Noise testing system and noise testing method

Abstract

The invention provides a noise test system and a noise test method. The noise test system comprises a sound pressure signal acquisition device, a vibration signal acquisition device and a control system. The sound pressure signal acquisition device is used for acquiring sound pressure signals when a relay of the battery pack assembly is closed and released. The vibration signal acquisition device is used for acquiring vibration signals when a relay of the battery pack assembly is closed and released. The control system is used for controlling actuation and release of relays of the battery pack assembly and generating a noise test result according to the collected sound pressure signals and vibration signals, in the process of generating the noise test result, the control system firstly controls actuation and release of all the relays of the battery pack assembly to generate an overall noise test result, and the overall noise test result is generated according to the overall noise test result. And under the condition that the total noise test result represents that the total noise exceeds the standard, the relays of the battery pack assembly are controlled to be closed and released one by one to generate individual noise test results one by one so as to determine the relays with the noise exceeding the standard.

Description

Technical Field

[0001] The present disclosure relates to technical fields such as battery pack assembly testing, and in particular to a noise testing system and a noise testing method. Background Art

[0002] The battery pack assembly is one of the core components of new energy vehicles, and a relay is installed inside it. The relay itself will make noise when it is energized and released. When the relay is set in the relatively closed space of the battery pack assembly, the noise emitted by the relay may be amplified due to the resonance effect, which will affect the vehicle performance. Therefore, it is very important to test the noise of the relay. Summary of the invention

[0003] The present disclosure provides a noise testing system and a noise testing method.

[0004] According to a first aspect of the present disclosure, a noise testing system is provided, comprising: a sound pressure signal acquisition device for acquiring sound pressure signals when a relay of a battery pack assembly is energized and released; a vibration signal acquisition device for acquiring vibration signals when the relay of the battery pack assembly is energized and released; and a control system for controlling the energization and release of the relay of the battery pack assembly, and generating a noise test result according to the acquired sound pressure signals and vibration signals, wherein, in the process of generating the noise test result, the control system first controls all relays of the battery pack assembly to energize and release to generate an overall noise test result, and when the overall noise test result indicates that the overall noise exceeds a standard, the relays of the battery pack assembly are controlled to energize and release one by one to generate individual noise test results one by one, so as to determine the relays with excessive noise.

[0005] According to at least one embodiment of the present disclosure, controlling all relays of the battery pack assembly to be attracted and released includes: controlling the battery pack assembly to execute power-on logic, wherein the power-on logic is the control logic for multiple relays during the power-on process of the battery pack assembly; after an interval of a first time length, controlling the battery pack assembly to execute power-off logic, wherein the power-off logic is the control logic for multiple relays during the power-off process of the battery pack assembly; and after an interval of a second time length, entering the step of controlling the battery pack assembly to execute the power-on logic to perform multiple cycles of power-on and power-off operations of the battery pack assembly.

[0006] According to at least one embodiment of the present disclosure, the relays of the battery pack assembly are controlled to be attracted and released one by one to generate individual noise test results one by one, including: selecting one relay from all the relays; controlling the selected relay to be attracted and released; and generating the individual noise test result of the selected relay according to the sound pressure signal and vibration signal when the selected relay is attracted and released, and entering the step of selecting one relay from all the relays to perform individual noise tests in a loop until the individual noise test results of all the relays are obtained and stop.

[0007] According to at least one embodiment of the present disclosure, controlling the selected relay to be attracted and released includes: controlling the selected relay to be attracted; after an interval of a third time length, controlling the selected relay to be released; and after an interval of a fourth time length, entering a step of controlling the selected relay to be attracted to perform multiple cycles of relay attraction and release operations.

[0008] According to at least one embodiment of the present disclosure, the sound pressure signal collecting device is disposed outside the battery pack assembly and is located near an opening of the battery pack assembly.

[0009] According to at least one embodiment of the present disclosure, there are multiple sound pressure signal collecting devices, and they are arranged at different positions near the opening.

[0010] According to at least one embodiment of the present disclosure, the number of the sound pressure signal collecting devices is three, which are respectively arranged in front of, above and on the left side of the opening.

[0011] According to at least one embodiment of the present disclosure, the distance between the sound pressure signal collecting device and the opening is 100 cm to 120 cm.

[0012] According to at least one embodiment of the present disclosure, the vibration signal collecting device is disposed on the outer surface of the battery pack assembly and is located near an opening of the battery pack assembly.

[0013] According to at least one embodiment of the present disclosure, there are multiple vibration signal collecting devices, and they are arranged on different outer surfaces of the battery pack assembly.

[0014] According to at least one embodiment of the present disclosure, the number of the vibration signal collecting devices is three, which are respectively arranged on the second side surface, the third side surface and the upper surface connected to the first side surface where the opening is located.

[0015] According to at least one embodiment of the present disclosure, the vibration signal collecting device is disposed on the outer surface at a position closest to the opening.

[0016] According to at least one embodiment of the present disclosure, a direct current power supply is further included, and the direct current power supply is used to supply power to the battery pack assembly during the noise test.

