CN114914566A - Lithium battery with flexible temperature monitoring sensor integrated inside battery core - Google Patents
Lithium battery with flexible temperature monitoring sensor integrated inside battery core Download PDFInfo
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- CN114914566A CN114914566A CN202210601887.4A CN202210601887A CN114914566A CN 114914566 A CN114914566 A CN 114914566A CN 202210601887 A CN202210601887 A CN 202210601887A CN 114914566 A CN114914566 A CN 114914566A
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
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- Secondary Cells (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention provides a lithium battery with a flexible temperature monitoring sensor integrated in a battery cell, which comprises: lithium cell body and flexible film temperature sensor, lithium cell body includes electric core and lithium cell housing, be connected with data connection line on the flexible film temperature sensor, flexible film temperature sensor is located inside the lithium cell body, data connection line extends to the lithium cell body outside. The lithium battery with the flexible temperature monitoring sensor integrated in the battery core provided by the invention overcomes the difficulty that the temperature of the battery core is difficult to monitor in situ in real time, and can monitor the temperature in the lithium battery in real time, so that a detector can control the temperature in the battery timely and accurately, and the use risk of the battery is reduced to the minimum.
Description
Technical Field
The invention relates to the field of battery detection, in particular to a lithium battery with a flexible temperature monitoring sensor integrated in a battery core.
Background
With the rapid development of society and science and technology, lithium batteries are becoming an indispensable energy source in human society. The lithium battery has the advantages of high energy density, long service life, light weight, environmental protection and the like. However, lithium batteries have potential safety hazards and risk of explosion. When a short circuit occurs outside the battery core, the electronic assembly cannot cut off a loop in time, so that the temperature inside the battery core rises, the electrolyte is gasified, the battery shell expands and is broken, and explosion occurs. In addition, the overcharge of the battery can cause needle-shaped lithium metal crystals to be formed everywhere on the pole piece, the temperature of the battery can be gradually increased, the electrolyte is gasified, and finally the shell is broken, so that air enters the battery core and is violently oxidized with the lithium metal, or the temperature is too high, so that the material is combusted to cause explosion. Therefore, monitoring of the internal conditions of lithium batteries is very necessary.
China patent publication No. CN 207559000U, granted publication date: 2018.06.29, discloses a lithium battery capable of detecting internal temperature and pressure, which comprises a battery core, a base, a cap and a cylindrical shell, wherein the base is fixedly arranged at the lower end of the shell, the cap is fixedly arranged at the upper end of the shell, and the battery core is inserted in the shell; the PCB is connected with a data transmission line, the base is provided with a through hole, and one end of the data transmission line penetrates through the through hole and extends out of the shell.
Foretell utility model patent can be to the monitoring of the temperature and the pressure of single lithium cell, with the sensor setting make its can be very convenient know the inside condition of lithium cell on the PCB board. However, the utility model has certain defects; firstly, the real internal condition of the lithium battery cannot be monitored by the utility model, the sensor is arranged on the PCB, and the conditions of the bottom temperature and the bottom pressure of the lithium battery are actually monitored; two, this utility model can not monitor at lithium cell during operation, and this lithium cell must be put into corresponding casing during the monitoring in the middle of, all sealed up completely from top to bottom, can't monitor the lithium cell work flow such as charge-discharge.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a lithium battery with a flexible temperature monitoring sensor integrated in a battery core.
According to the invention, the lithium battery with the flexible temperature monitoring sensor integrated in the battery core comprises: lithium cell body and flexible film temperature sensor, lithium cell body includes electric core and lithium cell housing, be connected with data connection line on the flexible film temperature sensor, flexible film temperature sensor is located inside the lithium cell body, data connection line extends to the lithium cell body outside.
Preferably, the flexible film temperature sensor is arranged on the inner wall of the lithium battery shell.
Preferably, the flexible film temperature sensor is arranged on the surface of the battery core.
Preferably, the flexible film temperature sensor is a resistive temperature film sensor.
