CN112092629B - High-voltage distribution box, battery system and control method of high-voltage distribution box - Google Patents
High-voltage distribution box, battery system and control method of high-voltage distribution box Download PDFInfo
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- CN112092629B CN112092629B CN202010988956.2A CN202010988956A CN112092629B CN 112092629 B CN112092629 B CN 112092629B CN 202010988956 A CN202010988956 A CN 202010988956A CN 112092629 B CN112092629 B CN 112092629B
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The application discloses high voltage distribution box for electric automobile's battery system. The battery system includes the battery management system with high voltage distribution box electric connection, and high voltage distribution box includes: the device comprises an acquisition module, a control module and a switch module; the acquisition module is used for acquiring an electric signal of a loop where the switch module is located and sending the electric signal to the battery management system; the control module is used for receiving a control signal generated by the battery management system according to the electric signal so as to control the action of the switch module. In the high-voltage distribution box of the embodiment of the application, the acquisition module, the control module and the switch module are integrated in the high-voltage distribution box, so that high-voltage signals in the acquisition module are isolated from low-voltage signals in a battery management system, the circuit design inside the battery management system is simplified, and the convenience in upgrading the battery management system is improved. The application also discloses a battery system, a control method of the high-voltage distribution box and a storage medium.
Description
Technical Field
The present disclosure relates to the field of vehicle technologies, and in particular, to a high voltage distribution box, a battery system, a control method of the high voltage distribution box, and a storage medium.
Background
The safe reliability of new energy automobile has always been the focus of market, and in the correlation technique, through the high-voltage signal in the battery management system direct acquisition high voltage distribution box, still there is the low-voltage circuit in the battery management system simultaneously, need communicate between the high-low voltage circuit with the result output of high-pressure sampling, consequently need at battery management system internal design high-low voltage isolation circuit, so for battery management system internal design is complicated.
Disclosure of Invention
In view of the above, embodiments of the present application provide a high voltage distribution box, a battery system, a control method of the high voltage distribution box, and a storage medium.
The application provides a high voltage distribution box for electric automobile's battery system, battery system include with high voltage distribution box electric connection's battery management system, high voltage distribution box includes: the device comprises an acquisition module, a control module and a switch module;
the acquisition module is used for acquiring an electric signal of a loop where the switch module is located and sending the electric signal to the battery management system;
the control module is used for receiving a control signal generated by the battery management system according to the electric signal so as to control the action of the switch module.
In some embodiments, the switch module includes a first switch and a second switch, in the first state, the high-voltage distribution box controls the first switch to be closed and controls the second switch to be closed according to a precharge instruction, the acquisition module acquires a first voltage signal of a loop in which the first switch is located and a second voltage signal of a loop in which the second switch is located, and the battery management system determines whether the precharge operation is successful according to the first voltage signal and the second voltage signal.
In some embodiments, the switch module further includes a third switch, and the battery management system determines whether the pre-charge is successful according to a difference between the first voltage signal and the second voltage signal, sends an action command for closing the third switch and opening the second switch to the high voltage distribution box if the pre-charge is determined to be successful, and sends an action command for opening the first switch and opening the second switch to the high voltage distribution box if the pre-charge is determined to be failed.
In some embodiments, the switch module includes a first switch, a second switch, a third switch and a fourth switch, in the second state, the high-voltage distribution box controls the first switch, the second switch, the third switch and the fourth switch to be turned off according to a high-voltage power-on command, the acquisition module acquires a third voltage signal of a loop in which the first switch is located, a fourth voltage signal of a loop in which the second switch is located and a fifth voltage signal of a loop in which the fourth switch is located, and the battery management system determines whether the switch module is abnormal according to the third voltage signal, the fourth voltage signal and the fifth voltage signal.
In some embodiments, the battery management system determines whether the first switch, the second switch or the third switch is abnormal according to a difference value between the third voltage signal and the fourth voltage signal, determines whether the fourth switch is abnormal according to a difference value between the third voltage signal and the fifth voltage signal, and prohibits high-voltage power-up of a power battery of the electric vehicle under the condition that at least one of the first switch, the second switch, the third switch and the fourth switch is abnormal.
The application provides a battery system of electric automobile, battery system include battery management system and high voltage distribution box.
The application also provides a control method of the high-voltage distribution box, which is used for a battery system of an electric automobile, the battery system further comprises a battery management system electrically connected with the high-voltage distribution box, and the high-voltage distribution box comprises: the control method comprises the following steps of:
receiving the electric signal of the loop where the switch module is located, which is acquired by the acquisition module;
generating a control signal according to the electric signal;
and sending the control signal to the high-voltage distribution box so as to control the action of a switch module of the high-voltage distribution box.
