A solid-state battery power state estimation method and system

Abstract

The present application discloses a method and system for estimating the power state of a solid-state battery, the method comprising: obtaining the temperature, state of charge SOC, and state of health SOH of the battery of a vehicle at the current moment; searching in a table for the maximum charging power and maximum discharging power corresponding to the temperature, SOC, and SOH at the current moment; obtaining the actual power of the vehicle at the current moment; obtaining the maximum charging power limit and the maximum discharging power limit of the battery in the current state according to the duration of the actual power and the maximum charging power and the maximum discharging power; correcting the maximum charging power limit and the maximum discharging power limit according to the state of the vehicle and / or the state of the battery; and outputting the corrected maximum charging power limit and the maximum discharging power limit. The present application solves the problems existing in the SOP calculation method in the prior art, thereby improving the response speed and accuracy of the SOP changes.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular, to a method and system for estimating the power state of a solid-state battery. Background Art

[0002] State of Power (SOP) is the ability of a battery to provide or feed back electrical energy within a specific time. For hybrid electric vehicles, energy management is usually performed based on the power range of the engine and battery. SOP estimation provides reasonable state information for hybrid electric vehicles. For pure electric vehicles, the peak power state can not only effectively predict the vehicle's passability in complex conditions such as climbing and descending long slopes, but also help with charging management in fast charging and regenerative braking modes, especially in the optimal allocation of recovered energy for dual-axle four-wheel drive electric vehicles. SOP has important practical value and theoretical significance in improving the dynamic performance of the vehicle and extending the life of the power battery.

[0003] The main SOP calculation methods currently used in power batteries are: (1) calibration lookup table method; (2) model-based calculation.

[0004] The calibration difference lookup table method mainly calibrates the maximum discharge power map of the battery at a specific time under different temperatures, different states of charge (SOC), and different states of health (SOH) on the test bench in the early stage. When the vehicle is driving, the current SOP of the battery is obtained by looking up the table based on the current temperature, SOC, and SOH of the battery.

[0005] The calibration difference lookup table method is currently widely used in electric vehicles. It does not rely on models and is simple to control. However, the power of the power battery changes complexly and rapidly during the driving process of the vehicle. If the temperature, SOC and SOH are looked up in the table, the battery temperature, SOC and SOH do not change significantly in a short period of time, which will cause the SOP control to be inaccurate. In order to ensure vehicle safety, this method will leave a large safety margin, which will weaken the actual charging and discharging power capacity of the battery.

[0006] The model calculation method is mainly based on the calculation of complex models such as equivalent circuit models and neural networks. This method is complex to calculate and has strong model dependence. In actual vehicle applications, due to the complexity of the system, there is strong uncertainty and interference. Currently, it is rarely used directly in vehicles. Summary of the invention

[0007] The embodiments of the present application provide a solid-state battery power state estimation method and system to at least solve the problems existing in the SOP calculation method in the prior art.

[0008] According to one aspect of the present application, a solid-state battery power state estimation method is provided, including: obtaining the temperature, charge state SOC and health state SOH of the battery of a vehicle at a current moment; searching for the maximum charging power and maximum discharging power corresponding to the temperature, SOC and SOH at the current moment in a table, wherein the correspondence between the temperature, SOC and SOH and the maximum charging power and the maximum discharging power in the table is obtained in advance through testing; obtaining the actual power of the vehicle at the current moment; obtaining the maximum charging power limit and the maximum discharging power limit of the battery in the current state according to the duration of the actual power and the maximum charging power and the maximum discharging power; correcting the maximum charging power limit and the maximum discharging power limit according to the state of the vehicle and / or the state of the battery; and outputting the corrected maximum charging power limit and the maximum discharging power limit.

