CN215988958U

CN215988958U - Button cell

Info

Publication number: CN215988958U
Application number: CN202121327417.0U
Authority: CN
Inventors: 常海涛; 李云星
Original assignee: Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian
Current assignee: Nanfu New Energy Technology Co ltd Yanping District Nanping Fujian
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2022-03-08
Anticipated expiration: 2031-06-15

Abstract

The utility model discloses a button cell, which comprises a shell, a cover plate and a cell. The top of the housing has an opening, and the middle of the bottom wall of the housing is configured as an inner protrusion protruding toward the opening, so that the inner protrusion forms a first groove on the outside of the housing. The cover plate covers the opening to form a containing space between the cover plate and the shell. The battery cell is arranged in the accommodating space and is provided with a central channel. Wherein the inner protrusion extends at least partially into the central channel to support the cell. According to the button cell, the battery cell is supported by the inner convex part, so that a central tube which is specially arranged to penetrate through a central channel of the battery cell is omitted, the cost is reduced, the production process is simplified, and the production efficiency is improved.

Description

Button cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a button cell.

Background

At present, some button batteries adopt a winding battery core, and a central tube needs to be arranged to penetrate through the winding battery core to support the winding battery core.

However, this method has many parts, resulting in complex process, high cost and low production efficiency.

Therefore, a button cell battery is needed to at least partially solve the above problems.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content of the present invention is not intended to define key features or essential features of the claimed solution, nor is it intended to be used to limit the scope of the claimed solution.

To at least partially solve the above problems, the present invention provides a button cell including:

the top of the shell is provided with an opening, and the middle part of the bottom wall of the shell is configured as an inner convex part protruding towards the opening, so that the inner convex part forms a first groove on the outer side of the shell;

a cover plate covering the opening to form an accommodating space between the cover plate and the housing;

the battery cell is arranged in the accommodating space and is provided with a central channel;

wherein the inner protrusion extends at least partially into the central channel to support the cell.

According to the button cell, the battery cell is supported by the inner convex part, so that a central tube which is specially arranged to penetrate through a central channel of the battery cell is omitted, the cost is reduced, the production process is simplified, and the production efficiency is improved.

Further, the inner protrusion extends to the cover plate and is spaced apart from the cover plate. Therefore, the stability of the cell support can be improved.

Further, the button cell also comprises an insulating pad which is arranged on the top of the inner convex part and is clamped by the inner convex part and the cover plate;

the battery cell is provided with a positive electrode lug and a negative electrode lug, the positive electrode lug and the negative electrode lug are both far away from the bottom of the shell and are respectively arranged on the edges of the insulation pads, the height directions of the two sides of the button battery are opposite, so that one of the positive electrode lug and the negative electrode lug is connected to the cover plate, and the other one of the positive electrode lug and the negative electrode lug is connected to the inner convex part of the shell. According to the scheme, the positive pole lug and the negative pole lug can be arranged on the same side, and the positive pole lug and the negative pole lug are tightly pressed by the insulating pad, so that the possibility of breakage of the electrode plate and/or the pole lug in the electric circulation process of the battery cell can be reduced.

Further, the battery cell further comprises:

the positive electrode tab is connected to the positive electrode current collector; and

the negative pole tab is connected to the negative pole current collector;

wherein, the anodal mass flow body with the negative pole mass flow body all set up in the middle part of electric core, just anodal utmost point ear with negative pole utmost point ear forms the contained angle, the contained angle is greater than 0 and is less than or equal to 180. According to this scheme, be convenient for utmost point ear and electric core main part contactless when bending to the center, reduce the short circuit risk, improved the security performance.

Further, the inner protrusion includes a flange disposed circumferentially at a top of the inner protrusion to form a second groove, and the insulating pad is disposed in the second groove. Thereby, the insulating pad can be stably fixed.

Further, a notch is formed in the side face of the flange, and one of the positive electrode tab and the negative electrode tab extends to the bottom of the insulating pad through the notch.

