CN106143159B - The electric vehicle low-voltage power supply system and its control method adjusted with battery equilibrium - Google Patents
The electric vehicle low-voltage power supply system and its control method adjusted with battery equilibrium Download PDFInfo
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- CN106143159B CN106143159B CN201610547052.XA CN201610547052A CN106143159B CN 106143159 B CN106143159 B CN 106143159B CN 201610547052 A CN201610547052 A CN 201610547052A CN 106143159 B CN106143159 B CN 106143159B
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000012360 testing method Methods 0.000 claims abstract description 37
- 238000011156 evaluation Methods 0.000 claims abstract description 28
- 239000000178 monomer Substances 0.000 claims description 64
- 230000005611 electricity Effects 0.000 claims description 58
- 238000001514 detection method Methods 0.000 claims description 25
- 238000005070 sampling Methods 0.000 claims description 11
- 238000012423 maintenance Methods 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 3
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Classifications
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- 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
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- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses the electric vehicle low-voltage power supply systems and its control method adjusted with battery equilibrium.Be related to electric vehicle electric power system technical field, which there is electric vehicle to supply power with double circuit system, battery can be safeguarded, self-test, evaluation.Including battery, No.1 switch, No. two switches, power management module, low-voltage load, No.1 node, No. two nodes, No. three nodes, key switch module, full-vehicle control module and No. three switches；The positive terminal of one end, No. two one end switched and battery that the No.1 switchs is connected on No.1 node；The other end of No. two switches, No. three other end, the power interface positive terminal of power management module and the power interface positive terminals of low-voltage load switched are both connected on No. two nodes；The negative pole end of the battery, the power interface negative pole end of power management module, the power interface negative pole end of low-voltage load and full-vehicle control module power interface negative pole end be both connected on No. three nodes.
Description
Technical field
The present invention relates to electric vehicle electric power system technical fields, and in particular to has the electric vehicle that battery equilibrium is adjusted
Low-voltage power supply system and its control method.
Background technology
New-energy automobile is using more and more extensive currently on the market, it has also become the main direction of development of automobile industry, it is electronic
Automotive safety is increasingly taken seriously.Currently the majority new-energy automobile, after key signal is turned off, as dynamic power system core
The power management module of the heart also just without power supply, can not after key signal is turned off power management module carry out once safety and
Thoroughly evaluating in terms of reliability, safety when also can not just make warning information prompting and ensure operation next time.
Invention content
The present invention is that there are above-mentioned deficiencies in order to solve existing electric vehicle electric power system, is provided a kind of with electric vehicle
Supply power with double circuit system, and power management module continues have electricity in setting time after can guarantee parking, battery can be safeguarded, certainly
Inspection, evaluation, it is ensured that safety during operation electric vehicle next time eliminates insecurity in advance, allows capacity difference between each monomer
Electric vehicle low-voltage power supply system and its control with battery equilibrium adjusting being maintained in the range of preset capacity difference
Method processed.
More than technical problem is solved by following technical proposal：
With the electric vehicle low-voltage power supply system that battery equilibrium is adjusted, including battery, No.1 switch, No. two switches, electricity
Source control module, low-voltage load, No.1 node, No. two nodes, No. three nodes, key switch module, full-vehicle control module, No. three
Switch, voltage sample module and electricity shift module, the power management module include voltage difference balance module and capacity difference
It is worth balance module, the battery includes several monomers；The voltage acquisition end of each monomer is connect respectively with voltage sample module,
The electricity transfer end of each monomer is connect respectively with electricity shift module, power management module respectively with voltage sample module and electricity
Measure shift module connection；The positive terminal of one end, No. two one end switched and battery that the No.1 switchs is connected to No.1 node
On；The other end of the No.1 switch and the power interface positive terminal of full-vehicle control module are connected on one end of No. three switches；
The other end of No. two switches, No. three other end, the power interface positive terminal of power management module and the electricity of low-voltage load switched
Source interface positive terminal is both connected on No. two nodes；The negative pole end of the battery, the power interface negative pole end of power management module,
The power interface negative pole end of low-voltage load and the power interface negative pole end of full-vehicle control module are both connected on No. three nodes；It is described
The control terminal of No.1 switch and the control terminal of No. three switches are all connect with key switch module respectively；The key switch mould
Block is connect with full-vehicle control module；The full-vehicle control module is connect with power management module；The control terminal of No. two switches
It is connect with power management module.
