CN111952488A

CN111952488A - Button cell

Info

Publication number: CN111952488A
Application number: CN202010949397.4A
Authority: CN
Inventors: 戈志敏; 肖海燕; 顾勇平; 王永伟; 刘晓伟; 简文龙; 余小旦; 吕荣喜; 李阳; 艾清; 刘祥郡; 祝洪根; 董水金
Original assignee: Xinyu Ganfeng Electronics Co Ltd
Current assignee: Xinyu Ganfeng Electronics Co Ltd
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2020-11-17

Abstract

The invention discloses a button cell, comprising: the sealing device comprises a shell, wherein a sealing ring is arranged inside the shell, and the outer wall of the sealing ring is abutted against the inner wall of the shell; the outer edge of the surface cover is inserted into the sealing ring, and the surface cover and the inner wall of the shell form an annular sealing cavity through the sealing ring; the winding core is placed in the annular sealing cavity, the upper part and the lower part of the winding core are provided with tabs, and the tabs at the lower part are connected with the shell; one end face of the PTC sheet is fixed on the face cover, and the other end face of the PTC sheet is fixedly connected with the upper tab. The PTC sheet is added in the battery, when the battery is internally short-circuited due to external force and other reasons, the internal resistance of the PTC sheet is increased along with the temperature rise, so that the effect of isolating current to protect the battery is achieved; the tilting part is inserted into the accommodating groove of the sealing ring to be contacted with the inner wall of the sealing ring, so that water can be prevented from entering the shell along the gap between the surface cover and the sealing ring, and the waterproof effect of the button cell is improved.

Description

Button cell

Technical Field

The invention belongs to the field of batteries, and particularly relates to a button cell.

Background

With the increasing development of electronic products, button cells are widely used in various miniature electronic products due to their lightness and smallness, and are mainly used as backup power sources for various electronic products, such as computer motherboards, electronic watches, electronic dictionaries, electronic scales, memory cards, remote controllers, CPC cards, electronic display screens, and the like, and the requirements of people on button cells are increasing. Button cells are not only portable, but also require ultra-high capacity and service life, and therefore new button cells are developed to meet market demands.

The existing button cell has the following problems: after the button cell is short-circuited, the cell can generate heat and burn, and the like; and because the shell is made of metal material, the shell can be oxidized when the high-voltage version of the battery works, so that the voltage capacity of the button cell is limited.

Disclosure of Invention

In view of the above, the main object of the present invention is to provide a button cell that can suppress heat burning of the cell and prevent the cell case from being corroded.

The invention provides a button cell, comprising: the sealing device comprises a shell, wherein a sealing ring is arranged inside the shell, and the outer wall of the sealing ring is abutted against the inner wall of the shell; the outer edge of the surface cover is inserted into the sealing ring, and an annular sealing cavity is formed by the surface cover and the inner wall of the shell through the sealing ring; the winding core is placed in the annular sealing cavity, the upper part and the lower part of the winding core are provided with tabs, and the tabs at the lower part are connected with the shell; and one end face of the PTC sheet is fixed on the face cover, and the other end face of the PTC sheet is fixedly connected with the upper tab.

In some embodiments of the invention, the face cover is circumferentially provided with a raised portion along a direction away from a vertical axis of the face cover, and the raised portion is inserted into the accommodating groove of the sealing ring and contacts with the inner wall of the sealing ring.

In some embodiments of the present invention, the included angle α between the tilted portion and the horizontal plane is 15 to 30 degrees.

In some embodiments of the invention, the upper part of the shell is provided with a fastening edge, the upper part of the fastening edge is abutted against the upper wall of the sealing ring, and the lower part of the fastening edge is contacted with the winding core.

In some embodiments of the invention, the level of the upper portion of the retaining edge is higher than the level of the upper portion of the face cover.

In some embodiments of the invention, the lower end surface of the seal ring abuts the upper end surface of the winding core.

In some embodiments of the invention, the outer wall of the winding core is in contact with the inner wall of the shell.

In some embodiments of the invention, the outer wall of the face cover and the housing are both provided with a non-metallic film layer.

In some embodiments of the present invention, the sealing ring is made of a silicone material.

In some embodiments of the present invention, the sealing ring is made of TPU.

