JP4650453B2 - High voltage equipment module - Google Patents

Description

  The present invention relates to a high voltage device module in which an electromagnetic relay incorporated in a part of a high voltage circuit is attached to a casing.

  For example, a hybrid vehicle or the like is equipped with a battery as a DC high-voltage power supply and a power converter for driving and controlling a motor by converting DC power of the battery into AC power. And the battery and the power converter are connected via the high voltage apparatus module which has an electromagnetic relay etc. Thus, for example, when an abnormality occurs in the power conversion device, the battery and the power conversion device are electrically disconnected to prevent the overcurrent from continuing to flow into the high voltage circuit, or from the battery to the power conversion device at startup. This prevents a large current from rushing in.

For example, as shown in FIG. 7, the high-voltage device module 9 includes an electromagnetic relay 92, a high-voltage bus bar 93 that forms a part of the high-voltage circuit, and a low voltage through which a low-voltage current for driving the electromagnetic relay 92 flows. A bus bar 94 is mounted on a housing 95.
And each terminal 921 of the electromagnetic relay 92 is inserted by the connector 931,941 provided in the high voltage bus bar 93 and the low voltage bus bar 94, respectively (refer patent document 1). Thereby, the electromagnetic relay 92 can be attached to and detached from the high voltage bus bar 93 and the low voltage bus bar 94.
The high-voltage device module 9 is also provided with electronic components such as a register 96, and the terminal 961 is also inserted into the connection connector 931 of the high-voltage bus bar 93.

Further, in the conventional high voltage device module 9, the high voltage bus bar 93 and the low voltage bus bar 94 are both concentrated on the surface of the housing 95 opposite to the side where the main body 920 of the electromagnetic relay 92 is disposed. (Refer to patent document 2). This is because such a configuration is efficient in order to connect the high voltage bus bar 93 and the low voltage bus bar 94 with the connection connectors 931 and 941.
FIG. 7 shows a state before the high-voltage bus bar 93 and the low-voltage bus bar 94 are assembled to the housing 95. The high-voltage bus bar 93 and the low-voltage bus bar 94 are mounted in the direction of arrow C in FIG. The high voltage device module 9 is obtained by assembling to the body 95 and fitting the connection connectors 931 and 941 with the terminals 921 and 961 of the electromagnetic relay 92 and the resistor 96.

However, when the high-voltage bus bar 93 and the low-voltage bus bar 94 are concentratedly arranged on the same surface side of the housing 95, the housing 95 is inevitably increased in size when securing these insulations and wiring. Is done. In addition, if the high voltage bus bar 93 and the low voltage bus bar 94 are arranged so as not to cross each other, the arrangement of the input terminals and output terminals of the high voltage bus bar 93 and the low voltage bus bar 94 is limited.
As described above, when the high voltage bus bar 93 and the low voltage bus bar 94 are concentrated on the same surface side of the housing 95, the degree of freedom in design is greatly limited and the high voltage device module 9 can be downsized. It becomes difficult.

  Further, as described above, when the connection 921 and the low voltage bus bar 94 are connected to the terminal 921 of the electromagnetic relay 92 by the connection connectors 931 and 941, contact resistance is generated in these connection portions. In particular, there is a problem that heat generation becomes large at the connection portion with the high voltage bus bar 93.

JP 2006-40704 A JP 2001-28822 A

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a high-voltage device module that has a high degree of freedom in wiring, can be easily miniaturized, and generates little heat.

