CN111584941A - Method for testing welding effect of battery tab - Google Patents
Method for testing welding effect of battery tab Download PDFInfo
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- CN111584941A CN111584941A CN202010457189.2A CN202010457189A CN111584941A CN 111584941 A CN111584941 A CN 111584941A CN 202010457189 A CN202010457189 A CN 202010457189A CN 111584941 A CN111584941 A CN 111584941A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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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Abstract
The application provides a method for testing the welding effect of a battery tab, which comprises the following steps: processing the pole piece with unqualified quality and complete pole lug into a first battery cell, and marking the first battery cell; processing the pole piece with qualified quality into a second electric core; carrying out tab welding on the first battery cell and the second battery cell by adopting the same process; and selecting the first battery cell to perform welding effect testing. The application discloses battery tab welding effect test method uses the unqualified pole piece of quality but the complete pole ear in the anterior segment technology of tab welding to prepare into first electric core, utilizes first electric core comes as the sample of welding effect spot check test, can reduce the waste to qualified electric core of quality, and first electric core also can recycle.
Description
Technical Field
The application relates to the technical field of lithium batteries, in particular to a method for testing the welding effect of a battery tab.
Background
In recent years, with the increasing exhaustion of world petroleum resources, the development trend of new energy automobiles to replace traditional automobiles becomes inevitable. The performance and safety of the power lithium battery as the heart of the new energy automobile are more important. The tabs in the lithium ion battery are generally connected by ultrasonic welding, and the welding firmness is one of the main factors influencing the service life and the performance of the lithium ion battery.
The general methods for inspecting the welding effect of the tabs are destructive, and the detected battery cores are scrapped, so that great waste is caused.
Therefore, it is necessary to develop a method for testing the welding effect of the battery tab to reduce the cell waste caused by the detection.
Disclosure of Invention
The application provides a method for testing the welding effect of a battery tab, which can reduce the waste of a battery core caused by detection.
One aspect of the present application provides a method for testing a battery tab welding effect, including: processing the pole piece with unqualified quality and complete pole lug into a first battery cell, and marking the first battery cell; processing the pole piece with qualified quality into a second electric core; carrying out tab welding on the first battery cell and the second battery cell by adopting the same process; and selecting the first battery cell to perform welding effect testing.
In some embodiments of the present application, the pole pieces that are of unacceptable quality but have intact tabs are selected from the group consisting of slitting and lamination processes.
In some embodiments of the present application, the quality failure comprises a failure in a pole piece dimension or a failure in a pole piece shape.
In some embodiments of the present application, the pole pieces of the first battery cell and the second battery cell during the welding effect spot check test belong to the same batch of products.
In some embodiments of the present application, the processing conditions for processing the pole pieces with unqualified quality but complete tabs into the first cell are the same as the processing conditions for processing the pole pieces with qualified quality into the second cell.
In some embodiments of the present application, the method of performing tab welding on the first cell and the second cell by using the same process includes ultrasonic welding.
In some embodiments of the application, the selecting of the first battery cell for performing the welding effect test is to select one first battery cell from every 300 to 500 first battery cells and every 500 second battery cells for performing the tab welding for performing the welding effect detection.
In some embodiments of the present application, the method of testing the effectiveness of the weld comprises a tensile measurement.
In some embodiments of the present application, a part of the pole piece at the joint of the tab and the pole piece is cut off when testing the welding effect.
In some embodiments of the present application, the length of the portion where the tab and the pole piece are connected is 10 mm to 20 mm.
The application discloses battery tab welding effect test method uses the unqualified pole piece of quality but the complete pole ear in the anterior segment technology of utmost point ear welding to prepare into first electric core, utilizes first electric core comes as the sample of welding effect test, can reduce the waste to qualified electric core of quality, and first electric core also can retrieve and recycle.
Drawings
The following drawings describe in detail exemplary embodiments disclosed in the present application. Wherein like reference numerals represent similar structures throughout the several views of the drawings. Those of ordinary skill in the art will understand that the present embodiments are non-limiting, exemplary embodiments and that the accompanying drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of the present application, as other embodiments may equally fulfill the inventive intent of the present application. It should be understood that the drawings are not to scale. Wherein:
FIG. 1 is a flow chart of a method of making a lithium battery in an embodiment of the present application;
fig. 2 is a flowchart of a method for testing the welding effect of a battery tab according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a battery cell with a welded tab in the method for testing the welding effect of the battery tab according to the embodiment of the present application;
fig. 4 is a schematic structural diagram of a battery cell during testing in the method for testing the welding effect of the battery tab according to the embodiment of the present application.
