Arc extinguishing circuit control method, device, terminal equipment and storage medium

Abstract

The present invention discloses a control method, device, terminal equipment and storage medium of an arc extinguishing circuit, wherein the control method comprises: when it is determined that the main circuit where the main positive contactor is located is abnormal, the main positive contactor is controlled to be turned off, and the shunt arc extinguishing module is controlled to be turned on; the first current value of the main circuit is detected, and when it is detected that the first current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module, it is determined that there is no arc in the main circuit, and the shunt arc extinguishing module is controlled to be turned off. The present invention presets a maximum shunt threshold of the shunt arc extinguishing module that can characterize whether there is an arc in the main positive contactor, and then compares the first current value of the main circuit with the maximum shunt threshold of the shunt arc extinguishing module, thereby determining whether there is an arc in the main circuit, thereby controlling the timing of shutting down the shunt arc extinguishing module; the accuracy of detecting the existence of an arc in the main circuit is improved, and the shunt arc extinguishing module is accurately controlled to be turned off, thereby achieving effective arc extinguishing of the main circuit.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a control method, device, terminal equipment and storage medium for an arc extinguishing circuit. Background Art

[0002] The BDU (Battery Energy Distribution Unit) inside new energy vehicles is a core component that controls battery power distribution and protects the battery pack. The BDU is composed of multiple independent components, which are connected by copper busbars and wiring harnesses. The main internal components include the main positive contactor, the main negative contactor, the pre-charge contactor, the pre-charge resistor, and the fuse. Whether the main positive and main negative contactors can work properly determines whether the battery pack can be charged and discharged normally. The platform of new energy vehicles is a high-voltage system. Directly switching the contactor will generate an arc, causing the contact points of the contactor to burn or stick, resulting in damage to the contactor.

[0003] In the prior art, the arc extinguishing circuit in the battery energy distribution unit is usually implemented by a pre-charging circuit. When the contactor is normally closed, it is pre-charged through the pre-charging circuit to reduce the voltage difference across the contactor and greatly reduce the arc generation when closed. However, in an abnormal state, that is, disconnection under a short circuit or overcurrent condition cannot protect the contactor, resulting in contact adhesion; or, when there is still an arc in the main circuit where the contactor is located, it is easy to shut down the pre-charging circuit in advance because it cannot accurately detect whether there is still an arc in the main circuit, and effective arc extinguishing is not achieved. Summary of the invention

[0004] The embodiments of the present invention provide a control method, device, terminal equipment and storage medium for an arc extinguishing circuit to solve the problem that the technology cannot accurately detect whether there is still an arc in the main circuit, resulting in premature shutdown of the pre-charging circuit and failure to achieve effective arc extinguishing.

[0005] In one embodiment, a control method for an arc extinguishing circuit is provided, wherein the arc extinguishing circuit comprises: a main positive contactor, a main negative contactor and a shunt arc extinguishing module, wherein the input end of the main positive contactor is used to connect the positive electrode of the battery, and the output end of the main positive contactor is used to connect the positive electrode of the load; the input end of the main negative contactor is used to connect the negative electrode of the load, and the output end of the main negative contactor is used to connect the negative electrode of the battery; the shunt arc extinguishing module is connected in parallel with the main positive contactor; the control method comprises:

[0006] When it is determined that the main circuit where the main positive contactor is located is abnormal, the main positive contactor is controlled to be turned off, and the shunt arc extinguishing module is controlled to be turned on;

[0007] The first current value of the main circuit is detected. When it is detected that the first current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module, it is determined that there is no arc in the main circuit, and the shunt arc extinguishing module is controlled to be shut down.

[0008] In one embodiment, before detecting that the current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module, the control method further includes:

[0009] Obtaining the terminal voltage of the battery and the equivalent resistance of the shunt arc extinguishing module;

[0010] The maximum shunt threshold of the shunt arc extinguishing module is determined according to the ratio of the terminal voltage of the battery to the equivalent resistance of the shunt arc extinguishing module.

