Button cell and electronic device

The present disclosure provides a button cell and an electronic device. In the button cell, a conductive member covers an opening of a top cover, and the top cover is connected to the conductive member. A cell is placed in an accommodating cavity of a bottom shell. A first tab is welded to an inner bottom wall of the bottom shell, and then the top cover having the conductive member is connected to the bottom shell in a sealed manner, with a second tab on the cell being electrically connected to the conductive member. Finally, an electrolyte solution is injected into the accommodating cavity. After the electrolyte solution is injected, a sealing member covers the liquid injection port, and the sealing member is connected to the liquid injection port in a sealed manner.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202010496417.7, filed on Jun. 3, 2020, and Chinese Patent Application No. 202021331670.9, filed on Jul. 8, 2020, both of which are hereby incorporated by reference in their entireties.

TECHNICAL FIELD

The present disclosure relates to the field of battery technology and, in particular, to a button cell and an electronic device.

BACKGROUND

A button cell refers to a battery with shape and size similar to a button. Generally speaking, it is larger in diameter and smaller in thickness. Because of its small size, the button cell has been widely used in various microelectronic devices, such as those in the field of wearable electronic devices and medical products.

Since the interior of a button cell is a closed space, the sealing performance is extremely important for the button cell. However, the button cell in the prior art has inferior sealing performance.

SUMMARY

In view of the foregoing problems, embodiments of the present disclosure provide a button cell and an electronic device with improved sealing performance.

In order to achieve the above objectives, the embodiments of the present disclosure provide following technical solutions.

A first aspect of the embodiments of the present disclosure provides a button cell, including a case, a cell and a conductive member, where the case includes a bottom shell, and a top cover connected to the bottom shell in a sealed manner, the bottom shell and the top cover enveloping and forming an accommodating cavity for accommodating the cell; the top cover is provided with an opening in communication with the accommodating cavity, the conductive member covers the opening, and is connected to the top cover through a sealant ring in an insulated and sealed manner; the conductive member is further provided with a liquid injection port for injecting an electrolyte solution into the accommodating cavity, the liquid injection port being covered with a sealing member which is connected to the liquid injection port in a sealed manner; and the cell has a first tab and a second tab, the first tab being electrically connected to the case, and the second tab being electrically connected to the conductive member.

In an alternative embodiment, the conductive member is provided with an extension part which passes through the opening and extends into the accommodating cavity; and the second tab is electrically connected to an end of the extension part facing the accommodating cavity.

In an alternative embodiment, a first glue-overflow groove is formed between the extension part and an edge of the opening, and the width of the first glue-overflow groove along a radial direction of the cell is 0.1-3 mm.

In an alternative embodiment, the sealing member is a sealing nail; a first counter bore is arranged on an end of the liquid injection port facing away from the accommodating cavity, and the diameter of the first counter bore is greater than that of the liquid injection port; the first counter bore is in communication with the liquid injection port, and the sealing nail is located in the first counter bore and is connected to the first counter bore in a sealed manner.

In an alternative embodiment, the sealing nail is welded to the first counter bore.

In an alternative embodiment, a cell cavity is formed in the center of the cell, and the cell cavity, the case and the liquid injection port are arranged coaxially.

In an alternative embodiment, a second counter bore is arranged on the top cover, the conductive member is located in the second counter bore, with an upper surface of the conductive member being flush with an upper surface of the top cover.

In an alternative embodiment, a second glue-overflow groove is formed between an outer edge of the conductive member and a side wall of the second counter bore, and the width of the second glue-overflow groove along the radial direction of the cell is 0.1-3 mm.

In an alternative embodiment, the button cell further includes an abutment member located in, and arranged coaxially with, the cell cavity, with an end of the abutment member abutting against the first tab to press the first tab against an inner bottom wall of the bottom shell.

In an alternative embodiment, a first insulating rubber layer is arranged between a lower end surface of the cell and an inner bottom wall of the case, and the first insulating rubber layer is provided with a first through hole arranged coaxially with the cell cavity.

In an alternative embodiment, the diameter of the first through hole is greater than that of the cell cavity.

In an alternative embodiment, a second insulating rubber layer is arranged between an upper end surface of the cell and an inner top wall of the case, and the second insulating rubber layer is provided with a second through hole arranged coaxially with the cell cavity.

In an alternative embodiment, the diameter of the second through hole is greater than that of the cell cavity.

In an alternative embodiment, a third insulating rubber layer is arranged between the second tab and the top cover.

In an alternative embodiment, the third insulating rubber layer is attached to an inner wall of the top cover, and a circumference of the third insulating rubber layer is smaller than a circumference of the top cover along the radial direction of the cell;

the third insulating rubber layer is further provided with a third through hole arranged coaxially with the cell cavity, a diameter of the third through hole is less than the radial dimension of the opening.