In some embodiments, the switch module includes a first switch, a second switch, and a third switch, and in the first state, the high voltage distribution box closes the first switch and the second switch according to a pre-charge command, and the receiving the electrical signal collected by the collection module in the circuit in which the switch module is located includes:
receiving a first voltage signal of a loop where the first switch is located and a second voltage signal of a loop where the second switch is located, wherein the first voltage signal and the second voltage signal are collected by the collection module;
said generating a control signal from said electrical signal comprises:
judging whether pre-charging is successful or not according to the difference value of the first voltage signal and the second voltage signal, and sending control signals for closing the third switch and opening the second switch to the high-voltage distribution box under the condition that the pre-charging is successful;
and sending a control signal for opening the first switch and the second switch to the high-voltage distribution box under the condition that the pre-charging fails.
In some embodiments, the switch module includes a first switch, a second switch, a third switch and a fourth switch, and in the second state, the high voltage distribution box opens the first switch, the second switch, the third switch and the fourth switch according to a high voltage power-on command, and the receiving the electrical signal of the loop where the switch module is located acquired by the acquisition module includes:
receiving a third voltage signal of a loop where the first switch is located, a fourth voltage signal of a loop where the second switch is located and a fifth voltage signal of a loop where the fourth switch is located, which are collected by the collection module;
said generating a control signal from said electrical signal comprises:
and judging whether the first switch, the second switch, the third switch and the fourth switch are abnormal or not according to the difference value of the third voltage signal and the fourth voltage signal and the difference value of the third voltage signal and the fifth voltage signal, and sending a control signal for keeping the first switch, the second switch, the third switch and the fourth switch disconnected under the condition that at least one of the first switch, the second switch, the third switch and the fourth switch is abnormal so as to prohibit the power battery of the electric automobile from being electrified at high voltage.
One or more non-transitory computer-readable storage media storing a computer program that, when executed by one or more processors, implements the control method of the high voltage distribution box.
In the high-voltage distribution box, the battery system, the control method of the high-voltage distribution box and the storage medium in the embodiment of the application, the acquisition module, the control module and the switch module are integrated in the high-voltage distribution box, so that a high-voltage signal in the acquisition module is isolated from a low-voltage signal in the battery management system, the circuit design in the battery management system is simplified, and the convenience in upgrading the battery management system is improved.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block schematic diagram of a high voltage distribution box and battery system according to some embodiments of the present disclosure.
Fig. 2 is a circuit schematic diagram of a switch module of a high voltage distribution box of certain embodiments of the present application.
Fig. 3 is a flow chart illustrating a method of controlling a high voltage distribution box according to some embodiments of the present disclosure.
Fig. 4 is a schematic flow chart of a control method of the high voltage distribution box of certain embodiments of the present application in a first state.
Fig. 5 is a flow chart illustrating a method of controlling a high voltage distribution box according to some embodiments of the present disclosure in a second state.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
Referring to fig. 1, the present embodiment provides a high voltage distribution box 100, and a battery system 1000 for an electric vehicle, where the battery system 1000 includes a battery management system 200 electrically connected to the high voltage distribution box 100. The high voltage distribution box 100 includes an acquisition module 102, a control module 104, and a switch module 106.
The collection module 102 is configured to collect an electrical signal of the power battery, and send the electrical signal to the battery management system 200. The control module 104 is configured to receive a control signal generated by the battery management system 200 according to the electrical signal to control the switch module 106 to operate.
The embodiment of the application provides a battery system 1000 of an electric automobile, and the battery system 1000 comprises a battery management system 200 and a high-voltage distribution box 100.
In the related art, a battery management system is used for collecting high-voltage signals in a high-voltage distribution box, a control module is further included in the battery management system, low-voltage signals need to be processed, and due to the fact that the high-voltage signals and the low-voltage signals exist in the battery management system at the same time, the internal circuit design of the battery management system is complex, and the upgrading difficulty is high.
In the high voltage distribution box 100 of the present application, the collection module 102 provided in the battery management system 200 in the related art is integrated into the high voltage distribution box 100, the collection module 102 in the high voltage distribution box 100 collects the electrical signal of the battery system 1000, and the analog-digital converter 108 is provided in the high voltage distribution box 100, so that the high voltage analog signal collected by the collection module 102 is converted into a low voltage digital signal.
