KR20200061762A - Low voltage dc-dc converter with a built-in battery - Google Patents

Abstract

Disclosed is a battery integrated low voltage DC-DC converter for an electric car or the like. The battery integrated low voltage DC-DC converter comprises: an integrated and insulated case having an upper part and a lower part which are opened to be formed in a flat rectangular box shape having an internal space covered by upper and lower cases, wherein the internal space is provided with a first area of the upper part and a second area of the lower part; a PCB assembly installed in the first area within the case and including an integrated control board for controlling the operation of the DC-DC converter, and a cooling module; a battery module installed in the second area within the case; a busbar electrically connecting the battery module to the PCB assembly; a high voltage side first terminal and a low voltage side second terminal installed at the outer surface of one side of the case to be electrically connected to the PCB assembly; and a cable guide provided in the PCB assembly to expose a cable connection entrance to the outside through a through hole formed at the upper case of the case.

Description

LOW VOLTAGE DC-DC CONVERTER WITH A BUILT-IN BATTERY

An embodiment of the present invention relates to a battery-integrated low-voltage DC-DC converter, and more particularly, to a battery-integrated low-voltage DC-DC converter for supplying power to electric components such as electric vehicles.

The core components that make up an electric vehicle include a high voltage battery that stores energy, a motor that drives the vehicle using battery energy, an inverter that drives the motor using battery direct current (DC, DC) power, and an electric load. It consists of a 12V battery that supplies power, and a low voltage DC-DC converter (LDC) that supplies power to an electric load that requires low voltage by reducing the vehicle's high voltage to a low voltage.

Lithium-ion batteries used in electric vehicles are high-voltage batteries and can be used in inverters (DC/AC inverters) to drive motors, but electric loads (eg lamps, heating wires, accessories, small motor drives, etc.) are still available. Since most of the low voltage 12V power sources are used, a low voltage DC-DC converter (LDC) that converts a high voltage DC voltage into a low voltage DC voltage is required.

In addition, although the battery uses a high voltage DC voltage, 12V power is still used for electric loads used in electric vehicles such as lamps, heating wires, accessories, and small motors. Therefore, a low voltage DC-DC converter (LDC) that converts a high voltage DC voltage mounted on a vehicle into a low voltage DC voltage is used to supply power to such a low power electric device.

An object of the present invention for solving the above-mentioned problems of the prior art is a battery-integrated low-voltage DC-DC converter (hereinafter referred to as'battery-integrated LCD') that integrates a battery module and a DC-DC converter. To provide.

Another object of the present invention is to provide a battery-integrated LCD effective for cost reduction by miniaturization, light weight, and simplification by integrating a control module used for a low voltage DC-DC converter (LCD) and a lithium battery module for electric load. .

In order to achieve the above technical problem, the battery-integrated low-voltage DC-DC converter (LCD) of the present invention (hereinafter referred to as'battery-integrated LDC'), the upper and lower parts are opened to the upper and lower cases. It is formed in a flat rectangular box shape having an inner space covered by the inner space, the inner space having an upper first region and a lower second region integral and insulated case; It is installed in the first area in the case, a PCB assembly including an integrated control board and a cooling module for controlling the operation of the DC-DC converter; A battery module installed in a second area in the case; A bus bar that electrically connects the battery module to a PCB assembly; A high voltage side first terminal and a low voltage side second terminal installed on one side of the case and electrically connected to the PCB assembly; And a cable guide provided on the PCB assembly and having a cable connection entrance exposed to the outside through a through hole formed in an upper case of the case.

In addition, in the present invention, the inner case of the upper case is provided with a heat dissipation block, and the heat dissipation block is in contact with the upper surface of the cooling module of the PCB assembly, so that heat generated in the PCB assembly is induced to the upper case.

In addition, in the present invention, the heat dissipation plate is provided on the lower portion of the PCB assembly, and the heat dissipation plate is in contact with the lower surface of the cooling module of the PCB assembly, so that heat generated in the PCB assembly is induced to the lower heat dissipation plate. have.

In addition, in the present invention, the lower case is provided with a concavo-convex portion having a surface shape corresponding to the corresponding surface of the battery module on the surface in contact with the battery module to seat the battery module to discharge the heat of the battery module to the outside through the lower case It is characterized by being made.

