CN113022311B - Power control method, power control device and vehicle - Google Patents

Power control method, power control device and vehicle Download PDF

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Publication number
CN113022311B
CN113022311B CN202110216940.4A CN202110216940A CN113022311B CN 113022311 B CN113022311 B CN 113022311B CN 202110216940 A CN202110216940 A CN 202110216940A CN 113022311 B CN113022311 B CN 113022311B
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battery
power
power threshold
threshold
control method
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CN113022311A (en
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文明
容航
龙成冰
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Sany Automobile Manufacturing Co Ltd
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Sany Automobile Manufacturing Co Ltd
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Priority to PCT/CN2021/107638 priority patent/WO2022179043A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Secondary Cells (AREA)

Abstract

The invention provides a power control method, a power control device and a vehicle. The power control method comprises the following steps: determining a battery usage power and a battery power threshold; and controlling the battery use power to be reduced to the battery power threshold value based on the fact that the battery use power is larger than the battery power threshold value. Therefore, the overload operation of the battery pack can be avoided, the use safety of the battery pack is ensured, the overcurrent fault of the battery is not triggered, and the good use feeling of a user is ensured. In addition, the advantage that the battery assembly can output larger pulse power in a short time is fully utilized in the process of adjusting the service power of the battery, and the response speed of the battery assembly is improved.

Description

Power control method, power control device and vehicle
Technical Field
The invention relates to the technical field of vehicle control, in particular to a power control method, a power control device and a vehicle.
Background
In the related art, when the power of the whole vehicle continuously reaches the maximum allowable pulse power of the battery, the battery overcurrent protection function is triggered, and at this time, the controller limits the available power of the vehicle according to a certain proportion, or performs power-off processing, so that the actual power of driving is limited below the maximum allowable pulse power of the battery. However, after the power limiting measure is adopted, the output power changes suddenly, the vehicle is easy to shake, a recovery mechanism is needed to ensure normal use requirements, the driving feeling is seriously influenced, and even potential safety hazards are generated.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the invention provides a power control method.
The second aspect of the invention also provides a power control device.
A third aspect of the invention also provides a vehicle.
The fourth aspect of the present invention also provides a readable storage medium.
In view of the above, a first aspect of the present invention provides a power control method, including: determining a battery usage power and a battery power threshold for the battery assembly; and controlling the battery use power to be reduced to the battery power threshold value based on the fact that the battery use power is larger than the battery power threshold value.
According to the power control method provided by the invention, the current battery use power of the battery assembly, namely the available power of the motor which needs to be powered by the battery assembly, is obtained, and the battery power threshold of the battery assembly, namely the maximum allowable pulse power which can be borne by the battery assembly or the maximum allowable pulse power which triggers over-current protection, is determined. When the battery use power is detected to be larger than the battery power threshold, the actual power of the battery assembly exceeds the battery power threshold, the battery assembly is in an overload power supply state, and if the actual power of the battery assembly does not exceed the battery power threshold in time, potential safety hazards such as electric shock and electric leakage are easily caused. The battery power usage is controlled to be reduced to less than or equal to the battery power threshold so that the battery power usage can transition below the battery power threshold. On the one hand, the battery pack is prevented from running in an overload mode, the safety of the battery pack is guaranteed, meanwhile, the overcurrent fault of the battery is prevented from being triggered, and good use feeling of a user is guaranteed. On the other hand, the advantage that the battery pack can output larger pulse power in a short time is fully utilized in the process of adjusting the service power of the battery, and the response speed of the output of the battery pack is improved.
According to the above power control method provided by the present invention, the following additional features may be provided:
in the above technical solution, further, the controlling the battery power to decrease to the battery power threshold includes: and controlling the battery use power to be reduced to be less than or equal to a battery power threshold value within a preset time length, wherein the preset time length comprises the adjustment time length of the maximum allowable pulse power of the battery.