There is this programme electric vehicle to supply power with double circuit system, can guarantee after parking power management module in setting time after
Continuous have electricity, battery can be safeguarded, self-test, evaluation, it is ensured that safety during electric vehicle operation next time is eliminated dangerous in advance
Factor, the capacity difference allowed between each monomer are maintained in the range of preset capacity difference, play the role of safety guarantee.
Preferably, a kind of control method for the electric vehicle low-voltage power supply system for being suitable for adjusting with battery equilibrium,
Include electric process and battery under high pressure power up, low pressure with the control method of low-voltage power supply system that battery equilibrium is adjusted to put down
Weigh adjusting process；If No.1 switchs and the battery powered circuit at No. three switch places is No.1 current supply circuit, if No. two switch institutes
It is No. two current supply circuits in battery powered circuit；
The high pressure power up is：Key switch module switchs the signal of a closure to No.1, while key is opened
Module is closed also to the signal of one closure of No. three switches, and No.1 switch and No. three switches are all closed immediately, when No.1 switch and three
After number switch is all closed, the conducting of No.1 current supply circuit, power management module and low-voltage load are only supplied at this time by No.1 current supply circuit
Electricity；Then power management module is initialized immediately, and carries out self-test after initialization；Then power management module allows No. two
Switch is closed, and No. two current supply circuits is allowed to be connected, and power management module and low-voltage load are supplied at this time by No.1 current supply circuit and No. two
Electrical circuit is powered jointly, and high pressure power up terminates；
Electric process is under the low pressure：Key switch module switchs the signal of a disconnection to No.1, while key is opened
Module is closed also to the signal of one disconnection of No. three switches, and No.1 switch and No. three switches all disconnect immediately, when No.1 switch and three
After number switch all disconnects, No.1 current supply circuit disconnects, and power management module and low-voltage load are only supplied at this time by No. two current supply circuits
Electricity, then power management module safeguards battery, self-test, evaluation and data record preserve, power supply after data record has been protected
Management module controls No. two switches to disconnect, and No. two current supply circuits disconnect immediately, two confessions of power management module and low-voltage load
Electrical circuit all disconnects, and electric process terminates under low pressure.
The battery equilibrium adjusts process：In the time range of setting, voltage sample mould is given by power management module
Block sends out work order, and voltage sample module carries out voltage signal sampling, and collected to each monomer of battery immediately
Voltage sampling signal is uploaded to power management module；Then the voltage sampling signal received is sent into voltage difference by power management module
The voltage difference between current each monomer is obtained after voltage difference calculating is carried out in value balance module, if between current each monomer
Voltage difference then terminate battery equilibrium adjusting except preset voltage difference range, if between current each monomer
The voltage sampling signal received is then sent by voltage difference within preset voltage difference range by power management module
The capacity difference between current each monomer is obtained after capacity difference calculating is carried out in capacity difference balance module, if current each
Capacity difference between monomer is more than preset capacity difference, then is instructed by power management module to electricity shift module, electricity
A part of electricity in the big monomer of capacity is transferred in the small monomer of capacity by amount shift module immediately to be gone until each monomer
Between capacity difference in the range of preset capacity difference, so far, one-shot battery balance adjustment process terminates, and so on
The capacity difference that can be allowed between each monomer is maintained in the range of preset capacity difference.
There is this programme electric vehicle to supply power with double circuit system, can guarantee after parking power management module in setting time after
Continuous have electricity, battery can be safeguarded, self-test, evaluation, it is ensured that safety during electric vehicle operation next time is eliminated dangerous in advance
Factor, the capacity difference allowed between each monomer are maintained in the range of preset capacity difference, play the role of safety guarantee.
Preferably, containing the benchmark OCV curves of battery in power management module memory, and record benchmark OCV curves
Benchmark pressure difference；
After key is pulled out in electric vehicle parking, power management module then is continued to power by No. two current supply circuit power supplies；Work as electricity
Source control module then judges that electric vehicle is in dead ship condition after the signal that can't detect full-vehicle control module；
Then power management module safeguards battery, and battery standing h, Ran Hou electricity for a period of time are kept after the completion of safeguarding
Source control module detects the parking OCV curves of battery；And record the parking pressure difference of parking OCV curves；
Parking pressure difference with benchmark pressure difference is compared, if parking pressure difference >=benchmark pressure difference, it is abnormal to judge that battery occurs,
And send out corresponding alarm；
The power management module detects entire battery when powering on next time, but before electric vehicle is also not actuated
Start the switch DP of OCV curves, and compared with switch DP and benchmark pressure difference, if switch DP >=benchmark pressure difference, sentences
It powers off pond and exception occurs, and send out corresponding alarm.
