CN117818383B - Composite battery system for vehicle and energy control method thereof - Google Patents
Composite battery system for vehicle and energy control method thereof Download PDFInfo
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- CN117818383B CN117818383B CN202410251211.6A CN202410251211A CN117818383B CN 117818383 B CN117818383 B CN 117818383B CN 202410251211 A CN202410251211 A CN 202410251211A CN 117818383 B CN117818383 B CN 117818383B
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- 239000002131 composite material Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 61
- 238000004146 energy storage Methods 0.000 claims abstract description 10
- 238000011217 control strategy Methods 0.000 claims description 60
- 238000007599 discharging Methods 0.000 claims description 27
- 238000006243 chemical reaction Methods 0.000 claims description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 11
- 229910052744 lithium Inorganic materials 0.000 claims description 11
- 238000011084 recovery Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 4
- 239000000178 monomer Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/66—Arrangements of batteries
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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
- 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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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
- 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
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
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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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The embodiment of the specification discloses a vehicle composite battery system and an energy control method thereof, relates to the technical field of energy storage, and is used for solving the problems of high cost and high control precision requirement of a composite battery in a hybrid electric vehicle. The system comprises: the device comprises an energy battery pack, a power battery pack, a unidirectional switch, a bidirectional switch and a switch control module; the external input port of the switch control module is respectively connected with the battery charge state output ports of the energy type battery pack and the power type battery pack, and the output port of the switch control module is respectively connected with the unidirectional switch and the bidirectional switch and is used for controlling the closing states of the unidirectional switch and the bidirectional switch; the unidirectional switch is connected with a branch circuit where the energy type battery pack is located and a branch circuit where the power type battery pack is located, and a parallel circuit of the energy type battery pack and the power type battery pack is constructed; one contact of the two-way switch is connected with the positive electrode of the energy type battery pack, and the other contact is connected with the positive electrode of the power type battery pack, and the two-way switch is used for arranging a charging loop of the composite battery system in the parallel loop.
Description
Technical Field
The present disclosure relates to the field of energy storage technologies, and in particular, to a composite battery system for a vehicle and an energy control method thereof.
Background
With the increasing severity of environmental and energy problems, there is an increasing concern about the development of new energy automobiles. The plug-in hybrid electric vehicle (PHEV) is a development focus of new energy vehicles, combines the advantages of long driving mileage of a traditional internal combustion engine and energy conservation and environmental protection of a pure electric vehicle, and can be charged by an external power supply. Because the energy consumed by the plug-in hybrid electric vehicle mainly comes from electric energy, the plug-in hybrid electric vehicle has higher energy economy, longer pure electric driving mileage, higher safety and longer cycle life. Because of the high standard requirements of the hybrid electric vehicle on energy and power, the single energy storage system is difficult to simultaneously meet the requirements of the hybrid electric vehicle on energy and power under the current technical state on the premise of not influencing the service life of a power supply system. Therefore, on the basis of fully playing the advantages of each energy storage system, the composite power supply formed by combining two or more energy storage systems is used for solving the problem of the hybrid electric vehicle.
However, in the existing composite power supply formed by combining a power battery, a super capacitor, a fuel cell and the like, the matching of the pure battery and the super capacitor is generally adopted, however, the voltage platform of the super capacitor is inconsistent with that of the pure battery, and the super capacitor also has the problems that the energy density is low, the large-capacity storage cannot be realized, the self-discharge is serious, the price is high and the like, so that the super capacitor has certain difficulty in practical application. In the scheme of matching the pure batteries, when the high-power module, such as the DC/DC converter, is used for supplying power, firstly, the high-power module has high cost, secondly, the high-power module has high requirements on the accuracy of a control system, system faults are easy to cause, and energy balance among batteries in the charging and discharging processes is difficult to realize.
Disclosure of Invention
In order to solve the above technical problems, one or more embodiments of the present disclosure provide a composite battery system for a vehicle and an energy control method thereof.
One or more embodiments of the present disclosure adopt the following technical solutions:
One or more embodiments of the present specification provide a composite battery system for a vehicle, the system including: the device comprises an energy battery pack, a power battery pack, a unidirectional switch, a bidirectional switch and a switch control module; wherein,
The first input port of the switch control module is connected with the battery state of charge output port of the energy battery pack, the second input port of the switch control module is connected with the battery state of charge output port of the power battery pack, the first output port of the switch control module is connected with the unidirectional switch, and the second output port of the switch control module is connected with the bidirectional switch and is used for controlling the closing states of the unidirectional switch and the bidirectional switch according to the battery state of charge values of the energy battery pack and the power battery pack;
the unidirectional switch is connected with a first branch circuit where the energy type battery pack is located and a second branch circuit where the power type battery pack is located, and is used for constructing a parallel loop of the energy type battery pack and the power type battery pack according to the output value of the first output port;
One contact of the two-way switch is connected with the positive electrode of the energy type battery pack, and the other contact is connected with the positive electrode of the power type battery pack and is used for setting a charging loop of the energy type battery pack and the power type battery pack according to the output value of the second port in the parallel loop.
