CN106199440A - A kind of battery management system and the voltage sampling circuit of use, method - Google Patents
A kind of battery management system and the voltage sampling circuit of use, method Download PDFInfo
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- CN106199440A CN106199440A CN201610513608.3A CN201610513608A CN106199440A CN 106199440 A CN106199440 A CN 106199440A CN 201610513608 A CN201610513608 A CN 201610513608A CN 106199440 A CN106199440 A CN 106199440A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of battery management system and the voltage sampling circuit of use, method.The set of cells of battery management system management includes N number of battery being connected in series；The voltage sample module of battery management system includes sampling switch group and an AD changer；Described sampling switch group includes N+1 sampling switch, and the first end of top n sampling switch is sequentially connected with the positive pole of N number of battery being connected in series, and the first end of N+1 sampling switch connects the negative pole of n-th battery；Second end of N+1 sampling switch alternately connects the positive input terminal of an AD changer, negative input end successively；Voltage sample module also includes Redundanter schalter group；Redundanter schalter group includes the first Redundanter schalter and the second Redundanter schalter, and the first Redundanter schalter is connected in parallel on the two ends of the first sampling switch, and the second Redundanter schalter is connected in parallel on the two ends of N+1 sampling switch；Processing module is used for judging whether abnormal conditions of sampling.The present invention can low cost and detect voltage sample abnormal conditions quickly and easily.
Description
[technical field]
The present invention relates to battery management system and the voltage sampling circuit of use, method.
[background technology]
The novel batteries such as lithium ion battery are when being used in series, in order to ensure the safe handling of battery, it is generally required to configuration
Battery management system (BMS).The effect of BMS is mainly used to detect in real time the electricity of each battery cell in the set of cells of its management
Pressure, if each monomer voltage of series battery is inconsistent, in addition it is also necessary to equalize.As it is shown in figure 1, be battery management system
Structural representation.Battery management system includes cascading the bidirectional DC-DC converter of connection, polarity reverser, battery choosing successively
Logical module 100, voltage sample module 200 and processing module.Battery management system shown in figure is managed for 4 string set of cells
Reason.Voltage sample module 200 includes 5 sampling switch and an AD changer.The equalization function of battery management system refers to BMS institute
A kind of function that the voltage making each monomer in set of cells possessed and capacity and charge-discharge characteristic reach unanimity.
Time properly functioning, CPU controls sampling switch S1～S5 (S1～S5 is generally high speed signal electrical switch) successively, depends on
The each batteries of secondary selection is to the input port of an AD changer, and after AD converts, CPU can obtain each economize on electricity successively
The voltage parameter in pond.If by contrast, CPU finds that a certain batteries voltage is inconsistent with other battery cell voltages, will control
Two adjacent switch Guan Bis of certain in gating switch K1～K5 (K1～K5 is generally high-current power switch) processed, differ voltage
The battery cell caused is linked into diverter (because the polarity of voltage of odd and even number is contrary, it is therefore desirable to carry out polarity reversing),
After diverter, battery cell inconsistent for voltage being linked into bi-directional DC-DC, CPU can control bi-directional DC-DC to this battery
It is charged or equalization discharge.In balancing procedure, CPU continues to monitor this battery cell electricity by voltage sample module 200
Pressure, once finds that voltage reaches requirement and stopping equalized.
To sum up, the equalization function accurate work of BMS to be made, then voltage sample module 200 monomer voltage is sampled accurate
Property is most important for BMS.For important signal, in the functional safety international standard of automotive electronics electrical system
The most common method introduced in ISO26262 is: the redundancy backup method of sampling, and the circuit that i.e. 2 functions of employing are identical is to single
Important signal is sampled, and increases the redundancy determination of sampled voltage.As in figure 2 it is shown, for increasing redundancy voltage acquisition function
Electrical block diagram.Figure increases and has a set of independent circuit, become including switch S11, S21, S31, S41, a S51 and AD
Parallel operation, is detected battery cell voltage by it.Two set circuit ensure the correctness of monomer voltage detection by mutually verification.Only when
2 set circuit to the difference of the collection value of same monomer voltage in certain scope, just startup active equalization battery management, significantly
Decrease the mistake balancing battery management that monomer voltage collection mistake causes, further increase the safe and reliable management of BMS.But it is this
Scheme can increase the quantity that switching switchs at double, and circuit is complicated.Particularly when management high-volume set of cells, such as 60 groups electricity
Pond is gone here and there, and the most a set of sampling needs 61 switch modules, two sets then to need 122 switch modules, and circuit connects excessively complicated, whole electricity
Pond manages the relatively costly of system.