[0017] According to at least one embodiment of the present disclosure, an elastic device is further included, wherein the elastic device is used to support the battery pack assembly horizontally in the air during a noise test.

[0018] According to at least one embodiment of the present disclosure, during the noise test, the distance between the lower surface of the battery pack assembly and the ground is 30 cm to 50 cm.

[0019] According to at least one embodiment of the present disclosure, a sound absorbing device is further included, wherein the sound absorbing device is disposed on the ground directly below the sound pressure signal collecting device, and the sound absorbing device is used to absorb noise reflected from the ground.

[0020] According to at least one embodiment of the present disclosure, the sound absorbing device has a length of 100 cm, a width of 100 cm, and a thickness greater than or equal to 2 cm.

[0021] According to at least one embodiment of the present disclosure, the noise testing system is disposed in a semi-anechoic chamber.

[0022] According to a second aspect of the present disclosure, a noise testing method is provided, including: controlling all relays of a battery pack assembly to be energized and released; collecting sound pressure signals and vibration signals generated when all relays are energized and released; generating an overall noise testing result according to the sound pressure signals and vibration signals generated when all relays are energized and released; and, when the overall noise testing result indicates that the overall noise exceeds a standard, controlling the relays of the battery pack assembly to be energized and released one by one to generate individual noise testing results one by one, so as to determine the relays whose noise exceeds the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0024] Figure 1 It is a schematic diagram of an application scenario of a noise testing system according to an embodiment of the present disclosure.

[0025] Figure 2 is a schematic diagram of a noise testing system according to an embodiment of the present disclosure.

[0026] Figure 3 yes Figure 2 Front view of the medium noise test system.

[0027] Figure 4 yes Figure 2 Top view of the medium noise test system.

[0028] Figure 5 is a waveform diagram of a noise signal according to an embodiment of the present disclosure.

[0029] Figure 6 It is a flowchart of a noise testing method according to an embodiment of the present disclosure.

[0030] Figure 7 It is a schematic diagram of a process of controlling all relays according to an embodiment of the present disclosure.

[0031] Figure 8 Schematic diagram of a process of controlling relays one by one according to an embodiment of the present disclosure.

[0032] Fig. 9 is a schematic diagram of a process of controlling a selected relay according to an embodiment of the present disclosure.

[0033] Description of reference numerals:

[0034] Noise testing system 100 , sound pressure signal acquisition device 102 , vibration signal acquisition device 104 , control system 106 , elastic device 108 , DC power supply 110 , sound absorbing device 112 , battery pack assembly 200 , first side 202 , second side 204 , third side 206 , upper surface 208 . DETAILED DESCRIPTION

[0035] The present disclosure is further described in detail below in conjunction with the accompanying drawings and examples. It is understood that the specific examples described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0036] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure can be combined with each other. The technical solution of the present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] The battery pack assembly may be provided with a main positive relay, a main negative relay, a charging positive relay, a charging negative relay, a pre-charging relay and a boost relay. In the vehicle power-on logic, the pre-charging relay is closed first, then the main negative relay is closed, then the main positive relay is closed, and then the pre-charging relay is disconnected; in the vehicle power-off logic, the main positive relay is disconnected first, and then the main negative relay is disconnected. Frequent energization and release of multiple relays will frequently generate noise, and since the relays are arranged in a relatively closed space inside the battery pack assembly, the noise emitted by the relays may be amplified, and the larger noise will reduce the vehicle NVH (Noise Vibration Harshness) performance. In order to determine the relay that causes the overall noise to exceed the standard, in the present disclosure, all relays of the battery pack assembly are first controlled to be energized and released to generate an overall noise test result. When the overall noise test result indicates that the overall noise exceeds the standard, the relays of the battery pack assembly are controlled to be energized and released one by one to generate individual noise test results one by one, thereby determining the relay that causes the overall noise to exceed the standard. To this end, the following technical solution is proposed in the present disclosure.

[0038] Figure 1 A schematic diagram of an application scenario of a noise test system of an embodiment of the present disclosure is shown. In this scenario, a noise test system 100 and a battery pack assembly 200 are arranged in a semi-anechoic chamber, and the noise test system 100 includes a sound pressure signal acquisition device 102, a vibration signal acquisition device 104, a control system 106, an elastic device 108 and a DC power supply 110, and the control system 106 can respectively communicate with the sound pressure signal acquisition device 102, the vibration signal acquisition device 104 and the battery pack assembly 200 by wire and / or wireless communication. The sound pressure signal acquisition device 102 is used to collect the sound pressure signal when the relay of the battery pack assembly 200 is energized and released. The vibration signal acquisition device 104 is used to collect the vibration signal when the relay of the battery pack assembly 200 is energized and released. The control system 106 is used to control the energization and release of the relay of the battery pack assembly 200, and generate a noise test result according to the collected sound pressure signal and vibration signal. The elastic device 108 is used to support the battery pack assembly 200 horizontally in the air during the noise test, so that the battery pack assembly 200 is higher than the ground. The DC power supply 110 is used to supply power to the battery pack assembly 200 during the noise test.

