CN116031466B - Method for manufacturing cylindrical battery - Google Patents
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- CN116031466B CN116031466B CN202310328015.XA CN202310328015A CN116031466B CN 116031466 B CN116031466 B CN 116031466B CN 202310328015 A CN202310328015 A CN 202310328015A CN 116031466 B CN116031466 B CN 116031466B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application belongs to the technical field of new energy batteries, and particularly relates to a manufacturing method of a cylindrical battery. The cylindrical battery comprises an electric core monomer and a current collector, one end of the cylindrical battery extends to form a monopole lug which surrounds a circle, and one side of the current collector is provided with a connecting part. The manufacturing method of the cylindrical battery comprises the following steps: placing the connecting part of the current collector towards the monopole tab, and enabling the connecting part to be in contact with the monopole tab; welding and fixing the monopole lug and the connecting part; the monopole lugs are folded and bent inwards along the radial direction; or, gathering and bending the connecting portion radially inward; or, the monopole tab and the connection portion are folded and bent inward in the radial direction. After the battery cell monomer is assembled into the metal shell, the battery cell monomer is welded and fixed in a hard contact mode between the electrode lugs and the current collector and between the current collector and the electrode post or the cover plate, so that the battery can be broken and disconnected between the electrode lugs and the current collector and between the current collector and the electrode post or the cover plate, and finally the battery can be broken and damaged.
Description
Technical Field
The application belongs to the technical field of new energy batteries, and particularly relates to a manufacturing method of a cylindrical battery.
Background
With the continuous development of new energy automobiles, the market share of the new energy automobiles is continuously expanding. Compared with the traditional fuel automobile, the new energy automobile must catch up with and even surpass the traditional fuel automobile in the aspects of environmental adaptability, battery service life, endurance mileage and the like in order to further improve the market competitiveness. At present, the new energy automobile is particularly required to be further improved and perfected in terms of service life and endurance mileage of a battery.
Lithium batteries are a type of battery using a non-hydrolytic electrolyte solution because lithium metal or lithium alloy is a positive/negative electrode material. The cylindrical battery is a common lithium battery, has the advantages of small volume, long service life, low self-discharge rate, no memory effect, green environmental protection and the like, and is widely applied to power supplies of electronic equipment, medical equipment, new energy power supplies, mobile power storage power supplies and the like.
In the prior art, a cylindrical battery is welded through a full tab and a current collector, and then the current collector is welded with a pole or a cover plate, so that current conduction and charge and discharge are realized. After the battery cell unit is assembled into the metal shell, no displacement gap exists between the electrode lug and the current collector and between the current collector and the electrode post or the cover plate, namely, the electrode lug and the current collector and between the current collector and the electrode post or the cover plate are welded and fixed in a hard contact mode. However, in the running process of the new energy automobile, the automobile body continuously jolts and vibrates along with the road surface, so that the cylindrical battery continuously jolts and vibrates, and the cylindrical battery is enabled to be pulled and broken between the lug and the current collector and between the current collector and the pole or the cover plate, and finally the battery is broken and damaged.
Disclosure of Invention
The purpose of this application is to provide a manufacturing approach of cylinder battery, aims at solving the electric core monomer and is assembled into the metal casing after, all is the hard contact welded fastening between utmost point ear and the electric current collector, between electric current collector and utmost point post or the apron, leads to taking place to draw between utmost point ear and the electric current collector, between electric current collector and utmost point post or the apron and split, break off, finally lead to battery trouble, damage's problem.
In order to achieve the above purpose, the technical scheme adopted in the application is as follows: a manufacturing method of a cylindrical battery comprises a battery cell monomer and a current collector, wherein one end of the cylindrical battery extends to form a single-pole lug which surrounds a circle, one side of the current collector is provided with a connecting part,
the manufacturing method of the cylindrical battery comprises the following steps:
placing the connecting part of the current collector towards the monopole tab, and enabling the connecting part to be in contact with the monopole tab;
welding and fixing the monopole lug and the connecting part;
the monopole lugs are folded and bent inwards along the radial direction; or, gathering and bending the connecting portion radially inward; or, the monopole tab and the connection portion are folded and bent inward in the radial direction.
