CN108931725A - A kind of method and device of battery failures detection - Google Patents
A kind of method and device of battery failures detection Download PDFInfo
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- CN108931725A CN108931725A CN201710384131.8A CN201710384131A CN108931725A CN 108931725 A CN108931725 A CN 108931725A CN 201710384131 A CN201710384131 A CN 201710384131A CN 108931725 A CN108931725 A CN 108931725A
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Abstract
The embodiment of the invention discloses a kind of battery failures detection method and device, the method includes：When the inconsistent failure of monomer voltage occurs for mesuring battary group, first difference of the sum of monomer voltage of each single battery that the total voltage of mesuring battary group and mesuring battary group include is determined；Before the inconsistent failure of monomer voltage occurs for mesuring battary group, the second difference of the sum of the total voltage of mesuring battary group and the monomer voltage of each single battery is determined；If the difference of the first difference and the second difference is greater than predetermined voltage threshold, it is determined that voltage measurement failure occurs in mesuring battary group；Otherwise according to the difference voltage of each single battery, determine that short trouble or contact resistance failure occurs in mesuring battary group；Wherein, the difference voltage of any single battery is the difference of the monomer voltage of the single battery and the monomer voltage average value of each single battery.Using the embodiment of the present invention, there is the advantages of accuracy that battery failures detection can be improved, the applicability of enhancing battery failures detection.
Description
Technical field
The present invention relates to the method and devices that field of battery management more particularly to a kind of battery failures detect.
Background technique
Currently increasingly sharpening with environmental problems such as haze weather, greenhouse effects, energy crises, the sustainable development of people
Exhibition consciousness is gradually increased, and the sustainable energies product such as electric car also becomes increasingly popular.The energy storage device of electric car is electricity
Cell system, main includes battery cell or the integrated of battery module, battery management system, high low pressure circuit and cooling device
Etc. modules.In recent years, the safety accidents such as a lot of electric car spontaneous combustions have occurred both at home and abroad, the safety accidents such as electric car spontaneous combustion are more
Caused by the failure of battery system.The battery system of electric car is likely to occur the battery cell voltage of burst in the process of running
The voltage of the failures such as inconsistent, the i.e. voltage of some battery cell and other battery cells occurs apparent inconsistent.It causes to dash forward
The reason of electricity pond monomer voltage inconsistent equal battery failures have it is multiple, if user can not determine that the failure of battery system is former
Cause then can not solve failure using corresponding measure, and then not can avoid battery failures and bring the safe thing such as electric car spontaneous combustion
Therefore.
The prior art is by acquiring or monitoring the end voltage of each single battery in battery system, electromotive force, monomer electricity
Perhaps the battery parameters such as equivalent internal resistance of single battery pass through the battery parameter that acquires or monitor and pre- to the output electric current in pond
The standard parameter of definition is compared, and determines whether battery system breaks down by the comparison of parameter.For example, the prior art is logical
Cross the end voltage U of each single battery in acquisition secondary batteryiAnd the output electric current I of single battery, calculate each monomer
The equivalent internal resistance Z of batteryi, and pass through ZiWith the difference DELTA Z of reference resistanceiDetermine whether single battery micro-short circuit occurs.Wherein,
Reference resistance is the average value of the equivalent internal resistance of all single batteries in battery pack.If the number of concatenated single battery in battery pack
Measure it is more, then the prior art acquire or monitor each single battery battery parameter heavy workload, realize difficulty it is big.This
Outside, with the aging of battery pack, the inconsistency of each single battery be will increase in battery pack, with Δ ZiThe battery parameters such as value are sentenced
It is easy for the inconsistency of battery to be judged as micro-short circuit when powering off pond micro-short circuit, and being easy will be caused by the failure such as contact resistance
Internal resistance variation wrong report is micro-short circuit, and probability of miscarriage of justice is high.Battery failures caused by different reasons, applicability cannot be distinguished in the prior art
Difference.
Summary of the invention
The application provides a kind of method and device of battery failures detection, and the detection that battery failures source can be improved is accurate
Property, the applicability of enhancing battery failures detection reduces the False Rate of battery failures.
First aspect provides a kind of method of battery failures detection, may include：
When the inconsistent failure of monomer voltage occurs for mesuring battary group, determine the mesuring battary group total voltage and it is described to
Survey first difference of the sum of monomer voltage of each single battery that battery pack includes；
Before the inconsistent failure of monomer voltage occurs for the mesuring battary group, determine the total voltage of the mesuring battary group with
Second difference of the sum of the monomer voltage of each single battery；
If the difference of first difference and second difference is greater than predetermined voltage threshold, it is determined that the mesuring battary
There is voltage measurement failure in group；
If the difference of first difference and second difference is less than or equal to the predetermined voltage threshold, basis
The difference voltage of each single battery determines that short trouble or contact resistance failure occurs in the mesuring battary group；
Wherein, the difference voltage of any single battery is the monomer voltage and each monomer of any single battery
The difference of the monomer voltage average value of battery.
It should be noted that the inconsistent failure of monomer voltage described herein refers to some monomer electricity in battery pack
There is apparent inconsistent caused battery failure in the voltage (i.e. monomer voltage) in pond and the voltage of other monomers battery.
The application can be in the inconsistent failure of the generation monomer voltage of the single battery in mesuring battary group, according to mesuring battary
The total voltage of group and the monomer voltage of each single battery determine whether the reason of mesuring battary group breaks down is voltage measurement
Failure.It, can also be according to the difference electricity of each single battery if the reason of mesuring battary group breaks down is not voltage measurement failure
It presses and determines that the source of failure of mesuring battary group is short trouble or contact resistance failure.The application can realize mesuring battary group
The accuracy of the detection in battery failures source can be improved in the first diagnosis of the source of failure, improves the applicability of battery failures detection,
And then the safety of battery can be improved.
With reference to first aspect, in the first possible implementation, the method also includes：
Obtain the monomer of each single battery each sampling instant in presetting N number of sampling instant in the mesuring battary group
Voltage；
Determine the difference voltage of each single battery described in each sampling instant, and according to the difference of each single battery
Different voltage determines that the inconsistent failure of monomer voltage occurs for the mesuring battary group；
Wherein, the N is the integer greater than zero.
The application can be by acquiring monomer voltage of the single battery in multiple sampling instants of mesuring battary group, and then can be true
The difference voltage of fixed each each single battery of sampling instant.It can determine that mesuring battary group is sent out according to the difference voltage of single battery
The inconsistent failure of monomer voltage has been given birth to, the detection accuracy of the inconsistent failure of mesuring battary group monomer voltage, Jin Erke can be improved
The timeliness for improving battery failures detection, improves the controllability of battery failures risk.
The first possible implementation with reference to first aspect, in the second possible implementation, the determination is each
The difference voltage of each single battery described in a sampling instant, and according to the determination of the difference voltage of each single battery
The inconsistent failure of monomer voltage occurs for mesuring battary group：
Each single battery in the mesuring battary group is obtained in the monomer voltage of any sampling instant k, and described in calculating
The average value U of the monomer voltage of each single battery described in sampling instant km；
According to each single battery the sampling instant k monomer voltage and the UmDifference determine described in
The difference voltage of each single battery, and the difference voltage of the single battery i of difference voltage maximum absolute value is determined as described
The maximum antipode voltage U of sampling instant kDmax, i；
If the U of continuous a sampling instant record of N 'Dmax, iGreater than default difference voltage threshold value, it is determined that be greater than at first
The U of default difference voltage threshold valueDmax, iThe inconsistent failure of monomer voltage has occurred in mesuring battary group described in the sampling instant m of appearance；
Wherein, N ' is the integer less than or equal to N.
