CN112706652A - Electric vehicle V2G mode discharge capacity determination method and device and storage device - Google Patents
Electric vehicle V2G mode discharge capacity determination method and device and storage device Download PDFInfo
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Abstract
The invention relates to the technical field of electric vehicle charging and discharging control, in particular to a method and a device for determining the discharging amount of an electric vehicle in a V2G mode and a storage device. The invention discloses a method for determining the discharge capacity of an electric vehicle V2G in a V2G mode, which mainly comprises the following steps: setting a discharge cutoff capacity value SOC _ V2G in a V2G state within a predetermined range of the discharge capacity in a V2G state; a calculation step: calculating a capacity retention rate Q _ fdb in a life simulation cycle based on the set discharge cutoff capacity value SOC _ V2G; a judging step: judging whether the capacity retention rate Q _ fdb is within the range of the target value of the battery capacity retention rate; if so, determining that the discharge cutoff capacity value is SOC _ V2G; otherwise, adjusting the discharge cutoff capacity value SOC _ V2G in a PID adjusting mode, and re-executing the steps from the first step to the third step. By adopting the scheme, the discharge cut-off SOC under the working condition of V2G is regulated in a PID mode, the service life simulation time is saved, and the result error of the capacity retention rate is controlled in the minimum range so as to provide the maximum discharge capacity as far as possible.
Description
Technical Field
The invention relates to the technical field of electric vehicle charging and discharging control, in particular to a method and a device for determining the discharging amount of an electric vehicle in a V2G mode, and also relates to a storage device.
Background
With the popularization of new energy electric vehicles, consumers pay more and more attention to the performance of the battery core, particularly the function of the electric vehicle, the service life of the battery and the charging time, which are directly related to the purchasing intention of the consumers. During battery design, research and development personnel need to perform battery life simulation according to the working conditions of users, so that the quality guarantee time and the mileage of the battery are obtained. The functions of the electric Vehicle are more complicated nowadays, and the problem is that after a V2G (V2G is an abbreviation of Vehicle-to-grid) is added, which describes the relationship between the electric Vehicle and a power grid, namely that when the electric Vehicle is not used, the electric energy of an on-board battery is sold to the system of the power grid, and if the on-board battery needs to be charged, the current flows from the power grid to the Vehicle), the working conditions of different discharging depths need to be subjected to service life evaluation, so that the electric Vehicle of a user can supply the most electric energy to the power grid within the allowable range of quality guarantee time and mileage, and how to quickly and accurately find out the appropriate V2G discharging cut-off SOC (abbreviation, namely the State of Charge, which is used for reflecting the residual capacity of the battery) becomes a problem.
In the prior art, related power battery operation life prediction technologies are involved, but most of the technologies consider the capacity loss of a battery under a fixed working condition and are calculated based on life data of the battery under a certain test condition and a related battery attenuation mechanism, but under the condition of a non-fixed working condition, the capacity attenuation of the battery needs to be simulated for many times, so that an ideal result is obtained, and time is wasted.
Disclosure of Invention
In view of the above, the present invention is directed to a method for determining a discharge capacity of an electric vehicle V2G in a V2G mode, so as to quickly adjust a discharge cut-off SOC under a V2G condition, and provide the largest discharge capacity as possible while meeting a warranty life.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for determining the discharge capacity of an electric vehicle V2G in a V2G mode comprises the following steps:
step one, setting step: setting a discharge cutoff capacity value SOC _ V2G in a V2G state within a predetermined range of the discharge capacity in a V2G state;
step two, calculating step: calculating a capacity retention rate Q _ fdb in a life simulation cycle based on the set discharge cutoff capacity value SOC _ V2G;
step three, judging step: judging whether the capacity retention rate Q _ fdb is within the range of the target value of the battery capacity retention rate; if so, determining that the discharge cutoff capacity value is SOC _ V2G; otherwise, adjusting the discharge cutoff capacity value SOC _ V2G in a PID adjusting mode, and re-executing the steps from the first step to the third step.
Further, in the step one, a capacity retention rate allowable error Δ Qmax is set; in the third step, the absolute value delta Q of the difference between the capacity retention rate Q _ fdb obtained in the second step and the target value Q _ ref of the battery capacity retention rate in the target age is compared with the capacity retention rate allowable error delta Qmax to judge whether the capacity retention rate Q _ fdb is in the range of the target value of the battery capacity retention rate.
