CN110065394A - A kind of power battery monomer low-voltage protection method and system - Google Patents
A kind of power battery monomer low-voltage protection method and system Download PDFInfo
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- CN110065394A CN110065394A CN201910249190.3A CN201910249190A CN110065394A CN 110065394 A CN110065394 A CN 110065394A CN 201910249190 A CN201910249190 A CN 201910249190A CN 110065394 A CN110065394 A CN 110065394A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/04—Cutting off the power supply under fault conditions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The present invention relates to a kind of power battery monomer low-voltage protection method and systems, the described method comprises the following steps: charge and discharge control: VCU carries out charge and discharge control to motor according to the charge-discharge electric power received；The judgement of level-one under-voltage fault: whether BMS judges minimum monomer voltage in the first preset time less than the first preset voltage value；It is electrically cut off if so then execute charge and discharge: according to the operating mode of BMS, cutting off the charge and discharge of single battery；If it is not, then executing the judgement of second level under-voltage fault: BMS judge minimum monomer voltage in the second preset time whether less than the second preset voltage value, second preset voltage value is greater than first preset voltage value；If so, executing reduces power: charge-discharge electric power is reduced to the presupposition multiple of original charge-discharge electric power by BMS, and the charge-discharge electric power after reduction is sent to VCU；If it is not, being then back to charge and discharge control.It avoids making the erroneous judgement of paired fault because the acquisition of monomer voltage receives the interference of periphery electromagnetic field.
Description
Technical field
The present invention relates to electric car field, in particular to a kind of power battery monomer low-voltage protection method and system.
Background technique
Electric car (BEV) refers to using vehicle power supply as power, with motor driven wheels travel, meets road traffic, peace
The vehicle of full regulation requirements.Since effect on environment is smaller with respect to orthodox car, its prospects are considered optimistic wildly, but current skill
Art is still immature.And for electric car, power battery is vital, if the monomer lower terminal voltage of battery not by
To being effectively protected, it mainly will appear over-discharge, entire battery pack all by failure and cannot again be used；In addition if protected not
When meeting breaks high pressure suddenly, causes to shut down, and causes very inconvenient and trailer expense loss to client；Excessive protection meeting
Occur also will appear the deficiency of continuation of the journey, or continuation of the journey and SOC (State Of Charge, state-of-charge) do not correspond to.Although and existing
In some technologies, application No. is CN201711227691.9 to disclose a kind of electric car discharge prevention method, simply by
The case where minimum monomer voltage judged, but since voltage acquisition will receive the interference of periphery electromagnetic field, and there are fluctuations, may
The case where in the presence of erroneous judgement.
Summary of the invention
For this reason, it may be necessary to provide a kind of power battery monomer low-voltage protection method and system, solves existing power battery and protect
The defect of shield and by minimum monomer voltage judgement be easy to appear error the problem of.
To achieve the above object, a kind of power battery monomer low-voltage protection method is inventor provided, comprising the following steps:
Signal acquisition: BMS acquires the monomer voltage of power battery in real time；
Voltage calculates: and minimum monomer voltage is calculated according to the monomer voltage；
Power calculation: BMS calculates corresponding charge-discharge electric power according to minimum monomer voltage, and the charge-discharge electric power of calculating is sent out
It send to VCU；
Charge and discharge control: VCU carries out charge and discharge control to motor according to the charge-discharge electric power received；
The judgement of level-one under-voltage fault: BMS judges whether minimum monomer voltage is default less than first in the first preset time
Voltage value；
It is electrically cut off if so then execute charge and discharge: according to the operating mode of BMS, cutting off the charge and discharge of single battery；
If it is not, then executing the judgement of second level under-voltage fault: BMS judges whether minimum monomer voltage is small in the second preset time
In the second preset voltage value, second preset voltage value is greater than first preset voltage value；
If so, executing reduces power: charge-discharge electric power is reduced to the presupposition multiple of original charge-discharge electric power by BMS, and
Charge-discharge electric power after reduction is sent to VCU；
If it is not, being then back to charge and discharge control.
