CN112525434A - Soft package lithium battery leakage detection method - Google Patents

Soft package lithium battery leakage detection method Download PDF

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Publication number
CN112525434A
CN112525434A CN202011189061.9A CN202011189061A CN112525434A CN 112525434 A CN112525434 A CN 112525434A CN 202011189061 A CN202011189061 A CN 202011189061A CN 112525434 A CN112525434 A CN 112525434A
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CN
China
Prior art keywords
battery
voltage
judging
products
discharging
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Withdrawn
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CN202011189061.9A
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Chinese (zh)
Inventor
曹盼盼
于月
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Boshuo Haoyi Automation Equipment Wuxi Co ltd
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Boshuo Haoyi Automation Equipment Wuxi Co ltd
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Priority to CN202011189061.9A priority Critical patent/CN112525434A/en
Publication of CN112525434A publication Critical patent/CN112525434A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/06—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness specially adapted for measuring length or width of objects while moving
    • 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
    • H01M10/4228—Leak testing of cells or 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
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The invention discloses a method for detecting leakage of a soft package lithium battery, which comprises the following steps: s1, placing a battery into a testing cavity, carrying out OCV (open Circuit control) testing on the battery, enabling the battery to enter the next flow when the voltage is within the rated range of a client, judging ok, judging that the voltage is abnormal, and discharging NG products; s2, performing voltage test, recording numerical values, and when the battery enters the next flow and is determined to be ok within the rated range of a client, discharging NG products when the voltage is abnormal; s3, quickly pumping negative pressure to the cavity to reach a certain negative pressure value, keeping for a certain time, detecting a change curve of the surface thickness of the battery by means of a displacement sensor while pumping the negative pressure, enabling the numerical value of each change point of the curve to be close to a reference curve, enabling the battery to enter the next process, judging ok, judging abnormal thickness and discharging NG products. Repeating the operation content of S2; by means of the cooperation of the negative pressure pumping and the displacement sensor, the thickness change of the surface of the battery is detected, and whether the battery is damaged or not is judged.

