CN114799594A - Welding quality control method for square module bus - Google Patents

Welding quality control method for square module bus Download PDF

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Publication number
CN114799594A
CN114799594A CN202210347469.7A CN202210347469A CN114799594A CN 114799594 A CN114799594 A CN 114799594A CN 202210347469 A CN202210347469 A CN 202210347469A CN 114799594 A CN114799594 A CN 114799594A
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China
Prior art keywords
welding
module
deviation
stacking assembly
ccd camera
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Pending
Application number
CN202210347469.7A
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Chinese (zh)
Inventor
陈子胜
王晓秋
马九思
王威
张林立
王甫峰
刘春辉
沈连生
王宁
鲍玥冰
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FAW Group Corp
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FAW Group Corp
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Application filed by FAW Group Corp filed Critical FAW Group Corp
Priority to CN202210347469.7A priority Critical patent/CN114799594A/en
Publication of CN114799594A publication Critical patent/CN114799594A/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
    • B23K31/00Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or 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
    • B23K37/00Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/02Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections

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

Abstract

The invention belongs to the technical field of new energy automobile bus bar welding, and particularly relates to a welding quality control method for a square module bus bar; the method comprises the steps of detecting the position deviation of the electric core pole before welding, controlling parameters in the welding process, detecting the welding depth by 100% on line, and detecting the appearance vision of the welded welding line, so that the effective control of the welding quality of the busbar is realized, the defects of products in process can be identified on line, and the flow of unqualified products is avoided.

