CN110440989B - Method for evaluating lithium ion battery sealing performance - Google Patents
Method for evaluating lithium ion battery sealing performance Download PDFInfo
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- CN110440989B CN110440989B CN201910740100.0A CN201910740100A CN110440989B CN 110440989 B CN110440989 B CN 110440989B CN 201910740100 A CN201910740100 A CN 201910740100A CN 110440989 B CN110440989 B CN 110440989B
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- 238000007789 sealing Methods 0.000 title claims abstract description 44
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000004880 explosion Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 9
- 238000011156 evaluation Methods 0.000 abstract description 3
- 208000034189 Sclerosis Diseases 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a method for evaluating the sealing performance of a lithium ion battery, which comprises the following steps: step S10, providing a battery to be evaluated, wherein the battery comprises a cap, and the cap is provided with an explosion-proof score; step S20, firstly, hardening the surface of the cap corresponding to the position of the anti-explosion notch, then filling high-pressure gas into the bottom or the side of the battery, and detecting whether the sealing position of the battery leaks gas or not, if so, the sealing performance of the battery is unqualified, and if not, the sealing performance of the battery is qualified. The evaluation method can detect the tightness of the battery under higher air pressure in the process of the pressing test, and avoids the nicks on the cap from being broken.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method for evaluating the sealing performance of a lithium ion battery.
Background
The sealing performance is a key characteristic of the lithium ion battery, and the poor sealing performance can cause the lithium ion battery to have a risk of leakage, so that the sealing position of the lithium ion battery needs to be tested after the lithium ion battery is sealed. The pressing test is one of the methods for testing the sealing performance of the lithium ion battery commonly used in the prior art, wherein the specific method of the pressing test is as follows: and filling high-pressure gas into the battery at the bottom or the side wall of the battery, and then detecting whether the battery has the phenomenon of gas leakage. However, in order to prevent explosion of the lithium ion battery, a cap of the lithium ion battery is usually provided with a notch. During the pressurizing test, the charged air pressure cannot be too large, otherwise, the nicks of the cap can be broken, so that the existence of the nicks greatly limits the air pressure of the lithium ion battery charged in the battery during the pressurizing test.
Disclosure of Invention
The invention aims to: the method for evaluating the tightness of the lithium ion battery is provided, the tightness of the battery can be detected under higher air pressure in the process of a pressing test, and the nicks on the cap are prevented from being broken.
In order to achieve the purpose, the invention adopts the following technical scheme:
provided is a method for evaluating the tightness of a lithium ion battery, which comprises the following steps:
step S10, providing a battery to be evaluated, wherein the battery comprises a cap, and the cap is provided with an explosion-proof score;
step S20, firstly, hardening the surface of the cap corresponding to the position of the anti-explosion notch, then filling high-pressure gas into the bottom or the side of the battery, and detecting whether the sealing position of the battery leaks gas or not, if so, the sealing performance of the battery is unqualified, and if not, the sealing performance of the battery is qualified.
As a preferable technical solution of the method for evaluating the sealing performance of the lithium ion battery, in step S20, a surface of the cap corresponding to the position of the explosion-proof notch is hardened by using a cold insert.
As a preferable technical solution of the method for evaluating the sealing performance of the lithium ion battery, the step S20 specifically includes the steps of S21, heating the cold insert to change the cold insert from a solid state to a liquid state;
and S22, coating the liquid cold embedding material on the surface of the cap corresponding to the position of the anti-explosion notch to form a hardened layer.
As a preferable technical solution of the method for evaluating the sealing performance of the lithium ion battery, the thickness of the hardened layer is greater than or equal to the depth of the explosion-proof notch.
As a preferable technical solution of the method for evaluating the sealing performance of the lithium ion battery, the hardened layer extends from the opening of the explosion-proof notch toward a direction away from the explosion-proof notch.
As a preferable technical solution of the method for evaluating the sealability of a lithium ion battery, the hardened layer covers a side surface of the cap away from the battery cell.
As a preferable technical solution of the method for evaluating the sealing performance of the lithium ion battery, in step S20, the liquid cold insert is coated on the anti-explosion notch, and after the interval time is 10-30 min, high-pressure gas is filled in the bottom or the side of the battery.
As a preferred embodiment of the method for evaluating the sealability of a lithium ion battery, it is determined that the liquefied cold insert is completely hardened on the cap before the interior of the battery is filled with high-pressure gas.
As a preferable technical solution of the method for evaluating the sealing performance of the lithium ion battery, in the step S20, after the bottom or the side wall of the battery is filled with the high-pressure gas, the pressure is maintained for 8 to 10 seconds, and then whether the battery leaks gas is detected.
As a preferable embodiment of the method for evaluating the sealing performance of the lithium ion battery, if the sealing performance of the battery is not satisfactory, the hardened layer on the explosion-proof notch is removed, and then the battery is repaired.
