CN210897524U

CN210897524U - Multi-tab winding battery cell

Info

Publication number: CN210897524U
Application number: CN201922099243.6U
Authority: CN
Inventors: 陆郭庆; 王润发; 纪荣进; 郑明清; 陈杰; 杨山; 李载波
Original assignee: Huizhou Liwinon Energy Technology Co Ltd
Current assignee: Huizhou Liwinon Energy Technology Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-06-30
Anticipated expiration: 2029-11-29

Abstract

The utility model provides a multi-tab winding battery cell, which comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, wherein the positive plate is provided with a plurality of first lugs, the negative plate is provided with a plurality of second lugs, the first lugs and the second lugs are respectively arranged at two opposite sides of the battery cell, the positive tab is welded with the positive tab, and the second lugs are welded with the negative tabs in one-to-one correspondence with the positive tab; after winding, a plurality of positive lugs are overlapped with each other and the end parts of the exposed parts of the positive lugs are connected together, and after winding, a plurality of negative lugs are overlapped with each other and the end parts of the exposed parts of the negative lugs are connected together. Compared with the prior art, the utility model discloses setting up of welding utmost point ear on a plurality of lugs has realized that single coiling electricity core has parallelly connected effect promptly, has reached the effect that reduces the internal resistance, reduces the temperature that generates heat, has realized the quick charge and discharge of electric core simultaneously, has satisfied the technique of filling soon more than 5C.

Description

Multi-tab winding battery cell

Technical Field

The utility model relates to a lithium ion battery technical field, concretely relates to electricity core is convoluteed to many utmost points ear.

Background

The lithium battery comprises a positive electrode and a negative electrode, lithium ions are inserted between the two electrodes back and forth in the charging and discharging process, and electrons equal to the lithium ions also go back and forth between the two electrodes in an external circuit, so that a loop is formed. Conventionally, a positive tab and a negative tab are respectively welded on a positive electrode and a negative electrode of a single battery cell, and the whole battery is equivalent to a series structure by taking the positive tab and the negative tab as a loop (see fig. 1). However, it is known from ohm's law that the resistance of the series structure is large, and the increase of the resistance will reduce the charging speed of the battery and increase the energy loss, so that the requirements of the public cannot be met.

In view of the above, it is necessary to provide a technical solution to the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the utility model provides a multi-tab winding battery cell, solves the problem that present multi-tab battery cell's resistance is big, the charging speed is slow and energy loss is big, through the improvement to battery cell, has reduced the internal resistance of battery cell, has reduced the temperature of generating heat simultaneously and has improved the charging speed, satisfies masses' demand.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a multi-tab winding battery cell comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, wherein the positive plate is provided with a plurality of first lugs, the negative plate is provided with a plurality of second lugs, the first lugs and the second lugs are respectively arranged on two opposite sides of the battery cell, the positive tabs are welded on the first lugs, and the negative tabs which are in one-to-one correspondence with the positive tabs are welded on the second lugs; after winding, a plurality of positive lugs are overlapped with each other and the end parts of the exposed parts of the positive lugs are connected together, and after winding, a plurality of negative lugs are overlapped with each other and the end parts of the exposed parts of the negative lugs are connected together.

The utility model discloses a set up a plurality of lugs, again weld utmost point ear on the lug, be equivalent to divide into several little return circuits with whole electric core and parallelly connected together for the internal resistance of whole electric core is parallelly connected through many return circuits, and the positive negative pole ear of hypothesis setting is 3 respectively, has promptly divided into electric core the three-layer, and then resistance is R₁R₂R₃/(R₁R₂+R₂R₃+R₁R₃) R is less than R, so that the effect of reducing the internal resistance is achieved, the current is shunted, the effect of parallel connection can be achieved on a single electric core, and the quantity of the lugs is properly increased, so that the reduction of the internal resistance is facilitated. And due to the reduction of the internal resistance, the energy generated by the internal resistance is reduced, and the heating temperature of the battery cell is reduced. In addition, according to ohm's law, when the voltage is constant, the resistance becomes small, the current becomes large, and the charging speed of the battery is further improved. And the positive and negative electrode lugs are arranged at two ends, so that the distance is reduced, and the charging speed of the battery is further improved. The problems of large resistance, low charging speed and large energy loss of the conventional multi-tab battery cell are solved.

