Measurement method and data processing method for working noise of high-voltage relay of battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a measuring method and a data processing method for working noise of a high-voltage relay of a battery pack, and the measuring method comprises the steps: placing the battery pack provided with the high-voltage relay in a semi-anechoic chamber of which the background noise is not greater than a preset noise threshold value; respectively arranging microphones meeting the requirements of the type 1 instrument at preset heights right above the geometric centers of a main positive relay and a main negative relay of the high-voltage relay; applying control voltage to relay coils of the main positive relay and the main negative relay, and respectively controlling the main positive relay and the main negative relay to execute actuation and disconnection actions; a data acquisition and analysis system is used for acquiring noise signals generated in the closing and opening processes of the main positive relay and the main negative relay; carrying out A weighting processing on the collected noise signal, and calculating a loudness signal based on a preset free field standard; and evaluating the working noise level of the high-voltage relay based on the sound pressure level peak value of the processed noise signal and the loudness peak value of the loudness signal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery pack high-voltage relay working noise measurement method, a battery pack high-voltage relay working noise test data processing method, a battery pack high-voltage relay working noise measurement system and a computer readable storage medium. BACKGROUND

[0002] New energy vehicles generally use high-voltage battery packs to provide power. In order to ensure the normal on-off of the electrical system, a high-voltage DC relay needs to be configured. The high-voltage DC relay is essentially an electromagnetic relay, which uses an input signal to generate an electromagnetic force in the electromagnetic core to attract the armature, so as to make the contact move to realize the opening, closing or switching control of a kind of electromechanical element. The high-voltage DC relay is usually installed in the high-voltage distribution box, and the high-voltage distribution box is usually installed in the battery pack. The electromagnetic relay will produce a short-acting impact when the armature is attracted and disconnected. The noise caused by this impact will reduce the user experience. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, the first object of the present application is to provide a battery pack high-voltage relay working noise measurement method, which can measure the battery pack high-voltage relay working noise, can evaluate the working noise level of the battery pack high-voltage relay, and improve the user experience.

[0004] The second object of the present application is to provide a battery pack high-voltage relay working noise test data processing method.

[0005] The third object of the present application is to provide a battery pack high-voltage relay working noise measurement system.

[0006] The fourth object of the present application is to provide a computer readable storage medium.

[0007] To achieve the above object, the first aspect of the present application provides a battery pack high-voltage relay working noise measurement method, comprising the following steps: placing a battery pack with a high-voltage relay in a semi-anechoic chamber with background noise not greater than a preset noise threshold; arranging a microphone conforming to the requirements of a type 1 instrument at a predetermined height directly above the geometric centers of the main positive relay and the main negative relay of the high-voltage relay; applying a control voltage to the relay coils of the main positive relay and the main negative relay to control the main positive relay and the main negative relay to perform closing and opening actions, respectively; using a data acquisition and analysis system to collect noise signals generated by the main positive relay and the main negative relay during the closing and opening processes; performing A-weighting processing on the collected noise signals and calculating a loudness signal based on a preset free-field standard; and evaluating the working noise level of the high-voltage relay based on the sound pressure level peak value of the processed noise signals and the loudness peak value of the loudness signal.

[0008] In addition, the battery pack high-voltage relay working noise measurement method according to the above-mentioned embodiments of the present application can also have the following additional technical features: According to some embodiments of the present application, the arrangement height of the microphone is 1 meter directly above the geometric centers of the main positive relay and the main negative relay, and the direction of the microphone is perpendicular to the ground and is aligned with the geometric centers of the main positive relay and the main negative relay.

[0009] According to some embodiments of the present application, before and after each noise measurement, a 1st level sound calibrator is used to calibrate the microphone, and the deviation of the two calibrations is not greater than 0.5 dB.

[0010] According to some embodiments of the present application, the control voltage is 12 V DC.

[0011] According to some embodiments of the present application, the closing and opening actions of the main positive relay and the main negative relay are performed at least 10 times for noise data collection, respectively.

[0012] According to some embodiments of the present application, the time constant used to calculate the loudness signal based on the preset free-field standard is 0.02 seconds.

