CN207868999U - A kind of vehicle electric converting means - Google Patents

Abstract

The utility model discloses a vehicle electric power conversion device. It includes a liquid cooling radiator, a first power conversion unit and a second power conversion unit; the first power conversion unit is installed on the upper surface of the liquid cooling radiator, and the second power conversion unit is installed on the lower surface of the liquid cooling radiator. Each set of power conversion units is configured as a DC-AC power unit that converts DC current to AC current, a DC-DC power unit that converts DC power up or down, and an AC-DC power unit that converts AC current into DC current any of the. The two power conversion units of the utility model share a liquid-cooled radiator, and the power conversion units can be flexibly configured according to needs, and common components can be shared, the power density is high, and the manufacturing cost is low.

Description

A power conversion device for a vehicle

technical field

The utility model relates to the technical field of driving of new energy vehicles, in particular to a vehicle power conversion device.

Background technique

New energy vehicles (including hybrid vehicles and pure electric vehicles) have inconsistent requirements for their power conversion devices due to different design considerations. For new energy vehicles with low battery voltage and high motor voltage, a boost converter should be installed in the DC part of the front stage of the motor driver to boost the lower battery voltage to a high-voltage direct current sufficient to drive the motor. For new energy vehicles with dual-drive motors or dual-winding motors, two motor controllers are usually required to drive different motors or windings. For new energy vehicles equipped with high-power motors, drivers are usually connected in parallel to increase their output power. For the above-mentioned applications that require two converters/drivers, adopting a separate converter device or a single-sided integrated arrangement is not conducive to reducing the volume and improving the power density.

technical field

In order to meet the requirements of high power density and low manufacturing cost for new energy vehicle motor controllers and voltage converters, the utility model provides a vehicle power conversion device.

The technical scheme of the utility model is:

The power conversion device includes two sets of power conversion units, the two sets of power conversion units are respectively arranged on both sides of the liquid-cooled radiator, and share a liquid-cooled radiator; each set of power conversion units is configured to convert DC current into Any of a DC-AC power unit for alternating current, a DC-DC power unit for step-up or step-down conversion of direct current, and an AC-DC power unit for converting alternating current to direct current.

Each set of the power conversion unit includes a capacitor element, a power semiconductor element and a drive circuit board, the power semiconductor element is installed on the side of the liquid cooling radiator, the drive circuit board is connected to the power semiconductor element, and the power semiconductor element is connected to the capacitor element.

The power semiconductor element adopts IGBT tube and MOSFET tube made of Si material or SiC material.

The combination of the two sets of power conversion units is configured as a series combination of a DC-AC conversion unit that converts DC current into AC current and a DC-DC conversion unit that converts DC power into step-up or step-down conversion, or configures It is a parallel combination or terminal combination of two DC-AC conversion units that convert DC current into AC current.

The liquid cooling radiator is provided with a water channel for cooling power semiconductor elements, and a detachable thin plate is arranged in the middle of the water channel, and the detachable thin plate is placed between the two power semiconductor element heat dissipation structures of the two power conversion units, and the cooling liquid water channel is divided into The upper and lower parts are connected, one of which is used as a water inlet, and the other is used as a water outlet.

Both sides of the liquid-cooled radiator are respectively equipped with sealed casings, and the insides of the two sealed casings are respectively used as two chambers of the power conversion device, so that the two sets of power conversion units are respectively arranged in the two chambers.

The power conversion device includes an electrical power interface connected to two sets of power conversion units, and the electrical power interface is at least one set of DC terminals and at least one set of AC terminals.

When the combination of two sets of power conversion units is configured as a combination of a set of DC-DC conversion units and a set of DC-AC conversion units, the electrical power interface is configured as a set of DC terminals and a set of AC terminals; when two sets of power conversion units When the combination configuration is a combination of two sets of DC-AC conversion units, the electrical power interface is configured as a set of DC terminals and a set of AC terminals, or a set of DC terminals and two sets of AC terminals.

The power conversion unit is connected to several power busbars, and the power busbars are used to connect or disconnect the DC terminals or AC terminals of two sets of power conversion units and the DC terminals or AC terminals of the electrical power interface. The power busbar is divided into DC busbar and AC busbar. The DC busbar is used to connect or disconnect the DC terminal and DC terminal of the power conversion unit, and the AC busbar is used to connect or disconnect the AC terminal and AC terminal of the power conversion unit. . The DC and AC terminals are used for external connections to the battery and motor windings.

