A method and device for predicting the weld life of a battery pack support frame

Abstract

The present application discloses a method and device for predicting the weld life of a battery pack support frame, wherein the method includes: constructing a finite element model of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame; performing finite element simulation on the weld finite element model based on the acceleration information corresponding to the battery pack created for the target planning route to obtain a stress set corresponding to the weld; calculating the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame based on the stress set and the acceleration time series load spectrum of the battery pack; and predicting the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame based on the simulated structural stress and strain fatigue life curve. The present application can accurately predict the weld life of the battery pack support frame, solving the problem that related technologies cannot predict the fatigue life of the weld of the battery pack support frame, thereby improving the accuracy of fatigue life prediction of the battery pack support frame.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of vehicle detection technology, and in particular to a method and device for predicting the weld life of a battery pack support frame. Background Art

[0002] At present, electric dump trucks are the main vehicle-mounted transportation tools for coal mining and stone mining. Because the roads they operate on are generally mountainous areas with poor road conditions and harsh load environments, the acceleration, braking, and steering required by electric dump trucks during their operation are greater than those of ordinary fuel vehicles. In addition, the bumpy road conditions in which they operate will affect the fatigue life of the battery pack support frame they are installed on, especially the fatigue life of the welds corresponding to the connection area between the battery pack support frame and the frame, which can easily lead to cracking failures in the welds corresponding to the connection area between the battery pack support frame and the frame.

[0003] However, in the prior art, there is no method that can predict the fatigue life of the welds of the battery pack support frame. Therefore, in order to prevent cracking in the welds corresponding to the connection area between the battery pack support frame and the vehicle frame, a method that can effectively predict the weld life of the battery support frame is urgently needed. Summary of the Invention

[0004] The present application provides a method and device for predicting the weld life of a battery pack support frame, which solves the problem that related technologies cannot predict the fatigue life of the welds of the battery pack support frame, thereby improving the accuracy of predicting the fatigue life of the battery pack support frame.

[0005] In a first aspect, a method for predicting the weld life of a battery pack support frame is provided, which is applied to an electric dump truck. The electric dump truck includes a battery pack support frame and a vehicle frame. The method includes:

[0006] Construct a finite element model of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame;

[0007] Based on the acceleration information corresponding to the battery pack created for the target planning route, a finite element simulation is performed on the weld finite element model to obtain the corresponding stress set of the weld; the stress set includes the reaction force and reaction moment in the X direction, the reaction force and reaction moment in the Y direction, and the reaction force and reaction moment in the Z direction;

[0008] Calculate the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame based on the stress aggregation and the battery pack's acceleration time-series load spectrum.

[0009] Based on the simulated structural stress and strain fatigue life curves, the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the frame is predicted.

[0010] Optionally, the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame is calculated based on the stress set and the acceleration time series load spectrum of the battery pack, including:

[0011] The stress set and the battery pack's acceleration time series load spectrum are input into the weld fatigue solver to calculate the initial simulated structural stress corresponding to the weld in the area where the battery pack support frame connects to the vehicle frame.

[0012] The initial simulation structure stress is corrected according to a preset correction method to obtain the final simulation structure stress; the preset correction method includes at least one of a stress combination method, a mean stress correction method, a survival rate setting method and a multi-axis estimation method.

[0013] Optionally, the stress set and the acceleration time series load spectrum of the battery pack are input into the weld fatigue solver engine for calculation to obtain the initial simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame, including:

[0014] Based on the stress set, the weld fatigue solver engine calculates the calibrated stress corresponding to the weld in the area where the battery pack support frame connects to the vehicle frame. The calibrated stress includes membrane stress and bending stress.

[0015] The initial simulation structural stress is obtained based on the calculation of the calibration stress and the acceleration time series load spectrum of the battery pack by the weld fatigue solver engine.

[0016] Optionally, the fatigue life includes the number of operating lives during which a weld corresponding to the connection area between the battery pack support frame and the vehicle frame is damaged during cyclic operation within a target planned route; and the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame is predicted based on a simulated structural stress and strain fatigue life curve, including:

[0017] Based on the simulated structural stress and strain fatigue life curves, the number of operating cycles corresponding to the simulated structural stress value on the strain fatigue life curve is determined, and the number of operating cycles is used as the number of operating life cycles required for the weld corresponding to the connection area between the battery pack support frame and the frame to be damaged during cyclic operation within the target planned route.

[0018] Alternatively, the strain fatigue life curve is obtained by the following method:

[0019] Apply a preset load to the weld finite element model to obtain a simulated stress set corresponding to the weld in the area where the battery pack support frame connects to the vehicle frame. The simulated stress set includes simulated reaction forces and simulated reaction moments in the X direction, simulated reaction forces and simulated reaction moments in the Y direction, and simulated reaction forces and simulated reaction moments in the Z direction.

[0020] Based on the simulated stress set and acceleration time series load spectrum, the simulated structural stress corresponding to the weld is obtained;

[0021] The strain fatigue life curve is obtained based on the simulated structural stress and the weld structure corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame.

