CN110676522A - Battery output power adjusting method, battery management system and storage medium - Google Patents

Battery output power adjusting method, battery management system and storage medium Download PDF

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CN110676522A
CN110676522A CN201910935572.1A CN201910935572A CN110676522A CN 110676522 A CN110676522 A CN 110676522A CN 201910935572 A CN201910935572 A CN 201910935572A CN 110676522 A CN110676522 A CN 110676522A
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energy
battery
sof
pool
output power
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CN110676522B (en
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王宏伟
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China Express Jiangsu Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4285—Testing apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention relates to the technical field of power batteries, and discloses a method for adjusting battery output power, a battery management system and a storage medium, wherein the method comprises the following steps: acquiring state parameters and working parameters of a battery; obtaining a first SOF of the battery according to the state parameters; wherein the first SOF is the maximum sustained power allowed by the battery; calculating the remaining energy of the energy pool of the battery according to the first SOF and the working parameters; and adjusting the current output power of the battery according to the residual energy of the energy pool, so that the current output power of the battery is gradually reduced to the first SOF along with the reduction of the residual energy. The embodiment can improve the smoothness of the power output of the battery, effectively avoids the phenomenon that the vehicle is subjected to pause feeling due to sudden change of power, ensures the use safety of the battery and prolongs the service life of the battery.

Description

Battery output power adjusting method, battery management system and storage medium
Technical Field
The present invention relates to the field of power battery technologies, and in particular, to a method for adjusting output power of a battery, a battery management system, and a storage medium.
Background
The power battery is an important component of the electric automobile, especially a pure electric automobile, and is the only power for driving the vehicle. The SOF (state of function) of a battery is one of important parameters for characterizing the state of the battery, and is defined as the power that the battery can provide at a specific moment.
At present, a battery map method is generally adopted to estimate the SOF, and specifically, a preset battery power map table is queried to obtain the SOF value. However, in the process of implementing the present invention, the present inventors found that the prior art has at least the following technical problems: when the battery power map is used to obtain the SOF values, the SOF values obtained at different times may have large differences, and therefore, when the vehicle directly outputs power according to the SOF values obtained by query, the vehicle is likely to have a feeling of frustration caused by sudden change of the output power, thereby affecting the driving experience of the user.
Disclosure of Invention
The invention aims to provide a method for adjusting battery output power, a battery management system and a storage medium, which can improve the smoothness of the battery power output, effectively avoid the phenomenon of suspension feeling of a vehicle caused by sudden power change and ensure the safety of a battery.
In order to solve the above technical problem, the present invention provides a method for adjusting output power of a battery, including:
acquiring state parameters and working parameters of a battery;
obtaining a first SOF of the battery according to the state parameters; wherein the first SOF is a maximum sustained power allowed by a battery;
calculating the remaining energy of the energy pool of the battery according to the first SOF and the working parameters;
adjusting the current output power of the battery according to the residual energy of the energy pool, so that the current output power of the battery is gradually reduced to the first SOF along with the reduction of the residual energy.
Preferably, the operating parameters include total voltage of the battery and total current of the battery; then the process of the first step is carried out,
the calculating the remaining energy of the energy pool of the battery according to the first SOF and the operating parameter specifically includes:
calculating the total energy of the energy pool for a preset duration according to the first SOF by the following formula:
wherein Q isTotalIs the total energy of the energy pool; pContinueIs the first SOF; t is t1The preset duration is the preset duration; dt is the basic operation period of the SOF; kSOHIs an adjustment factor;
calculating the accumulated used energy of the energy cell according to the total voltage of the battery and the total current of the battery by the following formula:
wherein Q isActual(ii) cumulative energy used for the energy pool; u shapeBatIs the total voltage of the battery; t is t2T is the accumulated use time of the energy in the energy pool and is more than or equal to 02≤t1；ItIs the total current of the battery; dt is the basic operation period of the SOF;
calculating the remaining energy of the energy pool according to the total energy of the energy pool and the accumulated used energy of the energy pool by the following formula:
QRemain＝QTotal-QActual
wherein Q isRemainIs the remaining energy of the energy pool; qTotalIs the total energy of the energy pool; qActualEnergy is used cumulatively for the energy pool.
Preferably, the method for adjusting the output power of the battery further includes:
obtaining a second SOF of the battery according to the state parameters; wherein the second SOF is a maximum instantaneous power allowed by a battery, and the second SOF is greater than the first SOF; then the process of the first step is carried out,
the adjusting the current output power of the battery according to the remaining energy of the energy pool to gradually decrease the current output power of the battery to the first SOF as the remaining energy decreases specifically includes:
when the residual energy of the energy pool is larger than or equal to a preset first energy, adjusting the current output power of the battery to be the second SOF;
when the residual energy of the energy pool is larger than a preset second energy and smaller than the first energy, adjusting the current output power of the battery to be a first output power; wherein the first output power gradually decreases from the second SOF to approach the first SOF as the residual energy decreases;
when the remaining energy of the energy pool is less than or equal to the second energy, adjusting the current output power of the battery to the first SOF.
