CN116417689A - Manufacturing method of multi-pole cylindrical lithium ion battery and lithium ion battery - Google Patents
Manufacturing method of multi-pole cylindrical lithium ion battery and lithium ion battery Download PDFInfo
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- CN116417689A CN116417689A CN202310544339.7A CN202310544339A CN116417689A CN 116417689 A CN116417689 A CN 116417689A CN 202310544339 A CN202310544339 A CN 202310544339A CN 116417689 A CN116417689 A CN 116417689A
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- Prior art keywords
- lug
- multipolar
- lithium ion
- negative electrode
- ion battery
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 230000005405 multipole Effects 0.000 title claims abstract description 7
- 238000003466 welding Methods 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 11
- 239000002893 slag Substances 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 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
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
-
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
-
- 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
-
- 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)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
A manufacturing method of a multi-pole ear cylindrical lithium ion battery and the lithium ion battery thereof, wherein the method comprises the steps of separating a positive pole piece and a negative pole piece by a diaphragm and winding the positive pole piece and the negative pole piece into a cylindrical battery core; cutting a group of negative electrode multipolar lugs from the negative electrode of the tab blank in a die cutting mode; folding and pressing the negative electrode multipolar lug towards the direction of the circle center hole, so that the negative electrode multipolar lug covers the circle center hole; loading the semi-finished cylindrical battery cell into a steel shell; and inserting a welding pin of an ultrasonic welder, and welding the negative electrode multipolar lug on the inner bottom surface of the steel shell. The invention has the advantages that the cathode multipolar lugs can be completely overlapped together, no flexible flat is needed, and no current collecting sheet is needed.
Description
Technical Field
The invention relates to the field of battery manufacturing, in particular to a manufacturing method of a multi-lug cylindrical lithium ion battery and the lithium ion battery.
Background
The current cylindrical lithium ion battery has fewer lugs to cause battery heating, the capacity of the battery is increased, the diameter of the battery is increased, and the heating is more serious. 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 multipolar lug in the cylindrical lithium ion battery is mature, and the general manufacturing method of the negative electrode multipolar lug is as follows: firstly, welding a plurality of lugs on one side of a negative electrode plate, winding the lugs into a battery core in a matched manner with a positive electrode plate and a diaphragm, then flexibly leveling the negative electrode multipolar lugs, then welding a current collecting plate on the flexibly leveled negative electrode multipolar lugs by a laser welding method, loading the battery core welded with the current collecting plate into a steel shell, and welding the current collecting plate with the inner bottom surface of the steel shell by adopting a spot welding mode. The method for manufacturing the anode multipolar lug cylindrical lithium battery has the following problems that after a plurality of anode lugs are wound into a battery core, the anode lugs cannot be fully overlapped together, so that the soft leveling of the anode multipolar lugs is affected, and in addition, slag is easy to generate in the soft leveling process, so that the battery is short-circuited, and the qualification rate of the battery is reduced; secondly, the welding between the anode multipolar lug and the current collecting piece and the welding between the current collecting piece and the inner bottom surface of the steel shell are all possible to be subjected to cold welding, the internal resistance of the battery can be increased due to cold welding, the battery is easy to heat, and the whole battery can be scrapped when serious; thirdly, the current collecting plate occupies the internal space of the battery, so that the capacity of the battery with the same volume and size can be reduced; fourthly, the manufacturing process is complicated, a plurality of lugs are required to be welded, the battery cell is wound, the multipolar lugs are flexible and flat, the current collecting piece is welded on the negative multipolar lugs, and the current collecting piece is welded on the inner bottom surface of the steel shell after the shell is assembled.
Disclosure of Invention
The invention aims to provide a manufacturing method of a multi-lug cylindrical lithium ion battery with fully overlapped negative electrode multi-lugs, no need of flexible flat and no need of a current collecting piece.
Another object of the invention is: a lithium ion battery manufactured by the method is provided.
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 comprises the following steps:
s1, separating a positive pole piece and a negative pole piece by using a diaphragm, and winding the positive pole piece and the negative pole piece into a cylindrical battery cell, wherein the positive pole end is a multipolar lug positive pole, and the negative pole end is a lug blank negative pole;
s2, cutting the lug blank negative electrode into a group of negative electrode multipolar lugs in a die cutting mode, wherein all the negative electrode multipolar lugs form a neat multilayer laminated structure from the center hole to the outermost layer;
s3, folding and pressing the negative electrode multipolar lug towards the direction of the circle center hole, so that the negative electrode multipolar lug covers the circle center hole;
s4, loading the semi-finished cylindrical battery cell manufactured in the S3 into a steel shell, and enabling the negative electrode multipolar lug to be propped against the inner bottom surface of the steel shell;
s5, inserting a welding needle of an ultrasonic welder from a center hole of the positive end of the semi-finished cylindrical battery cell, so that a welding needle head of the welding needle presses the negative electrode multipolar lug on the inner bottom surface of the steel shell; starting an ultrasonic welder to weld the negative electrode multipolar lug on the inner bottom surface of the steel shell;
and S6, 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 to the invention, the die cutting mode adopts a longitudinal blade to cut the cathode of the tab blank into a left part, a middle part and a right part along the axial direction of the battery cell, wherein the width of the middle part is larger than or equal to the diameter of a center hole, and the middle part is opposite to the center hole; cutting off left and right parts along the radial direction of the battery cell by adopting a transverse blade; and a transverse blade is adopted to cut off one half of the middle part along the radial direction of the battery cell, and only the other half of the middle part is reserved.