[0022] Optionally, a finite element model of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame is constructed, including:

[0023] Build an initial finite element model corresponding to the connection area between the battery pack support frame and the vehicle frame;

[0024] The weld, weld toe, weld leg and weld throat in the initial finite element model are modified based on the ASME specification to obtain a modified finite element model;

[0025] The weight of the battery pack is assigned to the position corresponding to the battery pack support frame in the modified finite element model to obtain the final weld finite element model.

[0026] Optionally, the acceleration time-series load spectrum of the battery pack is determined based on the acceleration information and stress information corresponding to the battery pack during the operation of the electric dump truck on the target planned route; the stress information is the measured stress corresponding to the battery pack in the X direction, Y direction and Z direction respectively.

[0027] In a second aspect, a device for predicting the weld life of a battery pack support frame is provided, which is applied to an electric dump truck. The electric dump truck includes a battery pack support frame and a vehicle frame. The device includes:

[0028] A finite element model building module is used to construct a finite element model of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame;

[0029] A stress set determination module is used to perform finite element simulation on the weld finite element model based on the acceleration information corresponding to the battery pack created for the target planned route to obtain the corresponding stress set of the weld; the stress set includes the reaction force and reaction moment in the X direction, the reaction force and reaction moment in the Y direction, and the reaction force and reaction moment in the Z direction;

[0030] A simulation structural stress calculation module is used to calculate the simulation structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame based on the stress set and the acceleration time series load spectrum of the battery pack;

[0031] The life prediction module is used to predict the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the frame based on the simulated structural stress and strain fatigue life curve.

[0032] According to a third aspect, an electronic device is provided, including:

[0033] A processor and a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the above-mentioned first aspect or its various implementation modes.

[0034] In a fourth aspect, a computer-readable storage medium is provided for storing a computer program, wherein the computer program enables a computer to execute the method in the above-mentioned first aspect or its various implementations.

[0035] Through the technical solution provided by the present application, by performing finite element simulation on the weld finite element model based on the acceleration information corresponding to the battery pack created for the target planning route, the obtained stress set corresponding to the weld can be made to have a small deviation from the actual stress set of the weld of the battery pack support frame of the electric dump truck when it is running on the target planning route; at the same time, by calculating the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the frame based on the stress set obtained from the simulation of the weld finite element model and the acceleration time series load spectrum of the battery pack, it is also possible to accurately simulate the actual structural stress corresponding to the weld in the connection area between the battery pack support frame and the frame of the electric dump truck when it is traveling on the target planning route, so that the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the frame predicted according to the simulated structural stress and strain fatigue life curve has a high accuracy. It can be seen that the present application can accurately predict the weld life of the battery pack support frame, solving the problem that the related art fails to predict the fatigue life of the weld of the battery pack support frame, thereby improving the accuracy of the fatigue life prediction of the battery pack support frame.

[0036] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 An application scenario diagram provided for an embodiment of the present application;

[0039] Figure 2 A flowchart of a method for predicting the weld life of a battery pack support frame provided in an embodiment of the present application;

[0040] Figure 3 A schematic diagram of the connection between the battery pack support frame and the vehicle frame provided in an embodiment of the present application;

[0041] Figure 4A schematic diagram of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame provided in an embodiment of the present application;

[0042] Figure 5 A flowchart of another method for predicting the weld life of a battery pack support frame provided in an embodiment of the present application;

[0043] Figure 6 A schematic diagram of a device for predicting the weld life of a battery pack support frame provided in an embodiment of the present application;

[0044] Figure 7 This is a schematic block diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or server that includes 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.

[0047] It should be understood that the technical solution of this application can be applied to the following scenarios, but is not limited to:

[0048] In some implementations, Figure 1 An application scenario diagram provided in an embodiment of the present application, such as Figure 1 As shown, the application scenario may include an electronic device 110 and a network device 120. The electronic device 110 may establish a connection with the network device 120 via a wired network or a wireless network.

[0049] Exemplarily, the electronic device 110 may be a desktop computer, a laptop computer, a tablet computer, etc., but is not limited thereto. The network device 120 may be a terminal device or a server, but is not limited thereto. In one embodiment of the present application, the electronic device 110 may send a request message to the network device 120, and the request message may be used to request the construction of a weld finite element model corresponding to the connection area between the battery pack support frame and the frame. Furthermore, the electronic device 110 may receive a response message sent by the network device 120, and the response message includes obtaining the construction of a weld finite element model corresponding to the connection area between the battery pack support frame and the frame.

[0050] also, Figure 1 An electronic device 110 and a network device 120 are exemplarily provided. In practice, other numbers of electronic devices and network devices may be included, and this application does not impose any limitation thereto.

[0051] In other possible implementations, the technical solution of the present application may also be executed by the above-mentioned electronic device 110, or the technical solution of the present application may also be executed by the above-mentioned network device 120, and the present application does not impose any restrictions on this.

