CN214378760U

CN214378760U - Positive pole piece structure or negative pole piece structure and button cell

Info

Publication number: CN214378760U
Application number: CN202023089177.3U
Authority: CN
Inventors: 文志宇; 韩嘉琦; 刘金成; 刘建华
Original assignee: Huizhou Yiwei Energy Battery Co ltd; Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-10-08
Anticipated expiration: 2030-12-18

Abstract

The utility model discloses an anodal pole piece structure or negative pole piece structure and button cell, including the length direction who follows the pole piece be provided with the empty paper tinsel of head district, two-sided laminating district, single face laminating district and the empty paper tinsel of tip district, the empty paper tinsel of tip district after the inflection aligns with the single face laminating district, forms utmost point ear rubberizing recess to attach an utmost point ear in the empty paper tinsel of head district, another utmost point ear post attaches in utmost point ear rubberizing recess. The utility model discloses a with the empty paper tinsel of tip on the pole piece district inflection back, form utmost point ear rubberizing recess, thereby can fix a utmost point ear in this rubberizing recess, paste another utmost point ear in the empty paper tinsel of head district simultaneously, after coiling electric core coiling, can form two utmost point ears at pole piece head and the tail both ends, two pole pieces have just contained four utmost point ears, four utmost point ears are connected with outside casing respectively, thereby can make the electric current enter into the battery respectively through four utmost point ears inside, or export outward from the battery, and then strengthened the quick-charging performance of battery, promote the multiplying power performance of battery itself.

Description

Positive pole piece structure or negative pole piece structure and button cell

Technical Field

The utility model relates to a button cell field especially relates to a positive pole piece structure or negative pole piece structure and button cell.

Background

Currently, in the field of button cells, button cells have two pole piece structures, one being wound and one being laminated. Along with the development of the fast charging direction in the market, the requirements of 3C, 5C and even 10C are provided, in a winding type battery core, only one pair of lugs, namely only one positive lug and one negative lug, limit the direction of current, cause the input of only one end, and easily cause the problems that the edge position area of the lug is overcharged and the electric quantity in the middle area of the battery is small unevenly in the fast charging process.

For example, in the conventional winding battery, patent CN201520265181.0 discloses a cylindrical lithium-ion button battery winding structure, in which a middle positive electrode tab and an outer positive electrode tab are connected to a positive electrode sheet, a middle negative electrode tab and an outer negative electrode tab are connected to a negative electrode sheet, the middle positive electrode tab and the middle negative electrode tab are disposed on an inner ring of a cylindrical structure and are opposite to each other, and the outer positive electrode tab and the outer negative electrode tab are disposed on an outer ring of the cylindrical structure and are opposite to each other. After the lithium ion battery is wound, the middle anode tab and the middle cathode tab are oppositely arranged in the winding core inner ring, so that the situation that the middle cathode tab generates heat and is concentrated and difficult to dissipate heat during the work of the battery cell at the work especially with large multiplying power can be effectively avoided, and the safety performance of the battery cell is improved. However, in this patent, heat dissipation can be achieved when the battery cell works by arranging the positive and negative electrode tabs in the middle, and how to arrange the positive and negative electrode tabs in the middle at the end positions is not described, and how to achieve uniform and rapid charging is not disclosed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the weak point among the prior art, provide a reinforcing and fill the performance soon, improve the multiplying power performance of battery itself and improve cycle life's positive pole piece structure or negative pole piece structure and button cell.

The purpose of the utility model is realized through the following technical scheme:

a positive or negative pole piece structure comprising: be provided with the empty paper tinsel district of head, two-sided laminating district, single face laminating district and the empty paper tinsel district of tip along the length direction of pole piece, the empty paper tinsel of tip distinguish after the inflection with the single face laminating district aligns, forms utmost point ear rubberizing recess to with a utmost point ear attached in on the empty paper tinsel district of head, another utmost point ear post affixes in the utmost point ear rubberizing recess.

In one embodiment, the single-sided conformable region and the end foil void region are equal in area.

In one embodiment, the double-sided adhesive area comprises a first pole piece and a first diaphragm adhered to the upper side and the lower side of the first pole piece.

In one embodiment, the single-sided lamination area comprises a second pole piece and a second diaphragm laminated on the second pole piece.

In one embodiment, the first pole piece and the second pole piece are of an integrally molded structure.

In one embodiment, the end portion empty foil area is folded back in a direction away from the second diaphragm to form a tab gluing groove surrounded by the second pole piece, and the tab is attached in the tab gluing groove, so that two side surfaces of the tab are attached to the second pole piece.

In one embodiment, after the positive electrode sheet structure and the negative electrode sheet structure are jointly wound, a wound battery cell is formed, two positive electrode tabs corresponding to the positive electrode sheet structure are both located on one side of the wound battery cell, and two negative electrode tabs corresponding to the negative electrode sheet structure are both located on the other side opposite to the wound battery cell.

In one embodiment, one of the two positive electrode tabs is located at the center of the winding cell, and the other positive electrode tab is arranged at the outer edge of the winding cell.