The application can preset the difference voltage threshold value of the inconsistent failure of monomer voltage for determining battery pack, may be used also
Record the maximum antipode voltage of each sampling instant.According to the maximum antipode voltage of each sampling instant and default poor
Different voltage threshold can determine the inconsistent sampling instant of monomer voltage occur, and then can examine the source of battery failure in time, mention
The timeliness of high detection fault detection improves the safety of battery.
Second of possible implementation with reference to first aspect, in the third possible implementation, the electricity to be measured
When the inconsistent failure of monomer voltage occurs for pond group, determines the total voltage of the mesuring battary group and the mesuring battary group includes
First difference of the sum of the monomer voltage of each single battery includes：
When determining that the sampling instant m of the inconsistent failure of monomer voltage occurs for the mesuring battary group, and obtaining the sampling
Carve the total voltage U of mesuring battary group described in mtotal1；
The monomer voltage for each single battery that mesuring battary group described in the sampling instant m includes is obtained, and calculates institute
State the sum of the monomer voltage of each single battery U1；
Calculate the Utotal1With the U1Difference, and the absolute value of the difference is determined as first difference.
The application can determine that the sampling instant of the inconsistent failure of monomer voltage occurs for battery pack, and then when can determine the sampling
The sum of the monomer voltage of the total voltage of battery pack and each single battery of battery pack is carved, and then can be true by the difference of the two
It is set to the first difference, for determining the fault type of battery pack.The monomer electricity of battery failures can occur according to battery pack in the application
It presses corresponding battery parameter at the time of inconsistency to determine battery failure source, the False Rate of detection fault detection can be reduced,
Improve the applicability of battery failure source detection.
Second of possible implementation with reference to first aspect, in the fourth possible implementation, the electricity to be measured
Before the inconsistent failure of monomer voltage occurs for pond group, determine the mesuring battary group total voltage and each single battery
Second difference of the sum of monomer voltage includes：
When determining that the sampling instant m of the inconsistent failure of monomer voltage occurs for the mesuring battary group, and obtaining the sampling
The total voltage U of mesuring battary group described in sampling instant m1 before quarter mtotal2；
The monomer voltage for each single battery that mesuring battary group described in the sampling instant m1 includes is obtained, and calculates institute
State the sum of the monomer voltage of each single battery U2；
Calculate the Utotal2With the U2Difference, and the absolute value of the difference is determined as second difference.
The application can determine that the sampling instant of the inconsistent failure of monomer voltage occurs for battery pack, and then when can determine the sampling
Carve previous sampling instant battery pack total voltage and battery pack each single battery monomer voltage sum, into
And the difference of the two can be determined as to the second difference, for determining the fault type of battery pack.The application can go out according to battery pack
The corresponding battery parameter of sampling instant before at the time of the monomer voltage inconsistency of existing battery failures determines battery failure
The selection flexibility in source, sampling instant is high, can reduce the False Rate of detection fault detection, improves the detection of battery failure source
Applicability.
The 4th kind of possible implementation of the third possible implementation or first aspect with reference to first aspect,
It is described after the inconsistent failure of monomer voltage has occurred in the determination mesuring battary group in five kinds of possible implementations
Method further includes：
Determine the voltage jump value that the inconsistent single battery of voltage occurs in the mesuring battary group, and according to the electricity
Pressure mutation value determines the predetermined voltage threshold；
Wherein, the voltage jump value is the sampling of the inconsistent single battery of the generation voltage before the failure occurs
The monomer voltage difference of sampling instant after moment and failure generation.
The voltage jump value of single battery when the inconsistent failure of single battery can occur according to battery pack for the application, determines
For determining that the parameter of voltage measurement failure occurs for battery, the accuracy of parameter selection can be improved, and then battery pack event can be reduced
Hinder the False Rate of detection.
Second of possible implementation is any into the 5th kind of possible implementation of first aspect with reference to first aspect
Kind, in a sixth possible implementation, the difference voltage according to each single battery determines the electricity to be measured
There is short trouble in pond group or contact resistance failure includes：
It determines that the sampling instant m of the inconsistent failure of monomer voltage occurs for the mesuring battary group, calculates the sampling instant m
First average absolute difference value U of the maximum antipode voltage of x1 sampling instant beforeMAD1；
Calculate the second mean absolute difference of the maximum antipode voltage of x2 sampling instant after the sampling instant m
Score value UMAD2, wherein the x2=x1=x, the x are more than or equal to (N-1)/2；
If the UMAD2More than or equal to the UMAD2Presupposition multiple threshold value, it is determined that the mesuring battary group occurs
Otherwise contact resistance failure determines that short trouble occurs in the mesuring battary group；
Wherein, average absolute difference value UMADCalculation expression be：
Wherein, Udmax,i(t)For the maximum antipode voltage of sampling instant t.
The application can record respectively event after determining the inconsistent failure of monomer voltage that single battery occurs for battery pack
Multiple maximum antipode voltages of barrier front and back, and then can determine that battery pack breaks down the maximum antipode voltage of front and back
Average absolute difference value.The application can be compared by the size of the average absolute difference value before and after battery failure and determine battery pack
Failure is short trouble or contact resistance failure, to fast implement examining for the batteries monomer voltage inconsistency source of failure
It is disconnected, improve the applicability of battery failure detection.
Second aspect provides a kind of device of battery failures detection, may include：
Determining module, for determining the mesuring battary group in the inconsistent failure of mesuring battary group generation monomer voltage
Total voltage and the sum of the mesuring battary group monomer voltage of each single battery that includes the first difference；
The determining module is also used to before the inconsistent failure of monomer voltage occurs for the mesuring battary group, determines institute
State the second difference of the sum of the total voltage of mesuring battary group and the monomer voltage of each single battery；
Failure analysis module, for determining that the difference of first difference and second difference is big in the determining module
When predetermined voltage threshold, determine that voltage measurement failure occurs in the mesuring battary group；
The failure analysis module is also used to determine first difference and second difference in the determining module
When difference is less than or equal to the predetermined voltage threshold, according to the difference voltage of each single battery, determine it is described to
It surveys battery pack and short trouble or contact resistance failure occurs；
Wherein, the difference voltage of any single battery is the monomer voltage and each monomer of any single battery
The difference of the monomer voltage average value of battery.
In conjunction with second aspect, in the first possible implementation, described device further includes：
Module is obtained, it is each in presetting N number of sampling instant for obtaining each single battery in the mesuring battary group
The monomer voltage of sampling instant；
The determining module is also used to be determined described in each sampling instant according to the monomer voltage that the acquisition module obtains
The difference voltage of each single battery, and determine that the mesuring battary group occurs according to the difference voltage of each single battery
The inconsistent failure of monomer voltage；
Wherein, the N is the integer greater than zero.
The first possible implementation in conjunction with second aspect, in the second possible implementation, described device is also
Including computing module；
The acquisition module is also used to obtain in the mesuring battary group each single battery any sampling instant k's
Monomer voltage；
The computing module, for calculating each single battery described in the sampling instant k that the acquisition module obtains
Monomer voltage average value Um；
The determining module, each single battery for being obtained according to the acquisition module is in the sampling instant
The U that the monomer voltage of k and the computing module are calculatedmDifference determine each single battery difference electricity
It presses, and the difference voltage of the single battery i of difference voltage maximum absolute value is determined as to the maximum absolute difference of the sampling instant k
Different voltage UDmax, i；
The determining module is also used to the U in a sampling instant record of continuous N 'Dmax, iGreater than default difference voltage threshold value
When, determine the U for being greater than default difference voltage threshold value at firstDmax, iMesuring battary group described in the sampling instant m of appearance has occurred
The inconsistent failure of monomer voltage；
Wherein, N ' is the integer less than or equal to N.