Thus, the high-voltage distribution box 100 collects high-voltage signals, and only low-voltage signals exist in the battery management system 200, so that high-voltage and low-voltage isolation of the battery management system 200 is realized, the circuit design in the battery management system 200 is simplified, and the convenience in upgrading the battery management system 200 is improved. And the setting of the analog-digital converter 108 also reduces the failure risk of the battery management system 200, and improves the circuit safety.
Further, in the related art, the battery management system 200 directly controls the high voltage distribution box 100 through a wire, and the battery management system 200 needs a wire to be connected to each relay for controlling the relay, so that the wiring is complicated. Not only is troubleshooting difficult due to increased routing, upgrading and adjusting the high voltage distribution box 100 becomes difficult.
In the embodiment of the application, the high-voltage distribution box 100 and the battery management system 200 CAN be connected through the CAN bus, and only two wires are needed to be connected, so that the circuit is more convenient to install and connect, and the communication integration level is improved. And an error detection and management module is integrated in the CAN bus, so that line faults are easy to check, and the circuit safety is improved. And because only low voltage signal in the battery management system 200 in this application, so, can reduce communication interference, improve circuit stability.
In some embodiments, the acquisition module 102 acquires an electrical signal of a loop in which the switch module 106 is located, and after the acquisition module 102 acquires the voltage signal and the current signal, the analog-to-digital converter 108 converts the high-voltage signal into a low-voltage digital signal, and then integrates the voltage signal and the current signal and sends the signals to the battery management system 200. The battery management system 200 processes the electrical signal sent by the acquisition module 102 and feeds back a corresponding control signal. The control module 104 controls the switch module 106 to operate according to the control signal fed back by the battery management system 200.
Referring to fig. 1 and fig. 2, the collecting module 102 mainly collects a voltage signal and a current signal. The voltage signals mainly acquire voltage signals between ab and ac points and between ad and ac points, and the voltage signals are high-voltage analog signals. The current signal mainly collects the signal of the Hall current sensor, and the signal is a digital signal. The collection module 102 integrates the voltage signal and the current signal and transmits the voltage signal and the current signal to the battery management system 200. The battery management system 200 calculates the state of charge, the state of health, and the like according to the voltage signal and the current signal, and can realize pre-charge detection and high-voltage charge detection at the same time.
In the high-voltage distribution box 100 and the battery system 1000 according to the embodiment of the application, the acquisition module 102, the control module 104 and the switch module 106 are integrated in the high-voltage distribution box 100, so that a high-voltage signal in the acquisition module 102 is isolated from a low-voltage signal in the battery management system 200, the circuit design inside the battery management system 200 is simplified, and the convenience of upgrading the battery management system 200 is improved.
Referring to fig. 1 and fig. 2 again, in some embodiments, the switch module 106 includes a first switch K1 and a second switch K2, in the first state, the high voltage distribution box 100 controls the first switch K1 to close and controls the second switch K2 to close according to the precharge command, the collecting module 102 collects a first voltage signal V1 of a loop in which the first switch K1 is located and a second voltage signal V2 of a loop in which the second switch K2 is located, and the battery management system 200 determines whether the precharge is successful according to the first voltage signal V1 and the second voltage signal V2.
Specifically, the first state may be a state in which the battery system 1000 is precharged. In the first state, the Vehicle Control Unit (VCU) sends a precharge command to the battery management system 200, and the battery management system 200 transmits the precharge command to the high-voltage distribution box 100. The precharge command may be a command for controlling the first switch K1 and the second switch K2 to be closed.
The high-voltage distribution box 100 receives a precharge power-up command, the control module 104 controls the first switch K1 and the second switch K2 to be closed, and the acquisition module 102 acquires a first voltage signal V1 of a loop in which the first switch K1 is located and a second voltage signal V2 of a loop in which the second switch K2 is located. The first voltage signal V1 of the battery assembly may be a voltage signal between two points ab, i.e. a voltage signal of the power battery. The second voltage signal V2 of the pre-charge capacitor can be a voltage signal between two points ac, i.e., a voltage signal of the pre-charge capacitor of the battery system 1000.
The acquisition module 102 converts the first voltage signal V1 and the second voltage signal V2 into low-voltage digital signals through the analog-to-digital converter 108, and transmits the first voltage signal V1 and the second voltage signal V2 to the battery management system 200 through the CAN bus. The battery management system 200 receives the electrical signal collected by the high voltage distribution box 100, and determines whether the pre-charging is successful according to the first voltage signal V1 and the second voltage signal V2.
