CN111889858A - Resistance welding structure and welding method of lithium ion battery - Google Patents
Resistance welding structure and welding method of lithium ion battery Download PDFInfo
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- CN111889858A CN111889858A CN202010689207.XA CN202010689207A CN111889858A CN 111889858 A CN111889858 A CN 111889858A CN 202010689207 A CN202010689207 A CN 202010689207A CN 111889858 A CN111889858 A CN 111889858A
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- welding
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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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- 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)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a resistance welding structure and a welding method of a lithium ion battery, wherein the welding method comprises the following specific steps: s1, the welding power supply outputs welding voltage CH1, namely the welding voltage between two adjacent welding electrodes is CH1, and the welding time is Weld 1; s2, after welding, the welding power supply outputs welding voltage CH2, namely the welding voltage between two adjacent welding electrodes is CH2, and the welding time is Weld 2; s3, after welding, circularly executing the step S1 and the step S2 until welding is finished; the welding voltage CH1 and the welding voltage CH2 form a welding current in opposite directions at each welding point. The stable welding strength can be obtained by adjusting the voltage frequency CH1/CH2 of the power supply equipment and further changing the direction of the welding current of two adjacent welding electrodes, thereby being beneficial to wide application and having great production practice significance.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a resistance welding structure and a welding method of a lithium ion battery.
Background
The lithium ion cell is a secondary cell capable of being repeatedly charged and discharged and is composed of main components such as cathode and anode plates, a separation film, electrolyte, mechanical parts and the like. Lithium ion batteries are widely used in large and medium-sized electric devices such as portable electronic devices, electric automobiles, electric bicycles, electric tools and the like, so that the quality qualification rate of the lithium ion batteries is higher and higher. In the aspect of the problem of assembly welding of the lithium ion battery, the problems of tab insufficient welding, metal burning and the like exist in resistance welding of the battery, so that the internal resistance of the battery is increased, the performance is inconsistent, the welding reliability is poor, and the electrical performance and even the safety performance of the battery are affected.
In the prior art: the utility model CN206286704U discloses a resistance welding device for lithium ion battery, which can reliably control the position of welding point between the battery and the PCM protection board, and ensure the production quality of the battery; the invention patent CN105186046A discloses a connection mode of a multi-tab winding core and a cover plate of a lithium ion battery, which adopts a plurality of layers of flexible connecting sheets to be respectively connected with the cover plate and a bus sheet connected with the multi-tab winding core in a welding way, so as to achieve the phenomena of welding looseness and falling off caused by battery vibration and swing and enhance the conductivity of the battery. In the prior art, the welding point position is mostly controlled, and the welding looseness phenomenon is avoided.
Disclosure of Invention
The invention provides a resistance welding structure of a lithium ion battery, aiming at improving the stability of welding points by improving the phenomena of metal burning and deterioration in resistance welding.
The invention is realized in this way, a resistance welding structure of a lithium ion battery, the structure comprising:
the welding device comprises n welding electrodes and a welding power supply, wherein the n welding electrodes are electrically connected with the welding power supply, the positive and negative electric properties of two adjacent welding electrodes are opposite, and n is more than or equal to 2.
Furthermore, the welding material is a copper terminal or a Ni terminal of the battery connecting sheet or a copper terminal or a Ni terminal of the battery current collector, and the thickness of the welding material is 0.4 mm.
The invention is realized in this way, and the welding method based on the resistance welding structure of the lithium ion battery is as follows:
s1, the welding power supply outputs welding voltage CH1, namely the welding voltage between two adjacent welding electrodes is CH1, and the welding time is Weld 1;
s2, after welding, the welding power supply outputs welding voltage CH2, namely the welding voltage between two adjacent welding electrodes is CH2, and the welding time is Weld 2;
s3, after welding, circularly executing the step S1 and the step S2 until welding is finished;
the welding voltage CH1 and the welding voltage CH2 form a welding current in opposite directions at each welding point.
Further, after welding in the current period, whether the corresponding welding spot has cold joint is detected, and if the detection result is yes, the welding voltage and the welding time in the next welding period are increased.
The stable welding strength can be obtained by adjusting the voltage frequency CH1/CH2 of the power supply equipment and further changing the direction of the welding current of two adjacent welding electrodes, thereby being beneficial to wide application and having great production practice significance.
