Patent Description:
A button cell refers to a cell that is shaped like a button, and generally has a large diameter and a thin thickness. Due to the small volume of the button cell, it has been widely used in a variety of miniature electronic devices, for example, the wearable electronic device field and the medical product field and the like.

In the prior art, the button cell includes a housing, a conductive member and a sealing member. The housing is provided with a through hole that communicates with a chamber for accommodating an electrolyte, the conductive member covers the through hole and is disposed outside of the button cell, and the conductive member is attached to the housing through a sealing rubber ring; and the sealing member covers an injection port of the conductive member.

However, since the interior of the button cell is a closed space, the existing button cell has a problem of low safety and stability.

<CIT> discloses a button cell and an electronic device. The button cell includes a housing and a cover assembly; the housing includes a bottom wall and an annular side wall; the cover assembly includes a top cover having a through hole at its central area and a conductive member covering the through hole; an outer edge of the top cover is welded with a top of the side wall to form an accommodating chamber for accommodating an electrode assembly and an electrolyte; and the conductive member is disposed on a side of the top cover facing the accommodating chamber, and the electronic device includes the button cell.

<CIT> discloses a battery, including a battery cell and a housing assembly accommodating the battery cell. The battery cell includes a first tab. The housing assembly includes a first housing body and a second housing body. The first housing body and the second housing body define an accommodation space to accommodate the battery cell. The first housing body and/or the second housing body include an installation portion provided with a via hole. A conductive member is disposed on an inner surface or an outer surface of the housing assembly and electrically connected to the first tab. In a through direction of the via hole, a projection of the conductive member is at least partially located in the via hole.

<CIT> discloses a button cell and its manufacturing method and an electronic device and is related to the field of battery technology. The conductive member of the button cell is covered on the through hole of the top cover, the top cover and the conductive member are insulated and sealed together by the sealing ring, the battery core is placed in the accommodation cavity of the bottom case, the first tab of the battery core is welded to the inner bottom wall of the bottom case, the top cover with the conductive member is tightly connected to the bottom case, and the second tab of the battery core is electrically connected with the conductive member, and finally the electrolyte is injected into the accommodation cavity through the injection opening of the conductive member, after the electrolyte injection is completed, the injection opening is covered by the sealing member and the sealing member is tightly connected to the injection opening.

<CIT> discloses a cover plate for a metal shell of a battery. The cover plate body is provided with a liquid injection hole, the liquid injection hole is provided with a metal sheet that seals the liquid injection hole, the metal sheet is provided with an explosion-proof imprint, the pattern of the explosion-proof imprint consists of lines recessed in the surface of the metal sheet, forming an easily torn part for the explosion-proof purpose.

<CIT> forming part of the state of the art pursuant Article <NUM>(<NUM>) EPC discloses a battery including a battery cell and a casing assembly for receiving the battery cell. The battery cell includes a first electrode tab. The battery further includes an insulating member and a conductive member, the insulating member is connected between the casing assembly and the conductive member. The casing assembly defines a first through hole, and the insulating member defines a second through hole connected to the first through hole. The first electrode tab is electrically connected to the conductive member. A power consuming device including the battery is further provided.

<CIT> forming part of the state of the art pursuant Article <NUM>(<NUM>) EPC discloses a rechargeable battery, including an electrode assembly including a first electrode, a second electrode, a separator located between the first electrode and the second electrode, a first electrode tab extended from the first electrode, and a second electrode tab extended from the second electrode; a case connected to the first electrode tab to accommodate the electrode assembly, and including an opening portion to expose the electrode assembly; a cap plate coupled with the case to cover an outer peripheral region of the opening portion and including a through-hole to expose a center region of the opening portion; and a terminal plate connected to the second electrode tab to be insulation-bonded to the cap plate, and including a flange part covering the through-hole and a protruding part passing through the through-hole from a center portion of the flange part.

The present disclosure provides a button cell and an electronic device to solve the problem that the safety and stability of the existing button cell are low.

On the one hand, the present disclosure provides a button cell including a housing and a cover assembly;.

According to the present invention the conductive member is provided with an injection port for injecting the electrolyte into the accommodating chamber;
the cover assembly further includes a sealing member covering the injection port, and the sealing member is located on a side of the conductive member facing away from the accommodating chamber.

In an optional implementation, a protrusion arranged through the through hole is disposed on the conductive member, the protrusion is disposed on a surface of the conductive member abutting against the top cover; and a side of the conductive member facing the accommodating chamber is a plane.

