CN116565294A - Manufacturing method of multipolar lug cylindrical lithium ion battery cell and battery - Google Patents
Manufacturing method of multipolar lug cylindrical lithium ion battery cell and battery Download PDFInfo
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- CN116565294A CN116565294A CN202310684111.8A CN202310684111A CN116565294A CN 116565294 A CN116565294 A CN 116565294A CN 202310684111 A CN202310684111 A CN 202310684111A CN 116565294 A CN116565294 A CN 116565294A
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- negative electrode
- positive electrode
- plate
- electrode tab
- positive
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 28
- 238000004804 winding Methods 0.000 claims abstract description 76
- 238000003466 welding Methods 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- 230000005405 multipole Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000010405 anode material Substances 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 description 34
- 239000007774 positive electrode material Substances 0.000 description 28
- 238000000576 coating method Methods 0.000 description 9
- 239000012528 membrane Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
-
- 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
- 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
Abstract
A manufacturing method of a multi-lug cylindrical lithium ion battery cell, a battery and the battery thereof, wherein the manufacturing method of the battery cell comprises the following steps: s1, arranging N anode tabs which are separated by a preset distance on an anode sheet, wherein N is an integer greater than or equal to 3; s2, arranging a plurality of positive electrode lugs on the positive electrode plate; s3, separating and winding the positive plate and the negative plate by using a diaphragm, and freeing the positive plate from the position corresponding to the negative electrode lug of the negative plate to manufacture the battery cell. The invention has the advantage that the cathode tab can not be partially overlapped with the anode material on the anode plate.
Description
Technical Field
The invention relates to the field of battery manufacturing, in particular to a multi-lug cylindrical lithium ion battery cell, a manufacturing method of the battery and the battery.
Background
The current cylindrical lithium ion battery generates heat due to fewer lugs, and the heat of the battery is more serious when the capacity and the diameter of the battery are increased. Therefore, there is a need for reducing the internal resistance of the battery to reduce heat generation while increasing the diameter of the battery. Currently, the common way to reduce the internal resistance of a battery is to use a multipolar tab and full tab scheme. The full tab scheme can effectively reduce the internal resistance of the battery, but has a plurality of problems in welding and assembly, and is not promoted in a large area. In the prior art, the manufacturing technology of the positive electrode multi-pole lug in the cylindrical lithium ion battery is mature, and the general manufacturing method of the negative electrode multi-pole lug is as follows: firstly, welding a plurality of lugs on one side of a negative electrode plate with a preset length to form a negative electrode lug, forming a plurality of positive electrode lugs on one side of a positive electrode plate with a preset length, sequentially overlapping a first diaphragm, the negative electrode plate, a second diaphragm and the positive electrode plate, winding into a battery cell, folding or flattening the negative electrode lug, welding a current collecting plate on the folded or flattened negative electrode lug, loading the battery cell welded with the current collecting plate into a steel shell, and welding the current collecting plate and the inner bottom surface of the steel shell in a spot welding mode. The method for manufacturing the cylindrical lithium battery with the negative electrode tab has the following problems that the position of the negative electrode tab corresponding to the positive electrode sheet can cause the phenomenon of lithium precipitation on the negative electrode tab at the position in the use process of the battery, and potential safety hazards exist; in order to solve the problem, some attempts are made to carry out block coating on the positive plate, namely intermittent coating is adopted when the positive plate is coated, a gap slightly larger than the width of the negative electrode lug is reserved between two coated positive electrode materials, when a battery core is wound, the negative electrode lug is just aligned to the gap, and the problem of lithium precipitation cannot occur because the positive electrode material does not exist at the gap position of the positive plate corresponding to the negative electrode lug, however, the method has the problem that the positive electrode lug which is difficult to control corresponds to the gap in actual use, and if the correspondence is poor, the lithium precipitation phenomenon can occur; in addition, the method has high requirements on the coating of the positive electrode material on the positive electrode plate, the consistency of the battery quality is difficult to ensure in actual production, and the qualification rate of the battery is not high.
Disclosure of Invention
The invention aims to provide a multi-lug cylindrical lithium ion battery cell, a manufacturing method of the battery and the battery, wherein the multi-lug cylindrical lithium ion battery cell can realize that a negative electrode lug can not be partially overlapped with a positive electrode material on a positive electrode plate.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the manufacturing method of the multi-lug cylindrical lithium ion battery cell comprises the following steps:
s1, arranging N anode tabs which are separated by a preset distance on an anode sheet, wherein N is an integer greater than or equal to 3;
s2, arranging a plurality of positive electrode lugs on the positive electrode plate;
s3, separating and winding the positive plate and the negative plate by using a diaphragm, and freeing the positive plate from the position corresponding to the negative electrode lug of the negative plate to manufacture the battery cell.
