CN109466381A - A kind of power supply system - Google Patents
A kind of power supply system Download PDFInfo
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- CN109466381A CN109466381A CN201811622089.XA CN201811622089A CN109466381A CN 109466381 A CN109466381 A CN 109466381A CN 201811622089 A CN201811622089 A CN 201811622089A CN 109466381 A CN109466381 A CN 109466381A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 281
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 281
- 239000000446 fuel Substances 0.000 claims abstract description 127
- 230000005611 electricity Effects 0.000 claims description 13
- 240000002853 Nelumbo nucifera Species 0.000 claims description 3
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims description 3
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims description 3
- 230000009194 climbing Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 10
- 230000007812 deficiency Effects 0.000 description 6
- 238000004064 recycling Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000036755 cellular response Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Classifications
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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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Abstract
This application discloses a kind of power supply systems, comprising: lithium battery, fuel cell, microcontroller, first sensor, second sensor；Lithium battery is connect by first sensor with microcontroller；Microcontroller obtains the state parameter of lithium battery by first sensor；Fuel cell is connect by second sensor with microcontroller；Microcontroller obtains the state parameter of fuel cell by second sensor；Microcontroller is used for, and according to state parameter, controls the input and/or output power of lithium battery and fuel cell.By the embodiment of the present application, can overcome fuel cell system there are course continuation mileages it is low, accelerate climbing capacity insufficient and energy feedback on insufficient disadvantage.
Description
Technical field
This application involves new-energy automobiles for electrical domain more particularly to a kind of power supply system.
Background technique
New-energy automobile refer to using unconventional vehicle fuel as a source of power (or using conventional vehicle fuel,
Using new vehicle-mounted power plant), the dynamic Control of comprehensive vehicle and the advanced technology of driving aspect, the technical principle elder generation of formation
Into, the automobile with new technology, new construction.
Currently, there are fuel cell cars in new-energy automobile, still, by the limit of hydrogen storage energy density and manufacturing cost
System, the operating range of fuel cell car is still than orthodox car much shorter, in addition, there are course continuation mileages for fuel cell system
It is low, accelerate the deficiency on climbing capacity deficiency and energy feedback.
Summary of the invention
This application provides a kind of power supply systems, it is therefore intended that solves fuel electricity caused by the performance deficiency because of fuel cell
The bad problem of pond automotive performance.
To achieve the goals above, this application provides following technical schemes:
This application provides a kind of power supply systems, comprising: lithium battery, fuel cell, microcontroller, first sensor,
Two sensors；
The lithium battery is connect by the first sensor with the microcontroller；The microcontroller passes through described the
One sensor obtains the state parameter of the lithium battery；
The fuel cell is connect by the second sensor with the microcontroller；The microcontroller passes through described
Second sensor obtains the state parameter of the fuel cell；
The microcontroller is used for, and according to the state parameter, controls the input of the lithium battery and the fuel cell
And/or output power.
Preferably, further includes:
The first relay being connected with the motor of vehicle, the microprocessor and the lithium battery；The microprocessor is used
In by controlling first relay, the connection or disconnection of the lithium battery Yu the motor are realized；
The second relay being connected with the microprocessor and the fuel cell；The microprocessor is for passing through control
Second relay realizes the connection or disconnection of the fuel cell Yu the motor.
Preferably, the state parameter of the lithium battery includes: the state-of-charge of the lithium battery；
The state parameter of the fuel cell includes: the peak power output of the fuel cell.
Preferably, the microcontroller is used for, and according to the state parameter, calculates the lithium battery and the fuel cell
Input and/or output power include:
The microcontroller is specifically used for, in the minus situation of the bearing power, the output of the fuel cell
Power is zero；
When the bearing power is less than zero and the state-of-charge of the lithium battery is not up to predetermined upper threshold value, determine
The safe input power of maximum of the lithium battery under the state-of-charge of the lithium battery；By the identified safe input power of maximum
Minimum value between the charge power of motor is the input power of the lithium battery；
It is described when the bearing power is less than zero and the state-of-charge of the lithium battery reaches the predetermined upper threshold value
The input power of lithium battery is zero.
