CN113852164A - Charging and discharging control method and device for parallel double battery packs and storage medium - Google Patents
Charging and discharging control method and device for parallel double battery packs and storage medium Download PDFInfo
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- CN113852164A CN113852164A CN202111132577.4A CN202111132577A CN113852164A CN 113852164 A CN113852164 A CN 113852164A CN 202111132577 A CN202111132577 A CN 202111132577A CN 113852164 A CN113852164 A CN 113852164A
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- 238000007599 discharging Methods 0.000 title claims description 34
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
Abstract
The invention discloses a charge-discharge control method, equipment and a storage medium for parallel double battery packs, wherein the method comprises the following steps: and when the travelling crane is powered on, the first battery pack is powered on. If the output power supply condition of the second battery pack is met, the second battery pack is enabled to output power supply; if the output power of the second battery pack is larger than the power required by the electric appliances of the whole vehicle, the converted output of the second battery pack is used for supplying power and charging the first battery pack; if the output power of the second battery pack is smaller than the power required by the electric appliances of the whole vehicle, the output of the first battery pack and the converted output of the second battery pack are used for supplying power together; and if any one or more of the output power supply conditions of the second battery pack are not met, enabling the first battery pack to carry out independent output power supply. The driving power-off, charging power-on and power-off scenes are controlled, and the problem of reasonable charge and discharge control of the parallel double battery packs is solved by adjusting the use of the first battery pack and the second battery pack in each use scene.
Description
Technical Field
The invention relates to the field of charge and discharge control of parallel double battery packs, in particular to a charge and discharge control method and device of the parallel double battery packs and a computer readable storage medium.
Background
The current electric automobile has the problems of inconvenient charging, few facilities and slow charging, and the user demands for long driving range more and more strongly. Therefore, how to increase the endurance mileage on the premise of ensuring the dynamic property, the economic property and the drivability becomes a technical problem to be solved urgently in the field.
Disclosure of Invention
The invention mainly aims to provide a charging and discharging control method for parallel double battery packs, and aims to solve the technical problem that energy control is performed on the parallel double battery packs in the prior art to improve use experience.
In order to achieve the above object, the present invention provides a charge and discharge control method for parallel double battery packs, which is applied to a charge and discharge control system, wherein the charge and discharge control system comprises a first battery pack, a high voltage distribution box, a bidirectional DCDC, a second battery pack and a charging module assembly, the first battery pack, the high voltage distribution box, the bidirectional DCDC and the second battery pack are electrically connected in sequence, and the charging module assembly is electrically connected with the high voltage distribution box;
the method comprises the following steps:
when a traveling crane is powered on, if the first battery pack has no fault and the state of the whole vehicle is normal, the first battery pack is powered on, otherwise, the first battery pack is not powered on;
if the conditions that the first battery pack is successfully charged, the allowable charging power is larger than the preset power threshold value, the second battery pack has no fault, and the residual electric quantity is within the preset electric quantity threshold value range are met, the second battery pack outputs power supply;
if the output power of the second battery pack is larger than the power required by the electric appliances of the whole vehicle, the converted output of the second battery pack is used for supplying power and charging the first battery pack;
if the output power of the second battery pack is smaller than the power required by the electric appliances of the whole vehicle, the output of the first battery pack and the converted output of the second battery pack are used for supplying power together;
and if any one or more of the output power supply conditions of the second battery pack are not met, enabling the first battery pack to carry out independent output power supply.
Optionally, in the driving and power-on process, the method for controlling charging and discharging of the parallel double battery packs further includes:
if the second battery pack or the bidirectional DCDC has a fault but the whole vehicle has no high-voltage power-down fault, the second battery pack is powered down directly, and the bidirectional DCDC enters a standby state.
Optionally, the charge and discharge control method for the parallel double battery packs further includes:
when the vehicle is powered off, the second battery pack is powered off and whether the power off is successful is judged;
if so, continuing to power down the first battery pack;
if not, the first battery pack is powered off after the time is out.
Optionally, the charge and discharge control method for the parallel double battery packs further includes:
when charging and electrifying, if the first battery pack has no fault and the whole vehicle meets the charging condition, electrifying the first battery pack, otherwise, not electrifying the first battery pack.
