CN111007408A - Soft package lithium ion battery edge voltage defect detection, analysis and repair method and device - Google Patents
Soft package lithium ion battery edge voltage defect detection, analysis and repair method and device Download PDFInfo
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- CN111007408A CN111007408A CN201911288685.3A CN201911288685A CN111007408A CN 111007408 A CN111007408 A CN 111007408A CN 201911288685 A CN201911288685 A CN 201911288685A CN 111007408 A CN111007408 A CN 111007408A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000007547 defect Effects 0.000 title claims description 21
- 230000008439 repair process Effects 0.000 title abstract description 22
- 238000001514 detection method Methods 0.000 title abstract description 20
- 238000004458 analytical method Methods 0.000 title description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 35
- 239000002985 plastic film Substances 0.000 claims abstract description 20
- 229920006255 plastic film Polymers 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 3
- 229910052710 silicon Inorganic materials 0.000 claims 3
- 239000010703 silicon Substances 0.000 claims 3
- 239000004411 aluminium Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000002950 deficient Effects 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000000741 silica gel Substances 0.000 description 6
- 229910002027 silica gel Inorganic materials 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000013102 re-test Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012354 overpressurization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
Abstract
The invention relates to the technical field of batteries, and particularly discloses a method and a device for detecting, analyzing and repairing the poor edge voltage of a soft package lithium ion battery. The method for detecting and analyzing the poor edge voltage of the soft package lithium ion battery comprises the following steps: (1) applying high voltage between a tab of the soft package lithium ion battery and an aluminum layer of the aluminum-plastic film in a mode of gradually increasing the voltage; (2) acquiring temperature distribution information of the soft package lithium ion battery in the high voltage applying process in the step (1); (3) and (3) identifying the heating position of the soft package lithium ion battery according to the temperature distribution information in the step (2). The invention also provides a method for repairing the poor edge voltage of the soft package lithium ion battery and a device for the method. The method is simple and quick, and can judge the edge voltage abnormity occurrence site quickly, accurately and in real time and guide the production line to adjust in time. And the detection is nondestructive and safe, and can also be applied to the repair of batteries with poor side voltage.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method and a device for detecting, analyzing and repairing the poor edge voltage of a soft package lithium ion battery.
Background
The poor side voltage is common in the manufacturing process of the soft package lithium ion battery, and the poor side voltage of the soft package lithium ion battery is caused by the damage of an aluminum plastic film PP layer, so that an aluminum layer of the aluminum plastic film is in direct or indirect contact with a battery tab or internal electrolyte. Thereby causing the corrosion of the aluminum layer of the aluminum plastic film, further causing the bulging and leakage of the battery and potential safety hazard. There are a number of patents directed to the detection of edge voltage defects. For example: chinese patents/applications, CN 205333826U (201521048319.8), CN 205720383U (application No. 201620641468.3), CN 207215965U (application No. 201721237246.6), CN 207248935U (application No. 201721245013.0), CN 208513103U (application No. 201820765074.8), CN 208334591U (application No. 201820772789.6), CN 108226801 a (application No. 201810031705.8), disclose and improve the edge voltage testing device and method. However, although the method provided in the above patent/application can effectively detect the bad side voltage and screen the bad battery in time, the site and reason of the bad side voltage cannot be analyzed, so that the reason of the bad side voltage cannot be adjusted in time to improve the manufacturing yield.
For the confirmation of the bad sites, the existing document, "study on the corrosion mechanism in lithium ion batteries with soft package" (battery industry, vol. 22, No. 4, page 180-. The traditional Chinese patent CN104330710B discloses a method for rapidly judging poor insulation of a soft package lithium ion battery aluminum-plastic film, the method comprises the steps of penetrating a probe into any edge sealing of the soft package lithium ion battery to enable the probe to be in contact with an aluminum layer in the edge sealing aluminum-plastic film, respectively connecting the probe and a positive electrode lug or a negative electrode lug of the soft package lithium ion battery with two electrodes of a voltage-adjustable direct current power supply through a lead, and judging the position of a poor site by burning the site with poor insulation of the aluminum-plastic film through high-voltage breakdown.
In addition, no mature technical scheme exists for repairing the site with poor side voltage.
