CN217881805U

CN217881805U - Button cell positive pole cover

Info

Publication number: CN217881805U
Application number: CN202221629338.XU
Authority: CN
Inventors: 伊良熺; 余佑锋; 谢道生; 林玉霜
Original assignee: Fujian Nanping Ruisheng New Energy Technology Co ltd
Current assignee: Fujian Nanping Ruisheng New Energy Technology Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-11-22
Anticipated expiration: 2032-06-28

Abstract

The utility model provides a button cell positive pole cover, it is the tubular structure who has a bottom, the top of positive pole cover opens the setting, the top edge of the perisporium of positive pole cover along its circumference set firmly a radial outside protrusion in the annular boss of positive pole cover. When the battery is assembled, the inner cavity of the button cell positive electrode cover is usually filled with a positive electrode cake, and the positive electrode cake expands outwards along with the intercalation of lithium ions during the discharge of the battery. The utility model can avoid the reduction of the current collecting effect of the positive pole cover and the influence on the battery performance caused by the expansion of the positive pole piece; in addition, when the positive electrode cake of the button cell assembled by the positive electrode cover of the button cell expands radially outwards, the annular boss of the positive electrode cover can prop against the inner peripheral wall of the cell shell, so that the effect of preventing the positive electrode cake from expanding radially is better.

Description

Button cell positive pole cover

Technical Field

The utility model relates to a battery part field especially relates to a anodal cover of button cell.

Background

The conventional button cell structure comprises a positive electrode shell, a negative electrode cover, a positive electrode plate, a negative electrode plate and a diaphragm, wherein the positive electrode shell and the negative electrode cover are both in a cylindrical shape with only one end open, the positive electrode shell and the negative electrode cover are oppositely buckled to form a shell of the button cell, and a sealing ring is embedded between the positive electrode shell and the negative electrode cover; the positive plate is attached to the inner side of the bottom surface of the positive shell, the diaphragm is laid on the positive plate, and the negative plate is stacked on the diaphragm and is in contact with the bottom surface of the negative cover. To prevent the positive electrode plate from expanding outward, the positive electrode plate is usually coaxially fitted into an inner cavity of a cylindrical positive electrode cover.

An annular cavity is usually reserved between the outer peripheral wall of a positive electrode cover and the inner peripheral wall of a battery shell in the conventional button battery, and free electrolyte is stored in the annular cavity to be timely supplemented in the discharging process of the battery; in addition, in order to facilitate the insertion of the positive plate, the upper edge of the positive cover is generally lower than the top surface of the positive plate, so that a distance is left between the upper edge of the positive cover and the lower surface of the diaphragm. However, when the positive plate expands outwards along with the insertion of lithium ions during the discharge of the battery, due to the blocking of the positive cover, the positive plate expands axially towards one end of the diaphragm and can pass between the upper edge of the positive cover and the lower surface of the diaphragm, and then expands towards the annular cavity between the outer peripheral wall of the positive cover and the inner peripheral wall of the battery shell, even a part of crushed positive material falls down to the bottom of the annular cavity between the outer peripheral wall of the positive cover and the inner peripheral wall of the battery shell, so that the flow collecting effect of the flow collecting cover is reduced, and meanwhile, the utilization rate of positive active materials is influenced, and the performance of the battery is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a button cell positive pole cover, which can support the overflowed positive pole cake on the upper surface of the ring-shaped boss when the positive pole cake expands upwards in the axial direction and then outwards in the radial direction to overflow the positive pole cover, and can still play the role of collecting current for the positive pole cake overflowed the positive pole cover, and the current collecting effect is better; the annular boss is beneficial to positioning the positive pole cover when the positive pole cover is arranged in the battery shell; in addition, by button cell that button cell positive pole cover equipment formed when the radial outside inflation of positive pole cake the annular boss of positive pole cover can withstand the internal perisporium of battery case, consequently, prevent that positive pole cake radial inflation's effect is also better to can avoid the positive plate inflation to lead to the mass flow effect of positive pole cover to descend and influence battery performance.

The positive pole cover of the button cell is of a cylindrical structure with a bottom, the top end of the positive pole cover is arranged in an open mode, and an annular boss protruding out of the positive pole cover in the radial direction is fixedly arranged on the upper edge of the peripheral wall of the positive pole cover along the circumferential direction of the peripheral wall of the positive pole cover.

When the battery is assembled, the inner cavity of the button cell positive electrode cover is usually filled with a positive electrode cake, and the positive electrode cake expands outwards along with the intercalation of lithium ions during the discharge of the battery.

