casing and a cover shell sealedly connected with the metal casing;

The cover shell includes a conductive outer layer, an insulating bonding middle layer and a welding inner layer, the welding inner layer, the welding inner layer includes an inner welding side part, an inner bonding middle part and an inner through hole part, the insulating bonding The middle layer includes a middle insulating adhesive part and a middle through-hole part, the conductive outer layer includes an outer adhesive part and an outer conductive part, the inner welding side part is welded to the open end of the metal shell, and the middle insulating adhesive The part is made of insulating and anti-electrolyte corrosion-resistant material with a thermal shrinkage rate of 6% or less at 100°C or higher, and then seamlessly bonded with the inner adhesive middle part and the outer adhesive part, and cooled at room temperature The bonding strength between the bottom, the inner bonding middle part, and the outer bonding part is greater than or equal to 0.1N per square millimeter;

One pole of the battery cell is electrically connected to the soldered inner layer, and the other pole of the battery cell is electrically connected to the outer conductive part through the inner through hole part and the middle through hole part;

The metal shell includes a columnar body and an outwardly protruding boss;

The external connection plate includes an insulating body, a metal elastic structure, at least one first electrode metal connection area and at least one second electrode metal connection area;

The insulating body has a conduction surface and an outer contact surface arranged opposite to each other, the conduction surface is provided with the metal elastic structure for electrically contacting the outer conductive part when elastic compression occurs, and the outer contact surface is provided with at least one said first electrode metal connection area and at least one said second electrode metal connection area;

At least one metal connection region of the first electrode is electrically connected to the metal elastic structure;

The conductive ring is connected to the external connection plate and is located on one side of the conduction surface of the external connection plate. The conductive ring extends along the circumference of the external connection plate to form an installation groove surrounded by the external connection plate. The mounting groove is used to accommodate and fix the boss, and is electrically connected to the boss;

At least one metal connection area of the second electrode is electrically connected to the conductive ring.

Optionally, the conductive ring is connected to the external surface, the external surface is provided with a contact point, the contact point is electrically connected to the conductive ring, and the contact point is connected to the metal connection area of the second electrode. Electrical conduction.

Optionally, the first electrode metal connection area and the second electrode metal connection area are made of copper, nickel, tin or an alloy of these elements.

Optionally, the insulating bonding middle layer is made of one or more of PP, PFA, PVDF, PTFE, ETFE and PVC.

Optionally, the button battery is a secondary rechargeable battery.

Optionally, the bonding strength between the middle insulating bonding part, the inner bonding middle part, and the outer bonding part is greater than or equal to 1N per square millimeter and less than or equal to 5N per square millimeter.

Optionally, the metal elastic structure is configured as an annular metal spring.

Optionally, the contact position between the metal elastic structure and the conductive outer layer is located at the position corresponding to the bonding side of the insulating bonding middle layer and the welding inner layer.

Optionally, the outer connection surface is provided with one metal connection area of the first electrode and two metal connection areas of the second electrode, wherein one metal connection area of the second electrode is connected to the metal connection area of the first electrode. The second electrode metal connection region is adjacent to the first electrode metal connection region.

The present invention also proposes an electronic device, which includes an electronic device body containing an electrical device and the above-mentioned button battery assembly, the button battery assembly is located in the electronic device body, and one pole of the electrical device It is electrically connected with the metal connection area of the first electrode; the other electrode is electrically connected with the metal connection area of the second electrode.

The present invention divides the cover shell of the button battery into a conductive outer layer, an insulating bonding middle layer and a welding inner layer, wherein the conductive outer layer is electrically connected to one pole of the battery cell, and the welding inner layer is electrically connected to the other pole of the battery cell. After the inner welding side part of the welding inner layer is welded to the opening end of the metal shell, the packaging of the electric core can be realized.

Since the welding inner layer and the conductive outer layer are insulated through the insulating bonding middle layer, the metal shell will also be insulated from the conductive outer layer, thereby preventing the two electrodes of the cell from conducting and short circuiting each other; The layer has been pre-insulated, so when the cover shell is packaged with the metal shell, only the inner layer and the metal shell need to be welded, and there is no need to install an insulating film, which can simplify the battery packaging process and improve packaging efficiency.