Preferably, further include self-test, evaluation, maintenance process and the electricity completion under parking of battery after electric vehicle parking
After allow electric vehicle parking a period of time, self-test before electric automobile high-voltage is powered on when electric vehicle is again started up was evaluated
Journey；
(1), the self-test of battery, evaluation, maintenance process are as follows after electric vehicle parking：
It is kept off to OOF and kept off by ON when key switch module, full-vehicle control module and power management module detect flame-out instruction；
Power management module judges high pressure, and full-vehicle control module controls No.1 switch and No. three by key switch module
Switch all disconnects；And power management module then continues No. two switches of control and is closed；
Power management module detects battery temperature T, and power management module also detects the monomer voltage of battery simultaneously；
According to application demand sets itself reference temperature value T0If T >=T0, by power management module control low-voltage load
Cooling mechanism radiates to battery；And detection battery temperature T in real time；
According to the benchmark monomer pressure difference V of application demand sets itself battery0If monomer pressure difference △ V >=V of battery0, by electricity
Source control module carries out battery voltage that is balanced, and detecting monomer in real time；
According to application demand, sets itself temperature value T1＜ T0, power management module detection battery temperature, as T ＜ T1When,
Power management module control cooling mechanism stops heat dissipation；Power management module detects monomer voltage maximum differential pressure, as △ V ＜ V0,
Stop balanced；
Power management module records the time of repose h of battery, according to application demand sets itself benchmark time of repose h1, when
During time of repose h >=h1,
Battery is moved by power management module and carries out SOC value correction, records the correlation of OCV curves, internal resistance, insulation resistance value
It can parameter；
Data are all kept records of by power management module；
Power management module controls No. two switches to disconnect, and No. two current supply circuits power off immediately；
So far, the self-test of battery, evaluation, maintenance process terminate after electric vehicle parking；
(2), after the completion of electricity under parking, electric vehicle parking a period of time, when electric vehicle is again started up, electricity are allowed
Electrical automobile high pressure power on before self-test, evaluation procedure it is as follows：
When key switch to ON is kept off, full-vehicle control module and power management module detect enabled instruction；
Full-vehicle control module control No.1 switch is closed, the conducting of No.1 current supply circuit；
Power management module initializes and self-test controls No. two switches to be closed：No. two current supply circuit conductings；
Power management module records the correlation performance parameters of OCV curves, internal resistance, insulation resistance value；
Data and original stored data before power management module comparison high voltage startup；And comparison parking when and high voltage startup
Preceding voltage data,
(parking pressure difference-switch DP) ÷ down times >=setting voltage then judge that the internal resistance of battery is abnormal, and send out pair
Answer alarm；
Power management module is alarmed to full-vehicle control module, ensures the status safety before electric vehicle each run；
High pressure is completed if all going well to power on；
So far, after the completion of electricity under parking, electric vehicle parking a period of time, when electric vehicle is again started up, electricity are allowed
Electrical automobile high pressure power on before self-test, evaluation procedure terminates.
Preferably, power management module includes comparison circuit and current threshold comparator, and exported using comparison circuit
High level signal trigger the startup of self-test, whether the load current that low-voltage load is detected by current threshold comparator reaches
The threshold value of threshold judges high level signal that whether comparison circuit exports；
The current detection threshold of current threshold comparator is set by the threshold register of the current threshold comparator, if electric
The current detection threshold ranging from H1-H2 of threshold comparator is flowed, presetting standard source output needs the electric signal detected, and set
The bottom threshold of the current detection threshold range of current threshold comparator is H1, if the current detection threshold of current threshold comparator
The upper threshold of range is H2, if it is variable H to fall the value limited under the threshold value between H1 and upper threshold H2；It and will be under threshold value
Limit H1, upper threshold H2 and variable H are stored in threshold register together；
When comparison circuit exports high level, judge whether (H2-H) ÷ (H-H1) is more than 1, if (H2-H) ÷ (H-H1)
It more than 1, then detects current threshold and is equal to H, then terminate calibration detection；(if H2-H) ÷ (H-H1) no more than 1, allows H1
=H, and new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register；
When comparison circuit exports low level, judge whether (H-H1) ÷ (H2-H) is more than 1, if (H-H1) ÷ (H2-H)
It more than 1, then detects current threshold and is equal to H1, then terminate calibration detection；(if H-H1) ÷ (H2-H) allows no more than 1
H2=H, and new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register；
Then the low and high level signal for comparison circuit being controlled to export by variable H values new in threshold register.
