CN107367697A - A kind of double detector lithium battery surface temperature detector and method - Google Patents
A kind of double detector lithium battery surface temperature detector and method Download PDFInfo
- Publication number
- CN107367697A CN107367697A CN201710738035.9A CN201710738035A CN107367697A CN 107367697 A CN107367697 A CN 107367697A CN 201710738035 A CN201710738035 A CN 201710738035A CN 107367697 A CN107367697 A CN 107367697A
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- Prior art keywords
- temperature
- lithium battery
- mlx90614
- surface temperature
- battery surface
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 48
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 12
- 230000035772 mutation Effects 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims description 37
- 230000008859 change Effects 0.000 claims description 10
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims 1
- 230000001154 acute effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004441 surface measurement Methods 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a kind of double detector lithium battery surface temperature detector and method, ensure lithium battery temperature undergo mutation or acute variation in the case of, temperature survey can timely respond to take into account temperature detecting precision simultaneously, prevent under extreme condition using lithium battery so as to be caused damage to it.Detection means includes：PT1000 platinum resistance sensors, thermistor modular converter, MLX90614 infrared temperature sensors, SMBus buffer modules and MCU main control modules.With reference to thermal resistance detection temperature and infrared detection temperature, the optimal surface temperature of lithium battery is obtained at different conditions.By the above-mentioned means, the present invention can accurately and Quick Acquisition lithium battery surface temperature, so that the use of lithium battery is more safe and reliable.
Description
Technical field
The present invention relates to field of lithium, more particularly to a kind of double detector lithium battery surface temperature detector.
Background technology
Due to the demand of lithium battery itself chemical property, in order that its normal smoothly use is, it is necessary to ensure battery operation
Within the scope of proper temperature, otherwise service life of lithium battery and performance life will be adversely affected.The operating voltage of lithium battery,
All with the change of temperature significant change will occur for capacity, charge-discharge magnification, and prolonged high temperature or low temperature use, it will
Accelerate the decay of battery life.
In the prior art, generally battery temperature is monitored in real time, sets normal range of operation, once battery temperature
Within preset range, it will starting protection function (general to disconnect charge/discharge loop).
Thermal resistance detection mode mainly currently is used to battery temperature measurement, using thermistor as temperature sensor, led to
Undue platen press is sampled by ADC obtains thermistor terminal voltage, so as to calculate magnitude of voltage, then the resistance-temperature for passing through thermistor
Degree property calculation goes out temperature value.
Thermistor temp detection can obtain higher temperature detecting precision, but its temperature detection needs battery and thermoelectricity
Resistance reaches thermal equilibrium state, and secondly temperature change causes thermal resistance change in resistance again, therefore the Thermistor Temperature Measurement response time is slow, has
Certain hysteresis quality.Therefore when abnormal conditions, which occur, for battery causes battery temperature that saltus step or acute variation occurs, thermal resistance temperature
Spending detection can not quick response.
The content of the invention
In view of above-mentioned prior art not foot point, it is an object of the invention to provide a kind of quick and precisely temperature survey of lithium battery
Device and method, during solving existing lithium battery temperature detection, when under battery temperature catastrophe, resistance and temperature detection can not
The problem of timely responding to.
To achieve these goals, the present invention provides a kind of double detector lithium battery surface temperature detector and method,
Quick and precisely to obtain battery temperature,
A kind of double detector lithium battery surface temperature detector, it is characterised in that including：
Platinum resistance thermometer sensor, PT1000 temperature sensors：For detecting lithium battery surface temperature.
Infrared temperature sensor MLX90614：For detecting lithium battery surface temperature.
Thermistor modular converter：It is connected with platinum resistance thermometer sensor, PT1000 temperature sensors, is currently hindered for obtaining PT1000
Value.
SMBus buffer modules：Be connected with infrared temperature sensor MLX90614, for extend SMBus communication distances with can
By property.
MCU main control modules：It is connected simultaneously with thermistor modular converter and SMBus buffer modules, for obtaining heat in real time
Resistance and infrared detection temperature；And integrate thermal resistance and obtain optimal lithium battery surface temperature with infrared detection temperature, finally change
MLX90614 internal emissions rate score to MLX90614 measurement temperatures so as to calibrate.
In a kind of above-mentioned double detector lithium battery surface temperature detector, thermistor modular converter is supervised using temperature
Survey device MAX31865 and build thermistor change-over circuit, be converted into for measuring PT1000 resistance values, and by PT1000 resistance values
Digital quantity.
