CN115902648A - Method and device for carrying out in-situ detection on gas generated by soft package battery - Google Patents
Method and device for carrying out in-situ detection on gas generated by soft package battery Download PDFInfo
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- CN115902648A CN115902648A CN202310080203.5A CN202310080203A CN115902648A CN 115902648 A CN115902648 A CN 115902648A CN 202310080203 A CN202310080203 A CN 202310080203A CN 115902648 A CN115902648 A CN 115902648A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a method and a device for carrying out in-situ detection on gas generated by a soft package battery, comprising the following steps of: the method comprises the following steps of S1, sealing and placing the soft package battery in an in-situ mold, leading out a positive lug and a negative lug of the soft package battery from the in-situ mold, and connecting the positive lug and the negative lug of the soft package battery to a charge-discharge test system; s2, placing the in-situ mold for packaging the soft package battery in ultrasonic imaging equipment, and starting a charge-discharge test system to perform charge-discharge control on the soft package battery; and S3, leading out gas generated in the charge and discharge process of the soft package battery from the in-situ mold, and introducing the gas into a differential electrochemical mass spectrometry analyzer. The invention realizes the in-situ real-time detection of positioning, qualitative and quantitative gas production of the soft package battery.
Description
Technical Field
The invention relates to the technical field of battery detection, in particular to a method and a device for carrying out in-situ detection on gas generated by a soft package battery.
Background
The existing soft package battery gas production test characterization technology mainly comprises the following steps:
1) The non-in-situ means is to extract the generated gas of the soft package battery by using an injector and inject the gas into a differential electrochemical mass spectrometer to detect the generated gas, and the technical defects are that the generated gas can only be roughly and qualitatively analyzed, the generated gas cannot be quantitatively analyzed, and the operation is complex and low in efficiency. In addition, the product is easily influenced or interfered by environmental gas during extraction and transfer, so that the test result is inaccurate;
2) The technology has the technical defects that the specific gas production position and the internal gas production dispersion condition of the soft package battery are not clear, and the gas production phenomenon and the result of the soft package battery can only be presented through data of a mass spectrometry instrument, so that the soft package battery is not visual enough and cannot be visualized.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of the gas production test characterization technology of the soft package battery in the prior art, and provide a method and a device for in-situ detection of the gas production of the soft package battery, wherein the in-situ real-time detection of the gas production of the soft package battery in positioning, qualitative and quantitative modes is realized by combining an ultrasonic imaging technology and a differential electrochemical mass spectrometry test method.
In order to solve the technical problem, the invention provides a method for carrying out in-situ detection on gas generated by a soft package battery, which comprises the following steps:
s1, sealing and placing a soft package battery in an in-situ mold, leading out positive and negative lugs of the soft package battery from the in-situ mold, and connecting the positive and negative lugs of the soft package battery to a charge and discharge test system;
s2, placing the in-situ mold for packaging the soft package battery in ultrasonic imaging equipment, and starting a charge-discharge test system to perform charge-discharge control on the soft package battery;
and S3, leading out gas generated in the charge and discharge process of the soft package battery from the in-situ mold, and introducing the gas into a differential electrochemical mass spectrometry analyzer.
In one embodiment of the present invention, in step S1, the in-situ mold includes:
the bottom plate is internally provided with a groove for bearing the soft package battery;
the sealing plate is matched with the bottom plate, locked and packaged on the bottom plate through bolts, and used for sealing the groove;
the sealing plate is provided with a tab through hole and a gas production through hole, the positive and negative tabs of the soft package battery are led out from the tab through hole, and gas produced in the charge and discharge process of the soft package battery is led out from the gas production through hole.
In one embodiment of the invention, after the positive and negative lugs are led out from the lug through holes, the lug through holes are sealed and packaged.
