Method for estimating the remaining load time of a power supply, battery management system and storage medium

Abstract

The present invention discloses a method for estimating the remaining load time of a power supply, a battery management system, and a storage medium. The estimation method includes: S01, obtaining the current I and single cell voltage U of the battery pack; S02, calculating the remaining load time T of the battery according to the ampere-hour integration method. Ah ; S03, calculate the remaining load time T of the battery according to the curve fitting method Line ; S04, according to the preset conditions, the remaining load time T calculated by the ampere-hour integration method Ah The remaining load time T calculated by the curve fitting method Line Perform weight calculation; S05, calculate the remaining load time T according to the calculated weight Ah and the remaining load time T Line Calculations are performed according to preset conditions to obtain the remaining load time of the battery; the method of the present invention estimates the remaining backup time, and the error between the estimated result and the actual discharge time is small. When the battery capacity is low, it can be combined with the voltage curve to achieve higher estimation accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery technology and battery energy consumption monitoring, and particularly relates to a power supply remaining load time estimation method, a storage medium and a battery management system. BACKGROUND

[0002] The estimation of the remaining load time of the power supply can provide the user with a prompt of the remaining power reserve of the battery. However, due to the factors such as the attenuation value of the battery and the environmental temperature, the estimation of the remaining load time of the power supply can be seriously deviated from the actual situation. Therefore, under the condition of multiple factors, the reference of the estimation of the remaining load time of the power supply is often unsatisfactory. At present, the remaining load time estimation scheme of the power supply mostly adopts the ampere-hour method. However, when the capacity is low, the battery can still have a load time when reaching the cut-off voltage, and the accuracy and reference of the method still have room for improvement. The main reason is that when the ampere-hour integral method is used to calculate the remaining load time of the battery, the battery is regarded as a "black box", and the temperature and attenuation of the battery are not considered. The remaining capacity and the remaining load time estimation of the battery are calculated by accumulating the energy of the battery during charging and discharging. Since the energy consumption factors such as the gasification of the battery during discharging are not considered, the charging energy is not equal to the discharging energy, which finally reduces the estimation accuracy of the remaining load time. Therefore, how to improve and increase the estimation accuracy of the remaining load time of the power supply is a very practical research topic. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a power supply remaining load time estimation method and a battery management system and a storage medium which are reliable in implementation, good in reference, and can balance the estimation of the remaining load time of the power supply corresponding to the cut-off voltage of the battery in the low capacity section while ensuring the high estimation accuracy of the battery in the high capacity section.

[0004] In order to achieve the above technical purposes, the technical scheme adopted by the present application is as follows:

[0005] A power supply remaining load time estimation method comprises the following steps:

[0006] S01, acquiring the current I and the single cell voltage U of the battery pack;

[0007] S02, calculating the remaining load time T of the battery according to the ampere-hour integral method Ah ;

[0008] S03, calculating the remaining load time T of the battery according to the curve fitting method Line ;

[0009] S04, performing weight calculation on the remaining load time T calculated by the ampere-hour integral method Ah and the remaining load time T calculated by the curve fitting method Line .

[0010] S05、according to the weight calculated remaining band load time T Ah and the remaining band load time T Line According to the preset condition calculation, the remaining band load time of the battery is obtained.

[0011] As a possible implementation, further, the scheme calculates the remaining band load time T Ah including:

[0012] Obtain the battery health degree Soh of the battery;

[0013] According to the battery health degree, the actual rated capacity of the battery is calculated, and the formula is:

[0014] Cap Real =Soh*Cap Rated

[0015] Wherein, Cap Real is the actual rated capacity of the battery, and Cap Rated is the rated capacity of the battery;

[0016] The initial capacity Cap Now of the battery is calculated by open circuit voltage method;

[0017] The battery discharge characteristic curve table is constructed, and then the battery discharge rate and the percentage value RsvCapPer of the remaining capacity are obtained according to the battery discharge characteristic curve table;

[0018] According to the battery discharge rate and the percentage value RsvCapPer of the remaining capacity and the initial capacity Cap Now , the capacity Cap Unrealse that cannot be released and the remaining available standby capacity Cap Load are calculated, and the specific formula is as follows:

[0019] Cap Unrealse =Cap Real *(1-RsvCapPer)

[0020] Cap Load =Cap Now -Cap Unrealse

[0021] According to the remaining available standby capacity Cap Load and the current I of the battery pack, the remaining band load time T Ah of the battery based on ampere hour method is calculated, and the formula is as follows:

[0022]

[0023] As a preferred selection embodiment, preferably, the battery health degree Soh of the battery is obtained by the present solution, including:

[0024] The battery health degree Soh is calculated according to the internal resistance value, and the formula is as follows:

[0025]

[0026] Wherein, Res is the current internal resistance value of the battery, Res new is the internal resistance of the battery out of the factory, Res old is the internal resistance when the battery decays to be unusable.