[0013] The method for measuring the working noise of the high-voltage relay of the battery pack according to the embodiment of the application comprises the following steps: placing the battery pack provided with the high-voltage relay in a semi-anechoic chamber with background noise not greater than a preset noise threshold; arranging a microphone meeting the requirements of a type 1 instrument at a predetermined height directly above the geometric centers of the main positive relay and the main negative relay of the high-voltage relay; applying a control voltage to the relay coils of the main positive relay and the main negative relay to control the main positive relay and the main negative relay to perform the actions of attraction and disconnection, respectively; collecting the noise signals generated by the main positive relay and the main negative relay during the actions of attraction and disconnection by using a data acquisition and analysis system; performing A-weighting processing on the collected noise signals and calculating the loudness signals based on a preset free-field standard; and evaluating the working noise level of the high-voltage relay based on the sound pressure level peak values of the processed noise signals and the loudness peak values of the loudness signals. Thus, the method can measure the working noise of the high-voltage relay of the battery pack, can evaluate the working noise level of the high-voltage relay of the battery pack, and improves the user experience.

[0014] The present application aims to solve at least one of the technical problems in the related art. To this end, a second object of the present application is to provide a method for processing test data of the working noise of the high-voltage relay of the battery pack, which can process the test data of the working noise of the high-voltage relay of the battery pack, can evaluate the working noise level of the high-voltage relay of the battery pack, and improves the user experience.

[0015] To achieve the above object, the second embodiment of the present application provides a method for processing test data of the working noise of the high-voltage relay of the battery pack, which is applied to the data collected by the method for measuring the working noise of the high-voltage relay of the battery pack, and comprises the following steps: obtaining the sound pressure level peak values and the loudness peak values of the main positive relay and the main negative relay in the states of attraction and disconnection in multiple measurements; based on the sound pressure level peak values and the loudness peak values, extracting the attraction maximum total noise value, the disconnection maximum total noise value, the attraction maximum loudness value, and the disconnection maximum loudness value; and comprehensively evaluating the working noise level of the high-voltage relay of the battery pack based on the attraction maximum total noise value, the disconnection maximum total noise value, the attraction maximum loudness value, and the disconnection maximum loudness value.

[0016] The method for processing test data of working noise of a battery pack high-voltage relay according to the embodiment of the application comprises: obtaining sound pressure level peaks and loudness peaks of a main positive relay and a main negative relay in the closing and opening states in multiple measurements; based on the sound pressure level peaks and the loudness peaks, extracting a closing maximum total noise value, an opening maximum total noise value, a closing maximum loudness value, and an opening maximum loudness value; and based on the closing maximum total noise value, the opening maximum total noise value, the closing maximum loudness value, and the opening maximum loudness value, comprehensively evaluating the working noise level of the battery pack high-voltage relay. Thus, the method can process the test data of the working noise of the battery pack high-voltage relay, can evaluate the working noise level of the battery pack high-voltage relay, and improves the user experience.

[0017] The present application aims to at least solve one of the technical problems in the related art. To this end, a third object of the present application is to provide a measurement system for working noise of a battery pack high-voltage relay, which can measure the working noise of the battery pack high-voltage relay, can evaluate the working noise level of the battery pack high-voltage relay, and improves the user experience.

[0018] To achieve the above object, the third aspect of the present application provides a measurement system for working noise of a battery pack high-voltage relay, which is used to implement the measurement method for working noise of a battery pack high-voltage relay described above, and the system comprises: a semi-anechoic chamber for providing a test environment with a background noise of not more than 25 dB(A); a microphone conforming to the Type 1 instrument requirements specified in GB / T 3785.1, which is arranged directly above the geometric center of a main positive relay and a main negative relay; a data acquisition and analysis system, which has an A / D conversion resolution of not less than 24 bit, and is configured to perform A-weighted sound pressure level measurement and loudness analysis based on the ISO 532B free field standard on the acquired noise signals; and a relay control unit configured to provide control voltage to the relay coils of the main positive relay and the main negative relay to drive the closing and opening thereof.

