CN116635729A - Method and device for determining and displaying state of charge and battery management chip - Google Patents

Method and device for determining and displaying state of charge and battery management chip Download PDF

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Publication number
CN116635729A
CN116635729A CN202180085512.0A CN202180085512A CN116635729A CN 116635729 A CN116635729 A CN 116635729A CN 202180085512 A CN202180085512 A CN 202180085512A CN 116635729 A CN116635729 A CN 116635729A
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display
state
charge
period
battery pack
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CN202180085512.0A
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黄磊
陈晨
赵微
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The application provides a method and a device for determining and displaying a state of charge and a battery management chip, and relates to the field of battery management. In the method, the actual charge state of the ith system cell in the target battery pack of the mth sampling period corresponding to the current time k and the display charge state of the ith system cell of the nth display period corresponding to the current time k are obtained; determining the change rate of the display charge state of the ith system cell in the (n+1) th display period; determining the display charge state of the (n+1) th display period of the (i) th system battery cell according to the change rate of the display charge state of the (i) th system battery cell of the (n+1) th display period, the reliability compensation coefficient and the display charge state of the (i) th system battery cell of the (n) th display period; and determining the display charge state of the target battery pack in the n+1th period according to the display charge state of each system cell in the target battery pack in the n+1th period.

Description

Method and device for determining and displaying state of charge and battery management chip Technical Field
The present application relates to the field of battery management, and in particular, to a method and an apparatus for determining a state of charge and a battery management chip.
Background
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, there is often a deviation between the display SOC and the actual SOC, and how to accurately represent the actual SOC becomes a technical problem to be solved in the field of battery management.
Disclosure of Invention
The application 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 charge state of an ith system cell in a target battery pack of an mth sampling period corresponding to a current time k and the display charge state of the ith system cell of an nth display period corresponding to the current time k, wherein the current time k is the time before the end of the nth display period, I is a positive integer and is less than or equal to I, and I is the type number of battery anode materials in the target battery pack;
Determining the change rate of the display charge state of the ith system cell in the (n+1) th display period according to the display charge state of the ith system cell in the nth display period, the actual charge state of the ith system cell in the (m) th sampling period and the change rate of the display charge state of the ith system cell in the nth display period;
determining the display charge state of the (n+1) th display period of the (n+1) th system battery cell according to the change rate and the reliability compensation coefficient of the display charge state of the (i) th system battery cell of the (n+1) th display period and the display charge state of the (i) th system battery cell of the (n) th display period;
and determining the display charge state of the target battery pack in the n+1th period according to the display charge state of each system cell in the target battery pack in the n+1th period.
In the above method, when the display SOC at the nth time deviates from the actual SOC at the nth time, the rate of change of the display SOC of each system cell in the n+1 display period may be determined according to the charge/discharge state at the nth time. Further, the display SOC of each system cell at the n+1-th time is calculated based on the display SOC of the n-th display and the determined change rate. Thus, correction of the display SOC of each system is realized. Further, according to the display charge state of each system battery cell in the n+1th display period, the display SOC observed by the user at the n+1th moment is more accurate.
In a possible implementation manner, the determining the change rate of the display charge state of the ith system cell in the (n+1) th display period according to the display charge state of the ith system cell in the nth display period, the actual charge state of the ith system cell in the (m) th sampling period and the change rate of the display charge state of the nth display period of the ith system cell includes:
and determining the change rate of the display charge state of the ith system cell in the (n+1) th display period according to the charge and discharge state of the target battery pack at the current moment k, the display charge state of the ith system cell in the (n) th display period, the actual charge state of the ith system cell in the (m) th sampling period and the change rate of the display charge state of the ith system cell in the (n) th display period.
In a possible implementation manner, in a case that the target battery pack is in a charging or recharging state at the current time k, the change rate of the display charge state of the ith system battery cell in the (n+1) th display period is determined by the following formula:
ChangeRate(n+1) i ＝KC i *ChangeRate(n) i *[1-(DSOC(n) i -ASOC(m) i )/(FSOC-DSOC(n) i )]；
wherein ChangeRate (n+1) i The change rate of the display charge state of the ith system cell in the (n+1) th display period is set;
ChangeRate(n) i The change rate of the display charge state of the ith system cell in the nth display period is set;
DSOC(n) i the charge state of the ith system cell in the nth display period is displayed;
ASOC(m) i the actual charge state of the ith system cell in the mth sampling period is obtained;
FSOC is the corresponding display charge state when the set target battery pack is fully charged, and the FSOC is larger than DSOC (n) i ；
KC i Adjusting parameters for the first adaptability of the ith system cell, wherein KC i ∈(0，1)。
In a possible implementation manner, when the target battery pack is in a discharging state at the current time k, the change rate of the display charge state of the ith system battery cell in the (n+1) th display period is determined by the following formula:
ChangeRate(n+1) i ＝KD i *ChangeRate(n) i *[1+(DSOC(n) i -ASOC(m) i )/DSOC(n) i ]；
wherein ChangeRate (n+1) i The change rate of the display charge state of the ith system cell in the (n+1) th display period is set; changeRate (n) i The change rate of the display charge state of the ith system cell in the nth display period is set; DSOC (n) i The display charge state of the ith system cell in the nth display period is not 0; ASOC (m) 1 For the ith system cell at the mth sampling periodIs the actual state of charge of (a); KD (KD) i Adjusting parameters for a second adaptation of the ith system cell, wherein KD i ∈(0，1)。
In one possible embodiment, the display charge state of the ith system cell in the (n+1) th display period is determined by the following formula: DSOC (n+1) i ＝DSOC(n) i +[((∑ j KR i *DSOC(n) j /KR j *DSOC(n) i )-1)/(I-1)]*SteiSOC(n+1) i *Cd*ChangeRate(n+1) i ；
Wherein I represents the number of kinds of battery positive electrode materials in the target battery pack; DSOC (n+1) i The charge state of the ith system cell in the (n+1) th display period is displayed; DSOC (n) i The charge state of the ith system cell in the nth display period is displayed; stepoc (n+1) i The change quantity of the actual charge state of the ith system cell in the (n+1) th display period is obtained; KR (KR) i The reliability compensation coefficient corresponding to the actual state of charge of the ith system cell in the (n+1) th display period; KR (KR) j The reliability compensation coefficient corresponding to the actual state of charge of the battery cell of the jth system in the (n+1) th display period; and Cd is a value representing the current direction, when the battery pack is in a charging state, the Cd is +1, and when the battery pack is in a discharging state, the Cd is-1.
