KR102435252B1 - Inverter for electric vehicles equipped with thermoelement cooler - Google Patents

Abstract

The inverter 100 for an electric vehicle equipped with a thermoelectric cooler according to the present invention is configured as follows.
a housing 101, a cooling plate 105 seated on the bottom surface of the housing 101, and a control unit 103 disposed on the cooling plate 105 to convert direct current into alternating current; and, the cooling plate 105 includes a flow path 107 having an inlet port (I) and a drain port (O) formed therein for circulating cooling water, and passes through the housing 101 to the inlet port (I). In the inverter for an electric vehicle including a connected nipple 109, and a drain nipple 111 connected to the drain hole (O) through the housing 101;
It includes a thermoelectric cooler 150 mounted on the acquisition nipple 109 to cool the acquisition nipple 109,
The thermoelectric element cooler 150,
A socket 151 formed to be combined with a cooling block 152 to be described later as being combined with the acquisition nipple 109, a cooling block 152 combined with the socket 151, and cooling to the cooling block 152 The thermoelectric element 153 to which the surface 1533 is in close contact, the heat dissipation block 154 to be in close contact with the heat dissipating surface 1535 of the thermoelectric element 153, and the heat dissipation fin 1545 of the heat dissipation block 154 are attached to It includes a heat dissipation fan 155 .
Therefore, the following effects can be exhibited.
Since it is possible to efficiently cool the inside of the electric vehicle inverter by supplying cooling water that is lower than room temperature to the cooling plate 105, an error occurs due to the heat accumulated inside the electric vehicle inverter. Accidents can be prevented in advance.

Description

Inverter for electric vehicle equipped with thermoelectric cooler {INVERTER FOR ELECTRIC VEHICLES EQUIPPED WITH THERMOELEMENT COOLER}

The present invention relates to an "inverter for an electric vehicle equipped with a thermoelectric cooler", and more particularly, to prevent overheating of the inverter for an electric vehicle, a thermoelectric cooler is used to circulate the cooled coolant, so that an efficient cooling function is possible It relates to an "inverter for an electric vehicle equipped with a thermoelectric element cooler", characterized in that it is configured to prevent a malfunction of the inverter for an electric vehicle.

Hereinafter, the inverter 1 for an electric vehicle according to the background art together with the accompanying drawings will be described as follows.

1 is a perspective view showing an inverter for an electric vehicle according to the background art and a cooling plate accommodated therein.

In recent years, electric vehicles using electricity, which is clean energy, as a power source are actually entering commercialization.

Such an electric vehicle converts a DC current supplied from a large-capacity storage battery into an AC current having a variable frequency to start a driving motor that supplies rotational force to the wheels. An inverter 1 is used.

In the inverter 1 for an electric vehicle, a control BD, a shielding plate, a gate BD, an IGBT, a current sensor module, an EMI filter, and a DC link are accommodated in the box-shaped housing 10 as shown in FIG. 1 .

However, the inverter 1 for an electric vehicle generates a large amount of heat during a switching operation, and since each of the components is made of a semiconductor element, there is a problem of causing malfunctions (sudden start, sudden stop) due to heat.

To solve this problem, the cooling plate 50 is accommodated at the bottom of the housing 10 . The cooling plate 50 has a flow path 51 through which cooling water can circulate therein, and an inlet and a drain hole are formed therein. A drain nipple 55 to be connected is configured.

In addition, a hose (not shown) is connected to the acquisition nipple 53, and a circulation pump (not shown) and a water tank (not shown) filled with coolant are connected to the hose, and a hose is connected to the water tank, It is connected to the drain nipple (55).

In addition, a temperature sensor (not shown) is mounted inside the housing 10 , and a control unit (not shown) connected to the temperature sensor to determine whether the circulation pump operates or not is also housed in the housing 10 . is made up of

However, according to this background art, there were the following problems.

The coolant, which has been circulated once by the circulation pump, is in a state of heat exchange while passing through the inside of the housing 10 and is in a state higher than room temperature. In particular, since the inside of the engine room is in a high temperature state by the heat generated when the motor is driven, the heat generated from the storage battery, and the bonnet heated by the solar heat inside the vehicle, the coolant is always at a temperature higher than room temperature when the vehicle is driven , for example, it is not possible to efficiently cool the inverter (1) for electric vehicles because it is maintained at 40 ~ 80 ℃. Accordingly, there is a problem in that an electrical error occurs, causing sudden start and sudden stop of the vehicle.