As a preferable scheme, when the remaining energy of the energy pool is greater than a preset second energy and smaller than the first energy, adjusting the current output power of the battery to be a first output power specifically includes:
when the residual energy of the energy pool is larger than a preset second energy and smaller than the first energy, calculating the first output power according to the first SOF, the second SOF, the total energy of the energy pool, the residual energy of the energy pool, the first energy and the second energy;
and adjusting the current output power of the battery to be the first output power.
Preferably, the calculating the first output power according to the first SOF, the second SOF, the total energy of the energy pool, the remaining energy of the energy pool, the first energy, and the second energy specifically includes:
calculating the first output power from the first SOF, the second SOF, a total energy of an energy pool, a remaining energy of the energy pool, the first energy, and the second energy by:
Figure BDA0002221480720000031
Figure BDA0002221480720000041
Figure BDA0002221480720000042
Figure BDA0002221480720000043
wherein P is the first output power; pContinueIs the first SOF; pInstantIs the second SOF; k is the ratio of the residual energy of the energy pool to the total energy; qRemainIs the remaining energy of the energy pool; qTotalIs the total energy of the energy pool; krecoverIs the ratio of the first energy to the total energy of the energy pool; q1Is the first energy; kalarmIs the ratio of the second energy to the total energy of the energy pool; q2Is the second energy.
Preferably, the state parameters include a temperature of the battery and a state of charge of the battery; then the process of the first step is carried out,
the obtaining the first SOF of the battery according to the state parameter specifically includes:
and obtaining the first SOF by inquiring a preset battery power map table according to the temperature and the state of charge of the battery.
As a preferred scheme, the obtaining the second SOF of the battery according to the state parameter specifically includes:
and obtaining the second SOF by inquiring a preset battery power map table according to the temperature and the state of charge of the battery.
In order to solve the same technical problem, correspondingly, the present invention further provides a battery management system, including:
the parameter acquisition module is used for acquiring the state parameters and the working parameters of the battery;
the first SOF module is used for obtaining a first SOF of the battery according to the state parameters; wherein the first SOF is a maximum sustained power allowed by a battery;
a residual energy calculation module for calculating a residual energy of an energy pool of a battery according to the first SOF and the operating parameters;
and the current output power adjusting module is used for adjusting the current output power of the battery according to the residual energy of the energy pool, so that the current output power of the battery is gradually reduced to the first SOF along with the reduction of the residual energy.
Preferably, the operating parameters include total voltage of the battery and total current of the battery; then the process of the first step is carried out,
the residual energy calculation module specifically includes:
a total energy calculation unit for calculating, according to the first SOF, a total energy of the energy pool for a preset duration by:
Figure BDA0002221480720000051
wherein Q isTotalIs the total energy of the energy pool; pContinueIs the first SOF; t is t1The preset duration is the preset duration; dt is the basic operation period of the SOF; kSOHIs an adjustment factor;
an accumulated used energy calculation unit for calculating an accumulated used energy of the energy cell by the following formula according to a total voltage of the battery and a total current of the battery:
wherein Q isActual(ii) cumulative energy used for the energy pool; u shapeBatIs the total voltage of the battery; i istIs the total current of the battery; t is t2T is the accumulated use time of the energy in the energy pool and is more than or equal to 02≤t1(ii) a dt is the basic operation period of the SOF;
a residual energy calculation unit, configured to calculate a residual energy of the energy pool according to the total energy of the energy pool and the accumulated used energy of the energy pool by the following formula:
QRemain＝QTotal-QActual
wherein Q isRemainIs the remaining energy of the energy pool; qTotalIs the total energy of the energy pool; qActualEnergy is used cumulatively for the energy pool.
Preferably, the battery management system further includes:
the second SOF module is used for obtaining a second SOF of the battery according to the state parameters; wherein the second SOF is a maximum instantaneous power allowed by a battery, and the first SOF is less than the second SOF;
the current output power adjusting module specifically includes:
a first adjusting unit, configured to adjust a current output power of the battery to the second SOF when a remaining energy of the energy pool is greater than or equal to a preset first energy;
the second adjusting unit is used for adjusting the current output power of the battery to be the first output power when the residual energy of the energy battery is larger than the preset second energy and smaller than the first energy; wherein the first output power gradually decreases from the second SOF to approach the first SOF as the residual energy decreases;
a third adjusting unit, configured to adjust the current output power of the battery to the first SOF when the remaining energy of the energy pool is less than or equal to the second energy.
As a preferred scheme, the second adjusting unit specifically includes:
a first output power calculating subunit, configured to calculate, when the remaining energy of the energy pool is greater than a preset second energy and smaller than the first energy, the first output power according to the first SOF, the second SOF, a total energy of the energy pool, the remaining energy of the energy pool, the first energy, and the second energy;
and the adjusting subunit is used for adjusting the current output power of the battery to be the first output power.
