CN113839450A - Battery short-circuit protection circuit, battery and unmanned aerial vehicle - Google Patents
Battery short-circuit protection circuit, battery and unmanned aerial vehicle Download PDFInfo
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- CN113839450A CN113839450A CN202111274260.4A CN202111274260A CN113839450A CN 113839450 A CN113839450 A CN 113839450A CN 202111274260 A CN202111274260 A CN 202111274260A CN 113839450 A CN113839450 A CN 113839450A
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- 238000005070 sampling Methods 0.000 claims abstract description 21
- 238000004891 communication Methods 0.000 claims abstract description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 239000002360 explosive Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
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- 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
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- 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
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Abstract
The embodiment of the invention provides a battery short-circuit protection circuit, a battery and an unmanned aerial vehicle, which comprise a current sampling unit, a switch unit, a short-circuit protection unit, an input unit and a control unit; the short-circuit protection unit is also in communication connection with the control unit, and the output end of the input unit is connected with the first end of the control unit; when the battery pack is in short circuit, the short-circuit protection unit outputs a turn-off signal to the switch unit to enable the switch unit to break off a working circuit of the battery pack, and only after a user inputs a short-circuit removing signal, the control unit sends a conducting instruction to the short-circuit protection unit to enable the short-circuit protection unit to control the switch unit to be conducted, so that the reliability of short-circuit protection is improved, and the damage to the switch unit is effectively reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of batteries, in particular to a battery short-circuit protection circuit, a battery and an unmanned aerial vehicle.
Background
With the wide application of lithium batteries, the safety problem of batteries is more and more prominent. Fields such as unmanned aerial vehicle, model aeroplane and model ship are owing to need quick maneuver, often can use the lithium cell of higher explosive power. The high explosive power battery also means that lower internal resistance of the battery, higher discharge rate and the like are needed, correspondingly higher requirements are also put forward on a battery management system, and especially higher requirements are put forward on short circuit setting with the largest influence on the safety of the battery.
The conventional battery short-circuit protection chip generally can be automatically recovered after a period of time delay after battery short-circuit protection aiming at the short circuit of the battery, namely after the battery loop switch is disconnected by triggering short-circuit protection, the battery loop switch is automatically opened after a period of time delay, however, the protection mode can be continuously recovered before short-circuit fault is not relieved, the reliability of the short-circuit protection is low, and long-time short circuit can cause damage to the loop switch and even fail. When the high explosive force battery is short-circuited, the destructive effect is more obvious.
Disclosure of Invention
The embodiment of the invention mainly provides a battery short-circuit protection circuit, a battery and an unmanned aerial vehicle, which can improve the reliability of short-circuit protection and effectively reduce the damage to a switch unit.
In a first aspect, an embodiment of the present invention provides a battery short-circuit protection circuit, including: the device comprises a current sampling unit, a switching unit, a short-circuit protection unit, an input unit and a control unit;
the short-circuit protection device comprises a switch unit, a current sampling unit, a short-circuit protection unit, a control unit and an input unit, wherein the switch unit is used for being connected with a first end and a first output end of a battery pack respectively, the current sampling unit is used for being connected with a second end and a second output end of the battery pack respectively, the current sampling unit is also connected with the first end of the short-circuit protection unit, the second end of the short-circuit protection unit is connected with the control end of the switch unit, the short-circuit protection unit is also in communication connection with the control unit, and the output end of the input unit is connected with the first end of the control unit;
the current sampling unit is used for collecting the working current of the battery pack and outputting the working current to the short-circuit protection unit; the short-circuit protection unit is used for determining whether the battery pack is in a short-circuit state according to the working current and outputting a turn-off signal to the switch unit when the battery pack is in the short-circuit state; the switch unit is used for disconnecting the connection between the first end of the battery pack and the first output end according to the turn-off signal;
the input unit is used for receiving a short circuit removing signal input by a user and outputting the short circuit removing signal to the control unit; the control unit is used for sending a conduction instruction to the short-circuit protection unit according to the short-circuit release signal; the short-circuit protection unit is used for outputting a conducting signal to the switch unit according to the conducting instruction; the switch unit is used for conducting connection between the first end of the battery pack and the first output end according to the conducting signal.
