CN112615089B - Lithium battery roll core, lithium battery and manufacturing method - Google Patents
Lithium battery roll core, lithium battery and manufacturing method Download PDFInfo
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- CN112615089B CN112615089B CN202011498496.1A CN202011498496A CN112615089B CN 112615089 B CN112615089 B CN 112615089B CN 202011498496 A CN202011498496 A CN 202011498496A CN 112615089 B CN112615089 B CN 112615089B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 77
- 229910052782 aluminium Inorganic materials 0.000 claims description 38
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 38
- 239000011888 foil Substances 0.000 claims description 37
- 238000000576 coating method Methods 0.000 claims description 15
- 238000003466 welding Methods 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 4
- 230000007704 transition Effects 0.000 abstract description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Manufacturing & Machinery (AREA)
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- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
本发明提供了一种锂电池卷芯，包括至少两个圆柱芯体和包绕至少两个圆柱芯体的长腰型围边；所述圆柱芯体包括一根正极片和分别贴附于正极片两侧的负极单元，两侧的负极单元一端部分重叠，负极单元将正极片包绕在重叠部分上；一端的圆柱芯体处于自由状态的负极单元包绕所有圆柱芯体形成围边。本发明的优点在于：通过两个负极单元相互缠绕形成圆柱芯体，制造效率高，卷芯一致性好，继承了圆柱卷芯界面反应稳定的优点，通过配置若干小直径的援助卷芯，增大了散热面积，规避了内部温度场不均匀的缺陷，通过对多个圆柱芯体进行统一的缠绕形成长腰型的方形卷芯，两端圆弧处的过渡更加均匀，卷芯结构更加紧凑，有效提升锂电池卷芯的能量密度。
The invention provides a lithium battery winding core, which includes at least two cylindrical cores and a long-waisted perimeter surrounding the at least two cylindrical cores; the cylindrical core includes a positive electrode sheet and is respectively attached to the positive electrode The negative electrode units on both sides of the sheet, the negative electrode units on both sides overlap at one end, and the negative electrode unit wraps the positive electrode sheet on the overlapping part; the negative electrode unit with the cylindrical core at one end in a free state surrounds all the cylindrical cores to form a surrounding edge. The advantages of the invention are: the cylindrical core is formed by intertwining two negative electrode units, the manufacturing efficiency is high, the core consistency is good, and the advantages of stable interface reaction of the cylindrical core are inherited. The heat dissipation area is enlarged, and the defect of uneven internal temperature field is avoided. By uniformly winding multiple cylindrical cores to form a long-waisted square core, the transition at the arcs at both ends is more uniform, and the core structure is more compact , effectively improve the energy density of the lithium battery core.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium battery roll core, a lithium battery and a manufacturing method.
Background
At present, the winding core of the power lithium battery mainly comprises a square core and a cylinder core. The cross section of the square winding core is oval, the variable tension movement of the pole piece and the diaphragm needs to be overcome in the manufacturing process, so that the movement deviation correction difficulty of the pole piece and the diaphragm is caused, the production efficiency is low, and the winding core is easily scrapped due to internal short circuit. The circular arcs on the two sides of the square roll core are easy to fall off, the chemical reaction interface is poor, and the energy exertion of the lithium battery can be seriously influenced. The production process of the cylindrical roll core is more mature, the production efficiency is high, and the consistency of the roll core is good. The motion of pole piece, diaphragm is rectified and is easily controlled, and inside chemical reaction is more stable. But the radial thermal conductivity of the cylindrical winding core is poor, and the temperature distribution in the battery is not uniform.
The utility model discloses a utility model with publication number CN210744083U discloses a cylinder lithium cell and parallelly connected book core thereof, through a plurality of positive pole utmost point ears and a plurality of negative pole utmost point ear parallel connection with adjacent cylinder book core as rolling up the core, the core structure that finally obtains is close to squarely, but what its main solution is parallelly connected to roll up the core uniformity poor and the great problem of performance difference, fails to solve the technological short slab that current square and circular book core exists respectively.
Disclosure of Invention
The invention aims to solve the technical problem of providing a square and round integrated winding core so as to solve the problems of difficult deviation correction and easy short circuit of the square winding core in movement, poor heat conduction of the round winding core diameter and uneven internal temperature distribution.
