CN106404722B - The detection device and method of lithium ion battery separator closed pore temperature - Google Patents
The detection device and method of lithium ion battery separator closed pore temperature Download PDFInfo
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- CN106404722B CN106404722B CN201610958814.5A CN201610958814A CN106404722B CN 106404722 B CN106404722 B CN 106404722B CN 201610958814 A CN201610958814 A CN 201610958814A CN 106404722 B CN106404722 B CN 106404722B
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- diaphragm
- light transmittance
- closed pore
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- 239000011148 porous material Substances 0.000 title claims abstract description 100
- 238000001514 detection method Methods 0.000 title claims abstract description 72
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000002834 transmittance Methods 0.000 claims abstract description 124
- 238000013507 mapping Methods 0.000 claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims description 11
- 238000013021 overheating Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 3
- 239000013068 control sample Substances 0.000 claims 1
- 239000000523 sample Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 10
- 238000012360 testing method Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000036760 body temperature Effects 0.000 abstract description 3
- 230000000930 thermomechanical effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
Abstract
The present invention provides a kind of detection devices of lithium ion battery separator closed pore temperature, it is intended to solve the problems, such as that existing testing cost is high.The detection device includes light source, condenser, temperature-controlled box and detector, diaphragm to be detected first is fixed in temperature-controlled box, the light beam that light source issues is exposed to after condenser on diaphragm to be detected, then temperature-controlled box controls itself case body temperature and changes, diaphragm to be detected is set constantly to heat up, in temperature-rise period, detector changes according to the light transmittance that light beam penetrates diaphragm, the mapping relations between temperature and light transmittance are calculated, to map the closed pore temperature to determine diaphragm based on the temperature and light transmittance.Device manufacturing simple process provided by the present invention, and manufacturing cost is cheap, so that the testing cost of lithium ion battery separator closed pore temperature reduces, while detection process is very simple.
Description
Technical field
The invention belongs to the detection device of battery detecting field more particularly to a kind of lithium ion battery separator closed pore temperature and
Method.
Background technique
Lithium ion battery be usually by lithium alloy metals oxide anode material, graphite cathode material, nonaqueous electrolyte and
Diaphragm composition.Wherein, battery diaphragm is to ensure that one of the key building block of lithium battery security performance, it separates positive and negative plate,
The two poles of the earth contact short circuit is prevented, meanwhile, it also has the function of electrolyte ion capable of being made to pass through, its performance superiority and inferiority directly affects
The comprehensive performance of lithium ion battery.When overcharging or temperature increases, when temperature reaches the closed pore temperature of diaphragm, diaphragm
Passing through for lithium ion can be obstructed by shrinking closed pore, so that the internal resistance of cell steeply rises and avoids further thermal runaway
Generation, prevent explosion on fire, the high temperature closed pore performance of diaphragm improves safety of the lithium ion battery in routine use.
Therefore, the closed pore temperature of diaphragm is the important detection of diaphragm safety, and guarantee safety applied to lithium ion battery
Overriding concern index.
Currently, to the closed pore temperature of lithium ion battery separator, there are no the detecting instruments of standard and detection method to advise in industry
Model, main detecting instrument have thermomechanical analyzer.Thermomechanical analyzer main operational principle be thermo-mechanical analysis (TMA,
Thermo Mechanical Analysis), TMA is to carry out the method for dynamics measurement to sample during heating to detect.
Thermomechanical analyzer is based on TMA technology, under program temperature and under the effect of non-shock loads, when measuring the deformation and temperature of sample
Between equal functions relationship, the parameters such as main coefficient of expansion for measuring sample and phase transition temperature.But thermomechanical analyzer manufactures
Therefore complex process uses thermomechanical analyzer high as the detecting instrument manufacturing cost of diaphragm closed pore temperature, so that existing
The testing cost of diaphragm closed pore temperature is very high.
Summary of the invention
The present invention provides the detection device and method of a kind of lithium ion battery separator closed pore temperature, it is intended to solve existing inspection
Survey problem at high cost.
