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CN111992886A - Method for stacking and parallel welding of battery cell tabs - Google Patents

Method for stacking and parallel welding of battery cell tabs Download PDF

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Publication number
CN111992886A
CN111992886A CN202010910876.5A CN202010910876A CN111992886A CN 111992886 A CN111992886 A CN 111992886A CN 202010910876 A CN202010910876 A CN 202010910876A CN 111992886 A CN111992886 A CN 111992886A
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CN
China
Prior art keywords
welding
utmost point
point ear
nickel
thickness
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Pending
Application number
CN202010910876.5A
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Chinese (zh)
Inventor
黄志伟
曾思翰
王永华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuhai Cosmx Power Co Ltd
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Zhuhai Cosmx Power Co Ltd
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Application filed by Zhuhai Cosmx Power Co Ltd filed Critical Zhuhai Cosmx Power Co Ltd
Priority to CN202010910876.5A priority Critical patent/CN111992886A/en
Publication of CN111992886A publication Critical patent/CN111992886A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20Bonding
    • B23K26/21Bonding by welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00Soldering, e.g. brazing, or unsoldering
    • B23K1/0008Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/60Preliminary treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00Articles made by soldering, welding or cutting
    • B23K2101/36Electric or electronic devices
    • B23K2101/42Printed circuits

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

A method for overlapping and parallel welding of battery cell tabs belongs to the field of electrochemistry, and comprises the following specific scheme: a method for overlapping and parallel welding of battery core tabs comprises the following steps: welding a nickel sheet on a PCB; step two, arranging a plurality of battery cells in pairs in an opposite manner, and horizontally superposing the lugs with the same polarity of the two oppositely arranged battery cells on nickel sheets to form a laminated structure which is sequentially provided with a lug I, a lug II and the nickel sheets from top to bottom; and step three, welding the tab I, the tab II and the nickel sheet together by adopting a laser welding technology. The scheme technically breaks through the limitation that the traditional PACK laser welding technology can only spot-weld two layers of metal; structurally, the space required by the series-parallel connection of the battery cells is reduced, and the actual capacity and the production efficiency of the battery are improved; the method has great advantages in improving the battery capacity and reducing the material cost; the PACK assembly time is reduced.

