CN118549001A - Power battery temperature detection system and detection method - Google Patents
Power battery temperature detection system and detection method Download PDFInfo
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- CN118549001A CN118549001A CN202410647462.6A CN202410647462A CN118549001A CN 118549001 A CN118549001 A CN 118549001A CN 202410647462 A CN202410647462 A CN 202410647462A CN 118549001 A CN118549001 A CN 118549001A
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- 238000001514 detection method Methods 0.000 title claims abstract description 51
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- 238000005259 measurement Methods 0.000 claims description 12
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Abstract
The invention relates to the technical field of battery detection, in particular to a power battery temperature detection system and a detection method. Including first detection path and second detection path, first detection path includes: s11: acquiring the voltage of each resistor of the multipath resistors of the battery to be tested; s12: amplifying the voltage through a differential amplifying circuit, and checking the mapping relation between the voltage and the temperature of the resistor to obtain the hot end temperature of the battery to be tested; s13: acquiring the cold end temperature of the board, and acquiring the temperature drift coefficient of the board through the cold end temperature and the temperature drift coefficient curve; s14: and correcting the hot end temperature and the on-board temperature drift coefficient through a temperature correction unit to obtain a corrected temperature. The temperature that this scheme can make the detection is more accurate.
Description
Technical Field
The invention relates to the technical field of battery detection, in particular to a power battery temperature detection system and a detection method.
Background
The power battery is an important part of a new energy automobile, the performance and the safety of the power battery are directly related to the safety of the whole automobile, and the lithium material is an important material of the power battery. Due to the flammable nature of lithium batteries, temperature has been seen as a key performance parameter for lithium batteries, the variation of which is closely related to safety performance. In the performance indexes such as external short circuit, charge, discharge, overcharge and the like, the battery has a temperature detection regulation. The performance and the safety of the power battery can be judged by detecting and analyzing the temperature change trend of the battery under different scenes.
In the prior art, the problem of low temperature measurement precision exists in the temperature detection of the power battery, and researches show that the number of measurement channels of a temperature detection system of the power battery is too small, and the actual temperature of different planes of the power battery is different at the same time; in the prior art, the unreasonable selection of the cold end reference point often exists in the power battery temperature detection system, so that the temperature obtained by the cold end reference point cannot truly reflect the electromotive force difference between the hot end and the cold end, and the phenomenon that the measured temperature has larger deviation from the actual temperature is caused.
Based on the foregoing, there is a need for a method and system that can accurately detect the temperature of a power battery.
Disclosure of Invention
Aiming at the problem that the current power battery temperature detection has larger deviation from the actual detected temperature, the invention provides a power battery temperature detection method and a power battery temperature detection system to solve the problem.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
The embodiment of the application discloses a power battery temperature detection method, which comprises a first detection path and a second detection path, wherein the first detection path comprises the following steps:
S11: acquiring the voltage of each resistor of the multipath resistors of the battery to be tested;
S12: amplifying the voltage through a differential amplifying circuit, and checking the mapping relation between the voltage and the temperature of the resistor to obtain the hot end temperature of the battery to be tested;
s13: acquiring the cold end temperature of the board, and acquiring the temperature drift coefficient of the board through the cold end temperature and the temperature drift coefficient curve;
S14: and correcting the hot end temperature and the on-board temperature drift coefficient through a temperature correction unit (6) to obtain a corrected temperature.
The technical scheme is adopted: according to the scheme, the temperature drift coefficient of the board is obtained through the cold end temperature and temperature drift coefficient curve, and the hot end temperature and the board temperature drift coefficient are combined to obtain the correction temperature, so that the accuracy of temperature measurement is improved.
Further preferably, the step S13 includes:
s131: obtaining a mapping curve of cold end temperature and temperature drift coefficient;
S132: obtaining a board-carried temperature drift coefficient through checking a mapping curve by a cold end temperature value;
the mapping curve is related to the cold end material.
The technical scheme is adopted: and obtaining an on-board temperature drift coefficient corresponding to the cold end temperature according to the mapping curve of the cold end temperature and the temperature drift coefficient, so that the calculated hot end temperature is more accurate.