In a kind of above-mentioned double detector lithium battery surface temperature detector, SMBus buffer modules use bus buffer
Device PCA9617 builds SMBus buffer modules, for level conversion, the I/O mouth driving forces of enhancing MCU main control modules.
A kind of double detector lithium battery surface temperature detection method, it is characterised in that
Step 1：Detection means initializes, and configures each module.
Step 2：PT1000 temperature acquisitions, PT1000 sensor detection temperature values are obtained, pass through equation
R (T)=R (0) [1+AT+BT2+C(T-100)T3]
T is temperature value (DEG C)
R (T) is the resistance at a temperature of T
R0Resistance when for T being 0 DEG C
A=3.90830*10-3
B=-5.77500*10-7
When -200 DEG C≤T≤0 DEG C, C=-4.18301*10-12；
When 0 DEG C≤T≤+ 850 DEG C, C=0.
Wherein,
Calculate PT1000 platinum resistance thermometer sensor, Current Temperatures T.
Step 3：MLX90614 temperature acquisitions, obtain MLX90614 sensor detection temperature values.
Step 4：Judge whether PT1000 measured values are steady, entered according to current PT1000 measured temperatures with previous sampled value
Row contrast judges.
Step 5：MLX90614 emissivity is calibrated, according to PT1000 measured temperatures and MLX90614 measured temperatures pair
Object under test emissivity is calibrated in MLX90164.
Step 6：PT1000 detection temperature values are exported, PT1000 measurement temperatures are considered as lithium battery surface temperature.
Step 7：Judge whether MLX90614 measured values undergo mutation, according to current MLX90614 measured temperatures and previously
Sampled value carries out contrast judgement.
Step 8：MLX90614 detection temperature values are exported, MLX90614 measurement temperature values are considered as lithium battery surface temperature.
Step 9：PT1000 detection temperature values are exported, PT1000 measurement temperature values are considered as lithium battery surface temperature.
In a kind of above-mentioned double detector lithium battery surface temperature detection method,
Step 4 concrete operations are：Current PT1000 measurement temperatures and previous 6 PT1000 measurement temperatures are contrasted,
And performed according to comparing result：
Perform one：If PT1000 measurement temperature held stationaries, then it is assumed that lithium battery is in thermal balance with PT1000 sensors
State, using PT1000 measurement temperatures value as lithium battery surface temperature, while using PT1000 measurement temperatures value as standard, adjustment
Infrared temperature sensor MLX90614 emissivity so that MLX90614 detection temperatures value keeps one with PT1000 detection temperatures value
Cause, reach the purpose of infrared calibration.
Perform two：If PT1000 measurement temperatures are in increasing or decreasing state, determine whether, nearly 6 MLX90614
Whether measured temperature undergos mutation.
Perform three：If there occurs big ups and downs for nearly 6 MLX90614 measured temperatures, then it is assumed that lithium battery is dashed forward in temperature
In the case of change, then using MLX90614 measurement temperatures value as lithium battery surface temperature.
Perform four：If nearly 6 MLX90614 measured temperatures are also at the gradual change state of increasing or decreasing, then it is assumed that lithium electricity
Pond be in heating or temperature-fall period, then will PT1000 measurement temperatures value as lithium battery surface temperature.
The shortcomings that detecting low precision and slow platinum resistance thermometer sensor, temperature detection thermal response instant invention overcomes single infrared temperature, knot
Close the advantages of quick response of infrared temperature detection is with platinum resistance thermometer sensor, high precision test so that lithium battery temperature survey is more quick
Accurately, to ensure that lithium battery is safer reliable in use.
Brief description of the drawings：
Fig. 1 is double detector lithium battery surface temperature detects schematic diagram
Fig. 2 is to be based on MAX31865 thermistor modular converter schematic diagrames.
Fig. 3 is to be based on PCA9617SMBus bidirectional buffering module diagrams.
Fig. 4 is double detector lithium battery surface temperature detection method flow chart provided by the invention.
Embodiment
It is an object of the invention to provide a kind of lithium battery quick and precisely thermometry, it is ensured that lithium battery temperature occurs
In the case of mutation or acute variation, its temperature survey can timely respond to, while take into account temperature detecting precision, prevent in extreme bar
Battery last use causes damage to it under part.The present invention is made further specifically below in conjunction with accompanying drawing and specific embodiment
It is bright.The specific embodiment described herein that obtains is not intended to limit the present invention only to explain the present invention.
The present embodiment provides a kind of double detector lithium battery surface temperature detector, real for the present invention with reference to figure 1, Fig. 1
Apply a detection means block schematic illustration.As shown in figure 1, detection means includes：
PT1000 platinum resistance sensors 130, for detecting lithium battery surface temperature.