Description

Method for stacking and parallel welding of battery cell tabs
Technical Field
The invention belongs to the field of electrochemistry, and particularly relates to a method for overlapping and parallel welding of battery cell tabs.
Background
In recent years, electronic integrated circuits that follow moore's law have been developed at a high rate. The mobile electronic products are continuously making breakthrough in integration level, data processing and throughput, so that the energy consumption of the products is continuously increased. The battery is used as an energy storage module of a mobile electronic product, and the capacity and the energy density cannot be greatly improved all the time due to the limitation of a chemical system and a physical law of the battery. The inefficiency of batteries has severely limited the development of the mobile electronic product industry, greatly reducing the end user experience. Therefore, how to increase the volume ratio of the battery core in the battery; how to design a battery PACK scheme with high integration level and large capacity; the problem to be solved is urgent.
At present, no mature lug overlapping welding scheme exists in the notebook battery PACK industry. Only a few PACK plants will use ultrasonic delamination for welding. But the efficiency of ultrasonic welding is low; and when welding the upper layer of the pole lug, the lower layer of the welded pole lug can be pulled due to pressure, vibration and the like, so that the problems of welding release and the like are caused. Therefore, the tab overlapping welding process is not yet practically applied in the production of notebook battery PACK at present.
Disclosure of Invention
The invention aims to overcome the defects of ultrasonic welding, solve the problem that multilayer metal cannot be reliably welded in the prior art and provide a method for welding cell lugs in a superposed and parallel manner.
The purpose of the invention is realized by the following technical scheme:
a method for overlapping and parallel welding of battery core tabs comprises the following steps:
welding a nickel sheet on a PCB;
step two, arranging a plurality of battery cells in pairs in an opposite manner, and horizontally superposing the lugs with the same polarity of the two oppositely arranged battery cells on nickel sheets to form a laminated structure which is sequentially provided with a lug I, a lug II and the nickel sheets from top to bottom;
and step three, welding the tab I, the tab II and the nickel sheet together by adopting a laser welding technology.
Further, in the step one, the nickel sheet is soldered on the battery protection PCB circuit board by an SMT process.
Further, in step three, the method for determining the laser welding focal length of the laser welding technology comprises: and selecting a distance in a range of 15-25% of the total thickness of the welding laminated structure as a laser welding focal distance by using an experimental verification method and applying a single-factor data analysis tool and a contour map analysis tool.
Further, in the third step, after the laser welding focal length is determined, the peak value and the welding time of the laser welding are adjusted by using an experimental verification method and applying a single-factor data analysis and contour line analysis tool, and a stable molten pool with the diameter change of less than 20 percent and the fusion depth of 70-80 percent of the total thickness of the laminated structure is obtained.
Preferably, the thickness of the nickel sheet is 0.2mm, the materials of the lug I (4) and the lug II (3) are pure nickel, the thicknesses of the lug I (4) and the lug II (3) are 0.08mm, and the negative focal distance is 0.065mm below the upper lug I (4).
Preferably, the thickness of nickel piece is 0.2mm, and the material of utmost point ear I (4) and utmost point ear II (3) is pure nickel, and the thickness of utmost point ear I (4) and utmost point ear II (3) is 0.1mm, and the negative focal distance is 0.075mm below the upper extreme ear I (4).
Preferably, the thickness of the nickel sheet is 0.2mm, the materials of the lug I (4) and the lug II (3) are pure nickel, the thicknesses of the lug I (4) and the lug II (3) are 0.08mm, the welding peak value is 1.7 +/-0.1 Kw, and the welding time is 1.6 +/-0.1 mS.
Preferably, the thickness of the nickel sheet is 0.2mm, the materials of the lug I (4) and the lug II (3) are both copper nickel plating, the thicknesses of the lug I (4) and the lug II (3) are both 0.08mm, the welding peak value is 1.5 +/-0.1 Kw, and the welding time is 1.3 +/-0.1 mS.
Compared with the prior art, the invention has the following advantages:
the scheme technically breaks through the limitation that the traditional PACK laser welding technology can only spot-weld two layers of metal; structurally, the space required by the series-parallel connection of the battery cells is reduced, and the actual capacity and the production efficiency of the battery are improved; compared with the conventional scheme, the method can save half of the using amount of the nickel sheets, reduce the width of the protective plate by more than 6mm, has great advantages in improving the battery capacity, and can also reduce the material cost (PCB area and the number of the nickel sheets); the PACK assembly time is reduced.
Drawings
FIG. 1: a schematic diagram of a superposed parallel welding structure of battery cell tabs;
FIG. 2: a battery tab is superposed and connected with a welding space layout diagram;
FIG. 3: overlapping and connecting the thin battery tabs in parallel to weld a spatial layout diagram;
in the figure: 1. PCB circuit board, 2, nickel sheet, 3, utmost point ear II, 4, utmost point ear I.
Detailed Description
The technical solutions of the present invention are further described below with reference to fig. 1 to 3, but not limited thereto, and modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, and all such modifications or equivalents are intended to be covered by the scope of the present invention.