In an alternative embodiment, the third insulating rubber layer is attached to a side of the second tab closer to the top cover, and a distance between an outer edge of the third insulating rubber layer and an axis of the cell is less than a distance between the opening and the axis of the cell along the radial direction of the cell.

In an alternative embodiment, a concave weld mark is arranged on a surface of the first tab facing the cell, and the weld mark is located in an area corresponding to the first through hole and the cell cavity.

In an alternative embodiment, an area on an outer bottom wall of the bottom shell corresponding to the weld mark is a smooth flat surface or a rounded surface.

In an alternative embodiment, a depth of the weld mark is 20-200 μm; or, a height of the weld bump formed after welding is 10-120 μm.

A second aspect of the embodiments of the present disclosure further provides an electronic device including an electronic device body and the button cell provided by the first aspect, where the button cell supplies electrical energy to the electronic device body.

The button cell and the electronic device provided by the embodiments of the present disclosure have following advantages:

In the button cell provided by the embodiments of the present disclosure, a conductive member covers an opening of a top cover, the top cover being connected to the conductive member through a sealant ring in an insulated and sealed manner. A cell is placed in an accommodating cavity of a bottom shell, with a first tab on the cell being welded to an inner bottom wall of the bottom shell. Then, the top cover having the conductive member is connected to the bottom shell in a sealed manner, with a second tab on the cell being electrically connected to the conductive member. Finally, an electrolyte solution is injected into the accommodating cavity through a liquid injection port of the conductive member. After the electrolyte solution is injected, a sealing member covers the liquid injection port, and the sealing member is connected to the liquid injection port in a sealed manner, thereby improving sealing performance of the button cell.

In addition to the technical problems solved by the embodiments of the present disclosure, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, as described above, other technical problems that can be solved by the button cell and the electronic device provided by the embodiments of the present disclosure, other technical features included in the technical solutions, and the beneficial effects brought about by the technical features will be illustrated in further detail in relation to the specific implementations.

DESCRIPTION OF REFERENCE NUMBERS

DETAILED DESCRIPTION

Since the interior of a button cell is a closed space, the sealing performance is extremely important for the button cell. However, in the prior art, firstly, an electrolyte solution is injected into an accommodating cavity where a cell is placed, and then a conductive member is configured to pass through an opening of a case, so that the conductive member is riveted to the opening, and an insulated sealant ring is provided between the conductive member and the opening. However, when the conductive member is being riveted to the opening, the case will be shocked, and the electrolyte solution in the accommodating cavity will splash to the sealant ring, causing partial failure of the sealant ring, resulting in inferior sealing performance.

In order to solve the above problems, in the button cell provided by the embodiments of the present disclosure, a conductive member covers an opening of a top cover, such that the top cover is connected to the conductive member through a sealant ring in an insulated and sealed manner. A cell is arranged in an accommodating cavity of a bottom shell, with a first tab on the cell being welded to an inner bottom wall of the bottom shell. Then, the top cover having the conductive member is connected to the bottom shell in a sealed manner, with a second tab on the cell being electrically connected to the conductive member. An electrolyte solution is injected into the accommodating cavity through a liquid injection port of the conductive member. After the electrolyte solution is injected, the liquid injection port is covered by a sealing member, and the sealing member is connected to the liquid injection port in a sealed manner by bonding or welding, thereby improving sealing performance of the button cell.

In order to make the above objectives, technical features and advantages of the embodiments of the present disclosure more explicit and understandable, the technical solutions in the embodiments of the present disclosure are illustrated clearly and completely in combination with the accompanying drawings in the embodiments of the present disclosure hereinafter. Obviously, the embodiments described are only a part of embodiments of the present disclosure, and are not all of the embodiments thereof. Based on the embodiments of the present disclosure, all the other embodiments obtained by those skilled in the art without creative works are within the protection scope of the present disclosure.

Example I

As shown inFIG.1andFIG.2, a button cell provided by the examples of the present disclosure includes: a case10, a cell20arranged in an accommodating cavity1011of the case10, and a conductive member30which is arranged on the case10and connected to the case10in an insulated manner. The conductive member30is provided with a liquid injection port301for injecting an electrolyte solution into the accommodating cavity1011, and a sealing member40which covers the liquid injection port301. The sealing member40is connected to the liquid injection port301in a sealed manner. The cell20has thereon a first tab201and a second tab202, where the first tab201is electrically connected to the case10by welding and the like, and the second tab202is also electrically connected to the conductive member30by welding or bonding. The case10and the conductive member30are electrically connected to an electronic device, respectively, so that the cell20provides electrical energy for the electronic device through the case10and the conductive member30.

