CN108828454A - A kind of lithium battery thermal failure detection system - Google Patents
A kind of lithium battery thermal failure detection system Download PDFInfo
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- CN108828454A CN108828454A CN201810734964.7A CN201810734964A CN108828454A CN 108828454 A CN108828454 A CN 108828454A CN 201810734964 A CN201810734964 A CN 201810734964A CN 108828454 A CN108828454 A CN 108828454A
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- lithium battery
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- detection system
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Abstract
The present invention relates to a kind of lithium battery thermal failure detection systems, including tester, LD laser emitter, high-speed switching circuit, LD bias voltage, impulse generator, display unit, single-chip microcontroller, power module, TDC time-to-digit converter, moment discrimination circuit, amplification and rectification circuit, photodetector, using the method for the ratio of Poisson's ratio, that is, cell cross-section thermal strain amount and battery axial thermal strain amount of the test lithium battery in test temperature section, the thermal failure degree of tested battery is judged by the comparison of the Poisson's ratio data of test data and standard qualified samples.
Description
Technical field
The present invention relates to field of lithium, more particularly, are related to a kind of lithium battery thermal failure detection system.
Background technique
It by lithium metal or lithium alloy is negative electrode material, using the battery of non-aqueous electrolytic solution that lithium battery, which is a kind of,.Due to
The chemical characteristic of lithium metal is very active, so that the processing of lithium metal, preservation, use, very high to environmental requirement.Lithium battery tool
Have that energy density is big, average output voltage is high, and operating temperature range is wide, and cycle performance is superior, can be quickly charged and discharged, output power
Greatly, long service life, be free of the features such as poisonous and harmful substance, referred to as green battery.Currently, lithium battery has been widely used for
Development in the consumption electronic products such as laptop, tablet computer, mobile phone and mobile power source, especially in new-energy automobile field
The impetus is the most powerful.However, thermal runaway is the safety accident of most serious for lithium battery, it can cause lithium battery on fire even
Explosion directly threatens the safety of user.The factor for influencing lithium ion battery thermal runaway can be divided into two, and one is inside battery
Rate of heat production, another is the rate of heat dispation of lithium battery.Traditional thermal analysis tool generally assumes that the heat production of lithium battery exists
It is uniform in whole volume.However, researches show that there are biggish temperature gradients for lithium battery interior, therefore only from battery surface
Temperature is difficult the crash rate that prediction judges battery.Furthermore biggish irregular fever deformation can occur when higher for lithium battery temperature, pass
System will be no longer applicable in by Fourier law calculating thermal conductivity come the method for predicting battery failure degree, therefore develop a kind of letter
Single, reliable, efficient lithium battery thermal failure detection system for electronic industrial products manufacture with promote with important practical
Value.
Summary of the invention
The present invention provides a kind of lithium battery thermal failure detection system to solve deficiencies of the prior art,
By the measurement of heat distortion amount judge tested lithium battery whether thermal failure, there are the spies such as structure is simple, highly reliable, high-efficient
Point, in order to achieve the above objectives, the present invention is achieved through the following technical solutions：
A kind of lithium battery thermal failure detection system, including tester, LD laser emitter, high-speed switching circuit, LD bias voltage,
Impulse generator, display unit, single-chip microcontroller, power module, TDC time-to-digit converter, moment discrimination circuit, amplification shaping electricity
Road, photodetector, it includes laser, top cover, sleeve, laser stent, screw thread that wherein tester, which is the core component of system,
Mandril, V-block clamping plate, spring, slideway end cap, slideway, pedestal, heating tube, lithium battery, power module are that entire test macro mentions
It include rectifier equipment, DC distribution equipment, direct-current-alternating-current converter for driving electric energy.Test macro uses single-chip microcontroller for control
