CN112485685B - Power bearing capacity parameter determining method and device and electronic equipment - Google Patents
Power bearing capacity parameter determining method and device and electronic equipment Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
Abstract
The application provides a method, a device and electronic equipment for determining power bearing capacity parameters, which relate to the technical field of new energy automobiles, are based on analysis and calculation of battery cell temperature, voltage, current, SOC, fault level of a battery system, power request of a whole vehicle system and the like, can periodically estimate SOP of a battery under the current condition, fully consider environment, battery cell capacity, system requirements and the like, and improve the accuracy of SOP estimated power; taking the differentiation of the battery cell temperature and the SOC into consideration, an estimation mode is provided based on the maximum value and the minimum value of the battery cell temperature and the maximum value and the minimum value of the SOC, the SOP of the battery in a charging state and a discharging state is estimated, the safety of the battery in different states is ensured to the maximum extent, and the overcharge or overdischarge of the battery cell is prevented.
Description
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a method and a device for determining a power bearing capacity parameter and electronic equipment.
Background
The current environment and energy problems are increasingly highlighted, and new energy automobiles are rapidly developed as strategic industries in order to cope with energy crisis and environmental crisis.
The power Battery is a core component of a power system of a new energy automobile, and the performance of the power Battery is important for safe and efficient operation of the automobile, so that a Battery management system (Battery MANAGEMENT SYSTEM, BMS) is also receiving more and more attention. The accurate estimation of the power bearing capacity (SOP) can enable the hybrid vehicle to obtain larger power on the premise of protecting the battery.
The existing SOP estimation method estimates the current SOP of the battery through the open circuit voltage and the internal resistance corresponding to the State of charge (SOC) under the current condition, but the current change is severe in the driving process, and a larger error can be generated by using a composite pulse method.
Disclosure of Invention
The invention aims at providing a power bearing capacity parameter determining method, a power bearing capacity parameter determining device and electronic equipment, which can determine the power bearing capacity parameter according to environment, battery cell energy and system requirements, and consider the battery cell temperature at the same time, so that the safety of a battery in different states is ensured to the maximum, and the overcharge or overdischarge of the battery cell is prevented.
Embodiments of the invention may be implemented as follows:
in a first aspect, the present invention provides a method for determining a power bearing capacity parameter, where the method includes:
Acquiring temperature information of a power battery, a lowest battery cell state of charge (SOC) and a remaining life (SOH), wherein the temperature information comprises a highest battery cell temperature and a lowest battery cell temperature;
Determining the available power of the power battery corresponding to the current condition according to the temperature information, the lowest battery cell SOC and a preset power bearing capacity topology, wherein the power bearing capacity topology stores the corresponding relation between the highest battery cell temperature, the lowest battery cell SOC and the available power of the power battery under the condition;
determining the discharging power of the power battery in the current SOH state according to the available power and the current SOH of the power battery;
performing first limiting treatment on the discharge power according to the limited state of the power bearing capacity of the power battery;
performing second limiting treatment on the discharge power after the first limiting treatment according to the fault level of the power battery;
And determining the discharge power after the second limiting treatment as a power bearing capacity parameter of the power battery.
In an alternative embodiment, the available power includes 2s discharge power, 10s discharge power, and 30s discharge power; the step of determining the discharging power of the power battery in the current SOH state according to the available power and the current SOH of the power battery comprises the following steps:
Multiplying the 2s discharge power, the 10s discharge power and the 30s discharge power with the current SOH of the power battery respectively to determine the discharge power of the power battery in the current SOH state;
the discharging power of the power battery in the current SOH state comprises 2s discharging power in the current SOH state, 10s discharging power in the current SOH state and 30s discharging power in the current SOH state.
In an alternative embodiment, the step of performing the first limiting process on the discharge power according to the limited state of the power bearing capacity of the power battery includes:
When the power battery is in a limited state, reducing the values of the 2s discharge power in the current SOH state and the 10s discharge power in the current SOH state to 30s discharge power in the current SOH state at a preset rate;
And when the power battery is in an unlimited state, the values of the 2s discharge power in the current SOH state, the 10s discharge power in the current SOH state and the 30s discharge power in the current SOH state are not limited.
In an alternative embodiment, the step of performing the second limiting process on the discharge power after the first limiting process according to the fault level of the power battery includes:
When the fault level is zero-level fault, the discharge power is not limited;
When the fault level is greater than zero level and less than or equal to three levels, reducing the discharge power by a preset proportion;
And when the fault level is greater than three levels, reducing the discharge power to 0.
In an alternative embodiment, before the step of performing the first limiting process on the discharge power according to the limited state of the power bearing capacity of the power battery, the method further includes:
And determining the limited capacity state of the power battery, and determining that the power battery is in a limited state when the cold start flag bit or the peak power limit value flag bit of the power battery is a preset flag bit, or else, determining that the power battery is in a non-limited state.
