Power conversion device and energy storage device

Abstract

A power conversion device and an energy storage device, relating to the technical field of heat dissipation of energy storage devices. The power conversion device comprises a housing and a first partition plate; a first accommodating cavity is formed in the housing; the first partition plate divides the first accommodating cavity into a first channel and a second channel; a first component is arranged in the first channel, and a second component is arranged in the second channel; a first ventilation hole is formed in the first partition plate; the first ventilation hole is communicated with the first channel and the second channel; an air inlet and an air outlet are formed in the housing; and the air inlet, the first channel, the first ventilation hole, the second channel and the air outlet are sequentially communicated to form a ventilation channel. According to the present application, two cavities, i.e., the first channel and the second channel, are constructed, so that devices having different power ratings and power densities in the power conversion device can be separated; and the first channel and the second channel are arranged to form a series ventilation channel, to sequentially perform heat dissipation on the components in the first channel and the second channel, thereby improving the efficiency of ventilation and heat dissipation.

Description

Power conversion device and energy storage device

[0001] The present application claims priority to the Chinese patent application No. 202410411679.7, filed on April 7, 2024, and entitled "Power conversion device and energy storage device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of heat dissipation of energy storage devices, and in particular to a power conversion device and an energy storage device. BACKGROUND

[0003] With the development of the new energy industry, the power of power conversion devices and the like is continuously increasing, and the power consumption of internal components is also continuously increasing. With the increasing power and power density of inverters, the heat generation and heat consumption density of the internal components, single board current flow and cables in the inverter case are also increasing, and the heat-sensitive components such as electrolytic capacitors are in the case. The internal temperature rise of the case directly determines the service life of these components, thereby affecting the service life and failure rate of the inverter.

[0004] At present, power conversion devices such as string-type inverters can adopt a split-cavity design, in which high-power electronic components are located in a high-specification component area, and external fans, heat exchangers and inductors (low-power components) are located in a low-specification component area. The cooling system is a same group of fans blowing cold air into the case, and the cooling air is divided into two parts to enter different specification component areas. The amount of cooling air is difficult to meet the current high-power and high-power density requirements. SUMMARY

[0005] The present application provides a power conversion device and an energy storage device. By constructing two cavities of a first channel and a second channel, different power and power density components in the power conversion device can be partitioned, and the first channel and the second channel are set as a series of ventilation channels. The cooling air entering from the air inlet can pass through the first channel and the second channel in turn, first dissipating heat for the low-power and low-power density components in the first channel, and then dissipating heat for the high-power and high-power density components in the second channel, thereby improving the efficiency of ventilation and heat dissipation.

[0006] In a first aspect, the present application provides a power conversion device, comprising a shell and a first partition plate, the shell having a first containing cavity therein, and the first partition plate separating the first containing cavity into a first channel and a second channel; the first channel is provided with a first component, and the second channel is provided with a second component.

[0007] The first partition plate is provided with a first ventilation hole, the first ventilation hole is communicated with the first channel and the second channel, the shell is provided with an air inlet and an air outlet, the air inlet, the first channel, the first ventilation hole, the second channel and the air outlet are communicated in sequence to form a ventilation channel.

[0008] The first channel and the second channel are two cavities, different power and power density devices in the power conversion device can be partitioned, the first channel and the second channel are arranged in series to form a ventilation channel, cooling air entering from the air inlet can pass through the first channel and the second channel in sequence, the low-power and low-power density devices in the first channel are cooled first, and then the high-power and high-power density devices in the second channel are cooled, the fans installed in the first channel and the second channel provide cooling air for the whole channel, and the efficiency of ventilation and heat dissipation is improved.

[0009] In a possible implementation, the first channel is provided with a second partition plate, the second partition plate divides the first channel into a first sub-channel and a second sub-channel, the second partition plate is provided with a second ventilation hole, the second ventilation hole is communicated with the first sub-channel and the second sub-channel, the first ventilation hole is connected with the second sub-channel and the second channel, the first component is arranged in at least one of the first sub-channel and the second sub-channel, the first ventilation hole and the air inlet are located on the same side of the extension direction of the first partition plate, and the air inlet and the air outlet are located on two sides of the extension direction of the first partition plate.

[0010] The air inlet, the first sub-channel, the second ventilation hole, the second sub-channel, the first ventilation hole, the second channel and the air outlet are communicated in sequence.

[0011] In the embodiment, the air inlet and the air outlet can be located on opposite sides of the shell, the air inlet position and the air outlet position are isolated to match the air outlet position and the air return position of the heat exchanger on the other side, so that the heat exchanger has a larger heat exchange surface area. In the embodiment, the first channel is divided into a first sub-channel and a second sub-channel by the second partition plate, so that the air entering from the air inlet can flow in the first sub-channel first, and then flow from the second sub-channel to the second channel and flow along the second channel to the air outlet. Similar to the first channel, the length of the second channel along the ventilation direction is greater than the width, and a smaller ventilation section can have a larger ventilation rate, so that the ventilation rate of the cooling air to the devices in the second channel is improved.

[0012] In a possible implementation manner, the first channel is provided with a first circuit board, and the first sub-channel and the second sub-channel can be stacked in the thickness direction of the first circuit board, so that when the first circuit board is located in the first sub-channel and / or the second sub-channel, the first sub-channel and the second sub-channel can form a double-channel structure stacked in the height direction of the channel, and the overall size of the first channel does not appear to be too large in one of the length, width, and height (for example, when the stacking direction of the first sub-channel and the second sub-channel is consistent with the length direction of the circuit board, the length of the first channel is twice the length of the circuit board (if the ventilation cross-sectional areas of the first sub-channel and the second sub-channel are significantly different, the ventilation rates of the two sub-channels will be reduced, and the heat dissipation efficiency will be reduced)), the length and width of the first sub-channel and the second sub-channel can be consistent with the first circuit board, and the height of the first sub-channel and the second sub-channel is related to the height of the device mounted on the first circuit board, and does not cause the first sub-channel and the second sub-channel to form a large height, so as to form a first channel with a more balanced length, width, and height.

[0013] In a possible implementation manner, the second partition plate is a circuit board, or the second partition plate is provided with a circuit board, and at least one surface of the circuit board is provided with a first component, so that the second partition plate can be provided with a heat exchange device while separating the first channel, and the space utilization in the device is improved.

[0014] In a possible implementation manner, the first partition plate is provided with a third ventilation hole at one end away from the air inlet in the extension direction, and at least one of the first sub-channel and the second sub-channel communicates with the second channel through the third ventilation hole. When the heat dissipation demand in the second channel is not high, the air in the first channel after being heated can be partially discharged from the air outlet, and the heat dissipation air in the first channel does not need to flow through the second channel, so that the first channel can enter a larger amount of heat dissipation air, so as to improve the ventilation air volume of the first channel and improve the heat dissipation efficiency of the device in the first channel.

[0015] In a possible implementation manner, the first ventilation hole is located at one side of the first partition plate away from the air inlet in the extension direction, the air inlet and the air outlet are located at the same side of the first partition plate in the extension direction, and the ventilation directions of the first channel and the second channel are opposite, so that the air inlet and the air outlet can be connected with an external heat exchanger at one side of the shell.

[0016] In a possible implementation manner, at least one of the first channel and the second channel is provided with a fan to input cooling air into the first channel and the second channel.

[0017] In a possible implementation manner, the first channel is provided with a first fan, and the second channel is provided with a second fan, and the total air volume of the first fan is less than the total air volume of the second fan.

[0018] In the embodiment, when the space volume of the first channel is less than the space volume of the second channel, and / or when the heat dissipation requirement of the device in the second channel is higher than the heat dissipation requirement of the device in the first channel to a large extent (the first channel and the second channel are under the same ventilation section and ventilation rate, and the heat dissipation requirement of the first component in the first channel is met but the heat dissipation requirement of the second component in the second channel is not met), such as when the power and power density of the second component in the second channel are greater than the power and power density of the first component in the first channel, the number and / or the area of the high-power and high-power-density components mounted in the first channel are greater than the number and / or the area of the low-power and low-power-density components mounted in the first channel, and the total air volume of the first fan is less than the total air volume of the second fan, the heat dissipation requirement in the second channel that is greater than the heat dissipation requirement in the first channel can be met, and the higher heat dissipation requirement in the second channel can be met.

[0019] In a possible implementation, the second channel is provided with a third partition plate, the third partition plate divides the second channel into a third sub-channel and a fourth sub-channel, the air outlet is arranged in the fourth sub-channel, the third sub-channel is located on the side of the fourth sub-channel away from the air outlet, the third partition plate is provided with a fourth ventilation hole, the fourth ventilation hole communicates the third sub-channel and the fourth sub-channel, and the fan in the second channel is arranged in the fourth ventilation hole. The third partition plate can fix the fan in the channel.

[0020] In a possible implementation, the second channel is provided with a third partition plate, the third partition plate divides the second channel into a third sub-channel and a fourth sub-channel, the air outlet is arranged in the fourth sub-channel, the third sub-channel is located on the side of the fourth sub-channel away from the air outlet, the third partition plate is provided with a fourth ventilation hole, the fourth ventilation hole communicates the third sub-channel and the fourth sub-channel, and the fan in the second channel is arranged in the fourth ventilation hole. The third partition plate can fix the fan in the channel.

[0021] In a possible implementation, the second channel is provided with a fourth partition plate, the fourth partition plate divides the second channel into a fifth sub-channel and a sixth sub-channel, and the second component is arranged in the fifth sub-channel.

[0022] The inflow ends of the fifth sub-channel and the sixth sub-channel are communicated, the inflow ends of the fifth sub-channel and the sixth sub-channel are communicated with the first channel, the outflow ends of the fifth sub-channel and the sixth sub-channel are communicated, and the outflow ends of the fifth sub-channel and the sixth sub-channel are communicated with the air outlet.