To solve the above problems, the invention is realized in this way.The present invention provides a kind of lithium ion battery separator closed pores
The detection device of temperature, described device include: light source, condenser, temperature-controlled box and detector；
Diaphragm to be detected is fixed on the sample placement location in the temperature-controlled box；
The light source exposes to the condenser for issuing detection light；
The condenser exposes to the diaphragm to be detected for the light to be aggregated into collimated light beam；
The temperature-controlled box is used for the intracorporal temperature of control cabinet, so that the diaphragm persistently overheating to be detected；
The detector reaches institute in the diaphragm temperature-rise period to be detected, will transmit through the diaphragm to be detected
The optical signal for stating the light beam of detector is converted into electric signal, and establishes the mapping relations of temperature and light transmittance, so as to based on described
Temperature and the mapping relations of light transmittance determine the closed pore temperature of the diaphragm to be detected.
Further, the detector is also used to draw temperature and light transmission based on the temperature and the mapping relations of light transmittance
Rate curve graph, and the Magnification of light transmittance in the temperature and light transmittance curve figure is less than corresponding to the initial point of default value
Temperature value be determined as the closed pore temperature of the diaphragm to be detected.
Further, the detector is also used in the temperature and light transmittance curve figure, and light transmittance increases to suddenly
Temperature value corresponding to the initial point of maximum value is determined as the broken film temperature of the diaphragm to be detected.
Further, the detection light that the light source issues is composite visible light line.
Further, the detector is connect with display, is used for the temperature and light transmittance curve figure or closed pore temperature
Degree or broken film temperature or closed pore temperature and broken film temperature or temperature are with light transmittance curve figure and closed pore temperature or temperature and thoroughly
Light rate curve graph and broken film temperature or temperature and light transmittance curve figure, closed pore temperature and broken film temperature are transmitted to the display
Display.
The present invention also provides a kind of detection method of lithium ion battery separator closed pore temperature, the method is applied to above
The detection device of the lithium ion battery separator closed pore temperature, and the sample that diaphragm to be detected is fixed in the temperature-controlled box is put
Seated position, which comprises
Light source issues detection light and exposes to condenser；
The light is aggregated into collimated light beam and exposed on the diaphragm to be detected by the condenser；
The intracorporal temperature of temperature-controlled box control cabinet, so that the diaphragm persistently overheating to be detected；
Detector will transmit through the diaphragm to be detected and reach the detector in the diaphragm temperature-rise period to be detected
The optical signal of light beam is converted into electric signal, and establishes the mapping relations of temperature and light transmittance, to be based on the temperature and light transmission
The mapping relations of rate determine the closed pore temperature of the diaphragm to be detected.
Further, the method also includes: the detectors is drawn based on the temperature and the mapping relations of light transmittance
Temperature and light transmittance curve figure, and the Magnification of light transmittance in the temperature and light transmittance curve figure is less than the first of default value
Temperature value corresponding to initial point is determined as the closed pore temperature of the diaphragm to be detected.
Further, the method also includes: the detectors by the temperature and light transmittance curve figure, and light transmittance is prominent
So increase to the broken film temperature that temperature value corresponding to the initial point of maximum value is determined as the diaphragm to be detected.
Further, the detection light that institute's light source issues is composite visible light line.
Further, the detector is connect with display, by the temperature and light transmittance curve figure or closed pore temperature,
Or broken film temperature or closed pore temperature and broken film temperature or temperature and light transmittance curve figure and closed pore temperature or temperature and light transmittance
Curve graph and broken film temperature or temperature and light transmittance curve figure, closed pore temperature and broken film temperature are transmitted to the display and show.
Compared with prior art, the present invention beneficial effect is: the present invention provides a kind of lithium ion battery separator closed pores
The detection device of temperature, detection device include light source, condenser, temperature-controlled box and detector, and diaphragm to be detected first is fixed on
In temperature-controlled box, the light beam that light source issues is exposed to after condenser on diaphragm to be detected, and then temperature-controlled box controls in itself cabinet
Temperature changes, and diaphragm to be detected is made constantly to heat up, and in temperature-rise period, detector penetrates the light transmittance of diaphragm according to light beam
Variation, calculates the mapping relations between temperature and light transmittance, to be mapped based on the temperature and light transmittance to determine diaphragm
Closed pore temperature.Device manufacturing simple process provided by the present invention, and manufacturing cost is cheap, so that lithium ion battery separator closed pore
The testing cost of temperature reduces, while detection process is very simple.
