CN105356535A - Function safety based total voltage processing method of battery management system - Google Patents
Function safety based total voltage processing method of battery management system Download PDFInfo
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- CN105356535A CN105356535A CN201510765043.3A CN201510765043A CN105356535A CN 105356535 A CN105356535 A CN 105356535A CN 201510765043 A CN201510765043 A CN 201510765043A CN 105356535 A CN105356535 A CN 105356535A
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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
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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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
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H02J7/0021—
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- 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
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Abstract
The invention discloses a function safety based total voltage processing method of a battery management system. The method comprises the steps that S1) the total voltage and each single voltage are collected in real time and transmitted to a control unit, and data stored when the battery management system is powered off last time is transmitted to the control unit; S2) whether collection of the total voltage is in failure is determined, if no, a step S3 is implemented, and otherwise a step S4 is implemented; S3) the total voltage collected in real time is output; S4) whether the single voltage collection function is normal is determined, if no, a step S5 is implemented, and if yes, a step S6 is implemented; S5) the effective data stored when the battery management system is powered off last time is output; S6) whether collection of single voltage is in failure is determined, if single voltage collection is not in failure or is only partially in failure, a step S7 is implemented, and if single voltage collection is totally in failure, a step S8) is implemented; S7) accumulation of the single voltages and the obtained total voltage are output; and S8) the effective data stored when the battery management system is powered off last time is output. The method can ensure that the charge state of batteries can be corrected and estimated accurately.
Description
Technical field
The present invention relates to a kind of battery management system total voltage processing method based on functional safety, belong to battery detection and management domain.
Background technology
Along with electronic technology infiltrates automotive field, automotive circuit diagram degree improves day by day, in addition hybrid vehicle and pure electric automobile add electrokinetic cell and high voltage control circuit system on the basis of orthodox car, and are undertaken controlling and estimating battery state-of-charge by battery management system.
Current Vehicular dynamic battery management system estimating battery electricity, mainly current according to battery basic status parameter, such as electric current, voltage, temperature etc., wherein electric current carries out electricity estimation by accumulative ampere-hour integration, and cause cumulative errors to become large due to current integration, usually all need to revise, topmost corrected parameter is that the linear relationship of electrokinetic cell voltage and battery charge state is carried out tabling look-up and revised.Because voltage acquisition there will be the problem such as outrange, data acquisition inefficacy under car load running status, cause carrying out correct correction.
Pure electric vehicle in the process of moving, in vibrations, high temperature, heavy current impact, overvoltage impact situation, occur that total voltage sampling wire harness loosens or the failure of removal such as hardware Acquisition Circuit open circuit, total voltage is caused to lose efficacy, and then affect battery charge state estimation, need to wait for that technical staff carries out failure diagnosis investigation to scene, waste time and energy, increase after-sales service cost.Battery management system treatment measures have two kinds of situations: the first, do not process, after total voltage collection is higher or on the low side, battery charge state is revised respectively to 100 and 0, revises cause to 100
mistakeuse battery, revise to 0 and cause using car load to stop; The second, does not adopt total voltage correction, battery charge state along with electric current scores accumulated error increasing, cause the unreasonable use of battery.
The consequence that above-mentioned situation causes is exactly: the unreasonable use of (1) battery causes cell degradation to aggravate, and car load cannot meet quality guarantee period; (2) car load abends, and causes personnel after sale frequently to arrive Solve on site problem.
The above problem is do not carry out more efficiently Diagnosis and management to this signal relevant to whole vehicle functions safety of total voltage after all.
Summary of the invention
The object of the present invention is to provide a kind of battery management system total voltage processing method based on functional safety, mainly solve existing problem of this signal relevant to whole vehicle functions safety of total voltage not being carried out to more efficiently Diagnosis and management.The signals such as the total voltage that the present invention utilizes electrokinetic cell to gather, monomer voltage, by corresponding Diagnosis and management measure, estimate rational power battery charged state correction total voltage, and then ensure that battery charge state revises estimation accurately.