In addition, in the present invention, an upper cooling cover is provided on the upper portion of the PCB assembly, a lower cooling cover is provided on the lower portion, and components mounted on the PCB assembly are provided on opposite surfaces of the upper and lower cooling covers facing the PCB assembly. It is characterized by forming an acceptable groove portion, and forming uneven grooves on opposite outer surfaces of the upper and lower cooling covers to increase heat dissipation efficiency.

In addition, in the present invention, the PCB assembly is formed by separating the upper PCB and the lower PCB, the upper PCB is provided with an upper cooling cover, a central cooling plate is provided between the upper PCB and the lower PCB, the lower cooling under the lower PCB Provided with a cover, on the opposite surfaces of the upper and lower cooling covers facing the upper PCB and the lower PCB, forming grooves for receiving parts mounted on the PCB assembly, and outside the opposite sides of the upper and lower cooling covers. The surface is characterized by forming an uneven groove to increase heat dissipation efficiency.

In addition, in the present invention, the central cooling plate, the first cooling pole to connect the upper cooling cover and the lower cooling cover, and the second heat pole in direct contact with the elements mounted on the upper and lower PCB There are features.

According to the above-described features of the present invention, to provide a battery-integrated low-voltage DC-DC converter (LCD) (light-weight DC-DC converter, LDC) (hereinafter referred to as'battery-integrated LCD') of a lightweight, compact and simplified structure with an integrated heat dissipation structure Can be.

In addition, according to the present invention, the control module of the LDC and the battery management system used for the lithium battery system for electric load can be integrated to realize compactness, light weight, and simplification of the battery-integrated LDC, and through this, electric components such as electric vehicles. As it has an advantage that is effective in cost reduction.

1 is a perspective view of a battery-integrated low-voltage DC-DC converter (LCD) (hereinafter referred to as'battery-integrated LCD') according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of the battery-integrated LDC of FIG. 1.
Figure 3 is a side view showing the heat dissipation configuration of the PCB assembly in the DC of the battery-integrated low-voltage DC-DC converter according to the second embodiment of the present invention.
4 is a plan view of FIG. 3;
5 is an exploded perspective view showing a heat dissipation configuration of the PCB assembly in the DC of the battery-integrated low-voltage DC-DC converter according to the third embodiment of the present invention.
Figure 6 is an exploded perspective view showing the heat dissipation configuration of the PCB assembly in the DC of the battery-integrated low-voltage DC-DC converter according to the fourth embodiment of the present invention.
7 is an enlarged perspective view of a main part showing an operating state of a heat dissipation configuration of a PCB assembly in a fourth embodiment of the present invention.
8 is a cross-sectional view schematically showing a heat dissipation configuration of a PCB assembly in a fourth embodiment of the present invention.
9 is a block diagram schematically showing a system of a battery-integrated LCD according to embodiments of the present invention.
10 is a schematic block diagram of an electric vehicle power system capable of employing a battery-integrated LDC according to embodiments of the present invention.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing each drawing, similar reference numerals are used for similar components.

Terms such as first, second, A, and B may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component. The term and/or includes a combination of a plurality of related described items or any one of a plurality of related described items.

When an element is said to be "connected" to or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but may exist in the middle. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle.

The terminology used herein is only used to describe a specific embodiment, and is not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms related to “comprises”, “haves”, and the like are intended to indicate that there are features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Unless otherwise defined herein, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms, such as those defined in a commonly used dictionary, should be interpreted as meanings consistent with the contextual meaning of the related art, and are not to be interpreted as ideal or excessively formal meanings unless explicitly defined herein.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a battery-integrated low-voltage DC-DC converter (LCD) (hereinafter referred to as'battery-integrated LDC') according to a first embodiment of the present invention, and FIG. 2 is a battery-integrated battery of FIG. 1 As an exploded perspective view of the LDC, as shown, the battery-integrated LDC 100 according to the first embodiment of the present invention has a cooling square type and an insulated case in the form of a flat square box having a height lower than the length of the width and length ( 110).