In a possible embodiment, the variation of the actual state of charge of the ith system cell in the (n+1) th display period is determined by: stepoc (n+1) i ＝Td*I i (k)/Ncap；
Wherein Td is the duration of one display period; i i (k) The current value of the ith system cell at the current moment k; ncap is the nominal capacity of the 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 display charge state of each system cell 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 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- (maxDISPOC (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, 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 the above embodiment, when the maximum display state of charge or the minimum display state of charge satisfies a certain condition, the maximum display state of charge or the minimum display state of charge may be better represented as the state of charge of the overall battery pack, so that the maximum display state of charge or the minimum display state of charge is directly used as the state of charge of the overall target battery pack, and the calculation amount may be reduced while the accuracy of the display state of charge of the target battery pack may be maintained.
In a possible implementation manner, the determining the display charge state of the target battery pack in the n+1th period according to the display charge state of each system cell 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+1) th period according to the display charge state of each system cell in the target battery pack in the (n+1) th period and the corresponding reliability value of each system cell.
In the embodiment, the influence of each system cell on the charge state of the whole battery pack can be better considered, so that the determined display charge state is more accurate.
In a second aspect, the present application also provides 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 charge state of an ith system cell in a target battery pack of an mth sampling period corresponding to a current time k and the display charge state of the ith system cell of an nth display period corresponding to the current time k, the current time k is the time before the end of the nth display period, I is a positive integer and is less than or equal to I, and I is the number of cells in the target battery pack;
the first determining module is used for determining the change rate of the display charge state of the ith system cell in the (n+1) th display period according to the display charge state of the ith system cell in the (n) th display period, the actual charge state of the ith system cell in the (m) th sampling period and the change rate of the display charge state of the ith system cell in the (n) th display period;
The second determining module is used for determining the display charge state of the (n+1) th display period of the (i) th system battery cell according to the change rate of the display charge state of the (i) th system battery cell of the (n+1) th display period, the reliability compensation coefficient and the display charge state of the (i) th system battery cell of the (n) th display period;
and the third determining module is used for determining the display charge state of the target battery pack in the n+1th period according to the display charge state of each system cell in the target battery pack in the n+1th period.
In a third aspect, the present application also provides a battery management chip, including: comprising a processor and a memory storing computer readable instructions which, when executed by the processor, perform a method according to the first aspect of the application.
In a fourth aspect, an embodiment of the present application provides an electronic device comprising a processor and a memory storing computer readable instructions which, when executed by the processor, perform the steps of the method as provided in the first aspect above.
In a fifth aspect, an embodiment of the present application provides a readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method as provided in the first aspect above.
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.
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 can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for determining a display state of charge provided by an embodiment of the present application;
FIG. 2 is a schematic diagram of two periods for determining a display state of charge according to an embodiment of the present application;
FIG. 3 is a partial flow chart of a method for determining a display state of charge provided by an embodiment of the present application;
FIG. 4 is another partial flow chart of a method for determining a display state of charge according to an embodiment of the present application
FIG. 5 is a functional block diagram of an apparatus for determining a display state of charge according to an embodiment of the present application;
fig. 6 is a circuit connection block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Interpretation of technical terms:
state of charge: the ratio of the remaining capacity of the battery after a period of use or a 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 of the electronic device.
Terminal voltage: the voltage values of the two ends of the battery core are collected by the power management system.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application.
Currently, the correction display SOC method 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 display SOC needs 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 SOC according to a preset calibration table; and calibrating the display SOC 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 cell characteristics of the LFP battery cell, the calculated real SOC is not accurate enough, the display SOC after calibration is also inaccurate, the phenomena of uneven calculation speed, jump and the like of the display SOC 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 application for the above problems should be all contributions to the application by the inventors during the inventive process. The following describes, by way of some examples, the solution used by the present application to solve the drawbacks of the solutions of the prior art.
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 state of charge provided by 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, the method for determining a display state of charge according to the embodiment of the present application may include the following steps.
Step 110, obtaining the actual charge state of the ith system cell in the target battery pack of the mth sampling period corresponding to the current time k and the display charge state of the ith system cell of the nth display period corresponding to the current time k.
The current time k is the time before the end of the nth display period, wherein I is a positive integer and is less than or equal to I, and I is the number of types of battery positive electrode materials in the target battery pack.