Description

Welding quality control method for square module bus
Technical Field
The invention belongs to the technical field of new energy automobile bus bar welding, and particularly relates to a welding quality control method for a square module bus bar.
Background
Through analyzing the quality assurance capability of the conventional module production line bus bar welding process, the following problems are found to exist:
1. the traditional method detects the position degree of a single pole column, compensates the subsequent welding position, does not judge the distribution uniformity of the electric core, easily generates internal stress after parts are welded, easily cracks welding spots and influences long-term use.
2. The traditional method only indirectly ensures the welding quality by controlling the welding parameters, cannot carry out welding condition inspection or detection on the welded parts, and cannot directly judge the quality of the welding result.
Disclosure of Invention
In order to overcome the problems, the invention provides a welding quality control method of a square module busbar, which comprises the steps of detecting the position deviation of a battery cell pole before welding, controlling parameters in the welding process, detecting the welding depth by 100% on line, and visually detecting the appearance of a welded seam after welding, thereby realizing the effective control of the welding quality of the busbar, identifying the defects of products in process on line and avoiding the outflow of unqualified products.
A welding quality control method for a square module bus comprises the following steps:
step one, photographing each battery cell pole in the module stacking assembly, calculating the position degree deviation of each battery cell pole relative to the theoretical model according to the photograph, entering the next procedure by the module stacking assembly with the deviation within the allowable range, and taking the module stacking assembly with the deviation not within the allowable range to be NG off-line;
step two, installing the bus bar into the module stacking assembly to obtain a product;
thirdly, enabling the product to enter a welding workstation along with the tray, and enabling a welding and pressing tool to press the busbar so as to ensure that the busbar is attached to the battery cell pole in the module stacking assembly;
step four, controlling welding parameters, welding the busbar on the electric core pole, measuring a penetration value of a welding position by each welding point through online penetration detection equipment, and stopping welding if the penetration value is out of tolerance; if the penetration value is not out of tolerance, binding welding parameters in welding with a module serial number of the module stacking assembly and uploading the welding parameters to an MES system;
and step five, after welding is finished, photographing the welding line by using a CCD camera, checking the appearance of the welding line, binding the photo and the welding line appearance checking result with the module serial number of the module stacking assembly, and uploading the result to an MES system.
In the first step, each battery cell pole in the module stacking assembly is photographed by a CCD camera, and then the position degree deviation of each battery cell pole relative to a theoretical model of the battery cell pole is calculated, wherein the deviation allowable range is obtained by comprehensively evaluating in a product design stage and an equipment manufacturing stage.
In the first step, in order to ensure the accuracy of the CCD camera in the using process, the CCD camera needs to be calibrated periodically.
The CCD camera is selected according to the requirement of deviation precision detection.
And the welding parameters in the fourth step comprise power, defocusing amount, welding speed and penetration value.
The size of the pressure head of the welding tool in the fourth step can be matched with the size and position degree deviation of the electrode column of the electric core.
The invention has the beneficial effects that:
according to the method, the position degree of the pole of the battery core is evaluated from the overall appearance, the phenomenon that the battery core is unevenly distributed due to the size and the elasticity of the internal parts of the stacked module is found in time, the internal stress caused by deformation after trying to use is avoided, and the welding spot welding influence is eliminated.
The method has the advantages that the welding effect is directly judged through the online penetration detection, the machine is stopped when a problem is found, the generation of batch unqualified products is avoided, the waste is eliminated, and the processing cost is saved.
The quality control data of the method is uploaded to an MES system, and the full life cycle traceability is formed.
In conclusion, compared with the traditional method, the method solves the technical problems that the distribution position uniformity of the polar columns before the welding of the bus of the traditional module production line cannot be judged and the welding quality cannot be directly evaluated on line; the method realizes high-efficiency online detection and 100% quality control in the welding process of the products, and is practically applied to a steam module production line.
Detailed Description
The present invention will be described in further detail with reference to examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used for convenience of description and simplicity of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example 1
A method for controlling the welding quality of a bus bar of a square module,
step one, photographing each battery cell pole in the module stacking assembly, calculating the position degree deviation of each battery cell pole relative to the theoretical model according to the photograph, entering the next procedure by the module stacking assembly with the deviation within the allowable range, and taking the module stacking assembly with the deviation not within the allowable range to be NG off-line;
step two, installing the bus bar into the module stacking assembly to obtain a product;
thirdly, enabling the product to enter a welding workstation along with the tray, and enabling a welding and pressing tool to press the busbar so as to ensure that the busbar is attached to the battery cell pole in the module stacking assembly;
step four, controlling welding parameters, welding the busbar on the electric core pole, measuring a penetration value of a welding position by online penetration detection equipment for each welding spot, stopping welding if the penetration value is out of tolerance, and stopping the equipment to alarm; if the penetration value is not out of tolerance, binding key welding parameters in welding with a module serial number of the module stacking assembly and uploading the key welding parameters to an MES system;
and step five, after welding is finished, photographing the welding line by using a CCD camera, checking the appearance of the welding line, binding the photo and the welding line appearance checking result with the module serial number of the module stacking assembly, and uploading the result to an MES system.
In the first step, each battery cell pole in the module stacking assembly is photographed by a CCD camera, and then the position degree deviation of each battery cell pole relative to a theoretical model of the battery cell pole is calculated, wherein the deviation allowable range is obtained by comprehensively evaluating in a product design stage and an equipment manufacturing stage.
In the first step, in order to ensure the accuracy of the CCD camera in the using process, a calibration tool needs to be manufactured to calibrate the CCD camera periodically.
The CCD camera is selected according to the requirement of deviation precision detection, and when the CCD camera is used, a tool needs to be regularly used to confirm the camera detection function, so that the deviation is found and the calibration is carried out in time.
And the welding parameters in the fourth step comprise power, defocusing amount, welding speed and penetration value.
The size of a pressure head of the welding tool in the fourth step can be matched with the size and position degree deviation of the electrode column of the electric core, and the position of a welding spot is not independently corrected.
The online penetration detection equipment adopts equipment with a Lemsemler brand and a 130200 model.
Example 2
The new process mentioned in the present invention is as follows:
1. and photographing each battery cell pole in the module stacking assembly, calculating the position deviation of each battery cell relative to the theoretical model of the battery cell, comprehensively evaluating the deviation allowable range in a product design stage and an equipment manufacturing stage, and entering the next procedure for photographing and identifying the qualified stacking assembly, or else, taking the NG of the qualified stacking assembly off the line. In order to ensure the accuracy of the CCD vision system in the using process, a calibration tool is manufactured and used for periodically calibrating the vision system.
2. Mounting bus bar
3. The work in progress (the module of having installed the busbar piles up the assembly) and gets into weldment work station along with the tray, and the welding compresses tightly the frock and compresses tightly the busbar, ensures that busbar and electric core utmost point post laminate
4. And (3) welding a bus bar, controlling welding parameters by equipment, measuring a welding position penetration value of the welding position by online penetration detection equipment in real time by 100%, and stopping the equipment for alarming if the penetration value is out of tolerance. And key parameters (power, defocusing amount, welding speed, penetration value and the like) in welding are bound with the module flow number and uploaded to the MES system.
5. And (4) after welding is finished, the CCD camera checks the appearance of the welding seam, and the photos and the results are bound with the module serial number and uploaded to an MES system.
According to the method, the position degree of the pole of the battery core is evaluated from the overall appearance, the phenomenon that the battery core is unevenly distributed due to the size and the elasticity of the internal parts of the stacked module is found in time, the internal stress caused by deformation after trying to use is avoided, and the welding spot welding influence is eliminated.
The method has the advantages that the welding effect is directly judged through the online penetration detection, the machine is stopped when a problem is found, the generation of batch unqualified products is avoided, the waste is eliminated, and the processing cost is saved.
The quality control data of the method is uploaded to an MES system, and the full life cycle traceability is formed.
Although the preferred embodiments of the present invention have been described in detail, the scope of the present invention is not limited to the details of the foregoing embodiments, and any simple modifications within the technical scope of the present invention and the technical solutions and inventive concepts thereof disclosed by the present invention may be equally replaced or changed by those skilled in the art within the technical scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (6)