Specifically, the step S3 may be two methods, where after the first separator and the second separator are wound by a predetermined length by using a winding machine, a negative electrode sheet is inserted between the first separator and the second separator, and when the first negative electrode tab just wound around the negative electrode sheet is continuously wound, a positive electrode sheet is inserted on the second separator, where the positive electrode sheet cannot overlap with the first negative electrode tab; when the winding is continued until the second negative electrode tab of the negative electrode tab is just reached, the positive electrode tab is cut off, and at the moment, the positive electrode tab cannot be overlapped with the second negative electrode tab; when the positive plate is continuously wound to the second negative electrode tab which just bypasses the negative plate, the positive plate is inserted into the second diaphragm again, and at the moment, the positive plate cannot be overlapped with the second negative electrode tab; so, repeatedly winding until the total length of the negative electrode plate designed by the battery is reached, cutting off the positive electrode plate when the last negative electrode tab of the negative electrode plate arrives, wherein the positive electrode plate cannot be overlapped with the last negative electrode tab; continuing winding until the last negative electrode tab is completely wound, and cutting off the negative electrode sheet; then intermittently winding the first diaphragm or/and the second diaphragm by more than one roll, wrapping the diaphragm on the surface of the battery cell, and cutting off the diaphragm; and manufacturing the battery cell.
The second method is that after the first diaphragm and the second diaphragm are coiled for a preset length by a coiling machine, a negative electrode plate is inserted between the first diaphragm and the second diaphragm, when the coiling is continued until a first negative electrode tab which just bypasses the negative electrode plate, a positive electrode plate is inserted on the second diaphragm, and at the moment, the positive electrode plate cannot be overlapped with the first negative electrode tab; the positive electrode material on the positive electrode plate is a piece of positive electrode material block which is coated in advance by an intermittent coating method, a blank gap with a preset width is arranged between two adjacent positive electrode material blocks, and when a winding machine is arranged to continuously wind the positive electrode plate to just reach the second negative electrode tab of the negative electrode plate, the blank gap on the positive electrode plate is just aligned with the second negative electrode tab, so that the positive electrode material on the positive electrode plate cannot be overlapped with the second negative electrode tab; so, repeatedly winding until the total length of the negative electrode plate designed by the battery is reached, cutting off the positive electrode plate when the last negative electrode tab of the negative electrode plate arrives, wherein the positive electrode plate cannot be overlapped with the last negative electrode tab; continuing winding until the last negative electrode tab is completely wound, and cutting off the negative electrode sheet; then intermittently winding the first diaphragm or/and the second diaphragm by more than one roll, wrapping the diaphragm on the surface of the battery cell, and cutting off the diaphragm; and manufacturing the battery cell.
The invention also discloses a manufacturing method of the multi-lug cylindrical lithium ion battery, which comprises the following steps:
s1, arranging N anode tabs which are separated by a preset distance on an anode sheet, wherein N is an integer greater than or equal to 3;
s2, arranging a plurality of positive electrode lugs on the positive electrode plate;
s3, separating and winding the positive plate and the negative plate by using a diaphragm, and freeing the positive plate from the position corresponding to the negative electrode lug of the negative plate to manufacture the battery cell.
