CN113484766A - Fuse active fusing circuit, device and battery assembly - Google Patents
Fuse active fusing circuit, device and battery assembly Download PDFInfo
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- CN113484766A CN113484766A CN202110942070.9A CN202110942070A CN113484766A CN 113484766 A CN113484766 A CN 113484766A CN 202110942070 A CN202110942070 A CN 202110942070A CN 113484766 A CN113484766 A CN 113484766A
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- 230000006698 induction Effects 0.000 claims abstract description 116
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 230000002159 abnormal effect Effects 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 40
- 238000007599 discharging Methods 0.000 claims description 8
- 238000007664 blowing Methods 0.000 description 10
- 230000005672 electromagnetic field Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The application discloses insurance initiative fusing circuit, device and battery pack belongs to circuit protection technical field, and wherein, insurance initiative fusing circuit includes: the device comprises a power supply module, a fault detection module, an induction coil and a fuse; the induction coil is arranged corresponding to the fuse, the power supply module is electrically connected with the induction coil, the first end of the fault detection module is connected with the circuit to be detected, the second end of the fault detection module is connected with the control end of the power supply module, and the fuse is connected in series with the power supply end of the circuit to be detected; the fault detection module controls the power supply module to supply current with periodically changed current direction to the induction coil when detecting that the circuit to be detected is abnormal, so that the fuse cuts magnetic induction lines generated by the induction coil and generates temperature rise until the fuse is fused. The safety performance of the fuse active fusing circuit can be improved.
Description
Technical Field
The application belongs to the technical field of circuit protection, and particularly relates to an active fuse circuit, an active fuse device and a battery pack.
Background
In the related art, a three-terminal fuse, which is a device that can be blown by an instruction and also blown by an overcurrent, is installed in a circuit, thereby enabling a function of preventing overcurrent blowing and abnormal blowing.
However, the three-terminal fuse in the market can only meet the application scenario of low voltage and low current, and the active fuse in a system with high current or high voltage mainly adopts an explosive fuse.
In view of the low safety performance of the explosion-type fuse, the active fuse in a system with high current or high voltage has the defect of low safety performance.
Disclosure of Invention
The embodiment of the application aims to provide a fuse active fusing circuit, a fuse active fusing device and a battery assembly, which can improve the safety performance of an active fusing fuse adopted in a high-current or high-voltage system.
In order to solve the technical problem, the present application is implemented as follows:
the fault detection module, the induction coil and the fuse are arranged;
the induction coil is arranged corresponding to the fuse, the power supply module is electrically connected with the induction coil, the first end of the fault detection module is connected with a circuit to be detected, the second end of the fault detection module is connected with the control end of the power supply module, and the fuse is connected in series with the power supply end of the circuit to be detected;
and the fault detection module controls the power supply module to supply current with periodically changed current direction to the induction coil when detecting that the circuit to be detected is abnormal, so that the fuse cuts the magnetic induction lines generated by the induction coil and generates temperature rise until the fuse is fused under the action of the temperature rise.
Optionally, the power supply module includes: a power supply and a first switch;
the power supply is electrically connected with the induction coil through the first switch, and the second end of the fault detection module is connected with the control end of the first switch;
and the fault detection module controls the first switch to be periodically conducted under the condition that the circuit to be detected is detected to be abnormal, so that the direction of current flowing through the induction coil is periodically changed.
Optionally, the fault detection module further includes: an adjustment module;
the adjusting module is connected between the first switch and the induction coil;
under the action of the adjusting module, in one conducting period of the first switch, the direction of current flowing through the induction coil is switched between a first direction and a second direction at least once;
wherein the first direction is opposite to the second direction.
Optionally, the adjusting module includes: a first capacitor;
the first end of the first capacitor is connected with the first end of the power supply, and the second end of the first capacitor is connected with the second end of the power supply through the first switch;
the induction coil is connected with the first capacitor in parallel;
the direction of current flowing through the induction coil is a first direction when the first switch is turned on, the first direction in a first time period after the first switch is turned off, and the second direction in a second time period after the first switch is turned off; the first time period is a charging time period of the first capacitor, and the second time period is a discharging time period of the first capacitor.
