CN112186280A - Method for detecting leakage of lithium ion battery module - Google Patents
Method for detecting leakage of lithium ion battery module Download PDFInfo
- Publication number
- CN112186280A CN112186280A CN202011085154.7A CN202011085154A CN112186280A CN 112186280 A CN112186280 A CN 112186280A CN 202011085154 A CN202011085154 A CN 202011085154A CN 112186280 A CN112186280 A CN 112186280A
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- Prior art keywords
- module
- vacuum
- vacuum box
- battery module
- insulation
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- 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
-
- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
Abstract
The invention provides a method for detecting leakage of a lithium ion battery module, which belongs to the field of lithium batteries and comprises the following steps: putting the module into a vacuum box, inverting the battery module, and horizontally placing the battery module in the vacuum box padded with an insulating plate; step two: vacuumizing, closing a vacuum box door, setting operation parameters, pressing a start button after the setting is finished, and automatically vacuumizing the vacuum box → maintaining pressure → releasing vacuum; step three: the module is taken out of the vacuum box, after the vacuum is released, the door of the vacuum box is opened, the module is taken out, and the module is placed on the tray with the front side facing upwards; step four: and (3) testing insulation, judging whether the insulation is qualified or not, setting the gear of the insulation test meter to be 1000V, and judging whether the insulation is qualified or not according to the resistance value by using a total positive terminal or a total negative terminal of one contact module and a metal shell of the other contact module. The invention breaks through the traditional insulation mode of the module, realizes a new leakage detection mode by utilizing the vacuum principle, and has higher detection efficiency and more reliability for the leakage of the battery in the module.
Description
Technical Field
The invention belongs to the field of batteries, relates to a lithium ion battery of a new energy automobile, and particularly relates to a method for detecting leakage of a lithium ion battery module.
Background
When present battery assembled into the module, can carry out the insulation test of electric core and module shell for judge whether the battery weepes or whether there is the short circuit problem. Because the battery leakage generally is that the battery packing has the hole of small-size, electrolyte can flow out at very slow speed, if electrolyte does not reach the shell during insulation test, then the abnormal battery can't effectively be locked in insulation test, above-mentioned condition leads to unqualified product to flow out, in the in-process of actual market application, has the potential safety hazard, and light then arouses certain economic loss, and serious, the product quality of enterprise, the image of enterprise, influence user's safety in utilization even, therefore in time and accurately judge battery leakage or short circuit condition before dispatching from the factory crucial.
In the prior art, the detection and discrimination of the leakage can not be carried out quickly, and no better method is provided.
Disclosure of Invention
The invention aims to solve the problem of providing a method for detecting the leakage of a lithium ion battery module, breaking through the traditional insulation mode of the module, realizing a new leakage detection mode by using the vacuum principle, and having higher detection efficiency and more reliability for the leakage of the battery in the module.
In order to solve the technical problems, the invention adopts the technical scheme that: the method for detecting the leakage of the lithium ion battery module comprises the following steps,
the method comprises the following steps: putting the module into a vacuum box, inverting the battery module, and horizontally placing the battery module in the vacuum box padded with an insulating plate;
step two: vacuumizing, closing a vacuum box door, setting operation parameters, pressing a start button after the setting is finished, and automatically vacuumizing the vacuum box → maintaining pressure → releasing vacuum;
step three: the module is taken out of the vacuum box, after the vacuum is released, the door of the vacuum box is opened, the module is taken out, and the module is placed on the tray with the front side facing upwards;
step four: and testing insulation, judging whether the insulation is qualified or not, setting the gear of the insulation test meter to be 1000V, setting one insulation test meter pen to be in contact with the total positive terminal or the total negative terminal of the module, and judging whether the insulation is qualified or not according to the resistance value of the metal shell of the other insulation test meter pen to be in contact with the module.
Further, in the first step, the die set is kept still in the vacuum box for 5-10 minutes.
Further, in the second step, the vacuum degree is-50 kPa, the temperature is kept for 5-10 minutes, and the heating is closed.
Further, in the second step, the vacuum degree of the soft package battery module is-40 kPa to-55 kPa; the degree of vacuum of the aluminum-shell battery module is-40 kPa to-60 kPa.
Further, in step three, be equipped with the bubble cotton between tray and the module, the transport operation avoids causing module outward appearance fish tail.
Furthermore, in the fourth step, the left hand and the right hand respectively hold one insulation test meter, and the operator wears the shaft sleeves with both hands to operate, so that the condition that the insulation test meter is larger than 3M omega is prevented from being qualified.
Further, in the first step, a plurality of modules are simultaneously placed in the vacuum box, and the volume of the modules accounts for 70% -90% of the internal volume of the vacuum box.
Compared with the prior art, the invention has the following advantages and positive effects.
1. The vacuumizing method is applied to leakage detection of the lithium ion battery module, and a vacuum acceleration method is introduced, so that the accuracy and effectiveness of insulation detection are improved.