Optionally, after the charging is powered on, the method further includes:
if the conditions that the first battery pack is successfully electrified and the second battery pack is faultless and the charging voltage and the charging current output by the charging equipment are respectively greater than the respective preset threshold values are met, electrifying the second battery pack to simultaneously charge the first battery pack and the second battery pack;
and if the condition is not met, independently charging the first battery pack.
Optionally, the charge and discharge control method for the parallel double battery packs further includes:
and if the charging of the second battery pack is finished, directly powering down the second battery pack.
Optionally, after the charging is completed, the method further comprises:
if the first battery pack is charged first, the second battery pack is powered off, if the second battery pack is powered off successfully, the first battery pack is powered off, and otherwise, the first battery pack is powered off after time out.
Optionally, the charge and discharge control method for the parallel double battery packs further includes:
and regulating and controlling the voltages of the first battery pack and the second battery pack by using a bidirectional Direct Current (DCDC) converter.
In addition, to achieve the above object, the present invention also provides a charge and discharge control apparatus for parallel-connected dual battery packs, comprising: first battery package, high voltage distribution box, two-way DCDC, second battery package, the module assembly that charges, memory, treater and storage are in on the memory and can be in the charge-discharge control procedure of the parallelly connected double cell package of operation on the treater, first battery package, high voltage distribution box, two-way DCDC and second battery package electric connection in proper order, the module assembly that charges and high voltage distribution box electric connection, the charge-discharge control procedure of parallelly connected double cell package is realized like the step of the charge-discharge control method of the parallelly connected double cell package as above when being executed by the treater.
In addition, to achieve the above object, the present invention also provides a computer readable storage medium having stored thereon a charge and discharge control program for parallel dual battery packs, the charge and discharge control program for parallel dual battery packs implementing the steps of the charge and discharge control method for parallel dual battery packs as described above when being executed by a processor.
According to the charge-discharge control method, the charge-discharge control equipment and the computer readable storage medium for the parallel double battery packs provided by the embodiment of the invention, the bidirectional DC-DC converter is used as a power supply control circuit to adjust the voltages of the parallel battery packs with different voltage platforms, so that the unequal charge-discharge process of the voltages of the parallel double battery packs is effectively controlled, and the corresponding charge-discharge strategies are used in application scenes including but not limited to vehicle driving power-on, vehicle driving power-off, charging power-on and charging completion, so that the endurance can be improved on the premise of guaranteeing the dynamic property, the economical efficiency and the driving property, the insufficient charge-discharge caused by different voltages is solved, the heat is reduced, and the problem of how to reasonably control the charge-discharge of the battery packs is solved.
Drawings
Fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a charging and discharging control method for parallel double battery packs according to an embodiment of the present invention;
fig. 3 is a schematic connection diagram of the charge and discharge control device for parallel connection of the dual battery packs according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
As shown in fig. 1, fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention.
The terminal of the embodiment of the invention can be a PC, and can also be a mobile terminal device with a display function, such as a smart phone, a tablet computer, an electronic book reader, a portable computer and the like.
As shown in fig. 1, the terminal may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Optionally, the terminal may further include a camera, a Radio Frequency (RF) circuit, a sensor, an audio circuit, a WiFi module, and the like. Such as light sensors, motion sensors, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display screen according to the brightness of ambient light, and a proximity sensor that may turn off the display screen and/or the backlight when the mobile terminal is moved to the ear. As one of the motion sensors, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally, three axes), detect the magnitude and direction of gravity when the mobile terminal is stationary, and can be used for applications (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer and tapping) and the like for recognizing the attitude of the mobile terminal; of course, the mobile terminal may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which are not described herein again.
Those skilled in the art will appreciate that the terminal structure shown in fig. 1 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a charge and discharge control program of the parallel dual battery pack.
In the terminal shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call the charge and discharge control program of the parallel dual battery pack stored in the memory 1005, and perform the following operations:
when a traveling crane is powered on, if the first battery pack has no fault and the state of the whole vehicle is normal, the first battery pack is powered on, otherwise, the first battery pack is not powered on;
if the conditions that the first battery pack is successfully charged, the allowable charging power is larger than the preset power threshold value, the second battery pack has no fault, and the residual electric quantity is within the preset electric quantity threshold value range are met, the second battery pack outputs power supply;
if the output power of the second battery pack is larger than the power required by the electric appliances of the whole vehicle, the converted output of the second battery pack is used for supplying power and charging the first battery pack;
if the output power of the second battery pack is smaller than the power required by the electric appliances of the whole vehicle, the output of the first battery pack and the converted output of the second battery pack are used for supplying power together;
and if any one or more of the output power supply conditions of the second battery pack are not met, enabling the first battery pack to carry out independent output power supply.