Specifically, the step S3 may be two methods, where after the first separator and the second separator are wound by a predetermined length by using a winding machine, a negative electrode sheet is inserted between the first separator and the second separator, and when the first negative electrode tab just wound around the negative electrode sheet is continuously wound, a positive electrode sheet is inserted on the second separator, where the positive electrode sheet cannot overlap with the first negative electrode tab; when the winding is continued until the second negative electrode tab of the negative electrode tab is just reached, the positive electrode tab is cut off, and at the moment, the positive electrode tab cannot be overlapped with the second negative electrode tab; when the positive plate is continuously wound to the second negative electrode tab which just bypasses the negative plate, the positive plate is inserted into the second diaphragm again, and at the moment, the positive plate cannot be overlapped with the second negative electrode tab; so, repeatedly winding until the total length of the negative electrode plate designed by the battery is reached, cutting off the positive electrode plate when the last negative electrode tab of the negative electrode plate arrives, wherein the positive electrode plate cannot be overlapped with the last negative electrode tab; continuing winding until the last negative electrode tab is completely wound, and cutting off the negative electrode sheet; then intermittently winding the first diaphragm or/and the second diaphragm by more than one roll, wrapping the diaphragm on the surface of the battery cell, and cutting off the diaphragm; manufacturing an electric core;
the second method is that after the first diaphragm and the second diaphragm are coiled for a preset length by a coiling machine, a negative electrode plate is inserted between the first diaphragm and the second diaphragm, when the coiling is continued until a first negative electrode tab which just bypasses the negative electrode plate, a positive electrode plate is inserted on the second diaphragm, and at the moment, the positive electrode plate cannot be overlapped with the first negative electrode tab; the positive electrode material on the positive electrode plate is a piece of positive electrode material block which is coated in advance by an intermittent coating method, a blank gap with a preset width is arranged between two adjacent positive electrode material blocks, and when a winding machine is arranged to continuously wind the positive electrode plate to just reach the second negative electrode tab of the negative electrode plate, the blank gap on the positive electrode plate is just aligned with the second negative electrode tab, so that the positive electrode material on the positive electrode plate cannot be overlapped with the second negative electrode tab; so, repeatedly winding until the total length of the negative electrode plate designed by the battery is reached, cutting off the positive electrode plate when the last negative electrode tab of the negative electrode plate arrives, wherein the positive electrode plate cannot be overlapped with the last negative electrode tab; continuing winding until the last negative electrode tab is completely wound, and cutting off the negative electrode sheet; then intermittently winding the first diaphragm or/and the second diaphragm by more than one roll, wrapping the diaphragm on the surface of the battery cell, and cutting off the diaphragm; manufacturing an electric core;
s4, folding and pressing the negative electrode tab towards the direction of the center hole of the battery cell, so that the negative electrode tab covers the center hole;
s5, loading the semi-finished cylindrical battery cell manufactured in the S4 into a steel shell, and enabling the negative electrode lug to be abutted against the inner bottom surface of the steel shell;
s6, inserting a welding needle of an ultrasonic welder from a center hole of the positive end of the semi-finished cylindrical battery cell to enable a welding needle head of the welding needle to press the negative electrode tab on the inner bottom surface of the steel shell; starting an ultrasonic welder to weld the negative electrode lug on the inner bottom surface of the steel shell;
and S7, electrically connecting the multi-lug positive electrode with a battery positive electrode cover plate, and arranging a sealing piece between the battery positive electrode cover plate and the upper end of the steel shell to form the multi-lug cylindrical lithium ion battery.
As an improvement of the invention, the diameter of the circle center hole is selected from more than or equal to 4mm and less than or equal to 10 mm.
As an improvement of the invention, the diameter of the center hole is selected from 5mm-9 mm.
As an improvement of the invention, the power of the ultrasonic welder is more than or equal to 200 watts and less than or equal to 2000 watts; the vibration frequency is 40KHz or more and 410KHz or less.
As an improvement of the invention, the length of the welding needle of the ultrasonic welder is more than or equal to 90mm and less than or equal to 200mm; the diameter of the welding needle is more than or equal to 2.5mm and less than or equal to 9mm; the end face of the free end of the welding needle head of the welding needle is provided with patterns.
As an improvement of the invention, the pattern is raised ball points or raised grid patterns.
The invention also provides a multi-lug cylindrical lithium ion battery, which is manufactured by the manufacturing method of the multi-lug cylindrical lithium ion battery.
According to the invention, the positive plate is cut off and avoids the position of the negative electrode tab when the battery cell is wound to the position corresponding to the negative electrode tab of the negative electrode plate, so that the positive plate is ensured not to overlap with the negative electrode tab, and the problem of lithium precipitation can be completely avoided.
Drawings
Fig. 1 is a block diagram schematically illustrating an embodiment of a method for manufacturing a battery cell according to the present invention.
Fig. 2 is a schematic view of an expanded structure of an embodiment of a cell of the present invention.
Fig. 3 is a schematic perspective view of the embodiment of fig. 2 after winding.
Fig. 4 is a schematic view of an expanded structure of another embodiment of the cell of the present invention.