Preferably, a platinum resistor is adopted in the resistance temperature thin film sensor.
Preferably, the flexible film temperature sensor is a flexible film thermocouple temperature sensor.
Preferably, the flexible film thermocouple temperature sensor adopts a K-type thermocouple, the positive electrode material of the K-type thermocouple is nickel chromium, and the negative electrode material of the K-type thermocouple is nickel silicon.
Preferably, the surface of the flexible film temperature sensor is coated with a rubber film.
Preferably, the number of the flexible thin film temperature sensors is one or more, and the flexible thin film temperature sensors are located inside the lithium battery body.
Preferably, the lithium battery body positive pole comprises a safety valve and an air vent on the positive pole cover, and the data connecting wire extends from the air vent to the outside of the lithium battery body through the surface of the battery cell and the edge of the safety valve.
Compared with the prior art, the invention has the following beneficial effects:
1. the lithium battery with the flexible temperature monitoring sensor integrated in the battery core provided by the invention overcomes the difficulty that the temperature of the battery core is difficult to monitor in situ in real time, and can detect the temperature in the lithium battery in real time, so that a detector can control the temperature in the battery timely and accurately, and the use risk of the battery is reduced to the minimum.
2. Compared with the existing scheme for measuring the temperature of the outer surface of the battery, the method for measuring the internal temperature of the battery can feed back the internal temperature of the battery at the initial stage of the battery failure, and reduce the explosion probability of the battery.
3. The invention can directly measure the surface temperature change of the battery core and feed back the battery abnormity when the battery outer surface is not abnormal at the initial stage of the fault.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of an embodiment 1 in which a flexible thin film temperature sensor is embedded in the inner wall of a case of a lithium battery;
FIG. 2 is a schematic structural view of a flexible platinum thin film temperature sensor according to example 1;
fig. 3 is a schematic diagram of the surface of a wound cell in which a flexible thin film temperature sensor is arranged inside a lithium battery in embodiment 2;
FIG. 4 is a schematic view showing the structure of a flexible thin film thermocouple temperature sensor according to example 2;
FIG. 5 is a schematic view of a two-layer PET corrosion resistant package of example 3;
FIG. 6 is a schematic diagram showing the path of the data connection line extending from the flexible film temperature sensor to the outside of the lithium battery in example 4;
FIG. 7 is a three-dimensional view of the lithium battery according to the fourth embodiment, wherein the data connection line is led out of the vent hole.
Description of reference numerals:
free end 8 of flexible thin film thermocouple of lithium battery shell 1
Flexible film temperature sensor 2 PET upper film 9
Flexible film thermocouple working end 7 safety valve 14
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
The invention discloses a lithium battery with a flexible temperature monitoring sensor integrated in a battery cell, which comprises: lithium cell body 3 and flexible film temperature sensor 2, lithium cell body 3 includes electric core 4 and lithium cell housing 1, be connected with data connection line 11 on the flexible film temperature sensor 2, flexible film temperature sensor 2 is located inside lithium cell body 3, data connection line 11 extends to 3 outsides of lithium cell body.
As shown in fig. 1, in some specific embodiments, the flexible thin film temperature sensor 2 is disposed on the inner wall of the lithium battery case 1.
As shown in fig. 2, in some embodiments, the flexible thin film temperature sensor 2 is a resistance temperature thin film sensor 6, and the resistance temperature thin film sensor 6 can change a resistance value with a temperature change of a metal used, and has high accuracy, repeatability and stability.
The resistance temperature film sensor 6 is most commonly made of platinum, and has the advantages of higher resistance temperature coefficient, wide measurement range and the like compared with other alloys. The resistive temperature film sensor 6 has higher accuracy and a more linear response than the thermocouple sensor. They are more stable in measurement and have a wide temperature range. However, they have longer response times and lower sensitivity.