Further, the target value Q _ ref of the battery capacity retention ratio for the target age is obtained by calculating a capacity decrement per unit time of the battery life simulation.
Furthermore, the capacity attenuation value of the battery life simulation unit time is the sum of the cycle life attenuation value and the calendar life attenuation value.
Further, the cycle life attenuation value is calculated by the following formula:
wherein Ca is the cumulative amount of real-time capacity usage; f1 is a battery capacity cycle life decay acceleration factor function; ct1 is the temperature-influencing factor for the decay under cell cycling conditions; csoc1 is an SOC influencing factor; ci1 is the current influencing factor.
Further, the calendar life decay value is calculated by the following formula:
wherein Tr is storage time under the parking condition; f2 is a battery capacity calendar life decay acceleration factor function; ct2 is the temperature influencing factor; csoc2 is the SOC influencing factor.
Further, in the step one, a discharge cut-off capacity value SOC _ V2G in a V2G state is set according to parameters of life simulation of the power battery in service life.
Further, the parameters comprise cycle conditions, simulation cycle times and use conditions of life simulation of the power battery within the service life.
The invention also provides a device for determining the discharge capacity of the electric vehicle in the V2G mode, which comprises:
a setting module that sets a discharge cutoff capacity value SOC _ V2G in a V2G state within a predetermined range of a discharge capacity in a V2G state;
the calculation module is used for calculating a capacity retention rate Q _ fdb in a life simulation cycle based on the set discharge cutoff capacity value SOC _ V2G;
and the judging module is used for judging whether the capacity retention rate Q _ fdb is within the range of the target value of the battery capacity retention rate.
Further, the present invention provides a storage device storing an execution program executed in the steps of the electric vehicle V2G mode discharge amount determining method as described above.
Compared with the prior art, the invention has the following advantages:
according to the method and the device for determining the discharge capacity of the electric vehicle in the V2G mode, the discharge cut-off SOC under the working condition of V2G is adjusted in a PID mode, so that the service life simulation time is saved, the simulation complexity is simplified, and meanwhile, the result error of the capacity retention rate is controlled in the minimum range so as to provide the maximum discharge capacity as far as possible.
The storage device according to the present invention has corresponding effects to the method and the device for determining the discharge amount of the electric vehicle V2G in the mode, which are not described herein again.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention, and the description is given by way of example only and without limitation to the terms of relative positions. In the drawings:
FIG. 1 is a flowchart of a method for determining the discharge capacity of an electric vehicle V2G in accordance with an embodiment of the present invention;
FIG. 2 is a comparison graph of simulated cycle capacity retention and target battery capacity retention for battery life according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of an electric vehicle V2G mode discharge amount determination apparatus according to a second embodiment of the present invention;
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
As shown in fig. 1, the method for determining the discharge capacity of the electric vehicle V2G in the mode according to the present embodiment mainly includes the following steps:
step one, setting step: setting a discharge cutoff capacity value SOC _ V2G in a V2G state within a predetermined range of the discharge capacity in a V2G state;
step two, calculating step: calculating a capacity retention rate Q _ fdb in a life simulation cycle based on the set discharge cutoff capacity value SOC _ V2G;
step three, judging step: judging whether the capacity retention rate Q _ fdb is within the range of the target value of the battery capacity retention rate; if so, determining that the discharge cutoff capacity value is SOC _ V2G; otherwise, adjusting the discharge cutoff capacity value SOC _ V2G in a PID adjusting mode, and re-executing the steps from the first step to the third step.
Through the arrangement of the steps of the method, PID regulation control (PID regulation control is a traditional control method, is suitable for almost all sites such as temperature, pressure, flow, liquid level and the like and different sites, and in practical engineering, the most widely applied control law is proportional, integral and differential control, PID control for short, also called PID regulation), in the range of discharge capacity under the preset V2G state, through the calculation step and the judgment step, the discharge cut-off capacity value SOC _ V2G under the optimal V2G state is determined, the whole determination procedure is simplified, and the result error is controlled in the minimum range based on the selection of capacity retention ratio as the judgment parameter.
Based on the above overall method steps, in the first step of the present embodiment, the range of discharge capacity SOC in the predetermined V2G state can be set as SOCmin～SOCmaxTo ensure that the discharge cutoff capacity value SOC _ V2G is within a safe and reasonable range for cyclic simulation operation.
In addition, in order to further improve the accuracy, the capacity retention rate allowable error Δ Qmax is also set in the step one to provide a judgment basis for obtaining the parameter result in the step two as follows.
