WO2023236451A1 - Système de protection contre les courts-circuits, et système de batterie de traction de véhicule électrique - Google Patents

Système de protection contre les courts-circuits, et système de batterie de traction de véhicule électrique Download PDF

Info

Publication number
WO2023236451A1
WO2023236451A1 PCT/CN2022/133115 CN2022133115W WO2023236451A1 WO 2023236451 A1 WO2023236451 A1 WO 2023236451A1 CN 2022133115 W CN2022133115 W CN 2022133115W WO 2023236451 A1 WO2023236451 A1 WO 2023236451A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
current
circuit breaker
short
protection device
Prior art date
Application number
PCT/CN2022/133115
Other languages
English (en)
Chinese (zh)
Inventor
刘光生
王杭挺
刘安龙
Original Assignee
广州小鹏汽车科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 广州小鹏汽车科技有限公司 filed Critical 广州小鹏汽车科技有限公司
Publication of WO2023236451A1 publication Critical patent/WO2023236451A1/fr

Links

Images

Classifications

    • 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
    • B60L3/04—Cutting off the power supply under fault conditions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • This application relates to the technical field of power batteries, and specifically to a short-circuit protection system and a power battery system for electric vehicles.
  • this application provides a short circuit protection system and a power battery system for electric vehicles, which can improve the reliability of circuit breaker protection.
  • this application provides a short-circuit protection system, including: a current monitoring device, a control module, and a circuit breaker protection device;
  • the control module is configured to output a circuit breaker driving signal to the circuit breaker protection device according to a set strategy according to the overcurrent alarm signal;
  • the circuit breaker protection device is connected in series to the main circuit, and is configured to be triggered to the disconnection state in a self-triggering manner in response to the short-circuit current of the main circuit, or to be triggered to the disconnection state in an external triggering manner in response to the circuit breaker driving signal. status, causing the main circuit to be disconnected.
  • the system further includes: a relay, connected in series to the main circuit;
  • the circuit breaker protection device includes a fuse and a circuit breaker, and the fuse is connected in series with the circuit breaker;
  • the circuit breaker protection device being triggered to an off state in a self-triggering manner in response to the short circuit current includes:
  • the circuit breaker includes a pyrotechnic circuit breaker with an igniter and a drive control circuit; the drive control circuit includes:
  • a rectifier bridge connected to the igniter and connected to the control module through an external trigger interface
  • a current limiting and transient suppression unit connected to the fuse through an internal drive lead;
  • An isolation transformer is connected between the rectifier bridge and the current limiting and transient suppression unit.
  • the control module obtains the short-circuit current value according to the overcurrent alarm signal
  • the control module sends a signal to the circuit-breaker protection device.
  • the device outputs the circuit breaker driving signal.
  • the overcurrent alarm signal includes a short-circuit current related value
  • the short-circuit current related value is obtained based on the detection result of the Hall current sensor; if the monitored short-circuit current exceeds the preset threshold, the short-circuit current correlation value is obtained based on the detection result of the Hall current sensor. The short-circuit current correlation value is obtained from the detection result of the shunt.
  • the current monitoring device includes a shunt and a current detection chip
  • the shunt is connected in series to the main circuit and is used to output the sampling voltage
  • system further includes:
  • the drive circuit is connected to the current monitoring device, the circuit breaker protection device and the controller, and is used to detect the overcurrent alarm signal output by the current monitoring device or detect the circuit breaker protection output by the controller. In the case of a signal, the circuit breaker driving signal is output to the circuit breaker protection device.
  • the temperature detection sensor includes an NTC temperature detection sensor.
  • the circuit breaker protection device when a short circuit occurs in the main circuit, can be triggered to the off state in a self-triggering manner in response to the short circuit current of the main circuit, or can be triggered to the off state in an external triggering manner in response to the circuit breaker drive signal of the control module. In this way, even if there is a circuit break between the control module and the circuit breaker protection device, the circuit breaker protection device can still be triggered to the disconnected state through the self-triggering method. Therefore, the effectiveness of the main circuit circuit breaker protection can be improved. reliability.
  • Figure 1 is a schematic structural diagram of a short circuit protection system according to an embodiment of the present application.
  • Figure 2 is a schematic structural diagram of a short circuit protection system according to another embodiment of the present application.