Optionally, the adjusting module further includes: an LC resonance controller;
the LC resonance controller is connected between the fault detection module and the control end of the first switch;
and under the condition that the fault detection module detects that the circuit to be detected is abnormal, the LC resonance controller controls the first switch to be periodically conducted.
Optionally, the on period of the first switch is matched with the charge-discharge period of the first capacitor.
Optionally, the first switch is a transistor switch.
Optionally, the circuit to be detected includes a battery to be detected, and the fault detection module includes a battery management system module BMS connected to the battery to be detected.
Optionally, the power supply module multiplexes the battery to be detected.
In a second aspect, embodiments of the present application provide a fail-safe active fusing apparatus, including the fail-safe active fusing circuit according to the first aspect.
In a third aspect, an embodiment of the present application provides a battery assembly, which includes a battery to be tested and the safety active fusing circuit according to the first aspect.
In the embodiment of the application, the induction coil and the fuse are arranged correspondingly, so that the fuse is positioned in the electromagnetic field of the induction coil, and therefore when the fault detection module detects that the circuit to be detected is abnormal, the first switch is controlled to be periodically conducted, and the electromagnetic field of the induction coil can be periodically changed; and the fuse is located induction coil's electromagnetic field to make induction coil's magnetic induction line cutting fuse, so that form the vortex in the fuse, and under the effect of this vortex, gradual intensification, until the fuse fuses, realized the initiative fusing of fuse, consequently, the fuse initiative fusing circuit that this application embodiment provided can initiatively fuse with non-contact's mode, can promote the security of initiative fusing fuse.
Drawings
FIG. 1 is a schematic circuit diagram of an embodiment of a fail-safe active blow circuit;
fig. 2 is a schematic circuit diagram of another fuse active blowing circuit according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The safety active fusing circuit provided by the embodiment of the application can be used for protection of a large-current or large-voltage circuit, and the following embodiment exemplifies that the safety active fusing circuit provided by the embodiment of the application is used for a lithium battery system.
At present, a safety is designed and installed in the system application of the new energy of the lithium battery to ensure the safety of the system under abnormal conditions, and particularly when an electronic and electrical system fails, the safety is the final checkpoint for finally ensuring the safety of the system.
Particularly, in some international standards, such as IEC62619, etc., it is emphasized that the safety of the system needs to be ensured after the charging protection switch of the lithium battery device fails during the charging process, and at this time, a safety device capable of being actively blown is needed to ensure the safety of the system.
However, the three-terminal fuse in the market can only meet the application scenario of low voltage and low current, and the active fuse in a system with high current or high voltage mainly adopts an explosive fuse.
The embodiment of the application provides a scheme for heating and actively fusing a fuse through non-contact induction, so as to solve the technical problem of complex structure of an actively fused fuse of a high-current and high-voltage system in the current market.
The following describes in detail the safety active fusing circuit, the safety active fusing device, and the battery pack according to the embodiments of the present application with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of a fail-safe active blow circuit includes: a power supply module 10, a fault detection module 30, an induction coil 40 and a fuse 50.
The induction coil 40 is arranged corresponding to the fuse 50, the power supply module 10 is electrically connected with the induction coil 40, the first end of the fault detection module 30 is connected with a circuit to be detected, the second end of the fault detection module 30 is connected with the control end of the power supply module 10, and the fuse 50 is connected in series with the power supply end of the circuit to be detected;
when detecting that the circuit to be detected is abnormal, the fault detection module 30 controls the power supply module 10 to supply a current with a current direction periodically changing to the induction coil 40, so that the fuse 50 cuts the magnetic induction lines generated by the induction coil 40 and generates a temperature rise until the fuse 50 is fused under the action of the temperature rise.
