EP3172756B1 - Primary electric circuit interrupting device, in particular for electric vehicles - Google Patents

Primary electric circuit interrupting device, in particular for electric vehicles Download PDF

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Publication number
EP3172756B1
EP3172756B1 EP14835724.7A EP14835724A EP3172756B1 EP 3172756 B1 EP3172756 B1 EP 3172756B1 EP 14835724 A EP14835724 A EP 14835724A EP 3172756 B1 EP3172756 B1 EP 3172756B1
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EP
European Patent Office
Prior art keywords
electric
driving unit
primary
energy source
melting member
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14835724.7A
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German (de)
French (fr)
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EP3172756A1 (en
Inventor
Mitja Koprivsek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Razvojni Center Enem Novi Materiali doo
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Razvojni Center Enem Novi Materiali doo
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Publication of EP3172756A1 publication Critical patent/EP3172756A1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/048—Fuse resistors
    • H01H2085/0486—Fuse resistors with voltage dependent resistor, e.g. varistor

Definitions

  • the present invention refers to a device for interrupting a primary electric circuit in an electrically driven vehicle, in particular in vehicle crash situation, namely of a circuit between each electric driving unit and each electric energy source.
  • the purpose of the invention is to create a primary electric circuit interrupting device, in particular for electric vehicles and especially a crash-activated one, namely for interruption of a circuit between each electric driving unit and each electric energy source for energizing said electric driving unit, wherein such device should without any undesired effect, in particular without forming electric arc, flame, smoke or explosion, enable total interruption of each electric interconnection between each electric driving unit and each disposable electric energy source for energizing said electric driving unit including any other electric components, which are connected to each conductor for connecting of said electric driving unit with said electric energy source, and simultaneously, when said electric energy source is a battery, the device should also contribute to intensive discharging of said battery.
  • a fuse with a melting member which is capable to interrupt an electric circuit extending there-through, is disclosed in a published international application WO 2014/065763 .
  • Such fuse comprises a body, which consists of electric insulating material and by which each disposable melting member is surrounded, which is adjusted to each nominal electric current value and is electrically connected with each disposable electric contacts, which are arranged on the external surface of said fuse body and by means of which the fuse can be integrated into each primary electric circuit, which is then protected by means of said fuse.
  • such fuse comprises a resistor, in particular a voltage-dependent resistor, namely a varistor, the resistance of which is reciprocally correlated with voltage to which it is exposed, wherein said resistor is arranged adjacent to said melting member and therefore in a heat-conductive relationship with said melting member.
  • Said resistor is electrically connected into a secondary electric circuit by means of least one switch, which can be activated, when desired, independently on conditions in the primary circuit.
  • Such solution is generally suitable for interruption of a primary electric circuit in an electrically driven vehicle in a vehicle crash situation. Whenever said resistor is a classic resistor, electric arc is generated by closing said switch and establishing said secondary electric circuit.
  • resistor is a varistor
  • such fuse is capable to interrupt only one of both conductors between each electric energy source and each electric driving unit, while the other conductor together with any other electric components connected thereto remains in electric contact both with the electric energy source and the electric driving unit as well.
  • a primary electric circuit interrupting device is also mentioned in EP 0 227 407 A2 .
  • the present invention refers to a primary electric circuit interrupting device, in particular for electric vehicles and especially a crash-activated one, wherein such device is suitable for integration between each electric driving unit and each electric energy source for energizing said electric driving unit, and wherein said electric driving unit and said electric energy source are via two electric conductors connected with each other into a primary electric circuit, and wherein said device is furnished with at least one fuse comprising an integrated melting member and a varistor which is intended for emergency interruption of said melting member.
  • the previously mentioned problem is solved in such manner that in each of said electric conductors of the primary electric circuit, which are intended to connect each driving unit with each electric energy source, a fuse with a melting member and a varistor is integrated, so that said driving unit and said electric energy source are interconnected via the melting members of said fuses.
  • the varistor in each of said fuses is arranged in a heat-conductive relationship with each belonging melting member, and simultaneously, each of said varistors is electrically interconnected with a switch, which is adapted for establishing or interruption of electric contact between said varistors of both fuses.
  • Each of said varistors is preferably soldered to each belonging melting member in the fuse, and said switch is preferably an autonomously energized electromagnetic switch.
  • Fig. 1 is a schematically presented especially crash-activated primary electric circuit interrupting device, in particular for electric vehicles.
  • An especially crash-activated primary electric circuit interrupting device in particular for electric vehicles, which is shown in Fig. 1 , is suitable for integration between each electric driving unit 1 and each electric energy source 2 in a vehicle.
  • Said electric energy source 2 in electric vehicles is usually an accumulator i.e. a battery functioning as a high-voltage DC source, whilst said driving unit 1 is a suitable electric motor.
  • the driving unit 1 and the electric energy source 2 are via two electric conductors 21, 22 electrically connectable with each other into a primary electric circuit.
  • each of said electric conductors 21, 22 is furnished with a fuse 3', 3" with a melting member 31', 31" and a varistor 32', 32", so that in each of said electric conductors 21, 22 the electric driving unit 1 is connected with each electric energy source 2 via the melting member 31', 31" of each fuse 3', 3".
  • said melting member 31', 31" is molten, by which said primary electric circuit is interrupted.
  • Each of said varistors 32', 32" is intended for emergency interruption of said circuit in the area of each belonging melting member 31', 32" eventhough the electric current in the melting member 31', 31" is lower than a pre-determined value, which would lead to melting of each melting member 31', 31" due to excessive current.
  • Each varistor 32', 32" is an electric resistor, the electric resistance of which is reciprocally correlated with electric voltage.
  • each varistor 32', 32" in each of said fuses 3', 3" is arranged both in electric contact and heat-conductive contact with each belonging melting member 31', 31".
  • said varistor 32', 32" is simply soldered to the melting member 31', 31" of each fuse 3', 3".
  • each of said varistors 32', 32" is electrically connected with a switch 4, which is suitable for establishing or interruption of electric contact between both varistors 32', 32" of said fuses 3', 3".
  • Said switch 4 is preferably an electromagnetic switch, which is energized autonomously, e.g. by 12 V voltage.
  • said switch 4 is deactivated, and the primary electric circuit between the driving unit 1 and each electric energy source 2 is established via said electric conductors with integrated fuses 3', 3" with melting members 31', 31".