In conjunction with second of second aspect possible implementation, in the third possible implementation, the determining mould
Block, for determining that the sampling instant m of the inconsistent failure of monomer voltage occurs for the mesuring battary group；
The acquisition module is also used to obtain mesuring battary group described in the sampling instant m that the determining module determines
Total voltage Utotal1；
The acquisition module is also used to obtain each single battery that mesuring battary group described in the sampling instant m includes
Monomer voltage；
The computing module, the sum of monomer voltage for calculating each single battery U1, and calculate the Utotal1
With the U1Difference；
The determining module, it is poor that the absolute value of the difference for calculating the computing module is determined as described first
Value.
In conjunction with second of second aspect possible implementation, in the fourth possible implementation, the determining mould
Block, for determining that the sampling instant m of the inconsistent failure of monomer voltage occurs for the mesuring battary group；
The acquisition module is also used to obtain the sampling instant before the sampling instant m that the determining module determines
The total voltage U of the upper mesuring battary group of m1total2；
The acquisition module is also used to obtain each single battery that mesuring battary group described in the sampling instant m1 includes
Monomer voltage；
The computing module, for calculating the sum of the monomer voltage for each single battery that the acquisition module obtains
U2, and calculate the Utotal2With the U2Difference；
The determining module, it is poor that the absolute value of the difference for calculating the computing module is determined as described second
Value.
In conjunction with the 4th kind of possible implementation of the 4th kind of possible implementation of second aspect or second aspect,
In five kinds of possible implementations, the determining module is also used to：
Determine the voltage jump value that the inconsistent single battery of voltage occurs in the mesuring battary group, and according to the electricity
Pressure mutation value determines the predetermined voltage threshold；
Wherein, the voltage jump value is the sampling of the inconsistent single battery of the generation voltage before the failure occurs
The monomer voltage difference of sampling instant after moment and failure generation.
It is any into the 5th kind of possible implementation of second aspect in conjunction with second of second aspect possible implementation
Kind, in a sixth possible implementation, the determining module, for determining that monomer voltage occurs for the mesuring battary group not
The sampling instant m of consistent failure；
The computing module, when for calculating x1 sampling before the sampling instant m that the determining module determines
First average absolute difference value U of the maximum antipode voltage at quarterMAD1；
The computing module is also used to calculate the maximum antipode of x2 sampling instant after the sampling instant m
Second average absolute difference value U of voltageMAD2, wherein the x2=x1=x, the x are more than or equal to (N-1)/2；
The failure analysis module, the U for being calculated in the computing moduleMAD2More than or equal to the UMAD2
Presupposition multiple threshold value when, determine that contact resistance failure occurs in the mesuring battary group, otherwise determine that the mesuring battary group goes out
Existing short trouble；
Wherein, average absolute difference value UMADCalculation expression be：
Wherein, Udmax,i(t)For the maximum antipode voltage of sampling instant t.
The third aspect, the embodiment of the invention provides a kind of terminal devices, including：Memory and processor；
The memory is used to store a set of program code；
The processor is used to that the program code stored in the memory to be called to execute the side that above-mentioned first aspect provides
Method.
Fourth aspect, the embodiment of the present application provide a kind of computer storage medium, for being stored as above-mentioned terminal device
Computer software instructions used, it includes for executing program designed by the method that above-mentioned first aspect provides.
The application can be in the inconsistent failure of the generation monomer voltage of the single battery in mesuring battary group, according to mesuring battary
The total voltage of group and the monomer voltage of each single battery determine whether the reason of mesuring battary group breaks down is voltage measurement
Failure.It, can also be according to the difference electricity of each single battery if the reason of mesuring battary group breaks down is not voltage measurement failure
It presses and determines that the source of failure of mesuring battary group is short trouble or contact resistance failure.The application can realize mesuring battary group
The first diagnosis of the source of failure, can be improved the accuracy of the detection in battery failures source.Further, the application can determine electricity
After the inconsistent failure of monomer voltage of single battery occurs for pond group, multiple maximum antipodes before and after failure can be recorded respectively
Voltage, so can determine battery pack break down front and back maximum antipode voltage average absolute difference value.The application can
It is compared by the size of the average absolute difference value before and after battery failure and determines that battery failure is short trouble or contact
Resistance Fault improves battery failures detection to fast implement the diagnosis of the batteries monomer voltage inconsistency source of failure
Applicability, and then the safety of battery can be improved.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without creative efforts, it can also be obtained according to these attached drawings others
Attached drawing.
Fig. 1 is the structural schematic diagram of battery failures detection system provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of terminal device provided in an embodiment of the present invention；
Fig. 3 is a flow diagram of the method for battery failures detection provided in an embodiment of the present invention；
Fig. 4 is another flow diagram of the method for battery failures detection provided in an embodiment of the present invention；
Fig. 5 a is a schematic diagram of the inconsistent failure of battery cell voltage provided in an embodiment of the present invention；
Fig. 5 b is another schematic diagram of the inconsistent failure of battery cell voltage provided in an embodiment of the present invention；
Fig. 6 a is another schematic diagram of the inconsistent failure of battery cell voltage provided in an embodiment of the present invention；
Fig. 6 b is another schematic diagram of the inconsistent failure of battery cell voltage provided in an embodiment of the present invention；
Fig. 7 is the average absolute difference U of battery pack provided in an embodiment of the present inventionMADSchematic diagram；
Fig. 8 is the structural schematic diagram of the device of battery failures detection provided in an embodiment of the present invention.
Specific embodiment
The method of battery failures detection provided in an embodiment of the present invention can be applied to terminal device, and above-mentioned terminal device is specific
It is built-in in existing battery management system (battery management system, BMS), can also be for comprising existing
The equipment of BMS can specifically determine, herein with no restrictions according to practical application scene demand.The terminal device is also referred to as used
Family equipment (user equipment, UE), mobile station (mobile station, MS), mobile terminal (mobile terminal)
Deng.Above-mentioned terminal device can also be the mobile devices such as portable, pocket, hand-held, computer built-in type or vehicular.
For example, terminal device can be mobile phone (or being " honeycomb " phone) or computer or electronic vapour with mobile property
Vehicle etc..The embodiment of the present invention will be illustrated by taking electric car as an example.It should be understood that other than terminal device, the present invention
The method for the battery failures detection that embodiment provides also can be applied to other using in the device of secondary cell, not limit herein
System.The monomer voltage inconsistent battery cell (also referred to as single battery) described in the embodiment of the present invention that occurs can be series connection
Some single battery in battery pack can also be the single battery to work independently, specifically can be determining according to practical application scene,
This is with no restrictions.
Electric vehicle battery system is likely to occur the monomer voltage inconsistency failure of burst in the process of running, i.e., some
The voltage of the voltage of single battery and other monomers battery occurs apparent inconsistent.In electric vehicle battery system, cause
The reason of monomer voltage inconsistency failure mainly includes：Battery voltage measurement failure, contact resistance increase, battery short circuit etc..
When the source of failure difference of electric vehicle battery system, need to take different processing mode.For example, if electric car is electric
The inconsistent failure of generation monomer voltage of cell system is caused by voltage measurement failure, then the electric car in traveling can continue
Normally travel is to helpdesk.If the inconsistent failure of generation monomer voltage of electric vehicle battery system is drawn by contact resistance growth
Rise, then electric car can by way of limiting power " limp-home.If the generation monomer voltage of electric vehicle battery system
Inconsistent failure is battery short circuit, then should abandon vehicle.Therefore, when electric vehicle battery system breaks down, how to recognize electronic
The source of failure of automotive battery system, such as voltage measurement failure, contact resistance failure or short trouble are to improve electronic vapour
Vehicle safety one of major issue urgently to be resolved.