In the technical scheme, when the battery use power is regulated, the battery use power is limited to be reduced to be less than or equal to the battery power threshold value within a preset time period. Therefore, the battery use power is adjusted within the preset time limit, the perception of the user on the power supply change of the battery assembly is weakened, and the use experience of the user is improved.
The preset time duration includes an adjustment time duration for adjusting the battery to the maximum allowable pulse power, and of course, the preset time duration may also be shorter than the adjustment time duration of the maximum allowable pulse power.
In the foregoing technical solution, further controlling the battery power to decrease to be less than or equal to the battery power threshold within the preset time period includes: acquiring a proportional-integral regulation strategy of the battery use power; calculating the adjustment quantity of the battery use power according to a proportional-integral adjustment strategy; calculating target power according to the battery power threshold and the regulating quantity; and regulating the battery use power to the target power within a preset time length.
In the technical scheme, after the fact that the battery use power is larger than the battery power threshold value is detected, a preset proportional-integral regulation strategy (PI control strategy) for adjusting the battery use power is obtained. And calculating the adjustment quantity of the battery use power relative to the battery power threshold value by using the proportional-integral adjustment strategy. And performing difference operation on the battery power threshold and the calculated regulating quantity to determine the target power, and regulating the battery use power to the target power within a preset time length so as to enable the battery use power to be lower than the battery power threshold. Therefore, overcurrent faults of the battery are prevented from being triggered, steady-state errors of the system are eliminated through proportional-integral control, sudden changes of the service power of the battery are effectively avoided, the stability of adjusting the service power of the battery within preset time is guaranteed, the power is adjusted more smoothly, perception of a user on power supply changes of the battery assembly is weakened, and good use feeling of the user is guaranteed.
In any of the above technical solutions, further, calculating an adjustment amount of the battery power usage according to a proportional-integral adjustment strategy includes: calculating a difference between the battery usage power and a battery power threshold; and determining the regulating quantity according to the difference value and the proportional-integral regulating strategy.
In the technical scheme, the difference between the battery use power and the battery power threshold is calculated, and the product of the calculated difference and a proportional-integral regulation strategy is used as the regulation quantity of the battery use power, so that the battery use power is regulated through the regulation quantity.
Specifically, according to the difference value and the proportional-integral regulation strategy, the following formula is adopted for determining the regulation quantity of the battery use power:
ΔP＝Pact-Pbat； (1)
Pmot＝Pbat-ΔP(P+I)； (2)
wherein Δ P is a difference between the battery use power and a battery power threshold, Pact is the battery use power, Pbat is the battery power threshold, Pmot is the target power, i.e., the power output to the motor, Δ P (P + I) is the adjustment amount, P is the proportional link in PI control, and I is the integral link in PI control.
In any of the above technical solutions, further, before adjusting the battery power to the target power within a preset time period, the method further includes: and determining the preset time length according to the difference value and a proportional-integral adjusting strategy.
In the technical scheme, before the battery use power is adjusted, the preset time required by adjustment needs to be determined according to a difference value between the battery use power and a battery power threshold and a proportional-integral adjustment strategy. Therefore, dynamic adjustment under different battery power supply conditions is realized, the power is adjusted smoothly, the response is rapid, and overcurrent protection measures such as power-off treatment are avoided.
Specifically, when the difference value is larger, the adjusting force based on the proportional-integral adjusting strategy is larger, so that the power of the battery assembly can be adjusted to be within the power threshold value of the battery within the preset time period.
In any of the above technical solutions, further controlling the battery power to decrease to the battery power threshold includes: timing the duration that the battery use power is greater than the battery power threshold; and controlling the battery use power to be reduced to the battery power threshold based on the duration being greater than or equal to the duration threshold.