[0019] In addition, the measurement system for working noise of a battery pack high-voltage relay according to the above-mentioned embodiments of the present application can have the following additional technical features: According to some embodiments of the present application, the measurement system for working noise of a battery pack high-voltage relay described above further comprises an acoustic calibrator conforming to the Level 1 requirements specified in GB / T 15173, which is used to calibrate the microphone before and after measurement.

[0020] The battery pack high-voltage relay working noise measurement system according to the embodiment of the present application comprises: a semi-anechoic chamber for providing a test environment with a background noise of no more than 25 dB(A); a microphone conforming to the Type 1 instrument requirement specified in GB / T 3785.1, the microphone being arranged directly above the geometric center of the main positive relay and the main negative relay; a data acquisition and analysis system, the A / D conversion resolution of the data acquisition and analysis system being no less than 24 bit, and the data acquisition and analysis system being configured to perform A-weighted sound pressure level measurement and loudness analysis based on the ISO 532B free field standard on the acquired noise signal; and a relay control unit configured to provide control voltage to the relay coils of the main positive relay and the main negative relay to drive the main positive relay and the main negative relay to be attracted and released. Thus, the system can measure the working noise of the battery pack high-voltage relay, and can evaluate the working noise level of the battery pack high-voltage relay, thereby improving the user experience.

[0021] To achieve the above object, the fourth aspect of the present application provides a computer readable storage medium, and the program or instructions are stored on the readable storage medium, and the program or instructions are executed by the processor to implement the steps of the battery pack high-voltage relay working noise test data processing method described above.

[0022] According to the computer readable storage medium of the embodiment of the present application, by executing the battery pack high-voltage relay working noise test data processing method described above, the test data of the battery pack high-voltage relay working noise can be processed, the working noise level of the battery pack high-voltage relay can be evaluated, and the user experience can be improved.

[0023] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A flowchart of the battery pack high-voltage relay working noise measurement method according to some embodiments of the present application; Figure 2 A schematic diagram of the noise measurement point position according to some embodiments of the present application; Figure 3 A flowchart of the battery pack high-voltage relay working noise test data processing method according to some embodiments of the present application; Figure 4 A schematic diagram of the framework of the battery pack high-voltage relay working noise measurement system according to some embodiments of the present application. DETAILED DESCRIPTION

[0025] To make the object, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0026] It should be noted that, unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the common meaning understood by one of ordinary skill in the art to which the present application pertains. The terms "first", "second", and similar terms used in the embodiments of the present application do not denote any order, quantity, or importance, but are used to distinguish different components. The terms "include", "contain", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms do not mean physical or mechanical connection, but can include electrical connection, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships can also change accordingly.

[0027] As described in the background section, new energy vehicles generally use high-voltage battery packs to provide power. In order to ensure the normal on-off of the electrical system, a high-voltage DC relay needs to be configured. The high-voltage DC relay is essentially an electromagnetic relay, which uses input signals (voltage, current) to generate electromagnetic force in the electromagnetic core, attract the armature, and thus make the contact move to realize opening, closing or switching control. The high-voltage DC relay is usually installed in a high-voltage distribution box, and the high-voltage distribution box is usually installed in the battery pack. The electromagnetic relay will produce a short-acting impact when the armature is attracted and opened, and the noise caused by this impact is easy to cause user complaints and reduce user experience. Therefore, it is necessary to measure and analyze the working noise of the high-voltage DC relay of the entire battery pack.

[0028] The battery pack high-voltage relay working noise measurement method, battery pack high-voltage relay working noise test data processing method, battery pack high-voltage relay working noise measurement system, and computer readable storage medium proposed by the embodiments of the present application will be described below with reference to the accompanying drawings.

[0029] Reference Figure 1 The flowchart of the battery pack high-voltage relay working noise measurement method according to some embodiments of the present application is shown in FIG. 1.

[0030] As Figure 1 shown, the battery pack high-voltage relay working noise measurement method of the embodiments of the present application can include the following steps: S101, place the battery pack with the installed high-voltage relay in a semi-anechoic chamber with background noise not greater than a preset noise threshold.