[0011] In one embodiment, the control method further includes:

[0012] When the main circuit where the main positive contactor is located is normal and the main positive contactor is controlled to be turned off, a second current value of the main circuit is detected in real time;

[0013] Acquire the terminal voltage of the battery, and determine the equivalent resistance of the main circuit according to the ratio of the terminal voltage of the battery to the second current value of the main circuit;

[0014] The equivalent resistance of the main circuit is compared with the equivalent resistance of the shunt arc extinguishing module. When it is detected that the equivalent resistance of the main circuit increases and is greater than or equal to the equivalent resistance of the shunt arc extinguishing module, the shunt arc extinguishing module is controlled to be turned on.

[0015] In one embodiment, after controlling the shunt arc extinguishing module to be turned on, the control method further includes:

[0016] Detect the third current value of the main circuit. When it is detected that the third current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module, determine that there is no arc in the main circuit, and control the shunt arc extinguishing module to shut down.

[0017] In one embodiment, the shunt arc extinguishing module includes a pre-charging module and a shunt module, the pre-charging module includes a switch and a pre-charging resistor, the switch is connected in series with the pre-charging resistor, and the shunt module is connected in parallel with the pre-charging resistor;

[0018] Controlling the shunt arc extinguishing module to be turned on includes: controlling the switch to be closed to turn on the pre-charging module and the shunt module to shunt the current flowing through the main positive contactor.

[0019] In one embodiment, the shunt module includes at least one PTC resistor, and the resistance value of the PTC resistor in a cold state ranges from 10 mΩ to 10 Ω.

[0020] In one embodiment, the shunt module includes a first heater module and a second heater module, the first heater module and the second heater module are connected in series, at least one PTC resistor is provided in the first heater module, and at least one PTC resistor is provided in the second heater module.

[0021] In one embodiment, a control device for an arc extinguishing circuit is provided, wherein the arc extinguishing circuit comprises: a main positive contactor, a main negative contactor and a shunt arc extinguishing module, wherein the input end of the main positive contactor is used to connect the positive electrode of the battery, and the output end of the main positive contactor is used to connect the positive electrode of the load; the input end of the main negative contactor is used to connect the negative electrode of the load, and the output end of the main negative contactor is used to connect the negative electrode of the battery; the shunt arc extinguishing module is connected in parallel with the main positive contactor; the control device comprises:

[0022] A judgment control module, used for controlling the main positive contactor to be turned off and the shunt arc extinguishing module to be turned on when it is determined that the main circuit where the main positive contactor is located is abnormal;

[0023] A current detection module, used to detect a first current value of the main circuit;

[0024] The comparison control module is used to determine that there is no arc in the main circuit and control the shunt arc extinguishing module to shut down when it is detected that the first current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module.

[0025] In one embodiment, a terminal device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned control method when executing the computer program.

[0026] In one embodiment, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and the computer program implements the above control method when executed by a processor.

[0027] The control method, device, terminal equipment and storage medium of the arc extinguishing circuit above control the main positive contactor of the arc extinguishing circuit to shut down and control the shunt arc extinguishing module to turn on. Then, a maximum shunt threshold of the shunt arc extinguishing module that can characterize whether there is an arc in the main positive contactor is preset, and then the first current value of the main circuit and the maximum shunt threshold of the shunt arc extinguishing module are compared to determine whether there is an arc in the main circuit, thereby controlling the timing of shutting down the shunt arc extinguishing module; the accuracy of detecting the presence of an arc in the main circuit is improved, and the shunt arc extinguishing module is accurately controlled to shut down, thereby achieving effective arc extinguishing of the main circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0029] Figure 1 is a schematic diagram of an arc extinguishing circuit in an embodiment of the present invention;

[0030] Figure 2 is a flow chart of a control method of an arc extinguishing circuit in one embodiment of the present invention;

[0031] Figure 3 is another flow chart of a method for controlling an arc extinguishing circuit in one embodiment of the present invention;

[0032] Figure 4 is another schematic diagram of an arc extinguishing circuit in one embodiment of the present invention;

[0033] Figure 5 is a curve diagram showing the relationship between the resistance value and temperature of a PTC resistor in one embodiment of the present invention;

[0034] Figure 6 is another schematic diagram of an arc extinguishing circuit in one embodiment of the present invention;

[0035] Figure 7 is a schematic diagram of a control device for an arc extinguishing circuit in one embodiment of the present invention;

[0036] Figure 8 It is a schematic diagram of a terminal device in one embodiment of the present invention.