2. The invention breaks through the traditional insulation mode of the module, the leakage cannot flow out even if the conventional upward placement is adopted, the leakage cannot flow out by overcoming the gravity even if the vacuum is utilized, the battery module is damaged due to the overlarge negative pressure, the existing technical means cannot be discriminated and detected, and the control can be only carried out from the production process.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in relative terms of orientation or position to facilitate describing the invention and to simplify the description, but 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 thus, are not to be considered limiting of the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The following is a detailed description of specific embodiments of the invention.
The method for detecting the leakage of the lithium ion battery module comprises the following steps:
the method comprises the following steps: the module is put into a vacuum box, the battery module is inverted, namely the front surface of the battery module faces downwards, the battery module is horizontally placed in the vacuum box padded with an insulating plate, the module is arranged in the vacuum box in the middle, no special requirement is required for the vacuum box in the application, the vacuum box commonly used in the market can realize the technical scheme in the application, and the cavity in the vacuum box is ensured to be larger than the shape of the module; in the practical application process, the modules are of a conventional square structure, a plurality of modules can be placed in the vacuum box for testing at the same time, and the proportion of the volume of the modules in the volume of the vacuum box is 70% -90% which is the best choice.
Step two: vacuumizing, closing a vacuum box door, setting operation parameters, pressing a start button after the setting is finished, and automatically vacuumizing the vacuum box → maintaining pressure → releasing vacuum; and keeping the vacuum degree at 50kPa for 5-10 minutes to ensure that the electrolyte of the leakage battery flows out and contacts with the module shell, heating and closing the leakage battery after the time is over, easily flowing out the electrolyte when the battery with a defective hole at the upper part of the module is inverted under the action of gravity to play a role in acceleration, wherein the defective hole is generally caused by puncturing of a sharp foreign matter, the size of the hole is generally 0.5-5mm, and in the step, the required vacuum degree is not too high to prevent the normal battery from being pumped out and expanded.
Step three: the module is taken out of the vacuum box, after the vacuum is released, the door of the vacuum box is opened, the module is taken out, and the module is placed on the tray with the front side facing upwards;
step four: survey insulating, judge whether qualified product, set up insulating test table gear into 1000V, an insulating test table pen contact module always just or total negative terminal, another insulating test table pen contact module's metal casing judges insulating whether qualified according to the resistance, respectively holds an insulating test table about, and the operator both hands wear the axle sleeve and operate, and it is qualified to prevent to be greater than 3M omega.
Preferably, in the step one, the module stands still for 5-10 minutes in the vacuum box, which is beneficial to the mechanism of quick electro-hydraulic outflow of battery leakage, the assembled module is inverted, and the module stands still for a certain time in vacuum, so that the problem of insulation misjudgment caused by slow outflow of electrolyte is solved.
Preferably, in step three, be equipped with the bubble cotton between tray and the module, the transport operation avoids causing module outward appearance fish tail.
In the in-process of in-service use, the processing object is the battery module that the equipment finishes, and the processing tool is automatic vacuum box, can set for vacuum degree, automatic hold time, possesses automatic evacuation, keeps automatic timing, automatic pressure release, alarm function when, and the testing tool is the insulation test table, through surveying whether switch on battery and module metal casing in the module, confirms whether there is the battery weeping to take place.
1. Module equipment processing, module equipment processing is generally automatic line production at present, including automatic piling up, automatic weld, automatic test, artifical supplementary FFT test, does not have special requirement to the battery module of testing in this application, all uses the battery module of producing to this company's production line.
2. Module evacuation
(1) The module that will assemble is invertd, puts in the vacuum chamber that has the insulation board of pad, because the welding part of general aluminum hull battery or laminate polymer battery's encapsulation position all are located the top, and the module is invertd usable gravity and is made electrolyte easily flow out, need not to apply external force, has simplified the structure, utilizes the action of gravity, plays the effect that the weeping flows out with higher speed.
(2) After the module is placed in a vacuum box, closing a door of the vacuum box, setting the operation parameters of the vacuum box in advance, setting the vacuum degree to be-50 kPa, setting the vacuum retention time to be 5-10 minutes, pressing a start button, automatically carrying out vacuumizing operation on the vacuum box according to a program, automatically timing when the vacuum degree reaches-50 kPa, automatically releasing the pressure of equipment after the set time is reached, automatically alarming by buzzing the equipment after the pressure release is finished, selecting the vacuum degree according to the type of the battery, and setting the vacuum degree of the soft package battery module to be-40 kPa to-55 kPa; the vacuum degree of the aluminum shell battery module is-40 kPa to-60 kPa; the vacuum maintaining time of the battery and the vacuum maintaining time of the battery are consistent and are 5-10 minutes, the main principle is to avoid bulging when the battery is vacuumized, and simultaneously prevent the soft package battery from having defects of appearance wrinkles and the like after pressure relief, and the main purpose is to promote the battery with holes to quickly flow out of electrolyte and be communicated with the shell.
(3) Open the vacuum chamber door, carefully take out the module of inversion, just put in and fill up the cotton platform of bubble, notice the transport operation and avoid causing module outward appearance fish tail, wear gloves during the transport operation simultaneously, prevent that the electrolyte that flows is infected with on hand.