It advanced optimizes, the voltage calculates further include: calculates highest monomer voltage according to the monomer voltage；
Further include pressure difference screening before the first under-voltage judgement: calculating the electricity of highest monomer voltage and minimum monomer voltage
Pressure difference is pressed, judges whether the voltage difference is greater than threshold pressure differential；
If so then execute pressure difference analysis: analysis is monomer voltage acquisition abnormity or electric core aging, and will be analyzed in result
Report and storage；
If otherwise executing the judgement of level-one under-voltage fault.
It advanced optimizes, further includes the under-voltage event of three-level between the level-one under-voltage fault judgement and the judgement of second level under-voltage fault
Barrier judgement:
Judge whether minimum monomer voltage is less than third preset voltage value, the default electricity of the third in third preset time
Pressure value is greater than the first preset voltage value, less than the second preset voltage value；
If so then execute reduction electric current: BMS reduces electric current, when current reduction to pre-set current value, cutting electric discharge；
If it is not, then executing the judgement of second level under-voltage fault.
It advanced optimizes, first preset time is greater than third preset time, and the third preset time is greater than second
Preset time.
It advanced optimizes, the signal acquisition further include: acquire the monomer temperature value of power battery；
The power calculation specifically includes: according to the minimum monomer voltage and monomer temperature value, searching to obtain to SOP table
Corresponding charge-discharge electric power, and the charge-discharge electric power found is sent to VCU.
Inventor additionally provides another technical solution: a kind of power battery monomer undervoltage protection system, including BMS and
VCU；
The BMS includes signal acquisition module, power computation module and fault diagnosis module；
The signal acquisition module for acquiring the monomer voltage of power battery in real time；
The fault diagnosis module is also used to calculate minimum monomer voltage according to the monomer voltage acquired in real time, according to described
Minimum monomer obtains the under-voltage grade of monomer, and the under-voltage grade of monomer includes level-one under-voltage fault and second level under-voltage fault, described
Level-one under-voltage fault is for minimum monomer voltage less than the first preset voltage value, the second level under-voltage fault in the first preset time
For minimum monomer voltage less than the second preset voltage value in the second preset time, when the under-voltage grade of monomer is level-one under-voltage fault
When, then according to the operating mode of BMS, the charge and discharge of single battery are cut off, when the under-voltage grade of monomer is second level under-voltage fault, then
Charge-discharge electric power will be reduced to the presupposition multiple of original charge-discharge electric power, and the charge-discharge electric power after reduction is sent to VCU；
The power computation module is used to calculate corresponding charge-discharge electric power according to minimum monomer voltage, by the charge and discharge of calculating
Electrical power is sent to VCU；
The VCU is used to carry out charge and discharge control to motor according to the charge-discharge electric power received.
It advanced optimizing, the fault diagnosis module is also used to calculate highest monomer voltage according to the monomer voltage,
The voltage difference for calculating highest monomer voltage and minimum monomer voltage, judges whether the voltage difference is greater than threshold pressure differential, if
Be to execute pressure difference analysis: analysis is monomer voltage acquisition abnormity or electric core aging, and analysis result is reported and stored.
It advanced optimizes, the under-voltage grade of monomer further includes three-level under-voltage fault, and the three-level under-voltage fault is minimum
Monomer voltage is less than third preset voltage value in third preset time；
The fault diagnosis module is also used to when the under-voltage grade of monomer be three-level under-voltage fault, then reduces electric current, work as electric current
When being reduced to pre-set current value, cutting electric discharge.
It advanced optimizes, first preset time is greater than third preset time, and the third preset time is greater than second
Preset time.
It advanced optimizes, the signal acquisition module is also used to acquire the monomer temperature value of power battery；
The power computation module is used to search to obtain to SOP table according to the minimum monomer voltage and monomer temperature value
Corresponding charge-discharge electric power, and the charge-discharge electric power found is sent to VCU.
