Method, apparatus and electronic device for determining battery aging degree

Abstract

The present invention provides a method, apparatus, and electronic device for determining the degree of battery aging, including: determining whether the current state of the battery meets a preset test condition; if so, applying a high voltage and sending a signal of motor stalling to the electronic parking controller and the motor controller, so that the electronic parking controller and the motor controller control the motor to enter the working condition of motor stalling; collecting the voltage signal and current signal of the battery within a preset time; calculating the internal resistance change and discharge power of the battery according to the voltage signal and current signal; determining the internal resistance growth ratio of the battery based on the calibrated internal resistance change table and the internal resistance change of the battery, and determining the power attenuation ratio of the battery based on the calibrated discharge power table and the discharge power of the battery, so as to obtain the degree of battery aging. The determination method of the present invention can create a stable and controllable working condition of motor stalling, and then determine the degree of battery aging on the actual vehicle under the stable and controllable working condition of motor stalling.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive batteries, and in particular, to a method, device, and electronic device for determining the degree of battery aging. Background Art

[0002] The aging of electric vehicle batteries is manifested in multiple dimensions, including capacity attenuation, internal resistance increase, and power attenuation. Similarly, the state of health (SOH) of electric vehicles can also be divided into SOH_capacity, SOH_internal resistance, and SOH_power. Online identification of various battery aging parameters is of great help for battery fault identification, retirement, and secondary utilization.

[0003] Generally, the SOH estimated for electric vehicles only considers the dimension of capacity attenuation. By observing the change in state of charge (SOC) and the change in ampere-hour (Ah) during a single key cycle, the current total capacity of the battery can be determined, and then the attenuation of the total capacity can be determined. However, since the SOH defined by internal resistance and power is highly correlated with the operating conditions, if the influence of the operating conditions cannot be excluded, the estimation of internal resistance growth and power attenuation cannot be accurate. That is to say, the estimation of internal resistance growth and power attenuation is only valuable under the same operating conditions. In the actual discharge process of electric vehicles, the current and voltage are uncontrollable, which means that the actual discharge process of electric vehicles is not a stable and unchanging operating condition. Therefore, the prior art is still unable to determine the aging degree of the internal resistance growth and power attenuation of the battery on a real vehicle.

[0004] In summary, how to determine the aging degree of the battery on a real vehicle has become a technical problem that urgently needs to be solved at present. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method, device, and electronic device for determining the degree of battery aging, so as to alleviate the technical problem that the prior art is unable to determine the aging degree of the battery on a real vehicle.

[0006] In a first aspect, an embodiment of the present invention provides a method for determining the degree of battery aging, including:

[0007] Judging whether the current state of the battery meets a preset test condition;

[0008] If it meets, apply high voltage and send a signal of motor stall to the electronic parking brake controller and the motor controller, so that the electronic parking brake controller and the motor controller control the motor to enter the motor stall condition;

[0009] Under the condition of motor stall, collect the voltage signal and current signal of the battery within a preset time;

[0010] Calculate the internal resistance change of the battery and the discharge power of the battery according to the voltage signal and the current signal;

[0011] Determine the internal resistance growth ratio of the battery based on the calibrated internal resistance change table and the internal resistance change of the battery, and determine the power attenuation ratio of the battery based on the calibrated discharge power table and the discharge power of the battery. Furthermore, use the internal resistance growth ratio and the power attenuation ratio of the battery as the aging degree of the battery.

[0012] Further, determine whether the current state of the battery meets the preset test conditions, including:

[0013] Determine whether the static time of the battery reaches the preset static time threshold, whether the SOC of the battery is not less than the preset SOC threshold, and whether the temperature of the battery is not less than the preset temperature threshold;

[0014] If the static time of the battery reaches the preset static time threshold, the SOC of the battery is not less than the preset SOC threshold, and the temperature of the battery is not less than the preset temperature threshold, it is determined that the current state of the battery meets the preset test conditions.

[0015] Further, the working condition of the motor stalling is: electronic parking brake is turned on, and the motor outputs work according to a preset power.

[0016] Further, calculate the internal resistance change and the discharge power of the battery according to the voltage signal and the current signal, including:

[0017] Calculate the voltage change according to the voltage signal, and calculate the current change according to the current signal;

[0018] Calculate the internal resistance change of the battery according to the voltage change and the current change;

[0019] Calculate the average discharge power of the battery according to the voltage signal and the current signal, and use the average discharge power of the battery as the discharge power of the battery.

