CN111525656B - Battery electric energy feedback system and vehicle - Google Patents
Battery electric energy feedback system and vehicle Download PDFInfo
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- CN111525656B CN111525656B CN202010492568.5A CN202010492568A CN111525656B CN 111525656 B CN111525656 B CN 111525656B CN 202010492568 A CN202010492568 A CN 202010492568A CN 111525656 B CN111525656 B CN 111525656B
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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
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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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
- H02J7/007—Regulation of charging or discharging current or voltage
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The embodiment of the invention discloses a battery electric energy feedback system and a vehicle, wherein the anode of a battery is respectively connected with a first voltage detection end of an ECU controller, a first end of a first control switch and the anode of a diode; the negative electrode of the battery is connected with a second voltage detection end of the ECU controller and an electric energy supply feedback device used for connecting the motor; the second end of the first control switch and the cathode of the diode are used for being connected with an electric energy supply feedback device; the control end of the first control switch is connected with the control end corresponding to the ECU controller; the ECU controller is used for switching off the first control switch to prevent the electric energy from being supplied to the feedback device to feed back current to the battery through the diode when the ECU controller determines that the residual capacity of the battery is larger than or equal to the preset capacity and receives a braking signal according to the voltages of the battery detected by the first voltage detection end and the second voltage detection end. The invention can prevent the overcharge risk of the battery.
Description
Technical Field
The invention relates to the technical field of battery charging and discharging control, in particular to a battery electric energy feedback system and a vehicle.
Background
Most of the existing electric locomotives can feed back the energy generated in the braking process of the motor and input into the frequency converter to a power grid or other energy storage devices, so that the regenerative electric energy can be recycled while the effective braking of the frequency converter is met. However, most of the feedback systems of the electric locomotives in the conventional technology are complex, and in order to avoid the overcharge risk caused by the feedback of the battery when the battery voltage is too high, the battery system can only be left to be not fully charged and reserve certain electric quantity when being charged, and if the feedback reaches the overcharge limit condition, the battery system actively cuts off the output of the battery, so that the battery system is prevented from generating higher safety risk. Therefore, the feedback system of the electric locomotive in the conventional technology is inconvenient to use and is not suitable for most electric locomotives.
Disclosure of Invention
The invention aims to provide a battery electric energy feedback system and a vehicle aiming at the defects in the prior art.
In one embodiment, the present invention provides a battery power feedback system, comprising: the device comprises a battery, an ECU controller, a first control switch and a diode;
the positive electrode of the battery is respectively connected with a first voltage detection end of the ECU controller, a first end of the first control switch and the positive electrode of the diode; the negative electrode of the battery is connected with a second voltage detection end of the ECU controller and an electric energy supply feedback device used for connecting the motor; the second end of the first control switch and the cathode of the diode are used for being connected with an electric energy supply feedback device; the control end of the first control switch is connected with the control end corresponding to the ECU controller;
the ECU controller is used for switching off the first control switch to prevent the electric energy from being supplied to the feedback device to feed back current to the battery through the diode when the ECU controller determines that the residual capacity of the battery is larger than or equal to the preset capacity and receives a braking signal according to the voltages of the battery detected by the first voltage detection end and the second voltage detection end.
In one embodiment, the device further comprises a second control switch; the first end of the second control switch is connected with the anode of the battery, the second end of the second control switch is connected with the anode of the diode, and the control end of the second control switch is connected with the control end corresponding to the ECU controller;
the first control switch is switched off to prevent the electric energy from being supplied to the feedback current of the feedback device flowing to the battery through the diode, and the method comprises the following steps:
the first control switch is turned off and the second control switch is turned on to prevent the electric energy from being supplied to the feedback current of the feedback device to the battery through the diode.
In one embodiment, the device further comprises a current limiting circuit and a current sensor;
the current limiting circuit comprises a plurality of groups of current limiting units; the first end of each current-limiting unit is connected with the anode of the battery, the control end of each current-limiting unit is connected with the corresponding control end of the ECU controller, and the second end of each current-limiting unit is used for being connected with the electric energy supply feedback device;
the current sensor is connected with the ECU controller and is used for collecting feedback current and collecting discharge current flowing from the battery to the electric energy supply feedback device;
the ECU controller is also used for disconnecting the first control switch and conducting a corresponding number of current limiting units according to the current voltage of the battery if the current feedback current is larger than the maximum allowable feedback current of the battery when the residual capacity of the battery is smaller than the preset capacity and the braking signal is received.