In the battery structure, the battery core and the circuit protection board are parts which occupy a relatively large volume. In order to increase the battery capacity under the energy density of the existing battery core, the size of the protective plate must be reduced, and the volume ratio occupied by the battery core is increased. In order to achieve the purpose, the invention mainly uses a method of welding the tabs in a superposed and parallel manner to reduce the process space required by the protection plate in the series-parallel connection of the battery cells and achieve the purpose of capacity increase.
Detailed description of the invention
As shown in fig. 2, when the ID thickness space is sufficient, the tabs with the same polarity of the opposite cell are connected in parallel to the same nickel plate by laser welding in a double-sided cloth manner, so as to design the cell volume ratio to the maximum. The method comprises the following specific steps:
step one, using a 0.2mm nickel sheet 2 as a bottom layer, and tin-welding the nickel sheet on a battery protection PCB 1 through an SMT process; the battery protection PCB is communicated with the electronic element through an internal copper foil circuit to form a protection circuit;
secondly, superposing oppositely arranged homopolar lugs on a 0.2mm nickel sheet 2 on a battery protection PCB (printed Circuit Board) 1, and pressing three layers of metal to be flat by using a clamp to ensure good lamination, so as to form a laminated structure of a lug I4, a lug II 3 and the nickel sheet 2 from top to bottom in sequence;
and step three, welding the tab I4, the tab II 3 and the nickel sheet 2 together by adopting a laser welding technology.
Further, in the third step, an experimental verification method is used, a single-factor data analysis and contour map analysis tool is used, and a distance in a range of 15% -25% of the total thickness of the welding laminated structure is selected as a laser welding focal distance, so that the penetration depth of 70% -80% of the total thickness of the penetration laminated structure is obtained;
the laser welding focal length of the welding laminated structure with the total thickness ranging from 15% to 25% is to search a light spot with the diameter ranging from 30 microns to 80 microns by adjusting the welding focal length, so that the effect of penetrating nickel metal on two layers of tabs is achieved.
In order to obtain the penetration depth of 70-80% of the total thickness of the penetrating laminated structure, taking two layers of 0.08mm pure nickel tabs and one layer of 0.2mm nickel sheet 2 as an example, the preferred negative focal distance is 0.065mm below the tab I4;
after the focal length is determined, adjusting the peak value and the welding time of laser welding by using an experimental verification method and applying a single-factor data analysis and contour map analysis tool to obtain a stable molten pool with the diameter change of less than 20 percent and the fusion depth of 70-80 percent of the total thickness of the laminated structure;
in order to obtain a stable molten pool, taking two layers of 0.08mm nickel lugs and one layer of 0.2mm nickel sheet 2 as an example, the preferable welding peak value is 1.7 +/-0.1 Kw, and the welding time is 1.6 +/-0.1 mS;
by adjusting the welding focal length, the welding peak value and the welding time in the above mode, welding is carried out, a welding pool with the pulling force of more than 30N after welding is obtained, and the purposes of not penetrating welding and virtual welding and firmly welding three layers of metal materials are achieved.
Detailed description of the invention
As shown in fig. 3, under the condition that the ID thickness space is insufficient, at least one group of tabs with the same polarity in the opposite side cells are connected in parallel to the same nickel plate by laser welding, so as to make room for arranging circuit board components.
The method comprises the following specific steps:
step one, using a 0.2mm nickel sheet 2 as a bottom layer, and tin-welding the nickel sheet on a battery protection PCB 1 through an SMT process; the battery protection PCB is communicated with the electronic element through an internal copper foil circuit to form a protection circuit;
secondly, superposing oppositely arranged homopolar lugs on a 0.2mm nickel sheet 2 on a battery protection PCB (printed Circuit Board) 1, and pressing three layers of metal to be flat by using a clamp to ensure good lamination, so as to form a laminated structure of a lug I4, a lug II 3 and the nickel sheet 2 from top to bottom in sequence;
and step three, welding the tab I4, the tab II 3 and the nickel sheet 2 together by adopting a laser welding technology.
Further, in the third step, an experimental verification method is used, a single-factor data analysis and contour map analysis tool is used, and a distance in a range of 15% -25% of the total thickness of the welding laminated structure is selected as a laser welding focal distance, so that the penetration depth of 70% -80% of the total thickness of the penetration laminated structure is obtained;
in order to obtain the penetration depth of 70-80% of the total thickness of the penetrating laminated structure, taking two layers of 0.08mm nickel tabs and one layer of 0.2mm nickel sheet 2 as an example, the preferred negative focal distance is 0.065mm below the tab I4;
after the focal length is determined, adjusting the peak value and the welding time of laser welding by using an experimental verification method and applying a single-factor data analysis and contour map analysis tool to obtain a molten pool with the diameter change of less than 20 percent and the fusion depth of 70-80 percent of the total thickness of the laminated structure;
in order to obtain a stable molten pool, taking two layers of 0.08mm nickel lugs and one layer of 0.2mm nickel sheet 2 as an example, the preferable welding peak value is 1.7 +/-0.1 Kw, and the welding time is 1.6 +/-0.1 mS;
the welding focal length, the welding peak value and the welding time are adjusted in the above mode, and welding is carried out. And obtaining a welding pool with the tension of more than 30N after welding, so as to achieve the purposes of not penetrating welding and insufficient welding and firmly welding three layers of metal materials.