Landscapes

  • Fuses (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Emergency Protection Circuit Devices (AREA)

Description

  • The present invention refers to a device for interrupting a primary electric circuit in an electrically driven vehicle, in particular in vehicle crash situation, namely of a circuit between each electric driving unit and each electric energy source.
  • The purpose of the invention is to create a primary electric circuit interrupting device, in particular for electric vehicles and especially a crash-activated one, namely for interruption of a circuit between each electric driving unit and each electric energy source for energizing said electric driving unit, wherein such device should without any undesired effect, in particular without forming electric arc, flame, smoke or explosion, enable total interruption of each electric interconnection between each electric driving unit and each disposable electric energy source for energizing said electric driving unit including any other electric components, which are connected to each conductor for connecting of said electric driving unit with said electric energy source, and simultaneously, when said electric energy source is a battery, the device should also contribute to intensive discharging of said battery.
  • A fuse with a melting member, which is capable to interrupt an electric circuit extending there-through, is disclosed in a published international application WO 2014/065763 . Such fuse comprises a body, which consists of electric insulating material and by which each disposable melting member is surrounded, which is adjusted to each nominal electric current value and is electrically connected with each disposable electric contacts, which are arranged on the external surface of said fuse body and by means of which the fuse can be integrated into each primary electric circuit, which is then protected by means of said fuse. Moreover, such fuse comprises a resistor, in particular a voltage-dependent resistor, namely a varistor, the resistance of which is reciprocally correlated with voltage to which it is exposed, wherein said resistor is arranged adjacent to said melting member and therefore in a heat-conductive relationship with said melting member. Said resistor is electrically connected into a secondary electric circuit by means of least one switch, which can be activated, when desired, independently on conditions in the primary circuit. Such solution is generally suitable for interruption of a primary electric circuit in an electrically driven vehicle in a vehicle crash situation. Whenever said resistor is a classic resistor, electric arc is generated by closing said switch and establishing said secondary electric circuit. Whenever said resistor is a varistor, then such fuse is capable to interrupt only one of both conductors between each electric energy source and each electric driving unit, while the other conductor together with any other electric components connected thereto remains in electric contact both with the electric energy source and the electric driving unit as well.
  • A primary electric circuit interrupting device is also mentioned in EP 0 227 407 A2 .
  • The present invention refers to a primary electric circuit interrupting device, in particular for electric vehicles and especially a crash-activated one, wherein such device is suitable for integration between each electric driving unit and each electric energy source for energizing said electric driving unit, and wherein said electric driving unit and said electric energy source are via two electric conductors connected with each other into a primary electric circuit, and wherein said device is furnished with at least one fuse comprising an integrated melting member and a varistor which is intended for emergency interruption of said melting member.
  • According to the invention, the previously mentioned problem is solved in such manner that in each of said electric conductors of the primary electric circuit, which are intended to connect each driving unit with each electric energy source, a fuse with a melting member and a varistor is integrated, so that said driving unit and said electric energy source are interconnected via the melting members of said fuses. In this, the varistor in each of said fuses is arranged in a heat-conductive relationship with each belonging melting member, and simultaneously, each of said varistors is electrically interconnected with a switch, which is adapted for establishing or interruption of electric contact between said varistors of both fuses.
