CN214588966U

CN214588966U - Square winding button type lithium battery

Info

Publication number: CN214588966U
Application number: CN202120575889.1U
Authority: CN
Inventors: 段兴祎
Original assignee: Dongguan Huiyan Electronic Co ltd
Current assignee: Dongguan Huiyan Electronic Co ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-11-02
Anticipated expiration: 2031-03-22

Abstract

The utility model discloses a square coiling button type lithium battery, which comprises an anode upper cover, a cathode lower cover, a middle insulation spacer sleeve and an electric core, wherein the electric core comprises an anode plate, a cathode plate, a first diaphragm and a second diaphragm, after the anode plate and the cathode plate are coiled, the tail end positions are directly welded on the anode plate and the cathode plate through ultrasonic welding or laser welding to realize the connection purpose, a lug part is not needed, the process that the traditional pole pieces need to be overlapped and welded with lugs is omitted, the process flow is effectively simplified, and the production automation degree is favorably improved; meanwhile, the risk of short circuit fire caused by membrane puncture easily occurring in the wrapped pole ear is avoided, and the safety performance of the battery is effectively improved; in addition, the electrodeless lug occupies the inner space of the shell, so that the energy density of the battery in unit volume is greatly improved. To sum up, use the utility model discloses technical scheme can promote production efficiency, improves the product security, and the reinforcing product property can the performance for the cost is cheaper, and then promotes the product and synthesizes competitiveness.

Description

Square winding button type lithium battery

Technical Field

The utility model belongs to the technical field of the button cell, concretely relates to square coiling button lithium cell.

Background

The button cell is similar to a button in shape, appearance, size and dimension, is also called as a button cell, has the characteristics of larger diameter and thinner thickness, and is often used as a power source of various electronic products. The button cell battery has many kinds, and can be divided into a silver oxide battery, a lithium battery, an alkaline manganese battery and the like according to the used materials, wherein the button cell battery has the advantages of high capacity, long cycle life, low cost, environmental protection and the like and is widely applied.

The existing battery core assembly method of the button lithium battery comprises a lamination type battery core and a winding type battery core. However, the cell, whether a laminated or wound cell, generally needs to be welded to a casing by overlapping positive and negative electrode tabs on a pole piece or connected with the positive and negative electrodes by a soft package mode. The existing method wastes time on the manufacturing process and has low production efficiency; the pole lugs are made of metal materials, so that the pole lugs are wrapped in the pole pieces and are easy to pierce the diaphragm to cause short circuit and fire; in addition, the pole ear occupies a certain space in the shell with small volume, which causes energy density loss in unit volume.

SUMMERY OF THE UTILITY MODEL

To foretell not enough, the utility model aims to provide a structural design is ingenious, reasonable square coiling knot formula lithium cell.

In order to achieve the above purpose, the utility model provides a technical scheme is: the utility model provides a square knot of coiling formula lithium cell, its includes anodal upper cover, negative pole lower cover, middle insulating spacer and electric core, anodal upper cover and negative pole lower cover are buckled mutually and are constituted the casing that has inner space, middle insulating spacer is located between anodal upper cover and the negative pole lower cover, the electric core is located in the casing, electric core includes positive plate, negative pole piece, first diaphragm and second diaphragm, first diaphragm, positive plate, second diaphragm and negative pole piece superpose in proper order and convolute and form square body, wherein the end of positive plate is located the top surface position and the lug weld of square body are in on the inner wall of positive upper cover, the end of negative pole piece is located the bottom surface position and the lug weld of square body are in on the inner wall of negative pole lower cover.

As a preferred scheme of the utility model, positive plate includes that positive plate that positive pole material coating had all been coated on the positive side and be connected with this positive plate, and does not scribble the anodal connecting portion of positive pole material coating. The electrode foil is coated with a positive electrode material coating to form a positive electrode part, a section of blank is left at the end part of the electrode foil to form a positive electrode connecting part, and the positive electrode connecting part can be directly welded on the inner wall of the positive electrode upper cover by ultrasonic welding or laser welding from the outer surface of the positive electrode upper cover during welding to realize electric connection.

As a preferred aspect of the present invention, the length of the first separator is shorter than that of the positive plate, so that the positive electrode connecting portion of the positive plate is exposed to facilitate the welding process.

As a preferred scheme of the utility model, the negative pole piece includes that the positive and negative sides all coat the negative pole portion that has the negative pole material coating and be connected with this negative pole portion, and does not scribble the negative pole connecting portion of negative pole material coating. The negative electrode material coating is coated on the electrode foil to form a negative electrode part, a section of blank is left at the end part of the electrode foil to form a negative electrode connecting part, and the negative electrode connecting part can be welded on the inner wall of the negative electrode upper cover by directly adopting ultrasonic welding or laser welding from the outer surface of the negative electrode lower cover during welding to realize electric connection.