It is understood that the battery management system 200 may receive the electrical signal of the collection module 102 for a predetermined time, considering a time error when the collection module 102 samples, etc. The predetermined time may be set according to parameters such as sampling frequency of the acquisition module 102, processor performance, vehicle usage conditions, and the like, and is not limited specifically, and may be, for example, 100 milliseconds, 300 milliseconds, 500 milliseconds, 1000 milliseconds, and the like.
Therefore, the accuracy of the sampling result can be ensured, and the reliability of the judgment result is improved.
Referring to fig. 1 and fig. 2 again, in some embodiments, the switch module 106 further includes a third switch K3, the battery management system 200 determines whether the pre-charge is successful according to a difference between the first voltage signal V1 and the second voltage signal V2, sends an action command to close the third switch K3 and open the second switch K2 to the high-voltage power distribution box 100 if the pre-charge is successful, and sends an action command to open the first switch K1 and open the second switch K2 to the high-voltage power distribution box 100 if the pre-charge is failed.
Specifically, the battery management system 200 calculates a difference between the first voltage signal V1 and the second voltage signal V2, and determines success or failure of the precharge when the difference is stable within a certain range and continuously reaches a predetermined time. The difference between the first voltage signal V1 and the second voltage signal V2 may be set according to parameters such as product characteristics of the relay, and may be, for example, 3V, 5V, 8V, 10V, 15V, and the like. The predetermined time for the duration of the difference value may be set according to parameters such as a sampling frequency of the acquisition module 102, processor performance, vehicle usage conditions, and the like, and is not limited to this, and may be, for example, 100 milliseconds, 300 milliseconds, 500 milliseconds, 1000 milliseconds, and the like.
In some embodiments, the difference between the first voltage signal V1 and the second voltage signal V2 is less than 5V and lasts for 100 ms, and it is determined that the precharge of the battery system 1000 is successful. The battery management system 200 sends an action command to close the third switch K3 and open the second switch K2 to the high voltage distribution box 100, and the control module 104 in the high voltage distribution box 100 controls the action of the switch module 106 according to the action command.
Further, the switch module 106 may close the third switch K3 first, delay for a predetermined time, and open the second switch K2. The third switch K3 is closed for delay waiting, so that a loop where the third switch K3 is located can be fully switched on, and the phenomenon that the second switch K2 is switched off when the third switch K3 is not fully closed is avoided, the second switch K2 is arcing, and the service life of the second switch K2 is influenced.
Therefore, the stable operation of the circuit can be ensured, and the safety and the stability of the circuit are improved.
In other embodiments, the difference between the first voltage signal V1 and the second voltage signal V2 is greater than 5V for 100 ms, and it is determined that the battery system 1000 has failed to precharge. The battery management system 200 sends an action command to the high voltage distribution box 100 to open the first switch K1 and open the second switch K2, and the control module 104 in the high voltage distribution box 100 controls the switch module 106 to act according to the action command.
Further, after the battery management system 200 determines that the pre-charging of the battery system 1000 fails, the battery management system may receive the electrical signal sent by the acquisition module 102 again, and repeat the determination process of pre-charging.
Thus, the accuracy of the determination result can be ensured, and the fault tolerance of the battery management system 200 can be improved.
Referring to fig. 1 and 2 again, in some embodiments, the switch module 106 includes a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4, in the second state, the high-voltage distribution box 100 controls the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 to be turned off according to the high-voltage power-on command, the collecting module 102 collects a third voltage signal V3 of a loop in which the first switch K1 is located, a fourth voltage signal V4 of a loop in which the second switch K2 is located, and a fifth voltage signal V5 of a loop in which the fourth switch K4 is located, and the battery management system 200 determines whether the switch module 106 is abnormal according to the third voltage signal V3, the fourth voltage signal V4, and the fifth voltage signal V5.
Specifically, the second state may be a state in which the battery system 1000 is powered on at high voltage. In the second state, the VCU sends a high-voltage power-on command to the battery management system 200, and the battery management system 200 transmits the high-voltage power-on command to the high-voltage distribution box 100. The high-voltage power-on command may be a command for controlling the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 to be turned off.
The high-voltage distribution box 100 receives a high-voltage power-on command, the control module 104 controls the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 to be switched off, and the acquisition module 102 continuously acquires the third voltage signal V3, the fourth voltage signal V4 and the fifth voltage signal V5. The third voltage signal V3 may be a voltage signal between two points ab, i.e. a voltage signal of the battery assembly. The fourth voltage signal V4 of the loop in which the second switch K2 is located may be a voltage signal between two points ac. The fifth voltage signal V5 of the loop in which the fourth switch K4 is located may be a voltage signal between two points ad.
