CN113949032A - High-voltage circuit cutting method, controller and high-voltage system - Google Patents

High-voltage circuit cutting method, controller and high-voltage system Download PDF

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Publication number
CN113949032A
CN113949032A CN202010688192.5A CN202010688192A CN113949032A CN 113949032 A CN113949032 A CN 113949032A CN 202010688192 A CN202010688192 A CN 202010688192A CN 113949032 A CN113949032 A CN 113949032A
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CN
China
Prior art keywords
current
voltage
relay
fuse
voltage circuit
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Pending
Application number
CN202010688192.5A
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Chinese (zh)
Inventor
陆珂伟
李骥
赵小巍
林美爱
郭艳青
王慧洁
许慧杰
刘蒙蒙
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SAIC Motor Corp Ltd
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SAIC Motor Corp Ltd
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Priority to CN202010688192.5A priority Critical patent/CN113949032A/en
Publication of CN113949032A publication Critical patent/CN113949032A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/549—Current
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The embodiment of the application provides a method for cutting off a high-voltage circuit, a controller of the high-voltage circuit, a high-voltage system and a computer storage medium. The method comprises the following steps: when the high-voltage loop enters an emergency state from a working state, acquiring a current value obtained by sampling the current of the high-voltage loop; when the current value is smaller than or equal to the first current threshold value, controlling to cut off the high-voltage loop; when the current value is larger than the first current threshold value, if the heat is larger than the heat threshold value, the fuse wire in the traditional fuse is fused to cut off the high-voltage loop. According to the method and the device, after the high-voltage circuit enters the emergency state from the working state, the current value obtained by sampling the current of the high-voltage circuit is obtained, when the current value is compared with the first current threshold value, the accuracy of the comparison result is improved, different high-voltage circuit cutting schemes are adopted according to the comparison result, the cutting of the fuse wire in the high-voltage circuit or the traditional fuse is controlled, the high-voltage circuit is cut off in a grading mode, and the high-voltage circuit can be cut off quickly and effectively.

Description

High-voltage circuit cutting method, controller and high-voltage system
Technical Field
The embodiment of the application relates to the technical field of electronic information, in particular to a method for cutting off a high-voltage circuit, a controller of the high-voltage circuit, a high-voltage system and a computer storage medium.
Background
A Battery Management System (BMS) of an electric vehicle is an important System for controlling a power Battery of the electric vehicle. The BMS realizes the disconnection and connection of a high-voltage system by controlling the disconnection and the connection of a relay, thereby meeting the power-on and power-off requests of the VCU and controlling the normal work of the high-voltage system of the electric automobile.
Typically, the BMS utilizes conventional fuses and relays in conjunction to control the on/off of the entire high voltage circuit. In an application scenario, a high-voltage short circuit occurs outside a battery pack, a short-circuit current is too large, at the moment, a BMS controls a relay contact to be disconnected, however, due to the fact that the current is too large, the contact is easy to adhere due to the cutting-off action, a relay in one situation is not disconnected when being cut off, the adhesion occurs, a relay in the other situation does not start the cutting-off action, and the static fusion welding adhesion occurs due to the fact that the current is too large. The relatively big resistance that shows behind the relay adhesion can reduce short-circuit current, in case the electric current is less than the fusing power of traditional fuse, can't accumulate certain heat for traditional fuse can't be blown passively, then whole high-voltage circuit can't cut off, appears the battery overdischarge in the short time easily, causes the thermal runaway, causes the potential safety hazard. Therefore, it is necessary to provide a method for cutting off a high-voltage circuit, so as to overcome the potential safety hazard that when a large current occurs due to an instantaneous short circuit, a relay and a conventional fuse cannot be completely matched, and the on-off of the high-voltage circuit cannot be rapidly and effectively controlled.
Disclosure of Invention
In view of the above, one of the technical problems solved by the embodiments of the present invention is to provide a method for cutting off a high voltage loop, a controller for a high voltage loop, a high voltage system and a computer storage medium, which are used to overcome the defect that the on/off of a high voltage loop cannot be controlled effectively and quickly when a large current occurs due to an instantaneous short circuit in the prior art.
In a first aspect, an embodiment of the present application provides a method for disconnecting a high-voltage circuit, where the method includes:
when the high-voltage loop enters an emergency state from a working state, acquiring a current value obtained by sampling the current of the high-voltage loop;
when the current value is smaller than or equal to a first current threshold value, controlling to cut off the high-voltage loop;
and when the current value is greater than the first current threshold value, if the heat is greater than the heat threshold value, the fuse wire in the conventional fuse is fused to cut off the high-voltage loop, and the conventional fuse is connected in series in the high-voltage loop.
Optionally, in an embodiment of the present application, when the current value is less than or equal to a first current threshold, controlling to cut off the high voltage circuit includes:
when the current value is greater than or equal to a second current threshold value and less than or equal to the first current threshold value, triggering a gunpowder detonating device in an active fuse to cut off the high-voltage circuit, wherein the active fuse is connected in series in the high-voltage circuit, and the second current threshold value is less than the first current threshold value.
Optionally, in an embodiment of the present application, when the current value is less than or equal to a first current threshold, controlling to cut off the high voltage circuit includes:
and when the current value is smaller than a second current threshold value, controlling a relay of the high-voltage circuit to be disconnected and cutting off the high-voltage circuit, wherein the second current threshold value is smaller than the first current threshold value.
Optionally, in an embodiment of the present application, controlling the opening of the relay of the high voltage circuit includes:
when the high-voltage loop is a discharging loop, a main negative relay and a main positive relay are controlled to be disconnected, and the main negative relay and the main positive relay are connected in the high-voltage loop in series;
when the high-voltage loop is a charging loop, a quick charging negative relay and a quick charging positive relay are controlled to be disconnected, and the quick charging negative relay and the quick charging positive relay are connected in series in the high-voltage loop;
the relay comprises the main negative relay, the main positive relay, the quick charge negative relay and the quick charge positive relay.