[0023] In the embodiment, when the wind flows to one side of the second channel, the fourth partition plate divides the second channel into a fifth sub-channel and a sixth sub-channel. When the wind flows through the fifth sub-channel for the first time, a part of the wind flows from one end of the fifth sub-channel to the other end of the fifth sub-channel and is discharged from the air outlet to the first containing cavity, and another part of the wind flows from the communication part between the fifth sub-channel and the sixth sub-channel into the sixth sub-channel. When the wind flows through the fifth sub-channel again, the air volume in the fifth sub-channel can be increased, thereby improving the heat dissipation effect of the wind on the second channel.

[0024] In a possible implementation, at least one of the fifth sub-channel and the sixth sub-channel is provided with a fan, so that the fifth sub-channel and the sixth sub-channel can flow in a set direction.

[0025] In a possible implementation, the fifth sub-channel and the sixth sub-channel are respectively provided with fans, the direction of the wind of the fan in the fifth sub-channel is opposite to the direction of the wind of the fan in the sixth sub-channel, so that the fifth sub-channel and the sixth sub-channel can flow in a set direction, and part of the wind in the sixth sub-channel can return to the fifth sub-channel.

[0026] In a possible implementation, the fourth partition plate is a circuit board, or a circuit board is arranged on the fourth partition plate, and at least one surface of the circuit board is provided with the second component.

[0027] In the embodiment, the circuit board can be provided with the second component on one surface, the fifth sub-channel and the sixth sub-channel can be provided with the second component, the component in the sixth sub-channel can be mounted on the fourth partition plate, and the component in the fifth sub-channel can be mounted on the fourth partition plate or the bottom wall of the fifth sub-channel. The wind can flow in the fifth sub-channel and the sixth sub-channel, and the components in the fifth sub-channel and the sixth sub-channel can be cooled, thereby improving the space utilization efficiency while meeting the heat dissipation demand.

[0028] In a possible implementation, the housing is further provided with a second containing cavity, and the second containing cavity and the first containing cavity are separated by a fifth partition plate.

[0029] The second containing cavity is provided with a heat exchanger, the heat exchanger has an internal circulation channel, the internal circulation channel is in communication with the air inlet and the air outlet respectively, and the heat exchanger is used for cooling the medium discharged from the air outlet to provide cooling medium to the air inlet. The heat exchanger can be a tubular heat exchanger with heat dissipation fins, and the high-temperature medium flowing through the heat exchanger is cooled by heat exchange with the external space. Alternatively, the heat exchanger can be matched with a compressor, a throttling valve and other refrigeration devices to cool the high-temperature medium of the heat exchanger.

[0030] In a second aspect, the present application provides an energy storage device, comprising a battery and the power conversion device according to any one of the above, wherein the battery and the power conversion device are connected, and the power conversion device is used for power conversion of electric energy to charge and discharge the battery.

[0031] In a third aspect, the present application provides an energy storage device, comprising a photovoltaic panel, an alternating current combiner box and the power conversion device according to any one of the above, wherein the photovoltaic panel, the power conversion device and the alternating current combiner box are connected in series, and the power conversion device is used for converting variable direct current voltage of the photovoltaic panel into power frequency alternating current and transmitting to the alternating current combiner box. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 is a structural schematic diagram of the power conversion device;

[0033] Fig. 2 is a top view of the internal structure of the power conversion device;

[0034] Fig. 3a is a structural schematic diagram of the power conversion device according to an embodiment of the present application;

[0035] Fig. 3b is an exploded schematic diagram of a surrounding plate, a first cover plate and a second cover plate according to an embodiment of the present application;

[0036] Fig. 4 is a sectional view of A-A in Fig. 3a;

[0037] Fig. 5 is a sectional view of B-B in Fig. 3a;

[0038] Fig. 6 is a sectional view of C-C in Fig. 3a;

[0039] Fig. 7 is a sectional view of D-D in Fig. 3a;

[0040] Fig. 8 is a structural schematic diagram of the first fan located on the side away from the air inlet according to an embodiment of the present application;

[0041] Fig. 9 is a structural schematic diagram of the second fan located on the side away from the air outlet according to an embodiment of the present application;

[0042] Fig. 10 is a structural schematic diagram of the first fan located on the side away from the air inlet according to another embodiment of the present application;

[0043] Fig. 11 is a structural schematic diagram of the components arranged in the second sub-channel according to an embodiment of the present application;

[0044] Fig. 12 is a structural schematic diagram of the first fan and the second fan arranged in the first channel and the second channel according to an embodiment of the present application;

[0045] Fig. 13 is a structural schematic diagram of the fifth sub-channel and the sixth sub-channel according to an embodiment of the present application;

[0046] Fig. 14 is a schematic view of the structure of the fifth sub-passage according to an embodiment of the present application;

[0047] Fig. 15 is a schematic view of the structure of the sixth sub-passage according to an embodiment of the present application;

[0048] Fig. 16 is a schematic view of the structure of the power conversion device according to an embodiment of the present application;

[0049] Fig. 17 is a schematic view of the structure of the first passage and the second passage according to another embodiment of the present application;

[0050] Fig. 18 is a schematic view of the structure of the first passage according to another embodiment of the present application;

[0051] Fig. 19 is a schematic view of the structure of the second passage according to another embodiment of the present application;

[0052] Fig. 20 is a schematic view of the structure of the second passage according to another embodiment of the present application;

[0053] Fig. 21 is a schematic view of the structure of the first passage and the second passage according to another embodiment of the present application;

[0054] Fig. 22 is a schematic view of the structure of the fifth sub-passage and the sixth sub-passage according to another embodiment of the present application;

[0055] Fig. 23 is a schematic view of the structure of the fifth sub-passage and the sixth sub-passage according to another embodiment of the present application;

[0056] Fig. 24 is a schematic view of the structure of the second passage according to another embodiment of the present application;

[0057] Fig. 25 is a schematic view of the structure of the second accommodating cavity according to an embodiment of the present application;

[0058] Fig. 26 is a schematic view of a power storage device according to an embodiment of the present application;

[0059] Fig. 27 is a schematic view of another power storage device according to an embodiment of the present application.

[0060] 10 - power conversion device; 110 - housing; 110a - coaming; 110b - first cover plate; 110c - second cover plate; 111 - air inlet; 112 - air outlet; 120 - first partition; 121 - first vent; 122 - third vent; 130 - first accommodating cavity; 131 - first channel; 131a - first sub-channel; 131b - second sub-channel; 1311 - second partition; 132 - second channel; 1321 - third sub-channel; 1322 - fourth sub-channel; 1323 - fifth sub-channel; 1324 - sixth sub-channel; 140 - fan; 141 - first fan; 142 - second fan; 150 - third partition; 1501 - fourth vent; 160 - fourth partition; 170 - second accommodating cavity; 171 - heat exchanger; 21 - photovoltaic panel; 22 - AC combiner box; 23 - transformer; 24 - power grid; 25 - string inverter; 30 - energy storage cabinet; 310 - cabinet body; 320 - battery pack; 330 - energy storage converter. DETAILED DESCRIPTION

[0061] The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0062] For the convenience of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application will be explained and described below.

[0063] It should be clear that the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0064] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0065] It should be understood that the term "and / or" used herein is only to describe the same field of associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0066] Depending on the context, the word "if" as used herein can be interpreted to mean "when" or "while" or "in response to determining" or "in response to detecting." Similarly, the phrase "if it is determined" or "if [a stated condition or event] is detected" can be interpreted to mean "upon determining" or "in response to determining" or "upon detecting [the stated condition or event]" or "in response to detecting [the stated condition or event]."

[0067] It should be understood that "first", "second", etc. used in the present application are only for the purpose of distinguishing description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating or implying sequence.

[0068] In the description of the present application, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0069] As used herein, "in the range of", unless otherwise indicated separately, includes both end values of the range by default, for example, in the range of 1 to 5, including both 1 and 5.

[0070] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, it can also be detachable connection, it can also be abutting connection or integral connection; for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] The power equipment provided by the present application can include at least one of an inverter, a power storage converter (PCS), a direct current converter (DC-DC), a charging module, a power storage cabinet and a charging pile.

[0072] Among them, the inverter is an electronic device that converts direct current (DC) power into alternating current (AC) power, which is widely used in renewable energy fields such as solar power generation and wind power generation. The power storage converter (PCS), the direct current converter (DC-DC) and the charging module can be used as independent devices, or can be integrated in the power storage cabinet and the charging pile. The power storage converter (PCS) and the direct current converter (DC-DC) can be arranged in the power storage cabinet, and the charging module can be arranged in the charging pile.

[0073] The power conversion device 10 in this application takes an inverter as an example. Referring to FIG. 1 and FIG. 2, the power conversion device 10 can adopt a split cavity design and be divided into a high-specification device area 101 and a low-specification device area 102. In an embodiment, the high-specification device area 101 and the low-specification device area 102 are two cavities spaced apart from each other, and an air inlet blows external low-temperature cooling air into the cavity. In some inverters, as shown in FIG. 1, some inverters only blow air to the low-specification device area 102 for cooling, and the high-specification device area 101 is cooled by the cavity wall and the outside, and the cooling efficiency of the high-specification device area 101 is relatively low. In some inverters, as shown in FIG. 2, the high-specification device area 101 and the low-specification device area 102 are two cavities spaced apart from each other, and an air inlet 103 blows external low-temperature cooling air into the cavity and divides it into two parts to enter the high-specification device area 101 and the low-specification device area 102, respectively, and is finally discharged through an air outlet 104, resulting in a decrease in the amount of ventilation air in the high-specification device area 101 and the low-specification device area 102, and the cooling efficiency of the cooling air entering the cavity is not high, and a large fan is needed to cooperate with the ventilation and cooling, which is high in cost and accordingly causes a large size.