MLX90614 infrared temperature sensors 140, for detecting lithium battery surface temperature.
Thermistor modular converter 110, for obtaining the current resistance of PT1000 platinum resistance sensors.
SMBus buffer modules 120, for ensureing and extending SMBus communication capacities between main controller and MLX90614.
MCU main control modules 100, for gathering, handling, calibrating lithium battery surface measurement temperature.
The present embodiment also provides a kind of double detector lithium battery surface temperature detection method, and with reference to figure 4, Fig. 4 is the present invention
Embodiment double detector lithium battery surface temperature testing process schematic diagram.As shown in figure 4, this method includes：
S100：Detection means initializes, and configures each module.
S110：PT1000 temperature acquisitions, obtain PT1000 sensor detection temperature values.
S120：MLX90614 temperature acquisitions, obtain MLX90614 sensor detection temperature values.
S130：Judge whether PT1000 measured values are steady, entered according to current PT1000 measured temperatures with previous sampled value
Row contrast judges.
S140：MLX90614 emissivity is calibrated, according to PT1000 measured temperatures and MLX90614 measured temperatures pair
Object under test emissivity is calibrated in MLX90164.
S150：PT1000 detection temperature values are exported, PT1000 measurement temperatures are considered as lithium battery surface temperature.
S160：Judge whether MLX90614 measured values undergo mutation, according to current MLX90614 measured temperatures and previously
Sampled value carries out contrast judgement.
S170：MLX90614 detection temperature values are exported, MLX90614 measurement temperature values are considered as lithium battery surface temperature.
S180：PT1000 detection temperature values are exported, PT1000 measurement temperature values are considered as lithium battery surface temperature.
Specifically, thermistor change-over circuit is built using MAX31865, as shown in Fig. 2 MAX31865 thermal resistances are changed
Circuit 111 is used to measure PT1000 resistance values, and is translated into digital quantity.
To ensure temperature detecting precision, reduce the measurement error that connecting wire is brought, thermal resistance measurement is surveyed using four-wire system
Amount, wherein two lines are to by detecting electric current, two lines are to voltage detecting in addition.
MCU main control modules 100 obtain the PT1000 resistances after conversion by SPI communication mode.
SMBus buffer modules are built using PCA9617, as shown in figure 3, playing level conversion, enhancing MCU main control modules
The effect of 100 I/O mouth driving forces.
Specifically, carrying out initial configuration to detection means first, temperature sampling interval, traffic rate and each core are set
Piece mode of operation.
MCU main control modules 100 obtain current PT1000 resistances R (T) by MAX31865 thermal resistances change-over circuit 111
Pass through equation
R (T)=R (0) [1+AT+BT2+C(T-100)T3]
T is temperature value (DEG C)
R (T) is the resistance at a temperature of T
R0Resistance when for T being 0 DEG C
A=3.90830*10-3
B=-5.77500*10-7
When -200 DEG C≤T≤0 DEG C, C=-4.18301*10-12；
When 0 DEG C≤T≤+ 850 DEG C, C=0.
Calculate PT1000 platinum resistance thermometer sensor, Current Temperatures T.
MCU main control modules 100 obtain the measured temperature of infrared temperature sensor 140 by SMBus communication modes.
Current PT1000 measurement temperatures and previous 6 PT1000 measurement temperatures are contrasted.
If the 1st, PT1000 measurement temperatures held stationary, then it is assumed that lithium battery is in thermal equilibrium state with PT1000 sensors,
Using PT1000 measurement temperatures value as lithium battery surface temperature, at the same PT1000 measurement temperatures value is infrared as standard, adjustment
Temperature sensor MLX90614 emissivity so that MLX90614 detection temperatures value is consistent with PT1000 detection temperature values, is reached
To the purpose of infrared calibration.
If the 2, PT1000 measurement temperatures are in increasing or decreasing state, determine whether, nearly 6 MLX90614 temperature are surveyed
Whether value undergos mutation.
The 3rd, if there occurs big ups and downs for nearly 6 MLX90614 measured temperatures, then it is assumed that lithium battery is in temperature jump feelings
Under condition, then using MLX90614 measurement temperatures value as lithium battery surface temperature.