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 the time before the end of the nth display period. Illustratively, the current time k may be any time after the nth display period and the nth display period is a specified proportion. For example, the current time k may be any time after four fifth of the nth display period. For example, the current time k may also be at a nine tenth period time of the nth display period. For another example, the current time k may be at fourteen cycle times of fifteenth display cycle.
The current time 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 status, actual state of charge, display state of charge, etc., for each acquisition time period within a fixed time period. Alternatively, the time length of each parameter acquisition period may be the same as the time length of the display period, or may be different (in the example shown in fig. 2, the display period for displaying the state of charge is different from the sampling period for the actual state of charge).
As a possible implementation manner, the battery management system acquires and records the actual state of charge in each sampling period; and acquiring and recording the display charge state in each display period according to 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.
As shown in fig. 2, two cycle diagrams of the battery pack are shown in the drawing, a display cycle and a sampling cycle, respectively. Wherein a plurality of display periods are shown on the display period: td1, td2, td3, …, td (n), td (n+1), …, and the display state of charge corresponding to each display period, for example, the display state of charge corresponding to the first display period Td1 is DSOC (1) and the display state of charge corresponding to the nth display period Td (n) is DSOC (n). A number of sampling periods are shown over the sampling period: ts1, ts2, ts3, …, ts (m), …, and an actual state of charge corresponding to each sampling period, e.g., the actual state of charge corresponding to the first sampling period Ts1 is ASOC (1), and the actual state of charge corresponding to the mth display period Td (m) is ASOC (m).
In the example shown in fig. 2, the current time k is a critical time between the nth display period T (n) and the nth display period T (n+1), and the current time k is located in the mth sampling period.
In order to facilitate recording of different moments and sampling periods and display periods corresponding to the moments, the moments are recorded as: time 0, time 1, time 2, time 3, … …, time k-1, time k, time k+1, time …. The sampling period is recorded as: sample period 1, sample period 2, sample period 3, sample period … …, sample period m-1, sample period m, sample period m+1th sample period …. The display period is recorded as: the 1 st display period, the 2 nd display period, the 3 rd display period, … …, the n-1 st display period, the n display period, the n+1 th display period …. Wherein k, n and m are integers greater than or equal to 1.
As one possible implementation, the electronic device may obtain the display state of charge by: the electronic device records and displays the state of charge to the memory before each power down. At the initial time of powering on the electronic device, the display charge state recorded before the last powering down of the memory can be read and used as the display charge state of the 1 st display period.
As one possible implementation, the electronic device may obtain the actual state of charge by: parameters such as the current temperature, current, working condition and usable electric quantity interval of the battery core in the battery pack are collected, and in each sampling period, the actual state of charge in each sampling period is calculated according to the parameters such as the temperature, current, working condition and usable electric quantity interval of the battery core in the battery pack in the sampling period and the method of calculating the actual state of charge according to an ampere-hour integration method and the like.
As a possible implementation manner, as shown in fig. 2, the battery management system may determine, according to the current time k, an mth sampling period and an nth display period that the current time k falls into. Based on the time at which the current time k is located, the actual state of charge of the mth sampling period and the display state of charge of the nth display period corresponding to the current time k can be determined.
As a possible implementation manner, the current time k is a time before the end of the nth display period, and the next time k+1 of the current time k may be a time when the n+1th display period starts.
Step 120, determining the change rate of the display charge state of the ith system cell in the (n+1) th display period according to the display charge state of the ith system cell in the nth display period, the actual charge state of the ith system cell in the (m) th sampling period and the change rate of the display charge state of the nth display period of the ith system cell.
The value of I may be equal to or greater than one and equal to or less than I.
Optionally, the change rate of the display charge state of the ith system cell in the n+1th display period may be determined according to the charge/discharge state of the target battery pack at the current time k, the display charge state of the ith system cell in the nth display period, the actual charge state of the ith system cell in the mth sampling period, and the change rate of the display charge state of the ith system cell in the nth display period.
The charging and discharging states comprise a charging state and a discharging state, wherein the charging state comprises a direct charging state and a recharging state.
On the one hand, when detecting that a charging device (such as a charging gun, a charging bank and the like) is plugged in a charging interface of the electronic device and the current direction is an input direction, determining that the target battery pack is in a direct charging state; on the other hand, when the charging interface of the electronic equipment is not detected to be plugged with charging equipment (such as a charging gun, a charging device and the like) and the current direction is the input direction, determining that the target battery pack is in a recharging state; in yet another aspect, when the current direction of the electronic device is detected as the output direction, it is determined that the target battery pack is in a discharge state.
Based on the above, step 120 may include four possible embodiments as follows:
the first scheme is as follows: when the k-th target battery pack is in a charging state and does not reach the charging end at the current moment and the display charge state of the n-th display period of the i-th system battery cell is higher, determining the change rate of the display charge state of the n+1-th display period of the i-th system battery cell according to the change rate of the display charge state of the n-th display period of the i-th system battery cell and the change rate of the display charge state of the n+1-th display period of the i-th system battery cell is smaller than the change rate of the display charge state of the n-th display period of the i-th system battery cell.
In this embodiment, when the k-th target battery pack is in a charged state and does not reach the charging end at the current moment, and the display charge state of the nth display period of the ith system battery cell is higher, the change rate of the display charge state of the ith system battery cell needs to be reduced in the (n+1) th display period, so that the display charge state of the (n+1) th display period of the ith system battery cell is closer to the actual charge state of the ith system battery cell.