Further, the cover plate includes:

the middle part of the main body is provided with a first counter bore;

the appearance of the insulating part is matched with the first counter bore, the insulating part is lapped to the platform of the first counter bore, and a second counter bore is arranged in the middle of the insulating part; and

the shape of the electrode column is matched with the second counter bore, the electrode column is overlapped to the second counter bore, so that the main body and the electrode column are separated by the insulating part, and the middle of the electrode column faces the direction of the shell and is sunken to form a third groove.

Furthermore, a step part is formed on the periphery of the cover plate, and the step surface of the step part faces downwards, so that when the cover plate covers the shell, the top end of the shell wall of the shell is abutted to the step surface.

Furthermore, the distance between the plane where the top end of the inner convex part is located and the plane where the top end of the side wall of the shell is located is 0.5-1.0 mm.

Further, when the insulating pad is not mounted, the distance from the top of the inner protrusion to the bottom surface of the cap plate is 30% to 50% less than the thickness of the insulating pad.

Further, the depth of the second groove is 0.2 mm-0.5 mm.

Further, the width of the notch is 0.5 mm-1.0 mm larger than the width of the positive electrode tab or the negative electrode tab.

Drawings

The following drawings of the utility model are included to provide a further understanding of the utility model. The drawings illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model.

In the drawings:

fig. 1 is a schematic cut-away view of a button cell according to a preferred embodiment of the utility model;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a schematic top view at the inner lug of a button cell according to a preferred embodiment of the utility model; and

fig. 4 is a schematic top view at the inner protrusion of a button cell according to another preferred embodiment of the present invention.

Description of reference numerals:

100: the button cell 110: the housing 111: inner convex part

112: first groove 113: insulating pad 114: second groove

115: notch 116: bottom wall 117: side wall

118: the accommodation space 119: flange 120: cover plate

121: main body 122: insulating part 123: electrode column

124: step 130: the battery cell 131: positive plate

132: negative electrode tab 133: diaphragm 134: positive pole ear

135: negative electrode tab 136: positive electrode current collector 137: negative current collector

125: third groove

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the utility model.

In the following description, a detailed description will be given in order to thoroughly understand the present invention. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. It is apparent that the implementation of the embodiments of the utility model is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the utility model, however, the utility model is capable of other embodiments in addition to those detailed.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Ordinal words such as "first" and "second" are referred to herein merely as labels, and do not have any other meaning, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".

It is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used herein for purposes of illustration only and are not limiting.

An exemplary embodiment according to the present invention will now be described in more detail with reference to fig. 1 to 4.

Referring first to fig. 1, a button cell battery 100 according to a preferred embodiment of the present invention is shown, which includes a case 110, a cap plate 120, and a cell 130. The housing 110 has an opening at the top thereof, and a cover plate 120 covers the opening to form a receiving space 118 therebetween. The battery cell 130 is disposed in the accommodation space 118.

With continued reference to fig. 1, the structure of the cover plate 120 includes a main body 121, an insulating portion 122, and an electrode column 123. Wherein the insulating part 122 is disposed between the main body 121 and the electrode column 123 to insulate and separate them. So that the electrode column 123 can be charged without charging the body 121.

Specifically, the middle of the body 121 is provided with a first counterbore. The insulation portion 122 is disposed at the first counterbore and lapped on the platform of the first counterbore. The contour of the insulation 122 is adapted to the shape of the first counterbore. The middle of the insulating part 122 is provided with a second counter bore, and the electrode column 123 is arranged at the second counter bore and is lapped on the platform of the second counter bore. The electrode column 123 is contoured to accommodate the first counterbore. So that the insulating part 122 separates the body 121 and the electrode column 123, and the middle part of the electrode column 123 is recessed toward the housing 110 to form a third groove 125 (shown in fig. 2). Alternatively, the top of the electrode shaft 123 is formed in a "concave" configuration to facilitate positioning and installation during use of the battery.

The cover plate 120 may have a stepped surface 124 formed on the periphery thereof. When the cover plate 120 covers the housing 110, the top end of the wall of the housing 110 can abut against the step surface, so as to form a tight fit, thereby achieving a reliable seal.