In some embodiments, the short-circuit protection unit is further configured to send short-circuit information to the control unit every preset time when the battery pack is in a short-circuit state; the control unit is further configured to send a turn-off instruction to the short-circuit protection unit according to the number of times of the received short-circuit information, and send the turn-on instruction to the short-circuit protection unit when receiving the short-circuit release signal after sending the turn-off instruction; the short-circuit protection unit is also used for outputting the turn-off signal to the switch unit according to the turn-off instruction.
In some embodiments, the battery short-circuit protection circuit further comprises a voltage stabilization unit;
the input end of the voltage stabilizing unit is connected with the first end of the battery pack, and the output end of the voltage stabilizing unit is connected with the power supply end of the control unit.
In some embodiments, the battery short protection circuit further comprises a display unit;
the display unit is connected with the third end of the control unit and used for displaying whether the battery pack is in a short-circuit state or not.
In some embodiments, the output terminal of the voltage regulation unit is further connected to the power supply terminal of the input unit and the power supply terminal of the display unit, respectively.
In some embodiments, the control unit is further configured to output a first display signal to the display unit when the shutdown instruction is sent to the short-circuit protection unit, and the display unit is configured to display that the battery pack is in a short-circuit state according to the first display signal.
In some embodiments, the control unit is further configured to output a second display signal to the display unit when the conduction instruction is sent to the short-circuit protection unit, and the display unit is configured to display that the battery pack is in a short-circuit release state according to the second display signal.
In some embodiments, the control unit is configured to send the turn-off instruction to the short-circuit protection unit when the number of times of receiving the short-circuit information is greater than or equal to a preset threshold.
In a second aspect, an embodiment of the present invention further provides a battery, including the battery short-circuit protection circuit according to any one of the first aspects.
In a third aspect, an embodiment of the present invention further provides an unmanned aerial vehicle, including the battery according to the second aspect.
The beneficial effects of the embodiment of the invention are as follows: different from the situation of the prior art, the embodiment of the invention provides a battery short-circuit protection circuit, a battery and an unmanned aerial vehicle, which comprise a current sampling unit, a switch unit, a short-circuit protection unit, an input unit and a control unit; the short-circuit protection unit is also in communication connection with the control unit, and the output end of the input unit is connected with the first end of the control unit; when the battery pack is in short circuit, the short-circuit protection unit outputs a turn-off signal to the switch unit to enable the switch unit to break off a working circuit of the battery pack, and only after a user inputs a short-circuit removing signal, the control unit sends a conducting instruction to the short-circuit protection unit to enable the short-circuit protection unit to control the switch unit to be conducted, so that the reliability of short-circuit protection is improved, and the damage to the switch unit is effectively reduced.
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One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic diagram illustrating a short-circuit protection circuit of a battery according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another battery short-circuit protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a structure of a battery short-circuit protection circuit according to another embodiment of the present invention;
fig. 4 is a schematic diagram of a working flow of a battery short-circuit protection circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.