To achieve these goals, the technical solution used in the present invention is as follows:
Based on a battery management system total voltage processing method for functional safety, comprise the steps:
The monomer voltage of S1, Real-time Collection total voltage and each cell is to control unit; The data that electricity under last time battery management system stores are passed to control unit simultaneously;
S2, judge whether total voltage collection lost efficacy, if do not lose efficacy, then perform S3, if lost efficacy, perform S4;
The total voltage of S3, output Real-time Collection;
S4, judge that monomer voltage acquisition function is whether normal, if abnormal, then perform step S5, if normally, then perform step S6;
The valid data that under S5, output battery management system last time, electricity stores;
S6, judge whether monomer voltage collection lost efficacy, if do not lose efficacy or only had partial failure, then perform step S7; If all lost efficacy, then performed step S8;
The total voltage that S7, output monomer voltage cumulative sum obtain;
The valid data that under S8, output battery management system last time, electricity stores.
Particularly, described step S2, the judgment principle whether total voltage collection lost efficacy is: if the total voltage gathered exceedes gather range or total voltage sample line open fault, then lost efficacy.
Further, described step S4, the judgment principle whether monomer voltage collection lost efficacy is: judge whether successively to lose efficacy to the monomer voltage of each cell, during judgement, if the monomer voltage gathered exceedes gather range or monomer voltage sample line open fault, then this monomer voltage lost efficacy, and continued to judge next monomer voltage, finally drew not inefficacy or partial failure or all lost efficacy.
Further, when monomer voltage did not lose efficacy or only had partial failure, in step S7, the computational methods that monomer voltage cumulative sum obtains total voltage are: sue for peace to all effective monomer voltages, obtain effective monomer voltage accumulation and, then effective monomer voltage is averaged, the cell voltage value of inefficacy is treated to effective monomer average voltage, finally obtain monomer voltage cumulative sum, i.e. total voltage.
Again further, in step S1, the data that under last time battery management system, electricity stores comprise: total voltage, maximum effective monomer voltage, minimum effective monomer voltage, effective monomer average voltage, monomer voltage cumulative sum, battery charge state, and after each collection exports, the Data Update stored by electricity under last time is this secondary data.
Again further, in step S5 and step S8, the valid data that under described output battery management system last time, electricity stores are total voltage value.
In addition, before execution step S5 and step S8, all to judge that whether store data lost efficacy, if lost efficacy, exported specified total voltage value, and was current time collection value by current storage Data Update.
Compared with prior art, the present invention has following beneficial effect:
The present invention is on existing battery management system basis, by making full use of software and hardware resources and being processed battery management system key signal by functional safety analysis, the different total voltage image data of two-way mutually verifies and processes, after any road image data breaks down, battery management system can carry out dynamic corrections process, by the total voltage related data that stores electricity under last time upper once power on after carry out checking treatment, battery charge state can carry out arbitration process to ensure that other algoritic modules use rational total voltage by total voltage by total voltage processing module to current system, its reasonability of abundant guarantee, fail safe and the reliability of battery management system are higher, battery management system has ensured the normal traveling of car load after going wrong, and makes personnel after sale no longer frequently investigate problem, ensure the accurate use of battery, fully can extend useful life.
Accompanying drawing explanation
fig. 1for the hardware of the present invention-embodiment gathers frame
figure.
fig. 2for the software systems frame of the present invention-embodiment
figure.
fig. 3for the present invention-embodiment total voltage acquisition processing module flow process
figure.
fig. 4for the present invention-embodiment total voltage crash handling block process
figure.
fig. 5for the present invention-embodiment monomer voltage acquisition processing module flow process
figure.
fig. 6for the present invention-embodiment monomer voltage crash handling block process
figure.
fig. 7for the present invention-embodiment stores data failure processing module flow process
figure.
fig. 8for the present invention-embodiment battery charge state can use total voltage processing module flow process
figure.
Embodiment
Below in conjunction with embodiment and
accompanying drawingthe invention will be further described, and embodiments of the present invention include but not limited to the following example.