In the technical scheme, after the current battery use power is confirmed to be larger than the battery power threshold, the duration of the battery use power larger than the battery power threshold is started to be counted. And if the duration is greater than or equal to the duration threshold, determining that the battery assembly is in an overload output state. And controlling the battery use power to gradually decrease below the battery power threshold. Therefore, the relation between the battery service power and the battery power threshold is further judged through the duration, the power detection is avoided, the floating error is caused, the overcurrent judgment accuracy is ensured, and the follow-up accurate regulation of the battery service power is facilitated.
In any of the above technical solutions, further determining the battery power includes: collecting battery current and battery voltage; and calculating the battery use power according to the battery current and the battery voltage.
In the technical scheme, the current bus current and the battery voltage of the battery assembly are collected in real time, and the current actual battery use power of the battery assembly, namely the power demand of a user, is calculated. The battery use power comprises discharge power or feedback power.
Specifically, from the battery current and the battery voltage, the following formula is adopted for calculating the battery use power:
Pact＝Ubat×Ibat； (3)
wherein Ubat is the battery voltage and Ibat is the battery current.
It will be appreciated that the battery voltage may be the total battery voltage required to power multiple components, given that the battery component is capable of powering multiple components in the vehicle simultaneously.
In any of the above technical solutions, further determining the battery power threshold includes: collecting battery state of charge and battery temperature; and determining the battery power threshold according to the corresponding relation among the preset charge state, the preset battery temperature and the preset power threshold, the battery charge state and the battery temperature.
In this technical solution, the battery power threshold, that is, the charge/discharge capacity of the battery assembly, is an important factor affecting the use effect of the battery assembly, and the capacity of the battery assembly is related to not only the State of charge (SOC) of the battery but also the battery temperature, so the battery temperature needs to be detected. The battery power threshold corresponding to the battery charge state and the battery temperature type of the battery assembly is searched from a pre-stored discharge power two-dimensional table when the battery charge state and the battery temperature of the battery assembly are acquired, and the battery power threshold is used as the theoretical maximum allowable pulse power of the battery assembly, so that the capacity of the battery assembly is accurately calculated by using the battery charge state and the battery temperature, the battery power threshold is further accurately calculated, the calculation of the power of the battery assembly is simple and convenient, a complex model is not required to be built, and the battery power threshold can be widely applied.
Further, the discharge power two-dimensional table may be generated by testing the battery assembly, specifically, testing the discharge capability (preset power threshold) of the battery assembly at different preset states of charge and different preset battery temperatures in advance, generating a test result, and generating the discharge power two-dimensional table based on the corresponding relationship among the preset states of charge, the preset battery temperatures, and the preset power threshold according to the test result.
According to the second aspect of the present invention, a power control device is further provided, which includes a processor, a memory, and a program or an instruction stored on the memory and executable on the processor, wherein the program or the instruction realizes the steps of the power control method according to the first aspect when executed by the processor. Therefore, the power control apparatus has all the advantageous effects of the power control method of the first aspect.
According to a third aspect of the present invention, there is also provided a vehicle comprising: a battery assembly; in a second aspect, a power control device is provided, and the control device is connected with the battery assembly. Therefore, the vehicle has all the advantageous effects of the power control apparatus of the second aspect.
According to a fourth aspect of the present invention, there is also provided a readable storage medium, on which a program or instructions are stored, which program or instructions, when executed by a processor, performs the power control method of any of the aspects of the first aspect. Thus, the readable storage medium has all the advantageous effects of the power control method of the first aspect.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a flow diagram of a power control method of one embodiment of the invention;
FIG. 2 shows a flow diagram of a power control method according to yet another embodiment of the invention;
FIG. 3 shows a flow diagram of a power control method of yet another embodiment of the invention;
FIG. 4 shows a flow diagram of a power control method of yet another embodiment of the invention;
FIG. 5 shows a flow diagram of a power control method of yet another embodiment of the invention;
FIG. 6 shows a flow diagram of a power control method of yet another embodiment of the invention;
FIG. 7 is a flow chart illustrating a power control method according to an embodiment of the invention;
fig. 8 shows a schematic block diagram of a power control apparatus of an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Power control methods, power control apparatuses, vehicles, and readable storage media according to some embodiments of the present invention are described below with reference to fig. 1 to 8.
