CN114184971B - Method for accurately detecting short-circuit battery cells after lamination of lithium ion battery - Google Patents
Method for accurately detecting short-circuit battery cells after lamination of lithium ion battery Download PDFInfo
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- CN114184971B CN114184971B CN202210123136.6A CN202210123136A CN114184971B CN 114184971 B CN114184971 B CN 114184971B CN 202210123136 A CN202210123136 A CN 202210123136A CN 114184971 B CN114184971 B CN 114184971B
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- 238000003475 lamination Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 36
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 26
- 238000012360 testing method Methods 0.000 claims abstract description 32
- 238000012216 screening Methods 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 abstract description 16
- 230000008439 repair process Effects 0.000 abstract description 7
- 238000012797 qualification Methods 0.000 abstract description 5
- 208000002874 Acne Vulgaris Diseases 0.000 description 22
- 206010000496 acne Diseases 0.000 description 22
- 230000008569 process Effects 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000007306 turnover Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical class [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 208000020154 Acnes Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- 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
-
- 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
Abstract
The invention discloses a method for accurately detecting a short-circuit cell after lamination of a lithium ion battery, which comprises the following steps: placing the laminated battery cells on an electromagnetic vibration tester for low-frequency up-down vibration, then enabling the battery cells to vibrate left and right at low frequency, performing short circuit test on the battery cells subjected to low-frequency vibration treatment, and primarily screening out some short circuit battery cells; performing high-frequency up-and-down vibration on the qualified battery cell, and then performing high-frequency left-and-right vibration on the battery cell; the invention has the advantages that fine burrs which possibly cause hidden danger of short circuit on the battery cell pole pieces, and powder and fine vermicelli which are about to fall off are advanced to cause sharp short circuit points, the hidden short circuit battery cells are exposed in time, the short circuit battery cells are efficiently and accurately screened out, the repair cost of the short circuit battery cells is reduced, the repair difficulty of the short circuit battery cells is reduced, and the qualification rate of the battery is improved.
Description
Technical Field
The invention relates to the technical field of battery cell short circuit detection, in particular to a method for accurately detecting a short-circuit battery cell after lamination of a lithium ion battery.
Background
The lithium ion secondary battery is widely used in the high-tech fields of modern communication, space technology, information technology, national defense and the like by virtue of high energy density, low self-discharge rate and high voltage, and is a promising new energy source; with the further development of science and technology, the energy problem and the environmental problem are increasingly outstanding, people have higher and higher requirements on the lithium ion battery, and in the whole manufacturing process of the lithium ion battery, short circuit test is needed to be carried out in each process, as a first short circuit test process, short circuit test after lamination is particularly important, the existing battery cell is directly subjected to short circuit test after lamination, the battery cell is often placed on a turnover platform for turnover in the turnover process, the battery cell is in a stable state, the powder brushing process before lamination cannot ensure that powder and vermicelli on each pole piece are completely cleaned, the patent publication No. CN102243284A discloses a method for detecting winding type micro-short circuit, the short circuit test is carried out after the battery subjected to high-frequency vibration treatment of formation, volume division and constant current supplement charge treatment, the short circuit detection efficiency is improved, but the short circuit test is carried out on the battery processed into a finished product in a later process, even if the short circuit battery is detected, the repair cost is high, the short circuit battery cell is even caused to be directly, the short circuit battery cell is not found to be in a turnover process, the powder on each pole piece is not completely scraped after the battery cell in the previous process, the short circuit battery cell is not detected, the small and the falling off point is not formed in time, the short circuit points are not damaged when the short circuit points are exposed in the process has high-frequency, the short circuit components are exposed, the short circuit components are produced, the short circuit components have high in the short circuit has high frequency has the problem, and the effect is produced, and the short circuit fault has the short circuit fault condition has been caused, and the short circuit fault conditions.
