CN115257460A - SOC estimation method and device of parallel battery system and vehicle - Google Patents

SOC estimation method and device of parallel battery system and vehicle Download PDF

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Publication number
CN115257460A
CN115257460A CN202210454992.XA CN202210454992A CN115257460A CN 115257460 A CN115257460 A CN 115257460A CN 202210454992 A CN202210454992 A CN 202210454992A CN 115257460 A CN115257460 A CN 115257460A
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battery
soc value
soc
battery pack
value
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郭艳艳
曹志超
王印
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Great Wall Motor Co Ltd
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Great Wall Motor Co Ltd
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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
    • 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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • 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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/15—Preventing overcharging
    • 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
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • 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
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22—Balancing the charge of battery modules
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • 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)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application provides a method and a device for estimating the SOC of a parallel battery system and a vehicle, belonging to the technical field of batteries, wherein the method comprises the following steps: determining actual SOC values corresponding to the battery packs based on the maximum SOC values and the minimum SOC values of the battery packs respectively; and determining the real SOC value of the parallel battery system according to the actual SOC values corresponding to the battery packs, wherein the real SOC value is the SOC value displayed to the instrument. The charging state of each battery pack can be fully considered in the charging process of the plurality of battery packs, so that the real SOC of the parallel battery system can be estimated more accurately, meanwhile, the problem that the charging pile stops running after one battery pack is fully charged is effectively avoided, the battery packs can be charged as much as possible, and the charging effect and the user use experience of the whole vehicle are improved.

Description

SOC estimation method and device of parallel battery system and vehicle
Technical Field
The present application relates to the field of battery technologies, and in particular, to a method and an apparatus for estimating SOC of a parallel battery system, and a vehicle.
Background
In a battery management system, a battery State of Charge (SOC) is a very important battery parameter. The SOC represents the remaining available capacity of the battery as a percentage of the total capacity, and is used to measure the available capacity currently remaining in the battery pack. The accurate SOC estimation provides important reference for the functions of battery safety management, charge and discharge control, whole vehicle energy management and the like of the electric vehicle.
The current method for estimating the SOC is mainly an ampere-hour integral method, the maximum SOC value in a battery pack is used as a real SOC value of the whole pack level during charging, the real SOC value is sent to a charging pile and a user, when the maximum SOC reaches a charging cut-off voltage, the real SOC value is displayed as 100%, and the charging pile stops charging.
However, the existing SOC estimation method often has the following problems when facing a parallel battery system: the maximum SOC values in the multiple parallel battery packs cannot accurately represent the SOC value of the whole pack, if the maximum SOC value is directly used as the real SOC value of the whole pack level, not only is the estimation value and the real value large in error, but also when one of the battery packs is fully charged, the real SOC value is displayed to be 100%, the charging pile stops running, the charging effect is poor, and the cruising range of the whole vehicle and the driving experience of a user are affected finally.
Disclosure of Invention
The application provides a method and a device for estimating the SOC of a parallel battery system and a vehicle, which can accurately estimate the real SOC of the parallel battery system in the charging process of the parallel battery system and improve the charging effect of the whole vehicle.
In order to solve the above problems, the present application adopts the following technical solutions:
in a first aspect, an embodiment of the present application provides a method for estimating SOC of a parallel battery system, where the parallel battery system includes a plurality of battery packs connected in parallel, and the method includes:
determining actual SOC values corresponding to the battery packs based on the maximum SOC values and the minimum SOC values of the battery packs in the process of charging the battery packs;
determining the real SOC value of the parallel battery system according to the actual SOC values corresponding to the battery packs respectively; wherein the true SOC value is the SOC value displayed to the meter.
In an embodiment of the present application, determining an actual SOC value corresponding to each of a plurality of battery packs based on a maximum SOC value and a minimum SOC value of each of the plurality of battery packs includes:
and for each battery pack, carrying out weighted calculation on the maximum SOC value and the minimum SOC value of the battery pack to obtain an actual SOC value corresponding to the battery pack.