By applying the manufacturing method provided by the embodiment of the application to manufacture the cylindrical battery, the monopole tab and the connecting part are welded and fixed, so that the current collector and the monopole tab realize good electric conduction performance, the monopole tab and the connecting part are folded inwards along the radial direction and bent, the current collector and the battery cell have elastic expansion performance, and in the manufactured and assembled cylindrical battery, the battery cell is assembled into the shell in a soft assembly mode. Therefore, in the running process of the new energy automobile, even if the cylindrical battery vibrates along with the running jolt and vibration, at the moment, the monopole tab or the connecting part is folded and bent, or the monopole tab and the connecting part are folded and bent, so that the battery cell can float in the shell in a self-adaptive manner, the cylindrical battery which is better protected and cannot be pulled apart and disconnected between the monopole tab and the connecting part is protected, and the service life of the cylindrical battery is prolonged.
In one embodiment, before performing the step of "placing the connection portion of the current collector toward the monopolar tab", the manufacturing method of the cylindrical battery further includes the steps of: expanding the monopole lug to enlarge an accommodating space surrounded by the monopole lug; when the step of placing the connection portion of the current collector toward the monopolar tab is performed, the connection portion of the current collector is placed into the receiving space.
In one embodiment, before performing the step of "placing the connection portion of the current collector toward the monopolar tab", the manufacturing method of the cylindrical battery further includes the steps of: gathering the monopole tabs to reduce the outer diameter of the end surrounded by the monopole tabs; when the step of placing the connection portion of the current collector toward the monopolar tab is performed, an end portion surrounded by the monopolar tab is placed into a space surrounded by the connection portion.
In one embodiment, after the performing of the finishing step of "placing the connection portion of the current collector toward the monopolar tab", and before the performing of the step of "welding and fixing the monopolar tab and the connection portion", the manufacturing method of the cylindrical battery further includes the steps of: and the current collector is rotationally adjusted around the axis of the battery cell monomer so that the connecting parts are in one-to-one corresponding contact with the monopole lugs.
In one embodiment, the outer diameter r of the circle formed by the connection part around is smaller than or equal to the inner diameter of the circle formed by the monopole tab around.
In one embodiment, the length L of the connection portion in the axial direction of the cell unit is less than or equal to the length S of the monopolar tab from the end of the cell unit to the end of the monopolar tab.
In one embodiment, the monopole tab and the connection portion are ultrasonically welded while the step of welding and fixing the monopole tab and the connection portion is performed.
In one embodiment, before performing the step of "placing the connection portion of the current collector toward the monopolar tab", the manufacturing method of the cylindrical battery further includes the steps of: and blanking the metal sheet to form the current collector.
In one embodiment, the cylindrical battery further comprises a housing and an electrode end cap; the monopole tab is folded and bent inward in the radial direction after the completion of the step; or, gathering and bending the connecting portion radially inward; or after the monopole tab and the connecting portion are folded and bent inward in the radial direction, the manufacturing method of the cylindrical battery further includes the steps of: placing the cell unit into a shell; and covering the electrode end cover at the opening end of the shell, and abutting one side of the current collector, which is away from the connecting part, against the electrode end cover to electrically conduct the current collector and the electrode end cover.
In one embodiment, after the performing the completing step of "capping the electrode end cap to the open end of the case and the current collector is abutted against the electrode end cap on the side facing away from the connection part", the manufacturing method of the cylindrical battery further includes the steps of: and welding and fixing the electrode end cover and the current collector.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an exploded schematic view of a cell unit and a current collector according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a connection portion of a single-pole tab and a current collector of a battery cell unit welded and fixed in the embodiment of the present application;
fig. 3 is a schematic diagram illustrating structural changes of a cell unit and a current collector in a manufacturing and assembling process according to an embodiment of the present application;
FIG. 4 is a general flow diagram of a method of manufacturing a cylindrical battery of the present application;
fig. 5 is a schematic flow chart of a first embodiment of a method for manufacturing a cylindrical battery of the present application;
fig. 6 is a second flow chart of the first embodiment of the method for manufacturing a cylindrical battery of the present application;
fig. 7 is a flow chart of a second embodiment of a method of manufacturing a cylindrical battery of the present application;
fig. 8 is a second flow chart of a second embodiment of a method for manufacturing a cylindrical battery according to the present application.