It is the structural schematic diagram of battery failures detection system provided in an embodiment of the present invention referring to Fig. 1.The embodiment of the present invention
The battery failures detection system of offer can be the battery failures detection system for including in above-mentioned terminal device, can also be to be built in now
Battery failures detection system in some BMS can specifically determine, herein with no restrictions according to practical application scene.The present invention is real
The battery failures detection system for applying example offer includes mesuring battary group, monitoring management unit and accident analysis unit etc..Wherein,
The associated monitoring administrative unit that above-mentioned monitoring management unit concretely includes in existing BMS or BMS, specifically can be according to reality
Border application scenarios are determining, herein with no restrictions.Above-mentioned monitoring management unit can be used in the battery pack course of work, record in real time
Mesuring battary group and it includes single battery operating state data, including engraving mesuring battary group when each voltage sample
Hold the list of each single battery in voltage (i.e. the output voltage of battery pack, the also referred to as total voltage of battery pack) and mesuring battary group
The battery parameters such as bulk voltage.Above-mentioned accident analysis unit determines to be measured for every battery parameter that monitoring management unit detects
Source of failure etc. of battery pack, such as voltage measurement failure, contact resistance failure or short trouble etc..Further, failure
The source of failure for the battery pack that analytical unit can will test feeds back to monitoring management unit, is deposited by monitoring management unit
Store up, record and/or feed back to user.
Have below in conjunction with Fig. 2 to Fig. 8 method and device detected to battery failures provided in an embodiment of the present invention
Body description.
It referring to fig. 2, is the structural schematic diagram of terminal device provided in an embodiment of the present invention.As shown in Fig. 2, the present invention is implemented
Example provide terminal device may include：Memory 100, processor 200 and display 300 etc..Wherein, memory 100 stores
Batch processing code, the program code for realizing mesuring battary group and it includes single battery operating state data inspection
The calculating of the battery parameters such as survey, the difference voltage of record and single battery, maximum antipode voltage, average absolute difference value
Deng operation.Processor 200 is used to read the program code in memory 100, then executes the method that program code defines.Example
Such as, the program code stored in the readable access to memory 100 of processor 200 executes the operation such as fault detection of battery.
Processor 200 may include one or more processors, for example, processor 200 may include in one or more
Central processor.When processor 200 includes multiple processors, this multiple processor be can integrate on same chip, can also
To be respectively independent chip.One processor may include one or more processing cores, and following embodiment is by taking multicore as an example
It introduces, but the method for battery failures provided in an embodiment of the present invention detection also can be applied to single core processor, specifically may be used
It is determined according to practical application scene demand, herein with no restrictions.
In addition, memory 100 is also stored with other data apart from program code, other data may include that processor is held
The data generated after row above procedure code, for example, mesuring battary group and it includes single battery operating state data
Deng.Memory 100 generally comprises memory and external memory.Memory can be random access memory (RAM), read-only memory (ROM), and
Cache (CACHE) etc..External memory can be hard disk, CD, USB disk, floppy disk or magnetic tape station etc..Program code is usually stored
On external memory, program code can be loaded into memory from external memory before executing processing by processor.
It is a flow diagram of the method for battery failures detection provided in an embodiment of the present invention referring to Fig. 3.The present invention is real
Apply in the method for the detection of battery failures described in example includes that the detection of the inconsistent failure of monomer voltage, battery pack occur for battery pack
The inspection that the detection of voltage measurement failure, the detection of battery pack generation short trouble and battery pack are in contact Resistance Fault occurs
The implementation of the operations such as survey.
Method provided in an embodiment of the present invention includes step：
S1 determines that the inconsistent failure of monomer voltage occurs for mesuring battary group.
It in some possible embodiments, first can be according to the monomer voltage of single battery each in mesuring battary group
Difference determines the inconsistent failure of the monomer voltage for the single battery whether mesuring battary group occurs.In the specific implementation, can obtain first
Take the monomer voltage of each single battery each sampling instant in preset N number of sampling instant in mesuring battary group, Jin Erke
Determine the difference voltage of each single battery of each sampling instant.It further, can be according to the difference voltage of each single battery
Determine that the inconsistent failure of monomer voltage occurs for mesuring battary group.In the specific implementation, being provided in an embodiment of the present invention referring to fig. 4
The identification mode of the inconsistent failure of monomer voltage occurs for another flow diagram of the method for battery failures detection, mesuring battary group
It may include step S11-S14：
S11. the average value U of the monomer voltage of each single battery on sampling instant k is calculatedm。
Assuming that battery pack shares n single battery, sampling instant k is any of preset N number of sampling instant, that is, is counted
Following implementations can be used in the average voltage for calculating any sampling instant.In the specific implementation, described in the embodiment of the present invention
Sampling instant can adopt for BMS according to each data of the battery parameter datas such as the total voltage of setting sampling interval acquisition battery pack
Collect time point, above-mentioned N number of sampling instant can be continuous N number of acquisition of the battery parameter datas such as the BMS total voltage for acquiring battery pack
Time point.The monomer voltage of each single battery can be obtained by BMS system acquisition in mesuring battary group, not need additionally to increase biography
Sensor, and the data volume of required storage and the calculation amount of data are smaller, reduce the difficulty of battery failures detection.It is above-mentioned each
The monomer voltage of single battery can also be detected by other voltage detectors, herein with no restrictions.
Terminal device can obtain each single battery in the monomer voltage of sampling instant k from the data that BMS is recorded first,
And then average voltage U can be calculatedm(k)：
Wherein, Ui(k) i-th of single battery is represented in the voltage of kth time acquisition, i.e. i-th of single battery is in sampling
Carve the monomer voltage of k.Um(k) average voltage in kth time acquisition, i.e. each monomer in sampling instant k mesuring battary group are represented
The average value of the monomer voltage of battery.
S12. the difference voltage U of each single battery is calculatedd,i(k)：
Ud,i(k)=Ui(k)-Um(k)
Wherein, Ud,i(k) difference voltage of i-th of single battery in kth time acquisition is represented, i.e. i-th of single battery exists
The difference voltage of sampling instant k.
S13. the difference voltage U of difference voltage maximum absolute value under same sampling instant is recordeddmax,i。
Assuming that in mesuring battary group the difference voltage of i-th of single battery absolute value | Ud,i(k) | it is greater than the sampling instant
The absolute value of the difference voltage of any other monomers battery in k battery pack, then can be by Ud,i(k) it is recorded as Udmax,i.Wherein, above-mentioned
The U of recorddmaxHereinafter referred to as maximum antipode voltage.
In some possible embodiments, terminal device can record N number of according to the implementation of above-mentioned steps S11-S13
The U of each sampling instant in sampling instantdmax,i, to obtain N number of Udmax,i.Wherein, above-mentioned N can be 2x+1, wherein x is desirable
10 equal natural numbers.Wherein, the value of x can be determined according to the misdetection rate of mesuring battary group fault detection or the choice of False Rate.
Wherein, the value of x is larger can be improved False Rate, and the value of x is smaller, and misdetection rate can be improved, and the embodiment of the present invention will be for 10
It is illustrated.In the specific implementation, the data of the every record one acquisition of terminal device, then can update the data recorded once,
Only record the data of nearest 2x+1 acquisition.
S14. determine that the inconsistent failure of monomer voltage occurs for mesuring battary group according to the difference voltage of each single battery.
