Method for determining life of power distribution device, determining device and vehicle

Abstract

The present application provides a method for determining the life of a power distribution device, a determination device and a vehicle, the method comprising: obtaining the total working time of the power distribution device under actual working conditions, multiple test temperatures and multiple working time percentages, the working time percentage corresponds to the test temperature one-to-one, and the working time percentage is the ratio of the working time of the power distribution device at the corresponding test temperature to the total working time; multiple acceleration factors are calculated based on the test temperature and activation energy parameters, the acceleration factors correspond to the test temperature one-to-one, the activation energy parameter is the activation energy corresponding to the coolant failure mode, and the coolant failure mode is the mode in which the coolant fails to dissipate heat for the power distribution device; based on the total working time, all working time percentages and corresponding acceleration factors, the test life of the power distribution device under actual working conditions is calculated. This method solves the problem of low accuracy of the life of the power distribution device measured by the high-temperature endurance test based on the ambient temperature in the prior art.

Description

Technical Field

[0001] The present application relates to the field of life testing of electronic and electrical components, and in particular, to a method for determining the life of a power distribution device, a determining device, a computer-readable storage medium, a processor, and a vehicle. Background Art

[0002] The three-in-one power distribution device is a key component of electric vehicles. Its durability directly affects the working performance, safety and cost of electric vehicles. The traditional high-temperature durability test can only calculate the acceleration factor of a single power distribution device, on-board charger, DCDC and PDU under different working conditions according to the ambient temperature, which cannot meet the acceleration factor calculation of the actual working conditions of the existing three-in-one power distribution device.

[0003] In the actual use of electric vehicles, the main failure mode of the three-in-one distribution device is the heat dissipation of the IGBT module by the water channel, which is not stimulated by simple high-temperature stress. Therefore, when conducting life tests according to the traditional high-temperature durability test method, considering that the PCBA is not directly dissipated by the water channel, but relies on internal air convection or structural conduction to dissipate heat, the ambient temperature is used to calculate the acceleration factor, and the life of the three-in-one distribution device deviates from the actual value. A higher value will increase the cost and extend the test cycle, while a lower value will affect the reliability of the entire vehicle and mislead the positive progress of R&D work.

[0004] From the above, it can be seen that the existing technology lacks a testing method for the life of a three-in-one distribution device that can cover the life test of the actual integrated distribution assembly of electric vehicles under different working conditions, is compatible with a variety of tested products, and covers a variety of working modes.

[0005] The above information disclosed in the background technology section is only used to enhance the understanding of the background technology of the technology described in this article. Therefore, the background technology may contain certain information that does not form the prior art known in this country for those skilled in the art. Summary of the invention

[0006] The main purpose of the present application is to provide a method for determining the life of a distribution device, a determination device, a computer-readable storage medium, a processor and a vehicle to solve the problem of low accuracy of the life of the distribution device measured by a high-temperature durability test based on ambient temperature in the prior art.

[0007] According to one aspect of an embodiment of the present invention, a method for determining the life of a distribution device is provided, the method comprising: obtaining the total working time of the distribution device under actual working conditions, multiple test temperatures and multiple working time percentages, the working time percentages corresponding to the test temperatures one-to-one, the working time percentages being the ratio of the working time of the distribution device at the corresponding test temperature to the total working time, the test temperature being the temperature of the coolant of the distribution device; calculating multiple acceleration factors according to the test temperatures and activation energy parameters, the acceleration factors corresponding to the test temperatures one-to-one, the activation energy parameters being the activation energy corresponding to a coolant failure mode, the coolant failure mode being a mode in which the coolant fails to dissipate heat for the distribution device; calculating the test life of the distribution device under the actual working conditions according to the total working time, all the working time percentages and the corresponding acceleration factors.

[0008] Optionally, the power distribution device is a power distribution device of a vehicle, and the actual operating conditions include charging conditions, driving conditions and inverter conditions. The charging conditions are the working states of the power distribution device when the vehicle is charging, the driving conditions are the working states of the power distribution device when the vehicle is driving, and the inverter conditions are the working states of the power distribution device when the power distribution device performs DC inverter.

[0009] Optionally, before obtaining the total working time of the power distribution device under actual working conditions, multiple test temperatures and multiple working time percentages, the method also includes: obtaining multiple operating parameters of the power distribution device under the actual working conditions; calculating the working time of the power distribution device under the actual working conditions based on the multiple operating parameters to obtain the total working time.

[0010] Optionally, multiple acceleration factors are calculated based on the test temperature and the activation energy parameter, including: obtaining the maximum value among the test temperatures to obtain the maximum test temperature; according to the maximum test temperature, each preliminary test temperature and the activation energy parameter, multiple acceleration factors are calculated using the Arrhenius formula, and the acceleration factors correspond one-to-one to the preliminary test temperatures, and the preliminary test temperature is any one of the test temperatures.

[0011] Optionally, before calculating a plurality of acceleration factors according to the test temperature and the activation energy parameter, the method further comprises: acquiring the activation energy parameter according to the coolant failure mode.

[0012] Optionally, the test life of the power distribution device under the actual working conditions is calculated based on the total working time, all the working time percentages and the corresponding acceleration factors, including: calculating the ratio of each working time percentage to the corresponding acceleration factor to obtain multiple ratios; calculating the sum of all the ratios to obtain the acceleration coefficient; calculating the product of the total working time and the acceleration coefficient to obtain the test life of the power distribution device under the actual working conditions.

