Battery life test method and device

Abstract

The invention provides a battery life testing method and device. The battery life test method comprises the following steps: loading a test current to a to-be-tested battery and obtaining the voltage of the to-be-tested battery under the test current to obtain an initial voltage; enabling the to-be-tested battery to run for a preset test duration according to a preset simulation working condition, so as to obtain a simulated battery; loading a test current to the simulated battery, and obtaining the voltage of the simulated battery under the test current to obtain a result voltage; and acquiring a voltage attenuation condition according to the initial voltage and the result voltage, and evaluating the service life of the to-be-tested battery according to the voltage attenuation condition. Through the technical scheme provided by the invention, the technical problem that the service life test accuracy of the air-cooled fuel cell for the two-wheeled vehicle is relatively low in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a battery life testing method and device. Background Art

[0002] At present, most electric two-wheelers are powered by lithium batteries, which have problems such as long charging time, short battery life in low temperature environments, and high safety requirements in high temperature environments. Hydrogen-powered two-wheelers use hydrogen as energy storage, which can be quickly recharged by changing bottles, and do not have the problem of short battery life in low temperature environments, making them more suitable for daily use.

[0003] However, in the prior art, the service life test of automotive fuel cells is usually based on the actual operating conditions of road vehicles, simulating the fuel cell life test condition spectrum, and using test equipment to perform fuel cell life tests. However, the fuel cells that two-wheeled vehicles need to be equipped with are relatively small in power, and mostly use air-cooled fuel cells. Their actual operating conditions are quite different from those of road vehicles, and the speed limits on urban roads and rural roads are different. Therefore, this existing life evaluation method is difficult to simulate the actual operating conditions of electric two-wheeled vehicles, and thus difficult to use for the life test of air-cooled fuel cells for two-wheeled vehicles. Summary of the invention

[0004] The main purpose of the present invention is to provide a battery life test method and device to solve the technical problem of low accuracy in the life test of air-cooled fuel cells for two-wheeled vehicles in the prior art.

[0005] In order to achieve the above object, according to one aspect of the present invention, a battery life test method is provided, comprising:

[0006] Loading a test current to the battery to be tested and obtaining the voltage of the battery to be tested under the test current to obtain an initial voltage;

[0007] The battery to be tested is operated for a preset test time according to a preset simulation working condition to obtain a simulated battery;

[0008] Loading a test current to the simulated completed battery and obtaining a voltage of the simulated completed battery under the test current to obtain a result voltage;

[0009] Obtaining voltage decay conditions according to the initial voltage and the result voltage, so as to evaluate the life of the battery to be tested according to the voltage decay conditions;

[0010] Among them, the preset simulation operating conditions include a first operating condition corresponding to the vehicle's low-speed operation mode and a second operating condition corresponding to the vehicle's high-speed operation mode. The first operating condition is to make the battery to be tested operate at a first power, and the second operating condition is to make the battery to be tested operate at a second power; the first power is greater than or equal to 90W and less than or equal to 110W, and / or the second power is greater than or equal to 140W and less than or equal to 160W.

[0011] Furthermore, the first preset duration is shorter than the second preset duration;

[0012] The step of operating the battery to be tested at a first power includes: operating the battery to be tested intermittently at a first simulation mode and a second simulation mode; wherein the first simulation mode is to operate the battery to be tested at the first power for a first preset time, and the second simulation mode is to operate the battery to be tested at the first power for a second preset time; and / or,

[0013] The step of operating the battery to be tested at the second power includes: operating the battery to be tested intermittently at a third simulation mode and a fourth simulation mode; wherein the third simulation mode is to operate the battery to be tested at the second power for a first preset time, and the fourth simulation mode is to operate the battery to be tested at the second power for a second preset time; and / or,

[0014] The method of causing the battery to be tested to run for a preset test time according to a preset simulated working condition includes: causing the battery to be tested to run for a preset test time in a cycle according to a preset simulated working condition.

[0015] Further, the battery to be tested is made to run a preset test time according to a preset simulation condition, including:

[0016] Allowing the battery to be tested to operate at a first power for a first simulation time;

[0017] Allowing the battery to be tested to operate at a second power for a second simulation time period;

[0018] Allowing the battery to be tested to operate at the first power for a third simulation time period;

[0019] Allowing the battery to be tested to operate at the second power for a fourth simulation time period;

[0020] Among them, the first simulation duration is shorter than the third simulation duration; and the second simulation duration is shorter than the fourth simulation duration.

[0021] Further, the first simulation duration is equal to the second simulation duration; and / or, the third simulation duration is equal to the fourth simulation duration.

[0022] Furthermore, the first simulation duration is greater than or equal to 5 minutes and less than or equal to 10 minutes;

[0023] The second simulation duration is greater than or equal to 5 minutes and less than or equal to 10 minutes;

[0024] The duration of the third simulation is greater than or equal to 30 minutes and less than or equal to 60 minutes;

[0025] The fourth simulation duration is greater than or equal to 30 minutes and less than or equal to 60 minutes.