Disclosure of Invention
The invention aims to overcome the existing defects, and provides a method for accurately detecting a short-circuit cell after lamination of a lithium ion battery, which is used for accurately screening the short-circuit cell in the lamination process through an effective vibration treatment, finding out some tiny burrs on a pole piece and some powder to be dropped and tiny vermicelli temporarily do not form sharp short-circuit points in time, and timely treating the short-circuit cell to prevent the cell with hidden short-circuit points from flowing into the subsequent process, thereby reducing the repair cost of the short-circuit cell and the repair difficulty of the short-circuit cell; through adopting the electric core of different diaphragm thickness to carry out reasonable low frequency vibration or low frequency and high frequency vibration to the lamination and handle, not only vibration effect is good, and vibration treatment efficiency is high, can effectively avoid vibration treatment to lead to the fact the damage to the electric core moreover, reduces the short circuit that the human factor caused the electric core, screens out short circuit electric core high-efficiently and accurately, improves the qualification rate of production battery, can effectively solve the problem among the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a method for accurately detecting a short-circuit cell after lamination of a lithium ion battery comprises the following steps:
s1: placing the battery cell on an electromagnetic vibration tester, performing low-frequency vibration treatment on the battery cell to be detected, firstly, performing low-frequency up-and-down vibration on the battery cell, and then performing low-frequency left-and-right vibration on the battery cell;
s2: the battery cells subjected to the low-frequency vibration treatment are sequentially subjected to short-circuit test by a battery cell short-circuit tester, and the short-circuited battery cells are primarily selected;
when lamination is carried out, adopting a battery cell with the diaphragm thickness smaller than 20 micrometers to only carry out the step S1 and the step S2; when lamination is carried out, adopting a battery cell with the diaphragm thickness of more than or equal to 20 micrometers to continue to carry out the step S3 and the step S4;
s3: placing the qualified battery cell on an electromagnetic vibration tester again, performing high-frequency vibration treatment on the battery cell, firstly enabling the battery cell to vibrate up and down at high frequency, and then enabling the battery cell to vibrate left and right at high frequency;
s4: and (3) sequentially passing the battery cells subjected to high-frequency vibration treatment through a battery cell short circuit tester for short circuit test, and finally screening out qualified battery cells.
Further, the low-frequency vibration frequency is set at 10-20Hz, the amplitude of the low-frequency up-down vibration is 1.0-1.5mm, and the vibration time is 10s; the amplitude of the low-frequency left-right vibration is 0.5-1.0mm, and the vibration time is 5s.
Further, the high-frequency vibration frequency is set at 30-70Hz, the amplitude of the high-frequency up-and-down vibration is 0.5-1.0mm, the vibration time is 5s, the amplitude of the high-frequency left-and-right vibration is 0.5-1.0mm, and the vibration time is 3s.
Compared with the prior art, the invention has the beneficial effects that: according to the method for accurately detecting the short-circuit cell after lamination of the lithium ion battery, the short-circuit cell in the lamination process is accurately screened out through an effective vibration treatment, and a few tiny burrs on a pole piece, a few powder to be dropped and a tiny vermicelli are found out in time, so that sharp short-circuit points are not formed temporarily; through adopting the electric core of different diaphragm thickness to carry out reasonable low frequency vibration or low frequency and high frequency vibration when laminating, not only vibration effect is good, and vibration treatment efficiency is high, can effectively avoid vibration treatment to cause the damage to the electric core moreover, reduces the short circuit that the human factor caused the electric core, screens out short circuit electric core high-efficient accuracy, improves the qualification rate of production battery.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The invention provides a technical scheme that: a method for accurately detecting a short-circuit cell after lamination of a lithium ion battery comprises the following steps:
s1: placing a battery cell with the thickness of 20 micrometers on an electromagnetic vibration tester when laminating, performing low-frequency vibration treatment on the battery cell to be detected, wherein the low-frequency vibration frequency is set at 10Hz, firstly, enabling the battery cell to perform low-frequency up-and-down vibration, wherein the amplitude of the low-frequency up-and-down vibration is 1.0mm, the vibration time is 10s, and then enabling the battery cell to perform low-frequency left-and-right vibration, wherein the amplitude of the low-frequency left-and-right vibration is 0.5mm, and the vibration time is 5s;
s2: the battery cells subjected to the low-frequency vibration treatment are sequentially subjected to short-circuit test by a battery cell short-circuit tester, and the short-circuited battery cells are primarily selected;
s3: placing the qualified battery cell on an electromagnetic vibration tester again, carrying out high-frequency vibration treatment on the battery cell, wherein the high-frequency vibration frequency is set at 30Hz, firstly, enabling the battery cell to vibrate up and down at high frequency, wherein the amplitude of the high-frequency vibration is 0.5mm, the vibration time is 5s, and then enabling the battery cell to vibrate left and right at high frequency, the amplitude of the high-frequency vibration is 0.5mm, and the vibration time is 3s;
s4: and (3) sequentially passing the battery cells subjected to high-frequency vibration treatment through a battery cell short circuit tester for short circuit test, and finally screening out qualified battery cells.