Preferably, the microcontroller is used for, and determines the maximum of the lithium battery described under the state-of-charge of the lithium battery
Safe input power, comprising:
The difference of the upper limit threshold of the state-of-charge of the state-of-charge and lithium battery according to the lithium battery, determines institute
State the maximum safe charging electric current of lithium battery；
According to computation rule is preset, the corresponding maximum safe charging power of the maximum safe charging electric current is determined；
By the minimum value in the factory maximum charge power of the maximum safe charging power and the lithium battery, it is determined as
The safe input power of maximum.
Preferably, the microcontroller is used for, and according to the state parameter, calculates the lithium battery and the fuel cell
Input and/or output power, comprising:
When the bearing power is greater than zero and is greater than the peak power output of the fuel cell, the fuel electricity is determined
The output power in pond is peak power output；
When the bearing power is greater than zero and is greater than the peak power output of the fuel cell, if the lithium battery
Current state-of-charge be lower than predetermined lower threshold value, it is determined that the output power of the lithium battery is zero；
If the current state-of-charge of the lithium battery is higher than the predetermined lower threshold value, working as in the lithium battery is determined
The maximum Safety output power of the lithium battery under preceding state-of-charge is not more than the maximum with the output power of the lithium battery
Safety output power is principle, determines the output power of the lithium battery.
Preferably, the microcontroller is used for, with the output power of the lithium battery no more than the maximum Safety output
Power is principle, determines the output power of the lithium battery, comprising:
In the case where the maximum Safety output power of the lithium battery is not less than the first power, the lithium battery is determined
Output power is maximum first power；First power is the maximum output of the bearing power and the fuel cell
Difference between power；
In the case where the maximum Safety output power of the lithium battery is less than first power, the lithium battery is determined
Output power be zero.
Preferably, the microcontroller is used for, and according to the state parameter, calculates the lithium battery and the fuel cell
Input and/or output power, comprising:
When the bearing power is greater than the peak power output that zero is less than the fuel cell, if the lithium battery
Current state-of-charge is lower than predetermined lower threshold value, it is determined that charges by lithium battery of the second power, until the lithium battery is worked as
Preceding state-of-charge reaches the upper limit threshold；Second power is the maximum discharge power and bearing power difference of fuel cell
Absolute value；The output power of the fuel cell is the peak power output of the fuel cell；
If the current state-of-charge of the lithium battery is greater than the predetermined lower threshold value, it is determined that in the lithium battery
The maximum Safety output power of the lithium battery under current state-of-charge；According to the lithium battery maximum Safety output power and
The output power of the comparison result of bearing power and the lithium battery is principle no more than the maximum Safety output power,
Determine the output power of the lithium battery.
Preferably, the microcontroller is used for, according to the maximum Safety output power of the lithium battery and the ratio of bearing power
Compared with as a result, and the output power of the lithium battery no more than the maximum Safety output power is principle, determine the lithium electricity
The output power in pond, comprising:
The microcontroller is specifically used for, and is not less than the bearing power in the maximum Safety output power of the lithium battery
When, determine that the output power of the lithium battery is the bearing power；It is less than in the maximum Safety output power of the lithium battery
When the bearing power, determine that the output power of the lithium battery is the maximum Safety output power of the lithium battery.
Preferably, the maximum Safety output function of determination lithium battery under the current state-of-charge of the lithium battery
Rate, comprising:
Difference between the lower threshold of the state-of-charge of the current state-of-charge and lithium battery according to the lithium battery,
Determine the maximum safe-discharge electric current of the lithium battery；
According to the maximum safe-discharge electric current, the maximum safe-discharge power of the lithium battery is determined；
By the minimum value in maximum safe-discharge power maximum discharge power of dispatching from the factory corresponding with the lithium battery, really
It is set to the maximum Safety output power of the lithium battery.
Power supply system described herein includes lithium battery, fuel cell, microcontroller, first sensor, the second sensing
Device；Lithium battery is connect by first sensor with microcontroller；Microcontroller obtains the state of lithium battery by first sensor
Parameter；Fuel cell is connect by second sensor with microcontroller；Microcontroller obtains fuel cell by second sensor
State parameter；Microcontroller is used for, and according to state parameter, controls the input and/or output power of lithium battery and fuel cell.
