CN112763918B - Discharging power control method for power battery of electric automobile - Google Patents
Discharging power control method for power battery of electric automobile Download PDFInfo
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- CN112763918B CN112763918B CN202011541765.8A CN202011541765A CN112763918B CN 112763918 B CN112763918 B CN 112763918B CN 202011541765 A CN202011541765 A CN 202011541765A CN 112763918 B CN112763918 B CN 112763918B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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Abstract
The invention provides a discharge power control method of an electric automobile power battery, 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 pool energy model and a discharge pool capacity model of the power battery, and controlling the discharge peak power of the power battery according to the discharge pool energy model, the discharge pool capacity model, a discharge peak power meter and a discharge continuous power meter; judging whether the voltage value of the single battery of the power battery is larger than a first set value, if so, entering a next step, setting a second set value of the single battery voltage, and dividing a section between the first set value and the second set value into N sections; after the voltage of the current single battery is lower than a first set value and is continuously set, controlling the discharge peak power of the power battery to be P Ra; and the discharge peak power is decreased along with the increment of the interval, and the discharge capacity of the battery is fully utilized, so that the phenomenon that the power of the electric automobile is interrupted 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 discharging power of the power battery is related to the stable operation of the whole vehicle, so that the discharging power of the power battery needs to be controlled, and the stable operation of the whole vehicle is also maintained while the endurance of the power battery is ensured.
In the prior art, the discharge control of the power battery is estimated based on the SOC (state of battery remaining charge) of the power battery, so that there are the following drawbacks: 1. the measurement accuracy requirement on the SOC value of the battery is high, the stable operation of the whole vehicle can be ensured only by relying on the accurate SOC value, and if errors exist, the power interruption in a low-temperature state is easy to cause. 2. The prior art cannot fully utilize the discharging capability of the battery, thereby influencing the endurance performance of the whole vehicle. 3. Aging differences of individual telecommunications cannot be taken into account and power interruption is also easily caused.
Therefore, in order to solve the above technical drawbacks, a new technical means is needed.
Disclosure of Invention
Accordingly, the present invention is directed to a method for controlling the discharge power of a power battery of an electric vehicle, which can accurately control the discharge power of the power battery in the presence of a certain error in the SOC value of the battery, and take into account the difference of the single batteries during the control process, and can fully utilize the discharge capacity of the battery, so that the phenomenon of power interruption of the electric vehicle can be effectively avoided, and the overall stability of the electric vehicle and the endurance capacity of the electric vehicle can be improved.
The invention provides a discharge power control method of an electric automobile power battery, which comprises the following steps:
S1, collecting discharge peak power and discharge continuous power of power batteries under different SOCs and different temperatures, and constructing a discharge peak power meter and a discharge continuous power meter;
s2, constructing a discharge pool energy model and a discharge pool capacity model of the power battery, and controlling the discharge peak power of the power battery according to the discharge pool energy model, the discharge pool capacity model, a discharge peak power meter and a 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, if so, entering a step S4;
S4, setting a second set value of the voltage of the single battery, and dividing a section between the first set value and the second set value into N sections; after the voltage of the current single battery is lower than a first set value and is continuously set, controlling the discharge peak power of the power battery to be P Ra; 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 along with the increment of the interval.
Further, in the step S3, the energy model of the discharge pool is specifically:
DWA＝∑(PR-DPP)×Δt；
The discharge pool capacity model is as follows:
DWME＝(DP-DCP)×T1×WR；
PR is real-time output power of the power battery, and DPP is a peak discharge power table-lookup value under different temperatures and different SOCs; the DCP is the continuous discharge power of the power battery at different temperatures and different SOCs; Δt is a set control period, T1 is a duration of allowable peak discharge power of the power battery, and WR is a discharge pool limit coefficient.
Further, in step S3, controlling the discharge peak power of the power battery specifically includes:
Inquiring a discharge peak power meter and a discharge continuous power meter according to the SOC value and the current temperature value of the current power battery, and obtaining a current discharge peak power table look-up value and a current discharge continuous power table look-up value;
If the discharge pool energy value DWA is larger than the discharge pool capacity value DWME, limiting the discharge peak power of the current power battery to the current discharge continuous power lookup value;
if the discharge pool energy value DWA is smaller than or equal to 0, limiting the discharge peak power of the current power battery to the current discharge peak power lookup value.
Further, the decreasing of the discharge peak power with increasing interval specifically includes:
Dividing the first set value and the second set value in a uniform gradient descending mode;
setting a voltage filtering step length, wherein the changing step length of a first voltage interval is step1, and the 2 nd to N th voltage intervals are fixedly increased according to steponekw/s steps;
The discharge peak power in the ith voltage interval is P Ra i, where i=1, 2, …, N; the change rate is stepi, which is the change step length of the ith voltage interval.
