CN110887616A - Method for detecting leakage of tab glue part of soft package lithium ion battery - Google Patents
Method for detecting leakage of tab glue part of soft package lithium ion battery Download PDFInfo
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- CN110887616A CN110887616A CN201811041467.5A CN201811041467A CN110887616A CN 110887616 A CN110887616 A CN 110887616A CN 201811041467 A CN201811041467 A CN 201811041467A CN 110887616 A CN110887616 A CN 110887616A
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- battery
- ink
- leakage
- tab glue
- tab
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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
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
Abstract
The invention discloses a method for detecting leakage of a tab glue part of a soft package lithium ion battery, which comprises the following steps: (1) discharging the battery; (2) then injecting ink by using an injector; (3) putting the ink into an oven to accelerate the permeation of the ink; (4) and then the battery is decomposed, and the dyed layer surface of the lug part is observed, wherein the dyed layer surface is the root cause of the leakage. The method can quickly and accurately judge the leakage at the tab glue position due to any defect of poor glue melting of the aluminum plastic film and the tab glue, delamination of the tab glue and a metal belt, self delamination of the tab glue, foreign matter clamping of top seal and the like, and can quickly and accurately judge whether the defect is a packaging defect or a tab incoming material defect; according to the invention, the leakage defect position of the tab glue part of the soft package lithium ion battery is dyed, so that the hierarchy is clear, and the taking of photos and the judgment of responsibility are facilitated.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a method for detecting leakage of a tab glue part of a soft package lithium ion battery.
Background
The soft package lithium ion battery has high energy density, light weight and various shape changes, and can be made into an ultra-thin battery
And the like, so that the current electronic mobile products basically adopt a flexible package lithium ion battery as an energy source. The aluminum plastic film is an important component of the soft package lithium ion battery. The battery packaging is one of the important processes for producing soft package lithium ion batteries, and the sealing property and the reliability of the packaging are very important. Electrolyte and aqueous vapor belong to liquid and gas, the encapsulation is not good, any tiny gap is possible to pass through, especially the top seal edge of the soft package lithium ion battery is to heat seal the aluminum plastic film PP layer and the tab together, the tab is composed of tab glue and a metal belt, sometimes the tab glue is a multilayer structure, and after heat seal, the tab glue and the aluminum plastic film are mutually fused together, thus ensuring the encapsulation tightness.
At present, the conventional method for analyzing the leakage of the tab part of the soft package lithium ion battery is to directly disassemble the packaging part, and analyze and judge the reason of the leakage of the tab part caused by poor packaging tightness by detecting the fusion state. However, the tab glue and the aluminum plastic film are fused and adhered together, the original state can be damaged after the tab glue and the aluminum plastic film are disassembled, the defects are difficult to distinguish, and the defects belong to poor melting glue of the aluminum plastic film and the tab glue, delamination of the tab glue and a metal belt, self delamination of the tab glue, foreign matters clamped in a top seal and the like, so that the judgment error of the liquid leakage reason is easily caused. Another method is to slice the top edge seal and then observe it with an electron microscope, but this method involves a large investment in inspection equipment.
In view of the above, a method for detecting leakage of a tab glue portion of a soft-package lithium ion battery is needed to solve the defects in the prior art.
Disclosure of Invention
The invention mainly aims at the defects of the prior art, and provides a method for detecting leakage of a tab glue part of a soft-package lithium ion battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for detecting leakage of a tab glue part of a soft package lithium ion battery comprises the following steps:
(1) discharging the battery, namely discharging at a constant current of 0.1CmA until the cut-off voltage is less than or equal to 2.5V, and then discharging at a constant current of 0.05CmA until the cut-off voltage is less than or equal to 1.5V;
(2) injecting ink diluent used by a pen by using an injector, wherein the amount of the injected ink diluent is 10% -30% of the original injection amount of the battery;
(3) putting the battery filled with the ink into an oven, setting the temperature to be 45-60 ℃, and storing for 2-4 hours to accelerate the permeation of the color ink diluent;
(4) after high-temperature storage, the battery is disassembled, the dyed layer surface of the lug part is observed, and the dyed layer surface is the root cause of the leakage.
The ink is blue-black ink or pure blue ink, and the ratio of the ink to the water in a dilution ratio is 1: 5-1: 1.
The invention has the beneficial effects that:
(1) the method can quickly and accurately judge the leakage at the tab glue position due to any defect of poor glue melting of the aluminum plastic film and the tab glue, delamination of the tab glue and a metal belt, self delamination of the tab glue, foreign matter clamping of top seal and the like, and can quickly and accurately judge whether the defect is a packaging defect or a tab incoming material defect;
(2) according to the invention, the leakage defect position of the tab glue part of the soft package lithium ion battery is dyed, so that the hierarchy is clear, and the taking of photos and the judgment of responsibility are facilitated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a flow chart of the detection method of the present invention.
Fig. 2 is a schematic diagram illustrating the operation of injecting ink into the battery according to the present invention.
Fig. 3 is an example of a pattern of a battery tab portion after liquid leakage and dyeing, which is detected in embodiment 1 of the present invention.
Wherein 1-is the battery to be detected, and 2-is the injector with ink.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the predetermined objects, the present invention provides an analysis method, the specific implementation, the features and the effects thereof, which are described in detail as follows:
example 1:
a method for detecting leakage of a tab glue part of a soft package lithium ion battery comprises the following steps:
(1) discharging the battery, namely discharging the battery to cut-off voltage of 2.5V at a constant current of 0.1CmA, and then discharging the battery to cut-off voltage of 1.5V at a constant current of 0.05 CmA;
(2) injecting ink diluent (the dilution ratio: the ratio of ink to water is 1: 1) used by a pen into the battery by using an injector, wherein the amount of the injected ink diluent is 30% of the original injection amount of the battery;
(3) putting the battery filled with the ink into an oven, setting the temperature to be 45-60 ℃, and storing for 2 hours to accelerate the permeation of the color ink diluent;
(4) after high-temperature storage, the battery is disassembled, the dyed layer surface of the lug part is observed, and the dyed layer surface is the root cause of the leakage.