Fig. 5 is a block diagram schematically illustrating an embodiment of a method for manufacturing a battery according to the present invention.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1-3, fig. 1-3 disclose a manufacturing method of a multi-pole cylindrical lithium ion battery cell, comprising the following steps:
s1, arranging N anode tabs 11 which are separated by a preset distance on an anode sheet 10, wherein N is an integer greater than or equal to 3; in the present invention, the negative electrode tab 11 is welded on the negative electrode sheet 10, and the negative electrode tab 11 may be a nickel sheet, a nickel-plated steel sheet or a copper sheet (hereinafter the same);
s2, arranging a plurality of positive electrode lugs 21 on the positive electrode plate 20; in the present invention, the positive electrode tab 21 is welded on the positive electrode sheet 20, and the positive electrode tab 21 may be a nickel sheet, a nickel-plated steel sheet or a copper sheet (the same applies below);
s3, separating the positive electrode plate 20 from the negative electrode plate 10 by using a diaphragm, winding the positive electrode plate 20 by using the diaphragm 30, and leaving the positive electrode plate 20 at a position 22 corresponding to the negative electrode tab 11 of the negative electrode plate 10 to manufacture the battery cell.
Referring to fig. 2, fig. 2 is a schematic diagram showing an expanded structure of one embodiment of the battery cell of the present invention. As can be seen from fig. 2, three negative electrode tabs 11, namely a first negative electrode tab 111, a second negative electrode tab 112 and a third negative electrode tab 113, are provided on the negative electrode sheet 10; during winding, the first separator 31 and the second separator 32 are wound by a predetermined length (for example, one or two turns are wound, the same applies hereinafter), then the negative electrode sheet 20 is inserted between the first separator 31 and the second separator 32, and when the winding is continued until the positive electrode sheet 20 just bypasses the first negative electrode tab 111 of the negative electrode sheet 10, the positive electrode sheet 20 is inserted into the second separator 32, and at this time, the positive electrode sheet 20 cannot overlap the first negative electrode tab 111 (i.e., the positive electrode sheet 20 avoids the position corresponding to the first negative electrode tab 111, the same applies hereinafter); when the winding is continued until the second negative electrode tab 112 of the negative electrode sheet 10 is just reached, the winding machine cuts off the positive electrode sheet 20, and at this time, the positive electrode sheet 20 cannot be overlapped with the second negative electrode tab 112; when the winding is continued until the second negative electrode tab 112 just bypasses the negative electrode tab 10, the positive electrode tab 20 is inserted into the second diaphragm 32 again, and at this time, the positive electrode tab 20 cannot overlap with the second negative electrode tab 112 (i.e., the positive electrode tab 20 avoids the position corresponding to the second negative electrode tab 112); when the winding is continued until the third negative electrode tab 113 of the negative electrode tab 10 is just reached, the winding machine cuts off the positive electrode tab 20 again, and at this time, the positive electrode tab 20 cannot overlap with the third negative electrode tab 113 (i.e., the positive electrode tab 20 avoids the position corresponding to the third negative electrode tab 113); continuing to wind until the third negative electrode tab 113 is passed, cutting off the negative electrode sheet 10, continuing to wind the diaphragm 30 for one or two circles, cutting off the diaphragm 30, and sticking the tail end of the diaphragm 30 on the surface of the battery cell by using an adhesive tape to obtain the battery cell, thus obtaining the battery cell of the three negative electrode tabs.
The invention can also adopt a second method to manufacture the battery cell (not shown), wherein after the first diaphragm and the second diaphragm are coiled for a preset length by a coiling machine, a negative electrode plate is inserted between the first diaphragm and the second diaphragm, and when the first negative electrode tab which just bypasses the negative electrode plate is coiled continuously, a positive electrode plate is inserted on the second diaphragm, and at the moment, the positive electrode plate cannot be overlapped with the first negative electrode tab; the positive electrode material on the positive electrode plate is a piece of positive electrode material block which is coated in advance by an intermittent coating method, a blank gap with a preset width (for example, 15 mm) is arranged between two adjacent positive electrode material blocks, and when the winding machine is continuously wound to just reach the second negative electrode tab of the negative electrode plate, the blank gap on the positive electrode plate is just aligned with the second negative electrode tab, so that the positive electrode material on the positive electrode plate cannot be overlapped with the second negative electrode tab; when the positive electrode plate is continuously wound to the third negative electrode tab of the negative electrode plate, the positive electrode plate is cut off, and the positive electrode plate cannot be overlapped with the third negative electrode tab; continuing winding until the third negative electrode tab is completely wound, and cutting off the negative electrode sheet; then intermittently winding the first diaphragm or/and the second diaphragm by more than one roll, wrapping the diaphragm on the surface of the battery cell, and cutting off the diaphragm; the battery cell is manufactured, and the battery cell with three cathode lugs is manufactured.
