CN106501734B - The voltage acquisition fault handling method and device of battery management system - Google Patents
The voltage acquisition fault handling method and device of battery management system Download PDFInfo
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- CN106501734B CN106501734B CN201611241879.4A CN201611241879A CN106501734B CN 106501734 B CN106501734 B CN 106501734B CN 201611241879 A CN201611241879 A CN 201611241879A CN 106501734 B CN106501734 B CN 106501734B
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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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
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Abstract
The present invention discloses a kind of voltage acquisition fault handling method of battery management system, comprising: obtains the average current that battery output in for the previous period occurs in failure；Obtain the first battery remaining power that the moment occurs for failure；Second battery remaining power at current time is calculated；The ratio for calculating the second battery remaining power and rated cell capacity obtains the virtual battery remaining capacity at current time；The virtual battery voltage at current time is obtained according to SOC and voltage mapping relations using virtual battery remaining capacity；Using the value of virtual battery voltage as the acquisition data of battery management system.The present invention provides the voltage acquisition fault handling method and device of a kind of battery management system, and battery management system is made still can to carry out battery management work during voltage acquisition failure.
Description
Technical field
The present invention relates to the voltage acquisition troubleshootings of technical field of battery management more particularly to a kind of battery management system
Method and device.
Background technique
As new-energy automobile is using more and more extensive, requirement of the people to its safety and comfort is also increasingly
It is high.Battery is the core of electric car, so battery management system (BATTERY MANAGEMENT SYSTEM, abbreviation BMS) is just
It is particularly important.
BMS is the tie between battery and user, and main object is secondary cell.Secondary cell some is lacked there are following
Point, such as storage energy is few, the service life is short, in series and parallel using problem, safety in utilization, battery capacity estimation difficulty.The property of battery
Can be it is very complicated, different types of battery behavior also differs greatly.BMS mainly aims at the utilization that can be improved battery
Rate prevents battery from occurring overcharging and over-discharge, extends the service life of battery, monitor the state of battery.With battery
The development of management system can also increase other functions.
BMS is responsible for acquiring the voltage or current information of battery, and is carried out according to collected voltage or current information
The various problems generated in battery charging and discharging control and treatment of battery use process.Common problem includes: starting, battery
Alarm, current limliting, limit power, disconnection battery power etc..Once the monomer voltage acquisition module of BMS goes wrong, BMS can not be acquired
To the voltage or current information of battery, BMS will can not carry out battery management function because of losing according to.Then, BMS meeting
It is defaulted as cell power systems failure, then cuts off cell power systems at once.There is a continuing need for until acquisition module work normally,
The voltage or current information of battery can be reacquired, BMS can just allow to restore cell power systems.This disadvantage is:
For the voltage acquisition failure that can restore in the short time, it is equivalent to automobile and runs out of steam suddenly, it is then in a period of time and prominent
Power so is regained, be easy to cause the Psychological phobia of user, user experience effect is very poor, is also unfavorable for the steady row of automobile
It sails.
Summary of the invention
It is an object of the present invention to: a kind of voltage acquisition fault handling method of battery management system is provided, electricity is made
Pond management system still can carry out battery management work during voltage acquisition failure.
It is another object of the present invention to: a kind of voltage acquisition fault treating apparatus of battery management system is provided, is made
Battery management system still can carry out battery management work during voltage acquisition failure.
To achieve this purpose, the present invention adopts the following technical scheme:
On the one hand, a kind of voltage acquisition fault handling method of battery management system is provided, comprising:
Obtain the average current that battery output in for the previous period occurs in failure；
Obtain the first battery remaining power that the moment occurs for failure；
According to average current, trouble duration and the first battery remaining power, second electricity at current time is calculated
Pond residual capacity；
The ratio for calculating the second battery remaining power and rated cell capacity obtains the remaining electricity of virtual battery at current time
Amount；
The virtual battery electricity at current time is obtained according to SOC and voltage mapping relations using virtual battery remaining capacity
Pressure；
Using the value of virtual battery voltage as the acquisition data of battery management system.
As a preferred embodiment, the average current for obtaining failure and battery output in for the previous period occur
Include:
Record the transient current of battery output in a period of time；
Read the transient current that battery output in for the previous period occurs in recorded, failure；
The average value that the transient current of battery output in for the previous period occurs in failure is calculated, as average current.