In a second aspect, the present invention provides a power bearing capacity parameter determination apparatus for performing the power bearing capacity parameter determination method according to any one of the foregoing embodiments, the power bearing capacity parameter determination apparatus comprising:
The acquisition module is used for acquiring temperature information, the lowest cell temperature, the lowest cell state of charge (SOC) and the residual life (SOH) of the power battery; wherein the temperature information comprises a highest cell temperature and a lowest cell temperature;
The processing module is used for determining the available power of the power battery corresponding to the current condition according to the temperature information, the lowest battery cell SOC and a preset power bearing capacity topology, wherein the power bearing capacity topology stores the corresponding relation between the highest battery cell temperature, the lowest battery cell SOC and the available power of the power battery under the condition;
the processing module is also used for determining the discharging power of the power battery in the current SOH state according to the available power and the current SOH of the power battery;
The processing module is further used for performing first limiting processing on the discharge power according to the limited state of the power bearing capacity of the power battery;
the processing module is also used for carrying out second limiting processing on the discharge power after the first limiting processing according to the fault level of the power battery;
and the determining module is used for determining the discharge power after the second limiting treatment as the power bearing capacity parameter of the power battery.
In an alternative embodiment, the available power includes 2s discharge power, 10s discharge power, and 30s discharge power;
The processing module is used for multiplying the 2s discharging power, the 10s discharging power and the 30s discharging power with the current SOH of the power battery respectively to determine the discharging power of the power battery in the current SOH state; the discharging power of the power battery in the current SOH state comprises 2s discharging power in the current SOH state, 10s discharging power in the current SOH state and 30s discharging power in the current SOH state.
In an alternative embodiment, the processing module is configured to reduce, when the power battery is in a limited state, the value of the 2s discharge power in the current SOH state and the value of the 10s discharge power in the current SOH state to 30s discharge power in the current SOH state at a preset rate; and when the power battery is in an unlimited state, the values of the 2s discharge power in the current SOH state, the 10s discharge power in the current SOH state and the 30s discharge power in the current SOH state are not limited.
In an alternative embodiment, the processing module is configured to not limit the discharge power when the fault level is a zero-level fault; when the fault level is greater than zero level and less than or equal to three levels, reducing the discharge power by a preset proportion; and when the fault level is greater than three levels, reducing the discharge power to 0.
In a third aspect, the present invention provides an electronic device, including a processor and a memory storing computer readable program instructions that, when executed by the processor, implement the steps of the power bearing capacity parameter determination method according to any one of the foregoing embodiments.
Compared with the prior art, the method and the device for determining the power bearing capacity parameter have the following beneficial effects:
The method, the device and the electronic equipment for determining the power bearing capacity parameter can periodically estimate the SOP of the battery under the current condition based on the analysis and calculation of the battery cell temperature, the SOC, the fault level of the battery system, the power request of the whole vehicle system and the like, fully considers the environment, the battery cell capacity, the system requirement and the like, and improves the accuracy of the power for SOP estimation; taking the differentiation of the battery cell temperature and the SOC into consideration, an estimation mode is provided based on the maximum value and the minimum value of the battery cell temperature and the maximum value and the minimum value of the SOC, the SOP of the battery in a charging state and a discharging state is estimated, the safety of the battery in different states is ensured to the maximum extent, and the overcharge or overdischarge of the battery cell is prevented.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for determining a power bearing capacity parameter according to the present embodiment;
Fig. 2 is a flowchart of another method for determining a power bearing capacity parameter according to the present embodiment;
Fig. 3 is a flowchart of another method for determining a power bearing capacity parameter according to the present embodiment;
fig. 4 is a flowchart of another method for determining a power bearing capacity parameter according to the present embodiment;
Fig. 5 is a schematic functional block diagram of a power bearing capacity parameter determining apparatus according to the present embodiment;
Fig. 6 is a schematic diagram of an electronic device according to the present embodiment.
Icon: 200-a power bearing capacity parameter determining device; 210-an acquisition module; 220-a processing module; 230-a determination module; 310-a processor; 311-memory; 312-bus; 313-communication interface.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
At present, environmental and energy problems are increasingly highlighted, and new energy automobiles are rapidly developed as strategic industries in order to cope with energy crisis and environmental crisis. Due to limitations in the power battery's own characteristics and the relatively slow acceleration of the charging infrastructure, problems such as battery endurance and charging are temporarily problematic. In contrast, the plug-in hybrid electric vehicle combines the engine and the power battery together, overcomes the respective disadvantages, fully utilizes the advantages of the engine and the power battery, reduces the emission, and simultaneously solves the defects of the pure electric vehicle.