Therefore, it is necessary to provide a new method and device for detecting, analyzing and repairing the edge voltage defect of the soft package lithium ion battery to solve the problems in the prior art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a nondestructive soft package lithium ion battery edge voltage defect detection and analysis method which is more convenient and accurate and has high safety.
In order to achieve the purpose of the invention, the technical scheme of the invention is as follows:
a detection and analysis method for soft package lithium ion battery edge voltage failure comprises the following steps:
(1) applying high voltage between the lug of the soft package lithium ion battery and the aluminum layer of the aluminum plastic film in a mode of gradually increasing the voltage;
(2) acquiring temperature distribution information of the soft package lithium ion battery in the high voltage applying process in the step (1);
(3) and (3) identifying the heating position according to the temperature distribution information in the step (2).
In the prior art, a scheme of determining a defect point by judging a heating position after an electric component is pressurized is known, but a soft package lithium battery is different from a conventional electric component, the conventional electric component belongs to a first-class conductor, a lithium ion battery is a complex system comprising a first-class conductor, a second-class conductor and an insulator, the side voltage is poor and is not an electronic short circuit, and even if the side voltage is poor, the resistance between a tab and an aluminum plastic film aluminum layer of the soft package lithium battery can reach the megaohm level, so that the conventional electric component pressurization defect judgment method is not suitable. The detection method of the invention causes polarization between the lithium battery tab and the aluminum layer of the aluminum plastic film, and causes weak leakage current of the defective site through voltage adjustment, so that the defective site generates heat to be identified, and the detection analysis method of the soft package lithium ion battery edge voltage defect which is lossless and can accurately judge the defective site is obtained.
According to the invention, adjustable high voltage is applied between the tab of the soft package lithium ion battery and the aluminum layer of the aluminum plastic film, so that the internal polarization of the battery is caused, weak leakage current is generated at the poor site of the pp layer of the inner layer, and heat is further generated, so that the heating point can be detected by analyzing the temperature distribution information of the soft package lithium ion battery, and the abnormal site of the side voltage can be determined. The invention stops applying high voltage when distinguishing the heating position (namely a bad point) by matching the gradual pressurization mode with the continuous collection and judgment of temperature distribution information, can carry out nondestructive detection aiming at the bad conditions of side voltage of various degrees, is more convenient, accurate and safe (no liquid leakage and smoke) compared with the existing detection mode of directly applying specific high voltage breakdown, can reduce the use of the battery with bad voltage after detection, does not need to be directly scrapped, and avoids the detection waste.
In the method of the invention, the high voltage is 100-1500V, and the boosting rate of the high voltage is 300-1000V/min, preferably 500-900V/min.
The invention not only ensures the detection of the bad side voltages of various degrees through the selection of the specific high voltage range, but also can avoid the defect breakdown and the battery damage caused by the improper voltage, and the boosting rate is favorable for the establishment of the electric field in the battery to promote the generation of the leakage current of the defect site.
In the method, the temperature distribution information in the step (2) is obtained through an infrared imager, and the temperature resolution of the infrared imager is higher than 0.1 ℃.
In step (1) of the present invention, the high voltage is conducted by contacting the aluminum layer with a conductive silicone gel.
In the method, before the conductive silica gel is contacted with the aluminum layer, the aluminum layer is polished.
The invention utilizes the thermal effect of micro-current, has low temperature rise, and needs a high-precision infrared imager (the temperature resolution is higher than 0.1 ℃) to ensure the testing sensitivity and avoid the damage of the battery structure caused by over pressurization. The aluminum-plastic film polishing device disclosed by the invention has the advantages that the conductive silica gel is contacted with the aluminum-plastic film, the misjudgment caused by poor contact is avoided, and the aluminum layer of the aluminum-plastic film can be polished before the conductive silica gel is contacted with the aluminum-plastic film, so that the good contact is ensured.
Preferably, when the temperature distribution information is acquired through the infrared imager, the infrared imager is fixed at a position 1.5 meters away from the soft package lithium ion battery to be detected, and the included angle between the view field and the plane of the battery is 45 degrees, so that each point of the battery can be observed conveniently, and the sufficient spatial resolution is ensured.
The invention also aims to provide a simple and effective method for repairing the edge voltage defect of the soft package lithium ion battery.