Further preferably, the second detection path includes:
S21: collecting the measurement potential difference of the hot end through a multi-path temperature collecting unit (1);
s22: converting the collected measurement potential difference of the hot end into the temperature difference of the battery to be measured through filtering partial pressure and differential amplification;
S23: converting the cold end voltage measured on board into cold end temperature;
S24: and adding the temperature difference of the battery to be measured and the cold end temperature to obtain the corrected temperature.
The technical scheme is adopted: in the scheme, the actual temperature of the final battery can be calculated through the combination of the cold end temperature and the hot end temperature measurement, the error of the measured temperature and the actual temperature can be reduced, and the accuracy of the measured temperature is improved.
Further preferably, the method further comprises: and S25, correcting the final temperature by the temperature correction module to obtain a corrected temperature.
Further preferably, the multi-path temperature acquisition unit comprises a plurality of temperature sensor modules, and the temperature sensor modules are uniformly arranged on each measuring point according to the area of the battery to be measured.
The technical scheme is adopted: according to the scheme, the temperature sensor modules are uniformly distributed on each measurement point of the battery, so that the error of final measurement can be reduced.
Further preferably, the cold end voltage is a voltage value measured on board away from the object to be measured.
The technical scheme is adopted: according to the scheme, the on-board voltage far away from the object to be measured can be measured, the on-board voltage is converted into the cold end temperature, and the cold end temperature and the hot end temperature difference are combined to finally obtain the correction temperature.
Further preferably, a power battery temperature detection system, applied to the temperature detection method as described above, is characterized by comprising: the temperature compensation device comprises a multipath temperature acquisition unit, a voltage temperature conversion unit, a cold end temperature compensation unit, a temperature drift unit and a temperature correction unit, wherein the multipath temperature acquisition unit is electrically connected with the voltage temperature conversion unit, the cold end temperature compensation unit is electrically connected with the temperature drift unit, and the temperature correction unit is electrically connected with the temperature drift unit and the voltage temperature conversion unit.
Further preferably, the multi-path temperature acquisition unit comprises a plurality of temperature sensor modules or a plurality of thermal resistors, a filtering voltage division module and a differential amplification module.
Further preferably, the temperature drift unit is a temperature drift coefficient curve corresponding to different cold end temperatures according to device characteristics, and the corresponding temperature drift coefficients are searched through the cold end temperatures.
Further preferably, the formula set in the temperature correction module is:
；
wherein, In order to correct the temperature of the liquid,Is the coefficient of temperature drift and the temperature drift,Is the hot end temperature.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a first detection path temperature detection method according to the present application;
FIG. 2 is a flow chart of a second detection path temperature detection method according to the present application;
FIG. 3 is a flow chart of step S13 of FIG. 1 according to the present application;
FIG. 4 is a circuit connection block diagram of the temperature detection system of the present application.
In the figure:
1. A multi-path temperature acquisition unit; 2. a temperature sensor module; 3. a filtering voltage dividing module; 4. a differential amplification module; 5. a cold end temperature compensation unit; 6. a temperature correction unit; 7. a voltage-temperature conversion unit; 8. and a temperature drift unit.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Referring to fig. 1 to fig. 4, like the original power battery temperature detection device, there is often an unreasonable situation of selecting a cold end reference point in the power battery temperature detection system, so that the temperature obtained by the cold end reference point cannot truly reflect the electric potential difference between the hot end and the cold end, and thus a phenomenon that there is a large deviation between the measured temperature and the actual temperature is caused.
S11: acquiring the voltage of each resistor of the multipath resistors of the battery to be tested;
S12: amplifying the voltage through a differential amplifying circuit, and checking the mapping relation between the voltage and the temperature of the resistor to obtain the hot end temperature of the battery to be tested;
s13: acquiring the cold end temperature of the board, and acquiring the temperature drift coefficient of the board through the cold end temperature and the temperature drift coefficient curve;
s14: and the hot end temperature and the on-board temperature drift coefficient are subjected to temperature correction by a temperature correction unit 6 to obtain a corrected temperature.