The case 110 is a flat and rectangular box-shaped main case 111 in which the upper and lower portions are opened and an intermediate partition 111a is formed to divide the inner space into the upper first region 110a and the lower second region 110b. And, an upper case 112 coupled to cover the open upper portion of the main case 111, and a lower case 113 coupled to cover the open lower portion of the main case 111.

The PCB assembly 120 is disposed in the first region 110a, which is the upper region in the main case 111, and the battery module 130 is disposed in the second region 110b, which is the lower region.

On the outer surface of one side of the main case 111, a first terminal 141 on the high side and a second terminal 142 on the low side are installed to be electrically connected to the PCB assembly 120 in the main case 111, and the PCB assembly ( The cable guide 121 provided in the 120 is a configuration in which the connection inlet of the cable guide 121 is exposed to the outside of the case 110 through the through hole 112a formed in the upper case 112.

According to this configuration, for example, it is possible to perform the LDC function of charging a low-voltage battery in an electric vehicle and supplying low-voltage power to electric components while simply replacing the existing 12V lithium-ion battery mounted in the electric vehicle.

In the present invention, the low voltage is compared to a high voltage battery that supplies power to an inverter or drive motor of an electric vehicle, and may have a voltage range of several volts (V) to tens of volts. For reference, in the present invention, the high voltage may be 100 V or hundreds of volts or more.

Referring to FIG. 2 in more detail, in the battery-integrated LDC 100 according to the first embodiment of the present invention, the case 110 is a heat dissipation material containing aluminum sulfate (Al ₂ SO ₃ ) or the like. It may be configured, and may have a multi-sided heat dissipation structure for the PCB assembly 120 and the battery module 130 disposed therein.

In other words, with the multi-cooled insulation cooling structure design, efficient cooling or heat dissipation is possible by applying the multi-layer heat dissipation cooling integrated case by applying the plate PCB without using the existing water cooling and cooling fans.

The PCB assembly 120 disposed in the first region 110a (the upper region) of the main case 111 includes a PCB-to-DC converter that connects between the high-voltage terminal and the low-voltage terminal of the battery module 130. , An integrated control board for controlling the charge/discharge operation of the battery module 130 and the operation of the DC-DC converter, and a cooling module 122 for heat dissipation of the DC-DC converter and the integrated control board.

The high voltage terminal may be a high voltage side terminal of a DC-DC converter connected to the first terminal 141 or may be used as a concept including the first terminal 141. Similarly, the low voltage terminal is connected to the second terminal 142. It may be used as a concept including a second terminal 142 or a low voltage side terminal of a DC-DC converter to be connected.

A heat radiation block 112b is provided on the inner surface of the upper case 112 of the case 110, and the heat radiation block 112b is brought into contact with the upper surface of the cooling module 122 of the PCB assembly 120, so that the PCB assembly 120 The heat generated by directing the generated heat to the upper case 112 may be operated. In order to enhance the effect of the heat dissipation operation, the cooling module 122 of the PCB assembly 120 and the heat dissipation block 112b of the upper case 112 are preferably made of a material having excellent thermal conductivity, that is, heat dissipation efficiency.

In addition, the bottom of the PCB assembly 120 is provided with a heat dissipation plate 150, the heat dissipation plate 150 is in contact with the lower surface of the cooling module 122 of the PCB assembly 120, the heat generated in the PCB assembly 120 It may be a heat dissipation operation to direct directly to the lower heat dissipation plate 150. In order to increase the effect of such a heat dissipation operation, it is preferable that the heat dissipation plate 150 is made of a material having excellent thermal conductivity.

The lower case 113 may include a concavo-convex portion 113a having a surface shape corresponding to a corresponding surface of the battery module 130 on a surface in contact with the battery module 130 to seat the battery module 130. The uneven portion 113a may perform a heat dissipation function that discharges or radiates heat from the battery module 130 to the outside through the lower case 113.

The battery module 130 may include lithium ion battery cells. The battery module 130 may be formed as a single battery module 130 by arranging a plurality of cylindrical unit modules in the horizontal and vertical directions, and electrically connecting them in series, parallel, or in parallel via a bus bar 131. The bus bar 131 of the battery module 130 is provided with power terminals 131a extending upwardly, and the power terminals 131a penetrate through the intermediate partition 111a of the main case 111 to produce a PCB assembly ( 120).