[0074] To solve the above problems, the power conversion device 10 in this application takes a string inverter structure as an example, as shown in FIG. 3a. The power conversion device 10 includes a shell 110 and a first partition plate 120. Referring to FIG. 3b, the shell 110 can include a surrounding plate 110a, a first cover plate 110b, and a second cover plate 110c. The surrounding plate 110a forms a channel extending along the Z direction, the first cover plate 110b can be sealingly connected to the Z direction side of the surrounding plate 110a, and the second cover plate 110c can be sealingly connected to the Z direction opposite side of the surrounding plate 110a. The surrounding plate 110a, the first cover plate 110b, and the second cover plate 110c can collectively form a containing cavity. It should be noted that in some drawings such as FIG. 3a, some structure lines are gray or dashed, indicating that the part of the line is inside the shell 110, and in order to more clearly show the internal structure of the shell 110, such as the channel, the opening, and the partition plate, some internal structures are shown.

[0075] It should be noted that FIG. 3b in this application shows an exploded view of the surrounding plate 110a, the first cover plate 110b, and the second cover plate 110c. The first cover plate 110b can be sealingly connected to the Z direction side of the surrounding plate 110a, and the second cover plate 110c can be sealingly connected to the Z direction opposite side of the surrounding plate 110a. In other drawings, the first cover plate 110b and the second cover plate 110c are omitted in order to better reflect the internal structure. The first cover plate 110b can be sealingly connected to the Z direction side of the surrounding plate 110a to form a sealed containing cavity together with the surrounding plate 110a.

[0076] In an embodiment, referring to FIG. 3a, FIG. 5, FIG. 6, FIG. 7 and FIG. 8, the housing 110 can be provided with a first accommodating cavity 130, and the circuit board can be installed in the first accommodating cavity 130, and the electronic devices, capacitors, inductors and other devices can be installed on the circuit board. The first partition plate 120 divides the first accommodating cavity 130 into a first channel 131 and a second channel 132, and the first channel 131 and the second channel 132 are both provided with components; wherein the first channel 131 is provided with first components such as capacitors and inductors with lower power and power density, and the second channel 132 is provided with second components such as electronic devices with higher power and power density.

[0077] In an embodiment, the first partition plate 120 and the housing 110 are provided with a first ventilation hole 121, referring to FIG. 3a and FIG. 5, the first partition plate 120 is provided with a gap at one end in the X direction close to the Z direction side, and the gap can form the first ventilation hole 121, and the first ventilation hole 121 can communicate the first channel 131 and the second channel 132.

[0078] In an embodiment, the housing 110 is provided with an air inlet 111 and an air outlet 112. Referring to FIG. 3a, the air inlet 111 can be provided on the cavity wall of the first channel 131, and the air outlet 112 can be provided on the cavity wall of the second channel 132. The air inlet 111 can be directly communicated with the X direction end of the first channel 131, and the air outlet 112 can be directly communicated with the X direction end of the second channel 132, and the air inlet 111 and the air outlet 112 can be located on the Z direction side of the first accommodating cavity 130. The air inlet 111, the first channel 131, the first ventilation hole 121, the second channel 132 and the air outlet 112 are sequentially communicated to form a heat dissipation channel in the first accommodating cavity 130. In an embodiment, a fan can be arranged in the heat dissipation channel to improve the ventilation speed in the channel. In an embodiment, a fan can be arranged at one end of the first channel 131 close to the air inlet 111, and two fans can be arranged at one end of the second channel 132 close to the first ventilation hole 121, and the two fans are connected in series in the same heat dissipation channel. The cooling air blown by the air inlet 111 first passes through the first channel 131 to dissipate heat for the devices with relatively low power and power density in the first channel 131, and the temperature of the air after heat dissipation will rise to a certain extent, but it can still pass through the first ventilation hole 121 into the second channel 132 to dissipate heat for the devices with relatively high power and power density in the second channel 132, and the hot air after heat dissipation can pass through the air outlet 112.

[0079] The embodiment of the present application can divide the devices with different power and power density in the power conversion device by constructing the first channel and the second channel, and set the first channel and the second channel as the serial ventilation channels, so that the cooling air entering from the air inlet can pass through the first channel and the second channel in sequence, and first radiate the devices with low power and low power density in the first channel, and then radiate the devices with high power and high power density in the second channel, thereby improving the efficiency of ventilation and heat dissipation.

[0080] The ventilation structure shown in FIG. 2 is that the low-specification device area 102 matches one fan, the high-specification device area 101 matches two fans, and the two channels are in parallel, and the fan only ventilates a single channel, and the ventilation air volume (it should be noted that the ventilation air volume in the embodiment refers to the air volume passing through in unit time, and the unit can be m3 / s) in each channel is insufficient. The embodiment of the present application sets the first channel and the second channel in sequence, and one fan can be set in the first channel corresponding to FIG. 2, and two fans can be set in the second channel corresponding to FIG. 2, and the three fans simultaneously radiate the serial first channel and second channel, thereby improving the ventilation air volume in each channel. Compared with the heat dissipation structure such as FIG. 2, the serial design of the air duct can improve the ventilation flux, and when the heat dissipation demand is met, the fan power or quantity can be reduced to reduce the heat dissipation cost; and the increase of the ventilation air volume improves the heat dissipation efficiency, and when the heat dissipation demand is met, the device volume of the power conversion device can be correspondingly reduced, and the demand for radiating the current high-power and high-power-density devices in a smaller accommodation cavity can also be met.

[0081] In an embodiment, referring to FIG. 3a, the power conversion device 10 includes a shell 110 and a first partition 120, and the inner wall surface of the shell 110 surrounds to form a first accommodation cavity 130. It can be understood that the square shell shown in the embodiment is only illustrative, and the shape of the shell 110 is not limited in the present application, and in some other embodiments, the shape of the shell 110 can also be one or more of a sphere, a cylinder and a prism, or other irregular shapes. The shell 110 is provided with an air inlet 111 and an air outlet 112, and the air inlet 111 and the air outlet 112 can be located on the side of the first accommodation cavity 130 in the Z direction, and the air inlet 111 and the air outlet 112 are oppositely arranged in the X direction, and the air inlet 111 and the air outlet 112 are located on the X direction side and the X direction side of the first accommodation cavity 130 respectively, and the air inlet 111 and the air outlet 112 are located on the opposite sides of the shell 110.

[0082] The first partition plate 120 is located inside the first accommodating cavity 130, and both ends of the first partition plate 120 along the X direction abut against the inner wall of the shell 110. The first partition plate 120 divides the first accommodating cavity 130 in the Y direction into a first channel 131 and a second channel 132. Both the first channel 131 and the second channel 132 are provided with components and devices. The first channel 131 can be provided with first components and devices such as capacitors and inductors with lower power and power density, and the first components and devices in the first channel 131 have lower heat generation. The second channel 132 can be provided with second components and devices such as electronic devices with higher power and power density, and the second components and devices in the second channel 132 have higher heat generation. The air inlet 111 can be located at one end of the first channel 131 and communicate with the first channel 131, and the air outlet 112 can be located at one end of the second channel 132 and communicate with the second channel 132.

[0083] In the embodiment, the air inlet 111 can be located at one end of the first channel 131 in the X direction, and the air outlet 112 can be located at one end of the second channel 132 in the X direction. It should be noted that in other possible embodiments, the positions of the air inlet 111 and the air outlet 112 can be the same as or different from the embodiment. The first partition plate 120 and the shell 110 have a first ventilation hole 121, which can be located at one end of the first partition plate 120 in the X direction. A notch is provided at one end of the first partition plate 120 in the X direction to form the first ventilation hole 121. The first ventilation hole 121 communicates the first channel 131 and the second channel 132. The first channel 131 and the second channel 132 can both be air ducts, and the first channel 131 and the second channel 132 are both used for circulating air to dissipate heat of the components and devices installed in the first channel 131 and the second channel 132.

[0084] The second partition plate 1311 can be laid inside the first channel 131, and two sides of the second partition plate 1311 along the thickness direction (consistent with the Z direction in FIG. 3a) can be perpendicular to or inclined to two sides of the first partition plate 120 along the thickness direction. The second partition plate 1311 can divide the first channel 131 along the Z direction into a first sub-channel 131a and a second sub-channel 131b, and at least one of the first sub-channel 131a and the second sub-channel 131b can be provided with a low-heat-capacity component such as a capacitor plate and an auxiliary source plate. The first sub-channel 131a can be formed by the surrounding plate 110a of the shell 110 along the X direction, the first partition plate 120, the second partition plate 1311, and the low-heat-capacity plate such as the capacitor plate and the auxiliary source plate provided in the first sub-channel 131a. The second sub-channel 131b can be formed by the surrounding plate 110a of the shell 110 along the X direction, the first cover plate 110b of the shell 110 along the Z direction, the first partition plate 120, and the second partition plate 1311. The first sub-channel 131a and the second sub-channel 131b can also be air ducts. Referring to FIGS. 3a and 4, one side of the second partition plate 1311 is provided with a second air vent 123, the second air vent 123 is located between the first sub-channel 131a and the second sub-channel 131b, and the first sub-channel 131a and the second sub-channel 131b are communicated at one side in the X direction through the second air vent 123. The air inlet 111, the first sub-channel 131a, the second air vent 123, the second sub-channel 131b, the first air vent 121, the second channel 132, and the air outlet 112 are sequentially communicated to form a series air duct.

[0085] The first channel 131 can be provided with a first fan 141, and the first fan 141 can be located in the first sub-channel 131a. The first fan 141 can be located at any position in the first sub-channel 131a, and the number of the first fan 141 can be at least one. In the embodiment, the first fan 141 can be located at one end of the first sub-channel 131a along the X direction, the first fan 141 can send air into the first sub-channel 131a in the X direction, and the number of the first fan 141 can be one.