[0037] Explanation of symbols:

[0038] 31. A first heater module; 32. A second heater module. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In one embodiment, a control method for an arc extinguishing circuit is provided, and the method is described by taking the application of the method in a battery energy distribution unit of a new energy vehicle as an example. Figure 1 As shown, the arc extinguishing circuit includes: a main positive contactor, a main negative contactor and a shunt arc extinguishing module, wherein the input end of the main positive contactor is used to connect the positive electrode of the battery, and the output end of the main positive contactor is used to connect the positive electrode of the load; the input end of the main negative contactor is used to connect the negative electrode of the load, and the output end of the main negative contactor is used to connect the negative electrode of the battery; the shunt arc extinguishing module is connected in parallel with the main positive contactor; Figure 2 As shown, the control method comprises the following steps:

[0041] S101, when it is determined that the main circuit where the main positive contactor is located is abnormal, the main positive contactor is controlled to be turned off, and the shunt arc extinguishing module is controlled to be turned on;

[0042] Among them, you can set Figure 1 The current detection module at the output end of the main positive contactor and the shunt arc extinguishing module detects the main circuit current where the main positive contactor is located, and sends the main circuit current to the controller. When the controller determines that the main circuit has an overcurrent or short circuit fault based on the main circuit current, it will send a "disconnect" control signal to the main positive contactor to control the main positive contactor to shut down; and send a "conduction" signal to the switch of the parallel shunt arc extinguishing module to control the shunt arc extinguishing module to turn on.

[0043] S102, detecting a first current value of the main circuit, and when detecting that the first current value of the main circuit is less than or equal to a maximum shunt threshold value of the shunt arc extinguishing module, determining that no arc exists in the main circuit, and controlling the shunt arc extinguishing module to shut down.

[0044] When the main positive contactor is disconnected, an arc will be generated. After the switch in the shunt arc extinguishing module is closed, the shunt arc extinguishing module is turned on, and the shunt arc extinguishing module is used to shunt the current to achieve the operation of arc initiation and arc extinguishing. Specifically, when the shunt arc extinguishing module is turned on and the main positive contactor is turned off, the shunt arc extinguishing module is turned on and the arc initiation and arc extinguishing are achieved. Figure 1The current detection module at the output end of the main positive contactor and the shunt arc extinguishing module detects the main circuit current again, records it as a first current value, and sends the first current value to the controller. The controller compares the first current value of the main circuit with the maximum shunt threshold of the shunt arc extinguishing module. When it is detected that the first current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module, it is determined that there is no arc in the main circuit, thereby controlling the shunt arc extinguishing module to shut down.

[0045] In this step, the maximum shunt threshold of the shunt arc extinguishing module refers to the theoretical value of the current flowing through the shunt arc extinguishing module when there is no arc when the main positive contactor is disconnected and the shunt arc extinguishing module is turned on. If the first current value is greater than the theoretical current value, it means that there is still an arc after the main positive contactor is disconnected, and the first current value greater than the theoretical current value is obtained by superimposing the current output by the main positive contactor and the current output by the shunt arc extinguishing module.

[0046] In other embodiments, in order to further improve the accuracy of the timing of determining whether the shunt arc extinguishing module is shut down, after determining for the first time that there is no arc in the main circuit, the software can also detect whether there is an arc signal (i.e., the current signal or voltage signal of the arc). If not, a second determination is made that there is no arc in the main circuit, and then the shunt arc extinguishing module is controlled to shut down; if the software detects that there is still an arc signal in the main circuit, it means that there is still an arc, and the shunt arc extinguishing module is controlled to continue working.

