CN116323288A - Method and device for determining display state of charge and battery management chip - Google Patents
Method and device for determining display state of charge and battery management chip Download PDFInfo
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- CN116323288A CN116323288A CN202180006742.3A CN202180006742A CN116323288A CN 116323288 A CN116323288 A CN 116323288A CN 202180006742 A CN202180006742 A CN 202180006742A CN 116323288 A CN116323288 A CN 116323288A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/12—Recording operating variables ; Monitoring of operating variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
Abstract
A method, a device and a battery management chip for determining and displaying charge states are provided, and relate to the field of battery management. In the method, the actual voltage of an ith system cell in a target battery pack at the current moment k, the charge cut-off voltage of the ith system cell and the actual voltage of the previous moment k-1 are obtained; determining the display charge state of the ith system cell in the target battery pack in the (n+1) th display period according to the actual voltage of the current moment k, the actual voltage of the previous moment k-1, the charge cut-off voltage, the display charge state of the previous moment k-1 of the target battery pack and the full charge display charge state of the target battery pack; and determining the display charge state of the target battery pack in the n+1th display period according to the display charge states of all system cells in the target battery pack in the n+1th display period. And further, the display charge states of the battery packs of the multiple systems are determined, and the jump situation of the display charge states can be reduced.
Description
The present disclosure relates to the field of battery management, and in particular, to a method and apparatus for determining a display state of charge, and a battery management chip.
When an electronic device powered by a battery is in use, a display interface of the electronic device typically displays a state of charge (SOC) of the battery. The display SOC may be used to indicate the current remaining charge of the battery so that the user charges or discharges the battery.
However, the display SOC often deviates from the actual SOC.
Disclosure of Invention
The invention aims to provide a method and a device for determining a display state of charge and a battery management chip, which are used for improving the accuracy of displaying an SOC.
In a first aspect, an embodiment of the present application provides a method for determining a display state of charge, including:
acquiring the actual voltage of an ith system cell in a target battery pack at a current time k, the charging cut-off voltage of the ith system cell and the actual voltage of a previous time k-1, wherein I is a positive integer and is less than or equal to I, I is the number of types of battery anode materials in the target battery pack, the current time k is any time in a time interval in which the ending time of an nth display period is located, and the previous time k-1 is any time in a time interval in which the ending time of the nth display period is located;
Determining the display charge state of the ith system cell in the target battery pack in the (n+1) th display period according to the actual voltage of the current moment k, the actual voltage of the previous moment k-1, the charge cut-off voltage, the display charge state of the target battery pack at the previous moment k-1 and the full charge display charge state of the target battery pack;
and determining the display charge state of the target battery pack in the n+1th display period according to the display charge states of all system cells in the target battery pack in the n+1th display period.
In the implementation manner, the display charge states of the battery cells of each system in the multi-system battery pack can be calculated respectively, and then the overall display charge state of the target battery pack is determined, so that the influence of the charge states of the battery cells of each system on the overall is considered, and the determined display charge states are more accurate.
In a possible implementation manner, the determining the display charge state of the ith system cell in the target battery pack in the n+1th display period according to the actual voltage of the current time k, the actual voltage of the previous time k-1, the charge cut-off voltage, the display charge state of the previous time k-1 of the target battery pack and the full charge display charge state of the target battery pack includes:
Judging whether the target battery pack is in a charging end state or not;
and if the target battery pack is in a charging end state, determining the display charge state of the ith system cell in the target battery pack in the (n+1) th display period according to the actual voltage of the current moment k, the actual voltage of the previous moment k-1, the charging cut-off voltage, the display charge state of the previous moment k-1 of the target battery pack and the full charge display charge state of the target battery pack.
In the implementation method, the determination of the display charge state by the filtering algorithm can be restarted when the charging terminal is in the charging state, so that the display charge state of the charging terminal is relieved, and the charging terminal jumps to the full-charge display state when the charging terminal is not in the full-charge state.
In one possible embodiment, the determining whether the target battery pack is in the end-of-charge state includes:
judging whether a target vehicle provided with the target battery pack is in a gun inserting charging state or not;
if the target vehicle is in a gun inserting charging state, judging whether a state parameter corresponding to the target battery pack is in a preset interval or not;
and if the state parameter corresponding to the target battery pack is in the preset interval, indicating that the target battery pack is in the state of the charging end.
In a possible implementation manner, the determining whether the state parameter corresponding to the target battery pack is within a preset interval includes:
judging whether the charging current of the target battery pack is smaller than a first preset threshold value or not;
judging whether the maximum cell terminal voltage in the target battery pack is larger than a second preset threshold value or not;
judging whether the display charge state of the target battery pack is larger than a third preset threshold value or not;
and if the charging current of the target battery pack is smaller than a first preset threshold value, the maximum cell terminal voltage in the target battery pack is larger than a second preset threshold value, and the display charge state of the target battery pack is larger than a third preset threshold value, indicating that the state parameter corresponding to the target battery pack is in a preset interval.
In the implementation manner, whether the battery pack is at the tail end or not can be judged through two dimensions of the plugging state of the charging gun and the state parameter of the battery pack, and the accuracy of judging the tail end can be improved. Further, by aiming at different parameters of the battery, different thresholds can be started to realize the judgment of the parameters, the judgment requirement of the battery can be better met, and the accuracy of terminal judgment is realized.
In a possible implementation manner, the determining the display charge state of the ith system cell in the target battery pack in the n+1th display period according to the actual voltage of the current time k, the actual voltage of the previous time k-1, the charge cut-off voltage, the display charge state of the previous time k-1 of the target battery pack and the full charge display charge state of the target battery pack includes:
and determining the display charge state of the ith system cell in the target battery pack in the (n+1) th display period according to a preset filtering algorithm, the actual voltage of the current moment k, the actual voltage of the previous moment k-1, the charge cut-off voltage, the display charge state of the target battery pack at the previous moment k-1 and the full charge display charge state of the target battery pack.
In one possible implementation manner, the display charge state of the ith system cell of the target battery pack in the (n+1) th display period is determined according to the following formula:
SOC(n+1) i ＝SOC(n) i +(F(V(n+1) i )-F(Vn i ))*(SOC(end)-SOC(n) i )/(F(Vend)-F(Vn i ))；
wherein SOC (n+1) i Representing the display charge state of an ith system cell in the target battery pack in an (n+1) th display period; SOC (n) i Representing the display charge state of an ith system cell in the target battery pack in an nth display period; SOCend represents the full charge display state of charge of the target battery pack; f () represents a preset filtering algorithm; f (V (n+1) i ) Representing the fitting voltage of an ith system cell in the target battery pack in an (n+1) th display period; f (V (n+1) i ) Representing the fitting voltage of an ith system cell in the target battery pack in an (n+1) th display period; f (Vend) represents a fitted cutoff voltage of the target battery pack; v (n+1) i Representing the actual voltage of an ith system cell in the target battery pack at the starting time of an (n+1) th display period; vn i Representing the actual voltage of an ith system cell in the target battery pack at the starting time of an nth display period; vend represents the charge cutoff voltage of the target battery pack.