In order to further improve the accuracy of each parameter, in the first step of the embodiment, the discharge cut-off capacity value SOC _ V2G in the V2G state is set according to the parameters of the life simulation of the power battery in the service life. The parameters comprise the cycle working condition, the simulation cycle number and the use condition of the life simulation of the power battery within the service life. In the above, the specific conditions of the operating conditions include operating condition power, vehicle speed, corresponding time and other information required by the service life simulation of the power battery including the operating condition of V2G; the use condition includes information such as an ambient temperature, a vehicle use time, a charging method, and the like.
Based on the description of the above step one, in order to further improve the accuracy of the overall result, in the calculating step related to the step two of this embodiment, based on the set discharge cutoff capacity value SOC _ V2G, the capacity retention rate Q _ fdb in the life simulation cycle is calculated, and at the same time, the battery capacity retention rate target value Q _ ref of the target age is calculated, and finally, the absolute value Δ Q of the difference between the two values is obtained.
Wherein, the target value Q _ ref of the battery capacity retention rate of the target age is obtained by calculating the capacity attenuation value of the battery life simulation unit time. Specifically, the capacity attenuation value of the battery life simulation unit time is the sum of a cycle life attenuation value and a calendar life attenuation value, wherein the cycle life attenuation corresponds to a driving working condition and a charging working condition, and the calendar life attenuation corresponds to a parking working condition.
Wherein, the cycle life attenuation value is calculated by the following formula:
in the formula, Ca is the accumulated amount of real-time capacity usage, and can be obtained by calculating an ampere-hour integral method according to the unit time of life simulation under the working conditions of driving and charging.
In the formula, f1, Ct1, Csoc1 and Ci1 are influence factors, wherein Ct1 is a temperature influence factor attenuated under the battery cycle condition; f1 is a battery capacity cycle life decay acceleration factor function; csoc1 is an SOC influencing factor; ci1 is the current influencing factor. Since the decay rate under the battery cycle condition is related to the battery temperature, SOC, and current, the temperature T, SOC and current I corresponding to the battery at each time must be calculated so that each influence factor (decay factor) is based on the battery charge/discharge cycle test data of the ambient temperature of 25 ℃, the charge/discharge rate of 1C, and 100% DOD SOC (remaining capacity ratio of the battery).
The calendar life decay value is calculated by the following formula:
Thus, the capacity attenuation value per unit time of the battery life simulation can be obtained as follows:
dCloss＝dCcycle_loss+dCcalendar_loss。
by obtaining a capacity decay value dClossThe battery capacity loss and the corresponding battery capacity retention rate of the battery within the set age can be calculated.
Further, it is worth mentioning that the temperature T, SOC and the current I corresponding to the battery at each time are calculated as above, which can be obtained by using the following calculation formula:
the battery power, voltage and current relationship is: power is battery Power, U is battery real-time voltage, and I is battery real-time current.
The battery voltage calculation formula is: and U is OCV + I DCIR, wherein the OCV and DCIR of the battery can be obtained by two-dimensional interpolation according to the current SOC state of the battery and the temperature of the battery, and the current I is negative during discharging and positive during charging.
The SOC calculation formula of the battery is as follows:
wherein Capacity is the Capacity of the battery in the current aging state, SOC0The initial SOC state of the battery is shown, and t is simulation time.
The real-time temperature calculation formula of the battery is as follows:
wherein T is0The initial state temperature of the battery, Ta the ambient temperature, Rth the thermal resistance of the battery, c the specific heat of the battery, and m the mass of the battery.
As described above, it can be known that, in the actual simulation process, the feedback value of the capacity retention rate is Q _ fdb every time the battery life simulation result is obtained, and during the life simulation PID loop process executed, the set SOC _ V2G and the capacity retention rate Q _ fdb are output every time, and the difference between the retention rate and the battery capacity retention rate target value Q _ ref obtained by the above calculation is calculated, so that the absolute value Δ Q of the difference between the two values can be finally obtained, and step three is performed.
In the third step, comparing and judging the obtained delta Q with the capacity retention rate allowable error delta Qmax preset in the first step, if the delta Q is smaller than the delta Qmax, ending the life simulation cycle, and outputting a V2G discharge cut-off SOC set value SOC _ V2G and a capacity retention rate result Q _ fdb; if the capacity retention rate allowable error is larger than the capacity retention rate allowable error delta Qmax, PID adjustment is performed, the V2G discharge cutoff SOC replacement request is completed, and the next life simulation is performed when the SOC _ V2G is replaced.