Preferably, the number of the first protruding pieces is 2-5, and the number of the second protruding pieces is 2-5. When the number of the tabs is too large, the integral thickness of the tabs is too thick, so that subsequent welding is influenced. Therefore, set up 2 to 5 can, when setting up to two, because the resistance of two reduces and is low excessively, can not be fine play the effect that reduces the internal resistance, consequently, more preferably, the quantity of first lug is 3 ~ 5, and the quantity of second lug is 3 ~ 5.

Preferably, the first protruding piece and the positive electrode piece are integrally formed. And after the coating and rolling of the positive plate are finished, cutting a first lug on the positive plate for welding the positive lug. Wherein, the edge area of one side of the positive plate can be selected not to be coated during coating, so that the redundant area can be directly removed during slitting.

Preferably, the second protruding piece is integrally formed with the negative electrode sheet. And after the negative electrode piece is coated and rolled, cutting a second lug on the negative electrode piece for welding the negative electrode lug.

Preferably, the first protruding piece and the current collector of the positive plate are made of the same material, and the second protruding piece and the current collector of the negative plate are made of the same material.

Preferably, the first protruding pieces are evenly distributed on the positive plate, and the second protruding pieces are evenly distributed on the negative plate. The evenly distributed lugs have the same interval, which is more beneficial to the subsequent welding.

Preferably, after winding, the ends of the exposed parts of the plurality of positive lugs are welded together. The outer end parts of the lugs are welded together, the middle sections of the lugs are not welded, namely the whole battery cell is layered into a plurality of layers, the adjacent positive lugs and the negative lugs form a small backflow, and finally the small backflow is collected at the outer end parts of the lugs, so that the effect of parallel connection on a single battery cell is realized, and the internal resistance is reduced.

Preferably, the ends of the exposed parts of the plurality of negative electrode tabs after winding are welded together.

Preferably, the first tab and the second tab are offset. In subsequent welding stage, the staggered arrangement can make the thickness distribution of the battery cell more uniform, and the influence on subsequent welding effect caused by the excessively thick thickness of the lug due to the excessively concentrated corresponding arrangement of the lug is reduced.

The beneficial effects of the utility model reside in that:

1) the utility model provides a multi-tab winding battery cell, which comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, wherein the positive plate is provided with a plurality of first lugs, the negative plate is provided with a plurality of second lugs, the first lugs and the second lugs are respectively arranged at two opposite sides of the battery cell, the positive tab is welded with the positive tab, and the second lugs are welded with the negative tabs in one-to-one correspondence with the positive tab; after winding, a plurality of positive lugs are overlapped with each other and the end parts of the exposed parts of the positive lugs are connected together, and after winding, a plurality of negative lugs are overlapped with each other and the end parts of the exposed parts of the negative lugs are connected together. Compared with the prior art, the utility model discloses a set up a plurality of lugs to welding utmost point ear on the lug, carrying out the layering with whole electric core in other words, reach the effect that reduces the internal resistance, shunt the electric current simultaneously, when voltage is certain, resistance diminishes, then the electric current grow, and then has improved the charge speed of battery. The utility model discloses a single coiling electricity core has parallelly connected effect promptly to reached the effect that reduces the internal resistance, reduces the temperature that generates heat, realized the quick charge-discharge of electricity core simultaneously, satisfied the technique of filling soon more than 5C. In addition, the anode and the cathode are arranged at two ends, so that the distance is reduced, and the charging speed of the battery is further improved.

2) The utility model discloses simple structure has realized that single coiling electricity core has parallelly connected effect promptly under the condition that does not increase traditional manufacturing process, is applicable to the mass production of industrialization.

Drawings

Fig. 1 is a schematic diagram of a conventional battery cell.

Fig. 2 is a schematic structural diagram of the present invention.

In the figure: 1-electric core; 11-positive tab; 12-negative tab; 13-a first tab; 14-second tab.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantageous effects will be described in further detail below with reference to the accompanying drawings of the detailed description and the specification, but the present invention is not limited thereto.

