CN114597473A - Lithium battery manufacturing method and lithium battery - Google Patents
Lithium battery manufacturing method and lithium battery Download PDFInfo
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- CN114597473A CN114597473A CN202210264353.7A CN202210264353A CN114597473A CN 114597473 A CN114597473 A CN 114597473A CN 202210264353 A CN202210264353 A CN 202210264353A CN 114597473 A CN114597473 A CN 114597473A
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- lithium battery
- winding core
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 238000004804 winding Methods 0.000 claims abstract description 95
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000003466 welding Methods 0.000 claims abstract description 14
- 239000011888 foil Substances 0.000 claims description 45
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000003698 laser cutting Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 5
- 235000015110 jellies Nutrition 0.000 description 3
- 239000008274 jelly Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000000126 substance Substances 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
- H01M10/052—Li-accumulators
-
- 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
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a lithium battery manufacturing method and a lithium battery, wherein the method comprises the following steps: laser slicing, forming of a tab, winding, combination of winding cores, welding of a connecting sheet, welding of a cover plate and forming of a battery. The lithium battery is prepared by the method. The invention has the advantages that: when the lithium battery manufacturing method is practically applied, the process of A/B winding core pairing is cancelled, waste caused by problems of wrong winding core pairing, unmatched quantity and the like is avoided, and product quality is greatly improved; the dependency of the traditional mode on the failure rate of the winding machine is broken through, and the limitation of the production capacity of the winding machine B when the winding machine for producing the winding core A fails is avoided; the lithium battery manufacturing method can cancel the existing roll core pairing equipment and improve the overall efficiency of the battery pack assembly line; greatly reduces the production cost and improves the space utilization rate of the factory building.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a lithium battery manufacturing method and a lithium battery.
Background
Lithium batteries refer to batteries that contain lithium (including metallic lithium, lithium alloys and lithium ions, lithium polymers) in an electrochemical system. In the prior art, for example, chinese patent publication No. CN102214844B discloses a square lithium battery, a winding core and a manufacturing method thereof, the method includes winding a pole piece group on a winding needle to form a semi-finished winding core, and folding the semi-finished winding core to form the winding core after the winding needle is drawn out.
Among the prior art, lithium ion's book core adopts winding forming's mode production more, then rolls up the mode that the core pairs through the A/B and constitutes the production battery, not only needs the winder of configuration A/B respectively, still needs the pairing machine of roll core configuration, and the A/B book core very easily appears pairing the confusion moreover, and the quantity does not match the scheduling problem, very big promotion that has hindered production efficiency and qualification rate seriously influences production quality, extravagant production resources.
Disclosure of Invention
The technical problem to be solved by the invention is as follows:
the technical problem that the production capacity of a winding machine B is limited when an A/B winding core in the prior art is mistakenly matched and the quantity of the A/B winding cores is not matched and the winding machine producing the A winding core is in failure.
The invention solves the technical problems through the following technical means:
a method for manufacturing a lithium battery includes the steps of:
s1, laser slicing: respectively carrying out laser slicing on the rolled positive and negative pole pieces, and cutting off foil areas at the edges of two sides of the pole pieces;
s2, forming a tab: carrying out laser cutting on a foil area in the middle of the pole piece, and forming an intermittent foil area in the foil area of the pole piece, wherein the foil area is a pole lug of the pole piece; a plurality of positive electrode lugs are formed on the positive electrode plate, and a plurality of negative electrode lugs are formed on the negative electrode plate;
s3, winding: winding the cut positive and negative pole pieces together with the pole lugs and the diaphragm to form a double-winding core, stacking all the wound positive pole lugs together, and stacking all the wound negative pole lugs together; the double-winding core comprises a first winding core and a second winding core, and the first winding core and the second winding core are connected through a stacked positive electrode lug and a stacked negative electrode lug;
s4, core combination: folding the first winding core and the second winding core along the anode tab and the cathode tab, and combining the first winding core and the second winding core to form a single large winding core;
s5, welding connecting sheets: respectively welding connecting sheets on a positive electrode lug and a negative electrode lug of the large winding core;
s6, welding a cover plate: welding a connecting sheet on the cover plate;
s7, battery molding: and placing the large winding core into a battery shell, and welding and sealing the cover plate and the periphery of the battery shell to form the lithium battery.
