CN217386938U - Circuit breaker, power battery system and electric automobile - Google Patents
Circuit breaker, power battery system and electric automobile Download PDFInfo
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- CN217386938U CN217386938U CN202221436267.1U CN202221436267U CN217386938U CN 217386938 U CN217386938 U CN 217386938U CN 202221436267 U CN202221436267 U CN 202221436267U CN 217386938 U CN217386938 U CN 217386938U
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- 238000010791 quenching Methods 0.000 claims description 4
- 230000000171 quenching effect Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 230000000977 initiatory effect Effects 0.000 claims 2
- 238000010891 electric arc Methods 0.000 description 9
- 238000004880 explosion Methods 0.000 description 6
- 239000003721 gunpowder Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 239000012943 hotmelt Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
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- 230000000694 effects Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 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
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Abstract
The utility model discloses a circuit breaker, a power battery system and an electric automobile, wherein the circuit breaker comprises a first high-voltage interface for connecting a battery; the second high-voltage interface is used for accessing a power load; the circuit breaker is arranged between the first high-voltage interface and the second high-voltage interface in series to form a high-voltage loop; and the arc extinguishing device is arranged in parallel with the circuit breaker and is used for being electrically connected with the first high-voltage interface and the second high-voltage interface when the circuit breaker breaks off the electrical connection between the first high-voltage interface and the second high-voltage interface so as to form an arc extinguishing loop. The utility model discloses reduce the noise of open circuit protector, improved the life of open circuit protection device and the security of vehicle.
Description
Technical Field
The utility model relates to a protection technical field that opens circuit, in particular to protector, power battery system and electric automobile break.
Background
With the development of new energy timing, new energy power batteries are also increasingly applied to power vehicles, and circuit-breaking protection components are also increasingly applied to power battery systems. However, as the voltage level of the power battery of the new energy automobile is higher and the charging power is higher and higher, harmful electric arcs may be generated in the process of cutting off the short circuit loop by the circuit breaking protection device, and the service life of the circuit breaking protection device and the safety of the vehicle are easily affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a protector, power battery system and electric automobile break, aim at reducing protector's that breaks noise, improve the life of the protection device that breaks and the security of vehicle.
In order to achieve the above object, the utility model provides a circuit breaker, circuit breaker includes:
the first high-voltage interface is used for accessing a battery;
the second high-voltage interface is used for accessing a power load;
the circuit breaker is arranged between the first high-voltage interface and the second high-voltage interface in series to form a high-voltage loop;
and the arc extinguishing device is connected with the circuit breaker in parallel, and when the circuit breaker breaks the electric connection between the first high-voltage interface and the second high-voltage interface, the arc extinguishing device is electrically connected with the first high-voltage interface and the second high-voltage interface to form an arc extinguishing loop.
Optionally, the circuit breaker protector further comprises:
the circuit breaker driving interface is connected with a controlled end of the circuit breaker and used for accessing driving current;
the circuit breaker is used for disconnecting the electric connection of the first high-voltage interface and the second high-voltage interface when receiving the driving current.
Optionally, the circuit breaker protector further comprises:
the external drive interface, the warp the circuit breaker drive interface with the controlled end of circuit breaker is connected, the external drive interface is used for inserting the drive current of external drive controller output, and the warp circuit breaker drive interface output extremely the circuit breaker, in order to drive the circuit breaker disconnection the electricity of first high voltage interface and second high voltage interface is connected.
Optionally, the circuit breaker protector comprises:
an internal drive control panel, the circuit breaker drive interface with the external drive interface all set up in the internal drive control panel.
Optionally, the circuit breaker protector further comprises:
the arc striking device is arranged between the first high-voltage interface and the circuit breaker in series; and/or the arc striking device is arranged between the second high-voltage interface and the circuit breaker in series, and the arc striking device is also connected with a controlled end of the circuit breaker through the circuit breaker driving interface; wherein the content of the first and second substances,
and when the arc striking device is triggered by the short-circuit current on the high-voltage loop, the circuit breaker is driven to disconnect the electric connection of the first high-voltage interface and the second high-voltage interface.
Optionally, the arc extinguishing device is an arc extinguishing thermal fuse.
Optionally, the arc extinguishing device is an arc striking and extinguishing device, and the arc striking and extinguishing device includes:
the two arc extinguishing chambers are respectively and electrically connected with the first high-voltage interface and the second high-voltage interface;
and the arc ignition cavity is arranged between the two arc extinguishing cavities, and an electric gap is formed between the arc ignition cavities.