[0086] In one embodiment, referring to FIG. 3a, the length of the first channel 131 in the X direction is greater than the width of the first channel 131 in the Y direction, the first channel 131 and the second channel 132 are arranged along the Y direction, and the air inlet 111 is located on the side opposite to the X direction of the first channel 131, so that the incoming air can flow in the X direction in the first channel 131. Compared with the heat dissipation scheme in which the air inlet 111 is arranged on the side of the Y direction of the first channel 131, the through hole is arranged at the middle position of the first partition plate 120 to discharge air into the second channel 132, and the air outlet 112 is arranged on the side opposite to the Y direction of the second channel 132, the heat dissipation air can flow in the first containing cavity 130 in the Y direction opposite to the X direction. In this embodiment, the flow direction of the heat dissipation air in the first channel 131 and the second channel 132 is parallel to the X direction, the heat dissipation air can flow through all the devices in the first channel 131, and the ventilation volume and ventilation rate in the first channel 131 and the second channel 132 can be improved, and the heat dissipation efficiency of the devices can be improved.

[0087] In one embodiment, the air inlet 111 and the air outlet 112 can be located on the opposite sides of the X direction and the X direction of the shell 110, and the air inlet position and the air outlet position are isolated to match the air outlet and air return positions of the heat exchanger on the other side. In this embodiment, the first channel 131 can be divided into a first sub-channel 131a and a second sub-channel 131b along the Z direction by the second partition plate 1311, so that the air entering the air inlet 111 can first flow in the X direction in the first sub-channel 131a, and then flow in the X direction opposite to the second sub-channel 131b to the X direction opposite to the second channel 132, and flow in the X direction of the second channel 132 to the air outlet 112. Similar to the first channel 131, the X direction length of the second channel 132 is greater than the Y direction width, and the smaller ventilation cross section can have a greater ventilation rate, which can improve the ventilation rate of the heat dissipation air to the devices in the second channel 132. Referring to FIG. 25, the side opposite to the Z direction of the first containing cavity 130 has a second containing cavity 170, and the second containing cavity 170 can be provided with a heat exchanger 171 having an internal circulation channel, and the two ends of the internal circulation channel are communicated with the air inlet 111 and the air outlet 112 respectively, and the heat exchanger 171 can dissipate the heat of the air discharged from the first containing cavity 130. Referring to FIG. 3a and FIG. 25, the air inlet 111 and the air outlet 112 can be located on the two sides of the X direction and the X direction opposite to the first containing cavity 130, and the corresponding heat exchanger 171 can extend along the X direction across the second containing cavity 170, which is perpendicular to the blowing direction (referring to the four arrow lines in FIG. 25) in the Y direction, so that the heat exchanger 171 has a larger heat exchange area, which can improve the heat dissipation of the high-temperature gas in the heat exchanger 171, and improve the heat dissipation efficiency of the devices in the first containing cavity 130.

[0088] The second channel 132 can be provided with a second fan 142, which can be located at any position in the second channel 132, and the number of the second fan 142 can be at least one. In the embodiment, the second channel 132 is provided with a third partition plate 150, the two sides of the third partition plate 150 along the thickness direction can be perpendicular or inclined to the two sides of the first partition plate 120 along the thickness direction, and the third partition plate 150 can divide the second channel 132 into a third sub-channel 1321 and a fourth sub-channel 1322 along the X direction, the third sub-channel 1321 is located on the side of the fourth sub-channel 1322 away from the air outlet 112, and the third sub-channel 1321 and the air outlet 112 are respectively arranged at both ends of the fourth sub-channel 1322 in the extension direction. In the embodiment, the second channel 132 on the side of the third partition plate 150 along the X direction is the third sub-channel 1321, the second channel 132 on the side of the third partition plate 150 along the X direction is the fourth sub-channel 1322, the air outlet 112 is arranged in the fourth sub-channel 1322, the third sub-channel 1321 is located on the side of the fourth sub-channel 1322 away from the air outlet 112, the first sub-channel 131a, the second sub-channel 131b, the third sub-channel 1321 and the fourth sub-channel 1322 are sequentially communicated, the third partition plate 150 is provided with a fourth vent hole 1501, the fourth vent hole 1501 penetrates the third partition plate 150 along the thickness direction of the third partition plate 150, the fourth vent hole 1501 communicates the third sub-channel 1321 and the fourth sub-channel 1322, the fan in the second channel 132 is arranged in the fourth vent hole 1501, the number of the fourth vent hole 1501 is at least one, and the second fan 142 is installed in the fourth vent hole 1501. The second fan 142 is located at one end of the second channel 132 along the X direction, and the number of the second fan 142 can be two. The second fan 142 blows air into the second channel 132 in the X direction.

[0089] In one embodiment, the total air volume of the first fans 141 is less than the total air volume of the second fans 142. The total air volume of the first fans 141 being less than the total air volume of the second fans 142 can include various scenarios, such as, for example, the air speed of the first fans 141 being the same as the air speed of the second fans 142, the number of the first fans 141 being less than the number of the second fans 142; or, for another example, the number of the first fans 141 being the same as the number of the second fans 142, the air speed of the first fans 141 being less than the air speed of the second fans 142; or, for yet another example, the air speed and the number of the first fans 141 being less than the air speed and the number of the second fans 142, etc. In one embodiment, the volume of the first channel 131 is less than the volume of the second channel 132, the number and / or the board area of the high power and high power density devices installed in the second channel 132 is greater than the number and / or the board area of the low power and low power density devices installed in the first channel 131, and the total air volume of the first fans 141 is less than the total air volume of the second fans 142, which can meet the requirement that the heat dissipation demand in the second channel 132 is greater than the heat dissipation demand in the first channel 131.

[0090] The air inlet 111 can be located at one end of the first channel 131 in the X reverse direction, and the air outlet 112 can be located at one end of the second channel 132 in the X direction, and the air in the first accommodating cavity 130 is discharged from the air outlet 112. Referring to FIGS. 3a and 4, the air sent by the air inlet 111 and the first fan 141 is transmitted in the first channel 131 along the solid arrow direction in FIG. 4, specifically, the air sent by the air inlet 111 and the first fan 141 flows in the X direction in the first sub-channel 131a, flows from the communication between the first sub-channel 131a and the second sub-channel 131b to the second sub-channel 131b and flows in the X reverse direction in the second sub-channel 131b. The second sub-channel 131b flows into the second channel 132 through the first vent hole 121 on the side of the X reverse direction. The air flowing from the second sub-channel 131b is transmitted to the second fan 142 and flows in the X direction in the second channel 132 through the second fan 142, and finally can flow out from the air outlet 112, so as to realize the heat dissipation of the components installed in the first channel 131 and the second channel 132. In this application, the air inlet 111, the first sub-channel 131a, the second sub-channel 131b, the first vent hole 121, the second channel 132 and the air outlet 112 are sequentially communicated to form a series air duct, and the air passes through the first sub-channel 131a with low heat dissipation demand, then enters the second channel 132 through the second sub-channel 131b and the first vent hole 121, not only improves the total air volume inside the second channel 132 and improves the heat dissipation capacity, but also the air exchanged with the first sub-channel 131a with low heat dissipation demand can continue to dissipate heat for the components in the second channel 132, realizes the multi-stage effective utilization of the air, and improves the heat dissipation efficiency. Moreover, this application also provides different air volume according to the different heat dissipation demands of the components in the first channel 131 and the second channel 132, and reduces the heat dissipation cost.

[0091] In one embodiment, referring to FIG. 8, the air inlet 111 and the air outlet 112 can be located on the positive direction and the reverse direction of the X direction of the shell 110 respectively, the air inlet 111 is located at one end of the first sub-channel 131a in the X reverse direction, and the air outlet 112 is located at one end of the second channel 132 in the X direction. The first channel 131 is divided into the first sub-channel 131a and the second sub-channel 131b arranged in the Z direction by the second partition plate 1311, and one end of the first sub-channel 131a in the X direction and one end of the second sub-channel 131b in the X direction are communicated.

[0092] A first fan 141 can be arranged in the first sub-passage 131a on the side of the first sub-passage 131a along the X direction. In an embodiment, the first fan 141 can cover the air outlet on the side of the first sub-passage 131a along the X direction, and the first fan 141 can blow air towards the positive direction of the X direction; in an embodiment, the first fan 141 can cover the air outlet on the side of the second sub-passage 131b along the X direction, and the first fan 141 can suck air towards the side of the X negative direction. The first fan 141 is arranged on the side of the first sub-passage 131a along the X direction, and the fan is arranged at the turning position of the air flow direction, which can improve the turning speed and pressure head of the air flow, and the air flow is relayed at the turning position, so as to improve the flow rate of the air flow in the first sub-passage 131a.

[0093] No fan 140 is arranged in the second passage 132, and the air flow enters the first containing cavity 130 from the air inlet 111, flows along the X direction in the first sub-passage 131a, is accelerated by the first fan 141 to change the direction, flows to the second sub-passage 131b connected with the first sub-passage 131a after the change of the direction, flows along the X negative direction in the second sub-passage 131b, and then enters the second passage 132 through the first air vent 121, flows along the X direction in the second passage 132, and is discharged from the air outlet 112 to the first containing cavity 130.

[0094] In an embodiment, referring to FIG. 9, the air inlet 111 and the air outlet 112 are arranged on the positive direction and the negative direction of the X direction of the shell 110 respectively, the air inlet 111 is arranged at one end of the first sub-passage 131a along the X negative direction, and the air outlet 112 is arranged at one end of the second passage 132 along the X direction. The first passage 131 is divided into the first sub-passage 131a and the second sub-passage 131b arranged along the Z direction by the second partition plate 1311, and one end of the first sub-passage 131a along the X direction is connected with one end of the second sub-passage 131b along the X direction. No fan 140 is arranged in the first sub-passage 131a, and two second fans 142 are arranged in the second passage 132 on the side of the second passage 132 along the X direction, and the two second fans 142 can blow air towards the X direction.