The insulating body and the conductive ring of the wire connection seat are surrounded to form a mounting groove for the fixed installation of the boss of the button battery. The ring abuts against each other, so that the first electrode metal connection area on the outer contact surface conducts with one electrode of the button battery, and the second electrode metal connection area conducts with the other electrode of the button battery.

The first electrode metal connection area and the second electrode metal connection area are used for welding or abutting contact of the positive and negative electrode wires of the electrical equipment, and the electrode wires of the electrical equipment are connected to the first electrode metal connection area and the second electrode metal After the area is welded, it can conduct with the electrode of the button battery, so as to realize the electrical conduction between the electrical equipment and the button battery.

Since the insulating and bonding middle layer of the cover shell is a glue layer structure, if the electrode wires of the electrical equipment are directly welded to the cover shell, the high temperature during the welding process will destroy the insulating and bonding middle layer, resulting in ineffective insulation or bonding. Therefore, by setting the wire The connection seat can reduce the damage of the button battery application to reduce the scrap rate; in addition, the metal elastic structure can exert an inward cover shell pressure F1 on the conductive outer layer, and the metal shell will produce outward support on the welded inner layer Therefore, the pressure F1 of the cover will make the conductive outer layer and the welding inner layer clamp the insulating bonding middle layer, so as to prevent the gas generated inside the button battery from breaking away the bonding between the insulating bonding middle layer and the conductive outer layer or the welding inner layer , Also avoid the separation of the bonding between the insulating bonding middle layer and the conductive outer layer or the welding inner layer due to electrolyte corrosion, which can effectively improve the structural stability of the button battery and further extend the service life of the button battery.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

Fig. 1 is the structural representation of an embodiment of button cell assembly of the present invention;

Fig. 2 is a schematic cross-sectional view of an embodiment of the button battery assembly of the present invention;

Fig. 3 is a schematic structural view of an embodiment of the wire connection seat in the present invention;

Fig. 4 is a structural schematic view of another embodiment of the wire connecting seat in the present invention;

Fig. 5 is the structural representation of an embodiment of button cell in the present invention;

FIG. 6 is a schematic cross-sectional view of an embodiment of a button battery in the present invention.

Explanation of reference numbers:

label	name	label	name	label		name
10	wire connector	20	Button Battery	11	External board
12	Conductive ring	twenty one	Batteries	twenty two	metal shell
twenty three	Cover shell	twenty four	Conductive outer layer	25	Insulation bonding middle layer
26	Weld inner layer	261	Inner Weld Side	262	inner bonding middle
263	Inner through hole	251	Insulation bonding part	252	Through Hole
241	Outer bonding	242	Outer conductive part	221	columnar body
222	Boss	13	Insulation body	14	metal elastic structure
15	first electrode metal connection	16	Second electrode metal connection	131	conduction surface

the	district	the	district	the	the
132	Outer surface	133	Contact point	the	the

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the meaning of "and/or" appearing in the whole text includes three parallel schemes, taking "A and/or B as an example", including scheme A, scheme B, or schemes satisfying both A and B. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

The present invention provides a button battery assembly, which is used for being installed in the main body of electronic equipment containing electric devices to provide electric energy to the electric devices.

In the embodiment of the present invention, as shown in FIGS. 1 to 6 , the button battery assembly includes a wire connection base 10 and a button battery 20;

The wire connection base 10 includes an external connection plate 11 and a conductive ring 12;

Described button battery 20 comprises electric core 21, metal shell 22 and the cover shell 23 that is connected with described metal shell 22 sealingly;

The cover shell 23 includes a conductive outer layer 24, an insulating bonding middle layer 25 and a welding inner layer 26, the welding inner layer 26, and the welding inner layer 26 includes an inner welding side part 261, an inner bonding middle part 262 and an inner through hole. The hole part 263, the insulating bonding middle layer 25 includes the middle insulating bonding part 251 and the through hole part 252, the conductive outer layer 24 includes the outer bonding part 241 and the outer conductive part 242, and the inner welding side part 261 Welded with the open end of the metal shell 22, the middle insulating bonding part 251 is melted by an insulating and electrolyte-resistant material with a thermal shrinkage rate of 6% or less at a temperature of 100°C or higher, and then bonded to the inner The middle part 262 and the outer bonding part 241 are seamlessly bonded, and the bonding strength between the inner bonding middle part 262 and the outer bonding part 241 is greater than or equal to 0.1 N per square millimeter at room temperature ;

