Method and device for obtaining the residual life of a fuel cell stack of a hydrogen fuel vehicle

Abstract

This application discloses a method and apparatus for obtaining the remaining life of a fuel cell stack in a hydrogen fuel cell vehicle, relating to the field of fuel cell vehicle technology. The method includes periodically sending remaining life acquisition commands; the acquisition cycle is positively correlated with the measurement accuracy of the voltage acquisition device and negatively correlated with the actual voltage drop of the fuel cell stack; the fuel cell system adjusts the average output voltage of all individual cells to the designed output voltage V according to the commands. 设计 After maintaining the first duration T1, the reference current I of the fuel cell stack is obtained. 基准 Adjust the average output current of all single cells to the reference current I. 基准 After maintaining the second duration T2, the actual output voltage V of the fuel cell stack is obtained. 实际 According to the actual output voltage V 实际 and the designed output voltage V 设计 The remaining lifetime is obtained. This application accurately determines the remaining lifetime by obtaining the voltage drop of the fuel cell stack under a reference current, and further improves the accuracy of the results by flexibly adjusting the acquisition period.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cell vehicles, in particular to a method and device for obtaining the remaining life of a fuel cell stack of a hydrogen fuel vehicle. BACKGROUND

[0002] With increasing concern about environmental protection and energy issues, hydrogen fuel cells are considered an important direction for future vehicle development. Under the guidance of the fuel cell vehicle demonstration city group target and policy support, the number of hydrogen fuel vehicles is increasing, but due to the limitations of the technical level of the fuel cell system, the life of the fuel cell stack cannot meet the actual needs of hydrogen fuel vehicles, so the replacement of the fuel cell stack is involved in the vehicle life cycle of the hydrogen fuel cell vehicle, and the remaining life of the fuel cell stack needs to be displayed in real time on the hydrogen fuel cell vehicle and timely reminders are needed for users to maintain and replace. However, the hydrogen fuel cell system is composed of many complex components, and the detection and fault diagnosis of its operating state have always been a problem faced by the development of this technology. Among them, the hydrogen fuel vehicle generally includes a fuel cell system and a power battery system, the fuel cell system includes a hydrogen fuel supply assembly, a fuel cell stack, and a battery stack operation support assembly, and the fuel cell stack includes a plurality of single cells.

[0003] In the prior art, voltage-time data and current-time data are collected during the operation of the fuel cell stack, and the average single cell voltage-time data under the rated working current is obtained according to the voltage-time data and the current-time data, and the voltage decay rate of the fuel cell stack is obtained. The remaining life of the fuel cell is calculated according to the calculation formula.

[0004] However, the existing technical solution has two objective shortcomings, one is that the period for obtaining the average single cell voltage-time data under the rated working current is uncontrollable, and there may be a situation where it cannot be collected for a long time; the other is that the voltage decay rate will change according to the use of the vehicle, which will cause the calculated remaining life of the fuel cell to jump based on the calculation formula of the voltage decay rate, reducing the credibility of the calculated remaining life for the user. SUMMARY

[0005] In view of the defects in the prior art, the purpose of the present application is to provide a method and device for obtaining the remaining life of a fuel cell stack of a hydrogen fuel vehicle, which accurately obtains the remaining life by obtaining the voltage drop of the fuel cell stack under the reference current, and further improves the accuracy of the results by flexibly adjusting the acquisition period.

[0006] To achieve the above purpose, the technical solution adopted is:

[0007] The first aspect of the present application provides a method for obtaining the remaining life of a fuel cell stack of a hydrogen fuel vehicle, comprising:

[0008] When it is determined that both the fuel cell system and the power battery system are operating normally and meet the preset conditions, a remaining life acquisition command is sent to the fuel cell system according to the set acquisition cycle; the acquisition cycle is positively correlated with the measurement accuracy of the voltage acquisition device of the fuel cell stack and negatively correlated with the actual voltage drop of the fuel cell stack.

[0009] According to the instructions, the fuel cell system adjusts the average output voltage of all individual cells to the designed output voltage V. 设计 After maintaining the first time period T1, the average output current of all individual cells is collected and averaged to obtain the reference current I of the fuel cell stack. 基准 Adjust the average output current of all single cells to the reference current I. 基准 After maintaining the second time period T2, the average output voltage of all individual cells is collected and averaged to obtain the actual output voltage V of the fuel cell stack. 实际 ;

[0010] Based on the actual output voltage V of the fuel cell stack 实际 and the designed output voltage V 设计 , and obtain its remaining lifespan.

[0011] In some embodiments, the method further includes:

[0012] When the vehicle controller determines that the vehicle meets the preset first condition, it sends an operating command to the fuel cell system.

