CN112798192A - Method for detecting encapsulation tightness of lithium ion battery cell - Google Patents
Method for detecting encapsulation tightness of lithium ion battery cell Download PDFInfo
- Publication number
- CN112798192A CN112798192A CN202011508242.3A CN202011508242A CN112798192A CN 112798192 A CN112798192 A CN 112798192A CN 202011508242 A CN202011508242 A CN 202011508242A CN 112798192 A CN112798192 A CN 112798192A
- Authority
- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- battery cell
- power supply
- layer
- 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.)
- Pending
Links
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 57
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005538 encapsulation Methods 0.000 title claims description 6
- 239000010410 layer Substances 0.000 claims abstract description 74
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 28
- 229910000366 copper(II) sulfate Inorganic materials 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 239000012785 packaging film Substances 0.000 claims abstract description 20
- 229920006280 packaging film Polymers 0.000 claims abstract description 20
- 239000005025 cast polypropylene Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000011241 protective layer Substances 0.000 claims abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- 230000008021 deposition Effects 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 11
- 229920006255 plastic film Polymers 0.000 description 6
- 239000002985 plastic film Substances 0.000 description 6
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 238000009713 electroplating Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for detecting the sealing performance of a lithium ion battery package, wherein the lithium ion battery package comprises a packaging film, the packaging film comprises an outer layer, a middle layer and an inner layer, the outer layer is a protective layer, the middle layer is an aluminum layer, and the inner layer is a cast polypropylene film, and the method comprises the following steps: s1, immersing the packaged lithium ion battery cell into water or CuSO4 solution; s2, electrically connecting the negative electrode of the power supply with liquid water or electrically connecting the negative electrode of the power supply with CuSO4 solution; and S3, electrically connecting the anode of the power supply with the aluminum layer of the packaging film. Compared with the prior art, if the sealing performance of the lithium ion cell package is poor, namely, the cast polypropylene film of the lithium ion cell is broken, the lithium ion cell package can be accurately detected, and therefore the packaging yield of the lithium ion cell is improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for detecting the sealing performance of a lithium ion cell package.
Background
The packaging film of the soft package lithium ion battery generally comprises three layers, wherein the outer layer is a nylon layer, the middle layer is an aluminum layer, the inner layer is a CPP layer, and the CPP film is a cast polypropylene film; when the battery core is packaged badly, the CPP layer of the packaging film is broken, the insulation effect is lost, the aluminum layer is exposed and is contacted with the internal substances of the battery, and on one hand, the aluminum layer of the packaging film and the negative electrode form an electronic short circuit channel; on the other hand, the aluminum layer of the packaging film forms an ion short circuit channel with the negative electrode through the electrolyte, so that the aluminum layer of the packaging film forms a short circuit loop with the negative electrode, and the negative electrode is at a low potential part and once the aluminum layer is contacted with the aluminum, an electrochemical reaction and a chemical reaction are caused through the electrolyte with higher conductivity, and the aluminum layer is continuously consumed. Moisture in the air can enter the interior of the battery cell to further react to generate a large amount of gas, so that battery inflation and corrosion leakage are caused.
Therefore, the tightness test of the soft package lithium ion battery cell package is essential.
Disclosure of Invention
The invention aims to provide a method for detecting the sealing performance of lithium ion cell packaging, which can accurately detect the breakage of a cast polypropylene film of a lithium ion cell if the sealing performance of the lithium ion cell packaging is poor, so that the packaging yield of the lithium ion cell is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for detecting the encapsulation tightness of a lithium ion battery cell, wherein the lithium ion battery cell comprises a packaging film, the packaging film comprises an outer layer, a middle layer and an inner layer, the outer layer is a protective layer, the middle layer is an aluminum layer, and the inner layer is a cast polypropylene film, and the method comprises the following steps:
s1, immersing the packaged lithium ion battery cell into liquid water or CuSO4 solution;
s2, electrically connecting the negative electrode of the power supply with liquid water or electrically connecting the negative electrode of the power supply with CuSO4 solution;
s3, electrically connecting the anode of the power supply with the aluminum layer of the packaging film;
if the packaged lithium ion battery cell is immersed in water in the step S1, and the negative electrode of the power supply is electrically connected with the liquid water in the step S2, finding a poor sealing position of the lithium ion battery cell according to the bubble generating position; if the packaged lithium ion battery cell is immersed in the CuSO4 solution in the step S1 and the negative electrode of the power supply is electrically connected with the CuSO4 solution in the step S2, a poor sealing position of the lithium ion battery cell is found according to the position of copper deposition.
Preferably, in the S1 step, the concentration of the CuSO4 solution is 20%.
Preferably, in the step S2, the energization time of the power supplier is 20 to 60 minutes.
Preferably, in step S1, the lithium ion battery cell is packaged into a rectangular body.
Preferably, in the S2 step, the power supply is a 6V constant voltage power supply.