Example 1:
as shown in fig. 1, according to an embodiment of the first aspect of the present invention, a power control method is provided, including:
step 102, determining battery use power and a battery power threshold;
and 104, controlling the battery use power to be reduced to the battery power threshold value based on the fact that the battery use power is larger than the battery power threshold value.
In this embodiment, the current battery usage power of the battery assembly, that is, the available power of the motor that needs to be powered by the battery assembly, is obtained, and the battery power threshold of the battery assembly, that is, the maximum allowable pulse power that the battery assembly can bear or the maximum allowable pulse power that triggers over-current protection is determined. When the battery use power is detected to be larger than the battery power threshold, the actual power of the battery assembly exceeds the battery power threshold, the battery assembly is in an overload power supply state, and if the actual power of the battery assembly does not exceed the battery power threshold in time, potential safety hazards such as electric shock and electric leakage are easily caused. The battery power usage is controlled to be reduced to less than or equal to the battery power threshold so that the battery power usage can transition below the battery power threshold. On the one hand, the battery pack is prevented from running in an overload mode, the safety of the battery pack is guaranteed, meanwhile, the overcurrent fault of the battery is prevented from being triggered, and good use feeling of a user is guaranteed. On the other hand, the advantage that the battery pack can output larger pulse power in a short time is fully utilized in the process of adjusting the service power of the battery, and the response speed of the output of the battery pack is improved.
Specifically, the battery use power is regulated by controlling the voltage and current of the battery.
Example 2:
as shown in fig. 2, according to an embodiment of the present invention, there is provided a power control method including:
step 202, determining battery use power and a battery power threshold;
step 204, judging whether the battery use power is larger than a battery power threshold value, if so, entering step 206, and if not, entering step 202;
step 206, obtaining a proportional-integral regulation strategy of the battery use power;
step 208, calculating the adjustment quantity of the battery use power according to a proportional-integral adjustment strategy;
step 210, calculating target power according to a battery power threshold and an adjustment quantity;
and 212, adjusting the battery use power to the target power within a preset time length.
In this embodiment, after it is detected that the battery use power is greater than the battery power threshold, a preset proportional-integral adjustment strategy (PI control strategy) for adjusting the battery use power is acquired. And calculating the adjustment quantity of the battery use power relative to the battery power threshold value by using the proportional-integral adjustment strategy. And performing difference operation on the battery power threshold and the calculated regulating quantity to determine the target power, and regulating the battery use power to the target power within a preset time length so as to enable the battery use power to be lower than the battery power threshold. Therefore, overcurrent faults of the battery are prevented from being triggered, steady-state errors of the system are eliminated through proportional-integral control, sudden changes of the service power of the battery are effectively avoided, the stability of adjusting the service power of the battery within preset time is guaranteed, the power is adjusted more smoothly, perception of a user on power supply changes of the battery assembly is weakened, and good use feeling of the user is guaranteed.
The preset time duration includes an adjustment time duration for adjusting the battery to the maximum allowable pulse power, and of course, the preset time duration may also be shorter than the adjustment time duration of the maximum allowable pulse power.
Further, the battery use power is controlled to be reduced in a stepped manner according to the preset time length, specifically, the adjustment amount can be divided into a plurality of groups of numerical values for reducing the battery use power, and when the battery use power is adjusted, the battery use power is controlled to be reduced each time until the total reduction amount reaches the adjustment amount after the preset time length, and the gradual transition from the battery use power to the target power is completed. Of course, the values of the plurality of groups may be the same or different, for example, the preset time period is 10s, the adjustment amount is 60W/h, that is, the battery use power is reduced by 60W/h, the adjustment period is set to 1s, the control use power is reduced by 6W/h per second, the control use power may also be reduced by 1W/h in the adjustment of the 1 st s, reduced by 2W/h in the adjustment of the 2 nd s, reduced by 4W/h in the adjustment of the 3 rd s, and the reduction amount of the adjustment period is sequentially increased until the battery use power is reduced by 60W/h after 10 s.