[0013] The first condition includes the high voltage of the hydrogen fuel cell vehicle's drive system switching from a cut-off state to an on state, and the high voltage V supplied by the hydrogen fuel cell vehicle to the fuel cell system. 供给 Satisfy V 供给 ≥450V, the remaining SOC of the power battery system meets 50%≤SOC≤85%, and the vehicle speed V 车速 Satisfy V 车速 ≥5km / h.

[0014] In some embodiments, the method further includes:

[0015] When the vehicle controller determines that the vehicle meets the preset first condition, it sends an operating command to the fuel cell system.

[0016] The first condition includes the high voltage of the hydrogen fuel cell vehicle's drive system switching from a cut-off state to an on state, and the high voltage V supplied by the hydrogen fuel cell vehicle to the fuel cell system. 供给 Satisfy V 供给 ≥450V, the remaining power battery system's SOC meets the requirement of SOC < 50%.

[0017] In some embodiments, the method further includes:

[0018] After the fuel cell system is operated, the vehicle controller sends the remaining life obtaining instruction to the fuel cell system when it is determined that the power battery system satisfies a preset second condition;

[0019] The second condition includes that the operation time of the fuel cell system is not less than a preset preparation time, and the remaining SOC of the power battery system satisfies SOC min ≤SOC≤SOC max ;

[0020] SOC min is used to represent the first minimum remaining SOC required by the power battery system to provide power to the drive system of the hydrogen fuel vehicle when the average output voltage of all single cells is lowered to the design voltage V 设计 ;

[0021] SOC max is used to represent the second maximum remaining SOC required by the power battery system to store the excess power generated by the fuel cell system when the average output voltage of all single cells is raised to the design voltage V 设计 , and the third maximum remaining SOC required by the power battery to withstand the charging power generated by the fuel cell system.

[0022] In some embodiments, the acquisition period is calculated using the following formula:

[0023]

[0024] wherein,

[0025] T n is used to represent the nth acquisition period, n is a positive integer;

[0026] T 设计 is used to represent the time corresponding to the design life of the fuel cell stack;

[0027] V 精度 is used to represent the measurement accuracy of the voltage acquisition device;

[0028] x is used to represent any integer between 5 and 10;

[0029] V 设计 is used to represent the average output voltage of the single cell when the fuel cell stack is designed initially;

[0030] L 终止 is used to represent the ratio of the average output voltage of the single cell when the fuel cell stack decays to the end of life to V 设计 ;

[0031] V nVn represents the actual single-cell average output voltage of the fuel cell stack after the nth acquisition cycle.

[0032] In some embodiments, the remaining life is calculated using the following formula:

[0033]

[0034] wherein,

[0035] L 剩余 represents the ratio of the actual single-cell average output voltage of the fuel cell stack to V 设计 ;

[0036] L 终止 represents the ratio of the single-cell average output voltage of the fuel cell stack when the fuel cell stack decays to the end of life to V 设计 ;

[0037] V 实际 represents the actual single-cell average output voltage of the fuel cell stack;

[0038] V 设计 represents the single-cell average output voltage of the fuel cell stack at the design initial time.

[0039] A remaining life acquisition device of a fuel cell stack of a hydrogen fuel vehicle, comprising:

[0040] an instruction output module configured to send a remaining life acquisition instruction to the fuel cell system according to a set acquisition cycle when it is determined that the fuel cell system and the power battery system are both normally operating and meet preset conditions; the acquisition cycle is positively correlated with the measurement accuracy of the voltage acquisition device of the fuel cell stack and is negatively correlated with the actual voltage drop of the fuel cell stack;

[0041] a remaining life calculation module configured to control the fuel cell system to adjust the average output voltage of all single cells to the design output voltage V 设计 , keep the average output voltage for a first time length T1, acquire the average output current of all single cells and take the average to obtain the reference current I 基准 of the fuel cell stack, adjust the average output current of all single cells to the reference current I 基准 , keep the average output current for a second time length T2, acquire the average output voltage of all single cells and take the average to obtain the actual output voltage V 实际 of the fuel cell stack, and obtain the remaining life of the fuel cell stack according to the actual output voltage V 实际 of the fuel cell stack and the design output voltage V 设计 .

[0042] In some embodiments, the instruction output module is further configured to control the vehicle controller to send an operation instruction to the fuel cell system when it is determined that the vehicle satisfies a preset first condition.