In the above embodiment, when the display charge state of the n+1th display period is determined, a filtering algorithm may be preset to implement correction of the display SOC, and the display charge state observed by the user in the n+1th display period is more accurate.
In a possible implementation manner, the determining the display charge state of the target battery pack in the n+1th display period according to the display charge states of all system battery cells in the target battery pack in the n+1th display period includes:
determining the maximum display charge state in the target battery pack and the minimum display charge state in the target battery pack according to the display charge states of all system cells in the target battery pack in the n+1th display period;
And determining the display charge state of the target battery pack in the (n+1) th period according to the maximum display charge state and the minimum display charge state.
In the above implementation manner, the display state of charge of the whole target battery pack may be calculated using only the minimum display state of charge and the maximum display state of charge, so that the calculation amount may be smaller. In addition, the minimum display charge state and the maximum display charge state are taken into calculation, so that the calculated display charge state can be more approximate to the actual charge state of the target battery pack.
In one possible embodiment, the display state of charge of the target battery pack at the n+1th cycle is determined by the following formula:
PackDispSOC(n+1)＝minDispSOC(n+1)/(1-(maxDispSOC(n+1)-minDispSOC(n+1)))*100％；
wherein, packDispSOC (n+1) is the display charge state of the target battery pack in the (n+1) th display period; minDispSOC is the minimum display state of charge in the target battery pack; maxdispssoc is the maximum displayed state of charge in the target battery pack.
In a possible implementation manner, the determining the display charge state of the target battery pack in the n+1th period according to the maximum display charge state and the minimum display charge state includes:
When the maximum display charge state is greater than a first specified value, determining the maximum display charge state as the display charge state of the target battery pack in the n+1th period;
and when the minimum display charge state is larger than a second designated value, determining the minimum display charge state as the display charge state of the target battery pack in the n+1th period.
In a possible implementation manner, the determining the display charge state of the target battery pack in the n+1th display period according to the display charge states of all system battery cells in the target battery pack in the n+1th display period includes:
and determining the display charge state of the target battery pack in the n+1th period according to the display charge states of all system cells in the target battery pack in the n+1th period and the corresponding credibility values of all system cells.
In the implementation manner, the influence of the battery cells of each system on the whole battery pack can be combined, the reliability value is added to calculate the display charge state of the whole battery pack, and the determined display charge state can be more accurate.
In a possible implementation manner, the obtaining the actual voltage of the ith system cell at the current time k, the charge cut-off voltage of the ith system cell, and the actual voltage of the previous time k-1 in the target battery pack includes:
Acquiring charging state data of the target battery pack recorded by a battery management system, wherein the charging state data is a current actual charging state or a charging mark;
and if the charge state data is a specified value, acquiring the actual voltage of the ith system cell in the target battery pack at the current time k, the charge cut-off voltage of the ith system cell and the actual voltage of the previous time k-1.
In the implementation manner, whether the method for determining the display state of charge is started or not is determined through the data recorded by the battery management system, and the determination manner of the display state of charge can be used in a targeted manner, so that the determination of the display state of charge can be more accurately realized.
In a possible implementation manner, the obtaining the actual voltage of the ith system cell at the current time k, the charge cut-off voltage of the ith system cell, and the actual voltage of the previous time k-1 in the target battery pack includes:
judging whether the maximum cell terminal voltage in the actual voltage at the current moment k is smaller than a fourth preset threshold value or not;
and if the maximum cell terminal voltage in the actual voltage at the current moment k is smaller than a fourth preset threshold value, acquiring the actual voltage of the ith system cell in the target battery pack at the current moment k, the charge cut-off voltage of the ith system cell and the actual voltage at the previous moment k-1.
In the implementation manner, the state of the voltage of the battery is determined first, and the method for determining the display state of charge is started to determine the display state of charge under the condition that the state of the voltage meets the requirement, so that the determination of the display state of charge can be used in a targeted manner, and the determination of the display state of charge can be realized more accurately.
In a second aspect, an embodiment of the present application provides an apparatus for determining a display state of charge, including:
the device comprises an acquisition module, a display module and a display module, wherein the acquisition module is used for acquiring the actual voltage of an ith system cell in a target battery pack at the current moment k, the charge cut-off voltage of the ith system cell and the actual voltage of a previous moment k-1, wherein I is a positive integer and is less than or equal to I, I is the type number of battery positive electrode materials in the target battery pack, the current moment k is any moment in a time interval in which the ending moment of an nth display period is located, and the previous moment k-1 is any moment in a time interval in which the ending moment of the nth display period is located;
the first determining module is configured to determine a display charge state of the ith system cell in the target battery pack in an (n+1) th display period according to an actual voltage of the current time k, an actual voltage of the previous time k-1, the charge cut-off voltage, a display charge state of the target battery pack at the previous time k-1 and a full charge display charge state of the target battery pack;
And the second determining module is used for determining the display charge state of the target battery pack in the (n+1) th display period according to the display charge states of all system battery cells in the target battery pack in the (n+1) th display period.
In a third aspect, embodiments of the present application further provide a battery management chip, including: comprising a processor and a memory storing computer readable instructions which, when executed by the processor, perform the method described above.
In a fourth aspect, embodiments of the present application further provide an electronic device, including a processor and a memory, where the memory stores computer readable instructions that, when executed by the processor, perform the method described above.
In a fifth aspect, embodiments of the present application also provide a readable storage medium having stored thereon a computer program which, when executed by a processor, performs the above-described method.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart illustrating a method for determining a display state of charge according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of some steps for determining a display state of charge provided in an embodiment of the present application;
FIG. 2 is a flowchart of another partial step of determining a display state of charge provided by an embodiment of the present application;
FIG. 4 is a functional block diagram of an apparatus for determining a display state of charge according to an embodiment of the present application;
fig. 5 is a block schematic diagram of an electronic device according to an embodiment of the present application.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application.
Interpretation of technical terms:
state of charge: state of charge (SOC), the ratio of the remaining capacity of the battery after a period of use or long-term rest to the capacity of its fully charged state.
Displaying the state of charge: the state of charge of the battery pack is displayed on a display screen of the electronic device.
Actual state of charge: the true state of charge of the battery pack.
Terminal voltage: the voltage values of the two ends of the battery core are collected by the power management system.