Example 3:
as shown in fig. 3, according to an embodiment of the present invention, there is provided a power control method including:
step 302, determining battery use power and a battery power threshold;
step 304, judging whether the battery use power is larger than a battery power threshold value, if so, entering step 306, and if not, entering step 302;
step 306, acquiring a proportional-integral regulation strategy of the battery use power;
step 308, calculating the difference between the battery use power and the battery power threshold;
step 310, determining an adjustment amount and a preset time length according to the difference value and a proportional-integral adjustment strategy;
step 312, calculating a target power according to the battery power threshold and the adjustment amount;
and step 314, adjusting the battery use power to the target power within a preset time length.
In the embodiment, the difference value between the battery use power and the battery power threshold value is calculated, and the product of the calculated difference value and the proportional-integral regulation strategy is used as the regulation quantity of the battery use power, so that the battery use power is regulated through the regulation quantity.
Specifically, according to the difference value and the proportional-integral regulation strategy, the following formula is adopted for determining the regulation quantity of the battery use power:
ΔP＝Pact-Pbat； (1)
Pmot＝Pbat-ΔP(P+I)； (2)
wherein Δ P is a difference between the battery use power and a battery power threshold, Pact is the battery use power, Pbat is the battery power threshold, Pmot is the target power, i.e., the power output to the motor, Δ P (P + I) is the adjustment amount, P is the proportional link in PI control, and I is the integral link in PI control.
It can be understood that, since the battery power usage is greater than the battery power threshold, the calculated difference Δ P is greater than 0, the adjustment amount Δ P (P + I) is also greater than 0, and the difference between the battery power threshold and the adjustment amount is the target power. Of course, the difference between the battery power and the battery power threshold may be calculated by using Δ P ═ Pbat-Pact, where the difference Δ P is negative. The target power Pmot is Pbat + Δ P (P + I).
Further, before the adjustment of the battery power, the preset time period required by the adjustment needs to be determined according to the difference between the battery power and the battery power threshold and the proportional-integral adjustment strategy. Therefore, dynamic adjustment under different battery power supply conditions is realized, the power is adjusted smoothly, the response is rapid, overcurrent protection measures such as power-down processing and the like are avoided being triggered, and the use feeling of a user is not influenced.
Specifically, when the difference value is larger, the adjusting force based on the proportional-integral adjusting strategy is larger, so that the power of the battery pack can be adjusted to be within the power threshold value of the battery within the preset time period.
Example 4:
as shown in fig. 4, according to an embodiment of the present invention, there is provided a power control method including:
step 402, determining battery use power and a battery power threshold;
step 404, judging whether the battery use power is larger than a battery power threshold value, if so, entering step 406, and if not, entering step 402;
step 406, timing the duration that the battery use power is greater than the battery power threshold;
step 408, determining whether the duration is greater than or equal to the duration threshold, if so, entering step 410, and if not, entering step 406;
and step 410, controlling the battery use power to be reduced to be less than or equal to a battery power threshold value within a preset time length.
In this embodiment, after confirming that the current battery usage power is greater than the battery power threshold, a time duration is started for which the battery usage power is greater than the battery power threshold. And if the duration is greater than or equal to the duration threshold, determining that the battery assembly is in an overload output state. And controlling the battery use power to gradually decrease below the battery power threshold value within a preset time period. Therefore, the relation between the battery service power and the battery power threshold is further judged through the duration, the power detection is avoided, the floating error is caused, the overcurrent judgment accuracy is ensured, and the follow-up accurate regulation of the battery service power is facilitated.