Further, the processor 1001 may call the dual-battery-pack charging and discharging control program stored in the memory 1005, and also perform the following operations:
if the second battery pack or the bidirectional DCDC has a fault but the whole vehicle has no high-voltage power-down fault, the second battery pack is powered down directly, and the bidirectional DCDC enters a standby state.
Further, the processor 1001 may call the dual-battery-pack charging and discharging control program stored in the memory 1005, and also perform the following operations:
when the vehicle is powered off, the second battery pack is powered off and whether the power off is successful is judged;
if so, continuing to power down the first battery pack;
if not, the first battery pack is powered off after the time is out.
Further, the processor 1001 may call the dual-battery-pack charging and discharging control program stored in the memory 1005, and also perform the following operations:
when charging and electrifying, if the first battery pack has no fault and the whole vehicle meets the charging condition, electrifying the first battery pack, otherwise, not electrifying the first battery pack.
Further, the processor 1001 may call the dual-battery-pack charging and discharging control program stored in the memory 1005, and also perform the following operations:
if the conditions that the first battery pack is successfully electrified and the second battery pack is faultless and the charging voltage and the charging current output by the charging equipment are respectively greater than the respective preset threshold values are met, electrifying the second battery pack to simultaneously charge the first battery pack and the second battery pack;
and if the condition is not met, independently charging the first battery pack.
Further, the processor 1001 may call the dual-battery-pack charging and discharging control program stored in the memory 1005, and also perform the following operations:
and if the charging of the second battery pack is finished, directly powering down the second battery pack.
Further, the processor 1001 may call the dual-battery-pack charging and discharging control program stored in the memory 1005, and also perform the following operations:
if the first battery pack is charged first, the second battery pack is powered off, if the second battery pack is powered off successfully, the first battery pack is powered off, and otherwise, the first battery pack is powered off after time out.
Further, the processor 1001 may call the dual-battery-pack charging and discharging control program stored in the memory 1005, and also perform the following operations:
and regulating and controlling the voltages of the first battery pack and the second battery pack by using a bidirectional Direct Current (DCDC) converter.
Referring to fig. 2, in an embodiment of the charge and discharge control method for the parallel double battery packs of the present invention, the charge and discharge control method for the parallel double battery packs is applied to a charge and discharge control system, the charge and discharge control system includes a first battery pack, a high voltage distribution box, a bidirectional DCDC, a second battery pack, and a charging module assembly, the first battery pack, the high voltage distribution box, the bidirectional DCDC, and the second battery pack are sequentially electrically connected, and the charging module assembly is electrically connected to the high voltage distribution box;
the step of powering up the travelling crane comprises:
step S10, when the vehicle is powered on, if the first battery pack is not faulty and the vehicle state is normal, the first battery pack is powered on, otherwise, the first battery pack is not powered on.
When the electric vehicle starts, the whole vehicle is powered on at low voltage in an initialization stage, namely, the battery pack is connected with a channel to form a power supply loop. After low-voltage electrification, whether the first battery pack has no fault, the whole vehicle has no power-on forbidding fault, the electric vehicle is normal in gear, the electric vehicle is normal in braking state and the charging gun is normal in connection state is judged. In an embodiment of the present invention, after low-voltage power-ON, if the first battery pack has no fault, the entire vehicle has no power-ON prohibition fault, the electric vehicle is in an ON gear, the brake pedal is pressed, and the charging gun is not connected to the electric vehicle, the first battery pack is powered ON; if any one or more of the conditions is not met, the first battery pack is not powered up. Therefore, the precondition that the first battery pack is electrified is that the first battery pack is not faulty and the whole vehicle is in a normal state, so that the success and the safety of electrifying the first battery pack are ensured. In the embodiment of the invention, the judgment conditions for judging whether the fault type of the first battery pack and the state of the whole vehicle are normal are not limited.
Step S20, if the conditions that the first battery pack successfully powers up and the allowed charging power is greater than the preset power threshold, the second battery pack has no fault and the remaining power is within the preset power threshold range are met, the second battery pack outputs power.