Since power supply system provided by the present application includes lithium battery and fuel cell, and microcontroller determines lithium battery and fuel cell
Input and/or output power so that the battery for motor power supply includes lithium battery and fuel cell, also, lithium battery has
High-energy density and the advantages of can recycling to braking energy, allow the application that fuel cell system is overcome to exist continuous
The mileage that navigates is low, accelerates disadvantage insufficient on climbing capacity deficiency and energy feedback.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of Application Scenarios-Example figure of power supply system provided by the present application；
Fig. 2 is a kind of structural schematic diagram of power supply system disclosed in the embodiment of the present application；
Fig. 3 is the process of the determination method of the output power of a kind of lithium battery disclosed in the embodiment of the present application and fuel cell
Figure；
Fig. 4 be a kind of output power of lithium battery and fuel cell based on state machine disclosed in the embodiment of the present application really
Determine the flow chart of method.
Specific embodiment
Fig. 1 is a kind of Application Scenarios-Example figure of power supply system provided by the present application, wherein the motor in existing vehicle
It is connected with power supply system provided by the embodiments of the present application.Power supply system is used to control the input and/or recycling of battery capacity, to mention
The performance of high vehicle.
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
Fig. 2 be the embodiment of the present application disclosed in a kind of structural schematic diagram of power supply system, comprising: lithium battery, fuel cell,
Microcontroller, first sensor, second sensor, 3rd sensor.
Wherein, lithium battery is connect by first sensor with microcontroller；Lithium battery passes through two-way DC/AC converter and electricity
Machine connection；Fuel cell is connect by second sensor with microcontroller；Fuel cell pass sequentially through unidirectional DC/DC converter with
Two-way DC/AC converter is connected to motor；Unidirectional DC/DC converter is connect with microprocessor respectively with two-way DC/AC converter；
Motor is connect by 3rd sensor with microprocessor.
Wherein, first sensor is used to measure the state-of-charge of lithium battery, and measured state-of-charge is sent to micro-
Processor；
Second sensor is used to measure the state-of-charge of fuel cell, and measured state-of-charge is sent to micro process
Device；
Measured bearing power is sent to micro process for bearing power needed for measuring motor by 3rd sensor
Device；
Microprocessor is used for the parameter sent according to three sensors, determines the output power of lithium battery and fuel cell；
The power supply system further includes the first relay and the second relay, wherein the first relay respectively with two-way DC/AC
Converter, microprocessor are connected with lithium battery；Second relay is electric with unidirectional DC/DC converter, microprocessor and fuel respectively
Pond connection；
Wherein, microprocessor is also used to realize the connection or disconnection of lithium battery and motor by controlling the first relay.
Microprocessor is also used to realize the connection or disconnection of fuel cell and motor by controlling the second relay.
Wherein, unidirectional DC/DC converter arrives and bus voltage platform one for adjusting the output voltage of fuel cell
It causes.
Two-way DC/AC converter is exchange for bus voltage platform and motor to be consistent, and by DC conversion
Electricity.
In the present embodiment, the meaning of " two-way " is that battery is allowed to be that motor is powered in two-way DC/AC converter, is also allowed
The energy stores of motor recycling are in the battery.
Motor, 3rd sensor are further added by the basis of the power supply system of Fig. 2, wherein motor passes through 3rd sensor
It is connect with microcontroller, at this point, just constituting an electric system after addition motor and 3rd sensor.Wherein, power supply system
For providing power supply for motor, 3rd sensor is used to acquire the state parameter of motor, and the state parameter of acquisition is transmitted to
Microcontroller so that input power of the microcontroller based on received state parameter control lithium battery and fuel cell and/
Or output power.
Fig. 3 is a kind of determination method of the output power of lithium battery and fuel cell disclosed in the embodiment of the present application, is executed
Main body is the determining device of the output power of lithium battery and fuel cell, which can integrate in microprocessor, including following
Step:
S301, receive the state-of-charge and motor of the state-of-charge of lithium battery, fuel cell needed for bearing power.
S302, judge whether bearing power is greater than zero, if it is not, then S303 is executed, if it is, executing S304.
In this step, bearing power is greater than the lithium batteries such as zero expression and/or fuel cell needs to power to motor, this
When, vehicle may accelerate or travel at the uniform speed；Bearing power indicates vehicle brake braking less than zero or slows down.