Example 2:
a method for detecting leakage of a tab glue part of a soft package lithium ion battery comprises the following steps:
(1) discharging the battery, namely discharging the battery to cut-off voltage of 2.0V at a constant current of 0.1CmA, and then discharging the battery to cut-off voltage of 1.0V at a constant current of 0.05 CmA;
(2) injecting ink diluent (the dilution ratio: the ratio of ink to water is 1: 3) used by a pen into the battery by using an injector, wherein the amount of the injected ink diluent is 20% of the original injection amount of the battery;
(3) putting the battery filled with the ink into an oven, setting the temperature to be 45-60 ℃, and storing for 3 hours to accelerate the permeation of the color ink diluent;
(4) after high-temperature storage, the battery is disassembled, the dyed layer surface of the lug part is observed, and the dyed layer surface is the root cause of the leakage.
Example 3:
a method for detecting leakage of a tab glue part of a soft package lithium ion battery comprises the following steps:
(1) discharging the battery, namely discharging the battery to cut-off voltage of 1.5V at a constant current of 0.1CmA, and then discharging the battery to cut-off voltage of 0.5V at a constant current of 0.05 CmA;
(2) injecting ink diluent (the dilution ratio: the ratio of ink to water is 1: 5) used by a pen into the battery by using an injector, wherein the injection ink diluent is 10% of the original injection amount of the battery;
(3) putting the battery filled with the ink into an oven, setting the temperature to be 45-60 ℃, and storing for 4 hours to accelerate the permeation of the color ink diluent;
(4) after high-temperature storage, the battery is disassembled, the dyed layer surface of the lug part is observed, and the dyed layer surface is the root cause of the leakage.
Fig. 3 is an example of a pattern of a battery tab portion after liquid leakage and dyeing, which is detected in embodiment 1 of the present invention. And a dyeing area is shown as a circle range of the figure, the dyeing area is not positioned at the edge of the tab, and the reason is judged to be that the glue melting is poor during packaging.
The method can quickly and accurately judge the leakage at the tab glue position due to any defect of poor glue melting of the aluminum plastic film and the tab glue, delamination of the tab glue and a metal belt, self delamination of the tab glue, foreign matter clamping of top seal and the like, and can quickly and accurately judge whether the defect is a packaging defect or a tab incoming material defect; according to the invention, the leakage defect position of the tab glue part of the soft package lithium ion battery is dyed, so that the hierarchy is clear, and the taking of photos and the judgment of responsibility are facilitated.
The technical solutions provided by the embodiments of the present invention are described in detail above, and specific ones are applied in the text
The principles and embodiments of the present invention are explained in detail, and the above description is only used to help understand the principles of the embodiments of the present invention; while the invention has been described with reference to specific embodiments and applications, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (2)
1. A method for detecting leakage of a tab glue part of a soft package lithium ion battery is characterized by comprising the following steps:
(1) discharging the battery, namely discharging at a constant current of 0.1CmA until the cut-off voltage is less than or equal to 2.5V, and then discharging at a constant current of 0.05CmA until the cut-off voltage is less than or equal to 1.5V;
(2) injecting ink diluent used by a pen by using an injector, wherein the amount of the injected ink diluent is 10% -30% of the original injection amount of the battery;
(3) putting the battery filled with the ink into an oven, setting the temperature to be 45-60 ℃, and storing for 2-4 hours to accelerate the permeation of the color ink diluent;
(4) after high-temperature storage, the battery is disassembled, the dyed layer surface of the lug part is observed, and the dyed layer surface is the root cause of the leakage.
2. The method for detecting the leakage of the tab glue part of the soft package lithium ion battery according to claim 1, wherein the ink is blue-black ink or pure blue ink, and the ratio of the ink to the water in a dilution ratio is 1: 5-1: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811041467.5A CN110887616A (en) | 2018-09-07 | 2018-09-07 | Method for detecting leakage of tab glue part of soft package lithium ion battery |
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| CN201811041467.5A CN110887616A (en) | 2018-09-07 | 2018-09-07 | Method for detecting leakage of tab glue part of soft package lithium ion battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697812A (en) * | 2020-12-06 | 2021-04-23 | 连云港海创电子科技有限公司 | Method for detecting permeation of polymer tab |
| CN113848022A (en) * | 2021-09-24 | 2021-12-28 | 广东国鸿氢能科技有限公司 | Method for testing leakage position of graphite bipolar plate for fuel cell and method for detecting leakage of graphite bipolar plate |
| CN114112202A (en) * | 2020-08-28 | 2022-03-01 | 深圳格林德能源集团有限公司 | Method for analyzing packaging reliability of button cell |
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2018
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| CN2665058Y (en) * | 2003-11-17 | 2004-12-22 | 河南环宇集团有限公司 | Soft package lithium ion battery with leak-proof sealing electrode ears |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114112202A (en) * | 2020-08-28 | 2022-03-01 | 深圳格林德能源集团有限公司 | Method for analyzing packaging reliability of button cell |
| CN112697812A (en) * | 2020-12-06 | 2021-04-23 | 连云港海创电子科技有限公司 | Method for detecting permeation of polymer tab |
| CN113848022A (en) * | 2021-09-24 | 2021-12-28 | 广东国鸿氢能科技有限公司 | Method for testing leakage position of graphite bipolar plate for fuel cell and method for detecting leakage of graphite bipolar plate |
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Application publication date: 20200317 |
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