The invention solves the technical problems through the following technical scheme: a lithium battery roll core comprises at least two cylindrical cores and a long waist-shaped surrounding edge surrounding the at least two cylindrical cores; the cylindrical core body comprises a positive plate and negative units respectively attached to two sides of the positive plate, one end parts of the negative units on the two sides are overlapped, the other ends of the negative units are far away from each other, and the positive plate is wrapped on the overlapped parts by the negative units on the two sides; adjacent cylinder core has a common negative pole unit, and a negative pole unit and the positive plate winding of the cylinder core of rolling up core one end are attached on the cylinder core of locating, and a negative pole unit and the positive plate of the cylinder core of the other end wrap up all cylinder cores together and form the surrounding edge, a plurality of cylinder cores on the same book core are along linear arrangement, and a roll core only includes a positive plate.
According to the invention, the two negative electrode units are mutually wound to form the cylindrical core body, the manufacturing efficiency is high, the consistency of the winding core is good, the advantage of stable reaction of the interface of the cylindrical winding core is inherited, the heat dissipation area is increased by configuring a plurality of small-diameter assisting winding cores, the defect of non-uniform internal temperature field is avoided, the plurality of cylindrical core bodies are uniformly wound to form the long-waist-shaped square winding core, the transition at the circular arcs at two ends is more uniform, the structure of the winding core is more compact, and the energy density of the lithium battery winding core is effectively improved.
Preferably, the negative electrode unit comprises a negative electrode sheet and diaphragms respectively attached to two ends of the negative electrode sheet.
Preferably, the winding directions of the negative electrode units on the adjacent cylindrical cores are opposite, and the diameters of the plurality of cylindrical cores are approximately the same.
Preferably, a winding core comprises an odd number of cylindrical cores.
Preferably, the positive plate and the negative plate both comprise an aluminum foil and a coating coated on the aluminum foil, one end of the aluminum foil in the width direction is not provided with a pattern layer to form a blank foil area, and the width of the diaphragm is greater than that of the negative coating area and that of the positive coating area; in the winding core, the empty foil areas of the positive plate and the negative plate respectively face to two ends of the axial direction of the cylindrical core, and the aluminum foils of the empty foil areas of the positive plate and the negative plate corresponding to at least one circle of the outer side of the cylindrical core, the connecting part between the adjacent cylindrical cores and the surrounding edge are removed to form a non-foil area.
The invention also provides a lithium battery which comprises the roll core and an aluminum shell sleeved outside the roll core along the axial direction, wherein cover plates connected with the positive electrode and the negative electrode of the roll core are respectively arranged at two ends of the aluminum shell.
Preferably, the cover plate comprises a base plate, a connecting sheet connected with the end part of the cylindrical core body is arranged on one side of the base plate facing the roll core, a pole penetrating through the base plate and connected with the connecting sheet is arranged on the other side of the base plate, an insulating gasket is arranged between the pole and the base plate, and an insulating layer is arranged between the connecting sheet and the base plate.
Preferably, the base plate at one end is provided with an explosion-proof valve, and the base plate at the other end is provided with a liquid injection hole.
Preferably, the connecting piece includes a bus bar portion fixed to the base plate, a plurality of welding portions fixedly fitted to the end portions of the cylindrical core, and branch portions respectively connecting each of the welding portions and the bus bar portion, and the pole is connected to the bus bar portion.
The invention also provides a manufacturing method of the winding core, which comprises the following steps:
a: respectively manufacturing coatings on aluminum foils of the positive and negative pole pieces to obtain a coating area and a hollow foil area;
b: respectively laying negative electrode units on two sides of the positive electrode plate, wherein the length directions of the negative electrode units on the two sides are opposite, the negative electrode units are partially overlapped, and the directions of the empty foil areas of the positive electrode plate and the negative electrode units are opposite;
c: the anode plates are arranged on the inner sides of the cathode units on the two sides and wound on the overlapped parts to obtain a cylindrical core body;
d: if the cylindrical core body has an adjacent cylindrical core body which is not manufactured, the end part of the negative pole unit in the free state is used as the next winding center, and the step B is returned until the wound cylindrical core body meets the requirement of the number of the winding cores;
e: a free end negative electrode unit of the cylindrical core body at one end of the winding core and the positive plate are synchronously attached to the cylindrical core body; the negative electrode unit and the positive electrode plate at the free end of the cylindrical core body at the other end commonly bypass all the cylindrical core bodies to form the surrounding edge of the winding core;
f: and removing aluminum foils of at least one circle of the periphery of the cylindrical core body, the cylindrical core body connecting area and the hollow foil area of the surrounding edge to obtain an electrodeless ear area, and forming a positive electrode ear and a negative electrode ear at two ends of the winding core.