It is different from the prior art, above-mentioned technical proposal, by acquiring the monomer voltage of power battery, and is calculated minimum
Monomer voltage, by judging whether minimum monomer voltage is lower than the first preset voltage value in the first preset time, if so, sentencing
There is serious under-voltage fault in disconnected power battery, then disconnects power battery charge and discharge, carries out under-voltage protection to power battery, if
It is no, then judge whether minimum monomer voltage is lower than the second preset voltage value in the second preset time, if so, original is filled
Discharge power reduce it is general, although also allowing to discharge, more electricity can be put, prevent battery so that monomer voltage is smaller
Automobile is shut down, and battery cell voltage under-voltage protection also considers that the operating condition of charging does not allow in the case where monomer is especially low
Electric discharge does not also allow to charge simultaneously, prevents the destruction that irreversible electrochemistry level is caused to battery；And in addition to minimum list
Bulk voltage is judged, by coming together to judge in conjunction with the persistent anomaly time, is avoided because the acquisition of monomer voltage receives periphery
The erroneous judgement of paired fault is made in the interference of electromagnetic field.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of power battery monomer low-voltage protection method described in specific embodiment；
Fig. 2 is another flow diagram of power battery monomer low-voltage protection method described in specific embodiment；
Fig. 3 is a kind of structural schematic diagram of power battery monomer undervoltage protection system described in specific embodiment；
Fig. 4 is a kind of structural schematic diagram of BMS described in specific embodiment；
Fig. 5 is a kind of process schematic that fault diagnosis module described in specific embodiment judges level-one under-voltage fault；
Fig. 6 is a kind of process schematic that fault diagnosis module described in specific embodiment judges second level under-voltage fault；
Fig. 7 is a kind of process schematic that fault diagnosis module described in specific embodiment judges three-level under-voltage fault.
Description of symbols:
310,BMS；
310, signal acquisition module,
312, fault diagnosis module,
313, power computation module,
320, VCU,
330、MCU。
Specific embodiment
Technology contents, construction feature, the objects and the effects for detailed description technical solution, below in conjunction with specific reality
It applies example and attached drawing is cooperated to be explained in detail.
Noun occurred in embodiment is explained at this first:
VCU:Vehicle Control Unit, full-vehicle control unit
BMS:Battery Management System, battery management system
MCU:Motor Control Unit, electric machine controller
SOP:State Of Power, charge-discharge electric power state
Referring to Fig. 1, power battery monomer low-voltage protection method described in the present embodiment, comprising the following steps:
Signal acquisition S110:BMS acquires the monomer voltage of power battery in real time；
Voltage calculates S120: and minimum monomer voltage is calculated according to the monomer voltage；
Power calculation S130:BMS calculates corresponding charge-discharge electric power according to minimum monomer voltage, by the charge and discharge electric work of calculating
Rate is sent to VCU；
Charge and discharge control S140:VCU carries out charge and discharge control to motor according to the charge-discharge electric power received；
Level-one under-voltage fault judges that S150:BMS judges minimum monomer voltage in the first preset time whether less than first
Preset voltage value；
S151 is electrically cut off if so then execute charge and discharge: according to the operating mode of BMS, cutting off the charge and discharge of single battery；
If it is not, then executing second level under-voltage fault judges that S160:BMS judges that minimum monomer voltage is in the second preset time
It is no less than the second preset voltage value, second preset voltage value is greater than first preset voltage value；
If so, executing reduces default times that charge-discharge electric power is reduced to original charge-discharge electric power by power S161:BMS
Number, and the charge-discharge electric power after reduction is sent to VCU；
If it is not, being then back to charge and discharge control S140.