Claims (8)

1. A method for superposing and parallel welding of battery cell tabs is characterized by comprising the following steps:
firstly, welding a nickel sheet (2) on a PCB (printed circuit board) (1);
step two, arranging a plurality of electric cores in pairs in an opposite manner, horizontally superposing lugs with the same polarity of the two oppositely arranged electric cores on a nickel sheet (2) to form a laminated structure which sequentially comprises a lug I (4), a lug II (3) and the nickel sheet (2) from top to bottom;
and step three, welding the lug I (4), the lug II (3) and the nickel sheet (2) together by adopting a laser welding technology.
2. The method of claim 1, wherein the cell tabs are welded in a stacked and parallel manner, and the method comprises the following steps: in the first step, the nickel sheet (2) is soldered on the battery protection PCB circuit board (1) through an SMT process.
3. The method of claim 1, wherein the cell tabs are welded in a stacked and parallel manner, and the method comprises the following steps: in the third step, the method for determining the laser welding focal length of the laser welding technology comprises the following steps: and selecting a distance in a range of 15-25% of the total thickness of the welding laminated structure as a laser welding focal distance by using an experimental verification method and applying a single-factor data analysis tool and a contour map analysis tool.
4. The method of claim 3, wherein the cell tabs are welded in a stacked and parallel manner, and the method comprises the following steps: in the third step, after the laser welding focal length is determined, the peak value and the welding time of the laser welding are adjusted by using an experimental verification method and applying a single-factor data analysis tool and an isoline analysis tool, so that a stable molten pool with the diameter change of less than 20 percent and the fusion depth of 70 to 80 percent of the total thickness of the laminated structure is obtained.
5. The method of claim 3, wherein the cell tabs are welded in a stacked and parallel manner, and the method comprises the following steps: the thickness of nickel piece is 0.2mm, and the material of utmost point ear I (4) and utmost point ear II (3) is pure nickel, and the thickness of utmost point ear I (4) and utmost point ear II (3) is 0.08mm, and the negative focal distance is 0.065mm below the utmost point ear I (4) of upper strata.
6. The method of claim 3, wherein the cell tabs are welded in a stacked and parallel manner, and the method comprises the following steps: the thickness of nickel piece is 0.2mm, and the material of utmost point ear I (4) and utmost point ear II (3) is pure nickel, and the thickness of utmost point ear I (4) and utmost point ear II (3) is 0.1mm, and the negative focal distance is 0.075mm below the utmost point ear I (4) of upper strata department.
7. The method of claim 4, wherein the cell tabs are welded in a stacked and parallel manner, and the method comprises the following steps: the thickness of nickel piece is 0.2mm, and the material of utmost point ear I (4) and utmost point ear II (3) is pure nickel, and the thickness of utmost point ear I (4) and utmost point ear II (3) is 0.08mm, and the welding peak value is 1.7 +/-0.1 Kw, and the welding time is 1.6 +/-0.1 mS.
8. The method of claim 4, wherein the cell tabs are welded in a stacked and parallel manner, and the method comprises the following steps: the thickness of nickel piece is 0.2mm, and the material of utmost point ear I (4) and utmost point ear II (3) is the copper nickel plating, and the thickness of utmost point ear I (4) and utmost point ear II (3) is 0.08mm, and the welding peak value is 1.5 +/-0.1 Kw, and the welding time is 1.3 +/-0.1 mS.
CN202010910876.5A 2020-09-02 2020-09-02 Method for stacking and parallel welding of battery cell tabs Pending CN111992886A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112894137A (en) * 2021-03-04 2021-06-04 武汉逸飞激光股份有限公司 Ultra-thin tab welding method
CN113385814A (en) * 2021-06-21 2021-09-14 远景动力技术(江苏)有限公司 Laser welding method and device for multilayer tabs and lithium battery

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112894137A (en) * 2021-03-04 2021-06-04 武汉逸飞激光股份有限公司 Ultra-thin tab welding method
CN113385814A (en) * 2021-06-21 2021-09-14 远景动力技术(江苏)有限公司 Laser welding method and device for multilayer tabs and lithium battery

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Application publication date: 20201127