CN115790488A - Real-time monitoring method and device for thickness change of battery and electrode - Google Patents
Real-time monitoring method and device for thickness change of battery and electrode Download PDFInfo
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- CN115790488A CN115790488A CN202211460911.3A CN202211460911A CN115790488A CN 115790488 A CN115790488 A CN 115790488A CN 202211460911 A CN202211460911 A CN 202211460911A CN 115790488 A CN115790488 A CN 115790488A
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- 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 discloses a method and a device for monitoring thickness change of a battery and an electrode in real time, wherein S1, a pressure sensor is provided to establish a thickness change conversion recording module; s2, providing a real-time monitoring device for the thickness change of the battery; s3, placing the pressure sensor between the battery outer package and the anode or the cathode of the battery, or between the anode and the cathode of the battery, and preparing the battery with the built-in pressure sensor; s4, providing a battery rigid container, and placing the built-in pressure sensor battery in the battery rigid container to enable the battery rigid container to be tightly attached to the outer surface of the built-in pressure sensor battery along the direction of a battery reaction surface; and S5, connecting the data acquisition line with a data recording system, testing the electrical property of the battery with the built-in pressure sensor, and recording the pressure and thickness change value in the battery testing process in real time by the data recording system. The thickness change values of the battery and the electrode in the whole process are obtained by utilizing the monitoring method and the monitoring device, and then the reaction conditions of the battery and the electrode are analyzed.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method and a device for monitoring thickness changes of a battery and an electrode in real time.
Background
In the process of charging and discharging of the battery, the positive and negative active materials react, and the thicknesses of the positive and negative pole pieces change along with the reaction. Under the condition that the volume of the battery is fixed, the thickness change of the pole pieces can cause the change of the interface of the positive pole piece and the negative pole piece participating in the reaction and the pressure borne by the surface of the diaphragm, thereby influencing the electrode reaction and the stability of the diaphragm. The method for testing the longitudinal pressure born by the surfaces of the electrode and the diaphragm in the charging and discharging process of the battery is of great significance for researching the influence factors of the electrical performance of the battery, however, no relevant testing device or testing method exists at present.
Different electrodes can change in thickness under different charging and discharging states or different cycle times, the change of the electrode thickness can reflect the condition of electrode reaction, and the performance change of the battery in working can also be researched, so that the real-time monitoring of the electrode thickness is of great significance for analyzing the electrode and the battery, however, the real-time testing of the electrode thickness change is difficult in the actual testing process. It is therefore desirable to provide a method and apparatus for real-time monitoring of battery and electrode thickness variations.
Disclosure of Invention
The invention aims to solve the problem that the thickness change of an electrode is difficult to monitor in real time in the charging and discharging processes of a battery.
In order to achieve the above object, the present invention provides a method for monitoring the thickness variation of a battery in real time, comprising the following steps: the method comprises the following steps that S1, a pressure sensor is provided, pressure is applied to the pressure sensor in the full-range of the pressure sensor, the pressure value is recorded in real time, a thickness measuring device is used for testing the thickness value of the pressure sensor in real time to obtain a real-time thickness value, the initial thickness value is subtracted from the real-time thickness value to obtain a thickness change value, a pressure-thickness change curve of the pressure sensor is established according to the data, and a thickness change conversion recording module is established according to the pressure-thickness change curve;
s2, providing a real-time monitoring device for battery thickness change, wherein the real-time monitoring device comprises a pressure sensor and a data recording system, the data recording system comprises a pressure recording module and a thickness change conversion recording module, the pressure sensor is connected with the data recording system through a data acquisition line, the pressure sensor is used for testing pressure, the pressure recording module is used for recording a tested pressure value, and the thickness change conversion recording module is used for converting the pressure value into a thickness change value and recording the thickness change value;
s3, placing the pressure sensor between the battery outer package and the anode or the cathode of the battery, or between the anode and the cathode of the battery, integrally packaging the pressure sensor in the battery outer package, and filling electrolyte in the outer package to obtain the battery with the built-in pressure sensor;
s4, providing a battery rigid container, and placing the battery with the built-in pressure sensor in the battery rigid container to enable the battery rigid container to be tightly attached to the outer surface of the battery with the built-in pressure sensor along the direction of a battery reaction surface;
and S5, connecting the data acquisition line with a data recording system, testing the electrical property of the battery with the built-in pressure sensor, and recording the pressure and thickness change value in the battery testing process in real time by the data recording system.