When the lithium battery manufacturing method is practically applied, the process of A/B winding core pairing is cancelled, waste caused by problems of wrong winding core pairing, unmatched quantity and the like is avoided, and product quality is greatly improved; the dependency of the traditional mode on the failure rate of the winding machine is broken through, and the limitation of the production capacity of the winding machine B when the winding machine for producing the winding core A fails is avoided; the lithium battery manufacturing method can cancel the existing roll core pairing equipment and improve the overall efficiency of the battery pack assembly line; greatly reduces the production cost and improves the space utilization rate of the factory building.
Preferably, in the step S1, the width of the foil area at the two side edges of the pole piece is not more than 0.5 mm.
Optimally, in the step S2, the distance between two adjacent positive electrode tabs on the positive electrode plate is unequal, the widths of all the positive electrode tabs are equal, the distance between two adjacent negative electrode tabs on the negative electrode plate is unequal, and the widths of all the negative electrode tabs are equal;
the interval between the positive pole utmost point ear and the interval between the negative pole utmost point ear satisfy: in step S3, all the wound positive electrode tabs are completely overlapped, and all the wound negative electrode tabs are completely overlapped.
Optimally, the rolled positive pole piece comprises a positive middle foil area, a first positive pole piece and a second positive pole piece are respectively arranged on two sides of the positive middle foil area, and positive edge foil areas are arranged at the outer edges of the first positive pole piece and the second positive pole piece;
the rolled negative pole piece comprises a negative middle foil area, a first negative pole piece and a second negative pole piece are respectively arranged on two sides of the negative middle foil area, and negative edge foil areas are arranged on the outer edges of the first negative pole piece and the second negative pole piece.
Preferably, in step S1, the positive electrode edge foil region and the negative electrode edge foil region are cut off.
Preferably, in the step S2, when the positive electrode plate is cut, two edges of the positive electrode plate are respectively cut to the inner edge of the first positive electrode plate and the inner edge of the second positive electrode plate;
when the negative pole piece is cut, two sides are respectively cut to the inner side edge of the first negative pole piece and the inner side edge of the second negative pole piece.
Preferably, in step S2, the cut-off portion is rectangular.
Preferably, in step S3, the double-winding core sequentially includes a negative diaphragm, a negative pole piece, a positive diaphragm, and a positive pole piece from the outer layer to the inner layer.
Preferably, in step S5, the connecting pieces are U-shaped, and the two connecting pieces are respectively clamped on the positive electrode tab and the negative electrode tab.
The U-shaped connecting sheet forms a buckle structure, and the coil core electrode lug and the connecting sheet adopt a buckle connection mode, so that the risk of falling of the connecting sheet is avoided, and the connection is more reliable.
The invention also discloses a lithium battery which is prepared by the manufacturing method of the lithium battery.
The invention has the advantages that:
1. when the lithium battery manufacturing method is practically applied, the process of A/B winding core pairing is cancelled, waste caused by problems of wrong winding core pairing, unmatched quantity and the like is avoided, and product quality is greatly improved; the dependency of the traditional mode on the failure rate of the winding machine is broken through, and the limitation of the production capacity of the winding machine B when the winding machine for producing the winding core A fails is avoided; the lithium battery manufacturing method can cancel the existing roll core pairing equipment and improve the overall efficiency of the battery pack assembly line; greatly reduces the production cost and improves the space utilization rate of the factory building.
The U-shaped connecting sheet forms a buckle structure, and the winding core lug and the connecting sheet adopt a buckle connection mode, so that the risk of falling of the connecting sheet is avoided, and the connection is reliable.