[0020] Further, determine the internal resistance growth ratio of the battery based on the calibrated internal resistance change table and the internal resistance change of the battery, including:

[0021] Determine the target internal resistance change corresponding to the current state in the calibrated internal resistance change table;

[0022] Calculate the current internal resistance growth ratio of the battery according to the internal resistance change of the battery and the target internal resistance change;

[0023] Calculate the internal resistance growth ratio of the battery according to the current internal resistance growth ratio of the battery and the previous internal resistance growth ratio of the battery.

[0024] Further, determining the power attenuation ratio of the battery based on the calibrated discharge power table and the discharge power of the battery includes:

[0025] Determining a target discharge power corresponding to the current state in the calibrated discharge power table;

[0026] Calculating the current power attenuation ratio of the battery according to the discharge power of the battery and the target discharge power;

[0027] Calculating the power attenuation ratio of the battery according to the current power attenuation ratio of the battery and the previous power attenuation ratio of the battery.

[0028] In a second aspect, an embodiment of the present invention further provides a device for determining the aging degree of a battery, including:

[0029] A judgment unit, configured to judge whether the current state of the battery meets a preset test condition;

[0030] A sending unit, configured to, if it is satisfied, apply high voltage and send a signal of motor stall to an electronic parking controller and a motor controller, so that the electronic parking controller and the motor controller control the motor to enter a motor stall working condition;

[0031] An acquisition unit, configured to acquire the voltage signal and current signal of the battery within a preset time in the motor stall working condition;

[0032] A calculation unit, configured to calculate the internal resistance change and the discharge power of the battery according to the voltage signal and the current signal;

[0033] A determination unit, configured to determine the internal resistance growth ratio of the battery based on a calibrated internal resistance change table and the internal resistance change of the battery, and determine the power attenuation ratio of the battery based on a calibrated discharge power table and the discharge power of the battery, and further use the internal resistance growth ratio and the power attenuation ratio of the battery as the aging degree of the battery.

[0034] Further, the judgment unit is further configured to:

[0035] Judge whether the static time of the battery reaches a preset static time threshold, and whether the SOC of the battery is not less than a preset SOC threshold, and whether the temperature of the battery is not less than a preset temperature threshold;

[0036] If the static time of the battery reaches the preset static time threshold, and the SOC of the battery is not less than the preset SOC threshold, and the temperature of the battery is not less than the preset temperature threshold, it is determined that the current state of the battery meets the preset test condition.

[0037] In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the method according to any one of the above first aspects are implemented.

[0038] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium storing machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions cause the processor to execute the method according to any one of the above first aspects.

[0039] In an embodiment of the present invention, a method for determining the degree of battery aging is provided, including: determining whether the current state of the battery meets a preset test condition; if it meets, applying high voltage and sending a signal of motor stall to an electronic parking controller and a motor controller, so that the electronic parking controller and the motor controller control the motor to enter a motor stall condition; in the motor stall condition, collecting voltage signals and current signals of the battery within a preset time; calculating the internal resistance change and the discharge power of the battery according to the voltage signals and current signals; determining the internal resistance growth ratio of the battery based on a calibrated internal resistance change table and the internal resistance change of the battery, and determining the power attenuation ratio of the battery based on a calibrated discharge power table and the discharge power of the battery, and then taking the internal resistance growth ratio and the power attenuation ratio of the battery as the degree of battery aging. It can be seen from the above description that the method for determining the degree of battery aging of the present invention can create a stable and controllable motor stall condition, and then determine the degree of aging of the internal resistance growth and power attenuation of the battery on a real vehicle under the stable and controllable motor stall condition, alleviating the technical problem that the degree of battery aging cannot be determined on a real vehicle in the prior art. Description of the Drawings

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 It is a flowchart of a method for determining the degree of battery aging provided by an embodiment of the present invention;

[0042] Figure 2 It is a schematic structural diagram corresponding to the motor stall condition provided by an embodiment of the present invention;

[0043] Figure 3Flowchart of the method for calculating the internal resistance change and discharge power of a battery based on voltage signals and current signals provided by an embodiment of the present invention;

[0044] Figure 4 Schematic diagram of a device for determining the degree of battery aging provided by an embodiment of the present invention;

[0045] Figure 5 Schematic diagram of an electronic device provided by an embodiment of the present invention. Detailed implementation manners

[0046] The technical solutions of the present invention will be described clearly and completely below in conjunction with the embodiments. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] The prior art is still unable to determine the degree of battery aging on a real vehicle.