As a preferred embodiment of the present invention, the length of the second diaphragm is shorter than that of the negative electrode sheet, so that the negative electrode connecting portion of the negative electrode sheet is exposed to facilitate the welding process.

As an optimized scheme of the utility model, the length of anodal connecting portion is unanimous with the negative pole connecting portion, does benefit to production and welding process.

As an optimized scheme of the utility model, the opening of negative pole lower cover expands outward and forms conveniently anodal upper cover buckles into the portion that expands outward in it. Through the direction of expanding the portion outward, can conveniently assemble positive pole upper cover and negative pole lower cover mutually fast, improve production efficiency.

As a preferred scheme of the utility model, the lower edge enstrophe of middle insulating spacer forms bearing portion. The supporting part can be just coated at the lower end of the anode upper cover, so that the lower end of the anode upper cover is prevented from contacting the bottom surface of the inner cavity of the cathode lower cover, and the insulation effect is improved.

As a preferred scheme of the utility model, the anode upper cover is a square cover body. The negative electrode lower cover is a square cover body. The battery cell can be matched with the appearance profile of the battery cell, the whole structure is compact, and the occupied space is reduced.

The utility model has the advantages that: the utility model has the advantages of ingenious and reasonable structural design, directly connects the positive and negative pole pieces with the shell, does not need a pole ear part, saves the process of overlapping and welding pole ears in the traditional pole pieces, effectively simplifies the process flow, and is beneficial to improving the production automation degree; meanwhile, the risk of short circuit fire caused by membrane puncture easily occurring in the wrapped pole ear is avoided, and the safety performance of the battery is effectively improved; in addition, the electrodeless lug occupies the inner space of the shell, so that the energy density of the battery in unit volume is greatly improved. To sum up, use the utility model discloses technical scheme can promote production efficiency, improves the product security, and the reinforcing product property can the performance for the cost is cheaper, and then promotes the product and synthesizes competitiveness.

The present invention will be further explained with reference to the drawings and examples.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is an exploded schematic view of the present invention.

Fig. 3 is a schematic structural view of the middle insulating spacer of the present invention.

Fig. 4 is a schematic structural diagram of a middle cell of the present invention.

Detailed Description

Example (b): referring to fig. 1-4, the present embodiment provides a square winding button lithium battery, which includes an upper positive cover 1, a lower negative cover 2, an intermediate insulating spacer 3 and a battery cell 4.

Referring to fig. 2, the opening of the lower cover 2 of the negative electrode is flared to form a flared portion 21 for facilitating the buckling of the upper cover 1 of the positive electrode therein. Through the direction of expanding portion 21 outward, can conveniently assemble positive pole upper cover 1 and negative pole lower cover 2 mutually fast, improve production efficiency. The anode upper cover 1 and the cathode lower cover 2 are buckled to form a shell with an inner space, and the middle insulating spacer 3 is positioned between the anode upper cover 1 and the cathode lower cover 2. Namely, the inner wall of the middle insulating spacer 3 is coated on the outer side wall of the anode upper cover 1, and the outer wall of the middle insulating spacer 3 is tightly attached to the inner side wall of the cathode lower cover 2, so that the anode upper cover 1 and the cathode lower cover 2 are separated from each other to avoid contact. Preferably, referring to fig. 3, the lower edge of the intermediate insulating spacer 3 is turned inward to form a supporting portion 31. The supporting part 31 can just cover the lower end of the anode upper cover 1, so that the lower end of the anode upper cover 1 is prevented from contacting the bottom surface of the inner cavity of the cathode lower cover 2, and the separation effect is good.

The battery cell 4 is located in the casing, the battery cell 4 includes a positive plate 41, a negative plate 42, a first diaphragm 43 and a second diaphragm 44, the first diaphragm 43, the positive plate 41, the second diaphragm 44 and the negative plate 42 are sequentially stacked and wound to form a square body, in this embodiment, the positive upper cover 1 and the negative lower cover 2 are preferably square covers, and can be adapted to the shape profile of the battery cell 4, the overall structure is compact, and the occupied space is reduced.

Referring to fig. 4, the end of the positive plate 41 is located on the top surface of the square body and is directly welded to the inner wall of the positive electrode cap 1 by ultrasonic welding or laser welding, and specifically, the positive plate 41 includes a positive portion 411 whose front and back surfaces are coated with a positive material coating, and a positive connection portion 412 connected to the positive portion 411 and not coated with a positive material coating. That is, the positive electrode part 411 is formed by coating the positive electrode material on the electrode foil, and the positive electrode connection part 412 is formed by leaving a blank at the end of the electrode foil, so that the positive electrode connection part 412 can be welded on the inner wall of the positive electrode upper cover 1 by directly using ultrasonic welding or laser welding from the outer surface of the positive electrode upper cover 1 during welding, thereby realizing electrical connection.