[0039] For the convenience of description and to make the technical solutions of the specific embodiments of the present disclosure easier to understand, before describing the noise test system implemented in the present disclosure, the technical terms involved in the specific embodiments of the present disclosure are defined as follows:

[0040] NVH is the abbreviation of Noise, Vibration and Harshness, and is used to comprehensively measure the quality of automobile manufacturing.

[0041] Sound pressure refers to the change in atmospheric pressure caused by sound wave disturbance, that is, the residual pressure of atmospheric pressure. It is equivalent to superimposing the pressure change caused by a sound wave disturbance on the atmospheric pressure.

[0042] The sound pressure signal is used to characterize the change of sound pressure over time.

[0043] Vibration signals are used to characterize the temporal changes of physical quantities such as displacement, velocity, and acceleration.

[0044] A relay is an electrical device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (electricity, magnetism, sound, light, heat, etc.) reaches the specified requirements. Closing and releasing are the two working states of the relay.

[0045] The battery pack assembly is an integrated component for energy storage and power output. The battery pack assembly may include battery cells, battery management system, relays, connecting cables and casing, etc.

[0046] Power-on logic refers to the control process of multiple relays during the power-on process of the battery pack assembly.

[0047] Power-off logic refers to the control process of multiple relays during the power-off process of the battery pack assembly.

[0048] The installation point refers to the part or position on the battery pack assembly where the sensor can be installed.

[0049] The host computer refers to the device that can directly issue control commands.

[0050] Signal processing equipment refers to equipment that can process the received sound pressure signals and vibration signals and generate noise test results.

[0051] Figure 2 A schematic diagram of a noise testing system according to an embodiment of the present disclosure is shown. Figure 3 Shows Figure 2 Front view of the medium noise test system. Figure 4 Shows Figure 2 Top view of the medium noise test system. Figure 2 The detailed description is for a clearer understanding of the technical solution of the present disclosure and should not be considered as a limitation of the protection scope of the present disclosure. In the process of implementing the technical idea of ​​the present disclosure, one or some devices may be omitted, or other alternatives may be adopted.

[0052] like Figures 2 to 4As shown, the noise testing system 100 may include a sound pressure signal acquisition device 102 (as shown by the green block in the figure), a vibration signal acquisition device 104 (as shown by the blue block in the figure), a control system 106, an elastic device 108, a DC power supply 110 and a sound absorbing device 112 (as shown by the orange block in the figure).

[0053] The sound pressure signal acquisition device 102 is used to collect the sound pressure signal when the relay of the battery pack assembly 200 is energized and released. The sound pressure signal acquisition device 102 can be set according to the structural characteristics of the battery pack assembly 200. For example, the sound pressure signal acquisition device 102 can be set outside the battery pack assembly 200 and near the opening of the battery pack assembly 200. In this way, the arrangement of the sound pressure signal acquisition device 102 is simpler, and because the other parts of the battery pack assembly 200 shell except the opening are closed, the noise transmitted from other parts of the shell except the opening is relatively small, and the noise transmitted near the opening is larger. Therefore, the sound pressure signal acquisition device 102 can effectively collect the sound pressure signal when the relay of the battery pack assembly 200 is energized and released. It can be understood that if there are multiple openings in the battery pack assembly, multiple sound pressure signal acquisition devices can be respectively arranged near the multiple openings, so as to facilitate the all-round testing of the relay noise of the battery pack assembly and improve the accuracy of the test results. For example, Figure 2 The opening of the battery pack assembly 200 shown is a high-voltage harness outlet. If the battery pack assembly has another opening, namely a low-voltage harness outlet, multiple additional sound pressure signal acquisition devices can be set near the low-voltage harness outlet with reference to the high-voltage harness outlet. There are multiple sound pressure signal acquisition devices 102, and they are set at different positions near the opening. In this way, sound pressure signals can be collected from multiple directions at the same time, which is conducive to improving the accuracy of noise test results. Figure 2In the example, the number of sound pressure signal acquisition devices 102 is 3, which are respectively arranged in front of, above and on the left side of the opening, so that the sound pressure signals are collected from 3 different directions at the same time, and the collected sound pressure signals are more real, which can improve the accuracy of the noise test results; in other embodiments, the number of sound pressure signal acquisition devices can also be greater than 3, so that the accuracy of the noise test results can be further improved; in other embodiments, the number of sound pressure signal acquisition devices can also be less than 3, which is conducive to saving noise test costs. The distance between each sound pressure signal acquisition device 102 and the opening is the same, and the distance is 100cm to 120cm, that is, the distance between the sound pressure signal acquisition device 102 and the center of the opening can be 100cm, 105cm, 110cm, 115cm, 120cm or any other value between 100cm and 120cm, so as to improve the accuracy of the noise test results. In one example, the sound pressure signal acquisition device 102 is a free-field microphone, and the distance between the free-field microphone and the opening is 100cm. In this way, the test result is closer to the noise level in the actual use environment. It is understandable that a distance of 100 cm can reduce the sound wave interference caused by the reflective surfaces of the room, thereby obtaining a more realistic sound pressure level reading. At the same time, since the human ear's ability to perceive sound weakens with increasing distance, if the sound pressure signal acquisition device 102 is too far from the opening of the battery pack assembly 200, the noise test requirements cannot be met.