3. Insulation of test module
With the insulation tester, carry out insulation test to the module that vacuum processing has, set up the insulation table gear into 1000V, standard 20M omega, gloves are worn to both hands, hold two table pens and contact module metal casing and the total positive terminal of module respectively (or total negative terminal), press the table pen and test, show the figure according to the tester and judge whether insulating qualified.
The detection method is beneficial to quick and accurate selection after the battery is assembled into the module when the battery has small leakage; according to the scheme, when the vacuumizing method is used, the gravity is used for inverting the module according to the position where the leakage defect is easy to generate, and the outflow of the electrolyte of the defective battery is further accelerated.
The lithium ion battery module is that carry out the series-parallel connection with single lithium ion battery and pile and the busbar electricity is connected the back, at the outside insulating processing that carries out earlier of battery that piles up, then use metal casing to protect it, if the electrolyte that flows out in the battery, most likely electrolyte is connected a plurality of batteries, takes place the short circuit danger of striking sparks, so test insulation can effectively detect this badly, prevents that the product from taking place danger, has promoted the security greatly.
Example (b): 5 leakage modules were intentionally incorporated into 2000 modules and identified and selected by the conventional method and the method of the present invention, respectively, and the test data are shown in the following table.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (7)
1. The method for detecting the leakage of the lithium ion battery module is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
the method comprises the following steps: putting the module into a vacuum box, inverting the battery module, and horizontally placing the battery module in the vacuum box padded with an insulating plate;
step two: vacuumizing, closing a vacuum box door, setting operation parameters, pressing a start button after the setting is finished, and automatically vacuumizing the vacuum box → maintaining pressure → releasing vacuum;
step three: the module is taken out of the vacuum box, after the vacuum is released, the door of the vacuum box is opened, the module is taken out, and the module is placed on the tray with the front side facing upwards;
step four: and testing insulation, judging whether the insulation is qualified or not, setting the gear of the insulation test meter to be 1000V, setting one insulation test meter pen to be in contact with the total positive terminal or the total negative terminal of the module, and judging whether the insulation is qualified or not according to the resistance value of the metal shell of the other insulation test meter pen to be in contact with the module.
2. The lithium ion battery module leakage detection method of claim 1, characterized in that: in step one, the module is left to stand in a vacuum box for 5-10 minutes.
3. The lithium ion battery module leakage detection method of claim 1, characterized in that: in the second step, the vacuum degree is kept for 5 to 10 minutes from minus 40kPa to minus 60kPa, and the heating is closed.
4. The lithium ion battery module leakage detection method of claim 1, characterized in that: in the second step, the vacuum degree of the soft package battery module is-40 kPa to-55 kPa; the degree of vacuum of the aluminum-shell battery module is-40 kPa to-60 kPa.
5. The lithium ion battery module leakage detection method of claim 1, characterized in that: in step three, foam is arranged between the tray and the module, and the carrying operation avoids causing the appearance scratch of the module.
6. The lithium ion battery module leakage detection method of claim 1, characterized in that: in the fourth step, the left hand and the right hand respectively hold one insulation test meter, and the operator wears the shaft sleeves with both hands to operate, so that the condition that the insulation test meter is larger than 3M omega is prevented.
7. The lithium ion battery module leakage detection method of claim 1, characterized in that: in the first step, a plurality of modules are placed in the vacuum box at the same time, and the volume of the modules accounts for 70% -90% of the internal volume of the vacuum box.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011085154.7A CN112186280A (en) | 2020-10-12 | 2020-10-12 | Method for detecting leakage of lithium ion battery module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011085154.7A CN112186280A (en) | 2020-10-12 | 2020-10-12 | Method for detecting leakage of lithium ion battery module |
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| CN112186280A true CN112186280A (en) | 2021-01-05 |
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| CN202011085154.7A Pending CN112186280A (en) | 2020-10-12 | 2020-10-12 | Method for detecting leakage of lithium ion battery module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804363A (en) * | 2021-10-14 | 2021-12-17 | 湖南兴旭能新能源科技有限公司 | Lithium ion battery leak detection device |
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| CN108241127A (en) * | 2017-12-29 | 2018-07-03 | 江西省汇亿新能源有限公司 | A kind of safety detecting method of lithium battery |
| CN111610455A (en) * | 2019-02-22 | 2020-09-01 | 天津理工大学 | Safety detection method for ternary lithium ion battery |
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2020
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Patent Citations (3)
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|---|---|---|---|---|
| CN104729798A (en) * | 2015-04-02 | 2015-06-24 | 天津力神电池股份有限公司 | Battery sealing performance testing method |
| CN108241127A (en) * | 2017-12-29 | 2018-07-03 | 江西省汇亿新能源有限公司 | A kind of safety detecting method of lithium battery |
| CN111610455A (en) * | 2019-02-22 | 2020-09-01 | 天津理工大学 | Safety detection method for ternary lithium ion battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113804363A (en) * | 2021-10-14 | 2021-12-17 | 湖南兴旭能新能源科技有限公司 | Lithium ion battery leak detection device |
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Application publication date: 20210105 |