Example 2
This embodiment is different from embodiment 1 in that: as shown in fig. 3, the flexible film temperature sensor 2 is wound on the surface of the battery cell 4 through the plastic film 5, and the flexible film temperature sensor 2 transmits temperature parameters to a detection device outside the lithium battery through the wound battery cell 4 surface inside the lithium battery through a data connection line 11.
As shown in fig. 4, in some embodiments, the flexible thin film temperature sensor 2 is a flexible thin film thermocouple temperature sensor, which is a closed loop composed of at least two different metals. When a temperature difference exists between the two ends of the flexible thin film thermocouple temperature sensor, current passes through the loop, and an electric potential appears between the two ends of the flexible thin film thermocouple, which is also called a seebeck effect and is also called a thermoelectric effect. The flexible film thermocouple temperature sensor comprises a flexible film thermocouple working end 7 and a flexible film thermocouple free end 8, when the temperature difference between the two ends of the thermocouple temperature sensor is large, large current can be generated in a loop, and thermoelectromotive force is obtained through measurement, so that the related temperature is deduced. In most cases, the thermoelectric voltage is a linear or near linear single-valued function of temperature. The flexible film thermocouple temperature sensor does not need an external power supply during measurement, and is very convenient to use.
Example 3
The present embodiment is different from the above embodiments in that: when the lithium battery is manufactured, after the winding process of the battery cell 4 is completed (namely, the positive pole piece, the isolating membrane and the negative pole piece are sequentially discharged, the positive pole piece, the isolating membrane and the negative pole piece are wound by a machine to form the bare cell 4), and before the bare cell 4 is placed into a shell, the flexible film temperature sensor 2 is wound and fixed on the curved surface of the battery cell 4, as shown in fig. 1. Or, before the bare cell 4 is placed into the shell, the flexible film temperature sensor 2 is pasted on the inner wall of the lithium battery shell 1 in advance. Electrolyte is then added to the cell 4, and the cell 4 is completely sealed and used for testing. Because electrolyte has certain corrosivity, the corrosivity of electrolyte is resisted to the inside rubber goods film that often adopts of electricity core 4, and flexible sensor also adopts films such as PET mostly, and the very suitable electrolyte environment utilizes the sensor of upper and lower double-deck PET plastic envelope can be better the corrosivity difficult problem of solution electrolyte.
As shown in fig. 5, in order to avoid the corrosion of the sensor by the electrolyte and the interference of signals, the flexible thin film temperature sensor 2 plastically packaged by the PET upper thin film 9 and the PET lower thin film 10 is adopted, so that the difficult problem of the corrosivity of the electrolyte can be solved well. Meanwhile, the thickness of the flexible printing sensor is only in the micron size, and the flexible printing sensor is suitable for being integrated into the battery core 4. The number of the flexible film temperature sensors 2 may be one or more.
Example 4
As shown in fig. 6 and 7, in some specific embodiments, the lithium battery body 3 includes a safety valve 14 at the positive electrode and an air vent 12 on the positive electrode cover 13, and the data connection line 11 extends from the air vent 12 to the outside of the lithium battery body 3 through the surface of the battery cell 4, through the edge of the safety valve 14. The data connection line 11 needs to be pulled out of the lithium battery positive cover 13 during operation, and can be hidden in the positive cover 13 during non-operation.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. The utility model provides a lithium cell of flexible temperature monitoring sensor of electricity core internal integration which characterized in that includes: lithium cell body (3) and flexible film temperature sensor (2), lithium cell body (3) are including electric core (4) and lithium cell casing (1), be connected with data connecting wire (11) on flexible film temperature sensor (2), flexible film temperature sensor (2) are located inside lithium cell body (3), data connecting wire (11) extend to lithium cell body (3) outside.
2. The lithium battery of claim 1, wherein the lithium battery comprises a battery core and a flexible temperature monitoring sensor integrated inside the battery core, and the flexible temperature monitoring sensor comprises: the flexible film temperature sensor (2) is arranged on the inner wall of the lithium battery shell (1).