Optionally, in an embodiment of the present application, the method further includes: and if the fuse wire in the traditional fuse fails to fuse or the control relay fails to open, triggering a gunpowder detonating device in the active fuse to cut off the high-voltage loop.
Optionally, in an embodiment of the present application, the method further includes: counting the detonation times of triggering the active fuse, and generating abnormal alarm information when the detonation times is greater than or equal to a detonation threshold value.
Optionally, in an embodiment of the present application, the method further includes: when the high-voltage loop enters an emergency state from a working state, storing data related to the emergency state in a local memory;
and transmits data relating to the high-pressure circuit to the outside.
Optionally, in an embodiment of the present application, the method further includes: the high-voltage circuit enters an emergency state from an operating state when at least one of the following occurs: collision of the whole vehicle, insulation warning and overcurrent alarm signals.
In a second aspect, an embodiment of the present application provides a controller for a high-voltage circuit, including: an acquisition module and a cutting module;
when the high-voltage loop enters an emergency state from a working state, the acquisition module is used for acquiring a current value obtained by sampling the current of the high-voltage loop;
the cutting-off module is used for controlling cutting off the high-voltage loop when the current value is smaller than or equal to a first current threshold value, and when the current value is larger than the first current threshold value, if the heat is larger than a heat threshold value, a fuse wire in a traditional fuse is fused to cut off the high-voltage loop, and the traditional fuse is connected in the high-voltage loop in series.
In a third aspect, an embodiment of the present application provides a high voltage system, including: a current collector, a battery pack, a cut-off module, a conventional fuse, and a controller as described in any embodiment of the second aspect or the second aspect;
the traditional fuse, the cutting module and the current collector are connected in series and then connected between the anode and the cathode of the battery pack, and the current collector sends the collected current value to the controller;
the cutting module is electrically connected with the controller; for implementing a method as described in the first aspect or any embodiment of the first aspect.
In a fourth aspect, embodiments of the present application provide a computer storage medium storing a computer program, which when executed by a processor implements the method as described in the first aspect or any embodiment of the first aspect.
The embodiment of the application provides a method for cutting off a high-voltage circuit, a controller of the high-voltage circuit, a high-voltage system and a computer storage medium. The method for cutting off the high-voltage circuit comprises the following steps: when the high-voltage loop enters an emergency state from a working state, acquiring a current value obtained by sampling the current of the high-voltage loop; when the current value is smaller than or equal to the first current threshold value, controlling to cut off the high-voltage loop; when the current value is larger than the first current threshold value, if the heat is larger than the heat threshold value, the fuse wire in the traditional fuse is fused to cut off the high-voltage loop, and the traditional fuse is connected in series in the high-voltage loop. The method has the advantages that after the high-voltage circuit enters the emergency state from the working state, the current value obtained by sampling the current of the high-voltage circuit is obtained, the timeliness of the current value is guaranteed, when the current value is compared with the first current threshold value, the accuracy of the comparison result can be improved, different high-voltage circuit cutting schemes are adopted according to the comparison result, the fuse wire fusing in the high-voltage circuit or the traditional fuse is controlled to be cut off, the high-voltage circuit is cut off in a grading mode, compared with a single cutting method, the high-voltage circuit can be cut off rapidly and effectively, and the safety of the high-voltage circuit is guaranteed.
Drawings
Some specific embodiments of the present application will be described in detail below by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a flowchart of a method for disconnecting a high-voltage circuit according to an embodiment of the present disclosure;
fig. 2 is a flow chart for cutting off a high-voltage circuit in a grading manner according to an embodiment of the present application;
fig. 3 is a controller of a high-voltage circuit according to an embodiment of the present disclosure;
FIG. 4 is a block diagram of a high voltage system provided by an embodiment of the present application;
FIG. 5 is a block diagram of another high voltage system provided by an embodiment of the present application;
FIG. 6 is a block diagram of yet another high voltage system provided by an embodiment of the present application;
fig. 7 is a block diagram of an electrical integrated system according to an embodiment of the present application.
Detailed Description
The following further describes specific implementation of the embodiments of the present invention with reference to the drawings.
Example one
Fig. 1 is a flowchart of a method for cutting off a high-voltage circuit according to an embodiment of the present invention, and as shown in fig. 1, the method for cutting off a high-voltage circuit includes the following steps:
step 101, when the high-voltage loop enters an emergency state from a working state, acquiring a current value obtained by sampling current of the high-voltage loop.
The method includes the steps of obtaining a current value obtained by sampling a current of a high-voltage loop through a current sensor, wherein the current sensor is connected in the high-voltage loop in series, and can periodically or in real time output the collected current value. This current sensor can be the shunt, also can be hall current sensor, also can be other devices that can gather the circuit current, be the current value in gathering high-voltage circuit through the shunt in this application, when high-voltage circuit is in normal condition, the shunt samples with the electric current in normal sampling rate to high-voltage circuit, after high-voltage circuit gets into emergency by normal condition, the shunt samples with the electric current in quick sampling rate to high-voltage circuit, can reduce the time of obtaining the current value, thereby the break-make of high-efficient quick control high-voltage circuit. The current value of the high-voltage circuit is obtained by sampling the current of the high-voltage circuit after the high-voltage circuit enters the emergency state from the working state, so that the timeliness of the current value is guaranteed, and the accuracy of the comparison result between the current value and the current threshold value is improved.
Optionally, in an embodiment of the present application, the high-voltage circuit enters the emergency state from the operating state when at least one of the following occurs: collision of the whole vehicle, insulation warning and overcurrent alarm signals.
After the whole vehicle collides, some high-voltage wire harnesses are extruded and cut off, so that short circuit occurs instantly, and the current value is overlarge. The current sensor not only collects the current value in the high-voltage loop in real time or periodically, but also provides a real-time overcurrent alarm signal through a hard wire.
And 102a, when the current value is less than or equal to the first current threshold value, controlling to cut off the high-voltage loop.
