CN114227100B - Connection method of safety structure of soft package lithium ion battery - Google Patents
Connection method of safety structure of soft package lithium ion battery Download PDFInfo
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- CN114227100B CN114227100B CN202111394297.0A CN202111394297A CN114227100B CN 114227100 B CN114227100 B CN 114227100B CN 202111394297 A CN202111394297 A CN 202111394297A CN 114227100 B CN114227100 B CN 114227100B
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- positive electrode
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- welding piece
- output end
- temperature fuse
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application discloses a connection method of a safety structure of a lithium ion battery, which comprises the following steps of cutting a positive electrode tab, and then bending the positive electrode tab to one side; the first welding piece and the second welding piece are used for attaching the positive electrode lug and the output end of the temperature fuse together, then the first welding piece is fixed, the second welding piece is used for adsorbing the output end and rotating the temperature fuse until the positive electrode lug and the output end are in a molten state; the second welding piece rotates the temperature fuse to an initial position, and stands still, the first welding piece and the second welding piece return to the initial position, and the standing still is continued until the molten state between the positive electrode tab and the output end is solidified; and returning the bent positive electrode lug to a vertical state, and finishing welding. The temperature fuse is rotated through the second welding piece, so that the output end of the temperature fuse and the positive electrode lug are melted due to heat generated by friction of the contact surface, and then the output end of the temperature fuse and the positive electrode lug are welded together, and burrs generated by laser welding are avoided.
Description
Technical Field
The application relates to the technical field of lithium ion batteries, in particular to a method for connecting a safety structure of a soft package lithium ion battery.
Background
The 3C pouch battery is widely used in various portable devices as a battery having high energy density, long service life, and environmental friendliness. However, the 3C pouch battery has a special electrochemical system, and safety performance is one of the important problems restricting the application of the lithium ion battery. Through external protection device, can solve the safety problem of lithium ion battery when abusing to a great extent.
Commercial 3C soft package battery, external TCO component (temperature fuse) plays the temperature detect switch in general, reaches the effect of specific high temperature outage promptly, can avoid danger such as circuit high temperature fire. At present, the TCO element is welded to the positive electrode lug through laser, but burrs are inevitably generated on the surface of the pole piece, so that potential safety hazards are brought to battery production.
Disclosure of Invention
In view of the problems existing in the background art, the application aims to provide a connecting method of a safety structure of a soft-package lithium ion battery, which is characterized in that a TCO element is rotated through a second welding piece, so that the output end of the TCO element and a positive electrode tab are melted due to heat generated by friction of a contact surface, the output end of the TCO element and the positive electrode tab are welded together, and the problem of burrs on the surface of the tab after welding is solved.
In order to achieve the above purpose, the present application adopts the following technical scheme:
the application provides a connection method of a safety structure of a soft package lithium ion battery, which comprises the following steps,
step 1, cutting a positive electrode tab, and then bending the positive electrode tab to one side;
step 2, attaching the positive electrode tab to the output end of a temperature fuse by a first welding piece and a second welding piece, wherein the first welding piece is fixed, the second welding piece adsorbs the output end and rotates the temperature fuse, so that the positive electrode tab and the output end are in a molten state;
step 3, the second welding piece rotates the temperature fuse to an initial position, and stands still, the first welding piece and the second welding piece return to the initial position, and the standing still is continued until the molten state between the positive electrode tab and the output end is solidified;
and 4, returning the bent positive electrode lugs to a vertical state, and finishing welding.
Specifically, the method further comprises the step of bonding the temperature fuse with the top sealing position of the battery.
Specifically, a double-sided adhesive tape or a heat-conducting adhesive tape is used for bonding the temperature fuse and the top sealing position of the battery.
Specifically, the adsorption component is a magnetic attraction.
Specifically, the rotating speed of the second welding piece is greater than 300r/s.
Specifically, the rotation time of the second welding member is 10 to 30 seconds.
Specifically, in the rotation process, the first welding piece and the second welding piece apply pressure to the positive electrode tab and the output end.
Specifically, the pressure applied by the first welding piece and the second welding piece to the positive electrode tab and the output end is greater than 1000N.
Specifically, the total standing time is 5-20 s.
Specifically, the first welding piece and the second welding piece are cylinders.
The beneficial effects of the application are as follows: the first welding piece and the second welding piece are used for contacting the temperature fuse with the cut positive electrode lug, then the second welding piece drives the temperature fuse to rotate, so that the output end of the temperature fuse and the positive electrode lug are melted due to heat generated by friction of the contact surface, meanwhile, the first welding piece and the second welding piece apply pressure to the output end of the temperature fuse and the positive electrode lug, and the output end of the temperature fuse and the positive electrode lug generate plastic deformation under the action of the pressure, so that the temperature fuse and the positive electrode lug are welded together.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the 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 a flowchart of a connection method of a safety structure of a lithium ion battery according to an embodiment of the application.