In a first aspect, an embodiment of the present invention provides a battery short-circuit protection circuit, referring to fig. 1, the battery short-circuit protection circuit 100 includes: the circuit comprises a current sampling unit 10, a switching unit 20, a short-circuit protection unit 30, an input unit 40 and a control unit 50. The switching unit 20 is configured to be connected to a first end and a first output end 310 of the battery pack 200, respectively, the current sampling unit 10 is configured to be connected to a second end and a second output end 320 of the battery pack 200, respectively, the current sampling unit 10 is further connected to a first end of the short-circuit protection unit 30, the second end of the short-circuit protection unit 30 is connected to a control end of the switching unit 20, the short-circuit protection unit 30 is further connected to the control unit 50 in a communication manner, and an output end of the input unit 40 is connected to the first end of the control unit 50. The current sampling unit 10 is configured to collect a working current of the battery pack 200 and output the working current to the short-circuit protection unit 30; the short-circuit protection unit 30 is configured to determine whether the battery pack 200 is in a short-circuit state according to the operating current, and output a turn-off signal to the switching unit 20 when the battery pack 200 is in the short-circuit state; the switching unit 20 serves to disconnect the connection between the first terminal of the battery pack 200 and the first output terminal 310 according to the off signal; the input unit 40 is used for receiving a short circuit release signal input by a user and outputting the short circuit release signal to the control unit 50; the control unit 50 is configured to send a conduction instruction to the short-circuit protection unit 30 according to the short-circuit release signal; the short-circuit protection unit 30 is configured to output a conducting signal to the switch unit 20 according to the conducting instruction; the switching unit 20 serves to turn on the connection between the first terminal of the battery pack 200 and the first output terminal 310 according to the turn-on signal.
Specifically, the current sampling unit 10 may include a sampling resistor, which is connected in series between the second end of the battery pack 200 and the second output end 320, and is configured to collect the working current of the working circuit of the battery pack 200 and output the working current to the short-circuit protection unit 30. The short-circuit protection unit 30 may be any suitable short-circuit protection chip or short-circuit protection circuit in the prior art, and may be used to implement the short-circuit protection function of the battery pack.
In the battery short-circuit protection circuit, firstly, when the first output terminal 310 and the second output terminal 320 form the output port 300, and when the output port 300 is connected with a load or a power grid, the battery pack 200 can form a working loop of the battery pack 200 through the switch unit 20, the first output terminal 310, the load/power grid, the second output terminal 320 and the current sampling unit 10, so that charging and discharging of the battery pack 200 can be realized; then, the short-circuit protection unit 30 obtains the working current of the battery pack 200 during the charging and discharging operations, and if the battery pack 200 is determined to be in the short-circuit state according to the working current, the short-circuit protection unit 30 outputs a turn-off signal to the switch unit 20, so that the switch unit 20 disconnects the connection between the first end of the battery pack 200 and the first output end 310, and the working circuit of the battery pack 200 is disconnected; then, after the short-circuit fault is eliminated, the user inputs a short-circuit removing signal through the input unit 40, and the control unit 50 sends a conduction instruction to the short-circuit protection unit 30 after receiving the short-circuit removing signal; then, the short-circuit protection unit 30 sends a conduction signal to the switch unit 20 according to the conduction instruction, so that the switch unit 20 conducts the connection between the first end of the battery pack 200 and the first output end 310, the operating circuit of the battery pack 200 is conducted again, and the battery pack 200 enters normal operation again.
Therefore, in the battery short-circuit protection circuit, when the short-circuit protection of the battery pack is triggered, the short-circuit protection unit does not automatically turn on the switch unit after the switch unit is turned off, and only when the control unit sends a turn-on instruction to the short-circuit protection unit after a fault removing signal is input by a user, the short-circuit protection unit outputs a turn-on signal to turn on the switch unit. Through the short-circuit protection mode, the battery pack can be guaranteed to work again after the short-circuit fault is completely removed, the safety of the battery pack in short circuit is improved, the damage of short-circuit current to the switch unit is effectively reduced, and the use safety of the battery pack is improved.
Specifically, the battery pack 200 may be a parallel battery pack formed by connecting a plurality of battery cells in parallel, or a series battery pack formed by connecting a plurality of battery cells in series, or a series-parallel battery pack formed by connecting a plurality of battery cells in series and parallel. The battery pack 200 includes at least one high-rate cell, which is a cell having a discharge rate exceeding 1C. The first end of the battery is typically the positive pole of the battery and the second end of the battery is typically the negative pole of the battery. The first output terminal 310 and the second output terminal 320 are both used for connecting a load or a power grid, and generally, the first output terminal 310 is a positive output terminal, and the second output terminal 320 is a negative output terminal. In practical applications, the polarities of the first end of the battery pack, the second end of the battery pack, the first output end and the second output end can be set according to actual needs, and the limitation in the embodiment is not required.