Currently, the way to correct the display state of charge is: acquiring a plurality of battery working parameters (such as current, temperature, terminal voltage and the like) of a battery, inputting the battery working parameters into a preset open-circuit voltage calculation model to calculate the open-circuit voltage of the battery, and judging whether the state of charge is required to be calibrated according to the open-circuit voltage value; if so, determining a target calibration coefficient of the battery under the open-circuit voltage value and the display state of charge according to a preset calibration table; and calibrating the display charge state according to the target calibration coefficient. However, the open circuit voltage value obtained by calculation according to the open circuit voltage calculation model is limited by the model error and the battery core characteristics of the LFP battery core, the calculated real state of charge is not accurate enough, the corrected display state of charge is also inaccurate, the phenomena of uneven calculation speed, jump and the like of the display state of charge can occur, and the use experience of a user is affected.
The above prior art solutions have all the drawbacks that the inventors have obtained after practice and careful study, and thus the discovery process of the above problems and the solutions presented in the following embodiments of the present invention for the above problems should be all contributions to the invention by the inventors during the inventive process.
The application provides a method for determining a display state of charge, which is applied to electronic equipment needing to display the state of charge to a user. Specifically, a battery management system (Battery Management System, abbreviated as BMS) may be disposed in the electronic device, and the method for determining the display SOC of the battery pack provided in the present application may be specifically applied to the BMS. The electronic device may be, but is not limited to, an electronic device powered by a battery pack, such as a smart phone, a tablet computer, an electric automobile, etc.
As shown in fig. 1, a method for determining a display state of charge according to an embodiment of the present application may include the following steps.
Wherein I is a positive integer and is less than or equal to I, I is the number of types of battery positive electrode materials in the target battery pack, the current time k is any time in a time interval in which the end time of the nth display period is located, and the previous time k-1 is any time in a time interval in which the end time of the nth-1 display period is located.
In this embodiment, the target battery pack may include multiple cells of different systems, where the positive electrode material of each cell of the system is different.
The current time k is any time in a time interval in which the end time of the nth display period is located, and the previous time k-1 is any time in a time interval in which the end time of the nth display period is located.
The current time k may be, for example, the end time of the nth display period or a time before the end time of the nth display period.
Illustratively, the time interval in which the end time of the nth display period is located is a time interval shorter than the display period. For example, the time interval may be one fifth of the display period, one tenth of the display period, one seventh of the display period, one fifteen of the display period, and so on.
The current time k may be located at a critical time of two adjacent sampling periods, or may be located in any one sampling period.
The power management system typically records parameters associated with the battery pack, such as charge and discharge state, actual SOC, display SOC, actual voltage, etc., for each acquisition time period within a fixed time period. Alternatively, the time length of each parameter acquisition period may be the same or different; the length of the display period may be the same as or different from the length of the sampling period.
As a possible implementation manner, the battery management system acquires and records the actual voltage in each sampling period; the display SOC in each display period is acquired and recorded in the display period.
The sampling period may be a fixed value during the active use of the battery pack, and the display period may be a fixed value during the active use of the battery pack, depending on specific requirements. Currently, if there are other demands, the sampling period may take different values at different life stages of the battery pack, and the display period may take different values at different life stages of the battery pack.
Optionally, the display state of charge of the ith system cell in the target battery pack in the n+1th display period may be determined according to a preset filtering algorithm, the actual voltage of the current time k, the actual voltage of the previous time k-1, the charge cut-off voltage, the display state of charge of the previous time k-1 of the target battery pack, and the full charge display state of charge of the target battery pack.
Illustratively, after the preset filtering algorithm, the difference between the fitting voltages of two adjacent display periods used for calculating the display charge state of the target battery pack in the (n+1) th display period is larger. The fitting voltage may be less than the actual voltage or greater than the actual voltage.
In one example, the actual voltage and the fitted voltage can be as shown in table 1 below, after the preset filtering algorithm.
TABLE 1
| Actual voltage (V) | Fitting Voltage (FV) |
| V0:3.45V | 3 |
| V0+(Vend-V0)/5:3.49V | 4.09 |
| V0+2*(Vend-V0)/5：3.53V | 4.61 |
| V0+4*(Vend-V0)/5:3.61V | 5.19 |
| Vend:3.65V | 5.39 |
Wherein the values of the actual voltage and the fitted voltage at five moments are shown in table 1. V0 represents an actual voltage at an initial time of using the method of determining the display state of charge in the present embodiment; vend represents the actual voltage of the target battery pack in the full charge state. For example, the method of determining the display state of charge in the present embodiment may be used to determine the display state of charge at the charging end, and then the V0 represents the actual voltage at the point of entering the charging end.
And 130, determining the display charge state of the target battery pack in the n+1th display period according to the display charge states of all system cells in the target battery pack in the n+1th display period.
As one possible implementation, the electronic device may acquire the display SOC by: the electronic device records and displays the SOC to the memory before each power-down. At the initial time of powering up the electronic device, the display SOC recorded before the last powering down of the memory may be read as the display SOC of the first display period.
As one possible implementation manner, it may be determined whether the target battery pack is in the charge end state, if the target battery pack is in the charge end state, the display charge state of the ith system cell in the target battery pack in the n+1th display period is determined according to the actual voltage of the current time k, the actual voltage of the previous time k-1, the charge cut-off voltage, the display charge state of the previous time k-1 of the target battery pack and the full charge display charge state of the target battery pack.
As one possible implementation, whether the target battery pack is in the end-of-charge state may be determined by whether the target vehicle in which the target battery pack is located is connected to the gun-in-charge state of the charging gun, and the value of the state parameter of the target battery pack.
The state parameters corresponding to the target battery pack can be judged whether to be in a preset interval or not, and if the target vehicle is in the gun inserting charging state and the state parameters corresponding to the target battery pack are in the preset interval, the state that the target battery pack is in the charging end state is indicated.
Illustratively, the state parameters of the target battery pack may include: charging current, charging voltage, display state of charge, etc. The determination of different parameters may be based on different parameter thresholds.
Alternatively, it may be determined whether the state parameter corresponding to the target battery pack is within the preset interval through the flow shown in fig. 2.
As the battery pack is charged, the charging current gradually decreases. Therefore, the smaller the charging current, the larger the state of charge of the target battery pack can be represented. Therefore, the first preset threshold value can be determined by the charge start current and the charge end current.
Illustratively, the charge start current is denoted as Istart when the target battery pack just starts charging, and the charge end current is denoted as Iend when the target battery pack is satisfied.
The first preset threshold may be expressed as: thi=istart- (Istart-Iend) ×p1. Wherein, the p1 may be a selected critical ratio. The value of p1 can be set according to the requirement, for example, the value of p1 can be 96%, 89%, 85%, 80% etc.
