CN113839112A - Method for wirelessly measuring internal temperature of battery in situ - Google Patents
Method for wirelessly measuring internal temperature of battery in situ Download PDFInfo
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- CN113839112A CN113839112A CN202110934904.1A CN202110934904A CN113839112A CN 113839112 A CN113839112 A CN 113839112A CN 202110934904 A CN202110934904 A CN 202110934904A CN 113839112 A CN113839112 A CN 113839112A
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- data acquisition
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 18
- 238000012625 in-situ measurement Methods 0.000 claims abstract 7
- 239000010410 layer Substances 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 7
- 239000002356 single layer Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 239000011889 copper foil Substances 0.000 claims description 4
- 239000011267 electrode slurry Substances 0.000 claims description 4
- 239000005030 aluminium foil Substances 0.000 claims description 2
- 238000004880 explosion Methods 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000013543 active substance Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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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
-
- 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)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
Abstract
The invention discloses a method for wirelessly measuring the internal temperature of a battery in situ, which belongs to the field of battery safety. The signal of the ultra-miniature wireless data acquisition module can be measured externally through equipment such as an external wireless data acquisition instrument, and the function of in-situ measurement of the temperature inside the battery pole piece is realized under the condition that the traditional battery assembly process is not influenced. In order to reduce the influence of the pre-embedded data acquisition module on the performance of the battery pole piece, the recommended size of the ultra-micro wireless data acquisition module is smaller than 100 micrometers.
Description
Technical Field
The invention relates to a method for wirelessly measuring the internal temperature of a battery in situ, belonging to the field of battery safety.
Background
In recent years, with the gradual deterioration of global environment, environmental protection and energy safety issues are receiving wide attention, and new energy automobiles are the main development direction and industry in all countries of the world. The development of electric vehicles can reduce oil consumption, reduce carbon dioxide emissions, and promote energy conversion and the upgrading of the automotive industry. Lithium ion batteries are currently widely used in consumer electronics and electric vehicles due to their advantages of high rated voltage, high specific energy, long cycle life, and low environmental pollution.
The temperature of the battery can obviously affect each performance index of the battery system, and the electrochemical process carried out inside can obviously affect the change of the system temperature in the working process, thereby having important influence on the indexes such as the output power, the efficiency, the service life and the like of the battery and the safety performance. Meanwhile, under the external conditions of high temperature or strong mechanical collision, the battery can cause severe reaction and temperature rise inside the battery, and finally the serious consequences of thermal runaway are caused, so that a plurality of fire and explosion accidents caused by the thermal runaway are brought. This has caused comparatively serious influence to the development of electric automobile trade, has reduced consumer's trust to electric automobile. Statistically, more than 60% of safety accidents of electric vehicles are related to power batteries, including overcharge, external short circuit, internal short circuit, electrolyte leakage, collision, metal foreign object puncture, and the like.
Thermal runaway safety accidents of lithium ion batteries are mainly classified into two forms, namely, ignition and explosion. The battery is a relatively gentle thermal runaway safety accident, the temperature of the battery is continuously increased, the capacity of the battery is reduced, a series of heat release side reactions occur inside the battery under certain inducement, so that the temperature rise rate is rapidly increased, the heat production rate is far higher than the heat dissipation rate, and finally the battery material and the internal electrolyte are combusted, so that the battery is ignited. Explosion is another more severe thermal runaway safety accident, because the inside of the battery belongs to a closed system, the temperature is continuously increased while the exothermic reaction is also continuously intensified, the gas generated by the exothermic decomposition of the internal active substance is continuously increased to cause the internal pressure to be continuously increased, and when the gas exceeds a certain limit value, the battery can explode, thereby bringing about a serious safety problem. Therefore, how to accurately monitor the temperature inside the battery and the temperature change rate is a problem that needs to be solved urgently in terms of the safety of the current battery, and this is one of bottlenecks that restrict further large-scale application of the lithium ion battery to the market.