As an implementation manner, when the combination of two sets of power conversion units is configured as a combination of a set of DC-AC conversion units and a set of DC-DC conversion units, a pair of DC busbars are connected to the DC terminal and the DC-DC conversion unit Between the input terminals, another pair of DC busbars are connected between the output terminal of the DC-DC conversion unit and the DC terminal of the DC-AC conversion unit, and a set of AC busbars are connected between the AC terminal and the AC terminal of the DC-AC conversion unit between.

As another implementation manner, when the combination of two sets of power conversion units is configured as a combination of two sets of DC-AC conversion units, a pair of DC busbars are connected between the DC terminals and the DC terminals of the two DC-AC conversion units, One or two sets of AC busbars are respectively connected between the AC terminals and the AC terminals of the two sets of DC-AC conversion units.

The liquid cooling radiator is provided with a pass-through structure, and the power busbars located in different chambers pass through the pass-through structure and are connected to each other.

The two sets of power conversion units share one capacitive element or each use one capacitive element:

The case of sharing one capacitive element: the common DC terminals of the two sets of power conversion units are connected to the same capacitive element; and the liquid cooling radiator is provided with a pass-through structure, which is used to install and place the shared capacitive element;

The case of using one capacitive element each: the DC terminals of the two sets of power conversion units are respectively connected to one capacitive element, and the two capacitive elements are respectively arranged on the liquid cooling radiator, and a water channel is set in the liquid cooling radiator between the two capacitive elements , with the auxiliary capacitor for heat dissipation.

As an implementation manner, the power conversion device includes more than two sets of control circuit boards, and the two or more sets of control circuit boards respectively send control signals to two groups of power conversion units and receive processing feedback signals.

As another implementation, the power conversion device includes a set of control circuit boards, which are connected to the drive circuit boards of the two sets of power conversion units, and send control signals and receive processing feedback signals to the two sets of power conversion units , the two chambers are provided with installation positions for the installation of the control circuit board, the control circuit board is arranged in any chamber, and the control circuit board is arranged in any installation position of the two chambers as required.

In a specific implementation, the control circuit board is connected to the drive circuit board of one set of power conversion units, and the drive circuit board of the set of power conversion units is connected to the drive circuit board of the other set of power conversion units via connecting wires. The gate switch signal sent by the control circuit board is sent to a drive circuit board or the drive circuit board or the gate switch signal is sent to another drive circuit board or two drive circuits through another set of connection lines Board gate signals are kept synchronous.

For new energy vehicles with dual motors or dual winding motors, the two power conversion combinations in the power conversion device are configured as two DC-AC conversion units that convert DC current into AC current.

For new energy vehicles with low battery voltage and high motor voltage, the two power conversion units of the power conversion device are configured as a DC-DC conversion unit for step-up or step-down conversion of DC power and a DC-DC conversion unit for converting DC current into AC current DC-AC conversion unit. Among them, the DC-DC conversion unit is used to boost and transform the lower battery voltage into the high-voltage DC required by the motor driver, and the DC-AC conversion unit is used to convert the high-voltage DC into the AC required to drive the motor. At the same time, electric energy can flow in reverse, charging the battery through the motor.

Compared with the closest prior art, the beneficial effects of the utility model are:

In the technical solution of the utility model, the power conversion unit can be flexibly configured according to needs. For new energy vehicles with low battery voltage and high motor voltage, the power conversion unit can be configured as a combination of a DC-DC converter and a DC-AC converter. As a result, space for a separate DC-DC converter is saved, reducing costs.

In the technical solution of the utility model, a special detachable thin plate is arranged in the water channel of the liquid-cooled radiator to help form a cooling liquid return channel, so that the processing of the water channel is simple and the processing cost is saved.

In the technical solution of the utility model, the liquid-cooled radiator can optionally arrange a pass-through structure at the position where the capacitor is placed, so as to facilitate the sharing of the same DC capacitor by two sets of power conversion units, and reduce the number of components and the cost of components;

In the technical solution of the utility model, if the power conversion unit does not share the DC capacitor, a water channel can be arranged at the capacitor installation position of the liquid cooling radiator to enhance the heat dissipation of the capacitor and reduce the failure rate of the capacitor.

In the technical solution of the utility model, only one set of control circuit boards is used, and the cables connected to the drive circuit board are sequentially connected to the first set of drive circuit boards and the second set of drive circuit boards in order to save the number of components and installation process.

