CN112356737A - Battery charging management method and battery management system - Google Patents

Battery charging management method and battery management system Download PDF

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Publication number
CN112356737A
CN112356737A CN202011295415.8A CN202011295415A CN112356737A CN 112356737 A CN112356737 A CN 112356737A CN 202011295415 A CN202011295415 A CN 202011295415A CN 112356737 A CN112356737 A CN 112356737A
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battery
charging
time
charging stage
stage
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CN112356737B (en
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吴文臣
肖洋
侯卫国
钱立冬
何翔宇
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Shanghai Yingheng Electronic Co ltd
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Shanghai Yingheng Electronic 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • 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
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The embodiment of the invention discloses a battery charging management method and a battery management system. The battery charging management method comprises the following steps: determining a display SOC value of the battery in each charging stage according to charging platform voltages corresponding to each charging stage of the battery and battery core parameters of the battery, wherein the charging stage of the battery is divided according to a fast charging current spectrum of the battery; determining the charging time of the battery in each charging stage according to the displayed SOC value of the battery in each charging stage; acquiring the current working voltage of the battery; and determining the residual charging time of the battery according to the current working voltage and the charging time of the battery in each charging stage. According to the embodiment of the invention, the displayed SOC value of the battery in each charging stage is determined, so that the electric quantity variation of each charging stage is determined, the remaining charging time of the battery under different working voltages is calculated by taking the displayed SOC value as a variable, and the problem of inaccurate display of the quick charging remaining time in the prior art is solved.

Description

Battery charging management method and battery management system
Technical Field
The embodiment of the invention relates to the technical field of batteries, in particular to a battery charging management method and a battery management system.
Background
Along with the popularization of electric vehicles, the user experience of pure electric vehicles is more and more emphasized by people. According to statistics, the problems caused by the conventional pure electric vehicle in the fast charging stage occupy the first three complaint lists of the pure electric vehicle for a long time. In particular, inaccurate display of the remaining time of the quick charge is a great problem which is troubling consumers for a long time. For the electric automobile part company, a unified and universal algorithm cannot be developed to solve the problem in the quick charging stage due to different types of customers and different types of battery models.
In the current mainstream pure electric part development enterprises, an ampere-hour integral method is still mainly adopted to estimate the residual charging time in the fast charging stage. On one hand, the algorithm cannot eliminate accumulated errors in the charging process, and the residual charging time of the battery is changed quickly in a low-temperature environment, so that the automobile cannot be fully charged in winter or in the low-temperature environment. On the other hand, after the battery is aged, the problems that the estimated residual charging time jumps greatly during quick charging, the charging time of the last minute is too long and the like occur due to the increase of the internal resistance.
Disclosure of Invention
The embodiment of the invention provides a battery charging management method and a battery management system, which aim to improve the accuracy of estimating the quick charging remaining time of a battery.
In a first aspect, an embodiment of the present invention provides a battery charging management method, including:
determining a display SOC value of the battery in each charging stage according to charging platform voltages corresponding to each charging stage of the battery and electric core parameters of the battery, wherein the charging stage of the battery is divided according to a fast charging current spectrum of the battery;
determining the charging time of the battery in each charging stage according to the display SOC value of the battery in each charging stage;
acquiring the current working voltage of the battery;
and determining the residual charging time of the battery according to the current working voltage and the charging time of the battery in each charging stage.
Optionally, the determining the display SOC value of the battery at each charging stage according to the charging platform voltage and the electric core parameter of the battery includes:
determining the open-circuit voltage of the battery at each charging stage according to the charging platform voltage and the battery core parameters of the battery;
and determining the display SOC value of the battery at each charging stage according to the open-circuit voltage.