The first invention is an electromagnetic relay incorporated in a part of a high voltage circuit, a high voltage bus bar constituting a part of the high voltage circuit, and a low voltage through which a low voltage current for driving the electromagnetic relay flows. A high-voltage device module having a bus bar and an electrically insulating housing for mounting them,
The high voltage bus bar and the low voltage bus bar are wired separately on opposite surfaces of the housing,
Each terminal of the electromagnetic relay is welded to the connection terminal portion of the high voltage bus bar and the low voltage bus bar,
The housing is formed with a through-hole penetrating between the surface on the high voltage bus bar side and the surface on the low voltage bus bar side,
The main body of the electromagnetic relay is arranged on the surface of the housing where the low voltage bus bar is wired,
Only the terminal of the electromagnetic relay and the connection terminal portion of the low-voltage bus bar are inserted into the through hole of the casing and protrude to the surface of the casing opposite to the main body of the electromagnetic relay,
The connection terminal portion of the high-voltage bus bar and the low-voltage bus bar is welded to the terminal of the electromagnetic relay on a surface opposite to the side where the main body of the electromagnetic relay is arranged in the housing. (1).
A second invention is an electromagnetic relay incorporated in a part of a high voltage circuit, a high voltage bus bar constituting a part of the high voltage circuit, and a low voltage through which a low voltage current for driving the electromagnetic relay flows. A high-voltage device module having a bus bar and an electrically insulating housing for mounting them,
The high voltage bus bar and the low voltage bus bar are wired separately on opposite surfaces of the housing,
Each terminal of the electromagnetic relay is welded to the connection terminal portion of the high voltage bus bar and the low voltage bus bar,
The housing is formed with a through-hole penetrating between the surface on the high voltage bus bar side and the surface on the low voltage bus bar side,
The main body of the electromagnetic relay is disposed on the surface of the housing on which the high voltage bus bar is wired,
Only the terminal of the electromagnetic relay and the connection terminal portion of the high-voltage bus bar are inserted into the through hole of the housing and protrude to the surface of the housing opposite to the main body of the electromagnetic relay,
The connection terminal portion of the high-voltage bus bar and the low-voltage bus bar is welded to the terminal of the electromagnetic relay on a surface opposite to the side where the main body of the electromagnetic relay is arranged in the housing. (2).

Next, the effects of the present invention will be described.
In the high voltage device module, the high voltage bus bar and the low voltage bus bar are wired separately on the opposite surfaces of the casing. Therefore, mutual insulation between the high voltage bus bar and the low voltage bus bar can be ensured by the housing itself. Therefore, it is not particularly necessary to consider the distance between the high-voltage bus bar and the low-voltage bus bar. Compared to the case where the high-voltage bus bar and the low-voltage bus bar are wired on the same surface of the housing, the housing is much larger. Can be reduced in size. Moreover, since the freedom degree of wiring of a high voltage bus bar and a low voltage bus bar becomes large, the freedom degree of arrangement | positioning of the input terminal and output terminal of a high voltage bus bar and a low voltage bus bar becomes high.

  Each terminal of the electromagnetic relay is welded to the high voltage bus bar and the low voltage bus bar. Therefore, contact resistance does not occur at the junction between each terminal of the electromagnetic relay and the high-voltage bus bar and the low-voltage bus bar, and heat generation at the junction can be suppressed.

  As described above, according to the present invention, it is possible to provide a high-voltage device module that has a high degree of freedom in wiring, can be easily miniaturized, and generates little heat.

In the present invention (Claim 1), the high-voltage device module may include one electromagnetic relay or a plurality of the electromagnetic relays.
In addition, the high-voltage device module can be mounted with other electronic components together with the electromagnetic relay. In this case, it is preferable that the terminals of the other electronic components are also welded to the high voltage bus bar or the low voltage bus bar.

Further, the high voltage bus bar and the connection terminal portions of the low-voltage bus bar, the surface opposite to the side where the body of the electromagnetic relay in the housing is arranged, that is welded to the terminals of the electromagnetic relay.
Thereby , welding with the connection terminal part of a high voltage bus bar and a low voltage bus bar and the terminal of an electromagnetic relay can be performed easily. That is, since the connection terminal portions of the high voltage bus bar and the low voltage bus bar are arranged on a common surface in the casing, welding can be performed from the same direction, and workability is improved. Further, since these connection terminal portions are arranged on the surface of the casing on the side where the main body of the electromagnetic relay is not arranged, the main body of the electromagnetic relay does not interfere with the welding operation.