Preferably, the first output power calculation subunit is specifically configured to calculate the first output power according to the first SOF, the second SOF, a total energy of an energy pool, a remaining energy of the energy pool, the first energy, and the second energy by using the following formula:
Figure BDA0002221480720000061
Figure BDA0002221480720000062
Figure BDA0002221480720000063
Figure BDA0002221480720000064
wherein P is the first output power; pContinueIs the first SOF; pInstantIs the second SOF; k is the ratio of the residual energy of the energy pool to the total energy; qRemainIs the remaining energy of the energy pool; qTotalIs the total energy of the energy pool; krecoverIs the ratio of the first energy to the total energy of the energy pool; q1Is the first energy; kalarmIs the ratio of the second energy to the total energy of the energy pool; q2Is the second energy.
Preferably, the state parameters include a temperature of the battery and a state of charge of the battery; then the process of the first step is carried out,
the first SOF module is specifically used for obtaining the first SOF by inquiring a preset battery power map table according to the temperature of the battery and the state of charge of the battery.
Preferably, the state parameters include a temperature of the battery and a state of charge of the battery; then the process of the first step is carried out,
the second SOF module is specifically used for obtaining the second SOF by inquiring a preset battery power map table according to the temperature of the battery and the state of charge of the battery.
In order to solve the same technical problem, the present invention further provides a computer-readable storage medium, which stores a program that, when executed, implements the above-mentioned method for adjusting the output power of a battery.
Compared with the prior art, according to the battery output power adjusting method, the battery management system and the storage medium provided by the invention, the first SOF of the battery is obtained through the acquired state parameters, and the residual energy of the energy pool is calculated according to the first SOF and the acquired working parameters, so that the current output power of the battery can be adjusted according to the residual energy of the energy pool, and the current output power of the battery is gradually reduced to the first SOF along with the reduction of the residual energy, thereby improving the smoothness of the power output of the battery and effectively avoiding the phenomenon of suspension caused by sudden power change of a vehicle; in addition, the embodiment of the invention ensures that the current output power of the battery is gradually converged to the maximum continuous power allowed by the battery under the normal working condition operation state, thereby ensuring the use safety of the battery; in addition, in the embodiment, the current output power of the battery is adjusted according to the residual energy of the energy battery, so that the occurrence of safety accidents such as over-charge or over-discharge of the battery can be prevented in advance, the use safety of the battery is further improved, and the service life of the battery is prolonged.
Drawings
Fig. 1 is a schematic flow chart of a method for regulating battery output power in an embodiment of the present invention;
FIG. 2 is a detailed flowchart of step S13 in FIG. 1;
FIG. 3 is a detailed flowchart of step S14 in FIG. 1;
fig. 4 is a schematic structural diagram of a battery management system in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a method for adjusting output power of a battery according to an embodiment of the present invention.
The method for adjusting the output power of the battery provided by the embodiment of the invention comprises the following steps of S11-S14:
and S11, acquiring the state parameters and the working parameters of the battery.
S12, obtaining a first SOF of the battery according to the state parameters; wherein the first SOF is a maximum sustained power allowed by the battery.
Specifically, according to the state parameters, a preset battery map table is inquired, so that a first SOF of the battery is obtained. It should be noted that the first SOF is specifically the maximum continuous power allowed by the battery without damaging the battery.
And S13, calculating the residual energy of the energy battery of the battery according to the first SOF and the working parameters.
In this step, the energy cell of the battery represents the total energy allowed to be used in the battery for a duration preset in the future; therefore, in specific implementation, the total energy of the energy pool may be calculated according to the first SOF, the accumulated used energy of the energy pool may be calculated according to the operating parameters of the battery, and finally, the remaining energy of the energy pool may be calculated according to the total energy of the energy pool and the accumulated used energy of the energy pool.
And S14, adjusting the current output power of the battery according to the residual energy of the energy pool, so that the current output power of the battery is gradually reduced to the first SOF along with the reduction of the residual energy.
It should be noted that in this embodiment, different residual energies all correspond to a corresponding battery output power, and as the residual energy decreases, the corresponding output power also gradually decreases to the first SOF; therefore, in this step, in implementation, the current output power of the battery is adjusted to the corresponding output power according to the remaining energy of the energy pool.
It is understood that when the battery starts to operate, the remaining energy of the energy pool is gradually decreased, and therefore, the current output power of the battery is gradually decreased to the first SOF as the remaining energy is decreased, specifically as follows: when the remaining energy of the energy pool is reduced to a preset threshold value, the current output power of the battery is adjusted to be the first SOF, and when the remaining energy of the energy pool is continuously reduced to be lower than the preset threshold value, the current output power of the battery is still kept to be the first SOF.
In the embodiment of the invention, the first SOF of the battery is obtained through the obtained state parameters, and the residual energy of the energy pool of the battery is calculated according to the first SOF and the obtained working parameters, so that the current output power of the battery can be adjusted according to the residual energy of the energy pool, and the current output power of the battery is gradually reduced to the first SOF along with the reduction of the residual energy, thereby improving the smoothness of the power output of the battery and effectively avoiding the phenomenon that a vehicle is subjected to brute and jerk due to sudden power change; in addition, the embodiment of the invention ensures that the current output power of the battery is gradually converged to the maximum continuous power allowed by the battery under the normal working condition operation state, thereby ensuring the use safety of the battery; in addition, in the embodiment, the current output power of the battery is adjusted according to the residual energy of the energy battery, so that the occurrence of safety accidents such as over-charge or over-discharge of the battery can be prevented in advance, the use safety of the battery is further improved, and the service life of the battery is prolonged.