In the present application, the obtained current value is further compared with a preset threshold, when the current value is less than or equal to the first current threshold, the high-voltage circuit is actively controlled to be cut off, the first current threshold may be set according to an actual situation, for example, the first current threshold may be set to 2.5kA, the current value is compared with 2.5kA, when the current value is less than or equal to 2.5kA, the high-voltage circuit is actively controlled to be cut off, for example, a relay contact in the high-voltage circuit may be disconnected, or an active fuse in the high-voltage circuit may be detonated, so as to cut off the high-voltage circuit, which is not limited in the embodiment of the present application.
And 102b, when the current value is greater than the first current threshold value, if the heat quantity is greater than the heat quantity threshold value, the fuse wire in the traditional fuse is fused to cut off the high-voltage loop, and the traditional fuse is connected in series in the high-voltage loop.
In the application, the obtained current value is compared with a preset threshold value, when the current value is larger than the first current threshold value, other execution steps are not needed, fuse fusing in the traditional fuse is waited, the first current threshold value can be set according to actual conditions, for example, the first current threshold value can be set to be 2.5kA, the current value is compared with 2.5kA, when the current value is larger than 2.5kA, if the heat is larger than the heat threshold value, the traditional fuse fuses, and therefore a high-voltage loop is cut off.
It should be noted that the blowing of the conventional fuse is a result of the combined action of current and time, which is a cumulative heat, and the blowing of the conventional fuse can protect the high-voltage circuit. The traditional fuse utilizes the current to flow through a conductor to heat the conductor, and the conductor melts after the melting point of the conductor is reached so as to disconnect a high-voltage circuit and protect the high-voltage circuit and other electrical appliances from being burnt.
In one implementation, a conventional fuse is connected in series in the high-voltage circuit, and the high-voltage circuit is brought from an operating state to an emergency state when at least one of the following occurs: the whole vehicle collision, insulation warning and overcurrent alarm signal are adopted, after a high-voltage circuit enters an emergency state, a certain amount of heat is accumulated before a traditional fuse is fused, so that the narrow diameter fusing inside a fuse wire is caused, then the whole high-voltage circuit is cut off, the whole process needs hundreds of milliseconds, when the current value is small, the heat accumulation lasts for a longer time, the on-off of the high-voltage circuit cannot be controlled quickly and effectively, and potential safety hazards exist. And in the embodiment of the application, the acquired current value is compared with a preset threshold value, when the current value is greater than a first current threshold value, the fusing of the traditional fuse is waited, the first current threshold value can be set according to actual conditions such as current tolerance of a relay and reliable fusing current of the traditional fuse, when the current value is greater than the first current threshold value, the heat accumulation time is short, a high-voltage loop can be quickly and effectively disconnected, and potential safety hazards are reduced.
Example two
In an embodiment of the present application, when the control to cut off the high-voltage circuit in step 102a is performed, the relay in the high-voltage circuit may be cut off to open the high-voltage circuit, or the active fuse in the high-voltage circuit may be detonated to cut off the high-voltage circuit.
As a first example, step 102a may further include: when the current value is greater than or equal to the second current threshold value and less than or equal to the first current threshold value, the gunpowder detonating device in the active fuse is triggered to cut off the high-voltage circuit, the active fuse is connected in series in the high-voltage circuit, and the second current threshold value is less than the first current threshold value.
The obtained current value is compared with a preset threshold value, when the current value is larger than or equal to the second current threshold value and smaller than or equal to the first current threshold value, a gunpowder ignition device in the active fuse is triggered, gunpowder used by the safety airbag is arranged in the active fuse, the gunpowder can be ignited by an electronic control circuit, the gunpowder is ignited, an internal insulating knife is pushed to cut off the copper bar, and therefore the whole high-voltage loop is cut off, and the fastest action time can reach 0.5 milliseconds. Wherein, the second current threshold value of this application can reliably cut off current, the reliable fusing current of traditional fuse etc. actual conditions according to the relay and set up.
It should be noted that, because the active fuse has a small volume and cannot eliminate arcing due to principle limitations, the active fuse can only cut off a short-circuit current loop of a certain energy, compared with the conventional fuse in the first embodiment. In the embodiment of the application, the acquired current value is compared with the preset threshold value, and when the current value is greater than or equal to the second current threshold value and less than or equal to the first current threshold value, the gunpowder detonating device in the active fuse is triggered, so that the high-voltage circuit can be quickly and effectively disconnected, and the potential safety hazard is reduced.
As a second example, step 102a may further include: and when the current value is smaller than a second current threshold value, the relay of the high-voltage circuit is controlled to be switched off so as to cut off the high-voltage circuit, the relay is connected in the high-voltage circuit in series, and the second current threshold value is smaller than the first current threshold value.
In the application, the acquired current value is compared with a preset threshold value, for example, when the current value is smaller than the second current threshold value, the relay of the high-voltage loop is controlled to be switched off.
The relay needs to open and close thousands of times in the long-term working process, and the relay contacts are easily adhered by heat and electric arcs generated by the relay contacts, so that the control failure of a battery pack loop is caused. In one scene, when the whole vehicle collides, or a high-voltage wire harness is extruded and cut, the high-voltage wire cable is damaged, insulation failure occurs, short-circuit heavy current can occur instantly, if the short-circuit heavy current does not reach the fusing heat of a traditional fuse, the relay is required to be disconnected in a matching way, however, when the BMS receives a collision signal and controls the relay to respond for tens of milliseconds of completing high-voltage down-voltage, personnel in the vehicle still have the risk of high-voltage electric shock, and potential safety hazards exist; in another kind of scene, when the outside high-pressure short circuit appears in the battery package, the short-circuit current is too big, but the fusing current of traditional fuse exceeds relay main contact holding current, relay contact once repels this moment, even continuous shake, the main contact is very easily taken place the adhesion, the relative big resistance that shows after the relay adhesion can reduce short-circuit current, in case be less than the fusing power of traditional fuse, then the fuse of high-voltage loop can't fuse, battery overdischarge appears in this kind of scene easily in the short time, initiation thermal runaway.