In an optional implementation, the injection port penetrates the protrusion, and a center of the protrusion coincides with a center of the injection port.

By hermetically connecting the protrusion with a hole wall of the through hole through a sealing rubber ring, a contact area between the conductive member and the through hole is further increased, which not only improves the hermeticity between the conductive member and the through hole, but also enhances the tolerance of the conductive member to the pressure inside the button cell.

In an optional implementation, an end surface of the protrusion away from the accommodating chamber flushes with an end surface of the housing away from the accommodating chamber; or the end surface of the protrusion away from the accommodating chamber is located between the end surface of the housing away from the accommodating chamber and an end surface of the housing close to the accommodating chamber.

In an optional implementation, an end of the protrusion away from the accommodating chamber is provided with a counter bore, the counter bore communicates with the injection port, and a center of the counter bore coincides with the center of the injection port.

After the electrolyte is injected into the accommodating chamber through the injection port, a joint between the sealing member and the counter bore is welded outside the top cover, thereby improving the sealing performance between the sealing member and the injection port.

In an optional implementation, a distance between the end surface of the protrusion away from the accommodating chamber and an end surface of the protrusion close to the accommodating chamber is <NUM>-<NUM>.

According to the present invention a sealing rubber ring is disposed between the conductive member and the top cover.

According to the present invention a groove is disposed on a side of the sealing member facing away from the accommodating chamber, the groove forms a thinning area, and a center of the thinning area coincides with the center of the injection port.

By disposing the thinning area in the sealing member, the pressure inside the button cell may be released and reduced from the thinning area to realize the purpose that the pressure inside the button cell can be discharged in advance, thereby reducing the damage caused by the cell explosion.

On the other hand, the present disclosure also provides an electronic device including an electronic device body and the button cell of any one of the above, and the button cell providing electric energy for the electronic device body.

The present disclosure provides a button cell and an electronic device, the button cell includes a housing and a cover assembly; the housing includes a bottom wall and an annular side wall, and a bottom end of the side wall and the bottom wall are integrally formed; the cover assembly includes a top cover having a through hole at its central area and a conductive member covering the through hole, and the conductive member is connected with the top cover in an insulated manner; an outer edge of the top cover is welded with a top of the side wall to form an accommodating chamber for accommodating an electrode assembly and an electrolyte, an outer surface of the outer edge of the top cover has a welding mark, and a welding penetration extends in a direction from the top cover to the side wall; and the conductive member is disposed on a side of the top cover facing the accommodating chamber. By disposing the conductive member on the side of the top cover facing the accommodating chamber, an extrusion force of the conductive member to the top cover is larger than an adhesive force between a conductive member disposed on a side of a top cover away from the accommodating chamber and the top cover in the prior art, thereby increasing the tolerance of the conductive member to the pressure inside the button cell, reducing the damage caused by the button cell explosion, and improving the safety and stability of the button cell.

In order to more clearly explain technical solutions of embodiments of the disclosure or in the prior art, the drawings required in the description of the embodiments or the prior art will be briefly described below. Obviously, the drawings in the description below are some embodiments of the disclosure, and for those of ordinary skill in the art, other drawings may be obtained from these drawings without creative effort.

In the description of this specification, the description of the terms "one implementation", "some implementations", "schematic implementations", "examples", "specific examples", or "some examples" and the like means that the specific features, structures, materials or characteristics described in combination with implementations or examples are included in at least one implementation or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same implementation or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in an appropriate manner in any one or more implementations or examples.

It should be noted that the terms "first" and "second" are used only for descriptive purposes and cannot be understood to indicate or imply relative importance or implicitly designate the number of indicated technical features. Therefore, the features defined with "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "a plurality of" means at least two, such as two, three and the like, unless otherwise specifically defined.

In the present disclosure, unless otherwise clearly specified and defined, the terms "mounting", "connection/connecting", "fixing" and the like should be understood in a broad sense. For example, it may be a fixed connection or a detachably connection, or may be integrated; it may be a mechanical connection, or may be an electrical connection or may communicate with each other; it may be directly connected, or indirectly connected by an intermediate medium, or allow communication within two elements or the interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure may be understood according to the specific situation.

In the present disclosure, unless otherwise expressly specified and defined, a first feature being "above" or "below" a second feature may refer to the first feature and the second feature being in direct contact, or the first feature and the second feature being not in direct contact but being in contact through a medium therebetween. Moreover, the first feature being "over", "above" and "on" the second feature may mean that the first feature is directly above and diagonally above the second feature, or simply indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below and diagonally below the second feature, or simply indicate that the horizontal height of the first feature is less than that of the second feature.