Example two
The invention provides a technical scheme that: a method for accurately detecting a short-circuit cell after lamination of a lithium ion battery comprises the following steps:
s1: placing a battery cell with the diaphragm thickness of 32 micrometers on an electromagnetic vibration tester during lamination, performing low-frequency vibration treatment on the battery cell to be detected, wherein the low-frequency vibration frequency is set at 20Hz, firstly, enabling the battery cell to perform low-frequency up-down vibration, wherein the amplitude of the low-frequency up-down vibration is 1.5mm, the vibration time is 10s, and then enabling the battery cell to perform low-frequency left-right vibration, wherein the amplitude of the low-frequency left-right vibration is 1.0mm, and the vibration time is 5s;
s2: the battery cells subjected to the low-frequency vibration treatment are sequentially subjected to short-circuit test by a battery cell short-circuit tester, and the short-circuited battery cells are primarily selected;
s3: placing the qualified battery cell on an electromagnetic vibration tester again, carrying out high-frequency vibration treatment on the battery cell, wherein the high-frequency vibration frequency is set at 70Hz, firstly, enabling the battery cell to vibrate up and down at high frequency, wherein the amplitude of the high-frequency vibration is 1.0mm, the vibration time is 5s, and then enabling the battery cell to vibrate left and right at high frequency, the amplitude of the high-frequency vibration is 1.0mm, and the vibration time is 3s;
s4: and (3) sequentially passing the battery cells subjected to high-frequency vibration treatment through a battery cell short circuit tester for short circuit test, and finally screening out qualified battery cells.
Example III
The invention provides a technical scheme that: a method for accurately detecting a short-circuit cell after lamination of a lithium ion battery comprises the following steps:
s1: placing a battery cell with a diaphragm thickness of 25 micrometers on an electromagnetic vibration tester during lamination, performing low-frequency vibration treatment on the battery cell to be detected, wherein the low-frequency vibration frequency is set at 15Hz, firstly, enabling the battery cell to perform low-frequency up-down vibration, wherein the amplitude of the low-frequency up-down vibration is 1.2mm, the vibration time is 10s, and then enabling the battery cell to perform low-frequency left-right vibration, wherein the amplitude of the low-frequency left-right vibration is 0.7mm, and the vibration time is 5s;
s2: the battery cells subjected to the low-frequency vibration treatment are sequentially subjected to short-circuit test by a battery cell short-circuit tester, and the short-circuited battery cells are primarily selected;
s3: placing the qualified battery cell on an electromagnetic vibration tester again, carrying out high-frequency vibration treatment on the battery cell, wherein the high-frequency vibration frequency is set at 60Hz, firstly, enabling the battery cell to vibrate up and down at high frequency, wherein the amplitude of the high-frequency vibration is 0.7mm, the vibration time is 5s, and then enabling the battery cell to vibrate left and right at high frequency, the amplitude of the high-frequency vibration is 0.7mm, and the vibration time is 3s;
s4: and (3) sequentially passing the battery cells subjected to high-frequency vibration treatment through a battery cell short circuit tester for short circuit test, and finally screening out qualified battery cells.