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 between 5mm and 9mm.
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.
The invention also provides a multipolar ear cylindrical lithium ion battery, which comprises a steel shell, an electric core, a battery anode cover plate and a sealing piece; the battery cell is provided with a negative electrode multipolar lug which is directly welded on the inner bottom surface of the steel shell by ultrasonic waves; the battery cell is provided with a multipolar lug positive electrode, the multipolar lug positive electrode is electrically connected with a battery positive electrode cover plate, and the sealing piece is arranged between the battery positive electrode cover plate and the upper end of the steel shell.
As an improvement to the invention, the seal is an annular seal.
The pole piece is wound to form the pole lug blank negative electrode, and then the negative electrode multipolar lug is manufactured in a die cutting mode, so that the negative electrode multipolar lug can be ensured to be completely overlapped; the folded negative electrode multipolar lugs are directly welded on the inner bottom of the steel shell by adopting ultrasonic waves, so that a soft leveling process is not needed, and slag generated in the soft leveling process is avoided; the invention omits the current collecting piece, and avoids the problem of cold joint between the cathode multipolar lug and the current collecting sign. Therefore, the invention has the advantages that the cathode multipolar lugs can be completely overlapped together, no flexible flat is needed, and no current collecting sheet is needed.
Drawings
FIG. 1 is a block diagram of one embodiment of the method of the present invention.
Fig. 2 is a schematic diagram of a stacked structure of a positive electrode sheet, a separator and a negative electrode sheet according to the method of the present invention.
Fig. 3 is a schematic view of the structure of fig. 2 after winding.
Fig. 4 is a schematic view of the structure of the full tab of fig. 3 after being cut into multiple tabs.
Fig. 5 is a partially cross-sectional structural schematic view of a battery in 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. 1-4, fig. 1-4 disclose a method for manufacturing a multi-pole cylindrical lithium ion battery, comprising the following steps:
s1, separating a positive pole piece 10 and a negative pole piece 20 by a diaphragm 30, and winding into a cylindrical battery cell 2, wherein the positive pole end is a multi-pole lug positive pole 101, and the negative pole end is a pole lug blank negative pole 201;
s2, cutting the tab blank negative electrode 201 into a group of negative electrode multipolar lugs 21 in a die cutting mode, wherein all the negative electrode multipolar lugs 21 form a neat multilayer laminated structure from a circle center hole 23 (see fig. 5, the same description below) to the outermost layer; specifically, the die cutting mode in this embodiment adopts a longitudinal blade to reciprocate along the axial direction of the battery core, and cuts the tab blank cathode 201 into three parts, namely a left part, a middle part and a right part, wherein the width of the middle part is greater than or equal to the diameter of the center hole, and the middle part is opposite to the center hole; a transverse blade is adopted to reciprocate along the radial direction of the battery cell to cut off the left part and the right part; and a transverse blade is adopted to reciprocate along the radial direction of the battery cell to cut off one half of the middle part, and only the other half of the middle part is reserved;
s3, folding and pressing the negative electrode multipolar lug 21 towards the direction of the circle center hole to enable the negative electrode multipolar lug to cover the circle center hole; the negative electrode multipolar lug 21 can be folded and pressed manually or mechanically towards the direction of the center hole;
s4, loading the semi-finished cylindrical battery cell manufactured in the S3 into a steel shell, and enabling the negative electrode multipolar lug to be propped against the inner bottom surface of the steel shell;
s5, inserting a welding needle of an ultrasonic welder from a center hole of the positive end of the semi-finished cylindrical battery cell, so that a welding needle head of the welding needle presses the negative electrode multipolar lug on the inner bottom surface of the steel shell; starting an ultrasonic welder to weld the negative electrode multipolar 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 S6, 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.
In the present invention, before step S3, that is, before the negative electrode multipolar lug 21 is folded, the slag preventing sheet 24 may be placed at the lower end of the center hole, and then the negative electrode multipolar lug 21 may be folded.
In the present invention, or before step S5, that is, before inserting the welding pin of the ultrasonic welder, the slag preventing piece 24 may be placed at the upper end of the center hole, then the welding pin of the ultrasonic welder is inserted, and the slag preventing piece 24 is pushed to the lower end of the center hole by the welding pin, and then the welding is performed. The slag preventing sheet 24 may be a nickel sheet or a copper sheet, and the diameter of the slag preventing sheet 24 is equal to or slightly smaller than or slightly larger than the diameter of the center hole.
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 5mm and 9mm, such as 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.