[0009] Furthermore, searching in the table for the maximum charging power and the maximum discharging power corresponding to the temperature, SOC and SOH at the current moment includes: searching in the table for the maximum charging powers Pc1, Pc2 and Pc3 corresponding to the temperature, SOC and SOH at the current moment, wherein Pc1 and Pc2 are the maximum charging powers of the battery durations t1 and t2, respectively, and Pc3 is the continuous maximum charging power; searching in the table for the maximum discharging powers Pd1, Pd2 and Pd3 corresponding to the temperature, SOC and SOH at the current moment, wherein Pd1 and Pd2 are the maximum discharging powers of the battery durations t1 and t2, respectively, and Pd3 is the continuous maximum discharging power, t1<t2, Pc1>Pc2>Pc3, Pd1>Pd2>Pc3.

[0010] Furthermore, obtaining the maximum charging power limit and the maximum discharging power limit of the battery in the current state according to the duration of the actual power and the maximum charging power and the maximum discharging power includes: outputting the maximum charging power limit Pclim in Pc1, Pc2 and Pc3 according to the duration of the actual power P; outputting the maximum discharging power limit Pdlim in Pd1, Pd2 and Pd3 according to the duration of the actual power P.

[0011] Furthermore, outputting the maximum charging power limit Pclim in Pc1, Pc2 and Pc3 according to the duration of the actual power P includes: assuming that Pclim=Pc1 in the initial stage; when P≥the first threshold value*Pc1 and the duration exceeds t1, Pclim is reduced to Pc2; when the actual charging power P of the vehicle≥the first threshold value*Pc2 and the duration exceeds t2, Pclim is reduced to Pc3; when the current vehicle Pclim=Pc3, when the actual charging power P of the vehicle is less than Pc3 and the duration exceeds 3s, Pclim is restored to Pc1; when the current vehicle Pclim=Pc2, when the actual charging power of the vehicle is less than the first threshold value*Pc2 and the duration exceeds 3s, Pclim is restored to Pc1; the first threshold is greater than 0 and less than 1.

[0012] Furthermore, outputting the maximum charging power limit Pclim in Pc1, Pc2 and Pc3 according to the duration of the actual power P includes: assuming that Pdlim=Pd1 in the initial stage; when P≥the second threshold*Pd1 and the duration exceeds t1, Pdlim is reduced to Pc2; when the actual discharge power of the vehicle P≥the second threshold*Pd2 and the duration exceeds t2, Plim is reduced to Pd3; when the actual discharge power of the vehicle P<Pd3 and the duration exceeds 3s, Plim is restored to Pd1; the second threshold is greater than 0 and less than 1, and the second threshold is less than the first threshold.

[0013] Furthermore, correcting the maximum charging power limit and the maximum discharging power limit according to the state of the vehicle and / or the state of the battery includes: correcting the maximum discharge power limit Pdlim and the maximum charging power limit Pclim to obtain corrected power limits Pdlim1 and Pclim1, wherein Pdlim1=k1*Pdlim, Pclim1=k2*Pdlim, wherein correction coefficients k1 and k2 are obtained after pre-testing based on the charging and discharging characteristics of the battery and the safety redundancy.

[0014] Furthermore, the maximum charging power limit and the maximum discharging power limit are corrected according to the state of the vehicle and / or the state of the battery, including: the faults occurring during the use of the vehicle are divided into n levels, and when in different fault levels, the power needs to be reduced to a specified power limit Ps within different limited time ts, where ts and Ps are pre-tested according to different fault levels; Pdlim1 and Pclim1 are corrected according to the following formula: Pdlim2=Pdlim1-(Pdlim1-Ps) / ts, Pclim2=Pclim1-(Pclim1-Ps) / ts; wherein Pdlim2 is the corrected maximum discharge power limit and Pclim2 is the corrected maximum charging power limit.

[0015] According to another aspect of the present application, a solid-state battery power state estimation system is also provided, including: a first acquisition module, used to obtain the temperature, charge state SOC and health state SOH of the vehicle's battery at the current moment; a search module, used to search the maximum charging power and maximum discharging power corresponding to the temperature, SOC and SOH at the current moment in a table, wherein the correspondence between the temperature, SOC and SOH and the maximum charging power and the maximum discharging power in the table is obtained in advance through testing; a second acquisition module, used to obtain the actual power of the vehicle at the current moment; a third acquisition module, used to obtain the maximum charging power limit and the maximum discharging power limit of the battery in the current state according to the duration of the actual power and the maximum charging power and the maximum discharging power; a correction module, used to correct the maximum charging power limit and the maximum discharging power limit according to the state of the vehicle and / or the state of the battery; an output module, used to output the corrected maximum charging power limit and the maximum discharging power limit.

