CN104410111B - Voltage acquisition line impedence backoff algorithm on battery management system - Google Patents
Voltage acquisition line impedence backoff algorithm on battery management system Download PDFInfo
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- CN104410111B CN104410111B CN201410604882.2A CN201410604882A CN104410111B CN 104410111 B CN104410111 B CN 104410111B CN 201410604882 A CN201410604882 A CN 201410604882A CN 104410111 B CN104410111 B CN 104410111B
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The present invention provides voltage acquisition line impedence backoff algorithm on a kind of battery management system, comprises the steps：First, the magnitude of voltage of each cell in set of cells is periodically detected, the magnitude of voltage exception of certain cell is judged whether, if there is the magnitude of voltage exception of certain cell, into step 2, this flow process is otherwise exited；2nd, on-resistance compensation circuit, the voltage acquisition circuit to collecting the abnormal voltage value apply continuous current；3rd, the corresponding voltage acquisition circuit of abnormal voltage value collection voltages value again, judges whether the magnitude of voltage that this collects again is still abnormal, if still abnormal, into step 4, otherwise exits this flow process；Four：The power supply of force disconnect set of cells or the output power of reduction set of cells.The present invention can have found the exception of gathered monomer battery voltage in time, and without the need for clearing up dust manually excluding exception, while enhancing battery product to the adaptability of adverse circumstances, stability and reliability.
Description
Technical field
The present invention relates to battery management system field, and in particular on a kind of battery management system, voltage acquisition line impedence is mended
Repay algorithm.
Background technology
Current overwhelming majority BMS（Battery management system）The mode of voltage acquisition is the BMU by BMS（From plate）On electricity
Pressure acquisition chip gathers monomer battery voltage by medium of voltage acquisition line, and the cell voltage value for collecting is reported BMS
BCU（Mainboard）, battery bag is directly controlled by BCU, while interacting with car load.
However, use environment of the battery bag on the public transport big bus or mine car in suburb is severe, the BMS voltages inside battery bag
On the harness connector plug of gathering line, easy accumulation dust, causes contact resistance to increase, so as to further result in BMS in voltage acquisition
There is pressure drop on voltage acquisition line, the monomer battery voltage for also resulting in BMS collections is more low than the actual monomer battery voltage of battery,
BMS collects low false monomer battery voltage, can make the action for protecting battery in advance, such as battery management in driving conditions
System causes car load to be lain prone and car or forces low speed etc. to protect battery to force power-off, most affects the use of battery bag at last, and
In this case, need to tear open battery bag, the state of individual inspiration battery, the reason for carrying out failure judgement and occur, while needing cleaning
Dust inside battery bag fixing a breakdown, to allow battery bag resumption of service.
Fig. 1 gives the technical Analysis schematic diagram that accumulation dust on voltage acquisition line causes battery bag failure, such as Fig. 1 institutes
Show, R1-R5 is represented from battery electrode column to the resistance BMS acquisition circuits（Resistance as on voltage acquisition line）, C1-C4 tables
Show cell, if the resistance value that accumulation has dust, R1 or R5 on the voltage acquisition line represented by R1 or R5 increases
Greatly, it is assumed that the resistance value of R2 and R4 is normal, due to the partial pressure of R1 and R5, then BMS collects the voltage of C1 or C4 can be than reality
Border battery voltage value is low, namely causes collection single-unit magnitude of voltage low；If accumulation has ash on the voltage acquisition line represented by R2
Dirt, then the resistance value increase of R2, it is assumed that the resistance value of R1 and R3 is normal, due to the partial pressure of R2, then BMS collects C1 or C2
Voltage can be lower than actual cell voltage, namely cause gather two adjacent sections single-unit low voltage.
The content of the invention
The technical problem to be solved is to provide voltage acquisition line impedence compensation on a kind of battery management system and calculates
Method, can be by carrying out voltage compensation on voltage acquisition line, it is to avoid above-mentioned failure occurs, and does not affect normally making for battery bag
With.