[0054] The vibration signal acquisition device 104 is used to collect vibration signals when the relay of the battery pack assembly 200 is energized and released. The vibration signal acquisition device 104 can be arranged according to the structural differences of the battery pack assembly 200. For example, the vibration signal acquisition device 104 can be arranged on the outer surface of the battery pack assembly 200 and near the opening of the battery pack assembly 200, so that the arrangement of the vibration signal acquisition device 104 is simpler and the vibration signals when the relay of the battery pack assembly 200 is energized and released can be effectively collected. It is understandable that if there are multiple openings in the battery pack assembly, multiple vibration signal acquisition devices can be respectively arranged near the multiple openings, so as to facilitate all-round testing of the relay noise of the battery pack assembly and improve the accuracy of the test results. For example, Figure 2 The opening of the battery pack assembly 200 shown is the high-voltage wiring harness outlet. If the battery pack assembly has another opening, namely the low-voltage wiring harness outlet, multiple vibration signal acquisition devices can be additionally arranged near the low-voltage wiring harness outlet with reference to the high-voltage wiring harness outlet. There are multiple vibration signal acquisition devices 104, and they are arranged on different outer surfaces of the battery pack assembly 200. In this way, vibration signals can be collected from multiple directions at the same time, which is beneficial to improving the accuracy of the noise test results. The battery pack assembly 200 may include a first side 202, a second side 204, a third side 206 and an upper surface 208. Figure 2In the example, the number of vibration signal acquisition devices 104 is 3, which are respectively arranged on the second side 204 connected to the first side 202 where the opening is located, the third side 206 and the upper surface 208, so as to simultaneously collect vibration signals from 3 different positions. The collected vibration signals can fully characterize the complete information of the vibration when the relay generates noise, and can improve the accuracy of the noise test results. In other embodiments, the number of vibration signal acquisition devices 104 can also be greater than 3, so as to further improve the accuracy of the noise test results. Figure 2 In the example, one vibration signal acquisition device 104 is set at the installation point closest to the opening on the upper surface 208, another vibration signal acquisition device 104 is set at the installation point closest to the vertex of the opening on the second side 204, and another vibration signal acquisition device 104 is set at the installation point closest to the vertex of the opening on the third side 206, so as to facilitate the collection of complete information of vibration when the relay generates noise. In one example, the vibration signal acquisition device 104 is a three-axis acceleration sensor, so as to facilitate the measurement of the vibration and noise characteristics (such as frequency, order, sound intensity, etc.) of the battery pack assembly 200.

[0055] The control system 106 is used to control the closure and release of the relays of the battery pack assembly 200, and generate a noise test result based on the collected sound pressure signal and vibration signal. In the process of generating the noise test result, the control system 106 first controls all the relays of the battery pack assembly 200 to closure and release to generate an overall noise test result. When the overall noise test result indicates that the overall noise exceeds the standard, the relays of the battery pack assembly 200 are controlled to closure and release one by one to generate individual noise test results one by one, so as to determine the relays with excessive noise, that is, the relays with individual noise decibels outside the required range. In this way, the overall noise test is first performed, which can help understand the overall noise situation, and then the noise generated by each relay in the battery pack assembly 200 is tested one by one when the overall noise exceeds the standard, so that the noise test efficiency can be improved, and the noise generated by each relay in the battery pack assembly 200 can be clearly understood, so as to facilitate the determination of the relays with excessive noise. For example, if the overall noise test result indicates that the overall noise does not exceed the standard, that is, the overall noise decibel is within the required range, the noise test is terminated. It is understandable that the essential difference between the overall noise test and the individual noise test is that the number of relays that are simultaneously energized or released is different, and the noise level generated is different. Since there is a superposition effect when they are energized or released at the same time, the noise and vibration levels during the overall noise test will be more obvious than when a single relay is energized and released during the individual noise test. Exemplarily, a high-voltage box is provided in the battery pack assembly 200, and the relay is provided in the high-voltage box. After determining the relay with excessive noise, noise reduction materials can be provided on the surface of the high-voltage box directly above the relay with excessive noise, for example, a certain thickness of melamine foam is added, or a rubber pad is used to cushion the hardness to achieve a shock-absorbing and noise-reducing effect. In one example, the noise requirement range is less than 52dB(A).