Example 5:
as shown in fig. 5, according to an embodiment of the present invention, there is provided a power control method including:
step 502, determining a battery power threshold;
step 504, collecting battery current and battery voltage;
step 506, calculating the battery use power according to the battery current and the battery voltage;
step 508, determining whether the battery power is greater than a battery power threshold, if so, entering step 510, and if not, entering step 504;
and step 510, controlling the battery use power to be reduced to be less than or equal to a battery power threshold value within a preset time length.
In this embodiment, the current bus current and the battery voltage of the battery assembly are collected in real time, and the current actual battery usage power of the battery assembly, that is, the power demand of the user, is calculated. The battery use power comprises discharge power or feedback power.
Specifically, from the battery current and the battery voltage, the following formula is adopted for calculating the battery use power:
Pact＝Ubat×Ibat； (3)
wherein Ubat is the battery voltage and Ibat is the battery current.
It will be appreciated that the battery voltage may be the total battery voltage required to power multiple components, given that the battery component is capable of powering multiple components in the vehicle simultaneously.
Example 6:
as shown in fig. 6, according to an embodiment of the present invention, there is provided a power control method including:
step 602, collecting a battery state of charge and a battery temperature;
step 604, determining a battery power threshold according to a corresponding relation among a preset charge state, a preset battery temperature and a preset power threshold, the battery charge state and the battery temperature;
step 606, obtaining the battery use power;
step 608, determining whether the battery power is greater than the battery power threshold, if so, entering step 610, and if not, entering step 606;
and step 610, controlling the battery use power to be reduced to be less than or equal to a battery power threshold value within a preset time length.
In this embodiment, the battery power threshold, that is, the charging and discharging capacity of the battery assembly, is an important factor affecting the use effect of the battery assembly, and the capacity of the battery assembly is related to not only the State of charge (SOC) of the battery but also the temperature of the battery, so that the temperature of the battery needs to be detected. The battery power threshold corresponding to the battery charge state and the battery temperature type of the battery assembly is searched from a pre-stored discharge power two-dimensional table when the battery charge state and the battery temperature of the battery assembly are acquired, and the battery power threshold is used as the theoretical maximum allowable power of the battery assembly, so that the capacity of the battery assembly is accurately calculated by using the battery charge state and the battery temperature, the battery power threshold is further accurately calculated, the calculation of the power of the battery assembly is simple and convenient, a complex model does not need to be built, and the battery power threshold can be widely applied.
The battery state of charge (SOC) is usually expressed by percentage, the value range of the SOC is 0-1, when the SOC is 0, the battery is completely discharged, and when the SOC is 1, the battery is completely charged. The discharge power two-dimensional table records the corresponding relation among the preset charge state, the preset battery temperature and the preset power threshold.
Further, the discharge power two-dimensional table may be generated by testing the battery assembly, specifically, testing the discharge capability (preset power threshold) of the battery assembly at different preset states of charge and different preset battery temperatures in advance, generating a test result, and generating the discharge power two-dimensional table based on the corresponding relationship among the preset states of charge, the preset battery temperatures, and the preset power threshold according to the test result.
Example 7:
as shown in fig. 7, according to an embodiment of the present invention, taking an electric vehicle as an example, a power control method is provided, which includes:
step 702, determining a battery power threshold according to the battery temperature and the battery SOC;
step 704, calculating the actual use power of the battery;
step 706, comparing the power with the battery power threshold, and taking the difference between the two as Δ P;
step 708, if Δ P is greater than 0, go to step 710, if not, go to step 704;
step 710, triggering a proportional-integral adjustment element to smoothly adjust the power of the application within the adjustment time of the maximum allowable pulse power to be within the battery power threshold.
In this embodiment, the overshoot link is specifically to adjust the power usage to the battery power threshold — the overshoot. The power adjustment amount is used as a PI control link, that is, the larger the Δ P is, the shorter the adjustment time (preset duration) is, and the faster the power reduction response speed is. The service power of the battery assembly is limited within the maximum pulse power of the battery, the overcurrent fault of the whole vehicle cannot be triggered, the power is adjusted smoothly, and the driving feeling cannot be influenced. And the advantage of the pulse power of the battery in a short time can be fully utilized, and the driving response speed is improved.
