CN114628771B

CN114628771B - Winding type battery

Info

Publication number: CN114628771B
Application number: CN202011451666.0A
Authority: CN
Inventors: 陈永翀; 何颖源; 王玉伟; 张彬
Original assignee: Beijing Hawaga Power Storage Technology Co ltd
Current assignee: Haofengguang Energy Storage Chengdu Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2023-07-07
Anticipated expiration: 2040-12-10
Also published as: CN114628771A

Abstract

The invention provides a winding type battery, wherein a porous current collector is arranged in an electrode plate of the winding type battery, a region of the porous current collector formed by weaving warp yarns and weft yarns forms a current collecting region, and a weft yarn region at the edge of the porous current collector forms a tab region. Through the scattered bundling piece of the wire lugs, all the wire lugs can be scattered bundled, uniformly collected and positioned, so that the conductive connection between all the wire lugs and the electrode column is ensured, and the situations of wire missing connection, wire local connection and the like are avoided. By using the wire area of the porous current collector as the wire lug, the problems of difficult welding and easy desoldering between the lug and the current collector and between the lug and the pole can be avoided, the processing steps are reduced, and the current collecting effect is improved.

Description

Winding type battery

Technical Field

The invention relates to the field of batteries, in particular to a winding type battery.

Background

Lithium ion batteries have a series of advantages of high specific energy, high voltage, small self-discharge, good cycle performance, long service life and the like, and are receiving attention. The current collector is a support body of a battery electrode and is also a current converging and conducting carrier, and the battery current collector needs to have the characteristics of light weight, high strength, stable structure and performance in electrochemical reaction, good conductivity and the like. The porous conductive material is used as the current collector of the battery, so that the electrode material can be connected in an I shape through meshes, the contact area of the electrode material and the current collector is increased, and the electrode material is not easy to fall off even if the electrode material is thicker.

The woven metal mesh can be used as a porous current collector of a battery due to the characteristics of simple process, low cost and the like. However, when the woven meshes of the woven metal mesh are directly led out as the lugs and are welded with the pole or the lug connecting pieces, the weldability of the woven meshes of certain metal materials and the pole or the lug connecting pieces is very poor, so that the current is difficult to lead out, and the current can only be connected through the composite piece switching or the mechanical mode, so that the weight of the battery can be increased due to the increase of parts, the waste of the internal space of the battery core is caused, and the energy density of the battery is reduced. Particularly, when the non-full tab is led out, the warp and weft knitting characteristics of the knitted metal net lead to that only part of the knitted wires in the area are directly and electrically connected with the pole post or the tab connecting sheet, so that uneven current collection of the electrode sheet and even the whole battery core is caused, and the battery performance is seriously affected.

Disclosure of Invention

In view of the above problems, the present invention provides a wound battery in which a porous current collector is provided in an electrode sheet, a region of the porous current collector formed by weaving warp yarns and weft yarns forms a reaction current collecting region, and a weft yarn region of an edge of the porous current collector forms a tab extraction region. Through the scattered bundling piece of the wire lugs, all the wire lugs can be scattered bundled, uniformly collected and positioned, so that the conductive connection between all the wire lugs and the electrode column is ensured, and the situations of wire missing connection, wire local connection and the like are avoided. By using the wire area of the porous current collector as the wire lug, the problems of difficult welding and easy desoldering between the lug and the current collector and between the lug and the pole can be avoided, the processing steps are reduced, and the current collecting effect is improved.