[0027] As a preferred selection embodiment, preferably, the initial capacity Cap Now of the battery is calculated by the open circuit voltage method in the present solution, and the formula is as follows:

[0028] Soc=(U-12)*0.742229

[0029] Cap Now =Cap Real *Soc

[0030] Wherein, U is the single cell voltage value of the battery, Cap Now is the initial capacity of the battery, and Soc is the state of charge value.

[0031] As a preferred selection embodiment, preferably, the remaining load time T Line of the battery is calculated according to the curve fitting method in the present solution, including:

[0032] The total discharge time T sum of the battery is calculated according to the discharge rate of the battery.

[0033] The curve voltage difference DeltaVolt of different ampere-hour batteries and 100AH batteries is calculated, and the formula is as follows:

[0034] DeltaVolt=I*(Res_100Ah-Res)

[0035] Wherein, I is the current of the battery group, Res_100Ah is the resistance of the 100AH battery, and Res is the resistance of the different ampere-hour battery:

[0036] The single cell voltage value of the battery at different capacity percentage intervals is calculated according to the curve voltage difference DeltaVolt and the discharge rate of the battery, wherein the single cell voltage value corresponding to the different discharge rate of the battery at the capacity percentage interval is different.

[0037] The remaining capacity percentage value Cap Per of the battery is calculated according to the single cell voltage U obtained by the current sampling of the battery.

[0038] According to the total discharge time T of the battery sum and the percentage value Cap of the remaining capacity Per The remaining load time of the battery is calculated, and the formula is as follows:

[0039] T Line = Cap Per *T sum .

[0040] As a preferred alternative embodiment, preferably, the present scheme calculates the remaining load time T Ah and the remaining load time T Line calculated by the curve fitting method under the preset conditions, and the weight value is calculated, including: obtaining the battery monomer voltage, cutoff voltage and floating voltage to calculate the remaining load time weight value, and the formula is as follows:

[0041]

[0042] According to the calculated weight value, the remaining load time T Ah and the remaining load time T Line are calculated under the preset conditions, and the formula is as follows:

[0043] T = K P *T Ah +(1-K P )*T Line

[0044] Wherein, T is the remaining load time of the battery.

[0045] As a preferred alternative embodiment, preferably, the discharge rate of the battery in the present scheme is 0.05C-3.0C, and the formula for calculating the total discharge time T sum of the battery according to the discharge rate of the battery is as follows:

[0046] When the discharge rate is 0.05-0.1C, T sum = 800-12000*DisRate;

[0047] When the discharge rate is 0.1-0.6C, T sum = 28.581*DisRate^(-1.322)+0.015;

[0048] When the discharge rate is 0.6-3.0C, T sum = 26.501*DisRate^(-1.499);

[0049] Wherein, DisRate is the discharge rate value.

[0050] As a preferred selection implementation, preferably, the scheme calculates the single battery voltage value of the battery at different capacity percentage intervals according to the curve pressure difference DeltaVolt and the battery discharge rate DisRate, including the following formulas:

[0051] Volt_Cap10%=5.816*DisRate^(-0.015)+5+DeltaVolt

[0052] Volt_Cap20%=9.703*DisRate^(-0.011)+1.357+DeltaVolt

[0053] Volt_Cap30%=6.223*DisRate^(-0.02)+4.999+DeltaVolt

[0054] Volt_Cap40%=11.84-0.407*DisRate+0.065*DisRate^2+DeltaVolt

[0055] Volt_Cap50%=12.019-0.385*DisRate+0.046*DisRate^2+DeltaVolt

[0056] Volt_Cap60%=12.175-0.423*DisRate+0.048*DisRate^2+DeltaVolt

[0057] Volt_Cap70%=12.231-0.318*DisRate+0.011*DisRate^2+DeltaVolt

[0058] Volt_Cap80%=12.278-0.251*DisRate-0.015*DisRate^2+DeltaVolt

[0059] Volt_Cap90%=12.414-0.307*DisRate-0.01*DisRate^2+DeltaVolt

[0060] Volt_Cap100%=12.617-0.469*DisRate+0.022*DisRate^2+DeltaVolt。

[0061] Based on the above, the scheme also provides a storage battery management system, which comprises:

[0062] A data sampling unit for obtaining the current I and single battery voltage U of the battery pack.

