CN107367697B - Double-detector lithium battery surface temperature detection device and method - Google Patents
Double-detector lithium battery surface temperature detection device and method Download PDFInfo
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- CN107367697B CN107367697B CN201710738035.9A CN201710738035A CN107367697B CN 107367697 B CN107367697 B CN 107367697B CN 201710738035 A CN201710738035 A CN 201710738035A CN 107367697 B CN107367697 B CN 107367697B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 73
- 238000001514 detection method Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 22
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 12
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 12
- 230000003247 decreasing effect Effects 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 230000035772 mutation Effects 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000004044 response Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004441 surface measurement Methods 0.000 description 1
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- 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
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- 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
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- 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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a double-detector lithium battery surface temperature detection device and method, which can ensure that temperature measurement can respond in time and simultaneously give consideration to temperature detection precision under the condition that the temperature of a lithium battery is suddenly or violently changed, and prevent the lithium battery from being used under extreme conditions to cause damage to the lithium battery. The detection device comprises: PT1000 platinum thermal resistance temperature sensor, thermistor conversion module, MLX90614 infrared temperature sensor, SMBus buffer module and MCU main control module. And combining the detection temperature of the thermal resistor and the infrared detection temperature to obtain the optimal surface temperature of the lithium battery under different conditions. Through the mode, the surface temperature of the lithium battery can be accurately and quickly acquired, so that the lithium battery is safer and more reliable to use.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a double-detector lithium battery surface temperature detection device.
Background
Due to the chemical requirements of lithium batteries, in order to use the batteries normally and smoothly, the batteries need to be guaranteed to operate within a proper temperature range, otherwise the service life and the performance life of the lithium batteries are adversely affected. The working voltage, capacity and charge-discharge rate of the lithium battery can be changed remarkably along with the change of temperature, and the service life of the lithium battery can be shortened when the lithium battery is used at high temperature or low temperature for a long time.
In the prior art, the battery temperature is usually monitored in real time, a normal operating range is set, and once the battery temperature is out of a preset range, a protection function (generally, a charging/discharging loop is disconnected) is started.
At present, a thermal resistance detection mode is mainly adopted for measuring the temperature of the battery, a thermistor is used as a temperature sensor, the voltage of the thermistor is obtained by ADC sampling through a voltage division method, so that a voltage value is calculated, and then a temperature value is calculated through the resistance value-temperature characteristic of the thermistor.
The thermistor temperature detection can obtain higher temperature detection precision, but the temperature detection needs the battery and the thermal resistor to reach a thermal balance state, and then the temperature change leads to the resistance value change of the thermal resistor, so the temperature measurement response time of the thermal resistor is slow, and certain hysteresis exists. Therefore, when the battery is abnormal and the battery temperature jumps or changes dramatically, the temperature detection of the thermal resistor cannot respond quickly.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, an object of the present invention is to provide a device and a method for quickly and accurately measuring temperature of a lithium battery, so as to solve the problem that temperature detection of a thermal resistor cannot respond in time when the temperature of the battery suddenly changes during temperature detection of the lithium battery.
In order to achieve the above objects, the present invention provides a dual-detector lithium battery surface temperature detection apparatus and method to rapidly and accurately obtain the battery temperature,
the utility model provides a two detector lithium cell surface temperature detection device which characterized in that includes:
platinum thermistor PT1000 temperature sensor: the method is used for detecting the surface temperature of the lithium battery.
Infrared temperature sensor MLX 90614: the method is used for detecting the surface temperature of the lithium battery.
Thermistor conversion module: and the resistance value acquisition module is connected with a platinum thermal resistor PT1000 temperature sensor and is used for acquiring the current resistance value of the PT 1000.
SMBus buffer module: and the system is connected with an infrared temperature sensor MLX90614 and is used for prolonging the SMBus communication distance and reliability.
MCU host system: meanwhile, the thermal resistor and the SMBus buffer module are connected and used for acquiring the thermal resistor and the infrared detection temperature in real time; and integrating the thermal resistance and the infrared detection temperature to obtain the optimal surface temperature of the lithium battery, and finally changing the internal emissivity value of the MLX90614 so as to calibrate the measured temperature of the MLX 90614.