In a specific implementation, the induction coil 40 is disposed corresponding to the fuse 50, and it can be understood that: the fuse 50 is located within the electromagnetic field of the induction coil 40 and the fuse 50 is not in contact with the induction coil 40. Thus, by making the fuse 50 cut the magnetic induction lines of the induction coil 40, a large number of small eddy currents of the internal parameters of the fuse 50 can be generated, and a temperature rise is generated by the eddy currents until the fuse 50 is blown. Therefore, when the fuse is applied to a high-voltage or high-current application scene, the fuse 50 can be controlled to be actively fused in a non-contact mode, and the fuse is simple in structure and high in safety performance.
Preferably, the induction coil 40 may be disposed around the outer circumference of the fuse 50 without contacting the surface of the fuse 50 or spaced apart from the surface of the fuse 50 by a predetermined distance. The preset distance may be determined according to the working voltage of the circuit to be detected, for example: the higher the operating voltage, the greater the distance between the surface of the fuse 50 and the induction coil 40.
It should be noted that the circuit to be detected may be any circuit, such as: for convenience of description, the circuit to be detected is taken as an example to exemplify a charging or discharging circuit of the storage battery. And when the fuse 50 is fused, the circuit to be detected is powered off in view of the fact that the circuit to be detected is disconnected from the power supply terminal thereof, so that the working safety of the circuit to be detected is guaranteed.
In other words, the circuit to be tested may be a power supply circuit capable of supplying power to an external circuit, for example: and (4) a storage battery. In this case, the fuse 50 is connected in series to the power supply terminal of the circuit to be tested, and can be understood as: the fuse 50 is connected in series between the power output terminal of the power supply circuit and the external circuit, and if the fuse 50 is blown, the power supply circuit stops supplying power to the external circuit.
Of course, the circuit to be detected may also be a working circuit that can normally work only when a power supply needs to be obtained, and at this time, the fuse 50 is connected in series to the power supply end of the circuit to be detected, which can be understood as: the fuse 50 is connected in series between the external power source and the power input terminal of the operating circuit, and if the fuse 50 is blown, the operating circuit stops obtaining electric energy from the external power source, thereby stopping the operation.
Correspondingly, the detecting circuit for detecting an abnormality may include: the circuit to be detected has one or more of overcurrent fault, overvoltage fault, short-circuit fault, ground fault, overcharge fault of the storage battery, overdischarge fault of the storage battery and other abnormal conditions, and in practical application, the abnormal conditions can be preset according to the actual requirements of the circuit to be detected, so that the fault detection module 30 determines that the circuit to be detected is abnormal when detecting that the preset abnormal conditions exist in the circuit to be detected.
In addition, the power supply module 10 may include a battery, a power supply terminal connected to an external power supply, and may even multiplex the power supply of the circuit to be tested, which is not limited in detail herein. The fault detection module 30 may include any circuit, device, electronic component, or instrument capable of detecting faults of the circuit to be detected, for example: when the safety active fusing circuit provided by the embodiment of the present application is used for overvoltage protection of a circuit to be detected, the fault detection module 30 may include a voltmeter to trigger the power supply module 10 to supply a periodically changing current to the induction coil 40 when the voltage of the circuit to be detected exceeds a preset value, so as to fuse the fuse 50.
Of course, the corresponding preset abnormal conditions are different according to the different circuits to be detected, and in practical application, the fault detection module 30 capable of detecting the preset abnormal conditions may be selected according to the preset abnormal conditions, which is not specifically limited herein.
As an alternative embodiment, as shown in fig. 2, the power supply module 10 includes: a power supply Vb and a first switch 20;
the power Vb is electrically connected with the induction coil 40 through the first switch 20, and the second end of the fault detection module 30 is connected with the control end of the first switch 20;
when detecting that the circuit to be detected is abnormal, the fault detection module 30 controls the first switch 20 to be periodically turned on, so that the direction of the current flowing through the induction coil 40 is periodically changed.