[summary of the invention]
The technical problem to be solved is: make up above-mentioned the deficiencies in the prior art, proposes a kind of battery management system
System and the voltage sampling circuit used, method, can low cost and detect voltage sample abnormal conditions quickly and easily.
The technical problem of the present invention is solved by following technical scheme:
A kind of battery management system, including cascading the bidirectional DC-DC converter of connection, polarity reverser, battery choosing successively
Logical module, voltage sample module and processing module；The set of cells of described battery management system management includes N number of electricity being connected in series
Pond；Described voltage sample module includes sampling switch group and an AD changer；Described sampling switch group includes that N+1 sampling is opened
Closing, the first end of top n sampling switch is sequentially connected with the positive pole of N number of battery being connected in series, the first of N+1 sampling switch
End connects the negative pole of n-th battery；Second end of N+1 sampling switch alternately connects the positive input of an AD changer successively
End, negative input end；The outfan of a described AD changer connects an AD port of described processing module；Described voltage sample
Module also includes Redundanter schalter group；Described Redundanter schalter group includes the first Redundanter schalter and the second Redundanter schalter, described first superfluous
Remaining switch in parallel is at the two ends of the first sampling switch, and described second Redundanter schalter is connected in parallel on the two ends of N+1 sampling switch；Institute
State processing module for detection voltage of battery under the conducting of N+1 sampling switch, and detection is two Redundanter schalters cooperations
The voltage of battery under even number of samples switch conduction, whether exceeding setting threshold decision by the difference comparing relevant voltage is
No existence sampling abnormal conditions.
A kind of voltage sampling circuit for battery management system, including sampling switch group and an AD changer；Described
Sampling switch group includes N+1 sampling switch, and the first end of top n sampling switch is used for being sequentially connected with described battery management system
The positive pole of the N number of battery being connected in series in the set of cells of management, the first end of N+1 sampling switch connects n-th battery
Negative pole；Second end of N+1 sampling switch is for the most alternately connecting the AD changer in described battery management system
Positive input terminal, negative input end；The outfan of a described AD changer is for connecting the process in described battery management system
Oneth AD port of module；Described voltage sampling circuit also includes that Redundanter schalter group, described Redundanter schalter group include the first redundancy
Switch and the second Redundanter schalter, described first Redundanter schalter is connected in parallel on the two ends of the first sampling switch, described second Redundanter schalter
It is connected in parallel on the two ends of N+1 sampling switch.
A kind of voltage sampling method for battery management system, described battery management system includes cascading successively connection
Bidirectional DC-DC converter, polarity reverser, battery gating module, voltage sample module and processing module；Described battery management system
The set of cells of reason under the overall leadership includes N number of battery being connected in series；Described voltage sample module includes that sampling switch group and an AD become
Parallel operation；Described sampling switch group includes N+1 sampling switch, and the first end of top n sampling switch is sequentially connected with N number of being connected in series
The positive pole of battery, the first end of N+1 sampling switch connects the negative pole of n-th battery；Second end of N+1 sampling switch
Alternately connect the positive input terminal of an AD changer, negative input end successively；The outfan of a described AD changer connects described
Oneth AD port of processing module；Described voltage sampling method comprises the following steps: 1) at the two ends of described first sampling switch
First Redundanter schalter in parallel, the second Redundanter schalter in parallel at the two ends of N+1 sampling switch；2) detection is opened N+1 sampling
Close the voltage of the lower battery of conducting, and detection coordinates the electricity of battery under even number of samples switch conduction at two Redundanter schalters
By the difference comparing relevant voltage, whether pressure, exceed whether setting threshold decision exists sampling abnormal conditions.
The present invention is compared with the prior art and provides the benefit that:
The voltage sampling circuit used in the battery management system of the present invention, only increases on the basis of existing sample circuit
Two Redundanter schalters and by the corresponding comparison strategy of processing module in battery management system, i.e. can reach monomer voltage sampling
Redundancy detection.After relatively, find that voltage difference exceedes setting threshold value, can quickly judge to exist sampling abnormal conditions, quickly
Find inaccurate situation of sampling.Only close when two the voltage acquisition values compared, difference, in certain scope, just can open
Dynamic active equalization battery management, greatly reduces the mistake balancing battery management that monomer voltage collection mistake causes, improves further
BMS safe and reliable management.The circuit structure of voltage sampling circuit of the present invention is simple and practical, has high performance-price ratio, can save PCB
The advantages such as space.