In the embodiment of the invention, the first battery pack is a high-voltage main battery pack, the second battery pack is a low-voltage auxiliary battery pack, the two battery packs belong to different voltage platforms and are connected in parallel, and the voltages of the two battery packs are regulated through the bidirectional DCDC module. After the first battery pack is powered on, if the first battery pack is not powered on successfully, the first battery pack is reconnected and powered on again; or if the power-on is unsuccessful, alarming; or if the first battery pack is not powered up after the power-up time threshold is preset, the first battery pack is reconnected and powered up again; or the first battery pack is not powered on after the power-on time threshold is preset, and then an alarm is given. In the embodiment of the present invention, the method for successfully powering up the first battery pack after the power-up operation is performed on the first battery pack is not limited. After the first battery pack is successfully and safely powered on, whether the charging power allowed to be received by the first battery pack is greater than a preset power threshold value, whether the second battery pack is faultless, whether the residual electric quantity of the second battery pack is within a preset electric quantity threshold value range, and whether the bidirectional DCDC module is faultless, is further judged. In an embodiment of the present invention, if the conditions that the first battery pack is successfully powered up and the acceptable charging power is greater than the preset power threshold, the second battery pack has no fault, the remaining power is within the preset power threshold, and the bidirectional DCDC module has no fault are met, the second battery pack is powered up and output for power supply, the bidirectional DCDC module enters a discharging state, and the second battery pack is output at a constant current in response to a discharging current request sent by the second battery pack. In the embodiment of the invention, the output power supply condition of the second battery pack is not limited so as to ensure the success and safety of the power-on of the second battery pack.
And step S30, if the output power of the second battery pack is greater than the power required by the electric appliance of the whole vehicle, the converted output of the second battery pack is used for supplying power and charging the first battery pack.
When the vehicle is powered on, when the first battery pack and the second battery pack both meet respective power-on conditions, and after the first battery pack and the second battery pack are added into a power supply loop, the output power of the second battery pack and the power required by electric appliances of the whole vehicle are judged. If the output power of the second battery pack is greater than the power required by the electric appliance of the whole vehicle, the fact that the second battery pack supplies power independently at the moment is also enough to bear the power consumption of the whole vehicle, the output of the second battery pack after the conversion of the bidirectional DCDC module is used for supplying power independently, in addition, the surplus power except the power consumption of the whole vehicle is charged additionally to the first battery pack, so that the output efficiency of the second battery pack is maximized, and the reduction of the electric quantity caused by the discharge loss is reduced as much as possible.
And step S40, if the output power of the second battery pack is smaller than the power required by the electric appliance of the whole vehicle, the output of the first battery pack and the converted output of the second battery pack are used for supplying power together.
When the vehicle is powered on, when the first battery pack and the second battery pack both meet respective power-on conditions, and after the first battery pack and the second battery pack are added into a power supply loop, the output power of the second battery pack and the power required by electric appliances of the whole vehicle are judged. If the output power of the second battery pack is smaller than the power required by the electric appliance of the whole vehicle, it indicates that the power supply by the second battery pack alone is not enough to bear the power of the electric appliance of the whole vehicle, the output of the first battery pack needs to be supplemented with the notch power which is not enough to bear the power required by the electric appliance of the whole vehicle and is output by the second battery pack alone, namely the supplemented output of the first battery pack and the output of the second battery pack after being converted by the bidirectional DCDC module are used for supplying power together.
And step S50, if any one or more of the output power supply conditions of the second battery pack are not met, enabling the first battery pack to carry out single output power supply.
After the first battery pack is successfully and safely powered on, it is further required to determine whether the charging power allowed to be received by the first battery pack is greater than a preset power threshold, whether the second battery pack has no fault, and whether the remaining power of the second battery pack is within a preset power threshold range. If any one or more conditions are not met, the situation that the second battery pack cannot be successfully and safely powered up is indicated, and the first battery pack is directly and independently used for supplying power to meet the power utilization requirement of the whole vehicle. Similarly, after the second battery pack is powered on, if the second battery pack is not powered on successfully, the second battery pack is reconnected and powered on again; or if the power-on is unsuccessful, alarming; or if the second battery pack is not powered up after the power-up time threshold is preset, the second battery pack is reconnected and powered up again; or the second battery pack is not powered on after the power-on time threshold is preset, and then an alarm is given. In the embodiment of the present invention, the method for successfully powering up the second battery pack after the second battery pack is powered up is not limited.