The power Battery is a core component of a power system of a plug-in hybrid electric vehicle, and the performance of the power Battery is important for safe and efficient operation of the vehicle, so that a Battery management system (Battery MANAGEMENT SYSTEM, BMS) is also receiving more and more attention. In the management system of the battery, the State of charge (SOC), the remaining life (SOH) and the power bearing capacity (SOP) of the battery are all important parameters of the battery, wherein the accurate estimation of the SOP can enable the hybrid electric vehicle to obtain larger power on the premise of protecting the battery, and the SOP of the battery is nonlinear because the power State of the electric vehicle is indistinguishable from the SOC, SOH, temperature, fault State and the like of the battery.
In the prior art, the SOP of the battery is estimated by a composite pulse method, and the current SOP of the battery is estimated by the open-circuit voltage and the internal resistance corresponding to the SOC under the current condition. However, the current change is severe in the driving process, a large error is generated by using a composite pulse method, and the method does not consider the limitation of the threshold value and the SOC of the current in the charging and discharging process of the battery, so that the estimated power error is large.
In order to improve the above problems, the embodiment of the application provides a method for determining a power bearing capacity parameter, which determines the power bearing capacity parameter according to the environment, the energy of a battery cell and the system requirement, and considers the temperature of the battery cell at the same time, thereby maximally ensuring the safety of the battery in different states and preventing the overcharge or overdischarge of the battery cell.
In determining the power bearing capacity parameter of the power battery, the different states such as logic, operation and model of the charging state and the discharging state are basically consistent, the application mainly uses the over-discharge prevention of the battery cell as an example, the principle of preventing the battery from being overcharged is basically consistent with the principle of preventing the over-discharge of the battery cell, and the embodiment will not be described in detail.
Referring to fig. 1, fig. 1 shows a method for determining a power bearing capacity parameter according to the present embodiment, where the method for determining a power bearing capacity parameter according to the present embodiment includes the following steps:
Step 110: and acquiring temperature information of the power battery, the lowest battery cell state of charge (SOC) and the residual life (SOH), wherein the temperature information comprises the highest battery cell temperature and the lowest battery cell temperature.
Step 120: and determining the available power of the corresponding power battery under the current condition according to the temperature information, the lowest battery cell SOC and a preset power bearing capacity topology, wherein the power bearing capacity topology stores the corresponding relation between the highest battery cell temperature, the lowest battery cell SOC and the available power of the power battery under the condition.
Step 130: and determining the discharging power of the power battery in the current SOH state according to the available power and the current SOH of the power battery.
Step 140: and performing first limiting treatment on the discharge power according to the limited state of the power bearing capacity of the power battery.
Step 150: and performing second limiting treatment on the discharge power after the first limiting treatment according to the fault level of the power battery.
Step 160: and determining the discharge power after the second limiting treatment as a power bearing capacity parameter of the power battery.
According to the power bearing capacity parameter determining method provided by the application, based on analysis and calculation of the battery cell temperature, the SOC, the fault level of the battery system, the power request of the whole vehicle system and the like, the SOP of the battery under the current condition can be periodically estimated, the environment, the battery cell capacity, the system requirement and the like are fully considered, and the accuracy of the power for SOP estimation is improved; the differentiation of the battery cell temperature and the SOC is considered, an estimation mode is provided based on the maximum value and the minimum value of the battery cell temperature and the maximum value and the minimum value of the SOC, the power bearing capacity parameters of the power battery in a charging state and a discharging state can be reasonably estimated, the safety of the battery in different states is ensured to the maximum extent, and the overcharge or overdischarge of the battery cell is prevented.
In some possible implementations, the power battery includes a plurality of electric cells, the state parameters of the plurality of electric cells may be different due to differences in performance, discharging capability, and the like, the highest electric cell temperature of the power battery refers to the temperature-highest electric cell temperature among all electric cells included in the power battery, the lowest electric cell temperature refers to the temperature-lowest electric cell temperature among all electric cells included in the power battery, the lowest electric cell SOC refers to the electric cell SOC with the lowest electric quantity among all electric cells included in the power battery, and the remaining life SOH refers to the remaining life of the power battery.
After the highest cell temperature, the lowest cell temperature and the lowest cell state of charge (SOC) of the power battery are obtained, the available power of the power battery is determined according to the highest cell temperature, the lowest cell SOC and a preset power bearing capacity topology. The power bearing capacity topology stores the corresponding relation between the highest battery cell temperature, the lowest battery cell SOC and the available power; in some possible implementations, the available power includes 2s discharge power, 10s discharge power, and 30s discharge power, and the 2s discharge power, 10s discharge power, and 30s discharge power of the power cell are determined by searching the power bearing capability topology according to the highest cell temperature, the lowest cell temperature, and the lowest cell SOC. Alternatively, taking 2s of discharge power as an example, the 2s of discharge power refers to the discharge capability of the power battery corresponding to the current condition (highest cell temperature, lowest cell state of charge SOC).