[accompanying drawing explanation]
Fig. 1 is the structural representation of battery management system of the prior art；
Fig. 2 is the structural representation after increasing redundancy voltage acquisition function in battery management system of the prior art；
Fig. 3 is the structural representation of the battery management system of the specific embodiment of the invention one；
Fig. 4 is the structural representation of the battery management system of the specific embodiment of the invention two.
[detailed description of the invention]
Below in conjunction with detailed description of the invention and compare accompanying drawing the present invention is described in further details.
Detailed description of the invention one
As it is shown on figure 3, the battery management system of this detailed description of the invention includes the bidirectional DC-DC converter cascading connection successively
Device, polarity reverser, battery gating module 100, voltage sample module 200 and processing module.The electricity of battery management system management
Pond group includes 4 battery B1, B2, B3 and B4 being connected in series.Voltage sample module 200 includes that sampling switch group and an AD become
Parallel operation 201.Sampling switch group includes 5 sampling switch S1, S2, S3, S4 and S5, first end of sampling switch S1, S2, S3, S4
Being sequentially connected with the positive pole of N number of battery being connected in series, first end of sampling switch S5 connects the negative pole of the 4th battery B4.Sampling
Second end of switch S1, S2, S3, S4 and S5 alternately connects the positive input terminal of an AD changer, negative input end successively.Oneth AD
The outfan of changer 201 connects an AD port of processing module.
Voltage sample module 200 also includes Redundanter schalter group.Redundanter schalter group includes the first Redundanter schalter P1 and second superfluous
Remaining switch P2.First Redundanter schalter P1 is connected in parallel on the two ends of the first sampling switch S1, and the second Redundanter schalter P2 is connected in parallel on the 5th and adopts
The two ends of sample switch S5.Processing module is for detection voltage of battery under 5 sampling switch conductings, and detection is superfluous at two
Remaining switch coordinates the voltage of battery under even number of samples switch conduction, whether exceedes setting by the difference comparing relevant voltage
Whether threshold decision exists sampling abnormal conditions.
When two adjacent sampling switch conductings, CPU detects the first sampled voltage obtaining each battery respectively.Specifically
Ground,
Control conducting the first sampling switch S1 and the second sampling switch S2, the 1st string cell B1 carried out voltage sample,
Enter CPU after being sampled by AD and obtain the first sampled voltage V1 of cell B1.
Control conducting the second sampling switch S2 and the 3rd sampling switch S3, the 2nd string cell B2 carried out voltage sample,
Enter CPU after being sampled by AD and obtain the first sampled voltage V2 of cell B2.
Control conducting the 3rd sampling switch S3 and the 4th sampling switch S4, the 3rd string cell B3 carried out voltage sample,
Enter CPU after being sampled by AD and obtain the first sampled voltage V3 of cell B3.
Control conducting the 4th sampling switch S4 and the 5th sampling switch S5, the 4th string cell B4 carried out voltage sample,
Enter CPU after being sampled by AD and obtain the first sampled voltage V4 of cell B4.
First group of voltage sample value of each cell derived above.
When two Redundanter schalters P1, P2 coordinate even number of samples switch S2, S4 conducting, CPU detects first respectively
The voltage sum of battery and the sampled voltage of N battery and multiple adjacent cell.Specifically,
Control conducting the first Redundanter schalter P1 and the second sampling switch S2, the 1st string cell B1 carried out voltage sample,
Enter CPU after being sampled by AD and obtain the second sampled voltage V11 of cell B1.
Control conducting the first Redundanter schalter P1 and the 4th sampling switch S4, enter CPU after being sampled by AD and obtain the 1st, 2,3
Voltage sum V123 of string cell B1, B2, B3.
Control conducting the second sampling switch S2 and the second Redundanter schalter P2, enter CPU after being sampled by AD and obtain the 2nd, 3,4
Voltage sum V234 of string cell B2, B3, B4.
Control conducting the 4th sampling switch S4 and the second Redundanter schalter P2, the 4th string cell B4 carried out voltage sample,
Enter CPU after being sampled by AD and obtain the second sampled voltage V41 of cell B4.