BMS acquires the monomer voltage of power battery in real time, wherein monomer voltage collection period is 100ms；And according to adopting
Minimum monomer voltage Vmin is calculated in the monomer voltage collected, wherein can according to calculated minimum monomer voltage Vmin,
Corresponding charge-discharge electric power is calculated, and the charge-discharge electric power is sent to VCU by CAN, VCU is according to the charge and discharge received
Electrical power carries out charge and discharge control to motor, specific to be requested such as VCU according to the operating condition of the charge-discharge electric power and vehicle received
The operating mode of BMS, and the request of torque and revolving speed is sent to MCU；Request that MCU according to the torque and revolving speed received
Control the revolving speed of motor；Wherein, under-voltage fault judgement is carried out according to the minimum monomer voltage Vmin being calculated；One is carried out first
Whether grade under-voltage fault judgement, judge minimum monomer voltage Vmin in the first preset time t 1 less than the first preset voltage value
V1, i.e., as Vmin≤V1, t starts timing, and during timing, when Vmin > V1, then t sets 0, and works as t > t1, then sets
There is level-one under-voltage fault, i.e. most serious monomer failure in power battery, then BMS is that direct block system relay is cut in security consideration
The charge and discharge of disconnected power battery, i.e., improper minimum monomer voltage Vmin is in the first preset time t 1 less than the first preset voltage value
V1 disconnects charge relay when BMS is in charge mode, terminates charging, when BMS is in discharge mode, disconnects main positive relay,
Terminate electric discharge, battery cell voltage under-voltage protection also considers that the operating condition of charging does not allow to discharge in the case where monomer is especially low
Also do not allow to charge simultaneously, prevents the destruction for causing irreversible electrochemistry level to battery；And work as minimum monomer voltage Vmin
Whether > V1 then carries out second level under-voltage fault judgement, judge minimum monomer voltage Vmin in the second preset time t 2 less than
Two preset voltage value V2, i.e., as Vmin≤V2, t starts timing, and during timing, when Vmin > V2, then t sets 0, and works as
T > t2 then sets power battery and second level under-voltage fault occurs, although and at this point, monomer voltage is smaller, also allow to put more
Electricity, then charge-discharge electric power is reduced, charge-discharge electric power is reduced to the half of original charge-discharge electric power, i.e., by charge and discharge
Electrical power is reduced to the half of the corresponding charge-discharge electric power of minimum monomer voltage Vmin, and power battery is allow put more
Electricity, and the monomer voltage for reminding user current is lower, prevents electric car from shutting down；And in addition to minimum monomer voltage
Judged, by coming together to judge in conjunction with the persistent anomaly time, is avoided because the acquisition of monomer voltage receives periphery electromagnetic field
Interference, make the erroneous judgement of paired fault.
Wherein, in order to obtaining accurate charge-discharge electric power, the signal acquisition further include: acquire the list of power battery
Body temperature angle value；The power calculation specifically includes: according to the minimum monomer voltage and monomer temperature value, searching SOP table
VCU is sent to corresponding charge-discharge electric power, and by the charge-discharge electric power found.By the monomer temperature for acquiring power battery
Value, wherein the period of monomer temperature value acquisition is 1S；According to minimum monomer voltage and monomer temperature value, SOP table is searched to obtain
Corresponding charge-discharge electric power, available accurate charge-discharge electric power allow VCU according to accurate charge-discharge electric power to motor
Carry out optimal control charge and discharge.
Referring to Fig. 2, in the present embodiment, power battery be likely to occur due to electric core aging occur gathering line loosen or
The situation of voltage acquisition exception needs to screen the monomer pressure difference of power battery, and the voltage calculates further include: according to institute
It states monomer voltage and calculates highest monomer voltage；
Further include pressure difference screening S170 before the first under-voltage judgement S150: calculating highest monomer voltage and minimum monomer
The voltage difference of voltage, judges whether the voltage difference is greater than threshold pressure differential；
Analyze S171 if so then execute pressure difference: analysis is monomer voltage acquisition abnormity or electric core aging, and analysis is tied
Fruit reports and stores；
If otherwise executing level-one under-voltage fault judges S150.