Device generates single pulse signal by impulse generator and controls high-speed switching circuit, and LD bias voltage drives high-speed switching circuit
Closure and interruption, LD laser transmitter projects laser to tester, reflection signal are collected through photodetector by amplification shaping
Circuit removes noise wave removing, and time interval digital signal is penetrated single-chip microcontroller by moment discrimination circuit and TDC time-to-digit converter
It is interior, the parameters such as heat distortion amount, Poisson's ratio, the failure degree of tested battery are shown by display unit.Tester is mainly by top cover, set
Cylinder, pedestal three parts form, and rectangle slideway is welded on pedestal, and slideway end cap is connected by screw and slideway, and V-block clamping plate is inserted
Enter in the rectangular channel in slideway, can inwardly hold out against V-block clamping plate by rotating threaded mandrel, spring one end and V-block clamping plate weld
It connecing, the other end and slideway end cap, tested lithium battery are placed on the round boss of pedestal and are fixed clamping by V-block clamping plate,
Laser is integrated with the function of LD laser emitter and photodetector, and is fixed by screws in pedestal and by pedestal
The laser signal of circular through hole acquisition battery bottom heat distortion amount at the heart, sleeve are connected through a screw thread with pedestal, sleeve cylinder
Be machined on symmetrical four buses on face 8 through-holes for install 8 lasers, laser is fixed by screws in laser
On bracket, the laser signal of the heat distortion amount of different location on cell height direction, laser stent bottom are acquired by through-hole
It is processed into cambered surface, cambered surface curvature is identical as sleeve cylinder, and is fixed by screws on sleeve cylinder, and top cover and sleeve are logical
Threaded connection is crossed, laser is fixed by screws in the laser signal for acquiring battery top heat distortion amount on top cover by through-hole,
Heating tube is inserted into sleeve by top cover, and for heating the environment temperature of lithium battery, in practical applications, battery thermal failure is main
It is to cause internal pressure is excessive to cause the fusing injection of inside battery material since internal quantity of heat production is excessive.This system can test lithium electricity
The ratio of pond Poisson's ratio, that is, cell cross-section thermal strain amount in test temperature section and battery axial thermal strain amount, passes through test
The thermal failure degree of the Poisson's ratio data of data and standard qualified samples compared to judge tested battery.
Further, laser of the present invention uses high precision CMOS laser displacement sensor LK-G30/G35 system
Column, ranging range 25mm ~ 50mm, measurement accuracy 2um, sampling time interval 3ms-33ms.
Further, as a specific structural form, tube chamber welds with base of the present invention has rectangle slideway, laser
It is fixed by screws in pedestal and acquires by the circular through hole at base center the laser signal of battery bottom heat distortion amount,
Sleeve（103）It is connected through a screw thread with pedestal, lithium battery is placed on the round boss of pedestal and by V-block clamping plate（107）Quilt
It fixes to clamp, pedestal uses Al2O3Thermally insulative ceramic material passes through hot press casting forming.
Further, as a specific structural form, sleeve of the present invention uses Al2O3Thermally insulative ceramic material
Be machined on symmetrical four buses by hot press casting forming, on sleeve cylinder 8 through-holes for install 8 laser
Device, sleeve top are connect by internal screw thread with top cover.
Further, as a specific structural form, top cover of the present invention is fixed laser by screw
On top cover, the laser signal of battery top heat distortion amount is acquired by the through-hole of top cap central, heating tube is inserted through top cover
It is inserted into sleeve and heats lithium battery, the uniformly distributed exhaust hole that diameter is 0.5mm ~ 1.5 is machined on top cover, top cover uses Al2O3
Thermally insulative ceramic material passes through hot press casting forming.
Further, as a specific structural form, the rectangle in V-block clamping plate insertion slideway of the present invention
In slot, V-block clamping plate can be inwardly held out against by rotating threaded mandrel, spring one end and V-block clamping plate weld, the other end and slideway
End cap, tested lithium battery are placed on the round boss of pedestal and are fixed clamping by V-block clamping plate.
Detailed description of the invention
Below with attached drawing, the present invention is further illustrated, but the embodiment in attached drawing is not constituted to the present invention
Any restrictions.