The technical scheme provided by the invention is as follows:

according to the present invention, there is provided a wound battery including: the winding type battery cell is formed by laminating an electrode plate and an isolation layer and winding the electrode plate around a winding core, wherein a porous current collector is arranged in the electrode plate and comprises a braiding area formed by braiding warp yarns and weft yarns and a silk thread area formed by weft yarns, and the weft yarns of the silk thread area of the porous current collector extend out from the edge of the electrode plate to form a silk thread lug of the electrode plate; the shell comprises a shell body and an end cover, the winding type battery cell is accommodated in the shell body, and the end cover can be fixedly connected to the shell body; an electrode post disposed on the end cap; the wire lug dispersing and bundling piece is provided with a plurality of dispersing and bundling parts, all the wire lugs are divided into a plurality of groups of wire lugs corresponding to the dispersing and bundling parts, and each group of wire lugs is electrically connected to each dispersing and bundling part. Specifically, the winding type battery cell comprises an electrode sheet and an isolation layer, wherein the electrode sheet comprises a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet, the isolation layer and the negative electrode sheet are laminated and then wound to form the winding type battery cell. The positive plate is provided with a positive electrode active conductive material layer and a positive electrode current collector, and the negative plate is provided with a negative electrode active conductive material layer and a negative electrode current collector. In the invention, at least one of the positive current collector of the positive plate and the negative current collector of the negative plate is a porous current collector, and the porous current collector comprises a braiding area and a silk area by warp yarns and weft yarns. The area of the braiding area is approximately the same as the area of the electrode active conductive material layer, namely the braiding area is positioned in the electrochemical reaction area, and the current generated by the electrochemical reaction of the electrode can be led out through the conductive warp and weft bus of the braiding area. In the weaving area of the porous current collector, the warp yarns and the weft yarns are woven in a cross mode, preferably, the strength or density of the warp yarns is larger than that of the weft yarns, so that the trend of the warp yarns is consistent with the winding direction of the winding type battery cell, and the tensile strength of the winding type battery cell in the winding process is enhanced. At the edges of the woven area, thread areas are formed, which are mainly composed of weft threads, which are not located in the electrochemical reaction area but protrude from the edges of the electrode sheet. That is, the filament region is mainly composed of weft filaments, which function as tabs, but a small number of warp filaments may be provided in the filament region to maintain the shape of the weft filaments. The warp and weft filaments of the porous current collector may be the same electrically conductive material, e.g., stainless steel. Alternatively, the weft wires of the porous current collector are made of aluminum or copper with higher conductivity, and the warp wires are made of conductive materials or insulating materials with higher strength. The wire diameter of the weft yarn can be larger than that of the warp yarn, so that the contact area of the weft yarn and the electrode active material can be increased, and the conductive confluence effect of the weft yarn is enhanced. After the electrode plate provided with the porous current collector is wound, the wire lug of the electrode plate is formed by the wire area of the porous current collector in the electrode plate. The positive wire tab and the negative wire tab may protrude from one end of the cylindrical winding type cell or may protrude from both ends of the cylindrical winding type cell, respectively. For wound cells, particularly large wound cells, a large number of wire tabs extend. A large number of wire lugs are grouped into bundles through the wire lug dispersing and bundling pieces, so that the problems of missing connection or poor conductive connection of the wire lugs can be avoided even under the condition that the number of the wire lugs is large. The wire lug dispersing and bundling piece can be flexibly connected with the electrode column, the end cover and the shell in a conductive way or integrally formed with the electrode column, the end cover and the shell.

The wire lug dispersing and bundling piece can be disc-shaped, and the dispersing and bundling part can be through holes penetrating through the wire lug dispersing and bundling piece, and each group of wire lugs extends out of each through hole and is in conductive connection with the wire lug dispersing and bundling piece. That is, all the wire tabs may be divided into n groups, and n through holes are also provided on the wire tab dispersing and bundling member, and each group of wire tabs may pass through one through hole to perform, for example, welding, conductive bonding, mechanical crimping, or the like, thereby forming conductive connection between each group of wire tabs and the wire tab dispersing and bundling member. The wire tab dispersing and bundling piece can be in a circular, elliptic or polygonal disc shape, and is preferably in a circular shape. The through holes may be arranged in a circle around the periphery of the disk-shaped wire-tab dispersion bundle, or the through holes may be arranged in a plurality of circles around the center of the wire-tab dispersion bundle, or the through holes may be arranged radially from the center of the wire-tab dispersion bundle, or the like. Preferably, the wire electrode lugs extending from the through holes are bent in a mode that the wire electrode lugs are uniformly dispersed, and the bent wire electrode lugs can be uniformly dispersed in a round or fan shape, so that the wire electrode lugs, the wire electrode lug dispersing and bundling piece and the electrode column can be further ensured to be completely and conductively connected.