The utility model also provides a power battery system, reach as above including power battery the protector that opens circuit.
Optionally, the power battery system further comprises:
the battery management system is electrically connected with the power battery and the circuit breaking protector respectively; the battery management system is used for outputting a driving current to the circuit breaker of the circuit breaking protector when detecting that the power battery has a circuit breaking current, so as to drive the circuit breaker to break the electric connection of the first high-voltage interface and the second high-voltage interface.
The utility model also provides an electric automobile, which comprises the power battery system;
or alternatively, a circuit breaker as described above.
The utility model discloses circuit breaker protector when the electricity of first high pressure interface of circuit breaker disconnection and second high pressure interface is connected, come to be connected with the electricity of first high pressure interface and second high pressure interface through setting up the arc extinguishing device, in order to form the arc extinguishing return circuit, in order to restrict the inside voltage of circuit breaker, can ensure that the circuit breaker is inside not to produce harmful electric arc, can reduce the circuit breaker major loop and divide the disconnected electric arc to produce very big electric arc noise in firework circuit breaker when breaking apart, be favorable to improving circuit breaker's life and the security of vehicle.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the circuit breaker protector of the present invention;
fig. 2 is a schematic structural diagram of another embodiment of the circuit breaker of the present invention.
The reference numbers indicate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
30 | Internal |
| 11 | |
40 | Arc |
| 12 | Push rod | CN1 | First high- |
| 20 | Arc extinguishing device | CN2 | Second high- |
| 21 | Arc extinguishing thermal fuse | J1 | Circuit |
| 22 | Arc striking and extinguishing device | J2 | |
| 221、222 | Arc extinguishing chamber | J3 | |
| 223 | Arc-striking cavity |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiments of the present invention, the directional indications are only used for explaining the relative position relationship between the components, the motion situation, etc. under a certain posture (as shown in the drawings), and if the certain posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The utility model provides a circuit breaker, this circuit breaker can restrict the inside voltage of circuit breaker, and then make the inside harmful electric arc that does not produce of circuit breaker, can not influence circuit breaker's life and the security of vehicle.
Referring to fig. 1 and 2, in an embodiment of the present invention, the circuit breaker includes:
the first high-voltage interface CN1 is used for accessing a battery;
the second high-voltage interface CN2 is used for accessing a power load;
the circuit breaker 10 is arranged between the first high-voltage interface CN1 and the second high-voltage interface CN2 in series to form a high-voltage loop;
and the arc extinguishing device 20 is arranged in parallel with the circuit breaker 10, and when the circuit breaker 10 disconnects the electric connection between the first high-voltage interface CN1 and the second high-voltage interface CN2, the arc extinguishing device 20 is electrically connected with the first high-voltage interface CN1 and the second high-voltage interface CN2 to form an arc extinguishing loop.
In this embodiment, when the circuit breaker protector is applied to a new energy automobile power battery, the circuit breaker protector string may be connected in series between the battery and a power load, so as to implement short-circuit protection of the battery and/or the power load. The first high-voltage interface CN1 is used for accessing a battery, and the second high-voltage interface CN2 is used for accessing a power load, or the second high-voltage interface CN2 is used for accessing a battery, and the first high-voltage interface CN1 is used for accessing a power load. The circuit breaker 10 may also be referred to as a pyrotechnic circuit breaker 10, the circuit breaker 10 is serially disposed between the first high-voltage interface CN1 and the second high-voltage interface CN2, and when the first high-voltage interface CN1 and the second high-voltage interface CN2 are connected to a battery and a power load, respectively, a main power loop, that is, a high-voltage loop, may be formed with the battery and the power load. The circuit breaker 10 has two states of on and off, and when the circuit breaker 10 is on, the electrical connection between the battery and the power load is connected, so that the battery supplies power to the power load, and when the circuit breaker is off, the electrical connection between the battery and the power load is disconnected, so that the battery stops supplying power to the power load.