[0026] Furthermore, before the battery to be tested is operated at the first power for the first simulation time, the battery life test method further includes: placing the battery to be tested in an open circuit state; performing a load operation on the battery to be tested in the open circuit state and placing the battery to be tested in an idle power supply state; and / or,

[0027] Before operating the battery to be tested at the first power for a third simulation time period, the battery life test method further includes: performing a load reduction operation on the battery to be tested and placing the battery to be tested in an idle power supply state.

[0028] Furthermore, the first test current is a current when the battery to be tested operates at a first power; the second test current is a current when the battery to be tested operates at a second power; and the test current is applied to the battery to be tested and a voltage of the battery to be tested under the test current is obtained, including:

[0029] Loading a first test current to the battery to be tested and obtaining a voltage of the battery to be tested under the first test current to obtain a first initial voltage; loading a second test current to the battery to be tested and obtaining a voltage of the battery to be tested under the second test current to obtain a second initial voltage;

[0030] Loading a test current to the simulated finished battery and obtaining the voltage of the simulated finished battery under the test current, including:

[0031] A first test current is loaded to the simulated completed battery and the voltage of the simulated completed battery under the first test current is obtained to obtain a first result voltage; a second test current is loaded to the simulated completed battery and the voltage of the simulated completed battery under the second test current is obtained to obtain a second result voltage.

[0032] Furthermore, the voltage attenuation condition includes a voltage attenuation rate and / or a voltage attenuation velocity; obtaining the voltage attenuation condition according to the initial voltage and the result voltage includes:

[0033] Obtaining a voltage decay rate and / or a voltage decay speed of the battery to be tested at a first power according to the first initial voltage and the first result voltage;

[0034] The voltage decay rate and / or voltage decay speed of the battery to be tested at the second power is obtained according to the second initial voltage and the second result voltage.

[0035] According to another aspect of the present invention, a battery life test device is provided, which is applicable to the battery life test method provided above, and the battery life test device comprises:

[0036] A first acquisition module, used for loading a test current to the battery to be tested and acquiring a voltage of the battery to be tested under the test current to obtain an initial voltage;

[0037] The working condition simulation module is used to make the battery to be tested run according to the preset simulation working condition for the preset test time to obtain a simulated battery;

[0038] A second acquisition module is used to load a test current to the simulated completed battery and obtain the voltage of the simulated completed battery under the test current to obtain a result voltage;

[0039] The data processing module is used to obtain the voltage decay situation according to the initial voltage and the result voltage, so as to evaluate the life of the battery to be tested according to the voltage decay situation.

[0040] Furthermore, the battery life test device also includes:

[0041] A gas flow control module, used to control the flow of hydrogen gas input into the battery to be tested; and / or,

[0042] A gas pressure control module, used to control the pressure of hydrogen gas input into the battery to be tested; and / or,

[0043] The fan-type stack cooling module is used to control the flow rate of air input into the battery to be tested and to adjust the temperature of the battery to be tested so that the battery to be tested is within the optimal operating temperature range.

[0044] By applying the technical solution of the present invention, the battery to be tested can be operated under preset simulated working conditions, including a first working condition corresponding to the low-speed operation mode of the vehicle and a second working condition corresponding to the high-speed operation mode of the vehicle, so as to more truly reflect the performance of the battery in actual application. This helps to accurately evaluate the life of the battery under typical use conditions and improve the accuracy of the battery life test. The preset simulation working conditions and test duration settings avoid too many invalid tests. At the same time, by operating at key power points, the performance attenuation of the battery under specific conditions can be efficiently detected, thereby improving the overall test efficiency and the accuracy of the results. Secondly, the set first power and second power correspond to the battery power requirements when the vehicle is running at low speed and high speed, respectively. This setting can comprehensively test the performance of the battery under low load and high load conditions, ensuring the comprehensiveness and reliability of the test results. Thirdly, by comparing the voltage data before and after the test and obtaining the voltage attenuation, the degree of battery performance degradation can be quantified. This method provides an objective evaluation standard, which helps to identify whether the battery life meets certain standards, and is of great significance for battery maintenance and management. In addition, by making the battery to be tested run for a preset test time according to a preset simulated working condition, different preset test times can be selected according to specific evaluation requirements, thereby improving the applicability of the battery life test method and enhancing the applicability and flexibility of the test method. Therefore, the technical solution of the present invention can solve the technical problem of low accuracy of life test of air-cooled fuel cells for two-wheeled vehicles in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0046] Figure 1 A schematic diagram showing the steps of a battery life test method provided in accordance with the first embodiment of the present invention;

[0047] Figure 2 A schematic diagram of a current variation over time under a preset simulation condition of a battery life test method provided in Embodiment 1 of the present invention is shown;

[0048] Figure 3 The actual operating condition diagram of a fuel cell for a two-wheeled vehicle is shown. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] like Figure 1 and Figure 2As shown, a first embodiment of the present invention provides a battery life test method, which includes: loading a test current to a battery to be tested and obtaining the voltage of the battery to be tested under the test current to obtain an initial voltage; allowing the battery to be tested to run for a preset test time according to a preset simulation condition to obtain a simulated completed battery; loading a test current to the simulated completed battery and obtaining the voltage of the simulated completed battery under the test current to obtain a result voltage; obtaining a voltage attenuation condition according to the initial voltage and the result voltage to evaluate the life of the battery to be tested according to the voltage attenuation condition; wherein the preset simulation condition includes a first condition corresponding to a low-speed operation mode of the vehicle and a second condition corresponding to a high-speed operation mode of the vehicle, the first condition is to allow the battery to be tested to run at a first power, and the second condition is to allow the battery to be tested to run at a second power; the first power is greater than or equal to 90W and less than or equal to 110W, and / or the second power is greater than or equal to 140W and less than or equal to 160W.