Most of the current battery systems adopt a mode of attaching a thermocouple on the surface of a battery shell, and some manufacturers try to put the thermocouple inside the battery for detection and monitoring. Although the former temperature measurement method is convenient and low in cost, the externally measured temperature cannot completely reflect the transient temperature field inside the battery, and inherent temperature measurement errors exist, which directly affect the judgment of a user on the safety state of the battery and may cause serious consequences such as explosion due to thermal runaway of the battery. Although the latter can monitor the internal temperature of the battery in real time, the physical characteristics of the thermocouple itself necessitate the existence of a current path, so that a connecting wire of the thermocouple needs to be led out from the inside of the battery, and the internal environment of the battery is inevitably polluted due to the tiny gap, thereby affecting the performance of the battery.
Therefore, there is a need in the industry for a method for measuring the internal temperature of a battery in situ with both rapidity and accuracy without affecting the internal environment of the battery as much as possible.
Disclosure of Invention
The invention aims to provide a method for wirelessly measuring the internal temperature of a battery in situ, which is used for monitoring the safety state of the internal part of the battery in real time and optimizing the working strategy of a battery thermal management system according to acquired temperature information.
The technical scheme of the invention is as follows:
a method for wirelessly measuring the internal temperature of a battery in situ comprises an ultra-micro wireless data acquisition module, wherein the ultra-micro wireless data acquisition module is embedded in a pole piece or is arranged between the two pole pieces, temperature signals acquired by the ultra-micro wireless data acquisition module are transmitted to an external wireless receiving end through wireless data, and are transmitted to a battery management system and a battery thermal management system after data processing, so that the wireless in situ monitoring of the internal temperature of the battery is realized.
Furthermore, before the battery pole piece is dried and formed, the ultra-miniature wireless temperature acquisition module is embedded into the wet electrode slurry in advance, and then the ultra-miniature wireless temperature acquisition module is dried and formed together with the whole pole piece.
Furthermore, the size of the ultra-micro wireless temperature acquisition module is smaller than the thickness of the pre-buried pole piece, wherein the size of the ultra-micro wireless temperature acquisition module is smaller than 100 microns, and the thickness of the pole piece is larger than 100 microns.
Furthermore, the arrangement position of the ultra-micro wireless temperature acquisition module is the geometric center point of the pole piece.
Furthermore, when the dimension of the ultra-micro wireless data acquisition module is larger than the thickness of the pole pieces, a layer of diaphragm is additionally arranged on the other surface of the diaphragm between the ultra-micro wireless data acquisition module and the two pole pieces, and then the ultra-micro wireless data acquisition module is arranged between the two pole pieces and is positioned in the two layers of diaphragms.
Furthermore, the pole piece comprises a positive pole piece and a negative pole piece, and the ultra-miniature wireless data acquisition module is arranged in the positive pole piece or the negative pole piece.
The utility model provides a wireless normal position measures individual layer laminate polymer battery of inside temperature, includes mass flow body, positive plate, diaphragm, negative pole piece, the mass flow body be aluminium foil and copper foil, set up respectively in the positive plate and the negative pole piece outside, still including setting up the wireless data acquisition module of super miniature in the battery, this super miniature wireless data acquisition module is used for gathering the temperature signal in the battery.
Furthermore, the ultra-micro wireless data acquisition module is embedded in the pole pieces or placed between the two pole pieces.
Furthermore, the size of the ultra-micro wireless data acquisition module embedded in the pole piece is smaller than the thickness of the embedded pole piece, and the arrangement position of the ultra-micro wireless data acquisition module is the geometric central point of the pole piece.
Furthermore, a layer of diaphragm is arranged on the other surface of the diaphragm between the ultra-micro wireless data acquisition module and the two pole pieces, and the ultra-micro wireless data acquisition module is arranged in the two layers of diaphragms.