In one embodiment of the invention, the gas generating through hole comprises a gas inlet hole and a gas outlet hole, the gas inlet hole is communicated with a gas generating device, the gas outlet hole is communicated with the differential electrochemical mass spectrometry instrument, the gas generating device introduces carrier gas into the in-situ mold through the gas inlet hole, and the carrier gas is used for discharging gas generated in the charging and discharging processes of the soft package battery from the gas outlet hole and bringing the gas into the differential electrochemical mass spectrometry instrument.
In one embodiment of the invention, the gas generating device is used for introducing carrier gas into the in-situ mold at a constant gas flow rate through a flow controller.
In one embodiment of the invention, in step S1, the process of charging and discharging the pouch battery is set to one cycle period.
In one embodiment of the invention, in step S2, the gas generation distribution image in the charge-discharge cycle of the pouch battery is monitored by an ultrasonic imaging device.
In one embodiment of the present invention, in step S3, the flow rate and the components of the generated gas in the charging and discharging cycle of the pouch battery are monitored by a differential electrochemical mass spectrometer.
In an embodiment of the invention, the method further includes a step S4 of comparing the gas generation distribution image in the charge and discharge cycle of the flexible package battery monitored by the ultrasonic imaging device in the step S2 with the gas generation flow in the charge and discharge cycle of the flexible package battery monitored by the differential electrochemical mass spectrometer in the step S3 in terms of time, so as to obtain an accurate time point of gas generation in the charge and discharge cycle of the flexible package battery.
In order to solve the technical problem, the invention also provides a device for carrying out in-situ detection on the gas generated by the soft package battery, which is used for realizing the method.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the method and the device for carrying out in-situ detection on the gas production of the soft package battery combine an ultrasonic imaging test means and a differential electrochemical mass spectrometry test technology to realize gas production positioning, qualitative and quantitative in-situ real-time detection on the soft package battery, utilize the ultrasonic imaging technology as a visual characterization means in the gas production process of the soft package battery, can visualize the gas production position of the soft package battery and the dispersion condition of the gas production in the soft package, utilize the differential electrochemical mass spectrometry test technology as a quantitative gas production detection analysis means, and can carry out qualitative and quantitative analysis on the gas production;
in addition, the method and the device for carrying out in-situ detection on the gas generated by the soft package battery are adopted to package the soft package battery, so that the in-situ detection on the soft package battery is realized, the soft package battery is not influenced or interfered by environmental gas, the test result is accurate, the method and the device can be quickly and conveniently implemented in a production workshop of a battery factory, and meanwhile, valuable reference information can be provided for the research and development and safety of the battery;
in the actual production application field, the problems of battery gas production positioning analysis, component analysis and quality monitoring under the conditions of production links and working conditions are solved; the method provides favorable reference information for solving the problem of gas generation of the soft package battery, provides a scheme for pertinently improving and improving the battery performance, and has important guiding significance for modifying and improving the performance of the soft package battery material.
Drawings
In order that the manner in which the present invention is more fully understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, wherein:
FIG. 1 is a flow chart illustrating the steps of the method for detecting the gas production of the soft package battery in situ according to the invention;
fig. 2 is an ultrasonic imaging graph in the gas production process of the soft package battery of the invention;
fig. 3 is a graph of the detection result of differential electrochemical mass spectrometry in the gas production process of the soft package battery of the invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Example 1
Referring to fig. 1, the invention discloses a method for detecting gas generated by a soft package battery in situ, which comprises the following steps:
the method comprises the following steps of S1, sealing and placing the soft package battery in an in-situ mold, leading out a positive lug and a negative lug of the soft package battery from the in-situ mold, and connecting the positive lug and the negative lug of the soft package battery to a charge and discharge test system.