  • Figure 3 is a schematic structural diagram of a short circuit protection system according to another embodiment of the present application.
  • Figure 4 is an enlarged view of the circuit breaker protection device of the short circuit protection system in the embodiment of Figure 3;
  • Figure 5 is a schematic diagram of the wiring of a shunt according to an embodiment of the present application.
  • Figure 6 shows the NTC temperature detection sensor in the short circuit protection system according to an embodiment of the present application
  • Figure 7 is a schematic diagram of the relationship between the main circuit short-circuit current I and the self-triggering action time t of the circuit breaker protection device according to an embodiment of the present application.
  • first information may also be called second information, and similarly, the second information may also be called first information. Therefore, features defined as “first” and “second” may explicitly or implicitly include one or more of these features.
  • “plurality” means two or more than two, unless otherwise explicitly and specifically limited.
  • Figure 1 is a schematic structural diagram of a short circuit protection system according to an embodiment of the present application.
  • a short circuit protection system includes a current monitoring device 110, a control module 12, and a circuit breaker protection device 13.
  • the current monitoring device 110 is used to monitor the current of the main circuit of the circuit system to be protected, and output an overcurrent alarm signal when a short-circuit current is detected. It can be understood that in the embodiment of the present application, when the current in the main circuit is greater than a specific value (for example, the first current threshold), it can be considered that the main circuit is short-circuited. In this case, the current in the main circuit is called a short-circuit current.
  • a specific value for example, the first current threshold
  • the control module 12 is configured to output a circuit breaker driving signal to the circuit breaker protection device 13 according to a set strategy according to the overcurrent alarm signal.
  • the circuit breaker protection device when a short circuit occurs in the main circuit, can be triggered to the off state in a self-triggering manner in response to the short-circuit current of the main circuit, or can be triggered to the off state in an external triggering manner in response to the circuit breaker driving signal of the control module. open state, thus disconnecting the main circuit.
  • the circuit breaker protection device can still be triggered to the off state through a self-triggering method, thus improving the reliability of the main circuit circuit breaker protection.
  • Figure 2 is a schematic structural diagram of a short circuit protection system according to another embodiment of the present application.
  • the relay is connected in series to the main circuit 21 and is used to disconnect the main circuit 21 in response to the disconnection control signal of the control module 12 .
  • the relays include a main positive relay 141 and a main negative relay 142 .
  • the main positive relay 141 and the main negative relay 142 are respectively connected in series to the main circuit 21 .
  • the control module 12 can output a disconnection control signal to the main positive relay 141 and the main negative relay 142 according to the overcurrent alarm signal according to the set strategy, so that the main positive relay 141 and the main negative relay 142 are disconnected.
  • the negative relay 142 is disconnected, thereby disconnecting the main circuit 21 of the power battery system 31 .
  • the current monitoring device includes a current sensor and a current detection chip.
  • the current sensor may include a shunt 111, for example.
  • the shunt 111 is connected in series to the main circuit 21 and is used to output the current detection sampling voltage of the main circuit; the current detection chip is used to output an over-current alarm containing the voltage value of the sampling voltage when a short-circuit current is detected based on the sampling voltage. Signal.
  • the overcurrent warning signal may include other types of short-circuit current related values, or may not include short-circuit current related values.
  • the current monitoring device of the present application is not limited to this.
  • the current sensor includes a Hall current sensor. The Hall current sensor can be placed on the copper bar of the main circuit 21, induce the magnetic field generated by the current in the copper bar through the Hall effect, and output the current detection sample of the main circuit. Voltage.
  • the current detection device includes a shunt 111 and a Hall current sensor.
  • the overcurrent alarm signal output by the current monitoring device includes short-circuit current related values, such as sampling voltage values; among them, if the short-circuit current monitored by the current monitoring device does not exceed the preset threshold, the short-circuit current related value is obtained based on the detection results of the Hall current sensor. value, if the monitored short-circuit current exceeds the preset threshold, the relevant value of the short-circuit current is obtained based on the detection result of the shunt.
  • short-circuit current of the main circuit is less than 500A