[0048] Based on this, the method for determining the degree of battery aging of the present invention can create a stable and controllable motor stall condition. Furthermore, under the stable and controllable motor stall condition, it is possible to determine the degree of aging of the internal resistance growth and power attenuation of the battery on a real vehicle, and at the same time, it will not affect the normal use of the real vehicle by the user.

[0049] For the convenience of understanding this embodiment, first, a method for determining the degree of battery aging disclosed in an embodiment of the present invention will be introduced in detail.

[0050] Embodiment 1:

[0051] According to an embodiment of the present invention, an embodiment of a method for determining the degree of battery aging is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0052] Figure 1 is a flowchart of a method for determining the degree of battery aging according to an embodiment of the present invention. As Figure 1 shown, the method includes the following steps:

[0053] Step S102, determining whether the current state of the battery meets a preset test condition;

[0054] In an embodiment of the present invention, the method for determining the degree of battery aging can be applied to a BMS (Battery Management System). After the vehicle stops, the BMS will be regularly woken up for inspection (not used by the user and will not affect normal use). During the inspection process, it will automatically determine whether the current state of the battery meets the preset test conditions.

[0055] The above current state includes: the static time of the battery, the SOC of the battery, and the temperature of the battery.

[0056] Step S104, if it is satisfied, apply high voltage and send a signal of motor stall to the electronic parking controller and the motor controller, so that the electronic parking controller and the motor controller control the motor to enter the working condition of motor stall;

[0057] Figure 2 The structural schematic diagram corresponding to the working condition of motor stall is shown in. The BMS sends a signal of motor stall to the electronic parking controller and the motor controller, and the electronic parking controller and the motor controller control the motor to enter the working condition of motor stall. Specifically, the electronic parking is turned on, and the motor outputs power according to a preset power, that is, under the action of the turned-on electronic parking, the vehicle does not move (that is, Figure 2 the tires in do not rotate), the motor outputs power according to a preset power. At this time, since the rotor is stuck and does not rotate, the motor behaves like a resistor, and the electrical energy is finally converted into heat energy.

[0058] Motor stall is a situation where the motor still outputs torque at 0 speed. This working condition can be artificially created by controlling the electronic handbrake to tighten (that is, turning on the electronic parking) and the motor outputting torque at the same time. When the motor stalls, the rotor does not rotate and there is no induced electromotive force. The motor behaves like a resistor. Usually, if the motor stalls for too long, it will cause too much current and overheat the rotor to demagnetize. However, generally, the motor can ensure a stall of more than 10s without thermal management. Some electric vehicles can generate heat to heat the battery by stalling the motor for a long time (the thermal management system transfers the heat to the battery). The estimation of the degree of battery aging only requires 2s of continuous discharge, so motor stall is used to create a unified working condition for estimating the degree of battery aging.

[0059] Step S106, under the working condition of motor stall, collect the voltage signal and current signal of the battery within a preset time;

[0060] The above preset time can be 2s, 5s, or 10s. The embodiment of the present invention does not specifically limit the above preset time.

[0061] Step S108, calculate the internal resistance change and discharge power of the battery according to the voltage signal and current signal;

[0062] Step S110: Determine the internal resistance growth ratio of the battery based on the calibrated internal resistance change table and the internal resistance change of the battery, and determine the power attenuation ratio of the battery based on the calibrated discharge power table and the discharge power of the battery. Then, use the internal resistance growth ratio and the power attenuation ratio of the battery as the aging degree of the battery.

[0063] The above-mentioned calibrated internal resistance change table is the internal resistance change corresponding to different battery temperatures and different battery SOCs calibrated when the electric vehicle leaves the factory. The above-mentioned calibrated discharge power table is the discharge power corresponding to different battery temperatures and different battery SOCs calibrated when the electric vehicle leaves the factory.

[0064] This process will be described in detail later and will not be elaborated here.