Technical scheme comprises the steps：
Step one, the magnitude of voltage for being periodically detected each cell in set of cells, judge whether certain monomer electricity
The magnitude of voltage exception in pond, if there is the magnitude of voltage exception of certain cell, into step 2, otherwise exits this flow process；
Step 2, on-resistance compensation circuit, the voltage acquisition circuit to collecting the abnormal voltage value apply constant current
Electric current；
Step 3, the corresponding voltage acquisition circuit of abnormal voltage value collection voltages value again, judges that this gathers again
Whether the magnitude of voltage for obtaining is still abnormal, if still abnormal, into step 4, otherwise exits this flow process；
Step 4：The power supply of force disconnect set of cells or the output power of reduction set of cells.
Preferably, the magnitude of voltage exception for judging whether certain cell, if there is certain cell
Magnitude of voltage exception, then the concrete grammar into step 2 be：In the magnitude of voltage of each cell described in judging, if there is electricity
Pressure value is less than threshold value Th1 or judges that the difference in the set of cells between highest cell voltage value and minimum cell voltage value is
It is no higher than threshold value Th2, if there is the magnitude of voltage of certain cell less than highest monomer electricity in threshold value Th1 or the set of cells
Difference between pressure value and minimum cell voltage value is higher than threshold value Th2, then the magnitude of voltage or described minimum less than threshold value Th1
Cell voltage value is abnormal voltage value, then into step 2.
Preferably, whether the magnitude of voltage for judging that this collects again is still abnormal, if still abnormal, enters step
Rapid four concrete grammar is：Judge whether the magnitude of voltage for collecting again is less than threshold value Th1 or this collects again
The difference of magnitude of voltage and certain cell voltage value whether be higher than threshold value Th2, if the magnitude of voltage for collecting again is less than
The difference of threshold value Th1 or the magnitude of voltage that collects again and certain cell voltage value higher than threshold value Th2, then into step
Four.
Preferably, the persistent period of the described pair of voltage acquisition circuit applying continuous current for collecting the abnormal voltage value
For the 5-15 seconds.
Preferably, threshold value Th1 is 2.0v-2.5v, and threshold value Th2 is 100mv-400mv.
The invention has the advantages that and beneficial effect：
1st, by optimization software control strategy, acquisition circuit is applied after electric current using on-resistance compensation circuit, contact
Resistance increases with electric current and reduces, and promotes collection voltages to recover normal, it is to avoid BMS false judgments, the collection for strengthening BMS are fault-tolerant
Function, runs car load more stable.
2nd, staggering time performs the collection of impedance-compensated and monomer voltage, and caused by will not making on-resistance compensation, voltage is adopted
Collection error.
3rd, by voltage acquisition line impedence backoff algorithm on battery management system, in cleaning dust of not unpacking to battery bag
In the case of the failure of exclusion, it is ensured that the normal use of battery bag, while strengthening adaptability, stability of the product to adverse circumstances
And reliability.
Description of the drawings
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, embodiment will be described below needed for want it is attached
Figure does simple introduction, it should be apparent that, drawings discussed below is only some embodiments of the present invention, general for this area
For logical technical staff, on the premise of not paying creative work, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is battery bag failure principle analysis figure in prior art.
Fig. 2 is the circuit theory diagrams of impedance-compensated algorithm of the invention.
Specific embodiment
The specific embodiment of the embodiment of the present invention is elaborated with reference to Figure of description.
The present invention reduces this characteristic with electric current increase using the contact resistance of dust, by tiring out on voltage acquisition line
The mode is powered by long-pending dust come reduce the contact resistance of dust and carry out it is impedance-compensated so that collect monomer electricity
The voltage in pond is normal value.Specific embodiments of the present invention are：
As shown in Fig. 2 each cell Cell1 of set of cells, Cell2 ... Celln respectively by switch T1, T2 ... Tn
Be connected to DC current source DC, the span of the output current value of DC current source is 30-300mA, and each switch with
Controller connects.Controller regularly detect every some cycles t0 the magnitude of voltage U1 of each cell for being collected, U2 ...
