CN114184971A - Method for accurately detecting short circuit cell after lamination of lithium ion battery - Google Patents
Method for accurately detecting short circuit cell after lamination of lithium ion battery Download PDFInfo
- Publication number
- CN114184971A CN114184971A CN202210123136.6A CN202210123136A CN114184971A CN 114184971 A CN114184971 A CN 114184971A CN 202210123136 A CN202210123136 A CN 202210123136A CN 114184971 A CN114184971 A CN 114184971A
- Authority
- CN
- China
- Prior art keywords
- vibration
- frequency
- battery cell
- battery
- short
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000003475 lamination Methods 0.000 title claims abstract description 46
- 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 24
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 238000012216 screening Methods 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims description 16
- 239000000843 powder Substances 0.000 abstract description 20
- 230000008439 repair process Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000012797 qualification Methods 0.000 abstract description 6
- 208000002874 Acne Vulgaris Diseases 0.000 description 24
- 206010000496 acne Diseases 0.000 description 24
- 230000008569 process Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 7
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect 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
- 238000007599 discharging 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
- 235000012149 noodles Nutrition 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a method for accurately detecting a short-circuit battery cell after lamination of a lithium ion battery, which comprises the following steps: placing the laminated battery cell on an electromagnetic vibration tester for low-frequency up-and-down vibration, then enabling the battery cell to perform low-frequency left-and-right vibration, performing short circuit test on the battery cell subjected to low-frequency vibration treatment, and primarily screening out some short circuit battery cells; carrying out high-frequency up-and-down vibration on the qualified battery cell, and then carrying out high-frequency left-and-right vibration on the battery cell; the invention has the advantages that fine burrs possibly causing short circuit hidden danger on the pole pieces of the battery core, powder to be dropped and fine vermicelli are caused to sharp short circuit points in advance, the short circuit battery core with hidden danger is exposed in time, the short circuit battery core is screened out efficiently and accurately, the repair cost of the short circuit battery core is reduced, the repair difficulty of the short circuit battery core is reduced, and the qualification rate of battery production is improved.
Description
Technical Field
The invention relates to the technical field of cell short circuit detection, in particular to a method for accurately detecting a short circuit cell after lamination of a lithium ion battery.
Background
The lithium ion secondary battery is widely used in high-tech fields such as modern communication, space technology, information technology, national defense and the like due to high energy density, low self-discharge rate and high voltage, and is a promising new energy; with the further development of scientific technology and the increasingly outstanding energy problems and environmental problems, people have higher and higher requirements on lithium ion batteries, in the whole manufacturing process of the lithium ion batteries, short circuit tests are required to be carried out in each process, as a first short circuit test process, the post-lamination short circuit test is particularly important, the conventional battery core is directly subjected to the short circuit test after lamination, the battery core is usually placed on a turnover platform for turnover in the turnover process, the battery core is in a stable state, and the powder brushing process before lamination can not ensure that all powder and powder strips on each pole piece are completely removed, the patent publication No. CN102243284A discloses a method for detecting a winding type micro short circuit, the battery after formation, capacity grading qualification and constant-current compensation charging is subjected to high-frequency vibration treatment and then subjected to the short circuit test, the short circuit detection efficiency is improved, but the short circuit test is carried out on the battery processed into a finished product by the post-process, even if detect out short-circuit battery, it is with high costs to reprocess, reprocess the degree of difficulty big, cause short circuit electric core to scrap directly even, and in time discover some tiny burrs and some powder that will drop on the pole piece after the lamination of preceding process electricity core, tiny bean noodles temporarily do not form sharp-pointed short-circuit point, the stimulation of some electric currents in the charging and discharging process when high-frequency vibration or formation partial volume when the welding of preface process utmost point ear cause these to hide the exposure of short-circuit point, influence the qualification rate scheduling problem of production battery.