In an embodiment of the present application, determining the actual SOC value of the parallel battery system according to the actual SOC values corresponding to the plurality of battery packs includes:
and carrying out weighted calculation on the actual SOC values corresponding to the battery packs respectively to obtain the real SOC value of the parallel battery system.
In an embodiment of the present application, the method further includes:
detecting whether a first target battery pack exists in the plurality of battery packs, wherein the first target battery pack is a fully charged battery pack;
if the first target battery pack exists, quitting charging the first target battery pack, keeping charging the rest battery packs except the first target battery pack, setting the real SOC value as a preset SOC value, and displaying the preset SOC value to the instrument;
repeating the steps in the process of keeping charging of the rest battery packs until the actual SOC value of a second target battery pack is larger than the preset SOC value, and displaying the actual SOC value of the second target battery pack to the instrument in real time; and the second target battery pack is the last battery pack which is not fully charged in the rest battery packs.
In an embodiment of the present application, the actual SOC value of the second target battery pack is obtained by performing weighted calculation on the maximum SOC value and the minimum SOC value of the second target battery.
In an embodiment of the present application, before exiting the charging of the first target battery pack, the method further includes:
and reducing the current charging current of the parallel battery system to a preset current value.
In an embodiment of the present application, after the charging of the first target battery pack is exited, the method further includes:
determining target current values of the other battery packs according to the maximum value of the respective actual SOC values of the other battery packs;
and increasing the current charging current of the parallel battery system from the preset current value to the target current value, and charging the rest battery packs according to the target current value.
In a second aspect, based on the same inventive concept, an embodiment of the present application provides an SOC estimation apparatus for a parallel battery system, where the apparatus is applied to the parallel battery system, the parallel battery system includes a plurality of battery packs connected in parallel, and the apparatus includes:
the actual SOC value determining module is used for determining actual SOC values corresponding to the battery packs on the basis of the maximum SOC values and the minimum SOC values of the battery packs in the process of charging the battery packs;
the real SOC value determining module is used for determining the real SOC value of the parallel battery system according to the actual SOC values corresponding to the battery packs respectively; wherein the true SOC value is the SOC value displayed to the meter.
In an embodiment of the application, the actual SOC value determining module includes:
and the first calculation submodule is used for performing weighted calculation on the maximum SOC value and the minimum SOC value of each battery pack to obtain an actual SOC value corresponding to the battery pack.
In an embodiment of the present application, the true SOC value determining module includes:
and the second calculation submodule is used for performing weighted calculation on actual SOC values corresponding to the plurality of battery packs to obtain the real SOC value of the parallel battery system.
In an embodiment of the present application, the SOC estimation apparatus of a parallel battery system further includes:
the electric quantity detection module is used for detecting whether a first target battery pack exists in the plurality of battery packs, and the first target battery pack is a fully charged battery pack;
the continuous charging module is used for quitting charging the first target battery pack under the condition that the first target battery pack exists, keeping charging of other battery packs except the first target battery pack, and displaying the real SOC value to the instrument after setting the real SOC value as a preset SOC value;
the real-time display module is used for repeating the steps in the process of keeping charging the rest battery packs until the actual SOC value of a second target battery pack is larger than the preset SOC value, and displaying the actual SOC value of the second target battery pack to the instrument in real time; and the second target battery pack is the last battery pack which is not fully charged in the rest battery packs.
In an embodiment of the present application, the actual SOC value of the second target battery pack is obtained by performing weighted calculation on the maximum SOC value and the minimum SOC value of the second target battery.
In an embodiment of the present application, the SOC estimation apparatus of a parallel battery system further includes:
and the current reduction module is used for reducing the current charging current of the parallel battery system to a preset current value before the first target battery pack is quitted from being charged.
In an embodiment of the present application, the SOC estimation apparatus of a parallel battery system further includes:
a target current value determination module, configured to determine a target current value of the remaining battery packs according to a maximum value of respective actual SOC values of the remaining battery packs after the first target battery pack is discharged from being charged;
and the current increasing module is used for increasing the current charging current of the parallel battery system from the preset current value to the target current value and charging the rest battery packs according to the target current value.