In some possible embodiments, the maximum antipode voltage under each sampling instant of terminal device records
Later, then the inconsistent event of monomer voltage whether can have occurred according to the data identification mesuring battary group that each sampling instant records
Barrier.(it is assumed to be the U of a sampling instant of the continuous N ' of single battery i) when there is the same single batteryDmax, iGreater than default difference electricity
Threshold value is pressed, then can determine the U for being greater than default difference voltage threshold value at firstDmax, iThe sampling instant m of appearance single battery i
It is inconsistent that there have been monomer voltages, i.e., the inconsistent failure of monomer voltage has occurred in mesuring battary group.For example, working as single battery i
Continuous 3 Udmax,iWhen greater than default difference voltage threshold value, then it is believed that first U is occurring in battery cell idmax,iWhen just send out
The inconsistent failure of voltage is given birth to.Wherein, above-mentioned default difference voltage threshold value can be a times or more of preceding x UdmaxAverage value.Its
In, above-mentioned a can be determined according to the misdetection rate of mesuring battary group fault detection or the choice of False Rate, such as 5 etc..It specifically can root
Determine that the value of a, the embodiment of the present invention will be illustrated for 5 according to practical application scene.
In the specific implementation, can be performed if terminal device has determined that the inconsistent failure of monomer voltage occurs for mesuring battary group
Step S2.Further determine that the source of failure of the inconsistent failure of monomer voltage occurs for battery pack, for example, voltage measurement failure,
Short trouble or contact resistance failure etc..If it is inconsistent not recognize monomer voltage, step S11 can be continued to execute
Continue the monomer voltage state of the single battery of monitoring battery pack.
It is a signal of the inconsistent failure of battery cell voltage provided in an embodiment of the present invention below in conjunction with Fig. 5 a and 5b
Figure.
A monomer voltage is acquired for 1s shown in Fig. 5 a and Fig. 5 b, i.e. the sampling time interval of monomer voltage is 1s, example
If the collection period of BMS acquisition battery data is 1s.Fig. 5 a show the battery pack being made of 12 single batteries (assuming that
For A battery pack), there is a single battery the inconsistent phenomenon of voltage occur in battery pack A.It is can be found that from Fig. 5 a
The single battery that broken line voltage curve represents in 3600s, A battery pack starts the monomer for having occurred with other most of single batteries
The inconsistent failure problems of voltage.Fig. 5 b show another battery pack being made of 12 battery cells (being set as B battery group).
There is a monomer the inconsistent phenomenon of voltage occur in B battery group.The dotted line from figure it can be found that in 3600s, B battery group
The single battery that voltage curve represents starts the failure problems for having occurred inconsistent with the voltage of other most of single batteries.
It is another schematic diagram of the inconsistent failure of battery cell voltage provided in an embodiment of the present invention such as Fig. 6 a and 6b.
Fig. 6 a and 6b are that monomer voltage difference voltage is arrived in 3500s in two battery packs (including A battery pack and B battery group)
Change curve when 3800s, it can be found that there have a single battery to occur in A battery pack and B battery group after 3600s to be bright
The phenomenon of aobvious battery difference voltage exception.To maximum difference absolute value of voltage U under same sampling instantdmax,iIt is recorded.Note
Recording quantity is 2x+1, and x of the embodiment of the present invention takes 10, and every record is primary to be updated once, i.e., only records nearest 21 data.When
Continuous 3 Udmax,iPreceding 10 record values (i.e. maximum difference absolute value of voltage U greater than 5 times or moredmax,i) average value when, recognize
There is first U for the single batterydmax,iWhen the inconsistent failure of voltage just has occurred.Also dotted line in Fig. 6 a is just had identified
All the inconsistent failure of voltage just has occurred in 3600s in the single battery that dotted line represents in the single battery and Fig. 6 b of representative.
S2, when determining that the inconsistent failure of monomer voltage occurs for mesuring battary group, the total voltage of the mesuring battary group and institute
State first difference of the sum of monomer voltage of each single battery that mesuring battary group includes.
S3, before determining that the inconsistent failure of monomer voltage occurs for the mesuring battary group, total electricity of the mesuring battary group
Second difference of pressure and the sum of the monomer voltage of each single battery.
In some possible embodiments, terminal device has determined that the inconsistent failure of monomer voltage occurs for mesuring battary group
Later, whether the source that can first determine whether the inconsistent failure of monomer voltage is voltage measurement failure.In the specific implementation, terminal can root
The voltage change conditions before and after the inconsistent failure of monomer voltage occur according to battery pack, determine the amplitude of voltage change whether default
In variation range, to determine whether for voltage measurement failure.Specifically, terminal device can be walked according to above-mentioned steps S11-S14 etc.
Rapid described implementation, determines that the sampling instant m of the inconsistent failure of monomer voltage occurs for mesuring battary group.Terminal device can
From the total voltage U for obtaining mesuring battary on sampling instant m in the data that BMS is recordedtotal1.For example, battery-end electricity shown in FIG. 1
Pressure etc..Terminal device can also be from the list for obtaining each single battery in mesuring battary group on sampling instant m in the data that BMS is recorded
Bulk voltage, and then the sum of monomer voltage of single battery U can be calculated1.Further, U can be calculatedtotal1And U1Difference, by this
The absolute value of difference is determined as the first difference, is set as | dUtotal|p, for determining the source of failure of battery pack.Following expression institute
Show：
Wherein, UtotalIt is the total voltage of mesuring battary group, which can be collected by BMS, can also be by other voltages
Measuring device real-time measurement obtains, herein with no restrictions.UiIt is the monomer voltage of single battery i, which can be surveyed by BMS
It measures, can also be obtained by other voltage measuring apparatus real-time measurements.
In some possible embodiments, it is single can also to calculate mesuring battary group generation according to above-mentioned expression formula for terminal device
Before the inconsistent failure of bulk voltage, the difference of the sum of monomer voltage of the total voltage of mesuring battary group and each single battery |
dUtotal|a.In the specific implementation, terminal device can obtain the total voltage of the sampling instant m1 mesuring battary group before sampling instant m
Utotal2.Wherein, above-mentioned sampling instant m1 can be the previous sampling instant of sampling instant m, and the position of sampling instant m1 can also root
It is determined according to practical application scene demand.That is, the acquisition time interval between sampling instant m1 and sampling instant m can be the one of BMS
A sampling period can also be multiple sampling intervals of BMS, herein with no restrictions.The embodiment of the present invention will be with a sampling period
For be illustrated, such as 1s.
Terminal device can also obtain each monomer electricity that sampling instant m1 mesuring battary group includes from the data that BMS is recorded
The monomer voltage in pond, and the sum of monomer voltage for calculating each single battery U2.Further, above-mentioned U can be calculatedtotal2With U2's
Difference, and the absolute value for changing difference is determined as the second difference, it is set as | dUtotal|a, for determining the source of failure of battery pack.
S4 judges that the difference of the first difference and the second difference is greater than predetermined voltage threshold, if so, determining mesuring battary group
There is voltage measurement failure, it is no to then follow the steps S5.
In some possible embodiments, if it is above-mentioned | dUtotal|pWith | dUtotal|aDifference be greater than predeterminated voltage threshold
Value, then can determine that voltage measurement failure occurs in mesuring battary group.Wherein, above-mentioned predetermined voltage threshold can be sent out by mesuring battary group
When the inconsistent failure of raw monomer voltage, the voltage jump value for the single battery of voltage jump occur is determined.For example, above-mentioned default electricity
Pressure threshold value can be occur the single battery of voltage jump voltage jump value 30%.Wherein, above-mentioned voltage jump value refers to hair
Monomer voltage difference of the inconsistent single battery of raw monomer voltage before breaking down and after breaking down.For example, this
Described voltage jump value is that the generation inconsistent monomer of voltage is absolute in the voltage of 3599s and 3600s after inventive embodiments
Difference.If above-mentioned | dUtotal|pWith | dUtotal|aDifference be more than single battery voltage jump value 30%, then can determine
The inconsistent failure of the monomer voltage of mesuring battary group is caused by voltage measurement failure.Wherein, the 30% of above-mentioned voltage jump value is only
It is an example of the embodiment of the present invention, the size setting of predetermined voltage threshold can be determined according to the demand of practical application scene,
Herein with no restrictions.