The second scheme is as follows: when the k-th target battery pack is in a charging state and does not reach the charging end at the current moment and the display charge state of the n-th display period of the i-th system battery cell is lower, determining the change rate of the display charge state of the n+1-th display period of the i-th system battery cell according to the change rate of the display charge state of the n-th display period of the i-th system battery cell and the change rate of the display charge state of the n+1-th display period of the i-th system battery cell is larger than the change rate of the display charge state of the n-th display period of the i-th system battery cell.
In this embodiment, when the battery pack is in a charging state at the current moment k and does not reach the charging end, and the display state of charge of the nth display period of the ith system battery cell is low, the change rate of the display state of the ith system battery cell needs to be increased in the (n+1) th display period, so that the display state of charge of the (n+1) th system battery cell is closer to the actual state of charge of the ith system battery cell.
In this embodiment, in the first and second aspects described above, it may be determined that the target battery pack is in the charge end state when it is detected that any one of the following conditions is satisfied. Conditions include, but are not limited to: the current value of the charging current is smaller than a preset current value, the voltage value of the cell terminal voltage of the battery pack is larger than a preset voltage value, or the magnitude of the display state of charge is larger than a preset SOC value. Otherwise, determining that the target battery pack is not in the charge end state.
When the charging end is not reached, the display state of charge of the n+1th display period of the i-th system battery cell is calculated by using the change rate of the display state of charge of the n+1th display period of the i-th system battery cell, so that the accuracy of the display state of charge can be considered and no jump occurs.
Third scheme: when the k-th target battery pack is in a discharging state and the display charge state of the nth display period of the i-th system battery cell is higher, determining the change rate of the display charge state of the (n+1) -th display period of the i-th system battery cell according to the change rate of the display charge state of the nth display period of the i-th system battery cell, wherein the change rate of the display charge state of the (n+1) -th display period of the i-th system battery cell is larger than the change rate of the display charge state of the (n) -th display period of the i-th system battery cell.
In this embodiment, when the k-th target battery pack is in a discharging state and the display charge state of the nth display period of the ith system battery cell is higher, the change rate of the display charge state of the ith system battery cell needs to be increased in the (n+1) -th display period, so that the display charge state of the (n+1) -th time of the ith system battery cell is closer to the actual charge state of the ith system battery cell.
Fourth scheme: under the condition that the k-th target battery pack is in a discharging state and the display charge state of the n-th display period is lower at the current moment, determining the change rate of the display charge state of the n+1th display period of the i-th system battery cell according to the change rate of the display charge state of the n-th display period of the i-th system battery cell, wherein the change rate of the display charge state of the n+1th display period of the i-th system battery cell is smaller than the change rate of the display charge state of the n-th display period of the i-th system battery cell.
In this embodiment, when the k-th target battery pack is in a discharging state and the display charge state of the nth display period of the ith system battery cell is low, the change rate of the display charge state of the ith system battery cell needs to be reduced in the (n+1) th display period, so that the display charge state of the (n+1) th display period of the ith system battery cell is closer to the actual charge state of the ith system battery cell.
And 130, determining the display charge state of the (n+1) th display period of the (i) th system battery cell according to the change rate of the display charge state of the (i) th system battery cell of the (n+1) th display period, the reliability compensation coefficient and the display charge state of the (i) th system battery cell of the (n) th display period.
It will be appreciated that the display state of charge for the n+1th display period of the i-th system cell depends at least on the magnitude of the display state of charge for the n-th display period of the i-th system cell and the rate of change of the display state of charge for the n+1th display period of the i-th system cell. The iterative calculation mode enables the display charge state of the next display period of the ith system battery cell to have higher accuracy.
In general, the display charge state of the ith system cell at the same time is deviated from the actual charge state of the ith system cell. Wherein the deviation includes being higher or lower. It can be understood that if the display charge state of the nth display period of the ith system battery cell corresponding to the current time k is greater than the actual charge state of the mth sampling period of the ith system battery cell or exceeds the first preset amplitude of the actual charge state of the mth sampling period of the ith system battery cell, determining that the display charge state of the nth display period of the ith system battery cell is higher; if the actual charge state of the ith sampling period of the ith system battery cell corresponding to the current moment k is larger than the display charge state of the nth display period of the ith system battery cell or exceeds the second preset amplitude of the display charge state of the nth display period of the ith system battery cell, determining that the display charge state of the nth display period of the ith system battery cell is lower.
As a possible implementation, step 130 may specifically be: and under the condition that the battery pack is in a charging state at the current moment and does not reach the charging end, calculating the display charge state at the (n+1) th moment of the (i) th system battery cell according to the display charge state of the (n) th display period of the (i) th system battery cell and the change rate of the display charge state of the (n+1) th display period of the (i) th system battery cell.
And 140, determining the display charge state of the target battery pack in the n+1th period according to the display charge states of all system battery cells in the target battery pack in the n+1th period.
Alternatively, an average value of the display states of charge of each system cell in the n+1th display period may be calculated, and the average value is taken as the display state of charge of the target battery pack in the n+1th display period.
Alternatively, the display charge states of one or more system cells can be determined, so as to determine the display charge states of the target battery pack in the n+1th period.
