KR20170000325U - Integrated pre-charge relay for battery disconnect unit of electric vehicle - Google Patents

Abstract

The present invention discloses an integral precharge relay. More particularly, the present invention relates to an integrated precharge relay provided in a battery disconnect unit provided in an electric vehicle and serving as a switching circuit unit capable of switching to a state of supplying power or an interruption state.
According to the embodiment of the present invention, by integrating the integrated precharge relay and the precharge resistor into one element, it is possible to further secure a space on the frame of the battery disconnect unit, to reduce the assembly process of the battery disconnect unit, Can be simplified.

Description

[0001] INTEGRATED PRE-CHARGE RELAY FOR BATTERY DISCONNECT UNIT OF ELECTRIC VEHICLE [0002]

The present invention relates to an integrated precharge relay, and more particularly, to an integrated precharge relay provided in a battery disconnect unit provided in an electric vehicle and serving as a switching circuit part capable of switching to a state of supplying power or an interruption state.

An electric vehicle is an automobile that is operated by electricity. The electric vehicle can be classified into a pure electric vehicle (Batttery Powered Electric Vehicle) and a hybrid electric vehicle (Hybrid Electric Vehicle). Here, a pure electric vehicle refers to a vehicle that uses electricity only, and a hybrid electric vehicle refers to a vehicle that uses electricity and fossil fuel together.

In such an electric vehicle, a battery for supplying electricity for running, a motor driven by electric energy supplied from the battery, a battery disconnection unit (BDU) and an inverter are provided between the battery and the motor do. Here, the battery disconnecting unit serves to stably supply or shut off the battery power to a driving device such as a motor.

1 is a perspective view of a battery disconnect unit for a conventional electric vehicle.

 Referring to FIG. 1, a conventional battery disconnect unit for an electric vehicle includes a frame 10, a main relay 20, a pre-charge relay 30, a pre-charge resistor Pre -charge resistor 40, and the like.

In the frame 10, various elements constituting the battery disconnect unit are mounted. Sockets to be connected to the external system are disposed at the ends, and elements such as the relays 20 and 30 are disposed at the center.

The main relay 20 serves to supply or cut off power between the battery and the motor. The precharge relay 30 and the precharge resistor 40 prevent the main relay 20 from being damaged by current input. Normally, two main relays 20 are provided.

In particular, since the pre-charge resistor 40 is arranged in line with the pre-charge relay 30 in the circuit configuration, the pre-charge relay 40 can reduce the excessive current input to the pre- And they are electrically connected to each other through a bus bar connected to one another.

FIG. 2 is a diagram showing a connection structure of a precharge relay and a precharge resistor of the battery disconnect unit of FIG. 1;

Referring to FIG. 2, the precharge relay 30 has a lower electrode disposed thereon. One electrode of the precharge relay 30, which is not a dual switching electrode, receives a current is connected to a precharging resistor 40, So that it is electrically connected to one electrode of the electrode.

According to this structure, in the conventional battery disconnect unit, not only the area where the precharge relay 30 and the precharging resistor 40 are mounted on the frame must be ensured, but the bus bar 50 must be disposed below the frame . Therefore, the assembling time of the unit is delayed, and it is difficult to secure an area for arranging each component on a frame of limited space.

The present invention has been conceived to solve the above-described problems. The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to reduce the number of pre-charge relays and resistors, which are circuit elements included in a battery disconnect unit of an electric vehicle, And to simplify the structure of the battery disconnect unit.

In order to achieve the above object, an integrated precharge relay according to an embodiment of the present invention includes a case in which a switching circuit is mounted and a first to third electrodes are exposed on a lower surface, And a resistance element in which the first terminal is connected to the first electrode and the second terminal is connected to the input terminal of the switching circuit.

In the present invention, the second electrode is connected to the output terminal of the switching circuit, and the third electrode is connected to the gate terminal of the switching circuit.