The invention has the advantages that based on the ultra-micro wireless data acquisition module embedded in the battery pole piece, the temperature signal can be directly acquired through an external wireless data acquisition instrument, and then the temperature and the change rate of the temperature in the battery can be accurately and quickly acquired under the conditions of not influencing the internal environment of the battery and not increasing the complexity of a battery wire harness, so that the safety state in the battery can be monitored, and serious consequences such as thermal runaway explosion of the battery can be avoided.
Drawings
FIG. 1 is a schematic diagram of the position arrangement of an ultra-micro wireless data acquisition module according to the present invention;
FIG. 2 is a schematic diagram of an embedded pole piece of the ultra-micro wireless data acquisition module;
FIG. 3 is a schematic view of an ultra-micro wireless data acquisition module placed between two pole pieces;
fig. 4 is a schematic diagram of an external signal receiving module and a corresponding system.
In the figure: 1. a battery pole piece; 2. an ultra-micro wireless data acquisition module; 3. aluminum foil; 4. a positive plate; 5. a diaphragm; 6. a negative plate; 7. copper foil.
Detailed Description
The method for wirelessly measuring the internal temperature of the battery in situ mainly comprises the steps of embedding an ultra-miniature wireless data acquisition module (or called a sensor) into wet electrode slurry in advance before drying and forming battery pole pieces, or adding a layer of diaphragm on the other surface of the diaphragm between the wireless data acquisition module and the two pole pieces, and then arranging the wireless data acquisition module on one side of the diaphragm between the two pole pieces. And acquiring a temperature signal inside the battery through the wireless data acquisition module. The internal temperature signals of the battery, which are acquired externally through equipment such as a wireless data acquisition instrument and battery management system hardware integrated with wireless data acquisition, can be directly transmitted to a battery management system and a battery thermal management system after data processing, so that the function of wirelessly monitoring the internal temperature of the battery in situ is realized.
Further description is made below with reference to the accompanying drawings.
Referring to the attached drawings 1-3, the temperature signal inside the battery pole piece acquired by the ultra-micro wireless data acquisition module is transmitted to an external wireless receiving end through wireless data by embedding the ultra-micro wireless data acquisition module in the pole piece or placing the ultra-micro wireless data acquisition module between the two pole pieces, and the temperature signal is transmitted to a battery management system and a battery thermal management system after data processing, so that the wireless in-situ monitoring of the internal temperature of the battery is realized.
The ultra-micro wireless data acquisition module comprises an ultra-micro temperature acquisition module and a wireless transmission module, the two modules are generally integrated into a whole, the ultra-micro wireless data acquisition module is embedded in the pole piece, and a data receiving end is arranged outside the battery and comprises a data processing module, a wireless receiving module and an interface communicated with other equipment. When the battery temperature monitoring system is used, an ultra-micro wireless data acquisition module in the battery acquires temperature signals in the battery through the ultra-micro temperature acquisition module, converts the electric signals and then transmits the electric signals to an external data receiving end through a wireless transmission module, and the temperature information in the battery is obtained on an external terminal through data processing.
Referring to fig. 4, the external device may collect signals of the internal temperature measurement module through devices such as a battery management system hardware integrated with wireless data collection, and the collected signals may be directly transmitted to the battery management system and the battery thermal management system after data processing, so as to implement a function of wirelessly monitoring the temperature inside the battery in situ. Meanwhile, data can be transmitted to a cloud server through a gateway through the communication function of the battery management system BMS, and then big data safety analysis is carried out subsequently through cloud control.