As one possible implementation manner, the scheme for determining the display charge state of the ith system cell in the (n+1) th display period includes, but is not limited to, the following two types:
scheme one: if the target battery pack is in a discharging state, determining the change rate of the display charge state of the ith system battery cell in the (n+1) th display period according to the following formula:
ChangeRate(n+1) i ＝KD i *ChangeRate(n) i *[1+(DSOC(n) i -ASOC(m) i )/DSOC(n) i ]；
Wherein ChangeRate (n+1) i The change rate of the display charge state of the ith system cell in the (n+1) th display period is set; changeRate (n) i The change rate of the display charge state of the ith system cell in the nth display period is set; DSOC (n) i The charge state of the ith system cell in the nth display period is displayed and is not 0; ASOC (m) 1 The actual charge state of the ith system cell in the mth sampling period is obtained; KD (KD) i Adjusting parameters for the second adaptation of the ith system cell, wherein KD i ∈(0，1)。
It will be appreciated that while the target battery pack is in a discharged state, (DSOC (n) i -ASOC(m) i )//DSOC(n) i To show the bias rate of the state of charge. When DSOC (n) i When the difference from ASOC (n) is greater than 0, it indicates that the display state of charge is higher, the display state of charge change rate is lower, and [1+ (DSOC (n)) i -ASOC(m) i )/DSOC(n) i ]Greater than 1, then ChangeRate (n+1) can be made i Greater than ChangeRate (n) i . When DSOC (n) i -ASOC(m) i Below 0, the indication shows a lower state of charge, a higher rate of change of state of charge, and [1+ (DSOC (n)) i -ASOC(m) i )/DSOC(n) i ]Less than 1, then ChangeRate (n+1) can be made i Less than ChangeRate (n) i 。
Scheme II: if the target battery pack is in a charging state and does not reach a charging end state, determining the change rate of the display state of charge of the ith system battery cell in the (n+1) th display period according to the following formula:
ChangeRate(n+1) i ＝KC i *ChangeRate(n) i *[1-(DSOC(n) i -ASOC(m) i )/(FSOC-DSOC(n) i )]；
Wherein ChangeRate (n+1) i The change rate of the display charge state of the ith system cell in the (n+1) th display period is set; changeRate (n) i The change rate of the display charge state of the ith system cell in the nth display period is set; DSOC (n) i The charge state of the ith system cell in the nth display period is displayed; ASOC (m) i The actual charge state of the ith system cell in the mth sampling period is obtained; FSOC is the corresponding display charge state when the target battery pack is set to be full, and the FSOC is larger than DSOC (n) i ；KC i A first adaptive parameter for the ith system cell, wherein KC i ∈(0，1)。
Illustratively, the battery pack is inWhen the state of charge is not reached and the state of charge end is not reached, (DSOC (n) i -ASOC(m) i )/(FSOC-DSOC(n) i ) To show the bias rate of the state of charge. Because the charging end is not reached, FSOC is greater than DSOC (n) i . When DSOC (n) i -ASOC(m) i Above 0, the description shows a higher state of charge, and [1- (DSOC (n)) i -ASOC(m) i )/(FSOC-DSOC(n) i )]Less than 1, then ChangeRate (n+1) can be made i Less than ChangeRate (n) i . When DSOC (n) i -ASOC(m) i Below 0, the description shows a lower state of charge, and [1- (DSOC (n)) i -ASOC(m) i )/(FSOC-DSOC(n) i )]Greater than 1, then ChangeRate (n+1) can be made i Greater than ChangeRate (n) i 。
As a possible implementation manner, calculating the display charge state of the ith architecture cell in the (n+1) th display period may be performed as follows:
As shown in fig. 3, the method for determining and calculating the display charge state of the ith system cell in the (n+1) th display period includes:
step 210, determining whether the target battery pack is in a charged state and does not reach a charged end state.
If so, step 220 is performed.
Step 220, calculating the display charge state of the ith system cell in the (n+1) th display period according to the following formula:
DSOC(n+1) i ＝DSOC(n) i +[((∑ j KR i *DSOC(n) j /KR j *DSOC(n) i )-1)/(I-1)]*SteiSOC(n+1) i *Cd*ChangeRate(n+1) i ；
wherein I represents the number of kinds of battery positive electrode materials in the target battery pack; DSOC (n+1) i The charge state of the ith system cell in the (n+1) th display period is displayed; DSOC (n) i For the ith system cell in the nth display periodDisplaying the state of charge; stepoc (n+1) i The change quantity of the actual charge state of the ith system cell in the (n+1) th display period is obtained; KR (KR) i The reliability compensation coefficient corresponding to the actual state of charge of the ith system cell in the (n+1) th display period; KR (KR) j The reliability compensation coefficient corresponding to the actual state of charge of the battery cell of the jth system in the (n+1) th display period; cd is a value representing the current direction, and is +1 when the battery pack is in a charging state, and is-1 when the battery pack is in a discharging state.
The reliability compensation coefficient KR can be used as a predicted error value of the display state of charge of each system cell. The confidence coefficient KR may take a value between (0, 1). For example, if the system cell is subjected to high-precision correction, the reliability compensation coefficient of the system cell is smaller, for example, the reliability compensation coefficient of the system cell may be 0.1, 0.2, or 0.15, and if the error of the state of charge of the system cell is greater than a set threshold, the reliability compensation coefficient of the system cell is larger, for example, the reliability compensation coefficient of the system cell may be 0.7, 0.8, or 0.9.
The change amount of the actual state of charge in one display period can be calculated by an ampere-hour integration method and the actual current flowing through the battery pack. Illustratively, the change amount of the actual state of charge of the ith system cell in the (n+1) th display period may be determined by: stepoc (n+1) i ＝Td*I i (k)/Ncap；
Wherein, stepoc (n+1) i The change quantity of the actual charge state of the ith system cell in the (n+1) th display period is obtained; td is the duration of one display period; wherein Td is the duration of one display period; i i (k) For the current value of the ith system cell at the current time k, the current value I of the target battery pack i (k) The current value of the main loop at the current moment k in the charge and discharge process of the battery pack.