Comparative example one: taking 100 battery cores of the EV 10173248-20AH type of the laminated soft-package lithium ion battery, wherein the thickness of a diaphragm of the battery core is 25 micrometers, and only adopting low-frequency vibration treatment: the method comprises the steps of performing low-frequency vibration treatment on a battery cell, wherein the low-frequency vibration frequency is set at 20Hz, firstly, enabling the battery cell to perform low-frequency up-down vibration, wherein the amplitude of the low-frequency up-down vibration is 1.5mm, the vibration time is 10s, and then enabling the battery cell to perform low-frequency left-right vibration, wherein the amplitude of the low-frequency left-right vibration is 1.0mm, and the vibration time is 5s; the battery cells subjected to the low-frequency vibration treatment are subjected to short circuit test sequentially through a battery short circuit tester, and then the battery cells are all disassembled and analyzed;
comparative example two: taking 100 battery cores of the EV 10173248-20AH type of the laminated soft-package lithium ion battery, wherein the thickness of a diaphragm of the battery core is 32 micrometers, and only adopting high-frequency vibration treatment: the method comprises the steps of performing high-frequency vibration treatment on a battery cell, wherein the high-frequency vibration frequency is set at 90Hz, the battery cell is firstly subjected to high-frequency up-down vibration, the amplitude of the high-frequency up-down vibration is 0.6mm, the vibration time is 5s, and then the battery cell is subjected to high-frequency left-right vibration, the amplitude of the high-frequency left-right vibration is 0.6mm, and the vibration time is 3s; the battery cells subjected to high-frequency vibration treatment are subjected to short circuit test sequentially through a battery short circuit tester, and then the battery cells are all disassembled and analyzed;
comparative example three: taking 100 battery cores of the EV 10173248-20AH type of the laminated soft-package lithium ion battery, wherein the thickness of a diaphragm of the battery core is 25 micrometers, and only adopting high-frequency vibration treatment: carrying out high-frequency vibration treatment on the battery cell, wherein the high-frequency vibration frequency is set at 70Hz, firstly, enabling the battery cell to carry out high-frequency up-and-down vibration, wherein the amplitude of the high-frequency up-and-down vibration is 1.0mm, the vibration time is 10s, and then enabling the battery cell to carry out high-frequency left-and-right vibration, the amplitude of the high-frequency left-and-right vibration is 1.0mm, and the vibration time is 5s; the battery cells subjected to high-frequency vibration treatment are subjected to short circuit test sequentially through a battery short circuit tester, and then the battery cells are all disassembled and analyzed;
and (3) test verification: taking 100 battery cores of the EV 10173248-20AH type of the laminated lithium iron soft package lithium ion batteries, respectively carrying out short circuit test after vibration treatment in the first embodiment, the second embodiment and the third embodiment, and then completely disassembling and analyzing the battery cores;
the test data are as follows:
| normally existing acne-causing shortness Road | The pole piece powder is seriously fallen off due to vibration A kind of electronic device | The pole piece powder is seriously fallen off due to vibration Short circuit | Outer layer diaphragm pleat Wrinkling (wrinkle) | Residual acne still has hidden trouble of short circuit A kind of electronic device | |
| Examples A first part | 3 | 0 | 0 | 0 | 0 |
| Examples Two (II) | 3 | 0 | 0 | 0 | 0 |
| Examples Three kinds of | 4 | 0 | 0 | 0 | 0 |
| Comparative example A first part | 1 | 0 | 0 | 0 | 2 |
| Comparative example Two (II) | 3 | 10 | 3 | 10 | 0 |
| Comparative example Three kinds of | 3 | 0 | 0 | 3 | 1 |
From the table above, it can be seen that:
in the embodiment, a pair of battery cells with the diaphragm thickness of 20 micrometers are adopted for lamination, firstly, low-frequency vibration treatment is carried out, the low-frequency vibration frequency is set at 10Hz, then, high-frequency vibration treatment is carried out on the battery cells which are qualified through short circuit detection again, the high-frequency vibration frequency is set at 30Hz, after the vibration treatment, the battery cells which are short-circuited due to acne which normally exists on a battery cell pole piece can be effectively screened out, the battery cells with the acne residues are avoided, and the conditions that the battery cell pole piece pole powder is seriously dropped and the diaphragm of the outer layer of the battery cell is wrinkled due to the vibration treatment are avoided;