Preferably, in step S12, the State parameters include a temperature of the battery and a State of charge (SOC) of the battery; then the process of the first step is carried out,
the obtaining the first SOF of the battery according to the state parameter specifically includes:
and obtaining the first SOF by inquiring a preset battery power map table according to the temperature and the state of charge of the battery.
It should be noted that the preset battery power map is loaded with a mapping relationship between the temperature of the battery and the state of charge of the battery and the first SOF, and a mapping relationship between the temperature of the battery and the state of charge of the battery and the second SOF.
Of course, in the embodiment of the present invention, the first SOF may also be obtained by calculating a function f (SOC, T) according to the temperature of the battery and the state of charge of the battery, where SOC is the state of charge of the battery, and T is the temperature of the battery, which is not described herein again.
Referring to fig. 2, preferably, in step S13, the operating parameters include total voltage of the battery and total current of the battery; then the process of the first step is carried out,
the calculating of the remaining energy of the energy pool of the battery according to the first SOF and the operating parameter specifically includes the following steps S131 to S133:
s131, according to the first SOF, calculating the total energy of the energy pool within a preset duration time by the following formula:
Figure BDA0002221480720000101
wherein Q isTotalIs the total energy of the energy pool; pContinueIs the first SOF; t is t1The preset duration is the preset duration; dt is the basic operation period of the SOF; kSOHIs an adjustment factor; it should be noted that the adjustment coefficient K isSOHIn relation to the SOH (State Of Health) Of the battery, the SOH Of the battery represents the degree Of aging Of the battery.
S132, calculating the accumulated use energy of the energy battery according to the total voltage of the battery and the total current of the battery by the following formula:
Figure BDA0002221480720000102
wherein Q isActual(ii) cumulative energy used for the energy pool; u shapeBatIs the total voltage of the battery; i istIs the total current of the battery; t is t2T is the accumulated use time of the energy in the energy pool and is more than or equal to 02≤t1(ii) a dt is the basic operation period of the SOF, and dt is 100 ms;
s133, calculating the remaining energy of the energy pool according to the total energy of the energy pool and the accumulated used energy of the energy pool by the following formula:
QRemain＝QTotal-QActual
wherein Q isRemainA remaining energy of a battery that is the energy cell; qTotalIs the total energy of the energy pool; qActualEnergy is used cumulatively for the energy pool.
In addition, it should be noted that, the execution sequence between step S131 and step S132 is not limited in the embodiment of the present invention; for example, step S132 may be performed first, and then step S131 may be performed, or step S131 and step S132 may be performed simultaneously.
In the embodiment of the present invention, the method for adjusting the output power of the battery further includes step S12':
s12', obtaining a second SOF of the battery according to the state parameters; wherein the second SOF is a maximum instantaneous power allowed by a battery, and the second SOF is greater than the first SOF. It should be noted that the second SOF is specifically the maximum instantaneous power allowed by the battery without damaging the battery.
Preferably, the obtaining the second SOF of the battery according to the state parameter specifically includes:
and obtaining the second SOF by inquiring a preset battery power map table according to the temperature and the state of charge of the battery.
Preferably, as shown in fig. 3, in step S14, the adjusting the current output power of the battery according to the remaining energy of the energy pool so that the current output power of the battery gradually decreases to the first SOF as the remaining energy decreases includes, in particular, S141 to S143:
s141, when the residual energy of the energy pool is larger than or equal to a preset first energy, adjusting the current output power of the battery to be the second SOF;
s142, when the residual energy of the energy pool is larger than a preset second energy and smaller than the first energy, adjusting the current output power of the battery to be a first output power; wherein the first output power gradually decreases from the second SOF to approach the first SOF as the residual energy decreases; wherein the second energy is less than the first energy;
and S143, when the residual energy of the energy pool is less than or equal to the second energy, adjusting the current output power of the battery to be the first SOF.
Specifically, in step S142, when the remaining energy of the energy pool is greater than a preset second energy and smaller than the first energy, adjusting the current output power of the battery to be a first output power specifically includes:
when the residual energy of the energy pool is larger than a preset second energy and smaller than the first energy, calculating the first output power according to the first SOF, the second SOF, the total energy of the energy pool, the residual energy of the energy pool, the first energy and the second energy;
and adjusting the current output power of the battery to be the first output power.
It should be noted that the first output power is greater than the first SOF and less than the second SOF; and calculating the first output power through the first SOF, the second SOF, the total energy of an energy pool, the residual energy of the energy pool, the first energy and the second energy, so that the calculated first output power can be gradually reduced from the second SOF to approach the first SOF along with the reduction of the residual energy.