[0031] Specifically, the test should be carried out in a semi-anechoic chamber, and during the measurement, the battery pack with a high-voltage relay installed is placed in a semi-anechoic chamber with background noise not greater than a preset noise threshold (such as 25 dB(A)) to eliminate the interference of environmental noise on the action sound of the relay, wherein the acoustic environment of the test chamber should meet the requirements of GB / T 6882 standard, and the battery pack related information is filled in the record table. The battery pack related information recorded in the record table can include: project name, nominal capacity (Ah), single body, series-parallel connection mode, sample size (length x width x height mm), Pack voltage range (V), battery pack type, whether it is a special modification, and input voltage of the battery management system.

[0032] S102, a microphone meeting the requirements of Type 1 instrument is arranged at a predetermined height above the geometric centers of the main positive relay and the main negative relay of the high-voltage relay.

[0033] Specifically, referring to Figure 2 A schematic diagram of the noise measurement point position according to some embodiments of the present application is shown in the figure. The corresponding positions of the geometric centers of the main positive relay and the main negative relay of the high-voltage relay are marked on the battery pack upper cover plate. A microphone meeting the requirements of Type 1 instrument is arranged at a predetermined height (such as 1±0.02 m) above the geometric centers of the main positive relay and the main negative relay of the high-voltage relay, and the direction of the microphone is directed to the geometric center of the relay perpendicular to the ground. Wherein, the microphone or other equivalent measurement system for measurement should meet the requirements of Type 1 instrument specified in GB / T 3785.1.

[0034] S103, a control voltage is applied to the relay coil of the main positive relay and the main negative relay to control the main positive relay and the main negative relay to perform the closing and opening actions, respectively.

[0035] Specifically, after the microphone is arranged, a control voltage is applied to the relay coil of the main positive relay and the main negative relay to trigger the closing (normally open contact closed) and opening (contact separation) actions of the main positive / main negative relay by applying the control voltage, simulate the switching process under actual working conditions, and the noise generated in this process is derived from physical phenomena such as contact bounce, electromagnetic force mutation, mechanical collision, etc., which is a key indicator for evaluating the reliability and electromagnetic compatibility of the relay.

[0036] S104, the noise signals generated by the main positive relay and the main negative relay during the closing and opening processes are collected using a data acquisition and analysis system.

[0037] Specifically, the noise signals generated by the main positive relay and the main negative relay during the closing and opening processes are collected using a data collection and analysis system, wherein the A / D conversion resolution of the data collection and analysis system is not less than 24 bit, and the data collection and analysis system has a data sampling capacity of at least 51.2 kHz and has a sound pressure level measurement and spectrum analysis function.

[0038] In S105, the collected noise signals are subjected to A-weighting processing, and a loudness signal is calculated based on a preset free field standard.

[0039] Specifically, after the noise signals are collected, the collected noise signals are subjected to A-weighting processing to convert the broadband noise into an equivalent "A-weighted sound pressure level" (dB(A)), so that the measurement result is closer to the subjective feeling of the human ear. And based on the preset free field standard, the loudness signal is calculated, wherein the loudness calculation selects ISO 532B-free field, and the peak values of the processed noise signal and the loudness signal are subjected to subsequent data statistical analysis, with the unit being dB(A), sone. The test results of the battery pack high-voltage relay working noise / loudness are filled in the record table. The main test results recorded in the record table can include: the peak value of the noise signal when the main positive relay is 100 cm above and the main positive relay and the main negative relay are closed; the peak value of the loudness signal when the main positive relay is 100 cm above and the main positive relay and the main negative relay are closed; the peak value of the noise signal when the main positive relay is 100 cm above and the main positive relay and the main negative relay are opened; the peak value of the loudness signal when the main positive relay is 100 cm above and the main positive relay and the main negative relay are opened; the peak value of the noise signal when the main negative relay is 100 cm above and the main positive relay and the main negative relay are closed; the peak value of the loudness signal when the main negative relay is 100 cm above and the main positive relay and the main negative relay are closed; the peak value of the noise signal when the main negative relay is 100 cm above and the main positive relay and the main negative relay are opened; the peak value of the loudness signal when the main negative relay is 100 cm above and the main positive relay and the main negative relay are opened; the maximum value of the peak value of the noise signal and the maximum value of the peak value of the loudness signal obtained by collecting data for 10 times; the maximum value of the background noise before the test; the maximum value of the background noise after the test.