[0063] The data processing unit comprises a first processing unit and a second processing unit, the first processing unit is used for calculating the remaining load time T of the battery according to the ampere-hour integration method Ah , and the second processing unit is used for calculating the remaining load time T of the battery according to the curve fitting method Line .

[0064] The weight calculation unit is used for calculating the weights of the remaining load time T calculated by the ampere-hour integration method Ah and the remaining load time T calculated by the curve fitting method Line according to preset conditions.

[0065] The data integration unit is used for calculating the remaining load time according to the calculated weights of the remaining load time T Ah and the remaining load time T Line according to preset conditions, so as to obtain the remaining load time of the battery.

[0066] Based on the above, the present application also provides a computer storage medium, the storage medium stores at least one road monitoring information, at least one program, code set or road monitoring information set, the at least one road monitoring information, at least one program, code set or road monitoring information set is loaded and executed by the processor to realize the power supply remaining load time estimation method described above.

[0067] By adopting the technical scheme, the present application has the beneficial effects compared with the prior art: the present application provides a remaining standby power estimation method combining the ampere-hour method and the curve fitting method, which mainly combines the open circuit voltage method, the ampere-hour integration method, the curve fitting method and the weight distribution method to realize the estimation of the remaining load time; wherein, the open circuit voltage method is used to calculate the initial capacity of the static battery, the ampere-hour integration method is used to calculate the energy accumulation of the battery, the curve fitting method fits the discharge curve table according to the battery discharge characteristics, and the weight distribution mainly calculates the estimation results of the ampere-hour method and the curve fitting method in the whole discharge process, and obtains the remaining remaining load time. When the remaining standby power is estimated by the method, the estimation result has a small error with the actual discharge time, and when the battery has low capacity, the voltage curve can be combined to realize higher estimation accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0068] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0069] Figure 1 is a brief implementation flowchart of the power supply remaining load time estimation method of the present application;

[0070] Figure 2 is an implementation flowchart of the power supply remaining load time estimation method of the present application;

[0071] Figure 3 is a brief unit module connection diagram of the battery management system of the present application. DETAILED DESCRIPTION

[0072] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It is particularly pointed out that the following embodiments are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following embodiments are only part of the embodiments of the present application, but not all the embodiments, and all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0073] As shown in Figure 1 , the present embodiment scheme is a power supply remaining load time estimation method, which comprises:

[0074] S01, obtaining the current I and the single cell voltage U of the battery pack;

[0075] S02, calculating the remaining load time T of the battery according to the ampere-hour integration method Ah ;

[0076] S03, calculating the remaining load time T of the battery according to the curve fitting method Line ;

[0077] S04, performing weight calculation on the remaining load time T Ah calculated by the ampere-hour integration method and the remaining load time T Line calculated by the curve fitting method according to the preset conditions;

[0078] S05, performing calculation according to the preset conditions on the remaining load time T Ah and the remaining load time T Line according to the calculated weights, to obtain the remaining load time of the battery.

[0079] Among them, step S02, calculating the remaining load time T Ah of the battery according to the ampere-hour integration method and step S03, calculating the remaining load time T Line of the battery according to the curve fitting method are parallel processing step schemes.

[0080] On the basis of Figure 1 , in combination with Figure 2 , the present scheme calculates the remaining load time T of the battery according to the ampere-hour integration methodAh comprises:

[0081] Obtain the battery health degree Soh of the battery, and in the embodiment, the battery health degree Soh is calculated according to the internal resistance value, and the formula is as follows:

[0082]

[0083] wherein Res is the current internal resistance value of the battery, Res new is the factory internal resistance of the battery, Res old is the internal resistance when the battery decays to be unusable; generally, Res old is 2 times of Res new .