After the 2s discharging power, the 10s discharging power and the 30s discharging power of the power battery are determined, the discharging power of the power battery in the current SOH state is determined according to the 2s discharging power, the 10s discharging power, the 30s discharging power and the current SOH of the power battery.
In some possible implementations, the discharge power of the power battery in the current SOH state includes a 2s discharge power in the current SOH state, a 10s discharge power in the current SOH state, and a 30s discharge power in the current SOH state.
In one possible implementation, step 130 may be implemented in such a way that: multiplying the 2s discharging power with the current SOH of the power battery to obtain the 2s discharging power of the power battery in the current SOH state; multiplying the 10s discharging power with the current SOH of the power battery to obtain the 10s discharging power of the power battery in the current SOH state; and multiplying the 30s discharge power by the current SOH of the power battery to obtain the 30s discharge power of the power battery in the current SOH state.
After the discharging power of the power battery is determined, the SOP is limited and corrected according to the limited state of the power bearing capacity of the power battery and the fault level. It is first necessary to obtain a limited state of the power-bearing capacity of the power cell.
In some possible implementations, referring to fig. 2, the method for determining a power bearing capability parameter further includes:
step 131: and determining a limited state of the power bearing capacity of the power battery, and determining that the power battery is in the limited state when the power battery is not allowed to use the peak power flag bit or the no-peak power use flag bit is a preset flag bit, or else, determining that the power battery is in the non-limited state.
In one possible implementation, the battery SOC is compared with the SOC value under cold start conditions determined by a cell temperature lookup table, and the state of the power battery is divided into four intervals: interval D: if the power SOC value is not greater than the SOC obtained by table lookup, the cold start condition is not satisfied in the interval, and the cold start mark position 1 indicates that cold start is not allowed; interval C: the battery SOC value is not more than 15 and the battery core temperature is not more than 5 ℃ when the interval D is not satisfied; interval B: the battery SOC value is not more than 35 and the battery core temperature is not more than-20 ℃ when the interval D is not satisfied; interval A: all three are not satisfied as A. When the battery state is in the interval B and the interval C, a command of cold start is sent before the whole vehicle is controlled, and then the peak power is not allowed to be used in the later 80S, the system does not allow the peak power to be used in the marker position 1, and the power battery is not allowed to output the peak power.
In another possible implementation manner, the use time of the peak power is calculated through an accumulation manner, when the continuous use time of the peak power is greater than a preset duration, the use time of the peak power is exceeded by a mark position 1, the peak power is not allowed to be used again in a later set time, and the use of the peak power is not allowed by a mark position 1.
The current power is compared with the capacity of the battery, so that the battery core is ensured to work in a reasonable range, and the performance of the battery core is ensured.
When the power bearing capacity parameter of the power battery is estimated, determining the restricted state of the power bearing capacity of the power battery according to the state of the flag bit, and when the power battery is not allowed to use the peak power flag bit or the no peak power use flag bit is a preset flag bit, for example, in the embodiment, the preset flag bit is set to 1, and the power battery is determined to be in the restricted state, otherwise, the power battery is determined to be in the non-restricted state.
In one possible implementation, after determining the limited state of the power bearing capacity of the power battery, referring to fig. 3 according to the limited state of the power battery, step 140 includes the steps of:
Step 140-1: when the power battery is in a limited state, the values of the 2s discharge power in the current SOH state and the 10s discharge power in the current SOH state are reduced to 30s discharge power in the current SOH state at a preset rate.
In the drawings and the following description, the 2s discharge power in the current SOH state is abbreviated as 2s discharge power, the 10s rate in the current SOH state is abbreviated as 10s discharge power, and the 30s discharge power in the current SOH state is abbreviated as 30s discharge power.
In one possible implementation, the battery management system outputs the available power of the power battery to the CAN bus, and the battery management system of the vehicle outputs corresponding power in response to the system demand.
If the power bearing capacity of the power battery is in a limited state, the reliability and the safety of the power battery may be affected if the conventional 2s discharge power and 10s discharge power are still output, in which case, the values of the 2s discharge power and the 10s discharge power are reduced to 30s discharge power at a preset rate, that is, the power battery discharge power is reduced, so as to avoid damage to the power battery.
In one possible implementation, the values of the 2s discharge power and the 10s discharge power may be reduced to 30s discharge power at a rate of 100 Kw/s.
Step 140-2: when the power battery is in an unlimited state, the values of the 2s discharge power in the current SOH state, the 10s discharge power in the current SOH state and the 30s discharge power in the current SOH state are not limited.
If the power bearing capacity of the power battery is not limited, the values of the 2s discharge power in the current SOH state, the 10s discharge power in the current SOH state and the 30s discharge power in the current SOH state are not limited, and the discharge power determined in the step 130 is output to the CAN bus.