For better conductive contact with the wire tabs evenly dispersed on the wire tab dispersion cluster, the electrode post of the wound battery may include a cylindrical external portion and a disk-shaped internal portion, which may be in conductive abutment with the disk-shaped wire tab dispersion cluster. The columnar external connection part extends to the outside of the shell, the disk-shaped internal connection part is positioned in the shell, and the external connection part and the internal connection part can be integrally formed. The size of the inner joint may be substantially the same as the size of the wire tab dispersion bundle. The inner connecting part can be tightly attached to the wire lug dispersing and bundling piece, and the dispersed wire lugs are uniformly and flatly clamped between the inner connecting part and the wire lug dispersing and bundling piece, so that good conductive contact between all the wire lugs and the electrode column can be ensured.

The wire lug dispersing and bundling piece can be in a block shape, the dispersing and bundling part can be a groove formed on the side wall of the wire lug dispersing and bundling piece, and each group of wire lugs is in conductive connection with each groove. That is, all the wire tabs may be divided into n groups, n grooves are also provided on the wire tab dispersion cluster, and each group of wire tabs may be placed in one groove to perform, for example, welding, conductive bonding, mechanical crimping, or the like, thereby forming conductive connection between each group of wire tabs and the wire tab dispersion cluster. The wire lug dispersing and bundling piece can be in a round, oval or polygonal block shape. The block-shaped wire lug dispersing and bundling piece is thicker than the disc-shaped wire lug dispersing and bundling piece, so that the side wall of the block-shaped wire lug dispersing and bundling piece can be more favorably provided with longer grooves. The grooves may extend vertically, diagonally, or along a curve along the side walls of the wire lug dispersion cluster. In order to reduce the weight of the battery, the block-shaped wire-tab dispersing and bundling member may have a hollow box shape, and the groove may be formed on the side wall of the box-shaped wire-tab dispersing and bundling member in such a manner that the side wall is recessed inward.

The electrode column and the wire lug dispersing and bundling piece of the winding type battery can be integrally formed. For example, an end cover opening is formed in the end cover, the electrode column and the wire lug dispersing and bundling piece are integrally formed, the electrode column extends to the outside of the end cover from the end cover opening, and the wire lug dispersing and bundling piece is located in the shell. This reduces the number of parts and greatly simplifies the assembly process.

The wire lug dispersing and bundling piece can also be in a cylinder shape, and the dispersing and bundling part can be an opening penetrating through the cylinder wall of the wire lug dispersing and bundling piece, and each group of wire lugs extends out of each opening and is in conductive connection with the wire lug dispersing and bundling piece. That is, all the wire tabs may be divided into n groups, n openings are also provided on the wire tab dispersion cluster, and each group of wire tabs may be passed through one opening to perform, for example, welding, conductive bonding, mechanical crimping, or the like, thereby forming conductive connection of each group of wire tabs with the wire tab dispersion cluster. The openings may be disposed along one turn of the cartridge, or may be disposed along multiple turns of the cartridge, or may be disposed on the cartridge wall in a staggered fashion. The wire lug dispersing and bundling piece with the cylindrical structure is light in weight and is beneficial to the overall weight reduction of the battery. In order to facilitate the passage of a set of wire lugs through the opening, the opening may be sized larger, for example, larger than the cross-sectional dimension of a set of wire lugs. In order to be more favorable for fixing the wire lug bundles, a fixing groove can be arranged near the opening, and the wire lug bundles are fixedly connected after being placed in the fixing groove.