Alternatively, the first preset threshold may also be determined by a charging termination current.
The first preset threshold may be expressed as: thi=iend (1+p2). Wherein the p2 may be a selected critical ratio. The value of p2 can be set according to the requirement, for example, the value of p2 can be 5%, 8%, 10%, 7% etc.
Since the voltage of the battery in the target battery pack gradually increases during the process of charging the battery pack. Thus, the greater the voltage of the battery, the greater the state of charge of the target battery pack can be represented. Therefore, the second preset threshold value can be determined by the initial voltage of the battery at the start of charging of the battery and the battery end voltage at the stop of charging.
Illustratively, the starting voltage of the battery is denoted as Vstart when the target battery pack begins to charge, and the ending voltage of the battery is denoted as Vend when the target battery pack is satisfied.
The second preset threshold may be expressed as: thv=vstart+ (Vstart-Vend) p3. Wherein, the p3 may be a selected critical ratio. The value of p3 can be set as desired, for example, the value of p3 can be 95%, 87%, 85%, 80% equivalent.
Alternatively, the second preset threshold may be determined by a battery end voltage at the time of charge cutoff.
The second preset threshold may be expressed as: thv=vend×p4. Wherein p4 may be a selected critical ratio. The value of p4 can be set as desired, for example, the value of p4 can be 95%, 87%, 85%, 82% equivalent.
The displayed state of charge may be used to characterize the current charge of the target battery pack, for example. The value of the third preset threshold can be determined according to the display charge state of the full charge state, and the value of the third preset threshold can also be determined according to the display charge state in the initial charge state and the display charge state of the full charge state.
For example, when the target battery pack starts to be charged, the full charge display state of charge in which the target battery pack is in the no-charge state is denoted as SOCzero, and the full charge display state of charge in which the target battery pack is in the full charge state is denoted as socnd.
The third preset threshold may be expressed as: thsoc=soczero+ (SOCzero-SOCend) ×p5. Wherein, the p5 may be a selected critical ratio. The value of p5 can be set as desired, for example, the value of p5 can be 95%, 87%, 85%, 80% equivalent.
The third preset threshold may also be expressed as: thsoc=socend×p6. Wherein the p6 may be a selected critical ratio. The value of p6 can be set as desired, for example, the value of p6 can be 95%, 87%, 85%, 80% equivalent.
And if the charging current of the target battery pack is smaller than the first preset threshold value, the maximum cell terminal voltage in the target battery pack is larger than the second preset threshold value, and the display charge state of the target battery pack is larger than the third preset threshold value, the state parameter corresponding to the target battery pack is indicated to be in the preset interval.
Based on the state parameters of the multi-dimensional target battery pack, the state of the target battery pack is determined, and the state of the target battery pack can be determined more accurately.
Alternatively, the display state of charge of the target battery pack at the n+1th display period may be determined by the following formula:
SOC(n+1) i ＝SOC(n) i +(F(V(n+1) i )-F(Vn i ))*(SOC(end)-SOC(n) i )/(F(Vend)-F(Vn i ))；
wherein SOC (n+1) i Representing the display charge state of an ith system cell in the target battery pack in an (n+1) th display period; SOC (n) i Representing the display charge state of an ith system cell in the target battery pack in an nth display period; SOCend represents the full charge display state of charge of the target battery pack; f () represents a preset filtering algorithm; f (V (n+1) i ) Representing the fitting voltage of an ith system cell in the target battery pack in the (n+1) th display period; f (V (n+1) i ) Representing the fitting voltage of an ith system cell in the target battery pack in the (n+1) th display period; f (Vend) represents the fitted cutoff voltage of the target battery pack; v (n+1) i Representing the actual voltage of the ith system cell in the target battery pack at the beginning time of the (n+1) th display period; vn i Representing the actual voltage of the ith system cell in the target battery pack at the starting time of the nth display period; vend represents the charge cutoff voltage of the target battery pack.
In the above formula, the actual voltage is subjected to a preset filtering algorithm to obtain a fitting voltage, so that (F (V (n+1)) i )-F(Vn i ))/(F(Vend)-F(Vn i ) A progressively increasing value, further based on the value of (F (V (n+1)) i )-F(Vn i ))/(F(Vend)-F(Vn i ) The determined change of the adjacent two display charge states to better determine the gradually changing display charge states.
Wherein F (V (n+1) is caused by the action of a preset filtering algorithm i ) And F (Vn) i ) The difference of F (V (n+1)) becomes larger i ) And F (Vn) i ) The difference of (2) also becomes larger, canThe change of the charge states of the adjacent two display periods is more highlighted so as to better represent the charge states of each display period, thereby reducing the jump situation of the display charge states.
In an alternative embodiment, step 130 may determine the display state of charge of the target battery pack at the n+1 cycle by the following steps, as shown in fig. 3.
For example, the values of the display states of charge of the respective system cells calculated in step 120 may be compared, and the minimum display state of charge and the maximum display state of charge of all the system cells may be screened out.
In an alternative implementation, the display state of charge of the target battery pack at the n+1 cycle may be determined by the following equation:
PackDispSOC(n+1)＝minDispSOC(n+1)/(1-(maxDispSOC(n+1)-minDispSOC(n+1)))*100％；
wherein, packDispSOC (n+1) is the display charge state of the target battery pack in the (n+1) th display period; mindistoc is the minimum display state of charge in the target battery pack; minDispSOC (n+1) is the minimum display state of charge in the target battery pack at the n+1th display cycle; maxdispssoc is the maximum display state of charge in the target battery pack; maxdispoc (n+1) is the minimum display state of charge in the target battery pack at the n+1th display period.
In an alternative implementation, when the maximum display state of charge is greater than a first specified value, the maximum display state of charge is determined to be the display state of charge of the target battery pack at the n+1 cycle.
The first specified value may be set as desired.
Alternatively, the first value may be a numerical value of a range defined by a median value of the value intervals of the state of charge. For example, the intermediate value defines a range of (45%, 65%), then the first specified value may be 45%, 50%, 60%, 65% equivalent.
Alternatively, the first value may be a numerical value of a range defined by a larger value of the value interval of the state of charge. For example, the larger value may be 80%, the larger value defines a range of (70%, 81%), and the first specified value may be 70%, 73%, 75%, 81% equivalent.
In an alternative implementation, when the minimum display state of charge is greater than a second specified value, the minimum display state of charge is determined to be the display state of charge of the target battery pack at the n+1 cycle
The second specified value may be set as desired.
Alternatively, the second value may be a value of a range defined by smaller values of the value interval of the state of charge. For example, the smaller value may be 20%, and the larger value defines a range of (15%, 25%), then the first specified value may be 15%, 18%, 20%, 25% equivalent.