In some possible implementations, the power battery may have a system fault of a different level, and when the power battery fails, the power battery has an effect on its discharging capability, and in order to have a worse effect on the power battery, referring to fig. 4, the step of performing the second limiting process on the available power after the first limiting process according to the fault level of the power battery includes:
step 150-1: when the fault level is zero-order fault, the discharge power is not limited.
If the power battery has no fault, the discharge power is not limited, and it should be noted that the discharge power at this time refers to the discharge power after the first limitation processing in step 140.
Step 150-2: and when the fault level is greater than zero level and less than or equal to three levels, reducing the discharge power by a preset proportion.
When the fault level of the power battery is greater than zero level and less than or equal to three levels, the discharge power after the first limiting treatment is further reduced.
For example, when a primary failure occurs in the power battery, the discharge power is reduced by 10%, when a secondary failure occurs in the power battery, the discharge power is reduced by 30%, and when a tertiary failure occurs in the power battery, the discharge power is reduced by 80%, wherein the higher the failure level, the more severe the characterization.
Step 150-3: when the failure level is greater than three, the discharge power is reduced to 0.
If the fault level is greater than three levels, the situation of representing the power battery is worse, and at the moment, the safety and the reliability of the power battery cannot be guaranteed, and under the situation, the discharge power is reduced to 0, so that potential safety hazards caused by continuous operation of the power battery are avoided.
It should be noted that the above zero-level, one-level, two-level and three-level faults are only exemplary descriptions of the present embodiment, and not limiting the present embodiment, and in the practical application process, the second limitation processing may be performed on the available power according to the fault types or levels of different power batteries, which is not limited in the present embodiment.
After the first limiting process and the second limiting process are performed on the discharging power, it CAN be understood that the available power of the power battery is correspondingly corrected according to the limited state of the power bearing capacity of the power battery and the fault state of the power battery, the processed available power is determined as the power bearing capacity parameter of the power battery and is output to the CAN bus, the safety of the battery in different states is ensured to the greatest extent, and the overcharge or overdischarge of the battery core is prevented.
It should be noted that, the power estimation includes charging and discharging, and the calculation logic of both are always the same, and the above embodiment describes the determination of the power bearing capability parameter provided by the present application in a discharging state, so that the detailed description of the determination of the power bearing capability parameter in a charging state is omitted for brevity.
In order to perform the foregoing embodiments and the corresponding steps in each possible implementation manner, an implementation manner of the power capability parameter determining apparatus is provided below, and referring to fig. 5, fig. 5 is a schematic diagram of a power capability parameter determining apparatus 200 according to a preferred embodiment of the present invention. It should be noted that, the basic principle and the technical effects of the power bearing capacity parameter determining apparatus 200 provided in this embodiment are substantially the same as those of the air conditioner control method provided in the above embodiment, and for brevity, reference may be made to the corresponding contents in the above embodiment where the description of this embodiment is omitted. The power bearing capacity parameter determining apparatus 200 provided in this embodiment includes an obtaining module 210, a processing module 220 and a determining module 230.
The acquiring module 210 is configured to acquire temperature information of the power battery, a lowest battery state of charge SOC, and a remaining life SOH, where the temperature information includes a highest battery temperature and a lowest battery temperature.
It will be appreciated that, in one possible implementation, the obtaining module 210 may be configured to perform the step 110 in the foregoing respective figures, so as to achieve the corresponding technical effects.
And the processing module 220 is configured to determine the available power of the power battery corresponding to the current condition according to the temperature information, the lowest battery cell SOC, and a preset power bearing capacity topology, where the power bearing capacity topology stores the correspondence between the highest battery cell temperature, the lowest battery cell SOC, and the available power of the power battery under the current condition.
It will be appreciated that in one possible implementation, the processing module 220 may be configured to perform the step 120 in the foregoing figures, so as to achieve the corresponding technical effects.
The processing module 220 is further configured to determine a discharge power of the power battery in a current SOH state according to the available power and the current SOH of the power battery.
It will be appreciated that in one possible implementation, the processing module 220 may be configured to perform the step 130 in the foregoing figures, so as to achieve the corresponding technical effects.
The processing module 220 is further configured to determine a restricted state of the power capability of the power battery, and determine that the power battery is in the restricted state when the power battery is not allowed to use the peak power flag or the no peak power use flag is a preset flag, and otherwise is in the unrestricted state.
It will be appreciated that in one possible implementation, the processing module 220 may be configured to perform the step 131 in the foregoing figures, so as to achieve the corresponding technical effect.
The processing module 220 is further configured to perform a first limitation process on the discharge power according to the limited state of the power bearing capacity of the power battery.