In the present embodiment, when bearing power is less than 0, the kinetic energy of vehicle reduces, at this point, motor is moved what vehicle lost
Electric energy can be converted to, the electric energy converted can charge into lithium battery.
S303, fuel cell output power be 0, and determine according to the current state-of-charge of lithium battery the output of lithium battery
Power.
Specifically, the following steps are included:
A1, judge whether the state-of-charge of lithium battery is greater than predetermined upper threshold value, if it is greater, then A2 is executed, if not
It is greater than, then executes A3.
In the present embodiment, in order to promote the peak power output of lithium battery, the state-of-charge needs of lithium battery are maintained at
One reasonable level, therefore, in the present embodiment, in advance provided with lithium battery state-of-charge be in reasonable level it is corresponding on
Threshold value and lower threshold are limited, i.e., when the state-of-charge of lithium battery is between lower threshold and upper limit threshold, indicates lithium battery
State-of-charge be located at reasonable level.
Wherein, in order to guarantee that cell safety works, according to engineering experience, 0.9 is set by upper limit threshold, by lower threshold
It is set as 0.2.
A2, fuel cell output power be 0, the output power of lithium battery is 0.
In this step, since bearing power is less than 0, it is therefore not necessary to power for motor, therefore, the output of fuel cell
Power is 0, i.e., fuel cell is not necessarily to work.
In the present embodiment, when bearing power is less than 0, it can use the electric energy of motor recycling as lithium battery charging.By
In this step, the state-of-charge of lithium battery is greater than upper limit threshold, therefore, in order to keep the state-of-charge of lithium battery to be maintained at conjunction
Reason is horizontal, and therefore, the output power of lithium battery is 0, i.e. lithium battery does not only need to power but also is not required to charge.
A3, fuel cell output power be 0, and the current maximum charge power according to Vehicular charging power and lithium battery
Determine the output power of lithium battery.
In this step, since bearing power is less than 0, it is therefore not necessary to power for motor, therefore, the output of fuel cell
Power is 0, i.e., fuel cell is not necessarily to work.
In the present embodiment, when bearing power is less than 0, it can use the electric energy of motor recycling as lithium battery charging.By
In this step, the state-of-charge of lithium battery is less than predetermined upper threshold value, therefore, can charge for lithium battery.
In this step, Vehicular charging power indicates that motor is provided to the charge power of lithium battery；In the present embodiment,
According to the current state-of-charge of lithium battery, the maximum charge power of lithium battery is determined, it for convenience, will be according to lithium battery
The charge power that current state-of-charge is determined is the current maximum charge power of lithium battery.
Specifically, being filled by the current maximum that following formula (1) calculates lithium battery according to the current state-of-charge of lithium battery
Electrical power.
In formula, Pb, chg indicate the maximum charge power of lithium battery, and Pb, max_des expression are provided most by lithium battery factory
Big charge power, Vb indicate charging voltage, and Ib, max_chg indicate that the maximum charging current of lithium battery, SOC b indicate lithium battery
Current state-of-charge, SOC b, max indicate that the upper limit threshold of the state-of-charge of lithium battery, Cb indicate the polarization capacity of battery, L
Indicate preset step-length, Δ T indicates the sampling time.
In the present embodiment, the current maximum charge power of lithium battery cannot be greater than to the charge power of lithium battery.Therefore,
In the present embodiment, if Vehicular charging power is greater than the current maximum charge power of lithium battery, the output power of lithium battery
For the negative value of the absolute value of maximum charge power；If Vehicular charging power is not more than the current maximum charge power of lithium battery,
Then the output power of lithium battery is the negative value of the absolute value of Vehicular charging power.
It should be noted that in this step, the output power of lithium battery is negative value, what expression charged to lithium battery
Meaning, and be lithium battery charging power be negative value absolute value.
S304, judge whether bearing power is greater than the peak power output of fuel cell, if it is greater, then executing step
S305, if it is not greater, then executing step S306.
In this step, the peak power output of fuel cell is determined by the attribute of fuel cell, is provided with fuel in advance
The peak power output of battery.
S305, fuel cell output power be the peak power output of fuel cell, and the current lotus according to lithium battery
Whether electricity condition is lower than predetermined lower threshold value, determines the output power of lithium battery.