In the above device for detecting the surface temperature of the lithium battery with the double detectors, the thermistor conversion module adopts the temperature monitor MAX31865 to build a thermistor conversion circuit for measuring the PT1000 resistance value and converting the PT1000 resistance value into a digital value.
In foretell two detector lithium battery surface temperature detection device, SMBus buffer module adopts bus buffer PCA9617 to build SMBus buffer module for level conversion, reinforcing MCU host control module's IO mouth driving force.
A method for detecting the surface temperature of a lithium battery with double detectors is characterized in that,
step 1: the detection device is initialized and each module is configured.
Step 2: PT1000 temperature acquisition, acquiring the detection temperature value of the PT1000 sensor, and obtaining the temperature value through an equation
R(T)＝R(0)[1+AT+BT2+C(T-100)T3]
T is a temperature value (. degree. C.)
R (T) is the resistance value at the temperature of T
R0Is a resistance value at T of 0 DEG C
A＝3.90830*10-3
B＝-5.77500*10-7
When T is more than or equal to-200 ℃ and less than or equal to 0 ℃, C is-4.18301 x 10-12；
When the temperature is more than or equal to 0 ℃ and less than or equal to T and less than or equal to 850 ℃, C is equal to 0.
Wherein the content of the first and second substances,
and calculating the current temperature T of the PT1000 platinum thermal resistor.
And step 3: and acquiring the MLX90614 temperature, and acquiring the detection temperature value of the MLX90614 sensor.
And 4, step 4: and judging whether the PT1000 measured value is stable or not, and comparing and judging according to the current PT1000 temperature measured value and a previous sampling value.
And 5: and (4) calibrating the MLX90614 emissivity, namely calibrating the emissivity of the object to be measured in the MLX90164 according to the PT1000 temperature measurement value and the MLX90614 temperature measurement value.
Step 6: outputting a PT1000 detection temperature value, and regarding the PT1000 measurement temperature as the surface temperature of the lithium battery.
And 7: and judging whether the MLX90614 measured value is mutated or not, and comparing and judging the MLX90614 measured value with a previous sampling value according to the current MLX90614 temperature measured value.
And 8: and outputting the detected temperature value of the MLX90614, and taking the temperature value measured by the MLX90614 as the surface temperature of the lithium battery.
And step 9: outputting a PT1000 detection temperature value, and regarding the PT1000 detection temperature value as the surface temperature of the lithium battery.
In the above method for detecting the surface temperature of the lithium battery with the double detectors,
the step 4 is specifically operated as follows: comparing the current PT1000 measured temperature with the previous PT1000 measured temperature for 6 times, and executing according to the comparison result:
executing one step: if the temperature measured by the PT1000 is kept stable, the lithium battery and the PT1000 sensor are considered to be in a thermal balance state, the temperature value measured by the PT1000 is used as the surface temperature of the lithium battery, meanwhile, the temperature value measured by the PT1000 is used as a standard, and the emissivity of the infrared temperature sensor MLX90614 is adjusted, so that the temperature value detected by the MLX90614 is consistent with the temperature value detected by the PT1000, and the purpose of infrared calibration is achieved.
Executing a second step: if the PT1000 measured temperature is in an increasing or decreasing state, further judging whether the MLX90614 temperature measured values of the last 6 times are mutated or not.
And (3) executing the following three steps: if the temperature measured value of the MLX90614 fluctuates sharply for nearly 6 times, the lithium battery is considered to be in the condition of temperature mutation, and the temperature value measured by the MLX90614 is used as the surface temperature of the lithium battery.
And executing four steps: if the MLX90614 temperature measurement values of nearly 6 times are also in an increasing or decreasing gradual change state, the lithium battery is considered to be in a temperature increasing or decreasing process, and the PT1000 measured temperature value is still used as the surface temperature of the lithium battery.
The invention overcomes the defects of low precision of single infrared temperature detection and slow thermal response of platinum thermal resistor temperature detection, and combines the advantages of quick response of infrared temperature detection and high precision detection of platinum thermal resistor, so that the temperature measurement of the lithium battery is faster and more accurate, and the lithium battery is safer and more reliable in the using process.
