CN218351529U - Detection device for internal temperature and stress change of lithium ion battery - Google Patents
Detection device for internal temperature and stress change of lithium ion battery Download PDFInfo
- Publication number
- CN218351529U CN218351529U CN202221455849.4U CN202221455849U CN218351529U CN 218351529 U CN218351529 U CN 218351529U CN 202221455849 U CN202221455849 U CN 202221455849U CN 218351529 U CN218351529 U CN 218351529U
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- Prior art keywords
- battery
- ion battery
- miniature
- detection device
- lithium ion
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 41
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 230000008859 change Effects 0.000 title claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 239000011888 foil Substances 0.000 claims abstract description 6
- 229920001721 polyimide Polymers 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 abstract description 4
- 230000004044 response Effects 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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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Abstract
The utility model discloses a detection device for lithium ion battery internal temperature and stress variation, including miniature pressure strain gauge, miniature pin type temperature sensor, integrated sensor signal bus bar, signal data transmission line, quick detach formula interface, information acquisition appearance. The utility model discloses a detection device adopts the stress variation that receives when two miniature foil gauges collection battery receive vibration and extrusion, adopt built-in miniature temperature sensor, the coverage is wider, stress variation gathers accurately, can real-time accurate reaction battery inside actual temperature, real-time data gathers, postpone nature greatly reduced, can effectually take a series of measures as early as possible to prevent the emergence of battery thermal runaway, can be used for surveying the inside real-time temperature variation of battery and steel casing stress variation, it is good to have time portability, measured data is accurate, the real-time is good, response characteristic is good.
Description
Technical Field
The utility model relates to a detection device that is used for inside temperature of lithium ion battery and stress variation.
Background
With the continuous consumption of non-renewable energy, the new energy industry needs to be vigorously developed, wherein battery energy, as a representative of new energy, has gradually become a sunward industry of the new energy industry. The most prominent rechargeable batteries are lithium ion batteries, which have high energy ratio and long cycle life, and particularly lithium polymer batteries, have flexible and changeable shape designs, and can be made into any shapes desired by manufacturers, so that the rechargeable batteries are widely applied in various industries.
The technology of lithium ion batteries is becoming mature, but still has some problems, and people are urgently needed to solve the problems, such as: some chemical and physical characteristics of the lithium ion battery are easy to generate thermal runaway when the lithium ion battery is subjected to excessive vibration and extrusion in the transportation and use processes, and once the thermal runaway occurs, the thermal runaway can cause an unpredictable result due to the high energy ratio, so that the further development of the lithium ion battery is restricted by a series of safety problems. In the field of new energy electric vehicles, lithium ion batteries are widely used as mobile power sources, as is well known, the vehicles have few jolts in the driving process, and certainly, traffic accidents cannot be completely avoided, and the thermal runaway of the lithium ion batteries is easily caused by the collision and jolt, so that disasters are further caused. According to incomplete statistics, 100 electric vehicles have been on fire accidents in 2011, and the accidents have a trend of increasing year by year, and once the accidents happen, the accidents not only bring huge economic loss but also cause casualties.
At present, at home and abroad, a part adopts a soft package lithium ion battery as a power unit of an electric automobile, and a part adopts a steel shell cylindrical lithium ion battery as a power unit, the technology is mature at present and belongs to a Tesla electric automobile.
Present temperature acquisition to the cylinder battery is mostly outside collection, can not in time gather its inside actual temperature variation, will appear great delay error and misalignment like this, exactly the battery can produce stress when receiving vibration and extrusion in addition, causes the battery to warp, appears the diaphragm and impales and make the inside short circuit of battery, and then induces thermal runaway.
Therefore, a detection device capable of collecting the actual temperature change and stress change inside the lithium ion battery in time is needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's is not enough, adopts cylinder lithium ion battery, and integrated sensor signal busbar, information acquisition instrument, miniature foil gage and miniature pin type temperature sensor are as basic component, and mainly used surveys the inside real-time temperature variation of battery and the steel casing stress variation, and it is good to have time portability, measured data is accurate, the real-time is good, response characteristic is good, provides a detection device that is used for lithium ion battery internal temperature and stress variation.
The purpose of the utility model is realized through the following technical scheme: a detection device for internal temperature and stress variations in a lithium ion battery, the detection device comprising: the lithium ion battery comprises a micro pressure strain gauge, a micro needle type temperature sensor, an integrated sensor signal bus bar, a signal data transmission line, a quick-release type interface and an information acquisition instrument, wherein the micro pressure strain gauge and the micro needle type temperature sensor are arranged inside the lithium ion battery, the micro pressure strain gauge and the micro needle type temperature sensor are respectively connected with the signal data transmission line, the signal data transmission line is connected with the integrated sensor signal bus bar through a contact on the integrated sensor signal bus bar, and a stress signal and a temperature signal are integrated together inside the battery.