The circuit breaker 10 can also realize the circuit breaking protection when the power battery is in short circuit, an ignition bridge wire 11 and a push rod 12 are arranged inside the circuit breaker 10, when the short circuit protection is needed, the driving current accessed inside or outside is applied to the ignition bridge wire 11, the ignition bridge wire 11 triggers gunpowder, the gunpowder explosion pushes the push rod 12 to move to break a power main circuit where the firework circuit breaker 10 is located, and therefore the circuit breaking protection of the main circuit is realized. However, as the voltage level of the power battery of the new energy automobile is higher and the charging power is higher and higher, the open-circuit protection component can generate harmful electric arcs in the process of cutting off the short-circuit loop, and the broken electric arcs generate great electric arc noise in the pyrotechnic circuit breaker 10 when the main loop is broken, so that the subjective evaluation and the hearing sense of a user of the new energy automobile are influenced, the service life of the open-circuit protection component and the safety of the automobile are further influenced, and great explosion sound easily causes the worry of the user on the safety of the power battery.
For this reason, in the present embodiment, an arc extinguishing device 20 is disposed in parallel at two ends of the circuit breaker 10, that is, the arc extinguishing device 20 is also connected in series at the first high voltage interface CN1 and the second high voltage interface CN 2. The arc-extinguishing device 20 has a certain internal resistance, and the internal resistance is far greater than the circuit breaker 10, when the circuit breaker 10 is turned on, the electric energy of the battery flows to the power load through the circuit breaker 10, and at this moment, the arc-extinguishing device 20 is equivalent to being short-circuited by the circuit breaker 10. When the circuit breaker 10 is opened due to the occurrence of the short-circuit current, the arc extinguishing device 20 is electrically connected to the first high-voltage interface CN1 and the second high-voltage interface CN2, so as to form an arc extinguishing loop. The short-circuit current from the first high-voltage interface CN1 or the second high-voltage interface CN2 flows through the arc-extinguishing device 20, that is, the arc-extinguishing thermal device is disposed in parallel with the circuit breaker 10, the loop between the first high-voltage interface CN1 and the second high-voltage interface CN2 is still conductive, and the short-circuit current flows through the arc-extinguishing thermal device. Since the short-circuit current is bypassed by the quenching heat, there is no voltage inside the pyrotechnic circuit breaker 10, and no harmful arc, i.e. no arc noise, is generated inside. The arc extinguishing thermal device is fused within a certain time due to the short circuit conduction current, thereby ensuring the realization of the open circuit protection function of the main loop.
The utility model discloses circuit breaker protector is when circuit breaker 10 breaks off first high voltage interface CN1 and second high voltage interface CN 2's electricity and is connected, come to be connected with first high voltage interface CN1 and second high voltage interface CN 2's electricity through setting up arc extinguishing device 20, in order to form the arc extinguishing return circuit, in order to restrict the inside voltage of circuit breaker 10, can ensure the inside harmful electric arc that does not produce of circuit breaker 10, can reduce the circuit breaker 10 major loop and divide the disconnected electric arc to produce very big arc noise in firework circuit breaker 10 when dividing absolutely, be favorable to improving circuit breaker protector's life and the security of vehicle simultaneously.
Referring to fig. 1 or 2, in one embodiment, the circuit breaker protector further comprises:
the circuit breaker driving interface J1 is connected with the controlled end of the circuit breaker 10, and the circuit breaker driving interface J1 is used for accessing driving current;
the circuit breaker 10 is configured to disconnect the electrical connection between the first high voltage interface CN1 and the second high voltage interface CN2 when receiving a driving current.
In this embodiment, the circuit breaker driving interface J1 is used for accessing a driving current, the controlled end of the circuit breaker 10 may be two ends of the ignition bridgewire 11, when short-circuit protection is required, the driving current may be applied to the ignition bridgewire 11 through the circuit breaker driving interface J1, the ignition bridgewire 11 triggers gunpowder, and the gunpowder explosion pushes the push rod 12 to move to break a main power loop where the pyrotechnic circuit breaker 10 is located, that is, to disconnect the electrical connection between the first high-voltage interface CN1 and the second high-voltage interface CN2, thereby implementing the open-circuit protection of the main loop.
Referring to fig. 1 or 2, in one embodiment, the circuit breaker protector further comprises:
external drive interface J2, the warp circuit breaker drive interface J1 with circuit breaker 10's controlled end is connected, external drive interface J2 is used for inserting the drive current of external drive controller output, and the warp circuit breaker drive interface J1 output extremely circuit breaker 10, in order to drive circuit breaker 10 disconnection first high voltage interface CN1 and second high voltage interface CN 2's electricity is connected.