In the above description, the description of the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like means that the specific features, structures, materials or characteristics described in combination with embodiments or examples are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. Further, without contradicting with each other, those skilled in the art may integrate and combine different embodiments or examples and the features of the different embodiments or examples described in this specification.

A button cell refers to a cell that is shaped like a button, and generally has a large diameter and a thin thickness. Due to the small volume of the button cell, it has been widely used in a variety of miniature electronic devices, for example, the wearable electronic device field and the medical product field and the like. In the prior art, the button cell includes a housing, a conductive member and a sealing member. The housing is provided with a through hole that communicates with a chamber for accommodating an electrolyte, the conductive member covers the through hole and is disposed outside of the button cell, and the conductive member is attached to the housing through a sealing rubber ring; and the sealing member covers an injection port of the conductive member. However, since the interior of the button cell is a closed space, the existing button cell has a problem of low safety and stability.

In order to solve the above problem, the present disclosure provides a button cell and an electronic device. By disposing a conductive member on a side of a top cover facing an accommodating chamber, an extrusion force of the conductive member to the top cover is larger than an adhesive force between a conductive member that is disposed on a side of a top cover away from the accommodating chamber and the top cover in the prior art, in this way, the tolerance of the conductive member to the pressure inside the button cell is increased, thereby reducing the damage caused when the battery explosion, and further enhancing the safety and the stability of the button cell.

A button cell and an electronic device provided in the present disclosure will be described in detail below with reference to the specific embodiments.

<FIG> is a schematic diagram of a first structure of a button cell provided in the present disclosure; and <FIG> is a structural schematic diagram of a conductive member in the button cell provided in <FIG>.

The present disclosure provides a button cell including a housing <NUM> and a cover assembly <NUM>; the housing <NUM> includes a bottom wall <NUM> and an annular side wall <NUM>, a bottom end of the side wall <NUM> is integrally formed with the bottom wall <NUM>; the cover assembly <NUM> includes a top cover <NUM> having a through hole at its central area and a conductive member <NUM> covering the through hole, and the conductive member <NUM> is connected with the top cover <NUM> in an insulated manner; an outer edge of the top cover <NUM> is welded to a top end of the side wall <NUM> to form an accommodating chamber <NUM> accommodating an electrode assembly <NUM> and an electrolyte; an outer surface of the outer edge of the top cover <NUM> has a welding mark, with a welding penetration extending in a direction from the top cover <NUM> to the side wall <NUM>; and the conductive member <NUM> is disposed on a side of the top cover <NUM> facing the accommodating chamber <NUM>.

A cross-section of the housing <NUM> may be of any shape such as a circular shape, an elliptical shape, and a polygonal shape. Here, it is not limited in the present disclosure.

The through hole is disposed on the top cover <NUM>, so that the top cover <NUM> forms an annular structure. The through hole may be of a circular shape, an elliptical shape, a polygonal shape and the like, and is not specifically limited herein.

The electrode assembly <NUM> is located within the accommodating chamber <NUM>. The electrode assembly <NUM> includes a positive electrode sheet, a negative electrode sheet and a separator for separating the positive electrode sheet and the negative positive electrode sheet; a first tab <NUM> is disposed on the positive electrode sheet, and the first tab <NUM> may be disposed on the positive electrode sheet by welding, a second tab <NUM> is disposed on the negative electrode sheet, and the second tab <NUM> may be disposed on the negative electrode sheet by welding; during a winding process, the positive electrode sheet, the negative electrode sheet and the separator are wound layer by layer from a winding head end in the same direction and finally form the electrode assembly <NUM>.

The first tab <NUM> and the housing <NUM> are electrically connected by welding and the like, and the second tab <NUM> and the conductive member <NUM> are also electrically connected by welding or bonding. The housing <NUM> and the conductive member <NUM> are electrically connected with the positive electrode and the negative electrode of the electronic device, respectively, so that the electrode assembly <NUM> supplies electric energy to the electronic device through the housing <NUM> and the conductive member <NUM>.

Since the electrode assembly <NUM> supplies electric energy to the electronic device through the housing <NUM> and the conductive member <NUM>, the housing <NUM> and the conductive member <NUM> may be made of metal material, such as stainless steel, copper, iron, aluminum and other metal material.