[0047] The control method of the arc extinguishing circuit of the present embodiment, after controlling the main positive contactor of the arc extinguishing circuit to shut down and controlling the shunt arc extinguishing module to turn on, presets a maximum shunt threshold of the shunt arc extinguishing module that can characterize whether there is an arc in the main positive contactor, and then compares the first current value of the main circuit with the maximum shunt threshold of the shunt arc extinguishing module, thereby determining whether there is an arc in the main circuit, thereby controlling the timing of shutting down the shunt arc extinguishing module; the accuracy of detecting the presence of an arc in the main circuit is improved, and the shunt arc extinguishing module is accurately controlled to shut down, thereby achieving effective arc extinguishing of the main circuit.

[0048] In one embodiment, before detecting that the current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module, the control method further includes:

[0049] S201, obtaining the terminal voltage of the battery and the equivalent resistance of the shunt arc extinguishing module;

[0050] The equivalent resistance of the shunt arc extinguishing module refers to the equivalent resistance calculated according to the circuit structure of the shunt arc extinguishing module.

[0051] S202, determining a maximum shunt threshold of the shunt arc extinguishing module according to a ratio of the terminal voltage of the battery to the equivalent resistance of the shunt arc extinguishing module.

[0052] Among them, since the resistance of the arc extinguishing module is fixed, the corresponding current flowing through it is fixed. For example, when Figure 1 The voltage of the battery connected in series in the main circuit of the arc extinguishing circuit is 900V, and the resistance of the arc extinguishing module is 10Ω. When there is no arc in the main circuit, the current distributed by the arc extinguishing module is 90A. If the first current value measured by the current detection module is ≤90A, it is determined that the main positive contactor has been completely disconnected and there is no arc in the main circuit.

[0053] In one embodiment, considering the arc extinguishing efficiency of the main positive contactor after normal shutdown, such as Figure 3 As shown, the control method also includes:

[0054] S301, when the main circuit where the main positive contactor is located is normal and the main positive contactor is controlled to be turned off, a second current value of the main circuit is detected in real time;

[0055] S302, obtaining a terminal voltage of the battery, and determining an equivalent resistance of the main circuit according to a ratio of the terminal voltage of the battery to a second current value of the main circuit;

[0056] S303, comparing the equivalent resistance of the main circuit and the equivalent resistance of the shunt arc extinguishing module, and when it is detected that the equivalent resistance of the main circuit increases and is greater than or equal to the equivalent resistance of the shunt arc extinguishing module, controlling the shunt arc extinguishing module to be turned on.

[0057] Among them, when the main positive contactor is disconnected normally, due to the large arc intensity, the corresponding resistance is very small. Even if the shunt arc extinguishing module is turned on, the module will not be able to play the shunt arc extinguishing role because its resistance is greater than that of the main positive contactor; and the current detection module continues to detect the second current value of the loop. As the contacts of the main positive contactor separate, the loop current gradually decreases, the arc energy will also gradually decrease, and the corresponding resistance will gradually increase. When the resistance increases to a level greater than that of the shunt arc extinguishing module, the shunt arc extinguishing module is turned on to speed up the completion of arc extinguishing.

[0058] The control method of the arc extinguishing circuit of the present embodiment is not only applicable to disconnecting the main positive contactor to extinguish the arc under abnormal conditions, but also applicable to opening the main positive contactor during the last short period of arc extinguishing when the main positive contactor is disconnected normally, so as to complete the arc extinguishing in advance and improve the arc extinguishing efficiency.

[0059] In one embodiment, after controlling the shunt arc extinguishing module to be turned on in step S303, the control method further includes:

[0060] S304, detecting the third current value of the main circuit. When it is detected that the third current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module, it is determined that there is no arc in the main circuit, and the shunt arc extinguishing module is controlled to shut down.

[0061] The maximum shunt threshold of the shunt arc extinguishing module preset in step S304 is the same as the maximum shunt threshold of the shunt arc extinguishing module in step S102.