Specifically, the following steps are included:
B1, judge whether the current state-of-charge of lithium battery is lower than predetermined lower threshold value, if so, executing B2；If not,
Execute B3.
B2, lithium battery output power be 0.
In order to enable the state-of-charge of lithium battery is located at reasonable level, that is, it is located at predetermined lower threshold value and predetermined upper threshold value
Between, in this step, since the state-of-charge of lithium battery is already below predetermined lower threshold value, lithium battery is charged in order to prevent
State further decreases, accordingly, it is determined that the output power of lithium battery is 0.
B3, determine that the difference between bearing power and the maximum discharge power of fuel cell is the first difference.
B4, whether it is greater than the first difference according to the current maximum discharge power of lithium battery, determines the output power of lithium battery.
In this step, the current maximum discharge power of lithium battery and the current state-of-charge of lithium battery are related, this implementation
Example calculates the current maximum discharge power of lithium battery by following formula 2.
In formula, Pb, dchg indicate the maximum discharge power of lithium battery, and Pb, max_des expression are provided most by lithium battery factory
Big discharge power, Vb indicate charging voltage, and Ib, max_dchg indicate that the maximum discharge current of lithium battery, SOCb indicate lithium battery
Current state-of-charge, SOC b, min indicate that the lower threshold of the state-of-charge of lithium battery, Cb indicate battery polarization capacitor, L table
Show preset step-length, Δ T indicates the sampling time.
Specifically, if the maximum discharge power of lithium battery is not less than the first difference, it is determined that the output power of lithium battery
For the first difference；If the current maximum discharge power of lithium battery is less than the first difference, it is determined that the output power of lithium battery is
The current maximum discharge power of lithium battery.
S306, judge whether the current state-of-charge of lithium battery is lower than predetermined lower threshold value, if be lower than, execute
S307 executes S308 if be not less than.
S307, fuel cell output power be maximum discharge power, the output power of lithium battery be fuel cell most
The negative value of big discharge power and the absolute value of bearing power difference, until the state-of-charge of lithium battery reaches upper limit threshold.
In this step, in order to enable the state-of-charge of lithium battery is located at reasonable level, therefore, fuel cell is in addition to providing
Outside bearing power, it is also necessary to charge for lithium battery, therefore, the output power of fuel cell is maximum discharge power.It wherein, is electricity
It is the maximum discharge power of fuel cell and the difference of bearing power that machine offer bearing power, which is the charge power that lithium battery provides,
Value.
In the present embodiment, after executing S307, sequence executes S308.
S308, the foundation current maximum discharge power of lithium battery and the comparison result of bearing power, determine lithium battery and combustion
Expect the output power of battery.
Specifically, in this step, including two kinds of situations, the first situation are as follows: in the case where the state-of-charge of lithium battery is greater than
When limiting the current maximum discharge power of threshold value and lithium battery and being greater than bearing power, the output power of fuel cell is 0, lithium battery
Output power is bearing power.
In this step, in order to enable the state-of-charge of lithium battery is located at reasonable level, that is, it is located at lower threshold and the upper limit
Between threshold value, when the state-of-charge of lithium battery reaches upper limit threshold, lithium battery output power is needed to reduce working as lithium battery
Preceding state-of-charge lays the foundation to reach reasonable level.
Therefore, in order to enable the current state-of-charge of lithium battery is located at reasonable level as early as possible, in the current maximum of lithium battery
When discharge power is greater than bearing power, the output power of lithium battery is bearing power, and the output power of fuel cell is 0.
Second situation are as follows: be greater than the current maximum discharge power of lower threshold and lithium battery in the state-of-charge of lithium battery
When less than bearing power, determine that the output power of fuel cell is the second difference, the output power of lithium battery is working as lithium battery
Preceding maximum discharge power.
In this step, when the current maximum discharge power of lithium battery is less than bearing power, the load of lithium battery is determined
Power is current maximum discharge power；For the difference between bearing power and the current maximum discharge power of lithium battery by fuel electricity
Pond provides, and for convenience, in this step, the difference between bearing power and the current maximum discharge power of lithium battery is claimed
For the second difference, i.e. the output power of fuel cell is the second difference.