Description of drawings

FIG. 1 is a schematic diagram of the layout of the power conversion device;

Fig. 2 is a schematic diagram of the layout of the power conversion device using an independent capacitor solution;

Fig. 3 is a schematic diagram of the layout of the power conversion device using a shared capacitor solution;

FIG. 4 is a wiring diagram of the power conversion device configured as a combination of DC-DC and DC-AC conversion units;

Fig. 5 is a first wiring diagram in which the power conversion device is configured as a combination of two DC-AC conversion units;

6 is a second wiring diagram in which the power conversion device is configured as a combination of two DC-AC conversion units;

Fig. 7 is a schematic diagram of the line configuration from the control circuit board to the two drive circuit boards of the power conversion device.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Example 1

As shown in Figures 1 and 2, the power conversion device of this embodiment is mainly composed of a liquid-cooled radiator 2, two sets of power conversion units 3, 4, a control circuit board 7, and sealed casings 51, 52. The liquid-cooled radiator 2 Sealed casings 51, 52 are respectively installed on both sides, and the insides of the two sealed casings 51, 52 are respectively used as two chambers 61, 62 of the power conversion device. Two sets of power conversion units 3 and 4 are respectively arranged on both sides of the liquid cooling radiator 2, share a liquid cooling radiator 2, and are arranged in chambers 61 and 62 composed of two sealed casings 51 and 52 and the liquid cooling radiator .

The first set of power conversion unit 3 is arranged in the chamber 61 composed of the sealed casing 51 and the liquid cooling radiator 2. The first set of power conversion unit 3 includes a power semiconductor element 31, a driving circuit board 32 and a capacitor element 33. The power semiconductor element The element 31 is connected to the capacitor element 33 , the power semiconductor element 31 is installed on the side of the liquid cooling radiator 2 , and the drive circuit board 32 is connected to the power semiconductor element 31 .

The second set of power conversion unit 4 is arranged in the chamber 62 formed by the sealed casing 52 and the liquid cooling radiator 2. The second set of power conversion unit 4 also includes a power semiconductor element 41, a drive circuit board 42 and a capacitor element 43. The power The semiconductor element 41 is connected to the capacitor element 43 , the two power semiconductor elements 41 are installed on the side of the liquid cooling radiator 2 , and the driving circuit board 42 is connected to the power semiconductor element 41 .

For new energy vehicles using dual motors or dual-winding motors, the power conversion combination in the power conversion device 1 is configured as two DC-AC conversion units that convert DC current into AC current.

The wiring mode of the formed power conversion combination is shown in Figure 2. The first set of power conversion unit 3 is a DC-DC conversion unit, and the second set of power conversion unit 4 is a DC-AC conversion unit, so that the combination of the two sets of power conversion units It is configured as a series combination of a DC-AC conversion unit for converting DC current into AC current and a DC-DC conversion unit for step-up or step-down conversion of DC power. That is, as shown in FIG. 4, the DC terminal 81 is connected to the input terminal of the DC-DC conversion unit (power semiconductor element 31) through a DC busbar 91, and the output terminal of the DC-DC conversion unit is connected to the DC terminal through another DC busbar 92. - the input end of the AC conversion unit (power semiconductor element 41 ), the output end of the DC-AC conversion unit is connected to the AC terminal 82 via the AC busbar 93 . Both the DC terminal 81 and the AC terminal 82 use high voltage and high current connectors.

The two sets of power conversion units 3 and 4 each use a capacitive element, and the DC terminals of the power semiconductor elements of the two sets of power conversion units 3 and 4 are respectively connected to a respective capacitive element 33 and 34, and the capacitive elements 33 and 34 are both connected to the DC - on the DC busbar 92 between the DC conversion unit and the DC-AC conversion unit.

As shown in FIG. 2 , the bus capacitive components 33 and 43 of the two sets of power conversion units 3 and 4 are arranged near the DC input side of the power semiconductor components to reduce the stray inductance of the power loop. At the same time, the bus capacitor elements 33 and 34 are closely attached to the side surface of the liquid cooling radiator to enhance the heat dissipation effect. In addition, the liquid cooling radiator 2 is provided with water channels at the installation positions of the capacitor elements 33, 34, which further reduces heat dissipation thermal resistance, lowers the operating temperature of the capacitors, and increases their lifespan.