In the two application scenes, a single disconnection mode is not adopted, the current collected current is compared with a preset current threshold, and a proper effective disconnection scheme is selected according to the comparison result, for example, in one scene, a relay of a high-voltage loop can be directly controlled to disconnect or an active fuse is detonated, the fuse is not waited to be fused, and the time is saved; in another scene, the relay is not disconnected, and the fuse is waited to be fused; the high-voltage circuit can be quickly and effectively disconnected, and potential safety hazards are reduced.
The mode that initiative fuse, relay, traditional fuse mutually supported has been adopted in this application embodiment, cuts off high-voltage circuit in grades, avoids appearing the relay adhesion and the unable condition of fusing again of traditional fuse, and the hierarchical cutting method of this application, according to the order that the current value is from little to big, controls the relay disconnection in proper order, detonates initiative fuse, traditional fuse fusing, realizes effective quick cutting off high-voltage circuit, has improved high-voltage system's reliability. The traditional fuse can ensure the basic safety of a high-voltage system under the condition of overcurrent or short circuit, and a main high-voltage loop is cut off when the high-voltage system has continuous short circuit or large current; the active fuse and the relay respectively work together with a current collector and controller hardware in the high-voltage system, when the current collector catches the instantaneous high-current condition of the system or the controller receives a collision signal and an insulation warning, the active disconnection of a high-voltage loop can be realized by detonating the active fuse or disconnecting the relay, and the safety of the high-voltage system is further improved.
Optionally, in an embodiment of the present application, the controlling the opening of the relay of the high-voltage circuit includes: when the high-voltage loop is a discharging loop, the main negative relay and the main positive relay are controlled to be disconnected, and the main negative relay and the main positive relay are connected in series in the high-voltage loop; when the high-voltage loop is a charging loop, the quick charging negative relay and the quick charging positive relay are controlled to be disconnected, and the quick charging negative relay and the quick charging positive relay are connected in series in the high-voltage loop; the relay comprises a main negative relay, a main positive relay, a quick-charging negative relay and a quick-charging positive relay.
The high-voltage circuit of the battery system of the whole vehicle usually comprises a battery pack, a BMS, various relays and fuses, wherein the battery pack is connected through the various relays, and when the electric energy needs to be provided for the whole vehicle, the BMS controls the quick-charging negative relay and the quick-charging positive relay to be closed so that the battery pack is connected to a power supply circuit; when the electric energy does not need to be provided for the whole vehicle, the BMS controls the quick-charging negative relay and the quick-charging positive relay to be disconnected, so that the battery pack is disconnected with the power supply circuit. The main positive relay and the main negative relay are connected in series in the high-voltage loop and are used for controlling the on-off of the high-voltage discharge loop and the high-voltage accessory power utilization loop; the quick charge positive relay and the quick charge negative relay are connected in series in the high-voltage loop and are used for controlling the on-off of the quick charge high-voltage loop of the battery system; the main relay and the quick charging relay can be in series connection or parallel connection, the main relay comprises a main positive relay and a main negative relay, and the quick charging relay comprises a quick charging positive relay and a quick charging negative relay. The relay in the embodiment of the application further comprises an auxiliary appliance positive relay, and the auxiliary appliance positive relay is used for auxiliary appliance power distribution control.
Further, in one embodiment of the present application, if the fuse fails to blow or the control relay fails to open in the conventional fuse, the powder igniter in the active fuse is triggered to cut off the high voltage circuit.
In an implementation mode, after the traditional fuse fuses, whether the high-voltage circuit is disconnected or not is judged, and if the traditional fuse fuses and fails to fuse, so that the high-voltage circuit is not disconnected, the gunpowder detonating device in the active fuse is triggered again to cut off the high-voltage circuit; in another realizable mode, after the control relay is disconnected, whether the high-voltage circuit is disconnected or not is judged, and if the control relay is failed to be disconnected, so that the high-voltage circuit is not disconnected, the gunpowder detonating device in the active fuse is triggered again to cut off the high-voltage circuit. Whether normal disconnection of high-voltage circuit still detects in this application embodiment to because fuse fusing is invalid or control relay disconnection failure in traditional fuse, lead to high-voltage circuit not normally to break off, cause the potential safety hazard. If the high-voltage circuit is not normally disconnected, the gunpowder detonating device in the active fuse is triggered again to cut off the high-voltage circuit, and the safety of the high-voltage system is further improved.
Further, in an embodiment of the present application, the number of times of detonation of the active fuse is triggered is counted, and when the number of times of detonation is greater than or equal to a detonation threshold, an abnormal alarm message is generated.
The embodiment of the application also sets a detonation threshold, wherein the detonation threshold refers to the maximum number of times of detonation which can be tried, and when the number of times of detonation exceeds or equals to the maximum number of times of detonation, abnormal alarm information is generated to give an alarm to the whole vehicle, so that time is saved, the whole vehicle can take other effective measures, and a high-voltage loop is quickly cut off.
Further, in an embodiment of the present application, when the high voltage circuit enters an emergency state from the working state, data related to the emergency state is stored in the local memory; and transmits data relating to the high-pressure circuit to the outside.
When the high-voltage loop enters an emergency state, data related to the emergency state are stored in a local memory, and reference is provided for fault diagnosis and after-the-fact investigation; meanwhile, data related to the high-voltage circuit is sent out, for example, some important operation data in the high-voltage circuit is sent out to other control units or other equipment with a storage function, and data loss is prevented.
Further, the embodiment of the present application exemplarily illustrates how to cut off the high-voltage circuit in stages, and optionally, as shown in fig. 2, fig. 2 provides a flowchart of cutting off the high-voltage circuit in stages for the embodiment of the present application.
It should be noted that, in the embodiment of the present application, both the first current threshold and the second current threshold may be set according to a relay withstand current, a relay reliable cutoff current, and a conventional fuse reliable fusing current, which are only exemplarily described, but are not limited thereto.