Embodiment
as Fig. 1shown in, a kind of battery management system total voltage treatment system based on functional safety, hardware components comprises total voltage acquisition module, monomer voltage acquisition module, control unit, data memory module, total voltage acquisition module is connected with control unit with the output of monomer voltage acquisition module, and data memory module is connected with control unit.
as Fig. 2shown in, software section comprises:
1) total voltage acquisition processing module: gathering total voltage is original total voltage, obtains total voltage after filtering after filtering.
2) total voltage crash handling module: judge that the total voltage gathered exceedes and gather range or total voltage sample line open fault, then the electric magnitude of voltage stored under exporting battery management system last time.
3) monomer voltage acquisition processing module: gather monomer voltage original value, ask maximum effective monomer voltage, minimum effective monomer voltage, average effective monomer voltage, monomer voltage cumulative sum.
4) monomer voltage crash handling module: if control unit powers on and cannot gather monomer voltage or monomer voltage all lost efficacy, then adopt maximum effective monomer voltage, minimum effective monomer voltage and effective monomer average voltage that electricity under control unit last time stores; The monomer voltage gathered exceedes range or namely monomer voltage sample line open circuit judges to lose efficacy, be then treated to effective monomer average voltage to corresponding invalid cell voltage value.
5) data processing module is stored: the total voltage, maximum effective monomer voltage, minimum effective monomer voltage, effective monomer average voltage, monomer voltage cumulative sum, the battery charge state that are stored by electricity under last time; Each lower electric storage update is total voltage, maximum effective monomer voltage, minimum effective monomer voltage, effective monomer average voltage, monomer voltage cumulative sum, battery charge state when pre-treatment.
6) data failure processing module is stored: store data failure, be then updated to current time collection value to current stored value, now, battery charge state can be then specified total voltage by total voltage.
Battery charge state can use total voltage processing procedure: judge whether acquired original total voltage lost efficacy, if total voltage collection was not lost efficacy, adopt total voltage; Otherwise judge that whether monomer voltage acquisition function is effective, if invalid, the electric magnitude of voltage stored under then using battery management system last time, otherwise judge whether monomer voltage lost efficacy, do not lose efficacy and then adopted monomer voltage cumulative sum, if all lost efficacy, then the electric total voltage value stored under using battery management system last time; When the total voltage value using electricity under battery management system last time to store, also to judge that whether store data lost efficacy, if lost efficacy, exported specified total voltage value, and was current time collection value by current storage Data Update.
Based on a battery management system total voltage processing method for functional safety, comprise the steps:
1)
as Fig. 3shown in, the total voltage of acquired original is BatU0, is BatU1 to the total voltage of acquired original after carrying out filtering.
2)
as Fig. 4shown in, judging whether the total voltage BatU0 of acquired original exceedes collection upper limit BatUMax or lower limit BatUMin, total voltage sample line open fault flag bit BatULineOpen is 1, total voltage BatU2 assignment is then the total voltage CellBatU0 that under upper deuterzooid battery management system low pressure, electricity stores by any one establishment of above-mentioned 3 conditions (namely total voltage collection was lost efficacy), above-mentioned 3 conditions be all false (namely total voltage collection is effective) then assignment be filtered total voltage BatU1, filtering is carried out to BatU2 and obtains BatU3.
3)
as Fig. 5shown in, the monomer voltage CellU0 [n] of acquired original, wherein n is the monomer number that present battery management system gathers, CellU0 [n] is carried out whether each monomer voltage CellU [i] of n cycle criterion exceedes collection upper limit CellUMax or lower limit CellUMin, monomer voltage sample line open fault flag bit CellULineOpen [i] is 1, any one establishment of above-mentioned 3 conditions then adds 1 to m, above-mentioned three conditions are all false, and sue for peace, obtain effective monomer voltage accumulation and CellBatU to CellU [i]; Ask effective monomer average voltage, namely AverCellU0 is CellBatU/ (n-m), and the total voltage CellBatU0 of monomer voltage cumulative sum is AverCellU0*n; Bubbling method is adopted to try to achieve maximum effective monomer voltage MaxCellU0, minimum effective monomer voltage MinCellU0 to n-m the monomer do not lost efficacy.