Description

Soft package lithium battery leakage detection method
Technical Field
The invention relates to a battery leakage detection method, in particular to a soft package lithium battery leakage detection method.
Background
The proportion of the aluminum plastic film soft package battery in the power battery is higher and higher, and the soft package battery is packaged by performing hot-press packaging on an opening of an aluminum plastic film packaging bag by using a packaging machine. In the production process of the soft package lithium battery, the battery cell leakage is possibly caused by the reasons of untight sealing, collision in the turnover process and the like, or the vacuum degree in the battery cell is lower than a calibration value, so that a defective product is produced.
In the prior art, leakage is detected by a differential pressure method, a sucker is used for adsorbing the surface of a battery, a cavity of the sucker is vacuumized, and then whether the battery leaks is judged by visually detecting whether bulges exist on the surface of the battery.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for detecting the leakage of a soft package lithium battery, which has the effect of not influencing the appearance of the battery.
In order to achieve the technical purpose, the invention provides the following technical scheme: a leakage detection method for a soft package lithium battery comprises the following steps:
s1, placing a battery into a testing cavity, carrying out OCV (open Circuit control) testing on the battery, enabling the battery to enter the next flow when the voltage is within the rated range of a client, judging ok, judging that the voltage is abnormal, and discharging NG products;
s2, performing side voltage test, recording numerical values, and when the battery is in a customer rated range, entering the next process and judging ok, wherein the voltage is abnormal and NG products are discharged;
s3, quickly pumping negative pressure to the cavity to reach a certain negative pressure value, keeping for a certain time, detecting a change curve of the surface thickness of the battery by means of a displacement sensor while pumping the negative pressure, enabling the battery to enter the next flow and judging ok, abnormal voltage and discharging NG products when the thickness change value is within the rated range of a client.
Through adopting above-mentioned technical scheme, earlier get rid of the obvious battery of damage with the help of OCV test and limit voltage test, take out the negative pressure to the die cavity again, if there is the damage in the battery, can have the air in the battery, because external pressure is less than the interior pressure of battery, the battery package can be by outside pulling, displacement sensor just can detect the change curve of battery surface thickness, if the battery adventitia is complete, battery surface thickness only can take place slight change, consequently damaged battery and normal battery just can be distinguished, whole process need not contact the battery body, can not form the sucking disc seal on the battery, the protection to the battery outward appearance has been realized.
Preferably, the step S2 includes two side voltage tests, after the first side voltage test, applying positive voltage to the cavity, keeping the cavity at a specified pressure for a certain time, and then performing the second side voltage test and recording the value.
Through adopting above-mentioned technical scheme, add the malleation to the die cavity, the battery is extruded and produces the trend of shrink, if there is the damage in the battery, electrolyte in the battery can flow and lie in the aluminium membrane surface, carries out limit voltage detection time this moment, can detect out the damage of battery, has improved the detection accuracy.
Preferably, the method also comprises S4. performing a side voltage test, recording numerical values, and judging ok when the battery enters the next process and is abnormal in voltage and discharging NG products within the rated range of a client.
Through adopting above-mentioned technical scheme, add the negative pressure back to the die cavity in S3, if there is the damage in the battery, can have the air in the battery, because external pressure is less than the internal pressure of battery, the electrolyte in the battery package can be sucked out, consequently can have electrolyte on the aluminium membrane, carries out the limit voltage test this moment, can detect out the damage of battery, has improved and has detected the accuracy.
Preferably, the internal resistance of the ammeter used in the side voltage test in S2 and S4 is 10M Ω, and a voltage of 2V is not applied between the negative electrode of the battery and the aluminum film before the side voltage test is performed.
By adopting the technical scheme, 2V voltage is applied between the battery cathode and the aluminum film before side voltage test in the prior art, a 10G omega internal resistance ammeter is adopted to detect the voltage value between the battery cathode and the aluminum film, and if the battery ok is adopted, the measured value is slightly lower than 2V; if the surface of the battery is damaged greatly and the negative electrode and the aluminum film form a short circuit, the measurement value is less than 1V. A10M omega ammeter is adopted, and meanwhile, when 2V voltage is not applied between the negative electrode of the battery and the aluminum film, if the battery is OK, the measured value is less than 1V, and if the battery surface is damaged and electrolyte flows out of the battery surface, the measured value is slightly lower than 2V, so that the side voltage test sensitivity used in the method is high, and the side voltage can be tested as long as the electrolyte is on the surface of the aluminum film.
In summary, the present invention achieves the following effects:
1. by means of the matching of the negative pressure pumping and the displacement sensor, the thickness change of the surface of the battery is detected, and whether the battery is damaged or not is judged;
2. by means of the cooperation of positive and negative charging voltage and side voltage testing, the detection of slightly damaged batteries is realized.
Drawings
Fig. 1 is a schematic diagram for illustrating the overall detection method in this embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Example (b): a leakage detection method for a soft package lithium battery comprises the following steps:
s1, placing a battery into a testing cavity, carrying out OCV (open Circuit control) testing on the battery, enabling the battery to enter the next flow when the voltage is within the rated range of a client, judging ok, judging that the voltage is abnormal, and discharging NG products;
s2, carrying out a first side voltage test, recording a numerical value, and when the battery enters a next process and is judged to be ok within a customer rated range, discharging NG products if the voltage is abnormal;
s3, applying positive pressure to the cavity, keeping the cavity under the specified pressure for a certain time (single or multiple cycles according to actual conditions, and adjusting the positive pressure keeping time according to the actual conditions), carrying out secondary side voltage test and recording numerical values, judging that the battery enters the next process within the rated range of a client to be OK, and otherwise, discharging NG products;
s4, releasing pressure to the cavity, quickly pumping negative pressure to reach a certain negative pressure value, keeping for a certain time, detecting a change curve of the surface thickness of the battery by means of a displacement sensor while pumping the negative pressure, enabling the battery to enter the next flow and judging ok, abnormal voltage and discharge of NG products when the thickness change value is within a customer rated range;
and S5, carrying out a third side voltage test, recording the numerical value, and when the battery is in the rated range of the client, entering the next process and judging ok, wherein the voltage is abnormal, and NG products are discharged.
The internal resistance of the ammeter used in the side voltage test in S2, S3 and S5 is 10M omega, and 2V voltage is not applied between the negative electrode of the battery and the aluminum film before the side voltage test is carried out. In the prior art, 2V voltage is applied between a battery cathode and an aluminum film before side voltage test, a voltage value between the battery cathode and the aluminum film is detected by adopting a 10G omega internal resistance ammeter, and if the battery ok is used, the measured value is slightly lower than 2V; if the surface of the battery is damaged greatly and the negative electrode and the aluminum film form a short circuit, the measurement value is less than 1V. An ammeter with internal resistance of 10M omega is adopted, and when 2V voltage is not applied between the negative electrode of the battery and the aluminum film, if the battery is OK, the measured value is less than 1V, and if the surface of the battery is damaged, the measured value is slightly less than 2V, so that the side voltage test sensitivity used in the method is high, and the measurement can be carried out as long as electrolyte leaks and flows out on the surface of the aluminum film.
Therefore, in the S2, the batteries which are seriously damaged or have the electrolyte on the surface are screened out, and the pressure change test of each battery is not needed, so that the detection efficiency is improved.
In the step S3, positive pressure is applied to the cavity, the battery is squeezed and tends to contract, if the battery is damaged, the electrolyte in the battery flows out and is located on the surface of the aluminum film, and when the side voltage detection is performed, the damage of the battery can be detected, so that the detection accuracy is improved.
In S4, negative pressure is pumped to the cavity, if the battery is damaged, air exists in the battery, the battery pack can be pulled outwards due to the fact that the external pressure is smaller than the internal pressure of the battery, the change curve of the surface thickness of the battery can be detected by the displacement sensor, if the outer membrane of the battery is complete, the surface thickness of the battery only slightly changes, accordingly, the damaged battery and the normal battery can be distinguished, the whole process does not need to contact the battery body, a sucker print cannot be formed on the battery, and the appearance of the battery is protected.
After negative pressure is applied to the cavity in S4, if the battery is damaged, air exists in the battery, and since the external pressure is smaller than the internal pressure of the battery, electrolyte in the battery pack can be sucked out, so that the electrolyte exists on the aluminum film, and the third side voltage test is performed, so that the damage of the battery can be detected, and the detection accuracy is further improved.

