CN212062603U - Button cell and pole group unit - Google Patents

Abstract

The utility model discloses a button cell and utmost point group unit. The pole group unit comprises at least two winding cores, each winding core comprises a positive pole layer, a negative pole layer and a diaphragm clamped between the adjacent positive pole layer and the negative pole layer, and the positive pole layer is provided with a conductor protruding out of the winding core; the winding core comprises a plurality of winding cores, wherein all the winding cores are matched to form a preset shape, the cross section of the preset shape is an axisymmetric pattern, a shared anode body is arranged between the electric conductors of all the winding cores, and the outermost side of each winding core is a cathode layer. Compared with the traditional winding pole group, the pole group unit has smaller internal resistance; and compared with the laminated pole group, the assembling process is simple. The button cell adopts the pole group unit, so that liquid leakage is not easy to occur, the charge-discharge rate performance is improved, and the requirement of electronic products on quick charge is met.

Description

Button cell and pole group unit

Technical Field

The utility model relates to a button cell technical field especially relates to a button cell and utmost point group unit.

Background

At present, the button cell is widely applied to various occasions as a movable power supply and becomes an essential article for life of people.

Conventional button lithium electrode group unit: comprises a shell, a pole group, electrolyte and the like, wherein the pole group has a laminated type and a winding type. The structure assembly process of the prior laminated pole group is very complex, and the expansion of the laminated pole group in the thickness direction can influence the reliability of sealing, so that liquid leakage is easily caused; the traditional winding type pole group can affect the improvement of the charge and discharge rate performance due to the internal structure defects.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a button cell and a pole set unit. Compared with the traditional winding pole group, the pole group unit has smaller internal resistance; and compared with the laminated pole group, the assembling process is simple. The button cell adopts the pole group unit, so that liquid leakage is not easy to occur, the charge-discharge rate performance is improved, and the requirement of electronic products on quick charge is met.

The technical scheme is as follows:

on one hand, the application provides a pole group unit, which comprises at least two winding cores, wherein each winding core comprises a positive pole layer, a negative pole layer and a diaphragm clamped between the adjacent positive pole layer and the negative pole layer, and the positive pole layer is provided with a conductor protruding out of the winding core; the winding core comprises a plurality of winding cores, wherein all the winding cores are matched to form a preset shape, the cross section of the preset shape is an axisymmetric pattern, a shared anode body is arranged between the electric conductors of all the winding cores, and the outermost side of each winding core is a cathode layer.

When the pole group unit is used, at least two winding cores are matched to form a preset shape, the cross section of the preset shape is an axisymmetric figure (namely, the shape of the needed pole group can be flexibly set according to the shape of a button battery), a positive pole body is formed by fixedly connecting electric conductors of all the winding cores, and meanwhile, the negative pole layer is directly or indirectly electrically connected, so that the winding cores are relatively independent and work in parallel, and the internal resistance can be reduced. Compared with the traditional winding pole group, the pole group unit has smaller internal resistance; compared with a laminated pole group, the pole group can be constructed only by combining at least two winding cores, and the assembly process is simple.

The technical solution is further explained below:

in one embodiment, the electric conductors of all the winding cores are welded and fixed, and form an elastic positive electrode body.

In one embodiment, the conductor of one of the winding cores comprises a positive electrode body, a welding body and a spring plate structure arranged between the welding body and the positive electrode body, and the welding body is welded and fixed with the conductors of the other winding cores.

In one embodiment, at least three winding cores are matched to form a preset shape, the cross section of the preset shape is an axisymmetric pattern, and a common anode body is arranged between the electric conductors of all the winding cores.

In one embodiment, the pole group unit further comprises insulated fixing members, and the fixing members are fixedly connected with all the winding cores respectively.

In one embodiment, the fixing member is an insulating tape, all the winding cores are wrapped and fixed by the insulating tape, the free end of the positive electrode body penetrates out of the insulating tape, the negative electrode layer is connected through the current collector, and the free end of the current collector penetrates out of the insulating tape.