Un, wherein t0 values are 50-900mS, it is assumed that the set of cells selected in the present embodiment is lithium battery group, then the spy according to lithium battery
Property consider, set low pressure threshold Th1 that the lithium battery normally can be used as 2.5v, those skilled in the art can also root
Different low pressure thresholds are set according to the type difference of the set of cells for being used, the span of the low pressure threshold is generally
2.0v -2.5v, controller judged to each monomer battery voltage according to set threshold value, detects whether there is a certain list
The magnitude of voltage of body battery is less than 2.5v.Hypothesis detects the magnitude of voltage U2 collected from Cell2 less than 2.5v, then illustrate from
There is exception in the voltage collected by Cell2, now need the voltage acquisition circuit to Cell2 to carry out impedance-compensated, and controller is sent out
Go out command signal to promote to switch T1 and T2 closures, with by voltage acquisition circuits of the DC current source DC to cell Cell2
Apply electric current.Similarly, if magnitude of voltage Ui exceptions, wherein 1≤i≤n, then controller controlling switch T (i-1) and Ti are closed or disconnected
Open.In order to avoid voltage acquisition error, the persistent period for generally applying electric current to voltage acquisition circuit is unsuitable long, usually 5-
15s, sets DC current source and applies the time of electric current to voltage acquisition circuit as 10s, T1 and T2 is switched after 10s in the present embodiment
Automatically disconnect, impedance-compensated process terminates, the resistance of voltage acquisition circuit recovers normal, keeps stable in short time voltage, this
When the magnitude of voltage that collects be accurate data, do not result in voltage acquisition error, therefore controller gather the monomer of Cell2 again
Magnitude of voltage detected, judge it is impedance-compensated after the U2 values that collected whether be still below threshold value 2.5v, if being still below 2.5v,
Judge that the virtual voltage of battery Cell2 is low, need by forcing power-off or restriction output to protect battery, if not low
In 2.5v, then judge that the virtual voltage of battery Cell2 is normal.
In addition to aforesaid way, by another way, the present invention also can judge whether gathered cell voltage value is abnormal, should
Mode is：Controller compares each monomer battery voltage for being collected, if highest cell voltage value and minimum cell voltage value
Between difference be more than or equal to another threshold value Th2, then abnormal, the basis in the present embodiment that illustrates that the minimum cell voltage value is present
Threshold value Th2 is set as 200mv by the characteristic of lithium battery, and the general span of threshold value Th2 is 100mv-400mv, controller control
The switch closure on the acquisition circuit of the cell corresponding to minimum cell voltage value is made, with to the electricity on the acquisition circuit
Resistance carries out impedance-compensated.
It should be noted that the monomer voltage collection and on-resistance compensation in the present invention is that staggering time is performed, no
Voltage acquisition error caused by on-resistance compensation can be made.When on-resistance compensation function, electricity in voltage acquisition circuit, is had
Stream flows through, and after applying electric current, contact resistance increases with electric current and reduces, and resistance value now is unstable also in change, the electricity
The voltage shared in voltage acquisition circuit by resistance also can be unstable, ultimately results in voltage acquisition and is forbidden, so mending in impedance
Voltage acquisition and detection are not carried out when repaying.In the of short duration time after impedance compensation function is completed, now impedance compensation function
Terminate, the resistance of acquisition circuit is recovered normal, in short time voltage, keep stable, the magnitude of voltage for now collecting is accurate
Data, do not result in voltage acquisition error.
The present invention carries out voltage occurring by way of abnormal monomer voltage acquisition circuit applies electric current to magnitude of voltage
Gathering line it is impedance-compensated, and resurvey it is impedance-compensated after magnitude of voltage, according to the magnitude of voltage collected after impedance-compensated
Judge whether reality needs pressure power-off protection to be carried out to battery, it is to avoid BMS collects the monomer battery voltage of low falseness
After force power-off, and affect the normal use of battery bag.The present invention can timely and reliably have found gathered cell electricity
The exception of pressure, and without the need for clearing up dust manually excluding exception, while enhancing battery product to the adaptability of adverse circumstances, steady
Qualitative and reliability.