According to collected monomer voltage, highest monomer voltage and minimum monomer voltage is calculated,
According to collected monomer voltage, highest monomer voltage and minimum monomer voltage are calculated, highest is then calculated
Voltage difference between monomer voltage and minimum monomer voltage, judges whether calculated voltage difference is greater than the pressure difference threshold of setting
Value then carries out failure cause judgement to monomer pressure difference when voltage difference is greater than threshold pressure differential extremely, analysis be acquisition abnormity or
The problem of electric core aging, and analysis result is reported and stored, allow to carry out corresponding event for monomer pressure difference failure
Barrier processing.The failure mode for distinguishing monomer pressure difference is increased, more accurately the reason of positioning failure, preferably checks problem and guarantor
Protect battery.
Referring to Fig. 2, in the present embodiment, and it may cause relay adhesion in high current block system relay, described one
It further includes that three-level under-voltage fault judges S180 between S160 that grade under-voltage fault, which judges that S150 and second level under-voltage fault judge: judgement is most
Whether low monomer voltage is less than third preset voltage value in third preset time, and it is pre- that the third preset voltage value is greater than first
If voltage value, less than the second preset voltage value；
Electric current is reduced if so then execute electric current S181:BMS is reduced, when current reduction to pre-set current value, cutting electric discharge；
If it is not, then executing second level under-voltage fault judges S160.
After level-one under-voltage fault judges, the judgement of three-level under-voltage fault is carried out, judges minimum monomer voltage Vmin in third
Whether it is less than third preset voltage value V3 in preset time t 3, as Vmin≤V3, t starts timing, the Vmin in timing course
When > V3, t sets 0；As t > t3, the under-voltage three-level under-voltage fault of monomer is set, BMS carries out drop current practice at this time, and in electric current
When less than pre-set current value, block system relay is prevented under the operating condition of high current, and relay, which is directly cut off, causes the viscous of relay
Even；And in the case where not being particularly urgent, i.e., three-level under-voltage fault when, electric current block system relay again actively drops, only especially
In the case where urgent, i.e. level-one under-voltage fault just direct block system relay.Wherein, in order to judge more rapidly, described first is default
Time is greater than third preset time, and the third preset time is greater than the second preset time.
Fig. 3-6 is please referred to, in another embodiment, a kind of power battery monomer undervoltage protection system, including BMS310
And VCU320；
The BMS310 includes signal acquisition module 311, power computation module 313313 and fault diagnosis module 312；
The signal acquisition module 311 for acquiring the monomer voltage of power battery in real time；
The fault diagnosis module 312 is also used to calculate minimum monomer voltage according to the monomer voltage acquired in real time, according to
The minimum monomer obtains the under-voltage grade of monomer, and the under-voltage grade of monomer includes level-one under-voltage fault and second level under-voltage fault,
The level-one under-voltage fault be minimum monomer voltage in the first preset time less than the first preset voltage value, the second level is under-voltage
Failure be minimum monomer voltage in the second preset time less than the second preset voltage value, when the under-voltage grade of monomer is that level-one is under-voltage
When failure, then according to the operating mode of BMS, the charge and discharge of single battery are cut off, when the under-voltage grade of monomer is second level under-voltage fault
When, then charge-discharge electric power will be reduced to the presupposition multiple of original charge-discharge electric power, and the charge-discharge electric power after reduction is sent
To VCU320；
The power computation module 313313 is used to calculate corresponding charge-discharge electric power according to minimum monomer voltage, will calculate
Charge-discharge electric power be sent to VCU320；
The VCU320 is used to carry out charge and discharge control to motor according to the charge-discharge electric power received.