Detailed Description
The following description is presented to enable any person skilled in the art to make and use the present disclosure, and is provided in the context of a particular application and its requirements. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present application. Thus, the present application is not limited to the embodiments shown, but is to be accorded the widest scope consistent with the claims.
The technical solution of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.
Fig. 1 is a flowchart of a method for manufacturing a lithium battery in an embodiment of the present application.
Referring to fig. 1, the method of manufacturing the lithium battery includes:
and step S110, preparing a pole piece. The preparation process of the electrode plate is a conventional process known to those skilled in the art, for example, the preparation process of the electrode plate may include the steps of preparing an electrode slurry, coating the electrode slurry on an electrode current collector, rolling and compacting the electrode slurry on the electrode current collector to form the electrode plate;
and step S120, cutting the piece. Cutting the pole piece prepared in the step S110 into a plurality of single pole pieces with pole lugs;
and step S130, laminating. The lamination includes a winding method or a stacking method. Stacking the single pole pieces into a battery cell;
and step S140, welding the lugs. And welding the tabs of the stacked pole pieces together.
And step S150, testing the welding effect. And selecting a part of cells from the plurality of cells with the welded lugs, and testing the welding effect of the lugs.
However, the current common methods for inspecting the welding effect of the tab have destructiveness, and the detected battery cells are scrapped, so that great battery cell waste is caused.
In view of the above problems, an embodiment of the present application provides a method for testing a welding effect of a battery tab, referring to fig. 2, where fig. 2 is a flowchart of the method for testing the welding effect of the battery tab according to the embodiment of the present application, and the method for testing the welding effect of the battery tab includes:
step S210, processing the pole pieces with unqualified quality and complete pole lugs into a first battery cell, and marking the first battery cell;
step S220, processing the pole piece with qualified quality into a second electric core;
step S230, carrying out tab welding on the first battery cell and the second battery cell by adopting the same process;
and S240, selecting the first battery cell to perform welding effect test.
The pole pieces with unqualified quality and complete lugs are processed into the first battery cell, the first battery cell is used as a sample for testing the welding effect, waste of the battery cell with qualified quality can be reduced, and the first battery cell can be recycled.
The method for testing the welding effect of the battery tab is described in detail below with reference to the accompanying drawings.
Step S210, processing the pole pieces with unqualified quality and complete pole lugs into a first battery cell, and marking the first battery cell. In the conventional battery preparation process, products with unqualified quality can be selected and directly eliminated or recycled after each section of process is finished, in the method for testing the welding effect of the battery tab, pole pieces with unqualified quality but complete tabs are collected and processed into a first battery cell, and then the first battery cell is utilized to test the welding effect of the tab, so that the products with unqualified quality can be fully utilized.
The first battery cell is marked to ensure that the first battery cell used in the tab welding effect test and the second battery cell to be subjected to the spot check test are from the same batch, so that the variation between the first battery cell and the second battery cell can be reduced. In the battery production process, batteries are not produced one by one, but are produced in one batch, and each complete process from the preparation of the electrode slurry to the formation of the battery may be referred to as "one batch".
The method for marking the first battery cell includes, for example, setting different batches in battery production as batch a, batch B, batch C (which may be analogized according to the alphabetical order or different batches may be distinguished by numbers), and the like, where pole pieces with unqualified quality but complete tabs are collected from batch a, batch B, and batch C and processed into the first battery cell, the first battery cell prepared by using the pole piece in batch a is marked as the first battery cell of batch a, the first battery cell prepared by using the pole piece in batch B is marked as the first battery cell of batch B, and the first battery cell prepared by using the pole piece in batch C is marked as the first battery cell of batch C.
In some embodiments of the present application, the pole pieces with unqualified quality but complete tab can be selected from the cutting process of step S120 and the lamination process of step S130 in fig. 1. If the pole piece in step S110 is selected, the number of steps for processing the pole piece into the first cell is still large, which increases the cost. The steps required for processing the pole pieces into the first battery cell by selecting the cutting process and the laminating process are fewer and simple, and the cost is lower.