A schematic diagram of the cell made by the two methods is shown in FIG. 3.
Referring to fig. 4, fig. 4 is a schematic view showing an expanded structure of another embodiment of the battery cell according to the present invention. As can be seen from fig. 4, N negative electrode tabs 11 are provided on the negative electrode sheet 10, where N is an integer greater than or equal to 3, and is a first negative electrode tab 111, a second negative electrode tab 112, a third negative electrode tab 113, and an nth negative electrode tab 11N, respectively, and a plurality of intermediate negative electrode tabs 11M are provided between the third negative electrode tab and the nth negative electrode tab 11N; during winding, the first separator 31 and the second separator 32 are wound by a predetermined length (one or two turns) by a winding machine, then the negative electrode sheet 10 is inserted between the first separator 31 and the second separator 32, and when the winding is continued to the first negative electrode tab 111 which just bypasses the negative electrode sheet 10, the positive electrode sheet 20 is inserted on the second separator 32, and at this time, the positive electrode sheet 20 cannot overlap with the first negative electrode tab (i.e., the positive electrode sheet 20 avoids the position corresponding to the first negative electrode tab 111); when the winding is continued until the second negative electrode tab 112 of the negative electrode sheet 10 is just reached, the winding machine cuts off the positive electrode sheet 20, and at this time, the positive electrode sheet 20 cannot overlap with the second negative electrode tab 112 (i.e., the positive electrode sheet 20 avoids the position corresponding to the second negative electrode tab 112); when the winding is continued until the second negative electrode tab 112 just bypasses the negative electrode tab 10, the positive electrode tab 20 is inserted into the second diaphragm 32 again, and at this time, the positive electrode tab 20 cannot overlap with the second negative electrode tab 112; continuing to wind until the third negative electrode tab 113 of the negative electrode sheet 10 is just reached, cutting off the positive electrode sheet 20 by the winding machine, repeating winding until the total length of the negative electrode sheet designed by the battery is reached, cutting off the positive electrode sheet 20 when the last negative electrode tab (namely the Nth negative electrode tab 11N) of the negative electrode sheet 10 is reached, wherein the positive electrode sheet 20 cannot be overlapped with the last negative electrode tab; continuing winding until the last negative electrode lug is completely wound, and cutting off the negative electrode piece 10; intermittently wrapping the first membrane 31 or/and the second membrane 32 for more than one circle to wrap the membrane on the surface of the battery cell, cutting off the membrane 30, and sticking the adhesive tape; and manufacturing the battery cell.
The manufacturing method of the battery cell can also be that after the first diaphragm and the second diaphragm are wound for a preset length by a winding machine, a negative electrode plate is inserted between the first diaphragm and the second diaphragm, when the battery cell is continuously wound to a first negative electrode tab which just bypasses the negative electrode plate, a positive electrode plate is inserted on the second diaphragm, and at the moment, the positive electrode plate cannot be overlapped with the first negative electrode tab; the positive electrode material on the positive electrode plate is a piece of positive electrode material block which is coated in advance by an intermittent coating method, a blank gap with a preset width is arranged between two adjacent positive electrode material blocks, and when a winding machine is arranged to continuously wind the positive electrode plate to just reach the second negative electrode tab of the negative electrode plate, the blank gap on the positive electrode plate is just aligned with the second negative electrode tab, so that the positive electrode material on the positive electrode plate cannot be overlapped with the second negative electrode tab; so, repeatedly winding until the total length of the negative electrode plate designed by the battery is reached, cutting off the positive electrode plate when the last negative electrode tab of the negative electrode plate arrives, wherein the positive electrode plate cannot be overlapped with the last negative electrode tab; continuing winding until the last negative electrode tab is completely wound, and cutting off the negative electrode sheet; then intermittently winding the first diaphragm or/and the second diaphragm by more than one roll, wrapping the diaphragm on the surface of the battery cell, and cutting off the diaphragm; and manufacturing the battery cell.