[0056] In the present disclosure, the control system 106 may be an electronic device, that is, the relay of the battery pack assembly 200 is controlled by an electronic device to be closed and released, and a noise test result is generated according to the collected sound pressure signal and vibration signal, such as Figure 1As shown; or, the control system may be two electronic devices, for example, the control system may include a host computer and a signal processing device, and then the host computer controls the pull-in and release of the relay of the battery pack assembly, and the signal processing device generates a noise test result according to the collected sound pressure signal and vibration signal. The present disclosure does not limit the number of control systems. Among them, the electronic device, the host computer and the signal processing device include but are not limited to mobile phones, tablet computers, laptop computers, personal computers, wearable devices, ATMs, etc. Post-processing software may be installed on the signal processing device, so as to facilitate post-processing of the sound pressure signal and vibration signal collected during the noise test to obtain the noise test result. The post-processing can process the sound pressure signal and vibration signal (such as frequency, order, sound intensity, etc.) collected by the sound pressure signal acquisition device 102 and the vibration signal acquisition device 104 into a noise signal, and the noise signal can represent the noise decibel at different times. Exemplarily, the sound pressure signal acquisition device 102 and the vibration signal acquisition device 104 can transmit the collected digital signal to the data acquisition instrument, and then the data acquisition instrument transmits the digital signal to the signal processing device via Ethernet.

[0057] The control system 106 controls the closure and release of all relays of the battery pack assembly 200, including: the control system 106 controls the battery pack assembly 200 to execute the power-on logic, wherein the power-on logic is the control logic of multiple relays during the power-on process of the battery pack assembly 200; the control system 106 controls the battery pack assembly 200 to execute the power-off logic after the first interval, wherein the power-off logic is the control logic of multiple relays during the power-off process of the battery pack assembly 200; and the control system 106 enters the control battery pack assembly 200 to execute the power-on logic step after the second interval to perform multiple cycles of the power-on and power-off operations of the battery pack assembly 200. In this way, multiple groups of effective sound pressure signals and vibration signals can be collected during the overall noise test. Exemplarily, the control system 106 is connected to the battery management system in the battery pack assembly 200 through a low-voltage wiring harness, and then the control system 106 controls the battery pack assembly 200 to execute the power-on logic and the power-off logic through the battery management system. One power-on and power-off operation of the battery pack assembly 200 includes executing one power-on logic and one power-off logic. In one example, the power-on and power-off logics are executed 6 times respectively, that is, the battery pack assembly 200 is powered on and off 6 times in total during the overall noise test process, and the first duration and the second duration are 5s respectively, thereby reserving sufficient time to eliminate the influence of the signal generated when the power-on logic or the power-off logic is executed first on the signal generated when the power-off logic or the power-on logic is executed later, so that the peak value of the signal before the power-off logic and the power-on logic are executed later can return to the zero point, thereby ensuring that the sound pressure signal and the vibration signal can be accurately collected after the power-off logic and the power-on logic are executed later.

[0058] The control system 106 controls the relays of the battery pack assembly 200 to be closed and released one by one to generate individual noise test results one by one, including: the control system 106 selects a relay from all relays; the control system 106 controls the selected relay to be closed and released; and the control system 106 generates the individual noise test results of the selected relay according to the sound pressure signal and vibration signal when the selected relay is closed and released, and enters the step of selecting a relay from all relays to perform individual noise tests in a loop until the individual noise test results of all relays are obtained. In this way, each relay in the battery pack assembly 200 is individually tested for individual noise, and the individual noise test results of each relay are obtained, so as to facilitate understanding of the noise generated by each relay. Exemplarily, the control system 106 is connected to the battery management system in the battery pack assembly 200 through a low-voltage wiring harness, and then the control system 106 controls the selected relay to be closed and released through the battery management system. The control system 106 controls the selected relay to be attracted and released, including: controlling the selected relay to be attracted; after the interval of the third time length, controlling the selected relay to be released; and after the interval of the fourth time length, entering the control selected relay attraction step to perform multiple cycles of relay attraction and release operations. In this way, multiple groups of effective sound pressure signals and vibration signals can be collected during the individual noise test process. A relay attraction and release operation includes a relay attraction and a relay release. In an example, each relay attraction and release are performed 6 times respectively, that is, 6 relay attraction and release operations are performed during the individual noise test of each relay, and the third time length and the fourth time length are 5s respectively, thereby reserving enough time to facilitate the elimination of the influence of the signal generated when the previous attraction or release is performed on the signal generated when the subsequent release or attraction is performed, so that the peak value of the signal before the subsequent release and attraction can return to zero, thereby ensuring that the sound pressure signal and vibration signal can be accurately collected after the subsequent release and attraction. Exemplarily, the first time length, the second time length, the third time length and the fourth time length are respectively greater than or equal to 3s.

[0059] The DC power supply 110 is used to supply power to the battery pack assembly 200 during the noise test, thereby ensuring the normal operation of the relays in the battery pack assembly 200. In one example, the DC power supply 110 can provide a working voltage between 12V and 14V to the relays in the battery pack assembly 200.