In some embodiments of the present application, the quality failure includes a failure in the size or shape of the pole piece, and the failure means that the size or shape of the pole piece does not meet the design size and shape of the battery cell. The first battery cell that the unqualified pole piece of quality processed formed is used for utmost point ear welding effect test, consequently leads to pole piece size and the unqualified pole piece of shape to process into also can test after the first battery cell in cut-parts.
In some embodiments of the present application, the processing conditions for processing the pole pieces with unqualified quality but complete tabs into the first cell are the same as the processing conditions for processing the pole pieces with qualified quality into the second cell. Using the same manufacturing process may reduce the variation between the first and second cells, which refers to the difference between the first and second cells. The first battery cell is used for replacing a second battery cell to carry out tab welding effect testing, and tab welding effects of the first battery cell need to be capable of keeping consistency with tab welding effects of the second battery cell. If the variables of the first battery cell and the second battery cell are too large, for example, the molding modes of the first battery cell and the second battery cell are different (for example, the first battery cell is in a winding type, and the second battery cell is in a laminated type) or the process parameters during molding are different, and these differences may also affect the tab welding effect and the tab welding effect test result, the test result performed on the first battery cell cannot be consistent with the welding effect of the second battery cell.
And step S220, processing the pole piece with qualified quality into a second battery cell. The processing (e.g., slitting and laminating) is conventional as understood by those skilled in the art and will not be described in detail herein.
Step S230, performing tab welding on the first battery cell and the second battery cell by using the same process. And the first battery cell and the second battery cell are subjected to tab welding by adopting the same welding process so as to ensure the consistency of the test result obtained by selecting the first battery cell for the welding effect test and the test result obtained by directly selecting the second battery cell for the welding effect test.
In some embodiments of the present application, the method of performing tab welding on the first cell and the second cell by using the same process includes ultrasonic welding. The technological parameters of the ultrasonic welding comprise: the ultrasonic frequency is 15KHz to 25KHz, and the welding time is 0.2 seconds to 0.4 seconds.
Fig. 3 is a schematic structural diagram of a battery cell with a welded tab in the method for testing the welding effect of the battery tab according to the embodiment of the present application.
Referring to fig. 3, the battery cell 300 includes a tab 310 and a pole piece 320. The battery cell 300 is formed by stacking a plurality of pole pieces 320, each pole piece 320 includes a tab 310, and a plurality of the tabs 310 are welded together. The battery core is electrically connected with the outside through the lugs, if the lugs are disconnected, the disconnected pole pieces cannot be electrically connected with the outside, and the performance of the battery can be influenced.
And S240, selecting the first battery cell to perform welding effect test. In a conventional battery forming process, for example, in step S150 in fig. 1, a second battery cell is subjected to spot inspection, and conventional methods for inspecting the tab welding effect are destructive, so that the second battery cell after inspection is scrapped, which causes great battery cell waste. In the method for testing the welding effect of the battery tab, the first battery cell and the second battery cell are processed in the same process, the tab welding process is the same, pole pieces forming the first battery cell and the second battery cell are products of the same batch, the first battery cell and the second battery cell are different only in size or shape of the pole pieces, and the size or shape of the pole pieces cannot influence the tab welding effect, so that the welding effect test result of the first battery cell can represent the welding effect of the prime number second battery cell, the first battery cell is directly selected for the welding effect test, the waste of the second battery cell cannot be caused, the pole pieces of the first battery cell are unqualified, the scrapping after the instant detection is irrelevant, and the scrapped first battery cell can be recycled.
In some embodiments of the present application, the pole pieces of the first battery cell and the second battery cell during the welding effect spot check test belong to the same batch of products. The first battery cell is marked according to the batch of the pole pieces, and in order to reduce the variable of the first battery cell and the second battery cell, the first battery cell in the same batch as the second battery cell to be detected is selected for detection when the welding effect sampling test is carried out.
In some embodiments of the application, the selecting of the first battery cell for performing the welding effect test is to select one first battery cell from every 300 to 500 first battery cells and every 500 second battery cells for performing the tab welding for performing the welding effect detection.