Detailed description of the invention
Fig. 1 is the detection device schematic diagram for the lithium ion battery separator closed pore temperature that first embodiment of the invention provides；
Fig. 2 is the detection device schematic diagram for the lithium ion battery separator closed pore temperature that second embodiment of the invention provides；
Fig. 3 is the detection method flow chart for the lithium ion battery separator closed pore temperature that third embodiment of the invention provides；
Fig. 4 is the detection method flow chart for the lithium ion battery separator closed pore temperature that fourth embodiment of the invention provides；
Fig. 5 is different temperatures lower diaphragm plate light transmittance variation schematic diagram provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As one embodiment of the invention, as shown in Figure 1, the lithium ion battery provided for first embodiment of the invention
The detection device schematic diagram of diaphragm closed pore temperature.Described device includes: light source 101, condenser 102, temperature-controlled box 103 and detection
Device 104；
Diaphragm to be detected is fixed on the sample placement location in temperature-controlled box 103；
Light source 101 exposes to condenser 102 for issuing detection light；
Condenser 102 exposes to diaphragm to be detected for the light to be aggregated into collimated light beam；
Temperature-controlled box 103 is used for the intracorporal temperature of control cabinet, so that diaphragm to be detected is persistently overheating；
Detector 104 is used in diaphragm temperature-rise period to be detected, will transmit through the light that diaphragm to be detected reaches detector 104
The optical signal of beam is converted into electric signal, and establishes the mapping relations of temperature and light transmittance, so as to based on the temperature and light transmittance
Mapping relations determine the closed pore temperature of diaphragm to be detected.
Wherein, detector 104 may include signal amplifying function, for example, signal amplifier is integrated on detector 104.
Detector 104 converts optical signal into after electric signal, the electric signal can be done enhanced processing, be then based on amplified telecommunications
Number establish the mapping relations of temperature and light transmittance.
As shown in figure 5, changing schematic diagram for different temperatures lower diaphragm plate light transmittance provided in an embodiment of the present invention.From Fig. 5
As can be seen that the light transmittance of diaphragm is directly proportional to diaphragm temperature, translucent effect of the diaphragm at 145 DEG C is apparently higher than diaphragm 90
DEG C translucent effect.Because diaphragm sample is as the temperature rises, since the micropore of diaphragm is closed, light is on the surface of the diaphragm
The diffusing reflection of generation is reduced, so that the light transmittance of light is higher and higher, therefore, diaphragm seems more and more transparent.
In conclusion the detection device of lithium ion battery separator closed pore temperature provided by the present invention, with by detection every
Light transmittance of the film in temperature-rise period be design principle, detection device include light source 101, condenser 102, temperature-controlled box 103 and
Detector 104, diaphragm to be detected first are fixed in temperature-controlled box 103, and the light beam that light source 101 issues irradiates after condenser 102
On to diaphragm to be detected, then temperature-controlled box 103 controls itself case body temperature and changes, and diaphragm to be detected is made constantly to heat up,
In temperature-rise period, detector 104 changes according to the light transmittance that light beam penetrates diaphragm, calculates reflecting between temperature and light transmittance
Relationship is penetrated, to map the closed pore temperature to determine diaphragm based on the temperature and light transmittance.Device manufacturing provided by the present invention
Simple process, and manufacturing cost is cheap, so that the testing cost of lithium ion battery separator closed pore temperature reduces, while detection process
It is very simple.
As second embodiment of the invention, as shown in Fig. 2, the lithium ion battery provided for second embodiment of the invention
The detection device schematic diagram of diaphragm closed pore temperature.The detection device 11 include: light source 101, condenser 102, temperature-controlled box 103 with
And detector 104；Diaphragm to be detected is fixed on the sample placement location in temperature-controlled box 103；Light source 101 is for issuing detection light
Expose to condenser 102；Condenser 102 exposes to diaphragm to be detected for the light to be aggregated into collimated light beam；Temperature control
Case 103 is used for the intracorporal temperature of control cabinet, so that diaphragm to be detected is persistently overheating；Detector 104 is used in diaphragm liter to be detected
During temperature, the optical signal that will transmit through the light beam that diaphragm to be detected reaches detector 104 is converted into electric signal, and establish temperature with
The mapping relations of light transmittance, to determine the closed pore temperature of diaphragm to be detected based on the mapping relations of the temperature and light transmittance.