The present invention can reach following effect：
There is the present invention electric vehicle to supply power with double circuit system, can guarantee after parking power management module in setting time after
Continuous have electricity, battery can be safeguarded, self-test, evaluation, it is ensured that safety during electric vehicle operation next time is eliminated dangerous in advance
Factor, the capacity difference allowed between each monomer are maintained in the range of preset capacity difference, play the role of safety guarantee.
Description of the drawings
Fig. 1 is a kind of schematic diagram of circuit principle connecting structure of the present invention.
Fig. 2 be the self-test of battery after electric vehicle of the present invention stops, evaluation, maintenance process a kind of flow diagram.
Fig. 3 after the completion of electricity under parking, allows electric vehicle parking a period of time, when electric vehicle is again started up to be of the invention
When, electric automobile high-voltage power on before self-test, evaluation procedure a kind of flow diagram.
Fig. 4 is a kind of flow diagram present invention determine that the high level signal whether comparison circuit exports.
Specific embodiment
The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings.
Embodiment, have battery equilibrium adjust electric vehicle low-voltage power supply system, it is shown in Figure 1, including battery 1,
No.1 switchs 2, No. two switches 3, power management module 4, low-voltage load 5, No.1 node 6, two node 7, three node 8, keys
Spoon switch module 9,10, No. three switches 11 of full-vehicle control module, voltage sample module 16 and electricity shift module 17, the power supply
Management module includes voltage difference balance module 18 and capacity difference balance module 19, and the battery includes several monomers；Often
The voltage acquisition end of a monomer is connect respectively with voltage sample module, and mould is shifted in the electricity transfer end of each monomer with electricity respectively
Block connects, and power management module is connect respectively with voltage sample module and electricity shift module.
The monomer of the present embodiment shares 4, respectively monomer 12, monomer 13, monomer 14 and monomer 15.
The positive terminal of one end, No. two one end switched and battery that the No.1 switchs is connected on No.1 node；
The other end of the No.1 switch and the power interface positive terminal of full-vehicle control module are connected to the one of No. three switches
On end；
No. two switch the other ends, No. three switch the other ends, power management module power interface positive terminal and low pressure
The power interface positive terminal of load is both connected on No. two nodes；
The negative pole end of the battery, the power interface negative pole end of power management module, low-voltage load power interface cathode
The power interface negative pole end of end and full-vehicle control module is both connected on No. three nodes；The control terminal of No.1 switch and described
The control terminal of No. three switches is all connect with key switch module respectively；The key switch module is connect with full-vehicle control module；
The full-vehicle control module is connect with power management module；The control terminal of No. two switches is connect with power management module.
The battery is the rechargeable battery using peak-trough electricity charging, to electricity if current time is in paddy electricity chargeable time
It charges in pond；
If current time is in except paddy electricity chargeable time, power management module is to one basic power threshold of battery assignment
W, power management module read the charge value A of current time, paddy electricity chargeable time opening time and present battery, power management mould
Block calculates current time and the difference of paddy electricity chargeable time opening time obtains time difference T；
Power management module calculates Am1+Tm2, m1And m2For the weighting coefficient of setting, work as Am1+Tm2>=W is then judged to being not required to
It to charge to battery, whenThen it is judged to needing to charge to battery.
Include electric process under high pressure power up, low pressure with the control method of low-voltage power supply system that battery equilibrium is adjusted
Process is adjusted with battery equilibrium；If No.1 switchs and the battery powered circuit at No. three switch places is No.1 current supply circuit, if two
Number battery powered circuit where switch is No. two current supply circuits；
The high pressure power up is：Key switch module switchs the signal of a closure to No.1, while key is opened
Module is closed also to the signal of one closure of No. three switches, and No.1 switch and No. three switches are all closed immediately, when No.1 switch and three
After number switch is all closed, the conducting of No.1 current supply circuit, power management module and low-voltage load are only supplied at this time by No.1 current supply circuit
Electricity；Then power management module is initialized immediately, and carries out self-test after initialization；Then power management module allows No. two
Switch is closed, and No. two current supply circuits is allowed to be connected, and power management module and low-voltage load are supplied at this time by No.1 current supply circuit and No. two
Electrical circuit is powered jointly, and high pressure power up terminates；
Electric process is under the low pressure：Key switch module switchs the signal of a disconnection to No.1, while key is opened
Module is closed also to the signal of one disconnection of No. three switches, and No.1 switch and No. three switches all disconnect immediately, when No.1 switch and three
After number switch all disconnects, No.1 current supply circuit disconnects, and power management module and low-voltage load are only supplied at this time by No. two current supply circuits
Electricity, then power management module safeguards battery, self-test, evaluation and data record preserve, power supply after data record has been protected
Management module controls No. two switches to disconnect, and No. two current supply circuits disconnect immediately, two confessions of power management module and low-voltage load
Electrical circuit all disconnects, and electric process terminates under low pressure.