It on the one hand, include fuel cell and lithium battery in the power supply system of the present embodiment, since lithium battery has high-energy
It the advantages that density, long circulation life, can effectively make up that fuel cell course continuation mileage is low, accelerate the problem of climbing energy deficiency.
On the other hand, in the present embodiment, state-of-charge and charging and discharging capabilities so that lithium battery are considered, with lithium battery
State-of-charge be no more than lithium between lower threshold and upper limit threshold (prevent overcharge and over-discharge), and with charge-discharge electric power
The current charging and discharging capabilities of battery are foundation, determine the output power of fuel cell and lithium battery.
In summary two aspect, according to prevent from overcharging, over-discharge and make charging and discharging capabilities be no more than lithium battery it is current most
The measure of big charging and discharging capabilities, the distribution for outputting and inputting power to two batteries enable to lithium battery to be maintained at good
Level, therefore, it is possible to use lithium battery makes up the deficiency of fuel cell, specifically, in the biggish situation of load of vehicle,
Such as climb, lithium battery can make up the excessively slow situation of fuel cell response speed, to realize the purpose for promoting vehicle performance.
In the above-described embodiments, can using fuel cell and the output power of lithium battery at different conditions as state,
The state for meeting conditions present is determined by way of state machine.Specifically, whether being greater than zero with bearing power, and loading
The comparison result of bearing power and the maximum discharge power of fuel cell is trigger condition when power is greater than zero, determines state group；
With the current maximum charge and discharge of the current state-of-charge of lithium battery and lower threshold, the comparison result of upper limit threshold and lithium battery
Electrical power determines current state from fixed state group.
Specifically, in the present embodiment, providing nine kinds of states, as shown in the table.
| State | Pfc | Pb |
| S1 | 0 | 0 |
| S2 | 0 | -|Pm| |
| S3 | 0 | -|Pb,chg| |
| S4 | Pfc,max | Pm-Pfc,max |
| S5 | Pfc,max | Pb,dchg |
| S6 | Pfc,max | 0 |
| S7 | Pfc,max | -|Pfc,max-Pm| |
| S8 | 0 | Pm |
| S9 | Pm-Pb,dchg | Pb,dchg |
In the table, Pfc indicates that the output power of fuel cell, Pb indicate that the output power of lithium battery, Pm are load function
Rate, Pfc, max are the maximum discharge power of fuel cell, and Pb, dchg indicate the current maximum discharge power of lithium battery.
Each state in table 1 respectively indicates: S1 (state 1): the output power of fuel cell is 0, the output work of lithium battery
Rate is 0.
S2 (state 2): the output power of fuel cell is 0, if Vehicular charging power is greater than the current maximum of lithium battery
Charge power, then the output power of lithium battery is the opposite number of maximum charge power.
S3 (state 3): the output power of fuel cell is 0, if Vehicular charging power no more than lithium battery it is current most
Big charge power, then the output power of lithium battery is the opposite number of Vehicular charging power.
S4 (state 4): the output power of fuel cell is the peak power output of fuel cell, if the maximum of lithium battery
Discharge power is not less than the first difference, it is determined that the output power of lithium battery is the first difference.
S5 (state 5): the output power of fuel cell is the peak power output of fuel cell, if lithium battery is current
Maximum discharge power is less than the first difference, it is determined that the output power of lithium battery is the current maximum discharge power of lithium battery.
S6 (state 6): the output power of fuel cell is the peak power output of fuel cell, the output power of lithium battery
It is 0.
S7 (state 7): the output power of fuel cell is maximum discharge power, and the output power of lithium battery is fuel cell
Maximum discharge power and bearing power difference opposite number.
S8 (state 8): big in the current maximum discharge power that the state-of-charge of lithium battery is greater than upper limit threshold and lithium battery
When bearing power, the output power of fuel cell is 0, and the output power of lithium battery is bearing power.
S9 (state 9): small in the current maximum discharge power that the state-of-charge of lithium battery is greater than upper limit threshold and lithium battery
When bearing power, determine that the output power of fuel cell is the second difference, the output power of lithium battery is the current of lithium battery
Maximum discharge power.