The invention has the beneficial effects that: because the anti-explosion nick is of a groove structure, the thickness of the cap corresponding to the anti-explosion nick is smaller than that of other positions of the cap, and when the air pressure inside the battery is larger, the anti-explosion nick is easily broken at the position corresponding to the cap. The position of the surface of the anti-explosion nick is hardened to thicken the position of the anti-explosion nick corresponding to the cap, so that the structure of the anti-explosion nick is effectively strengthened, after high-pressure gas is filled into the battery, the position of the cap corresponding to the anti-explosion nick cannot be broken, and the position between the cap and the sealing ring is extruded by air pressure. The method is used for evaluating the sealing performance of the lithium ion battery, and the sealing position of the lithium ion battery can be detected under higher air pressure during the pressurizing test, so that the risk that the position of the explosion-proof nick on the cap is broken to forcibly stop new evaluation of sealing is avoided.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 is a schematic structural diagram of the cap for sealing the sealing position of the battery.
In the figure:
1. the interior of the battery; 2. capping; 21. explosion-proof nicking; 3. and (5) sealing rings.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1, the present invention provides a method for evaluating the sealability of a lithium ion battery, comprising the following steps:
step S10, providing a battery to be evaluated, wherein the battery comprises a cap 2, and the cap 2 is provided with an explosion-proof notch 21.
Step S20, first, the surface of the cap 2 corresponding to the position of the anti-explosion notch 21 is hardened, then, high-pressure gas is filled into the bottom or the side of the battery, and whether the sealing of the battery leaks gas or not is detected, if so, the sealing of the battery is not qualified, and if not, the sealing of the battery is qualified.
Specifically, in step S20, after the high-pressure gas is filled into the bottom or the side wall of the battery, the pressure is maintained for 8 to 10 seconds, and then whether the battery leaks gas is detected.
Because the explosion-proof nick 21 is the groove structure, the cap 2 is less than the other positions of the cap 2 corresponding to the thickness of the explosion-proof nick 21, and when the air pressure in the battery is larger, the explosion-proof nick 21 is easily broken at the position corresponding to the cap 2. The surface of the anti-explosion nick 21 is hardened to thicken the anti-explosion nick 21 at the position corresponding to the cap 2, so that the structure of the anti-explosion nick 21 is effectively strengthened, after the high-pressure gas is filled in the battery 1, the position of the cap 2 corresponding to the anti-explosion nick 21 cannot be broken, and the position between the cap 2 and the sealing ring 3 is extruded by the air pressure. By using the method to evaluate the sealing performance of the lithium ion battery, the sealing position of the lithium ion battery can be detected under higher air pressure during the pressurizing test, and the risk that the sealing performance evaluation is forcibly stopped due to the fact that the position of the explosion-proof nick 21 on the cap 2 is broken is avoided.
In step S20, the surface of the cap 2 corresponding to the position of the explosion-proof score 21 is hardened by using a cold setting material.
The step S20 specifically includes a step S21 of heating the cold insert to change the cold insert from a solid state to a liquid state.
Step S22, coating the liquid cold setting compound on the surface of the cap 2 corresponding to the position of the explosion-proof notch 21 to form a hardened layer (the hardened layer is not shown in fig. 1).
The cold embedding material can be converted from a solid state into a liquid state in a high-temperature environment and can be converted from the liquid state into the solid state at a low normal temperature, and the surface of the cap 2 corresponding to the position of the anti-explosion notch 21 is conveniently hardened by utilizing the characteristic of the cold embedding material.
In order to reinforce the structural strength of the hardened layer, the thickness of the hardened layer is greater than or equal to the depth of the explosion-proof score 21.
In one embodiment, the sclerosis layer is kept away from by the opening part orientation of explosion-proof nick 21 the direction extension of explosion-proof nick 21, and this design, multiplicable the sclerosis layer with the area of contact of block 2 improves and should harden the bonding strength of layer to block 2, avoids the sclerosis layer to break away from block 2 at the in-process of aassessment.
Preferably, the hardened layer covers a side of the cap 2 away from the battery core.
In another embodiment, in the step S20, the liquid cold insert is coated on the explosion-proof score 21, and after the interval of time is 10-30 min, high-pressure gas is filled into the bottom or the side of the battery. In the embodiment, after the liquid cold insert is coated for 10-30 min, high-pressure gas is filled into the battery 1, so as to ensure that the liquid cold insert is completely solid and prevent only part of the cold insert from being hardened due to too short time.
Preferably, it is determined that the liquefied cold inlay is completely hardened on the cap 2 before the interior 1 of the battery is filled with high-pressure gas.
In this embodiment, if the sealing performance of the battery is not satisfactory, the hardened layer on the explosion-proof notch 21 is removed, and the battery is repaired. The qualified rate of the sealing performance of the battery is improved by repairing the battery.