In a third aspect, based on the same inventive concept, embodiments of the present application provide a vehicle including a memory for storing a charging processing program of a parallel battery system and a processor; the processor is configured to execute a charging processing program of the parallel battery system, and implement the SOC estimation method of the parallel battery system according to the first aspect of the present application.
Compared with the prior art, the method has the following advantages:
in the SOC estimation method of the parallel battery system, during the charging process of the plurality of battery packs, actual SOC values corresponding to the plurality of battery packs are determined based on the maximum SOC value and the minimum SOC value of each of the plurality of battery packs; and determining the real SOC value of the parallel battery system according to the actual SOC values corresponding to the plurality of battery packs. The charging state of each battery pack can be fully considered in the charging process of the plurality of battery packs, the real SOC of a parallel battery system can be estimated more accurately, the problem that the charging pile stops running after one battery pack is fully charged is avoided, the battery packs are charged as much as possible, and the charging effect and the user use experience of the whole vehicle are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flowchart illustrating steps of a method for estimating SOC of a parallel battery system according to an embodiment of the present disclosure;
FIG. 2 is a flowchart illustrating steps of a method for estimating SOC of a parallel battery system according to another embodiment of the present application;
fig. 3 is a functional block diagram of an SOC estimation apparatus of a parallel battery system according to an embodiment of the present disclosure.
Reference numerals: 200-SOC estimation means for the parallel battery system; 201-actual SOC value determination module; 202-a true SOC value determination module; 203-electric quantity detection module; 204-a continuous charging module; 205-real time display module.
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.
Referring to fig. 1, a method for estimating SOC of a parallel battery system including a plurality of battery packs connected in parallel according to the present application is shown, and the method may include:
s101: in the process of charging the plurality of battery packs, the actual SOC values corresponding to the plurality of battery packs are determined based on the maximum SOC values and the minimum SOC values of the plurality of battery packs.
In this embodiment, SOC (State of Charge), which is a State of Charge, is used to reflect the remaining capacity of the battery, and is numerically defined as a ratio of the remaining capacity to the battery capacity, and is usually expressed as a percentage. The value ranges from 0 to 1, indicating that the battery is completely discharged when SOC =0, and indicating that the battery is completely charged when SOC = 1.
In the present embodiment, each battery pack generally includes a plurality of battery cells, and during the actual charging process, there may be a certain difference between the SOC values of different battery cells in the same battery pack, that is, there are a maximum SOC value and a minimum SOC value in the same battery pack. Specifically, for any battery pack, the voltage values of all the battery cells in the battery pack are obtained, two battery cells with the largest voltage value and the smallest voltage value are selected according to the sequence of the voltage values of the battery cells from large to small, the SOC value corresponding to the battery cell with the largest voltage value is used as the largest SOC value of the battery pack, and the SOC value corresponding to the battery cell with the smallest voltage value is used as the smallest SOC value of the battery pack.
In this embodiment, for each battery pack, a weighting calculation may be performed based on the maximum SOC value and the minimum SOC value of the battery pack to obtain an actual SOC value corresponding to the battery pack. Compared with the method that the maximum SOC value of the battery pack is directly taken or the average value of the maximum SOC value and the minimum SOC value is taken as the actual SOC value of the battery pack through weighting calculation, the calculation result is more real and reliable. Specifically, when the weighting calculation is performed, a higher weight can be assigned to the maximum SOC value, and a lower weight can be assigned to the minimum SOC value, that is, the larger the maximum SOC value is, the closer the result of the weighting calculation is to the maximum SOC value, so that the overcharge phenomenon of the battery can be effectively avoided, and the charging requirement of the battery is met while the battery is effectively protected.
S102: determining the real SOC value of the parallel battery system according to the actual SOC values corresponding to the battery packs respectively; wherein the true SOC value is the SOC value displayed to the meter.
In this embodiment, the actual SOC values corresponding to the plurality of battery packs may be weighted to obtain the actual SOC values of the parallel battery system. Specifically, when performing weighting calculation, the actual SOC values corresponding to the plurality of battery packs may be sorted, and different weights may be assigned according to the actual SOC values, where the greater the actual SOC value is, the greater the assigned weight is, and thus, the calculation result of the actual SOC value may be closer to the greater actual SOC value in the plurality of battery packs.