In some embodiments, the control unit may be an STM8, STM16, STM32 series or any other suitable microprocessor controller, which is used for receiving and outputting data, and may be freely set in practical application, and is not limited herein.
In some of these embodiments, the switching unit comprises at least one switching tube. Specifically, the switch unit includes first switch tube and second switch tube, and the first end of group battery is connected to the first end of first switch tube, and the first end of second switch tube is connected to the second end of first switch tube, and first output is connected to the second end of second switch tube, and the control end of first switch tube and the control end of second switch tube all connect short-circuit protection unit. For example, the first switch tube comprises a first PMOS tube, and the second switch tube comprises a second PMOS tube; the drain electrode of first PMOS pipe connects the first end of group battery, the source electrode of first PMOS pipe connects the source electrode of second PMOS pipe, first output is connected to the drain electrode of second PMOS pipe, short-circuit protection unit is all connected to the grid of first PMOS pipe and the grid of second PMOS pipe, the normal charge-discharge of group battery can be realized to the MOS pipe through two reverse series connections, and because first PMOS pipe and second PMOS pipe all have an internal diode, can prevent that the electric current from flowing backward, make the group battery can be safer when charging and discharging. In practical application, the number of the switching tubes may be set according to actual needs, and the types of the switching tubes may be NMOS tubes, triodes, IGBT tubes, relays, or any other suitable switching devices, which need not be limited in this embodiment.
In some of these embodiments, the input unit includes a key, an input screen, and/or a microphone. Specifically, when the input unit includes a key, the output end of the key is connected to the first end of the control unit, and the key is used for outputting a short-circuit release signal to the control unit when being pressed by a user. In practical applications, the input unit may also be any other suitable input device, which is not limited herein.
In order to improve the reliability of the battery short-circuit protection, in some embodiments, the short-circuit protection unit is further configured to send short-circuit information to the control unit every preset time when the battery pack is in a short-circuit state; the control unit is also used for sending a turn-off instruction to the short-circuit protection unit according to the number of times of the received short-circuit information, and sending a turn-on instruction to the short-circuit protection unit when receiving a short-circuit release signal after sending the turn-off instruction; the short-circuit protection unit is also used for outputting a turn-off signal to the switch unit according to the turn-off instruction.
Then, in the battery short-circuit protection circuit, if the short-circuit protection unit determines that the battery pack is in a short-circuit state according to the working current, on one hand, the short-circuit protection unit outputs a turn-off signal to the switch unit to enable the switch unit to break the connection between the first end and the first output end of the battery pack and break a working loop of the battery pack, and on the other hand, the short-circuit protection unit also sends short-circuit information to the control unit once every preset time; then, the control unit counts the times of the received short-circuit information and sends a turn-off instruction to the short-circuit protection unit according to the counted times, so that the short-circuit protection unit outputs a turn-off signal to the switch unit after receiving the turn-off instruction, and the switch unit continues to keep a disconnected state, namely a working circuit of the battery pack keeps the disconnected state; and finally, after the short-circuit fault is eliminated, a user inputs a short-circuit removing signal through the input unit, the control unit sends a switching-on command to the short-circuit protection unit after sending a switching-off command and if receiving the short-circuit removing signal, and the short-circuit protection unit switches on the switch unit according to the switching-on command, so that the working circuit of the battery pack is switched on again.