Wherein, ncap is the nominal capacity of the battery pack. In this embodiment, the nominal capacity Ncap of the target battery pack is a preset value, and may be determined according to the currently calculated battery pack.
In this embodiment, the display state of charge of the ith system cell at the (n+1) th time in the first embodiment is ChangeRate (n+1) according to the change rate of the display state of charge of the ith system cell at the (n+1) th time i Calculated, and the change rate of the display charge state of the ith system cell at the n+1 time ChangeRate (n+1) i Is calculated according to the actual state of charge of the ith system cell.
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. 4.
Step 310, 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 the battery cells of each system in the target battery pack in the n+1th display period.
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.
Step 320, determining the display state of charge of the target battery pack in the n+1th period according to the maximum display state of charge and the minimum display state of charge.
In an alternative implementation, an average of the maximum display state of charge and the minimum display state of charge may be calculated to determine the display state of charge of the target battery pack at the n+1th cycle.
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; mindistoc (n+1) is the minimum display state of charge in the target battery pack at the n+1th display period; 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 state of each system cell in the target battery pack in the n+1th display period and the reliability value corresponding to each system cell, the display charge state of the target battery pack in the n+1th display period is 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 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.
The following describes the display state of charge of the multi-system battery pack, the display state of charge of each system cell, and the difference between the actual states of charge of each system cell by a set of actual data, as shown in table 1 below:
TABLE 1
As shown in the above table, the value of the state of charge of the target battery pack may be equal to the displayed state of charge of one of the system cells. For example, in the first display period, the display state of charge of the second system cell and the display state of charge of the target battery pack are both 10.5. The state of charge of the target battery pack may also be between the displayed states of charge of the respective system cells, for example, in the second display period, the displayed state of charge 31.6 of the second system cell is greater than the displayed state of charge 30.5 of the target battery pack, but the displayed state of charge 30 of the first system cell is less than the displayed state of charge 30.5 of the target battery pack. For another example, in the third display period, the display state of charge 73.8 of the second body cell is greater than the display state of charge 72.8 of the target battery pack, but the display state of charge 70 of the first body cell is less than the display state of charge 72.8 of the target battery pack. For another example, in the fourth display period, the display state of charge 95.9 of the second body cell is greater than the display state of charge 9.56 of the target battery pack, but the display state of charge 90 of the first body cell is less than the display state of charge 95.6 of the target battery pack.
It can be understood from the above examples that as the battery state of charge increases, the calculated display state of charge may be greater than the actual state of charge, and thus, the value of the determined display state of charge of the target battery pack may be closer to the actual value by the fused calculation of the display states of charge of the respective system cells.
In the above embodiments, when the display SOC at the nth time deviates from the actual SOC at the nth time, the rate of change of the display SOC of each system cell in the n+1 display period may be determined according to the charge/discharge state at the nth time. Further, the display SOC of each system cell at the n+1-th time is calculated based on the display SOC of the n-th display and the determined change rate. Thus, correction of the display SOC of each system is realized. Further, according to the display charge state of each system battery cell in the n+1th display period, the display SOC observed by the user at the n+1th moment is more accurate. Further, when the display charge state of the whole target battery pack is determined, the display charge states of the battery cells of each system and the influence of the battery cells of each system on the charge state of the whole target battery pack can be fully considered.
Referring to fig. 5, 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 by 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. Determining the display state of charge device may include an acquisition module 410, a first determination module 420, a second determination module 430, and a third determination module 440, wherein,
an obtaining module 410, configured to obtain an actual state of charge of an ith system cell in a target battery pack of an mth sampling period corresponding to a current time k and a display state of charge of an ith system cell of an nth display period corresponding to the current time k, where the current time k is a time before the end of the nth display period, I is a positive integer and is less than or equal to I, and I is a number of cells in the target battery pack;
A first determining module 420, configured to determine a rate of change of the display state of charge of the ith system cell in the n+1th display period according to the display state of charge of the ith system cell in the nth display period, the actual state of charge of the ith system cell in the mth sampling period, and the rate of change of the display state of charge of the nth display period of the ith system cell;
a second determining module 430, configured to determine a display charge state of the (n+1) th display period of the (i) th system cell according to a rate of change of the display charge state of the (i) th system cell of the (n+1) th display period, a reliability compensation coefficient, and the display charge state of the (i) th system cell of the (n) th display period;
the third determining module 440 is configured to determine the display state of charge of the target battery pack in the n+1th period according to the display state of charge of each system battery cell in the target battery pack in the n+1th period.
In one possible embodiment, the first determining module 420 is configured to:
and determining the change rate of the display charge state of the ith system cell in the (n+1) th display period according to the charge and discharge state of the target battery pack at the current moment k, the display charge state of the ith system cell in the (n) th display period, the actual charge state of the ith system cell in the (m) th sampling period and the change rate of the display charge state of the nth display period of the ith system cell.