[0052] After introducing the application scenarios of the embodiments of the present application, the technical solutions of the present application will be described in detail below:

[0053] Figure 2 A flowchart of a method for predicting the weld life of a battery pack support frame provided in an embodiment of the present application, the method is applied to an electric dump truck, which includes a battery pack support frame and a frame, and can be Figure 1 The electronic device 110 shown in FIG. Figure 2 As shown, the method may include the following steps:

[0054] S210: Construct a finite element model of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame.

[0055] See also Figure 3 and 4 When constructing the finite element model of the weld, refer to Figure 3 The frame to which the battery pack support frame is attached is cut on the left and right sides of its length. At the same time, the retained frame part is also corrected by geometric drawing of surfaces, chamfer cleaning, merging of nodes, and welding connections based on ASME specifications.

[0056] S220. Based on the acceleration information corresponding to the battery pack created for the target planned route, perform finite element simulation on the weld finite element model to obtain a stress set corresponding to the weld.

[0057] The stress set includes the reaction force and reaction moment in the X direction, the reaction force and reaction moment in the Y direction, and the reaction force and reaction moment in the Z direction.

[0058] It should be noted that the target planning route may be "loading place-unloading place-loading place", wherein the loading place and the unloading place are both the target loading place and the target unloading place in the area where the electric dump truck actually operates.

[0059] Among them, the acceleration information corresponding to the battery pack created for the target planning route can be understood as: the measured acceleration information corresponding to the battery pack during the two cyclic operations of the electric dump truck at the target loading location and the target unloading location in the actual operating area. Here, the acceleration information corresponding to the battery pack is the response result of the battery pack being transmitted step by step to the excitations such as vehicle acceleration, braking, steering, and road bumps during the operation. Therefore, the acceleration information of the battery pack can be used as the structural capacity design load of the battery pack support frame; among them, the measured acceleration information may include the three-direction (XYZ) acceleration on the battery pack; the three-direction (XYZ) acceleration can be measured by an acceleration monitoring sensor.

[0060] It should also be noted that the stress set corresponding to the weld is based on the reaction forces and reaction moments in the X, Y, and Z directions corresponding to the weld toe position in the weld finite element model.

[0061] S230. Calculate the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame based on the stress set and the acceleration time series load spectrum of the battery pack.

[0062] Since the reaction force and reaction moment in the X direction, the reaction force and reaction moment in the Y direction, and the reaction force and reaction moment in the Z direction in the stress set are all static stress results corresponding to the welds of the battery support frame, they are used to express the stress distribution at the welds of the battery support frame; the acceleration time series load spectrum of the battery pack is used as the dynamic load input, so here, based on the stress set and the acceleration time series load spectrum of the battery pack, the simulated structural stress corresponding to the welds in the connection area between the battery pack support frame and the frame when the electric dump truck is traveling on the target planned route can be accurately simulated, so as to improve the accuracy of the fatigue life prediction of the welds corresponding to the connection area between the battery pack support frame and the frame in step S240.

[0063] S240. Predict the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame based on the simulated structural stress and strain fatigue life curve.

[0064] Since the structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame is related to the weld life, the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame can be quickly predicted based on the simulated structural stress and strain fatigue life curve.

[0065] By adopting the above method, the finite element simulation of the weld finite element model is performed based on the acceleration information corresponding to the battery pack created for the target planning route, so that the stress set corresponding to the weld can be made to have a small deviation from the actual stress set of the weld of the battery pack support frame of the electric dump truck when it is running on the target planning route; at the same time, the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the frame is calculated based on the stress set obtained from the simulation of the weld finite element model and the acceleration time series load spectrum of the battery pack. It can also accurately simulate the actual structural stress corresponding to the weld in the connection area between the battery pack support frame and the frame of the electric dump truck when it is traveling on the target planning route, so that the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the frame predicted according to the simulated structural stress and strain fatigue life curve has a high accuracy. It can be seen that the present application can accurately predict the weld life of the battery pack support frame, solves the problem that the related art fails to predict the fatigue life of the weld of the battery pack support frame, and thus improves the accuracy of the fatigue life prediction of the battery pack support frame.

[0066] In some possible embodiments, calculating the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame based on the stress set and the acceleration time series load spectrum of the battery pack may include the following steps:

[0067] S310: Input the stress set and the acceleration time series load spectrum of the battery pack into the weld fatigue solving engine for calculation to obtain the initial simulation structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame.

[0068] See also Figure 5 , the weld fatigue solving engine can be the nCode DesignLife solid weld fatigue solving engine. It should be noted that, Figure 5 The X-direction finite element file can be the reaction force and reaction moment of the weld in the X direction simulated by the weld finite element model; the Y-direction finite element file can be the reaction force and reaction moment of the weld in the Y direction simulated by the weld finite element model; the Z-direction finite element file can be the reaction force and reaction moment of the weld in the Z direction simulated by the weld finite element model.

[0069] In this step, by inputting the stress set and the acceleration time series load spectrum of the battery pack into the weld fatigue solver engine for calculation, the initial simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the frame can be quickly obtained.

[0070] S320: Correct the initial simulated structural stress according to a preset correction method to obtain a final simulated structural stress.