Preferably, the pressure sensor is any one of piezoresistive type, parallel plate capacitive type, piezoelectric type, triboelectric type and ion-electron type or a combination of any two or more of them.
Preferably, the pressure sensors are distributed in any one of an integrated form and a distributed form.
The invention also provides a real-time monitoring device for electrode thickness change, comprising: a built-in pressure sensor battery and a data recording system; the built-in pressure sensor battery comprises an electrode to be measured, a diaphragm, a counter electrode, a pressure sensor and a battery outer package; the data recording system comprises a pressure recording module and a thickness change conversion recording module, and is connected with the pressure sensor through a data acquisition line; and the counter electrode and the diaphragm have unchanged thickness in the test process, and the battery outer package is also filled with electrolyte.
Preferably, the electrode to be measured is any one of a metal lithium electrode, a carbon fluoride electrode and a silicon electrode.
Preferably, the diaphragm is made of any one or a combination of any two or more of polyethylene, polypropylene and polyimide.
Preferably, the counter electrode is any one of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium nickel cobalt manganate and lithium nickel cobalt aluminate.
Preferably, the device for monitoring the thickness variation of the electrode in real time further comprises a rigid container of the battery.
Preferably, the built-in pressure sensor battery is any one of a cylindrical battery, a prismatic battery, and a pouch battery.
Preferably, the battery outer package is made of any one of a rigid material and a flexible package material.
The invention has the beneficial effects that:
(1) The thickness change condition of the battery can be monitored in real time in the battery testing process, and the environmental working condition of the battery during use is further designed;
(2) The thickness change conditions of different parts of the battery reaction surface can be analyzed, and the reaction conditions of all parts of the battery in the charging and discharging process can be researched;
(3) The electrode thickness is monitored in real time in the battery test process, and the electrode thickness monitoring method can be used for analyzing the electrode reaction condition.
Drawings
Fig. 1 is a schematic cross-sectional view of a battery with a built-in pressure sensor in an embodiment.
Fig. 2 is a top view of the flexible film sensor of the built-in pressure sensor battery in the embodiment.
FIG. 3 is a top view of the negative electrode plate of the battery with a built-in pressure sensor in the embodiment.
Fig. 4 is a top view of the positive electrode plate of the battery with the built-in pressure sensor in the embodiment.
Fig. 5 is a top view of an embodiment of a battery with a built-in pressure sensor.
Fig. 6 is a schematic cross-sectional view of a second internal pressure sensor cell.
Fig. 7 is a top view of a second battery flexible film sensor.
Fig. 8 is a top view of a second internal pressure sensor cell.
Fig. 9 is a pressure-thickness variation curve.
Fig. 10 is a graph of pressure versus time and voltage versus time during charging and discharging of a battery.
Fig. 11 is a graph of thickness change versus time and voltage versus time during charging and discharging of a battery.
In the figure, 1-diaphragm, 2-film type flexible pressure sensor, 3-negative pole piece, 4-positive pole piece, 5-tab glue, 6-negative pole tab, 7-positive pole tab, 8-data acquisition line, and 9-battery external package.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
The invention provides a real-time monitoring device for electrode thickness change, which comprises a battery rigid container, a built-in pressure sensor battery and a data recording system. The built-in pressure sensor battery comprises a data acquisition line extending to the outside of the battery, and the data recording system comprises a pressure recording module and a thickness change conversion recording module; the data recording system is electrically connected with the pressure sensor through the data acquisition line; the rigid container of the battery limits the whole thickness of the battery, and under the condition that the whole thickness of the battery is limited, the thickness of the electrode which expands (contracts) is equal to the thickness of the pressure sensor which contracts (expands).