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, wherein the short-circuit cell in the lamination process is accurately screened out through effective vibration treatment, some fine burrs on a pole piece, powder to be dropped off and fine powder strips are timely found to temporarily not form sharp short-circuit points, the short-circuit cell is timely treated, the cell with hidden short-circuit points is prevented from flowing into the subsequent process, the repair cost of the short-circuit cell is reduced, and the repair difficulty of the short-circuit cell is reduced; through adopting the electric core of different diaphragm thickness to carry out reasonable low frequency vibration or low frequency and high frequency vibration processing during to the lamination, not only vibration effect is good, and vibration treatment efficiency is high, can effectively avoid vibration treatment to cause the damage to electric core moreover, reduces the short circuit that human factor caused to electric core, and short circuit electricity core is selected to high efficiency accuracy, improves the qualification rate of production battery, can effectively solve the problem in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for accurately detecting a short-circuit battery cell after lamination of a lithium ion battery comprises the following steps:
s1: placing the battery cell on an electromagnetic vibration tester, and carrying out low-frequency vibration processing on the battery cell to be detected, wherein the battery cell is firstly subjected to low-frequency up-and-down vibration, and then is subjected to low-frequency left-and-right vibration;
s2: sequentially passing the battery cell after low-frequency vibration treatment through a battery cell short-circuit tester to perform short-circuit test, and primarily selecting the short-circuited battery cell;
only performing the step S1 and the step S2 by using the battery cell with the diaphragm thickness less than 20 microns during lamination; when lamination is carried out, the battery core with the diaphragm thickness of more than or equal to 20 micrometers is adopted to continue the step S3 and the step S4;
s3: placing the qualified battery cell on the electromagnetic vibration tester again, and carrying out high-frequency vibration treatment on the battery cell, wherein the battery cell is subjected to high-frequency vertical vibration at first and then subjected to high-frequency left-right vibration;
s4: and (4) sequentially passing the battery cell after the high-frequency vibration treatment through a battery cell short circuit tester to perform short circuit test, and finally screening out qualified battery cells.
Further, the low-frequency vibration frequency is set to be 10-20Hz, the amplitude of the low-frequency up-and-down vibration is 1.0-1.5mm, and the vibration time is 10 s; the amplitude of the low-frequency left-right vibration is 0.5-1.0mm, and the vibration time is 5 s.
Further, the high-frequency vibration frequency is set to be 30-70Hz, the amplitude of the high-frequency vertical vibration is 0.5-1.0mm, the vibration time is 5s, the amplitude of the high-frequency horizontal vibration is 0.5-1.0mm, and the vibration time is 3 s.
Compared with the prior art, the invention has the beneficial effects that: according to the method for accurately detecting the short-circuit cell after the lithium ion battery is laminated, the short-circuit cell in the lamination process is accurately screened out through effective vibration treatment, and some fine burrs on a pole piece and some powder and fine vermicelli which are about to fall off are found in time and sharp short-circuit points are not formed temporarily, so that the lamination is the first pass for testing the short-circuit cell, the short-circuit cell can be effectively prevented from flowing into the next process, the short-circuit cell is treated in time, the screened short-circuit cell during lamination can be repaired, the repair cost of the short-circuit cell is reduced, and the repair difficulty of the short-circuit cell is reduced; through adopting the electric core of different diaphragm thickness to carry out reasonable low frequency vibration or low frequency and high frequency vibration during to the lamination, not only vibration effect is good, and vibration treatment efficiency is high, can effectively avoid vibration treatment to cause the damage to electric core moreover, reduces the short circuit that human factor caused to electric core, and short circuit electricity core is selected to high efficiency accuracy, improves the qualification rate of production battery.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The invention provides a technical scheme that: a method for accurately detecting a short-circuit battery cell after lamination of a lithium ion battery comprises the following steps:
s1: placing an electric core with a diaphragm thickness of 20 micrometers on an electromagnetic vibration tester during lamination, performing low-frequency vibration treatment on the electric core to be detected, wherein the low-frequency vibration frequency is set at 10Hz, firstly, performing low-frequency up-and-down vibration on the electric core, the amplitude of the low-frequency up-and-down vibration is 1.0mm, the vibration time is 10s, and then performing low-frequency left-and-right vibration on the electric core, wherein the amplitude of the low-frequency left-and-right vibration is 0.5mm, and the vibration time is 5 s;
s2: sequentially passing the battery cell after low-frequency vibration treatment through a battery cell short-circuit tester to perform short-circuit test, and primarily selecting the short-circuited battery cell;
s3: placing the qualified battery cell on the 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 carrying out high-frequency up-and-down vibration on the battery cell, the amplitude of the high-frequency up-and-down vibration is 0.5mm, and the vibration time is 5s, and then carrying out high-frequency left-and-right vibration on the battery cell, wherein the amplitude of the high-frequency left-and-right vibration is 0.5mm, and the vibration time is 3 s;
s4: and (4) sequentially passing the battery cell after the high-frequency vibration treatment through a battery cell short circuit tester to perform 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 battery cell after lamination of a lithium ion battery comprises the following steps:
s1: placing an electric core with a diaphragm thickness of 32 micrometers on an electromagnetic vibration tester during lamination, performing low-frequency vibration treatment on the electric core to be detected, wherein the low-frequency vibration frequency is set at 20Hz, firstly, performing low-frequency up-and-down vibration on the electric core, the amplitude of the low-frequency up-and-down vibration is 1.5mm, the vibration time is 10s, and then performing low-frequency left-and-right vibration on the electric core, the amplitude of the low-frequency left-and-right vibration is 1.0mm, and the vibration time is 5 s;
s2: sequentially passing the battery cell after low-frequency vibration treatment through a battery cell short-circuit tester to perform short-circuit test, and primarily selecting the short-circuited battery cell;
s3: placing the qualified battery cell on the 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 carrying out high-frequency up-and-down vibration on the battery cell, the amplitude of the high-frequency up-and-down vibration is 1.0mm, and the vibration time is 5s, and then carrying out high-frequency left-and-right vibration on the battery cell, wherein the amplitude of the high-frequency left-and-right vibration is 1.0mm, and the vibration time is 3 s;
s4: and (4) sequentially passing the battery cell after the high-frequency vibration treatment through a battery cell short circuit tester to perform 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 battery cell after lamination of a lithium ion battery comprises the following steps:
s1: placing an electric core with a diaphragm thickness of 25 micrometers on an electromagnetic vibration tester during lamination, performing low-frequency vibration treatment on the electric core to be detected, wherein the low-frequency vibration frequency is set at 15Hz, firstly performing low-frequency up-and-down vibration on the electric core, the amplitude of the low-frequency up-and-down vibration is 1.2mm, the vibration time is 10s, and then performing low-frequency left-and-right vibration on the electric core, the amplitude of the low-frequency left-and-right vibration is 0.7mm, and the vibration time is 5 s;
s2: sequentially passing the battery cell after low-frequency vibration treatment through a battery cell short-circuit tester to perform short-circuit test, and primarily selecting the short-circuited battery cell;
s3: placing the qualified battery cell on the 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 carrying out high-frequency up-and-down vibration on the battery cell, the amplitude of the high-frequency up-and-down vibration is 0.7mm, and the vibration time is 5s, and then carrying out high-frequency left-and-right vibration on the battery cell, wherein the amplitude of the high-frequency left-and-right vibration is 0.7mm, and the vibration time is 3 s;
s4: and (4) sequentially passing the battery cell after the high-frequency vibration treatment through a battery cell short circuit tester to perform short circuit test, and finally screening out qualified battery cells.