In one embodiment, when the remaining capacity of the battery is smaller than the preset capacity and the braking signal is received, if the current feedback current is larger than the maximum allowable feedback current of the battery, the first control switch is turned off, and a corresponding number of current limiting units are turned on according to the current voltage of the battery, and then the method includes:
and the ECU controls to switch on the second control switch, keeps the first control switch off and the second control switch on if the current discharging current of the battery is less than the preset discharging current when the braking signal is not received any more, and switches off the current limiting unit until the current discharging current is greater than or equal to the preset discharging current, and switches on the first control switch and switches off the second control switch.
In one embodiment, the turning off of the first control switch and the turning on of the second control switch prevents the electric energy from supplying the feedback current to the battery from the feedback device through the diode, and then comprises:
when the ECU controller does not receive the braking signal any more, if the current discharging current of the battery is smaller than the preset discharging current, the first control switch is kept off and the second control switch is kept on until the current discharging current is larger than or equal to the preset discharging current, the first control switch is switched on and the second control switch is switched off.
In one embodiment, the third voltage detection end of the ECU controller is used for being connected to the electric energy supply feedback device;
the ECU controller is further used for determining a current capacitance value of the capacitor according to the current voltage of the capacitor in the electric energy supply feedback device detected by the second voltage detection end and the third voltage detection end in the initial power-on state, determining the pre-charging time of the electric energy supply feedback device according to the capacitance difference value between the current capacitance value of the capacitor and the preset capacitance value, determining and conducting a corresponding number of current limiting units in the current limiting circuit according to the pre-charging time and the capacitance difference value, so as to charge the capacitor in the electric energy supply feedback device, and switching off the current limiting unit and switching on the first control switch until the current voltage of the capacitor reaches the preset voltage value.
In one embodiment, the current limiting unit includes a third control switch and a current limiting resistor;
the first end of the third control switch is used as the first end of the current limiting unit, the control end of the third control switch is used as the control end of the current limiting unit, and the second end of the third control switch is connected with one end of the current limiting resistor; the other end of the current limiting resistor is used as the second end of the current limiting unit.
In one embodiment, the system further comprises an electric energy supply feedback device.
In one embodiment, the first control switch is a first relay;
one end of a switch contact of the first relay is used as a first end of the first control switch, the other end of the switch contact of the first relay is used as a second end of the first control switch, one end of a coil of the first relay is used as a control end of the first control switch, and the other end of the coil of the first relay is grounded.
In one embodiment, the invention also provides a vehicle including a battery power feedback system.
The invention provides a battery electric energy feedback system and a vehicle, which have the following technical effects:
the invention provides a battery electric energy feedback system and a vehicle. When the ECU controller receives the braking signal and the residual capacity of the battery is greater than or equal to the preset capacity, the first control switch is disconnected so as to cut off the normal main loop of the actual feedback current, and the feedback current is prevented from flowing to the battery by utilizing the unidirectional conduction performance of the diode. The circuit of each embodiment of the invention has simple structure and lower cost, can ensure that the battery can fully exert the discharge energy and the endurance capacity of the battery, prevent the overcharge risk of the battery and prevent the power failure phenomenon of the motor caused by the overcharge of the battery in the working process.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
FIG. 1 is a schematic diagram of a battery power feedback system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another exemplary embodiment of a battery power feedback system;
FIG. 3 is a schematic diagram of another exemplary embodiment of a battery power feedback system;
FIG. 4 is a schematic diagram of another exemplary embodiment of a battery power feedback system;
FIG. 5 is a graph illustrating the linear relationship between the pre-charge time and the pre-charge voltage in a battery feedback system according to an embodiment of the present invention;
fig. 6 shows a schematic configuration of a vehicle in one embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Referring to fig. 1, in one embodiment, the present invention provides a battery energy feedback system, comprising: battery 110, ECU controller 120, first control switch K1, and diode D1.
The positive electrode of the battery 110 is connected to the first voltage detection terminal of the ECU controller 120, the first control switch K1 and the positive electrode of the diode D1, respectively; the negative pole of the battery 110 is connected with the second voltage detection end of the ECU controller 120 and is used for being connected with the electric energy supply feedback device 130 of the motor; the second end of the first control switch K1 and the cathode of the diode D1 are used for connecting the electric energy supply feedback device 130; a control terminal of the first control switch K1 is connected to a corresponding control terminal of the ECU controller 120.