in the second embodiment, the battery cells with the diaphragm thickness of 32 micrometers are subjected to low-frequency vibration treatment firstly, the low-frequency vibration frequency is set at 20Hz, then the battery cells qualified in short-circuit detection are subjected to high-frequency vibration treatment again, the high-frequency vibration frequency is set at 70Hz, after the vibration treatment, the battery cells which are short-circuited due to acne normally existing on the battery cell pole pieces can be effectively screened out, the battery cells with the acne residues are avoided, and the conditions that the battery cell pole piece pole powder is seriously dropped and the diaphragm of the outer layer of the battery cell is wrinkled due to the vibration treatment are avoided;
the battery core with the diaphragm thickness of 25 micrometers is adopted for the lamination of the comparison example, only low-frequency vibration treatment is carried out, the low-frequency vibration frequency is set at 20Hz, after the vibration treatment, the battery core which is short-circuited due to acne normally existing on a battery core pole piece can be screened, but the battery core which is not sufficiently screened and still has residual acne can not have good vibration effect, and some acnes still have hidden danger of short circuit in the later working procedure;
in the second pair of lamination of the comparative example, the battery cell with the thickness of the diaphragm of 32 micrometers is only subjected to high-frequency vibration treatment, the high-frequency vibration frequency is 90Hz, and after the vibration treatment, the battery cell which is short-circuited due to acne normally existing on the battery cell pole piece can be screened, and the battery cell with no acne residue can be screened, but the conditions of serious falling of the battery cell pole piece pole powder and the outer layer diaphragm fold of the battery cell due to the vibration treatment are caused due to the overhigh vibration frequency, so that the battery performance and the battery appearance are affected;
in the third pair of lamination, the battery core with the thickness of the diaphragm of 25 micrometers is only subjected to high-frequency vibration treatment, the high-frequency vibration frequency is 70Hz, and after the vibration treatment, the battery core which is short-circuited due to acne normally existing on a battery core pole piece can be screened, but the battery core which is insufficient in screening and still has residual acne is screened, while the battery core which is only subjected to high-frequency vibration treatment, the smaller acne is insufficient in vibration, so that the acne which is not subjected to effective vibration treatment still exists, a good vibration effect is not achieved, short-circuit hidden danger still exists in the later working procedure, and the condition that the diaphragm of the outer layer of the battery core is wrinkled due to long-time high-frequency vibration treatment is caused, so that the battery performance and the battery appearance are affected;
according to the method for detecting the short-circuit cell after the lithium ion battery lamination, firstly, short-time low-frequency vibration treatment is carried out on the cell with the diaphragm thickness being more than or equal to 20 microns, fine burrs possibly causing hidden short-circuit hazards and powder to be dropped off are enabled to be in front of sharp short-circuit points, so that the hidden-hidden short-circuit cell is exposed in time, the short-circuit cell is initially selected after the primary cell short-circuit test, short-time high-frequency vibration treatment is carried out on the cell after lamination, the vibration effect of the cell is improved, the hidden-hidden short-circuit cell is further exposed in time, then short-circuit test is carried out through a secondary cell short-circuit tester, the short-circuit cell is processed in time, the short-circuit cell repairing cost is reduced, and the short-circuit cell repairing difficulty is reduced; through adopting the diaphragm thickness to be greater than or equal to 20 microns's electric core to carry out the low frequency vibration of longer time and the high frequency vibration of shorter time when laminating, can effectively avoid long-time high frequency vibration to cause the damage to the electric core, thereby reduce the short circuit that the human factor caused the electric core, also can effectively avoid short time high frequency vibration to reach vibration effect, prevent to have the electric core of hiding the short circuit point to flow into at subsequent handling, through carrying out the low frequency vibration of longer time and the high frequency vibration of shorter time with the electric core after the lamination, vibration effect is good, vibration treatment efficiency is high, high-efficient screening out the short circuit electric core accurately, the qualification rate of production battery improves.