[0060] The elastic device 108 is used to support the battery pack assembly 200 horizontally in the air during the noise test. It is understandable that if the battery pack assembly 200 is placed directly on the ground or on a workbench, the lower surface of the battery pack assembly 200 will directly contact the ground or the workbench, which will increase the stiffness of the battery pack assembly 200, thereby affecting the vibration performance of the battery pack assembly 200, causing a large deviation between the vibration signal collected during the test and the vibration signal under the actual vehicle working condition, affecting the accuracy of the noise test results. Therefore, during the noise test, the battery pack assembly 200 cannot be placed directly on the ground or on a workbench, and the battery pack assembly 200 needs to be supported horizontally in the air by the elastic device 108. During the noise test, the distance between the lower surface of the battery pack assembly 200 and the ground is 30 cm to 50 cm, that is, the distance between the lower surface of the battery pack assembly 200 and the ground (i.e., the ground clearance) can be 30 cm, 35 cm, 40 cm, 45 cm, 50 cm, or any other value between 30 cm and 50 cm. In this way, the ground clearance of the battery pack assembly 200 during the noise test is close to the ground clearance of the battery pack assembly 200 when installed on the vehicle, so that the actual vehicle working environment can be simulated, which is conducive to improving the accuracy of the collected sound pressure signal and vibration signal. In one example, during the noise test, the distance between the lower surface of the battery pack assembly 200 and the ground is 40 cm. In this way, the ground clearance of the battery pack assembly 200 during the noise test is the same as the ground clearance of the battery pack assembly 200 when installed on the vehicle, so that the actual vehicle working environment can be better simulated, which is conducive to further improving the accuracy of the collected sound pressure signal and vibration signal. In one example, the elastic device 108 is an air spring, and the height of the air spring can be freely adjusted to ensure that a proper distance is maintained between the lower surface of the battery pack assembly 200 and the ground.

[0061] The sound absorbing device 112 is arranged on the ground directly below the sound pressure signal collecting device 102. The sound absorbing device 112 is used to absorb the noise reflected from the ground, so as to avoid the noise reflected from the ground interfering with the collected sound pressure signal, making the collected sound pressure signal more real and accurate, and improving the accuracy of the noise test result. The length of the sound absorbing device 112 can be 100 cm, the width can be 100 cm, and the thickness can be greater than or equal to 2 cm, so that the sound absorbing device 112 can effectively absorb the noise reflected from the ground. Exemplarily, the projection of the sound pressure signal collecting device 102 in the vertical direction is at the center of the attraction device, so that the sound absorbing device 112 can effectively absorb the noise reflected from the ground. In one example, the attraction device is a square sound-absorbing cotton.

[0062] The noise test system 100 can be set in a semi-anechoic chamber, so as to improve the accuracy of the noise test results. For example, during the noise test in the semi-anechoic chamber, the ambient noise needs to be more than 20dB lower than the measured noise, and the indoor temperature is maintained at 15-25°C, so as to standardize the noise test standards and help improve the accuracy of the noise test results.

[0063] It should be noted that the specific numerical values ​​mentioned above are only used as examples to illustrate the implementation of the present disclosure in detail, and should not be understood as limiting the present disclosure. In other examples or implementations or embodiments, other numerical values ​​can be selected according to the present disclosure, and are not specifically limited here.

[0064] In one example, the control system controls the battery pack assembly to perform six battery pack assembly power-on and power-off operations, thereby obtaining the following: Figure 5 The noise signal waveform diagram is shown, where the red circle is the noise signal waveform obtained during the power-on logic execution, and the black circle is the noise signal waveform obtained during the power-off logic execution. The noise signal waveform diagram can be determined that the maximum overall noise occurs in the power-off stage, and is 52.79dB(A), which exceeds the upper limit of the required range of 52dB(A), that is, the overall noise exceeds the standard. Next, individual noise tests are performed on the main positive relay, main negative relay, charging positive relay, charging negative relay, pre-charging relay and boost relay inside the battery pack assembly one by one. During the individual noise test of each relay, 6 relay pull-in and release operations are performed, and the noise values ​​obtained are shown in Table 1.

[0065] Table 1

[0066]

[0067]

[0068] It can be seen from Table 1 that the relays with excessive noise are the positive charging relay and the negative charging relay, so the area directly above the positive charging relay and the negative charging relay can be improved and optimized to reduce the noise. In summary, the noise test system provided by this embodiment can effectively discover and detect the NVH noise level of the internal relay of the battery pack assembly. Compared with the use of a handheld noise tester and manual judgment, the present disclosure can improve the accuracy and convenience of noise testing.

[0069] According to a further embodiment of the present disclosure, a noise testing system is also provided, including: a sound pressure signal acquisition device, used to acquire the sound pressure signal when the relay of the battery pack assembly is energized and released; a vibration signal acquisition device, used to acquire the vibration signal when the relay of the battery pack assembly is energized and released; and a control system, used to control the energization and release of the relay of the battery pack assembly, and generate a noise test result according to the acquired sound pressure signal and vibration signal, wherein, in the process of generating the noise test result, the control system first controls all the relays of the battery pack assembly to energize and release to generate an overall noise test result, and when the overall noise test result indicates that the overall noise exceeds the standard, the relays of the battery pack assembly are controlled to energize and release one by one to generate individual noise test results one by one, so as to determine the relays whose noise exceeds the standard.

