CN212783514U

CN212783514U - Current collecting cover for lithium manganese button cell

Info

Publication number: CN212783514U
Application number: CN202022068425.XU
Authority: CN
Inventors: 常海涛; 余佑锋
Original assignee: Shenzhen Jingfu Technology Co ltd
Current assignee: Shenzhen Jingfu Technology Co ltd
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2021-03-23
Anticipated expiration: 2030-09-21

Abstract

The utility model provides a lithium manganese is mass flow cover for button cell, the mass flow cover is whole to be the cylinder, and the open setting in mass flow cover upper end, the peripheral perpendicular to of the bobbin base of mass flow cover the bobbin base upwards extends and sets up four risers, and the even interval distribution of the circumference of all risers along the bobbin base forms the section of thick bamboo lateral wall of mass flow cover. The utility model discloses a can provide more electrolyte storage spaces during mass flow cover equipment battery, simultaneously, contact between its and the positive pole shell is also more inseparable.

Description

Current collecting cover for lithium manganese button cell

Technical Field

The utility model belongs to the technical field of the button cell and specifically relates to a mass flow cover for lithium manganese button cell.

Background

The button cell battery of lithium manganese has been widely used in various small electronic devices, such as power source for memory in computer and remote control of automobile, etc. through the development of 20 years recently, the button cell battery has required a shelf life of 5 years or more in many applications.

The existing lithium manganese button cell generally has the structure as follows: the button cell comprises a positive cover, a positive plate, a diaphragm, a negative plate and a negative cover which are sequentially stacked, wherein the upper opening and the lower opening of the positive cover and the negative cover are buckled with each other to form a cylindrical button cell shell, and an insulating sealing ring is clamped between the positive shell and the negative shell at the buckling position to electrically isolate the positive shell from the negative shell; the positive plate, the diaphragm and the negative plate are all packaged in a cylindrical button battery shell, and electrolyte is filled in the cylindrical button battery shell; and a current collecting net piece is arranged between the positive plate and the positive cover, the periphery of the current collecting net piece extends to be vertical to the current collecting net to form a lantern ring, and the lantern ring and the current collecting net piece are integrally formed to form a current collecting cover capable of accommodating the positive plate. Although the current collecting cover of the lithium manganese button cell can prevent the positive plate from expanding outwards, the current collecting cover also has the following defects: (1) the lantern ring used as the side wall of the current collecting cover is of a complete closed annular structure, the occupied volume is large, the space for storing electrolyte inside the battery is greatly compressed, and the reduction of the storage capacity of the electrolyte can cause the reduction of the discharge performance of the battery; (2) the deviation of the contact tightness between the collar and the positive electrode can lead to the increase of the contact resistance between the sleeve cup and the positive electrode can and the increase of the internal resistance of the battery.

Disclosure of Invention

An object of the utility model is to provide a lithium manganese is mass flow cover for button cell, this mass flow cover can provide more electrolyte storage space, and simultaneously, contact between its and the positive plate shell is also more inseparable.

The current collecting cover for the lithium-manganese button cell is integrally cylindrical, the upper end of the current collecting cover is arranged in an open mode, the periphery of the bottom of the current collecting cover is perpendicular to the bottom of the cell and extends upwards to form four vertical plates, and all the vertical plates are uniformly distributed at intervals along the circumference of the bottom of the cell to form the cell side wall of the current collecting cover.

The cylinder side wall of the collecting cover of the utility model is not in a closed circular ring shape, but is formed by a plurality of vertical plates which are distributed along the circumference of the cylinder bottom at even intervals, gaps exist between the adjacent vertical plates, and the gaps provide larger storage space for electrolyte, so that the positive plate accommodated in the collecting cover can absorb the electrolyte more fully in the later stage of discharging, and the discharging capacity of the battery in the later stage of discharging can be improved; meanwhile, the total area of the inner surface of the cylinder side wall of the current collecting cover is reduced, so that when the positive plate absorbs electrolyte and radially expands to extrude the cylinder side wall of the current collecting cover outwards, the pressure applied to the cylinder side wall of the current collecting cover is increased, the positive plate is in closer contact with the cylinder side wall of the current collecting cover, the contact impedance of the positive plate and the cylinder side wall of the current collecting cover is reduced, and the internal resistance of the battery is reduced.