The power terminals 131a may be partially provided with an insulating coating layer or partially covered with an insulating coating material, thereby protecting it from contact with external or other devices.

3 and 4 are side and plan views showing the heat dissipation configuration of the PCB assembly in the DC of the battery-integrated low-voltage DC-DC converter according to the second embodiment of the present invention, other configurations except the heat dissipation configuration of the PCB assembly are described above Since it is the same as in Example 1, a detailed configuration description and illustration are omitted. As shown, the heat dissipation configuration of the PCB assembly 220 in the second embodiment, the PCB assembly 220 is installed in the main assembly 211, the high-pressure side first terminal on one outer surface of the main case 211 (241) and the low pressure side second terminal 242 is installed is electrically connected to the PCB assembly 220 in the main case (211).

The PCB assembly 220 is provided with a cable guide 221 and a cooling module 222, and the heat dissipation plate 250 can be fixed to the lower surface of the cooling module 222 in contact with the lower surface. Therefore, the heat generated from the PCB assembly 220 can be directly radiated to the lower heat dissipation plate 250. In order to enhance the effect of such a heat dissipation operation, it is preferable that the heat dissipation plate 250 is made of a material having excellent thermal conductivity.

5 is an exploded perspective view showing the heat dissipation configuration of the PCB assembly in the DC of the battery-integrated low-voltage DC-DC converter according to the third embodiment of the present invention, other configurations except for the heat dissipation configuration of the PCB assembly is the same as the first embodiment described above Therefore, detailed configuration descriptions and illustrations are omitted. As shown, the heat dissipation configuration of the PCB assembly 320 in the third embodiment may include an upper cooling cover 312b on the upper portion of the PCB assembly 320 and a lower cooling cover 350 on the lower portion. have.

The upper cooling cover 312b and the lower cooling cover 350 are preferably made of a material having excellent thermal conductivity, for example, SIC, Sl ₃ N ₄ , Al ₂ O ₃ , and the phase facing the PCB assembly 320. , On the opposite surface of the lower cooling cover (312b,350) to form a groove for accommodating parts mounted on the PCB assembly 320, the upper and lower cooling cover (312b,350) on the opposite outer surface of the opposite surface An uneven groove can be formed to increase heat dissipation efficiency.

6 is an exploded perspective view showing the heat dissipation configuration of the PCB assembly in the DC of the battery-integrated low-voltage DC-DC converter according to the fourth embodiment of the present invention, other configurations except for the heat dissipation configuration of the PCB assembly are the same as in Embodiment 1 described above Therefore, detailed configuration descriptions and illustrations are omitted. As illustrated, in the fourth embodiment, the heat dissipation configuration of the PCB assembly 420 separates the PCB assembly 420 into an upper PCB 421 and a lower PCB 422, and an upper portion on the upper PCB 421. A cooling cover 412b may be provided, a central cooling plate 423 may be provided between the upper PCB 421 and the lower PCB 422, and a lower cooling cover 450 may be provided under the lower PCB 422. .

The upper cooling cover 412b, the central cooling plate 423, and the lower cooling cover 450 are preferably made of a material having excellent thermal conductivity, for example, SIC, Sl ₃ N ₄ , Al ₂ O ₃ , and the upper PCB On the opposite surfaces of the upper and lower cooling covers 412b and 450 facing the 421 and the lower PCB 422, grooves are formed to accommodate components mounted on the PCB assembly 420, and upper and lower cooling covers are formed. An uneven groove may be formed on the opposite outer surface of the opposite surface of (412b,450) to increase heat dissipation efficiency.

7 is an enlarged perspective view of a main part showing an operating state of a heat dissipation configuration of a PCB assembly in a fourth embodiment of the present invention, the PCB assembly by the upper cooling cover 412b, the central cooling plate 423, and the lower cooling cover 450. The movement of heat generated in 420) can be induced as indicated by arrows in the drawing, whereby the efficiency of dissipating heat generated in the upper PCB 421 through the upper cooling cover 412b can be increased.