It should be noted that in this embodiment, the actual SOC value is the SOC value sent to the charging pile and the instrument, where the instrument may be a vehicle-mounted display screen or a preconfigured user terminal for prompting the current charging state of the vehicle battery; and the charging pile controls the charging of the parallel battery system according to the real SOC value, and when the real SOC value received by the charging pile is 1, the charging of the vehicle is stopped.
In the embodiment, the maximum SOC value in the battery pack is not directly used as the actual SOC value of the whole parallel battery system, so that after one battery pack is fully charged, the actual SOC value of the parallel battery system is not directly displayed as 1, and then the charging pile will not stop charging, but continue to charge the battery pack which is not fully charged in the parallel battery system, so that the battery pack can be charged as much as possible, the stability of the power performance of a user in the use process is ensured, and the cruising range of the whole vehicle and the driving experience of the user are improved.
In one possible embodiment, referring to fig. 2, to further improve the charging effect of the parallel battery system, the SOC estimation method of the parallel battery system may further include the following steps:
s103: whether a first target battery pack exists in the plurality of battery packs is detected, and the first target battery pack is a fully charged battery pack.
In the present embodiment, it is possible to determine whether or not the battery pack is fully charged by detecting the voltage value or the actual SOC value at both ends of each battery pack. When the voltage values at the two ends of the battery pack reach the preset cut-off voltage or the actual SOC value of the battery pack reaches 1, the battery pack is a fully charged first target battery pack, and the charging of the first target battery pack can be disconnected.
S104: and if the first target battery pack exists, quitting charging the first target battery pack, keeping charging the other battery packs except the first target battery pack, setting the real SOC value as the preset SOC value, and displaying the preset SOC value to the instrument.
In this embodiment, considering that the existing SOC estimation method uses the maximum SOC in the battery pack as the actual SOC value of the entire pack level, when there is a fully charged battery pack, the actual SOC value will be displayed as 1, and after acquiring the information that the actual SOC value is 1, the charging pile will stop charging the battery pack. In order to avoid the situation that the charging is stopped when the battery packs are not fully charged, after the first target battery pack is quitted to be charged, the real SOC value is set as the preset SOC value and then displayed on the instrument, and therefore the charging pile can continue to charge the other battery packs which are not fully charged. Wherein the preset SOC value may be set to 99%.
It should be noted that, in the present embodiment, a plurality of preset SOC values may be set according to the actual charging condition of the parallel charging system, and the size and the number of the preset SOC values are not specifically limited in this embodiment.
For example, the preset SOC value may be adjusted in real time according to the number of fully charged charging packets. For example, for a parallel charging system in which three battery packs are connected in parallel, when a first fully charged battery pack occurs, the preset SOC value may be set to a lower value, for example, 98%, and when a second fully charged battery pack occurs, the preset SOC value may be adjusted to 99% and displayed on the meter, so that the user may observe the change of the battery charging condition and experience a more real charging experience.
S105: repeating the steps in the process of keeping charging of the rest battery packs until the actual SOC value of the second target battery pack is larger than the preset SOC value, and displaying the actual SOC value of the second target battery pack to an instrument in real time; and the second target battery pack is the last battery pack which is not fully charged in the rest battery packs.
In this embodiment, the above steps are repeated in the process of keeping charging the remaining battery packs, that is, each time a fully charged first target battery pack occurs, the charging of the first target battery pack is exited, and the charging of the remaining battery packs is kept until only the last battery pack that is not fully charged remains, and the battery pack is taken as the second target battery pack. In addition, it should be noted that the steps of S101 to S102 are also a process of continuously updating with the charging, specifically, the actual SOC values corresponding to the plurality of battery packs may be detected and calculated according to a preset frequency, and the actual SOC values of the parallel battery systems may be calculated and updated according to the actual SOC values corresponding to the plurality of battery packs, so that the user may observe the charging state of the parallel battery systems in real time.