The button cell provided by the invention has the following beneficial effects:

1. the PTC sheet is added in the battery, when the battery is internally short-circuited due to external force and other reasons, the internal resistance of the PTC sheet is increased along with the temperature rise, and therefore the effect of isolating current and protecting the battery is achieved.

2. Set up the perk portion along the direction circumference of keeping away from the vertical axis of face lid at the face lid, adopt perk portion to insert in the storage tank of sealing washer with the inner wall contact of sealing washer, can avoid water to get into in the casing along the gap department of face lid and sealing washer to button cell's water-proof effects has been improved.

3. Because the non-metal film is plated on the shell and the face cover which are both made of metal materials in vacuum, the battery can be ensured not to corrode a shell when in work, and therefore, the battery not only can be used as a high-voltage version with the nominal voltage of 3.7V, but also can be used as a high-voltage version with the nominal voltage of 3.8V or 3.85V.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is an exploded view of a button cell according to an embodiment of the present invention;

fig. 2 is an overall structural diagram of a button cell battery according to an embodiment of the invention;

FIG. 3 is a cross-sectional view taken along section B-B of FIG. 2;

fig. 4 is an enlarged view of a portion a in fig. 3.

Wherein the figures include the following reference numerals:

10. a housing; 11. buckling and pressing edges; 12. a seal ring; 1201. a containing groove; 20. a face cover; 21. a raised portion; 30. a winding core; 31. a tab; 40. a PTC sheet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, a button cell battery is shown, comprising: the sealing device comprises a shell 10, wherein a sealing ring 12 is arranged inside the shell 10, and the outer wall of the sealing ring 12 is abutted against the inner wall of the shell 10; the outer edge of the surface cover 20 is inserted into the sealing ring 12, and the surface cover 20 forms an annular sealing cavity with the inner wall of the shell 10 through the sealing ring 12; the winding core 30 is placed in the annular sealing cavity, the upper part and the lower part of the winding core 30 are provided with tabs 31, and the tabs 31 at the lower part are connected with the shell 10; one end surface of the PTC sheet 40 is fixed to the surface cover 20, and the other end surface of the PTC sheet 40 is fixedly connected to the upper tab 31.

This kind of structural design, face lid 20 and sealing washer 12 fixed connection, face lid 20 forms annular seal cavity through the inner wall of sealing washer 12 with casing 10, it places in annular seal cavity to roll up core 30, the upper portion and the lower part of rolling up core 30 all are provided with utmost point ear 31, lower part utmost point ear 31 and casing 10 welding, upper portion utmost point ear 31 is through welding on PTC piece 40, be connected with face lid 20, through increasing PTC piece 40 in the battery is inside, when the battery is inside because reasons such as external force cause the short circuit, the internal resistance of PTC piece (positive temperature coefficient thermistor) increases along with the temperature rise, thereby play the effect of cutting off the current protection battery.

In one embodiment, the surface cover 20 is a positive electrode, the tab 31 in contact with the surface cover 20 is a positive electrode, that is, the housing 10 is a negative electrode, and the tab 31 in contact with the housing 10 is a negative electrode.

In another embodiment, the surface cover 20 is a negative electrode, the tab 31 in contact with the surface cover 20 is a negative electrode, that is, the casing 10 is a positive electrode, and the tab 31 in contact with the casing 10 is a positive electrode.

Referring to fig. 2 and 3, the surface cover 20 is circumferentially provided with a raised portion 21 along a direction away from a vertical axis of the surface cover 20, and the raised portion 21 is inserted into the accommodating groove 1201 of the sealing ring 12 and contacts with an inner wall of the sealing ring 12.

In this way, the tilting portion 21 is integrally formed with the face cover 20, and the tilting portion 21 is inserted into the accommodating groove 1201 of the sealing ring 12, so that the horizontal height of the tilting portion 21 is gradually increased along the direction away from the vertical axis of the face cover 20, water can be prevented from easily entering the casing 10 along the gap between the face cover 20 and the sealing ring 12, and the waterproof effect of the button cell is improved.

Specifically, the included angle α between the tilted portion 21 and the horizontal plane is preferably 15 °, 20 °, or 30 °.