8 is a cross-sectional view schematically showing a heat dissipation configuration of another type of PCB assembly in the fourth embodiment of the present invention, as shown, in the fourth embodiment, the upper cooling cover 412b and the lower cooling in the central cooling plate 423 A first heat pole 423a connecting the cover 450 and a second heat pole 423b directly contacting the elements mounted on the upper and lower PCBs 421 and 422 may be integrally provided.

Therefore, the upper cooling cover 412b and the lower cooling cover 450 are connected by the first heat pole 423a, and the elements mounted on the upper and lower PCBs 421 and 422 are centered by the second heat pole 423b. As it directly contacts the cooling plate 423, it is possible to increase the efficiency of dissipating heat generated from the PCB assembly 420 through the upper and lower cooling covers 412b and 450.

9 is a block diagram schematically showing a system of a battery-integrated LCD according to embodiments of the present invention.

Referring to FIG. 9, the battery-integrated LCD 100 according to embodiments of the present invention includes a PCB assembly 120, 220, 320, 420 having a high voltage region 100a, a low voltage region 100b, and an integrated control board. The integrated control board of the high voltage region 100a and the PCB assembly 120, 220, 320, 420 can share a control circuit for DC-DC, and the integrated control board of the low voltage region 100b and the PCB assembly 120, 220, 320, 420 is a battery The control circuit for (battery) can be shared.

The control circuit for DC-DC is a digital control circuit of an integrated system algorithm operation method and may be connected to a DC-DC power module through a hardware interface (IC/F) for DC-DC. The DC-DC power module may correspond to a DC-DC converter. The DC-DC power module can supply relatively high voltage power to a high voltage load of a device or equipment such as an electric vehicle. The control circuit for DC-DC can control the DC-DC power module to convert the high voltage applied to the input terminal of the DC-DC power module to a low voltage.

The control circuit for a battery may be connected to the battery cell module through a hardware interface (I/F) for the battery. The battery cell module may include lithium ion battery cell modules. The lithium ion battery cell modules may form a first battery pack in a first battery cell group including at least a part of the battery cell modules. The battery cell module may include a plurality of battery packs. The battery cells in each battery cell group may be manufactured to have a predetermined rated voltage and a rated current by being electrically connected in series or in parallel with each other.

The integrated control board of the PCB assembly (120, 220, 320, 420) is a DC-DC (DC-DC) control circuit and a battery (battery) control circuit through at least one or both of the hardware interface for the DC-DC and the hardware interface for the battery The connection or disconnection operation can be controlled.

According to this embodiment, the integrated control board of the PCB assembly (120,220,320,420) includes battery monitoring to measure or manage parameters such as voltage, current, and temperature of the battery; Battery cell control to control the battery charging capacity, etc.; It can perform integrated system control functions for other battery diagnosis, control, and communication. The integrated control board of the PCB assembly may have at least some functions of a hybrid power control unit (HPCU). That is, in the present invention, the HPCU integrated DC-DC converter is configured integrally with a lithium battery.

It is composed of a power stage that controls power, a lithium battery and a battery management system (BMS) integrated board for control, a lithium battery, and a case with heat dissipation. The case having a heat dissipation function is composed of a multi-faceted heat dissipation structure, and is connected to internal PCB boards to make an effective heat dissipation function. According to this configuration, the self-cooling (natural cooling) method of the present embodiment has a large savings in size and price compared to the existing water cooling method.

The integrated system control of the PCB assembly may be implemented to store a program for a battery management system algorithm, an integrated control logic, etc. in a memory or storage device and perform this in a processor. A device comprising a processor and memory may be referred to as a controller.

Here, the BMS algorithm may include a software module for battery cell balancing, battery state (state of charge, SOC) estimation, and the like. The integrated control logic may include a BMS control algorithm and an LDC control algorithm, or a combination algorithm thereof.

In addition, the integrated system control of the PCB assembly may include hardware, software, or a combination of them for simulation of power density and thermal analysis of the printed circuit board. According to this integrated system algorithm operation method, there is an effect that can improve the performance and efficiency of the device.

Meanwhile, the battery-integrated LCD 100 of the present embodiment may further include a power relay assembly (PRA), a fuse unit, a wire harness mounted on a printed circuit board or an integrated control board. . The power relay assembly may include positive and negative main relays, pre-charge relays, pre-auto resistors, and battery current sensors, and may further include a function of controlling a high voltage power circuit between a high voltage battery and a DC-DC converter. have.