  • short-circuit protection control can be performed based on the detection results of the Hall current sensor. If the short-circuit current of the main circuit is greater than or equal to the set 500A, short-circuit protection control can be carried out based on the detection results of the shunt.
  • a shunt and a Hall current sensor are used to detect the short-circuit current of the main circuit. If the short-circuit current does not exceed the preset threshold, select the detection result of the Hall current sensor for short-circuit protection control, and verify the detection result of the Hall current sensor with the detection result of the shunt; if the short-circuit current exceeds the preset threshold, select the shunt The detection results of the device are used for short circuit protection control.
  • a shunt and a Hall current sensor are used to detect the current of the main circuit. It is compatible with the advantages of the shunt's large current range and low accuracy and the Hall current sensor's small current range and high accuracy.
  • the short-circuit protection response speed can be improved based on the rapid detection of the shunt, thereby reducing or avoiding the adverse impact of the short-circuit current on the main circuit.
  • control module 12 includes a controller and a drive circuit; the controller is connected to the current monitoring device, and is used to output a circuit breaker protection signal to the drive circuit when an overcurrent alarm signal output by the current monitoring device is detected; the driver The circuit is connected to the circuit breaker protection device 13 and the controller, and is used to output a circuit breaker driving signal to the circuit breaker protection device 13 when an overcurrent alarm signal output by the current monitoring device is detected, so that the circuit breaker protection device 13 is triggered by an external triggering method. disconnected state, thus disconnecting the main circuit 21.
  • the driving circuit is also connected to the current monitoring device, and is used to output a circuit breaker driving signal to the circuit breaker protection device 13 when an overcurrent alarm signal output by the current monitoring device is detected; in this way, the current monitoring device can drive the circuit breaker.
  • the circuit directly triggers the circuit break protection device 13, which can improve the reliability and timeliness of the circuit break protection.
  • the driving circuit may include a dedicated driving chip, but is not limited thereto.
  • the controller obtains the short-circuit current value based on the over-current alarm signal; when the short-circuit current value does not exceed the second current threshold, outputs a disconnection control signal to the relay; and, when the short-circuit current value exceeds the second current threshold In the case of , the circuit breaker driving signal is output to the circuit breaker protection device 13 .
  • outputting the circuit-breaking driving signal to the circuit-breaking protection device 13 includes:
  • outputting a circuit-breaking driving signal to the circuit-breaking protection device 13 also includes:
  • the circuit-breaker drive signal is output to the circuit-breaker protection device 13 , and the circuit-breaker protection device 13 is disconnected within the second period of time. 13 is not triggered, the circuit breaker driving signal is output to the circuit breaker protection device 13 again; wherein the second duration is longer than the first duration.
  • outputting a circuit-breaking driving signal to the circuit-breaking protection device 13 also includes:
  • a disconnection control signal is output to the relay, wherein the third period of time is greater than the second period of time.
  • Figure 3 is a schematic structural diagram of a short circuit protection system according to another embodiment of the present application.
  • the short-circuit protection system includes a shunt 111 , a high-voltage monitoring control module 12 , and a circuit breaker protection device 13 .
  • the high-voltage monitoring control module 12 may include a single micro control unit chip 122 or other types of control chips.
  • the high-voltage part and the low-voltage part are isolated from each other by an isolation power chip 126 and a signal isolation chip 127 .
  • the external interface of the low-voltage part includes a power signal interface, a CAN signal interface, a wake-up signal interface, a collision signal interface, a Hall current sensor signal interface, and a drive signal interface of the circuit breaker protection device 13 .
  • the external interface of the high-voltage part includes a temperature acquisition signal interface, a voltage acquisition signal interface, and a high-voltage loop reference ground signal interface for the shunt 111.
  • the shunt 111 is connected in series to the main circuit 21 and is used to output the current detection sampling voltage of the main circuit.
  • the current detection chip 125 detects a short-circuit current based on the sampling voltage, it can use the overcurrent alarm signal to directly drive the dedicated driver chip 123 through the hardware circuit to trigger the circuit breaker protection device 13 .
  • the current detection chip 125 can also send the overcurrent alarm signal to the MCU chip 122; the MCU chip 122 triggers the circuit breaker protection device 13 through the dedicated drive chip 123 according to the set strategy based on the short-circuit current related value contained in the overcurrent alarm signal. .