According to the embodiment of the application, the overcurrent alarm signal is detected firstly, and if the controller receives the overcurrent alarm signal sent by the shunt in real time, the high-voltage system enters an emergency mechanism, namely the high-voltage loop enters an emergency state from a working state. After the high-voltage system enters the emergency mechanism, the BMS needs to immediately send important data related to the high-voltage circuit to a controller (Electronic Control Unit, ECU for short) through a communication port, that is, the controller stores the important data, and also stores data related to the emergency state in a local memory, so as to provide reference for fault diagnosis and post investigation. After the high-voltage system enters the emergency mechanism, the controller communicates with the shunt in the current acquisition module, the shunt is switched from normal current sampling to rapid current sampling, the controller acquires a current value obtained by rapidly sampling the shunt, and when the current value is compared with a current threshold value, the application adopts the latest current value acquired in real time after the high-voltage system enters the emergency mechanism, so that the accuracy of a comparison result can be improved, and the low accuracy of the comparison result caused by the fact that the current value is inconsistent before the high-voltage system enters the emergency mechanism and after the high-voltage system enters the emergency mechanism is avoided. The current rechecking in fig. 2 includes not only collecting the current value in the high-voltage circuit in real time after entering an emergency mechanism, but also collecting the current value in the high-voltage circuit in real time after detonating the active fuse and counting the number of times of detonation.
For example, the second current threshold I may be set in the embodiments of the present applicationTHLSet to 1.5kA, a first current threshold ITHHSet to 2.5 kA. Herein with ITHLEqual to 1.5kA, ITHHFor example, 2.5kA is taken as an example to explain, after the high-voltage system enters the emergency mechanism, it is determined whether the current value is less than 1.5kA, and when the high-voltage loop is a discharge loop, if the current value is less than 1.5kA<And 1.5kA, sequentially disconnecting the main negative relay and the main positive relay in the high-voltage loop, thereby cutting off the whole high-voltage loop. It can be understood that when the high voltage circuit is a charging circuit, if the current value is the same<And 1.5kA, the quick charge negative relay and the quick charge positive relay in the high-voltage loop are sequentially disconnected, so that the whole high-voltage loop is cut off.
If the current value is not less than 1.5kA, judging whether the current value is more than 2.5kA, if so, waiting for the traditional fuse to be reliably fused, and cutting off the whole high-voltage loop; if the judgment result is negative, the active fuse is directly detonated, the gunpowder detonating device in the active fuse discharges to detonate the gunpowder, the internal insulating knife is pushed to cut off the copper bar, and therefore the whole high-voltage loop is cut off.
In this application embodiment, after main negative relay, main positive relay (fill negative relay soon, fill positive relay soon) or traditional fuse fusing, still judge whether high-voltage circuit normally cuts off, if break high-voltage circuit relay failure or traditional fuse fusing inefficacy, high-voltage circuit did not cut off this moment, then high-voltage system can get into again and explode the initiative fuse. It should be noted that, the active fuse fails after being successfully fused once, and parts must be replaced, the application also counts the number of times of detonating the active fuse, and sets the maximum number of times of attempted detonating as M, so that the high-voltage system will continue to attempt to detonate in consideration of the possibility of failure in the triggering detonation process and the failure of the active fuse in fusing, and the emergency mechanism is exited if the circuit is normally detonated and cut off. The initial value of the detonation frequency is 0, the initial value i of the attempted detonation frequency in fig. 2 is 0, the statistical frequency is increased by one every time the detonation is carried out, the maximum attempted detonation frequency is M, namely, the active fuse can try to detonate at most M times in the whole life cycle, if the detonation can not be successfully detonated for M times, the active fuse or the detonation loop thereof has problems, and the alarm is directly sent to the whole vehicle without trying again, and the loop is cut off by adopting other modes. The value M in the present application may be set according to a safety mechanism and execution time of each electronic and electrical component, and this embodiment of the present application is not limited. For example, M is 5 times, in the embodiment of the present application, it is allowed to attempt to detonate the active fuse less than 5 times, after attempting to detonate the active fuse for 4 times, if the high-voltage circuit is normally cut off, the emergency mechanism is tripped out, and if all three kinds of cut-off circuits fail, an abnormal alarm signal is sent to the whole vehicle.
The current value obtained by quickly sampling the current divider is obtained, the current value when the current threshold value is compared with the current value is the latest current value acquired in real time after the high-voltage system enters an emergency mechanism, and through current rechecking, the accuracy of the comparison result can be improved, and the current value is respectively compared with the first current threshold value and the second current threshold value, different high-voltage circuit cutting schemes are adopted according to the comparison result, the high-voltage circuit is cut off in a grading way, compared with a single cutting method, the high-voltage circuit can be cut off quickly and effectively, in addition, the embodiment of the application also checks whether the high-voltage loop can be normally cut off, if the high-voltage loop is normally cut off, and exiting the emergency mechanism, if the high-voltage loop is not normally cut off, alarming by an abnormal signal, and informing the high-voltage system of the abnormal condition so that the high-voltage system can take other measures to ensure the safety of the high-voltage loop.
EXAMPLE III
An embodiment of the present application provides a controller of a high voltage circuit, as shown in fig. 3, fig. 3 is the controller of the high voltage circuit provided in the embodiment of the present application, and the controller 30 includes: an acquisition module 301 and a cut-off module 302;
when the high-voltage circuit enters an emergency state from a working state, the obtaining module 301 is configured to obtain a current value obtained by sampling a current of the high-voltage circuit;
the cutting module 302 is configured to control to cut off the high-voltage circuit when the current value is less than or equal to the first current threshold, and when the current value is greater than the first current threshold, if the heat is greater than the heat threshold, the fuse in the conventional fuse is blown to cut off the high-voltage circuit, and the conventional fuse is connected in series in the high-voltage circuit.
Optionally, in an embodiment of the present application, the breaking module 302 is further configured to trigger a powder firing device in an active fuse to break the high voltage circuit when the current value is greater than or equal to a second current threshold and less than or equal to the first current threshold, where the active fuse is connected in series in the high voltage circuit, and the second current threshold is less than the first current threshold.
Optionally, in an embodiment of the present application, the cut-off module 302 is further configured to control the relay of the high-voltage circuit to open and cut off the high-voltage circuit when the current value is smaller than a second current threshold, where the second current threshold is smaller than the first current threshold.