In this embodiment, on the one hand need realize the sealed to laminate polymer battery, on the other hand still need draw out positive negative pole ear, consequently, set up the normal position mould includes: bottom plate and shrouding be provided with the recess that is used for bearing laminate polymer battery in the bottom plate, will laminate polymer battery places the recess after, cover the shrouding on the bottom plate, will through the bolt the shrouding closure encapsulation is in on the bottom plate, the shrouding is sealed the recess, the shrouding with the bottom plate cooperation forms the seal chamber who is used for encapsulating laminate polymer battery, in order to draw out positive negative pole ear seted up utmost point ear through-hole on the shrouding, makes things convenient for laminate polymer battery's positive negative pole ear to follow draw out in the utmost point ear through-hole to be connected through wire and charge-discharge test system electricity.
Specifically, in this embodiment, the charge and discharge test adopts a LAND battery test system, and can autonomously edit a battery charge and discharge program including parameters such as charge and discharge amount, charge and discharge time, and charge and discharge rate, and can be adapted to different test requirements.
S2, placing the in-situ mold for packaging the soft package battery into ultrasonic imaging equipment, and starting a charge and discharge test system to control charge and discharge of the soft package battery.
With the rapid development of science and technology, ultrasonic waves are not only used for testing distance, but also can be applied to imaging in the medical field; ultrasonic imaging in the medical field is to scan a human body with ultrasonic beams, and to obtain an image of an internal organ by receiving and processing reflected signals; the ultrasonic imaging technology is applied to the industry at the present stage, and the ultrasonic imaging equipment can convert the sound heard by the ultrasonic imaging equipment into a visual image, so that the gas leakage or sound characteristic change condition can be quickly detected, positioned and checked, and the potential accident risk is avoided; the embodiment utilizes the principle of the ultrasonic imaging to realize visual observation of the gas production of the soft package battery.
And S3, leading out gas generated in the charge and discharge process of the soft package battery from the in-situ mold, and introducing the gas into a differential electrochemical mass spectrometry analyzer.
The differential electrochemical mass spectrometer is an analytical instrument used in the chemical field, can analyze in situ trace gases generated or consumed by a metal-air battery and the gases generated by the side reactions of energy storage devices such as a lithium ion battery, a lithium metal battery, a sodium ion battery and the like in the charging and discharging processes, and can analyze and detect the gas consumption or generation conditions in the battery operation stage in real time; in the embodiment, a differential electrochemical mass spectrometer is used for analyzing by extracting the generated gas in the battery, the trace gas generated by the battery is pumped into the analysis equipment through the carrier gas under the condition of mass spectrum negative pressure, and the mass spectrum equipment qualitatively and quantitatively analyzes the gas to obtain a relatively ideal detection signal, namely the generated or consumed gas component and content.
Specifically, in this embodiment, the pouch battery is hermetically placed in the in-situ mold, in order to lead the generated gas out of the in-situ mold, a gas-generating through hole is further formed in a sealing plate of the in-situ mold, and the gas generated during the charge and discharge processes of the pouch battery is led out of the gas-generating through hole and is transported to the differential electrochemical mass spectrometer through a conduit.
In the embodiment, in order to ensure the stability of gas generation and discharge and ensure that gas generated in the charging and discharging process can be delivered to a differential electrochemical mass spectrometer at the first time, the gas generation through hole is provided with an air inlet hole and an air outlet hole, the air inlet hole is communicated with a gas generation device, the air outlet hole is communicated with the differential electrochemical mass spectrometer, the gas generation device introduces carrier gas into an in-situ mold through the air inlet hole, and the gas generated in the charging and discharging process of the flexible package battery is discharged from the air outlet hole through the carrier gas and is brought into the differential electrochemical mass spectrometer; and arranging the gas generating device to introduce carrier gas into the in-situ mold at a constant gas flow rate through a flow controller.
In this embodiment, the seal plate of the in-situ mold is not only provided with the gas generation through hole, but also provided with the tab through hole, so as to prevent the gas generated in the charge and discharge process of the soft package battery from being discharged from the tab through hole, the positive and negative tabs are led out from the tab through hole, and then the tab through hole is sealed and packaged, so that the sealing performance of the in-situ mold is ensured, the in-situ mold has the unique gas flow direction, namely the gas enters from the gas inlet and is discharged from the gas outlet, and the gas generated in the charge and discharge process of the soft package battery can completely enter the differential electrochemical mass spectrometry analyzer.