Referring to the attached drawing 1 and the fiston 2, the ultra-micro wireless data acquisition module is pre-embedded in the battery, and the purpose is that the geometric center of the electrode plate is recommended to be arranged by the ultra-micro wireless data acquisition module under the conditions that the internal environment of the battery is not influenced and the complexity of a battery wire harness is not increased. The battery with the ultra-micro wireless data acquisition module embedded in the wireless in-situ mode is basically the same as a normal battery in terms of other production processes and assembly processes, and only in the coating process, the ultra-micro wireless data acquisition module needs to arrange a sensor in mixed electrode plate slurry before an electrode plate is dried and formed, and then the ultra-micro wireless data acquisition module is dried and formed along with the whole electrode plate. The size requirement of the ultra-miniature wireless data acquisition module is smaller than the thickness of a single pole piece, wherein the size of the ultra-miniature wireless data acquisition module is smaller than 100 micrometers, and the thickness of the pole piece is larger than 100 micrometers. For a typical pole piece is 100 microns or less, while for a thick electrode (>100 microns), the size requirements of the sensor can be relaxed accordingly.
Referring to fig. 3, if the size of the sensor is larger than the thickness of the pole piece and cannot be completely embedded in the slurry of the pole piece, it is considered to add a layer of diaphragm on the other side of the diaphragm between the sensor and the two pole pieces and then to place the sensor on one side of the diaphragm between the two pole pieces, thus eliminating the need to place the sensor before the pole pieces are dried.
The process of placing the wireless temperature acquisition module in the battery can be correspondingly adjusted according to the thickness of the battery pole piece, and can adopt a mode of pre-burying a sensor in the pole piece and a mode of placing the wireless temperature acquisition module between the two pole pieces.
The laboratory single-layer soft package battery consists of an aluminum coating film, a current collector (aluminum foil and copper foil), a positive plate, a negative plate and a diaphragm. For the sensor embedded in the pole piece, the size requirement of the sensor is smaller than the thickness of a single pole piece, the pole piece is less than 100 micrometers, and for the thick electrode (>100 micrometers), the size requirement of the sensor can be correspondingly relaxed. For the requirement of the size of the sensor placed between the two pole pieces, the corresponding size is generally required to be not more than twice the thickness of the single-layer pole piece.
The pole piece of the battery comprises a positive pole piece and a negative pole piece, the ultra-miniature wireless data acquisition module is arranged in the electrode slurry of the positive pole piece, and the ultra-miniature wireless data acquisition module is arranged in the negative pole piece to realize measurement of the internal temperature of the battery.
Claims (10)
1. A method for wirelessly measuring the internal temperature of a battery in situ is characterized in that: the temperature signal acquired by the ultra-micro wireless data acquisition module is transmitted to an external wireless receiving end through wireless data, and is transmitted to a battery management system and a battery thermal management system after data processing, so that wireless in-situ monitoring of the internal temperature of the battery is realized.
2. The method for wireless in-situ measurement of the internal temperature of the battery according to claim 1, wherein: before the battery pole piece is dried and formed, the ultra-micro wireless temperature acquisition module is embedded into wet electrode slurry in advance, and then the ultra-micro wireless temperature acquisition module is dried and formed together with the whole pole piece.
3. The method for wireless in-situ measurement of the internal temperature of the battery according to claim 2, wherein: the size of the ultra-micro wireless temperature acquisition module is smaller than the thickness of the pre-buried pole piece, wherein the size of the ultra-micro wireless temperature acquisition module is smaller than 100 micrometers, and the thickness of the pole piece is larger than 100 micrometers.
4. The method for wireless in-situ measurement of the internal temperature of the battery according to claim 2, wherein: the arrangement position of the ultra-micro wireless temperature acquisition module is the geometric center point of the pole piece.
5. The method for wireless in-situ measurement of the internal temperature of the battery according to claim 1, wherein: when the size of the ultra-micro wireless data acquisition module is larger than the thickness of the pole pieces, a layer of diaphragm is additionally arranged on the other surface of the diaphragm between the ultra-micro wireless data acquisition module and the two pole pieces, and then the ultra-micro wireless data acquisition module is arranged between the two pole pieces and is positioned in the two layers of diaphragms.
6. The method for wireless in-situ measurement of the internal temperature of the battery according to claim 1, wherein: the pole piece comprises a positive pole piece and a negative pole piece, and the ultra-miniature wireless data acquisition module is arranged in the positive pole piece or the negative pole piece.
