CN115870659A - Method for determining foil welding parameters - Google Patents
Method for determining foil welding parameters Download PDFInfo
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- CN115870659A CN115870659A CN202211668388.3A CN202211668388A CN115870659A CN 115870659 A CN115870659 A CN 115870659A CN 202211668388 A CN202211668388 A CN 202211668388A CN 115870659 A CN115870659 A CN 115870659A
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- Prior art keywords
- foil
- welding
- tensile strength
- substitute
- process parameters
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- 238000003466 welding Methods 0.000 title claims abstract description 93
- 239000011888 foil Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 67
- 230000008569 process Effects 0.000 claims abstract description 47
- 238000002474 experimental method Methods 0.000 claims description 19
- 230000003068 static effect Effects 0.000 claims description 11
- 230000006872 improvement Effects 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011530 conductive current collector Substances 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
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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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- Resistance Welding (AREA)
Abstract
The application discloses a method for determining foil welding parameters, which comprises the steps of determining the minimum tensile strength required by a welded foil; selecting a substitute foil; determining the tensile strength of the substitute foil after welding under different process parameters; selecting all the substitute foils which are welded and have the minimum tensile strength, and recording substitute process parameters corresponding to the substitute foils; and calculating the power consumption corresponding to all the alternative process parameters, and determining the alternative process parameter corresponding to the lowest power consumption. According to the method, the substitute foil is welded under different process parameters, the tensile strength of the welded foil is recorded, and the substitute process parameters corresponding to the lowest power consumption are determined by combining the power consumption, so that the expected welding effect is achieved by the lowest power consumption, and cost reduction and efficiency improvement are realized.
Description
Technical Field
The application relates to the technical field of current collector foils, in particular to a method for determining welding parameters of a foil.
Background
In recent years, cylindrical lithium ion batteries occupy a place in the new energy market developed vigorously nowadays due to the advantages of mature technology, high yield, low cost, excellent performance and the like, and 21700 type batteries are typical cylindrical lithium ion batteries, have the diameter of 21mm and the height of 70mm, have increased volume and space utilization rate compared with 18650 type batteries, improve the energy density of a single battery cell and a system, and are widely applied to digital products, electric vehicles, balance cars, solar lithium ion battery street lamps, LED lamps, electric tools and the like.
With the higher density of the cylindrical battery, the thickness of the used foil of the positive and negative electrode current collectors is thinner and thinner, and the currently used foil is gradually reduced from 10 micrometers to 8 micrometers and 6 micrometers. Variations in foil thickness force production process parameters to change accordingly. In the tab welding process, if a pole piece produced by a thin foil is used, welding process parameters such as welding power, vibration frequency, amplitude, static pressure, welding time and the like need to be further adjusted.
Therefore, if proper welding process parameters can be determined in the production process, the actual production can be further guided, and cost reduction and efficiency improvement can be realized.
Disclosure of Invention
In view of the above, it is necessary to provide a method for determining welding parameters of a current collector foil in order to solve the above technical problems.
The method comprises the following steps:
determining the minimum tensile strength required by the welded foil;
selecting a substitute foil;
determining the tensile strength of the substitute foil after welding under different process parameters;
selecting all the substitute foils which are welded and have the tensile strength not less than the minimum tensile strength, and recording the substitute process parameters corresponding to the substitute foils;
and calculating power consumption corresponding to all the alternative process parameters, and determining the alternative process parameter corresponding to the lowest power consumption.
In some embodiments, the tensile strength is a machine direction tensile strength or a cross direction tensile strength.
In some embodiments, determining the minimum tensile strength required for the welded foil comprises: the foil applied in the prior art is selected as the replaced foil, the tensile strength of the replaced foil after welding is determined, and the minimum tensile strength required by the foil after welding is determined.
In some embodiments, an alternative foil is selected that includes:
and selecting a foil with the thickness smaller than that of the replaced foil as the replaced foil.
In some embodiments, the process parameters include weld static pressure, weld time, weld delay time, weld dwell time, and/or weld amplitude.
In some embodiments, determining the tensile strength of the replacement foil after welding under different process parameters comprises:
selecting any one or more process parameters of welding amplitude, welding static pressure, welding time, welding delay time and welding pressure maintaining time as variables, selecting other process parameters as constants, setting a plurality of welding comparison experiments, and determining the tensile strength of the substitute foil corresponding to the plurality of welding comparison experiments.