[0071] The preset correction method includes at least one of a stress combination method, a mean stress correction method, a survival rate setting method and a multi-axis estimation method.

[0072] Here, the stress combination method may be defined as the WeldNormal method; and the survival rate setting method may be set to set the survival rate to 50%.

[0073] In this step, by correcting the initial simulated structural stress according to a preset correction method, the final simulated structural stress can be made closer to the actual value, thereby improving the accuracy of the prediction result corresponding to the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the frame.

[0074] By adopting the above method, the initial simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the frame can be quickly obtained. At the same time, after correcting the initial simulated structural stress according to a preset correction method, a simulated structural stress that is closer to the actual structural stress corresponding to the weld of the battery pack support frame of the electric dump truck during driving on the target planned route can be obtained. Therefore, the above method can improve the efficiency and accuracy of fatigue life prediction of the weld corresponding to the connection area between the battery pack support frame and the frame.

[0075] In some possible embodiments, the stress set and the acceleration time series load spectrum of the battery pack are input into the weld fatigue solver engine for calculation to obtain the initial simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame, which may include the following steps:

[0076] S410. Based on the stress set, a weld fatigue solver engine is used to calculate and obtain a calibration stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame.

[0077] The calibration stress includes membrane stress and bending stress; here, membrane stress and bending stress can reflect the material properties corresponding to the weld.

[0078] Here, nCode software can be used to calculate the reaction forces and moments corresponding to the welds in the stress set, the reaction forces and moments in the Y direction, and the reaction forces and moments in the Z direction to obtain the membrane stress and bending stress corresponding to the welds in the connection area between the battery pack support frame and the vehicle frame.

[0079] S420. Obtain the initial simulated structural stress based on the calculation of the calibration stress and the acceleration time series load spectrum of the battery pack by the weld fatigue solving engine.

[0080] Specifically, the calculation process of the initial simulation structure stress may include the following steps:

[0081] (1) In the weld fatigue solving engine, the combination coefficient can be calculated using the following formula:

[0082]

[0083] in, is the combination coefficient; To solve for the engine scale factor, ; is the material stress bias, ; is the material proportional coefficient, ; is the load proportionality factor, ; is the stress bias, ; is the calibration stress; is the divisor coefficient, ; is the acceleration time series load spectrum of the battery pack.

[0084] (2) The weld fatigue solver engine calculates the calibration stress based on the combination coefficient to obtain the initial simulation structure stress.

[0085] In this step, by calculating the calibrated stress and the battery pack's acceleration time-series load spectrum based on the weld fatigue solver engine, a simulated structural stress can be obtained that is closer to the actual structural stress corresponding to the battery pack support frame weld during driving on the target planned route.

[0086] Using the above method, the stress set can be calculated through the weld fatigue solver engine, and the calibrated stress used to characterize the material properties of the weld in the connection area between the battery pack support frame and the frame can be quickly obtained; then, based on the calculation of the calibrated stress and the acceleration time-series load spectrum of the battery pack by the weld fatigue solver engine, the simulated structural stress close to the actual structural stress corresponding to the battery pack support frame weld during driving on the target planned route can be quickly obtained.

[0087] In some possible embodiments, the fatigue life includes the number of operating lives in which the welds corresponding to the connection area between the battery pack support frame and the frame are damaged during cyclic operation within the target planned route; predicting the fatigue life of the welds corresponding to the connection area between the battery pack support frame and the frame based on the simulated structural stress and strain fatigue life curve may include: determining the number of operating cycles corresponding to the simulated structural stress value on the strain fatigue life curve based on the simulated structural stress and strain fatigue life curve, and using the number of operating cycles as the number of operating lives in which the welds corresponding to the connection area between the battery pack support frame and the frame are damaged during cyclic operation within the target planned route.

[0088] It should be noted that, since the route of the electric dump truck when transporting materials is "loading place-unloading place-loading place", the number of lifespans is twice the number of round trips of the electric dump truck on the target planned route, that is, between "loading place and unloading place".

[0089] Here, in order to establish a connection between the fatigue life of the welds of the battery pack support frame on the electric dump truck and the number of times the electric dump truck cycles back and forth within the target planned route, the fatigue life is selected as the number of operating lifespans at which the welds corresponding to the connection area between the battery pack support frame and the frame are damaged during cyclic operation within the target planned route, so that the staff can pay attention to whether the welds corresponding to the connection area between the battery pack support frame and the frame are damaged based on the prediction results and the number of times the electric dump truck cycles back and forth within the target planned route; in addition, the fatigue life is selected as the number of operating lifespans at which the welds corresponding to the connection area between the battery pack support frame and the frame are damaged during cyclic operation within the target planned route, which can also facilitate the prediction of the amount of material transported by the electric dump truck before the welds of the battery pack support frame are damaged.