Optionally, in the process of powering on the traveling crane, the method for controlling charging and discharging of the parallel double battery packs further includes:
if the second battery pack or the bidirectional DCDC has a fault but the whole vehicle has no high-voltage power-down fault, the second battery pack is powered down directly, and the bidirectional DCDC enters a standby state.
In an embodiment of the present invention, in the power-on process of the driving, when the first battery pack and the second battery pack are both working, if the second battery pack has a fault but the first battery pack has no fault, the second battery pack is directly powered off, and the first battery pack is still working.
In this embodiment, first, whether a first battery pack during driving power-on meets a power-on condition is judged, and if yes, the first battery pack is powered on; and after the first battery pack is successfully electrified, judging whether the electrifying condition of the second battery pack is met or not, and electrifying the second battery pack if the electrifying condition of the second battery pack is met. After the first battery pack and the second battery pack are sequentially electrified and then are connected into a power supply loop, whether the output of the second battery pack after bidirectional DCDC voltage-boosting conversion meets the power consumption of the whole vehicle or not is judged, if yes, the second battery pack is used for independently outputting power supply, and if not, the first battery pack is used for supplementing a gap between the output of the second battery pack and the power consumption of the whole vehicle to supply power together. And if the second battery pack cannot be powered on, the first battery pack is used for supplying power independently. Therefore, in the embodiment of the invention, the bidirectional DCDC module is used for adjusting the first battery pack and the second battery pack, so that the full-power state of the first battery pack is satisfied as much as possible to obtain a longer driving range, and the economic performance of the electric automobile is improved while the driving power performance is ensured.
The invention provides a charge and discharge control method for parallel double battery packs, in one embodiment of the charge and discharge control method for parallel double battery packs, the step of powering off a vehicle comprises the following steps:
when the vehicle is powered off, the second battery pack is powered off and whether the power off is successful is judged;
if so, continuing to power down the first battery pack;
if not, the first battery pack is powered off after the time is out.
And (4) powering off the whole electric automobile, namely disconnecting the battery pack from the circuit to cut off the power supply loop. Before power-off processing, whether the gear of the vehicle is normal or not is judged, whether the whole vehicle has high voltage fault or whether the connection state of a charging gun is normal or not is judged. In an embodiment of the present invention, before performing the power-OFF process, if the electric vehicle is in an ACC (Adaptive Cruise Control) gear or an OFF gear, or the entire vehicle has a high-voltage power failure, or the charging gun is in a normal connection state, the power-OFF and bidirectional DCDC module of the second battery pack is first put into a standby state. Then judging whether the second battery pack is powered off successfully, and powering off the first battery pack if the second battery pack is powered off successfully; if the power-off fails, an overtime judgment is carried out, and the first battery pack is forcibly powered off after the time exceeds the preset time threshold value, so that the first battery pack is prevented from being incapable of being powered off normally due to faults.
In the embodiment of the invention, the adaptive setting is carried out on the condition of power off during driving, the second battery pack is powered off preferentially, and the power supply loop is disconnected, so that the second battery pack is not powered any more. After the second battery pack is powered off successfully, the first battery pack is powered off continuously, or after the power-off time of the second battery pack exceeds the limit, the first battery pack is powered off directly, so that larger unnecessary faults caused by faults of the second battery pack are avoided. When the second battery pack has a fault but the whole vehicle has no high-voltage power-down fault, the second battery pack is directly powered down and disconnected, the first battery pack continues to work, and the whole vehicle can still run normally.
In an embodiment of the method for controlling charging and discharging of the parallel dual battery pack of the present invention, the charging and powering up step includes:
when charging and electrifying, if the first battery pack has no fault and the whole vehicle meets the charging condition, electrifying the first battery pack, otherwise, not electrifying the first battery pack.
When the electric vehicle is charged, the whole vehicle is charged and electrified, namely, the battery pack is connected with the passage to form a charging loop. When charging and electrifying, whether the first battery pack has no fault and the whole vehicle has no charging forbidding fault and whether the whole vehicle meets normal charging conditions is judged. In one embodiment of the invention, when charging and electrifying, if the first battery pack has no fault, the whole vehicle has no charging forbidding fault and the whole vehicle meets the normal charging condition, the first battery pack is charged and electrified; and if any one or more conditions are not met, the first battery pack is not charged and powered up. In the embodiment of the invention, in order to ensure the safety of successful charging of the battery pack, the judgment condition for normal charging and electrifying of the first battery pack is not limited.