It can be seen that, in the battery short-circuit protection circuit, when the short-circuit protection of the battery pack is triggered, the short-circuit protection unit outputs a turn-off signal to the switch unit on one hand and sends short-circuit information to the control unit on the other hand, the control unit sends a turn-off command to the short-circuit protection unit according to the number of short-circuits received, so that the short-circuit protection unit outputs a turn-off signal to the switch unit, only when a user inputs a fault release signal, the control unit sends a turn-on command to the short-circuit protection unit, thereby further ensuring that the control unit sends a turn-off command to the switch unit after receiving a certain number of short-circuit information, thereby ensuring that the switch unit is continuously in a turn-off state, and only after receiving the fault release signal of the user, the short-circuit protection unit turns on the switch unit, thereby ensuring that the battery pack is in a short-circuit, the switch unit is always in a reliable off state, namely, the battery short-circuit protection circuit improves the reliability and safety of short-circuit protection of the battery pack.
In some embodiments, the control unit is configured to send a turn-off instruction to the short-circuit protection unit when the number of times of receiving the short-circuit information is greater than or equal to a preset threshold. Typically, the preset threshold should be greater than or equal to 1. In practical applications, the preset threshold may be set according to actual needs, and is not limited herein.
In some embodiments, the communication connection between the control unit and the short-circuit protection unit may be a bluetooth communication connection, a WiFi communication connection, a cellular communication connection, or any other suitable wireless communication connection. In other embodiments, the communication connection between the control unit and the short-circuit protection unit is a wired communication connection.
In some embodiments, referring to fig. 2, the battery short-circuit protection circuit further includes a voltage stabilizing unit 60; the input terminal of the voltage stabilizing unit 60 is connected to the first terminal of the battery pack 200, and the output terminal of the voltage stabilizing unit 60 is connected to the power supply terminal of the control unit 50. The voltage stabilizing unit 60 can be used to stabilize the output voltage output by the battery pack 200, and the voltage stabilizing unit 60 can ensure that the power supply voltage output by the battery pack 200 to the control unit 50 is stable, so as to prevent the control unit 50 from abnormal or malfunctioning due to voltage fluctuation. Specifically, the voltage regulation unit 60 may be a linear voltage regulation power supply circuit, a switching voltage regulation power supply circuit, or any suitable circuit in the prior art that can be used to output a stable power supply, and is not limited herein.
Specifically, in some embodiments, please continue to refer to fig. 2, the output terminal of the voltage stabilizing unit 60 is further connected to the power supply terminal of the input unit 40. In this way, the regulated power output by the voltage regulation unit 60 can also supply power to the input unit 40.
In some embodiments, referring to fig. 2 again, the battery short-circuit protection circuit further includes a display unit 70; the display unit 70 is connected to the third terminal of the control unit 50, and the display unit 70 is used for displaying whether the battery pack 200 is in a short-circuit state. Specifically, the display unit 70 may be a display screen or any other suitable display device, and is not limited herein.
Further, in some embodiments, the display unit may be further configured to display a charge parameter of the battery pack. For example, the control unit is connected with the battery pack, and the control unit acquires the electric quantity parameter of the battery pack and sends the electric quantity parameter information of the battery pack to the display unit so that the display unit displays the electric quantity parameter. Specifically, the electric quantity parameter may be battery parameters such as battery electric quantity, voltage, and battery model.
In some embodiments, referring to fig. 2, the output terminal of the voltage regulation unit 60 further indicates the power supply terminal of the unit 70. Thus, the regulated power output by the voltage regulation unit 60 can also supply power to the display unit 70.
In some embodiments, the control unit is further configured to output a first display signal to the display unit when sending the turn-off command to the short-circuit protection unit, and the display unit is configured to display that the battery pack is in a short-circuit state according to the first display signal.
Then, in the battery short-circuit protection circuit, if the short-circuit protection unit determines that the battery pack is in a short-circuit state according to the working current, on one hand, the short-circuit protection unit outputs a turn-off signal to the switch unit to enable the switch unit to break off a working loop of the battery pack, and on the other hand, the short-circuit protection unit also sends short-circuit information to the control unit once every preset time; then, the control unit counts the times of the received short-circuit information, sends a turn-off instruction to the short-circuit protection unit according to the counted times, and simultaneously outputs a first display signal to the display unit, and the display unit displays that the battery pack is in a short-circuit state according to the first display signal, so that a user can be reminded of needing to carry out short-circuit fault removal work at the moment. Therefore, in the battery short-circuit protection circuit, when the battery pack triggers short-circuit protection, the display unit displays that the battery pack is in a short-circuit state, so that the working state of the battery pack can be visualized, and a user can quickly know that the battery pack is in the short-circuit state after the battery pack has a short-circuit fault.