In some embodiments of the present application, the method of testing the effectiveness of the weld comprises a tensile measurement. The Rary measurement method comprises the following steps: and pulling the welded tab by using a tension meter, determining the maximum tension capable of being borne by the welded tab according to the reading on the tension meter, and judging whether the welding effect of the tab is qualified.
In some embodiments of the present application, the minimum tensile force for acceptable tab welding is 50N.
Fig. 4 is a schematic structural diagram of a battery cell during testing in the method for testing the welding effect of the battery tab according to the embodiment of the present application.
Referring to fig. 4, when a tension measuring method is used for testing, a tension meter F is used for pulling the tab in two directions, the maximum tension which can be borne by the welded tab is determined according to the reading on the tension meter, and whether the welding effect of the tab is qualified is judged.
Because the utmost point ear size is less, the tensiometer is inconvenient to clip the utmost point ear, consequently can cut off the partial pole piece of utmost point ear 310 and pole piece 320 junction when testing the welding effect, the tensiometer can clip partly of pole piece is dragged.
In some embodiments of the present application, the length d of the portion where the tab and the pole piece are connected is 10 mm to 20 mm.
The application discloses battery tab welding effect test method uses the unqualified pole piece of quality but the complete pole ear in the anterior segment technology of tab welding to prepare into first electric core, utilizes first electric core comes as the sample of welding effect spot check test, can reduce the waste to qualified electric core of quality, and first electric core also can recycle.
In view of the above, it will be apparent to those skilled in the art upon reading the present application that the foregoing application content may be presented by way of example only, and may not be limiting. Those skilled in the art will appreciate that the present application is intended to cover various reasonable variations, adaptations, and modifications of the embodiments described herein, although not explicitly described herein. Such alterations, modifications, and variations are intended to be within the spirit and scope of the exemplary embodiments of this application.
It is to be understood that the term "and/or" as used herein in this embodiment includes any and all combinations of one or more of the associated listed items. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present.
It will be further understood that the terms "comprises," "comprising," "includes" or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It will be further understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a first element in some embodiments may be termed a second element in other embodiments without departing from the teachings of the present application. The same reference numerals or the same reference characters denote the same elements throughout the specification.
Further, the present specification describes example embodiments with reference to idealized example cross-sectional and/or plan and/or perspective views. Accordingly, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, example embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of exemplary embodiments.
Claims (10)
1. A method for testing the welding effect of a battery tab is characterized by comprising the following steps:
processing the pole piece with unqualified quality and complete pole lug into a first battery cell, and marking the first battery cell;
processing the pole piece with qualified quality into a second electric core;
carrying out tab welding on the first battery cell and the second battery cell by adopting the same process;
and selecting the first battery cell to perform welding effect testing.
2. The method for testing the welding effect of the battery tab as claimed in claim 1, wherein the pole piece with unqualified quality and complete tab is selected from a cutting process and a lamination process.
3. The method for testing the welding effect of the battery tab according to claim 1, wherein the quality failure comprises a failure in the size of the pole piece or a failure in the shape of the pole piece.
4. The method for testing the welding effect of the battery tab of claim 1, wherein the pole pieces of the first battery cell and the second battery cell belong to the same batch of products when the welding effect sampling test is performed.
5. The method for testing the welding effect of the battery tab according to claim 1, wherein the processing conditions for processing the pole piece with unqualified quality and complete tab into the first battery cell are the same as the processing conditions for processing the pole piece with qualified quality into the second battery cell.
6. The method for testing the welding effect of the battery tabs according to claim 1, wherein the method for performing tab welding on the first battery cell and the second battery cell by using the same process comprises ultrasonic welding.
7. The method for testing the welding effect of the battery tabs according to claim 1, wherein the selecting of the first battery cell for the welding effect test is to select one first battery cell from every 300 to 500 first battery cells and every 500 second battery cells for tab welding for the welding effect test.
8. The method for testing the welding effect of the battery tab as set forth in claim 1, wherein the method for testing the welding effect comprises a tension measuring method.
9. The method for testing the welding effect of the battery tab according to claim 7, wherein a part of the pole piece at the joint of the tab and the pole piece is cut off when testing the welding effect.
10. The method for testing the welding effect of the battery tab according to claim 8, wherein the length of the portion where the tab is connected with the pole piece is 10 mm to 20 mm.
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