The conductive member <NUM> is disposed on the side of the top cover <NUM> facing the accommodating chamber <NUM>, and abuts against an abutting surface of the top cover <NUM>. The through hole is covered by the conductive member <NUM>, and the conductive member <NUM> and the top cover <NUM> are connected in an insulated and hermetical manner. The insulated and hermetical connection between the conductive member <NUM> and the top cover <NUM> may be achieved by bonding with an insulated seal ring, or may be realized by other ways, which is not specifically set herein.

An injection port <NUM> for injecting the electrolyte into the accommodating chamber <NUM> is also disposed in the conductive member <NUM>, and may be of any shape such as circle, quadrilateral, polygon and the like. In one embodiment, the injection port <NUM> is concentrically disposed with the conductive member <NUM>, and the conductive member <NUM> is concentrically disposed with the accommodating chamber <NUM> for accommodating the electrode assembly <NUM>.

It should be noted that in order to improve the connection sealability between the conductive member <NUM> and the top cover <NUM>, the conductive member <NUM> may be bonded to an inner wall of top cover <NUM> through a sealing rubber ring <NUM> by means of heating and pressurizing. In this way, the bonding reliability of the sealing rubber ring <NUM> may be improved, thereby enhancing the connection sealability between the conductive member <NUM> and the top cover <NUM>.

In the button cell provided in the present disclosure, by providing the conductive member <NUM> on the side of the top cover <NUM> facing the accommodating chamber <NUM>, an extrusion force of the conductive member <NUM> to the top cover <NUM> is larger than an adhesive force between a conductive member disposed on a side of a top cover away from the accommodating chamber and the top cover in the prior art, thereby increasing the tolerance of the conductive member <NUM> to the pressure inside the button cell, reducing the damage caused by the button cell explosion, and improving the safety and stability of the button cell.

Optionally, the cover assembly <NUM> further includes a sealing member <NUM> covering an injection port <NUM>, the sealing member <NUM> is located on a side of the conductive member <NUM> facing away from the accommodating chamber <NUM>, and the abutting surface between the conductive member <NUM> and an inner wall of the top cover <NUM> is a horizontal plane. The abutting surface between the conductive member <NUM> and the inner wall of the top cover <NUM> is configured to be a horizontal plane, so that the structure of the conductive member <NUM> is simple, thereby reducing the processing cost of the button cell.

Exemplarily, as shown in <FIG>, the top cover <NUM> is in a disc shape, the through hole is a circular hole, the conductive member <NUM> is in a disc shape, and a diameter of the through hole is smaller than a diameter of the conductive member <NUM>. Therefore, an edge of conductive member <NUM> and an edge of through hole are at least partially stacked in a radial direction, which increases the bearing capacity of the conductive member <NUM> on the pressure in the button cell, and the through hole and the conductive member <NUM> are closely bonded through the sealing rubber ring <NUM> by means of heating and pressurizing, which improves the sealing performance of the button cell.

Since the fact that the larger a size of one-sided stacked portion of the edges of the conductive member <NUM> and of the through hole in the radial direction, the better the tolerance of the conductive member <NUM> to the pressure inside the button cell, in one embodiment, the size of the one-sided stacked portion of the conductive member <NUM> and the through hole in the radial direction is greater than or equal to <NUM> and the diameter difference between the conductive member <NUM> and the top cover <NUM> is less than or equal to <NUM>. In this way, the contact area between the conductive member <NUM> and the through hole is increased, thereby increasing the tolerance of the conductive member <NUM> to the internal pressure of button cell.

<FIG> is a schematic diagram of a second structure of a button cell provided in the present disclosure; and <FIG> is a structural schematic diagram of a conductive member in the button cell provided in <FIG>.

Optionally, as shown in <FIG>, the conductive member <NUM> is provided with a protrusion <NUM> which is arranged through the through hole, and the protrusion <NUM> is disposed on a surface of the conductive member <NUM> abutting against the top cover <NUM>. A surface of the conductive member <NUM> facing the accommodating chamber is a plane. The injection port <NUM> penetrates the protrusion <NUM>, and a center of the protrusion <NUM> coincides with a center of the injection port <NUM>.

By hermetically connecting the protrusion <NUM> with a hole wall of the through hole via the sealing rubber ring <NUM>, the contact area between the conductive member <NUM> and the through hole is further increased, which not only improves the hermeticity between the conductive member <NUM> and the through hole, but also enhances the bearing capacity of the conductive member <NUM> to the internal pressure of the button cell.