In this embodiment, the external driving interface J2 may be connected to an external driving controller, such as a battery management system BMS, the external driving interface J2 may be connected to the circuit breaker driving interface J1 through a wire, a circuit wiring, and the like, when power battery open-circuit protection is required, a driving current output by the external driving controller is applied to the ignition bridgewire 11 through the external driving interface J2 and the circuit breaker driving interface J1, powder is triggered by the ignition bridgewire 11, and the powder explosion pushes the push rod 12 to move to break a power main circuit where the pyrotechnic circuit breaker 10 is located, that is, the first high-voltage interface CN1 and the second high-voltage interface CN2 are electrically disconnected, thereby realizing open-circuit protection of the main circuit.
Referring to fig. 1 or 2, in one embodiment, the circuit breaker protector comprises:
the internal drive control board 30, the breaker drive interface J1 and the external drive interface J2 are all disposed on the internal drive control board 30.
In this embodiment, the internal drive control board 30 may be provided with circuit wiring, the pyrotechnic circuit breaker drive interface J1 of the internal drive control board 30 is connected to the ignition bridgewire 11 of the pyrotechnic circuit breaker 10 through a conductive wire, and the external drive interface J2 of the internal drive control board 30 is connected to the circuit breaker drive interface J1 through the circuit wiring provided on the internal drive control board 30. In some embodiments, the internal driving control board 30 may further include an isolation circuit, an interface conversion circuit, and the like, and the circuit breaker protector may further include a control component, such as a main controller, a communication module, a driving circuit, and the like, that can enable the circuit breaker 10 to be switched on and off intelligently.
Referring to fig. 1 or 2, in one embodiment, the circuit breaker protector further comprises:
an arc striking device 40, which is arranged in series between the first high voltage interface CN1 and the circuit breaker 10; and/or, the arc striking device 40 is arranged in series between the second high voltage interface CN2 and the circuit breaker 10, and is further connected to the controlled end of the circuit breaker 10 through the circuit breaker driving interface J1; wherein the content of the first and second substances,
when triggered by a short-circuit current on the high-voltage circuit, the arc striking device 40 drives the circuit breaker 10 to break the electrical connection between the first high-voltage interface CN1 and the second high-voltage interface CN 2.
In this embodiment, the arc striking device 40 may be an arc striking thermal fuse, the circuit breaker protector may further be provided with an internal driving interface J3, the internal driving interface J3 is wired to the pyrotechnic circuit breaker driving interface J1 through a circuit arranged on the internal driving control board 30, the internal driving interface J3 on the internal driving control board 30 is connected to two ends of the arc striking device 40 through a conductive circuit, and the circuit breaker driving interface J1 of the internal driving control board 30 is connected to the ignition bridge wire 11 of the pyrotechnic circuit breaker 10 through a conductive circuit. When power battery circuit-breaking protection is needed, the ignition bridge wire 11 of the pyrotechnic circuit breaker 10 is triggered by using the voltage generated by the arc fusing and burning of the arc-striking thermal fuse as a voltage source, specifically, when the circuit-breaking protector works normally, the internal resistance of the arc-striking thermal fuse is smaller, the voltage at two ends of the arc-striking thermal fuse is smaller at the moment, when short-circuit current flows through the arc-striking thermal fuse, the arc-striking thermal fuse is burned, when the arc is burned, voltage enough for driving the ignition bridge wire 11 to work is generated at two ends of the arc-striking thermal fuse, namely, the voltage generated by the arc fusing and burning of the arc-striking thermal fuse is used as a voltage source, driving current is provided for the ignition bridge wire 11 through the internal driving interface J3 and the circuit breaker driving interface J1, gunpowder is triggered by the ignition bridge wire 11, the push rod 12 is pushed by explosion to move to break the power main loop where the pyrotechnic circuit breaker 10 is located, namely, the electrical connection between the first high-voltage interface CN1 and the second high-voltage interface CN2 is broken, thereby realizing the open circuit protection of the main circuit.
It will be appreciated that in the above described embodiment, the battery disconnect protector is capable of providing two modes of ignition bridgewire 11 drive firing of the pyrotechnic circuit breaker 10, including an external drive mode and an internal drive mode. That is, in the battery disconnection protector, the external driving mode and the internal driving mode may be set at the same time, or only the external driving mode or the internal driving mode may be set. Wherein, the external driving mode is that the ignition bridgewire 11 of the pyrotechnic circuit breaker 10 is triggered by an external driving controller (such as a battery management system BMS) applying a driving current through an external triggering interface; the internal drive mode is triggered by the voltage generated by the burning of the arc by the blowing of the striking thermal fuse in the ignition bridge wire 11 of the pyrotechnic circuit breaker 10 as a voltage source.