Optionally, in an embodiment of the present application, the cut-off module 302 is further configured to control the main negative relay and the main positive relay to be turned off when the high-voltage loop is a discharge loop; when the high-voltage loop is a charging loop, the quick charging negative relay and the quick charging positive relay are controlled to be disconnected, and the relays comprise a main negative relay, a main positive relay, a quick charging negative relay and a quick charging positive relay.
Optionally, in an embodiment of the present application, the cutting module 302 is further configured to trigger the powder detonation device in the active fuse to cut off the high voltage circuit if the fuse in the conventional fuse fails to blow or the control relay fails to open.
Optionally, in an embodiment of the present application, the controller 30 further includes a generation module; the generation module is used for counting the number of attempted detonating times of the active fuse, and when the number of attempted detonating times is larger than or equal to a detonating threshold value, abnormal alarm information is generated.
Optionally, in an embodiment of the present application, the controller 30 further includes a saving module; when the high-voltage loop enters an emergency state from a working state, the storage module also stores data related to the emergency state in a local memory; and for sending data relating to the high-voltage circuit to the outside.
Optionally, in an embodiment of the present application, the high-voltage circuit enters the emergency state from the operating state when at least one of the following occurs: collision of the whole vehicle, insulation warning and overcurrent alarm signals.
Optionally, in an embodiment of the present application, the controller 30 further includes a receiving module, where when the high-voltage loop is in a normal state, the receiving module receives a first current signal sampled by the shunt at a normal rate and a second current signal collected by the hall current sensor, and verifies the first current signal and the second current signal, and the receiving module further receives an overcurrent alarm signal sent by the shunt; when the receiving module receives an overcurrent alarm signal sent by the shunt, the high-voltage loop enters an emergency state from a normal state.
Example four
Based on the method for disconnecting the high-voltage circuit described in the first embodiment to the second embodiment, an embodiment of the present application provides a high-voltage system, as shown in fig. 4, fig. 4 is a structural diagram of the high-voltage system provided in the embodiment of the present application, and the high-voltage system includes: the power supply comprises a current collector 10, a battery pack 20, a cutting module 40, a traditional fuse 50 and any one controller 30 in the third embodiment; the conventional fuse 50, the cutting module 40 and the current collector 10 are connected in series and then connected between the anode and the cathode of the battery pack 20, and the current collector 10 sends the collected current value to the controller 30; the cutting module 40 is electrically connected to the controller 30.
It should be noted that the position of the conventional fuse 50 in the high voltage circuit may be changed, and the conventional fuse 50 in the embodiment of the present application is disposed between the electrode of the battery pack 20 and the cutting module 40. The current collector 10 in the embodiment of the present application is close to the electrode of the battery pack 20, so that the branch current can be prevented from being missed, and the comprehensiveness of the collected current value is improved. The controller 30 receives a current value acquired by the current collector 10, meanwhile, the controller 30 can also receive an overcurrent alarm signal sent by the current collector 10, when the controller 30 receives the overcurrent alarm signal sent by the current collector 10, or receives a collision signal of collision of the whole vehicle, or receives an insulation warning, the high-voltage system enters an emergency mechanism, that is, the high-voltage loop enters an emergency state from a normal state, at the moment, the controller 30 receives the current value acquired by the current collector 10, compares the current value with a current threshold value, and executes different high-voltage loop cutting schemes according to the comparison result, optionally, when the current value is smaller than or equal to the first current threshold value, a cut-off signal is sent to the cut-off module 40, so that the cut-off module 40 cuts off the high-voltage loop according to the cut-off signal; when the current value is greater than the first current threshold value, the controller 30 does not perform an action to wait for the fuse in the conventional fuse 50 to be blown to cut off the high voltage circuit.
Optionally, in an embodiment of the present application, as shown in fig. 5, fig. 5 is a block diagram of another high voltage system provided in the embodiment of the present application, where the high voltage system includes: a shunt 101 and a hall current sensor 102, a battery pack 20, a cut-off module 40, a conventional fuse 50, and any one of the controllers 30 of the third embodiment; the shunt 101, the hall current sensor 102, the conventional fuse 50 and the cut-off module 40 are connected in series and then connected between the positive electrode and the negative electrode of the battery pack 20; when the high-voltage system is in a normal state, the shunt sends the collected first current signal or the collected overcurrent alarm signal to the controller 30, and the Hall current sensor sends the collected second current signal to the controller 30; when the high voltage system is in an emergency state, the shunt sends the acquired current value to the controller 30.
It is understood that the current collector 10 may be the shunt 101, or may also be the hall current sensor 102, and the current collector 10 may also be the shunt 101 and the hall current sensor 102, and the current collector 10 is only described as including the shunt 101 and the hall current sensor 102, which does not represent that the embodiment of the present application is limited thereto.
When the high-voltage system is in a normal state, that is, when the high-voltage loop is in a normal state, the shunt 101 and the hall current sensor 102 are connected in series between the positive electrode and the negative electrode of the battery pack, and fig. 5 shows that the shunt 101 and the hall current sensor 102 are connected in series to the positive electrode of the battery pack, which is only exemplary, and is not limited to connecting the positive electrode of the battery pack, the shunt 101 and the hall current sensor 102 are connected in series to the positive electrode of the battery pack, so that the current of the missed detection branch can be avoided, and the comprehensiveness of the acquired current value can be improved. Shunt 101 and hall current sensor 102 are as current detection unit, and shunt 101 and hall current sensor 102 in this application embodiment are supplied power by the BMS, and the BMS provides two way power supplies with different power respectively to shunt 101 and hall current sensor 102, can avoid with group power failure to lead to shunt 101 and hall current sensor 102 to lose efficacy simultaneously, improve high voltage system's reliability. The controller 30 in the embodiment of the present application receives the first current signal sent by the shunt 101 and the second current signal sent by the hall current sensor 102, and verifies the first current signal and the second current signal with each other, and can determine whether the shunt and the hall current sensor have a fault or not according to a verification result. The current divider 101 in the embodiment of the present application not only outputs a current value or an equivalent voltage value periodically, but also provides a real-time overcurrent alarm signal to the controller 30 through a hard wire. The current divider 101 in the embodiment of the present application provides both normal and fast current sampling rates, with a normal rate of current sampling, e.g., one update of 10ms-50 ms. The fast current sampling should be several times of the normal sampling rate, for example, 1ms to 3ms update once, when the high voltage system is in a normal state, the current divider 101 performs current sampling at the normal rate and sends a first current signal to the controller 30; when the high-voltage system is in an emergency state, the current divider 101 performs current sampling quickly, and sends the acquired current value to the controller 30, so that time is saved, the controller can acquire the current value of the high-voltage system after entering an emergency mechanism quickly, a corresponding cut-off scheme is executed quickly, and safety of the high-voltage system is improved.