Moreover, it is preferable that the connection terminal part of the said high voltage bus bar and the said low voltage bus bar and the terminal of the said electromagnetic relay are connected by laser welding (Claim 3).
In this case, since heat generation during welding can be reduced, the heat load on the electromagnetic relay can be suppressed.

A high voltage device module according to an embodiment of the present invention will be described with reference to FIGS.
The high voltage device module 1 of the present example includes an electromagnetic relay 2 incorporated in a part of the high voltage circuit 10, a high voltage bus bar 3 constituting a part of the high voltage circuit 10, and a drive for driving the electromagnetic relay 2. It has a low-voltage bus bar 4 through which a low-voltage current flows, and an electrically insulating housing 5 on which these are mounted. In addition, in FIG. 1, description of the terminal of electronic components, such as the electromagnetic relay 2, is abbreviate | omitted.

As shown in FIGS. 1 to 4, the high voltage bus bar 3 and the low voltage bus bar 4 are wired separately on the opposite surfaces of the housing 5. In this example, the low voltage bus bar 4 is disposed on the surface of the housing 5 on which the main body 20 of the electromagnetic relay 2 is disposed, and the high voltage bus bar 3 is disposed on the opposite surface. Here, the surface on which the main body 20 of the electromagnetic relay 2 is disposed is referred to as a front side surface 51, and the opposite side surface is referred to as a back side surface 52. 2 shows the wiring of the low-voltage bus bar 4 on the front side surface 51 of the housing 5, and FIG. 3 shows the wiring of the high-voltage bus bar 3 on the back side surface 52 of the housing 5.
The housing 5 is made of a resin molded body, and as shown in FIG. 4, a through hole 53 for inserting the terminal 21 and the like of the electromagnetic relay 2 is appropriately formed.

As shown in FIGS. 4 and 5, each terminal 21 of the electromagnetic relay 2 is welded to the high voltage bus bar 3 and the low voltage bus bar 4.
The connection terminal portions 31 and 41 of the high-voltage bus bar 3 and the low-voltage bus bar 4 are connected to the side of the electromagnetic relay 2 on the opposite side (back side surface 52) to the side where the main body 20 of the electromagnetic relay 2 is arranged. It is welded to the terminal 21. This welding is by laser welding.

  5A and 5B, the connection terminal portions 31 and 41 of the high-voltage bus bar 3 and the low-voltage bus bar 4 and the terminal 21 of the electromagnetic relay 2 have their tip surfaces in the same direction. The two are joined together and welded at the tip surfaces of the two. In FIGS. 5A and 5B, reference numeral 19 represents a welded portion.

  As shown in FIG. 6, the high-voltage device module 1 of this example is electrically connected between a battery 6 as a high-voltage DC power source and an inverter 7 that converts the DC power of the battery 6 into AC power. ing. The inverter 7 supplies the generated AC power to a rotating electric machine (not shown) to drive and control the rotating electric machine. The supply voltage of the battery 6 is a high voltage of, for example, 100V or higher.

  The high-voltage device module 1 includes a first electromagnetic relay 201 and a second electromagnetic relay 202 that are connected to the positive electrode side and the negative electrode side of the battery 6, respectively. The first electromagnetic relay 201 is connected to the positive power line 71 of the inverter 7, and the second electromagnetic relay 202 is connected to the negative power line 72 of the inverter 7.

Further, the high voltage equipment module 1 has a third electromagnetic relay 203 for precharging connected in parallel to the first electromagnetic relay 201. The third electromagnetic relay 203 is connected in series with the register 11, and a series circuit of the third electromagnetic relay 203 and the register 11 is connected in parallel with the first electromagnetic relay 201.
The second electromagnetic relay 202 is connected to the negative electrode of the battery 6 via the current sensor 12 connected in series.

The first to third electromagnetic relays 201 to 203 are operated by a drive signal from a control unit (ECU: electronic control device) 101.
Further, the inverter 7 has a capacitor 73 connected between the positive power line 71 and the negative power line 72.