[0090] In order to verify that the fatigue life of the weld of the battery pack support frame predicted by the method provided in this application has a small deviation from the actual fatigue life of the weld of the battery pack support frame, the actual fatigue life of the weld of the battery pack support frame is also calculated here, see Figure 5 , the calculation method may include the following steps:

[0091] (1) The GPS signal data of the electric dump truck is collected through the GPS module on the electric dump truck to obtain the driving speed load spectrum of the electric dump truck within the target planning route, that is, "loading place-unloading place-loading place", and the mileage corresponding to the target planning route K1 = 38.3 kilometers is recorded;

[0092] (2) When fatigue damage occurs to the weld corresponding to the connection area between the battery pack support frame and the frame, the total mileage K2 on the instrument panel of the electric dump truck is 26993 kilometers;

[0093] (3) According to the kilometers and total mileage corresponding to the target planning route, the formula The maximum number of reciprocating runs of the electric dump truck on the target planned route is calculated, and the maximum number of reciprocating runs is used as the actual fatigue life; here, the actual fatigue life n1 is 703.2 cycles through calculation.

[0094] Based on the prediction of the present embodiment, the fatigue life n2 of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame is 786.8 cycles. It can be seen that the actual fatigue life n1 is close to the predicted fatigue life n2. That is, the difference between the actual fatigue life n1 and the predicted fatigue life n2 is within the preset threshold, which meets the reasonableness of the comparison prediction, and can prove that the prediction method is effective.

[0095] The above method can not only quickly predict the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the frame, but also predict the amount of material transported by the electric dump truck before the weld of the battery pack support frame is damaged.

[0096] In some possible embodiments, the strain fatigue life curve is obtained by the following method:

[0097] S510: Apply a preset load to the weld finite element model to obtain a simulated stress set corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame.

[0098] The simulated stress set includes a simulated reaction force and a simulated reaction moment in the X direction, a simulated reaction force and a simulated reaction moment in the Y direction, and a simulated reaction force and a simulated reaction moment in the Z direction.

[0099] Here, the preset load can be a preset acceleration, so that the weld in the weld finite element model after the preset acceleration is applied generates corresponding accelerations in the X direction, Y direction and Z direction. Then, based on the weld finite element model after the preset acceleration is applied, the simulated reaction force and simulated reaction moment in the X direction, the simulated reaction force and simulated reaction moment in the Y direction, and the simulated reaction force and simulated reaction moment in the Z direction corresponding to the weld in the connection area between the battery pack support frame and the frame can be simulated.

[0100] S520. Based on the simulated stress set and the acceleration time series load spectrum, obtain the simulated structural stress corresponding to the weld.

[0101] Here, based on the simulated stress set and the acceleration time series load spectrum, the simulated structural stress corresponding to the weld can be obtained with reference to steps S310 and S320.

[0102] S530: Obtain a strain fatigue life curve based on the simulated structural stress and the weld structure corresponding to the weld corresponding to the connection area between the battery pack support frame and the vehicle frame.

[0103] By adopting the above method, the strain fatigue life curve corresponding to the weld structure of the battery pack weld can be obtained based on the simulated structural stress and the weld structure corresponding to the connection area between the battery pack support frame and the frame. This can enable the strain fatigue life curve corresponding to the weld structure of the battery pack weld to be realized, so that the strain fatigue life curve can relatively accurately predict the fatigue life of the battery pack weld.

[0104] In some possible embodiments, constructing a finite element model of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame may include the following steps:

[0105] S610: Build an initial finite element model corresponding to the connection area between the battery pack support frame and the vehicle frame.

[0106] S620. Based on the ASME specification, the weld, weld toe, weld leg and weld throat in the initial finite element model are modified to obtain a modified finite element model.

[0107] Here, when the weld in the initial finite element model is corrected based on the ASME specification, the correction can be made by pointing the weld unit normal outward, that is, the weld unit normal points to the welder; when the weld toe in the initial finite element model is corrected based on the ASME specification, the correction can be made by the method that the weld toe unit node is on the straight line used to express the weld toe; when the weld leg in the initial finite element model is corrected based on the ASME specification, the correction can be made by determining the weld leg length by the actual weld toe size, such as the weld leg length Lw is the sum of the thicknesses t1 and t2 of the two plates being welded; when the weld throat in the initial finite element model is corrected based on the ASME specification, the correction can be made by determining the weld throat thickness by the weld leg length, such as the weld throat thickness is .

[0108] In this step, the welds, weld toes, weld legs, and weld throats in the initial finite element model are modified based on the ASME specification so that the welds in the modified finite element model can better simulate the welds corresponding to the connection area between the battery pack support frame and the frame.

[0109] S630: Assign the weight of the battery pack to the position corresponding to the battery pack support frame in the modified finite element model to obtain a final weld finite element model.

[0110] Here, the position corresponding to the battery pack support frame in the modified finite element model can be understood as the corresponding position of the support frame where the weight of the battery pack can be coupled.

[0111] By adopting the above method, by correcting the weld, weld toe, weld leg and weld throat in the initial finite element model based on the ASME specification, and assigning the weight of the battery pack to the position corresponding to the battery pack support frame in the corrected finite element model, a weld finite element model with a small deviation from the actual weld corresponding to the connection area between the battery pack support frame and the vehicle frame can be constructed, so as to ensure that the constructed weld finite element model has the advantages of accurate simulation results and high simulation precision.