Further, the calculating the first output power according to the first SOF, the second SOF, the total energy of the energy pool, the remaining energy of the energy pool, the first energy and the second energy specifically includes:
calculating the first output power from the first SOF, the second SOF, a total energy of an energy pool, a remaining energy of the energy pool, the first energy, and the second energy by:
Figure BDA0002221480720000121
Figure BDA0002221480720000123
Figure BDA0002221480720000124
wherein P is the first output power; pContinueIs the first SOF; pInstantIs the second SOF; k is the ratio of the residual energy of the energy pool to the total energy; qRemainIs the remaining energy of the energy pool; qTotalIs the total energy of the energy pool; krecoverIs the ratio of the first energy to the total energy of the energy pool; q1Is the first energy; kalarmIs the ratio of the second energy to the total energy of the energy pool; q2Is the second energy. It should be noted that the total energy of the energy pool is calculated by the first SOF, which may specifically refer to step S131, and the present invention is not described herein again.
As can be appreciated, in step S14, the remaining energy of the energy pool is compared with the first energy and the second energy, respectively; when the residual energy of the energy pool is larger than or equal to the first energy, the residual energy of the energy pool is more, so that the current output power of the battery is adjusted to the maximum instantaneous power (the second SOF) allowed by the battery, the battery is allowed to output larger power in a short time, and the requirements of the whole vehicle performance and special working conditions are met. When the remaining energy of the energy pool is less than or equal to the second energy, it indicates that the remaining energy of the energy pool is less, and thus the current output power of the battery is adjusted to a relatively smaller maximum allowable continuous power of the battery (the first SOF). When the remaining energy of the energy pool is larger than the second energy and smaller than the first energy, indicating that the remaining energy of the energy pool is moderate, calculating the first output power according to the first SOF, the second SOF, the total energy of the energy pool, the remaining energy of the energy pool, the first energy and the second energy, and adjusting the current output power of the battery to be the first output power; wherein the first output power is gradually reduced from the second SOF towards the first SOF as the remaining energy of the energy pool is reduced. By the step S14, SOF distribution is smoothly and efficiently performed on the premise of ensuring the safety of the battery, so that the efficiency and safety of the battery are ensured, and the smoothness of the power output of the battery is ensured.
In addition, the execution order of steps S141, S142, and S143 is not limited in the present invention.
Fig. 4 is a schematic structural diagram of a battery management system according to an embodiment of the present invention.
Accordingly, an embodiment of the present invention provides a battery management system 1, including:
the parameter acquisition module 11 is used for acquiring state parameters and working parameters of the battery;
the first SOF module 12 is used for obtaining a first SOF of the battery according to the state parameters; wherein the first SOF is a maximum sustained power allowed by a battery;
a residual energy calculation module 13, configured to calculate a residual energy of an energy pool of the battery according to the first SOF and the operating parameter;
and a current output power adjusting module 14, configured to adjust the current output power of the battery according to the remaining energy of the energy pool, so that the current output power of the battery gradually decreases to the first SOF as the remaining energy decreases.
In the embodiment of the present invention, the first SOF module 12 obtains the first SOF of the battery according to the state parameters, and the residual energy calculating module 13 calculates the residual energy of the energy pool of the battery according to the first SOF and the obtained operating parameters, so that the current output power adjusting module 14 can adjust the current output power of the battery according to the residual energy of the energy pool, so that the current output power of the battery is gradually reduced to the first SOF along with the reduction of the residual energy, thereby improving the smoothness of the power output of the battery, and effectively avoiding the phenomenon of vehicle suspension caused by sudden power change; in addition, the embodiment of the invention ensures that the current output power of the battery is gradually converged to the maximum continuous power allowed by the battery under the normal working condition operation state, thereby ensuring the use safety of the battery; in addition, in the embodiment, the current output power of the battery is adjusted according to the residual energy of the energy battery, so that the occurrence of safety accidents such as over-charge or over-discharge of the battery can be prevented in advance, the use safety of the battery is further improved, and the service life of the battery is prolonged.
In a preferred embodiment, the state parameters include the temperature of the battery and the state of charge of the battery; then the process of the first step is carried out,
the first SOF module 12 is specifically configured to obtain the first SOF by querying a preset battery power map table according to the temperature of the battery and the state of charge of the battery.
It should be noted that the preset battery power map is loaded with a mapping relationship between the temperature of the battery and the state of charge of the battery and the first SOF, and a mapping relationship between the temperature of the battery and the state of charge of the battery and the second SOF. Wherein the first SOF is specifically the maximum continuous power allowed by the battery without damaging the battery; the second SOF is in particular the maximum instantaneous power allowed by the battery without constituting damage to the battery.
Of course, in the embodiment of the present invention, the first SOF module 12 may also obtain the first SOF through calculation by a function f (SOC, T) according to the temperature of the battery and the state of charge of the battery, where SOC is the state of charge of the battery, and T is the temperature of the battery, which is not described herein again.