The acquisition module 102 converts the third voltage signal V3, the fourth voltage signal V4, and the fifth voltage signal V5 into low-voltage digital signals through the analog-to-digital converter 108, and then sends the low-voltage digital signals to the battery management system 200 through the CAN bus. The battery management system 200 receives the electric signals collected by the high-voltage distribution box 100, monitors the states of the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4, and judges whether the switch module 106 is abnormal or not.
It is understood that the battery management system 200 may receive the electrical signal of the collection module 102 for a predetermined time, considering a time error when the collection module 102 samples, etc. The predetermined time may be set according to parameters such as sampling frequency of the acquisition module 102, processor performance, vehicle usage conditions, and the like, and is not limited specifically, and may be, for example, 100 milliseconds, 300 milliseconds, 500 milliseconds, 1000 milliseconds, and the like.
Therefore, the accuracy of the sampling result can be ensured, and the reliability of the judgment result is improved.
Referring again to fig. 1 and 2, in some embodiments, the battery management system 200 determines whether there is an abnormality in the first switch K1, the second switch K2 or the third switch K3 according to a difference between the third voltage signal V3 and the fourth voltage signal V4, the battery management system 200 determines whether there is an abnormality in the fourth switch K4 according to a difference between the third voltage signal V3 and the fifth voltage signal V5, and the battery management system prohibits the high-voltage power-up of the power battery of the electric vehicle in the case that at least one of the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 is abnormal.
Specifically, the battery management system 200 calculates a difference between the third voltage signal V3 and the fourth voltage signal V4, and determines that the first switch K1, the second switch K2, or the third switch K3 is normal or abnormal when the difference is stabilized within a certain range and continues for a predetermined time. The difference between the third voltage signal V3 and the fourth voltage signal V4 may be set according to parameters such as product characteristics of the relay, and may be, for example, 3V, 5V, 8V, 10V, 15V, and the like. The predetermined time for the duration of the difference value may be set according to parameters such as a sampling frequency of the acquisition module 102, processor performance, vehicle usage conditions, and the like, and is not limited to this, and may be, for example, 100 milliseconds, 300 milliseconds, 500 milliseconds, 1000 milliseconds, and the like.
It can be understood that, under the condition that the switches K1-K4 are normal, since the ac point and the ad point are both open and the ab point is closed, the fourth voltage signal V4 is much smaller than the third voltage signal V3, i.e., the difference between the third voltage signal V3 and the fourth voltage signal V4 is larger.
In some embodiments, the difference between the third voltage signal V3 and the fourth voltage signal V4 is less than 10V and lasts for 100 ms, it can be determined that the difference between the third voltage signal V3 and the fourth voltage signal V4 is smaller due to the second switch K2 or the third switch K3 being stuck. Therefore, it is determined that the second switch K2 or the third switch K3 has adhesion failure and the battery system 1000 is prohibited from being powered on at high voltage.
In other embodiments, if the difference between the third voltage signal V3 and the fourth voltage signal V4 is greater than 10V and the difference is decreasing, it can be determined that the difference between the third voltage signal V3 and the fourth voltage signal V4 is decreasing because the first switch K1 is stuck and the pre-charge capacitor is discharging. Therefore, the first switch K1 is judged to have adhesion fault, and the battery system 1000 is prohibited from being powered on at high voltage.
In other embodiments, the difference between the third voltage signal V3 and the fourth voltage signal V4 is greater than 10V for 1000 ms, and it can be determined that the switches K1-K3 are normal.
Therefore, whether the switches K1-K3 are in a normal state or not is judged according to the difference value of the third voltage signal V3 and the fourth voltage signal V4, and when one of the switches K1-K3 is abnormal, the high-voltage electrification of the battery system 1000 is prohibited, so that the stable operation of the circuit can be ensured, and the safety and the stability of the circuit can be improved.
Further, the battery management system 200 determines whether the fourth switch K4 is abnormal according to a difference between the third voltage signal V3 and the fifth voltage signal V5, and determines whether the fourth switch K4 is normal or abnormal when the difference is stabilized within a certain range and continues for a predetermined time. The difference between the third voltage signal V3 and the fifth voltage signal V5 and the predetermined duration of the difference are the same as those of the aforementioned determination of the difference between the third voltage signal V3 and the fourth voltage signal V4, and therefore, the description thereof is omitted here.