In some embodiments, the control unit is further configured to output the first display signal all the time if the short-circuit release signal is not received all the time after the turn-off instruction is sent to the short-circuit protection unit, so that the display unit always displays that the battery pack is in the short-circuit state.
In some embodiments, the control unit is further configured to output a second display signal to the display unit when the conduction command is sent to the short-circuit protection unit, and the display unit is configured to display that the battery pack is in a short-circuit release state according to the second display signal.
Then, in the battery short-circuit protection circuit, after the control unit sends a turn-off instruction, a user can input a short-circuit removing signal through the input unit after the short-circuit fault is removed, and after the control unit receives the short-circuit removing signal, on one hand, a turn-on instruction is sent to the short-circuit protection unit, so that the short-circuit protection unit controls the switch unit to be turned on, and the working circuit of the battery pack is turned on again; on the other hand, after receiving the short circuit release signal, the control unit also outputs a second display signal to the display unit, and at the moment, the display unit displays that the battery pack is in a short circuit release state according to the second display signal, so that the visualization degree of the battery short circuit protection circuit is improved.
In some embodiments, referring to fig. 3, the battery short-circuit protection circuit further includes an alarm unit 80, and the alarm unit 80 is connected to the fourth terminal of the control unit 50. Specifically, when the control unit 50 sends a turn-off command, the control unit 50 further sends an alarm signal to the alarm unit 80, so that the alarm unit 80 gives an alarm to prompt the user that the battery pack 200 is in a fault state at this time, and when the control unit 50 sends a turn-on command, the control unit 50 further sends a warning-removing signal to the alarm unit 80, so that the alarm unit 80 removes the alarm.
In some of these embodiments, the alarm unit 80 includes an acoustic alarm, a light alarm, a vibration alarm, and/or a display screen alarm. In practical application, the alarm unit may also be any other suitable alarm device, and the specific control process of the alarm device by the control unit may refer to the prior art, which is not limited herein.
In some of these embodiments, the alarm unit is further connected to the output of the voltage stabilization unit. Therefore, the stabilized voltage power supply output by the voltage stabilizing unit can also supply power for the alarm unit.
In some embodiments, referring to fig. 2 or fig. 3, the third terminal of the short-circuit protection unit 30 is further connected to the first terminal of the battery pack 200. The short-circuit protection unit 30 is further configured to obtain battery parameters.
The specific operation of the battery provided by the embodiment of the present invention is described in detail below with reference to the charging system shown in fig. 2.
Referring to fig. 2 and 4, in the battery short-circuit protection circuit, firstly, when the first output terminal 310 and the second output terminal 320 are connected to a load or a power grid, the battery pack 200 may form a working loop of the battery pack 200 through the loop switch, the first output terminal 310, the load/power grid, the second output terminal 320 and the current sampling unit 10, so that normal charging and discharging of the battery pack 200 may be realized. Then, the short-circuit protection unit 30 obtains the working current of the battery pack 200 during the charging and discharging operations, and if the battery pack 200 is determined to be in the short-circuit state according to the working current, on one hand, the short-circuit protection unit 30 outputs a turn-off signal to the switch unit 20, so that the switch unit 20 disconnects the connection between the first end and the first output end 310 of the battery pack 200, the working circuit of the battery pack 200 is disconnected, and the short-circuit protection function is realized; on the other hand, the short-circuit protection unit 30 also sends short-circuit information to the control unit 50 once every preset time.