Fig. 1 is that a kind of function of lithium battery thermal failure detection system of the invention forms figure；
Fig. 2 is a kind of tester explosive view of lithium battery thermal failure detection system of the invention；
Fig. 3 is a kind of main view of the tester general assembly drawing of lithium battery thermal failure detection system of the invention；
Fig. 4 is a kind of left view of the tester general assembly drawing of lithium battery thermal failure detection system of the invention；
Fig. 5 is a kind of top view of the tester general assembly drawing of lithium battery thermal failure detection system of the invention；
Fig. 6 is a kind of main view of the top cover of the tester of lithium battery thermal failure detection system of the invention；
Fig. 7 is a kind of left view of the top cover of the tester of lithium battery thermal failure detection system of the invention；
Fig. 8 is a kind of top view of the top cover of the tester of lithium battery thermal failure detection system of the invention；
Fig. 9 is a kind of main view of the sleeve of the tester of lithium battery thermal failure detection system of the invention；
Figure 10 is a kind of left view of the sleeve of the tester of lithium battery thermal failure detection system of the invention；
Figure 11 is a kind of top view of the sleeve of the tester of lithium battery thermal failure detection system of the invention；
Figure 12 is a kind of top view of the laser stent of the tester of lithium battery thermal failure detection system of the invention；
Figure 13 is a kind of top view of the laser stent of the tester of lithium battery thermal failure detection system of the invention；
Figure 14 is a kind of top view of the laser stent of the tester of lithium battery thermal failure detection system of the invention；
Figure 15 is a kind of top view of the threaded mandrel of the tester of lithium battery thermal failure detection system of the invention；
Figure 16 is a kind of top view of the threaded mandrel of the tester of lithium battery thermal failure detection system of the invention；
Figure 17 is a kind of top view of the threaded mandrel of the tester of lithium battery thermal failure detection system of the invention；
Figure 18 is a kind of top view of the V-block clamping plate of the tester of lithium battery thermal failure detection system of the invention；
Figure 19 is a kind of top view of the V-block clamping plate of the tester of lithium battery thermal failure detection system of the invention；
Figure 20 is a kind of top view of the V-block clamping plate of the tester of lithium battery thermal failure detection system of the invention；
Figure 21 is a kind of main view of the slideway end cap of the tester of lithium battery thermal failure detection system of the invention；
Figure 22 is a kind of left view of the slideway end cap of the tester of lithium battery thermal failure detection system of the invention；
Figure 23 is a kind of top view of the slideway end cap of the tester of lithium battery thermal failure detection system of the invention；
Figure 24 is a kind of main view of the pedestal of the tester of lithium battery thermal failure detection system of the invention；
Figure 25 is a kind of left view of the pedestal of the tester of lithium battery thermal failure detection system of the invention；
Figure 26 is a kind of top view of the pedestal of the tester of lithium battery thermal failure detection system of the invention；
Figure 27 is a kind of test data comparison diagram of the tester of lithium battery thermal failure detection system of the invention.
Specific embodiment
In order that the present invention can be more clearly and readily understood, right below according to specific embodiment and in conjunction with attached drawing
The present invention is described in further details.