Fig. 2 is a schematic diagram illustrating a bonding method according to an embodiment of the application.
The marks in the figure: 100-temperature fuse; 110-an output; 200-battery; 210-positive electrode lugs; 220-negative electrode tab; 230-top sealing position; 310-a first weldment; 320-second weldment.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
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" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified 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; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
As shown in fig. 1 to 2, the present embodiment provides a method for connecting a safety structure of a soft pack lithium ion battery, comprising the steps of,
s1, cutting the positive electrode tab 210 short, and then bending to one side;
s2, the first welding piece 310 and the second welding piece 320 are used for attaching the positive electrode tab 210 and the output end 110 of the temperature fuse 100 together, the first welding piece 310 is fixed, the second welding piece 320 is used for adsorbing the output end 110 and rotating the temperature fuse 100, so that the positive electrode tab 210 and the temperature fuse 100 are in a molten state;
s3, the second welding piece 320 rotates the temperature fuse 100 to an initial position, and stands still, the first welding piece 310 and the second welding piece 320 return to the initial position, and the standing still is continued until the molten state between the positive electrode tab 210 and the temperature fuse 100 is solidified;
s4, returning the bent positive electrode lug 210 to a vertical state, and finishing welding.
The safety structure of the lithium ion battery 200 includes a positive electrode tab 210 of the battery 200 and a thermal fuse 100, wherein an output end 110 of the thermal fuse 100 is welded with the positive electrode tab 210, so that the thermal fuse 100 and the battery 200 form a series structure, when the battery 200 is used, the thermal fuse 100 is used as the positive electrode of the battery 200, and a negative electrode tab 220 of the battery 200 is used as the negative electrode of the battery 200.
The present embodiment further includes bonding the thermal fuse 100 to the top sealing position 230 of the battery 200, and bonding the thermal fuse 100 to the top sealing position 230 of the battery 200, so that the thermal fuse 100 is fixed to the battery 200, and the thermal fuse 100 is prevented from moving or tilting, resulting in breakage of the output terminal 110 or the positive electrode tab 210 of the fuse. The thermal fuse 100 and the top sealing portion 230 of the battery 200 are bonded by using double-sided adhesive tape or heat conductive adhesive. The double faced adhesive tape or the heat conducting adhesive between the temperature fuse 100 and the battery 200 has good heat conduction characteristics, a good heat conduction interface can be formed between the temperature fuse 100 and the battery 200, when the battery 200 is abused to generate heat, the heat of the battery 200 can be more rapidly conducted to the temperature fuse 100, the temperature difference between the temperature fuse 100 and the battery 200 is reduced, the temperature fuse 100 can cut off a circuit more timely, and the safety of the battery 200 is ensured.
In the present embodiment, the second welding member 320 attracts the output end 110 by magnetic attraction. Preferably, the second welding part 320 is provided with an electromagnetic chuck, when the second welding part 320 works, the electromagnetic chuck is electrified to adsorb the output end 110 of the temperature fuse 100, so that the temperature fuse 100 can rotate by taking the adsorption position of the electromagnetic chuck as an axis and following the second welding part 320, and meanwhile, after the work is completed, the electrifying is disconnected, the electromagnetic chuck stops adsorbing the temperature fuse 100, and the adhesive agent can be cleaned after the rotation is completed relative to the adhesive agent for adhering the temperature fuse 100 to the second welding part 320.
In the present embodiment, the rotation speed of the second weldment 320 is greater than 300r/s, and the rotation time of the second weldment 320 is 10 to 30s. When the rotation speed of the second welding piece 320 is greater than 300r/s, the contact surface between the output end 110 of the thermal fuse 100 and the positive electrode tab 210 can quickly reach a molten state, and meanwhile, the rotation time is controlled to be 10-30 s, so that the contact surface between the output end 110 of the thermal fuse 100 and the positive electrode tab 210 is ensured to be completely molten, and the contact surface between the output end 110 of the thermal fuse 100 and the positive electrode tab 210 can be prevented from being molten.
In this embodiment, during the rotation process, the first welding member 310 and the second welding member 320 apply pressure to the positive electrode tab 210 and the output terminal 110, and the pressure is greater than 1000N. By applying pressure to the thermal fuse 100 and the positive electrode tab 210, the thermal fuse 100 and the positive electrode tab 210 are plastically deformed under the action of the pressure, so that the thermal fuse 100 and the positive electrode tab 210 can be better welded together.