As shown in FIG. 1, the high voltage device module 1 has first to third electromagnetic relays 201 to 203, a resistor 11, and a current sensor 12 mounted on a housing 5. All of the first to third electromagnetic relays 201 to 203, the resistor 11, and the current sensor 12 have the main bodies 20, 110, and 120 arranged on the front side 51 side of the housing 5.
As shown in FIGS. 3 and 4, the high voltage side terminal 211 of the electromagnetic relay 2, the terminal 111 of the register 11, and the terminal 121 of the current sensor 12 are all connected to the connection terminal portion 31 of the high voltage bus bar 3. Welded.
As shown in FIGS. 2 and 4, the low voltage side terminal 212 of the electromagnetic relay 2 is welded to the connection terminal portion 41 of the low voltage bus bar 4.

As shown in FIG. 3, the high voltage bus bar 3 is connected to a pair of input terminals 331 and a pair of output terminals 332 for high voltage. The battery 6 is connected to the pair of input terminals 331, and the inverter 7 is connected to the pair of output terminals 332.
Further, as shown in FIG. 2, the low voltage bus bar 4 is connected to a connector 43 that is a connecting portion with the control unit 101.

  The electromagnetic relay 2 drives the contact portion by applying an electromagnetic force by the signal current supplied from the control unit 101 to the pair of terminals 212 on the low voltage side via the low voltage bus bar 4 to conduct and cut off. It is configured so that it can be switched. Thereby, a high voltage current flowing from the battery 6 to the inverter 7 side via the pair of terminals 211 on the high voltage side of the electromagnetic relay 2 can be passed or cut off. The signal current is a low voltage current of 16 V or less, for example.

  As shown in FIG. 6, the high voltage device module 1 of this example is used by being incorporated in a high voltage circuit 10 for driving in a hybrid vehicle, for example. And when the signal at the time of starting the automobile is received, the electromagnetic relay 2 is driven by the drive signal from the control unit 101, and the capacitor of the inverter 7 is precharged by switching on and off as appropriate. The safety of the high-voltage circuit 10 is ensured by cutting off the power supply when an abnormality occurs in the high-voltage circuit 10 such as a failure 7.

For example, at the time of precharging, the high voltage device module 1 operates as follows.
First, in response to a signal at the time of starting the automobile, the second electromagnetic relay 202 and the third electromagnetic relay 203 are turned on by a drive signal from the control unit 101. As a result, the high voltage current of the battery 6 flows to the capacitor 73 of the inverter 7 via the third electromagnetic relay 203 and the resistor 11, and the capacitor 73 is charged. At this time, since the high voltage current flows to the capacitor 73 via the resistor 11, it is possible to prevent a large current from flowing when the current enters.
In this way, the capacitor 73 is gradually charged while preventing a large current from entering.

Next, when the charging of the capacitor 73 is substantially completed, the third electromagnetic relay 203 for precharging is turned off. Note that the second electromagnetic relay 202 is maintained in a connected state.
After that, the first electromagnetic relay 201 is turned on to maintain a constant conduction state for power distribution between the battery 6 and the inverter 7.

  Further, for example, when an abnormality occurs in the inverter 7 due to a failure of a switching element or the like in the inverter 7, the first electromagnetic relay 201 and the second electromagnetic relay 202 are turned off, and the battery 6 and the inverter are turned off. 7 is electrically cut off. Thereby, it is possible to prevent a high voltage current from continuing to flow through the high voltage circuit 10.

Next, as shown in FIGS. 1-4, an example of the assembly method of the high voltage apparatus module 1 of this example is demonstrated below.
First, the low voltage bus bar 4 is assembled to the housing 5 from the front side surface 51. At this time, as shown in FIG. 4, the connection terminal portion 41 of the low voltage bus bar 4 is inserted into the through hole 53 formed in the housing 5.
Next, the electromagnetic relay 2, the resistor 11, and the current sensor 12 are respectively attached to predetermined positions on the front side surface 51 of the housing 5. At this time, the terminals 21, 111, and 121 of the electromagnetic relay 2, the resistor 11, and the current sensor 12 are inserted into the through holes 53 of the housing 5.
Next, the high voltage bus bar 3 is assembled to the back side surface 52 of the housing 5.