Optionally, in one or more embodiments of the present disclosure, the controlling the closing states of the unidirectional switch and the bidirectional switch according to the battery state of charge values of the energy battery pack and the power battery pack specifically includes:
the switch control module determines the current running state of a vehicle where the vehicle composite battery system is located, and acquires battery charge state values of the energy type battery pack and the power type battery pack in the current running state;
Based on the battery charge state values of the energy type battery pack and the power type battery pack, respectively determining the residual electric quantity of the energy type battery pack and the power type battery pack, and comparing the residual electric quantity with a preset threshold value in the switch control module to obtain a comparison result;
And determining the Boolean values corresponding to the first output port and the second output port according to the comparison result, and respectively outputting the corresponding Boolean values to the unidirectional switch and the bidirectional switch to control the closing states of the unidirectional switch and the bidirectional switch.
Optionally, in one or more embodiments of the present specification, the system further comprises: the resistor is arranged on the first branch where the energy type battery pack is positioned and used for limiting the discharge current of the energy type battery pack; wherein the resistance value of the resistor is 1Ω.
Optionally, in one or more embodiments of the present disclosure, the power battery pack is a high power density lithium battery formed by connecting a plurality of lithium battery cells in series-parallel, for supplying high power to a vehicle; the energy type battery pack is a lithium battery with high energy density and formed by connecting a plurality of lithium battery monomers in series and parallel, and is used for guaranteeing the energy storage requirement of a system.
One or more embodiments of the present specification provide an energy control method of a composite battery system for a vehicle, the method including:
The method comprises the steps that a switch control module obtains the current working condition state of a vehicle where a vehicle composite battery system is located, so that the current energy control strategy corresponding to the vehicle composite battery system is determined according to the current working condition state; wherein, the current working condition state includes: running state, braking state, charging state; the current energy control strategy includes: a charging energy control strategy, a recovery energy control strategy, and a discharging energy control strategy;
Based on an input port of the switch control module, acquiring battery charge values of the energy type battery pack and the power type battery pack in the vehicle composite battery system;
Determining the to-be-converted closing states of the unidirectional switch and the bidirectional switch based on the current energy control strategy and battery charge values of the energy type battery pack and the power type battery pack;
And the unidirectional switch and the bidirectional switch are controlled to be converted into the to-be-converted closed state, so that the charge and discharge energy balance of the energy type battery pack and the power type battery pack is realized.
Optionally, in one or more embodiments of the present disclosure, determining the to-be-converted closed states of the unidirectional switch and the bidirectional switch based on the current energy control policy and the battery charge values of the energy battery pack and the power battery pack specifically includes:
Based on the current energy control strategy and battery charge values of the energy type battery pack and the power type battery pack, determining to-be-converted closing states of the unidirectional switch and the bidirectional switch specifically comprises:
If the current energy control strategy is determined to be a discharge energy control strategy, determining a current discharge battery pack of a vehicle where the vehicle composite battery system is located based on a battery charge value of the power battery pack and a preset battery charge threshold; wherein the preset battery charge threshold value comprises: a preset conversion threshold value, a preset upper limit value corresponding to the power type battery pack and the energy type battery pack and a preset lower limit value;
Detecting the real-time battery charge value of the current discharging battery pack in real time, and if the current discharging battery pack is determined to be the power type battery pack and the battery charge value is smaller than or equal to a preset conversion threshold value, determining that the to-be-converted closing state of the unidirectional switch is a closing state;
if the current discharging battery pack is determined to be the energy type battery pack and the battery charge value of the energy type battery pack is smaller than or equal to the preset lower limit value of the energy type battery pack, determining that the to-be-converted closing state of the unidirectional switch is an opening state;
If the current discharging battery pack is determined to be the energy type battery pack and the battery charge value of the power type battery pack is larger than or equal to the preset upper limit value of the power type battery pack, determining that the to-be-converted closing state of the unidirectional switch is an opening state;
And if the current discharging battery pack is determined to be the power type battery pack and the energy type battery pack, and the battery charge value of the power type battery pack is greater than or equal to the preset upper limit value of the power type battery pack, determining that the to-be-converted closed state of the unidirectional switch is an open state.
