CN112034347A - Lithium ion battery thermal runaway rapid monitoring method and system - Google Patents
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 56
- 238000012544 monitoring process Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000001453 impedance spectrum Methods 0.000 claims abstract description 56
- 230000008859 change Effects 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000004146 energy storage Methods 0.000 abstract description 6
- 238000004088 simulation Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
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- 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]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
-
- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Abstract
The invention discloses a lithium ion battery thermal runaway rapid monitoring method and a system, a battery to be tested is placed still in a constant temperature environment to make the internal and external temperatures consistent, then impedance spectrums of the battery to be tested in different constant temperature states are measured, the impedance spectrum in the battery can be accurately obtained, a phase angle under characteristic frequency is obtained according to the impedance spectrums of the battery to be tested in different constant temperature states under corresponding temperatures, the obtained internal temperature value of the battery to be tested in different states is made into a temperature change fitting curve, a phase angle-temperature fitting curve is established according to the phase angle under the characteristic frequency and the constant temperature of the battery to be tested which is obtained corresponding to the phase angle, the change of the internal temperature of the battery can be rapidly and accurately monitored through the functional relation between the phase angle value and the internal temperature of the battery, time and space lead are reserved for the thermal runaway of the lithium ion, the thermal runaway of the battery can be greatly reduced, and the safe operation and maintenance level of a large energy storage power station or a power battery system can be improved.
Description
Technical Field
The invention relates to a battery operation and maintenance technology, in particular to a lithium ion battery thermal runaway rapid monitoring method and a lithium ion battery thermal runaway rapid monitoring system.
Background
The energy storage provides important technical support for ubiquitous power internet of things including clean energy consumption, comprehensive energy services and the like, and more lithium battery energy storage power stations are becoming important components of links such as power grid power generation and transmission transformation and distribution. However, the lithium ion battery is often in fire accident, which brings great loss of life and property to people in production and life. Because lithium ion batteries are high energy devices containing large amounts of active chemical components, their chemical energy content is about ten times the maximum storable amount of the battery itself. The energy released by ignition of a lithium ion battery is about one third of the energy released by gasoline with the same volume, and the heat release rate is almost equivalent to that of an open fire. Unlike gasoline, which has been used for more than 100 years, lithium ion batteries have a huge room for improvement in safety and thermal runaway prevention methods. Leakage, explosion and fire of the lithium ion battery will cause fatal results and huge property loss. If a potential thermal runaway signal of the lithium ion battery can be monitored in advance, time and space for taking preventive measures are reserved for preventing the thermal runaway of the lithium ion battery, and many lithium ion battery thermal runaway practices which should not happen are avoided. Therefore, a rapid monitoring method for preventing thermal runaway of the lithium ion battery is a core technology which is very concerned by operation and maintenance personnel of a battery system.
Some previous studies have been made on monitoring methods for preventing thermal runaway of lithium ion batteries. (early warning method for thermal runaway of lithium ion battery) CN201910682445.5 proposes an early warning method for thermal runaway of lithium ion battery, which comprises the following steps: the method comprises the following steps: performing analog simulation on the lithium ion battery to obtain the surface temperature data and deformation data of the shell of the lithium ion battery during normal charging and discharging of the lithium ion battery and at the moment of thermal runaway of overcharge, and establishing a battery temperature distribution model; step two: in the battery temperature distribution model, determining the positions of a surface temperature highest point P1 and a surface temperature lowest point P2 when the lithium ion battery is normally used; step three: monitoring the temperature difference delta T and the deformation difference delta d between P1 and P2 of the lithium ion battery in the using process in real time through a monitoring device; step four: and judging the running state of the lithium ion battery according to a preset condition. The maximum temperature difference of the battery body and the deformation of the shell are jointly used, so that the early monitoring of thermal runaway of the battery can be effectively carried out. The patent has certain reference significance, but the surface temperature data and the deformation data of the shell at the moment of thermal runaway of the battery are still data with rapid changes, and only a rough judgment can be given for the prevention of the thermal runaway of the lithium ion battery. CN201911043531.8 proposes a thermal runaway monitoring device and method for power lithium ion battery pack, which includes a first unit, a second unit and a third unit connected in sequence; the first unit is used for acquiring voltage signals, temperature signals and current signals of the battery pack and transmitting the acquired voltage signals, temperature signals and current signals of the battery pack to the second unit; the second unit is used for monitoring the thermal runaway condition or risk of the battery pack in real time through a set algorithm according to the temperature signal, the voltage signal and the current signal of the battery pack, which are acquired by the first unit; the second unit is also used for periodically sending a voltage signal, a temperature signal and a current signal of the battery pack to the third unit through the communication bus. The defects that a power lithium battery management system in the prior art lacks a method and function for predicting and early warning thermal runaway of the battery in advance are effectively overcome by combining other structures or methods. The lithium ion battery pack thermal runaway monitoring method provided by the patent is not specific and has no operability. Based on the electrochemical reaction mechanism and the heat generation characteristic principle of the battery, thermoelectric characteristic tests and modeling simulation calculation are carried out on the lithium ion battery, the temperature change characteristic of the battery under the charging condition is researched, and a heat abuse model is further established according to the characteristic, so that the properties of battery monomers under different parameters are analyzed, the research on the change of the chemical reaction inside the battery under the over-charging thermal runaway working condition is realized, and the problems that the existing thermal runaway simulation method based on the over-charging lithium ion battery is lack of comprehensive analysis on the electrochemical reaction mechanism and the heat generation characteristic and the specificity of different battery monomers is not considered are solved. The patent only proposes a thermal runaway simulation method based on an overcharged lithium ion battery, and the thermal runaway simulation method is still commonly detected based on the temperature change characteristic of a battery shell, and the conduction of the temperature change inside the battery to the temperature change of the battery shell needs time and has temperature gradient difference, so that the rapid detection for preventing the thermal runaway of the lithium ion battery cannot be realized.
At present, the main purpose of preventing the thermal runaway of the lithium ion battery is to monitor the surface temperature index of the battery, which is an explicit and external index of the battery performance, but the thermal runaway cannot be avoided when the large increase of the surface temperature of the battery is possibly monitored.
Disclosure of Invention
The invention aims to provide a method and a system for rapidly monitoring thermal runaway of a lithium ion battery, which aim to overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a lithium ion battery thermal runaway rapid monitoring method comprises the following steps:
step 1), standing a battery to be tested in a constant temperature environment to enable the internal temperature and the external temperature of the battery to be tested to be consistent;
step 2), measuring impedance spectrums of the battery to be measured in different constant temperature states;
step 3), acquiring a phase angle under characteristic frequency according to the impedance spectrum of the battery to be tested under different constant temperature states and corresponding temperatures;
step 4), establishing a phase angle-temperature fitting curve according to the phase angle under the characteristic frequency and the constant temperature of the battery to be measured corresponding to the phase angle;
and 5) monitoring and acquiring an impedance spectrum of the battery to be tested in the use state, and obtaining the temperature corresponding to the phase angle under the characteristic frequency in the impedance spectrum of the battery to be tested in the use state as the internal temperature of the battery to be tested according to the phase angle-temperature curve.
Further, standing the battery to be tested in an incubator to ensure that the environmental temperature T in the incubatorsurfAnd the internal temperature T of the batteryintAnd (5) the consistency is achieved.
Further, specifically, the battery to be tested is placed in an incubator for at least 12 hours.
Further, an electrochemical impedance spectrometer is adopted to test the impedance spectrum of the battery to be tested.
Further, the characteristic frequency is 30-100 Hz.
Further, the characteristic frequency is 40 Hz.
Furthermore, an electrochemical impedance spectrometer is adopted to measure the impedance spectrum of the battery to be measured in different working states, a phase angle value at the characteristic frequency is obtained according to the impedance spectrum, and the temperature value corresponding to the phase angle value in the phase angle-temperature fitting curve is the internal temperature of the battery to be measured.
Furthermore, the obtained internal temperature values of the battery to be tested in different states are made into a temperature change fitting curve, and the internal temperature change trend of the battery to be tested can be obtained.
A lithium ion battery thermal runaway rapid monitoring method system comprises an impedance spectrum detection module, a phase angle temperature fitting module and a temperature monitoring output module;
the impedance spectrum detection module is used for obtaining an impedance spectrum of the battery to be tested after the battery to be tested is placed at a constant temperature, obtaining a phase angle value under a set characteristic frequency according to the impedance spectrum, inputting the obtained phase angle value to the phase angle temperature fitting module, the phase angle temperature fitting module establishes a phase angle-temperature fitting curve of the battery to be tested according to the constant temperature placing temperature and the corresponding phase angle value, storing the established phase angle-temperature fitting curve of the battery to be tested to the temperature monitoring output module, and the temperature monitoring output module takes the impedance spectrum of the battery to be tested in different using states as input and inputs the temperature of the battery to be tested corresponding to the impedance spectrum in the corresponding state.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a lithium ion battery thermal runaway rapid monitoring method, which utilizes a constant temperature environment to lead a battery to be tested to stand to lead the internal temperature and the external temperature to be consistent, then measuring the impedance spectrum of the battery to be measured under different constant temperature states, being capable of accurately obtaining the impedance spectrum in the battery, obtaining a phase angle under characteristic frequency according to the impedance spectrum of the battery to be tested under different constant temperature states and corresponding temperatures, establishing a phase angle-temperature fitting curve according to the phase angle under the characteristic frequency and the constant temperature of the battery to be measured corresponding to the phase angle, the change of the internal temperature of the battery can be rapidly and accurately monitored through the functional relation between the phase angle value and the internal temperature of the battery, the method reserves the time and space lead for preventing the thermal runaway of the lithium ion battery, greatly reduces the thermal runaway of the battery, and can improve the safe operation and maintenance level of a large-scale energy storage power station or a power battery system.
Furthermore, the phase angle value under the characteristic frequency is monitored through the electrochemical impedance spectrum, the method can be completed within millisecond time, the speed is high, and the measurement is simple.
Furthermore, the device is simple, convenient and easy to operate by standing in a thermostat.
Furthermore, the characteristic frequency is 40Hz, the measurement result is accurate, and the fitting linearity is good.
The lithium ion battery thermal runaway rapid monitoring system is simple in structure, only the impedance spectrum of the battery to be tested at different constant temperatures needs to be monitored as input and the corresponding temperature values, a phase angle-temperature fitting curve is established, then the temperature of the battery to be tested in different use states can be rapidly monitored, and the lithium ion battery thermal runaway rapid monitoring system is simple, rapid and high in accuracy.
Drawings
Fig. 1 is an impedance spectrum of a battery at different temperatures in the example of the present invention.
FIG. 2 shows different internal cell temperatures T according to an embodiment of the present inventionintAnd the characteristic frequency f of the impedance spectrum is equal to the phase angle phi at 40 Hz.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the battery phase angle phi tested by the electrochemical impedance spectroscopy is not greatly related to the ampere-hour capacity of the battery, namely, the battery SOC value, but is along with the internal temperature T of the batteryintBut may vary. Detecting the internal resistance of the battery by using electrochemical impedance spectroscopy to obtain a phase angle phi under a specific frequency, wherein the phase angle phi is the internal temperature T of the batteryintThe characteristic index of (1). The invention is realized by regulating the internal temperature T of the batteryintComparing the phase angle phi with the electrochemical impedance spectrum phase angle phi at different temperatures to establish the phase angle phi and the internal temperature T of the batteryintAnalysis TintAnd the correlation with the phase angle phi, so that the aim of quickly monitoring the thermal runaway of the lithium ion battery is fulfilled, and the safe operation and maintenance level of a battery system is improved.
A rapid monitoring method for preventing thermal runaway of a lithium ion battery comprises the following steps:
step 1), standing a battery to be tested in a constant temperature environment to enable the internal temperature and the external temperature of the battery to be tested to be consistent;
specifically, the battery to be tested is allowed to stand in the incubator for a sufficient time to allow the ambient temperature T in the incubatorsurfAnd the internal temperature T of the batteryintThe aim of making the temperature inside the battery consistent with the temperature outside the battery is fulfilled;
step 2), measuring an impedance spectrum of the battery to be measured in a constant temperature state;
specifically, an electrochemical impedance spectrometer is adopted to test the impedance spectrum of the battery to be tested, and the constant temperature test range is-30-100 ℃;
and 3) obtaining a phase angle phi value at the characteristic frequency in the impedance spectrum of the battery to be tested.
Step 4), repeating the steps 1) to 3), obtaining impedance spectrums of the batteries to be tested at different temperatures, and obtaining the impedance spectrums corresponding to the phase angle phi values at the characteristic frequency positions at different temperatures according to the phase angle phi valuesTemperature data of phi-TintAnd (6) fitting a curve.
Step 5), measuring the impedance spectrum of the battery to be measured in different working states by adopting an electrochemical impedance spectrometer, acquiring a phase angle phi value at the characteristic frequency f of 30-100Hz according to the impedance spectrum, and searching a temperature value corresponding to the phase angle phi value according to the fitting curve in the step 4), wherein the temperature value is the internal temperature T of the battery to be measuredintAnd the value is used for realizing the rapid monitoring of the thermal runaway of the lithium ion battery, and the obtained internal temperature values of the battery to be tested in different states are made into a temperature change fitting curve, so that the internal temperature change trend of the battery to be tested can be obtained.
The method monitors the phase angle phi value under the characteristic frequency through the electrochemical impedance spectrum, has high speed, can be completed within millisecond time, and can monitor the phase angle phi value and the internal temperature T of the battery through the phase angle phi value and the internal temperature T of the batteryintThe functional relation between the temperature and the temperature can be quickly and accurately monitoredintThe change of the time and space lead is reserved for preventing the thermal runaway of the lithium ion battery, the thermal runaway of the battery is greatly reduced, and the safe operation and maintenance level of a large-scale energy storage power station or a power battery system can be improved.
A lithium ion battery thermal runaway rapid monitoring method system comprises an impedance spectrum detection module, a phase angle temperature fitting module and a temperature monitoring output module; the impedance spectrum detection module is used for obtaining an impedance spectrum of the battery to be tested after the battery to be tested is placed at a constant temperature, obtaining a phase angle value under a set characteristic frequency according to the impedance spectrum, inputting the obtained phase angle value to the phase angle temperature fitting module, the phase angle temperature fitting module establishes a phase angle-temperature fitting curve of the battery to be tested according to the constant temperature placing temperature and the corresponding phase angle value, storing the established phase angle-temperature fitting curve of the battery to be tested to the temperature monitoring output module, and the temperature monitoring output module takes the impedance spectrum of the battery to be tested in different using states as input and inputs the temperature of the battery to be tested corresponding to the impedance spectrum in the corresponding state.
The system is simple in structure, only the impedance spectrum of the battery to be tested at different constant temperatures needs to be monitored as input and the corresponding temperature value, a phase angle-temperature fitting curve is established, then the temperature of the battery to be tested at different use states can be rapidly monitored, and the system is simple, rapid and high in accuracy.
Example (b):
step 1: keeping the constant temperature of the battery to be measured for 12 hours to ensure the surface temperature T of the batterysurfAnd the internal temperature T of the batteryintThe consistency is achieved; the battery adopts a commercial lithium ion battery, a 50Ah shallow soup battery (Model: LSE 50-002);
a constant temperature box is adopted as a high-temperature and low-temperature test box for the tin-crown-free sub-battery;
step 2: testing battery impedance spectrums at different temperatures by using a Solartron electrochemical impedance spectrometer, wherein the measurement result is shown in figure 1, the test frequency range is 0.8Hz-1000Hz, and the alternating current disturbance signal is 0.2A (root mean square);
and step 3: finding different temperatures TintThe characteristic frequency f in the battery impedance spectrogram is equal to a phase angle phi value at 40 Hz;
and 4, step 4: the data of the phase angle obtained by the steps 2) and 3) and the temperature value corresponding to the phase angle is taken as phi-TintFitting a curve; as shown in particular in fig. 2;
and 5: measuring impedance spectrums of batteries to be measured in different working states by using an electrochemical impedance spectrometer, searching a phase angle phi value of the battery to be measured at the frequency f of 40Hz according to the impedance spectrums, and searching the internal temperature T of the battery to be measured corresponding to the phase angle phi value according to the fitting curve in the step 4)intAnd the rapid monitoring for preventing the thermal runaway of the lithium ion battery is realized.
Because the electrochemical impedance spectrum monitors the phase angle phi value under the characteristic frequency, the speed is high, and the monitoring can be completed within millisecond time. By establishing the phase angle phi and the internal temperature T of the batteryintThereby quickly and accurately monitoring the internal temperature T of the batteryintA change in (c). The method reserves the time and space lead for preventing the thermal runaway of the lithium ion battery, greatly reduces the thermal runaway of the battery, and can improve the safe operation and maintenance level of a large-scale energy storage power station or a power battery system.
Claims (9)
1. A lithium ion battery thermal runaway rapid monitoring method is characterized by comprising the following steps:
step 1), standing a battery to be tested in a constant temperature environment to enable the internal temperature and the external temperature of the battery to be tested to be consistent;
step 2), measuring impedance spectrums of the battery to be measured in different constant temperature states;
step 3), acquiring a phase angle under characteristic frequency according to the impedance spectrum of the battery to be tested under different constant temperature states and corresponding temperatures;
step 4), establishing a phase angle-temperature fitting curve according to the phase angle under the characteristic frequency and the constant temperature of the battery to be measured corresponding to the phase angle;
and 5) monitoring and acquiring an impedance spectrum of the battery to be tested in the use state, and obtaining the temperature corresponding to the phase angle under the characteristic frequency in the impedance spectrum of the battery to be tested in the use state as the internal temperature of the battery to be tested according to the phase angle-temperature curve.
2. The method for rapidly monitoring the thermal runaway of the lithium ion battery as claimed in claim 1, wherein the battery to be tested is placed in a thermostat statically to ensure that the ambient temperature T in the thermostat is higher than the set temperature TsurfAnd the internal temperature T of the batteryintAnd (5) the consistency is achieved.
3. The method for rapidly monitoring the thermal runaway of the lithium ion battery according to claim 2, wherein specifically, the battery to be tested is allowed to stand in an incubator for at least 12 hours.
4. The method for rapidly monitoring the thermal runaway of the lithium ion battery according to claim 1, characterized in that an electrochemical impedance spectrometer is adopted to test the impedance spectrum of the battery to be tested.
5. The method for rapidly monitoring the thermal runaway of the lithium ion battery according to claim 1, wherein the characteristic frequency is 30-100 Hz.
6. The method for rapidly monitoring the thermal runaway of the lithium ion battery according to claim 1 or 5, wherein the characteristic frequency is 40 Hz.
7. The method for rapidly monitoring the thermal runaway of the lithium ion battery according to claim 1, wherein an electrochemical impedance spectrometer is used for measuring impedance spectra of the battery to be tested in different working states, a phase angle value at a characteristic frequency is obtained according to the impedance spectra, and a temperature value corresponding to the phase angle value in a phase angle-temperature fitting curve is the internal temperature of the battery to be tested.
8. The method for rapidly monitoring the thermal runaway of the lithium ion battery according to claim 7, wherein the obtained internal temperature values of the battery to be tested in different states are made into a temperature change fitting curve, so that the internal temperature change trend of the battery to be tested can be obtained.
9. A lithium ion battery thermal runaway rapid monitoring method system is characterized by comprising an impedance spectrum detection module, a phase angle temperature fitting module and a temperature monitoring output module;
the impedance spectrum detection module is used for obtaining an impedance spectrum of the battery to be tested after the battery to be tested is placed at a constant temperature, obtaining a phase angle value under a set characteristic frequency according to the impedance spectrum, inputting the obtained phase angle value to the phase angle temperature fitting module, the phase angle temperature fitting module establishes a phase angle-temperature fitting curve of the battery to be tested according to the constant temperature placing temperature and the corresponding phase angle value, storing the established phase angle-temperature fitting curve of the battery to be tested to the temperature monitoring output module, and the temperature monitoring output module takes the impedance spectrum of the battery to be tested in different using states as input and inputs the temperature of the battery to be tested corresponding to the impedance spectrum in the corresponding state.
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