Optionally, in an embodiment of the present application, as shown in fig. 6, fig. 6 is a block diagram of another high voltage system provided in the embodiment of the present application, where the high voltage system includes: the relay 401, the active fuse 402, the current collector 10, the battery pack 20, the cut-off module 40, the conventional fuse 50, and the controller 30 according to any one of the third embodiment; the conventional fuse 50, the relay 401, the active fuse 402, and the current collector 10 are connected in series and then connected between the positive electrode and the negative electrode of the battery pack 20.
It should be understood that the disconnection module 10 may be the relay 401, the active fuse 402, or both the relay 401 and the active fuse 402, and the disconnection module 10 is only described as including the relay 401 and the active fuse 402, which does not represent that the embodiment of the present application is limited thereto.
It should be noted that the relays 401 are paired, and when the high-voltage circuit is a discharging circuit, the main negative relay and the main positive relay in the relay 401 are connected to the high-voltage circuit, and when the high-voltage circuit is a charging circuit, the quick-charging negative relay and the quick-charging positive relay in the relay 401 are connected to the high-voltage circuit, and in fig. 6 of the embodiment of the present application, the relay 401 is represented by S1 and S2.
When the high-voltage system is in an emergency state, the controller 30 sends an ignition signal to the active fuse 402 to trigger the explosive ignition device in the active fuse 402 to cut off the high-voltage circuit, and the controller 30 sends a turn-off signal to the relay 401 to control the relay 401 of the high-voltage circuit to be turned off according to the turn-off signal, wherein the turn-off signal comprises the ignition signal and the turn-off signal.
Optionally, in an embodiment of the present application, the relay 401 includes a main negative relay, a main positive relay, a fast charge negative relay, and a fast charge positive relay; when the conventional fuse 50, the main negative relay, the main positive relay, the cutoff module 40 and the current collector 10 are connected in series and then connected between the positive electrode and the negative electrode of the battery pack 20, the high-voltage system is in a discharging state; when the conventional fuse 50, the fast charge negative relay, the fast charge positive relay, the cut-off module 40 and the current collector 10 are connected in series and then connected between the positive electrode and the negative electrode of the battery pack 20, the high-voltage system is in a charging state.
The controller 30 sends a turn-off signal to the relay 401, and controls the main negative relay and the main positive relay of the high-voltage circuit to be disconnected according to the turn-off signal when the high-voltage system is in a discharging state, and controls the quick-charging negative relay and the quick-charging positive relay of the high-voltage circuit to be disconnected according to the turn-off signal when the high-voltage system is in a charging state.
In the high voltage system described in fig. 4 to 6 of the fourth embodiment, any one of the embodiments may be combined with other embodiments to form a new embodiment, for example, in a new embodiment, the high voltage system includes: a current divider 101, a battery pack 20, a cutoff module 40, a conventional fuse 50, and any one of the controllers 30 of the third embodiment; as another example, in a new embodiment, a high pressure system comprises: the current divider 101, the battery pack 20, the relay 401, the conventional fuse 50, and the controller 30 according to any one of the third embodiment, which is not limited in this embodiment of the present application.
Further, an electrical integrated system is provided in an embodiment of the present application, as shown in fig. 7, fig. 7 is a structural diagram of the electrical integrated system provided in the embodiment of the present application, and the electrical integrated system serves as a power distribution unit and provides a high-voltage input interface, an output interface, and a low-voltage input interface. This electric integrated system includes anodal (BATT +) of group battery and negative pole (BATT-) interface and group battery high voltage output interface, and anodal (BATT +) of group battery and negative pole (BATT-) are connected to electric assembly through the copper bar, and electric assembly contains two pairs of relay groups: the main positive relay and the main negative relay are used for controlling the on-off of the discharging loop and the high-voltage accessory power utilization loop; the quick charge positive relay and the quick charge negative relay are used for controlling the on-off of a quick charge high-voltage loop of the battery system; the quick charging positive relay and the quick charging negative relay are electrically connected with the charging station, and when the quick charging positive relay and the quick charging negative relay are closed, the high-voltage loop is charged. The high-voltage output interface of the battery pack comprises a plurality of user electrical interfaces, and the high-voltage loop is arranged in the electrical assembly and used for transmitting electric power to the quick charging port, the rear driving motor, the front driving motor, the air conditioning compressor (ACP), the air conditioner (PTC), the battery electric heating (ESS-PTC) and the wireless charger (WLC). The electric branch is also provided with redundancy reservation and can be selectively used according to the requirements of the whole vehicle. The high-voltage electric appliance is connected with the high-voltage electric appliance through a special high-voltage connector on the panel of the electric integrated system; and the low-voltage connector on the panel of the electrical integrated system is connected with an external ECU and a lead-acid battery of the whole vehicle. The electric integrated system structure is respectively an upper cover, a middle frame, an electric unit and an inner frame for bearing the electric unit from top to bottom. The electronic and electrical unit comprises a current collector, a relay group and a fuse group, the hierarchical division of the whole structure is clear, the electronic and electrical unit can be disassembled after the fixing bolts of the upper cover, the inner frame and the middle frame support are disassembled, the electronic and electrical unit is convenient to assemble and overhaul, the maintenance cost is reduced, and the battery cell maintenance is also convenient.
EXAMPLE five
Based on the method for disconnecting a high-voltage circuit described in the first to second embodiments, an embodiment of the present application provides a computer storage medium storing a computer program that, when executed by a processor, implements the method for disconnecting a high-voltage circuit described in the first to second embodiments.