The battery equilibrium adjusts process：In the time range of setting, voltage sample mould is given by power management module
Block sends out work order, and voltage sample module carries out voltage signal sampling, and collected to each monomer of battery immediately
Voltage sampling signal is uploaded to power management module；Then the voltage sampling signal received is sent into voltage difference by power management module
The voltage difference between current each monomer is obtained after voltage difference calculating is carried out in value balance module, if between current each monomer
Voltage difference then terminate battery equilibrium adjusting except preset voltage difference range, if between current each monomer
The voltage sampling signal received is then sent by voltage difference within preset voltage difference range by power management module
The capacity difference between current each monomer is obtained after capacity difference calculating is carried out in capacity difference balance module, if current each
Capacity difference between monomer is more than preset capacity difference, then is instructed by power management module to electricity shift module, electricity
A part of electricity in the big monomer of capacity is transferred in the small monomer of capacity by amount shift module immediately to be gone until each monomer
Between capacity difference in the range of preset capacity difference, so far, one-shot battery balance adjustment process terminates, and so on
The capacity difference that can be allowed between each monomer is maintained in the range of preset capacity difference.
The benchmark OCV curves of battery are contained, and record the benchmark pressure difference of benchmark OCV curves in power management module memory；
After key is pulled out in electric vehicle parking, power management module then is continued to power by No. two current supply circuit power supplies；Work as electricity
Source control module then judges that electric vehicle is in dead ship condition after the signal that can't detect full-vehicle control module；
Then power management module safeguards battery, and battery standing h, Ran Hou electricity for a period of time are kept after the completion of safeguarding
Source control module detects the parking OCV curves of battery；And record the parking pressure difference of parking OCV curves；
Parking pressure difference with benchmark pressure difference is compared, if parking pressure difference >=benchmark pressure difference, it is abnormal to judge that battery occurs,
And send out corresponding alarm；
The power management module detects entire battery when powering on next time, but before electric vehicle is also not actuated
Start the switch DP of OCV curves, and compared with switch DP and benchmark pressure difference, if switch DP >=benchmark pressure difference, sentences
It powers off pond and exception occurs, and send out corresponding alarm.
It further includes the self-test of battery after electric vehicle parking, evaluation, maintenance process and is allowed after the completion of electricity under parking electronic
Parking of automobile for a period of time, self-test, evaluation procedure before electric automobile high-voltage is powered on when electric vehicle is again started up；
Shown in Figure 2, the self-test of battery, evaluation, maintenance process are as follows after the parking of (one), electric vehicle：
It is kept off to OOF and kept off by ON when key switch module, full-vehicle control module and power management module detect flame-out instruction；
Power management module judges high pressure, and full-vehicle control module controls No.1 switch and No. three by key switch module
Switch all disconnects；And power management module then continues No. two switches of control and is closed；
Power management module detects battery temperature T, and power management module also detects the monomer voltage of battery simultaneously；
According to application demand sets itself reference temperature value T0If T >=T0, by power management module control low-voltage load
Cooling mechanism radiates to battery；And detection battery temperature T in real time；
According to the benchmark monomer pressure difference V of application demand sets itself battery0If monomer pressure difference △ V >=V of battery0, by electricity
Source control module carries out battery voltage that is balanced, and detecting monomer in real time；
According to application demand, sets itself temperature value T1＜ T0, power management module detection battery temperature, as T ＜ T1When,
Power management module control cooling mechanism stops heat dissipation；Power management module detects monomer voltage maximum differential pressure, as △ V ＜ V0,
Stop balanced；
Power management module records the time of repose h of battery, according to application demand sets itself benchmark time of repose h1, when
During time of repose h >=h1,
Battery is moved by power management module and carries out SOC value correction, records the correlation of OCV curves, internal resistance, insulation resistance value
It can parameter；
Data are all kept records of by power management module；
Power management module controls No. two switches to disconnect, and No. two current supply circuits power off immediately；
So far, the self-test of battery, evaluation, maintenance process terminate after electric vehicle parking；
It is shown in Figure 3, (two), after the completion of electricity under parking, allow electric vehicle parking a period of time, when electric vehicle again
During secondary startup, electric automobile high-voltage power on before self-test, evaluation procedure it is as follows：
When key switch to ON is kept off, full-vehicle control module and power management module detect enabled instruction；
Full-vehicle control module control No.1 switch is closed, the conducting of No.1 current supply circuit；
Power management module initializes and self-test controls No. two switches to be closed：No. two current supply circuit conductings；
Power management module records the correlation performance parameters of OCV curves, internal resistance, insulation resistance value；
Data and original stored data before power management module comparison high voltage startup；And comparison parking when and high voltage startup
Preceding voltage data,
(parking pressure difference-switch DP) ÷ down times >=setting voltage then judge that the internal resistance of battery is abnormal, and send out pair
Answer alarm；
Power management module is alarmed to full-vehicle control module, ensures the status safety before electric vehicle each run；
High pressure is completed if all going well to power on；
So far, after the completion of electricity under parking, electric vehicle parking a period of time, when electric vehicle is again started up, electricity are allowed
Electrical automobile high pressure power on before self-test, evaluation procedure terminates.