Preferably, the average value of the electric current of battery output in 25s, 30s or 35s before failure occurs is obtained as average electricity
Stream.
Specifically, the average current I that battery output in for the previous period occurs in failure is obtained from buffer storage.
Further, the second battery remaining power=the first battery remaining power-average current × trouble duration.
Specifically, the trouble duration is the absolute value of the difference at current time and failure generation moment.
As a preferred embodiment, described use virtual battery remaining capacity, closed according to SOC and voltage mapping
System, the virtual battery voltage for obtaining current time include:
SOC and voltage mapping relations are inputted into battery management system；
Virtual battery remaining capacity is substituted into the SOC and voltage mapping relations, obtains virtual battery voltage.
As a preferred embodiment, further include,
Judge whether trouble duration reaches the fault time upper limit；
If so, reporting fault, disconnects cell power systems.
On the other hand, a kind of voltage acquisition fault treating apparatus of battery management system is provided, comprising:
Average current obtains module, the average current of battery output in for the previous period occurs for obtaining failure；
First battery remaining power obtains module, and first battery remaining power at moment occurs for obtaining failure；
Second battery remaining power computing module, for according to average current, trouble duration and the first remaining battery
Second battery remaining power at current time is calculated in capacity；
Virtual battery remaining capacity computing module, for calculating the ratio of the second battery remaining power and rated cell capacity
Value, obtains the virtual battery remaining capacity at current time；
Virtual battery voltage obtains module, for using virtual battery remaining capacity, according to SOC and voltage mapping relations,
Obtain the virtual battery voltage at current time；
Acquisition module, for using the value of virtual battery voltage as the acquisition data of battery management system.
As a preferred embodiment, the average current acquisition module includes:
Electric current memory module, for recording the transient current that battery exports in a period of time；
There is the instantaneous electricity of battery output in for the previous period for reading recorded, failure in electric current read module
Stream；
There is the average value of the transient current of battery output in for the previous period for calculating failure in current operator module,
As average current.
As a preferred embodiment, the second battery remaining power computing module is specifically used for calculating:
Second battery remaining power=the first battery remaining power-average current × trouble duration calculates the second battery
Residual capacity.
As a preferred embodiment, the virtual battery voltage acquisition module includes:
Input module is mapped, for SOC and voltage mapping relations to be inputted battery management system；
Mapping memory module, for storing SOC and voltage mapping relations；
Mapping substitutes into module, for virtual battery remaining capacity to be substituted into the SOC and voltage mapping relations, obtains virtual
Cell voltage.
As a preferred embodiment, further including judgment module, it is used for:
Judge whether trouble duration reaches the fault time upper limit；
If so, reporting fault, disconnects cell power systems.
The invention has the benefit that the voltage acquisition fault handling method and device of a kind of battery management system are provided,
When voltage acquisition failure occurs, using virtual battery voltage as collected voltage data, and then guarantee battery management system
Battery management work still can be carried out in voltage acquisition failure, promoted automobilism and obtained stationarity and improve user experience effect
Fruit.
Detailed description of the invention
The present invention will be further described in detail below based on the drawings and embodiments.
Fig. 1 is the method block diagram of BMS voltage acquisition fault handling method described in embodiment one.
Specific embodiment
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
Embodiment one
The present embodiment provides a kind of processing methods of BMS voltage acquisition failure, comprising:
S10: judge whether BMS voltage acquisition is abnormal；
If so, executing S20；
If it is not, then returning to S10.
Specifically, voltage acquisition is monitored always in BMS, once voltage acquisition goes wrong, such as collected
Voltage data is obvious abnormal or can not collect voltage data, then it is assumed that BMS voltage acquisition is abnormal.Such as it can be said that
General collected battery cell voltage data are between 2.5V~3.65V, according to test data, are manually set normal fair
Perhaps variation range is 2V~5V, if collecting voltage data suddenly is 1V or 6V, be can be determined that as the generation of BMS voltage acquisition
It is abnormal, then execute S20.If collected data are constantly in normal permission variation range, S10 is continuously carried out, to electricity
Pressure acquisition carries out lasting real time monitoring.
S20: the average current that battery output in for the previous period occurs in failure is obtained；
Wherein, the S20 includes:
S201: the transient current of battery output in record a period of time；
S202: the transient current that battery output in for the previous period occurs in recorded, failure is read；
S203: the average value that the transient current of battery output in for the previous period occurs in failure is calculated, as average current.