Drawings
FIG. 1 is a schematic diagram of a rolled positive electrode sheet according to an embodiment of the present invention;
FIG. 2 is a schematic view of a rolled negative electrode sheet according to an embodiment of the present invention;
FIG. 3 is a schematic view of a positive electrode tab in an embodiment of the invention;
fig. 4 is a schematic view of a negative electrode tab in an embodiment of the invention;
FIG. 5 is a schematic diagram of a dual core structure in an embodiment of the invention;
FIG. 6 is a schematic cross-sectional view of a dual jelly roll in an embodiment of the present invention;
FIG. 7 is a schematic view of a large jelly roll in an embodiment of the present invention;
FIG. 8 is a schematic view of a welding tab on the positive electrode tab according to an embodiment of the present invention;
FIG. 9 is a schematic view of a positive electrode tab and a negative electrode tab both welded with connecting pieces according to an embodiment of the invention;
FIGS. 10 and 11 are schematic perspective views illustrating a connecting sheet welded to a cover plate according to an embodiment of the present invention;
FIGS. 12 and 13 are a top view and a front view, respectively, of a connecting piece of an embodiment of the present invention welded to a cover plate;
FIG. 14 is a schematic view of a battery produced in an example of the present invention;
wherein the content of the first and second substances,
a positive pole piece-1; positive intermediate foil region-11; a first positive electrode tab-12; a second positive electrode tab-13; positive edge foil region-14; a positive electrode tab-15; positive separator-16;
a negative pole piece-2; negative intermediate foil region-21; a first negative electrode tab-22; a second negative electrode tab-23; negative edge foil region-24; a negative electrode tab-25; a negative separator-26;
a double winding core-3; a first spool-31; a second winding core-32;
a large roll core-4;
connecting sheet-5;
a cover plate-6; a positive pole post-61; a negative electrode post-62; a liquid injection hole-63;
a battery case-7;
lithium battery-8.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. 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.
A method for manufacturing a lithium battery includes the steps of:
s1 laser dicing
As shown in fig. 1, the rolled positive electrode sheet 1 includes a positive electrode middle foil region 11, a first positive electrode sheet 12 and a second positive electrode sheet 13 are respectively disposed on two sides of the positive electrode middle foil region 11, and a positive electrode edge foil region 14 is disposed at outer edges of the first positive electrode sheet 12 and the second positive electrode sheet 13.
As shown in fig. 2, the rolled negative electrode plate 2 includes a negative electrode middle foil region 21, a first negative electrode plate 22 and a second negative electrode plate 23 are respectively disposed on two sides of the negative electrode middle foil region 21, and a negative electrode edge foil region 24 is disposed at outer side edges of the first negative electrode plate 22 and the second negative electrode plate 23.
And respectively carrying out laser slicing on the rolled positive and negative pole pieces, and cutting off foil areas at the edges of the two sides of the pole pieces, namely cutting off the foil area 14 at the edge of the positive pole and the foil area 24 at the edge of the negative pole, wherein the width of the foil areas at the edges of the two sides of the pole pieces is not more than 0.5 mm.
S2, forming tab
As shown in fig. 3 and 4, the foil area in the middle of the pole piece is subjected to laser cutting, and a discontinuous foil area is formed in the foil area of the pole piece, namely, the tab of the pole piece; the cut-out portion is rectangular.
As shown in fig. 3, when the positive electrode plate 1 is cut, two sides are cut to the inner side edge of the first positive electrode plate 12 and the inner side edge of the second positive electrode plate 13 respectively; as shown in fig. 4, when the negative electrode plate 2 is cut, two sides are cut to the inner side edge of the first negative electrode plate 22 and the inner side edge of the second negative electrode plate 23, respectively.
As shown in fig. 3 and 4, a plurality of positive electrode tabs 15 are formed on the positive electrode plate 1, and a plurality of negative electrode tabs 25 are formed on the negative electrode plate 2; the distance between two adjacent positive electrode lugs 15 on the positive electrode pole piece 1 is unequal, the widths of all the positive electrode lugs 15 are equal, the distance between two adjacent negative electrode lugs 25 on the negative electrode pole piece 2 is unequal, and the widths of all the negative electrode lugs 25 are equal; the distance between the positive electrode tabs 15 and the distance between the negative electrode tabs 25 satisfy: in step S3, all the wound positive electrode tabs 15 are completely overlapped, and all the wound negative electrode tabs 25 are completely overlapped.