On the other hand, the application also provides a button cell, which comprises the pole group unit in any one of the embodiments, and further comprises a cell shell, a cell cover and an insulating sealing ring, wherein the cell shell forms a sealing cavity with the cell cover through the sealing ring, the pole group unit is arranged in the sealing cavity, the anode body is electrically connected with the cell cover, the cathode layer is electrically connected with the cell shell, and electrolyte is stored in the sealing cavity.

The button cell can be flexibly designed according to the requirement of the internal space of the electronic equipment. Specifically, according to the appearance characteristics of the button cell, the shape of the sealing cavity is designed, then at least two winding cores are matched to form a required pole group shape, the electric conductors of all the winding cores are fixedly connected to form a positive pole body and electrically connected with the cell cover, and meanwhile, the negative pole layer is directly or indirectly electrically connected through the cell shell, so that the at least two winding cores are relatively independent in the sealing cavity and are connected in parallel to perform energy conversion, and the internal resistance during energy circulation can be reduced. The button battery adopts the pole group unit, the construction of the pole group is completed by utilizing the relatively independent winding core, and the winding core cannot expand along the axial direction of the winding core, so that the sealing structure cannot be damaged, the sealing cavity is reliably sealed, and liquid leakage is difficult to occur; and at least two winding cores are connected in parallel to work, so that the charge-discharge rate performance is improved, and the requirement of electronic products on quick charge is met.

The technical solution is further explained below:

in one embodiment, the battery shell is provided with a containing cavity, the battery shell comprises an annular bearing body and an extruding body arranged on the bearing body, the bearing body is sleeved outside the containing cavity and arranged at the port of the containing cavity, the battery cover is arranged between the bearing body and the extruding body through the sealing ring, and the extruding body is matched with the bearing body and used for clamping the battery cover and the sealing ring.

In one embodiment, the sealing ring is arranged between the bearing body and the extruding body and forms a groove for wrapping the battery cover.

In one embodiment, the button cell further includes a first insulating pad and a second insulating pad, the first insulating pad is disposed between the electrode assembly unit and the cell cover, and the second insulating pad is disposed between the electrode assembly unit and the bottom wall of the cell housing.

Drawings

FIG. 1 is a schematic half-sectional view of a button cell in one embodiment;

FIG. 2 is a schematic top view of a button cell in one embodiment;

FIG. 3 is a schematic view of a core shown in FIG. 1;

FIG. 4 is a schematic view of another winding core shown in FIG. 1;

FIG. 5 is an enlarged view of part A shown in FIG. 1;

FIG. 6 is an enlarged partial view of B shown in FIG. 1;

fig. 7 is a partially enlarged schematic view of C shown in fig. 1.

Description of reference numerals:

100. a pole group unit; 110. a winding core; 112. a positive electrode layer; 101. an electrical conductor; 103. a positive electrode body; 104. welding a body; 105. a spring plate structure; 114. a negative electrode layer; 116. a diaphragm; 118. a current collector; 200. a battery case; 210. an accommodating chamber; 220. a receiving body; 230. an extrusion body; 300. a battery cover; 400. a seal ring; 410. a groove; 500. a first insulating pad; 600. a second insulating pad.

Description of the drawingsthe accompanying drawings, which form a part of the present application, serve to provide a further understanding of the invention, and the exemplary embodiments and descriptions thereof are provided for purposes of explanation and are not intended to constitute undue limitations on the invention.

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

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Unless defined otherwise, all 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 in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 and 2, in one embodiment, a button cell is provided, which includes a pole group unit 100, a cell housing 200, a cell cover 300, and an insulating sealing ring 400.

As shown in fig. 2 to 5, the pole group unit 100 includes at least two winding cores 110; the winding core 110 comprises a positive electrode layer 112, a negative electrode layer 114 and a diaphragm 116 clamped between the adjacent positive electrode layer 112 and the negative electrode layer 114, the positive electrode layer 112 is provided with a conductor 101 protruding out of the winding core 110, and the outermost side of the winding core 110 is provided with the first negative electrode layer 114; all the winding cores 110 are matched to form a preset shape, the cross section of the preset shape is an axisymmetric figure, and a common anode body 103 is arranged between the electric conductors 101 of all the winding cores 110.