Drawings
FIG. 1 is a schematic diagram of a resistance welding configuration of 2 welding electrodes provided in accordance with an embodiment of the present invention;
FIG. 2 is a graph of welding voltage and welding time for two welding modes provided by an embodiment of the present invention;
fig. 3 is a flowchart of a welding method for a resistance welding structure of a lithium ion battery according to an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
This resistance weld structure includes:
the welding structure comprises n welding electrodes and a welding power supply, wherein the n welding electrodes are electrically connected with the welding power supply, the electrical property of two adjacent welding electrodes is opposite, n is larger than or equal to 2, fig. 1 is a schematic diagram of the resistance welding structure of the 2 welding electrodes provided by the embodiment of the invention, wherein the reference numeral 1 is a battery, the reference numeral 2 is a top cover, the reference numeral 3 is the current flow direction, the reference numeral 4 is a welding spot, the reference numeral 5 is a connecting sheet made of Ni with the thickness of 0.4mm, and the reference numeral 6 is a resistance welding electrode.
The welding material can comprise a battery connecting sheet copper-based terminal and an Ni terminal, or can be a metal material such as a battery current collector copper-based terminal and an Ni terminal, and the welding material has a thickness of less than 0.4mm and has a good welding effect. The electrode welding structure is suitable for welding square multi-tab winding battery cores, soft-package tabs, cylindrical battery top cover connecting plates and the like, burning and deterioration of metal can be avoided through the adjustable resistance welding device, the production quality of the battery is guaranteed, and the welding efficiency of the battery is obviously improved.
Fig. 3 is a flowchart of a welding method for a lithium ion battery welding structure according to an embodiment of the present invention, where the method specifically includes:
s1, the welding power supply outputs welding voltage CH1, namely the voltage between two adjacent welding electrodes is CH1, and the welding time is T1;
s2, outputting welding voltage CH2 after welding, namely the voltage between two adjacent welding electrodes is CH2, and the welding time is T2;
s3, after welding, circularly executing the step S1 and the step S2 until welding is finished;
the welding voltage CH1 and the welding voltage CH2 form a welding current in opposite directions at each welding point.
In the embodiment of the invention, after welding in the current period, whether the corresponding welding spot has cold joint is detected, and if the detection result is yes, the welding voltage and the welding time length in the next welding period are increased.
The description is made in connection with the resistance welding method of the lithium ion battery in fig. 1:
the resistance welding structure is provided with a left welding electrode structure and a right welding electrode structure, the welding power supply can adjust the size and the direction of welding voltage, the welding power supply is in a CH1 mode, the right welding electrode is positive, the left welding electrode is negative, the welding voltage is CH1, and the welding time is Weld 1; CH2 mode-the left side welding electrode is positive, the right side welding electrode is negative, the welding voltage is CH2, and the welding time is Weld 2; as shown in FIG. 2, the voltage output ranges of CH1 and CH2 are 0-15V; and the voltage can be adjusted according to different welding requirements. Slope is a compensation value of welding time Weld of 0-0.9 millisecond, Weld welding time of 0-10 millisecond, a resistance welding structure is provided with a left welding electrode structure and a right welding electrode structure, and when a connecting sheet is welded, the welding electrodes are in contact with the connecting sheet matched with a battery to carry out resistance welding. The welding current directions of the two welding electrodes can be changed by changing the voltages CH1 and CH2 of the power supply equipment, the output current intensity of the left side and the right side is adjusted, and the stable welding strength of the connecting sheet is obtained.
Example 1: welding the Ni material connecting sheet of the cylindrical battery top cover: to 18650 cylinder battery top cap connecting piece series-parallel connection welding, Ni material connecting piece thickness 0.4mm places on the battery top cap, confirms that the material surface is clean and contact well with the battery top cap.
The left and right welding electrodes are in good contact with the connecting sheet matched with the battery for resistance welding. The welding power supply is adjusted to be in a CH1 mode, the welding voltage is CH1 (generally 10V), the welding time is Weld1 (value is 6s), the current direction of the welding electrode flows out from the right welding electrode and flows into the left welding electrode through the connecting piece, after welding, if no welding cold joint exists at the right welding point, the welding voltage is adjusted to be in a CH2 mode, namely welding voltage is CH2 (generally 10V), welding time is Weld2 (taking 6s), the current direction of the welding electrode is led out from the left welding electrode, flows into the right welding electrode through the connecting sheet, if the welding joint on the right side has the condition of welding cold joint, increasing the welding voltage and welding time in the CH2 mode, outputting a welding voltage CH2 +. DELTA.CH (such as 12V), a welding time Weld2 +. DELTA.t (such as 8s), and leading the current direction of the welding electrode to flow out of the left welding electrode and into the right welding electrode through the connecting piece; this voltage frequency CH2 +. DELTA.CH may further enhance the weld strength of the right hand weld. The welding point strength is higher when the current is higher and the welding time is longer, but burning rarely occurs. The mode of changing the voltage frequency CH1/CH2 of power supply equipment further changes the direction of welding current of the left welding electrode and the right welding electrode, adjusts the intensity of output current on the left side and the right side, and can adjust the welding time at the same time to obtain the stable welding strength of the top cover connecting sheet of the two welding spots.