Referring to fig. 1-5, fig. 5 is a schematic block diagram illustrating an embodiment of a method for manufacturing a battery according to the present invention. The manufacturing method of the multi-pole ear cylindrical lithium ion battery disclosed in fig. 1-5 is the same as the manufacturing method, and the steps S4-S7 are added on the basis of the manufacturing method of the battery core, so that the manufacturing method of the power generation pool comprises the following steps:
s1, arranging N anode tabs 11 which are separated by a preset distance on an anode sheet 10, wherein N is an integer greater than or equal to 3;
s2, arranging a plurality of positive electrode lugs 21 on the positive electrode plate 20;
s3, separating the positive electrode plate 20 from the negative electrode plate 10 by using a diaphragm, winding the positive electrode plate 20 by using the diaphragm 30, and leaving the positive electrode plate 20 at a position 22 corresponding to the negative electrode tab 11 of the negative electrode plate 10 to manufacture the battery cell.
Referring to fig. 2, fig. 2 is a schematic diagram showing an expanded structure of one embodiment of the battery cell of the present invention. As can be seen from fig. 2, three negative electrode tabs 11, namely a first negative electrode tab 111, a second negative electrode tab 112 and a third negative electrode tab 113, are provided on the negative electrode sheet 10; during winding, the first separator 31 and the second separator 32 are wound by a predetermined length (for example, one or two turns) by a winding machine, then the negative electrode sheet 20 is inserted between the first separator 31 and the second separator 32, and when the winding is continued until the positive electrode sheet 20 just bypasses the first negative electrode tab 111 of the negative electrode sheet 10, the positive electrode sheet 20 is inserted into the second separator 32, and at this time, the positive electrode sheet 20 cannot overlap the first negative electrode tab 111 (i.e., the positive electrode sheet 20 avoids the position corresponding to the first negative electrode tab 111); when the winding is continued until the second negative electrode tab 112 of the negative electrode sheet 10 is just reached, the winding machine cuts off the positive electrode sheet 20, and at this time, the positive electrode sheet 20 cannot be overlapped with the second negative electrode tab 112; when the winding is continued until the second negative electrode tab 112 just bypasses the negative electrode tab 10, the positive electrode tab 20 is inserted into the second diaphragm 32 again, and at this time, the positive electrode tab 20 cannot overlap with the second negative electrode tab 112 (i.e., the positive electrode tab 20 avoids the position corresponding to the second negative electrode tab 112); when the winding is continued until the third negative electrode tab 113 of the negative electrode tab 10 is just reached, the winding machine cuts off the positive electrode tab 20 again, and at this time, the positive electrode tab 20 cannot overlap with the third negative electrode tab 113 (i.e., the positive electrode tab 20 avoids the position corresponding to the third negative electrode tab 113); continuing to wind until the third negative electrode tab 113 is passed, cutting off the negative electrode sheet 10, continuing to wind the diaphragm 30 for one or two circles, cutting off the diaphragm 30, and sticking the tail end of the diaphragm 30 on the surface of the battery cell by using an adhesive tape to obtain the battery cell, thus obtaining the battery cell of the three negative electrode tabs.
The invention can also adopt a second method to manufacture the battery cell (not shown), wherein after the first diaphragm and the second diaphragm are coiled for a preset length by a coiling machine, a negative electrode plate is inserted between the first diaphragm and the second diaphragm, and when the first negative electrode tab which just bypasses the negative electrode plate is coiled continuously, a positive electrode plate is inserted on the second diaphragm, and at the moment, the positive electrode plate cannot be overlapped with the first negative electrode tab; the positive electrode material on the positive electrode plate is a piece of positive electrode material block which is coated in advance by an intermittent coating method, a blank gap with a preset width (for example, 15 mm) is arranged between two adjacent positive electrode material blocks, and when the winding machine is continuously wound to just reach the second negative electrode tab of the negative electrode plate, the blank gap on the positive electrode plate is just aligned with the second negative electrode tab, so that the positive electrode material on the positive electrode plate cannot be overlapped with the second negative electrode tab; when the positive electrode plate is continuously wound to the third negative electrode tab of the negative electrode plate, the positive electrode plate is cut off, and the positive electrode plate cannot be overlapped with the third negative electrode tab; continuing winding until the third negative electrode tab is completely wound, and cutting off the negative electrode sheet; then intermittently winding the first diaphragm or/and the second diaphragm by more than one roll, wrapping the diaphragm on the surface of the battery cell, and cutting off the diaphragm; the battery cell is manufactured, and the battery cell with three cathode lugs is manufactured.
A schematic diagram of the cell made by the method is shown in FIG. 3.