[0062] In one embodiment, if Figure 1 As shown, the shunt arc extinguishing module includes a pre-charging module and a shunt module, the pre-charging module includes a switch and a pre-charging resistor, the switch is connected in series with the pre-charging resistor, and the shunt module is connected in parallel with the pre-charging resistor; controlling the conduction of the shunt arc extinguishing module includes: controlling the switch to close to conduct the pre-charging module and the shunt module to shunt the current flowing through the main positive contactor.

[0063] The equivalent resistance of the shunt arc extinguishing module in step S201 refers to the equivalent resistance of the shunt module and the pre-charging resistor connected in parallel, calculated according to the circuit structure of the shunt arc extinguishing module.

[0064] The working principle of the arc extinguishing circuit is:

[0065] Before closing the main positive contactor, the pre-charging module is turned on to increase the voltage across the main positive contactor through pre-charging, so as to greatly reduce the energy of the generated arc and play a pre-charging role. When the main positive contactor is disconnected, the pre-charging module and the shunt module of the shunt arc extinguishing module are controlled to be turned on at the same time, so that the pre-charging module and the shunt module shunt the current on the main positive contactor at the same time.

[0066] The arc extinguishing circuit of this embodiment is aimed at the arc extinguishing process when the main positive contactor is disconnected. When the main positive contactor is disconnected under high voltage and high current conditions or abnormal conditions, two pre-charging modules and shunt modules for arc extinguishing are set in the shunt arc extinguishing module to further reduce the total resistance of the branch, so that the two branches can receive more current. Correspondingly, the current of the main circuit is small, and the resistance of the main circuit becomes larger. Since the arc energy is inversely proportional to the resistance, the arc energy of the main circuit will become smaller, which meets the arc initiation and arc extinguishing requirements under high voltage and high current or abnormal conditions, shortens the arc extinguishing time, and speeds up the arc extinguishing speed.

[0067] In this embodiment, the resistance value of the pre-charging resistor is set to be fixed, and the current flowing through the branch where the pre-charging module is located is fixed. When the contactor is disconnected in an abnormal state, the current of the main circuit (i.e., the circuit where the main contactor is located) is too large. At this time, the pre-charging module is turned on for shunting, the current of the main circuit will decrease, and the corresponding resistance of the main circuit will increase. According to the above content, the greater the resistance, the smaller the energy intensity of the arc, and the arc initiation and arc extinguishing operations can be completed by parallel pre-charging modules.

[0068] Considering that if the voltage output by the battery is very high, the corresponding abnormal current will be particularly large under abnormal conditions, assuming that the resistance value of the pre-charging resistor remains unchanged, the battery voltage is increased to 1500V, and the branch current can be 75A. At this time, the arc-starting and arc-extinguishing effect of the pre-charging resistor connected in parallel with the main positive contactor is greatly weakened, and the contacts will be damaged by arc erosion for a long time. The contactor cannot be modified in structure to improve the arc-extinguishing effect. First, as the voltage increases, the number of corresponding arc-extinguishing grid layers must increase, but the range of the permanent magnet arc blowing is limited. Even if the opening angle of the arc-starting plate is increased, the arc blowing range cannot be expanded. If the structure is to meet the arc-extinguishing effect, the corresponding contactor is very large and the cost is higher.

[0069] Therefore, in order to save costs, while keeping the existing structure of the contactor unchanged, the arc problem of disconnecting the contactor when the high voltage is abnormal is solved by connecting a shunt module in parallel at both ends of the pre-charging resistor, so as to achieve the effect of rapid arc extinguishing.

[0070] In one embodiment, the shunt module includes at least one PTC resistor, and the resistance value of the PTC resistor in a cold state ranges from 10 mΩ to 10 Ω.

[0071] like Figure 4 As shown, after the PTC resistor is connected in parallel at both ends of the pre-charging resistor R, the overall resistance of the shunt arc extinguishing module is reduced, the current divided by the branch of the shunt arc extinguishing module is increased, the current of the main circuit (the circuit where the main positive contactor K1 is located) is smaller, the resistance is smaller, and the energy intensity of the arc is lower, that is, the contacts can extinguish the arc faster.