  • Each of said varistors is preferably soldered to each belonging melting member in the fuse, and said switch is preferably an autonomously energized electromagnetic switch.
  • The invention will be described on the basis of an embodiment, which is shown in the attached drawing, wherein Fig. 1 is a schematically presented especially crash-activated primary electric circuit interrupting device, in particular for electric vehicles.
  • An especially crash-activated primary electric circuit interrupting device, in particular for electric vehicles, which is shown in Fig. 1, is suitable for integration between each electric driving unit 1 and each electric energy source 2 in a vehicle.
  • Said electric energy source 2 in electric vehicles is usually an accumulator i.e. a battery functioning as a high-voltage DC source, whilst said driving unit 1 is a suitable electric motor.
  • The driving unit 1 and the electric energy source 2 are via two electric conductors 21, 22 electrically connectable with each other into a primary electric circuit.
  • In accordance with the present invention, each of said electric conductors 21, 22 is furnished with a fuse 3', 3" with a melting member 31', 31" and a varistor 32', 32", so that in each of said electric conductors 21, 22 the electric driving unit 1 is connected with each electric energy source 2 via the melting member 31', 31" of each fuse 3', 3". Whenever an electric overload i.e. excessive current occurs, said melting member 31', 31" is molten, by which said primary electric circuit is interrupted. Each of said varistors 32', 32" is intended for emergency interruption of said circuit in the area of each belonging melting member 31', 32" eventhough the electric current in the melting member 31', 31" is lower than a pre-determined value, which would lead to melting of each melting member 31', 31" due to excessive current.
  • Each varistor 32', 32" is an electric resistor, the electric resistance of which is reciprocally correlated with electric voltage.
  • The invention provides that each varistor 32', 32" in each of said fuses 3', 3" is arranged both in electric contact and heat-conductive contact with each belonging melting member 31', 31". Most preferred, said varistor 32', 32" is simply soldered to the melting member 31', 31" of each fuse 3', 3".
  • At the same time, each of said varistors 32', 32" is electrically connected with a switch 4, which is suitable for establishing or interruption of electric contact between both varistors 32', 32" of said fuses 3', 3". Said switch 4 is preferably an electromagnetic switch, which is energized autonomously, e.g. by 12 V voltage.
  • As shown in Fig. 1, said switch 4 is deactivated, and the primary electric circuit between the driving unit 1 and each electric energy source 2 is established via said electric conductors with integrated fuses 3', 3" with melting members 31', 31".
  • As soon as the switch 4 is activated, in particular e.g. in the case of a vehicle crash, electric interconnection is established between both varistors 32', 32" in said fuses 3', 3", which leads to formation of a secondary electric circuit through said electric energy source 2, said electric conductors 21, 22, said melting members 31', 31" and said varistors 32', 32" in both fuses 3', 3". When said secondary electric circuit is established, the current through both varistors 32', 32" is due to appropriate characteristic thereof relatively low, by which formation of electric arc or sparks or any other undesired effects is efficiently avoided. After that, the current through said varistors 32', 32" is gradually increased, by which the varistors 32', 32" are intensively heated, which leads to melting of said melting member 31', 31" and interruption of each corresponding electric conductor 21, 22, by which the driving unit 1 together with any other electric components integrated in each of said electric conductors 21, 22 are disconnected from the electric energy source 2.