The ECU controller 120 is configured to open the first control switch K1 to prevent the feedback current flowing to the battery from the electric power feedback device 130 through the diode D1 when it is determined that the remaining capacity of the battery 110 is greater than or equal to the preset capacity and the braking signal is received according to the voltage of the battery 110 detected by the first voltage detecting terminal and the second voltage detecting terminal.
In the embodiment of the invention, the battery power feedback system is a battery hardware system packaged in a battery pack, and the first control switch K1 may be a relay or a contactor. The power supply feedback device 130 includes a power feedback unit and further includes a frequency converter or a motor controller for supplying power to the motor and feeding the power generated by the motor during braking, which is input to the frequency converter or the motor controller, back to the battery 110.
When the remaining capacity of the battery is greater than or equal to the preset capacity but no braking signal is received, i.e., the motor is not braked but is in a stable normal operation state, the ECU controller 120 controls the first control switch K1 to keep a closed state, and the battery 110 discharges electricity to the electric power supply feedback device 130 through the first control switch K1 and the diode D1, so that the electric power supply feedback device 130 supplies electricity to the motor. When the remaining capacity of the battery 110 is greater than or equal to the predetermined capacity and the braking signal is received, i.e., the motor is braking, the first control switch K1 is turned off to prevent the feedback current flowing to the battery 110 from the feedback device 130 from being supplied by the motor during the braking process through the diode D1. Thus, the one-way conduction of the diode D1 prevents the feedback current from flowing to the battery 110, and the function of prohibiting the feedback of the electric energy is performed. When the ECU controller 120 receives the braking signal but the remaining capacity of the battery 110 is less than the predetermined capacity, the first control switch K1 is kept closed, so that the feedback current of the electric power supply feedback device 130 can be charged to the battery 110 through the main loop of the first control switch K1 during the motor braking process. The ECU controller 120 detects voltages across the battery 110 through the first voltage detection terminal and the second voltage detection terminal, and obtains the remaining capacity of the battery 110 according to the voltages across the battery 110. Further, the cathode of the diode D1 and the second terminal of the first control switch K1 are used for connecting the anode of the power supply feedback device 130, and the cathode of the battery 110 is connected to the cathode of the power supply feedback device 130.
The embodiment of the invention can enable the battery electric energy feedback system to be in interactive communication with the motor through the ECU controller 120, so that the battery electric energy feedback system can be adjusted and controlled by combining the actual magnitude of the electric energy which can be fed back by the battery, and the risk of overcharging the battery 110 is prevented.
The battery power feedback system provided by the invention comprises a battery 110, an ECU controller 120, a first control switch K1 and a diode D1. When the ECU controller 120 receives the braking signal and the remaining capacity of the battery 110 is greater than or equal to the preset capacity, the first control switch K1 is turned off to cut off the normal main loop of the feedback current to block the feedback current from flowing to the battery 110 by using the unidirectional conduction performance of the diode D1. The circuit of the embodiment of the invention has simple structure and lower cost, can ensure that the battery 110 can fully exert the discharge energy and the endurance capacity of the battery, prevent the overcharge risk of the battery and prevent the power failure phenomenon of the load caused by the overcharge of the battery in the working process.
Referring to fig. 2, in a specific embodiment, a second control switch K2 is further included; a first end of the second control switch K2 is connected to the positive electrode of the battery 110, a second end of the second control switch K2 is connected to the positive electrode of the diode D1, and a control end of the second control switch K1 is connected to a corresponding control end of the ECU controller 120.
The first control switch K1 is turned off to stop the feedback current from the feedback device 130 to the battery 110 through the diode D1, and includes:
the first control switch K1 is turned off and the second control switch K2 is turned on to prevent the electric energy from being supplied to the feedback device 130 to feed back the electric current to the battery 110 through the diode D1.