10 is a schematic block diagram of an electric vehicle power system capable of employing a battery-integrated LDC according to embodiments of the present invention.

Referring to FIG. 10, the battery-integrated LCD 100 according to embodiments may be used in the power train 200 of an electric vehicle. In this case, the power train 200 of the electric vehicle supplies power to the high voltage load 202, the inverter 203, and the electric motor 204 through the high voltage battery 201, and the high voltage battery ( 201) can be charged.

In addition, the power train 200 converts the power of the high voltage battery 201 or the power of the generator 205 through the LDC 207 of the battery-integrated LDC 100 to charge the low voltage battery 208 or the low voltage load ( 206).

According to the above-described embodiments, it is possible to provide a battery-integrated LCD having an integrated heat dissipation structure in a lightweight, compact and simplified structure. In addition, by integrating the control module of the existing LDC and the battery management system used in the lithium battery system for electric load, it is possible to realize the miniaturization, light weight, and simplification of the battery-integrated LDC, and through this, it is possible to reduce costs as electric vehicle parts such as electric vehicles. It has an effective advantage.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You can understand that you can.

Claims (7)

The upper and lower parts are opened and formed in a flat square box shape having an inner space covered by the upper and lower cases, the inner space being an integral and insulated case having a first upper region and a second lower region;
It is installed in the first area in the case, a PCB assembly including an integrated control board and a cooling module for controlling the operation of the DC-DC converter;
A battery module installed in a second area in the case;
A bus bar that electrically connects the battery module to the PCB assembly;
A high voltage side first terminal and a low voltage side second terminal installed on one side of the case and electrically connected to the PCB assembly; And
A battery-integrated low-voltage DC-DC converter comprising a cable guide provided on the PCB assembly and having a cable guide through which a cable connection inlet is exposed through a through hole formed in an upper case of the case. The battery according to claim 1, wherein a heat dissipation block is provided on the inner surface of the upper case, and the heat dissipation block is brought into contact with the upper surface of the cooling module of the PCB assembly to induce heat generated from the PCB assembly to the upper case. All-in-one low voltage DC to DC converter. The method of claim 1, wherein the lower portion of the PCB assembly is provided with a heat dissipation plate, the heat dissipation plate is in contact with the lower surface of the cooling module of the PCB assembly is characterized in that to induce the heat generated in the PCB assembly to the lower heat dissipation plate Battery-integrated low-voltage DC-DC converter. The method of claim 1, wherein the lower case is provided with a concave-convex portion having a surface shape corresponding to the corresponding surface of the battery module on the surface in contact with the battery module to seat the battery module to discharge the heat of the battery module to the outside through the lower case Battery-integrated low-voltage DC-DC converter, characterized in that. According to claim 1, It has an upper cooling cover on the upper portion of the PCB assembly, the lower cooling cover is provided at the bottom,
The opposite surfaces of the upper and lower cooling covers facing the PCB assembly form grooves that can accommodate components mounted on the PCB assembly, and concave and convex grooves are formed on opposite sides of the opposite surfaces of the upper and lower cooling covers to form heat. A battery-integrated low-voltage DC-DC converter characterized by increasing efficiency. The method of claim 1, wherein the PCB assembly is formed by separating the upper PCB and the lower PCB, an upper cooling cover is provided on the upper PCB, a central cooling plate is provided between the upper PCB and the lower PCB, and lower cooling is provided on the lower PCB. It has a cover,
On the opposite surfaces of the upper and lower cooling covers facing the upper PCB and the lower PCB, grooves are formed to accommodate components mounted on the PCB assembly, and concave-convex grooves are formed on opposite outer surfaces of the upper and lower cooling covers opposite surfaces. A low-voltage DC-DC converter integrated with a battery, which is formed to increase heat dissipation efficiency. The method according to claim 6, wherein the central cooling plate is provided with a first heat pole connecting the upper cooling cover and the lower cooling cover, and a second heat pole in direct contact with an element mounted on the upper and lower PCB. Battery-integrated low-voltage DC-DC converter.

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