Wherein, each reference sign in the figure:
10. a cell unit; 11. a monopolar tab; 20. a current collector; 21. and a connecting part.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
As shown in fig. 1 and 2, the cylindrical battery provided in the embodiment of the present application includes a battery cell 10, a current collector 20, a case (not shown), and an electrode end cap (not shown). One end of the cylindrical battery extends to form a single pole lug 11 which surrounds a circle, and one side of the current collector 20 is provided with a connecting part 21. The connecting part 21 is connected with the monopole lug 11 to realize electric conduction, the battery cell 10 is placed in the containing cavity of the shell, the electrode end cover is covered on the opening end of the shell, and the inner side wall of the electrode end cover is propped against one side of the current collector 20, which is away from the connecting part 21, so that the electrode end cover and the current collector 20 realize electric conduction.
In the cylindrical battery of the embodiment of the present application, the current collector 20 and the electrode end cap are both made of a metal material with good conductivity, and the case is made of a material with high mechanical strength. Preferably, the current collector 20, the electrode cap and the case are all formed of a steel material, and insulation between the electrode cap and the case must be ensured when the electrode cap is capped on the open end of the case.
As shown in fig. 3, the cell unit 10 and the current collector 20 are assembled to form an integral module. Then, the integrated module formed by the cell unit 10 and the current collector 20 is assembled into a case, and then an electrode cap is capped on the open end of the case.
As shown in fig. 4, the present application provides a method for manufacturing a cylindrical battery, which includes the steps of:
step S10: placing the connection portion 21 of the current collector 20 toward the monopolar tab 11 and bringing the connection portion 21 into contact with the monopolar tab 11 (corresponding to the structure diagram shown in order 1 to order 3 in fig. 3);
step S20: the monopole tab 11 and the connecting portion 21 are welded and fixed, so that good electrical conduction performance (corresponding to the structure diagram shown by the order 4 in fig. 3) is realized between the monopole tab 11 and the connecting portion 21;
step S30: the monopole tab 11 is folded and bent inward in the radial direction; or, the connecting portion 21 is folded and bent radially inward; alternatively, the monopolar tab 11 and the connection portion 21 (corresponding to the structure shown as sequence 5 in fig. 3) are folded and bent radially inward. Therefore, the monopole tab 11 and the current collector 20 have elastic expansion performance along the axial direction of the cell unit 10. After step 30 is completed, the housing and motor end cap may be used to assemble the cell 10, thereby completing the manufacturing process of the cylindrical battery.
By applying the manufacturing method provided by the embodiment of the application to manufacture the cylindrical battery, the monopole tab 11 and the connecting part 21 are welded and fixed to enable the current collector 20 and the monopole tab 11 to achieve good electric conduction performance, the monopole tab 11 and the connecting part 21 are folded inwards along the radial direction and bent to enable the current collector 20 and the battery cell 10 to have elastic expansion performance, and in the manufactured and assembled cylindrical battery, the battery cell 10 is assembled into a shell in a soft assembly mode. Therefore, in the running process of the new energy automobile, even if the cylindrical battery vibrates along with the running jolt and vibration, at the moment, the monopole tab 11 or the connecting part 21 is folded and bent, or the monopole tab 11 and the connecting part 21 are folded and bent, so that the battery cell 10 can float in the shell in a self-adaptive manner, the cylindrical battery which is better protected and cannot be pulled apart and disconnected between the monopole tab 11 and the connecting part 21 is protected, and the service life of the cylindrical battery is prolonged.
Specifically, the manufacturing method of the cylindrical battery may be the following two specific examples.