Preferably, the quantity of riser is 3 ~ 6 pieces, both can avoid the quantity too much, increases the processing cost, simultaneously, also can avoid the quantity too little, influences limiting displacement.

Preferably, each vertical plate is an arc plate which can be matched with the outer side wall of the positive plate contained in the current collecting cover. By means of the structure, the stability of each vertical plate is better, the contact area between each vertical plate and the outer side wall of the positive plate is larger, and the positive plate plays a better limiting role when being radially expanded.

Preferably, the bottom plate of the cylinder bottom of the collecting cover bulges inwards, so that a plurality of bulges are formed on the inner bottom surface of the cylinder bottom, and the storage space of the electrolyte is further increased. In a specific implementation, all the protrusions are uniformly distributed. Furthermore, each bulge is in a pointed cone shape, and a through hole is vertically formed in the center of each bulge. The pointed conical bulge can be penetrated into the bottom surface of the positive plate and is tightly contacted with the positive plate, so that the contact impedance is reduced, and the internal resistance of the battery is reduced; meanwhile, the electrolyte stored in the gap between the adjacent vertical plates can flow into the bottom of the collecting cover, and then directly enters the inside of the positive plate through the through hole at the tip position of the pointed conical protrusion, so that the absorption of the positive plate on the electrolyte is accelerated.

Preferably, the positions of the cylinder bottom of the collecting cover, which are close to the vertical plates, are respectively sunken downwards to form convex strips on the outer bottom surface of the cylinder bottom, and the convex strips extend along the bending direction of the vertical plates to form arc-shaped arrangement. The current collecting cover can be in close contact with the positive electrode shell through the annular protrusion, contact internal resistance is reduced, and meanwhile, a gap is formed between the outer bottom surface of the cylinder bottom of the current collecting cover and the inner surface of the positive electrode shell, so that more electrolyte can be stored conveniently.

Drawings

Fig. 1 is a top view structural diagram of a current collecting cover for a lithium manganese button cell of the present invention;

fig. 2 is a sectional structural view of the current collecting cover for the li-mn button cell of the present invention along the line a-a in fig. 1.

Detailed Description

The embodiments of the present invention will now be described in detail with reference to the accompanying drawings:

with reference to fig. 1 and 2, the current collecting cover 1 for the lithium manganese button cell is cylindrical, the upper end of the current collecting cover 1 is open, four vertical plates 120 are arranged on the periphery of the barrel bottom 11 of the current collecting cover 1 and extend upwards perpendicular to the barrel bottom 11, and all the vertical plates 120 are uniformly distributed at intervals along the circumference of the barrel bottom 11 to form the barrel side wall 12 of the current collecting cover.

When in use, the current collecting cover 1 is arranged in the positive pole shell of the button cell, and the positive pole piece of the button cell is accommodated in the current collecting cover 1.

The cylinder side wall 12 of the collecting cover 1 of the utility model is not in a closed circular ring shape, but is formed by a plurality of vertical plates 120 which are evenly distributed at intervals along the circumference of the cylinder bottom 11, gaps exist between the adjacent vertical plates 120, and the gaps provide a larger storage space for the electrolyte, so that the positive plate accommodated in the collecting cover 1 can absorb the electrolyte more fully in the later stage of discharging, and the discharging capacity of the battery in the later stage of discharging can be improved; meanwhile, the total area of the inner surface of the cylinder side wall 12 of the collecting cover 1 is reduced, so that when the positive plate absorbs electrolyte and expands radially to press the cylinder side wall 12 of the collecting cover outwards, the pressure applied to the cylinder side wall 12 of the collecting cover is increased, the contact between the positive plate and the cylinder side wall 12 of the collecting cover is tighter, the contact impedance of the positive plate and the cylinder side wall of the collecting cover is reduced, and the internal resistance of the battery is reduced.