1. A welding quality control method for a square module bus is characterized by comprising the following steps:
step one, photographing each battery cell pole in the module stacking assembly, calculating the position degree deviation of each battery cell pole relative to the theoretical model according to the photograph, entering the next procedure by the module stacking assembly with the deviation within the allowable range, and taking the module stacking assembly with the deviation not within the allowable range to be NG off-line;
step two, installing the bus bar into the module stacking assembly to obtain a product;
thirdly, enabling the product to enter a welding workstation along with the tray, and enabling a welding and pressing tool to press the busbar so as to ensure that the busbar is attached to the battery cell pole in the module stacking assembly;
step four, controlling welding parameters, welding the busbar on the electric core pole, measuring a penetration value of a welding position by each welding point through online penetration detection equipment, and stopping welding if the penetration value is out of tolerance; if the penetration value is not out of tolerance, binding welding parameters in welding with a module serial number of the module stacking assembly and uploading the parameters to an MES system;
and step five, after welding is finished, photographing the welding line by using a CCD camera, checking the appearance of the welding line, binding the photo and the welding line appearance checking result with the module serial number of the module stacking assembly, and uploading the result to an MES system.
2. The method according to claim 1, wherein in the first step, a CCD camera is used to photograph each cell post in the module stacking assembly, and then a deviation of the position of each cell post relative to a theoretical model thereof is calculated, wherein the deviation tolerance is obtained by comprehensive evaluation in a product design stage and an equipment manufacturing stage.
3. The method as claimed in claim 1, wherein the first step requires regular calibration of the CCD camera to ensure the accuracy of the CCD camera during use.
4. The method as claimed in claim 1, wherein the CCD camera is selected according to the requirement of deviation accuracy detection.
5. The method as claimed in claim 1, wherein the welding parameters in the fourth step include power, defocus, welding speed, and penetration.
6. The method as claimed in claim 1, wherein the size of the pressure head of the welding tool in the fourth step is matched with the size and position deviation of the electrode core pole.
CN202210347469.7A 2022-04-01 2022-04-01 Welding quality control method for square module bus Pending CN114799594A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Publication Number Publication Date
CN114799594A true CN114799594A (en) 2022-07-29

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH115174A (en) * 1997-06-12 1999-01-12 Yazaki Corp Quality checking method of resistance welding
CN1411944A (en) * 2002-11-22 2003-04-23 铁道部电气化工程局宝鸡器材厂 Manifold welding process
CN107855687A (en) * 2017-10-17 2018-03-30 华中科技大学鄂州工业技术研究院 A kind of increasing material manufacturing fusion penetration on-line checking and control method and system
CN109585935A (en) * 2018-11-28 2019-04-05 江西安驰新能源科技有限公司 A kind of packaging technology of lithium battery mould group
CN111638127A (en) * 2020-06-01 2020-09-08 江西优特汽车技术有限公司 Method for detecting welding reliability of soft-packaged battery cell tab

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH115174A (en) * 1997-06-12 1999-01-12 Yazaki Corp Quality checking method of resistance welding
CN1411944A (en) * 2002-11-22 2003-04-23 铁道部电气化工程局宝鸡器材厂 Manifold welding process
CN107855687A (en) * 2017-10-17 2018-03-30 华中科技大学鄂州工业技术研究院 A kind of increasing material manufacturing fusion penetration on-line checking and control method and system
CN109585935A (en) * 2018-11-28 2019-04-05 江西安驰新能源科技有限公司 A kind of packaging technology of lithium battery mould group
CN111638127A (en) * 2020-06-01 2020-09-08 江西优特汽车技术有限公司 Method for detecting welding reliability of soft-packaged battery cell tab

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