Korean Patent Publication No. 10-2018-0062493 (June 11, 2018)

The problems to be solved through the "inverter for an electric vehicle equipped with a thermoelectric element cooler" according to the present invention are as follows.

By supplying cooling water that is lower than room temperature to the cooling plate installed inside the inverter for electric vehicles, it enables efficient cooling of the interior of the inverter for electric vehicles, and an error occurs due to heat accumulated inside the inverter for electric vehicles. Therefore, it is possible to prevent traffic accidents due to sudden acceleration and sudden stops.

In order to solve the above problems, an inverter for an electric vehicle equipped with a thermoelectric cooler according to the present invention is configured as follows.

a housing, a cooling plate seated on the bottom surface of the housing, and a control unit disposed on the cooling plate to convert direct current into alternating current; In the inverter for an electric vehicle including a flow path formed with a drain hole, and a water nipple connected to the water inlet through the housing, and a drain nipple connected to the drain through the housing;

It includes a thermoelectric cooler mounted on the acquisition nipple to cool the acquisition nipple, and the thermoelectric cooler is a socket formed to be combined with a cooling block to be described later as being combined in the acquisition nipple, and a cooling block that is combined with the socket. , a thermoelectric element having a cooling surface in close contact with the cooling block, a heat dissipation block in close contact with the heat dissipation surface of the thermoelectric element, and a heat dissipation fan attached to a heat dissipation fin of the heat dissipation block.

In addition, the socket is, as the acquisition nipple is fitted, a clamp in which the plate material is curled in a C-shape, a plate-shaped connection part extending laterally from one end of the clamp, and a plate material as being connected to the connection part zigzag up and down It includes an insertion part that is bent repeatedly in a shape, and the cooling block is a plate-shaped thing fitted to the insertion part, and it is characterized in that it includes a plurality of cooling fins.

In addition, it includes a brush of a metal material that is inserted into the nipple,

The brush has a main wire, a plurality of brush bristles arranged along the longitudinal direction of the main wire, and a C-shaped connected to the front (opposite side of the housing) end of the main wire so that the opening faces the rear (housing side). Including a hooking wire, the brush bristles are formed so as to be bent and bent inside the acquisition nipple.

The inverter for an electric vehicle equipped with a thermoelectric cooler according to the present invention can exhibit the following effects.

Since it is possible to efficiently cool the inside of the inverter for electric vehicles by supplying cooling water that is lower than room temperature to the cooling plate, an error occurs due to the heat accumulated inside the inverter for electric vehicles. can be prevented in advance.

In particular, the socket can improve the cooling efficiency by maximally expanding the contact area with the cooling block, and since the cooling water passes in the state where the brush is accommodated in the water nipple, the contact area with the water nipple can be expanded as much as possible, so cooling efficiency can be improved.

In addition, the thermoelectric cooler can be designed to be compact and lightweight compared to a general cooling method using a compressor and refrigerant gas, and the cooling intensity can be adjusted because a plurality of them are mounted on the acquisition nipple.

1 is a perspective view showing an inverter for an electric vehicle according to the background art and a cooling plate accommodated therein.
2 is a perspective view showing an inverter for an electric vehicle equipped with a thermoelectric cooler according to the present invention;
3 is a perspective view illustrating a thermoelectric element cooler connected to a cooling plate accommodated in an inverter for an electric vehicle equipped with a thermoelectric element cooler according to the present invention;
4 is an exploded perspective view illustrating an exploded thermoelectric element cooler connected to a cooling plate of an inverter for an electric vehicle equipped with a thermoelectric element cooler according to the present invention;
5 is a perspective view illustrating a thermoelectric element cooler connected to a cooling plate of an inverter for an electric vehicle equipped with a thermoelectric element cooler according to the present invention;
6 is a perspective view illustrating two thermoelectric element coolers connected to a cooling plate of an inverter for an electric vehicle equipped with a thermoelectric element cooler according to the present invention;
Figure 7 is a cross-sectional view showing a process in which the brush is inserted into the inside of the nipple connected to the cooling plate of the inverter for an electric vehicle equipped with a thermoelectric element cooler according to the present invention.

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings. However, this is not intended to limit the technology described in this document to specific embodiments, and it should be understood that various modifications, equivalents, and/or alternatives of the embodiments of this document are included. In connection with the description of the drawings, like reference numerals may be used for like components.

In addition, expressions such as "first," "second," used in this document may modify various elements regardless of order and/or importance, and to distinguish one element from another element. It is used only and does not limit the corresponding components. For example, 'first part' and 'second part' may represent different parts regardless of order or importance. For example, without departing from the scope of rights described in this document, a first component may be referred to as a second component, and similarly, the second component may also be renamed as a first component.