Above, another group voltage sample value is i.e. obtained.
After CPU detects above-mentioned two groups of voltages, whether the difference comparing relevant voltage exceedes whether setting threshold decision exists
Sampling abnormal conditions.
Δ 1=V11-V1
Δ 2=V1+V2+V3-V123
Δ 3=V2+V3+V4-V234
Δ 4=V41-V4
If above-mentioned two groups sampling voltage differences in error allowed band (such as: 10mv), it is believed that sampling is just
Often.If beyond setting threshold value, then certainly existing sampling abnormal conditions.
In actual use,
If Δ 1 is in error allowed band, shows that the twice collection voltage of B1 is close, illustrate that the voltage gathered is all
The virtual voltage of corresponding B1, collection is accurately；If Δ 1 exceedes error allowed band, then it represents that gathering voltage twice has one
Or two is inaccurate, show that the voltage acquisition of B1 exists abnormal.Now, can directly judge on B1 battery, to there is collection different
Reason condition.
If Δ 2 exceedes error allowed band, because of Δ 2=V1+V2+V3-V123, then V1, in V2, V3, V123 any one
Forbidden all to cause Δ 2 to go beyond the scope, then any one switch fault corresponding all can cause sampling abnormal.If therefore Δ 2 exceeds standard,
Then inevitable is also to there are abnormal conditions.Now CPU is not turned on equalization function, in order to avoid there is equalization operation by mistake.In this case,
Voltage acquisition module 200 is only capable of gathering and judges to exist abnormal, but not can determine that is that the sampling of which joint cell has exception, as
Need to determine, follow-up corresponding detection method need to be coordinated to detect.But before detection further, the electricity of this detailed description of the invention
Pressure acquisition module can determine that voltage acquisition exists abnormal conditions in advance, and can abnormal conditions be locked in little scope
On the battery that several switches are corresponding.
In like manner, if Δ 3 can exceed error allowed band, then inevitable is also to there are abnormal conditions, and acquisition abnormity can shift to an earlier date
Determine, although just need to can determine that the sampling of the specifically cell of which joint has in conjunction with follow-up corresponding detection method
Abnormal, but can determine that voltage acquisition exists abnormal conditions in advance, and several opening of abnormal conditions can being locked in little scope
Close on corresponding battery.
If Δ 4 is in error allowed band, shows that the twice collection voltage of B4 is close, illustrate that the voltage gathered is all
The virtual voltage of corresponding B4, collection is accurately；If Δ 4 exceedes error allowed band, then it represents that gathering voltage twice has one
Or two is inaccurate, show that the voltage acquisition of B4 exists abnormal.Now, can directly judge on B4 battery, to there is collection different
Reason condition.
Above-mentioned voltage acquisition process is by analogizing, and when there is more battery, is also same newly-increased to arrange two redundancies and open
Close, coordinate the conducting that even number of samples switchs, detect that the voltage of two cells of corresponding head and the tail and centre are multiple
The voltage sum of voltage.By comparing voltage difference whether in threshold range, quickly determine whether there is abnormal conditions.Above-mentioned
Voltage acquisition scheme is applicable to 4 the most common string set of cells, 12 string set of cells, 24 string set of cells, 36 string batteries
Group, 48 string set of cells or 60 string set of cells.
To sum up, in this detailed description of the invention, the first Redundanter schalter and the second Redundanter schalter form Redundanter schalter group, the most logical
Abnormal conditions can be quickly judged in the setting crossing newly-increased two switches.Particularly high-volume checks that the collection of set of cells is the most accurate
Time really, each battery management system is set up two switches and can quickly determine the set of cells in which battery management system
Sampling exists abnormal, and without each cell in the set of cells in each battery management system being all provided with as in the past
Put Redundanter schalter to detect.The abnormal conditions of voltage acquisition can detect quickly and easily.
Based on above-mentioned voltage acquisition scheme, this detailed description of the invention also provides for the dynamic equalization side of battery management system
Method, includes following steps:
Step 1: adjusted the turn-on sequence of sampling switch by embedded Control software, detect the set of cells of each group of sequential series
In the voltage of each single battery.
Step 2: adjusted Redundanter schalter and the turn-on sequence of even number of samples switch by embedded Control software, detect phase
Answer voltage or the voltage sum of corresponding multiple battery of battery, obtain another each monomer voltage of group of redundancy.