[0095] The two second fans 142 are located at one side of the second passage 132 along the X direction, and the second fans 142 are located close to the air outlet 112. The second fans 142 can directly blow the cooling air out of the air outlet 112, and the first accommodating cavity 130 can be in a larger negative pressure state, so as to improve the flow rate of the air in the second passage 132 and improve the cooling capacity. After the air enters the first accommodating cavity 130 from the air inlet 111, the air flows along the X direction in the first sub-passage 131a, and then flows to the second sub-passage 131b communicated with the first sub-passage 131a and flows along the X direction in the second sub-passage 131b, and then enters the second passage 132 through the first vent hole 121, flows along the X direction in the second passage 132, and is discharged from the first accommodating cavity 130 through the air outlet 112.

[0096] In an embodiment, referring to FIG. 10, the air inlet 111 and the air outlet 112 are located at the positive direction and the negative direction of the X direction of the shell 110, respectively. The air inlet 111 is located at one end of the first sub-passage 131a along the negative direction of the X direction, and the air outlet 112 is located at one end of the second passage 132 along the positive direction of the X direction. The first passage 131 is divided into the first sub-passage 131a and the second sub-passage 131b arranged along the Z direction by the second partition plate 1311, and one end of the first sub-passage 131a along the X direction is communicated with one end of the second sub-passage 131b along the X direction.

[0097] A first fan 141 can be arranged in the first sub-passage 131a. The first fan 141 can be horizontally arranged, and the air outlet direction of the first fan 141 can be arranged along the Z direction. The first sub-passage 131a and the second sub-passage 131b are arranged in a stacked manner along the Z direction, the air outlet direction of the first fan 141 is consistent with the distribution direction of the first sub-passage 131a and the second sub-passage 131b, and the fan arranged at the communication corner of the first sub-passage 131a and the second sub-passage 131b blows air along the Z direction. This helps to improve the flow effect of the air from the first sub-passage 131a to the second sub-passage 131b, thereby improving the cooling efficiency.

[0098] The second passage 132 can not be provided with a fan 140. After the air enters the first accommodating cavity 130 from the air inlet 111, the air flows along the X direction in the first sub-passage 131a, and then flows to the second sub-passage 131b communicated with the first sub-passage 131a and flows along the negative direction of the X direction in the second sub-passage 131b, and then enters the second passage 132 through the first vent hole 121, flows along the X direction in the second passage 132, and is discharged from the first accommodating cavity 130 through the air outlet 112.

[0099] In an embodiment, referring to FIG. 11, the air inlet 111 and the air outlet 112 are located on the positive direction and the negative direction of the X direction of the shell 110 respectively, the air inlet 111 is located at one end of the first sub-passage 131a in the X negative direction, and the air outlet 112 is located at one end of the second passage 132 in the X direction. The first passage 131 is divided into the first sub-passage 131a and the second sub-passage 131b arranged in the Z direction by the second partition plate 1311, and one end of the first sub-passage 131a in the X direction and one end of the second sub-passage 131b in the X direction are connected.

[0100] The second partition plate 1311 can be a circuit board, or a circuit board is arranged on the second partition plate 1311, and components are arranged on at least one surface of the circuit board. In the embodiment, components are arranged on one surface of the circuit board facing the Z direction, and components are arranged in the first sub-passage 131a and the second sub-passage 131b. The components in the second sub-passage 131b can be mounted on the second partition plate 1311, and the components in the first sub-passage 131a can be mounted on the Z negative direction side of the second partition plate 1311 or the bottom wall of the Z negative direction side of the first sub-passage 131a. Air can flow in the first sub-passage 131a and the second sub-passage 131b, and the components arranged in the first sub-passage 131a and the second sub-passage 131b can be cooled, so that the space utilization efficiency is improved while meeting the cooling demand.

[0101] A first fan 141 can be arranged in the first sub-passage 131a, and the first fan 141 is located on the X negative direction side of the first sub-passage 131a, and the first fan 141 can send air in the X direction. Two second fans 142 can be arranged in the second passage 132, and the two second fans 142 are located on the X negative direction side of the second passage 132, and the two second fans 142 can send air in the X direction. After the air enters the first containing cavity 130 from the air inlet 111, the air flows in the X direction in the first sub-passage 131a, then flows to the second sub-passage 131b connected with the first sub-passage 131a and flows in the X negative direction in the second sub-passage 131b, and then passes through the first air hole 121 to enter the second passage 132, flows in the X direction in the second passage 132, and is discharged from the first containing cavity 130 through the air outlet 112.

[0102] In an embodiment, referring to FIG. 12, the air inlet 111 and the air outlet 112 are located on the positive direction and the negative direction of the X direction of the shell 110 respectively, the air inlet 111 is located at one end of the first sub-passage 131a in the X negative direction, and the air outlet 112 is located at one end of the second passage 132 in the X direction. The first partition plate 120 forms the third vent hole 122 between the end away from the air inlet 111 and the shell 110. In this embodiment, the end of the first partition plate 120 in the X direction can not abut against the surrounding plate 110a on one side of the shell 110 in the X direction to form the third vent hole 122. It can be understood that in some other possible embodiments, the end of the first partition plate 120 in the X direction can abut against the surrounding plate 110a on one side of the shell 110 in the X direction, a through hole is formed on the end of the first partition plate 120 in the X direction to form the third vent hole 122, and the like.

[0103] The first passage 131 is divided into the first sub-passage 131a and the second sub-passage 131b arranged in the Z direction by the second partition plate 1311, and the third vent hole 122 is connected to one end of the first sub-passage 131a, the second sub-passage 131b and the second passage 132 in the X direction respectively. One end of the first sub-passage 131a in the X direction is connected to one end of the second sub-passage 131b in the X direction.

[0104] A first fan 141 can be arranged in the first sub-passage 131a, and the first fan 141 can be located on one side of the first sub-passage 131a in the X negative direction, and the first fan 141 can send air in the X direction. Two second fans 142 can be arranged in the second passage 132, and the two second fans 142 are located on one side of the second passage 132 in the X negative direction, and the two second fans 142 can send air in the X direction. After the air enters the first containing cavity 130 from the air inlet 111, the air flows in the X direction in the first sub-passage 131a, and after the air reaches one end of the first sub-passage 131a in the X direction, part of the air flows to the second sub-passage 131b connected to the first sub-passage 131a and flows in the X negative direction in the second sub-passage 131b, and then enters the second passage 132 through the first vent hole 121, flows in the X direction in the second passage 132, and is discharged from the first containing cavity 130 through the air outlet 112; the other part of the air directly flows from the third vent hole 122 to one end of the second passage 132 in the X direction and then flows to the air outlet 112 to discharge from the first containing cavity 130. When the heat dissipation demand in the second passage 132 is not high, the air in the first passage 131 after being heated can be partially discharged directly from the air outlet 112, and the heat dissipation air in the first passage 131 does not need to flow through the second passage 132 completely, the first passage 131 can enter more air for heat dissipation, so as to improve the ventilation air volume of the first passage 131 and improve the heat dissipation efficiency of the devices in the first passage 131.

[0105] In an embodiment, referring to FIG. 13, the air inlet 111 and the air outlet 112 are located on the positive direction and the negative direction of the X direction of the shell 110 respectively, the air inlet 111 is located at one end of the first sub-channel 131a in the X negative direction, and the air outlet 112 is located at one end of the second channel 132 in the X direction. The first channel 131 is divided into the first sub-channel 131a and the second sub-channel 131b arranged in the Z direction by the second partition plate 1311, and one end of the first sub-channel 131a in the X direction and one end of the second sub-channel 131b in the X direction are connected. A first fan 141 can be arranged in the first sub-channel 131a, the first fan 141 is located on one side of the first sub-channel 131a in the X negative direction, and the first fan 141 can send air in the X direction.

[0106] The fourth partition plate 160 is arranged in the second channel 132, and two sides of the fourth partition plate 160 in the thickness direction (consistent with the Z direction in FIG. 13) can be parallel to or inclined at a certain angle with respect to two sides of the second partition plate 1311 in the thickness direction. In an embodiment, the fourth partition plate 160 can have the same height as the second partition plate 1311 in the Z direction, or different height. The fourth partition plate 160 divides the second channel 132 into the fifth sub-channel 1323 and the sixth sub-channel 1324 in the Z direction, and the fifth sub-channel 1323 is located on the Z negative side of the sixth sub-channel 1324. One end of the fifth sub-channel 1323 in the X direction and one end of the sixth sub-channel 1324 in the X direction are connected, and both are connected with the air outlet 112.

[0107] The third partition plate 150 can be arranged in the second channel 132, and the third partition plate 150 can be located at one end of the fifth sub-channel 1323 in the X negative direction. The third partition plate 150 can divide the fifth sub-channel 1323 into two spaces in the positive direction and the negative direction of the X direction, and two fourth air vents 1501 can be arranged on the third partition plate 150. Two second fans 142 are arranged in the two fourth air vents 1501 respectively, and the two second fans 142 are located on one side of the fifth sub-channel 1323 in the X negative direction. The two second fans 142 can send air in the X direction.

[0108] One end of the fifth sub-channel 1323 and one end of the sixth sub-channel 1324 in the X negative direction are connected with the first channel 131, and one end of the fifth sub-channel 1323 and one end of the sixth sub-channel 1324 in the X direction are connected, and both are connected with the air outlet 112.