In a possible design, when the target battery pack is in a charging or recharging state at the current time k, the change rate of the display charge state of the ith system cell in the (n+1) th display period is determined by the following formula:
ChangeRate(n+1) i ＝KC i *ChangeRate(n) i *[1-(DSOC(n) i -ASOC(m) i )/(FSOC-DSOC(n) i )]；
wherein ChangeRate (n+1) i The change rate of the display charge state of the ith system cell in the (n+1) th display period is set; changeRate (n) i Display the ith system cell at the nthA rate of change of the display state of charge of the display period; DSOC (n) i The charge state of the ith system cell in the nth display period is displayed; ASOC (m) i The actual charge state of the ith system cell in the mth sampling period is obtained; FSOC is the corresponding display charge state when the target battery pack is set to be full, and the FSOC is larger than DSOC (n) i ；KC i A first adaptive parameter for the ith system cell, wherein KC i ∈(0，1)。
In one possible design, when the target battery pack is in a discharge state at the current time k, the rate of change of the display charge state of the ith system cell in the (n+1) th display period is determined by the following formula:
ChangeRate(n+1) i ＝KD i *ChangeRate(n) i *[1+(DSOC(n) i -ASOC(m) i )/DSOC(n) i ]；
wherein ChangeRate (n+1) i The change rate of the display charge state of the ith system cell in the (n+1) th display period is set;
ChangeRate(n) i The change rate of the display charge state of the ith system cell in the nth display period is set; DSOC (n) i The charge state of the ith system cell in the nth display period is displayed and is not 0; ASOC (m) 1 The actual charge state of the ith system cell in the mth sampling period is obtained; KD (KD) i Adjusting parameters for the second adaptation of the ith system cell, wherein KD i ∈(0，1)。
In one possible embodiment, the display charge state of the i-th system cell in the n+1th display period is determined by the following formula:
DSOC(n+1) i ＝DSOC(n) i +[((∑ j KR i *DSOC(n) j /KR j *DSOC(n) i )-1)/(I-1)]*SteiSOC(n+1) i *Cd*ChangeRate(n+1) i ；
wherein I represents the number of kinds of battery positive electrode materials in the target battery pack; DSOC (n+1) i The charge state of the ith system cell in the (n+1) th display period is displayed; DSOC (n) i The charge state of the ith system cell in the nth display period is displayed; stepoc (n+1) i The change quantity of the actual charge state of the ith system cell in the (n+1) th display period is obtained; KR (KR) i The reliability compensation coefficient corresponding to the actual state of charge of the ith system cell in the (n+1) th display period is obtained; KR (KR) j The reliability compensation coefficient corresponding to the actual state of charge of the battery cell of the jth system in the (n+1) th display period; cd is a value representing the current direction, and is +1 when the battery pack is in a charging state, and is-1 when the battery pack is in a discharging state.
In one possible embodiment, the change in the actual state of charge of the i-th system cell in the n+1th display period is determined by:
StepSOC(n+1) i ＝Td*I i (k)/Ncap；
wherein Td is the duration of one display period; i i (k) The current value of the ith system cell is the current time k; ncap is the nominal capacity of the battery pack.
In a possible design, the third determining module 440 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 a possible design, the third determining module 440 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 a possible design, the third determining module 440 is configured to:
and determining the display charge state of the target battery pack in the n+1th period according to the display charge state of each system cell in the target battery pack in the n+1th period and the corresponding reliability value of each system cell.
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 below by the embodiments of the present application for the above problems should be all contributions to the present application by the inventors during the present application.
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 state of charge of a display as in the above-described embodiments of the application.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an electronic device for performing a display SOC determining method of a battery pack according to an embodiment of the present application, 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 for performing 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. 6 is merely illustrative, and that the electronic device may also include more or fewer components than shown in fig. 6, or have a different configuration than shown in fig. 6. The components shown in fig. 6 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.
An embodiment of the application provides a readable storage medium having stored thereon a computer program which, when executed by a processor, performs a method procedure performed by an electronic device as 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 a charge and discharge state of a battery pack at an nth time, a display SOC at the nth time and an actual SOC at the nth time; determining a deviation of the display SOC from an actual SOC at the nth time; determining the change rate of the display SOC at the time n+1 according to the deviation and the charge and discharge state at the time n; and calculating the display SOC at the n+1th moment according to the change rate of the display SOC at the n+1th moment and the display SOC at the n moment, wherein n is an integer greater than or equal to 1.
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 embodiments of the present application are only examples, and are not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (14)

  1. A method of determining a display state of charge, comprising:
    acquiring the actual charge state of an ith system cell in a target battery pack of an mth sampling period corresponding to a current time k and the display charge state of the ith system cell of an nth display period corresponding to the current time k, wherein the current time k is the time before the end of the nth display period, I is a positive integer and is less than or equal to I, and I is the type number of battery anode materials in the target battery pack;
    determining the change rate of the display charge state of the ith system cell in the (n+1) th display period according to the display charge state of the ith system cell in the nth display period, the actual charge state of the ith system cell in the (m) th sampling period and the change rate of the display charge state of the ith system cell in the nth display period;
    Determining the display charge state of the (n+1) th display period of the (n+1) th system battery cell according to the change rate and the reliability compensation coefficient of the display charge state of the (i) th system battery cell of the (n+1) th display period and the display charge state of the (i) th system battery cell of the (n) th display period;
    and determining the display charge state of the target battery pack in the n+1th period according to the display charge state of each system cell in the target battery pack in the n+1th period.
