Test method of low-temperature charging performance, electronic equipment and storage medium

Abstract

The application discloses a low-temperature charging performance test method, an electronic device and a storage medium, and relates to the technical field of vehicle safety. The method comprises the following steps: constructing a low-temperature charging test environment of a to-be-tested vehicle; placing the to-be-tested vehicle in an environment simulation device, and controlling the environment simulation device to execute a preset temperature simulation process; obtaining temperature balance state information of the to-be-tested vehicle under a target low-temperature environment, and collecting initial state information of a power battery and vehicle system state information after the to-be-tested vehicle reaches a preset temperature balance condition; controlling a charging device to execute a preset charging process on the to-be-tested vehicle, and collecting charging process data; determining a comprehensive evaluation index of the to-be-tested vehicle under a low-temperature condition, and outputting a low-temperature charging performance evaluation result based on the comprehensive evaluation index. The application can effectively test the charging performance of the vehicle under the low-temperature condition, and improve the accuracy and comparability of the low-temperature charging test result.

Description

Technical Field

[0001] This application relates to the technical field of automotive safety, and in particular to a method for testing low-temperature charging performance, an electronic device, and a storage medium. Background Technology

[0002] With the widespread application of electric vehicles powered by batteries, charging performance in low-temperature environments has become a crucial factor affecting the user experience. Under low-temperature conditions, the acceptable charging capacity of electric batteries decreases, leading to slower charging speeds, reduced charging efficiency, and more complex temperature control.

[0003] In related technologies, low-temperature charging tests are typically conducted on the vehicle under test using an environmental chamber and charging equipment, and parameters such as charging time, charging current, or charging power are recorded and analyzed. However, existing testing schemes generally suffer from problems such as inconsistent test condition settings, insufficient control over the initial temperature balance of the vehicle, inadequate process data collection, and relatively singular evaluation indicators, making it difficult to comprehensively and accurately reflect the charging performance of the vehicle in actual low-temperature scenarios. Summary of the Invention

[0004] One objective of this application is to provide a method, electronic device, and storage medium for testing low-temperature charging performance, aiming to address the difficulty of the prior art in comprehensively and accurately reflecting the charging performance of vehicles in actual low-temperature scenarios.

[0005] In a first aspect, embodiments of this application provide a method for testing low-temperature charging performance, comprising: A low-temperature charging test environment is constructed for the vehicle under test, the test environment including an environmental simulation device, a charging device and a data acquisition device; The vehicle under test is placed inside the environmental simulation device, and the environmental simulation device is controlled to perform a preset temperature simulation process to create a target low-temperature environment; Under the target low temperature environment, the temperature balance state information of the vehicle under test is obtained, and after the vehicle under test reaches the preset temperature balance condition, the initial state information of the power battery and the state information of the vehicle system are collected. Based on the initial state information of the power battery and the state information of the vehicle system, the charging device is controlled to perform a preset charging process on the vehicle under test, and charging process data is collected by the data acquisition device. Based on the charging process data, a comprehensive evaluation index for the vehicle under test under low temperature conditions is determined, and a low-temperature charging performance evaluation result is output based on the comprehensive evaluation index.

[0006] In conjunction with the first aspect, in one possible implementation, the preset temperature simulation process includes a low-temperature parking simulation stage and a charging state simulation stage. The low-temperature parking simulation stage is used to simulate the low-temperature parking conditions of the vehicle, and the pre-charging state simulation stage is used to simulate the environmental conditions in which the vehicle is located before charging.

[0007] In conjunction with the first aspect, in one possible implementation, obtaining the temperature equilibrium state information of the vehicle under test includes: Acquire temperature data from multiple locations in the power battery or the vehicle, and determine whether the vehicle under test has reached the preset temperature equilibrium condition based on the temperature differences at these multiple locations.

[0008] In conjunction with the first aspect, in one possible implementation, the vehicle system status information includes at least the battery management system status, the thermal management system status, and the charging system status. The step of controlling the charging device to perform a preset charging process for the vehicle under test based on the initial state information of the power battery and the state information of the vehicle system includes: Charging is initiated when the vehicle system status information meets preset conditions.