The method for repairing the poor edge voltage of the soft package lithium ion battery comprises the steps (1) - (3) of the method for detecting and analyzing the poor edge voltage of the soft package lithium ion battery, and further comprises the following steps:
(4) and if the high voltage at the heating position of the soft package lithium ion battery is identified to be 500-1500V, keeping the high voltage for 0.5-2 minutes.
The repairing method is particularly suitable for finding the side voltage defective battery when the high voltage of the heating position is 500-1500V when the detection analysis method is used for detecting the soft package lithium ion battery, and the repairing of the defective site can be realized only by keeping the high voltage of the heating position for a short time so as to obtain the battery with qualified side voltage.
The high voltage holding time during repair is beneficial to repair of bad sites, and can prevent the PP layer from being further damaged due to overlong high voltage application time and higher temperature.
The invention further aims to provide a device for the method for detecting and analyzing the edge voltage defect of the soft package lithium ion battery or the method for repairing the edge voltage defect of the soft package lithium ion battery.
The device includes: the voltage applying unit is used for applying high voltage between the lug of the soft package lithium ion battery and the aluminum layer of the aluminum plastic film in a mode of gradually increasing the voltage;
the temperature distribution information acquisition unit is used for acquiring the temperature distribution information of the soft package lithium ion battery in the process of applying the high voltage;
and the temperature distribution information display unit is used for displaying the acquired temperature distribution information.
The device can be connected with a control system and integrated in a production line, so that online monitoring is realized.
The device of the invention also comprises conductive silica gel which is used for contacting with the aluminum layer to conduct the high voltage.
In the device of the invention, the output voltage of the voltage applying unit is 100-1500V.
In the device, the temperature distribution information acquisition unit and the temperature distribution information display unit are formed by an infrared imager, and the temperature resolution of the infrared imager is higher than 0.1 ℃.
The invention can also select the form of combining the infrared camera with the display to acquire and display the acquired temperature distribution information so as to judge the heating point.
The invention has the beneficial effects that:
the method is simple and rapid, and can rapidly and accurately judge the edge voltage abnormity occurrence point and guide the production line to be adjusted in time. And the detection is nondestructive and safe, and has important significance for improving the manufacturing yield and the detection safety of the lithium ion battery and reducing the detection rejection rate. The invention can also utilize the heat effect of leakage current to realize the dissolution recrystallization of the pp layer and partially repair the defective products, and the method is simple, convenient and quick.
Drawings
FIG. 1 is a schematic diagram of detecting the edge voltage failure of a soft package lithium ion battery according to the present invention;
fig. 2 is an infrared image of the local temperature distribution of the soft package lithium ion battery in example 1 of the present invention when the voltage output is 1000V;
fig. 3 is an infrared image of the temperature distribution of the original defective site of the soft-package lithium ion battery repaired in embodiment 1 of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail with reference to the following examples. It is to be understood that the following examples are given for illustrative purposes only and are not intended to limit the scope of the present invention. Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the spirit and scope of this invention.
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents, instruments and the like used in the following examples are commercially available unless otherwise specified.
Example 1
The embodiment provides a method, a repairing method and a device for detecting the poor edge voltage of a soft package lithium ion battery.
In the embodiment, a DW-P202-100ACDE high-voltage power supply of the east high-voltage power supply company Limited is used as a voltage applying unit, and a Feillier (FLIR) TG167 infrared imager (the temperature resolution is 0.1 ℃) is used as a temperature distribution information acquiring unit and a temperature distribution information displaying unit to perform edge voltage defect detection and analysis on the soft package lithium ion battery. Referring to fig. 1, the schematic diagram of detecting the edge voltage failure of the soft package lithium ion battery according to the invention is shown.
The specific detection steps are as follows:
(1) taking a soft package lithium ion battery to be tested, and placing the soft package lithium ion battery on an insulating desktop; the lead with the conductive clamp is used for connecting a negative electrode tab of the soft package lithium ion battery to be tested with a negative electrode of the high-voltage power supply, and the conductive silica gel is used for contacting an aluminum plastic film aluminum layer and is connected with a positive electrode of the high-voltage power supply through the lead.
(2) The infrared imager is fixed at a position 1.5 meters away from the soft package lithium ion battery to be detected, and the included angle between the view field and the plane of the battery is 45 degrees.
(3) And starting a high-voltage power supply (with the initial voltage of 100V) and the infrared imager, and increasing the direct-current voltage at the boosting speed of 500V/min.