[0051] The battery life test method provided by the first embodiment of the present invention can more realistically reflect the performance of the battery in actual application by running the battery to be tested under preset simulated working conditions, including a first working condition corresponding to the low-speed operation mode of the vehicle and a second working condition corresponding to the high-speed operation mode of the vehicle. This helps to accurately evaluate the life of the battery under typical use conditions and improve the accuracy of the battery life test. The preset simulation working conditions and test duration settings avoid too many invalid tests. At the same time, by running at key power points, the performance attenuation of the battery under specific conditions can be efficiently detected, thereby improving the overall test efficiency and the accuracy of the results. Secondly, the set first power and second power correspond to the battery power requirements when the vehicle is running at low speed and high speed, respectively. This setting can comprehensively test the performance of the battery under low load and high load conditions, ensuring the comprehensiveness and reliability of the test results. Thirdly, by comparing the voltage data before and after the test, the voltage attenuation is obtained, and the degree of battery performance degradation can be quantified. This method provides an objective evaluation standard, which helps to identify whether the battery life meets certain standards, and is of great significance for battery maintenance and management. In addition, by making the battery to be tested run for a preset test time according to a preset simulated working condition, different preset test times can be selected according to specific evaluation requirements, thereby improving the applicability of the battery life test method and enhancing the applicability and flexibility of the test method. Therefore, the battery life test method provided by this embodiment can solve the technical problem of low accuracy of life test of air-cooled fuel cells for two-wheeled vehicles in the prior art.

[0052] It should be noted that "vehicle low-speed operation mode" refers to a mode in which the vehicle operates within a first speed range, and the first speed range is 10km / h to 20km / h (including 10km / h and 20km / h). "Vehicle high-speed operation mode" refers to a mode in which the vehicle operates within a second speed range, and the second speed range is 20km / h to 25km / h (including 20km / h and 25km / h). The first operating condition can correspond to the vehicle low-speed operation mode, and the second operating condition can correspond to the vehicle high-speed operation mode, which is obtained based on the actual operating condition data of the vehicle acquired in advance.

[0053] Specifically, the vehicle is a two-wheeled vehicle.

[0054] Specifically, the battery to be tested is an air-cooled fuel cell.

[0055] Specifically, the first power is 100W, and the second power is 150W.

[0056] Specifically, the first preset duration is less than the second preset duration; the method for making the battery to be tested run at the first power includes: making the battery to be tested run intermittently according to the first simulation mode and the second simulation mode; wherein the first simulation mode is to make the battery to be tested run at the first power for the first preset duration, and the second simulation mode is to make the battery to be tested run at the first power for the second preset duration. With such a setting, by setting different running durations (i.e., the first preset duration and the second preset duration), the intermittent load changes of the battery in actual use can be simulated more carefully. The combination of the first simulation mode and the second simulation mode enables the test method to reflect the performance of the battery under short-term and long-term low-power operation, which helps to comprehensively evaluate the durability and stability of the battery under specific load conditions.

[0057] Specifically, the first preset duration is less than the second preset duration; the method for making the battery to be tested operate at the second power includes: making the battery to be tested operate intermittently according to the third simulation mode and the fourth simulation mode; wherein the third simulation mode is to make the battery to be tested operate at the second power for the first preset duration, and the fourth simulation mode is to make the battery to be tested operate at the second power for the second preset duration. With such a setting, the intermittent load changes of the battery when operating at high power are simulated through the third and fourth simulation modes. Different operating time settings help to evaluate the behavioral characteristics of the battery under high-intensity use, including its thermal stability, rapid response capability, and long-lasting performance at high power. This provides important data for the design and application of batteries, especially in scenarios where high power output of the battery is required, such as when a two-wheeled vehicle is climbing a slope or driving at high speed.

[0058] Specifically, the battery to be tested is made to run for a preset test time according to a preset simulated working condition, including: making the battery to be tested run for a preset test time in a cycle according to a preset simulated working condition. With such a setting, different preset test times can be selected according to specific evaluation requirements, thereby improving the applicability of the battery life test method and enhancing the applicability and flexibility of the test method. By cyclically running the preset simulated working conditions, the test method can simulate the various load changes experienced by the battery in the actual use environment. This cycle test can not only accelerate the aging process of the battery, thereby evaluating its long-term performance in a shorter time, but also ensure the repeatability and reliability of the test results, making the evaluation of battery life more accurate. In addition, the cycle test can also reveal the attenuation law of battery performance under continuously changing load conditions, providing a scientific basis for the formulation of battery management strategies.