The invention has at least the following beneficial effects:
1. if the encapsulated lithium ion battery cell is immersed in water in the step S1 and the negative electrode of the power supply is electrically connected to the liquid water in the step S2, it is known from the theory of electrolysis of water that H2 and O2 are generated when water is electrolyzed in the conductive path when the power supply is electrically detected; according to the principle, if the sealing is poor, namely the cast polypropylene film is broken, the aluminum layer is exposed, the exposed aluminum layer is contacted with water, the aluminum layer of the aluminum-plastic film is conducted with the water and is electrically connected with the aluminum layer through the positive electrode conducting wire of the power supply, the negative electrode conducting wire of the power supply is electrically connected with the water, and after the power is on, the decomposition reaction of the water is inevitably generated at the exposed part of the aluminum layer, namely the broken part of the cast polypropylene film to generate gas; h2 and O2 generated are not easy to dissolve in water, so that bubbles are generated certainly; therefore, according to the method, when bubbles are generated, the sealing effect of the lithium ion battery cell package is poor, and the position can be judged; otherwise, the absence of the bubbles indicates that the sealing effect of the lithium ion battery cell package is good.
2. If the packaged lithium ion battery cell is immersed in the CuSO4 solution in the step S1, and the cathode of the power supply is electrically connected with the CuSO4 solution in the step S2, when the power supply is electrified, the active performance of aluminum is greater than that of copper according to the electroplating principle, so that 20% of the CuSO4 solution is injected into the aluminum-plastic film by using the same device for water electrolysis, if the sealing is poor, namely the cast polypropylene film is broken, the aluminum layer is exposed, the exposed aluminum layer is contacted with the CuSO4 solution, the aluminum layer of the aluminum-plastic film is conducted with the CuSO4 solution and is electrically connected with the aluminum layer through the positive electrode conducting wire of the power supply, the negative electrode conducting wire of the power supply is electrically connected with the CuSO4 solution, and after the electrification, the copper is separated out at the conducting position of the aluminum layer and the CuSO4 solution; therefore, during electroplating, the air tightness effect of the battery package can be judged by observing whether copper is precipitated, and when copper is precipitated, the air tightness effect of the lithium ion battery package is poor and the position of the lithium ion battery package can be judged; otherwise, no copper is precipitated, which indicates that the sealing effect of the lithium ion battery cell package is good.
Detailed Description
The present invention will be described in further detail below, but the present invention is not limited thereto.
Example 1:
a method for detecting the encapsulation tightness of a lithium ion battery cell, wherein the lithium ion battery cell comprises a packaging film, the packaging film comprises an outer layer, a middle layer and an inner layer, the outer layer is a protective layer, the middle layer is an aluminum layer, and the inner layer is a cast polypropylene film, and the method comprises the following steps:
s1, immersing the packaged lithium ion battery cell into liquid water, and filling the liquid water into a container;
s2, electrically connecting the negative electrode of the power supply with the liquid water;
s3, electrically connecting the anode of the power supply with the aluminum layer of the packaging film;
preferably, in the step S2, the energization time of the power supplier is 20 to 60 minutes.
Preferably, in step S1, the lithium ion battery cell is packaged into a rectangular body.
Preferably, in the S2 step, the power supply is a 6V constant voltage power supply.
The working principle of the embodiment 1 of the invention is as follows:
when the power supply is electrified and detected, the theory of electrolysis of water shows that H2 and O2 are generated when the water is electrolyzed in the conductive path; according to the principle, if the sealing is poor, namely the cast polypropylene film is broken, the aluminum layer is exposed, the exposed aluminum layer is contacted with water, the aluminum layer of the aluminum-plastic film is conducted with the water and is electrically connected with the aluminum layer through the positive electrode conducting wire of the power supply, the negative electrode conducting wire of the power supply is electrically connected with the water, and after the power is on, the decomposition reaction of the water is inevitably generated at the exposed part of the aluminum layer, namely the broken part of the cast polypropylene film to generate gas; h2 and O2 generated are not easy to dissolve in water, so that bubbles are generated certainly; therefore, according to the method, when bubbles are generated, the sealing effect of the lithium ion battery cell package is poor, and the position can be judged, wherein the position is the poor insulation position; otherwise, the absence of the bubbles indicates that the sealing effect of the lithium ion battery cell package is good.
Example 2:
a method for detecting the encapsulation tightness of a lithium ion battery cell, wherein the lithium ion battery cell comprises a packaging film, the packaging film comprises an outer layer, a middle layer and an inner layer, the outer layer is a protective layer, the middle layer is an aluminum layer, and the inner layer is a cast polypropylene film, and the method comprises the following steps:
s1, immersing the packaged lithium ion battery cell into CuSO4 solution, and filling the CuSO4 solution into a container;
s2, electrically connecting the negative electrode of the power supply with the CuSO4 solution;
s3, electrically connecting the anode of the power supply with the aluminum layer of the packaging film;
preferably, in the S1 step, the concentration of the CuSO4 solution is 20%.
Preferably, in the step S2, the energization time of the power supplier is 20 to 60 minutes.