As shown in fig. 1, 2, 3, 4, and 5, the battery with a built-in pressure sensor of the present invention includes a battery, a battery outer package, a plurality of pressure sensors disposed in the battery outer package, and a diaphragm disposed between a positive electrode or a negative electrode of the battery and the pressure sensors, wherein the battery outer package is further filled with an electrolyte, and the pressure sensors are disposed between the battery outer package and the positive electrode or the negative electrode of the battery, or between the positive electrode and the negative electrode of the battery, as shown in fig. 6, 7, and 8. In this embodiment, 2 both sides parcel diaphragms 1 of film type flexible pressure sensor are located between the negative pole piece 3 and the battery extranal packing 9 of battery, and data acquisition line 8 links to each other with film type flexible pressure sensor 2 and extends to the battery outside, data acquisition line 8 is sealed with battery extranal packing 9 through utmost point ear gum 5, and anodal utmost point ear 7, negative pole utmost point ear 6 are sealed with battery extranal packing 9 through utmost point ear gum 5. The invention also provides another battery with a built-in pressure sensor, as shown in fig. 6, 7 and 8, the battery is a battery with a built-in pressure sensor, in which the thin film type flexible pressure sensor 2 is positioned between the positive pole piece 4 and the negative pole piece 3 of the battery, and the rest is the same as the battery with a built-in pressure sensor in the embodiment.
The invention provides a real-time monitoring method for battery thickness change, which comprises the following steps:
s1, selecting a piezoresistive flexible film pressure sensor, placing the piezoresistive flexible film pressure sensor between two stainless steel clamping plates, and mounting screws and nuts at four corners of each stainless steel clamping plate to enable the initial distance between the stainless steel clamping plates to be equal to the initial thickness of the piezoresistive flexible film pressure sensor; then gradually fastening the screw and the nut, applying pressure to the piezoresistive flexible film pressure sensor, and recording the pressure value in real time; in the whole pressurizing process, the thickness between the upper surface and the lower surface of the stainless steel clamping plate is measured by a laser thickness gauge, the thickness of the two stainless steel clamping plates is subtracted to obtain the thickness of the piezoresistive flexible thin film pressure sensor, a pressure recording module records the pressure value tested by the piezoresistive flexible thin film pressure sensor, and a thickness conversion recording module records the thickness change value of the battery of the piezoresistive flexible thin film pressure sensor; and establishing a pressure-thickness change curve according to the pressure value and the thickness change value, and establishing a thickness change conversion recording module according to the pressure-thickness change curve as shown in fig. 9.
S2, providing a real-time monitoring device for battery thickness change, wherein the real-time monitoring device comprises a pressure sensor and a data recording system, the data recording system comprises a pressure recording module and a thickness change conversion recording module, the pressure sensor is connected with the data recording system through a data acquisition line, the pressure sensor is used for testing pressure, the pressure recording module is used for recording a tested pressure value, and the thickness change conversion recording module is used for converting the pressure value into a thickness change value and recording the thickness change value;
s3, placing the pressure sensor between the battery outer package and the anode or the cathode of the battery, or between the anode and the cathode of the battery, integrally packaging the pressure sensor in the battery outer package, and filling electrolyte in the outer package to obtain the battery with the built-in pressure sensor;
s4, providing a battery rigid container, and placing the built-in pressure sensor battery in the battery rigid container to enable the battery rigid container to be tightly attached to the outer surface of the built-in pressure sensor battery along the direction of a battery reaction surface;
and S5, connecting the data acquisition line with a data recording system, testing the electrical property of the battery with the built-in pressure sensor, and recording the pressure and thickness change value in the battery testing process in real time by the data recording system. Tests were carried out according to the above method to obtain the pressure-time and voltage-time curves during charging and discharging of the battery, and the thickness change-time and voltage-time curves during charging and discharging of the battery as shown in fig. 9, 10 and 11. According to the curve, the thickness change of the battery and the electrode in the battery testing process can be monitored in real time.