[0009] In conjunction with the first aspect, in one possible implementation, the initial state information of the power battery includes at least the state of charge, temperature state, and health state of the power battery. The step of controlling the charging device to perform a preset charging process for the vehicle under test based on the initial state information of the power battery and the state information of the vehicle system includes: A charging control strategy is determined based on the initial state information of the power battery and the state information of the vehicle system, and the charging power is adjusted based on the charging control strategy.

[0010] In conjunction with the first aspect, in one possible implementation, the charging process data includes at least one of the following: power battery voltage, power battery current, power battery temperature, charging power, and thermal management-related parameters.

[0011] In conjunction with the first aspect, in one possible implementation, the acquisition of charging process data via the data acquisition device includes: The charging process data is collected according to the basic sampling mode; When a preset event is detected, the system switches to enhanced sampling mode to collect charging process data; the preset event includes at least one of abnormal changes in power battery voltage, abnormal changes in power battery temperature, and abnormal changes in charging power.

[0012] In conjunction with the first aspect, in one possible implementation, the comprehensive evaluation index includes at least charging speed, charging efficiency, and temperature stability; The step of determining the comprehensive evaluation index of the vehicle under test under low-temperature conditions based on the charging process data includes: The charging speed is determined based on the change in charging energy per unit time. The charging efficiency is determined based on the relationship between the input electrical energy and the electrical energy absorbed by the power battery. The temperature stability is determined based on the temperature change characteristics of the power battery during charging.

[0013] In a second aspect, embodiments of this application also provide an electronic device, comprising: one or more processors; a memory; and a computer program stored in the memory and executable by the one or more processors, wherein, when the computer program is executed by the one or more processors, the electronic device performs the low-temperature charging performance testing method described in any of the first aspects.

[0014] In a third aspect, embodiments of this application also propose a computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the method for testing low-temperature charging performance as described in any of the first aspects.

[0015] The embodiments of this application can achieve the following technical effects: On one hand, the low-temperature charging speed testing method provided in this application constructs a low-temperature charging test environment including an environmental simulation device, a charging device, and a data acquisition device, and controls the environmental simulation device to execute a preset temperature simulation process, thereby placing the vehicle under test in a uniform and controllable target low-temperature environment for testing. This approach effectively reduces the impact of external environmental fluctuations on test results, improves the consistency and repeatability of low-temperature charging test conditions, and thus enhances the reliability and comparability of test results.

[0016] On the other hand, this application acquires the temperature equilibrium state information of the vehicle under test under a target low-temperature environment, and after the vehicle under test reaches the preset temperature equilibrium condition, it collects the initial state information of the power battery and the vehicle system state information, and then executes the subsequent charging process. This ensures that the vehicle under test enters the test under a relatively consistent initial low-temperature state. Through this process, test deviations caused by uneven temperature distribution of the power battery, the vehicle not yet being stably cooled, or inconsistent system states can be reduced, thereby improving the ability of the low-temperature charging test results to reflect the actual charging performance of the vehicle.

[0017] On the other hand, this application controls the charging device to execute a preset charging process based on the initial state information of the power battery and the vehicle system state information. This ensures that the charging test process is not only related to the state of charge, temperature, and health of the power battery, but also matched with the states of the battery management system, thermal management system, and charging system. Therefore, the test process more closely reflects the actual operating logic of the vehicle during low-temperature charging, enhancing the realism and engineering applicability of the test scheme, and facilitating the accurate reflection of the vehicle's charging response characteristics under low-temperature conditions.

[0018] On the other hand, this application collects charging process data such as power battery voltage, power battery current, power battery temperature, charging power, and thermal management-related parameters during the charging process, and determines comprehensive evaluation indicators based on the charging process data, thereby enabling a multi-dimensional assessment of the low-temperature charging performance of the vehicle under test. This method not only obtains the charging speed but also allows for a comprehensive analysis of vehicle performance by combining indicators such as charging efficiency and temperature stability. Compared to evaluation methods that only use charging time or a single power parameter, this approach provides a more comprehensive reflection of the vehicle's charging performance under low-temperature conditions. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A schematic flowchart illustrating a method for testing low-temperature charging performance provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0021] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0022] The low-temperature charging performance testing method described in this application embodiment can be executed by a test control system. The test control system can be deployed in a host computer, industrial computer, server, or dedicated test terminal, and establish communication connections with the environmental simulation device, charging device, and data acquisition device to achieve functions such as low-temperature operating condition construction, test process control, test data acquisition, and performance evaluation output.