In the embodiment, the ultrasonic imaging test technology can position the gas generated in the soft package battery and present the local generated amount, and has the advantages that the strength of a local reflected signal of the soft package battery along with circulation can be visually seen through a picture fed back by an ultrasonic imaging system, the gas generation position and the gas dispersion condition in the soft package battery can be visually and clearly seen, but the defects that the generated gas type and the content of each gas cannot be clearly determined are overcome, the gas generated in the soft package battery can be quantitatively analyzed by utilizing a differential electrochemical mass spectrometry test technology, the sizes and the relative concentration content percentages of each component of ion current in the generated gas can be accurately and qualitatively analyzed, the ultrasonic imaging test technology has the advantages that the generated gas type and the corresponding gas content percentages can be obtained through mass spectrometry curve analysis, but the defects that the specific site in the gas generation of the soft package battery is not clear enough and the gas generation condition in the battery cannot be fed back, the two test technologies are combined, the ultrasonic imaging test technology is used for visually representing the characteristics of the gas generated by the clearly clear position of the soft package battery, the visual effect and the gas generated by utilizing the differential electrochemical mass spectrometry qualitative analysis, and the visual observation of the image of the soft package battery; the differential electrochemical mass spectrometry technology is used as a back-end analysis test, and gas components and content are reacted through corresponding ion current values and relative concentration content percentages, so that gas production positioning, qualitative and quantitative in-situ real-time detection of the soft package battery is realized,
in addition, the method for carrying out in-situ detection on the gas generated by the soft package battery is adopted to package the soft package battery, so that the in-situ detection on the soft package battery is realized, the soft package battery is not influenced or interfered by environmental gas, the test result is accurate, the method can be quickly and conveniently implemented in a production workshop of a battery factory, and meanwhile, valuable reference information can be provided for research, development and safety of the battery.
Example 2
The invention also discloses a device for carrying out in-situ detection on the gas generated by the soft package battery, which is used for realizing the method of the embodiment 1 and comprises the following steps: the in-situ mold, the ultrasonic imaging equipment and the differential electrochemical mass spectrometry instrument adopt the device of the embodiment to realize the specific process of the embodiment 1 as follows:
the method comprises the steps of placing a punching hole of the soft package battery in an in-situ mold, leading out the positive electrode and the negative electrode of the soft package battery from tab through holes of a sealing plate, fastening a bottom plate and the sealing plate of the in-situ mold by screws, enabling the soft package battery to be in a sealed state, then placing the soft package battery into an ultrasonic imaging device, respectively communicating an air inlet hole and an air outlet hole in the sealing plate to a gas generation device and a differential electrochemical mass spectrometry analyzer, setting a corresponding charging and discharging program, simultaneously starting the ultrasonic device to perform ultrasonic treatment, observing the local gas generation condition in the soft package battery in real time through a computer imaging system, taking out the generated gas through a pipeline constant flow rate carrier gas, enabling the generated gas to enter the differential electrochemical mass spectrometry analyzer, and performing mass spectrometry.
Specifically, the charging and discharging process of the flexible package battery is set as a cycle period, as shown in fig. 2, a gas production distribution image in the charging and discharging period of the flexible package battery is monitored through an ultrasonic imaging device, as shown in fig. 3, a gas production flow and gas production components in the charging and discharging period of the flexible package battery are monitored through a differential electrochemical mass spectrometry instrument.