When the voltage output is 1000V, it can be seen that the temperature of a poor site (see the area indicated by the white arrow in fig. 2) is obviously higher than that of the peripheral area in the temperature distribution infrared image (fig. 2) of the soft package lithium ion battery to be tested, and it is shown that the poor site is located at the bottom of the two batteries. At this point the cell has not broken down and defects in the cell can already be identified by infrared imaging.
The edge voltage of the soft package lithium ion battery manufactured subsequently can be eliminated by adjusting the positions of the two seal seals and the temperature of the seal heads.
In this embodiment, after the 1000V voltage is further kept for 0.8 minute, the soft package lithium ion battery is cooled to room temperature, and the soft package lithium ion battery with the defective site located at the bottom of the two batteries is repaired.
By adopting the detection method of the embodiment, the repaired soft package lithium ion battery is detected again by the 1000V voltage output, at this time, the infrared image of the temperature distribution of the original defective site of the repaired soft package lithium ion battery is shown in fig. 3, and it can be known from fig. 3 that the temperature of the original defective site is the same as that of the peripheral area, which indicates that the defective site has been repaired.
In this embodiment, the universal meter is used to test the voltage between the aluminum layer and the negative electrode tab before and after repair, the repair effect is verified, the edge voltage of the soft package lithium ion battery to be tested before repair is 1.2V, and the edge voltage after repair is 0V. The side voltage failure disappears.
Example 2
In this example, the soft-package lithium ion battery with poor edge voltage was tested and repaired using the equipment and procedure described in example 1. The only difference is that: and increasing the direct current voltage at a boosting speed of 400V/min, and observing a bad point by the infrared imager when the voltage output is 800V. The 800V output voltage was maintained for 1 minute and the cell cooled to room temperature. The edge voltage of the soft package lithium ion battery to be detected before repair is 1.3V, and the edge voltage after repair is 0V. And (5) retesting the edge voltage to be qualified, and repairing the defect site.
Example 3
In this example, the soft-package lithium ion battery with poor edge voltage was tested and repaired using the equipment and procedure described in example 1. The only difference is that: and increasing the direct current voltage at a boosting speed of 300V/min, and when the voltage output is 500V, observing a bad site by the infrared imager. The 500V output voltage was maintained for 2 minutes and the cell was cooled to room temperature. The edge voltage of the soft package lithium ion battery to be detected before repair is 1.3V, and the edge voltage after repair is 0.01V. And (5) retesting the edge voltage to be qualified, and repairing the defect site.
Example 4
In this example, the soft-package lithium ion battery with poor edge voltage was tested and repaired using the equipment and procedure described in example 1. The only difference is that: the direct current voltage is increased at the boosting speed of 900V/min, and when the voltage output is 1100V, the infrared imager observes a bad point. The 1100V output voltage was maintained for 0.6 min and the cell cooled to room temperature. The edge voltage of the soft package lithium ion battery to be detected before repair is 0.8V, and the edge voltage after repair is 0.02V. And (5) retesting the edge voltage to be qualified, and repairing the defect site.
Example 5
In this example, the soft-package lithium ion battery with poor edge voltage was tested and repaired using the equipment and procedure described in example 1. The only difference is that: and increasing the direct current voltage at a boosting speed of 1000V/min, and observing a bad site by the infrared imager when the voltage output is 1500V. The 1500V output voltage was maintained for 0.5 min and the cell cooled to room temperature. The edge voltage of the soft package lithium ion battery to be detected before repair is 0.6V, and the edge voltage after repair is 0.03V. And (5) retesting the edge voltage to be qualified, and repairing the defect site.
Comparative example 1
In the comparative example, the high-voltage power supply and the infrared imager described in example 1 were used to perform detection and analysis on the soft package lithium ion battery with poor voltage. The method comprises the following specific steps:
(1) taking a soft package lithium ion battery to be tested, and placing the soft package lithium ion battery on an insulating desktop; the lead with the conductive clamp is used for connecting a negative electrode tab of the soft package lithium ion battery to be tested with a negative electrode of the high-voltage power supply, and the conductive silica gel is used for contacting an aluminum plastic film aluminum layer and is connected with a positive electrode of the high-voltage power supply through the lead.