Optionally, in one or more embodiments of the present disclosure, determining, based on a battery charge value of the power type battery pack and a preset battery charge threshold, a current discharge battery pack of a vehicle in which the vehicle composite battery system is located specifically includes:
If the battery charge value of the power type battery pack is larger than a preset conversion threshold value, determining that the current power supply battery pack of the vehicle where the vehicle composite battery system is located is the power type battery pack;
If the battery charge value of the power type battery pack is smaller than a preset conversion threshold value, determining that the current power supply battery pack of the vehicle where the vehicle composite battery system is located is the power type battery pack and the energy type battery pack;
And if the battery charge value of the power type battery pack is smaller than the preset lower limit value of the power type battery pack, determining that the current power supply battery pack of the vehicle where the vehicle composite battery system is positioned is the energy type battery pack.
Optionally, in one or more embodiments of the present disclosure, determining the to-be-converted closed states of the unidirectional switch and the bidirectional switch based on the current energy control policy and the battery charge values of the energy battery pack and the power battery pack specifically includes:
If the current energy control strategy is determined to be the recovered energy control strategy, the electric energy is recovered to the power type battery pack by converting the first switch end of the bidirectional switch into a closed state; the first switch end is connected with the positive electrode of the power type battery pack;
And detecting the real-time battery charge value of the power type battery pack in real time, and if the real-time battery charge value is larger than or equal to the preset upper limit value of the power type battery pack, determining that the to-be-converted closed state of the first switch end of the bidirectional switch is an open state.
Optionally, in one or more embodiments of the present disclosure, determining the to-be-converted closed states of the unidirectional switch and the bidirectional switch based on the current energy control policy and the battery charge values of the energy battery pack and the power battery pack specifically includes:
If the current energy control strategy is determined to be a charging energy control strategy, determining that the to-be-converted closing state of the first switch end of the bidirectional switch is a closing state so as to charge the power type battery pack;
Detecting a real-time battery charge value of the power type battery pack in real time, and if the real-time battery charge value is equal to a preset upper limit value of the power type battery pack, determining that a to-be-converted closed state of a first switch end on the bidirectional switch is an open state and a to-be-converted closed state of a second switch end on the bidirectional switch is a closed state; the second switch end is connected with the positive electrode of the energy type battery pack;
and detecting the real-time battery charge value of the energy type battery pack in real time, and if the real-time battery charge value of the energy type battery pack is equal to the preset upper limit value of the energy type battery pack, determining that the to-be-converted closed state of the second switch end on the two-way switch is an open state.
Optionally, in one or more embodiments of the present disclosure, controlling the unidirectional switch and the bidirectional switch to the to-be-switched closed state specifically includes:
determining a to-be-converted closed state corresponding to the unidirectional switch and the bidirectional switch, so as to determine a Boolean value corresponding to each output port of the control module based on the to-be-converted state;
And controlling the unidirectional switch and the bidirectional switch to perform state transition based on the Boolean value so as to realize charge and discharge energy balance of the energy type battery pack and the power type battery pack.
The above-mentioned at least one technical scheme that this description embodiment adopted can reach following beneficial effect:
The control on whether the energy type battery pack participates in discharging is realized through the closing and opening of the unidirectional switch, and the charging loop construction on the energy type battery pack and the power type battery pack is realized through the closing and opening of the bidirectional switch. The switch control module realizes the control of the unidirectional switch and the bidirectional switch based on an energy control strategy, thereby not only meeting the storage and release of energy of the vehicle in different states and improving the energy utilization rate of the composite battery system, but also realizing the purpose of carrying out electric quantity equalization based on the actual condition of the vehicle. In addition, based on the mode of constructing the composite battery system by the energy type battery pack and the power type battery pack, compared with the existing super capacitor and battery composite production cost, the method is low, and is beneficial to the production and popularization of the whole vehicle.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some of the embodiments described in the present description, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a schematic structural diagram of a composite battery system for a vehicle according to an embodiment of the present disclosure;
Fig. 2 is a schematic diagram of an external port of a switch control module according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of an energy control method of a vehicle composite battery system according to an embodiment of the present disclosure;
FIG. 4 is a logic flow diagram of energy control under a discharge energy control strategy provided in an embodiment of the present disclosure;
Fig. 5 is a current flow chart of a power battery pack according to an embodiment of the present disclosure when the power battery pack is discharged alone;
Fig. 6 is a current flow chart when the power type battery pack and the energy type battery are discharged together according to the embodiment of the present disclosure;
fig. 7 is a current flow chart of an energy type battery pack according to an embodiment of the present disclosure when the energy type battery pack is discharged alone;
fig. 8 is a logic flow diagram of energy control under a charging energy control strategy according to an embodiment of the present disclosure.