The wire lug dispersing and bundling piece can be further provided with a positioning part which is cylindrical and can be inserted into the winding core, so that the movement or rotation of the wire lug dispersing and bundling piece can be restrained. The positioning portion may be circular or polygonal cylindrical, and the maximum outer diameter of the positioning portion may be substantially equal to the inner diameter of the winding core, so as to ensure relative fixation of the positioning portion and the winding core. Or, through holes or threaded holes are formed in the positioning part and the winding core, and the positioning part and the winding core are fixed relatively through screws. The locating part is located at the bottom end of the wire lug dispersing and bundling piece, and after the locating part is fixed in the winding core, the wire lug dispersing and bundling piece is not easy to shift, so that stable connection of the wire lugs can be ensured.

The number of the wire-lug dispersing bundles may be plural, and the plural wire-lug dispersing bundles may be disposed in a manner spaced apart from each other, for example, circumferentially spaced apart or with inner and outer rings spaced apart, etc. The form of each wire tab dispersing and bundling piece can be different, for example, each wire tab dispersing and bundling piece can be respectively selected from one form of a disc, a block or a cylinder. According to an embodiment of the present invention, the wire tab dispersing and bundling piece may include a first wire tab dispersing and bundling piece and a second wire tab dispersing and bundling piece on one end of the electric core, where the first wire tab dispersing and bundling piece is located inside the second wire tab dispersing and bundling piece, the second wire tab dispersing and bundling piece is close to the housing, all wire tabs on the one end of the electric core are divided into a first part wire tab and a second part wire tab, the first part wire tab is electrically connected to the first wire tab dispersing and bundling piece, and the second part wire tab is electrically connected to the second wire tab dispersing and bundling piece. When the positive wire lug and the negative wire lug are respectively positioned at two ends of the electric core, the first part wire lug and the second part wire lug positioned at the same end of the electric core can be respectively a wire lug (positive wire lug or negative wire lug) positioned at the inner ring or the inner layer and a wire lug (positive wire lug or negative wire lug) positioned at the outer ring or the outer layer. When the positive wire lug and the negative wire lug are positioned at the same end of the battery cell, the first part wire lug and the second part wire lug can be the positive wire lug and the negative wire lug respectively. The first wire lug dispersing and bundling piece and the second wire lug dispersing and bundling piece can be connected with the electrode column in a conductive mode, and the first wire lug dispersing and bundling piece and the second wire lug dispersing and bundling piece can be connected with the end cover or the shell in a conductive mode. The wire tab bundles can be respectively and independently arranged. The plurality of wire tab bundles may be integrally formed or fixedly connected, and in addition, the plurality of wire tab bundles may be integrally formed or fixedly connected with, for example, an end cap.

It should be noted that the terms of up, down, left, right, etc. in the present invention are only for the purpose of making the description more clear, and do not serve as any limitation.

The invention has the advantages that:

1) Forming a reaction current collecting region in a warp-weft weaving region of the winding type battery porous current collector, forming a lug leading-out region in a weft-wise wire region at the edge of the end part, and carrying out dispersed bundling, uniform current collecting and positioning on all wire lugs of the whole reaction region of the electrode by using a wire lug dispersed bundling piece, so that the conductive connection of all wire lugs and electrode columns is ensured, and the situations of wire missing connection, wire local connection and the like are avoided;

2) The wire area of the porous current collector is used as the wire lug, so that the current collection and extraction are more convenient, the problems of difficult welding and easy desoldering between certain metals and the electrode column can be avoided, the use of current collection parts is reduced on the premise of ensuring the current collection effect, the current collection space is saved, and the energy density and the performance of the battery are improved.

Drawings

Fig. 1 (a) to 1 (c) are schematic views of a rolled battery according to a first embodiment of the present invention, wherein fig. 1 (a) is an exploded view, fig. 1 (b) is a sectional view, and fig. 1 (c) is a schematic view of a porous current collector;

fig. 2 (a) and 2 (b) are schematic views of a wound battery according to a second embodiment of the present invention, wherein fig. 2 (a) is an exploded view and fig. 2 (b) is a sectional view;

fig. 3 (a) and 3 (b) are schematic views of a rolled battery according to a third embodiment of the present invention, wherein fig. 3 (a) is an exploded view and fig. 3 (b) is a sectional view;

fig. 4 (a) and 4 (b) are schematic views of a rolled battery according to a fourth embodiment of the present invention, wherein fig. 4 (a) is an exploded view and fig. 4 (b) is a sectional view.