Comparative example one: 100 lithium iron soft package lithium ion battery EV 10173248-20AH model electric cores after taking the lamination, battery core's diaphragm thickness is 25 microns, only adopts low frequency vibration to handle: carrying out low-frequency vibration treatment on the battery cell, wherein the low-frequency vibration frequency is set at 20Hz, firstly, carrying out low-frequency up-and-down vibration on the battery cell, the amplitude of the low-frequency up-and-down vibration is 1.5mm, and the vibration time is 10s, and then carrying out low-frequency left-and-right vibration on the battery cell, the amplitude of the low-frequency left-and-right vibration is 1.0mm, and the vibration time is 5 s; sequentially carrying out short circuit test on the battery cell subjected to low-frequency vibration treatment by using a battery short circuit tester, and then completely disassembling and analyzing the battery cell;
comparative example two: 100 lithium iron soft package lithium ion battery EV 10173248-20AH model electric cores after taking the lamination, the diaphragm thickness of battery electric core is 32 microns, only adopts high-frequency vibration to handle: carrying out high-frequency vibration treatment on the battery cell, wherein the high-frequency vibration frequency is set at 90Hz, firstly carrying out high-frequency up-and-down vibration on the battery cell, the amplitude of the high-frequency up-and-down vibration is 0.6mm, and the vibration time is 5s, and then carrying out high-frequency left-and-right vibration on the battery cell, the amplitude of the high-frequency left-and-right vibration is 0.6mm, and the vibration time is 3 s; sequentially carrying out short circuit test on the battery cell subjected to the high-frequency vibration treatment by using a battery short circuit tester, and then completely disassembling and analyzing the battery cell;
comparative example three: 100 lithium iron soft package lithium ion battery EV 10173248-20AH model electric cores after taking the lamination, the diaphragm thickness of battery electric core is 25 microns, only adopts high-frequency vibration to handle: carrying out high-frequency vibration treatment on the battery cell, wherein the high-frequency vibration frequency is set at 70Hz, firstly carrying out high-frequency up-and-down vibration on the battery cell, the amplitude of the high-frequency up-and-down vibration is 1.0mm, and the vibration time is 10s, and then carrying out high-frequency left-and-right vibration on the battery cell, the amplitude of the high-frequency left-and-right vibration is 1.0mm, and the vibration time is 5 s; sequentially carrying out short circuit test on the battery cell subjected to the high-frequency vibration treatment by using a battery short circuit tester, and then completely disassembling and analyzing the battery cell;
test verification: 100 laminated lithium iron soft-package lithium ion batteries EV 10173248-20AH model electric cores are taken, vibration treatment is respectively adopted in the first embodiment, the second embodiment and the third embodiment, then short circuit test is carried out, and then all the electric cores are disassembled and analyzed;
the test data are as follows:
| acne normally present Resulting in a short circuit | Vibration induced pole piece Severe powder shedding | Vibration causes pole piece pole powder to drop tightly Heavy short circuit | Outer layer separator Membrane pleating | Residual acne still exists Hidden danger of short circuit | |
| Practice of Example one | 3 | 0 | 0 | 0 | 0 |
| Practice of Example two | 3 | 0 | 0 | 0 | 0 |
| Practice of EXAMPLE III | 4 | 0 | 0 | 0 | 0 |
| Comparison of Example one | 1 | 0 | 0 | 0 | 2 |
| Comparison of Example two | 3 | 10 | 3 | 10 | 0 |
| Comparison of EXAMPLE III | 3 | 0 | 0 | 3 | 1 |
As can be seen from the above table:
in the embodiment, when a pair of laminations are adopted, a battery cell with a diaphragm thickness of 20 micrometers is firstly subjected to low-frequency vibration treatment, the low-frequency vibration frequency is set at 10Hz, then the battery cell qualified through short circuit detection is subjected to high-frequency vibration treatment again, the high-frequency vibration frequency is set at 30Hz, and after the vibration treatment, the battery cell with short circuit caused by acne normally existing on a battery cell pole piece can be effectively screened out, the battery cell without residual acne is not generated, and the situations that the electrode powder of the battery cell pole piece is seriously fallen off and the diaphragm on the outer layer of the battery cell is wrinkled due to the vibration treatment are avoided;
in the embodiment, when two pairs of laminations are arranged, a battery cell with a diaphragm thickness of 32 micrometers is adopted to firstly carry out low-frequency vibration processing, the low-frequency vibration frequency is set at 20Hz, then the battery cell qualified through short circuit detection is subjected to high-frequency vibration processing again, the high-frequency vibration frequency is set at 70Hz, after the vibration processing, the battery cell with short circuit caused by acne normally existing on a battery cell pole piece can be effectively screened out, the battery cell without residual acne is not generated, and the situations that the electrode powder of the battery cell pole piece drops seriously and the diaphragm on the outer layer of the battery cell folds caused by the vibration processing are avoided;