The monomer voltage of the acquisition power battery in real time of signal acquisition module 311, wherein monomer voltage collection period is
100ms；Minimum monomer voltage Vmin is calculated according to collected monomer voltage in fault diagnosis module 312, wherein power meter
Corresponding charge-discharge electric power can be calculated, and should according to calculated minimum monomer voltage Vmin by calculating module 313313
Charge-discharge electric power is sent to VCU320 by CAN, and VCU320 is automatically controlled to motor progress charge and discharge according to the charge-discharge electric power received
System, the specific operating mode for requesting BMS310 according to the operating condition of the charge-discharge electric power and vehicle received such as VCU320, and it is right
The request of MCU330 transmission torque and revolving speed；Turn MCU330 according to torque and revolving speed the request control motor received
Speed；Wherein, fault diagnosis module 312 judges to obtain monomer according to the minimum monomer voltage Vmin progress under-voltage fault being calculated
Under-voltage grade；First carry out the judgement of level-one under-voltage fault, judge minimum monomer voltage Vmin in the first preset time t 1 whether
Less than the first preset voltage value V1, i.e., as Vmin≤V1, t starts timing, and during timing, when Vmin > V1, then t is set
0, and work as t > t1, then setting power battery there is level-one under-voltage fault, i.e. most serious monomer failure, then BMS310 is that safety is examined
Consider, by direct block system relay, cuts off the charge and discharge of power battery, i.e., improper minimum monomer voltage Vmin is in the first preset time
Less than the first preset voltage value V1 in t1, when BMS310 is in charge mode, disconnection charge relay terminates charging, when
BMS310 disconnects main positive relay in discharge mode, terminates electric discharge, and battery cell voltage under-voltage protection also considers the work of charging
Condition does not allow to discharge while also not allowing to charge, prevent from causing battery irreversible electrification in the case where monomer is especially low
Learn the destruction of level；And work as minimum monomer voltage Vmin > V1, then second level under-voltage fault judgement is carried out, judges minimum monomer voltage
Whether less than the second preset voltage value V2 in the second preset time t 2, i.e., as Vmin≤V2, t starts timing to Vmin, is counting
When during, when Vmin > V2, then t sets 0, and works as t > t2, then set power battery and second level under-voltage fault occur, and at this point,
Although monomer voltage is smaller, also allows to put more electricity, then charge-discharge electric power is reduced, charge-discharge electric power is reduced
For the half of original charge-discharge electric power, i.e., charge-discharge electric power is reduced to the corresponding charge-discharge electric power of minimum monomer voltage Vmin
Half, allow power battery to carry out putting more electricity, and the monomer voltage for reminding user current is lower, prevent electronic vapour
Vehicle is shut down；And in addition to judging minimum monomer voltage, by coming together to judge in conjunction with the persistent anomaly time, avoid
Because the acquisition of monomer voltage receives the interference of periphery electromagnetic field, the erroneous judgement of paired fault is made.
Wherein, in order to obtain accurate charge-discharge electric power, the signal acquisition module 311 is also used to acquire power electric
The monomer temperature value in pond；The power computation module 313313 is used for according to the minimum monomer voltage and monomer temperature value, right
SOP table is searched to obtain corresponding charge-discharge electric power, and the charge-discharge electric power found is sent to VCU320.Signal acquisition module
311 pass through the monomer temperature value of acquisition power battery, wherein the period of monomer temperature value acquisition is 1S；Power computation module
313313 according to minimum monomer voltage and monomer temperature value, searches SOP table to obtain corresponding charge-discharge electric power, available standard
True charge-discharge electric power allows VCU320 to carry out optimal control charge and discharge to motor according to accurate charge-discharge electric power.