Optionally, according to the charging platform voltage and the electric core parameter of the battery, the open-circuit voltage of the battery at each charging stage is determined according to the following relationship:
OCVSOC，temp＝USOC，temp+I*DCRtemp，SOH (1)
in the formula: OCVSOC，tempIs open circuit voltage, USOC，tempWorking voltages corresponding to different temperatures and SOC values in a fast charging current spectrum, I is charging current, DCRtemp，SOHFeeding back the internal resistance for the pulses corresponding to different temperatures and SOC values.
Optionally, the determining the charging time of the battery in each charging stage according to the displayed SOC value of the battery in each charging stage includes:
determining the charging time of the battery in each charging stage according to the display SOC value of the battery in each charging stage according to the following formula:
Figure BDA0002785262700000031
in the formula: cell _ TimeiThe charging time required for the ith charging stage;
SOCidisplaying the SOC value corresponding to the ith charging stage;
SOCi-1displaying the SOC value corresponding to the i-1 th charging stage;
cap is the rated capacity of the battery cell;
SOH is the state of health value of the battery;
DcChrgCurrMapithe charging current of the battery electric core corresponding to the ith charging stage.
Optionally, determining the remaining charging time of the battery according to the current working voltage and the charging time of the battery in each charging stage includes:
determining a current charging stage corresponding to the current working voltage and a previous charging stage adjacent to the current charging stage;
determining the residual charging time of the battery until the previous charging stage according to the current charging stage and the charging time of the battery in each charging stage;
and determining the residual charging time of the battery according to the residual charging time of the battery in the previous charging stage and the current working voltage.
Optionally, the determining the remaining charging time of the battery according to the remaining charging time of the battery up to the previous charging stage and the current working voltage includes:
determining the remaining charging time of the battery according to the remaining charging time of the battery up to the previous charging stage and the current working voltage according to the following formula:
Figure BDA0002785262700000032
in the formula: ChrgTimeinputIs the remaining charging time corresponding to the current operating voltage;
ChrgTimei-1the residual charging time corresponding to the previous charging stage of the current working voltage is obtained;
Cell_Voltinputthe current working voltage is the voltage value of the current working voltage;
Cell_Voltithe charging platform voltage value of the current charging stage corresponding to the current working voltage;
Cell_Volti-1the charging platform voltage value of the charging stage before the current charging stage;
Cell_Timeithe charging time of the current charging stage.
Optionally, after the determining the remaining charging time of the battery, the method further includes:
filtering the residual charging time;
and updating the residual charging time after the filtering processing according to a preset time interval.
In a second aspect, an embodiment of the present invention further provides a battery management system, including:
the display electric quantity determining module is used for determining the display SOC value of the battery in each charging stage according to the charging platform voltage corresponding to each charging stage of the battery and the electric core parameter of the battery, wherein the charging stage of the battery is divided according to the fast charging current spectrum of the battery;
the charging time determining module is used for determining the charging time of the battery in each charging stage according to the display SOC value of the battery in each charging stage;
the voltage acquisition module is used for acquiring the current working voltage of the battery;
and the residual charging time determining module is used for determining the residual charging time of the battery according to the current working voltage and the charging time of the battery in each charging stage.
According to the battery charging management method provided by the embodiment of the invention, the charging process of the battery is divided into a plurality of charging stages according to the quick charging current spectrum of the battery, each charging stage corresponds to a charging platform voltage, the display SOC value of the battery in each charging stage is determined based on the charging platform voltage and the battery cell parameter of the battery, and the electric quantity variation of each charging stage is calculated through each display SOC value, so that the charging time of each charging stage is calculated based on the electric quantity variation of each charging stage. The charging stage of the battery can be determined by detecting the working voltage of the battery in the charging process in real time, and the remaining charging time of the battery corresponding to the current working voltage can be calculated by the obtained corresponding relation between each charging stage and the charging time. In the embodiment, the display SOC value of the battery is calculated based on the charging voltage of the battery, and the remaining charging time of the battery under different working voltages is calculated by taking the display SOC value as a variable, because the remaining charging time in the embodiment is calculated by calculating the display SOC value of each charging stage through the charging platform voltage of the battery, and the charging platform voltage of the battery is a determined value, the problems of sudden change and the like do not exist, the problems of no jump, quick change of the charging time and the like of the remaining charging time of the battery obtained by the embodiment of the invention are solved, the problem of inaccurate display of the quick charging remaining time in the prior art is solved, and the matching display of the current charging capacity and the remaining charging time is realized.