[0112] In some possible embodiments, the acceleration time series load spectrum of the battery pack is determined according to the acceleration corresponding to the battery pack during the operation of the electric dump truck along the target planned route.

[0113] Here, the acceleration corresponding to the battery pack of the electric dump truck during the operation of the target planned route can be understood as the acceleration actually detected by the acceleration monitoring sensor installed on the battery pack during the operation of the electric dump truck along the target planned route; wherein, the acceleration here can be the acceleration of the battery pack in three dimensions (XYZ).

[0114] In this embodiment, by determining the acceleration time-series load spectrum of the battery pack according to the acceleration corresponding to the battery pack during the operation of the electric dump truck on the target planned route, the deviation between the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the frame calculated based on the stress set and the acceleration time-series load spectrum of the battery pack and the actual structural stress corresponding to the weld can be reduced to ensure the accuracy of the simulated structural stress.

[0115] Figure 6 FIG. 7 is a schematic diagram of a device 700 for predicting the weld life of a battery pack support frame according to an embodiment of the present invention. The device 700 is applied to an electric dump truck, which includes a battery pack support frame and a vehicle frame. Figure 6 As shown, the apparatus 700 includes:

[0116] A finite element model building module 710 is used to build a finite element model of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame;

[0117] a stress set determination module 720 for performing finite element simulation on the weld finite element model based on acceleration information corresponding to the battery pack created for the target planned route to obtain a stress set corresponding to the weld; the stress set includes reaction forces and reaction moments in the X direction, reaction forces and reaction moments in the Y direction, and reaction forces and reaction moments in the Z direction;

[0118] a simulated structural stress calculation module 730 for calculating the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame based on the stress set and the acceleration time series load spectrum of the battery pack;

[0119] The life prediction module 740 is used to predict the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the frame based on the simulated structural stress and strain fatigue life curve.

[0120] In some implementations, the simulation structure stress calculation module 730 includes:

[0121] A calculation unit is used to input the stress set and the acceleration time series load spectrum of the battery pack into the weld fatigue solver engine for calculation, and obtain the initial simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame;

[0122] The first correction unit is used to correct the initial simulation structure stress according to a preset correction method to obtain the final simulation structure stress; the preset correction method includes at least one of a stress combination method, an average stress correction method, a survival rate setting method and a multi-axis estimation method.

[0123] In some implementations, the stress set and the acceleration time series load spectrum of the battery pack are input into the weld fatigue solver engine for calculation to obtain the initial simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame, including:

[0124] Based on the stress set, the weld fatigue solver engine calculates the calibrated stress corresponding to the weld in the area where the battery pack support frame connects to the vehicle frame. The calibrated stress includes membrane stress and bending stress.

[0125] The initial simulation structural stress is obtained based on the calculation of the calibration stress and the acceleration time series load spectrum of the battery pack by the weld fatigue solver engine.

[0126] In some implementations, the fatigue life includes the number of operating lives during which a weld corresponding to the connection area between the battery pack support frame and the vehicle frame is damaged during cyclic operation within a target planned route; the life prediction module 740 includes:

[0127] The fatigue life prediction unit is used to determine the number of operating cycles corresponding to the simulated structural stress value on the strain fatigue life curve based on the simulated structural stress and strain fatigue life curve, so as to use the number of operating cycles as the number of operating life times at which the weld corresponding to the connection area between the battery pack support frame and the frame is damaged during cyclic operation within the target planned route.

[0128] In some implementations, the apparatus 700 further includes a strain fatigue life curve construction module, and the strain fatigue life curve construction module includes:

[0129] A simulated stress collection unit is used to apply a preset load to the weld finite element model to obtain a simulated stress collection corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame. The simulated stress collection includes simulated reaction forces and simulated reaction moments in the X direction, simulated reaction forces and simulated reaction moments in the Y direction, and simulated reaction forces and simulated reaction moments in the Z direction.

[0130] A simulated structural stress obtaining unit is used to obtain the simulated structural stress corresponding to the weld based on the simulated stress set and the acceleration time series load spectrum;

[0131] The curve generating unit is used to obtain a strain fatigue life curve based on the simulated structural stress and the weld structure corresponding to the weld corresponding to the connection area between the battery pack support frame and the frame.

[0132] In some implementations, the finite element model building module 710 includes:

[0133] An initial finite element model building unit, used to build an initial finite element model corresponding to the connection area between the battery pack support frame and the vehicle frame;

[0134] The second correction unit is used to correct the weld, weld toe, weld leg and weld throat in the initial finite element model based on the ASME specification to obtain a corrected finite element model.

[0135] The weight assignment unit is used to assign the weight of the battery pack to the position corresponding to the battery pack support frame in the modified finite element model to obtain the final weld finite element model.

[0136] In some possible implementations, the acceleration time-series load spectrum of the battery pack is determined based on the acceleration information and stress information corresponding to the battery pack during the operation of the electric dump truck on the target planned route; the stress information is the measured stress corresponding to the battery pack in the X direction, Y direction and Z direction respectively.