[0109] The wind flows in the first sub-passage 131a in the X direction after entering the first accommodating cavity 130 from the air inlet 111, then flows to the second sub-passage 131b communicated with the first sub-passage 131a and flows in the X reverse direction in the second sub-passage 131b, and then enters the fifth sub-passage 1323 through the first air vent 121. The wind flowing in the X direction in the fifth sub-passage 1323 partly enters the sixth sub-passage 1324 and flows in the X reverse direction in the sixth sub-passage 1324, and the other part of the wind flows to one end of the fifth sub-passage 1323 in the X direction and is discharged from the air outlet 112 out of the first accommodating cavity 130. It should be noted that when the wind flows to one end of the second passage 132 in the X reverse direction, the fourth partition plate 160 divides the second passage into the fifth sub-passage 1323 and the sixth sub-passage 1324 in the Z direction. When the wind flows in the X direction in the fifth sub-passage 1323 for the first time, part of the wind is discharged from the air outlet 112 out of the first accommodating cavity 130 when the wind flows to one end of the fifth sub-passage 1323 in the X direction, and the other part of the wind flows into the sixth sub-passage 1324 from the communication between the fifth sub-passage 1323 and the sixth sub-passage 1324. When the wind flows through the fifth sub-passage 1323 again, the air volume in the fifth sub-passage 1323 can be increased, thereby improving the heat dissipation effect of the wind on the components installed in the second passage 132.

[0110] In an embodiment, referring to FIG. 14, the power conversion device 10 in the embodiment has a structure similar to that of the power conversion device 10 in FIG. 13. The difference is that in the embodiment, the fourth partition plate 160 can be a circuit board, or a circuit board is arranged on the fourth partition plate 160, and components are arranged on at least one surface of the circuit board. In the embodiment, referring to FIG. 14, the circuit board can have components arranged on one surface facing the positive direction of the Z direction, and components are arranged in the fifth sub-passage 1323 and the sixth sub-passage 1324. The components in the sixth sub-passage 1324 can be mounted on the fourth partition plate 160, and the components in the fifth sub-passage 1323 can be mounted on the Z reverse direction side of the fourth partition plate 160 or the bottom wall of the Z reverse direction side of the fifth sub-passage 1323. The wind can flow in the fifth sub-passage 1323 and the sixth sub-passage 1324 to dissipate heat from the components arranged in the fifth sub-passage 1323 and the sixth sub-passage 1324, thereby improving the space utilization efficiency while meeting the heat dissipation requirement.

[0111] In one embodiment, referring to FIG. 15, the power conversion device 10 in this embodiment has a structure similar to that of the power conversion device 10 in FIG. 13. The difference is that in this embodiment, both the second fans 142 are located in the sixth sub-passage 1324 and can be located at the end of the sixth sub-passage 1324 in the X direction. After the air enters the first containing cavity 130 from the air inlet 111, it flows in the X direction in the first sub-passage 131a, then flows to the second sub-passage 131b communicated with the first sub-passage 131a and flows in the X direction in the second sub-passage 131b, and then enters the sixth sub-passage 1324 through the first vent hole 121. Part of the air flowing in the X direction in the sixth sub-passage 1324 enters the fifth sub-passage 1323, flows in the X direction in the fifth sub-passage 1323 and returns to the sixth sub-passage 1324, and the other part of the air can directly flow out of the first containing cavity 130 from the air outlet 112 after flowing to the end of the sixth sub-passage 1324 in the X direction.

[0112] It should be noted that when the air flows to the end of the second passage 132 in the X direction, since the fourth partition plate 160 divides the second passage into the fifth sub-passage 1323 and the sixth sub-passage 1324 in the Z direction, when the air flows in the X direction in the sixth sub-passage 1324 for the first time, part of the air can directly flow out of the first containing cavity 130 from the air outlet 112 when the air flows in the X direction to the end of the sixth sub-passage 1324 in the X direction; the other part of the air can flow into the fifth sub-passage 1323 from the communication between the fifth sub-passage 1323 and the sixth sub-passage 1324, and this part of the air can increase the air volume in the sixth sub-passage 1324 when it returns to the sixth sub-passage 1324, thereby improving the heat dissipation effect of the air on the components installed in the second passage 132.

[0113] In some possible embodiments, referring to FIG. 16, the power conversion device 10 includes a housing 110 and a first partition plate 120, and the inner wall surface of the housing 110 surrounds to form a first containing cavity 130. The housing 110 is provided with an air inlet 111 and an air outlet 112, and the air inlet 111 and the air outlet 112 can be located on the same side of the first containing cavity 130 in the Z direction.

[0114] The first partition plate 120 is located inside the first accommodating cavity 130, and both ends of the first partition plate 120 along the X direction abut against the inner wall of the shell 110. The first partition plate 120 divides the first accommodating cavity 130 in the Y direction into a first channel 131 and a second channel 132. Both the first channel 131 and the second channel 132 are provided with components, wherein the first channel 131 can be provided with components such as capacitors and inductors with lower power and power density, and the components in the first channel 131 have lower heat generation. The second channel 132 can be provided with components such as electronic components with higher power and power density, and the components in the second channel 132 have higher heat generation. The air inlet 111 can be located at one end of the first channel 131 and communicate with the first channel 131, and the air outlet 112 can be located at one end of the second channel 132 and communicate with the second channel 132.

[0115] In the embodiment, the air inlet 111 and the air outlet 112 can be located at one end of the first channel 131 along the X direction. It should be noted that in other possible embodiments, the positions of the air inlet 111 and the air outlet 112 can be the same as or different from the embodiment, for example, the air inlet 111 and the air outlet 112 can be located at one end of the first channel 131 along the X direction.

[0116] The first partition plate 120 and the shell 110 have a first ventilation hole 121, which can be located at one end of the first partition plate 120 along the X direction. A notch is provided at one end of the first partition plate 120 along the X direction to form the first ventilation hole 121. The first ventilation hole 121 communicates the first channel 131 and the second channel 132. The first channel 131 and the second channel 132 can both be air ducts, and the first channel 131 and the second channel 132 are both used for circulating air to dissipate heat of the components installed in the first channel 131 and the second channel 132.

[0117] The first channel 131 can be provided with a first fan 141, which can be located at any position in the first channel 131. The number of the first fan 141 can be at least one. In the embodiment, the first fan 141 can be located at one end of the first channel 131 along the X direction. The first fan 141 sends air to the first channel 131 in the X direction, and the number of the first fan 141 can be one.

[0118] The second channel 132 can be provided with a second fan 142, which can be located at any position in the second channel 132, and the number of the second fan 142 can be at least one. In the embodiment, the second channel 132 is provided with a third partition plate 150, the two sides of the third partition plate 150 along the thickness direction can be perpendicular or inclined to the two sides of the first partition plate 120 along the thickness direction, the third partition plate 150 can divide the second channel 132 into a third sub-channel 1321 and a fourth sub-channel 1322 along the X direction, the air outlet 112 is arranged in the fourth sub-channel 1322, and the third sub-channel 1321 is located on the side of the fourth sub-channel 1322 away from the air outlet 112, and the third sub-channel 1321 and the air outlet 112 are arranged opposite at both ends of the fourth sub-channel 1322 along the extension direction of the fourth sub-channel 1322.

[0119] In the embodiment, the second channel 132 is the third sub-channel 1321 on the side of the third partition plate 150 along the X direction, and the second channel 132 is the fourth sub-channel 1322 on the side of the third partition plate 150 along the X direction. The first channel 131, the third sub-channel 1321 and the fourth sub-channel 1322 are sequentially communicated, and the third partition plate 150 can be provided with a fourth vent hole 1501, the fourth vent hole 1501 penetrates the third partition plate 150 along the thickness direction of the third partition plate 150, the fourth vent hole 1501 communicates the third sub-channel 1321 and the fourth sub-channel 1322, the fan in the second channel 132 is arranged in the fourth vent hole 1501, the number of the fourth vent hole 1501 is at least one, and the second fan 142 is installed in the fourth vent hole 1501. The second fan 142 can be located at one end of the second channel 132 along the X direction, and the number of the second fan 142 can be two. The second fan 142 sends air into the second channel 132 towards the X direction.

[0120] In an embodiment, the total air volume of the first fan 141 is less than the total air volume of the second fan 142. The total air volume of the first fan 141 being less than the total air volume of the second fan 142 can include various cases, for example, the air speed of the first fan 141 and the second fan 142 is the same, and the number of the first fan 141 is less than the number of the second fan 142; for another example, the number of the first fan 141 and the number of the second fan 142 is the same, and the air speed of the first fan 141 is less than the air speed of the second fan 142; for another example, the air speed and the number of the first fan 141 are both less than the air speed and the number of the second fan 142, and the like.

[0121] The air inlet 111 and the air outlet 112 can be located at one end of the first channel 131 in the X direction, and the air in the first accommodating cavity 130 is discharged from the air outlet 112. Referring to FIG. 16, the air sent by the air inlet 111 and the first fan 141 is transmitted in the first channel 131 in the direction of the solid arrow in FIG. 16, specifically, the air sent by the air inlet 111 and the first fan 141 flows in the X direction in the first channel 131, and is transmitted to the second fan 142 through the first air hole 121, and flows in the X direction in the second channel 132 through the second fan 142, and finally flows out from the air outlet 112, so as to realize heat dissipation of the components installed in the first channel 131 and the second channel 132. In this application, the air inlet 111, the first channel 131, the first air hole 121, the second channel 132 and the air outlet 112 are sequentially communicated to form a series air duct, and the air passes through the first channel 131 with low heat dissipation requirement and enters the second channel 132 through the first air hole 121, which not only improves the total air volume in the second channel 132 and improves the heat dissipation capacity, but also enables the air that exchanges heat with the first channel 131 with low heat dissipation requirement to continue to dissipate heat for the components in the second channel 132, realizes multi-stage effective use of the air, and improves the heat dissipation efficiency. Moreover, this application also provides different air volume according to different heat dissipation requirements of the components in the first channel 131 and the second channel 132, which reduces the heat dissipation cost.