In a preferred embodiment, the operating parameters include a total voltage of the battery and a total current of the battery; then the process of the first step is carried out,
the residual energy calculating module 13 specifically includes:
a total energy calculation unit for calculating, according to the first SOF, a total energy of the energy pool for a preset duration by:
Figure BDA0002221480720000151
wherein Q isTotalIs the total energy of the energy pool; pContinueIs the first SOF; Δ T is the preset duration; t is t1The preset duration is the preset duration; dt is the basic operation period of the SOF; kSOHIs an adjustment factor; it should be noted that the adjustment coefficient K isSOHRelating to the SOH (State Of Health) Of the battery, which represents the degree Of aging Of the battery;
an accumulated used energy calculation unit for calculating an accumulated used energy of the energy cell by the following formula according to a total voltage of the battery and a total current of the battery:
Figure BDA0002221480720000152
wherein Q isActual(ii) cumulative energy used for the energy pool; u shapeBatIs the total voltage of the battery; i istIs the total current of the battery; t is t2T is the accumulated use time of the energy in the energy pool and is more than or equal to 02≤t1(ii) a dt is the basic operation period of the SOF, and dt is 100 ms;
a residual energy calculation unit, configured to calculate a residual energy of the energy pool according to the total energy of the energy pool and the accumulated used energy of the energy pool by the following formula:
QRemain＝QTotal-QActual
wherein Q isRemainIs the remaining energy of the energy pool; qTotalIs the total energy of the energy pool; qActualEnergy is used cumulatively for the energy pool.
In the embodiment of the present invention, the battery management system 1 further includes:
the second SOF module is used for obtaining a second SOF of the battery according to the state parameters; wherein the second SOF is a maximum instantaneous power allowed by a battery, and the first SOF is less than the second SOF.
Preferably, the second SOF module is specifically configured to obtain the second SOF by querying a preset battery power map table according to the temperature of the battery and the state of charge of the battery.
In a preferred embodiment, the current output power adjusting module 14 specifically includes:
a first adjusting unit, configured to adjust a current output power of the battery to the second SOF when a remaining energy of the energy pool is greater than or equal to a preset first energy;
the second adjusting unit is used for adjusting the current output power of the battery to be the first output power when the residual energy of the energy battery is larger than the preset second energy and smaller than the first energy; wherein the first output power gradually decreases from the second SOF to approach the first SOF as the residual energy decreases; wherein the second energy is less than the first energy;
a third adjusting unit, configured to adjust the current output power of the battery to the first SOF when the remaining energy of the energy pool is less than or equal to the second energy.
Further, the second adjusting unit specifically includes:
a first output power calculating subunit, configured to calculate, when the remaining energy of the energy pool is greater than a preset second energy and smaller than the first energy, the first output power according to the first SOF, the second SOF, a total energy of the energy pool, the remaining energy of the energy pool, the first energy, and the second energy;
and the adjusting subunit is used for adjusting the current output power of the battery to be the first output power.
The first output power calculation subunit is specifically configured to calculate the first output power according to the first SOF, the second SOF, a total energy of an energy pool, a remaining energy of the energy pool, the first energy, and the second energy by using the following formula:
Figure BDA0002221480720000161
Figure BDA0002221480720000162
Figure BDA0002221480720000163
Figure BDA0002221480720000164
wherein P is the first output power; pContinueIs the first SOF; pInstantIs the second SOF; k is the ratio of the residual energy of the energy pool to the total energy; qRemainIs the remaining energy of the energy pool; qTotalIs the total energy of the energy pool; krecoverIs the ratio of the first energy to the total energy of the energy pool; q1Is the first energy; kalarmIs the ratio of the second energy to the total energy of the energy pool; q2Is the second energy.
As can be appreciated, the remaining energy of the energy pool is compared to the first energy, the second energy, respectively; when the residual energy of the energy pool is greater than or equal to the preset first energy, the fact that the residual energy of the energy pool is more is indicated, therefore, the current output power of the battery is adjusted to be the maximum instantaneous power (the second SOF) allowed by the battery, the battery is allowed to output larger power in a short time, and the requirements of the whole vehicle performance and special working conditions are met. When the remaining energy of the energy pool is less than or equal to the second energy, it indicates that the remaining energy of the energy pool is less, and therefore, the current output power of the battery is adjusted to the relatively lower maximum allowable continuous power of the battery (the first SOF). When the residual energy of the energy pool is larger than a preset second energy and smaller than the first energy, the residual energy of the energy pool is moderate, the first output power can be calculated according to the first SOF, the second SOF, the total energy of the energy pool, the residual energy of the energy pool, the first energy and the second energy, and the current output power of the battery is adjusted to be the first output power; wherein the first output power is gradually reduced from the second SOF towards the first SOF as the remaining energy of the energy pool is reduced. Therefore, the current output power adjusting module 14 realizes smooth and efficient SOF distribution on the premise of ensuring the safety of the battery, ensures the high efficiency and safety of the battery, and ensures the smoothness of the power output of the battery.
In addition, it should be noted that the battery management system may further include other modules/units, which can implement the above-mentioned method for adjusting the output power of the battery, and further details are not described herein.
Correspondingly, the embodiment of the invention also provides an electric automobile which comprises the battery management system 1.
In order to solve the same technical problem, an embodiment of the present invention further provides a computer-readable storage medium, where a program is stored, and when the program runs, the method for adjusting output power of a battery according to the above-mentioned embodiment is implemented.