Shown in Figure 4, power management module includes comparison circuit and current threshold comparator, and defeated using comparison circuit
The high level signal gone out triggers the startup of self-test, and whether the load current that low-voltage load is detected by current threshold comparator reaches
Judge high level signal that whether comparison circuit exports to the threshold value of threshold；
The current detection threshold of current threshold comparator is set by the threshold register of the current threshold comparator, if electric
The current detection threshold ranging from H1-H2 of threshold comparator is flowed, presetting standard source output needs the electric signal detected, and set
The bottom threshold of the current detection threshold range of current threshold comparator is H1, if the current detection threshold of current threshold comparator
The upper threshold of range is H2, if it is variable H to fall the value limited under the threshold value between H1 and upper threshold H2；It and will be under threshold value
Limit H1, upper threshold H2 and variable H are stored in threshold register together；
When comparison circuit exports high level, judge whether (H2-H) ÷ (H-H1) is more than 1, if (H2-H) ÷ (H-H1)
It more than 1, then detects current threshold and is equal to H, then terminate calibration detection；(if H2-H) ÷ (H-H1) no more than 1, allows H1
=H, and new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register；
When comparison circuit exports low level, judge whether (H-H1) ÷ (H2-H) is more than 1, if (H-H1) ÷ (H2-H)
It more than 1, then detects current threshold and is equal to H1, then terminate calibration detection；(if H-H1) ÷ (H2-H) allows no more than 1
H2=H, and new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register；
Then the low and high level signal for comparison circuit being controlled to export by variable H values new in threshold register.
There is the present embodiment electric vehicle to supply power with double circuit system, and power management module is in setting time after can guarantee parking
Continue have electricity, battery can be safeguarded, self-test, evaluation, it is ensured that safety during operation electric vehicle next time is eliminated uneasy in advance
Total factor, the capacity difference allowed between each monomer are maintained in the range of preset capacity difference, play the role of safety guarantee.
Embodiments of the present invention are described above in conjunction with attached drawing, however, the implementation is not limited to the above embodiments, this field
Those of ordinary skill can be with various changes and modifications may be made within the scope of the appended claims.
Claims (5)
1. the electric vehicle low-voltage power supply system adjusted with battery equilibrium, which is characterized in that switched including battery (1), No.1
(2), No. two switches (3), power management module (4), low-voltage load (5), No.1 node (6), No. two nodes (7), No. three nodes
(8), key switch module (9), full-vehicle control module (10), No. three switches (11), voltage sample module (16) and electricity transfer
Module (17), the power management module includes voltage difference balance module (18) and capacity difference balance module (19), described
Battery includes several monomers；The voltage acquisition end of each monomer is connect respectively with voltage sample module, the electricity of each monomer
Transfer end is connect respectively with electricity shift module, and power management module connects respectively with voltage sample module and electricity shift module
It connects；The positive terminal of one end, No. two one end switched and battery that the No.1 switchs is connected on No.1 node；The No.1 is opened
The other end of pass and the power interface positive terminal of full-vehicle control module are connected on one end of No. three switches；No. two switch it is another
End, No. three switch the other ends, power management module power interface positive terminal and low-voltage load power interface positive terminal it is equal
It is connected on No. two nodes；The negative pole end of the battery, the power interface negative pole end of power management module, low-voltage load power supply
Interface negative pole end and the power interface negative pole end of full-vehicle control module are both connected on No. three nodes；The control of the No.1 switch
The control terminal of end and No. three switches is all connect with key switch module respectively；The key switch module and full-vehicle control mould
Block connects；The full-vehicle control module is connect with power management module；The control terminal and power management module of No. two switches
Connection.