In an alternative embodiment, the periodic conduction of the first switch 20 can be understood as: the first switch 20 is constantly switched between an off state and an on state. When the first switch 20 is turned on, the induction coil 40 is turned on with the power supply module 10, so that the current in the induction coil 40 is gradually increased; when the first switch 20 is turned off, the induction coil 40 is not conducted with the power supply module 10, so that the current in the induction coil 40 gradually decreases to 0. At this time, the direction of the current flowing through the induction coil 40 changes periodically, and it can be understood that: the current flowing through the induction coil 40 varies periodically between greater than 0 and equal to 0.
In another alternative embodiment, the fault detection module 30 further includes: an adjustment module 31;
the adjusting module 31 is connected between the first switch 20 and the induction coil 40;
under the action of the adjusting module 31, in one conducting period of the first switch, the direction of the current flowing through the induction coil 40 is switched between a first direction and a second direction at least once;
wherein the first direction is opposite to the second direction.
In a specific implementation, the first direction may be a direction from the first end of the induction coil 40 to the second end of the induction coil 40, and the second direction may be a direction from the second end of the induction coil 40 to the first end of the induction coil 40. Alternatively, the first direction may be a direction from the second end of the induction coil 40 to the first end of the induction coil 40, and the second direction may be a direction from the first end of the induction coil 40 to the second end of the induction coil 40, which is not particularly limited herein.
The adjusting module 31 may include at least one of a switching component, a capacitor, and the like capable of changing a current direction in the induction coil 40.
When the first switch 20 is periodically turned on, one on-period of the first switch 20 indicates a time between a time point when the first switch 20 is switched from the off state to the on state and a time point when the first switch 20 is switched from the on state to the off state. During this time, the direction of the magnetic induction lines generated by the induction coil 40 can be switched at least once by switching the direction of the current flowing through the induction coil 40 between the first direction and the second direction at least once, that is, during this time, the fuse 50 switches the magnetic induction lines generated by the induction coil 40 at least once.
Of course, in practical applications, an ac power supply or a dc power supply and other switching circuits may also be disposed in the power supply module 10 to realize the periodic change of the current direction flowing through the induction coil 40, which is not limited in this respect.
In practical applications, the faster the fuse 50 cuts the magnetic induction lines, the faster the fuse 50 heats up, thereby enabling the fuse 50 to blow faster. Optionally, in the embodiment of the present application, the frequency of controlling the first switch 20 to switch between the on state and the off state by the fault detection module 30 may be increased, or the temperature rising speed of the fuse 50 may be increased in the following manner, so as to increase the fusing speed of the fuse 50.
As an alternative embodiment, as shown in fig. 2, the adjusting module 31 may include a first capacitor 60;
a first end of the first capacitor 60 is connected with a first end of the power Vb, and a second end of the first capacitor 60 is connected with a second end of the power Vb through the first switch 20;
the induction coil 40 is connected in parallel with the first capacitor 60;
the direction of the current flowing through the induction coil 40 is a first direction when the first switch 20 is turned on, the first direction in a first period after the first switch 20 is turned off, and the second direction in a second period after the first switch 20 is turned off; the first time period is a charging time period of the first capacitor 60, and the second time period is a discharging time period of the first capacitor 60.
In a specific implementation, the first terminal of the power Vb may be a positive pole of the dc power, and the second terminal of the power Vb may be a negative pole of the dc power. Of course, the first terminal of the power Vb may be the negative electrode of the dc power, and the second terminal of the power Vb may be the positive electrode of the dc power.
In a specific implementation, the induction coil 40 is connected in parallel with the first capacitor 60 to form an LC resonant circuit, so that the current direction in the induction coil 40 can be switched between the first direction and the second direction continuously through the resonance generated by the LC resonant circuit.
It should be noted that, in practical applications, the induction coil 40 may be connected in series with the first capacitor 60 to communicate with the series LC resonant circuit, and the current direction in the induction coil 40 may be continuously switched between the first direction and the second direction through the resonance generated by the series LC resonant circuit, which is not limited in this respect.
Additionally, as in the embodiment shown in FIG. 2, the first direction may be a clockwise direction and the second direction may be a counterclockwise direction.