As shown inFIG.2toFIG.4, the case10includes a bottom shell101and a top cover102, the bottom shell101is provided with a sink extending towards a bottom wall of the bottom shell101, forming the accommodating cavity1011for accommodating the cell20. The top cover102covers an opening which is in communication with the accommodating cavity1011, so that the case10having the accommodating cavity1011is enveloped and formed by the bottom shell101and the top cover102. In order to improve the sealing performance, the top cover102and the bottom shell101are connected in a sealed manner, such as by way of welding and the like.

The shape of the cross section of the case10can be any shape such as a circle, an ellipse, and a polygon, etc., which is not limited in the present embodiment.

Since the cell20provides electrical energy for the electronic device through the case10and the conductive member30, the case10and the conductive member30can be made of stainless steel, copper, iron or other metal materials.

The top cover102is provided with an opening1021, so that the top cover102forms a ring structure. The conductive member30covers the opening1021, with a sealant ring50arranged in between, where the sealant ring50makes the conductive member30be connected to the opening1021in an insulated and sealed manner. In other words, the conductive member30is bonded to an edge of the opening1021through the sealant ring50, and covers the opening1021of the top cover102. The shape of the opening1021can be a circle, an ellipse, or a polygon, etc.

In order to improve the sealing performance of the connection between the conductive member30and the top cover102, the conductive member30can be bonded to the top cover102through the sealant ring50by heating and pressurizing. In this way, the bonding reliability of the sealant ring50can be improved, thereby improving the sealing performance of the connection between the conductive member30and the top cover102.

Furthermore, the conductive member30may protrude out of the surface of the top cover102. Or, a second glue-overflow groove1023for placing the conductive member30may be provided on the top cover102, such that the conductive member30may reside in the second glue-overflow groove1023, as shown inFIG.5, with upper surfaces of the conductive member30and the top cover102being even. When the conductive member30is connected to the top cover102through the sealant ring50in an insulated and sealed manner, glue will overflow at the sealant ring50during the heating and pressurizing. But with the above arrangement, the overflowed glue will be kept within the second glue-overflow groove1023and will not overflow the surface of the top cover102. In this way, the surface of the top cover102is relatively flat, and the overall structure of the button cell is more compact, improving the overall aesthetics of the button cell.

In an embodiment, the opening1021is a circular hole, the conductive member30is a disc shape, and the diameter of the opening1021is less than that of the conductive member30. Thus, at least a partial edge of the conductive member30overlaps with a partial edge of the opening1021in the radial direction. The opening1021and the conductive member30are tightly bonded through the sealant ring50by heating and pressurizing. The sealant ring50under high temperature and high pressure can make the opening1021be connected to the conductive member30more tightly, thereby improving the sealing performance of the button cell.

Since larger overlapped unilateral part between the edge of the conductive member30and the edge of the opening1021in the radial direction means better sealing performance, the overlapped unilateral part between the conductive member30and the opening1021in the radial direction is greater than or equal to 0.3 mm in an embodiment. In this way, the sealing area between the conductive member30and the opening1021is increased, thereby improving the sealing performance between the conductive member30and the opening1021.

Furthermore, as shown inFIG.3, the conductive member30is provided with an extension part303which passes through the opening1021. For example, the conductive member30may be formed into a T-shaped conductive member30. In this way, the extension part303and a hole wall of the opening1021are connected in a sealed manner through the sealant ring50, which further increases the sealing area between the conductive member30and the opening1021, thereby improving the sealing performance between the conductive member30and the opening1021. In that case, the sealant ring50can be made from a soluble material to improve the corrosion resistance and the sealing performance of the sealant ring50against electrolyte solution.

In that case, the sealant ring50is shaped as a ring. When the conductive member30and the top cover102is heated and pressurized, an outer edge of the sealant ring50overflows out of the joint of the conductive member30and the top cover102, while an inner edge of the sealant ring50overflows out of the joint of the sealant ring50and an edge of the opening1021of the top cover102. In this way, the connection reliability of the sealant ring50in connecting the conductive member and the top cover102can be ensured.

On the basis of the above embodiment, as shown inFIG.1toFIG.4, the conductive member30is also provided with a liquid injection port301for injecting an electrolyte solution into the accommodating cavity1011, where the liquid injection port301can be in any shape, such as a circle, a quadrangle, a polygon, etc. In an embodiment, the liquid injection port301is arranged coaxially with the conductive member30, and the conductive member30is arranged coaxially with the accommodating cavity1011for accommodating the cell20in the case10.