  • the internal drive interface of the drive control board 133 is connected to the isolation unit through the current limiting and transient suppression unit.
  • the primary side of the transformer and the secondary side of the isolation transformer are connected to the igniter drive interface of the pyrotechnic circuit breaker 132 through the rectifier bridge.
  • the igniter pushes the push rod to cut off the main circuit of the pyrotechnic circuit breaker 132, so that the circuit breaker protection device 13 is triggered to the disconnected state; the second method is self-triggering, and the pyrotechnic circuit breaker 132
  • the igniter is triggered by the internal driving voltage generated by the melting and arcing of the thermal fuse 131.
  • the short-circuit current causes the thermal fuse 131 to melt and arc to generate an internal driving voltage, which generates a current in the internal driving lead, and the current passes through the current limiting and transient suppression unit and the isolation transformer.
  • the igniter of the pyrotechnic circuit breaker 132 is triggered.
  • the igniter pushes the push rod to cut off the main circuit of the pyrotechnic circuit breaker 132, causing the circuit breaker protection device 13 to be triggered to the disconnected state, thus disconnecting the main circuit 21 of the battery system 31.
  • the resistance value or breakdown voltage of the current limiting and transient suppression unit can be adjusted to set the self-triggering condition of the circuit breaker protection device 13 .
  • the shunt 111 is configured with a first temperature output terminal group, a second temperature output terminal group, a first voltage output terminal group, and a second voltage output terminal group; wherein: the first temperature output terminal group and the second temperature output terminal group The output terminal group is used to output the detected temperatures on both sides of the shunt 111 respectively; the first voltage output terminal group is used to output the high-speed sampling voltage at both ends of the shunt 111; the second voltage output terminal group is used to output the low-speed sampling voltage at both ends of the shunt.
  • the current detection chip 125 of the control module is connected to the shunt 111 through multiple pins (Pin), wherein the pin Pin1 and the pin Pin2 are connected to the first temperature output terminal group at one end of the shunt 111 for Obtain the temperature at one end of the shunt 111; pins Pin8 and Pin9 are connected to the second temperature output terminal group at the other end of the shunt 111 for obtaining the temperature at the other end of the shunt 111; pins Pin4 and Pin5 are connected to The first voltage output terminal group at both ends of the alloy of the shunt 111 is used to obtain the sampling voltage at both ends of the alloy of the shunt 111.
  • Pins Pin3 and Pin6 are connected to the second voltage output terminal group at both ends of the alloy of the shunt 111.
  • pin 7 is used to measure the high-voltage loop reference ground.
  • one of the first voltage output terminal group and the second voltage output terminal group outputs a high-speed sampling voltage, and the other group outputs a low-speed sampling voltage.
  • NTC Negative Temperature Coefficient, negative temperature coefficient
  • thermistors can be respectively set at both ends of the shunt 111 to detect the temperatures at both ends of the shunt 111 respectively.
  • the first temperature output terminal group and the second temperature output terminal group of the shunt 111 are respectively connected to corresponding NTC thermistors.
  • the current detection chip 125 is connected to the first temperature output terminal group through the pin Pin1 and the pin Pin2 and the third temperature output terminal group.
  • the pins Pin8 and Pin9 connected to the two temperature output terminal groups obtain the temperature detection signals at both ends of the shunt 111 .
  • NTC temperature detection sensors 151 are provided at both ends of the circuit breaker protection device 13 for detecting the temperature of the circuit breaker protection device 13; when the control module 12 monitors that the temperature of the circuit breaker protection device 13 reaches 130°C , sending out a first-level over-temperature alarm signal; when the temperature reaches 140 degrees Celsius, a second-level over-temperature alarm signal is sent out. It can be understood that in another embodiment, only one temperature detection sensor may be provided.
  • a current of 500A is suitable for a 50u ⁇ shunt.
  • the accuracy of the shunt can be reduced, for example, controlled within 5%, and the shunt is calibrated and compensated. Through the calibration compensation of the shunt, the impact of the reduction in the accuracy of the shunt on the measurement is reduced.
  • the calibration of the shunt 111 includes the calibration of the initial resistance value, the calibration of the temperature coefficient, the calibration of the long-term stability parameters, and the calibration of the thermoelectric coefficient.
  • the initial resistance, temperature coefficient, long-term stability parameter, thermoelectric coefficient of the shunt 111 and the operational amplifier gain coefficient and offset of the control module 12 are calibrated, and the initial value obtained by the calibration is