[0137] It should be understood that the embodiment of the device for predicting the weld life of the battery pack support frame and the embodiment of the method for predicting the weld life of the battery pack support frame may correspond to each other, and similar descriptions may refer to the embodiment of the method for predicting the weld life of the battery pack support frame. To avoid repetition, they will not be described here. Specifically, Figure 6 The device 700 shown can execute the above-mentioned embodiment of the weld life prediction method for the battery pack support frame, and the aforementioned and other operations and / or functions of the various modules of the device 700 are respectively for realizing the corresponding processes in the above-mentioned weld life prediction method for the battery pack support frame. For the sake of brevity, they will not be repeated here.

[0138] The above describes the device 700 of the embodiment of the present invention from the perspective of functional modules in conjunction with the accompanying drawings. It should be understood that the functional module can be implemented in the form of hardware, can be implemented by instructions in the form of software, and can also be implemented by a combination of hardware and software modules. Specifically, the various steps of the embodiment of the method for predicting the life of the weld seam of the battery pack support frame and the detection method in the embodiment of the present invention can be completed by the hardware integrated logic circuit and / or software instructions in the processor. The steps of the method for predicting the life of the weld seam of the battery pack support frame and the detection method disclosed in the embodiment of the present invention can be directly embodied as being executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. Optionally, the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the embodiment of the method for predicting the life of the weld seam of the battery pack support frame and the detection method in combination with its hardware.

[0139] Figure 7 is a schematic block diagram of an electronic device 110 according to an embodiment of the present invention.

[0140] like Figure 7 As shown, the electronic device 110 may include:

[0141] The memory 111 and the processor 112 are configured to store computer programs and transmit the program code to the processor 112. In other words, the processor 112 can call and run the computer program from the memory 111 to implement the method in the embodiment of the present invention.

[0142] For example, the processor 112 may be configured to execute the above method embodiments according to instructions in the computer program.

[0143] In some embodiments of the present invention, the electronic device 110 may include but is not limited to:

[0144] General-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0145] In some embodiments of the present invention, the memory 111 includes but is not limited to:

[0146] Volatile memory and / or non-volatile memory. Non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus random access memory (DR RAM).

[0147] In some embodiments of the present invention, the computer program may be divided into one or more modules, which are stored in the memory 111 and executed by the processor 112 to implement the method provided by the present invention. The one or more modules may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program in the controller.

[0148] like Figure 7 As shown, the electronic device 110 may further include:

[0149] The transceiver 113 may be connected to the processor 112 or the memory 111 .

[0150] The processor 112 may control the transceiver 113 to communicate with other devices. Specifically, the processor 112 may send information or data to other devices or receive information or data sent by other devices. The transceiver 113 may include a transmitter and a receiver. The transceiver 113 may further include one or more antennas.

[0151] It should be understood that the various components in the electronic device are connected via a bus system, wherein the bus system includes not only a data bus but also a power bus, a control bus and a status signal bus.

[0152] The present invention also provides a computer storage medium having a computer program stored thereon. When the computer program is executed by a computer, the computer is enabled to perform the method of the above-mentioned method embodiment. Alternatively, one embodiment of the present invention further provides a computer program product containing instructions. When the computer is executed by the instructions, the computer is enabled to perform the method of the above-mentioned method embodiment.

[0153] 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 instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiments of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that integrates one or more available media. The available medium can be magnetic media (e.g., floppy disk, hard disk, magnetic tape), optical media (e.g., Digital Video Disc (DVD)), or semiconductor media (e.g., Solid State Drive (SSD)).

[0154] Those skilled in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0155] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules is merely a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0156] Modules described as separate components may or may not be physically separate, and components displayed as modules may or may not be physical modules, i.e., they may be located in one place or distributed across multiple network elements. Some or all of the modules may be selected based on actual needs to achieve the purpose of the present embodiment. For example, the functional modules in the various embodiments of the present application may be integrated into a processing module, or each module may exist physically separately, or two or more modules may be integrated into a single module.

[0157] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for predicting the weld life of a battery pack support frame, applied to an electric dump truck, wherein the electric dump truck comprises a battery pack support frame and a vehicle frame, characterized in that: The method comprises: Constructing a finite element model of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame; Based on the acceleration information corresponding to the battery pack created for the target planned route, a finite element simulation is performed on the weld finite element model to obtain a stress set corresponding to the weld; the stress set includes a reaction force and reaction moment in the X direction, a reaction force and reaction moment in the Y direction, and a reaction force and reaction moment in the Z direction; Calculating the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame based on the stress set and the acceleration time series load spectrum of the battery pack; Predicting the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame based on the simulated structural stress and strain fatigue life curve; The step of calculating the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame based on the stress set and the acceleration time series load spectrum of the battery pack includes: Inputting the stress set and the acceleration time series load spectrum of the battery pack into the weld fatigue solver engine for calculation, thereby obtaining the initial simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame; Correcting the initial simulated structural stress according to a preset correction method to obtain a final simulated structural stress; the preset correction method includes at least one of a stress combination method, a mean stress correction method, a survival rate setting method, and a multi-axis estimation method; In the weld fatigue solving engine, calculation can be performed using the following formula: in, is the combination coefficient; To solve for the engine scale factor, ; is the material stress bias, ; is the material proportional coefficient, ; is the load proportionality factor, ; is the stress bias, ; is the calibration stress; is the divisor coefficient, ; is the acceleration time series load spectrum of the battery pack.