In an embodiment, in order to improve the sealing performance between the sealing member40and the liquid injection port301, a first counter bore302is arranged on one end of the liquid injection port301facing away from the accommodating cavity1011, and the diameter of the first counter bore302is greater than that of the liquid injection port301. The first counter bore302is in communication with and arranged coaxially with the liquid injection port301. In that case, the shape of the first counter bore302conforms to the shape of the liquid injection port301. In other words, when the shape of the liquid injection port301is circular, the shape of the first counter bore302is also circular. Exemplarily, the depth of the first counter bore302may be 0.01-0.5 mm.

The liquid injection port301is covered with a sealing member40. In other words, the sealing member40is located in the first counter bore302. Since the depth of the first counter bore302is relatively small, the sealing member40may be a sheet structure located in the first counter bore302to cover the liquid injection port301. In order to improve sealing performance, the sealing member40is connected to the liquid injection port301in a sealed manner. For example, the sealing member40can be welded to the liquid injection port301. In other words, after the electrolyte solution is injected into the accommodating cavity1011through the liquid injection port301, welding is performed at the joint between the sealing member40and the first counter bore302outside the case10, so as to improve the sealing performance.

Exemplarily, the sealing member40can be a sealing nail. The sealing nail is placed within the first counter bore302, then the joint therebetween is welded together.

As shown inFIG.4, when the sealing nail is sealed with the liquid injection port301by welding, in order to facilitate welding, the diameter of the first counter bore302is greater than that of a cap of the sealing nail. The part of the sealing nail located in the first counter bore302has a weld mark, in other words, a welding device can weld the joint between the sealing nail and the conductive member30from the inside of the first counter bore302. For example, a laser beam of a laser welding device can extend into the first counter bore302to weld the sealing nail and the conductive member30together.

Alternatively, the sealing member40can also be located in the first counter bore302and bonded with the counter bore through a sealant ring or the like, so as to simplify the manufacturing process.

In an alternative implementation, the cell20is a wound-type cell20. Specifically, the wound-type cell20includes a first plate, a second plate and a battery separator separating the two. The first plate is provided with a first tab201, which can be arranged on the first plate by welding. The second plate is provided with a second tab202, which can be arranged on the second plate by welding. In a winding process, the first plate, the second plate, and the battery separator are wound layer by layer in the same direction from a winding head, eventually forming the wound-type cell20.

It is understandable that the first plate of the cell20can be a positive plate, and the second plate can be a negative plate. In this case, the first tab201arranged on the first plate is a positive tab, and the second tab202arranged on the second plate is a negative tab. In a specific implementation, the cell20is accommodated within the accommodating cavity1011. The positive tab is electrically connected to an inner bottom wall of the bottom shell101by welding, so that the bottom shell101is formed into a positive electrode of a button cell. The negative tab is electrically connected to the conductive member30, so that the conductive member30is formed into a negative electrode of the button cell. When the button cell is applied to an electronic device, the bottom shell101is electrically connected to a positive electrode of the electronic device, and the conductive member30is electrically connected to a negative electrode of the electronic device, so that the cell20supplies power to the electronic device.

Or, the first plate of the cell20can be a negative plate, and the second plate can be a positive plate. In this case, the first tab201arranged on the first plate is a negative tab, and the second tab202arranged on the second plate is a positive tab. In a specific implementation, the cell20is accommodated within the accommodating cavity1011. The negative tab is electrically connected to the bottom shell101by welding, so that the bottom shell101is formed into a negative electrode of a button cell. The positive tab is electrically connected to the conductive member30, so that the conductive member30is formed into a positive electrode of the button cell. When the button cell is applied to an electronic device, the bottom shell101is electrically connected to a negative electrode of the electronic device, and the conductive member30is electrically connected to a positive electrode of the electronic device, so that the cell20supplies power to the electronic device.

In an embodiment, the second tab202is electrically connected to an end of the extension part303of the conductive member30extending into the accommodating cavity1011, such that the contact area between the second tab202and the conductive member30can be increased, thereby improving the reliability of the electrical connection. In that case, in order to prevent the top cover102from interfering with the connection between the second tab202and the extension part303, one end of the extension part303facing the accommodating cavity1011is arranged to protrude out of an inner wall of the top cover102after the extension part303is extended into the accommodating cavity1011. In this way, when the second tab202is connected to an end surface of the extension part303, a gap can be found between the second tab202and the inner wall of the top cover102. Or, an insulating layer can be provided between the inner wall of the top cover102and the second tab202, so as to improve the reliability of the electrical connection between the second tab202and the conductive member30.

It should be noted that the first tab201is electrically connected to the top cover102in the case10by welding or bonding.