[0013] According to another aspect of an embodiment of the present invention, a device for determining the life of a distribution device is also provided, the device comprising: an acquisition unit, for acquiring the total working time of the distribution device under actual working conditions, multiple test temperatures and multiple working time percentages, the working time percentage corresponding to the test temperature one-to-one, the working time percentage being the ratio of the working time of the distribution device at the corresponding test temperature to the total working time, the test temperature being the temperature of the coolant of the distribution device; a first calculation unit, for calculating multiple acceleration factors according to the test temperature and an activation energy parameter, the acceleration factors corresponding to the test temperature one-to-one, the activation energy parameter being the activation energy corresponding to a coolant failure mode, the coolant failure mode being a mode in which the coolant fails in its heat dissipation function for the distribution device; a second calculation unit, for calculating the test life of the distribution device under the actual working conditions according to the total working time, all the working time percentages and the corresponding acceleration factors.

[0014] According to yet another aspect of the embodiments of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein the program executes any one of the methods described.

[0015] According to yet another aspect of an embodiment of the present invention, a processor is provided, wherein the processor is used to run a program, wherein any one of the methods is executed when the program is run.

[0016] According to one aspect of an embodiment of the present invention, a vehicle is also provided, comprising: a device for determining the life of a distribution device, one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the described methods.

[0017] In an embodiment of the present invention, in the method for determining the life of the above-mentioned distribution device, first, the total working time of the above-mentioned distribution device under actual working conditions, multiple test temperatures and multiple working time percentages are obtained, the above-mentioned working time percentages correspond to the above-mentioned test temperatures one-to-one, the above-mentioned working time percentages are the ratio of the working time of the above-mentioned distribution device at the corresponding above-mentioned test temperature to the above-mentioned total working time, and the above-mentioned test temperature is the temperature of the coolant of the above-mentioned distribution device; then, multiple acceleration factors are calculated according to the above-mentioned test temperatures and activation energy parameters, the above-mentioned acceleration factors correspond to the above-mentioned test temperatures one-to-one, the above-mentioned activation energy parameters are the activation energy corresponding to the coolant failure mode, and the above-mentioned coolant failure mode is the mode in which the above-mentioned coolant fails in the heat dissipation function of the above-mentioned distribution device; finally, according to the above-mentioned total working time, all the above-mentioned working time percentages and the corresponding above-mentioned acceleration factors, the test life of the above-mentioned distribution device under the above-mentioned actual working conditions is calculated. The method obtains multiple working time percentages to obtain the proportion of the working time of the distribution device at various coolant temperatures in the total working time under actual working conditions, calculates various acceleration factors according to the test temperature and activation energy parameters, obtains the acceleration factors at various coolant temperatures under actual working conditions, calculates the test life of the distribution device under actual working conditions according to the working time percentages and corresponding acceleration factors corresponding to various coolant temperatures under actual working conditions, and makes the obtained test life of the three-in-one distribution device more in line with reality. This method solves the problem of low accuracy of the life of the distribution device measured by the high-temperature endurance test based on ambient temperature in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 A flow chart showing a method for determining the life of a power distribution device according to an embodiment of the present application is shown;

[0020] Figure 2 A schematic diagram of a device for determining the life of a power distribution device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.

[0025] As mentioned in the background technology, the life of the distribution device measured by the high-temperature durability test based on ambient temperature in the prior art has low accuracy. In order to solve the above problem, in a typical embodiment of the present application, a method for determining the life of a distribution device, a determination device, a computer-readable storage medium, a processor and a vehicle are provided.

[0026] According to an embodiment of the present application, a method for determining the life of a power distribution device is provided.

[0027] Figure 1 FIG. 1 is a flow chart of a method for determining the life of a power distribution device according to an embodiment of the present application. Figure 1 As shown, the method comprises the following steps:

[0028] Step S101, obtaining the total working time, multiple test temperatures and multiple working time percentages of the above-mentioned power distribution device under actual working conditions, wherein the above-mentioned working time percentages correspond to the above-mentioned test temperatures one by one, and the above-mentioned working time percentages are the ratios of the working time of the above-mentioned power distribution device at the corresponding above-mentioned test temperatures to the above-mentioned total working time, and the above-mentioned test temperature is the temperature of the coolant of the above-mentioned power distribution device;

[0029] Step S102, a plurality of acceleration factors are calculated according to the test temperature and the activation energy parameter, wherein the acceleration factors correspond to the test temperature one by one, the activation energy parameter is the activation energy corresponding to the coolant failure mode, and the coolant failure mode is the mode in which the coolant fails to dissipate heat for the power distribution device;

[0030] Step S103, calculating the test life of the power distribution device under the actual working conditions according to the total working time, all the percentages of the working time and the corresponding acceleration factors.