[0023] Please refer to Figure 1 The method for testing low-temperature charging performance provided in this application includes steps S10-S50: Step S10: Construct a low-temperature charging test environment for the vehicle under test. The test environment includes an environmental simulation device, a charging device, and a data acquisition device. Step S20: Place the vehicle under test inside the environmental simulation device and control the environmental simulation device to perform a preset temperature simulation process to create a target low-temperature environment; Step S30: Under the target low temperature environment, acquire the temperature balance state information of the vehicle under test, and after the vehicle under test reaches the preset temperature balance condition, collect the initial state information of the power battery and the state information of the vehicle system. Step S40: Based on the initial state information of the power battery and the state information of the vehicle system, control the charging device to perform a preset charging process on the vehicle under test, and collect charging process data through the data acquisition device; Step S50: Based on the charging process data, determine the comprehensive evaluation index of the vehicle under test under low temperature conditions, and output the low temperature charging performance evaluation result based on the comprehensive evaluation index.

[0024] The environmental simulation device is used to construct the low-temperature environment in which the vehicle under test is located. It can be an environmental chamber, a low-temperature experimental chamber, or other equipment that can achieve temperature regulation and temperature maintenance. The charging device is used to provide charging power to the vehicle under test. It can be an AC charging device or a DC charging device, preferably a charging pile that can output stable test power and has communication functions.

[0025] The data acquisition device is used to collect vehicle status data, charging data, and environmental data during the test process, and may include one or more of the following: an on-board bus acquisition module, an external sensor acquisition module, a multi-channel sampling module, and a data recording module.

[0026] In this embodiment, the vehicle under test can be parked inside the environmental simulation device, and the following connections can be made: The charging device is connected to the charging interface of the vehicle under test; the data acquisition device is connected to the data interface of the vehicle under test to obtain status data of the power battery, battery management system, thermal management system and vehicle control system; the data acquisition device can also be connected to the charging device and the environmental simulation device to synchronously acquire the output data of the charging equipment and the ambient temperature data; the test control system is communicatively connected to the environmental simulation device, the charging device and the data acquisition device to achieve unified control.

[0027] The above configuration can form a complete low-temperature charging test environment, providing a foundation for subsequent low-temperature simulation and charging tests.

[0028] After placing the vehicle under test inside the environmental simulation device, the environmental simulation device is controlled to perform a preset temperature simulation process to create a target low-temperature environment.

[0029] In this embodiment, the target low-temperature environment can be set to a preset temperature value, such as 0℃, -10℃, -20℃, etc., or it can be set to a certain low-temperature range. This application does not limit this.

[0030] Specifically, the test control system can send temperature control commands to the environmental simulation device, causing the device to operate according to a preset cooling curve until the interior of the environmental chamber reaches and stabilizes at the target temperature. To improve test consistency, the ambient temperature change curve, holding time, and temperature fluctuations inside the chamber can be recorded simultaneously during the environmental simulation process, serving as the basic environmental data for the test.

[0031] In this embodiment, temperature equilibrium information is used to characterize whether the vehicle under test or the power battery has fully adapted to the target low-temperature environment, that is, whether the internal temperature distribution of the vehicle or the power battery has reached a relatively stable state. The test control system can acquire temperature data from multiple temperature measurement points inside the power battery pack through a data acquisition device, or acquire temperature data from multiple locations in the vehicle, such as battery pack temperature, temperature of key components inside the compartment, and temperature of relevant locations in the thermal management circuit.

[0032] After determining that the vehicle under test has reached the preset temperature equilibrium condition, the following information is further collected: 1. Initial state information of the power battery The initial state information of the power battery may include, but is not limited to: The battery's state of charge (SOC); battery temperature status, such as average temperature, maximum temperature, minimum temperature, and temperature difference; battery state of health (SOH); battery allowable charging current or allowable charging power; and battery voltage status.

[0033] 2. Vehicle system status information The vehicle system status information may include, but is not limited to: Battery management system status; thermal management system status; charging system status; vehicle controller related status; high voltage power-on status or pre-charge status; fault codes or system abnormal status.

[0034] This embodiment collects the initial state information after the vehicle under test has reached the preset temperature equilibrium condition, which makes the starting conditions of the test more uniform and reduces the result deviation caused by the temperature not yet being stable or the system state being inconsistent.