Alternatively, in order to improve the reliability of the electrical connection between the first tab201and the second tab202, an insulating layer can be provided on both the first tab201and the second tab202in the circumferential direction, and the first tab201or the second tab202only needs to expose a part to be electrically connected to the bottom shell101or the conductive member30.

Alternatively, a cell cavity203can be formed at a center position of the wound-type cell20while winding. After the cell20is placed into the accommodating cavity1011, the cell cavity203and the liquid injection port301are arranged coaxially. In this way, when an electrolyte solution is injected into the accommodating cavity1011, the plates and the battery separator and so on in the cell20will not block the injection of the electrolyte solution, which improves the efficiency of the injection of the electrolyte solution, thereby increasing the production efficiency of the button cell.

In an embodiment, as shown inFIG.3, an abutment member60can also be inserted into the cell cavity203via the liquid injection port301, where the abutment member60may be a column structure, such as a cylindrical structure or a prismatic structure. It can be composed of one column piece, or two or more column pieces connected end to end in sequence. When the first tab201is welded to the inner bottom wall of the bottom shell101, the abutment member60is firstly inserted into the cell cavity203, so that a first end of the abutment member60abuts against the first tab201, with pressure applied to a second end of the abutment member60, so that the first tab201is pressed against the inner bottom wall of the bottom shell101by the pressure from the abutment member60before the welding is performed. In this way, the reliability of the welding between the first tab201and the bottom shell101can be improved, thereby improving the reliability of the electrical connection between the first tab201and the bottom shell101.

It should be noted that, in order to facilitate a user to operate, the second end of the abutment member60can protrude out of the top cover102of the case10. When the first tab201has been welded to the inner bottom wall of the bottom shell101in the button cell, and the top cover102having conductive member30is connected to the bottom shell101in a sealed manner, the abutment member60can be retracted out of the cell cavity203via the liquid injection port301.

Due to the possibility of vibration during a welding process, if the bottom shell101is connected to the top cover102in a sealed manner before the first tab201is welded to the bottom shell101, the vibration will cause a displacement between the bottom shell101and the top cover102, leading to misalignment therebetween. As a result, the sealing connection between the bottom shell101and the top cover102can become loose or fail, eventually leading to inferior sealing performance of the button cell. Therefore, in the present embodiment, the cell20with the first tab201and the second tab202are firstly placed into the accommodating cavity1011of the bottom shell101, and the abutment member60is inserted into the cell cavity203of the cell20to press on the first tab201, so that the first tab201is pressed against the inner bottom wall of the bottom shell101. After that, a welding device is utilized to weld the bottom shell101and the first tab201to create the electrical connection between the first tab201and the bottom shell101, and then, the top cover102having the conductive member30is connected to the bottom shell101in a sealed manner by welding or bonding. Although vibration will still occur when the bottom shell101is being welded to the top cover102, the abutment member60will constantly abut against the first tab201, preventing the problem of connection looseness caused by the vibration, between the first tab201and the inner wall of the bottom shell101. This can, while ensuring the reliability of the connection between the first tab201and the bottom shell101, improve the reliability of the sealing connection between the bottom shell101and the top cover102, thereby improving the sealing performance of the button cell.

In a specific implementation of the button cell provided by the embodiments of the present disclosure, the top cover102is firstly connected, by heating and pressurizing, to the conductive member30through a sealant ring50in an insulated and sealed manner, and then the cell20is placed into the accommodating cavity1011in the bottom shell101. The abutment member60is inserted into the cell cavity203, with a first end of the abutment member60abutting against the first tab201, and a second end of the abutment member60protruding out of the top cover102. By pressing on the abutment member60, the first tab201is pressed against the inner bottom wall of the bottom shell101. The first tab201is welded to the bottom shell101by a welding device. Then, the top cover102having the conductive member30covers the bottom shell101, and the bottom shell101is connected to the top cover102in a sealed manner by bonding or welding, and the second tab202on the cell20is electrically connected to the conductive member30. Then, the abutment member60is retracted, and the electrolyte solution is injected into the accommodating cavity through the liquid injection port301. After the electrolyte solution is injected, the sealing member40covers the injection port301, and the sealing member40is connected to the injection port301in a sealed manner by bonding or welding.

In the button cell provided by the embodiments of the present disclosure, the conductive member covers the opening of the top cover, and the top cover is connected to the conductive member through a sealant ring in an insulated and sealed manner, the cell is placed in the accommodating cavity of the bottom shell, the first tab on the cell is welded to the inner bottom wall of the bottom shell, then the top cover having the conductive member is connected to the bottom shell in a sealed manner, and then the second tab on the cell be electrically is connected to the conductive member. An electrolyte solution is injected into the accommodating cavity through the liquid injection port of the conductive member. After the electrolyte solution is injected, the sealing member covers the liquid injection port, and the sealing member is connected to the liquid injection port in a sealed manner by bonding or welding, thereby improving the sealing performance of the button cell.