Detailed Description
The embodiment of the specification provides a composite battery system for a vehicle and an energy control method thereof.
In order to make the technical solutions in the present specification better understood by those skilled in the art, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only some embodiments of the present specification, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present disclosure.
As shown in fig. 1, the embodiment of the present disclosure provides a schematic structural diagram of a composite battery system for a vehicle. As can be seen from fig. 1, the embodiment of the present disclosure proposes a composite battery system having a simple structure and low production cost, which includes as shown in fig. 1: the device comprises an energy battery pack, a power battery pack, a one-way switch, a two-way switch and a switch control module. As shown in fig. 2, a first input port of the switch control module is connected to a battery state of charge output port of the energy-type battery pack, and a second input port of the switch control module is connected to the battery state of charge output port of the power-type battery pack, so as to obtain the energy-type battery pack and the power-type battery pack in real timeValues. And meanwhile, a first output port of the switch control module is connected with a second output port of the unidirectional switch and is connected with the bidirectional switch, so that the closing states of the unidirectional switch and the bidirectional switch are controlled according to the battery charge state values of the energy type battery pack and the power type battery pack.
In addition, the unidirectional switch is connected with the first branch circuit where the energy type battery pack is located and the second branch circuit where the power type battery pack is located, so that a parallel loop of the energy type battery pack and the power type battery pack can be constructed based on the unidirectional switch closing state determined by the output value of the first port of the switch control module. The control on whether the energy type battery pack participates in discharging or not is realized through the closing and opening of the unidirectional switch, namely, the energy type battery pack and the power type battery pack are connected in parallel when the unidirectional switch is closed, at the moment, the energy type battery pack or the energy type battery pack and the power type battery pack provide required power for a vehicle together, and the energy type battery pack does not participate in the discharging process when the unidirectional switch is opened. That is, whether the energy type battery pack participates in the discharging process is controlled through the unidirectional switch, so that the effect of carrying out electric quantity equalization use based on actual conditions is achieved.
In order to realize that the power type battery pack and the energy type battery pack can be charged independently during charging, one contact of a bidirectional switch in the vehicle composite battery system is connected with the positive electrode of the energy type battery pack, and the other contact is connected with the positive electrode of the power type battery pack, so that when the unidirectional switch is closed to form a parallel circuit, a charging circuit of the energy type battery pack and the power type battery pack can be arranged in the parallel circuit according to the output value of the second port of the switch control module.
Further, in one or more embodiments of the present disclosure, according to the battery charge state values of the energy battery pack and the power battery pack, the closing states of the unidirectional switch and the bidirectional switch are controlled, which specifically includes the following procedures: firstly, a switch control module determines the current running state of a vehicle where a vehicle composite battery system is located, and obtains battery charge state values of an energy type battery pack and a power type battery pack in the current running state.
And the energy type battery pack and the power type battery pack are respectively determined according to the battery charge state values of the energy type battery pack and the power type battery pack, and the residual electric quantity is compared with a preset threshold value in the switch control module to obtain a comparison result. And determining the Boolean value 0/1 corresponding to the first output port and the second output port in the switch control module according to the comparison result, and further outputting the corresponding Boolean value to the unidirectional switch and the bidirectional switch respectively to realize switching control on the closed states of the unidirectional switch and the bidirectional switch.
Further, in one or more embodiments of the present description, the system further comprises: and the resistor is arranged on the first branch where the energy type battery pack is positioned and used for limiting the discharge current of the energy type battery pack, wherein the resistance value of the resistor is 1 omega.
Further, in order to meet the high power requirement of the vehicle and the energy storage requirement of the system, in one or more embodiments of the present disclosure, the power type battery pack is formed by connecting a plurality of lithium battery cells in series and parallel, and is used for meeting the high power requirement of the vehicle, and the energy type battery pack is formed by connecting a plurality of lithium battery cells in series and parallel, and is used for meeting the energy storage requirement of the system. The lithium battery used by the composite power supply system has the advantages of high energy density, light weight and long cycle life compared with a lead-acid battery, and the production cost based on battery composite is low compared with that of the traditional super capacitor and battery composite, thereby being beneficial to the production and popularization of the whole vehicle.
As shown in fig. 3, in the embodiment of the present disclosure, a flow chart of an energy control method of a vehicle composite battery system is provided. As can be seen from fig. 3, in one or more embodiments of the present disclosure, an energy control method of a composite battery system for a vehicle includes the following steps:
S301: the method comprises the steps that a switch control module obtains the current working condition state of a vehicle where a vehicle composite battery system is located, so that the current energy control strategy corresponding to the vehicle composite battery system is determined according to the current working condition state; wherein, the current working condition state includes: running state, braking state, charging state; the current energy control strategy includes: charging energy control strategy, recovery energy control strategy, discharging energy control strategy.