One pole of the battery cell 21 is electrically connected to the welding inner layer 26, and the other pole of the battery cell 21 is electrically connected to the outer conductive part 242 through the inner through hole part 263 and the middle through hole part 252. ;

The metal shell 22 includes a columnar body 221 and an outwardly protruding boss 222;

The external connection plate 11 includes an insulating body 13, a metal elastic structure 14, at least one first electrode metal connection area 15 and at least one second electrode metal connection area 16;

The insulating body 13 has a conduction surface 131 and an outer contact surface 132 disposed opposite to each other. The conduction surface 131 is provided with the metal elastic structure 14 for electrically contacting the outer conductive part 242 when elastic compression occurs. , the external surface 132 is provided with at least one metal connection region 15 of the first electrode and at least one metal connection region 16 of the second electrode;

At least one of the first electrode metal connection regions 15 is electrically connected to the metal elastic structure 14;

The conductive ring 12 is connected to the external connection plate 11 and is located on the side of the conducting surface 131 of the external connection plate 11. Enclosing and forming a mounting groove, the mounting groove is used to accommodate and fix the boss 222, and electrically conduct with the boss 222;

At least one of the second electrode metal connection regions 16 is electrically connected to the conductive ring 12 .

The metal shell 22 can be made of stainless steel plate, and the opening of the metal shell 22 faces upwards to accommodate the battery cell 21 and the electrolyte; wherein, the boss 222 is arranged at the opening end of the columnar body 221 and protrudes from the outer periphery of the columnar body 221 wall, and the boss 222 extends along the circumference of the columnar body 221 .

The conductive outer layer 24 and the welding inner layer 26 of the cover shell 23 can be made of stainless steel plates, wherein the outer conductive part 242 of the conductive outer layer 24 will pass through the middle through hole part 252 and the inner through hole part 263 towards the inside of the battery case, and use to be connected to one of the electrodes of the battery cell 21 ; the welding inner layer 26 is connected to the other electrode of the battery cell 21 by being connected to the metal shell 22 . Owing to there is the insulating bonding middle layer 25 between the welding inner layer 26 and the conductive outer layer 24, therefore, the welding inner layer 26 is insulated from the conductive outer layer 24, so that the metal shell 22 and the conductive outer layer 24 can be insulated from each other to prevent electric shock. The two electrodes of the core 21 are connected to each other, thus, the conductive outer layer 24 and the metal shell 22 of the cover shell 23 can be respectively formed into two output electrodes of the button battery 20, and the two output electrodes can be prevented from being connected to each other. short circuit.

It can be understood that the inner surface of the outer conductive part 242 will pass through the middle through hole part 252 and the inner through hole part 263 towards the inside of the metal shell 22, so as to contact the electrodes of the power supply core 21; connect. The outer conductive part 242 may be located on the top of the middle through hole part 252 and the inner through hole part 263, or may be recessed toward the inside of the metal shell 22, and pass through the middle through hole part 252 and the inner through hole part 263 in sequence. There is no seat restriction, it only needs to satisfy that the outer conductive part 242 can be in contact with the electrode of the battery cell 21 .

In the prior art, the shell of the button battery 20 adopts the upper and lower shells, and the middle is a plastic insulating ring. For the side wall of the battery shell, it has a three-layer structure; while the metal shell 22 side wall of the present application can only be one Layer, in the case of the same size casing, the metal casing 22 of the present application increases the available space inside, which is beneficial to increase the capacity of the entire battery.

The inner welding side portion 261 is the position where the welding inner layer 26 is used for welding with the metal shell 22 , and the inner welding side portion 261 is disposed on the peripheral wall of the welding inner layer 26 . The inner through hole portion 263 is the position where the inner layer 26 is opened for welding, and the inner adhesive middle portion 262 is used for bonding with the insulating adhesive middle layer 25 . Wherein, the inner welding side portion 261 is welded to the metal shell 22 , which can not only realize the mutual fixing of the cover shell 23 and the metal shell 22 , but also realize the electrical conduction between the welded inner layer 26 and the metal shell 22 . The middle through hole portion 252 of the insulating bonding middle layer 25 corresponds to the inner through hole portion 263 of the welding inner layer 26, so that the outer conductive portion 242 of the conductive outer layer 24 can pass through the middle through hole portion 252 and the inner through hole portion 263 towards the metal shell 22 inside. The middle through-hole portion 252 and the inner through-hole portion 263 can be opened in the middle of the cover shell 23 so that the outer conductive portion 242 can maintain a sufficient distance from each position in the circumferential direction of the columnar body 221 .