Specifically, as shown in fig. 2, when the first switch 20 is turned on, the power supply module 10, the induction coil 40, and the first switch 20 form a conductive loop, so that the current provided by the power supply module 10 flows into the induction coil 40 through one end of the induction coil 40, and the clockwise current in the induction coil 40 is gradually increased; when the first switch 20 is turned off, because the current in the induction coil 40 already has a clockwise current and the current in the induction coil 40 cannot suddenly change, the clockwise current in the induction coil 40 charges the first capacitor 60, when the first capacitor 60 is fully charged, the current in the first capacitor 60 becomes 0, and after the voltage difference between the two poles of the first capacitor 60 reaches the peak value, the first capacitor 60 starts to discharge, and the current in the discharge shape of the first capacitor 60 flows into the induction coil 40 from the other end of the induction coil 40, so that a counterclockwise current is formed between the induction coil 40 and the first capacitor 60, and the process is repeated, so that the current direction in the induction coil 40 is switched between the clockwise direction and the counterclockwise direction once or more until the electric energy is exhausted, or until the first switch 20 is turned on, the induction coil 40 obtains the clockwise current from the power supply unit 10 again, and repeats the above LC resonance process.
In practical application, when the first switch 20 is turned on, the first switch is used for enabling the power supply module 10 to store energy to the LC resonant circuit; when the first switch 20 is turned off, the LC resonant circuit resonates to continuously switch the direction of the current in the induction coil 40 between the first direction and the second direction.
Further, the first switch 20 may be in the on state for a time longer than the time when the first switch 20 is in the off state in the same on period.
Thus, when the first switch 20 is in a long off state, the LC resonant circuit may resonate many times, thereby reducing the power consumption of the power supply module 10 and reducing the switching frequency of the first switch 20.
As another alternative, the adjusting module 101 may further include a switch component, such as: the switch assembly includes a first state and a second state, in the first state, the switch assembly connects the first end of the first switch 20 with the first end of the induction coil 40, and connects the second end of the induction coil 40 with the first end of the power supply module 10; in the second state, the switch assembly connects the first terminal of the first switch 20 with the second terminal of the induction coil 40, and connects the first terminal of the induction coil 40 with the first terminal of the power supply module 10.
In this embodiment, the current direction in the induction coil 40 can be switched between the first direction and the second direction at least once by controlling the switch assembly to switch between the first state and the second state at least once in one on period of the first switch 20.
Optionally, the on period of the first switch 20 matches the charging and discharging period of the first capacitor 60.
In a specific implementation, the on period of the first switch 20 matches the charge-discharge period of the first capacitor 60, and it can be understood that: the off-time of the first switch 20 in one on-period is equal to an integral multiple of the time required for the first capacitor 60 to perform one charge and one discharge.
Thus, the efficiency of charging and discharging the first capacitor 60 can be improved, and the switching frequency of the current direction in the induction coil 40 can be improved, so that the fuse 50 can be blown out more quickly.
Optionally, the adjusting module 31 further includes: the LC resonance controller 311;
the LC resonance controller 311 is connected between the fault detection module 30 and the control terminal of the first switch 20;
in the event that the fault detection module 30 detects an abnormality in the circuit to be detected, the LC resonance controller 311 controls the first switch 20 to be periodically turned on.
In a specific implementation, the fault detection module 30 may send a first signal to the LC resonance controller 311 when detecting that the circuit to be detected is abnormal, so that the LC resonance controller 311 controls the first switch 20 to be periodically turned on based on the first signal.
In addition, the first switch 20 may be a transistor switch, for example: an Insulated Gate Bipolar Transistor (IGBT) tube.
In this way, the LC resonant controller 311 can control the source and the drain of the IGBT tube to be in a conducting state (i.e., the first switch is in a conducting state) or a turn-off state (i.e., the first switch is in a turn-off state) by controlling the gate voltage of the IGBT tube.
Optionally, as shown in fig. 2, the circuit to be detected includes a Battery to be detected (shown as Vb in fig. 2), and the fault detection module 30 includes a Battery Management System (BMS) module connected to the Battery to be detected Vb.