Drawings
Fig. 1 is a flowchart of a battery charging management method according to an embodiment of the present invention;
fig. 2 is a flowchart of another battery charging management method according to an embodiment of the present invention;
FIG. 3 is a flow chart of another method for battery charge management according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a battery management system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a battery charging management method according to an embodiment of the present invention, where the battery charging management method is applicable to a situation where a battery management system needs to accurately display a remaining charging time of a battery during a charging process of the battery. The battery charge management method may be performed by a battery management system, and referring to fig. 1, the battery charge management method includes:
and S110, determining the display SOC value of the battery in each charging stage according to the charging platform voltage corresponding to each charging stage of the battery and the battery cell parameter of the battery.
The charging stage of the battery is divided according to the quick charging current spectrum of the battery. Before the battery is charged, the charging process of the battery can be divided into a plurality of charging stages according to the battery quick charging current spectrum, and each charging stage corresponds to a charging platform voltage.
The charging platform voltage is used for the battery management system to adjust the charging current of the battery in real time, so that the charging voltage of the battery does not exceed the corresponding charging platform voltage in each charging stage. If the voltage of the battery reaches the charging platform voltage under the current charging current, the battery management system reduces the charging current and enters the next charging stage so as to control the charging current to continue charging according to the charging platform voltage not exceeding the next charging stage. And the battery management system controls the charging current according to the method until the charging is finished.
The display SOC (State of Charge) value of the battery is used for displaying the residual capacity of the battery. The display SOC value corresponds to the residual charging time of the battery, synchronous change and adaptation of the display SOC value and the residual charging time of the battery are achieved, and a user can conveniently and visually check the charging quantity and the residual charging time of the battery which are finished currently.
The display SOC value in this embodiment may be calculated by a working voltage value of the battery, specifically, the open-circuit voltage of the battery may be calculated by the working voltage of the battery, and then the display SOC value of the battery may be obtained by the open-circuit voltage based on a battery core characteristic table of the battery. Thereby establishing the corresponding relation between each charging voltage platform and the display SOC value of the battery.
It should be noted that, in the present embodiment, the displayed SOC value at each charging stage is related to the cell temperature of the battery, and thus the cell parameter in the present embodiment at least needs to include the cell temperature.
And S120, determining the charging time of the battery in each charging stage according to the displayed SOC value of the battery in each charging stage.
The charging time of each charging stage refers to the charging time between two adjacent charging platforms. According to the analysis, each charging platform corresponds to one display SOC value, so that the electric quantity variation of each charging stage can be calculated according to the display SOC values of the voltages of two adjacent charging platforms. It is known that the charging time of the battery in each charging phase is related to the amount of change of the amount of electricity in the charging phase, so that the charging time required for each charging phase can be calculated based on the determined amount of change of the amount of electricity in each charging phase.
And S130, acquiring the current working voltage of the battery.
The current working voltage of the battery refers to the real-time charging voltage of the battery in the charging process. As discussed above, the battery management system adjusts the charging current at each charging station of the battery to control the charging voltage not to exceed the charging station voltage corresponding to the current charging phase. Therefore, the voltage value of the battery is changed in each charging stage, and the battery management system detects the charging working voltage of the battery in the charging process in real time so as to update the residual charging time of the battery through the acquired current working voltage.
And S140, determining the residual charging time of the battery according to the current working voltage and the charging time of the battery in each charging stage.
After the processing of the steps, the corresponding relation between each charging stage and the required charging time of the battery at different temperatures can be obtained.