Example II

As shown inFIG.6toFIG.9, in a button cell provided by the embodiment of the present disclosure, the conductive member30is provided with the extension part303protruding towards the accommodating cavity. The first glue-overflow groove1022, which is in ring shape, is formed between the extension part303and an edge of the opening, such that a glue overflowing from an inner edge of the sealant ring50may reside in the first glue-overflow groove1022. The overflowed glue can further improve the sealing performance between the conductive member30and the top cover102. The width of the first glue-overflow groove1022in a radial direction of the cell20is between 0.1 and 3 mm, such that the overflowed glue can be accommodated, at the same time, the external dimension of the button cell can also be fulfilled.

Alternatively, as shown inFIG.8, a second counter bore is arranged on the top cover102, in which the conductive member30is located, and a second glue-overflow groove1023is formed between an outer edge of the conductive member30and a side wall of the second counter bore. A glue overflowing from an outer edge of the sealant ring50may reside in the second glue-overflow groove1023, further improving the sealing performance between the conductive member30and the top cover102, thereby improving the overall sealing performance of the button cell. Moreover, since the overflowed glue is kept within the second glue-overflow groove1023, the surface flatness and the overall aesthetics of the button cell can be improved. Additionally, the width of the second glue-overflow groove1023in the radial direction of the cell20is configured to be between 0.1 and 3 mm, so that the accommodation of the overflowed glue is ensured while the external dimension of the button cell can also be fulfilled.

Furthermore, in order to prevent liquid such as water from infiltrating the cavity of the button cell via the second glue-overflow groove1023, a sealant can also be arranged in the second glue-overflow groove1023to seal up any gap between the conductive member30and the case10, so as to improve the sealing performance of the button cell, where the sealant may be a glue made by mixing any one of acrylic acid, epoxy resin and polyurethane with a curing agent, or a sealant made from other sealing materials, which is not limited in the present embodiment.

In a process of assembling a button cell, since the cell20is placed into the accommodating cavity before the first tab201on the cell20is electrically connected to the inner bottom wall of the bottom shell101by welding, etc., an abutment member, which can be a cylindrical pin or the like, is typically inserted into the cell cavity203of the cell20in order to improve the reliability of the electrical connection between the first tab201and the inner bottom wall of the bottom shell101. The first tab201is abutted against the inner bottom wall of the bottom shell101by the abutment member before the first tab201and the inner bottom wall of the bottom shell101are welded.

It should be noted that a surface of the first tab201facing the cell is provided with a concave weld mark, at which a welding device welds the first tab201and the bottom shell101by way of, e.g., electric-resistance welding or laser welding. When the electric-resistance welding is used, there can be one weld mark, and when the laser welding is used, there can be four weld marks. In order to ensure the reliability of the welding, a depth of the weld mark can be 20-200 μm; or, a height of the weld bump formed after the welding can be 10-120 μm. The weld bump after welding may be formed to be one or more individual weld bumps, or a straight line formed by a plurality of weld bumps, which is not limited in the present embodiment.

A first insulating rubber layer70is arranged between a lower end surface of the cell20and an inner bottom wall of the bottom shell101in order to preclude electrical conductivity between the cell20and the bottom shell101. A second insulating rubber layer80is arranged between an upper end surface of the cell20and the top cover102in order to preclude electrical conductivity between the cell20and the top cover102. Thus, in order to facilitate the insertion of the abutment member into the cell cavity203of the cell20to abut against the first tab201, and in order to leeway for a welding device to weld the first tab201and the bottom shell101, the first insulating rubber layer70in the present embodiment is provided with a first through hole701, which is arranged coaxially with the cell cavity203, where the weld mark on the first tab201should be arranged in an area corresponding to the first through hole701and the cell cavity203. In other words, the first insulating rubber layer70is provided with a first through hole701, so that the first insulating rubber layer70will not shadow the weld mark on the first tab201. This facilitates the welding device to weld the first tab201and the bottom shell101, without having to arrange any weld mark on the outer bottom wall of the bottom shell101. That is, an area on an outer bottom wall of the bottom shell101corresponding to the weld mark will be a smooth flat surface or a rounded surface. Had the weld mark been arranged on the outer bottom wall of the bottom shell101, external strong corrosives might corrode the button cell via that weld mark, compromising the safety and reliability of the button cell. In view of this, the weld mark in the present embodiment is arranged on the surface of the first tab201facing the cell to avoid such external strong corrosives from corroding the weld mark, thereby improving the safety and reliability of the button cell.