when a pair of laminations are compared, only low-frequency vibration treatment is carried out on a battery cell with the diaphragm thickness of 25 micrometers, the low-frequency vibration frequency is set at 20Hz, and after the vibration treatment, although the battery cell with short circuit caused by acne normally existing on a pole piece of the battery cell can be screened out, the screening is not sufficient, the battery cell with the acne still remains, a good vibration effect cannot be achieved, and the hidden trouble of short circuit still exists in the subsequent procedures of some acne;
when two pairs of laminates are compared, only high-frequency vibration treatment is carried out on the battery cell with the diaphragm thickness of 32 microns, the high-frequency vibration frequency is 90Hz, and after the vibration treatment, although the battery cell which is short-circuited due to acne normally existing on a pole piece of the battery cell and does not have residual acne can be screened out, the vibration frequency is too high, so that the situations of serious pole piece powder falling of the pole piece of the battery cell and diaphragm wrinkling on the outer layer of the battery cell caused by the vibration treatment exist, and the performance and the appearance of the battery are influenced;
in the third comparative example, only high-frequency vibration treatment is carried out on a battery cell with a diaphragm thickness of 25 micrometers, the high-frequency vibration frequency is 70Hz, after the vibration treatment, although the battery cell with short circuit caused by acne normally existing on a pole piece of the battery cell can be screened, the screening is not sufficient, and the battery cell with the remaining acne still exists, although only the high-frequency vibration treatment is adopted, the small acne is not sufficiently vibrated, so that the acne which is not effectively vibrated is still present, a good vibration effect cannot be achieved, the hidden danger of short circuit still exists in the post-process of some acne, and the condition that the diaphragm on the outer layer of the battery cell is folded due to long-time high-frequency vibration treatment exists, so that the performance and the appearance of the battery are influenced;
by adopting the method for detecting the short-circuit cell after the lithium ion battery is laminated, firstly, the cell with the diaphragm thickness of more than or equal to 20 micrometers is adopted for short-time low-frequency vibration treatment during lamination, fine burrs which can cause short-circuit hidden danger and powder and fine vermicelli which are about to fall off are promoted to sharp short-circuit points in advance, so that the short-circuit cell with hidden danger is exposed in time, the short-circuit cell is preliminarily selected after primary cell short-circuit test, then the high-frequency vibration treatment is carried out on the laminated cell for short time, the vibration effect of the cell is improved, the short-circuit cell with hidden danger is further exposed in time, then the short-circuit test is carried out through a secondary cell short-circuit tester, the short-circuit cell is treated in time, the repair cost of the short-circuit cell is reduced, and the repair difficulty of the short-circuit cell is reduced; the battery core with the diaphragm thickness being greater than or equal to 20 micrometers is adopted to perform low-frequency vibration for a long time and high-frequency vibration for a short time during lamination, damage to the battery core due to long-time high-frequency vibration can be effectively avoided, short circuit caused by human factors to the battery core is reduced, the situation that short-time high-frequency vibration cannot reach a vibration effect is also effectively avoided, the situation that the battery core with hidden short-circuit points flows into subsequent processes is prevented, low-frequency vibration for a long time and high-frequency vibration for a short time are performed on the battery core after lamination, the vibration effect is good, the vibration processing efficiency is high, the short-circuit battery core is efficiently and accurately screened out, and the qualification rate of battery production is improved.
Example four
The invention provides a technical scheme that: a method for accurately detecting a short-circuit battery cell after lamination of a lithium ion battery comprises the following steps:
s1: placing an electric core with a diaphragm thickness of 16 micrometers on an electromagnetic vibration tester during lamination, performing low-frequency vibration treatment on the electric core to be detected, wherein the low-frequency vibration frequency is set at 10Hz, firstly performing low-frequency up-and-down vibration on the electric core, the amplitude of the low-frequency up-and-down vibration is 1.0mm, the vibration time is 10s, and then performing low-frequency left-and-right vibration on the electric core, wherein the amplitude of the low-frequency left-and-right vibration is 0.7mm, and the vibration time is 5 s;
s2: and the battery cell after low-frequency vibration treatment is subjected to short circuit test sequentially through a battery cell short circuit tester, and the short-circuited battery cell is selected.