Example 8:
as shown in fig. 8, according to an embodiment of the second aspect of the present invention, there is provided a power control apparatus 800, including: the processor 804, the memory 802 and a program or instructions stored on the memory 802 and executable on the processor 804, the program or instructions implementing the steps of the power control method proposed in the first aspect embodiment when executed by the processor 804. Therefore, the power control apparatus 800 has all the advantages of the power control method of the first aspect.
Example 9:
according to an embodiment of the third aspect of the present invention, there is also provided a vehicle including: a battery assembly; in an embodiment of the second aspect, the power control device is connected to the battery assembly. Therefore, the vehicle has all the advantageous effects of the power control apparatus of the embodiment of the second aspect.
Specifically, the vehicle includes an electric vehicle and a hybrid vehicle.
Example 10:
according to an embodiment of the fourth aspect of the present invention, there is also proposed a readable storage medium on which a program or instructions are stored, which program or instructions, when executed by a processor, perform the power control method of the first aspect. Therefore, the readable storage medium has all the advantages of the power control method of the embodiment of the first aspect.
In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly and include, for example, fixed connections, detachable connections, or integral connections; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A method of power control, comprising:
determining a battery usage power and a battery power threshold;
controlling the battery use power to be reduced to the battery power threshold value based on the battery use power being greater than the battery power threshold value;
the controlling the battery usage power down to the battery power threshold comprises:
controlling the battery use power to be reduced to be less than or equal to the battery power threshold value within a preset time length;
the preset time length comprises the adjustment time length of the maximum allowable pulse power of the battery;
the controlling the battery use power to be reduced to be less than or equal to the battery power threshold value within a preset time period includes:
acquiring a proportional-integral regulation strategy of the battery use power;
calculating the adjustment quantity of the battery use power according to the proportional-integral adjustment strategy;
calculating target power according to the battery power threshold and the regulating quantity;
and adjusting the battery use power to the target power within the preset time length.
2. The power control method of claim 1, wherein calculating the adjustment amount of the battery usage power according to the proportional-integral adjustment strategy comprises:
calculating a difference between the battery usage power and the battery power threshold;
determining the adjustment quantity according to the difference value and the proportional-integral adjustment strategy;
and calculating the target power according to the battery power threshold and the regulating quantity by adopting the following formula:
ΔP＝Pact-Pbat；
Pmot＝Pbat-ΔP(P+I)；
wherein Δ P is the difference, Pact is the battery usage power, Pbat is the battery power threshold, Pmot is the target power, and Δ P (P + I) is the adjustment amount.
3. The power control method according to claim 2, wherein before adjusting the battery usage power to the target power within the preset time period, the method further comprises:
and determining the preset time length according to the difference value and the proportional-integral adjustment strategy.
4. The power control method of any of claims 1-3, wherein the controlling the battery usage power down to the battery power threshold comprises:
timing a duration that the battery use power is greater than the battery power threshold;
and controlling the battery use power to be reduced to the battery power threshold value based on the duration being greater than or equal to a duration threshold value.
5. The power control method of any of claims 1-3, wherein the determining battery power usage comprises:
collecting battery current and battery voltage;
and calculating the battery use power according to the battery current and the battery voltage.
6. The power control method of any of claims 1-3, wherein the determining a battery power threshold comprises:
collecting battery state of charge and battery temperature;
and determining the battery power threshold according to the corresponding relation among the preset charge state, the preset battery temperature and the preset power threshold, the battery charge state and the battery temperature.
7. A power control apparatus comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the steps of the power control method as claimed in any one of claims 1 to 6.
8. A vehicle, characterized by comprising:
a battery assembly;
the power control device of claim 7, coupled to the battery assembly.
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