Claims (4)

1. The method for detecting the leakage of the soft package lithium battery is characterized by comprising the following steps of:
s1, placing a battery into a testing cavity, carrying out OCV (open Circuit control) testing on the battery, enabling the battery to enter the next flow when the voltage is within the rated range of a client, judging ok, judging that the voltage is abnormal, and discharging NG products;
s2, performing voltage test, recording numerical values, and when the battery enters the next flow and is determined to be ok within the rated range of a client, discharging NG products when the voltage is abnormal;
s3, applying positive pressure to the test cavity, and keeping the test cavity under a specific pressure for a certain time;
s5, carrying out a second voltage test and recording the numerical value, judging whether OK is available or not within the rated range, and if not, discharging NG products and enabling the battery to enter the next process;
s6, quickly pumping negative pressure to the cavity to reach a certain negative pressure value, keeping for a certain time, detecting a change curve of the surface thickness of the battery by means of a displacement sensor while pumping the negative pressure, enabling the battery to enter the next flow and judging ok, abnormal voltage and discharging NG products when the thickness change value is within the rated range of a client.
And S7, performing a third voltage test, recording the numerical value, judging whether OK is available or not within the rated range, otherwise, discharging NG products, and enabling the battery to enter the next process.
2. The method for detecting the leakage of the soft package lithium battery according to claim 1, characterized in that: the step S2 includes two side voltage tests, where after the first side voltage test, a positive voltage is applied to the cavity and kept at a specified pressure for a certain time, and then a second side voltage test is performed and a value is recorded.
3. The method for detecting leakage of the soft package lithium battery according to claim 1 or 2, characterized in that: and S4, performing side voltage test, recording numerical values, and when the battery enters the next flow and is determined to be ok within the rated range of a client, judging that the voltage is abnormal and discharging NG products.
4. The method for detecting the leakage of the soft package lithium battery according to claim 3, characterized in that: and the internal resistance of an ammeter used in the side voltage tests of S2 and S4 is 10M omega, and 2V voltage is not added between the negative electrode of the battery and the aluminum film before the side voltage test is carried out.
CN202011189061.9A 2020-10-30 2020-10-30 Soft package lithium battery leakage detection method Withdrawn CN112525434A (en)

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Application Number Priority Date Filing Date Title
CN202011189061.9A CN112525434A (en) 2020-10-30 2020-10-30 Soft package lithium battery leakage detection method

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Application Number Priority Date Filing Date Title
CN202011189061.9A CN112525434A (en) 2020-10-30 2020-10-30 Soft package lithium battery leakage detection method

Publications (1)

Publication Number Publication Date
CN112525434A true CN112525434A (en) 2021-03-19

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CN202011189061.9A Withdrawn CN112525434A (en) 2020-10-30 2020-10-30 Soft package lithium battery leakage detection method

Country Status (1)

Country Link
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Application publication date: 20210319