The charging stage of the battery can be determined by acquiring the working voltage of the battery in real time, and the remaining charging time of the battery under the current charging voltage can be determined according to the corresponding relation between the determined charging stage and the charging time.
The working principle of the embodiment of the invention is as follows: the battery management system calculates the display SOC value of each charging stage according to the divided charging stages, determines the electric quantity variation of each charging stage according to the display SOC value of each charging stage, calculates the charging time required by each charging stage based on the electric quantity variation, and corresponds the working voltage of the battery detected in real time to the corresponding charging stage by using an interpolation method, thereby calculating the residual charging time corresponding to each working voltage.
According to the battery charging management method provided by the embodiment of the invention, the charging process of the battery is divided into a plurality of charging stages according to the quick charging current spectrum of the battery, each charging stage corresponds to a charging platform voltage, the display SOC value of the battery in each charging stage is determined based on the charging platform voltage and the battery cell parameter of the battery, and the electric quantity variation of each charging stage is calculated through each display SOC value, so that the charging time of each charging stage is calculated based on the electric quantity variation of each charging stage. The charging stage of the battery can be determined by detecting the working voltage of the battery in the charging process in real time, and the remaining charging time of the battery corresponding to the current working voltage can be calculated by the obtained corresponding relation between each charging stage and the charging time. In the embodiment, the display SOC value of the battery is calculated based on the charging voltage of the battery, and the remaining charging time of the battery under different working voltages is calculated by taking the display SOC value as a variable, because the remaining charging time in the embodiment is calculated by calculating the display SOC value of each charging stage through the charging platform voltage of the battery, and the charging platform voltage of the battery is a determined value, the problems of sudden change and the like do not exist, the problems of no jump, quick change of the charging time and the like of the remaining charging time of the battery obtained by the embodiment of the invention are solved, the problem of inaccurate display of the quick charging remaining time in the prior art is solved, and the matching display of the current charging capacity and the remaining charging time is realized.
Optionally, on the basis of the above technical solution, after determining the remaining charging time of the battery, the battery charging management method further includes:
filtering the residual charging time;
and updating the residual charging time after the filtering processing according to a preset time interval.
Specifically, the remaining charge time is subjected to filtering processing, the calculated remaining charge time can be smoothed, and a smoothed remaining charge schedule is established so that the remaining charge time is updated at set time intervals. For example, every 10 s. Meanwhile, the maximum amplitude of each jump is limited, for example, the maximum amplitude of each jump is 1 minute, that is, only 1 minute is allowed to be reduced at most within the update time with the preset time interval of 10s, and the reduction is not allowed to be more than 1 minute.
Optionally, fig. 2 is a flowchart of another battery charging management method according to an embodiment of the present invention, and the battery charging management method is further optimized based on the foregoing embodiment. Referring to fig. 2, the battery charging management method specifically includes:
s210, determining the open-circuit voltage of the battery at each charging stage according to the charging platform voltage and the battery core parameters of the battery.
In the present embodiment, only the influence of battery aging on the internal resistance of the battery is considered, that is, the open-circuit voltage of the battery is estimated through the charging platform voltage of the battery, and then the display SOC value of the battery is determined according to the open-circuit voltage.
Specifically, the open circuit voltage of the battery at each charging stage can be determined by the following equation:
OCVSOC，temp＝USOC，temp+I*DCRtemp，SOH (1)
in the formula: OCVSOC，tempIs open circuit voltage, USOC，tempWorking voltages corresponding to different temperatures and SOC values in a fast charging current spectrum, I is charging current, DCRtemp，SOHFeeding back the internal resistance for the pulses corresponding to different temperatures and SOC values.
Wherein the DCRtemp，SOHThe aging state of the battery can be correspondingly calculated according to the SOC value of the battery. The SOC value of the battery itself may be obtained by ampere-hour integration or other methods.
And S220, determining the display SOC value of the battery in each charging stage according to the open-circuit voltage.