In the embodiment of the present invention, the second control switch K2 may be a relay or a contactor. When the remaining capacity of the battery is greater than or equal to the preset capacity but the braking signal is not received, the first control switch K1 is controlled to be kept in a closed state, and the second control switch K2 is controlled to be kept in an open state, so that the battery 110 discharges electricity to the electric energy supply feedback device 130 through the first control switch K1, and the electric energy supply feedback device 130 supplies electricity to the motor. When the remaining capacity of the battery 110 is greater than or equal to the predetermined capacity and the braking signal is received, i.e. the motor is braking, the first control switch K1 is turned off and the second control switch K2 is turned on, so as to prevent the feedback current flowing to the battery 110 from the feedback device 130 during the braking process of the motor from being supplied by the electric energy through the diode D1, thereby playing the role of prohibiting the feedback of the electric energy. When the ECU controller 120 receives the braking signal but the remaining capacity of the battery 110 is less than the predetermined capacity, the first control switch K1 is kept closed, and the second control switch K2 is kept open, so that the feedback current of the electric power supply feedback device 130 can be charged to the battery 110 through the main loop of the first control switch K1 during the motor braking process.
According to the battery electric energy feedback system provided by the embodiment of the invention, when the motor runs stably and is not braked or when the residual capacity of the battery is smaller than the preset capacity when the motor is braked, the second control switch K2 is controlled to be switched off, and normal discharge or electric energy feedback is carried out through the main loop of the first control switch K1, so that the energy consumption caused by discharge or electric energy feedback through other loops is reduced. When the remaining capacity of the battery is greater than or equal to the preset capacity during the braking of the motor, in order to prevent the overcharge of the battery, the first control switch K1 is turned off, and the second control switch K2 is turned on, so that the feedback of the electric energy is prevented by the diode D1 in the loop of the second control switch K2. The circuit of the embodiment of the invention has simple structure and easy realization, and can help to reduce discharge energy consumption.
Referring to fig. 3, in one particular embodiment, a current limiting circuit 150 is also included, as well as a current sensor 140.
The current limiting circuit 150 includes a plurality of sets of current limiting units 150 a; a first terminal of each current limiting unit 150a is connected to the positive electrode of the battery 110, a control terminal of the current limiting unit 150a is connected to a corresponding control terminal of the ECU controller 120, and a second terminal of the current limiting unit 150a is used for connecting the feedback device 130 for supplying electric energy.
The current sensor 140 is connected to the ECU controller 120 for collecting the feedback current and also for collecting the discharge current flowing from the battery 110 to the electric power supply feedback device 130.
The ECU controller 120 is further configured to turn off the first control switch K1 and turn on a corresponding number of current limiting units 150a according to the current voltage of the battery 110 if the current feedback current is greater than the maximum allowable feedback current of the battery 110 when the remaining capacity of the battery 110 is less than the predetermined capacity and the braking signal is received.
When the remaining capacity of the battery 110 is less than the preset capacity, it indicates that the electric energy feedback is possible, and at this time, when the ECU controller 120 receives the braking signal, if it is detected through the current sensor 140 that the current feedback current of the battery 110 is greater than the maximum allowable feedback current of the battery 110, the first control switch K1 is turned off, and a corresponding number of current limiting units 150a are turned on according to the current voltage of the battery 110. The feedback current is charged to the battery 110 through the current limiting unit 150a, and a part of the power is dissipated by the current limiting unit 150a to reduce the magnitude of the feedback current, so that the feedback current is smaller than the maximum allowable feedback current. Otherwise, the first control switch K1 is kept closed and the current limiting unit 150a is not switched in.
The voltage of the battery 110 varies due to the difference in the remaining capacity, and the maximum allowable feedback current varies from one battery to another. Therefore, the current limiting units 150a with corresponding number are connected according to the current voltage of the battery 110, so that the feedback current can be limited while the battery 110 is charged by the feedback current through the current limiting units 150a, and the feedback current is smaller than the maximum allowable feedback current, so as to limit the magnitude of the feedback current.
The battery electric energy feedback system of the embodiment of the invention has a more perfect circuit structure, the current limiting circuit 150 plays a role in limiting the magnitude of the feedback current, and the irreversible damage to the battery 110 caused by the overlarge feedback current can be prevented while the electric quantity generated when the motor is braked can be fed back to the battery 110.
Referring to fig. 3, further, the battery power feedback system of the embodiment of the invention further includes a temperature sensor 170 for collecting the temperature of the battery 110. Further, the ECU controller 120 may obtain the current temperature data of the battery 110 through the temperature sensor 170, and determine the current maximum allowable feedback current of the battery 110 according to the temperature data and the current voltage of the battery 110.
The battery electric quantity feedback system of the embodiment of the invention can accurately obtain the current maximum allowable feedback current of the battery 110, thereby further preventing the damage of the excessive feedback current to the battery 110 and avoiding the influence on the service life of the battery 110.