[0043] The first condition includes that the high voltage of the drive system of the hydrogen fuel vehicle is switched from a cut-off state to a connected state, the supply high voltage V 供给 of the hydrogen fuel vehicle to the fuel cell system satisfies V 供给 ≥ 450 V, the remaining capacity SOC of the power battery system satisfies 50% ≤ SOC ≤ 85%, and the vehicle speed V 车速 satisfies V 车速 ≥ 5 km / h.

[0044] In some embodiments, the instruction output module is further configured to control the vehicle controller to send an operation instruction to the fuel cell system when it is determined that the vehicle satisfies a preset first condition.

[0045] The first condition includes that the high voltage of the drive system of the hydrogen fuel vehicle is switched from a cut-off state to a connected state, the supply high voltage V 供给 of the hydrogen fuel vehicle to the fuel cell system satisfies V 供给 ≥ 450 V, and the remaining capacity SOC of the power battery system satisfies SOC < 50%.

[0046] In some embodiments, the instruction output module is further configured to control the vehicle controller to send the remaining life acquisition instruction to the fuel cell system when it is determined that the power battery system satisfies a preset second condition after the fuel cell system is operated.

[0047] The second condition includes that the operation duration of the fuel cell system is not less than a preset preparation duration, and the remaining capacity SOC of the power battery system satisfies SOC min ≤ SOC ≤ SOC max .

[0048] SOC min represents a first minimum remaining capacity required for the power battery system to provide power to the drive system of the hydrogen fuel vehicle when the average output voltage of all single cells is lowered to a design voltage V 设计 .

[0049] SOC max represents the minimum value of a second maximum remaining capacity required for the power battery system to store the excess capacity generated by the fuel cell system when the average output voltage of all single cells is raised to a design voltage V 设计 , and a third maximum remaining capacity required for the power battery to withstand the charging power generated by the fuel cell system.

[0050] The technical scheme brings the beneficial effects including:

[0051] By obtaining the decline of the actual output voltage of the fuel cell stack under the reference current, the remaining life of the fuel cell stack is obtained, avoiding the situation that the calculation result jumps when the remaining life of the fuel cell stack is time-reacted due to the change of the vehicle use condition, prompting the maintenance inspection of the fuel cell system when the remaining life of the fuel cell stack is lower than the preset threshold, and realizing efficient early warning.

[0052] By actively obtaining the remaining life of the fuel cell system periodically, the acquisition period is positively related to the measurement accuracy of the voltage acquisition device of the fuel cell stack and negatively related to the actual voltage drop of the fuel cell stack, that is, the acquisition period is obtained by comparing the integral multiple of the voltage measurement accuracy of the voltage acquisition device with the voltage drop each time, the acquisition period can be enlarged or reduced in real time, and the calculation result accuracy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 For the embodiment of the present application, the flow chart of the fuel cell stack remaining life acquisition method of the hydrogen fuel vehicle.

[0054] Figure 2 For the embodiment of the present application, the functional module schematic diagram of the fuel cell stack remaining life acquisition device of the hydrogen fuel vehicle. DETAILED DESCRIPTION

[0055] The present application will be further described in detail below in combination with the drawings and embodiments.

[0056] Fuel cell vehicle (FCV): a kind of electric vehicle, the energy of its battery is through the chemical action of hydrogen and oxygen, not through combustion, directly into electric energy, fuel cell vehicle includes vehicle controller, drive system, fuel cell system and power battery system, fuel cell system and power battery system are used to power drive system, drive system is used to drive the vehicle to run.

[0057] Vehicle control unit (VCU): the main function is to coordinate and manage the running state of the vehicle.

[0058] Fuel-cell Control Unit (FCU): the main function is to receive the control instruction of the vehicle, coordinate other controllers and actuators in the fuel cell system, and output the required power of the vehicle.

[0059] Fuel cell vehicles (FCV) mode: fuel cell system and power battery system are in standby state, and can select fuel cell system driving or power battery system driving according to the actual running demand of the vehicle.

[0060] A battery stack is not an actual collection of batteries placed together; rather, it is a fuel cell term referring to a stack of multiple fuel cells designed to provide voltage for practical applications.

[0061] See Figure 1 As shown, this invention provides a method and apparatus for obtaining the remaining life of a fuel cell stack in a hydrogen fuel cell vehicle, including periodically sending remaining life acquisition commands. The acquisition cycle is positively correlated with the measurement accuracy of the voltage acquisition device and negatively correlated with the actual voltage drop of the fuel cell stack. Based on the aforementioned commands, the fuel cell system adjusts the average output voltage of all individual cells to the designed output voltage V. 设计 After maintaining the first duration T1, the reference current I of the fuel cell stack is obtained. 基准 Adjust the average output current of all single cells to the reference current I. 基准 After maintaining the second duration T2, the actual output voltage V of the fuel cell stack is obtained. 实际 Based on the actual output voltage V 实际 and the designed output voltage V 设计 The remaining lifetime is obtained. This application accurately determines the remaining lifetime by obtaining the voltage drop of the fuel cell stack under a reference current, and further improves the accuracy of the results by flexibly adjusting the acquisition period.