In addition, terms used in this document are used only to describe specific embodiments, and may not be intended to limit the scope of other embodiments. The singular expression may include the plural expression unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meanings as commonly understood by one of ordinary skill in the art described in this document. Among the terms used in this document, terms defined in a general dictionary may be interpreted with the same or similar meaning to the meaning in the context of the related art, and unless explicitly defined in this document, ideal or excessively formal meanings is not interpreted as In some cases, even terms defined in this document cannot be construed to exclude embodiments of the present document.

Hereinafter, an embodiment of an inverter 100 for an electric vehicle equipped with a thermoelectric cooler according to the present invention for solving the above problems will be described in conjunction with the accompanying drawings.

2 is a perspective view illustrating an inverter for an electric vehicle equipped with a thermoelectric cooler according to the present invention.

The present invention includes a general configuration of an inverter for an electric vehicle as follows.

A control for converting a DC current into an AC current is configured with a rectangular tubular housing 101, a cooling plate 105 is mounted on the bottom surface of the housing 101, and disposed on the cooling plate 105 part 103 . In addition, the control unit 103 includes a control BD, a shielding plate, a gate BD, an IGBT, a current sensor module, an EMI filter, and a DC link. In addition, the cooling plate 105 includes a flow path 107 having an inlet port (I) and a drain port (O) formed therein for cooling water to circulate, and passes through the housing 101 to the inlet port (I). It includes a connected acquisition nipple 109, and a drain nipple 111 that passes through the housing 101 and is connected to the drain hole (O). In addition, a hose (H in FIG. 2) is connected to the acquisition nipple 109, and a circulation pump (not shown) and a water tank (not shown) filled with cooling water are connected to the hose (H), and to the water tank A hose (not shown) is connected to the drain nipple 111 . In addition, a temperature sensor (not shown) is mounted inside the housing 101, and a control unit (not shown) connected to the temperature sensor to determine whether the circulation pump operates or not is also housed inside the housing 101 . is made up of

In the present invention, the thermoelectric element cooler 150 is mounted on the acquisition nipple 109 to cool the cooling water passing through the acquisition nipple 109 to room temperature or less to circulate into the housing 101. It is configured to prevent errors.

Hereinafter, an embodiment of the thermoelectric element cooler 150 will be described in conjunction with the accompanying drawings.

3 is a perspective view illustrating that a thermoelectric element cooler is connected to a cooling plate accommodated in an inverter for an electric vehicle equipped with a thermoelectric element cooler according to the present invention, and FIG. 4 is an electric vehicle equipped with a thermoelectric element cooler according to the present invention It is an exploded perspective view showing that the thermoelectric element cooler connected to the cooling plate of the inverter is disassembled, and FIG. 5 is a perspective view showing the thermoelectric element cooler connected to the cooling plate of the inverter for an electric vehicle equipped with the thermoelectric element cooler according to the present invention. to be.

The thermoelectric cooler 150 is configured with a socket 151 formed to be combined with a cooling block 152 to be described later as being combined with the acquisition nipple 109, and a cooling block 152 above the socket 151. this is combined In addition, a thermoelectric element 153 to which a cooling surface 1533 is in close contact is configured on the upper surface of the cooling block 152 , and a heat dissipation block 154 is in close contact with the heat dissipating surface 1535 of the thermoelectric element 153 from the top. and a heat dissipation fan 155 is attached to the upper end of the heat dissipation fin 1545 of the heat dissipation block 154 .

The socket 151 is a metal material having elasticity, and as shown in FIG. 4 , the clamp 1511 in which the acquisition nipple 109 is fitted is formed with a C-shaped curled clamp 1511 . That is, since the acquisition nipple 109 is a circular tube and has elasticity, the C-shaped clamp 1511 is accommodated in the open state, and the acquisition nipple 109 is then closed to the original state while holding the acquisition nipple 109. configured to be in a state. Preferably, it is configured to be easily detachable from the upper part of the acquisition nipple 109 because it is formed to be opened downward. In addition, a plate-shaped connection part 1513 extending laterally from one end of the clamp 1511 is formed, and as a connection part 1513, the plate material is repeatedly bent in a zigzag shape up and down. Insertion part 1515 is formed Since the insertion part 1515 is a waveform that is repeatedly bent up and down, a plurality of U-shaped grooves 1517 are formed.