As shown in fig. 1 and 7, the battery case 200 and the battery cover 300 form a sealed cavity through the sealing ring 400, the electrode assembly unit 100 is disposed in the sealed cavity, the positive electrode body 103 is electrically connected to the battery cover 300, the negative electrode layer 114 is electrically connected to the battery case 200, and the electrolyte is stored in the sealed cavity.

The button cell can be flexibly designed according to the requirement of the internal space of the electronic equipment. Specifically, according to the appearance characteristics of the button cell, the shape of the sealed cavity is designed, then at least two winding cores 110 are matched to form a required electrode group shape, the electric conductors 101 of all the winding cores 110 are fixedly connected to form a positive electrode body 103 and are electrically connected with the cell cover 300, and meanwhile, the negative electrode layer 114 is directly or indirectly electrically connected through the cell shell 200, so that the winding cores 110 are relatively independent in the sealed cavity and work in parallel to perform energy conversion, and the internal resistance during energy circulation can be reduced. The button battery adopts the pole group unit 100, the construction of the pole group is completed by utilizing the relatively independent winding core, and the winding core 110 cannot expand along the axial direction of the pole group, so that the sealing structure cannot be damaged, the sealing of a sealing cavity is reliable, and liquid leakage is difficult to occur; meanwhile, the parallel connection work of at least two winding cores 110 is utilized, so that the charge-discharge rate performance is improved, and the requirement of electronic products on quick charge is met.

The "positive electrode body" is a common conductor, which may be formed during the process of electrically connecting one conductor 101 to another conductor 101, or may be disposed on one conductor 101, and the conductor 101 is electrically connected to another conductor 102 for common conduction.

In the present application, "pole group unit 100" is an abbreviation of a combination having a pole group function.

The sealing ring 400 may be a shaped sealing element, or may be formed by coating a sealant, and the specific implementation process is not described herein.

It should be noted that the cross section of the "core 110" includes, but is not limited to, a semi-circle, a polygon, a semi-ellipse, etc.; correspondingly, the cross section of the pole group unit 100 includes, but is not limited to, a circle, a polygon, an ellipse, etc.

The "jellyroll 110" is made using a winding needle having a cross-sectional shape including, but not limited to, semi-circular, polygonal, semi-elliptical.

Such polygons include, but are not limited to, triangles, quadrilaterals, pentagons, and the like.

In addition to any of the above embodiments, as shown in fig. 1 and 2, in one embodiment, all the conductors 101 of the winding core 110 are welded and fixed, and the positive electrode body 103 having elasticity is formed. Therefore, the elastic positive electrode body 103 is convenient to elastically abut against the battery cover 300, so that the connection between the positive electrode body 103 and the battery cover 300 is more reliable. Further, the positive electrode body 103 elastically abuts against the battery cover 300, so that the welding and fixing are facilitated, and the welding and fixing reliability is improved.

The shape of the solder generated by the soldering and fixing of the conductors 101 is triangular, rectangular, circular, or the like, or the generated solder spots are single-point, two-point, three-point, four-point, multi-point, linear, cross-shaped, or the like.

Further, the pole group unit 100 is fixed to the battery case 200 or/and the battery cover 300 by resistance welding, ultrasonic welding, or laser welding. The welding shape formed by ultrasonic welding is in a single-point shape, a plurality of point shapes (more than 2 points), a triangular shape, a rectangular shape and a circular shape; the welding spots formed by laser welding have single point, two points, three points, four points and multiple points, straight line shape, cross shape and the like; the shape of the weld formed by resistance welding is circular, triangular, rectangular, etc

Further, as shown in fig. 1 and fig. 3, in an embodiment, the conductor 101 of one winding core includes a positive electrode body 103, a welding body 104, and a spring structure 105 disposed between the welding body 104 and the positive electrode body 103, and the welding body 104 is welded and fixed to the conductors 101 of the other winding cores 110. In this way, the welding body 104 is welded and fixed to the conductor 101 of the other winding core 110, and then the positive electrode body 103 has certain elasticity by the bent spring structure 105, which is beneficial to realize the elastic contact between the positive electrode body 103 and the battery cover 300.