(2) The infrared imager is fixed at a position 1.5 meters away from the soft package lithium ion battery to be detected, and the included angle between the view field and the plane of the battery is 45 degrees.
(3) And starting a high-voltage power supply (with the initial voltage of 100V) and the infrared imager, and increasing the direct-current voltage at the boosting speed of 1100V/min.
When the output voltage is 800V, the infrared imager observes the poor site of the side voltage, and the poor site is broken down by the current at the same time, so the battery is scrapped.
Comparative example 2
In the comparative example, the soft-package lithium ion battery with poor edge voltage was tested and repaired by using the equipment and procedure described in example 1. In this comparative example, when the voltage output was 600V, the infrared imager observed a poor spot. The 600V output voltage was maintained for 3 minutes and the cell cooled to room temperature. The edge voltage of the soft package lithium ion battery to be detected before repair is 1.2V, and the edge voltage after repair is 1.1V. The retest edge voltage is still unqualified.
Comparative example 3
In the comparative example, the soft-package lithium ion battery with poor edge voltage was tested and repaired by using the equipment and procedure described in example 1. Except that the boost rate was 300V/min, and the comparative example observed a poor spot when the voltage output was 400V. The 400V output voltage was maintained for 2 minutes and the cell was cooled to room temperature. The edge voltage of the soft package lithium ion battery to be detected before repair is 1.3V, and the edge voltage after repair is 1.3V. The retest edge voltage is still unqualified.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The method for detecting and analyzing the poor edge voltage of the soft package lithium ion battery is characterized by comprising the following steps of:
(1) applying high voltage between the lug of the soft package lithium ion battery and the aluminum layer of the aluminum plastic film in a mode of gradually increasing the voltage;
(2) acquiring temperature distribution information of the soft package lithium ion battery in the high voltage applying process in the step (1);
(3) and (3) identifying the heating position of the soft package lithium ion battery according to the temperature distribution information in the step (2).
2. The method as claimed in claim 1, wherein the high voltage is 1500V and the boosting rate of the high voltage is 1000V/min and preferably 900V/min and is 100V/min and 300V/min.
3. The method according to claim 1 or 2, wherein the temperature distribution information in step (2) is acquired by an infrared imager having a temperature resolution higher than 0.1 ℃.
4. A method according to any of claims 1-3, characterized in that in step (1) the high voltage is conducted by means of an electrically conductive silicon gel in contact with the aluminium layer.
5. The method of claim 4, wherein the aluminum layer is polished before the conductive silicon gel contacts the aluminum layer.
6. A method for repairing soft package lithium ion battery edge voltage failure, characterized by comprising the method according to any one of claims 1-5, and further comprising:
(4) and if the high voltage at the heating position of the soft package lithium ion battery is identified to be 500-1500V, keeping the high voltage for 0.5-2 minutes.
7. An apparatus for the method for detecting and analyzing the soft package lithium ion battery edge voltage defect according to any one of claims 1 to 5 or the method for repairing the soft package lithium ion battery edge voltage defect according to claim 6, comprising:
the voltage applying unit is used for applying high voltage between the lug of the soft package lithium ion battery and the aluminum layer of the aluminum plastic film in a mode of gradually increasing the voltage;
the temperature distribution information acquisition unit is used for acquiring the temperature distribution information of the soft package lithium ion battery in the process of applying the high voltage;
and the temperature distribution information display unit is used for displaying the acquired temperature distribution information.
8. The device of claim 7, further comprising a conductive silicon gel to conduct the high voltage in contact with the aluminum layer.
9. The apparatus as claimed in claim 7 or 8, wherein the output voltage of the voltage applying unit is 1500V-100V.
10. The apparatus according to any one of claims 7 to 9, wherein the temperature distribution information acquisition unit and the temperature distribution information display unit are constituted by an infrared imager having a temperature resolution higher than 0.1 ℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113948758A (en) * | 2021-09-30 | 2022-01-18 | 珠海冠宇电池股份有限公司 | Battery and battery repairing method |
| CN114859246A (en) * | 2022-07-07 | 2022-08-05 | 江苏中兴派能电池有限公司 | Soft package battery detection method and device, computer equipment and storage medium |
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| CN114859246B (en) * | 2022-07-07 | 2022-09-09 | 江苏中兴派能电池有限公司 | Soft package battery detection method and device, computer equipment and storage medium |
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