As shown in Fig. 1 ~ 26, a kind of lithium battery thermal failure detection system that the present invention designs includes tester（1）, LD laser
Transmitter（2）, high-speed switching circuit（3）, LD bias voltage（4）, impulse generator（5）, display unit（6）, single-chip microcontroller（7）,
Power module（8）, TDC time-to-digit converter（9）, moment discrimination circuit（10）, amplification and rectification circuit（11）, photodetector
（12）, wherein tester（1）Including laser（101）, top cover（102）, sleeve（103）, laser stent（104）, screw thread top
Bar（105）, V-block clamping plate（106）, spring（107）, slideway end cap（108）, slideway（109）, pedestal（110）, heating tube
（111）, lithium battery（112）, power module（8）There is provided driving electric energy for entire test macro includes rectifier equipment, DC distribution
Equipment, direct-current-alternating-current converter.Test macro uses single-chip microcontroller（7）For controller, pass through impulse generator（5）Generate pulse
Signal controls high-speed switching circuit（3）, LD bias voltage（4）Drive high-speed switching circuit（3）, LD laser emitter（2）Transmitting
Laser is to tester（1）, signal is reflected through photodetector（12）It collects and passes through amplification and rectification circuit（11）Noise wave removing is removed, is passed through
Moment discrimination circuit（10）With TDC time-to-digit converter（9）Time interval digital signal is penetrated into single-chip microcontroller（7）It is interior, pass through
Display unit（6）Show the parameters such as heat distortion amount, Poisson's ratio, the failure degree of tested battery.Tester（1）Mainly by top cover
（102）, sleeve（103）, pedestal（110）Three parts composition, pedestal（110）On be welded with rectangle slideway（109）, slideway end cap
（108）Pass through screw and slideway（109）It is connected, V-block clamping plate（107）It is inserted into slideway（109）In interior rectangular channel, pass through rotation
Threaded mandrel（105）V-block clamping plate can inwardly be held out against（107）, spring（107）One end and V-block clamping plate（107）Welding, it is another
End and slideway end cap（108）, it is tested lithium battery（112）It is placed on pedestal（110）Round boss on and pass through V-block clamping plate
（107）It is fixed clamping, laser（101）It is integrated with LD laser emitter（2）With photodetector（12）Function, and pass through
Screw is fixed on pedestal（110）Laser letter interior and that battery bottom heat distortion amount is acquired by the circular through hole at base center
Number, laser stent（104）It is processed into cambered surface, cambered surface curvature and sleeve in bottom（103）Cylindrical surface is identical, and is fixed by screw
In sleeve（103）On cylindrical surface, sleeve（103）With pedestal（110）It is connected through a screw thread, sleeve（103）It is symmetrical on cylindrical surface
Be machined on four buses 8 through-holes for place 8 lasers（101）, laser（101）It is fixed by screws in laser
Bracket（104）On, laser stent（104）It is fixed by screws in sleeve（103）On cylindrical surface, it is high that battery is acquired by through-hole
Spend the laser signal of the heat distortion amount of different location on direction, top cover（102）With sleeve（103）It is connected through a screw thread, laser
（101）It is fixed by screws in top cover（102）The upper laser signal that battery top heat distortion amount is acquired by through-hole, heating tube
（111）It is inserted through top cover（102）It is inserted into sleeve（103）It is interior, for heating lithium battery（112）Environment temperature.
It is as shown in figure 27 a kind of test data comparison diagram of the tester of lithium battery thermal failure detection system, solid line is mark
The Poisson's ratio variation with temperature curve of quasi- spec battery, dotted line are the Poisson's ratio curve of the higher tested battery of thermal failure degree,
Battery is tested at 210 DEG C or so, Poisson's ratio starts to surmount standard curve, and there are larger thermal failure degree.
Working principle of the present invention is as follows：By tested lithium battery（112）Inserted base（110）, lithium battery（112）Center
It is directed at pedestal（110）Boss center, passes through threaded mandrel（105）Hold out against V-block clamping plate（107）, make V-block clamping plate（107）Folder
Tightly tested battery, by sleeve（103）With pedestal（110）It is connected through a screw thread, by heating tube（111）It is inserted into top cover（102）After lead to
Cross screw thread and sleeve（103）Connection, pedestal（110）With top cover（102）Laser is installed at center（101）For acquiring, lithium
Battery（112）The analog signal of Axial Thermal dependent variable.Sleeve（103）8 are machined on cylindrical surface on symmetrical four buses to lead to
Hole is for placing 8 lasers（101）For acquiring lithium battery（112）The analog signal of the thermal strain amount of axial cross section swashs
Light device（101）The analog signal of output is through photodetector（12）It collects and passes through amplification and rectification circuit（11）Noise wave removing is removed, is passed through
Moment discrimination circuit（10）With TDC time-to-digit converter（9）Time interval digital signal is penetrated into single-chip microcontroller（7）It is interior, pass through
Display unit（6）It shows the parameters such as heat distortion amount, Poisson's ratio, the failure degree of tested battery, judges tested lithium by data comparison
Battery（112）Failure degree.