[0065] In an embodiment of the present invention, a method for determining the aging degree of a battery is provided, including: determining whether the current state of the battery meets a preset test condition; if it meets, apply high voltage and send a signal of motor stall to the electronic parking brake controller and the motor controller, so that the electronic parking brake controller and the motor controller control the motor to enter the motor stall working condition; in the motor stall working condition, collect the voltage signal and current signal of the battery within a preset time; calculate the internal resistance change and the discharge power of the battery according to the voltage signal and current signal; determine the internal resistance growth ratio of the battery based on the calibrated internal resistance change table and the internal resistance change of the battery, and determine the power attenuation ratio of the battery based on the calibrated discharge power table and the discharge power of the battery. Then, use the internal resistance growth ratio and the power attenuation ratio of the battery as the aging degree of the battery. Through the above description, it can be seen that the method for determining the aging degree of the battery in the present invention can create a stable and controllable motor stall working condition, and then determine the aging degree of the internal resistance growth and power attenuation of the battery on the actual vehicle under the stable and controllable motor stall working condition, alleviating the technical problem that the aging degree of the battery cannot be determined on the actual vehicle in the prior art.

[0066] In an optional embodiment of the present invention, the above step S102 of determining whether the current state of the battery meets the preset test condition specifically includes the following steps:

[0067] (1) Determine whether the static time of the battery reaches a preset static time threshold, whether the SOC of the battery is not less than a preset SOC threshold, and whether the temperature of the battery is not less than a preset temperature threshold;

[0068] (2) If the static time of the battery reaches the preset static time threshold, the SOC of the battery is not less than the preset SOC threshold, and the temperature of the battery is not less than the preset temperature threshold, it is determined that the current state of the battery meets the preset test condition.

[0069] Specifically, the above-mentioned preset static time threshold can be 1 hour. In the embodiments of the present invention, the above-mentioned preset static time threshold is not specifically limited and can be set according to requirements. The setting of the above-mentioned preset static time threshold is to ensure that the battery is completely depolarized. Since the usage degree of the battery is different and the polarization degree is also different, only when the battery is left standing sufficiently can the polarization caused by different usage degrees be completely eliminated, so as to ensure that the subsequent collected voltage signal is completely the voltage brought by the motor stall condition, and further ensure that the obtained result of the aging degree is more accurate.

[0070] The above-mentioned preset SOC threshold can be 30%, and the above-mentioned preset temperature threshold can be 10°. Because when the SOC of the battery ≥ 30% and the temperature of the battery ≥ 10°, the influence on the internal resistance of the battery is relatively small, which is also to ensure that the obtained result of the aging degree is more accurate.

[0071] On the contrary, if the static time of the battery does not reach the preset static time threshold, or the SOC of the battery is less than the preset SOC threshold, or the temperature of the battery is less than the preset temperature threshold, it is determined that the current state of the battery does not meet the preset test conditions.

[0072] In an alternative embodiment of the present invention, referring to Figure 3 the above step S108, calculating the internal resistance change and the discharge power of the battery according to the voltage signal and the current signal specifically includes the following steps:

[0073] Step S301, calculating the voltage change according to the voltage signal and calculating the current change according to the current signal;

[0074] Specifically, if the above-mentioned voltage signal is the voltage signal of the battery within 2s, then the voltage change calculated according to the voltage signal is: the difference between the voltage signal of the battery collected at 2s and the voltage signal of the battery collected at 0s. Similarly, the calculation of the current change is similar to the above calculation of the voltage change and will not be elaborated here.

[0075] Step S302, calculating the internal resistance change of the battery according to the voltage change and the current change;

[0076] Specifically, the internal resistance change: ΔR = ΔU / ΔI, where ΔR represents the internal resistance change, ΔU represents the voltage change, and ΔI represents the current change.

[0077] Step S303, calculating the average discharge power of the battery according to the voltage signal and the current signal, and taking the average discharge power of the battery as the discharge power of the battery.

[0078] Specifically, if the number of voltage signals of the battery collected within 2 s is 10 and the number of current signals is also 10, then each voltage signal is multiplied by its corresponding current signal, and then the average value of the multiplication results is calculated, thereby obtaining the average discharge power, and then this average discharge power is used as the discharge power of the battery.

[0079] In an alternative embodiment of the present invention, in step S110, based on the calibrated internal resistance change table and the internal resistance change of the battery, determining the internal resistance growth ratio of the battery specifically includes:

[0080] (1) Determining the target internal resistance change corresponding to the current state in the calibrated internal resistance change table;

[0081] Specifically, in the calibrated internal resistance change table, the target internal resistance change corresponding to the current SOC of the battery and the current temperature of the battery is determined.