Referring to fig. 3, in an embodiment, when the remaining capacity of the battery 110 is less than the predetermined capacity and the braking signal is received, if the current feedback current is greater than the maximum allowable feedback current of the battery, the first control switch K1 is turned off, and a corresponding number of current limiting units 150a are turned on according to the current voltage of the battery 110, and then:
the ECU control 120 also turns on the second control switch K2, and when the braking signal is no longer received, keeps the first control switch K1 turned off and the second control switch K2 turned on if the current discharging current of the battery 110 is less than the preset discharging current, and turns off the current limiting unit 150a until the current discharging current is greater than or equal to the preset discharging current, turns on the first control switch K1 and turns off the second control switch K2.
In the battery power feedback system according to the embodiment of the present invention, when the remaining capacity of the battery 110 is smaller than the predetermined capacity and the ECU controller 120 receives the braking signal, if the current feedback current is larger than the maximum allowable feedback current, the first control switch K1 is turned off and the corresponding number of current limiting units 150a are turned on, and the second control switch K2 is also turned on to limit the feedback current. When the ECU controller 120 stops receiving the braking signal, which indicates that the motor stops braking, the electric energy feedback ends to enter the battery discharging state, and the discharging current of the battery 110 gradually increases as the motor 160 gradually enters the stable normal operation state after braking ends. If the current discharging current is smaller than the preset discharging current, the first control switch K1 is kept off and the second control switch K2 is kept on, and the current limiting unit 150a needs to be turned off to avoid the dissipation of the electric energy, so that the repeated execution of the braking and the ending of the braking of the motor 160 can be prevented, the first control switch K1 is repeatedly turned on and off to avoid the bad conditions of instability and the like caused to a circuit system, and the electric energy can be saved. Until the current discharging current is greater than or equal to the preset discharging current, which indicates that the motor 160 enters a stable normal operation state, the first control switch K1 is turned on and the second control switch K2 is turned off, so that the battery 110 can supply power to the motor 160 through the power supply feedback device 130 through the main loop of the first control switch K1.
The battery electric energy feedback system of the embodiment of the invention has a more perfect structure and can improve the response speed and reliability of the system.
Referring to fig. 3, in one embodiment, the turning off of the first control switch K1 and the turning on of the second control switch K2 prevents the feedback current of the electric power supplied from the feedback device 130 to the battery 110 through the diode D1, and then includes:
when the ECU controller 120 no longer receives the braking signal, if the current discharging current of the battery 110 is less than the preset discharging current, the first control switch K1 is kept off and the second control switch K2 is kept on until the current discharging current is greater than or equal to the preset discharging current, the first control switch K1 is turned on and the second control switch K2 is turned off.
In the battery power feedback system according to the embodiment of the present invention, if the ECU controller 120 no longer receives the braking signal, it indicates that the motor 160 stops braking, and when the motor 160 stops braking and enters a stable normal operation state, the battery 110 enters a discharge state and the discharge current gradually increases. If the ECU controller 120 no longer receives the braking signal, i.e., the load ends braking, when the electric energy feedback is prohibited and the discharging current of the battery 110 is smaller than the preset discharging current, the first control switch K1 is kept off and the second control switch K2 is kept on, so that the repeated execution of braking and ending of braking of the motor 160 can be prevented, and the first control switch K1 is repeatedly turned on and off to cause an unstable circuit system. Until the current discharging current is greater than or equal to the preset discharging current, which indicates that the motor 160 enters a stable normal operation state, the first control switch K1 is turned on and the second control switch K2 is turned off, so that the battery 110 can supply power to the motor 160 through the power supply feedback device 130 through the main loop of the first control switch K1.
The battery electric energy feedback system of the embodiment of the invention has a more perfect circuit structure and can improve the response speed and reliability of the system.
Referring to fig. 3, in one embodiment, the third voltage detection terminal of the ECU controller 120 is used to connect to the electric power supply feedback device 130.
The ECU controller 120 is further configured to determine a current capacitance value of the capacitor in the feedback device 130 according to the current voltage of the capacitor in the feedback device 130 detected by the second voltage detecting terminal and the third voltage detecting terminal in the initial power-on state, determine a pre-charging time for supplying the power to the feedback device 130 according to a capacitance difference between the current capacitance value of the capacitor and a preset capacitance value, determine and turn on a corresponding number of current limiting units 150a in the current limiting circuit 150 according to the pre-charging time and the capacitance difference, so as to charge the capacitor in the feedback device 130 for supplying the power, and turn off the current limiting unit 150a and turn on the first control switch K1 until the current voltage of the capacitor reaches the preset voltage value.
