CN216773361U

CN216773361U - Multi-tab winding type button cell capable of reducing polarization effect

Info

Publication number: CN216773361U
Application number: CN202122785426.0U
Authority: CN
Inventors: 赵裕锋
Original assignee: Guangdong Vdl New Energy Co ltd
Current assignee: Guangdong Vdl New Energy Co ltd
Priority date: 2021-11-13
Filing date: 2021-11-13
Publication date: 2022-06-17
Anticipated expiration: 2031-11-13

Abstract

The utility model discloses a multi-tab winding type button cell capable of reducing polarization effect, aiming at solving the technical problems that the battery in the prior art is in a single tab structure, and a plurality of tabs are not arranged according to actual needs, so that the battery has large polarization effect, and is not beneficial to large-rate discharge and quick charge. This button cell includes button cell body, installs upper cover module on the button cell body, connect in the button cell body is used for the lower part to connect the lower cover module of buckle closure, connect in the button cell body is used for carrying out anodal positive pole subassembly of connecting, connect in the button cell body is used for carrying out the negative pole subassembly that the negative pole is connected, set up in anodal subassembly and the inside engaging lug subassembly that is used for reducing button cell body charge-discharge polarization effect of negative pole subassembly. This engaging lug subassembly in button cell can with upper cover module and lower cover module between be connected, can reduce battery direct current impedance DCR, reduce battery alternating current impedance ACR.

Description

Multi-tab winding type button cell capable of reducing polarization effect

Technical Field

The utility model belongs to the field of button cell equipment, and particularly relates to a multi-tab winding type button cell capable of reducing polarization effect.

Background

At present, the head or tail of a positive pole piece and a negative pole piece of a winding type steel shell button cell is spot-welded with a single tab, and then the tab is wound and assembled into a shell. Because a single tab is welded at the head or the tail, and the battery has high reactivity near the tab region and low reactivity far from the tab region in the charging and discharging process, the battery has a large polarization effect and is not beneficial to high-rate discharging and quick charging.

At present, the utility model patent of patent number CN201420679969.1 discloses a many utmost point ear coiling formula high power battery, including the plastic-aluminum membrane and roll up the core, should roll up the core and include positive plate, negative pole piece and roll up the core, this positive plate and this negative pole piece set up respectively at the upper and lower both ends of this roll of core body, should roll up the core integument and wrap up in this plastic-aluminum membrane, and the filling has electrolyte in this plastic-aluminum membrane, and this positive plate and this negative pole piece stretch out from this plastic-aluminum membrane respectively and establish. Although it can promote production efficiency, reduce the production degree of difficulty, does not have die-cut hidden danger such as falling powder simultaneously, can promote battery comprehensive properties comprehensively, but this battery is the list utmost point ear structure, does not set up many utmost point ears according to actual need to it is big to lead to the battery polarization effect, is unfavorable for big multiplying power to discharge, quick charge.

Therefore, in order to solve the problem that the battery has a single tab structure and a plurality of tabs are not arranged according to actual needs, it is necessary to improve the use scenario of the button battery.

SUMMERY OF THE UTILITY MODEL

(1) Technical problem to be solved

Aiming at the defects of the prior art, the utility model aims to provide a multi-tab winding type button cell capable of reducing polarization effect, aiming at solving the technical problems that the battery in the prior art is in a single tab structure, and a plurality of tabs are not arranged according to actual needs, so that the battery polarization effect is large, and the battery is not beneficial to high-rate discharge and quick charge.

(2) Technical scheme

In order to solve the technical problems, the utility model provides a multi-tab winding type button cell capable of reducing polarization effect, which comprises a button cell body, an upper cover module arranged on the button cell body, a lower cover module connected to the button cell body and used for connecting a buckle cover at the lower part, a positive electrode assembly connected to the button cell body and used for performing positive electrode connection, a negative electrode assembly connected to the button cell body and used for performing negative electrode connection, and a connecting tab assembly arranged inside the positive electrode assembly and the negative electrode assembly and used for reducing charge-discharge polarization effect of the button cell body; and insulating glue connecting layers for isolating and sealing are arranged on the outer sides of the positive electrode assembly and the negative electrode assembly.

When the button cell adopting the technical scheme is used, the lug assembly used for reducing the charge-discharge polarization effect of the button cell body in the positive electrode assembly and the negative electrode assembly can be connected with the upper cover module and the lower cover module, so that the direct current impedance DCR of the cell can be reduced, the alternating current impedance ACR of the cell can be reduced, the film forming quality of a chemical electrolyte interphase (SEI) film can be improved, the quick charge performance of the cell can be improved, the rate discharge performance of the cell can be improved, the charge-discharge polarization effect of the cell can be reduced, the cycle electrical performance of the cell can be improved, and the like.

Preferably, a positive pole piece for connection is arranged in the positive pole assembly, and a negative pole piece for connection is arranged in the negative pole assembly. Through the arrangement of the positive pole piece and the negative pole piece, the positive and negative connection effect can be achieved, and the connection stability is ensured.