Preferably, the lithium ion battery is a 21700 cylindrical lithium ion battery.
Preferably, the miniature pressure strain gauge is tightly attached to the inner wall of the cylindrical steel shell of the lithium ion battery.
Preferably, the number of the micro pressure strain gauges is 2, and the micro pressure strain gauges are symmetrically arranged on the inner wall of the steel shell.
Preferably, the micro-needle type temperature sensor is arranged in the center of a winding core in the battery, and the surface of the micro-needle type temperature sensor is wrapped by a layer of polyimide film so as to prevent the micro-needle type temperature sensor from penetrating through a battery diaphragm to cause short circuit of the battery.
Preferably, the micro-needle type temperature sensor is a micro-needle type thermocouple.
Preferably, the integrated sensor signal bus bar is connected with a quick-release interface arranged at the bottom of a steel shell of the lithium ion battery, the quick-release interface comprises a temperature sensor signal interface and a stress signal interface, and the information acquisition instrument is accessed through the quick-release interface to acquire and read data and monitor the state of the battery.
The utility model has the advantages that:
1) The utility model discloses detection device adopts and places cylindrical steel casing in the miniature foil gage to it carries out insulation treatment, convenient and reliable, can real-time supervision battery receive the extrusion and warp, and the coverage is wider, and the stress variation gathers accurately, and real-time data acquisition delay reduces greatly, can effectively take a series of measures as early as possible to prevent the emergence of battery thermal runaway;
2) The micro needle type thermocouple is implanted into the battery and is positioned at the central part of the battery, data acquisition is accurate and timely, no time delay exists, and the actual temperature in the battery can be accurately reflected in real time;
3) Stress signals and thermocouple signals are integrated in the battery, so that the circuit is simplified, and the reliability is improved;
4) The cylindrical steel shell of special design has designed stress and thermocouple signal at its bottom and has connected the quick interface behind the integrated busbar, makes things convenient for the connection information collection appearance.
Drawings
FIG. 1 is a block diagram of the structure of the detecting device of the present invention;
FIG. 2 is a schematic view of the structure of the detecting device of the present invention;
in the figure, 1-lithium ion battery, 2-miniature pressure strain gauge, 3-miniature needle type temperature sensor, 4-signal data transmission line, 5-integrated sensor signal bus bar, 6-temperature sensor signal interface and 7-stress signal interface.
Detailed Description
The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.
The internal structure of the lithium ion battery generally comprises a PTC element, a positive terminal, an exhaust valve, an insulating plate, positive and negative diaphragm winding cores, a connecting part of a negative electrode and a steel shell and the like. The utility model discloses a detection device can be used for in time gathering the inside real temperature variation of lithium ion battery, stress variation, as shown in fig. 1, including miniature pressure strain gauge 2, miniature pin type temperature sensor 3, integrated sensor signal bus bar 5, signal data transmission line 4, quick detach formula interface, information acquisition appearance.
As shown in fig. 2, the micro pressure strain gauge is tightly attached to the inner wall of the specially designed cylindrical steel shell in a built-in mode, and the signal data transmission line 4 is connected to the signal bus bar 5 of the integrated sensor and carries out insulation treatment on the signal bus bar and the signal bus bar; the micro needle type temperature sensor is arranged at the center (the center of a battery roll core) in the lithium ion battery 1, the micro needle type temperature sensor 3 adopts a micro thermocouple and is used for measuring the real temperature change in the battery, and the surface of the micro needle type temperature sensor is wrapped by a layer of polyimide film so as to prevent the micro needle type temperature sensor from piercing a battery diaphragm to cause the short circuit of the battery; the integrated sensor signal bus bar integrates stress change signals and temperature change signal transmission, outputs through a quick-release type interface at the bottom of a specially designed cylindrical steel shell, is connected into an information acquisition instrument, and acquires and reads data.