In an optional implementation manner, according to the display charge states of all system cells in the target battery pack in the n+1th display period and the reliability values corresponding to the system cells, the display charge states of the target battery pack in the n+1th display period are determined.
The reliability values of the battery cells of each system can be the same or different.
Illustratively, if the reliability values of the battery cells of the respective systems are the same, the display charge state of the target battery pack in the n+1th period may be expressed as:
PackDispSOC(n+1)＝Σ i DSOC(n+1) i /I；
wherein the value range of I is 1 to I, and I is the number of types of battery anode materials in the target battery pack;
PackDispSOC (n+1) is the display state of charge of the target battery pack at the n+1th display period;
DSOC(n+1) i the display charge state of the ith system cell in the (n+1) th display period.
Illustratively, if the reliability values of the battery cells of the respective systems are the same, the display charge state of the target battery pack in the n+1th period may be expressed as:
PackDispSOC(n+1)＝Σ i K i *DSOC(n+1) i ；
wherein the value range of I is 1 to I, and I is the number of types of battery anode materials in the target battery pack; packDispSOC (n+1) is the display state of charge of the target battery pack at the n+1th display period; k (K) i The reliability value of the ith system cell.
Optionally, the I term confidence value K i The sum may be equal to one.
The reliability value of each system cell can be determined according to the display charge state distribution of each system cell in the (n+1) th display period.
Illustratively, the larger the confidence value of the architecture cell corresponding to the display state of charge with the smaller the difference in the average display state of charge, the smaller the confidence value of the architecture cell corresponding to the display state of charge with the larger the difference in the average display state of charge. Wherein the average display state of charge represents an average of the display states of charge of the nth display period of the I term.
For example, |A1-DSOC (n+1) i |>|A1-DSOC(n+1) j I, then K i Less than K j 。
Wherein A1 is the average state of charge of DSOC (n+1) i The charge state is displayed for the ith system cell in the (n+1) th display period; DSOC (n+1) j The display charge state of the jth system cell in the (n+1) th display period is shown.
For example, the display charge state of the nth display period of the I term system battery cell may be divided into a plurality of numerical intervals, and the reliability value of the system battery cell is determined according to the number of the display charge states of the I term system battery cell in the nth display period falling into the numerical intervals.
For example, the range of values for the display state of charge for the nth display period of item I of the I architecture cell is 42% to 54%. Then 42% to 54% can be divided into three numerical intervals of: the values of [42%,46% ], (46%, 50% ], (50%, 54% ], I are 10, the number of I system cells in the [42%,46% ] section is 7,I system cells in the display charge state of the nth display period (46%, 50% ] section is 1, and the number of I system cells in the (50%, 54% ] section is 2 in the display charge state of the nth display period.
In the above example, the reliability value of the system cell in which the display state of charge of the I-term system cell in the nth display period falls within the numerical value interval [42%,46% ] may be set to the maximum value, the reliability value of the system cell in which the display state of charge of the I-term system cell in the nth display period falls within the numerical value interval (46%, 50% ] may be set to the minimum value, and the reliability value of the system cell in which the display state of charge of the I-term system cell in the nth display period falls within the numerical value interval (46%, 50% ] may be set to the next largest value.
In an alternative embodiment, step 130 may determine the display state of charge of the target battery pack during the n+1 cycle by the following steps.
And determining the second largest display charge state in the target battery pack and the second small display charge state in the target battery pack according to the display charge states of all system cells in the target battery pack in the n+1th display period. And then, determining the display charge state of the target battery pack in the n+1th period according to the second large display charge state and the second small display charge state.
In this embodiment, before step 110, the state of charge of the target battery pack may be further determined, and when the state of charge of the target battery pack satisfies the condition, the methods of step 110, step 120 and step 130 are used to determine the display state of charge. Further, when the state of charge of the target battery pack does not satisfy the condition, the determination flow of displaying the state of charge may be ended.
In a possible implementation manner, the method for determining the display state of charge in the embodiment of the application may determine whether the current battery pack needs to be started or ended through data recorded by the battery management system, so as to determine the display state of charge. The battery management system may record the state of charge data of the target battery pack before performing step 110, and steps 120 and 130. And if the currently recorded charge state data in the battery management system is a specified value, acquiring the actual voltage of the current time k of the target battery pack, the charge cut-off voltage of the target battery pack and the actual voltage of the previous time k-1.
The state of charge data is illustratively the current actual state of charge or charge flag.
When the state of charge data is the current actual state of charge, the specified value may be a smaller value than the full state of charge at the full state of charge. When the current actual state of charge recorded currently in the battery management system is a value smaller than the value of the full charge state in the full charge state, executing step 110, step 120 and step 130 again to determine the display state of charge of the target battery pack; when the current actual state of charge currently recorded in the battery management system is the full state of charge, the determination of the display state of charge may be stopped, the display state of charge of the target battery pack may be determined to be the full state of charge, and the execution of steps 110, 120, and 130 may be ended.
For example, the charge flag may include a first value indicating that the target battery pack is in an unfilled state and a second value indicating that the target battery pack is in a filled state. For example, the first value may be 0 and the second value may be 1. When the state of charge data is the current actual state of charge, the specified value may then be a first value.
When the currently recorded charge flag in the battery management system is a first value, then executing step 110, step 120 and step 130 to determine the display state of charge of the target battery pack; when the currently recorded charge flag in the battery management system is the second value, the determination of the display state of charge may be stopped, the display state of charge of the target battery pack may be determined to be full-charged, and the execution of steps 110, 120, and 130 may be ended.
In this embodiment, before step 110, the state parameter of the target battery pack embodiment may be further determined, and when the state parameter of the target battery pack meets the condition, the methods of step 110, step 120 and step 130 are used to determine the display state of charge. Further, when the state parameter of the target battery pack does not satisfy the condition, the determination flow of displaying the state of charge may be ended.
In a possible implementation manner, the method for determining the display state of charge in the embodiment of the application may determine whether the current battery pack needs to be started or ended by acquiring the acquired state parameters of the target battery pack, so as to determine the display state of charge.
For example, it may be determined whether the maximum cell terminal voltage in the actual voltage at the current time k is smaller than a fourth preset threshold, and if the maximum cell terminal voltage in the actual voltage at the current time k is smaller than the fourth preset threshold, the actual voltage at the current time k of the target battery pack, the charge cutoff voltage of the target battery pack, and the actual voltage at the previous time k-1 are obtained.
The fourth preset threshold may be a charge cutoff voltage of the target battery pack.
The method for determining the display state of charge of the target battery pack can reduce the jump of the display state of charge from a smaller display state of charge to a display state of charge value with a larger difference caused by small difference between actual voltages, and improve the accuracy of the display state of charge.