In some embodiments, determining the tensile strength of the replacement foil after welding under different process parameters further comprises:
the above steps are repeated until all process parameters have been selected as variables.
In some embodiments, several welding control experiments were set up, including:
several welding control experiments were set up with variable isocratic gradients.
In some embodiments, further comprising:
the process parameters in several welding control experiments are arranged into a data table.
In some embodiments, further comprising: and calculating the power consumption corresponding to all the alternative process parameters by combining the data table.
Compared with the prior art, the beneficial effects of this application are: according to the method, the substitute foil is welded under different process parameters, the tensile strength of the welded foil is recorded, and the substitute process parameters corresponding to the lowest power consumption are determined by combining the power consumption, so that the expected welding effect is achieved by the lowest power consumption, and cost reduction and efficiency improvement are realized.
Drawings
Fig. 1 is a schematic flowchart of a method for determining foil welding parameters according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In combination with the background art, the foil current collector may be a fifth major component of a lithium battery, but may also be classified as a part of the positive and negative electrode materials. It is electrolytic aluminum foil of the anode conductive current collector and electrolytic copper foil of the cathode conductive current collector. The thickness of the anode aluminum foil is 10-20 microns generally, the thickness of the cathode copper foil is 7-15 microns generally, and the thickness of the anode foil and the cathode foil is continuously reduced along with the improvement of the technical level.
With the higher density of the cylindrical battery, the thickness of the used foil of the positive and negative current collectors is thinner, and the currently used foil is gradually reduced from 10 micrometers to 8 micrometers and 6 micrometers. Variations in foil thickness force production process parameters to change accordingly. In the tab welding process, if a pole piece produced by a thin foil is used, welding process parameters such as welding power, vibration frequency, amplitude, static pressure, welding time and the like need to be further adjusted. Therefore, if proper welding process parameters can be determined in the production process, the actual production can be further guided, and cost reduction and efficiency improvement can be realized.
In order to improve the above problems, the present application proposes a method for determining foil welding parameters, comprising:
s1, determining the minimum tensile strength required by the welded foil.
In the present exemplary embodiment, the steps specifically include:
s11, selecting the foil applied in the prior art as the replaced foil.
And S12, determining the tensile strength of the replaced foil after welding, and determining the minimum tensile strength required by the foil after welding.
Further, the tensile strength proposed for the foil in the present application is a longitudinal tensile strength or a transverse tensile strength, and the tensile strength after welding refers to the longitudinal tensile strength or the transverse tensile strength at the welding point.
S2, selecting a substitute foil.
With the density of the cylindrical battery becoming higher and higher, the thickness of the foil of the positive and negative current collectors used therein becomes thinner and thinner, and the currently used foil is gradually reduced from 10 μm to 8 μm and 6 μm.
And S3, determining the tensile strength of the substitute foil after welding under different process parameters.
In this exemplary embodiment, the process parameters include a static welding pressure, a welding time, a welding delay time, a welding pressure holding time, and/or a welding amplitude, and the steps specifically include:
s31, selecting any one or more process parameters of welding amplitude, welding static pressure, welding time, welding delay time and welding pressure maintaining time as variables, and selecting other process parameters as constants.
S32, setting a plurality of welding control experiments, and determining the tensile strength of the substitute foil corresponding to the welding control experiments. Further, the setting of the plurality of welding control experiments specifically includes setting the plurality of welding control experiments in a gradient of a variable and the like.
In the exemplary embodiment, taking the welding amplitude as an example, it is determined that the static welding pressure is 0.18Mpa, the welding time is 0.11s, the welding delay time is 0.13s, the welding dwell time is 0.08s, the welding amplitude is 40% -70%, and four welding control tests are set with a gradient of 10%.
In the exemplary embodiment, the welding static pressure is selected as a variable, the welding amplitude is determined to be 50%, the welding time is 0.11s, the welding delay time is 0.13s, the welding pressure maintaining time is 0.08s, the welding static pressure is 0.1MPa-0.18MPa, and eight welding comparison tests are set by taking 0.01MPa as a gradient.
In some embodiments, taking the welding amplitude as a variable as an example, a plurality of welding control experiments can also be set in unequal gradients, such as setting the welding amplitude to be 40%, 50%, 60%, 65%, 68%, 71%, 74%, and seven welding control experiments.
And S33, arranging the process parameters in a plurality of welding control experiments into a data table. Taking "the welding amplitude is taken as a variable as an example, a plurality of welding control experiments can also be set in an unequal gradient, such as seven welding control experiments, wherein the welding amplitudes are set to be 40%, 50%, 60%, 65%, 68%, 71% and 74%. "is an example.