[0062] In one specific embodiment, a method for obtaining the remaining lifespan of a fuel cell stack in a hydrogen fuel cell vehicle includes:

[0063] Step S1: When it is determined that both the fuel cell system and the power battery system are operating normally and meet preset conditions, a remaining lifespan acquisition command is sent to the fuel cell system according to the set acquisition cycle. The aforementioned acquisition cycle is positively correlated with the measurement accuracy of the voltage acquisition device of the fuel cell stack and negatively correlated with the actual voltage drop of the fuel cell stack.

[0064] Step S2: According to the above instructions, the fuel cell system adjusts the average output voltage of all individual cells to the designed output voltage V. 设计 After maintaining the first time period T1, the average output current of all individual cells is collected and averaged to obtain the reference current I of the fuel cell stack. 基准 Adjust the average output current of all single cells to the reference current I. 基准 After maintaining the second time period T2, the average output voltage of all individual cells is collected and averaged to obtain the actual output voltage V of the fuel cell stack. 实际 .

[0065] Step S3: Based on the actual output voltage V of the fuel cell stack 实际 and the designed output voltage V 设计 To obtain its remaining lifespan.

[0066] In the embodiment, generally, the single cell output voltage of the hydrogen fuel cell is 0.6-0.9V (corresponding to high power output and low power output respectively), and the single cell average output voltage V 设计 is designed to be 0.6-0.9V at the initial design, and is set according to user customization.

[0067] The fuel cell system controller receives the remaining life acquisition instruction, adjusts the voltage of the fuel cell stack to obtain the reference current, obtains the remaining life of the fuel cell stack by obtaining the drop of the actual output voltage of the fuel cell stack under the reference current, avoids the situation that the calculation result jumps due to the change of the vehicle use condition when the remaining life of the fuel cell stack is time-reacted, and prompts the maintenance inspection of the fuel cell system when the remaining life of the fuel cell stack is lower than the preset threshold, thereby realizing efficient early warning.

[0068] The remaining life of the fuel cell system is periodically obtained by active means, the acquisition period is positively related to the measurement accuracy of the voltage acquisition device of the fuel cell stack and is negatively related to the actual voltage drop of the fuel cell stack, that is, the acquisition period is obtained by comparing the integer multiple of the voltage measurement accuracy of the voltage acquisition device with the voltage drop each time, the acquisition period can be enlarged or reduced in real time, and the calculation result accuracy is improved.

[0069] In a preferred embodiment, the above method further comprises:

[0070] When it is judged that the whole vehicle meets the preset first condition, the whole vehicle controller sends a running instruction to the fuel cell system.

[0071] The above first condition includes that the high voltage of the driving system of the hydrogen fuel vehicle is switched from the cut-off state to the on state, the supply high voltage V 供给 of the hydrogen fuel vehicle to the fuel cell system meets V 供给 ≥450V, the remaining capacity SOC of the power battery system meets 50%≤SOC≤85%, and the vehicle speed V 车速 meets V 车速 ≥5km / h.

[0072] In the embodiment, the fuel cell stack remaining life acquisition method first needs to judge whether the whole vehicle structure and function are normal, including whether the structure and function of the vehicle body are normal, whether the structure and function of the whole vehicle controller are normal, whether the structure and function of the driving system are normal, whether the structure and function of the fuel cell system are normal, and whether the structure and function of the power battery system are normal, etc. Only when all the structures and functions of the whole vehicle are normal, the whole vehicle mode can be switched to the FCV mode, that is, the fuel cell system and the power battery system enter the standby state.

[0073] After the vehicle mode is switched to the FCV mode, it is determined whether the vehicle satisfies the first condition, if yes, the vehicle controller sends a running instruction to the fuel cell system, the fuel cell system starts running after receiving the running instruction, and the fuel cell system supplies power to the driving system to drive the vehicle.

[0074] In a preferred embodiment, the method further comprises:

[0075] When it is determined that the vehicle satisfies the preset first condition, the vehicle controller sends a running instruction to the fuel cell system.

[0076] The first condition includes that the driving system of the hydrogen fuel vehicle is switched from the off state to the on state, the supply high voltage V 供给 satisfies V 供给 ≥450V, and the remaining power amount SOC of the power battery system satisfies SOC<50%.