Further, the method further comprises the step S5: and after the current single battery voltage is larger than the sum of the second set value and the set recovery threshold value and the set time is continued, recovering the discharge peak power corresponding to the previous voltage interval, and the like, until the sum of the first set value and the recovery threshold value is reached and the set time is continued, recovering the discharge peak power to P.
Further, in step S3, the method further includes:
When the real-time output power PR of the power battery is smaller than or equal to the continuous discharge power DCP of the power battery under different temperatures and different SOCs, the energy of the discharge pool keeps the value of the last moment;
when the real-time output power PR of the power battery is smaller than or equal to the continuous discharge power DCP of the power battery under different temperatures and different SOCs and after the continuous setting time, the energy of the discharge pool is 0.
The invention has the beneficial effects that: according to the invention, the discharging power of the electric power battery can be accurately controlled under the condition that a certain error exists in the SOC value of the battery, the difference of the single batteries is considered in the control process, and the discharging capability 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 vehicle stability of the electric automobile and the cruising capability of the electric automobile are improved.
Drawings
The invention is further described below with reference to the accompanying drawings 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 attached drawing figures:
The invention provides a discharge power control method of an electric automobile power battery, which comprises the following steps:
S1, collecting discharge peak power and discharge continuous power of power batteries under different SOCs and different temperatures, and constructing a discharge peak power meter and a discharge continuous power meter; the power battery has different discharge peak power and continuous power under different SOCs (residual charge states) and different temperatures, for example, when the SOCs are 80%, the discharge peak power and the continuous power are different at the temperature of 10 ℃,20 ℃ and the like, so that different SOCs, discharge peak power meters under different temperature conditions and discharge continuous power meters are constructed through actual tests;
s2, constructing a discharge pool energy model and a discharge pool capacity model of the power battery, and controlling the discharge peak power of the power battery according to the discharge pool energy model, the discharge pool capacity model, a discharge peak power meter and a 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, if so, entering a step S4;
S4, setting a second set value of the voltage of the single battery, and dividing a section between the first set value and the second set value into N sections; after the voltage of the current single battery is lower than a first set value and is continuously set, controlling the discharge peak power of the power battery to be P Ra; 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 along with the increment of the interval; by the method, the discharging power of the electric battery can be accurately controlled under the condition that a certain error exists in the SOC value of the battery, 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 that the power of the electric automobile is interrupted can be effectively avoided, and the whole vehicle stability of the electric automobile and the cruising ability of the electric automobile are improved.
In this embodiment, in the step S3, the energy model of the discharge pool is specifically:
DWA＝∑(PR-DPP)×Δt；
The discharge pool capacity model is as follows:
DWME＝(DP-DCP)×T1×WR；
When the real-time output power PR of the power battery is smaller than or equal to the continuous discharge power DCP of the power battery under different temperatures and different SOCs, the energy of the discharge pool keeps the value of the last moment;
When the real-time output power PR of the power battery is smaller than or equal to the continuous discharge power DCP of the power battery under different temperatures and different SOCs and after the continuous set time, the energy of the discharge pool is 0;
PR is real-time output power of the power battery, and DPP is a peak discharge power table-lookup value under different temperatures and different SOCs; the DCP is the continuous discharge power of the power battery at different temperatures and different SOCs; deltat is a set control period, T1 is the duration of the allowable peak discharge power of the power battery, WR is the discharge pool limit coefficient, wherein,
Specifically: in step S3, controlling the discharge peak power of the power battery specifically includes:
Inquiring a discharge peak power meter and a discharge continuous power meter according to the SOC value and the current temperature value of the current power battery, and obtaining a current discharge peak power table look-up value and a current discharge continuous power table look-up value;
If the discharge pool energy value DWA is larger than the discharge pool capacity value DWME, limiting the discharge peak power of the current power battery to the current discharge continuous power lookup value;
if the discharge pool energy value DWA is smaller than or equal to 0, limiting the discharge peak power of the current power battery to the current discharge peak power lookup value, and carrying out estimation control on the discharge power of the power battery based on the discharge pool method by the method, so that the phenomenon of power interruption caused by the fact that the power battery has errors due to the fact that the SOC value is not dependent on an accurate SOC value is effectively avoided, the discharge 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 increasing interval specifically includes:
Dividing the first set value and the second set value in a uniform gradient descending mode;
setting a voltage filtering step length, wherein the changing step length of a first voltage interval is step1, and the 2 nd to N th voltage intervals are fixedly increased according to steponekw/s steps;