[0031] In the method for determining the life of the above-mentioned distribution device, first, the total working time, multiple test temperatures and multiple working time percentages of the above-mentioned distribution device under actual working conditions are obtained, the above-mentioned working time percentages correspond to the above-mentioned test temperatures one-to-one, the above-mentioned working time percentages are the ratio of the working time of the above-mentioned distribution device at the corresponding above-mentioned test temperature to the above-mentioned total working time, and the above-mentioned test temperature is the temperature of the coolant of the above-mentioned distribution device; then, multiple acceleration factors are calculated according to the above-mentioned test temperatures and activation energy parameters, the above-mentioned acceleration factors correspond to the above-mentioned test temperatures one-to-one, the above-mentioned activation energy parameters are the activation energy corresponding to the coolant failure mode, and the above-mentioned coolant failure mode is the mode in which the above-mentioned coolant fails in the heat dissipation function of the above-mentioned distribution device; finally, according to the above-mentioned total working time, all the above-mentioned working time percentages and the corresponding above-mentioned acceleration factors, the test life of the above-mentioned distribution device under the above-mentioned actual working conditions is calculated. The method obtains multiple working time percentages to obtain the proportion of the working time of the distribution device at various coolant temperatures in the total working time under actual working conditions, calculates various acceleration factors according to the test temperature and activation energy parameters, obtains the acceleration factors at various coolant temperatures under actual working conditions, calculates the test life of the distribution device under actual working conditions according to the working time percentages and corresponding acceleration factors corresponding to various coolant temperatures under actual working conditions, and makes the obtained test life of the three-in-one distribution device more in line with reality. This method solves the problem of low accuracy of the life of the distribution device measured by the high-temperature endurance test based on ambient temperature in the prior art.

[0032] It should be noted that the above-mentioned power distribution device is a three-in-one power distribution device, which includes an on-board charger, DCDC and PDU.

[0033] It should also be noted that when the traditional high-temperature durability test method is used to test the life of a three-in-one power distribution device, only a single power distribution device can be tested. The single power distribution device is any one of the on-board charger, DCDC and PDU. The present application realizes the life test of the three-in-one power distribution device, and the present application integrates the test life of the three-in-one power distribution device under multiple actual working conditions, and takes into account the influence of various actual working conditions on the test life of the three-in-one power distribution device. The present application solves the problem of single test products and test modes in the prior art, and solves the problem that the influence of various actual working conditions on the test life of the three-in-one power distribution device cannot be comprehensively considered when conducting the life test of the three-in-one power distribution device in the prior art. The present application is compatible with a variety of tested products and covers a variety of actual working conditions, which is conducive to large-scale promotion.

[0034] It should also be noted that when the traditional high-temperature durability test method is used to test the life of a three-in-one power distribution device, it is considered that the three-in-one power distribution device is not directly cooled by the coolant, but is cooled by internal air convection or conduction of structural parts. The traditional high-temperature durability test method calculates the acceleration factor according to various ambient temperatures, and the test life of the three-in-one power distribution device obtained deviates from the actual test life. A higher test life of the three-in-one power distribution device will increase the cost and extend the test cycle. A lower test life of the three-in-one power distribution device will affect the reliability of the vehicle and mislead the positive progress of research and development work. This application takes into account the three-in-one power distribution device in actual applications. The main failure mode of the device is the failure mode of the cooling function of the IGBT module of the three-in-one distribution device caused by the coolant, which is not stimulated by simple high-temperature stress. That is, the influence of the failure of the cooling function of the IGBT module of the three-in-one distribution device caused by the coolant on the life of the three-in-one distribution device in actual conditions is taken into account. Therefore, when determining the activation energy parameters, the activation energy corresponding to the coolant failure mode is selected, and the test life of the three-in-one distribution device under actual working conditions is calculated according to the working time percentages and corresponding acceleration factors corresponding to various coolant temperatures under actual working conditions, so that the measured test life of the three-in-one distribution device is more in line with reality.

[0035] It should also be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described may be executed in an order different from that shown here.

[0036] In one embodiment of the present application, the power distribution device is a power distribution device of a vehicle, and the actual working conditions include charging conditions, driving conditions, and inverter conditions. The charging conditions are the working conditions of the power distribution device when the vehicle is charging, the driving conditions are the working conditions of the power distribution device when the vehicle is driving, and the inverter conditions are the working conditions of the power distribution device when the power distribution device performs DC inverter. In this embodiment, the test life of the three-in-one power distribution device under charging conditions, the test life of the three-in-one power distribution device under driving conditions, and the test life of the three-in-one power distribution device under inverter conditions are tested respectively, which solves the problem in the prior art that when testing the life of the three-in-one power distribution device, the influence of various actual working conditions on the test life of the three-in-one power distribution device cannot be comprehensively considered, so that the method for determining the life of the three-in-one power distribution device of the present application can be compatible with a variety of tested products and can cover a variety of actual working conditions, which is conducive to large-scale promotion.

[0037] It should be noted that the above-mentioned vehicles are electric vehicles.

[0038] In one embodiment of the present application, before obtaining the total working time, multiple test temperatures and multiple working time percentages of the above-mentioned power distribution device under actual working conditions, the above-mentioned method further includes: obtaining multiple operating parameters of the above-mentioned power distribution device under the above-mentioned actual working conditions; calculating the working time of the above-mentioned power distribution device under the above-mentioned actual working conditions according to the multiple above-mentioned operating parameters to obtain the above-mentioned total working time. In this embodiment, the total mileage D within the design life of the three-in-one power distribution device is obtained. life , kilometers per kWhD 1kWh , the total power P of the three-in-one power distribution device is calculated by the formula Calculate the total working time t of the three-in-one power distribution device under charging conditions charge , obtain the total mileage D of the three-in-one power distribution device within its design life life , average speed of passenger cars V average , through the formula Calculate the total working time t of the three-in-one power distribution device under driving conditions drive The total working time of the three-in-one power distribution device under the inverter condition is the custom value t inversion .