[0077] In the embodiment, the fuel cell stack remaining life acquisition method first needs to determine whether the vehicle structure and functions are normal, including whether the vehicle body structure and functions are normal, whether the vehicle controller structure and functions are normal, whether the driving system structure and functions are normal, whether the fuel cell system structure and functions are normal, and whether the power battery system structure and functions are normal, etc. Only when all the structures and functions of the vehicle are normal, the vehicle mode can be switched to the FCV mode, that is, the fuel cell system and the power battery system enter the standby state.

[0078] After the vehicle mode is switched to the FCV mode, it is determined whether the vehicle satisfies the first condition, if yes, the vehicle controller sends a running instruction to the fuel cell system, the fuel cell system starts running after receiving the running instruction, and the fuel cell system supplies power to the driving system to drive the vehicle.

[0079] In a preferred embodiment, the method further comprises:

[0080] After the fuel cell system runs, when it is determined that the power battery system satisfies the preset second condition, the vehicle controller sends the remaining life acquisition instruction to the fuel cell system.

[0081] The second condition includes that the running time of the fuel cell system is not less than the preset preparation time, and the remaining power amount SOC of the power battery system satisfies SOC min ≤SOC≤SOC max .

[0082] SOC min is used to represent that the average output voltage of all single cells is lowered to the design voltage V 设计The first minimum residual amount of electricity required for the power battery system to provide power to the driving system of the hydrogen fuel vehicle.

[0083] SOC max The average output voltage of all single cells is adjusted to the design voltage V 设计 The second maximum residual amount of electricity required for the power battery system to store the excess electricity generated by the fuel cell system and the third maximum residual amount of electricity required for the power battery to withstand the charging power generated by the fuel cell system.

[0084] In this embodiment, after the fuel cell system is running, the vehicle controller further determines whether the power battery system meets the second condition, and sends a residual life acquisition instruction to the fuel cell system when it meets.

[0085] The running time of the fuel cell system in the second condition is not less than the preset preparation time, which means that the fuel cell system will experience a preset preparation time during the factory and test, and when the running time exceeds this time, it means that the fuel cell system has completed the early preparation and can run normally.

[0086] After receiving the residual life acquisition instruction, the fuel cell system adjusts the average output voltage of all single cells constituting the fuel cell stack to the design output voltage V 设计 and the first time T1 according to the design output voltage V 设计 in the instruction, and then maintains the first time T1, collects the average output current of all single cells in the first time T1 and takes the average of the average output current of all single cells to obtain the reference current I 基准 .

[0087] When adjusting the voltage, the average output voltage of all single cells may be greater than the design output voltage V 设计 or less than the design output voltage V 设计 .

[0088] When the average output voltage of all single cells is greater than the design output voltage V 设计 , the average output voltage of all single cells needs to be adjusted to the design voltage V 设计 , and the output voltage of the fuel cell stack is adjusted passively, which may cause insufficient function to the vehicle, so the power battery system needs to function to the driving system to make up for the power supply gap of the fuel cell stack, therefore, the minimum residual amount of electricity SOC min of the power battery system needs to be valued to ensure that the power battery system can supply power to the vehicle and ensure that the vehicle continues to run normally.

[0089] When the average output voltage of all single cells is less than the design output voltage V设计 When the average output voltage of all single cells needs to be adjusted to the designed output voltage V 设计 When the output voltage of the fuel cell stack is adjusted passively, it may cause over-function, and in this case, the power battery system needs to absorb and store the extra power generated by the fuel cell stack, so the maximum remaining power SOC max of the power battery system needs to be determined to ensure that the power battery system can absorb and store the extra power and ensure that the power battery can withstand the charging power output by the fuel cell system and ensure that the vehicle can continue to drive normally.

[0090] In a preferred embodiment, the above-mentioned acquisition period is calculated by the following formula (1):

[0091]

[0092] Wherein, T n represents the nth acquisition period, and n is a positive integer. T 设计 represents the time corresponding to the designed life of the fuel cell stack. V 精度 represents the measurement accuracy of the voltage acquisition device. x represents any integer between 5 and 10. V 设计 represents the average output voltage of the single cell at the initial design of the fuel cell stack. L 终止 represents the ratio of the average output voltage of the single cell when the fuel cell stack decays to the end of life to V 设计 . V n represents the actual average output voltage of the single cell of the fuel cell stack obtained after the nth acquisition period.

[0093] In this embodiment, L 终止 is generally 90%, that is, when the loss of the fuel cell stack reaches 10% of its factory standard state, the remaining loss amount is 90%, at this time, the fuel cell stack reaches the end of life.