In the specific implementation, if the source that the inconsistent failure of monomer voltage occurs for mesuring battary group is not voltage measurement failure,
It can then further determine that the source of failure is short trouble or contact resistance failure.
S5, according to the difference voltage of each single battery, determine the mesuring battary group occur short trouble or
Contact resistance failure.
In some possible embodiments, when terminal device determines that mesuring battary group occurs the inconsistent failure of voltage and occurs
And after non-voltage measurement failure causes, then it needs to be determined that being contact voltage failure or short trouble.In the specific implementation, terminal is set
The standby maximum antipode voltage U that can be calculated separately before and after failuredmax,iAverage absolute difference value, according to flat before and after failure
The ratio size of absolute difference value judges contact resistance failure or short trouble, to fast implement electric in electric vehicle
Press the diagnosis of the inconsistency source of failure.In the specific implementation, terminal device can determine that mesuring battary group generation monomer voltage is different
The sampling instant m of failure is caused, calculate the maximum antipode voltage of x1 sampling instant before sampling instant m first is average
Absolute difference value UMAD1.Further, terminal device can also calculate the maximum of x2 sampling instant after sampling instant m absolutely
Second average absolute difference value U of difference voltageMAD2, wherein above-mentioned x2=x1=x, x can be 10.If above-mentioned UMAD2Be greater than or
Equal to above-mentioned UMAD2Presupposition multiple threshold value (being set as l times), it is determined that there is contact resistance failure in mesuring battary group, otherwise determines
There is short trouble in mesuring battary group.
Step S51~S52 as shown in Figure 4：
S51. the average absolute difference value U that x record value before and after the inconsistent failure of voltage occurs is calculatedMAD, pAnd UMAD, a。
Mesuring battary group occurs respectively the x record value progress average absolute difference value before and after the inconsistent failure of voltage
It calculates, thus obtains that the average absolute difference value U after the inconsistent failure of voltage occursMAD, pBefore the inconsistent failure of voltage occurs
Average absolute difference value UMAD, a.For example, respectively to occur the inconsistent failure of monomer voltage before and failure after 10 sampling instants (such as
3590~3599s and 3601~3610s) record value carry out average absolute difference value calculating.
Average absolute difference value UMADCalculation expression is：
Wherein, Udmax,i(t)For the maximum antipode voltage of sampling instant t, UMADAverage absolute difference value is represented, referred to as
MAD value.
S52. work as UMAD, p>l·UMAD, aWhen, dynamic becomes strong after showing the inconsistent failure of voltage, and then can be identified as contacting
Resistance Fault, on the contrary it is short trouble.Wherein, above-mentioned l is that engineering is practical determining, can generally take 5, herein with no restrictions.
It is the average absolute difference U of battery pack provided in an embodiment of the present invention referring to Fig. 7MADSchematic diagram.It is shown in Fig. 7
MAD value of two battery packs of experiment before and after the inconsistent failure of monomer voltage.Wherein, A2 single battery represents in A battery pack
No. 2 single batteries, i.e., the single battery that above-mentioned Fig. 5 a and Fig. 6 a dotted line represent.B3 single battery represents No. 3 of B battery group
The single battery that single battery, i.e., above-mentioned Fig. 5 b and Fig. 6 b dotted line represent.Wherein, the inconsistent event of voltage occurs for A2 single battery
The MAD value of the maximum antipode voltage of A battery pack calculated is greater than 5 times or more of MAD value calculated before failure after barrier,
Gap is larger, and the voltage dynamic after showing the generation inconsistent failure of voltage becomes strong, and then can determine the event of A2 single battery
Hindering source is contact resistance failure.MAD value difference before and after the B3 single battery generation inconsistent failure of voltage is away from smaller, Jin Erke
The source of failure for determining B3 single battery is short trouble.
Voltage inconsistency in electric vehicle can be fast implemented in existing product according to method provided in an embodiment of the present invention
The diagnosis of source failure can also occur to provide mentioning for three kinds of sources of failure when voltage inconsistency in electric vehicle driving conditions
Show, and suggests that user using corresponding measure, guarantees electric vehicle traffic safety.Implementation provided by the embodiment of the present invention
In, pre-buried data volume is few, and implantation is simple, and low to hardware resource requirements, applicability is high.
The embodiment of the present invention can when the inconsistent failure of monomer voltage occurs for the single battery in mesuring battary group, according to
The monomer voltage of the total voltage and each single battery of surveying battery pack determines whether the reason of mesuring battary group breaks down is electricity
Pressure measurement failure.It, can also be according to each single battery if the reason of mesuring battary group breaks down is not voltage measurement failure
Difference voltage determines that the source of failure of mesuring battary group is short trouble or contact resistance failure.The application can realize electricity to be measured
The first diagnosis of the source of failure of pond group, can be improved the accuracy of the detection in battery failures source.Further, the application can be
After determining the inconsistent failure of monomer voltage that single battery occurs for battery pack, can record respectively before and after failure it is multiple it is maximum absolutely
To difference voltage, so can determine battery pack break down front and back maximum antipode voltage average absolute difference value.This
Application can by the size of the average absolute difference value before and after battery failure compare determine battery failure be short trouble or
Person's contact resistance failure improves battery failures to fast implement the diagnosis of the batteries monomer voltage inconsistency source of failure
The applicability of detection, and then the safety of battery can be improved.
It is the structural schematic diagram of the device of battery failures detection provided in an embodiment of the present invention referring to Fig. 8.The present invention is implemented
Example provide detection device include：
Determining module 81, for determining the mesuring battary in the inconsistent failure of mesuring battary group generation monomer voltage
First difference of the sum of the monomer voltage of each single battery that the total voltage and the mesuring battary group of group include.
The determining module 81 is also used to before the inconsistent failure of monomer voltage occurs for the mesuring battary group, is determined
Second difference of the sum of the monomer voltage of the total voltage of the mesuring battary group and each single battery.
Failure analysis module 82, for determining the difference of first difference and second difference in the determining module 81
When value is greater than predetermined voltage threshold, determine that voltage measurement failure occurs in the mesuring battary group.
The failure analysis module 82 is also used to determine first difference and described second poor in the determining module 81
When the difference of value is less than or equal to the predetermined voltage threshold, according to the difference voltage of each single battery, institute is determined
It states mesuring battary group and short trouble or contact resistance failure occurs；
Wherein, the difference voltage of any single battery is the monomer voltage and each monomer of any single battery
The difference of the monomer voltage average value of battery.
In some possible embodiments, described device further includes：
Module 83 is obtained, it is each in presetting N number of sampling instant for obtaining each single battery in the mesuring battary group
The monomer voltage of a sampling instant.
The determining module 81 is also used to determine each sampling instant according to the monomer voltage that the acquisition module 83 obtains
The difference voltage of each single battery, and the mesuring battary group is determined according to the difference voltage of each single battery
The inconsistent failure of monomer voltage occurs；
Wherein, the N is the integer greater than zero.
In some possible embodiments, described device further includes computing module 84；
The acquisition module 83 is also used to obtain in the mesuring battary group each single battery in any sampling instant k
Monomer voltage.
The computing module 84, for calculating each monomer described in the sampling instant k that the acquisition module 83 obtains
The average value U of the monomer voltage of batterym。
The determining module 81, each single battery for being obtained according to the acquisition module 83 is in the sampling
The U that the monomer voltage of moment k and the computing module are calculatedmDifference determine the difference of each single battery
Different voltage, and the difference voltage of the single battery i of difference voltage maximum absolute value is determined as the maximum of the sampling instant k absolutely
To difference voltage UDmax, i。
The determining module 81 is also used to the U in a sampling instant record of continuous N 'Dmax, iGreater than default difference voltage threshold
When value, the U for being greater than default difference voltage threshold value at first is determinedDmax, iMesuring battary group described in the sampling instant m of appearance occurs
Monomer voltage inconsistent failure；
Wherein, N ' is the integer less than or equal to N.