2. a kind of controlling party suitable for the electric vehicle low-voltage power supply system described in claim 1 adjusted with battery equilibrium
Method, which is characterized in that there is the control method of low-voltage power supply system that battery equilibrium is adjusted to include under high pressure power up, low pressure
Electric process and battery equilibrium adjust process；If No.1 switchs and the battery powered circuit at No. three switch places powers back for No.1
Road, if battery powered circuit where No. two switches is No. two current supply circuits；
The high pressure power up is：Key switch module switchs the signal of a closure, while key switch mould to No.1
Also to the signal of one closure of No. three switches, No.1 switch and No. three switches are all closed block immediately, when No.1 switch and No. three are opened
It closes after being all closed, the conducting of No.1 current supply circuit, power management module and low-voltage load are only powered at this time by No.1 current supply circuit；So
Power management module is initialized immediately afterwards, and carries out self-test after initialization；Then power management module allows No. two switches
It is closed, No. two current supply circuits is allowed to be connected, power management module and low-voltage load are powered back at this time by No.1 current supply circuit and No. two
Road powers jointly, and high pressure power up terminates；
Electric process is under the low pressure：Key switch module switchs the signal of a disconnection, while key switch mould to No.1
Also to the signal of one disconnection of No. three switches, No.1 switch and No. three switches all disconnect block immediately, when No.1 switch and No. three are opened
It closes after all disconnecting, No.1 current supply circuit disconnects, and power management module and low-voltage load are only powered at this time by No. two current supply circuits, so
Power management module safeguards battery afterwards, self-test, evaluation and data record preserve, power management mould after data record has been protected
Block controls No. two switches to disconnect, and No. two current supply circuits disconnect immediately, two current supply circuits of power management module and low-voltage load
It all disconnects, electric process terminates under low pressure；
The battery equilibrium adjusts process：In the time range of setting, sent out by power management module to voltage sample module
Go out work order, voltage sample module carries out voltage signal sampling, and collected voltage to each monomer of battery immediately
Sampled signal is uploaded to power management module；Then power management module is equal by the voltage sampling signal received feeding voltage difference
The voltage difference between current each monomer is obtained after voltage difference calculating is carried out in weighing apparatus module,
Terminate battery equilibrium tune if the voltage difference between current each monomer is except preset voltage difference range
Section,
By power management module if the voltage difference between current each monomer is within preset voltage difference range
The voltage sampling signal received is sent into capacity difference balance module after carrying out capacity difference calculating and obtains current each monomer
Between capacity difference, if the capacity difference between current each monomer is more than preset capacity difference, by power management
Module is instructed to electricity shift module, and a part of electricity in the big monomer of capacity is transferred to capacity by electricity shift module immediately
Gone in small monomer until each monomer between capacity difference in the range of preset capacity difference, so far, one-shot battery
Balance adjustment process terminates, and the capacity difference that can and so on allow between each monomer is maintained at preset capacity difference range
It is interior.
3. the control method of the electric vehicle low-voltage power supply system according to claim 2 adjusted with battery equilibrium,
It is characterized in that, the benchmark OCV curves of battery is contained, and record the benchmark pressure difference of benchmark OCV curves in power management module memory；
After key is pulled out in electric vehicle parking, power management module then is continued to power by No. two current supply circuit power supplies；When power supply pipe
Reason module then judges that electric vehicle is in dead ship condition after the signal that can't detect full-vehicle control module；
Then power management module safeguards battery, battery standing h for a period of time is kept after the completion of safeguarding, then power supply pipe
Manage the parking OCV curves of module detection battery；And record the parking pressure difference of parking OCV curves；
Parking pressure difference with benchmark pressure difference is compared, if parking pressure difference >=benchmark pressure difference, it is abnormal to judge that battery occurs, concurrently
Go out corresponding alarm；
The power management module detects the startup of entire battery when powering on next time, but before electric vehicle is also not actuated
The switch DP of OCV curves, and compared with switch DP and benchmark pressure difference, if switch DP >=benchmark pressure difference, judges electricity
There is exception in pond, and sends out corresponding alarm.