It can be understood that after the vehicle is charged by the charging gun and before the fourth switch K4 is closed, the fifth voltage signal V5 is much smaller than the third voltage signal V3, i.e., the difference between the third voltage signal V3 and the fifth voltage signal V5 is larger, because the two points ad are open and the two points ab are closed.
In some embodiments, the difference between the third voltage signal V3 and the fifth voltage signal V5 is less than 10V and lasts for 100 ms, it can be determined that the difference between the third voltage signal V3 and the fifth voltage signal V5 is small due to the fourth switch K4 being stuck. Therefore, the fourth switch K4 is judged to have adhesion fault, and the battery system 1000 is prohibited from being powered on at high voltage.
In other embodiments, the difference between the third voltage signal V3 and the fifth voltage signal V5 is greater than 10V and lasts for 1000 ms, and it can be determined that the fourth switch K4 is normal.
In this way, whether the fourth switch K4 is in the normal state can be determined according to the difference between the third voltage signal V3 and the fifth voltage signal V5. When at least one of the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 is abnormal, the battery system 1000 is prohibited from being powered on at high voltage, so that the stable operation of the circuit can be ensured, and the safety and the stability of the circuit can be improved.
In addition, terms such as the first voltage signal, the second voltage signal, and the third voltage signal described in the embodiments of the present application indicate voltage signals collected in different states, and do not represent the voltage magnitude.
Referring to fig. 3, the present application provides a control method of a high voltage distribution box 100, which is used for a battery system 1000 of an electric vehicle, wherein the battery system 1000 further includes a battery management system 200 electrically connected to the high voltage distribution box 100, and the high voltage distribution box 100 includes: the system comprises an acquisition module 102, a control module 104 and a switch module 106, and the control method comprises the following steps:
s10: receiving the electric signal of the loop where the switch module 106 is located, which is acquired by the acquisition module 104;
s20: generating a control signal according to the electrical signal;
s30: a control signal is sent to the high voltage distribution box 100 to control the switching module of the high voltage distribution box 100 to act.
The control method of the high voltage distribution box 100 according to the embodiment of the present application may be implemented by the battery management system 200.
In the control method of the high-voltage distribution box 100 and the battery management system 200 according to the embodiment of the present application, the collection module 102, the control module 104 and the switch module 106 are integrated in the high-voltage distribution box 100, so that a high-voltage signal in the collection module 102 is isolated from a low-voltage signal in the battery management system 200, the circuit design inside the battery management system 200 is simplified, and meanwhile, the convenience of upgrading the battery management system 200 is improved.
Referring to fig. 4, in some embodiments, the switch module 106 includes a first switch K1, a second switch K2, and a third switch K3, and in the first state, the high voltage distribution box 100 closes the first switch K1 and the second switch K2 according to the precharge power-up command, and the S10 includes:
s11: receiving a first voltage signal V1 of a loop where the first switch K1 is located and a second voltage signal V2 of a loop where the second switch K2 is located, which are acquired by the acquisition module 102;
s20 includes:
s21: judging whether the pre-charging is successful according to the difference value of the first voltage signal V1 and the second voltage signal V2, and sending a control signal for closing the third switch K3 and opening the second switch K2 to the high-voltage power distribution box 100 under the condition that the pre-charging is judged to be successful;
s22: a control signal for opening the first switch K1 and the second switch K2 is sent to the high voltage distribution box 100 in case of determining the precharge power-up failure.
Therefore, the stable operation of the circuit can be ensured, and the safety and the stability of the circuit are improved.
Referring to fig. 5, in some embodiments, the switch module 106 includes a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4, and in the second state, the high voltage distribution box 100 opens the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 according to the high voltage power-on command, and S10 includes:
s12: the receiving and acquiring module 106 acquires a third voltage signal V3 of a loop in which the first switch K1 is located, a fourth voltage signal V4 of a loop in which the second switch K2 is located, and a fifth voltage signal V5 of a loop in which the fourth switch K4 is located;
s20 includes:
s23: and judging whether the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 are abnormal or not according to the difference value of the third voltage signal V3 and the fourth voltage signal V4 and the difference value of the third voltage signal V3 and the fifth voltage signal V5, and sending control signals for keeping the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 disconnected to prohibit the power battery of the electric automobile from being electrified under high voltage under the condition that at least one of the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 is abnormal.
Therefore, the stable operation of the circuit can be further ensured, and the safety and the stability of the circuit are improved.