Furthermore, the outside of the positive pole piece is provided with a first positive pole lug for connecting the tail part, and the outside of the positive pole piece is provided with a second positive pole lug for connecting the middle part. Through the setting of the first positive tab, the tail of the positive electrode piece can be connected, and through the setting of the second positive tab, the middle of the positive electrode piece can be connected.

Still further, the negative pole piece outside is provided with the first negative pole ear that is used for the afterbody to carry out the connection, the negative pole piece outside is provided with the second negative pole ear that is used for the middle part to carry out the connection. The tail of the negative pole piece can be connected through the arrangement of the first negative pole lug, and the middle of the second negative pole lug can be connected through the arrangement of the second negative pole lug.

Preferably, a steel shell upper cover used for protection connection is arranged inside the upper cover module, and a steel shell lower cover used for protection connection is arranged inside the lower cover module. Through the setting of box hat upper cover, can be connected with positive pole piece, and through the setting of box hat lower cover, can be connected with negative pole piece.

Furthermore, the inside of the upper cover of the steel shell is provided with an external welding spot of a positive lug for connecting the top, and the lower cover of the steel shell is provided with an external welding spot of a negative lug for connecting the bottom. Through the setting of the outer welding spot of the positive lug, the steel shell upper cover can be welded with the first positive lug and the second positive lug, and through the setting of the outer welding spot of the negative lug, the steel shell lower cover can be welded with the first negative lug and the second negative lug.

Preferably, button cell body inside is provided with the electric core of coiling formula, the inside book core mesopore that is used for connecting the penetration of offering of electric core. Through the setting of electric core, can adopt the coiling formula mode, electric core utmost point ear is drawn forth respectively at electric core top, bottom, plays the effect of being convenient for connect.

(3) Advantageous effects

Compared with the prior art, the utility model has the beneficial effects that: the button cell can be connected with the upper cover module and the lower cover module by utilizing the connecting lug component, so that the direct current impedance DCR of the cell can be reduced, the alternating current impedance ACR of the cell can be reduced, the film forming quality of a formed SEI film can be improved, the quick charging performance of the cell can be improved, the multiplying power discharging performance of the cell can be improved, the charging and discharging polarization effects of the cell can be reduced, the cycle performance of the cell can be improved, and the like, and the service life of a button cell body can be prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, it is obvious that the drawings in the following description are only one embodiment of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a cell after spot welding of a lower cover in accordance with one embodiment of the button cell of the present invention;

fig. 2 is a schematic structural view of a rolled core after being rolled in accordance with one embodiment of the button cell;

fig. 3 is a schematic structural diagram of a cell after a cover is spot-welded according to a specific embodiment of the button cell of the present invention;

fig. 4 is a schematic structural diagram of a positive electrode tab in one embodiment of a button cell of the utility model.

The labels in the figures are: 1. a button cell body; 2. an upper cover module; 3. a lower cover module; 4. a positive electrode assembly; 5. a negative electrode assembly; 6. a connecting lug assembly; 7. an insulating glue connection layer; 8. a positive electrode plate; 9. a negative pole piece; 10. a first positive tab; 11. a second positive tab; 12. a first negative electrode tab; 13. a second negative tab; 14. a steel shell upper cover; 15. a steel shell lower cover; 16. welding points outside the positive lugs; 17. welding spots outside the negative electrode lugs; 18. an electric core; 19. and (4) a hole is formed in the winding core.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the utility model easily understood and obvious, the technical solutions in the embodiments of the present invention are clearly and completely described below to further illustrate the utility model, and obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments.

Example 1

Referring to fig. 1, the button cell includes a button cell body 1, an upper cover module 2 mounted on the button cell body 1, a lower cover module 3 connected to the button cell body 1 for connecting a cover, a positive electrode assembly 4 connected to the button cell body 1 for connecting a positive electrode, a negative electrode assembly 5 connected to the button cell body 1 for connecting a negative electrode, and a connecting lug assembly 6 disposed inside the positive electrode assembly 4 and the negative electrode assembly 5 for reducing a charging and discharging polarization effect of the button cell body 1; and insulating glue connecting layers 7 for isolating and sealing are arranged outside the positive electrode assembly 4 and the negative electrode assembly 5.

For the present embodiment, the position of the engaging lug assembly 6 can be adjusted according to actual needs.

Example 2

Referring to fig. 2-4, the button cell includes a button cell body 1, an upper cover module 2 installed on the button cell body 1, a lower cover module 3 connected to the button cell body 1 for connecting a cover at a lower portion thereof, a positive electrode assembly 4 connected to the button cell body 1 for positive electrode connection, a negative electrode assembly 5 connected to the button cell body 1 for negative electrode connection, and a connecting tab assembly 6 disposed inside the positive electrode assembly 4 and the negative electrode assembly 5 for reducing charge-discharge polarization effect of the button cell body 1; and insulating glue connecting layers 7 for isolating and sealing are arranged outside the positive electrode assembly 4 and the negative electrode assembly 5.