7. A single-layer soft package battery for realizing wireless in-situ measurement of internal temperature by the method of claims 1-6, which is characterized in that: including mass flow body, positive plate, diaphragm, negative pole piece, the mass flow body be aluminium foil and copper foil, set up respectively in the positive plate and the negative pole piece outside, still including setting up the wireless data acquisition module of super miniature in the battery, this super miniature wireless data acquisition module is used for adopting the temperature signal in the battery.
8. The single-layer soft package battery for wirelessly measuring the internal temperature in situ according to claim 7, is characterized in that: the ultra-micro wireless data acquisition module is embedded in the pole pieces or is arranged between the two pole pieces.
9. The single-layer soft package battery for wirelessly measuring the internal temperature in situ according to claim 7, is characterized in that: the size of the ultra-miniature wireless data acquisition module embedded in the pole piece is smaller than the thickness of the embedded pole piece, and the arrangement position of the ultra-miniature wireless data acquisition module is the geometric central point of the pole piece.
10. The single-layer soft package battery for wirelessly measuring the internal temperature in situ according to claim 7, is characterized in that: the other side of the diaphragm between the ultra-micro wireless data acquisition module and the two pole pieces is provided with a layer of diaphragm, and the ultra-micro wireless data acquisition module is arranged in the two layers of diaphragms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110934904.1A CN113839112A (en) | 2021-08-16 | 2021-08-16 | Method for wirelessly measuring internal temperature of battery in situ |
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| CN202110934904.1A CN113839112A (en) | 2021-08-16 | 2021-08-16 | Method for wirelessly measuring internal temperature of battery in situ |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782438A (en) * | 2009-01-20 | 2010-07-21 | 鞍山市融庭科技开发有限公司 | Wireless temperature monitoring system device of overheating of electrical device |
| CN204228278U (en) * | 2014-11-10 | 2015-03-25 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of pre-buried lithium battery wireless temperature measurement system |
| CN109186809A (en) * | 2018-06-15 | 2019-01-11 | 超威电源有限公司 | A kind of temperature testing method during lead-acid accumulator is internalized into inside the group of pole |
| CN208751609U (en) * | 2018-08-13 | 2019-04-16 | 上海南月电气自动化有限公司 | A kind of wet acquisition module of wireless temperature measurement |
| CN111628210A (en) * | 2020-04-22 | 2020-09-04 | 北京航空航天大学 | Lithium ion battery supporting in-situ measurement of internal temperature of battery and manufacturing method |
| CN212323099U (en) * | 2020-07-16 | 2021-01-08 | 傲普(上海)新能源有限公司 | Battery pack capable of wirelessly measuring temperature |
-
2021
- 2021-08-16 CN CN202110934904.1A patent/CN113839112A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782438A (en) * | 2009-01-20 | 2010-07-21 | 鞍山市融庭科技开发有限公司 | Wireless temperature monitoring system device of overheating of electrical device |
| CN204228278U (en) * | 2014-11-10 | 2015-03-25 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of pre-buried lithium battery wireless temperature measurement system |
| CN109186809A (en) * | 2018-06-15 | 2019-01-11 | 超威电源有限公司 | A kind of temperature testing method during lead-acid accumulator is internalized into inside the group of pole |
| CN208751609U (en) * | 2018-08-13 | 2019-04-16 | 上海南月电气自动化有限公司 | A kind of wet acquisition module of wireless temperature measurement |
| CN111628210A (en) * | 2020-04-22 | 2020-09-04 | 北京航空航天大学 | Lithium ion battery supporting in-situ measurement of internal temperature of battery and manufacturing method |
| CN212323099U (en) * | 2020-07-16 | 2021-01-08 | 傲普(上海)新能源有限公司 | Battery pack capable of wirelessly measuring temperature |
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Application publication date: 20211224 |