[0040] In S106, the working noise level of the high-voltage relay is evaluated based on the sound pressure level peak value of the processed noise signal and the loudness peak value of the loudness signal.

[0041] Specifically, the peak value of the sound pressure level of the noise signal reflects the physical energy of the noise, and is directly related to the vibration intensity of the mechanical structure of the relay (such as contact bounce and electromagnetic vibration); the peak value of the loudness of the loudness signal reflects the subjective interference degree of the noise, and is affected by the frequency distribution and the duration (such as high-frequency sharp noise with higher loudness). Based on the peak value of the sound pressure level of the processed noise signal and the peak value of the loudness of the loudness signal, the working noise level of the high-voltage relay is evaluated, and through the joint analysis of the A-weighted sound pressure level and the loudness, the working noise level of the high-voltage relay can be comprehensively evaluated, which provides a quantitative basis for product design optimization (such as contact structure, electromagnetic shielding, and damping material) and meets the stringent requirements of the automotive industry on NVH (Noise, Vibration and Harshness) performance.

[0042] In some embodiments of the present application, the arrangement height of the microphones is 1 meter directly above the geometric centers of the main positive relay and the main negative relay, and the direction of the microphones is aligned vertically to the ground to the geometric centers of the main positive relay and the main negative relay.

[0043] Specifically, at 1 meter directly above the geometric centers of the main positive relay and the main negative relay of the high-voltage relay, a microphone conforming to the requirements of Type 1 instrument is arranged respectively, and the direction of the microphone is aligned vertically to the ground to the geometric centers of the main positive relay and the main negative relay, wherein the error tolerance range can be 0.02 meters.

[0044] In some embodiments of the present application, before and after each noise measurement, the microphone is calibrated using a Class 1 sound calibrator, and the deviation of the two calibrations is not more than 0.5 dB.

[0045] Specifically, before and after each noise measurement, each microphone must be calibrated using a Class 1 sound calibrator conforming to GB / T 15173. Without any adjustment, the deviation of the two calibrations is not more than 0.5 dB. If the deviation is exceeded, the measurement result is invalid.

[0046] In some embodiments of the present application, the control voltage is direct current 12 V.

[0047] Further, in some embodiments of the present application, at least 10 times of noise data acquisition are performed for the closing and opening actions of the main positive relay and the main negative relay.

[0048] Specifically, the control relay coil voltage is direct current 12 V, the main positive / negative relay is controlled to close, the noise data when the relay closes is recorded, and a total of 10 groups of data are collected. The control relay coil voltage is direct current 12 V, the main positive / negative relay is controlled to open, the noise data when the relay opens is recorded, and a total of 10 groups of data are collected.

[0049] In some embodiments of the present application, the time constant used to calculate the loudness signal based on the preset free-field standard is 0.02 seconds.

[0050] Specifically, the time constant used to calculate the loudness signal based on the preset free-field standard is 0.02 seconds. A too small time constant (such as 1 millisecond) will cause the loudness signal to fluctuate sharply and it is difficult to capture a stable peak value. A too large time constant (such as 100 milliseconds) will smooth out the transient characteristics and underestimate the noise interference. The time constant of 0.02 seconds is the recommended value for transient noise in the Zwicker loudness model, which takes into account sensitivity and robustness.