The positive pole piece 8 used for connection is arranged inside the positive pole component 4, the negative pole piece 9 used for connection is arranged inside the negative pole component 5, the first positive pole lug 10 used for tail connection is arranged on the outer side of the positive pole piece 8, and the second positive pole lug 11 used for middle connection is arranged on the outer side of the positive pole piece 8. The number of the first positive tab 10 and the second positive tab 11 can be increased or decreased according to the usage requirement.

Meanwhile, a first negative electrode lug 12 used for connecting the tail part is arranged on the outer side of the negative electrode pole piece 9, a second negative electrode lug 13 used for connecting the middle part is arranged on the outer side of the negative electrode pole piece 9, a steel shell upper cover 14 used for protection connection is arranged inside the upper cover module 2, and a steel shell lower cover 15 used for protection connection is arranged inside the lower cover module 3. Of course, the number of first negative electrode tab 12 and second negative electrode tab 13 may be increased or decreased according to the usage requirement.

In addition, the steel shell upper cover 14 is internally provided with a positive tab outer welding spot 16 for top connection, and the steel shell lower cover 15 is provided with a negative tab outer welding spot 17 for bottom connection.

In addition, a winding type battery cell 18 is arranged inside the button cell body 1, and a winding core hole 19 for connection and penetration is formed inside the battery cell 18.

It should be noted that the connection manner of the upper cover module 2 and the lower cover module 3 to the engaging lug assembly 6 is resistance spot-bottom welding, laser welding, top-bottom external welding or side wall external welding.

When the button cell of the technical scheme is used, firstly, the cell 18 is in a winding mode, the first positive tab 10 and the second positive tab 11 and the first negative tab 12 and the second negative tab 13 can be respectively led out from the top and the bottom of the cell 18 to play a role in convenient connection, then the cell is arranged in the steel shell lower cover 15, a welding needle with the diameter of 0.6-1.5mm penetrates into the winding core middle hole 19 to realize point-bottom welding in an electric resistance welding mode, the welding tabs can be the first positive tab 10 and the second positive tab 11 or the first negative tab 12 and the second negative tab 13, finally the semi-finished products of the welding shell and the tabs are welded with the other end of the tab and the steel shell upper cover 14 in a resistance type or laser welding mode and are realized in a top-bottom external welding or side wall welding mode, so that the direct current impedance DCR of the cell is reduced, the alternating current impedance ACR of the cell is reduced, and the film forming quality of a formed SEI film is improved, the quick charge performance of the battery is improved, the multiplying power discharge performance of the battery is improved, the charge-discharge polarization effect of the battery is reduced, the electric performance of the battery cycle is improved, and the service life of the button cell body 1 is further prolonged.

Having thus described the principal technical features and basic principles of the utility model, and the advantages associated therewith, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description is described in terms of various embodiments, not every embodiment includes only a single embodiment, and such descriptions are provided for clarity only, and those skilled in the art will recognize that the embodiments described herein can be combined as a whole to form other embodiments as would be understood by those skilled in the art.

Claims

1. A multi-tab winding type button cell capable of reducing polarization effect comprises a button cell body (1), an upper cover module (2) arranged on the button cell body (1), a lower cover module (3) connected to the lower part of the button cell body (1) and used for connecting a buckle cover, an anode assembly (4) connected to the button cell body (1) and used for carrying out anode connection, a cathode assembly (5) connected to the button cell body (1) and used for carrying out cathode connection, and a connecting tab assembly (6) arranged inside the anode assembly (4) and the cathode assembly (5) and used for reducing charge and discharge polarization effects of the button cell body (1); the insulating glue connecting layer (7) is arranged on the outer sides of the positive electrode assembly (4) and the negative electrode assembly (5) in an isolated and sealed mode.

2. The button cell with multiple tabs and winding for reducing polarization effect as claimed in claim 1 is characterized in that the positive electrode assembly (4) is internally provided with a positive electrode tab (8) for connection, and the negative electrode assembly (5) is internally provided with a negative electrode tab (9) for connection.

3. The button cell with multiple tabs and winding for reducing polarization effect as claimed in claim 2, wherein the positive electrode tab (8) is provided with a first positive tab (10) for tail connection and the positive electrode tab (8) is provided with a second positive tab (11) for middle connection.

4. The button cell of claim 2, characterized in that the outside of the negative pole piece (9) is provided with a first negative pole tab (12) for tail connection, and the outside of the negative pole piece (9) is provided with a second negative pole tab (13) for middle connection.

5. The button cell with multiple tabs and winding for reducing polarization effect as claimed in claim 1, wherein the top cover module (2) is internally provided with a top steel case cover (14) for protection connection, and the bottom cover module (3) is internally provided with a bottom steel case cover (15) for protection connection.

6. The button cell with multiple tabs and winding for reducing polarization effect as claimed in claim 5, wherein the top steel case cover (14) is provided with the external welding spot (16) of positive tab for top connection, and the bottom steel case cover (15) is provided with the external welding spot (17) of negative tab for bottom connection.

7. The multi-tab winding type button cell capable of reducing the polarization effect according to claim 1, wherein a winding type battery cell (18) is disposed inside the button cell body (1), and a winding core hole (19) for connection and penetration is formed inside the battery cell (18).