Referring to fig. 5, the present invention further provides a multi-pole cylindrical lithium ion battery, which comprises a steel shell 1, a battery core 2, a battery anode cover plate 3 and a sealing member 4; the battery cell 2 is provided with a negative electrode multipolar lug 21, and the negative electrode multipolar lug 21 is directly welded on the inner bottom surface of the steel shell 1 by ultrasonic waves; the battery cell 2 is provided with a multi-lug positive electrode 22 (broken line in fig. 5), the multi-lug positive electrode 22 is electrically connected with the battery positive electrode cover plate 3, and the sealing piece 4 is arranged between the battery positive electrode cover plate 3 and the upper end of the steel shell 1.
Preferably, the center of the battery core 2 is provided with a center hole 23, the center hole 23 is provided with a slag preventing piece 24, the slag preventing piece 24 is welded together with the negative electrode multipolar lug 21 on the inner bottom surface of the steel shell 1, and the slag preventing piece 24 in the embodiment is used for preventing the negative electrode multipolar lug 21 from generating slag and entering the center hole 23 to cause the risk of short circuit of the battery in the ultrasonic welding process. The slag preventing plate 24 may be a nickel plate or a copper plate.
Preferably, the seal 4 is an annular seal; the annular seal may be of silicone or rubber.
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 (10)
1. The manufacturing method of the multi-lug cylindrical lithium ion battery is characterized by comprising the following steps of:
s1, separating a positive pole piece and a negative pole piece by using a diaphragm, and winding the positive pole piece and the negative pole piece into a cylindrical battery cell, wherein the positive pole end is a multipolar lug positive pole, and the negative pole end is a lug blank negative pole;
s2, cutting the lug blank negative electrode into a group of negative electrode multipolar lugs in a die cutting mode, wherein all the negative electrode multipolar lugs form a neat multilayer laminated structure from the center hole to the outermost layer;
s3, folding and pressing the negative electrode multipolar lug towards the direction of the circle center hole, so that the negative electrode multipolar lug covers the circle center hole;
s4, loading the semi-finished cylindrical battery cell manufactured in the S3 into a steel shell, and enabling the negative electrode multipolar lug to be propped against the inner bottom surface of the steel shell;
s5, inserting a welding needle of an ultrasonic welder from a center hole of the positive end of the semi-finished cylindrical battery cell, so that a welding needle head of the welding needle presses the negative electrode multipolar lug on the inner bottom surface of the steel shell; starting an ultrasonic welder to weld the negative electrode multipolar lug on the inner bottom surface of the steel shell;
and S6, 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.
2. The method for manufacturing the multi-lug cylindrical lithium ion battery according to claim 1, wherein the die cutting mode is to cut the cathode of the tab blank into a left part, a middle part and a right part along the axial direction of the battery core by adopting a longitudinal blade, wherein the width of the middle part is larger than or equal to the diameter of a center hole, and the middle part is opposite to the center hole; cutting off left and right parts along the radial direction of the battery cell by adopting a transverse blade; and a transverse blade is adopted to cut off one half of the middle part along the radial direction of the battery cell, and only the other half of the middle part is reserved.
3. The method for manufacturing a multi-lug cylindrical lithium ion battery according to claim 1 or 2, wherein the diameter of the center hole is selected from 4mm to 10 mm.
4. The method of manufacturing a multi-pole 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 the multi-lug cylindrical lithium ion battery according to claim 1 or 2, wherein 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.
6. The method for manufacturing the multi-lug 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 claim 6, wherein the pattern is a raised ball point or a raised grid pattern.
8. A multi-lug cylindrical lithium ion battery is characterized in that the battery is manufactured by the manufacturing method of the multi-lug cylindrical lithium ion battery as claimed in any one of claims 1-7.
9. The multi-lug cylindrical lithium ion battery is characterized by comprising a steel shell (1), an electric core (2), a battery anode cover plate (3) and a sealing piece (4); the battery cell (2) is provided with a negative electrode multipolar lug (21), and the negative electrode multipolar lug (21) is directly welded on the inner bottom surface of the steel shell (1) by ultrasonic waves; the battery cell (2) is provided with a multi-lug positive electrode (22), the multi-lug positive electrode (22) is electrically connected with the battery positive electrode cover plate (3), and the sealing piece (4) is arranged between the battery positive electrode cover plate (3) and the upper end of the steel shell (1).
10. The multi-polar cylindrical lithium ion battery according to claim 9, wherein the sealing member (4) is an annular sealing member.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310544339.7A CN116417689B (en) | 2023-05-16 | 2023-05-16 | Manufacturing method of multi-pole cylindrical lithium ion battery and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310544339.7A CN116417689B (en) | 2023-05-16 | 2023-05-16 | Manufacturing method of multi-pole cylindrical lithium ion battery and lithium ion battery |
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| CN116417689B CN116417689B (en) | 2023-11-03 |
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| CN113809482A (en) * | 2021-09-15 | 2021-12-17 | 珠海冠宇电池股份有限公司 | Battery and method for producing battery |
| CN217848011U (en) * | 2022-03-25 | 2022-11-18 | 东莞市振华新能源科技有限公司 | Cell model capable of being repeatedly used for bottom welding self-inspection |
| CN218745481U (en) * | 2022-08-19 | 2023-03-28 | 广西宁福新能源科技有限公司 | Welding device for bottom of cylindrical lithium ion battery cell with steel shell |
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