[0039] In one embodiment of the present application, multiple acceleration factors are calculated based on the above test temperatures and activation energy parameters, including: obtaining the maximum value of the above test temperatures to obtain the highest test temperature; using the Arrhenius formula to calculate the above acceleration factors based on the above highest test temperature, each preliminary test temperature and the above activation energy parameter, the above acceleration factors correspond to the above preliminary test temperature one by one, and the above preliminary test temperature is any one of the above test temperatures. In this embodiment, when the actual working condition is the charging working condition, the maximum value of the test temperature under the actual working condition is obtained, that is, the various coolant temperatures T under the charging working condition are obtained. field.i The maximum value among them gives the highest test temperature T text1.max , according to the maximum test temperature T text1.max , various coolant temperatures T under charging conditions field.i and activation energy parameter E A , using the Arrhenius formula The acceleration factor A at various coolant temperatures under charging conditions is calculated T,i When the actual working condition is the driving condition, the maximum value of the test temperature under the actual working condition is obtained, that is, the various coolant temperatures T under the driving condition are obtained. field.j The maximum value among them gives the highest test temperature T text2.max , according to the maximum test temperature T text2.max , various coolant temperatures T under driving conditions field.j and activation energy parameter E A , using the Arrhenius formula Calculate the acceleration factor A at various coolant temperatures under driving conditions T,j When the actual working condition is the inverter working condition, obtain the maximum value of the test temperature under the actual working condition, that is, obtain the various coolant temperatures T under the inverter working condition. field.s The maximum value among them gives the highest test temperature T text3.max , according to the maximum test temperature T text3.max , various coolant temperatures T under inverter conditions field.s and activation energy parameter E A , using the Arrhenius formula The acceleration factor A at various coolant temperatures under inverter conditions is calculated T,s .

[0040] In one embodiment of the present application, before calculating multiple acceleration factors according to the test temperature and activation energy parameters and calculating the test life of the above-mentioned power distribution device under the above-mentioned actual working conditions, the above-mentioned method also includes: obtaining the above-mentioned activation energy parameters according to the above-mentioned coolant failure mode. In this embodiment, before calculating each acceleration factor, the activation energy corresponding to the coolant failure mode is obtained to obtain the activation energy parameter EA. The coolant failure mode takes into account the failure of the IGBT module function caused by the failure of the heat dissipation function of the IGBT module in the three-in-one power distribution device of the coolant in the actual use of the electric vehicle, that is, the influence of the coolant temperature on the life of the three-in-one power distribution device in the actual use of the electric vehicle is taken into account. Compared with the prior art that considers the influence of the ambient temperature on the life of the three-in-one power distribution device, the acceleration factors at various coolant temperatures calculated by the activation energy corresponding to the coolant failure mode in the present application are more in line with the actual situation, thereby making the measured test life of the three-in-one power distribution device more in line with the actual situation and more accurate.

[0041] In one embodiment of the present application, according to the total working time, all the percentages of the working time and the corresponding acceleration factors, it includes: calculating the ratio of each percentage of the working time to the corresponding acceleration factor to obtain multiple ratios; calculating the sum of all the ratios to obtain the acceleration coefficient; calculating the product of the total working time and the acceleration coefficient to obtain the test life of the power distribution device under the actual working condition. In this embodiment, according to various coolant temperatures T under charging conditions, fiel.d The corresponding working time percentage p i and the corresponding acceleration factor A T,i , through the formula The test life t of the three-in-one power distribution device under charging conditions is calculated HTOE1 , where p i For the three-in-one power distribution device at the coolant temperature T field.i Working time under charging condition Total working time under charging condition t charge The proportion of various coolant temperatures T under driving conditions field.j The corresponding working time percentage p j and the corresponding acceleration factor A T,j , through the formula The test life t of the three-in-one power distribution device under driving conditions is calculated HTOE2 , where p j For the three-in-one power distribution device at the coolant temperature T field.j Working time under driving conditions Total working time under driving conditions t drive The proportion of the cooling fluid temperature T under the inverter working condition field.s The corresponding working time percentage p s and the corresponding acceleration factor AT,s , through the formula The test life t of the three-in-one power distribution device under inverter conditions is calculated HTOE3 , where p s For the three-in-one power distribution device at the coolant temperature T field.s The total working time under inverter condition is t inversion The proportion of .

[0042] The embodiment of the present application also provides a device for determining the life of a power distribution device. It should be noted that the device for determining the life of a power distribution device in the embodiment of the present application can be used to execute the method for determining the life of a power distribution device provided in the embodiment of the present application. The device for determining the life of a power distribution device provided in the embodiment of the present application is introduced below.