Fig. 2 shows a graph comparing the life-simulated cycle capacity retention rate with the target battery capacity retention rate under the method of the present invention, and it can be seen that the error of the result of the capacity retention rate can be controlled within a minimum range through 20 cycles of simulation.
Example two
The present embodiment relates to an electric vehicle V2G mode discharge amount determination device, which can be supported by the device of the electric vehicle V2G mode discharge amount determination method according to the first embodiment, and as can be seen from fig. 2, the device mainly comprises a setting module, a calculating module and a judging module. The setting module is used for setting a discharge cut-off capacity value SOC _ V2G in a V2G state within a range of a discharge capacity in a preset V2G state; the calculation module is used for calculating a capacity retention rate Q _ fdb in a life simulation cycle based on the set discharge cutoff capacity value SOC _ V2G; the judging module is used for judging whether the capacity retention rate Q _ fdb is within the range of the target value of the battery capacity retention rate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for determining the discharge capacity of an electric vehicle V2G in a V2G mode is characterized by comprising the following steps:
step one, setting step: setting a discharge cutoff capacity value SOC _ V2G in a V2G state within a predetermined range of the discharge capacity in a V2G state;
step two, calculating step: calculating a capacity retention rate Q _ fdb in a life simulation cycle based on the set discharge cutoff capacity value SOC _ V2G;
step three, judging step: judging whether the capacity retention rate Q _ fdb is within the range of the target value of the battery capacity retention rate; if so, determining that the discharge cutoff capacity value is SOC _ V2G; otherwise, adjusting the discharge cutoff capacity value SOC _ V2G in a PID adjusting mode, and re-executing the steps from the first step to the third step.
2. The electric vehicle V2G mode discharge amount determining method according to claim 1, wherein: step one, setting a capacity retention rate allowable error delta Qmax; in the third step, the absolute value delta Q of the difference between the capacity retention rate Q _ fdb obtained in the second step and the target value Q _ ref of the battery capacity retention rate in the target age is compared with the capacity retention rate allowable error delta Qmax to judge whether the capacity retention rate Q _ fdb is in the range of the target value of the battery capacity retention rate.
3. The electric vehicle V2G mode discharge amount determining method according to claim 2, wherein: the target value Q _ ref of the battery capacity retention ratio of the target age is obtained by calculating a capacity decrement per unit time of the battery life simulation.
4. The electric vehicle V2G mode discharge amount determining method according to claim 3, wherein: the capacity attenuation value of the battery life simulation unit time is the sum of the cycle life attenuation value and the calendar life attenuation value.
5. The electric vehicle V2G mode discharge amount determination method according to claim 4, wherein the cycle life decay value is calculated by the following formula:
wherein Ca is the cumulative amount of real-time capacity usage; f1 is a battery capacity cycle life decay acceleration factor function; ct1 is the temperature-influencing factor for the decay under cell cycling conditions; csoc1 is an SOC influencing factor; ci1 is the current influencing factor.
6. The electric vehicle V2G mode discharge amount determination method according to claim 4, wherein the calendar life decay value is calculated by the following formula:
wherein Tr is storage time under the parking condition; f2 is a battery capacity calendar life decay acceleration factor function; ct2 is the temperature influencing factor; csoc2 is the SOC influencing factor.
7. The method for determining the V2G mode discharge capacity of an electric vehicle as claimed in claim 1, wherein in the step one, the discharge cut-off capacity value SOC _ V2G under the V2G state is set according to the parameters of the life simulation of the power battery in service life.
8. The electric vehicle V2G mode discharge amount determining method according to claim 7, wherein: the parameters comprise the cycle working condition, the simulation cycle number and the use condition of the life simulation of the power battery within the service life.
9. An electric vehicle V2G mode discharge amount determining apparatus, comprising:
a setting module that sets a discharge cutoff capacity value SOC _ V2G in a V2G state within a predetermined range of a discharge capacity in a V2G state;
the calculation module is used for calculating a capacity retention rate Q _ fdb in a life simulation cycle based on the set discharge cutoff capacity value SOC _ V2G;
and the judging module is used for judging whether the capacity retention rate Q _ fdb is within the range of the target value of the battery capacity retention rate.
10. A storage device storing an execution program, characterized in that: the execution program is executed in the steps of the electric vehicle V2G mode discharge amount determination method recited in any one of claims 1 to 8.
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