2. The method for predicting the weld life of a battery pack support frame according to claim 1, characterized in that: The step of inputting the stress set and the acceleration time series load spectrum of the battery pack into a weld fatigue solver engine for calculation to obtain the initial simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame includes: Based on the stress set, the weld fatigue solver engine is used to calculate and obtain a calibration stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame; the calibration stress includes membrane stress and bending stress; The initial simulated structural stress is obtained based on the calculation of the calibrated stress and the acceleration time series load spectrum of the battery pack by the weld fatigue solving engine.

3. The method for predicting the weld life of a battery pack support frame according to claim 1, characterized in that: The fatigue life includes the number of times the weld corresponding to the connection area between the battery pack support frame and the vehicle frame is damaged during cyclic operation within the target planned route; The predicting, based on the simulated structural stress and strain fatigue life curve, the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame includes: Based on the simulated structural stress and the strain fatigue life curve, the number of operating cycles corresponding to the simulated structural stress value on the strain fatigue life curve is determined, so that the number of operating cycles is used as the number of operating lifespans at which the weld corresponding to the connection area between the battery pack support frame and the vehicle frame is damaged during cyclic operation within the target planned route.

4. The method for predicting the weld life of a battery pack support frame according to claim 1, characterized in that: The strain fatigue life curve is obtained by the following method: Applying a preset load to the weld finite element model to obtain a simulated stress set corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame; the simulated stress set includes a simulated reaction force and simulated reaction moment in the X direction, a simulated reaction force and simulated reaction moment in the Y direction, and a simulated reaction force and simulated reaction moment in the Z direction; Obtaining a simulated structural stress corresponding to the weld based on the simulated stress set and the acceleration time series load spectrum; The strain fatigue life curve is obtained based on the simulated structural stress and the weld structure corresponding to the weld corresponding to the connection area between the battery pack support frame and the frame.

5. The method for predicting the weld life of a battery pack support frame according to claim 1, characterized in that: The step of constructing a finite element model of a weld corresponding to the connection area between the battery pack support frame and the vehicle frame includes: Constructing an initial finite element model corresponding to the connection area between the battery pack support frame and the vehicle frame; Correcting the weld, weld toe, weld leg, and weld throat in the initial finite element model based on the ASME specification to obtain a corrected finite element model; The weight of the battery pack is assigned to the position corresponding to the battery pack support frame in the modified finite element model to obtain the final finite element model of the weld.

6. The method for predicting the weld life of a battery pack support frame according to claim 1, characterized in that: The acceleration time-series load spectrum of the battery pack is determined based on the acceleration information and stress information corresponding to the battery pack during the operation of the electric dump truck on the target planned route; the stress information is the measured stress corresponding to the battery pack in the X direction, Y direction and Z direction respectively.

7. A device for predicting the weld life of a battery pack support frame, applied to an electric dump truck, which includes a battery pack support frame and a vehicle frame, characterized in that: The device comprises: A finite element model building module, used to build a finite element model of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame; a stress set determination module, configured to perform finite element simulation on the weld finite element model based on acceleration information corresponding to the battery pack created for the target planned route, to obtain a stress set corresponding to the weld; the stress set includes reaction forces and reaction moments in the X direction, reaction forces and reaction moments in the Y direction, and reaction forces and reaction moments in the Z direction; a simulated structural stress calculation module, configured to calculate the simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame based on the stress set and the acceleration time series load spectrum of the battery pack; a life prediction module, configured to predict the fatigue life of the weld corresponding to the connection area between the battery pack support frame and the vehicle frame based on the simulated structural stress and strain fatigue life curve; Wherein, the simulation structure stress calculation module includes: a calculation unit, configured to input the stress set and the acceleration time series load spectrum of the battery pack into a weld fatigue solver engine for calculation, and obtain an initial simulated structural stress corresponding to the weld in the connection area between the battery pack support frame and the vehicle frame; a first correction unit, configured to correct the initial simulated structural stress according to a preset correction method to obtain a final simulated structural stress; the preset correction method includes at least one of a stress combination method, a mean stress correction method, a survival rate setting method, and a multi-axis estimation method; In the weld fatigue solving engine, calculation can be performed using the following formula: in, is the combination coefficient; To solve for the engine scale factor, ; is the material stress bias, ; is the material proportional coefficient, ; is the load proportionality factor, ; is the stress bias, ; is the calibration stress; is the divisor coefficient, ; is the acceleration time series load spectrum of the battery pack.

8. An electronic device, characterized in that: include: A processor and a memory, the memory being used to store a computer program, and the processor being used to call and run the computer program stored in the memory to execute the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that Used to store a computer program, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 6.

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