Specifically, within a certain period of time, if there is no too big variation, the electric currents of battery output for the load of automobile
It is also metastable.So in this present embodiment, it is assumed that electricity before the electric current and failure that battery exports during failure occurs occur
The electric current of pond output is identical.
For example, battery work when, BMS always in real time to battery output electric current be monitored, and to each acquisition when
The transient current at quarter is recorded.In 8:00:30, voltage acquisition breaks down, then BMS is just from recorded transient current
The middle transient current read in 8:00:00~8:00:30 period, and average to the transient current in the period, then
Average current can be acquired.In this present embodiment, using average current as the output electric current of battery during voltage acquisition failure.Yu Ben
In embodiment, the average value 250A of the electric current of battery output in 30s before failure occurs is obtained as average current.In other implementations
In example, also available 8:00:00~8:00:25,8:00:10~8:00:30 or in 8:00:00~8:00:35 period
The average value of the electric current of battery output is as average current.
S30: the first battery remaining power that the moment occurs for failure is obtained；
Specifically, BMS carries out real-time monitoring to the battery remaining power of battery (State of Charge, i.e. SOC) always
And record then reads the data of record when voltage acquisition module breaks down, and by remaining battery at the time of breaking down
Capacity is as the first battery remaining power.
For example, battery remaining power 10kwh, then the first remaining battery holds when voltage acquisition module breaks down
Amount=10kwh.
S40: according to average current, trouble duration and the first battery remaining power, the of current time is calculated
Two battery remaining powers.
Specifically, the second battery remaining power=the first battery remaining power-average current × trouble duration.Its
In, the trouble duration is the absolute value of the difference at current time and failure generation moment.
For example, at the 8:00:35 moment, trouble duration 5s, the second battery remaining power=10000wh-250A
× 5s=10000wh-250 × 5/3600wh=9999.66wh
S50: calculating the ratio of the second battery remaining power and rated cell capacity, and the virtual battery for obtaining current time is surplus
Remaining electricity；
Specifically, in this present embodiment, rated cell capacity 16kwh.Then the virtual battery at 8:00:35 moment is remaining
Electricity=9999.66wh/16kwh ≈ 0.625=62.5%.
S60: virtual battery remaining capacity is used, according to the mapping between measured battery remaining capacity and measured battery voltage
Relationship obtains the virtual battery voltage at current time；
Further, the S60 is specifically included:
S601: SOC and voltage mapping relations are inputted into battery management system；
S602: virtual battery remaining capacity is substituted into the SOC and voltage mapping relations, obtains virtual battery voltage.
Specifically, when battery works under different remaining capacities, voltage is also different, therefore, the residue of battery
There are certain mapping relations between electricity and cell voltage.Accordingly, when carrying out design, production, the debugging etc. of battery, so that it may
To measure the mapping relations between the remaining capacity of battery and cell voltage, abbreviation SOC and voltage mapping relations.In the present embodiment
In, table, referred to as SOC voltmeter is made in SOC and voltage mapping relations.In other embodiments, SOC and voltage mapping are closed
System is expressed as the forms such as curve graph or fitting function.
In S50, the virtual battery remaining capacity for having acquired the 8:00:35 moment is 54.69%, according to SOC voltmeter
It is recognised that when the remaining capacity of battery is 54.69%, battery cell voltage 3.25V, using this as the 8:00:35 moment
Virtual battery voltage.
In this present embodiment, work as hair i.e. being stored in SOC and voltage mapping relations input BMS before automobile factory
When raw voltage acquisition failure, then SOC and voltage mapping relations are read from BMS, and will be described in the substitution of virtual battery remaining capacity
SOC and voltage mapping relations, obtain virtual battery voltage.
S70: using the value of virtual battery voltage as the acquisition data of battery management system.
Specifically, due to can not collection voltages data, so BMS just can not carry out battery management operation.The present embodiment
The virtual battery voltage that the 8:00:35 moment is acquired in S60 is 3.25V, using 3.25V as the battery at 8:00:35 moment
Voltage is supplied to BMS, then BMS can continue to execute battery management operation, not will lead to cell power systems and disconnects suddenly.