Referring to fig. 4, fig. 4 is a schematic view showing an expanded structure of another embodiment of the battery cell according to the present invention. As can be seen from fig. 4, N negative electrode tabs 11 are provided on the negative electrode sheet 10, where N is an integer greater than or equal to 3, and is a first negative electrode tab 111, a second negative electrode tab 112, a third negative electrode tab 113, and an nth negative electrode tab 11N, respectively, and a plurality of intermediate negative electrode tabs 11M are provided between the third negative electrode tab and the nth negative electrode tab 11N; during winding, the first separator 31 and the second separator 32 are wound by a predetermined length (one or two turns) by a winding machine, then the negative electrode sheet 10 is inserted between the first separator 31 and the second separator 32, and when the winding is continued to the first negative electrode tab 111 which just bypasses the negative electrode sheet 10, the positive electrode sheet 20 is inserted on the second separator 32, and at this time, the positive electrode sheet 20 cannot overlap with the first negative electrode tab (i.e., the positive electrode sheet 20 avoids the position corresponding to the first negative electrode tab 111); when the winding is continued until the second negative electrode tab 112 of the negative electrode sheet 10 is just reached, the winding machine cuts off the positive electrode sheet 20, and at this time, the positive electrode sheet 20 cannot overlap with the second negative electrode tab 112 (i.e., the positive electrode sheet 20 avoids the position corresponding to the second negative electrode tab 112); when the winding is continued until the second negative electrode tab 112 just bypasses the negative electrode tab 10, the positive electrode tab 20 is inserted into the second diaphragm 32 again, and at this time, the positive electrode tab 20 cannot overlap with the second negative electrode tab 112; continuing to wind until the third negative electrode tab 113 of the negative electrode sheet 10 is just reached, cutting off the positive electrode sheet 20 by the winding machine, repeating winding until the total length of the negative electrode sheet designed by the battery is reached, cutting off the positive electrode sheet 20 when the last negative electrode tab (namely the Nth negative electrode tab 11N) of the negative electrode sheet 10 is reached, wherein the positive electrode sheet 20 cannot be overlapped with the last negative electrode tab; continuing winding until the last negative electrode lug is completely wound, and cutting off the negative electrode piece 10; intermittently wrapping the first membrane 31 or/and the second membrane 32 for more than one circle to wrap the membrane on the surface of the battery cell, cutting off the membrane 30, and sticking the adhesive tape; manufacturing an electric core;
the manufacturing method of the battery cell can also be that after the first diaphragm and the second diaphragm are wound for a preset length by a winding machine, a negative electrode plate is inserted between the first diaphragm and the second diaphragm, when the battery cell is continuously wound to a first negative electrode tab which just bypasses the negative electrode plate, a positive electrode plate is inserted on the second diaphragm, and at the moment, the positive electrode plate cannot be overlapped with the first negative electrode tab; the positive electrode material on the positive electrode plate is a piece of positive electrode material block which is coated in advance by an intermittent coating method, a blank gap with a preset width is arranged between two adjacent positive electrode material blocks, and when a winding machine is arranged to continuously wind the positive electrode plate to just reach the second negative electrode tab of the negative electrode plate, the blank gap on the positive electrode plate is just aligned with the second negative electrode tab, so that the positive electrode material on the positive electrode plate cannot be overlapped with the second negative electrode tab; so, repeatedly winding until the total length of the negative electrode plate designed by the battery is reached, cutting off the positive electrode plate when the last negative electrode tab of the negative electrode plate arrives, wherein the positive electrode plate cannot be overlapped with the last negative electrode tab; continuing winding until the last negative electrode tab is completely wound, and cutting off the negative electrode sheet; then intermittently winding the first diaphragm or/and the second diaphragm by more than one roll, wrapping the diaphragm on the surface of the battery cell, and cutting off the diaphragm; manufacturing an electric core;
s4, folding and pressing the negative electrode tab 11 towards the direction of the center hole of the battery cell, so that the negative electrode tab 11 covers the center hole;
s5, loading the semi-finished cylindrical battery cell manufactured in the S4 into a steel shell, and enabling the negative electrode tab 11 to be abutted against the inner bottom surface of the steel shell;
s6, inserting a welding needle of an ultrasonic welder from a center hole of the positive end of the semi-finished cylindrical battery cell to enable a welding needle head of the welding needle to press the negative electrode tab on the inner bottom surface of the steel shell; starting an ultrasonic welder to weld the negative electrode lug on the inner bottom surface of the steel shell; in the embodiment, the power of the ultrasonic welder is more than or equal to 200 watts and less than or equal to 2000 watts; the vibration frequency is 40KHz or more and 410KHz or less. The length of the welding needle of the ultrasonic welder is more than or equal to 90mm and less than or equal to 200mm; the diameter of the welding needle is more than or equal to 2.5mm and less than or equal to 6mm; the end face of the free end of the welding needle head of the welding needle is provided with patterns. The patterns are raised ball points or raised grid patterns.