When the external driving mode and the internal driving mode are set simultaneously, the external driving mode and the internal driving mode may be triggered according to the magnitude of the short-circuit current, for example, when the short-circuit current is smaller than a certain threshold, for example, 3000A, the external driving controller triggering time is shorter than the striking fuse fusing time, and the ignition bridge wire 11 is applied with the driving current by the external driving controller. When the short-circuit current is greater than or equal to a certain threshold value, for example, more than 3000A and reaches 1000A instantaneously, the striking thermal fuse can be fused instantaneously to generate a driving voltage source, the triggering time of the external driving controller is longer than the fusing time of the striking thermal fuse, and at this time, the ignition bridge wire 11 is generated by fusing of the striking thermal fuse and applies a driving current. The utility model discloses a dual circuit breaker protection can be realized to outside drive mode and inside drive mode simultaneously, is favorable to improving circuit breaker protector's reliability.
Referring to fig. 1, in one embodiment, the arc extinguishing device 20 is an arc extinguishing thermal fuse 21.
In this embodiment, when short-circuit current occurs, the ignition bridgewire 11 of the pyrotechnic circuit breaker 10 is triggered, the high-voltage loop of the pyrotechnic circuit breaker 10 is cut off, and meanwhile, the arc-extinguishing thermal fuse 21 is placed in parallel, the first high-voltage interface CN1 and the second high-voltage interface CN2 are disconnected at the circuit breaker 10, when the circuit breaking protection of the main loop is realized, the arc-extinguishing thermal fuse 21 is conducted, and the electrical connection of the first high-voltage interface CN1 and the second high-voltage interface CN2 is realized, short-circuit current flows through the arc-extinguishing thermal fuse 21 from the first high-voltage interface CN1, thereby bypassing the pyrotechnic circuit breaker 10, and the pyrotechnic circuit breaker 10 cannot gather electric arcs. Therefore, the internal part of the pyrotechnic circuit breaker 10 has no voltage, and the internal part does not generate harmful electric arcs, namely, no electric arc noise, so that the phenomenon that when the main loop of the circuit breaker 10 is broken, the broken electric arcs generate great electric arc noise in the pyrotechnic circuit breaker 10 can be reduced, and the service life of the circuit breaker protector and the safety of a vehicle can be improved. The arc-extinguishing thermal fuse 21 is fused by short-circuit conduction current in a narrow path within a certain time, thereby realizing open circuit protection. The arc extinguishing thermal fuse 21 can be a sand-filled thermal fuse, and fusing noise is low. It can be understood that the arc-extinguishing thermal fuse 21 has a larger internal resistance than the circuit breaker 10, and when the circuit breaker protector is in normal operation, the current of the battery mainly flows into the power load through the circuit breaker 10, and the arc-extinguishing thermal fuse can not participate in the conduction of the main loop, so that the problem of matching the arc-extinguishing thermal fuse with the pyrotechnic circuit breaker does not need to be considered.
Referring to fig. 2, in an embodiment, the arc extinguishing device 20 is an arc striking and extinguishing device 22, and the arc striking and extinguishing device 22 includes:
the two arc extinguishing chambers 221 and 222 are respectively and electrically connected with the first high-voltage interface CN1 and the second high-voltage interface CN 2;
and an arc ignition cavity 223 arranged between the two arc extinguishing cavities 221 and 222, wherein an electric gap is formed in the arc ignition cavity 223.