The power semiconductor components 31 and 41 of the two sets of power conversion units 3 and 4 are respectively mounted on the upper and lower surfaces of the liquid cooling radiator, and the liquid cooling radiator 2 is provided with corresponding cooling channels at corresponding positions for cooling the power semiconductor components. In order to simplify the water channel processing technology and save the processing cost, the water channel of the liquid cooling radiator is designed to directly penetrate the structure. A detachable thin plate 21 is arranged in the middle of the water channel, which divides the through water channel into two, so that the cooling water flows through the upper and lower surfaces of the liquid cooling radiator in turn, increasing the heat exchange of the cooling water at the same flow rate, so as to increase the cooling efficiency. The utility model realizes the above functions by adopting a detachable thin plate 21. The detachable thin plate is installed in the middle of the cooling water channel, and the directly penetrating water channel is divided into two parts 22, 23. After the cooling liquid flows through 22, it flows through 23 from the opposite direction, respectively. The power conversion units located in chamber 61 and chamber 62 are cooled.

Example 2

For new energy vehicles using high-power motors, the power conversion combination in the power conversion device 1 is configured as two DC-AC conversion units that convert DC current into AC current.

The difference between this embodiment and Embodiment 1 is that the wiring mode of the power conversion combination is shown in Figure 5, the first set of power conversion unit 3 is a DC-AC conversion unit, and the second set of power conversion unit 4 is a DC-AC conversion unit, so that the combination of the two sets of power conversion units is configured as a terminal combination of two DC-AC conversion units that convert DC current into AC current. That is, as shown in FIG. 5, the DC terminal 81 is connected to the input ends of two DC-AC conversion units (power semiconductor elements 31 and power semiconductor elements 41) through a DC busbar 92, and the output ends of the two DC-AC conversion units are connected via The respective AC busbars 93 are connected to the respective AC terminals 82 . Capacitive elements 33 , 34 are both connected to DC busbar 92 .

Example 3

For new energy vehicles using high-power motors, the power conversion combination in the power conversion device 1 is configured as two DC-AC conversion units that convert DC current into AC current.

The difference between this embodiment and Embodiment 1 is that the wiring mode of the power conversion combination is shown in Figure 6, the first set of power conversion unit 3 is a DC-AC conversion unit, and the second set of power conversion unit 4 is a DC-AC conversion unit, so that the combination of the two sets of power conversion units is configured as a parallel combination of two DC-AC conversion units that convert DC current into AC current. That is, as shown in FIG. 6, the DC terminal 81 is connected to the input ends of two DC-AC conversion units (power semiconductor elements 31 and power semiconductor elements 41) through a DC busbar 92, and the output ends of the two DC-AC conversion units are connected via The same AC busbar 93 is connected to the same AC terminal 82 . Capacitive elements 33 , 34 are both connected to DC busbar 92 .

Example 4

As shown in Figures 1 and 3, the power conversion device of this embodiment is mainly composed of a liquid-cooled radiator 2, two sets of power conversion units 3, 4, a control circuit board 7, and sealed casings 51, 52. The liquid-cooled radiator 2 Sealed casings 51, 52 are respectively installed on both sides, and the insides of the two sealed casings 51, 52 are respectively used as two chambers 61, 62 of the power conversion device. Two sets of power conversion units 3 and 4 are respectively arranged on both sides of the liquid cooling radiator 2, share a liquid cooling radiator 2, and are arranged in chambers 61 and 62 composed of two sealed casings 51 and 52 and the liquid cooling radiator .

The first set of power conversion unit 3 is arranged in the chamber 61 composed of the sealed casing 51 and the liquid cooling radiator 2. The first set of power conversion unit 3 includes a power semiconductor element 31, a driving circuit board 32 and a capacitor element 33. The power semiconductor element The element 31 is connected to the capacitor element 33 , the power semiconductor element 31 is installed on the side of the liquid cooling radiator 2 , and the drive circuit board 32 is connected to the power semiconductor element 31 .

The second set of power conversion unit 4 is arranged in the chamber 62 formed by the sealed casing 52 and the liquid cooling radiator 2. The second set of power conversion unit 4 also includes a power semiconductor element 41, a drive circuit board 42 and a capacitor element 43. The power The semiconductor element 41 is connected to the capacitor element 43 , the two power semiconductor elements 41 are installed on the side of the liquid cooling radiator 2 , and the driving circuit board 42 is connected to the power semiconductor element 41 .