The current limiting unit 150a in the current limiting circuit 150 can limit current, and the larger the current limiting function is, the more current limiting units 150a are connected, and the larger the current limiting resistance is. The starting voltage of the motor of different devices before the motor is started to enter the normal operation state, i.e. the preset voltage value required by the capacitor in the electric energy supply feedback device 130 is different. The precharge voltage value of the electric energy supplied to the feedback device 130 is determined according to the capacitance difference value, and the precharge time is longer as the precharge voltage value is larger, and the precharge voltage value and the precharge time are in a linear relationship. Therefore, the pre-charging voltage value to the electric energy supply feedback device 130 can be determined according to the difference value between the current capacitance value and the preset capacitance value of the capacitor in the electric energy supply feedback device 130, and the pre-charging time can be further obtained. The determining mode can store a corresponding pre-charging time-pre-charging voltage value comparison table according to the type of the equipment, and the corresponding pre-charging time is inquired from the table. Further, the precharge resistance value is determined according to the precharge time and the capacitance difference, and then the corresponding number of current limiting units 150a in the current limiting circuit 150 is finally determined to be turned on. And the system is matched with a battery electric energy feedback system to meet the requirements of different equipment on the pre-charging time and the pre-charging voltage value under different conditions.
The battery power feedback system according to the embodiment of the invention can pre-charge the power supply feedback device 130 in the initial power-on state through the current limiting unit 150a to meet the starting requirement of the motor 160 in the equipment, and prevent the equipment from being damaged by excessive instantaneous current voltage at the initial power-on state. Meanwhile, the circuit of the embodiment of the invention has simple structure and lower cost, is beneficial to the stable operation of the motor 160 and has higher reliability.
Referring to fig. 4, in one embodiment, the current limiting unit includes a third control switch K3 and a current limiting resistor R1.
A first end of the third control switch K3 is used as a first end of the current limiting unit, a control end of the third control switch K3 is used as a control end of the current limiting unit, and a second end of the third control switch K3 is connected with one end of the current limiting resistor R1; the other end of the current limiting resistor R1 serves as a second end of the current limiting unit.
Wherein, the third control switch K3 can be a relay or a contactor. In the case of the relay, one end of the switch contact of the relay serves as a first end of the third control switch K3, the other end of the switch contact of the relay serves as a second end of the third control switch K3, one end of the coil of the relay serves as a control end of the third control switch K3, and the other end of the coil of the relay is grounded.
For example, determining and turning on a corresponding number of current limiting units in the current limiting circuit 150 according to the precharge time and the capacitance difference includes: the pre-charge resistance R coupled into the current limiting circuit 150 may be obtained according to the following equation:
T＝R△C×Ln10；
wherein, T represents the pre-charging time, R represents the pre-charging resistance value, and Delta C represents the capacitance difference value. After the precharge resistance value of the access current limiting circuit 150 is obtained, a corresponding number of current limiting units in the access current limiting circuit 150 may be turned on according to the precharge resistance value R, so as to turn on a corresponding number of third control switches K3, thereby accessing a corresponding number of current limiting resistors R1. In the initial power-on state, the capacitors in the power supply feedback device 130 can be charged by accessing the corresponding number of third control switches K3 and the corresponding number of current-limiting resistors R1, and when the current voltage of the capacitors in the power supply feedback device 130 reaches the preset voltage value, the third control switch K3 is turned off and the first control switch K1 is turned on, so that the motor 160 enters the normal operation state. The voltage of the capacitor in the feedback device 130 supplied with electric energy can be detected by the second voltage detection terminal and the third voltage detection terminal, so that the current capacitance value of the capacitor can be obtained according to the voltage.
The embodiment of the invention has smaller limitation and is flexible, and the electric energy supply feedback device 130 can be precharged in the initial power-on state through the third control switch K1 and the current-limiting resistor R1 so as to meet the starting requirement of the motor 160 in the equipment and prevent the equipment from being damaged by overlarge instantaneous current voltage during the initial power-on. Meanwhile, the circuit of the embodiment of the invention has simple structure and lower cost, is beneficial to the stable operation of the motor 160 and has higher reliability.