the discharge peak power in the ith voltage interval is P Ra i, where i=1, 2, …, N; the rate of change is stepi, which is the step of change in 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 the set time is continued, 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 is reached and the set time is continued, recovering the discharge peak power to P. 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 reduced from the 1 st interval to the 5 th interval, and the reduction mode is calculated according to the method; when the voltage of the single battery reaches the second set value and the voltage value is greater than the second set value and the recovery threshold value and is continuously set for a set time (the continuously set time is set according to the actual situation), 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 continuously rises and reaches the sum of the lower limit voltage value of the 4 th interval and the recovery threshold value and is continuously set for a set time, 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 voltage value of the current single battery reaches the first set value and the recovery threshold value and is continuously set for a set time, the discharge peak power of the power battery is recovered to P.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and 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 and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (4)
1. The method for controlling the discharge power of the power battery of the electric automobile is characterized by comprising the following steps of: the method comprises the following steps:
S1, collecting discharge peak power and discharge continuous power of power batteries under different SOCs and different temperatures, and constructing a discharge peak power meter and a discharge continuous power meter;
s2, constructing a discharge pool energy model and a discharge pool capacity model of the power battery, and controlling the discharge peak power of the power battery according to the discharge pool energy model, the discharge pool capacity model, a discharge peak power meter and a 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, if so, entering a step S4;
s4, setting a second set value of the voltage of the single battery, and dividing a section between the first set value and the second set value into N sections; after the voltage of the current single battery is lower than a first set value and lasts for a set time, controlling the discharge peak power of the power battery to be P Ra; 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 along with the increment of the interval;
in the step S3, the energy model of the discharge pool specifically includes:
DWA＝∑(PR-DPP)×△t；
The discharge pool capacity model is as follows:
DWME＝(DP-DCP)×T1×WR；
PR is real-time output power of the power battery, and DPP is a peak discharge power table-lookup value under different temperatures and different SOCs; the DCP is the continuous discharge power of the power battery at different temperatures and different SOCs; delta T is a set control period, T1 is the duration of allowable peak discharge power of the power battery, and WR is a discharge pool limiting coefficient;
in step S3, controlling the discharge peak power of the power battery specifically includes:
Inquiring a discharge peak power meter and a discharge continuous power meter according to the SOC value and the current temperature value of the current power battery, and obtaining a current discharge peak power table look-up value and a current discharge continuous power table look-up value;
If the discharge pool energy value DWA is larger than the discharge pool capacity value DWME, limiting the discharge peak power of the current power battery to the current discharge continuous power lookup value;
if the discharge pool energy value DWA is smaller than or equal to 0, limiting the discharge peak power of the current power battery to the current discharge peak power lookup value.
2. The electric vehicle power battery discharge power control method according to claim 1, characterized in that: the decreasing of the discharge peak power along with the increasing of the interval specifically comprises:
Dividing the first set value and the second set value in a uniform gradient descending mode;
Setting a voltage filtering step length, wherein the changing step length of a first voltage interval is step1, and the 2 nd to N th voltage intervals are fixedly increased according to stepone kw/s steps;
The discharge peak power in the ith voltage interval is P Ra i, where i=1, 2, …, N; the change rate is stepi, which is the change step length of the ith voltage interval.
3. The electric vehicle power battery discharge power control method according to claim 2, characterized in that: further comprising step S5: and after the current single battery voltage is larger than the sum of the second set value and the set recovery threshold value and the set time is continued, recovering the discharge peak power corresponding to the previous voltage interval, and the like, until the sum of the first set value and the recovery threshold value is reached and the set time is continued, recovering the discharge peak power to P.
4. The electric vehicle power battery discharge power control method according to claim 1, characterized in that: in step S3, further includes:
When the real-time output power PR of the power battery is smaller than or equal to the continuous discharge power DCP of the power battery under different temperatures and different SOCs, the energy of the discharge pool keeps the value of the last moment;
when the real-time output power PR of the power battery is smaller than or equal to the continuous discharge power DCP of the power battery under different temperatures and different SOCs and after the continuous setting time, the energy of the discharge pool is 0.
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| CN113391210A (en) * | 2021-06-02 | 2021-09-14 | 合肥国盛电池科技有限公司 | Lithium battery BMS distributed data analysis management system |
| CN115635880B (en) * | 2022-10-31 | 2024-06-18 | 深蓝汽车科技有限公司 | Discharging power control method and system of power battery and electric automobile |
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