[0094] The end of life of the fuel cell is defined as the average voltage of the fuel cell decaying by 10% at the reference current. The reference current of the fuel cell stack is defined as the current when the average voltage of the fuel cell is 0.7V.

[0095] When x is 5, it means that the decrease of the voltage each time is compared with 5 times the voltage measurement accuracy of the voltage detector, and the acquisition period is enlarged or reduced in real time.

[0096] In a preferred embodiment, the above-mentioned remaining life is calculated by the following formula (2):

[0097]

[0098] Wherein, L 剩余A ratio of an actual single cell average output voltage of a fuel cell stack to V 设计 A ratio of an actual single cell average output voltage of a fuel cell stack to V 终止 A ratio of an actual single cell average output voltage of a fuel cell stack to V 设计 A ratio of an actual single cell average output voltage of a fuel cell stack to V 实际 A ratio of an actual single cell average output voltage of a fuel cell stack to V 设计 A ratio of an actual single cell average output voltage of a fuel cell stack to V

[0099] In summary, the remaining life of the fuel cell stack is obtained by sending a remaining life acquisition instruction by the vehicle controller, obtaining the voltage drop of the fuel cell stack under the reference current, and avoiding the jump caused by the change of the vehicle use condition when the time reacts to the remaining life of the fuel cell. After the instrument reads the remaining life of the remaining fuel cell stack, the remaining life is displayed, and when the fuel cell system reaches the end of life, the user is prompted to maintain.

[0100] As shown in Figure 2 , the application also provides a fuel cell stack remaining life acquisition device of a hydrogen fuel vehicle, comprising an instruction output module 1 and a remaining life calculation module 2. The instruction output module 1 is used to send a remaining life acquisition instruction to the fuel cell system according to a set acquisition period when it is judged that the fuel cell system and the power battery system are both normally running and meet the preset conditions. The acquisition period is positively related to the measurement accuracy of the voltage acquisition device of the fuel cell stack and negatively related to the actual voltage drop of the fuel cell stack. The remaining life calculation module 2 is used to control the fuel cell system to adjust the average output voltage of all single cells to the design output voltage V 设计 after a first duration T1, acquire the average output current of all single cells and take the average to obtain the reference current I 基准 of the fuel cell stack, adjust the average output current of all single cells to the reference current I 基准 after a second duration T2, acquire the average output voltage of all single cells and take the average to obtain the actual output voltage V 实际 of the fuel cell stack, and obtain the remaining life of the fuel cell stack according to the actual output voltage V 实际 of the fuel cell stack and the design output voltage V 设计 .

[0101] In a preferred embodiment, the instruction output module 1 is also used to control the vehicle controller to send a running instruction to the fuel cell system when it is judged that the vehicle meets the preset first condition.

[0102] The first condition includes that the high voltage of the drive system of the hydrogen fuel vehicle is switched from the cut-off state to the on state, the supply high voltage V 供给V 供给 450V, the remaining capacity SOC of the power battery system satisfies 50%≤SOC≤85%, and the vehicle speed V 车速 V 车速 5km / h.

[0103] In a preferred embodiment, the instruction output module 1 is further configured to control the vehicle controller to send the operation instruction to the fuel cell system when it is determined that the vehicle satisfies the preset first condition.

[0104] The first condition includes that the high voltage of the drive system of the hydrogen fuel vehicle is switched from the off state to the on state, the supply high voltage V 供给 V 供给 450V, and the remaining capacity SOC of the power battery system satisfies SOC≤50%.

[0105] In a preferred embodiment, the instruction output module 1 is further configured to control the vehicle controller to send the remaining life acquisition instruction to the fuel cell system when it is determined that the power battery system satisfies the preset second condition after the fuel cell system is operated.

[0106] The second condition includes that the operation time of the fuel cell system is not less than the preset preparation time, and the remaining capacity SOC of the power battery system satisfies SOC min ≤SOC≤SOC max .

[0107] SOC min is used to represent the first minimum remaining capacity required by the power battery system to provide power to the drive system of the hydrogen fuel vehicle when the average output voltage of all single cells is lowered to the design voltage V 设计 .

[0108] SOC max is used to represent the second maximum remaining capacity required by the power battery system to store the excess capacity generated by the fuel cell system when the average output voltage of all single cells is raised to the design voltage V 设计 .

[0109] The fuel cell stack remaining life acquisition device of the hydrogen fuel vehicle of the embodiment is applicable to the fuel cell stack remaining life acquisition method of each hydrogen fuel vehicle.

[0110] The present application is not limited to the above-mentioned embodiments, and those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements are also considered within the protection scope of the present application.