The step of charging and powering up further comprises:
if the conditions that the first battery pack is successfully electrified and the second battery pack is faultless and the charging voltage and the charging current output by the charging equipment are respectively greater than the respective preset threshold values are met, electrifying the second battery pack to simultaneously charge the first battery pack and the second battery pack;
and if the condition is not met, independently charging the first battery pack.
After the first battery pack is charged and electrified, if the charging and electrifying are unsuccessful, reconnection and electrifying are carried out; or if the power-on is unsuccessful, alarming; or if the first battery pack is not powered on after the charging power-on time threshold value is preset, the first battery pack is reconnected and powered on again; or the first battery pack is not powered on after the charging power-on time threshold value is preset, and then an alarm is given. In the embodiment of the present invention, the method for successfully powering up the first battery pack after performing the charging and powering-up operation on the first battery pack is not limited. After the first battery pack is charged and powered up safely and successfully, whether the second battery pack has no fault, whether the output charging voltage and the output charging current of the charger are greater than preset threshold values and whether the bidirectional DCDC module has no fault needs to be further judged. In an embodiment of the present invention, if the second battery pack is not faulty, the output charging voltage and the output charging current of the charger are greater than the preset threshold, and the bidirectional DCDC module is not faulty, the second battery pack is charged, the bidirectional DCDC module enters a charging state, and the first battery pack and the second battery pack are charged simultaneously in response to a charging current request sent by the second battery pack. In the embodiment of the invention, the charging condition of the second battery pack is not limited so as to ensure the success and safety of charging the second battery pack.
After the first battery pack is successfully and safely powered on, whether the second battery pack has no fault, whether the output charging voltage and the output charging current of the charger are greater than preset threshold values, and whether the bidirectional DCDC module has no fault need to be further judged. If any one or more conditions are not met, the second battery pack cannot be successfully and safely charged and electrified, and the first battery pack is independently charged. Similarly, after the second battery pack is charged and electrified, if the charging and electrifying are unsuccessful, the second battery pack is reconnected to charge and electrify again; or if the charging and electrifying are unsuccessful, alarming; or if the charging and electrifying time threshold of the second battery pack is preset and the charging and electrifying are not successful, reconnecting and carrying out the charging and electrifying again; or if the charging is not successfully charged after the preset charging time threshold value of the second battery pack, alarming. In the embodiment of the present invention, the method for recharging and powering up the second battery pack after the charging and powering up operation is performed on the second battery pack is not limited.
In the embodiment of the invention, whether a first battery pack meets charging and electrifying conditions is judged firstly when charging and electrifying, and if yes, the first battery pack is charged and electrified; and after the first battery pack is successfully charged and electrified, judging whether the charging and electrifying conditions of the second battery pack are met, and if so, charging and electrifying the second battery pack. After the first battery pack and the second battery pack are charged and electrified to be connected into the charging loop, the first battery pack and the second battery pack are charged simultaneously. And if the second battery pack cannot be charged and electrified, the first battery pack is charged independently. Therefore, in the embodiment of the invention, the bidirectional DCDC module is used for adjusting the first battery pack and the second battery pack, so that the charging state of the first battery pack is satisfied as much as possible to obtain a shorter charging time, and the electric quantity of the first battery pack and the second battery pack is fully charged as soon as possible under the condition that the requirement of safe charging is satisfied, thereby facilitating the use of the electric vehicle.
In an embodiment of the method for controlling charging and discharging of the parallel dual battery pack of the present invention, the step of completing charging includes:
and if the charging of the second battery pack is finished, directly powering down the second battery pack.
When the charging is finished, the electric automobile is charged and discharged, namely, the battery pack is disconnected to cut off a charging loop. When the second battery pack is charged to the SOC (State of Charge) of 100%, the second battery pack is directly charged and discharged, and the bidirectional DCDC module enters a standby State. In the charging strategy of the embodiment of the invention, the second battery pack is not separately connected to the loop but is calibrated to complete charging before the first battery pack in consideration of the small electric quantity of the second battery pack.
The step of completing charging further comprises:
if the first battery pack is charged first, the second battery pack is powered off, if the second battery pack is powered off successfully, the first battery pack is powered off, and otherwise, the first battery pack is powered off after time out.