[0059] In this embodiment, the method for making the battery to be tested run a preset test time according to a preset simulation working condition includes: making the battery to be tested run for a first simulation time at a first power; making the battery to be tested run for a second simulation time at a second power; making the battery to be tested run for a third simulation time at the first power; making the battery to be tested run for a fourth simulation time at the second power; wherein the first simulation time is less than the third simulation time; and the second simulation time is less than the fourth simulation time. It should be noted that the above four steps are run in sequence. With such a setting, the load changes encountered by the battery in the actual use of the two-wheeled vehicle can be more realistically simulated. This simulation not only includes frequent starting and stopping during low-speed driving in the city, but also includes long-term high-power output during high-speed driving in the countryside, thereby ensuring that the test conditions are highly consistent with the actual use scenario. By cyclically testing at low power and high power, as well as in short and long-term operation, the performance data of the battery under different working conditions can be obtained. This comprehensive data set helps to gain a deep understanding of the performance boundaries of the battery, including its efficiency at low load and stability at high load, and provides a scientific basis for battery maintenance, usage scenario selection and life prediction. Compared with the traditional test method which may require long-term continuous operation or single-condition operation, the test method in this embodiment can obtain effective results in a shorter time through a carefully designed combination of power and duration. This not only saves test time, but also reduces the resource consumption required for the test, thereby improving the overall test efficiency.

[0060] like Figure 2 As shown, Figure 2The broken line portion corresponding to "1" is "making the battery to be tested run at the first power for the first simulation duration", and the first simulation duration is (t2-t1)s. The broken line portion corresponding to "2" is "making the battery to be tested run at the second power for the second simulation duration", and the second simulation duration is (t3-t2)s. The broken line portion corresponding to "3" is "making the battery to be tested run at the first power for the third simulation duration", and the third simulation duration is (t5-t4)s. The broken line portion corresponding to "4" is "making the battery to be tested run at the second power for the fourth simulation duration", and the fourth simulation duration is (t6-t5)s. I1 is the current magnitude loaded in the battery to be tested when the battery to be tested runs at the first power. I2 is the current magnitude loaded in the battery to be tested when the battery to be tested runs at the second power. The broken line portion corresponding to "1" and the broken line portion corresponding to "2" are the conditions where the fuel cell runs for a short time and changes load at high and low power points (the first power and the second power), which are used to simulate the short-term riding and acceleration conditions of a two-wheeled vehicle on an urban road. The broken line portion corresponding to "3" and the broken line portion corresponding to "4" represent the conditions where the fuel cell operates for a long time at high and low power points with variable loads, which are used to simulate the long-term riding conditions of a two-wheeled vehicle at high and low speeds on rural roads.

[0061] It should be noted that in actual operation, the speed of two-wheeled vehicles on urban roads is in the range of 10km / h to 20km / h, and the speed on rural roads is in the range of 20km / h to 25km / h. Figure 3 As shown, Figure 3 The line graph in the upper middle part (corresponding to the Pwr_Run part) shows the change of the average operating power of the two-wheeled vehicle battery during actual operation. Figure 3 The line graph in the lower middle part (corresponding to the part of Pwr_Max) indicates the change of the maximum power of the battery for two-wheeled vehicles during actual operation. In the actual operating conditions of two-wheeled vehicles, the frequency of occurrence of the battery power of the first power and the second power is relatively high. In addition, the speed limits of two-wheeled vehicles in cities and rural roads are different. Two-wheeled vehicles have more start-stop speed changes in urban road conditions, and have a longer period of high-power operation in rural road conditions. Therefore, "the first simulation duration of the battery to be tested running at the first power" is used to simulate the short-term driving of the two-wheeled vehicle in urban road conditions. "The second simulation duration of running the battery to be tested at the second power" is used to simulate the short-term driving of the two-wheeled vehicle in rural road conditions. "The third simulation duration of running the battery to be tested at the first power" is used to simulate the long-term driving of the two-wheeled vehicle in urban road conditions. "The fourth simulation duration of running the battery to be tested at the second power" is used to simulate the long-term driving of the two-wheeled vehicle in rural road conditions.

[0062] Specifically, the first simulation duration is equal to the second simulation duration. In this way, by ensuring that the first simulation duration is equal to the second simulation duration, the method can achieve balanced working conditions in the test and avoid the impact of a certain working condition being too long on the test results. This balance helps to more accurately evaluate the stability and performance consistency of the battery at low power, and can ensure that the impact on the battery at each stage of the test process is comparable.

[0063] Specifically, the third simulation duration is equal to the fourth simulation duration. In this way, by ensuring that the third simulation duration is equal to the fourth simulation duration, the method can achieve the balance of working conditions in the test and avoid the influence of a certain working condition that is too long on the test results. This balance helps to more accurately evaluate the stability and performance consistency of the battery at low power, and can ensure that the impact on the battery at each stage of the test process is comparable.