List of reference numerals

101-upper end cover

102-lower end cap

103-shell

104-end cap opening

2-electrode column

2 a-positive pole

2 b-negative pole column

201-filling and discharging through hole

202-external connection part

203-inner joint

204-plug

3-winding type cell

301-winding core

3 a-warp yarn

3 b-weft yarn

302-wire tab

4-wire tab dispersion bundling piece

4 a-first wire tab dispersion bundling piece

4 b-second wire tab dispersion bundling piece

401-through hole

402-groove

403-positioning part

404-flow-through hole

405-opening

Detailed Description

The invention will be further illustrated by way of example with reference to the accompanying drawings.

Fig. 1 (a) to 1 (c) are schematic views of a rolled battery according to a first embodiment of the present invention, wherein fig. 1 (a) is an exploded view, fig. 1 (b) is a sectional view, and fig. 1 (c) is a schematic view of a porous current collector. The winding type battery comprises a shell, an electrode column, a winding type battery core and a wire lug dispersing and bundling piece. In this embodiment, the housing includes an upper end cap 101, a lower end cap 102, and a middle case 103, and the upper end cap 101 and the case 103 are insulated from each other by an insulating ring. The winding type cell 3 is formed by laminating a positive electrode sheet, an insulating layer, and a negative electrode sheet and winding around a winding core 301. The winding core 301 is of a hollow structure, and a winding core through hole is arranged on the side wall of the winding core 301. The electrode column 2 is provided with a drain through hole 201, and the drain through hole 201 is in fluid communication with the hollow portion of the winding core 301. The electrode column 2 is provided with a columnar external connection part 202 extending out of the outer shell and a disk-shaped internal connection part 203 positioned in the outer shell, and the electrode column 2 and the end cover are integrally formed. A plurality of plugs 204 may also be provided on the surface of the inner joint 203 facing the wire lug dispersion bundle 4. The wire tab dispersing and bundling member 4 has a disc-shaped structure, and includes a plurality of through holes 401, a cylindrical positioning portion 403, and a fluid flow hole 404 for fluid flow, wherein the positioning portion 403 can be inserted into the hollow portion of the winding core 301 and the positioning portion 403 and the winding core 301 are fixed relatively by a screw. The through holes 401 are provided along the edge of the disk-shaped wire tab dispersing and bundling member 4, and the intervals between the through holes 401 are equal. The inner joint 203 of the electrode post 2 has a size substantially equal to that of the disk of the wire tab dispersion bundle 4, and a plurality of plugs 204 may be inserted into the through holes 401, respectively.

Porous current collectors are respectively arranged in the positive plate and the negative plate, and each porous current collector comprises a weaving area A formed by weaving warp yarns 3a and weft yarns 3B and a yarn area B formed by the weft yarns 3B. In the positive plate, the weft threads 3B of the thread region B of the porous current collector protrude from the edge of the positive plate to form the thread tab of the positive plate. In the negative electrode sheet, weft threads 3B of the thread region B of the porous current collector protrude from the edge of the negative electrode sheet to form a thread tab of the negative electrode sheet.

The wire lugs are divided into a plurality of groups along the circumference of the cell, and each group of wire lugs extends out of one through hole 401. When the end cover is pressed down, the plug 204 is inserted into the through hole 401 to fix the wire electrode lug in the through hole 401, meanwhile, the inner connecting part 203 of the electrode column presses and bends the wire electrode lug, and the wire electrode lug is pressed tightly through the wire electrode lug dispersing and bundling piece 4 and the inner connecting part 203 to realize conductive connection of the wire electrode lug and the electrode column 2. Fluid injected from the injection/discharge through-hole 201 enters the hollow portion of the jelly roll 301 through the through-hole 404, and then wets the entire cell through the jelly roll through-holes of the side wall of the jelly roll 301.