Furthermore, the second insulating rubber layer80is provided with a second through hole801that is arranged coaxially with the cell cavity203, so that the abutment member can pass through the first through hole701, the second through hole801and the cell cavity203to abut against the first tab201to allow for the welding device to weld the first tab201and the bottom shell101, thereby improving the connection reliability between the first tab201and the inner bottom wall of the bottom shell101, simplifying the assembling of the button cell, and improving the safety and reliability of the cell20.

Furthermore, in order to facilitate the insertion of the abutment member into the cell cavity203of the cell20, the diameter of the first through hole701can be greater than that of the cell cavity203, and the diameter of the second through hole801can be greater than that of the cell cavity203, such that the edge of the first through hole701and the edge of the second through hole801will not interfere with the insertion of the abutment member.

Furthermore, as shown inFIG.7andFIG.8, in order to ensure operational reliability of the first insulating rubber layer70and the second insulating rubber layer80, and to facilitate the insertion of the abutment member, the diameter of the first through hole701in the present embodiment is 0-0.5 mm larger than that of the cell cavity203, and the diameter of the second through hole801is 0-0.5 mm larger than that of the cell cavity203. In other words, under ideal conditions, the diameters of the first through hole701and the second through hole801and the cell cavity203are the same. In case of fabrication error, the diameter of the first through hole701or the second through hole801may be larger than the diameter of the cell cavity203in order to avoid interference of the first insulating rubber layer70and the second insulating rubber layer80in the insertion of the abutment member into the cell cavity203, as long as insulation is ensured between a lower end surface of the cell20and the bottom shell101, as well as between an upper end surface of the cell20and the top cover102.

On the basis of the above embodiment, in order to ensure that the second tab202does not form electrical connection with the top cover102when the second tab202is electrically connected to the conductive member30, a third insulating rubber layer90is arranged in the present embodiment between the second tab202and the top cover102. The top cover102is insulated from the second tab202by the third insulating rubber layer90, so as to improve the reliability of the electrical connection between the second tab202and the conductive member30.

In an implementable embodiment, the third insulating rubber layer90is a circular ring that is attached to an inner wall of the top cover102, and covers a location on the second tab202corresponding to the top cover102.

Specifically, in order to prevent the third insulating rubber layer90from interfering with the welding or bonding between the top cover102and the bottom shell101, a circumference of the third insulating rubber layer90is smaller than a circumference of the top cover102along the radial direction of the cell20.

Furthermore, the third insulating rubber layer90is further provided with a third through hole901that is arranged coaxially with the cell cavity203in order to prevent the top cover102from being electrically connected to the second tab202. Thus, in the present embodiment, the diameter of the third through hole901is less than the radial dimension of the opening of the top cover102. In this way, electrical connection between the second tab202and the top cover102can be avoided, while the second tab202can partially pass through the third through hole901and be electrically connected to the conductive member30.

In an embodiment, an outer radius of the third insulating rubber layer90is 0.05-2 mm smaller than that of the top cover102along the radial direction of cell20, and the diameter of the third through hole901is 0-2 mm smaller than the radial dimension of the opening of the top cover102, so that the reliability of the connection between the second tab202and the conductive member30is improved.

In another implementable embodiment, the third insulating rubber layer90can be attached to a side of the second tab202closer to the top cover102, forming a protective rubber for the second tab202. A distance between an edge of the third insulating rubber layer90on the second tab202and the axis of the cell20is less than a distance between the opening of the top cover102and the axis of the cell20along the radial direction of the cell20. In other words, the protective rubber on the second tab202extends along the radial direction of the cell20towards the axis of the cell20, with the edge of the protective rubber on the second tab202extending beyond the edge of the opening of the top cover102. In this way, electrical connection can be precluded between the second tab202and the top cover102, thereby improving the reliability of the connection between the second tab202and the conductive member30.

On the basis of the above embodiment, as shown inFIG.6andFIG.9, in order to prevent the first insulating rubber layer70from interfering with the connection of the first tab201and the plate of the cell20, edge-cutting treatment is applied to the first insulating rubber layer70in the present embodiment, so that the edge of the first insulating rubber layer70can be formed into a straight line cut edge. For ease of description, the cut edge on the first insulating rubber layer70is referred to herein as a first cut edge702. Along an axial direction of the cell20, the first cut edge702is flush with the first tab201, so as to avoid any interference by the first insulating rubber layer70with the connection of the first tab201and the plate of the cell20.

Furthermore, in order to avoid the interference in the connection of the second tab202and the plate of the cell20, edge-cutting treatment is also applied to the second insulating rubber layer80, so that the edge of the second insulating rubber layer80can be formed into a straight line cut edge. For ease of description, the cut edge on the second insulating rubber layer80is referred to herein as a second cut edge802. Along an axial direction of the cell20, the second cut edge802is flush with the second tab202, so as to avoid any interference by the second insulating rubber layer80with the connection of the second tab202and the plate of the cell20, thereby improving the operational reliability of the button cell.