Specifically, the method for detecting gas generated by a soft package battery in situ further includes step S4, comparing the gas generation distribution image in the charge-discharge period of the soft package battery monitored by the ultrasonic imaging device in step S2 with the gas generation flow in the charge-discharge period of the soft package battery monitored by the differential electrochemical mass spectrometer in step S3 in time to obtain an accurate time point of gas generation in the charge-discharge period of the soft package battery, so that it can be seen that the battery has serious side reaction gas generation in the charge start and the whole discharge process, and CO2, H2 and CH4 generation can be monitored in situ, wherein the contents of Ar, N2 and O2 in comparison gas are almost unchanged.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The method for carrying out in-situ detection on the gas generated by the soft package battery is characterized by comprising the following steps of:
s1, sealing and placing a soft package battery in an in-situ mold, leading out positive and negative lugs of the soft package battery from the in-situ mold, and connecting the positive and negative lugs of the soft package battery to a charge and discharge test system;
s2, placing the in-situ mold for packaging the soft package battery in ultrasonic imaging equipment, and starting a charge-discharge test system to perform charge-discharge control on the soft package battery;
and S3, leading out gas generated in the charge and discharge process of the soft package battery from the in-situ mold, and introducing the gas into a differential electrochemical mass spectrometry analyzer.
2. The method for detecting the gas production of the soft package battery in situ according to claim 1 is characterized in that: in step S1, the in-situ mold includes:
the bottom plate is internally provided with a groove for bearing the soft package battery;
the sealing plate is matched with the bottom plate, locked and packaged on the bottom plate through bolts, and used for sealing the groove;
the sealing plate is provided with a tab through hole and a gas production through hole, the positive and negative tabs of the soft package battery are led out from the tab through hole, and gas produced in the charge and discharge process of the soft package battery is led out from the gas production through hole.
3. The method for detecting the gas production of the soft package battery in situ according to claim 2 is characterized in that: and after the positive and negative lugs are led out from the lug through holes, the lug through holes are sealed and packaged.
4. The method for detecting the gas production of the soft package battery in situ according to claim 2 is characterized in that: the gas generation through hole comprises a gas inlet hole and a gas outlet hole, the gas inlet hole is communicated with a gas generation device, the gas outlet hole is communicated with the differential electrochemical mass spectrometer, carrier gas is introduced into the in-situ mold through the gas inlet hole by the gas generation device, and gas generated in the charge and discharge process of the soft package battery is discharged from the gas outlet hole and brought into the differential electrochemical mass spectrometer through the carrier gas.
5. The method for in-situ detection of gas production of the soft-package battery according to claim 4, characterized in that: and the gas generating device is used for introducing carrier gas into the in-situ mold through a flow controller at a constant gas flow rate.
6. The method for detecting the gas production of the soft package battery in situ according to claim 1 is characterized in that: in step S1, the process of charging and discharging the pouch battery is set to one cycle period.
7. The method for in-situ detection of gas production of the soft-package battery according to claim 1, characterized in that: in the step S2, a gas production distribution image in the charge-discharge period of the soft package battery is monitored through an ultrasonic imaging device.
8. The method for detecting the gas production of the soft package battery in situ according to claim 1 is characterized in that: in step S3, the flow rate and the components of the generated gas in the charge-discharge period of the pouch battery are monitored by a differential electrochemical mass spectrometer.
9. The method for detecting the gas production of the soft package battery in situ according to claim 1 is characterized in that: and S4, comparing the gas production distribution image in the charge-discharge period of the soft package battery monitored by the ultrasonic imaging equipment in the step S2 with the gas production flow in the charge-discharge period of the soft package battery monitored by the differential electrochemical mass spectrometry instrument in the step S3 in time to obtain an accurate time point of gas production in the charge-discharge period of the soft package battery.
10. The utility model provides a device that carries out normal position detection to laminate polymer battery gas production which characterized in that: for carrying out the method of any one of the preceding claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116243180A (en) * | 2023-02-08 | 2023-06-09 | 苏州大学 | In-situ test method for charge-discharge gas production of soft-packaged battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116243180A (en) * | 2023-02-08 | 2023-06-09 | 苏州大学 | In-situ test method for charge-discharge gas production of soft-packaged battery |
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