According to the processing method in the present embodiment, so that it may which other moment when occurring for voltage acquisition failure provide virtually
Cell voltage, and then guarantee that BMS continues to execute battery management operation, prevent cell power systems from disconnecting suddenly.
S80: judge whether trouble duration reaches the fault time upper limit；
If so, reporting fault, disconnects cell power systems；
If it is not, then returning to S10.
Specifically, voltage acquisition fault handling method described in the present embodiment can be used for the event of the voltage acquisition in the short time
Barrier should disconnect cell power systems if there is voltage acquisition failure for a long time, check failure cause.
Further, it is found by repetition test, it is more appropriate that the fault time upper limit is set as 8s~12s, especially will
It is the most suitable that the fault time upper limit is set as 10s.It causes user experience to be deteriorated so set, being not only unlikely to too short-range missile, but also is unlikely to too
Length leads to BMS system damage.
Embodiment two
A kind of voltage acquisition fault treating apparatus of battery management system, comprising: average current obtains module, the first battery
Residual capacity obtains module, the second battery remaining power computing module, virtual battery remaining capacity computing module, virtual battery electricity
Pressure obtains module and acquisition module.
Average current obtains module, the average current of battery output in for the previous period occurs for obtaining failure.Into one
Step ground, it includes: electric current memory module that the average current, which obtains module, for recording the instantaneous electricity that battery exports in a period of time
Stream；There is the transient current of battery output in for the previous period for reading recorded, failure in electric current read module；Electricity
Computing module is flowed, the average value of the transient current of battery output in for the previous period occurs for calculating failure, as average electricity
Stream.
First battery remaining power obtains module, and first battery remaining power at moment occurs for obtaining failure.
Second battery remaining power computing module, for according to average current, trouble duration and the first remaining battery
Capacity, according to:
Second battery remaining power=the first battery remaining power-average current × trouble duration calculates the second battery
Residual capacity
Second battery remaining power at current time is calculated.
Virtual battery remaining capacity computing module, for calculating the ratio of the second battery remaining power and rated cell capacity
Value, obtains the virtual battery remaining capacity at current time.
Virtual battery voltage obtains module, for using virtual battery remaining capacity, according to SOC and voltage mapping relations,
Obtain the virtual battery voltage at current time.Wherein, it includes: mapping input module that the virtual battery voltage, which obtains module, is used
In SOC and voltage mapping relations are inputted battery management system；Mapping memory module, for storing SOC and voltage mapping relations；
Mapping substitutes into module, for virtual battery remaining capacity to be substituted into the SOC and voltage mapping relations, obtains virtual battery electricity
Pressure.
Acquisition module, for using the value of virtual battery voltage as the acquisition data of battery management system.
It can also include judgment module, when for judging whether trouble duration reaches failure in other embodiments
Between the upper limit；
If so, reporting fault, disconnects cell power systems；
Judge whether BMS voltage acquisition is abnormal if it is not, then returning.
" first " herein, " second " have no special meaning just for the sake of being distinguish in description.
It is to be understood that above-mentioned specific embodiment is only that presently preferred embodiments of the present invention and institute's application technology are former
Reason, within the technical scope of the present disclosure, variation that anyone skilled in the art is readily apparent that or
Replacement, should be covered by the scope of protection of the present invention.
Claims (10)
1. a kind of voltage acquisition fault handling method of battery management system characterized by comprising
Obtain the average current that battery output in for the previous period occurs in voltage acquisition failure；
Obtain the first battery remaining power that the moment occurs for voltage acquisition failure；
According to average current, voltage acquisition trouble duration and the first battery remaining power, the of current time is calculated
Two battery remaining powers；
The ratio for calculating the second battery remaining power and rated cell capacity obtains the virtual battery remaining capacity at current time；
The virtual battery voltage at current time is obtained according to SOC and voltage mapping relations using virtual battery remaining capacity；
Using the value of virtual battery voltage as the acquisition data of battery management system.
2. the voltage acquisition fault handling method of battery management system according to claim 1, which is characterized in that described to obtain
Take voltage acquisition failure occur for the previous period in battery output average current include:
Record the transient current of battery output in a period of time；
Read the transient current that battery output in for the previous period occurs in recorded, voltage acquisition failure；
The average value that the transient current of battery output in for the previous period occurs in voltage acquisition failure is calculated, as average current.