4. the control method of the electric vehicle low-voltage power supply system according to claim 2 adjusted with battery equilibrium,
It is characterized in that,
Further include self-test, evaluation, maintenance process and the electric electric vehicle that allows after the completion under parking of battery after electric vehicle stops
Parking a period of time, self-test, evaluation procedure before electric automobile high-voltage is powered on when electric vehicle is again started up；
(1), the self-test of battery, evaluation, maintenance process are as follows after electric vehicle parking：
It is kept off to OOF and kept off by ON when key switch module, full-vehicle control module and power management module detect flame-out instruction；
Power management module judges high pressure, and full-vehicle control module controls No.1 switch and No. three switches by key switch module
All disconnect；And power management module then continues No. two switches of control and is closed；
Power management module detects battery temperature T, and power management module also detects the monomer voltage of battery simultaneously；
According to application demand sets itself reference temperature value T0If T >=T0, by the heat dissipation of power management module control low-voltage load
Mechanism radiates to battery；And detection battery temperature T in real time；
According to the benchmark monomer pressure difference V of application demand sets itself battery0If monomer pressure differential deltap V >=V of battery0, by power supply pipe
It manages module and voltage that is balanced, and detecting monomer in real time is carried out to battery；
According to application demand, sets itself temperature value T1＜ T0, power management module detection battery temperature, as T ＜ T1When, power supply
Management module control cooling mechanism stops heat dissipation；Power management module detects monomer voltage maximum differential pressure, as Δ V ＜ V0, stop
It is balanced；
Power management module records the time of repose h of battery, according to application demand sets itself benchmark time of repose h1, works as standing
During time h >=h1,
Battery is moved by power management module and carries out SOC value correction, records the correlated performance ginseng of OCV curves, internal resistance, insulation resistance value
Number；
Data are all kept records of by power management module；
Power management module controls No. two switches to disconnect, and No. two current supply circuits power off immediately；
So far, the self-test of battery, evaluation, maintenance process terminate after electric vehicle parking；
(2), after the completion of electricity under parking, electric vehicle parking a period of time, when electric vehicle is again started up, electronic vapour are allowed
Overall height pressure power on before self-test, evaluation procedure it is as follows：
When key switch to ON is kept off, full-vehicle control module and power management module detect enabled instruction；
Full-vehicle control module control No.1 switch is closed, the conducting of No.1 current supply circuit；
Power management module initializes and self-test controls No. two switches to be closed：No. two current supply circuit conductings；
Power management module records the correlation performance parameters of OCV curves, internal resistance, insulation resistance value；
Data and original stored data before power management module comparison high voltage startup；And comparison parking when and high voltage startup before electricity
Press data,
(parking pressure difference-switch DP) ÷ down times >=setting voltage then judge that the internal resistance of battery is abnormal, and sends out corresponding report
Alert prompting；
Power management module is alarmed to full-vehicle control module, ensures the status safety before electric vehicle each run；
High pressure is completed if all going well to power on；
So far, after the completion of electricity under parking, electric vehicle parking a period of time, when electric vehicle is again started up, electronic vapour are allowed
Overall height pressure power on before self-test, evaluation procedure terminates.
5. the control method of the electric vehicle low-voltage power supply system according to claim 2 adjusted with battery equilibrium,
It is characterized in that, power management module includes comparison circuit and current threshold comparator, and using the high level of comparison circuit output
Signal triggers the startup of self-test, and whether the load current that low-voltage load is detected by current threshold comparator reaches threshold
Threshold value judge high level signal that whether comparison circuit exports；
The current detection threshold of current threshold comparator is set by the threshold register of the current threshold comparator, if current threshold
It is worth the current detection threshold ranging from H1-H2 of comparator, presetting standard source output needs the electric signal detected, and set electric current
The bottom threshold of the current detection threshold range of threshold comparator is H1, if the current detection threshold range of current threshold comparator
Upper threshold for H2, if it is variable H to fall the value limited under the threshold value between H1 and upper threshold H2；And by bottom threshold
H1, upper threshold H2 and variable H are stored in threshold register together；
When comparison circuit exports high level, judge whether (H2-H) ÷ (H-H1) is more than 1, if (H2-H) ÷ (H-H1) is more than
1, then it detects current threshold and is equal to H, then terminate calibration detection；If (H2-H) ÷ (H-H1) no more than 1, allows H1=H,
And new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register；
When comparison circuit exports low level, judge whether (H-H1) ÷ (H2-H) is more than 1, if (H-H1) ÷ (H2-H) is more than
1, then it detects current threshold and is equal to H1, then terminate calibration detection；(if H-H1) ÷ (H2-H) no more than 1, allows H2=
H, and new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register；
Then the low and high level signal for comparison circuit being controlled to export by variable H values new in threshold register.
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Address after: 313100 Zhejiang city of Huzhou province Changxing County pheasant emerging urban industrial park Patentee after: Chaowei Power Group Co., Ltd Address before: 313100 Zhejiang city of Huzhou province Changxing County pheasant emerging urban industrial park Patentee before: Chilwee Power Supply Co., Ltd. |