In order to meet the requirements of energy storage and release in a driving state, a braking energy recovery state and a charging state of a vehicle and improve the energy utilization rate of the composite battery system, the embodiment of the specification controls the closing states of the unidirectional switch and the bidirectional switch based on a switch control module in the vehicle composite battery system. Specifically, the switch control module firstly obtains a current working condition state of a vehicle where the vehicle composite battery system is located, wherein the current working condition state comprises: driving state, braking state, charging state. And determining the current energy control strategy corresponding to the vehicle composite battery system according to the current working condition state. It should be noted that the current energy control strategy includes: charging energy control strategy, recovery energy control strategy, discharging energy control strategy. It will be appreciated that the vehicle requires battery power during normal driving conditions, and thus the current energy control strategy is a discharge energy control strategy at this time, whereas when the vehicle is in a braking state, for example, in a long downhill condition, the vehicle is in an energy recovery state for a long time, during which electrical energy can be recovered into the power battery pack, i.e., the current energy control strategy is a recovered energy control strategy at this time. And the vehicle corresponds to a charge energy control strategy in a normal state of charge.
S302: and acquiring battery charge values of the energy type battery pack and the power type battery pack in the vehicle composite battery system based on the input port of the switch control module.
In order to achieve equalization and replenishment of electric quantity of the composite battery system under various working conditions, in the embodiment of the present disclosure, according to the input port of the switch control module in the system embodiment, battery charge values of the energy type battery pack and the power type battery pack in the composite battery system for a vehicle are respectively obtained.
S303: and determining the to-be-converted closing states of the unidirectional switch and the bidirectional switch based on the current energy control strategy and battery charge values of the energy type battery pack and the power type battery pack.
After the battery charge values of the energy-type battery pack and the power-type battery pack are obtained in the step S302, because the energy control strategies in different states are different, in the embodiment of the present disclosure, the to-be-converted closed states of the unidirectional switch and the bidirectional switch are determined according to the current energy control strategy and the battery charge values of the energy-type battery pack and the power-type battery pack, so as to achieve the purpose of balancing and supplementing electric quantity.
Specifically, in one or more embodiments of the present disclosure, when the current energy control policy is a discharge energy control policy as shown in fig. 4, determining the to-be-converted closed states of the unidirectional switch and the bidirectional switch based on the current energy control policy and the battery charge values of the energy battery pack and the power battery pack specifically includes the following procedures:
When the vehicle runs under the normal working condition, as shown in fig. 5, the power type battery pack supplies power to the whole vehicle, the balance of electric quantity is realized by dynamically adjusting the power of the engine, the energy type battery pack is not needed to participate at the moment, the battery charge value of the power type battery pack is reduced after the vehicle runs for a period of time, and the current discharging battery pack of the vehicle where the vehicle composite battery system is positioned is determined based on the battery charge value of the power type battery pack and a preset battery charge threshold value at the moment. The following description is needed: the preset battery charge threshold value comprises the following steps: preset upper limit value of power type battery pack Preset upper limit value of energy type battery packPreset lower limit value/>, of power type battery packPreset lower limit value/>, of energy type battery packPreset transition threshold/>And the preset conversion threshold is larger than the preset lower limit value of the power type battery pack and smaller than the preset upper limit value of the power type battery pack.
Then, detecting the real-time battery charge value of the current discharging battery pack in real time, if the current discharging battery pack is determined to be a power type battery pack, and the battery charge value is smaller than or equal to a preset conversion threshold valueThe to-be-converted closed state of the unidirectional switch is determined to be the closed state. That is to say after a period of travel, the power battery/>The value is reduced to/>And at the moment, an output port corresponding to the unidirectional switch in the switch control module outputs a Boolean value 1, so that the unidirectional switch 1 is closed, and the energy type battery pack participates.
And if the current discharging battery pack is determined to be an energy type battery pack and the battery charge value of the energy type battery pack is smaller than or equal to the preset lower limit value of the energy type battery pack, determining that the to-be-converted closing state of the unidirectional switch is an opening state. That is, if the energy type battery pack is added after the energy type battery pack is addedThe value is reduced to/>The composite battery system ends the external discharge.