It will be appreciated that in one possible implementation, the processing module 220 may be configured to perform the step 140 in the foregoing figures, so as to achieve the corresponding technical effects.
In some possible implementations, the processing module 220 is specifically configured to multiply the 2s discharge power, the 10s discharge power, and the 30s discharge power with the current SOH of the power battery to determine the discharge power, respectively; the discharging power comprises 2s discharging power in the current SOH state, 10s discharging power in the current SOH state and 30s discharging power in the current SOH state.
In some possible implementations, the processing module 220 is specifically configured to reduce the values of the 2s discharge power in the current SOH state and the 10s discharge power in the current SOH state to the 30s discharge power in the current SOH state at a preset rate when the power battery is in the limited state; when the power battery is in an unlimited state, the values of the 2s discharge power in the current SOH state, the 10s discharge power in the current SOH state and the 30s discharge power in the current SOH state are not limited.
It will be appreciated that in one possible implementation, the processing module 220 may be configured to perform the steps 140-1 to 140-2 in the foregoing respective figures, so as to achieve corresponding technical effects.
The processing module 220 is further configured to perform a second limiting process on the discharge power after the first limiting process according to the fault level of the power battery.
It will be appreciated that in one possible implementation, the processing module 220 may be configured to perform the step 150 in the respective figures described above, so as to achieve the corresponding technical effects.
In some possible implementations, the processing module 220 is configured to not limit the discharge power when the fault level is a zero-level fault; when the fault level is greater than zero level and less than or equal to three levels, reducing the discharge power by a preset proportion; when the failure level is greater than three, the discharge power is reduced to 0.
It will be appreciated that in one possible implementation, the processing module 220 may be configured to perform steps 150-1 to 150-3 in the foregoing figures to achieve corresponding technical effects.
A determining module 230, configured to determine the discharge power after the second limitation process as a power bearing capacity parameter of the power battery.
It will be appreciated that in one possible implementation, the determining module 230 may be configured to perform the step 160 in the respective figures described above, so as to achieve the corresponding technical effect.
Referring to fig. 6, an embodiment of the present application provides an electronic device, and fig. 6 shows a schematic structural diagram of the electronic device provided in this embodiment. The electronic device comprises a processor 310, a memory 311, a bus 312. The processor 310, the memory 311 are connected by a bus 312, the processor 310 being adapted to execute executable modules, such as computer programs, stored in the memory 311.
The processor 310 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the method for determining the power capability parameter provided in this embodiment may be implemented by an integrated logic circuit of hardware in the processor 310 or an instruction in the form of software. The processor 310 may be a general-purpose processor, including a central processing unit (Central Processing Unit, abbreviated as CPU), a network processor (Network Processor, abbreviated as NP), etc.; but may also be a digital signal Processor (DIGITAL SIGNAL Processor, DSP), application Specific Integrated Circuit (ASIC), field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components.
Memory 311 may include high-speed random access memory (RAM: random Access Memory), and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
Bus 312 may be ISA (Industry Standard Architecture) bus, PCI (Peripheral Component Interconnect) bus, EISA (Extended Industry Standard Architecture) bus, or the like. Only one double-headed arrow is shown in fig. 6, but not only one bus 312 or one type of bus 312.
The memory 311 is used for storing programs, such as programs corresponding to the power bearing capacity parameter determining device. The power withstand capability parameter determining means includes at least one software function module which may be stored in the memory 311 in the form of software or firmware (firmware) or cured in an Operating System (OS) of the electronic device. The processor 310, upon receiving the execution instruction, executes the program to implement the steps of the power capability parameter determination method.
Possibly, the electronic device provided by the embodiment of the application further comprises a communication interface 313. The communication interface 313 is connected to the processor 310 by a bus. The communication interface 313 may be used to connect to external devices such as a user's cell phone or other terminal, etc.
It should be understood that the structure shown in fig. 6 is a schematic structural diagram of only a portion of an electronic device, which may also include more or fewer components than those shown in fig. 6, or have a different configuration than that shown in fig. 6. The components shown in fig. 6 may be implemented in hardware, software, or a combination thereof.
The embodiment of the application also provides a storage medium, on which a computer program is stored, which when executed by a processor implements the power bearing capacity parameter determination method according to any one of the foregoing embodiments.