To be noted, the control method of the high voltage distribution box 100 of the present application, including the embodiments of the corresponding parts of the high voltage distribution box 100, is not repeated herein, and for related contents, please refer to the explanation of the related parts.
The embodiment of the application also provides a computer readable storage medium. One or more non-transitory computer-readable storage media storing a computer program that, when executed by one or more processors, implements the control method of the high voltage distribution box 100 of any of the embodiments described above.
The embodiment of the application also provides a vehicle. The vehicle includes memory and one or more processors, one or more programs being stored in the memory and configured to be executed by the one or more processors. The program includes a control method for executing the high voltage distribution box 100 according to any one of the above embodiments.
The processor may be used to provide computing and control capabilities to support the operation of the entire vehicle. The memory of the vehicle provides an environment for the computer readable instructions in the memory to operate.
It will be understood by those of ordinary skill in the art that all or part of the processes of the methods of the above embodiments may be implemented by hardware related to instructions of a computer program, which may be stored in one or more non-volatile computer-readable storage media, and when executed, may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), or the like.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A high voltage distribution box for a battery system of an electric vehicle, the battery system comprising a battery management system electrically connected to the high voltage distribution box, the high voltage distribution box comprising: the device comprises an acquisition module, a control module and a switch module; the device also comprises an analog-digital converter;
the acquisition module is used for acquiring an electric signal of a loop where the switch module is located, and the analog-digital converter is used for converting the electric signal acquired by the acquisition module into a digital signal in the same form as the electric signal acquired by the battery management system and sending the converted digital signal to the battery management system;
the control module is used for receiving a control signal generated by the battery management system according to the electric signal so as to control the switch module to act; the switch module comprises a first switch and a second switch, in a first state, the high-voltage distribution box controls the first switch to be closed and controls the second switch to be closed according to a pre-charging instruction, the acquisition module acquires a first voltage signal of a loop where the first switch is located and a second voltage signal of a loop where the second switch is located, and the battery management system judges whether pre-charging is successful or not according to the first voltage signal and the second voltage signal; the switch module further comprises a third switch, the battery management system judges whether the pre-charging is successful according to the difference value of the first voltage signal and the second voltage signal, sends an action instruction for closing the third switch and opening the second switch to the high-voltage distribution box under the condition that the pre-charging is successful, and sends an action instruction for opening the first switch and opening the second switch to the high-voltage distribution box under the condition that the pre-charging is failed; and after the battery management system judges that the pre-charging fails, the battery management system receives the electric signal sent by the acquisition module again and repeats the judgment process of the pre-charging.
2. The high-voltage distribution box according to claim 1, wherein the switch module comprises a first switch, a second switch, a third switch and a fourth switch, in the second state, the high-voltage distribution box controls the first switch, the second switch, the third switch and the fourth switch to be turned off according to a high-voltage power-on command, the acquisition module acquires a third voltage signal of a loop where the first switch is located, a fourth voltage signal of a loop where the second switch is located and a fifth voltage signal of a loop where the fourth switch is located, and the battery management system judges whether the switch module is abnormal according to the third voltage signal, the fourth voltage signal and the fifth voltage signal.
3. The high-voltage distribution box according to claim 2, wherein the battery management system judges whether the first switch, the second switch or the third switch is abnormal according to a difference value of the third voltage signal and the fourth voltage signal, judges whether the fourth switch is abnormal according to a difference value of the third voltage signal and the fifth voltage signal, and prohibits high-voltage electrification of a power battery of the electric vehicle under the condition that at least one of the first switch, the second switch, the third switch and the fourth switch is abnormal.
4. A battery system for an electric vehicle, characterized in that it comprises a battery management system and a high voltage distribution box according to any of claims 1-3.
5. A control method of a high-voltage distribution box is used for a battery system of an electric automobile, and is characterized in that the battery system further comprises a battery management system electrically connected with the high-voltage distribution box, and the high-voltage distribution box comprises: the control method comprises the following steps of:
receiving the electric signal of the loop where the switch module is located, which is acquired by the acquisition module;
generating a control signal according to the electric signal;
sending the control signal to the high-voltage distribution box so as to control the action of a switch module of the high-voltage distribution box; the switch module comprises a first switch, a second switch and a third switch, in a first state, the high-voltage distribution box closes the first switch and the second switch according to a pre-charging instruction, and the receiving of the electric signal of the loop where the switch module is located acquired by the acquisition module comprises:
receiving a first voltage signal of a loop where the first switch is located and a second voltage signal of a loop where the second switch is located, wherein the first voltage signal and the second voltage signal are collected by the collection module;
said generating a control signal from said electrical signal comprises:
judging whether pre-charging is successful or not according to the difference value of the first voltage signal and the second voltage signal, and sending control signals for closing the third switch and opening the second switch to the high-voltage distribution box under the condition that the pre-charging is successful;
sending a control signal for opening the first switch and the second switch to the high-voltage distribution box under the condition that the pre-charging fails;
and after the battery management system judges that the pre-charging fails, the battery management system receives the electric signal sent by the acquisition module again and repeats the judgment process of the pre-charging.
