CN112763918A - Electric vehicle power battery discharge power control method - Google Patents
Electric vehicle power battery discharge power control method Download PDFInfo
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- CN112763918A CN112763918A CN202011541765.8A CN202011541765A CN112763918A CN 112763918 A CN112763918 A CN 112763918A CN 202011541765 A CN202011541765 A CN 202011541765A CN 112763918 A CN112763918 A CN 112763918A
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- 238000007599 discharging Methods 0.000 claims description 23
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The invention provides a method for controlling the discharge power of a power battery of an electric automobile, which comprises the following steps: collecting the discharge peak power and the discharge continuous power of the power battery under different SOCs and different temperatures, and constructing a discharge peak power meter and a discharge continuous power meter; constructing a discharge water pool energy model and a discharge water pool capacity model of the power battery, and controlling the discharge peak power of the power battery according to the discharge water pool energy model, the discharge water pool capacity model, the discharge peak power meter and the discharge continuous power meter; judging whether the voltage value of the single battery of the power battery is larger than a first set value or not, if so, entering the next step, setting a second set value of the voltage of the single battery, and dividing the interval between the first set value and the second set value into N intervals; controlling the discharge peak power of the power battery to be P & ltRa & gt after the voltage of the current single battery is lower than a first set value and is continuously set; and the discharge peak power is decreased progressively along with the increasing of the interval, and the discharge capacity of the battery is fully utilized, so that the phenomenon of power interruption of the electric automobile can be effectively avoided.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a method for controlling discharge power of a power battery of an electric automobile.
Background
In an electric vehicle, the discharge power of a power battery is related to the stable operation of the whole vehicle, so that the discharge power of the power battery needs to be controlled, and the stable operation of the whole vehicle is maintained while the endurance of the power battery is ensured.
In the prior art, the discharge control of the power battery is estimated and controlled based on the SOC (battery state of charge) of the power battery, so that the following defects exist: 1. the requirement on the measurement accuracy of the SOC value of the battery is high, the stable running of the whole vehicle can be ensured only by depending on the accurate SOC value, and the power interruption of a low-temperature state is easily caused if an error exists. 2. The prior art can not fully utilize the discharge capacity of the battery, thereby influencing the endurance performance of the whole vehicle. 3. The aging differences of the individual telecommunications cannot be taken into account and power interruptions are also easily caused.
Therefore, in order to solve the above technical defects, a new technical means is needed.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for controlling a discharge power of a power battery of an electric vehicle, which can accurately control the discharge power of the power battery when a certain error exists in an SOC value of the battery, and can fully utilize the discharge capacity of the battery by considering differences between single batteries in a control process, thereby effectively avoiding a power interruption phenomenon of the electric vehicle, and improving a vehicle stability of the electric vehicle and a cruising ability of the electric vehicle.
The invention provides a method for controlling the discharge power of a power battery of an electric automobile, which comprises the following steps:
s1, collecting discharge peak power and discharge continuous power of a power battery under different SOCs and different temperatures, and constructing a discharge peak power meter and a discharge continuous power meter;
s2, constructing a discharge water pool energy model and a discharge water pool capacity model of the power battery, and controlling the discharge peak power of the power battery according to the discharge water pool energy model, the discharge water pool capacity model, the discharge peak power meter and the discharge continuous power meter;
s3, judging whether the voltage value of the single battery of the power battery is larger than a first set value or not, if so, entering a step S4;
s4, setting a second set value of the voltage of the single battery, and dividing the interval between the first set value and the second set value into N intervals; controlling the discharge peak power of the power battery to be P & ltRa & gt after the voltage of the current single battery is lower than a first set value and is continuously set; wherein, P is the discharge peak power at the moment before the voltage of the single battery reaches the first set value, Ra is the power limiting coefficient, and the discharge peak power decreases with the increasing interval.