According to the scheme, the temperature drift coefficient of the board is obtained through the cold end temperature and the temperature drift coefficient curve, and the hot end temperature and the temperature drift coefficient of the board are combined to obtain the corrected temperature, so that the accuracy of temperature measurement is improved;
the invention also provides a method for carrying out multichannel temperature measurement by adopting various thermocouple types (supporting T, K, E, J type thermocouples), and combining multiple reference points at the cold end, so as to realize temperature compensation of different hot ends and cold ends, ensure that the measured temperature can truly reflect the electric potential difference of the hot ends and the cold ends, thereby reducing the error of correction temperature and actual temperature and improving the accuracy of correction temperature.
The step S13 includes:
s131: obtaining a mapping curve of cold end temperature and temperature drift coefficient;
S132: obtaining a board-carried temperature drift coefficient through checking a mapping curve by a cold end temperature value;
the mapping curve is related to the cold end material.
The technical scheme is adopted: and obtaining an on-board temperature drift coefficient corresponding to the cold end temperature according to the mapping curve of the cold end temperature and the temperature drift coefficient, so that the calculated hot end temperature is more accurate.
Besides the hot end temperature correction by the temperature drift coefficient in the scheme, the temperature of the hot end can be corrected by on-board voltage measurement. Further preferably, the second detection path includes:
s21: collecting the measurement potential difference of the hot end through a multi-path temperature collecting unit 1;
s22: converting the collected measurement potential difference of the hot end into the temperature difference of the battery to be measured through filtering partial pressure and differential amplification;
S23: converting the cold end voltage measured on board into cold end temperature;
S24: and adding the temperature difference of the battery to be measured and the cold end temperature to obtain the corrected temperature.
In the scheme, the final correction temperature of the battery can be calculated by combining the temperature difference measured by the cold end temperature and the hot end temperature, so that the error between the correction temperature and the actual temperature can be reduced, and the accuracy of the correction temperature is improved.
Further comprises: and S25, correcting the final temperature by the correction module to obtain a corrected temperature.
It is worth mentioning that this scheme is through adopting resistance partial pressure temperature measurement to combine the method of cold junction multiple reference point, realize the temperature compensation of different hot junction and cold junction, guaranteed that the temperature that measures can truly reflect the difference in temperature of hot junction and cold junction, thereby reduced correction temperature and actual temperature's error, improved the precision of measuring temperature.
The multi-path temperature acquisition unit 1 comprises a plurality of temperature sensor modules 2, and the temperature sensor modules 2 are uniformly arranged on each measuring point according to the area of the battery to be measured.
In the above scheme, the temperature sensor modules 2 are uniformly distributed on each measurement point of the battery, so that the error of final measurement can be reduced.
The cold end voltage is a voltage value which is measured and far away from the board of the object to be measured.
According to the scheme, the on-board voltage far away from the object to be measured can be measured, the on-board voltage is converted into the cold end temperature, and the cold end temperature and the hot end temperature difference are combined to finally obtain the correction temperature.
A power battery temperature detection system, applied to the temperature detection method as described above, characterized by comprising: the temperature compensation device comprises a multipath temperature acquisition unit 1, a voltage temperature conversion unit 7, a cold end temperature compensation unit 5, a temperature drift unit 8 and a temperature correction unit 6, wherein the multipath temperature acquisition unit 1 is electrically connected with the voltage temperature conversion unit 7, the cold end temperature compensation unit 5 is electrically connected with the temperature drift unit 8, and the temperature correction unit 6 is electrically connected with the temperature drift unit 8 and the voltage temperature conversion unit 7.
The multi-path temperature acquisition unit 1 comprises a plurality of temperature sensor modules 2, a filtering voltage division module 3 and a differential amplification module 4. The temperature sensor module may employ a thermocouple and a thermal resistor, and may employ a PT100 or NTC sensor when a thermal resistor is employed.
It is worth mentioning that the invention can adopt various thermocouple models to develop multichannel temperature measurement or resistance voltage division temperature measurement methods, and combines cold end compensation technology to realize high-precision and low-time-delay temperature acquisition.
The temperature drift unit 8 is a temperature drift coefficient curve corresponding to different cold end temperatures according to the device characteristics, and searches the corresponding temperature drift coefficient through the cold end temperatures.