Specifically, the conversion process between various states is as shown in figure 4, may include following situations according to trigger condition:
Wherein, according to trigger condition, S1, S2 and S3 are a state group, also known as first state group, and trigger condition is load
Power is less than zero.S4, S5 and S6 are a state group, and also known as the second state group, trigger condition is that bearing power is greater than fuel electricity
The maximum discharge power in pond.S7, S8 and S9 are a state group, and also known as third state group, trigger condition is greater than for bearing power
Zero and be less than fuel cell maximum discharge power.
For first state group, if the current state-of-charge of lithium battery is lower than lower threshold, enter S1, otherwise, into
Enter S2 or S3, specifically, entering S2 if the current maximum charge power of lithium battery is greater than Vehicular charging power, otherwise, enters
S3。
For the second state group, if the current state-of-charge of lithium battery is less than lower threshold, enters S6, otherwise enter
S4 or S5, specifically, if the current maximum discharge power of lithium battery is greater than the maximum electric discharge function of bearing power and fuel cell
The difference of rate then enters S4, otherwise, into S5.
For third state group, if the current state-of-charge of lithium battery is less than lower threshold, enters S7, otherwise enter
S8 or S9, specifically, entering S8, otherwise, into S9 if the current maximum discharge power of lithium battery is greater than bearing power.
In the present embodiment, after microprocessor determines the output power of lithium battery and fuel cell based on state machine, if
Output power is 0, at this point, the relay that microprocessor control is connect with battery is in an off state；If output power is not 0,
At this point, the relay that microprocessor control is connect with battery is in connected state；When not being 0 for output power, the present embodiment
In, microprocessor is connect with lithium battery, fuel cell respectively, the output power lithium battery and fuel that direct basis is determined
The output power of battery.
If function described in the embodiment of the present application method is realized in the form of SFU software functional unit and as independent production
Product when selling or using, can store in a storage medium readable by a compute device.Based on this understanding, the application is real
The part for applying a part that contributes to existing technology or the technical solution can be embodied in the form of software products,
The software product is stored in a storage medium, including some instructions are used so that a calculating equipment (can be personal meter
Calculation machine, server, mobile computing device or network equipment etc.) execute each embodiment the method for the application whole or portion
Step by step.And storage medium above-mentioned include: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), with
Machine accesses various Jie that can store program code such as memory (RAM, Random Access Memory), magnetic or disk
Matter.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with it is other
The difference of embodiment, same or similar part may refer to each other between each embodiment.
The foregoing description of the disclosed embodiments makes professional and technical personnel in the field can be realized or use the application.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the application.Therefore, the application
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of power supply system characterized by comprising
Lithium battery, fuel cell, microcontroller, first sensor, second sensor；
The lithium battery is connect by the first sensor with the microcontroller；The microcontroller is passed by described first
Sensor obtains the state parameter of the lithium battery；
The fuel cell is connect by the second sensor with the microcontroller；The microcontroller passes through described second
Sensor obtains the state parameter of the fuel cell；
The microcontroller is used for, according to the state parameter, control the lithium battery and the fuel cell input and/or
Output power.
2. system according to claim 1, which is characterized in that further include:
The first relay being connected with the motor of vehicle, the microprocessor and the lithium battery；The microprocessor is for leading to
It crosses and controls first relay, realize the connection or disconnection of the lithium battery Yu the motor；
The second relay being connected with the microprocessor and the fuel cell；The microprocessor is used for by described in control
Second relay realizes the connection or disconnection of the fuel cell Yu the motor.
3. system according to claim 1, which is characterized in that
The state parameter of the lithium battery includes: the state-of-charge of the lithium battery；
The state parameter of the fuel cell includes: the peak power output of the fuel cell.
4. system according to claim 3, which is characterized in that the microcontroller is used for, according to the state parameter, meter
The input and/or output power for calculating the lithium battery and the fuel cell includes:
The microcontroller is specifically used for, in the minus situation of the bearing power, the output power of the fuel cell
It is zero；
When the bearing power is less than zero and the state-of-charge of the lithium battery is not up to predetermined upper threshold value, determine described
The safe input power of maximum of the lithium battery under the state-of-charge of lithium battery；By the identified safe input power of maximum and electricity
Minimum value between the charge power of machine is the input power of the lithium battery；
When the bearing power is less than zero and the state-of-charge of the lithium battery reaches the predetermined upper threshold value, the lithium electricity
The input power in pond is zero.