Further, in step S3, the discharge pool energy model is specifically:
DWA＝∑(PR-DPP)×Δt；
the model of the capability of the discharging pool is as follows:
DWME＝(DP-DCP)×T1×WR；
wherein PR is the real-time output power of the power battery, and DPP is the peak discharge power look-up table value under different temperatures and different SOC; the DCP is the continuous discharge power of the power battery at different temperatures and different SOC; Δ T is a set control period, T1 is a power battery allowable peak discharge power duration, and WR is a discharge pool limiting coefficient.
Further, in step S3, controlling the discharge peak power of the power cell specifically includes:
inquiring a discharge peak power table and a discharge continuous power table according to the SOC value of the current power battery and the current temperature value, and obtaining a current discharge peak power look-up table value and a current discharge continuous power look-up table value;
if the discharge water pool energy value DWA is larger than the discharge water pool capacity value DWME, limiting the discharge peak power of the current power battery to the current discharge continuous power look-up table value;
and if the discharging pool energy value DWA is less than or equal to 0, limiting the discharging peak power of the current power battery to the current discharging peak power look-up table value.
Further, the decreasing of the discharge peak power with the interval increasing specifically includes:
the first set value and the second set value are divided in an equal gradient descending mode;
setting voltage filtering step length, wherein the change step length of a first voltage interval is step1, and the 2 nd to Nth voltage intervals are fixedly and gradually increased according to stepnekw/s steps;
the discharge peak power of the ith voltage interval is P RaiWherein i is 1,2, …, N; the rate of change is stepi, which is the step size of the change of the ith voltage interval.
Further, the method also includes step S5: and when the current single battery voltage is greater than the sum of the second set value and the set recovery threshold value and lasts for the set time, recovering to the discharge peak power corresponding to the previous voltage interval, and so on until the sum of the first set value and the recovery threshold value and the set time are reached, recovering to P the discharge peak power.
Further, step S3 includes:
when the real-time output power PR of the power battery is less than or equal to the continuous discharge power DCP of the power battery at different temperatures and different SOCs, the energy of the discharge water pool keeps the value at the previous moment;
and when the real-time output power PR of the power battery is less than or equal to the continuous discharge power DCP of the power battery at different temperatures and different SOCs and after the continuous set time, the energy of the discharge water tank is 0.
The invention has the beneficial effects that: according to the invention, the discharging power of the power battery can be accurately controlled under the condition that the SOC value of the battery has a certain error, the difference of single batteries is considered in the control process, and the discharging capacity of the battery can be fully utilized, so that the phenomenon of power interruption of the electric automobile can be effectively avoided, and the whole stability of the electric automobile and the cruising capacity of the electric automobile are improved.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings of the specification:
the invention provides a method for controlling the discharge power of a power battery of an electric automobile, which comprises the following steps:
s1, collecting discharge peak power and discharge continuous power of a power battery under different SOCs and different temperatures, and constructing a discharge peak power meter and a discharge continuous power meter; the discharge peak power and the discharge sustained power of the power battery are different under different SOCs (states of remaining charge) and different temperatures, for example, when the SOC is 80%, the discharge peak power and the discharge sustained power of the power battery are different at the temperatures of 10 ℃, 20 ℃ and the like, so that discharge peak power tables and discharge sustained power tables under different SOCs and different temperature conditions are constructed through practical tests;
s2, constructing a discharge water pool energy model and a discharge water pool capacity model of the power battery, and controlling the discharge peak power of the power battery according to the discharge water pool energy model, the discharge water pool capacity model, the discharge peak power meter and the discharge continuous power meter;
s3, judging whether the voltage value of the single battery of the power battery is larger than a first set value or not, if so, entering a step S4;
s4, setting a second set value of the voltage of the single battery, and dividing the interval between the first set value and the second set value into N intervals; controlling the discharge peak power of the power battery to be P & ltRa & gt after the voltage of the current single battery is lower than a first set value and is continuously set; wherein, P is the discharge peak power of the single battery at the moment before the voltage of the single battery reaches the first set value, Ra is a power limiting coefficient, and the discharge peak power decreases with the increasing of the interval; by the method, the discharging power of the power battery can be accurately controlled under the condition that the SOC value of the battery has a certain error, the difference of the single batteries is considered in the control process, and the discharging capacity of the battery can be fully utilized, so that the phenomenon of power interruption of the electric automobile can be effectively avoided, and the whole stability of the electric automobile and the cruising capacity of the electric automobile are improved.
