CN114227100A - Connection method of safety structure of lithium ion battery - Google Patents
Connection method of safety structure of lithium ion battery Download PDFInfo
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- CN114227100A CN114227100A CN202111394297.0A CN202111394297A CN114227100A CN 114227100 A CN114227100 A CN 114227100A CN 202111394297 A CN202111394297 A CN 202111394297A CN 114227100 A CN114227100 A CN 114227100A
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- output end
- positive electrode
- welding
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- 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
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
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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
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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 invention discloses a method for connecting a safety structure of a lithium ion battery, which comprises the following steps of cutting a positive electrode tab short, and then bending the positive electrode tab to one side; the first welding part and the second welding part attach the positive electrode lug and the output end of the temperature fuse together, then the first welding part is fixed, the second welding part adsorbs the output end, and the temperature fuse is rotated to a state of fusion between the positive electrode lug and the output end; the second welding part rotates the temperature fuse to an initial position, stands, returns the first welding part and the second welding part to the initial position, and continues to stand until the molten state between the positive electrode lug and the output end is solidified; and (5) restoring the bent positive electrode lug to be in a vertical state to finish welding. The temperature fuse is rotated through the second welding part, so that the output end of the temperature fuse is melted with the heat generated by the friction of the contact surface of the anode tab, and the output end of the temperature fuse is welded with the anode tab together, and burrs generated by laser welding are avoided.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a connection method of a safety structure of a lithium ion battery.
Background
The 3C pouch battery is widely used in various portable devices as an environmentally friendly battery with high energy density and long service life. However, the 3C soft package battery has a special electrochemical system, and the safety performance is one of the important problems restricting the application of the lithium ion battery. The safety problem of the lithium ion battery in abuse can be solved to a great extent by externally connecting the protection device.
Commercial 3C laminate polymer battery, external TCO component (temperature fuse) usually play temperature detect switch, reach the effect of specific high temperature outage promptly, can avoid danger such as circuit high temperature fire. At present, the TCO element is generally welded to the positive electrode lug through laser, but burrs are inevitably generated on the surface of the electrode piece, so that potential safety hazards are brought to the production of the battery.
Disclosure of Invention
In view of the problems in the background art, an object of the present invention is to provide a method for connecting a safety structure of a lithium ion battery, in which a TCO element is rotated by a second welding member, so that an output end of the TCO element and a positive electrode tab are melted by heat generated by friction of a contact surface, and the output end of the TCO element and the positive electrode tab are welded together, thereby solving the problem of burrs on the surface of the tab after welding.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for connecting a safety structure of a lithium ion battery, which comprises the following steps,
step 1, cutting a positive electrode tab short, and then bending the positive electrode tab to one side;
step 2, the first welding part and the second welding part attach the positive electrode lug and the output end of the temperature fuse together, then the first welding part is fixed, the second welding part adsorbs the output end, and the temperature fuse rotates to enable the positive electrode lug and the output end to be in a molten state;
step 3, the second welding part rotates the temperature fuse to an initial position, stands, returns the first welding part and the second welding part to the initial position, and continues to stand until the molten state between the positive electrode lug and the output end is solidified;
and 4, restoring the bent positive electrode lug to be in a vertical state to finish welding.
Specifically, the method further comprises the step of bonding the temperature fuse with a 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 magnetic.
Specifically, the rotating speed of the second welding piece is larger than 300 r/s.
Specifically, the rotation time of the second welding part is 10-30 s.
Specifically, in the rotating 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 lug 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 invention has the following beneficial effects: the temperature fuse is contacted with the shortened positive pole lug through the first welding part and the second welding part, then the second welding part drives the temperature fuse to rotate, the output end of the temperature fuse and the positive pole lug are fused due to heat generated by friction of a contact surface, meanwhile, the first welding part and the second welding part apply pressure to the output end of the temperature fuse and the positive pole lug, the output end of the temperature fuse and the positive pole lug generate plastic deformation under the action of pressure, and therefore the temperature fuse and the positive pole lug are welded together.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a connection method of a safety structure of a lithium ion battery according to an embodiment of the present invention.