[0122] In one embodiment, referring to FIG. 17, the air inlet 111 and the air outlet 112 can be located on the same side of the shell 110 in the X direction. A first fan 141 can be arranged in the first channel 131, and the first fan 141 can be located on one side of the first channel 131 in the X direction. In one embodiment, the first fan 141 can cover the air inlet opening of the first channel 131 on the side in the X direction, and the first fan 141 can send air in the X direction.

[0123] The second channel 132 can not be provided with a fan 140, and the air entering the first accommodating cavity 130 from the air inlet 111 can flow in the X direction in the first channel 131, and after turning, it enters the second channel 132 through the first air hole 121, flows in the X direction in the second channel 132, and is discharged from the first accommodating cavity 130 through the air outlet 112.

[0124] In an embodiment, referring to FIG. 18, the air inlet 111 and the air outlet 112 can be located on the same side of the housing 110 along the X direction. A first fan 141 can be arranged in the first passage 131, and the first fan 141 can be located on one side of the first passage 131 along the X direction. In an embodiment, the first fan 141 can cover the air outlet of the first passage 131 on the side along the X direction, and the first fan 141 can blow air towards the X direction. Arranging the fan at the air direction turning corner can improve the turning speed of the air, so as to improve the flow rate of the air in the first containing cavity 130.

[0125] The second passage 132 can not be provided with the fan 140, and after the air enters the first containing cavity 130 from the air inlet 111, the air can flow along the X direction in the first passage 131, turn and pass through the first air hole 121 to enter the second passage 132, and then flow along the X direction in the second passage 132 to the air outlet 112 to discharge the first containing cavity 130.

[0126] In an embodiment, referring to FIG. 19, the air inlet 111 and the air outlet 112 can be located on the same side of the housing 110 along the X direction, and the first passage 131 can not be provided with the first fan 141. The second passage 132 can be provided with a second fan 142, and the number of the second fan 142 can be two. The two second fans 142 are connected in parallel in the second passage 132, and the second fan 142 can be located on one side of the second passage 132 along the X direction. In an embodiment, the first fan 141 can blow air towards the X direction, and the second fan 142 can be arranged at the air direction turning corner where the first passage 131 communicates with the second passage 132, so as to improve the turning speed of the air, and improve the flow rate of the air in the first containing cavity 130.

[0127] After the air enters the first containing cavity 130 from the air inlet 111, the air can flow along the X direction in the first passage 131, turn and pass through the first air hole 121 to enter the second passage 132, and then flow along the X direction in the second passage 132 to the air outlet 112 to discharge the first containing cavity 130.

[0128] In an embodiment, referring to FIG. 20, the air inlet 111 and the air outlet 112 can be located on the same side of the housing 110 along the X direction, and the first passage 131 can not be provided with the first fan 141. The second passage 132 can be provided with the second fan 142, and the number of the second fan 142 can be two. The two second fans 142 are connected in parallel in the second passage 132, and the second fan 142 can be located on one side of the second passage 132 along the X direction. In an embodiment, the second fan 142 can blow air towards the X direction.

[0129] The air from the air inlet 111 enters the first accommodating cavity 130 and flows in the X direction in the first channel 131, turns and enters the second channel 132 through the first air vent 121, flows in the X reverse direction in the second channel 132, and is discharged from the first accommodating cavity 130 through the air outlet 112.

[0130] In an embodiment, referring to FIG. 21, the air inlet 111 and the air outlet 112 can be located on the same side of the shell 110 in the X reverse direction. A first fan 141 can be arranged in the first channel 131, and the first fan 141 can be located on one side of the first channel 131 in the X reverse direction. In an embodiment, the first fan 141 can cover the air inlet opening on the side of the first channel 131 in the X reverse direction, and the first fan 141 can blow air in the X direction.

[0131] A second fan 142 can be arranged in the second channel 132, and the number of the second fan 142 can be two. The two second fans 142 are connected in parallel in the second channel 132, and the second fan 142 can be located on one side of the second channel 132 in the X direction. In an embodiment, the second fan 142 can blow air in the X reverse direction, and the second fan 142 is arranged at the air direction turning corner where the first channel 131 communicates with the second channel 132. In combination with the first fan 141 blowing air into the first accommodating cavity 130 at the air inlet 111, the turning speed of the air can be improved, so as to improve the flow rate of the air in the first accommodating cavity 130.

[0132] The air from the air inlet 111 enters the first accommodating cavity 130 and flows in the X direction in the first channel 131, turns and enters the second channel 132 through the first air vent 121, flows in the X reverse direction in the second channel 132, and is discharged from the first accommodating cavity 130 through the air outlet 112.

[0133] In an embodiment, referring to FIG. 22, the air inlet 111 and the air outlet 112 can be located on the same side of the shell 110 in the X reverse direction. A first fan 141 can be arranged in the first channel 131, and the first fan 141 can be located on one side of the first channel 131 in the X reverse direction. In an embodiment, the first fan 141 can cover the air inlet opening on the side of the first channel 131 in the X reverse direction, and the first fan 141 can blow air in the X direction.

[0134] The second channel 132 can be provided with second fans 142, the number of which can be two. The two second fans 142 are connected in parallel in the second channel 132, and the second fans 142 can be located on one side of the second channel 132 along the X direction. In an embodiment, the second fans 142 can blow air in the X reverse direction. The second fans 142 are provided at the wind direction turning corner where the first channel 131 communicates with the second channel 132, and in combination with the first fans 141 blowing air into the first containing cavity 130 at the air inlet 111, the turning speed of the air can be increased to improve the flow rate of the air in the first containing cavity 130.

[0135] The second channel 132 is provided with a fourth partition plate 160, and the two sides of the fourth partition plate 160 along the thickness direction (consistent with the Z direction in FIG. 22) can be parallel to the two sides of the second partition plate 1311 along the thickness direction, or be inclined at an angle. The fourth partition plate 160 divides the second channel 132 into a fifth sub-channel 1323 and a sixth sub-channel 1324 along the Z direction, and the fifth sub-channel 1323 is located on the Z reverse direction side of the sixth sub-channel 1324. The fifth sub-channel 1323 communicates with the sixth sub-channel 1324 at one end along the X direction, and both communicate with the air outlet 112.

[0136] The second channel 132 can be provided with a third partition plate 150, which can be located at one end of the fifth sub-channel 1323 along the X direction. The third partition plate 150 can divide the fifth sub-channel 1323 into two spaces along the positive direction and the reverse direction of the X direction. The third partition plate 150 can be provided with two fourth air vents 1501, and the two fourth air vents 1501 are respectively used to install two second fans 142. The two second fans 142 are located on one side of the fifth sub-channel 1323 along the X direction, and the two second fans 142 can blow air in the X reverse direction.

[0137] The fifth sub-channel 1323 and the sixth sub-channel 1324 communicate with the first channel 131 at one end along the X direction; the fifth sub-channel 1323 and the sixth sub-channel 1324 communicate with each other at one end along the X reverse direction, and both communicate with the air outlet 112.

[0138] The wind flows in the first passage 131 in the X direction after entering the first accommodating cavity 130 from the air inlet 111, and then enters the fifth sub-passage 1323 through the first air vent 121. Part of the wind flowing in the fifth sub-passage 1323 in the X reverse direction enters the sixth sub-passage 1324, and flows in the X direction in the sixth sub-passage 1324; the other part of the wind flows out of the first accommodating cavity 130 from the air outlet 112 after flowing to one end of the fifth sub-passage 1323 in the X reverse direction. It should be noted that when the wind flows to one end of the second passage 132 in the X direction, the fourth partition plate 160 divides the second passage 132 into the fifth sub-passage 1323 and the sixth sub-passage 1324 in the Z direction. When the wind flows through the fifth sub-passage 1323 for the first time, part of the wind flows out of the first accommodating cavity 130 from the air outlet 112 when the wind flows to one end of the fifth sub-passage 1323 in the X reverse direction. The other part of the wind flows into the sixth sub-passage 1324 from the communication between the fifth sub-passage 1323 and the sixth sub-passage 1324. When the wind flows through the fifth sub-passage 1323 again, the air volume in the fifth sub-passage 1323 can be increased, thereby improving the heat dissipation effect of the wind on the components installed in the second passage 132.

[0139] In an embodiment, referring to FIG. 23, the power conversion device 10 in the embodiment has a structure similar to that of the power conversion device 10 in FIG. 22. The difference is that in the embodiment, the fourth partition plate 160 can be a circuit board, or a circuit board is arranged on the fourth partition plate 160, and at least one surface of the circuit board is provided with components. In the embodiment, referring to FIG. 23, the circuit board can be provided with components on a surface facing the positive direction of the Z direction, and the fifth sub-passage 1323 and the sixth sub-passage 1324 are both provided with components. The components in the sixth sub-passage 1324 can be mounted on the fourth partition plate 160, and the components in the fifth sub-passage 1323 can be mounted on the Z reverse direction side of the fourth partition plate 160 or the bottom wall of the Z reverse direction side of the fifth sub-passage 1323. The wind can flow in the fifth sub-passage 1323 and the sixth sub-passage 1324 to dissipate heat from the components arranged in the fifth sub-passage 1323 and the sixth sub-passage 1324, thereby improving the space utilization efficiency while meeting the heat dissipation demand.