In an alternative embodiment, the cell 130 may be a wound cell 130. The wound cell 130 includes a positive electrode sheet 131, a negative electrode sheet 132, and a separator 133, which are formed through a winding process, and a central passage is formed at the center of the wound cell 130. The exterior of the cell 130 may also be wrapped with a layer of termination tape (not shown) to avoid short-circuiting the contact of the cell 130 with the housing 110.

The middle of the bottom wall 116 of the housing 110 extends toward the opening direction to form an inner protrusion 111, so that the inner protrusion 111 forms a first groove 112 at the outer side of the housing 110. And, the inner protrusion 111 extends at least partially into the central channel, thereby supporting the cell 130. Preferably, the inner protrusion 111 may extend to the cover plate 120 and be spaced apart from the cover plate 120, forming a more stable support while preventing the inner protrusion 111 from contacting the cover plate 120 to cause a short circuit. Alternatively, the inner protrusion 111 extends through the central channel of the cell 130. Illustratively, the distance between the plane of the top end of the inner protrusion 111 and the plane of the top end of the side wall 117 of the housing 110 is preferably 0.5-1.0 mm. The inner protrusion 111 may be formed by a drawing process or a molding process.

According to the button cell 100 disclosed by the utility model, the battery cell 130 is supported by the inner convex part 111, so that a central tube which is specially arranged to penetrate through a central channel of the battery cell 130 is omitted, the cost is reduced, the production process is simplified, and the production efficiency is improved.

Further, refer to fig. 1 and 2. The top of the inner protrusion 111 is provided with an insulating pad 113, which is sandwiched by the inner protrusion 111 and the cover plate 120. Or it is held by the housing 110 and the cover plate 120. A positive electrode tab 134 and a negative electrode tab 135 are respectively led out from the positive electrode tab 131 and the negative electrode tab 132 and are away from the bottom of the case 110. The upper ends of the positive and

negative electrode tabs

134 and 135 are bent inward, respectively, and are disposed on opposite sides of the insulating gasket 113 in the height direction of the button cell 100, respectively, such that one of the positive and

negative electrode tabs

134 and 135 is connected to the cap plate 120 and the other is connected to the inner protrusion 111 of the case 110.

Preferably, a positive tab 134 is located above the insulating pad 113, which is connected to the electrode shaft 123, such that the electrode shaft 123 forms a positive electrode. A negative electrode tab 135 is located below the insulating pad 113, and is connected to the inner protrusion 111, making the case 110 a negative electrode. Also, a certain compression rate can be given to the insulating mat 113. For example, when the insulating pad 113 is not mounted, the distance from the top of the inner protrusion 111 to the bottom surface of the cap plate 120 is 30% to 50% smaller than the thickness of the insulating pad 113. I.e. the mounted insulating mat 113 is compressed by 30-50%. Thereby, the positive electrode tab 134 and the negative electrode tab 135 can be pressed against the lid plate 120 and the case 110, respectively, by the insulating gasket 113. In addition, in order to further improve the fixing firmness of the cathode tab 134 and the anode tab 135, the cathode tab 134 and the anode tab 135 may be bonded to the insulation pad 113 when the cathode tab 134 and the anode tab 135 are manufactured, or the cathode tab 134 and the anode tab 135 may be bonded to the insulation pad 113 when the insulation pad 113 is assembled.

In an alternative embodiment, the cell 130 further has a positive current collector 136 and a negative current collector 137. Wherein the positive tab 134 is connected to the positive tab 131 via a positive current collector 136, and the negative tab 135 is connected to the negative tab 132 via a negative current collector 137. In this case, it is necessary to dispose both the positive electrode collector 136 and the negative electrode collector 137 near the center. Namely, the positive electrode current collector 136 and the negative electrode current collector 137 are both arranged close to the inner convex part 111, so that the tabs are not in contact with the battery cell 130 main body 121 when being bent towards the center, the short circuit risk is reduced, and the safety performance is improved. Alternatively, the positive current collector 136 and the positive tab 134 may be one or the same piece, and the negative current collector 137 and the negative tab 135 may be one or the same piece.