The specific implementation process comprises the following steps: disassembling an encapsulated 21700 cylindrical lithium ion battery in a vacuum environment, paying attention to the fact that the internal structure of the battery and the connection of the PTC element, the positive terminal, the exhaust valve and the insulating plate are not damaged, facilitating subsequent encapsulation, and carefully taking out the winding cores of the positive and negative diaphragms and the connection part of the negative electrode and the steel shell;
connecting a signal data transmission line of the miniature pressure strain gauge with a signal bus bar contact of the integrated sensor, welding by adopting lead-free soldering tin for effective connection, and carrying out insulation treatment on the lead-free soldering tin;
implanting the connected micro pressure strain gauges and the integrated sensor signal bus bar into the inner wall of a cylindrical steel shell which is designed and established in advance, wherein the two micro pressure strain gauges are symmetrically arranged;
carefully implanting a micro needle type temperature sensor (a micro thermocouple) into the center of a battery roll core, wrapping the surface of the micro needle type temperature sensor by a layer of polyimide film to prevent the surface of the micro needle type temperature sensor from piercing a battery diaphragm to cause battery short circuit, and connecting a signal data transmission line of the micro needle type temperature sensor with a signal bus bar of an integrated sensor;
the battery roll core implanted with the micro thermocouple is arranged in a cylindrical steel shell provided with a micro pressure strain gauge and an integrated sensor signal bus bar, a negative pole lug is connected with a battery negative pole, and then a battery gasket, a PTC element, a positive terminal, an exhaust valve and an insulation plate which are detached before are arranged in a battery positive pole end and connected with a positive pole lug;
sealing is carried out by adding sealant at the upper and lower joints of the cylindrical steel shell, and an insulating film is attached to the periphery of the battery to prevent the steel shell of the battery from contacting with other external conductors to form short circuit; the integrated sensor signal bus bar 5 is connected with a quick-release interface arranged at the bottom of a steel shell of the lithium ion battery, the quick-release interface comprises a temperature sensor signal interface 6 and a stress signal interface 7, a collected transmission signal wire is connected into an information acquisition instrument through the quick-release interface at the bottom of the steel shell of the cylindrical steel shell, and a microcomputer main control unit in the information acquisition instrument collects data in real time and monitors the state of the battery.
The utility model can accurately reflect the actual temperature in the battery in real time; the double micro strain gauges are adopted to collect stress changes of the battery when the battery is vibrated and extruded, the coverage area is wide, and the stress change collection is accurate; the real-time data acquisition delay is greatly reduced, and a series of measures can be effectively taken as early as possible to prevent the thermal runaway of the battery; the micro data acquisition unit can be adopted to monitor each battery unit in real time so as to realize the acquisition of the internal temperature and stress changes of batteries with different quantities and groups.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A detection device for internal temperature and stress change of a lithium ion battery is characterized in that: the detection device includes: miniature pressure foil gage (2), miniature pin type temperature sensor (3), integrated sensor signal bus bar (5), signal data transmission line (4), quick detach formula interface, information acquisition appearance, miniature pressure foil gage (2) and miniature pin type temperature sensor (3) set up inside lithium ion battery (1), miniature pressure foil gage and miniature pin type temperature sensor are connected with signal data transmission line (4) respectively, signal data transmission line passes through the contact on integrated sensor signal bus bar (5) and is connected with integrated sensor signal bus bar, with stress signal and temperature signal inside the battery integrated together.
2. The detection device for internal temperature and stress variations in a lithium-ion battery according to claim 1, characterized in that: the lithium ion battery (1) is a 21700 cylindrical lithium ion battery.
3. The detection device for internal temperature and stress variations in a lithium-ion battery according to claim 1, characterized in that: the miniature pressure strain gauge (2) is tightly attached to the inner wall of the cylindrical steel shell of the lithium ion battery.
4. The detection device for internal temperature and stress variations in lithium-ion batteries according to claim 1 or 3, characterized in that: the number of the micro pressure strain gauges is 2, and the micro pressure strain gauges are symmetrically arranged on the inner wall of the steel shell.
5. The detection device for internal temperature and stress variations in a lithium-ion battery according to claim 1, characterized in that: the miniature needle type temperature sensor (3) is arranged in the center of a winding core in the battery, and the surface of the miniature needle type temperature sensor is wrapped by a layer of polyimide film to prevent the miniature needle type temperature sensor from piercing through a battery diaphragm to cause short circuit of the battery.
6. The apparatus for detecting internal temperature and stress variations in a lithium ion battery of claim 5, wherein: the micro needle type temperature sensor is a micro needle type thermocouple.
7. The detection device for internal temperature and stress variations in a lithium-ion battery according to claim 1, characterized in that: the integrated sensor signal bus bar is connected with a quick-release interface arranged at the bottom of a steel shell of the lithium ion battery, the quick-release interface comprises a temperature sensor signal interface (6) and a stress signal interface (7), and the information acquisition instrument is accessed through the quick-release interface to acquire and read data and monitor the state of the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221455849.4U CN218351529U (en) | 2022-06-09 | 2022-06-09 | Detection device for internal temperature and stress change of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221455849.4U CN218351529U (en) | 2022-06-09 | 2022-06-09 | Detection device for internal temperature and stress change of lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218351529U true CN218351529U (en) | 2023-01-20 |
Family
ID=84922270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221455849.4U Expired - Fee Related CN218351529U (en) | 2022-06-09 | 2022-06-09 | Detection device for internal temperature and stress change of lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218351529U (en) |
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2022
- 2022-06-09 CN CN202221455849.4U patent/CN218351529U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20230120 |