In this embodiment, the fuse active fusing circuit provided in this embodiment of the present application is configured to actively fuse the fuse 50 when the battery Vb to be detected is abnormally charged or discharged, so that the battery Vb to be detected stops being charged or discharged.
Optionally, as shown in fig. 2, the power supply module 10 multiplexes the battery Vb to be detected.
In this way, an independent power supply module 10 can no longer be provided for the fail-safe active fusing circuit, which simplifies the structural complexity of the fail-safe active fusing circuit.
Of course, in the specific implementation, the fuse active fusing circuit and the circuit to be detected may use independent power sources, respectively, so that when the circuit to be detected is powered off, the fuse active fusing circuit may still protect the circuit to be detected, for example: when the circuit to be detected suddenly receives a power supply after power failure, if a large impulse current or impulse voltage is generated, the fuse 50 can still be actively blown by using a fuse active blowing circuit of a different power supply module 10 with the circuit to be detected so as to protect the circuit to be detected.
Secondly, the fault detection module 30 and the LC resonance controller 311 may also obtain operating power from the power supply module 10 or the battery Vb to be detected.
In the embodiment of the application, the induction coil and the fuse are arranged correspondingly, so that the fuse is positioned in the electromagnetic field of the induction coil, and therefore when the fault detection module detects that the circuit to be detected is abnormal, the first switch is controlled to be periodically conducted, and the electromagnetic field of the induction coil can be periodically changed; and the fuse is located in the electromagnetic field of the induction coil, so that the magnetic induction line of the induction coil cuts the fuse, a vortex is formed in the fuse, the temperature is gradually increased under the action of the vortex until the fuse is fused, and the active fusing of the fuse is realized.
For convenience of illustration, the following embodiments take the fail-safe active fuse circuit shown in fig. 2 as an example, and illustrate the operation principle of the fail-safe active fuse circuit provided in the embodiments of the present application:
firstly, a battery Vb to be detected normally supplies power to the BMS and the LC resonance control module 311 to work;
secondly, when the BMS detects that the battery Vb to be detected is abnormal and the fuse 50 needs to be fused, the LC resonance control module 311 is started to start to actively heat and fuse the fuse 50;
third, the LC resonance control module 311 works, when the first switch 20 is turned on, the current flows through the induction coil 40, and the current rapidly rises, when the first switch 20 is turned off, the current does not suddenly change (i.e., the inductive reactance action) due to the inductive reactance of the induction coil 40, and the current of the induction coil 40 cannot immediately change to 0, so that the first capacitor 60 is charged, and the current becomes 0 after the first capacitor 60 is fully charged, at this time, the magnetic field energy of the induction coil 40 is completely converted into the electric field energy of the first capacitor 60, and left negative and right positive appear at both ends of the first capacitor 60, and the amplitude reaches the peak voltage, after the peak value, the first capacitor 60 is gradually discharged through the induction coil 40, and when the first switch 20 is turned off again, the above steps are repeated, and the induction coil 40 and the first capacitor 60 resonate.
Fourthly, the fuse 40 starts to be heated in a resonant mode, the magnetic induction lines of the induction coil 40 continuously cut the conductor of the fuse 40, countless small eddy currents are formed in the conductor of the fuse 40, the temperature of the fuse 40 can be continuously increased, and finally the fuse 40 is fused when the fusing temperature is reached.
An embodiment of the present application further provides an active fuse device, including: such as the fuse active blow circuit in the embodiment shown in fig. 1 or fig. 2.
In specific implementation, the safety active fusing device provided by the embodiment of the present application may be installed in a charging circuit and a discharging circuit of a battery, or may also be installed in other circuits that may need to provide power-off protection, and is not particularly limited herein. In addition, the active fuse blowing device provided in the embodiment of the present application has the active fuse blowing circuit in the embodiment shown in fig. 1 or fig. 2, so that the same beneficial effects as the active fuse blowing circuit in the embodiment shown in fig. 1 or fig. 2 can be produced, and further description is omitted herein for avoiding redundancy.