[0016] According to another aspect of the present application, a memory is provided for storing software, wherein the software is used to execute the above method.

[0017] According to another aspect of the present application, a processor is also provided for running software, wherein the software is used to execute the above method.

[0018] In the embodiment of the present application, the temperature, state of charge SOC and health state SOH of the vehicle's battery at the current moment are obtained; the maximum charging power and maximum discharging power corresponding to the temperature, SOC and SOH at the current moment are searched in a table, wherein the correspondence between the temperature, SOC and SOH in the table and the maximum charging power and the maximum discharging power is obtained in advance through testing; the actual power of the vehicle at the current moment is obtained; the maximum charging power limit and the maximum discharging power limit of the battery in the current state are obtained according to the duration of the actual power and the maximum charging power and the maximum discharging power; the maximum charging power limit and the maximum discharging power limit are corrected according to the state of the vehicle and / or the state of the battery; and the corrected maximum charging power limit and the maximum discharging power limit are output. The present application solves the problems existing in the SOP calculation method in the prior art, thereby improving the response speed and accuracy of the SOP changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 is a flow chart of a method for estimating a power state of a solid-state battery according to an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of an output charging power limit according to an embodiment of the present application;

[0022] Figure 3 is a flow chart of a battery power state estimation method according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0025] In this embodiment, a solid-state battery power state estimation method is provided. Figure 3 is a flow chart of a battery power state estimation method according to an embodiment of the present application. Figure 3 As shown, the process includes the following steps:

[0026] Step S302, obtaining the current temperature, state of charge SOC and state of health SOH of the battery of the vehicle;

[0027] Step S304, searching a table for the maximum charging power and the maximum discharging power corresponding to the temperature, SOC and SOH at the current moment, wherein the corresponding relationship between the temperature, SOC and SOH and the maximum charging power and the maximum discharging power in the table is obtained in advance through testing;

[0028] Step S306, obtaining the actual power of the vehicle at the current moment;

[0029] Step S308, obtaining a maximum charging power limit and a maximum discharging power limit of the battery in a current state according to the duration of the actual power and the maximum charging power and the maximum discharging power;

[0030] Step S310, modifying the maximum charging power limit and the maximum discharging power limit according to the state of the vehicle and / or the state of the battery;

[0031] Step S312: outputting the corrected maximum charging power limit and the maximum discharging power limit.

[0032] The above steps solve the problems existing in the SOP calculation method in the prior art, thereby improving the change response speed and accuracy of the SOP.

[0033] In the above steps, in order to better process, the maximum charging power and the maximum discharging power can be obtained according to the duration, that is, in an optional manner, searching the table for the maximum charging power and the maximum discharging power corresponding to the temperature, SOC and SOH at the current moment, including: searching the table for the maximum charging powers Pc1, Pc2 and Pc3 corresponding to the temperature, SOC and SOH at the current moment, wherein Pc1 and Pc2 are the maximum charging powers of the battery durations t1 and t2, respectively, and Pc3 is the continuous maximum charging power; searching the table for the maximum discharging powers Pd1, Pd2 and Pd3 corresponding to the temperature, SOC and SOH at the current moment, wherein Pd1 and Pd2 are the maximum discharging powers of the battery durations t1 and t2, respectively, and Pd3 is the continuous maximum discharging power, t1<t2, Pc1>Pc2>Pc3, Pd1>Pd2>Pc3.

[0034] In the above optional manner, the maximum charging power limit Pclim can be output in Pc1, Pc2 and Pc3 according to the duration of the actual power P; the maximum discharging power limit Pdlim can be output in Pd1, Pd2 and Pd3 according to the duration of the actual power P.