Specifically, referring to fig. 5, the precharge voltage corresponding to the precharge time t1 is V1, and the precharge voltage corresponding to the precharge time t2 is V2. The preset capacitance values required by different devices are different, the larger the capacitance difference value between the current capacitance value of the capacitor and the preset capacitance value is, the larger the corresponding pre-charging voltage value is, the longer the pre-charging time is, and the linear relationship between the pre-charging voltage value and the pre-charging time is. The relation among the pre-charging time T, the pre-charging resistance R and the capacitance difference value Delta C is as follows:
T＝R△C×Ln[(V1-V0)/(V1-V3)]
where V1 is the voltage when the battery is fully charged, V0 is the voltage at the motor terminal when the battery is not energized, and V3 is the voltage at the motor terminal when the precharge is completed. Due to the presence of the capacitor in the power supply feedback device 130, voltage may be present even at the non-energized motor side, but here V0 may take 0V. Further, for convenience of calculation and improved calculation efficiency, V3 is selected to be 90% of V1, and the above formula can be simplified as follows: t ═ R Δ C × Ln 10.
Referring to fig. 1, in one embodiment, an electrical energy supply feedback device 130 is further included.
The battery electric energy feedback system of the embodiment of the invention has a more perfect circuit structure, and the electric energy supply feedback device 130 is matched with the ECU controller 120, so that the battery 110 can be ensured to fully exert the discharge energy and the endurance capacity of the battery, the overcharge risk of the battery is prevented, and the power failure phenomenon of the motor caused by the overcharge of the battery in the working process can be prevented.
Referring to fig. 4, the first control switch K1 is a first relay.
One end of the switch contact of the first relay is used as the first end of the first control switch K1, the other end of the switch contact of the first relay is used as the second end of the first control switch K1, one end of the coil of the first relay is used as the control end of the first control switch K1, and the other end of the coil of the first relay is grounded.
In the battery electric energy feedback system of the embodiment of the invention, the ECU controller 120 controls the coil of the first relay to be electrified or deenergized so that the switch contact is attracted or separated to realize connection or disconnection, and the structure is simple and easy to realize. Therefore, the reliability of a circuit system can be improved, electric energy feedback and power supply stability are facilitated, and the motor can normally run.
Referring to fig. 4, further, the second control switch K2 is a second relay, one end of a switch contact of the second relay serves as a first end of the second control switch K2, the other end of the switch contact of the second relay serves as a second end of the second control switch K2, one end of a coil of the second relay serves as a control end of the second control switch K2, and the other end of the coil of the second relay is grounded.
Referring to fig. 3, in one particular embodiment, electric machine 160 is an electric machine of a pure electric vehicle, or an electric machine of a hybrid vehicle; a brake signal detection terminal IO of the ECU controller 120 is connected to a brake device.
The battery electric energy feedback system can quickly acquire the braking signal sent by the brake device so as to timely execute the feedback of the battery electric energy.
Referring to fig. 4, in the battery power feedback system according to the embodiment of the present invention, the battery 110 further includes a fuse FU, so as to protect the battery 110 from overvoltage and overcurrent.
Referring to fig. 6, in one embodiment, the present invention further provides a vehicle including a battery power feedback system 610.
It should be noted that, for the limitation description of the battery power feedback system 610 according to the embodiment of the present invention, reference may be made to the above limitation description of the battery power feedback system, and details are not repeated herein.
In a particular embodiment, the vehicle includes a pure electric vehicle as well as a hybrid vehicle.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (9)
1. A battery power feedback system, comprising: the device comprises a battery, an ECU controller, a first control switch and a diode;
the positive electrode of the battery is respectively connected with a first voltage detection end of the ECU controller, a first end of the first control switch and the positive electrode of the diode; the negative electrode of the battery is connected with a second voltage detection end of the ECU controller and an electric energy supply feedback device used for connecting the motor; the second end of the first control switch and the cathode of the diode are used for being connected with the electric energy supply feedback device; the control end of the first control switch is connected with the control end corresponding to the ECU controller;
the ECU controller is used for switching off the first control switch to prevent the feedback current of the electric energy supply feedback device from flowing to the battery through the diode when the ECU controller determines that the residual capacity of the battery is greater than or equal to the preset capacity and receives a braking signal according to the voltages of the battery detected by the first voltage detection end and the second voltage detection end;
the device also comprises a second control switch; the first end of the second control switch is connected with the anode of the battery, the second end of the second control switch is connected with the anode of the diode, and the control end of the second control switch is connected with the control end corresponding to the ECU controller;
the first control switch is turned off to prevent the feedback current of the electric energy supply feedback device flowing to the battery through the diode, and the method comprises the following steps:
the first control switch is turned off and the second control switch is turned on to prevent the electric energy from supplying the feedback current of the feedback device to the battery through the diode.