[0043] Figure 2 Schematic diagram of a device for determining the life of a power distribution device according to an embodiment of the present application. Figure 2 As shown, the device comprises:

[0044] An acquisition unit 10 is configured to acquire the total working time, multiple test temperatures and multiple working time percentages of the above-mentioned power distribution device under actual working conditions, wherein the above-mentioned working time percentages correspond to the above-mentioned test temperatures one by one, and the above-mentioned working time percentages are the ratio of the working time of the above-mentioned power distribution device at the corresponding above-mentioned test temperature to the above-mentioned total working time, and the above-mentioned test temperature is the temperature of the coolant of the above-mentioned power distribution device;

[0045] A first calculation unit 20 calculates a plurality of acceleration factors according to the test temperature and the activation energy parameter, wherein the acceleration factors correspond to the test temperature one by one, the activation energy parameter is the activation energy corresponding to the coolant failure mode, and the coolant failure mode is a mode in which the coolant fails to dissipate heat for the power distribution device;

[0046] The second calculation unit 30 calculates the test life of the above-mentioned distribution device under the above-mentioned actual working conditions according to the above-mentioned total working time, all the above-mentioned working time percentages and the corresponding above-mentioned acceleration factors.

[0047] In the device for determining the life of the above-mentioned distribution device, an acquisition unit acquires the total working time, multiple test temperatures and multiple working time percentages of the above-mentioned distribution device under actual working conditions, the above-mentioned working time percentages correspond to the above-mentioned test temperatures one-to-one, the above-mentioned working time percentages are the ratio of the working time of the above-mentioned distribution device at the corresponding above-mentioned test temperature to the above-mentioned total working time, and the above-mentioned test temperature is the temperature of the coolant of the above-mentioned distribution device; a first calculation unit calculates multiple acceleration factors according to the above-mentioned test temperatures and activation energy parameters, the above-mentioned acceleration factors correspond to the above-mentioned test temperatures one-to-one, the above-mentioned activation energy parameters are the activation energy corresponding to the coolant failure mode, and the above-mentioned coolant failure mode is the mode in which the above-mentioned coolant fails to dissipate heat of the above-mentioned distribution device; a second calculation unit calculates the test life of the above-mentioned distribution device under the above-mentioned actual working conditions according to the above-mentioned total working time, all the above-mentioned working time percentages and the corresponding above-mentioned acceleration factors. The device obtains multiple working time percentages to obtain the proportion of the working time of the distribution device at various coolant temperatures in the total working time under actual working conditions, calculates various acceleration factors according to the test temperature and activation energy parameters, and obtains the acceleration factors at various coolant temperatures under actual working conditions. According to the working time percentages and corresponding acceleration factors corresponding to various coolant temperatures under actual working conditions, the test life of the distribution device under actual working conditions is calculated, so that the obtained test life of the three-in-one distribution device is more in line with reality. The device solves the problem of low accuracy of the life of the distribution device measured by the high-temperature endurance test based on ambient temperature in the prior art.

[0048] It should be noted that the above-mentioned power distribution device is a three-in-one power distribution device, which includes an on-board charger, DCDC and PDU.

[0049] It should also be noted that when the traditional high-temperature durability test method is used to test the life of a three-in-one power distribution device, only a single power distribution device can be tested. The single power distribution device is any one of the on-board charger, DCDC and PDU. The present application realizes the life test of the three-in-one power distribution device, and the present application integrates the test life of the three-in-one power distribution device under multiple actual working conditions, and takes into account the influence of various actual working conditions on the test life of the three-in-one power distribution device. The present application solves the problem of single test products and test modes in the prior art, and solves the problem that the influence of various actual working conditions on the test life of the three-in-one power distribution device cannot be comprehensively considered when conducting the life test of the three-in-one power distribution device in the prior art. The present application is compatible with a variety of tested products and covers a variety of actual working conditions, which is conducive to large-scale promotion.

[0050] It should also be noted that when the traditional high-temperature durability test method is used to test the life of a three-in-one power distribution device, it is considered that the three-in-one power distribution device is not directly cooled by the coolant, but is cooled by internal air convection or conduction of structural parts. The traditional high-temperature durability test method calculates the acceleration factor according to various ambient temperatures, and the test life of the three-in-one power distribution device obtained deviates from the actual test life. A higher test life of the three-in-one power distribution device will increase the cost and extend the test cycle. A lower test life of the three-in-one power distribution device will affect the reliability of the vehicle and mislead the positive progress of research and development work. This application takes into account the three-in-one power distribution device in actual applications. The main failure mode of the device is the failure mode of the cooling function of the IGBT module of the three-in-one distribution device caused by the coolant, which is not stimulated by simple high-temperature stress. That is, the influence of the failure of the cooling function of the IGBT module of the three-in-one distribution device caused by the coolant on the life of the three-in-one distribution device in actual conditions is taken into account. Therefore, when determining the activation energy parameters, the activation energy corresponding to the coolant failure mode is selected, and the test life of the three-in-one distribution device under actual working conditions is calculated according to the working time percentages and corresponding acceleration factors corresponding to various coolant temperatures under actual working conditions, so that the measured test life of the three-in-one distribution device is more in line with reality.

[0051] In one embodiment of the present application, the power distribution device is a power distribution device of a vehicle, and the actual working conditions include charging conditions, driving conditions, and inverter conditions. The charging conditions are the working conditions of the power distribution device when the vehicle is charging, the driving conditions are the working conditions of the power distribution device when the vehicle is driving, and the inverter conditions are the working conditions of the power distribution device when the power distribution device performs DC inverter. In this embodiment, the test life of the three-in-one power distribution device under charging conditions, the test life of the three-in-one power distribution device under driving conditions, and the test life of the three-in-one power distribution device under inverter conditions are tested respectively, which solves the problem in the prior art that when testing the life of the three-in-one power distribution device, the influence of various actual working conditions on the test life of the three-in-one power distribution device cannot be comprehensively considered, so that the method for determining the life of the three-in-one power distribution device of the present application can be compatible with a variety of tested products and can cover a variety of actual working conditions, which is conducive to large-scale promotion.