The utility model discloses a button cell positive pole cover is through set firmly one along its circumference at the top edge of the perisporium of positive pole cover and radially outwards bulge in the annular boss of positive pole cover, make when positive cake expands outward in the radial direction again earlier the axial, the upper surface of annular boss can hold the positive pole cake that overflows, still can play the mass flow effect to the positive pole cake that overflows the positive pole cover, and the mass flow effect is better; the annular boss is beneficial to positioning the positive pole cover when the positive pole cover is arranged in the battery shell; in addition, when the button cell assembled by the button cell positive pole cover expands radially outwards, the annular boss of the positive pole cover can prop against the inner peripheral wall of the cell shell, so that the effect of preventing the positive pole cake from expanding radially is better.

Preferably, a plurality of electrolyte through holes are formed in the annular boss located on the radially outer side of the anode casing. Furthermore, all the electrolyte via holes are uniformly arranged at intervals along the circumferential direction of the annular boss.

Preferably, the annular boss and the positive electrode cover are integrally formed.

Preferably, when the battery is assembled, a positive electrode cake is coaxially accommodated in an inner cavity of the positive electrode cover, the bottom surface of the positive electrode cake is attached to the inner surface of the bottom wall of the positive electrode cover, the positive electrode cake and the positive electrode cover are coaxially placed in a cylindrical battery case formed by assembling a positive electrode case, a negative electrode case and a sealing ring together, the positive electrode case and the negative electrode case are both cylindrical, only one end of each of the positive electrode case and the negative electrode case is open, the positive electrode case and the negative electrode case are buckled with each other, and the sealing ring is positioned between the positive electrode case and the negative electrode case and seals a gap between the positive electrode case and the negative electrode case; the outer bottom surface of the positive electrode cover is attached to the inner bottom surface of the positive electrode shell; a negative plate is attached to the inner bottom surface of the negative shell; a diaphragm is arranged between the positive electrode cake and the negative electrode plate and is separated from the positive electrode cake and the negative electrode plate by the diaphragm; an annular cavity is formed between the positive pole cover and the inner peripheral wall of the battery shell, and the annular boss extends outwards in the radial direction to the upper side of the annular cavity. Further, when the outer periphery of the diaphragm is bent downwards at the inner peripheral wall of the battery shell and extends downwards along the inner peripheral wall of the battery shell and is inserted into the annular cavity, the annular boss extends outwards in the radial direction to the inner peripheral wall of the diaphragm. When the outer periphery of the diaphragm is positioned above the annular cavity and is not inserted into the annular cavity, the annular boss extends outwards in the radial direction to the inner peripheral wall of the battery shell. Because the annular boss is abutted against the inner circumferential wall of the battery shell in the radial direction, the effect of preventing the positive electrode cake from expanding in the radial direction is better.

Drawings

Fig. 1 is a schematic longitudinal sectional view of the positive electrode cover of the button cell of embodiment 1 and the button cell assembled by using the same;

fig. 2 is a schematic bottom structural view of the positive cover of the button cell of embodiment 1;

fig. 3 is a schematic longitudinal sectional view of the positive electrode cover of the button cell of embodiment 2 and the button cell assembled by using the same.

Detailed Description

The preferred embodiment of the positive cover of button cell battery of the present invention will be described in detail with reference to the accompanying drawings:

example 1

With reference to fig. 1 and fig. 2, a positive electrode cover 10 of a button cell is a cylindrical structure with a bottom 11, the top end of the positive electrode cover 10 is open, and an annular boss 20 protruding radially outward from the positive electrode cover 10 is fixedly arranged along the circumferential direction of the upper edge of a circumferential wall 12 of the positive electrode cover 10;

in embodiment 1, the button cell is further assembled by using the button cell positive electrode cover, when the cell is assembled, a positive electrode cake 30 is coaxially accommodated in an inner cavity of the positive electrode cover 10, a bottom surface of the positive electrode cake 30 is attached to an inner surface of a bottom wall 11 of the positive electrode cover 10, the positive electrode cake 30 and the positive electrode cover 10 are coaxially placed in a columnar cell case 40 formed by assembling a positive electrode case 41, a negative electrode case 42 and a sealing ring 43, the positive electrode case 41 and the negative electrode case 42 are both in a cylindrical shape with only one open end, the positive electrode case 41 and the negative electrode case 42 are oppositely buckled, and the sealing ring 43 is located between the positive electrode case 41 and the negative electrode case 42 and seals a gap between the positive electrode case 41 and the negative electrode case 42; the outer bottom surface of the positive electrode cover 10 is attached to the inner bottom surface of the positive electrode shell 41; a negative plate 50 is attached to the inner bottom surface of the negative shell 42, and a diaphragm 60 is arranged between the positive electrode cake 30 and the negative plate 50 and is separated from the positive electrode cake and the negative plate 50 by the diaphragm 60; an annular cavity 70 is formed between the positive electrode cover 10 and the inner peripheral wall of the battery shell 40, and the annular boss 20 extends radially outwards to be above the annular cavity 70; wherein, the outer periphery of the diaphragm 60 is bent downward at the inner periphery of the battery case 40 and extends downward along the inner periphery of the battery case 40, and is inserted into the annular cavity 70, and the annular boss 20 extends outward in the radial direction to the inner periphery of the diaphragm 60.