[0070] In some embodiments, controlling all relays of a battery pack assembly to be attracted and released includes: controlling the battery pack assembly to execute power-on logic, wherein the power-on logic is the control logic for multiple relays during the power-on process of the battery pack assembly; after an interval of a first time length, controlling the battery pack assembly to execute power-off logic, wherein the power-off logic is the control logic for multiple relays during the power-off process of the battery pack assembly; and after an interval of a second time length, entering the step of controlling the battery pack assembly to execute the power-on logic to perform multiple cycles of power-on and power-off operations of the battery pack assembly.

[0071] In some embodiments, the relays of the battery pack assembly are controlled to be attracted and released one by one to generate individual noise test results one by one, including: selecting a relay from all relays; controlling the selected relay to be attracted and released; and generating the individual noise test results of the selected relay according to the sound pressure signal and vibration signal when the selected relay is attracted and released, and entering the step of selecting a relay from all relays to cyclically perform individual noise tests until the individual noise test results of all relays are obtained. As a further embodiment, controlling the selected relay to be attracted and released includes: controlling the selected relay to be attracted; after an interval of a third time length, controlling the selected relay to be released; and after an interval of a fourth time length, entering the step of controlling the selected relay to be attracted to perform multiple cycles of relay attraction and release operations.

[0072] The sound pressure signal collection device is arranged outside the battery pack assembly and near the opening of the battery pack assembly. There are multiple sound pressure signal collection devices, and they are arranged at different positions near the opening. There are 3 sound pressure signal collection devices, which are arranged in front of, above and on the left side of the opening respectively. The distance between the sound pressure signal collection device and the opening is 100cm to 120cm.

[0073] The vibration signal acquisition device is arranged on the outer surface of the battery pack assembly and is located near the opening of the battery pack assembly. There are multiple vibration signal acquisition devices, and they are arranged on different outer surfaces of the battery pack assembly. There are three vibration signal acquisition devices, which are respectively arranged on the second side surface, the third side surface and the upper surface connected to the first side surface where the opening is located. The vibration signal acquisition device is arranged on the outer surface at the position closest to the opening.

[0074] The noise testing system may further include a DC power supply for supplying power to the battery pack assembly during the noise testing process.

[0075] The noise test system may further include an elastic device for supporting the battery pack assembly horizontally in the air during the noise test. During the noise test, the distance between the lower surface of the battery pack assembly and the ground is 30 cm to 50 cm.

[0076] The noise test system may also include a sound absorbing device, which is arranged on the ground directly below the sound pressure signal acquisition device, and is used to absorb the noise reflected from the ground. The length of the sound absorbing device is 100 cm, the width is 100 cm, and the thickness is greater than or equal to 2 cm.

[0077] The noise test system can be set up in a semi-anechoic chamber.

[0078] For the contents related to the noise test system, please refer to the above description, which will not be repeated here for the sake of brevity.

[0079] According to a further embodiment of the present disclosure, a noise testing method is also provided. Figure 2 The noise test system shown is implemented in Figure 6 FIG. 1 shows a flow chart of a noise testing method according to the present disclosure. Figure 6 As shown, the noise testing method M600 may include step S610, step S620, step S630 and step S640.

[0080] S610: Controls the closing and releasing of all relays of the battery pack assembly.

[0081] S620: Collect the sound pressure signals and vibration signals generated when all relays are closed and released.

[0082] S630: Generate an overall noise test result based on the sound pressure signals and vibration signals generated when all relays are closed and released.

[0083] S640: When the overall noise test result indicates that the overall noise exceeds the standard, the relays of the battery pack assembly are controlled to be attracted and released one by one to generate individual noise test results one by one to determine the relays whose noise exceeds the standard.

[0084] Please combine Figure 7 In some embodiments, step S610 may include the following battery pack assembly power-on and power-off operations: S611, control the battery pack assembly to execute the power-on logic. The power-on logic is the control logic of multiple relays during the battery pack assembly power-on process; S612, after a first time interval, control the battery pack assembly to execute the power-off logic. The power-off logic is the control logic of multiple relays during the battery pack assembly power-off process; and S613, after a second time interval, enter the step of controlling the battery pack assembly to execute the power-on logic for multiple cycles.

[0085] Please combine Figure 8 In some embodiments, step S640 may include: S641, selecting a relay from all relays; S642, controlling the selected relay to be attracted and released; and S643, generating an individual noise test result of the selected relay according to the sound pressure signal and vibration signal when the selected relay is attracted and released, and entering the step of selecting a relay from all relays to perform individual noise tests in a loop until the individual noise test results of all relays are obtained. Please combine Fig. 9 As a further implementation, step S642 may include the following relay closing and releasing operations: S6421, controlling the selected relay to close; S6422, after an interval of a third time length, controlling the selected relay to release; and S6423, after an interval of a fourth time length, entering the step of controlling the selected relay to close for multiple cycles.

[0086] For details about the noise testing method, please refer to the above description, which will not be repeated here for the sake of brevity.

[0087] The present disclosure also provides a computer program product. The method of the present disclosure can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed, the process or function of the present disclosure is executed in whole or in part.