4)
as Fig. 6shown in, first judge
fig. 5whether the inefficacy monomer number that middle monomer voltage acquisition processing module calculates is n, namely whole monomer voltage lost efficacy and maybe cannot gather, and was treated to monomer voltage CellU1 [i] the effective monomer average voltage AverCellUNVM1 that electricity under battery management system last time stores, maximum effective monomer voltage MaxCellU1 is the maximum effective monomer voltage MaxCellUNVM1 that under control unit last time, electricity stores, minimum effective monomer voltage MinCellU1 is the minimum effective monomer voltage MinCellUNVM1 that under last time, electricity stores, effective monomer average voltage AverCellU1 is the effective monomer average voltage AverCellUNVM1 that under last time, electricity stores, otherwise maximum effective monomer voltage, minimum effective monomer voltage, effective monomer average voltage adopt
fig. 5the value that monomer voltage acquisition processing module calculates is effective monomer average voltage AverCellU0 the monomer voltage assignment lost efficacy.
5)
as Fig. 7shown in, read effective monomer average voltage AverCellUNVM0, the maximum effective monomer voltage MaxCellUNVM0 that electricity under control unit last time stores, minimum effective monomer voltage MinCellUNVM0, total voltage BatUNVM0, battery charge state SOCNVM0.
6)
as Fig. 7shown in, store the non-failure state NVMSt of data and be not equal to 1, then export storing value, otherwise judge whether monomer voltage all lost efficacy, namely judge whether inefficacy monomer number m equals monomer populations n, if set up, to effective monomer average voltage AverCellUNVM1 assignment be
fig. 6collection value AverCellU1, maximum effective monomer voltage MaxCellUNVM1 assignment are
fig. 6collection value MaxCellU1, minimum effective monomer voltage MinCellNVM1 assignment are
fig. 6collection value MinCellU1, total voltage BatUNVM1 assignment are collection value CellBatU0, battery charge state SOCNVM1 assignment is
fig. 6collection value SOCNVM0; If judge the data failure of all storages, MaxCellUNVM1, MinCellNVM1, AverCellU1 are set to specified cell voltage value, and BatUNVM1 is set to specified total voltage value, battery charge state SOCNVM1 assignment appearance set point.
7)
as Fig. 8shown in, judging whether the total voltage BatU0 of acquired original exceedes collection upper limit BatUMax or lower limit BatUMin, total voltage sample line open fault flag bit BatULineOpen is 1, and above-mentioned 3 conditions are not all set up, and battery charge state can be BatU3 by total voltage BatUHld assignment; Otherwise judge that whether monomer voltage acquisition function is normal, if abnormal, then judge whether store status lost efficacy, if do not lose efficacy, battery charge state can be BatUNVM by total voltage BatUHld assignment, if lost efficacy, battery charge state can be specified total voltage value by total voltage BatUHld assignment.
If normal, then judge whether whole monomer voltage collection lost efficacy, and namely whether inefficacy monomer number m equals total monomer number n, if non-dead battery state-of-charge can be CellBatU0 by total voltage BatUHld assignment; Otherwise judge whether store status lost efficacy, if do not lose efficacy, battery charge state can be BatUNVM by total voltage BatUHld assignment, if dead battery state-of-charge can be specified total voltage value by total voltage BatUHld assignment.
If monomer voltage mean value, maximum, minimum value and total voltage storing value are stored in hardware different storage zone respectively, when total voltage and monomer voltage all lost efficacy, battery charge state can have 4 total voltages for subsequent use respectively by total voltage, that is: monomer voltage average storing value is multiplied by monomer number, monomer voltage maximum storing value is multiplied by monomer number, monomer voltage minimum value storing value is multiplied by monomer number, total voltage storing value.