In summary, the method, the device and the electronic equipment for determining the power bearing capacity parameter provided by the embodiment can periodically estimate the SOP of the battery under the current condition based on the analysis and calculation of the temperature, the voltage, the current, the SOC of the battery system, the fault level of the whole vehicle system, the power request of the whole vehicle system and the like, fully consider the environment, the battery capacity, the system requirement and the like, and improve the accuracy of the power for SOP estimation; taking the differentiation of the battery cell temperature and the SOC into consideration, an estimation mode is provided based on the maximum value and the minimum value of the battery cell temperature and the maximum value and the minimum value of the SOC, so that the safety of the battery in different states is ensured to the maximum extent, and the overcharge or the overdischarge of the battery cell is prevented.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, of the flowcharts and block diagrams in the figures that illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present invention may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (9)
1. A power bearing capacity parameter determining method, characterized in that the power bearing capacity parameter determining method comprises:
Acquiring temperature information of a power battery, a lowest battery cell state of charge (SOC) and a remaining life (SOH), wherein the temperature information comprises a highest battery cell temperature and a lowest battery cell temperature;
Determining the available power of the power battery corresponding to the current condition according to the temperature information, the lowest battery cell SOC and a preset power bearing capacity topology, wherein the power bearing capacity topology stores the corresponding relation between the highest battery cell temperature, the lowest battery cell SOC and the available power of the power battery under the condition;
determining the discharging power of the power battery in the current SOH state according to the available power and the current SOH of the power battery;
Determining the limited capacity state of the power battery, and determining the power battery to be in a limited state when the cold start flag bit or the peak power limit value flag bit of the power battery is a preset flag bit, or else, determining the power battery to be in a non-limited state;
Performing first limitation processing on the discharge power according to the limited capacity state of the power bearing capacity of the power battery;
performing second limiting treatment on the discharge power after the first limiting treatment according to the fault level of the power battery;
And determining the discharge power after the second limiting treatment as a power bearing capacity parameter of the power battery.
2. The power bearing capacity parameter determination method as claimed in claim 1, wherein the available power includes 2s discharge power, 10s discharge power and 30s discharge power; the step of determining the discharging power of the power battery in the current SOH state according to the available power and the current SOH of the power battery comprises the following steps:
Multiplying the 2s discharge power, the 10s discharge power and the 30s discharge power with the current SOH of the power battery respectively to determine the discharge power of the power battery in the current SOH state;
the discharging power of the power battery in the current SOH state comprises 2s discharging power in the current SOH state, 10s discharging power in the current SOH state and 30s discharging power in the current SOH state.
3. The power bearing capacity parameter determination method according to claim 2, the step of performing a first limitation process on the discharge power according to a limited capacity state of the power battery power bearing capacity comprising:
When the power battery is in a limited state, reducing the values of the 2s discharge power in the current SOH state and the 10s discharge power in the current SOH state to 30s discharge power in the current SOH state at a preset rate;
And when the power battery is in an unlimited state, the values of the 2s discharge power in the current SOH state, the 10s discharge power in the current SOH state and the 30s discharge power in the current SOH state are not limited.
4. The power withstand capacity parameter determining method according to claim 1, wherein the step of performing the second limiting process on the discharge power after the first limiting process according to the failure level of the power cell includes:
When the fault level is zero-level fault, the discharge power is not limited;
When the fault level is greater than zero level and less than or equal to three levels, reducing the discharge power by a preset proportion;
And when the fault level is greater than three levels, reducing the discharge power to 0.
5. A power bearing capacity parameter determining apparatus, characterized in that the power bearing capacity parameter determining apparatus includes:
The acquisition module is used for acquiring temperature information, the lowest cell temperature, the lowest cell state of charge (SOC) and the residual life (SOH) of the power battery; wherein the temperature information comprises a highest cell temperature and a lowest cell temperature;
The processing module is used for determining the available power of the power battery corresponding to the current condition according to the temperature information, the lowest battery cell SOC and a preset power bearing capacity topology, wherein the power bearing capacity topology stores the corresponding relation between the highest battery cell temperature, the lowest battery cell SOC and the available power of the power battery under the condition;
the processing module is also used for determining the discharging power of the power battery in the current SOH state according to the available power and the current SOH of the power battery;
The processing module is further used for determining the limited capacity state of the power battery, and determining that the power battery is in a limited state when the cold start flag bit or the peak power limit value flag bit of the power battery is a preset flag bit, or in a non-limited state;
The processing module is further used for performing first limiting processing on the discharge power according to the limited capacity state of the power bearing capacity of the power battery;
the processing module is also used for carrying out second limiting processing on the discharge power after the first limiting processing according to the fault level of the power battery;
and the determining module is used for determining the discharge power after the second limiting treatment as the power bearing capacity parameter of the power battery.
6. The power bearing capacity parameter determination apparatus as claimed in claim 5, wherein the available power includes 2s discharge power, 10s discharge power and 30s discharge power;
The processing module is used for multiplying the 2s discharging power, the 10s discharging power and the 30s discharging power with the current SOH of the power battery respectively to determine the discharging power of the power battery in the current SOH state; the discharging power of the power battery in the current SOH state comprises 2s discharging power in the current SOH state, 10s discharging power in the current SOH state and 30s discharging power in the current SOH state.