The monomer voltage that CPU is gathered by comparison step 1 and step 2, if finding, 2 groups of voltage differences are more than the valve arranged
Value, now alarm voltage acquisition mistake abnormality alarming, does not start the dynamic equalization process of step 3 and 4.If 2 groups of voltage differences are little
In or equal to arrange threshold values, then enter step 3,4, start balancing battery management.As long as above-mentioned beyond arranging threshold value, gather
Abnormal, the most all report to the police.After the follow-up collection identifying which batteries has extremely, the corresponding switch changing collection.
Step 3: judged to need the item of the single battery too low or too high for voltage of independent charge or discharge by CPU.
Step 4: sent control command by CPU, controls to gate corresponding polar selecting switch group and collection bus is carried out pole
Property conversion, control to gate corresponding battery selector switch group simultaneously and carry out polarities match, and control two-way isolation and become that " parallel operation works
Direction, it would be desirable to individually the single battery too low or too high for voltage of discharge and recharge is linked into charge or discharge in collection bus, real
Existing energy transfer.
Step 5: repeat step 1)～3), until each single battery voltage respectively organized in the set of cells of sequential series is setting
In the range of fixed allowable error, reach dynamic equalization.
In this detailed description of the invention, the selection of device is as follows with function declaration:
1) sampling switch S1～S5 is high speed signal electrical switch
In actual application, quantity, according to concrete application, can be substantially larger than 5, and device is high pressure solid-state relay.At a high speed
Signal electron sampling switch S1～S5 concrete function in circuit is the battery cell that switching needs acquisition channel.Feature is:
Life-span is long, pressure height, and switch speed is fast.
2) AD changer is the accurate amplifier modulate circuit of high accuracy.
The voltage that switching is come to gather by AD changer concrete function in circuit carries out conditioning and is converted into CPU and can adopt
The voltage of collection.The collectable voltage range of CPU is 0～3.3vdc herein.
3) Redundanter schalter P1 and P2 increased is high speed signal electrical switch, and device model is high pressure solid relay
Device.
4) CPU is not limited to MCU or DSP, ARM etc...
CPU concrete function in circuit is the cell voltage value gathering two groups of redundancies, and comparing difference, it may be judged whether deposit
At acquisition abnormity.Additionally, CPU is additionally operable to dynamic equalization in battery management system, determine the item and of the highest cell
The item of low cell, and control the highest cell is discharged, minimum cell is charged, logical
Crossing " cutting high benefit low ", high efficiency energy shifts, and makes monomer battery voltage reach unanimity, makes up the diversity of battery.
Detailed description of the invention two
This detailed description of the invention is with the difference of embodiment one: in this detailed description of the invention, voltage sample mould
Block also includes the 2nd AD changer, thus the redundancy realizing AD changer is arranged.
As shown in Figure 4, the battery management system of this detailed description of the invention includes the bidirectional DC-DC converter cascading connection successively
Device, polarity reverser, battery gating module 100, voltage sample module 200 and processing module.In battery management system, voltage is adopted
Original mold block 200 includes sampling switch group and an AD changer 201.The composition of sampling switch group and with an AD changer
Connection etc. all identical with embodiment one, do not repeat at this.Except for the difference that, voltage sample module 200 also includes that the 2nd AD becomes
Parallel operation 202, the positive input terminal of the 2nd AD changer 202, negative input end connect respectively an AD changer 201 positive input terminal,
Negative input end, the outfan of the 2nd AD changer 202 connects the 2nd AD port of processing module CPU.So, redundant channel is logical
Cross another group AD changer and arrive CPU, utilize another road AD passage of CPU.
During work, there are two kinds of embodiments:
The first embodiment: when two adjacent sampling switch conductings, the first sampled voltage of each battery passes through
Oneth AD changer 201 arrives CPU, CPU and detects the magnitude of voltage of an AD port, collects first group of each cell
Voltage sample value V1, V2, V3 and V4.Concrete switch conduction situation and corresponding voltage are with detailed description of the invention one, at this not
Repeat.When two Redundanter schalters P1, P2 coordinate even number of samples switch S2, S4 conducting, adopting of the first battery and N battery
The voltage sum of sample voltage and multiple adjacent cell arrives CPU, CPU through the 2nd AD changer 202 and detects the 2nd AD port
The magnitude of voltage at place, collects second group of voltage sample data V11, V123, V234 and V41.Concrete switch conduction mated condition
And voltage, with in detailed description of the invention one, does not repeats at this accordingly.So, by redundancy backup the 2nd AD changer 202,
An AD changer 201 can be avoided to break down and to cause the situation of sampling exception, be accurately positioned abnormal failure position.