The electrodes of the battery cell 21 may directly contact the outer conductive portion 242 of the conductive outer layer 24 . The top surface and the bottom surface of the middle insulating bonding portion 251 are bonded to the outer bonding portion 241 and the inner bonding middle portion 262 respectively, so as to realize the insulating connection between the welding inner layer 26 and the conductive outer layer 24 . The welding inner layer 26 is welded and sealed with the metal shell 22 , and the conductive outer layer 24 and the welding inner layer 26 are seamlessly bonded through the insulating bonding middle layer 25 , so that the metal shell 22 can be closed by the cover shell 23 . Wherein, when the welding inner layer 26 is connected to the metal shell 22, the welding inner layer 26 and the conductive outer layer 24 have been insulated and connected in advance, so there is no need to additionally provide an insulating film.

The insulating bonding middle layer 25 is made of materials with insulating properties and anti-electrolyte corrosion, and its heat shrinkage rate is less than 6% when it is greater than or equal to 100 ° C. The heat shrinkage rate refers to the thermoplastic material due to its inherent thermal expansion rate. That is to say, when the temperature is greater than or equal to 100°C, the volume change of the insulating and bonding middle layer 25 does not exceed 6% of the original volume, so that the insulating and bonding middle layer 25 can be fully melted and bonded with the conductive outer layer 24 It is fully connected with the welding inner layer 26 to ensure the bonding effect.

The bonding strength between the insulating bonding middle layer 25 and the outer bonding part 241 and the inner bonding middle part 262 is greater than or equal to 0.1N per square millimeter at normal cooling temperature, which can ensure that the insulating bonding middle layer 25 and the conductive outer layer 24 and the welding inner layer The bonding stability of the layer 26; specifically, the bonding strength between the middle insulating bonding part 251 and the outer bonding part 241 and the inner bonding middle part 262 is greater than or equal to 1N per square millimeter at normal cooling temperature, And be less than or equal to 5.0N/mm2, so as to prevent the internal stress of the cover shell 23 from being too high, thereby avoiding the damage of the cover shell 23 due to internal force during subsequent processing or use.

The present invention divides the cover shell 23 of the button battery 20 into a conductive outer layer 24, an insulating and adhesive middle layer 25 and a welding inner layer 26, wherein the conductive outer layer 24 is electrically connected to one pole of the battery cell 21, and the welding inner layer 26 is connected to the electric core 21. The other pole of the core 21 is electrically connected, and after the inner welding side portion 261 of the inner layer 26 is welded to the open end of the metal shell 22 , the packaging of the battery core 21 can be realized.

Because the welding inner layer 26 and the conductive outer layer 24 are insulated by the insulating bonding middle layer 25, the metal shell 22 will also be insulated from the conductive outer layer 24, thereby preventing the two electrodes of the electric core 21 from conducting and shorting each other; because the cover shell 23 The conductive outer layer 24 and the welding inner layer 26 have been insulated in advance, so when the cover shell 23 is packaged with the metal shell 22, only the welding inner layer 26 and the metal shell 22 need to be welded, and no insulating film is required, which can simplify The packaging process of the battery improves the packaging efficiency.

Compared with the prior art, the metal shell 22 and the cover shell 23 of the present application are sealed by welding, which improves the sealing and stability well, instead of relying on physical force extrusion between the shells for sealing, and Since the cover shell 23 is prepared in advance, the insulation is carried out through the middle insulating adhesive part 251, which can improve the insulation, and at the same time, it can play a protective role under certain conditions.

Further, the cover shell 23 of the button battery 20 in the present application adopts a three-layer structure, and the stability and reliability of the structure are strengthened. Since the middle insulating bonding part 251 is between the two layers of stainless steel, it is waterproof and anti-electrolyte corrosion. The properties are all very strong, and the external contact area between the middle insulating bonding portion 251 and the metal shell 22 is very small, which can effectively prevent external moisture from entering the metal shell 22; while the contact area is small, the middle insulating bonding portion 251 The length of the path between the outside and the inside of the metal casing 22 is relatively long, which further avoids the influence of external moisture on the battery cell 21 and the electrolyte inside the metal casing 22 .