However, in the charging strategy according to the embodiment of the present invention, because there is a possibility that the first battery pack and the second battery pack are charged and powered up simultaneously in step D, or there is a case that the first battery pack completes charging before the second battery pack, if the first battery pack completes charging first, the entire charging loop is disconnected, and at this time, the second battery pack is charged and powered down without considering the electric quantity of the second battery pack, and the bidirectional DCDC module enters the standby state. And then judging whether the second battery pack is successfully charged and discharged, and if the second battery pack is successfully charged and discharged, continuing to charge and discharge the first battery pack. If the first battery pack fails to be charged and discharged, an overtime judgment is made, and after the time exceeds a preset time threshold, the first battery pack is forcibly charged and discharged so as to avoid the situation that the first battery pack cannot be normally charged and discharged due to faults.
In the embodiment of the invention, the charging working conditions of the first battery pack and the second battery pack are optimized, the battery pack which is charged first is judged, the power is preferentially discharged, and the battery pack which is charged until the SOC is 100% is not charged any more and is discharged in time. When the high-efficient completion of province time charges, avoid because the battery package is connected the trouble that leads to on the charging circuit always, and then promote user's the experience of charging and experience with the car.
In an embodiment of the method for controlling charging and discharging of the parallel double battery packs of the present invention, the method for controlling charging and discharging of the parallel double battery packs further includes:
and regulating and controlling the voltages of the first battery pack and the second battery pack by using the bidirectional DCDC converter.
In an embodiment of the present invention, a bidirectional DCDC converter is used to realize bidirectional flow of dc power, and the bidirectional DCDC converter has a step-up and step-down bidirectional conversion function, so that when the bidirectional DCDC converter operates in a forward operation state, the battery pack can be efficiently charged, and when the bidirectional DCDC converter operates in a reverse operation state, the battery pack can be efficiently discharged. Under various working conditions of vehicle powering-on, vehicle powering-off, charging powering-on and charging completion, the bidirectional DCDC converter switches different states, including: a charging state, a discharging state, a standby state, a normal state without a fault, and the like.
In the embodiment of the invention, the first battery pack and the second battery pack are adjusted through the practical bidirectional DCDC converter, so that the energy consumption of charging and discharging on a resistor is avoided, the waste of energy is reduced, and the charging and discharging efficiency of the battery packs is reasonably improved. When charging, can shorten the latency of charging, when driving, can promote electric automobile's continuation of the journey mileage, improve drivability when the guarantee dynamic behavior.
In addition, an embodiment of the present invention further provides a charge and discharge control device for parallel dual battery packs, where the charge and discharge control device for parallel dual battery packs includes: first battery package, high voltage distribution box, two-way DCDC, second battery package, the module assembly that charges, memory, treater and storage are in on the memory and can be in the charge-discharge control procedure of the parallelly connected double cell package of operation on the treater, first battery package, high voltage distribution box, two-way DCDC and second battery package electric connection in proper order, the module assembly that charges and high voltage distribution box electric connection, the charge-discharge control procedure of parallelly connected double cell package is realized like the step of the charge-discharge control method of the parallelly connected double cell package as above when being executed by the treater. Referring to fig. 3, the charge and discharge control apparatus of the parallel dual battery pack includes a driving motor; the motor controller is connected with the motor; the output end of the first battery pack is connected with the input end of the motor controller, and the first battery pack is connected with the high-voltage distribution box; the second battery pack is connected with the high-voltage distribution box after passing through the bidirectional DCDC; and the bidirectional DCDC module is used for regulating the voltage output by the second battery pack to the electric appliance of the whole vehicle and the voltage input by the charging module assembly to the second battery pack. And the high-voltage distribution box is used for coordinating the function conversion and the energy distribution of high-voltage components such as the first battery pack, the bidirectional DCDC, the charging module assembly and the like. A charging module assembly comprises an on-board charger (OBC) module and a DCDC module. The first battery pack and the second battery pack are connected in parallel. The voltage platforms of the first battery pack and the second battery pack are different, and the bidirectional DCDC can adjust the voltages of the two battery packs.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a charge and discharge control program of the parallel dual battery pack is stored on the computer-readable storage medium, and when the charge and discharge control program of the parallel dual battery pack is executed by a processor, the steps of the charge and discharge control method of the parallel dual battery pack as described above are implemented.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The charge and discharge control method of the parallel double battery packs is characterized in that the charge and discharge control method of the parallel double battery packs is applied to a charge and discharge control system, the charge and discharge control system comprises a first battery pack, a high-voltage distribution box, a bidirectional DCDC, a second battery pack and a charging module assembly, the first battery pack, the high-voltage distribution box, the bidirectional DCDC and the second battery pack are sequentially electrically connected, and the charging module assembly is electrically connected with the high-voltage distribution box;
the method comprises the following steps:
when a traveling crane is powered on, if the first battery pack has no fault and the state of the whole vehicle is normal, the first battery pack is powered on, otherwise, the first battery pack is not powered on;
if the conditions that the first battery pack is successfully charged, the allowable charging power is larger than the preset power threshold value, the second battery pack has no fault, and the residual electric quantity is within the preset electric quantity threshold value range are met, the second battery pack outputs power supply;
if the output power of the second battery pack is larger than the power required by the electric appliances of the whole vehicle, the converted output of the second battery pack is used for supplying power and charging the first battery pack;
if the output power of the second battery pack is smaller than the power required by the electric appliances of the whole vehicle, the output of the first battery pack and the converted output of the second battery pack are used for supplying power together;
and if any one or more of the output power supply conditions of the second battery pack are not met, enabling the first battery pack to carry out independent output power supply.