6. The control method according to claim 5, wherein the switch module comprises a first switch, a second switch, a third switch and a fourth switch, in the second state, the high-voltage distribution box opens the first switch, the second switch, the third switch and the fourth switch according to a high-voltage power-on command, and the receiving the electric signal collected by the collecting module in the loop of the switch module comprises:
receiving a third voltage signal of a loop where the first switch is located, a fourth voltage signal of a loop where the second switch is located and a fifth voltage signal of a loop where the fourth switch is located, which are collected by the collection module;
said generating a control signal from said electrical signal comprises:
and judging whether the first switch, the second switch, the third switch and the fourth switch are abnormal or not according to the difference value of the third voltage signal and the fourth voltage signal and the difference value of the third voltage signal and the fifth voltage signal, and sending a control signal for keeping the first switch, the second switch, the third switch and the fourth switch disconnected under the condition that at least one of the first switch, the second switch, the third switch and the fourth switch is abnormal so as to prohibit the power battery of the electric automobile from being electrified at high voltage.
7. One or more non-transitory computer-readable storage media storing a computer program which, when executed by one or more processors, implements the control method of the high voltage distribution box according to any one of claims 5 to 6.
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| CN113212168B (en) * | 2021-05-19 | 2023-03-31 | 广州小鹏汽车科技有限公司 | Direct-current discharge circuit, control method and electric vehicle |
| CN113479066B (en) * | 2021-08-17 | 2023-03-24 | 金华氢途科技有限公司 | High-integration-level multifunctional high-voltage distribution box for forklift |
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| JP5453184B2 (en) * | 2010-06-28 | 2014-03-26 | 日立ビークルエナジー株式会社 | Battery control circuit |
| DE102012204965A1 (en) * | 2012-03-28 | 2013-10-02 | Robert Bosch Gmbh | Battery system, motor vehicle with battery system and method for putting a battery system into operation |
| JP6105236B2 (en) * | 2012-09-11 | 2017-03-29 | 三菱電機株式会社 | Merging unit |
| US20150295421A1 (en) * | 2014-04-10 | 2015-10-15 | Ford Global Technologies, Llc | Active isolated circuit for precharging and discharging a high voltage bus |
| CN204679600U (en) * | 2015-06-19 | 2015-09-30 | 安徽江淮汽车股份有限公司 | A kind of power brick high-voltage relay bonding fault diagnosis system |
| CN106564390B (en) * | 2015-10-12 | 2020-04-21 | 北京新能源汽车股份有限公司 | Electric automobile and high-voltage system, detection method and pre-charging circuit thereof |
| CN108627765A (en) * | 2017-03-20 | 2018-10-09 | 华为技术有限公司 | A kind of detection circuit, method and apparatus |
| US11117486B2 (en) * | 2017-05-04 | 2021-09-14 | Iotecha Corp. | Method and apparatus for charging a battery using local power grid topology information |
| CN107607778B (en) * | 2017-10-23 | 2023-12-15 | 宁德时代新能源科技股份有限公司 | Current detection circuit and method in battery high-voltage loop, detector, battery device, carrier and computer storage readable medium |
| CN110539640B (en) * | 2018-05-28 | 2021-11-12 | 比亚迪股份有限公司 | Power distribution system of vehicle and rail vehicle |
| CN208904759U (en) * | 2018-06-21 | 2019-05-24 | 贵州电网有限责任公司 | Information acquisition system suitable for power system device |
| CN109739211B (en) * | 2018-12-29 | 2020-11-03 | 蜂巢能源科技有限公司 | Diagnosis system for load circuit and electric vehicle |
| CN109818393B (en) * | 2019-01-23 | 2020-05-19 | 宁德时代新能源科技股份有限公司 | Pre-charging circuit and pre-charging method of high-voltage battery pack |
| CN109888864B (en) * | 2019-02-25 | 2021-03-23 | 宁德时代新能源科技股份有限公司 | Battery management system |
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