The above is only the preferred embodiment of the present invention, therefore cannot successively limit the scope of implementation of the present invention, i.e., according to
The equivalent changes and modifications that the invention patent range and description are done, should still be within the scope of the present invention.
Claims (8)
1. a kind of lithium battery thermal failure detection system, including tester（1）, LD laser emitter（2）, high-speed switching circuit（3）,
LD bias voltage（4）, impulse generator（5）, display unit（6）, single-chip microcontroller（7）, power module（8）, TDC time-to-digital converter
Device（9）, moment discrimination circuit（10）, amplification and rectification circuit（11）, photodetector（12）, wherein tester（1）Including laser
Device（101）, top cover（102）, sleeve（103）, laser stent（104）, threaded mandrel（105）, V-block clamping plate（106）, spring
（107）, slideway end cap（108）, slideway（109）, pedestal（110）, heating tube（111）, lithium battery（112）, power module（8）For
It includes rectifier equipment, DC distribution equipment, direct-current-alternating-current converter that entire test macro, which provides driving electric energy, and test macro uses
Single-chip microcontroller（7）For controller, pass through impulse generator（5）It generates single pulse signal and controls high-speed switching circuit（3）, LD biased electrical
Pressure（4）Drive high-speed switching circuit（3）, LD laser emitter（2）Emit laser to tester（1）, reflect signal and visited through photoelectricity
Survey device（12）It collects and passes through amplification and rectification circuit（11）Noise wave removing is removed, moment discrimination circuit is passed through（10）Turn with TDC time figure
Parallel operation（9）Time interval digital signal is penetrated into single-chip microcontroller（7）It is interior, pass through display unit（6）Show the thermal deformation of tested battery
The parameters such as amount, Poisson's ratio, failure degree, tester（1）Mainly by top cover（102）, sleeve（103）, pedestal（110）Three parts group
At pedestal（110）On be welded with rectangle slideway（109）, slideway end cap（108）Pass through screw and slideway（109）It is connected, V-block
Clamping plate（107）It is inserted into slideway（109）In interior rectangular channel, by rotating threaded mandrel（105）V-block clamping plate can inwardly be held out against
（107）, spring（107）One end and V-block clamping plate（107）Welding, the other end and slideway end cap（108）, it is tested lithium battery（112）
It is placed on pedestal（110）Round boss on and pass through V-block clamping plate（107）It is fixed clamping, laser（101）It is solid by screw
It is scheduled on pedestal（110）It is interior and pass through pedestal（110）The laser signal of circular through hole acquisition battery bottom heat distortion amount at center,
Sleeve（103）With pedestal（110）It is connected through a screw thread, sleeve（103）8 are machined on cylindrical surface on symmetrical four buses to lead to
Hole is for placing 8 lasers（101）, laser（101）It is fixed by screws in laser stent（104）On, laser branch
Frame（104）It is fixed by screws in sleeve（103）On cylindrical surface, the heat of different location on cell height direction is acquired by through-hole
The laser signal of deflection, top cover（102）With sleeve（103）It is connected through a screw thread, laser（101）It is fixed by screws in top
Lid（102）The upper laser signal that battery top heat distortion amount is acquired by through-hole, heating tube（111）It is inserted through top cover（102）
It is inserted into sleeve（103）Interior heating lithium battery（112）.
2. a kind of lithium battery thermal failure detection system according to claim 1, it is characterised in that the laser（101）
Using high precision CMOS laser displacement sensor LK-G30/G35 series, ranging range 25mm ~ 50mm, measurement accuracy 2um are adopted
Sample time interval 3ms-33ms.