[0072] For example, assuming that after the PTC resistor is connected in parallel, the overall resistance value of the shunt arc extinguishing module is 5Ω, and the voltage value is 1500V, the corresponding branch current is 300A. Then, under abnormal conditions, the arc can be completely extinguished when the current drops to 300A, which is earlier than when the PTC resistor is not connected in parallel. This can prevent the contacts from being burned by the arc for a long time, thereby improving the safety and reliability of the contactor.

[0073] like Figure 5 The relationship curve between the resistance value and temperature of the PTC resistor shown in the figure shows that the shunt module needs to be opened to complete the arc extinguishing within the cold range of the PTC resistor (such as room temperature). The resistance value of the PTC resistor in this range is very small and hardly changes with temperature, so the arc can be effectively extinguished. Otherwise, a large current flowing through the PTC resistor for a long time will cause the PTC resistor to heat up and increase the internal resistance, which will be meaningless for arc extinguishing. In addition, the arc extinguishing circuit of this embodiment is suitable for disconnecting the contactor to extinguish the arc under abnormal conditions, and can also be used when it is normally disconnected, and opened in the last short period of time of arc extinguishing to complete the arc extinguishing in advance.

[0074] The arc extinguishing circuit of this embodiment connects a PTC resistor in parallel at both ends of the pre-charging resistor to start an arc, thereby reducing the current flowing through the main circuit, so that the arc can be quickly extinguished when the main positive contactor is disconnected, thereby improving the reliability of the contactor. This method can not only meet the requirement of quickly extinguishing the arc when the contactor is disconnected under a high-voltage platform of hundreds of volts or thousands of volts, but also does not require changing the existing structure, and is low in cost.

[0075] In one embodiment, if Figure 6 As shown, the shunt module includes a first heater module 31 and a second heater module 32 , the first heater module 31 and the second heater module 32 are connected in series, at least one PTC resistor is set in the first heater module 31 , and at least one PTC resistor is set in the second heater module 32 .

[0076] The specific number and connection method of the PTC resistors are determined by parameters such as the actual voltage, the pre-charge resistance, the main circuit current value, and the expected disconnection time.

[0077] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0078] In one embodiment, a control device for an arc extinguishing circuit is provided, and the control device corresponds one-to-one with the control method for the arc extinguishing circuit in the above embodiment. The arc extinguishing circuit includes: a main positive contactor, a main negative contactor and a shunt arc extinguishing module, wherein the input end of the main positive contactor is used to connect to the positive pole of the battery, and the output end of the main positive contactor is used to connect to the positive pole of the load; the input end of the main negative contactor is used to connect to the negative pole of the load, and the output end of the main negative contactor is used to connect to the negative pole of the battery; the shunt arc extinguishing module is connected in parallel with the main positive contactor. Figure 7 As shown, the control device includes a judgment control module 71, a first current detection module 72, and a comparison control module 73. The functional modules are described in detail as follows:

[0079] A judgment control module 71, used for controlling the main positive contactor to be turned off and the shunt arc extinguishing module to be turned on when it is determined that the main circuit where the main positive contactor is located is abnormal;

[0080] A first current detection module 72, used to detect a first current value of the main circuit;

[0081] The comparison control module 73 is used to determine that there is no arc in the main circuit and control the shunt arc extinguishing module to shut down when it is detected that the first current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module.

[0082] In one embodiment, the control device further includes:

[0083] An acquisition module, used for acquiring the terminal voltage of the battery and the equivalent resistance of the shunt arc extinguishing module;

[0084] The first calculation module is used to determine the maximum shunt threshold of the shunt arc extinguishing module according to the ratio of the terminal voltage of the battery to the equivalent resistance of the shunt arc extinguishing module.