Embodiment one:
as shown in fig. 3 and 5, the manufacturing method of the cylindrical battery according to the first embodiment includes the following steps:
step S01: expanding the monopole tab 11 to enlarge an accommodating space (corresponding to the structure diagram shown in the order 1 in fig. 3) surrounded by the monopole tab 11;
step S10: placing the connection portion 21 of the current collector 20 toward the monopolar tab 11, and bringing the connection portion 21 into contact with the monopolar tab 11; in step S10, when the "placing the connection portion 21 of the current collector 20 toward the monopolar tab 11" is performed, the connection portion 21 of the current collector 20 is placed into the accommodating space (corresponding to the structure diagram shown in order 2 in fig. 3), that is, step S11 is performed; after the connection part 21 is placed in the accommodating space, that is, the outward side wall of the connection part 21 is opposite to the inward side wall of the monopolar tab 11, and then the monopolar tab 11 is slightly gathered radially inward (corresponding to the structure diagram shown in order 3 in fig. 3), the inward side wall of the monopolar tab 11 and the outward side wall of the connection part 21 can be brought into contact;
step S20: the monopole tab 11 and the connecting portion 21 (corresponding to the structure diagram shown by the order 4 in fig. 3) are welded and fixed, so that good electrical conduction performance is realized between the monopole tab 11 and the connecting portion 21;
step S30: the monopole tab 11 is folded and bent inward in the radial direction; or, the connecting portion 21 is folded and bent radially inward; alternatively, the monopolar tab 11 and the connection portion 21 (corresponding to the structure shown as sequence 5 in fig. 3) are folded and bent radially inward. Therefore, the monopole tab 11 and the current collector 20 have elastic expansion performance along the axial direction of the cell unit 10. After step 30 is completed, the housing and motor end cap may be used to assemble the cell 10, thereby completing the manufacturing process of the cylindrical battery.
By applying the manufacturing method provided by the embodiment of the application to manufacture the cylindrical battery, the monopole tab 11 and the connecting part 21 are welded and fixed to enable the current collector 20 and the monopole tab 11 to achieve good electric conduction performance, the monopole tab 11 and the connecting part 21 are folded inwards along the radial direction and bent to enable the current collector 20 and the battery cell 10 to have elastic expansion performance, and in the manufactured and assembled cylindrical battery, the battery cell 10 is assembled into a shell in a soft assembly mode. Therefore, in the running process of the new energy automobile, even if the cylindrical battery vibrates along with the running jolt and vibration, at the moment, the monopole tab 11 or the connecting part 21 is folded and bent, or the monopole tab 11 and the connecting part 21 are folded and bent, so that the battery cell 10 can float in the shell in a self-adaptive manner, the cylindrical battery which is better protected and cannot be pulled apart and disconnected between the monopole tab 11 and the connecting part 21 is protected, and the service life of the cylindrical battery is prolonged.
After performing the "placing the connection part 21 of the current collector 20 toward the monopolar tab 11" in the completion step S10, and before performing the step S20 "welding-fixing the monopolar tab 11 and the connection part 21", the manufacturing method of the cylindrical battery further includes the steps of: the current collector 20 is rotatably adjusted around the axis of the cell unit 10 so that the connection parts 21 and the monopolar tabs 11 are in one-to-one contact. The current collector 20 is adjusted in a rotating way so that all the flexible connection pieces of the connection part 21 are in one-to-one correspondence with all the monopole lugs 11, so that the contact area between the connection part 21 and the monopole lugs 11 is maximum, and after the connection part 21 and the monopole lugs 11 are welded and fixed, the internal resistance between the connection part 21 and the monopole lugs 11 tends to be minimum, and the electric conduction performance between the current collector 20 and the monopole lugs 11 is improved.
In the first embodiment, as shown in fig. 3, the outer diameter r of the circle around which the connection portion 21 is formed is smaller than or equal to the inner diameter of the circle around which the monopolar tab 11 is formed. Preferably, the outer diameter r of the circle around which the connection part 21 is formed is smaller than the inner diameter of the circle around which the monopolar tab 11 is formed.
And, the length L of the connection portion 21 in the axial direction of the cell unit 10 is less than or equal to the length S of the monopolar tab 11 from the end of the cell unit 10 to the end of the monopolar tab 11. Preferably, the length L of the connection portion 21 in the axial direction of the cell unit 10 is smaller than the length S of the monopolar tab 11 from the end of the cell unit 10 to the end of the monopolar tab 11. Further, the length L of the connection portion 21 in the axial direction of the cell unit 10 is smaller than half the length S of the monopolar tab 11 from the end of the cell unit 10 to the end of the monopolar tab 11. In this way, when step S30 is performed, the monopole tab 11 is folded and bent inward in the radial direction, and after the monopole tab 11 is folded and bent to a certain extent, the connection portion 21 is folded and bent accordingly, so that the elastic capability of the monopole tab 11 and the connection portion 21 after bending is enhanced.