Claims

1. A method for obtaining the remaining life of a fuel cell stack of a hydrogen fuel vehicle, comprising: sending an instruction for obtaining the remaining life to a fuel cell system according to a set obtaining period when it is determined that the fuel cell system and a power battery system are normally operating and meet preset conditions; the obtaining period is positively correlated with the measurement accuracy of a voltage collection device of the fuel cell stack and negatively correlated with the actual voltage drop of the fuel cell stack; the obtaining period is calculated according to the following formula: wherein, x represents any integer between 5 and 10; the remaining life is calculated according to the following formula: wherein, the method further comprises: sending an operation instruction to the fuel cell system by a vehicle controller when it is determined that the vehicle meets preset first conditions; the method further comprises: sending an operation instruction to the fuel cell system by the vehicle controller when it is determined that the vehicle meets preset first conditions; the method further comprises: sending the instruction for obtaining the remaining life to the fuel cell system by the vehicle controller when it is determined that the power battery system meets preset second conditions after the fuel cell system is operated; comprising: an instruction output module configured to send an instruction for obtaining the remaining life to a fuel cell system according to a set obtaining period when it is determined that the fuel cell system and a power battery system are normally operating and meet preset conditions; the obtaining period is positively correlated with the measurement accuracy of a voltage collection device of the fuel cell stack and negatively correlated with the actual voltage drop of the fuel cell stack; the obtaining period is calculated according to the following formula: wherein, x represents any integer between 5 and 10; the remaining life is calculated according to the following formula: wherein, the instruction output module is further configured to control a vehicle controller to send an operation instruction to the fuel cell system when it is determined that the vehicle meets preset first conditions; the instruction output module is further configured to control the vehicle controller to send an operation instruction to the fuel cell system when it is determined that the vehicle meets preset first conditions; the instruction output module is further configured to control the vehicle controller to send the instruction for obtaining the remaining life to the fuel cell system when it is determined that the power battery system meets preset second conditions after the fuel cell system is operated. ​ The fuel cell system adjusts the average output voltage of all single cells to the design output voltage V 设计 After maintaining the first time length T1, the average output current of all single cells is collected and averaged to obtain the reference current I of the fuel cell stack 基准 The average output current of all single cells is adjusted to the reference current I 基准 After maintaining the second time length T2, the average output voltage of all single cells is collected and averaged to obtain the actual output voltage of the fuel cell stack V 实际 ； According to the actual output voltage V of the fuel cell stack 实际 and the design output voltage V 设计 , the remaining life thereof is obtained; ​ ​ T n for representing the n-th acquisition period, n being a positive integer; T 设计 for indicating a length of time corresponding to a design life of the fuel cell stack; V 精度 for indicating the measurement accuracy of the voltage acquisition device; ​ V 设计 for indicating the average output voltage of a single cell at the initial time of the fuel cell stack design; L 终止 the ratio of the average output voltage of a single cell to V 设计 at the time when the fuel cell stack decays to the end of life V n Vn represents the actual cell average output voltage of the fuel cell stack acquired after the nth acquisition cycle; ​ ​ L 剩余 for indicating the ratio of the actual single cell average output voltage of the fuel cell stack to V 设计 for indicating the ratio of the actual single cell average output voltage of the fuel cell stack to V L 终止 the ratio of the average output voltage of a single cell to V 设计 at the time when the fuel cell stack decays to the end of life V 实际 for indicating the actual single cell average output voltage of the fuel cell stack; V 设计 Used to represent the average single cell output voltage at the beginning of the fuel cell stack design.

2. The method of claim 1, wherein the remaining life of the fuel cell stack of the hydrogen fuel vehicle is obtained by the following equation: ###0001### where, L is the remaining life of the fuel cell stack, A is the initial life of the fuel cell stack, and B is the degradation rate of the fuel cell stack. ​ ​ The first condition includes that the drive system high pressure of the hydrogen fuel vehicle is switched from a cut-off state to an on state, the supply high pressure V 供给 is satisfied V 供给 ≥450 V, the state of charge SOC of the traction battery system satisfies 50% < SOC < 85%, and the vehicle speed V 车速 satisfies V 车速 ≥ 5 km / h.

3. The method of claim 1, wherein the remaining life of the fuel cell stack of the hydrogen fuel vehicle is obtained by the following equation: ###0001### where, L is the remaining life of the fuel cell stack, A is the initial life of the fuel cell stack, and B is the degradation rate of the fuel cell stack. ​ ​ The first condition includes that the drive system high pressure of the hydrogen fuel vehicle is switched from a cut-off state to an on state, the supply high pressure V 供给 is satisfied V 供给 ≥450V, the remaining power SOC of the power battery system satisfies SOC < 50%.