Referring to fig. 4, the present application further provides a device for determining a display state of charge, which is applied to an electronic device powered by a battery pack under an operating state. Specifically, the electronic device includes a battery management system (Battery Management System, abbreviated as BMS), and the display SOC determination method of the battery pack described above may be specifically applied to the BMS. It should be noted that, the basic principle and the technical effects of the device for determining and displaying the state of charge provided in the embodiment of the present application are the same as those of the above embodiment, and for brevity, reference may be made to the corresponding content in the above embodiment for the part of the present embodiment that is not mentioned. The apparatus for determining a display state of charge comprises: an acquisition module 410, a first determination module 420, and a second determination module 430.
An obtaining module 410, configured to obtain an actual voltage of an ith system cell in a target battery pack at a current time k, a charging cut-off voltage of the ith system cell, and an actual voltage of a previous time k-1, where I is a positive integer and is less than or equal to I, I is a number of types of battery positive electrode materials in the target battery pack, the current time k is any time in a time interval in which an end time of an nth display period is located, and the previous time k-1 is any time in a time interval in which an end time of the nth-1 display period is located;
a first determining module 420, configured to determine a display charge state of the ith system cell in the target battery pack in an n+1th display period according to the actual voltage at the current time k, the actual voltage at the previous time k-1, the charge cutoff voltage, the display charge state of the target battery pack at the previous time k-1, and the full charge display charge state of the target battery pack;
the second determining module 430 is configured to determine the display state of charge of the target battery pack in the n+1th display period according to the display state of charge of all the system battery cells in the target battery pack in the n+1th display period.
In one possible design, the first determining module 420 includes: a state judgment unit and a state determination unit.
A state judgment unit for judging whether the target battery pack is in a charge end state;
and the state determining unit is used for determining the display charge state of the ith system cell in the target battery pack in the (n+1) th display period according to the actual voltage of the current moment k, the actual voltage of the previous moment k-1, the charge cut-off voltage, the display charge state of the previous moment k-1 of the target battery pack and the full charge display charge state of the target battery pack if the target battery pack is in the charge end state.
In one possible embodiment, the state determining unit is configured to:
judging whether a target vehicle provided with the target battery pack is in a gun inserting charging state or not;
if the target vehicle is in a gun inserting charging state, judging whether a state parameter corresponding to the target battery pack is in a preset interval or not;
and if the state parameter corresponding to the target battery pack is in the preset interval, indicating that the target battery pack is in the state of the charging end.
In one possible embodiment, the state determining unit is configured to:
judging whether the charging current of the target battery pack is smaller than a first preset threshold value or not;
judging whether the maximum cell terminal voltage in the target battery pack is greater than a second preset threshold value;
Judging whether the display charge state of the target battery pack is larger than a third preset threshold value or not;
if the charging current of the target battery pack is smaller than the first preset threshold, the maximum cell terminal voltage in the target battery pack is larger than the second preset threshold, and the display charge state of the target battery pack is larger than the third preset threshold, the state parameter corresponding to the target battery pack is indicated to be in the preset interval.
In one possible embodiment, the first determining module 420 is configured to:
and determining the display charge state of the ith system cell in the target battery pack in the (n+1) th display period according to a preset filtering algorithm, the actual voltage of the current moment k, the actual voltage of the previous moment k-1, the charge cut-off voltage, the display charge state of the target battery pack at the previous moment k-1 and the full charge display charge state of the target battery pack.
In one possible design, the display charge state of the ith system cell of the target battery pack in the (n+1) th display period is determined according to the following formula:
SOC(n+1) i ＝SOC(n) i +(F(V(n+1) i )-F(Vn i ))*(SOC(end)-SOC(n) i )/(F(Vend)-F(Vn i ))；
wherein SOC (n+1) i Representing the display charge state of an ith system cell in the target battery pack in an (n+1) th display period; SOC (n) i Representing the display charge state of an ith system cell in the target battery pack in an nth display period; SOCend represents the full charge display state of charge of the target battery pack; f () represents a preset filtering algorithm; f (V (n+1) i ) Representing the fitting voltage of an ith system cell in the target battery pack in the (n+1) th display period; f (V (n+1) i ) Representing the fitting voltage of an ith system cell in the target battery pack in the (n+1) th display period; f (Vend) represents the fitted cutoff voltage of the target battery pack; v (n+1) i Representing the actual voltage of the ith system cell in the target battery pack at the beginning time of the (n+1) th display period; vn i Representing the actual voltage of the ith system cell in the target battery pack at the starting time of the nth display period; vend represents the charge cutoff voltage of the target battery pack.
In one possible embodiment, the second determining module 430 is configured to:
determining the maximum display charge state in the target battery pack and the minimum display charge state in the target battery pack according to the display charge states of all system cells in the target battery pack in the n+1th display period;
and determining the display charge state of the target battery pack in the n+1th period according to the maximum display charge state and the minimum display charge state.
In one possible embodiment, the display state of charge of the target battery pack in the n+1th cycle is determined by the following formula:
PackDispSOC(n+1)＝minDispSOC(n+1)/(1-(maxDispSOC(n+1)-minDispSOC(n+1)))*100％；
wherein, packDispSOC (n+1) is the display charge state of the target battery pack in the (n+1) th display period; mindistoc is the minimum display state of charge in the target battery pack; maxdispssoc is the maximum displayed state of charge in the target battery pack.
In one possible embodiment, the second determining module 430 is configured to:
when the maximum display charge state is greater than a first specified value, determining the maximum display charge state as the display charge state of the target battery pack in the n+1th period;
and when the minimum display charge state is larger than a second designated value, determining the minimum display charge state as the display charge state of the target battery pack in the n+1th period.
In one possible embodiment, the second determining module 430 is configured to:
and determining the display charge state of the target battery pack in the n+1th period according to the display charge states of all the system battery cells in the target battery pack in the n+1th period and the corresponding reliability values of all the system battery cells.
In one possible design, the obtaining module 410 is configured to:
Acquiring charging state data of the target battery pack recorded by a battery management system, wherein the charging state data is a current actual charging state or a charging mark;
and if the charge state data is a specified value, acquiring the actual voltage of the ith system cell in the target battery pack at the current time k, the charge cut-off voltage of the ith system cell and the actual voltage of the previous time k-1.
In one possible design, the obtaining module 410 is configured to:
judging whether the maximum cell terminal voltage in the actual voltage at the current moment k is smaller than a fourth preset threshold value;
if the maximum cell terminal voltage in the actual voltage at the current moment k is smaller than a fourth preset threshold value, acquiring the actual voltage of the ith system cell in the target battery pack at the current moment k, the charge cut-off voltage of the ith system cell and the actual voltage at the previous moment k-1.