[0035] In this embodiment, the test control system can first perform a pre-test judgment based on the initial state information of the power battery and the vehicle system state information, for example, judging that: Is the current SOC within the preset test range? Is the battery management system in a state that allows charging? Does the thermal management system meet the operating conditions? Has the charging system completed the communication handshake? Are there any fault conditions that affect the test?

[0036] When the test start conditions are met, the charging device is controlled to start charging. The preset charging process can be a fixed strategy charging process or a charging process dynamically adjusted based on the vehicle status. For example, charging can be performed according to a target power, target current, or a staged control method, and the vehicle's charging response can be continuously tracked during the charging process.

[0037] At the same time, data acquisition devices continuously collect data during the charging process. The collected data may include: Power battery voltage; power battery current; power battery temperature; charging power; ambient temperature; thermal management related parameters; system status switching information; fault or alarm information.

[0038] In this embodiment, the test control system can filter, clean, time-align, and statistically analyze the collected charging process data, and extract key indicators for evaluating low-temperature charging performance. The comprehensive evaluation indicators may include at least: Charging speed; charging efficiency; temperature stability.

[0039] Furthermore, the test control system can compare various indicators with preset evaluation rules and output one or more of the following evaluation results: Numerical results of indicators; evaluation results of sub-items; comprehensive scoring results; graphical test report; vehicle low-temperature charging performance level.

[0040] The method described in this embodiment enables low-temperature charging performance testing of vehicles under test in a uniform low-temperature environment and under uniform conditions, and achieves standardized control of the testing process and multi-dimensional evaluation of the test results.

[0041] Furthermore, in this embodiment, the preset temperature simulation process includes a low-temperature parking simulation stage and a pre-charging state simulation stage: The low-temperature parking simulation phase is used to simulate the low-temperature parking conditions of vehicles.

[0042] Specifically, after the vehicle under test enters the environmental simulation device, the ambient temperature can be gradually adjusted to the target low temperature and maintained for a preset duration, allowing the vehicle to undergo a cooling process similar to that of actual winter parking. This stage helps the power battery, body structure, and related systems gradually enter a low-temperature state, avoiding deviations between the test conditions and actual usage scenarios caused by abrupt cooling methods.

[0043] The pre-charging state simulation phase is used to simulate the environmental conditions in which the vehicle is located before charging.

[0044] Specifically, after completing the low-temperature parking simulation, the vehicle under test can be kept in the target low-temperature environment and in a pre-set charging state for a predetermined period of time. During this stage, the vehicle can be in a parked state with the engine off, in a hibernation standby state, or in a state where the system is allowed to wake up but charging has not yet started, so that the test can more closely resemble the actual application scenario of a vehicle being parked in a low-temperature environment and ready to charge.

[0045] This embodiment, by setting the low-temperature parking simulation stage and the charging state simulation stage, allows the vehicle under test to experience a more complete low-temperature pre-condition, thereby improving the authenticity and engineering reference significance of the low-temperature charging test.

[0046] Furthermore, in some embodiments, obtaining the temperature balance state information of the vehicle under test includes: obtaining temperature data from multiple locations of the power battery or the entire vehicle, and determining whether the vehicle under test has reached the preset temperature balance condition based on the temperature differences at the multiple locations.

[0047] Specifically, the data acquisition device can acquire at least one of the following temperature data: Temperatures at multiple measurement points within the power battery pack; temperature of the power battery inlet or outlet cooling circuit; temperature inside the passenger compartment; temperature of key parts of the vehicle body; ambient temperature within the environmental simulation device.

[0048] The test control system can determine temperature balance based on temperature differences at multiple locations. For example, one or more of the following methods can be used: Determine whether the maximum temperature difference between multiple temperature measurement points is less than a preset threshold; determine whether the temperature change rate of each temperature measurement point within a continuous preset time is less than a preset threshold; determine whether the difference between the average temperature of the power battery and the ambient temperature is less than a preset range; determine whether the temperature changes at multiple key locations of the vehicle tend to stabilize.

[0049] When all or some of the above conditions are met, it can be determined that the vehicle under test has reached the preset temperature equilibrium condition.

[0050] Compared with methods that rely solely on a single temperature measurement point or a single temperature value, this embodiment can more comprehensively reflect the stable state of the entire vehicle or power battery in a low-temperature environment, thereby improving the accuracy of the test start condition judgment.