Example IV
The invention provides a technical scheme that: a method for accurately detecting a short-circuit cell after lamination of a lithium ion battery comprises the following steps:
s1: placing a battery cell with a membrane thickness of 16 micrometers on an electromagnetic vibration tester during lamination, performing low-frequency vibration treatment on the battery cell to be detected, wherein the low-frequency vibration frequency is set at 10Hz, firstly, enabling the battery cell to perform low-frequency up-and-down vibration, wherein the amplitude of the low-frequency up-and-down vibration is 1.0mm, the vibration time is 10s, and then enabling the battery cell to perform low-frequency left-and-right vibration, wherein the amplitude of the low-frequency left-and-right vibration is 0.7mm, and the vibration time is 5s;
s2: and the battery cells subjected to the low-frequency vibration treatment sequentially pass through a battery cell short circuit tester to carry out short circuit test, and the short-circuited battery cells are selected.
Example five
The invention provides a technical scheme that: a method for accurately detecting a short-circuit cell after lamination of a lithium ion battery comprises the following steps:
s1: placing a battery cell with a diaphragm thickness of 18 micrometers on an electromagnetic vibration tester during lamination, and performing low-frequency vibration treatment on the battery cell to be detected, wherein the low-frequency vibration frequency is set at 20Hz, the battery cell is firstly subjected to low-frequency up-down vibration, the amplitude of the low-frequency up-down vibration is 1.5mm, the vibration time is 10s, and then the battery cell is subjected to low-frequency left-right vibration, the amplitude of the low-frequency left-right vibration is 1.0mm, and the vibration time is 5s;
s2: and sequentially passing the battery cells subjected to the low-frequency vibration treatment through a battery cell short circuit tester to carry out short circuit test, and selecting out the short-circuited battery cells.
Comparative example four: taking 100 battery cores of the EV 70108148-10AH type of the laminated soft-package lithium ion battery, wherein the thickness of a diaphragm of the battery core is 18 micrometers, and adopting high-frequency vibration treatment: carrying out high-frequency vibration treatment on the battery cell, wherein the high-frequency vibration frequency is set at 35Hz, firstly, enabling the battery cell to carry out high-frequency up-and-down vibration, wherein the amplitude of the high-frequency up-and-down vibration is 1.0mm, the vibration time is 5s, and then enabling the battery cell to carry out high-frequency left-and-right vibration, the amplitude of the high-frequency left-and-right vibration is 1.0mm, and the vibration time is 3s; the battery cells subjected to high-frequency vibration treatment are subjected to short circuit test sequentially through a battery short circuit tester, and then the battery cells are all disassembled and analyzed;
and (3) test verification: taking 100 battery cores of the EV 10173248-20AH type of the laminated lithium iron soft package lithium ion batteries, respectively carrying out short circuit test after vibration treatment in the fourth embodiment and the fifth embodiment, and then completely disassembling and analyzing the battery cores;
the test data are as follows:
| normally existing acne-causing shortness Road | The pole piece powder is seriously fallen off due to vibration A kind of electronic device | The pole piece powder is seriously fallen off due to vibration Short circuit | Outer layer diaphragm pleat Wrinkling (wrinkle) | Residual acne still has hidden trouble of short circuit A kind of electronic device | |
| Examples Fourth, fourth | 2 | 0 | 0 | 0 | 0 |
| Examples Five kinds of | 3 | 0 | 0 | 0 | 0 |
| Comparative example Fourth, fourth | 3 | 6 | 2 | 8 | 0 |
From the table above, it can be seen that:
in the fourth embodiment, the battery cells with the membrane thickness of 16 micrometers are adopted for low-frequency vibration treatment, the low-frequency vibration frequency is set at 10Hz, and after the vibration treatment, the battery cells which are short-circuited due to acne normally existing on the battery cell pole pieces can be effectively screened out, the battery cells with the acne residues are avoided, and the conditions that the battery cell pole pieces are seriously broken and the membrane at the outer layer of the battery cells is wrinkled due to the vibration treatment are avoided;
in the fifth embodiment, the battery cells with 18 micrometers of diaphragm thickness are adopted for low-frequency treatment, the low-frequency vibration frequency is set at 20Hz, and after the vibration treatment, the battery cells which are short-circuited due to acne normally existing on the battery cell pole pieces can be effectively screened out, the battery cells with no acne residues are avoided, and the conditions that the battery cell pole pieces are seriously dropped and the diaphragm at the outer layer of the battery cells is wrinkled due to the vibration treatment are avoided;