Claims (2)

  1. A primary electric circuit interrupting device, in particular for electric vehicles and especially a crash-activated one, which is suitable for integration between an electric driving unit (1) and an electric energy source (2) for energizing said electric driving unit (1), the primary electric circuit interrupting device comprising two conductors (21, 22), wherein said electric driving unit (1) and said electric energy source (2) are able to be connected via said two electric conductors (21, 22) with each other into a primary electric circuit, and wherein said device is furnished with at least one fuse (3', 3") comprising an integrated melting member (31', 31") and a varistor (32', 32") which is intended for emergency interruption of said melting member (31', 31"), characterized in that in each of both electric conductors (21, 22) of the primary electric circuit a fuse (3', 3 ") with a melting member (31', 31") and a varistor (32', 32") is integrated, so that said driving unit (1) and said electric energy source (2) are able to be interconnected via the melting members (31', 31") of both fuses (3', 3"), and the varistor (32', 32") in each of said fuses (3', 3") is arranged in a heat-conductive relationship with each belonging melting member (31', 31"), and simultaneously each of said varistors (32', 32") is electrically interconnected with a switch (4), which is adapted for establishing or interrupting of electric contact between the varistors (32', 32") in both fuses (3', 3") and which is an autonomously energized electromagnetic switch.
  2. Device according to Claim 1, characterized in that each of said varistors (32', 32") is soldered to each belonging melting member (31', 31") in each fuse (3',3").
EP14835724.7A 2014-07-21 2014-12-05 Primary electric circuit interrupting device, in particular for electric vehicles Active EP3172756B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SI201400266A SI24775B (en) 2014-07-21 2014-07-21 The device for the interruption of the primary electrical circuit in the electric vehicle, particularly in the event of a collision of the vehicle
PCT/SI2014/000073 WO2016013988A1 (en) 2014-07-21 2014-12-05 Primary electric circuit interrupting device, in particular for electric vehicles

Publications (2)

Publication Number Publication Date
EP3172756A1 EP3172756A1 (en) 2017-05-31
EP3172756B1 true EP3172756B1 (en) 2020-08-26

Family

ID=52469269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14835724.7A Active EP3172756B1 (en) 2014-07-21 2014-12-05 Primary electric circuit interrupting device, in particular for electric vehicles

Country Status (3)

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EP (1) EP3172756B1 (en)
SI (1) SI24775B (en)
WO (1) WO2016013988A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SI25462A (en) 2018-02-23 2018-12-31 Tušek Aljoša Front axle drive unit for vehicles using an electric motor with an external rotor
SI25837B (en) * 2019-04-25 2023-06-30 Eti Elektroelement, D.O.O. Switchgear for interrupting a direct current electrical circuit
FR3113765B1 (en) * 2020-08-26 2023-05-26 Mersen France Sb Sas Apparatus for interrupting an electric current

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4698736A (en) * 1985-12-16 1987-10-06 Kabushiki Kaisha Toshiba Protection circuit for a power converter apparatus
DE19851311B4 (en) * 1998-11-06 2004-10-28 1St Memory Alloys Gmbh Electrical break protection with memory insert and suitable memory alloys
WO2007110850A1 (en) * 2006-03-28 2007-10-04 Littelfuse Ireland Limited Transient voltage surge suppression
PL2912675T3 (en) 2012-10-25 2018-07-31 Razvojni Center Enem Novi Materiali D.O.O. Fuse with at least one melting member

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
SI24775B (en) 2020-11-30
SI24775A (en) 2016-01-29
EP3172756A1 (en) 2017-05-31
WO2016013988A1 (en) 2016-01-28

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