And S7, electrically connecting the multi-lug positive electrode 21 with a battery positive electrode cover plate, and arranging a sealing piece between the battery positive electrode cover plate and the upper end of the steel shell to form the multi-lug cylindrical lithium ion battery.
Preferably, the diameter of the center hole is selected from more than or equal to 4mm and less than or equal to 10 mm. The diameter of the center hole is proportional to the diameter of the battery, and the larger the diameter of the battery is, the larger the diameter of the center hole is.
Preferably, the diameter of the center hole can be selected between 4mm and 9mm, such as 4mm or 5mm or 6mm or 7mm or 8mm or 9mm.
The invention also provides a multi-lug cylindrical lithium ion battery, which is manufactured by the manufacturing method of the multi-lug cylindrical lithium ion battery.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (8)
1. The manufacturing method of the multi-lug cylindrical lithium ion battery cell is characterized by comprising the following steps of:
s1, arranging N anode tabs which are separated by a preset distance on an anode sheet, wherein N is an integer greater than or equal to 3;
s2, arranging a plurality of positive electrode lugs on the positive electrode plate;
s3, separating and winding the positive plate and the negative plate by using a diaphragm, and freeing the positive plate from the position corresponding to the negative electrode lug of the negative plate to manufacture the battery cell.
2. The manufacturing method of the multi-lug cylindrical lithium ion battery is characterized by comprising the following steps of:
s1, arranging N anode tabs which are separated by a preset distance on an anode sheet, wherein N is an integer greater than or equal to 3;
s2, arranging a plurality of positive electrode lugs on the positive electrode plate;
s3, separating and winding the positive plate and the negative plate by using a diaphragm, so that the positive plate is free of a position corresponding to a negative electrode lug of the negative plate, and a battery cell is manufactured;
s4, folding and pressing the negative electrode tab towards the direction of the center hole of the battery cell, so that the negative electrode tab covers the center hole;
s5, loading the semi-finished cylindrical battery cell manufactured in the S4 into a steel shell, and enabling the negative electrode lug to be abutted against the inner bottom surface of the steel shell;
s6, inserting a welding needle of an ultrasonic welder from a center hole of the positive end of the semi-finished cylindrical battery cell to enable a welding needle head of the welding needle to press the negative electrode tab on the inner bottom surface of the steel shell; starting an ultrasonic welder to weld the negative electrode lug on the inner bottom surface of the steel shell;
and S7, electrically connecting the multi-lug positive electrode with a battery positive electrode cover plate, and arranging a sealing piece between the battery positive electrode cover plate and the upper end of the steel shell to form the multi-lug cylindrical lithium ion battery.
3. The method of manufacturing a multi-polar cylindrical lithium ion battery according to claim 2, wherein the diameter of the center hole is selected from 4mm or more and 10mm or less.
4. The method of manufacturing a multi-polar cylindrical lithium ion battery according to claim 3, wherein the diameter of the center hole is selected from 5mm to 9mm.
5. The method for manufacturing a multi-lug cylindrical lithium ion battery according to claim 2, 3 or 4, wherein the power of the ultrasonic welder is 200 watts or more and 2000 watts or less; the vibration frequency is 40KHz or more and 410KHz or less.
6. The method of manufacturing a multi-pole cylindrical lithium ion battery according to claim 5, wherein the length of the welding needle of the ultrasonic welder is more than or equal to 90mm and less than or equal to 200mm; the diameter of the welding needle is more than or equal to 2.5mm and less than or equal to 9mm; the end face of the free end of the welding needle head of the welding needle is provided with patterns.
7. The method of manufacturing a multi-polar cylindrical lithium ion battery according to claim 6, wherein the pattern is a raised ball point or a raised grid pattern.
8. A multipolar ear cylinder lithium ion battery, characterized by: is manufactured by the manufacturing method of the multi-lug cylindrical lithium ion battery according to any one of claims 2 to 7.
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