The open-circuit voltage of the battery and the SOC value of the battery have a corresponding relation, namely an SOC-OCV curve. Thus, after the open-circuit voltage of the battery is obtained, a corresponding displayed SOC value can be calculated based on the SOC-OCV curve of the battery.
And S230, determining the charging time of the battery in each charging stage according to the displayed SOC value of the battery in each charging stage.
Specifically, the charging time of the battery is consistent with the charging time of the battery cell, so the present embodiment determines the charging time of the battery by finding the charging time of the battery cell.
In one embodiment, the charging time of the battery in each charging phase is determined by the following formula:
Figure BDA0002785262700000101
in the formula: cell _ TimeiThe charging time required for the ith charging stage;
SOCidisplaying the SOC value corresponding to the ith charging stage;
SOCi-1displaying the SOC value corresponding to the i-1 th charging stage;
cap is the rated capacity of the battery cell;
SOH is the state of health value of the battery;
DcChrgCurrMapithe charging current of the battery electric core corresponding to the ith charging stage.
It should be noted that the SOC in the above formulai、SOCi-1、Cap DcChrgCurrMapiThe temperature of the battery cell is a function of the temperature of the battery cell, and the real-time temperature of the battery cell can be obtained through sampling.
The SOH value is directly output by other modules in the battery management system.
And S240, acquiring the current working voltage of the battery.
And S250, determining a current charging stage corresponding to the current working voltage and a previous charging stage adjacent to the current charging stage.
In the present embodiment, because the remaining charging time of the battery needs to be calculated, a previous adjacent stage of the current charging stage is determined in a downward overlapping manner when the remaining charging time is calculated. Namely, the charging stage corresponding to the fully charged battery is used as the first charging stage, and the charging stage adjacent to the current charging stage and located at one side of the first charging stage is used as the previous charging stage of the current charging stage.
And S260, determining the residual charging time of the battery until the previous charging stage according to the current charging stage and the charging time of the battery in each charging stage.
As analyzed above, the present embodiment calculates the remaining charging time of the battery until the previous charging stage by means of downward superposition, specifically, the remaining charging time can be calculated by the following formula:
Figure BDA0002785262700000111
in the formula: ChrgTimeiThe residual charging time corresponding to the ith stage;
Cell_Timejthe charging time for the jth charging phase.
For example, if it is determined that the charging phase corresponding to the current charging voltage is the fifth charging phase, the previous charging phase is the fourth charging phase, and accordingly, i is taken to be 4, and the remaining charging time until the previous charging phase is calculated.
And S270, determining the remaining charging time of the battery according to the remaining charging time of the battery in the previous charging stage and the current working voltage.
Specifically, the current charging stage of the battery can be determined according to the current working voltage, and the charging time corresponding to each charging stage of the battery is determined, so that the total remaining charging time of the battery can be calculated by combining the starting value and the ending value of the charging platform voltage corresponding to the current charging voltage and the remaining charging time of the previous charging stage according to the current working voltage through an interpolation method.
Specifically, the remaining charge time of the battery can be calculated by the following formula:
Figure BDA0002785262700000121
in the formula: ChrgTimeinputIs the remaining charging time corresponding to the current operating voltage;
ChrgTimei-1the residual charging time corresponding to the previous charging stage of the current working voltage;
Cell_Voltinputthe voltage value is the current working voltage;
Cell_Voltithe charging platform voltage value of the current charging stage corresponding to the current working voltage;
Cell_Volti-1the voltage value of the charging platform in the previous charging stage of the current charging stage;
Cell_Timeiis the charging time of the current charging phase.
In the above formula, since the charging platform voltage corresponding to the previous charging stage is related to the charging stage of the battery, before the calculation is performed by using the above formula, the battery management system needs to perform the following determination:
determining whether the current charging stage is a first charging stage;
and if the current charging stage is the first charging stage, using the charging cut-off voltage as the charging platform voltage corresponding to the previous charging stage.