Similarly, for the inside of the button battery 20, the middle insulating adhesive portion 251 can only contact the electrolyte solution in the button battery 20 at the edge of the middle through hole portion 252, which can effectively reduce the contact between the electrolyte solution and the middle insulating adhesive portion 251. contact area to effectively protect the middle insulating bonding portion 251 and avoid the influence of the electrolyte on the middle insulating bonding portion 251 such as softening and corrosion, thus effectively improving the service life of the battery. Furthermore, the path of the middle insulating bonding portion 251 from the inside of the button battery 20 to the outside of the button battery 20 is also longer, which can further improve the service life of the battery.

The insulating body 13 can be a circular plate or a square plate, which is not specifically limited. The first electrode metal connection area 15 is used for the electrode wire welding activity of the electrical equipment to interfere with the contact electrical conduction. The electrode wire of the electrical equipment can be a positive pole line or a negative pole line, which is not limited here; for specific examples, When the first electrode metal connection area 15 is electrically connected to the positive pole of the button battery 20, the positive line of the power supply equipment is welded or resists the electrical connection with it; when the first electrode metal connection area 15 is electrically connected to the negative electrode of the button battery , the negative wire of the power supply equipment is welded or resists contact with it for electrical conduction.

The shape of the conductive ring 12 corresponds to the shape of the insulating body 13, such as a circular ring or a square ring, so that the installation groove formed by the conductive ring 12 and the insulating body 13 is more regular. For example, the insulating body 13 is set in a circular shape plate, and the conductive ring 12 is set as a circular ring, so that the mounting groove is adapted to the round button battery 20 . The installation groove can be used to accommodate the button battery 20 as a whole, or only the end of the button battery 20. There is no limitation here, as long as the button battery 20 is loaded into the installation groove, the cover shell 23 is opposite to the insulating body 13. Can. After the cover shell 23 is installed in the installation groove, the conductive outer layer 24 abuts against the metal elastic structure 14 to indirectly contact with the conduction surface 131; Pass.

The purpose of the conduction surface 131 being in contact with the button battery 20 is to better fix the button battery 20. Therefore, the conduction surface 131 and the button battery 20 can be in direct contact, or indirectly, or not in contact, as long as they can be stably It is enough to confirm that the button battery 20 can be well and firmly fixed in the installation slot. Preferably, the conduction surface 131 is insulated, and after the metal elastic structure 14 is in contact with the conductive outer layer 24 , electrical conduction is formed with the first electrode metal connection region 15 through the internal wiring of the insulating body 13 .

The second electrode metal connection area 16 is used for welding or abutting contact electrical conduction of the electrode wires of the electrical equipment. It can be a positive wire or a negative wire, which is not limited here; The connection area 16 is electrically connected to the positive pole of the button battery 20, and the positive wire of the power supply equipment is welded or electrically connected with it; when the second electrode metal connection area 16 is electrically connected to the negative pole of the button battery 20, the power supply equipment The negative wire is welded or resists contact with it for electrical conduction.

After the button battery 20 is loaded into the installation groove, the positive pole abuts against the metal elastic structure 14 through the conductive outer layer 24, and the negative pole abuts against the conductive ring 12 through the metal shell 22, that is, the positive pole of the button battery 20 can be connected to the first pole on the insulating body 13. The electrode metal connection area 15 is electrically connected, so that the positive wire welded to the first electrode metal connection area 15 can be electrically connected to the positive electrode of the button battery 20; the negative electrode of the button battery 20 can be connected to the second electrode metal connection area 16 on the insulating body 13 Electrical conduction, so that the negative electrode wire welded to the second electrode metal connection area 16 can be electrically conductive with the negative electrode of the button battery 20, so that the button battery 20 and the electrical equipment can form a current loop through the battery wire connection seat 10.

Since both the positive and negative wires of the electrical equipment can be welded to the insulating body 13, the difficulty of connecting the electrical equipment to the button battery 20 can be further reduced, and the connection efficiency and connection strength can be improved. Compared with traditional welding on the two end faces of the button battery 20, this application can directly weld on one side, especially in one step during the automatic welding process, which improves the welding efficiency.