[0035] For example, outputting the maximum charging power limit Pclim in Pc1, Pc2 and Pc3 according to the duration of the actual power P includes: assuming that Pclim=Pc1 in the initial stage; when P≥the first threshold value*Pc1 and the duration exceeds t1, Pclim is reduced to Pc2; when the actual charging power P of the vehicle≥the first threshold value*Pc2 and the duration exceeds t2, Pclim is reduced to Pc3; when the current vehicle Pclim=Pc3, when the actual charging power P of the vehicle is less than Pc3 and the duration exceeds 3s, Pclim is restored to Pc1; when the current vehicle Pclim=Pc2, when the actual charging power of the vehicle is less than the first threshold value*Pc2 and the duration exceeds 3s, Pclim is restored to Pc1; the first threshold is greater than 0 and less than 1.

[0036] For another example, outputting the maximum charging power limit Pclim in Pc1, Pc2 and Pc3 according to the duration of the actual power P includes: assuming that Pdlim=Pd1 in the initial stage; when P≥the second threshold*Pd1 and the duration exceeds t1, Pdlim is reduced to Pc2; when the actual discharge power of the vehicle P≥the second threshold*Pd2 and the duration exceeds t2, Plim is reduced to Pd3; when the actual discharge power of the vehicle P<Pd3 and the duration exceeds 3s, Plim is restored to Pd1; the second threshold is greater than 0 and less than 1, and the second threshold is less than the first threshold.

[0037] There are many ways to modify the maximum charging power limit and the maximum discharging power limit.

[0038] For example, the maximum discharge power limit Pdlim and the maximum charging power limit Pclim are corrected to obtain corrected power limits Pdlim1 and Pclim1, wherein Pdlim1=k1*Pdlim, Pclim1=k2*Pdlim, wherein correction coefficients k1 and k2 are obtained after pre-testing based on the charge and discharge characteristics of the battery and the safety redundancy.

[0039] In another optional example, the vehicle can be divided into n levels according to the faults occurring during the use of the vehicle. When in different fault levels, the power needs to be reduced to the specified power limit Ps within different limited time ts, where ts and Ps are pre-tested according to the conditions of different fault levels; Pdlim1 and Pclim1 are corrected according to the following formulas: Pdlim2=Pdlim1-(Pdlim1-Ps) / ts, Pclim2=Pclim1-(Pclim1-Ps) / ts; wherein Pdlim2 is the corrected maximum discharge power limit and Pclim2 is the corrected maximum charging power limit.

[0040] An optional embodiment is described below in conjunction with the accompanying drawings. This optional embodiment is based on calibration interpolation and adopts an adaptive adjustment control strategy. This embodiment proposes a SOP estimation method that can be applied to the power state (SOP) estimation method of solid-state batteries for pure electric and hybrid vehicles, aiming at the charging and discharging characteristics of solid-state batteries. It can realize dynamic correction of the battery power state, improve the control accuracy of SOP, improve the effective use power of the battery and extend the battery life. Figure 1 is a flow chart of a method for estimating the power state of a solid-state battery according to an embodiment of the present application, such as Figure 1 As shown, firstly, the power MAP is calibrated, then the temperature is collected, the SOC is calculated, and the SOH is calculated; the maximum allowable power values ​​(Pc1, Pc2, Pc3, Pd1, Pd2, Pd3) under different continuous charge and discharge times are obtained by looking up the table; the maximum power limit (Pclim, Pdlim) of the battery state on the day is calculated according to the duration of the actual power; then the power limit of the battery is corrected according to the temperature and the single cell voltage; then the correction is made according to the current vehicle fault level; finally, Pclim2 and Pdlim2 are output as the current maximum charge / discharge power limit of the power battery. In this embodiment, by comparing the current power of the vehicle with the calibrated power in real time, the power limit of the battery output is corrected in real time, so that the rapid response adjustment of the SOP is realized, which greatly improves the change response speed and accuracy of the SOP.

[0041] Below Figure 1 Describe the steps involved.