In some possible embodiments, the determining module 81, for determining that monomer occurs for the mesuring battary group
The sampling instant m of the inconsistent failure of voltage.
The acquisition module 83 is also used to obtain electricity to be measured described in the sampling instant m that the determining module 81 determines
The total voltage U of pond grouptotal1。
The acquisition module 83 is also used to obtain each monomer electricity that mesuring battary group described in the sampling instant m includes
The monomer voltage in pond.
The computing module 84, the sum of monomer voltage for calculating each single battery U1, and described in calculating
Utotal1With the U1Difference.
The absolute value of the determining module 81, the difference for calculating the computing module is determined as described first
Difference.
In some possible embodiments, the determining module 81, for determining that monomer occurs for the mesuring battary group
The sampling instant m of the inconsistent failure of voltage.
The acquisition module 83 is also used to obtain the sampling before the sampling instant m that the determining module 81 determines
The total voltage U of mesuring battary group described in moment m1total2。
The acquisition module 83 is also used to obtain each monomer electricity that mesuring battary group described in the sampling instant m1 includes
The monomer voltage in pond.
The computing module 84, for calculate it is described acquisition module obtain each single battery monomer voltage it
And U2, and calculate the Utotal2With the U2Difference.
The determining module 81, the absolute value of the difference for calculating the computing module 84 are determined as described
Two differences.
In some possible embodiments, the determining module 81 is also used to：
Determine the voltage jump value that the inconsistent single battery of voltage occurs in the mesuring battary group, and according to the electricity
Pressure mutation value determines the predetermined voltage threshold；
Wherein, the voltage jump value is the sampling of the inconsistent single battery of the generation voltage before the failure occurs
The monomer voltage difference of sampling instant after moment and failure generation.
In some possible embodiments, the determining module 81, for determining that monomer occurs for the mesuring battary group
The sampling instant m of the inconsistent failure of voltage.
The computing module 84 is sampled for x1 before calculating the sampling instant m that the determining module determines
First average absolute difference value U of the maximum antipode voltage at momentMAD1。
The computing module 84 is also used to calculate the maximum absolute difference of x2 sampling instant after the sampling instant m
Second average absolute difference value U of different voltageMAD2, wherein the x2=x1=x, the x are more than or equal to (N-1)/2.
The failure analysis module 82, the U for being calculated in the computing moduleMAD2More than or equal to described
UMAD2Presupposition multiple threshold value when, determine that contact resistance failure occurs in the mesuring battary group, otherwise determine the mesuring battary
There is short trouble in group；
Wherein, average absolute difference value UMADCalculation expression be：
Wherein, Udmax,i(t)For the maximum antipode voltage of sampling instant t.
In the specific implementation, the device of above-mentioned battery failures detection concretely terminal device provided in an embodiment of the present invention,
Implementation described in each step in the method for above-mentioned battery failures detection can be executed by the modules built in it.Tool
Body realizes that process can be found in implementation described in above-mentioned each step, and details are not described herein.It is retouched in the embodiment of the present invention
The failure analysis module the stated concretely accident analysis unit in Fig. 1, determining module, to obtain module and computing module can be figure
The functional module that monitoring management unit in 1 includes can also be the functional module that accident analysis unit includes, specifically can be according to each
Mode of operation performed by a module is determining, herein with no restrictions.
The embodiment of the present invention can when the inconsistent failure of monomer voltage occurs for the single battery in mesuring battary group, according to
The monomer voltage of the total voltage and each single battery of surveying battery pack determines whether the reason of mesuring battary group breaks down is electricity
Pressure measurement failure.It, can also be according to each single battery if the reason of mesuring battary group breaks down is not voltage measurement failure
Difference voltage determines that the source of failure of mesuring battary group is short trouble or contact resistance failure.The application can realize electricity to be measured
The first diagnosis of the source of failure of pond group, can be improved the accuracy of the detection in battery failures source.Further, the application can be
After determining the inconsistent failure of monomer voltage that single battery occurs for battery pack, can record respectively before and after failure it is multiple it is maximum absolutely
To difference voltage, so can determine battery pack break down front and back maximum antipode voltage average absolute difference value.This
Application can by the size of the average absolute difference value before and after battery failure compare determine battery failure be short trouble or
Person's contact resistance failure improves battery failures to fast implement the diagnosis of the batteries monomer voltage inconsistency source of failure
The applicability of detection, and then the safety of battery can be improved.
Specification of the invention, claims and the term " first " in attached drawing, " second ", " third " and " the 4th "
Etc. being not use to describe a particular order for distinguishing different objects.In addition, term " includes " and " having " and they appoint
What is deformed, it is intended that is covered and non-exclusive is included.Such as contain the process, method of series of steps or unit, system,
Product or equipment are not limited to listed step or unit, but optionally further comprising the step of not listing or list
Member, or optionally further comprising other step or units intrinsic for these process, method, system, product or equipment.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Claims (14)
1. a kind of method of battery failures detection, which is characterized in that including：
When the inconsistent failure of monomer voltage occurs for mesuring battary group, determine the mesuring battary group total voltage and the electricity to be measured
First difference of the sum of the monomer voltage of each single battery that pond group includes；
Before the inconsistent failure of monomer voltage occurs for the mesuring battary group, determine the total voltage of the mesuring battary group with it is described
Second difference of the sum of the monomer voltage of each single battery；
If the difference of first difference and second difference is greater than predetermined voltage threshold, it is determined that the mesuring battary group goes out
Existing voltage measurement failure；
If the difference of first difference and second difference is less than or equal to the predetermined voltage threshold, according to
The difference voltage of each single battery determines that short trouble or contact resistance failure occurs in the mesuring battary group；
Wherein, the difference voltage of any single battery is the monomer voltage and each single battery of any single battery
Monomer voltage average value difference.
2. the method as described in claim 1, which is characterized in that the method also includes：
Obtain the monomer electricity of each single battery each sampling instant in presetting N number of sampling instant in the mesuring battary group
Pressure；
Determine the difference voltage of each single battery described in each sampling instant, and according to the difference of each single battery electricity
Pressure determines that the inconsistent failure of monomer voltage occurs for the mesuring battary group；
Wherein, the N is the integer greater than zero.
3. method according to claim 2, which is characterized in that each single battery described in each sampling instant of determination
Difference voltage, and determine that the mesuring battary group generation monomer voltage is inconsistent according to the difference voltage of each single battery
Failure includes：
Each single battery in the mesuring battary group is obtained in the monomer voltage of any sampling instant k, and calculates the sampling
The average value U of the monomer voltage of each single battery described in moment km；
According to each single battery the sampling instant k monomer voltage and the UmDifference determine it is described each
The difference voltage of single battery, and the difference voltage of the single battery i of difference voltage maximum absolute value is determined as the sampling
The maximum antipode voltage U of moment kDmax, i；
If the U of continuous a sampling instant record of N 'Dmax, iGreater than default difference voltage threshold value, it is determined that be greater than at first default
The U of difference voltage threshold valueDmax, iThe inconsistent failure of monomer voltage has occurred in mesuring battary group described in the sampling instant m of appearance；
Wherein, N ' is the integer less than or equal to N.