[0064] Specifically, the first simulation duration is greater than or equal to 5 minutes and less than or equal to 10 minutes; the second simulation duration is greater than or equal to 5 minutes and less than or equal to 10 minutes; the third simulation duration is greater than or equal to 30 minutes and less than or equal to 60 minutes; the fourth simulation duration is greater than or equal to 30 minutes and less than or equal to 60 minutes. With such a setting, by setting a clear range of simulation durations, the test method can ensure that the actual operating requirements in different scenarios are covered in the battery life test. Short-term operation of 5 to 10 minutes simulates frequent starts and stops in urban driving, while long-term operation of 30 to 60 minutes simulates continuous high-speed driving on rural roads or highways. The choice of this time range helps to comprehensively evaluate the transient response capability and long-term performance of the battery, ensuring that the test results can reflect the performance of the battery in actual use.

[0065] Specifically, the first simulation duration is 5 minutes. The second simulation duration is 5 minutes. The third simulation duration is 30 minutes. The fourth simulation duration is 30 minutes. With such a setting, the simulation duration is determined to be a fixed value (5 minutes and 30 minutes), making the test method highly repeatable and comparable. This not only ensures consistency between different tests and reduces the variability of test results, but also simplifies test operations and reduces test costs. For battery manufacturers and researchers, this standardized testing process helps to quickly and accurately evaluate the performance and life of batteries under specific operating conditions, thereby accelerating the product development and improvement process.

[0066] In this embodiment, before the battery to be tested is operated at the first power for the first simulation time, the battery life test method further includes: placing the battery to be tested in an open circuit state; performing a load operation on the battery to be tested in the open circuit state and placing the battery to be tested in an idle power supply state. With such a setting, it is possible to ensure that the battery is in a stable and comparable initial state before the test begins. Placing the battery in an open circuit state can eliminate the influence of any previous load on the battery voltage state, ensuring that the test starts from a clear baseline. The subsequent load operation and placing the battery in an idle power supply state simulates the moment of starting and stable operation of a two-wheeled vehicle, which is crucial for evaluating the starting performance and stable power supply capability of the battery in actual use. This transition from open circuit to idle power supply can also test the response speed and efficiency of the battery under load changes, providing additional information for a comprehensive evaluation of battery performance.

[0067] In this embodiment, before the battery to be tested is operated at the first power for the third simulation time, the battery life test method further includes: performing a load reduction operation on the battery to be tested and placing the battery to be tested in an idle power supply state. This setting ensures that the battery can smoothly transition from a high power state to a low power state before a long-term low power operation test, thereby avoiding the unnatural effects of power mutations on battery life. Through this operation, the test method can more accurately simulate the load changes of the battery under actual working conditions, ensuring that the test results can reflect the performance and life of the battery in a real use environment.

[0068] It should be noted that the open circuit state means that there is no current flowing between the two poles of the battery to be tested. The idle power supply state refers to the state of the battery to be tested when the vehicle powered by the battery to be tested is in an idle running state. In the preset simulation conditions, the fuel cell is loaded from the open circuit to the idle point (equivalent to the idle power supply state), and after stabilization, the load is gradually changed to the low power point (equivalent to the first power) and the high power point (equivalent to the second power). After a short operation, the load is reduced to the idle point, and after stabilization, the load is gradually changed to the low power point and the high power point again, and it runs stably for a long time.

[0069] Specifically, the first test current is the current when the battery to be tested operates at the first power; the second test current is the current when the battery to be tested operates at the second power. The method of loading the test current to the battery to be tested and obtaining the voltage of the battery to be tested under the test current includes: loading the first test current to the battery to be tested and obtaining the voltage of the battery to be tested under the first test current to obtain a first initial voltage; loading the second test current to the battery to be tested and obtaining the voltage of the battery to be tested under the second test current to obtain a second initial voltage. The method of loading the test current to the simulated completed battery and obtaining the voltage of the simulated completed battery under the test current includes: loading the first test current to the simulated completed battery and obtaining the voltage of the simulated completed battery under the first test current to obtain a first result voltage; loading the second test current to the simulated completed battery and obtaining the voltage of the simulated completed battery under the second test current to obtain a second result voltage. With such a setting, since the frequency of occurrence of the battery power being the first power and the second power is high in the actual operating condition, by associating the first test current with the first power and the second test current with the second power, the method ensures that the test conditions correspond directly to the actual operating conditions. This precise match helps to obtain data that more truly reflects the battery performance, thereby improving the accuracy of battery life assessment. Secondly, such a setting makes it easy to obtain voltage attenuation. By loading the same current as the initial test to the simulated battery (i.e., the battery that has passed the preset simulated working conditions), the first result voltage and the second result voltage can be obtained. By comparing the initial voltage and the result voltage, the performance changes of the battery after aging can be quantified, including the voltage attenuation, which reflects the aging problems that the battery may encounter in actual use. Thirdly, by comparing the voltage changes of the battery at the first power and the second power, this embodiment can evaluate the sensitivity of the battery to different power requirements. This is crucial to understanding the performance differences between batteries under low-power and high-power operation, especially in application scenarios such as two-wheeled vehicles where the working conditions vary greatly.