Description of the drawings:
FIG. 1 is a schematic diagram of the detection of the surface temperature of a lithium battery with a double detector.
Fig. 2 is a schematic diagram of a MAX31865 thermistor based conversion module.
Fig. 3 is a schematic diagram of a PCA 9617-based SMBus bi-directional buffering module.
FIG. 4 is a flow chart of a method for detecting the surface temperature of a lithium battery with two detectors according to the present invention.
Detailed Description
The invention aims to provide a method for quickly and accurately measuring the temperature of a lithium battery, which can ensure that the temperature measurement can be timely responded when the temperature of the lithium battery is suddenly or violently changed, and meanwhile, the temperature detection precision is considered, so that the damage to the lithium battery caused by the continuous use of the battery under extreme conditions is prevented. The invention is described in further detail below with reference to specific embodiments and with reference to the following drawings. The specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
The embodiment provides a double-detector lithium battery surface temperature detection device, and referring to fig. 1, fig. 1 is a schematic diagram of a detection device frame according to an embodiment of the invention. As shown in fig. 1, the detection apparatus includes:
and the PT1000 platinum thermal resistance temperature sensor 130 is used for detecting the surface temperature of the lithium battery.
And the MLX90614 infrared temperature sensor 140 is used for detecting the surface temperature of the lithium battery.
And the thermistor conversion module 110 is used for acquiring the current resistance value of the PT1000 platinum thermistor temperature sensor.
And the SMBus buffer module 120 is used for guaranteeing the SMBus communication capacity between the expansion master controller and the MLX 90614.
And the MCU main control module 100 is used for collecting, processing and calibrating the surface measurement temperature of the lithium battery.
The embodiment also provides a method for detecting the surface temperature of the lithium battery with the double detectors, and referring to fig. 4, fig. 4 is a schematic diagram of a flow of detecting the surface temperature of the lithium battery with the double detectors in the embodiment of the present invention. As shown in fig. 4, the method includes:
s100: the detection device is initialized and each module is configured.
S110: and acquiring the PT1000 temperature, and acquiring the detection temperature value of the PT1000 sensor.
S120: and acquiring the MLX90614 temperature, and acquiring the detection temperature value of the MLX90614 sensor.
S130: and judging whether the PT1000 measured value is stable or not, and comparing and judging according to the current PT1000 temperature measured value and a previous sampling value.
S140: and (4) calibrating the MLX90614 emissivity, namely calibrating the emissivity of the object to be measured in the MLX90164 according to the PT1000 temperature measurement value and the MLX90614 temperature measurement value.
S150: outputting a PT1000 detection temperature value, and regarding the PT1000 measurement temperature as the surface temperature of the lithium battery.
S160: and judging whether the MLX90614 measured value is mutated or not, and comparing and judging the MLX90614 measured value with a previous sampling value according to the current MLX90614 temperature measured value.
S170: and outputting the detected temperature value of the MLX90614, and taking the temperature value measured by the MLX90614 as the surface temperature of the lithium battery.
S180: outputting a PT1000 detection temperature value, and regarding the PT1000 detection temperature value as the surface temperature of the lithium battery.
Specifically, a thermistor conversion circuit is built by adopting MAX31865, and as shown in fig. 2, the MAX31865 thermal resistance conversion circuit 111 is used for measuring the resistance value of the PT1000 and converting the resistance value into a digital value.
In order to ensure the temperature detection precision and reduce the measurement error caused by connecting wires, the thermal resistance measurement adopts a four-wire system measurement, wherein two wires are used for passing detection current, and the other two wires are used for voltage detection.
The MCU main control module 100 obtains the converted PT1000 resistance value through the SPI communication mode.
The PCA9617 is adopted to build an SMBus buffer module, as shown in FIG. 3, which plays a role in level conversion and enhancing the I/O port driving capability of the MCU master control module 100.
Specifically, the detection device is initially configured, and a temperature sampling interval, a communication rate, and a working mode of each chip are set.
The MCU main control module 100 obtains the current PT1000 resistance value R (T) through the MAX31865 thermal resistance conversion circuit 111
By equation
R(T)＝R(0)[1+AT+BT2+C(T-100)T3]
T is a temperature value (. degree. C.)