[0052] It should be noted that the above-mentioned vehicles are electric vehicles.

[0053] In one embodiment of the present application, the device for determining the life of the power distribution device further includes a first acquisition unit and a third calculation unit, wherein the first acquisition unit is used to acquire multiple operating parameters of the power distribution device under the actual working conditions; the third calculation unit is used to calculate the working time of the power distribution device under the actual working conditions according to the multiple operating parameters, and obtain the total working time. In this embodiment, the total mileage D of the three-in-one power distribution device within the design life is obtained. life , kilometers per kWhD 1kWh, the total power P of the three-in-one power distribution device is calculated by the formula Calculate the total working time t of the three-in-one power distribution device under charging conditions charge , obtain the total mileage D of the three-in-one power distribution device within its design life life , average speed of passenger cars V average , through the formula Calculate the total working time t of the three-in-one power distribution device under driving conditions drive The total working time of the three-in-one power distribution device under the inverter condition is the custom value t inversion .

[0054] In one embodiment of the present application, the first calculation unit includes an acquisition module and a first calculation module, the acquisition module is used to obtain the maximum value of the test temperatures to obtain the highest test temperature; the first calculation module is used to calculate the multiple acceleration factors using the Arrhenius formula according to the highest test temperature, each preliminary test temperature and the activation energy parameter, the acceleration factors correspond to the preliminary test temperatures one by one, and the preliminary test temperature is any one of the test temperatures. In this embodiment, when the actual working condition is the charging working condition, the maximum value of the test temperature under the actual working condition is obtained, that is, the various coolant temperatures T under the charging working condition are obtained. field.i The maximum value among them gives the highest test temperature T text1.max , according to the maximum test temperature T text1.max , various coolant temperatures T under charging conditions field.i and activation energy parameter E A , using the Arrhenius formula The acceleration factor A at various coolant temperatures under charging conditions is calculated T,i When the actual working condition is the driving condition, the maximum value of the test temperature under the actual working condition is obtained, that is, the various coolant temperatures T under the driving condition are obtained. field.j The maximum value among them gives the highest test temperature T text2.max , according to the maximum test temperature T text2.max , various coolant temperatures T under driving conditions field.j and activation energy parameter E A , using the Arrhenius formula Calculate the acceleration factor A at various coolant temperatures under driving conditions T,j When the actual working condition is the inverter working condition, obtain the maximum value of the test temperature under the actual working condition, that is, obtain the various coolant temperatures T under the inverter working condition. field.s The maximum value among them gives the highest test temperature T text3.max , according to the maximum test temperature T text3.max , various coolant temperatures T under inverter conditions field.sand activation energy parameter EA, using the Arrhenius formula The acceleration factor A at various coolant temperatures under inverter conditions is calculated T,s .

[0055] In one embodiment of the present application, the apparatus for determining the life of the power distribution device further includes a second acquisition unit, and the second acquisition unit is used to acquire the activation energy parameter according to the coolant failure mode. In this embodiment, before calculating each acceleration factor, the activation energy corresponding to the coolant failure mode is acquired to obtain the activation energy parameter E A The coolant failure mode takes into account the situation in which the IGBT module in the three-in-one power distribution device fails due to the failure of the coolant's heat dissipation function in the actual use of the electric vehicle, that is, it takes into account the influence of the coolant temperature on the life of the three-in-one power distribution device in the actual use of the electric vehicle. Compared with the prior art that considers the influence of ambient temperature on the life of the three-in-one power distribution device, the acceleration factors at various coolant temperatures calculated by the activation energy corresponding to the coolant failure mode in this application are more in line with the actual situation, thereby making the measured test life of the three-in-one power distribution device more practical and more accurate.

[0056] In one embodiment of the present application, the second calculation unit includes a second calculation module, a third calculation module and a fourth calculation module. The second calculation module is used to calculate the ratio of each of the above working time percentages to the corresponding acceleration factor to obtain multiple ratios; the third calculation module is used to calculate the sum of all the above ratios to obtain the acceleration factor; the fourth calculation module is used to calculate the product of the total working time and the acceleration factor to obtain the test life of the power distribution device under the actual working condition. In this embodiment, according to the various coolant temperatures T under the charging condition, field.i The corresponding working time percentage p i and the corresponding acceleration factor A T,i , through the formula The test life t of the three-in-one power distribution device under charging conditions is calculated HTOE1 , where p i For the three-in-one power distribution device at the coolant temperature T field.i Working time under charging condition Total working time under charging condition t charge The proportion of various coolant temperatures T under driving conditions field.j The corresponding working time percentage p j and the corresponding acceleration factor A T,j , through the formula The test life t of the three-in-one power distribution device under driving conditions is calculated HTOE2 , where p j For the three-in-one power distribution device at the coolant temperature Tfield.j Working time under driving conditions Total working time under driving conditions t drive The proportion of the cooling fluid temperature T under the inverter working condition field.s The corresponding working time percentage p s and the corresponding acceleration factor A T,s , through the formula The test life t of the three-in-one power distribution device under inverter conditions is calculated HTOE3 , where p s For the three-in-one power distribution device at the coolant temperature T field.s The total working time under inverter condition is t inversion The proportion of .