In the present embodiment, power battery is likely to occur since gathering line loosening occurs in electric core aging or voltage acquisition is different
Normal situation needs to screen the monomer pressure difference of power battery, and the fault diagnosis module 312 is also used to according to the list
Bulk voltage calculates highest monomer voltage, calculates the voltage difference of highest monomer voltage and minimum monomer voltage, judges the electricity
Whether pressure pressure difference is greater than threshold pressure differential, and if so then execute pressure difference analysis: analysis is monomer voltage acquisition abnormity or electric core aging,
And analysis result is reported and stored.Fault diagnosis module 312 calculates highest monomer voltage according to collected monomer voltage
And minimum monomer voltage, the voltage difference between highest monomer voltage and minimum monomer voltage is then calculated, judgement calculates
Voltage difference whether be greater than the threshold pressure differential of setting, when voltage difference is greater than threshold pressure differential, then monomer pressure difference is carried out extremely
The problem of failure cause judgement, analysis is acquisition abnormity or electric core aging, and analysis result is reported and stored, allow to
Corresponding troubleshooting is carried out for monomer pressure difference failure.The failure mode for distinguishing monomer pressure difference is increased, it is more fixed
The reason of position failure, preferably investigation problem and protection battery.
Referring to Fig. 7, in the present embodiment, and may cause relay adhesion, the list in high current block system relay
Grade that body is under-voltage further includes three-level under-voltage fault, and the three-level under-voltage fault is that minimum monomer voltage is small in third preset time
In third preset voltage value；The fault diagnosis module 312 is also used to when the under-voltage grade of monomer be three-level under-voltage fault, then reduces
Electric current, when current reduction to pre-set current value, cutting electric discharge.After level-one under-voltage fault judges, three-level under-voltage fault is carried out
Judgement, judge minimum monomer voltage Vmin in third preset time t 3 whether be less than third preset voltage value V3, when Vmin≤
When V3, t starts timing, and in timing course when Vmin > V3, t sets 0；As t > t3, event that the setting under-voltage three-level of monomer is under-voltage
Barrier, BMS carries out drop current practice at this time, and when electric current is less than pre-set current value, block system relay prevents the work in high current
Under condition, relay directly cuts off the adhesion for causing relay；And in the case where not being particularly urgent, i.e. three-level under-voltage fault
When, electric current block system relay again actively drops, and only in the case where particularly urgent, i.e., level-one under-voltage fault just directly cuts off relay
Device.Wherein, in order to judge more rapidly, first preset time is greater than third preset time, and the third preset time is greater than
Second preset time.
It should be noted that being not intended to limit although the various embodiments described above have been described herein
Scope of patent protection of the invention.Therefore, it based on innovative idea of the invention, change that embodiment described herein is carried out and is repaired
Change, or using equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it directly or indirectly will be with
Upper technical solution is used in other related technical areas, is included within scope of patent protection of the invention.
Claims (10)
1. a kind of power battery monomer low-voltage protection method, which comprises the following steps:
Signal acquisition: BMS acquires the monomer voltage of power battery in real time；
Voltage calculates: and minimum monomer voltage is calculated according to the monomer voltage；
Power calculation: BMS calculates corresponding charge-discharge electric power according to minimum monomer voltage, and the charge-discharge electric power of calculating is sent to
VCU；
Charge and discharge control: VCU carries out charge and discharge control to motor according to the charge-discharge electric power received；
The judgement of level-one under-voltage fault: whether BMS judges minimum monomer voltage in the first preset time less than the first predeterminated voltage
Value；
It is electrically cut off if so then execute charge and discharge: according to the operating mode of BMS, cutting off the charge and discharge of single battery；
If it is not, then executing the judgement of second level under-voltage fault: whether BMS judges minimum monomer voltage in the second preset time less than the
Two preset voltage values, second preset voltage value are greater than first preset voltage value；
If so, executing reduces power: charge-discharge electric power is reduced to the presupposition multiple of original charge-discharge electric power by BMS, and will drop
Charge-discharge electric power after low is sent to VCU；
If it is not, being then back to charge and discharge control.
2. power battery monomer low-voltage protection method according to claim 1, which is characterized in that the voltage calculating is also wrapped
It includes: highest monomer voltage is calculated according to the monomer voltage；
Further include pressure difference screening before the first under-voltage judgement: calculating the voltage pressure of highest monomer voltage and minimum monomer voltage
Difference, judges whether the voltage difference is greater than threshold pressure differential；
If so then execute pressure difference analysis: analysis is monomer voltage acquisition abnormity or electric core aging, and will analysis result report and
Storage；
If otherwise executing the judgement of level-one under-voltage fault.