Fig. 2 (a) and 2 (b) are schematic views of a wound battery according to a second embodiment of the present invention, wherein fig. 2 (a) is an exploded view and fig. 2 (b) is a sectional view. In this embodiment, the main difference from the embodiment shown in fig. 1 is that the wire-tab dispersing and bundling member 4 has a cylindrical block-like structure, and a plurality of grooves 402 are provided in the side wall of the wire-tab dispersing and bundling member 4. The wire lug dispersing and bundling piece 4 and the electrode column 2 are integrally formed. The electrode column 2 protrudes from the end cap opening 104 on the end cap to the outside of the case, and the electrode column 2 is insulated and sealed from the end cap by an insulating member. The wire lug dispersing and bundling piece 4 is positioned in the shell. At one end of the battery cell, the positive wire lugs are divided into a plurality of groups along the circumferential direction of the battery cell, each group of wire lugs corresponds to one groove 402, each group of wire lugs is screwed and then plugged into the corresponding groove 402, and then the wire lugs are welded into the grooves 402 in a welding mode. At the other end of the battery cell, the negative electrode wire lugs are divided into a plurality of groups along the circumferential direction of the battery cell, each group of wire lugs corresponds to one groove 402, each group of wire lugs is screwed and then plugged into the corresponding groove 402, and then the wire lugs are welded into the grooves 402 in a welding mode. A large number of wire lugs can be dispersed into each groove for conducting connection, so that omission or poor connection caused by excessive wire lugs is avoided. The outer diameter of the positioning portion 403 of the wire-tab dispersing and bundling member 4 is approximately equal to the inner diameter of the winding core 301, and when the positioning portion 403 of the wire-tab dispersing and bundling member 4 is inserted into the hollow portion of the winding core 301, the movement or rotation of the wire-tab dispersing and bundling member 4 can be restricted, so that it is ensured that the wire tab welded to the wire-tab dispersing and bundling member 4 is not unwelded. The wire electrode lug and the electrode column can be conveniently connected in a conductive manner through the integrated electrode column and the wire electrode lug dispersing and bundling piece.

Fig. 3 (a) and 3 (b) are schematic views of a rolled battery according to a third embodiment of the present invention, wherein fig. 3 (a) is an exploded view and fig. 3 (b) is a sectional view. In this embodiment, the main difference from the embodiment shown in fig. 1 is that the wire-tab dispersing and bundling member 4 has a cylindrical structure, and a plurality of openings 405 are provided in the cylindrical wall of the wire-tab dispersing and bundling member 4. The wire lugs are divided into a plurality of groups along the circumference of the cell, and each group of wire lugs extends out of one opening 405 and is in conductive adhesion with the wire lug dispersing and bundling piece 4. An electrode column 2 is arranged on the end cover, and the end cover and the electrode column 2 are integrally formed by conductive materials. The wire lug dispersing and bundling piece 4 can be connected with the end cover in a conductive manner, and then is connected with the electrode column 2 in a conductive manner.

Fig. 4 (a) and 4 (b) are schematic views of a rolled battery according to a fourth embodiment of the present invention, wherein fig. 4 (a) is an exploded view and fig. 4 (b) is a sectional view. In this embodiment, the main difference from the embodiment shown in fig. 1 is that the wire tab dispersing and bundling member includes a disk-shaped first wire tab dispersing and bundling member 4a and a cylindrical second wire tab dispersing and bundling member 4b. The first wire tab dispersing and bundling member 4a includes a plurality of through holes 401, a cylindrical positioning portion 403, and a fluid flow hole 404 through which the fluid flows, and the positioning portion 403 is inserted into the hollow portion of the winding core 301. The through holes 401 are provided along the edge of the disk-shaped first wire tab dispersing and bundling member 4a, and the pitches between the through holes 401 are substantially equal. The second wire tab dispersion cluster 4b includes a plurality of openings 405. The openings 405 are provided along the wall of the cylindrical second wire tab dispersing and bundling member 4b, and the intervals between the openings 405 are substantially equal. The first wire-tab dispersing and bundling member 4a is disposed near the winding core, and the second wire-tab dispersing and bundling member 4b is disposed near the housing 103. All positive wire lugs of the battery cell are divided into a plurality of groups along the circumference of the battery cell, each group of positive wire lugs passes through one through hole 401 and is connected in a conductive manner, all negative wires of the battery cell are divided into a plurality of groups along the circumference of the battery cell, and each group of negative wire lugs passes through one opening 405 and is connected in a conductive manner. The positive electrode post 2a is provided with a columnar external portion 202 extending outside the case and a disk-shaped internal portion 203 located inside the case, and the internal portion 203 can be electrically connected to the first wire tab dispersion bundle 4 a. The cathode post 2b and the end cover are integrally formed, and the end cover can be electrically connected with the second wire lug dispersing and bundling piece 4b. The positive electrode post 2a is insulated and sealed with the end cap by an insulating seal.