[0042] 1. Power Map Calibration Phase

[0043] (1.1) Power Map calibration. Determine the maximum charge / discharge power of the battery at different temperatures, different SOCs, and different SOHs. The temperature range is -35 to 55°C, with an interval of 5°C. SOC ranges from 0 to 100%, with an interval of 5%. SOH ranges from 100% to 80%, with an interval of 10%. Determine the maximum charging power Pc1, Pc2 and the continuous maximum charging power Pc3 of the power battery for durations of t1 and t2 seconds. Determine the maximum discharge power Pd1, Pd2 and the continuous maximum discharge power Pd3. Assuming t1<t2, usually Pc1>Pc2>Pc3, Pd1>Pd2>Pc3;

[0044] The t1 and t2 values ​​selected for the above calibration are determined in combination with the actual application scenarios of the vehicle. Preferably, more time periods can be divided according to the specific application scenarios, which can improve the control accuracy of the SOP. The specific discharge scenarios are shown in Table 1 below. The values ​​of t1 and t2 in the charging state are small, which can increase the charging rate of the battery, but t1 and t2 are large, which is not conducive to the life of the battery cell, so it is necessary to confirm with the battery cell manufacturer based on the battery cell characteristics.

[0045] Table 1

[0046]

[0047] 2. Table Lookup Stage

[0048] (2.1) In order to reduce the error caused by sudden changes in temperature sampling, the average temperature T within the most recent 10 sampling periods is taken as the current temperature.

[0049]

[0050] (2.2) According to the current temperature Tr, SOC and SOH are linearly looked up in the calibrated power Map to obtain the battery's current state lasting t1, t2 seconds and the maximum continuous charge / discharge power Pc1, Pc2, Pc3 and the maximum discharge power Pd1, Pd2, Pd3.

[0051] (2.3) The method for performing linear table lookup in (2.2) above is as follows: Let the current highest single cell temperature be Tmax, the lowest single cell temperature be Tmin, and let T = [Tmax, Tmin]. Let the highest single cell SOC be SOCmax, and the lowest single cell SOC be SOCmin, and let SOC = [SOCmax, SOCmin]. Let the highest single cell SOH be SOHmax, and the lowest single cell SOH be SOHmin, and let SOH = [SOHmax, SOHmin]. The maximum and minimum values ​​of temperature T, SOC and SOH are arranged and combined into 8 groups of input parameters for table lookup, namely, [Tmax, SOCmax, SOHmax], [Tmax, SOCmax, SOHmin], [Tmax, SOCmin, SOHmax], [Tmin, SOCmax, SOHmax], [Tmax, SOCmin, SOHmin], [Tmin, SOCmax, SOHmin], [Tmin, SOCmax, SOHmin], [Tmin, SOCmin, SOHmax], [Tmin, SOCmin, SOHmin], [Tmin, SOCmin, SOHmax], [Tmin, SOCmin, SOHmin], and 8 groups of corresponding power limit values ​​[Pc1, Pc2, Pc3, Pd1, Pd2, Pd3] are obtained by query, and the minimum value of each limit value in each group is taken as the corresponding power limit value.

[0052] 3. Calculation phase

[0053] The calculation stage uses a method of comparing actual working conditions with calibration limits to achieve SOP correction. Since the SOP of the power battery changes in real time with the operating status of the battery, it is closely related to the battery's temperature, SOC, SOH and current discharge power. The commonly used SOP algorithm mainly calibrates the SOP MAP by temperature and SOC in the early stage, and then determines the SOP by table lookup. The actual charge and discharge power status of the current vehicle is not taken into account. The feature of this solution is that the current charge and discharge power of the battery is compared with the calibration value, and the battery SOP value can be automatically adjusted according to the actual charge and discharge power duration.

[0054] (3.1) According to the current current I and terminal voltage U of the power battery, calculate the current actual power of the vehicle P = I*U;

[0055] (3.2) When the battery is in the charging state, determine the relationship between the current actual charging power P and the current maximum charging power limits Pc1, Pc2 and Pc3, and output the charging power limit Pclim currently applied to the battery.