  • the resistance, temperature coefficient, long-term stability parameters, thermoelectric coefficient, op amp gain coefficient, and offset are marked with two microcodes, and the calibrated parameters are written into the MCU chip 122.
  • thermoelectric coefficient EMF of the shunt The metal terminal and the alloy terminal of the shunt are two different electrical conductors. When there is a temperature difference, a potential difference will occur between the two different electrical conductors, and the potential difference will be superimposed to the actual collected voltage, leading to measurement errors.
  • a set number of shunts from the same batch as the shunt can be sampled and measured to obtain the average thermoelectric coefficient EMF of the set number of shunts.
  • the average thermoelectric coefficient EMF can be used for the shunt.
  • the temperature coefficient TCR refers to the proportion of the shunt resistance that changes with temperature.
  • the temperature coefficient is nonlinear. Therefore, it is necessary to select a shunt with a TCR as low as possible to reduce the difficulty of later calibration.
  • the data reference for this parameter must be clearly defined as the TCR of the entire shunt.
  • the temperature drift distribution curve of the same batch of shunts is analyzed using a regression analysis method to obtain the formula of the temperature drift distribution curve, that is, the change formula of the resistance drift of the shunt relative to the temperature value.
  • This formula must be at least a cubic function (regression parabola). More accurately describes the temperature drift curve changes.
  • the cubic function has 4 coefficients. In theory, at least 4 measurement points can meet the requirements. An additional temperature measurement point is added for closed-loop detection.
  • the compensation value for each degree Celsius can be obtained through special software.
  • This compensation value can integrate the initial accuracy error and be pre-stored in the E2PROM of the MCU chip through the bus through a lookup table to improve the accuracy of the shunt resistance. Compensation efficiency.
  • the initial value of the shunt temperature coefficient TCR is 1 (20°C ⁇ 30°C), from -40°C ⁇ 150 °C, set the T TCR value with a gradient of 10°C.
  • the T TCR is obtained by looking up the table based on the average value of the two temperatures of the shunt:
  • the calibration of the controller's operational amplifier gain coefficient k and offset b can be completed by actual measurement and calibration of the matching shunt on the production line.
  • the sampling range is calibrated in sections.
  • the current calibration interval is exemplarily set as shown in Table 2:
  • control module 12 obtains the voltage value of the sampling voltage of the shunt 111, and obtains the calibrated short-circuit current value according to the pre-stored calibration parameters of the shunt 111 and the voltage value of the sampling voltage, wherein the pre-stored calibration parameters at least include the following parts or All: Calibrated initial resistance, temperature coefficient, long-term stability parameters, thermoelectric coefficient of shunt 111.
  • control module 12 obtains the calibrated short-circuit current value I according to the following formula:
  • V measure is the voltage value of the sampling voltage of the shunt 111;
  • R shunt is the calibrated initial resistance value of the shunt 111;
  • V EMF is the thermoelectric voltage of the shunt 111.
  • V EMF EMF ⁇ (T 1 -T 2 )
  • V EMF EMF ⁇ (T 2 -T 1 ) during charging
  • L LTS is the long-term stability coefficient of the shunt 111, k is the gain coefficient of the operational amplifier;
  • b is the offset amount;
  • T 1 is the temperature value collected by the temperature detection sensor at one end of the shunt 111;
  • T 2 is the temperature value collected by the temperature detection sensor at the other end of the shunt 111;
  • EMF is the thermoelectric value of the shunt
  • the short-circuit protection strategy of one embodiment of the present application is described as follows. It can be understood that the present application is not limited to this.
  • the control module 12 determines that the current in the main circuit is less than the first current threshold (I0) and receives a high-voltage cutoff instruction from the BMS (Battery Management System) of the battery system 31 , for example, Then the main positive relay 141 and the main negative relay 142 are controlled to disconnect the main circuit, and the relays are used for short-circuit protection; when the control module 12 determines that the current in the main circuit is less than the first current threshold (I0), and no high-voltage interruption instruction is received, Then the current of the main circuit 21 is regarded as the normal operating current and no processing is performed.
  • the BMS Battery Management System
  • control module 12 when the control module 12 determines that the current in the main circuit 21 is greater than or equal to the first current threshold (I0) and less than the second current threshold (I1), it delays for a third time (t3) and controls the main circuit.
  • the positive relay 141 and the main negative relay 142 disconnect the main circuit 21, and the relay is used for short circuit protection.