In one embodiment, one of the two negative electrode tabs is located in the center of the winding cell, and the other negative electrode tab is arranged on the outer edge of the winding cell.

The utility model also provides a button cell, including above arbitrary positive pole piece structure or negative pole piece structure, still include positive casing and negative pole casing, positive pole piece structure is connected with positive casing, the negative pole casing with negative pole piece structural connection.

The utility model discloses compare in prior art's advantage and beneficial effect as follows:

the utility model relates to a positive pole piece structure or negative pole piece structure and button cell, through with the empty paper tinsel district inflection back of tip on the pole piece, form utmost point ear rubberizing recess, thereby can fix a utmost point ear in this utmost point ear rubberizing recess, paste another utmost point ear in the empty paper tinsel district of head simultaneously, after coiling electric core coiling, can form two utmost point ears at pole piece head and the tail both ends, two pole pieces just contain four utmost point ears, four utmost point ears are connected with the outside casing respectively, thereby can make the electric current enter into the battery respectively through four utmost point ears inside, or export outward from the battery, and then strengthened the quick charge performance of battery, promote the multiplying power performance of battery itself; meanwhile, the internal resistance of the battery can be reduced, the internal polarization of the battery is reduced, and the service life of the cycle use is prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a positive electrode plate structure or a negative electrode plate structure according to an embodiment of the present invention;

fig. 2 is a schematic structural view of the positive electrode sheet structure or the negative electrode sheet structure shown in fig. 1 after being folded back;

fig. 3 is a schematic structural view of a tab attached to a positive electrode plate structure or a negative electrode plate structure;

fig. 4 is a schematic structural diagram of a wound battery cell formed after winding the positive electrode sheet structure and the negative electrode sheet structure shown in fig. 1.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" 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. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

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.

Referring to fig. 1, fig. 2 and fig. 3, a positive electrode plate structure or a negative electrode plate structure includes: be provided with the empty foil district 100 of head, two-sided laminating district 200, single face laminating district 300 and the empty foil district 400 of tip along the length direction of pole piece, the empty foil district 400 of tip back-fold with single face laminating district 300 aligns, forms utmost point ear rubberizing recess 500 to with a utmost point ear 610 attached in on the empty foil district 100 of head, another utmost point ear 620 post affixes in the utmost point ear rubberizing recess 500. It should be noted that the head foil area 100 is used for attaching a first tab, and the double-sided attachment area 200 is used for achieving winding; the single-sided attaching area 300 is used for attaching a second tab together with the end part empty foil area 400 to fix the tab; the end void foil area 400 is used to secure a second tab. The double-sided adhesive region 200 is connected to the head blank region 100 and the single-sided adhesive region 300, respectively.

Thus, after the end empty foil area 400 on the pole piece is folded back, the pole tab rubberizing groove 500 is formed, so that one pole tab can be fixed in the pole tab rubberizing groove 500, the other pole tab is simultaneously pasted in the head empty foil area 100, after a winding electric core is wound, two pole tabs can be formed at the head end and the tail end of the pole piece, the two pole pieces comprise four pole tabs, and the four pole tabs are respectively connected with an external shell, so that current can respectively enter the battery through the four pole tabs or is output from the battery, the quick charging performance of the battery is enhanced, and the rate capability of the battery is improved; meanwhile, the internal resistance of the battery can be reduced, the internal polarization of the battery is reduced, and the service life of the cycle use is prolonged.

Note that the areas of the single-sided fit region 300 and the end portion empty foil region 400 are equal. So, through setting up the empty paper tinsel district 400 of single face laminating district 300 and tip that the area equals, can make the empty paper tinsel district 400 of tip attach on single face laminating district 300 completely to can have sufficient region to place utmost point ear, avoid the inner circle undersize and lead to utmost point ear can't place the problem, let utmost point ear can stretch out in the middle number of piles position of coiling electricity core, and owing to there are two pairs of pole pieces, then can reach the effect of two pairs of utmost point ears.

Referring to fig. 1 and 2, the double-sided adhesive region 200 includes a first pole piece 210 and a first diaphragm 220 attached to upper and lower sides of the first pole piece 210. Further, the single-sided lamination area 300 includes a second pole piece 310 and a second diaphragm 320 laminated on the second pole piece 310. It should be noted that the first pole piece 210 and the second pole piece 310 are an integral structure. Therefore, the stability of the pole pieces can be better, as can be seen from fig. 2, in one embodiment, one of the first diaphragms 220 on the first pole piece 210, which is also integrally formed with the second diaphragm 320, is a different position part of the same pole piece, and one of the functions of the first diaphragm and the second diaphragm is to effectively separate the two pole pieces when the winding core is wound, thereby ensuring the performance of the battery.

It should be noted that the end portion foil area 400 is folded back in a direction away from the second diaphragm to form a tab rubberizing groove 500 surrounded by the second pole piece, and the tab is attached in the tab rubberizing groove 500, so that two side surfaces of the tab are both attached to the second pole piece. So, bend the back through the setting and at laminating utmost point ear, can be so that utmost point ear can be connected with the pole piece steadily to through reserving the empty paper tinsel district of tip, can be so that utmost point ear has sufficient position to place, avoid the problem that utmost point ear can't be placed to the inner circle undersize.