EXAMPLE five
The invention provides a technical scheme that: a method for accurately detecting a short-circuit battery cell after lamination of a lithium ion battery comprises the following steps:
s1: placing an electric core with a diaphragm thickness of 18 microns on an electromagnetic vibration tester during lamination, performing low-frequency vibration treatment on the electric core to be detected, wherein the low-frequency vibration frequency is set at 20Hz, firstly, performing low-frequency up-and-down vibration on the electric core, the amplitude of the low-frequency up-and-down vibration is 1.5mm, the vibration time is 10s, and then performing low-frequency left-and-right vibration on the electric core, the amplitude of the low-frequency left-and-right vibration is 1.0mm, and the vibration time is 5 s;
s2: and (4) sequentially passing the battery cell subjected to low-frequency vibration treatment through a battery cell short circuit tester to perform short circuit test, and selecting the short-circuited battery cell.
Comparative example four: 100 lithium iron soft package lithium ion battery EV 70108148-10AH model electric cores after taking the lamination, battery core's diaphragm thickness is 18 microns, adopts the high-frequency vibration to handle: carrying out high-frequency vibration treatment on the battery cell, setting the high-frequency vibration frequency at 35Hz, firstly carrying out high-frequency vertical vibration on the battery cell, wherein the amplitude of the high-frequency vertical vibration is 1.0mm, and the vibration time is 5s, and then carrying out high-frequency horizontal vibration on the battery cell, wherein the amplitude of the high-frequency horizontal vibration is 1.0mm, and the vibration time is 3 s; sequentially carrying out short circuit test on the battery cell subjected to the high-frequency vibration treatment by using a battery short circuit tester, and then completely disassembling and analyzing the battery cell;
test verification: 100 laminated lithium iron soft-package lithium ion batteries EV 10173248-20AH model electric cores are taken, vibration treatment is respectively adopted in the fourth embodiment and the fifth embodiment, then short circuit test is carried out, and then all the electric cores are disassembled and analyzed;
the test data are as follows:
| acne normally present Resulting in a short circuit | Vibration induced pole piece Severe powder shedding | Vibration causes pole piece pole powder to drop tightly Heavy short circuit | Outer layer separator Membrane pleating | Residual acne still exists Hidden danger of short circuit | |
| Practice of Example four | 2 | 0 | 0 | 0 | 0 |
| Practice of Example five | 3 | 0 | 0 | 0 | 0 |
| Comparison of Example four | 3 | 6 | 2 | 8 | 0 |
As can be seen from the above table:
in the fourth embodiment, a battery cell with a diaphragm thickness of 16 micrometers is adopted for low-frequency vibration processing during lamination, the low-frequency vibration frequency is set at 10Hz, and after vibration processing, the battery cell with short circuit caused by acne normally existing on a battery cell pole piece can be effectively screened out, the battery cell without residual acne is not obtained, and the situations of serious pole powder falling of the battery cell pole piece and diaphragm wrinkling on the outer layer of the battery cell caused by vibration processing are avoided;
in the fifth embodiment, a battery cell with a diaphragm thickness of 18 micrometers is adopted for low-frequency processing during lamination, the low-frequency vibration frequency is set at 20Hz, and after vibration processing, the battery cell with short circuit caused by acne normally existing on a battery cell pole piece can be effectively screened out, the battery cell without residual acne is not obtained, and the situations of serious pole powder falling of the battery cell pole piece and diaphragm wrinkling on the outer layer of the battery cell caused by vibration processing are avoided;
in the fourth comparative example, a battery cell with a diaphragm thickness of 18 microns is adopted for high-frequency processing during lamination, the high vibration frequency is set at 35Hz, and after the vibration processing, although the battery cell which causes short circuit due to acne normally existing on a pole piece of the battery cell and does not have residual acne can be screened out, due to the fact that the vibration frequency is too high, the situations that pole powder of the pole piece of the battery cell drops seriously and the diaphragm on the outer layer of the battery cell folds due to high-frequency vibration exist, and the performance and the appearance of the battery are influenced;