  • the second current threshold is a critical value of current at which the relay can switch between normal on and off.
  • control module 12 when the control module 12 determines that the current in the main circuit 21 is greater than or equal to the second current threshold (I1) and less than the third current threshold (I2), it delays the second time period (t2) and drives the circuit breaker protection. device 13, so that the circuit breaker protection device 13 is externally triggered to disconnect the main circuit 21, and the external trigger circuit breaker protection device 13 is used for short circuit protection.
  • the control module 12 detects that the circuit breaker protection device 13 is in a non-triggered state within the third period of time (t3), controls the main positive relay 141 and the main negative relay 142 to disconnect the main circuit 21, and uses relays to perform the operation.
  • Short circuit protection relay cuts off with load. After the relay is disconnected within this short-circuit current range, a voltage potential will be formed between the relay contacts, so that the electric energy required to melt the thermal fuse 131 will not be sufficient, so the circuit-breaker protection device 13 does not have self-triggering short-circuit protection capability.
  • control module 12 when the control module 12 determines that the current in the main circuit 21 is greater than or equal to the third current threshold (I2) and less than the fourth current threshold (I3), it delays the second time period (t2) and drives the circuit breaker protection. device 13, so that the circuit breaker protection device 13 is externally triggered to disconnect the main circuit 21, and the external trigger circuit breaker protection device 13 is used for short circuit protection.
  • the control module 12 determines that the current in the main circuit 21 is greater than or equal to the fourth current threshold (I3) and less than the fifth current threshold (I4), the thermal fuse 131 is blown and the self-triggered circuit breaker protection device 13 is triggered early. After the second delay time (t2) of the controller, the main circuit 21 is triggered to disconnect, and the circuit breaker protection device 13 performs self-triggered short-circuit protection.
  • the fourth current threshold is the corresponding short-circuit current value when the thermal fuse blows and the protection time of the self-triggered circuit breaker protection device is equal to the second duration, so that the circuit breaker protection device can be self-triggered within the second duration.
  • the control module 12 If the circuit breaker protection device 13 does not operate due to self-triggering or two external triggers, and the control module 12 detects that the circuit breaker protection device 13 is in a non-triggered state within the third period of time (t3), it controls the main positive relay 141 and the main negative relay 142 to disconnect.
  • the main circuit 21 uses a relay for short-circuit protection, and the relay cuts off with load.
  • the control module 12 If the circuit breaker protection device 13 is neither self-triggered nor externally triggered, and the control module 12 detects that the circuit breaker protection device 13 is in a non-triggered state within the second time period (t2), it drives the circuit breaker protection device 13 so that the circuit breaker protection device 13 is externally triggered.
  • the main circuit 21 is disconnected and an externally triggered circuit breaker protection device 13 is used for short circuit protection.
  • the first current threshold is 1000A
  • the second current threshold is 1500A
  • the third current threshold is 4300A
  • the fourth current threshold is 4700A
  • the fifth current threshold is 6000A
  • the sixth current threshold is 7500A
  • the first duration t1 is 5ms
  • the second duration t2 is 100ms
  • the third duration t3 is 200ms. It can be understood that the present application is not limited to this.
  • the control module when a short circuit occurs in the main circuit, the control module can promptly drive the circuit breaker protection device according to the current signal of the main circuit, so that the circuit breaker protection device disconnects the main circuit in time to protect the main circuit. For example, based on the rapid detection results of the shunt, the control module can drive the circuit breaker protection device to trigger an external trigger to disconnect the main circuit in a very short time (for example, the first delay time is 5ms), so that when a large current short circuit occurs, the control module can quickly Protect the main circuit.
  • the control module can drive the circuit breaker protection device to trigger an external trigger to disconnect the main circuit in a very short time (for example, the first delay time is 5ms), so that when a large current short circuit occurs, the control module can quickly Protect the main circuit.
  • curve 71 in the figure represents the relationship between the main circuit short-circuit current I (kA) and the self-triggering action time t (s) of the circuit breaker protection device 13.
  • the circuit-breaker protection device 13 can self-trigger within time t1 (5ms); when the short-circuit current is I3 (4700A) ⁇ I5 (7500A), the circuit-breaker protection device 13 can trigger at time t2 (100ms). It can self-trigger within time t3 (200ms) when the short-circuit current is I2 (4300A) ⁇ I3 (4700).