[0085] In one embodiment, the control device further includes:

[0086] A second current detection module is used to detect a second current value of the main circuit in real time when the main circuit where the main positive contactor is located is normal and the main positive contactor is controlled to be turned off;

[0087] a second calculation module, configured to obtain a terminal voltage of the battery, and determine an equivalent resistance of the main circuit according to a ratio of the terminal voltage of the battery to a second current value of the main circuit;

[0088] A comparison control module is used to compare the equivalent resistance of the main circuit with the equivalent resistance of the shunt arc extinguishing module, and when it is detected that the equivalent resistance of the main circuit increases and is greater than or equal to the equivalent resistance of the shunt arc extinguishing module, the shunt arc extinguishing module is controlled to be turned on.

[0089] In one embodiment, the control device further includes:

[0090] The current detection control module is used to detect the third current value of the main circuit. When it is detected that the third current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module, it is determined that there is no arc in the main circuit and the shunt arc extinguishing module is controlled to shut down.

[0091] For the specific definition of the control device, please refer to the definition of the control method above, which will not be repeated here. Each module in the above control device can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0092] In one embodiment, Figure 8 This is a schematic diagram of the structure of a terminal device (computer device) provided in Embodiment 4 of the present invention. Figure 8 As shown, the terminal device of this embodiment includes: at least one processor ( Figure 8 Only one is shown in the figure), a memory, and a computer program stored in the memory and executable on at least one processor, wherein when the processor executes the computer program, the steps of any of the above-mentioned control method embodiments are implemented.

[0093] The computer device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that Figure 8 This is merely an example of a computer device and does not constitute a limitation on the computer device. The computer device may include more or fewer components than those shown in the figure, or a combination of certain components, or different components. For example, it may also include a network interface, a display screen, and an input device.

[0094] The processor may be a CPU, or other general-purpose processors, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0095] The memory includes a readable storage medium, an internal memory, etc., wherein the internal memory may be the memory of a computer device, and the internal memory provides an environment for the operation of the operating system and computer-readable instructions in the readable storage medium. The readable storage medium may be a hard disk of a computer device, and in other embodiments, it may also be an external storage device of the computer device, for example, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the computer device. Further, the memory may also include both an internal storage unit of the computer device and an external storage device. The memory is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as the program code of a computer program, etc. The memory may also be used to temporarily store data that has been output or is to be output.

[0096] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention. The specific working process of the units and modules in the above-mentioned device can refer to the corresponding process in the above-mentioned method embodiment, which will not be repeated here. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned method embodiment can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device capable of carrying computer program code, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0097] The present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by a computer program product. When the computer program product runs on a computer device, the computer device can implement the steps in the above-mentioned method embodiment when executing.

[0098] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0099] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the control method in the above embodiment is implemented, for example Figure 2 Steps S101-S102 shown, or Figure 3 To avoid repetition, the steps S301 to S303 are not described here. Alternatively, when the computer program is executed by the processor, the functions of each module / unit in the embodiment of the control device are realized, for example Figure 7 The arc extinguishing control function shown will not be described here in detail to avoid repetition.

[0100] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0101] The present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by a computer program product. When the computer program product runs on a computer device, the computer device can implement the steps in the above-mentioned method embodiment when executing.

[0102] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0103] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0104] In the embodiments provided by the present invention, it should be understood that the disclosed devices / computer equipment and methods can be implemented in other ways. For example, the device / computer equipment embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0105] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0106] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A control method for an arc extinguishing circuit, characterized in that: The arc extinguishing circuit comprises: a main positive contactor, a main negative contactor and a shunt arc extinguishing module, wherein the input end of the main positive contactor is used to connect the positive electrode of the battery, and the output end of the main positive contactor is used to connect the positive electrode of the load; the input end of the main negative contactor is used to connect the negative electrode of the load, and the output end of the main negative contactor is used to connect the negative electrode of the battery; the shunt arc extinguishing module is connected in parallel with the main positive contactor; the control method comprises: When it is determined that the main circuit where the main positive contactor is located is abnormal, the main positive contactor is controlled to be turned off, and the shunt arc extinguishing module is controlled to be turned on; Detecting a first current value of the main circuit, and when detecting that the first current value of the main circuit is less than or equal to a maximum shunt threshold of the shunt arc extinguishing module, determining that there is no arc in the main circuit, and controlling the shunt arc extinguishing module to shut down; The control method further comprises: When the main circuit where the main positive contactor is located is normal and the main positive contactor is controlled to be turned off, a second current value of the main circuit is detected in real time; Acquire the terminal voltage of the battery, and determine the equivalent resistance of the main circuit according to the ratio of the terminal voltage of the battery to the second current value of the main circuit; Comparing the equivalent resistance of the main circuit with the equivalent resistance of the shunt arc extinguishing module, when it is detected that the equivalent resistance of the main circuit increases and is greater than or equal to the equivalent resistance of the shunt arc extinguishing module, controlling the shunt arc extinguishing module to be turned on; After controlling the shunt arc extinguishing module to be turned on, the control method further includes: Detect the third current value of the main circuit. When it is detected that the third current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module, determine that there is no arc in the main circuit, and control the shunt arc extinguishing module to shut down.