In addition, the cooling block 152 is inserted into the groove 1517 of the insertion part 1515, and a plurality of plate-shaped cooling fins 1521 are formed. Therefore, when each cooling fin 1521 of the cooling block 152 is fitted in the groove 1517 from the top to the bottom so that the cooling block 152 is mounted in the insertion part 1515, the cooling block 152 is The cooling fin 1521 is in a supported state to face downward. In addition, since both side surfaces and the lower end of the cooling fin 1521 are in close contact with the insertion unit 1515 , the contact area between the cooling block 152 and the insertion unit 1515 can be maximized. Therefore, it is possible to efficiently cool the cooling water circulating inside the acquisition nipple (109). If the cooling surface 1533 of the thermoelectric element 153 is directly contacted with the acquisition nipple 109 without the socket 151, the circular contact nipple 109 and the flat cooling surface 1533 come into contact with the surface contact. Since the non-linear contact is made, the contact area cannot be expanded as much as the socket 151 is interposed therebetween, so it is difficult to expect the cooling efficiency as much as that using the socket 151 .

6 is a perspective view showing that two thermoelectric element coolers are connected to the cooling plate of the inverter for an electric vehicle equipped with a thermoelectric element cooler according to the present invention, and when the length of the acquisition nipple 109 is extended, a plurality of thermoelectric element coolers Of course, the cooling efficiency can be improved by mounting 150.

7 is a cross-sectional view showing the process of inserting the brush inside the nipple connected to the cooling plate of the inverter for an electric vehicle equipped with a thermoelectric element cooler according to the present invention, to improve the cooling efficiency of the acquisition nipple (109) The brushes inserted for this purpose are as follows.

A brush 156 of a metal material to be inserted into the acquisition nipple 109 is configured, such a brush 156 is composed of a main wire 1561 long formed in a straight line, and a plurality of the main wire 1561 along the longitudinal direction. The brush bristles 1565 are arranged along the circumference of the main wire 1561 . And the open part (S) is connected to the rear (housing side) to the rear (housing side) in the front (opposite side of the housing) end (K) from the main wire 1561 and is caught on the acquisition nipple 109 C-shaped hooking wire (1567) is composed

Since the brush bristles 1565 are curved and bent inside the acquisition nipple 109, the contact area is improved, so that the cooling efficiency of the cooling water passing through the inside of the acquisition nipple 109 is improved.

In addition, the controller (not shown) supplies power to the thermoelectric element 153, the heat dissipation fan 155, and the circulation pump (not shown) when receiving temperature data greater than or equal to the set temperature from the temperature sensor (temperature sensor). It is configured to operate by application, and is programmed to turn off the power when a prescribed temperature is reached. The power may be supplied by a driving battery or a separate battery inside the vehicle.

Next, the driving process of the present invention will be described as follows.

First, the brush 156 is fitted to the acquisition nipple 109. At this time, the opening (S) of the engaging wire 1567 is caught on the acquisition nipple 109 as shown in FIG. In this state, when the acquisition nipple 109 and the engaging wire 1567 are inserted into the hose (H of FIG. 2) at the same time in this state, the brush 156 is not separated and the state supported inside the acquisition nipple 109 is maintained. And the brush bristles 1565 come into contact with the inner surface of the acquisition nipple 109 while being bent in a U-shape when accommodated in the acquisition nipple 109, as in FIG. 7 . As such, since it is bent, the contact area can be improved.

Next, a circulation pump (not shown) and a water tank (not shown) are connected to the hose (H in FIG. 2 ), and another hose (not shown) is connected to the moltong. In this state, the hose (not shown) connected to the water tank is connected to the drain nipple 111 .

In this state, power is applied to the control unit 103 of the inverter 100 for an electric vehicle to convert a DC current into an AC current to rotate the driving motor.

In this way, when the power is supplied and the controller (not shown) receives temperature data higher than the set temperature from the temperature sensor (not shown), the thermoelectric element 153 , the heat dissipation fan 155 , and the circulation pump (not shown) not), power is applied.

Then, the cooling surface 1533 of the thermoelectric element 153 is cooled and the heat dissipating surface 1535 is radiated heat. At this time, the heat dissipation fan 155 cools the heat dissipation surface 1535 because the external air passes through the heat dissipation fin 1545 to heat exchange, thereby preventing a decrease in the cooling efficiency of the cooling surface 1533 .