[0051] In some embodiments, the vehicle system status information includes at least the battery management system status, the thermal management system status, and the charging system status.

[0052] The battery management system status may include whether charging is allowed, whether a fault code exists, whether a charging current limit is given, and whether high voltage preparation is completed. The thermal management system status may include heater operating status, liquid cooling circulation status, refrigerant system status, heat pump system status, or system availability status. The charging system status may include charging gun connection status, handshake communication status, insulation detection status, charging preparation status, and fault status.

[0053] The step of controlling the charging device to perform a preset charging process on the vehicle under test based on the initial state information of the power battery and the state information of the vehicle system includes: starting charging when the state information of the vehicle system meets preset conditions.

[0054] The preset conditions may include at least one of the following: The battery management system is in a charging-enabled state; the thermal management system is in an operational state or meets the preset thermal management activation conditions; the charging system has completed the communication handshake and allowed energy input; there are no fault conditions in the vehicle that would affect the test; the high-voltage system is ready to be powered on.

[0055] When the above preset conditions are met, the test control system controls the charging device to start charging; if not met, the charging is temporarily suspended, and the unmet items can be recorded, prompt messages can be issued, or an exception handling process can be executed.

[0056] This embodiment improves test safety and the validity of results by pre-judging the vehicle system status information, thus avoiding direct charging tests when the system status is abnormal or the conditions are not met.

[0057] In some embodiments, the initial state information of the power battery includes at least the state of charge, temperature, and health status of the power battery.

[0058] Wherein: the state of charge can be SOC or equivalent available power; the temperature state can include the average temperature, maximum temperature, minimum temperature and temperature difference of the power battery; the health state can be SOH, or parameters that characterize battery degradation, internal resistance changes and acceptable charging capacity.

[0059] The step of controlling the charging device to perform a preset charging process for the vehicle under test based on the initial state information of the power battery and the state information of the vehicle system includes: determining a charging control strategy based on the initial state information of the power battery and the state information of the vehicle system, and adjusting the charging power based on the charging control strategy.

[0060] Specifically, the test control system can determine the charging control strategy based on the following information: Initial SOC of the power battery; initial temperature of the power battery; SOH of the power battery; allowable charging current of the battery management system; current operating mode of the thermal management system; maximum output capacity of the charging device.

[0061] For example, when the initial temperature of the power battery is low, the charging control strategy can be set to low-power charging to avoid the battery being subjected to excessive charging load at low temperatures; when the temperature of the power battery gradually rises after the thermal management system is running, the charging control strategy can be switched to medium-power or high-power charging; when the SOC is close to the high charge range, the charging power can be reduced to meet battery safety and control requirements; when the system detects a decrease in the allowable charging current or limited thermal management capabilities, the charging power can be limited or adjusted in stages.

[0062] This embodiment dynamically determines the charging control strategy based on the initial state of the battery and the state of the vehicle system, which makes the low-temperature charging test more consistent with the real vehicle control logic, thereby more accurately reflecting the vehicle's charging capability in low-temperature scenarios.

[0063] In some embodiments, the charging process data includes at least one of the following: power battery voltage, power battery current, power battery temperature, charging power, and thermal management related parameters.

[0064] The power battery voltage may include the individual cell voltage, the total voltage, or a statistical value of a certain voltage; the power battery current may include the real-time charging current, the average current, or the fluctuation value within a certain time interval; the power battery temperature may include the temperatures of multiple temperature measurement points, the average temperature, the highest temperature, the lowest temperature, and their rate of change; and the charging power may include the real-time power, the average power, and the peak power.

[0065] The thermal management related parameters may include, but are not limited to: battery heater on status; heating power; cooling pump operating status; fan operating status; valve switching status; heat pump or refrigerant circuit operating status; and coolant temperature and flow rate.

[0066] In practical applications, the test control system can flexibly select one or more of the above data as charging process data based on the vehicle communication protocol, sampling hardware capabilities, and test objectives.

[0067] This embodiment, by collecting voltage, current, temperature, power, and thermal management parameters, can comprehensively reflect the changes in electrical performance, thermal behavior, and system collaborative control process during low-temperature charging, providing a data foundation for subsequent evaluation.

[0068] In some embodiments, the acquisition of charging process data through the data acquisition device includes: The charging process data is collected according to the basic sampling mode; when a preset event is detected, the charging process data is collected by switching to the enhanced sampling mode.