[0084] Since the battery decays after use, the actual performance of the battery is that the rated capacity of the battery decreases, therefore, the current actual rated capacity of the battery needs to be calculated according to the battery health degree, and the formula is as follows:

[0085] Cap Real =Soh*Cap Rated

[0086] wherein Cap Real is the current actual rated capacity of the battery, and Cap Rated is the rated capacity of the battery.

[0087] In order to facilitate the calculation and acquisition of the initial capacity of the battery, especially when the battery is powered on for the first time (generally, the initial capacity of the battery after long-term static state cannot be directly and accurately acquired and judged), therefore, the initial capacity Cap Now of the battery is calculated by the open circuit voltage method, and the formula for calculating the initial capacity Cap Now of the battery by the open circuit voltage method is as follows:

[0088] Soc=(U-12)*0.742229

[0089] Cap Now =Cap Real *Soc

[0090] wherein U is the single cell voltage value of the battery, Cap Now is the initial capacity of the battery, and Soc is the state of charge value.

[0091] In the calculation of the ampere-hour integration method, the current flowing into the battery represents the increase of the battery capacity, and the current flowing out of the battery represents the decrease of the battery capacity, and the formula can be expressed as follows:

[0092] Cap Now =CapNow +I*Ts

[0093] Wherein, I represents the current value flowing through the battery, Ts is the current sampling time, Cap Now on the left side of the equal sign represents the battery capacity corresponding to the current sampling time, Cap Now on the right side of the equal sign represents the battery capacity corresponding to the last sampling time of the current; in actual work, all the electric quantity that the battery can release is the remaining capacity of the battery, and the discharge rate of the battery is higher, and the remaining capacity is less.

[0094] Based on this, the battery discharge characteristic curve table is also constructed in the embodiment, and then the discharge rate of the battery and the percentage value RsvCapPer of the remaining capacity are obtained according to the battery discharge characteristic curve table, wherein the relationship between the discharge rate of the battery and the percentage value RsvCapPer of the remaining capacity in the embodiment is shown in the following table:

[0095] Discharge rate C 2.66 2.09 1.61 0.874 0.807 0.57 0.45 0.371 0.238 0.1632 0.115 0.0998 0.0527 Effective capacity percentage % 22.16667 34.83333 40.25 43.7 60.525 57 67.5 74.2 71.4 81.6 92 99.8 105.4

[0096] According to the percentage value RsvCapPer of the discharge rate of the battery and the remaining capacity and the initial capacity Cap Now of the battery, the capacity Cap Unrealse that cannot be released by the battery and the remaining available standby capacity Cap Load are calculated, and the specific formula is as follows:

[0097] Cap Unrealse = Cap Real *(1-RsvCapPer)

[0098] Cap Load = Cap Now -Cap Unrealse

[0099] According to the remaining available standby capacity Cap Load and the current I of the battery pack, the remaining load time T of the battery based on the ampere-hour method is calculated Ah , and the formula is as follows:

[0100]

[0101] The remaining load time T of the battery is calculated according to the curve fitting method in the scheme Line , and the data of the discharge rate of the battery is also needed, wherein the calculation formula of the discharge rate of the battery is as follows:

[0102]

[0103] The remaining load time T of the battery is calculated according to the curve fitting method LineThe method comprises:

[0104] According to the battery discharge rate, the total battery discharge time T is calculated sum In the embodiment, the discharge rate of the battery is 0.05C-3.0C, and the total battery discharge time T is calculated according to the battery discharge rate sum The formula is:

[0105] When the discharge rate is 0.05-0.1C, T sum =800-12000*DisRate;

[0106] When the discharge rate is 0.1-0.6C, T sum =28.581*DisRate^(-1.322)+0.015;

[0107] When the discharge rate is 0.6-3.0C, T sum =26.501*DisRate^(-1.499);

[0108] Wherein, DisRate is the discharge rate value.

[0109] On this basis, the curve voltage difference DeltaVolt of different ampere-hour batteries and 100AH batteries is calculated, and the formula is:

[0110] DeltaVolt=I*(Res_100Ah-Res)

[0111] Wherein, I is the current of the battery pack, Res_100Ah is the resistance of the 100AH battery, and Res is the resistance of the different ampere-hour batteries.