In the embodiment, when the actual SOC value of the second target battery pack is less than or equal to the preset SOC value, the preset SOC value is kept unchanged, and the preset SOC value is continuously displayed to the meter; when the actual SOC value of the second target battery pack is larger than the preset SOC value, the actual SOC value of the second target battery pack can represent the actual SOC value of the whole battery pack because the second target battery pack is the last battery pack which is not fully charged, so that the actual SOC value of the second target battery pack is displayed to the instrument in real time, and when the actual SOC value of the second target battery pack reaches 1, all the battery packs are fully charged.
In the present embodiment, the actual SOC value of the second target battery pack is obtained by weighting the maximum SOC value and the minimum SOC value of the second target battery. Specifically, a higher weight can be assigned to the maximum SOC value of the second target battery, and a lower weight can be assigned to the minimum SOC value of the second target battery, so that the actual SOC value of the second target battery pack obtained through weighting calculation can be closer to the maximum SOC value, and thus, the overcharge phenomenon of the second target battery pack can be effectively avoided, and the battery can be effectively protected.
In one example, the preset SOC value may be set to 99%, the parallel battery system includes a battery pack B1 and a battery pack B2 connected in parallel, and during charging of the parallel battery system, actual SOC values of the battery pack B1 and the battery pack B2 are continuously increased, and accordingly, actual SOC values of the parallel battery system are also continuously increased. When the actual SOC value of the battery pack B1 reaches 1, the actual SOC value of the battery pack B2 is only 98%, at this time, the charging of the battery pack B1 is stopped, and when the actual SOC value of the battery pack B2 is less than 99%, the actual SOC value is always displayed as the preset SOC value, that is, 99%. With the continuous charging of the battery pack B2, the actual SOC value of the battery pack B2 exceeds 99%, at the moment, the actual SOC value of the battery pack B2 is displayed in the instrument as a real SOC value, until the SOC value displayed on the instrument is 1, the charging of the battery pack B1 and the battery pack B2 is finished, and the charging pile automatically stops charging the vehicle. Therefore, more electric quantity is charged into the battery pack B2 with low electric quantity in a single-pack electricity supplementing mode, and finally, the two battery packs are both in a full-charge state.
The embodiment of the application can continuously charge the battery pack which is not fully charged under the condition that part of the charging packs in the parallel battery system are fully charged, more electric quantity is charged into the battery pack with low electric quantity, the SOC difference among the battery packs is reduced, meanwhile, the pressure difference of the battery packs is reduced, the stability of the power performance in the use process of a user is ensured, and the cruising mileage of the whole vehicle and the driving experience of the user are improved.
In one possible embodiment, before exiting the charging of the first target battery pack, the method may further include the steps of:
s106: and reducing the current charging current of the parallel battery system to a preset current value.
In this embodiment, considering that the charging current of the parallel battery system is large before the first target battery pack is withdrawn from being charged, if the charging of the first target battery pack is directly withdrawn and the current charging current is kept unchanged, damage may be caused to the remaining charging packs, and therefore, the current charging current of the parallel battery system is reduced to a preset current value with a low value whenever the fully charged first target battery pack is withdrawn from being charged, thereby ensuring that the remaining charging packs are not subjected to overcurrent and improving the charging safety.
In one possible embodiment, after the charging of the first target battery pack is exited, the method may further include the steps of:
s107: and determining the target current values of the other battery packs according to the maximum value of the respective actual SOC values of the other battery packs.
S108: and increasing the current charging current of the parallel battery system from a preset current value to a target current value, and charging the rest battery packs according to the target current value.
In this embodiment, considering that the preset current value is low, if the remaining uncharged charge packets are charged with the preset current value, the charging efficiency is low, and therefore, after the first target battery pack is discharged from being charged, the target current values of the remaining battery packs are determined according to the maximum value of the respective actual SOC values of the remaining battery packs. Specifically, the actual SOC values of the remaining battery packs are calculated through step S101, sorted from large to small according to the actual SOC values, and the maximum value is taken as the maximum actual SOC value, and then the target current values of the remaining battery packs are determined according to the maximum actual SOC value.