Wherein, detector 104 may include signal amplifying function, for example, signal amplifier is integrated on detector 104.
Detector 104 converts optical signal into after electric signal, the electric signal can be done enhanced processing, be then based on amplified telecommunications
Number establish the mapping relations of temperature and light transmittance.
Further, detector 104 is also used to draw temperature based on temperature and the mapping relations of light transmittance and light transmittance is bent
Line chart, and the Magnification of light transmittance in temperature and light transmittance curve figure is less than temperature value corresponding to the initial point of default value
It is determined as the closed pore temperature of the diaphragm to be detected.Wherein, the temperature before temperature and light transmittance curve figure are not heated up with diaphragm generally
Degree is initial temperature value, and the light transmittance before not heated up using diaphragm is initial light transmission value.
The light transmittance that the Magnification of above-mentioned light transmittance generally refers to B temperature subtracts the finally obtained difference of light transmittance of A temperature
Value, if the Magnification is greater than the preset value of Magnification, shows the closed pore temperature for not reaching the diaphragm also in diaphragm temperature-rise period
Degree；If the Magnification is less than the preset value of Magnification, shows that diaphragm is mutated, arrived the closed pore temperature of the diaphragm,
Therefore, the Magnification of temperature and light transmittance in light transmittance curve figure is less than temperature value corresponding to the initial point of default value to sentence
It is set to the closed pore temperature of the diaphragm to be detected.Network in emulation experiment, with the raising of diaphragm temperature, inside diaphragm
It can collapse, sample itself reduces the absorptance of light, and light transmittance slowly increases, in temperature and light transmittance curve figure, one
As in the closed pore temperature that the temperature of inflection point that light transmittance increase tends towards stability is diaphragm sample, since the range of the inflection point can not
It is clear, therefore, in embodiments of the present invention using the Magnification of light transmittance as the judgment basis of diaphragm closed pore temperature, i.e., first set
The preset value of one Magnification, if transmitance tend towards stability inflection point when, the Magnification of the point can be less than the preset value of Magnification,
It is can determine that in temperature and light transmittance curve figure at this time, the Magnification of light transmittance is less than temperature corresponding to the initial point of default value
Value is determined as the closed pore temperature of the diaphragm to be detected.
Further, detector 104 is used in temperature and light transmittance curve figure, and light transmittance increases to maximum value suddenly
Temperature value corresponding to initial point is determined as the broken film temperature of the diaphragm to be detected.In emulation experiment, when diaphragm reaches closed pore
After temperature, temperature continues to increase, and sample ruptures, at this point, source of parallel light directly can all penetrate diaphragm, light transmittance wink moment
Between increase to maximum value, which is diaphragm broken film temperature decision-point, i.e. the light transmittance initial point that increases to maximum value suddenly
Corresponding temperature value is determined as the broken film temperature of the diaphragm to be detected.
Further, the detection light that light source 101 issues is composite visible light line.
Further, detector 104 is connect with display 22, is used for temperature and light transmittance curve figure or closed pore temperature,
Or broken film temperature or closed pore temperature and broken film temperature or temperature and light transmittance curve figure and closed pore temperature or temperature and light transmittance
Curve graph and broken film temperature or temperature and light transmittance curve figure, closed pore temperature and broken film temperature are transmitted to the display of display 22.
It should be noted that when internal temperature of battery be more than diaphragm closed pore temperature after further increase when, once reach every
The fusion temperature of film, the melt temperature of diaphragm is broken film temperature at this time.The fusing rupture of diaphragm will lead to positive and negative anodes and directly connect
Touching short circuit, it is possible to the danger such as explosion occur, it is seen that the broken film temperature for detecting diaphragm is also to ensure lithium ion battery security
Inevitable requirement.Therefore, the closed pore temperature of diaphragm and broken film temperature are the important detections of diaphragm safety, and be applied to lithium from
The overriding concern index of sub- cell covers safety.Currently, being typically also to the broken film temperature of lithium ion battery separator in industry
It is detected using thermomechanical analyzer.Likewise, using thermomechanical analyzer as the detecting instrument system of diaphragm broken film temperature
Make it is at high cost so that the testing cost of existing diaphragm broken film temperature is very high.