Further, the first electrode metal connection area 15 and the second electrode metal connection area 16 on the insulating body 13 are made of copper, nickel, tin or alloys of these elements. The first electrode metal connection area 15 and the second electrode metal connection area 16 are used for electrode wire welding and conduction, and copper, nickel, and tin can reduce connection difficulty during welding to further improve welding efficiency.

In addition, when replacing the button battery 20 , there is no need to operate the electrode wires, and it is only necessary to disassemble the button battery 20 , which further improves the replacement efficiency of the button battery 20 .

Furthermore, since the insulating and bonding middle layer 25 of the cover shell 23 is an adhesive layer structure, if the electrode wires of the electrical equipment are directly welded to the cover shell 23, the high temperature during the welding process will destroy the insulating and bonding middle layer 25, resulting in ineffective insulation or bonding. Therefore, by setting the wire connection base 10, the damage of the button battery 20 during application can be reduced, so as to reduce the scrap rate.

In addition, the metal elastic structure 14 can also exert an inward pressure F1 of the cover shell 23 on the conductive outer layer 24, and the metal shell 22 will produce an outward support force on the welded inner layer 26, so the pressure F1 of the cover shell 23 will make the conductive The outer layer 24 and the welding inner layer 26 sandwich the insulating and bonding middle layer 25, so as to prevent the gas generated inside the button battery 20 from breaking away the joint between the insulating and bonding middle layer 25 and the conductive outer layer 24 or the welding inner layer 26, and also avoid insulating The bond between the bonding middle layer 25 and the conductive outer layer 24 or the welding inner layer 26 is separated due to electrolyte corrosion, thereby effectively improving the structural stability of the button battery 20 and further prolonging the service life of the button battery 20 .

In one embodiment, as shown in FIGS. 1 and 3 , the conductive ring 12 is connected to the outer surface 132, and the outer surface 132 is provided with a contact point 133, and the contact point 133 is connected to the conductive ring 12. and the contact point 133 is electrically connected to the second electrode metal connection region 16 .

Two opposite positions on the circumferential direction of the conductive ring 12 are respectively protruded with pinch plates, and the two pinch plates are fastened to the external surface 132 . The pinch plate is used to realize the fixed connection between the conductive ring 12 and the insulating body 13 , and the pinch plate and the conductive ring 12 can be integrally injection-molded to improve structural strength and reduce processing difficulty. The two gussets are connected to two relative positions in the circumferential direction of the conductive ring 12, which can increase the area of the connection part between the conductive ring 12 and the insulating body 13 and the external contact surface 132, so as to improve the connection strength.

The pinch plate not only plays the role of supporting the fixed connection, but also transfers the electrical conduction formed by the contact between the conductive ring 12 and the boss 222 of the button battery 20 to the contact point 133, so as to realize the connection between one pole of the button battery 20 and the second pole of the button battery 20. The electrical conduction of the electrode metal connection region 16 can cooperate to improve the conduction stability. The connection between the gusset plate and the contact point 133 is welding to reduce connection difficulty, effectively reduce contact resistance, and improve connection strength.

In one embodiment, the material of the insulating adhesive middle layer 25 is PP (polypropylene), PFA (copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene), PVDF (polyvinylidene fluoride) ), PTFE (polytetrafluoroethylene), ETFE (ethylene-tetrafluoroethylene copolymer), PVC (polyvinyl chloride) in one or more.

Polyethylene (PE for short) is a thermoplastic resin obtained by polymerization of ethylene. In industry, it also includes copolymers of ethylene and a small amount of α-olefins. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance, good chemical stability, and can withstand most acids and alkalis. Insoluble in common solvents at room temperature, low water absorption, excellent electrical insulation.

Polypropylene is a polymer formed by addition polymerization of propylene (Polypropylene, referred to as PP). It is a white waxy material with a transparent and light appearance, flammable, a melting point of 165°C, and softens at about 155°C. The operating temperature range is -30°C. ~140°C. Modified PP is modified on the basis of PP. For example, the modified PP used in this embodiment is a metal-friendly modified polypropylene resin (Metal Adhesive Polypropylene, hereinafter referred to as metal-friendly modified PP), which can be made in the PP On the basis of chemical modification methods such as copolymerization, grafting or cross-linking, the surface has metalophilic properties, so that it can be fused with the metal surface by heating to form a good bonding seal.