Preferably, in step S1, the lithium ion battery cell is packaged into a rectangular body.
Preferably, in the S2 step, the power supply is a 6V constant voltage power supply.
The working principle of the embodiment 2 of the invention is as follows:
when the power supply is electrified, according to the electroplating principle, the active performance of aluminum is greater than that of copper, so that by using the same device for water electrolysis, 20% of CuSO4 solution is injected into the aluminum-plastic film, if the sealing is poor, namely the cast polypropylene film is broken, the aluminum layer is exposed, the exposed aluminum layer is contacted with the CuSO4 solution, the aluminum layer of the aluminum-plastic film is conducted with the CuSO4 solution and is electrically connected with the aluminum layer through the positive electrode conducting wire of the power supply, the negative electrode conducting wire of the power supply is electrically connected with the CuSO4 solution, and after the power supply is electrified, copper is separated out at the conducting part of the aluminum layer and the CuSO4 solution; therefore, during electroplating, the air tightness effect of the battery package can be judged by observing whether copper is separated out, when copper is separated out, the air tightness effect of the lithium ion battery package is poor, and the position of the lithium ion battery package can be judged, wherein the position is the poor insulation position; otherwise, no copper is precipitated, which indicates that the sealing effect of the lithium ion battery cell package is good.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (5)
1. A method for detecting the encapsulation tightness of a lithium ion battery cell comprises a packaging film, wherein the packaging film comprises an outer layer, a middle layer and an inner layer, the outer layer is a protective layer, the middle layer is an aluminum layer, and the inner layer is a cast polypropylene film, and is characterized by comprising the following steps:
s1, immersing the packaged lithium ion battery cell into water or CuSO4 solution;
s2, electrically connecting the negative electrode of the power supply with liquid water or electrically connecting the negative electrode of the power supply with CuSO4 solution;
s3, electrically connecting the anode of the power supply with the aluminum layer of the packaging film;
if the packaged lithium ion battery cell is immersed in water in the step S1, and the negative electrode of the power supply is electrically connected with the liquid water in the step S2, finding a poor sealing position of the lithium ion battery cell according to the bubble generating position; if the packaged lithium ion battery cell is immersed in the CuSO4 solution in the step S1 and the negative electrode of the power supply is electrically connected with the CuSO4 solution in the step S2, a poor sealing position of the lithium ion battery cell is found according to the position of copper deposition.
2. The method for detecting the sealing performance of the lithium ion battery cell package according to claim 1, wherein in the step S1, the concentration of the CuSO4 solution is 20%.
3. The method for detecting the sealing performance of the lithium ion battery cell package according to claim 1 or 2, wherein in the step S2, the power supply is powered on for 20 to 60 minutes.
4. The method for detecting the sealing performance of the lithium ion battery cell package according to claim 1 or 2, wherein in the step S1, the lithium ion battery cell is packaged into a rectangular body.
5. The method for detecting the sealing performance of a lithium ion battery cell package according to claim 1 or 2, wherein in the step S2, the power supply is a 6V constant voltage power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011508242.3A CN112798192A (en) | 2020-12-18 | 2020-12-18 | Method for detecting encapsulation tightness of lithium ion battery cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011508242.3A CN112798192A (en) | 2020-12-18 | 2020-12-18 | Method for detecting encapsulation tightness of lithium ion battery cell |
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| Publication Number | Publication Date |
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| CN112798192A true CN112798192A (en) | 2021-05-14 |
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| CN202011508242.3A Pending CN112798192A (en) | 2020-12-18 | 2020-12-18 | Method for detecting encapsulation tightness of lithium ion battery cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113945335A (en) * | 2021-10-14 | 2022-01-18 | 湖南兴旭能新能源科技有限公司 | Device and method for detecting encapsulation tightness of lithium ion battery cell |
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| JP2016195042A (en) * | 2015-03-31 | 2016-11-17 | 大日本印刷株式会社 | Battery manufacturing method |
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| CN107515081A (en) * | 2017-09-26 | 2017-12-26 | 江苏双登富朗特新能源有限公司 | Lithium ion battery aluminum plastic film package quality fast positioning detection means |
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2020
- 2020-12-18 CN CN202011508242.3A patent/CN112798192A/en active Pending
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| CN103033543A (en) * | 2011-09-30 | 2013-04-10 | 深圳市海盈科技有限公司 | Method for detecting damage of aluminum plastic membrane shell used for lithium ion battery |
| US20140285208A1 (en) * | 2011-12-05 | 2014-09-25 | Automotive Energy Supply Corporation | Method for inspecting battery |
| CN202434655U (en) * | 2011-12-28 | 2012-09-12 | 天津力神电池股份有限公司 | Polymer lithium ion battery aluminum-plastic membrane damage detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113945335A (en) * | 2021-10-14 | 2022-01-18 | 湖南兴旭能新能源科技有限公司 | Device and method for detecting encapsulation tightness of lithium ion battery cell |
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Application publication date: 20210514 |
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