In this embodiment, in step S3, the discharge pool energy model specifically includes:
DWA＝∑(PR-DPP)×Δt；
the model of the capability of the discharging pool is as follows:
DWME＝(DP-DCP)×T1×WR；
when the real-time output power PR of the power battery is less than or equal to the continuous discharge power DCP of the power battery at different temperatures and different SOCs, the energy of the discharge water pool keeps the value at the previous moment;
when the real-time output power PR of the power battery is less than or equal to the continuous discharge power DCP of the power battery at different temperatures and different SOCs and after the continuous set time, the energy of the discharge water tank is 0;
wherein PR is the real-time output power of the power battery, and DPP is the peak discharge power look-up table value under different temperatures and different SOC; the DCP is the continuous discharge power of the power battery at different temperatures and different SOC; at is the set control period, T1 is the allowable peak discharge power duration of the power battery, WR is the discharge pool limiting coefficient, wherein,
specifically, the method comprises the following steps: in step S3, controlling the discharge peak power of the power cell specifically includes:
inquiring a discharge peak power table and a discharge continuous power table according to the SOC value of the current power battery and the current temperature value, and obtaining a current discharge peak power look-up table value and a current discharge continuous power look-up table value;
if the discharge water pool energy value DWA is larger than the discharge water pool capacity value DWME, limiting the discharge peak power of the current power battery to the current discharge continuous power look-up table value;
if the discharging pool energy value DWA is less than or equal to 0, the discharging peak power of the current power battery is limited to the current discharging peak power look-up table value, and the discharging power of the power battery is estimated and controlled by the method based on the discharging pool, so that the phenomenon of power interruption caused by errors of the SOC value of the power battery is effectively avoided without depending on an accurate SOC value, the discharging capacity of the power battery is fully considered, and the cruising performance of the power battery is effectively ensured.
In this embodiment, the decreasing of the discharge peak power with the increasing interval specifically includes:
the first set value and the second set value are divided in an equal gradient descending mode;
setting voltage filtering step length, wherein the change step length of a first voltage interval is step1, and the 2 nd to Nth voltage intervals are fixedly and gradually increased according to stepnekw/s steps;
the discharge peak power of the ith voltage interval is P RaiWherein i is 1,2, …, N; the rate of change is stepi, which is the change step size of the ith voltage interval, wherein:
further comprising step S5: after the current single battery voltage is greater than the sum of the second set value and the set recovery threshold value and continues for the set time, the discharging peak power corresponding to the previous voltage interval is recovered, and the like, until the sum of the first set value and the recovery threshold value and continues for the set time, the discharging peak power is recovered to P, and by the method, the influence of the single battery voltage is fully considered on the basis of combining the discharging water pool, so that the discharging stability of the power battery is ensured, and the power interruption occurs on the surface; such as: if the first set value and the second set value are divided into 5 intervals, the discharge peak power of the first set value and the second set value is decreased from the 1 st interval to the 5 th interval, and the decreasing mode is calculated according to the method in the above step; when the voltage of the single battery reaches a second set value, the voltage value is greater than the second set value plus the recovery threshold value, and the set time is continued (the set time is set according to the practice), then the discharge peak power of the power battery is recovered to the discharge peak power corresponding to the 4 th interval, if the voltage of the battery continues to rise, the sum of the 4 th interval lower limit voltage value and the recovery threshold value is reached, and the set time is continued, then the discharge peak power of the power battery is recovered to the discharge peak power corresponding to the 3 rd interval, and so on, until the current voltage value of the single battery reaches the first set value plus the recovery threshold value and continues for the set time, the discharge peak power of the power battery is recovered to P.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