It should be noted that detector 104 is connect with display 22, shown so that testing result is transmitted on display 22
Show, which can be external, can also be used as a part of detection device 11, i.e., designs display 22 in detection device
Inside 11, in the present invention and without limitation.Display described in second embodiment is as an individual external dress
Set the situation external with detection device.
It is transmitted on display and shows it should be noted that detection device upon completion of the assays, will test result, show at this time
Show that several modes can be set forth below there are many mode in the result shown on device:
Mode 1: temperature-light transmittance curve figure is directly displayed out on display.At this point it is possible to bent by temperature and light transmittance
Change artificial judgement closed pore temperature or broken film temperature in line chart.
Mode 2: the closed pore temperature obtained by calculating analysis is directly transmitted on display and shows by detector, exists at this time
The closed pore temperature of the diaphragm sample can be intuitively seen on display.
Mode 3: detector will directly be transmitted on display by the broken film temperature being calculated and show, show at this time
The broken film temperature of the diaphragm sample can be intuitively seen on device.
Mode 4: detector will directly pass through the closed pore temperature being calculated and broken film temperature is transmitted on display and shows,
It can intuitively see the closed pore temperature and broken film temperature of the diaphragm sample over the display at this time.
Mode 5: closed pore temperature of the detector simultaneously by temperature and light transmittance curve figure and after calculating is transmitted on display
It has been shown that, not only can see temperature and light transmittance curve figure in display at this time, but also can intuitively see closing for the diaphragm sample
Hole temperature and broken film temperature.
Mode 6: detector simultaneously by temperature with after light transmittance curve figure, calculating closed pore temperature and broken film temperature be transmitted to
Display is shown.It is most comprehensive, the most preferred mode for judging lithium ion battery separator testing result under this mode.
In conclusion the detection device of lithium ion battery separator closed pore temperature provided by the present invention, not only can detecte
The closed pore temperature of diaphragm, additionally it is possible to the further broken film temperature of detection diaphragm.And the detection device is compared with prior art, manufacture
Technique is simpler, and manufacturing cost is cheap, so that the testing cost of lithium ion battery separator closed pore temperature or broken film temperature
It reduces, detection process is simple.
As third embodiment of the invention, as shown in figure 3, the lithium ion battery provided for third embodiment of the invention
The detection method flow chart of diaphragm closed pore temperature.This method is applied to the inspection of lithium ion battery separator closed pore temperature recited above
Device is surveyed, and diaphragm to be detected is fixed on the sample placement location in the temperature-controlled box, this method includes the following steps:
Step S101: light source issues detection light and exposes to condenser；
Step S102: the light is aggregated into collimated light beam and exposed on the diaphragm to be detected by condenser；
Step S103: the intracorporal temperature of temperature-controlled box control cabinet, so that the diaphragm persistently overheating to be detected；
Step S104: detector will transmit through the diaphragm to be detected and reach institute in the diaphragm temperature-rise period to be detected
The optical signal for stating the light beam of detector is converted into electric signal, and establishes the mapping relations of temperature and light transmittance, so as to based on described
Temperature and the mapping relations of light transmittance determine the closed pore temperature of the diaphragm to be detected.
In step S104, detector is converted optical signal into after electric signal, which can be done to enhanced processing, so
The mapping relations of temperature and light transmittance are established based on amplified electric signal afterwards.
As shown in figure 5, changing schematic diagram for different temperatures lower diaphragm plate light transmittance provided in an embodiment of the present invention.From Fig. 5
As can be seen that the light transmittance of diaphragm is directly proportional to diaphragm temperature, translucent effect of the diaphragm at 145 DEG C is apparently higher than diaphragm 90
DEG C translucent effect.Because diaphragm sample is as the temperature rises, since the micropore of diaphragm is closed, light is on the surface of the diaphragm
The diffusing reflection of generation is reduced, so that the light transmittance of light is higher and higher, therefore, diaphragm seems more and more transparent.