[0082] (2) Calculating the current internal resistance growth ratio of the battery according to the internal resistance change of the battery and the target internal resistance change;

[0083] Specifically, the current internal resistance growth ratio of the battery = the internal resistance change of the battery / the target internal resistance change.

[0084] (3) Calculating the internal resistance growth ratio of the battery according to the current internal resistance growth ratio of the battery and the previous internal resistance growth ratio of the battery.

[0085] Specifically, the weighted average calculation can be performed on the current internal resistance growth ratio of the battery and the previous internal resistance growth ratio of the battery, and then the internal resistance growth ratio of the battery is calculated. The reason for performing the above weighted average calculation is to reflect the phenomenon that the internal resistance growth ratio of the battery is a slow-changing process and there will be no sudden change. Therefore, the previous internal resistance growth ratio of the battery needs to be considered, and the weighted calculation is performed to obtain the internal resistance growth ratio of the battery. For example, the internal resistance growth ratio of the battery = 50% * the current internal resistance growth ratio of the battery + 50% * the previous internal resistance growth ratio of the battery. The embodiments of the present invention do not specifically limit the above example.

[0086] In an alternative embodiment of the present invention, in step S110, based on the calibrated discharge power table and the discharge power of the battery, determining the power attenuation ratio of the battery specifically includes:

[0087] (1) Determining the target discharge power corresponding to the current state in the calibrated discharge power table;

[0088] (2) Calculating the current power attenuation ratio of the battery according to the discharge power of the battery and the target discharge power;

[0089] (3) Calculating the power attenuation ratio of the battery according to the current power attenuation ratio of the battery and the previous power attenuation ratio of the battery.

[0090] This process is similar to the process of determining the internal resistance growth ratio of the battery described above, and will not be elaborated here.

[0091] In the method for determining the degree of battery aging of the present invention, during the daily inspection process of the BMS, the degree of battery aging can be calculated without affecting the normal use of the user, and can provide effective support for the fault judgment, retirement, and energy storage reuse of the battery.

[0092] Embodiment 2:

[0093] The embodiment of the present invention also provides a device for determining the degree of battery aging. The device for determining the degree of battery aging is mainly used to execute the method for determining the degree of battery aging provided in Embodiment 1 of the present invention. The following is a specific introduction to the device for determining the degree of battery aging provided by the embodiment of the present invention.

[0094] Figure 4 It is a schematic diagram of a device for determining the degree of battery aging according to an embodiment of the present invention. The device mainly includes: a judgment unit 10, a sending unit 20, a collection unit 30, a calculation unit 40, and a determination unit 50, where:

[0095] The judgment unit is used to judge whether the current state of the battery meets the preset test conditions;

[0096] The sending unit is used to, if it is satisfied, apply high voltage and send a signal of motor stall to the electronic parking controller and the motor controller, so that the electronic parking controller and the motor controller control the motor to enter the working condition of motor stall;

[0097] The collection unit is used to collect the voltage signal and current signal of the battery within a preset time under the working condition of motor stall;

[0098] The calculation unit is used to calculate the internal resistance change and the discharge power of the battery according to the voltage signal and the current signal;

[0099] The determination unit is used to determine the internal resistance growth ratio of the battery based on the calibrated internal resistance change table and the internal resistance change of the battery, and determine the power attenuation ratio of the battery based on the calibrated discharge power table and the discharge power of the battery, and then use the internal resistance growth ratio and the power attenuation ratio of the battery as the degree of battery aging.

[0100] In an embodiment of the present invention, a device for determining the aging degree of a battery is provided, including: determining whether the current state of the battery meets a preset test condition; if it meets, sending a signal of motor stalling to an electronic parking brake controller and a motor controller, so that the electronic parking brake controller and the motor controller control the motor to enter a working condition of motor stalling; collecting voltage signals and current signals of the battery within a preset time in the working condition of motor stalling; calculating the internal resistance change and the discharge power of the battery according to the voltage signals and the current signals; determining the internal resistance growth ratio of the battery based on a calibrated internal resistance change table and the internal resistance change of the battery, and determining the power attenuation ratio of the battery based on a calibrated discharge power table and the discharge power of the battery, and further using the internal resistance growth ratio and the power attenuation ratio of the battery as the aging degree of the battery. It can be seen from the above description that the device for determining the aging degree of the battery of the present invention can create a stable and controllable working condition of motor stalling, and further determine the aging degree of the internal resistance growth and power attenuation of the battery on a real vehicle in the stable and controllable working condition of motor stalling, alleviating the technical problem that the aging degree of the battery cannot be determined on a real vehicle in the prior art.