[0070] Specifically, the voltage attenuation condition includes the voltage attenuation rate. The method for obtaining the voltage attenuation condition according to the initial voltage and the result voltage includes: obtaining the voltage attenuation rate of the battery to be tested at a first power according to the first initial voltage and the first result voltage; obtaining the voltage attenuation rate of the battery to be tested at a second power according to the second initial voltage and the second result voltage. In this way, the calculation of the voltage attenuation rate can intuitively reflect the degree of performance degradation of the battery at a specific power. By comparing the voltage attenuation rates at the first power and the second power, the stability and durability of the battery under different load conditions can be evaluated. This is crucial to understanding the behavior of the battery under changes in operating conditions that may be encountered in actual applications. The evaluation of the voltage attenuation rate helps to identify the key points of battery performance degradation and its impact on the efficiency and reliability of the entire battery system.

[0071] Specifically, the voltage decay condition includes the voltage decay rate. The method for obtaining the voltage decay condition according to the initial voltage and the result voltage includes: obtaining the voltage decay rate of the battery to be tested at a first power according to the first initial voltage and the first result voltage; obtaining the voltage decay rate of the battery to be tested at a second power according to the second initial voltage and the second result voltage. In this way, the voltage decay rate provides a performance degradation indicator in a time dimension, which measures the rate at which the battery voltage decreases over time. This evaluation method is of great significance for predicting the future performance and remaining service life of the battery. By comparing the voltage decay rates at different powers, it is possible to identify whether the battery has a faster degradation rate under high load conditions, which is crucial for battery life management and usage planning. In addition, the analysis of the voltage decay rate helps to optimize the battery's charging and discharging strategies to slow down performance degradation.

[0072] Specifically, the voltage decay condition includes a voltage decay rate and a voltage decay rate. The method for obtaining the voltage decay condition according to the initial voltage and the result voltage includes: obtaining the voltage decay rate and the voltage decay rate of the battery to be tested at a first power according to the first initial voltage and the first result voltage; obtaining the voltage decay rate and the voltage decay rate of the battery to be tested at a second power according to the second initial voltage and the second result voltage. With such a setting, combined with the dual evaluation of the voltage decay rate and the voltage decay rate, a more comprehensive insight into the battery aging process is provided. The voltage decay rate reveals the degree of performance degradation, while the voltage decay rate quantifies the degradation rate. This comprehensive evaluation method can more accurately predict the life of the battery and its performance at different powers, which is of great value for the optimization design of the battery, performance prediction, and the formulation of maintenance strategies. At the same time, this method can also help identify potential problems in battery design and promote the continuous improvement of battery technology.

[0073] Specifically, the method for evaluating the life of a battery to be tested includes: confirming that the life of the battery to be tested is qualified when the voltage decay rate of the battery to be tested at a first power is less than a first preset decay rate, the voltage decay rate of the battery to be tested at the first power is less than the first preset decay rate, the voltage decay rate of the battery to be tested at a second power is less than a second preset decay rate, and the voltage decay rate of the battery to be tested at the second power is less than the second preset decay rate.

[0074] Specifically, by comparing the voltage decay rate and voltage decay rate of the battery under test at the first power with the voltage decay rate and voltage decay rate of the battery under test at the second power, the sensitivity of the battery to different power requirements can be evaluated. If the voltage decay rate of the battery under the second power operation is significantly higher than the voltage decay rate under the first power operation, this may indicate that the battery needs to be designed to improve its high-power operation performance to improve overall life and reliability.

[0075] Specifically, the voltage decay rate provides information about the battery performance degradation trend over time. For example, if the battery voltage decay rate is already high in the early stages of testing, this may indicate that the overall life of the battery will be shorter than expected, requiring more frequent maintenance or replacement.

[0076] Specifically, combining the voltage decay rate and decay rate can predict the life of the battery under specific usage conditions. For example, if the voltage decay rate of the battery is lower at the second power and higher at the first power, this may mean that the battery life will be more affected under low-speed urban usage conditions, while the life under rural high-speed usage conditions will be relatively longer. This analysis is of great value in formulating battery usage strategies and optimizing vehicle design.

[0077] Specifically, the battery life test method includes: performing a performance calibration on the fuel cell (the calibration conditions can be customized), recording the voltage V1 corresponding to the current at the low power point I1 and the voltage V2 corresponding to the current at the high power point I2.

[0078] After running the fuel cell for a period of time according to the preset simulated working conditions, the fuel cell is calibrated again. The voltage V1' corresponding to the low power point I1 current of the fuel cell and the voltage V2' corresponding to the high power point I2 current are recorded, and the voltage decay rate at the low power point [100%*(V1-V1') / V1], the voltage decay rate at the low power point [(V1-V1') / total test time], and the voltage decay rate at the high power point [100%*(V2-V2') / V2], the voltage decay rate at the high power point [(V2-V2') / total test time] are calculated respectively. The service life of the fuel cell is evaluated by the voltage decay rate and decay rate.