R (T) is the resistance value at the temperature of T
R0Is a resistance value at T of 0 DEG C
A＝3.90830*10-3
B＝-5.77500*10-7
When T is more than or equal to-200 ℃ and less than or equal to 0 ℃, C is-4.18301 x 10-12；
When the temperature is more than or equal to 0 ℃ and less than or equal to T and less than or equal to 850 ℃, C is equal to 0.
And calculating the current temperature T of the PT1000 platinum thermal resistor.
The MCU main control module 100 acquires the temperature measurement value of the infrared temperature sensor 140 through an SMBus communication mode.
The current PT1000 measured temperature is compared with the previous 6 PT1000 measured temperatures.
1. If the temperature measured by the PT1000 is kept stable, the lithium battery and the PT1000 sensor are considered to be in a thermal balance state, the temperature value measured by the PT1000 is used as the surface temperature of the lithium battery, meanwhile, the temperature value measured by the PT1000 is used as a standard, and the emissivity of the infrared temperature sensor MLX90614 is adjusted, so that the temperature value detected by the MLX90614 is consistent with the temperature value detected by the PT1000, and the purpose of infrared calibration is achieved.
2. If the PT1000 measured temperature is in an increasing or decreasing state, further judging whether the MLX90614 temperature measured values of the last 6 times are mutated or not.
3. If the temperature measured value of the MLX90614 fluctuates sharply for nearly 6 times, the lithium battery is considered to be in the condition of temperature mutation, and the temperature value measured by the MLX90614 is used as the surface temperature of the lithium battery.
4. If the MLX90614 temperature measurement values of nearly 6 times are also in an increasing or decreasing gradual change state, the lithium battery is considered to be in a temperature increasing or decreasing process, and the PT1000 measured temperature value is still used as the surface temperature of the lithium battery.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (5)
1. A method for detecting the surface temperature of a lithium battery with double detectors is characterized in that,
step 1: initializing a detection device and configuring each module;
step 2: PT1000 temperature acquisition, acquiring the detection temperature value of the PT1000 sensor, and obtaining the temperature value through an equation R (T) ═ R0[1+AT+BT2+C(T-100)T3]
T is a temperature value (. degree. C.)
R (T) is the resistance value at the temperature of T
R0Is a resistance value at T of 0 DEG C
A＝3.90830*10-3
B＝-5.77500*10-7
When T is more than or equal to-200 ℃ and less than or equal to 0 ℃, C is-4.18301 x 10-12；
Wherein, when T is more than or equal to 0 ℃ and less than or equal to +850 ℃, C is 0
Calculating the current temperature T of the PT1000 platinum thermal resistor;
and step 3: acquiring the temperature of the MLX90614 to obtain the detection temperature value of the MLX90614 sensor;
and 4, step 4: judging whether the PT1000 measured value is stable or not, and comparing and judging the current PT1000 temperature measured value with a previous sampling value;
step 401: if the PT1000 measured value is stable, calibrating the emissivity of the MLX90614, and calibrating the emissivity of the object to be measured in the MLX90164 according to the PT1000 temperature measured value and the MLX90614 temperature measured value;
step 402: outputting a PT1000 detection temperature value, and taking the PT1000 detection temperature as the surface temperature of the lithium battery;
step 411: if the PT1000 measured value is not stable, judging whether the MLX90614 measured value is mutated or not, and comparing and judging the current MLX90614 temperature measured value with a previous sampling value;
step 411A: if the MLX90614 measured value is mutated, outputting an MLX90614 detection temperature value, and regarding the MLX90614 measured temperature value as the surface temperature of the lithium battery;
step 411B: and if the MLX90614 measured value is not mutated, outputting a PT1000 detection temperature value, and regarding the PT1000 detection temperature value as the surface temperature of the lithium battery.