In this embodiment, the larger the maximum value among the actual SOC values of the remaining battery packs is, the more the remaining battery packs are charged, the smaller the required target current value is. Therefore, the maximum value of the actual SOC values of the other battery packs is used as a reference, so that the charging efficiency can be improved, the charging time can be shortened, the charging safety of the other battery packs can be ensured, and the overcurrent is avoided.
In this embodiment, when determining the target current values of the remaining battery packs, the current charging temperature of the battery may be combined, so that the target current values may further conform to the current operating condition of the battery. Specifically, a target current value index table may be established in which different battery temperatures and different maximum actual SOC values correspond to different target current values, respectively. In specific application, the real-time charging temperature of the battery can be obtained through a temperature sensor arranged on the battery, and the maximum actual SOC value is determined according to the maximum value of the actual SOC values of the other battery packs which are not fully charged currently; and finally, determining a target current value according with the current working condition of the battery according to the real-time charging temperature and the maximum actual SOC value. Therefore, in different charging stages of the parallel battery system, appropriate target current values can be distributed to the rest battery packs according to different maximum actual SOC values and different charging temperatures.
In a second aspect, based on the same inventive concept, referring to fig. 3, there is shown an SOC estimation apparatus 200 of a parallel battery system according to an embodiment of the present application, where the SOC estimation apparatus 200 of the parallel battery system is applied to the parallel battery system, where the parallel battery system includes a plurality of battery packs connected in parallel, and the SOC estimation apparatus 200 of the parallel battery system includes:
an actual SOC value determining module 201, configured to determine, during charging of the multiple battery packs, actual SOC values corresponding to the multiple battery packs based on maximum SOC values and minimum SOC values of the multiple battery packs, respectively.
The real SOC value determining module 202 is configured to determine a real SOC value of the parallel battery system according to actual SOC values corresponding to the plurality of battery packs, respectively; wherein the true SOC value is the SOC value displayed to the meter.
In one possible implementation, the actual SOC value determining module 201 includes:
and the first calculation submodule is used for performing weighted calculation on the maximum SOC value and the minimum SOC value of each battery pack to obtain an actual SOC value corresponding to the battery pack.
In one possible implementation, the true SOC value determination module 202 includes:
and the second calculation submodule is used for performing weighted calculation on actual SOC values corresponding to the plurality of battery packs respectively to obtain a real SOC value of the parallel battery system.
In one possible embodiment, with continued reference to fig. 2, the SOC estimating apparatus 200 of the parallel battery system may further include:
the electric quantity detection module 203 is used for detecting whether a plurality of battery packs have a first target battery pack, and the first target battery pack is a fully charged battery pack;
and the continuous charging module 204 is configured to quit charging the first target battery pack when the first target battery pack exists, keep charging the remaining battery packs except the first target battery pack, set the actual SOC value to the preset SOC value, and display the preset SOC value to the meter.
The real-time display module 205 is configured to repeat the above steps in the process of keeping charging the remaining battery packs until the actual SOC value of the second target battery pack is greater than the preset SOC value, and display the actual SOC value of the second target battery pack to the meter in real time; the second target battery pack is the last battery pack which is not fully charged in the other battery packs.
In one possible embodiment, the actual SOC value of the second target battery pack is obtained by performing a weighted calculation on the maximum SOC value and the minimum SOC value of the second target battery pack.
In one possible embodiment, the SOC estimation device 200 of the parallel battery system further includes:
and the current reduction module is used for reducing the current charging current of the parallel battery system to a preset current value before the first target battery pack is quitted from being charged.
In one possible embodiment, the SOC estimation device 200 of the parallel battery system further includes:
the target current value determining module is used for determining target current values of other battery packs according to the maximum value of respective actual SOC values of other battery packs after the first target battery pack is charged;
and the current increasing module is used for increasing the current charging current of the parallel battery system from a preset current value to a target current value and charging the rest battery packs according to the target current value.
It should be noted that, for the specific implementation of the SOC estimation device 200 of the parallel battery system according to the embodiment of the present application, reference is made to the specific implementation of the SOC estimation method of the parallel battery system according to the first aspect of the embodiment of the present application, and details are not repeated herein.