[0057] The above-mentioned device for determining the life of the distribution device includes a processor and a memory. The above-mentioned acquisition unit, the first calculation unit, the second calculation unit, etc. are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions.

[0058] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the problem of low accuracy of the life of the power distribution device measured by the high-temperature endurance test based on the ambient temperature in the prior art is solved by adjusting the kernel parameters.

[0059] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0060] An embodiment of the present invention provides a storage medium having a program stored thereon, and when the program is executed by a processor, the method for determining the life of the above-mentioned power distribution device is implemented.

[0061] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the method for determining the life of the power distribution device is executed when the program is run.

[0062] An embodiment of the present invention provides a vehicle, comprising: a device for determining the life of a power distribution device, one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing any one of the above methods, and when the processor executes the program, at least the following steps are implemented:

[0063] Step S101, obtaining the total working time, multiple test temperatures and multiple working time percentages of the above-mentioned power distribution device under actual working conditions, wherein the above-mentioned working time percentages correspond to the above-mentioned test temperatures one by one, and the above-mentioned working time percentages are the ratios of the working time of the above-mentioned power distribution device at the corresponding above-mentioned test temperatures to the above-mentioned total working time, and the above-mentioned test temperature is the temperature of the coolant of the above-mentioned power distribution device;

[0064] Step S102, a plurality of acceleration factors are calculated according to the test temperature and the activation energy parameter, wherein the acceleration factors correspond to the test temperature one by one, the activation energy parameter is the activation energy corresponding to the coolant failure mode, and the coolant failure mode is the mode in which the coolant fails to dissipate heat for the power distribution device;

[0065] Step S103, calculating the test life of the power distribution device under the actual working conditions according to the total working time, all the percentages of the working time and the corresponding acceleration factors.

[0066] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0067] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0068] Step S101, obtaining the total working time, multiple test temperatures and multiple working time percentages of the above-mentioned power distribution device under actual working conditions, wherein the above-mentioned working time percentages correspond to the above-mentioned test temperatures one by one, and the above-mentioned working time percentages are the ratios of the working time of the above-mentioned power distribution device at the corresponding above-mentioned test temperatures to the above-mentioned total working time, and the above-mentioned test temperature is the temperature of the coolant of the above-mentioned power distribution device;

[0069] Step S102, a plurality of acceleration factors are calculated according to the test temperature and the activation energy parameter, wherein the acceleration factors correspond to the test temperature one by one, the activation energy parameter is the activation energy corresponding to the coolant failure mode, and the coolant failure mode is the mode in which the coolant fails to dissipate heat for the power distribution device;

[0070] Step S103, calculating the test life of the power distribution device under the actual working conditions according to the total working time, all the working time percentages and the corresponding acceleration factors.

[0071] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0072] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the above-mentioned units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0073] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0074] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0075] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the above-mentioned methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0076] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0077] 1) In the method for determining the life of the power distribution device of the present application, first, the total working time, multiple test temperatures and multiple working time percentages of the above-mentioned power distribution device under actual working conditions are obtained, the above-mentioned working time percentages correspond to the above-mentioned test temperatures one-to-one, the above-mentioned working time percentages are the ratio of the working time of the above-mentioned power distribution device at the corresponding above-mentioned test temperature to the above-mentioned total working time, and the above-mentioned test temperature is the temperature of the coolant of the above-mentioned power distribution device; then, multiple acceleration factors are calculated according to the above-mentioned test temperatures and activation energy parameters, the above-mentioned acceleration factors correspond to the above-mentioned test temperatures one-to-one, the above-mentioned activation energy parameters are the activation energies corresponding to the coolant failure mode, and the above-mentioned coolant failure mode is the mode in which the above-mentioned coolant fails in the heat dissipation function of the above-mentioned power distribution device; finally, according to the above-mentioned total working time, all the above-mentioned working time percentages and the corresponding above-mentioned acceleration factors, the test life of the above-mentioned distribution device under the above-mentioned actual working conditions is calculated. The method obtains multiple working time percentages to obtain the proportion of the working time of the distribution device at various coolant temperatures in the total working time under actual working conditions, calculates various acceleration factors according to the test temperature and activation energy parameters, obtains the acceleration factors at various coolant temperatures under actual working conditions, calculates the test life of the distribution device under actual working conditions according to the working time percentages and corresponding acceleration factors corresponding to various coolant temperatures under actual working conditions, and makes the obtained test life of the three-in-one distribution device more in line with reality. This method solves the problem of low accuracy of the life of the distribution device measured by the high-temperature endurance test based on ambient temperature in the prior art.