[0069] The preset events include at least one of the following: abnormal changes in power battery voltage, abnormal changes in power battery temperature, and abnormal changes in charging power.

[0070] Specifically, the basic sampling mode can be used for data recording during the regular testing phase. Its sampling frequency can be set to meet the needs of general test analysis, thereby reducing data storage pressure and improving overall test execution efficiency. The enhanced sampling mode can be used during critical change phases, with a sampling frequency higher than the basic sampling mode, to obtain data with higher temporal resolution.

[0071] In this embodiment, the test control system can monitor the collected data in real time, and trigger the enhanced sampling mode when at least one of the following conditions is detected: The voltage of the power battery changes beyond a first threshold within a preset time window; The temperature of the power battery changes beyond the second threshold within a preset time window; The charging power changes beyond the third threshold within a preset time window.

[0072] For example, rapid changes in voltage, current, temperature, or power may occur at the moment of charging start-up, during the rapid power ramp-up phase, during the intervention phase of the thermal management system, or during the current limiting switching phase of the vehicle. At this time, the system can automatically switch to the enhanced sampling mode to improve the recording accuracy of key process information.

[0073] Once the preset event ends or the relevant parameters return to the preset stable range, the data acquisition device can return to the basic sampling mode.

[0074] This embodiment combines a basic sampling mode with an enhanced sampling mode, which can effectively improve the data acquisition capability of key dynamic processes while taking into account data processing efficiency.

[0075] In some embodiments, the comprehensive evaluation indicators include at least charging speed, charging efficiency, and temperature stability.

[0076] The step of determining the comprehensive evaluation index of the vehicle under test under low-temperature conditions based on the charging process data includes: In this embodiment, charging speed can be characterized by the change in input energy per unit time, the change in SOC, or the average charging power. For example, the increase in input energy within a certain charging time window can be statistically analyzed, or the time taken from the initial SOC to the target SOC range can be calculated, thereby reflecting the vehicle's ability to receive charging energy under low-temperature conditions.

[0077] In this embodiment, the input electrical energy can be obtained by integrating the output power of the charging device over time, and the electrical energy absorbed by the power battery can be calculated from the battery-side voltage, current, and time data. By comparing the relationship between the input electrical energy and the effective electrical energy absorbed by the power battery, the low-temperature charging efficiency index can be obtained.

[0078] In some scenarios, if the thermal management system consumes significant energy during low-temperature charging, this indicator can also reflect the impact of thermal management intervention on the overall charging energy utilization efficiency.

[0079] In this embodiment, temperature stability can be evaluated based on the temperature change characteristics of the power battery during charging, for example: Temperature rise rate; change in the difference between the highest and lowest temperatures; temperature fluctuation amplitude; convergence or divergence trend of temperature difference during charging; temperature control stability after intervention of the thermal management system.

[0080] The parameters mentioned above can be used to assess whether the thermal response of the power battery is stable during low-temperature charging, whether the thermal management control is effective, and whether the local temperature rise or temperature difference expansion is obvious.

[0081] After determining the charging speed, charging efficiency, and temperature stability, the test control system can further normalize, weight, or classify each indicator, and output the low-temperature charging performance evaluation results.

[0082] The evaluation results may include: individual indicator results; comprehensive evaluation results; low-temperature charging performance level; test conclusions and recommendations.

[0083] This embodiment enables multi-dimensional quantitative analysis of the low-temperature charging performance of the vehicle under test, allowing the evaluation results to not only reflect how fast the charging is, but also how stable and efficient the charging is.

[0084] Further, see Figure 2 , Figure 2This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. The computer device includes one or more processors 31 and a memory 32. The memory 32 is connected to one or more processors 31, for example, via a bus.

[0085] Processor 31 is configured to support the computer device in executing the methods described in the above method embodiments. Processor 31 may be a central processing unit (CPU), a network processor (NP), a hardware chip, or any combination thereof. The aforementioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The aforementioned PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0086] Memory 32 is used to store program code, etc. Memory 32 may include volatile memory (VM), such as random access memory (RAM); memory 32 may also include non-volatile memory (NVM), such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid-state drive (SSD); memory 32 may also include combinations of the above types of memory.

[0087] The memory 32 can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the central controller in the embodiments of this application. The processor 31 implements the methods provided in the above embodiments by running the non-volatile software programs, instructions, and modules stored in the memory 32.