Example 2

The button cell positive electrode cover 10 of example 2 differs from example 1 in that: when the battery is assembled, the outer periphery of the diaphragm 60 is located above the annular cavity 70 without being inserted into the annular cavity 70, and the annular boss 20 extends radially outward to the inner peripheral wall of the battery case 40 (as shown in fig. 3).

The positive electrode cake 30 of the button cell expands outward as lithium ions are intercalated during discharge of the cell.

When the positive electrode cakes 30 of the button cell positive electrode covers 10 in the embodiments 1 and 2 are expanded to overflow the positive electrode cover 10 axially upwards and then radially outwards, the upper surface of the annular boss 20 can support the overflowing positive electrode cake 30, the positive electrode cake 30 overflowing the positive electrode cover 10 can still have the current collecting effect, and the current collecting effect is better; moreover, the annular boss 20 is beneficial to positioning the positive electrode cover 10 when the positive electrode cover 10 is installed in the battery shell 40; in addition, since the annular boss 20 abuts against the inner peripheral wall of the battery can 40 when the positive electrode cake 30 expands radially outward, the effect of preventing the positive electrode cake 30 from expanding radially is better.

Preferably, as shown in fig. 1 to 3, a plurality of electrolyte through holes 21 are formed on the annular boss 20 located radially outside the positive electrode can 10. Further, as shown in fig. 3, all the electrolyte through holes 21 are uniformly spaced along the circumferential direction of the annular boss 20. Of course, the annular boss 20 may not be provided with the electrolyte through hole 21. Also, when the electrolyte via holes 21 are provided, the number of the electrolyte via holes 21 is not limited to 20 in the drawings, and the number thereof and the position of each electrolyte via hole 21 may be adjusted as needed.

Preferably, as shown in fig. 1 and 2, the annular boss 20 is integrally formed with the positive electrode can 10. Of course, the annular boss 20 may be formed separately from the positive electrode cover 10 and fixed together by welding or other fixing means.

The utility model discloses right the utility model discloses the ordinary skilled person in technical field does not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A positive electrode cover of button cell, which is a bottomed cylindrical structure, the top end of the positive electrode cover is arranged in an open manner, characterized in that: the upper edge of the peripheral wall of the anode cover is fixedly provided with an annular boss which protrudes outwards from the anode cover in the radial direction along the circumferential direction; when the battery is assembled, an anode cake is coaxially contained in the inner cavity of the anode cover, the bottom surface of the anode cake is attached to the inner surface of the bottom wall of the anode cover, the anode cake and the anode cover are coaxially placed in a cylindrical battery case formed by assembling an anode shell, a cathode shell and a sealing ring together, the outer bottom surface of the anode cover is attached to the inner bottom surface of the anode shell, an annular cavity is formed between the anode cover and the inner peripheral wall of the battery case, and the annular boss extends to the upper portion of the annular cavity radially outwards.

2. The button cell positive pole cover according to claim 1, characterized in that: and a plurality of electrolyte through holes are formed in the annular boss positioned on the radially outer side of the anode cover.

3. The button cell positive cover according to claim 2, characterized in that: all electrolyte via holes are uniformly arranged at intervals along the circumferential direction of the annular boss.

4. The button cell positive pole cover according to claim 1, characterized in that: the annular boss and the positive pole cover are integrally formed.

5. The button cell positive cover according to claim 1, characterized in that: the positive electrode shell and the negative electrode shell are both in a cylindrical shape with only one open end, the positive electrode shell and the negative electrode shell are arranged in a buckling manner, and the sealing ring is positioned between the positive electrode shell and the negative electrode shell and seals a gap between the positive electrode shell and the negative electrode shell; the inner bottom surface of the negative electrode shell is attached with a negative electrode plate, and a diaphragm is arranged between the positive electrode cake and the negative electrode plate and is separated from the positive electrode cake and the negative electrode plate through the diaphragm.

6. The button cell positive cover according to claim 5, characterized in that: when the outer periphery of the diaphragm is bent downwards at the inner peripheral wall of the battery shell, extends downwards along the inner peripheral wall of the battery shell and is inserted into the annular cavity, the annular boss extends outwards along the radial direction to the inner peripheral wall of the diaphragm.

7. The button cell positive cover according to claim 5, characterized in that: when the outer periphery of the diaphragm is positioned above the annular cavity and is not inserted into the annular cavity, the annular boss extends outwards along the radial direction to the inner peripheral wall of the battery shell.