In the embodiment, the corresponding charging stage is determined through the current charging voltage, the remaining charging time corresponding to the previous charging stage cut to the current working voltage is obtained through a downward superposition method, and then the remaining charging time of the battery under the current charging voltage is calculated by using an interpolation method based on the remaining charging time cut to the previous charging stage, the initial value and the final value of the charging platform voltage corresponding to the current charging stage, so that the display SOC value of the battery is obtained in real time according to the charging voltage characteristic of the battery, and then the remaining charging time of the battery is determined in real time, and therefore the problems of inaccurate estimation, jump estimation time and the like of the quick charging remaining charging time caused by factors such as environmental mutation, abnormal charging current and the like are limited.
Optionally, fig. 3 is a flowchart of another battery charging management method according to an embodiment of the present invention, and with reference to fig. 3, the method specifically includes:
and S310, obtaining parameters of the battery cell data table.
In some embodiments, before obtaining the cell data table parameters, the battery management system further needs to set a final error and a single SOC accumulation amount of the iterative function to establish the iterative function.
And S320, judging whether all temperature intervals are traversed or not.
The step is used for solving the display SOC values corresponding to the charging platform voltage points at different temperatures.
And S330, acquiring a display SOC value corresponding to each voltage platform.
Each charging stage corresponds to one voltage platform, and the step is to obtain a display SOC value corresponding to each charging stage.
And S340, calculating the charging time required by each charging stage.
Wherein the charging time between adjacent charging plateau voltages, i.e. the charging time required for each charging phase, can be calculated using equation (2) of the above embodiment by displaying the SOC value.
And S350, calculating whether the charging stage is the first stage.
If the charging stage is the first charging stage, step S360 is performed;
otherwise, the process proceeds to step S370.
And S360, calculating by using the charge cut-off voltage as the initial voltage value of the previous stage.
And S370, calculating by using the voltage value of the previous stage of the charging current spectrum as an initial value.
And S380, calculating the residual charging time of each voltage input point by using an interpolation method.
Specifically, by superimposing the charging time required for each charging phase downward, the remaining charging time at any point in each voltage interval can be found by interpolation.
And S390, smoothing the calculated residual charging time.
Specifically, the obtained remaining charging time curve is subjected to filtering smoothing processing, and a smooth remaining charging time table is calculated, so that the remaining charging time is updated every 10s, and the maximum amplitude of each jump is 1 minute.
Optionally, fig. 4 is a schematic structural diagram of a battery management system according to an embodiment of the present invention, where the battery management system may be used to estimate the remaining charging time of a battery based on the charging voltage of the battery, so as to accurately manage and display the remaining charging time of the battery. Referring to fig. 4, the battery management system 40 includes: the display power amount determination module 410, the charging time determination module 420, the voltage acquisition module 430, and the remaining charging time determination module 440, wherein,
the display electric quantity determining module 410 is configured to determine a display SOC value of the battery in each charging stage according to a charging platform voltage corresponding to each charging stage of the battery and a cell parameter of the battery, where the charging stage of the battery is divided according to a fast charging current spectrum of the battery;
a charging time determining module 420, configured to determine charging time of the battery in each charging phase according to a displayed SOC value of the battery in each charging phase;
a voltage obtaining module 430, configured to obtain a current working voltage of the battery;
a remaining charging time determining module 440, configured to determine the remaining charging time of the battery according to the current working voltage and the charging time of the battery in each charging phase.
Optionally, on the basis of the foregoing technical solution, the display electric quantity determining module 410 includes:
the open-circuit voltage determining unit is used for determining the open-circuit voltage of the battery at each charging stage according to the charging platform voltage and the battery cell parameters of the battery;
and the display SOC value determining unit is used for determining the display SOC value of the battery in each charging stage according to the open-circuit voltage.