The tail end of the negative plate 42 is positioned on the bottom surface of the square body and is directly welded on the inner wall of the negative lower cover 2 through ultrasonic welding or laser welding. Similarly, the negative electrode sheet 42 includes a negative electrode portion 421 having a positive surface and a negative surface both coated with a negative electrode material coating, and a negative electrode connecting portion 422 connected to the negative electrode portion 421 and not coated with a negative electrode material coating. That is, the negative electrode part 421 is formed by coating the negative electrode material on the electrode foil, and the negative electrode connection part 422 is formed by leaving a blank at the end of the electrode foil, so that the negative electrode connection part 422 can be welded on the inner wall of the negative electrode upper cover by directly adopting ultrasonic welding or laser welding from the outer surface of the negative electrode lower cover 2 during welding, thereby realizing electrical connection.

In the present embodiment, the first separator 43 is shorter than the positive electrode sheet 41 so that the positive electrode connection portion 412 of the positive electrode sheet 41 is exposed. The second separator 44 is preferably shorter in length than the negative electrode sheet 42 so that the negative electrode connection part 422 of the negative electrode sheet 42 is exposed. The lengths of the positive electrode connecting part 412 and the negative electrode connecting part 422 are preferably consistent, so that standardized production and welding procedures of products are facilitated. In other embodiments, the first separator 43 may be opened to expose a part or all of the positive electrode connecting portion 412, thereby achieving the purpose of facilitating welding.

In the production process, the positive plate 41 and the negative plate 42 can be welded with the positive upper cover 1 and the negative lower cover 2 correspondingly directly through ultrasonic welding or laser welding. The traditional pole lug part is omitted, and the process that the traditional pole piece needs to be overlaid and welded with the pole lug is correspondingly omitted, so that the process flow is simplified; meanwhile, the risk of short circuit fire caused by membrane puncture easily occurring in the wrapped pole ear is avoided, and the safety performance of the battery is effectively improved; in addition, the electrodeless lug occupies the inner space of the shell, so that the energy density of the battery in unit volume is effectively improved.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation. If the utility model discloses above-mentioned embodiment, adopt rather than the same or similar structure and the other batteries that obtain, all be in the utility model discloses protection scope.

Claims

1. The utility model provides a square knot of coiling formula lithium cell, its includes anodal upper cover, negative pole lower cover, middle insulating spacer and electric core, anodal upper cover and negative pole lower cover are buckled mutually and are constituted the casing that has inner space, middle insulating spacer is located between anodal upper cover and the negative pole lower cover, electric core is located in the casing, its characterized in that, electric core includes positive plate, negative pole piece, first diaphragm and second diaphragm, first diaphragm, positive plate, second diaphragm and negative pole piece superpose in proper order and convolute and form square body, wherein the end of positive plate is located the top surface position and the lug weld of square body are in on the inner wall of anodal upper cover, the end of negative pole piece is located the bottom surface position and the lug weld of square body are in on the inner wall of negative pole lower cover.

2. The square-wound lithium button cell according to claim 1, wherein the positive electrode sheet comprises a positive electrode part coated with a coating layer of a positive electrode material on both front and back sides and a positive electrode connecting part connected to the positive electrode part and not coated with a coating layer of a positive electrode material.

3. A square-wound lithium button cell according to claim 2, wherein the first separator has a length shorter than that of the positive electrode sheet so that the positive electrode connection part of the positive electrode sheet is exposed.

4. The square-wound lithium button cell of claim 2 wherein the negative electrode sheet comprises a negative electrode portion coated with a negative electrode material on both front and back sides and a negative electrode connecting portion connected to the negative electrode portion and not coated with a negative electrode material.

5. The square-wound lithium button cell of claim 4 wherein the second separator is shorter in length than the negative electrode sheet so that the negative electrode connection part of the negative electrode sheet is exposed.

6. A square wound lithium button cell battery as in claim 4, wherein the positive and negative electrode connections are of uniform length.

7. A square wound lithium button cell according to claim 1, wherein the opening of the lower negative cover is flared to form a flared portion for facilitating the snap-in of the upper positive cover.

8. A square wound lithium button cell according to claim 1, wherein the lower edge of the intermediate insulating spacer is turned inside out to form a support.

9. A square wound lithium button cell battery as in any of claims 1-8, wherein the positive top cover is a square lid.

10. The square wound lithium button cell of claim 9 wherein the negative bottom cover is a square lid.