4. method as claimed in claim 3, which is characterized in that the inconsistent failure of monomer voltage occurs for the mesuring battary group
When, determine the sum of the monomer voltage for each single battery that the total voltage of the mesuring battary group and the mesuring battary group include
The first difference include：
It determines that the sampling instant m of the inconsistent failure of monomer voltage occurs for the mesuring battary group, and obtains the sampling instant m institute
State the total voltage U of mesuring battary grouptotal1；
The monomer voltage for each single battery that mesuring battary group described in the sampling instant m includes is obtained, and is calculated described each
The sum of the monomer voltage of a single battery U1；
Calculate the Utotal1With the U1Difference, and the absolute value of the difference is determined as first difference.
5. method as claimed in claim 3, which is characterized in that the mesuring battary group occur the inconsistent failure of monomer voltage it
Before, the second difference of the total voltage and the sum of the monomer voltage of each single battery that determine the mesuring battary group includes：
Determine that the sampling instant m of the inconsistent failure of monomer voltage occurs for the mesuring battary group, and obtain the sampling instant m it
The total voltage U of mesuring battary group described in preceding sampling instant m1total2；
The monomer voltage for each single battery that mesuring battary group described in the sampling instant m1 includes is obtained, and is calculated described each
The sum of the monomer voltage of a single battery U2；
Calculate the Utotal2With the U2Difference, and the absolute value of the difference is determined as second difference.
6. method as described in claim 4 or 5, which is characterized in that monomer electricity has occurred in the determination mesuring battary group
After pressing inconsistent failure, the method also includes：
Determine the voltage jump value that the inconsistent single battery of voltage occurs in the mesuring battary group, and prominent according to the voltage
Variate determines the predetermined voltage threshold；
Wherein, the voltage jump value is the sampling instant of the inconsistent single battery of the generation voltage before the failure occurs
The monomer voltage difference of sampling instant after occurring with failure.
7. such as the described in any item methods of claim 3-6, which is characterized in that the difference according to each single battery
Voltage determines that short trouble occurs in the mesuring battary group or contact resistance failure includes：
Determine that the sampling instant m of the inconsistent failure of monomer voltage occurs for the mesuring battary group, before calculating the sampling instant m
X1 sampling instant maximum antipode voltage the first average absolute difference value UMAD1；
Calculate the second average absolute difference value of the maximum antipode voltage of x2 sampling instant after the sampling instant m
UMAD2, wherein the x2=x1=x, the x are more than or equal to (N-1)/2；
If the UMAD2More than or equal to the UMAD2Presupposition multiple threshold value, it is determined that the mesuring battary group contacts
Otherwise Resistance Fault determines that short trouble occurs in the mesuring battary group；
Wherein, average absolute difference value UMADCalculation expression be：
Wherein, Udmax,i(t)For the maximum antipode voltage of sampling instant t.
8. a kind of device of battery failures detection, which is characterized in that including：
Determining module, for determining the total of the mesuring battary group in the inconsistent failure of mesuring battary group generation monomer voltage
First difference of the sum of the monomer voltage of each single battery that voltage and the mesuring battary group include；
The determining module is also used to before the inconsistent failure of monomer voltage occurs for the mesuring battary group, determine it is described to
Survey the second difference of the sum of the total voltage of battery pack and the monomer voltage of each single battery；
Failure analysis module, for determining that the difference of first difference and second difference is greater than in advance in the determining module
If when voltage threshold, determining that voltage measurement failure occurs in the mesuring battary group；
The failure analysis module is also used to determine the difference of first difference and second difference in the determining module
When less than or equal to the predetermined voltage threshold, according to the difference voltage of each single battery, the electricity to be measured is determined
There is short trouble or contact resistance failure in pond group；
Wherein, the difference voltage of any single battery is the monomer voltage and each single battery of any single battery
Monomer voltage average value difference.
9. device as claimed in claim 8, which is characterized in that described device further includes：
Module is obtained, for obtaining each single battery each sampling in presetting N number of sampling instant in the mesuring battary group
The monomer voltage at moment；
The determining module is also used to be determined according to the monomer voltage that the acquisition module obtains each described in each sampling instant
The difference voltage of single battery, and determine that monomer occurs for the mesuring battary group according to the difference voltage of each single battery
The inconsistent failure of voltage；
Wherein, the N is the integer greater than zero.
10. device as claimed in claim 9, which is characterized in that described device further includes computing module；
The acquisition module is also used to obtain in the mesuring battary group each single battery in the monomer of any sampling instant k
Voltage；
The computing module, for calculating the list of each single battery described in the sampling instant k that the acquisition module obtains
The average value U of bulk voltagem；
The determining module, each single battery for being obtained according to the acquisition module is the sampling instant k's
The U that monomer voltage and the computing module are calculatedmDifference determine the difference voltage of each single battery,
And the difference voltage of the single battery i of difference voltage maximum absolute value is determined as to the maximum antipode of the sampling instant k
Voltage UDmax, i；
The determining module is also used to the U in a sampling instant record of continuous N 'Dmax, iWhen greater than default difference voltage threshold value, really
It is scheduled on first U for being greater than default difference voltage threshold valueDmax, iMonomer has occurred in mesuring battary group described in the sampling instant m of appearance
The inconsistent failure of voltage；
Wherein, N ' is the integer less than or equal to N.
11. device as claimed in claim 10, which is characterized in that
The determining module, for determining that the sampling instant m of the inconsistent failure of monomer voltage occurs for the mesuring battary group；
The acquisition module is also used to obtain the total of mesuring battary group described in the sampling instant m that the determining module determines
Voltage Utotal1；
The acquisition module is also used to obtain the list for each single battery that mesuring battary group described in the sampling instant m includes
Bulk voltage；
The computing module, the sum of monomer voltage for calculating each single battery U1, and calculate the Utotal1With institute
State U1Difference；
The determining module, the absolute value of the difference for calculating the computing module are determined as first difference.
12. device as claimed in claim 10, which is characterized in that
The determining module, for determining that the sampling instant m of the inconsistent failure of monomer voltage occurs for the mesuring battary group；
The acquisition module is also used to obtain the sampling instant m1 institute before the sampling instant m that the determining module determines
State the total voltage U of mesuring battary grouptotal2；
The acquisition module is also used to obtain the list for each single battery that mesuring battary group described in the sampling instant m1 includes
Bulk voltage；
The computing module, the sum of monomer voltage of each single battery for calculating acquisition module acquisition U2, and
Calculate the Utotal2With the U2Difference；
The determining module, the absolute value of the difference for calculating the computing module are determined as second difference.
13. the device as described in claim 11 or 12, which is characterized in that the determining module is also used to：
Determine the voltage jump value that the inconsistent single battery of voltage occurs in the mesuring battary group, and prominent according to the voltage
Variate determines the predetermined voltage threshold；
Wherein, the voltage jump value is the sampling instant of the inconsistent single battery of the generation voltage before the failure occurs
The monomer voltage difference of sampling instant after occurring with failure.
14. such as the described in any item devices of claim 10-13, which is characterized in that
The determining module, for determining that the sampling instant m of the inconsistent failure of monomer voltage occurs for the mesuring battary group；
The computing module, for calculating x1 sampling instant before the sampling instant m that the determining module determines
First average absolute difference value U of maximum antipode voltageMAD1；
The computing module is also used to calculate the maximum antipode voltage of x2 sampling instant after the sampling instant m
The second average absolute difference value UMAD2, wherein the x2=x1=x, the x are more than or equal to (N-1)/2；
The failure analysis module, the U for being calculated in the computing moduleMAD2More than or equal to the UMAD2It is pre-
If when multiple threshold value, determining that contact resistance failure occurs in the mesuring battary group, it is short otherwise to determine that the mesuring battary group occurs
Road failure；
Wherein, average absolute difference value UMADCalculation expression be：
Wherein, Udmax,i(t)For the maximum antipode voltage of sampling instant t.
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