Embodiment described above only expresses the present invention preferred embodiment, and its description is more concrete and detailed, but
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for the ordinary skill people of this area
For member, without departing from the inventive concept of the premise, some deformations and improvement can also be made, these belong to the present invention's
Protection domain.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (5)
1. voltage acquisition line impedence backoff algorithm on a kind of battery management system, it is characterised in that comprise the steps：
Step one, the magnitude of voltage for being periodically detected each cell in set of cells, judge whether certain cell
Magnitude of voltage exception, if there is the magnitude of voltage exception of certain cell, into step 2, otherwise exits this flow process；
Step 2, on-resistance compensation circuit, the voltage acquisition circuit to collecting the abnormal voltage value apply continuous current,
After applying continuous current reaches the persistent period, impedance-compensated process terminates, into step 3；
Step 3, the corresponding voltage acquisition circuit of abnormal voltage value collection voltages value again, judges that this collects again
Magnitude of voltage it is whether still abnormal, if still abnormal, into step 4, otherwise exit this flow process；
The output power of step 4, the power supply of force disconnect set of cells or reduction set of cells.
2. voltage acquisition line impedence backoff algorithm on a kind of battery management system according to claim 1, it is characterised in that
The magnitude of voltage exception for judging whether certain cell, if there is the magnitude of voltage exception of certain cell, enters
The concrete grammar for entering step 2 is：In the magnitude of voltage of each cell described in judging, if there is magnitude of voltage less than threshold value Th1
Or whether difference in the set of cells between highest cell voltage value and minimum cell voltage value is judged higher than threshold value Th2,
If there is the magnitude of voltage of certain cell less than highest cell voltage value and minimum monomer in threshold value Th1 or the set of cells
Difference between magnitude of voltage is higher than threshold value Th2, then the magnitude of voltage or the minimum cell voltage value less than threshold value Th1 is different
Normal magnitude of voltage, into step 2.
3. voltage acquisition line impedence backoff algorithm on a kind of battery management system according to claim 1, it is characterised in that
Whether the magnitude of voltage for judging that this collects again is still abnormal, if still abnormal, into the concrete grammar of step 4
For：Judge magnitude of voltage that this collects again whether less than threshold value Th1 or the magnitude of voltage that collects again and certain
Whether the difference of cell voltage value is higher than threshold value Th2, if the magnitude of voltage for collecting again be less than threshold value Th1 or this again
The secondary magnitude of voltage for collecting is higher than threshold value Th2 with the difference of certain cell voltage value, then into step 4.
4. voltage acquisition line impedence backoff algorithm on a kind of battery management system according to Claims 2 or 3, its feature exist
In the persistent period of the described pair of voltage acquisition circuit applying continuous current for collecting the abnormal voltage value is the 5-15 seconds.
5. voltage acquisition line impedence backoff algorithm on a kind of battery management system according to Claims 2 or 3, its feature exist
In threshold value Th1 is 2.0v-2.5v, and threshold value Th2 is 100mv-400mv.
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| CN201410604882.2A CN104410111B (en) | 2014-11-03 | 2014-11-03 | Voltage acquisition line impedence backoff algorithm on battery management system |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478946B (en) * | 2016-08-29 | 2020-09-18 | 宝沃汽车（中国）有限公司 | Diagnosis method and system for single voltage acquisition wiring harness of power battery and vehicle |
| CN109116239A (en) * | 2018-06-06 | 2019-01-01 | 安徽锐能科技有限公司 | The detection system of monomer voltage for battery pack |
| CN108896929B (en) * | 2018-07-26 | 2021-10-22 | 安徽锐能科技有限公司 | Method for measuring cell voltage of battery pack |
| KR20200127638A (en) * | 2019-05-03 | 2020-11-11 | 주식회사 엘지화학 | Apparatus and method for diagnosing battery cell |
| CN113640686B (en) * | 2021-07-12 | 2024-03-12 | 杭州高特电子设备股份有限公司 | Fault self-diagnosis device and method |
| CN116540113B (en) * | 2023-06-26 | 2023-10-24 | 深圳市好盈科技股份有限公司 | Prediction method and device for battery voltage of model airplane electronic speed regulator |
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