[0079] Embodiment 2 of the present invention provides a battery life test device, which is applicable to the battery life test method provided in Embodiment 1, and the battery life test device includes a first acquisition module, a working condition simulation module, a second acquisition module and a data processing module. The first acquisition module is used to load a test current to the battery to be tested and obtain the voltage of the battery to be tested under the test current to obtain an initial voltage. The working condition simulation module is used to make the battery to be tested run for a preset test time according to a preset simulated working condition to obtain a simulated completed battery. The second acquisition module is used to load a test current to the simulated completed battery and obtain the voltage of the simulated completed battery under the test current to obtain a result voltage. The data processing module is used to obtain a voltage attenuation condition based on the initial voltage and the result voltage, so as to evaluate the life of the battery to be tested based on the voltage attenuation condition.

[0080] The battery life test device provided by the second embodiment of the present invention can more realistically reflect the performance of the battery in actual application by running the battery to be tested under preset simulated working conditions, including a first working condition corresponding to the low-speed operation mode of the vehicle and a second working condition corresponding to the high-speed operation mode of the vehicle. This helps to accurately evaluate the life of the battery under typical use conditions and improve the accuracy of the battery life test. The preset simulation working conditions and test duration settings avoid too many invalid tests. At the same time, by running at key power points, the performance attenuation of the battery under specific conditions can be efficiently detected, thereby improving the overall test efficiency and the accuracy of the results. Secondly, the set first power and second power correspond to the battery power requirements when the vehicle is running at low speed and high speed, respectively. This setting can comprehensively test the performance of the battery under low load and high load conditions, ensuring the comprehensiveness and reliability of the test results. Thirdly, by comparing the voltage data before and after the test, the voltage attenuation is obtained, and the degree of battery performance degradation can be quantified. This method provides an objective evaluation standard, which helps to identify whether the battery life meets certain standards, and is of great significance for battery maintenance and management. In addition, by making the battery to be tested run for a preset test time according to a preset simulated working condition, different preset test times can be selected according to specific evaluation requirements, thereby improving the applicability of the battery life test method and enhancing the applicability and flexibility of the test method. Therefore, the battery life test device provided by this embodiment can solve the technical problem of low accuracy of life test of air-cooled fuel cells for two-wheeled vehicles in the prior art.

[0081] Specifically, the battery life test device also includes a gas flow control module, which is used to control the flow of hydrogen gas input to the battery to be tested. With such a setting, by accurately controlling the flow of hydrogen gas input to the battery to be tested, the hydrogen supply of the fuel cell during operation is ensured to be stable, thereby maintaining the continuity and efficiency of the electrochemical reaction.

[0082] Specifically, the battery life test device also includes a gas pressure control module, which is used to control the pressure of hydrogen input to the battery to be tested. With such a setting, the pressure of hydrogen input to the battery to be tested can be maintained constant. Stable hydrogen pressure not only ensures the balance of hydrogen and oxygen reactions inside the battery stack, prevents unstable performance due to pressure fluctuations, but also avoids potential damage to the battery caused by high or low pressure.

[0083] Specifically, the battery life test device also includes a fan-type stack cooling module, which is used to control the flow rate of air input to the battery to be tested and to adjust the temperature of the battery to be tested so that the battery to be tested is within the optimal operating temperature range. With such a setting, the fan-type stack cooling module ensures that the battery to be tested operates within the optimal temperature range by controlling the air flow rate and adjusting the battery temperature, which is crucial for the performance and life test of the fuel cell.

[0084] Specifically, the battery life test device also includes a single cell voltage inspection module, which is used to monitor the single cell voltage of the battery stack to be tested in real time, so as to detect the voltage distribution and voltage change trend in the stack in real time.

[0085] Specifically, the battery life test device further includes a consumable electronic load module, which is used to control the operating power of the battery to be tested, so as to adjust the operating power of the battery to be tested according to demand.

[0086] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: based on the actual operating conditions of the two-wheeled vehicle, the power generation power of the air-cooled fuel cell is reasonably allocated, and combined with the actual speed limits of urban and rural roads, the life of the air-cooled fuel cell for the two-wheeled vehicle is reasonably evaluated.

[0087] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0088] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0089] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0090] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0091] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery life test method, characterized in that: include: Loading a test current to a battery to be tested and acquiring a voltage of the battery to be tested under the test current to obtain an initial voltage; Allowing the battery to be tested to run for a preset test time according to a preset simulation condition to obtain a simulated battery; Loading the test current to the simulated completed battery and acquiring the voltage of the simulated completed battery under the test current to obtain a result voltage; Acquiring a voltage decay condition according to the initial voltage and the result voltage, so as to evaluate the life of the battery to be tested according to the voltage decay condition; Among them, the preset simulation operating conditions include a first operating condition corresponding to a low-speed operation mode of the vehicle and a second operating condition corresponding to a high-speed operation mode of the vehicle. The first operating condition is to make the battery to be tested operate at a first power, and the second operating condition is to make the battery to be tested operate at a second power; the first power is greater than or equal to 90W and less than or equal to 110W, and / or the second power is greater than or equal to 140W and less than or equal to 160W.