in the fourth pair of lamination, the battery cells with 18 micrometers of diaphragm thickness are subjected to high-frequency treatment, the high vibration frequency is set at 35Hz, and after the vibration treatment, the battery cells which are short-circuited due to acne normally existing on the battery cell pole pieces can be screened, and the battery cells with no residual acne are not produced, but due to the fact that the vibration frequency is too high, the conditions that the battery cell pole piece pole powder is seriously fallen off and the diaphragm at the outer layer of the battery cells is wrinkled due to high-frequency vibration exist, so that the battery performance and the battery appearance are affected;
by adopting the method for detecting the short-circuit cells after the lithium ion battery lamination, the short-time low-frequency vibration treatment is carried out on the cells with the diaphragm thickness smaller than 20 microns, so that tiny burrs possibly causing hidden short-circuit hazards and powder and tiny vermicelli to be dropped are advanced to cause sharp short-circuit points, the hidden short-circuit cells are exposed in time, the short-circuit cells are selected after the short-circuit test of the cells, the short-circuit cells are accurately screened, the cells with hidden short-circuit points are prevented from flowing into subsequent procedures, the short-circuit cells are treated in time, the repair cost of the short-circuit cells is reduced, and the repair difficulty of the short-circuit cells is reduced; and only the battery cell with the diaphragm thickness smaller than 20 microns is subjected to low-frequency treatment when laminated, so that the diaphragm of the battery cell is prevented from being damaged by high-frequency vibration, the short circuit caused by human factors to the battery cell is reduced, and the qualification rate of the battery is improved.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The method for accurately detecting the short-circuit cell after lamination of the lithium ion battery is characterized by comprising the following steps of:
s1: placing the battery cell on an electromagnetic vibration tester, performing low-frequency vibration treatment on the battery cell to be detected, firstly, performing low-frequency up-and-down vibration on the battery cell, and then performing low-frequency left-and-right vibration on the battery cell;
s2: the battery cells subjected to the low-frequency vibration treatment are sequentially subjected to short-circuit test by a battery cell short-circuit tester, and the short-circuited battery cells are primarily selected;
when lamination is carried out, adopting a battery cell with the diaphragm thickness smaller than 20 micrometers to only carry out the step S1 and the step S2; when lamination is carried out, adopting a battery cell with the diaphragm thickness of more than or equal to 20 micrometers to continue to carry out the step S3 and the step S4;
s3: placing the qualified battery cell on an electromagnetic vibration tester again, performing high-frequency vibration treatment on the battery cell, firstly enabling the battery cell to vibrate up and down at high frequency, and then enabling the battery cell to vibrate left and right at high frequency;
s4: and (3) sequentially passing the battery cells subjected to high-frequency vibration treatment through a battery cell short circuit tester for short circuit test, and finally screening out qualified battery cells.
2. The method for accurately detecting the short-circuit cells after lamination of the lithium ion battery according to claim 1, wherein the method comprises the following steps: the low-frequency vibration frequency is set at 10-20Hz, the amplitude of the low-frequency up-down vibration is 1.0-1.5mm, and the vibration time is 10s; the amplitude of the low-frequency left-right vibration is 0.5-1.0mm, and the vibration time is 5s.
3. The method for accurately detecting the short-circuit cells after lamination of the lithium ion battery according to claim 1, wherein the method comprises the following steps: the high-frequency vibration frequency is set at 30-70Hz, the amplitude of the high-frequency up-and-down vibration is 0.5-1.0mm, the vibration time is 5s, the amplitude of the high-frequency left-and-right vibration is 0.5-1.0mm, and the vibration time is 3s.
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| JP2004039577A (en) * | 2002-07-08 | 2004-02-05 | Nissan Motor Co Ltd | Thin battery, battery pack, compound battery pack, and vehicle |
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