Preferably, as shown in fig. 1, each riser 120 is a circular arc plate that can be fitted to the outer sidewall of the positive plate housed in the collecting cover 1. By adopting the structure, the stability of each vertical plate 120 is better, the contact area between the vertical plate 120 and the outer side wall of the positive plate is larger, and the positive plate has a better limiting effect when expanding radially. Of course, the riser 120 of the present invention is not limited to the circular arc plate, but may be a straight plate structure.

Preferably, as shown in fig. 1 and 2, the bottom plate of the bottom 11 of the collecting cover 1 bulges inwards to form a plurality of protrusions 111 on the inner bottom surface of the bottom, thereby further increasing the storage space of the electrolyte. Of course, the bottom 11 of the collecting cover 1 of the present invention may also be a metal plate structure or a metal mesh structure. In a specific implementation, all of the protrusions 111 are evenly distributed, as shown in fig. 1. Further, as shown in fig. 2, each protrusion 111 is in a pointed cone shape, and a through hole 1111 is vertically formed in the center of each protrusion 111. The pointed conical protrusions 111 can penetrate into the bottom surface of the positive plate and are in close contact with the positive plate, so that contact resistance is reduced, and internal resistance of the battery is reduced; meanwhile, the electrolyte stored in the gap between the adjacent risers 120 can flow into the bottom 11 of the collecting cover 1, and then directly enters the inside of the positive plate through the through hole 1111 at the tip position of the pointed conical protrusion 111, so that the absorption of the positive plate on the electrolyte is accelerated. Of course, the protrusion 111 of the present invention may also be in the shape of a circular arc, a circular truncated cone, a square, or other common shapes.

Preferably, as shown in fig. 1 and 2, the collecting cover bottom 11 is recessed downward at a position close to each riser 120 to form a convex strip 112 on the outer bottom surface of the bottom, and the convex strip 112 extends in an arc shape along the bending direction of the riser 120. The collecting cover 1 can be in close contact with the positive electrode shell through the annular bulge 112, so that the contact internal resistance is reduced, and meanwhile, a gap is formed between the outer bottom surface of the collecting cover cylinder bottom 11 and the inner surface of the positive electrode shell, so that more electrolyte can be stored. Of course, the raised strips 112 may not be provided in the present invention.

Certainly, the number of the vertical plates 120 is not limited to 4 in the drawing, and the vertical plates can also be 3, 6 or more than 6, but the number of the vertical plates 120 is optimal when the vertical plates are 3 to 6, so that the excessive number can be avoided, the processing cost is increased, and meanwhile, the limit effect is also avoided because the number is too small.

Claims

1. The utility model provides a lithium manganese button cell is with mass flow cover, the whole cylinder that is of mass flow cover, and open the setting of mass flow cover upper end, its characterized in that: the periphery of the cylinder bottom of the flow collecting cover is vertical to the cylinder bottom and extends upwards to form four vertical plates, and all the vertical plates are uniformly distributed at intervals along the circumference of the cylinder bottom to form a cylinder side wall of the flow collecting cover.

2. The current collecting cover for lithium manganese button cell as claimed in claim 1, wherein: the number of the vertical plates is 3-6.

3. The current collecting cover for lithium manganese button cell as claimed in claim 1, wherein: each vertical plate is an arc plate which can be matched with the outer side wall of the positive plate contained in the current collecting cover.

4. The current collecting cover for lithium manganese button cell as claimed in claim 3, characterized in that: and the positions of the cylinder bottom of the collecting cover, which are close to each vertical plate, are respectively sunken downwards to form convex strips on the outer bottom surface of the cylinder bottom, and the convex strips extend along the bending direction of the vertical plates to form arc-shaped arrangement.

5. The current collecting cover for lithium manganese button cell as claimed in claim 1, wherein: the bottom plate of the cylinder bottom of the collecting cover is bulged inwards, so that a plurality of bulges are formed on the inner bottom surface of the cylinder bottom.

6. The current collecting cover for lithium manganese button cell as claimed in claim 5, characterized in that: each bulge is in a pointed cone shape, and a through hole is vertically formed in the center of each bulge.