The second embodiment: when two adjacent sampling switch conductings, the first sampled voltage of each battery passes through
2nd AD changer 202 arrives CPU, CPU and detects the magnitude of voltage of the 2nd AD port, collects first group of each cell
Voltage sample value V1, V2, V3 and V4.When two Redundanter schalters P1, P2 coordinate even number of samples switch S2, S4 conducting, the
The voltage sum of one battery and the sampled voltage of N battery and multiple adjacent cell arrives through an AD changer 201
CPU, CPU detect the magnitude of voltage of an AD port, collect second group of voltage sample data V11, V123, V234 and V41.
So, by this embodiment, by redundancy backup the 2nd AD changer 202, an AD changer 201 can be avoided to break down
Cause the situation that sampling is abnormal, be accurately positioned abnormal failure position.
Preferably, synchronization implementation above two scheme, obtain 4 groups of different sampled datas.If the sampled data phase of 4 groups
The difference answered, in error zone of reasonableness, shows that sampling is accurately.The most just for too high or too low battery charging and discharging,
Start balance control function, thus substantially increase the accuracy of Balance route, it is to avoid the mistake caused because of AD changer fault is equal
Weighing apparatus action.
This detailed description of the invention, with embodiment one, can quickly judge abnormal feelings by the setting of newly-increased two switches
Condition.It is particularly suitable for high-volume when checking that the collection of set of cells is whether accurately, and is suitable for going here and there the pipe of the more set of cells of number
When reason gathers.The abnormal conditions of voltage acquisition can detect quickly and easily.Additionally, by the backup of the 2nd AD changer,
The mistake balancing actions caused because of AD changer fault can be avoided, substantially increase the accuracy of Balance route.
Above content is to combine concrete preferred implementation further description made for the present invention, it is impossible to assert
Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Without departing from making some replacements or obvious modification on the premise of present inventive concept, and performance or purposes are identical, all should be considered as
Belong to protection scope of the present invention.
Claims (10)
1. a battery management system, including cascading the bidirectional DC-DC converter of connection, polarity reverser, battery gating successively
Module, voltage sample module and processing module；The set of cells of described battery management system management includes N number of electricity being connected in series
Pond；Described voltage sample module includes sampling switch group and an AD changer；Described sampling switch group includes that N+1 sampling is opened
Closing, the first end of top n sampling switch is sequentially connected with the positive pole of N number of battery being connected in series, the first of N+1 sampling switch
End connects the negative pole of n-th battery；Second end of N+1 sampling switch alternately connects the positive input of an AD changer successively
End, negative input end；The outfan of a described AD changer connects an AD port of described processing module；It is characterized in that:
Described voltage sample module also includes Redundanter schalter group；Described Redundanter schalter group includes that the first Redundanter schalter and the second redundancy are opened
Closing, described first Redundanter schalter is connected in parallel on the two ends of the first sampling switch, and described second Redundanter schalter is connected in parallel on the N+1 sampling
The two ends of switch；Described processing module is for detection voltage of battery under N+1 sampling switch conducting, and detection is at two
Whether Redundanter schalter coordinates the voltage of battery under even number of samples switch conduction, exceeded by the difference comparing relevant voltage and set
Determine whether threshold decision exists sampling abnormal conditions.
Battery management system the most according to claim 1, it is characterised in that: described processing module is individual at N+1 for detection
The voltage of each battery of a described AD port under sampling switch conducting, and detection is two Redundanter schalters cooperation idols
The voltage of a battery of a described AD port or multiple cell voltage sum under the conducting of several sampling switch, by than
Whether the difference of relatively relevant voltage exceedes whether setting threshold decision exists sampling abnormal conditions.
Battery management system the most according to claim 1, it is characterised in that: described voltage sample module also includes the 2nd AD
Changer, the positive input terminal of described 2nd AD changer, negative input end connect respectively a described AD changer positive input terminal,
Negative input end, the outfan of described 2nd AD changer connects the 2nd AD port of described processing module.