In conclusion the detection method of lithium ion battery separator closed pore temperature provided by the present invention, with by detection every
Light transmittance of the film in temperature-rise period is design principle, and diaphragm to be detected first is fixed in temperature-controlled box, the light beam that light source issues
Exposed to after condenser on diaphragm to be detected, then temperature-controlled box controls itself case body temperature and changes, make it is to be detected every
Film constantly heats up, and in temperature-rise period, detector changes according to the light transmittance that light beam penetrates diaphragm, calculates temperature and light transmittance
Between mapping relations, to map the closed pore temperature to determine diaphragm based on the temperature and light transmittance.It is provided by the present invention
Detection method detection process is very simple.
As the 4th embodiment of the invention, as shown in figure 4, the lithium ion battery provided for fourth embodiment of the invention
The detection method flow chart of diaphragm closed pore temperature.The method is applied to lithium ion battery separator closed pore temperature recited above
Detection device, and diaphragm to be detected is fixed on the sample placement location in the temperature-controlled box, which comprises
Step S101: light source issues detection light and exposes to condenser；
Step S102: the light is aggregated into collimated light beam and exposed on the diaphragm to be detected by the condenser；
Step S103: the intracorporal temperature of temperature-controlled box control cabinet, so that the diaphragm persistently overheating to be detected；
Step S104: detector will transmit through the diaphragm to be detected and reach institute in the diaphragm temperature-rise period to be detected
The optical signal for stating the light beam of detector is converted into electric signal, and establishes the mapping relations of temperature and light transmittance, so as to based on described
Temperature and the mapping relations of light transmittance determine the closed pore temperature of the diaphragm to be detected.
Step S105: the detector draws temperature and light transmittance curve based on the temperature and the mapping relations of light transmittance
Figure, and the Magnification of light transmittance in the temperature and light transmittance curve figure is less than temperature corresponding to the initial point of default value
Value is determined as the closed pore temperature of the diaphragm to be detected.Wherein, before temperature and light transmittance curve figure are not heated up with diaphragm generally
Temperature be initial temperature value, the light transmittance before not heated up using diaphragm is initial light transmission value.
In step s105, the light transmittance that the light transmittance that the Magnification of light transmittance generally refers to B temperature subtracts A temperature is final
Obtained difference, if the Magnification is greater than the preset value of Magnification, shows not reaching the diaphragm also in diaphragm temperature-rise period
Closed pore temperature；If the Magnification is less than the preset value of Magnification, shows that diaphragm is mutated, arrived closing for the diaphragm
Therefore the Magnification of light transmittance in temperature and light transmittance curve figure is less than corresponding to the initial point of default value by hole temperature
Temperature value is determined as the closed pore temperature of the diaphragm to be detected.
Step S106: for the detector by the temperature and light transmittance curve figure, light transmittance increases to maximum value suddenly
Initial point corresponding to temperature value be determined as the broken film temperature of the diaphragm to be detected.In emulation experiment, when diaphragm reaches
After closed pore temperature, temperature continues to increase, and sample ruptures, at this point, source of parallel light directly can all penetrate diaphragm, light transmission moment
Rate moment increases to maximum value, which is diaphragm broken film temperature decision-point, i.e., light transmittance increases to the first of maximum value suddenly
Temperature value corresponding to initial point is determined as the broken film temperature of the diaphragm to be detected.
Wherein, the detection light that institute's light source issues is composite visible light line.
In addition, the detector is connect with display, and by the temperature and light transmittance curve figure or closed pore temperature, or it is broken
Film temperature or closed pore temperature and broken film temperature or temperature and light transmittance curve figure and closed pore temperature or temperature and light transmittance curve
Figure and broken film temperature or temperature and light transmittance curve figure, closed pore temperature and broken film temperature are transmitted to display and show.
In conclusion the detection method of lithium ion battery separator closed pore temperature provided by the present invention, not only can detecte
The closed pore temperature of diaphragm, additionally it is possible to the further broken film temperature of detection diaphragm.And the detection method is compared with prior art, detection
Process is simple.