In this embodiment, the total time of standing is 5 to 20 seconds. The first standing time is 5s, and the first welding piece 310 and the second welding piece 320 are not removed during the first standing time, because the contact surface between the output end 110 of the thermal fuse 100 and the positive electrode tab 210 is in a molten state, if the first welding piece 310 and the second welding piece 320 are removed, the thermal fuse 100 will move down or fall under the action of gravity, so that the welding between the thermal fuse 100 and the positive electrode tab 210 will deviate or fail, and therefore the first standing time is 5s, the molten state can be partially solidified, and the situation that the thermal fuse 100 moves down or falls off will not occur when the first welding piece 310 and the second welding piece 320 are removed. The second standing is performed for 5 to 15 seconds in order to completely solidify the molten state, and the second standing time is preferably 5 to 10 seconds.
In the present embodiment, the first welding member 310 and the second welding member 320 are cylindrical. In S2, the circular surface of the first welding member 310 abuts against the positive electrode tab 210 and is fixed, the circular surface of the second welding member 320 abuts against and adsorbs the output end 110 of the thermal fuse 100, the adsorbed thermal fuse 100 is moved towards the positive electrode tab 210 and is attached to the positive electrode tab 210, and then the second welding member 320 rotates along the axial direction to further drive the thermal fuse 100 to rotate, so that friction is generated on the contact surface between the output end 110 of the thermal fuse 100 and the positive electrode tab 210 due to the rotation of the thermal fuse 100, and the contact surface between the output end 110 and the positive electrode tab 210 is in a molten state due to heat generated by friction, and meanwhile, the first welding member 310 and the second welding member 320 apply pressure to the output end 110 and the positive electrode tab 210, so that the output end 110 and the positive electrode tab 210 are deformed in a molding manner, and the connection strength between the output end 110 and the positive electrode tab 210 is further enhanced. Because the first welding piece and the second welding piece are cylindrical, the rotation can be well carried out.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the application, which are within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A method for connecting a safety structure of a soft-pack lithium ion battery, comprising the steps of:
step 1, cutting a positive electrode tab (210), and then bending to one side;
step 2, a first welding piece (310) and a second welding piece (320) are used for attaching the positive electrode tab (210) and the output end (110) of the temperature fuse (100) together, then the first welding piece (310) is fixed, the second welding piece (320) is used for adsorbing the output end (110) and rotating the temperature fuse (100) until a molten state is formed between the positive electrode tab (210) and the output end (110);
step 3, the second welding piece (320) rotates the temperature fuse (100) to an initial position, and the temperature fuse is kept stand, the first welding piece (310) and the second welding piece (320) return to the initial position, and the temperature fuse is kept stand until the molten state between the positive electrode tab (210) and the output end (110) is solidified;
and 4, reverting the bent positive electrode lug (210) to a vertical state, and finishing welding to obtain the safety structure of the soft-package lithium ion battery.
2. The method of claim 1, further comprising bonding the thermal fuse (100) to a top seal (230) of the battery (200).
3. The method of claim 2, wherein a double sided adhesive tape or a heat conductive adhesive is used to bond the thermal fuse (100) to the top seal (230) of the battery (200).
4. The method of claim 1, wherein the second welding member (320) adsorbs the output terminal (110) by magnetic attraction.
5. The method of claim 1, wherein the second welding member (320) has a rotational speed greater than 300r/s.
6. The method of claim 5, wherein the second welding member (320) rotates for 10 to 30 seconds.
7. The method of claim 1, wherein the first and second welding members (310, 320) apply pressure to the positive tab (210) and the output terminal (110) during rotation.
8. The method of claim 7, wherein the first welding member (310) and the second welding member (320) exert a pressure on the positive electrode tab (210) and the output terminal (110) of greater than 1000N.
9. The method for connecting a safety structure of a soft pack lithium ion battery according to claim 1, wherein the total time of standing is 5 to 20 seconds.
10. The method of claim 1, wherein the first welding member (310) and the second welding member (320) are cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111394297.0A CN114227100B (en) | 2021-11-23 | 2021-11-23 | Connection method of safety structure of soft package lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111394297.0A CN114227100B (en) | 2021-11-23 | 2021-11-23 | Connection method of safety structure of soft package lithium ion battery |
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| CN114227100A CN114227100A (en) | 2022-03-25 |
| CN114227100B true CN114227100B (en) | 2023-09-05 |
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| CN114227100A (en) | 2022-03-25 |
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