Further, an end surface of the protrusion <NUM> away from the accommodating chamber <NUM> flushes with an end surface of the housing <NUM> away from the accommodating chamber <NUM>, or the end surface of the protrusion <NUM> away from the accommodating chamber <NUM> is located between the end surface of the housing <NUM> away from the accommodating chamber <NUM> and an end surface of the housing <NUM> close to the accommodating chamber <NUM>. In this way, the overall structure of the button cell is more compact and the overall aesthetics of the button cell is improved.

It should be noted that, according to actual requirements, the center of the protrusion <NUM> may not coincide with the center of the injection port <NUM>, and it is not specifically set herein.

<FIG> is a schematic diagram of a third structure of a button cell provided in the present disclosure; and <FIG> is a structural schematic diagram of a conductive member in the button cell provided in <FIG>.

Optionally, as shown in <FIG>, a counter bore <NUM> is disposed at an end of the protrusion <NUM> away from the accommodating chamber <NUM>, and communicates with the injection port <NUM>. A center of the counter bore <NUM> coincides with the center of the injection port <NUM>, and the sealing member <NUM> is disposed in the counter bore. After the electrolyte is injected into the accommodating chamber <NUM> through the injection port <NUM>, a joint between the sealing member <NUM> and the counter bore <NUM> is welded outside the top cover <NUM>, thereby improving the sealing performance between the sealing member <NUM> and the injection port <NUM>.

A shape of the counter bore <NUM> is the same as that of the injection port <NUM>, that is, when the injection port <NUM> is circular, the counter bore <NUM> is also circular.

Exemplarily, in an extension direction of the injection port <NUM>, a thickness of a portion of the conductive member <NUM> abutting against the top cover <NUM> is between <NUM> and <NUM>, a thickness of the protrusion <NUM> is between <NUM> and <NUM>, and a depth of the counter bore <NUM> may be between <NUM> and <NUM>.

<FIG> is a schematic diagram of a first structure of a sealing member provided in the present disclosure; <FIG> is a structural schematic diagram of a cross-section of the sealing member of <FIG>; <FIG> is a schematic diagram of a second structure of a sealing member provided in the present disclosure; <FIG> is a structural schematic diagram of a cross-section of the sealing member of <FIG>; <FIG> is a schematic diagram of a third structure of a sealing member provided in the present disclosure; <FIG> is a structural schematic diagram of a cross-section of the sealing member of <FIG>; <FIG> is a schematic diagram of a fourth structure of a sealing member provided in the present disclosure; and <FIG> is a structural schematic diagram of a cross-section of the sealing member of <FIG>.

Optionally, the sealing member <NUM> is provided with a thinning area <NUM>.

Since the button cell is a closed space, the pressure in the accommodating chamber <NUM> is relatively large, and when the pressure is too large, the damage degree will be large if a battery explosion occurs. In order to improve the safety and stability of the button cell, in the present disclosure, the thinning area <NUM> is provided in the sealing member <NUM>. Since the pressure bearing capacity of the thinning area <NUM> is smaller than that of a region without the thinning area <NUM>, when the internal pressure of the button cell is increased to a maximum critical value of the pressure that the thinning area <NUM> can bear, the thinning area <NUM> may crack or be directly broken up under the drive of pressure, and the pressure inside the button cell may be decreased by venting from a cracked or broken position of the thinning area <NUM>; and at this time, the internal pressure of the battery cell does not reach a maximum critical value of the pressure that a non-thinning area can bear. Therefore, if the battery explodes, the damage effect on the battery will be greatly reduced, thereby enhancing the safety and stability of the button cell.

In the button cell provided in the embodiments of the present disclosure, the thinning area <NUM> is provided in the sealing member <NUM>. Since the pressure that the thinning area <NUM> can bear is smaller than the pressure that the non-thinning area can bear, so when the internal pressure of the button cell is increased to a level of pressure that the thinning area <NUM> cannot bear, the thinning area <NUM> may crack or even be broken up. In this way, the pressure in the button cell may be decreased by venting from the thinning area <NUM> to realize the purpose that the pressure in the button cell can be released in advance, thereby reducing the damage caused by the explosion of button cell and avoiding the technical problem that the internal pressure of the button cell is too large to be discharged in advance, which may cause the damage after explosion to be relative large.

Optionally, the thinning area <NUM> is located on a side of the sealing member <NUM> facing away from the accommodating chamber <NUM>. By disposing the thinning area <NUM> on the side of the sealing member <NUM> facing away from the accommodating chamber <NUM>, that is, a side of the sealing member <NUM> facing the accommodating chamber <NUM> is a flat plane, in this way, the safety and stability of the button cell are improved, while avoiding reduced battery life caused by the electrolyte in the accommodating chamber <NUM> corroding the connection between the thinning area <NUM> and the area that is not thinned.