On the basis of any of the above embodiments, in an embodiment, at least three winding cores 110 are matched to form a preset shape, the cross section of the preset shape is an axisymmetric pattern, and a common positive electrode body is arranged between the conductors 101 of all the winding cores 110. Therefore, the pole group unit 100 can also obtain more shapes by matching at least three winding cores 120, and the winding cores are further connected in parallel, which is beneficial to further reducing the internal resistance of the pole group unit 100.

In addition to any of the above embodiments, in an embodiment, the pole group unit 100 further includes insulating fixing members (not shown), and the fixing members are respectively fixedly connected to all the winding cores 110. Thus, the winding core 110 is fixed into a whole by the fixing member, which is beneficial to improving the integrity and reliability of the pole group unit 100, so that the connection between the winding cores 110 is more reliable.

Further, in an embodiment, the fixing member is an insulating tape, all the winding cores 110 are wrapped and fixed by the insulating tape, the free end of the positive electrode body 103 penetrates out of the insulating tape, the negative electrode layer is connected through the current collector 118, and the free end of the current collector 118 penetrates out of the insulating tape. Therefore, all the winding cores 110 are tightly bound by the insulating tape to form a whole, so that the pole group unit 100 can be assembled in a modularized manner, and the assembly efficiency of the button cell can be improved. In the process, the positive electrode body 103 and the current collector 118 can both penetrate through the insulating tape, and the electrode leading-out of the electrode group unit 100 is not affected.

The "current collector 118" is a metal foil, including but not limited to a copper foil, an aluminum foil, and the like.

The insulating tape includes, but is not limited to, an adhesive tape, etc.

Alternatively, as shown in fig. 1 and 6, in any of the above embodiments, the positive electrode layer 112 may form the positive electrode body 103 by using the current collector 118, and the negative electrode layer 114 may be connected by using the current collector 118.

On the basis of any of the above embodiments, as shown in fig. 1 and fig. 7, in an embodiment, the battery case 200 is provided with an accommodating cavity 210, the battery case 200 includes an annular receiving body 220 and a pressing body 230 disposed on the receiving body 220, the receiving body 220 is sleeved outside the accommodating cavity 210 and disposed at a port of the accommodating cavity 210, the battery cover 300 is disposed between the receiving body 220 and the pressing body 230 through a sealing ring 400, and the pressing body 230 is matched with the receiving body 220 for clamping the battery cover 300 and the sealing ring 400.

When the button cell is assembled, the receiving body 220 and the extruding body 230 can be formed at the port of the shell, then the shaped sealing ring 400 is placed on the receiving body 220, or the sealing glue is coated on the receiving body 220 to form the sealing ring 400, then the cell cover 300 is arranged on the sealing ring 400, at the moment, the cell cover 300 can be pressed and fixed on the receiving body 220 only by bending the extruding body 230, and the cell cover 300 is used for sealing the accommodating cavity 210 by using the sealing ring 400, so that the button cell material can be sealed and stored in the sealing cavity. It will be appreciated that the sealing arrangement of the housing is provided at the port of the capsule, simplifying the associated process. Compared with the prior art, the sealing ring 400 does not need to extend into the accommodating cavity 210 and the side wall of the sealing cavity in a large amount for fitting, occupies the space of the sealing cavity, is beneficial to fully utilizing the sealing cavity to store the electrode group unit 100 and electrolyte, can seal more button cell materials under the same condition, and is beneficial to improving the performance of the button cell.

On the basis of any of the above embodiments, as shown in fig. 7, in an embodiment, the sealing ring 400 is disposed between the receiving body 220 and the pressing body 230, and forms a groove 410 for wrapping the battery cover 300. The groove 410 is used for wrapping the battery cover 300, the bearing body 220 is used for forming a first sealing contact with the battery cover 300, and then the pressing body 230 is used for forming a second sealing contact with the battery cover 300, so that the sealing reliability between the battery shell 200 and the battery cover 300 is further improved. Compared with the prior art, the mode can greatly improve the tightness of the button cell, so that the reliability of the button cell is higher.