According to above-described embodiment, just the present invention can be realized well.What deserves to be explained is; under prerequisite based on said structure design, for solving same technical problem, even if some making on the invention are without substantial change or polishing; the essence of the technical scheme adopted is still the same with the present invention, therefore it also should in protection scope of the present invention.
Claims (7)
1., based on a battery management system total voltage processing method for functional safety, it is characterized in that, comprise the steps:
The monomer voltage of S1, Real-time Collection total voltage and each cell is to control unit; The data that electricity under last time battery management system stores are passed to control unit simultaneously;
S2, judge whether total voltage collection lost efficacy, if do not lose efficacy, then perform S3, if lost efficacy, perform S4;
The total voltage of S3, output Real-time Collection;
S4, judge that monomer voltage acquisition function is whether normal, if abnormal, then perform step S5, if normally, then perform step S6;
The valid data that under S5, output battery management system last time, electricity stores;
S6, judge whether monomer voltage collection lost efficacy, if do not lose efficacy or only had partial failure, then perform step S7; If all lost efficacy, then performed step S8;
The total voltage that S7, output monomer voltage cumulative sum obtain;
The valid data that under S8, output battery management system last time, electricity stores.
2. a kind of battery management system total voltage processing method based on functional safety according to claim 1, it is characterized in that, described step S2, the judgment principle whether total voltage collection lost efficacy is: if the total voltage gathered exceedes gather range or total voltage sample line open fault, then lost efficacy.
3. a kind of battery management system total voltage processing method based on functional safety according to claim 1, it is characterized in that, described step S6, the judgment principle whether monomer voltage collection lost efficacy is: judge whether successively to lose efficacy to the monomer voltage of each cell, during judgement, if the monomer voltage gathered exceedes gather range or monomer voltage sample line open fault, then this monomer voltage lost efficacy, continue to judge next monomer voltage, finally draw not inefficacy or partial failure or all lost efficacy.
4. a kind of battery management system total voltage processing method based on functional safety according to claim 1 or 2 or 3, it is characterized in that, when monomer voltage did not lose efficacy or only had partial failure, in step S7, the computational methods that monomer voltage cumulative sum obtains total voltage are: sue for peace to all effective monomer voltages, obtain effective monomer voltage accumulation and, then effective monomer voltage is averaged, the cell voltage value of inefficacy is treated to effective monomer average voltage, finally obtain monomer voltage cumulative sum, i.e. total voltage.
5. a kind of battery management system total voltage processing method based on functional safety according to claim 1 or 2 or 3, it is characterized in that, in step S1, the data that under last time battery management system, electricity stores comprise: total voltage, maximum effective monomer voltage, minimum effective monomer voltage, effective monomer average voltage, monomer voltage cumulative sum, battery charge state, and after each collection exports, the Data Update stored by electricity under last time is this secondary data.
6. a kind of battery management system total voltage processing method based on functional safety according to claim 5, is characterized in that, in step S5 and step S8, the valid data that under described output battery management system last time, electricity stores are total voltage value.
7. a kind of battery management system total voltage processing method based on functional safety according to claim 6, it is characterized in that, before execution step S5 and step S8, also to judge whether store data lost efficacy, if lost efficacy, exported specified total voltage value, and be current time collection value by current storage Data Update.
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| CN106405314A (en) * | 2016-11-28 | 2017-02-15 | 成都雅骏新能源汽车科技股份有限公司 | Portable intelligent battery pack sampling wiring harness test system |
| CN109541481A (en) * | 2017-09-22 | 2019-03-29 | 郑州宇通客车股份有限公司 | A kind of voltage estimate, management method and the system of used in new energy vehicles battery pack |
| CN111273176A (en) * | 2018-12-05 | 2020-06-12 | 宁德时代新能源科技股份有限公司 | Fault diagnosis optimization method, device, system and storage medium |
| CN111487542A (en) * | 2020-04-27 | 2020-08-04 | 力高(山东)新能源技术有限公司 | Method for calculating SOC (State of Charge) of battery management system of new energy automobile |
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