Next, as shown in FIGS. 5A and 5B, the connection terminal portion 31 of the high-voltage bus bar 3 and the terminal 21 of the electromagnetic relay 2 are laser-welded to each other. That is, the connection terminal portion 31 of the high-voltage bus bar 3 and the terminal 21 of the electromagnetic relay 2 are overlapped with each other with their tip surfaces facing in the same direction. And the welding part 19 is formed by irradiating laser light L with respect to front end surfaces, such as the connection terminal part 31 and the terminal 21. FIG.
Further, the connection terminal portion 41 of the low voltage bus bar 4 and the terminal 21 of the electromagnetic relay 2 are laser-welded to each other by the same method.
Next, a resin cover is assembled on the back side surface 52 of the housing 5 so as to cover the high voltage bus bar 3 and the like (not shown).
Thus, the high voltage device module 1 is obtained.

Next, the function and effect of this example will be described.
In the high-voltage device module 1, the high-voltage bus bar 3 and the low-voltage bus bar 4 are wired separately on the opposite surfaces of the housing 5. Therefore, mutual insulation between the high voltage bus bar 3 and the low voltage bus bar 4 can be ensured by the housing 5 itself. Therefore, it is not particularly necessary to consider the line-to-line distance between the high voltage bus bar 3 and the low voltage bus bar 4, and compared with the case where the high voltage bus bar 3 and the low voltage bus bar 4 are wired on the same surface of the housing 5. Thus, the housing 5 can be greatly reduced in size. Moreover, since the freedom degree of wiring of the high voltage bus bar 3 and the low voltage bus bar 4 becomes large, the freedom degree of arrangement | positioning of the input terminals 331 and 43 and the output terminal 332 of the high voltage bus bar 3 and the low voltage bus bar 4 becomes high.

  Each terminal 21 of the electromagnetic relay 2 is welded to the high voltage bus bar 3 and the low voltage bus bar 4. Therefore, contact resistance does not occur at the junction between each terminal 21 of the electromagnetic relay 2 and the high voltage bus bar 3 and the low voltage bus bar 4, and heat generation at the junction can be suppressed.

  The connection terminal portions 31 and 41 of the high-voltage bus bar 3 and the low-voltage bus bar 4 are connected to the side of the electromagnetic relay 2 on the opposite side (back side surface 52) of the casing 5 to the side where the main body 20 of the electromagnetic relay 2 is arranged. It is welded to the terminal 21. Therefore, welding of the connection terminal portions 31 and 41 of the high voltage bus bar 3 and the low voltage bus bar 4 and the terminal 21 of the electromagnetic relay 2 can be easily performed. That is, since the connection terminal portions 31 and 41 of the high-voltage bus bar 3 and the low-voltage bus bar 4 are arranged on a common surface in the housing 5, welding can be performed from the same direction, and workability is improved. Moreover, since these connection terminal parts 31 and 41 are distribute | arranged to the surface of the housing | casing 5 by which the main body 20 of the electromagnetic relay 2 is not arranged, the main body 20 of the electromagnetic relay 2 will interfere with welding work. Nor.

  Moreover, the connection terminal parts 31 and 41 of the high voltage bus bar 3 and the low voltage bus bar 4 and the terminal 21 of the electromagnetic relay 2 are connected by laser welding. Therefore, since heat generation at the time of welding can be reduced, a heat load on the electromagnetic relay 2 can be suppressed.

  As described above, according to this example, it is possible to provide a high-voltage device module that has a high degree of freedom in wiring, can be easily miniaturized, and generates little heat.