S3, winding
Winding the cut positive and negative electrode plates together with the tabs and the separator to form a double-winding core 3 as shown in fig. 5, wherein all the wound positive electrode tabs 15 are stacked together and all the wound negative electrode tabs 25 are stacked together as shown in fig. 6; the double-winding core 3 sequentially comprises a negative diaphragm 26, a negative pole piece 2, a positive diaphragm 16 and a positive pole piece 1 from the outer layer to the inner layer.
The double-winding core 3 includes a first winding core 31 and a second winding core 32, and the first winding core 31 and the second winding core 32 are connected by the stacked positive electrode tab 15 and the stacked negative electrode tab 25, that is, in a state shown in fig. 5.
S4 core combination
The first winding core 31 and the second winding core 32 are folded in two along the positive electrode tab 15 and the negative electrode tab 25, and the first winding core 31 and the second winding core 32 are combined to form a single large winding core 4, that is, the state shown in fig. 7.
S5, welding connecting sheet
As shown in fig. 8 and 9, the positive electrode tab 15 and the negative electrode tab 25 of the large winding core 4 are respectively welded with the connecting pieces 5; the connecting sheets 5 are U-shaped, and the two connecting sheets 5 are respectively clamped on the positive pole lug 15 and the negative pole lug 25.
S6 welding cover plate
The connecting sheet 5 is welded to the cover plate 6, as shown in fig. 10-13, and as shown in fig. 10, the cover plate 6 is rectangular and is provided with a positive electrode post 61, a negative electrode post 62 and a liquid injection hole 63.
S7, battery molding
The large jelly roll 4 is put into a battery case 7, the battery case 7 is an aluminum case, and the cover plate 6 is welded and sealed with the periphery of the battery case 7 to form a lithium battery 8, that is, the state shown in fig. 14. In the method for manufacturing the lithium battery, other parts which are not disclosed can be realized by adopting the prior art.
The invention also discloses a lithium battery prepared by the method.
When the lithium battery manufacturing method is practically applied, the process of A/B winding core pairing is cancelled, waste caused by problems of wrong winding core pairing, unmatched quantity and the like is avoided, and product quality is greatly improved; the dependency of the traditional mode on the failure rate of the winding machine is broken through, and the limitation of the production capacity of the winding machine B when the winding machine for producing the winding core A fails is avoided; the lithium battery manufacturing method can cancel the existing roll core pairing equipment and improve the overall efficiency of the battery pack assembly line; greatly reduces the production cost and improves the space utilization rate of the factory building.
The U-shaped connecting sheet 5 forms a buckle structure, and the coil core electrode lug and the connecting sheet adopt a buckle connection mode, so that the risk of falling of the connecting sheet is avoided, and the connection is more reliable.
The invention has simple structure, mainly optimizes the process of cutting the pole ear by laser, changes the original slitting process, realizes the process of cutting the pole ear of the bipolar plate simultaneously without slitting, namely, the pole ears of the two pole pieces are connected together without cutting; in the winding process, the pole piece after laser cutting is wound, double winding cores are simultaneously wound, namely, the winding is performed once, the double winding cores can be produced, the lugs of the double winding cores are connected together, and the double winding cores form a whole. The invention can optimize the equipment of the existing roll core assembling procedure, namely, can omit the roll core matching equipment, avoid the problems of production resource waste and the like caused by wrong matching of the roll cores, greatly improve the production effect and reduce the cost.