2. The method of claim 1, wherein the method comprises the steps of,
the step 4 is specifically operated as follows: comparing the current PT1000 measured temperature with the previous PT1000 measured temperature for 6 times, and executing according to the comparison result:
executing one step: if the temperature measured by the PT1000 is kept stable, the lithium battery and the PT1000 sensor are considered to be in a thermal balance state, the temperature value measured by the PT1000 is used as the surface temperature of the lithium battery, meanwhile, the temperature value measured by the PT1000 is used as a standard, and the emissivity of the infrared temperature sensor MLX90614 is adjusted, so that the temperature value detected by the MLX90614 is consistent with the temperature value detected by the PT1000, and the purpose of infrared calibration is achieved;
executing a second step: if the PT1000 measured temperature is in an increasing or decreasing state, further judging whether the MLX90614 temperature measured value of nearly 6 times is mutated;
and (3) executing the following three steps: if the temperature measured value of the MLX90614 fluctuates sharply for nearly 6 times, the lithium battery is considered to be in the condition of temperature mutation, and the temperature value measured by the MLX90614 is used as the surface temperature of the lithium battery;
and executing four steps: if the MLX90614 temperature measurement values of nearly 6 times are also in an increasing or decreasing gradual change state, the lithium battery is considered to be in a temperature increasing or decreasing process, and the PT1000 measured temperature value is still used as the surface temperature of the lithium battery.
3. A detecting device using the method for detecting the surface temperature of a lithium battery with two detectors as claimed in claim 1, comprising:
platinum thermistor PT1000 temperature sensor: the device is used for detecting the surface temperature of the lithium battery;
infrared temperature sensor MLX 90614: the device is used for detecting the surface temperature of the lithium battery;
thermistor conversion module: the resistance value acquisition module is connected with a platinum thermal resistor PT1000 temperature sensor and is used for acquiring the current resistance value of the PT 1000;
SMBus buffer module: the system is connected with an infrared temperature sensor MLX90614 and is used for prolonging the SMBus communication distance and reliability;
MCU host system: meanwhile, the thermal resistor and the SMBus buffer module are connected and used for acquiring the thermal resistor and the infrared detection temperature in real time; and integrating the thermal resistance and the infrared detection temperature to obtain the optimal surface temperature of the lithium battery, and finally changing the internal emissivity value of the MLX90614 so as to calibrate the measured temperature of the MLX 90614.
4. The apparatus as claimed in claim 3, wherein the thermistor switching module employs a temperature monitor MAX31865 to construct a thermistor switching circuit for measuring the PT1000 resistance value and converting the PT1000 resistance value into a digital value.
5. The device for detecting the surface temperature of the double-detector lithium battery as claimed in claim 3, wherein the SMBus buffer module adopts a bus buffer PCA9617 to build the SMBus buffer module, and is used for level conversion and enhancing the I/O port driving capability of the MCU main control module.
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| CN201465100U (en) * | 2009-06-11 | 2010-05-12 | 英业达科技有限公司 | Bidirectional buffering device |
| JP2011033358A (en) * | 2009-07-29 | 2011-02-17 | Mitsubishi Materials Corp | Temperature sensor |
| CN102478431B (en) * | 2010-11-22 | 2016-01-20 | 三菱综合材料株式会社 | Temperature sensor |
| CN103199845B (en) * | 2012-01-09 | 2017-03-15 | 上海华虹集成电路有限责任公司 | Bidirectional buffer based on open drain bus |
| CN203352203U (en) * | 2013-04-16 | 2013-12-18 | 深圳宝嘉能源有限公司 | Mobile power supply capable of detecting battery temperature |
| CN204497777U (en) * | 2015-03-02 | 2015-07-22 | 爱国者电子科技有限公司 | A kind of pre-alarm portable power source device |
| CN205038592U (en) * | 2015-10-19 | 2016-02-17 | 浪潮集团有限公司 | Electric system is economized to PCIE equipment based on SMBUS bus agreement |
| CN105651398A (en) * | 2016-01-11 | 2016-06-08 | 中国矿业大学 | Infrared temperature measurement-based wall bushing fault monitoring device |
| CN105894713B (en) * | 2016-05-05 | 2017-11-07 | 中南林业科技大学 | A kind of method for safety monitoring detected based on non-contact temperature |
| CN105758529B (en) * | 2016-05-05 | 2019-02-22 | 中南林业科技大学 | A kind of safety monitoring device based on non-contact temperature detection |
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