The 4th, if nearly 6 MLX90614 measured temperatures are also at the gradual change state of increasing or decreasing, then it is assumed that at lithium battery
In heating or temperature-fall period, then will PT1000 measurement temperatures value as lithium battery surface temperature.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (5)
- A kind of 1. double detector lithium battery surface temperature detector, it is characterised in that including：Platinum resistance thermometer sensor, PT1000 temperature sensors：For detecting lithium battery surface temperature；Infrared temperature sensor MLX90614：For detecting lithium battery surface temperature；Thermistor modular converter：It is connected with platinum resistance thermometer sensor, PT1000 temperature sensors, for obtaining the current resistances of PT1000；SMBus buffer modules：It is connected with infrared temperature sensor MLX90614, for extending SMBus communication distances and reliability；MCU main control modules：It is connected simultaneously with thermistor modular converter and SMBus buffer modules, for obtaining thermal resistance in real time With infrared detection temperature；And integrate thermal resistance and obtain optimal lithium battery surface temperature with infrared detection temperature, finally change MLX90614 internal emissions rate score to MLX90614 measurement temperatures so as to calibrate.
- A kind of 2. double detector lithium battery surface temperature detector according to claim 1, it is characterised in that temperature-sensitive electricity Resistance modular converter builds thermistor change-over circuit using temperature monitoring MAX31865, for measuring PT1000 resistance values, and PT1000 resistance values are converted into digital quantity.
- A kind of 3. double detector lithium battery surface temperature detector according to claim 1, it is characterised in that SMBus Buffer module builds SMBus buffer modules using bus buffer PCA9617, for level conversion, strengthens MCU main control modules I/O mouth driving forces.
- A kind of 4. double detector lithium battery surface temperature detection method, it is characterised in thatStep 1：Detection means initializes, and configures each module；Step 2：PT1000 temperature acquisitions, PT1000 sensor detection temperature values are obtained, pass through equation R (T)=R (0) [1+AT+ BT2+C(T-100)T3]T is temperature value (DEG C)R (T) is the resistance at a temperature of TR0Resistance when for T being 0 DEG CA=3.90830*10-3B=-5.77500*10-7When -200 DEG C≤T≤0 DEG C, C=-4.18301*10-12；Wherein, when 0 DEG C≤T≤+ 850 DEG C, C=0Calculate PT1000 platinum resistance thermometer sensor, Current Temperatures T；Step 3：MLX90614 temperature acquisitions, obtain MLX90614 sensor detection temperature values；Step 4：Judge whether PT1000 measured values are steady, carried out pair according to current PT1000 measured temperatures and previous sampled value Than judging；Step 5：MLX90614 emissivity is calibrated, according to PT1000 measured temperatures and MLX90614 measured temperatures pair Object under test emissivity is calibrated in MLX90164；Step 6：PT1000 detection temperature values are exported, PT1000 measurement temperatures are considered as lithium battery surface temperature；Step 7：Judge whether MLX90614 measured values undergo mutation, according to current MLX90614 measured temperatures and prior sample Value carries out contrast judgement；Step 8：MLX90614 detection temperature values are exported, MLX90614 measurement temperature values are considered as lithium battery surface temperature；Step 9：PT1000 detection temperature values are exported, PT1000 measurement temperature values are considered as lithium battery surface temperature.
- A kind of 5. double detector lithium battery surface temperature detection method according to claim 4, it is characterised in thatStep 4 concrete operations are：Current PT1000 measurement temperatures and previous 6 PT1000 measurement temperatures are contrasted, and root Performed according to comparing result：Perform one：If PT1000 measurement temperature held stationaries, then it is assumed that lithium battery is in thermal equilibrium state with PT1000 sensors, Using PT1000 measurement temperatures value as lithium battery surface temperature, at the same PT1000 measurement temperatures value is infrared as standard, adjustment Temperature sensor MLX90614 emissivity so that MLX90614 detection temperatures value is consistent with PT1000 detection temperature values, is reached To the purpose of infrared calibration；Perform two：If PT1000 measurement temperatures are in increasing or decreasing state, determine whether, nearly 6 MLX90614 temperature Whether measured value undergos mutation；Perform three：If there occurs big ups and downs for nearly 6 MLX90614 measured temperatures, then it is assumed that lithium battery is in temperature jump feelings Under condition, then using MLX90614 measurement temperatures value as lithium battery surface temperature；Perform four：If nearly 6 MLX90614 measured temperatures are also at the gradual change state of increasing or decreasing, then it is assumed that at lithium battery In heating or temperature-fall period, then will PT1000 measurement temperatures value as lithium battery surface temperature.
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| CN111272295A (en) * | 2020-03-02 | 2020-06-12 | 浙江杭可科技股份有限公司 | Non-contact infrared temperature measurement system and test method based on square battery |
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| Publication number | Publication date |
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| CN107367697B (en) | 2020-09-01 |
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