The first set of power conversion unit 3 is a DC-DC conversion unit, and the second set of power conversion unit 4 is a DC-AC conversion unit, so that the combination of the two sets of power conversion units is configured as a direct current that converts direct current into alternating current - A series combination of an AC conversion unit and a DC-DC conversion unit for step-up or step-down conversion of DC power. That is, as shown in FIG. 4, the DC terminal 81 is connected to the input terminal of the DC-DC conversion unit (power semiconductor element 31) through a DC busbar 91, and the output terminal of the DC-DC conversion unit is connected to the DC terminal through another DC busbar 92. - the input end of the AC conversion unit (power semiconductor element 41 ), the output end of the DC-AC conversion unit is connected to the AC terminal 82 via the AC busbar 93 . Both the DC terminal 81 and the AC terminal 82 use high voltage and high current connectors.

The two sets of power conversion units 3 and 4 share one capacitive element. For the power conversion unit configuration with a common DC bus 92 , the number of components and the cost are further reduced by sharing the bus capacitor. The arrangement is as shown in FIG. 3 , the liquid cooling radiator is arranged with a through structure 34 at the position of the bus capacitor to place the common capacitor 34 . The capacitive element 34 is connected to the DC bus bar 92 between the DC-DC conversion unit and the DC-AC conversion unit.

As shown in FIG. 2 , the bus capacitive components 33 and 43 of the two sets of power conversion units 3 and 4 are arranged near the DC input side of the power semiconductor components to reduce the stray inductance of the power loop. At the same time, the bus capacitor elements 33 and 34 are closely attached to the side surface of the liquid cooling radiator to enhance the heat dissipation effect. In addition, the liquid cooling radiator 2 is provided with water channels at the installation positions of the capacitor elements 33, 34, which further reduces heat dissipation thermal resistance, lowers the operating temperature of the capacitors, and increases their lifespan.

The power semiconductor components 31 and 41 of the two sets of power conversion units 3 and 4 are respectively mounted on the upper and lower surfaces of the liquid cooling radiator, and the liquid cooling radiator 2 is provided with corresponding cooling channels at corresponding positions for cooling the power semiconductor components. In order to simplify the water channel processing technology and save the processing cost, the water channel of the liquid cooling radiator is designed to directly penetrate the structure. A detachable thin plate 21 is arranged in the middle of the water channel, which divides the through water channel into two, so that the cooling water flows through the upper and lower surfaces of the liquid cooling radiator in turn, increasing the heat exchange of the cooling water at the same flow rate, so as to increase the cooling efficiency. The utility model realizes the above functions by adopting a detachable thin plate 21. The detachable thin plate is installed in the middle of the cooling water channel, and the directly penetrating water channel is divided into two parts 22, 23. After the cooling liquid flows through 22, it flows through 23 from the opposite direction, respectively. The power conversion units located in chamber 61 and chamber 62 are cooled.

Example 5

For new energy vehicles using high-power motors, the power conversion combination in the power conversion device 1 is configured as two DC-AC conversion units that convert DC current into AC current.

The difference between this embodiment and Embodiment 4 is: the wiring mode of the power conversion combination is shown in Figure 5, the first set of power conversion unit 3 is a DC-AC conversion unit, and the second set of power conversion unit 4 is a DC-AC conversion unit, so that the combination of the two sets of power conversion units is configured as a terminal combination of two DC-AC conversion units that convert DC current into AC current. That is, as shown in FIG. 5, the DC terminal 81 is connected to the input ends of two DC-AC conversion units (power semiconductor elements 31 and power semiconductor elements 41) through a DC busbar 92, and the output ends of the two DC-AC conversion units are connected via The respective AC busbars 93 are connected to the respective AC terminals 82 . The common capacitive elements 33 are all connected to the DC busbar 92 .

Example 6

For new energy vehicles using high-power motors, the power conversion combination in the power conversion device 1 is configured as two DC-AC conversion units that convert DC current into AC current.

The difference between this embodiment and Embodiment 4 is: the wiring mode of the power conversion combination is shown in Figure 6, the first set of power conversion unit 3 is a DC-AC conversion unit, and the second set of power conversion unit 4 is a DC-AC conversion unit, so that the combination of the two sets of power conversion units is configured as a parallel combination of two DC-AC conversion units that convert DC current into AC current. That is, as shown in FIG. 6, the DC terminal 81 is connected to the input ends of two DC-AC conversion units (power semiconductor elements 31 and power semiconductor elements 41) through a DC busbar 92, and the output ends of the two DC-AC conversion units are connected via The same AC busbar 93 is connected to the same AC terminal 82 . The common capacitive elements 33 are all connected to the DC busbar 92 .