And if the current discharging battery pack is determined to be an energy type battery pack and the battery charge value of the power type battery pack is larger than or equal to the preset upper limit value of the power type battery pack, determining that the to-be-converted closing state of the unidirectional switch is an opening state. That is, as shown in fig. 6, after the unidirectional switch is closed, the energy type battery pack and the power type battery pack form a parallel circuit, at this time, if the battery charge value of the power type battery pack is less than or equal to the preset lower limit value of the power type battery pack, the energy type battery also charges the power type battery when the whole vehicle is powered, so at this time, if the battery charge value of the power type battery pack is greater than or equal to the preset upper limit value of the power type battery pack, it is determined that the power type battery pack can be powered independently at this time, so that the to-be-converted closed state of the unidirectional switch is an open state, so that the energy type battery pack does not participate in discharging at this time.
As shown in the current flow chart of fig. 7, if it is determined that the currently discharged battery pack is a power type battery pack and the energy type battery packs, that is, the power type battery pack and the energy type battery pack, supply power to the whole vehicle together, and if the battery charge value of the power type battery pack is greater than or equal to the preset upper limit value of the power type battery pack in the power supply process, it is determined that the to-be-converted closed state of the unidirectional switch is an open state.
That is, when the discharge energy control strategy corresponding to the vehicle in the running state is controlled, the process is as follows:
(1) When the vehicle runs under the normal working condition, the power type battery pack supplies power to the whole vehicle, and the balance of electric quantity is realized by dynamically adjusting the power of the engine, so that the participation of the energy type battery pack is not needed;
(2) After a period of travel, the power battery pack The value is reduced to/>When the output port 1 of the switch control module outputs the Boolean value 1, the unidirectional switch is closed, so that the energy type battery pack participates in discharging. At this time, the power type battery pack and the energy type battery pack supply power for the whole vehicle together;
(3) In power-type batteries The value is further reduced to/>When the power type battery pack is not involved in discharging any more, the energy type battery pack charges the power type battery pack while supplying power to a vehicle load;
(4) The power type battery pack is detected by the switch control module The value rises to/>When the output port 1 of the switch control module outputs a Boolean value of 0, the unidirectional switch is disconnected, and the energy type battery pack is not discharged any more;
then, the composite battery system performs cyclic discharge with this control strategy until the energy type battery pack The value is reduced to/>The composite battery system ends the external discharge.
Further, in one or more embodiments of the present disclosure, determining a current discharge battery pack of a vehicle in which the composite battery system is located based on a battery charge value of the power battery pack and a preset battery charge threshold value specifically includes the following steps:
And if the battery charge value of the power type battery pack is larger than the preset conversion threshold value, determining that the current power supply battery pack of the vehicle where the vehicle composite battery system is positioned is the power type battery pack. And if the battery charge value of the power type battery pack is smaller than the preset conversion threshold value, determining the current power supply battery pack of the vehicle where the vehicle composite battery system is positioned as the power type battery pack and the energy type battery pack. And if the battery charge value of the power type battery pack is smaller than the preset lower limit value, determining that the current power supply battery pack of the vehicle where the vehicle composite battery system is positioned is an energy type battery pack.
In one or more embodiments of the present disclosure, if it is determined that the current energy control strategy is a recovered energy control strategy, then determining the to-be-converted closed states of the unidirectional switch and the bidirectional switch based on the current energy control strategy and the battery charge values of the energy battery pack and the power battery pack at this time specifically includes the following procedures:
If the current energy control strategy is determined to be the recovered energy control strategy, the recovery of the electric energy into the power type battery pack is realized by converting the first switch end of the bidirectional switch into a closed state; it is understood that the first switch end is connected with the positive electrode of the power type battery pack. And then detecting the real-time battery charge value of the power type battery pack in real time, and if the real-time battery charge value is greater than or equal to the preset upper limit value, determining that the to-be-converted closed state of the first switch end of the bidirectional switch is an open state.
The energy control process under the recovery energy control strategy in a certain application scene of the specification is as follows: when the vehicle is in an energy recovery state for a long time under a long downhill working condition, in the process, the electric energy can be recovered into the power type battery pack, and when the power type battery pack is in a power type battery packValue reaches/>When, for example, the/>, of a power batteryWhen the value rises to 100%, the charging of the power type battery pack is stopped.
If it is determined that the current energy control strategy is a charging energy control strategy, in one or more embodiments of the present disclosure, as shown in fig. 8, the to-be-converted closed states of the unidirectional switch and the bidirectional switch are determined based on the current energy control strategy and the battery charge values of the energy-type battery pack and the power-type battery pack, which specifically includes the following procedures:
Firstly, determining that the to-be-converted closed state of a first switch end of the bidirectional switch is a closed state so as to charge the power type battery pack. And detecting the real-time battery charge value of the power type battery pack in real time, and if the real-time battery charge value is equal to the preset upper limit value of the power type battery pack, determining that the to-be-converted closed state of the first switch end on the two-way switch is an open state and the to-be-converted closed state of the second switch end on the two-way switch is a closed state. The second switch end is connected with the positive electrode of the energy type battery pack.