[0051] In summary, the battery pack high-voltage relay operating noise measurement method according to the embodiments of the present application includes the following steps: placing the battery pack with the high-voltage relay in a semi-anechoic chamber with background noise not greater than a preset noise threshold; arranging a microphone conforming to the requirements of a type 1 instrument above the geometric center of the main positive relay and the main negative relay at a predetermined height; applying a control voltage to the relay coil of the main positive relay and the main negative relay to control the main positive relay and the main negative relay to perform the closing and opening actions, respectively; using a data acquisition and analysis system to collect the noise signals generated by the main positive relay and the main negative relay during the closing and opening processes; performing A-weighting processing on the collected noise signals and calculating the loudness signal based on the preset free-field standard; and evaluating the operating noise level of the high-voltage relay based on the sound pressure level peak value of the processed noise signal and the loudness peak value of the loudness signal. Thus, the method can measure the operating noise of the battery pack high-voltage relay, evaluate the operating noise level of the battery pack high-voltage relay, and improve the user experience.

[0052] Reference Figure 3 The flowchart of the battery pack high-voltage relay operating noise test data processing method according to some embodiments of the present application is shown in FIG. 5.

[0053] As Figure 3 shown, the battery pack high-voltage relay operating noise test data processing method according to the embodiments of the present application can include the following steps: S301, obtaining the sound pressure level peak value and the loudness peak value of the main positive relay and the main negative relay in the closing and opening states in multiple measurements.

[0054] Specifically, a high-precision sound level meter or acoustic analyzer can be used to ensure that the device can accurately capture the sound pressure level peak and loudness peak. According to the instructions of the measuring device, set appropriate measurement parameters such as measurement range, time weight, frequency weight, etc. For sound pressure level peak measurement, usually choose fast response or impulse response mode; for loudness peak measurement, it may be necessary to use special loudness analysis software or module. Perform multiple closing and opening operations on each relay sample, and record the sound pressure level peak and loudness peak after each operation.

[0055] S302, based on the sound pressure level peak and the loudness peak, the closing maximum total noise value, the opening maximum total noise value, the closing maximum loudness value and the opening maximum loudness value are extracted.

[0056] Specifically, after obtaining the sound pressure level peak and the loudness peak, based on the sound pressure level peak and the loudness peak, the closing maximum total noise value, the opening maximum total noise value, the closing maximum loudness value and the opening maximum loudness value are extracted, for example, the closing maximum total noise value: 69 dB (sound pressure level peak); the opening maximum total noise value: 75 dB (sound pressure level peak); the closing maximum loudness value: 83 sone; the opening maximum loudness value: 90 sone. The sound pressure level peak (75 dB) and the loudness peak (90 sone) in the opening state are significantly higher than those in the closing state (69 dB / 83 sone), indicating that the noise generated by the relay in the opening state is more prominent.

[0057] S303, based on the closing maximum total noise value, the opening maximum total noise value, the closing maximum loudness value and the opening maximum loudness value, the working noise level of the battery pack high-voltage relay is comprehensively evaluated.

[0058] Specifically, after obtaining the closing maximum total noise value, the opening maximum total noise value, the closing maximum loudness value and the opening maximum loudness value, based on the closing maximum total noise value, the opening maximum total noise value, the closing maximum loudness value and the opening maximum loudness value, the working noise level of the battery pack high-voltage relay is comprehensively evaluated, for example, if the loudness value is significantly higher than the sound pressure level expectation (such as sound pressure level 69 dB but loudness 83 sone), there may be high-frequency noise components, which need to be located by spectrum analysis.

[0059] In summary, according to the battery pack high-voltage relay working noise test data processing method of the embodiment of the present application, the peak sound pressure level and the peak loudness of the main positive relay and the main negative relay in the closing and opening states in multiple measurements are obtained; the closing maximum total noise value, the opening maximum total noise value, the closing maximum loudness value and the opening maximum loudness value are extracted based on the peak sound pressure level and the peak loudness; and the working noise level of the battery pack high-voltage relay is comprehensively evaluated based on the closing maximum total noise value, the opening maximum total noise value, the closing maximum loudness value and the opening maximum loudness value. Thus, the method can process the test data of the working noise of the battery pack high-voltage relay, can evaluate the working noise level of the battery pack high-voltage relay, and improves the user experience.

[0060] It should be noted that the method of the embodiments of the present application can be executed by a single device, such as a computer or a server, etc. The method of the embodiments can also be applied to a distributed scenario, and completed by multiple devices cooperating with each other. In the case of such a distributed scenario, one of the multiple devices can only execute one or more steps in the method of the embodiments of the present application, and the multiple devices can interact with each other to complete the above method.