  In the above embodiment, the low-voltage bus bar 4 is disposed on the front side surface 51 that is the surface of the casing 5 on the side where the main body 20 of the electromagnetic relay 2 is disposed, and the rear side surface 52 that is the opposite side is provided with a high voltage. Although an example in which the voltage bus bar 3 is provided has been shown, the present invention may be arranged by separating the high voltage bus bar 3 and the low voltage bus bar 4 on the front and back of the housing 5, and the high voltage bus bar 3 on the front side surface 51. And the low-voltage bus bar 4 can be provided on the back side surface 52.

Sectional explanatory drawing of the high voltage apparatus module in an Example. Plane explanatory drawing of the high voltage apparatus module seen from the front side surface of the housing | casing in an Example. The plane explanatory view of the high voltage apparatus module seen from the back side of the case in an example. Sectional explanatory drawing of the high voltage apparatus module which shows the connection state of the terminal in an Example. The (A) perspective view and (B) sectional view which show the welding state of the terminal of an electromagnetic relay and the connection terminal part of a high voltage bus bar (or low voltage bus bar) in an Example. Explanatory drawing of the high-voltage circuit incorporating the high-voltage apparatus module in an Example. Sectional explanatory drawing of the high voltage apparatus module which shows the connection state of the terminal in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High voltage apparatus module 10 High voltage circuit 2 Electromagnetic relay 201 1st electromagnetic relay 202 2nd electromagnetic relay 203 3rd electromagnetic relay 21 Terminal 3 High voltage bus bar 31 Connection terminal part 4 Low voltage bus bar 41 Connection terminal part 5 Case body

Claims (3)

Equipped with an electromagnetic relay incorporated in a part of the high voltage circuit, a high voltage bus bar constituting a part of the high voltage circuit, a low voltage bus bar through which a low voltage current for driving the electromagnetic relay flows, and these A high voltage equipment module having an electrically insulating casing,
The high voltage bus bar and the low voltage bus bar are wired separately on opposite surfaces of the housing,
Each terminal of the electromagnetic relay is welded to the connection terminal portion of the high voltage bus bar and the low voltage bus bar,
The housing is formed with a through-hole penetrating between the surface on the high voltage bus bar side and the surface on the low voltage bus bar side,
The main body of the electromagnetic relay is arranged on the surface of the housing where the low voltage bus bar is wired,
Only the terminal of the electromagnetic relay and the connection terminal portion of the low-voltage bus bar are inserted into the through hole of the casing and protrude to the surface of the casing opposite to the main body of the electromagnetic relay,
The connection terminal portion of the high-voltage bus bar and the low-voltage bus bar is welded to the terminal of the electromagnetic relay on a surface opposite to the side where the main body of the electromagnetic relay is arranged in the housing. High voltage equipment module. Equipped with an electromagnetic relay incorporated in a part of the high voltage circuit, a high voltage bus bar constituting a part of the high voltage circuit, a low voltage bus bar through which a low voltage current for driving the electromagnetic relay flows, and these A high voltage equipment module having an electrically insulating casing,
The high voltage bus bar and the low voltage bus bar are wired separately on opposite surfaces of the housing,
Each terminal of the electromagnetic relay is welded to the connection terminal portion of the high voltage bus bar and the low voltage bus bar,
The housing is formed with a through-hole penetrating between the surface on the high voltage bus bar side and the surface on the low voltage bus bar side,
The main body of the electromagnetic relay is disposed on the surface of the housing on which the high voltage bus bar is wired,
Only the terminal of the electromagnetic relay and the connection terminal portion of the high-voltage bus bar are inserted into the through hole of the housing and protrude to the surface of the housing opposite to the main body of the electromagnetic relay,
The connection terminal portion of the high-voltage bus bar and the low-voltage bus bar is welded to the terminal of the electromagnetic relay on a surface opposite to the side where the main body of the electromagnetic relay is arranged in the housing. High voltage equipment module.   3. The high voltage apparatus module according to claim 1, wherein the connection terminal portions of the high voltage bus bar and the low voltage bus bar and the terminals of the electromagnetic relay are connected by laser welding.

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