Fig. 2 is a schematic welding diagram of a connection method according to an embodiment of the invention.
The labels in the figure are: 100-temperature fuse; 110-an output terminal; 200-a battery; 210-positive pole tab; 220-negative pole tab; 230-top sealing position; 310-a first weldment; 320-second weldment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It will be understood that when an element is referred to as being "secured to" 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 as used herein are for illustrative purposes only and do not denote a unique embodiment.
As shown in fig. 1 to 2, the present embodiment provides a method for connecting a safety structure of a lithium ion battery, including the steps of,
s1, cutting the positive electrode tab 210 short, and then bending the positive electrode tab to one side;
s2, the first welding part 310 and the second welding part 320 stick the positive electrode tab 210 to the output end 110 of the temperature fuse 100, the first welding part 310 is fixed, the second welding part 320 adsorbs the output end 110, and rotates the temperature fuse 100, so that the positive electrode tab 210 and the temperature fuse 100 are molten;
s3, the second welding piece 320 rotates the temperature fuse 100 to an initial position, the temperature fuse stands, the first welding piece 310 and the second welding piece 320 return to the initial position, and the temperature fuse 100 continues to stand until the molten state between the positive electrode lug 210 and the temperature fuse 100 is solidified;
and S4, restoring the bent positive electrode lug 210 to be in a vertical state, and completing welding.
The safety structure of the lithium ion battery 200 includes a positive electrode tab 210 of the battery 200 and the temperature fuse 100, wherein the output end 110 of the temperature fuse 100 is welded to the positive electrode tab 210, so that the temperature fuse 100 and the battery 200 form a series structure, when the battery 200 is used, the temperature fuse 100 is used as the positive electrode of the battery 200, and the negative electrode tab 220 of the battery 200 itself is used as the negative electrode of the battery 200.
The present embodiment further includes bonding the thermal fuse 100 to the top seal 230 of the battery 200, and bonding the thermal fuse 100 to the top seal 230 of the battery 200, so as to fix the thermal fuse 100 to the battery 200, and prevent the thermal fuse 100 from moving or tilting, which may cause the output end 110 of the fuse or the positive electrode tab 210 to break. In which a double-sided tape or a thermal conductive adhesive is used to bond the thermal fuse 100 and the top sealing position 230 of the battery 200. The double-sided adhesive or the heat-conducting adhesive between the thermal fuse 100 and the battery 200 has good heat conduction characteristics, a good heat conduction interface can be formed between the thermal fuse 100 and the battery 200, when the battery 200 is abused to generate heat, the heat of the battery 200 can be more quickly conducted to the thermal fuse 100, the temperature difference between the thermal fuse 100 and the battery 200 is reduced, the circuit can be cut off more timely by the thermal fuse 100, and the safety of the battery 200 is ensured.
In the present embodiment, the second welding member 320 attracts the output terminal 110 by magnetic attraction. Preferably, second welding piece 320 is provided with electromagnet, at second welding piece 320 during operation, electromagnet circular telegram, adsorb output 110 to temperature fuse 100, make temperature fuse 100 can use electromagnet to adsorb the department as the axle, follow second welding piece 320 and rotate, after work is accomplished simultaneously, the disconnection circular telegram, electromagnet stops the absorption to temperature fuse 100, it is visible paste second welding piece 320 for pasting temperature fuse 100 with the stickness agent, still must wash the stickness agent after the rotation, use magnetism to inhale and to simplify the adsorption process, and the efficiency is improved.
In the present embodiment, the rotation speed of the second welding member 320 is greater than 300r/s, and the rotation time of the second welding member 320 is 10-30 s. When the rotation speed of the second welding part 320 is greater than 300r/s, the contact surface of the output end 110 of the temperature fuse 100 and the positive electrode tab 210 can rapidly reach a molten state, and the rotation time is controlled to be 10-30 s, so that the contact surface of the output end 110 of the temperature fuse 100 and the positive electrode tab 210 is completely molten, and the contact surface of the output end 110 of the temperature fuse 100 and the positive electrode tab 210 can be prevented from being melted through.