In this embodiment, compare in hybrid protection device need consider the matching of arc extinguishing hot melt and firework circuit breaker, the arc extinguishing hot melt participates in the circuit and switches on, and the arc extinguishing hot melt still need pass each item and endure the test and test from melting, and hybrid protection device is with high costs. The two ends of the main circuit of the pyrotechnic circuit breaker 10 are connected with the arc striking and extinguishing device 22 in parallel, and the arc striking and extinguishing device 22 is isolated in an arc striking cavity 223 through a very small electric gap and does not participate in circuit conduction. When short-circuit current occurs, the ignition bridgewire 11 of the pyrotechnic circuit breaker 10 is triggered, the high-voltage loop of the pyrotechnic circuit breaker 10 is cut off, and the arc striking and extinguishing device 22 is electrically connected with the first high-voltage interface CN1 and the second high-voltage interface CN2 to form an arc extinguishing loop, so that the pyrotechnic circuit breaker 10 is bypassed, and the pyrotechnic circuit breaker 10 cannot gather electric arcs. The voltage at the two ends of the parallel circuit can be gradually increased along with the disconnection process of the firework circuit breaker 10, meanwhile, the voltage at the two ends of the arc striking cavity 223 is also increased, when the voltage (arc energy) at the two ends of the arc striking cavity 223 reaches a specific value, an arc is generated in the arc striking cavity 223, at the moment, the arc striking and extinguishing device 22 serves as a conducting device of the first high-voltage interface CN1 and the second high-voltage interface CN2, short-circuit current flows through the arc striking and extinguishing device 22, intelligent insurance can be limited, namely the voltage inside the firework circuit breaker 10 is limited, further, the generation of harmful arcs inside the firework circuit breaker 10 is limited, the phenomenon that when a main circuit of the circuit breaker 10 is disconnected, the generation of arc noise in the firework circuit breaker 10 when the circuit is disconnected can be reduced, and the service life of a circuit breaker protector and the safety of a vehicle are improved. The arc-extinguishing chambers 221, 222 of the arc-striking arc-extinguishing device 22 blow due to the short-circuit conduction current, so that the arc-extinguishing circuit is cut off. Wherein, the arc extinguishing chambers 221, 222 are sand-filled thermal fuses, and the fusing noise is low.
Referring to fig. 1 and 2, in an embodiment, the circuit breaker may further include a housing, the arc extinguishing device 20, the arc striking device 40, and the internal driving control board 30 are disposed in the housing, and the first high voltage interface CN1 and the second high voltage interface CN2 are used as an input terminal and an output terminal, and are respectively connected to the battery and the power load through wires.
The utility model also provides a power battery system, reach as above including power battery the protector that opens circuit.
The detailed structure of the circuit breaker protector can refer to the above embodiments, and is not described herein again; it can be understood that, because the utility model discloses above-mentioned circuit breaker has been used among the power battery system, consequently, the utility model discloses power battery system's embodiment includes the whole technical scheme of the whole embodiments of above-mentioned circuit breaker, and the technical effect that reaches is also identical, no longer gives details here.
Referring to fig. 1 or 2, in an embodiment, the power cell system further comprises:
a battery management system (not shown) electrically connected to the power battery and the circuit breaker, respectively; the battery management system is used for outputting a driving current to the circuit breaker 10 of the circuit breaker protector when detecting that the power battery has a circuit breaking current, so as to drive the circuit breaker 10 to break the electrical connection between the first high-voltage interface CN1 and the second high-voltage interface CN 2.
In this embodiment, the battery management system may collect the current of the high-voltage loop, when the current of the high-voltage loop reaches the short-circuit current threshold, the output driving current is applied to the ignition bridgewire 11 of the circuit breaker 10 in the circuit breaker through the external driving interface J2 and the circuit breaker driving interface J1 of the circuit breaker, the ignition bridgewire 11 triggers the powder, the powder explosion pushes the push rod 12 to move to break the power main loop where the pyrotechnic circuit breaker 10 is located, that is, the first high-voltage interface CN1 and the second high-voltage interface CN2 are electrically disconnected, so as to realize the circuit-breaking protection of the main loop. The battery management system may set different short-circuit current intervals, and set different trigger delay times (short-circuit current durations) according to the short-circuit interval matched with the short-circuit current, for example, 1000A < short-circuit current < 3000A, and the delay time may be set to 50 ms. When the short circuit occurs in the main loop, the circuit breaker 10 is driven to break off the main loop, so that the service life of the circuit breaker protector is prolonged, and the safety of a vehicle is improved.
When the battery management system of the embodiment can respectively form an external driving mode and an internal driving mode with arc striking thermal fuses in the circuit breaker, the external driving mode and the internal driving mode can be triggered according to the size of short-circuit current, double circuit breaker protection can be realized, and the reliability of the circuit breaker is favorably improved.
The utility model also provides an electric automobile, which comprises the power battery system;
or alternatively, a circuit breaker as described above.