Further, in one embodiment, the battery cover 300 is disposed against the bottom wall of the recess 410. Thus, the side surface of the battery cover 300 and the bottom wall of the groove 410 are further utilized to form a third seal, so that the sealing effect between the battery shell 200 and the battery cover 300 is further improved, the battery cover 300 is wrapped by the sealing ring 400 and is pressed by the receiving body 220 and the pressing body 230, and a compact sealing structure is formed between the battery shell 200 and the battery cover 300.

In addition to any of the above embodiments, as shown in fig. 1 and 7, in an embodiment, the button cell further includes a first insulating pad 500 and a second insulating pad 600, the first insulating pad 500 is disposed between the electrode assembly unit 100 and the cell cover 300, and the second insulating pad 600 is disposed between the electrode assembly unit 100 and the bottom wall of the cell housing 200. Thus, the first insulating pad 500 and the second insulating pad 600 are utilized to reliably arrange the pole group unit 100 in the sealed cavity, thereby avoiding the occurrence of short circuit; meanwhile, the first insulating pad 500 and the second insulating pad 600 facilitate the elastic pressing and fixing of the pole group unit 100 between the battery case 200 and the battery cover 300, so that the pole group unit 100 is more firmly fixed.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is considered as "fixed transmission connection" with another element, the two elements may be fixed in a detachable connection manner or in an undetachable connection manner, and power transmission can be achieved, such as sleeving, clamping, integrally-formed fixing, welding and the like, which can be achieved in the prior art, and is not cumbersome. When an element is perpendicular or nearly perpendicular to another element, it is desirable that the two elements are perpendicular, but some vertical error may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A pole group unit, comprising:

the winding core comprises a positive electrode layer, a negative electrode layer and a diaphragm clamped between the adjacent positive electrode layer and the negative electrode layer, and the positive electrode layer is provided with a conductor protruding out of the winding core; all the roll cores are matched to form a preset shape, the cross section of the preset shape is an axisymmetric pattern, a shared anode body is arranged between the electric conductors of the roll cores, and the outermost side of the roll core is the cathode layer.

2. The pole group unit according to claim 1, wherein the electric conductors of all the winding cores are welded and fixed, and the positive pole body having elasticity is formed.

3. The pole group unit according to claim 2, wherein the conductor of one of the winding cores includes the positive electrode body, a welded body, and a spring plate structure provided between the welded body and the positive electrode body, and the welded body is welded and fixed to the conductors of the other winding cores.

4. The pole group unit of claim 1, wherein at least three of the winding cores cooperate to form a predetermined shape having a cross-section in an axisymmetric pattern, and wherein the common positive electrode body is disposed between the conductors of all of the winding cores.

5. The pole group unit according to any one of claims 1 to 4, further comprising an insulating fixing member fixedly connected to all the winding cores, respectively.

6. The pole group unit of claim 5, wherein the fixing member is an insulating tape, all the winding cores are wrapped and fixed by the insulating tape, the free end of the positive pole body penetrates through the insulating tape, the negative pole layer is connected by a current collector, and the free end of the current collector penetrates through the insulating tape.

7. A button cell, comprising the pole group unit as claimed in any one of claims 1 to 6, further comprising a cell housing, a cell cover and an insulating sealing ring, wherein the cell housing forms a sealing cavity with the cell cover through the sealing ring, the pole group unit is disposed in the sealing cavity, the positive pole body is electrically connected with the cell cover, the negative pole layer is electrically connected with the cell housing, and an electrolyte is stored in the sealing cavity.

8. The button cell according to claim 7, wherein the cell housing has a receiving cavity, the cell housing includes an annular receiving body and a pressing body disposed on the receiving body, the receiving body is sleeved outside the receiving cavity and disposed at a port of the receiving cavity, the cell cover is disposed between the receiving body and the pressing body through the sealing ring, and the pressing body is engaged with the receiving body for clamping the cell cover and the sealing ring.

9. The button cell according to claim 8, wherein the sealing ring is disposed between the receiving body and the pressing body and forms a groove for wrapping the cell cover.

10. The button cell according to any one of claims 7 to 9, further comprising a first insulating pad and a second insulating pad, wherein the first insulating pad is disposed between the electrode assembly unit and the cell cover, and the second insulating pad is disposed between the electrode assembly unit and the bottom wall of the cell case.

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