2. The method for controlling charging and discharging of the parallel dual battery packs according to claim 1, wherein during a driving power-up process, the method for controlling charging and discharging of the parallel dual battery packs further comprises:
if the second battery pack or the bidirectional DCDC has a fault but the whole vehicle has no high-voltage power-down fault, the second battery pack is powered down directly, and the bidirectional DCDC enters a standby state.
3. The method for controlling charging and discharging of the parallel dual battery packs according to claim 1, further comprising:
when the vehicle is powered off, the second battery pack is powered off and whether the power off is successful is judged;
if so, continuing to power down the first battery pack;
if not, the first battery pack is powered off after the time is out.
4. The method for controlling charging and discharging of the parallel dual battery packs according to claim 1, further comprising:
when charging and electrifying, if the first battery pack has no fault and the whole vehicle meets the charging condition, electrifying the first battery pack, otherwise, not electrifying the first battery pack.
5. The method for controlling charging and discharging of the parallel dual battery packs according to claim 4, wherein after charging power up, the method further comprises:
if the conditions that the first battery pack is successfully electrified and the second battery pack is faultless and the charging voltage and the charging current output by the charging equipment are respectively greater than the respective preset threshold values are met, electrifying the second battery pack to simultaneously charge the first battery pack and the second battery pack;
and if the condition is not met, independently charging the first battery pack.
6. The method for controlling charging and discharging of the parallel dual battery packs according to claim 1, further comprising:
and if the charging of the second battery pack is finished, directly powering down the second battery pack.
7. The method for controlling charging and discharging of the parallel dual battery packs according to claim 6, wherein after the charging is completed, the method further comprises:
if the first battery pack is charged first, the second battery pack is powered off, if the second battery pack is powered off successfully, the first battery pack is powered off, and otherwise, the first battery pack is powered off after time out.
8. The charge and discharge control method of the parallel bicell package of any one of claims 1 to 7, wherein the charge and discharge control method of the parallel bicell package further comprises:
and regulating and controlling the voltages of the first battery pack and the second battery pack by using the bidirectional DCDC converter.
9. A charge and discharge control apparatus of parallel-connected dual battery packs, comprising: the charging and discharging control method comprises a first battery pack, a high-voltage distribution box, a bidirectional DCDC, a second battery pack, a charging module assembly, a memory, a processor and a charging and discharging control program, wherein the charging and discharging control program is stored in the memory and can run on the processor, the first battery pack, the high-voltage distribution box, the bidirectional DCDC and the second battery pack are electrically connected in sequence, the charging module assembly is electrically connected with the high-voltage distribution box, and the charging and discharging control program of the parallel double battery packs is executed by the processor to realize the steps of the charging and discharging control method of the parallel double battery packs according to any one of claims 1 to 8.
10. A computer-readable storage medium, wherein a charge and discharge control program of parallel dual battery packs is stored on the computer-readable storage medium, and when executed by a processor, the charge and discharge control program of parallel dual battery packs implements the steps of the charge and discharge control method of parallel dual battery packs according to any one of claims 1 to 8.
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