When step S20 "welding and fixing the monopolar tab 11 and the connection portion 21" is performed, the monopolar tab 11 and the connection portion 21 are ultrasonically welded. The ultrasonic welding process can greatly provide welding efficiency with respect to the soldering and electric welding process, and can ensure excellent welding quality between the monopole tab 11 and the connection portion 21.
Before performing the "placing the connection portion 21 of the current collector 20 toward the monopolar tab 11" in step S10, the manufacturing method of the cylindrical battery further includes the steps of: the metal sheet is punched to form the current collector 20. The current collector 20 is prepared by adopting a blanking process, so that the production efficiency is high, and the manufacturing cost can be greatly saved.
As shown in fig. 6, in the manufacturing method of the cylindrical battery of the first embodiment, after completing step S30″ at which the monopolar tab 11 or the connection portion 21 is folded and bent, or the monopolar tab 11 and the connection portion 21″ are folded and bent, the manufacturing method of the cylindrical battery further includes the steps of: step S41: placing the cell unit 10 into a housing; then, the electrode end cap is covered on the opening end of the case, and one side of the current collector 20 facing away from the connecting portion 21 abuts against the electrode end cap, and electrical conduction is achieved between the current collector 20 and the electrode end cap.
Further, after the execution of the "cap electrode cover to the open end of the case and the current collector 20 contacts the electrode cover on the side facing away from the connection portion 21" in the completion step S41, the manufacturing method of the cylindrical battery further includes the steps of: step S42: the electrode end cap and the current collector 20 are welded and fixed. And the electrode end cover and the opening end of the shell are welded and fixed by adopting an ultrasonic welding process.
In the process of covering the electrode end cap on the open end of the case, the electrode end cap still needs to press the current collector 20 in practice, so that the monopolar tab 11 and the connection part 21 are further bent, not only the distance between the current collector 20 and the end of the battery cell 10 is reduced, but also the electrode end cap is covered on the open end of the case.
Embodiment two:
the manufacturing method of the cylindrical battery provided in the second embodiment has the following differences from the first embodiment.
As shown in fig. 7 and 8, the manufacturing method of the cylindrical battery provided by the embodiment includes the steps of:
step S02: gathering the monopole tabs 11 to reduce the outer diameter of the end portion surrounded by the monopole tabs 11;
step S10: placing the connection portion 21 of the current collector 20 toward the monopolar tab 11, and bringing the connection portion 21 into contact with the monopolar tab 11; in step S10, when the "placing the connection portion 21 of the current collector 20 toward the monopolar tab 11" is performed, the end portion surrounded by the monopolar tab 11 is placed into the space surrounded by the connection portion 21, that is, step S12 is performed.
Step S20: welding and fixing the monopole tab 11 and the connecting portion 21;
step S30: the monopole tab 11 is folded and bent inward in the radial direction; or, the connecting portion 21 is folded and bent radially inward; or, the monopole tab 11 and the connection portion 21 are folded and bent inward in the radial direction.
By applying the manufacturing method provided by the embodiment of the application to manufacture the cylindrical battery, the monopole tab 11 and the connecting part 21 are welded and fixed to enable the current collector 20 and the monopole tab 11 to achieve good electric conduction performance, the monopole tab 11 and the connecting part 21 are folded inwards along the radial direction and bent to enable the current collector 20 and the battery cell 10 to have elastic expansion performance, and in the manufactured and assembled cylindrical battery, the battery cell 10 is assembled into a shell in a soft assembly mode. Therefore, in the running process of the new energy automobile, even if the cylindrical battery vibrates along with the running jolt and vibration, at the moment, the monopole tab 11 or the connecting part 21 is folded and bent, or the monopole tab 11 and the connecting part 21 are folded and bent, so that the battery cell 10 can float in the shell in a self-adaptive manner, the cylindrical battery which is better protected and cannot be pulled apart and disconnected between the monopole tab 11 and the connecting part 21 is protected, and the service life of the cylindrical battery is prolonged.
The manufacturing method of the second embodiment is the same as that of the first embodiment except for the above differences, and thus is not described here.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.