[0056] Figure 2 is a schematic diagram of the output charging power limit according to an embodiment of the present application, such as Figure 2 As shown, ① assume that Pclim=Pc1 in the initial stage. When P≥0.95*Pc1 and the duration exceeds t1, Pclim drops to Pc2, that is, the current charging power limit of the vehicle is Plim=Pc2. ② When the actual charging power of the vehicle P≥0.95*Pc2 and the duration exceeds t2, Pclim drops to Pc3. ③ When the current vehicle Pclim=Pc3, when the actual charging power of the vehicle P<Pc3 and the duration exceeds 3s, Pclim returns to Pc1. When the current vehicle Pclim=Pc2, when the actual charging power of the vehicle is<0.95*Pc2 and the duration exceeds 3s, Pclim returns to Pc1.

[0057] (3.3) When the battery is in the discharging state, the applied discharge power limit Pdlim is the same as that in the charging state. That is:

[0058] ① Assume that Pdlim=Pd1 in the initial stage. When P≥0.9*Pd1 and the duration exceeds t1, Pdlim drops to Pc2, that is, the discharge power limit currently applied by the vehicle is Pdlim=Pc2.

[0059] ② When the actual discharge power of the vehicle P≥0.9*Pd2 and the duration exceeds t2, Plim drops to Pd3.

[0060] ③ When the actual discharge power of the vehicle P is less than Pd3 and the duration exceeds 3s, Plim returns to Pd1.

[0061] (3) As described in (3.1) and (3.2), when Pdlim and Pclim need to be reduced, they should not be reduced from the current value to the target value instantly, but should be reduced to the target value at a constant rate (k) within a certain time tr. When reducing from Pd1 to Pd2, k = (Pd1-Pd2) / tr, and when reducing from Pd2 to Pd3, k = (Pd2-Pd3) / tr. The time tr is determined by the vehicle dynamic safety. When Pdlim and Pclim need to be increased, they can be directly increased from the current limit value to the target limit value without a certain time.

[0062] (4) The actual power P of the vehicle described in (3) above is the power value of the vehicle at each moment. The power at a certain moment is P(t). The power limits at each duration, Pc1, Pc2, Pc3, Pd1, Pd2 and Pd3, also change according to the battery status at a certain moment. The values ​​at time t are recorded as Pc1(t), Pc2(t), Pc3(t), Pd1(t), Pd2(t) and Pd3(t). The comparison between the actual power and the power limits described in (3) above is the comparison between the power at each moment and the power limit at each moment, i.e., P(t) is compared with Pc1(t), P(t+△t) is compared with Pc1(t+△t), and △t is the time step, which is determined according to the sampling period.

[0063] 4. Correction phase

[0064] (4.1) The power limit of the battery is corrected according to the lowest cell temperature and the lowest cell voltage in the power battery. The correction method is as follows: when the battery is at the lowest cell temperature T1, when the lowest cell voltage is V1, the lowest limit voltage Vmin of the low voltage at temperature T, the Pdlim or Pclim output in the above 3 is corrected to obtain the corrected power limit Pdlim1 and Pclim1, Pdlim1 = k1*Pdlim, Pclim1 = k2*Pdlim, where the correction coefficients k1 and k2 are determined according to the charge and discharge characteristics of the battery and the safety margin. When no correction is performed, k1 = k2 = 1.

[0065] (4.2) Correction is made according to the current vehicle fault level. The faults that occur during vehicle use are divided into n levels. When in different fault levels, the power needs to be reduced to the specified power limit Ps within a limited time ts. ts and Ps are determined according to the conditions of different fault levels. Therefore, the power limit output during the process is Pdlim2 = Pdlim1-(Pdlim1-Ps) / ts, Pclim2 = Pclim1-(Pclim1-Ps) / ts.

[0066] 5. Output stage

[0067] The maximum power charge / discharge rate limits under the current state of the final power battery output are Pclim2 and Pdlim2.