Example 2: resistance welding of a square multi-tab winding battery core current collector tab and a switching piece: in the process of manufacturing the square hard shell lithium ion battery cell, after the procedures of homogenizing, coating, cold pressing, die cutting, slitting and winding, the lug of the naked battery cell and the adapter plate are welded and assembled. After the current collector is matched with the aluminum material adapter plate or the copper material adapter plate, the surface of the material is confirmed to be clean and well contacted, and resistance welding is started after the left welding electrode structure and the right welding electrode structure are well contacted.
The welding power supply is adjusted to be in a CH1 mode, the welding voltage is CH1 (generally 10V), the welding time is Weld1 (value is 6s), the current direction of the welding electrode flows out from the right welding electrode and flows into the left welding electrode through the connecting piece, after welding, if no welding cold joint exists at the right welding point, the welding voltage is adjusted to be in a CH2 mode, namely welding voltage is CH2 (generally 10V), welding time is Weld2 (value is 5s), the current direction of the welding electrode is led out from the left welding electrode, flows into the right welding electrode through the connecting sheet, if the welding joint on the right side has the condition of welding cold joint, increasing the welding voltage and welding time in the CH2 mode, outputting a welding voltage CH2 +. DELTA.CH (such as 12V), a welding time Weld2 +. DELTA.t (such as 7s), and leading the current direction of the welding electrode to flow out of the left welding electrode and into the right welding electrode through the connecting piece; this voltage frequency CH2 +. DELTA.CH may further enhance the weld strength of the right hand weld. The welding point strength is higher when the current is higher and the welding time is longer, but burning rarely occurs. The mode of changing the voltage frequency CH1/CH2 of power supply equipment is changed, so that the directions of welding currents of the left welding electrode and the right welding electrode are changed, the output current intensity of the left side and the right side is adjusted, meanwhile, the welding time can be adjusted, and the stable welding intensity of the square multi-tab winding battery core current collector is obtained.
Example 3: in the process of manufacturing a soft-package battery cell, after the procedures of homogenizing, coating, cold pressing, die cutting, slitting and winding, the lug of a naked battery cell is welded with Ni and Al Tab. After the Tab is matched with the Tab made of aluminum and nickel materials, the surfaces of the materials are confirmed to be clean and well contacted, resistance welding is started after the left welding electrode structure and the right welding electrode structure are well contacted,
the welding power supply is adjusted to be in a CH1 mode, the welding voltage is CH1 (generally 10V), the welding time is Weld1 (value is 6s), the current direction of the welding electrode flows out from the right welding electrode and flows into the left welding electrode through the connecting piece, after welding, if no welding cold joint exists at the right welding point, the welding voltage is adjusted to be in a CH2 mode, namely welding voltage is CH2 (generally 10V), welding time is Weld2 (value is 5s), the current direction of the welding electrode is led out from the left welding electrode, flows into the right welding electrode through the connecting sheet, if the welding joint on the right side has the condition of welding cold joint, increasing the welding voltage and welding time in the CH2 mode, outputting a welding voltage CH2 +. DELTA.CH (such as 12V), a welding time Weld2 +. DELTA.t (such as 7s), and leading the current direction of the welding electrode to flow out of the left welding electrode and into the right welding electrode through the connecting piece; this voltage frequency CH2 +. DELTA.CH may further enhance the weld strength of the right hand weld. The welding point strength is higher when the current is higher and the welding time is longer, but burning rarely occurs. Compared with other batteries, the lithium ion battery has the advantages of high energy density, high voltage, high rate performance and the like, and particularly in practical application scenes such as high energy density, high rate, quick charge and the like, the battery, a battery Tab and a Tab connecting bar are required to have high overcurrent capacity and reliable connection strength. Therefore, reliable connection strength and strong overcurrent capacity can be ensured by adopting a plurality of welding electrodes, and the phenomenon that larger ohmic impedance further influences the electrical performance of the battery is avoided; particularly, the invention innovatively provides multi-electrode positive and negative current alternative welding, the strength of a welding point can be adjusted according to actual conditions, the welding strength of a plurality of welding points is ensured to be uniform, and the situations of insufficient welding, burning, over-welding and the like are avoided; the mode of changing power supply unit's voltage frequency CH1/CH2, and then two welding electrode welding current's direction about changing, the output current intensity of side about the adjustment, can adjust the welding time simultaneously, obtain the stable soft-packaged electrical core utmost point ear Tab welding strength of a plurality of solder joints.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (4)
1. A resistance weld structure for a lithium ion battery, the structure comprising:
the welding device comprises n welding electrodes and a welding power supply, wherein the n welding electrodes are electrically connected with the welding power supply, the positive and negative electric properties of two adjacent welding electrodes are opposite, and n is more than or equal to 2.