Claims (10)
1. The manufacturing method of the cylindrical battery comprises a battery cell monomer and a current collector, wherein one end of the cylindrical battery extends to form a single-pole lug which surrounds a circle, one side of the current collector is provided with a connecting part, and the manufacturing method is characterized in that,
the manufacturing method of the cylindrical battery comprises the following steps:
placing the connection portion of the current collector toward the monopolar tab and bringing the connection portion into contact with the monopolar tab;
the monopole tab and the connecting part are welded and fixed;
the monopole lugs are folded and bent inwards along the radial direction; or, gathering and bending the connecting portion radially inward; or, the monopole tab and the connection portion are folded and bent inward in the radial direction;
the elastic expansion performance along the axial direction of the battery cell unit is provided between the monopole tab and the current collector.
2. The method for manufacturing a cylindrical battery according to claim 1, wherein,
before performing the step of "placing the connection portion of the current collector toward the monopolar tab", the manufacturing method of the cylindrical battery further includes the steps of:
expanding the monopole tab to expand an accommodating space surrounded by the monopole tab;
when the step of placing the connection portion of the current collector toward the monopolar tab is performed, the connection portion of the current collector is placed into the receiving space.
3. The method for manufacturing a cylindrical battery according to claim 1, wherein,
before performing the step of "placing the connection portion of the current collector toward the monopolar tab", the manufacturing method of the cylindrical battery further includes the steps of:
gathering the monopole lugs to reduce the outer diameter of the end part surrounded by the monopole lugs;
when the step of placing the connection portion of the current collector toward the monopolar tab is performed, an end portion surrounded by the monopolar tab is placed in a space surrounded by the connection portion.
4. A method for manufacturing a cylindrical battery according to claim 2 or 3, wherein,
after performing the completion step of "placing the connection portion of the current collector toward the monopolar tab", and before performing the step of "welding-fixing the monopolar tab and the connection portion", the manufacturing method of the cylindrical battery further includes the steps of:
and the current collector is rotationally adjusted around the axis of the battery cell unit so that the connecting part is in one-to-one corresponding contact with the monopole tab.
5. A method for manufacturing a cylindrical battery according to claim 2 or 3, wherein,
the outer diameter r of a circle formed by surrounding the connecting part is smaller than or equal to the inner diameter of a circle formed by surrounding the monopole tab.
6. The method for manufacturing a cylindrical battery according to claim 5, wherein,
the length L of the connecting part along the axial direction of the battery cell monomer is smaller than or equal to the length S of the monopole tab from the end part of the battery cell monomer to the end part of the monopole tab.
7. The method for manufacturing a cylindrical battery according to claim 1, wherein,
and performing ultrasonic welding on the monopole tab and the connecting part when the step of welding and fixing the monopole tab and the connecting part is performed.
8. The method for manufacturing a cylindrical battery according to claim 1, wherein,
before performing the step of "placing the connection portion of the current collector toward the monopolar tab", the manufacturing method of the cylindrical battery further includes the steps of:
and blanking and forming the metal sheet into the current collector.
9. The method for manufacturing a cylindrical battery according to claim 1, wherein,
the cylindrical battery also comprises a shell and an electrode end cover;
gathering and bending the monopole tabs radially inward at the completion of the performing step; or, gathering and bending the connecting portion radially inward; or, after the monopolar tab and the connection portion "are folded and bent inward in the radial direction, the manufacturing method of the cylindrical battery further comprises the steps of:
placing the battery cell monomer into the shell;
and covering the electrode end cover at the opening end of the shell, and abutting one side of the current collector, which is away from the connecting part, against the electrode end cover to electrically conduct the current collector and the electrode end cover.
10. The method for manufacturing a cylindrical battery according to claim 9, wherein,
after performing the finishing step of covering the electrode end cap on the open end of the case, the current collector abuts against the electrode end cap on the side facing away from the connection part, the manufacturing method of the cylindrical battery further includes the steps of:
and welding and fixing the electrode end cover and the current collector.
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| CN202310328015.XA CN116031466B (en) | 2023-03-30 | 2023-03-30 | Method for manufacturing cylindrical battery |
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| CN202310328015.XA CN116031466B (en) | 2023-03-30 | 2023-03-30 | Method for manufacturing cylindrical battery |
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