[0101] Optionally, the determination unit is further configured to: determine whether the static time of the battery reaches a preset static time threshold, whether the SOC of the battery is not less than a preset SOC threshold, and whether the temperature of the battery is not less than a preset temperature threshold; if the static time of the battery reaches the preset static time threshold, the SOC of the battery is not less than the preset SOC threshold, and the temperature of the battery is not less than the preset temperature threshold, it is determined that the current state of the battery meets the preset test condition.

[0102] Optionally, the working condition of motor stalling is: the electronic parking brake is turned on, and the motor outputs work according to a preset power.

[0103] Optionally, the calculation unit is further configured to: calculate the voltage change according to the voltage signal, and calculate the current change according to the current signal; calculate the internal resistance change of the battery according to the voltage change and the current change; calculate the average value of the discharge power of the battery according to the voltage signal and the current signal, and use the average value of the discharge power of the battery as the discharge power of the battery.

[0104] Optionally, the determination unit is further configured to: determine a target internal resistance change corresponding to the current state in the calibrated internal resistance change table; calculate the current internal resistance growth ratio of the battery according to the internal resistance change and the target internal resistance change of the battery; calculate the internal resistance growth ratio of the battery according to the current internal resistance growth ratio and the previous internal resistance growth ratio of the battery.

[0105] Optionally, the determination unit is further configured to: determine a target discharge power corresponding to the current state in the calibrated discharge power table; calculate the current power attenuation ratio of the battery according to the discharge power and the target discharge power of the battery; calculate the power attenuation ratio of the battery according to the current power attenuation ratio and the previous power attenuation ratio of the battery.

[0106] The device provided by the embodiments of the present invention has the same implementation principle and the same technical effects as those of the foregoing method embodiments. For a brief description, for the parts not mentioned in the device embodiments, reference may be made to the corresponding contents in the foregoing method embodiments.

[0107] As Figure 5 shown, an electronic device 600 provided by an embodiment of the present application includes: a processor 601, a memory 602, and a bus. The memory 602 stores machine-readable instructions executable by the processor 601. When the electronic device runs, the processor 601 communicates with the memory 602 through the bus, and the processor 601 executes the machine-readable instructions to perform the steps of the method for determining the degree of battery aging as described above.

[0108] Specifically, the foregoing memory 602 and processor 601 can be general memories and processors, which are not specifically limited herein. When the processor 601 runs the computer program stored in the memory 602, it can execute the method for determining the degree of battery aging as described above.

[0109] The processor 601 may be an integrated circuit chip with the ability to process signals. In the implementation process, each step of the above method can be completed by the integrated logic circuit in the hardware of the processor 601 or instructions in the form of software. The above-mentioned processor 601 may be a general-purpose processor, including a central processing unit (CPU for short), a network processor (NP for short), etc.; it may also be a digital signal processor (DSP for short), an application specific integrated circuit (ASIC for short), a field-programmable gate array (FPGA for short), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed and completed by the hardware decoding processor, or executed and completed by a combination of the hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory 602, and the processor 601 reads the information in the memory 602 and combines its hardware to complete the steps of the above method.

[0110] Corresponding to the above method for determining the degree of battery aging, an embodiment of the present application further provides a computer-readable storage medium, which stores machine-executable instructions. When the computer-executable instructions are called and run by a processor, the computer-executable instructions cause the processor to run the steps of the above method for determining the degree of battery aging.

[0111] The device for determining the degree of battery aging provided by the embodiments of the present application may be specific hardware on the device or software or firmware installed on the device, etc. For the device provided by the embodiments of the present application, the implementation principle and the technical effects produced are the same as those of the foregoing method embodiments. For the sake of brief description, for the parts not mentioned in the device embodiments, reference may be made to the corresponding content in the foregoing method embodiments. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can all refer to the corresponding processes in the above method embodiments, and will not be repeated here.

[0112] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the couplings or direct couplings or communication connections shown or discussed with each other can be through some communication interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical or other forms.

[0113] For another example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of the devices, methods, and computer program products according to multiple embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0114] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place, or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0115] In addition, the functional units in the embodiments provided in the present application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0116] When the above-mentioned functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing an electronic device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the vehicle marking method described in various embodiments of this application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM for short), random access memories (RAM for short), magnetic disks, or optical discs.