In summary, according to the method and the device for monitoring thickness changes of the battery and the electrode in real time provided by the invention, the piezoresistive flexible thin film pressure sensors are arranged between the positive electrode and the negative electrode of the battery or between the negative electrode of the battery and the outer package, and after the piezoresistive flexible thin film pressure sensors monitor the pressure values of each reaction surface of the battery in real time, the thickness changes of the battery and the electrode in the battery testing process can be monitored in real time, so that the method and the device have important significance for analyzing the reaction conditions of the battery and the electrode.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A real-time monitoring method for battery thickness variation is characterized by comprising the following steps:
the method comprises the following steps that S1, a pressure sensor is provided, pressure is applied to the pressure sensor in the full-range of the pressure sensor, the pressure value is recorded in real time, a thickness measuring device is used for testing the thickness value of the pressure sensor in real time to obtain a real-time thickness value, the initial thickness value is subtracted from the real-time thickness value to obtain a thickness change value, a pressure-thickness change curve of the pressure sensor is established according to the data, and a thickness change conversion recording module is established according to the pressure-thickness change curve;
s2, providing a real-time monitoring device for battery thickness change, wherein the real-time monitoring device comprises a pressure sensor and a data recording system, the data recording system comprises a pressure recording module and a thickness change conversion recording module, the pressure sensor is connected with the data recording system through a data acquisition line, the pressure sensor is used for testing pressure, the pressure recording module is used for recording a tested pressure value, and the thickness change conversion recording module is used for converting the pressure value into a thickness change value and recording the thickness change value;
s3, placing the pressure sensor between the battery outer package and the anode or the cathode of the battery, or between the anode and the cathode of the battery, integrally packaging the pressure sensor in the battery outer package, and filling electrolyte in the outer package to obtain the battery with the built-in pressure sensor;
s4, providing a battery rigid container, and placing the built-in pressure sensor battery in the battery rigid container to enable the battery rigid container to be tightly attached to the outer surface of the built-in pressure sensor battery along the direction of a battery reaction surface;
and S5, connecting the data acquisition line with a data recording system, testing the electrical property of the battery with the built-in pressure sensor, and recording the pressure and thickness change value in the battery testing process in real time by the data recording system.
2. The method according to claim 1, wherein the pressure sensor is any one of piezoresistive, parallel plate capacitive, piezoelectric, triboelectric, and ion-electron or a combination of any two or more of them.
3. The method for real-time monitoring of battery thickness variation according to claim 1, wherein the distribution of the pressure sensors is any one of integrated type and distributed type.
4. A device for real-time monitoring of electrode thickness variation, comprising:
a built-in pressure sensor battery and a data recording system;
the built-in pressure sensor battery comprises an electrode to be measured, a diaphragm, a counter electrode, a pressure sensor and a battery outer package;
the data recording system comprises a pressure recording module and a thickness change conversion recording module, and is connected with the pressure sensor through a data acquisition line;
and the counter electrode and the diaphragm have unchanged thickness in the test process, and the battery outer package is also filled with electrolyte.
5. The device for real-time monitoring of electrode thickness variation according to claim 4, wherein the electrode to be measured is any one of a metal lithium electrode, a carbon fluoride electrode, and a silicon electrode.
6. The device for real-time monitoring of electrode thickness variation according to claim 4, wherein the diaphragm is made of any one or a combination of any two or more of polyethylene, polypropylene and polyimide.
7. The device for real-time monitoring of electrode thickness variation according to claim 4, wherein the counter electrode is any one of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium nickel cobalt manganate, lithium nickel cobalt aluminate.
8. The device for real-time monitoring of electrode thickness variation as defined in claim 4, wherein the device for real-time monitoring of electrode thickness variation further comprises a rigid container for the battery.
9. The device for real-time monitoring of electrode thickness variation according to claim 4, wherein the built-in pressure sensor battery is any one of a cylindrical battery, a prismatic battery, and a pouch battery.
10. The device for real-time monitoring of electrode thickness variation according to claim 4, wherein the outer package of the battery is made of any one of rigid material and flexible package material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211460911.3A CN115790488A (en) | 2022-11-17 | 2022-11-17 | Real-time monitoring method and device for thickness change of battery and electrode |
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| CN202211460911.3A CN115790488A (en) | 2022-11-17 | 2022-11-17 | Real-time monitoring method and device for thickness change of battery and electrode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116295172A (en) * | 2023-05-15 | 2023-06-23 | 湖南隆深氢能科技有限公司 | Method, system, terminal equipment and storage medium for detecting membrane electrode production line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116295172A (en) * | 2023-05-15 | 2023-06-23 | 湖南隆深氢能科技有限公司 | Method, system, terminal equipment and storage medium for detecting membrane electrode production line |
| CN116295172B (en) * | 2023-05-15 | 2023-08-15 | 湖南隆深氢能科技有限公司 | Method, system, terminal equipment and storage medium for detecting membrane electrode production line |
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