[0112] According to the curve voltage difference DeltaVolt and the battery discharge rate, the single cell voltage value of the battery at different capacity percentage intervals is calculated, wherein the single cell voltage value corresponding to the capacity percentage interval is different for different battery discharge rates, and the specific calculation formula is as follows:

[0113] Volt_Cap10%=5.816*DisRate^(-0.015)+5+DeltaVolt

[0114] Volt_Cap20%=9.703*DisRate^(-0.011)+1.357+DeltaVolt

[0115] Volt_Cap30%=6.223*DisRate^(-0.02)+4.999+DeltaVolt

[0116] Volt_Cap40% = 11.84 - 0.407*DisRate + 0.065*DisRate^2 + DeltaVolt

[0117] Volt_Cap50% = 12.019 - 0.385*DisRate + 0.046*DisRate^2 + DeltaVolt

[0118] Volt_Cap60% = 12.175 - 0.423*DisRate + 0.048*DisRate^2 + DeltaVolt

[0119] Volt_Cap70% = 12.231 - 0.318*DisRate + 0.011*DisRate^2 + DeltaVolt

[0120] Volt_Cap80% = 12.278 - 0.251*DisRate - 0.015*DisRate^2 + DeltaVolt

[0121] Volt_Cap90% = 12.414 - 0.307*DisRate - 0.01*DisRate^2 + DeltaVolt

[0122] Volt_Cap100% = 12.617 - 0.469*DisRate + 0.022*DisRate^2 + DeltaVolt.

[0123] Here, the monomer voltage value corresponds to the battery capacity, for example, Volt_Cap10% is the monomer voltage value a corresponding to the capacity of 10%, Volt_Cap20% is the monomer voltage value b corresponding to the capacity of 20%, when the sampled voltage value c is in the range [a b], then the real-time capacity is in this interval.

[0124] According to the monomer voltage U of the battery, the remaining capacity percentage value Cap of the battery is calculated Per ; wherein, Cap Per is the remaining capacity percentage value corresponding to the monomer sampling voltage U, for example:

[0125] When the monomer voltage Volt_Cap80 < U < Volt_Cap90, the remaining capacity percentage is:

[0126] Cap Per = (U - Volt_Cap80)*(90-80) / (Volt_Cap90-Volt_Cap80)

[0127] For monomer voltage calculation, taking 100AH battery as an example, when the battery is 100AH, the curve voltage difference DeltaVolt=0 is combined with the discharge curve formula, and the monomer voltage values corresponding to the capacity of 10%, 20%…100% can be obtained, and then the sampled monomer voltage value U is used to find the interval and calculate the capacity value, wherein the different ampere-hour values DeltaVolt are different.

[0128] According to the total discharge time T of the battery sum and the remaining capacity percentage value Cap Per The formula for calculating the remaining load time of the battery is as follows:

[0129] T Line =Cap Per *T sum .

[0130] The scheme calculates the weight value of the remaining load time T Ah calculated by the ampere-hour integral method and the remaining load time T Line calculated by the curve fitting method according to the preset conditions, including: obtaining the battery monomer voltage, cutoff voltage and floating voltage to calculate the remaining load time weight, and the formula is as follows:

[0131]

[0132] According to the calculated weight value, the remaining load time T Ah and the remaining load time T Line are calculated according to the preset conditions, and the formula is as follows:

[0133] T=K P *T Ah +(1-K P )*T Line

[0134] Wherein, T is the remaining load time of the battery.

[0135] In terms of weight setting, the ampere-hour integral method has high calculation accuracy when the battery has high capacity, but when the battery has low capacity, the voltage drops greatly, and the remaining time often cannot be synchronized with the cutoff voltage, resulting in low estimation accuracy. Therefore, the battery discharge curve is introduced in the low capacity section to associate the battery voltage and avoid this problem, so the calculation result of the ampere-hour integral method in the high capacity curve section is the main guide, and the curve method is the main guide in the latter half of the battery discharge section.