2. The battery power feedback system of claim 1 further comprising a current limiting circuit and a current sensor;
the current limiting circuit comprises a plurality of groups of current limiting units; the first end of each current limiting unit is connected with the anode of the battery, the control end of each current limiting unit is connected with the corresponding control end of the ECU controller, and the second end of each current limiting unit is used for being connected with the electric energy supply feedback device;
the current sensor is connected with the ECU controller and is used for collecting the feedback current and collecting the discharge current flowing from the battery to the electric energy supply feedback device;
the ECU controller is further configured to disconnect the first control switch and turn on a corresponding number of the current limiting units according to a current voltage of the battery if the current feedback current is greater than a maximum allowable feedback current of the battery when the remaining capacity of the battery is smaller than the preset capacity and the braking signal is received.
3. The system of claim 2, wherein when the remaining capacity of the battery is smaller than the predetermined capacity and the braking signal is received, if the current feedback current is larger than the maximum allowed feedback current of the battery, the first control switch is turned off and a corresponding number of the current limiting units are turned on according to the current voltage of the battery, and then the method comprises:
and the ECU controller is also connected with the second control switch, and when the braking signal is not received any more, if the current discharging current of the battery is less than the preset discharging current, the ECU controller keeps the first control switch disconnected and the second control switch connected, and disconnects the current limiting unit, until the current discharging current is greater than or equal to the preset discharging current, the ECU controller connects the first control switch and disconnects the second control switch.
4. The battery power feedback system of claim 2 wherein turning off the first control switch and turning on the second control switch prevents the power supply feedback device from feeding back current to the battery through the diode, and thereafter comprising:
when the ECU controller does not receive the braking signal any more, if the current discharging current of the battery is smaller than a preset discharging current, the first control switch is kept off and the second control switch is kept on until the current discharging current is larger than or equal to the preset discharging current, the first control switch is turned on and the second control switch is turned off.
5. The battery power feedback system of claim 2, wherein the third voltage detection terminal of the ECU controller is configured to be connected to the power supply feedback device;
the ECU controller is further used for determining a current capacitance value of the capacitor according to a current voltage of the capacitor in the electric energy supply feedback device detected by the second voltage detection end and the third voltage detection end in an initial power-on state, determining a pre-charging time for the electric energy supply feedback device according to a capacitance difference value between the current capacitance value of the capacitor and a preset capacitance value, determining and switching on a corresponding number of current limiting units in the current limiting circuit according to the pre-charging time and the capacitance difference value, so as to charge the capacitor in the electric energy supply feedback device, and switching off the current limiting unit and switching on the first control switch until the current voltage of the capacitor reaches the preset voltage value.
6. The battery power feedback system of claim 2 wherein the current limiting unit comprises a third control switch and a current limiting resistor;
a first end of the third control switch is used as a first end of the current limiting unit, a control end of the third control switch is used as a control end of the current limiting unit, and a second end of the third control switch is connected with one end of the current limiting resistor; and the other end of the current limiting resistor is used as a second end of the current limiting unit.
7. The battery power feedback system of claim 1 further comprising said power supply feedback device.
8. The battery power feedback system of claim 1 wherein the first control switch is a first relay;
one end of a switch contact of the first relay is used as a first end of the first control switch, the other end of the switch contact of the first relay is used as a second end of the first control switch, one end of a coil of the first relay is used as a control end of the first control switch, and the other end of the coil of the first relay is grounded.
9. A vehicle comprising the battery electric energy feedback system of any one of claims 1 to 8.
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| CN112671075A (en) * | 2021-01-14 | 2021-04-16 | 格力博(江苏)股份有限公司 | Electric tool |
| CN112910068A (en) * | 2020-11-23 | 2021-06-04 | 湖南中联重科智能高空作业机械有限公司 | Control device for motor driver, motor driver and overhead working truck |
| CN113504404B (en) * | 2021-06-01 | 2024-03-08 | 安徽恒晨新材料科技有限公司 | Lithium battery energy recovery detection device |
| CN114132182A (en) * | 2021-11-15 | 2022-03-04 | 株式会社Iat | Circuit, method and device for recovering braking energy |
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