7. The power bearing capacity parameter determination apparatus according to claim 6, wherein the processing module is configured to reduce the values of the 2s discharge power in the current SOH state and the 10s discharge power in the current SOH state to the 30s discharge power in the current SOH state at a preset rate when the power battery is in a restricted state; and when the power battery is in an unlimited state, the values of the 2s discharge power in the current SOH state, the 10s discharge power in the current SOH state and the 30s discharge power in the current SOH state are not limited.
8. The power withstand capability parameter determining apparatus according to claim 5, wherein the processing module is configured to not limit the discharge power when the failure level is a zero-level failure; when the fault level is greater than zero level and less than or equal to three levels, reducing the discharge power by a preset proportion; and when the fault level is greater than three levels, reducing the discharge power to 0.
9. An electronic device comprising a processor and a memory, the memory storing computer readable program instructions which, when executed by the processor, implement the steps of the power capability parameter determination method of any one of claims 1 to 4.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114030357A (en) * | 2021-07-14 | 2022-02-11 | 山西赛坦科技有限公司 | Control device and control method for preventing BMS (battery management system) recharging overcurrent |
| WO2023035164A1 (en) * | 2021-09-08 | 2023-03-16 | 宁德时代新能源科技股份有限公司 | Power battery charging method and battery management system |
| CN113836714A (en) * | 2021-09-22 | 2021-12-24 | 重庆云宸新能源科技有限公司 | Multi-constraint battery available power estimation system and method based on battery state |
| CN115113077A (en) * | 2022-01-28 | 2022-09-27 | 长城汽车股份有限公司 | Method for determining available window value of battery SOC and related device |
| CN114614118B (en) * | 2022-03-09 | 2024-02-27 | 东莞新能安科技有限公司 | Battery power processing method, device and battery management system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104537268A (en) * | 2015-01-19 | 2015-04-22 | 重庆长安汽车股份有限公司 | Estimation method and device for maximum discharge power of battery |
| CN107436412A (en) * | 2017-07-31 | 2017-12-05 | 成都雅骏新能源汽车科技股份有限公司 | One kind is based on self study estimation electrokinetic cell power method |
| CN110031766A (en) * | 2019-04-28 | 2019-07-19 | 广州小鹏汽车科技有限公司 | Battery nominal power evaluation method and module, power of battery management method and system, automobile and computer readable storage medium |
| CN110133512A (en) * | 2019-03-06 | 2019-08-16 | 北京车和家信息技术有限公司 | The power of battery determines method and device thereof |
| CN110224461A (en) * | 2019-06-14 | 2019-09-10 | 桑顿新能源科技(长沙)有限公司 | Battery power limit method, apparatus, computer equipment and storage medium |
| CN110293879A (en) * | 2019-06-06 | 2019-10-01 | 浙江飞碟汽车制造有限公司 | A kind of battery system SOP dynamic adjusting method |
| CN111123124A (en) * | 2019-12-31 | 2020-05-08 | 中航锂电（洛阳）有限公司 | Method and device for determining power state of battery system |
| CN111257773A (en) * | 2019-11-05 | 2020-06-09 | 浙江零跑科技有限公司 | Battery SOP online estimation method based on pool algorithm |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9419314B2 (en) * | 2014-05-12 | 2016-08-16 | GM Global Technology Operations LLC | Systems and methods for determining battery system power capability |
-
2020
- 2020-11-30 CN CN202011383222.8A patent/CN112485685B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104537268A (en) * | 2015-01-19 | 2015-04-22 | 重庆长安汽车股份有限公司 | Estimation method and device for maximum discharge power of battery |
| CN107436412A (en) * | 2017-07-31 | 2017-12-05 | 成都雅骏新能源汽车科技股份有限公司 | One kind is based on self study estimation electrokinetic cell power method |
| CN110133512A (en) * | 2019-03-06 | 2019-08-16 | 北京车和家信息技术有限公司 | The power of battery determines method and device thereof |
| CN110031766A (en) * | 2019-04-28 | 2019-07-19 | 广州小鹏汽车科技有限公司 | Battery nominal power evaluation method and module, power of battery management method and system, automobile and computer readable storage medium |
| CN110293879A (en) * | 2019-06-06 | 2019-10-01 | 浙江飞碟汽车制造有限公司 | A kind of battery system SOP dynamic adjusting method |
| CN110224461A (en) * | 2019-06-14 | 2019-09-10 | 桑顿新能源科技(长沙)有限公司 | Battery power limit method, apparatus, computer equipment and storage medium |
| CN111257773A (en) * | 2019-11-05 | 2020-06-09 | 浙江零跑科技有限公司 | Battery SOP online estimation method based on pool algorithm |
| CN111123124A (en) * | 2019-12-31 | 2020-05-08 | 中航锂电（洛阳）有限公司 | Method and device for determining power state of battery system |
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|---|---|
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