It should be noted that the method for evaluating the lithium ion battery sealing performance is not only suitable for detecting the sealing performance of a cylindrical lithium ion battery, but also suitable for detecting the sealing performance of other types of lithium ion batteries, such as rectangular lithium ion batteries, and the like, and the type of the lithium ion battery is not limited herein.
In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A method of evaluating the sealability of a lithium ion battery comprising the steps of:
step S10, providing a battery to be evaluated, wherein the battery comprises a cap, and the cap is provided with an explosion-proof score;
step S20, firstly, hardening the surface of the cap corresponding to the position of the anti-explosion notch, then filling high-pressure gas into the bottom or the side of the battery, and detecting whether the sealing position of the battery leaks gas or not, if so, the sealing performance of the battery is unqualified, and if not, the sealing performance of the battery is qualified.
2. The method for evaluating the sealability of a lithium ion battery according to claim 1, wherein in step S20, the surface of the cap corresponding to the position of the explosion-proof notch is hardened by using a cold insert.
3. The method for evaluating the sealability of lithium ion batteries according to claim 2, wherein the step S20 specifically comprises the steps of S21, heating the cold insert to change the cold insert from a solid state to a liquid state;
and S22, coating the liquid cold embedding material on the surface of the cap corresponding to the position of the anti-explosion notch to form a hardened layer.
4. The method of claim 3, wherein the hardened layer has a thickness greater than or equal to the depth of the explosion-proof score.
5. The method of claim 3, wherein the hardened layer extends from the opening of the explosion-proof score towards a direction away from the explosion-proof score.
6. The method of claim 5, wherein the hardened layer covers a side of the cap away from the cell of the battery.
7. The method for evaluating the sealability of a lithium ion battery according to claim 3, wherein in step S20, the cold insert in liquid state is coated on the anti-explosion nicks, and after the time interval of 10-30 min, high-pressure gas is filled in the bottom or the side of the battery.
8. The method of claim 7, wherein the liquefied cold insert is determined to be completely hardened on the cap before the interior of the battery is filled with high pressure gas.
9. The method according to claim 1, wherein in step S20, after the high-pressure gas is filled into the bottom or the side wall of the battery and the pressure is maintained for 8-10S, the battery is tested for leakage.
10. The method for evaluating the sealability of a lithium ion battery according to any one of claims 1 to 9, wherein if the sealability of the battery is not qualified, the hardened layer on the explosion-proof notch is removed, and then the battery is repaired.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910740100.0A CN110440989B (en) | 2019-08-12 | 2019-08-12 | Method for evaluating lithium ion battery sealing performance |
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| CN201910740100.0A CN110440989B (en) | 2019-08-12 | 2019-08-12 | Method for evaluating lithium ion battery sealing performance |
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| CN110440989B true CN110440989B (en) | 2021-04-09 |
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| CN111735707A (en) * | 2020-06-29 | 2020-10-02 | 天津市捷威动力工业有限公司 | Method and device for testing packaging strength of lithium ion soft package battery |
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| CN101464204A (en) * | 2007-12-19 | 2009-06-24 | 深圳市比克电池有限公司 | Lithium ion battery sealing property detection apparatus and detection method using the same |
| CN203428158U (en) * | 2012-06-07 | 2014-02-12 | 皇冠包装技术公司 | Easy open closure with improved pressure performance |
| CN108369972A (en) * | 2015-12-01 | 2018-08-03 | 太阳能公司 | Multioperation tool for photovoltaic cell processing |
| CN110031162A (en) * | 2019-03-15 | 2019-07-19 | 湖北三江航天万峰科技发展有限公司 | A kind of Fragile cap is airtight and breaks through experimental rig and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050028480A1 (en) * | 1999-10-04 | 2005-02-10 | Lasusa Frank | Reinforcing structure for a window frame system |
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| CN101464204A (en) * | 2007-12-19 | 2009-06-24 | 深圳市比克电池有限公司 | Lithium ion battery sealing property detection apparatus and detection method using the same |
| CN203428158U (en) * | 2012-06-07 | 2014-02-12 | 皇冠包装技术公司 | Easy open closure with improved pressure performance |
| CN108369972A (en) * | 2015-12-01 | 2018-08-03 | 太阳能公司 | Multioperation tool for photovoltaic cell processing |
| CN110031162A (en) * | 2019-03-15 | 2019-07-19 | 湖北三江航天万峰科技发展有限公司 | A kind of Fragile cap is airtight and breaks through experimental rig and method |
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| Title |
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| 液态软包装锂离子电池工艺及电化学性能研究;刘圣迁;《中国优秀博硕士学位论文全文数据库 (硕士) 工程科技Ⅱ辑》;20050315(第1期);第C042-450页 * |
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