[0140] In an embodiment, referring to FIG. 24, the power conversion device 10 in the embodiment has a structure similar to that of the power conversion device 10 in FIG. 22. The difference is that in the embodiment, both the second fans 142 are located in the sixth sub-passage 1324 and can be located at one end of the sixth sub-passage 1324 in the X direction. After the air enters the first containing cavity 130 from the air inlet 111, the air flows in the X direction in the first passage 131, and then enters the sixth sub-passage 1324 through the first air vent 121. Part of the air flowing in the X direction in the sixth sub-passage 1324 is bent in the Z direction and enters the fifth sub-passage 1323, flows in the X direction in the fifth sub-passage 1323, and returns to the sixth sub-passage 1324; the other part of the air can directly flow out of the first containing cavity 130 from the air outlet 112 after flowing to one end of the sixth sub-passage 1324 in the X direction.

[0141] It should be noted that when the air flows to one end of the second passage 132 in the X direction, because the fourth partition plate 160 divides the second passage into the fifth sub-passage 1323 and the sixth sub-passage 1324 in the Z direction, when the air flows in the sixth sub-passage 1324 for the first time, part of the air can directly flow out of the first containing cavity 130 from the air outlet 112 after flowing in the X direction in the sixth sub-passage 1324 to one end of the sixth sub-passage 1324 in the X direction; the other part of the air can flow into the fifth sub-passage 1323 from the communication between the fifth sub-passage 1323 and the sixth sub-passage 1324, and the air can increase the air volume in the sixth sub-passage 1324 when returning to the sixth sub-passage 1324, thereby improving the heat dissipation effect of the air on the components installed in the second passage 132.

[0142] In some possible embodiments, referring to FIG. 25, the shell 110 has a second containing cavity 170 on the Z direction side, and the second containing cavity 170 can be located on the Z direction side of the first containing cavity 130. The first containing cavity 130 and the second containing cavity 170 can be separated by a fifth partition plate 172 extending along the XY plane to separate the containing cavities in the shell 110 into the first containing cavity 130 and the second containing cavity 170.

[0143] In an embodiment, the air inlet 111 and the air outlet 112 of the first containing cavity 130 can be located on the fifth partition plate 172, and the air inlet 111 and the air outlet 112 can be in communication with the second containing cavity 170. The second containing cavity 170 can be an air duct, and a third fan 173 can be provided on the Y direction side of the second containing cavity 170, and the number of the third fan 173 can be at least one, and four third fans 173 are taken as an example in the embodiment.

[0144] The third fan 173 can blow air into the second accommodating cavity 170. The second accommodating cavity 170 can be provided with a heat exchanger 171, which can have an internal circulation channel, and the circulation channel is connected with the air inlet 111 and the air outlet 112 respectively. The hot air discharged from the air outlet 112 can enter the internal channel of the heat exchanger 171, exchange heat with the external space through the heat exchanger 171, and the cooled gas can return to the first accommodating cavity 130 from the air inlet 111. In the embodiment, the internal channel of the heat exchanger 171 is in communication with the first accommodating cavity 130, and the first accommodating cavity 130 can be a relatively sealed cavity to protect the devices installed in the cavity.

[0145] In an embodiment, FIG. 25 only illustrates a structure of the second accommodating cavity 170 corresponding to FIG. 3a. The air inlet 111 and the air outlet 112 can be located on the two sides of the first accommodating cavity 130 in the X direction and the X reverse direction, and the heat exchanger 171 can span in the second accommodating cavity 170 and extend along the X direction, which is perpendicular to the blowing direction (see the four arrow lines in FIG. 25) in the Y direction, so that the heat exchanger 171 has a larger heat exchange area, improves the heat dissipation of the high-temperature gas in the heat exchanger 171, and improves the heat dissipation efficiency of the devices in the first accommodating cavity 130.

[0146] The application also provides a power storage device, which comprises the power conversion device 10 provided by any of the above embodiments, and can further comprise a photovoltaic panel 21, an alternating current bus box 22 and a string inverter 25. The string inverter 25 can be the power conversion device 10 described in any of the above embodiments, and is connected between the photovoltaic panel 21 and the alternating current bus box 22. The string inverter can convert the variable direct current voltage of the photovoltaic panel 21 into a commercial frequency alternating current, and transmit it to the alternating current bus box 22, and then transmit it to the power grid 24 through the transformer 23, so as to realize the conversion of light energy into usable electric energy. In an embodiment, the converted alternating current can also be fed back to the commercial power transmission system. The string inverter 25 is one of the important system balances (BOS) in the photovoltaic array system, and can be used with general alternating current power supply equipment.

[0147] In an embodiment, the string inverter, the alternating current bus box 22, the transformer 23 and the power grid 24 are connected in series, and the string inverter 25, the alternating current bus box 22 and the transformer 23 can be connected through alternating current cables.

[0148] In some possible embodiments, referring to FIG. 27, the power conversion device 10 can also be used for power conversion of electric energy to charge and discharge a battery. The battery is connected with the power conversion device 10.

[0149] The energy storage device can be an energy storage cabinet, the energy storage converter (PCS), the direct current converter (DC-DC) and the charging module can be independent devices or can be integrated in the energy storage cabinet and the charging pile, the energy storage cabinet can be provided with the energy storage converter (PCS) and the direct current converter (DC-DC), and the charging pile can be provided with the charging module.

[0150] The energy storage device can be an energy storage cabinet, the energy storage converter (PCS), the direct current converter (DC-DC) and the charging module can be independent devices or can be integrated in the energy storage cabinet and the charging pile, the energy storage cabinet can be provided with the energy storage converter (PCS) and the direct current converter (DC-DC), and the charging pile can be provided with the charging module.

[0151] The energy storage device can be an energy storage cabinet, the energy storage converter (PCS), the direct current converter (DC-DC) and the charging module can be independent devices or can be integrated in the energy storage cabinet and the charging pile, the energy storage cabinet can be provided with the energy storage converter (PCS) and the direct current converter (DC-DC), and the charging pile can be provided with the charging module.

[0152] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

[0153] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A power conversion device, characterized in that: The device comprises a shell and a first partition, wherein the shell has a first accommodating cavity, and the first partition divides the first accommodating cavity into a first channel and a second channel; a first component is arranged in the first channel, and a second component is arranged in the second channel; A first ventilation hole is provided on the first partition, and the first ventilation hole connects the first channel and the second channel. An air inlet and an air outlet are provided on the shell, and the air inlet, the first channel, the first ventilation hole, the second channel and the air outlet are connected in sequence to form a ventilation channel.

2. The power conversion device according to claim 1, characterized in that A second partition is provided in the first channel, the second partition divides the first channel into a first sub-channel and a second sub-channel, a second ventilation hole is provided on the second partition, the second ventilation hole connects the first sub-channel and the second sub-channel, the first ventilation hole connects the second sub-channel and the second channel, the first component is provided in at least one of the first sub-channel and the second sub-channel, the first ventilation hole and the air inlet are located on the same side in the extension direction of the first partition, and the air inlet and the air outlet are located on both sides in the extension direction of the first partition; The air inlet, the first sub-channel, the second ventilation hole, the second sub-channel, the first ventilation hole, the second channel and the air outlet are connected in sequence.

3. The power conversion device according to claim 2, characterized in that: The second partition is a circuit board, or a circuit board is provided on the second partition.

4. The power conversion device according to claim 2 or 3, characterized in that: A third ventilation hole is provided at one end of the first partition plate in the extension direction away from the air inlet, and at least one of the first sub-channel and the second sub-channel is communicated with the second channel through the third ventilation hole.

5. The power conversion device according to claim 1, characterized in that: The first ventilation hole is located on a side of the first partition plate in an extending direction away from the air inlet, and the air inlet and the air outlet are located on the same side of the first partition plate in an extending direction.

6. The power conversion device according to any one of claims 1 to 5, characterized in that: A first fan is provided in the first channel, and a second fan is provided in the second channel. The total air volume of the first fan is smaller than the total air volume of the second fan.

7. The power conversion device according to any one of claims 1 to 6, characterized in that: A third partition is provided in the second channel, and the third partition divides the second channel into a third sub-channel and a fourth sub-channel. The air outlet is provided in the fourth sub-channel, and the third sub-channel is located on the side of the fourth sub-channel away from the air outlet. A fourth ventilation hole is provided on the third partition, and the fourth ventilation hole connects the third sub-channel and the fourth sub-channel. The fan in the second channel is provided in the fourth ventilation hole.

8. The power conversion device according to any one of claims 1 to 7, characterized in that: A fourth partition is provided in the second channel, the fourth partition divides the second channel into a fifth sub-channel and a sixth sub-channel, and the second component is provided in the fifth sub-channel; The inlet ends of the fifth sub-channel and the sixth sub-channel are connected, the inlet ends of the fifth sub-channel and the sixth sub-channel are both connected to the first channel, the outflow ends of the fifth sub-channel and the sixth sub-channel are connected, and the outflow ends of the fifth sub-channel and the sixth sub-channel are both connected to the air outlet.

9. The power conversion device according to claim 8, characterized in that: A fan is provided in at least one of the fifth sub-channel and the sixth sub-channel.

10. The power conversion device according to claim 8, characterized in that: Fans are respectively provided in the fifth sub-channel and the sixth sub-channel, and the wind direction of the fan in the fifth sub-channel is opposite to the wind direction of the fan in the sixth sub-channel.

11. The power conversion device according to any one of claims 8 to 10, characterized in that: The fourth partition is a circuit board, or a circuit board is provided on the fourth partition.

12. The power conversion device according to any one of claims 1 to 11, characterized in that: A second accommodating chamber is further provided in the shell, and the second accommodating chamber is separated from the first accommodating chamber by a fifth partition plate; A heat exchanger is provided in the second accommodating chamber. The heat exchanger has an internal circulation channel, which is connected to the air inlet and the air outlet respectively. The heat exchanger is used to cool the medium discharged from the air outlet to provide cooling medium to the air inlet.

13. An energy storage device, characterized in that: The invention comprises a battery and the power conversion device according to any one of claims 1 to 12, wherein the battery is connected to the power conversion device, and the power conversion device is used for power conversion of electric energy to charge and discharge the battery.

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