And then detecting the real-time battery charge value of the energy type battery pack in real time, and if the real-time battery charge value of the energy type battery pack is equal to the preset upper limit value of the energy type battery pack, determining that the to-be-converted closed state of the second switch end on the bidirectional switch is an open state, and ending the charging.
S304: and the unidirectional switch and the bidirectional switch are controlled to be converted into the to-be-converted closed state, so that the charge and discharge energy balance of the energy type battery pack and the power type battery pack is realized.
After determining the to-be-converted closed state of the unidirectional switch and the unidirectional switch based on the step S303, the unidirectional switch and the bidirectional switch are controlled to be converted into the to-be-converted closed state, so that the charge and discharge energy balance of the energy type battery pack and the power type battery pack is realized.
Specifically, in one or more embodiments of the present disclosure, the switching between the unidirectional switch and the bidirectional switch to the to-be-switched closed state is controlled, which specifically includes the following steps:
Firstly, determining a to-be-converted closing state corresponding to the unidirectional switch and the bidirectional switch, and determining that the Boolean value corresponding to each output port of the control module is 1 or 0 based on the to-be-converted state. And then, controlling the unidirectional switch and the bidirectional switch to perform state transition according to the corresponding Boolean value, so as to realize the charge and discharge energy balance of the energy type battery pack and the power type battery pack.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for apparatus, devices, non-volatile computer storage medium embodiments, the description is relatively simple, as it is substantially similar to method embodiments, with reference to the section of the method embodiments being relevant.
The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
The foregoing is merely one or more embodiments of the present description and is not intended to limit the present description. Various modifications and alterations to one or more embodiments of this description will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of one or more embodiments of the present description, is intended to be included within the scope of the claims of the present description.
Claims (7)
1. An energy control method for a composite battery system for a vehicle, the method being characterized by being applied to the composite battery system for the vehicle, the system comprising: the device comprises an energy type battery pack, a power type battery pack, a one-way switch, a two-way switch and a switch control module; wherein,
The first input port of the switch control module is connected with the battery state of charge output port of the energy battery pack, the second input port of the switch control module is connected with the battery state of charge output port of the power battery pack, the first output port of the switch control module is connected with the unidirectional switch, and the second output port of the switch control module is connected with the bidirectional switch and is used for controlling the closing states of the unidirectional switch and the bidirectional switch according to the battery state of charge values of the energy battery pack and the power battery pack;
the unidirectional switch is connected with a first branch circuit where the energy type battery pack is located and a second branch circuit where the power type battery pack is located, and is used for constructing a parallel loop of the energy type battery pack and the power type battery pack according to the output value of the first output port;
One contact of the two-way switch is connected with the positive electrode of the energy type battery pack, and the other contact is connected with the positive electrode of the power type battery pack and is used for setting a charging loop of the energy type battery pack and the power type battery pack according to the output value of the second output port in the parallel loop; the method comprises the following steps:
The method comprises the steps that a switch control module obtains the current working condition state of a vehicle where a vehicle composite battery system is located, so that the current energy control strategy corresponding to the vehicle composite battery system is determined according to the current working condition state; wherein, the current working condition state includes: running state, braking state, charging state; the current energy control strategy includes: a charging energy control strategy, a recovery energy control strategy, and a discharging energy control strategy;
Based on an input port of the switch control module, battery charge values of an energy type battery pack and a power type battery pack in the vehicle composite battery system are obtained;
Determining the to-be-converted closing states of the unidirectional switch and the bidirectional switch based on the current energy control strategy and battery charge values of the energy type battery pack and the power type battery pack;
The unidirectional switch and the bidirectional switch are controlled to be converted into the to-be-converted closed state, so that the charge and discharge energy balance of the energy type battery pack and the power type battery pack is realized;
Based on the current energy control strategy and battery charge values of the energy type battery pack and the power type battery pack, determining to-be-converted closing states of the unidirectional switch and the bidirectional switch specifically comprises:
If the current energy control strategy is determined to be a discharge energy control strategy, determining a current discharge battery pack of a vehicle where the vehicle composite battery system is located based on a battery charge value of the power battery pack and a preset battery charge threshold; wherein the preset battery charge threshold value comprises: a preset conversion threshold value, a preset upper limit value corresponding to the power type battery pack and the energy type battery pack and a preset lower limit value;
Detecting the real-time battery charge value of the current discharging battery pack in real time, and if the current discharging battery pack is determined to be the power type battery pack and the battery charge value is smaller than or equal to a preset conversion threshold value, determining that the to-be-converted closing state of the unidirectional switch is a closing state;
if the current discharging battery pack is determined to be the energy type battery pack and the battery charge value of the energy type battery pack is smaller than or equal to the preset lower limit value of the energy type battery pack, determining that the to-be-converted closing state of the unidirectional switch is an opening state;
If the current discharging battery pack is determined to be the energy type battery pack and the battery charge value of the power type battery pack is larger than or equal to the preset upper limit value of the power type battery pack, determining that the to-be-converted closing state of the unidirectional switch is an opening state;
And if the current discharging battery pack is determined to be the power type battery pack and the energy type battery pack, and the battery charge value of the power type battery pack is greater than or equal to the preset upper limit value of the power type battery pack, determining that the to-be-converted closed state of the unidirectional switch is an open state.