[0061] It should be noted that some embodiments of the present application have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than the order described above and still achieve desirable results. In addition, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order, to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0062] Corresponding to the above embodiments, the present application also proposes a battery pack high-voltage relay working noise measurement system.

[0063] As shown in Figure 4 , the battery pack high-voltage relay working noise measurement system of the present application comprises a semi-anechoic chamber, a microphone, a data acquisition and analysis system, a relay control unit and a sound calibrator.

[0064] Further, the semi-anechoic chamber can provide a test environment with a background noise of not more than 25 dB(A).

[0065] Further, the microphone applies a microphone meeting the Type 1 instrument requirements specified in GB / T 3785.1, and the microphone can be arranged directly above the geometric center of the main positive relay and the main negative relay.

[0066] Further, the A / D conversion resolution of the data acquisition and analysis system is not less than 24 bit, and the A / D conversion resolution of the data acquisition and analysis system can be configured to perform A-weighted sound pressure level measurement on the collected noise signal and loudness analysis based on the ISO 532B free field standard.

[0067] Further, the relay control unit can provide control voltage to the relay coils of the main positive relay and the main negative relay to drive the main positive relay and the main negative relay to be attracted and released.

[0068] Further, the sound calibrator meets the 1st level requirement of GB / T 15173, and the sound calibrator can calibrate the microphone before and after measurement.

[0069] In summary, the battery pack high-voltage relay operating noise measurement system according to the embodiment of the present application comprises: a semi-anechoic chamber for providing a test environment with background noise not greater than 25 dB(A); a microphone conforming to the 1st type instrument requirement of GB / T 3785.1, the microphone being configured to be arranged directly above the geometric center of the main positive relay and the main negative relay; a data acquisition and analysis system, the A / D conversion resolution of the data acquisition and analysis system being not less than 24 bit, and the data acquisition and analysis system being configured to perform A-weighted sound pressure level measurement on the collected noise signal and loudness analysis based on the ISO 532B free field standard; and a relay control unit configured to provide control voltage to the relay coils of the main positive relay and the main negative relay to drive the main positive relay and the main negative relay to be attracted and released. Thus, the system can measure the battery pack high-voltage relay operating noise, can evaluate the operating noise level of the battery pack high-voltage relay, and improves the user experience.

[0070] Based on the same inventive concept, the present application also provides a computer readable storage medium storing computer instructions for causing a computer to execute the method of any of the above embodiments.

[0071] The above computer readable storage medium can be any available medium or data storage device accessible by a computer, including but not limited to magnetic storage (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor memory (e.g., ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid state disk (SSD), etc.).

[0072] The computer instructions stored in the storage medium of the above embodiments are used to cause a computer to execute the method of any of the above exemplary method embodiments, and have the beneficial effects of the corresponding method embodiments, which are not repeated here.

[0073] Furthermore, although the operations of the method of the present application are described in a particular, sequential order, this order is not meant to be a limitation and is not intended to imply that the operations be performed in the order described but is intended to illustrate the logic order rather than suggest requirements or limitations as to the actual order of the operations. Further, some steps can be performed in an order other than the order described. Additionally or alternatively, some steps can be performed concurrently. Additionally or alternatively, some steps can be performed by different entities than the entities described.

[0074] It is to be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiments, the various steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, and in another embodiment, any of the following technologies, known in the art, or a combination thereof, can be used: discrete logic circuitry having logic gates for implementing logic functions upon an application of data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0075] It should be noted that the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by those skilled in the art to which the present application belongs, unless otherwise defined. The terms "first", "second", and the like used in the embodiments of the present application do not represent any order, number, or importance, but are only used to distinguish different components. The terms "include", "contain", and the like mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may

[0076] Although the spirit and principles of the present application have been described with reference to several specific embodiments, it should be understood that the present application is not limited to the disclosed specific embodiments, and the division of aspects does not mean that the features in these aspects cannot be combined for benefit, but is only for the convenience of expression. The present application is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the appended claims. The scope of the appended claims is the broadest interpretation, so as to include all such modifications and equivalent structures and functions.