Preferably, the positive electrode tab 134 and the negative electrode tab 135 are bent to form an included angle therebetween. For example, the angle between the two is greater than 0 ° and less than or equal to 180 °. More preferably, the included angle between the positive electrode tab 134 and the negative electrode tab 135 is greater than 30 ° and less than or equal to 150 °, and further preferably, 180 ° is provided between the positive electrode tab 134 and the negative electrode tab 135. Therefore, the positive electrode tab 134 and the negative electrode tab 135 are arranged on the same side and form an included angle of 180 degrees, so that the possibility of breakage of the electrode tabs and/or the electrode tabs in the electrical circulation process of the battery cell 130 can be reduced.

Please refer to fig. 2, fig. 3 and fig. 4. The top of the inner protrusion 111 is preferably provided with a circumferentially extending flange 119 to enclose the second groove 114, and the depth thereof is preferably 0.2mm to 0.5mm, so that the insulating pad 113 can be stably disposed in the second groove 114. Preferably, the flange 119 is provided at a side thereof with a notch 115, and the width of the notch 115 is 0.5mm to 1.0mm greater than that of the positive or

negative electrode tab

134 or 135, thereby enabling the negative electrode tab 135 to extend to the bottom of the insulating mat 113 through the notch 115.

Wherein the cross-sectional shape of the insulating pad 113 is adapted to the cross-sectional shape of the second groove 114. The insulating pad 113 may be circular (shown in fig. 3) or square (shown in fig. 4).

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the utility model to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A button cell battery, comprising:

a cover plate covering the opening to form an accommodating space between the cover plate and the housing; and

2. The button cell according to claim 1, wherein the inner protrusion extends to the cover plate and is spaced apart from the cover plate.

3. The button cell according to claim 2, further comprising an insulating pad disposed on top of the inner protrusion and clamped by the inner protrusion and the cover plate;

the battery cell is provided with a positive electrode lug and a negative electrode lug, the positive electrode lug and the negative electrode lug are both far away from the bottom of the shell and are respectively arranged on the edges of the insulation pads, the height directions of the two sides of the button battery are opposite, so that one of the positive electrode lug and the negative electrode lug is connected to the cover plate, and the other one of the positive electrode lug and the negative electrode lug is connected to the inner convex part of the shell.

4. The button cell battery according to claim 3, wherein the cell further comprises:

the negative pole tab is connected to the negative pole current collector;

wherein, the anodal mass flow body with the negative pole mass flow body all set up in the middle part of electric core, just anodal utmost point ear with negative pole utmost point ear forms the contained angle, the contained angle is greater than 0 and is less than or equal to 180.

5. The button cell according to claim 3, wherein the inner protrusion comprises a flange disposed circumferentially at the top of the inner protrusion to form a second groove, the insulating pad being disposed within the second groove.

6. The button cell according to claim 5, wherein the flange is provided with a notch on a side thereof, and one of the positive electrode tab and the negative electrode tab extends to the bottom of the insulating pad through the notch.

7. The button cell according to any one of claims 1 to 6, wherein the cover plate comprises:

the middle part of the main body is provided with a first counter bore;

8. The button cell according to any one of claims 1 to 6, wherein the peripheral edge of the cover plate forms a step, the step of the step faces downward, so that when the cover plate covers the case, the top end of the wall of the case abuts against the step.

9. The button cell according to any one of claims 1-6, wherein the distance between the plane of the top end of the inner convex part and the plane of the top end of the side wall of the housing is 0.5-1.0 mm.

10. The button cell according to any one of claims 3 to 6, wherein the distance from the top of the inner protrusion to the bottom surface of the cap plate is 30 to 50% less than the thickness of the insulating pad when the insulating pad is not mounted.

11. The button cell according to claim 5 or 6, wherein the depth of the second groove is 0.2mm to 0.5 mm.

12. The button cell according to claim 6, wherein the width of the notch is 0.5mm to 1.0mm larger than the width of the positive electrode tab or the negative electrode tab.