Optionally, on the basis of the above technical solution, the open-circuit voltage determining unit is specifically configured to determine the open-circuit voltage of the battery at each charging stage according to the following relationship:
OCVSOC，temp＝USOC，temp+I*DCRtemp，SOH (1)
in the formula: OCVSOC，tempIs open circuit voltage, USOC，tempWorking voltages corresponding to different temperatures and SOC values in a fast charging current spectrum, I is charging current, DCRtemp，SOHFeeding back the internal resistance for the pulses corresponding to different temperatures and SOC values.
Optionally, on the basis of the foregoing technical solution, the charging time determining module 420 is specifically configured to determine the charging time of the battery in each charging phase according to the following formula:
Figure BDA0002785262700000151
in the formula: cell _ TimeiThe charging time required for the ith charging stage;
SOCidisplaying the SOC value corresponding to the ith charging stage;
SOCi-1displaying the SOC value corresponding to the i-1 th charging stage;
cap is the rated capacity of the battery cell;
SOH is the state of health value of the battery;
DcChrgCurrMapithe charging current of the battery electric core corresponding to the ith charging stage.
Optionally, on the basis of the foregoing technical solution, the remaining charging time determining module 440 includes:
the charging stage determining unit is used for determining a current charging stage corresponding to the current working voltage and a previous charging stage adjacent to the current charging stage;
the first residual charging time determining unit is used for determining the residual charging time of the battery until the previous charging stage according to the current charging stage and the charging time of the battery in each charging stage;
and the second residual charging time determining unit is used for determining the residual charging time of the battery according to the residual charging time of the battery until the previous charging stage and the current working voltage.
Optionally, on the basis of the above technical solution, the second remaining charging time determining unit is specifically configured to: the remaining charge time of the battery is determined according to the following formula:
Figure BDA0002785262700000161
in the formula: ChrgTimeinputIs the remaining charging time corresponding to the current operating voltage;
ChrgTimei-1the residual charging time corresponding to the previous charging stage of the current working voltage;
Cell_Voltinputthe voltage value is the current working voltage;
Cell_Voltithe charging platform voltage value of the current charging stage corresponding to the current working voltage;
Cell_Volti-1the voltage value of the charging platform in the previous charging stage of the current charging stage;
Cell_Timeiis the charging time of the current charging phase.
Optionally, on the basis of the above technical solution, the battery management system 40 further includes a smoothing module, where the smoothing module is configured to:
filtering the residual charging time; and the number of the first and second groups,
and updating the residual charging time after the filtering processing according to a preset time interval.
Optionally, on the basis of the above technical solution, the battery management system 40 further includes a confirmation module, where the confirmation module is configured to:
determining whether the current charging stage is a first charging stage; and the number of the first and second groups,
and if the current charging stage is the first charging stage, using the charging cut-off voltage as the charging platform voltage corresponding to the previous charging stage.
The battery management system 40 provided in the embodiment of the present invention may execute the battery charging management method provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. Reference may be made to the description in the method embodiments of the invention for details not explicitly described in this embodiment.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A battery charge management method, comprising:
determining a display SOC value of the battery in each charging stage according to charging platform voltages corresponding to each charging stage of the battery and electric core parameters of the battery, wherein the charging stage of the battery is divided according to a fast charging current spectrum of the battery;
determining the charging time of the battery in each charging stage according to the display SOC value of the battery in each charging stage;
acquiring the current working voltage of the battery;
and determining the residual charging time of the battery according to the current working voltage and the charging time of the battery in each charging stage.
2. The battery charge management method of claim 1, wherein the determining the display SOC value of the battery at each charging stage according to the charging platform voltage and the cell parameter of the battery comprises:
determining the open-circuit voltage of the battery at each charging stage according to the charging platform voltage and the battery core parameters of the battery;
and determining the display SOC value of the battery at each charging stage according to the open-circuit voltage.