Then, the control unit 50 counts the number of times of the received short-circuit information, and when the number of times exceeds a preset threshold, on one hand, the control unit 50 sends a turn-off instruction to the short-circuit protection unit 30, so that after the short-circuit protection unit 30 receives the turn-off instruction, a turn-off signal is output to the switch unit 20, so that the switch unit 20 continues to keep a disconnected state, that is, a working circuit of the battery pack 200 keeps a disconnected state, and when the short circuit of the battery pack 200 is realized, the switch unit 20 is reliably disconnected; on the other hand, the control unit 50 further outputs a first display signal to the display unit 70, and the display unit 70 displays that the battery pack 200 is in a short-circuit state according to the first display signal, so that the user can be reminded that the short-circuit fault removal work needs to be performed at this time.
Finally, after the control unit 50 sends the turn-off instruction, if the user inputs a short-circuit release signal through the input unit 40, the control unit 50 receives the short-circuit release signal, on one hand, the control unit 50 sends a conduction instruction to the short-circuit protection unit 30, the short-circuit protection unit 30 sends a conduction signal to the switch unit 20 according to the conduction instruction, so that the switch unit 20 conducts the connection between the first end and the first output end 310 of the battery pack 200, so that the operating circuit of the battery pack 200 is conducted again, and the battery pack 200 enters normal operation again, on the other hand, the control unit 50 also outputs a second display signal to the display unit 70, and at this time, the display unit 70 displays that the battery pack 200 is in a short-circuit release state according to the second display signal, so as to improve the visualization degree of the battery short-circuit protection circuit. If the user has not input the short release signal through the input unit 40 after the control unit 50 transmits the turn-off command, i.e., the control unit 50 has not received the short release signal, the display unit 70 will always display that the battery pack 200 is in the short state.
In conclusion, the short-circuit protection circuit for the battery has high reliability of short-circuit protection, and can effectively reduce the damage to the switch unit.
In a second aspect, an embodiment of the present invention further provides a battery, where the battery includes the battery short-circuit protection circuit according to any one of the first aspect. When the battery pack is short-circuited, the short-circuit protection unit outputs a turn-off signal to the switch unit to enable the switch unit to break off a working circuit of the battery pack, and only after a user inputs a short-circuit removing signal, the control unit sends a conducting instruction to the short-circuit protection unit to enable the short-circuit protection unit to control the switch unit to be conducted, so that the reliability of short-circuit protection is improved, and the damage to the switch unit is effectively reduced.
In a third aspect, an embodiment of the present invention further provides a drone, where the drone includes the battery according to the second aspect. This unmanned aerial vehicle is when the group battery short circuit, and short-circuit protection unit output turn-off signal to switch element makes the working circuit of switch element disconnection group battery, and only after the user input short circuit removes the signal, the control unit just sends the instruction of switching on to short-circuit protection unit, makes short-circuit protection unit control switch element switch on to improve short-circuit protection's reliability and effectively reduce the damage to switch element.
The embodiment of the invention provides a battery short-circuit protection circuit, a battery and an unmanned aerial vehicle, which comprise a current sampling unit, a switch unit, a short-circuit protection unit, an input unit and a control unit; the short-circuit protection unit is also in communication connection with the control unit, and the output end of the input unit is connected with the first end of the control unit; when the battery pack is in short circuit, the short-circuit protection unit outputs a turn-off signal to the switch unit to enable the switch unit to break off a working circuit of the battery pack, and only after a user inputs a short-circuit removing signal, the control unit sends a conducting instruction to the short-circuit protection unit to enable the short-circuit protection unit to control the switch unit to be conducted, so that the reliability of short-circuit protection is improved, and the damage to the switch unit is effectively reduced.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A battery short protection circuit, comprising: the device comprises a current sampling unit, a switching unit, a short-circuit protection unit, an input unit and a control unit;
the short-circuit protection device comprises a switch unit, a current sampling unit, a short-circuit protection unit, a control unit and an input unit, wherein the switch unit is used for being connected with a first end and a first output end of a battery pack respectively, the current sampling unit is used for being connected with a second end and a second output end of the battery pack respectively, the current sampling unit is also connected with the first end of the short-circuit protection unit, the second end of the short-circuit protection unit is connected with the control end of the switch unit, the short-circuit protection unit is also in communication connection with the control unit, and the output end of the input unit is connected with the first end of the control unit;
the current sampling unit is used for collecting the working current of the battery pack and outputting the working current to the short-circuit protection unit; the short-circuit protection unit is used for determining whether the battery pack is in a short-circuit state according to the working current and outputting a turn-off signal to the switch unit when the battery pack is in the short-circuit state; the switch unit is used for disconnecting the connection between the first end of the battery pack and the first output end according to the turn-off signal;
the input unit is used for receiving a short circuit removing signal input by a user and outputting the short circuit removing signal to the control unit; the control unit is used for sending a conduction instruction to the short-circuit protection unit according to the short-circuit release signal; the short-circuit protection unit is used for outputting a conducting signal to the switch unit according to the conducting instruction; the switch unit is used for conducting connection between the first end of the battery pack and the first output end according to the conducting signal.