2. The method for controlling energy of a vehicle composite battery system according to claim 1, wherein determining a currently discharged battery pack of a vehicle in which the vehicle composite battery system is located based on a battery charge value of the power battery pack and a preset battery charge threshold value specifically comprises:
If the battery charge value of the power type battery pack is larger than a preset conversion threshold value, determining that the current power supply battery pack of the vehicle where the vehicle composite battery system is located is the power type battery pack;
If the battery charge value of the power type battery pack is smaller than a preset conversion threshold value, determining that the current power supply battery pack of the vehicle where the vehicle composite battery system is located is the power type battery pack and the energy type battery pack;
And if the battery charge value of the power type battery pack is smaller than the preset lower limit value of the power type battery pack, determining that the current power supply battery pack of the vehicle where the vehicle composite battery system is positioned is the energy type battery pack.
3. The method for controlling energy of a composite battery system for a vehicle according to claim 1, wherein determining the to-be-converted closed states of the unidirectional switch and the bidirectional switch based on the current energy control strategy and the battery charge values of the energy battery pack and the power battery pack specifically comprises:
If the current energy control strategy is determined to be the recovered energy control strategy, the electric energy is recovered to the power type battery pack by converting the first switch end of the bidirectional switch into a closed state; the first switch end is connected with the positive electrode of the power type battery pack;
And detecting the real-time battery charge value of the power type battery pack in real time, and if the real-time battery charge value is larger than or equal to the preset upper limit value of the power type battery pack, determining that the to-be-converted closed state of the first switch end of the bidirectional switch is an open state.
4. The method for controlling energy of a composite battery system for a vehicle according to claim 1, wherein determining the to-be-converted closed states of the unidirectional switch and the bidirectional switch based on the current energy control strategy and the battery charge values of the energy battery pack and the power battery pack specifically comprises:
If the current energy control strategy is determined to be a charging energy control strategy, determining that the to-be-converted closing state of the first switch end of the bidirectional switch is a closing state so as to charge the power type battery pack;
Detecting a real-time battery charge value of the power type battery pack in real time, and if the real-time battery charge value is equal to a preset upper limit value of the power type battery pack, determining that a to-be-converted closed state of a first switch end on the bidirectional switch is an open state and a to-be-converted closed state of a second switch end on the bidirectional switch is a closed state; the second switch end is connected with the positive electrode of the energy type battery pack;
and detecting the real-time battery charge value of the energy type battery pack in real time, and if the real-time battery charge value of the energy type battery pack is equal to the preset upper limit value of the energy type battery pack, determining that the to-be-converted closed state of the second switch end on the two-way switch is an open state.
5. The method for controlling energy of a composite battery system for a vehicle according to claim 1, wherein controlling the unidirectional switch and the bidirectional switch to the to-be-switched closed state comprises:
Determining a to-be-converted closed state corresponding to the unidirectional switch and the bidirectional switch, so as to determine a Boolean value corresponding to each output port of the control module based on the to-be-converted closed state;
And controlling the unidirectional switch and the bidirectional switch to perform state transition based on the Boolean value so as to realize charge and discharge energy balance of the energy type battery pack and the power type battery pack.
6. The energy control method of a composite battery system for a vehicle according to claim 1, characterized in that the system further comprises: the resistor is arranged on the first branch where the energy type battery pack is positioned and used for limiting the discharge current of the energy type battery pack; wherein the resistance value of the resistor is 1Ω.
7. The method for controlling energy of a composite battery system for a vehicle according to claim 1, wherein the power battery pack is a high power density lithium battery formed by connecting a plurality of lithium battery cells in series and parallel for supplying high power demand to the vehicle; the energy type battery pack is a lithium battery with high energy density and formed by connecting a plurality of lithium battery monomers in series and parallel, and is used for guaranteeing the energy storage requirement of a system.
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