The detailed structure of the circuit breaker protector and the power battery system can refer to the above embodiments, and the detailed description is omitted; it can be understood, because the utility model discloses used above-mentioned circuit breaker power battery system among the electric automobile, consequently, the utility model discloses electric automobile's embodiment includes above-mentioned circuit breaker and all technical scheme of the whole embodiments of power battery system, and the technical effect who reaches is also identical, no longer gives unnecessary details here.
The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (10)
1. A circuit breaker protector, characterized in that it comprises:
the first high-voltage interface is used for accessing a battery;
the second high-voltage interface is used for accessing a power load;
the circuit breaker is arranged between the first high-voltage interface and the second high-voltage interface in series to form a high-voltage loop;
the arc extinguishing device is connected with the circuit breaker in parallel, and when the circuit breaker breaks the electric connection between the first high-voltage interface and the second high-voltage interface, the arc extinguishing device is electrically connected with the first high-voltage interface and the second high-voltage interface to form an arc extinguishing loop.
2. The circuit breaker of claim 1 wherein the circuit breaker further comprises:
the circuit breaker driving interface is connected with a controlled end of the circuit breaker and used for accessing driving current;
the circuit breaker is used for disconnecting the electric connection of the first high-voltage interface and the second high-voltage interface when receiving the driving current.
3. The circuit breaker of claim 2 wherein the circuit breaker further comprises:
the external drive interface, the warp the circuit breaker drive interface with the controlled end of circuit breaker is connected, the external drive interface is used for inserting the drive current of external drive controller output, and the warp circuit breaker drive interface output extremely the circuit breaker, in order to drive the circuit breaker disconnection the electricity of first high voltage interface and second high voltage interface is connected.
4. The circuit breaker of claim 3 wherein the circuit breaker comprises:
an internal drive control panel, the circuit breaker drive interface with the external drive interface all set up in the internal drive control panel.
5. The circuit breaker of claim 2 wherein the circuit breaker further comprises:
the arc striking device is arranged between the first high-voltage interface and the circuit breaker in series; and/or the arc striking device is arranged between the second high-voltage interface and the circuit breaker in series, and the arc striking device is also connected with a controlled end of the circuit breaker through the circuit breaker driving interface; wherein the content of the first and second substances,
and when the arc striking device is triggered by the short-circuit current on the high-voltage loop, the circuit breaker is driven to disconnect the electric connection of the first high-voltage interface and the second high-voltage interface.
6. A circuit break protector according to any of the claims 1-5 characterized in that the arc extinguishing device is an arc extinguishing thermal fuse.
7. The circuit breaker of any one of claims 1-5 wherein the arc quenching device is an arc initiating and quenching device, the arc initiating and quenching device comprising:
the two arc extinguishing chambers are respectively and electrically connected with the first high-voltage interface and the second high-voltage interface;
and the arc ignition cavity is arranged between the two arc extinguishing cavities, and an electric gap is formed between the arc ignition cavities.
8. A power battery system comprising a power battery and a circuit breaker according to any one of claims 1 to 7.
9. The power cell system of claim 8, further comprising:
the battery management system is electrically connected with the power battery and the circuit breaking protector respectively; the battery management system is used for outputting a driving current to the circuit breaker of the circuit breaking protector when detecting that the power battery has a circuit breaking current, so as to drive the circuit breaker to break the electric connection of the first high-voltage interface and the second high-voltage interface.
10. An electric vehicle, characterized in that it comprises a power battery system according to claim 8 or 9;
or, alternatively, a circuit-breaking protector according to any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221436267.1U CN217386938U (en) | 2022-06-09 | 2022-06-09 | Circuit breaker, power battery system and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221436267.1U CN217386938U (en) | 2022-06-09 | 2022-06-09 | Circuit breaker, power battery system and electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217386938U true CN217386938U (en) | 2022-09-06 |
Family
ID=83090966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221436267.1U Active CN217386938U (en) | 2022-06-09 | 2022-06-09 | Circuit breaker, power battery system and electric automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217386938U (en) |
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2022
- 2022-06-09 CN CN202221436267.1U patent/CN217386938U/en active Active
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Effective date of registration: 20231130 Address after: Room 482, room 406, No. 1, Yichuang street, Zhongxin Guangzhou Knowledge City, Huangpu District, Guangzhou 510000, Guangdong Province Patentee after: Guangzhou Zhipeng Manufacturing Co.,Ltd. Address before: 510000 No.8 Songgang street, Cencun, Tianhe District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU XIAOPENG MOTORS TECHNOLOGY Co.,Ltd. |