As shown in fig. 2, a multi-tab winding battery cell includes a positive plate, a negative plate, and a separator disposed between the positive plate and the negative plate, the positive plate is provided with a plurality of first tabs 13, the negative plate is provided with a plurality of second tabs 14, the first tabs 13 and the second tabs 14 are respectively disposed on two opposite sides of the battery cell 1, and the first tabs 13 and the second tabs 14 are disposed in a staggered manner; the first lug 13 is welded with the positive lug 11, and the second lug 14 is welded with the negative lugs 12 corresponding to the positive lugs 11 one by one; the wound positive electrode lugs are mutually overlapped, the wound negative electrode lugs are mutually overlapped, then the end parts of the exposed parts of the positive electrode lugs 11 are welded together, and the end parts of the exposed parts of the negative electrode lugs 12 are welded together; therefore, the inner end parts and the middle parts of the lugs are not welded, namely the whole battery core is layered into a plurality of layers, the adjacent positive lugs 11 and the adjacent negative lugs 12 form a small backflow, and the small backflow is finally collected at the outer end parts of the lugs, so that the effect of parallel connection on a single battery core is realized, and the internal resistance is reduced.

The first lug 13 and the positive plate 11 are integrally formed, the material of the current collector of the first lug 13 and the positive plate 11 is the same, the current collector can be aluminum foil, namely, when the positive plate 11 is coated, an area without coating on one side is reserved so as to facilitate subsequent slitting; similarly, the second protruding piece 14 is integrally formed with the negative electrode tab 12, the second protruding piece 14 and the current collector of the negative electrode tab 12 may be made of copper foil, and when the negative electrode tab 12 is coated, a coating region is reserved, and the coating region and the uncoated region of the positive electrode tab 11 are two ends of the wound battery core 1.

The first protruding pieces 13 are uniformly distributed on the positive electrode sheet 11, and similarly, the second protruding pieces 14 are uniformly distributed on the negative electrode sheet 12. The lugs with the same interval are arranged, so that the welding of the subsequent outer end part is facilitated. The number of the first protruding pieces 131 can be set to 2-5, and the number of the second protruding 4 pieces is also set to 2-5. When the number of the tabs is too large, the integral thickness of the tabs is too thick, so that subsequent welding is influenced. Therefore, it is sufficient to set 2 to 5, but when two are set, since the resistance reduction of two is too low, the effect of reducing the internal resistance cannot be well performed, and therefore, it is more preferable to set 3 to 5 respectively.

A preparation method of a multi-tab winding battery cell comprises the following steps:

s1, coating and rolling the positive and negative pole pieces respectively, and then slitting the pole pieces according to the set distance of the lugs, wherein the specific quantity of the lugs can be set according to the specific process production;

s2, winding the battery cell 1 according to the arrangement of the positive plate, the diaphragm and the negative plate;

s3, after the winding of the battery cell 1 is completed, the positive tab 111 and the negative tab 2 are respectively adjusted and aligned, and then the outer end portions of the positive tab 11 and the negative tab 12 are respectively welded;

and S4, finally, placing the battery in a battery shell to complete subsequent processes of packaging, formation and the like.

Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope 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.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Claims

1. A multi-tab winding battery cell is characterized by comprising a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate, wherein the positive plate is provided with a plurality of first lugs, the negative plate is provided with a plurality of second lugs, the first lugs and the second lugs are respectively arranged on two opposite sides of the battery cell, the positive tabs are welded on the first lugs, and the negative tabs which are in one-to-one correspondence with the positive tabs are welded on the second lugs; after winding, a plurality of positive lugs are overlapped with each other and the end parts of the exposed parts of the positive lugs are connected together, and after winding, a plurality of negative lugs are overlapped with each other and the end parts of the exposed parts of the negative lugs are connected together.

2. The multi-tab winding cell of claim 1, wherein the number of the first tabs is 2-5, and the number of the second tabs is 2-5.

3. The multi-tab wound cell of claim 1, wherein the first tab is integrally formed with the positive tab.

4. The multi-tab wound cell of claim 1, wherein the second tab is integrally formed with the negative plate.

5. The multi-tab winding cell of claim 1, wherein the first tab is made of the same material as the current collector of the positive tab, and the second tab is made of the same material as the current collector of the negative tab.

6. The multi-tab wound cell of claim 1, wherein the first tabs are evenly distributed on the positive pole piece and the second tabs are evenly distributed on the negative pole piece.

7. The multi-tab winding cell of claim 1, wherein the ends of the exposed portions of the plurality of positive tabs are welded together after winding.

8. The multi-tab wound cell of claim 1, wherein the ends of the exposed portions of the plurality of negative tabs are welded together after winding.

9. The multi-tab winding cell of claim 1, wherein the first tab and the second tab are staggered.