4. The method for obtaining the remaining lifespan of a fuel cell stack for a hydrogen fuel cell vehicle as described in claim 1, characterized in that, ​ ​ The second condition comprises that the fuel cell system operating time is not less than a preset preparation time, and the remaining power SOC of the power battery system satisfies SOC min ≤ SOC ≤ SOC max ; SOC min for indicating that the average output voltage of all the single cells is to be adjusted down to a design voltage V 设计 a first minimum residual amount of electricity required for the power battery system to provide power to the drive system of the hydrogen fuel vehicle; SOC max for indicating that the average output voltage of all the single cells is raised to the design voltage V 设计 the minimum of the second maximum surplus electric quantity required for the power battery system to store the excess electric quantity generated by the fuel cell system and the third maximum surplus electric quantity required for the power battery to be able to withstand the charging power generated by the fuel cell system.

5. A device for obtaining the remaining lifespan of a fuel cell stack for a hydrogen fuel cell vehicle, characterized in that, ​ ​ a remaining life calculation module for controlling the fuel cell system to adjust the average output voltage of all the single cells to a design output voltage V 设计 After maintaining the first time length T1, the average output current of all the single cells is collected and averaged to obtain the reference current I of the fuel cell stack 基准 The average output current of all the single cells is adjusted to the reference current I 基准 After maintaining the second time length T2, the average output voltage of all the single cells is collected and averaged to obtain the actual output voltage V of the fuel cell stack 实际 ; and for obtaining the remaining life of the fuel cell stack according to the actual output voltage V 实际 and the design output voltage V 设计 of the fuel cell stack ​ ​ T n for representing the n-th acquisition period, n being a positive integer; T 设计 for indicating a length of time corresponding to a design life of the fuel cell stack; V 精度 for indicating the measurement accuracy of the voltage acquisition device; ​ V 设计 for indicating the average output voltage of a single cell at the initial time of the fuel cell stack design; L 终止 the ratio of the average output voltage of a single cell to V 设计 at the time when the fuel cell stack decays to the end of life V n Vn represents the actual cell average output voltage of the fuel cell stack after the nth acquisition cycle; ​ ​ L 剩余 for indicating the ratio of the actual single cell average output voltage of the fuel cell stack to V 设计 the voltage of the fuel cell stack L 终止 for representing the ratio of the average output voltage of a single cell to V 设计 at the time when the fuel cell stack decays to the end of life V 实际 for indicating the actual single cell average output voltage of the fuel cell stack; V 设计 Used to represent the average single cell output voltage at the beginning of the fuel cell stack design.

6. The device according to claim 5, wherein the device is characterized by comprising: a fuel cell stack remaining life acquisition means for acquiring the remaining life of the fuel cell stack of the hydrogen fuel vehicle. ​ The first condition includes that the drive system high pressure of the hydrogen fuel vehicle is switched from a cut-off state to an on state, the supply high pressure V 供给 is satisfied V 供给 ≥450 V, the state of charge SOC of the traction battery system satisfies 50% < SOC < 85%, and the vehicle speed V 车速 satisfies V 车速 ≥ 5 km / h.

7. The device according to claim 5, wherein the device is characterized by comprising: a fuel cell stack remaining life acquisition means for acquiring the remaining life of the fuel cell stack of the hydrogen fuel vehicle. ​ The first condition includes that the drive system high pressure of the hydrogen fuel vehicle is switched from a cut-off state to an on state, the supply high pressure V 供给 is satisfied V 供给 ≥450V, the remaining power SOC of the power battery system satisfies SOC < 50%.

8. The device according to claim 5, wherein the device is characterized by comprising: a fuel cell stack remaining life acquisition means for acquiring the remaining life of the fuel cell stack of the hydrogen fuel vehicle. ​ The second condition comprises that the fuel cell system operating time is not less than a preset preparation time, and the remaining power SOC of the power battery system satisfies SOC min ≤ SOC ≤ SOC max ; SOC min for indicating that the average output voltage of all the single cells is to be adjusted down to a design voltage V 设计 a first minimum residual amount of electricity required for the power battery system to provide power to the drive system of the hydrogen fuel vehicle when the average output voltage of all the single cells is adjusted down to the design voltage V SOC max for indicating that the average output voltage of all the single cells is raised to the design voltage V 设计 the minimum of the second maximum surplus electric quantity required for storing the excess electric quantity generated by the fuel cell system by the power battery system and the third maximum surplus electric quantity required for the power battery to be able to withstand the charging power generated by the fuel cell system.

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