For any of the above embodiments, the power conversion device 1 is equipped with only one control circuit board 7 for controlling the two sets of power conversion units 3 , 4 , and the control circuit board is placed in any one of the chambers 61 or 62 . In order to simplify the assembly, the control signal is connected to the two drive circuit boards 32, 42 in a daisy chain manner, as shown in FIG. 7 . The gate switch signal sent by the control circuit board 7 is sent to a drive circuit board 32 or 42 through a set of connection lines 73, and the drive circuit board 32 or 42 sends the gate switch signal to another drive circuit board 32 or 42 through another set of connection lines 74. Circuit board 42 or 32.

It can be seen from the above embodiments that the two power conversion units of the present invention share a liquid cooling radiator, and the power conversion units can be flexibly configured according to needs, and common components can be shared, with high power density and low manufacturing cost. Notable technical effect.

Claims (10)

1. a kind of vehicle electric converting means, it is characterised in that：The power-converting device includes two sets of power conversion units, institute It states two sets of power conversion units and is arranged in liquid cooling heat radiator (2) both sides, share a liquid cooling heat radiator (2)；It is described often to cover Power conversion unit is configured to convert direct current into the DC-AC power cell of alternating current, rises direct current The DC-DC power unit of pressure or decompression transformation and alternating current is converted to the AC-DC power cell of DC current In any one.

2. vehicle electric converting means as described in claim 1, it is characterised in that：Often covering the power conversion unit includes Capacity cell, power semiconductor and drive circuit board, power semiconductor are mounted on liquid cooling heat radiator (2) side, drive Dynamic circuit board connects power semiconductor, and power semiconductor connects capacity cell.

3. vehicle electric converting means as described in claim 1, it is characterised in that：It is equipped with and uses in the liquid cooling heat radiator (2) Detachable thin plate (21) is set among the water channel of cooling power semiconductor element, water channel, coolant liquid water channel is divided into upper and lower two Part, upper and lower two parts communicate, and one of part is connected with water inlet, another part is connected with water outlet.

4. vehicle electric converting means as described in claim 1, it is characterised in that：Liquid cooling heat radiator (2) the both sides difference Sealing shell is installed, the two chambers of the inside of two sealing shells respectively as power-converting device so that described two sets Power conversion unit is respectively arranged in two chambers.

5. vehicle electric converting means as described in claim 1, it is characterised in that：The power-converting device includes electric breathing exercise Rate interface (8), electric power interface (8) connect two sets of power conversion units, and the electric power interface (8) is at least one set of straight Flow terminal (81) and at least one set of ac terminal (82).

6. vehicle electric converting means as claimed in claim 5, it is characterised in that：Power conversion unit (3,4) connection Several power busbars (9), power busbar (9) are used to connect or disconnect the DC terminal or exchange end and electricity of two sets of power conversion units Between the DC terminal (81) or ac terminal (82) of gas power interface (8).

7. vehicle electric converting means as described in claim 1, it is characterised in that：It is provided on the liquid cooling heat radiator (2) Punch-through (26), the power busbar (9) for being located at different chamber interconnect afterwards across punch-through (26).

8. vehicle electric converting means as described in claim 1, it is characterised in that：Two sets of power conversion units (3,4) It shares a capacity cell or respectively uses a capacity cell：

The case where sharing a capacity cell：Two sets of public DC terminals of power conversion unit are commonly connected to the same capacitance member Part (34)；And punch-through (24) is disposed on the liquid cooling heat radiator (2), punch-through (24) is for installing and placing altogether Capacity cell (34)；

The case where respectively using a capacity cell：The DC terminal of two sets of power conversion units is connected respectively to a respective electricity Hold element (34), two capacity cells (34) are arranged in liquid cooling heat radiator (2) both sides, the interstitial fluid of two capacity cells (34) Setting water channel (25) in cold heat sink (2).

9. vehicle electric converting means as described in claim 1, it is characterised in that：The power-converting device includes a set of control Circuit board (7) processed, a set of control circuit board (7) connect with the drive circuit board of two sets of power conversion units, and two chambers are all provided with It is useful for the installation site of control circuit board (7) installation, control circuit board (7) is arranged in any chamber, control circuit board (7) It is arranged in any one installation site of two chambers as needed.

10. vehicle electric converting means as described in claim 1, it is characterised in that：The power-converting device includes a set of Control circuit board (7), control circuit board (7) are connected to a drive circuit board by a connecting line (73), and drive circuit board is again Another piece of driving plate is connected by another connecting line (74).