In an optional implementation, a groove is provided on the side of the sealing member <NUM> facing away from the accommodating chamber <NUM>, such groove forming the thinning area <NUM>. The groove is provided on the side of the sealing member <NUM> facing away from the accommodating chamber <NUM>, so that the groove forms the thinning area <NUM>, which is simple in structure and low in processing cost.

Optionally, the thinning area <NUM> may be at least one of a cross groove, a ring groove, or a circle groove.

For example, as shown in <FIG>, the thinning area <NUM> is a cross groove; as shown in <FIG>, the thinning area <NUM> is a circular ring groove; as shown in <FIG>, the thinning area <NUM> is a combination of a circular groove and a cross groove; as shown in <FIG>, the thinning area <NUM> is a circle groove. The thinning area <NUM> may also be an elliptical groove, a rectangular groove, a groove of any other regular shape or a combination of grooves of at least two shapes; or may be a groove of any irregular shape; or may be a combination of grooves having regular or irregular shape, which is not specifically limited herein.

Optionally, in order to facilitate processing of the thinning area <NUM>, the center of the thinning area <NUM> coincides with the center of the injection port <NUM>, which facilitates to align the center of the thinning area <NUM> at the time of processing the thinning area <NUM>.

According to the present invention a groove depth of the groove is <NUM>-<NUM>, in this way, while meeting the strength requirements of the sealing member <NUM> during normal operation, the button cell may be discharged and depressurized in advance when the internal pressure of the button cell is too large, thereby reducing the damage caused by the explosion of button cell, and improving the safety and stability of the button cell.

Further, the thinning area <NUM> and the sealing member <NUM> may be integrally formed, so the processing procedures for forming the sealing member <NUM> and the thinning area <NUM> are reduced, thereby reducing the processing cost.

Optionally, the sealing member <NUM> may be a sheet structure, that is, the sealing member <NUM> is a sealing sheet. In this way, a side of the sealing member <NUM> facing the accommodating chamber <NUM> is a flat plane, so the strength of the sealing member <NUM> can be improved, thereby improving the use reliability of the sealing member <NUM>.

In addition, the sealing member <NUM> is provided as a sealing sheet, that is, the thickness of the sealing member <NUM> is relatively small. When the thickness of the sealing member <NUM> is relatively small, the pressure that the sealing member can bear is relatively small. Therefore, when the internal pressure of the button cell exceeds the pressure that the sealing member <NUM> can bear and the button cell explodes, the damage caused by the cell explosion can be reduced.

The present disclosure also provides an electronic device including an electronic device body and a button cell, the button cell providing electric energy for the electronic device body.

The structure of the button cell in the electronic device provided in the present disclosure is the same as the structure of the button cell described above, and can bring the same or similar technical effects, which is not described herein again.

Claim 1:
A button cell, comprising a housing (<NUM>) and a cover assembly (<NUM>); wherein,
the housing (<NUM>) comprises a bottom wall (<NUM>) and an annular side wall (<NUM>), a bottom end of the side wall (<NUM>) and the bottom wall (<NUM>) being integrally formed;
the cover assembly (<NUM>) comprises a top cover (<NUM>) having a through hole at its central area and a conductive member (<NUM>) covering the through hole, the conductive member (<NUM>) being connected with the top cover (<NUM>) by a sealing rubber ring (<NUM>);
an outer edge of the top cover (<NUM>) is welded with a top of the side wall (<NUM>) to form an accommodating chamber (<NUM>) for accommodating an electrode assembly (<NUM>) and an electrolyte, an outer surface of the outer edge of the top cover (<NUM>) has a welding mark, and a welding penetration extends in a direction from the top cover (<NUM>) to the side wall (<NUM>); and
the conductive member (<NUM>) is disposed on a side of the top cover (<NUM>) facing the accommodating chamber (<NUM>);
wherein the conductive member (<NUM>) is provided with an injection port (<NUM>) for injecting the electrolyte into the accommodating chamber (<NUM>);
the cover assembly (<NUM>) further comprises a sealing member (<NUM>) covering the injection port (<NUM>), and the sealing member (<NUM>) is located on a side of the conductive member (<NUM>) facing away from the accommodating chamber (<NUM>);
characterised in that
a groove is disposed on a side of the sealing member (<NUM>) facing away from the accommodating chamber (<NUM>); and
a groove depth of the groove is <NUM>-<NUM>.