The formula set in the temperature correction unit 6 is:
；
wherein, In order to correct the temperature of the liquid,Is the coefficient of temperature drift and the temperature drift,Is the hot end temperature.
The device elements in the above embodiments are conventional device elements unless otherwise specified, and the connection and control methods are conventional connection and control methods unless otherwise specified.
While the invention has been described with reference to the embodiments, those skilled in the art will understand that various specific parameters in the above embodiments may be changed without departing from the spirit of the invention, and thus a plurality of specific embodiments are common variation ranges of the invention, and will not be described in detail herein.
Claims (10)
1. A power battery temperature detection method, comprising a first detection path and a second detection path, the first detection path comprising:
S11: acquiring the voltage of each resistor of the multipath resistors of the battery to be tested;
S12: amplifying the voltage through a differential amplifying circuit, and checking the mapping relation between the voltage and the temperature of the resistor to obtain the hot end temperature of the battery to be tested;
s13: acquiring the cold end temperature of the board, and acquiring the temperature drift coefficient of the board through the cold end temperature and the temperature drift coefficient curve;
S14: and correcting the hot end temperature and the on-board temperature drift coefficient through a temperature correction unit (6) to obtain a corrected temperature.
2. The power battery temperature detection method according to claim 1, wherein the S13 includes:
s131: obtaining a mapping curve of cold end temperature and temperature drift coefficient;
S132: obtaining a board-carried temperature drift coefficient through checking a mapping curve by a cold end temperature value;
the mapping curve is related to the cold end material.
3. The power cell temperature detection method according to claim 1, wherein the second detection path includes:
S21: collecting the measurement potential difference of the hot end through a multi-path temperature collecting unit (1);
s22: converting the collected measurement potential difference of the hot end into the temperature difference of the battery to be measured through filtering partial pressure and differential amplification;
S23: converting the cold end voltage measured on board into cold end temperature;
S24: and adding the temperature difference of the battery to be measured and the cold end temperature to obtain the corrected temperature.
4. A power cell temperature detection method according to claim 3, further comprising: and S25, correcting the final temperature by the temperature correction module to obtain a corrected temperature.
5. A method for detecting the temperature of a power battery according to claim 3, wherein the multi-path temperature acquisition unit (1) comprises a plurality of temperature sensor modules (2), and the temperature sensor modules (2) are uniformly arranged on each measuring point according to the area of the battery to be detected.
6. A method for detecting the temperature of a power battery according to claim 3, wherein the cold end voltage is a voltage value measured on board away from an object to be detected.
7. A power battery temperature detection system applied to the temperature detection method according to any one of claims 1 to 6, comprising: multichannel temperature acquisition unit (1), voltage temperature conversion unit (7), cold junction temperature compensation unit (5), temperature drift unit (8) and temperature correction unit (6), multichannel temperature acquisition unit (1) with voltage temperature conversion unit (7) electricity is connected, cold junction temperature compensation unit (5) with temperature drift unit (8) electricity is connected, temperature correction unit (6) with temperature drift unit (8) and voltage temperature conversion unit (7) electricity are connected.
8. The power battery temperature detection system according to claim 7, wherein the multi-path temperature acquisition unit (1) comprises a plurality of temperature sensor modules (2), a filtering voltage division module (3) and a differential amplification module (4).
9. The power battery temperature detection system according to claim 7, wherein the temperature drift unit (8) is a temperature drift coefficient curve corresponding to different cold end temperatures given according to device characteristics, and the corresponding temperature drift coefficients are searched through the cold end temperatures.
10. The power battery temperature detection system according to claim 1, wherein the formula set in the temperature correction unit (6) is:
；
wherein, In order to correct the temperature of the liquid,Is the coefficient of temperature drift and the temperature drift,Is the hot end temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410647462.6A CN118549001A (en) | 2024-05-23 | 2024-05-23 | Power battery temperature detection system and detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410647462.6A CN118549001A (en) | 2024-05-23 | 2024-05-23 | Power battery temperature detection system and detection method |
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| CN118549001A true CN118549001A (en) | 2024-08-27 |
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