The embodiments of the present invention are not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A wound battery, the wound battery comprising: the winding type battery cell is formed by laminating an electrode plate and an isolation layer and winding the electrode plate around a winding core, wherein a porous current collector is arranged in the electrode plate and comprises a braiding area formed by braiding warp yarns and weft yarns and a wire area formed by weft yarns, and the weft yarns of the wire area of the porous current collector extend out from the edge of the electrode plate to form a wire tab of the electrode plate; the shell comprises a shell body and an end cover, the coiled battery cell is accommodated in the shell body, and the end cover can be fixedly connected to the shell body; the electrode column is arranged on the end cover; the wire lug dispersing and bundling piece is provided with a plurality of dispersing and bundling parts, all the wire lugs are divided into a plurality of groups of wire lugs corresponding to the dispersing and bundling parts, and each group of wire lugs is electrically connected to each dispersing and bundling part.

2. The wound battery of claim 1, wherein the wire-tab dispersion bundling member is disc-shaped, the dispersion bundling portion is a through hole passing through the wire-tab dispersion bundling member, and each set of wire tabs extends from each through hole and is electrically connected with the wire-tab dispersion bundling member.

3. The wound battery of claim 2, wherein the electrode post of the wound battery comprises a cylindrical circumscribed portion and a disk-shaped inscribed portion in electrically conductive abutment with the disk-shaped wire-tab dispersion cluster.

4. The wound battery of claim 1, wherein the wire-tab dispersion bundling member is block-shaped, the dispersion bundling portion is a groove formed on a side wall of the wire-tab dispersion bundling member, and each group of wire tabs is electrically connected to each groove.

5. The wound battery of claim 4, wherein the electrode posts of the wound battery are integrally formed with the wire tab dispersion cluster.

6. The wound battery of claim 1, wherein the wire-tab dispersion cluster is cylindrical, the dispersion cluster is a through hole passing through a cylindrical wall of the wire-tab dispersion cluster, and each set of wire tabs extends from each through hole and is conductively connected with the wire-tab dispersion cluster.

7. The wound battery according to claim 1, wherein the wire-tab dispersion bundle is further provided with a positioning portion that is cylindrical and insertable into the inside of the winding core so as to be able to restrict movement or rotation of the wire-tab dispersion bundle.

8. The wound battery according to claim 1, wherein the number of the wire-tab dispersing bundles is plural, the plural wire-tab dispersing bundles being disposed in a spaced-apart manner from each other.

9. The wound battery of claim 8, wherein the wire tab dispersion bundling piece comprises a first wire tab dispersion bundling piece and a second wire tab dispersion bundling piece, the first wire tab dispersion bundling piece is located inside the second wire tab dispersion bundling piece, the second wire tab dispersion bundling piece is close to the housing, all the wire tabs are divided into a first part wire tab and a second part wire tab, the first part wire tab is electrically connected to the first wire tab dispersion bundling piece, and the second part wire tab is electrically connected to the second wire tab dispersion bundling piece.

10. The wound battery of claim 9, wherein the first wire-tab dispersion cluster is in conductive connection with the electrode column and the second wire-tab dispersion cluster is in conductive connection with the end cap or housing.