The Chinese name of PFA is tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (also known as perfluoroalkylate, soluble polytetrafluoroethylene), which is a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene. of copolymers. The melt adhesion is enhanced, the melt viscosity is reduced, and the performance is unchanged compared with PTFE. This kind of resin can be directly processed into products by ordinary thermoplastic molding methods. PFA has a long-term service temperature of -200°C to 260°C, has excellent chemical corrosion resistance, is corrosion-resistant to all chemicals, has the lowest friction coefficient among plastics, and has good electrical properties, and its electrical insulation is not affected by temperature. , known as the "King of Plastics". PFA chemical resistance is similar to polytetrafluoroethylene, better than vinylidene fluoride, creep resistance and compressive strength are better than polytetrafluoroethylene, high tensile strength, elongation can reach 100-300%; dielectric Good resistance, excellent radiation resistance; high flame retardancy; non-toxic, physiologically inert, and can be implanted in the human body.

In one embodiment, the button battery 20 is a secondary rechargeable battery, so as to achieve repeated use through charging, thereby increasing the service life of the button battery 20 . When the button battery 20 needs to be charged, it is only necessary to remove the button battery 20 from the battery wire connecting seat 10 , thereby reducing the difficulty of reusing the button battery 2020 and increasing the reusability.

In one embodiment, as shown in FIG. 2 and FIG. 3 , the metal elastic structure 14 is configured as an annular metal spring. The annular metal spring can increase the contact area with the conductive outer layer 24, thereby improving the contact stability and ensuring the stability of electrical conduction.

In addition, the pressure F1 produced by the ring-shaped metal elasticity on the conductive outer layer 24 can act on the conductive outer layer 24 along the ring, so that multiple positions of the conductive outer layer 24 can be pressed and fixed on the insulating adhesive middle layer 25 to increase the compression. On the other hand, the structural stability of the button battery 20 is further improved.

In one embodiment, the contact position between the metal elastic structure 14 and the conductive outer layer 24 is located at a position corresponding to the side where the insulating adhesive middle layer 25 and the welding inner layer 26 are bonded.

The insulating bonding middle layer 25 will be exposed to the electrolyte at the periphery of the through hole 252, that is, the electrolyte is easy to corrode the insulating bonding middle layer 25 from the middle through hole 252, so that the insulating bonding middle layer 25 and the conductive outer layer 24 The bond is separated by corrosion.

The metal elastic structure 14 is close to the periphery of the middle through hole portion 252, so that the pressure generated by the metal elastic structure 14 on the conductive outer layer 24 can accurately act on the bonding seam between the conductive outer layer 24 and the insulating bonding middle layer 25 to prevent insulation. The joint between the adhesive middle layer 25 and the conductive outer layer 24 is corroded and separated, thereby improving the structural stability of the cover shell 23 in the electrolyte.

In one embodiment, as shown in FIG. 1 and FIG. 3 , the outer connection surface 132 is provided with one first electrode metal connection region 15 and two second electrode metal connection regions 16, one of which is the The second electrode metal connection region 16 is adjacent to the first electrode metal connection region 15 , and another second electrode metal connection region 16 is disposed on a side opposite to the first electrode metal connection region 15 .

It can be understood as setting one positive metal connection area and two negative metal connection areas, or two positive metal connection areas and one negative metal connection area, wherein one positive metal connection area and one negative metal connection area are arranged adjacent to the same side, Another positive metal connection area or negative metal connection area is set at the opposite position on the other side. In the specific use process, if the external electrical equipment is welded, you can preferably choose to use the positive metal connection area adjacent to the same side and The negative metal connection area can facilitate welding; if it is a way of resisting electrical conduction, it is preferable to use the positive and negative metal connecting areas on opposite sides to facilitate the uniformity of the resistance to electrical conduction and improve stability. sex.

The present invention also proposes an electrical device, which includes an electronic device body containing an electrical device and a button battery assembly. The specific structure of the button battery assembly refers to the above-mentioned embodiments. Since this electrical device adopts all the above-mentioned implementations All the technical solutions of the above-mentioned embodiments, therefore at least have all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be repeated here. Wherein, the button battery assembly is located in the main body of the electronic equipment, and one pole of the electrical device is electrically connected to the first electrode metal connection area 15; the other pole is electrically connected to the second electrode metal connection area 15. 16 is electrically conductive.