Referring to fig. 4, after the positive electrode sheet structure 10 and the negative electrode sheet structure 20 are wound together, a wound battery cell 30 is formed, two positive electrode tabs (labeled with

numbers

11 and 12 in the drawing) corresponding to the positive electrode sheet structure 10 are located on one side of the wound battery cell, and two negative electrode tabs (labeled with

numbers

21 and 22 in the drawing) corresponding to the negative electrode sheet structure 20 are located on the other side of the wound battery cell 30. Therefore, the tabs are arranged in the end empty foil area and the head empty foil area, two pairs of tabs can be arranged on one winding battery core, namely two positive tabs and two negative tabs, and under the condition of the same surface density and compaction, compared with a battery with single tabs, the winding battery has higher multiplying power, lower internal resistance, better quick charging performance and cycle life, and the passing rate of a roller test is improved.

Furthermore, one of the two positive electrode tabs is located at the center of the winding battery cell, and the other positive electrode tab is arranged on the outer edge of the winding battery cell. One of the two negative pole lugs is positioned at the center of the winding battery cell, and the other negative pole lug is arranged on the outer side edge of the winding battery cell. So, can make the electric current enter into the battery respectively through four utmost point ears inside, perhaps export from the battery toward outside, and then strengthened the quick performance of filling of battery, promote the multiplying power performance of battery itself.

The utility model also provides a button cell, including above arbitrary positive pole piece structure or negative pole piece structure, still include positive casing and negative pole casing, positive pole piece structure is connected with positive casing, the negative pole casing with negative pole piece structural connection. Therefore, the button cell or button cell with the two pairs of tabs can enhance the quick charging performance, improve the multiplying power performance of the cell and prolong the cycle life.

the utility model relates to a positive pole piece structure or negative pole piece structure and button cell, through with the empty paper tinsel district inflection back of tip on the pole piece, form utmost point ear rubberizing recess, thereby can fix a utmost point ear in this rubberizing recess, paste another utmost point ear in the empty paper tinsel district of head simultaneously, after coiling electric core, can form two utmost point ears at pole piece head and the tail both ends, two pole pieces just have contained four utmost point ears, four utmost point ears are connected with outside casing respectively, thereby can make the electric current enter into the battery inside respectively through four utmost point ears, or export outward from the battery, and then strengthened the quick charge performance of battery, promote the multiplying power performance of battery itself; meanwhile, the internal resistance of the battery can be reduced, the internal polarization of the battery is reduced, and the service life of the cycle use is prolonged.

The above-mentioned embodiments 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

1. A positive pole piece structure or negative pole piece structure, comprising: be provided with the empty paper tinsel district of head, two-sided laminating district, single face laminating district and the empty paper tinsel district of tip along the length direction of pole piece, the empty paper tinsel of tip distinguish after the inflection with the single face laminating district aligns, forms utmost point ear rubberizing recess to with a utmost point ear attached in on the empty paper tinsel district of head, another utmost point ear post affixes in the utmost point ear rubberizing recess.

2. The positive or negative electrode sheet structure of claim 1, wherein the single-sided compliant region and the end void foil region are equal in area.

3. The positive or negative electrode sheet structure of claim 1, wherein the double-sided bonding region comprises a first sheet and a first separator bonded to upper and lower sides of the first sheet.

4. The positive or negative electrode sheet structure of claim 3, wherein the single-sided bonding region comprises a second electrode sheet and a second separator bonded to the second electrode sheet.

5. The positive or negative electrode sheet structure of claim 4, wherein the first and second electrode sheets are integrally formed.

6. The positive electrode plate structure or the negative electrode plate structure of claim 4, wherein the end portion foil-free area is folded back in a direction away from the second diaphragm to form a tab gluing groove surrounded by the second electrode plate, and the tab is attached in the tab gluing groove so that two side surfaces of the tab are both glued with the second electrode plate.

7. The positive electrode plate structure or the negative electrode plate structure of any one of claims 1 to 6, wherein the positive electrode plate structure and the negative electrode plate structure are wound together to form a wound battery cell, two positive electrode tabs corresponding to the positive electrode plate structure are both located on one side of the wound battery cell, and two negative electrode tabs corresponding to the negative electrode plate structure are both located on the other side of the wound battery cell.

8. The positive or negative pole piece structure of claim 7, wherein one of the two positive pole tabs is located at the center of the wound cell and the other positive pole tab is located at the outside edge of the wound cell.

9. The positive or negative pole piece structure of claim 8, wherein one of the two negative pole tabs is located at the center of the wound cell and the other negative pole tab is located at the outside edge of the wound cell.

10. A button cell, comprising the positive pole piece structure or the negative pole piece structure of any one of claims 1 to 9, and further comprising a positive shell and a negative shell, wherein the positive pole piece structure is connected with the positive shell, and the negative shell is connected with the negative pole piece structure.