by adopting the method for detecting the short-circuit cell after the lithium ion battery is laminated, the cell with the diaphragm thickness smaller than 20 microns is adopted for short-time low-frequency vibration treatment during lamination, fine burrs which possibly cause short-circuit hidden danger and powder and fine vermicelli which are about to fall off are promoted to sharp short-circuit points in advance, so that the short-circuit cell with hidden danger is exposed in time, the short-circuit cell is selected after a cell short-circuit test is carried out, the short-circuit cell is accurately screened out, the cell with hidden short-circuit points is prevented from flowing into a subsequent process, the short-circuit cell is treated in time, the repair cost of the short-circuit cell is reduced, and the repair difficulty of the short-circuit cell is reduced; and only the battery cell with the diaphragm thickness smaller than 20 micrometers is subjected to low-frequency treatment during lamination, so that the diaphragm of the battery cell is prevented from being damaged by high-frequency vibration, short circuit caused by human factors to the battery cell is reduced, and the qualified rate of battery production is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments 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. A method for accurately detecting a short-circuit battery cell after lamination of a lithium ion battery is characterized by comprising the following steps:
s1: placing the battery cell on an electromagnetic vibration tester, and carrying out low-frequency vibration processing on the battery cell to be detected, wherein the battery cell is firstly subjected to low-frequency up-and-down vibration, and then is subjected to low-frequency left-and-right vibration;
s2: sequentially passing the battery cell after low-frequency vibration treatment through a battery cell short-circuit tester to perform short-circuit test, and primarily selecting the short-circuited battery cell;
only performing the step S1 and the step S2 by using the battery cell with the diaphragm thickness less than 20 microns during lamination; when lamination is carried out, the battery core with the diaphragm thickness of more than or equal to 20 micrometers is adopted to continue the step S3 and the step S4;
s3: placing the qualified battery cell on the electromagnetic vibration tester again, and carrying out high-frequency vibration treatment on the battery cell, wherein the battery cell is subjected to high-frequency vertical vibration at first and then subjected to high-frequency left-right vibration;
s4: and (4) sequentially passing the battery cell after the high-frequency vibration treatment through a battery cell short circuit tester to perform short circuit test, and finally screening out qualified battery cells.
2. The method of claim 1, wherein the method comprises the steps of: the low-frequency vibration frequency is set to be 10-20Hz, the amplitude of the low-frequency up-and-down vibration is 1.0-1.5mm, and the vibration time is 10 s; the amplitude of the low-frequency left-right vibration is 0.5-1.0mm, and the vibration time is 5 s.
3. The method of claim 1, wherein the method comprises the steps of: the high-frequency vibration frequency is set to be 30-70Hz, the amplitude of high-frequency up-and-down vibration is 0.5-1.0mm, the vibration time is 5s, the amplitude of high-frequency left-and-right vibration is 0.5-1.0mm, and the vibration time is 3 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210123136.6A CN114184971B (en) | 2022-02-10 | 2022-02-10 | Method for accurately detecting short-circuit battery cells after lamination of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210123136.6A CN114184971B (en) | 2022-02-10 | 2022-02-10 | Method for accurately detecting short-circuit battery cells after lamination of lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114184971A true CN114184971A (en) | 2022-03-15 |
| CN114184971B CN114184971B (en) | 2024-01-26 |
Family
ID=80545826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210123136.6A Active CN114184971B (en) | 2022-02-10 | 2022-02-10 | Method for accurately detecting short-circuit battery cells after lamination of lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114184971B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115036591A (en) * | 2022-05-23 | 2022-09-09 | 江西酷电新能源有限公司 | Method for efficiently detecting short-circuit battery cell of lithium ion battery |