And S34, repeating the steps until all the process parameters are selected as variables.
And S4, selecting all the substitute foils which are welded and have the tensile strength not less than the minimum tensile strength, and recording the corresponding substitute process parameters of the substitute foils.
And S5, calculating power consumption corresponding to all the alternative process parameters by combining the data table in the S33, determining the alternative process parameter corresponding to the lowest power consumption, and determining the alternative process parameter as the optimal foil welding parameter.
Finally, it should be noted that: although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method of determining foil welding parameters, comprising:
determining the minimum tensile strength required by the welded foil;
selecting a substitute foil;
determining the tensile strength of the substitute foil after welding under different process parameters;
selecting all the substitute foils which are welded and not less than the minimum tensile strength, and recording substitute process parameters corresponding to the substitute foils;
and calculating the power consumption corresponding to all the alternative process parameters, and determining the alternative process parameter corresponding to the lowest power consumption.
2. The method of claim 1, wherein the tensile strength is a machine direction tensile strength or a cross direction tensile strength.
3. The method of claim 1, wherein said determining a minimum tensile strength required for the welded foil comprises:
the foil applied in the prior art is selected as a replaced foil, the tensile strength of the replaced foil after welding is determined, and the minimum tensile strength required by the foil after welding is determined.
4. The method of claim 1, wherein said selecting a substitute foil comprises:
and selecting a foil with the thickness smaller than that of the replaced foil as the replaced foil.
5. The method of claim 1, wherein the process parameters comprise weld static pressure, weld time, weld delay time, weld dwell time, and/or weld amplitude.
6. The method of claim 5, wherein said determining the tensile strength of said substitute foil after welding at different process parameters comprises:
selecting any one or more of the welding amplitude, the welding static pressure, the welding time, the welding delay time and the welding pressure maintaining time as variables, selecting other process parameters as constants, setting a plurality of welding control experiments, and determining the tensile strength of the substitute foil corresponding to the plurality of welding control experiments.
7. The method of claim 5, wherein determining the tensile strength of the substitute foil after welding at different process parameters further comprises:
and repeating the steps until all the process parameters are selected as variables.
8. The method of claim 6, wherein the setting up a number of weld control experiments comprises:
several welding control experiments were set up with an equal gradient of the variables.
9. The method of claim 8, further comprising:
the process parameters in several welding control experiments are organized into a data sheet.
10. The method of claim 9, further comprising:
and calculating power consumption corresponding to all the alternative process parameters by combining the data table.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211668388.3A CN115870659A (en) | 2022-12-23 | 2022-12-23 | Method for determining foil welding parameters |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211668388.3A CN115870659A (en) | 2022-12-23 | 2022-12-23 | Method for determining foil welding parameters |
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| CN115870659A true CN115870659A (en) | 2023-03-31 |
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|---|---|---|---|---|
| CN101072655A (en) * | 2004-12-15 | 2007-11-14 | 弗罗纽斯国际有限公司 | Method and device for combined laser-arc welding with control of laser unit according to welding torch |
| CN110614416A (en) * | 2019-08-19 | 2019-12-27 | 江苏师范大学 | Method for optimizing welding parameters of dual-phase high-strength steel |
| CN110744192A (en) * | 2019-11-21 | 2020-02-04 | 徐州安普瑞特能源科技有限公司 | Laser self-fluxing welding process for low-alloy high-strength steel |
| CN114247974A (en) * | 2020-09-23 | 2022-03-29 | 长城汽车股份有限公司 | Method for determining welding parameters of steel plate resistance spot welding process |
-
2022
- 2022-12-23 CN CN202211668388.3A patent/CN115870659A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| CN101072655A (en) * | 2004-12-15 | 2007-11-14 | 弗罗纽斯国际有限公司 | Method and device for combined laser-arc welding with control of laser unit according to welding torch |
| CN110614416A (en) * | 2019-08-19 | 2019-12-27 | 江苏师范大学 | Method for optimizing welding parameters of dual-phase high-strength steel |
| CN110744192A (en) * | 2019-11-21 | 2020-02-04 | 徐州安普瑞特能源科技有限公司 | Laser self-fluxing welding process for low-alloy high-strength steel |
| CN114247974A (en) * | 2020-09-23 | 2022-03-29 | 长城汽车股份有限公司 | Method for determining welding parameters of steel plate resistance spot welding process |
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