[0088] The memory 32 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function. These remote memories can be connected to other component modules via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0089] One or more modules are stored in memory 32. When executed by one or more processors 31, they perform the manufacturing method in any of the above method embodiments. For example, they perform the method steps described in the above method embodiments to realize the functions described in the above embodiments.

[0090] This application also provides a computer-readable storage medium storing a computer program, the computer program including program instructions, which, when executed by a computer, cause the computer to perform the method as described in the foregoing embodiments.

[0091] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

[0092] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0093] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0094] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0095] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for testing low-temperature charging performance, characterized in that, include: A low-temperature charging test environment is constructed for the vehicle under test, the test environment including an environmental simulation device, a charging device and a data acquisition device; The vehicle under test is placed inside the environmental simulation device, and the environmental simulation device is controlled to perform a preset temperature simulation process to create a target low-temperature environment; Under the target low temperature environment, the temperature balance state information of the vehicle under test is obtained, and after the vehicle under test reaches the preset temperature balance condition, the initial state information of the power battery and the state information of the vehicle system are collected. Based on the initial state information of the power battery and the state information of the vehicle system, the charging device is controlled to perform a preset charging process on the vehicle under test, and charging process data is collected by the data acquisition device. Based on the charging process data, a comprehensive evaluation index for the vehicle under test under low temperature conditions is determined, and a low-temperature charging performance evaluation result is output based on the comprehensive evaluation index.

2. The method for testing low-temperature charging performance according to claim 1, characterized in that, The preset temperature simulation process includes a low-temperature parking simulation stage and a charging state simulation stage. The low-temperature parking simulation stage is used to simulate the low-temperature parking conditions of the vehicle, and the pre-charging state simulation stage is used to simulate the environmental conditions in which the vehicle is located before charging.

3. The method for testing low-temperature charging performance according to claim 1, characterized in that, The step of obtaining the temperature equilibrium state information of the vehicle under test includes: Acquire temperature data from multiple locations in the power battery or the vehicle, and determine whether the vehicle under test has reached the preset temperature equilibrium condition based on the temperature differences at these multiple locations.

4. The method for testing low-temperature charging performance according to claim 1, characterized in that, The vehicle system status information includes at least the battery management system status, thermal management system status, and charging system status. The step of controlling the charging device to perform a preset charging process for the vehicle under test based on the initial state information of the power battery and the state information of the vehicle system includes: Charging is initiated when the vehicle system status information meets preset conditions.

5. The method for testing low-temperature charging performance according to claim 1, characterized in that, The initial state information of the power battery includes at least the state of charge, temperature, and health status of the power battery. The step of controlling the charging device to perform a preset charging process for the vehicle under test based on the initial state information of the power battery and the state information of the vehicle system includes: A charging control strategy is determined based on the initial state information of the power battery and the state information of the vehicle system, and the charging power is adjusted based on the charging control strategy.

6. The method for testing low-temperature charging performance according to claim 1, characterized in that, The charging process data includes at least one of the following: power battery voltage, power battery current, power battery temperature, charging power, and thermal management related parameters.

7. The method for testing low-temperature charging performance according to claim 1, characterized in that, The process of collecting charging process data through the data acquisition device includes: The charging process data is collected according to the basic sampling mode; When a preset event is detected, the system switches to enhanced sampling mode to collect charging process data; the preset event includes at least one of abnormal changes in power battery voltage, abnormal changes in power battery temperature, and abnormal changes in charging power.

8. The method for testing low-temperature charging performance according to claim 1, characterized in that, The comprehensive evaluation indicators include at least charging speed, charging efficiency, and temperature stability. The step of determining the comprehensive evaluation index of the vehicle under test under low-temperature conditions based on the charging process data includes: The charging speed is determined based on the change in charging energy per unit time. The charging efficiency is determined based on the relationship between the input electrical energy and the electrical energy absorbed by the power battery. The temperature stability is determined based on the temperature change characteristics of the power battery during charging.

9. An electronic device, characterized in that, include: One or more processors; Memory; And a computer program stored in the memory and executable by the one or more processors, wherein when the computer program is executed by the one or more processors, the electronic device performs the test method for low-temperature charging performance as described in any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for testing low-temperature charging performance as described in any one of claims 1 to 8.

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