The invention also provides a method for manufacturing the lithium battery, which comprises the following steps
Step 1: the winding core axially penetrates through the aluminum shell to enable the positive electrode lug and the negative electrode lug at the two ends to be leaked at the two ends of the aluminum shell;
step 2: kneading the positive electrode lug and the negative electrode lug at the two ends of the flat winding core;
and step 3: respectively attaching the welding parts of the cover plate to the positive electrode lug and the negative electrode lug of the cylindrical core body, and welding and fixing;
and 4, step 4: bending the branch part to make the substrate cover the end of the aluminum shell;
and 5: and clamping the substrate with the aluminum shell, and welding and fixing to obtain the lithium battery.
The lithium battery roll core, the lithium battery and the manufacturing method provided by the invention have the advantages that: through two negative pole unit intertwine formation cylinder cores, it is efficient to make, it is good to roll up the core uniformity, inherited the stable advantage of cylinder core interface reaction, roll up the core through the assistance of configuring a plurality of minor diameters, increased heat radiating area, avoided the inhomogeneous defect in inside temperature field, through carrying out the square book core that the winding formation waist type was unified to a plurality of cylinder cores, the transition of both ends circular arc department is more even, roll up the core structure compacter, effectively promote the energy density that the lithium cell rolled up the core.
Drawings
Fig. 1 is a schematic view of a lithium battery winding core provided in an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a positive plate and a negative plate before being wound by a lithium battery winding core according to an embodiment of the present invention;
fig. 3 is a schematic view of a method for winding a cylindrical core of a lithium battery winding core according to an embodiment of the present invention;
fig. 4 is a schematic view of a circumferential core of a lithium battery jelly roll provided by an embodiment of the invention;
fig. 5 is a schematic diagram of a cylindrical core of a lithium battery roll core according to an embodiment of the present invention, and a next cylindrical core is manufactured;
fig. 6 is a schematic diagram of a lithium battery roll core with two cylindrical cores according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a manufacturing method of a lithium battery roll core with three cylindrical cores according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a positive plate and a negative plate of a lithium battery winding core provided by an embodiment of the invention;
fig. 9 is a schematic view of a lithium battery provided in an embodiment of the present invention;
fig. 10 is a schematic view of a lithium battery cover plate according to an embodiment of the present invention;
fig. 11 is a schematic inner side view of a lithium battery cover plate according to an embodiment of the present invention;
fig. 12 is a schematic view illustrating a welding portion and a winding core of a lithium battery according to an embodiment of the present invention;
fig. 13 is a schematic view illustrating the installation of a cover plate of a lithium battery according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below in detail and completely with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides a lithium battery roll core, which includes at least two cylindrical cores 1 and a long waist-shaped surrounding edge 2 surrounding the at least two cylindrical cores 1; with reference to fig. 2, the cylindrical core 1 includes a positive plate 3 and negative units 4 respectively attached to two sides of the positive plate, one end of each of the negative units 4 is overlapped, and the other end is away from each other, with reference to fig. 3 and 4, the positive plate 3 is wrapped by the negative units 4 on two sides; adjacent cylinder core 1 has a common negative pole unit 4, and a negative pole unit 4 and the positive plate 3 winding of the cylinder core 1 of rolling up core one end are attached on the cylinder core 1 of locating, and a negative pole unit 4 and the positive plate 3 of other end cylinder core 1 wrap up all cylinder cores 1 together and form surrounding edge 2, a plurality of cylinder cores 1 on the same roll core are along linear arrangement, and a roll core only includes a positive plate 3.