Claims

1. A method for measuring the operating noise of a high-voltage relay in a battery pack, characterized in that, Includes the following steps: Place the battery pack equipped with the high-voltage relay in a semi-anechoic chamber where the background noise does not exceed a preset noise threshold. At a predetermined height directly above the geometric center of the main positive relay and the main negative relay of the high voltage relay, microphones conforming to the requirements of Type 1 instrument are respectively arranged. A control voltage is applied to the relay coils of the main positive relay and the main negative relay to control the main positive relay and the main negative relay to perform the engaging and disengaging actions, respectively; The noise signals generated by the main positive relay and the main negative relay during the activation and deactivation process are collected using a data acquisition and analysis system. The collected noise signal is subjected to A-weighting processing, and the loudness signal is calculated based on a preset free field standard. The operating noise level of the high-voltage relay is evaluated based on the peak sound pressure level of the processed noise signal and the peak loudness of the loudness signal.

2. The method for measuring the operating noise of the high-voltage relay in a battery pack according to claim 1, characterized in that, The microphone is positioned 1 meter directly above the geometric center of the main positive relay and the main negative relay, and the microphone is oriented perpendicular to the ground and aligned with the geometric center of the main positive relay and the main negative relay.

3. The method for measuring the operating noise of the high-voltage relay in a battery pack according to claim 1, characterized in that, Before and after each noise measurement, the microphone was calibrated using a Class 1 acoustic calibrator, and the deviation between the two calibrations was no greater than 0.5 dB.

4. The method for measuring the operating noise of the high-voltage relay in a battery pack according to claim 1, characterized in that, The control voltage is DC 12 V.

5. The method for measuring the operating noise of the high-voltage relay in a battery pack according to claim 1, characterized in that, For each of the main positive relay and the main negative relay's activation and deactivation actions, noise data is collected at least 10 times.

6. The method for measuring the operating noise of the high-voltage relay in a battery pack according to claim 1, characterized in that, The time constant used to calculate the loudness signal based on the preset free field standard is 0.02 seconds.

7. A method for processing test data on the operating noise of a high-voltage relay in a battery pack, characterized in that, The data collected by the method for measuring the operating noise of the battery pack high-voltage relay as described in any one of claims 1 to 6 includes: The peak sound pressure level and peak loudness of the main positive relay and the main negative relay in the engaged and disengaged states were obtained in multiple measurements. Based on the peak sound pressure level and the peak loudness, the maximum total noise value when attracted, the maximum total noise value when disconnected, the maximum loudness value when attracted, and the maximum loudness value when disconnected are statistically extracted. The operating noise level of the battery pack high-voltage relay is comprehensively evaluated based on the maximum total noise value when engaged, the maximum total noise value when disengaged, the maximum loudness value when engaged, and the maximum loudness value when disengaged.

8. A measurement system for the operating noise of a high-voltage relay in a battery pack, characterized in that, A method for measuring the operating noise of a battery pack high-voltage relay as described in any one of claims 1 to 6, the system comprising: A semi-anechoic chamber is used to provide a test environment with background noise not exceeding 25 dB(A); Microphone, using a microphone conforming to the requirements of a Type 1 instrument as specified in GB / T 3785.1, the microphone being configured to be positioned directly above the geometric center of the main positive relay and the main negative relay; A data acquisition and analysis system, wherein the A / D conversion resolution of the data acquisition and analysis system is not less than 24 bits, and is configured to perform A-weighted sound pressure level measurement and loudness analysis based on ISO 532B free field standard on the acquired noise signal; The relay control unit is configured to provide control voltage to the relay coils of the main positive relay and the main negative relay to drive them to engage and disengage.

9. The measurement system for the operating noise of the high-voltage relay in a battery pack according to claim 8, characterized in that, It also includes an acoustic calibrator that meets the Class 1 requirements specified in GB / T 15173 and is used to calibrate the microphone before and after measurement.

10. A computer-readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the test data processing method for the operating noise of the battery pack high-voltage relay as described in claim 7.

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