| CN115575850A (en) * | 2022-09-02 | 2023-01-06 | 湖北钛时代新能源有限公司 | Testing device for electric core vibration-leveling short circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08145867A (en) * | 1994-11-25 | 1996-06-07 | Shin Etsu Chem Co Ltd | Cell for simultaneously measuring electric resistance and change in weight of conductive polymer |
| JP2004039577A (en) * | 2002-07-08 | 2004-02-05 | Nissan Motor Co Ltd | Thin battery, battery pack, compound battery pack, and vehicle |
| CN102243284A (en) * | 2011-04-07 | 2011-11-16 | 深圳市量能科技有限公司 | Method for detecting micro-short-circuit of wound type battery |
| US20190165760A1 (en) * | 2017-11-28 | 2019-05-30 | Seiko Epson Corporation | Vibrator device, method of manufacturing vibrator device, electronic apparatus, and vehicle |
| CN110045290A (en) * | 2019-04-25 | 2019-07-23 | 上海空间电源研究所 | A kind of lithium-ions battery internal short-circuit latent defect lossless detection method |
-
2022
- 2022-02-10 CN CN202210123136.6A patent/CN114184971B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08145867A (en) * | 1994-11-25 | 1996-06-07 | Shin Etsu Chem Co Ltd | Cell for simultaneously measuring electric resistance and change in weight of conductive polymer |
| JP2004039577A (en) * | 2002-07-08 | 2004-02-05 | Nissan Motor Co Ltd | Thin battery, battery pack, compound battery pack, and vehicle |
| CN102243284A (en) * | 2011-04-07 | 2011-11-16 | 深圳市量能科技有限公司 | Method for detecting micro-short-circuit of wound type battery |
| US20190165760A1 (en) * | 2017-11-28 | 2019-05-30 | Seiko Epson Corporation | Vibrator device, method of manufacturing vibrator device, electronic apparatus, and vehicle |
| CN110045290A (en) * | 2019-04-25 | 2019-07-23 | 上海空间电源研究所 | A kind of lithium-ions battery internal short-circuit latent defect lossless detection method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115036591A (en) * | 2022-05-23 | 2022-09-09 | 江西酷电新能源有限公司 | Method for efficiently detecting short-circuit battery cell of lithium ion battery |
| CN115036591B (en) * | 2022-05-23 | 2024-05-03 | 江西酷电新能源有限公司 | Method for efficiently detecting short-circuit battery cells of lithium ion battery |
| CN115575850A (en) * | 2022-09-02 | 2023-01-06 | 湖北钛时代新能源有限公司 | Testing device for electric core vibration-leveling short circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114184971B (en) | 2024-01-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114184971A (en) | Method for accurately detecting short circuit cell after lamination of lithium ion battery | |
| CN107732337B (en) | Sorting method for retired battery modules | |
| CN106356554B (en) | Battery grouping method and device | |
| CN109425837B (en) | Rapid screening method of retired battery module | |
| CN115602949A (en) | Screening method for gradient use of waste batteries | |
| CN110333463B (en) | Battery cell consistency screening method and system | |
| CN105680108B (en) | A kind of screening technique of lithium ion battery | |
| CN109494412B (en) | LFP lithium ion battery cell capacity grading screening method | |
| CN107579298A (en) | Lithium ion battery grouping method | |
| CN102243284A (en) | Method for detecting micro-short-circuit of wound type battery | |
| CN113484778B (en) | Method for rapidly screening self-discharge of battery | |
| CN105548911A (en) | Method for lowering influence of reverse current on battery voltage-resistant insulation test | |
| CN108226806B (en) | Charge self-discharge detection method and battery detection device | |
| CN113391229A (en) | Performance evaluation method, equipment and system for retired power battery | |
| CN112798972B (en) | Method for rapidly evaluating consistency of lithium battery winding cores | |
| CN111751738A (en) | Process for detecting fragment cracking or tab cold welding of lithium ion battery pole | |
| CN113675489A (en) | Method for forming and screening bad cells | |
| CN104934628B (en) | Battery cell preparation system and method with pole piece and diaphragm detection function | |
| CN104091977B (en) | The detection method of wound lithium-ion battery | |
| CN110102515B (en) | Screening method of lithium ion battery cell based on thermal imager | |
| CN117269283A (en) | Method and equipment for detecting water content of battery cell | |
| CN107069124A (en) | Analysis method of the processing procedure to voltage influence between lithium ion battery aluminum shell and negative pole | |
| CN110429343A (en) | Lithium ion battery and its preparation process | |
| CN105903690B (en) | It is a kind of to screen the method for recycling bad battery core | |
| CN110707387A (en) | Self-discharge screening method for lithium iron phosphate core |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |