CN113206324A - Power battery heating noise optimization method and device - Google Patents
Power battery heating noise optimization method and device Download PDFInfo
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- CN113206324A CN113206324A CN202110413382.0A CN202110413382A CN113206324A CN 113206324 A CN113206324 A CN 113206324A CN 202110413382 A CN202110413382 A CN 202110413382A CN 113206324 A CN113206324 A CN 113206324A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/008—Arrangement or mounting of electrical propulsion units with means for heating the electrical propulsion units
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The scheme relates to a method and a device for optimizing heating noise of a power battery, which are used for reducing the sound pressure level and the sharpness of the noise in the battery heating process and improving the sound quality of the heating noise of the battery. The power battery heating noise optimization method comprises the following steps: selecting a basic fixed-frequency switching frequency for enabling the IGBT to output pulse current; selecting a frequency bandwidth which enables the amplitude of the pulse current output by the IGBT to be optimal; generating a random variable frequency switching frequency based on the basic fixed frequency switching frequency and the frequency bandwidth; outputting the random variable frequency switching frequency to an IGBT (insulated gate bipolar transistor), and enabling the IGBT to output pulse current according to the random variable frequency switching frequency so as to perform pulse heating on the power battery, so that the heating rate of the power battery is the highest, and the sound pressure level and the noise sharpness of noise generated in the heating process of the power battery both meet the preset noise optimization requirement; the frequency value of the random variable frequency switching frequency is within a frequency range formed by the basic fixed frequency switching frequency and the target frequency switching frequency.
Description
Technical Field
The invention belongs to the field of NVH noise control optimization, and particularly relates to a method and a device for optimizing heating noise of a power battery.
Background
The new energy automobile battery is mainly a lithium battery, and the electrolyte movement of the lithium battery is slowed down in a low-temperature environment, so that the transfer activity of lithium ions between a positive electrode and a negative electrode is influenced, and the charge and discharge performance of the lithium battery is reduced. The lithium iron phosphate battery has the worst performance of charge and discharge performance at low temperature, the working temperature of the lithium iron phosphate battery is generally required to be above minus 20 ℃, and the charge and discharge performance of the lithium iron phosphate battery below minus 20 ℃ is severely limited. Therefore, in a low temperature environment of-20 ℃ or lower, the battery needs to be heated to maintain the charge and discharge performance of the battery.
Methods for heating batteries are classified into an external heating method and an internal heating method. The external heating method is to heat a heat transfer medium outside the battery, and then to heat the battery by heat transfer of the heat transfer medium. The external heating method includes circulating liquid heating and electric heating plate heating, for example, circulating water is heated by a motor rotor blocking, and then the battery is heated by the circulating water, and the PTC film of the battery is heated. But the external heating method has the defects of complex structure and poor temperature rise uniformity.
The internal heating method is to heat the battery by joule heat generated by the internal resistance of the battery using a large current. The internal heating method mainly comprises charging heating, discharging heating and alternating current heating, and is relatively simple in structure and good in heating speed and temperature rise uniformity. In the process of heating the battery by adopting a charging and discharging heating method, the large-amplitude direct current is easy to cause the graphite of the negative electrode of the lithium ion battery to generate lithium deposition, so that the service life of the battery is rapidly reduced; in the process of heating the battery by adopting the alternating current heating method, as long as the frequency of the alternating current is ensured to be high enough, the service life of the battery is not influenced. Therefore, the method of heating the inside of the battery is mainly a high-frequency alternating current heating method.
In a high-voltage system composed of a new energy automobile power lithium battery and a motor, the internal resistance of the lithium battery is increased at low temperature, the inductance characteristic of the motor can be utilized, the whole high-voltage loop generates high-frequency alternating current pulse current through rapidly switching on and off an IGBT, and the frequency of the alternating current is one half of the switching frequency of the IGBT. The high-frequency alternating current pulse current can heat the battery core through joule heat generated by the internal resistance of the battery, so that the charge and discharge performance of the power lithium battery at low temperature is improved. In practical applications, a large magnitude of alternating current is required to obtain good battery heating performance. In the high-voltage system of the motor assembly, besides the motor coil, there are some electronic components such as a filter capacitor and an inductor. Under the excitation of large-amplitude alternating current, electronic components such as motor coils, filter capacitors and inductors can vibrate, so that a motor assembly can generate high-frequency sharp noise, and the subjective feeling of drivers and passengers inside and outside a vehicle can be seriously influenced by the sharp noise.
Disclosure of Invention
The invention aims to provide a method and a device for optimizing heating noise of a power battery, so as to reduce the sound pressure level and sharpness of the noise in the battery heating process, improve the sound quality of the heating noise of the battery and improve the sound quality.
The technical scheme of the invention is as follows:
the embodiment of the invention provides a power battery heating noise optimization method, which comprises the following steps:
selecting a basic fixed-frequency switching frequency for enabling the IGBT to output pulse current;
selecting a frequency bandwidth which enables the amplitude of the pulse current output by the IGBT to be optimal;
generating a random variable frequency switching frequency based on the fundamental fixed frequency switching frequency and the frequency bandwidth;
outputting the random variable frequency switching frequency to an IGBT (insulated gate bipolar transistor), and enabling the IGBT to output pulse current according to the random variable frequency switching frequency so as to perform pulse heating on the power battery, so that the heating rate of the power battery is the highest, and the sound pressure level and the noise sharpness of the noise generated in the heating process of the power battery both meet the preset noise optimization requirement;
the frequency value of the random variable frequency switching frequency is located in a frequency range formed by the basic fixed frequency switching frequency and a target frequency switching frequency, and the target frequency switching frequency is the sum of the basic fixed frequency switching frequency and the frequency bandwidth.
The step of selecting the basic fixed-frequency switching frequency for enabling the IGBT to output the pulse current comprises the following steps:
based on a preset corresponding relation of the service life of the power battery, the heating rate of the power battery and the basic fixed-frequency switching frequency, which is obtained by a previous experiment, one or more basic fixed-frequency switching frequencies are screened out, and the service life of the power battery is within an acceptable range;
and selecting one basic fixed-frequency switching frequency with the highest heating rate of the power battery from the screened one or more basic fixed-frequency switching frequencies as the basic fixed-frequency switching frequency for enabling the IGBT to output pulse current.
The step of selecting the frequency bandwidth which enables the pulse current amplitude output by the IGBT to be optimal comprises the following steps:
and selecting a frequency bandwidth which enables the pulse current amplitude output by the IGBT to be optimal based on a preset relation between the pulse current amplitude output by the IGBT and the frequency bandwidth obtained through experiments in advance.
Wherein the step of generating a random variable switching frequency based on the fundamental fixed switching frequency and the frequency bandwidth comprises:
outputting the basic fixed frequency switching frequency and the frequency bandwidth to a preset first random function, wherein the first random function sequentially generates a plurality of random switching frequencies at random;
and sequentially adding the basic switching frequency and each random switching frequency to obtain the random variable frequency switching frequency.
Wherein the first random function is a RAND () function.
Wherein the step of generating the random variable switching frequency based on the fundamental fixed switching frequency and the frequency bandwidth comprises:
adding the basic switching frequency and the frequency bandwidth to obtain a target frequency switching frequency;
and randomly taking values from a frequency range formed by the basic fixed-frequency switching frequency and the target frequency switching frequency by using a preset second random function to form the random variable-frequency switching frequency.
Wherein the second random function is a RANDBETWEEN () function.
The embodiment of the invention also provides a power battery heating noise optimization device, which comprises:
the first selection module is used for selecting basic fixed-frequency switching frequency for enabling the IGBT to output pulse current;
the second selection module is used for selecting a frequency bandwidth which enables the pulse current amplitude output by the IGBT to be optimal;
a generating module, configured to generate a random variable frequency switching frequency based on the basic fixed frequency switching frequency and the frequency bandwidth;
the output module is used for outputting the random variable frequency switching frequency to the IGBT, so that the IGBT performs pulse current output according to the random variable frequency switching frequency to perform pulse heating on the power battery, the heating rate of the power battery is the highest, and the sound pressure level and the noise sharpness of the noise generated in the heating process of the power battery both meet the preset noise optimization requirement;
the frequency value of the random variable frequency switching frequency is located in a frequency range formed by the basic fixed frequency switching frequency and a target frequency switching frequency, and the target frequency switching frequency is the sum of the basic fixed frequency switching frequency and the frequency bandwidth.
The invention has the beneficial effects that:
the frequency of the pulse current output by the IGBT is changed from a fixed frequency mode to a variable frequency mode: in a fixed frequency mode, the battery heating noise frequency is represented by a single frequency and a frequency doubling characteristic thereof, the single frequency energy distribution is high, the battery heating noise is not easily masked by background noise, and the battery heating noise is sharp and harsh, so that the battery heating noise cannot be accepted by a user; under the frequency conversion mode, the frequency of the battery heating noise is represented as a random characteristic, the energy distribution is uniform, the battery heating noise is easy to mask, and the battery heating noise is easy to accept. Meanwhile, the proper random variable frequency switching frequency is selected by combining the heating rate of the power battery and the influence of the service life of the battery, so that the sharpness and the sound pressure level of noise generated by the pulse current output by the IGBT according to the random variable frequency switching frequency are both within the acceptable range of a human body, and the effect of noise optimization is achieved.
Drawings
FIG. 1-1 is a diagram of a noise spectrum analysis when an IGBT outputs a pulse current at a constant frequency for heating a power battery;
FIG. 1-2 is a current spectrum analysis diagram of the IGBT when outputting pulse current at a fixed frequency as power battery heating;
FIG. 2-1 is a graph of the correspondence between different fundamental switching frequencies and the heating rate of a power cell;
FIG. 2-2 is a graph of the relationship between different frequency bandwidths and the amplitude of the pulse current at a 1300Hz base switching frequency;
FIGS. 2-3 are graphs of random switching frequency versus time generated by a first random function at a frequency bandwidth of 500 Hz;
FIGS. 2-4 are graphs of final switching frequency versus time generated based on a random switching frequency and a base switching frequency;
FIG. 3-1 is a comparison of battery heating noise spectra before and after optimization;
fig. 3-2 is a comparison of the pulse current spectrum before and after optimization.
FIG. 4-1 is a graph comparing results of near field sound pressure levels of battery heating cells before and after optimization;
FIG. 4-2 is a graph comparing results of battery heating cell near field sharpness before and after optimization;
FIG. 5 is a schematic flow chart of the method of the present invention;
FIG. 6 is a second flowchart of the method of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1-1 and fig. 1-2, the inventor conducts spectrum analysis on battery heating noise through experiments, and finds that the noise spectrum is represented by the fixed frequency and the frequency doubling characteristic, the noise spectrum and the frequency spectrum of the alternating current correspond to each other, the frequency spectrum of the alternating current is also represented by the fixed frequency and the frequency doubling characteristic, and the frequency spectrum characteristic of the alternating current is closely related to the control strategy of the switching frequency of the IGBT. Therefore, the inventor has determined that optimizing the noise generated during the battery heating process requires optimizing the control strategy for the IGBT fixed frequency switching frequency.
The control strategy for optimizing the battery heating noise in the present invention refers to a control strategy for optimizing the IGBT switching frequency from a fixed frequency to a random frequency, as shown in fig. 5 and 6, in this embodiment, the specific steps for implementing the optimization of the battery heating noise include:
The lower the temperature of the power battery is, the poorer the discharge performance of the power battery is; correspondingly, the higher the demand of the power battery for heating, the greater the magnitude of the demand of the pulse alternating current required for heating. The amplitude of the pulse alternating current is strongly related to the basic fixed-frequency switching frequency of the IGBT, and specifically, the lower the basic fixed-frequency switching frequency of the pulse current output by the IGBT is, the larger the effective value of the pulse alternating current is, and the better the heating performance of the battery is.
The inventor performs a battery heating performance test under different IGBT switching frequencies (through experiments, in order to meet the requirement that the service life of a power battery is not affected, in this embodiment, the IGBT switching frequency during the battery heating performance test is tested from 1300Hz, because the switching frequency below 1300Hz leads the service life of the power battery to be affected, through a preliminary experiment, an initial frequency range in which the influence of the battery service life is within an acceptable range can be determined in advance), and a correlation diagram of the basic fixed-frequency switching frequency and the heating rate of the IGBT is prepared (as shown in fig. 2-1). As can be seen from fig. 2-1, as the basic constant frequency switching frequency of the IGBT switch gradually increases, the heating speed of the power battery also becomes worse. And, in this embodiment, the heating rate of the power battery is fastest under the base fixed frequency switching frequency of 1300 Hz. Therefore, in the embodiment, in order to achieve the optimal heating performance of the pulse heating of the power battery, the basic fixed-frequency switching frequency of the initial IGBT is 1300 Hz.
In this embodiment, for power batteries of different models, the specific steps of selecting the fundamental fixed-frequency switching frequency are as follows: the method comprises the steps of obtaining a preset relation table about the battery life of the power battery, the battery heating rate and the basic fixed-frequency switching frequency of the IGBT based on a pre-test, firstly selecting one or more basic fixed-frequency switching frequencies which enable the battery life to be within an acceptable range, and then selecting one basic fixed-frequency switching frequency which enables the heating rate of the power battery to be optimal from the selected one or more basic fixed-frequency switching frequencies.
However, tests show that under the condition that the IGBT continuously uses 1300Hz of basic fixed-frequency switching frequency to output pulse current for heating the power battery, noise generated in the heating process of the power battery is sharp and harsh, so that user experience is poor, and therefore the noise generated in the heating process needs to be optimized.
Through a plurality of experiments, the inventor finds that in the process of pulse heating of the power battery, the frequency of the pulse current output by the IGBT is changed from a fixed frequency to a variable frequency mode, so that the finally measured noise sound quality parameter can be greatly reduced. For this reason, several means for changing the pulse current output from the IGBT into a variable frequency form are provided in the present embodiment.
The frequency of the pulse current output by the IGBT is changed randomly.
In this embodiment, step 2 needs to be performed first, and a frequency bandwidth for optimizing the amplitude of the pulse current output by the IGBT is selected. In this process, the selection of specific parameters of the frequency bandwidth is determined based on a corresponding relationship diagram of random switching frequencies of different bandwidths and the pulse current amplitude output by the IGBT, and the frequency bandwidth with the maximum pulse current amplitude is selected as the frequency bandwidth required in this embodiment.
For example, by increasing random switching frequencies of different frequency bandwidths on the basis of a basic fixed-frequency switching frequency of 1300Hz, pulse currents under the random switching frequencies of different frequency bandwidths are tested, and a correlation diagram of the random switching frequencies of different bandwidths and the amplitudes of the pulse currents is made (see fig. 2-2). As can be seen from the associated fig. 2-2, in the present embodiment, the frequency bandwidth of the random switching frequency for the power cell to have the optimum heating performance is 500 Hz.
Further, the random variable switching frequency output to the IGBT required in the present embodiment needs to be calculated.
As shown in fig. 5, in one implementation manner, the method in this embodiment includes:
Specifically, a random switching frequency of a certain frequency bandwidth is generated using a first random function (e.g., RAND () function). The random switching frequency is an output value of the first random function, and the random switching frequency required in the present embodiment is randomly generated by the first random function by inputting the basic switching frequency and the frequency bandwidth into the first random function.
After the step 3, the random switching frequency shown in fig. 3 can be obtained.
And step 312, obtaining the optimized random variable frequency switching frequency.
Specifically, in this embodiment, the random variable frequency switching frequency is obtained by superposing the basic fixed frequency switching frequency selected in step 1 and the random switching frequency obtained by solving in step 2, so as to obtain the final random variable frequency switching frequency required by the IGBT. The desired random variable switching frequency for the final IGBT = fundamental fixed switching frequency + RAND () bandwidth. Referring to fig. 2-4, in this embodiment, the optimal requirement for the heating performance of the power battery is comprehensively considered, and the final random frequency conversion switching frequency is 1300Hz to 1800 Hz.
As shown in fig. 6, in this embodiment, another implementation means is further provided:
The target fixed frequency switching frequency is the sum of the base fixed frequency switching frequency and the frequency bandwidth.
Step 323, randomly taking a value from a frequency range formed by the basic fixed-frequency switching frequency and the target fixed-frequency switching frequency to form the random variable-frequency switching frequency by using a preset second random function (such as RANDBETWEEN () function).
And the frequency value of the random variable frequency switching frequency generated by the random value taking of the second random function is positioned in a frequency range formed by the basic fixed frequency switching frequency and the target frequency switching frequency. In this embodiment, the frequency value of the random variable frequency switching frequency is between 1300HZ (basic fixed frequency switching frequency) and 1800HZ (target fixed frequency switching frequency).
And finally, executing the step 4, outputting the random variable frequency switching frequency obtained in the step 312 or the step 322 to the IGBT, and enabling the IGBT to output pulse current according to the random variable frequency switching frequency so as to perform pulse heating on the power battery, so that the heating rate of the power battery is the highest, and the sound pressure level and the noise sharpness of the noise generated in the heating process of the power battery both meet the preset noise optimization requirement.
In order to demonstrate the effectiveness of the random frequency conversion means for controlling the frequency of the pulse current output by the IGBT, the inventor carries out subjective evaluation and objective test on the heating noise of the power battery under the basic fixed frequency switching frequency before optimization and the heating noise of the power battery under the optimized random frequency conversion switching frequency. As shown in fig. 3-1 and fig. 3-2, through analysis and comparison, the frequency spectrum characteristic of the noise changes from the peak characteristic of the fixed frequency before optimization to the flat characteristic of the random frequency conversion, and simultaneously, the frequency spectrum characteristic of the pulse current also changes from the peak characteristic of the fixed frequency before optimization to the flat characteristic of the random frequency conversion after optimization; meanwhile, as shown in fig. 4-1 and 4-2, the noise of the near field of the motor is reduced by 10dB (A), the sharpness is reduced by 40%, the noise sound pressure level of the near field of the motor and the noise sharpness value of the near field of the motor are both greatly reduced, and the noise optimization effect is obvious.
The embodiments described above describe only some of the one or more embodiments of the present invention, but those skilled in the art will recognize that the invention can be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (8)
1. A method for optimizing heating noise of a power battery is characterized by comprising the following steps:
selecting a basic fixed-frequency switching frequency for enabling the IGBT to output pulse current;
selecting a frequency bandwidth which enables the amplitude of the pulse current output by the IGBT to be optimal;
generating a random variable frequency switching frequency based on the fundamental fixed frequency switching frequency and the frequency bandwidth;
outputting the random variable frequency switching frequency to an IGBT (insulated gate bipolar transistor), and enabling the IGBT to output pulse current according to the random variable frequency switching frequency so as to perform pulse heating on the power battery, so that the heating rate of the power battery is the highest, and the sound pressure level and the noise sharpness of the noise generated in the heating process of the power battery both meet the preset noise optimization requirement;
the frequency value of the random variable frequency switching frequency is located in a frequency range formed by the basic fixed frequency switching frequency and a target frequency switching frequency, and the target frequency switching frequency is the sum of the basic fixed frequency switching frequency and the frequency bandwidth.
2. The method of claim 1, wherein the step of selecting a fundamental fixed frequency switching frequency that causes the IGBT to output a pulsed current comprises:
based on a preset corresponding relation of the service life of the power battery, the heating rate of the power battery and the basic fixed-frequency switching frequency, which is obtained by a previous experiment, one or more basic fixed-frequency switching frequencies are screened out, and the service life of the power battery is within an acceptable range;
and selecting one basic fixed-frequency switching frequency with the highest heating rate of the power battery from the screened one or more basic fixed-frequency switching frequencies as the basic fixed-frequency switching frequency for enabling the IGBT to output pulse current.
3. The method of claim 1, wherein the step of selecting a frequency bandwidth that optimizes the amplitude of the pulse current output by the IGBT comprises:
and selecting a frequency bandwidth which enables the pulse current amplitude output by the IGBT to be optimal based on a preset relation between the pulse current amplitude output by the IGBT and the frequency bandwidth obtained through experiments in advance.
4. The method of claim 1, wherein generating a randomly variable switching frequency based on the base fixed frequency switching frequency and the frequency bandwidth comprises:
outputting the basic fixed frequency switching frequency and the frequency bandwidth to a preset first random function, wherein the first random function sequentially generates a plurality of random switching frequencies at random;
and sequentially adding the basic switching frequency and each random switching frequency to obtain the random variable frequency switching frequency.
5. Method according to claim 4, characterized in that said first random function is a RAND () function.
6. The method of claim 1, wherein generating the randomly variable switching frequency based on the fundamental fixed switching frequency and the frequency bandwidth comprises:
adding the basic switching frequency and the frequency bandwidth to obtain a target frequency switching frequency;
and randomly taking values from a frequency range formed by the basic fixed-frequency switching frequency and the target frequency switching frequency by using a preset second random function to form the random variable-frequency switching frequency.
7. Method according to claim 6, characterized in that said second random function is a RANDBETWEEN () function.
8. A power battery heating noise optimization device, characterized by comprising:
the first selection module is used for selecting basic fixed-frequency switching frequency for enabling the IGBT to output pulse current;
the second selection module is used for selecting a frequency bandwidth which enables the pulse current amplitude output by the IGBT to be optimal;
a generating module, configured to generate a random variable frequency switching frequency based on the basic fixed frequency switching frequency and the frequency bandwidth;
the output module is used for outputting the random variable frequency switching frequency to the IGBT, so that the IGBT performs pulse current output according to the random variable frequency switching frequency to perform pulse heating on the power battery, the heating rate of the power battery is the highest, and the sound pressure level and the noise sharpness of the noise generated in the heating process of the power battery both meet the preset noise optimization requirement;
the frequency value of the random variable frequency switching frequency is located in a frequency range formed by the basic fixed frequency switching frequency and a target frequency switching frequency, and the target frequency switching frequency is the sum of the basic fixed frequency switching frequency and the frequency bandwidth.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113715692A (en) * | 2021-09-28 | 2021-11-30 | 重庆长安新能源汽车科技有限公司 | Control system and control method for pulse heating noise of power battery of electric automobile |
| CN114361654A (en) * | 2021-12-29 | 2022-04-15 | 重庆长安新能源汽车科技有限公司 | Battery pulse heating sound optimization control method, device and device |
| EP4199648A1 (en) * | 2021-12-17 | 2023-06-21 | Chongqing Changan New Energy Vehicles Technology Co., Ltd | Sound controlling method and device of pulse heating for power battery and electric vehicle |
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