1. A method for controlling the discharge power of a power battery of an electric automobile is characterized by comprising the following steps: the method comprises the following steps:
s1, collecting discharge peak power and discharge continuous power of a power battery under different SOCs and different temperatures, and constructing a discharge peak power meter and a discharge continuous power meter;
s2, constructing a discharge water pool energy model and a discharge water pool capacity model of the power battery, and controlling the discharge peak power of the power battery according to the discharge water pool energy model, the discharge water pool capacity model, the discharge peak power meter and the discharge continuous power meter;
s3, judging whether the voltage value of the single battery of the power battery is larger than a first set value or not, if so, entering a step S4;
s4, setting a second set value of the voltage of the single battery, and dividing the interval between the first set value and the second set value into N intervals; controlling the discharge peak power of the power battery to be P & ltRa & gt after the voltage of the current single battery is lower than a first set value and is continuously set; wherein, P is the discharge peak power at the moment before the voltage of the single battery reaches the first set value, Ra is the power limiting coefficient, and the discharge peak power decreases with the increasing interval.
2. The electric vehicle power battery discharge power control method according to claim 1, characterized in that: in step S3, the discharge pool energy model specifically includes:
DWA＝∑(PR-DPP)×Δt；
the model of the capability of the discharging pool is as follows:
DWME＝(DP-DCP)×T1×WR；
wherein PR is the real-time output power of the power battery, and DPP is the peak discharge power look-up table value under different temperatures and different SOC; the DCP is the continuous discharge power of the power battery at different temperatures and different SOC; Δ T is a set control period, T1 is a power battery allowable peak discharge power duration, and WR is a discharge pool limiting coefficient.
3. The electric vehicle power battery discharge power control method according to claim 2, characterized in that: in step S3, controlling the discharge peak power of the power cell specifically includes:
inquiring a discharge peak power table and a discharge continuous power table according to the SOC value of the current power battery and the current temperature value, and obtaining a current discharge peak power look-up table value and a current discharge continuous power look-up table value;
if the discharge water pool energy value DWA is larger than the discharge water pool capacity value DWME, limiting the discharge peak power of the current power battery to the current discharge continuous power look-up table value;
and if the discharging pool energy value DWA is less than or equal to 0, limiting the discharging peak power of the current power battery to the current discharging peak power look-up table value.
4. The electric vehicle power battery discharge power control method according to claim 1, characterized in that: the decreasing of the discharge peak power with the interval increasing specifically includes:
the first set value and the second set value are divided in an equal gradient descending mode;
setting voltage filtering step length, wherein the change step length of a first voltage interval is step1, and the 2 nd to Nth voltage intervals are fixedly and gradually increased according to stepnekw/s steps;
the discharge peak power of the ith voltage interval is P RaiWherein i is 1,2, …, N; the rate of change is stepi, which is the step size of the change of the ith voltage interval.
5. The electric vehicle power battery discharge power control method according to claim 4, characterized in that: further comprising step S5: and when the current single battery voltage is greater than the sum of the second set value and the set recovery threshold value and lasts for the set time, recovering to the discharge peak power corresponding to the previous voltage interval, and so on until the sum of the first set value and the recovery threshold value and the set time are reached, recovering to P the discharge peak power.
6. The electric vehicle power battery discharge power control method according to claim 2, characterized in that: in step S3, the method further includes:
when the real-time output power PR of the power battery is less than or equal to the continuous discharge power DCP of the power battery at different temperatures and different SOCs, the energy of the discharge water pool keeps the value at the previous moment;
and when the real-time output power PR of the power battery is less than or equal to the continuous discharge power DCP of the power battery at different temperatures and different SOCs and after the continuous set time, the energy of the discharge water tank is 0.
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