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

La présente invention concerne un système de protection contre les courts-circuits, et un système de batterie de traction d'un véhicule électrique. Le système de protection contre les courts-circuits comprend : un appareil de surveillance de courant (110), un module de commande (12) et un appareil de protection de circuit ouvert (13), l'appareil de surveillance de courant (110) étant utilisé pour surveiller le courant d'une boucle principale d'un système de circuit à protéger, et émettre un signal d'alarme de surintensité lorsqu'un courant de court-circuit est détecté ; le module de commande (12) est utilisé pour émettre, en fonction du signal d'alarme de surintensité, un signal de commande de circuit ouvert à l'appareil de protection de circuit ouvert (13) selon une stratégie définie ; et l'appareil de protection de circuit ouvert (13) est connecté en série à la boucle principale, et est utilisé pour être déclenché, en réponse à un courant de court-circuit dans la boucle principale et d'une manière auto-déclenchée, pour entrer dans un état de déconnexion, ou étant déclenché, en réponse au signal d'attaque de circuit ouvert et d'une manière déclenchée de l'extérieur, pour entrer dans l'état de déconnexion, de telle sorte que la boucle principale est déconnectée.
PCT/CN2022/133115 2022-06-08 2022-11-21 Système de protection contre les courts-circuits, et système de batterie de traction de véhicule électrique WO2023236451A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210640894.5 2022-06-08
CN202210640894.5A CN114851852A (zh) 2022-06-08 2022-06-08 短路保护系统及电动交通工具的动力电池系统

Publications (1)

Publication Number Publication Date
WO2023236451A1 true WO2023236451A1 (fr) 2023-12-14

Family

ID=82623870

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/133115 WO2023236451A1 (fr) 2022-06-08 2022-11-21 Système de protection contre les courts-circuits, et système de batterie de traction de véhicule électrique

Country Status (2)

Country Link
CN (1) CN114851852A (fr)
WO (1) WO2023236451A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114851852A (zh) * 2022-06-08 2022-08-05 广州小鹏汽车科技有限公司 短路保护系统及电动交通工具的动力电池系统
CN116365635B (zh) * 2023-02-24 2024-05-17 肇庆小鹏汽车有限公司 动力电池组的短路保护电路、方法以及装置
CN117040050B (zh) * 2023-07-26 2024-04-02 小米汽车科技有限公司 电路的分断控制方法、系统、装置及电子设备