At the same time, since the circulation pump (not shown) is operated, the cooling water passes through the acquisition nipple 109. At this time, the cooling block 152 in close contact with the cooling surface 1533 of the thermoelectric element 153 is cooled while cooling fins. The insertion part 1515 of the socket 151 in close contact with the left and right sides of the 1521 and the lower end is cooled at the same time. And the connection part 1513, the clamp 1511 and the acquisition nipple 109 are cooled in succession. Next, the brush 156 accommodated in the inside of the acquisition nipple 109 is also cooled. At this time, since the brush bristles 1565 are bent in a U shape, the contact area with the acquisition nipple 109 is improved, thereby further improving cooling efficiency. In this state, the cooling water introduced into the acquisition nipple 109 circulates through the flow path 107 of the cooling plate 105 while being cooled by heat exchange by the acquisition nipple 109 and brush bristles 1565, and then the drain nipple 111 ) to return to the water tank (not shown) and then repeat the cycle again. At this time, since cooling water below room temperature circulates inside the housing 101, the cooling water can be efficiently cooled compared to the background art. In addition, even if the coolant is heated by the heat inside the housing 101 , it is cooled back to room temperature or lower by the thermoelectric cooler 150 , thereby preventing the loss of the function of the coolant. That is, since the coolant is heated by the heat inside the housing, heat generated by the drive motor, heat generated from the bonnet heated by solar heat, etc. can Accordingly, it is possible to effectively prevent an error (abrupt start or sudden stop) due to overheating of the control unit 103 .

In particular, since the socket 151 maximizes the contact area with the cooling block 152, the cooling efficiency can be improved, and the cooling water passes in the state where the brush 156 is accommodated in the acquisition nipple 109. Since the contact area with the nipple 109 can be maximized, the cooling efficiency can be improved.

In addition, the thermoelectric cooler 150 has the advantage of being able to adjust the cooling intensity because it is possible to design a compact and lightweight compared to a general cooling method using a compressor and refrigerant gas, and a plurality of them are mounted on the acquisition nipple 109 .

100: Inverter for electric vehicle equipped with thermoelectric cooler
101: housing 103: control unit
105: cooling plate 107: euro
109: inlet nipple 111: drain nipple
150: thermoelectric cooler 151: socket
1511: clamp 1513: connection
1515: insert 152: cooling block
1521: cooling fin 153: thermoelectric element
1533: cooling surface 1535: heat dissipation surface
154: heat dissipation block 1545: heat dissipation fins
155: heat dissipation fan 156: brush
1561: main wire 1565: brush bristles
1567: jamming wire

Claims (3)

delete a housing 101;
a cooling plate 105 seated on the bottom surface of the housing 101;
and a control unit 103 disposed on the cooling plate 105 to convert direct current into alternating current;
The cooling plate 105 includes a flow path 107 having an inlet (I) and a drain port (O) for circulating the cooling water therein,
A water nipple 109 connected to the water inlet (I) through the housing 101 and,
an inverter for an electric vehicle including a drain nipple (111) connected to the drain hole (O) through the housing (101);
It includes a thermoelectric cooler 150 mounted on the acquisition nipple 109 to cool the acquisition nipple 109,
The thermoelectric element cooler 150,
A socket 151 formed to be combined with a cooling block 152 to be described later as being combined with the acquisition nipple 109,
A cooling block 152 coupled to the socket 151;
A thermoelectric element 153 having a cooling surface 1533 in close contact with the cooling block 152;
a heat dissipation block 154 in close contact with the heat dissipation surface 1535 of the thermoelectric element 153;
and a heat dissipation fan 155 attached to the heat dissipation fin 1545 of the heat dissipation block 154,
The socket 151 is
A clamp 1511 in which the plate material is curled into a C-shape as that the acquisition nipple 109 is fitted and,
A plate-shaped connection portion 1513 extending laterally from one end of the clamp 1511,
It is connected to the connection part 1513 and includes an insertion part 1515 in which the plate material is repeatedly bent in a zigzag shape up and down,
The cooling block (152) is inserted into the insert (1515) and includes a plate-shaped cooling fin (1521).
3. The method of claim 2,
Including a brush 156 of a metal material that is inserted into the acquisition nipple 109,
The brush 156 is
a main wire 1561, and
A plurality of brush bristles 1565 arranged along the longitudinal direction on the main wire 1561,
In the main wire 1561, the opening (S) to the front (opposite side of the housing) end portion (K) of the main wire 1561 includes a c-shaped hooking wire 1567 connected to the rear (housing side),
The brush bristles 1565 are an inverter for an electric vehicle equipped with a thermoelectric cooler, characterized in that it is curved and bent inside the acquisition nipple 109.

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