2. The battery short-circuit protection circuit of claim 1, wherein the short-circuit protection unit is further configured to send short-circuit information to the control unit every preset time when the battery pack is in a short-circuit state; the control unit is further configured to send a turn-off instruction to the short-circuit protection unit according to the number of times of the received short-circuit information, and send the turn-on instruction to the short-circuit protection unit when receiving the short-circuit release signal after sending the turn-off instruction; the short-circuit protection unit is also used for outputting the turn-off signal to the switch unit according to the turn-off instruction.
3. The battery short-circuit protection circuit according to claim 2, further comprising a voltage stabilizing unit;
the input end of the voltage stabilizing unit is connected with the first end of the battery pack, and the output end of the voltage stabilizing unit is connected with the power supply end of the control unit.
4. The battery short-circuit protection circuit according to claim 3, further comprising a display unit;
the display unit is connected with the third end of the control unit and used for displaying whether the battery pack is in a short-circuit state or not.
5. The battery short-circuit protection circuit according to claim 4, wherein the output terminal of the voltage stabilization unit is further connected to the power supply terminal of the input unit and the power supply terminal of the display unit, respectively.
6. The battery short-circuit protection circuit according to claim 4 or 5, wherein the control unit is further configured to output a first display signal to the display unit when the shutdown instruction is sent to the short-circuit protection unit, and the display unit is configured to display that the battery pack is in a short-circuit state according to the first display signal.
7. The battery short-circuit protection circuit of claim 6, wherein the control unit is further configured to output a second display signal to the display unit when the conduction command is sent to the short-circuit protection unit, and the display unit is configured to display that the battery pack is in a short-circuit release state according to the second display signal.
8. The battery short-circuit protection circuit according to any one of claims 1 to 5, wherein the control unit is configured to send the turn-off instruction to the short-circuit protection unit when the number of times of receiving the short-circuit information is greater than or equal to a preset threshold.
9. A battery comprising a battery short-circuit protection circuit according to any one of claims 1 to 8.
10. A drone, characterized in that it comprises a battery according to claim 9.
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| CN202111274260.4A CN113839450A (en) | 2021-10-29 | 2021-10-29 | Battery short-circuit protection circuit, battery and unmanned aerial vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111274260.4A CN113839450A (en) | 2021-10-29 | 2021-10-29 | Battery short-circuit protection circuit, battery and unmanned aerial vehicle |
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| CN216649257U (en) * | 2021-10-29 | 2022-05-31 | 深圳市道通智能航空技术股份有限公司 | Battery short-circuit protection circuit, battery and unmanned aerial vehicle |
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- 2021-10-29 CN CN202111274260.4A patent/CN113839450A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH114150A (en) * | 1997-06-11 | 1999-01-06 | Toshiba Corp | Semiconductor device and power conversion device using the semiconductor device |
| CN101593961A (en) * | 2009-07-07 | 2009-12-02 | 中国科学技术大学 | DC power supply short-circuit protection circuit based on contactless current sample |
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