[0136] To facilitate example calculations, this solution uses a new 100Ah battery to carry out a UPS discharge test and monitor the battery discharge in real time. The data collected during the battery discharge process is applied to the above method to make an estimate, which is then compared with the actual discharge time. The discharge current in this test example is approximately 30A, the cutoff voltage is around 10.5V, and the actual total discharge time is 2.5h. The specific discharge data and comparison are shown in the table below:

[0137]

[0138] It can be seen from the above table that the estimation method of the present invention has better estimation accuracy regardless of whether the remaining battery capacity is high or low. Although the error of the estimation result is amplified when the remaining battery capacity is low compared to when the battery capacity is high, the error is still within a controllable range and has good reference value.

[0139] Based on the above, reference Figure 3 As shown, this solution also provides a battery management system, which includes:

[0140] A data sampling unit is used to obtain the current I and single cell voltage U of the battery pack;

[0141] The data processing unit includes a first processing unit and a second processing unit. The first processing unit is used to calculate the remaining load time T of the battery according to the ampere-hour integration method. Ah The second processing unit is used to calculate the remaining load time T of the battery according to the curve fitting method. Line ;

[0142] The weight calculation unit is used to calculate the remaining load time T calculated by the ampere-hour integration method according to the preset conditions. Ah The remaining load time T calculated by the curve fitting method Line Perform weight calculation;

[0143] The data integration unit is used to calculate the remaining load time T according to the calculated weight. Ah and the remaining load time T Line Calculate the remaining load time of the battery according to the preset conditions.

[0144] In addition, the functional units in various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0145] If the integrated unit is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the entire or part of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0146] The above only describes some embodiments of the present application, and does not limit the protection scope of the present application. Any equivalent device or equivalent process transformation, or direct or indirect application in other related technical fields based on the content of the present application specification and drawings are also included in the patent protection scope of the present application.

Claims

1. A method of estimating the remaining on-time of a power supply, characterized by, It comprises: Obtaining the current I and the cell voltage U of the battery pack; The remaining on-load time T of the battery is calculated according to the ampere-hour integration method Ah ; According to the curve fitting method to calculate the remaining battery time T Line ; T is the remaining time to be carried by the battery under the preset condition according to the ampere-hour integral method Ah T is the remaining time to be carried by the battery under the preset condition according to the curve fitting method Line weight calculation is performed; According to the weight calculated, the remaining band loading time T Ah and the remaining band loading time T Line According to the preset condition calculation, the remaining band loading time of the battery is obtained; wherein the remaining on-time T of the battery is calculated according to the ampere-hour integration method Ah comprising: Obtaining the battery health Soh of the battery; According to the battery health, the actual capacity of the battery at present is calculated, and the formula is: Cap Real = Soh * Cap Rated wherein Cap Real is the current actual capacity of the battery, Cap Rated is the battery rated capacity; The initial capacity Cap of the battery was calculated by open circuit voltage method Now The formula is: Soc=(U-12)*0.742229 Cap Now = Cap Real *Soc wherein U is a single cell voltage value of the battery, Cap Now is an initial capacity of the battery, and Soc is a state of charge value; The battery discharge characteristic curve table is constructed, and then the battery discharge rate and the percentage value RsvCapPer of the remaining capacity are obtained according to the battery discharge characteristic curve table; According to the battery discharge rate and the percentage value RsvCapPer of the remaining capacity, and the initial capacity Cap of the battery Now The calculation of the capacity Cap that the battery cannot release is performed Unrealse And the remaining available standby capacity Cap Load The specific formula is as follows: Cap Unrealse = Cap Real *(1-RsvCapPer) Cap Load =Cap Now -Cap Unrealse According to the remaining available reserve capacity Cap Load and the current I of the battery pack, the battery remaining on-time T based on the ampere-hour method is calculated Ah which is formulated as follows: According to the curve fitting method, the remaining time T of the battery under load is calculated Line comprising: According to the battery discharge rate, the total battery discharge time T is calculated sum ; The curve voltage difference DeltaVolt of different ampere-hour batteries and 100AH battery is calculated, and the formula is: DeltaVolt=I*(Res_100Ah-Res) Wherein, I is the current of the battery pack, Res_100Ah is the resistance of 100AH battery, and Res is the resistance of different ampere-hour batteries; According to the curve voltage difference DeltaVolt and the battery discharge rate, the cell voltage value of the battery at different capacity percentage intervals is calculated, wherein the different battery discharge rates correspond to different cell voltage values at the capacity percentage interval. According to the single cell voltage U obtained in the current sampling, the remaining capacity percentage value Cap of the battery is calculated Per ; According to the total battery discharge time T sum and the percentage value of the remaining capacity Cap Per The battery remaining time under load is calculated, the formula is as follows: T Line = Cap Per *T sum Tresidual calculated by the ampere-hour integration method under the preset condition Ah Tresidual calculated by the curve fitting method Line The weight value calculation includes: obtaining the battery monomer voltage, the cut-off voltage and the floating voltage to calculate the residual carrying time weight value, and the formula is as follows: The remaining band time T is calculated according to the weight Ah and the remaining band time T Line The formula for calculating according to the preset condition is: T = K P T = K Ah T = K P T = K Line Wherein, T is the remaining load time of the battery.