[0078] 2) In the device for determining the life of a power distribution device of the present application, an acquisition unit is provided for acquiring the total working time of the above-mentioned power distribution device under actual working conditions, multiple test temperatures and multiple working time percentages, the above-mentioned working time percentages correspond one-to-one to the above-mentioned test temperatures, the above-mentioned working time percentages are the ratio of the working time of the above-mentioned power distribution device at the corresponding above-mentioned test temperature to the above-mentioned total working time, and the above-mentioned test temperature is the temperature of the coolant of the above-mentioned power distribution device; a first calculation unit is provided for calculating multiple acceleration factors according to the above-mentioned test temperatures and activation energy parameters, the above-mentioned acceleration factors correspond one-to-one to the above-mentioned test temperatures, the above-mentioned activation energy parameters are the activation energy corresponding to the coolant failure mode, and the above-mentioned coolant failure mode is the mode in which the above-mentioned coolant fails in the heat dissipation function of the above-mentioned power distribution device; a second calculation unit is provided for calculating the test life of the above-mentioned power distribution device under the above-mentioned actual working conditions according to the above-mentioned total working time, all the above-mentioned working time percentages and the corresponding above-mentioned acceleration factors. The device obtains multiple working time percentages to obtain the proportion of the working time of the distribution device at various coolant temperatures in the total working time under actual working conditions, calculates various acceleration factors according to the test temperature and activation energy parameters, and obtains the acceleration factors at various coolant temperatures under actual working conditions. According to the working time percentages and corresponding acceleration factors corresponding to various coolant temperatures under actual working conditions, the test life of the distribution device under actual working conditions is calculated, so that the obtained test life of the three-in-one distribution device is more in line with reality. The device solves the problem of low accuracy of the life of the distribution device measured by the high-temperature endurance test based on ambient temperature in the prior art.

[0079] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining the life of a power distribution device, characterized in that: The method comprises: Obtain the total working time, multiple test temperatures and multiple working time percentages of the power distribution device under actual working conditions, wherein the working time percentage corresponds to the test temperature one-to-one, the working time percentage is the ratio of the working time of the power distribution device at the corresponding test temperature to the total working time, and the test temperature is the temperature of the coolant of the power distribution device; A plurality of acceleration factors are calculated according to the test temperature and the activation energy parameter, wherein the acceleration factors correspond to the test temperature one by one, the activation energy parameter is the activation energy corresponding to the coolant failure mode, and the coolant failure mode is the mode in which the coolant fails to dissipate heat for the power distribution device; Calculate the test life of the power distribution device under the actual working conditions according to the total working time, all the working time percentages and the corresponding acceleration factors; Among them, according to the total working time, all the working time percentages and the corresponding acceleration factors, the test life of the distribution device under the actual working conditions is calculated, including: calculating the ratio of each working time percentage to the corresponding acceleration factor to obtain multiple ratios; calculating the sum of all the ratios to obtain the acceleration coefficient; calculating the product of the total working time and the acceleration coefficient to obtain the test life of the distribution device under the actual working conditions.

2. The method according to claim 1, characterized in that The power distribution device is a power distribution device of a vehicle, and the actual operating conditions include charging conditions, driving conditions and inversion conditions. The charging conditions are the working states of the power distribution device when the vehicle is charging, the driving conditions are the working states of the power distribution device when the vehicle is driving, and the inversion conditions are the working states of the power distribution device when the power distribution device performs DC inversion.

3. The method according to claim 1, characterized in that Before obtaining the total working time, multiple test temperatures and multiple working time percentages of the power distribution device under actual working conditions, the method further includes: Acquire multiple operating parameters of the power distribution device under the actual working condition; The operating time of the power distribution device under the actual working conditions is calculated based on the multiple operating parameters to obtain the total operating time.

4. The method according to claim 1, characterized in that A plurality of acceleration factors are calculated based on the test temperature and activation energy parameters, including: Obtaining a maximum value among the test temperatures to obtain a maximum test temperature; According to the highest test temperature, each preliminary test temperature and the activation energy parameter, the Arrhenius formula is used to calculate multiple acceleration factors, and the acceleration factors correspond to each preliminary test temperature one by one. The preliminary test temperature is any one of the test temperatures.

5. The method according to claim 1, characterized in that Before calculating a plurality of acceleration factors according to the test temperature and activation energy parameters, the method further includes: The activation energy parameter is obtained according to the coolant failure mode.

6. A device for determining the life of a power distribution device, characterized in that: The device comprises: An acquisition unit, which acquires the total working time, multiple test temperatures and multiple working time percentages of the power distribution device under actual working conditions, wherein the working time percentages correspond to the test temperatures one by one, and the working time percentages are the ratio of the working time of the power distribution device at the corresponding test temperature to the total working time, and the test temperature is the temperature of the coolant of the power distribution device; A first calculation unit calculates a plurality of acceleration factors according to the test temperature and the activation energy parameter, wherein the acceleration factors correspond to the test temperature one by one, the activation energy parameter is the activation energy corresponding to the coolant failure mode, and the coolant failure mode is a mode in which the coolant fails to dissipate heat for the power distribution device; A second calculation unit, calculating the test life of the power distribution device under the actual working condition according to the total working time, all the working time percentages and the corresponding acceleration factors; Among them, the second calculation unit is also used to calculate the ratio of each working time percentage to the corresponding acceleration factor to obtain multiple ratios; calculate the sum of all the ratios to obtain the acceleration coefficient; calculate the product of the total working time and the acceleration coefficient to obtain the test life of the distribution device under the actual working conditions.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the method of any one of claims 1 to 5.

8. A processor, characterized in that: The processor is used to run a program, wherein the program executes the method according to any one of claims 1 to 5 when running.

9. A vehicle, characterized in that: include: A device for determining the life of a distribution device, one or more processors, a memory and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 5.

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