The first to third electrodes are assembled on different bus bars.

In the integrated precharge relay according to the embodiment of the present invention, since the existing precharge relay and the precharge resistor are integrated into one device, a space on the frame of the battery disconnect unit can be further secured, It is possible to reduce the number of processes and simplify the structure.

1 is a perspective view of a battery disconnect unit for a conventional electric vehicle.
FIG. 2 is a diagram showing a connection structure of a precharge relay and a precharge resistor of the battery disconnect unit of FIG. 1;
3 is an equivalent circuit diagram of a battery disconnect unit including an integrated precharge relay according to an embodiment of the present invention.
4 is a view showing a structure of an integral precharge relay according to an embodiment of the present invention.

In this specification, terms including ordinal numbers such as first, second, etc. are used to denote various elements, and the constituent elements are not limited by such terms. The terms described in the following description are used for the purpose of distinguishing one element from another.

In particular, where an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may be present in between. On the other hand, if any component is described as having a "direct connection" or "direct connection" to another component, there is no other component in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the inventive concept, but the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

Hereinafter, a battery disconnect unit including an integrated precharge relay according to a preferred embodiment of the present invention will be described with reference to the drawings.

3 is an equivalent circuit diagram of a battery disconnect unit including an integrated precharge relay according to an embodiment of the present invention.

3, a battery disconnect unit 100 including an integrated precharge relay according to an embodiment of the present invention includes a control unit 110, first and second main relays 121 and 122, A DC / DC connector 140 connected to the battery, a positive high voltage terminal and a minus high voltage terminal 151 and 152 connected to the charger, and an inverter connected to the inverter Voltage high-voltage connector and negative high-voltage connector 161, 162, respectively.

Also, although not shown, each component of the battery disconnect unit 100 may be electrically connected to each other by one or more bus bars (not shown) assembled on the frame.

The control unit 110 controls the switch operation of the first and second main relays 121 and 122 and the integrated precharge relay 130. The control unit 110 may be configured such that the battery disconnect unit 100 of the present invention is applied Receives a control signal from an external system such as a vehicle or a generator, and controls the connection between the battery or the generator and the inverter in response to the control signal.

The first and second main relays 121 and 122 are provided between the battery and the generator and connected to the inverter when the power of the external system is turned on in response to the control signal, When the power is turned off, the battery is disconnected from the inverter and the battery power is supplied to the inverter. The first and second main relays 121 and 122 may correspond to positive and negative voltages, respectively.

The integrated precharge relay 130 is connected between the battery and the generator and the inverter similar to the first and second main relays 121 and 122. When the first and second main relays 121 and 122 are switched from the connected state to the disconnected state, the integrated pre-charge relay 130 is connected and the charging of the capacitor (not shown) connected thereto is started, When the capacitor is sufficiently charged, the first and second main relays are connected and the integral precharge relay 130 is shut off. Accordingly, large power is rapidly applied to prevent the electrodes of the first and second main relays 121 and 122 from being damaged or welded.

Particularly, the integrated precharge relay 130 according to the embodiment of the present invention includes a precharge resistor R that functions to lower an excessive current inputted at the initial stage of driving in addition to the switching unit. The first electrode of the precharge resistor R is exposed to the outside and connected to a bus bar (not shown), and the second electrode is connected to one terminal of the switching unit to form a single device.

Meanwhile, the bus bar may have a thin plate shape and may be made of a conductive metal such as copper or aluminum. These are used for electrically connecting the respective elements to be described later. Since they have higher rigidity than lead wires that are typically used for electrical connection, they maintain their shape unless a strong external force is applied. .

The DC / DC connector 140 is for connecting the battery disconnect unit 100 and an external battery. The DC / DC connector 140 includes a plus terminal and a minus terminal and a first main relay 121 and a second main relay 122, Lt; / RTI > In this case, a fuse (F) for preventing circuit breakage can be connected to the wiring connected to the positive terminal.