5. system according to claim 4, which is characterized in that the microcontroller is used for, and is determined in the lithium battery
The safe input power of maximum of the lithium battery under state-of-charge, comprising:
The difference of the upper limit threshold of the state-of-charge of the state-of-charge and lithium battery according to the lithium battery, determines the lithium
The maximum safe charging electric current of battery；
According to computation rule is preset, the corresponding maximum safe charging power of the maximum safe charging electric current is determined；
By the minimum value in the factory maximum charge power of the maximum safe charging power and the lithium battery, it is determined as described
Maximum safe input power.
6. system according to claim 3, which is characterized in that the microcontroller is used for, according to the state parameter, meter
Calculate the input and/or output power of the lithium battery and the fuel cell, comprising:
When the bearing power is greater than zero and is greater than the peak power output of the fuel cell, the fuel cell is determined
Output power is peak power output；
When the bearing power is greater than zero and is greater than the peak power output of the fuel cell, if the lithium battery is worked as
Preceding state-of-charge is lower than predetermined lower threshold value, it is determined that the output power of the lithium battery is zero；
If the current state-of-charge of the lithium battery is higher than the predetermined lower threshold value, the current lotus in the lithium battery is determined
The maximum Safety output power of the lithium battery under electricity condition, with the output power of the lithium battery no more than the maximum safety
Output power is principle, determines the output power of the lithium battery.
7. system according to claim 6, which is characterized in that the microcontroller is used for, with the output of the lithium battery
Power is principle no more than the maximum Safety output power, determines the output power of the lithium battery, comprising:
In the case where the maximum Safety output power of the lithium battery is not less than the first power, the output of the lithium battery is determined
Power is maximum first power；First power is the peak power output of the bearing power and the fuel cell
Between difference；
In the case where the maximum Safety output power of the lithium battery is less than first power, the defeated of the lithium battery is determined
Power is zero out.
8. system according to claim 3, which is characterized in that the microcontroller is used for, according to the state parameter, meter
Calculate the input and/or output power of the lithium battery and the fuel cell, comprising:
When the bearing power is greater than the peak power output that zero is less than the fuel cell, if the lithium battery is current
State-of-charge is lower than predetermined lower threshold value, it is determined that charges by lithium battery of the second power, until the current lotus of the lithium battery
Electricity condition reaches the upper limit threshold；Second power is the exhausted of maximum discharge power and the bearing power difference of fuel cell
To value；The output power of the fuel cell is the peak power output of the fuel cell；
If the current state-of-charge of the lithium battery is greater than the predetermined lower threshold value, it is determined that in the current of the lithium battery
The maximum Safety output power of the lithium battery under state-of-charge；According to the maximum Safety output power of the lithium battery and load
The output power of the comparison result of power and the lithium battery is principle no more than the maximum Safety output power, is determined
The output power of the lithium battery.
9. system according to claim 8, which is characterized in that the microcontroller is used for, the maximum according to the lithium battery
The output power of the comparison result and the lithium battery of Safety output power and bearing power is defeated no more than the maximum safety
Power is principle out, determines the output power of the lithium battery, comprising:
The microcontroller is specifically used for, when the maximum Safety output power of the lithium battery is not less than the bearing power, really
The output power of the fixed lithium battery is the bearing power；It is less than in the maximum Safety output power of the lithium battery described negative
When carrying power, determine that the output power of the lithium battery is the maximum Safety output power of the lithium battery.
10. according to system described in claim 6~9 any one, which is characterized in that the determination is worked as the lithium battery
The maximum Safety output power of the lithium battery under preceding state-of-charge, comprising:
Difference between the lower threshold of the state-of-charge of the current state-of-charge and lithium battery according to the lithium battery determines
The maximum safe-discharge electric current of the lithium battery；
According to the maximum safe-discharge electric current, the maximum safe-discharge power of the lithium battery is determined；
By the minimum value in maximum safe-discharge power maximum discharge power of dispatching from the factory corresponding with the lithium battery, it is determined as
The maximum Safety output power of the lithium battery.
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| CN201811622089.XA CN109466381A (en) | 2018-12-28 | 2018-12-28 | A kind of power supply system |
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