The above-described methods according to embodiments of the present application may be implemented in hardware, firmware, or as software or computer code storable in a recording medium such as a CD ROM, a RAM, a floppy disk, a hard disk, or a magneto-optical disk, or as computer code originally stored in a remote recording medium or a non-transitory machine-readable medium downloaded through a network and to be stored in a local recording medium, so that the methods described herein may be stored in such software processes on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware such as an ASIC or FPGA. It will be appreciated that the computer, processor, microprocessor controller or programmable hardware includes memory components (e.g., RAM, ROM, flash memory, etc.) that can store or receive software or computer code that, when accessed and executed by the computer, processor or hardware, implements the high voltage circuit shut-off method described herein. Furthermore, when the general-purpose computer accesses code for implementing the shut-off method of the high-voltage circuit shown here, execution of the code converts the general-purpose computer into a special-purpose computer for executing the shut-off method of the high-voltage circuit shown here.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Those of ordinary skill in the art will appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above embodiments are only used for illustrating the embodiments of the present application, and not for limiting the embodiments of the present application, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application, so that all equivalent technical solutions also belong to the scope of the embodiments of the present application, and the scope of patent protection of the embodiments of the present application should be defined by the claims.

Claims (10)

1. A method of disconnecting a high-pressure circuit, the method comprising:
when the high-voltage loop enters an emergency state from a working state, acquiring a current value obtained by sampling the current of the high-voltage loop;
when the current value is smaller than or equal to a first current threshold value, controlling to cut off the high-voltage loop;
and when the current value is greater than the first current threshold value, if the heat is greater than the heat threshold value, the fuse wire in the conventional fuse is fused to cut off the high-voltage loop, and the conventional fuse is connected in series in the high-voltage loop.
2. The method of claim 1, wherein controlling the high voltage circuit to be shut off when the current value is less than or equal to a first current threshold comprises:
when the current value is greater than or equal to a second current threshold value and less than or equal to the first current threshold value, triggering a gunpowder detonating device in an active fuse to cut off the high-voltage circuit, wherein the active fuse is connected in series in the high-voltage circuit, and the second current threshold value is less than the first current threshold value.
3. The method of claim 1, wherein controlling the high voltage circuit to be shut off when the current value is less than or equal to a first current threshold comprises:
and when the current value is smaller than a second current threshold value, controlling a relay of the high-voltage circuit to be disconnected and cutting off the high-voltage circuit, wherein the second current threshold value is smaller than the first current threshold value.
4. The method of claim 3, wherein controlling the relay of the high voltage circuit to open comprises:
when the high-voltage loop is a discharging loop, a main negative relay and a main positive relay are controlled to be disconnected, and the main negative relay and the main positive relay are connected in the high-voltage loop in series;
when the high-voltage loop is a charging loop, a quick charging negative relay and a quick charging positive relay are controlled to be disconnected, and the quick charging negative relay and the quick charging positive relay are connected in series in the high-voltage loop;
the relay comprises the main negative relay, the main positive relay, the quick charge negative relay and the quick charge positive relay.
5. The method of claim 3, further comprising:
and if the fuse wire in the traditional fuse fails to fuse or the control relay fails to open, triggering a gunpowder detonating device in the active fuse to cut off the high-voltage loop.
6. The method of claim 5, further comprising:
counting the number of attempted detonating times for triggering the active fuse, and generating abnormal alarm information when the number of attempted detonating times is greater than or equal to a detonating threshold value.
7. The method of claim 1, further comprising: when the high-voltage loop enters an emergency state from a working state, storing data related to the emergency state in a local memory;
and transmits data relating to the high-pressure circuit to the outside.
8. The method of claim 1, further comprising:
the high-voltage circuit enters an emergency state from an operating state when at least one of the following occurs: collision of the whole vehicle, insulation warning and overcurrent alarm signals.
9. A controller for a high pressure circuit, the controller comprising: an acquisition module and a cutting module;
when the high-voltage loop enters an emergency state from a working state, the acquisition module is used for acquiring a current value obtained by sampling the current of the high-voltage loop;
the cutting-off module is used for controlling cutting off the high-voltage loop when the current value is smaller than or equal to a first current threshold value, and when the current value is larger than the first current threshold value, if the heat is larger than a heat threshold value, a fuse wire in a traditional fuse is fused to cut off the high-voltage loop, and the traditional fuse is connected in the high-voltage loop in series.
10. A high-pressure system, characterized in that the high-pressure system comprises: a current collector, a battery pack, a disconnect module, a conventional fuse, and the controller of claim 9;
the traditional fuse, the cutting module and the current collector are connected in series and then connected between the anode and the cathode of the battery pack, and the current collector sends the collected current value to the controller;
the cutting-off module is electrically connected with the controller.
CN202010688192.5A 2020-07-16 2020-07-16 High-voltage circuit cutting method, controller and high-voltage system Pending CN113949032A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116080403A (en) * 2023-02-17 2023-05-09 中汽研汽车检验中心(广州)有限公司 Safety protection system for automobile battery pack
WO2023236451A1 (en) * 2022-06-08 2023-12-14 广州小鹏汽车科技有限公司 Short-circuit protection system, and traction battery system of electric vehicle
WO2024087458A1 (en) * 2022-10-24 2024-05-02 惠州亿纬锂能股份有限公司 Short-circuit protection method and system for high-voltage circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023236451A1 (en) * 2022-06-08 2023-12-14 广州小鹏汽车科技有限公司 Short-circuit protection system, and traction battery system of electric vehicle
WO2024087458A1 (en) * 2022-10-24 2024-05-02 惠州亿纬锂能股份有限公司 Short-circuit protection method and system for high-voltage circuit
CN116080403A (en) * 2023-02-17 2023-05-09 中汽研汽车检验中心(广州)有限公司 Safety protection system for automobile battery pack
CN116080403B (en) * 2023-02-17 2023-07-25 中汽研汽车检验中心(广州)有限公司 Safety protection system for automobile battery pack

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