2. The battery life test method according to claim 1, characterized in that: The first preset duration is shorter than the second preset duration; The step of operating the battery to be tested at the first power includes: operating the battery to be tested intermittently at a first simulation mode and a second simulation mode; wherein the first simulation mode is to operate the battery to be tested at the first power for the first preset time, and the second simulation mode is to operate the battery to be tested at the first power for the second preset time; and / or, The step of making the battery to be tested operate at the second power includes: making the battery to be tested operate intermittently in a third simulation mode and a fourth simulation mode; wherein the third simulation mode is to make the battery to be tested operate at the second power for the first preset time, and the fourth simulation mode is to make the battery to be tested operate at the second power for the second preset time; and / or, The step of causing the battery to be tested to run for a preset test time according to a preset simulated working condition includes: causing the battery to be tested to run for a preset test time in a cycle according to the preset simulated working condition.

3. The battery life testing method according to claim 1, characterized in that: The step of causing the battery to be tested to run for a preset test time according to a preset simulated working condition includes: Allowing the battery to be tested to operate at the first power for a first simulation time period; Allowing the battery to be tested to operate at the second power for a second simulation time period; Allowing the battery to be tested to operate at the first power for a third simulation time period; Allowing the battery to be tested to operate at the second power for a fourth simulation time period; Among them, the first simulation duration is shorter than the third simulation duration; and the second simulation duration is shorter than the fourth simulation duration.

4. The battery life test method according to claim 3, characterized in that: The first simulation duration is equal to the second simulation duration; and / or the third simulation duration is equal to the fourth simulation duration.

5. The battery life test method according to claim 3, characterized in that: The first simulation duration is greater than or equal to 5 minutes and less than or equal to 10 minutes; The second simulation duration is greater than or equal to 5 minutes and less than or equal to 10 minutes; The third simulation duration is greater than or equal to 30 minutes and less than or equal to 60 minutes; The fourth simulation duration is greater than or equal to 30 minutes and less than or equal to 60 minutes.

6. The battery life testing method according to claim 3, characterized in that: Before causing the battery to be tested to run at the first power for a first simulation time, the battery life test method further includes: placing the battery to be tested in an open circuit state; performing a load operation on the battery to be tested in the open circuit state and placing the battery to be tested in an idle power supply state; and / or, Before causing the battery to be tested to operate at the first power for a third simulation time period, the battery life test method further includes: performing a load reduction operation on the battery to be tested and placing the battery to be tested in an idle power supply state.

7. The battery life testing method according to claim 1, characterized in that: The first test current is the current when the battery to be tested operates at the first power; the second test current is the current when the battery to be tested operates at the second power; and the step of loading the test current to the battery to be tested and obtaining the voltage of the battery to be tested under the test current includes: Loading the first test current to the battery to be tested and obtaining the voltage of the battery to be tested under the first test current to obtain a first initial voltage; loading the second test current to the battery to be tested and obtaining the voltage of the battery to be tested under the second test current to obtain a second initial voltage; The step of loading the test current onto the simulated completed battery and obtaining the voltage of the simulated completed battery under the test current includes: The first test current is loaded to the simulated completed battery and the voltage of the simulated completed battery under the first test current is obtained to obtain a first result voltage; the second test current is loaded to the simulated completed battery and the voltage of the simulated completed battery under the second test current is obtained to obtain a second result voltage.

8. The battery life test method according to claim 7, characterized in that: The voltage attenuation condition includes a voltage attenuation rate and / or a voltage attenuation speed; and obtaining the voltage attenuation condition according to the initial voltage and the result voltage includes: Acquire a voltage decay rate and / or a voltage decay speed of the battery to be tested at the first power according to the first initial voltage and the first result voltage; The voltage decay rate and / or voltage decay speed of the battery to be tested at the second power is obtained according to the second initial voltage and the second result voltage.

9. A battery life test device, characterized in that: The battery life test method according to any one of claims 1 to 8, wherein the battery life test device comprises: A first acquisition module, used for loading a test current to a battery to be tested and acquiring a voltage of the battery to be tested under the test current to obtain an initial voltage; A working condition simulation module, used to make the battery to be tested run according to a preset simulation working condition for a preset test time to obtain a simulated battery; A second acquisition module, used for loading the test current to the simulated completed battery and acquiring the voltage of the simulated completed battery under the test current to obtain a result voltage; The data processing module is used to obtain the voltage decay condition according to the initial voltage and the result voltage, so as to evaluate the life of the battery to be tested according to the voltage decay condition.

10. The battery life test device according to claim 9, characterized in that: The battery life test device also includes: a gas flow control module, used to control the flow of hydrogen gas input into the battery to be tested; and / or, a gas pressure control module, used to control the pressure of hydrogen gas input into the battery to be tested; and / or, The fan-type stack cooling module is used to control the flow rate of air input into the battery to be tested and to adjust the temperature of the battery to be tested so that the battery to be tested is within an optimal operating temperature range.

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