Alternatively, the conductive member30is also provided with a liquid injection port301. When the cell20is placed in the accommodating cavity, the first tab201of the cell20is electrically connected to the inner bottom wall of the bottom shell101, and the second tab202is electrically connected to the conductive member30, an electrolyte solution is then injected into the accommodating cavity via the liquid injection port301of the conductive member30. After the electrolyte solution is injected, the liquid injection port301is covered by the sealing member40in a sealed manner.

Furthermore, in order to improve the surface flatness of the button cell, a first counter bore for accommodating the sealing member40can be arranged on the conductive member30, and the depth of the first counter bore can be equal to the thickness of the sealing member40. In this way, when the sealing member40covers the liquid injection port301, the sealing member40is flush with the surface of the conductive member30, thereby improving the surface flatness of the button cell.

In specific implementation of the button cell provided by the embodiment of the present disclosure, the top cover102is firstly connected to the conductive member30via the sealant ring50in an insulated and sealed manner by heating and pressurizing, then the cell20is placed into the accommodating cavity of the bottom shell101, and then the top cover102having the conductive member30is connected to the bottom shell101in a sealed manner by welding and the like. The abutment member60is inserted into the cell cavity203of the cell20, with the first end of the abutment member60abutting against the first tab201, and the second end of the abutment member60protruding out of the top cover102, providing ease of handling for a user. With the first tab201being pressed against the inner bottom wall of the bottom shell101by the abutment member, the first tab201is welded to the bottom shell101by a welding device, and the second tab202on the cell20is electrically connected to the conductive member30by welding and the like. Then, the abutment member60is retracted, and the electrolyte solution is injected into the accommodating cavity through the liquid injection port301. After the electrolyte solution is injected, the sealing member40covers the injection port301, the sealing member40is connected to the injection port301in a sealed manner by bonding or welding, completing the assembly of the button cell.

Moreover, in the embodiment of the present disclosure, the first insulating rubber layer70is provided with the first through hole701, the second insulating rubber layer80is provided with the second through hole801, and the third insulating rubber layer90is provided with the third through hole901, such that the abutment member can sequentially pass through the third through hole901, the second through hole801, the cell cavity203of the cell20, and the first through hole701and abut against the first tab201, simplifying the assembling of the button cell, and improving the operational reliability of the button cell.

In the button cell provided by the embodiment of the present disclosure, the conductive member is provided with the extension part protruding towards the accommodating cavity, with the first glue-overflow groove being formed between the extension part and the edge of the opening, containing the glue which overflows out of the sealant ring in the first glue-overflow groove. In this way, the glue which overflows out of the first glue-overflow groove can additionally seal the conductive member and the case, thereby improving the sealing performance of the button cell.

Example III

The examples of the present disclosure further provides an electronic device including an electronic device body and the button cell provided by Embodiment I, the button cell provides electrical energy for the electronic device body.

In that case, the structure and operating principle of the button cell have been described in detail in Embodiment I, and will not be repeated herein.

The electronic device provided by the present disclosure includes the electronic device body and the button cell which provides electrical energy for the electronic device body. In the button cell, a conductive member covers an opening of a top cover, and the top cover is connected to the conductive member via a sealant ring in an insulated and sealed manner. A cell is placed in an accommodating cavity of a bottom shell, with a first tab on the cell being welded to an inner bottom wall of the bottom shell. Then, the top cover having the conductive member is connected to the bottom shell in a sealed manner, and a second tab on the cell is electrically connected to the conductive member. An electrolyte solution is injected into the accommodating cavity via the liquid injection port of the conductive member. After the electrolyte solution is injected, the sealing member cover the liquid injection port, and the sealing member is connected to the liquid injection port in a sealed manner by bonding or welding, thereby improving the sealing performance of the button cell.

Various embodiments or implementations in the specification have been described in a progressive manner, with each embodiment focusing on the differences from other embodiments, and for the same or similar parts among various embodiments, cross-reference can be made to each other.

In the description of the specification, reference terms “an embodiment”, “some embodiments”, “illustrative embodiment”, “example”, “specific example” or “some examples” mean that specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present disclosure. In the specification, the illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

Finally, it should be noted that: the above embodiments are only used to describe the technical solutions of the present disclosure, and do not limit the same. Although the present disclosure has been described in detail referring to the above-mentioned embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions will not make the essentials of the corresponding technical solutions depart from the scope of the technical solutions in the embodiments of the present disclosure.