This embodiment forms cylinder core 1 through two negative pole unit 4 intertwines, and it is efficient to make, and it is good to roll up the core uniformity, has inherited the stable advantage of cylinder core interface reaction, rolls up the core through the assistance of configuring a plurality of minor diameters, has increased heat radiating area, has avoidd the inhomogeneous defect in inside temperature field, through carrying out the square book core that the unified winding formed the long waist type to a plurality of cylinder cores 1, the transition of both ends circular arc department is more even, it is compacter to roll up the core structure, effectively promote the energy density that the lithium cell rolled up the core.
Referring to fig. 2, the negative electrode unit 4 includes a negative electrode sheet 41 and separators 42 respectively attached to two ends of the negative electrode sheet 41, and since the negative electrode sheet 41 is rich in graphite and is easily broken off and scratched during the winding and transportation process, the separators 42 are attached to two sides of the negative electrode sheet for protection.
It should be noted that, for the battery, under the condition that the mechanism of storing the electric energy is determined, the positive and negative electrodes thereof generally have no influence on the battery performance, so the positive electrode tab 3 and the negative electrode tab 41 can be exchanged for use in the embodiment, and under the condition that the overall structure of the winding core is not substantially improved, exchanging the positive and negative electrode tabs still falls within the inventive concept of the embodiment.
Referring to fig. 5, after a cylindrical core is wound, if a cylindrical core needs to be manufactured at the left end, the negative electrode unit 4 is arranged on the positive electrode plate 3, the overlapping portion of the negative electrode unit 4 is wrapped by the same method to obtain a new cylindrical core 1, the two cylindrical cores 1 are closely arranged, the right end of the two cylindrical cores 1 naturally bypasses the two cylindrical cores 1 to obtain the winding core with the two cylindrical cores shown in fig. 6, and the positive electrode plate 3 and the negative electrode unit 4 at the end portion are cut off and fixed together.
Referring to fig. 7, if another cylindrical core 1 is arranged on the right side of the first cylindrical core 1, the negative electrode unit 4 on the right side is correspondingly provided with a partially overlapped negative electrode unit 4 attached to the positive electrode plate 3, the third cylindrical core 1 is wound by the same method, and finally more cylindrical cores 1 can be manufactured by extending outwards again on the basis of the cylindrical cores 1 on both sides, if only three cylindrical cores 1 are needed, the free end of the right or left cylindrical core 1 can be directly used to bypass all the cylindrical cores 1 to obtain the winding core shown in fig. 1.
With reference to fig. 1 and 6, after winding, the winding directions of the negative electrode units 4 on the adjacent cylindrical cores 1 are opposite, the diameters of the cylindrical cores 1 on the same winding core are basically the same, and the winding turns are the same due to the consistent materials, and the diameters have certain deviation due to the incomplete consistency of the winding tightness.
Referring to fig. 6, in the case of an even number of cylindrical cores 1, the winding direction of the skirt 2 is opposite to the winding direction of the free end of another cylindrical core 1, which is inconvenient for tensioning, whereas in fig. 1, in the case of an odd number of cylindrical cores 1, the free ends of the cylindrical cores 1 at both ends are wound the same, which facilitates tensioning of the skirt 2, and thus an odd number of cylindrical cores 1 are preferably provided on one winding core.
The positive plate 3 and the negative plate 41 have the same structure, and referring to fig. 8, the positive plate 3 and the negative plate 41 both include an aluminum foil (not shown) and a coating 5 coated on the aluminum foil, the coating 5 is coated on both sides of the aluminum foil, and a blank foil area 51 is formed at one end of the aluminum foil in the width direction without the coating 5; the width of the separator 42 is greater than the width of the negative electrode coating region than the width of the positive electrode coating region 31; when winding the winding core, the empty foil areas 51 of the positive plate 3 and the negative plate 41 respectively face to two axial ends of the cylindrical core 1, so as to form the positive and negative poles of the cylindrical core 1, the positive and negative poles of all the cylindrical cores 1 on the same winding core have the same direction, the non-foil area 52 corresponds to the non-polar lug area of the winding core, and the non-foil area 52 can be processed before or after winding.
Referring to fig. 9, on the basis of the lithium battery roll core, the embodiment further provides a lithium battery, which includes a roll core and an aluminum shell 6 wrapping the roll core, and two ends of the aluminum shell 6 are respectively provided with a cover plate 7 connected with the positive electrode and the negative electrode of the roll core. The cover plate 7 is respectively a positive pole piece and a negative pole piece of the lithium battery, and the square-round integrated lithium battery is obtained by packaging a roll core.