3. The lithium battery of claim 1, wherein the lithium battery comprises a battery core and a flexible temperature monitoring sensor integrated inside the battery core, and the flexible temperature monitoring sensor comprises: the flexible film temperature sensor (2) is arranged on the surface of the battery core (4).
4. The lithium battery of claim 1, wherein the lithium battery comprises a battery core and a flexible temperature monitoring sensor integrated inside the battery core, and the flexible temperature monitoring sensor comprises: the flexible film temperature sensor (2) is a resistance type temperature film sensor (6).
5. The lithium battery of claim 4, wherein the lithium battery comprises a battery core and a flexible temperature monitoring sensor integrated inside the battery core, and the flexible temperature monitoring sensor comprises: the resistance type temperature film sensor (6) adopts a platinum resistor.
6. The lithium battery with the flexible temperature monitoring sensor integrated in the battery core according to claim 1, wherein: the flexible film temperature sensor (2) is a flexible film thermocouple temperature sensor.
7. The lithium battery of claim 6, wherein the lithium battery comprises a battery core and a flexible temperature monitoring sensor integrated inside the battery core, and the flexible temperature monitoring sensor comprises: the flexible film thermocouple temperature sensor adopts a K-type thermocouple, the positive electrode material of the K-type thermocouple is nickel chromium, and the negative electrode material of the K-type thermocouple is nickel silicon.
8. The lithium battery of claim 1, wherein the lithium battery comprises a battery core and a flexible temperature monitoring sensor integrated inside the battery core, and the flexible temperature monitoring sensor comprises: the surface of the flexible film temperature sensor (2) is coated with a rubber film.
9. The lithium battery with the flexible temperature monitoring sensor integrated in the battery core according to claim 1, wherein: the number of the flexible thin film temperature sensors (2) is set to be one or more, and the flexible thin film temperature sensors are all located inside the lithium battery body (3).
10. The lithium battery of claim 1, wherein the lithium battery comprises a battery core and a flexible temperature monitoring sensor integrated inside the battery core, and the flexible temperature monitoring sensor comprises: the lithium battery body (3) comprises a safety valve (14) and an exhaust hole (12) on a positive electrode cover (13) at the positive electrode, and the data connection line (11) extends from the exhaust hole (12) to the outside of the lithium battery body (3) through the surface of the battery core (4) and the edge of the safety valve (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210601887.4A CN114914566A (en) | 2022-05-30 | 2022-05-30 | Lithium battery with flexible temperature monitoring sensor integrated inside battery core |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210601887.4A CN114914566A (en) | 2022-05-30 | 2022-05-30 | Lithium battery with flexible temperature monitoring sensor integrated inside battery core |
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| CN114914566A true CN114914566A (en) | 2022-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210601887.4A Pending CN114914566A (en) | 2022-05-30 | 2022-05-30 | Lithium battery with flexible temperature monitoring sensor integrated inside battery core |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116111222A (en) * | 2023-04-13 | 2023-05-12 | 深圳市迈姆斯科技有限公司 | Battery cell provided with sensor and lithium battery |
| CN117053937A (en) * | 2023-10-12 | 2023-11-14 | 柔微智能科技(苏州)有限公司 | Temperature sensor, preparation method thereof and battery integrated with temperature sensor |
-
2022
- 2022-05-30 CN CN202210601887.4A patent/CN114914566A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116111222A (en) * | 2023-04-13 | 2023-05-12 | 深圳市迈姆斯科技有限公司 | Battery cell provided with sensor and lithium battery |
| CN117053937A (en) * | 2023-10-12 | 2023-11-14 | 柔微智能科技(苏州)有限公司 | Temperature sensor, preparation method thereof and battery integrated with temperature sensor |
| CN117053937B (en) * | 2023-10-12 | 2023-12-26 | 柔微智能科技(苏州)有限公司 | Temperature sensor, preparation method thereof and battery integrated with temperature sensor |
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