[0068] The above embodiments have the following effects: (1) It has strong real-time performance, does not rely on complex models, and does not increase the calculation burden of the power battery BMS. Because the scheme in the above embodiments still obtains the basic limit value by looking up the table in the early stage, and the calculation is mainly adjusted by dynamically comparing the actual value with the basic value, the model complexity is not high. (2) The above embodiments can solve the shortcomings of the traditional temperature, SOC and SOH table lookup to obtain the SOP method, which has slow dynamic response and large redundancy, through the third step calculation stage. Because the above embodiments compare the actual power with the preset power of several stages in real time, the control is real-time.

[0069] In this embodiment, an electronic device is provided, including a memory and a processor. The memory stores a computer program, and the processor is configured to run the computer program to execute the method in the above embodiment.

[0070] The above program can be run in the processor, or it can be stored in the memory (or computer-readable medium), which includes permanent and non-permanent, removable and non-removable media. Information storage can be achieved by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined in this article, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0071] These computer programs can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps of the functions specified in one or more blocks can be implemented by different modules corresponding to different steps.

[0072] Such a device or system is provided in this embodiment. The system is called a solid-state battery power state estimation system, and includes: a first acquisition module, used to obtain the temperature, charge state SOC and health state SOH of the battery of the vehicle at the current moment; a search module, used to find the maximum charging power and maximum discharging power corresponding to the temperature, SOC and SOH at the current moment in the table, wherein the correspondence between the temperature, SOC and SOH in the table and the maximum charging power and the maximum discharging power is obtained in advance through testing; a second acquisition module, used to obtain the actual power of the vehicle at the current moment; a third acquisition module, used to obtain the maximum charging power limit and the maximum discharging power limit of the battery in the current state according to the duration of the actual power and the maximum charging power and the maximum discharging power; a correction module, used to correct the maximum charging power limit and the maximum discharging power limit according to the state of the vehicle and / or the state of the battery; an output module, used to output the corrected maximum charging power limit and the maximum discharging power limit.

[0073] The system or device is used to implement the functions of the method in the above-mentioned embodiment. Each module in the system or device corresponds to each step in the method, which has been explained in the method and will not be repeated here.

[0074] The above embodiments solve the problems existing in the SOP calculation method in the prior art, thereby improving the change response speed and accuracy of the SOP.

[0075] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for estimating a solid-state battery power state, characterized in that: include: Get the current temperature, state of charge SOC and state of health SOH of the vehicle's battery; Searching the maximum charging power and the maximum discharging power corresponding to the temperature, SOC and SOH at the current moment in a table, wherein the corresponding relationship between the temperature, SOC and SOH and the maximum charging power and the maximum discharging power in the table is obtained in advance through testing; Obtaining the actual power of the vehicle at the current moment; acquiring a maximum charging power limit and a maximum discharging power limit of the battery in a current state according to the duration of the actual power and the maximum charging power and the maximum discharging power; Modifying the maximum charging power limit and the maximum discharging power limit according to the state of the vehicle and / or the state of the battery; Output the corrected maximum charging power limit and maximum discharging power limit.

2. The method according to claim 1, characterized in that: Finding the maximum charging power and the maximum discharging power corresponding to the temperature, SOC and SOH at the current moment in the table includes: Find the maximum charging powers Pc1, Pc2 and Pc3 corresponding to the temperature, SOC and SOH at the current moment in the table, wherein Pc1 and Pc2 are the maximum charging powers of the durations t1 and t2 of the actual power, respectively, and Pc3 is the continuous maximum charging power; The maximum discharge powers Pd1, Pd2 and Pd3 corresponding to the temperature, SOC and SOH at the current moment are searched in the table, wherein Pd1 and Pd2 are the maximum discharge powers of the durations t1 and t2 of the actual power respectively, and Pd3 is the continuous maximum discharge power, t1<t2, Pc1>Pc2>Pc3, Pd1>Pd2>Pc3.