In a third aspect, based on the same inventive concept, embodiments of the present application provide a vehicle, including a memory and a processor, the memory storing a charging processing program of a parallel battery system; and the processor is used for executing a charging processing program of the parallel battery system and realizing the SOC estimation method of the parallel battery system according to the first aspect of the application.
It should be noted that, for a specific implementation of the vehicle according to the embodiment of the present application, reference is made to the specific implementation of the method for estimating the SOC of the parallel battery system provided in the first aspect of the embodiment of the present application, and details are not repeated here.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising one of \ 8230; \8230;" does not exclude the presence of additional like elements in a process, method, article, or terminal device that comprises the element.
The SOC estimation method, apparatus and vehicle of the parallel battery system provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained by applying specific examples herein, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A method for estimating SOC of a parallel battery system including a plurality of battery packs connected in parallel, the method comprising:
determining actual SOC values corresponding to the battery packs based on the maximum SOC values and the minimum SOC values of the battery packs in the process of charging the battery packs;
determining the real SOC value of the parallel battery system according to the actual SOC values corresponding to the battery packs respectively; wherein the true SOC value is the SOC value displayed to the meter.
2. The method of claim 1, wherein determining the actual SOC value for each of the plurality of battery packs based on the maximum SOC value and the minimum SOC value for each of the plurality of battery packs comprises:
and for each battery pack, carrying out weighted calculation on the maximum SOC value and the minimum SOC value of the battery pack to obtain an actual SOC value corresponding to the battery pack.
3. The method of claim 1, wherein determining the true SOC value for the parallel battery system from the actual SOC values corresponding to each of the plurality of battery packs comprises:
and carrying out weighting calculation on the actual SOC values corresponding to the battery packs respectively to obtain the real SOC value of the parallel battery system.
4. The method of claim 1, further comprising:
detecting whether a first target battery pack exists in the plurality of battery packs, wherein the first target battery pack is a fully charged battery pack;
if the first target battery pack exists, quitting charging the first target battery pack, keeping charging the rest battery packs except the first target battery pack, setting the real SOC value as a preset SOC value, and displaying the preset SOC value to the instrument;
repeating the steps in the process of keeping charging of the rest battery packs until the actual SOC value of a second target battery pack is larger than the preset SOC value, and displaying the actual SOC value of the second target battery pack to the instrument in real time; and the second target battery pack is the last battery pack which is not fully charged in the rest battery packs.
5. The method of claim 4, wherein the actual SOC value of the second target battery pack is calculated by weighting the maximum SOC value and the minimum SOC value of the second target battery pack.
6. The method of claim 1, wherein prior to exiting charging of the first target battery pack, the method further comprises:
and reducing the current charging current of the parallel battery system to a preset current value.
7. The method of claim 6, wherein after exiting charging of the first target battery pack, the method further comprises:
determining target current values of the rest battery packs according to the maximum value of the actual SOC values of the rest battery packs;
and increasing the current charging current of the parallel battery system from the preset current value to the target current value, and charging the rest battery packs according to the target current value.
8. An SOC estimation apparatus for a parallel battery system, the apparatus being applied to the parallel battery system including a plurality of battery packs connected in parallel, the apparatus comprising:
the actual SOC value determining module is used for determining actual SOC values corresponding to the battery packs on the basis of the maximum SOC values and the minimum SOC values of the battery packs in the process of charging the battery packs;
the real SOC value determining module is used for determining the real SOC value of the parallel battery system according to the actual SOC values corresponding to the battery packs respectively; wherein the true SOC value is the SOC value displayed to the meter.
9. The apparatus of claim 8, wherein the actual SOC value determination module comprises:
and the first calculation submodule is used for performing weighted calculation on the maximum SOC value and the minimum SOC value of each battery pack to obtain an actual SOC value corresponding to the battery pack.
10. A vehicle, characterized in that the vehicle includes a memory for storing a charging processing program of a parallel battery system and a processor; the processor is used for executing a charging processing program of the parallel battery system and realizing the method according to any one of claims 1 to 7.
CN202210454992.XA 2022-04-24 2022-04-24 SOC estimation method and device of parallel battery system and vehicle Pending CN115257460A (en)

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