  2. The method according to claim 1, wherein determining the rate of change of the display state of charge of the ith system cell in the (n+1) th display period according to the display state of charge of the ith system cell in the (n) th display period, the actual state of charge of the ith system cell in the (m) th sampling period, and the rate of change of the display state of charge of the (n) th display period of the (i) th system cell comprises:
    and determining the change rate of the display charge state of the ith system cell in the (n+1) th display period according to the charge and discharge state of the target battery pack at the current moment k, the display charge state of the ith system cell in the (n) th display period, the actual charge state of the ith system cell in the (m) th sampling period and the change rate of the display charge state of the ith system cell in the (n) th display period.
  3. The method according to claim 2, wherein the rate of change of the display state of charge of the i-th system cell in the n+1-th display period is determined by the following formula, in the case where the target battery pack is in a charged or recharged state at the current time k:
    ChangeRate(n+1) i ＝KC i *ChangeRate(n) i *[1-(DSOC(n) i -ASOC(m) i )/(FSOC-DSOC(n) i )]；
    wherein ChangeRate (n+1) i The change rate of the display charge state of the ith system cell in the (n+1) th display period is set;
    ChangeRate(n) i the change rate of the display charge state of the ith system cell in the nth display period is set;
    DSOC(n) i the charge state of the ith system cell in the nth display period is displayed;
    ASOC(m) i the actual charge state of the ith system cell in the mth sampling period is obtained;
    FSOC is the corresponding display charge state when the set target battery pack is fully charged, and the FSOC is larger than DSOC (n) i ；
    KC i Adjusting parameters for the first adaptability of the ith system cell, wherein KC i ∈(0，1)。
  4. The method according to claim 2, wherein the rate of change of the display state of charge of the i-th system cell in the n+1-th display period is determined by the following formula, in the case where the target battery pack is in a discharge state at the current time k:
    ChangeRate(n+1) i ＝KD i *ChangeRate(n) i *[1+(DSOC(n) i -ASOC(m) i )/DSOC(n) i ]；
    Wherein ChangeRate (n+1) i The change rate of the display charge state of the ith system cell in the (n+1) th display period is set;
    ChangeRate(n) i the change rate of the display charge state of the ith system cell in the nth display period is set;
    DSOC(n) i the display charge state of the ith system cell in the nth display period is not 0;
    ASOC(m) 1 the actual charge state of the ith system cell in the mth sampling period is obtained;
    KD i adjusting parameters for a second adaptation of the ith system cell, wherein KD i ∈(0，1)。
  5. The method of claim 3 or 4, wherein the display state of charge of the ith system cell at the n+1th display period is determined by the following formula:
    DSOC(n+1) i ＝DSOC(n) i +[((∑ j KR i *DSOC(n) j /KR j *DSOC(n) i )-1)/(I-1)]*SteiSOC(n+1) i *Cd*ChangeRate(n+1) i ；
    wherein I represents the number of kinds of battery positive electrode materials in the target battery pack;
    DSOC(n+1) i the charge state of the ith system cell in the (n+1) th display period is displayed;
    DSOC(n) i the charge state of the ith system cell in the nth display period is displayed;
    StepSOC(n+1) i the change quantity of the actual charge state of the ith system cell in the (n+1) th display period is obtained;
    KR i the reliability compensation coefficient corresponding to the actual state of charge of the ith system cell in the (n+1) th display period;
    KR j the reliability compensation coefficient corresponding to the actual state of charge of the battery cell of the jth system in the (n+1) th display period;
    And Cd is a value representing the current direction, when the battery pack is in a charging state, the Cd is +1, and when the battery pack is in a discharging state, the Cd is-1.
  6. The method of claim 5, wherein the change in actual state of charge of the ith system cell over the n+1th display period is determined by:
    StepSOC(n+1) i ＝Td*I i (k)/Ncap；
    wherein Td is the duration of one display period;
    I i (k) The current value of the ith system cell at the current moment k;
    ncap is the nominal capacity of the battery pack.
  7. 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 each system cell 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.
  8. 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.
  9. 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.
  10. 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 each system cell in the target battery pack in the n+1th display period comprises:
    And determining the display charge state of the target battery pack in the (n+1) th period according to the display charge state of each system cell in the target battery pack in the (n+1) th period and the corresponding reliability value of each system cell.
  11. 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 charge state of an ith system cell in a target battery pack of an mth sampling period corresponding to a current time k and the display charge state of the ith system cell of an nth display period corresponding to the current time k, the current time k is the time before the end of the nth display period, I is a positive integer and is less than or equal to I, and I is the number of cells in the target battery pack;
    the first determining module is used for determining the change rate of the display charge state of the ith system cell in the (n+1) th display period according to the display charge state of the ith system cell in the (n) th display period, the actual charge state of the ith system cell in the (m) th sampling period and the change rate of the display charge state of the ith system cell in the (n) th display period;
    the second determining module is used for determining the display charge state of the (n+1) th display period of the (i) th system battery cell according to the change rate of the display charge state of the (i) th system battery cell of the (n+1) th display period, the reliability compensation coefficient and the display charge state of the (i) th system battery cell of the (n) th display period;
    And the third determining module is used for determining the display charge state of the target battery pack in the n+1th period according to the display charge state of each system cell in the target battery pack in the n+1th period.
  12. 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 1-10.
  13. 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 1-10.
  14. A readable storage medium having stored thereon a computer program which, when executed by a processor, performs the method of any of claims 1-10.
CN202180085512.0A 2021-09-26 2021-09-26 Method and device for determining and displaying state of charge and battery management chip Pending CN116635729A (en)

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JP2014048218A (en) * 2012-09-03 2014-03-17 Nissan Motor Co Ltd Vehicle display system and display method
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