3. The method according to claim 2, characterized in that Acquiring the maximum charging power limit and the maximum discharging power limit of the battery in the current state according to the duration of the actual power and the maximum charging power and the maximum discharging power includes: Outputting the maximum charging power limit value Pclim in Pc1, Pc2 and Pc3 according to the duration of the actual power P; The maximum discharge power limit value Pdlim is output in Pd1, Pd2 and Pd3 according to the duration of the actual power P.

4. The method according to claim 3, characterized in that Outputting the maximum charging power limit value Pclim in Pc1, Pc2 and Pc3 according to the duration of the actual power P includes: Assume that Pclim=Pc1 in the initial stage; when P≥the first threshold value*Pc1 and the duration exceeds t1, Pclim drops to Pc2; when the actual charging power of the vehicle P≥the first threshold value*Pc2 and the duration exceeds t2, Pclim drops to Pc3; when the current vehicle Pclim=Pc3, when the actual charging power of the vehicle P<Pc3 and the duration exceeds 3s, Pclim returns to Pc1; when the current vehicle Pclim=Pc2, when the actual charging power of the vehicle is<the first threshold value*Pc2 and the duration exceeds 3s, Pclim returns to Pc1; the first threshold is greater than 0 and less than 1.

5. The method according to claim 4, characterized in that Outputting the maximum charging power limit value Pclim in Pc1, Pc2 and Pc3 according to the duration of the actual power P includes: Assume that Pdlim=Pd1 in the initial stage; when P≥the second threshold*Pd1 and the duration exceeds t1, Pdlim drops to Pc2; when the actual discharge power of the vehicle P≥the second threshold*Pd2 and the duration exceeds t2, Plim drops to Pd3; when the actual discharge power of the vehicle P<Pd3 and the duration exceeds 3s, Plim returns to Pd1; the second threshold is greater than 0 and less than 1, and the second threshold is less than the first threshold.

6. The method according to any one of claims 1 to 5, characterized in that Modifying the maximum charging power limit and the maximum discharging power limit according to the state of the vehicle and / or the state of the battery includes: The maximum discharge power limit Pdlim and the maximum charging power limit Pclim are corrected to obtain corrected power limits Pdlim1 and Pclim1, wherein Pdlim1=k1*Pdlim, Pclim1=k2*Pdlim, wherein correction coefficients k1 and k2 are obtained after pre-testing based on the charge and discharge characteristics of the battery and the safety margin.

7. The method according to claim 6, characterized in that Modifying the maximum charging power limit and the maximum discharging power limit according to the state of the vehicle and / or the state of the battery includes: According to the faults occurring during the use of the vehicle, the faults are divided into n levels. When the faults are at different levels, the power needs to be reduced to a specified power limit value Ps within different limited time ts. ts and Ps are obtained by pre-testing according to the conditions of different fault levels. Pdlim1 and Pclim1 are corrected according to the following formula: Pdlim2=Pdlim1-(Pdlim1-Ps) / ts, Pclim2=Pclim1-(Pclim1-Ps) / ts; where Pdlim2 is the corrected maximum discharge power limit and Pclim2 is the corrected maximum charging power limit.

8. A solid-state battery power state estimation system, characterized in that: include: The first acquisition module is used to obtain the current temperature, charge state SOC and health state SOH of the battery of the vehicle; A search module, used to search in a table for the maximum charging power and the maximum discharging power corresponding to the temperature, SOC and SOH at the current moment, wherein the corresponding relationship between the temperature, SOC and SOH and the maximum charging power and the maximum discharging power in the table is obtained in advance through testing; A second acquisition module is used to acquire the actual power of the vehicle at the current moment; a third acquisition module, configured to acquire a maximum charging power limit and a maximum discharging power limit of the battery in a current state according to the duration of the actual power and the maximum charging power and the maximum discharging power; a correction module, configured to correct the maximum charging power limit and the maximum discharging power limit according to the state of the vehicle and / or the state of the battery; The output module is used to output the corrected maximum charging power limit and the maximum discharging power limit.

9. A memory for storing software, characterized in that: The software is used to execute the method according to any one of claims 1 to 7.

10. A processor for running software, characterized in that: The software is used to execute the method according to any one of claims 1 to 7.

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