3. a kind of lithium battery thermal failure detection system according to claim 1, it is characterised in that the pedestal（110）Weldering
It is connected to rectangle slideway（109）, laser（101）It is fixed by screws in pedestal（110）It is interior and pass through pedestal（110）At center
Circular through hole acquires the laser signal of battery bottom heat distortion amount, sleeve（103）With pedestal（110）It is connected through a screw thread, lithium electricity
Pond（112）It is placed on pedestal（110）Round boss on and pass through V-block clamping plate（107）It is fixed clamping, pedestal（110）Using
Al2O3Thermally insulative ceramic material passes through hot press casting forming.
4. a kind of lithium battery thermal failure detection system according to claim 1, it is characterised in that the sleeve（103）It adopts
Use Al2O3Thermally insulative ceramic material passes through hot press casting forming, sleeve（103）8 are machined on symmetrical four buses on cylindrical surface
A through-hole is for placing 8 lasers（101）, sleeve（103）Top passes through internal screw thread and top cover（102）Connection.
5. a kind of lithium battery thermal failure detection system according to claim 1, it is characterised in that the top cover（102）It is logical
Screw is crossed by laser（101）It is fixed on top cover（102）On, pass through top cover（102）The through-hole at center acquires battery top thermal change
The laser signal of shape amount, heating tube（111）It is inserted through top cover（102）It is inserted into sleeve（103）Interior heating lithium battery（112）, top
Lid（102）On be machined with diameter be 0.5mm ~ 1.5 uniformly distributed exhaust hole, top cover（102）Using Al2O3Thermally insulative ceramic material
Pass through hot press casting forming.
6. a kind of lithium battery thermal failure detection system according to claim 1, it is characterised in that the V-block clamping plate
（107）It is inserted into slideway（109）In interior rectangular channel, by rotating threaded mandrel（105）V-block clamping plate can inwardly be held out against（107）,
Spring（107）One end and V-block clamping plate（107）Welding, the other end and slideway end cap（108）, it is tested lithium battery（112）It is placed on bottom
Seat（110）Round boss on and pass through V-block clamping plate（107）It is fixed clamping.
7. a kind of lithium battery thermal failure detection system according to claim 1, it is characterised in that the laser stent
（104）It is processed into cambered surface, cambered surface curvature and sleeve in bottom（103）Cylindrical surface is identical.
8. a kind of lithium battery thermal failure detection system, it is characterised in that utilize Poisson's ratio of the test lithium battery in test temperature section
That is the method for the ratio of cell cross-section thermal strain amount and battery axial thermal strain amount, passes through test data and standard qualified samples
The comparisons of Poisson's ratio data judge the thermal failure degree of tested battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810734964.7A CN108828454A (en) | 2018-07-06 | 2018-07-06 | A kind of lithium battery thermal failure detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810734964.7A CN108828454A (en) | 2018-07-06 | 2018-07-06 | A kind of lithium battery thermal failure detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108828454A true CN108828454A (en) | 2018-11-16 |
Family
ID=64136168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810734964.7A Withdrawn CN108828454A (en) | 2018-07-06 | 2018-07-06 | A kind of lithium battery thermal failure detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111103404A (en) * | 2019-12-23 | 2020-05-05 | 国联汽车动力电池研究院有限责任公司 | Analysis device and method for thermal runaway tail gas of power battery |
-
2018
- 2018-07-06 CN CN201810734964.7A patent/CN108828454A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111103404A (en) * | 2019-12-23 | 2020-05-05 | 国联汽车动力电池研究院有限责任公司 | Analysis device and method for thermal runaway tail gas of power battery |
| CN111103404B (en) * | 2019-12-23 | 2023-12-05 | 国联汽车动力电池研究院有限责任公司 | Analysis device and method for thermal runaway tail gas of power battery |
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Application publication date: 20181116 |
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