Battery management system the most according to claim 3, it is characterised in that: described processing module is individual at N+1 for detection
The voltage of each battery of a described AD port under sampling switch conducting, and detection is two Redundanter schalters cooperation idols
The voltage of a battery of described 2nd AD port or multiple cell voltage sum under the conducting of several sampling switch, by than
Whether the difference of relatively relevant voltage exceedes whether setting threshold decision exists sampling abnormal conditions.
Battery management system the most according to claim 3, it is characterised in that: described processing module is individual at N+1 for detection
The voltage of each battery of described 2nd AD port under sampling switch conducting, and detection is two Redundanter schalters cooperation idols
The voltage of a battery of a described AD port or multiple cell voltage sum under the conducting of several sampling switch, by than
Whether the difference of relatively relevant voltage exceedes whether setting threshold decision exists sampling abnormal conditions.
6. the voltage sampling circuit for battery management system, it is characterised in that: include that sampling switch group and an AD become
Parallel operation；Described sampling switch group includes N+1 sampling switch, and the first end of top n sampling switch is used for being sequentially connected with described electricity
The positive pole of the N number of battery being connected in series in the set of cells of pond management system administration, the first end of N+1 sampling switch connects
The negative pole of n-th battery；Second end of N+1 sampling switch is for the most alternately connecting first in described battery management system
The positive input terminal of AD changer, negative input end；The outfan of a described AD changer is used for connecting described battery management system
In an AD port of processing module；Described voltage sampling circuit also includes that Redundanter schalter group, described Redundanter schalter group include
First Redundanter schalter and the second Redundanter schalter, described first Redundanter schalter is connected in parallel on the two ends of the first sampling switch, and described second
Redundanter schalter is connected in parallel on the two ends of N+1 sampling switch.
7., for a voltage sampling method for battery management system, described battery management system includes cascading the double of connection successively
To DC-DC converter, polarity reverser, battery gating module, voltage sample module and processing module；Described battery management system
The set of cells of management includes N number of battery being connected in series；Described voltage sample module includes sampling switch group and AD conversion
Device；Described sampling switch group includes N+1 sampling switch, and the first end of top n sampling switch is sequentially connected with N number of being connected in series
The positive pole of battery, the first end of N+1 sampling switch connects the negative pole of n-th battery；Second end of N+1 sampling switch depends on
The secondary alternately connection positive input terminal of the oneth AD changer, negative input end；The outfan of a described AD changer connects described place
Oneth AD port of reason module；It is characterized in that: described voltage sampling method comprises the following steps: 1) open in described first sampling
The two ends closed the first Redundanter schalter in parallel, the second Redundanter schalter in parallel at the two ends of N+1 sampling switch；2) detection is at N+1
Individual sampling switch turns on the voltage of lower battery, and detection coordinates electricity under even number of samples switch conduction at two Redundanter schalters
By the difference comparing relevant voltage, whether the voltage in pond, exceed whether setting threshold decision exists sampling abnormal conditions.
Voltage sampling method the most according to claim 7, it is characterised in that: described step 2) for detecting N+1 sampling
The voltage of each battery of a described AD port under switch conduction, and detection coordinate even number at two Redundanter schalters
The voltage of a battery of a described AD port or multiple cell voltage sum under sampling switch conducting, by comparing phase
Whether the difference answering voltage exceedes whether setting threshold decision exists sampling abnormal conditions.
Voltage sampling method the most according to claim 7, it is characterised in that: described step 1) it is additionally included in described voltage and adopts
Between original mold block and the 2nd AD port of described processing module, redundancy arranges the 2nd AD changer；Described step 2) for detecting at N+
The voltage of each battery of a described AD port under 1 sampling switch conducting, and detection is two Redundanter schalters cooperations
The voltage of a battery of described 2nd AD port or multiple cell voltage sum under even number of samples switch conduction, logical
Cross and compare the difference of relevant voltage and whether exceed whether setting threshold decision exists sampling abnormal conditions.
Voltage sampling method the most according to claim 7, it is characterised in that: described step 1) it is additionally included in described voltage
Between sampling module and the 2nd AD port of described processing module, redundancy arranges the 2nd AD changer；Described step 2) exist for detection
The voltage of each battery of described 2nd AD port under the conducting of N+1 sampling switch, and detection joins at two Redundanter schalters
Close the voltage of a battery of a described AD port under even number of samples switch conduction or multiple cell voltage sum,
Whether exceed whether setting threshold decision exists sampling abnormal conditions by the difference comparing relevant voltage.
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