[0088] The computer program or instructions may be stored in a readable storage medium or transmitted from one readable storage medium to another readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired or wireless means. The readable storage medium may be any available medium that can be accessed or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; it may also be a semiconductor medium, such as a solid state drive. The computer readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0089] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0090] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the present disclosure. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0091] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0092] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0093] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments / methods or examples described in this specification and features of different embodiments / methods or examples, unless they are contradictory.

[0094] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0095] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0096] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A noise testing system, characterized in that: include: A sound pressure signal acquisition device, used to collect the sound pressure signal when the relay of the battery pack assembly is pulled in and released; A vibration signal acquisition device, used to acquire vibration signals when the relay of the battery pack assembly is closed and released; as well as A control system is used to control the closure and release of the relays of the battery pack assembly, and generate a noise test result based on the collected sound pressure signal and vibration signal, wherein, in the process of generating the noise test result, the control system first controls all the relays of the battery pack assembly to be closure and release to generate an overall noise test result, and when the overall noise test result indicates that the overall noise exceeds the standard, the control system controls the closure and release of the relays of the battery pack assembly one by one to generate individual noise test results one by one, so as to determine the relays with excessive noise.

2. The noise testing system according to claim 1, characterized in that: Controlling the closing and releasing of all relays of the battery pack assembly, including: Controlling the battery pack assembly to execute power-on logic, wherein the power-on logic is a control logic for the plurality of relays during the power-on process of the battery pack assembly; After a first time interval, controlling the battery pack assembly to execute a power-off logic, wherein the power-off logic is a control logic for the plurality of relays during the power-off process of the battery pack assembly; and After an interval of a second time period, the battery pack assembly is controlled to execute a power-on logic step to perform multiple cycles of power-on and power-off operations of the battery pack assembly.

3. The noise testing system according to claim 1, characterized in that: The relays of the battery pack assembly are controlled to be closed and released one by one to generate individual noise test results one by one, including: Selecting a relay from all the relays; Controls the closure and release of selected relays; and The individual noise test result of the selected relay is generated according to the sound pressure signal and the vibration signal when the selected relay is energized and released, and the step of selecting one relay from all the relays is entered to perform the individual noise test in a loop until the individual noise test results of all the relays are obtained.

4. The noise testing system according to claim 3, characterized in that: The control selected relay closure and release includes: Controlling the selected relay to be energized; After a third time interval, controlling the selected relay to release; and After a fourth time interval, the step of controlling the selected relay to close is entered to perform multiple cycles of relay closing and releasing operations.

5. The noise testing system according to claim 1, characterized in that: The sound pressure signal collecting device is arranged outside the battery pack assembly and is located near the opening of the battery pack assembly.

6. The noise testing system according to claim 5, characterized in that: There are multiple sound pressure signal collecting devices, which are arranged at different positions near the opening.

7. The noise testing system according to claim 6, characterized in that: The number of the sound pressure signal collecting devices is three, which are respectively arranged in front of, above and on the left side of the opening.

8. The noise testing system according to any one of claims 5 to 7, characterized in that: The distance between the sound pressure signal collecting device and the opening is 100 cm to 120 cm.

9. The noise testing system according to claim 1, characterized in that: The vibration signal collecting device is arranged on the outer surface of the battery pack assembly and is located near the opening of the battery pack assembly.

10. The noise testing system according to claim 9, characterized in that: There are multiple vibration signal collecting devices, which are arranged on different outer surfaces of the battery pack assembly.

11. The noise testing system according to claim 10, characterized in that: The number of the vibration signal collecting devices is three, which are respectively arranged on the second side surface, the third side surface and the upper surface connected to the first side surface where the opening is located.

12. The noise testing system according to claim 10, characterized in that: The vibration signal collecting device is arranged on the outer surface at a position closest to the opening.

13. The noise testing system according to claim 1, characterized in that: It also includes a DC power supply, which is used to supply power to the battery pack assembly during the noise test.

14. The noise testing system according to claim 1, characterized in that: It also includes an elastic device, which is used to support the battery pack assembly horizontally in the air during the noise test.

15. The noise testing system according to claim 14, characterized in that: During the noise test, the distance between the lower surface of the battery pack assembly and the ground is 30 cm to 50 cm.

16. The noise testing system according to claim 14, characterized in that: It also includes a sound absorbing device, which is arranged on the ground directly below the sound pressure signal collecting device and is used to absorb noise reflected from the ground.

17. The noise testing system according to claim 16, characterized in that: The sound absorbing device has a length of 100 cm, a width of 100 cm, and a thickness greater than or equal to 2 cm.

18. The noise testing system according to claim 1, characterized in that: The noise testing system is arranged in a semi-anechoic chamber.

19. A noise testing method, characterized in that: include: Control the closing and releasing of all relays of the battery pack assembly; Collecting sound pressure signals and vibration signals generated when all relays are closed and released; Generate an overall noise test result based on the sound pressure signals and vibration signals generated when all the relays are closed and released; as well as When the overall noise test result indicates that the overall noise exceeds the standard, the relays of the battery pack assembly are controlled to be closed and released one by one to generate individual noise test results one by one, so as to determine the relays with excessive noise.

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