In addition, the application also provides a battery management chip, which comprises: comprising a processor and a memory storing computer readable instructions which, when executed by the processor, perform a method of determining a display state of charge as in the above-described embodiments of the present application.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an electronic device for performing a method for determining a display state of charge according to an embodiment of the present application, where the electronic device may include: at least one processor 510, such as a CPU, at least one communication interface 520, at least one memory 530, and at least one communication bus 540. Wherein the communication bus 540 is used to enable direct connection communication for these components. The communication interface 520 of the device in the embodiment of the present application is used to perform signaling or data communication with other node devices. The memory 530 may be a high-speed RAM memory or a nonvolatile memory (non-volatile memory), such as at least one disk memory. Memory 530 may also optionally be at least one storage device located remotely from the aforementioned processor. The memory 530 has stored therein computer readable instructions which, when executed by the processor 510, perform the method processes described above in fig. 1.
It will be appreciated that the configuration shown in fig. 4 is merely illustrative, and that the electronic device may also include more or fewer components than shown in fig. 4, or have a different configuration than shown in fig. 4. The components shown in fig. 4 may be implemented in hardware, software, or a combination thereof.
The apparatus may be a module, a program segment, or code on an electronic device. It should be understood that the apparatus corresponds to the embodiment of the method of fig. 1 described above, and is capable of performing the steps involved in the embodiment of the method of fig. 1, and specific functions of the apparatus may be referred to in the foregoing description, and detailed descriptions thereof are omitted herein as appropriate to avoid redundancy.
It should be noted that, for convenience and brevity, a person skilled in the art will clearly understand that, for the specific working procedure of the system and apparatus described above, reference may be made to the corresponding procedure in the foregoing method embodiment, and the description will not be repeated here.
The present embodiment provides a readable storage medium having stored thereon a computer program which, when executed by a processor, performs a method process performed by an electronic device in the method embodiment shown in fig. 1.
The present embodiment discloses a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the methods provided by the above-described method embodiments, for example, comprising: acquiring the actual voltage of the current moment k of the target battery pack, the charging cut-off voltage of the target battery pack and the actual voltage of the previous moment k-1, wherein the current moment k is any moment in a time interval in which the end moment of the nth display period is positioned, and the previous moment k-1 is any moment in a time interval in which the end moment of the nth display period is positioned; and determining the display charge state of the target battery pack in the (n+1) th display period according to the actual voltage of the current moment k, the actual voltage of the previous moment k-1, the charge cut-off voltage, the display charge state of the target battery pack at the previous moment k-1 and the full charge display charge state of the target battery pack.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be additional divisions in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
Further, the units described as separate units may or may not be physically separate, and units displayed as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Furthermore, functional modules in various embodiments of the present application may be integrated together to form a single portion, or each module may exist alone, or two or more modules may be integrated to form a single portion.
In this document, 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.
The above is only an example of the present application, and is not intended to limit the scope of the present application, and various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (16)
- A method of determining a display state of charge, comprising:acquiring the actual voltage of an ith system cell in a target battery pack at a current time k, the charging cut-off voltage of the ith system cell and the actual voltage of a previous time k-1, wherein I is a positive integer and is less than or equal to I, I is the number of types of battery anode materials in the target battery pack, the current time k is any time in a time interval in which the ending time of an nth display period is located, and the previous time k-1 is any time in a time interval in which the ending time of the nth display period is located;Determining the display charge state of the ith system cell in the target battery pack in the (n+1) th display period according to the actual voltage of the current moment k, the actual voltage of the previous moment k-1, the charge cut-off voltage, the display charge state of the target battery pack at the previous moment k-1 and the full charge display charge state of the target battery pack;and determining the display charge state of the target battery pack in the n+1th display period according to the display charge states of all system cells in the target battery pack in the n+1th display period.
- The method of claim 1, wherein the determining the display state of charge of the ith system cell in the target battery pack at the n+1th display period based on the actual voltage at the current time k, the actual voltage at the previous time k-1, the charge cutoff voltage, the display state of charge at the previous time k-1 of the target battery pack, and the full charge display state of charge of the target battery pack comprises:judging whether the target battery pack is in a charging end state or not;and if the target battery pack is in a charging end state, determining the display charge state of the ith system cell in the target battery pack in the (n+1) th display period according to the actual voltage of the current moment k, the actual voltage of the previous moment k-1, the charging cut-off voltage, the display charge state of the previous moment k-1 of the target battery pack and the full charge display charge state of the target battery pack.
- The method of claim 2, wherein the determining whether the target battery pack is in an end-of-charge state comprises:judging whether a target vehicle provided with the target battery pack is in a gun inserting charging state or not;if the target vehicle is in a gun inserting charging state, judging whether a state parameter corresponding to the target battery pack is in a preset interval or not;and if the state parameter corresponding to the target battery pack is in the preset interval, indicating that the target battery pack is in the state of the charging end.
- The method of claim 3, wherein the determining whether the state parameter corresponding to the target battery pack is within a preset interval comprises:judging whether the charging current of the target battery pack is smaller than a first preset threshold value or not;judging whether the maximum cell terminal voltage in the target battery pack is larger than a second preset threshold value or not;judging whether the display charge state of the target battery pack is larger than a third preset threshold value or not;and if the charging current of the target battery pack is smaller than a first preset threshold value, the maximum cell terminal voltage in the target battery pack is larger than a second preset threshold value, and the display charge state of the target battery pack is larger than a third preset threshold value, indicating that the state parameter corresponding to the target battery pack is in a preset interval.
- The method according to any one of claims 1-4, wherein determining the display state of charge of the ith architecture cell in the target battery pack at the (n+1) th display period according to the actual voltage at the present time k, the actual voltage at the previous time k-1, the charge cutoff voltage, the display state of charge at the previous time k-1 of the target battery pack, and the full charge display state of charge of the target battery pack comprises:and determining the display charge state of the ith system cell in the target battery pack in the (n+1) th display period according to a preset filtering algorithm, the actual voltage of the current moment k, the actual voltage of the previous moment k-1, the charge cut-off voltage, the display charge state of the target battery pack at the previous moment k-1 and the full charge display charge state of the target battery pack.