3. the voltage acquisition fault handling method of battery management system according to claim 1, it is characterised in that:
Second battery remaining power=the first battery remaining power-average current × voltage acquisition trouble duration.
4. the voltage acquisition fault handling method of battery management system according to claim 1, which is characterized in that described to make
With virtual battery remaining capacity, according to SOC and voltage mapping relations, the virtual battery voltage for obtaining current time includes:
SOC and voltage mapping relations are inputted into battery management system；
Virtual battery remaining capacity is substituted into the SOC and voltage mapping relations, obtains virtual battery voltage.
5. the voltage acquisition fault handling method of battery management system according to claim 1, which is characterized in that also wrap
It includes,
Judge whether voltage acquisition trouble duration reaches the voltage acquisition fault time upper limit；
If so, reporting voltage acquisition failure, cell power systems are disconnected.
6. a kind of voltage acquisition fault treating apparatus of battery management system characterized by comprising
Average current obtains module, the average current of battery output in for the previous period occurs for obtaining voltage acquisition failure；
First battery remaining power obtains module, and first battery remaining power at moment occurs for obtaining voltage acquisition failure；
Second battery remaining power computing module, for according to average current, voltage acquisition trouble duration and the first battery
Second battery remaining power at current time is calculated in residual capacity；
Virtual battery remaining capacity computing module is obtained for calculating the ratio of the second battery remaining power and rated cell capacity
To the virtual battery remaining capacity at current time；
Virtual battery voltage obtains module, for being obtained using virtual battery remaining capacity according to SOC and voltage mapping relations
The virtual battery voltage at current time；
Acquisition module, for using the value of virtual battery voltage as the acquisition data of battery management system.
7. the voltage acquisition fault treating apparatus of battery management system according to claim 6, which is characterized in that described flat
Equal electric current obtains module
Electric current memory module, for recording the transient current that battery exports in a period of time；
There is the wink of battery output in for the previous period for reading recorded, voltage acquisition failure in electric current read module
When electric current；
Current operator module, for calculating being averaged for the voltage acquisition failure appearance transient current that interior battery exports for the previous period
Value, as average current.
8. the voltage acquisition fault treating apparatus of battery management system according to claim 6, which is characterized in that described
Two battery remaining power computing modules are specifically used for calculating:
Second battery remaining power=the first battery remaining power-average current × voltage acquisition trouble duration calculates second
Battery remaining power.
9. the voltage acquisition fault treating apparatus of battery management system according to claim 6, which is characterized in that the void
Quasi- cell voltage obtains module
Input module is mapped, for SOC and voltage mapping relations to be inputted battery management system；
Mapping memory module, for storing SOC and voltage mapping relations；
Mapping substitutes into module, for virtual battery remaining capacity to be substituted into the SOC and voltage mapping relations, obtains virtual battery
Voltage.
10. the voltage acquisition fault treating apparatus of battery management system according to claim 6, which is characterized in that also wrap
Judgment module is included, is used for:
Judge whether voltage acquisition trouble duration reaches the voltage acquisition fault time upper limit；
If so, reporting voltage acquisition failure, cell power systems are disconnected.
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| CN110501597A (en) * | 2019-09-03 | 2019-11-26 | 广州小鹏汽车科技有限公司 | Electric car and the detection circuit for BMS, method and system |
| CN113049968B (en) * | 2021-03-11 | 2023-11-14 | 北京字节跳动网络技术有限公司 | Method, device, electronic equipment and storage medium for determining average current of battery |
| CN113296013B (en) * | 2021-05-25 | 2023-03-24 | 中国电子科技集团公司第十八研究所 | Support monomer voltage acquisition circuit of arbitrary section battery series connection |
| CN113472042A (en) * | 2021-07-02 | 2021-10-01 | 深圳市普渡科技有限公司 | Battery power mapping, battery charging control system, battery charging control method, robot and medium |
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| JP2011142036A (en) * | 2010-01-08 | 2011-07-21 | Sanyo Electric Co Ltd | Battery control method and electronic equipment |
| CN102540081B (en) * | 2010-12-29 | 2015-01-21 | 上海汽车集团股份有限公司 | Method for determining charge state of vehicle-mounted storage battery |
| CN103226184B (en) * | 2013-03-20 | 2015-09-02 | 东莞宇龙通信科技有限公司 | The method of battery information and many battery terminal is obtained in many battery terminal |
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