2. The control method according to claim 1, characterized in that: Before detecting that the current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module, the control method further includes: Obtaining the terminal voltage of the battery and the equivalent resistance of the shunt arc extinguishing module; The maximum shunt threshold of the shunt arc extinguishing module is determined according to the ratio of the terminal voltage of the battery to the equivalent resistance of the shunt arc extinguishing module.

3. The control method according to claim 1, characterized in that: The shunt arc extinguishing module includes a pre-charging module and a shunt module, the pre-charging module includes a switch and a pre-charging resistor, the switch is connected in series with the pre-charging resistor, and the shunt module is connected in parallel with the pre-charging resistor; Controlling the shunt arc extinguishing module to be turned on includes: controlling the switch to be closed to turn on the pre-charging module and the shunt module to shunt the current flowing through the main positive contactor.

4. The control method according to claim 3, characterized in that: The shunt module includes at least one PTC resistor, and the resistance value of the PTC resistor in a cold state ranges from 10 mΩ to 10 Ω.

5. The control method according to claim 4, characterized in that: The shunt module includes a first heater module and a second heater module. The first heater module and the second heater module are connected in series. At least one PTC resistor is provided in the first heater module, and at least one PTC resistor is provided in the second heater module.

6. A control device for an arc extinguishing circuit, characterized in that: The arc extinguishing circuit comprises: a main positive contactor, a main negative contactor and a shunt arc extinguishing module, wherein the input end of the main positive contactor is used to connect the positive electrode of the battery, and the output end of the main positive contactor is used to connect the positive electrode of the load; the input end of the main negative contactor is used to connect the negative electrode of the load, and the output end of the main negative contactor is used to connect the negative electrode of the battery; the shunt arc extinguishing module is connected in parallel with the main positive contactor; the control device comprises: A judgment control module, used for controlling the main positive contactor to be turned off and the shunt arc extinguishing module to be turned on when it is determined that the main circuit where the main positive contactor is located is abnormal; A first current detection module, used to detect a first current value of the main loop; A first comparison control module is used to determine that there is no arc in the main circuit and control the shunt arc extinguishing module to shut down when it is detected that the first current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module; A second current detection module is used to detect a second current value of the main circuit in real time when the main circuit where the main positive contactor is located is normal and the main positive contactor is controlled to be turned off; a second calculation module, configured to obtain a terminal voltage of the battery, and determine an equivalent resistance of the main circuit according to a ratio of the terminal voltage of the battery to a second current value of the main circuit; A second comparison control module is used to compare the equivalent resistance of the main circuit with the equivalent resistance of the shunt arc extinguishing module, and when it is detected that the equivalent resistance of the main circuit increases and is greater than or equal to the equivalent resistance of the shunt arc extinguishing module, control the shunt arc extinguishing module to be turned on; The current detection control module is used to detect the third current value of the main circuit. When it is detected that the third current value of the main circuit is less than or equal to the maximum shunt threshold of the shunt arc extinguishing module, it is determined that there is no arc in the main circuit and the shunt arc extinguishing module is controlled to shut down.

7. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the control method according to any one of claims 1 to 3 is implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the control method according to any one of claims 1 to 3 is implemented.

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