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 (10)
1. A method for manufacturing a lithium battery is characterized in that: the method comprises the following steps:
s1, laser slicing: respectively carrying out laser slicing on the rolled positive and negative pole pieces, and cutting off foil areas at the edges of two sides of the pole pieces;
s2, forming a tab: carrying out laser cutting on a foil area at the middle part of the pole piece, and forming a discontinuous foil area in the foil area of the pole piece, wherein the foil area is a pole lug of the pole piece; a plurality of positive pole lugs (15) are formed on the positive pole piece (1), and a plurality of negative pole lugs (25) are formed on the negative pole piece (2);
s3, winding: winding the cut positive and negative pole pieces together with the lugs and the diaphragm to form a double-winding core (3), stacking all the wound positive pole lugs (15) together, and stacking all the wound negative pole lugs (25) together; the double-winding core (3) comprises a first winding core (31) and a second winding core (32), and the first winding core (31) and the second winding core (32) are connected through a stacked positive pole lug (15) and a stacked negative pole lug (25);
s4, core combination: folding the first winding core (31) and the second winding core (32) along the anode tab (15) and the cathode tab (25), and combining the first winding core (31) and the second winding core (32) to form a single large winding core (4);
s5, welding connecting sheets: connecting sheets (5) are respectively welded on a positive electrode tab (15) and a negative electrode tab (25) of the large winding core (4);
s6, welding a cover plate: welding the connecting sheet (5) on the cover plate (6);
s7, battery molding: and (3) placing the large winding core (4) into a battery shell (7), and welding and sealing the cover plate (6) and the periphery of the battery shell (7) to form the lithium battery (8).
2. The method of manufacturing a lithium battery according to claim 1, wherein: in the step S1, the width of the foil area at the two side edges of the pole piece is not more than 0.5 mm.
3. The method of manufacturing a lithium battery according to claim 1, wherein: in the step S2, the distance between two adjacent positive electrode tabs (15) on the positive electrode plate (1) is unequal, the widths of all the positive electrode tabs (15) are equal, the distance between two adjacent negative electrode tabs (25) on the negative electrode plate (2) is unequal, and the widths of all the negative electrode tabs (25) are equal;
the distance between the positive electrode lugs (15) and the distance between the negative electrode lugs (25) meet the following requirements: in step S3, all the wound positive electrode tabs (15) are completely overlapped, and all the wound negative electrode tabs (25) are completely overlapped.
4. The method of manufacturing a lithium battery according to claim 1, wherein: the rolled positive pole piece (1) comprises a positive middle foil area (11), a first positive pole piece (12) and a second positive pole piece (13) are respectively arranged on two sides of the positive middle foil area (11), and positive edge foil areas (14) are arranged on the outer side edges of the first positive pole piece (12) and the second positive pole piece (13);
the rolled negative pole piece (2) comprises a negative pole middle foil area (21), a first negative pole piece (22) and a second negative pole piece (23) are respectively arranged on two sides of the negative pole middle foil area (21), and negative pole edge foil areas (24) are arranged at the outer side edges of the first negative pole piece (22) and the second negative pole piece (23).
5. The method of manufacturing a lithium battery according to claim 4, wherein: in step S1, the positive electrode edge foil region (14) and the negative electrode edge foil region (24) are cut off.
6. The method of manufacturing a lithium battery according to claim 4, wherein: in the step S2, when the positive electrode sheet (1) is cut, two edges of the positive electrode sheet are respectively cut to the inner side edge of the first positive electrode sheet (12) and the inner side edge of the second positive electrode sheet (13);
when the negative pole piece (2) is cut, two sides are respectively cut to the inner side edge of the first negative pole piece (22) and the inner side edge of the second negative pole piece (23).
7. The method of manufacturing a lithium battery according to claim 1, wherein: in step S2, the cut-out portion is rectangular.
8. The method of manufacturing a lithium battery according to claim 1, wherein: in the step S3, the double-winding core (3) sequentially comprises a negative diaphragm (26), a negative pole piece (2), a positive diaphragm (16) and a positive pole piece (1) from the outer layer to the inner layer.
9. The method of manufacturing a lithium battery according to claim 1, wherein: in the step S5, the connecting pieces (5) are U-shaped, and the two connecting pieces (5) are respectively clamped on the positive electrode tab (15) and the negative electrode tab (25).
10. A lithium battery, characterized in that: a lithium battery manufactured by the method for manufacturing a lithium battery as claimed in any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114975885A (en) * | 2022-06-13 | 2022-08-30 | 惠州锂威新能源科技有限公司 | Preparation method of tab pole piece, battery cell and lithium ion battery |
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