The foregoing is merely illustrative of the preferred embodiments of the present invention, all in spirit of the invention not to limit invention
With any modifications, equivalent replacements, and improvements made within principle etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of detection device of lithium ion battery separator closed pore temperature, which is characterized in that described device includes: light source, optically focused
Mirror, temperature-controlled box and detector；
Diaphragm to be detected is fixed on the sample placement location in the temperature-controlled box；
The light source exposes to the condenser for issuing detection light；
The condenser exposes to the diaphragm to be detected for the light to be aggregated into collimated light beam；
The temperature-controlled box is used for the intracorporal temperature of control cabinet, so that the diaphragm persistently overheating to be detected；
The detector reaches the inspection in the diaphragm temperature-rise period to be detected, will transmit through the diaphragm to be detected
The optical signal for surveying the light beam of device is converted into electric signal, and establishes the mapping relations of temperature and light transmittance, to be based on the temperature
The closed pore temperature of the diaphragm to be detected is determined with the mapping relations of light transmittance.
2. detection device as described in claim 1, which is characterized in that the detector is also used to based on the temperature and light transmission
The mapping relations of rate draw temperature and light transmittance curve figure, and by the Magnification of light transmittance in the temperature and light transmittance curve figure
Temperature value corresponding to initial point less than default value is determined as the closed pore temperature of the diaphragm to be detected.
3. detection device as claimed in claim 2, which is characterized in that the detector is also used to the temperature and light transmittance
In curve graph, light transmittance increases to temperature value corresponding to the initial point of maximum value suddenly and is determined as the broken of the diaphragm to be detected
Film temperature.
4. detection device as described in claim 1, which is characterized in that the detection light that the light source issues is composite visible light
Line.
5. detection device as claimed in claim 1 or 3, which is characterized in that the detector is connect with display, and being used for will be warm
Degree and light transmittance curve figure or closed pore temperature or broken film temperature or closed pore temperature and broken film temperature or temperature and light transmittance are bent
Line chart and closed pore temperature or temperature and light transmittance curve figure and broken film temperature or temperature and light transmittance curve figure, closed pore temperature and
Broken film temperature is transmitted to the display and shows.
6. a kind of detection method of lithium ion battery separator closed pore temperature, which is characterized in that the method is applied to claim 1
To the detection device of lithium ion battery separator closed pore temperature described in 5 any one, and diaphragm to be detected is fixed on the temperature control
Sample placement location in case, which comprises
Light source issues detection light and exposes to condenser；
The light is aggregated into collimated light beam and exposed on the diaphragm to be detected by the condenser；
The intracorporal temperature of temperature-controlled box control cabinet, so that the diaphragm persistently overheating to be detected；
Detector will transmit through the light beam that the diaphragm to be detected reaches the detector in the diaphragm temperature-rise period to be detected
Optical signal be converted into electric signal, and the mapping relations of temperature and light transmittance are established, so as to based on the temperature and light transmittance
Mapping relations determine the closed pore temperature of the diaphragm to be detected.
7. detection method as claimed in claim 6, which is characterized in that the method also includes:
The detector draws temperature and light transmittance curve figure based on the temperature and the mapping relations of light transmittance, and by the temperature
Degree is determined as described with temperature value corresponding to initial point of the Magnification of light transmittance in light transmittance curve figure less than default value
The closed pore temperature of diaphragm to be detected.
8. detection method as claimed in claim 7, which is characterized in that the method also includes:
By in the temperature and light transmittance curve figure, light transmittance increases to corresponding to the initial point of maximum value the detector suddenly
Temperature value be determined as the broken film temperature of the diaphragm to be detected.
9. detection method as claimed in claim 6, which is characterized in that the detection light that the light source issues is composite visible light
Line.
10. the detection method as described in claim 6 or 8, which is characterized in that the detector is connect with display, by temperature
With light transmittance curve figure or closed pore temperature or broken film temperature or closed pore temperature and broken film temperature or temperature and light transmittance curve
Figure and closed pore temperature or temperature and light transmittance curve figure and broken film temperature or temperature and light transmittance curve figure, closed pore temperature and broken
Film temperature is transmitted to the display and shows.
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| CN112147026B (en) * | 2019-06-26 | 2022-03-11 | 河北金力新能源科技股份有限公司 | Testing method and testing device for complete closed pore temperature of diaphragm |
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