- The method of claim 5, wherein the display state of charge of the ith system cell of the target battery pack at the (n+1) th display period is determined by the following equation:SOC(n+1) i ＝SOC(n) i +(F(V(n+1) i )-F(Vn i ))*(SOC(end)-SOC(n) i )/(F(Vend)-F(Vn i ))；wherein SOC (n+1) i Representing the display charge state of an ith system cell in the target battery pack in an (n+1) th display period; SOC (n) i Representing the display charge state of an ith system cell in the target battery pack in an nth display period; SOCend represents the full charge display state of charge of the target battery pack; f () represents a preset filtering algorithm; f (V (n+1) i ) Representing the fitting voltage of an ith system cell in the target battery pack in an (n+1) th display period; f (V (n+1) i ) Representing the fitting voltage of an ith system cell in the target battery pack in an (n+1) th display period;f (Vend) represents a fitted cutoff voltage of the target battery pack; v (n+1) i Representing the actual voltage of an ith system cell in the target battery pack at the starting time of an (n+1) th display period; vn i Representing the actual voltage of an ith system cell in the target battery pack at the starting time of an nth display period; vend represents the charge cutoff voltage of the target battery pack.
- The method according to any one of claims 1-6, wherein determining the display state of charge of the target battery pack in the n+1th display period according to the display state of charge of all system cells in the target battery pack in the n+1th display period comprises:determining the maximum display charge state in the target battery pack and the minimum display charge state in the target battery pack according to the display charge states of all system cells in the target battery pack in the n+1th display period;And determining the display charge state of the target battery pack in the (n+1) th period according to the maximum display charge state and the minimum display charge state.
- The method of claim 7, wherein the display state of charge of the target battery pack at the n+1 cycle is determined by the following equation:PackDispSOC(n+1)＝minDispSOC(n+1)/(1-(maxDispSOC(n+1)-minDispSOC(n+1)))*100％；wherein, packDispSOC (n+1) is the display charge state of the target battery pack in the (n+1) th display period; minDispSOC is the minimum display state of charge in the target battery pack; maxdispssoc is the maximum displayed state of charge in the target battery pack.
- The method of claim 7, wherein determining the display state of charge of the target battery pack at the n+1 th cycle based on the maximum display state of charge and the minimum display state of charge comprises:when the maximum display charge state is greater than a first specified value, determining the maximum display charge state as the display charge state of the target battery pack in the n+1th period;and when the minimum display charge state is larger than a second designated value, determining the minimum display charge state as the display charge state of the target battery pack in the n+1th period.
- The method of claim 1, wherein determining the display state of charge of the target battery pack for the n+1th display period based on the display state of charge of all system cells in the target battery pack for the n+1th display period comprises:and determining the display charge state of the target battery pack in the n+1th period according to the display charge states of all system cells in the target battery pack in the n+1th period and the corresponding credibility values of all system cells.
- The method according to any one of claims 1-10, wherein the obtaining the actual voltage of the i-th system cell at the current time k, the charge cutoff voltage of the i-th system cell, and the actual voltage of the previous time k-1 in the target battery pack includes:acquiring charging state data of the target battery pack recorded by a battery management system, wherein the charging state data is a current actual charging state or a charging mark;and if the charge state data is a specified value, acquiring the actual voltage of the ith system cell in the target battery pack at the current time k, the charge cut-off voltage of the ith system cell and the actual voltage of the previous time k-1.
- The method according to any one of claims 1-10, wherein the obtaining the actual voltage of the i-th system cell at the current time k, the charge cutoff voltage of the i-th system cell, and the actual voltage of the previous time k-1 in the target battery pack includes:judging whether the maximum cell terminal voltage in the actual voltage at the current moment k is smaller than a fourth preset threshold value or not;and if the maximum cell terminal voltage in the actual voltage at the current moment k is smaller than a fourth preset threshold value, acquiring the actual voltage of the ith system cell in the target battery pack at the current moment k, the charge cut-off voltage of the ith system cell and the actual voltage at the previous moment k-1.
- An apparatus for determining a display state of charge, comprising:the device comprises an acquisition module, a display module and a display module, wherein the acquisition module is used for acquiring the actual voltage of an ith system cell in a target battery pack at the current moment k, the charge cut-off voltage of the ith system cell and the actual voltage of a previous moment k-1, wherein I is a positive integer and is less than or equal to I, I is the type number of battery positive electrode materials in the target battery pack, the current moment k is any moment in a time interval in which the ending moment of an nth display period is located, and the previous moment k-1 is any moment in a time interval in which the ending moment of the nth display period is located;The first determining module is configured to determine a display charge state of the ith system cell in the target battery pack in an (n+1) th display period according to an actual voltage of the current time k, an actual voltage of the previous time k-1, the charge cut-off voltage, a display charge state of the target battery pack at the previous time k-1 and a full charge display charge state of the target battery pack;and the second determining module is used for determining the display charge state of the target battery pack in the (n+1) th display period according to the display charge states of all system battery cells in the target battery pack in the (n+1) th display period.
- A battery management chip, comprising: comprising a processor and a memory storing computer readable instructions which, when executed by the processor, perform the method of any of claims 1-12.
- An electronic device comprising a processor and a memory storing computer readable instructions that, when executed by the processor, perform the method of any of claims 1-12.
- A readable storage medium having stored thereon a computer program which, when executed by a processor, performs the method of any of claims 1-12.
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| PCT/CN2021/120794 WO2023044874A1 (en) | 2021-09-26 | 2021-09-26 | Method and device for determining display state of charge, and battery management chip |
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| CN116754963A (en) * | 2023-08-22 | 2023-09-15 | 深圳市德兰明海新能源股份有限公司 | Calculation method of lithium battery SOC display value |
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| CN116754966A (en) * | 2023-08-16 | 2023-09-15 | 浙江艾罗网络能源技术股份有限公司 | Calibration method and device for battery state of charge, electronic equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20140278170A1 (en) * | 2013-03-15 | 2014-09-18 | Qualcomm Incorporated | State of charge (soc) display for rechargeable battery |
| KR101717376B1 (en) * | 2015-11-23 | 2017-03-16 | 동의대학교 산학협력단 | Battery charging apparatus and the controlling method |
| JP2018085789A (en) * | 2016-11-21 | 2018-05-31 | トヨタ自動車株式会社 | Secondary battery system |
| CN110988692A (en) * | 2019-10-18 | 2020-04-10 | 湖南小步科技有限公司 | SOC display method and device of battery management system |
| CN113002363B (en) * | 2021-03-03 | 2023-03-17 | 一汽解放汽车有限公司 | Method and device for correcting battery charge, vehicle and medium |
| CN113232552B (en) * | 2021-05-20 | 2023-04-07 | 中国第一汽车股份有限公司 | Electric automobile and calculation method, display method and device of residual electric quantity thereof |
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| CN116754963A (en) * | 2023-08-22 | 2023-09-15 | 深圳市德兰明海新能源股份有限公司 | Calculation method of lithium battery SOC display value |
| CN116754963B (en) * | 2023-08-22 | 2023-10-20 | 深圳市德兰明海新能源股份有限公司 | Calculation method of lithium battery SOC display value |
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