2. The lithium ion battery resistance welding structure of claim 1, wherein the welding material is a copper terminal or a Ni terminal of a battery connecting sheet or a copper terminal or a Ni terminal of a battery current collector, and the thickness of the welding material is 0.4 mm.
3. The welding method of the lithium ion battery resistance welding structure according to claim 1 or 2, characterized in that the welding method is specifically as follows:
s1, the welding power supply outputs welding voltage CH1, namely the welding voltage between two adjacent welding electrodes is CH1, and the welding time is Weld 1;
s2, after welding, the welding power supply outputs welding voltage CH2, namely the welding voltage between two adjacent welding electrodes is CH2, and the welding time is Weld 2;
s3, after welding, circularly executing the step S1 and the step S2 until welding is finished;
the welding voltage CH1 and the welding voltage CH2 form a welding current in opposite directions at each welding point.
4. The welding method based on the lithium ion battery resistance welding structure as claimed in claim 3, wherein after the welding of the current cycle, whether the corresponding welding point has the cold joint is detected, and if the detection result is yes, the welding voltage and the welding time of the next welding cycle are increased.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010689207.XA CN111889858A (en) | 2020-07-15 | 2020-07-15 | Resistance welding structure and welding method of lithium ion battery |
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| CN202010689207.XA CN111889858A (en) | 2020-07-15 | 2020-07-15 | Resistance welding structure and welding method of lithium ion battery |
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| CN111889858A true CN111889858A (en) | 2020-11-06 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1180599A (en) * | 1996-09-11 | 1998-05-06 | 宫地技术株式会社 | Method and apparatus for controlling resistance welding |
| CN1757138A (en) * | 2003-01-23 | 2006-04-05 | 索尼株式会社 | Lead terminal and power supply device |
| CN101192656A (en) * | 2006-11-25 | 2008-06-04 | 深圳市比克电池有限公司 | Manufacturing method of battery |
| CN101542842A (en) * | 2006-11-20 | 2009-09-23 | 株式会社Lg化学 | Method for connection of conductive member to device |
| CN102652373A (en) * | 2010-02-15 | 2012-08-29 | 株式会社新王材料 | Cladding material for leads and method of welding cladding material for leads |
| CN103331511A (en) * | 2013-07-03 | 2013-10-02 | 林青云 | Electric resistance welding method, electrode welding head using electric resistance welding method and electrode welding head used in electric resistance welding method |
| JP2013248634A (en) * | 2012-05-31 | 2013-12-12 | Honda Motor Co Ltd | Resistance welding equipment and resistance welding method |
| CN111354909A (en) * | 2020-04-24 | 2020-06-30 | 福建南平延平区南孚新能源科技有限公司 | Button battery pole shell and electrode lug traceless welding method, welding structure and product |
-
2020
- 2020-07-15 CN CN202010689207.XA patent/CN111889858A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1180599A (en) * | 1996-09-11 | 1998-05-06 | 宫地技术株式会社 | Method and apparatus for controlling resistance welding |
| CN1757138A (en) * | 2003-01-23 | 2006-04-05 | 索尼株式会社 | Lead terminal and power supply device |
| CN101542842A (en) * | 2006-11-20 | 2009-09-23 | 株式会社Lg化学 | Method for connection of conductive member to device |
| CN101192656A (en) * | 2006-11-25 | 2008-06-04 | 深圳市比克电池有限公司 | Manufacturing method of battery |
| CN102652373A (en) * | 2010-02-15 | 2012-08-29 | 株式会社新王材料 | Cladding material for leads and method of welding cladding material for leads |
| JP2013248634A (en) * | 2012-05-31 | 2013-12-12 | Honda Motor Co Ltd | Resistance welding equipment and resistance welding method |
| CN103331511A (en) * | 2013-07-03 | 2013-10-02 | 林青云 | Electric resistance welding method, electrode welding head using electric resistance welding method and electrode welding head used in electric resistance welding method |
| CN111354909A (en) * | 2020-04-24 | 2020-06-30 | 福建南平延平区南孚新能源科技有限公司 | Button battery pole shell and electrode lug traceless welding method, welding structure and product |
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Application publication date: 20201106 |