3. The battery charge management method of claim 2, wherein the open-circuit voltage of the battery at each charging stage is determined according to the charging platform voltage and the cell parameters of the battery according to the following relationship:
OCVSOC，temp＝USOC，temp+I*DCRtemp，SOH (1)
in the formula: OCVSOC，tempIs open circuit voltage, USOC，tempWorking voltages corresponding to different temperatures and SOC values in a fast charging current spectrum, I is charging current, DCRtemp，SOHFeeding back the internal resistance for the pulses corresponding to different temperatures and SOC values.
4. The battery charge management method according to claim 1, wherein said determining the charging time of the battery in each charging phase according to the displayed SOC value of the battery in each charging phase comprises:
determining the charging time of the battery in each charging stage according to the display SOC value of the battery in each charging stage according to the following formula:
Figure FDA0002785262690000021
in the formula: cell _ TimeiThe charging time required for the ith charging stage;
SOCidisplaying the SOC value corresponding to the ith charging stage;
SOCi-1displaying the SOC value corresponding to the i-1 th charging stage;
cap is the rated capacity of the battery cell;
SOH is the state of health value of the battery;
DcChrgCurrMapithe charging current of the battery electric core corresponding to the ith charging stage.
5. The battery charge management method of claim 1, wherein determining the remaining charge time of the battery based on the current operating voltage and the charge time of the battery in each charge phase comprises:
determining a current charging stage corresponding to the current working voltage and a previous charging stage adjacent to the current charging stage;
determining the residual charging time of the battery until the previous charging stage according to the current charging stage and the charging time of the battery in each charging stage;
and determining the residual charging time of the battery according to the residual charging time of the battery in the previous charging stage and the current working voltage.
6. The battery charge management method of claim 5, wherein said determining the remaining charge time of the battery based on the remaining charge time of the battery since the previous charge phase and the current operating voltage comprises:
determining the remaining charging time of the battery according to the remaining charging time of the battery up to the previous charging stage and the current working voltage according to the following formula:
Figure FDA0002785262690000031
in the formula: ChrgTimeinputIs the remaining charging time corresponding to the current operating voltage;
ChrgTimei-1the residual charging time corresponding to the previous charging stage of the current working voltage is obtained;
Cell_Voltinputthe current working voltage is the voltage value of the current working voltage;
Cell_Voltithe charging platform voltage value of the current charging stage corresponding to the current working voltage;
Cell_Volti-1the charging platform voltage value of the charging stage before the current charging stage;
Cell_Timeithe charging time of the current charging stage.
7. The battery charge management method of claim 1, wherein after said determining the remaining charge time of the battery, the method further comprises:
filtering the residual charging time;
and updating the residual charging time after the filtering processing according to a preset time interval.
8. A battery management system, comprising:
the display electric quantity determining module is used for determining the display SOC value of the battery in each charging stage according to the charging platform voltage corresponding to each charging stage of the battery and the electric core parameter of the battery, wherein the charging stage of the battery is divided according to the fast charging current spectrum of the battery;
the charging time determining module is used for determining the charging time of the battery in each charging stage according to the display SOC value of the battery in each charging stage;
the voltage acquisition module is used for acquiring the current working voltage of the battery;
and the residual charging time determining module is used for determining the residual charging time of the battery according to the current working voltage and the charging time of the battery in each charging stage.
9. The battery management system of claim 8, wherein the display power determination module comprises:
the open-circuit voltage determining unit is used for determining the open-circuit voltage of the battery in each charging stage according to the charging platform voltage and the battery core parameters of the battery;
and the display SOC value determining unit is used for determining the display SOC value of the battery in each charging stage according to the open-circuit voltage.
10. The battery management system of claim 8, wherein the remaining charge time determination module comprises:
a charging stage determining unit, configured to determine a current charging stage corresponding to the current working voltage and a previous charging stage adjacent to the current charging stage;
a first remaining charging time determining unit, configured to determine, according to the current charging stage and charging times of the battery in each charging stage, a remaining charging time of the battery until the previous charging stage;
and the second residual charging time determining unit is used for determining the residual charging time of the battery according to the residual charging time of the battery in the previous charging stage and the current working voltage.
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