2. The power supply remaining on-time estimation method of claim 1, wherein, Obtaining the battery health Soh of the battery comprises: According to the internal resistance value, the battery health Soh is calculated, and the formula is as follows: Where Res is the current internal resistance value of the battery, Res new is the factory internal resistance of the battery, Res old is the internal resistance when the battery has degraded to unusable.

3. The method for estimating the remaining load time of a power supply according to claim 1, wherein: The initial capacity Cap of the battery was calculated by open circuit voltage method Now The formula is: Soc=(U-12)*0.742229 Cap Now = Cap Real *Soc where U is a single cell voltage value of the battery, Cap Now is an initial capacity of the battery, and Soc is a state of charge value.

4. The power supply remaining on-time estimation method of claim 1, wherein, The discharge rate of the battery is 0.05C-3.0C, and the total discharge time T of the battery is calculated according to the discharge rate of the battery sum The formula is: T = 800 - 12000 * DisRate when the discharge rate is 0.05-0.1C sum = 800 - 12000 * DisRate; When the discharge rate is 0.1-0.6C, T sum = 28.581 * DisRate^(-1.322) + 0.015; T = 26.501 * DisRate^(-1.499) when the discharge rate is 0.6-3.0 C sum = 26.501 * DisRate^(-1.499) when the discharge rate is 0.6-3.0 C Wherein, DisRate is the discharge rate value.

5. The method of claim 1, wherein, According to the curve voltage difference DeltaVolt and the battery discharge rate DisRate, the cell voltage value of the battery at different capacity percentage intervals comprises the following formula: Volt_Cap10%=5.816*DisRate^(-0.015)+5+DeltaVolt Volt_Cap20%=9.703*DisRate^(-0.011)+1.357+DeltaVolt Volt_Cap30%=6.223*DisRate^(-0.02)+4.999+DeltaVolt Volt_Cap40%=11.84-0.407*DisRate+0.065*DisRate^2+DeltaVolt Volt_Cap50%=12.019-0.385*DisRate+0.046*DisRate^2+DeltaVolt Volt_Cap60%=12.175-0.423*DisRate+0.048*DisRate^2+DeltaVolt Volt_Cap70%=12.231-0.318*DisRate+0.011*DisRate^2+DeltaVolt Volt_Cap80%=12.278-0.251*DisRate-0.015*DisRate^2+DeltaVolt Volt_Cap90%=12.414-0.307*DisRate-0.01*DisRate^2+DeltaVolt Volt_Cap100% = 12.617 - 0.469 * DisRate + 0.022 * DisRate^2 + DeltaVolt.

6. A battery management system which applies the power source remaining on-time estimation method according to any one of claims 1 to 5, characterized by, It includes: A data sampling unit for obtaining the current I and the cell voltage U of the battery pack; The data processing unit comprises a first processing unit and a second processing unit, the first processing unit is used for calculating the remaining load time T of the battery according to the ampere-hour integration method Ah , and the second processing unit is used for calculating the remaining load time T of the battery according to the curve fitting method Line . a weight calculation unit configured to calculate the remaining load time T according to a preset condition and the remaining load time T calculated by the curve fitting method Ah and the remaining load time T calculated by the curve fitting method Line weight calculation a data integration unit for calculating the remaining load time T Ah and the remaining load time T Line according to the calculated weight value, to obtain the remaining load time of the battery.

7. A computer storage medium, characterized in that The storage medium stores at least one piece of road monitoring information, at least one program, a code set, or a road monitoring information set, which is loaded and executed by the processor to realize the power supply remaining load time estimation method according to any one of claims 1 to 5.

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