The above descriptions are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect Application in other related technical fields is included in the patent protection scope of the present invention.

Claims (10)

1. A button battery assembly, characterized in that it includes a wire connection seat and a button battery;

   The wire connection seat includes an external connection plate and a conductive ring;

   The button battery includes an electric core, a metal casing and a cover shell sealedly connected with the metal casing;

   The cover shell includes a conductive outer layer, an insulating bonding middle layer and a welding inner layer, the welding inner layer includes an inner welding side part, an inner bonding middle part and an inner through hole part, and the insulating bonding middle layer includes a middle insulating bonding part and a through-hole part, the conductive outer layer includes an outer bonding part and an outer conductive part, the inner welding side part is welded to the open end of the metal shell, and the middle insulating bonding part is formed at a value greater than or equal to 100 After melting the insulating and anti-electrolyte corrosion material with a thermal shrinkage rate of 6% or less at ℃, it is seamlessly bonded to the middle part of the inner bonding part and the outer bonding part, and is bonded to the inner bonding part at room temperature under cooling. The bonding strength between the middle part and the outer bonding part is greater than or equal to 0.1N per square millimeter;

   One pole of the battery cell is electrically connected to the soldered inner layer, and the other pole of the battery cell is electrically connected to the outer conductive part through the inner through hole part and the middle through hole part;

   The metal shell includes a columnar body and an outwardly protruding boss;

   The external connection plate includes an insulating body, a metal elastic structure, at least one first electrode metal connection area and at least one second electrode metal connection area;

   The insulating body has a conduction surface and an outer contact surface arranged opposite to each other, the conduction surface is provided with the metal elastic structure for electrically contacting the outer conductive part when elastic compression occurs, and the outer contact surface is provided with at least one said first electrode metal connection area and at least one said second electrode metal connection area;

   At least one metal connection region of the first electrode is electrically connected to the metal elastic structure;

   The conductive ring is connected to the external connection plate and is located on one side of the conduction surface of the external connection plate. The conductive ring extends along the circumference of the external connection plate to form an installation groove surrounded by the external connection plate. The mounting groove is used to accommodate and fix the boss, and is electrically connected to the boss;

   At least one metal connection area of the second electrode is electrically connected to the conductive ring.
2. The button battery assembly according to claim 1, wherein the conductive ring is connected to the external surface, the external surface is provided with a contact point, and the contact point is electrically connected to the conductive ring, and the The contact point is electrically connected to the metal connection area of the second electrode.
3. The button cell assembly according to claim 1, wherein the material of the first electrode metal connection area and the second electrode metal connection area is copper, nickel, tin or an alloy of these elements.
4. The button cell assembly according to claim 1, wherein the material of the insulating adhesive middle layer is one or more of PP, PFA, PVDF, PTFE, ETFE and PVC.
5. The button battery assembly according to claim 1, wherein the button battery is a secondary rechargeable battery.
6. The button battery assembly according to any one of claims 1 to 5, wherein the bonding strength between the middle insulating bonding part, the inner bonding middle part, and the outer bonding part is greater than or equal to 1N per square millimeter, and less than or equal to 5N per square millimeter.
7. The button cell assembly according to any one of claims 1 to 5, wherein the metal elastic structure is configured as an annular metal spring.
8. The button battery assembly according to any one of claims 1 to 5, wherein the contact position between the metal elastic structure and the conductive outer layer is located at the edge of the bonding place between the insulating bonding middle layer and the welding inner layer The corresponding position on the side.
9. The button battery assembly according to any one of claims 1 to 5, wherein the outer surface is provided with one metal connection area of the first electrode and two metal connection areas of the second electrode, one of which is The second electrode metal connection area is adjacent to the first electrode metal connection area, and another second electrode metal connection area is disposed on a side opposite to the first electrode metal connection area.
10. An electronic device, characterized in that it includes an electronic device body containing electrical devices and a button battery assembly according to any one of claims 1 to 9, the button battery assembly is located in the electronic device body, and the One pole of the electrical device is electrically connected to the metal connection area of the first electrode; the other pole is electrically connected to the metal connection area of the second electrode.

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