Referring to fig. 10 and 11, the cover plate 7 includes a base plate 71, a connecting sheet 72 connected with the end of the cylindrical core 1 is provided on one side of the base plate 71 facing the winding core, a pole 73 passing through the base plate 71 and connected with the connecting sheet 72 is provided on the other side of the base plate 71, an insulating gasket 74 is provided between the pole 73 and the base plate 71, an insulating layer 75 is provided between the connecting sheet 72 and the base plate 71, the connecting sheet 72 and the pole 73 are both made of metal materials, and are preferably made of materials with excellent conductivity, an explosion-proof valve 76 is provided on one of the cover plates 7 at both ends, and a liquid injection hole 77 is provided on the other one of the cover plates, and no limitation is imposed on which end the explosion-proof valve 76 and the liquid injection hole 77 are specifically provided at. The base plate 71 is fixedly connected with two ends of the aluminum shell 6 to encapsulate the winding core, in this embodiment, the base plate 71 and the aluminum shell 6 are fixed by welding, so the base plate 71 is also made of a metal material, and the pole 73 is insulated and separated from the base plate 71 by the insulating gasket 74.
Referring to fig. 11 and 12, the connection piece 72 includes a bus-bar portion 723 fixed on the base plate 71, a plurality of welding portions 721 fixedly fitted to the end portion of the cylindrical core 1, and branch portions 722 respectively connecting each welding portion 721 and the bus-bar portion 723, and the pole 73 is connected to the bus-bar portion 723.
The embodiment also provides a method for manufacturing the winding core, which comprises the following steps:
a: referring to fig. 8, coatings are respectively made on the aluminum foils of the positive and negative electrode sheets to obtain a coated area 5 and an empty foil area 51;
b: referring to fig. 2, the negative electrode units 4 are respectively laid on two sides of the positive electrode sheet 3, the negative electrode units 4 may be integrally fixed and then attached to the positive electrode sheet 3, or may be attached to the positive electrode sheet 3 layer by layer, the directions of the negative electrode units 4 on two sides are opposite, and there is a partial overlap, and the directions of the positive electrode sheet 3 and the empty foil areas 51 of the negative electrode units 4 are opposite;
c: referring to fig. 3, the negative electrode units 4 on both sides place the positive electrode sheet on the inside and wind it on the overlapped portion, resulting in the cylindrical core 1 shown in fig. 4;
d: referring to fig. 5, if the cylindrical core 1 has an adjacent cylindrical core 1 which is not manufactured, the end of the negative electrode unit 4 in the free state is taken as the next winding center, and the step B is returned until the wound cylindrical core 1 meets the requirement of the number of winding cores;
e: referring to fig. 6, the free end negative electrode unit 4 of the cylindrical core 1 at one end of the winding core and the positive electrode sheet 3 are synchronously attached to the cylindrical core 1, such as the cylindrical core 1 at the left side of fig. 6; the negative electrode unit 4 and the positive electrode plate at the free end of the cylindrical core body 1 at the other end together bypass all the cylindrical core bodies to form the surrounding edge of the winding core;
f: and removing aluminum foils of at least one circle of the periphery of the cylindrical core body 1, the connection area of the cylindrical core body 1 and the hollow foil area 51 of the periphery to obtain an electrodeless ear area, and forming a positive electrode ear and a negative electrode ear at two ends of the winding core.
Further, based on the above manufacturing method of the winding core, the embodiment further provides a manufacturing method of a lithium battery, including
Step 1: the winding core axially penetrates through the aluminum shell 6, so that the anode lug and the cathode lug at the two ends are exposed at the two ends of the aluminum shell 6;
step 2: kneading the positive electrode lug and the negative electrode lug at the two ends of the flat winding core, namely folding the positive electrode lug and the negative electrode lug by using ultrasonic waves and flattening;
and step 3: the welding parts 721 of the cover plate 7 are respectively attached to the positive electrode tab and the negative electrode tab and are welded and fixed by laser;
and 4, step 4: referring to fig. 13, the branch portion 722 is bent so that the substrate 71 covers the end of the aluminum case 6;
and 5: the lithium battery shown in fig. 9 was obtained by engaging the substrate 71 with the aluminum case 6 and fixing them by laser welding.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
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