[0117] It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0118] Finally, it should be noted that: the above-mentioned embodiments are only specific implementation manners of this application, used to illustrate the technical solution of this application, rather than limiting it. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by this application can still modify the technical solution recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes, or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of this application. All should be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A method for determining the degree of battery aging, characterized in that, Including: Judging whether the current state of the battery meets a preset test condition; If it meets the condition, apply high voltage and send a signal of motor stall to the electronic parking controller and the motor controller, so that the electronic parking controller and the motor controller control the motor to enter the working condition of motor stall; Under the working condition of motor stall, collect the voltage signal and current signal of the battery within a preset time; Calculate the internal resistance change and the discharge power of the battery according to the voltage signal and the current signal; Determine the internal resistance growth ratio of the battery based on the calibrated internal resistance change table and the internal resistance change of the battery, and determine the power attenuation ratio of the battery based on the calibrated discharge power table and the discharge power of the battery, and then use the internal resistance growth ratio and the power attenuation ratio of the battery as the aging degree of the battery; Among them, judging whether the current state of the battery meets a preset test condition includes: Judging whether the static time of the battery reaches a preset static time threshold, whether the SOC of the battery is not less than a preset SOC threshold, and whether the temperature of the battery is not less than a preset temperature threshold; If the static time of the battery reaches the preset static time threshold, the SOC of the battery is not less than the preset SOC threshold, and the temperature of the battery is not less than the preset temperature threshold, it is determined that the current state of the battery meets the preset test condition.

2. The method according to claim 1, wherein The working condition of motor stall is: electronic parking is turned on, and the motor outputs work according to a preset power.

3. The method according to claim 1, characterized in that Calculating the internal resistance change and the discharge power of the battery according to the voltage signal and the current signal includes: Calculating the voltage change according to the voltage signal and calculating the current change according to the current signal; Calculating the internal resistance change of the battery according to the voltage change and the current change; Calculating the average discharge power of the battery according to the voltage signal and the current signal, and using the average discharge power of the battery as the discharge power of the battery.

4. The method according to claim 1, characterized in that, Determining the internal resistance growth ratio of the battery based on the calibrated internal resistance change table and the internal resistance change of the battery includes: Determining the target internal resistance change corresponding to the current state in the calibrated internal resistance change table; Calculating the current internal resistance growth ratio of the battery according to the internal resistance change and the target internal resistance change of the battery; Calculating the internal resistance growth ratio of the battery according to the current internal resistance growth ratio and the previous internal resistance growth ratio of the battery.

5. The method according to claim 1, wherein Determining the power attenuation ratio of the battery based on the calibrated discharge power table and the discharge power of the battery includes: Determining the target discharge power corresponding to the current state in the calibrated discharge power table; Calculating the current power attenuation ratio of the battery according to the discharge power and the target discharge power of the battery; Calculating the power attenuation ratio of the battery according to the current power attenuation ratio and the previous power attenuation ratio of the battery.

6. A device for determining the degree of battery aging, characterized in that, Including: A judging unit for judging whether the current state of the battery meets a preset test condition; A sending unit, configured to apply high voltage if the conditions are met, and send a signal indicating motor stall to an electronic parking brake controller and a motor controller, so that the electronic parking brake controller and the motor controller control the motor to enter a motor stall condition; A collecting unit, configured to collect voltage signals and current signals of the battery within a preset time in the motor stall condition; A calculating unit, configured to calculate an internal resistance change of the battery and a discharge power of the battery according to the voltage signals and the current signals; A determining unit, configured to determine a growth ratio of the internal resistance of the battery based on a calibrated internal resistance change table and the internal resistance change of the battery, and determine a power attenuation ratio of the battery based on a calibrated discharge power table and the discharge power of the battery, and further use the growth ratio of the internal resistance of the battery and the power attenuation ratio of the battery as the aging degree of the battery; Wherein, the judging unit is further configured to: Judge whether a static time of the battery reaches a preset static time threshold, whether an SOC of the battery is not less than a preset SOC threshold, and whether a temperature of the battery is not less than a preset temperature threshold; If the static time of the battery reaches the preset static time threshold, the SOC of the battery is not less than the preset SOC threshold, and the temperature of the battery is not less than the preset temperature threshold, it is determined that the current state of the battery meets the preset test conditions.

7. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 above are implemented.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are called and run by the processor, the machine-executable instructions cause the processor to run the method according to any one of claims 1 to 5 above.

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