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111817256A (zh) * 2020-07-10 2020-10-23 的卢技术有限公司 一种基于精准测量的电池紧急断开系统及使用方法
CN215300153U (zh) * 2021-03-19 2021-12-24 长城汽车股份有限公司 一种车辆高压回路及其车辆
CN113949032A (zh) * 2020-07-16 2022-01-18 上海汽车集团股份有限公司 高压回路的切断方法、控制器及高压系统
CN114336879A (zh) * 2022-01-06 2022-04-12 广州小鹏汽车科技有限公司 电池电路、电池管理系统、电池模组及电动汽车
CN114792965A (zh) * 2021-01-25 2022-07-26 长城汽车股份有限公司 电池保护系统、电池保护方法和车辆
CN114851852A (zh) * 2022-06-08 2022-08-05 广州小鹏汽车科技有限公司 短路保护系统及电动交通工具的动力电池系统

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111817256A (zh) * 2020-07-10 2020-10-23 的卢技术有限公司 一种基于精准测量的电池紧急断开系统及使用方法
CN113949032A (zh) * 2020-07-16 2022-01-18 上海汽车集团股份有限公司 高压回路的切断方法、控制器及高压系统
CN114792965A (zh) * 2021-01-25 2022-07-26 长城汽车股份有限公司 电池保护系统、电池保护方法和车辆
CN215300153U (zh) * 2021-03-19 2021-12-24 长城汽车股份有限公司 一种车辆高压回路及其车辆
CN114336879A (zh) * 2022-01-06 2022-04-12 广州小鹏汽车科技有限公司 电池电路、电池管理系统、电池模组及电动汽车
CN114851852A (zh) * 2022-06-08 2022-08-05 广州小鹏汽车科技有限公司 短路保护系统及电动交通工具的动力电池系统

Also Published As

Publication number Publication date
CN114851852A (zh) 2022-08-05

Similar Documents

Publication Publication Date Title
WO2023236451A1 (fr) Système de protection contre les courts-circuits, et système de batterie de traction de véhicule électrique
EP3734308B1 (fr) Circuit et procédé de détection d'emballement thermique
US20220055483A1 (en) First series then parallel battery pack system
US10703206B2 (en) Device for monitoring a high-voltage on-board power supply system of an electrically operated vehicle for the occurrence of overloading
US11081877B2 (en) Back-up overload protection scheme for solid state controller
US9746526B2 (en) Battery cell unit and method for determining a complex impedance of a battery cell arranged in a battery cell unit
WO2020220560A1 (fr) Circuit de détection d'emballement thermique
CN110673027A (zh) 一种低压断路器接头故障检测方法和装置
CN110445102B (zh) 一种电子继电器装置及保护方法
CN105676091A (zh) 一种电池组绝缘检测装置及其绝缘检测方法
US20200212507A1 (en) Electricity storage system and management device
KR20190108999A (ko) 통합형 스위칭 장치
WO2023221595A1 (fr) Système de diagnostic de défaillance de fonction de détection d'isolation de véhicule électrique, procédé et dispositif
WO2021253848A1 (fr) Circuit de protection de batterie, système de gestion de batterie, ainsi que dispositif de batterie et procédé de commande associé
CN115923586A (zh) 一种电池系统过电流保护方法及车辆
EP4123858A1 (fr) Système de gestion de batterie et procédé de surveillance de surintensité dans un système de gestion de batterie
CN113054624A (zh) 一种智能型低压电涌保护器专用断路器及其控制方法
JP7075412B2 (ja) 電力システムにおけるイベントの発生及びタイミングを検出するための方法及びシステム
KR20210111478A (ko) 배터리 관리 시스템 및 방법
CN100428603C (zh) 具有选择性保护组件的选择性开关
CN115871462A (zh) 一种电池系统的激励熔断保护方法及车辆
WO2019038553A1 (fr) Protection de sécurité de batterie
EP4328947A1 (fr) Procédé de protection contre les surcharges pour disjoncteur à semi-conducteurs, disjoncteur à semi-conducteurs et système de distribution d'énergie
CN113471931B (zh) 电源回路保护装置及方法
CN215934468U (zh) 一种智能型低压电涌保护器专用断路器

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22945579

Country of ref document: EP

Kind code of ref document: A1