An embodiment of the present application further provides a battery pack, including: a battery to be tested and a fuse active fusing circuit as in the embodiment shown in fig. 1 or fig. 2.
In a specific implementation, a safety active fusing circuit as in the embodiment shown in fig. 1 or fig. 2 may be mounted at the power output terminal and/or the power input terminal of the battery to be detected, so as to protect the charging and/or discharging process of the battery to be detected through the safety active fusing circuit as in the embodiment shown in fig. 1 or fig. 2.
The fuse active blowing apparatus provided in the embodiment of the present application has the fuse active blowing circuit in the embodiment shown in fig. 1 or fig. 2, so that the same beneficial effects as the fuse active blowing circuit in the embodiment shown in fig. 1 or fig. 2 can be produced, and further description is omitted herein for avoiding repetition.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A fail-safe active blow out circuit, comprising: the device comprises a power supply module, a fault detection module, an induction coil and a fuse;
the induction coil is arranged corresponding to the fuse, the power supply module is electrically connected with the induction coil, the first end of the fault detection module is connected with a circuit to be detected, the second end of the fault detection module is connected with the control end of the power supply module, and the fuse is connected in series with the power supply end of the circuit to be detected;
and the fault detection module controls the power supply module to supply current with periodically changed current direction to the induction coil when detecting that the circuit to be detected is abnormal, so that the fuse cuts the magnetic induction lines generated by the induction coil and generates temperature rise until the fuse is fused under the action of the temperature rise.
2. The circuit of claim 1, wherein the power supply module comprises: a power supply and a first switch;
the power supply is electrically connected with the induction coil through the first switch, and the second end of the fault detection module is connected with the control end of the first switch;
and the fault detection module controls the first switch to be periodically conducted under the condition that the circuit to be detected is detected to be abnormal, so that the direction of current flowing through the induction coil is periodically changed.
3. The circuit of claim 2, wherein the fault detection module further comprises: an adjustment module;
the adjusting module is connected between the first switch and the induction coil;
under the action of the adjusting module, in one conducting period of the first switch, the direction of current flowing through the induction coil is switched between a first direction and a second direction at least once;
wherein the first direction is opposite to the second direction.
4. The circuit of claim 3, wherein the adjustment module comprises: a first capacitor;
the first end of the first capacitor is connected with the first end of the power supply, and the second end of the first capacitor is connected with the second end of the power supply through the first switch;
the induction coil is connected with the first capacitor in parallel;
the direction of current flowing through the induction coil is a first direction when the first switch is turned on, the first direction in a first time period after the first switch is turned off, and the second direction in a second time period after the first switch is turned off; the first time period is a charging time period of the first capacitor, and the second time period is a discharging time period of the first capacitor.
5. The circuit of claim 4, wherein the adjustment module further comprises: an LC resonance controller;
the LC resonance controller is connected between the fault detection module and the control end of the first switch;
and under the condition that the fault detection module detects that the circuit to be detected is abnormal, the LC resonance controller controls the first switch to be periodically conducted.
6. The circuit of claim 5, wherein a conduction period of the first switch matches a charge-discharge period of the first capacitor.
7. The circuit according to any of claims 1 to 5, characterized in that the circuit to be tested comprises a battery to be tested, and the fault detection module comprises a battery management system module BMS connected to the battery to be tested.
8. The circuit of claim 7, wherein the power module multiplexes the battery to be tested.
9. A fail-safe active blow-out device comprising the fail-safe active blow-out circuit of any of claims 1 to 8.
10. A battery pack comprising a battery to be tested and the safety active blow out circuit of any of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110942070.9A CN113484766B (en) | 2021-08-17 | Safety active fusing circuit, device and battery assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110942070.9A CN113484766B (en) | 2021-08-17 | Safety active fusing circuit, device and battery assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113484766A true CN113484766A (en) | 2021-10-08 |
| CN113484766B CN113484766B (en) | 2024-09-27 |
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