The positive high voltage terminal and the negative high voltage terminal 151 and 152 are for connecting the battery disconnect unit 100 and the generator of the external system and include a plus terminal and a minus terminal and a first main relay 121 and a second main relay 121. [ (122) are electrically connected to each other.

The positive high voltage connector and the negative high voltage connector 161 and 162 serve to connect the battery relay unit 100 and an external inverter. The inverter serves to convert the power input through the first and second main relays 121 and 122 into an AC waveform, and in the case of a vehicle, it is connected to a motor. Each of the high voltage connectors 161 and 162 is mechanically connected to the inverter to deliver positive high voltage and negative high voltage to the inverter.

Between the first main relay 121 and the positive high voltage connector 161, a current sensor 170 for sensing the current flowing to the inverter may be provided. The current sensor 170 measures the current applied from the battery to determine whether there is an abnormality in the battery disconnect unit 100, and the measured current value can be transmitted to the external system.

Hereinafter, an integrated precharge relay for a battery disconnect unit according to an embodiment of the present invention will be described with reference to the drawings.

4 is a view showing a structure of an integral precharge relay according to an embodiment of the present invention.

4, the integrated precharge relay 130 of the present invention includes a resistance element R, a case 131 in which a switching circuit and a resistance element R are mounted, an output of the resistance element and the switching circuit First and second electrodes 132 and 133 electrically connected to the terminal, and a third electrode 135 electrically connected to the gate terminal of the switching circuit.

The case 131 constitutes an appearance of the integrated pre-charge relay 130, and protects the internal switching circuit and the resistance element R, so that the internal circuit has a package form. The size can be made to be the same as that of the conventional precharge relay (30 in FIG. 2), but can be adjusted within a size that can be assembled on the frame of the battery disconnect unit in consideration of the size of the built- .

On the lower surface of the case 131, terminals extending from the internal circuit are exposed in the form of an electrode.

The resistance element R corresponds to the conventional pre-charge resistance (40 in FIG. 2), and its size is adjusted so as to conform to the standard of the case 131, and the case 131 ).

One terminal 137 of the two terminals of the resistance element R is connected to the first electrode 132 protruding from the lower surface of the case 131 and the remaining terminal 138 is connected to the internal switching circuit Respectively.

The first electrode 132 of the integrated precharge relay 130 is connected to the terminal 137 of the resistance element R and protrudes outside the case 131 to be connected to a bus bar Assembled. In addition, the second electrode 133 is internally connected to the output terminal of the switching circuit, and is assembled to the bus bar externally.

The third electrode 135 receives the control signal of the integrated precharge relay 130 and is connected to the gate of the switching circuit. The third electrode 135 is connected to the case 131 separately from the first and second electrodes 132 and 133. As shown in FIG. Which is coupled to a bus bar different from the other electrode.

According to such a structure, the integrated precharge relay according to the embodiment of the present invention can be mounted in a limited space of the battery disconnect unit, since a separate precharge resistor is not required, and the structure and assembly process can be simplified There is an effect that can be.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the present invention can be changed.

130: Integrated precharge relay 131: Case
132: first electrode 133: second electrode
135: third electrode 137: first terminal (of the resistive element)
138: second terminal (of the resistance element) R:

Claims (3)

An integrated precharge relay of a battery disconnect unit for an electric vehicle,
A case in which a switching circuit is mounted inside and a first to third electrodes are exposed on a lower surface; And
Wherein the first terminal is connected to the first electrode and the second terminal is connected to the input terminal of the switching circuit,
Lt; RTI ID = 0.0 > precharge < / RTI > relay. The method according to claim 1,
The second electrode is connected to an output terminal of the switching circuit,
And the third electrode is connected to a gate terminal of the switching circuit. The method according to claim 1,
The first, second,
Wherein the precharging relays are assembled on different bus bars.

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