In the present embodiment, during the rotation process, the first welding member 310 and the second welding member 320 apply a pressure to the positive electrode tab 210 and the output end 110, and the pressure is greater than 1000N. By applying pressure to the temperature fuse 100 and the positive electrode tab 210, the temperature fuse 100 and the positive electrode tab 210 are plastically deformed under the action of the pressure, and the temperature fuse 100 and the positive electrode tab 210 can be better welded together.
In the present embodiment, the total time of the standing is 5 to 20 seconds. The first standing time is 5s, the first welding part 310 and the second welding part 320 are not removed during the first standing, because the contact surface between the output end 110 of the thermal fuse 100 and the positive electrode tab 210 is molten, if the first welding part 310 and the second welding part 320 are removed, the thermal fuse 100 moves down or falls off under the action of gravity, which causes the welding of the thermal fuse 100 and the positive electrode tab 210 to shift or fail, and therefore, the first standing time is 5s, the molten state can be partially solidified, and when the first welding part 310 and the second welding part 320 are removed, the thermal fuse 100 does not move down or fall off. The second standing is carried out for 5-15 s to completely solidify the molten state, and the second standing time is preferably 5-10 s.
In the present embodiment, the first welding part 310 and the second welding part 320 are cylinders. 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 toward the positive electrode tab 210, the fuse is attached to the positive electrode tab 210, and thereafter, the second welding member 320 is rotated in the axial direction, thereby driving the temperature fuse 100 to rotate, the contact surface between the output end 110 of the temperature fuse 100 and the positive electrode tab 210 generates friction due to the rotation of the temperature fuse 100, since the friction generates heat so that the contact surface of the output end 110 and the positive electrode tab 210 is in a molten state, meanwhile, the first welding part 310 and the second welding part 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 subjected to plastic deformation, and the connection strength between the output end 110 and the positive electrode tab 210 is further enhanced. Because first welding spare and second welding spare are the cylinder, can finely rotate.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for connecting a safety structure of a lithium ion battery is characterized by comprising the following steps,
step 1, cutting a positive electrode tab (210) into short pieces, and then bending the positive electrode tab to one side;
step 2, the positive pole lug (210) and the output end (110) of the temperature fuse (100) are attached together through a first welding piece (310) and a second welding piece (320), then the first welding piece (310) is fixed, the second welding piece (320) adsorbs the output end (110), and the temperature fuse (100) rotates to a position between the positive pole lug (210) and the output end (110) and is in a molten state;
step 3, the second welding piece (320) rotates the temperature fuse (100) to an initial position, the temperature fuse stands, the first welding piece (310) and the second welding piece (320) return to the initial position, and standing is continued until the molten state between the positive pole lug (210) and the output end (110) is solidified;
and 4, restoring the bent positive pole lug (210) to be in a vertical state to finish welding.
2. The method of claim 1, further comprising bonding the thermal fuse (100) to a capping site (230) of a battery (200).
3. The method of claim 2, wherein a double-sided tape or a thermal tape is used to bond the thermal fuse (100) to the top sealing position (230) of the battery (200).
4. The method of claim 1, wherein the second welding member (320) attracts the output end (110) by magnetic attraction.
5. The method of claim 1, wherein the second weldment (320) rotates at a speed greater than 300 r/s.
6. The method of claim 5, wherein the second welding member (320) rotates for 10-30 seconds.
7. The method of claim 1, wherein the first and second weldments (310, 320) apply pressure to the positive electrode tab (210) and the output end (110) during rotation.
8. The method of claim 7, wherein the pressure exerted by the first and second weldments (310, 320) on the positive electrode tab (210) and the output end (110) is greater than 1000N.
9. The method for connecting a safety structure of a lithium ion battery according to claim 1, wherein the total time of standing is 5 to 20 seconds.
10. The method of connecting a safety structure of a lithium ion battery according to claim 1, wherein the first weldment (310) and the second weldment (320) are cylindrical bodies.
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 true CN114227100A (en) | 2022-03-25 |
| CN114227100B CN114227100B (en) | 2023-09-05 |
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| CN114227100B (en) | 2023-09-05 |
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