In a specific embodiment, an included angle α between the tilted portion 21 and the horizontal plane is 15 °, which can prevent water from easily entering the housing 10 along a gap between the surface cover 20 and the sealing ring 12, and prevent the problem that the connection between the tilted portion 21 and the surface cover 20 is easily broken due to excessive bending.

Referring to fig. 4, the upper portion of the housing 10 is provided with a fastening edge 11, the upper portion of the fastening edge 11 is abutted against the upper wall of the sealing ring 12, and the lower portion is contacted with the winding core 30. Like this, the lower part of withholding side 11 carries out the joint to rolling up core 30, has realized that roll core 30 can stably place in casing 10, and the upper portion has realized the effect fixed to sealing washer 12 with the upper wall butt of sealing washer 12.

Referring to fig. 3, the upper portion of the pressing edge 11 has a higher level than the cover 20. Therefore, when the button cell is impacted from the front, the problem that the tab 31 inside the shell 10 is extruded due to direct contact with the surface cover 20 can be avoided, and the probability of deformation of the button cell is effectively reduced.

With further reference to fig. 3, the lower end surface of the seal ring 12 abuts the upper end surface of the winding core 30. Thus, the upper part of the sealing ring 12 is abutted against the buckling edge 11, and the lower part is abutted against the winding core 30, so that the sealing ring 12 is fixed, and the stability of the surface cover 20 is improved.

Specifically, the outer wall of the winding core 30 is in contact with the inner wall of the can 10. In this way, the stability of the placement of the winding core 30 is improved.

Specifically, the outer walls of the housing 10 and the face cover 20 are provided with non-metal film layers. Therefore, the non-metal film is plated on the shell and the face cover which are both made of metal materials in a vacuum mode, so that the shell can not be corroded when the battery works, and the battery can be used as a high-voltage version with the nominal voltage of 3.7V, 3.8V and 3.85V.

Specifically, the seal ring 12 is made of an elastic material.

In a preferred embodiment, the sealing ring 12 is made of silicone. Thus, the seal ring 12 can separate the housing 10 from the face cover 20, and thus, an insulating function is achieved.

In another preferred embodiment, the sealing ring 12 is made of TPU.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A button cell battery, comprising:

the sealing device comprises a shell (10), wherein a sealing ring (12) is arranged inside the shell (10), and the outer wall of the sealing ring (12) is abutted against the inner wall of the shell (10);

the outer edge of the surface cover (20) is inserted into the sealing ring (12), and the surface cover (20) forms an annular sealing cavity with the inner wall of the shell (10) through the sealing ring (12);

a winding core (30) placed in the annular sealing cavity, wherein the upper part and the lower part of the winding core (30) are provided with tabs (31), and the lower tab (31) is connected with the shell (10);

the PTC sheet (40), one end face of PTC sheet (40) is fixed face lid (20), another end face and upper portion utmost point ear (31) fixed connection of PTC sheet (40).

2. The button cell battery according to claim 1, wherein the face cover (20) is circumferentially provided with a raised portion (21) along a direction away from a vertical axis of the face cover (20), and the raised portion (21) is inserted into the accommodating groove (1201) of the sealing ring (12) and contacts with an inner wall of the sealing ring (12).

3. The button cell according to claim 2, wherein the angle α between the tilted part (21) and the horizontal plane is 15-30 degrees.

4. Button cell battery according to claim 1, characterized in that the upper part of the casing (10) is provided with a snap (11), the upper part of the snap (11) is in contact with the upper wall of the sealing ring (12) and the lower part is in contact with the winding core (30).

5. Button cell battery according to claim 4, characterized in that the level of the upper part of the snap-on edge (11) is higher than the level of the face cover (20).

6. A button cell according to claim 5, characterized in that the lower end face of the sealing ring (12) abuts the upper end face of the winding core (30).

7. Button cell battery according to claim 1, characterized in that the outer wall of the winding core (30) is in contact with the inner wall of the casing (10).

8. The button cell according to claim 1, characterized in that the outer walls of the housing (10) and the face cover (20) are provided with non-metallic film layers.

9. The button cell according to claim 1, wherein the sealing ring (12) is made of silicone.

10. Button cell battery according to claim 1, characterized in that the sealing ring (12) is of TPU material.