In summary, according to the method for adjusting the output power of the battery, the battery management system and the storage medium provided by the present invention, the first SOF of the battery is obtained through the obtained state parameter, and the remaining energy of the energy pool of the battery is calculated according to the first SOF and the obtained operating parameter, so that the current output power of the battery can be adjusted according to the remaining energy of the energy pool, and the current output power of the battery is gradually reduced to the first SOF along with the reduction of the remaining energy, thereby improving the smoothness of the power output of the battery, and effectively avoiding the phenomenon that the vehicle is subjected to a sudden change of power to generate a suspension feeling; in addition, the embodiment of the invention ensures that the current output power of the battery is gradually converged to the maximum continuous power allowed by the battery under the normal working condition operation state, thereby ensuring the use safety of the battery; in addition, in the embodiment, the current output power of the battery is adjusted according to the residual energy of the energy battery, so that the occurrence of safety accidents such as over-charge or over-discharge of the battery can be prevented in advance, the use safety of the battery is further improved, and the service life of the battery is prolonged.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (15)

1. A method for regulating battery output power, comprising:
acquiring state parameters and working parameters of a battery;
obtaining a first SOF of the battery according to the state parameters; wherein the first SOF is a maximum sustained power allowed by a battery;
calculating the remaining energy of the energy pool of the battery according to the first SOF and the working parameters;
and adjusting the current output power of the battery according to the residual energy of the energy pool, so that the current output power of the battery is gradually reduced to the first SOF along with the reduction of the residual energy.
2. The method of regulating output power of a battery according to claim 1, wherein the operating parameters include total voltage of the battery and total current of the battery; then the process of the first step is carried out,
the calculating the remaining energy of the energy pool of the battery according to the first SOF and the operating parameter specifically includes:
calculating the total energy of the energy pool for a preset duration according to the first SOF by the following formula:
Figure FDA0002221480710000011
wherein Q isTotalIs the total energy of the energy pool; pContinueIs the first SOF; t is t1The preset duration is the preset duration; dt is the basic operation period of the SOF; kSOHIs an adjustment factor;
calculating the accumulated used energy of the energy cell according to the total voltage of the battery and the total current of the battery by the following formula:
wherein Q isActual(ii) cumulative energy used for the energy pool; u shapeBatIs the total voltage of the battery; i istIs the total current of the battery; t is t2T is the accumulated use time of the energy in the energy pool and is more than or equal to 02≤t1(ii) a dt is the basic operation period of the SOF;
calculating the remaining energy of the energy pool according to the total energy of the energy pool and the accumulated used energy of the energy pool by the following formula:
QRemain＝QTotal-QActual
wherein Q isRemainIs the remaining energy of the energy pool; qTotalIs the total energy of the energy pool;QActualenergy is used cumulatively for the energy pool.
3. The method for regulating battery output power according to claim 1, further comprising:
obtaining a second SOF of the battery according to the state parameters; wherein the second SOF is a maximum instantaneous power allowed by a battery, and the second SOF is greater than the first SOF; then the process of the first step is carried out,
the adjusting the current output power of the battery according to the remaining energy of the energy pool to gradually decrease the current output power of the battery to the first SOF as the remaining energy decreases specifically includes:
when the residual energy of the energy pool is larger than or equal to a preset first energy, adjusting the current output power of the battery to be the second SOF;
when the residual energy of the energy pool is larger than a preset second energy and smaller than the first energy, adjusting the current output power of the battery to be a first output power; wherein the first output power gradually decreases from the second SOF to approach the first SOF as the residual energy decreases;
when the remaining energy of the energy pool is less than or equal to the second energy, adjusting the current output power of the battery to the first SOF.
4. The method for adjusting output power of a battery according to claim 3, wherein when the remaining energy of the energy pool is greater than a preset second energy and less than the first energy, adjusting the current output power of the battery to be the first output power specifically comprises:
when the residual energy of the energy pool is larger than a preset second energy and smaller than the first energy, calculating the first output power according to the first SOF, the second SOF, the total energy of the energy pool, the residual energy of the energy pool, the first energy and the second energy;
and adjusting the current output power of the battery to be the first output power.
5. The method for adjusting output power of a battery according to claim 4, wherein the calculating the first output power based on the first SOF, the second SOF, a total energy of an energy pool, a remaining energy of the energy pool, the first energy, and the second energy specifically comprises:
calculating the first output power from the first SOF, the second SOF, a total energy of an energy pool, a remaining energy of the energy pool, the first energy, and the second energy by:
Figure FDA0002221480710000031
Figure FDA0002221480710000032
Figure FDA0002221480710000033
Figure FDA0002221480710000034
wherein P is the first output power; pContinueIs the first SOF; pInstantIs the second SOF; k is the ratio of the residual energy of the energy pool to the total energy; qRemainIs the remaining energy of the energy pool; qTotalIs the total energy of the energy pool; krecoverIs the ratio of the first energy to the total energy of the energy pool; q1Is the first energy; kalarmIs the ratio of the second energy to the total energy of the energy pool; q2Is the second energy.
6. The method of regulating battery output power according to any one of claims 1 to 5, wherein the state parameters include a temperature of the battery and a state of charge of the battery; then the process of the first step is carried out,
the obtaining the first SOF of the battery according to the state parameter specifically includes:
and obtaining the first SOF by inquiring a preset battery power map table according to the temperature and the state of charge of the battery.