3. power battery monomer low-voltage protection method according to claim 1, which is characterized in that the level-one under-voltage fault is sentenced
Further include the judgement of three-level under-voltage fault between the judgement of disconnected and second level under-voltage fault:
Judge whether minimum monomer voltage is less than third preset voltage value, the third preset voltage value in third preset time
Greater than the first preset voltage value, less than the second preset voltage value；
If so then execute reduction electric current: BMS reduces electric current, when current reduction to pre-set current value, cutting electric discharge；
If it is not, then executing the judgement of second level under-voltage fault.
4. power battery monomer low-voltage protection method according to claim 3, which is characterized in that first preset time is small
In third preset time, the third preset time is less than the second preset time.
5. power battery monomer low-voltage protection method according to claim 1, which is characterized in that the signal acquisition is also wrapped
It includes: acquiring the monomer temperature value of power battery；
The power calculation specifically includes: according to the minimum monomer voltage and monomer temperature value, searching SOP table and is corresponded to
Charge-discharge electric power, and the charge-discharge electric power found is sent to VCU.
6. a kind of power battery monomer undervoltage protection system, which is characterized in that including BMS and VCU；
The BMS includes signal acquisition module, power computation module and fault diagnosis module；
The signal acquisition module for acquiring the monomer voltage of power battery in real time；
The fault diagnosis module is also used to calculate minimum monomer voltage according to the monomer voltage acquired in real time, according to described minimum
Monomer obtains the under-voltage grade of monomer, and the under-voltage grade of monomer includes level-one under-voltage fault and second level under-voltage fault, the level-one
Under-voltage fault be minimum monomer voltage in the first preset time less than the first preset voltage value, the second level under-voltage fault is most
Low monomer voltage in the second preset time less than the second preset voltage value, when the under-voltage grade of monomer is level-one under-voltage fault,
Then according to the operating mode of BMS, the charge and discharge of single battery are cut off, when the under-voltage grade of monomer is second level under-voltage fault, then will
Charge-discharge electric power is reduced to the presupposition multiple of original charge-discharge electric power, and the charge-discharge electric power after reduction is sent to VCU；
The power computation module is used to calculate corresponding charge-discharge electric power according to minimum monomer voltage, by the charge and discharge electric work of calculating
Rate is sent to VCU；
The VCU is used to carry out charge and discharge control to motor according to the charge-discharge electric power received.
7. power battery monomer undervoltage protection system according to claim 6, which is characterized in that the fault diagnosis module is also
For calculating highest monomer voltage according to the monomer voltage, the voltage pressure of highest monomer voltage and minimum monomer voltage is calculated
Difference, judges whether the voltage difference is greater than threshold pressure differential, and if so then execute pressure difference analysis: analysis is monomer voltage acquisition abnormity
Or electric core aging, and analysis result is reported and stored.
8. power battery monomer undervoltage protection system according to claim 6, which is characterized in that the under-voltage grade of monomer is also
Including second level under-voltage fault, the second level under-voltage fault is that minimum monomer voltage is less than the default electricity of third in third preset time
Pressure value；
The fault diagnosis module is also used to when the under-voltage grade of monomer be second level under-voltage fault, then reduces electric current, work as current reduction
When to pre-set current value, cutting electric discharge.
9. power battery monomer undervoltage protection system according to claim 8, which is characterized in that first preset time is small
In third preset time, the third preset time is less than the second preset time.
10. power battery monomer undervoltage protection system according to claim 6, which is characterized in that the signal acquisition module
It is also used to acquire the monomer temperature value of power battery；
The power computation module is used to search SOP table according to the minimum monomer voltage and monomer temperature value and be corresponded to
Charge-discharge electric power, and the charge-discharge electric power found is sent to VCU.
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