7. The method of regulating battery output power according to any one of claims 3 to 5, wherein the state parameters include a temperature of the battery and a state of charge of the battery; then the process of the first step is carried out,
the obtaining of the second SOF of the battery according to the state parameter specifically includes:
and obtaining the second SOF by inquiring a preset battery power map table according to the temperature and the state of charge of the battery.
8. A battery management system, comprising:
the parameter acquisition module is used for acquiring the state parameters and the working parameters of the battery;
the first SOF module is used for obtaining a first SOF of the battery according to the state parameters; wherein the first SOF is a maximum sustained power allowed by a battery;
a residual energy calculation module for calculating a residual energy of an energy pool of a battery according to the first SOF and the operating parameters;
and the current output power adjusting module is used for adjusting the current output power of the battery according to the residual energy of the energy pool, so that the current output power of the battery is gradually reduced to the first SOF along with the reduction of the residual energy.
9. The battery management system of claim 8, wherein the operating parameters include a total voltage of the battery and a total current of the battery; then the process of the first step is carried out,
the residual energy calculation module specifically includes:
a total energy calculation unit for calculating, according to the first SOF, a total energy of the energy pool for a preset duration by:
Figure FDA0002221480710000041
wherein Q isTotalIs the total energy of the energy pool; pContinueIs the first SOF; t is t1The preset duration is the preset duration; dt is the basic operation period of the SOF; kSOHIs an adjustment factor;
an accumulated used energy calculation unit for calculating an accumulated used energy of the energy cell by the following formula according to a total voltage of the battery and a total current of the battery:
Figure FDA0002221480710000051
wherein Q isActual(ii) cumulative energy used for the energy pool; u shapeBatIs the total voltage of the battery; i istIs the total current of the battery; t is t2T is the accumulated use time of the energy in the energy pool and is more than or equal to 02≤t1(ii) a dt is the basic operation period of the SOF;
a residual energy calculation unit, configured to calculate a residual energy of the energy pool according to the total energy of the energy pool and the accumulated used energy of the energy pool by the following formula:
QRemain＝QTotal-QActual
wherein Q isRemainIs the remaining energy of the energy pool; qTotalIs the total energy of the energy pool; qActualEnergy is used cumulatively for the energy pool.
10. The battery management system of claim 8, wherein the battery management system further comprises:
the second SOF module is used for obtaining a second SOF of the battery according to the state parameters; wherein the second SOF is a maximum instantaneous power allowed by a battery, and the first SOF is less than the second SOF;
the current output power adjusting module specifically includes:
a first adjusting unit, configured to adjust a current output power of the battery to the second SOF when a remaining energy of the energy pool is greater than or equal to a preset first energy;
the second adjusting unit is used for adjusting the current output power of the battery to be the first output power when the residual energy of the energy battery is larger than the preset second energy and smaller than the first energy; wherein the first output power gradually decreases from the second SOF to approach the first SOF as the residual energy decreases;
a third adjusting unit, configured to adjust the current output power of the battery to the first SOF when the remaining energy of the energy pool is less than or equal to the second energy.
11. The battery management system according to claim 10, wherein the second adjusting unit specifically includes:
a first output power calculating subunit, configured to calculate, when the remaining energy of the energy pool is greater than a preset second energy and smaller than the first energy, the first output power according to the first SOF, the second SOF, a total energy of the energy pool, the remaining energy of the energy pool, the first energy, and the second energy;
and the adjusting subunit is used for adjusting the current output power of the battery to be the first output power.
12. The battery management system of claim 11, wherein the first output power calculation subunit is specifically configured to calculate the first output power based on the first SOF, the second SOF, a total energy of an energy pool, a remaining energy of the energy pool, the first energy, and the second energy by:
Figure FDA0002221480710000061
Figure FDA0002221480710000062
Figure FDA0002221480710000063
Figure FDA0002221480710000064
wherein P is the first output power; pContinueIs the first SOF; pInstantIs the second SOF; k is the ratio of the residual energy of the energy pool to the total energy; qRemainIs the remaining energy of the energy pool; qTotalIs the total energy of the energy pool; krecoverIs the ratio of the first energy to the total energy of the energy pool; q1Is the first energy; kalarmIs the ratio of the second energy to the total energy of the energy pool; q2Is the second energy.
13. The battery management system of any of claims 8-12, wherein the state parameters include a temperature of the battery and a state of charge of the battery; then the process of the first step is carried out,
the first SOF module is specifically used for obtaining the first SOF by inquiring a preset battery power map table according to the temperature of the battery and the state of charge of the battery.
14. The battery management system of any of claims 10-12, wherein the state parameters include a temperature of the battery and a state of charge of the battery; then the process of the first step is carried out,
the second SOF module is specifically used for obtaining the second SOF by inquiring a preset battery power map table according to the temperature of the battery and the state of charge of the battery.
15. A computer-readable storage medium, characterized in that the storage medium has stored thereon a program which, when executed, implements the method of adjusting the output power of a battery according to any one of claims 1 to 7.
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